+++ /dev/null
-Lua License
------------
-
-Lua is licensed under the terms of the MIT license reproduced below.
-This means that Lua is free software and can be used for both academic
-and commercial purposes at absolutely no cost.
-
-For details and rationale, see http://www.lua.org/license.html .
-
-===============================================================================
-
-Copyright (C) 2003-2004 Tecgraf, PUC-Rio.
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-
-===============================================================================
-
-(end of COPYRIGHT)
+++ /dev/null
-diff -r lua-5.0/COPYRIGHT lua-5.0.2/COPYRIGHT
-12c12
-< Copyright (C) 2003 Tecgraf, PUC-Rio.
----
-> Copyright (C) 2003-2004 Tecgraf, PUC-Rio.
-diff -r lua-5.0/Makefile lua-5.0.2/Makefile
-98a99,101
-> newer:
-> @find . -newer MANIFEST -type f
->
-diff -r lua-5.0/doc/readme.html lua-5.0.2/doc/readme.html
-16c16
-< <LI><A HREF="manual.html">Reference manual</A>
----
-> <LI><A HREF="contents.html">Reference manual</A>
-31c31
-< Tue Apr 1 14:35:18 EST 2003
----
-> Thu Mar 11 23:08:56 BRT 2004
-diff -r lua-5.0/include/lua.h lua-5.0.2/include/lua.h
-2c2
-< ** $Id: lua.h,v 1.175 2003/03/18 12:31:39 roberto Exp $
----
-> ** $Id: lua.h,v 1.175b 2003/03/18 12:31:39 roberto Exp $
-17,18c17,18
-< #define LUA_VERSION "Lua 5.0"
-< #define LUA_COPYRIGHT "Copyright (C) 1994-2003 Tecgraf, PUC-Rio"
----
-> #define LUA_VERSION "Lua 5.0.2"
-> #define LUA_COPYRIGHT "Copyright (C) 1994-2004 Tecgraf, PUC-Rio"
-368c368
-< * Copyright (C) 1994-2003 Tecgraf, PUC-Rio. All rights reserved.
----
-> * Copyright (C) 1994-2004 Tecgraf, PUC-Rio. All rights reserved.
-diff -r lua-5.0/src/ldo.c lua-5.0.2/src/ldo.c
-2c2
-< ** $Id: ldo.c,v 1.217 2003/04/03 13:35:34 roberto Exp $
----
-> ** $Id: ldo.c,v 1.217a 2003/04/03 13:35:34 roberto Exp $
-325,326c325
-< if (nargs >= L->top - L->base)
-< luaG_runerror(L, "cannot resume dead coroutine");
----
-> lua_assert(nargs < L->top - L->base);
-329c328,329
-< else if (ci->state & CI_YIELD) { /* inside a yield? */
----
-> else { /* inside a yield */
-> lua_assert(ci->state & CI_YIELD);
-344,345d343
-< else
-< luaG_runerror(L, "cannot resume non-suspended coroutine");
-351a350,358
-> static int resume_error (lua_State *L, const char *msg) {
-> L->top = L->ci->base;
-> setsvalue2s(L->top, luaS_new(L, msg));
-> incr_top(L);
-> lua_unlock(L);
-> return LUA_ERRRUN;
-> }
->
->
-355a363,368
-> if (L->ci == L->base_ci) {
-> if (nargs >= L->top - L->base)
-> return resume_error(L, "cannot resume dead coroutine");
-> }
-> else if (!(L->ci->state & CI_YIELD)) /* not inside a yield? */
-> return resume_error(L, "cannot resume non-suspended coroutine");
-diff -r lua-5.0/src/lgc.c lua-5.0.2/src/lgc.c
-2c2
-< ** $Id: lgc.c,v 1.171 2003/04/03 13:35:34 roberto Exp $
----
-> ** $Id: lgc.c,v 1.171a 2003/04/03 13:35:34 roberto Exp $
-113c113,114
-< void luaC_separateudata (lua_State *L) {
----
-> size_t luaC_separateudata (lua_State *L) {
-> size_t deadmem = 0;
-127a129
-> deadmem += sizeudata(gcotou(curr)->uv.len);
-136a139
-> return deadmem;
-247c250
-< if (!(ci->state & CI_C) && lim < ci->top)
----
-> if (lim < ci->top)
-390c393
-< static void checkSizes (lua_State *L) {
----
-> static void checkSizes (lua_State *L, size_t deadmem) {
-400c403
-< G(L)->GCthreshold = 2*G(L)->nblocks; /* new threshold */
----
-> G(L)->GCthreshold = 2*G(L)->nblocks - deadmem; /* new threshold */
-454c457,458
-< static void mark (lua_State *L) {
----
-> static size_t mark (lua_State *L) {
-> size_t deadmem;
-467c471
-< luaC_separateudata(L); /* separate userdata to be preserved */
----
-> deadmem = luaC_separateudata(L); /* separate userdata to be preserved */
-475a480
-> return deadmem;
-480c485
-< mark(L);
----
-> size_t deadmem = mark(L);
-482c487
-< checkSizes(L);
----
-> checkSizes(L, deadmem);
-diff -r lua-5.0/src/lgc.h lua-5.0.2/src/lgc.h
-2c2
-< ** $Id: lgc.h,v 1.19 2003/02/28 19:45:15 roberto Exp $
----
-> ** $Id: lgc.h,v 1.19a 2003/02/28 19:45:15 roberto Exp $
-18c18
-< void luaC_separateudata (lua_State *L);
----
-> size_t luaC_separateudata (lua_State *L);
-diff -r lua-5.0/src/lib/lbaselib.c lua-5.0.2/src/lib/lbaselib.c
-2c2
-< ** $Id: lbaselib.c,v 1.130 2003/04/03 13:35:34 roberto Exp $
----
-> ** $Id: lbaselib.c,v 1.130b 2003/04/03 13:35:34 roberto Exp $
-276a277
-> int n = lua_gettop(L);
-280c281
-< return lua_gettop(L) - 1;
----
-> return lua_gettop(L) - n;
-327c328
-< char buff[64];
----
-> char buff[128];
-diff -r lua-5.0/src/lib/liolib.c lua-5.0.2/src/lib/liolib.c
-2c2
-< ** $Id: liolib.c,v 2.39 2003/03/19 21:16:12 roberto Exp $
----
-> ** $Id: liolib.c,v 2.39a 2003/03/19 21:16:12 roberto Exp $
-161c161
-< if (lua_isnone(L, 1)) {
----
-> if (lua_isnone(L, 1) && lua_type(L, lua_upvalueindex(1)) == LUA_TTABLE) {
-178c178
-< char buff[32];
----
-> char buff[128];
-diff -r lua-5.0/src/lparser.c lua-5.0.2/src/lparser.c
-2c2
-< ** $Id: lparser.c,v 1.208 2003/04/03 13:35:34 roberto Exp $
----
-> ** $Id: lparser.c,v 1.208a 2003/04/03 13:35:34 roberto Exp $
-1143a1144
-> FuncState *fs = ls->fs;
-1145c1146,1147
-< init_exp(&v, VLOCAL, ls->fs->freereg++);
----
-> init_exp(&v, VLOCAL, fs->freereg);
-> luaK_reserveregs(fs, 1);
-1148c1150,1152
-< luaK_storevar(ls->fs, &v, &b);
----
-> luaK_storevar(fs, &v, &b);
-> /* debug information will only see the variable after this point! */
-> getlocvar(fs, fs->nactvar - 1).startpc = fs->pc;
-diff -r lua-5.0/src/luac/Makefile lua-5.0.2/src/luac/Makefile
-16c16
-< $(CC) -o $@ $(MYLDFLAGS) $(OBJS) -L$(LIB) -llua -llualib $(EXTRA_LIBS)
----
-> $(CC) -o $@ $(MYLDFLAGS) $(OBJS) -L$(LIB) -llua -llualib $(EXTRA_LIBS) $(DLLIB)
-diff -r lua-5.0/src/luac/luac.c lua-5.0.2/src/luac/luac.c
-2c2
-< ** $Id: luac.c,v 1.44 2003/04/07 20:34:20 lhf Exp $
----
-> ** $Id: luac.c,v 1.44a 2003/04/07 20:34:20 lhf Exp $
-184a185
-> lua_lock(L);
-185a187
-> lua_unlock(L);
-diff -r lua-5.0/src/lvm.c lua-5.0.2/src/lvm.c
-2c2
-< ** $Id: lvm.c,v 1.284 2003/04/03 13:35:34 roberto Exp $
----
-> ** $Id: lvm.c,v 1.284b 2003/04/03 13:35:34 roberto Exp $
-69c69
-< if (mask > LUA_MASKLINE) { /* instruction-hook set? */
----
-> if (mask & LUA_MASKCOUNT) { /* instruction-hook set? */
-402,403c402,403
-< L->ci->u.l.pc = &pc;
-< if (L->hookmask & LUA_MASKCALL)
----
-> if (L->hookmask & LUA_MASKCALL) {
-> L->ci->u.l.pc = &pc;
-404a405
-> }
-405a407
-> L->ci->u.l.pc = &pc;
-676,678c678
-< lua_assert(ci->u.l.pc == &pc &&
-< ttisfunction(ci->base - 1) &&
-< (ci->state & CI_SAVEDPC));
----
-> lua_assert(ttisfunction(ci->base - 1) && (ci->state & CI_SAVEDPC));
-779a780
->
-diff -r lua-5.0/test/luac.lua lua-5.0.2/test/luac.lua
-4,6c4,6
-< assert(arg[1]~=nil,"usage: lua luac.lua file.lua")
-< f=assert(io.open("luac.out","w"))
-< f:write(string.dump(loadfile(arg[1])))
----
-> assert(arg[1]~=nil and arg[2]==nil,"usage: lua luac.lua file.lua")
-> f=assert(io.open("luac.out","wb"))
-> f:write(string.dump(assert(loadfile(arg[1]))))
-diff -r lua-5.0/test/table.lua lua-5.0.2/test/table.lua
-8c8
-< local _,_,a,b=string.find(l,'"?(%w+)"?%s*(.*)$')
----
-> local _,_,a,b=string.find(l,'"?([_%w]+)"?%s*(.*)$')
+++ /dev/null
-This is Lua 5.0.
-
-* Changes from version 4.0 to 5.0
- -------------------------------
- Language:
- + lexical scoping.
- + Lua coroutines.
- + standard libraries now packaged in tables.
- + tags replaced by metatables and tag methods replaced by metamethods,
- stored in metatables.
- + proper tail calls.
- + each function can have its own global table, which can be shared.
- + new __newindex metamethod, called when we insert a new key into a table.
- + new block comments: --[[ ... ]].
- + new generic for.
- + new weak tables.
- + new boolean type.
- + new syntax "local function".
- + (f()) returns the first value returned by f.
- + {f()} fills a table with all values returned by f.
- + \n ignored in [[\n .
- + fixed and-or priorities.
- + more general syntax for function definition (e.g. function a.x.y:f()...end).
- + more general syntax for function calls (e.g. (print or write)(9)).
- + new functions (time/date, tmpfile, unpack, require, load*, etc.).
- API:
- + chunks are loaded by using lua_load; new luaL_loadfile and luaL_loadbuffer.
- + introduced lightweight userdata, a simple "void*" without a metatable.
- + new error handling protocol: the core no longer prints error messages;
- all errors are reported to the caller on the stack.
- + new lua_atpanic for host cleanup.
- + new, signal-safe, hook scheme.
- Implementation:
- + new license: MIT.
- + new, faster, register-based virtual machine.
- + support for external multithreading and coroutines.
- + new and consistent error message format.
- + the core no longer needs "stdio.h" for anything (except for a single
- use of sprintf to convert numbers to strings).
- + lua.c now runs the environment variable LUA_INIT, if present. It can
- be "@filename", to run a file, or the chunk itself.
- + support for user extensions in lua.c.
- sample implementation given for command line editing.
- + new dynamic loading library, active by default on several platforms.
- + safe garbage-collector metamethods.
- + precompiled bytecodes checked for integrity (secure binary dostring).
- + strings are fully aligned.
- + position capture in string.find.
- + read('*l') can read lines with embedded zeros.
-
-* Changes from version 3.2 to 4.0
- -------------------------------
- Language:
- + new "break" and "for" statements (both numerical and for tables).
- + uniform treatment of globals: globals are now stored in a Lua table.
- + improved error messages.
- + no more '$debug': full speed *and* full debug information.
- + new read form: read(N) for next N bytes.
- + general read patterns now deprecated.
- (still available with -DCOMPAT_READPATTERNS.)
- + all return values are passed as arguments for the last function
- (old semantics still available with -DLUA_COMPAT_ARGRET)
- + garbage collection tag methods for tables now deprecated.
- + there is now only one tag method for order.
- API:
- + New API: fully re-entrant, simpler, and more efficient.
- + New debug API.
- Implementation:
- + faster than ever: cleaner virtual machine and new hashing algorithm.
- + non-recursive garbage-collector algorithm.
- + reduced memory usage for programs with many strings.
- + improved treatment for memory allocation errors.
- + improved support for 16-bit machines (we hope).
- + code now compiles unmodified as both ANSI C and C++.
- + numbers in bases other than 10 are converted using strtoul.
- + new -f option in Lua to support #! scripts.
- + luac can now combine text and binaries.
-
-* Changes from version 3.1 to 3.2
- -------------------------------
- + redirected all output in Lua's core to _ERRORMESSAGE and _ALERT.
- + increased limit on the number of constants and globals per function
- (from 2^16 to 2^24).
- + debugging info (lua_debug and hooks) moved into lua_state and new API
- functions provided to get and set this info.
- + new debug lib gives full debugging access within Lua.
- + new table functions "foreachi", "sort", "tinsert", "tremove", "getn".
- + new io functions "flush", "seek".
-
-* Changes from version 3.0 to 3.1
- -------------------------------
- + NEW FEATURE: anonymous functions with closures (via "upvalues").
- + new syntax:
- - local variables in chunks.
- - better scope control with DO block END.
- - constructors can now be also written: { record-part; list-part }.
- - more general syntax for function calls and lvalues, e.g.:
- f(x).y=1
- o:f(x,y):g(z)
- f"string" is sugar for f("string")
- + strings may now contain arbitrary binary data (e.g., embedded zeros).
- + major code re-organization and clean-up; reduced module interdependecies.
- + no arbitrary limits on the total number of constants and globals.
- + support for multiple global contexts.
- + better syntax error messages.
- + new traversal functions "foreach" and "foreachvar".
- + the default for numbers is now double.
- changing it to use floats or longs is easy.
- + complete debug information stored in pre-compiled chunks.
- + sample interpreter now prompts user when run interactively, and also
- handles control-C interruptions gracefully.
-
-* Changes from version 2.5 to 3.0
- -------------------------------
- + NEW CONCEPT: "tag methods".
- Tag methods replace fallbacks as the meta-mechanism for extending the
- semantics of Lua. Whereas fallbacks had a global nature, tag methods
- work on objects having the same tag (e.g., groups of tables).
- Existing code that uses fallbacks should work without change.
- + new, general syntax for constructors {[exp] = exp, ... }.
- + support for handling variable number of arguments in functions (varargs).
- + support for conditional compilation ($if ... $else ... $end).
- + cleaner semantics in API simplifies host code.
- + better support for writing libraries (auxlib.h).
- + better type checking and error messages in the standard library.
- + luac can now also undump.
-
-* Changes from version 2.4 to 2.5
- -------------------------------
- + io and string libraries are now based on pattern matching;
- the old libraries are still available for compatibility
- + dofile and dostring can now return values (via return statement)
- + better support for 16- and 64-bit machines
- + expanded documentation, with more examples
-
-* Changes from version 2.2 to 2.4
- -------------------------------
- + external compiler creates portable binary files that can be loaded faster
- + interface for debugging and profiling
- + new "getglobal" fallback
- + new functions for handling references to Lua objects
- + new functions in standard lib
- + only one copy of each string is stored
- + expanded documentation, with more examples
-
-* Changes from version 2.1 to 2.2
- -------------------------------
- + functions now may be declared with any "lvalue" as a name
- + garbage collection of functions
- + support for pipes
-
-* Changes from version 1.1 to 2.1
- -------------------------------
- + object-oriented support
- + fallbacks
- + simplified syntax for tables
- + many internal improvements
-
-(end of HISTORY)
+++ /dev/null
-This is Lua 5.0.
-
-* Installation
- ------------
- Building Lua on a Unix system should be very easy:
-
- 1. Read "config" and edit it to suit your platform and needs.
- We strongly recommend that you enable support for dynamic loading,
- if your platform allows it.
- 2. Do "make".
- 3. If you want to install Lua in an "official" place in your system,
- then do "make install". The official place and the way to install
- files are defined in "config". You may have to be root to do this.
-
- See below for instructions for Windows and other systems.
-
-* What you get
- ------------
- If "make" succeeds, you get:
- * an interpreter in ./bin/lua and a compiler in ./bin/luac;
- * libraries in ./lib;
- * include files in ./include.
- These are the only directories you need for development.
-
- There are man pages for lua and luac, in both nroff and html; a reference
- manual in html in ./doc, some sample code in ./test, and some useful stuff
- in ./etc. You don't need these directories for development.
-
- See also the README files in the various subdirectories.
- A convenient starting point is ./doc/readme.html.
-
-* If you have problems (and solutions!)
- -------------------------------------
- If "make" fails, please let us know (lua@tecgraf.puc-rio.br).
- If you make changes to "config" or to the Makefiles, please send them to us.
-
-* Shared libraries
- ----------------
- If you are running Linux, do "make so" after "make" succeeds.
- This will create shared libraries in ./lib.
- To install those shared libraries in an official place, do "make soinstall".
-
- If you want the interpreter and the compiler to use shared libraries,
- then do "make sobin" too. You may want to do this before "make install".
-
- If you only want the shared libraries, you may want to add -fPIC to MYCFLAGS
- in "config". Also, you may need to run "ldconfig" as root.
-
- You may need to include ./lib in the LD_LIBRARY_PATH environment variable
- to link programs that use the shared libraries if you don't put them in the
- official places with "make install". (You may need to use the full path.)
-
- Building shared libraries in other systems is similar but details differ;
- you may need to fix a few details in the top-level Makefile.
-
-* Installation on Windows and other systems
- -----------------------------------------------------
- The instructions for building Lua on other systems machine depend on the
- particular compiler you are using. The simplest way is to create a folder
- with all .c and .h files, and then create projects for the core library,
- the standard library, the interpreter, and the compiler, as follows:
-
- core lib: lapi.c lcode.c ldebug.c ldo.c ldump.c lfunc.c lgc.c llex.c
- lmem.c lobject.c lopcodes.c lparser.c lstate.c lstring.c
- ltable.c ltests.c ltm.c lundump.c lvm.c lzio.c
-
- standard lib: lauxlib.c lbaselib.c ldblib.c liolib.c lmathlib.c ltablib.c
- lstrlib.c loadlib.c
-
- interpreter: core lib, standard lib, lua.c
-
- compiler: core lib, standard lib, luac.c print.c
- and also lopcodes.c (with LUA_OPNAMES defined) from core.
-
- Of course, to use Lua as a library, you'll have to know how to create
- and use libraries with your compiler.
-
- Also, read "config" to see what can be customized at compilation time.
-
-(end of INSTALL)
+++ /dev/null
-MANIFEST contents of Lua 5.0.2 distribution on Wed Mar 17 17:59:01 BRT 2004
-lua-5.0.2
-lua-5.0.2/COPYRIGHT
-lua-5.0.2/DIFFS
-lua-5.0.2/HISTORY
-lua-5.0.2/INSTALL
-lua-5.0.2/MANIFEST
-lua-5.0.2/Makefile
-lua-5.0.2/README
-lua-5.0.2/UPDATE
-lua-5.0.2/bin
-lua-5.0.2/build
-lua-5.0.2/config
-lua-5.0.2/configure
-lua-5.0.2/doc
-lua-5.0.2/doc/contents.html
-lua-5.0.2/doc/logo.gif
-lua-5.0.2/doc/lua.1
-lua-5.0.2/doc/lua.html
-lua-5.0.2/doc/luac.1
-lua-5.0.2/doc/luac.html
-lua-5.0.2/doc/manual.html
-lua-5.0.2/doc/readme.html
-lua-5.0.2/etc
-lua-5.0.2/etc/Makefile
-lua-5.0.2/etc/README
-lua-5.0.2/etc/bin2c.c
-lua-5.0.2/etc/compat.lua
-lua-5.0.2/etc/doall.lua
-lua-5.0.2/etc/lua.ico
-lua-5.0.2/etc/lua.magic
-lua-5.0.2/etc/lua.xpm
-lua-5.0.2/etc/luser_number.h
-lua-5.0.2/etc/luser_tests.h
-lua-5.0.2/etc/min.c
-lua-5.0.2/etc/noparser.c
-lua-5.0.2/etc/saconfig.c
-lua-5.0.2/etc/trace.c
-lua-5.0.2/include
-lua-5.0.2/include/Makefile
-lua-5.0.2/include/lauxlib.h
-lua-5.0.2/include/lua.h
-lua-5.0.2/include/lualib.h
-lua-5.0.2/lib
-lua-5.0.2/src
-lua-5.0.2/src/Makefile
-lua-5.0.2/src/README
-lua-5.0.2/src/lapi.c
-lua-5.0.2/src/lapi.h
-lua-5.0.2/src/lcode.c
-lua-5.0.2/src/lcode.h
-lua-5.0.2/src/ldebug.c
-lua-5.0.2/src/ldebug.h
-lua-5.0.2/src/ldo.c
-lua-5.0.2/src/ldo.h
-lua-5.0.2/src/ldump.c
-lua-5.0.2/src/lfunc.c
-lua-5.0.2/src/lfunc.h
-lua-5.0.2/src/lgc.c
-lua-5.0.2/src/lgc.h
-lua-5.0.2/src/lib
-lua-5.0.2/src/lib/Makefile
-lua-5.0.2/src/lib/README
-lua-5.0.2/src/lib/lauxlib.c
-lua-5.0.2/src/lib/lbaselib.c
-lua-5.0.2/src/lib/ldblib.c
-lua-5.0.2/src/lib/liolib.c
-lua-5.0.2/src/lib/lmathlib.c
-lua-5.0.2/src/lib/loadlib.c
-lua-5.0.2/src/lib/lstrlib.c
-lua-5.0.2/src/lib/ltablib.c
-lua-5.0.2/src/llex.c
-lua-5.0.2/src/llex.h
-lua-5.0.2/src/llimits.h
-lua-5.0.2/src/lmem.c
-lua-5.0.2/src/lmem.h
-lua-5.0.2/src/lobject.c
-lua-5.0.2/src/lobject.h
-lua-5.0.2/src/lopcodes.c
-lua-5.0.2/src/lopcodes.h
-lua-5.0.2/src/lparser.c
-lua-5.0.2/src/lparser.h
-lua-5.0.2/src/lstate.c
-lua-5.0.2/src/lstate.h
-lua-5.0.2/src/lstring.c
-lua-5.0.2/src/lstring.h
-lua-5.0.2/src/ltable.c
-lua-5.0.2/src/ltable.h
-lua-5.0.2/src/ltests.c
-lua-5.0.2/src/ltm.c
-lua-5.0.2/src/ltm.h
-lua-5.0.2/src/lua
-lua-5.0.2/src/lua/Makefile
-lua-5.0.2/src/lua/README
-lua-5.0.2/src/lua/lua.c
-lua-5.0.2/src/luac
-lua-5.0.2/src/luac/Makefile
-lua-5.0.2/src/luac/README
-lua-5.0.2/src/luac/luac.c
-lua-5.0.2/src/luac/print.c
-lua-5.0.2/src/lundump.c
-lua-5.0.2/src/lundump.h
-lua-5.0.2/src/lvm.c
-lua-5.0.2/src/lvm.h
-lua-5.0.2/src/lzio.c
-lua-5.0.2/src/lzio.h
-lua-5.0.2/test
-lua-5.0.2/test/README
-lua-5.0.2/test/bisect.lua
-lua-5.0.2/test/cf.lua
-lua-5.0.2/test/echo.lua
-lua-5.0.2/test/env.lua
-lua-5.0.2/test/factorial.lua
-lua-5.0.2/test/fib.lua
-lua-5.0.2/test/fibfor.lua
-lua-5.0.2/test/globals.lua
-lua-5.0.2/test/hello.lua
-lua-5.0.2/test/life.lua
-lua-5.0.2/test/lua
-lua-5.0.2/test/luac
-lua-5.0.2/test/luac.lua
-lua-5.0.2/test/printf.lua
-lua-5.0.2/test/readonly.lua
-lua-5.0.2/test/sieve.lua
-lua-5.0.2/test/sort.lua
-lua-5.0.2/test/table.lua
-lua-5.0.2/test/trace-calls.lua
-lua-5.0.2/test/trace-globals.lua
-lua-5.0.2/test/undefined.lua
-lua-5.0.2/test/xd.lua
-END OF MANIFEST
+++ /dev/null
-# makefile for Lua hierarchy
-# see INSTALL for installation instructions
-# see config for customization instructions
-
-LUA= .
-
-include $(LUA)/config
-
-# primary targets ("co" and "klean" are used for making the distribution)
-all clean co klean: dirs
- cd include; $(MAKE) $@
- cd src; $(MAKE) $@
- cd src/lib; $(MAKE) $@
- cd src/luac; $(MAKE) $@
- cd src/lua; $(MAKE) $@
-
-# in case they were not created during unpacking
-dirs: bin lib
-
-bin lib:
- mkdir -p $@
-
-# simple test to see Lua working
-test: all
- bin/lua test/hello.lua
-
-# remove debug information from binaries
-strip:
- $(STRIP) bin/*
-
-# official installation
-install: all strip
- mkdir -p $(INSTALL_BIN) $(INSTALL_INC) $(INSTALL_LIB) $(INSTALL_MAN)
- $(INSTALL_EXEC) bin/* $(INSTALL_BIN)
- $(INSTALL_DATA) include/*.h $(INSTALL_INC)
- $(INSTALL_DATA) lib/*.a $(INSTALL_LIB)
- $(INSTALL_DATA) doc/*.1 $(INSTALL_MAN)
-
-# shared libraries (for Linux)
-so:
- ld -o lib/liblua.so.$V -shared src/*.o
- ld -o lib/liblualib.so.$V -shared src/lib/*.o
- cd lib; ln -fs liblua.so.$V liblua.so; ln -fs liblualib.so.$V liblualib.so
-
-# binaries using shared libraries
-sobin:
- rm -f bin/*
- cd src/lua; $(MAKE)
- cd src/luac; $(MAKE)
-
-# install shared libraries
-soinstall:
- $(INSTALL_EXEC) lib/*.so.* $(INSTALL_LIB)
- cd $(INSTALL_LIB); ln -fs liblua.so.$V liblua.so; ln -fs liblualib.so.$V liblualib.so
-
-# clean shared libraries
-soclean:
- rm -f lib/*.so* bin/*
-
-# echo config parameters
-echo:
- @echo ""
- @echo "These are the parameters currently set in $(LUA)/config to build Lua $V:"
- @echo ""
- @echo "LOADLIB = $(LOADLIB)"
- @echo "DLLIB = $(DLLIB)"
- @echo "NUMBER = $(NUMBER)"
- @echo "POPEN = $(POPEN)"
- @echo "TMPNAM = $(TMPNAM)"
- @echo "DEGREES = $(DEGREES)"
- @echo "USERCONF = $(USERCONF)"
- @echo "CC = $(CC)"
- @echo "WARN = $(WARN)"
- @echo "MYCFLAGS = $(MYCFLAGS)"
- @echo "MYLDFLAGS = $(MYLDFLAGS)"
- @echo "EXTRA_LIBS = $(EXTRA_LIBS)"
- @echo "AR = $(AR)"
- @echo "RANLIB = $(RANLIB)"
- @echo "STRIP = $(STRIP)"
- @echo "INSTALL_ROOT = $(INSTALL_ROOT)"
- @echo "INSTALL_BIN = $(INSTALL_BIN)"
- @echo "INSTALL_INC = $(INSTALL_INC)"
- @echo "INSTALL_LIB = $(INSTALL_LIB)"
- @echo "INSTALL_MAN = $(INSTALL_MAN)"
- @echo "INSTALL_EXEC = $(INSTALL_EXEC)"
- @echo "INSTALL_DATA = $(INSTALL_DATA)"
- @echo ""
- @echo "Edit $(LUA)/config if needed to suit your platform and then run make."
- @echo ""
-
-# turn config into Lua code
-# uncomment the last sed expression if you want nil instead of empty strings
-lecho:
- @echo "-- $(LUA)/config for Lua $V"
- @echo "VERSION = '$(V)'"
- @make echo | grep = | sed -e 's/= /= "/' -e 's/$$/"/' #-e 's/""/nil/'
- @echo "-- EOF"
-
-newer:
- @find . -newer MANIFEST -type f
-
-# (end of Makefile)
+++ /dev/null
-This is Lua 5.0.
-See HISTORY for a summary of changes since the last released version.
-
-* What is Lua?
- ------------
- Lua is a powerful, light-weight programming language designed for extending
- applications. Lua is also frequently used as a general-purpose, stand-alone
- language. Lua is free software.
-
- For complete information, visit Lua's web site at http://www.lua.org/ .
- For an executive summary, see http://www.lua.org/about.html .
-
- Lua has been used in many different projects around the world.
- For a short list, see http://www.lua.org/uses.html .
-
-* Availability
- ------------
- Lua is freely available for both academic and commercial purposes.
- See COPYRIGHT and http://www.lua.org/license.html for details.
- Lua can be downloaded from its official site http://www.lua.org/ and
- several other sites aroung the world. For a complete list of mirror sites,
- see http://www.lua.org/mirrors.html .
-
-* Installation
- ------------
- Lua is implemented in pure ANSI C, and compiles unmodified in all known
- platforms that have an ANSI C compiler. Under Unix, simply typing "make"
- should work. See INSTALL for detailed instructions.
-
-* Contacting the authors
- ----------------------
- Send your comments, questions, and bug reports to lua@tecgraf.puc-rio.br.
- For more information about the authors, see http://www.lua.org/authors.html .
- For reporting bugs, try also the mailing list: lua-l@tecgraf.puc-rio.br.
- For more information about this list, including instructions on how to
- subscribe and access the archives, see http://www.lua.org/lua-l.html .
-
-* Origin
- ------
- Lua is developed at Tecgraf, the Computer Graphics Technology Group
- of PUC-Rio (the Pontifical Catholic University of Rio de Janeiro in Brazil).
- Tecgraf is a laboratory of the Department of Computer Science.
-
-(end of README)
+++ /dev/null
-This is Lua 5.0.2, an update of Lua 5.0 that includes the following changes,
-which fix all known bugs in Lua 5.0. For the exact differences, see DIFFS.
-
-src/ldo.c
- Attempt to resume running coroutine crashed Lua
-src/lgc.c
- C functions also may have stacks larger than current top
- Userdata to be collected still counted into new GC threshold
-src/lgc.h
- Userdata to be collected still counted into new GC threshold
-src/lparser.c
- Syntax `local function' did not increment stack size
-src/lvm.c
- `pc' address was invalidated when a coroutine was suspended
- Count hook might be called without being set
-src/lib/lbaselib.c
- Buffer overflow for unusual %p representation
- Wrong number of returns from chunks loaded from stdin
-src/lib/liolib.c
- `file.close()' could not be called without arguments
- Buffer overflow for unusual %p representation
-src/luac/luac.c
- Missing lock/unlock
+++ /dev/null
-# If you don't want to use make, run this script.
-# But make sure you read config to see what can be customized.
-
-
-# Easiest way to build bin/lua:
-# cc -O2 -o bin/lua -Iinclude -Isrc src/*.c src/lib/*.c src/lua/*.c -lm -ldl
-
-
-# Easiest way to build Lua libraries and executables:
-echo -n 'building core library... '
-cd src
-cc -O2 -c -I../include *.c
-ar rc ../lib/liblua.a *.o
-rm -f *.o
-
-echo -n 'standard library... '
-cd lib
-cc -O2 -c -I../../include *.c
-ar rc ../../lib/liblualib.a *.o
-rm -f *.o
-
-echo -n 'lua... '
-cd ../lua
-cc -O2 -o ../../bin/lua -I../../include *.c ../../lib/*.a -lm -ldl
-
-echo -n 'luac... '
-cd ../luac
-cc -O2 -o ../../bin/luac -I../../include -I.. *.c -DLUA_OPNAMES ../lopcodes.c ../../lib/*.a
-
-echo 'done'
-
-cd ../..
-bin/lua test/hello.lua
+++ /dev/null
-# configuration file for making Lua 5.0
-# see INSTALL for installation instructions
-
-# These are default values. Skip this section and see the explanations below.
-
-LOADLIB=
-DLLIB=
-NUMBER=
-POPEN=
-TMPNAM=
-DEGREES=
-USERCONF=
-
-# == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT =======================
-
-# --------------------------------------------------------------- Lua libraries
-
-# Support for dynamically loading C libraries for Lua is a very important
-# feature, which we strongly recommend be enabled. By default, this support is
-# enabled on Windows systems (see below) but disabled on other systems because
-# it relies on system-dependent code that is not part of ANSI C. For more
-# information on dynamic loading, read the comments in src/lib/liolib.c .
-#
-# To enable support for dynamic loading on Unix systems that support the dlfcn
-# interface (e.g., Linux, Solaris, IRIX, BSD, AIX, HPUX, and probably others),
-# uncomment the next two lines.
-#
-#LOADLIB= -DUSE_DLOPEN=1
-#DLLIB= -ldl
-#
-# In Linux with gcc, you should also uncomment the next definition for
-# MYLDFLAGS, which passes -E (= -export-dynamic) to the linker. This option
-# allows dynamic libraries to link back to the `lua' program, so that they do
-# not need the Lua libraries. (Other systems may have an equivalent facility.)
-#
-#MYLDFLAGS= -Wl,-E
-#
-# On Windows systems. support for dynamic loading is enabled by default.
-# To disable this support, uncomment the next line.
-#
-#LOADLIB= -DUSE_DLL=0
-
-# The Lua IO library (src/lib/liolib.c) has support for pipes using popen and
-# pclose. This support is enabled by default on POSIX systems.
-# If your system is not POSIX but has popen and pclose, define USE_POPEN=1.
-# If you don't want to support pipes, define USE_POPEN=0.
-#
-#POPEN= -DUSE_POPEN=1
-#POPEN= -DUSE_POPEN=0
-#
-# The form below will probably work in (some) Windows systems.
-#
-#POPEN= -DUSE_POPEN=1 -Dpopen=_popen -Dpclose=_pclose
-
-# The Lua OS library (src/lib/liolib.c) exports an interface to the C function
-# tmpnam, which gcc now thinks is `dangerous'. So, support for tmpnam is
-# disabled by default when compiling with gcc.
-# If you still want to use tmpnam, define USE_TMPNAME=1. If you don't want to
-# use tmpnam even if you're not compiling with gcc, define USE_TMPNAME=0.
-#
-#TMPNAM= -DUSE_TMPNAME=1
-#TMPNAM= -DUSE_TMPNAME=0
-
-# The Lua math library (src/lib/lmathlib.c) now operates in radians, unlike
-# previous versions of Lua, which used degrees. To use degrees instead of
-# radians, define USE_DEGREES.
-#
-#DEGREES= -DUSE_DEGREES
-
-# ------------------------------------------------------------------ Lua core
-
-# Lua uses double for numbers. To change this, uncomment and edit the following
-# line, changing USE_XXX to one of USE_DOUBLE, USE_FLOAT, USE_LONG, USE_INT.
-#
-#NUMBER= -DLUA_USER_H='"../etc/luser_number.h"' -DUSE_XXX
-
-# When compiling Lua with gcc on a Pentium machine, using a fast rounding
-# method for the conversion of doubles to ints can give around 20% speed
-# improvement. To use this rounding method, uncomment the following line.
-#NUMBER= -DLUA_USER_H='"../etc/luser_number.h"' -DUSE_FASTROUND
-
-# For partial compatibility with old upvalue syntax, define LUA_COMPATUPSYNTAX.
-# For partial compatibility with old upvalue behavior in C functions, define
-# LUA_COMPATUPVALUES. Add these definitions to MYCFLAGS.
-#
-# -DLUA_COMPATUPSYNTAX -DLUA_COMPATUPVALUES
-
-# ------------------------------------------------------------- Lua interpreter
-
-# The stand-alone Lua interpreter needs the math functions, which are usually
-# in libm.a (-lm). If your C library already includes the math functions,
-# or if you are using a modified interpreter that does not need them,
-# then comment the following line or add the appropriates libraries.
-#
-EXTRA_LIBS= -lm
-
-# If you want to customize the stand-alone Lua interpreter, uncomment and
-# edit the following two lines; also edit etc/saconfig.c to suit your needs.
-# -DUSE_READLINE adds line editing and history to the interpreter. You need
-# to add -lreadline (and perhaps also -lhistory and -lcurses or -lncurses)
-# to EXTRA_LIBS.
-#
-#USERCONF=-DLUA_USERCONFIG='"$(LUA)/etc/saconfig.c"' -DUSE_READLINE
-#EXTRA_LIBS= -lm -ldl -lreadline # -lhistory -lcurses -lncurses
-
-# ------------------------------------------------------------------ C compiler
-
-# You need an ANSI C compiler. gcc is a popular one. We do not use -ansi in
-# WARN because it disables POSIX features used in the libraries.
-#
-CC= gcc
-WARN= -Wall
-
-# ------------------------------------------------------------------ C options
-
-# Write here any options you may need for your C compiler.
-# If you are using gcc, -O3 will get you a faster but larger code. You can
-# also add -fomit-frame-pointer to get even faster code at the cost of losing
-# debug information. If you only want the shared libraries, you may want to
-# add -fPIC to MYCFLAGS.
-#
-MYCFLAGS= -O2
-#MYCFLAGS= -O3 -fomit-frame-pointer # -fPIC
-
-# Write here any options you may need for your C linker.
-#MYLDFLAGS=
-
-# ------------------------------------------------------------------ librarian
-
-# This should work in all Unix systems.
-#
-AR= ar rcu
-
-# If your system doesn't have (or need) ranlib, use RANLIB=true.
-# On some systems, "ar s" does what ranlib would do.
-#
-RANLIB= ranlib
-#RANLIB= ar s
-#RANLIB= true
-
-# ------------------------------------------------------------------ stripper
-
-# This should work in all Unix systems, but you may want to add options.
-#
-STRIP= strip
-
-# ------------------------------------------------------------------ install
-
-# Locations for "make install". You may need to be root do "make install".
-#
-INSTALL_ROOT= /usr/local
-INSTALL_BIN= $(INSTALL_ROOT)/bin
-INSTALL_INC= $(INSTALL_ROOT)/include
-INSTALL_LIB= $(INSTALL_ROOT)/lib
-INSTALL_MAN= $(INSTALL_ROOT)/man/man1
-
-# You may prefer to use "install" instead of "cp" if you have it.
-# If you use "install", you may also want to change the permissions after -m.
-#
-INSTALL_EXEC= cp
-INSTALL_DATA= cp
-#INSTALL_EXEC= install -m 0755
-#INSTALL_DATA= install -m 0644
-
-# == END OF USER SETTINGS. NO NEED TO CHANGE ANYTHING BELOW THIS LINE =========
-
-V=5.0
-
-BIN= $(LUA)/bin
-INC= $(LUA)/include
-LIB= $(LUA)/lib
-
-INCS= -I$(INC) $(EXTRA_INCS)
-DEFS= $(NUMBER) $(EXTRA_DEFS)
-
-CFLAGS= $(MYCFLAGS) $(WARN) $(INCS) $(DEFS)
-
-# (end of config)
+++ /dev/null
-#!/bin/sh
-
-# Lua does not use GNU autoconf; just edit ./config if needed to suit your
-# platform and then run make.
-
-# This shows the parameters currently set in ./config:
-make echo
-
-# If you want config as a Lua program, run "make lecho".
+++ /dev/null
-<HTML>
-<HEAD>
-<TITLE>Lua: 5.0 reference manual - contents</TITLE>
-</HEAD>
-
-<BODY BGCOLOR="#FFFFFF">
-
-<HR>
-<H1>
-<A HREF="http://www.lua.org/home.html"><IMG SRC="logo.gif" ALT="Lua" BORDER=0></A>
-Reference manual for Lua 5.0
-</H1>
-
-<A HREF="manual.html">Lua 5.0 Reference Manual</A>
-[
-<A HREF="manual.html">top</A>
-|
-<A HREF="http://www.lua.org/ftp/refman-5.0.ps.gz">ps</A>
-|
-<A HREF="http://www.lua.org/ftp/refman-5.0.pdf">pdf</A>
-]
-<P>
-
-<SMALL>
-<A HREF="http://www.lua.org/copyright.html">Copyright</A>
-© 2003 Tecgraf, PUC-Rio. All rights reserved.</SMALL>
-<HR>
-
-<UL>
-<LI><A HREF="manual.html#1">1 - Introduction</A>
-<LI><A HREF="manual.html#2">2 - The Language</A>
-<UL>
-<LI><A HREF="manual.html#2.1">2.1 - Lexical Conventions</A>
-<LI><A HREF="manual.html#2.2">2.2 - Values and Types</A>
-<UL>
-<LI><A HREF="manual.html#2.2.1">2.2.1 - Coercion</A>
-</UL>
-<LI><A HREF="manual.html#2.3">2.3 - Variables</A>
-<LI><A HREF="manual.html#2.4">2.4 - Statements</A>
-<UL>
-<LI><A HREF="manual.html#2.4.1">2.4.1 - Chunks</A>
-<LI><A HREF="manual.html#2.4.2">2.4.2 - Blocks</A>
-<LI><A HREF="manual.html#2.4.3">2.4.3 - Assignment</A>
-<LI><A HREF="manual.html#2.4.4">2.4.4 - Control Structures</A>
-<LI><A HREF="manual.html#2.4.5">2.4.5 - For Statement</A>
-<LI><A HREF="manual.html#2.4.6">2.4.6 - Function Calls as Statements</A>
-<LI><A HREF="manual.html#2.4.7">2.4.7 - Local Declarations</A>
-</UL>
-<LI><A HREF="manual.html#2.5">2.5 - Expressions</A>
-<UL>
-<LI><A HREF="manual.html#2.5.1">2.5.1 - Arithmetic Operators</A>
-<LI><A HREF="manual.html#2.5.2">2.5.2 - Relational Operators</A>
-<LI><A HREF="manual.html#2.5.3">2.5.3 - Logical Operators</A>
-<LI><A HREF="manual.html#2.5.4">2.5.4 - Concatenation</A>
-<LI><A HREF="manual.html#2.5.5">2.5.5 - Precedence</A>
-<LI><A HREF="manual.html#2.5.6">2.5.6 - Table Constructors</A>
-<LI><A HREF="manual.html#2.5.7">2.5.7 - Function Calls</A>
-<LI><A HREF="manual.html#2.5.8">2.5.8 - Function Definitions</A>
-</UL>
-</UL>
-<UL>
-<LI><A HREF="manual.html#2.6">2.6 - Visibility Rules</A>
-<LI><A HREF="manual.html#2.7">2.7 - Error Handling</A>
-<LI><A HREF="manual.html#2.8">2.8 - Metatables</A>
-<LI><A HREF="manual.html#2.9">2.9 - Garbage Collection</A>
-<UL>
-<LI><A HREF="manual.html#2.9.1">2.9.1 - Garbage-Collection Metamethods</A>
-<LI><A HREF="manual.html#2.9.2">2.9.2 - Weak Tables</A>
-</UL>
-<LI><A HREF="manual.html#2.10">2.10 - Coroutines</A>
-</UL>
-<LI><A HREF="manual.html#3">3 - The Application Program Interface</A>
-<UL>
-<LI><A HREF="manual.html#3.1">3.1 - States</A>
-<LI><A HREF="manual.html#3.2">3.2 - The Stack and Indices</A>
-<LI><A HREF="manual.html#3.3">3.3 - Stack Manipulation</A>
-<LI><A HREF="manual.html#3.4">3.4 - Querying the Stack</A>
-<LI><A HREF="manual.html#3.5">3.5 - Getting Values from the Stack</A>
-<LI><A HREF="manual.html#3.6">3.6 - Pushing Values onto the Stack</A>
-<LI><A HREF="manual.html#3.7">3.7 - Controlling Garbage Collection</A>
-<LI><A HREF="manual.html#3.8">3.8 - Userdata</A>
-<LI><A HREF="manual.html#3.9">3.9 - Metatables</A>
-<LI><A HREF="manual.html#3.10">3.10 - Loading Lua Chunks</A>
-<LI><A HREF="manual.html#3.11">3.11 - Manipulating Tables</A>
-<LI><A HREF="manual.html#3.12">3.12 - Manipulating Environments</A>
-<LI><A HREF="manual.html#3.13">3.13 - Using Tables as Arrays</A>
-<LI><A HREF="manual.html#3.14">3.14 - Calling Functions</A>
-<LI><A HREF="manual.html#3.15">3.15 - Protected Calls</A>
-<LI><A HREF="manual.html#3.16">3.16 - Defining C Functions</A>
-<LI><A HREF="manual.html#3.17">3.17 - Defining C Closures</A>
-<LI><A HREF="manual.html#3.18">3.18 - Registry</A>
-<LI><A HREF="manual.html#3.19">3.19 - Error Handling in C</A>
-<LI><A HREF="manual.html#3.20">3.20 - Threads</A>
-</UL>
-<LI><A HREF="manual.html#4">4 - The Debug Interface</A>
-<UL>
-<LI><A HREF="manual.html#4.1">4.1 - Stack and Function Information</A>
-<LI><A HREF="manual.html#4.2">4.2 - Manipulating Local Variables and Upvalues</A>
-<LI><A HREF="manual.html#4.3">4.3 - Hooks</A>
-</UL>
-<LI><A HREF="manual.html#5">5 - Standard Libraries</A>
-<UL>
-<LI><A HREF="manual.html#5.1">5.1 - Basic Functions</A>
-<LI><A HREF="manual.html#5.2">5.2 - Coroutine Manipulation</A>
-<LI><A HREF="manual.html#5.3">5.3 - String Manipulation</A>
-<LI><A HREF="manual.html#5.4">5.4 - Table Manipulation</A>
-<LI><A HREF="manual.html#5.5">5.5 - Mathematical Functions</A>
-<LI><A HREF="manual.html#5.6">5.6 - Input and Output Facilities</A>
-<LI><A HREF="manual.html#5.7">5.7 - Operating System Facilities</A>
-<LI><A HREF="manual.html#5.8">5.8 - The Reflexive Debug Interface</A>
-</UL>
-<LI><A HREF="manual.html#6">6 - Lua Stand-alone</A>
-<LI><A HREF="manual.html#BNF">The Complete Syntax of Lua</A>
-</UL>
-
-<HR>
-<SMALL>
-Last update:
-Wed May 7 18:34:34 EST 2003
-</SMALL>
-
-</BODY>
-</HTML>
+++ /dev/null
-.\" lua.man,v 1.8 2003/04/02 00:05:20 lhf Exp
-.TH LUA 1 "2003/04/02 00:05:20"
-.SH NAME
-lua \- Lua interpreter
-.SH SYNOPSIS
-.B lua
-[
-.I options
-]
-[
-.I script
-[
-.I args
-]
-]
-.SH DESCRIPTION
-.B lua
-is the stand-alone Lua interpreter.
-It loads and executes Lua programs,
-either in textual source form or
-in precompiled binary form.
-(Precompiled binaries are output by
-.BR luac ,
-the Lua compiler.)
-.B lua
-can be used as a batch interpreter and also interactively.
-.LP
-The given
-.I options
-(see below)
-are executed and then
-the Lua program in file
-.I script
-is loaded and executed.
-The given
-.I args
-are available to
-.I script
-as strings in a global table named
-.BR arg .
-If these arguments contain spaces or other characters special to the shell,
-then they should be quoted
-(but note that the quotes will be removed by the shell).
-The arguments in
-.B arg
-start at 0,
-which contains the string
-.RI ` script '.
-The index of the last argument is stored in
-.BR "arg.n" .
-The arguments given in the command line before
-.IR script ,
-including the name of the interpreter,
-are available in negative indices in
-.BR arg .
-.LP
-At the very start,
-before even handling the command line,
-.B lua
-executes the contents of the environment variable
-.BR LUA_INIT ,
-if it is defined.
-If the value of
-.B LUA_INIT
-is of the form
-.RI `@ filename ',
-then
-.I filename
-is executed.
-Otherwise, the string is assumed to be a Lua statement and is executed.
-.LP
-Options start with
-.B \-
-and are described below.
-You can use
-.B "\--"
-to signal the end of options.
-.LP
-If no arguments are given,
-then
-.B "\-v \-i"
-is assumed when the standard input is a terminal;
-otherwise,
-.B "\-"
-is assumed.
-.LP
-In interactive mode,
-.B lua
-prompts the user,
-reads lines from the standard input,
-and executes them as they are read.
-If a line does not contain a complete statement,
-then a secondary prompt is displayed and
-lines are read until a complete statement is formed or
-a syntax error is found.
-So, one way to interrupt the reading of an incomplete statement is
-to force a syntax error:
-adding a
-.B `;'
-in the middle of a statement is a sure way of forcing a syntax error
-(except inside multiline strings and comments; these must be closed explicitly).
-If a line starts with
-.BR `=' ,
-then
-.B lua
-displays the values of all the expressions in the remainder of the
-line. The expressions must be separated by commas.
-The primary prompt is the value of the global variable
-.BR _PROMPT ,
-if this value is a string;
-otherwise, the default prompt is used.
-Similarly, the secondary prompt is the value of the global variable
-.BR _PROMPT2 .
-So,
-to change the prompts,
-set the corresponding variable to a string of your choice.
-You can do that after calling the interpreter
-or on the command line with
-.BR "_PROMPT" "=\'lua: \'" ,
-for example.
-(Note the need for quotes, because the string contains a space.)
-The default prompts are ``> '' and ``>> ''.
-.SH OPTIONS
-.TP
-.B \-
-load and execute the standard input as a file,
-that is,
-not interactively,
-even when the standard input is a terminal.
-.TP
-.BI \-e " stat"
-execute statement
-.IR stat .
-You need to quote
-.I stat
-if it contains spaces, quotes,
-or other characters special to the shell.
-.TP
-.B \-i
-enter interactive mode after
-.I script
-is executed.
-.TP
-.BI \-l " file"
-call
-.BI require( file )
-before executing
-.IR script.
-Typically used to load libraries
-(hence the letter
-.IR l ).
-.TP
-.B \-v
-show version information.
-.SH "SEE ALSO"
-.BR luac (1)
-.br
-http://www.lua.org/
-.SH DIAGNOSTICS
-Error messages should be self explanatory.
-.SH AUTHORS
-R. Ierusalimschy,
-L. H. de Figueiredo,
-and
-W. Celes
-(lua@tecgraf.puc-rio.br)
-.\" EOF
+++ /dev/null
-<!-- lua.man,v 1.8 2003/04/02 00:05:20 lhf Exp -->
-<HTML>
-<HEAD>
-<TITLE>LUA man page</TITLE>
-</HEAD>
-
-<BODY BGCOLOR="#FFFFFF">
-
-<H1>NAME</H1>
-lua - Lua interpreter
-<H1>SYNOPSIS</H1>
-<B>lua</B>
-[
-<I>options</I>
-]
-[
-<I>script</I>
-[
-<I>args</I>
-]
-]
-<H1>DESCRIPTION</H1>
-<B>lua</B>
-is the stand-alone Lua interpreter.
-It loads and executes Lua programs,
-either in textual source form or
-in precompiled binary form.
-(Precompiled binaries are output by
-<B>luac</B>,
-the Lua compiler.)
-<B>lua</B>
-can be used as a batch interpreter and also interactively.
-<P>
-The given
-<I>options</I>
-(see below)
-are executed and then
-the Lua program in file
-<I>script</I>
-is loaded and executed.
-The given
-<I>args</I>
-are available to
-<I>script</I>
-as strings in a global table named
-<B>arg</B>.
-If these arguments contain spaces or other characters special to the shell,
-then they should be quoted
-(but note that the quotes will be removed by the shell).
-The arguments in
-<B>arg</B>
-start at 0,
-which contains the string
-`<I>script</I>'.
-The index of the last argument is stored in
-<B>"arg.n"</B>.
-The arguments given in the command line before
-<I>script</I>,
-including the name of the interpreter,
-are available in negative indices in
-<B>arg</B>.
-<P>
-At the very start,
-before even handling the command line,
-<B>lua</B>
-executes the contents of the environment variable
-<B>LUA_INIT</B>,
-if it is defined.
-If the value of
-<B>LUA_INIT</B>
-is of the form
-`@<I>filename</I>',
-then
-<I>filename</I>
-is executed.
-Otherwise, the string is assumed to be a Lua statement and is executed.
-<P>
-Options start with
-<B>-</B>
-and are described below.
-You can use
-<B>"--"</B>
-to signal the end of options.
-<P>
-If no arguments are given,
-then
-<B>"-v -i"</B>
-is assumed when the standard input is a terminal;
-otherwise,
-<B>"-"</B>
-is assumed.
-<P>
-In interactive mode,
-<B>lua</B>
-prompts the user,
-reads lines from the standard input,
-and executes them as they are read.
-If a line does not contain a complete statement,
-then a secondary prompt is displayed and
-lines are read until a complete statement is formed or
-a syntax error is found.
-So, one way to interrupt the reading of an incomplete statement is
-to force a syntax error:
-adding a
-<B>`;' </B>
-in the middle of a statement is a sure way of forcing a syntax error
-(except inside multiline strings and comments; these must be closed explicitly).
-If a line starts with
-<B>`='</B>,
-then
-<B>lua</B>
-displays the values of all the expressions in the remainder of the
-line. The expressions must be separated by commas.
-The primary prompt is the value of the global variable
-<B>_PROMPT</B>,
-if this value is a string;
-otherwise, the default prompt is used.
-Similarly, the secondary prompt is the value of the global variable
-<B>_PROMPT2</B>.
-So,
-to change the prompts,
-set the corresponding variable to a string of your choice.
-You can do that after calling the interpreter
-or on the command line with
-<B>"_PROMPT" "=\'lua: \'"</B>,
-for example.
-(Note the need for quotes, because the string contains a space.)
-The default prompts are ``> '' and ``>> ''.
-<H1>OPTIONS</H1>
-<P>
-<B>-</B>
-load and execute the standard input as a file,
-that is,
-not interactively,
-even when the standard input is a terminal.
-<P>
-<B>-e "</B><I>stat"</I>
-execute statement
-<I>stat</I>.
-You need to quote
-<I>stat </I>
-if it contains spaces, quotes,
-or other characters special to the shell.
-<P>
-<B>-i</B>
-enter interactive mode after
-<I>script</I>
-is executed.
-<P>
-<B>-l "</B><I>file"</I>
-call
-<B>require( file</B><I>)</I>
-before executing
-<I></I>script.
-Typically used to load libraries
-(hence the letter
-<I>l</I>).
-<P>
-<B>-v</B>
-show version information.
-<H1>SEE ALSO</H1>
-<B>luac</B>(1)
-<BR>
-<A HREF="http://www.lua.org/">http://www.lua.org/</A>
-<H1>DIAGNOSTICS</H1>
-Error messages should be self explanatory.
-<H1>AUTHORS</H1>
-R. Ierusalimschy,
-L. H. de Figueiredo,
-and
-W. Celes
-(<A HREF="mailto:lua-NO-SPAM-THANKS@tecgraf.puc-rio.br">lua AT tecgraf.puc-rio.br</A>)
-<!-- EOF -->
-</BODY>
-</HTML>
+++ /dev/null
-.\" luac.man,v 1.25 2002/12/13 11:45:12 lhf Exp
-.TH LUAC 1 "2002/12/13 11:45:12"
-.SH NAME
-luac \- Lua compiler
-.SH SYNOPSIS
-.B luac
-[
-.I options
-] [
-.I filenames
-]
-.SH DESCRIPTION
-.B luac
-is the Lua compiler.
-It translates programs written in the Lua programming language
-into binary files that can be latter loaded and executed.
-.LP
-The main advantages of precompiling chunks are:
-faster loading,
-protecting source code from user changes,
-and
-off-line syntax checking.
-.LP
-Pre-compiling does not imply faster execution
-because in Lua chunks are always compiled into bytecodes before being executed.
-.B luac
-simply allows those bytecodes to be saved in a file for later execution.
-.LP
-.B luac
-produces a single output file containing the bytecodes
-for all source files given.
-By default,
-the output file is named
-.BR luac.out ,
-but you can change this with the
-.B \-o
-option.
-.LP
-The binary files created by
-.B luac
-are portable to all architectures with the same word size.
-This means that
-binary files created on a 32-bit platform (such as Intel)
-can be read without change in another 32-bit platform (such as Sparc),
-even if the byte order (``endianness'') is different.
-On the other hand,
-binary files created on a 16-bit platform cannot be read in a 32-bit platform,
-nor vice-versa.
-.LP
-In the command line,
-you can mix
-text files containing Lua source and
-binary files containing precompiled chunks.
-This is useful to combine several precompiled chunks,
-even from different (but compatible) platforms,
-into a single precompiled chunk.
-.LP
-You can use
-.B "\-"
-to indicate the standard input as a source file
-and
-.B "\--"
-to signal the end of options
-(that is,
-all remaining arguments will be treated as files even if they start with
-.BR "\-" ).
-.LP
-The internal format of the binary files produced by
-.B luac
-is likely to change when a new version of Lua is released.
-So,
-save the source files of all Lua programs that you precompile.
-.LP
-.SH OPTIONS
-Options must be separate.
-.TP
-.B \-l
-produce a listing of the compiled bytecode for Lua's virtual machine.
-Listing bytecodes is useful to learn about Lua's virtual machine.
-If no files are given, then
-.B luac
-loads
-.B luac.out
-and lists its contents.
-.TP
-.BI \-o " file"
-output to
-.IR file ,
-instead of the default
-.BR luac.out .
-The output file may be a source file because
-all files are loaded before the output file is written.
-Be careful not to overwrite precious files.
-.TP
-.B \-p
-load files but do not generate any output file.
-Used mainly for syntax checking and for testing precompiled chunks:
-corrupted files will probably generate errors when loaded.
-Lua always performs a thorough integrity test on precompiled chunks.
-Bytecode that passes this test is completely safe,
-in the sense that it will not break the interpreter.
-However,
-there is no guarantee that such code does anything sensible.
-(None can be given, because the halting problem is unsolvable.)
-If no files are given, then
-.B luac
-loads
-.B luac.out
-and tests its contents.
-No messages are displayed if the file passes the integrity test.
-.TP
-.B \-s
-strip debug information before writing the output file.
-This saves some space in very large chunks,
-but if errors occur when running these chunks,
-then the error messages may not contain the full information they usually do
-(line numbers and names of locals are lost).
-.TP
-.B \-v
-show version information.
-.SH FILES
-.TP 15
-.B luac.out
-default output file
-.SH "SEE ALSO"
-.BR lua (1)
-.br
-http://www.lua.org/
-.SH DIAGNOSTICS
-Error messages should be self explanatory.
-.SH AUTHORS
-L. H. de Figueiredo,
-R. Ierusalimschy and
-W. Celes
-(lua@tecgraf.puc-rio.br)
-.\" EOF
+++ /dev/null
-<!-- luac.man,v 1.25 2002/12/13 11:45:12 lhf Exp -->
-<HTML>
-<HEAD>
-<TITLE>LUAC man page</TITLE>
-</HEAD>
-
-<BODY BGCOLOR="#FFFFFF">
-
-<H1>NAME</H1>
-luac - Lua compiler
-<H1>SYNOPSIS</H1>
-<B>luac</B>
-[
-<I>options</I>
-] [
-<I>filenames</I>
-]
-<H1>DESCRIPTION</H1>
-<B>luac</B>
-is the Lua compiler.
-It translates programs written in the Lua programming language
-into binary files that can be latter loaded and executed.
-<P>
-The main advantages of precompiling chunks are:
-faster loading,
-protecting source code from user changes,
-and
-off-line syntax checking.
-<P>
-Pre-compiling does not imply faster execution
-because in Lua chunks are always compiled into bytecodes before being executed.
-<B>luac</B>
-simply allows those bytecodes to be saved in a file for later execution.
-<P>
-<B>luac</B>
-produces a single output file containing the bytecodes
-for all source files given.
-By default,
-the output file is named
-<B>luac.out</B>,
-but you can change this with the
-<B>-o</B>
-option.
-<P>
-The binary files created by
-<B>luac</B>
-are portable to all architectures with the same word size.
-This means that
-binary files created on a 32-bit platform (such as Intel)
-can be read without change in another 32-bit platform (such as Sparc),
-even if the byte order (``endianness'') is different.
-On the other hand,
-binary files created on a 16-bit platform cannot be read in a 32-bit platform,
-nor vice-versa.
-<P>
-In the command line,
-you can mix
-text files containing Lua source and
-binary files containing precompiled chunks.
-This is useful to combine several precompiled chunks,
-even from different (but compatible) platforms,
-into a single precompiled chunk.
-<P>
-You can use
-<B>"-"</B>
-to indicate the standard input as a source file
-and
-<B>"--"</B>
-to signal the end of options
-(that is,
-all remaining arguments will be treated as files even if they start with
-<B>"-"</B>).
-<P>
-The internal format of the binary files produced by
-<B>luac</B>
-is likely to change when a new version of Lua is released.
-So,
-save the source files of all Lua programs that you precompile.
-<P>
-<H1>OPTIONS</H1>
-Options must be separate.
-<P>
-<B>-l</B>
-produce a listing of the compiled bytecode for Lua's virtual machine.
-Listing bytecodes is useful to learn about Lua's virtual machine.
-If no files are given, then
-<B>luac</B>
-loads
-<B>luac.out</B>
-and lists its contents.
-<P>
-<B>-o "</B><I>file"</I>
-output to
-<I>file</I>,
-instead of the default
-<B>luac.out</B>.
-The output file may be a source file because
-all files are loaded before the output file is written.
-Be careful not to overwrite precious files.
-<P>
-<B>-p</B>
-load files but do not generate any output file.
-Used mainly for syntax checking and for testing precompiled chunks:
-corrupted files will probably generate errors when loaded.
-Lua always performs a thorough integrity test on precompiled chunks.
-Bytecode that passes this test is completely safe,
-in the sense that it will not break the interpreter.
-However,
-there is no guarantee that such code does anything sensible.
-(None can be given, because the halting problem is unsolvable.)
-If no files are given, then
-<B>luac</B>
-loads
-<B>luac.out</B>
-and tests its contents.
-No messages are displayed if the file passes the integrity test.
-<P>
-<B>-s</B>
-strip debug information before writing the output file.
-This saves some space in very large chunks,
-but if errors occur when running these chunks,
-then the error messages may not contain the full information they usually do
-(line numbers and names of locals are lost).
-<P>
-<B>-v</B>
-show version information.
-<H1>FILES</H1>
-<P>
-<B>luac.out</B>
-default output file
-<H1>SEE ALSO</H1>
-<B>lua</B>(1)
-<BR>
-<A HREF="http://www.lua.org/">http://www.lua.org/</A>
-<H1>DIAGNOSTICS</H1>
-Error messages should be self explanatory.
-<H1>AUTHORS</H1>
-L. H. de Figueiredo,
-R. Ierusalimschy and
-W. Celes
-(<A HREF="mailto:lua-NO-SPAM-THANKS@tecgraf.puc-rio.br">lua AT tecgraf.puc-rio.br</A>)
-<!-- EOF -->
-</BODY>
-</HTML>
+++ /dev/null
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
-<html>
-
-<head>
-<TITLE>Lua: 5.0 reference manual</TITLE>
-</head>
-
-<body BGCOLOR="#FFFFFF">
-
-<hr>
-<h1>
-<A HREF="http://www.lua.org/home.html"><IMG SRC="logo.gif" ALT="Lua" BORDER=0></A>
-Lua 5.0 Reference Manual
-</h1>
-
-by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes
-<p>
-<small>
-<a HREF="http://www.lua.org/copyright.html">Copyright</a>
-© 2003 Tecgraf, PUC-Rio. All rights reserved.
-</small>
-<hr>
-
-<p>
-<p>
-<!-- ====================================================================== -->
-
-
-
-<a name="1"><h1>1 - Introduction</h1></a>
-
-<p>Lua is an extension programming language designed to support
-general procedural programming with data description
-facilities.
-It also offers good support for object-oriented programming,
-functional programming, and data-driven programming.
-Lua is intended to be used as a powerful, light-weight
-configuration language for any program that needs one.
-Lua is implemented as a library, written in <em>clean</em> C
-(that is, in the common subset of ANSI C and C++).
-
-<p>Being an extension language, Lua has no notion of a "main" program:
-it only works <em>embedded</em> in a host client,
-called the <em>embedding program</em> or simply the <em>host</em>.
-This host program can invoke functions to execute a piece of Lua code,
-can write and read Lua variables,
-and can register C functions to be called by Lua code.
-Through the use of C functions, Lua can be augmented to cope with
-a wide range of different domains,
-thus creating customized programming languages sharing a syntactical framework.
-
-<p>The Lua distribution includes a stand-alone embedding program,
-<code>lua</code>, that uses the Lua library to offer a complete Lua interpreter.
-
-<p>Lua is free software,
-and is provided as usual with no guarantees,
-as stated in its copyright notice.
-The implementation described in this manual is available
-at Lua's official web site, <code>www.lua.org</code>.
-
-<p>Like any other reference manual,
-this document is dry in places.
-For a discussion of the decisions behind the design of Lua,
-see the papers below,
-which are available at Lua's web site.
-<ul>
-<li>
-R. Ierusalimschy, L. H. de Figueiredo, and W. Celes.
-Lua---an extensible extension language.
-<em>Software: Practice & Experience</em> <b>26</b> #6 (1996) 635-652.
-<li>
-L. H. de Figueiredo, R. Ierusalimschy, and W. Celes.
-The design and implementation of a language for extending applications.
-<em>Proceedings of XXI Brazilian Seminar on Software and Hardware</em> (1994) 273-283.
-<li>
-L. H. de Figueiredo, R. Ierusalimschy, and W. Celes.
-Lua: an extensible embedded language.
-<em>Dr. Dobb's Journal</em> <b>21</b> #12 (Dec 1996) 26-33.
-<li>
-R. Ierusalimschy, L. H. de Figueiredo, and W. Celes.
-The evolution of an extension language: a history of Lua,
-<em>Proceedings of V Brazilian Symposium on Programming Languages</em> (2001) B-14-B-28.
-</ul>
-
-<p>Lua means "moon" in Portuguese and is pronounced LOO-ah.
-
-<p>
-<a name="language"><a name="2"><h1>2 - The Language</h1></a></a>
-
-<p>This section describes the lexis, the syntax, and the semantics of Lua.
-In other words,
-this section describes
-which tokens are valid,
-how they can be combined,
-and what their combinations mean.
-
-<p>The language constructs will be explained using the usual extended BNF,
-in which
-{<em>a</em>} means 0 or more <em>a</em>'s, and
-[<em>a</em>] means an optional <em>a</em>.
-Non-terminals are shown in <em>italics</em>,
-keywords are shown in <b>bold</b>,
-and other terminal symbols are shown in <code>typewriter</code> font,
-enclosed in single quotes.
-
-<p><a name="lexical"><a name="2.1"><h2>2.1 - Lexical Conventions</h2></a></a>
-
-<p><em>Identifiers</em> in Lua can be any string of letters,
-digits, and underscores,
-not beginning with a digit.
-This coincides with the definition of identifiers in most languages.
-(The definition of letter depends on the current locale:
-any character considered alphabetic by the current locale
-can be used in an identifier.)
-
-<p>The following <em>keywords</em> are reserved
-and cannot be used as identifiers:
-
-<PRE>
- and break do else elseif
- end false for function if
- in local nil not or
- repeat return then true until while
-</PRE>
-
-<p>Lua is a case-sensitive language:
-<code>and</code> is a reserved word, but <code>And</code> and <code>AND</code>
-are two different, valid identifiers.
-As a convention, identifiers starting with an underscore followed by
-uppercase letters (such as <code>_VERSION</code>)
-are reserved for internal variables used by Lua.
-
-<p>The following strings denote other tokens:
-<PRE>
- + - * / ^ =
- ~= <= >= < > ==
- ( ) { } [ ]
- ; : , . .. ...
-</PRE>
-
-<p><em>Literal strings</em>
-can be delimited by matching single or double quotes,
-and can contain the following C-like escape sequences:
-<ul>
-<li><b><code>\a</code></b> --- bell
-<li><b><code>\b</code></b> --- backspace
-<li><b><code>\f</code></b> --- form feed
-<li><b><code>\n</code></b> --- newline
-<li><b><code>\r</code></b> --- carriage return
-<li><b><code>\t</code></b> --- horizontal tab
-<li><b><code>\v</code></b> --- vertical tab
-<li><b><code>\\</code></b> --- backslash
-<li><b><code>\"</code></b> --- quotation mark
-<li><b><code>\'</code></b> --- apostrophe
-<li><b><code>\[</code></b> --- left square bracket
-<li><b><code>\]</code></b> --- right square bracket
-</ul>
-Moreover, a `<code>\</code><em>newline</em>´
-(that is, a backslash followed by a real newline)
-results in a newline in the string.
-A character in a string may also be specified by its numerical value
-using the escape sequence `<code>\</code><em>ddd</em>´,
-where <em>ddd</em> is a sequence of up to three decimal digits.
-Strings in Lua may contain any 8-bit value, including embedded zeros,
-which can be specified as `<code>\0</code>´.
-
-<p>Literal strings can also be delimited by matching double square brackets
-<code>[[</code> · · · <code>]]</code>.
-Literals in this bracketed form may run for several lines,
-may contain nested <code>[[</code> · · · <code>]]</code> pairs,
-and do not interpret any escape sequences.
-For convenience,
-when the opening `<code>[[</code>´ is immediately followed by a newline,
-the newline is not included in the string.
-As an example, in a system using ASCII
-(in which `<code>a</code>´ is coded as 97,
-newline is coded as 10, and `<code>1</code>´ is coded as 49),
-the four literals below denote the same string:
-<PRE>
- (1) "alo\n123\""
- (2) '\97lo\10\04923"'
- (3) [[alo
- 123"]]
- (4) [[
- alo
- 123"]]
-</PRE>
-
-<p><em>Numerical constants</em> may be written with an optional decimal part
-and an optional decimal exponent.
-Examples of valid numerical constants are
-<PRE>
- 3 3.0 3.1416 314.16e-2 0.31416E1
-</PRE>
-
-<p><em>Comments</em> start anywhere outside a string with a
-double hyphen (<code>--</code>).
-If the text immediately after <code>--</code> is different from <code>[[</code>,
-the comment is a <em>short comment</em>,
-which runs until the end of the line.
-Otherwise, it is a <em>long comment</em>,
-which runs until the corresponding <code>]]</code>.
-Long comments may run for several lines
-and may contain nested <code>[[</code> · · · <code>]]</code> pairs.
-
-<p>For convenience,
-the first line of a chunk is skipped if it starts with <code>#</code>.
-This facility allows the use of Lua as a script interpreter
-in Unix systems (see <a href="#lua-sa">6</a>).
-
-<p><a name="TypesSec"><a name="2.2"><h2>2.2 - Values and Types</h2></a></a>
-
-<p>Lua is a <em>dynamically typed language</em>.
-That means that
-variables do not have types; only values do.
-There are no type definitions in the language.
-All values carry their own type.
-
-<p>There are eight basic types in Lua:
-<em>nil</em>, <em>boolean</em>, <em>number</em>,
-<em>string</em>, <em>function</em>, <em>userdata</em>, <em>thread</em>, and <em>table</em>.
-<em>Nil</em> is the type of the value <B>nil</B>,
-whose main property is to be different from any other value;
-usually it represents the absence of a useful value.
-<em>Boolean</em> is the type of the values <B>false</B> and <B>true</B>.
-In Lua, both <B>nil</B> and <B>false</B> make a condition false;
-any other value makes it true.
-<em>Number</em> represents real (double-precision floating-point) numbers.
-(It is easy to build Lua interpreters that use other
-internal representations for numbers,
-such as single-precision float or long integers.)
-<em>String</em> represents arrays of characters.
-
-Lua is 8-bit clean:
-Strings may contain any 8-bit character,
-including embedded zeros (<code>'\0'</code>) (see <a href="#lexical">2.1</a>).
-
-<p>Functions are <em>first-class values</em> in Lua.
-That means that functions can be stored in variables,
-passed as arguments to other functions, and returned as results.
-Lua can call (and manipulate) functions written in Lua and
-functions written in C
-(see <a href="#functioncall">2.5.7</a>).
-
-<p>The type <em>userdata</em> is provided to allow arbitrary C data to
-be stored in Lua variables.
-This type corresponds to a block of raw memory
-and has no pre-defined operations in Lua,
-except assignment and identity test.
-However, by using <em>metatables</em>,
-the programmer can define operations for userdata values
-(see <a href="#metatable">2.8</a>).
-Userdata values cannot be created or modified in Lua,
-only through the C API.
-This guarantees the integrity of data owned by the host program.
-
-<p>The type <em>thread</em> represents independent threads of execution
-and it is used to implement coroutines.
-
-<p>The type <em>table</em> implements associative arrays,
-that is, arrays that can be indexed not only with numbers,
-but with any value (except <B>nil</B>).
-Moreover,
-tables can be <em>heterogeneous</em>,
-that is, they can contain values of all types (except <B>nil</B>).
-Tables are the sole data structuring mechanism in Lua;
-they may be used to represent ordinary arrays,
-symbol tables, sets, records, graphs, trees, etc.
-To represent records, Lua uses the field name as an index.
-The language supports this representation by
-providing <code>a.name</code> as syntactic sugar for <code>a["name"]</code>.
-There are several convenient ways to create tables in Lua
-(see <a href="#tableconstructor">2.5.6</a>).
-
-<p>Like indices,
-the value of a table field can be of any type (except <B>nil</B>).
-In particular,
-because functions are first class values,
-table fields may contain functions.
-Thus tables may also carry <em>methods</em> (see <a href="#func-def">2.5.8</a>).
-
-<p>Tables, functions, and userdata values are <em>objects</em>:
-variables do not actually <em>contain</em> these values,
-only <em>references</em> to them.
-Assignment, parameter passing, and function returns
-always manipulate references to such values;
-these operations do not imply any kind of copy.
-
-<p>The library function <code>type</code> returns a string describing the type
-of a given value (see <a href="#pdf-type">5.1</a>).
-
-<p><a name="coercion"><a name="2.2.1"><h3>2.2.1 - Coercion</h3></a></a>
-
-<p>Lua provides automatic conversion between
-string and number values at run time.
-Any arithmetic operation applied to a string tries to convert
-that string to a number, following the usual rules.
-Conversely, whenever a number is used where a string is expected,
-the number is converted to a string, in a reasonable format.
-For complete control of how numbers are converted to strings,
-use the <code>format</code> function from the string library (see <a href="#format">5.3</a>).
-
-<p><a name="variables"><a name="2.3"><h2>2.3 - Variables</h2></a></a>
-
-<p>Variables are places that store values.
-
-There are three kinds of variables in Lua:
-global variables, local variables, and table fields.
-
-<p>A single name can denote a global variable or a local variable
-(or a formal parameter of a function,
-which is a particular form of local variable):
-<pre>
- var ::= Name
-</pre>
-Variables are assumed to be global unless explicitly declared local
-(see <a href="#localvar">2.4.7</a>).
-Local variables are <em>lexically scoped</em>:
-Local variables can be freely accessed by functions
-defined inside their scope (see <a href="#visibility">2.6</a>).
-
-<p>Before the first assignment to a variable, its value is <B>nil</B>.
-
-<p>Square brackets are used to index a table:
-<pre>
- var ::= prefixexp `<b>[</b>´ exp `<b>]</b>´
-</pre>
-The first expression (<em>prefixexp</em>)should result in a table value;
-the second expression (<em>exp</em>)
-identifies a specific entry inside that table.
-The expression denoting the table to be indexed has a restricted syntax;
-see <a href="#expressions">2.5</a> for details.
-
-<p>The syntax <code>var.NAME</code> is just syntactic sugar for
-<code>var["NAME"]</code>:
-<pre>
- var ::= prefixexp `<b>.</b>´ Name
-</pre>
-
-<p>The meaning of accesses to global variables
-and table fields can be changed via metatables.
-An access to an indexed variable <code>t[i]</code> is equivalent to
-a call <code>gettable_event(t,i)</code>.
-(See <a href="#metatable">2.8</a> for a complete description of the
-<code>gettable_event</code> function.
-This function is not defined or callable in Lua.
-We use it here only for explanatory purposes.)
-
-<p>All global variables live as fields in ordinary Lua tables,
-called <em>environment tables</em> or simply <em>environments</em>.
-Functions written in C and exported to Lua (<em>C functions</em>)
-all share a common <em>global environment</em>.
-Each function written in Lua (a <em>Lua function</em>)
-has its own reference to an environment,
-so that all global variables in that function
-will refer to that environment table.
-When a function is created,
-it inherits the environment from the function that created it.
-To change or get the environment table of a Lua function,
-you call <code>setfenv</code> or <code>getfenv</code> (see <a href="#setfenv">5.1</a>).
-
-<p>An access to a global variable <code>x</code>
-is equivalent to <code>_env.x</code>,
-which in turn is equivalent to
-<PRE>
- gettable_event(_env, "x")
-</PRE>
-where <code>_env</code> is the environment of the running function.
-(The <code>_env</code> variable is not defined in Lua.
-We use it here only for explanatory purposes.)
-
-<p><a name="stats"><a name="2.4"><h2>2.4 - Statements</h2></a></a>
-
-<p>Lua supports an almost conventional set of statements,
-similar to those in Pascal or C.
-This set includes
-assignment, control structures, procedure calls,
-table constructors, and variable declarations.
-
-<p><a name="chunks"><a name="2.4.1"><h3>2.4.1 - Chunks</h3></a></a>
-
-<p>The unit of execution of Lua is called a <em>chunk</em>.
-A chunk is simply a sequence of statements,
-which are executed sequentially.
-Each statement can be optionally followed by a semicolon:
-<pre>
- chunk ::= {stat [`<b>;</b>´]}
-</pre>
-
-<p>Lua handles a chunk as the body of an anonymous function (see <a href="#func-def">2.5.8</a>).
-As such, chunks can define local variables and return values.
-
-<p>A chunk may be stored in a file or in a string inside the host program.
-When a chunk is executed, first it is pre-compiled into opcodes for
-a virtual machine,
-and then the compiled code is executed
-by an interpreter for the virtual machine.
-
-<p>Chunks may also be pre-compiled into binary form;
-see program <code>luac</code> for details.
-Programs in source and compiled forms are interchangeable;
-Lua automatically detects the file type and acts accordingly.
-
-
-<p><a name="2.4.2"><h3>2.4.2 - Blocks</h3></a>
-A block is a list of statements;
-syntactically, a block is equal to a chunk:
-<pre>
- block ::= chunk
-</pre>
-
-<p>A block may be explicitly delimited to produce a single statement:
-<pre>
- stat ::= <b>do</b> block <b>end</b>
-</pre>
-Explicit blocks are useful
-to control the scope of variable declarations.
-Explicit blocks are also sometimes used to
-add a <b>return</b> or <b>break</b> statement in the middle
-of another block (see <a href="#control">2.4.4</a>).
-
-
-<p><a name="assignment"><a name="2.4.3"><h3>2.4.3 - Assignment</h3></a></a>
-
-<p>Lua allows multiple assignment.
-Therefore, the syntax for assignment
-defines a list of variables on the left side
-and a list of expressions on the right side.
-The elements in both lists are separated by commas:
-<pre>
- stat ::= varlist1 `<b>=</b>´ explist1
- varlist1 ::= var {`<b>,</b>´ var}
- explist1 ::= exp {`<b>,</b>´ exp}
-</pre>
-Expressions are discussed in <a href="#expressions">2.5</a>.
-
-<p>Before the assignment,
-the list of values is <em>adjusted</em> to the length of
-the list of variables.
-If there are more values than needed,
-the excess values are thrown away.
-If there are fewer values than needed,
-the list is extended with as many <B>nil</B>'s as needed.
-If the list of expressions ends with a function call,
-then all values returned by that function call enter in the list of values,
-before the adjustment
-(except when the call is enclosed in parentheses; see <a href="#expressions">2.5</a>).
-
-<p>The assignment statement first evaluates all its expressions
-and only then are the assignments performed.
-Thus the code
-<PRE>
- i = 3
- i, a[i] = i+1, 20
-</PRE>
-sets <code>a[3]</code> to 20, without affecting <code>a[4]</code>
-because the <code>i</code> in <code>a[i]</code> is evaluated (to 3)
-before it is assigned 4.
-Similarly, the line
-<PRE>
- x, y = y, x
-</PRE>
-exchanges the values of <code>x</code> and <code>y</code>.
-
-<p>The meaning of assignments to global variables
-and table fields can be changed via metatables.
-An assignment to an indexed variable <code>t[i] = val</code> is equivalent to
-<code>settable_event(t,i,val)</code>.
-(See <a href="#metatable">2.8</a> for a complete description of the
-<code>settable_event</code> function.
-This function is not defined or callable in Lua.
-We use it here only for explanatory purposes.)
-
-<p>An assignment to a global variable <code>x = val</code>
-is equivalent to the assignment
-<code>_env.x = val</code>,
-which in turn is equivalent to
-<PRE>
- settable_event(_env, "x", val)
-</PRE>
-where <code>_env</code> is the environment of the running function.
-(The <code>_env</code> variable is not defined in Lua.
-We use it here only for explanatory purposes.)
-
-<p><a name="control"><a name="2.4.4"><h3>2.4.4 - Control Structures</h3></a></a>
-The control structures
-<b>if</b>, <b>while</b>, and <b>repeat</b> have the usual meaning and
-familiar syntax:
-
-
-
-<pre>
- stat ::= <b>while</b> exp <b>do</b> block <b>end</b>
- stat ::= <b>repeat</b> block <b>until</b> exp
- stat ::= <b>if</b> exp <b>then</b> block {<b>elseif</b> exp <b>then</b> block} [<b>else</b> block] <b>end</b>
-</pre>
-Lua also has a <b>for</b> statement, in two flavors (see <a href="#for">2.4.5</a>).
-
-<p>The condition expression <em>exp</em> of a
-control structure may return any value.
-Both <B>false</B> and <B>nil</B> are considered false.
-All values different from <B>nil</B> and <B>false</B> are considered true
-(in particular, the number 0 and the empty string are also true).
-
-<p>The <b>return</b> statement is used to return values
-from a function or from a chunk.
-
-Functions and chunks may return more than one value,
-so the syntax for the <b>return</b> statement is
-<pre>
- stat ::= <b>return</b> [explist1]
-</pre>
-
-<p>The <b>break</b> statement can be used to terminate the execution of a
-<b>while</b>, <b>repeat</b>, or <b>for</b> loop,
-skipping to the next statement after the loop:
-
-<pre>
- stat ::= <b>break</b>
-</pre>
-A <b>break</b> ends the innermost enclosing loop.
-
-<p>For syntactic reasons, <b>return</b> and <b>break</b>
-statements can only be written as the <em>last</em> statement of a block.
-If it is really necessary to <b>return</b> or <b>break</b> in the
-middle of a block,
-then an explicit inner block can be used,
-as in the idioms
-`<code>do return end</code>´ and
-`<code>do break end</code>´,
-because now <b>return</b> and <b>break</b> are the last statements in
-their (inner) blocks.
-In practice,
-those idioms are only used during debugging.
-
-<p><a name="for"><a name="2.4.5"><h3>2.4.5 - For Statement</h3></a></a>
-
-<p>The <b>for</b> statement has two forms:
-one numeric and one generic.
-
-
-<p>The numeric <b>for</b> loop repeats a block of code while a
-control variable runs through an arithmetic progression.
-It has the following syntax:
-<pre>
- stat ::= <b>for</b> Name `<b>=</b>´ exp `<b>,</b>´ exp [`<b>,</b>´ exp] <b>do</b> block <b>end</b>
-</pre>
-The <em>block</em> is repeated for <em>name</em> starting at the value of
-the first <em>exp</em>, until it passes the second <em>exp</em> by steps of the
-third <em>exp</em>.
-More precisely, a <b>for</b> statement like
-<PRE>
- for var = e1, e2, e3 do block end
-</PRE>
-is equivalent to the code:
-<PRE>
- do
- local var, _limit, _step = tonumber(e1), tonumber(e2), tonumber(e3)
- if not (var and _limit and _step) then error() end
- while (_step>0 and var<=_limit) or (_step<=0 and var>=_limit) do
- block
- var = var + _step
- end
- end
-</PRE>
-Note the following:
-<ul>
-<li> All three control expressions are evaluated only once,
-before the loop starts.
-They must all result in numbers.
-<li> <code>_limit</code> and <code>_step</code> are invisible variables.
-The names are here for explanatory purposes only.
-<li> The behavior is <em>undefined</em> if you assign to <code>var</code> inside
-the block.
-<li> If the third expression (the step) is absent, then a step of 1 is used.
-<li> You can use <b>break</b> to exit a <b>for</b> loop.
-<li> The loop variable <code>var</code> is local to the statement;
-you cannot use its value after the <b>for</b> ends or is broken.
-If you need the value of the loop variable <code>var</code>,
-then assign it to another variable before breaking or exiting the loop.
-</ul>
-
-<p>The generic <b>for</b> statement works over functions,
-called <em>iterators</em>.
-For each iteration, it calls its iterator function to produce a new value,
-stopping when the new value is <B>nil</B>.
-The generic <b>for</b> loop has the following syntax:
-<pre>
- stat ::= <b>for</b> Name {`<b>,</b>´ Name} <b>in</b> explist1 <b>do</b> block <b>end</b>
-</pre>
-A <b>for</b> statement like
-<PRE>
- for var_1, ..., var_n in explist do block end
-</PRE>
-is equivalent to the code:
-<PRE>
- do
- local _f, _s, var_1 = explist
- local var_2, ... , var_n
- while true do
- var_1, ..., var_n = _f(_s, var_1)
- if var_1 == nil then break end
- block
- end
- end
-</PRE>
-Note the following:
-<ul>
-<li> <code>explist</code> is evaluated only once.
-Its results are an <em>iterator</em> function,
-a <em>state</em>, and an initial value for the first <em>iterator variable</em>.
-<li> <code>_f</code> and <code>_s</code> are invisible variables.
-The names are here for explanatory purposes only.
-<li> The behavior is <em>undefined</em> if you assign to
-<code>var_1</code> inside the block.
-<li> You can use <b>break</b> to exit a <b>for</b> loop.
-<li> The loop variables <code>var_i</code> are local to the statement;
-you cannot use their values after the <b>for</b> ends.
-If you need these values,
-then assign them to other variables before breaking or exiting the loop.
-</ul>
-
-<p><a name="funcstat"><a name="2.4.6"><h3>2.4.6 - Function Calls as Statements</h3></a></a>
-To allow possible side-effects,
-function calls can be executed as statements:
-<pre>
- stat ::= functioncall
-</pre>
-In this case, all returned values are thrown away.
-Function calls are explained in <a href="#functioncall">2.5.7</a>.
-
-<p><a name="localvar"><a name="2.4.7"><h3>2.4.7 - Local Declarations</h3></a></a>
-Local variables may be declared anywhere inside a block.
-The declaration may include an initial assignment:
-<pre>
- stat ::= <b>local</b> namelist [`<b>=</b>´ explist1]
- namelist ::= Name {`<b>,</b>´ Name}
-</pre>
-If present, an initial assignment has the same semantics
-of a multiple assignment (see <a href="#assignment">2.4.3</a>).
-Otherwise, all variables are initialized with <B>nil</B>.
-
-<p>A chunk is also a block (see <a href="#chunks">2.4.1</a>),
-so local variables can be declared in a chunk outside any explicit block.
-Such local variables die when the chunk ends.
-
-<p>The visibility rules for local variables are explained in <a href="#visibility">2.6</a>.
-
-<p><a name="expressions"><a name="2.5"><h2>2.5 - Expressions</h2></a></a>
-
-<p>
-The basic expressions in Lua are the following:
-<pre>
- exp ::= prefixexp
- exp ::= <b>nil</b> | <b>false</b> | <b>true</b>
- exp ::= Number
- exp ::= Literal
- exp ::= function
- exp ::= tableconstructor
- prefixexp ::= var | functioncall | `<b>(</b>´ exp `<b>)</b>´
-</pre>
-
-<p>Numbers and literal strings are explained in <a href="#lexical">2.1</a>;
-variables are explained in <a href="#variables">2.3</a>;
-function definitions are explained in <a href="#func-def">2.5.8</a>;
-function calls are explained in <a href="#functioncall">2.5.7</a>;
-table constructors are explained in <a href="#tableconstructor">2.5.6</a>.
-
-
-<p>An expression enclosed in parentheses always results in only one value.
-Thus,
-<code>(f(x,y,z))</code> is always a single value,
-even if <code>f</code> returns several values.
-(The value of <code>(f(x,y,z))</code> is the first value returned by <code>f</code>
-or <B>nil</B> if <code>f</code> does not return any values.)
-
-<p>Expressions can also be built with arithmetic operators, relational operators,
-and logical operators, all of which are explained below.
-
-<p><a name="2.5.1"><h3>2.5.1 - Arithmetic Operators</h3></a>
-Lua supports the usual arithmetic operators:
-the binary <code>+</code> (addition),
-<code>-</code> (subtraction), <code>*</code> (multiplication),
-<code>/</code> (division), and <code>^</code> (exponentiation);
-and unary <code>-</code> (negation).
-If the operands are numbers, or strings that can be converted to
-numbers (see <a href="#coercion">2.2.1</a>),
-then all operations except exponentiation have the usual meaning.
-Exponentiation calls a global function <code>__pow</code>;
-otherwise, an appropriate metamethod is called (see <a href="#metatable">2.8</a>).
-The standard mathematical library defines function <code>__pow</code>,
-giving the expected meaning to exponentiation
-(see <a href="#mathlib">5.5</a>).
-
-<p><a name="rel-ops"><a name="2.5.2"><h3>2.5.2 - Relational Operators</h3></a></a>
-The relational operators in Lua are
-<PRE>
- == ~= < > <= >=
-</PRE>
-These operators always result in <B>false</B> or <B>true</B>.
-
-<p>Equality (<code>==</code>) first compares the type of its operands.
-If the types are different, then the result is <B>false</B>.
-Otherwise, the values of the operands are compared.
-Numbers and strings are compared in the usual way.
-Objects (tables, userdata, threads, and functions)
-are compared by <em>reference</em>:
-Two objects are considered equal only if they are the <em>same</em> object.
-Every time you create a new object (a table, userdata, or function),
-this new object is different from any previously existing object.
-
-<p>You can change the way that Lua compares tables and userdata
-using the "eq" metamethod (see <a href="#metatable">2.8</a>).
-
-<p>The conversion rules of <a href="#coercion">2.2.1</a>
-<em>do not</em> apply to equality comparisons.
-Thus, <code>"0"==0</code> evaluates to <B>false</B>,
-and <code>t[0]</code> and <code>t["0"]</code> denote different
-entries in a table.
-
-
-<p>The operator <code>~=</code> is exactly the negation of equality (<code>==</code>).
-
-<p>The order operators work as follows.
-If both arguments are numbers, then they are compared as such.
-Otherwise, if both arguments are strings,
-then their values are compared according to the current locale.
-Otherwise, Lua tries to call the "lt" or the "le"
-metamethod (see <a href="#metatable">2.8</a>).
-
-<p><a name="2.5.3"><h3>2.5.3 - Logical Operators</h3></a>
-The logical operators in Lua are
-
-<PRE>
- and or not
-</PRE>
-Like the control structures (see <a href="#control">2.4.4</a>),
-all logical operators consider both <B>false</B> and <B>nil</B> as false
-and anything else as true.
-
-
-<p>The operator <b>not</b> always return <B>false</B> or <B>true</B>.
-
-<p>The conjunction operator <b>and</b> returns its first argument
-if this value is <B>false</B> or <B>nil</B>;
-otherwise, <b>and</b> returns its second argument.
-The disjunction operator <b>or</b> returns its first argument
-if this value is different from <B>nil</B> and <B>false</B>;
-otherwise, <b>or</b> returns its second argument.
-Both <b>and</b> and <b>or</b> use short-cut evaluation,
-that is,
-the second operand is evaluated only if necessary.
-For example,
-<PRE>
- 10 or error() -> 10
- nil or "a" -> "a"
- nil and 10 -> nil
- false and error() -> false
- false and nil -> false
- false or nil -> nil
- 10 and 20 -> 20
-</PRE>
-
-<p><a name="concat"><a name="2.5.4"><h3>2.5.4 - Concatenation</h3></a></a>
-The string concatenation operator in Lua is
-denoted by two dots (`<code>..</code>´).
