source4/pidl/expr.yp

   1 # expr.yp
   2 # Copyright (C) 2006 Jelmer Vernooij <jelmer@samba.org>
   3 # Published under the GNU GPL
   4 #
   5 %left   '->'
   6 %right  '!' '~'
   7 %left   '*' '/' '%'
   8 %left   '+' '-'
   9 %left   '<<' '>>'
  10 %left   '>' '<'
  11 %left   '==' '!='
  12 %left   '&'
  13 %left   '|'
  14 %left   '&&'
  15 %left   '||'
  16 %left   '?' ':'
  17 %left   NEG DEREF ADDROF INV
  18 %left   '.'
  19
  20 %%
  21 exp:        NUM
  22                 |       TEXT                            { "\"$_[1]\"" }
  23                 |       func
  24                 |       exp '.' VAR                     { "$_[1].$_[3]" }
  25         |   VAR                 { $_[0]->_Lookup($_[1]) }
  26         |   '*' exp %prec DEREF { $_[0]->_Dereference($_[2]); "*$_[2]" }
  27         |   '~' exp %prec INV   { "~$_[2]" }
  28         |   exp '+' exp         { "$_[1] + $_[3]" }
  29         |   exp '-' exp         { "$_[1] - $_[3]" }
  30         |   exp '*' exp         { "$_[1] * $_[3]" }
  31         |   exp '%' exp         { "$_[1] % $_[3]" }
  32         |   exp '<' exp         { "$_[1] < $_[3]" }
  33         |   exp '>' exp         { "$_[1] > $_[3]" }
  34         |   exp '|' exp         { "$_[1] | $_[3]" }
  35         |   exp '==' exp         { "$_[1] == $_[3]" }
  36         |   exp '<=' exp         { "$_[1] <= $_[3]" }
  37         |   exp '=>' exp         { "$_[1] => $_[3]" }
  38         |   exp '<<' exp         { "$_[1] << $_[3]" }
  39         |   exp '>>' exp         { "$_[1] >> $_[3]" }
  40         |   exp '!=' exp         { "$_[1] != $_[3]" }
  41         |   exp '||' exp        { "$_[1] || $_[3]" }
  42         |   exp '&&' exp        { "$_[1] && $_[3]" }
  43         |   exp '&' exp         { "$_[1] & $_[3]" }
  44                 |       exp '->' VAR            { $_[1]."->".$_[3] }
  45                 |       exp '?' exp ':' exp { "$_[1]?$_[3]:$_[5]" }
  46                 |       '~' exp                         { "~$_[1]" }
  47                 |       '!' exp                         { "not $_[1]" }
  48         |   exp '/' exp         { "$_[1] / $_[3]" }
  49         |   '-' exp %prec NEG   { "-$_[2]" }
  50         |   '&' exp %prec ADDROF { "&$_[2]" }
  51         |   exp '^' exp         { "$_[1]^$_[3]" }
  52         |   '(' exp ')'         { "($_[2])" }
  53 ;
  54
  55 func: VAR '(' opt_args ')' { "$_[1]($_[3])" };
  56 opt_args: { "" } | args;
  57 args: exp | exp ',' args { "$_[1], $_[3]" };
  58
  59 %%
  60
  61 package Parse::Pidl::Expr;
  62
  63 sub _Lexer {
  64     my($parser)=shift;
  65
  66     $parser->YYData->{INPUT}=~s/^[ \t]//;
  67
  68     for ($parser->YYData->{INPUT}) {
  69         if (s/^(0x[0-9A-Fa-f]+)//) {
  70                         $parser->YYData->{LAST_TOKEN} = $1;
  71             return('NUM',$1);
  72                 }
  73         if (s/^([0-9]+(?:\.[0-9]+)?)//) {
  74                         $parser->YYData->{LAST_TOKEN} = $1;
  75             return('NUM',$1);
  76                 }
  77         if (s/^([A-Za-z_][A-Za-z0-9_]*)//) {
  78                         $parser->YYData->{LAST_TOKEN} = $1;
  79                 return('VAR',$1);
  80                 }
  81                 if (s/^\"(.*?)\"//) {
  82                         $parser->YYData->{LAST_TOKEN} = $1;
  83                         return('TEXT',$1);
  84                 }
  85                 if (s/^(==|!=|<=|>=|->|\|\||<<|>>|&&)//s) {
  86                         $parser->YYData->{LAST_TOKEN} = $1;
  87             return($1,$1);
  88                 }
  89         if (s/^(.)//s) {
  90                         $parser->YYData->{LAST_TOKEN} = $1;
  91             return($1,$1);
  92                 }
  93     }
  94 }
  95
  96 sub _Lookup($$)
  97 {
  98         my ($self, $x) = @_;
  99         return $self->YYData->{LOOKUP}->($x);
 100 }
 101
 102 sub _Dereference($$)
 103 {
 104         my ($self, $x) = @_;
 105         if (defined($self->YYData->{DEREFERENCE})) {
 106                 $self->YYData->{DEREFERENCE}->($x);
 107         }
 108 }
 109
 110 sub _Error($)
 111 {
 112         my ($self) = @_;
 113         $self->YYData->{ERROR}->("Parse error in `".$self->YYData->{FULL_INPUT}."' near `". $self->YYData->{LAST_TOKEN} . "'");
 114 }
 115
 116 sub Run {
 117     my($self, $data, $error, $lookup, $deref) = @_;
 118     $self->YYData->{FULL_INPUT} = $data;
 119     $self->YYData->{INPUT} = $data;
 120     $self->YYData->{LOOKUP} = $lookup;
 121     $self->YYData->{DEREFERENCE} = $deref;
 122     $self->YYData->{ERROR} = $error;
 123     return $self->YYParse( yylex => \&_Lexer, yyerror => \&_Error);
 124 }