tc/emp_ematch.y

   1 %{
   2  #include <stdio.h>
   3  #include <stdlib.h>
   4  #include <malloc.h>
   5  #include <string.h>
   6  #include "m_ematch.h"
   7 %}
   8
   9 %locations
  10 %token-table
  11 %error-verbose
  12 %name-prefix="ematch_"
  13
  14 %union {
  15         unsigned int i;
  16         struct bstr *b;
  17         struct ematch *e;
  18 }
  19
  20 %{
  21  extern int ematch_lex(void);
  22  extern void yyerror(char *s);
  23  extern struct ematch *ematch_root;
  24  extern char *ematch_err;
  25 %}
  26
  27 %token <i> ERROR
  28 %token <b> ATTRIBUTE
  29 %token <i> AND OR NOT
  30 %type <i> invert relation
  31 %type <e> match expr
  32 %type <b> args
  33 %right AND OR
  34 %start input
  35 %%
  36 input:
  37         /* empty */
  38         | expr
  39                 { ematch_root = $1; }
  40         | expr error
  41                 {
  42                         ematch_root = $1;
  43                         YYACCEPT;
  44                 }
  45         ;
  46
  47 expr:
  48         match
  49                 { $$ = $1; }
  50         | match relation expr
  51                 {
  52                         $1->relation = $2;
  53                         $1->next = $3;
  54                         $$ = $1;
  55                 }
  56         ;
  57
  58 match:
  59         invert ATTRIBUTE '(' args ')'
  60                 {
  61                         $2->next = $4;
  62                         $$ = new_ematch($2, $1);
  63                         if ($$ == NULL)
  64                                 YYABORT;
  65                 }
  66         | invert '(' expr ')'
  67                 {
  68                         $$ = new_ematch(NULL, $1);
  69                         if ($$ == NULL)
  70                                 YYABORT;
  71                         $$->child = $3;
  72                 }
  73         ;
  74
  75 args:
  76         ATTRIBUTE
  77                 { $$ = $1; }
  78         | ATTRIBUTE args
  79                 { $1->next = $2; }
  80         ;
  81
  82 relation:
  83         AND
  84                 { $$ = TCF_EM_REL_AND; }
  85         | OR
  86                 { $$ = TCF_EM_REL_OR; }
  87         ;
  88
  89 invert:
  90         /* empty */
  91                 { $$ = 0; }
  92         | NOT
  93                 { $$ = 1; }
  94         ;
  95 %%
  96
  97  void yyerror(char *s)
  98  {
  99          ematch_err = strdup(s);
 100  }
 101