-If both operands are strings or numbers, then they are converted to
-strings according to the rules mentioned in <a href="#coercion">2.2.1</a>.
-Otherwise, the "concat" metamethod is called (see <a href="#metatable">2.8</a>).
-
-<p><a name="2.5.5"><h3>2.5.5 - Precedence</h3></a>
-Operator precedence in Lua follows the table below,
-from lower to higher priority:
-<PRE>
- or
- and
- < > <= >= ~= ==
- ..
- + -
- * /
- not - (unary)
- ^
-</PRE>
-You can use parentheses to change the precedences in an expression.
-The concatenation (`<code>..</code>´) and exponentiation (`<code>^</code>´)
-operators are right associative.
-All other binary operators are left associative.
-
-<p><a name="tableconstructor"><a name="2.5.6"><h3>2.5.6 - Table Constructors</h3></a></a>
-Table constructors are expressions that create tables.
-Every time a constructor is evaluated, a new table is created.
-Constructors can be used to create empty tables,
-or to create a table and initialize some of its fields.
-The general syntax for constructors is
-<pre>
- tableconstructor ::= `<b>{</b>´ [fieldlist] `<b>}</b>´
- fieldlist ::= field {fieldsep field} [fieldsep]
- field ::= `<b>[</b>´ exp `<b>]</b>´ `<b>=</b>´ exp | Name `<b>=</b>´ exp | exp
- fieldsep ::= `<b>,</b>´ | `<b>;</b>´
-</pre>
-
-<p>Each field of the form <code>[exp1] = exp2</code> adds to the new table an entry
-with key <code>exp1</code> and value <code>exp2</code>.
-A field of the form <code>name = exp</code> is equivalent to
-<code>["name"] = exp</code>.
-Finally, fields of the form <code>exp</code> are equivalent to
-<code>[i] = exp</code>, where <code>i</code> are consecutive numerical integers,
-starting with 1.
-Fields in the other formats do not affect this counting.
-For example,
-<PRE>
- a = {[f(1)] = g; "x", "y"; x = 1, f(x), [30] = 23; 45}
-</PRE>
-is equivalent to
-<PRE>
- do
- local temp = {}
- temp[f(1)] = g
- temp[1] = "x" -- 1st exp
- temp[2] = "y" -- 2nd exp
- temp.x = 1 -- temp["x"] = 1
- temp[3] = f(x) -- 3rd exp
- temp[30] = 23
- temp[4] = 45 -- 4th exp
- a = temp
- end
-</PRE>
-
-<p>If the last field in the list has the form <code>exp</code>
-and the expression is a function call,
-then all values returned by the call enter the list consecutively
-(see <a href="#functioncall">2.5.7</a>).
-To avoid this,
-enclose the function call in parentheses (see <a href="#expressions">2.5</a>).
-
-<p>The field list may have an optional trailing separator,
-as a convenience for machine-generated code.
-
-<p><a name="functioncall"><a name="2.5.7"><h3>2.5.7 - Function Calls</h3></a></a>
-A function call in Lua has the following syntax:
-<pre>
- functioncall ::= prefixexp args
-</pre>
-In a function call,
-first <em>prefixexp</em> and <em>args</em> are evaluated.
-If the value of <em>prefixexp</em> has type <em>function</em>,
-then that function is called
-with the given arguments.
-Otherwise, its "call" metamethod is called,
-having as first parameter the value of <em>prefixexp</em>,
-followed by the original call arguments
-(see <a href="#metatable">2.8</a>).
-
-<p>The form
-<pre>
- functioncall ::= prefixexp `<b>:</b>´ Name args
-</pre>
-can be used to call "methods".
-A call <code>v:name(...)</code>
-is syntactic sugar for <code>v.name(v,...)</code>,
-except that <code>v</code> is evaluated only once.
-
-<p>Arguments have the following syntax:
-<pre>
- args ::= `<b>(</b>´ [explist1] `<b>)</b>´
- args ::= tableconstructor
- args ::= Literal
-</pre>
-All argument expressions are evaluated before the call.
-A call of the form <code>f{...}</code> is syntactic sugar for
-<code>f({...})</code>, that is,
-the argument list is a single new table.
-A call of the form <code>f'...'</code>
-(or <code>f"..."</code> or <code>f[[...]]</code>) is syntactic sugar for
-<code>f('...')</code>, that is,
-the argument list is a single literal string.
-
-<p>Because a function can return any number of results
-(see <a href="#control">2.4.4</a>),
-the number of results must be adjusted before they are used.
-If the function is called as a statement (see <a href="#funcstat">2.4.6</a>),
-then its return list is adjusted to zero elements,
-thus discarding all returned values.
-If the function is called inside another expression
-or in the middle of a list of expressions,
-then its return list is adjusted to one element,
-thus discarding all returned values except the first one.
-If the function is called as the last element of a list of expressions,
-then no adjustment is made
-(unless the call is enclosed in parentheses).
-
-<p>Here are some examples:
-<PRE>
- f() -- adjusted to 0 results
- g(f(), x) -- f() is adjusted to 1 result
- g(x, f()) -- g gets x plus all values returned by f()
- a,b,c = f(), x -- f() is adjusted to 1 result (and c gets nil)
- a,b,c = x, f() -- f() is adjusted to 2 results
- a,b,c = f() -- f() is adjusted to 3 results
- return f() -- returns all values returned by f()
- return x,y,f() -- returns x, y, and all values returned by f()
- {f()} -- creates a list with all values returned by f()
- {f(), nil} -- f() is adjusted to 1 result
-</PRE>
-
-<p>If you enclose a function call in parentheses,
-then it is adjusted to return exactly one value:
-<PRE>
- return x,y,(f()) -- returns x, y, and the first value from f()
- {(f())} -- creates a table with exactly one element
-</PRE>
-
-<p>As an exception to the free-format syntax of Lua,
-you cannot put a line break before the `<code>(</code>´ in a function call.
-That restriction avoids some ambiguities in the language.
-If you write
-<PRE>
- a = f
- (g).x(a)
-</PRE>
-Lua would read that as <code>a = f(g).x(a)</code>.
-So, if you want two statements, you must add a semi-colon between them.
-If you actually want to call <code>f</code>,
-you must remove the line break before <code>(g)</code>.
-
-<p>A call of the form <code>return</code> <em>functioncall</em> is called
-a <em>tail call</em>.
-Lua implements <em>proper tail calls</em>
-(or <em>proper tail recursion</em>):
-In a tail call,
-the called function reuses the stack entry of the calling function.
-Therefore, there is no limit on the number of nested tail calls that
-a program can execute.
-However, a tail call erases any debug information about the
-calling function.
-Note that a tail call only happens with a particular syntax,
-where the <b>return</b> has one single function call as argument;
-this syntax makes the calling function returns exactly
-the returns of the called function.
-So, all the following examples are not tails calls:
-<PRE>
- return (f(x)) -- results adjusted to 1
- return 2 * f(x)
- return x, f(x) -- additional results
- f(x); return -- results discarded
- return x or f(x) -- results adjusted to 1
-</PRE>
-
-<p><a name="func-def"><a name="2.5.8"><h3>2.5.8 - Function Definitions</h3></a></a>
-
-<p>The syntax for function definition is
-<pre>
- function ::= <b>function</b> funcbody
- funcbody ::= `<b>(</b>´ [parlist1] `<b>)</b>´ block <b>end</b>
-</pre>
-
-<p>The following syntactic sugar simplifies function definitions:
-<pre>
- stat ::= <b>function</b> funcname funcbody
- stat ::= <b>local</b> <b>function</b> Name funcbody
- funcname ::= Name {`<b>.</b>´ Name} [`<b>:</b>´ Name]
-</pre>
-The statement
-<PRE>
- function f () ... end
-</PRE>
-translates to
-<PRE>
- f = function () ... end
-</PRE>
-The statement
-<PRE>
- function t.a.b.c.f () ... end
-</PRE>
-translates to
-<PRE>
- t.a.b.c.f = function () ... end
-</PRE>
-The statement
-<PRE>
- local function f () ... end
-</PRE>
-translates to
-<PRE>
- local f; f = function () ... end
-</PRE>
-
-<p>A function definition is an executable expression,
-whose value has type <em>function</em>.
-When Lua pre-compiles a chunk,
-all its function bodies are pre-compiled too.
-Then, whenever Lua executes the function definition,
-the function is <em>instantiated</em> (or <em>closed</em>).
-This function instance (or <em>closure</em>)
-is the final value of the expression.
-Different instances of the same function
-may refer to different external local variables
-and may have different environment tables.
-
-<p>Parameters act as local variables that are
-initialized with the argument values:
-<pre>
- parlist1 ::= namelist [`<b>,</b>´ `<b>...</b>´]
- parlist1 ::= `<b>...</b>´
-</pre>
-When a function is called,
-the list of arguments is adjusted to
-the length of the list of parameters,
-unless the function is a variadic or <em>vararg function</em>,
-which is
-indicated by three dots (`<code>...</code>´) at the end of its parameter list.
-A vararg function does not adjust its argument list;
-instead, it collects all extra arguments into an implicit parameter,
-called <code>arg</code>.
-The value of <a name="vararg"><code>arg</code></a> is a table,
-with a field <code>n</code> that holds the number of extra arguments
-and with the extra arguments at positions 1, 2, ..., <code>n</code>.
-
-<p>As an example, consider the following definitions:
-<PRE>
- function f(a, b) end
- function g(a, b, ...) end
- function r() return 1,2,3 end
-</PRE>
-Then, we have the following mapping from arguments to parameters:
-<PRE>
- CALL PARAMETERS
-
- f(3) a=3, b=nil
- f(3, 4) a=3, b=4
- f(3, 4, 5) a=3, b=4
- f(r(), 10) a=1, b=10
- f(r()) a=1, b=2
-
- g(3) a=3, b=nil, arg={n=0}
- g(3, 4) a=3, b=4, arg={n=0}
- g(3, 4, 5, 8) a=3, b=4, arg={5, 8; n=2}
- g(5, r()) a=5, b=1, arg={2, 3; n=2}
-</PRE>
-
-<p>Results are returned using the <b>return</b> statement (see <a href="#control">2.4.4</a>).
-If control reaches the end of a function
-without encountering a <b>return</b> statement,
-then the function returns with no results.
-
-<p>The <em>colon</em> syntax
-is used for defining <em>methods</em>,
-that is, functions that have an implicit extra parameter <code>self</code>.
-Thus, the statement
-<PRE>
- function t.a.b.c:f (...) ... end
-</PRE>
-is syntactic sugar for
-<PRE>
- t.a.b.c.f = function (self, ...) ... end
-</PRE>
-
-<p><a name="visibility"><a name="2.6"><h2>2.6 - Visibility Rules</h2></a></a>
-
-
-<p>Lua is a lexically scoped language.
-The scope of variables begins at the first statement <em>after</em>
-their declaration and lasts until the end of the innermost block that
-includes the declaration.
-For instance:
-<PRE>
- x = 10 -- global variable
- do -- new block
- local x = x -- new `x', with value 10
- print(x) --> 10
- x = x+1
- do -- another block
- local x = x+1 -- another `x'
- print(x) --> 12
- end
- print(x) --> 11
- end
- print(x) --> 10 (the global one)
-</PRE>
-Notice that, in a declaration like <code>local x = x</code>,
-the new <code>x</code> being declared is not in scope yet,
-and so the second <code>x</code> refers to the outside variable.
-
-<p>Because of the lexical scoping rules,
-local variables can be freely accessed by functions
-defined inside their scope.
-For instance:
-<PRE>
- local counter = 0
- function inc (x)
- counter = counter + x
- return counter
- end
-</PRE>
-A local variable used by an inner function is called
-an <em>upvalue</em>, or <em>external local variable</em>,
-inside the inner function.
-
-<p>Notice that each execution of a <b>local</b> statement
-defines new local variables.
-Consider the following example:
-<PRE>
- a = {}
- local x = 20
- for i=1,10 do
- local y = 0
- a[i] = function () y=y+1; return x+y end
- end
-</PRE>
-The loop creates ten closures
-(that is, ten instances of the anonymous function).
-Each of these closures uses a different <code>y</code> variable,
-while all of them share the same <code>x</code>.
-
-<p><a name="error"><a name="2.7"><h2>2.7 - Error Handling</h2></a></a>
-
-<p>Because Lua is an extension language,
-all Lua actions start from C code in the host program
-calling a function from the Lua library (see <a href="#lua_pcall">3.15</a>).
-Whenever an error occurs during Lua compilation or execution,
-control returns to C,
-which can take appropriate measures
-(such as print an error message).
-
-<p>Lua code can explicitly generate an error by calling the
-<code>error</code> function (see <a href="#pdf-error">5.1</a>).
-If you need to catch errors in Lua,
-you can use the <code>pcall</code> function (see <a href="#pdf-pcall">5.1</a>).
-
-<p><a name="metatable"><a name="2.8"><h2>2.8 - Metatables</h2></a></a>
-
-<p>Every table and userdata object in Lua may have a <em>metatable</em>.
-This <em>metatable</em> is an ordinary Lua table
-that defines the behavior of the original table and userdata
-under certain special operations.
-You can change several aspects of the behavior
-of an object by setting specific fields in its metatable.
-For instance, when an object is the operand of an addition,
-Lua checks for a function in the field <code>"__add"</code> in its metatable.
-If it finds one,
-Lua calls that function to perform the addition.
-
-<p>We call the keys in a metatable <em>events</em>
-and the values <em>metamethods</em>.
-In the previous example, the event is <code>"add"</code>
-and the metamethod is the function that performs the addition.
-
-<p>You can query and change the metatable of an object
-through the <code>set/getmetatable</code>
-functions (see <a href="#pdf-getmetatable">5.1</a>).
-
-<p>A metatable may control how an object behaves in arithmetic operations,
-order comparisons, concatenation, and indexing.
-A metatable can also define a function to be called when a userdata
-is garbage collected.
-For each of those operations Lua associates a specific key
-called an <em>event</em>.
-When Lua performs one of those operations over a table or a userdata,
-it checks whether that object has a metatable with the corresponding event.
-If so, the value associated with that key (the <em>metamethod</em>)
-controls how Lua will perform the operation.
-
-<p>Metatables control the operations listed next.
-Each operation is identified by its corresponding name.
-The key for each operation is a string with its name prefixed by
-two underscores;
-for instance, the key for operation "add" is the
-string <code>"__add"</code>.
-The semantics of these operations is better explained by a Lua function
-describing how the interpreter executes that operation.
-
-<p>The code shown here in Lua is only illustrative;
-the real behavior is hard coded in the interpreter
-and it is much more efficient than this simulation.
-All functions used in these descriptions
-(<code>rawget</code>, <code>tonumber</code>, etc.)
-are described in <a href="#predefined">5.1</a>.
-In particular, to retrieve the metamethod of a given object,
-we use the expression
-<PRE>
- metatable(obj)[event]
-</PRE>
-This should be read as
-<PRE>
- rawget(metatable(obj) or {}, event)
-</PRE>
-That is, the access to a metamethod does not invoke other metamethods,
-and the access to objects with no metatables does not fail
-(it simply results in <B>nil</B>).
-
-<p><ul>
-
-<p><li><b>"add":</b>
-the <code>+</code> operation.
-
-<p>The function <code>getbinhandler</code> below defines how Lua chooses a handler
-for a binary operation.
-First, Lua tries the first operand.
-If its type does not define a handler for the operation,
-then Lua tries the second operand.
-<PRE>
- function getbinhandler (op1, op2, event)
- return metatable(op1)[event] or metatable(op2)[event]
- end
-</PRE>
-Using that function,
-the behavior of the <code>op1 + op2</code> is
-<PRE>
- function add_event (op1, op2)
- local o1, o2 = tonumber(op1), tonumber(op2)
- if o1 and o2 then -- both operands are numeric?
- return o1 + o2 -- `+' here is the primitive `add'
- else -- at least one of the operands is not numeric
- local h = getbinhandler(op1, op2, "__add")
- if h then
- -- call the handler with both operands
- return h(op1, op2)
- else -- no handler available: default behavior
- error("...")
- end
- end
- end
-</PRE>
-
-<p><li><b>"sub":</b>
-the <code>-</code> operation.
-Behavior similar to the "add" operation.
-
-<p><li><b>"mul":</b>
-the <code>*</code> operation.
-Behavior similar to the "add" operation.
-
-<p><li><b>"div":</b>
-the <code>/</code> operation.
-Behavior similar to the "add" operation.
-
-<p><li><b>"pow":</b>
-the <code>^</code> (exponentiation) operation.
-<PRE>
- function pow_event (op1, op2)
- local o1, o2 = tonumber(op1), tonumber(op2)
- if o1 and o2 then -- both operands are numeric?
- return __pow(o1, o2) -- call global `__pow'
- else -- at least one of the operands is not numeric
- local h = getbinhandler(op1, op2, "__pow")
- if h then
- -- call the handler with both operands
- return h(op1, op2)
- else -- no handler available: default behavior
- error("...")
- end
- end
- end
-</PRE>
-
-<p><li><b>"unm":</b>
-the unary <code>-</code> operation.
-<PRE>
- function unm_event (op)
- local o = tonumber(op)
- if o then -- operand is numeric?
- return -o -- `-' here is the primitive `unm'
- else -- the operand is not numeric.
- -- Try to get a handler from the operand
- local h = metatable(op).__unm
- if h then
- -- call the handler with the operand and nil
- return h(op, nil)
- else -- no handler available: default behavior
- error("...")
- end
- end
- end
-</PRE>
-
-<p><li><b>"concat":</b>
-the <code>..</code> (concatenation) operation.
-<PRE>
- function concat_event (op1, op2)
- if (type(op1) == "string" or type(op1) == "number") and
- (type(op2) == "string" or type(op2) == "number") then
- return op1 .. op2 -- primitive string concatenation
- else
- local h = getbinhandler(op1, op2, "__concat")
- if h then
- return h(op1, op2)
- else
- error("...")
- end
- end
- end
-</PRE>
-
-<p><li><b>"eq":</b>
-the <code>==</code> operation.
-The function <code>getcomphandler</code> defines how Lua chooses a metamethod
-for comparison operators.
-A metamethod only is selected when both objects
-being compared have the same type
-and the same metamethod for the selected operation.
-<PRE>
- function getcomphandler (op1, op2, event)
- if type(op1) ~= type(op2) then return nil end
- local mm1 = metatable(op1)[event]
- local mm2 = metatable(op2)[event]
- if mm1 == mm2 then return mm1 else return nil end
- end
-</PRE>
-The "eq" event is defined as follows:
-<PRE>
- function eq_event (op1, op2)
- if type(op1) ~= type(op2) then -- different types?
- return false -- different objects
- end
- if op1 == op2 then -- primitive equal?
- return true -- objects are equal
- end
- -- try metamethod
- local h = getcomphandler(op1, op2, "__eq")
- if h then
- return h(op1, op2)
- else
- return false
- end
- end
-</PRE>
-<code>a ~= b</code> is equivalent to <code>not (a == b)</code>.
-
-<p><li><b>"lt":</b>
-the <code><</code> operation.
-<PRE>
- function lt_event (op1, op2)
- if type(op1) == "number" and type(op2) == "number" then
- return op1 < op2 -- numeric comparison
- elseif type(op1) == "string" and type(op2) == "string" then
- return op1 < op2 -- lexicographic comparison
- else
- local h = getcomphandler(op1, op2, "__lt")
- if h then
- return h(op1, op2)
- else
- error("...");
- end
- end
- end
-</PRE>
-<code>a > b</code> is equivalent to <code>b < a</code>.
-
-<p><li><b>"le":</b>
-the <code><=</code> operation.
-<PRE>
- function le_event (op1, op2)
- if type(op1) == "number" and type(op2) == "number" then
- return op1 <= op2 -- numeric comparison
- elseif type(op1) == "string" and type(op2) == "string" then
- return op1 <= op2 -- lexicographic comparison
- else
- local h = getcomphandler(op1, op2, "__le")
- if h then
- return h(op1, op2)
- else
- h = getcomphandler(op1, op2, "__lt")
- if h then
- return not h(op2, op1)
- else
- error("...");
- end
- end
- end
- end
-</PRE>
-<code>a >= b</code> is equivalent to <code>b <= a</code>.
-Note that, in the absence of a "le" metamethod,
-Lua tries the "lt", assuming that <code>a <= b</code> is
-equivalent to <code>not (b < a)</code>.
-
-<p><li><b>"index":</b>
-The indexing access <code>table[key]</code>.
-<PRE>
- function gettable_event (table, key)
- local h
- if type(table) == "table" then
- local v = rawget(table, key)
- if v ~= nil then return v end
- h = metatable(table).__index
- if h == nil then return nil end
- else
- h = metatable(table).__index
- if h == nil then
- error("...");
- end
- end
- if type(h) == "function" then
- return h(table, key) -- call the handler
- else return h[key] -- or repeat operation on it
- end
-</PRE>
-
-<p><li><b>"newindex":</b>
-The indexing assignment <code>table[key] = value</code>.
-<PRE>
- function settable_event (table, key, value)
- local h
- if type(table) == "table" then
- local v = rawget(table, key)
- if v ~= nil then rawset(table, key, value); return end
- h = metatable(table).__newindex
- if h == nil then rawset(table, key, value); return end
- else
- h = metatable(table).__newindex
- if h == nil then
- error("...");
- end
- end
- if type(h) == "function" then
- return h(table, key,value) -- call the handler
- else h[key] = value -- or repeat operation on it
- end
-</PRE>
-
-<p><li><b>"call":</b>
-called when Lua calls a value.
-<PRE>
- function function_event (func, ...)
- if type(func) == "function" then
- return func(unpack(arg)) -- primitive call
- else
- local h = metatable(func).__call
- if h then
- return h(func, unpack(arg))
- else
- error("...")
- end
- end
- end
-</PRE>
-
-<p></ul>
-
-<p><a name="GC"><a name="2.9"><h2>2.9 - Garbage Collection</h2></a></a>
-
-<p>Lua does automatic memory management.
-That means that
-you do not have to worry about allocating memory for new objects
-and freeing it when the objects are no longer needed.
-Lua manages memory automatically by running
-a <em>garbage collector</em> from time to time
-to collect all <em>dead objects</em>
-(that is, those objects that are no longer accessible from Lua).
-All objects in Lua are subject to automatic management:
-tables, userdata, functions, threads, and strings.
-
-<p>Lua uses two numbers to control its garbage-collection cycles.
-One number counts how many bytes of dynamic memory Lua is using;
-the other is a threshold.
-When the number of bytes crosses the threshold,
-Lua runs the garbage collector,
-which reclaims the memory of all dead objects.
-The byte counter is adjusted,
-and then the threshold is reset to twice the new value of the byte counter.
-
-<p>Through the C API, you can query those numbers
-and change the threshold (see <a href="#GC-API">3.7</a>).
-Setting the threshold to zero actually forces an immediate
-garbage-collection cycle,
-while setting it to a huge number effectively stops the garbage collector.
-Using Lua code you have a more limited control over garbage-collection cycles,
-through the <code>gcinfo</code> and <code>collectgarbage</code> functions
-(see <a href="#predefined">5.1</a>).
-
-<p><a name="2.9.1"><h3>2.9.1 - Garbage-Collection Metamethods</h3></a>
-
-<p>Using the C API,
-you can set garbage-collector metamethods for userdata (see <a href="#metatable">2.8</a>).
-These metamethods are also called <em>finalizers</em>.
-Finalizers allow you to coordinate Lua's garbage collection
-with external resource management
-(such as closing files, network or database connections,
-or freeing your own memory).
-
-<p>Free userdata with a field <code>__gc</code> in their metatables are not
-collected immediately by the garbage collector.
-Instead, Lua puts them in a list.
-After the collection,
-Lua does the equivalent of the following function
-for each userdata in that list:
-<PRE>
- function gc_event (udata)
- local h = metatable(udata).__gc
- if h then
- h(udata)
- end
- end
-</PRE>
-
-<p>At the end of each garbage-collection cycle,
-the finalizers for userdata are called in <em>reverse</em>
-order of their creation,
-among those collected in that cycle.
-That is, the first finalizer to be called is the one associated
-with the userdata created last in the program.
-
-<p><a name="weak-table"><a name="2.9.2"><h3>2.9.2 - Weak Tables</h3></a></a>
-
-<p>A <em>weak table</em> is a table whose elements are
-<em>weak references</em>.
-A weak reference is ignored by the garbage collector.
-In other words,
-if the only references to an object are weak references,
-then the garbage collector will collect that object.
-
-<p>A weak table can have weak keys, weak values, or both.
-A table with weak keys allows the collection of its keys,
-but prevents the collection of its values.
-A table with both weak keys and weak values allows the collection of
-both keys and values.
-In any case, if either the key or the value is collected,
-the whole pair is removed from the table.
-The weakness of a table is controlled by the value of the
-<code>__mode</code> field of its metatable.
-If the <code>__mode</code> field is a string containing the character `<code>k</code>´,
-the keys in the table are weak.
-If <code>__mode</code> contains `<code>v</code>´,
-the values in the table are weak.
-
-<p>After you use a table as a metatable,
-you should not change the value of its field <code>__mode</code>.
-Otherwise, the weak behavior of the tables controlled by this
-metatable is undefined.
-
-<p><a name="coroutine"><a name="2.10"><h2>2.10 - Coroutines</h2></a></a>
-
-<p>Lua supports coroutines,
-also called <em>semi-coroutines</em>
-or <em>collaborative multithreading</em>.
-A coroutine in Lua represents an independent thread of execution.
-Unlike threads in multithread systems, however,
-a coroutine only suspends its execution by explicitly calling
-a yield function.
-
-<p>You create a coroutine with a call to <code>coroutine.create</code>.
-Its sole argument is a function
-that is the main function of the coroutine.
-The <code>create</code> function only creates a new coroutine and
-returns a handle to it (an object of type <em>thread</em>);
-it does not start the coroutine execution.
-
-<p>When you first call <code>coroutine.resume</code>,
-passing as its first argument the thread returned by <code>coroutine.create</code>,
-the coroutine starts its execution,
-at the first line of its main function.
-Extra arguments passed to <code>coroutine.resume</code> are given as
-parameters for the coroutine main function.
-After the coroutine starts running,
-it runs until it terminates or <em>yields</em>.
-
-<p>A coroutine can terminate its execution in two ways:
-Normally, when its main function returns
-(explicitly or implicitly, after the last instruction);
-and abnormally, if there is an unprotected error.
-In the first case, <code>coroutine.resume</code> returns <B>true</B>,
-plus any values returned by the coroutine main function.
-In case of errors, <code>coroutine.resume</code> returns <B>false</B>
-plus an error message.
-
-<p>A coroutine yields by calling <code>coroutine.yield</code>.
-When a coroutine yields,
-the corresponding <code>coroutine.resume</code> returns immediately,
-even if the yield happens inside nested function calls
-(that is, not in the main function,
-but in a function directly or indirectly called by the main function).
-In the case of a yield, <code>coroutine.resume</code> also returns <B>true</B>,
-plus any values passed to <code>coroutine.yield</code>.
-The next time you resume the same coroutine,
-it continues its execution from the point where it yielded,
-with the call to <code>coroutine.yield</code> returning any extra
-arguments passed to <code>coroutine.resume</code>.
-
-<p>The <code>coroutine.wrap</code> function creates a coroutine
-like <code>coroutine.create</code>,
-but instead of returning the coroutine itself,
-it returns a function that, when called, resumes the coroutine.
-Any arguments passed to that function
-go as extra arguments to resume.
-The function returns all the values returned by resume,
-except the first one (the boolean error code).
-Unlike <code>coroutine.resume</code>,
-this function does not catch errors;
-any error is propagated to the caller.
-
-<p>As an example,
-consider the next code:
-<PRE>
-function foo1 (a)
- print("foo", a)
- return coroutine.yield(2*a)
-end
-
-co = coroutine.create(function (a,b)
- print("co-body", a, b)
- local r = foo1(a+1)
- print("co-body", r)
- local r, s = coroutine.yield(a+b, a-b)
- print("co-body", r, s)
- return b, "end"
-end)
-
-a, b = coroutine.resume(co, 1, 10)
-print("main", a, b)
-a, b, c = coroutine.resume(co, "r")
-print("main", a, b, c)
-a, b, c = coroutine.resume(co, "x", "y")
-print("main", a, b, c)
-a, b = coroutine.resume(co, "x", "y")
-print("main", a, b)
-</PRE>
-When you run it, it produces the following output:
-<PRE>
-co-body 1 10
-foo 2
-main true 4
-co-body r
-main true 11 -9
-co-body x y
-main true 10 end
-main false cannot resume dead coroutine
-</PRE>
-
-<p>
-<a name="API"><a name="3"><h1>3 - The Application Program Interface</h1></a></a>
-
-
-<p>This section describes the C API for Lua, that is,
-the set of C functions available to the host program to communicate
-with Lua.
-All API functions and related types and constants
-are declared in the header file <code>lua.h</code>.
-
-<p>Even when we use the term "function",
-any facility in the API may be provided as a <em>macro</em> instead.
-All such macros use each of its arguments exactly once
-(except for the first argument, which is always a Lua state),
-and so do not generate hidden side-effects.
-
-<p><a name="mangstate"><a name="3.1"><h2>3.1 - States</h2></a></a>
-
-<p>The Lua library is fully reentrant:
-it has no global variables.
-
-The whole state of the Lua interpreter
-(global variables, stack, etc.)
-is stored in a dynamically allocated structure of type <code>lua_State</code>.
-
-A pointer to this state must be passed as the first argument to
-every function in the library, except to <code>lua_open</code>,
-which creates a Lua state from scratch.
-
-<p>Before calling any API function,
-you must create a state by calling <code>lua_open</code>:
-<PRE>
- lua_State *lua_open (void);
-</PRE>
-
-
-<p>To release a state created with <code>lua_open</code>, call <code>lua_close</code>:
-<PRE>
- void lua_close (lua_State *L);
-</PRE>
-
-This function destroys all objects in the given Lua state
-(calling the corresponding garbage-collection metamethods, if any)
-and frees all dynamic memory used by that state.
-On several platforms, you may not need to call this function,
-because all resources are naturally released when the host program ends.
-On the other hand,
-long-running programs,
-such as a daemon or a web server,
-might need to release states as soon as they are not needed,
-to avoid growing too large.
-
-<p><a name="3.2"><h2>3.2 - The Stack and Indices</h2></a>
-
-<p>Lua uses a <em>virtual stack</em> to pass values to and from C.
-Each element in this stack represents a Lua value
-(<B>nil</B>, number, string, etc.).
-
-<p>Whenever Lua calls C, the called function gets a new stack,
-which is independent of previous stacks and of stacks of
-C functions that are still active.
-That stack initially contains any arguments to the C function,
-and it is where the C function pushes its results to be returned to the caller (see <a href="#LuacallC">3.16</a>)
-to be returned to the caller.
-
-<p>For convenience,
-most query operations in the API do not follow a strict stack discipline.
-Instead, they can refer to any element in the stack by using an <em>index</em>:
-A positive index represents an <em>absolute</em> stack position
-(starting at 1);
-a negative index represents an <em>offset</em> from the top of the stack.
-More specifically, if the stack has <em>n</em> elements,
-then index 1 represents the first element
-(that is, the element that was pushed onto the stack first)
-and
-index <em>n</em> represents the last element;
-index <em>-1</em> also represents the last element
-(that is, the element at the top)
-and index <em>-n</em> represents the first element.
-We say that an index is <em>valid</em>
-if it lies between 1 and the stack top
-(that is, if <code>1 <= abs(index) <= top</code>).
-
-
-<p>At any time, you can get the index of the top element by calling
-<code>lua_gettop</code>:
-<PRE>
- int lua_gettop (lua_State *L);
-</PRE>
-Because indices start at 1,
-the result of <code>lua_gettop</code> is equal to the number of elements in the stack
-(and so 0 means an empty stack).
-
-<p>When you interact with Lua API,
-<em>you are responsible for controlling stack overflow</em>.
-The function
-<PRE>
- int lua_checkstack (lua_State *L, int extra);
-</PRE>
-
-grows the stack size to <code>top + extra</code> elements;
-it returns false if it cannot grow the stack to that size.
-This function never shrinks the stack;
-if the stack is already larger than the new size,
-it is left unchanged.
-
-<p>Whenever Lua calls C,
-it ensures that at least <code>LUA_MINSTACK</code> stack positions are available.
-<code>LUA_MINSTACK</code> is defined in <code>lua.h</code> as 20,
-so that usually you do not have to worry about stack space
-unless your code has loops pushing elements onto the stack.
-
-<p>Most query functions accept as indices any value inside the
-available stack space, that is, indices up to the maximum stack size
-you have set through <code>lua_checkstack</code>.
-Such indices are called <em>acceptable indices</em>.
-More formally, we define an <em>acceptable index</em>
-as follows:
-<PRE>
- (index < 0 && abs(index) <= top) || (index > 0 && index <= stackspace)
-</PRE>
-Note that 0 is never an acceptable index.
-
-<p>Unless otherwise noted,
-any function that accepts valid indices can also be called with
-<em>pseudo-indices</em>,
-which represent some Lua values that are accessible to the C code
-but are not in the stack.
-Pseudo-indices are used to access the global environment,
-the registry, and the upvalues of a C function (see <a href="#c-closure">3.17</a>).
-
-<p><a name="3.3"><h2>3.3 - Stack Manipulation</h2></a>
-The API offers the following functions for basic stack manipulation:
-<PRE>
- void lua_settop (lua_State *L, int index);
- void lua_pushvalue (lua_State *L, int index);
- void lua_remove (lua_State *L, int index);
- void lua_insert (lua_State *L, int index);
- void lua_replace (lua_State *L, int index);
-</PRE>
-
-
-
-<p><code>lua_settop</code> accepts any acceptable index,
-or 0,
-and sets the stack top to that index.
-If the new top is larger than the old one,
-then the new elements are filled with <B>nil</B>.
-If <code>index</code> is 0, then all stack elements are removed.
-A useful macro defined in the <code>lua.h</code> is
-<PRE>
- #define lua_pop(L,n) lua_settop(L, -(n)-1)
-</PRE>
-
-which pops <code>n</code> elements from the stack.
-
-<p><code>lua_pushvalue</code> pushes onto the stack a copy of the element
-at the given index.
-<code>lua_remove</code> removes the element at the given position,
-shifting down the elements above that position to fill the gap.
-<code>lua_insert</code> moves the top element into the given position,
-shifting up the elements above that position to open space.
-<code>lua_replace</code> moves the top element into the given position,
-without shifting any element (therefore replacing the value at
-the given position).
-All these functions accept only valid indices.
-(You cannot call <code>lua_remove</code> or <code>lua_insert</code> with
-pseudo-indices, as they do not represent a stack position.)
-
-<p>As an example, if the stack starts as <code>10 20 30 40 50*</code>
-(from bottom to top; the `<code>*</code>´ marks the top),
-then
-<PRE>
- lua_pushvalue(L, 3) --> 10 20 30 40 50 30*
- lua_pushvalue(L, -1) --> 10 20 30 40 50 30 30*
- lua_remove(L, -3) --> 10 20 30 40 30 30*
- lua_remove(L, 6) --> 10 20 30 40 30*
- lua_insert(L, 1) --> 30 10 20 30 40*
- lua_insert(L, -1) --> 30 10 20 30 40* (no effect)
- lua_replace(L, 2) --> 30 40 20 30*
- lua_settop(L, -3) --> 30 40*
- lua_settop(L, 6) --> 30 40 nil nil nil nil*
-</PRE>
-
-<p><a name="3.4"><h2>3.4 - Querying the Stack</h2></a>
-
-<p>To check the type of a stack element,
-the following functions are available:
-<PRE>
- int lua_type (lua_State *L, int index);
- int lua_isnil (lua_State *L, int index);
- int lua_isboolean (lua_State *L, int index);
- int lua_isnumber (lua_State *L, int index);
- int lua_isstring (lua_State *L, int index);
- int lua_istable (lua_State *L, int index);
- int lua_isfunction (lua_State *L, int index);
- int lua_iscfunction (lua_State *L, int index);
- int lua_isuserdata (lua_State *L, int index);
- int lua_islightuserdata (lua_State *L, int index);
-</PRE>
-
-
-
-
-
-These functions can be called with any acceptable index.
-
-<p><code>lua_type</code> returns the type of a value in the stack,
-or <code>LUA_TNONE</code> for a non-valid index
-(that is, if that stack position is "empty").
-The types returned by <code>lua_type</code> are coded by the following constants
-defined in <code>lua.h</code>:
-<code>LUA_TNIL</code>,
-<code>LUA_TNUMBER</code>,
-<code>LUA_TBOOLEAN</code>,
-<code>LUA_TSTRING</code>,
-<code>LUA_TTABLE</code>,
-<code>LUA_TFUNCTION</code>,
-<code>LUA_TUSERDATA</code>,
-<code>LUA_TTHREAD</code>,
-<code>LUA_TLIGHTUSERDATA</code>.
-The following function translates these constants to strings:
-<PRE>
- const char *lua_typename (lua_State *L, int type);
-</PRE>
-
-
-<p>The <code>lua_is*</code> functions return 1 if the object is compatible
-with the given type, and 0 otherwise.
-<code>lua_isboolean</code> is an exception to this rule:
-It succeeds only for boolean values
-(otherwise it would be useless,
-as any value has a boolean value).
-They always return 0 for a non-valid index.
-<code>lua_isnumber</code> accepts numbers and numerical strings;
-<code>lua_isstring</code> accepts strings and numbers (see <a href="#coercion">2.2.1</a>);
-<code>lua_isfunction</code> accepts both Lua functions and C functions;
-and <code>lua_isuserdata</code> accepts both full and light userdata.
-To distinguish between Lua functions and C functions,
-you can use <code>lua_iscfunction</code>.
-To distinguish between full and light userdata,
-you can use <code>lua_islightuserdata</code>.
-To distinguish between numbers and numerical strings,
-you can use <code>lua_type</code>.
-
-<p>The API also contains functions to compare two values in the stack:
-<PRE>
- int lua_equal (lua_State *L, int index1, int index2);
- int lua_rawequal (lua_State *L, int index1, int index2);
- int lua_lessthan (lua_State *L, int index1, int index2);
-</PRE>
-
-<code>lua_equal</code> and <code>lua_lessthan</code>
-are equivalent to their counterparts in Lua (see <a href="#rel-ops">2.5.2</a>).
-<code>lua_rawequal</code> compares the values for primitive equality,
-without metamethods.
-These functions return 0 (false) if any of the indices are non-valid.
-
-<p><a name="lua-to"><a name="3.5"><h2>3.5 - Getting Values from the Stack</h2></a></a>
-
-<p>To translate a value in the stack to a specific C type,
-you can use the following conversion functions:
-<PRE>
- int lua_toboolean (lua_State *L, int index);
- lua_Number lua_tonumber (lua_State *L, int index);
- const char *lua_tostring (lua_State *L, int index);
- size_t lua_strlen (lua_State *L, int index);
- lua_CFunction lua_tocfunction (lua_State *L, int index);
- void *lua_touserdata (lua_State *L, int index);
- lua_State *lua_tothread (lua_State *L, int index);
- void *lua_topointer (lua_State *L, int index);
-</PRE>
-
-
-
-These functions can be called with any acceptable index.
-When called with a non-valid index,
-they act as if the given value had an incorrect type.
-
-<p><code>lua_toboolean</code> converts the Lua value at the given index
-to a C "boolean" value (0 or 1).
-Like all tests in Lua, <code>lua_toboolean</code> returns 1 for any Lua value
-different from <B>false</B> and <B>nil</B>;
-otherwise it returns 0.
-It also returns 0 when called with a non-valid index.
-(If you want to accept only real boolean values,
-use <code>lua_isboolean</code> to test the type of the value.)
-
-<p><code>lua_tonumber</code> converts the Lua value at the given index
-to a number (by default, <code>lua_Number</code> is <code>double</code>).
-
-The Lua value must be a number or a string convertible to number
-(see <a href="#coercion">2.2.1</a>); otherwise, <code>lua_tonumber</code> returns 0.
-
-<p><code>lua_tostring</code> converts the Lua value at the given index to a string
-(<code>const char*</code>).
-The Lua value must be a string or a number;
-otherwise, the function returns <code>NULL</code>.
-If the value is a number,
-then <code>lua_tostring</code> also
-<em>changes the actual value in the stack to a string</em>.
-(This change confuses <code>lua_next</code>
-when <code>lua_tostring</code> is applied to keys.)
-<code>lua_tostring</code> returns a fully aligned pointer
-to a string inside the Lua state.
-This string always has a zero (<code>'\0'</code>)
-after its last character (as in C),
-but may contain other zeros in its body.
-If you do not know whether a string may contain zeros,
-you can use <code>lua_strlen</code> to get its actual length.
-Because Lua has garbage collection,
-there is no guarantee that the pointer returned by <code>lua_tostring</code>
-will be valid after the corresponding value is removed from the stack.
-If you need the string after the current function returns,
-then you should duplicate it or put it into the registry (see <a href="#registry">3.18</a>).
-
-<p><code>lua_tocfunction</code> converts a value in the stack to a C function.
-This value must be a C function;
-otherwise, <code>lua_tocfunction</code> returns <code>NULL</code>.
-The type <code>lua_CFunction</code> is explained in <a href="#LuacallC">3.16</a>.
-
-<p><code>lua_tothread</code> converts a value in the stack to a Lua thread
-(represented as <code>lua_State *</code>).
-This value must be a thread;
-otherwise, <code>lua_tothread</code> returns <code>NULL</code>.
-
-<p><code>lua_topointer</code> converts a value in the stack to a generic
-C pointer (<code>void *</code>).
-The value may be a userdata, a table, a thread, or a function;
-otherwise, <code>lua_topointer</code> returns <code>NULL</code>.
-Lua ensures that different objects of the
-same type return different pointers.
-There is no direct way to convert the pointer back to its original value.
-Typically this function is used for debug information.
-
-<p><code>lua_touserdata</code> is explained in <a href="#userdata">3.8</a>.
-
-<p><a name="pushing"><a name="3.6"><h2>3.6 - Pushing Values onto the Stack</h2></a></a>
-
-<p>The API has the following functions to
-push C values onto the stack:
-<PRE>
- void lua_pushboolean (lua_State *L, int b);
- void lua_pushnumber (lua_State *L, lua_Number n);
- void lua_pushlstring (lua_State *L, const char *s, size_t len);
- void lua_pushstring (lua_State *L, const char *s);
- void lua_pushnil (lua_State *L);
- void lua_pushcfunction (lua_State *L, lua_CFunction f);
- void lua_pushlightuserdata (lua_State *L, void *p);
-</PRE>
-
-<p>
-
-
-These functions receive a C value,
-convert it to a corresponding Lua value,
-and push the result onto the stack.
-In particular, <code>lua_pushlstring</code> and <code>lua_pushstring</code>
-make an internal copy of the given string.
-<code>lua_pushstring</code> can only be used to push proper C strings
-(that is, strings that end with a zero and do not contain embedded zeros);
-otherwise, you should use the more general <code>lua_pushlstring</code>,
-which accepts an explicit size.
-
-<p>You can also push "formatted" strings:
-<PRE>
- const char *lua_pushfstring (lua_State *L, const char *fmt, ...);
- const char *lua_pushvfstring (lua_State *L, const char *fmt, va_list argp);
-</PRE>
-
-These functions push onto the stack a formatted string
-and return a pointer to that string.
-They are similar to <code>sprintf</code> and <code>vsprintf</code>,
-but with some important differences:
-<ul>
-<li> You do not have to allocate the space for the result:
-The result is a Lua string and Lua takes care of memory allocation
-(and deallocation, through garbage collection).
-<li> The conversion specifiers are quite restricted.
-There are no flags, widths, or precisions.
-The conversion specifiers can be simply
-`<code>%%</code>´ (inserts a `<code>%</code>´ in the string),
-`<code>%s</code>´ (inserts a zero-terminated string, with no size restrictions),
-`<code>%f</code>´ (inserts a <code>lua_Number</code>),
-`<code>%d</code>´ (inserts an <code>int</code>), and
-`<code>%c</code>´ (inserts an <code>int</code> as a character).
-</ul>
-
-<p>The function
-<PRE>
- void lua_concat (lua_State *L, int n);
-</PRE>
-
-concatenates the <code>n</code> values at the top of the stack,
-pops them, and leaves the result at the top.
-If <code>n</code> is 1, the result is that single string
-(that is, the function does nothing);
-if <code>n</code> is 0, the result is the empty string.
-Concatenation is done following the usual semantics of Lua
-(see <a href="#concat">2.5.4</a>).
-
-<p><a name="GC-API"><a name="3.7"><h2>3.7 - Controlling Garbage Collection</h2></a></a>
-
-<p>Lua uses two numbers to control its garbage collection:
-the <em>count</em> and the <em>threshold</em> (see <a href="#GC">2.9</a>).
-The first counts the amount of memory in use by Lua;
-when the count reaches the threshold,
-Lua runs its garbage collector.
-After the collection, the count is updated
-and the threshold is set to twice the count value.
-
-<p>You can access the current values of these two numbers through the
-following functions:
-<PRE>
- int lua_getgccount (lua_State *L);
- int lua_getgcthreshold (lua_State *L);
-</PRE>
-
-Both return their respective values in Kbytes.
-You can change the threshold value with
-<PRE>
- void lua_setgcthreshold (lua_State *L, int newthreshold);
-</PRE>
-
-Again, the <code>newthreshold</code> value is given in Kbytes.
-When you call this function,
-Lua sets the new threshold and checks it against the byte counter.
-If the new threshold is less than the byte counter,
-then Lua immediately runs the garbage collector.
-In particular
-<code>lua_setgcthreshold(L,0)</code> forces a garbage collection.
-After the collection,
-a new threshold is set according to the previous rule.
-
-<p><a name="userdata"><a name="3.8"><h2>3.8 - Userdata</h2></a></a>
-
-<p>Userdata represents C values in Lua.
-Lua supports two types of userdata:
-<em>full userdata</em> and <em>light userdata</em>.
-
-<p>A full userdata represents a block of memory.
-It is an object (like a table):
-You must create it, it can have its own metatable,
-and you can detect when it is being collected.
-A full userdata is only equal to itself (under raw equality).
-
-<p>A light userdata represents a pointer.
-It is a value (like a number):
-You do not create it, it has no metatables,
-it is not collected (as it was never created).
-A light userdata is equal to "any"
-light userdata with the same C address.
-
-<p>In Lua code, there is no way to test whether a userdata is full or light;
-both have type <code>userdata</code>.
-In C code, <code>lua_type</code> returns <code>LUA_TUSERDATA</code> for full userdata,
-and <code>LUA_TLIGHTUSERDATA</code> for light userdata.
-
-<p>You can create a new full userdata with the following function:
-<PRE>
- void *lua_newuserdata (lua_State *L, size_t size);
-</PRE>
-
-This function allocates a new block of memory with the given size,
-pushes on the stack a new userdata with the block address,
-and returns this address.
-
-<p>To push a light userdata into the stack you use
-<code>lua_pushlightuserdata</code> (see <a href="#pushing">3.6</a>).
-
-<p><code>lua_touserdata</code> (see <a href="#lua-to">3.5</a>) retrieves the value of a userdata.
-When applied on a full userdata, it returns the address of its block;
-when applied on a light userdata, it returns its pointer;
-when applied on a non-userdata value, it returns <code>NULL</code>.
-
-<p>When Lua collects a full userdata,
-it calls the userdata's <code>gc</code> metamethod, if any,
-and then it frees the userdata's corresponding memory.
-
-<p><a name="3.9"><h2>3.9 - Metatables</h2></a>
-
-<p>The following functions allow you to manipulate the metatables
-of an object:
-<PRE>
- int lua_getmetatable (lua_State *L, int index);
- int lua_setmetatable (lua_State *L, int index);
-</PRE>
-
-<code>lua_getmetatable</code> pushes on the stack the metatable of a given object.
-If the index is not valid,
-or if the object does not have a metatable,
-<code>lua_getmetatable</code> returns 0 and pushes nothing on the stack.
-
-<p><code>lua_setmetatable</code> pops a table from the stack and
-sets it as the new metatable for the given object.
-<code>lua_setmetatable</code> returns 0 when it cannot
-set the metatable of the given object
-(that is, when the object is neither a userdata nor a table);
-even then it pops the table from the stack.
-
-<p><a name="3.10"><h2>3.10 - Loading Lua Chunks</h2></a>
-
-<p>You can load a Lua chunk with <code>lua_load</code>:
-<PRE>
- typedef const char * (*lua_Chunkreader)
- (lua_State *L, void *data, size_t *size);
-
- int lua_load (lua_State *L, lua_Chunkreader reader, void *data,
- const char *chunkname);
-</PRE>
-
-The return values of <code>lua_load</code> are:
-<ul>
-<li> 0 --- no errors;
-<li> <code>LUA_ERRSYNTAX</code> ---
-syntax error during pre-compilation.
-<li> <code>LUA_ERRMEM</code> ---
-memory allocation error.
-</ul>
-If there are no errors,
-<code>lua_load</code> pushes the compiled chunk as a Lua
-function on top of the stack.
-Otherwise, it pushes an error message.
-
-<p><code>lua_load</code> automatically detects whether the chunk is text or binary,
-and loads it accordingly (see program <code>luac</code>).
-
-<p><code>lua_load</code> uses a user-supplied <em>reader</em> function to read the chunk.
-Everytime it needs another piece of the chunk,
-<code>lua_load</code> calls the reader,
-passing along its <code>data</code> parameter.
-The reader must return a pointer to a block of memory
-with a new piece of the chunk
-and set <code>size</code> to the block size.
-To signal the end of the chunk, the reader returns <code>NULL</code>.
-The reader function may return pieces of any size greater than zero.
-
-<p>In the current implementation,
-the reader function cannot call any Lua function;
-to ensure that, it always receives <code>NULL</code> as the Lua state.
-
-<p>The <em>chunkname</em> is used for error messages
-and debug information (see <a href="#debugI">4</a>).
-
-<p>See the auxiliary library (<code>lauxlib.c</code>)
-for examples of how to use <code>lua_load</code>
-and for some ready-to-use functions to load chunks
-from files and strings.
-
-<p><a name="3.11"><h2>3.11 - Manipulating Tables</h2></a>
-
-<p>Tables are created by calling
-the function
-<PRE>
- void lua_newtable (lua_State *L);
-</PRE>
-
-This function creates a new, empty table and pushes it onto the stack.
-
-<p>To read a value from a table that resides somewhere in the stack,
-call
-<PRE>
- void lua_gettable (lua_State *L, int index);
-</PRE>
-
-where <code>index</code> points to the table.
-<code>lua_gettable</code> pops a key from the stack
-and returns (on the stack) the contents of the table at that key.
-The table is left where it was in the stack.
-As in Lua, this function may trigger a metamethod
-for the "index" event (see <a href="#metatable">2.8</a>).
-To get the real value of any table key,
-without invoking any metamethod,
-use the <em>raw</em> version:
-<PRE>
- void lua_rawget (lua_State *L, int index);
-</PRE>
-
-
-<p>To store a value into a table that resides somewhere in the stack,
-you push the key and then the value onto the stack,
-and call
-<PRE>
- void lua_settable (lua_State *L, int index);
-</PRE>
-
-where <code>index</code> points to the table.
-<code>lua_settable</code> pops from the stack both the key and the value.
-The table is left where it was in the stack.
-As in Lua, this operation may trigger a metamethod
-for the "settable" or "newindex" events.
-To set the real value of any table index,
-without invoking any metamethod,
-use the <em>raw</em> version:
-<PRE>
- void lua_rawset (lua_State *L, int index);
-</PRE>
-
-
-<p>You can traverse a table with the function
-<PRE>
- int lua_next (lua_State *L, int index);
-</PRE>
-
-where <code>index</code> points to the table to be traversed.
-The function pops a key from the stack,
-and pushes a key-value pair from the table
-(the "next" pair after the given key).
-If there are no more elements, then <code>lua_next</code> returns 0
-(and pushes nothing).
-Use a <B>nil</B> key to signal the start of a traversal.
-
-<p>A typical traversal looks like this:
-<PRE>
- /* table is in the stack at index `t' */
- lua_pushnil(L); /* first key */
- while (lua_next(L, t) != 0) {
- /* `key' is at index -2 and `value' at index -1 */
- printf("%s - %s\n",
- lua_typename(L, lua_type(L, -2)), lua_typename(L, lua_type(L, -1)));
- lua_pop(L, 1); /* removes `value'; keeps `key' for next iteration */
- }
-</PRE>
-
-<p>While traversing a table,
-do not call <code>lua_tostring</code> directly on a key,
-unless you know that the key is actually a string.
-Recall that <code>lua_tostring</code> <em>changes</em> the value at the given index;
-this confuses the next call to <code>lua_next</code>.
-
-<p><a name="globals"><a name="3.12"><h2>3.12 - Manipulating Environments</h2></a></a>
-
-<p>All global variables are kept in ordinary Lua tables,
-called environments.
-The initial environment is called the global environment.
-This table is always at pseudo-index <code>LUA_GLOBALSINDEX</code>.
-
-<p>To access and change the value of global variables,
-you can use regular table operations over an environment table.
-For instance, to access the value of a global variable, do
-<PRE>
- lua_pushstring(L, varname);
- lua_gettable(L, LUA_GLOBALSINDEX);
-</PRE>
-
-<p>You can change the global environment of a Lua thread using <code>lua_replace</code>.
-
-<p>The following functions get and set the environment of Lua functions:
-<PRE>
- void lua_getfenv (lua_State *L, int index);
- int lua_setfenv (lua_State *L, int index);
-</PRE>
-
-<code>lua_getfenv</code> pushes on the stack the environment table of
-the function at index <code>index</code> in the stack.
-If the function is a C function,
-<code>lua_getfenv</code> pushes the global environment.
-<code>lua_setfenv</code> pops a table from the stack and sets it as
-the new environment for the function at index <code>index</code> in the stack.
-If the object at the given index is not a Lua function,
-<code>lua_setfenv</code> returns 0.
-
-<p><a name="3.13"><h2>3.13 - Using Tables as Arrays</h2></a>
-The API has functions that help to use Lua tables as arrays,
-that is,
-tables indexed by numbers only:
-<PRE>
- void lua_rawgeti (lua_State *L, int index, int n);
- void lua_rawseti (lua_State *L, int index, int n);
-</PRE>
-
-
-
-<p><code>lua_rawgeti</code> pushes the value of the <em>n</em>-th element of the table
-at stack position <code>index</code>.
-<code>lua_rawseti</code> sets the value of the <em>n</em>-th element of the table
-at stack position <code>index</code> to the value at the top of the stack,
-removing this value from the stack.
-
-<p><a name="3.14"><h2>3.14 - Calling Functions</h2></a>
-
-<p>Functions defined in Lua
-and C functions registered in Lua
-can be called from the host program.
-This is done using the following protocol:
-First, the function to be called is pushed onto the stack;
-then, the arguments to the function are pushed
-in <em>direct order</em>, that is, the first argument is pushed first.
-Finally, the function is called using
-<PRE>
- void lua_call (lua_State *L, int nargs, int nresults);
-</PRE>
-
-<code>nargs</code> is the number of arguments that you pushed onto the stack.
-All arguments and the function value are popped from the stack,
-and the function results are pushed.
-The number of results are adjusted to <code>nresults</code>,
-unless <code>nresults</code> is <code>LUA_MULTRET</code>.
-In that case, <em>all</em> results from the function are pushed.
-Lua takes care that the returned values fit into the stack space.
-The function results are pushed onto the stack in direct order
-(the first result is pushed first),
-so that after the call the last result is on the top.
-
-<p>The following example shows how the host program may do the
-equivalent to this Lua code:
-<PRE>
- a = f("how", t.x, 14)
-</PRE>
-Here it is in C:
-<PRE>
- lua_pushstring(L, "t");
- lua_gettable(L, LUA_GLOBALSINDEX); /* global `t' (for later use) */
- lua_pushstring(L, "a"); /* var name */
- lua_pushstring(L, "f"); /* function name */
- lua_gettable(L, LUA_GLOBALSINDEX); /* function to be called */
- lua_pushstring(L, "how"); /* 1st argument */
- lua_pushstring(L, "x"); /* push the string "x" */
- lua_gettable(L, -5); /* push result of t.x (2nd arg) */
- lua_pushnumber(L, 14); /* 3rd argument */
- lua_call(L, 3, 1); /* call function with 3 arguments and 1 result */
- lua_settable(L, LUA_GLOBALSINDEX); /* set global variable `a' */
- lua_pop(L, 1); /* remove `t' from the stack */
-</PRE>
-Note that the code above is "balanced":
-at its end, the stack is back to its original configuration.
-This is considered good programming practice.
-
-<p>(We did this example using only the raw functions provided by Lua's API,
-to show all the details.
-Usually programmers define and use several macros and auxiliary functions
-that provide higher level access to Lua.
-See the source code of the standard libraries for examples.)
-
-<p><a name="lua_pcall"><a name="3.15"><h2>3.15 - Protected Calls</h2></a></a>
-
-<p>When you call a function with <code>lua_call</code>,
-any error inside the called function is propagated upwards
-(with a <code>longjmp</code>).
-If you need to handle errors,
-then you should use <code>lua_pcall</code>:
-<PRE>
- int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc);
-</PRE>
-Both <code>nargs</code> and <code>nresults</code> have the same meaning as
-in <code>lua_call</code>.
-If there are no errors during the call,
-<code>lua_pcall</code> behaves exactly like <code>lua_call</code>.
-However, if there is any error,
-<code>lua_pcall</code> catches it,
-pushes a single value at the stack (the error message),
-and returns an error code.
-Like <code>lua_call</code>,
-<code>lua_pcall</code> always removes the function
-and its arguments from the stack.
-
-<p>If <code>errfunc</code> is 0,
-then the error message returned is exactly the original error message.
-Otherwise, <code>errfunc</code> gives the stack index for an
-<em>error handler function</em>.
-(In the current implementation, that index cannot be a pseudo-index.)
-In case of runtime errors,
-that function will be called with the error message
-and its return value will be the message returned by <code>lua_pcall</code>.
-
-<p>Typically, the error handler function is used to add more debug
-information to the error message, such as a stack traceback.
-Such information cannot be gathered after the return of <code>lua_pcall</code>,
-since by then the stack has unwound.
-
-<p>The <code>lua_pcall</code> function returns 0 in case of success
-or one of the following error codes
-(defined in <code>lua.h</code>):
-<ul>
-<li> <code>LUA_ERRRUN</code> --- a runtime error.
-<li> <code>LUA_ERRMEM</code> --- memory allocation error.
-For such errors, Lua does not call the error handler function.
-<li> <code>LUA_ERRERR</code> ---
-error while running the error handler function.
-</ul>
-
-<p><a name="LuacallC"><a name="3.16"><h2>3.16 - Defining C Functions</h2></a></a>
-
-<p>Lua can be extended with functions written in C.
-These functions must be of type <code>lua_CFunction</code>,
-which is defined as
-<PRE>
- typedef int (*lua_CFunction) (lua_State *L);
-</PRE>
-
-A C function receives a Lua state and returns an integer,
-the number of values it wants to return to Lua.
-
-<p>In order to communicate properly with Lua,
-a C function must follow the following protocol,
-which defines the way parameters and results are passed:
-A C function receives its arguments from Lua in its stack
-in direct order (the first argument is pushed first).
-So, when the function starts,
-its first argument (if any) is at index 1.
-To return values to Lua, a C function just pushes them onto the stack,
-in direct order (the first result is pushed first),
-and returns the number of results.
-Any other value in the stack below the results will be properly
-discharged by Lua.
-Like a Lua function, a C function called by Lua can also return
-many results.
-
-<p>As an example, the following function receives a variable number
-of numerical arguments and returns their average and sum:
-<PRE>
- static int foo (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- lua_Number sum = 0;
- int i;
- for (i = 1; i <= n; i++) {
- if (!lua_isnumber(L, i)) {
- lua_pushstring(L, "incorrect argument to function `average'");
- lua_error(L);
- }
- sum += lua_tonumber(L, i);
- }
- lua_pushnumber(L, sum/n); /* first result */
- lua_pushnumber(L, sum); /* second result */
- return 2; /* number of results */
- }
-</PRE>
-
-<p>To register a C function to Lua,
-there is the following convenience macro:
-<PRE>
- #define lua_register(L,n,f) \
- (lua_pushstring(L, n), \
- lua_pushcfunction(L, f), \
- lua_settable(L, LUA_GLOBALSINDEX))
- /* lua_State *L; */
- /* const char *n; */
- /* lua_CFunction f; */
-</PRE>
-
-which receives the name the function will have in Lua
-and a pointer to the function.
-Thus,
-the C function <code>foo</code> above may be registered in Lua as
-<code>average</code> by calling
-<PRE>
- lua_register(L, "average", foo);
-</PRE>
-
-<p><a name="c-closure"><a name="3.17"><h2>3.17 - Defining C Closures</h2></a></a>
-
-<p>When a C function is created,
-it is possible to associate some values with it,
-thus creating a <em>C closure</em>;
-these values are then accessible to the function whenever it is called.
-To associate values with a C function,
-first these values should be pushed onto the stack
-(when there are multiple values, the first value is pushed first).
-Then the function
-<PRE>
- void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n);
-</PRE>
-
-is used to push the C function onto the stack,
-with the argument <code>n</code> telling how many values should be
-associated with the function
-(<code>lua_pushcclosure</code> also pops these values from the stack);
-in fact, the macro <code>lua_pushcfunction</code> is defined as
-<code>lua_pushcclosure</code> with <code>n</code> set to 0.
-
-<p>Then, whenever the C function is called,
-those values are located at specific pseudo-indices.
-Those pseudo-indices are produced by a macro <code>lua_upvalueindex</code>.
-The first value associated with a function is at position
-<code>lua_upvalueindex(1)</code>, and so on.
-Any access to <code>lua_upvalueindex(<em>n</em>)</code>,
-where <em>n</em> is greater than the number of upvalues of the
-current function,
-produces an acceptable (but invalid) index.
-
-<p>For examples of C functions and closures,
-see the standard libraries in the official Lua distribution
-(<code>src/lib/*.c</code>).
-
-<p><a name="registry"><a name="3.18"><h2>3.18 - Registry</h2></a></a>
-
-<p>Lua provides a registry,
-a pre-defined table that can be used by any C code to
-store whatever Lua value it needs to store,
-specially if the C code needs to keep that Lua value
-outside the life span of a C function.
-This table is always located at pseudo-index
-<code>LUA_REGISTRYINDEX</code>.
-Any C library can store data into this table,
-as long as it chooses keys different from other libraries.
-Typically, you should use as key a string containing your library name
-or a light userdata with the address of a C object in your code.
-
-<p>The integer keys in the registry are used by the reference mechanism,
-implemented by the auxiliary library,
-and therefore should not be used by other purposes.
-
-<p><a name="3.19"><h2>3.19 - Error Handling in C</h2></a>
-
-<p>Internally, Lua uses the C <code>longjmp</code> facility to handle errors.
-When Lua faces any error
-(such as memory allocation errors, type errors, syntax errors)
-it <em>raises</em> an error, that is, it does a long jump.
-A <em>protected environment</em> uses <code>setjmp</code>
-to set a recover point;
-any error jumps to the most recent active recover point.
-
-<p>If an error happens outside any protected environment,
-Lua calls a <em>panic function</em>
-and then calls <code>exit(EXIT_FAILURE)</code>.
-You can change the panic function with
-<PRE>
- lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf);
-</PRE>
-Your new panic function may avoid the application exit by
-never returning (e.g., by doing a long jump).
-Nevertheless, the corresponding Lua state will not be consistent;
-the only safe operation with it is to close it.
-
-<p>Almost any function in the API may raise an error,
-for instance due to a memory allocation error.
-The following functions run in protected mode
-(that is, they create a protected environment to run),
-so they never raise an error:
-<code>lua_open</code>, <code>lua_close</code>, <code>lua_load</code>,
-and <code>lua_pcall</code>.
-
-<p>There is yet another function that runs a given C function in protected mode:
-<PRE>
- int lua_cpcall (lua_State *L, lua_CFunction func, void *ud);
-</PRE>
-
-<code>lua_cpcall</code> calls <code>func</code> in protected mode.
-<code>func</code> starts with only one element in its stack,
-a light userdata containing <code>ud</code>.
-In case of errors,
-<code>lua_cpcall</code> returns the same error codes as <code>lua_pcall</code>
-(see <a href="#lua_pcall">3.15</a>),
-plus the error object on the top of the stack;
-otherwise, it returns zero, and does not change the stack.
-Any value returned by <code>func</code> is discarded.
-
-<p>C code can generate a Lua error calling the function
-<PRE>
- void lua_error (lua_State *L);
-</PRE>
-
-The error message (which actually can be any type of object)
-must be on the stack top.
-This function does a long jump,
-and therefore never returns.
-
-<p><a name="3.20"><h2>3.20 - Threads</h2></a>
-
-<p>Lua offers partial support for multiple threads of execution.
-If you have a C library that offers multi-threading,
-then Lua can cooperate with it to implement the equivalent facility in Lua.
-Also, Lua implements its own coroutine system on top of threads.
-The following function creates a new thread in Lua:
-<PRE>
- lua_State *lua_newthread (lua_State *L);
-</PRE>
-
-This function pushes the thread on the stack and returns a pointer to
-a <code>lua_State</code> that represents this new thread.
-The new state returned by this function shares with the original state
-all global objects (such as tables),
-but has an independent run-time stack.
-
-<p>Each thread has an independent global environment table.
-When you create a thread, this table is the same as that of the given state,
-but you can change each one independently.
-
-<p>There is no explicit function to close or to destroy a thread.
-Threads are subject to garbage collection,
-like any Lua object.
-
-<p>To manipulate threads as coroutines,
-Lua offers the following functions:
-<PRE>
- int lua_resume (lua_State *L, int narg);
- int lua_yield (lua_State *L, int nresults);
-</PRE>
-
-To start a coroutine, you first create a new thread;
-then you push on its stack the body function plus any eventual arguments;
-then you call <code>lua_resume</code>,
-with <code>narg</code> being the number of arguments.
-This call returns when the coroutine suspends or finishes its execution.
-When it returns, the stack contains all values passed to <code>lua_yield</code>,
-or all values returned by the body function.
-<code>lua_resume</code> returns 0 if there are no errors running the coroutine,
-or an error code (see <a href="#lua_pcall">3.15</a>).
-In case of errors,
-the stack contains only the error message.
-To restart a coroutine, you put on its stack only the values to
-be passed as results from <code>yield</code>,
-and then call <code>lua_resume</code>.
-
-<p>The <code>lua_yield</code> function can only be called as the
-return expression of a C function, as follows:
-<PRE>
- return lua_yield (L, nresults);
-</PRE>
-When a C function calls <code>lua_yield</code> in that way,
-the running coroutine suspends its execution,
-and the call to <code>lua_resume</code> that started this coroutine returns.
-The parameter <code>nresults</code> is the number of values from the stack
-that are passed as results to <code>lua_resume</code>.
-
-<p>To exchange values between different threads,
-you may use <code>lua_xmove</code>:
-<PRE>
- void lua_xmove (lua_State *from, lua_State *to, int n);
-</PRE>
-It pops <code>n</code> values from the stack <code>from</code>,
-and puhses them into the stack <code>to</code>.
-
-<p>
-<a name="debugI"><a name="4"><h1>4 - The Debug Interface</h1></a></a>
-
-<p>Lua has no built-in debugging facilities.
-Instead, it offers a special interface
-by means of functions and <em>hooks</em>.
-This interface allows the construction of different
-kinds of debuggers, profilers, and other tools
-that need "inside information" from the interpreter.
-
-<p><a name="4.1"><h2>4.1 - Stack and Function Information</h2></a>
-
-<p>The main function to get information about the interpreter runtime stack is
-<PRE>
- int lua_getstack (lua_State *L, int level, lua_Debug *ar);
-</PRE>
-
-This function fills parts of a <code>lua_Debug</code> structure with
-an identification of the <em>activation record</em>
-of the function executing at a given level.
-Level 0 is the current running function,
-whereas level <em>n+1</em> is the function that has called level <em>n</em>.
-When there are no errors, <code>lua_getstack</code> returns 1;
-when called with a level greater than the stack depth,
-it returns 0.
-
-<p>The structure <code>lua_Debug</code> is used to carry different pieces of
-information about an active function:
-<PRE>
- typedef struct lua_Debug {
- int event;
- const char *name; /* (n) */
- const char *namewhat; /* (n) `global', `local', `field', `method' */
- const char *what; /* (S) `Lua' function, `C' function, Lua `main' */
- const char *source; /* (S) */
- int currentline; /* (l) */
- int nups; /* (u) number of upvalues */
- int linedefined; /* (S) */
- char short_src[LUA_IDSIZE]; /* (S) */
-
- /* private part */
- ...
- } lua_Debug;
-</PRE>
-
-<code>lua_getstack</code> fills only the private part
-of this structure, for later use.
-To fill the other fields of <code>lua_Debug</code> with useful information,
-call
-<PRE>
- int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);
-</PRE>
-
-This function returns 0 on error
-(for instance, an invalid option in <code>what</code>).
-Each character in the string <code>what</code>
-selects some fields of the structure <code>ar</code> to be filled,
-as indicated by the letter in parentheses in the definition of <code>lua_Debug</code>
-above:
-`<code>S</code>´ fills in the fields <code>source</code>, <code>linedefined</code>,
-and <code>what</code>;
-`<code>l</code>´ fills in the field <code>currentline</code>, etc.
-Moreover, `<code>f</code>´ pushes onto the stack the function that is
-running at the given level.
-
-<p>To get information about a function that is not active
-(that is, not in the stack),
-you push it onto the stack
-and start the <code>what</code> string with the character `<code>></code>´.
-For instance, to know in which line a function <code>f</code> was defined,
-you can write
-<PRE>
- lua_Debug ar;
- lua_pushstring(L, "f");
- lua_gettable(L, LUA_GLOBALSINDEX); /* get global `f' */
- lua_getinfo(L, ">S", &ar);
- printf("%d\n", ar.linedefined);
-</PRE>
-The fields of <code>lua_Debug</code> have the following meaning:
-<ul>
-
-<p><li><b><code>source</code></b>
-If the function was defined in a string,
-then <code>source</code> is that string.
-If the function was defined in a file,
-then <code>source</code> starts with a `<code>@</code>´ followed by the file name.
-
-<p><li><b><code>short_src</code></b>
-A "printable" version of <code>source</code>, to be used in error messages.
-
-<p><li><b><code>linedefined</code></b>
-the line number where the definition of the function starts.
-
-<p><li><b><code>what</code></b> the string <code>"Lua"</code> if this is a Lua function,
-<code>"C"</code> if this is a C function,
-<code>"main"</code> if this is the main part of a chunk,
-and <code>"tail"</code> if this was a function that did a tail call.
-In the latter case,
-Lua has no other information about this function.
-
-<p><li><b><code>currentline</code></b>
-the current line where the given function is executing.
-When no line information is available,
-<code>currentline</code> is set to <em>-1</em>.
-
-<p><li><b><code>name</code></b>
-a reasonable name for the given function.
-Because functions in Lua are first class values,
-they do not have a fixed name:
-Some functions may be the value of multiple global variables,
-while others may be stored only in a table field.
-The <code>lua_getinfo</code> function checks how the function was
-called or whether it is the value of a global variable to
-find a suitable name.
-If it cannot find a name,
-then <code>name</code> is set to <code>NULL</code>.
-
-<p><li><b><code>namewhat</code></b>
-Explains the <code>name</code> field.
-The value of <code>namewhat</code> can be
-<code>"global"</code>, <code>"local"</code>, <code>"method"</code>,
-<code>"field"</code>, or <code>""</code> (the empty string),
-according to how the function was called.
-(Lua uses the empty string when no other option seems to apply.)
-
-<p><li><b><code>nups</code></b>
-The number of upvalues of the function.
-
-<p></ul>
-
-<p><a name="4.2"><h2>4.2 - Manipulating Local Variables and Upvalues</h2></a>
-
-<p>For the manipulation of local variables and upvalues,
-the debug interface uses indices:
-The first parameter or local variable has index 1, and so on,
-until the last active local variable.
-Upvalues have no particular order,
-as they are active through the whole function.
-
-<p>The following functions allow the manipulation of the
-local variables of a given activation record:
-<PRE>
- const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n);
- const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n);
-</PRE>
-
-The parameter <code>ar</code> must be a valid activation record that was
-filled by a previous call to <code>lua_getstack</code> or
-given as argument to a hook (see <a href="#sub-hooks">4.3</a>).
-<code>lua_getlocal</code> gets the index <code>n</code> of a local variable,
-pushes the variable's value onto the stack,
-and returns its name.
-<code>lua_setlocal</code> assigns the value at the top of the stack
-to the variable and returns its name.
-Both functions return <code>NULL</code>
-when the index is greater than
-the number of active local variables.
-
-<p>The following functions allow the manipulation of the
-upvalues of a given function
-(unlike local variables,
-the upvalues of a function are accessible even when the
-function is not active):
-<PRE>
- const char *lua_getupvalue (lua_State *L, int funcindex, int n);
- const char *lua_setupvalue (lua_State *L, int funcindex, int n);
-</PRE>
-
-These functions operate both on Lua functions and on C functions.
-(For Lua functions,
-upvalues are the external local variables that the function uses,
-and that consequently are included in its closure.)
-<code>funcindex</code> points to a function in the stack.
-<code>lua_getpuvalue</code> gets the index <code>n</code> of an upvalue,
-pushes the upvalue's value onto the stack,
-and returns its name.
-<code>lua_setupvalue</code> assigns the value at the top of the stack
-to the upvalue and returns its name.
-Both functions return <code>NULL</code>
-when the index is greater than the number of upvalues.
-For C functions, these functions use the empty string <code>""</code>
-as a name for all upvalues.
-
-<p>As an example, the following function lists the names of all
-local variables and upvalues for a function at a given level of the stack:
-<PRE>
- int listvars (lua_State *L, int level) {
- lua_Debug ar;
- int i;
- const char *name;
- if (lua_getstack(L, level, &ar) == 0)
- return 0; /* failure: no such level in the stack */
- i = 1;
- while ((name = lua_getlocal(L, &ar, i++)) != NULL) {
- printf("local %d %s\n", i-1, name);
- lua_pop(L, 1); /* remove variable value */
- }
- lua_getinfo(L, "f", &ar); /* retrieves function */
- i = 1;
- while ((name = lua_getpuvalue(L, -1, i++)) != NULL) {
- printf("upvalue %d %s\n", i-1, name);
- lua_pop(L, 1); /* remove upvalue value */
- }
- return 1;
- }
-</PRE>
-
-<p><a name="sub-hooks"><a name="4.3"><h2>4.3 - Hooks</h2></a></a>
-
-<p>Lua offers a mechanism of hooks, which are
-user-defined C functions that are called during the program execution.
-A hook may be called in four different events:
-a <em>call</em> event, when Lua calls a function;
-a <em>return</em> event, when Lua returns from a function;
-a <em>line</em> event, when Lua starts executing a new line of code;
-and a <em>count</em> event, which happens every "count" instructions.
-Lua identifies these events with the following constants:
-<code>LUA_HOOKCALL</code>,
-<code>LUA_HOOKRET</code> (or <code>LUA_HOOKTAILRET</code>, see below),
-<code>LUA_HOOKLINE</code>,
-and <code>LUA_HOOKCOUNT</code>.
-
-<p>A hook has type <code>lua_Hook</code>, defined as follows:
-<PRE>
- typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);
-</PRE>
-
-You can set the hook with the following function:
-<PRE>
- int lua_sethook (lua_State *L, lua_Hook func, int mask, int count);
-</PRE>
-
-<code>func</code> is the hook.
-<code>mask</code> specifies on which events the hook will be called:
-It is formed by a disjunction of the constants
-<code>LUA_MASKCALL</code>,
-<code>LUA_MASKRET</code>,
-<code>LUA_MASKLINE</code>,
-and <code>LUA_MASKCOUNT</code>.
-The <code>count</code> argument is only meaningful when the mask
-includes <code>LUA_MASKCOUNT</code>.
-For each event, the hook is called as explained below:
-<ul>
-<li><b>The call hook</b> is called when the interpreter calls a function.
-The hook is called just after Lua enters the new function.
-<li><b>The return hook</b> is called when the interpreter returns from a function.
-The hook is called just before Lua leaves the function.
-<li><b>The line hook</b> is called when the interpreter is about to
-start the execution of a new line of code,
-or when it jumps back in the code (even to the same line).
-(This event only happens while Lua is executing a Lua function.)
-<li><b>The count hook</b> is called after the interpreter executes every
-<code>count</code> instructions.
-(This event only happens while Lua is executing a Lua function.)
-</ul>
-
-<p>A hook is disabled by setting <code>mask</code> to zero.
-
-<p>You can get the current hook, the current mask,
-and the current count with the next functions:
-<PRE>
- lua_Hook lua_gethook (lua_State *L);
- int lua_gethookmask (lua_State *L);
- int lua_gethookcount (lua_State *L);
-</PRE>
-
-
-<p>Whenever a hook is called, its <code>ar</code> argument has its field
-<code>event</code> set to the specific event that triggered the hook.
-Moreover, for line events, the field <code>currentline</code> is also set.
-To get the value of any other field in <code>ar</code>,
-the hook must call <code>lua_getinfo</code>.
-For return events, <code>event</code> may be <code>LUA_HOOKRET</code>,
-the normal value, or <code>LUA_HOOKTAILRET</code>.
-In the latter case, Lua is simulating a return from
-a function that did a tail call;
-in this case, it is useless to call <code>lua_getinfo</code>.
-
-<p>While Lua is running a hook, it disables other calls to hooks.
-Therefore, if a hook calls back Lua to execute a function or a chunk,
-that execution occurs without any calls to hooks.
-
-<p>
-<a name="libraries"><a name="5"><h1>5 - Standard Libraries</h1></a></a>
-
-<p>The standard libraries provide useful functions
-that are implemented directly through the C API.
-Some of these functions provide essential services to the language
-(e.g., <code>type</code> and <code>getmetatable</code>);
-others provide access to "outside" services (e.g., I/O);
-and others could be implemented in Lua itself,
-but are quite useful or have critical performance to
-deserve an implementation in C (e.g., <code>sort</code>).
-
-<p>All libraries are implemented through the official C API
-and are provided as separate C modules.
-Currently, Lua has the following standard libraries:
-<ul>
-<li> basic library;
-<li> string manipulation;
-<li> table manipulation;
-<li> mathematical functions (sin, log, etc.);
-<li> input and output;
-<li> operating system facilities;
-<li> debug facilities.
-</ul>
-Except for the basic library,
-each library provides all its functions as fields of a global table
-or as methods of its objects.
-
-<p>To have access to these libraries,
-the C host program must first call the functions
-<code>luaopen_base</code> (for the basic library),
-<code>luaopen_string</code> (for the string library),
-<code>luaopen_table</code> (for the table library),
-<code>luaopen_math</code> (for the mathematical library),
-<code>luaopen_io</code> (for the I/O and the Operating System libraries),
-and <code>luaopen_debug</code> (for the debug library).
-These functions are declared in <code>lualib.h</code>.
-
-
-
-
-
-
-
-<p><a name="predefined"><a name="5.1"><h2>5.1 - Basic Functions</h2></a></a>
-
-<p>The basic library provides some core functions to Lua.
-If you do not include this library in your application,
-you should check carefully whether you need to provide some alternative
-implementation for some of its facilities.
-
-<p><h3><code>assert (v [, message])</code></h3>
-Issues an error when
-the value of its argument <code>v</code> is <B>nil</B> or <B>false</B>;
-otherwise, returns this value.
-<code>message</code> is an error message;
-when absent, it defaults to "assertion failed!"
-
-<p><h3><code>collectgarbage ([limit])</code></h3>
-
-<p>Sets the garbage-collection threshold to the given limit
-(in Kbytes) and checks it against the byte counter.
-If the new threshold is smaller than the byte counter,
-then Lua immediately runs the garbage collector (see <a href="#GC">2.9</a>).
-If <code>limit</code> is absent, it defaults to zero
-(thus forcing a garbage-collection cycle).
-
-<p><h3><code>dofile (filename)</code></h3>
-Opens the named file and executes its contents as a Lua chunk.
-When called without arguments,
-<code>dofile</code> executes the contents of the standard input (<code>stdin</code>).
-Returns any value returned by the chunk.
-In case of errors, <code>dofile</code> propagates the error
-to its caller (that is, it does not run in protected mode).
-
-<p><a name="pdf-error"><h3><code>error (message [, level])</code></h3></a>
-
-Terminates the last protected function called
-and returns <code>message</code> as the error message.
-Function <code>error</code> never returns.
-
-<p>The <code>level</code> argument specifies where the error
-message points the error.
-With level 1 (the default), the error position is where the
-<code>error</code> function was called.
-Level 2 points the error to where the function
-that called <code>error</code> was called; and so on.
-
-<p><h3><code>_G</code></h3>
-A global variable (not a function) that
-holds the global environment (that is, <code>_G._G = _G</code>).
-Lua itself does not use this variable;
-changing its value does not affect any environment.
-(Use <code>setfenv</code> to change environments.)
-
-<p><h3><code>getfenv (f)</code></h3>
-Returns the current environment in use by the function.
-<code>f</code> can be a Lua function or a number,
-which specifies the function at that stack level:
-Level 1 is the function calling <code>getfenv</code>.
-If the given function is not a Lua function,
-or if <code>f</code> is 0,
-<code>getfenv</code> returns the global environment.
-The default for <code>f</code> is 1.
-
-<p>If the environment has a <code>"__fenv"</code> field,
-returns the associated value, instead of the environment.
-
-<p><a name="pdf-getmetatable"><h3><code>getmetatable (object)</code></h3></a>
-
-
-<p>If the object does not have a metatable, returns <B>nil</B>.
-Otherwise,
-if the object's metatable has a <code>"__metatable"</code> field,
-returns the associated value.
-Otherwise, returns the metatable of the given object.
-
-<p><h3><code>gcinfo ()</code></h3>
-
-<p>Returns two results:
-the number of Kbytes of dynamic memory that Lua is using
-and the current garbage collector threshold (also in Kbytes).
-
-<p><h3><code>ipairs (t)</code></h3>
-
-<p>Returns an iterator function, the table <code>t</code>, and 0,
-so that the construction
-<PRE>
- for i,v in ipairs(t) do ... end
-</PRE>
-will iterate over the pairs (<code>1,t[1]</code>), (<code>2,t[2]</code>), ...,
-up to the first integer key with a nil value in the table.
-
-<p><h3><code>loadfile (filename)</code></h3>
-
-<p>Loads a file as a Lua chunk (without running it).
-If there are no errors,
-returns the compiled chunk as a function;
-otherwise, returns <B>nil</B> plus the error message.
-The environment of the returned function is the global environment.
-
-<p><h3><code>loadlib (libname, funcname)</code></h3>
-
-<p>Links the program with the dynamic C library <code>libname</code>.
-Inside this library, looks for a function <code>funcname</code>
-and returns this function as a C function.
-
-<p><code>libname</code> must be the complete file name of the C library,
-including any eventual path and extension.
-
-<p>This function is not supported by ANSI C.
-As such, it is only available on some platforms
-(Windows, Linux, Solaris, BSD, plus other Unix systems that
-support the <code>dlfcn</code> standard).
-
-<p><h3><code>loadstring (string [, chunkname])</code></h3>
-Loads a string as a Lua chunk (without running it).
-If there are no errors,
-returns the compiled chunk as a function;
-otherwise, returns <B>nil</B> plus the error message.
-The environment of the returned function is the global environment.
-
-<p>The optional parameter <code>chunkname</code>
-is the name to be used in error messages and debug information.
-
-<p>To load and run a given string, use the idiom
-<PRE>
- assert(loadstring(s))()
-</PRE>
-
-<p><h3><code>next (table [, index])</code></h3>
-Allows a program to traverse all fields of a table.
-Its first argument is a table and its second argument
-is an index in this table.
-<code>next</code> returns the next index of the table and the
-value associated with the index.
-When called with <B>nil</B> as its second argument,
-<code>next</code> returns the first index
-of the table and its associated value.
-When called with the last index,
-or with <B>nil</B> in an empty table,
-<code>next</code> returns <B>nil</B>.
-If the second argument is absent, then it is interpreted as <B>nil</B>.
-
-<p>Lua has no declaration of fields;
-There is no difference between a
-field not present in a table or a field with value <B>nil</B>.
-Therefore, <code>next</code> only considers fields with non-<B>nil</B> values.
-The order in which the indices are enumerated is not specified,
-<em>even for numeric indices</em>.
-(To traverse a table in numeric order,
-use a numerical <b>for</b> or the <code>ipairs</code> function.)
-
-<p>The behavior of <code>next</code> is <em>undefined</em> if,
-during the traversal,
-you assign any value to a non-existent field in the table.
-
-<p><h3><code>pairs (t)</code></h3>
-
-<p>Returns the <code>next</code> function and the table <code>t</code> (plus a <B>nil</B>),
-so that the construction
-<PRE>
- for k,v in pairs(t) do ... end
-</PRE>
-will iterate over all key-value pairs of table <code>t</code>.
-
-<p><a name="pdf-pcall"><h3><code>pcall (f, arg1, arg2, ...)</code></h3></a>
-
-<p>Calls function <code>f</code> with
-the given arguments in protected mode.
-That means that any error inside <code>f</code> is not propagated;
-instead, <code>pcall</code> catches the error
-and returns a status code.
-Its first result is the status code (a boolean),
-which is <B>true</B> if the call succeeds without errors.
-In such case, <code>pcall</code> also returns all results from the call,
-after this first result.
-In case of any error, <code>pcall</code> returns <B>false</B> plus the error message.
-
-<p><h3><code>print (e1, e2, ...)</code></h3>
-Receives any number of arguments,
-and prints their values in <code>stdout</code>,
-using the <code>tostring</code> function to convert them to strings.
-This function is not intended for formatted output,
-but only as a quick way to show a value,
-typically for debugging.
-For formatted output, use <code>format</code> (see <a href="#format">5.3</a>).
-
-<p><h3><code>rawequal (v1, v2)</code></h3>
-Checks whether <code>v1</code> is equal to <code>v2</code>,
-without invoking any metamethod.
-Returns a boolean.
-
-<p><h3><code>rawget (table, index)</code></h3>
-Gets the real value of <code>table[index]</code>,
-without invoking any metamethod.
-<code>table</code> must be a table;
-<code>index</code> is any value different from <B>nil</B>.
-
-<p><h3><code>rawset (table, index, value)</code></h3>
-Sets the real value of <code>table[index]</code> to <code>value</code>,
-without invoking any metamethod.
-<code>table</code> must be a table,
-<code>index</code> is any value different from <B>nil</B>,
-and <code>value</code> is any Lua value.
-
-<p><h3><code>require (packagename)</code></h3>
-
-<p>Loads the given package.
-The function starts by looking into the table <code>_LOADED</code>
-to determine whether <code>packagename</code> is already loaded.
-If it is, then <code>require</code> returns the value that the package
-returned when it was first loaded.
-Otherwise, it searches a path looking for a file to load.
-
-<p>If the global variable <code>LUA_PATH</code> is a string,
-this string is the path.
-Otherwise, <code>require</code> tries the environment variable <code>LUA_PATH</code>.
-As a last resort, it uses the predefined path <code>"?;?.lua"</code>.
-
-<p>The path is a sequence of <em>templates</em> separated by semicolons.
-For each template, <code>require</code> will change each interrogation
-mark in the template to <code>packagename</code>,
-and then will try to load the resulting file name.
-So, for instance, if the path is
-<PRE>
- "./?.lua;./?.lc;/usr/local/?/?.lua;/lasttry"
-</PRE>
-a <code>require "mod"</code> will try to load the files
-<code>./mod.lua</code>,
-<code>./mod.lc</code>,
-<code>/usr/local/mod/mod.lua</code>,
-and <code>/lasttry</code>, in that order.
-
-<p>The function stops the search as soon as it can load a file,
-and then it runs the file.
-After that, it associates, in table <code>_LOADED</code>,
-the package name with the value that the package returned,
-and returns that value.
-If the package returns <B>nil</B> (or no value),
-<code>require</code> converts this value to <B>true</B>.
-If the package returns <B>false</B>,
-<code>require</code> also returns <B>false</B>.
-However, as the mark in table <code>_LOADED</code> is <B>false</B>,
-any new attempt to reload the file
-will happen as if the package was not loaded
-(that is, the package will be loaded again).
-
-<p>If there is any error loading or running the file,
-or if it cannot find any file in the path,
-then <code>require</code> signals an error.
-
-<p>While running a file,
-<code>require</code> defines the global variable <code>_REQUIREDNAME</code>
-with the package name.
-The package being loaded always runs within the global environment.
-
-<p><a name="setfenv"><h3><code>setfenv (f, table)</code></h3></a>
-
-<p>Sets the current environment to be used by the given function.
-<code>f</code> can be a Lua function or a number,
-which specifies the function at that stack level:
-Level 1 is the function calling <code>setfenv</code>.
-
-<p>As a special case, when <code>f</code> is 0 <code>setfenv</code> changes
-the global environment of the running thread.
-
-<p>If the original environment has a <code>"__fenv"</code> field,
-<code>setfenv</code> raises an error.
-
-<p><h3><code>setmetatable (table, metatable)</code></h3>
-
-<p>Sets the metatable for the given table.
-(You cannot change the metatable of a userdata from Lua.)
-If <code>metatable</code> is <B>nil</B>, removes the metatable of the given table.
-If the original metatable has a <code>"__metatable"</code> field,
-raises an error.
-
-<p><h3><code>tonumber (e [, base])</code></h3>
-Tries to convert its argument to a number.
-If the argument is already a number or a string convertible
-to a number, then <code>tonumber</code> returns that number;
-otherwise, it returns <B>nil</B>.
-
-<p>An optional argument specifies the base to interpret the numeral.
-The base may be any integer between 2 and 36, inclusive.
-In bases above 10, the letter `<code>A</code>´ (in either upper or lower case)
-represents 10, `<code>B</code>´ represents 11, and so forth,
-with `<code>Z</code>´ representing 35.
-In base 10 (the default), the number may have a decimal part,
-as well as an optional exponent part (see <a href="#coercion">2.2.1</a>).
-In other bases, only unsigned integers are accepted.
-
-<p><h3><code>tostring (e)</code></h3>
-Receives an argument of any type and
-converts it to a string in a reasonable format.
-For complete control of how numbers are converted,
-use <code>format</code> (see <a href="#format">5.3</a>).
-
-<p>If the metatable of <code>e</code> has a <code>"__tostring"</code> field,
-<code>tostring</code> calls the corresponding value
-with <code>e</code> as argument,
-and uses the result of the call as its result.
-
-<p><a name="pdf-type"><h3><code>type (v)</code></h3></a>
-Returns the type of its only argument, coded as a string.
-The possible results of this function are
-<code>"nil"</code> (a string, not the value <B>nil</B>),
-<code>"number"</code>,
-<code>"string"</code>,
-<code>"boolean</code>,
-<code>"table"</code>,
-<code>"function"</code>,
-<code>"thread"</code>,
-and <code>"userdata"</code>.
-
-<p><h3><code>unpack (list)</code></h3>
-Returns all elements from the given list.
-This function is equivalent to
-<PRE>
- return list[1], list[2], ..., list[n]
-</PRE>
-except that the above code can be written only for a fixed <em>n</em>.
-The number <em>n</em> is the size of the list,
-as defined for the <code>table.getn</code> function.
-
-<p><h3><code>_VERSION</code></h3>
-A global variable (not a function) that
-holds a string containing the current interpreter version.
-The current content of this string is <code>"Lua 5.0"</code>.
-
-<p><h3><code>xpcall (f, err)</code></h3>
-
-<p>This function is similar to <code>pcall</code>,
-except that you can set a new error handler.
-
-<p><code>xpcall</code> calls function <code>f</code> in protected mode,
-using <code>err</code> as the error handler.
-Any error inside <code>f</code> is not propagated;
-instead, <code>xpcall</code> catches the error,
-calls the <code>err</code> function with the original error object,
-and returns a status code.
-Its first result is the status code (a boolean),
-which is true if the call succeeds without errors.
-In such case, <code>xpcall</code> also returns all results from the call,
-after this first result.
-In case of any error,
-<code>xpcall</code> returns false plus the result from <code>err</code>.
-
-<p><a name="5.2"><h2>5.2 - Coroutine Manipulation</h2></a>
-
-<p>The operations related to coroutines comprise a sub-library of
-the basic library and come inside the table <code>coroutine</code>.
-See <a href="#coroutine">2.10</a> for a general description of coroutines.
-
-<p><h3><code>coroutine.create (f)</code></h3>
-
-<p>Creates a new coroutine, with body <code>f</code>.
-<code>f</code> must be a Lua function.
-Returns this new coroutine,
-an object with type <code>"thread"</code>.
-
-<p><h3><code>coroutine.resume (co, val1, ...)</code></h3>
-
-<p>Starts or continues the execution of coroutine <code>co</code>.
-The first time you resume a coroutine,
-it starts running its body.
-The arguments <code>val1</code>, ... go as the arguments to the body function.
-If the coroutine has yielded,
-<code>resume</code> restarts it;
-the arguments <code>val1</code>, ... go as the results from the yield.
-
-<p>If the coroutine runs without any errors,
-<code>resume</code> returns <B>true</B> plus any values passed to <code>yield</code>
-(if the coroutine yields) or any values returned by the body function
-(if the coroutine terminates).
-If there is any error,
-<code>resume</code> returns <B>false</B> plus the error message.
-
-<p><h3><code>coroutine.status (co)</code></h3>
-
-<p>Returns the status of coroutine <code>co</code>, as a string:
-<code>"running"</code>,
-if the coroutine is running (that is, it called <code>status</code>);
-<code>"suspended"</code>, if the coroutine is suspended in a call to <code>yield</code>,
-or if it has not started running yet;
-and <code>"dead"</code> if the coroutine has finished its body function,
-or if it has stopped with an error.
-
-<p><h3><code>coroutine.wrap (f)</code></h3>
-
-<p>Creates a new coroutine, with body <code>f</code>.
-<code>f</code> must be a Lua function.
-Returns a function that resumes the coroutine each time it is called.
-Any arguments passed to the function behave as the
-extra arguments to <code>resume</code>.
-Returns the same values returned by <code>resume</code>,
-except the first boolean.
-In case of error, propagates the error.
-
-<p><h3><code>coroutine.yield (val1, ...)</code></h3>
-
-<p>Suspends the execution of the calling coroutine.
-The coroutine cannot be running neither a C function,
-nor a metamethod, nor an iterator.
-Any arguments to <code>yield</code> go as extra results to <code>resume</code>.
-
-<p><a name="5.3"><h2>5.3 - String Manipulation</h2></a>
-This library provides generic functions for string manipulation,
-such as finding and extracting substrings, and pattern matching.
-When indexing a string in Lua, the first character is at position 1
-(not at 0, as in C).
-Indices are allowed to be negative and are interpreted as indexing backwards,
-from the end of the string.
-Thus, the last character is at position <em>-1</em>, and so on.
-
-<p>The string library provides all its functions inside the table
-<code>string</code>.
-
-<p><h3><code>string.byte (s [, i])</code></h3>
-Returns the internal numerical code of the <code>i</code>-th character of <code>s</code>,
-or <B>nil</B> if the index is out of range.
-If <code>i</code> is absent, then it is assumed to be 1.
-<code>i</code> may be negative.
-
-<p>Note that numerical codes are not necessarily portable across platforms.
-
-<p><h3><code>string.char (i1, i2, ...)</code></h3>
-Receives 0 or more integers.
-Returns a string with length equal to the number of arguments,
-in which each character has the internal numerical code equal
-to its correspondent argument.
-
-<p>Note that numerical codes are not necessarily portable across platforms.
-
-<p><h3><code>string.dump (function)</code></h3>
-
-<p>Returns a binary representation of the given function,
-so that a later <code>loadstring</code> on that string returns
-a copy of the function.
-<code>function</code> must be a Lua function without upvalues.
-
-<p><h3><code>string.find (s, pattern [, init [, plain]])</code></h3>
-Looks for the first <em>match</em> of
-<code>pattern</code> in the string <code>s</code>.
-If it finds one, then <code>find</code> returns the indices of <code>s</code>
-where this occurrence starts and ends;
-otherwise, it returns <B>nil</B>.
-If the pattern specifies captures (see <code>string.gsub</code> below),
-the captured strings are returned as extra results.
-A third, optional numerical argument <code>init</code> specifies
-where to start the search;
-its default value is 1 and may be negative.
-A value of <B>true</B> as a fourth, optional argument <code>plain</code>
-turns off the pattern matching facilities,
-so the function does a plain "find substring" operation,
-with no characters in <code>pattern</code> being considered "magic".
-Note that if <code>plain</code> is given, then <code>init</code> must be given too.
-
-<p><h3><code>string.len (s)</code></h3>
-Receives a string and returns its length.
-The empty string <code>""</code> has length 0.
-Embedded zeros are counted,
-so <code>"a\000b\000c"</code> has length 5.
-
-<p><h3><code>string.lower (s)</code></h3>
-Receives a string and returns a copy of that string with all
-uppercase letters changed to lowercase.
-All other characters are left unchanged.
-The definition of what is an uppercase letter depends on the current locale.
-
-<p><h3><code>string.rep (s, n)</code></h3>
-Returns a string that is the concatenation of <code>n</code> copies of
-the string <code>s</code>.
-
-<p><h3><code>string.sub (s, i [, j])</code></h3>
-Returns the substring of <code>s</code> that
-starts at <code>i</code> and continues until <code>j</code>;
-<code>i</code> and <code>j</code> may be negative.
-If <code>j</code> is absent, then it is assumed to be equal to <em>-1</em>
-(which is the same as the string length).
-In particular,
-the call <code>string.sub(s,1,j)</code> returns a prefix of <code>s</code>
-with length <code>j</code>,
-and <code>string.sub(s, -i)</code> returns a suffix of <code>s</code>
-with length <code>i</code>.
-
-<p><h3><code>string.upper (s)</code></h3>
-Receives a string and returns a copy of that string with all
-lowercase letters changed to uppercase.
-All other characters are left unchanged.
-The definition of what is a lowercase letter depends on the current locale.
-
-<p><a name="format"><h3><code>string.format (formatstring, e1, e2, ...)</code></h3></a>
-
-Returns a formatted version of its variable number of arguments
-following the description given in its first argument (which must be a string).
-The format string follows the same rules as the <code>printf</code> family of
-standard C functions.
-The only differences are that the options/modifiers
-<code>*</code>, <code>l</code>, <code>L</code>, <code>n</code>, <code>p</code>,
-and <code>h</code> are not supported,
-and there is an extra option, <code>q</code>.
-The <code>q</code> option formats a string in a form suitable to be safely read
-back by the Lua interpreter:
-The string is written between double quotes,
-and all double quotes, newlines, and backslashes in the string
-are correctly escaped when written.
-For instance, the call
-<PRE>
- string.format('%q', 'a string with "quotes" and \n new line')
-</PRE>
-will produce the string:
-<PRE>
-"a string with \"quotes\" and \
- new line"
-</PRE>
-
-<p>The options <code>c</code>, <code>d</code>, <code>E</code>, <code>e</code>, <code>f</code>,
-<code>g</code>, <code>G</code>, <code>i</code>, <code>o</code>, <code>u</code>, <code>X</code>, and <code>x</code> all
-expect a number as argument,
-whereas <code>q</code> and <code>s</code> expect a string.
-The <code>*</code> modifier can be simulated by building
-the appropriate format string.
-For example, <code>"%*g"</code> can be simulated with
-<code>"%"..width.."g"</code>.
-
-<p>String values to be formatted with
-<code>%s</code> cannot contain embedded zeros.
-
-<p><h3><code>string.gfind (s, pat)</code></h3>
-
-<p>Returns an iterator function that,
-each time it is called,
-returns the next captures from pattern <code>pat</code> over string <code>s</code>.
-
-<p>If <code>pat</code> specifies no captures,
-then the whole match is produced in each call.
-
-<p>As an example, the following loop
-<PRE>
- s = "hello world from Lua"
- for w in string.gfind(s, "%a+") do
- print(w)
- end
-</PRE>
-will iterate over all the words from string <code>s</code>,
-printing one per line.
-The next example collects all pairs <code>key=value</code> from the
-given string into a table:
-<PRE>
- t = {}
- s = "from=world, to=Lua"
- for k, v in string.gfind(s, "(%w+)=(%w+)") do
- t[k] = v
- end
-</PRE>
-
-<p><h3><code>string.gsub (s, pat, repl [, n])</code></h3>
-
-Returns a copy of <code>s</code>
-in which all occurrences of the pattern <code>pat</code> have been
-replaced by a replacement string specified by <code>repl</code>.
-<code>gsub</code> also returns, as a second value,
-the total number of substitutions made.
-
-<p>If <code>repl</code> is a string, then its value is used for replacement.
-Any sequence in <code>repl</code> of the form <code>%</code><em>n</em>,
-with <em>n</em> between 1 and 9,
-stands for the value of the <em>n</em>-th captured substring (see below).
-
-<p>If <code>repl</code> is a function, then this function is called every time a
-match occurs, with all captured substrings passed as arguments,
-in order;
-if the pattern specifies no captures,
-then the whole match is passed as a sole argument.
-If the value returned by this function is a string,
-then it is used as the replacement string;
-otherwise, the replacement string is the empty string.
-
-<p>The optional last parameter <code>n</code> limits
-the maximum number of substitutions to occur.
-For instance, when <code>n</code> is 1 only the first occurrence of
-<code>pat</code> is replaced.
-
-<p>Here are some examples:
-<PRE>
- x = string.gsub("hello world", "(%w+)", "%1 %1")
- --> x="hello hello world world"
-
- x = string.gsub("hello world", "(%w+)", "%1 %1", 1)
- --> x="hello hello world"
-
- x = string.gsub("hello world from Lua", "(%w+)%s*(%w+)", "%2 %1")
- --> x="world hello Lua from"
-
- x = string.gsub("home = $HOME, user = $USER", "%$(%w+)", os.getenv)
- --> x="home = /home/roberto, user = roberto"
-
- x = string.gsub("4+5 = $return 4+5$", "%$(.-)%$", function (s)
- return loadstring(s)()
- end)
- --> x="4+5 = 9"
-
- local t = {name="lua", version="5.0"}
- x = string.gsub("$name_$version.tar.gz", "%$(%w+)", function (v)
- return t[v]
- end)
- --> x="lua_5.0.tar.gz"
-</PRE>
-
-<p><a name="pm"><h3>Patterns</h3></a>
-
-<p><p>
-A <em>character class</em> is used to represent a set of characters.
-The following combinations are allowed in describing a character class:
-<ul>
-<li><b><em>x</em></b> (where <em>x</em> is not one of the magic characters
-<code>^$()%.[]*+-?</code>)
---- represents the character <em>x</em> itself.
-<li><b><code>.</code></b> --- (a dot) represents all characters.
-<li><b><code>%a</code></b> --- represents all letters.
-<li><b><code>%c</code></b> --- represents all control characters.
-<li><b><code>%d</code></b> --- represents all digits.
-<li><b><code>%l</code></b> --- represents all lowercase letters.
-<li><b><code>%p</code></b> --- represents all punctuation characters.
-<li><b><code>%s</code></b> --- represents all space characters.
-<li><b><code>%u</code></b> --- represents all uppercase letters.
-<li><b><code>%w</code></b> --- represents all alphanumeric characters.
-<li><b><code>%x</code></b> --- represents all hexadecimal digits.
-<li><b><code>%z</code></b> --- represents the character with representation 0.
-<li><b><code>%<em>x</em></code></b> (where <em>x</em> is any non-alphanumeric character) ---
-represents the character <em>x</em>.
-This is the standard way to escape the magic characters.
-Any punctuation character (even the non magic)
-can be preceded by a `<code>%</code>´
-when used to represent itself in a pattern.
-
-<p><li><b><code>[<em>set</em>]</code></b> ---
-represents the class which is the union of all
-characters in <em>set</em>.
-A range of characters may be specified by
-separating the end characters of the range with a `<code>-</code>´.
-All classes <code>%</code><em>x</em> described above may also be used as
-components in <em>set</em>.
-All other characters in <em>set</em> represent themselves.
-For example, <code>[%w_]</code> (or <code>[_%w]</code>)
-represents all alphanumeric characters plus the underscore,
-<code>[0-7]</code> represents the octal digits,
-and <code>[0-7%l%-]</code> represents the octal digits plus
-the lowercase letters plus the `<code>-</code>´ character.
-
-<p>The interaction between ranges and classes is not defined.
-Therefore, patterns like <code>[%a-z]</code> or <code>[a-%%]</code>
-have no meaning.
-
-<p><li><b><code>[^<em>set</em>]</code></b> ---
-represents the complement of <em>set</em>,
-where <em>set</em> is interpreted as above.
-</ul>
-For all classes represented by single letters (<code>%a</code>, <code>%c</code>, etc.),
-the corresponding uppercase letter represents the complement of the class.
-For instance, <code>%S</code> represents all non-space characters.
-
-<p>The definitions of letter, space, and other character groups
-depend on the current locale.
-In particular, the class <code>[a-z]</code> may not be equivalent to <code>%l</code>.
-The second form should be preferred for portability.
-
-<p><p>
-A <em>pattern item</em> may be
-<ul>
-<li>
-a single character class,
-which matches any single character in the class;
-<li>
-a single character class followed by `<code>*</code>´,
-which matches 0 or more repetitions of characters in the class.
-These repetition items will always match the longest possible sequence;
-<li>
-a single character class followed by `<code>+</code>´,
-which matches 1 or more repetitions of characters in the class.
-These repetition items will always match the longest possible sequence;
-<li>
-a single character class followed by `<code>-</code>´,
-which also matches 0 or more repetitions of characters in the class.
-Unlike `<code>*</code>´,
-these repetition items will always match the <em>shortest</em> possible sequence;
-<li>
-a single character class followed by `<code>?</code>´,
-which matches 0 or 1 occurrence of a character in the class;
-<li>
-<code>%<em>n</em></code>, for <em>n</em> between 1 and 9;
-such item matches a substring equal to the <em>n</em>-th captured string
-(see below);
-<li>
-<code>%b<em>xy</em></code>, where <em>x</em> and <em>y</em> are two distinct characters;
-such item matches strings that start with <em>x</em>, end with <em>y</em>,
-and where the <em>x</em> and <em>y</em> are <em>balanced</em>.
-This means that, if one reads the string from left to right,
-counting <em>+1</em> for an <em>x</em> and <em>-1</em> for a <em>y</em>,
-the ending <em>y</em> is the first <em>y</em> where the count reaches 0.
-For instance, the item <code>%b()</code> matches expressions with
-balanced parentheses.
-</ul>
-
-<p><p>
-A <em>pattern</em> is a sequence of pattern items.
-A `<code>^</code>´ at the beginning of a pattern anchors the match at the
-beginning of the subject string.
-A `<code>$</code>´ at the end of a pattern anchors the match at the
-end of the subject string.
-At other positions,
-`<code>^</code>´ and `<code>$</code>´ have no special meaning and represent themselves.
-
-<p><p>
-A pattern may contain sub-patterns enclosed in parentheses;
-they describe <em>captures</em>.
-When a match succeeds, the substrings of the subject string
-that match captures are stored (<em>captured</em>) for future use.
-Captures are numbered according to their left parentheses.
-For instance, in the pattern <code>"(a*(.)%w(%s*))"</code>,
-the part of the string matching <code>"a*(.)%w(%s*)"</code> is
-stored as the first capture (and therefore has number 1);
-the character matching <code>.</code> is captured with number 2,
-and the part matching <code>%s*</code> has number 3.
-
-<p>As a special case, the empty capture <code>()</code> captures
-the current string position (a number).
-For instance, if we apply the pattern <code>"()aa()"</code> on the
-string <code>"flaaap"</code>, there will be two captures: 3 and 5.
-
-<p>A pattern cannot contain embedded zeros. Use <code>%z</code> instead.
-
-<p><a name="5.4"><h2>5.4 - Table Manipulation</h2></a>
-This library provides generic functions for table manipulation.
-It provides all its functions inside the table <code>table</code>.
-
-<p>Most functions in the table library assume that the table
-represents an array or a list.
-For those functions, an important concept is the <em>size</em> of the array.
-There are three ways to specify that size:
-<ul>
-<li> the field <code>"n"</code> ---
-When the table has a field <code>"n"</code> with a numerical value,
-that value is assumed as its size.
-<li> <code>setn</code> ---
-You can call the <code>table.setn</code> function to explicitly set
-the size of a table.
-<li> implicit size ---
-Otherwise, the size of the object is one less the first integer index
-with a <B>nil</B> value.
-</ul>
-For more details, see the descriptions of the <code>table.getn</code> and
-<code>table.setn</code> functions.
-
-<p><h3><code>table.concat (table [, sep [, i [, j]]])</code></h3>
-
-Returns <code>table[i]..sep..table[i+1] ... sep..table[j]</code>.
-The default value for <code>sep</code> is the empty string,
-the default for <code>i</code> is 1,
-and the default for <code>j</code> is the size of the table.
-If <code>i</code> is greater than <code>j</code>, returns the empty string.
-
-<p><h3><code>table.foreach (table, f)</code></h3>
-Executes the given <code>f</code> over all elements of <code>table</code>.
-For each element, <code>f</code> is called with the index and
-respective value as arguments.
-If <code>f</code> returns a non-<B>nil</B> value,
-then the loop is broken, and this value is returned
-as the final value of <code>foreach</code>.
-
-<p>See the <code>next</code> function for extra information about table traversals.
-
-<p><h3><code>table.foreachi (table, f)</code></h3>
-Executes the given <code>f</code> over the
-numerical indices of <code>table</code>.
-For each index, <code>f</code> is called with the index and
-respective value as arguments.
-Indices are visited in sequential order,
-from 1 to <code>n</code>,
-where <code>n</code> is the size of the table (see <a href="#getn">5.4</a>).
-If <code>f</code> returns a non-<B>nil</B> value,
-then the loop is broken and this value is returned
-as the result of <code>foreachi</code>.
-
-<p><a name="getn"><h3><code>table.getn (table)</code></h3></a>
-Returns the size of a table, when seen as a list.
-If the table has an <code>n</code> field with a numeric value,
-this value is the size of the table.
-Otherwise, if there was a previous call
-to <code>table.setn</code> over this table,
-the respective value is returned.
-Otherwise, the size is one less the first integer index with
-a <B>nil</B> value.
-
-<p><h3><code>table.sort (table [, comp])</code></h3>
-Sorts table elements in a given order, <em>in-place</em>,
-from <code>table[1]</code> to <code>table[n]</code>,
-where <code>n</code> is the size of the table (see <a href="#getn">5.4</a>).
-If <code>comp</code> is given,
-then it must be a function that receives two table elements,
-and returns true
-when the first is less than the second
-(so that <code>not comp(a[i+1],a[i])</code> will be true after the sort).
-If <code>comp</code> is not given,
-then the standard Lua operator <code><</code> is used instead.
-
-<p>The sort algorithm is <em>not</em> stable,
-that is, elements considered equal by the given order
-may have their relative positions changed by the sort.
-
-<p><h3><code>table.insert (table, [pos,] value)</code></h3>
-
-<p>Inserts element <code>value</code> at position <code>pos</code> in <code>table</code>,
-shifting up other elements to open space, if necessary.
-The default value for <code>pos</code> is <code>n+1</code>,
-where <code>n</code> is the size of the table (see <a href="#getn">5.4</a>),
-so that a call <code>table.insert(t,x)</code> inserts <code>x</code> at the end
-of table <code>t</code>.
-This function also updates the size of the table by
-calling <code>table.setn(table, n+1)</code>.
-
-<p><h3><code>table.remove (table [, pos])</code></h3>
-
-<p>Removes from <code>table</code> the element at position <code>pos</code>,
-shifting down other elements to close the space, if necessary.
-Returns the value of the removed element.
-The default value for <code>pos</code> is <code>n</code>,
-where <code>n</code> is the size of the table (see <a href="#getn">5.4</a>),
-so that a call <code>table.remove(t)</code> removes the last element
-of table <code>t</code>.
-This function also updates the size of the table by
-calling <code>table.setn(table, n-1)</code>.
-
-<p><h3><code>table.setn (table, n)</code></h3>
-
-<p>Updates the size of a table.
-If the table has a field <code>"n"</code> with a numerical value,
-that value is changed to the given <code>n</code>.
-Otherwise, it updates an internal state
-so that subsequent calls to <code>table.getn(table)</code> return <code>n</code>.
-
-<p><a name="mathlib"><a name="5.5"><h2>5.5 - Mathematical Functions</h2></a></a>
-
-<p>This library is an interface to most of the functions of the
-standard C math library.
-(Some have slightly different names.)
-It provides all its functions inside the table <code>math</code>.
-In addition,
-it registers the global <code>__pow</code>
-for the binary exponentiation operator <code>^</code>,
-so that <code>x^y</code> returns <em>x<sup>y</sup></em>.
-The library provides the following functions:
-
-
-
-
-
-
-
-
-
-<PRE>
- math.abs math.acos math.asin math.atan math.atan2
- math.ceil math.cos math.deg math.exp math.floor
- math.log math.log10 math.max math.min math.mod
- math.pow math.rad math.sin math.sqrt math.tan
- math.frexp math.ldexp math.random math.randomseed
-</PRE>
-plus a variable <code>math.pi</code>.
-Most of them
-are only interfaces to the corresponding functions in the C library.
-All trigonometric functions work in radians
-(previous versions of Lua used degrees).
-The functions <code>math.deg</code> and <code>math.rad</code> convert
-between radians and degrees.
-
-<p>The function <code>math.max</code> returns the maximum
-value of its numeric arguments.
-Similarly, <code>math.min</code> computes the minimum.
-Both can be used with 1, 2, or more arguments.
-
-<p>The functions <code>math.random</code> and <code>math.randomseed</code>
-are interfaces to the simple random generator functions
-<code>rand</code> and <code>srand</code> that are provided by ANSI C.
-(No guarantees can be given for their statistical properties.)
-When called without arguments,
-<code>math.random</code> returns a pseudo-random real number
-in the range <em>[0,1)</em>.
-When called with a number <em>n</em>,
-<code>math.random</code> returns a pseudo-random integer in the range <em>[1,n]</em>.
-When called with two arguments, <em>l</em> and <em>u</em>,
-<code>math.random</code> returns a pseudo-random integer in the range <em>[l,u]</em>.
-The <code>math.randomseed</code> function sets a "seed"
-for the pseudo-random generator:
-Equal seeds produce equal sequences of numbers.
-
-<p><a name="libio"><a name="5.6"><h2>5.6 - Input and Output Facilities</h2></a></a>
-
-<p>The I/O library provides two different styles for file manipulation.
-The first one uses implicit file descriptors,
-that is, there are operations to set a default input file and a
-default output file,
-and all input/output operations are over those default files.
-The second style uses explicit file descriptors.
-
-<p>When using implicit file descriptors,
-all operations are supplied by table <code>io</code>.
-When using explicit file descriptors,
-the operation <code>io.open</code> returns a file descriptor
-and then all operations are supplied as methods by the file descriptor.
-
-<p>The table <code>io</code> also provides
-three predefined file descriptors with their usual meanings from C:
-<code>io.stdin</code>, <code>io.stdout</code>, and <code>io.stderr</code>.
-
-<p>A file handle is a userdata containing the file stream (<code>FILE*</code>),
-with a distinctive metatable created by the I/O library.
-
-<p>Unless otherwise stated,
-all I/O functions return <B>nil</B> on failure
-(plus an error message as a second result)
-and some value different from <B>nil</B> on success.
-
-<p><h3><code>io.close ([file])</code></h3>
-
-<p>Equivalent to <code>file:close()</code>.
-Without a <code>file</code>, closes the default output file.
-
-<p><h3><code>io.flush ()</code></h3>
-
-<p>Equivalent to <code>file:flush</code> over the default output file.
-
-<p><h3><code>io.input ([file])</code></h3>
-
-<p>When called with a file name, it opens the named file (in text mode),
-and sets its handle as the default input file.
-When called with a file handle,
-it simply sets that file handle as the default input file.
-When called without parameters,
-it returns the current default input file.
-
-<p>In case of errors this function raises the error,
-instead of returning an error code.
-
-<p><h3><code>io.lines ([filename])</code></h3>
-
-<p>Opens the given file name in read mode
-and returns an iterator function that,
-each time it is called,
-returns a new line from the file.
-Therefore, the construction
-<PRE>
- for line in io.lines(filename) do ... end
-</PRE>
-will iterate over all lines of the file.
-When the iterator function detects the end of file,
-it returns <B>nil</B> (to finish the loop) and automatically closes the file.
-
-<p>The call <code>io.lines()</code> (without a file name) is equivalent
-to <code>io.input():lines()</code>, that is, it iterates over the
-lines of the default input file.
-
-<p><h3><code>io.open (filename [, mode])</code></h3>
-
-<p>This function opens a file,
-in the mode specified in the string <code>mode</code>.
-It returns a new file handle,
-or, in case of errors, <B>nil</B> plus an error message.
-
-<p>The <code>mode</code> string can be any of the following:
-<ul>
-<li><b>"r"</b> read mode (the default);
-<li><b>"w"</b> write mode;
-<li><b>"a"</b> append mode;
-<li><b>"r+"</b> update mode, all previous data is preserved;
-<li><b>"w+"</b> update mode, all previous data is erased;
-<li><b>"a+"</b> append update mode, previous data is preserved,
- writing is only allowed at the end of file.
-</ul>
-The <code>mode</code> string may also have a <code>b</code> at the end,
-which is needed in some systems to open the file in binary mode.
-This string is exactly what is used in the standard C function <code>fopen</code>.
-
-<p><h3><code>io.output ([file])</code></h3>
-
-<p>Similar to <code>io.input</code>, but operates over the default output file.
-
-<p><h3><code>io.read (format1, ...)</code></h3>
-
-<p>Equivalent to <code>io.input():read</code>.
-
-<p><h3><code>io.tmpfile ()</code></h3>
-
-<p>Returns a handle for a temporary file.
-This file is open in update mode
-and it is automatically removed when the program ends.
-
-<p><h3><code>io.type (obj)</code></h3>
-
-<p>Checks whether <code>obj</code> is a valid file handle.
-Returns the string <code>"file"</code> if <code>obj</code> is an open file handle,
-<code>"closed file"</code> if <code>obj</code> is a closed file handle,
-and <B>nil</B> if <code>obj</code> is not a file handle.
-
-<p><h3><code>io.write (value1, ...)</code></h3>
-
-<p>Equivalent to <code>io.output():write</code>.
-
-<p><h3><code>file:close ()</code></h3>
-
-<p>Closes <code>file</code>.
-
-<p><h3><code>file:flush ()</code></h3>
-
-<p>Saves any written data to <code>file</code>.
-
-<p><h3><code>file:lines ()</code></h3>
-
-<p>Returns an iterator function that,
-each time it is called,
-returns a new line from the file.
-Therefore, the construction
-<PRE>
- for line in file:lines() do ... end
-</PRE>
-will iterate over all lines of the file.
-(Unlike <code>io.lines</code>, this function does not close the file
-when the loop ends.)
-
-<p><h3><code>file:read (format1, ...)</code></h3>
-
-<p>Reads the file <code>file</code>,
-according to the given formats, which specify what to read.
-For each format,
-the function returns a string (or a number) with the characters read,
-or <B>nil</B> if it cannot read data with the specified format.
-When called without formats,
-it uses a default format that reads the entire next line
-(see below).
-
-<p>The available formats are
-<ul>
-<li><b>"*n"</b> reads a number;
-this is the only format that returns a number instead of a string.
-<li><b>"*a"</b> reads the whole file, starting at the current position.
-On end of file, it returns the empty string.
-<li><b>"*l"</b> reads the next line (skipping the end of line),
-returning <B>nil</B> on end of file.
-This is the default format.
-<li><b><em>number</em></b> reads a string with up to that number of characters,
-returning <B>nil</B> on end of file.
-If number is zero,
-it reads nothing and returns an empty string,
-or <B>nil</B> on end of file.
-</ul>
-
-<p><h3><code>file:seek ([whence] [, offset])</code></h3>
-
-<p>Sets and gets the file position,
-measured from the beginning of the file,
-to the position given by <code>offset</code> plus a base
-specified by the string <code>whence</code>, as follows:
-<ul>
-<li><b>"set"</b> base is position 0 (beginning of the file);
-<li><b>"cur"</b> base is current position;
-<li><b>"end"</b> base is end of file;
-</ul>
-In case of success, function <code>seek</code> returns the final file position,
-measured in bytes from the beginning of the file.
-If this function fails, it returns <B>nil</B>,
-plus a string describing the error.
-
-<p>The default value for <code>whence</code> is <code>"cur"</code>,
-and for <code>offset</code> is 0.
-Therefore, the call <code>file:seek()</code> returns the current
-file position, without changing it;
-the call <code>file:seek("set")</code> sets the position to the
-beginning of the file (and returns 0);
-and the call <code>file:seek("end")</code> sets the position to the
-end of the file, and returns its size.
-
-<p><h3><code>file:write (value1, ...)</code></h3>
-
-<p>Writes the value of each of its arguments to
-the filehandle <code>file</code>.
-The arguments must be strings or numbers.
-To write other values,
-use <code>tostring</code> or <code>string.format</code> before <code>write</code>.
-
-<p><a name="libiosys"><a name="5.7"><h2>5.7 - Operating System Facilities</h2></a></a>
-
-<p>This library is implemented through table <code>os</code>.
-
-<p><h3><code>os.clock ()</code></h3>
-
-<p>Returns an approximation of the amount of CPU time
-used by the program, in seconds.
-
-<p><h3><code>os.date ([format [, time]])</code></h3>
-
-<p>Returns a string or a table containing date and time,
-formatted according to the given string <code>format</code>.
-
-<p>If the <code>time</code> argument is present,
-this is the time to be formatted
-(see the <code>os.time</code> function for a description of this value).
-Otherwise, <code>date</code> formats the current time.
-
-<p>If <code>format</code> starts with `<code>!</code>´,
-then the date is formatted in Coordinated Universal Time.
-After that optional character,
-if <code>format</code> is <code>*t</code>,
-then <code>date</code> returns a table with the following fields:
-<code>year</code> (four digits), <code>month</code> (1--12), <code>day</code> (1--31),
-<code>hour</code> (0--23), <code>min</code> (0--59), <code>sec</code> (0--61),
-<code>wday</code> (weekday, Sunday is 1),
-<code>yday</code> (day of the year),
-and <code>isdst</code> (daylight saving flag, a boolean).
-
-<p>If <code>format</code> is not <code>*t</code>,
-then <code>date</code> returns the date as a string,
-formatted according with the same rules as the C function <code>strftime</code>.
-
-<p>When called without arguments,
-<code>date</code> returns a reasonable date and time representation that depends on
-the host system and on the current locale
-(that is, <code>os.date()</code> is equivalent to <code>os.date("%c")</code>).
-
-<p><h3><code>os.difftime (t2, t1)</code></h3>
-
-<p>Returns the number of seconds from time <code>t1</code> to time <code>t2</code>.
-In Posix, Windows, and some other systems,
-this value is exactly <code>t2</code><em>-</em><code>t1</code>.
-
-<p><h3><code>os.execute (command)</code></h3>
-
-<p>This function is equivalent to the C function <code>system</code>.
-It passes <code>command</code> to be executed by an operating system shell.
-It returns a status code, which is system-dependent.
-
-<p><h3><code>os.exit ([code])</code></h3>
-
-<p>Calls the C function <code>exit</code>,
-with an optional <code>code</code>,
-to terminate the host program.
-The default value for <code>code</code> is the success code.
-
-<p><h3><code>os.getenv (varname)</code></h3>
-
-<p>Returns the value of the process environment variable <code>varname</code>,
-or <B>nil</B> if the variable is not defined.
-
-<p><h3><code>os.remove (filename)</code></h3>
-
-<p>Deletes the file with the given name.
-If this function fails, it returns <B>nil</B>,
-plus a string describing the error.
-
-<p><h3><code>os.rename (oldname, newname)</code></h3>
-
-<p>Renames file named <code>oldname</code> to <code>newname</code>.
-If this function fails, it returns <B>nil</B>,
-plus a string describing the error.
-
-<p><h3><code>os.setlocale (locale [, category])</code></h3>
-
-<p>Sets the current locale of the program.
-<code>locale</code> is a string specifying a locale;
-<code>category</code> is an optional string describing which category to change:
-<code>"all"</code>, <code>"collate"</code>, <code>"ctype"</code>,
-<code>"monetary"</code>, <code>"numeric"</code>, or <code>"time"</code>;
-the default category is <code>"all"</code>.
-The function returns the name of the new locale,
-or <B>nil</B> if the request cannot be honored.
-
-<p><h3><code>os.time ([table])</code></h3>
-
-<p>Returns the current time when called without arguments,
-or a time representing the date and time specified by the given table.
-This table must have fields <code>year</code>, <code>month</code>, and <code>day</code>,
-and may have fields <code>hour</code>, <code>min</code>, <code>sec</code>, and <code>isdst</code>
-(for a description of these fields, see the <code>os.date</code> function).
-
-<p>The returned value is a number, whose meaning depends on your system.
-In Posix, Windows, and some other systems, this number counts the number
-of seconds since some given start time (the "epoch").
-In other systems, the meaning is not specified,
-and the number returned by <code>time</code> can be used only as an argument to
-<code>date</code> and <code>difftime</code>.
-
-<p><h3><code>os.tmpname ()</code></h3>
-
-<p>Returns a string with a file name that can
-be used for a temporary file.
-The file must be explicitly opened before its use
-and removed when no longer needed.
-
-<p>This function is equivalent to the <code>tmpnam</code> C function,
-and many people (and even some compilers!) advise against its use,
-because between the time you call this function
-and the time you open the file,
-it is possible for another process
-to create a file with the same name.
-
-<p><a name="5.8"><h2>5.8 - The Reflexive Debug Interface</h2></a>
-
-<p>The <code>debug</code> library provides
-the functionality of the debug interface to Lua programs.
-You should exert care when using this library.
-The functions provided here should be used exclusively for debugging
-and similar tasks, such as profiling.
-Please resist the temptation to use them as a
-usual programming tool:
-They can be very slow.
-Moreover, <code>setlocal</code> and <code>getlocal</code>
-violate the privacy of local variables
-and therefore can compromise some otherwise secure code.
-
-<p>All functions in this library are provided
-inside a <code>debug</code> table.
-
-<p><h3><code>debug.debug ()</code></h3>
-
-<p>Enters an interactive mode with the user,
-running each string that the user enters.
-Using simple commands and other debug facilities,
-the user can inspect global and local variables,
-change their values, evaluate expressions, and so on.
-A line containing only the word <code>cont</code> finishes this function,
-so that the caller continues its execution.
-
-<p>Note that commands for <code>debug.debug</code> are not lexically nested
-with any function, so they have no direct access to local variables.
-
-<p><h3><code>debug.gethook ()</code></h3>
-
-<p>Returns the current hook settings, as three values:
-the current hook function, the current hook mask,
-and the current hook count (as set by the <code>debug.sethook</code> function).
-
-<p><h3><code>debug.getinfo (function [, what])</code></h3>
-
-<p>This function returns a table with information about a function.
-You can give the function directly,
-or you can give a number as the value of <code>function</code>,
-which means the function running at level <code>function</code> of the call stack:
-Level 0 is the current function (<code>getinfo</code> itself);
-level 1 is the function that called <code>getinfo</code>;
-and so on.
-If <code>function</code> is a number larger than the number of active functions,
-then <code>getinfo</code> returns <B>nil</B>.
-
-<p>The returned table contains all the fields returned by <code>lua_getinfo</code>,
-with the string <code>what</code> describing which fields to fill in.
-The default for <code>what</code> is to get all information available.
-If present,
-the option `<code>f</code>´
-adds a field named <code>func</code> with the function itself.
-
-<p>For instance, the expression <code>debug.getinfo(1,"n").name</code> returns
-the name of the current function, if a reasonable name can be found,
-and <code>debug.getinfo(print)</code> returns a table with all available information
-about the <code>print</code> function.
-
-<p><h3><code>debug.getlocal (level, local)</code></h3>
-
-<p>This function returns the name and the value of the local variable
-with index <code>local</code> of the function at level <code>level</code> of the stack.
-(The first parameter or local variable has index 1, and so on,
-until the last active local variable.)
-The function returns <B>nil</B> if there is no local
-variable with the given index,
-and raises an error when called with a <code>level</code> out of range.
-(You can call <code>debug.getinfo</code> to check whether the level is valid.)
-
-<p><h3><code>debug.getupvalue (func, up)</code></h3>
-
-<p>This function returns the name and the value of the upvalue
-with index <code>up</code> of the function <code>func</code>.
-The function returns <B>nil</B> if there is no upvalue with the given index.
-
-<p><h3><code>debug.setlocal (level, local, value)</code></h3>
-
-<p>This function assigns the value <code>value</code> to the local variable
-with index <code>local</code> of the function at level <code>level</code> of the stack.
-The function returns <B>nil</B> if there is no local
-variable with the given index,
-and raises an error when called with a <code>level</code> out of range.
-(You can call <code>getinfo</code> to check whether the level is valid.)
-
-<p><h3><code>debug.setupvalue (func, up, value)</code></h3>
-
-<p>This function assigns the value <code>value</code> to the upvalue
-with index <code>up</code> of the function <code>func</code>.
-The function returns <B>nil</B> if there is no upvalue
-with the given index.
-
-<p><h3><code>debug.sethook (hook, mask [, count])</code></h3>
-
-
-<p>Sets the given function as a hook.
-The string <code>mask</code> and the number <code>count</code> describe
-when the hook will be called.
-The string mask may have the following characters,
-with the given meaning:
-<ul>
-<li><b><code>"c"</code></b> The hook is called every time Lua calls a function;
-<li><b><code>"r"</code></b> The hook is called every time Lua returns from a function;
-<li><b><code>"l"</code></b> The hook is called every time Lua enters a new line of code.
-</ul>
-With a <code>count</code> different from zero,
-the hook is called after every <code>count</code> instructions.
-
-<p>When called without arguments,
-the <code>debug.sethook</code> function turns off the hook.
-
-<p>When the hook is called, its first parameter is always a string
-describing the event that triggered its call:
-<code>"call"</code>, <code>"return"</code> (or <code>"tail return"</code>),
-<code>"line"</code>, and <code>"count"</code>.
-Moreover, for line events,
-it also gets as its second parameter the new line number.
-Inside a hook,
-you can call <code>getinfo</code> with level 2 to get more information about
-the running function
-(level 0 is the <code>getinfo</code> function,
-and level 1 is the hook function),
-unless the event is <code>"tail return"</code>.
-In this case, Lua is only simulating the return,
-and a call to <code>getinfo</code> will return invalid data.
-
-<p><h3><code>debug.traceback ([message])</code></h3>
-
-<p>Returns a string with a traceback of the call stack.
-An optional <code>message</code> string is appended
-at the beginning of the traceback.
-This function is typically used with <code>xpcall</code> to produce
-better error messages.
-
-<p>
-<a name="lua-sa"><a name="6"><h1>6 - Lua Stand-alone</h1></a></a>
-
-<p>Although Lua has been designed as an extension language,
-to be embedded in a host C program,
-it is also frequently used as a stand-alone language.
-An interpreter for Lua as a stand-alone language,
-called simply <code>lua</code>,
-is provided with the standard distribution.
-The stand-alone interpreter includes
-all standard libraries plus the reflexive debug interface.
-Its usage is:
-<PRE>
- lua [options] [script [args]]
-</PRE>
-The options are:
-<ul>
-<li><b><code>-</code> </b> executes <code>stdin</code> as a file;
-<li><b><code>-e</code> <em>stat</em></b> executes string <em>stat</em>;
-<li><b><code>-l</code> <em>file</em></b> "requires" <em>file</em>;
-<li><b><code>-i</code></b> enters interactive mode after running <em>script</em>;
-<li><b><code>-v</code></b> prints version information;
-<li><b><code>--</code></b> stop handling options.
-</ul>
-After handling its options, <code>lua</code> runs the given <em>script</em>,
-passing to it the given <em>args</em>.
-When called without arguments,
-<code>lua</code> behaves as <code>lua -v -i</code> when <code>stdin</code> is a terminal,
-and as <code>lua -</code> otherwise.
-
-<p>Before running any argument,
-the interpreter checks for an environment variable <code>LUA_INIT</code>.
-If its format is @<em>filename</em>,
-then lua executes the file.
-Otherwise, lua executes the string itself.
-
-<p>All options are handled in order, except <code>-i</code>.
-For instance, an invocation like
-<PRE>
- $ lua -e'a=1' -e 'print(a)' script.lua
-</PRE>
-will first set <code>a</code> to 1, then print <code>a</code>,
-and finally run the file <code>script.lua</code>.
-(Here, <code>$</code> is the shell prompt. Your prompt may be different.)
-
-<p>Before starting to run the script,
-<code>lua</code> collects all arguments in the command line
-in a global table called <code>arg</code>.
-The script name is stored in index 0,
-the first argument after the script name goes to index 1,
-and so on.
-The field <code>n</code> gets the number of arguments after the script name.
-Any arguments before the script name
-(that is, the interpreter name plus the options)
-go to negative indices.
-For instance, in the call
-<PRE>
- $ lua -la.lua b.lua t1 t2
-</PRE>
-the interpreter first runs the file <code>a.lua</code>,
-then creates a table
-<PRE>
- arg = { [-2] = "lua", [-1] = "-la.lua", [0] = "b.lua",
- [1] = "t1", [2] = "t2"; n = 2 }
-</PRE>
-and finally runs the file <code>b.lua</code>.
-
-<p>In interactive mode,
-if you write an incomplete statement,
-the interpreter waits for its completion.
-
-<p>If the global variable <code>_PROMPT</code> is defined as a string,
-then its value is used as the prompt.
-Therefore, the prompt can be changed directly on the command line:
-<PRE>
- $ lua -e"_PROMPT='myprompt> '" -i
-</PRE>
-(the outer pair of quotes is for the shell,
-the inner is for Lua),
-or in any Lua programs by assigning to <code>_PROMPT</code>.
-Note the use of <code>-i</code> to enter interactive mode; otherwise,
-the program would end just after the assignment to <code>_PROMPT</code>.
-
-<p>In Unix systems, Lua scripts can be made into executable programs
-by using <code>chmod +x</code> and the <code>#!</code> form,
-as in
-<PRE>
-#!/usr/local/bin/lua
-</PRE>
-(Of course,
-the location of the Lua interpreter may be different in your machine.
-If <code>lua</code> is in your <code>PATH</code>,
-then
-<PRE>
-#!/usr/bin/env lua
-</PRE>
-is a more portable solution.)
-
-<p>
-<h1>Acknowledgments</h1>
-
-<p>The Lua team is grateful to <a href="http://www.tecgraf.puc-rio.br">Tecgraf</a> for its continued support to Lua.
-We thank everyone at <a href="http://www.tecgraf.puc-rio.br">Tecgraf</a>,
-specially the head of the group, Marcelo Gattass.
-At the risk of omitting several names,
-we also thank the following individuals for supporting,
-contributing to, and spreading the word about Lua:
-Alan Watson.
-André Clinio,
-André Costa,
-Antonio Scuri,
-Asko Kauppi,
-Bret Mogilefsky,
-Cameron Laird,
-Carlos Cassino,
-Carlos Henrique Levy,
-Claudio Terra,
-David Jeske,
-Ed Ferguson,
-Edgar Toernig,
-Erik Hougaard,
-Jim Mathies,
-John Belmonte,
-John Passaniti,
-John Roll,
-Jon Erickson,
-Jon Kleiser,
-Mark Ian Barlow,
-Nick Trout,
-Noemi Rodriguez,
-Norman Ramsey,
-Philippe Lhoste,
-Renata Ratton,
-Renato Borges,
-Renato Cerqueira,
-Reuben Thomas,
-Stephan Herrmann,
-Steve Dekorte,
-Thatcher Ulrich,
-Tomás Gorham,
-Vincent Penquerc'h.
-Thank you!
-
-<p><hr>
-
-<p><h1>Incompatibilities with Previous Versions</h1>
-
-
-<p>Lua 5.0 is a major release.
-There are several incompatibilities with its previous version, Lua 4.0.
-
-<p><h2>Incompatibilities with version 4.0</h2>
-
-<p><h3>Changes in the Language</h3>
-<ul>
-
-<p><li>
-The whole tag-method scheme was replaced by metatables.
-
-<p><li>
-Function calls written between parentheses result in exactly one value.
-
-<p><li>
-A function call as the last expression in a list constructor
-(like <code>{a,b,f()}</code>) has all its return values inserted in the list.
-
-<p><li>
-The precedence of <b>or</b> is smaller than the precedence of <b>and</b>.
-
-<p><li>
-<b>in</b>, <b>false</b>, and <b>true</b> are reserved words.
-
-<p><li>
-The old construction <code>for k,v in t</code>, where <code>t</code> is a table,
-is deprecated (although it is still supported).
-Use <code>for k,v in pairs(t)</code> instead.
-
-<p><li>
-When a literal string of the form <code>[[...]]</code> starts with a newline,
-this newline is ignored.
-
-<p>
-
-<p><li> Upvalues in the form <code>%var</code> are obsolete;
-use external local variables instead.
-
-<p></ul>
-
-<p><h3>Changes in the Libraries</h3>
-<ul>
-
-<p><li>
-Most library functions now are defined inside tables.
-There is a compatibility script (<code>compat.lua</code>) that
-redefine most of them as global names.
-
-<p><li>
-In the math library, angles are expressed in radians.
-With the compatibility script (<code>compat.lua</code>),
-functions still work in degrees.
-
-<p><li>
-The <code>call</code> function is deprecated.
-Use <code>f(unpack(tab))</code> instead of <code>call(f, tab)</code>
-for unprotected calls,
-or the new <code>pcall</code> function for protected calls.
-
-<p><li>
-<code>dofile</code> do not handle errors, but simply propagates them.
-
-<p><li>
-<code>dostring</code> is deprecated. Use <code>loadstring</code> instead.
-
-<p><li>
-The <code>read</code> option <code>*w</code> is obsolete.
-
-<p><li>
-The <code>format</code> option <code>%n$</code> is obsolete.
-
-<p></ul>
-
-<p><h3>Changes in the API</h3>
-<ul>
-
-<p><li>
-<code>lua_open</code> does not have a stack size as its argument
-(stacks are dynamic).
-
-<p><li>
-<code>lua_pushuserdata</code> is deprecated.
-Use <code>lua_newuserdata</code> or <code>lua_pushlightuserdata</code> instead.
-
-<p></ul>
-
-<p>
-
-<a name="BNF"><h1>The Complete Syntax of Lua</h1></a>
-
-
-<p>
-
-<p><pre>
-
-<p> chunk ::= {stat [`<b>;</b>´]}
-
-<p> block ::= chunk
-
-<p> stat ::= varlist1 `<b>=</b>´ explist1 | functioncall | <b>do</b> block <b>end</b> | <b>while</b> exp <b>do</b> block <b>end</b> | <b>repeat</b> block <b>until</b> exp | <b>if</b> exp <b>then</b> block {<b>elseif</b> exp <b>then</b> block} [<b>else</b> block] <b>end</b> | <b>return</b> [explist1] | <b>break</b> | <b>for</b> Name `<b>=</b>´ exp `<b>,</b>´ exp [`<b>,</b>´ exp] <b>do</b> block <b>end</b> | <b>for</b> Name {`<b>,</b>´ Name} <b>in</b> explist1 <b>do</b> block <b>end</b> | <b>function</b> funcname funcbody | <b>local</b> <b>function</b> Name funcbody | <b>local</b> namelist [init]
-
-<p> funcname ::= Name {`<b>.</b>´ Name} [`<b>:</b>´ Name]
-
-<p> varlist1 ::= var {`<b>,</b>´ var}
-
-<p> var ::= Name | prefixexp `<b>[</b>´ exp `<b>]</b>´ | prefixexp `<b>.</b>´ Name
-
-<p> namelist ::= Name {`<b>,</b>´ Name}
-
-<p> init ::= `<b>=</b>´ explist1
-
-<p> explist1 ::= {exp `<b>,</b>´} exp
-
-<p> exp ::= <b>nil</b> | <b>false</b> | <b>true</b> | Number | Literal | function | prefixexp | tableconstructor | exp binop exp | unop exp
-
-<p> prefixexp ::= var | functioncall | `<b>(</b>´ exp `<b>)</b>´
-
-<p> functioncall ::= prefixexp args | prefixexp `<b>:</b>´ Name args
-
-<p> args ::= `<b>(</b>´ [explist1] `<b>)</b>´ | tableconstructor | Literal
-
-<p> function ::= <b>function</b> funcbody
-
-<p> funcbody ::= `<b>(</b>´ [parlist1] `<b>)</b>´ block <b>end</b>
-
-<p> parlist1 ::= Name {`<b>,</b>´ Name} [`<b>,</b>´ `<b>...</b>´] | `<b>...</b>´
-
-<p> tableconstructor ::= `<b>{</b>´ [fieldlist] `<b>}</b>´
- fieldlist ::= field {fieldsep field} [fieldsep]
- field ::= `<b>[</b>´ exp `<b>]</b>´ `<b>=</b>´ exp | name `<b>=</b>´ exp | exp
- fieldsep ::= `<b>,</b>´ | `<b>;</b>´
-
-<p> binop ::= `<b>+</b>´ | `<b>-</b>´ | `<b>*</b>´ | `<b>/</b>´ | `<b>^</b>´ | `<b>..</b>´ | `<b><</b>´ | `<b><=</b>´ | `<b>></b>´ | `<b>>=</b>´ | `<b>==</b>´ | `<b>~=</b>´ | <b>and</b> | <b>or</b>
-
-<p> unop ::= `<b>-</b>´ | <b>not</b>
-
-<p></pre>
-
-<p>
-
-<p>
-
-<HR>
-<SMALL>
-Last update:
-Tue Nov 25 16:08:37 BRST 2003
-</SMALL>
-
-</BODY>
-</HTML>
+++ /dev/null
-<HTML>
-<HEAD>
-<TITLE>Lua documentation</TITLE>
-</HEAD>
-
-<BODY BGCOLOR="#FFFFFF">
-
-<HR>
-<H1>
-<A HREF="http://www.lua.org/"><IMG SRC="logo.gif" ALT="Lua" BORDER=0></A>
-Documentation
-</H1>
-
-<UL>
-<LI><A HREF="http://www.lua.org/">Official web site</A>
-<LI><A HREF="contents.html">Reference manual</A>
-<LI><A HREF="lua.html">lua man page</A>
-<LI><A HREF="luac.html">luac man page</A>
-<LI><A HREF="../README">lua/README</A>
-<LI><A HREF="../src/README">lua/src/README</A>
-<LI><A HREF="../src/lib/README">lua/src/lib/README</A>
-<LI><A HREF="../src/lua/README">lua/src/lua/README</A>
-<LI><A HREF="../src/luac/README">lua/src/luac/README</A>
-<LI><A HREF="../etc/README">lua/etc/README</A>
-<LI><A HREF="../test/README">lua/test/README</A>
-</UL>
-
-<HR>
-<SMALL>
-Last update:
-Thu Mar 11 23:08:56 BRT 2004
-</SMALL>
-
-</BODY>
-</HTML>
+++ /dev/null
-# makefile for Lua etc
-
-LUA= ..
-
-include $(LUA)/config
-
-LIBLUA=$(LIB)/liblua.a
-ALL= bin2c min trace noparser luab
-
-all:
- @echo 'choose a target:' $(ALL)
-
-bin2c: bin2c.c
- $(CC) $(CFLAGS) -o $@ $@.c
-
-min: min.c $(LIBLUA)
- $(CC) $(CFLAGS) -o $@ $@.c -L$(LIB) -llua
-
-trace: trace.c $(LIBLUA)
- $(CC) -g $(CFLAGS) -o $@ $@.c -L$(LIB) -llua -llualib $(EXTRA_LIBS)
-
-noparser: noparser.c
- $(CC) $(CFLAGS) -I$(LUA)/src -o $@.o -c $@.c
-
-luab: noparser $(LIBLUA)
- cc -o $@ noparser.o $(LUA)/src/lua/lua.o -L$(LIB) -llua -llualib $(EXTRA_LIBS)
- $(BIN)/luac $(LUA)/test/hello.lua
- $@ luac.out
- -$@ -e'a=1'
-
-flat:
- cd ..; mkdir flat; mv include/*.h src/*.[ch] src/*/*.[ch] flat
-
-$(LIBLUA):
- cd ../src; $(MAKE)
-
-clean:
- rm -f $(ALL) a.out core *.o luac.out
-
-luser_tests.h: RCS/ltests.h,v
- co -q -M ltests.h
- mv -f ltests.h $@
+++ /dev/null
-This directory contains some useful files and code.
-Unlike the code in ../src, everything here is in the public domain.
-
-bin2c.c
- This program converts files to byte arrays that are automatically run
- with lua_dobuffer. This allows C programs to include all necessary Lua
- code, even in precompiled form. Even if the code is included in source
- form, bin2c is useful because it avoids the hassle of having to quote
- special characters in C strings.
- Example of usage: Run bin2c file1 file2 ... > init.h. Then, in your
- C program, just do #include "init.h" anywhere in the *body* of a
- function. This will be equivalent to calling
- lua_dofile(L,"file1"); lua_dofile(L,"file2"); ...
- Note that the Lua state is called "L". If you use a different name,
- say "mystate", just #define L mystate before you #include "init.h".
-
-compat.lua
- A compatibility module for Lua 4.0 functions.
-
-doall.lua
- Emulate the command line behaviour of Lua 4.0
-
-lua.ico
- A Lua icon for Windows.
- Drawn by hand by Markus Gritsch <gritsch@iue.tuwien.ac.at>.
-
-lua.magic
- Data for teaching file(1) about Lua precompiled chunks.
-
-lua.xpm
- The same icon as lua.ico, but in XPM format.
- It was converted with ImageMagick by Andy Tai <andy@exp.com>.
-
-luser_number.h
- Number type configuration for Lua core.
-
-luser_tests.h
- Self-test configuration for Lua core.
-
-min.c
- A minimal Lua interpreter.
- Good for learning and for starting your own.
-
-noparser.c
- Linking with noparser.o avoids loading the parsing modules in lualib.a.
- Do "make luab" to build a sample Lua intepreter that does not parse
- Lua programs, only loads precompiled programs.
-
-saconfig.c
- Configuration for Lua interpreter.
-
-trace.c
- A simple execution tracer.
- An example of how to use the debug hooks in C.
+++ /dev/null
-/*
-* bin2c.c
-* convert files to byte arrays for automatic loading with lua_dobuffer
-* Luiz Henrique de Figueiredo (lhf@tecgraf.puc-rio.br)
-* 02 Apr 2003 20:44:31
-*/
-
-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-static void dump(FILE* f, int n)
-{
- printf("static const unsigned char B%d[]={\n",n);
- for (n=1;;n++)
- {
- int c=getc(f);
- if (c==EOF) break;
- printf("%3u,",c);
- if (n==20) { putchar('\n'); n=0; }
- }
- printf("\n};\n\n");
-}
-
-static void fdump(const char* fn, int n)
-{
- FILE* f= fopen(fn,"rb"); /* must open in binary mode */
- if (f==NULL)
- {
- fprintf(stderr,"bin2c: cannot open ");
- perror(fn);
- exit(1);
- }
- else
- {
- printf("/* %s */\n",fn);
- dump(f,n);
- fclose(f);
- }
-}
-
-static void emit(const char* fn, int n)
-{
- printf(" lua_dobuffer(L,(const char*)B%d,sizeof(B%d),\"%s\");\n",n,n,fn);
-}
-
-int main(int argc, char* argv[])
-{
- printf("/* code automatically generated by bin2c -- DO NOT EDIT */\n");
- printf("{\n");
- if (argc<2)
- {
- dump(stdin,0);
- emit("=stdin",0);
- }
- else
- {
- int i;
- printf("/* #include'ing this file in a C program is equivalent to calling\n");
- for (i=1; i<argc; i++) printf(" lua_dofile(L,\"%s\");\n",argv[i]);
- printf("*/\n");
- for (i=1; i<argc; i++) fdump(argv[i],i);
- for (i=1; i<argc; i++) emit(argv[i],i);
- }
- printf("}\n");
- return 0;
-}
+++ /dev/null
--------------------------------------------------------------------
--- Real globals
--- _ALERT
--- _ERRORMESSAGE
--- _VERSION
--- _G
--- assert
--- error
--- metatable
--- next
--- print
--- require
--- tonumber
--- tostring
--- type
--- unpack
-
--------------------------------------------------------------------
--- collectgarbage
--- gcinfo
-
--- globals
-
--- call -> protect(f, err)
--- loadfile
--- loadstring
-
--- rawget
--- rawset
-
--- getargs = Main.getargs ??
-
-
-function do_ (f, err)
- if not f then print(err); return end
- local a,b = pcall(f)
- if not a then print(b); return nil
- else return b or true
- end
-end
-
-function dostring(s) return do_(loadstring(s)) end
--- function dofile(s) return do_(loadfile(s)) end
-
--------------------------------------------------------------------
--- Table library
-local tab = table
-foreach = tab.foreach
-foreachi = tab.foreachi
-getn = tab.getn
-tinsert = tab.insert
-tremove = tab.remove
-sort = tab.sort
-
--------------------------------------------------------------------
--- Debug library
-local dbg = debug
-getinfo = dbg.getinfo
-getlocal = dbg.getlocal
-setcallhook = function () error"`setcallhook' is deprecated" end
-setlinehook = function () error"`setlinehook' is deprecated" end
-setlocal = dbg.setlocal
-
--------------------------------------------------------------------
--- math library
-local math = math
-abs = math.abs
-acos = function (x) return math.deg(math.acos(x)) end
-asin = function (x) return math.deg(math.asin(x)) end
-atan = function (x) return math.deg(math.atan(x)) end
-atan2 = function (x,y) return math.deg(math.atan2(x,y)) end
-ceil = math.ceil
-cos = function (x) return math.cos(math.rad(x)) end
-deg = math.deg
-exp = math.exp
-floor = math.floor
-frexp = math.frexp
-ldexp = math.ldexp
-log = math.log
-log10 = math.log10
-max = math.max
-min = math.min
-mod = math.mod
-PI = math.pi
---??? pow = math.pow
-rad = math.rad
-random = math.random
-randomseed = math.randomseed
-sin = function (x) return math.sin(math.rad(x)) end
-sqrt = math.sqrt
-tan = function (x) return math.tan(math.rad(x)) end
-
--------------------------------------------------------------------
--- string library
-local str = string
-strbyte = str.byte
-strchar = str.char
-strfind = str.find
-format = str.format
-gsub = str.gsub
-strlen = str.len
-strlower = str.lower
-strrep = str.rep
-strsub = str.sub
-strupper = str.upper
-
--------------------------------------------------------------------
--- os library
-clock = os.clock
-date = os.date
-difftime = os.difftime
-execute = os.execute --?
-exit = os.exit
-getenv = os.getenv
-remove = os.remove
-rename = os.rename
-setlocale = os.setlocale
-time = os.time
-tmpname = os.tmpname
-
--------------------------------------------------------------------
--- compatibility only
-getglobal = function (n) return _G[n] end
-setglobal = function (n,v) _G[n] = v end
-
--------------------------------------------------------------------
-
-local io, tab = io, table
-
--- IO library (files)
-_STDIN = io.stdin
-_STDERR = io.stderr
-_STDOUT = io.stdout
-_INPUT = io.stdin
-_OUTPUT = io.stdout
-seek = io.stdin.seek -- sick ;-)
-tmpfile = io.tmpfile
-closefile = io.close
-openfile = io.open
-
-function flush (f)
- if f then f:flush()
- else _OUTPUT:flush()
- end
-end
-
-function readfrom (name)
- if name == nil then
- local f, err, cod = io.close(_INPUT)
- _INPUT = io.stdin
- return f, err, cod
- else
- local f, err, cod = io.open(name, "r")
- _INPUT = f or _INPUT
- return f, err, cod
- end
-end
-
-function writeto (name)
- if name == nil then
- local f, err, cod = io.close(_OUTPUT)
- _OUTPUT = io.stdout
- return f, err, cod
- else
- local f, err, cod = io.open(name, "w")
- _OUTPUT = f or _OUTPUT
- return f, err, cod
- end
-end
-
-function appendto (name)
- local f, err, cod = io.open(name, "a")
- _OUTPUT = f or _OUTPUT
- return f, err, cod
-end
-
-function read (...)
- local f = _INPUT
- if type(arg[1]) == 'userdata' then
- f = tab.remove(arg, 1)
- end
- return f:read(unpack(arg))
-end
-
-function write (...)
- local f = _OUTPUT
- if type(arg[1]) == 'userdata' then
- f = tab.remove(arg, 1)
- end
- return f:write(unpack(arg))
-end
-
+++ /dev/null
--- emulate the command line behaviour of Lua 4.0
--- usage: lua doall.lua f1.lua f2.lua f3.lua ...
-
-for i=1,table.getn(arg) do
- dofile(arg[i])
-end
+++ /dev/null
-
-# Lua precompiled files. Versions 2.3 and 4.1 were never officially released.
-0 string \33Lua precompiled chunk for Lua
->4 byte 0x23 2.3*
->4 byte 0x24 2.4
->4 byte 0x25 2.5
->4 byte 0x30 3.0
->4 byte 0x31 3.1
->4 byte 0x32 3.2
->4 byte 0x40 4.0
->4 byte 0x41 4.1*
->4 byte 0x50 5.0
+++ /dev/null
-/* XPM */
-static char *magick[] = {
-/* columns rows colors chars-per-pixel */
-"32 32 6 1",
-" c Gray0",
-". c #000000008080",
-"X c #808080808080",
-"o c #c0c0c0c0c0c0",
-"O c Gray100",
-"+ c None",
-/* pixels */
-"++++++++++++++++++++++++++ooo+++",
-"++++++++++++++++++++++++oX...Xo+",
-"++++++++++++++++++++++++X.....X+",
-"+++++++++++++++++++++++o.......o",
-"+++++++++XX......XX++++o.......o",
-"+++++++X............X++o.......o",
-"+++++o................o+X.....X+",
-"++++X..................XoX...Xo+",
-"+++X..............XXX...X+ooo+++",
-"++o.............XoOOOoX..o++++++",
-"++..............oOOOOOo...++++++",
-"+X.............XOOOOOOOX..X+++++",
-"+..............XOOOOOOOX...+++++",
-"X..............XOOOOOOOX...X++++",
-"X...............oOOOOOo....X++++",
-"................XoOOOoX.....++++",
-"....XO............XXX.......++++",
-"....XO......................++++",
-"....XO.....OX..OX.XOOOo.....++++",
-"....XO.....OX..OX.OoXXOX....++++",
-"....XO.....OX..OX....XOX....++++",
-"X...XO.....OX..OX..OOoOX...X++++",
-"X...XO.....OX..OX.OX..OX...X++++",
-"+...XOXXXX.OoXoOX.OXXXOX...+++++",
-"+X..XOOOOO.XOOXOX.XOOOXo..X+++++",
-"++........................++++++",
-"++o......................o++++++",
-"+++X....................X+++++++",
-"++++X..................X++++++++",
-"+++++o................o+++++++++",
-"+++++++X............X+++++++++++",
-"+++++++++XX......XX+++++++++++++"
-};
+++ /dev/null
-/* luser_number.h -- number type configuration for Lua core
-*
-* #define LUA_USER_H to this file and #define one of USE_* below
-*/
-
-#ifdef USE_DOUBLE
-#define LUA_NUMBER double
-#define LUA_NUMBER_SCAN "%lf"
-#define LUA_NUMBER_FMT "%.14g"
-#endif
-
-#ifdef USE_FLOAT
-#define LUA_NUMBER float
-#define LUA_NUMBER_SCAN "%f"
-#define LUA_NUMBER_FMT "%.5g"
-#endif
-
-#ifdef USE_LONG
-#define LUA_NUMBER long
-#define LUA_NUMBER_SCAN "%ld"
-#define LUA_NUMBER_FMT "%ld"
-#define lua_str2number(s,p) strtol((s), (p), 10)
-#endif
-
-#ifdef USE_INT
-#define LUA_NUMBER int
-#define LUA_NUMBER_SCAN "%d"
-#define LUA_NUMBER_FMT "%d"
-#define lua_str2number(s,p) ((int) strtol((s), (p), 10))
-#endif
-
-#ifdef USE_FASTROUND
-#define lua_number2int(i,d) __asm__("fldl %1\nfistpl %0":"=m"(i):"m"(d))
-#endif
+++ /dev/null
-/*
-** $Id: ltests.h,v 1.20 2002/12/04 17:29:05 roberto Exp $
-** Internal Header for Debugging of the Lua Implementation
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ltests_h
-#define ltests_h
-
-
-#include <stdlib.h>
-
-
-#define LUA_DEBUG
-
-#define LUA_OPNAMES
-
-#undef NDEBUG
-#include <assert.h>
-#define lua_assert(c) assert(c)
-#define check_exp(c,e) (lua_assert(c), (e))
-#define api_check(L, o) lua_assert(o)
-
-
-/* to avoid warnings, and to make sure value is really unused */
-#define UNUSED(x) (x=0, (void)(x))
-
-
-/* memory allocator control variables */
-extern unsigned long memdebug_numblocks;
-extern unsigned long memdebug_total;
-extern unsigned long memdebug_maxmem;
-extern unsigned long memdebug_memlimit;
-
-
-#define l_realloc(b, os, s) debug_realloc(b, os, s)
-#define l_free(b, os) debug_realloc(b, os, 0)
-
-void *debug_realloc (void *block, size_t oldsize, size_t size);
-
-
-
-/* test for lock/unlock */
-extern int islocked;
-#define LUA_USERSTATE int *
-#define getlock(l) (*(cast(LUA_USERSTATE *, l) - 1))
-#define lua_userstateopen(l) if (l != NULL) getlock(l) = &islocked;
-#define lua_lock(l) lua_assert((*getlock(l))++ == 0)
-#define lua_unlock(l) lua_assert(--(*getlock(l)) == 0)
-
-
-int luaB_opentests (lua_State *L);
-
-#define LUA_EXTRALIBS { "tests", luaB_opentests },
-
-
-/* real main will be defined at `ltests.c' */
-int l_main (int argc, char *argv[]);
-#define main l_main
-
-
-
-/* change some sizes to give some bugs a chance */
-
-#define LUAL_BUFFERSIZE 27
-#define MINSTRTABSIZE 2
-
-#endif
+++ /dev/null
-/*
-* min.c -- a minimal Lua interpreter
-* loads stdin only with minimal error handling.
-* no interaction, and no standard library, only a "print" function.
-*/
-
-#include <stdio.h>
-#include "lua.h"
-
-static int print(lua_State *L)
-{
- int n=lua_gettop(L);
- int i;
- for (i=1; i<=n; i++)
- {
- if (i>1) printf("\t");
- if (lua_isstring(L,i))
- printf("%s",lua_tostring(L,i));
- else if (lua_isnil(L,i))
- printf("%s","nil");
- else if (lua_isboolean(L,i))
- printf("%s",lua_toboolean(L,i) ? "true" : "false");
- else
- printf("%s:%p",lua_typename(L,lua_type(L,i)),lua_topointer(L,i));
- }
- printf("\n");
- return 0;
-}
-
-static const char *getF(lua_State *L, void *ud, size_t *size)
-{
- FILE *f=(FILE *)ud;
- static char buff[512];
- if (feof(f)) return NULL;
- *size=fread(buff,1,sizeof(buff),f);
- return (*size>0) ? buff : NULL;
-}
-
-int main(void)
-{
- lua_State *L=lua_open();
- lua_register(L,"print",print);
- if (lua_load(L,getF,stdin,"=stdin") || lua_pcall(L,0,0,0))
- fprintf(stderr,"%s\n",lua_tostring(L,-1));
- return 0;
-}
+++ /dev/null
-/*
-* The code below can be used to make a Lua core that does not contain the
-* parsing modules (lcode, llex, lparser), which represent 35% of the total core.
-* You'll only be able to load binary files and strings, precompiled with luac.
-* (Of course, you'll have to build luac with the original parsing modules!)
-*
-* To use this module, simply compile it ("make noparser" does that) and
-* list its object file before the Lua libraries. The linker should then not
-* load the parsing modules. To try it, do "make luab".
-*/
-
-#include "llex.h"
-#include "lparser.h"
-#include "lzio.h"
-
-void luaX_init (lua_State *L) {
- UNUSED(L);
-}
-
-Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff) {
- UNUSED(z);
- UNUSED(buff);
- lua_pushstring(L,"parser not loaded");
- lua_error(L);
- return NULL;
-}
+++ /dev/null
-/* sa-config.c -- configuration for stand-alone Lua interpreter
-*
-* #define LUA_USERCONFIG to this file
-*
-* Here are the features that can be customized using #define:
-*
-*** Line edit and history:
-* #define USE_READLINE to use the GNU readline library.
-*
-* To use another library for this, use the code below as a start.
-* Make sure you #define lua_readline and lua_saveline accordingly.
-* If you do not #define lua_readline, you'll get a version based on fgets
-* that uses a static buffer of size MAXINPUT.
-*
-*
-*** Static Lua libraries to be loaded at startup:
-* #define lua_userinit(L) to a Lua function that loads libraries; typically
-* #define lua_userinit(L) openstdlibs(L);myinit(L)
-* or
-* #define lua_userinit(L) myinit(L)
-*
-* Another way is to add the prototypes of the init functions here and
-* #define LUA_EXTRALIBS accordingly. For example,
-* #define LUA_EXTRALIBS {"mylib","luaopen_mylib"},
-* Note the ending comma!
-*
-*
-*** Prompts:
-* The stand-alone Lua interpreter uses two prompts: PROMPT and PROMPT2.
-* PROMPT is the primary prompt, shown when the intepreter is ready to receive
-* a new statement. PROMPT2 is the secondary prompt, shown while a statement
-* is being entered but is still incomplete.
-*
-*
-*** Program name:
-* Error messages usually show argv[0] as a program name. In systems that do
-* not give a valid string as argv[0], error messages show PROGNAME instead.
-*
-*
-*/
-
-#ifdef USE_READLINE
-/*
-* This section implements of lua_readline and lua_saveline for lua.c using
-* the GNU readline and history libraries. It should also work with drop-in
-* replacements such as editline and libedit (you may have to include
-* different headers, though).
-*
-*/
-
-#define lua_readline myreadline
-#define lua_saveline mysaveline
-
-#include <ctype.h>
-#include <readline/readline.h>
-#include <readline/history.h>
-
-static int myreadline (lua_State *L, const char *prompt) {
- char *s=readline(prompt);
- if (s==NULL)
- return 0;
- else {
- lua_pushstring(L,s);
- lua_pushliteral(L,"\n");
- lua_concat(L,2);
- free(s);
- return 1;
- }
-}
-
-static void mysaveline (lua_State *L, const char *s) {
- const char *p;
- for (p=s; isspace(*p); p++)
- ;
- if (*p!=0) {
- size_t n=strlen(s)-1;
- if (s[n]!='\n')
- add_history(s);
- else {
- lua_pushlstring(L,s,n);
- s=lua_tostring(L,-1);
- add_history(s);
- lua_remove(L,-1);
- }
- }
-}
-#endif
+++ /dev/null
-/*
-* trace.c -- a simple execution tracer for Lua
-*/
-
-#include <stdio.h>
-#include <string.h>
-#include "lua.h"
-#include "lualib.h"
-#include "lauxlib.h"
-
-static FILE* LOG; /* log file */
-static int I=0; /* indentation level */
-
-static void hook(lua_State *L, lua_Debug *ar)
-{
- const char* s="";
- switch (ar->event)
- {
- case LUA_HOOKTAILRET: ar->event=LUA_HOOKRET;
- case LUA_HOOKRET: s="return"; break;
- case LUA_HOOKCALL: s="call"; break;
- case LUA_HOOKLINE: s="line"; break;
- default: break;
- }
- fprintf(LOG,"[%d]\t%*s%s\t-- %d\n",I,I,"",s,ar->currentline);
- if (ar->event==LUA_HOOKCALL) ++I; else if (ar->event==LUA_HOOKRET) --I;
-}
-
-static void start_trace(lua_State *L, FILE* logfile)
-{
- lua_sethook(L,hook,LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE, 0);
- LOG=logfile;
-}
-
-static void stop_trace(lua_State *L)
-{
- lua_sethook(L,NULL,0,0);
- fclose(LOG);
-}
-
-int main(void)
-{
- int rc;
- lua_State *L=lua_open();
- lua_baselibopen(L);
- lua_tablibopen(L);
- lua_iolibopen(L);
- lua_strlibopen(L);
- lua_mathlibopen(L);
- lua_dblibopen(L);
- start_trace(L,stderr);
- rc=lua_dofile(L,NULL);
- stop_trace(L);
- return rc;
-}
+++ /dev/null
-# makefile for Lua distribution (includes)
-
-LUA= ..
-
-include $(LUA)/config
-
-SRCS= lua.h lualib.h lauxlib.h
-
-all:
-
-clean:
-
-co:
- co -q -f -M $(SRCS)
-
-klean: clean
- rm -f $(SRCS)
+++ /dev/null
-/*
-** $Id: lauxlib.h,v 1.60 2003/04/03 13:35:34 roberto Exp $
-** Auxiliary functions for building Lua libraries
-** See Copyright Notice in lua.h
-*/
-
-
-#ifndef lauxlib_h
-#define lauxlib_h
-
-
-#include <stddef.h>
-#include <stdio.h>
-
-#include "lua.h"
-
-
-#ifndef LUALIB_API
-#define LUALIB_API LUA_API
-#endif
-
-
-
-typedef struct luaL_reg {
- const char *name;
- lua_CFunction func;
-} luaL_reg;
-
-
-LUALIB_API void luaL_openlib (lua_State *L, const char *libname,
- const luaL_reg *l, int nup);
-LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *e);
-LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *e);
-LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname);
-LUALIB_API int luaL_argerror (lua_State *L, int numarg, const char *extramsg);
-LUALIB_API const char *luaL_checklstring (lua_State *L, int numArg, size_t *l);
-LUALIB_API const char *luaL_optlstring (lua_State *L, int numArg,
- const char *def, size_t *l);
-LUALIB_API lua_Number luaL_checknumber (lua_State *L, int numArg);
-LUALIB_API lua_Number luaL_optnumber (lua_State *L, int nArg, lua_Number def);
-
-LUALIB_API void luaL_checkstack (lua_State *L, int sz, const char *msg);
-LUALIB_API void luaL_checktype (lua_State *L, int narg, int t);
-LUALIB_API void luaL_checkany (lua_State *L, int narg);
-
-LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname);
-LUALIB_API void luaL_getmetatable (lua_State *L, const char *tname);
-LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname);
-
-LUALIB_API void luaL_where (lua_State *L, int lvl);
-LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...);
-
-LUALIB_API int luaL_findstring (const char *st, const char *const lst[]);
-
-LUALIB_API int luaL_ref (lua_State *L, int t);
-LUALIB_API void luaL_unref (lua_State *L, int t, int ref);
-
-LUALIB_API int luaL_getn (lua_State *L, int t);
-LUALIB_API void luaL_setn (lua_State *L, int t, int n);
-
-LUALIB_API int luaL_loadfile (lua_State *L, const char *filename);
-LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t sz,
- const char *name);
-
-
-
-/*
-** ===============================================================
-** some useful macros
-** ===============================================================
-*/
-
-#define luaL_argcheck(L, cond,numarg,extramsg) if (!(cond)) \
- luaL_argerror(L, numarg,extramsg)
-#define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL))
-#define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL))
-#define luaL_checkint(L,n) ((int)luaL_checknumber(L, n))
-#define luaL_checklong(L,n) ((long)luaL_checknumber(L, n))
-#define luaL_optint(L,n,d) ((int)luaL_optnumber(L, n,(lua_Number)(d)))
-#define luaL_optlong(L,n,d) ((long)luaL_optnumber(L, n,(lua_Number)(d)))
-
-
-/*
-** {======================================================
-** Generic Buffer manipulation
-** =======================================================
-*/
-
-
-#ifndef LUAL_BUFFERSIZE
-#define LUAL_BUFFERSIZE BUFSIZ
-#endif
-
-
-typedef struct luaL_Buffer {
- char *p; /* current position in buffer */
- int lvl; /* number of strings in the stack (level) */
- lua_State *L;
- char buffer[LUAL_BUFFERSIZE];
-} luaL_Buffer;
-
-#define luaL_putchar(B,c) \
- ((void)((B)->p < ((B)->buffer+LUAL_BUFFERSIZE) || luaL_prepbuffer(B)), \
- (*(B)->p++ = (char)(c)))
-
-#define luaL_addsize(B,n) ((B)->p += (n))
-
-LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B);
-LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B);
-LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l);
-LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s);
-LUALIB_API void luaL_addvalue (luaL_Buffer *B);
-LUALIB_API void luaL_pushresult (luaL_Buffer *B);
-
-
-/* }====================================================== */
-
-
-
-/*
-** Compatibility macros and functions
-*/
-
-LUALIB_API int lua_dofile (lua_State *L, const char *filename);
-LUALIB_API int lua_dostring (lua_State *L, const char *str);
-LUALIB_API int lua_dobuffer (lua_State *L, const char *buff, size_t sz,
- const char *n);
-
-
-#define luaL_check_lstr luaL_checklstring
-#define luaL_opt_lstr luaL_optlstring
-#define luaL_check_number luaL_checknumber
-#define luaL_opt_number luaL_optnumber
-#define luaL_arg_check luaL_argcheck
-#define luaL_check_string luaL_checkstring
-#define luaL_opt_string luaL_optstring
-#define luaL_check_int luaL_checkint
-#define luaL_check_long luaL_checklong
-#define luaL_opt_int luaL_optint
-#define luaL_opt_long luaL_optlong
-
-
-#endif
-
-
+++ /dev/null
-/*
-** $Id: lua.h,v 1.175b 2003/03/18 12:31:39 roberto Exp $
-** Lua - An Extensible Extension Language
-** Tecgraf: Computer Graphics Technology Group, PUC-Rio, Brazil
-** http://www.lua.org mailto:info@lua.org
-** See Copyright Notice at the end of this file
-*/
-
-
-#ifndef lua_h
-#define lua_h
-
-#include <stdarg.h>
-#include <stddef.h>
-
-
-#define LUA_VERSION "Lua 5.0.2"
-#define LUA_COPYRIGHT "Copyright (C) 1994-2004 Tecgraf, PUC-Rio"
-#define LUA_AUTHORS "R. Ierusalimschy, L. H. de Figueiredo & W. Celes"
-
-
-
-/* option for multiple returns in `lua_pcall' and `lua_call' */
-#define LUA_MULTRET (-1)
-
-
-/*
-** pseudo-indices
-*/
-#define LUA_REGISTRYINDEX (-10000)
-#define LUA_GLOBALSINDEX (-10001)
-#define lua_upvalueindex(i) (LUA_GLOBALSINDEX-(i))
-
-
-/* error codes for `lua_load' and `lua_pcall' */
-#define LUA_ERRRUN 1
-#define LUA_ERRFILE 2
-#define LUA_ERRSYNTAX 3
-#define LUA_ERRMEM 4
-#define LUA_ERRERR 5
-
-
-typedef struct lua_State lua_State;
-
-typedef int (*lua_CFunction) (lua_State *L);
-
-
-/*
-** functions that read/write blocks when loading/dumping Lua chunks
-*/
-typedef const char * (*lua_Chunkreader) (lua_State *L, void *ud, size_t *sz);
-
-typedef int (*lua_Chunkwriter) (lua_State *L, const void* p,
- size_t sz, void* ud);
-
-
-/*
-** basic types
-*/
-#define LUA_TNONE (-1)
-
-#define LUA_TNIL 0
-#define LUA_TBOOLEAN 1
-#define LUA_TLIGHTUSERDATA 2
-#define LUA_TNUMBER 3
-#define LUA_TSTRING 4
-#define LUA_TTABLE 5
-#define LUA_TFUNCTION 6
-#define LUA_TUSERDATA 7
-#define LUA_TTHREAD 8
-
-
-/* minimum Lua stack available to a C function */
-#define LUA_MINSTACK 20
-
-
-/*
-** generic extra include file
-*/
-#ifdef LUA_USER_H
-#include LUA_USER_H
-#endif
-
-
-/* type of numbers in Lua */
-#ifndef LUA_NUMBER
-typedef double lua_Number;
-#else
-typedef LUA_NUMBER lua_Number;
-#endif
-
-
-/* mark for all API functions */
-#ifndef LUA_API
-#define LUA_API extern
-#endif
-
-
-/*
-** state manipulation
-*/
-LUA_API lua_State *lua_open (void);
-LUA_API void lua_close (lua_State *L);
-LUA_API lua_State *lua_newthread (lua_State *L);
-
-LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf);
-
-
-/*
-** basic stack manipulation
-*/
-LUA_API int lua_gettop (lua_State *L);
-LUA_API void lua_settop (lua_State *L, int idx);
-LUA_API void lua_pushvalue (lua_State *L, int idx);
-LUA_API void lua_remove (lua_State *L, int idx);
-LUA_API void lua_insert (lua_State *L, int idx);
-LUA_API void lua_replace (lua_State *L, int idx);
-LUA_API int lua_checkstack (lua_State *L, int sz);
-
-LUA_API void lua_xmove (lua_State *from, lua_State *to, int n);
-
-
-/*
-** access functions (stack -> C)
-*/
-
-LUA_API int lua_isnumber (lua_State *L, int idx);
-LUA_API int lua_isstring (lua_State *L, int idx);
-LUA_API int lua_iscfunction (lua_State *L, int idx);
-LUA_API int lua_isuserdata (lua_State *L, int idx);
-LUA_API int lua_type (lua_State *L, int idx);
-LUA_API const char *lua_typename (lua_State *L, int tp);
-
-LUA_API int lua_equal (lua_State *L, int idx1, int idx2);
-LUA_API int lua_rawequal (lua_State *L, int idx1, int idx2);
-LUA_API int lua_lessthan (lua_State *L, int idx1, int idx2);
-
-LUA_API lua_Number lua_tonumber (lua_State *L, int idx);
-LUA_API int lua_toboolean (lua_State *L, int idx);
-LUA_API const char *lua_tostring (lua_State *L, int idx);
-LUA_API size_t lua_strlen (lua_State *L, int idx);
-LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx);
-LUA_API void *lua_touserdata (lua_State *L, int idx);
-LUA_API lua_State *lua_tothread (lua_State *L, int idx);
-LUA_API const void *lua_topointer (lua_State *L, int idx);
-
-
-/*
-** push functions (C -> stack)
-*/
-LUA_API void lua_pushnil (lua_State *L);
-LUA_API void lua_pushnumber (lua_State *L, lua_Number n);
-LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t l);
-LUA_API void lua_pushstring (lua_State *L, const char *s);
-LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
- va_list argp);
-LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...);
-LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n);
-LUA_API void lua_pushboolean (lua_State *L, int b);
-LUA_API void lua_pushlightuserdata (lua_State *L, void *p);
-
-
-/*
-** get functions (Lua -> stack)
-*/
-LUA_API void lua_gettable (lua_State *L, int idx);
-LUA_API void lua_rawget (lua_State *L, int idx);
-LUA_API void lua_rawgeti (lua_State *L, int idx, int n);
-LUA_API void lua_newtable (lua_State *L);
-LUA_API void *lua_newuserdata (lua_State *L, size_t sz);
-LUA_API int lua_getmetatable (lua_State *L, int objindex);
-LUA_API void lua_getfenv (lua_State *L, int idx);
-
-
-/*
-** set functions (stack -> Lua)
-*/
-LUA_API void lua_settable (lua_State *L, int idx);
-LUA_API void lua_rawset (lua_State *L, int idx);
-LUA_API void lua_rawseti (lua_State *L, int idx, int n);
-LUA_API int lua_setmetatable (lua_State *L, int objindex);
-LUA_API int lua_setfenv (lua_State *L, int idx);
-
-
-/*
-** `load' and `call' functions (load and run Lua code)
-*/
-LUA_API void lua_call (lua_State *L, int nargs, int nresults);
-LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc);
-LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud);
-LUA_API int lua_load (lua_State *L, lua_Chunkreader reader, void *dt,
- const char *chunkname);
-
-LUA_API int lua_dump (lua_State *L, lua_Chunkwriter writer, void *data);
-
-
-/*
-** coroutine functions
-*/
-LUA_API int lua_yield (lua_State *L, int nresults);
-LUA_API int lua_resume (lua_State *L, int narg);
-
-/*
-** garbage-collection functions
-*/
-LUA_API int lua_getgcthreshold (lua_State *L);
-LUA_API int lua_getgccount (lua_State *L);
-LUA_API void lua_setgcthreshold (lua_State *L, int newthreshold);
-
-/*
-** miscellaneous functions
-*/
-
-LUA_API const char *lua_version (void);
-
-LUA_API int lua_error (lua_State *L);
-
-LUA_API int lua_next (lua_State *L, int idx);
-
-LUA_API void lua_concat (lua_State *L, int n);
-
-
-
-/*
-** ===============================================================
-** some useful macros
-** ===============================================================
-*/
-
-#define lua_boxpointer(L,u) \
- (*(void **)(lua_newuserdata(L, sizeof(void *))) = (u))
-
-#define lua_unboxpointer(L,i) (*(void **)(lua_touserdata(L, i)))
-
-#define lua_pop(L,n) lua_settop(L, -(n)-1)
-
-#define lua_register(L,n,f) \
- (lua_pushstring(L, n), \
- lua_pushcfunction(L, f), \
- lua_settable(L, LUA_GLOBALSINDEX))
-
-#define lua_pushcfunction(L,f) lua_pushcclosure(L, f, 0)
-
-#define lua_isfunction(L,n) (lua_type(L,n) == LUA_TFUNCTION)
-#define lua_istable(L,n) (lua_type(L,n) == LUA_TTABLE)
-#define lua_islightuserdata(L,n) (lua_type(L,n) == LUA_TLIGHTUSERDATA)
-#define lua_isnil(L,n) (lua_type(L,n) == LUA_TNIL)
-#define lua_isboolean(L,n) (lua_type(L,n) == LUA_TBOOLEAN)
-#define lua_isnone(L,n) (lua_type(L,n) == LUA_TNONE)
-#define lua_isnoneornil(L, n) (lua_type(L,n) <= 0)
-
-#define lua_pushliteral(L, s) \
- lua_pushlstring(L, "" s, (sizeof(s)/sizeof(char))-1)
-
-
-
-/*
-** compatibility macros and functions
-*/
-
-
-LUA_API int lua_pushupvalues (lua_State *L);
-
-#define lua_getregistry(L) lua_pushvalue(L, LUA_REGISTRYINDEX)
-#define lua_setglobal(L,s) \
- (lua_pushstring(L, s), lua_insert(L, -2), lua_settable(L, LUA_GLOBALSINDEX))
-
-#define lua_getglobal(L,s) \
- (lua_pushstring(L, s), lua_gettable(L, LUA_GLOBALSINDEX))
-
-
-/* compatibility with ref system */
-
-/* pre-defined references */
-#define LUA_NOREF (-2)
-#define LUA_REFNIL (-1)
-
-#define lua_ref(L,lock) ((lock) ? luaL_ref(L, LUA_REGISTRYINDEX) : \
- (lua_pushstring(L, "unlocked references are obsolete"), lua_error(L), 0))
-
-#define lua_unref(L,ref) luaL_unref(L, LUA_REGISTRYINDEX, (ref))
-
-#define lua_getref(L,ref) lua_rawgeti(L, LUA_REGISTRYINDEX, ref)
-
-
-
-/*
-** {======================================================================
-** useful definitions for Lua kernel and libraries
-** =======================================================================
-*/
-
-/* formats for Lua numbers */
-#ifndef LUA_NUMBER_SCAN
-#define LUA_NUMBER_SCAN "%lf"
-#endif
-
-#ifndef LUA_NUMBER_FMT
-#define LUA_NUMBER_FMT "%.14g"
-#endif
-
-/* }====================================================================== */
-
-
-/*
-** {======================================================================
-** Debug API
-** =======================================================================
-*/
-
-
-/*
-** Event codes
-*/
-#define LUA_HOOKCALL 0
-#define LUA_HOOKRET 1
-#define LUA_HOOKLINE 2
-#define LUA_HOOKCOUNT 3
-#define LUA_HOOKTAILRET 4
-
-
-/*
-** Event masks
-*/
-#define LUA_MASKCALL (1 << LUA_HOOKCALL)
-#define LUA_MASKRET (1 << LUA_HOOKRET)
-#define LUA_MASKLINE (1 << LUA_HOOKLINE)
-#define LUA_MASKCOUNT (1 << LUA_HOOKCOUNT)
-
-typedef struct lua_Debug lua_Debug; /* activation record */
-
-typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);
-
-
-LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar);
-LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);
-LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n);
-LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n);
-LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n);
-LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n);
-
-LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count);
-LUA_API lua_Hook lua_gethook (lua_State *L);
-LUA_API int lua_gethookmask (lua_State *L);
-LUA_API int lua_gethookcount (lua_State *L);
-
-
-#define LUA_IDSIZE 60
-
-struct lua_Debug {
- int event;
- const char *name; /* (n) */
- const char *namewhat; /* (n) `global', `local', `field', `method' */
- const char *what; /* (S) `Lua', `C', `main', `tail' */
- const char *source; /* (S) */
- int currentline; /* (l) */
- int nups; /* (u) number of upvalues */
- int linedefined; /* (S) */
- char short_src[LUA_IDSIZE]; /* (S) */
- /* private part */
- int i_ci; /* active function */
-};
-
-/* }====================================================================== */
-
-
-/******************************************************************************
-* Copyright (C) 1994-2004 Tecgraf, PUC-Rio. All rights reserved.
-*
-* Permission is hereby granted, free of charge, to any person obtaining
-* a copy of this software and associated documentation files (the
-* "Software"), to deal in the Software without restriction, including
-* without limitation the rights to use, copy, modify, merge, publish,
-* distribute, sublicense, and/or sell copies of the Software, and to
-* permit persons to whom the Software is furnished to do so, subject to
-* the following conditions:
-*
-* The above copyright notice and this permission notice shall be
-* included in all copies or substantial portions of the Software.
-*
-* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-******************************************************************************/
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lualib.h,v 1.28 2003/03/18 12:24:26 roberto Exp $
-** Lua standard libraries
-** See Copyright Notice in lua.h
-*/
-
-
-#ifndef lualib_h
-#define lualib_h
-
-#include "lua.h"
-
-
-#ifndef LUALIB_API
-#define LUALIB_API LUA_API
-#endif
-
-
-#define LUA_COLIBNAME "coroutine"
-LUALIB_API int luaopen_base (lua_State *L);
-
-#define LUA_TABLIBNAME "table"
-LUALIB_API int luaopen_table (lua_State *L);
-
-#define LUA_IOLIBNAME "io"
-#define LUA_OSLIBNAME "os"
-LUALIB_API int luaopen_io (lua_State *L);
-
-#define LUA_STRLIBNAME "string"
-LUALIB_API int luaopen_string (lua_State *L);
-
-#define LUA_MATHLIBNAME "math"
-LUALIB_API int luaopen_math (lua_State *L);
-
-#define LUA_DBLIBNAME "debug"
-LUALIB_API int luaopen_debug (lua_State *L);
-
-
-LUALIB_API int luaopen_loadlib (lua_State *L);
-
-
-/* to help testing the libraries */
-#ifndef lua_assert
-#define lua_assert(c) /* empty */
-#endif
-
-
-/* compatibility code */
-#define lua_baselibopen luaopen_base
-#define lua_tablibopen luaopen_table
-#define lua_iolibopen luaopen_io
-#define lua_strlibopen luaopen_string
-#define lua_mathlibopen luaopen_math
-#define lua_dblibopen luaopen_debug
-
-#endif
+++ /dev/null
-# makefile for Lua core library
-
-LUA= ..
-
-include $(LUA)/config
-
-OBJS= \
- lapi.o \
- lcode.o \
- ldebug.o \
- ldo.o \
- ldump.o \
- lfunc.o \
- lgc.o \
- llex.o \
- lmem.o \
- lobject.o \
- lopcodes.o \
- lparser.o \
- lstate.o \
- lstring.o \
- ltable.o \
- ltests.o \
- ltm.o \
- lundump.o \
- lvm.o \
- lzio.o
-
-SRCS= \
- lapi.c \
- lcode.c \
- ldebug.c \
- ldo.c \
- ldump.c \
- lfunc.c \
- lgc.c \
- llex.c \
- lmem.c \
- lobject.c \
- lopcodes.c \
- lparser.c \
- lstate.c \
- lstring.c \
- ltable.c \
- ltests.c \
- ltm.c \
- lundump.c \
- lvm.c \
- lzio.c \
- lapi.h \
- lcode.h \
- ldebug.h \
- ldo.h \
- lfunc.h \
- lgc.h \
- llex.h \
- llimits.h \
- lmem.h \
- lobject.h \
- lopcodes.h \
- lparser.h \
- lstate.h \
- lstring.h \
- ltable.h \
- ltm.h \
- lundump.h \
- lvm.h \
- lzio.h
-
-T= $(LIB)/liblua.a
-
-all: $T
-
-$T: $(OBJS)
- $(AR) $@ $(OBJS)
- $(RANLIB) $@
-
-clean:
- rm -f $(OBJS) $T
-
-co:
- co -q -f -M $(SRCS)
-
-klean: clean
- rm -f $(SRCS)
+++ /dev/null
-This is the Lua core.
-
-The standard Lua library are in lib/.
-A sample interpreter is in lua/.
-A standalone compiler is in luac/.
+++ /dev/null
-/*
-** $Id: lapi.c,v 1.235 2003/04/07 14:36:08 roberto Exp $
-** Lua API
-** See Copyright Notice in lua.h
-*/
-
-
-#include <assert.h>
-#include <string.h>
-
-#define lapi_c
-
-#include "lua.h"
-
-#include "lapi.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lundump.h"
-#include "lvm.h"
-
-
-const char lua_ident[] =
- "$Lua: " LUA_VERSION " " LUA_COPYRIGHT " $\n"
- "$Authors: " LUA_AUTHORS " $\n"
- "$URL: www.lua.org $\n";
-
-
-
-#ifndef api_check
-#define api_check(L, o) /*{ assert(o); }*/
-#endif
-
-#define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))
-
-#define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;}
-
-
-
-
-static TObject *negindex (lua_State *L, int idx) {
- if (idx > LUA_REGISTRYINDEX) {
- api_check(L, idx != 0 && -idx <= L->top - L->base);
- return L->top+idx;
- }
- else switch (idx) { /* pseudo-indices */
- case LUA_REGISTRYINDEX: return registry(L);
- case LUA_GLOBALSINDEX: return gt(L);
- default: {
- TObject *func = (L->base - 1);
- idx = LUA_GLOBALSINDEX - idx;
- lua_assert(iscfunction(func));
- return (idx <= clvalue(func)->c.nupvalues)
- ? &clvalue(func)->c.upvalue[idx-1]
- : NULL;
- }
- }
-}
-
-
-static TObject *luaA_index (lua_State *L, int idx) {
- if (idx > 0) {
- api_check(L, idx <= L->top - L->base);
- return L->base + idx - 1;
- }
- else {
- TObject *o = negindex(L, idx);
- api_check(L, o != NULL);
- return o;
- }
-}
-
-
-static TObject *luaA_indexAcceptable (lua_State *L, int idx) {
- if (idx > 0) {
- TObject *o = L->base+(idx-1);
- api_check(L, idx <= L->stack_last - L->base);
- if (o >= L->top) return NULL;
- else return o;
- }
- else
- return negindex(L, idx);
-}
-
-
-void luaA_pushobject (lua_State *L, const TObject *o) {
- setobj2s(L->top, o);
- incr_top(L);
-}
-
-
-LUA_API int lua_checkstack (lua_State *L, int size) {
- int res;
- lua_lock(L);
- if ((L->top - L->base + size) > LUA_MAXCSTACK)
- res = 0; /* stack overflow */
- else {
- luaD_checkstack(L, size);
- if (L->ci->top < L->top + size)
- L->ci->top = L->top + size;
- res = 1;
- }
- lua_unlock(L);
- return res;
-}
-
-
-LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
- int i;
- lua_lock(to);
- api_checknelems(from, n);
- from->top -= n;
- for (i = 0; i < n; i++) {
- setobj2s(to->top, from->top + i);
- api_incr_top(to);
- }
- lua_unlock(to);
-}
-
-
-LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
- lua_CFunction old;
- lua_lock(L);
- old = G(L)->panic;
- G(L)->panic = panicf;
- lua_unlock(L);
- return old;
-}
-
-
-LUA_API lua_State *lua_newthread (lua_State *L) {
- lua_State *L1;
- lua_lock(L);
- luaC_checkGC(L);
- L1 = luaE_newthread(L);
- setthvalue(L->top, L1);
- api_incr_top(L);
- lua_unlock(L);
- lua_userstateopen(L1);
- return L1;
-}
-
-
-
-/*
-** basic stack manipulation
-*/
-
-
-LUA_API int lua_gettop (lua_State *L) {
- return (L->top - L->base);
-}
-
-
-LUA_API void lua_settop (lua_State *L, int idx) {
- lua_lock(L);
- if (idx >= 0) {
- api_check(L, idx <= L->stack_last - L->base);
- while (L->top < L->base + idx)
- setnilvalue(L->top++);
- L->top = L->base + idx;
- }
- else {
- api_check(L, -(idx+1) <= (L->top - L->base));
- L->top += idx+1; /* `subtract' index (index is negative) */
- }
- lua_unlock(L);
-}
-
-
-LUA_API void lua_remove (lua_State *L, int idx) {
- StkId p;
- lua_lock(L);
- p = luaA_index(L, idx);
- while (++p < L->top) setobjs2s(p-1, p);
- L->top--;
- lua_unlock(L);
-}
-
-
-LUA_API void lua_insert (lua_State *L, int idx) {
- StkId p;
- StkId q;
- lua_lock(L);
- p = luaA_index(L, idx);
- for (q = L->top; q>p; q--) setobjs2s(q, q-1);
- setobjs2s(p, L->top);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_replace (lua_State *L, int idx) {
- lua_lock(L);
- api_checknelems(L, 1);
- setobj(luaA_index(L, idx), L->top - 1); /* write barrier */
- L->top--;
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushvalue (lua_State *L, int idx) {
- lua_lock(L);
- setobj2s(L->top, luaA_index(L, idx));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-
-/*
-** access functions (stack -> C)
-*/
-
-
-LUA_API int lua_type (lua_State *L, int idx) {
- StkId o = luaA_indexAcceptable(L, idx);
- return (o == NULL) ? LUA_TNONE : ttype(o);
-}
-
-
-LUA_API const char *lua_typename (lua_State *L, int t) {
- UNUSED(L);
- return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
-}
-
-
-LUA_API int lua_iscfunction (lua_State *L, int idx) {
- StkId o = luaA_indexAcceptable(L, idx);
- return (o == NULL) ? 0 : iscfunction(o);
-}
-
-
-LUA_API int lua_isnumber (lua_State *L, int idx) {
- TObject n;
- const TObject *o = luaA_indexAcceptable(L, idx);
- return (o != NULL && tonumber(o, &n));
-}
-
-
-LUA_API int lua_isstring (lua_State *L, int idx) {
- int t = lua_type(L, idx);
- return (t == LUA_TSTRING || t == LUA_TNUMBER);
-}
-
-
-LUA_API int lua_isuserdata (lua_State *L, int idx) {
- const TObject *o = luaA_indexAcceptable(L, idx);
- return (o != NULL && (ttisuserdata(o) || ttislightuserdata(o)));
-}
-
-
-LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
- StkId o1 = luaA_indexAcceptable(L, index1);
- StkId o2 = luaA_indexAcceptable(L, index2);
- return (o1 == NULL || o2 == NULL) ? 0 /* index out of range */
- : luaO_rawequalObj(o1, o2);
-}
-
-
-LUA_API int lua_equal (lua_State *L, int index1, int index2) {
- StkId o1, o2;
- int i;
- lua_lock(L); /* may call tag method */
- o1 = luaA_indexAcceptable(L, index1);
- o2 = luaA_indexAcceptable(L, index2);
- i = (o1 == NULL || o2 == NULL) ? 0 /* index out of range */
- : equalobj(L, o1, o2);
- lua_unlock(L);
- return i;
-}
-
-
-LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
- StkId o1, o2;
- int i;
- lua_lock(L); /* may call tag method */
- o1 = luaA_indexAcceptable(L, index1);
- o2 = luaA_indexAcceptable(L, index2);
- i = (o1 == NULL || o2 == NULL) ? 0 /* index out-of-range */
- : luaV_lessthan(L, o1, o2);
- lua_unlock(L);
- return i;
-}
-
-
-
-LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
- TObject n;
- const TObject *o = luaA_indexAcceptable(L, idx);
- if (o != NULL && tonumber(o, &n))
- return nvalue(o);
- else
- return 0;
-}
-
-
-LUA_API int lua_toboolean (lua_State *L, int idx) {
- const TObject *o = luaA_indexAcceptable(L, idx);
- return (o != NULL) && !l_isfalse(o);
-}
-
-
-LUA_API const char *lua_tostring (lua_State *L, int idx) {
- StkId o = luaA_indexAcceptable(L, idx);
- if (o == NULL)
- return NULL;
- else if (ttisstring(o))
- return svalue(o);
- else {
- const char *s;
- lua_lock(L); /* `luaV_tostring' may create a new string */
- s = (luaV_tostring(L, o) ? svalue(o) : NULL);
- luaC_checkGC(L);
- lua_unlock(L);
- return s;
- }
-}
-
-
-LUA_API size_t lua_strlen (lua_State *L, int idx) {
- StkId o = luaA_indexAcceptable(L, idx);
- if (o == NULL)
- return 0;
- else if (ttisstring(o))
- return tsvalue(o)->tsv.len;
- else {
- size_t l;
- lua_lock(L); /* `luaV_tostring' may create a new string */
- l = (luaV_tostring(L, o) ? tsvalue(o)->tsv.len : 0);
- lua_unlock(L);
- return l;
- }
-}
-
-
-LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
- StkId o = luaA_indexAcceptable(L, idx);
- return (o == NULL || !iscfunction(o)) ? NULL : clvalue(o)->c.f;
-}
-
-
-LUA_API void *lua_touserdata (lua_State *L, int idx) {
- StkId o = luaA_indexAcceptable(L, idx);
- if (o == NULL) return NULL;
- switch (ttype(o)) {
- case LUA_TUSERDATA: return (uvalue(o) + 1);
- case LUA_TLIGHTUSERDATA: return pvalue(o);
- default: return NULL;
- }
-}
-
-
-LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
- StkId o = luaA_indexAcceptable(L, idx);
- return (o == NULL || !ttisthread(o)) ? NULL : thvalue(o);
-}
-
-
-LUA_API const void *lua_topointer (lua_State *L, int idx) {
- StkId o = luaA_indexAcceptable(L, idx);
- if (o == NULL) return NULL;
- else {
- switch (ttype(o)) {
- case LUA_TTABLE: return hvalue(o);
- case LUA_TFUNCTION: return clvalue(o);
- case LUA_TTHREAD: return thvalue(o);
- case LUA_TUSERDATA:
- case LUA_TLIGHTUSERDATA:
- return lua_touserdata(L, idx);
- default: return NULL;
- }
- }
-}
-
-
-
-/*
-** push functions (C -> stack)
-*/
-
-
-LUA_API void lua_pushnil (lua_State *L) {
- lua_lock(L);
- setnilvalue(L->top);
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
- lua_lock(L);
- setnvalue(L->top, n);
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
- lua_lock(L);
- luaC_checkGC(L);
- setsvalue2s(L->top, luaS_newlstr(L, s, len));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushstring (lua_State *L, const char *s) {
- if (s == NULL)
- lua_pushnil(L);
- else
- lua_pushlstring(L, s, strlen(s));
-}
-
-
-LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
- va_list argp) {
- const char *ret;
- lua_lock(L);
- luaC_checkGC(L);
- ret = luaO_pushvfstring(L, fmt, argp);
- lua_unlock(L);
- return ret;
-}
-
-
-LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
- const char *ret;
- va_list argp;
- lua_lock(L);
- luaC_checkGC(L);
- va_start(argp, fmt);
- ret = luaO_pushvfstring(L, fmt, argp);
- va_end(argp);
- lua_unlock(L);
- return ret;
-}
-
-
-LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
- Closure *cl;
- lua_lock(L);
- luaC_checkGC(L);
- api_checknelems(L, n);
- cl = luaF_newCclosure(L, n);
- cl->c.f = fn;
- L->top -= n;
- while (n--)
- setobj2n(&cl->c.upvalue[n], L->top+n);
- setclvalue(L->top, cl);
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushboolean (lua_State *L, int b) {
- lua_lock(L);
- setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
- lua_lock(L);
- setpvalue(L->top, p);
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-
-/*
-** get functions (Lua -> stack)
-*/
-
-
-LUA_API void lua_gettable (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- t = luaA_index(L, idx);
- setobj2s(L->top - 1, luaV_gettable(L, t, L->top - 1, 0));
- lua_unlock(L);
-}
-
-
-LUA_API void lua_rawget (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- t = luaA_index(L, idx);
- api_check(L, ttistable(t));
- setobj2s(L->top - 1, luaH_get(hvalue(t), L->top - 1));
- lua_unlock(L);
-}
-
-
-LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
- StkId o;
- lua_lock(L);
- o = luaA_index(L, idx);
- api_check(L, ttistable(o));
- setobj2s(L->top, luaH_getnum(hvalue(o), n));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_newtable (lua_State *L) {
- lua_lock(L);
- luaC_checkGC(L);
- sethvalue(L->top, luaH_new(L, 0, 0));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API int lua_getmetatable (lua_State *L, int objindex) {
- const TObject *obj;
- Table *mt = NULL;
- int res;
- lua_lock(L);
- obj = luaA_indexAcceptable(L, objindex);
- if (obj != NULL) {
- switch (ttype(obj)) {
- case LUA_TTABLE:
- mt = hvalue(obj)->metatable;
- break;
- case LUA_TUSERDATA:
- mt = uvalue(obj)->uv.metatable;
- break;
- }
- }
- if (mt == NULL || mt == hvalue(defaultmeta(L)))
- res = 0;
- else {
- sethvalue(L->top, mt);
- api_incr_top(L);
- res = 1;
- }
- lua_unlock(L);
- return res;
-}
-
-
-LUA_API void lua_getfenv (lua_State *L, int idx) {
- StkId o;
- lua_lock(L);
- o = luaA_index(L, idx);
- setobj2s(L->top, isLfunction(o) ? &clvalue(o)->l.g : gt(L));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-/*
-** set functions (stack -> Lua)
-*/
-
-
-LUA_API void lua_settable (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- api_checknelems(L, 2);
- t = luaA_index(L, idx);
- luaV_settable(L, t, L->top - 2, L->top - 1);
- L->top -= 2; /* pop index and value */
- lua_unlock(L);
-}
-
-
-LUA_API void lua_rawset (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- api_checknelems(L, 2);
- t = luaA_index(L, idx);
- api_check(L, ttistable(t));
- setobj2t(luaH_set(L, hvalue(t), L->top-2), L->top-1); /* write barrier */
- L->top -= 2;
- lua_unlock(L);
-}
-
-
-LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
- StkId o;
- lua_lock(L);
- api_checknelems(L, 1);
- o = luaA_index(L, idx);
- api_check(L, ttistable(o));
- setobj2t(luaH_setnum(L, hvalue(o), n), L->top-1); /* write barrier */
- L->top--;
- lua_unlock(L);
-}
-
-
-LUA_API int lua_setmetatable (lua_State *L, int objindex) {
- TObject *obj, *mt;
- int res = 1;
- lua_lock(L);
- api_checknelems(L, 1);
- obj = luaA_index(L, objindex);
- mt = (!ttisnil(L->top - 1)) ? L->top - 1 : defaultmeta(L);
- api_check(L, ttistable(mt));
- switch (ttype(obj)) {
- case LUA_TTABLE: {
- hvalue(obj)->metatable = hvalue(mt); /* write barrier */
- break;
- }
- case LUA_TUSERDATA: {
- uvalue(obj)->uv.metatable = hvalue(mt); /* write barrier */
- break;
- }
- default: {
- res = 0; /* cannot set */
- break;
- }
- }
- L->top--;
- lua_unlock(L);
- return res;
-}
-
-
-LUA_API int lua_setfenv (lua_State *L, int idx) {
- StkId o;
- int res = 0;
- lua_lock(L);
- api_checknelems(L, 1);
- o = luaA_index(L, idx);
- L->top--;
- api_check(L, ttistable(L->top));
- if (isLfunction(o)) {
- res = 1;
- clvalue(o)->l.g = *(L->top);
- }
- lua_unlock(L);
- return res;
-}
-
-
-/*
-** `load' and `call' functions (run Lua code)
-*/
-
-LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
- StkId func;
- lua_lock(L);
- api_checknelems(L, nargs+1);
- func = L->top - (nargs+1);
- luaD_call(L, func, nresults);
- lua_unlock(L);
-}
-
-
-
-/*
-** Execute a protected call.
-*/
-struct CallS { /* data to `f_call' */
- StkId func;
- int nresults;
-};
-
-
-static void f_call (lua_State *L, void *ud) {
- struct CallS *c = cast(struct CallS *, ud);
- luaD_call(L, c->func, c->nresults);
-}
-
-
-
-LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
- struct CallS c;
- int status;
- ptrdiff_t func;
- lua_lock(L);
- func = (errfunc == 0) ? 0 : savestack(L, luaA_index(L, errfunc));
- c.func = L->top - (nargs+1); /* function to be called */
- c.nresults = nresults;
- status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
- lua_unlock(L);
- return status;
-}
-
-
-/*
-** Execute a protected C call.
-*/
-struct CCallS { /* data to `f_Ccall' */
- lua_CFunction func;
- void *ud;
-};
-
-
-static void f_Ccall (lua_State *L, void *ud) {
- struct CCallS *c = cast(struct CCallS *, ud);
- Closure *cl;
- cl = luaF_newCclosure(L, 0);
- cl->c.f = c->func;
- setclvalue(L->top, cl); /* push function */
- incr_top(L);
- setpvalue(L->top, c->ud); /* push only argument */
- incr_top(L);
- luaD_call(L, L->top - 2, 0);
-}
-
-
-LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
- struct CCallS c;
- int status;
- lua_lock(L);
- c.func = func;
- c.ud = ud;
- status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
- lua_unlock(L);
- return status;
-}
-
-
-LUA_API int lua_load (lua_State *L, lua_Chunkreader reader, void *data,
- const char *chunkname) {
- ZIO z;
- int status;
- int c;
- lua_lock(L);
- if (!chunkname) chunkname = "?";
- luaZ_init(&z, reader, data, chunkname);
- c = luaZ_lookahead(&z);
- status = luaD_protectedparser(L, &z, (c == LUA_SIGNATURE[0]));
- lua_unlock(L);
- return status;
-}
-
-
-LUA_API int lua_dump (lua_State *L, lua_Chunkwriter writer, void *data) {
- int status;
- TObject *o;
- lua_lock(L);
- api_checknelems(L, 1);
- o = L->top - 1;
- if (isLfunction(o) && clvalue(o)->l.nupvalues == 0) {
- luaU_dump(L, clvalue(o)->l.p, writer, data);
- status = 1;
- }
- else
- status = 0;
- lua_unlock(L);
- return status;
-}
-
-
-/*
-** Garbage-collection functions
-*/
-
-/* GC values are expressed in Kbytes: #bytes/2^10 */
-#define GCscalel(x) ((x)>>10)
-#define GCscale(x) (cast(int, GCscalel(x)))
-#define GCunscale(x) (cast(lu_mem, x)<<10)
-
-LUA_API int lua_getgcthreshold (lua_State *L) {
- int threshold;
- lua_lock(L);
- threshold = GCscale(G(L)->GCthreshold);
- lua_unlock(L);
- return threshold;
-}
-
-LUA_API int lua_getgccount (lua_State *L) {
- int count;
- lua_lock(L);
- count = GCscale(G(L)->nblocks);
- lua_unlock(L);
- return count;
-}
-
-LUA_API void lua_setgcthreshold (lua_State *L, int newthreshold) {
- lua_lock(L);
- if (cast(lu_mem, newthreshold) > GCscalel(MAX_LUMEM))
- G(L)->GCthreshold = MAX_LUMEM;
- else
- G(L)->GCthreshold = GCunscale(newthreshold);
- luaC_checkGC(L);
- lua_unlock(L);
-}
-
-
-/*
-** miscellaneous functions
-*/
-
-
-LUA_API const char *lua_version (void) {
- return LUA_VERSION;
-}
-
-
-LUA_API int lua_error (lua_State *L) {
- lua_lock(L);
- api_checknelems(L, 1);
- luaG_errormsg(L);
- lua_unlock(L);
- return 0; /* to avoid warnings */
-}
-
-
-LUA_API int lua_next (lua_State *L, int idx) {
- StkId t;
- int more;
- lua_lock(L);
- t = luaA_index(L, idx);
- api_check(L, ttistable(t));
- more = luaH_next(L, hvalue(t), L->top - 1);
- if (more) {
- api_incr_top(L);
- }
- else /* no more elements */
- L->top -= 1; /* remove key */
- lua_unlock(L);
- return more;
-}
-
-
-LUA_API void lua_concat (lua_State *L, int n) {
- lua_lock(L);
- luaC_checkGC(L);
- api_checknelems(L, n);
- if (n >= 2) {
- luaV_concat(L, n, L->top - L->base - 1);
- L->top -= (n-1);
- }
- else if (n == 0) { /* push empty string */
- setsvalue2s(L->top, luaS_newlstr(L, NULL, 0));
- api_incr_top(L);
- }
- /* else n == 1; nothing to do */
- lua_unlock(L);
-}
-
-
-LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
- Udata *u;
- lua_lock(L);
- luaC_checkGC(L);
- u = luaS_newudata(L, size);
- setuvalue(L->top, u);
- api_incr_top(L);
- lua_unlock(L);
- return u + 1;
-}
-
-
-LUA_API int lua_pushupvalues (lua_State *L) {
- Closure *func;
- int n, i;
- lua_lock(L);
- api_check(L, iscfunction(L->base - 1));
- func = clvalue(L->base - 1);
- n = func->c.nupvalues;
- luaD_checkstack(L, n + LUA_MINSTACK);
- for (i=0; i<n; i++) {
- setobj2s(L->top, &func->c.upvalue[i]);
- L->top++;
- }
- lua_unlock(L);
- return n;
-}
-
-
-static const char *aux_upvalue (lua_State *L, int funcindex, int n,
- TObject **val) {
- Closure *f;
- StkId fi = luaA_index(L, funcindex);
- if (!ttisfunction(fi)) return NULL;
- f = clvalue(fi);
- if (f->c.isC) {
- if (n > f->c.nupvalues) return NULL;
- *val = &f->c.upvalue[n-1];
- return "";
- }
- else {
- Proto *p = f->l.p;
- if (n > p->sizeupvalues) return NULL;
- *val = f->l.upvals[n-1]->v;
- return getstr(p->upvalues[n-1]);
- }
-}
-
-
-LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
- const char *name;
- TObject *val;
- lua_lock(L);
- name = aux_upvalue(L, funcindex, n, &val);
- if (name) {
- setobj2s(L->top, val);
- api_incr_top(L);
- }
- lua_unlock(L);
- return name;
-}
-
-
-LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
- const char *name;
- TObject *val;
- lua_lock(L);
- api_checknelems(L, 1);
- name = aux_upvalue(L, funcindex, n, &val);
- if (name) {
- L->top--;
- setobj(val, L->top); /* write barrier */
- }
- lua_unlock(L);
- return name;
-}
-
+++ /dev/null
-/*
-** $Id: lapi.h,v 1.21 2002/03/04 21:29:41 roberto Exp $
-** Auxiliary functions from Lua API
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lapi_h
-#define lapi_h
-
-
-#include "lobject.h"
-
-
-void luaA_pushobject (lua_State *L, const TObject *o);
-
-#endif
+++ /dev/null
-/*
-** $Id: lcode.c,v 1.117 2003/04/03 13:35:34 roberto Exp $
-** Code generator for Lua
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-
-#define lcode_c
-
-#include "lua.h"
-
-#include "lcode.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "llex.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lparser.h"
-#include "ltable.h"
-
-
-#define hasjumps(e) ((e)->t != (e)->f)
-
-
-void luaK_nil (FuncState *fs, int from, int n) {
- Instruction *previous;
- if (fs->pc > fs->lasttarget && /* no jumps to current position? */
- GET_OPCODE(*(previous = &fs->f->code[fs->pc-1])) == OP_LOADNIL) {
- int pfrom = GETARG_A(*previous);
- int pto = GETARG_B(*previous);
- if (pfrom <= from && from <= pto+1) { /* can connect both? */
- if (from+n-1 > pto)
- SETARG_B(*previous, from+n-1);
- return;
- }
- }
- luaK_codeABC(fs, OP_LOADNIL, from, from+n-1, 0); /* else no optimization */
-}
-
-
-int luaK_jump (FuncState *fs) {
- int jpc = fs->jpc; /* save list of jumps to here */
- int j;
- fs->jpc = NO_JUMP;
- j = luaK_codeAsBx(fs, OP_JMP, 0, NO_JUMP);
- luaK_concat(fs, &j, jpc); /* keep them on hold */
- return j;
-}
-
-
-static int luaK_condjump (FuncState *fs, OpCode op, int A, int B, int C) {
- luaK_codeABC(fs, op, A, B, C);
- return luaK_jump(fs);
-}
-
-
-static void luaK_fixjump (FuncState *fs, int pc, int dest) {
- Instruction *jmp = &fs->f->code[pc];
- int offset = dest-(pc+1);
- lua_assert(dest != NO_JUMP);
- if (abs(offset) > MAXARG_sBx)
- luaX_syntaxerror(fs->ls, "control structure too long");
- SETARG_sBx(*jmp, offset);
-}
-
-
-/*
-** returns current `pc' and marks it as a jump target (to avoid wrong
-** optimizations with consecutive instructions not in the same basic block).
-*/
-int luaK_getlabel (FuncState *fs) {
- fs->lasttarget = fs->pc;
- return fs->pc;
-}
-
-
-static int luaK_getjump (FuncState *fs, int pc) {
- int offset = GETARG_sBx(fs->f->code[pc]);
- if (offset == NO_JUMP) /* point to itself represents end of list */
- return NO_JUMP; /* end of list */
- else
- return (pc+1)+offset; /* turn offset into absolute position */
-}
-
-
-static Instruction *getjumpcontrol (FuncState *fs, int pc) {
- Instruction *pi = &fs->f->code[pc];
- if (pc >= 1 && testOpMode(GET_OPCODE(*(pi-1)), OpModeT))
- return pi-1;
- else
- return pi;
-}
-
-
-/*
-** check whether list has any jump that do not produce a value
-** (or produce an inverted value)
-*/
-static int need_value (FuncState *fs, int list, int cond) {
- for (; list != NO_JUMP; list = luaK_getjump(fs, list)) {
- Instruction i = *getjumpcontrol(fs, list);
- if (GET_OPCODE(i) != OP_TEST || GETARG_C(i) != cond) return 1;
- }
- return 0; /* not found */
-}
-
-
-static void patchtestreg (Instruction *i, int reg) {
- if (reg == NO_REG) reg = GETARG_B(*i);
- SETARG_A(*i, reg);
-}
-
-
-static void luaK_patchlistaux (FuncState *fs, int list,
- int ttarget, int treg, int ftarget, int freg, int dtarget) {
- while (list != NO_JUMP) {
- int next = luaK_getjump(fs, list);
- Instruction *i = getjumpcontrol(fs, list);
- if (GET_OPCODE(*i) != OP_TEST) {
- lua_assert(dtarget != NO_JUMP);
- luaK_fixjump(fs, list, dtarget); /* jump to default target */
- }
- else {
- if (GETARG_C(*i)) {
- lua_assert(ttarget != NO_JUMP);
- patchtestreg(i, treg);
- luaK_fixjump(fs, list, ttarget);
- }
- else {
- lua_assert(ftarget != NO_JUMP);
- patchtestreg(i, freg);
- luaK_fixjump(fs, list, ftarget);
- }
- }
- list = next;
- }
-}
-
-
-static void luaK_dischargejpc (FuncState *fs) {
- luaK_patchlistaux(fs, fs->jpc, fs->pc, NO_REG, fs->pc, NO_REG, fs->pc);
- fs->jpc = NO_JUMP;
-}
-
-
-void luaK_patchlist (FuncState *fs, int list, int target) {
- if (target == fs->pc)
- luaK_patchtohere(fs, list);
- else {
- lua_assert(target < fs->pc);
- luaK_patchlistaux(fs, list, target, NO_REG, target, NO_REG, target);
- }
-}
-
-
-void luaK_patchtohere (FuncState *fs, int list) {
- luaK_getlabel(fs);
- luaK_concat(fs, &fs->jpc, list);
-}
-
-
-void luaK_concat (FuncState *fs, int *l1, int l2) {
- if (l2 == NO_JUMP) return;
- else if (*l1 == NO_JUMP)
- *l1 = l2;
- else {
- int list = *l1;
- int next;
- while ((next = luaK_getjump(fs, list)) != NO_JUMP) /* find last element */
- list = next;
- luaK_fixjump(fs, list, l2);
- }
-}
-
-
-void luaK_checkstack (FuncState *fs, int n) {
- int newstack = fs->freereg + n;
- if (newstack > fs->f->maxstacksize) {
- if (newstack >= MAXSTACK)
- luaX_syntaxerror(fs->ls, "function or expression too complex");
- fs->f->maxstacksize = cast(lu_byte, newstack);
- }
-}
-
-
-void luaK_reserveregs (FuncState *fs, int n) {
- luaK_checkstack(fs, n);
- fs->freereg += n;
-}
-
-
-static void freereg (FuncState *fs, int reg) {
- if (reg >= fs->nactvar && reg < MAXSTACK) {
- fs->freereg--;
- lua_assert(reg == fs->freereg);
- }
-}
-
-
-static void freeexp (FuncState *fs, expdesc *e) {
- if (e->k == VNONRELOC)
- freereg(fs, e->info);
-}
-
-
-static int addk (FuncState *fs, TObject *k, TObject *v) {
- const TObject *idx = luaH_get(fs->h, k);
- if (ttisnumber(idx)) {
- lua_assert(luaO_rawequalObj(&fs->f->k[cast(int, nvalue(idx))], v));
- return cast(int, nvalue(idx));
- }
- else { /* constant not found; create a new entry */
- Proto *f = fs->f;
- luaM_growvector(fs->L, f->k, fs->nk, f->sizek, TObject,
- MAXARG_Bx, "constant table overflow");
- setobj2n(&f->k[fs->nk], v);
- setnvalue(luaH_set(fs->L, fs->h, k), cast(lua_Number, fs->nk));
- return fs->nk++;
- }
-}
-
-
-int luaK_stringK (FuncState *fs, TString *s) {
- TObject o;
- setsvalue(&o, s);
- return addk(fs, &o, &o);
-}
-
-
-int luaK_numberK (FuncState *fs, lua_Number r) {
- TObject o;
- setnvalue(&o, r);
- return addk(fs, &o, &o);
-}
-
-
-static int nil_constant (FuncState *fs) {
- TObject k, v;
- setnilvalue(&v);
- sethvalue(&k, fs->h); /* cannot use nil as key; instead use table itself */
- return addk(fs, &k, &v);
-}
-
-
-void luaK_setcallreturns (FuncState *fs, expdesc *e, int nresults) {
- if (e->k == VCALL) { /* expression is an open function call? */
- SETARG_C(getcode(fs, e), nresults+1);
- if (nresults == 1) { /* `regular' expression? */
- e->k = VNONRELOC;
- e->info = GETARG_A(getcode(fs, e));
- }
- }
-}
-
-
-void luaK_dischargevars (FuncState *fs, expdesc *e) {
- switch (e->k) {
- case VLOCAL: {
- e->k = VNONRELOC;
- break;
- }
- case VUPVAL: {
- e->info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->info, 0);
- e->k = VRELOCABLE;
- break;
- }
- case VGLOBAL: {
- e->info = luaK_codeABx(fs, OP_GETGLOBAL, 0, e->info);
- e->k = VRELOCABLE;
- break;
- }
- case VINDEXED: {
- freereg(fs, e->aux);
- freereg(fs, e->info);
- e->info = luaK_codeABC(fs, OP_GETTABLE, 0, e->info, e->aux);
- e->k = VRELOCABLE;
- break;
- }
- case VCALL: {
- luaK_setcallreturns(fs, e, 1);
- break;
- }
- default: break; /* there is one value available (somewhere) */
- }
-}
-
-
-static int code_label (FuncState *fs, int A, int b, int jump) {
- luaK_getlabel(fs); /* those instructions may be jump targets */
- return luaK_codeABC(fs, OP_LOADBOOL, A, b, jump);
-}
-
-
-static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
- luaK_dischargevars(fs, e);
- switch (e->k) {
- case VNIL: {
- luaK_nil(fs, reg, 1);
- break;
- }
- case VFALSE: case VTRUE: {
- luaK_codeABC(fs, OP_LOADBOOL, reg, e->k == VTRUE, 0);
- break;
- }
- case VK: {
- luaK_codeABx(fs, OP_LOADK, reg, e->info);
- break;
- }
- case VRELOCABLE: {
- Instruction *pc = &getcode(fs, e);
- SETARG_A(*pc, reg);
- break;
- }
- case VNONRELOC: {
- if (reg != e->info)
- luaK_codeABC(fs, OP_MOVE, reg, e->info, 0);
- break;
- }
- default: {
- lua_assert(e->k == VVOID || e->k == VJMP);
- return; /* nothing to do... */
- }
- }
- e->info = reg;
- e->k = VNONRELOC;
-}
-
-
-static void discharge2anyreg (FuncState *fs, expdesc *e) {
- if (e->k != VNONRELOC) {
- luaK_reserveregs(fs, 1);
- discharge2reg(fs, e, fs->freereg-1);
- }
-}
-
-
-static void luaK_exp2reg (FuncState *fs, expdesc *e, int reg) {
- discharge2reg(fs, e, reg);
- if (e->k == VJMP)
- luaK_concat(fs, &e->t, e->info); /* put this jump in `t' list */
- if (hasjumps(e)) {
- int final; /* position after whole expression */
- int p_f = NO_JUMP; /* position of an eventual LOAD false */
- int p_t = NO_JUMP; /* position of an eventual LOAD true */
- if (need_value(fs, e->t, 1) || need_value(fs, e->f, 0)) {
- int fj = NO_JUMP; /* first jump (over LOAD ops.) */
- if (e->k != VJMP)
- fj = luaK_jump(fs);
- p_f = code_label(fs, reg, 0, 1);
- p_t = code_label(fs, reg, 1, 0);
- luaK_patchtohere(fs, fj);
- }
- final = luaK_getlabel(fs);
- luaK_patchlistaux(fs, e->f, p_f, NO_REG, final, reg, p_f);
- luaK_patchlistaux(fs, e->t, final, reg, p_t, NO_REG, p_t);
- }
- e->f = e->t = NO_JUMP;
- e->info = reg;
- e->k = VNONRELOC;
-}
-
-
-void luaK_exp2nextreg (FuncState *fs, expdesc *e) {
- luaK_dischargevars(fs, e);
- freeexp(fs, e);
- luaK_reserveregs(fs, 1);
- luaK_exp2reg(fs, e, fs->freereg - 1);
-}
-
-
-int luaK_exp2anyreg (FuncState *fs, expdesc *e) {
- luaK_dischargevars(fs, e);
- if (e->k == VNONRELOC) {
- if (!hasjumps(e)) return e->info; /* exp is already in a register */
- if (e->info >= fs->nactvar) { /* reg. is not a local? */
- luaK_exp2reg(fs, e, e->info); /* put value on it */
- return e->info;
- }
- }
- luaK_exp2nextreg(fs, e); /* default */
- return e->info;
-}
-
-
-void luaK_exp2val (FuncState *fs, expdesc *e) {
- if (hasjumps(e))
- luaK_exp2anyreg(fs, e);
- else
- luaK_dischargevars(fs, e);
-}
-
-
-int luaK_exp2RK (FuncState *fs, expdesc *e) {
- luaK_exp2val(fs, e);
- switch (e->k) {
- case VNIL: {
- if (fs->nk + MAXSTACK <= MAXARG_C) { /* constant fit in argC? */
- e->info = nil_constant(fs);
- e->k = VK;
- return e->info + MAXSTACK;
- }
- else break;
- }
- case VK: {
- if (e->info + MAXSTACK <= MAXARG_C) /* constant fit in argC? */
- return e->info + MAXSTACK;
- else break;
- }
- default: break;
- }
- /* not a constant in the right range: put it in a register */
- return luaK_exp2anyreg(fs, e);
-}
-
-
-void luaK_storevar (FuncState *fs, expdesc *var, expdesc *exp) {
- switch (var->k) {
- case VLOCAL: {
- freeexp(fs, exp);
- luaK_exp2reg(fs, exp, var->info);
- return;
- }
- case VUPVAL: {
- int e = luaK_exp2anyreg(fs, exp);
- luaK_codeABC(fs, OP_SETUPVAL, e, var->info, 0);
- break;
- }
- case VGLOBAL: {
- int e = luaK_exp2anyreg(fs, exp);
- luaK_codeABx(fs, OP_SETGLOBAL, e, var->info);
- break;
- }
- case VINDEXED: {
- int e = luaK_exp2RK(fs, exp);
- luaK_codeABC(fs, OP_SETTABLE, var->info, var->aux, e);
- break;
- }
- default: {
- lua_assert(0); /* invalid var kind to store */
- break;
- }
- }
- freeexp(fs, exp);
-}
-
-
-void luaK_self (FuncState *fs, expdesc *e, expdesc *key) {
- int func;
- luaK_exp2anyreg(fs, e);
- freeexp(fs, e);
- func = fs->freereg;
- luaK_reserveregs(fs, 2);
- luaK_codeABC(fs, OP_SELF, func, e->info, luaK_exp2RK(fs, key));
- freeexp(fs, key);
- e->info = func;
- e->k = VNONRELOC;
-}
-
-
-static void invertjump (FuncState *fs, expdesc *e) {
- Instruction *pc = getjumpcontrol(fs, e->info);
- lua_assert(testOpMode(GET_OPCODE(*pc), OpModeT) &&
- GET_OPCODE(*pc) != OP_TEST);
- SETARG_A(*pc, !(GETARG_A(*pc)));
-}
-
-
-static int jumponcond (FuncState *fs, expdesc *e, int cond) {
- if (e->k == VRELOCABLE) {
- Instruction ie = getcode(fs, e);
- if (GET_OPCODE(ie) == OP_NOT) {
- fs->pc--; /* remove previous OP_NOT */
- return luaK_condjump(fs, OP_TEST, NO_REG, GETARG_B(ie), !cond);
- }
- /* else go through */
- }
- discharge2anyreg(fs, e);
- freeexp(fs, e);
- return luaK_condjump(fs, OP_TEST, NO_REG, e->info, cond);
-}
-
-
-void luaK_goiftrue (FuncState *fs, expdesc *e) {
- int pc; /* pc of last jump */
- luaK_dischargevars(fs, e);
- switch (e->k) {
- case VK: case VTRUE: {
- pc = NO_JUMP; /* always true; do nothing */
- break;
- }
- case VFALSE: {
- pc = luaK_jump(fs); /* always jump */
- break;
- }
- case VJMP: {
- invertjump(fs, e);
- pc = e->info;
- break;
- }
- default: {
- pc = jumponcond(fs, e, 0);
- break;
- }
- }
- luaK_concat(fs, &e->f, pc); /* insert last jump in `f' list */
-}
-
-
-void luaK_goiffalse (FuncState *fs, expdesc *e) {
- int pc; /* pc of last jump */
- luaK_dischargevars(fs, e);
- switch (e->k) {
- case VNIL: case VFALSE: {
- pc = NO_JUMP; /* always false; do nothing */
- break;
- }
- case VTRUE: {
- pc = luaK_jump(fs); /* always jump */
- break;
- }
- case VJMP: {
- pc = e->info;
- break;
- }
- default: {
- pc = jumponcond(fs, e, 1);
- break;
- }
- }
- luaK_concat(fs, &e->t, pc); /* insert last jump in `t' list */
-}
-
-
-static void codenot (FuncState *fs, expdesc *e) {
- luaK_dischargevars(fs, e);
- switch (e->k) {
- case VNIL: case VFALSE: {
- e->k = VTRUE;
- break;
- }
- case VK: case VTRUE: {
- e->k = VFALSE;
- break;
- }
- case VJMP: {
- invertjump(fs, e);
- break;
- }
- case VRELOCABLE:
- case VNONRELOC: {
- discharge2anyreg(fs, e);
- freeexp(fs, e);
- e->info = luaK_codeABC(fs, OP_NOT, 0, e->info, 0);
- e->k = VRELOCABLE;
- break;
- }
- default: {
- lua_assert(0); /* cannot happen */
- break;
- }
- }
- /* interchange true and false lists */
- { int temp = e->f; e->f = e->t; e->t = temp; }
-}
-
-
-void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
- t->aux = luaK_exp2RK(fs, k);
- t->k = VINDEXED;
-}
-
-
-void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e) {
- if (op == OPR_MINUS) {
- luaK_exp2val(fs, e);
- if (e->k == VK && ttisnumber(&fs->f->k[e->info]))
- e->info = luaK_numberK(fs, -nvalue(&fs->f->k[e->info]));
- else {
- luaK_exp2anyreg(fs, e);
- freeexp(fs, e);
- e->info = luaK_codeABC(fs, OP_UNM, 0, e->info, 0);
- e->k = VRELOCABLE;
- }
- }
- else /* op == NOT */
- codenot(fs, e);
-}
-
-
-void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {
- switch (op) {
- case OPR_AND: {
- luaK_goiftrue(fs, v);
- luaK_patchtohere(fs, v->t);
- v->t = NO_JUMP;
- break;
- }
- case OPR_OR: {
- luaK_goiffalse(fs, v);
- luaK_patchtohere(fs, v->f);
- v->f = NO_JUMP;
- break;
- }
- case OPR_CONCAT: {
- luaK_exp2nextreg(fs, v); /* operand must be on the `stack' */
- break;
- }
- default: {
- luaK_exp2RK(fs, v);
- break;
- }
- }
-}
-
-
-static void codebinop (FuncState *fs, expdesc *res, BinOpr op,
- int o1, int o2) {
- if (op <= OPR_POW) { /* arithmetic operator? */
- OpCode opc = cast(OpCode, (op - OPR_ADD) + OP_ADD); /* ORDER OP */
- res->info = luaK_codeABC(fs, opc, 0, o1, o2);
- res->k = VRELOCABLE;
- }
- else { /* test operator */
- static const OpCode ops[] = {OP_EQ, OP_EQ, OP_LT, OP_LE, OP_LT, OP_LE};
- int cond = 1;
- if (op >= OPR_GT) { /* `>' or `>='? */
- int temp; /* exchange args and replace by `<' or `<=' */
- temp = o1; o1 = o2; o2 = temp; /* o1 <==> o2 */
- }
- else if (op == OPR_NE) cond = 0;
- res->info = luaK_condjump(fs, ops[op - OPR_NE], cond, o1, o2);
- res->k = VJMP;
- }
-}
-
-
-void luaK_posfix (FuncState *fs, BinOpr op, expdesc *e1, expdesc *e2) {
- switch (op) {
- case OPR_AND: {
- lua_assert(e1->t == NO_JUMP); /* list must be closed */
- luaK_dischargevars(fs, e2);
- luaK_concat(fs, &e1->f, e2->f);
- e1->k = e2->k; e1->info = e2->info; e1->aux = e2->aux; e1->t = e2->t;
- break;
- }
- case OPR_OR: {
- lua_assert(e1->f == NO_JUMP); /* list must be closed */
- luaK_dischargevars(fs, e2);
- luaK_concat(fs, &e1->t, e2->t);
- e1->k = e2->k; e1->info = e2->info; e1->aux = e2->aux; e1->f = e2->f;
- break;
- }
- case OPR_CONCAT: {
- luaK_exp2val(fs, e2);
- if (e2->k == VRELOCABLE && GET_OPCODE(getcode(fs, e2)) == OP_CONCAT) {
- lua_assert(e1->info == GETARG_B(getcode(fs, e2))-1);
- freeexp(fs, e1);
- SETARG_B(getcode(fs, e2), e1->info);
- e1->k = e2->k; e1->info = e2->info;
- }
- else {
- luaK_exp2nextreg(fs, e2);
- freeexp(fs, e2);
- freeexp(fs, e1);
- e1->info = luaK_codeABC(fs, OP_CONCAT, 0, e1->info, e2->info);
- e1->k = VRELOCABLE;
- }
- break;
- }
- default: {
- int o1 = luaK_exp2RK(fs, e1);
- int o2 = luaK_exp2RK(fs, e2);
- freeexp(fs, e2);
- freeexp(fs, e1);
- codebinop(fs, e1, op, o1, o2);
- }
- }
-}
-
-
-void luaK_fixline (FuncState *fs, int line) {
- fs->f->lineinfo[fs->pc - 1] = line;
-}
-
-
-int luaK_code (FuncState *fs, Instruction i, int line) {
- Proto *f = fs->f;
- luaK_dischargejpc(fs); /* `pc' will change */
- /* put new instruction in code array */
- luaM_growvector(fs->L, f->code, fs->pc, f->sizecode, Instruction,
- MAX_INT, "code size overflow");
- f->code[fs->pc] = i;
- /* save corresponding line information */
- luaM_growvector(fs->L, f->lineinfo, fs->pc, f->sizelineinfo, int,
- MAX_INT, "code size overflow");
- f->lineinfo[fs->pc] = line;
- return fs->pc++;
-}
-
-
-int luaK_codeABC (FuncState *fs, OpCode o, int a, int b, int c) {
- lua_assert(getOpMode(o) == iABC);
- return luaK_code(fs, CREATE_ABC(o, a, b, c), fs->ls->lastline);
-}
-
-
-int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) {
- lua_assert(getOpMode(o) == iABx || getOpMode(o) == iAsBx);
- return luaK_code(fs, CREATE_ABx(o, a, bc), fs->ls->lastline);
-}
-
+++ /dev/null
-/*
-** $Id: lcode.h,v 1.38 2002/12/11 12:34:22 roberto Exp $
-** Code generator for Lua
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lcode_h
-#define lcode_h
-
-#include "llex.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lparser.h"
-
-
-/*
-** Marks the end of a patch list. It is an invalid value both as an absolute
-** address, and as a list link (would link an element to itself).
-*/
-#define NO_JUMP (-1)
-
-
-/*
-** grep "ORDER OPR" if you change these enums
-*/
-typedef enum BinOpr {
- OPR_ADD, OPR_SUB, OPR_MULT, OPR_DIV, OPR_POW,
- OPR_CONCAT,
- OPR_NE, OPR_EQ,
- OPR_LT, OPR_LE, OPR_GT, OPR_GE,
- OPR_AND, OPR_OR,
- OPR_NOBINOPR
-} BinOpr;
-
-#define binopistest(op) ((op) >= OPR_NE)
-
-typedef enum UnOpr { OPR_MINUS, OPR_NOT, OPR_NOUNOPR } UnOpr;
-
-
-#define getcode(fs,e) ((fs)->f->code[(e)->info])
-
-#define luaK_codeAsBx(fs,o,A,sBx) luaK_codeABx(fs,o,A,(sBx)+MAXARG_sBx)
-
-int luaK_code (FuncState *fs, Instruction i, int line);
-int luaK_codeABx (FuncState *fs, OpCode o, int A, unsigned int Bx);
-int luaK_codeABC (FuncState *fs, OpCode o, int A, int B, int C);
-void luaK_fixline (FuncState *fs, int line);
-void luaK_nil (FuncState *fs, int from, int n);
-void luaK_reserveregs (FuncState *fs, int n);
-void luaK_checkstack (FuncState *fs, int n);
-int luaK_stringK (FuncState *fs, TString *s);
-int luaK_numberK (FuncState *fs, lua_Number r);
-void luaK_dischargevars (FuncState *fs, expdesc *e);
-int luaK_exp2anyreg (FuncState *fs, expdesc *e);
-void luaK_exp2nextreg (FuncState *fs, expdesc *e);
-void luaK_exp2val (FuncState *fs, expdesc *e);
-int luaK_exp2RK (FuncState *fs, expdesc *e);
-void luaK_self (FuncState *fs, expdesc *e, expdesc *key);
-void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k);
-void luaK_goiftrue (FuncState *fs, expdesc *e);
-void luaK_goiffalse (FuncState *fs, expdesc *e);
-void luaK_storevar (FuncState *fs, expdesc *var, expdesc *e);
-void luaK_setcallreturns (FuncState *fs, expdesc *var, int nresults);
-int luaK_jump (FuncState *fs);
-void luaK_patchlist (FuncState *fs, int list, int target);
-void luaK_patchtohere (FuncState *fs, int list);
-void luaK_concat (FuncState *fs, int *l1, int l2);
-int luaK_getlabel (FuncState *fs);
-void luaK_prefix (FuncState *fs, UnOpr op, expdesc *v);
-void luaK_infix (FuncState *fs, BinOpr op, expdesc *v);
-void luaK_posfix (FuncState *fs, BinOpr op, expdesc *v1, expdesc *v2);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: ldebug.c,v 1.150 2003/03/19 21:24:04 roberto Exp $
-** Debug Interface
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-#include <string.h>
-
-#define ldebug_c
-
-#include "lua.h"
-
-#include "lapi.h"
-#include "lcode.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lvm.h"
-
-
-
-static const char *getfuncname (CallInfo *ci, const char **name);
-
-
-#define isLua(ci) (!((ci)->state & CI_C))
-
-
-static int currentpc (CallInfo *ci) {
- if (!isLua(ci)) return -1; /* function is not a Lua function? */
- if (ci->state & CI_HASFRAME) /* function has a frame? */
- ci->u.l.savedpc = *ci->u.l.pc; /* use `pc' from there */
- /* function's pc is saved */
- return pcRel(ci->u.l.savedpc, ci_func(ci)->l.p);
-}
-
-
-static int currentline (CallInfo *ci) {
- int pc = currentpc(ci);
- if (pc < 0)
- return -1; /* only active lua functions have current-line information */
- else
- return getline(ci_func(ci)->l.p, pc);
-}
-
-
-void luaG_inithooks (lua_State *L) {
- CallInfo *ci;
- for (ci = L->ci; ci != L->base_ci; ci--) /* update all `savedpc's */
- currentpc(ci);
- L->hookinit = 1;
-}
-
-
-/*
-** this function can be called asynchronous (e.g. during a signal)
-*/
-LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
- if (func == NULL || mask == 0) { /* turn off hooks? */
- mask = 0;
- func = NULL;
- }
- L->hook = func;
- L->basehookcount = count;
- resethookcount(L);
- L->hookmask = cast(lu_byte, mask);
- L->hookinit = 0;
- return 1;
-}
-
-
-LUA_API lua_Hook lua_gethook (lua_State *L) {
- return L->hook;
-}
-
-
-LUA_API int lua_gethookmask (lua_State *L) {
- return L->hookmask;
-}
-
-
-LUA_API int lua_gethookcount (lua_State *L) {
- return L->basehookcount;
-}
-
-
-LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
- int status;
- CallInfo *ci;
- lua_lock(L);
- for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
- level--;
- if (!(ci->state & CI_C)) /* Lua function? */
- level -= ci->u.l.tailcalls; /* skip lost tail calls */
- }
- if (level > 0 || ci == L->base_ci) status = 0; /* there is no such level */
- else if (level < 0) { /* level is of a lost tail call */
- status = 1;
- ar->i_ci = 0;
- }
- else {
- status = 1;
- ar->i_ci = ci - L->base_ci;
- }
- lua_unlock(L);
- return status;
-}
-
-
-static Proto *getluaproto (CallInfo *ci) {
- return (isLua(ci) ? ci_func(ci)->l.p : NULL);
-}
-
-
-LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
- const char *name;
- CallInfo *ci;
- Proto *fp;
- lua_lock(L);
- name = NULL;
- ci = L->base_ci + ar->i_ci;
- fp = getluaproto(ci);
- if (fp) { /* is a Lua function? */
- name = luaF_getlocalname(fp, n, currentpc(ci));
- if (name)
- luaA_pushobject(L, ci->base+(n-1)); /* push value */
- }
- lua_unlock(L);
- return name;
-}
-
-
-LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
- const char *name;
- CallInfo *ci;
- Proto *fp;
- lua_lock(L);
- name = NULL;
- ci = L->base_ci + ar->i_ci;
- fp = getluaproto(ci);
- L->top--; /* pop new value */
- if (fp) { /* is a Lua function? */
- name = luaF_getlocalname(fp, n, currentpc(ci));
- if (!name || name[0] == '(') /* `(' starts private locals */
- name = NULL;
- else
- setobjs2s(ci->base+(n-1), L->top);
- }
- lua_unlock(L);
- return name;
-}
-
-
-static void funcinfo (lua_Debug *ar, StkId func) {
- Closure *cl = clvalue(func);
- if (cl->c.isC) {
- ar->source = "=[C]";
- ar->linedefined = -1;
- ar->what = "C";
- }
- else {
- ar->source = getstr(cl->l.p->source);
- ar->linedefined = cl->l.p->lineDefined;
- ar->what = (ar->linedefined == 0) ? "main" : "Lua";
- }
- luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
-}
-
-
-static const char *travglobals (lua_State *L, const TObject *o) {
- Table *g = hvalue(gt(L));
- int i = sizenode(g);
- while (i--) {
- Node *n = gnode(g, i);
- if (luaO_rawequalObj(o, gval(n)) && ttisstring(gkey(n)))
- return getstr(tsvalue(gkey(n)));
- }
- return NULL;
-}
-
-
-static void info_tailcall (lua_State *L, lua_Debug *ar) {
- ar->name = ar->namewhat = "";
- ar->what = "tail";
- ar->linedefined = ar->currentline = -1;
- ar->source = "=(tail call)";
- luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
- ar->nups = 0;
- setnilvalue(L->top);
-}
-
-
-static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
- StkId f, CallInfo *ci) {
- int status = 1;
- for (; *what; what++) {
- switch (*what) {
- case 'S': {
- funcinfo(ar, f);
- break;
- }
- case 'l': {
- ar->currentline = (ci) ? currentline(ci) : -1;
- break;
- }
- case 'u': {
- ar->nups = clvalue(f)->c.nupvalues;
- break;
- }
- case 'n': {
- ar->namewhat = (ci) ? getfuncname(ci, &ar->name) : NULL;
- if (ar->namewhat == NULL) {
- /* try to find a global name */
- if ((ar->name = travglobals(L, f)) != NULL)
- ar->namewhat = "global";
- else ar->namewhat = ""; /* not found */
- }
- break;
- }
- case 'f': {
- setobj2s(L->top, f);
- break;
- }
- default: status = 0; /* invalid option */
- }
- }
- return status;
-}
-
-
-LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
- int status = 1;
- lua_lock(L);
- if (*what == '>') {
- StkId f = L->top - 1;
- if (!ttisfunction(f))
- luaG_runerror(L, "value for `lua_getinfo' is not a function");
- status = auxgetinfo(L, what + 1, ar, f, NULL);
- L->top--; /* pop function */
- }
- else if (ar->i_ci != 0) { /* no tail call? */
- CallInfo *ci = L->base_ci + ar->i_ci;
- lua_assert(ttisfunction(ci->base - 1));
- status = auxgetinfo(L, what, ar, ci->base - 1, ci);
- }
- else
- info_tailcall(L, ar);
- if (strchr(what, 'f')) incr_top(L);
- lua_unlock(L);
- return status;
-}
-
-
-/*
-** {======================================================
-** Symbolic Execution and code checker
-** =======================================================
-*/
-
-#define check(x) if (!(x)) return 0;
-
-#define checkjump(pt,pc) check(0 <= pc && pc < pt->sizecode)
-
-#define checkreg(pt,reg) check((reg) < (pt)->maxstacksize)
-
-
-
-static int precheck (const Proto *pt) {
- check(pt->maxstacksize <= MAXSTACK);
- check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0);
- lua_assert(pt->numparams+pt->is_vararg <= pt->maxstacksize);
- check(GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN);
- return 1;
-}
-
-
-static int checkopenop (const Proto *pt, int pc) {
- Instruction i = pt->code[pc+1];
- switch (GET_OPCODE(i)) {
- case OP_CALL:
- case OP_TAILCALL:
- case OP_RETURN: {
- check(GETARG_B(i) == 0);
- return 1;
- }
- case OP_SETLISTO: return 1;
- default: return 0; /* invalid instruction after an open call */
- }
-}
-
-
-static int checkRK (const Proto *pt, int r) {
- return (r < pt->maxstacksize || (r >= MAXSTACK && r-MAXSTACK < pt->sizek));
-}
-
-
-static Instruction luaG_symbexec (const Proto *pt, int lastpc, int reg) {
- int pc;
- int last; /* stores position of last instruction that changed `reg' */
- last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */
- check(precheck(pt));
- for (pc = 0; pc < lastpc; pc++) {
- const Instruction i = pt->code[pc];
- OpCode op = GET_OPCODE(i);
- int a = GETARG_A(i);
- int b = 0;
- int c = 0;
- checkreg(pt, a);
- switch (getOpMode(op)) {
- case iABC: {
- b = GETARG_B(i);
- c = GETARG_C(i);
- if (testOpMode(op, OpModeBreg)) {
- checkreg(pt, b);
- }
- else if (testOpMode(op, OpModeBrk))
- check(checkRK(pt, b));
- if (testOpMode(op, OpModeCrk))
- check(checkRK(pt, c));
- break;
- }
- case iABx: {
- b = GETARG_Bx(i);
- if (testOpMode(op, OpModeK)) check(b < pt->sizek);
- break;
- }
- case iAsBx: {
- b = GETARG_sBx(i);
- break;
- }
- }
- if (testOpMode(op, OpModesetA)) {
- if (a == reg) last = pc; /* change register `a' */
- }
- if (testOpMode(op, OpModeT)) {
- check(pc+2 < pt->sizecode); /* check skip */
- check(GET_OPCODE(pt->code[pc+1]) == OP_JMP);
- }
- switch (op) {
- case OP_LOADBOOL: {
- check(c == 0 || pc+2 < pt->sizecode); /* check its jump */
- break;
- }
- case OP_LOADNIL: {
- if (a <= reg && reg <= b)
- last = pc; /* set registers from `a' to `b' */
- break;
- }
- case OP_GETUPVAL:
- case OP_SETUPVAL: {
- check(b < pt->nups);
- break;
- }
- case OP_GETGLOBAL:
- case OP_SETGLOBAL: {
- check(ttisstring(&pt->k[b]));
- break;
- }
- case OP_SELF: {
- checkreg(pt, a+1);
- if (reg == a+1) last = pc;
- break;
- }
- case OP_CONCAT: {
- /* `c' is a register, and at least two operands */
- check(c < MAXSTACK && b < c);
- break;
- }
- case OP_TFORLOOP:
- checkreg(pt, a+c+5);
- if (reg >= a) last = pc; /* affect all registers above base */
- /* go through */
- case OP_FORLOOP:
- checkreg(pt, a+2);
- /* go through */
- case OP_JMP: {
- int dest = pc+1+b;
- check(0 <= dest && dest < pt->sizecode);
- /* not full check and jump is forward and do not skip `lastpc'? */
- if (reg != NO_REG && pc < dest && dest <= lastpc)
- pc += b; /* do the jump */
- break;
- }
- case OP_CALL:
- case OP_TAILCALL: {
- if (b != 0) {
- checkreg(pt, a+b-1);
- }
- c--; /* c = num. returns */
- if (c == LUA_MULTRET) {
- check(checkopenop(pt, pc));
- }
- else if (c != 0)
- checkreg(pt, a+c-1);
- if (reg >= a) last = pc; /* affect all registers above base */
- break;
- }
- case OP_RETURN: {
- b--; /* b = num. returns */
- if (b > 0) checkreg(pt, a+b-1);
- break;
- }
- case OP_SETLIST: {
- checkreg(pt, a + (b&(LFIELDS_PER_FLUSH-1)) + 1);
- break;
- }
- case OP_CLOSURE: {
- int nup;
- check(b < pt->sizep);
- nup = pt->p[b]->nups;
- check(pc + nup < pt->sizecode);
- for (; nup>0; nup--) {
- OpCode op1 = GET_OPCODE(pt->code[pc+nup]);
- check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
- }
- break;
- }
- default: break;
- }
- }
- return pt->code[last];
-}
-
-#undef check
-#undef checkjump
-#undef checkreg
-
-/* }====================================================== */
-
-
-int luaG_checkcode (const Proto *pt) {
- return luaG_symbexec(pt, pt->sizecode, NO_REG);
-}
-
-
-static const char *kname (Proto *p, int c) {
- c = c - MAXSTACK;
- if (c >= 0 && ttisstring(&p->k[c]))
- return svalue(&p->k[c]);
- else
- return "?";
-}
-
-
-static const char *getobjname (CallInfo *ci, int stackpos, const char **name) {
- if (isLua(ci)) { /* a Lua function? */
- Proto *p = ci_func(ci)->l.p;
- int pc = currentpc(ci);
- Instruction i;
- *name = luaF_getlocalname(p, stackpos+1, pc);
- if (*name) /* is a local? */
- return "local";
- i = luaG_symbexec(p, pc, stackpos); /* try symbolic execution */
- lua_assert(pc != -1);
- switch (GET_OPCODE(i)) {
- case OP_GETGLOBAL: {
- int g = GETARG_Bx(i); /* global index */
- lua_assert(ttisstring(&p->k[g]));
- *name = svalue(&p->k[g]);
- return "global";
- }
- case OP_MOVE: {
- int a = GETARG_A(i);
- int b = GETARG_B(i); /* move from `b' to `a' */
- if (b < a)
- return getobjname(ci, b, name); /* get name for `b' */
- break;
- }
- case OP_GETTABLE: {
- int k = GETARG_C(i); /* key index */
- *name = kname(p, k);
- return "field";
- }
- case OP_SELF: {
- int k = GETARG_C(i); /* key index */
- *name = kname(p, k);
- return "method";
- }
- default: break;
- }
- }
- return NULL; /* no useful name found */
-}
-
-
-static const char *getfuncname (CallInfo *ci, const char **name) {
- Instruction i;
- if ((isLua(ci) && ci->u.l.tailcalls > 0) || !isLua(ci - 1))
- return NULL; /* calling function is not Lua (or is unknown) */
- ci--; /* calling function */
- i = ci_func(ci)->l.p->code[currentpc(ci)];
- if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL)
- return getobjname(ci, GETARG_A(i), name);
- else
- return NULL; /* no useful name can be found */
-}
-
-
-/* only ANSI way to check whether a pointer points to an array */
-static int isinstack (CallInfo *ci, const TObject *o) {
- StkId p;
- for (p = ci->base; p < ci->top; p++)
- if (o == p) return 1;
- return 0;
-}
-
-
-void luaG_typeerror (lua_State *L, const TObject *o, const char *op) {
- const char *name = NULL;
- const char *t = luaT_typenames[ttype(o)];
- const char *kind = (isinstack(L->ci, o)) ?
- getobjname(L->ci, o - L->base, &name) : NULL;
- if (kind)
- luaG_runerror(L, "attempt to %s %s `%s' (a %s value)",
- op, kind, name, t);
- else
- luaG_runerror(L, "attempt to %s a %s value", op, t);
-}
-
-
-void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
- if (ttisstring(p1)) p1 = p2;
- lua_assert(!ttisstring(p1));
- luaG_typeerror(L, p1, "concatenate");
-}
-
-
-void luaG_aritherror (lua_State *L, const TObject *p1, const TObject *p2) {
- TObject temp;
- if (luaV_tonumber(p1, &temp) == NULL)
- p2 = p1; /* first operand is wrong */
- luaG_typeerror(L, p2, "perform arithmetic on");
-}
-
-
-int luaG_ordererror (lua_State *L, const TObject *p1, const TObject *p2) {
- const char *t1 = luaT_typenames[ttype(p1)];
- const char *t2 = luaT_typenames[ttype(p2)];
- if (t1[2] == t2[2])
- luaG_runerror(L, "attempt to compare two %s values", t1);
- else
- luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
- return 0;
-}
-
-
-static void addinfo (lua_State *L, const char *msg) {
- CallInfo *ci = L->ci;
- if (isLua(ci)) { /* is Lua code? */
- char buff[LUA_IDSIZE]; /* add file:line information */
- int line = currentline(ci);
- luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE);
- luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
- }
-}
-
-
-void luaG_errormsg (lua_State *L) {
- if (L->errfunc != 0) { /* is there an error handling function? */
- StkId errfunc = restorestack(L, L->errfunc);
- if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
- setobjs2s(L->top, L->top - 1); /* move argument */
- setobjs2s(L->top - 1, errfunc); /* push function */
- incr_top(L);
- luaD_call(L, L->top - 2, 1); /* call it */
- }
- luaD_throw(L, LUA_ERRRUN);
-}
-
-
-void luaG_runerror (lua_State *L, const char *fmt, ...) {
- va_list argp;
- va_start(argp, fmt);
- addinfo(L, luaO_pushvfstring(L, fmt, argp));
- va_end(argp);
- luaG_errormsg(L);
-}
-
+++ /dev/null
-/*
-** $Id: ldebug.h,v 1.32 2002/11/18 11:01:55 roberto Exp $
-** Auxiliary functions from Debug Interface module
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ldebug_h
-#define ldebug_h
-
-
-#include "lstate.h"
-
-
-#define pcRel(pc, p) (cast(int, (pc) - (p)->code) - 1)
-
-#define getline(f,pc) (((f)->lineinfo) ? (f)->lineinfo[pc] : 0)
-
-#define resethookcount(L) (L->hookcount = L->basehookcount)
-
-
-void luaG_inithooks (lua_State *L);
-void luaG_typeerror (lua_State *L, const TObject *o, const char *opname);
-void luaG_concaterror (lua_State *L, StkId p1, StkId p2);
-void luaG_aritherror (lua_State *L, const TObject *p1, const TObject *p2);
-int luaG_ordererror (lua_State *L, const TObject *p1, const TObject *p2);
-void luaG_runerror (lua_State *L, const char *fmt, ...);
-void luaG_errormsg (lua_State *L);
-int luaG_checkcode (const Proto *pt);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: ldo.c,v 1.217a 2003/04/03 13:35:34 roberto Exp $
-** Stack and Call structure of Lua
-** See Copyright Notice in lua.h
-*/
-
-
-#include <setjmp.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define ldo_c
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lparser.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lundump.h"
-#include "lvm.h"
-#include "lzio.h"
-
-
-
-
-/*
-** {======================================================
-** Error-recovery functions (based on long jumps)
-** =======================================================
-*/
-
-
-/* chain list of long jump buffers */
-struct lua_longjmp {
- struct lua_longjmp *previous;
- jmp_buf b;
- volatile int status; /* error code */
-};
-
-
-static void seterrorobj (lua_State *L, int errcode, StkId oldtop) {
- switch (errcode) {
- case LUA_ERRMEM: {
- setsvalue2s(oldtop, luaS_new(L, MEMERRMSG));
- break;
- }
- case LUA_ERRERR: {
- setsvalue2s(oldtop, luaS_new(L, "error in error handling"));
- break;
- }
- case LUA_ERRSYNTAX:
- case LUA_ERRRUN: {
- setobjs2s(oldtop, L->top - 1); /* error message on current top */
- break;
- }
- }
- L->top = oldtop + 1;
-}
-
-
-void luaD_throw (lua_State *L, int errcode) {
- if (L->errorJmp) {
- L->errorJmp->status = errcode;
- longjmp(L->errorJmp->b, 1);
- }
- else {
- G(L)->panic(L);
- exit(EXIT_FAILURE);
- }
-}
-
-
-int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) {
- struct lua_longjmp lj;
- lj.status = 0;
- lj.previous = L->errorJmp; /* chain new error handler */
- L->errorJmp = &lj;
- if (setjmp(lj.b) == 0)
- (*f)(L, ud);
- L->errorJmp = lj.previous; /* restore old error handler */
- return lj.status;
-}
-
-
-static void restore_stack_limit (lua_State *L) {
- L->stack_last = L->stack+L->stacksize-1;
- if (L->size_ci > LUA_MAXCALLS) { /* there was an overflow? */
- int inuse = (L->ci - L->base_ci);
- if (inuse + 1 < LUA_MAXCALLS) /* can `undo' overflow? */
- luaD_reallocCI(L, LUA_MAXCALLS);
- }
-}
-
-/* }====================================================== */
-
-
-static void correctstack (lua_State *L, TObject *oldstack) {
- CallInfo *ci;
- GCObject *up;
- L->top = (L->top - oldstack) + L->stack;
- for (up = L->openupval; up != NULL; up = up->gch.next)
- gcotouv(up)->v = (gcotouv(up)->v - oldstack) + L->stack;
- for (ci = L->base_ci; ci <= L->ci; ci++) {
- ci->top = (ci->top - oldstack) + L->stack;
- ci->base = (ci->base - oldstack) + L->stack;
- }
- L->base = L->ci->base;
-}
-
-
-void luaD_reallocstack (lua_State *L, int newsize) {
- TObject *oldstack = L->stack;
- luaM_reallocvector(L, L->stack, L->stacksize, newsize, TObject);
- L->stacksize = newsize;
- L->stack_last = L->stack+newsize-1-EXTRA_STACK;
- correctstack(L, oldstack);
-}
-
-
-void luaD_reallocCI (lua_State *L, int newsize) {
- CallInfo *oldci = L->base_ci;
- luaM_reallocvector(L, L->base_ci, L->size_ci, newsize, CallInfo);
- L->size_ci = cast(unsigned short, newsize);
- L->ci = (L->ci - oldci) + L->base_ci;
- L->end_ci = L->base_ci + L->size_ci;
-}
-
-
-void luaD_growstack (lua_State *L, int n) {
- if (n <= L->stacksize) /* double size is enough? */
- luaD_reallocstack(L, 2*L->stacksize);
- else
- luaD_reallocstack(L, L->stacksize + n + EXTRA_STACK);
-}
-
-
-static void luaD_growCI (lua_State *L) {
- if (L->size_ci > LUA_MAXCALLS) /* overflow while handling overflow? */
- luaD_throw(L, LUA_ERRERR);
- else {
- luaD_reallocCI(L, 2*L->size_ci);
- if (L->size_ci > LUA_MAXCALLS)
- luaG_runerror(L, "stack overflow");
- }
-}
-
-
-void luaD_callhook (lua_State *L, int event, int line) {
- lua_Hook hook = L->hook;
- if (hook && L->allowhook) {
- ptrdiff_t top = savestack(L, L->top);
- ptrdiff_t ci_top = savestack(L, L->ci->top);
- lua_Debug ar;
- ar.event = event;
- ar.currentline = line;
- if (event == LUA_HOOKTAILRET)
- ar.i_ci = 0; /* tail call; no debug information about it */
- else
- ar.i_ci = L->ci - L->base_ci;
- luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */
- L->ci->top = L->top + LUA_MINSTACK;
- L->allowhook = 0; /* cannot call hooks inside a hook */
- lua_unlock(L);
- (*hook)(L, &ar);
- lua_lock(L);
- lua_assert(!L->allowhook);
- L->allowhook = 1;
- L->ci->top = restorestack(L, ci_top);
- L->top = restorestack(L, top);
- }
-}
-
-
-static void adjust_varargs (lua_State *L, int nfixargs, StkId base) {
- int i;
- Table *htab;
- TObject nname;
- int actual = L->top - base; /* actual number of arguments */
- if (actual < nfixargs) {
- luaD_checkstack(L, nfixargs - actual);
- for (; actual < nfixargs; ++actual)
- setnilvalue(L->top++);
- }
- actual -= nfixargs; /* number of extra arguments */
- htab = luaH_new(L, actual, 1); /* create `arg' table */
- for (i=0; i<actual; i++) /* put extra arguments into `arg' table */
- setobj2n(luaH_setnum(L, htab, i+1), L->top - actual + i);
- /* store counter in field `n' */
- setsvalue(&nname, luaS_newliteral(L, "n"));
- setnvalue(luaH_set(L, htab, &nname), cast(lua_Number, actual));
- L->top -= actual; /* remove extra elements from the stack */
- sethvalue(L->top, htab);
- incr_top(L);
-}
-
-
-static StkId tryfuncTM (lua_State *L, StkId func) {
- const TObject *tm = luaT_gettmbyobj(L, func, TM_CALL);
- StkId p;
- ptrdiff_t funcr = savestack(L, func);
- if (!ttisfunction(tm))
- luaG_typeerror(L, func, "call");
- /* Open a hole inside the stack at `func' */
- for (p = L->top; p > func; p--) setobjs2s(p, p-1);
- incr_top(L);
- func = restorestack(L, funcr); /* previous call may change stack */
- setobj2s(func, tm); /* tag method is the new function to be called */
- return func;
-}
-
-
-StkId luaD_precall (lua_State *L, StkId func) {
- LClosure *cl;
- ptrdiff_t funcr = savestack(L, func);
- if (!ttisfunction(func)) /* `func' is not a function? */
- func = tryfuncTM(L, func); /* check the `function' tag method */
- if (L->ci + 1 == L->end_ci) luaD_growCI(L);
- else condhardstacktests(luaD_reallocCI(L, L->size_ci));
- cl = &clvalue(func)->l;
- if (!cl->isC) { /* Lua function? prepare its call */
- CallInfo *ci;
- Proto *p = cl->p;
- if (p->is_vararg) /* varargs? */
- adjust_varargs(L, p->numparams, func+1);
- luaD_checkstack(L, p->maxstacksize);
- ci = ++L->ci; /* now `enter' new function */
- L->base = L->ci->base = restorestack(L, funcr) + 1;
- ci->top = L->base + p->maxstacksize;
- ci->u.l.savedpc = p->code; /* starting point */
- ci->u.l.tailcalls = 0;
- ci->state = CI_SAVEDPC;
- while (L->top < ci->top)
- setnilvalue(L->top++);
- L->top = ci->top;
- return NULL;
- }
- else { /* if is a C function, call it */
- CallInfo *ci;
- int n;
- luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */
- ci = ++L->ci; /* now `enter' new function */
- L->base = L->ci->base = restorestack(L, funcr) + 1;
- ci->top = L->top + LUA_MINSTACK;
- ci->state = CI_C; /* a C function */
- if (L->hookmask & LUA_MASKCALL)
- luaD_callhook(L, LUA_HOOKCALL, -1);
- lua_unlock(L);
-#ifdef LUA_COMPATUPVALUES
- lua_pushupvalues(L);
-#endif
- n = (*clvalue(L->base - 1)->c.f)(L); /* do the actual call */
- lua_lock(L);
- return L->top - n;
- }
-}
-
-
-static StkId callrethooks (lua_State *L, StkId firstResult) {
- ptrdiff_t fr = savestack(L, firstResult); /* next call may change stack */
- luaD_callhook(L, LUA_HOOKRET, -1);
- if (!(L->ci->state & CI_C)) { /* Lua function? */
- while (L->ci->u.l.tailcalls--) /* call hook for eventual tail calls */
- luaD_callhook(L, LUA_HOOKTAILRET, -1);
- }
- return restorestack(L, fr);
-}
-
-
-void luaD_poscall (lua_State *L, int wanted, StkId firstResult) {
- StkId res;
- if (L->hookmask & LUA_MASKRET)
- firstResult = callrethooks(L, firstResult);
- res = L->base - 1; /* res == final position of 1st result */
- L->ci--;
- L->base = L->ci->base; /* restore base */
- /* move results to correct place */
- while (wanted != 0 && firstResult < L->top) {
- setobjs2s(res++, firstResult++);
- wanted--;
- }
- while (wanted-- > 0)
- setnilvalue(res++);
- L->top = res;
-}
-
-
-/*
-** Call a function (C or Lua). The function to be called is at *func.
-** The arguments are on the stack, right after the function.
-** When returns, all the results are on the stack, starting at the original
-** function position.
-*/
-void luaD_call (lua_State *L, StkId func, int nResults) {
- StkId firstResult;
- lua_assert(!(L->ci->state & CI_CALLING));
- if (++L->nCcalls >= LUA_MAXCCALLS) {
- if (L->nCcalls == LUA_MAXCCALLS)
- luaG_runerror(L, "C stack overflow");
- else if (L->nCcalls >= (LUA_MAXCCALLS + (LUA_MAXCCALLS>>3)))
- luaD_throw(L, LUA_ERRERR); /* error while handing stack error */
- }
- firstResult = luaD_precall(L, func);
- if (firstResult == NULL) /* is a Lua function? */
- firstResult = luaV_execute(L); /* call it */
- luaD_poscall(L, nResults, firstResult);
- L->nCcalls--;
- luaC_checkGC(L);
-}
-
-
-static void resume (lua_State *L, void *ud) {
- StkId firstResult;
- int nargs = *cast(int *, ud);
- CallInfo *ci = L->ci;
- if (ci == L->base_ci) { /* no activation record? */
- lua_assert(nargs < L->top - L->base);
- luaD_precall(L, L->top - (nargs + 1)); /* start coroutine */
- }
- else { /* inside a yield */
- lua_assert(ci->state & CI_YIELD);
- if (ci->state & CI_C) { /* `common' yield? */
- /* finish interrupted execution of `OP_CALL' */
- int nresults;
- lua_assert((ci-1)->state & CI_SAVEDPC);
- lua_assert(GET_OPCODE(*((ci-1)->u.l.savedpc - 1)) == OP_CALL ||
- GET_OPCODE(*((ci-1)->u.l.savedpc - 1)) == OP_TAILCALL);
- nresults = GETARG_C(*((ci-1)->u.l.savedpc - 1)) - 1;
- luaD_poscall(L, nresults, L->top - nargs); /* complete it */
- if (nresults >= 0) L->top = L->ci->top;
- }
- else { /* yielded inside a hook: just continue its execution */
- ci->state &= ~CI_YIELD;
- }
- }
- firstResult = luaV_execute(L);
- if (firstResult != NULL) /* return? */
- luaD_poscall(L, LUA_MULTRET, firstResult); /* finalize this coroutine */
-}
-
-
-static int resume_error (lua_State *L, const char *msg) {
- L->top = L->ci->base;
- setsvalue2s(L->top, luaS_new(L, msg));
- incr_top(L);
- lua_unlock(L);
- return LUA_ERRRUN;
-}
-
-
-LUA_API int lua_resume (lua_State *L, int nargs) {
- int status;
- lu_byte old_allowhooks;
- lua_lock(L);
- if (L->ci == L->base_ci) {
- if (nargs >= L->top - L->base)
- return resume_error(L, "cannot resume dead coroutine");
- }
- else if (!(L->ci->state & CI_YIELD)) /* not inside a yield? */
- return resume_error(L, "cannot resume non-suspended coroutine");
- old_allowhooks = L->allowhook;
- lua_assert(L->errfunc == 0 && L->nCcalls == 0);
- status = luaD_rawrunprotected(L, resume, &nargs);
- if (status != 0) { /* error? */
- L->ci = L->base_ci; /* go back to initial level */
- L->base = L->ci->base;
- L->nCcalls = 0;
- luaF_close(L, L->base); /* close eventual pending closures */
- seterrorobj(L, status, L->base);
- L->allowhook = old_allowhooks;
- restore_stack_limit(L);
- }
- lua_unlock(L);
- return status;
-}
-
-
-LUA_API int lua_yield (lua_State *L, int nresults) {
- CallInfo *ci;
- lua_lock(L);
- ci = L->ci;
- if (L->nCcalls > 0)
- luaG_runerror(L, "attempt to yield across metamethod/C-call boundary");
- if (ci->state & CI_C) { /* usual yield */
- if ((ci-1)->state & CI_C)
- luaG_runerror(L, "cannot yield a C function");
- if (L->top - nresults > L->base) { /* is there garbage in the stack? */
- int i;
- for (i=0; i<nresults; i++) /* move down results */
- setobjs2s(L->base + i, L->top - nresults + i);
- L->top = L->base + nresults;
- }
- } /* else it's an yield inside a hook: nothing to do */
- ci->state |= CI_YIELD;
- lua_unlock(L);
- return -1;
-}
-
-
-int luaD_pcall (lua_State *L, Pfunc func, void *u,
- ptrdiff_t old_top, ptrdiff_t ef) {
- int status;
- unsigned short oldnCcalls = L->nCcalls;
- ptrdiff_t old_ci = saveci(L, L->ci);
- lu_byte old_allowhooks = L->allowhook;
- ptrdiff_t old_errfunc = L->errfunc;
- L->errfunc = ef;
- status = luaD_rawrunprotected(L, func, u);
- if (status != 0) { /* an error occurred? */
- StkId oldtop = restorestack(L, old_top);
- luaF_close(L, oldtop); /* close eventual pending closures */
- seterrorobj(L, status, oldtop);
- L->nCcalls = oldnCcalls;
- L->ci = restoreci(L, old_ci);
- L->base = L->ci->base;
- L->allowhook = old_allowhooks;
- restore_stack_limit(L);
- }
- L->errfunc = old_errfunc;
- return status;
-}
-
-
-
-/*
-** Execute a protected parser.
-*/
-struct SParser { /* data to `f_parser' */
- ZIO *z;
- Mbuffer buff; /* buffer to be used by the scanner */
- int bin;
-};
-
-static void f_parser (lua_State *L, void *ud) {
- struct SParser *p;
- Proto *tf;
- Closure *cl;
- luaC_checkGC(L);
- p = cast(struct SParser *, ud);
- tf = p->bin ? luaU_undump(L, p->z, &p->buff) : luaY_parser(L, p->z, &p->buff);
- cl = luaF_newLclosure(L, 0, gt(L));
- cl->l.p = tf;
- setclvalue(L->top, cl);
- incr_top(L);
-}
-
-
-int luaD_protectedparser (lua_State *L, ZIO *z, int bin) {
- struct SParser p;
- int status;
- ptrdiff_t oldtopr = savestack(L, L->top); /* save current top */
- p.z = z; p.bin = bin;
- luaZ_initbuffer(L, &p.buff);
- status = luaD_rawrunprotected(L, f_parser, &p);
- luaZ_freebuffer(L, &p.buff);
- if (status != 0) { /* error? */
- StkId oldtop = restorestack(L, oldtopr);
- seterrorobj(L, status, oldtop);
- }
- return status;
-}
-
-
+++ /dev/null
-/*
-** $Id: ldo.h,v 1.56 2002/12/04 17:29:32 roberto Exp $
-** Stack and Call structure of Lua
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ldo_h
-#define ldo_h
-
-
-#include "lobject.h"
-#include "lstate.h"
-#include "lzio.h"
-
-
-/*
-** macro to control inclusion of some hard tests on stack reallocation
-*/
-#ifndef HARDSTACKTESTS
-#define condhardstacktests(x) { /* empty */ }
-#else
-#define condhardstacktests(x) x
-#endif
-
-
-#define luaD_checkstack(L,n) \
- if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TObject)) \
- luaD_growstack(L, n); \
- else condhardstacktests(luaD_reallocstack(L, L->stacksize));
-
-
-#define incr_top(L) {luaD_checkstack(L,1); L->top++;}
-
-#define savestack(L,p) ((char *)(p) - (char *)L->stack)
-#define restorestack(L,n) ((TObject *)((char *)L->stack + (n)))
-
-#define saveci(L,p) ((char *)(p) - (char *)L->base_ci)
-#define restoreci(L,n) ((CallInfo *)((char *)L->base_ci + (n)))
-
-
-/* type of protected functions, to be ran by `runprotected' */
-typedef void (*Pfunc) (lua_State *L, void *ud);
-
-void luaD_resetprotection (lua_State *L);
-int luaD_protectedparser (lua_State *L, ZIO *z, int bin);
-void luaD_callhook (lua_State *L, int event, int line);
-StkId luaD_precall (lua_State *L, StkId func);
-void luaD_call (lua_State *L, StkId func, int nResults);
-int luaD_pcall (lua_State *L, Pfunc func, void *u,
- ptrdiff_t oldtop, ptrdiff_t ef);
-void luaD_poscall (lua_State *L, int wanted, StkId firstResult);
-void luaD_reallocCI (lua_State *L, int newsize);
-void luaD_reallocstack (lua_State *L, int newsize);
-void luaD_growstack (lua_State *L, int n);
-
-void luaD_throw (lua_State *L, int errcode);
-int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: ldump.c,v 1.4 2003/02/11 23:52:12 lhf Exp $
-** save bytecodes
-** See Copyright Notice in lua.h
-*/
-
-#include <stddef.h>
-
-#define ldump_c
-
-#include "lua.h"
-
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lstate.h"
-#include "lundump.h"
-
-#define DumpVector(b,n,size,D) DumpBlock(b,(n)*(size),D)
-#define DumpLiteral(s,D) DumpBlock("" s,(sizeof(s))-1,D)
-
-typedef struct {
- lua_State* L;
- lua_Chunkwriter write;
- void* data;
-} DumpState;
-
-static void DumpBlock(const void* b, size_t size, DumpState* D)
-{
- lua_unlock(D->L);
- (*D->write)(D->L,b,size,D->data);
- lua_lock(D->L);
-}
-
-static void DumpByte(int y, DumpState* D)
-{
- char x=(char)y;
- DumpBlock(&x,sizeof(x),D);
-}
-
-static void DumpInt(int x, DumpState* D)
-{
- DumpBlock(&x,sizeof(x),D);
-}
-
-static void DumpSize(size_t x, DumpState* D)
-{
- DumpBlock(&x,sizeof(x),D);
-}
-
-static void DumpNumber(lua_Number x, DumpState* D)
-{
- DumpBlock(&x,sizeof(x),D);
-}
-
-static void DumpString(TString* s, DumpState* D)
-{
- if (s==NULL || getstr(s)==NULL)
- DumpSize(0,D);
- else
- {
- size_t size=s->tsv.len+1; /* include trailing '\0' */
- DumpSize(size,D);
- DumpBlock(getstr(s),size,D);
- }
-}
-
-static void DumpCode(const Proto* f, DumpState* D)
-{
- DumpInt(f->sizecode,D);
- DumpVector(f->code,f->sizecode,sizeof(*f->code),D);
-}
-
-static void DumpLocals(const Proto* f, DumpState* D)
-{
- int i,n=f->sizelocvars;
- DumpInt(n,D);
- for (i=0; i<n; i++)
- {
- DumpString(f->locvars[i].varname,D);
- DumpInt(f->locvars[i].startpc,D);
- DumpInt(f->locvars[i].endpc,D);
- }
-}
-
-static void DumpLines(const Proto* f, DumpState* D)
-{
- DumpInt(f->sizelineinfo,D);
- DumpVector(f->lineinfo,f->sizelineinfo,sizeof(*f->lineinfo),D);
-}
-
-static void DumpUpvalues(const Proto* f, DumpState* D)
-{
- int i,n=f->sizeupvalues;
- DumpInt(n,D);
- for (i=0; i<n; i++) DumpString(f->upvalues[i],D);
-}
-
-static void DumpFunction(const Proto* f, const TString* p, DumpState* D);
-
-static void DumpConstants(const Proto* f, DumpState* D)
-{
- int i,n;
- DumpInt(n=f->sizek,D);
- for (i=0; i<n; i++)
- {
- const TObject* o=&f->k[i];
- DumpByte(ttype(o),D);
- switch (ttype(o))
- {
- case LUA_TNUMBER:
- DumpNumber(nvalue(o),D);
- break;
- case LUA_TSTRING:
- DumpString(tsvalue(o),D);
- break;
- case LUA_TNIL:
- break;
- default:
- lua_assert(0); /* cannot happen */
- break;
- }
- }
- DumpInt(n=f->sizep,D);
- for (i=0; i<n; i++) DumpFunction(f->p[i],f->source,D);
-}
-
-static void DumpFunction(const Proto* f, const TString* p, DumpState* D)
-{
- DumpString((f->source==p) ? NULL : f->source,D);
- DumpInt(f->lineDefined,D);
- DumpByte(f->nups,D);
- DumpByte(f->numparams,D);
- DumpByte(f->is_vararg,D);
- DumpByte(f->maxstacksize,D);
- DumpLines(f,D);
- DumpLocals(f,D);
- DumpUpvalues(f,D);
- DumpConstants(f,D);
- DumpCode(f,D);
-}
-
-static void DumpHeader(DumpState* D)
-{
- DumpLiteral(LUA_SIGNATURE,D);
- DumpByte(VERSION,D);
- DumpByte(luaU_endianness(),D);
- DumpByte(sizeof(int),D);
- DumpByte(sizeof(size_t),D);
- DumpByte(sizeof(Instruction),D);
- DumpByte(SIZE_OP,D);
- DumpByte(SIZE_A,D);
- DumpByte(SIZE_B,D);
- DumpByte(SIZE_C,D);
- DumpByte(sizeof(lua_Number),D);
- DumpNumber(TEST_NUMBER,D);
-}
-
-/*
-** dump function as precompiled chunk
-*/
-void luaU_dump (lua_State* L, const Proto* Main, lua_Chunkwriter w, void* data)
-{
- DumpState D;
- D.L=L;
- D.write=w;
- D.data=data;
- DumpHeader(&D);
- DumpFunction(Main,NULL,&D);
-}
-
+++ /dev/null
-/*
-** $Id: lfunc.c,v 1.67 2003/03/18 12:50:04 roberto Exp $
-** Auxiliary functions to manipulate prototypes and closures
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-
-#define lfunc_c
-
-#include "lua.h"
-
-#include "lfunc.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-
-
-#define sizeCclosure(n) (cast(int, sizeof(CClosure)) + \
- cast(int, sizeof(TObject)*((n)-1)))
-
-#define sizeLclosure(n) (cast(int, sizeof(LClosure)) + \
- cast(int, sizeof(TObject *)*((n)-1)))
-
-
-
-Closure *luaF_newCclosure (lua_State *L, int nelems) {
- Closure *c = cast(Closure *, luaM_malloc(L, sizeCclosure(nelems)));
- luaC_link(L, valtogco(c), LUA_TFUNCTION);
- c->c.isC = 1;
- c->c.nupvalues = cast(lu_byte, nelems);
- return c;
-}
-
-
-Closure *luaF_newLclosure (lua_State *L, int nelems, TObject *e) {
- Closure *c = cast(Closure *, luaM_malloc(L, sizeLclosure(nelems)));
- luaC_link(L, valtogco(c), LUA_TFUNCTION);
- c->l.isC = 0;
- c->l.g = *e;
- c->l.nupvalues = cast(lu_byte, nelems);
- return c;
-}
-
-
-UpVal *luaF_findupval (lua_State *L, StkId level) {
- GCObject **pp = &L->openupval;
- UpVal *p;
- UpVal *v;
- while ((p = ngcotouv(*pp)) != NULL && p->v >= level) {
- if (p->v == level) return p;
- pp = &p->next;
- }
- v = luaM_new(L, UpVal); /* not found: create a new one */
- v->tt = LUA_TUPVAL;
- v->marked = 1; /* open upvalues should not be collected */
- v->v = level; /* current value lives in the stack */
- v->next = *pp; /* chain it in the proper position */
- *pp = valtogco(v);
- return v;
-}
-
-
-void luaF_close (lua_State *L, StkId level) {
- UpVal *p;
- while ((p = ngcotouv(L->openupval)) != NULL && p->v >= level) {
- setobj(&p->value, p->v); /* save current value (write barrier) */
- p->v = &p->value; /* now current value lives here */
- L->openupval = p->next; /* remove from `open' list */
- luaC_link(L, valtogco(p), LUA_TUPVAL);
- }
-}
-
-
-Proto *luaF_newproto (lua_State *L) {
- Proto *f = luaM_new(L, Proto);
- luaC_link(L, valtogco(f), LUA_TPROTO);
- f->k = NULL;
- f->sizek = 0;
- f->p = NULL;
- f->sizep = 0;
- f->code = NULL;
- f->sizecode = 0;
- f->sizelineinfo = 0;
- f->sizeupvalues = 0;
- f->nups = 0;
- f->upvalues = NULL;
- f->numparams = 0;
- f->is_vararg = 0;
- f->maxstacksize = 0;
- f->lineinfo = NULL;
- f->sizelocvars = 0;
- f->locvars = NULL;
- f->lineDefined = 0;
- f->source = NULL;
- return f;
-}
-
-
-void luaF_freeproto (lua_State *L, Proto *f) {
- luaM_freearray(L, f->code, f->sizecode, Instruction);
- luaM_freearray(L, f->p, f->sizep, Proto *);
- luaM_freearray(L, f->k, f->sizek, TObject);
- luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
- luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
- luaM_freearray(L, f->upvalues, f->sizeupvalues, TString *);
- luaM_freelem(L, f);
-}
-
-
-void luaF_freeclosure (lua_State *L, Closure *c) {
- int size = (c->c.isC) ? sizeCclosure(c->c.nupvalues) :
- sizeLclosure(c->l.nupvalues);
- luaM_free(L, c, size);
-}
-
-
-/*
-** Look for n-th local variable at line `line' in function `func'.
-** Returns NULL if not found.
-*/
-const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {
- int i;
- for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) {
- if (pc < f->locvars[i].endpc) { /* is variable active? */
- local_number--;
- if (local_number == 0)
- return getstr(f->locvars[i].varname);
- }
- }
- return NULL; /* not found */
-}
-
+++ /dev/null
-/*
-** $Id: lfunc.h,v 1.21 2003/03/18 12:50:04 roberto Exp $
-** Auxiliary functions to manipulate prototypes and closures
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lfunc_h
-#define lfunc_h
-
-
-#include "lobject.h"
-
-
-Proto *luaF_newproto (lua_State *L);
-Closure *luaF_newCclosure (lua_State *L, int nelems);
-Closure *luaF_newLclosure (lua_State *L, int nelems, TObject *e);
-UpVal *luaF_findupval (lua_State *L, StkId level);
-void luaF_close (lua_State *L, StkId level);
-void luaF_freeproto (lua_State *L, Proto *f);
-void luaF_freeclosure (lua_State *L, Closure *c);
-
-const char *luaF_getlocalname (const Proto *func, int local_number, int pc);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lgc.c,v 1.171a 2003/04/03 13:35:34 roberto Exp $
-** Garbage Collector
-** See Copyright Notice in lua.h
-*/
-
-#include <string.h>
-
-#define lgc_c
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-
-
-typedef struct GCState {
- GCObject *tmark; /* list of marked objects to be traversed */
- GCObject *wk; /* list of traversed key-weak tables (to be cleared) */
- GCObject *wv; /* list of traversed value-weak tables */
- GCObject *wkv; /* list of traversed key-value weak tables */
- global_State *g;
-} GCState;
-
-
-/*
-** some userful bit tricks
-*/
-#define setbit(x,b) ((x) |= (1<<(b)))
-#define resetbit(x,b) ((x) &= cast(lu_byte, ~(1<<(b))))
-#define testbit(x,b) ((x) & (1<<(b)))
-
-#define unmark(x) resetbit((x)->gch.marked, 0)
-#define ismarked(x) ((x)->gch.marked & ((1<<4)|1))
-
-#define stringmark(s) setbit((s)->tsv.marked, 0)
-
-
-#define isfinalized(u) (!testbit((u)->uv.marked, 1))
-#define markfinalized(u) resetbit((u)->uv.marked, 1)
-
-
-#define KEYWEAKBIT 1
-#define VALUEWEAKBIT 2
-#define KEYWEAK (1<<KEYWEAKBIT)
-#define VALUEWEAK (1<<VALUEWEAKBIT)
-
-
-
-#define markobject(st,o) { checkconsistency(o); \
- if (iscollectable(o) && !ismarked(gcvalue(o))) reallymarkobject(st,gcvalue(o)); }
-
-#define condmarkobject(st,o,c) { checkconsistency(o); \
- if (iscollectable(o) && !ismarked(gcvalue(o)) && (c)) \
- reallymarkobject(st,gcvalue(o)); }
-
-#define markvalue(st,t) { if (!ismarked(valtogco(t))) \
- reallymarkobject(st, valtogco(t)); }
-
-
-
-static void reallymarkobject (GCState *st, GCObject *o) {
- lua_assert(!ismarked(o));
- setbit(o->gch.marked, 0); /* mark object */
- switch (o->gch.tt) {
- case LUA_TUSERDATA: {
- markvalue(st, gcotou(o)->uv.metatable);
- break;
- }
- case LUA_TFUNCTION: {
- gcotocl(o)->c.gclist = st->tmark;
- st->tmark = o;
- break;
- }
- case LUA_TTABLE: {
- gcotoh(o)->gclist = st->tmark;
- st->tmark = o;
- break;
- }
- case LUA_TTHREAD: {
- gcototh(o)->gclist = st->tmark;
- st->tmark = o;
- break;
- }
- case LUA_TPROTO: {
- gcotop(o)->gclist = st->tmark;
- st->tmark = o;
- break;
- }
- default: lua_assert(o->gch.tt == LUA_TSTRING);
- }
-}
-
-
-static void marktmu (GCState *st) {
- GCObject *u;
- for (u = st->g->tmudata; u; u = u->gch.next) {
- unmark(u); /* may be marked, if left from previous GC */
- reallymarkobject(st, u);
- }
-}
-
-
-/* move `dead' udata that need finalization to list `tmudata' */
-size_t luaC_separateudata (lua_State *L) {
- size_t deadmem = 0;
- GCObject **p = &G(L)->rootudata;
- GCObject *curr;
- GCObject *collected = NULL; /* to collect udata with gc event */
- GCObject **lastcollected = &collected;
- while ((curr = *p) != NULL) {
- lua_assert(curr->gch.tt == LUA_TUSERDATA);
- if (ismarked(curr) || isfinalized(gcotou(curr)))
- p = &curr->gch.next; /* don't bother with them */
-
- else if (fasttm(L, gcotou(curr)->uv.metatable, TM_GC) == NULL) {
- markfinalized(gcotou(curr)); /* don't need finalization */
- p = &curr->gch.next;
- }
- else { /* must call its gc method */
- deadmem += sizeudata(gcotou(curr)->uv.len);
- *p = curr->gch.next;
- curr->gch.next = NULL; /* link `curr' at the end of `collected' list */
- *lastcollected = curr;
- lastcollected = &curr->gch.next;
- }
- }
- /* insert collected udata with gc event into `tmudata' list */
- *lastcollected = G(L)->tmudata;
- G(L)->tmudata = collected;
- return deadmem;
-}
-
-
-static void removekey (Node *n) {
- setnilvalue(gval(n)); /* remove corresponding value ... */
- if (iscollectable(gkey(n)))
- setttype(gkey(n), LUA_TNONE); /* dead key; remove it */
-}
-
-
-static void traversetable (GCState *st, Table *h) {
- int i;
- int weakkey = 0;
- int weakvalue = 0;
- const TObject *mode;
- markvalue(st, h->metatable);
- lua_assert(h->lsizenode || h->node == st->g->dummynode);
- mode = gfasttm(st->g, h->metatable, TM_MODE);
- if (mode && ttisstring(mode)) { /* is there a weak mode? */
- weakkey = (strchr(svalue(mode), 'k') != NULL);
- weakvalue = (strchr(svalue(mode), 'v') != NULL);
- if (weakkey || weakvalue) { /* is really weak? */
- GCObject **weaklist;
- h->marked &= ~(KEYWEAK | VALUEWEAK); /* clear bits */
- h->marked |= cast(lu_byte, (weakkey << KEYWEAKBIT) |
- (weakvalue << VALUEWEAKBIT));
- weaklist = (weakkey && weakvalue) ? &st->wkv :
- (weakkey) ? &st->wk :
- &st->wv;
- h->gclist = *weaklist; /* must be cleared after GC, ... */
- *weaklist = valtogco(h); /* ... so put in the appropriate list */
- }
- }
- if (!weakvalue) {
- i = h->sizearray;
- while (i--)
- markobject(st, &h->array[i]);
- }
- i = sizenode(h);
- while (i--) {
- Node *n = gnode(h, i);
- if (!ttisnil(gval(n))) {
- lua_assert(!ttisnil(gkey(n)));
- condmarkobject(st, gkey(n), !weakkey);
- condmarkobject(st, gval(n), !weakvalue);
- }
- }
-}
-
-
-static void traverseproto (GCState *st, Proto *f) {
- int i;
- stringmark(f->source);
- for (i=0; i<f->sizek; i++) { /* mark literal strings */
- if (ttisstring(f->k+i))
- stringmark(tsvalue(f->k+i));
- }
- for (i=0; i<f->sizeupvalues; i++) /* mark upvalue names */
- stringmark(f->upvalues[i]);
- for (i=0; i<f->sizep; i++) /* mark nested protos */
- markvalue(st, f->p[i]);
- for (i=0; i<f->sizelocvars; i++) /* mark local-variable names */
- stringmark(f->locvars[i].varname);
- lua_assert(luaG_checkcode(f));
-}
-
-
-
-static void traverseclosure (GCState *st, Closure *cl) {
- if (cl->c.isC) {
- int i;
- for (i=0; i<cl->c.nupvalues; i++) /* mark its upvalues */
- markobject(st, &cl->c.upvalue[i]);
- }
- else {
- int i;
- lua_assert(cl->l.nupvalues == cl->l.p->nups);
- markvalue(st, hvalue(&cl->l.g));
- markvalue(st, cl->l.p);
- for (i=0; i<cl->l.nupvalues; i++) { /* mark its upvalues */
- UpVal *u = cl->l.upvals[i];
- if (!u->marked) {
- markobject(st, &u->value);
- u->marked = 1;
- }
- }
- }
-}
-
-
-static void checkstacksizes (lua_State *L, StkId max) {
- int used = L->ci - L->base_ci; /* number of `ci' in use */
- if (4*used < L->size_ci && 2*BASIC_CI_SIZE < L->size_ci)
- luaD_reallocCI(L, L->size_ci/2); /* still big enough... */
- else condhardstacktests(luaD_reallocCI(L, L->size_ci));
- used = max - L->stack; /* part of stack in use */
- if (4*used < L->stacksize && 2*(BASIC_STACK_SIZE+EXTRA_STACK) < L->stacksize)
- luaD_reallocstack(L, L->stacksize/2); /* still big enough... */
- else condhardstacktests(luaD_reallocstack(L, L->stacksize));
-}
-
-
-static void traversestack (GCState *st, lua_State *L1) {
- StkId o, lim;
- CallInfo *ci;
- markobject(st, gt(L1));
- lim = L1->top;
- for (ci = L1->base_ci; ci <= L1->ci; ci++) {
- lua_assert(ci->top <= L1->stack_last);
- lua_assert(ci->state & (CI_C | CI_HASFRAME | CI_SAVEDPC));
- if (lim < ci->top)
- lim = ci->top;
- }
- for (o = L1->stack; o < L1->top; o++)
- markobject(st, o);
- for (; o <= lim; o++)
- setnilvalue(o);
- checkstacksizes(L1, lim);
-}
-
-
-static void propagatemarks (GCState *st) {
- while (st->tmark) { /* traverse marked objects */
- switch (st->tmark->gch.tt) {
- case LUA_TTABLE: {
- Table *h = gcotoh(st->tmark);
- st->tmark = h->gclist;
- traversetable(st, h);
- break;
- }
- case LUA_TFUNCTION: {
- Closure *cl = gcotocl(st->tmark);
- st->tmark = cl->c.gclist;
- traverseclosure(st, cl);
- break;
- }
- case LUA_TTHREAD: {
- lua_State *th = gcototh(st->tmark);
- st->tmark = th->gclist;
- traversestack(st, th);
- break;
- }
- case LUA_TPROTO: {
- Proto *p = gcotop(st->tmark);
- st->tmark = p->gclist;
- traverseproto(st, p);
- break;
- }
- default: lua_assert(0);
- }
- }
-}
-
-
-static int valismarked (const TObject *o) {
- if (ttisstring(o))
- stringmark(tsvalue(o)); /* strings are `values', so are never weak */
- return !iscollectable(o) || testbit(o->value.gc->gch.marked, 0);
-}
-
-
-/*
-** clear collected keys from weaktables
-*/
-static void cleartablekeys (GCObject *l) {
- while (l) {
- Table *h = gcotoh(l);
- int i = sizenode(h);
- lua_assert(h->marked & KEYWEAK);
- while (i--) {
- Node *n = gnode(h, i);
- if (!valismarked(gkey(n))) /* key was collected? */
- removekey(n); /* remove entry from table */
- }
- l = h->gclist;
- }
-}
-
-
-/*
-** clear collected values from weaktables
-*/
-static void cleartablevalues (GCObject *l) {
- while (l) {
- Table *h = gcotoh(l);
- int i = h->sizearray;
- lua_assert(h->marked & VALUEWEAK);
- while (i--) {
- TObject *o = &h->array[i];
- if (!valismarked(o)) /* value was collected? */
- setnilvalue(o); /* remove value */
- }
- i = sizenode(h);
- while (i--) {
- Node *n = gnode(h, i);
- if (!valismarked(gval(n))) /* value was collected? */
- removekey(n); /* remove entry from table */
- }
- l = h->gclist;
- }
-}
-
-
-static void freeobj (lua_State *L, GCObject *o) {
- switch (o->gch.tt) {
- case LUA_TPROTO: luaF_freeproto(L, gcotop(o)); break;
- case LUA_TFUNCTION: luaF_freeclosure(L, gcotocl(o)); break;
- case LUA_TUPVAL: luaM_freelem(L, gcotouv(o)); break;
- case LUA_TTABLE: luaH_free(L, gcotoh(o)); break;
- case LUA_TTHREAD: {
- lua_assert(gcototh(o) != L && gcototh(o) != G(L)->mainthread);
- luaE_freethread(L, gcototh(o));
- break;
- }
- case LUA_TSTRING: {
- luaM_free(L, o, sizestring(gcotots(o)->tsv.len));
- break;
- }
- case LUA_TUSERDATA: {
- luaM_free(L, o, sizeudata(gcotou(o)->uv.len));
- break;
- }
- default: lua_assert(0);
- }
-}
-
-
-static int sweeplist (lua_State *L, GCObject **p, int limit) {
- GCObject *curr;
- int count = 0; /* number of collected items */
- while ((curr = *p) != NULL) {
- if (curr->gch.marked > limit) {
- unmark(curr);
- p = &curr->gch.next;
- }
- else {
- count++;
- *p = curr->gch.next;
- freeobj(L, curr);
- }
- }
- return count;
-}
-
-
-static void sweepstrings (lua_State *L, int all) {
- int i;
- for (i=0; i<G(L)->strt.size; i++) { /* for each list */
- G(L)->strt.nuse -= sweeplist(L, &G(L)->strt.hash[i], all);
- }
-}
-
-
-static void checkSizes (lua_State *L, size_t deadmem) {
- /* check size of string hash */
- if (G(L)->strt.nuse < cast(ls_nstr, G(L)->strt.size/4) &&
- G(L)->strt.size > MINSTRTABSIZE*2)
- luaS_resize(L, G(L)->strt.size/2); /* table is too big */
- /* check size of buffer */
- if (luaZ_sizebuffer(&G(L)->buff) > LUA_MINBUFFER*2) { /* buffer too big? */
- size_t newsize = luaZ_sizebuffer(&G(L)->buff) / 2;
- luaZ_resizebuffer(L, &G(L)->buff, newsize);
- }
- G(L)->GCthreshold = 2*G(L)->nblocks - deadmem; /* new threshold */
-}
-
-
-static void do1gcTM (lua_State *L, Udata *udata) {
- const TObject *tm = fasttm(L, udata->uv.metatable, TM_GC);
- if (tm != NULL) {
- setobj2s(L->top, tm);
- setuvalue(L->top+1, udata);
- L->top += 2;
- luaD_call(L, L->top - 2, 0);
- }
-}
-
-
-void luaC_callGCTM (lua_State *L) {
- lu_byte oldah = L->allowhook;
- L->allowhook = 0; /* stop debug hooks during GC tag methods */
- L->top++; /* reserve space to keep udata while runs its gc method */
- while (G(L)->tmudata != NULL) {
- GCObject *o = G(L)->tmudata;
- Udata *udata = gcotou(o);
- G(L)->tmudata = udata->uv.next; /* remove udata from `tmudata' */
- udata->uv.next = G(L)->rootudata; /* return it to `root' list */
- G(L)->rootudata = o;
- setuvalue(L->top - 1, udata); /* keep a reference to it */
- unmark(o);
- markfinalized(udata);
- do1gcTM(L, udata);
- }
- L->top--;
- L->allowhook = oldah; /* restore hooks */
-}
-
-
-void luaC_sweep (lua_State *L, int all) {
- if (all) all = 256; /* larger than any mark */
- sweeplist(L, &G(L)->rootudata, all);
- sweepstrings(L, all);
- sweeplist(L, &G(L)->rootgc, all);
-}
-
-
-/* mark root set */
-static void markroot (GCState *st, lua_State *L) {
- global_State *g = st->g;
- markobject(st, defaultmeta(L));
- markobject(st, registry(L));
- traversestack(st, g->mainthread);
- if (L != g->mainthread) /* another thread is running? */
- markvalue(st, L); /* cannot collect it */
-}
-
-
-static size_t mark (lua_State *L) {
- size_t deadmem;
- GCState st;
- GCObject *wkv;
- st.g = G(L);
- st.tmark = NULL;
- st.wkv = st.wk = st.wv = NULL;
- markroot(&st, L);
- propagatemarks(&st); /* mark all reachable objects */
- cleartablevalues(st.wkv);
- cleartablevalues(st.wv);
- wkv = st.wkv; /* keys must be cleared after preserving udata */
- st.wkv = NULL;
- st.wv = NULL;
- deadmem = luaC_separateudata(L); /* separate userdata to be preserved */
- marktmu(&st); /* mark `preserved' userdata */
- propagatemarks(&st); /* remark, to propagate `preserveness' */
- cleartablekeys(wkv);
- /* `propagatemarks' may resuscitate some weak tables; clear them too */
- cleartablekeys(st.wk);
- cleartablevalues(st.wv);
- cleartablekeys(st.wkv);
- cleartablevalues(st.wkv);
- return deadmem;
-}
-
-
-void luaC_collectgarbage (lua_State *L) {
- size_t deadmem = mark(L);
- luaC_sweep(L, 0);
- checkSizes(L, deadmem);
- luaC_callGCTM(L);
-}
-
-
-void luaC_link (lua_State *L, GCObject *o, lu_byte tt) {
- o->gch.next = G(L)->rootgc;
- G(L)->rootgc = o;
- o->gch.marked = 0;
- o->gch.tt = tt;
-}
-
+++ /dev/null
-/*
-** $Id: lgc.h,v 1.19a 2003/02/28 19:45:15 roberto Exp $
-** Garbage Collector
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lgc_h
-#define lgc_h
-
-
-#include "lobject.h"
-
-
-#define luaC_checkGC(L) { lua_assert(!(L->ci->state & CI_CALLING)); \
- if (G(L)->nblocks >= G(L)->GCthreshold) luaC_collectgarbage(L); }
-
-
-size_t luaC_separateudata (lua_State *L);
-void luaC_callGCTM (lua_State *L);
-void luaC_sweep (lua_State *L, int all);
-void luaC_collectgarbage (lua_State *L);
-void luaC_link (lua_State *L, GCObject *o, lu_byte tt);
-
-
-#endif
+++ /dev/null
-# makefile for Lua standard library
-
-LUA= ../..
-
-include $(LUA)/config
-
-EXTRA_DEFS= $(POPEN) $(TMPNAM) $(DEGREES) $(LOADLIB)
-
-OBJS= lauxlib.o lbaselib.o ldblib.o liolib.o lmathlib.o ltablib.o lstrlib.o loadlib.o
-SRCS= lauxlib.c lbaselib.c ldblib.c liolib.c lmathlib.c ltablib.c lstrlib.c loadlib.c
-
-T= $(LIB)/liblualib.a
-
-all: $T
-
-$T: $(OBJS)
- $(AR) $@ $(OBJS)
- $(RANLIB) $@
-
-clean:
- rm -f $(OBJS) $T
-
-co:
- co -q -f -M $(SRCS)
-
-klean: clean
- rm -f $(SRCS)
+++ /dev/null
-This is the standard Lua library.
-
-The code of the standard library can be read as an example of how to export
-C functions to Lua. The easiest library to read is lmathlib.c.
-
-The library is implemented entirely on top of the official Lua API as declared
-in lua.h, using lauxlib.c, which contains several useful functions for writing
-libraries. We encourage developers to use lauxlib.c in their own libraries.
+++ /dev/null
-/*
-** $Id: lauxlib.c,v 1.100 2003/04/07 14:35:00 roberto Exp $
-** Auxiliary functions for building Lua libraries
-** See Copyright Notice in lua.h
-*/
-
-
-#include <ctype.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <string.h>
-
-
-/* This file uses only the official API of Lua.
-** Any function declared here could be written as an application function.
-*/
-
-#define lauxlib_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-
-
-/* number of prereserved references (for internal use) */
-#define RESERVED_REFS 2
-
-/* reserved references */
-#define FREELIST_REF 1 /* free list of references */
-#define ARRAYSIZE_REF 2 /* array sizes */
-
-
-/* convert a stack index to positive */
-#define abs_index(L, i) ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
- lua_gettop(L) + (i) + 1)
-
-
-/*
-** {======================================================
-** Error-report functions
-** =======================================================
-*/
-
-
-LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
- lua_Debug ar;
- lua_getstack(L, 0, &ar);
- lua_getinfo(L, "n", &ar);
- if (strcmp(ar.namewhat, "method") == 0) {
- narg--; /* do not count `self' */
- if (narg == 0) /* error is in the self argument itself? */
- return luaL_error(L, "calling `%s' on bad self (%s)", ar.name, extramsg);
- }
- if (ar.name == NULL)
- ar.name = "?";
- return luaL_error(L, "bad argument #%d to `%s' (%s)",
- narg, ar.name, extramsg);
-}
-
-
-LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
- const char *msg = lua_pushfstring(L, "%s expected, got %s",
- tname, lua_typename(L, lua_type(L,narg)));
- return luaL_argerror(L, narg, msg);
-}
-
-
-static void tag_error (lua_State *L, int narg, int tag) {
- luaL_typerror(L, narg, lua_typename(L, tag));
-}
-
-
-LUALIB_API void luaL_where (lua_State *L, int level) {
- lua_Debug ar;
- if (lua_getstack(L, level, &ar)) { /* check function at level */
- lua_getinfo(L, "Snl", &ar); /* get info about it */
- if (ar.currentline > 0) { /* is there info? */
- lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
- return;
- }
- }
- lua_pushliteral(L, ""); /* else, no information available... */
-}
-
-
-LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
- va_list argp;
- va_start(argp, fmt);
- luaL_where(L, 1);
- lua_pushvfstring(L, fmt, argp);
- va_end(argp);
- lua_concat(L, 2);
- return lua_error(L);
-}
-
-/* }====================================================== */
-
-
-LUALIB_API int luaL_findstring (const char *name, const char *const list[]) {
- int i;
- for (i=0; list[i]; i++)
- if (strcmp(list[i], name) == 0)
- return i;
- return -1; /* name not found */
-}
-
-
-LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
- lua_pushstring(L, tname);
- lua_rawget(L, LUA_REGISTRYINDEX); /* get registry.name */
- if (!lua_isnil(L, -1)) /* name already in use? */
- return 0; /* leave previous value on top, but return 0 */
- lua_pop(L, 1);
- lua_newtable(L); /* create metatable */
- lua_pushstring(L, tname);
- lua_pushvalue(L, -2);
- lua_rawset(L, LUA_REGISTRYINDEX); /* registry.name = metatable */
- lua_pushvalue(L, -1);
- lua_pushstring(L, tname);
- lua_rawset(L, LUA_REGISTRYINDEX); /* registry[metatable] = name */
- return 1;
-}
-
-
-LUALIB_API void luaL_getmetatable (lua_State *L, const char *tname) {
- lua_pushstring(L, tname);
- lua_rawget(L, LUA_REGISTRYINDEX);
-}
-
-
-LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
- const char *tn;
- if (!lua_getmetatable(L, ud)) return NULL; /* no metatable? */
- lua_rawget(L, LUA_REGISTRYINDEX); /* get registry[metatable] */
- tn = lua_tostring(L, -1);
- if (tn && (strcmp(tn, tname) == 0)) {
- lua_pop(L, 1);
- return lua_touserdata(L, ud);
- }
- else {
- lua_pop(L, 1);
- return NULL;
- }
-}
-
-
-LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
- if (!lua_checkstack(L, space))
- luaL_error(L, "stack overflow (%s)", mes);
-}
-
-
-LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
- if (lua_type(L, narg) != t)
- tag_error(L, narg, t);
-}
-
-
-LUALIB_API void luaL_checkany (lua_State *L, int narg) {
- if (lua_type(L, narg) == LUA_TNONE)
- luaL_argerror(L, narg, "value expected");
-}
-
-
-LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
- const char *s = lua_tostring(L, narg);
- if (!s) tag_error(L, narg, LUA_TSTRING);
- if (len) *len = lua_strlen(L, narg);
- return s;
-}
-
-
-LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
- const char *def, size_t *len) {
- if (lua_isnoneornil(L, narg)) {
- if (len)
- *len = (def ? strlen(def) : 0);
- return def;
- }
- else return luaL_checklstring(L, narg, len);
-}
-
-
-LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
- lua_Number d = lua_tonumber(L, narg);
- if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
- tag_error(L, narg, LUA_TNUMBER);
- return d;
-}
-
-
-LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
- if (lua_isnoneornil(L, narg)) return def;
- else return luaL_checknumber(L, narg);
-}
-
-
-LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
- if (!lua_getmetatable(L, obj)) /* no metatable? */
- return 0;
- lua_pushstring(L, event);
- lua_rawget(L, -2);
- if (lua_isnil(L, -1)) {
- lua_pop(L, 2); /* remove metatable and metafield */
- return 0;
- }
- else {
- lua_remove(L, -2); /* remove only metatable */
- return 1;
- }
-}
-
-
-LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
- obj = abs_index(L, obj);
- if (!luaL_getmetafield(L, obj, event)) /* no metafield? */
- return 0;
- lua_pushvalue(L, obj);
- lua_call(L, 1, 1);
- return 1;
-}
-
-
-LUALIB_API void luaL_openlib (lua_State *L, const char *libname,
- const luaL_reg *l, int nup) {
- if (libname) {
- lua_pushstring(L, libname);
- lua_gettable(L, LUA_GLOBALSINDEX); /* check whether lib already exists */
- if (lua_isnil(L, -1)) { /* no? */
- lua_pop(L, 1);
- lua_newtable(L); /* create it */
- lua_pushstring(L, libname);
- lua_pushvalue(L, -2);
- lua_settable(L, LUA_GLOBALSINDEX); /* register it with given name */
- }
- lua_insert(L, -(nup+1)); /* move library table to below upvalues */
- }
- for (; l->name; l++) {
- int i;
- lua_pushstring(L, l->name);
- for (i=0; i<nup; i++) /* copy upvalues to the top */
- lua_pushvalue(L, -(nup+1));
- lua_pushcclosure(L, l->func, nup);
- lua_settable(L, -(nup+3));
- }
- lua_pop(L, nup); /* remove upvalues */
-}
-
-
-
-/*
-** {======================================================
-** getn-setn: size for arrays
-** =======================================================
-*/
-
-static int checkint (lua_State *L, int topop) {
- int n = (int)lua_tonumber(L, -1);
- if (n == 0 && !lua_isnumber(L, -1)) n = -1;
- lua_pop(L, topop);
- return n;
-}
-
-
-static void getsizes (lua_State *L) {
- lua_rawgeti(L, LUA_REGISTRYINDEX, ARRAYSIZE_REF);
- if (lua_isnil(L, -1)) { /* no `size' table? */
- lua_pop(L, 1); /* remove nil */
- lua_newtable(L); /* create it */
- lua_pushvalue(L, -1); /* `size' will be its own metatable */
- lua_setmetatable(L, -2);
- lua_pushliteral(L, "__mode");
- lua_pushliteral(L, "k");
- lua_rawset(L, -3); /* metatable(N).__mode = "k" */
- lua_pushvalue(L, -1);
- lua_rawseti(L, LUA_REGISTRYINDEX, ARRAYSIZE_REF); /* store in register */
- }
-}
-
-
-void luaL_setn (lua_State *L, int t, int n) {
- t = abs_index(L, t);
- lua_pushliteral(L, "n");
- lua_rawget(L, t);
- if (checkint(L, 1) >= 0) { /* is there a numeric field `n'? */
- lua_pushliteral(L, "n"); /* use it */
- lua_pushnumber(L, (lua_Number)n);
- lua_rawset(L, t);
- }
- else { /* use `sizes' */
- getsizes(L);
- lua_pushvalue(L, t);
- lua_pushnumber(L, (lua_Number)n);
- lua_rawset(L, -3); /* sizes[t] = n */
- lua_pop(L, 1); /* remove `sizes' */
- }
-}
-
-
-int luaL_getn (lua_State *L, int t) {
- int n;
- t = abs_index(L, t);
- lua_pushliteral(L, "n"); /* try t.n */
- lua_rawget(L, t);
- if ((n = checkint(L, 1)) >= 0) return n;
- getsizes(L); /* else try sizes[t] */
- lua_pushvalue(L, t);
- lua_rawget(L, -2);
- if ((n = checkint(L, 2)) >= 0) return n;
- for (n = 1; ; n++) { /* else must count elements */
- lua_rawgeti(L, t, n);
- if (lua_isnil(L, -1)) break;
- lua_pop(L, 1);
- }
- lua_pop(L, 1);
- return n - 1;
-}
-
-/* }====================================================== */
-
-
-
-/*
-** {======================================================
-** Generic Buffer manipulation
-** =======================================================
-*/
-
-
-#define bufflen(B) ((B)->p - (B)->buffer)
-#define bufffree(B) ((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
-
-#define LIMIT (LUA_MINSTACK/2)
-
-
-static int emptybuffer (luaL_Buffer *B) {
- size_t l = bufflen(B);
- if (l == 0) return 0; /* put nothing on stack */
- else {
- lua_pushlstring(B->L, B->buffer, l);
- B->p = B->buffer;
- B->lvl++;
- return 1;
- }
-}
-
-
-static void adjuststack (luaL_Buffer *B) {
- if (B->lvl > 1) {
- lua_State *L = B->L;
- int toget = 1; /* number of levels to concat */
- size_t toplen = lua_strlen(L, -1);
- do {
- size_t l = lua_strlen(L, -(toget+1));
- if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
- toplen += l;
- toget++;
- }
- else break;
- } while (toget < B->lvl);
- lua_concat(L, toget);
- B->lvl = B->lvl - toget + 1;
- }
-}
-
-
-LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
- if (emptybuffer(B))
- adjuststack(B);
- return B->buffer;
-}
-
-
-LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
- while (l--)
- luaL_putchar(B, *s++);
-}
-
-
-LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
- luaL_addlstring(B, s, strlen(s));
-}
-
-
-LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
- emptybuffer(B);
- lua_concat(B->L, B->lvl);
- B->lvl = 1;
-}
-
-
-LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
- lua_State *L = B->L;
- size_t vl = lua_strlen(L, -1);
- if (vl <= bufffree(B)) { /* fit into buffer? */
- memcpy(B->p, lua_tostring(L, -1), vl); /* put it there */
- B->p += vl;
- lua_pop(L, 1); /* remove from stack */
- }
- else {
- if (emptybuffer(B))
- lua_insert(L, -2); /* put buffer before new value */
- B->lvl++; /* add new value into B stack */
- adjuststack(B);
- }
-}
-
-
-LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
- B->L = L;
- B->p = B->buffer;
- B->lvl = 0;
-}
-
-/* }====================================================== */
-
-
-LUALIB_API int luaL_ref (lua_State *L, int t) {
- int ref;
- t = abs_index(L, t);
- if (lua_isnil(L, -1)) {
- lua_pop(L, 1); /* remove from stack */
- return LUA_REFNIL; /* `nil' has a unique fixed reference */
- }
- lua_rawgeti(L, t, FREELIST_REF); /* get first free element */
- ref = (int)lua_tonumber(L, -1); /* ref = t[FREELIST_REF] */
- lua_pop(L, 1); /* remove it from stack */
- if (ref != 0) { /* any free element? */
- lua_rawgeti(L, t, ref); /* remove it from list */
- lua_rawseti(L, t, FREELIST_REF); /* (t[FREELIST_REF] = t[ref]) */
- }
- else { /* no free elements */
- ref = luaL_getn(L, t);
- if (ref < RESERVED_REFS)
- ref = RESERVED_REFS; /* skip reserved references */
- ref++; /* create new reference */
- luaL_setn(L, t, ref);
- }
- lua_rawseti(L, t, ref);
- return ref;
-}
-
-
-LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
- if (ref >= 0) {
- t = abs_index(L, t);
- lua_rawgeti(L, t, FREELIST_REF);
- lua_rawseti(L, t, ref); /* t[ref] = t[FREELIST_REF] */
- lua_pushnumber(L, (lua_Number)ref);
- lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */
- }
-}
-
-
-
-/*
-** {======================================================
-** Load functions
-** =======================================================
-*/
-
-typedef struct LoadF {
- FILE *f;
- char buff[LUAL_BUFFERSIZE];
-} LoadF;
-
-
-static const char *getF (lua_State *L, void *ud, size_t *size) {
- LoadF *lf = (LoadF *)ud;
- (void)L;
- if (feof(lf->f)) return NULL;
- *size = fread(lf->buff, 1, LUAL_BUFFERSIZE, lf->f);
- return (*size > 0) ? lf->buff : NULL;
-}
-
-
-static int errfile (lua_State *L, int fnameindex) {
- const char *filename = lua_tostring(L, fnameindex) + 1;
- lua_pushfstring(L, "cannot read %s: %s", filename, strerror(errno));
- lua_remove(L, fnameindex);
- return LUA_ERRFILE;
-}
-
-
-LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
- LoadF lf;
- int status, readstatus;
- int c;
- int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
- if (filename == NULL) {
- lua_pushliteral(L, "=stdin");
- lf.f = stdin;
- }
- else {
- lua_pushfstring(L, "@%s", filename);
- lf.f = fopen(filename, "r");
- }
- if (lf.f == NULL) return errfile(L, fnameindex); /* unable to open file */
- c = ungetc(getc(lf.f), lf.f);
- if (!(isspace(c) || isprint(c)) && lf.f != stdin) { /* binary file? */
- fclose(lf.f);
- lf.f = fopen(filename, "rb"); /* reopen in binary mode */
- if (lf.f == NULL) return errfile(L, fnameindex); /* unable to reopen file */
- }
- status = lua_load(L, getF, &lf, lua_tostring(L, -1));
- readstatus = ferror(lf.f);
- if (lf.f != stdin) fclose(lf.f); /* close file (even in case of errors) */
- if (readstatus) {
- lua_settop(L, fnameindex); /* ignore results from `lua_load' */
- return errfile(L, fnameindex);
- }
- lua_remove(L, fnameindex);
- return status;
-}
-
-
-typedef struct LoadS {
- const char *s;
- size_t size;
-} LoadS;
-
-
-static const char *getS (lua_State *L, void *ud, size_t *size) {
- LoadS *ls = (LoadS *)ud;
- (void)L;
- if (ls->size == 0) return NULL;
- *size = ls->size;
- ls->size = 0;
- return ls->s;
-}
-
-
-LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
- const char *name) {
- LoadS ls;
- ls.s = buff;
- ls.size = size;
- return lua_load(L, getS, &ls, name);
-}
-
-/* }====================================================== */
-
-
-/*
-** {======================================================
-** compatibility code
-** =======================================================
-*/
-
-
-static void callalert (lua_State *L, int status) {
- if (status != 0) {
- lua_getglobal(L, "_ALERT");
- if (lua_isfunction(L, -1)) {
- lua_insert(L, -2);
- lua_call(L, 1, 0);
- }
- else { /* no _ALERT function; print it on stderr */
- fprintf(stderr, "%s\n", lua_tostring(L, -2));
- lua_pop(L, 2); /* remove error message and _ALERT */
- }
- }
-}
-
-
-static int aux_do (lua_State *L, int status) {
- if (status == 0) { /* parse OK? */
- status = lua_pcall(L, 0, LUA_MULTRET, 0); /* call main */
- }
- callalert(L, status);
- return status;
-}
-
-
-LUALIB_API int lua_dofile (lua_State *L, const char *filename) {
- return aux_do(L, luaL_loadfile(L, filename));
-}
-
-
-LUALIB_API int lua_dobuffer (lua_State *L, const char *buff, size_t size,
- const char *name) {
- return aux_do(L, luaL_loadbuffer(L, buff, size, name));
-}
-
-
-LUALIB_API int lua_dostring (lua_State *L, const char *str) {
- return lua_dobuffer(L, str, strlen(str), str);
-}
-
-/* }====================================================== */
+++ /dev/null
-/*
-** $Id: lbaselib.c,v 1.130b 2003/04/03 13:35:34 roberto Exp $
-** Basic library
-** See Copyright Notice in lua.h
-*/
-
-
-
-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lbaselib_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-
-
-/*
-** If your system does not support `stdout', you can just remove this function.
-** If you need, you can define your own `print' function, following this
-** model but changing `fputs' to put the strings at a proper place
-** (a console window or a log file, for instance).
-*/
-static int luaB_print (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- int i;
- lua_getglobal(L, "tostring");
- for (i=1; i<=n; i++) {
- const char *s;
- lua_pushvalue(L, -1); /* function to be called */
- lua_pushvalue(L, i); /* value to print */
- lua_call(L, 1, 1);
- s = lua_tostring(L, -1); /* get result */
- if (s == NULL)
- return luaL_error(L, "`tostring' must return a string to `print'");
- if (i>1) fputs("\t", stdout);
- fputs(s, stdout);
- lua_pop(L, 1); /* pop result */
- }
- fputs("\n", stdout);
- return 0;
-}
-
-
-static int luaB_tonumber (lua_State *L) {
- int base = luaL_optint(L, 2, 10);
- if (base == 10) { /* standard conversion */
- luaL_checkany(L, 1);
- if (lua_isnumber(L, 1)) {
- lua_pushnumber(L, lua_tonumber(L, 1));
- return 1;
- }
- }
- else {
- const char *s1 = luaL_checkstring(L, 1);
- char *s2;
- unsigned long n;
- luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
- n = strtoul(s1, &s2, base);
- if (s1 != s2) { /* at least one valid digit? */
- while (isspace((unsigned char)(*s2))) s2++; /* skip trailing spaces */
- if (*s2 == '\0') { /* no invalid trailing characters? */
- lua_pushnumber(L, (lua_Number)n);
- return 1;
- }
- }
- }
- lua_pushnil(L); /* else not a number */
- return 1;
-}
-
-
-static int luaB_error (lua_State *L) {
- int level = luaL_optint(L, 2, 1);
- luaL_checkany(L, 1);
- if (!lua_isstring(L, 1) || level == 0)
- lua_pushvalue(L, 1); /* propagate error message without changes */
- else { /* add extra information */
- luaL_where(L, level);
- lua_pushvalue(L, 1);
- lua_concat(L, 2);
- }
- return lua_error(L);
-}
-
-
-static int luaB_getmetatable (lua_State *L) {
- luaL_checkany(L, 1);
- if (!lua_getmetatable(L, 1)) {
- lua_pushnil(L);
- return 1; /* no metatable */
- }
- luaL_getmetafield(L, 1, "__metatable");
- return 1; /* returns either __metatable field (if present) or metatable */
-}
-
-
-static int luaB_setmetatable (lua_State *L) {
- int t = lua_type(L, 2);
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
- "nil or table expected");
- if (luaL_getmetafield(L, 1, "__metatable"))
- luaL_error(L, "cannot change a protected metatable");
- lua_settop(L, 2);
- lua_setmetatable(L, 1);
- return 1;
-}
-
-
-static void getfunc (lua_State *L) {
- if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
- else {
- lua_Debug ar;
- int level = luaL_optint(L, 1, 1);
- luaL_argcheck(L, level >= 0, 1, "level must be non-negative");
- if (lua_getstack(L, level, &ar) == 0)
- luaL_argerror(L, 1, "invalid level");
- lua_getinfo(L, "f", &ar);
- if (lua_isnil(L, -1))
- luaL_error(L, "no function environment for tail call at level %d",
- level);
- }
-}
-
-
-static int aux_getfenv (lua_State *L) {
- lua_getfenv(L, -1);
- lua_pushliteral(L, "__fenv");
- lua_rawget(L, -2);
- return !lua_isnil(L, -1);
-}
-
-
-static int luaB_getfenv (lua_State *L) {
- getfunc(L);
- if (!aux_getfenv(L)) /* __fenv not defined? */
- lua_pop(L, 1); /* remove it, to return real environment */
- return 1;
-}
-
-
-static int luaB_setfenv (lua_State *L) {
- luaL_checktype(L, 2, LUA_TTABLE);
- getfunc(L);
- if (aux_getfenv(L)) /* __fenv defined? */
- luaL_error(L, "`setfenv' cannot change a protected environment");
- else
- lua_pop(L, 2); /* remove __fenv and real environment table */
- lua_pushvalue(L, 2);
- if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0)
- lua_replace(L, LUA_GLOBALSINDEX);
- else if (lua_setfenv(L, -2) == 0)
- luaL_error(L, "`setfenv' cannot change environment of given function");
- return 0;
-}
-
-
-static int luaB_rawequal (lua_State *L) {
- luaL_checkany(L, 1);
- luaL_checkany(L, 2);
- lua_pushboolean(L, lua_rawequal(L, 1, 2));
- return 1;
-}
-
-
-static int luaB_rawget (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_checkany(L, 2);
- lua_rawget(L, 1);
- return 1;
-}
-
-static int luaB_rawset (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_checkany(L, 2);
- luaL_checkany(L, 3);
- lua_rawset(L, 1);
- return 1;
-}
-
-
-static int luaB_gcinfo (lua_State *L) {
- lua_pushnumber(L, (lua_Number)lua_getgccount(L));
- lua_pushnumber(L, (lua_Number)lua_getgcthreshold(L));
- return 2;
-}
-
-
-static int luaB_collectgarbage (lua_State *L) {
- lua_setgcthreshold(L, luaL_optint(L, 1, 0));
- return 0;
-}
-
-
-static int luaB_type (lua_State *L) {
- luaL_checkany(L, 1);
- lua_pushstring(L, lua_typename(L, lua_type(L, 1)));
- return 1;
-}
-
-
-static int luaB_next (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- lua_settop(L, 2); /* create a 2nd argument if there isn't one */
- if (lua_next(L, 1))
- return 2;
- else {
- lua_pushnil(L);
- return 1;
- }
-}
-
-
-static int luaB_pairs (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- lua_pushliteral(L, "next");
- lua_rawget(L, LUA_GLOBALSINDEX); /* return generator, */
- lua_pushvalue(L, 1); /* state, */
- lua_pushnil(L); /* and initial value */
- return 3;
-}
-
-
-static int luaB_ipairs (lua_State *L) {
- lua_Number i = lua_tonumber(L, 2);
- luaL_checktype(L, 1, LUA_TTABLE);
- if (i == 0 && lua_isnone(L, 2)) { /* `for' start? */
- lua_pushliteral(L, "ipairs");
- lua_rawget(L, LUA_GLOBALSINDEX); /* return generator, */
- lua_pushvalue(L, 1); /* state, */
- lua_pushnumber(L, 0); /* and initial value */
- return 3;
- }
- else { /* `for' step */
- i++; /* next value */
- lua_pushnumber(L, i);
- lua_rawgeti(L, 1, (int)i);
- return (lua_isnil(L, -1)) ? 0 : 2;
- }
-}
-
-
-static int load_aux (lua_State *L, int status) {
- if (status == 0) /* OK? */
- return 1;
- else {
- lua_pushnil(L);
- lua_insert(L, -2); /* put before error message */
- return 2; /* return nil plus error message */
- }
-}
-
-
-static int luaB_loadstring (lua_State *L) {
- size_t l;
- const char *s = luaL_checklstring(L, 1, &l);
- const char *chunkname = luaL_optstring(L, 2, s);
- return load_aux(L, luaL_loadbuffer(L, s, l, chunkname));
-}
-
-
-static int luaB_loadfile (lua_State *L) {
- const char *fname = luaL_optstring(L, 1, NULL);
- return load_aux(L, luaL_loadfile(L, fname));
-}
-
-
-static int luaB_dofile (lua_State *L) {
- const char *fname = luaL_optstring(L, 1, NULL);
- int n = lua_gettop(L);
- int status = luaL_loadfile(L, fname);
- if (status != 0) lua_error(L);
- lua_call(L, 0, LUA_MULTRET);
- return lua_gettop(L) - n;
-}
-
-
-static int luaB_assert (lua_State *L) {
- luaL_checkany(L, 1);
- if (!lua_toboolean(L, 1))
- return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
- lua_settop(L, 1);
- return 1;
-}
-
-
-static int luaB_unpack (lua_State *L) {
- int n, i;
- luaL_checktype(L, 1, LUA_TTABLE);
- n = luaL_getn(L, 1);
- luaL_checkstack(L, n, "table too big to unpack");
- for (i=1; i<=n; i++) /* push arg[1...n] */
- lua_rawgeti(L, 1, i);
- return n;
-}
-
-
-static int luaB_pcall (lua_State *L) {
- int status;
- luaL_checkany(L, 1);
- status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0);
- lua_pushboolean(L, (status == 0));
- lua_insert(L, 1);
- return lua_gettop(L); /* return status + all results */
-}
-
-
-static int luaB_xpcall (lua_State *L) {
- int status;
- luaL_checkany(L, 2);
- lua_settop(L, 2);
- lua_insert(L, 1); /* put error function under function to be called */
- status = lua_pcall(L, 0, LUA_MULTRET, 1);
- lua_pushboolean(L, (status == 0));
- lua_replace(L, 1);
- return lua_gettop(L); /* return status + all results */
-}
-
-
-static int luaB_tostring (lua_State *L) {
- char buff[128];
- luaL_checkany(L, 1);
- if (luaL_callmeta(L, 1, "__tostring")) /* is there a metafield? */
- return 1; /* use its value */
- switch (lua_type(L, 1)) {
- case LUA_TNUMBER:
- lua_pushstring(L, lua_tostring(L, 1));
- return 1;
- case LUA_TSTRING:
- lua_pushvalue(L, 1);
- return 1;
- case LUA_TBOOLEAN:
- lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
- return 1;
- case LUA_TTABLE:
- sprintf(buff, "table: %p", lua_topointer(L, 1));
- break;
- case LUA_TFUNCTION:
- sprintf(buff, "function: %p", lua_topointer(L, 1));
- break;
- case LUA_TUSERDATA:
- case LUA_TLIGHTUSERDATA:
- sprintf(buff, "userdata: %p", lua_touserdata(L, 1));
- break;
- case LUA_TTHREAD:
- sprintf(buff, "thread: %p", (void *)lua_tothread(L, 1));
- break;
- case LUA_TNIL:
- lua_pushliteral(L, "nil");
- return 1;
- }
- lua_pushstring(L, buff);
- return 1;
-}
-
-
-static int luaB_newproxy (lua_State *L) {
- lua_settop(L, 1);
- lua_newuserdata(L, 0); /* create proxy */
- if (lua_toboolean(L, 1) == 0)
- return 1; /* no metatable */
- else if (lua_isboolean(L, 1)) {
- lua_newtable(L); /* create a new metatable `m' ... */
- lua_pushvalue(L, -1); /* ... and mark `m' as a valid metatable */
- lua_pushboolean(L, 1);
- lua_rawset(L, lua_upvalueindex(1)); /* weaktable[m] = true */
- }
- else {
- int validproxy = 0; /* to check if weaktable[metatable(u)] == true */
- if (lua_getmetatable(L, 1)) {
- lua_rawget(L, lua_upvalueindex(1));
- validproxy = lua_toboolean(L, -1);
- lua_pop(L, 1); /* remove value */
- }
- luaL_argcheck(L, validproxy, 1, "boolean or proxy expected");
- lua_getmetatable(L, 1); /* metatable is valid; get it */
- }
- lua_setmetatable(L, 2);
- return 1;
-}
-
-
-/*
-** {======================================================
-** `require' function
-** =======================================================
-*/
-
-
-/* name of global that holds table with loaded packages */
-#define REQTAB "_LOADED"
-
-/* name of global that holds the search path for packages */
-#define LUA_PATH "LUA_PATH"
-
-#ifndef LUA_PATH_SEP
-#define LUA_PATH_SEP ';'
-#endif
-
-#ifndef LUA_PATH_MARK
-#define LUA_PATH_MARK '?'
-#endif
-
-#ifndef LUA_PATH_DEFAULT
-#define LUA_PATH_DEFAULT "?;?.lua"
-#endif
-
-
-static const char *getpath (lua_State *L) {
- const char *path;
- lua_getglobal(L, LUA_PATH); /* try global variable */
- path = lua_tostring(L, -1);
- lua_pop(L, 1);
- if (path) return path;
- path = getenv(LUA_PATH); /* else try environment variable */
- if (path) return path;
- return LUA_PATH_DEFAULT; /* else use default */
-}
-
-
-static const char *pushnextpath (lua_State *L, const char *path) {
- const char *l;
- if (*path == '\0') return NULL; /* no more paths */
- if (*path == LUA_PATH_SEP) path++; /* skip separator */
- l = strchr(path, LUA_PATH_SEP); /* find next separator */
- if (l == NULL) l = path+strlen(path);
- lua_pushlstring(L, path, l - path); /* directory name */
- return l;
-}
-
-
-static void pushcomposename (lua_State *L) {
- const char *path = lua_tostring(L, -1);
- const char *wild;
- int n = 1;
- while ((wild = strchr(path, LUA_PATH_MARK)) != NULL) {
- /* is there stack space for prefix, name, and eventual last sufix? */
- luaL_checkstack(L, 3, "too many marks in a path component");
- lua_pushlstring(L, path, wild - path); /* push prefix */
- lua_pushvalue(L, 1); /* push package name (in place of MARK) */
- path = wild + 1; /* continue after MARK */
- n += 2;
- }
- lua_pushstring(L, path); /* push last sufix (`n' already includes this) */
- lua_concat(L, n);
-}
-
-
-static int luaB_require (lua_State *L) {
- const char *path;
- int status = LUA_ERRFILE; /* not found (yet) */
- luaL_checkstring(L, 1);
- lua_settop(L, 1);
- lua_getglobal(L, REQTAB);
- if (!lua_istable(L, 2)) return luaL_error(L, "`" REQTAB "' is not a table");
- path = getpath(L);
- lua_pushvalue(L, 1); /* check package's name in book-keeping table */
- lua_rawget(L, 2);
- if (lua_toboolean(L, -1)) /* is it there? */
- return 1; /* package is already loaded; return its result */
- else { /* must load it */
- while (status == LUA_ERRFILE) {
- lua_settop(L, 3); /* reset stack position */
- if ((path = pushnextpath(L, path)) == NULL) break;
- pushcomposename(L);
- status = luaL_loadfile(L, lua_tostring(L, -1)); /* try to load it */
- }
- }
- switch (status) {
- case 0: {
- lua_getglobal(L, "_REQUIREDNAME"); /* save previous name */
- lua_insert(L, -2); /* put it below function */
- lua_pushvalue(L, 1);
- lua_setglobal(L, "_REQUIREDNAME"); /* set new name */
- lua_call(L, 0, 1); /* run loaded module */
- lua_insert(L, -2); /* put result below previous name */
- lua_setglobal(L, "_REQUIREDNAME"); /* reset to previous name */
- if (lua_isnil(L, -1)) { /* no/nil return? */
- lua_pushboolean(L, 1);
- lua_replace(L, -2); /* replace to true */
- }
- lua_pushvalue(L, 1);
- lua_pushvalue(L, -2);
- lua_rawset(L, 2); /* mark it as loaded */
- return 1; /* return value */
- }
- case LUA_ERRFILE: { /* file not found */
- return luaL_error(L, "could not load package `%s' from path `%s'",
- lua_tostring(L, 1), getpath(L));
- }
- default: {
- return luaL_error(L, "error loading package `%s' (%s)",
- lua_tostring(L, 1), lua_tostring(L, -1));
- }
- }
-}
-
-/* }====================================================== */
-
-
-static const luaL_reg base_funcs[] = {
- {"error", luaB_error},
- {"getmetatable", luaB_getmetatable},
- {"setmetatable", luaB_setmetatable},
- {"getfenv", luaB_getfenv},
- {"setfenv", luaB_setfenv},
- {"next", luaB_next},
- {"ipairs", luaB_ipairs},
- {"pairs", luaB_pairs},
- {"print", luaB_print},
- {"tonumber", luaB_tonumber},
- {"tostring", luaB_tostring},
- {"type", luaB_type},
- {"assert", luaB_assert},
- {"unpack", luaB_unpack},
- {"rawequal", luaB_rawequal},
- {"rawget", luaB_rawget},
- {"rawset", luaB_rawset},
- {"pcall", luaB_pcall},
- {"xpcall", luaB_xpcall},
- {"collectgarbage", luaB_collectgarbage},
- {"gcinfo", luaB_gcinfo},
- {"loadfile", luaB_loadfile},
- {"dofile", luaB_dofile},
- {"loadstring", luaB_loadstring},
- {"require", luaB_require},
- {NULL, NULL}
-};
-
-
-/*
-** {======================================================
-** Coroutine library
-** =======================================================
-*/
-
-static int auxresume (lua_State *L, lua_State *co, int narg) {
- int status;
- if (!lua_checkstack(co, narg))
- luaL_error(L, "too many arguments to resume");
- lua_xmove(L, co, narg);
- status = lua_resume(co, narg);
- if (status == 0) {
- int nres = lua_gettop(co);
- if (!lua_checkstack(L, nres))
- luaL_error(L, "too many results to resume");
- lua_xmove(co, L, nres); /* move yielded values */
- return nres;
- }
- else {
- lua_xmove(co, L, 1); /* move error message */
- return -1; /* error flag */
- }
-}
-
-
-static int luaB_coresume (lua_State *L) {
- lua_State *co = lua_tothread(L, 1);
- int r;
- luaL_argcheck(L, co, 1, "coroutine expected");
- r = auxresume(L, co, lua_gettop(L) - 1);
- if (r < 0) {
- lua_pushboolean(L, 0);
- lua_insert(L, -2);
- return 2; /* return false + error message */
- }
- else {
- lua_pushboolean(L, 1);
- lua_insert(L, -(r + 1));
- return r + 1; /* return true + `resume' returns */
- }
-}
-
-
-static int luaB_auxwrap (lua_State *L) {
- lua_State *co = lua_tothread(L, lua_upvalueindex(1));
- int r = auxresume(L, co, lua_gettop(L));
- if (r < 0) {
- if (lua_isstring(L, -1)) { /* error object is a string? */
- luaL_where(L, 1); /* add extra info */
- lua_insert(L, -2);
- lua_concat(L, 2);
- }
- lua_error(L); /* propagate error */
- }
- return r;
-}
-
-
-static int luaB_cocreate (lua_State *L) {
- lua_State *NL = lua_newthread(L);
- luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
- "Lua function expected");
- lua_pushvalue(L, 1); /* move function to top */
- lua_xmove(L, NL, 1); /* move function from L to NL */
- return 1;
-}
-
-
-static int luaB_cowrap (lua_State *L) {
- luaB_cocreate(L);
- lua_pushcclosure(L, luaB_auxwrap, 1);
- return 1;
-}
-
-
-static int luaB_yield (lua_State *L) {
- return lua_yield(L, lua_gettop(L));
-}
-
-
-static int luaB_costatus (lua_State *L) {
- lua_State *co = lua_tothread(L, 1);
- luaL_argcheck(L, co, 1, "coroutine expected");
- if (L == co) lua_pushliteral(L, "running");
- else {
- lua_Debug ar;
- if (lua_getstack(co, 0, &ar) == 0 && lua_gettop(co) == 0)
- lua_pushliteral(L, "dead");
- else
- lua_pushliteral(L, "suspended");
- }
- return 1;
-}
-
-
-static const luaL_reg co_funcs[] = {
- {"create", luaB_cocreate},
- {"wrap", luaB_cowrap},
- {"resume", luaB_coresume},
- {"yield", luaB_yield},
- {"status", luaB_costatus},
- {NULL, NULL}
-};
-
-/* }====================================================== */
-
-
-
-static void base_open (lua_State *L) {
- lua_pushliteral(L, "_G");
- lua_pushvalue(L, LUA_GLOBALSINDEX);
- luaL_openlib(L, NULL, base_funcs, 0); /* open lib into global table */
- lua_pushliteral(L, "_VERSION");
- lua_pushliteral(L, LUA_VERSION);
- lua_rawset(L, -3); /* set global _VERSION */
- /* `newproxy' needs a weaktable as upvalue */
- lua_pushliteral(L, "newproxy");
- lua_newtable(L); /* new table `w' */
- lua_pushvalue(L, -1); /* `w' will be its own metatable */
- lua_setmetatable(L, -2);
- lua_pushliteral(L, "__mode");
- lua_pushliteral(L, "k");
- lua_rawset(L, -3); /* metatable(w).__mode = "k" */
- lua_pushcclosure(L, luaB_newproxy, 1);
- lua_rawset(L, -3); /* set global `newproxy' */
- lua_rawset(L, -1); /* set global _G */
-}
-
-
-LUALIB_API int luaopen_base (lua_State *L) {
- base_open(L);
- luaL_openlib(L, LUA_COLIBNAME, co_funcs, 0);
- lua_newtable(L);
- lua_setglobal(L, REQTAB);
- return 0;
-}
-
+++ /dev/null
-/*
-** $Id: ldblib.c,v 1.80 2003/04/03 13:35:34 roberto Exp $
-** Interface from Lua to its debug API
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define ldblib_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-
-static void settabss (lua_State *L, const char *i, const char *v) {
- lua_pushstring(L, i);
- lua_pushstring(L, v);
- lua_rawset(L, -3);
-}
-
-
-static void settabsi (lua_State *L, const char *i, int v) {
- lua_pushstring(L, i);
- lua_pushnumber(L, (lua_Number)v);
- lua_rawset(L, -3);
-}
-
-
-static int getinfo (lua_State *L) {
- lua_Debug ar;
- const char *options = luaL_optstring(L, 2, "flnSu");
- if (lua_isnumber(L, 1)) {
- if (!lua_getstack(L, (int)(lua_tonumber(L, 1)), &ar)) {
- lua_pushnil(L); /* level out of range */
- return 1;
- }
- }
- else if (lua_isfunction(L, 1)) {
- lua_pushfstring(L, ">%s", options);
- options = lua_tostring(L, -1);
- lua_pushvalue(L, 1);
- }
- else
- return luaL_argerror(L, 1, "function or level expected");
- if (!lua_getinfo(L, options, &ar))
- return luaL_argerror(L, 2, "invalid option");
- lua_newtable(L);
- for (; *options; options++) {
- switch (*options) {
- case 'S':
- settabss(L, "source", ar.source);
- settabss(L, "short_src", ar.short_src);
- settabsi(L, "linedefined", ar.linedefined);
- settabss(L, "what", ar.what);
- break;
- case 'l':
- settabsi(L, "currentline", ar.currentline);
- break;
- case 'u':
- settabsi(L, "nups", ar.nups);
- break;
- case 'n':
- settabss(L, "name", ar.name);
- settabss(L, "namewhat", ar.namewhat);
- break;
- case 'f':
- lua_pushliteral(L, "func");
- lua_pushvalue(L, -3);
- lua_rawset(L, -3);
- break;
- }
- }
- return 1; /* return table */
-}
-
-
-static int getlocal (lua_State *L) {
- lua_Debug ar;
- const char *name;
- if (!lua_getstack(L, luaL_checkint(L, 1), &ar)) /* level out of range? */
- return luaL_argerror(L, 1, "level out of range");
- name = lua_getlocal(L, &ar, luaL_checkint(L, 2));
- if (name) {
- lua_pushstring(L, name);
- lua_pushvalue(L, -2);
- return 2;
- }
- else {
- lua_pushnil(L);
- return 1;
- }
-}
-
-
-static int setlocal (lua_State *L) {
- lua_Debug ar;
- if (!lua_getstack(L, luaL_checkint(L, 1), &ar)) /* level out of range? */
- return luaL_argerror(L, 1, "level out of range");
- luaL_checkany(L, 3);
- lua_pushstring(L, lua_setlocal(L, &ar, luaL_checkint(L, 2)));
- return 1;
-}
-
-
-static int auxupvalue (lua_State *L, int get) {
- const char *name;
- int n = luaL_checkint(L, 2);
- luaL_checktype(L, 1, LUA_TFUNCTION);
- if (lua_iscfunction(L, 1)) return 0; /* cannot touch C upvalues from Lua */
- name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
- if (name == NULL) return 0;
- lua_pushstring(L, name);
- lua_insert(L, -(get+1));
- return get + 1;
-}
-
-
-static int getupvalue (lua_State *L) {
- return auxupvalue(L, 1);
-}
-
-
-static int setupvalue (lua_State *L) {
- luaL_checkany(L, 3);
- return auxupvalue(L, 0);
-}
-
-
-
-static const char KEY_HOOK = 'h';
-
-
-static void hookf (lua_State *L, lua_Debug *ar) {
- static const char *const hooknames[] =
- {"call", "return", "line", "count", "tail return"};
- lua_pushlightuserdata(L, (void *)&KEY_HOOK);
- lua_rawget(L, LUA_REGISTRYINDEX);
- if (lua_isfunction(L, -1)) {
- lua_pushstring(L, hooknames[(int)ar->event]);
- if (ar->currentline >= 0)
- lua_pushnumber(L, (lua_Number)ar->currentline);
- else lua_pushnil(L);
- lua_assert(lua_getinfo(L, "lS", ar));
- lua_call(L, 2, 0);
- }
- else
- lua_pop(L, 1); /* pop result from gettable */
-}
-
-
-static int makemask (const char *smask, int count) {
- int mask = 0;
- if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
- if (strchr(smask, 'r')) mask |= LUA_MASKRET;
- if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
- if (count > 0) mask |= LUA_MASKCOUNT;
- return mask;
-}
-
-
-static char *unmakemask (int mask, char *smask) {
- int i = 0;
- if (mask & LUA_MASKCALL) smask[i++] = 'c';
- if (mask & LUA_MASKRET) smask[i++] = 'r';
- if (mask & LUA_MASKLINE) smask[i++] = 'l';
- smask[i] = '\0';
- return smask;
-}
-
-
-static int sethook (lua_State *L) {
- if (lua_isnoneornil(L, 1)) {
- lua_settop(L, 1);
- lua_sethook(L, NULL, 0, 0); /* turn off hooks */
- }
- else {
- const char *smask = luaL_checkstring(L, 2);
- int count = luaL_optint(L, 3, 0);
- luaL_checktype(L, 1, LUA_TFUNCTION);
- lua_sethook(L, hookf, makemask(smask, count), count);
- }
- lua_pushlightuserdata(L, (void *)&KEY_HOOK);
- lua_pushvalue(L, 1);
- lua_rawset(L, LUA_REGISTRYINDEX); /* set new hook */
- return 0;
-}
-
-
-static int gethook (lua_State *L) {
- char buff[5];
- int mask = lua_gethookmask(L);
- lua_Hook hook = lua_gethook(L);
- if (hook != NULL && hook != hookf) /* external hook? */
- lua_pushliteral(L, "external hook");
- else {
- lua_pushlightuserdata(L, (void *)&KEY_HOOK);
- lua_rawget(L, LUA_REGISTRYINDEX); /* get hook */
- }
- lua_pushstring(L, unmakemask(mask, buff));
- lua_pushnumber(L, (lua_Number)lua_gethookcount(L));
- return 3;
-}
-
-
-static int debug (lua_State *L) {
- for (;;) {
- char buffer[250];
- fputs("lua_debug> ", stderr);
- if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
- strcmp(buffer, "cont\n") == 0)
- return 0;
- lua_dostring(L, buffer);
- lua_settop(L, 0); /* remove eventual returns */
- }
-}
-
-
-#define LEVELS1 12 /* size of the first part of the stack */
-#define LEVELS2 10 /* size of the second part of the stack */
-
-static int errorfb (lua_State *L) {
- int level = 1; /* skip level 0 (it's this function) */
- int firstpart = 1; /* still before eventual `...' */
- lua_Debug ar;
- if (lua_gettop(L) == 0)
- lua_pushliteral(L, "");
- else if (!lua_isstring(L, 1)) return 1; /* no string message */
- else lua_pushliteral(L, "\n");
- lua_pushliteral(L, "stack traceback:");
- while (lua_getstack(L, level++, &ar)) {
- if (level > LEVELS1 && firstpart) {
- /* no more than `LEVELS2' more levels? */
- if (!lua_getstack(L, level+LEVELS2, &ar))
- level--; /* keep going */
- else {
- lua_pushliteral(L, "\n\t..."); /* too many levels */
- while (lua_getstack(L, level+LEVELS2, &ar)) /* find last levels */
- level++;
- }
- firstpart = 0;
- continue;
- }
- lua_pushliteral(L, "\n\t");
- lua_getinfo(L, "Snl", &ar);
- lua_pushfstring(L, "%s:", ar.short_src);
- if (ar.currentline > 0)
- lua_pushfstring(L, "%d:", ar.currentline);
- switch (*ar.namewhat) {
- case 'g': /* global */
- case 'l': /* local */
- case 'f': /* field */
- case 'm': /* method */
- lua_pushfstring(L, " in function `%s'", ar.name);
- break;
- default: {
- if (*ar.what == 'm') /* main? */
- lua_pushfstring(L, " in main chunk");
- else if (*ar.what == 'C' || *ar.what == 't')
- lua_pushliteral(L, " ?"); /* C function or tail call */
- else
- lua_pushfstring(L, " in function <%s:%d>",
- ar.short_src, ar.linedefined);
- }
- }
- lua_concat(L, lua_gettop(L));
- }
- lua_concat(L, lua_gettop(L));
- return 1;
-}
-
-
-static const luaL_reg dblib[] = {
- {"getlocal", getlocal},
- {"getinfo", getinfo},
- {"gethook", gethook},
- {"getupvalue", getupvalue},
- {"sethook", sethook},
- {"setlocal", setlocal},
- {"setupvalue", setupvalue},
- {"debug", debug},
- {"traceback", errorfb},
- {NULL, NULL}
-};
-
-
-LUALIB_API int luaopen_debug (lua_State *L) {
- luaL_openlib(L, LUA_DBLIBNAME, dblib, 0);
- lua_pushliteral(L, "_TRACEBACK");
- lua_pushcfunction(L, errorfb);
- lua_settable(L, LUA_GLOBALSINDEX);
- return 1;
-}
-
+++ /dev/null
-/*
-** $Id: liolib.c,v 2.39a 2003/03/19 21:16:12 roberto Exp $
-** Standard I/O (and system) library
-** See Copyright Notice in lua.h
-*/
-
-
-#include <errno.h>
-#include <locale.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#define liolib_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-
-/*
-** by default, gcc does not get `tmpname'
-*/
-#ifndef USE_TMPNAME
-#ifdef __GNUC__
-#define USE_TMPNAME 0
-#else
-#define USE_TMPNAME 1
-#endif
-#endif
-
-
-/*
-** by default, posix systems get `popen'
-*/
-#ifndef USE_POPEN
-#ifdef _POSIX_C_SOURCE
-#if _POSIX_C_SOURCE >= 2
-#define USE_POPEN 1
-#endif
-#endif
-#endif
-
-#ifndef USE_POPEN
-#define USE_POPEN 0
-#endif
-
-
-
-
-/*
-** {======================================================
-** FILE Operations
-** =======================================================
-*/
-
-
-#if !USE_POPEN
-#define pclose(f) (-1)
-#endif
-
-
-#define FILEHANDLE "FILE*"
-
-#define IO_INPUT "_input"
-#define IO_OUTPUT "_output"
-
-
-static int pushresult (lua_State *L, int i, const char *filename) {
- if (i) {
- lua_pushboolean(L, 1);
- return 1;
- }
- else {
- lua_pushnil(L);
- if (filename)
- lua_pushfstring(L, "%s: %s", filename, strerror(errno));
- else
- lua_pushfstring(L, "%s", strerror(errno));
- lua_pushnumber(L, errno);
- return 3;
- }
-}
-
-
-static FILE **topfile (lua_State *L, int findex) {
- FILE **f = (FILE **)luaL_checkudata(L, findex, FILEHANDLE);
- if (f == NULL) luaL_argerror(L, findex, "bad file");
- return f;
-}
-
-
-static int io_type (lua_State *L) {
- FILE **f = (FILE **)luaL_checkudata(L, 1, FILEHANDLE);
- if (f == NULL) lua_pushnil(L);
- else if (*f == NULL)
- lua_pushliteral(L, "closed file");
- else
- lua_pushliteral(L, "file");
- return 1;
-}
-
-
-static FILE *tofile (lua_State *L, int findex) {
- FILE **f = topfile(L, findex);
- if (*f == NULL)
- luaL_error(L, "attempt to use a closed file");
- return *f;
-}
-
-
-
-/*
-** When creating file handles, always creates a `closed' file handle
-** before opening the actual file; so, if there is a memory error, the
-** file is not left opened.
-*/
-static FILE **newfile (lua_State *L) {
- FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
- *pf = NULL; /* file handle is currently `closed' */
- luaL_getmetatable(L, FILEHANDLE);
- lua_setmetatable(L, -2);
- return pf;
-}
-
-
-/*
-** assumes that top of the stack is the `io' library, and next is
-** the `io' metatable
-*/
-static void registerfile (lua_State *L, FILE *f, const char *name,
- const char *impname) {
- lua_pushstring(L, name);
- *newfile(L) = f;
- if (impname) {
- lua_pushstring(L, impname);
- lua_pushvalue(L, -2);
- lua_settable(L, -6); /* metatable[impname] = file */
- }
- lua_settable(L, -3); /* io[name] = file */
-}
-
-
-static int aux_close (lua_State *L) {
- FILE *f = tofile(L, 1);
- if (f == stdin || f == stdout || f == stderr)
- return 0; /* file cannot be closed */
- else {
- int ok = (pclose(f) != -1) || (fclose(f) == 0);
- if (ok)
- *(FILE **)lua_touserdata(L, 1) = NULL; /* mark file as closed */
- return ok;
- }
-}
-
-
-static int io_close (lua_State *L) {
- if (lua_isnone(L, 1) && lua_type(L, lua_upvalueindex(1)) == LUA_TTABLE) {
- lua_pushstring(L, IO_OUTPUT);
- lua_rawget(L, lua_upvalueindex(1));
- }
- return pushresult(L, aux_close(L), NULL);
-}
-
-
-static int io_gc (lua_State *L) {
- FILE **f = topfile(L, 1);
- if (*f != NULL) /* ignore closed files */
- aux_close(L);
- return 0;
-}
-
-
-static int io_tostring (lua_State *L) {
- char buff[128];
- FILE **f = topfile(L, 1);
- if (*f == NULL)
- strcpy(buff, "closed");
- else
- sprintf(buff, "%p", lua_touserdata(L, 1));
- lua_pushfstring(L, "file (%s)", buff);
- return 1;
-}
-
-
-static int io_open (lua_State *L) {
- const char *filename = luaL_checkstring(L, 1);
- const char *mode = luaL_optstring(L, 2, "r");
- FILE **pf = newfile(L);
- *pf = fopen(filename, mode);
- return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
-}
-
-
-static int io_popen (lua_State *L) {
-#if !USE_POPEN
- luaL_error(L, "`popen' not supported");
- return 0;
-#else
- const char *filename = luaL_checkstring(L, 1);
- const char *mode = luaL_optstring(L, 2, "r");
- FILE **pf = newfile(L);
- *pf = popen(filename, mode);
- return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
-#endif
-}
-
-
-static int io_tmpfile (lua_State *L) {
- FILE **pf = newfile(L);
- *pf = tmpfile();
- return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;
-}
-
-
-static FILE *getiofile (lua_State *L, const char *name) {
- lua_pushstring(L, name);
- lua_rawget(L, lua_upvalueindex(1));
- return tofile(L, -1);
-}
-
-
-static int g_iofile (lua_State *L, const char *name, const char *mode) {
- if (!lua_isnoneornil(L, 1)) {
- const char *filename = lua_tostring(L, 1);
- lua_pushstring(L, name);
- if (filename) {
- FILE **pf = newfile(L);
- *pf = fopen(filename, mode);
- if (*pf == NULL) {
- lua_pushfstring(L, "%s: %s", filename, strerror(errno));
- luaL_argerror(L, 1, lua_tostring(L, -1));
- }
- }
- else {
- tofile(L, 1); /* check that it's a valid file handle */
- lua_pushvalue(L, 1);
- }
- lua_rawset(L, lua_upvalueindex(1));
- }
- /* return current value */
- lua_pushstring(L, name);
- lua_rawget(L, lua_upvalueindex(1));
- return 1;
-}
-
-
-static int io_input (lua_State *L) {
- return g_iofile(L, IO_INPUT, "r");
-}
-
-
-static int io_output (lua_State *L) {
- return g_iofile(L, IO_OUTPUT, "w");
-}
-
-
-static int io_readline (lua_State *L);
-
-
-static void aux_lines (lua_State *L, int idx, int close) {
- lua_pushliteral(L, FILEHANDLE);
- lua_rawget(L, LUA_REGISTRYINDEX);
- lua_pushvalue(L, idx);
- lua_pushboolean(L, close); /* close/not close file when finished */
- lua_pushcclosure(L, io_readline, 3);
-}
-
-
-static int f_lines (lua_State *L) {
- tofile(L, 1); /* check that it's a valid file handle */
- aux_lines(L, 1, 0);
- return 1;
-}
-
-
-static int io_lines (lua_State *L) {
- if (lua_isnoneornil(L, 1)) { /* no arguments? */
- lua_pushstring(L, IO_INPUT);
- lua_rawget(L, lua_upvalueindex(1)); /* will iterate over default input */
- return f_lines(L);
- }
- else {
- const char *filename = luaL_checkstring(L, 1);
- FILE **pf = newfile(L);
- *pf = fopen(filename, "r");
- luaL_argcheck(L, *pf, 1, strerror(errno));
- aux_lines(L, lua_gettop(L), 1);
- return 1;
- }
-}
-
-
-/*
-** {======================================================
-** READ
-** =======================================================
-*/
-
-
-static int read_number (lua_State *L, FILE *f) {
- lua_Number d;
- if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
- lua_pushnumber(L, d);
- return 1;
- }
- else return 0; /* read fails */
-}
-
-
-static int test_eof (lua_State *L, FILE *f) {
- int c = getc(f);
- ungetc(c, f);
- lua_pushlstring(L, NULL, 0);
- return (c != EOF);
-}
-
-
-static int read_line (lua_State *L, FILE *f) {
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- for (;;) {
- size_t l;
- char *p = luaL_prepbuffer(&b);
- if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
- luaL_pushresult(&b); /* close buffer */
- return (lua_strlen(L, -1) > 0); /* check whether read something */
- }
- l = strlen(p);
- if (p[l-1] != '\n')
- luaL_addsize(&b, l);
- else {
- luaL_addsize(&b, l - 1); /* do not include `eol' */
- luaL_pushresult(&b); /* close buffer */
- return 1; /* read at least an `eol' */
- }
- }
-}
-
-
-static int read_chars (lua_State *L, FILE *f, size_t n) {
- size_t rlen; /* how much to read */
- size_t nr; /* number of chars actually read */
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- rlen = LUAL_BUFFERSIZE; /* try to read that much each time */
- do {
- char *p = luaL_prepbuffer(&b);
- if (rlen > n) rlen = n; /* cannot read more than asked */
- nr = fread(p, sizeof(char), rlen, f);
- luaL_addsize(&b, nr);
- n -= nr; /* still have to read `n' chars */
- } while (n > 0 && nr == rlen); /* until end of count or eof */
- luaL_pushresult(&b); /* close buffer */
- return (n == 0 || lua_strlen(L, -1) > 0);
-}
-
-
-static int g_read (lua_State *L, FILE *f, int first) {
- int nargs = lua_gettop(L) - 1;
- int success;
- int n;
- if (nargs == 0) { /* no arguments? */
- success = read_line(L, f);
- n = first+1; /* to return 1 result */
- }
- else { /* ensure stack space for all results and for auxlib's buffer */
- luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
- success = 1;
- for (n = first; nargs-- && success; n++) {
- if (lua_type(L, n) == LUA_TNUMBER) {
- size_t l = (size_t)lua_tonumber(L, n);
- success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
- }
- else {
- const char *p = lua_tostring(L, n);
- luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
- switch (p[1]) {
- case 'n': /* number */
- success = read_number(L, f);
- break;
- case 'l': /* line */
- success = read_line(L, f);
- break;
- case 'a': /* file */
- read_chars(L, f, ~((size_t)0)); /* read MAX_SIZE_T chars */
- success = 1; /* always success */
- break;
- case 'w': /* word */
- return luaL_error(L, "obsolete option `*w' to `read'");
- default:
- return luaL_argerror(L, n, "invalid format");
- }
- }
- }
- }
- if (!success) {
- lua_pop(L, 1); /* remove last result */
- lua_pushnil(L); /* push nil instead */
- }
- return n - first;
-}
-
-
-static int io_read (lua_State *L) {
- return g_read(L, getiofile(L, IO_INPUT), 1);
-}
-
-
-static int f_read (lua_State *L) {
- return g_read(L, tofile(L, 1), 2);
-}
-
-
-static int io_readline (lua_State *L) {
- FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(2));
- if (f == NULL) /* file is already closed? */
- luaL_error(L, "file is already closed");
- if (read_line(L, f)) return 1;
- else { /* EOF */
- if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */
- lua_settop(L, 0);
- lua_pushvalue(L, lua_upvalueindex(2));
- aux_close(L); /* close it */
- }
- return 0;
- }
-}
-
-/* }====================================================== */
-
-
-static int g_write (lua_State *L, FILE *f, int arg) {
- int nargs = lua_gettop(L) - 1;
- int status = 1;
- for (; nargs--; arg++) {
- if (lua_type(L, arg) == LUA_TNUMBER) {
- /* optimization: could be done exactly as for strings */
- status = status &&
- fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
- }
- else {
- size_t l;
- const char *s = luaL_checklstring(L, arg, &l);
- status = status && (fwrite(s, sizeof(char), l, f) == l);
- }
- }
- return pushresult(L, status, NULL);
-}
-
-
-static int io_write (lua_State *L) {
- return g_write(L, getiofile(L, IO_OUTPUT), 1);
-}
-
-
-static int f_write (lua_State *L) {
- return g_write(L, tofile(L, 1), 2);
-}
-
-
-static int f_seek (lua_State *L) {
- static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
- static const char *const modenames[] = {"set", "cur", "end", NULL};
- FILE *f = tofile(L, 1);
- int op = luaL_findstring(luaL_optstring(L, 2, "cur"), modenames);
- long offset = luaL_optlong(L, 3, 0);
- luaL_argcheck(L, op != -1, 2, "invalid mode");
- op = fseek(f, offset, mode[op]);
- if (op)
- return pushresult(L, 0, NULL); /* error */
- else {
- lua_pushnumber(L, ftell(f));
- return 1;
- }
-}
-
-
-static int io_flush (lua_State *L) {
- return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
-}
-
-
-static int f_flush (lua_State *L) {
- return pushresult(L, fflush(tofile(L, 1)) == 0, NULL);
-}
-
-
-static const luaL_reg iolib[] = {
- {"input", io_input},
- {"output", io_output},
- {"lines", io_lines},
- {"close", io_close},
- {"flush", io_flush},
- {"open", io_open},
- {"popen", io_popen},
- {"read", io_read},
- {"tmpfile", io_tmpfile},
- {"type", io_type},
- {"write", io_write},
- {NULL, NULL}
-};
-
-
-static const luaL_reg flib[] = {
- {"flush", f_flush},
- {"read", f_read},
- {"lines", f_lines},
- {"seek", f_seek},
- {"write", f_write},
- {"close", io_close},
- {"__gc", io_gc},
- {"__tostring", io_tostring},
- {NULL, NULL}
-};
-
-
-static void createmeta (lua_State *L) {
- luaL_newmetatable(L, FILEHANDLE); /* create new metatable for file handles */
- /* file methods */
- lua_pushliteral(L, "__index");
- lua_pushvalue(L, -2); /* push metatable */
- lua_rawset(L, -3); /* metatable.__index = metatable */
- luaL_openlib(L, NULL, flib, 0);
-}
-
-/* }====================================================== */
-
-
-/*
-** {======================================================
-** Other O.S. Operations
-** =======================================================
-*/
-
-static int io_execute (lua_State *L) {
- lua_pushnumber(L, system(luaL_checkstring(L, 1)));
- return 1;
-}
-
-
-static int io_remove (lua_State *L) {
- const char *filename = luaL_checkstring(L, 1);
- return pushresult(L, remove(filename) == 0, filename);
-}
-
-
-static int io_rename (lua_State *L) {
- const char *fromname = luaL_checkstring(L, 1);
- const char *toname = luaL_checkstring(L, 2);
- return pushresult(L, rename(fromname, toname) == 0, fromname);
-}
-
-
-static int io_tmpname (lua_State *L) {
-#if !USE_TMPNAME
- luaL_error(L, "`tmpname' not supported");
- return 0;
-#else
- char buff[L_tmpnam];
- if (tmpnam(buff) != buff)
- return luaL_error(L, "unable to generate a unique filename in `tmpname'");
- lua_pushstring(L, buff);
- return 1;
-#endif
-}
-
-
-static int io_getenv (lua_State *L) {
- lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
- return 1;
-}
-
-
-static int io_clock (lua_State *L) {
- lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
- return 1;
-}
-
-
-/*
-** {======================================================
-** Time/Date operations
-** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
-** wday=%w+1, yday=%j, isdst=? }
-** =======================================================
-*/
-
-static void setfield (lua_State *L, const char *key, int value) {
- lua_pushstring(L, key);
- lua_pushnumber(L, value);
- lua_rawset(L, -3);
-}
-
-static void setboolfield (lua_State *L, const char *key, int value) {
- lua_pushstring(L, key);
- lua_pushboolean(L, value);
- lua_rawset(L, -3);
-}
-
-static int getboolfield (lua_State *L, const char *key) {
- int res;
- lua_pushstring(L, key);
- lua_gettable(L, -2);
- res = lua_toboolean(L, -1);
- lua_pop(L, 1);
- return res;
-}
-
-
-static int getfield (lua_State *L, const char *key, int d) {
- int res;
- lua_pushstring(L, key);
- lua_gettable(L, -2);
- if (lua_isnumber(L, -1))
- res = (int)(lua_tonumber(L, -1));
- else {
- if (d == -2)
- return luaL_error(L, "field `%s' missing in date table", key);
- res = d;
- }
- lua_pop(L, 1);
- return res;
-}
-
-
-static int io_date (lua_State *L) {
- const char *s = luaL_optstring(L, 1, "%c");
- time_t t = (time_t)(luaL_optnumber(L, 2, -1));
- struct tm *stm;
- if (t == (time_t)(-1)) /* no time given? */
- t = time(NULL); /* use current time */
- if (*s == '!') { /* UTC? */
- stm = gmtime(&t);
- s++; /* skip `!' */
- }
- else
- stm = localtime(&t);
- if (stm == NULL) /* invalid date? */
- lua_pushnil(L);
- else if (strcmp(s, "*t") == 0) {
- lua_newtable(L);
- setfield(L, "sec", stm->tm_sec);
- setfield(L, "min", stm->tm_min);
- setfield(L, "hour", stm->tm_hour);
- setfield(L, "day", stm->tm_mday);
- setfield(L, "month", stm->tm_mon+1);
- setfield(L, "year", stm->tm_year+1900);
- setfield(L, "wday", stm->tm_wday+1);
- setfield(L, "yday", stm->tm_yday+1);
- setboolfield(L, "isdst", stm->tm_isdst);
- }
- else {
- char b[256];
- if (strftime(b, sizeof(b), s, stm))
- lua_pushstring(L, b);
- else
- return luaL_error(L, "`date' format too long");
- }
- return 1;
-}
-
-
-static int io_time (lua_State *L) {
- if (lua_isnoneornil(L, 1)) /* called without args? */
- lua_pushnumber(L, time(NULL)); /* return current time */
- else {
- time_t t;
- struct tm ts;
- luaL_checktype(L, 1, LUA_TTABLE);
- lua_settop(L, 1); /* make sure table is at the top */
- ts.tm_sec = getfield(L, "sec", 0);
- ts.tm_min = getfield(L, "min", 0);
- ts.tm_hour = getfield(L, "hour", 12);
- ts.tm_mday = getfield(L, "day", -2);
- ts.tm_mon = getfield(L, "month", -2) - 1;
- ts.tm_year = getfield(L, "year", -2) - 1900;
- ts.tm_isdst = getboolfield(L, "isdst");
- t = mktime(&ts);
- if (t == (time_t)(-1))
- lua_pushnil(L);
- else
- lua_pushnumber(L, t);
- }
- return 1;
-}
-
-
-static int io_difftime (lua_State *L) {
- lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
- (time_t)(luaL_optnumber(L, 2, 0))));
- return 1;
-}
-
-/* }====================================================== */
-
-
-static int io_setloc (lua_State *L) {
- static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
- LC_NUMERIC, LC_TIME};
- static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
- "numeric", "time", NULL};
- const char *l = lua_tostring(L, 1);
- int op = luaL_findstring(luaL_optstring(L, 2, "all"), catnames);
- luaL_argcheck(L, l || lua_isnoneornil(L, 1), 1, "string expected");
- luaL_argcheck(L, op != -1, 2, "invalid option");
- lua_pushstring(L, setlocale(cat[op], l));
- return 1;
-}
-
-
-static int io_exit (lua_State *L) {
- exit(luaL_optint(L, 1, EXIT_SUCCESS));
- return 0; /* to avoid warnings */
-}
-
-static const luaL_reg syslib[] = {
- {"clock", io_clock},
- {"date", io_date},
- {"difftime", io_difftime},
- {"execute", io_execute},
- {"exit", io_exit},
- {"getenv", io_getenv},
- {"remove", io_remove},
- {"rename", io_rename},
- {"setlocale", io_setloc},
- {"time", io_time},
- {"tmpname", io_tmpname},
- {NULL, NULL}
-};
-
-/* }====================================================== */
-
-
-
-LUALIB_API int luaopen_io (lua_State *L) {
- luaL_openlib(L, LUA_OSLIBNAME, syslib, 0);
- createmeta(L);
- lua_pushvalue(L, -1);
- luaL_openlib(L, LUA_IOLIBNAME, iolib, 1);
- /* put predefined file handles into `io' table */
- registerfile(L, stdin, "stdin", IO_INPUT);
- registerfile(L, stdout, "stdout", IO_OUTPUT);
- registerfile(L, stderr, "stderr", NULL);
- return 1;
-}
-
+++ /dev/null
-/*
-** $Id: lmathlib.c,v 1.56 2003/03/11 12:30:37 roberto Exp $
-** Standard mathematical library
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-#include <math.h>
-
-#define lmathlib_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-#undef PI
-#define PI (3.14159265358979323846)
-#define RADIANS_PER_DEGREE (PI/180.0)
-
-
-
-/*
-** If you want Lua to operate in degrees (instead of radians),
-** define USE_DEGREES
-*/
-#ifdef USE_DEGREES
-#define FROMRAD(a) ((a)/RADIANS_PER_DEGREE)
-#define TORAD(a) ((a)*RADIANS_PER_DEGREE)
-#else
-#define FROMRAD(a) (a)
-#define TORAD(a) (a)
-#endif
-
-
-static int math_abs (lua_State *L) {
- lua_pushnumber(L, fabs(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_sin (lua_State *L) {
- lua_pushnumber(L, sin(TORAD(luaL_checknumber(L, 1))));
- return 1;
-}
-
-static int math_cos (lua_State *L) {
- lua_pushnumber(L, cos(TORAD(luaL_checknumber(L, 1))));
- return 1;
-}
-
-static int math_tan (lua_State *L) {
- lua_pushnumber(L, tan(TORAD(luaL_checknumber(L, 1))));
- return 1;
-}
-
-static int math_asin (lua_State *L) {
- lua_pushnumber(L, FROMRAD(asin(luaL_checknumber(L, 1))));
- return 1;
-}
-
-static int math_acos (lua_State *L) {
- lua_pushnumber(L, FROMRAD(acos(luaL_checknumber(L, 1))));
- return 1;
-}
-
-static int math_atan (lua_State *L) {
- lua_pushnumber(L, FROMRAD(atan(luaL_checknumber(L, 1))));
- return 1;
-}
-
-static int math_atan2 (lua_State *L) {
- lua_pushnumber(L, FROMRAD(atan2(luaL_checknumber(L, 1), luaL_checknumber(L, 2))));
- return 1;
-}
-
-static int math_ceil (lua_State *L) {
- lua_pushnumber(L, ceil(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_floor (lua_State *L) {
- lua_pushnumber(L, floor(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_mod (lua_State *L) {
- lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
- return 1;
-}
-
-static int math_sqrt (lua_State *L) {
- lua_pushnumber(L, sqrt(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_pow (lua_State *L) {
- lua_pushnumber(L, pow(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
- return 1;
-}
-
-static int math_log (lua_State *L) {
- lua_pushnumber(L, log(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_log10 (lua_State *L) {
- lua_pushnumber(L, log10(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_exp (lua_State *L) {
- lua_pushnumber(L, exp(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_deg (lua_State *L) {
- lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE);
- return 1;
-}
-
-static int math_rad (lua_State *L) {
- lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE);
- return 1;
-}
-
-static int math_frexp (lua_State *L) {
- int e;
- lua_pushnumber(L, frexp(luaL_checknumber(L, 1), &e));
- lua_pushnumber(L, e);
- return 2;
-}
-
-static int math_ldexp (lua_State *L) {
- lua_pushnumber(L, ldexp(luaL_checknumber(L, 1), luaL_checkint(L, 2)));
- return 1;
-}
-
-
-
-static int math_min (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- lua_Number dmin = luaL_checknumber(L, 1);
- int i;
- for (i=2; i<=n; i++) {
- lua_Number d = luaL_checknumber(L, i);
- if (d < dmin)
- dmin = d;
- }
- lua_pushnumber(L, dmin);
- return 1;
-}
-
-
-static int math_max (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- lua_Number dmax = luaL_checknumber(L, 1);
- int i;
- for (i=2; i<=n; i++) {
- lua_Number d = luaL_checknumber(L, i);
- if (d > dmax)
- dmax = d;
- }
- lua_pushnumber(L, dmax);
- return 1;
-}
-
-
-static int math_random (lua_State *L) {
- /* the `%' avoids the (rare) case of r==1, and is needed also because on
- some systems (SunOS!) `rand()' may return a value larger than RAND_MAX */
- lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
- switch (lua_gettop(L)) { /* check number of arguments */
- case 0: { /* no arguments */
- lua_pushnumber(L, r); /* Number between 0 and 1 */
- break;
- }
- case 1: { /* only upper limit */
- int u = luaL_checkint(L, 1);
- luaL_argcheck(L, 1<=u, 1, "interval is empty");
- lua_pushnumber(L, (int)floor(r*u)+1); /* int between 1 and `u' */
- break;
- }
- case 2: { /* lower and upper limits */
- int l = luaL_checkint(L, 1);
- int u = luaL_checkint(L, 2);
- luaL_argcheck(L, l<=u, 2, "interval is empty");
- lua_pushnumber(L, (int)floor(r*(u-l+1))+l); /* int between `l' and `u' */
- break;
- }
- default: return luaL_error(L, "wrong number of arguments");
- }
- return 1;
-}
-
-
-static int math_randomseed (lua_State *L) {
- srand(luaL_checkint(L, 1));
- return 0;
-}
-
-
-static const luaL_reg mathlib[] = {
- {"abs", math_abs},
- {"sin", math_sin},
- {"cos", math_cos},
- {"tan", math_tan},
- {"asin", math_asin},
- {"acos", math_acos},
- {"atan", math_atan},
- {"atan2", math_atan2},
- {"ceil", math_ceil},
- {"floor", math_floor},
- {"mod", math_mod},
- {"frexp", math_frexp},
- {"ldexp", math_ldexp},
- {"sqrt", math_sqrt},
- {"min", math_min},
- {"max", math_max},
- {"log", math_log},
- {"log10", math_log10},
- {"exp", math_exp},
- {"deg", math_deg},
- {"pow", math_pow},
- {"rad", math_rad},
- {"random", math_random},
- {"randomseed", math_randomseed},
- {NULL, NULL}
-};
-
-
-/*
-** Open math library
-*/
-LUALIB_API int luaopen_math (lua_State *L) {
- luaL_openlib(L, LUA_MATHLIBNAME, mathlib, 0);
- lua_pushliteral(L, "pi");
- lua_pushnumber(L, PI);
- lua_settable(L, -3);
- lua_pushliteral(L, "__pow");
- lua_pushcfunction(L, math_pow);
- lua_settable(L, LUA_GLOBALSINDEX);
- return 1;
-}
-
+++ /dev/null
-/*
-** $Id: loadlib.c,v 1.4 2003/04/07 20:11:53 roberto Exp $
-** Dynamic library loader for Lua
-** See Copyright Notice in lua.h
-*
-* This Lua library exports a single function, called loadlib, which is
-* called from Lua as loadlib(lib,init), where lib is the full name of the
-* library to be loaded (including the complete path) and init is the name
-* of a function to be called after the library is loaded. Typically, this
-* function will register other functions, thus making the complete library
-* available to Lua. The init function is *not* automatically called by
-* loadlib. Instead, loadlib returns the init function as a Lua function
-* that the client can call when it thinks is appropriate. In the case of
-* errors, loadlib returns nil and two strings describing the error.
-* The first string is supplied by the operating system; it should be
-* informative and useful for error messages. The second string is "open",
-* "init", or "absent" to identify the error and is meant to be used for
-* making decisions without having to look into the first string (whose
-* format is system-dependent).
-*
-* This module contains an implementation of loadlib for Unix systems that
-* have dlfcn, an implementation for Windows, and a stub for other systems.
-* See the list at the end of this file for some links to available
-* implementations of dlfcn and interfaces to other native dynamic loaders
-* on top of which loadlib could be implemented.
-*
-*/
-
-#include "lua.h"
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-#undef LOADLIB
-
-
-#ifdef USE_DLOPEN
-#define LOADLIB
-/*
-* This is an implementation of loadlib based on the dlfcn interface.
-* The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
-* NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least
-* as an emulation layer on top of native functions.
-*/
-
-#include <dlfcn.h>
-
-static int loadlib(lua_State *L)
-{
- const char *path=luaL_checkstring(L,1);
- const char *init=luaL_checkstring(L,2);
- void *lib=dlopen(path,RTLD_NOW);
- if (lib!=NULL)
- {
- lua_CFunction f=(lua_CFunction) dlsym(lib,init);
- if (f!=NULL)
- {
- lua_pushlightuserdata(L,lib);
- lua_pushcclosure(L,f,1);
- return 1;
- }
- }
- /* else return appropriate error messages */
- lua_pushnil(L);
- lua_pushstring(L,dlerror());
- lua_pushstring(L,(lib!=NULL) ? "init" : "open");
- if (lib!=NULL) dlclose(lib);
- return 3;
-}
-
-#endif
-
-
-
-/*
-** In Windows, default is to use dll; otherwise, default is not to use dll
-*/
-#ifndef USE_DLL
-#ifdef _WIN32
-#define USE_DLL 1
-#else
-#define USE_DLL 0
-#endif
-#endif
-
-
-#if USE_DLL
-#define LOADLIB
-/*
-* This is an implementation of loadlib for Windows using native functions.
-*/
-
-#include <windows.h>
-
-static void pusherror(lua_State *L)
-{
- int error=GetLastError();
- char buffer[128];
- if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
- 0, error, 0, buffer, sizeof(buffer), 0))
- lua_pushstring(L,buffer);
- else
- lua_pushfstring(L,"system error %d\n",error);
-}
-
-static int loadlib(lua_State *L)
-{
- const char *path=luaL_checkstring(L,1);
- const char *init=luaL_checkstring(L,2);
- HINSTANCE lib=LoadLibrary(path);
- if (lib!=NULL)
- {
- lua_CFunction f=(lua_CFunction) GetProcAddress(lib,init);
- if (f!=NULL)
- {
- lua_pushlightuserdata(L,lib);
- lua_pushcclosure(L,f,1);
- return 1;
- }
- }
- lua_pushnil(L);
- pusherror(L);
- lua_pushstring(L,(lib!=NULL) ? "init" : "open");
- if (lib!=NULL) FreeLibrary(lib);
- return 3;
-}
-
-#endif
-
-
-
-#ifndef LOADLIB
-/* Fallback for other systems */
-
-/*
-** Those systems support dlopen, so they should have defined USE_DLOPEN.
-** The default (no)implementation gives them a special error message.
-*/
-#ifdef linux
-#define LOADLIB
-#endif
-
-#ifdef sun
-#define LOADLIB
-#endif
-
-#ifdef sgi
-#define LOADLIB
-#endif
-
-#ifdef BSD
-#define LOADLIB
-#endif
-
-#ifdef _WIN32
-#define LOADLIB
-#endif
-
-#ifdef LOADLIB
-#undef LOADLIB
-#define LOADLIB "`loadlib' not installed (check your Lua configuration)"
-#else
-#define LOADLIB "`loadlib' not supported"
-#endif
-
-static int loadlib(lua_State *L)
-{
- lua_pushnil(L);
- lua_pushliteral(L,LOADLIB);
- lua_pushliteral(L,"absent");
- return 3;
-}
-#endif
-
-LUALIB_API int luaopen_loadlib (lua_State *L)
-{
- lua_register(L,"loadlib",loadlib);
- return 0;
-}
-
-/*
-* Here are some links to available implementations of dlfcn and
-* interfaces to other native dynamic loaders on top of which loadlib
-* could be implemented. Please send contributions and corrections to us.
-*
-* AIX
-* Starting with AIX 4.2, dlfcn is included in the base OS.
-* There is also an emulation package available.
-* http://www.faqs.org/faqs/aix-faq/part4/section-21.html
-*
-* HPUX
-* HPUX 11 has dlfcn. For HPUX 10 use shl_*.
-* http://www.geda.seul.org/mailinglist/geda-dev37/msg00094.html
-* http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html
-*
-* Macintosh, Windows
-* http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html
-*
-* Mac OS X/Darwin
-* http://www.opendarwin.org/projects/dlcompat/
-*
-* GLIB has wrapper code for BeOS, OS2, Unix and Windows
-* http://cvs.gnome.org/lxr/source/glib/gmodule/
-*
-*/
+++ /dev/null
-/*
-** $Id: lstrlib.c,v 1.98 2003/04/03 13:35:34 roberto Exp $
-** Standard library for string operations and pattern-matching
-** See Copyright Notice in lua.h
-*/
-
-
-#include <ctype.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lstrlib_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-/* macro to `unsign' a character */
-#ifndef uchar
-#define uchar(c) ((unsigned char)(c))
-#endif
-
-
-typedef long sint32; /* a signed version for size_t */
-
-
-static int str_len (lua_State *L) {
- size_t l;
- luaL_checklstring(L, 1, &l);
- lua_pushnumber(L, (lua_Number)l);
- return 1;
-}
-
-
-static sint32 posrelat (sint32 pos, size_t len) {
- /* relative string position: negative means back from end */
- return (pos>=0) ? pos : (sint32)len+pos+1;
-}
-
-
-static int str_sub (lua_State *L) {
- size_t l;
- const char *s = luaL_checklstring(L, 1, &l);
- sint32 start = posrelat(luaL_checklong(L, 2), l);
- sint32 end = posrelat(luaL_optlong(L, 3, -1), l);
- if (start < 1) start = 1;
- if (end > (sint32)l) end = (sint32)l;
- if (start <= end)
- lua_pushlstring(L, s+start-1, end-start+1);
- else lua_pushliteral(L, "");
- return 1;
-}
-
-
-static int str_lower (lua_State *L) {
- size_t l;
- size_t i;
- luaL_Buffer b;
- const char *s = luaL_checklstring(L, 1, &l);
- luaL_buffinit(L, &b);
- for (i=0; i<l; i++)
- luaL_putchar(&b, tolower(uchar(s[i])));
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static int str_upper (lua_State *L) {
- size_t l;
- size_t i;
- luaL_Buffer b;
- const char *s = luaL_checklstring(L, 1, &l);
- luaL_buffinit(L, &b);
- for (i=0; i<l; i++)
- luaL_putchar(&b, toupper(uchar(s[i])));
- luaL_pushresult(&b);
- return 1;
-}
-
-static int str_rep (lua_State *L) {
- size_t l;
- luaL_Buffer b;
- const char *s = luaL_checklstring(L, 1, &l);
- int n = luaL_checkint(L, 2);
- luaL_buffinit(L, &b);
- while (n-- > 0)
- luaL_addlstring(&b, s, l);
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static int str_byte (lua_State *L) {
- size_t l;
- const char *s = luaL_checklstring(L, 1, &l);
- sint32 pos = posrelat(luaL_optlong(L, 2, 1), l);
- if (pos <= 0 || (size_t)(pos) > l) /* index out of range? */
- return 0; /* no answer */
- lua_pushnumber(L, uchar(s[pos-1]));
- return 1;
-}
-
-
-static int str_char (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- int i;
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- for (i=1; i<=n; i++) {
- int c = luaL_checkint(L, i);
- luaL_argcheck(L, uchar(c) == c, i, "invalid value");
- luaL_putchar(&b, uchar(c));
- }
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static int writer (lua_State *L, const void* b, size_t size, void* B) {
- (void)L;
- luaL_addlstring((luaL_Buffer*) B, (const char *)b, size);
- return 1;
-}
-
-
-static int str_dump (lua_State *L) {
- luaL_Buffer b;
- luaL_checktype(L, 1, LUA_TFUNCTION);
- luaL_buffinit(L,&b);
- if (!lua_dump(L, writer, &b))
- luaL_error(L, "unable to dump given function");
- luaL_pushresult(&b);
- return 1;
-}
-
-
-
-/*
-** {======================================================
-** PATTERN MATCHING
-** =======================================================
-*/
-
-#ifndef MAX_CAPTURES
-#define MAX_CAPTURES 32 /* arbitrary limit */
-#endif
-
-
-#define CAP_UNFINISHED (-1)
-#define CAP_POSITION (-2)
-
-typedef struct MatchState {
- const char *src_init; /* init of source string */
- const char *src_end; /* end (`\0') of source string */
- lua_State *L;
- int level; /* total number of captures (finished or unfinished) */
- struct {
- const char *init;
- sint32 len;
- } capture[MAX_CAPTURES];
-} MatchState;
-
-
-#define ESC '%'
-#define SPECIALS "^$*+?.([%-"
-
-
-static int check_capture (MatchState *ms, int l) {
- l -= '1';
- if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
- return luaL_error(ms->L, "invalid capture index");
- return l;
-}
-
-
-static int capture_to_close (MatchState *ms) {
- int level = ms->level;
- for (level--; level>=0; level--)
- if (ms->capture[level].len == CAP_UNFINISHED) return level;
- return luaL_error(ms->L, "invalid pattern capture");
-}
-
-
-static const char *luaI_classend (MatchState *ms, const char *p) {
- switch (*p++) {
- case ESC: {
- if (*p == '\0')
- luaL_error(ms->L, "malformed pattern (ends with `%')");
- return p+1;
- }
- case '[': {
- if (*p == '^') p++;
- do { /* look for a `]' */
- if (*p == '\0')
- luaL_error(ms->L, "malformed pattern (missing `]')");
- if (*(p++) == ESC && *p != '\0')
- p++; /* skip escapes (e.g. `%]') */
- } while (*p != ']');
- return p+1;
- }
- default: {
- return p;
- }
- }
-}
-
-
-static int match_class (int c, int cl) {
- int res;
- switch (tolower(cl)) {
- case 'a' : res = isalpha(c); break;
- case 'c' : res = iscntrl(c); break;
- case 'd' : res = isdigit(c); break;
- case 'l' : res = islower(c); break;
- case 'p' : res = ispunct(c); break;
- case 's' : res = isspace(c); break;
- case 'u' : res = isupper(c); break;
- case 'w' : res = isalnum(c); break;
- case 'x' : res = isxdigit(c); break;
- case 'z' : res = (c == 0); break;
- default: return (cl == c);
- }
- return (islower(cl) ? res : !res);
-}
-
-
-static int matchbracketclass (int c, const char *p, const char *ec) {
- int sig = 1;
- if (*(p+1) == '^') {
- sig = 0;
- p++; /* skip the `^' */
- }
- while (++p < ec) {
- if (*p == ESC) {
- p++;
- if (match_class(c, *p))
- return sig;
- }
- else if ((*(p+1) == '-') && (p+2 < ec)) {
- p+=2;
- if (uchar(*(p-2)) <= c && c <= uchar(*p))
- return sig;
- }
- else if (uchar(*p) == c) return sig;
- }
- return !sig;
-}
-
-
-static int luaI_singlematch (int c, const char *p, const char *ep) {
- switch (*p) {
- case '.': return 1; /* matches any char */
- case ESC: return match_class(c, *(p+1));
- case '[': return matchbracketclass(c, p, ep-1);
- default: return (uchar(*p) == c);
- }
-}
-
-
-static const char *match (MatchState *ms, const char *s, const char *p);
-
-
-static const char *matchbalance (MatchState *ms, const char *s,
- const char *p) {
- if (*p == 0 || *(p+1) == 0)
- luaL_error(ms->L, "unbalanced pattern");
- if (*s != *p) return NULL;
- else {
- int b = *p;
- int e = *(p+1);
- int cont = 1;
- while (++s < ms->src_end) {
- if (*s == e) {
- if (--cont == 0) return s+1;
- }
- else if (*s == b) cont++;
- }
- }
- return NULL; /* string ends out of balance */
-}
-
-
-static const char *max_expand (MatchState *ms, const char *s,
- const char *p, const char *ep) {
- sint32 i = 0; /* counts maximum expand for item */
- while ((s+i)<ms->src_end && luaI_singlematch(uchar(*(s+i)), p, ep))
- i++;
- /* keeps trying to match with the maximum repetitions */
- while (i>=0) {
- const char *res = match(ms, (s+i), ep+1);
- if (res) return res;
- i--; /* else didn't match; reduce 1 repetition to try again */
- }
- return NULL;
-}
-
-
-static const char *min_expand (MatchState *ms, const char *s,
- const char *p, const char *ep) {
- for (;;) {
- const char *res = match(ms, s, ep+1);
- if (res != NULL)
- return res;
- else if (s<ms->src_end && luaI_singlematch(uchar(*s), p, ep))
- s++; /* try with one more repetition */
- else return NULL;
- }
-}
-
-
-static const char *start_capture (MatchState *ms, const char *s,
- const char *p, int what) {
- const char *res;
- int level = ms->level;
- if (level >= MAX_CAPTURES) luaL_error(ms->L, "too many captures");
- ms->capture[level].init = s;
- ms->capture[level].len = what;
- ms->level = level+1;
- if ((res=match(ms, s, p)) == NULL) /* match failed? */
- ms->level--; /* undo capture */
- return res;
-}
-
-
-static const char *end_capture (MatchState *ms, const char *s,
- const char *p) {
- int l = capture_to_close(ms);
- const char *res;
- ms->capture[l].len = s - ms->capture[l].init; /* close capture */
- if ((res = match(ms, s, p)) == NULL) /* match failed? */
- ms->capture[l].len = CAP_UNFINISHED; /* undo capture */
- return res;
-}
-
-
-static const char *match_capture (MatchState *ms, const char *s, int l) {
- size_t len;
- l = check_capture(ms, l);
- len = ms->capture[l].len;
- if ((size_t)(ms->src_end-s) >= len &&
- memcmp(ms->capture[l].init, s, len) == 0)
- return s+len;
- else return NULL;
-}
-
-
-static const char *match (MatchState *ms, const char *s, const char *p) {
- init: /* using goto's to optimize tail recursion */
- switch (*p) {
- case '(': { /* start capture */
- if (*(p+1) == ')') /* position capture? */
- return start_capture(ms, s, p+2, CAP_POSITION);
- else
- return start_capture(ms, s, p+1, CAP_UNFINISHED);
- }
- case ')': { /* end capture */
- return end_capture(ms, s, p+1);
- }
- case ESC: {
- switch (*(p+1)) {
- case 'b': { /* balanced string? */
- s = matchbalance(ms, s, p+2);
- if (s == NULL) return NULL;
- p+=4; goto init; /* else return match(ms, s, p+4); */
- }
- case 'f': { /* frontier? */
- const char *ep; char previous;
- p += 2;
- if (*p != '[')
- luaL_error(ms->L, "missing `[' after `%%f' in pattern");
- ep = luaI_classend(ms, p); /* points to what is next */
- previous = (s == ms->src_init) ? '\0' : *(s-1);
- if (matchbracketclass(uchar(previous), p, ep-1) ||
- !matchbracketclass(uchar(*s), p, ep-1)) return NULL;
- p=ep; goto init; /* else return match(ms, s, ep); */
- }
- default: {
- if (isdigit(uchar(*(p+1)))) { /* capture results (%0-%9)? */
- s = match_capture(ms, s, *(p+1));
- if (s == NULL) return NULL;
- p+=2; goto init; /* else return match(ms, s, p+2) */
- }
- goto dflt; /* case default */
- }
- }
- }
- case '\0': { /* end of pattern */
- return s; /* match succeeded */
- }
- case '$': {
- if (*(p+1) == '\0') /* is the `$' the last char in pattern? */
- return (s == ms->src_end) ? s : NULL; /* check end of string */
- else goto dflt;
- }
- default: dflt: { /* it is a pattern item */
- const char *ep = luaI_classend(ms, p); /* points to what is next */
- int m = s<ms->src_end && luaI_singlematch(uchar(*s), p, ep);
- switch (*ep) {
- case '?': { /* optional */
- const char *res;
- if (m && ((res=match(ms, s+1, ep+1)) != NULL))
- return res;
- p=ep+1; goto init; /* else return match(ms, s, ep+1); */
- }
- case '*': { /* 0 or more repetitions */
- return max_expand(ms, s, p, ep);
- }
- case '+': { /* 1 or more repetitions */
- return (m ? max_expand(ms, s+1, p, ep) : NULL);
- }
- case '-': { /* 0 or more repetitions (minimum) */
- return min_expand(ms, s, p, ep);
- }
- default: {
- if (!m) return NULL;
- s++; p=ep; goto init; /* else return match(ms, s+1, ep); */
- }
- }
- }
- }
-}
-
-
-
-static const char *lmemfind (const char *s1, size_t l1,
- const char *s2, size_t l2) {
- if (l2 == 0) return s1; /* empty strings are everywhere */
- else if (l2 > l1) return NULL; /* avoids a negative `l1' */
- else {
- const char *init; /* to search for a `*s2' inside `s1' */
- l2--; /* 1st char will be checked by `memchr' */
- l1 = l1-l2; /* `s2' cannot be found after that */
- while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) {
- init++; /* 1st char is already checked */
- if (memcmp(init, s2+1, l2) == 0)
- return init-1;
- else { /* correct `l1' and `s1' to try again */
- l1 -= init-s1;
- s1 = init;
- }
- }
- return NULL; /* not found */
- }
-}
-
-
-static void push_onecapture (MatchState *ms, int i) {
- int l = ms->capture[i].len;
- if (l == CAP_UNFINISHED) luaL_error(ms->L, "unfinished capture");
- if (l == CAP_POSITION)
- lua_pushnumber(ms->L, (lua_Number)(ms->capture[i].init - ms->src_init + 1));
- else
- lua_pushlstring(ms->L, ms->capture[i].init, l);
-}
-
-
-static int push_captures (MatchState *ms, const char *s, const char *e) {
- int i;
- luaL_checkstack(ms->L, ms->level, "too many captures");
- if (ms->level == 0 && s) { /* no explicit captures? */
- lua_pushlstring(ms->L, s, e-s); /* return whole match */
- return 1;
- }
- else { /* return all captures */
- for (i=0; i<ms->level; i++)
- push_onecapture(ms, i);
- return ms->level; /* number of strings pushed */
- }
-}
-
-
-static int str_find (lua_State *L) {
- size_t l1, l2;
- const char *s = luaL_checklstring(L, 1, &l1);
- const char *p = luaL_checklstring(L, 2, &l2);
- sint32 init = posrelat(luaL_optlong(L, 3, 1), l1) - 1;
- if (init < 0) init = 0;
- else if ((size_t)(init) > l1) init = (sint32)l1;
- if (lua_toboolean(L, 4) || /* explicit request? */
- strpbrk(p, SPECIALS) == NULL) { /* or no special characters? */
- /* do a plain search */
- const char *s2 = lmemfind(s+init, l1-init, p, l2);
- if (s2) {
- lua_pushnumber(L, (lua_Number)(s2-s+1));
- lua_pushnumber(L, (lua_Number)(s2-s+l2));
- return 2;
- }
- }
- else {
- MatchState ms;
- int anchor = (*p == '^') ? (p++, 1) : 0;
- const char *s1=s+init;
- ms.L = L;
- ms.src_init = s;
- ms.src_end = s+l1;
- do {
- const char *res;
- ms.level = 0;
- if ((res=match(&ms, s1, p)) != NULL) {
- lua_pushnumber(L, (lua_Number)(s1-s+1)); /* start */
- lua_pushnumber(L, (lua_Number)(res-s)); /* end */
- return push_captures(&ms, NULL, 0) + 2;
- }
- } while (s1++<ms.src_end && !anchor);
- }
- lua_pushnil(L); /* not found */
- return 1;
-}
-
-
-static int gfind_aux (lua_State *L) {
- MatchState ms;
- const char *s = lua_tostring(L, lua_upvalueindex(1));
- size_t ls = lua_strlen(L, lua_upvalueindex(1));
- const char *p = lua_tostring(L, lua_upvalueindex(2));
- const char *src;
- ms.L = L;
- ms.src_init = s;
- ms.src_end = s+ls;
- for (src = s + (size_t)lua_tonumber(L, lua_upvalueindex(3));
- src <= ms.src_end;
- src++) {
- const char *e;
- ms.level = 0;
- if ((e = match(&ms, src, p)) != NULL) {
- int newstart = e-s;
- if (e == src) newstart++; /* empty match? go at least one position */
- lua_pushnumber(L, (lua_Number)newstart);
- lua_replace(L, lua_upvalueindex(3));
- return push_captures(&ms, src, e);
- }
- }
- return 0; /* not found */
-}
-
-
-static int gfind (lua_State *L) {
- luaL_checkstring(L, 1);
- luaL_checkstring(L, 2);
- lua_settop(L, 2);
- lua_pushnumber(L, 0);
- lua_pushcclosure(L, gfind_aux, 3);
- return 1;
-}
-
-
-static void add_s (MatchState *ms, luaL_Buffer *b,
- const char *s, const char *e) {
- lua_State *L = ms->L;
- if (lua_isstring(L, 3)) {
- const char *news = lua_tostring(L, 3);
- size_t l = lua_strlen(L, 3);
- size_t i;
- for (i=0; i<l; i++) {
- if (news[i] != ESC)
- luaL_putchar(b, news[i]);
- else {
- i++; /* skip ESC */
- if (!isdigit(uchar(news[i])))
- luaL_putchar(b, news[i]);
- else {
- int level = check_capture(ms, news[i]);
- push_onecapture(ms, level);
- luaL_addvalue(b); /* add capture to accumulated result */
- }
- }
- }
- }
- else { /* is a function */
- int n;
- lua_pushvalue(L, 3);
- n = push_captures(ms, s, e);
- lua_call(L, n, 1);
- if (lua_isstring(L, -1))
- luaL_addvalue(b); /* add return to accumulated result */
- else
- lua_pop(L, 1); /* function result is not a string: pop it */
- }
-}
-
-
-static int str_gsub (lua_State *L) {
- size_t srcl;
- const char *src = luaL_checklstring(L, 1, &srcl);
- const char *p = luaL_checkstring(L, 2);
- int max_s = luaL_optint(L, 4, srcl+1);
- int anchor = (*p == '^') ? (p++, 1) : 0;
- int n = 0;
- MatchState ms;
- luaL_Buffer b;
- luaL_argcheck(L,
- lua_gettop(L) >= 3 && (lua_isstring(L, 3) || lua_isfunction(L, 3)),
- 3, "string or function expected");
- luaL_buffinit(L, &b);
- ms.L = L;
- ms.src_init = src;
- ms.src_end = src+srcl;
- while (n < max_s) {
- const char *e;
- ms.level = 0;
- e = match(&ms, src, p);
- if (e) {
- n++;
- add_s(&ms, &b, src, e);
- }
- if (e && e>src) /* non empty match? */
- src = e; /* skip it */
- else if (src < ms.src_end)
- luaL_putchar(&b, *src++);
- else break;
- if (anchor) break;
- }
- luaL_addlstring(&b, src, ms.src_end-src);
- luaL_pushresult(&b);
- lua_pushnumber(L, (lua_Number)n); /* number of substitutions */
- return 2;
-}
-
-/* }====================================================== */
-
-
-/* maximum size of each formatted item (> len(format('%99.99f', -1e308))) */
-#define MAX_ITEM 512
-/* maximum size of each format specification (such as '%-099.99d') */
-#define MAX_FORMAT 20
-
-
-static void luaI_addquoted (lua_State *L, luaL_Buffer *b, int arg) {
- size_t l;
- const char *s = luaL_checklstring(L, arg, &l);
- luaL_putchar(b, '"');
- while (l--) {
- switch (*s) {
- case '"': case '\\': case '\n': {
- luaL_putchar(b, '\\');
- luaL_putchar(b, *s);
- break;
- }
- case '\0': {
- luaL_addlstring(b, "\\000", 4);
- break;
- }
- default: {
- luaL_putchar(b, *s);
- break;
- }
- }
- s++;
- }
- luaL_putchar(b, '"');
-}
-
-
-static const char *scanformat (lua_State *L, const char *strfrmt,
- char *form, int *hasprecision) {
- const char *p = strfrmt;
- while (strchr("-+ #0", *p)) p++; /* skip flags */
- if (isdigit(uchar(*p))) p++; /* skip width */
- if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
- if (*p == '.') {
- p++;
- *hasprecision = 1;
- if (isdigit(uchar(*p))) p++; /* skip precision */
- if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
- }
- if (isdigit(uchar(*p)))
- luaL_error(L, "invalid format (width or precision too long)");
- if (p-strfrmt+2 > MAX_FORMAT) /* +2 to include `%' and the specifier */
- luaL_error(L, "invalid format (too long)");
- form[0] = '%';
- strncpy(form+1, strfrmt, p-strfrmt+1);
- form[p-strfrmt+2] = 0;
- return p;
-}
-
-
-static int str_format (lua_State *L) {
- int arg = 1;
- size_t sfl;
- const char *strfrmt = luaL_checklstring(L, arg, &sfl);
- const char *strfrmt_end = strfrmt+sfl;
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- while (strfrmt < strfrmt_end) {
- if (*strfrmt != '%')
- luaL_putchar(&b, *strfrmt++);
- else if (*++strfrmt == '%')
- luaL_putchar(&b, *strfrmt++); /* %% */
- else { /* format item */
- char form[MAX_FORMAT]; /* to store the format (`%...') */
- char buff[MAX_ITEM]; /* to store the formatted item */
- int hasprecision = 0;
- if (isdigit(uchar(*strfrmt)) && *(strfrmt+1) == '$')
- return luaL_error(L, "obsolete option (d$) to `format'");
- arg++;
- strfrmt = scanformat(L, strfrmt, form, &hasprecision);
- switch (*strfrmt++) {
- case 'c': case 'd': case 'i': {
- sprintf(buff, form, luaL_checkint(L, arg));
- break;
- }
- case 'o': case 'u': case 'x': case 'X': {
- sprintf(buff, form, (unsigned int)(luaL_checknumber(L, arg)));
- break;
- }
- case 'e': case 'E': case 'f':
- case 'g': case 'G': {
- sprintf(buff, form, luaL_checknumber(L, arg));
- break;
- }
- case 'q': {
- luaI_addquoted(L, &b, arg);
- continue; /* skip the `addsize' at the end */
- }
- case 's': {
- size_t l;
- const char *s = luaL_checklstring(L, arg, &l);
- if (!hasprecision && l >= 100) {
- /* no precision and string is too long to be formatted;
- keep original string */
- lua_pushvalue(L, arg);
- luaL_addvalue(&b);
- continue; /* skip the `addsize' at the end */
- }
- else {
- sprintf(buff, form, s);
- break;
- }
- }
- default: { /* also treat cases `pnLlh' */
- return luaL_error(L, "invalid option to `format'");
- }
- }
- luaL_addlstring(&b, buff, strlen(buff));
- }
- }
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static const luaL_reg strlib[] = {
- {"len", str_len},
- {"sub", str_sub},
- {"lower", str_lower},
- {"upper", str_upper},
- {"char", str_char},
- {"rep", str_rep},
- {"byte", str_byte},
- {"format", str_format},
- {"dump", str_dump},
- {"find", str_find},
- {"gfind", gfind},
- {"gsub", str_gsub},
- {NULL, NULL}
-};
-
-
-/*
-** Open string library
-*/
-LUALIB_API int luaopen_string (lua_State *L) {
- luaL_openlib(L, LUA_STRLIBNAME, strlib, 0);
- return 1;
-}
-
+++ /dev/null
-/*
-** $Id: ltablib.c,v 1.21 2003/04/03 13:35:34 roberto Exp $
-** Library for Table Manipulation
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stddef.h>
-
-#define ltablib_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-#define aux_getn(L,n) (luaL_checktype(L, n, LUA_TTABLE), luaL_getn(L, n))
-
-
-static int luaB_foreachi (lua_State *L) {
- int i;
- int n = aux_getn(L, 1);
- luaL_checktype(L, 2, LUA_TFUNCTION);
- for (i=1; i<=n; i++) {
- lua_pushvalue(L, 2); /* function */
- lua_pushnumber(L, (lua_Number)i); /* 1st argument */
- lua_rawgeti(L, 1, i); /* 2nd argument */
- lua_call(L, 2, 1);
- if (!lua_isnil(L, -1))
- return 1;
- lua_pop(L, 1); /* remove nil result */
- }
- return 0;
-}
-
-
-static int luaB_foreach (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_checktype(L, 2, LUA_TFUNCTION);
- lua_pushnil(L); /* first key */
- for (;;) {
- if (lua_next(L, 1) == 0)
- return 0;
- lua_pushvalue(L, 2); /* function */
- lua_pushvalue(L, -3); /* key */
- lua_pushvalue(L, -3); /* value */
- lua_call(L, 2, 1);
- if (!lua_isnil(L, -1))
- return 1;
- lua_pop(L, 2); /* remove value and result */
- }
-}
-
-
-static int luaB_getn (lua_State *L) {
- lua_pushnumber(L, (lua_Number)aux_getn(L, 1));
- return 1;
-}
-
-
-static int luaB_setn (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_setn(L, 1, luaL_checkint(L, 2));
- return 0;
-}
-
-
-static int luaB_tinsert (lua_State *L) {
- int v = lua_gettop(L); /* number of arguments */
- int n = aux_getn(L, 1) + 1;
- int pos; /* where to insert new element */
- if (v == 2) /* called with only 2 arguments */
- pos = n; /* insert new element at the end */
- else {
- pos = luaL_checkint(L, 2); /* 2nd argument is the position */
- if (pos > n) n = pos; /* `grow' array if necessary */
- v = 3; /* function may be called with more than 3 args */
- }
- luaL_setn(L, 1, n); /* new size */
- while (--n >= pos) { /* move up elements */
- lua_rawgeti(L, 1, n);
- lua_rawseti(L, 1, n+1); /* t[n+1] = t[n] */
- }
- lua_pushvalue(L, v);
- lua_rawseti(L, 1, pos); /* t[pos] = v */
- return 0;
-}
-
-
-static int luaB_tremove (lua_State *L) {
- int n = aux_getn(L, 1);
- int pos = luaL_optint(L, 2, n);
- if (n <= 0) return 0; /* table is `empty' */
- luaL_setn(L, 1, n-1); /* t.n = n-1 */
- lua_rawgeti(L, 1, pos); /* result = t[pos] */
- for ( ;pos<n; pos++) {
- lua_rawgeti(L, 1, pos+1);
- lua_rawseti(L, 1, pos); /* t[pos] = t[pos+1] */
- }
- lua_pushnil(L);
- lua_rawseti(L, 1, n); /* t[n] = nil */
- return 1;
-}
-
-
-static int str_concat (lua_State *L) {
- luaL_Buffer b;
- size_t lsep;
- const char *sep = luaL_optlstring(L, 2, "", &lsep);
- int i = luaL_optint(L, 3, 1);
- int n = luaL_optint(L, 4, 0);
- luaL_checktype(L, 1, LUA_TTABLE);
- if (n == 0) n = luaL_getn(L, 1);
- luaL_buffinit(L, &b);
- for (; i <= n; i++) {
- lua_rawgeti(L, 1, i);
- luaL_argcheck(L, lua_isstring(L, -1), 1, "table contains non-strings");
- luaL_addvalue(&b);
- if (i != n)
- luaL_addlstring(&b, sep, lsep);
- }
- luaL_pushresult(&b);
- return 1;
-}
-
-
-
-/*
-** {======================================================
-** Quicksort
-** (based on `Algorithms in MODULA-3', Robert Sedgewick;
-** Addison-Wesley, 1993.)
-*/
-
-
-static void set2 (lua_State *L, int i, int j) {
- lua_rawseti(L, 1, i);
- lua_rawseti(L, 1, j);
-}
-
-static int sort_comp (lua_State *L, int a, int b) {
- if (!lua_isnil(L, 2)) { /* function? */
- int res;
- lua_pushvalue(L, 2);
- lua_pushvalue(L, a-1); /* -1 to compensate function */
- lua_pushvalue(L, b-2); /* -2 to compensate function and `a' */
- lua_call(L, 2, 1);
- res = lua_toboolean(L, -1);
- lua_pop(L, 1);
- return res;
- }
- else /* a < b? */
- return lua_lessthan(L, a, b);
-}
-
-static void auxsort (lua_State *L, int l, int u) {
- while (l < u) { /* for tail recursion */
- int i, j;
- /* sort elements a[l], a[(l+u)/2] and a[u] */
- lua_rawgeti(L, 1, l);
- lua_rawgeti(L, 1, u);
- if (sort_comp(L, -1, -2)) /* a[u] < a[l]? */
- set2(L, l, u); /* swap a[l] - a[u] */
- else
- lua_pop(L, 2);
- if (u-l == 1) break; /* only 2 elements */
- i = (l+u)/2;
- lua_rawgeti(L, 1, i);
- lua_rawgeti(L, 1, l);
- if (sort_comp(L, -2, -1)) /* a[i]<a[l]? */
- set2(L, i, l);
- else {
- lua_pop(L, 1); /* remove a[l] */
- lua_rawgeti(L, 1, u);
- if (sort_comp(L, -1, -2)) /* a[u]<a[i]? */
- set2(L, i, u);
- else
- lua_pop(L, 2);
- }
- if (u-l == 2) break; /* only 3 elements */
- lua_rawgeti(L, 1, i); /* Pivot */
- lua_pushvalue(L, -1);
- lua_rawgeti(L, 1, u-1);
- set2(L, i, u-1);
- /* a[l] <= P == a[u-1] <= a[u], only need to sort from l+1 to u-2 */
- i = l; j = u-1;
- for (;;) { /* invariant: a[l..i] <= P <= a[j..u] */
- /* repeat ++i until a[i] >= P */
- while (lua_rawgeti(L, 1, ++i), sort_comp(L, -1, -2)) {
- if (i>u) luaL_error(L, "invalid order function for sorting");
- lua_pop(L, 1); /* remove a[i] */
- }
- /* repeat --j until a[j] <= P */
- while (lua_rawgeti(L, 1, --j), sort_comp(L, -3, -1)) {
- if (j<l) luaL_error(L, "invalid order function for sorting");
- lua_pop(L, 1); /* remove a[j] */
- }
- if (j<i) {
- lua_pop(L, 3); /* pop pivot, a[i], a[j] */
- break;
- }
- set2(L, i, j);
- }
- lua_rawgeti(L, 1, u-1);
- lua_rawgeti(L, 1, i);
- set2(L, u-1, i); /* swap pivot (a[u-1]) with a[i] */
- /* a[l..i-1] <= a[i] == P <= a[i+1..u] */
- /* adjust so that smaller half is in [j..i] and larger one in [l..u] */
- if (i-l < u-i) {
- j=l; i=i-1; l=i+2;
- }
- else {
- j=i+1; i=u; u=j-2;
- }
- auxsort(L, j, i); /* call recursively the smaller one */
- } /* repeat the routine for the larger one */
-}
-
-static int luaB_sort (lua_State *L) {
- int n = aux_getn(L, 1);
- luaL_checkstack(L, 40, ""); /* assume array is smaller than 2^40 */
- if (!lua_isnoneornil(L, 2)) /* is there a 2nd argument? */
- luaL_checktype(L, 2, LUA_TFUNCTION);
- lua_settop(L, 2); /* make sure there is two arguments */
- auxsort(L, 1, n);
- return 0;
-}
-
-/* }====================================================== */
-
-
-static const luaL_reg tab_funcs[] = {
- {"concat", str_concat},
- {"foreach", luaB_foreach},
- {"foreachi", luaB_foreachi},
- {"getn", luaB_getn},
- {"setn", luaB_setn},
- {"sort", luaB_sort},
- {"insert", luaB_tinsert},
- {"remove", luaB_tremove},
- {NULL, NULL}
-};
-
-
-LUALIB_API int luaopen_table (lua_State *L) {
- luaL_openlib(L, LUA_TABLIBNAME, tab_funcs, 0);
- return 1;
-}
-
+++ /dev/null
-/*
-** $Id: llex.c,v 1.119 2003/03/24 12:39:34 roberto Exp $
-** Lexical Analyzer
-** See Copyright Notice in lua.h
-*/
-
-
-#include <ctype.h>
-#include <string.h>
-
-#define llex_c
-
-#include "lua.h"
-
-#include "ldo.h"
-#include "llex.h"
-#include "lobject.h"
-#include "lparser.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "lzio.h"
-
-
-
-#define next(LS) (LS->current = zgetc(LS->z))
-
-
-
-/* ORDER RESERVED */
-static const char *const token2string [] = {
- "and", "break", "do", "else", "elseif",
- "end", "false", "for", "function", "if",
- "in", "local", "nil", "not", "or", "repeat",
- "return", "then", "true", "until", "while", "*name",
- "..", "...", "==", ">=", "<=", "~=",
- "*number", "*string", "<eof>"
-};
-
-
-void luaX_init (lua_State *L) {
- int i;
- for (i=0; i<NUM_RESERVED; i++) {
- TString *ts = luaS_new(L, token2string[i]);
- luaS_fix(ts); /* reserved words are never collected */
- lua_assert(strlen(token2string[i])+1 <= TOKEN_LEN);
- ts->tsv.reserved = cast(lu_byte, i+1); /* reserved word */
- }
-}
-
-
-#define MAXSRC 80
-
-
-void luaX_checklimit (LexState *ls, int val, int limit, const char *msg) {
- if (val > limit) {
- msg = luaO_pushfstring(ls->L, "too many %s (limit=%d)", msg, limit);
- luaX_syntaxerror(ls, msg);
- }
-}
-
-
-void luaX_errorline (LexState *ls, const char *s, const char *token, int line) {
- lua_State *L = ls->L;
- char buff[MAXSRC];
- luaO_chunkid(buff, getstr(ls->source), MAXSRC);
- luaO_pushfstring(L, "%s:%d: %s near `%s'", buff, line, s, token);
- luaD_throw(L, LUA_ERRSYNTAX);
-}
-
-
-static void luaX_error (LexState *ls, const char *s, const char *token) {
- luaX_errorline(ls, s, token, ls->linenumber);
-}
-
-
-void luaX_syntaxerror (LexState *ls, const char *msg) {
- const char *lasttoken;
- switch (ls->t.token) {
- case TK_NAME:
- lasttoken = getstr(ls->t.seminfo.ts);
- break;
- case TK_STRING:
- case TK_NUMBER:
- lasttoken = luaZ_buffer(ls->buff);
- break;
- default:
- lasttoken = luaX_token2str(ls, ls->t.token);
- break;
- }
- luaX_error(ls, msg, lasttoken);
-}
-
-
-const char *luaX_token2str (LexState *ls, int token) {
- if (token < FIRST_RESERVED) {
- lua_assert(token == (unsigned char)token);
- return luaO_pushfstring(ls->L, "%c", token);
- }
- else
- return token2string[token-FIRST_RESERVED];
-}
-
-
-static void luaX_lexerror (LexState *ls, const char *s, int token) {
- if (token == TK_EOS)
- luaX_error(ls, s, luaX_token2str(ls, token));
- else
- luaX_error(ls, s, luaZ_buffer(ls->buff));
-}
-
-
-static void inclinenumber (LexState *LS) {
- next(LS); /* skip `\n' */
- ++LS->linenumber;
- luaX_checklimit(LS, LS->linenumber, MAX_INT, "lines in a chunk");
-}
-
-
-void luaX_setinput (lua_State *L, LexState *LS, ZIO *z, TString *source) {
- LS->L = L;
- LS->lookahead.token = TK_EOS; /* no look-ahead token */
- LS->z = z;
- LS->fs = NULL;
- LS->linenumber = 1;
- LS->lastline = 1;
- LS->source = source;
- next(LS); /* read first char */
- if (LS->current == '#') {
- do { /* skip first line */
- next(LS);
- } while (LS->current != '\n' && LS->current != EOZ);
- }
-}
-
-
-
-/*
-** =======================================================
-** LEXICAL ANALYZER
-** =======================================================
-*/
-
-
-/* use buffer to store names, literal strings and numbers */
-
-/* extra space to allocate when growing buffer */
-#define EXTRABUFF 32
-
-/* maximum number of chars that can be read without checking buffer size */
-#define MAXNOCHECK 5
-
-#define checkbuffer(LS, len) \
- if (((len)+MAXNOCHECK)*sizeof(char) > luaZ_sizebuffer((LS)->buff)) \
- luaZ_openspace((LS)->L, (LS)->buff, (len)+EXTRABUFF)
-
-#define save(LS, c, l) \
- (luaZ_buffer((LS)->buff)[l++] = cast(char, c))
-#define save_and_next(LS, l) (save(LS, LS->current, l), next(LS))
-
-
-static size_t readname (LexState *LS) {
- size_t l = 0;
- checkbuffer(LS, l);
- do {
- checkbuffer(LS, l);
- save_and_next(LS, l);
- } while (isalnum(LS->current) || LS->current == '_');
- save(LS, '\0', l);
- return l-1;
-}
-
-
-/* LUA_NUMBER */
-static void read_numeral (LexState *LS, int comma, SemInfo *seminfo) {
- size_t l = 0;
- checkbuffer(LS, l);
- if (comma) save(LS, '.', l);
- while (isdigit(LS->current)) {
- checkbuffer(LS, l);
- save_and_next(LS, l);
- }
- if (LS->current == '.') {
- save_and_next(LS, l);
- if (LS->current == '.') {
- save_and_next(LS, l);
- save(LS, '\0', l);
- luaX_lexerror(LS,
- "ambiguous syntax (decimal point x string concatenation)",
- TK_NUMBER);
- }
- }
- while (isdigit(LS->current)) {
- checkbuffer(LS, l);
- save_and_next(LS, l);
- }
- if (LS->current == 'e' || LS->current == 'E') {
- save_and_next(LS, l); /* read `E' */
- if (LS->current == '+' || LS->current == '-')
- save_and_next(LS, l); /* optional exponent sign */
- while (isdigit(LS->current)) {
- checkbuffer(LS, l);
- save_and_next(LS, l);
- }
- }
- save(LS, '\0', l);
- if (!luaO_str2d(luaZ_buffer(LS->buff), &seminfo->r))
- luaX_lexerror(LS, "malformed number", TK_NUMBER);
-}
-
-
-static void read_long_string (LexState *LS, SemInfo *seminfo) {
- int cont = 0;
- size_t l = 0;
- checkbuffer(LS, l);
- save(LS, '[', l); /* save first `[' */
- save_and_next(LS, l); /* pass the second `[' */
- if (LS->current == '\n') /* string starts with a newline? */
- inclinenumber(LS); /* skip it */
- for (;;) {
- checkbuffer(LS, l);
- switch (LS->current) {
- case EOZ:
- save(LS, '\0', l);
- luaX_lexerror(LS, (seminfo) ? "unfinished long string" :
- "unfinished long comment", TK_EOS);
- break; /* to avoid warnings */
- case '[':
- save_and_next(LS, l);
- if (LS->current == '[') {
- cont++;
- save_and_next(LS, l);
- }
- continue;
- case ']':
- save_and_next(LS, l);
- if (LS->current == ']') {
- if (cont == 0) goto endloop;
- cont--;
- save_and_next(LS, l);
- }
- continue;
- case '\n':
- save(LS, '\n', l);
- inclinenumber(LS);
- if (!seminfo) l = 0; /* reset buffer to avoid wasting space */
- continue;
- default:
- save_and_next(LS, l);
- }
- } endloop:
- save_and_next(LS, l); /* skip the second `]' */
- save(LS, '\0', l);
- if (seminfo)
- seminfo->ts = luaS_newlstr(LS->L, luaZ_buffer(LS->buff) + 2, l - 5);
-}
-
-
-static void read_string (LexState *LS, int del, SemInfo *seminfo) {
- size_t l = 0;
- checkbuffer(LS, l);
- save_and_next(LS, l);
- while (LS->current != del) {
- checkbuffer(LS, l);
- switch (LS->current) {
- case EOZ:
- save(LS, '\0', l);
- luaX_lexerror(LS, "unfinished string", TK_EOS);
- break; /* to avoid warnings */
- case '\n':
- save(LS, '\0', l);
- luaX_lexerror(LS, "unfinished string", TK_STRING);
- break; /* to avoid warnings */
- case '\\':
- next(LS); /* do not save the `\' */
- switch (LS->current) {
- case 'a': save(LS, '\a', l); next(LS); break;
- case 'b': save(LS, '\b', l); next(LS); break;
- case 'f': save(LS, '\f', l); next(LS); break;
- case 'n': save(LS, '\n', l); next(LS); break;
- case 'r': save(LS, '\r', l); next(LS); break;
- case 't': save(LS, '\t', l); next(LS); break;
- case 'v': save(LS, '\v', l); next(LS); break;
- case '\n': save(LS, '\n', l); inclinenumber(LS); break;
- case EOZ: break; /* will raise an error next loop */
- default: {
- if (!isdigit(LS->current))
- save_and_next(LS, l); /* handles \\, \", \', and \? */
- else { /* \xxx */
- int c = 0;
- int i = 0;
- do {
- c = 10*c + (LS->current-'0');
- next(LS);
- } while (++i<3 && isdigit(LS->current));
- if (c > UCHAR_MAX) {
- save(LS, '\0', l);
- luaX_lexerror(LS, "escape sequence too large", TK_STRING);
- }
- save(LS, c, l);
- }
- }
- }
- break;
- default:
- save_and_next(LS, l);
- }
- }
- save_and_next(LS, l); /* skip delimiter */
- save(LS, '\0', l);
- seminfo->ts = luaS_newlstr(LS->L, luaZ_buffer(LS->buff) + 1, l - 3);
-}
-
-
-int luaX_lex (LexState *LS, SemInfo *seminfo) {
- for (;;) {
- switch (LS->current) {
-
- case '\n': {
- inclinenumber(LS);
- continue;
- }
- case '-': {
- next(LS);
- if (LS->current != '-') return '-';
- /* else is a comment */
- next(LS);
- if (LS->current == '[' && (next(LS), LS->current == '['))
- read_long_string(LS, NULL); /* long comment */
- else /* short comment */
- while (LS->current != '\n' && LS->current != EOZ)
- next(LS);
- continue;
- }
- case '[': {
- next(LS);
- if (LS->current != '[') return '[';
- else {
- read_long_string(LS, seminfo);
- return TK_STRING;
- }
- }
- case '=': {
- next(LS);
- if (LS->current != '=') return '=';
- else { next(LS); return TK_EQ; }
- }
- case '<': {
- next(LS);
- if (LS->current != '=') return '<';
- else { next(LS); return TK_LE; }
- }
- case '>': {
- next(LS);
- if (LS->current != '=') return '>';
- else { next(LS); return TK_GE; }
- }
- case '~': {
- next(LS);
- if (LS->current != '=') return '~';
- else { next(LS); return TK_NE; }
- }
- case '"':
- case '\'': {
- read_string(LS, LS->current, seminfo);
- return TK_STRING;
- }
- case '.': {
- next(LS);
- if (LS->current == '.') {
- next(LS);
- if (LS->current == '.') {
- next(LS);
- return TK_DOTS; /* ... */
- }
- else return TK_CONCAT; /* .. */
- }
- else if (!isdigit(LS->current)) return '.';
- else {
- read_numeral(LS, 1, seminfo);
- return TK_NUMBER;
- }
- }
- case EOZ: {
- return TK_EOS;
- }
- default: {
- if (isspace(LS->current)) {
- next(LS);
- continue;
- }
- else if (isdigit(LS->current)) {
- read_numeral(LS, 0, seminfo);
- return TK_NUMBER;
- }
- else if (isalpha(LS->current) || LS->current == '_') {
- /* identifier or reserved word */
- size_t l = readname(LS);
- TString *ts = luaS_newlstr(LS->L, luaZ_buffer(LS->buff), l);
- if (ts->tsv.reserved > 0) /* reserved word? */
- return ts->tsv.reserved - 1 + FIRST_RESERVED;
- seminfo->ts = ts;
- return TK_NAME;
- }
- else {
- int c = LS->current;
- if (iscntrl(c))
- luaX_error(LS, "invalid control char",
- luaO_pushfstring(LS->L, "char(%d)", c));
- next(LS);
- return c; /* single-char tokens (+ - / ...) */
- }
- }
- }
- }
-}
-
-#undef next
+++ /dev/null
-/*
-** $Id: llex.h,v 1.47 2003/02/28 17:19:47 roberto Exp $
-** Lexical Analyzer
-** See Copyright Notice in lua.h
-*/
-
-#ifndef llex_h
-#define llex_h
-
-#include "lobject.h"
-#include "lzio.h"
-
-
-#define FIRST_RESERVED 257
-
-/* maximum length of a reserved word */
-#define TOKEN_LEN (sizeof("function")/sizeof(char))
-
-
-/*
-* WARNING: if you change the order of this enumeration,
-* grep "ORDER RESERVED"
-*/
-enum RESERVED {
- /* terminal symbols denoted by reserved words */
- TK_AND = FIRST_RESERVED, TK_BREAK,
- TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
- TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
- TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
- /* other terminal symbols */
- TK_NAME, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
- TK_STRING, TK_EOS
-};
-
-/* number of reserved words */
-#define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1))
-
-
-typedef union {
- lua_Number r;
- TString *ts;
-} SemInfo; /* semantics information */
-
-
-typedef struct Token {
- int token;
- SemInfo seminfo;
-} Token;
-
-
-typedef struct LexState {
- int current; /* current character (charint) */
- int linenumber; /* input line counter */
- int lastline; /* line of last token `consumed' */
- Token t; /* current token */
- Token lookahead; /* look ahead token */
- struct FuncState *fs; /* `FuncState' is private to the parser */
- struct lua_State *L;
- ZIO *z; /* input stream */
- Mbuffer *buff; /* buffer for tokens */
- TString *source; /* current source name */
- int nestlevel; /* level of nested non-terminals */
-} LexState;
-
-
-void luaX_init (lua_State *L);
-void luaX_setinput (lua_State *L, LexState *LS, ZIO *z, TString *source);
-int luaX_lex (LexState *LS, SemInfo *seminfo);
-void luaX_checklimit (LexState *ls, int val, int limit, const char *msg);
-void luaX_syntaxerror (LexState *ls, const char *s);
-void luaX_errorline (LexState *ls, const char *s, const char *token, int line);
-const char *luaX_token2str (LexState *ls, int token);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: llimits.h,v 1.52 2003/02/20 19:33:23 roberto Exp $
-** Limits, basic types, and some other `installation-dependent' definitions
-** See Copyright Notice in lua.h
-*/
-
-#ifndef llimits_h
-#define llimits_h
-
-
-#include <limits.h>
-#include <stddef.h>
-
-
-#include "lua.h"
-
-
-/*
-** try to find number of bits in an integer
-*/
-#ifndef BITS_INT
-/* avoid overflows in comparison */
-#if INT_MAX-20 < 32760
-#define BITS_INT 16
-#else
-#if INT_MAX > 2147483640L
-/* machine has at least 32 bits */
-#define BITS_INT 32
-#else
-#error "you must define BITS_INT with number of bits in an integer"
-#endif
-#endif
-#endif
-
-
-/*
-** the following types define integer types for values that may not
-** fit in a `small int' (16 bits), but may waste space in a
-** `large long' (64 bits). The current definitions should work in
-** any machine, but may not be optimal.
-*/
-
-/* an unsigned integer to hold hash values */
-typedef unsigned int lu_hash;
-/* its signed equivalent */
-typedef int ls_hash;
-
-/* an unsigned integer big enough to count the total memory used by Lua; */
-/* it should be at least as large as size_t */
-typedef unsigned long lu_mem;
-
-#define MAX_LUMEM ULONG_MAX
-
-
-/* an integer big enough to count the number of strings in use */
-typedef long ls_nstr;
-
-/* chars used as small naturals (so that `char' is reserved for characters) */
-typedef unsigned char lu_byte;
-
-
-#define MAX_SIZET ((size_t)(~(size_t)0)-2)
-
-
-#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
-
-/*
-** conversion of pointer to integer
-** this is for hashing only; there is no problem if the integer
-** cannot hold the whole pointer value
-*/
-#define IntPoint(p) ((lu_hash)(p))
-
-
-
-/* type to ensure maximum alignment */
-#ifndef LUSER_ALIGNMENT_T
-typedef union { double u; void *s; long l; } L_Umaxalign;
-#else
-typedef LUSER_ALIGNMENT_T L_Umaxalign;
-#endif
-
-
-/* result of `usual argument conversion' over lua_Number */
-#ifndef LUA_UACNUMBER
-typedef double l_uacNumber;
-#else
-typedef LUA_UACNUMBER l_uacNumber;
-#endif
-
-
-#ifndef lua_assert
-#define lua_assert(c) /* empty */
-#endif
-
-
-#ifndef check_exp
-#define check_exp(c,e) (e)
-#endif
-
-
-#ifndef UNUSED
-#define UNUSED(x) ((void)(x)) /* to avoid warnings */
-#endif
-
-
-#ifndef cast
-#define cast(t, exp) ((t)(exp))
-#endif
-
-
-
-/*
-** type for virtual-machine instructions
-** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
-*/
-typedef unsigned long Instruction;
-
-
-/* maximum depth for calls (unsigned short) */
-#ifndef LUA_MAXCALLS
-#define LUA_MAXCALLS 4096
-#endif
-
-
-/*
-** maximum depth for C calls (unsigned short): Not too big, or may
-** overflow the C stack...
-*/
-
-#ifndef LUA_MAXCCALLS
-#define LUA_MAXCCALLS 200
-#endif
-
-
-/* maximum size for the C stack */
-#ifndef LUA_MAXCSTACK
-#define LUA_MAXCSTACK 2048
-#endif
-
-
-/* maximum stack for a Lua function */
-#define MAXSTACK 250
-
-
-/* maximum number of variables declared in a function */
-#ifndef MAXVARS
-#define MAXVARS 200 /* arbitrary limit (<MAXSTACK) */
-#endif
-
-
-/* maximum number of upvalues per function */
-#ifndef MAXUPVALUES
-#define MAXUPVALUES 32
-#endif
-
-
-/* maximum number of parameters in a function */
-#ifndef MAXPARAMS
-#define MAXPARAMS 100 /* arbitrary limit (<MAXLOCALS) */
-#endif
-
-
-/* minimum size for the string table (must be power of 2) */
-#ifndef MINSTRTABSIZE
-#define MINSTRTABSIZE 32
-#endif
-
-
-/* minimum size for string buffer */
-#ifndef LUA_MINBUFFER
-#define LUA_MINBUFFER 32
-#endif
-
-
-/*
-** maximum number of syntactical nested non-terminals: Not too big,
-** or may overflow the C stack...
-*/
-#ifndef LUA_MAXPARSERLEVEL
-#define LUA_MAXPARSERLEVEL 200
-#endif
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lmem.c,v 1.61 2002/12/04 17:38:31 roberto Exp $
-** Interface to Memory Manager
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-
-#define lmem_c
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-
-
-
-/*
-** definition for realloc function. It must assure that l_realloc(NULL,
-** 0, x) allocates a new block (ANSI C assures that). (`os' is the old
-** block size; some allocators may use that.)
-*/
-#ifndef l_realloc
-#define l_realloc(b,os,s) realloc(b,s)
-#endif
-
-/*
-** definition for free function. (`os' is the old block size; some
-** allocators may use that.)
-*/
-#ifndef l_free
-#define l_free(b,os) free(b)
-#endif
-
-
-#define MINSIZEARRAY 4
-
-
-void *luaM_growaux (lua_State *L, void *block, int *size, int size_elems,
- int limit, const char *errormsg) {
- void *newblock;
- int newsize = (*size)*2;
- if (newsize < MINSIZEARRAY)
- newsize = MINSIZEARRAY; /* minimum size */
- else if (*size >= limit/2) { /* cannot double it? */
- if (*size < limit - MINSIZEARRAY) /* try something smaller... */
- newsize = limit; /* still have at least MINSIZEARRAY free places */
- else luaG_runerror(L, errormsg);
- }
- newblock = luaM_realloc(L, block,
- cast(lu_mem, *size)*cast(lu_mem, size_elems),
- cast(lu_mem, newsize)*cast(lu_mem, size_elems));
- *size = newsize; /* update only when everything else is OK */
- return newblock;
-}
-
-
-/*
-** generic allocation routine.
-*/
-void *luaM_realloc (lua_State *L, void *block, lu_mem oldsize, lu_mem size) {
- lua_assert((oldsize == 0) == (block == NULL));
- if (size == 0) {
- if (block != NULL) {
- l_free(block, oldsize);
- block = NULL;
- }
- else return NULL; /* avoid `nblocks' computations when oldsize==size==0 */
- }
- else if (size >= MAX_SIZET)
- luaG_runerror(L, "memory allocation error: block too big");
- else {
- block = l_realloc(block, oldsize, size);
- if (block == NULL) {
- if (L)
- luaD_throw(L, LUA_ERRMEM);
- else return NULL; /* error before creating state! */
- }
- }
- if (L) {
- lua_assert(G(L) != NULL && G(L)->nblocks > 0);
- G(L)->nblocks -= oldsize;
- G(L)->nblocks += size;
- }
- return block;
-}
-
+++ /dev/null
-/*
-** $Id: lmem.h,v 1.26 2002/05/01 20:40:42 roberto Exp $
-** Interface to Memory Manager
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lmem_h
-#define lmem_h
-
-
-#include <stddef.h>
-
-#include "llimits.h"
-#include "lua.h"
-
-#define MEMERRMSG "not enough memory"
-
-
-void *luaM_realloc (lua_State *L, void *oldblock, lu_mem oldsize, lu_mem size);
-
-void *luaM_growaux (lua_State *L, void *block, int *size, int size_elem,
- int limit, const char *errormsg);
-
-#define luaM_free(L, b, s) luaM_realloc(L, (b), (s), 0)
-#define luaM_freelem(L, b) luaM_realloc(L, (b), sizeof(*(b)), 0)
-#define luaM_freearray(L, b, n, t) luaM_realloc(L, (b), \
- cast(lu_mem, n)*cast(lu_mem, sizeof(t)), 0)
-
-#define luaM_malloc(L, t) luaM_realloc(L, NULL, 0, (t))
-#define luaM_new(L, t) cast(t *, luaM_malloc(L, sizeof(t)))
-#define luaM_newvector(L, n,t) cast(t *, luaM_malloc(L, \
- cast(lu_mem, n)*cast(lu_mem, sizeof(t))))
-
-#define luaM_growvector(L,v,nelems,size,t,limit,e) \
- if (((nelems)+1) > (size)) \
- ((v)=cast(t *, luaM_growaux(L,v,&(size),sizeof(t),limit,e)))
-
-#define luaM_reallocvector(L, v,oldn,n,t) \
- ((v)=cast(t *, luaM_realloc(L, v,cast(lu_mem, oldn)*cast(lu_mem, sizeof(t)), \
- cast(lu_mem, n)*cast(lu_mem, sizeof(t)))))
-
-
-#endif
-
+++ /dev/null
-/*
-** $Id: lobject.c,v 1.97 2003/04/03 13:35:34 roberto Exp $
-** Some generic functions over Lua objects
-** See Copyright Notice in lua.h
-*/
-
-#include <ctype.h>
-#include <stdarg.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lobject_c
-
-#include "lua.h"
-
-#include "ldo.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "lvm.h"
-
-
-/* function to convert a string to a lua_Number */
-#ifndef lua_str2number
-#define lua_str2number(s,p) strtod((s), (p))
-#endif
-
-
-const TObject luaO_nilobject = {LUA_TNIL, {NULL}};
-
-
-/*
-** converts an integer to a "floating point byte", represented as
-** (mmmmmxxx), where the real value is (xxx) * 2^(mmmmm)
-*/
-int luaO_int2fb (unsigned int x) {
- int m = 0; /* mantissa */
- while (x >= (1<<3)) {
- x = (x+1) >> 1;
- m++;
- }
- return (m << 3) | cast(int, x);
-}
-
-
-int luaO_log2 (unsigned int x) {
- static const lu_byte log_8[255] = {
- 0,
- 1,1,
- 2,2,2,2,
- 3,3,3,3,3,3,3,3,
- 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
- 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
- 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
- 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
- };
- if (x >= 0x00010000) {
- if (x >= 0x01000000) return log_8[((x>>24) & 0xff) - 1]+24;
- else return log_8[((x>>16) & 0xff) - 1]+16;
- }
- else {
- if (x >= 0x00000100) return log_8[((x>>8) & 0xff) - 1]+8;
- else if (x) return log_8[(x & 0xff) - 1];
- return -1; /* special `log' for 0 */
- }
-}
-
-
-int luaO_rawequalObj (const TObject *t1, const TObject *t2) {
- if (ttype(t1) != ttype(t2)) return 0;
- else switch (ttype(t1)) {
- case LUA_TNIL:
- return 1;
- case LUA_TNUMBER:
- return nvalue(t1) == nvalue(t2);
- case LUA_TBOOLEAN:
- return bvalue(t1) == bvalue(t2); /* boolean true must be 1 !! */
- case LUA_TLIGHTUSERDATA:
- return pvalue(t1) == pvalue(t2);
- default:
- lua_assert(iscollectable(t1));
- return gcvalue(t1) == gcvalue(t2);
- }
-}
-
-
-int luaO_str2d (const char *s, lua_Number *result) {
- char *endptr;
- lua_Number res = lua_str2number(s, &endptr);
- if (endptr == s) return 0; /* no conversion */
- while (isspace((unsigned char)(*endptr))) endptr++;
- if (*endptr != '\0') return 0; /* invalid trailing characters? */
- *result = res;
- return 1;
-}
-
-
-
-static void pushstr (lua_State *L, const char *str) {
- setsvalue2s(L->top, luaS_new(L, str));
- incr_top(L);
-}
-
-
-/* this function handles only `%d', `%c', %f, and `%s' formats */
-const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
- int n = 1;
- pushstr(L, "");
- for (;;) {
- const char *e = strchr(fmt, '%');
- if (e == NULL) break;
- setsvalue2s(L->top, luaS_newlstr(L, fmt, e-fmt));
- incr_top(L);
- switch (*(e+1)) {
- case 's':
- pushstr(L, va_arg(argp, char *));
- break;
- case 'c': {
- char buff[2];
- buff[0] = cast(char, va_arg(argp, int));
- buff[1] = '\0';
- pushstr(L, buff);
- break;
- }
- case 'd':
- setnvalue(L->top, cast(lua_Number, va_arg(argp, int)));
- incr_top(L);
- break;
- case 'f':
- setnvalue(L->top, cast(lua_Number, va_arg(argp, l_uacNumber)));
- incr_top(L);
- break;
- case '%':
- pushstr(L, "%");
- break;
- default: lua_assert(0);
- }
- n += 2;
- fmt = e+2;
- }
- pushstr(L, fmt);
- luaV_concat(L, n+1, L->top - L->base - 1);
- L->top -= n;
- return svalue(L->top - 1);
-}
-
-
-const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
- const char *msg;
- va_list argp;
- va_start(argp, fmt);
- msg = luaO_pushvfstring(L, fmt, argp);
- va_end(argp);
- return msg;
-}
-
-
-void luaO_chunkid (char *out, const char *source, int bufflen) {
- if (*source == '=') {
- strncpy(out, source+1, bufflen); /* remove first char */
- out[bufflen-1] = '\0'; /* ensures null termination */
- }
- else { /* out = "source", or "...source" */
- if (*source == '@') {
- int l;
- source++; /* skip the `@' */
- bufflen -= sizeof(" `...' ");
- l = strlen(source);
- strcpy(out, "");
- if (l>bufflen) {
- source += (l-bufflen); /* get last part of file name */
- strcat(out, "...");
- }
- strcat(out, source);
- }
- else { /* out = [string "string"] */
- int len = strcspn(source, "\n"); /* stop at first newline */
- bufflen -= sizeof(" [string \"...\"] ");
- if (len > bufflen) len = bufflen;
- strcpy(out, "[string \"");
- if (source[len] != '\0') { /* must truncate? */
- strncat(out, source, len);
- strcat(out, "...");
- }
- else
- strcat(out, source);
- strcat(out, "\"]");
- }
- }
-}
+++ /dev/null
-/*
-** $Id: lobject.h,v 1.159 2003/03/18 12:50:04 roberto Exp $
-** Type definitions for Lua objects
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lobject_h
-#define lobject_h
-
-
-#include "llimits.h"
-#include "lua.h"
-
-
-/* tags for values visible from Lua */
-#define NUM_TAGS LUA_TTHREAD
-
-
-/*
-** Extra tags for non-values
-*/
-#define LUA_TPROTO (NUM_TAGS+1)
-#define LUA_TUPVAL (NUM_TAGS+2)
-
-
-/*
-** Union of all collectable objects
-*/
-typedef union GCObject GCObject;
-
-
-/*
-** Common Header for all collectable objects (in macro form, to be
-** included in other objects)
-*/
-#define CommonHeader GCObject *next; lu_byte tt; lu_byte marked
-
-
-/*
-** Common header in struct form
-*/
-typedef struct GCheader {
- CommonHeader;
-} GCheader;
-
-
-
-
-/*
-** Union of all Lua values
-*/
-typedef union {
- GCObject *gc;
- void *p;
- lua_Number n;
- int b;
-} Value;
-
-
-/*
-** Lua values (or `tagged objects')
-*/
-typedef struct lua_TObject {
- int tt;
- Value value;
-} TObject;
-
-
-/* Macros to test type */
-#define ttisnil(o) (ttype(o) == LUA_TNIL)
-#define ttisnumber(o) (ttype(o) == LUA_TNUMBER)
-#define ttisstring(o) (ttype(o) == LUA_TSTRING)
-#define ttistable(o) (ttype(o) == LUA_TTABLE)
-#define ttisfunction(o) (ttype(o) == LUA_TFUNCTION)
-#define ttisboolean(o) (ttype(o) == LUA_TBOOLEAN)
-#define ttisuserdata(o) (ttype(o) == LUA_TUSERDATA)
-#define ttisthread(o) (ttype(o) == LUA_TTHREAD)
-#define ttislightuserdata(o) (ttype(o) == LUA_TLIGHTUSERDATA)
-
-/* Macros to access values */
-#define ttype(o) ((o)->tt)
-#define gcvalue(o) check_exp(iscollectable(o), (o)->value.gc)
-#define pvalue(o) check_exp(ttislightuserdata(o), (o)->value.p)
-#define nvalue(o) check_exp(ttisnumber(o), (o)->value.n)
-#define tsvalue(o) check_exp(ttisstring(o), &(o)->value.gc->ts)
-#define uvalue(o) check_exp(ttisuserdata(o), &(o)->value.gc->u)
-#define clvalue(o) check_exp(ttisfunction(o), &(o)->value.gc->cl)
-#define hvalue(o) check_exp(ttistable(o), &(o)->value.gc->h)
-#define bvalue(o) check_exp(ttisboolean(o), (o)->value.b)
-#define thvalue(o) check_exp(ttisthread(o), &(o)->value.gc->th)
-
-#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
-
-/* Macros to set values */
-#define setnvalue(obj,x) \
- { TObject *i_o=(obj); i_o->tt=LUA_TNUMBER; i_o->value.n=(x); }
-
-#define chgnvalue(obj,x) \
- check_exp(ttype(obj)==LUA_TNUMBER, (obj)->value.n=(x))
-
-#define setpvalue(obj,x) \
- { TObject *i_o=(obj); i_o->tt=LUA_TLIGHTUSERDATA; i_o->value.p=(x); }
-
-#define setbvalue(obj,x) \
- { TObject *i_o=(obj); i_o->tt=LUA_TBOOLEAN; i_o->value.b=(x); }
-
-#define setsvalue(obj,x) \
- { TObject *i_o=(obj); i_o->tt=LUA_TSTRING; \
- i_o->value.gc=cast(GCObject *, (x)); \
- lua_assert(i_o->value.gc->gch.tt == LUA_TSTRING); }
-
-#define setuvalue(obj,x) \
- { TObject *i_o=(obj); i_o->tt=LUA_TUSERDATA; \
- i_o->value.gc=cast(GCObject *, (x)); \
- lua_assert(i_o->value.gc->gch.tt == LUA_TUSERDATA); }
-
-#define setthvalue(obj,x) \
- { TObject *i_o=(obj); i_o->tt=LUA_TTHREAD; \
- i_o->value.gc=cast(GCObject *, (x)); \
- lua_assert(i_o->value.gc->gch.tt == LUA_TTHREAD); }
-
-#define setclvalue(obj,x) \
- { TObject *i_o=(obj); i_o->tt=LUA_TFUNCTION; \
- i_o->value.gc=cast(GCObject *, (x)); \
- lua_assert(i_o->value.gc->gch.tt == LUA_TFUNCTION); }
-
-#define sethvalue(obj,x) \
- { TObject *i_o=(obj); i_o->tt=LUA_TTABLE; \
- i_o->value.gc=cast(GCObject *, (x)); \
- lua_assert(i_o->value.gc->gch.tt == LUA_TTABLE); }
-
-#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
-
-
-
-/*
-** for internal debug only
-*/
-#define checkconsistency(obj) \
- lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))
-
-
-#define setobj(obj1,obj2) \
- { const TObject *o2=(obj2); TObject *o1=(obj1); \
- checkconsistency(o2); \
- o1->tt=o2->tt; o1->value = o2->value; }
-
-
-/*
-** different types of sets, according to destination
-*/
-
-/* from stack to (same) stack */
-#define setobjs2s setobj
-/* to stack (not from same stack) */
-#define setobj2s setobj
-#define setsvalue2s setsvalue
-/* from table to same table */
-#define setobjt2t setobj
-/* to table */
-#define setobj2t setobj
-/* to new object */
-#define setobj2n setobj
-#define setsvalue2n setsvalue
-
-#define setttype(obj, tt) (ttype(obj) = (tt))
-
-
-#define iscollectable(o) (ttype(o) >= LUA_TSTRING)
-
-
-
-typedef TObject *StkId; /* index to stack elements */
-
-
-/*
-** String headers for string table
-*/
-typedef union TString {
- L_Umaxalign dummy; /* ensures maximum alignment for strings */
- struct {
- CommonHeader;
- lu_byte reserved;
- lu_hash hash;
- size_t len;
- } tsv;
-} TString;
-
-
-#define getstr(ts) cast(const char *, (ts) + 1)
-#define svalue(o) getstr(tsvalue(o))
-
-
-
-typedef union Udata {
- L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */
- struct {
- CommonHeader;
- struct Table *metatable;
- size_t len;
- } uv;
-} Udata;
-
-
-
-
-/*
-** Function Prototypes
-*/
-typedef struct Proto {
- CommonHeader;
- TObject *k; /* constants used by the function */
- Instruction *code;
- struct Proto **p; /* functions defined inside the function */
- int *lineinfo; /* map from opcodes to source lines */
- struct LocVar *locvars; /* information about local variables */
- TString **upvalues; /* upvalue names */
- TString *source;
- int sizeupvalues;
- int sizek; /* size of `k' */
- int sizecode;
- int sizelineinfo;
- int sizep; /* size of `p' */
- int sizelocvars;
- int lineDefined;
- GCObject *gclist;
- lu_byte nups; /* number of upvalues */
- lu_byte numparams;
- lu_byte is_vararg;
- lu_byte maxstacksize;
-} Proto;
-
-
-typedef struct LocVar {
- TString *varname;
- int startpc; /* first point where variable is active */
- int endpc; /* first point where variable is dead */
-} LocVar;
-
-
-
-/*
-** Upvalues
-*/
-
-typedef struct UpVal {
- CommonHeader;
- TObject *v; /* points to stack or to its own value */
- TObject value; /* the value (when closed) */
-} UpVal;
-
-
-/*
-** Closures
-*/
-
-#define ClosureHeader \
- CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist
-
-typedef struct CClosure {
- ClosureHeader;
- lua_CFunction f;
- TObject upvalue[1];
-} CClosure;
-
-
-typedef struct LClosure {
- ClosureHeader;
- struct Proto *p;
- TObject g; /* global table for this closure */
- UpVal *upvals[1];
-} LClosure;
-
-
-typedef union Closure {
- CClosure c;
- LClosure l;
-} Closure;
-
-
-#define iscfunction(o) (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
-#define isLfunction(o) (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)
-
-
-/*
-** Tables
-*/
-
-typedef struct Node {
- TObject i_key;
- TObject i_val;
- struct Node *next; /* for chaining */
-} Node;
-
-
-typedef struct Table {
- CommonHeader;
- lu_byte flags; /* 1<<p means tagmethod(p) is not present */
- lu_byte lsizenode; /* log2 of size of `node' array */
- struct Table *metatable;
- TObject *array; /* array part */
- Node *node;
- Node *firstfree; /* this position is free; all positions after it are full */
- GCObject *gclist;
- int sizearray; /* size of `array' array */
-} Table;
-
-
-
-/*
-** `module' operation for hashing (size is always a power of 2)
-*/
-#define lmod(s,size) \
- check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1))))
-
-
-#define twoto(x) (1<<(x))
-#define sizenode(t) (twoto((t)->lsizenode))
-
-
-
-extern const TObject luaO_nilobject;
-
-int luaO_log2 (unsigned int x);
-int luaO_int2fb (unsigned int x);
-#define fb2int(x) (((x) & 7) << ((x) >> 3))
-
-int luaO_rawequalObj (const TObject *t1, const TObject *t2);
-int luaO_str2d (const char *s, lua_Number *result);
-
-const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp);
-const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
-void luaO_chunkid (char *out, const char *source, int len);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lopcodes.c,v 1.22 2002/12/04 17:38:31 roberto Exp $
-** extracted automatically from lopcodes.h by mkprint.lua
-** DO NOT EDIT
-** See Copyright Notice in lua.h
-*/
-
-
-#define lopcodes_c
-
-#include "lua.h"
-
-#include "lobject.h"
-#include "lopcodes.h"
-
-
-#ifdef LUA_OPNAMES
-
-const char *const luaP_opnames[] = {
- "MOVE",
- "LOADK",
- "LOADBOOL",
- "LOADNIL",
- "GETUPVAL",
- "GETGLOBAL",
- "GETTABLE",
- "SETGLOBAL",
- "SETUPVAL",
- "SETTABLE",
- "NEWTABLE",
- "SELF",
- "ADD",
- "SUB",
- "MUL",
- "DIV",
- "POW",
- "UNM",
- "NOT",
- "CONCAT",
- "JMP",
- "EQ",
- "LT",
- "LE",
- "TEST",
- "CALL",
- "TAILCALL",
- "RETURN",
- "FORLOOP",
- "TFORLOOP",
- "TFORPREP",
- "SETLIST",
- "SETLISTO",
- "CLOSE",
- "CLOSURE"
-};
-
-#endif
-
-#define opmode(t,b,bk,ck,sa,k,m) (((t)<<OpModeT) | \
- ((b)<<OpModeBreg) | ((bk)<<OpModeBrk) | ((ck)<<OpModeCrk) | \
- ((sa)<<OpModesetA) | ((k)<<OpModeK) | (m))
-
-
-const lu_byte luaP_opmodes[NUM_OPCODES] = {
-/* T B Bk Ck sA K mode opcode */
- opmode(0, 1, 0, 0, 1, 0, iABC) /* OP_MOVE */
- ,opmode(0, 0, 0, 0, 1, 1, iABx) /* OP_LOADK */
- ,opmode(0, 0, 0, 0, 1, 0, iABC) /* OP_LOADBOOL */
- ,opmode(0, 1, 0, 0, 1, 0, iABC) /* OP_LOADNIL */
- ,opmode(0, 0, 0, 0, 1, 0, iABC) /* OP_GETUPVAL */
- ,opmode(0, 0, 0, 0, 1, 1, iABx) /* OP_GETGLOBAL */
- ,opmode(0, 1, 0, 1, 1, 0, iABC) /* OP_GETTABLE */
- ,opmode(0, 0, 0, 0, 0, 1, iABx) /* OP_SETGLOBAL */
- ,opmode(0, 0, 0, 0, 0, 0, iABC) /* OP_SETUPVAL */
- ,opmode(0, 0, 1, 1, 0, 0, iABC) /* OP_SETTABLE */
- ,opmode(0, 0, 0, 0, 1, 0, iABC) /* OP_NEWTABLE */
- ,opmode(0, 1, 0, 1, 1, 0, iABC) /* OP_SELF */
- ,opmode(0, 0, 1, 1, 1, 0, iABC) /* OP_ADD */
- ,opmode(0, 0, 1, 1, 1, 0, iABC) /* OP_SUB */
- ,opmode(0, 0, 1, 1, 1, 0, iABC) /* OP_MUL */
- ,opmode(0, 0, 1, 1, 1, 0, iABC) /* OP_DIV */
- ,opmode(0, 0, 1, 1, 1, 0, iABC) /* OP_POW */
- ,opmode(0, 1, 0, 0, 1, 0, iABC) /* OP_UNM */
- ,opmode(0, 1, 0, 0, 1, 0, iABC) /* OP_NOT */
- ,opmode(0, 1, 0, 1, 1, 0, iABC) /* OP_CONCAT */
- ,opmode(0, 0, 0, 0, 0, 0, iAsBx) /* OP_JMP */
- ,opmode(1, 0, 1, 1, 0, 0, iABC) /* OP_EQ */
- ,opmode(1, 0, 1, 1, 0, 0, iABC) /* OP_LT */
- ,opmode(1, 0, 1, 1, 0, 0, iABC) /* OP_LE */
- ,opmode(1, 1, 0, 0, 1, 0, iABC) /* OP_TEST */
- ,opmode(0, 0, 0, 0, 0, 0, iABC) /* OP_CALL */
- ,opmode(0, 0, 0, 0, 0, 0, iABC) /* OP_TAILCALL */
- ,opmode(0, 0, 0, 0, 0, 0, iABC) /* OP_RETURN */
- ,opmode(0, 0, 0, 0, 0, 0, iAsBx) /* OP_FORLOOP */
- ,opmode(1, 0, 0, 0, 0, 0, iABC) /* OP_TFORLOOP */
- ,opmode(0, 0, 0, 0, 0, 0, iAsBx) /* OP_TFORPREP */
- ,opmode(0, 0, 0, 0, 0, 0, iABx) /* OP_SETLIST */
- ,opmode(0, 0, 0, 0, 0, 0, iABx) /* OP_SETLISTO */
- ,opmode(0, 0, 0, 0, 0, 0, iABC) /* OP_CLOSE */
- ,opmode(0, 0, 0, 0, 1, 0, iABx) /* OP_CLOSURE */
-};
-
+++ /dev/null
-/*
-** $Id: lopcodes.h,v 1.102 2002/08/21 18:56:09 roberto Exp $
-** Opcodes for Lua virtual machine
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lopcodes_h
-#define lopcodes_h
-
-#include "llimits.h"
-
-
-/*===========================================================================
- We assume that instructions are unsigned numbers.
- All instructions have an opcode in the first 6 bits.
- Instructions can have the following fields:
- `A' : 8 bits
- `B' : 9 bits
- `C' : 9 bits
- `Bx' : 18 bits (`B' and `C' together)
- `sBx' : signed Bx
-
- A signed argument is represented in excess K; that is, the number
- value is the unsigned value minus K. K is exactly the maximum value
- for that argument (so that -max is represented by 0, and +max is
- represented by 2*max), which is half the maximum for the corresponding
- unsigned argument.
-===========================================================================*/
-
-
-enum OpMode {iABC, iABx, iAsBx}; /* basic instruction format */
-
-
-/*
-** size and position of opcode arguments.
-*/
-#define SIZE_C 9
-#define SIZE_B 9
-#define SIZE_Bx (SIZE_C + SIZE_B)
-#define SIZE_A 8
-
-#define SIZE_OP 6
-
-#define POS_C SIZE_OP
-#define POS_B (POS_C + SIZE_C)
-#define POS_Bx POS_C
-#define POS_A (POS_B + SIZE_B)
-
-
-/*
-** limits for opcode arguments.
-** we use (signed) int to manipulate most arguments,
-** so they must fit in BITS_INT-1 bits (-1 for sign)
-*/
-#if SIZE_Bx < BITS_INT-1
-#define MAXARG_Bx ((1<<SIZE_Bx)-1)
-#define MAXARG_sBx (MAXARG_Bx>>1) /* `sBx' is signed */
-#else
-#define MAXARG_Bx MAX_INT
-#define MAXARG_sBx MAX_INT
-#endif
-
-
-#define MAXARG_A ((1<<SIZE_A)-1)
-#define MAXARG_B ((1<<SIZE_B)-1)
-#define MAXARG_C ((1<<SIZE_C)-1)
-
-
-/* creates a mask with `n' 1 bits at position `p' */
-#define MASK1(n,p) ((~((~(Instruction)0)<<n))<<p)
-
-/* creates a mask with `n' 0 bits at position `p' */
-#define MASK0(n,p) (~MASK1(n,p))
-
-/*
-** the following macros help to manipulate instructions
-*/
-
-#define GET_OPCODE(i) (cast(OpCode, (i)&MASK1(SIZE_OP,0)))
-#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,0)) | cast(Instruction, o)))
-
-#define GETARG_A(i) (cast(int, (i)>>POS_A))
-#define SETARG_A(i,u) ((i) = (((i)&MASK0(SIZE_A,POS_A)) | \
- ((cast(Instruction, u)<<POS_A)&MASK1(SIZE_A,POS_A))))
-
-#define GETARG_B(i) (cast(int, ((i)>>POS_B) & MASK1(SIZE_B,0)))
-#define SETARG_B(i,b) ((i) = (((i)&MASK0(SIZE_B,POS_B)) | \
- ((cast(Instruction, b)<<POS_B)&MASK1(SIZE_B,POS_B))))
-
-#define GETARG_C(i) (cast(int, ((i)>>POS_C) & MASK1(SIZE_C,0)))
-#define SETARG_C(i,b) ((i) = (((i)&MASK0(SIZE_C,POS_C)) | \
- ((cast(Instruction, b)<<POS_C)&MASK1(SIZE_C,POS_C))))
-
-#define GETARG_Bx(i) (cast(int, ((i)>>POS_Bx) & MASK1(SIZE_Bx,0)))
-#define SETARG_Bx(i,b) ((i) = (((i)&MASK0(SIZE_Bx,POS_Bx)) | \
- ((cast(Instruction, b)<<POS_Bx)&MASK1(SIZE_Bx,POS_Bx))))
-
-#define GETARG_sBx(i) (GETARG_Bx(i)-MAXARG_sBx)
-#define SETARG_sBx(i,b) SETARG_Bx((i),cast(unsigned int, (b)+MAXARG_sBx))
-
-
-#define CREATE_ABC(o,a,b,c) (cast(Instruction, o) \
- | (cast(Instruction, a)<<POS_A) \
- | (cast(Instruction, b)<<POS_B) \
- | (cast(Instruction, c)<<POS_C))
-
-#define CREATE_ABx(o,a,bc) (cast(Instruction, o) \
- | (cast(Instruction, a)<<POS_A) \
- | (cast(Instruction, bc)<<POS_Bx))
-
-
-
-
-/*
-** invalid register that fits in 8 bits
-*/
-#define NO_REG MAXARG_A
-
-
-/*
-** R(x) - register
-** Kst(x) - constant (in constant table)
-** RK(x) == if x < MAXSTACK then R(x) else Kst(x-MAXSTACK)
-*/
-
-
-/*
-** grep "ORDER OP" if you change these enums
-*/
-
-typedef enum {
-/*----------------------------------------------------------------------
-name args description
-------------------------------------------------------------------------*/
-OP_MOVE,/* A B R(A) := R(B) */
-OP_LOADK,/* A Bx R(A) := Kst(Bx) */
-OP_LOADBOOL,/* A B C R(A) := (Bool)B; if (C) PC++ */
-OP_LOADNIL,/* A B R(A) := ... := R(B) := nil */
-OP_GETUPVAL,/* A B R(A) := UpValue[B] */
-
-OP_GETGLOBAL,/* A Bx R(A) := Gbl[Kst(Bx)] */
-OP_GETTABLE,/* A B C R(A) := R(B)[RK(C)] */
-
-OP_SETGLOBAL,/* A Bx Gbl[Kst(Bx)] := R(A) */
-OP_SETUPVAL,/* A B UpValue[B] := R(A) */
-OP_SETTABLE,/* A B C R(A)[RK(B)] := RK(C) */
-
-OP_NEWTABLE,/* A B C R(A) := {} (size = B,C) */
-
-OP_SELF,/* A B C R(A+1) := R(B); R(A) := R(B)[RK(C)] */
-
-OP_ADD,/* A B C R(A) := RK(B) + RK(C) */
-OP_SUB,/* A B C R(A) := RK(B) - RK(C) */
-OP_MUL,/* A B C R(A) := RK(B) * RK(C) */
-OP_DIV,/* A B C R(A) := RK(B) / RK(C) */
-OP_POW,/* A B C R(A) := RK(B) ^ RK(C) */
-OP_UNM,/* A B R(A) := -R(B) */
-OP_NOT,/* A B R(A) := not R(B) */
-
-OP_CONCAT,/* A B C R(A) := R(B).. ... ..R(C) */
-
-OP_JMP,/* sBx PC += sBx */
-
-OP_EQ,/* A B C if ((RK(B) == RK(C)) ~= A) then pc++ */
-OP_LT,/* A B C if ((RK(B) < RK(C)) ~= A) then pc++ */
-OP_LE,/* A B C if ((RK(B) <= RK(C)) ~= A) then pc++ */
-
-OP_TEST,/* A B C if (R(B) <=> C) then R(A) := R(B) else pc++ */
-
-OP_CALL,/* A B C R(A), ... ,R(A+C-2) := R(A)(R(A+1), ... ,R(A+B-1)) */
-OP_TAILCALL,/* A B C return R(A)(R(A+1), ... ,R(A+B-1)) */
-OP_RETURN,/* A B return R(A), ... ,R(A+B-2) (see note) */
-
-OP_FORLOOP,/* A sBx R(A)+=R(A+2); if R(A) <?= R(A+1) then PC+= sBx */
-
-OP_TFORLOOP,/* A C R(A+2), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2));
- if R(A+2) ~= nil then pc++ */
-OP_TFORPREP,/* A sBx if type(R(A)) == table then R(A+1):=R(A), R(A):=next;
- PC += sBx */
-
-OP_SETLIST,/* A Bx R(A)[Bx-Bx%FPF+i] := R(A+i), 1 <= i <= Bx%FPF+1 */
-OP_SETLISTO,/* A Bx */
-
-OP_CLOSE,/* A close all variables in the stack up to (>=) R(A)*/
-OP_CLOSURE/* A Bx R(A) := closure(KPROTO[Bx], R(A), ... ,R(A+n)) */
-} OpCode;
-
-
-#define NUM_OPCODES (cast(int, OP_CLOSURE+1))
-
-
-
-/*===========================================================================
- Notes:
- (1) In OP_CALL, if (B == 0) then B = top. C is the number of returns - 1,
- and can be 0: OP_CALL then sets `top' to last_result+1, so
- next open instruction (OP_CALL, OP_RETURN, OP_SETLIST) may use `top'.
-
- (2) In OP_RETURN, if (B == 0) then return up to `top'
-
- (3) For comparisons, B specifies what conditions the test should accept.
-
- (4) All `skips' (pc++) assume that next instruction is a jump
-===========================================================================*/
-
-
-/*
-** masks for instruction properties
-*/
-enum OpModeMask {
- OpModeBreg = 2, /* B is a register */
- OpModeBrk, /* B is a register/constant */
- OpModeCrk, /* C is a register/constant */
- OpModesetA, /* instruction set register A */
- OpModeK, /* Bx is a constant */
- OpModeT /* operator is a test */
-
-};
-
-
-extern const lu_byte luaP_opmodes[NUM_OPCODES];
-
-#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 3))
-#define testOpMode(m, b) (luaP_opmodes[m] & (1 << (b)))
-
-
-#ifdef LUA_OPNAMES
-extern const char *const luaP_opnames[]; /* opcode names */
-#endif
-
-
-
-/* number of list items to accumulate before a SETLIST instruction */
-/* (must be a power of 2) */
-#define LFIELDS_PER_FLUSH 32
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lparser.c,v 1.208a 2003/04/03 13:35:34 roberto Exp $
-** Lua Parser
-** See Copyright Notice in lua.h
-*/
-
-
-#include <string.h>
-
-#define lparser_c
-
-#include "lua.h"
-
-#include "lcode.h"
-#include "ldebug.h"
-#include "lfunc.h"
-#include "llex.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lparser.h"
-#include "lstate.h"
-#include "lstring.h"
-
-
-
-
-#define getlocvar(fs, i) ((fs)->f->locvars[(fs)->actvar[i]])
-
-
-#define enterlevel(ls) if (++(ls)->nestlevel > LUA_MAXPARSERLEVEL) \
- luaX_syntaxerror(ls, "too many syntax levels");
-#define leavelevel(ls) ((ls)->nestlevel--)
-
-
-/*
-** nodes for block list (list of active blocks)
-*/
-typedef struct BlockCnt {
- struct BlockCnt *previous; /* chain */
- int breaklist; /* list of jumps out of this loop */
- int nactvar; /* # active local variables outside the breakable structure */
- int upval; /* true if some variable in the block is an upvalue */
- int isbreakable; /* true if `block' is a loop */
-} BlockCnt;
-
-
-
-/*
-** prototypes for recursive non-terminal functions
-*/
-static void chunk (LexState *ls);
-static void expr (LexState *ls, expdesc *v);
-
-
-
-static void next (LexState *ls) {
- ls->lastline = ls->linenumber;
- if (ls->lookahead.token != TK_EOS) { /* is there a look-ahead token? */
- ls->t = ls->lookahead; /* use this one */
- ls->lookahead.token = TK_EOS; /* and discharge it */
- }
- else
- ls->t.token = luaX_lex(ls, &ls->t.seminfo); /* read next token */
-}
-
-
-static void lookahead (LexState *ls) {
- lua_assert(ls->lookahead.token == TK_EOS);
- ls->lookahead.token = luaX_lex(ls, &ls->lookahead.seminfo);
-}
-
-
-static void error_expected (LexState *ls, int token) {
- luaX_syntaxerror(ls,
- luaO_pushfstring(ls->L, "`%s' expected", luaX_token2str(ls, token)));
-}
-
-
-static int testnext (LexState *ls, int c) {
- if (ls->t.token == c) {
- next(ls);
- return 1;
- }
- else return 0;
-}
-
-
-static void check (LexState *ls, int c) {
- if (!testnext(ls, c))
- error_expected(ls, c);
-}
-
-
-#define check_condition(ls,c,msg) { if (!(c)) luaX_syntaxerror(ls, msg); }
-
-
-
-static void check_match (LexState *ls, int what, int who, int where) {
- if (!testnext(ls, what)) {
- if (where == ls->linenumber)
- error_expected(ls, what);
- else {
- luaX_syntaxerror(ls, luaO_pushfstring(ls->L,
- "`%s' expected (to close `%s' at line %d)",
- luaX_token2str(ls, what), luaX_token2str(ls, who), where));
- }
- }
-}
-
-
-static TString *str_checkname (LexState *ls) {
- TString *ts;
- check_condition(ls, (ls->t.token == TK_NAME), "<name> expected");
- ts = ls->t.seminfo.ts;
- next(ls);
- return ts;
-}
-
-
-static void init_exp (expdesc *e, expkind k, int i) {
- e->f = e->t = NO_JUMP;
- e->k = k;
- e->info = i;
-}
-
-
-static void codestring (LexState *ls, expdesc *e, TString *s) {
- init_exp(e, VK, luaK_stringK(ls->fs, s));
-}
-
-
-static void checkname(LexState *ls, expdesc *e) {
- codestring(ls, e, str_checkname(ls));
-}
-
-
-static int luaI_registerlocalvar (LexState *ls, TString *varname) {
- FuncState *fs = ls->fs;
- Proto *f = fs->f;
- luaM_growvector(ls->L, f->locvars, fs->nlocvars, f->sizelocvars,
- LocVar, MAX_INT, "");
- f->locvars[fs->nlocvars].varname = varname;
- return fs->nlocvars++;
-}
-
-
-static void new_localvar (LexState *ls, TString *name, int n) {
- FuncState *fs = ls->fs;
- luaX_checklimit(ls, fs->nactvar+n+1, MAXVARS, "local variables");
- fs->actvar[fs->nactvar+n] = luaI_registerlocalvar(ls, name);
-}
-
-
-static void adjustlocalvars (LexState *ls, int nvars) {
- FuncState *fs = ls->fs;
- fs->nactvar += nvars;
- for (; nvars; nvars--) {
- getlocvar(fs, fs->nactvar - nvars).startpc = fs->pc;
- }
-}
-
-
-static void removevars (LexState *ls, int tolevel) {
- FuncState *fs = ls->fs;
- while (fs->nactvar > tolevel)
- getlocvar(fs, --fs->nactvar).endpc = fs->pc;
-}
-
-
-static void new_localvarstr (LexState *ls, const char *name, int n) {
- new_localvar(ls, luaS_new(ls->L, name), n);
-}
-
-
-static void create_local (LexState *ls, const char *name) {
- new_localvarstr(ls, name, 0);
- adjustlocalvars(ls, 1);
-}
-
-
-static int indexupvalue (FuncState *fs, TString *name, expdesc *v) {
- int i;
- Proto *f = fs->f;
- for (i=0; i<f->nups; i++) {
- if (fs->upvalues[i].k == v->k && fs->upvalues[i].info == v->info) {
- lua_assert(fs->f->upvalues[i] == name);
- return i;
- }
- }
- /* new one */
- luaX_checklimit(fs->ls, f->nups + 1, MAXUPVALUES, "upvalues");
- luaM_growvector(fs->L, fs->f->upvalues, f->nups, fs->f->sizeupvalues,
- TString *, MAX_INT, "");
- fs->f->upvalues[f->nups] = name;
- fs->upvalues[f->nups] = *v;
- return f->nups++;
-}
-
-
-static int searchvar (FuncState *fs, TString *n) {
- int i;
- for (i=fs->nactvar-1; i >= 0; i--) {
- if (n == getlocvar(fs, i).varname)
- return i;
- }
- return -1; /* not found */
-}
-
-
-static void markupval (FuncState *fs, int level) {
- BlockCnt *bl = fs->bl;
- while (bl && bl->nactvar > level) bl = bl->previous;
- if (bl) bl->upval = 1;
-}
-
-
-static void singlevaraux (FuncState *fs, TString *n, expdesc *var, int base) {
- if (fs == NULL) /* no more levels? */
- init_exp(var, VGLOBAL, NO_REG); /* default is global variable */
- else {
- int v = searchvar(fs, n); /* look up at current level */
- if (v >= 0) {
- init_exp(var, VLOCAL, v);
- if (!base)
- markupval(fs, v); /* local will be used as an upval */
- }
- else { /* not found at current level; try upper one */
- singlevaraux(fs->prev, n, var, 0);
- if (var->k == VGLOBAL) {
- if (base)
- var->info = luaK_stringK(fs, n); /* info points to global name */
- }
- else { /* LOCAL or UPVAL */
- var->info = indexupvalue(fs, n, var);
- var->k = VUPVAL; /* upvalue in this level */
- }
- }
- }
-}
-
-
-static TString *singlevar (LexState *ls, expdesc *var, int base) {
- TString *varname = str_checkname(ls);
- singlevaraux(ls->fs, varname, var, base);
- return varname;
-}
-
-
-static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) {
- FuncState *fs = ls->fs;
- int extra = nvars - nexps;
- if (e->k == VCALL) {
- extra++; /* includes call itself */
- if (extra <= 0) extra = 0;
- else luaK_reserveregs(fs, extra-1);
- luaK_setcallreturns(fs, e, extra); /* call provides the difference */
- }
- else {
- if (e->k != VVOID) luaK_exp2nextreg(fs, e); /* close last expression */
- if (extra > 0) {
- int reg = fs->freereg;
- luaK_reserveregs(fs, extra);
- luaK_nil(fs, reg, extra);
- }
- }
-}
-
-
-static void code_params (LexState *ls, int nparams, int dots) {
- FuncState *fs = ls->fs;
- adjustlocalvars(ls, nparams);
- luaX_checklimit(ls, fs->nactvar, MAXPARAMS, "parameters");
- fs->f->numparams = cast(lu_byte, fs->nactvar);
- fs->f->is_vararg = cast(lu_byte, dots);
- if (dots)
- create_local(ls, "arg");
- luaK_reserveregs(fs, fs->nactvar); /* reserve register for parameters */
-}
-
-
-static void enterblock (FuncState *fs, BlockCnt *bl, int isbreakable) {
- bl->breaklist = NO_JUMP;
- bl->isbreakable = isbreakable;
- bl->nactvar = fs->nactvar;
- bl->upval = 0;
- bl->previous = fs->bl;
- fs->bl = bl;
- lua_assert(fs->freereg == fs->nactvar);
-}
-
-
-static void leaveblock (FuncState *fs) {
- BlockCnt *bl = fs->bl;
- fs->bl = bl->previous;
- removevars(fs->ls, bl->nactvar);
- if (bl->upval)
- luaK_codeABC(fs, OP_CLOSE, bl->nactvar, 0, 0);
- lua_assert(bl->nactvar == fs->nactvar);
- fs->freereg = fs->nactvar; /* free registers */
- luaK_patchtohere(fs, bl->breaklist);
-}
-
-
-static void pushclosure (LexState *ls, FuncState *func, expdesc *v) {
- FuncState *fs = ls->fs;
- Proto *f = fs->f;
- int i;
- luaM_growvector(ls->L, f->p, fs->np, f->sizep, Proto *,
- MAXARG_Bx, "constant table overflow");
- f->p[fs->np++] = func->f;
- init_exp(v, VRELOCABLE, luaK_codeABx(fs, OP_CLOSURE, 0, fs->np-1));
- for (i=0; i<func->f->nups; i++) {
- OpCode o = (func->upvalues[i].k == VLOCAL) ? OP_MOVE : OP_GETUPVAL;
- luaK_codeABC(fs, o, 0, func->upvalues[i].info, 0);
- }
-}
-
-
-static void open_func (LexState *ls, FuncState *fs) {
- Proto *f = luaF_newproto(ls->L);
- fs->f = f;
- fs->prev = ls->fs; /* linked list of funcstates */
- fs->ls = ls;
- fs->L = ls->L;
- ls->fs = fs;
- fs->pc = 0;
- fs->lasttarget = 0;
- fs->jpc = NO_JUMP;
- fs->freereg = 0;
- fs->nk = 0;
- fs->h = luaH_new(ls->L, 0, 0);
- fs->np = 0;
- fs->nlocvars = 0;
- fs->nactvar = 0;
- fs->bl = NULL;
- f->source = ls->source;
- f->maxstacksize = 2; /* registers 0/1 are always valid */
-}
-
-
-static void close_func (LexState *ls) {
- lua_State *L = ls->L;
- FuncState *fs = ls->fs;
- Proto *f = fs->f;
- removevars(ls, 0);
- luaK_codeABC(fs, OP_RETURN, 0, 1, 0); /* final return */
- luaM_reallocvector(L, f->code, f->sizecode, fs->pc, Instruction);
- f->sizecode = fs->pc;
- luaM_reallocvector(L, f->lineinfo, f->sizelineinfo, fs->pc, int);
- f->sizelineinfo = fs->pc;
- luaM_reallocvector(L, f->k, f->sizek, fs->nk, TObject);
- f->sizek = fs->nk;
- luaM_reallocvector(L, f->p, f->sizep, fs->np, Proto *);
- f->sizep = fs->np;
- luaM_reallocvector(L, f->locvars, f->sizelocvars, fs->nlocvars, LocVar);
- f->sizelocvars = fs->nlocvars;
- luaM_reallocvector(L, f->upvalues, f->sizeupvalues, f->nups, TString *);
- f->sizeupvalues = f->nups;
- lua_assert(luaG_checkcode(f));
- lua_assert(fs->bl == NULL);
- ls->fs = fs->prev;
-}
-
-
-Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff) {
- struct LexState lexstate;
- struct FuncState funcstate;
- lexstate.buff = buff;
- lexstate.nestlevel = 0;
- luaX_setinput(L, &lexstate, z, luaS_new(L, zname(z)));
- open_func(&lexstate, &funcstate);
- next(&lexstate); /* read first token */
- chunk(&lexstate);
- check_condition(&lexstate, (lexstate.t.token == TK_EOS), "<eof> expected");
- close_func(&lexstate);
- lua_assert(funcstate.prev == NULL);
- lua_assert(funcstate.f->nups == 0);
- lua_assert(lexstate.nestlevel == 0);
- return funcstate.f;
-}
-
-
-
-/*============================================================*/
-/* GRAMMAR RULES */
-/*============================================================*/
-
-
-static void luaY_field (LexState *ls, expdesc *v) {
- /* field -> ['.' | ':'] NAME */
- FuncState *fs = ls->fs;
- expdesc key;
- luaK_exp2anyreg(fs, v);
- next(ls); /* skip the dot or colon */
- checkname(ls, &key);
- luaK_indexed(fs, v, &key);
-}
-
-
-static void luaY_index (LexState *ls, expdesc *v) {
- /* index -> '[' expr ']' */
- next(ls); /* skip the '[' */
- expr(ls, v);
- luaK_exp2val(ls->fs, v);
- check(ls, ']');
-}
-
-
-/*
-** {======================================================================
-** Rules for Constructors
-** =======================================================================
-*/
-
-
-struct ConsControl {
- expdesc v; /* last list item read */
- expdesc *t; /* table descriptor */
- int nh; /* total number of `record' elements */
- int na; /* total number of array elements */
- int tostore; /* number of array elements pending to be stored */
-};
-
-
-static void recfield (LexState *ls, struct ConsControl *cc) {
- /* recfield -> (NAME | `['exp1`]') = exp1 */
- FuncState *fs = ls->fs;
- int reg = ls->fs->freereg;
- expdesc key, val;
- if (ls->t.token == TK_NAME) {
- luaX_checklimit(ls, cc->nh, MAX_INT, "items in a constructor");
- cc->nh++;
- checkname(ls, &key);
- }
- else /* ls->t.token == '[' */
- luaY_index(ls, &key);
- check(ls, '=');
- luaK_exp2RK(fs, &key);
- expr(ls, &val);
- luaK_codeABC(fs, OP_SETTABLE, cc->t->info, luaK_exp2RK(fs, &key),
- luaK_exp2RK(fs, &val));
- fs->freereg = reg; /* free registers */
-}
-
-
-static void closelistfield (FuncState *fs, struct ConsControl *cc) {
- if (cc->v.k == VVOID) return; /* there is no list item */
- luaK_exp2nextreg(fs, &cc->v);
- cc->v.k = VVOID;
- if (cc->tostore == LFIELDS_PER_FLUSH) {
- luaK_codeABx(fs, OP_SETLIST, cc->t->info, cc->na-1); /* flush */
- cc->tostore = 0; /* no more items pending */
- fs->freereg = cc->t->info + 1; /* free registers */
- }
-}
-
-
-static void lastlistfield (FuncState *fs, struct ConsControl *cc) {
- if (cc->tostore == 0) return;
- if (cc->v.k == VCALL) {
- luaK_setcallreturns(fs, &cc->v, LUA_MULTRET);
- luaK_codeABx(fs, OP_SETLISTO, cc->t->info, cc->na-1);
- }
- else {
- if (cc->v.k != VVOID)
- luaK_exp2nextreg(fs, &cc->v);
- luaK_codeABx(fs, OP_SETLIST, cc->t->info, cc->na-1);
- }
- fs->freereg = cc->t->info + 1; /* free registers */
-}
-
-
-static void listfield (LexState *ls, struct ConsControl *cc) {
- expr(ls, &cc->v);
- luaX_checklimit(ls, cc->na, MAXARG_Bx, "items in a constructor");
- cc->na++;
- cc->tostore++;
-}
-
-
-static void constructor (LexState *ls, expdesc *t) {
- /* constructor -> ?? */
- FuncState *fs = ls->fs;
- int line = ls->linenumber;
- int pc = luaK_codeABC(fs, OP_NEWTABLE, 0, 0, 0);
- struct ConsControl cc;
- cc.na = cc.nh = cc.tostore = 0;
- cc.t = t;
- init_exp(t, VRELOCABLE, pc);
- init_exp(&cc.v, VVOID, 0); /* no value (yet) */
- luaK_exp2nextreg(ls->fs, t); /* fix it at stack top (for gc) */
- check(ls, '{');
- do {
- lua_assert(cc.v.k == VVOID || cc.tostore > 0);
- testnext(ls, ';'); /* compatibility only */
- if (ls->t.token == '}') break;
- closelistfield(fs, &cc);
- switch(ls->t.token) {
- case TK_NAME: { /* may be listfields or recfields */
- lookahead(ls);
- if (ls->lookahead.token != '=') /* expression? */
- listfield(ls, &cc);
- else
- recfield(ls, &cc);
- break;
- }
- case '[': { /* constructor_item -> recfield */
- recfield(ls, &cc);
- break;
- }
- default: { /* constructor_part -> listfield */
- listfield(ls, &cc);
- break;
- }
- }
- } while (testnext(ls, ',') || testnext(ls, ';'));
- check_match(ls, '}', '{', line);
- lastlistfield(fs, &cc);
- SETARG_B(fs->f->code[pc], luaO_int2fb(cc.na)); /* set initial array size */
- SETARG_C(fs->f->code[pc], luaO_log2(cc.nh)+1); /* set initial table size */
-}
-
-/* }====================================================================== */
-
-
-
-static void parlist (LexState *ls) {
- /* parlist -> [ param { `,' param } ] */
- int nparams = 0;
- int dots = 0;
- if (ls->t.token != ')') { /* is `parlist' not empty? */
- do {
- switch (ls->t.token) {
- case TK_DOTS: dots = 1; next(ls); break;
- case TK_NAME: new_localvar(ls, str_checkname(ls), nparams++); break;
- default: luaX_syntaxerror(ls, "<name> or `...' expected");
- }
- } while (!dots && testnext(ls, ','));
- }
- code_params(ls, nparams, dots);
-}
-
-
-static void body (LexState *ls, expdesc *e, int needself, int line) {
- /* body -> `(' parlist `)' chunk END */
- FuncState new_fs;
- open_func(ls, &new_fs);
- new_fs.f->lineDefined = line;
- check(ls, '(');
- if (needself)
- create_local(ls, "self");
- parlist(ls);
- check(ls, ')');
- chunk(ls);
- check_match(ls, TK_END, TK_FUNCTION, line);
- close_func(ls);
- pushclosure(ls, &new_fs, e);
-}
-
-
-static int explist1 (LexState *ls, expdesc *v) {
- /* explist1 -> expr { `,' expr } */
- int n = 1; /* at least one expression */
- expr(ls, v);
- while (testnext(ls, ',')) {
- luaK_exp2nextreg(ls->fs, v);
- expr(ls, v);
- n++;
- }
- return n;
-}
-
-
-static void funcargs (LexState *ls, expdesc *f) {
- FuncState *fs = ls->fs;
- expdesc args;
- int base, nparams;
- int line = ls->linenumber;
- switch (ls->t.token) {
- case '(': { /* funcargs -> `(' [ explist1 ] `)' */
- if (line != ls->lastline)
- luaX_syntaxerror(ls,"ambiguous syntax (function call x new statement)");
- next(ls);
- if (ls->t.token == ')') /* arg list is empty? */
- args.k = VVOID;
- else {
- explist1(ls, &args);
- luaK_setcallreturns(fs, &args, LUA_MULTRET);
- }
- check_match(ls, ')', '(', line);
- break;
- }
- case '{': { /* funcargs -> constructor */
- constructor(ls, &args);
- break;
- }
- case TK_STRING: { /* funcargs -> STRING */
- codestring(ls, &args, ls->t.seminfo.ts);
- next(ls); /* must use `seminfo' before `next' */
- break;
- }
- default: {
- luaX_syntaxerror(ls, "function arguments expected");
- return;
- }
- }
- lua_assert(f->k == VNONRELOC);
- base = f->info; /* base register for call */
- if (args.k == VCALL)
- nparams = LUA_MULTRET; /* open call */
- else {
- if (args.k != VVOID)
- luaK_exp2nextreg(fs, &args); /* close last argument */
- nparams = fs->freereg - (base+1);
- }
- init_exp(f, VCALL, luaK_codeABC(fs, OP_CALL, base, nparams+1, 2));
- luaK_fixline(fs, line);
- fs->freereg = base+1; /* call remove function and arguments and leaves
- (unless changed) one result */
-}
-
-
-
-
-/*
-** {======================================================================
-** Expression parsing
-** =======================================================================
-*/
-
-
-static void prefixexp (LexState *ls, expdesc *v) {
- /* prefixexp -> NAME | '(' expr ')' */
- switch (ls->t.token) {
- case '(': {
- int line = ls->linenumber;
- next(ls);
- expr(ls, v);
- check_match(ls, ')', '(', line);
- luaK_dischargevars(ls->fs, v);
- return;
- }
- case TK_NAME: {
- singlevar(ls, v, 1);
- return;
- }
-#ifdef LUA_COMPATUPSYNTAX
- case '%': { /* for compatibility only */
- TString *varname;
- int line = ls->linenumber;
- next(ls); /* skip `%' */
- varname = singlevar(ls, v, 1);
- if (v->k != VUPVAL)
- luaX_errorline(ls, "global upvalues are obsolete",
- getstr(varname), line);
- return;
- }
-#endif
- default: {
- luaX_syntaxerror(ls, "unexpected symbol");
- return;
- }
- }
-}
-
-
-static void primaryexp (LexState *ls, expdesc *v) {
- /* primaryexp ->
- prefixexp { `.' NAME | `[' exp `]' | `:' NAME funcargs | funcargs } */
- FuncState *fs = ls->fs;
- prefixexp(ls, v);
- for (;;) {
- switch (ls->t.token) {
- case '.': { /* field */
- luaY_field(ls, v);
- break;
- }
- case '[': { /* `[' exp1 `]' */
- expdesc key;
- luaK_exp2anyreg(fs, v);
- luaY_index(ls, &key);
- luaK_indexed(fs, v, &key);
- break;
- }
- case ':': { /* `:' NAME funcargs */
- expdesc key;
- next(ls);
- checkname(ls, &key);
- luaK_self(fs, v, &key);
- funcargs(ls, v);
- break;
- }
- case '(': case TK_STRING: case '{': { /* funcargs */
- luaK_exp2nextreg(fs, v);
- funcargs(ls, v);
- break;
- }
- default: return;
- }
- }
-}
-
-
-static void simpleexp (LexState *ls, expdesc *v) {
- /* simpleexp -> NUMBER | STRING | NIL | constructor | FUNCTION body
- | primaryexp */
- switch (ls->t.token) {
- case TK_NUMBER: {
- init_exp(v, VK, luaK_numberK(ls->fs, ls->t.seminfo.r));
- next(ls); /* must use `seminfo' before `next' */
- break;
- }
- case TK_STRING: {
- codestring(ls, v, ls->t.seminfo.ts);
- next(ls); /* must use `seminfo' before `next' */
- break;
- }
- case TK_NIL: {
- init_exp(v, VNIL, 0);
- next(ls);
- break;
- }
- case TK_TRUE: {
- init_exp(v, VTRUE, 0);
- next(ls);
- break;
- }
- case TK_FALSE: {
- init_exp(v, VFALSE, 0);
- next(ls);
- break;
- }
- case '{': { /* constructor */
- constructor(ls, v);
- break;
- }
- case TK_FUNCTION: {
- next(ls);
- body(ls, v, 0, ls->linenumber);
- break;
- }
- default: {
- primaryexp(ls, v);
- break;
- }
- }
-}
-
-
-static UnOpr getunopr (int op) {
- switch (op) {
- case TK_NOT: return OPR_NOT;
- case '-': return OPR_MINUS;
- default: return OPR_NOUNOPR;
- }
-}
-
-
-static BinOpr getbinopr (int op) {
- switch (op) {
- case '+': return OPR_ADD;
- case '-': return OPR_SUB;
- case '*': return OPR_MULT;
- case '/': return OPR_DIV;
- case '^': return OPR_POW;
- case TK_CONCAT: return OPR_CONCAT;
- case TK_NE: return OPR_NE;
- case TK_EQ: return OPR_EQ;
- case '<': return OPR_LT;
- case TK_LE: return OPR_LE;
- case '>': return OPR_GT;
- case TK_GE: return OPR_GE;
- case TK_AND: return OPR_AND;
- case TK_OR: return OPR_OR;
- default: return OPR_NOBINOPR;
- }
-}
-
-
-static const struct {
- lu_byte left; /* left priority for each binary operator */
- lu_byte right; /* right priority */
-} priority[] = { /* ORDER OPR */
- {6, 6}, {6, 6}, {7, 7}, {7, 7}, /* arithmetic */
- {10, 9}, {5, 4}, /* power and concat (right associative) */
- {3, 3}, {3, 3}, /* equality */
- {3, 3}, {3, 3}, {3, 3}, {3, 3}, /* order */
- {2, 2}, {1, 1} /* logical (and/or) */
-};
-
-#define UNARY_PRIORITY 8 /* priority for unary operators */
-
-
-/*
-** subexpr -> (simplexep | unop subexpr) { binop subexpr }
-** where `binop' is any binary operator with a priority higher than `limit'
-*/
-static BinOpr subexpr (LexState *ls, expdesc *v, int limit) {
- BinOpr op;
- UnOpr uop;
- enterlevel(ls);
- uop = getunopr(ls->t.token);
- if (uop != OPR_NOUNOPR) {
- next(ls);
- subexpr(ls, v, UNARY_PRIORITY);
- luaK_prefix(ls->fs, uop, v);
- }
- else simpleexp(ls, v);
- /* expand while operators have priorities higher than `limit' */
- op = getbinopr(ls->t.token);
- while (op != OPR_NOBINOPR && cast(int, priority[op].left) > limit) {
- expdesc v2;
- BinOpr nextop;
- next(ls);
- luaK_infix(ls->fs, op, v);
- /* read sub-expression with higher priority */
- nextop = subexpr(ls, &v2, cast(int, priority[op].right));
- luaK_posfix(ls->fs, op, v, &v2);
- op = nextop;
- }
- leavelevel(ls);
- return op; /* return first untreated operator */
-}
-
-
-static void expr (LexState *ls, expdesc *v) {
- subexpr(ls, v, -1);
-}
-
-/* }==================================================================== */
-
-
-
-/*
-** {======================================================================
-** Rules for Statements
-** =======================================================================
-*/
-
-
-static int block_follow (int token) {
- switch (token) {
- case TK_ELSE: case TK_ELSEIF: case TK_END:
- case TK_UNTIL: case TK_EOS:
- return 1;
- default: return 0;
- }
-}
-
-
-static void block (LexState *ls) {
- /* block -> chunk */
- FuncState *fs = ls->fs;
- BlockCnt bl;
- enterblock(fs, &bl, 0);
- chunk(ls);
- lua_assert(bl.breaklist == NO_JUMP);
- leaveblock(fs);
-}
-
-
-/*
-** structure to chain all variables in the left-hand side of an
-** assignment
-*/
-struct LHS_assign {
- struct LHS_assign *prev;
- expdesc v; /* variable (global, local, upvalue, or indexed) */
-};
-
-
-/*
-** check whether, in an assignment to a local variable, the local variable
-** is needed in a previous assignment (to a table). If so, save original
-** local value in a safe place and use this safe copy in the previous
-** assignment.
-*/
-static void check_conflict (LexState *ls, struct LHS_assign *lh, expdesc *v) {
- FuncState *fs = ls->fs;
- int extra = fs->freereg; /* eventual position to save local variable */
- int conflict = 0;
- for (; lh; lh = lh->prev) {
- if (lh->v.k == VINDEXED) {
- if (lh->v.info == v->info) { /* conflict? */
- conflict = 1;
- lh->v.info = extra; /* previous assignment will use safe copy */
- }
- if (lh->v.aux == v->info) { /* conflict? */
- conflict = 1;
- lh->v.aux = extra; /* previous assignment will use safe copy */
- }
- }
- }
- if (conflict) {
- luaK_codeABC(fs, OP_MOVE, fs->freereg, v->info, 0); /* make copy */
- luaK_reserveregs(fs, 1);
- }
-}
-
-
-static void assignment (LexState *ls, struct LHS_assign *lh, int nvars) {
- expdesc e;
- check_condition(ls, VLOCAL <= lh->v.k && lh->v.k <= VINDEXED,
- "syntax error");
- if (testnext(ls, ',')) { /* assignment -> `,' primaryexp assignment */
- struct LHS_assign nv;
- nv.prev = lh;
- primaryexp(ls, &nv.v);
- if (nv.v.k == VLOCAL)
- check_conflict(ls, lh, &nv.v);
- assignment(ls, &nv, nvars+1);
- }
- else { /* assignment -> `=' explist1 */
- int nexps;
- check(ls, '=');
- nexps = explist1(ls, &e);
- if (nexps != nvars) {
- adjust_assign(ls, nvars, nexps, &e);
- if (nexps > nvars)
- ls->fs->freereg -= nexps - nvars; /* remove extra values */
- }
- else {
- luaK_setcallreturns(ls->fs, &e, 1); /* close last expression */
- luaK_storevar(ls->fs, &lh->v, &e);
- return; /* avoid default */
- }
- }
- init_exp(&e, VNONRELOC, ls->fs->freereg-1); /* default assignment */
- luaK_storevar(ls->fs, &lh->v, &e);
-}
-
-
-static void cond (LexState *ls, expdesc *v) {
- /* cond -> exp */
- expr(ls, v); /* read condition */
- if (v->k == VNIL) v->k = VFALSE; /* `falses' are all equal here */
- luaK_goiftrue(ls->fs, v);
- luaK_patchtohere(ls->fs, v->t);
-}
-
-
-/*
-** The while statement optimizes its code by coding the condition
-** after its body (and thus avoiding one jump in the loop).
-*/
-
-/*
-** maximum size of expressions for optimizing `while' code
-*/
-#ifndef MAXEXPWHILE
-#define MAXEXPWHILE 100
-#endif
-
-/*
-** the call `luaK_goiffalse' may grow the size of an expression by
-** at most this:
-*/
-#define EXTRAEXP 5
-
-static void whilestat (LexState *ls, int line) {
- /* whilestat -> WHILE cond DO block END */
- Instruction codeexp[MAXEXPWHILE + EXTRAEXP];
- int lineexp;
- int i;
- int sizeexp;
- FuncState *fs = ls->fs;
- int whileinit, blockinit, expinit;
- expdesc v;
- BlockCnt bl;
- next(ls); /* skip WHILE */
- whileinit = luaK_jump(fs); /* jump to condition (which will be moved) */
- expinit = luaK_getlabel(fs);
- expr(ls, &v); /* parse condition */
- if (v.k == VK) v.k = VTRUE; /* `trues' are all equal here */
- lineexp = ls->linenumber;
- luaK_goiffalse(fs, &v);
- luaK_concat(fs, &v.f, fs->jpc);
- fs->jpc = NO_JUMP;
- sizeexp = fs->pc - expinit; /* size of expression code */
- if (sizeexp > MAXEXPWHILE)
- luaX_syntaxerror(ls, "`while' condition too complex");
- for (i = 0; i < sizeexp; i++) /* save `exp' code */
- codeexp[i] = fs->f->code[expinit + i];
- fs->pc = expinit; /* remove `exp' code */
- enterblock(fs, &bl, 1);
- check(ls, TK_DO);
- blockinit = luaK_getlabel(fs);
- block(ls);
- luaK_patchtohere(fs, whileinit); /* initial jump jumps to here */
- /* move `exp' back to code */
- if (v.t != NO_JUMP) v.t += fs->pc - expinit;
- if (v.f != NO_JUMP) v.f += fs->pc - expinit;
- for (i=0; i<sizeexp; i++)
- luaK_code(fs, codeexp[i], lineexp);
- check_match(ls, TK_END, TK_WHILE, line);
- leaveblock(fs);
- luaK_patchlist(fs, v.t, blockinit); /* true conditions go back to loop */
- luaK_patchtohere(fs, v.f); /* false conditions finish the loop */
-}
-
-
-static void repeatstat (LexState *ls, int line) {
- /* repeatstat -> REPEAT block UNTIL cond */
- FuncState *fs = ls->fs;
- int repeat_init = luaK_getlabel(fs);
- expdesc v;
- BlockCnt bl;
- enterblock(fs, &bl, 1);
- next(ls);
- block(ls);
- check_match(ls, TK_UNTIL, TK_REPEAT, line);
- cond(ls, &v);
- luaK_patchlist(fs, v.f, repeat_init);
- leaveblock(fs);
-}
-
-
-static int exp1 (LexState *ls) {
- expdesc e;
- int k;
- expr(ls, &e);
- k = e.k;
- luaK_exp2nextreg(ls->fs, &e);
- return k;
-}
-
-
-static void forbody (LexState *ls, int base, int line, int nvars, int isnum) {
- BlockCnt bl;
- FuncState *fs = ls->fs;
- int prep, endfor;
- adjustlocalvars(ls, nvars); /* scope for all variables */
- check(ls, TK_DO);
- enterblock(fs, &bl, 1); /* loop block */
- prep = luaK_getlabel(fs);
- block(ls);
- luaK_patchtohere(fs, prep-1);
- endfor = (isnum) ? luaK_codeAsBx(fs, OP_FORLOOP, base, NO_JUMP) :
- luaK_codeABC(fs, OP_TFORLOOP, base, 0, nvars - 3);
- luaK_fixline(fs, line); /* pretend that `OP_FOR' starts the loop */
- luaK_patchlist(fs, (isnum) ? endfor : luaK_jump(fs), prep);
- leaveblock(fs);
-}
-
-
-static void fornum (LexState *ls, TString *varname, int line) {
- /* fornum -> NAME = exp1,exp1[,exp1] DO body */
- FuncState *fs = ls->fs;
- int base = fs->freereg;
- new_localvar(ls, varname, 0);
- new_localvarstr(ls, "(for limit)", 1);
- new_localvarstr(ls, "(for step)", 2);
- check(ls, '=');
- exp1(ls); /* initial value */
- check(ls, ',');
- exp1(ls); /* limit */
- if (testnext(ls, ','))
- exp1(ls); /* optional step */
- else { /* default step = 1 */
- luaK_codeABx(fs, OP_LOADK, fs->freereg, luaK_numberK(fs, 1));
- luaK_reserveregs(fs, 1);
- }
- luaK_codeABC(fs, OP_SUB, fs->freereg - 3, fs->freereg - 3, fs->freereg - 1);
- luaK_jump(fs);
- forbody(ls, base, line, 3, 1);
-}
-
-
-static void forlist (LexState *ls, TString *indexname) {
- /* forlist -> NAME {,NAME} IN explist1 DO body */
- FuncState *fs = ls->fs;
- expdesc e;
- int nvars = 0;
- int line;
- int base = fs->freereg;
- new_localvarstr(ls, "(for generator)", nvars++);
- new_localvarstr(ls, "(for state)", nvars++);
- new_localvar(ls, indexname, nvars++);
- while (testnext(ls, ','))
- new_localvar(ls, str_checkname(ls), nvars++);
- check(ls, TK_IN);
- line = ls->linenumber;
- adjust_assign(ls, nvars, explist1(ls, &e), &e);
- luaK_checkstack(fs, 3); /* extra space to call generator */
- luaK_codeAsBx(fs, OP_TFORPREP, base, NO_JUMP);
- forbody(ls, base, line, nvars, 0);
-}
-
-
-static void forstat (LexState *ls, int line) {
- /* forstat -> fornum | forlist */
- FuncState *fs = ls->fs;
- TString *varname;
- BlockCnt bl;
- enterblock(fs, &bl, 0); /* block to control variable scope */
- next(ls); /* skip `for' */
- varname = str_checkname(ls); /* first variable name */
- switch (ls->t.token) {
- case '=': fornum(ls, varname, line); break;
- case ',': case TK_IN: forlist(ls, varname); break;
- default: luaX_syntaxerror(ls, "`=' or `in' expected");
- }
- check_match(ls, TK_END, TK_FOR, line);
- leaveblock(fs);
-}
-
-
-static void test_then_block (LexState *ls, expdesc *v) {
- /* test_then_block -> [IF | ELSEIF] cond THEN block */
- next(ls); /* skip IF or ELSEIF */
- cond(ls, v);
- check(ls, TK_THEN);
- block(ls); /* `then' part */
-}
-
-
-static void ifstat (LexState *ls, int line) {
- /* ifstat -> IF cond THEN block {ELSEIF cond THEN block} [ELSE block] END */
- FuncState *fs = ls->fs;
- expdesc v;
- int escapelist = NO_JUMP;
- test_then_block(ls, &v); /* IF cond THEN block */
- while (ls->t.token == TK_ELSEIF) {
- luaK_concat(fs, &escapelist, luaK_jump(fs));
- luaK_patchtohere(fs, v.f);
- test_then_block(ls, &v); /* ELSEIF cond THEN block */
- }
- if (ls->t.token == TK_ELSE) {
- luaK_concat(fs, &escapelist, luaK_jump(fs));
- luaK_patchtohere(fs, v.f);
- next(ls); /* skip ELSE (after patch, for correct line info) */
- block(ls); /* `else' part */
- }
- else
- luaK_concat(fs, &escapelist, v.f);
- luaK_patchtohere(fs, escapelist);
- check_match(ls, TK_END, TK_IF, line);
-}
-
-
-static void localfunc (LexState *ls) {
- expdesc v, b;
- FuncState *fs = ls->fs;
- new_localvar(ls, str_checkname(ls), 0);
- init_exp(&v, VLOCAL, fs->freereg);
- luaK_reserveregs(fs, 1);
- adjustlocalvars(ls, 1);
- body(ls, &b, 0, ls->linenumber);
- luaK_storevar(fs, &v, &b);
- /* debug information will only see the variable after this point! */
- getlocvar(fs, fs->nactvar - 1).startpc = fs->pc;
-}
-
-
-static void localstat (LexState *ls) {
- /* stat -> LOCAL NAME {`,' NAME} [`=' explist1] */
- int nvars = 0;
- int nexps;
- expdesc e;
- do {
- new_localvar(ls, str_checkname(ls), nvars++);
- } while (testnext(ls, ','));
- if (testnext(ls, '='))
- nexps = explist1(ls, &e);
- else {
- e.k = VVOID;
- nexps = 0;
- }
- adjust_assign(ls, nvars, nexps, &e);
- adjustlocalvars(ls, nvars);
-}
-
-
-static int funcname (LexState *ls, expdesc *v) {
- /* funcname -> NAME {field} [`:' NAME] */
- int needself = 0;
- singlevar(ls, v, 1);
- while (ls->t.token == '.')
- luaY_field(ls, v);
- if (ls->t.token == ':') {
- needself = 1;
- luaY_field(ls, v);
- }
- return needself;
-}
-
-
-static void funcstat (LexState *ls, int line) {
- /* funcstat -> FUNCTION funcname body */
- int needself;
- expdesc v, b;
- next(ls); /* skip FUNCTION */
- needself = funcname(ls, &v);
- body(ls, &b, needself, line);
- luaK_storevar(ls->fs, &v, &b);
- luaK_fixline(ls->fs, line); /* definition `happens' in the first line */
-}
-
-
-static void exprstat (LexState *ls) {
- /* stat -> func | assignment */
- FuncState *fs = ls->fs;
- struct LHS_assign v;
- primaryexp(ls, &v.v);
- if (v.v.k == VCALL) { /* stat -> func */
- luaK_setcallreturns(fs, &v.v, 0); /* call statement uses no results */
- }
- else { /* stat -> assignment */
- v.prev = NULL;
- assignment(ls, &v, 1);
- }
-}
-
-
-static void retstat (LexState *ls) {
- /* stat -> RETURN explist */
- FuncState *fs = ls->fs;
- expdesc e;
- int first, nret; /* registers with returned values */
- next(ls); /* skip RETURN */
- if (block_follow(ls->t.token) || ls->t.token == ';')
- first = nret = 0; /* return no values */
- else {
- nret = explist1(ls, &e); /* optional return values */
- if (e.k == VCALL) {
- luaK_setcallreturns(fs, &e, LUA_MULTRET);
- if (nret == 1) { /* tail call? */
- SET_OPCODE(getcode(fs,&e), OP_TAILCALL);
- lua_assert(GETARG_A(getcode(fs,&e)) == fs->nactvar);
- }
- first = fs->nactvar;
- nret = LUA_MULTRET; /* return all values */
- }
- else {
- if (nret == 1) /* only one single value? */
- first = luaK_exp2anyreg(fs, &e);
- else {
- luaK_exp2nextreg(fs, &e); /* values must go to the `stack' */
- first = fs->nactvar; /* return all `active' values */
- lua_assert(nret == fs->freereg - first);
- }
- }
- }
- luaK_codeABC(fs, OP_RETURN, first, nret+1, 0);
-}
-
-
-static void breakstat (LexState *ls) {
- /* stat -> BREAK [NAME] */
- FuncState *fs = ls->fs;
- BlockCnt *bl = fs->bl;
- int upval = 0;
- next(ls); /* skip BREAK */
- while (bl && !bl->isbreakable) {
- upval |= bl->upval;
- bl = bl->previous;
- }
- if (!bl)
- luaX_syntaxerror(ls, "no loop to break");
- if (upval)
- luaK_codeABC(fs, OP_CLOSE, bl->nactvar, 0, 0);
- luaK_concat(fs, &bl->breaklist, luaK_jump(fs));
-}
-
-
-static int statement (LexState *ls) {
- int line = ls->linenumber; /* may be needed for error messages */
- switch (ls->t.token) {
- case TK_IF: { /* stat -> ifstat */
- ifstat(ls, line);
- return 0;
- }
- case TK_WHILE: { /* stat -> whilestat */
- whilestat(ls, line);
- return 0;
- }
- case TK_DO: { /* stat -> DO block END */
- next(ls); /* skip DO */
- block(ls);
- check_match(ls, TK_END, TK_DO, line);
- return 0;
- }
- case TK_FOR: { /* stat -> forstat */
- forstat(ls, line);
- return 0;
- }
- case TK_REPEAT: { /* stat -> repeatstat */
- repeatstat(ls, line);
- return 0;
- }
- case TK_FUNCTION: {
- funcstat(ls, line); /* stat -> funcstat */
- return 0;
- }
- case TK_LOCAL: { /* stat -> localstat */
- next(ls); /* skip LOCAL */
- if (testnext(ls, TK_FUNCTION)) /* local function? */
- localfunc(ls);
- else
- localstat(ls);
- return 0;
- }
- case TK_RETURN: { /* stat -> retstat */
- retstat(ls);
- return 1; /* must be last statement */
- }
- case TK_BREAK: { /* stat -> breakstat */
- breakstat(ls);
- return 1; /* must be last statement */
- }
- default: {
- exprstat(ls);
- return 0; /* to avoid warnings */
- }
- }
-}
-
-
-static void chunk (LexState *ls) {
- /* chunk -> { stat [`;'] } */
- int islast = 0;
- enterlevel(ls);
- while (!islast && !block_follow(ls->t.token)) {
- islast = statement(ls);
- testnext(ls, ';');
- lua_assert(ls->fs->freereg >= ls->fs->nactvar);
- ls->fs->freereg = ls->fs->nactvar; /* free registers */
- }
- leavelevel(ls);
-}
-
-/* }====================================================================== */
+++ /dev/null
-/*
-** $Id: lparser.h,v 1.47 2003/02/11 10:46:24 roberto Exp $
-** Lua Parser
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lparser_h
-#define lparser_h
-
-#include "llimits.h"
-#include "lobject.h"
-#include "ltable.h"
-#include "lzio.h"
-
-
-/*
-** Expression descriptor
-*/
-
-typedef enum {
- VVOID, /* no value */
- VNIL,
- VTRUE,
- VFALSE,
- VK, /* info = index of constant in `k' */
- VLOCAL, /* info = local register */
- VUPVAL, /* info = index of upvalue in `upvalues' */
- VGLOBAL, /* info = index of table; aux = index of global name in `k' */
- VINDEXED, /* info = table register; aux = index register (or `k') */
- VJMP, /* info = instruction pc */
- VRELOCABLE, /* info = instruction pc */
- VNONRELOC, /* info = result register */
- VCALL /* info = result register */
-} expkind;
-
-typedef struct expdesc {
- expkind k;
- int info, aux;
- int t; /* patch list of `exit when true' */
- int f; /* patch list of `exit when false' */
-} expdesc;
-
-
-struct BlockCnt; /* defined in lparser.c */
-
-
-/* state needed to generate code for a given function */
-typedef struct FuncState {
- Proto *f; /* current function header */
- Table *h; /* table to find (and reuse) elements in `k' */
- struct FuncState *prev; /* enclosing function */
- struct LexState *ls; /* lexical state */
- struct lua_State *L; /* copy of the Lua state */
- struct BlockCnt *bl; /* chain of current blocks */
- int pc; /* next position to code (equivalent to `ncode') */
- int lasttarget; /* `pc' of last `jump target' */
- int jpc; /* list of pending jumps to `pc' */
- int freereg; /* first free register */
- int nk; /* number of elements in `k' */
- int np; /* number of elements in `p' */
- int nlocvars; /* number of elements in `locvars' */
- int nactvar; /* number of active local variables */
- expdesc upvalues[MAXUPVALUES]; /* upvalues */
- int actvar[MAXVARS]; /* declared-variable stack */
-} FuncState;
-
-
-Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lstate.c,v 1.123 2003/04/03 13:35:34 roberto Exp $
-** Global State
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-
-#define lstate_c
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "llex.h"
-#include "lmem.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-
-
-/*
-** macro to allow the inclusion of user information in Lua state
-*/
-#ifndef LUA_USERSTATE
-#define EXTRASPACE 0
-#else
-union UEXTRASPACE {L_Umaxalign a; LUA_USERSTATE b;};
-#define EXTRASPACE (sizeof(union UEXTRASPACE))
-#endif
-
-
-
-/*
-** you can change this function through the official API:
-** call `lua_setpanicf'
-*/
-static int default_panic (lua_State *L) {
- UNUSED(L);
- return 0;
-}
-
-
-static lua_State *mallocstate (lua_State *L) {
- lu_byte *block = (lu_byte *)luaM_malloc(L, sizeof(lua_State) + EXTRASPACE);
- if (block == NULL) return NULL;
- else {
- block += EXTRASPACE;
- return cast(lua_State *, block);
- }
-}
-
-
-static void freestate (lua_State *L, lua_State *L1) {
- luaM_free(L, cast(lu_byte *, L1) - EXTRASPACE,
- sizeof(lua_State) + EXTRASPACE);
-}
-
-
-static void stack_init (lua_State *L1, lua_State *L) {
- L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TObject);
- L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
- L1->top = L1->stack;
- L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
- L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
- L1->ci = L1->base_ci;
- L1->ci->state = CI_C; /* not a Lua function */
- setnilvalue(L1->top++); /* `function' entry for this `ci' */
- L1->base = L1->ci->base = L1->top;
- L1->ci->top = L1->top + LUA_MINSTACK;
- L1->size_ci = BASIC_CI_SIZE;
- L1->end_ci = L1->base_ci + L1->size_ci;
-}
-
-
-static void freestack (lua_State *L, lua_State *L1) {
- luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
- luaM_freearray(L, L1->stack, L1->stacksize, TObject);
-}
-
-
-/*
-** open parts that may cause memory-allocation errors
-*/
-static void f_luaopen (lua_State *L, void *ud) {
- /* create a new global state */
- global_State *g = luaM_new(NULL, global_State);
- UNUSED(ud);
- if (g == NULL) luaD_throw(L, LUA_ERRMEM);
- L->l_G = g;
- g->mainthread = L;
- g->GCthreshold = 0; /* mark it as unfinished state */
- g->strt.size = 0;
- g->strt.nuse = 0;
- g->strt.hash = NULL;
- setnilvalue(defaultmeta(L));
- setnilvalue(registry(L));
- luaZ_initbuffer(L, &g->buff);
- g->panic = default_panic;
- g->rootgc = NULL;
- g->rootudata = NULL;
- g->tmudata = NULL;
- setnilvalue(gkey(g->dummynode));
- setnilvalue(gval(g->dummynode));
- g->dummynode->next = NULL;
- g->nblocks = sizeof(lua_State) + sizeof(global_State);
- stack_init(L, L); /* init stack */
- /* create default meta table with a dummy table, and then close the loop */
- defaultmeta(L)->tt = LUA_TTABLE;
- sethvalue(defaultmeta(L), luaH_new(L, 0, 0));
- hvalue(defaultmeta(L))->metatable = hvalue(defaultmeta(L));
- sethvalue(gt(L), luaH_new(L, 0, 4)); /* table of globals */
- sethvalue(registry(L), luaH_new(L, 4, 4)); /* registry */
- luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
- luaT_init(L);
- luaX_init(L);
- luaS_fix(luaS_newliteral(L, MEMERRMSG));
- g->GCthreshold = 4*G(L)->nblocks;
-}
-
-
-static void preinit_state (lua_State *L) {
- L->stack = NULL;
- L->stacksize = 0;
- L->errorJmp = NULL;
- L->hook = NULL;
- L->hookmask = L->hookinit = 0;
- L->basehookcount = 0;
- L->allowhook = 1;
- resethookcount(L);
- L->openupval = NULL;
- L->size_ci = 0;
- L->nCcalls = 0;
- L->base_ci = L->ci = NULL;
- L->errfunc = 0;
- setnilvalue(gt(L));
-}
-
-
-static void close_state (lua_State *L) {
- luaF_close(L, L->stack); /* close all upvalues for this thread */
- if (G(L)) { /* close global state */
- luaC_sweep(L, 1); /* collect all elements */
- lua_assert(G(L)->rootgc == NULL);
- lua_assert(G(L)->rootudata == NULL);
- luaS_freeall(L);
- luaZ_freebuffer(L, &G(L)->buff);
- }
- freestack(L, L);
- if (G(L)) {
- lua_assert(G(L)->nblocks == sizeof(lua_State) + sizeof(global_State));
- luaM_freelem(NULL, G(L));
- }
- freestate(NULL, L);
-}
-
-
-lua_State *luaE_newthread (lua_State *L) {
- lua_State *L1 = mallocstate(L);
- luaC_link(L, valtogco(L1), LUA_TTHREAD);
- preinit_state(L1);
- L1->l_G = L->l_G;
- stack_init(L1, L); /* init stack */
- setobj2n(gt(L1), gt(L)); /* share table of globals */
- return L1;
-}
-
-
-void luaE_freethread (lua_State *L, lua_State *L1) {
- luaF_close(L1, L1->stack); /* close all upvalues for this thread */
- lua_assert(L1->openupval == NULL);
- freestack(L, L1);
- freestate(L, L1);
-}
-
-
-LUA_API lua_State *lua_open (void) {
- lua_State *L = mallocstate(NULL);
- if (L) { /* allocation OK? */
- L->tt = LUA_TTHREAD;
- L->marked = 0;
- L->next = L->gclist = NULL;
- preinit_state(L);
- L->l_G = NULL;
- if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
- /* memory allocation error: free partial state */
- close_state(L);
- L = NULL;
- }
- }
- lua_userstateopen(L);
- return L;
-}
-
-
-static void callallgcTM (lua_State *L, void *ud) {
- UNUSED(ud);
- luaC_callGCTM(L); /* call GC metamethods for all udata */
-}
-
-
-LUA_API void lua_close (lua_State *L) {
- lua_lock(L);
- L = G(L)->mainthread; /* only the main thread can be closed */
- luaF_close(L, L->stack); /* close all upvalues for this thread */
- luaC_separateudata(L); /* separate udata that have GC metamethods */
- L->errfunc = 0; /* no error function during GC metamethods */
- do { /* repeat until no more errors */
- L->ci = L->base_ci;
- L->base = L->top = L->ci->base;
- L->nCcalls = 0;
- } while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
- lua_assert(G(L)->tmudata == NULL);
- close_state(L);
-}
-
+++ /dev/null
-/*
-** $Id: lstate.h,v 1.109 2003/02/27 11:52:30 roberto Exp $
-** Global State
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lstate_h
-#define lstate_h
-
-#include "lua.h"
-
-#include "lobject.h"
-#include "ltm.h"
-#include "lzio.h"
-
-
-/*
-** macros for thread synchronization inside Lua core machine:
-** all accesses to the global state and to global objects are synchronized.
-** Because threads can read the stack of other threads
-** (when running garbage collection),
-** a thread must also synchronize any write-access to its own stack.
-** Unsynchronized accesses are allowed only when reading its own stack,
-** or when reading immutable fields from global objects
-** (such as string values and udata values).
-*/
-#ifndef lua_lock
-#define lua_lock(L) ((void) 0)
-#endif
-
-#ifndef lua_unlock
-#define lua_unlock(L) ((void) 0)
-#endif
-
-
-#ifndef lua_userstateopen
-#define lua_userstateopen(l)
-#endif
-
-
-
-struct lua_longjmp; /* defined in ldo.c */
-
-
-/* default meta table (both for tables and udata) */
-#define defaultmeta(L) (&G(L)->_defaultmeta)
-
-/* table of globals */
-#define gt(L) (&L->_gt)
-
-/* registry */
-#define registry(L) (&G(L)->_registry)
-
-
-/* extra stack space to handle TM calls and some other extras */
-#define EXTRA_STACK 5
-
-
-#define BASIC_CI_SIZE 8
-
-#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
-
-
-
-typedef struct stringtable {
- GCObject **hash;
- ls_nstr nuse; /* number of elements */
- int size;
-} stringtable;
-
-
-/*
-** informations about a call
-*/
-typedef struct CallInfo {
- StkId base; /* base for called function */
- StkId top; /* top for this function */
- int state; /* bit fields; see below */
- union {
- struct { /* for Lua functions */
- const Instruction *savedpc;
- const Instruction **pc; /* points to `pc' variable in `luaV_execute' */
- int tailcalls; /* number of tail calls lost under this entry */
- } l;
- struct { /* for C functions */
- int dummy; /* just to avoid an empty struct */
- } c;
- } u;
-} CallInfo;
-
-
-/*
-** bit fields for `CallInfo.state'
-*/
-#define CI_C (1<<0) /* 1 if function is a C function */
-/* 1 if (Lua) function has an active `luaV_execute' running it */
-#define CI_HASFRAME (1<<1)
-/* 1 if Lua function is calling another Lua function (and therefore its
- `pc' is being used by the other, and therefore CI_SAVEDPC is 1 too) */
-#define CI_CALLING (1<<2)
-#define CI_SAVEDPC (1<<3) /* 1 if `savedpc' is updated */
-#define CI_YIELD (1<<4) /* 1 if thread is suspended */
-
-
-#define ci_func(ci) (clvalue((ci)->base - 1))
-
-
-/*
-** `global state', shared by all threads of this state
-*/
-typedef struct global_State {
- stringtable strt; /* hash table for strings */
- GCObject *rootgc; /* list of (almost) all collectable objects */
- GCObject *rootudata; /* (separated) list of all userdata */
- GCObject *tmudata; /* list of userdata to be GC */
- Mbuffer buff; /* temporary buffer for string concatentation */
- lu_mem GCthreshold;
- lu_mem nblocks; /* number of `bytes' currently allocated */
- lua_CFunction panic; /* to be called in unprotected errors */
- TObject _registry;
- TObject _defaultmeta;
- struct lua_State *mainthread;
- Node dummynode[1]; /* common node array for all empty tables */
- TString *tmname[TM_N]; /* array with tag-method names */
-} global_State;
-
-
-/*
-** `per thread' state
-*/
-struct lua_State {
- CommonHeader;
- StkId top; /* first free slot in the stack */
- StkId base; /* base of current function */
- global_State *l_G;
- CallInfo *ci; /* call info for current function */
- StkId stack_last; /* last free slot in the stack */
- StkId stack; /* stack base */
- int stacksize;
- CallInfo *end_ci; /* points after end of ci array*/
- CallInfo *base_ci; /* array of CallInfo's */
- unsigned short size_ci; /* size of array `base_ci' */
- unsigned short nCcalls; /* number of nested C calls */
- lu_byte hookmask;
- lu_byte allowhook;
- lu_byte hookinit;
- int basehookcount;
- int hookcount;
- lua_Hook hook;
- TObject _gt; /* table of globals */
- GCObject *openupval; /* list of open upvalues in this stack */
- GCObject *gclist;
- struct lua_longjmp *errorJmp; /* current error recover point */
- ptrdiff_t errfunc; /* current error handling function (stack index) */
-};
-
-
-#define G(L) (L->l_G)
-
-
-/*
-** Union of all collectable objects
-*/
-union GCObject {
- GCheader gch;
- union TString ts;
- union Udata u;
- union Closure cl;
- struct Table h;
- struct Proto p;
- struct UpVal uv;
- struct lua_State th; /* thread */
-};
-
-
-/* macros to convert a GCObject into a specific value */
-#define gcotots(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
-#define gcotou(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
-#define gcotocl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
-#define gcotoh(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
-#define gcotop(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
-#define gcotouv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
-#define ngcotouv(o) \
- check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
-#define gcototh(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
-
-/* macro to convert any value into a GCObject */
-#define valtogco(v) (cast(GCObject *, (v)))
-
-
-lua_State *luaE_newthread (lua_State *L);
-void luaE_freethread (lua_State *L, lua_State *L1);
-
-#endif
-
+++ /dev/null
-/*
-** $Id: lstring.c,v 1.78 2002/12/04 17:38:31 roberto Exp $
-** String table (keeps all strings handled by Lua)
-** See Copyright Notice in lua.h
-*/
-
-
-#include <string.h>
-
-#define lstring_c
-
-#include "lua.h"
-
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-
-
-
-void luaS_freeall (lua_State *L) {
- lua_assert(G(L)->strt.nuse==0);
- luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
-}
-
-
-void luaS_resize (lua_State *L, int newsize) {
- GCObject **newhash = luaM_newvector(L, newsize, GCObject *);
- stringtable *tb = &G(L)->strt;
- int i;
- for (i=0; i<newsize; i++) newhash[i] = NULL;
- /* rehash */
- for (i=0; i<tb->size; i++) {
- GCObject *p = tb->hash[i];
- while (p) { /* for each node in the list */
- GCObject *next = p->gch.next; /* save next */
- lu_hash h = gcotots(p)->tsv.hash;
- int h1 = lmod(h, newsize); /* new position */
- lua_assert(cast(int, h%newsize) == lmod(h, newsize));
- p->gch.next = newhash[h1]; /* chain it */
- newhash[h1] = p;
- p = next;
- }
- }
- luaM_freearray(L, tb->hash, tb->size, TString *);
- tb->size = newsize;
- tb->hash = newhash;
-}
-
-
-static TString *newlstr (lua_State *L, const char *str, size_t l, lu_hash h) {
- TString *ts = cast(TString *, luaM_malloc(L, sizestring(l)));
- stringtable *tb;
- ts->tsv.len = l;
- ts->tsv.hash = h;
- ts->tsv.marked = 0;
- ts->tsv.tt = LUA_TSTRING;
- ts->tsv.reserved = 0;
- memcpy(ts+1, str, l*sizeof(char));
- ((char *)(ts+1))[l] = '\0'; /* ending 0 */
- tb = &G(L)->strt;
- h = lmod(h, tb->size);
- ts->tsv.next = tb->hash[h]; /* chain new entry */
- tb->hash[h] = valtogco(ts);
- tb->nuse++;
- if (tb->nuse > cast(ls_nstr, tb->size) && tb->size <= MAX_INT/2)
- luaS_resize(L, tb->size*2); /* too crowded */
- return ts;
-}
-
-
-TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
- GCObject *o;
- lu_hash h = (lu_hash)l; /* seed */
- size_t step = (l>>5)+1; /* if string is too long, don't hash all its chars */
- size_t l1;
- for (l1=l; l1>=step; l1-=step) /* compute hash */
- h = h ^ ((h<<5)+(h>>2)+(unsigned char)(str[l1-1]));
- for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
- o != NULL;
- o = o->gch.next) {
- TString *ts = gcotots(o);
- if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0))
- return ts;
- }
- return newlstr(L, str, l, h); /* not found */
-}
-
-
-Udata *luaS_newudata (lua_State *L, size_t s) {
- Udata *u;
- u = cast(Udata *, luaM_malloc(L, sizeudata(s)));
- u->uv.marked = (1<<1); /* is not finalized */
- u->uv.tt = LUA_TUSERDATA;
- u->uv.len = s;
- u->uv.metatable = hvalue(defaultmeta(L));
- /* chain it on udata list */
- u->uv.next = G(L)->rootudata;
- G(L)->rootudata = valtogco(u);
- return u;
-}
-
+++ /dev/null
-/*
-** $Id: lstring.h,v 1.37 2002/08/16 14:45:55 roberto Exp $
-** String table (keep all strings handled by Lua)
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lstring_h
-#define lstring_h
-
-
-#include "lobject.h"
-#include "lstate.h"
-
-
-
-#define sizestring(l) (cast(lu_mem, sizeof(union TString))+ \
- (cast(lu_mem, l)+1)*sizeof(char))
-
-#define sizeudata(l) (cast(lu_mem, sizeof(union Udata))+(l))
-
-#define luaS_new(L, s) (luaS_newlstr(L, s, strlen(s)))
-#define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \
- (sizeof(s)/sizeof(char))-1))
-
-#define luaS_fix(s) ((s)->tsv.marked |= (1<<4))
-
-void luaS_resize (lua_State *L, int newsize);
-Udata *luaS_newudata (lua_State *L, size_t s);
-void luaS_freeall (lua_State *L);
-TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: ltable.c,v 1.132 2003/04/03 13:35:34 roberto Exp $
-** Lua tables (hash)
-** See Copyright Notice in lua.h
-*/
-
-
-/*
-** Implementation of tables (aka arrays, objects, or hash tables).
-** Tables keep its elements in two parts: an array part and a hash part.
-** Non-negative integer keys are all candidates to be kept in the array
-** part. The actual size of the array is the largest `n' such that at
-** least half the slots between 0 and n are in use.
-** Hash uses a mix of chained scatter table with Brent's variation.
-** A main invariant of these tables is that, if an element is not
-** in its main position (i.e. the `original' position that its hash gives
-** to it), then the colliding element is in its own main position.
-** In other words, there are collisions only when two elements have the
-** same main position (i.e. the same hash values for that table size).
-** Because of that, the load factor of these tables can be 100% without
-** performance penalties.
-*/
-
-#include <string.h>
-
-#define ltable_c
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "ltable.h"
-
-
-/*
-** max size of array part is 2^MAXBITS
-*/
-#if BITS_INT > 26
-#define MAXBITS 24
-#else
-#define MAXBITS (BITS_INT-2)
-#endif
-
-/* check whether `x' < 2^MAXBITS */
-#define toobig(x) ((((x)-1) >> MAXBITS) != 0)
-
-
-/* function to convert a lua_Number to int (with any rounding method) */
-#ifndef lua_number2int
-#define lua_number2int(i,n) ((i)=(int)(n))
-#endif
-
-
-#define hashpow2(t,n) (gnode(t, lmod((n), sizenode(t))))
-
-#define hashstr(t,str) hashpow2(t, (str)->tsv.hash)
-#define hashboolean(t,p) hashpow2(t, p)
-
-
-/*
-** for some types, it is better to avoid modulus by power of 2, as
-** they tend to have many 2 factors.
-*/
-#define hashmod(t,n) (gnode(t, ((n) % ((sizenode(t)-1)|1))))
-
-
-#define hashpointer(t,p) hashmod(t, IntPoint(p))
-
-
-/*
-** number of ints inside a lua_Number
-*/
-#define numints cast(int, sizeof(lua_Number)/sizeof(int))
-
-
-/*
-** hash for lua_Numbers
-*/
-static Node *hashnum (const Table *t, lua_Number n) {
- unsigned int a[numints];
- int i;
- n += 1; /* normalize number (avoid -0) */
- lua_assert(sizeof(a) <= sizeof(n));
- memcpy(a, &n, sizeof(a));
- for (i = 1; i < numints; i++) a[0] += a[i];
- return hashmod(t, cast(lu_hash, a[0]));
-}
-
-
-
-/*
-** returns the `main' position of an element in a table (that is, the index
-** of its hash value)
-*/
-Node *luaH_mainposition (const Table *t, const TObject *key) {
- switch (ttype(key)) {
- case LUA_TNUMBER:
- return hashnum(t, nvalue(key));
- case LUA_TSTRING:
- return hashstr(t, tsvalue(key));
- case LUA_TBOOLEAN:
- return hashboolean(t, bvalue(key));
- case LUA_TLIGHTUSERDATA:
- return hashpointer(t, pvalue(key));
- default:
- return hashpointer(t, gcvalue(key));
- }
-}
-
-
-/*
-** returns the index for `key' if `key' is an appropriate key to live in
-** the array part of the table, -1 otherwise.
-*/
-static int arrayindex (const TObject *key) {
- if (ttisnumber(key)) {
- int k;
- lua_number2int(k, (nvalue(key)));
- if (cast(lua_Number, k) == nvalue(key) && k >= 1 && !toobig(k))
- return k;
- }
- return -1; /* `key' did not match some condition */
-}
-
-
-/*
-** returns the index of a `key' for table traversals. First goes all
-** elements in the array part, then elements in the hash part. The
-** beginning and end of a traversal are signalled by -1.
-*/
-static int luaH_index (lua_State *L, Table *t, StkId key) {
- int i;
- if (ttisnil(key)) return -1; /* first iteration */
- i = arrayindex(key);
- if (0 <= i && i <= t->sizearray) { /* is `key' inside array part? */
- return i-1; /* yes; that's the index (corrected to C) */
- }
- else {
- const TObject *v = luaH_get(t, key);
- if (v == &luaO_nilobject)
- luaG_runerror(L, "invalid key for `next'");
- i = cast(int, (cast(const lu_byte *, v) -
- cast(const lu_byte *, gval(gnode(t, 0)))) / sizeof(Node));
- return i + t->sizearray; /* hash elements are numbered after array ones */
- }
-}
-
-
-int luaH_next (lua_State *L, Table *t, StkId key) {
- int i = luaH_index(L, t, key); /* find original element */
- for (i++; i < t->sizearray; i++) { /* try first array part */
- if (!ttisnil(&t->array[i])) { /* a non-nil value? */
- setnvalue(key, cast(lua_Number, i+1));
- setobj2s(key+1, &t->array[i]);
- return 1;
- }
- }
- for (i -= t->sizearray; i < sizenode(t); i++) { /* then hash part */
- if (!ttisnil(gval(gnode(t, i)))) { /* a non-nil value? */
- setobj2s(key, gkey(gnode(t, i)));
- setobj2s(key+1, gval(gnode(t, i)));
- return 1;
- }
- }
- return 0; /* no more elements */
-}
-
-
-/*
-** {=============================================================
-** Rehash
-** ==============================================================
-*/
-
-
-static void computesizes (int nums[], int ntotal, int *narray, int *nhash) {
- int i;
- int a = nums[0]; /* number of elements smaller than 2^i */
- int na = a; /* number of elements to go to array part */
- int n = (na == 0) ? -1 : 0; /* (log of) optimal size for array part */
- for (i = 1; a < *narray && *narray >= twoto(i-1); i++) {
- if (nums[i] > 0) {
- a += nums[i];
- if (a >= twoto(i-1)) { /* more than half elements in use? */
- n = i;
- na = a;
- }
- }
- }
- lua_assert(na <= *narray && *narray <= ntotal);
- *nhash = ntotal - na;
- *narray = (n == -1) ? 0 : twoto(n);
- lua_assert(na <= *narray && na >= *narray/2);
-}
-
-
-static void numuse (const Table *t, int *narray, int *nhash) {
- int nums[MAXBITS+1];
- int i, lg;
- int totaluse = 0;
- /* count elements in array part */
- for (i=0, lg=0; lg<=MAXBITS; lg++) { /* for each slice [2^(lg-1) to 2^lg) */
- int ttlg = twoto(lg); /* 2^lg */
- if (ttlg > t->sizearray) {
- ttlg = t->sizearray;
- if (i >= ttlg) break;
- }
- nums[lg] = 0;
- for (; i<ttlg; i++) {
- if (!ttisnil(&t->array[i])) {
- nums[lg]++;
- totaluse++;
- }
- }
- }
- for (; lg<=MAXBITS; lg++) nums[lg] = 0; /* reset other counts */
- *narray = totaluse; /* all previous uses were in array part */
- /* count elements in hash part */
- i = sizenode(t);
- while (i--) {
- Node *n = &t->node[i];
- if (!ttisnil(gval(n))) {
- int k = arrayindex(gkey(n));
- if (k >= 0) { /* is `key' an appropriate array index? */
- nums[luaO_log2(k-1)+1]++; /* count as such */
- (*narray)++;
- }
- totaluse++;
- }
- }
- computesizes(nums, totaluse, narray, nhash);
-}
-
-
-static void setarrayvector (lua_State *L, Table *t, int size) {
- int i;
- luaM_reallocvector(L, t->array, t->sizearray, size, TObject);
- for (i=t->sizearray; i<size; i++)
- setnilvalue(&t->array[i]);
- t->sizearray = size;
-}
-
-
-static void setnodevector (lua_State *L, Table *t, int lsize) {
- int i;
- int size = twoto(lsize);
- if (lsize > MAXBITS)
- luaG_runerror(L, "table overflow");
- if (lsize == 0) { /* no elements to hash part? */
- t->node = G(L)->dummynode; /* use common `dummynode' */
- lua_assert(ttisnil(gkey(t->node))); /* assert invariants: */
- lua_assert(ttisnil(gval(t->node)));
- lua_assert(t->node->next == NULL); /* (`dummynode' must be empty) */
- }
- else {
- t->node = luaM_newvector(L, size, Node);
- for (i=0; i<size; i++) {
- t->node[i].next = NULL;
- setnilvalue(gkey(gnode(t, i)));
- setnilvalue(gval(gnode(t, i)));
- }
- }
- t->lsizenode = cast(lu_byte, lsize);
- t->firstfree = gnode(t, size-1); /* first free position to be used */
-}
-
-
-static void resize (lua_State *L, Table *t, int nasize, int nhsize) {
- int i;
- int oldasize = t->sizearray;
- int oldhsize = t->lsizenode;
- Node *nold;
- Node temp[1];
- if (oldhsize)
- nold = t->node; /* save old hash ... */
- else { /* old hash is `dummynode' */
- lua_assert(t->node == G(L)->dummynode);
- temp[0] = t->node[0]; /* copy it to `temp' */
- nold = temp;
- setnilvalue(gkey(G(L)->dummynode)); /* restate invariant */
- setnilvalue(gval(G(L)->dummynode));
- lua_assert(G(L)->dummynode->next == NULL);
- }
- if (nasize > oldasize) /* array part must grow? */
- setarrayvector(L, t, nasize);
- /* create new hash part with appropriate size */
- setnodevector(L, t, nhsize);
- /* re-insert elements */
- if (nasize < oldasize) { /* array part must shrink? */
- t->sizearray = nasize;
- /* re-insert elements from vanishing slice */
- for (i=nasize; i<oldasize; i++) {
- if (!ttisnil(&t->array[i]))
- setobjt2t(luaH_setnum(L, t, i+1), &t->array[i]);
- }
- /* shrink array */
- luaM_reallocvector(L, t->array, oldasize, nasize, TObject);
- }
- /* re-insert elements in hash part */
- for (i = twoto(oldhsize) - 1; i >= 0; i--) {
- Node *old = nold+i;
- if (!ttisnil(gval(old)))
- setobjt2t(luaH_set(L, t, gkey(old)), gval(old));
- }
- if (oldhsize)
- luaM_freearray(L, nold, twoto(oldhsize), Node); /* free old array */
-}
-
-
-static void rehash (lua_State *L, Table *t) {
- int nasize, nhsize;
- numuse(t, &nasize, &nhsize); /* compute new sizes for array and hash parts */
- resize(L, t, nasize, luaO_log2(nhsize)+1);
-}
-
-
-
-/*
-** }=============================================================
-*/
-
-
-Table *luaH_new (lua_State *L, int narray, int lnhash) {
- Table *t = luaM_new(L, Table);
- luaC_link(L, valtogco(t), LUA_TTABLE);
- t->metatable = hvalue(defaultmeta(L));
- t->flags = cast(lu_byte, ~0);
- /* temporary values (kept only if some malloc fails) */
- t->array = NULL;
- t->sizearray = 0;
- t->lsizenode = 0;
- t->node = NULL;
- setarrayvector(L, t, narray);
- setnodevector(L, t, lnhash);
- return t;
-}
-
-
-void luaH_free (lua_State *L, Table *t) {
- if (t->lsizenode)
- luaM_freearray(L, t->node, sizenode(t), Node);
- luaM_freearray(L, t->array, t->sizearray, TObject);
- luaM_freelem(L, t);
-}
-
-
-#if 0
-/*
-** try to remove an element from a hash table; cannot move any element
-** (because gc can call `remove' during a table traversal)
-*/
-void luaH_remove (Table *t, Node *e) {
- Node *mp = luaH_mainposition(t, gkey(e));
- if (e != mp) { /* element not in its main position? */
- while (mp->next != e) mp = mp->next; /* find previous */
- mp->next = e->next; /* remove `e' from its list */
- }
- else {
- if (e->next != NULL) ??
- }
- lua_assert(ttisnil(gval(node)));
- setnilvalue(gkey(e)); /* clear node `e' */
- e->next = NULL;
-}
-#endif
-
-
-/*
-** inserts a new key into a hash table; first, check whether key's main
-** position is free. If not, check whether colliding node is in its main
-** position or not: if it is not, move colliding node to an empty place and
-** put new key in its main position; otherwise (colliding node is in its main
-** position), new key goes to an empty position.
-*/
-static TObject *newkey (lua_State *L, Table *t, const TObject *key) {
- TObject *val;
- Node *mp = luaH_mainposition(t, key);
- if (!ttisnil(gval(mp))) { /* main position is not free? */
- Node *othern = luaH_mainposition(t, gkey(mp)); /* `mp' of colliding node */
- Node *n = t->firstfree; /* get a free place */
- if (othern != mp) { /* is colliding node out of its main position? */
- /* yes; move colliding node into free position */
- while (othern->next != mp) othern = othern->next; /* find previous */
- othern->next = n; /* redo the chain with `n' in place of `mp' */
- *n = *mp; /* copy colliding node into free pos. (mp->next also goes) */
- mp->next = NULL; /* now `mp' is free */
- setnilvalue(gval(mp));
- }
- else { /* colliding node is in its own main position */
- /* new node will go into free position */
- n->next = mp->next; /* chain new position */
- mp->next = n;
- mp = n;
- }
- }
- setobj2t(gkey(mp), key); /* write barrier */
- lua_assert(ttisnil(gval(mp)));
- for (;;) { /* correct `firstfree' */
- if (ttisnil(gkey(t->firstfree)))
- return gval(mp); /* OK; table still has a free place */
- else if (t->firstfree == t->node) break; /* cannot decrement from here */
- else (t->firstfree)--;
- }
- /* no more free places; must create one */
- setbvalue(gval(mp), 0); /* avoid new key being removed */
- rehash(L, t); /* grow table */
- val = cast(TObject *, luaH_get(t, key)); /* get new position */
- lua_assert(ttisboolean(val));
- setnilvalue(val);
- return val;
-}
-
-
-/*
-** generic search function
-*/
-static const TObject *luaH_getany (Table *t, const TObject *key) {
- if (ttisnil(key)) return &luaO_nilobject;
- else {
- Node *n = luaH_mainposition(t, key);
- do { /* check whether `key' is somewhere in the chain */
- if (luaO_rawequalObj(gkey(n), key)) return gval(n); /* that's it */
- else n = n->next;
- } while (n);
- return &luaO_nilobject;
- }
-}
-
-
-/*
-** search function for integers
-*/
-const TObject *luaH_getnum (Table *t, int key) {
- if (1 <= key && key <= t->sizearray)
- return &t->array[key-1];
- else {
- lua_Number nk = cast(lua_Number, key);
- Node *n = hashnum(t, nk);
- do { /* check whether `key' is somewhere in the chain */
- if (ttisnumber(gkey(n)) && nvalue(gkey(n)) == nk)
- return gval(n); /* that's it */
- else n = n->next;
- } while (n);
- return &luaO_nilobject;
- }
-}
-
-
-/*
-** search function for strings
-*/
-const TObject *luaH_getstr (Table *t, TString *key) {
- Node *n = hashstr(t, key);
- do { /* check whether `key' is somewhere in the chain */
- if (ttisstring(gkey(n)) && tsvalue(gkey(n)) == key)
- return gval(n); /* that's it */
- else n = n->next;
- } while (n);
- return &luaO_nilobject;
-}
-
-
-/*
-** main search function
-*/
-const TObject *luaH_get (Table *t, const TObject *key) {
- switch (ttype(key)) {
- case LUA_TSTRING: return luaH_getstr(t, tsvalue(key));
- case LUA_TNUMBER: {
- int k;
- lua_number2int(k, (nvalue(key)));
- if (cast(lua_Number, k) == nvalue(key)) /* is an integer index? */
- return luaH_getnum(t, k); /* use specialized version */
- /* else go through */
- }
- default: return luaH_getany(t, key);
- }
-}
-
-
-TObject *luaH_set (lua_State *L, Table *t, const TObject *key) {
- const TObject *p = luaH_get(t, key);
- t->flags = 0;
- if (p != &luaO_nilobject)
- return cast(TObject *, p);
- else {
- if (ttisnil(key)) luaG_runerror(L, "table index is nil");
- else if (ttisnumber(key) && nvalue(key) != nvalue(key))
- luaG_runerror(L, "table index is NaN");
- return newkey(L, t, key);
- }
-}
-
-
-TObject *luaH_setnum (lua_State *L, Table *t, int key) {
- const TObject *p = luaH_getnum(t, key);
- if (p != &luaO_nilobject)
- return cast(TObject *, p);
- else {
- TObject k;
- setnvalue(&k, cast(lua_Number, key));
- return newkey(L, t, &k);
- }
-}
-
+++ /dev/null
-/*
-** $Id: ltable.h,v 1.44 2003/03/18 12:50:04 roberto Exp $
-** Lua tables (hash)
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ltable_h
-#define ltable_h
-
-#include "lobject.h"
-
-
-#define gnode(t,i) (&(t)->node[i])
-#define gkey(n) (&(n)->i_key)
-#define gval(n) (&(n)->i_val)
-
-
-const TObject *luaH_getnum (Table *t, int key);
-TObject *luaH_setnum (lua_State *L, Table *t, int key);
-const TObject *luaH_getstr (Table *t, TString *key);
-const TObject *luaH_get (Table *t, const TObject *key);
-TObject *luaH_set (lua_State *L, Table *t, const TObject *key);
-Table *luaH_new (lua_State *L, int narray, int lnhash);
-void luaH_free (lua_State *L, Table *t);
-int luaH_next (lua_State *L, Table *t, StkId key);
-
-/* exported only for debugging */
-Node *luaH_mainposition (const Table *t, const TObject *key);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: ltests.c,v 1.158 2003/04/07 14:35:00 roberto Exp $
-** Internal Module for Debugging of the Lua Implementation
-** See Copyright Notice in lua.h
-*/
-
-
-#include <ctype.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define ltests_c
-
-#include "lua.h"
-
-#include "lapi.h"
-#include "lauxlib.h"
-#include "lcode.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lmem.h"
-#include "lopcodes.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "lualib.h"
-
-
-
-/*
-** The whole module only makes sense with LUA_DEBUG on
-*/
-#ifdef LUA_DEBUG
-
-
-#define lua_pushintegral(L,i) lua_pushnumber(L, cast(lua_Number, (i)))
-
-
-static lua_State *lua_state = NULL;
-
-int islocked = 0;
-
-
-#define func_at(L,k) (L->ci->base+(k) - 1)
-
-
-static void setnameval (lua_State *L, const char *name, int val) {
- lua_pushstring(L, name);
- lua_pushintegral(L, val);
- lua_settable(L, -3);
-}
-
-
-/*
-** {======================================================================
-** Controlled version for realloc.
-** =======================================================================
-*/
-
-#define MARK 0x55 /* 01010101 (a nice pattern) */
-
-#ifndef EXTERNMEMCHECK
-/* full memory check */
-#define HEADER (sizeof(L_Umaxalign)) /* ensures maximum alignment for HEADER */
-#define MARKSIZE 16 /* size of marks after each block */
-#define blockhead(b) (cast(char *, b) - HEADER)
-#define setsize(newblock, size) (*cast(size_t *, newblock) = size)
-#define checkblocksize(b, size) (size == (*cast(size_t *, blockhead(b))))
-#define fillmem(mem,size) memset(mem, -MARK, size)
-#else
-/* external memory check: don't do it twice */
-#define HEADER 0
-#define MARKSIZE 0
-#define blockhead(b) (b)
-#define setsize(newblock, size) /* empty */
-#define checkblocksize(b,size) (1)
-#define fillmem(mem,size) /* empty */
-#endif
-
-unsigned long memdebug_numblocks = 0;
-unsigned long memdebug_total = 0;
-unsigned long memdebug_maxmem = 0;
-unsigned long memdebug_memlimit = ULONG_MAX;
-
-
-static void *checkblock (void *block, size_t size) {
- void *b = blockhead(block);
- int i;
- for (i=0;i<MARKSIZE;i++)
- lua_assert(*(cast(char *, b)+HEADER+size+i) == MARK+i); /* corrupted block? */
- return b;
-}
-
-
-static void freeblock (void *block, size_t size) {
- if (block) {
- lua_assert(checkblocksize(block, size));
- block = checkblock(block, size);
- fillmem(block, size+HEADER+MARKSIZE); /* erase block */
- free(block); /* free original block */
- memdebug_numblocks--;
- memdebug_total -= size;
- }
-}
-
-
-void *debug_realloc (void *block, size_t oldsize, size_t size) {
- lua_assert(oldsize == 0 || checkblocksize(block, oldsize));
- /* ISO does not specify what realloc(NULL, 0) does */
- lua_assert(block != NULL || size > 0);
- if (size == 0) {
- freeblock(block, oldsize);
- return NULL;
- }
- else if (size > oldsize && memdebug_total+size-oldsize > memdebug_memlimit)
- return NULL; /* to test memory allocation errors */
- else {
- void *newblock;
- int i;
- size_t realsize = HEADER+size+MARKSIZE;
- size_t commonsize = (oldsize < size) ? oldsize : size;
- if (realsize < size) return NULL; /* overflow! */
- newblock = malloc(realsize); /* alloc a new block */
- if (newblock == NULL) return NULL;
- if (block) {
- memcpy(cast(char *, newblock)+HEADER, block, commonsize);
- freeblock(block, oldsize); /* erase (and check) old copy */
- }
- /* initialize new part of the block with something `weird' */
- fillmem(cast(char *, newblock)+HEADER+commonsize, size-commonsize);
- memdebug_total += size;
- if (memdebug_total > memdebug_maxmem)
- memdebug_maxmem = memdebug_total;
- memdebug_numblocks++;
- setsize(newblock, size);
- for (i=0;i<MARKSIZE;i++)
- *(cast(char *, newblock)+HEADER+size+i) = cast(char, MARK+i);
- return cast(char *, newblock)+HEADER;
- }
-}
-
-
-/* }====================================================================== */
-
-
-
-/*
-** {======================================================
-** Disassembler
-** =======================================================
-*/
-
-
-static char *buildop (Proto *p, int pc, char *buff) {
- Instruction i = p->code[pc];
- OpCode o = GET_OPCODE(i);
- const char *name = luaP_opnames[o];
- int line = getline(p, pc);
- sprintf(buff, "(%4d) %4d - ", line, pc);
- switch (getOpMode(o)) {
- case iABC:
- sprintf(buff+strlen(buff), "%-12s%4d %4d %4d", name,
- GETARG_A(i), GETARG_B(i), GETARG_C(i));
- break;
- case iABx:
- sprintf(buff+strlen(buff), "%-12s%4d %4d", name, GETARG_A(i), GETARG_Bx(i));
- break;
- case iAsBx:
- sprintf(buff+strlen(buff), "%-12s%4d %4d", name, GETARG_A(i), GETARG_sBx(i));
- break;
- }
- return buff;
-}
-
-
-#if 0
-void luaI_printcode (Proto *pt, int size) {
- int pc;
- for (pc=0; pc<size; pc++) {
- char buff[100];
- printf("%s\n", buildop(pt, pc, buff));
- }
- printf("-------\n");
-}
-#endif
-
-
-static int listcode (lua_State *L) {
- int pc;
- Proto *p;
- luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1),
- 1, "Lua function expected");
- p = clvalue(func_at(L, 1))->l.p;
- lua_newtable(L);
- setnameval(L, "maxstack", p->maxstacksize);
- setnameval(L, "numparams", p->numparams);
- for (pc=0; pc<p->sizecode; pc++) {
- char buff[100];
- lua_pushintegral(L, pc+1);
- lua_pushstring(L, buildop(p, pc, buff));
- lua_settable(L, -3);
- }
- return 1;
-}
-
-
-static int listk (lua_State *L) {
- Proto *p;
- int i;
- luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1),
- 1, "Lua function expected");
- p = clvalue(func_at(L, 1))->l.p;
- lua_newtable(L);
- for (i=0; i<p->sizek; i++) {
- lua_pushintegral(L, i+1);
- luaA_pushobject(L, p->k+i);
- lua_settable(L, -3);
- }
- return 1;
-}
-
-
-static int listlocals (lua_State *L) {
- Proto *p;
- int pc = luaL_checkint(L, 2) - 1;
- int i = 0;
- const char *name;
- luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1),
- 1, "Lua function expected");
- p = clvalue(func_at(L, 1))->l.p;
- while ((name = luaF_getlocalname(p, ++i, pc)) != NULL)
- lua_pushstring(L, name);
- return i-1;
-}
-
-/* }====================================================== */
-
-
-
-
-static int get_limits (lua_State *L) {
- lua_newtable(L);
- setnameval(L, "BITS_INT", BITS_INT);
- setnameval(L, "LFPF", LFIELDS_PER_FLUSH);
- setnameval(L, "MAXVARS", MAXVARS);
- setnameval(L, "MAXPARAMS", MAXPARAMS);
- setnameval(L, "MAXSTACK", MAXSTACK);
- setnameval(L, "MAXUPVALUES", MAXUPVALUES);
- return 1;
-}
-
-
-static int mem_query (lua_State *L) {
- if (lua_isnone(L, 1)) {
- lua_pushintegral(L, memdebug_total);
- lua_pushintegral(L, memdebug_numblocks);
- lua_pushintegral(L, memdebug_maxmem);
- return 3;
- }
- else {
- memdebug_memlimit = luaL_checkint(L, 1);
- return 0;
- }
-}
-
-
-static int hash_query (lua_State *L) {
- if (lua_isnone(L, 2)) {
- luaL_argcheck(L, lua_type(L, 1) == LUA_TSTRING, 1, "string expected");
- lua_pushintegral(L, tsvalue(func_at(L, 1))->tsv.hash);
- }
- else {
- TObject *o = func_at(L, 1);
- Table *t;
- luaL_checktype(L, 2, LUA_TTABLE);
- t = hvalue(func_at(L, 2));
- lua_pushintegral(L, luaH_mainposition(t, o) - t->node);
- }
- return 1;
-}
-
-
-static int stacklevel (lua_State *L) {
- unsigned long a = 0;
- lua_pushintegral(L, (int)(L->top - L->stack));
- lua_pushintegral(L, (int)(L->stack_last - L->stack));
- lua_pushintegral(L, (int)(L->ci - L->base_ci));
- lua_pushintegral(L, (int)(L->end_ci - L->base_ci));
- lua_pushintegral(L, (unsigned long)&a);
- return 5;
-}
-
-
-static int table_query (lua_State *L) {
- const Table *t;
- int i = luaL_optint(L, 2, -1);
- luaL_checktype(L, 1, LUA_TTABLE);
- t = hvalue(func_at(L, 1));
- if (i == -1) {
- lua_pushintegral(L, t->sizearray);
- lua_pushintegral(L, sizenode(t));
- lua_pushintegral(L, t->firstfree - t->node);
- }
- else if (i < t->sizearray) {
- lua_pushintegral(L, i);
- luaA_pushobject(L, &t->array[i]);
- lua_pushnil(L);
- }
- else if ((i -= t->sizearray) < sizenode(t)) {
- if (!ttisnil(gval(gnode(t, i))) ||
- ttisnil(gkey(gnode(t, i))) ||
- ttisnumber(gkey(gnode(t, i)))) {
- luaA_pushobject(L, gkey(gnode(t, i)));
- }
- else
- lua_pushstring(L, "<undef>");
- luaA_pushobject(L, gval(gnode(t, i)));
- if (t->node[i].next)
- lua_pushintegral(L, t->node[i].next - t->node);
- else
- lua_pushnil(L);
- }
- return 3;
-}
-
-
-static int string_query (lua_State *L) {
- stringtable *tb = &G(L)->strt;
- int s = luaL_optint(L, 2, 0) - 1;
- if (s==-1) {
- lua_pushintegral(L ,tb->nuse);
- lua_pushintegral(L ,tb->size);
- return 2;
- }
- else if (s < tb->size) {
- GCObject *ts;
- int n = 0;
- for (ts = tb->hash[s]; ts; ts = ts->gch.next) {
- setsvalue2s(L->top, gcotots(ts));
- incr_top(L);
- n++;
- }
- return n;
- }
- return 0;
-}
-
-
-static int tref (lua_State *L) {
- int level = lua_gettop(L);
- int lock = luaL_optint(L, 2, 1);
- luaL_checkany(L, 1);
- lua_pushvalue(L, 1);
- lua_pushintegral(L, lua_ref(L, lock));
- assert(lua_gettop(L) == level+1); /* +1 for result */
- return 1;
-}
-
-static int getref (lua_State *L) {
- int level = lua_gettop(L);
- lua_getref(L, luaL_checkint(L, 1));
- assert(lua_gettop(L) == level+1);
- return 1;
-}
-
-static int unref (lua_State *L) {
- int level = lua_gettop(L);
- lua_unref(L, luaL_checkint(L, 1));
- assert(lua_gettop(L) == level);
- return 0;
-}
-
-static int metatable (lua_State *L) {
- luaL_checkany(L, 1);
- if (lua_isnone(L, 2)) {
- if (lua_getmetatable(L, 1) == 0)
- lua_pushnil(L);
- }
- else {
- lua_settop(L, 2);
- luaL_checktype(L, 2, LUA_TTABLE);
- lua_setmetatable(L, 1);
- }
- return 1;
-}
-
-
-static int upvalue (lua_State *L) {
- int n = luaL_checkint(L, 2);
- luaL_checktype(L, 1, LUA_TFUNCTION);
- if (lua_isnone(L, 3)) {
- const char *name = lua_getupvalue(L, 1, n);
- if (name == NULL) return 0;
- lua_pushstring(L, name);
- return 2;
- }
- else {
- const char *name = lua_setupvalue(L, 1, n);
- lua_pushstring(L, name);
- return 1;
- }
-}
-
-
-static int newuserdata (lua_State *L) {
- size_t size = luaL_checkint(L, 1);
- char *p = cast(char *, lua_newuserdata(L, size));
- while (size--) *p++ = '\0';
- return 1;
-}
-
-
-static int pushuserdata (lua_State *L) {
- lua_pushlightuserdata(L, cast(void *, luaL_checkint(L, 1)));
- return 1;
-}
-
-
-static int udataval (lua_State *L) {
- lua_pushintegral(L, cast(int, lua_touserdata(L, 1)));
- return 1;
-}
-
-
-static int doonnewstack (lua_State *L) {
- lua_State *L1 = lua_newthread(L);
- size_t l;
- const char *s = luaL_checklstring(L, 1, &l);
- int status = luaL_loadbuffer(L1, s, l, s);
- if (status == 0)
- status = lua_pcall(L1, 0, 0, 0);
- lua_pushintegral(L, status);
- return 1;
-}
-
-
-static int s2d (lua_State *L) {
- lua_pushnumber(L, *cast(const double *, luaL_checkstring(L, 1)));
- return 1;
-}
-
-static int d2s (lua_State *L) {
- double d = luaL_checknumber(L, 1);
- lua_pushlstring(L, cast(char *, &d), sizeof(d));
- return 1;
-}
-
-
-static int newstate (lua_State *L) {
- lua_State *L1 = lua_open();
- if (L1) {
- lua_userstateopen(L1); /* init lock */
- lua_pushintegral(L, (unsigned long)L1);
- }
- else
- lua_pushnil(L);
- return 1;
-}
-
-
-static int loadlib (lua_State *L) {
- static const luaL_reg libs[] = {
- {"mathlibopen", luaopen_math},
- {"strlibopen", luaopen_string},
- {"iolibopen", luaopen_io},
- {"tablibopen", luaopen_table},
- {"dblibopen", luaopen_debug},
- {"baselibopen", luaopen_base},
- {NULL, NULL}
- };
- lua_State *L1 = cast(lua_State *,
- cast(unsigned long, luaL_checknumber(L, 1)));
- lua_pushvalue(L1, LUA_GLOBALSINDEX);
- luaL_openlib(L1, NULL, libs, 0);
- return 0;
-}
-
-static int closestate (lua_State *L) {
- lua_State *L1 = cast(lua_State *, cast(unsigned long, luaL_checknumber(L, 1)));
- lua_close(L1);
- lua_unlock(L); /* close cannot unlock that */
- return 0;
-}
-
-static int doremote (lua_State *L) {
- lua_State *L1 = cast(lua_State *,cast(unsigned long,luaL_checknumber(L, 1)));
- size_t lcode;
- const char *code = luaL_checklstring(L, 2, &lcode);
- int status;
- lua_settop(L1, 0);
- status = luaL_loadbuffer(L1, code, lcode, code);
- if (status == 0)
- status = lua_pcall(L1, 0, LUA_MULTRET, 0);
- if (status != 0) {
- lua_pushnil(L);
- lua_pushintegral(L, status);
- lua_pushstring(L, lua_tostring(L1, -1));
- return 3;
- }
- else {
- int i = 0;
- while (!lua_isnone(L1, ++i))
- lua_pushstring(L, lua_tostring(L1, i));
- lua_pop(L1, i-1);
- return i-1;
- }
-}
-
-
-static int log2_aux (lua_State *L) {
- lua_pushintegral(L, luaO_log2(luaL_checkint(L, 1)));
- return 1;
-}
-
-static int int2fb_aux (lua_State *L) {
- int b = luaO_int2fb(luaL_checkint(L, 1));
- lua_pushintegral(L, b);
- lua_pushintegral(L, fb2int(b));
- return 2;
-}
-
-
-static int test_do (lua_State *L) {
- const char *p = luaL_checkstring(L, 1);
- if (*p == '@')
- lua_dofile(L, p+1);
- else
- lua_dostring(L, p);
- return lua_gettop(L);
-}
-
-
-
-/*
-** {======================================================
-** function to test the API with C. It interprets a kind of assembler
-** language with calls to the API, so the test can be driven by Lua code
-** =======================================================
-*/
-
-static const char *const delimits = " \t\n,;";
-
-static void skip (const char **pc) {
- while (**pc != '\0' && strchr(delimits, **pc)) (*pc)++;
-}
-
-static int getnum_aux (lua_State *L, const char **pc) {
- int res = 0;
- int sig = 1;
- skip(pc);
- if (**pc == '.') {
- res = cast(int, lua_tonumber(L, -1));
- lua_pop(L, 1);
- (*pc)++;
- return res;
- }
- else if (**pc == '-') {
- sig = -1;
- (*pc)++;
- }
- while (isdigit(cast(int, **pc))) res = res*10 + (*(*pc)++) - '0';
- return sig*res;
-}
-
-static const char *getname_aux (char *buff, const char **pc) {
- int i = 0;
- skip(pc);
- while (**pc != '\0' && !strchr(delimits, **pc))
- buff[i++] = *(*pc)++;
- buff[i] = '\0';
- return buff;
-}
-
-
-#define EQ(s1) (strcmp(s1, inst) == 0)
-
-#define getnum (getnum_aux(L, &pc))
-#define getname (getname_aux(buff, &pc))
-
-
-static int testC (lua_State *L) {
- char buff[30];
- const char *pc = luaL_checkstring(L, 1);
- for (;;) {
- const char *inst = getname;
- if EQ("") return 0;
- else if EQ("isnumber") {
- lua_pushintegral(L, lua_isnumber(L, getnum));
- }
- else if EQ("isstring") {
- lua_pushintegral(L, lua_isstring(L, getnum));
- }
- else if EQ("istable") {
- lua_pushintegral(L, lua_istable(L, getnum));
- }
- else if EQ("iscfunction") {
- lua_pushintegral(L, lua_iscfunction(L, getnum));
- }
- else if EQ("isfunction") {
- lua_pushintegral(L, lua_isfunction(L, getnum));
- }
- else if EQ("isuserdata") {
- lua_pushintegral(L, lua_isuserdata(L, getnum));
- }
- else if EQ("isudataval") {
- lua_pushintegral(L, lua_islightuserdata(L, getnum));
- }
- else if EQ("isnil") {
- lua_pushintegral(L, lua_isnil(L, getnum));
- }
- else if EQ("isnull") {
- lua_pushintegral(L, lua_isnone(L, getnum));
- }
- else if EQ("tonumber") {
- lua_pushnumber(L, lua_tonumber(L, getnum));
- }
- else if EQ("tostring") {
- const char *s = lua_tostring(L, getnum);
- lua_pushstring(L, s);
- }
- else if EQ("strlen") {
- lua_pushintegral(L, lua_strlen(L, getnum));
- }
- else if EQ("tocfunction") {
- lua_pushcfunction(L, lua_tocfunction(L, getnum));
- }
- else if EQ("return") {
- return getnum;
- }
- else if EQ("gettop") {
- lua_pushintegral(L, lua_gettop(L));
- }
- else if EQ("settop") {
- lua_settop(L, getnum);
- }
- else if EQ("pop") {
- lua_pop(L, getnum);
- }
- else if EQ("pushnum") {
- lua_pushintegral(L, getnum);
- }
- else if EQ("pushnil") {
- lua_pushnil(L);
- }
- else if EQ("pushbool") {
- lua_pushboolean(L, getnum);
- }
- else if EQ("tobool") {
- lua_pushintegral(L, lua_toboolean(L, getnum));
- }
- else if EQ("pushvalue") {
- lua_pushvalue(L, getnum);
- }
- else if EQ("pushcclosure") {
- lua_pushcclosure(L, testC, getnum);
- }
- else if EQ("pushupvalues") {
- lua_pushupvalues(L);
- }
- else if EQ("remove") {
- lua_remove(L, getnum);
- }
- else if EQ("insert") {
- lua_insert(L, getnum);
- }
- else if EQ("replace") {
- lua_replace(L, getnum);
- }
- else if EQ("gettable") {
- lua_gettable(L, getnum);
- }
- else if EQ("settable") {
- lua_settable(L, getnum);
- }
- else if EQ("next") {
- lua_next(L, -2);
- }
- else if EQ("concat") {
- lua_concat(L, getnum);
- }
- else if EQ("lessthan") {
- int a = getnum;
- lua_pushboolean(L, lua_lessthan(L, a, getnum));
- }
- else if EQ("equal") {
- int a = getnum;
- lua_pushboolean(L, lua_equal(L, a, getnum));
- }
- else if EQ("rawcall") {
- int narg = getnum;
- int nres = getnum;
- lua_call(L, narg, nres);
- }
- else if EQ("call") {
- int narg = getnum;
- int nres = getnum;
- lua_pcall(L, narg, nres, 0);
- }
- else if EQ("loadstring") {
- size_t sl;
- const char *s = luaL_checklstring(L, getnum, &sl);
- luaL_loadbuffer(L, s, sl, s);
- }
- else if EQ("loadfile") {
- luaL_loadfile(L, luaL_checkstring(L, getnum));
- }
- else if EQ("setmetatable") {
- lua_setmetatable(L, getnum);
- }
- else if EQ("getmetatable") {
- if (lua_getmetatable(L, getnum) == 0)
- lua_pushnil(L);
- }
- else if EQ("type") {
- lua_pushstring(L, lua_typename(L, lua_type(L, getnum)));
- }
- else if EQ("getn") {
- int i = getnum;
- lua_pushintegral(L, luaL_getn(L, i));
- }
- else if EQ("setn") {
- int i = getnum;
- int n = cast(int, lua_tonumber(L, -1));
- luaL_setn(L, i, n);
- lua_pop(L, 1);
- }
- else luaL_error(L, "unknown instruction %s", buff);
- }
- return 0;
-}
-
-/* }====================================================== */
-
-
-/*
-** {======================================================
-** tests for yield inside hooks
-** =======================================================
-*/
-
-static void yieldf (lua_State *L, lua_Debug *ar) {
- lua_yield(L, 0);
-}
-
-static int setyhook (lua_State *L) {
- if (lua_isnoneornil(L, 1))
- lua_sethook(L, NULL, 0, 0); /* turn off hooks */
- else {
- const char *smask = luaL_checkstring(L, 1);
- int count = luaL_optint(L, 2, 0);
- int mask = 0;
- if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
- if (count > 0) mask |= LUA_MASKCOUNT;
- lua_sethook(L, yieldf, mask, count);
- }
- return 0;
-}
-
-
-static int coresume (lua_State *L) {
- int status;
- lua_State *co = lua_tothread(L, 1);
- luaL_argcheck(L, co, 1, "coroutine expected");
- status = lua_resume(co, 0);
- if (status != 0) {
- lua_pushboolean(L, 0);
- lua_insert(L, -2);
- return 2; /* return false + error message */
- }
- else {
- lua_pushboolean(L, 1);
- return 1;
- }
-}
-
-/* }====================================================== */
-
-
-
-static const struct luaL_reg tests_funcs[] = {
- {"hash", hash_query},
- {"limits", get_limits},
- {"listcode", listcode},
- {"listk", listk},
- {"listlocals", listlocals},
- {"loadlib", loadlib},
- {"stacklevel", stacklevel},
- {"querystr", string_query},
- {"querytab", table_query},
- {"doit", test_do},
- {"testC", testC},
- {"ref", tref},
- {"getref", getref},
- {"unref", unref},
- {"d2s", d2s},
- {"s2d", s2d},
- {"metatable", metatable},
- {"upvalue", upvalue},
- {"newuserdata", newuserdata},
- {"pushuserdata", pushuserdata},
- {"udataval", udataval},
- {"doonnewstack", doonnewstack},
- {"newstate", newstate},
- {"closestate", closestate},
- {"doremote", doremote},
- {"log2", log2_aux},
- {"int2fb", int2fb_aux},
- {"totalmem", mem_query},
- {"resume", coresume},
- {"setyhook", setyhook},
- {NULL, NULL}
-};
-
-
-static void fim (void) {
- if (!islocked)
- lua_close(lua_state);
- lua_assert(memdebug_numblocks == 0);
- lua_assert(memdebug_total == 0);
-}
-
-
-static int l_panic (lua_State *L) {
- UNUSED(L);
- fprintf(stderr, "unable to recover; exiting\n");
- return 0;
-}
-
-
-int luaB_opentests (lua_State *L) {
- lua_atpanic(L, l_panic);
- lua_userstateopen(L); /* init lock */
- lua_state = L; /* keep first state to be opened */
- luaL_openlib(L, "T", tests_funcs, 0);
- atexit(fim);
- return 0;
-}
-
-
-#undef main
-int main (int argc, char *argv[]) {
- char *limit = getenv("MEMLIMIT");
- if (limit)
- memdebug_memlimit = strtoul(limit, NULL, 10);
- l_main(argc, argv);
- return 0;
-}
-
-#endif
+++ /dev/null
-/*
-** $Id: ltm.c,v 1.106 2003/04/03 13:35:34 roberto Exp $
-** Tag methods
-** See Copyright Notice in lua.h
-*/
-
-
-#include <string.h>
-
-#define ltm_c
-
-#include "lua.h"
-
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-
-
-
-const char *const luaT_typenames[] = {
- "nil", "boolean", "userdata", "number",
- "string", "table", "function", "userdata", "thread"
-};
-
-
-void luaT_init (lua_State *L) {
- static const char *const luaT_eventname[] = { /* ORDER TM */
- "__index", "__newindex",
- "__gc", "__mode", "__eq",
- "__add", "__sub", "__mul", "__div",
- "__pow", "__unm", "__lt", "__le",
- "__concat", "__call"
- };
- int i;
- for (i=0; i<TM_N; i++) {
- G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
- luaS_fix(G(L)->tmname[i]); /* never collect these names */
- }
-}
-
-
-/*
-** function to be used with macro "fasttm": optimized for absence of
-** tag methods
-*/
-const TObject *luaT_gettm (Table *events, TMS event, TString *ename) {
- const TObject *tm = luaH_getstr(events, ename);
- lua_assert(event <= TM_EQ);
- if (ttisnil(tm)) { /* no tag method? */
- events->flags |= cast(lu_byte, 1u<<event); /* cache this fact */
- return NULL;
- }
- else return tm;
-}
-
-
-const TObject *luaT_gettmbyobj (lua_State *L, const TObject *o, TMS event) {
- TString *ename = G(L)->tmname[event];
- switch (ttype(o)) {
- case LUA_TTABLE:
- return luaH_getstr(hvalue(o)->metatable, ename);
- case LUA_TUSERDATA:
- return luaH_getstr(uvalue(o)->uv.metatable, ename);
- default:
- return &luaO_nilobject;
- }
-}
-
+++ /dev/null
-/*
-** $Id: ltm.h,v 1.41 2002/11/14 11:51:50 roberto Exp $
-** Tag methods
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ltm_h
-#define ltm_h
-
-
-#include "lobject.h"
-
-
-/*
-* WARNING: if you change the order of this enumeration,
-* grep "ORDER TM"
-*/
-typedef enum {
- TM_INDEX,
- TM_NEWINDEX,
- TM_GC,
- TM_MODE,
- TM_EQ, /* last tag method with `fast' access */
- TM_ADD,
- TM_SUB,
- TM_MUL,
- TM_DIV,
- TM_POW,
- TM_UNM,
- TM_LT,
- TM_LE,
- TM_CONCAT,
- TM_CALL,
- TM_N /* number of elements in the enum */
-} TMS;
-
-
-
-#define gfasttm(g,et,e) \
- (((et)->flags & (1u<<(e))) ? NULL : luaT_gettm(et, e, (g)->tmname[e]))
-
-#define fasttm(l,et,e) gfasttm(G(l), et, e)
-
-
-const TObject *luaT_gettm (Table *events, TMS event, TString *ename);
-const TObject *luaT_gettmbyobj (lua_State *L, const TObject *o, TMS event);
-void luaT_init (lua_State *L);
-
-extern const char *const luaT_typenames[];
-
-#endif
+++ /dev/null
-# makefile for Lua interpreter
-
-LUA= ../..
-
-include $(LUA)/config
-
-EXTRA_DEFS= $(USERCONF)
-OBJS= lua.o
-SRCS= lua.c
-
-T= $(BIN)/lua
-
-all: $T
-
-$T: $(OBJS) $(LIB)/liblua.a $(LIB)/liblualib.a
- $(CC) -o $@ $(MYLDFLAGS) $(OBJS) -L$(LIB) -llua -llualib $(EXTRA_LIBS) $(DLLIB)
-
-$(LIB)/liblua.a:
- cd ..; $(MAKE)
-
-$(LIB)/liblualib.a:
- cd ../lib; $(MAKE)
-
-clean:
- rm -f $(OBJS) $T
-
-co:
- co -q -f -M $(SRCS)
-
-klean: clean
- rm -f $(SRCS)
+++ /dev/null
-This is lua, a sample Lua interpreter.
-It can be used as a batch interpreter and also interactively.
-There are man pages for it in both nroff and html in ../../doc.
-
-Usage: ./lua [options] [script [args]]. Available options are:
- - execute stdin as a file
- -e stat execute string `stat'
- -i enter interactive mode after executing `script'
- -l name load and run library `name'
- -v show version information
- -- stop handling options
-
-This interpreter is suitable for using Lua as a standalone language; it loads
-all standard libraries. For a minimal interpreter, see ../../etc/min.c.
-
-If your application simply exports new functions to Lua (which is common),
-then you can use this interpreter (almost) unmodified, as follows:
-
-* First, define a function
- void myinit (lua_State *L)
- in your own code. In this function, you should do whatever initializations
- are needed by your application, typically exporting your functions to Lua.
- (Of course, you can use any name instead of "myinit".)
-
-* Then, #define lua_userinit(L) to be "openstdlibs(L)+myinit(L)".
- Here, openstdlibs is a function in lua.c that opens all standard libraries.
- If you don't need them, just don't call openstdlibs and open any standard
- libraries that you do need in myinit.
-
-* Finally, remember to link your C code when building lua.
-
-For other customizations, see ../../etc/config.c.
+++ /dev/null
-/*
-** $Id: lua.c,v 1.122 2003/04/03 13:34:42 roberto Exp $
-** Lua stand-alone interpreter
-** See Copyright Notice in lua.h
-*/
-
-
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lua_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-/*
-** generic extra include file
-*/
-#ifdef LUA_USERCONFIG
-#include LUA_USERCONFIG
-#endif
-
-
-/*
-** definition of `isatty'
-*/
-#ifdef _POSIX_C_SOURCE
-#include <unistd.h>
-#define stdin_is_tty() isatty(0)
-#else
-#define stdin_is_tty() 1 /* assume stdin is a tty */
-#endif
-
-
-
-#ifndef PROMPT
-#define PROMPT "> "
-#endif
-
-
-#ifndef PROMPT2
-#define PROMPT2 ">> "
-#endif
-
-#ifndef PROGNAME
-#define PROGNAME "lua"
-#endif
-
-#ifndef lua_userinit
-#define lua_userinit(L) openstdlibs(L)
-#endif
-
-
-#ifndef LUA_EXTRALIBS
-#define LUA_EXTRALIBS /* empty */
-#endif
-
-
-static lua_State *L = NULL;
-
-static const char *progname = PROGNAME;
-
-
-
-static const luaL_reg lualibs[] = {
- {"base", luaopen_base},
- {"table", luaopen_table},
- {"io", luaopen_io},
- {"string", luaopen_string},
- {"math", luaopen_math},
- {"debug", luaopen_debug},
- {"loadlib", luaopen_loadlib},
- /* add your libraries here */
- LUA_EXTRALIBS
- {NULL, NULL}
-};
-
-
-
-static void lstop (lua_State *l, lua_Debug *ar) {
- (void)ar; /* unused arg. */
- lua_sethook(l, NULL, 0, 0);
- luaL_error(l, "interrupted!");
-}
-
-
-static void laction (int i) {
- signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
- terminate process (default action) */
- lua_sethook(L, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
-}
-
-
-static void print_usage (void) {
- fprintf(stderr,
- "usage: %s [options] [script [args]].\n"
- "Available options are:\n"
- " - execute stdin as a file\n"
- " -e stat execute string `stat'\n"
- " -i enter interactive mode after executing `script'\n"
- " -l name load and run library `name'\n"
- " -v show version information\n"
- " -- stop handling options\n" ,
- progname);
-}
-
-
-static void l_message (const char *pname, const char *msg) {
- if (pname) fprintf(stderr, "%s: ", pname);
- fprintf(stderr, "%s\n", msg);
-}
-
-
-static int report (int status) {
- const char *msg;
- if (status) {
- msg = lua_tostring(L, -1);
- if (msg == NULL) msg = "(error with no message)";
- l_message(progname, msg);
- lua_pop(L, 1);
- }
- return status;
-}
-
-
-static int lcall (int narg, int clear) {
- int status;
- int base = lua_gettop(L) - narg; /* function index */
- lua_pushliteral(L, "_TRACEBACK");
- lua_rawget(L, LUA_GLOBALSINDEX); /* get traceback function */
- lua_insert(L, base); /* put it under chunk and args */
- signal(SIGINT, laction);
- status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
- signal(SIGINT, SIG_DFL);
- lua_remove(L, base); /* remove traceback function */
- return status;
-}
-
-
-static void print_version (void) {
- l_message(NULL, LUA_VERSION " " LUA_COPYRIGHT);
-}
-
-
-static void getargs (char *argv[], int n) {
- int i;
- lua_newtable(L);
- for (i=0; argv[i]; i++) {
- lua_pushnumber(L, i - n);
- lua_pushstring(L, argv[i]);
- lua_rawset(L, -3);
- }
- /* arg.n = maximum index in table `arg' */
- lua_pushliteral(L, "n");
- lua_pushnumber(L, i-n-1);
- lua_rawset(L, -3);
-}
-
-
-static int docall (int status) {
- if (status == 0) status = lcall(0, 1);
- return report(status);
-}
-
-
-static int file_input (const char *name) {
- return docall(luaL_loadfile(L, name));
-}
-
-
-static int dostring (const char *s, const char *name) {
- return docall(luaL_loadbuffer(L, s, strlen(s), name));
-}
-
-
-static int load_file (const char *name) {
- lua_pushliteral(L, "require");
- lua_rawget(L, LUA_GLOBALSINDEX);
- if (!lua_isfunction(L, -1)) { /* no `require' defined? */
- lua_pop(L, 1);
- return file_input(name);
- }
- else {
- lua_pushstring(L, name);
- return report(lcall(1, 1));
- }
-}
-
-
-/*
-** this macro can be used by some `history' system to save lines
-** read in manual input
-*/
-#ifndef lua_saveline
-#define lua_saveline(L,line) /* empty */
-#endif
-
-
-/*
-** this macro defines a function to show the prompt and reads the
-** next line for manual input
-*/
-#ifndef lua_readline
-#define lua_readline(L,prompt) readline(L,prompt)
-
-/* maximum length of an input line */
-#ifndef MAXINPUT
-#define MAXINPUT 512
-#endif
-
-
-static int readline (lua_State *l, const char *prompt) {
- static char buffer[MAXINPUT];
- if (prompt) {
- fputs(prompt, stdout);
- fflush(stdout);
- }
- if (fgets(buffer, sizeof(buffer), stdin) == NULL)
- return 0; /* read fails */
- else {
- lua_pushstring(l, buffer);
- return 1;
- }
-}
-
-#endif
-
-
-static const char *get_prompt (int firstline) {
- const char *p = NULL;
- lua_pushstring(L, firstline ? "_PROMPT" : "_PROMPT2");
- lua_rawget(L, LUA_GLOBALSINDEX);
- p = lua_tostring(L, -1);
- if (p == NULL) p = (firstline ? PROMPT : PROMPT2);
- lua_pop(L, 1); /* remove global */
- return p;
-}
-
-
-static int incomplete (int status) {
- if (status == LUA_ERRSYNTAX &&
- strstr(lua_tostring(L, -1), "near `<eof>'") != NULL) {
- lua_pop(L, 1);
- return 1;
- }
- else
- return 0;
-}
-
-
-static int load_string (void) {
- int status;
- lua_settop(L, 0);
- if (lua_readline(L, get_prompt(1)) == 0) /* no input? */
- return -1;
- if (lua_tostring(L, -1)[0] == '=') { /* line starts with `=' ? */
- lua_pushfstring(L, "return %s", lua_tostring(L, -1)+1);/* `=' -> `return' */
- lua_remove(L, -2); /* remove original line */
- }
- for (;;) { /* repeat until gets a complete line */
- status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
- if (!incomplete(status)) break; /* cannot try to add lines? */
- if (lua_readline(L, get_prompt(0)) == 0) /* no more input? */
- return -1;
- lua_concat(L, lua_gettop(L)); /* join lines */
- }
- lua_saveline(L, lua_tostring(L, 1));
- lua_remove(L, 1); /* remove line */
- return status;
-}
-
-
-static void manual_input (void) {
- int status;
- const char *oldprogname = progname;
- progname = NULL;
- while ((status = load_string()) != -1) {
- if (status == 0) status = lcall(0, 0);
- report(status);
- if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
- lua_getglobal(L, "print");
- lua_insert(L, 1);
- if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
- l_message(progname, lua_pushfstring(L, "error calling `print' (%s)",
- lua_tostring(L, -1)));
- }
- }
- lua_settop(L, 0); /* clear stack */
- fputs("\n", stdout);
- progname = oldprogname;
-}
-
-
-static int handle_argv (char *argv[], int *interactive) {
- if (argv[1] == NULL) { /* no more arguments? */
- if (stdin_is_tty()) {
- print_version();
- manual_input();
- }
- else
- file_input(NULL); /* executes stdin as a file */
- }
- else { /* other arguments; loop over them */
- int i;
- for (i = 1; argv[i] != NULL; i++) {
- if (argv[i][0] != '-') break; /* not an option? */
- switch (argv[i][1]) { /* option */
- case '-': { /* `--' */
- if (argv[i][2] != '\0') {
- print_usage();
- return 1;
- }
- i++; /* skip this argument */
- goto endloop; /* stop handling arguments */
- }
- case '\0': {
- file_input(NULL); /* executes stdin as a file */
- break;
- }
- case 'i': {
- *interactive = 1;
- break;
- }
- case 'v': {
- print_version();
- break;
- }
- case 'e': {
- const char *chunk = argv[i] + 2;
- if (*chunk == '\0') chunk = argv[++i];
- if (chunk == NULL) {
- print_usage();
- return 1;
- }
- if (dostring(chunk, "=<command line>") != 0)
- return 1;
- break;
- }
- case 'l': {
- const char *filename = argv[i] + 2;
- if (*filename == '\0') filename = argv[++i];
- if (filename == NULL) {
- print_usage();
- return 1;
- }
- if (load_file(filename))
- return 1; /* stop if file fails */
- break;
- }
- case 'c': {
- l_message(progname, "option `-c' is deprecated");
- break;
- }
- case 's': {
- l_message(progname, "option `-s' is deprecated");
- break;
- }
- default: {
- print_usage();
- return 1;
- }
- }
- } endloop:
- if (argv[i] != NULL) {
- const char *filename = argv[i];
- getargs(argv, i); /* collect arguments */
- lua_setglobal(L, "arg");
- return file_input(filename); /* stop scanning arguments */
- }
- }
- return 0;
-}
-
-
-static void openstdlibs (lua_State *l) {
- const luaL_reg *lib = lualibs;
- for (; lib->func; lib++) {
- lib->func(l); /* open library */
- lua_settop(l, 0); /* discard any results */
- }
-}
-
-
-static int handle_luainit (void) {
- const char *init = getenv("LUA_INIT");
- if (init == NULL) return 0; /* status OK */
- else if (init[0] == '@')
- return file_input(init+1);
- else
- return dostring(init, "=LUA_INIT");
-}
-
-
-struct Smain {
- int argc;
- char **argv;
- int status;
-};
-
-
-static int pmain (lua_State *l) {
- struct Smain *s = (struct Smain *)lua_touserdata(l, 1);
- int status;
- int interactive = 0;
- if (s->argv[0] && s->argv[0][0]) progname = s->argv[0];
- L = l;
- lua_userinit(l); /* open libraries */
- status = handle_luainit();
- if (status == 0) {
- status = handle_argv(s->argv, &interactive);
- if (status == 0 && interactive) manual_input();
- }
- s->status = status;
- return 0;
-}
-
-
-int main (int argc, char *argv[]) {
- int status;
- struct Smain s;
- lua_State *l = lua_open(); /* create state */
- if (l == NULL) {
- l_message(argv[0], "cannot create state: not enough memory");
- return EXIT_FAILURE;
- }
- s.argc = argc;
- s.argv = argv;
- status = lua_cpcall(l, &pmain, &s);
- report(status);
- lua_close(l);
- return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
-}
-
+++ /dev/null
-# makefile for Lua compiler
-
-LUA= ../..
-
-include $(LUA)/config
-
-INCS= -I$(INC) -I.. $(EXTRA_INCS)
-OBJS= luac.o print.o lopcodes.o
-SRCS= luac.c print.c
-
-T= $(BIN)/luac
-
-all: $T
-
-$T: $(OBJS) $(LIB)/liblua.a $(LIB)/liblualib.a
- $(CC) -o $@ $(MYLDFLAGS) $(OBJS) -L$(LIB) -llua -llualib $(EXTRA_LIBS) $(DLLIB)
-
-# print.c needs opcode names from lopcodes.c
-lopcodes.o: ../lopcodes.c ../lopcodes.h
- $(CC) -o $@ -c $(CFLAGS) -DLUA_OPNAMES ../lopcodes.c
-
-$(LIB)/liblua.a:
- cd ..; $(MAKE)
-
-$(LIB)/liblualib.a:
- cd ../lib; $(MAKE)
-
-clean:
- rm -f $(OBJS) $T
-
-co:
- co -q -f -M $(SRCS)
-
-klean: clean
- rm -f $(SRCS)
+++ /dev/null
-This is luac, the Lua compiler.
-There are man pages for it in both nroff and html in ../../doc.
-
-luac translates Lua programs into binary files that can be loaded latter.
-The main advantages of pre-compiling chunks are: faster loading, protecting
-source code from user changes, and off-line syntax error detection.
-luac can also be used to learn about the Lua virtual machine.
-
-Usage: /l/luac/luac [options] [filenames]. Available options are:
- - process stdin
- -l list
- -o name output to file `name' (default is "luac.out")
- -p parse only
- -s strip debug information
- -v show version information
- -- stop handling options
-
-luac is also an example of how to use the internals of Lua (politely).
+++ /dev/null
-/*
-** $Id: luac.c,v 1.44a 2003/04/07 20:34:20 lhf Exp $
-** Lua compiler (saves bytecodes to files; also list bytecodes)
-** See Copyright Notice in lua.h
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "lua.h"
-#include "lauxlib.h"
-
-#include "lfunc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lstring.h"
-#include "lundump.h"
-
-#ifndef LUA_DEBUG
-#define luaB_opentests(L)
-#endif
-
-#ifndef PROGNAME
-#define PROGNAME "luac" /* program name */
-#endif
-
-#define OUTPUT "luac.out" /* default output file */
-
-static int listing=0; /* list bytecodes? */
-static int dumping=1; /* dump bytecodes? */
-static int stripping=0; /* strip debug information? */
-static char Output[]={ OUTPUT }; /* default output file name */
-static const char* output=Output; /* output file name */
-static const char* progname=PROGNAME; /* actual program name */
-
-static void fatal(const char* message)
-{
- fprintf(stderr,"%s: %s\n",progname,message);
- exit(EXIT_FAILURE);
-}
-
-static void cannot(const char* name, const char* what, const char* mode)
-{
- fprintf(stderr,"%s: cannot %s %sput file ",progname,what,mode);
- perror(name);
- exit(EXIT_FAILURE);
-}
-
-static void usage(const char* message, const char* arg)
-{
- if (message!=NULL)
- {
- fprintf(stderr,"%s: ",progname); fprintf(stderr,message,arg); fprintf(stderr,"\n");
- }
- fprintf(stderr,
- "usage: %s [options] [filenames]. Available options are:\n"
- " - process stdin\n"
- " -l list\n"
- " -o name output to file `name' (default is \"" OUTPUT "\")\n"
- " -p parse only\n"
- " -s strip debug information\n"
- " -v show version information\n"
- " -- stop handling options\n",
- progname);
- exit(EXIT_FAILURE);
-}
-
-#define IS(s) (strcmp(argv[i],s)==0)
-
-static int doargs(int argc, char* argv[])
-{
- int i;
- if (argv[0]!=NULL && *argv[0]!=0) progname=argv[0];
- for (i=1; i<argc; i++)
- {
- if (*argv[i]!='-') /* end of options; keep it */
- break;
- else if (IS("--")) /* end of options; skip it */
- {
- ++i;
- break;
- }
- else if (IS("-")) /* end of options; use stdin */
- return i;
- else if (IS("-l")) /* list */
- listing=1;
- else if (IS("-o")) /* output file */
- {
- output=argv[++i];
- if (output==NULL || *output==0) usage("`-o' needs argument",NULL);
- }
- else if (IS("-p")) /* parse only */
- dumping=0;
- else if (IS("-s")) /* strip debug information */
- stripping=1;
- else if (IS("-v")) /* show version */
- {
- printf("%s %s\n",LUA_VERSION,LUA_COPYRIGHT);
- if (argc==2) exit(EXIT_SUCCESS);
- }
- else /* unknown option */
- usage("unrecognized option `%s'",argv[i]);
- }
- if (i==argc && (listing || !dumping))
- {
- dumping=0;
- argv[--i]=Output;
- }
- return i;
-}
-
-static Proto* toproto(lua_State* L, int i)
-{
- const Closure* c=(const Closure*)lua_topointer(L,i);
- return c->l.p;
-}
-
-static Proto* combine(lua_State* L, int n)
-{
- if (n==1)
- return toproto(L,-1);
- else
- {
- int i,pc=0;
- Proto* f=luaF_newproto(L);
- f->source=luaS_newliteral(L,"=(" PROGNAME ")");
- f->maxstacksize=1;
- f->p=luaM_newvector(L,n,Proto*);
- f->sizep=n;
- f->sizecode=2*n+1;
- f->code=luaM_newvector(L,f->sizecode,Instruction);
- for (i=0; i<n; i++)
- {
- f->p[i]=toproto(L,i-n);
- f->code[pc++]=CREATE_ABx(OP_CLOSURE,0,i);
- f->code[pc++]=CREATE_ABC(OP_CALL,0,1,1);
- }
- f->code[pc++]=CREATE_ABC(OP_RETURN,0,1,0);
- return f;
- }
-}
-
-static void strip(lua_State* L, Proto* f)
-{
- int i,n=f->sizep;
- luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
- luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
- luaM_freearray(L, f->upvalues, f->sizeupvalues, TString *);
- f->lineinfo=NULL; f->sizelineinfo=0;
- f->locvars=NULL; f->sizelocvars=0;
- f->upvalues=NULL; f->sizeupvalues=0;
- f->source=luaS_newliteral(L,"=(none)");
- for (i=0; i<n; i++) strip(L,f->p[i]);
-}
-
-static int writer(lua_State* L, const void* p, size_t size, void* u)
-{
- UNUSED(L);
- return fwrite(p,size,1,(FILE*)u)==1;
-}
-
-int main(int argc, char* argv[])
-{
- lua_State* L;
- Proto* f;
- int i=doargs(argc,argv);
- argc-=i; argv+=i;
- if (argc<=0) usage("no input files given",NULL);
- L=lua_open();
- luaB_opentests(L);
- for (i=0; i<argc; i++)
- {
- const char* filename=IS("-") ? NULL : argv[i];
- if (luaL_loadfile(L,filename)!=0) fatal(lua_tostring(L,-1));
- }
- f=combine(L,argc);
- if (listing) luaU_print(f);
- if (dumping)
- {
- FILE* D=fopen(output,"wb");
- if (D==NULL) cannot(output,"open","out");
- if (stripping) strip(L,f);
- lua_lock(L);
- luaU_dump(L,f,writer,D);
- lua_unlock(L);
- if (ferror(D)) cannot(output,"write","out");
- fclose(D);
- }
- lua_close(L);
- return 0;
-}
+++ /dev/null
-/*
-** $Id: print.c,v 1.44 2003/04/07 20:34:20 lhf Exp $
-** print bytecodes
-** See Copyright Notice in lua.h
-*/
-
-#include <stdio.h>
-
-#if 0
-#define DEBUG_PRINT
-#endif
-
-#ifndef LUA_OPNAMES
-#define LUA_OPNAMES
-#endif
-
-#include "ldebug.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lundump.h"
-
-#define Sizeof(x) ((int)sizeof(x))
-#define VOID(p) ((const void*)(p))
-
-static void PrintString(const Proto* f, int n)
-{
- const char* s=svalue(&f->k[n]);
- putchar('"');
- for (; *s; s++)
- {
- switch (*s)
- {
- case '"': printf("\\\""); break;
- case '\a': printf("\\a"); break;
- case '\b': printf("\\b"); break;
- case '\f': printf("\\f"); break;
- case '\n': printf("\\n"); break;
- case '\r': printf("\\r"); break;
- case '\t': printf("\\t"); break;
- case '\v': printf("\\v"); break;
- default: putchar(*s); break;
- }
- }
- putchar('"');
-}
-
-static void PrintConstant(const Proto* f, int i)
-{
- const TObject* o=&f->k[i];
- switch (ttype(o))
- {
- case LUA_TNUMBER:
- printf(LUA_NUMBER_FMT,nvalue(o));
- break;
- case LUA_TSTRING:
- PrintString(f,i);
- break;
- case LUA_TNIL:
- printf("nil");
- break;
- default: /* cannot happen */
- printf("? type=%d",ttype(o));
- break;
- }
-}
-
-static void PrintCode(const Proto* f)
-{
- const Instruction* code=f->code;
- int pc,n=f->sizecode;
- for (pc=0; pc<n; pc++)
- {
- Instruction i=code[pc];
- OpCode o=GET_OPCODE(i);
- int a=GETARG_A(i);
- int b=GETARG_B(i);
- int c=GETARG_C(i);
- int bc=GETARG_Bx(i);
- int sbc=GETARG_sBx(i);
- int line=getline(f,pc);
-#if 0
- printf("%0*lX",Sizeof(i)*2,i);
-#endif
- printf("\t%d\t",pc+1);
- if (line>0) printf("[%d]\t",line); else printf("[-]\t");
- printf("%-9s\t",luaP_opnames[o]);
- switch (getOpMode(o))
- {
- case iABC: printf("%d %d %d",a,b,c); break;
- case iABx: printf("%d %d",a,bc); break;
- case iAsBx: printf("%d %d",a,sbc); break;
- }
- switch (o)
- {
- case OP_LOADK:
- printf("\t; "); PrintConstant(f,bc);
- break;
- case OP_GETUPVAL:
- case OP_SETUPVAL:
- printf("\t; %s", (f->sizeupvalues>0) ? getstr(f->upvalues[b]) : "-");
- break;
- case OP_GETGLOBAL:
- case OP_SETGLOBAL:
- printf("\t; %s",svalue(&f->k[bc]));
- break;
- case OP_GETTABLE:
- case OP_SELF:
- if (c>=MAXSTACK) { printf("\t; "); PrintConstant(f,c-MAXSTACK); }
- break;
- case OP_SETTABLE:
- case OP_ADD:
- case OP_SUB:
- case OP_MUL:
- case OP_DIV:
- case OP_POW:
- case OP_EQ:
- case OP_LT:
- case OP_LE:
- if (b>=MAXSTACK || c>=MAXSTACK)
- {
- printf("\t; ");
- if (b>=MAXSTACK) PrintConstant(f,b-MAXSTACK); else printf("-");
- printf(" ");
- if (c>=MAXSTACK) PrintConstant(f,c-MAXSTACK);
- }
- break;
- case OP_JMP:
- case OP_FORLOOP:
- case OP_TFORPREP:
- printf("\t; to %d",sbc+pc+2);
- break;
- case OP_CLOSURE:
- printf("\t; %p",VOID(f->p[bc]));
- break;
- default:
- break;
- }
- printf("\n");
- }
-}
-
-static const char* Source(const Proto* f)
-{
- const char* s=getstr(f->source);
- if (*s=='@' || *s=='=')
- return s+1;
- else if (*s==LUA_SIGNATURE[0])
- return "(bstring)";
- else
- return "(string)";
-}
-
-#define IsMain(f) (f->lineDefined==0)
-
-#define SS(x) (x==1)?"":"s"
-#define S(x) x,SS(x)
-
-static void PrintHeader(const Proto* f)
-{
- printf("\n%s <%s:%d> (%d instruction%s, %d bytes at %p)\n",
- IsMain(f)?"main":"function",Source(f),f->lineDefined,
- S(f->sizecode),f->sizecode*Sizeof(Instruction),VOID(f));
- printf("%d%s param%s, %d stack%s, %d upvalue%s, ",
- f->numparams,f->is_vararg?"+":"",SS(f->numparams),S(f->maxstacksize),
- S(f->nups));
- printf("%d local%s, %d constant%s, %d function%s\n",
- S(f->sizelocvars),S(f->sizek),S(f->sizep));
-}
-
-#ifdef DEBUG_PRINT
-static void PrintConstants(const Proto* f)
-{
- int i,n=f->sizek;
- printf("constants (%d) for %p:\n",n,VOID(f));
- for (i=0; i<n; i++)
- {
- printf("\t%d\t",i);
- PrintConstant(f,i);
- printf("\n");
- }
-}
-
-static void PrintLocals(const Proto* f)
-{
- int i,n=f->sizelocvars;
- printf("locals (%d) for %p:\n",n,VOID(f));
- for (i=0; i<n; i++)
- {
- printf("\t%d\t%s\t%d\t%d\n",
- i,getstr(f->locvars[i].varname),f->locvars[i].startpc,f->locvars[i].endpc);
- }
-}
-
-static void PrintUpvalues(const Proto* f)
-{
- int i,n=f->sizeupvalues;
- printf("upvalues (%d) for %p:\n",n,VOID(f));
- if (f->upvalues==NULL) return;
- for (i=0; i<n; i++)
- {
- printf("\t%d\t%s\n",i,getstr(f->upvalues[i]));
- }
-}
-#endif
-
-void luaU_print(const Proto* f)
-{
- int i,n=f->sizep;
- PrintHeader(f);
- PrintCode(f);
-#ifdef DEBUG_PRINT
- PrintConstants(f);
- PrintLocals(f);
- PrintUpvalues(f);
-#endif
- for (i=0; i<n; i++) luaU_print(f->p[i]);
-}
+++ /dev/null
-/*
-** $Id: lundump.c,v 1.49 2003/04/07 20:34:20 lhf Exp $
-** load pre-compiled Lua chunks
-** See Copyright Notice in lua.h
-*/
-
-#define lundump_c
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "lfunc.h"
-#include "lmem.h"
-#include "lopcodes.h"
-#include "lstring.h"
-#include "lundump.h"
-#include "lzio.h"
-
-#define LoadByte (lu_byte) ezgetc
-
-typedef struct {
- lua_State* L;
- ZIO* Z;
- Mbuffer* b;
- int swap;
- const char* name;
-} LoadState;
-
-static void unexpectedEOZ (LoadState* S)
-{
- luaG_runerror(S->L,"unexpected end of file in %s",S->name);
-}
-
-static int ezgetc (LoadState* S)
-{
- int c=zgetc(S->Z);
- if (c==EOZ) unexpectedEOZ(S);
- return c;
-}
-
-static void ezread (LoadState* S, void* b, int n)
-{
- int r=luaZ_read(S->Z,b,n);
- if (r!=0) unexpectedEOZ(S);
-}
-
-static void LoadBlock (LoadState* S, void* b, size_t size)
-{
- if (S->swap)
- {
- char* p=(char*) b+size-1;
- int n=size;
- while (n--) *p--=(char)ezgetc(S);
- }
- else
- ezread(S,b,size);
-}
-
-static void LoadVector (LoadState* S, void* b, int m, size_t size)
-{
- if (S->swap)
- {
- char* q=(char*) b;
- while (m--)
- {
- char* p=q+size-1;
- int n=size;
- while (n--) *p--=(char)ezgetc(S);
- q+=size;
- }
- }
- else
- ezread(S,b,m*size);
-}
-
-static int LoadInt (LoadState* S)
-{
- int x;
- LoadBlock(S,&x,sizeof(x));
- if (x<0) luaG_runerror(S->L,"bad integer in %s",S->name);
- return x;
-}
-
-static size_t LoadSize (LoadState* S)
-{
- size_t x;
- LoadBlock(S,&x,sizeof(x));
- return x;
-}
-
-static lua_Number LoadNumber (LoadState* S)
-{
- lua_Number x;
- LoadBlock(S,&x,sizeof(x));
- return x;
-}
-
-static TString* LoadString (LoadState* S)
-{
- size_t size=LoadSize(S);
- if (size==0)
- return NULL;
- else
- {
- char* s=luaZ_openspace(S->L,S->b,size);
- ezread(S,s,size);
- return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
- }
-}
-
-static void LoadCode (LoadState* S, Proto* f)
-{
- int size=LoadInt(S);
- f->code=luaM_newvector(S->L,size,Instruction);
- f->sizecode=size;
- LoadVector(S,f->code,size,sizeof(*f->code));
-}
-
-static void LoadLocals (LoadState* S, Proto* f)
-{
- int i,n;
- n=LoadInt(S);
- f->locvars=luaM_newvector(S->L,n,LocVar);
- f->sizelocvars=n;
- for (i=0; i<n; i++)
- {
- f->locvars[i].varname=LoadString(S);
- f->locvars[i].startpc=LoadInt(S);
- f->locvars[i].endpc=LoadInt(S);
- }
-}
-
-static void LoadLines (LoadState* S, Proto* f)
-{
- int size=LoadInt(S);
- f->lineinfo=luaM_newvector(S->L,size,int);
- f->sizelineinfo=size;
- LoadVector(S,f->lineinfo,size,sizeof(*f->lineinfo));
-}
-
-static void LoadUpvalues (LoadState* S, Proto* f)
-{
- int i,n;
- n=LoadInt(S);
- if (n!=0 && n!=f->nups)
- luaG_runerror(S->L,"bad nupvalues in %s: read %d; expected %d",
- S->name,n,f->nups);
- f->upvalues=luaM_newvector(S->L,n,TString*);
- f->sizeupvalues=n;
- for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
-}
-
-static Proto* LoadFunction (LoadState* S, TString* p);
-
-static void LoadConstants (LoadState* S, Proto* f)
-{
- int i,n;
- n=LoadInt(S);
- f->k=luaM_newvector(S->L,n,TObject);
- f->sizek=n;
- for (i=0; i<n; i++)
- {
- TObject* o=&f->k[i];
- int t=LoadByte(S);
- switch (t)
- {
- case LUA_TNUMBER:
- setnvalue(o,LoadNumber(S));
- break;
- case LUA_TSTRING:
- setsvalue2n(o,LoadString(S));
- break;
- case LUA_TNIL:
- setnilvalue(o);
- break;
- default:
- luaG_runerror(S->L,"bad constant type (%d) in %s",t,S->name);
- break;
- }
- }
- n=LoadInt(S);
- f->p=luaM_newvector(S->L,n,Proto*);
- f->sizep=n;
- for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
-}
-
-static Proto* LoadFunction (LoadState* S, TString* p)
-{
- Proto* f=luaF_newproto(S->L);
- f->source=LoadString(S); if (f->source==NULL) f->source=p;
- f->lineDefined=LoadInt(S);
- f->nups=LoadByte(S);
- f->numparams=LoadByte(S);
- f->is_vararg=LoadByte(S);
- f->maxstacksize=LoadByte(S);
- LoadLines(S,f);
- LoadLocals(S,f);
- LoadUpvalues(S,f);
- LoadConstants(S,f);
- LoadCode(S,f);
-#ifndef TRUST_BINARIES
- if (!luaG_checkcode(f)) luaG_runerror(S->L,"bad code in %s",S->name);
-#endif
- return f;
-}
-
-static void LoadSignature (LoadState* S)
-{
- const char* s=LUA_SIGNATURE;
- while (*s!=0 && ezgetc(S)==*s)
- ++s;
- if (*s!=0) luaG_runerror(S->L,"bad signature in %s",S->name);
-}
-
-static void TestSize (LoadState* S, int s, const char* what)
-{
- int r=LoadByte(S);
- if (r!=s)
- luaG_runerror(S->L,"virtual machine mismatch in %s: "
- "size of %s is %d but read %d",S->name,what,s,r);
-}
-
-#define TESTSIZE(s,w) TestSize(S,s,w)
-#define V(v) v/16,v%16
-
-static void LoadHeader (LoadState* S)
-{
- int version;
- lua_Number x,tx=TEST_NUMBER;
- LoadSignature(S);
- version=LoadByte(S);
- if (version>VERSION)
- luaG_runerror(S->L,"%s too new: "
- "read version %d.%d; expected at most %d.%d",
- S->name,V(version),V(VERSION));
- if (version<VERSION0) /* check last major change */
- luaG_runerror(S->L,"%s too old: "
- "read version %d.%d; expected at least %d.%d",
- S->name,V(version),V(VERSION0));
- S->swap=(luaU_endianness()!=LoadByte(S)); /* need to swap bytes? */
- TESTSIZE(sizeof(int),"int");
- TESTSIZE(sizeof(size_t), "size_t");
- TESTSIZE(sizeof(Instruction), "Instruction");
- TESTSIZE(SIZE_OP, "OP");
- TESTSIZE(SIZE_A, "A");
- TESTSIZE(SIZE_B, "B");
- TESTSIZE(SIZE_C, "C");
- TESTSIZE(sizeof(lua_Number), "number");
- x=LoadNumber(S);
- if ((long)x!=(long)tx) /* disregard errors in last bits of fraction */
- luaG_runerror(S->L,"unknown number format in %s",S->name);
-}
-
-static Proto* LoadChunk (LoadState* S)
-{
- LoadHeader(S);
- return LoadFunction(S,NULL);
-}
-
-/*
-** load precompiled chunk
-*/
-Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff)
-{
- LoadState S;
- const char* s=zname(Z);
- if (*s=='@' || *s=='=')
- S.name=s+1;
- else if (*s==LUA_SIGNATURE[0])
- S.name="binary string";
- else
- S.name=s;
- S.L=L;
- S.Z=Z;
- S.b=buff;
- return LoadChunk(&S);
-}
-
-/*
-** find byte order
-*/
-int luaU_endianness (void)
-{
- int x=1;
- return *(char*)&x;
-}
+++ /dev/null
-/*
-** $Id: lundump.h,v 1.30 2003/04/07 20:34:20 lhf Exp $
-** load pre-compiled Lua chunks
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lundump_h
-#define lundump_h
-
-#include "lobject.h"
-#include "lzio.h"
-
-/* load one chunk; from lundump.c */
-Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff);
-
-/* find byte order; from lundump.c */
-int luaU_endianness (void);
-
-/* dump one chunk; from ldump.c */
-void luaU_dump (lua_State* L, const Proto* Main, lua_Chunkwriter w, void* data);
-
-/* print one chunk; from print.c */
-void luaU_print (const Proto* Main);
-
-/* definitions for headers of binary files */
-#define LUA_SIGNATURE "\033Lua" /* binary files start with "<esc>Lua" */
-#define VERSION 0x50 /* last format change was in 5.0 */
-#define VERSION0 0x50 /* last major change was in 5.0 */
-
-/* a multiple of PI for testing native format */
-/* multiplying by 1E7 gives non-trivial integer values */
-#define TEST_NUMBER ((lua_Number)3.14159265358979323846E7)
-
-#endif
+++ /dev/null
-/*
-** $Id: lvm.c,v 1.284b 2003/04/03 13:35:34 roberto Exp $
-** Lua virtual machine
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdarg.h>
-#include <stdlib.h>
-#include <string.h>
-
-/* needed only when `lua_number2str' uses `sprintf' */
-#include <stdio.h>
-
-#define lvm_c
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lvm.h"
-
-
-
-/* function to convert a lua_Number to a string */
-#ifndef lua_number2str
-#define lua_number2str(s,n) sprintf((s), LUA_NUMBER_FMT, (n))
-#endif
-
-
-/* limit for table tag-method chains (to avoid loops) */
-#define MAXTAGLOOP 100
-
-
-const TObject *luaV_tonumber (const TObject *obj, TObject *n) {
- lua_Number num;
- if (ttisnumber(obj)) return obj;
- if (ttisstring(obj) && luaO_str2d(svalue(obj), &num)) {
- setnvalue(n, num);
- return n;
- }
- else
- return NULL;
-}
-
-
-int luaV_tostring (lua_State *L, StkId obj) {
- if (!ttisnumber(obj))
- return 0;
- else {
- char s[32]; /* 16 digits, sign, point and \0 (+ some extra...) */
- lua_number2str(s, nvalue(obj));
- setsvalue2s(obj, luaS_new(L, s));
- return 1;
- }
-}
-
-
-static void traceexec (lua_State *L) {
- lu_byte mask = L->hookmask;
- if (mask & LUA_MASKCOUNT) { /* instruction-hook set? */
- if (L->hookcount == 0) {
- resethookcount(L);
- luaD_callhook(L, LUA_HOOKCOUNT, -1);
- return;
- }
- }
- if (mask & LUA_MASKLINE) {
- CallInfo *ci = L->ci;
- Proto *p = ci_func(ci)->l.p;
- int newline = getline(p, pcRel(*ci->u.l.pc, p));
- if (!L->hookinit) {
- luaG_inithooks(L);
- return;
- }
- lua_assert(ci->state & CI_HASFRAME);
- if (pcRel(*ci->u.l.pc, p) == 0) /* tracing may be starting now? */
- ci->u.l.savedpc = *ci->u.l.pc; /* initialize `savedpc' */
- /* calls linehook when enters a new line or jumps back (loop) */
- if (*ci->u.l.pc <= ci->u.l.savedpc ||
- newline != getline(p, pcRel(ci->u.l.savedpc, p))) {
- luaD_callhook(L, LUA_HOOKLINE, newline);
- ci = L->ci; /* previous call may reallocate `ci' */
- }
- ci->u.l.savedpc = *ci->u.l.pc;
- }
-}
-
-
-static void callTMres (lua_State *L, const TObject *f,
- const TObject *p1, const TObject *p2) {
- setobj2s(L->top, f); /* push function */
- setobj2s(L->top+1, p1); /* 1st argument */
- setobj2s(L->top+2, p2); /* 2nd argument */
- luaD_checkstack(L, 3); /* cannot check before (could invalidate p1, p2) */
- L->top += 3;
- luaD_call(L, L->top - 3, 1);
- L->top--; /* result will be in L->top */
-}
-
-
-
-static void callTM (lua_State *L, const TObject *f,
- const TObject *p1, const TObject *p2, const TObject *p3) {
- setobj2s(L->top, f); /* push function */
- setobj2s(L->top+1, p1); /* 1st argument */
- setobj2s(L->top+2, p2); /* 2nd argument */
- setobj2s(L->top+3, p3); /* 3th argument */
- luaD_checkstack(L, 4); /* cannot check before (could invalidate p1...p3) */
- L->top += 4;
- luaD_call(L, L->top - 4, 0);
-}
-
-
-static const TObject *luaV_index (lua_State *L, const TObject *t,
- TObject *key, int loop) {
- const TObject *tm = fasttm(L, hvalue(t)->metatable, TM_INDEX);
- if (tm == NULL) return &luaO_nilobject; /* no TM */
- if (ttisfunction(tm)) {
- callTMres(L, tm, t, key);
- return L->top;
- }
- else return luaV_gettable(L, tm, key, loop);
-}
-
-static const TObject *luaV_getnotable (lua_State *L, const TObject *t,
- TObject *key, int loop) {
- const TObject *tm = luaT_gettmbyobj(L, t, TM_INDEX);
- if (ttisnil(tm))
- luaG_typeerror(L, t, "index");
- if (ttisfunction(tm)) {
- callTMres(L, tm, t, key);
- return L->top;
- }
- else return luaV_gettable(L, tm, key, loop);
-}
-
-
-/*
-** Function to index a table.
-** Receives the table at `t' and the key at `key'.
-** leaves the result at `res'.
-*/
-const TObject *luaV_gettable (lua_State *L, const TObject *t, TObject *key,
- int loop) {
- if (loop > MAXTAGLOOP)
- luaG_runerror(L, "loop in gettable");
- if (ttistable(t)) { /* `t' is a table? */
- Table *h = hvalue(t);
- const TObject *v = luaH_get(h, key); /* do a primitive get */
- if (!ttisnil(v)) return v;
- else return luaV_index(L, t, key, loop+1);
- }
- else return luaV_getnotable(L, t, key, loop+1);
-}
-
-
-/*
-** Receives table at `t', key at `key' and value at `val'.
-*/
-void luaV_settable (lua_State *L, const TObject *t, TObject *key, StkId val) {
- const TObject *tm;
- int loop = 0;
- do {
- if (ttistable(t)) { /* `t' is a table? */
- Table *h = hvalue(t);
- TObject *oldval = luaH_set(L, h, key); /* do a primitive set */
- if (!ttisnil(oldval) || /* result is no nil? */
- (tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
- setobj2t(oldval, val); /* write barrier */
- return;
- }
- /* else will try the tag method */
- }
- else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
- luaG_typeerror(L, t, "index");
- if (ttisfunction(tm)) {
- callTM(L, tm, t, key, val);
- return;
- }
- t = tm; /* else repeat with `tm' */
- } while (++loop <= MAXTAGLOOP);
- luaG_runerror(L, "loop in settable");
-}
-
-
-static int call_binTM (lua_State *L, const TObject *p1, const TObject *p2,
- StkId res, TMS event) {
- ptrdiff_t result = savestack(L, res);
- const TObject *tm = luaT_gettmbyobj(L, p1, event); /* try first operand */
- if (ttisnil(tm))
- tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
- if (!ttisfunction(tm)) return 0;
- callTMres(L, tm, p1, p2);
- res = restorestack(L, result); /* previous call may change stack */
- setobjs2s(res, L->top);
- return 1;
-}
-
-
-static const TObject *get_compTM (lua_State *L, Table *mt1, Table *mt2,
- TMS event) {
- const TObject *tm1 = fasttm(L, mt1, event);
- const TObject *tm2;
- if (tm1 == NULL) return NULL; /* no metamethod */
- if (mt1 == mt2) return tm1; /* same metatables => same metamethods */
- tm2 = fasttm(L, mt2, event);
- if (tm2 == NULL) return NULL; /* no metamethod */
- if (luaO_rawequalObj(tm1, tm2)) /* same metamethods? */
- return tm1;
- return NULL;
-}
-
-
-static int call_orderTM (lua_State *L, const TObject *p1, const TObject *p2,
- TMS event) {
- const TObject *tm1 = luaT_gettmbyobj(L, p1, event);
- const TObject *tm2;
- if (ttisnil(tm1)) return -1; /* no metamethod? */
- tm2 = luaT_gettmbyobj(L, p2, event);
- if (!luaO_rawequalObj(tm1, tm2)) /* different metamethods? */
- return -1;
- callTMres(L, tm1, p1, p2);
- return !l_isfalse(L->top);
-}
-
-
-static int luaV_strcmp (const TString *ls, const TString *rs) {
- const char *l = getstr(ls);
- size_t ll = ls->tsv.len;
- const char *r = getstr(rs);
- size_t lr = rs->tsv.len;
- for (;;) {
- int temp = strcoll(l, r);
- if (temp != 0) return temp;
- else { /* strings are equal up to a `\0' */
- size_t len = strlen(l); /* index of first `\0' in both strings */
- if (len == lr) /* r is finished? */
- return (len == ll) ? 0 : 1;
- else if (len == ll) /* l is finished? */
- return -1; /* l is smaller than r (because r is not finished) */
- /* both strings longer than `len'; go on comparing (after the `\0') */
- len++;
- l += len; ll -= len; r += len; lr -= len;
- }
- }
-}
-
-
-int luaV_lessthan (lua_State *L, const TObject *l, const TObject *r) {
- int res;
- if (ttype(l) != ttype(r))
- return luaG_ordererror(L, l, r);
- else if (ttisnumber(l))
- return nvalue(l) < nvalue(r);
- else if (ttisstring(l))
- return luaV_strcmp(tsvalue(l), tsvalue(r)) < 0;
- else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
- return res;
- return luaG_ordererror(L, l, r);
-}
-
-
-static int luaV_lessequal (lua_State *L, const TObject *l, const TObject *r) {
- int res;
- if (ttype(l) != ttype(r))
- return luaG_ordererror(L, l, r);
- else if (ttisnumber(l))
- return nvalue(l) <= nvalue(r);
- else if (ttisstring(l))
- return luaV_strcmp(tsvalue(l), tsvalue(r)) <= 0;
- else if ((res = call_orderTM(L, l, r, TM_LE)) != -1) /* first try `le' */
- return res;
- else if ((res = call_orderTM(L, r, l, TM_LT)) != -1) /* else try `lt' */
- return !res;
- return luaG_ordererror(L, l, r);
-}
-
-
-int luaV_equalval (lua_State *L, const TObject *t1, const TObject *t2) {
- const TObject *tm;
- lua_assert(ttype(t1) == ttype(t2));
- switch (ttype(t1)) {
- case LUA_TNIL: return 1;
- case LUA_TNUMBER: return nvalue(t1) == nvalue(t2);
- case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2); /* true must be 1 !! */
- case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
- case LUA_TUSERDATA: {
- if (uvalue(t1) == uvalue(t2)) return 1;
- tm = get_compTM(L, uvalue(t1)->uv.metatable, uvalue(t2)->uv.metatable,
- TM_EQ);
- break; /* will try TM */
- }
- case LUA_TTABLE: {
- if (hvalue(t1) == hvalue(t2)) return 1;
- tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
- break; /* will try TM */
- }
- default: return gcvalue(t1) == gcvalue(t2);
- }
- if (tm == NULL) return 0; /* no TM? */
- callTMres(L, tm, t1, t2); /* call TM */
- return !l_isfalse(L->top);
-}
-
-
-void luaV_concat (lua_State *L, int total, int last) {
- do {
- StkId top = L->base + last + 1;
- int n = 2; /* number of elements handled in this pass (at least 2) */
- if (!tostring(L, top-2) || !tostring(L, top-1)) {
- if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
- luaG_concaterror(L, top-2, top-1);
- } else if (tsvalue(top-1)->tsv.len > 0) { /* if len=0, do nothing */
- /* at least two string values; get as many as possible */
- lu_mem tl = cast(lu_mem, tsvalue(top-1)->tsv.len) +
- cast(lu_mem, tsvalue(top-2)->tsv.len);
- char *buffer;
- int i;
- while (n < total && tostring(L, top-n-1)) { /* collect total length */
- tl += tsvalue(top-n-1)->tsv.len;
- n++;
- }
- if (tl > MAX_SIZET) luaG_runerror(L, "string size overflow");
- buffer = luaZ_openspace(L, &G(L)->buff, tl);
- tl = 0;
- for (i=n; i>0; i--) { /* concat all strings */
- size_t l = tsvalue(top-i)->tsv.len;
- memcpy(buffer+tl, svalue(top-i), l);
- tl += l;
- }
- setsvalue2s(top-n, luaS_newlstr(L, buffer, tl));
- }
- total -= n-1; /* got `n' strings to create 1 new */
- last -= n-1;
- } while (total > 1); /* repeat until only 1 result left */
-}
-
-
-static void Arith (lua_State *L, StkId ra,
- const TObject *rb, const TObject *rc, TMS op) {
- TObject tempb, tempc;
- const TObject *b, *c;
- if ((b = luaV_tonumber(rb, &tempb)) != NULL &&
- (c = luaV_tonumber(rc, &tempc)) != NULL) {
- switch (op) {
- case TM_ADD: setnvalue(ra, nvalue(b) + nvalue(c)); break;
- case TM_SUB: setnvalue(ra, nvalue(b) - nvalue(c)); break;
- case TM_MUL: setnvalue(ra, nvalue(b) * nvalue(c)); break;
- case TM_DIV: setnvalue(ra, nvalue(b) / nvalue(c)); break;
- case TM_POW: {
- const TObject *f = luaH_getstr(hvalue(gt(L)), G(L)->tmname[TM_POW]);
- ptrdiff_t res = savestack(L, ra);
- if (!ttisfunction(f))
- luaG_runerror(L, "`__pow' (`^' operator) is not a function");
- callTMres(L, f, b, c);
- ra = restorestack(L, res); /* previous call may change stack */
- setobjs2s(ra, L->top);
- break;
- }
- default: lua_assert(0); break;
- }
- }
- else if (!call_binTM(L, rb, rc, ra, op))
- luaG_aritherror(L, rb, rc);
-}
-
-
-
-/*
-** some macros for common tasks in `luaV_execute'
-*/
-
-#define runtime_check(L, c) { if (!(c)) return 0; }
-
-#define RA(i) (base+GETARG_A(i))
-/* to be used after possible stack reallocation */
-#define XRA(i) (L->base+GETARG_A(i))
-#define RB(i) (base+GETARG_B(i))
-#define RKB(i) ((GETARG_B(i) < MAXSTACK) ? RB(i) : k+GETARG_B(i)-MAXSTACK)
-#define RC(i) (base+GETARG_C(i))
-#define RKC(i) ((GETARG_C(i) < MAXSTACK) ? RC(i) : k+GETARG_C(i)-MAXSTACK)
-#define KBx(i) (k+GETARG_Bx(i))
-
-
-#define dojump(pc, i) ((pc) += (i))
-
-
-StkId luaV_execute (lua_State *L) {
- LClosure *cl;
- TObject *k;
- const Instruction *pc;
- callentry: /* entry point when calling new functions */
- if (L->hookmask & LUA_MASKCALL) {
- L->ci->u.l.pc = &pc;
- luaD_callhook(L, LUA_HOOKCALL, -1);
- }
- retentry: /* entry point when returning to old functions */
- L->ci->u.l.pc = &pc;
- lua_assert(L->ci->state == CI_SAVEDPC ||
- L->ci->state == (CI_SAVEDPC | CI_CALLING));
- L->ci->state = CI_HASFRAME; /* activate frame */
- pc = L->ci->u.l.savedpc;
- cl = &clvalue(L->base - 1)->l;
- k = cl->p->k;
- /* main loop of interpreter */
- for (;;) {
- const Instruction i = *pc++;
- StkId base, ra;
- if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
- (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
- traceexec(L);
- if (L->ci->state & CI_YIELD) { /* did hook yield? */
- L->ci->u.l.savedpc = pc - 1;
- L->ci->state = CI_YIELD | CI_SAVEDPC;
- return NULL;
- }
- }
- /* warning!! several calls may realloc the stack and invalidate `ra' */
- base = L->base;
- ra = RA(i);
- lua_assert(L->ci->state & CI_HASFRAME);
- lua_assert(base == L->ci->base);
- lua_assert(L->top <= L->stack + L->stacksize && L->top >= base);
- lua_assert(L->top == L->ci->top ||
- GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL ||
- GET_OPCODE(i) == OP_RETURN || GET_OPCODE(i) == OP_SETLISTO);
- switch (GET_OPCODE(i)) {
- case OP_MOVE: {
- setobjs2s(ra, RB(i));
- break;
- }
- case OP_LOADK: {
- setobj2s(ra, KBx(i));
- break;
- }
- case OP_LOADBOOL: {
- setbvalue(ra, GETARG_B(i));
- if (GETARG_C(i)) pc++; /* skip next instruction (if C) */
- break;
- }
- case OP_LOADNIL: {
- TObject *rb = RB(i);
- do {
- setnilvalue(rb--);
- } while (rb >= ra);
- break;
- }
- case OP_GETUPVAL: {
- int b = GETARG_B(i);
- setobj2s(ra, cl->upvals[b]->v);
- break;
- }
- case OP_GETGLOBAL: {
- TObject *rb = KBx(i);
- const TObject *v;
- lua_assert(ttisstring(rb) && ttistable(&cl->g));
- v = luaH_getstr(hvalue(&cl->g), tsvalue(rb));
- if (!ttisnil(v)) { setobj2s(ra, v); }
- else
- setobj2s(XRA(i), luaV_index(L, &cl->g, rb, 0));
- break;
- }
- case OP_GETTABLE: {
- StkId rb = RB(i);
- TObject *rc = RKC(i);
- if (ttistable(rb)) {
- const TObject *v = luaH_get(hvalue(rb), rc);
- if (!ttisnil(v)) { setobj2s(ra, v); }
- else
- setobj2s(XRA(i), luaV_index(L, rb, rc, 0));
- }
- else
- setobj2s(XRA(i), luaV_getnotable(L, rb, rc, 0));
- break;
- }
- case OP_SETGLOBAL: {
- lua_assert(ttisstring(KBx(i)) && ttistable(&cl->g));
- luaV_settable(L, &cl->g, KBx(i), ra);
- break;
- }
- case OP_SETUPVAL: {
- int b = GETARG_B(i);
- setobj(cl->upvals[b]->v, ra); /* write barrier */
- break;
- }
- case OP_SETTABLE: {
- luaV_settable(L, ra, RKB(i), RKC(i));
- break;
- }
- case OP_NEWTABLE: {
- int b = GETARG_B(i);
- b = fb2int(b);
- sethvalue(ra, luaH_new(L, b, GETARG_C(i)));
- luaC_checkGC(L);
- break;
- }
- case OP_SELF: {
- StkId rb = RB(i);
- TObject *rc = RKC(i);
- runtime_check(L, ttisstring(rc));
- setobjs2s(ra+1, rb);
- if (ttistable(rb)) {
- const TObject *v = luaH_getstr(hvalue(rb), tsvalue(rc));
- if (!ttisnil(v)) { setobj2s(ra, v); }
- else
- setobj2s(XRA(i), luaV_index(L, rb, rc, 0));
- }
- else
- setobj2s(XRA(i), luaV_getnotable(L, rb, rc, 0));
- break;
- }
- case OP_ADD: {
- TObject *rb = RKB(i);
- TObject *rc = RKC(i);
- if (ttisnumber(rb) && ttisnumber(rc)) {
- setnvalue(ra, nvalue(rb) + nvalue(rc));
- }
- else
- Arith(L, ra, rb, rc, TM_ADD);
- break;
- }
- case OP_SUB: {
- TObject *rb = RKB(i);
- TObject *rc = RKC(i);
- if (ttisnumber(rb) && ttisnumber(rc)) {
- setnvalue(ra, nvalue(rb) - nvalue(rc));
- }
- else
- Arith(L, ra, rb, rc, TM_SUB);
- break;
- }
- case OP_MUL: {
- TObject *rb = RKB(i);
- TObject *rc = RKC(i);
- if (ttisnumber(rb) && ttisnumber(rc)) {
- setnvalue(ra, nvalue(rb) * nvalue(rc));
- }
- else
- Arith(L, ra, rb, rc, TM_MUL);
- break;
- }
- case OP_DIV: {
- TObject *rb = RKB(i);
- TObject *rc = RKC(i);
- if (ttisnumber(rb) && ttisnumber(rc)) {
- setnvalue(ra, nvalue(rb) / nvalue(rc));
- }
- else
- Arith(L, ra, rb, rc, TM_DIV);
- break;
- }
- case OP_POW: {
- Arith(L, ra, RKB(i), RKC(i), TM_POW);
- break;
- }
- case OP_UNM: {
- const TObject *rb = RB(i);
- TObject temp;
- if (tonumber(rb, &temp)) {
- setnvalue(ra, -nvalue(rb));
- }
- else {
- setnilvalue(&temp);
- if (!call_binTM(L, RB(i), &temp, ra, TM_UNM))
- luaG_aritherror(L, RB(i), &temp);
- }
- break;
- }
- case OP_NOT: {
- int res = l_isfalse(RB(i)); /* next assignment may change this value */
- setbvalue(ra, res);
- break;
- }
- case OP_CONCAT: {
- int b = GETARG_B(i);
- int c = GETARG_C(i);
- luaV_concat(L, c-b+1, c); /* may change `base' (and `ra') */
- base = L->base;
- setobjs2s(RA(i), base+b);
- luaC_checkGC(L);
- break;
- }
- case OP_JMP: {
- dojump(pc, GETARG_sBx(i));
- break;
- }
- case OP_EQ: {
- if (equalobj(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
- else dojump(pc, GETARG_sBx(*pc) + 1);
- break;
- }
- case OP_LT: {
- if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
- else dojump(pc, GETARG_sBx(*pc) + 1);
- break;
- }
- case OP_LE: {
- if (luaV_lessequal(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
- else dojump(pc, GETARG_sBx(*pc) + 1);
- break;
- }
- case OP_TEST: {
- TObject *rb = RB(i);
- if (l_isfalse(rb) == GETARG_C(i)) pc++;
- else {
- setobjs2s(ra, rb);
- dojump(pc, GETARG_sBx(*pc) + 1);
- }
- break;
- }
- case OP_CALL:
- case OP_TAILCALL: {
- StkId firstResult;
- int b = GETARG_B(i);
- int nresults;
- if (b != 0) L->top = ra+b; /* else previous instruction set top */
- nresults = GETARG_C(i) - 1;
- firstResult = luaD_precall(L, ra);
- if (firstResult) {
- if (firstResult > L->top) { /* yield? */
- lua_assert(L->ci->state == (CI_C | CI_YIELD));
- (L->ci - 1)->u.l.savedpc = pc;
- (L->ci - 1)->state = CI_SAVEDPC;
- return NULL;
- }
- /* it was a C function (`precall' called it); adjust results */
- luaD_poscall(L, nresults, firstResult);
- if (nresults >= 0) L->top = L->ci->top;
- }
- else { /* it is a Lua function */
- if (GET_OPCODE(i) == OP_CALL) { /* regular call? */
- (L->ci-1)->u.l.savedpc = pc; /* save `pc' to return later */
- (L->ci-1)->state = (CI_SAVEDPC | CI_CALLING);
- }
- else { /* tail call: put new frame in place of previous one */
- int aux;
- base = (L->ci - 1)->base; /* `luaD_precall' may change the stack */
- ra = RA(i);
- if (L->openupval) luaF_close(L, base);
- for (aux = 0; ra+aux < L->top; aux++) /* move frame down */
- setobjs2s(base+aux-1, ra+aux);
- (L->ci - 1)->top = L->top = base+aux; /* correct top */
- lua_assert(L->ci->state & CI_SAVEDPC);
- (L->ci - 1)->u.l.savedpc = L->ci->u.l.savedpc;
- (L->ci - 1)->u.l.tailcalls++; /* one more call lost */
- (L->ci - 1)->state = CI_SAVEDPC;
- L->ci--; /* remove new frame */
- L->base = L->ci->base;
- }
- goto callentry;
- }
- break;
- }
- case OP_RETURN: {
- CallInfo *ci = L->ci - 1; /* previous function frame */
- int b = GETARG_B(i);
- if (b != 0) L->top = ra+b-1;
- lua_assert(L->ci->state & CI_HASFRAME);
- if (L->openupval) luaF_close(L, base);
- L->ci->state = CI_SAVEDPC; /* deactivate current function */
- L->ci->u.l.savedpc = pc;
- /* previous function was running `here'? */
- if (!(ci->state & CI_CALLING)) {
- lua_assert((ci->state & CI_C) || ci->u.l.pc != &pc);
- return ra; /* no: return */
- }
- else { /* yes: continue its execution */
- int nresults;
- lua_assert(ttisfunction(ci->base - 1) && (ci->state & CI_SAVEDPC));
- lua_assert(GET_OPCODE(*(ci->u.l.savedpc - 1)) == OP_CALL);
- nresults = GETARG_C(*(ci->u.l.savedpc - 1)) - 1;
- luaD_poscall(L, nresults, ra);
- if (nresults >= 0) L->top = L->ci->top;
- goto retentry;
- }
- }
- case OP_FORLOOP: {
- lua_Number step, idx, limit;
- const TObject *plimit = ra+1;
- const TObject *pstep = ra+2;
- if (!ttisnumber(ra))
- luaG_runerror(L, "`for' initial value must be a number");
- if (!tonumber(plimit, ra+1))
- luaG_runerror(L, "`for' limit must be a number");
- if (!tonumber(pstep, ra+2))
- luaG_runerror(L, "`for' step must be a number");
- step = nvalue(pstep);
- idx = nvalue(ra) + step; /* increment index */
- limit = nvalue(plimit);
- if (step > 0 ? idx <= limit : idx >= limit) {
- dojump(pc, GETARG_sBx(i)); /* jump back */
- chgnvalue(ra, idx); /* update index */
- }
- break;
- }
- case OP_TFORLOOP: {
- int nvar = GETARG_C(i) + 1;
- StkId cb = ra + nvar + 2; /* call base */
- setobjs2s(cb, ra);
- setobjs2s(cb+1, ra+1);
- setobjs2s(cb+2, ra+2);
- L->top = cb+3; /* func. + 2 args (state and index) */
- luaD_call(L, cb, nvar);
- L->top = L->ci->top;
- ra = XRA(i) + 2; /* final position of first result */
- cb = ra + nvar;
- do { /* move results to proper positions */
- nvar--;
- setobjs2s(ra+nvar, cb+nvar);
- } while (nvar > 0);
- if (ttisnil(ra)) /* break loop? */
- pc++; /* skip jump (break loop) */
- else
- dojump(pc, GETARG_sBx(*pc) + 1); /* jump back */
- break;
- }
- case OP_TFORPREP: { /* for compatibility only */
- if (ttistable(ra)) {
- setobjs2s(ra+1, ra);
- setobj2s(ra, luaH_getstr(hvalue(gt(L)), luaS_new(L, "next")));
- }
- dojump(pc, GETARG_sBx(i));
- break;
- }
- case OP_SETLIST:
- case OP_SETLISTO: {
- int bc;
- int n;
- Table *h;
- runtime_check(L, ttistable(ra));
- h = hvalue(ra);
- bc = GETARG_Bx(i);
- if (GET_OPCODE(i) == OP_SETLIST)
- n = (bc&(LFIELDS_PER_FLUSH-1)) + 1;
- else {
- n = L->top - ra - 1;
- L->top = L->ci->top;
- }
- bc &= ~(LFIELDS_PER_FLUSH-1); /* bc = bc - bc%FPF */
- for (; n > 0; n--)
- setobj2t(luaH_setnum(L, h, bc+n), ra+n); /* write barrier */
- break;
- }
- case OP_CLOSE: {
- luaF_close(L, ra);
- break;
- }
- case OP_CLOSURE: {
- Proto *p;
- Closure *ncl;
- int nup, j;
- p = cl->p->p[GETARG_Bx(i)];
- nup = p->nups;
- ncl = luaF_newLclosure(L, nup, &cl->g);
- ncl->l.p = p;
- for (j=0; j<nup; j++, pc++) {
- if (GET_OPCODE(*pc) == OP_GETUPVAL)
- ncl->l.upvals[j] = cl->upvals[GETARG_B(*pc)];
- else {
- lua_assert(GET_OPCODE(*pc) == OP_MOVE);
- ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));
- }
- }
- setclvalue(ra, ncl);
- luaC_checkGC(L);
- break;
- }
- }
- }
-}
-
-
+++ /dev/null
-/*
-** $Id: lvm.h,v 1.47 2002/11/14 16:16:21 roberto Exp $
-** Lua virtual machine
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lvm_h
-#define lvm_h
-
-
-#include "ldo.h"
-#include "lobject.h"
-#include "ltm.h"
-
-
-#define tostring(L,o) ((ttype(o) == LUA_TSTRING) || (luaV_tostring(L, o)))
-
-#define tonumber(o,n) (ttype(o) == LUA_TNUMBER || \
- (((o) = luaV_tonumber(o,n)) != NULL))
-
-#define equalobj(L,o1,o2) \
- (ttype(o1) == ttype(o2) && luaV_equalval(L, o1, o2))
-
-
-int luaV_lessthan (lua_State *L, const TObject *l, const TObject *r);
-int luaV_equalval (lua_State *L, const TObject *t1, const TObject *t2);
-const TObject *luaV_tonumber (const TObject *obj, TObject *n);
-int luaV_tostring (lua_State *L, StkId obj);
-const TObject *luaV_gettable (lua_State *L, const TObject *t, TObject *key,
- int loop);
-void luaV_settable (lua_State *L, const TObject *t, TObject *key, StkId val);
-StkId luaV_execute (lua_State *L);
-void luaV_concat (lua_State *L, int total, int last);
-
-#endif
+++ /dev/null
-/*
-** $Id: lzio.c,v 1.24 2003/03/20 16:00:56 roberto Exp $
-** a generic input stream interface
-** See Copyright Notice in lua.h
-*/
-
-
-#include <string.h>
-
-#define lzio_c
-
-#include "lua.h"
-
-#include "llimits.h"
-#include "lmem.h"
-#include "lzio.h"
-
-
-int luaZ_fill (ZIO *z) {
- size_t size;
- const char *buff = z->reader(NULL, z->data, &size);
- if (buff == NULL || size == 0) return EOZ;
- z->n = size - 1;
- z->p = buff;
- return char2int(*(z->p++));
-}
-
-
-int luaZ_lookahead (ZIO *z) {
- if (z->n == 0) {
- int c = luaZ_fill(z);
- if (c == EOZ) return c;
- z->n++;
- z->p--;
- }
- return char2int(*z->p);
-}
-
-
-void luaZ_init (ZIO *z, lua_Chunkreader reader, void *data, const char *name) {
- z->reader = reader;
- z->data = data;
- z->name = name;
- z->n = 0;
- z->p = NULL;
-}
-
-
-/* --------------------------------------------------------------- read --- */
-size_t luaZ_read (ZIO *z, void *b, size_t n) {
- while (n) {
- size_t m;
- if (z->n == 0) {
- if (luaZ_fill(z) == EOZ)
- return n; /* return number of missing bytes */
- else {
- ++z->n; /* filbuf removed first byte; put back it */
- --z->p;
- }
- }
- m = (n <= z->n) ? n : z->n; /* min. between n and z->n */
- memcpy(b, z->p, m);
- z->n -= m;
- z->p += m;
- b = (char *)b + m;
- n -= m;
- }
- return 0;
-}
-
-/* ------------------------------------------------------------------------ */
-char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
- if (n > buff->buffsize) {
- if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
- luaM_reallocvector(L, buff->buffer, buff->buffsize, n, char);
- buff->buffsize = n;
- }
- return buff->buffer;
-}
-
-
+++ /dev/null
-/*
-** $Id: lzio.h,v 1.15 2003/03/20 16:00:56 roberto Exp $
-** Buffered streams
-** See Copyright Notice in lua.h
-*/
-
-
-#ifndef lzio_h
-#define lzio_h
-
-#include "lua.h"
-
-
-#define EOZ (-1) /* end of stream */
-
-typedef struct Zio ZIO;
-
-
-#define char2int(c) cast(int, cast(unsigned char, (c)))
-
-#define zgetc(z) (((z)->n--)>0 ? char2int(*(z)->p++) : luaZ_fill(z))
-
-#define zname(z) ((z)->name)
-
-void luaZ_init (ZIO *z, lua_Chunkreader reader, void *data, const char *name);
-size_t luaZ_read (ZIO* z, void* b, size_t n); /* read next n bytes */
-int luaZ_lookahead (ZIO *z);
-
-
-
-typedef struct Mbuffer {
- char *buffer;
- size_t buffsize;
-} Mbuffer;
-
-
-char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
-
-#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
-
-#define luaZ_sizebuffer(buff) ((buff)->buffsize)
-#define luaZ_buffer(buff) ((buff)->buffer)
-
-#define luaZ_resizebuffer(L, buff, size) \
- (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
- (buff)->buffsize = size)
-
-#define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0)
-
-
-/* --------- Private Part ------------------ */
-
-struct Zio {
- size_t n; /* bytes still unread */
- const char *p; /* current position in buffer */
- lua_Chunkreader reader;
- void* data; /* additional data */
- const char *name;
-};
-
-
-int luaZ_fill (ZIO *z);
-
-#endif
+++ /dev/null
-These are simple tests for Lua. Some of them contain useful code.
-They are meant to be run to make sure Lua is built correctly and also
-to be read, to see how Lua programs look.
-
-Here is a one-line summary of each program:
-
- bisect.lua bisection method for solving non-linear equations
- cf.lua temperature conversion table (celsius to farenheit)
- echo.lua echo command line arguments
- env.lua environment variables as automatic global variables
- factorial.lua factorial without recursion
- fib.lua fibonacci function with cache
- fibfor.lua fibonacci numbers with coroutines and generators
- globals.lua report global variable usage
- hello.lua the first program in every language
- life.lua Conway's Game of Life
- luac.lua bare-bones luac
- printf.lua an implementation of printf
- readonly.lua make global variables readonly
- sieve.lua the sieve of of Eratosthenes programmed with coroutines
- sort.lua two implementations of a sort function
- table.lua make table, grouping all data for the same item
- trace-calls.lua trace calls
- trace-globals.lua trace assigments to global variables
- undefined.lua catch "undefined" global variables
- xd.lua hex dump
-
+++ /dev/null
--- bisection method for solving non-linear equations
-
-delta=1e-6 -- tolerance
-
-function bisect(f,a,b,fa,fb)
- local c=(a+b)/2
- io.write(n," c=",c," a=",a," b=",b,"\n")
- if c==a or c==b or math.abs(a-b)<delta then return c,b-a end
- n=n+1
- local fc=f(c)
- if fa*fc<0 then return bisect(f,a,c,fa,fc) else return bisect(f,c,b,fc,fb) end
-end
-
--- find root of f in the inverval [a,b]. needs f(a)*f(b)<0
-function solve(f,a,b)
- n=0
- local z,e=bisect(f,a,b,f(a),f(b))
- io.write(string.format("after %d steps, root is %.17g with error %.1e, f=%.1e\n",n,z,e,f(z)))
-end
-
--- our function
-function f(x)
- return x*x*x-x-1
-end
-
--- find zero in [1,2]
-solve(f,1,2)
+++ /dev/null
--- temperature conversion table (celsius to farenheit)
-
-for c0=-20,50-1,10 do
- io.write("C ")
- for c=c0,c0+10-1 do
- io.write(string.format("%3.0f ",c))
- end
- io.write("\n")
-
- io.write("F ")
- for c=c0,c0+10-1 do
- f=(9/5)*c+32
- io.write(string.format("%3.0f ",f))
- end
- io.write("\n\n")
-end
+++ /dev/null
--- echo command line arguments
-
-for i=0,table.getn(arg) do
- print(i,arg[i])
-end
+++ /dev/null
--- read environment variables as if they were global variables
-
-local f=function (t,i) return os.getenv(i) end
-setmetatable(getfenv(),{__index=f})
-
--- an example
-print(a,USER,PATH)
+++ /dev/null
--- function closures are powerful
-
--- traditional fixed-point operator from functional programming
-Y = function (g)
- local a = function (f) return f(f) end
- return a(function (f)
- return g(function (x)
- local c=f(f)
- return c(x)
- end)
- end)
-end
-
-
--- factorial without recursion
-F = function (f)
- return function (n)
- if n == 0 then return 1
- else return n*f(n-1) end
- end
- end
-
-factorial = Y(F) -- factorial is the fixed point of F
-
--- now test it
-function test(x)
- io.write(x,"! = ",factorial(x),"\n")
-end
-
-for n=0,16 do
- test(n)
-end
+++ /dev/null
--- fibonacci function with cache
-
--- very inefficient fibonacci function
-function fib(n)
- N=N+1
- if n<2 then
- return n
- else
- return fib(n-1)+fib(n-2)
- end
-end
-
--- a general-purpose value cache
-function cache(f)
- local c={}
- return function (x)
- local y=c[x]
- if not y then
- y=f(x)
- c[x]=y
- end
- return y
- end
-end
-
--- run and time it
-function test(s,f)
- N=0
- local c=os.clock()
- local v=f(n)
- local t=os.clock()-c
- print(s,n,v,t,N)
-end
-
-n=arg[1] or 24 -- for other values, do lua fib.lua XX
-n=tonumber(n)
-print("","n","value","time","evals")
-test("plain",fib)
-fib=cache(fib)
-test("cached",fib)
+++ /dev/null
--- example of for with generator functions
-
-function generatefib (n)
- return coroutine.wrap(function ()
- local a,b = 1, 1
- while a <= n do
- coroutine.yield(a)
- a, b = b, a+b
- end
- end, n)
-end
-
-for i in generatefib(1000) do print(i) end
+++ /dev/null
--- reads luac listings and reports global variable usage
--- lines where a global is written to are marked with "*"
--- typical usage: luac -p -l file.lua | lua globals.lua | sort | lua table.lua
-
-while 1 do
- local s=io.read()
- if s==nil then break end
- local ok,_,l,op,g=string.find(s,"%[%-?(%d*)%]%s*([GS])ETGLOBAL.-;%s+(.*)$")
- if ok then
- if op=="S" then op="*" else op="" end
- io.write(g,"\t",l,op,"\n")
- end
-end
+++ /dev/null
--- the first program in every language
-
-io.write("Hello world, from ",_VERSION,"!\n")
+++ /dev/null
--- life.lua
--- original by Dave Bollinger <DBollinger@compuserve.com> posted to lua-l
--- modified to use ANSI terminal escape sequences
--- modified to use for instead of while
-
-local write=io.write
-
-ALIVE="¥" DEAD="þ"
-ALIVE="O" DEAD="-"
-
-function delay() -- NOTE: SYSTEM-DEPENDENT, adjust as necessary
- for i=1,10000 do end
- -- local i=os.clock()+1 while(os.clock()<i) do end
-end
-
-function ARRAY2D(w,h)
- local t = {w=w,h=h}
- for y=1,h do
- t[y] = {}
- for x=1,w do
- t[y][x]=0
- end
- end
- return t
-end
-
-_CELLS = {}
-
--- give birth to a "shape" within the cell array
-function _CELLS:spawn(shape,left,top)
- for y=0,shape.h-1 do
- for x=0,shape.w-1 do
- self[top+y][left+x] = shape[y*shape.w+x+1]
- end
- end
-end
-
--- run the CA and produce the next generation
-function _CELLS:evolve(next)
- local ym1,y,yp1,yi=self.h-1,self.h,1,self.h
- while yi > 0 do
- local xm1,x,xp1,xi=self.w-1,self.w,1,self.w
- while xi > 0 do
- local sum = self[ym1][xm1] + self[ym1][x] + self[ym1][xp1] +
- self[y][xm1] + self[y][xp1] +
- self[yp1][xm1] + self[yp1][x] + self[yp1][xp1]
- next[y][x] = ((sum==2) and self[y][x]) or ((sum==3) and 1) or 0
- xm1,x,xp1,xi = x,xp1,xp1+1,xi-1
- end
- ym1,y,yp1,yi = y,yp1,yp1+1,yi-1
- end
-end
-
--- output the array to screen
-function _CELLS:draw()
- local out="" -- accumulate to reduce flicker
- for y=1,self.h do
- for x=1,self.w do
- out=out..(((self[y][x]>0) and ALIVE) or DEAD)
- end
- out=out.."\n"
- end
- write(out)
-end
-
--- constructor
-function CELLS(w,h)
- local c = ARRAY2D(w,h)
- c.spawn = _CELLS.spawn
- c.evolve = _CELLS.evolve
- c.draw = _CELLS.draw
- return c
-end
-
---
--- shapes suitable for use with spawn() above
---
-HEART = { 1,0,1,1,0,1,1,1,1; w=3,h=3 }
-GLIDER = { 0,0,1,1,0,1,0,1,1; w=3,h=3 }
-EXPLODE = { 0,1,0,1,1,1,1,0,1,0,1,0; w=3,h=4 }
-FISH = { 0,1,1,1,1,1,0,0,0,1,0,0,0,0,1,1,0,0,1,0; w=5,h=4 }
-BUTTERFLY = { 1,0,0,0,1,0,1,1,1,0,1,0,0,0,1,1,0,1,0,1,1,0,0,0,1; w=5,h=5 }
-
--- the main routine
-function LIFE(w,h)
- -- create two arrays
- local thisgen = CELLS(w,h)
- local nextgen = CELLS(w,h)
-
- -- create some life
- -- about 1000 generations of fun, then a glider steady-state
- thisgen:spawn(GLIDER,5,4)
- thisgen:spawn(EXPLODE,25,10)
- thisgen:spawn(FISH,4,12)
-
- -- run until break
- local gen=1
- write("\027[2J") -- ANSI clear screen
- while 1 do
- thisgen:evolve(nextgen)
- thisgen,nextgen = nextgen,thisgen
- write("\027[H") -- ANSI home cursor
- thisgen:draw()
- write("Life - generation ",gen,"\n")
- gen=gen+1
- if gen>2000 then break end
- --delay() -- no delay
- end
-end
-
-LIFE(40,20)
+++ /dev/null
-../bin/lua
\ No newline at end of file
+++ /dev/null
-../bin/luac
\ No newline at end of file
+++ /dev/null
--- bare-bones luac in Lua
--- usage: lua luac.lua file.lua
-
-assert(arg[1]~=nil and arg[2]==nil,"usage: lua luac.lua file.lua")
-f=assert(io.open("luac.out","wb"))
-f:write(string.dump(assert(loadfile(arg[1]))))
-io.close(f)
+++ /dev/null
--- an implementation of printf
-
-function printf(...)
- io.write(string.format(unpack(arg)))
-end
-
-printf("Hello %s from %s on %s\n",os.getenv"USER" or "there",_VERSION,os.date())
+++ /dev/null
--- make global variables readonly
-
-local f=function (t,i) error("cannot redefine global variable `"..i.."'",2) end
-local g={}
-local G=getfenv()
-setmetatable(g,{__index=G,__newindex=f})
-setfenv(1,g)
-
--- an example
-rawset(g,"x",3)
-x=2
-y=1 -- cannot redefine `y'
+++ /dev/null
--- the sieve of of Eratosthenes programmed with coroutines
--- typical usage: lua -e N=1000 sieve.lua | column
-
--- generate all the numbers from 2 to n
-function gen (n)
- return coroutine.wrap(function ()
- for i=2,n do coroutine.yield(i) end
- end)
-end
-
--- filter the numbers generated by `g', removing multiples of `p'
-function filter (p, g)
- return coroutine.wrap(function ()
- while 1 do
- local n = g()
- if n == nil then return end
- if math.mod(n, p) ~= 0 then coroutine.yield(n) end
- end
- end)
-end
-
-N=N or 1000 -- from command line
-x = gen(N) -- generate primes up to N
-while 1 do
- local n = x() -- pick a number until done
- if n == nil then break end
- print(n) -- must be a prime number
- x = filter(n, x) -- now remove its multiples
-end
+++ /dev/null
--- two implementations of a sort function
--- this is an example only. Lua has now a built-in function "sort"
-
--- extracted from Programming Pearls, page 110
-function qsort(x,l,u,f)
- if l<u then
- local m=math.random(u-(l-1))+l-1 -- choose a random pivot in range l..u
- x[l],x[m]=x[m],x[l] -- swap pivot to first position
- local t=x[l] -- pivot value
- m=l
- local i=l+1
- while i<=u do
- -- invariant: x[l+1..m] < t <= x[m+1..i-1]
- if f(x[i],t) then
- m=m+1
- x[m],x[i]=x[i],x[m] -- swap x[i] and x[m]
- end
- i=i+1
- end
- x[l],x[m]=x[m],x[l] -- swap pivot to a valid place
- -- x[l+1..m-1] < x[m] <= x[m+1..u]
- qsort(x,l,m-1,f)
- qsort(x,m+1,u,f)
- end
-end
-
-function selectionsort(x,n,f)
- local i=1
- while i<=n do
- local m,j=i,i+1
- while j<=n do
- if f(x[j],x[m]) then m=j end
- j=j+1
- end
- x[i],x[m]=x[m],x[i] -- swap x[i] and x[m]
- i=i+1
- end
-end
-
-function show(m,x)
- io.write(m,"\n\t")
- local i=1
- while x[i] do
- io.write(x[i])
- i=i+1
- if x[i] then io.write(",") end
- end
- io.write("\n")
-end
-
-function testsorts(x)
- local n=1
- while x[n] do n=n+1 end; n=n-1 -- count elements
- show("original",x)
- qsort(x,1,n,function (x,y) return x<y end)
- show("after quicksort",x)
- selectionsort(x,n,function (x,y) return x>y end)
- show("after reverse selection sort",x)
- qsort(x,1,n,function (x,y) return x<y end)
- show("after quicksort again",x)
-end
-
--- array to be sorted
-x={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"}
-
-testsorts(x)
+++ /dev/null
--- make table, grouping all data for the same item
--- input is 2 columns (item, data)
-
-local A
-while 1 do
- local l=io.read()
- if l==nil then break end
- local _,_,a,b=string.find(l,'"?([_%w]+)"?%s*(.*)$')
- if a~=A then A=a io.write("\n",a,":") end
- io.write(" ",b)
-end
-io.write("\n")
+++ /dev/null
--- trace calls
--- example: lua -ltrace-calls.lua bisect.lua
-
-local level=0
-
-function hook(event)
- local t=debug.getinfo(3)
- io.write(level," >>> ",string.rep(" ",level))
- if t~=nil and t.currentline>=0 then io.write(t.short_src,":",t.currentline," ") end
- t=debug.getinfo(2)
- if event=="call" then
- level=level+1
- else
- level=level-1 if level<0 then level=0 end
- end
- if t.what=="main" then
- if event=="call" then
- io.write("begin ",t.short_src)
- else
- io.write("end ",t.short_src)
- end
- elseif t.what=="Lua" then
--- table.foreach(t,print)
- io.write(event," ",t.name or "(Lua)"," <",t.linedefined,":",t.short_src,">")
- else
- io.write(event," ",t.name or "(C)"," [",t.what,"] ")
- end
- io.write("\n")
-end
-
-debug.sethook(hook,"cr")
-level=0
+++ /dev/null
--- trace assigments to global variables
-
-do
- -- a tostring that quotes strings. note the use of the original tostring.
- local _tostring=tostring
- local tostring=function(a)
- if type(a)=="string" then
- return string.format("%q",a)
- else
- return _tostring(a)
- end
- end
-
- local log=function (name,old,new)
- local t=debug.getinfo(3,"Sl")
- local line=t.currentline
- io.write(t.short_src)
- if line>=0 then io.write(":",line) end
- io.write(": ",name," is now ",tostring(new)," (was ",tostring(old),")","\n")
- end
-
- local g={}
- local set=function (t,name,value)
- log(name,g[name],value)
- g[name]=value
- end
- setmetatable(getfenv(),{__index=g,__newindex=set})
-end
-
--- an example
-
-a=1
-b=2
-a=10
-b=20
-b=nil
-b=200
-print(a,b,c)
+++ /dev/null
--- catch "undefined" global variables
-
-local f=function (t,i) error("undefined global variable `"..i.."'",2) end
-setmetatable(getfenv(),{__index=f})
-
--- an example
-a=1
-c=3
-print(a,b,c) -- `b' is undefined
+++ /dev/null
--- hex dump
--- usage: lua xd.lua < file
-
-local offset=0
-
-while 1 do
- local s=io.read(16)
- if s==nil then return end
- io.write(string.format("%08X ",offset))
- string.gsub(s,"(.)",function (c) io.write(string.format("%02X ",string.byte(c))) end)
- io.write(string.rep(" ",3*(16-string.len(s))))
- io.write(" ",string.gsub(s,"%c","."),"\n")
- offset=offset+16
-end
git.samba.org / metze / wireshark / wip.git / commitdiff
