external/bsd/flex/dist/tests/test-bison-yylval/parser.y

   1 /*
   2  * This file is part of flex.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * Neither the name of the University nor the names of its contributors
  15  * may be used to endorse or promote products derived from this software
  16  * without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  21  * PURPOSE.
  22  */
  23
  24 /* Accepts html-like input.
  25    How to compile:
  26    bison --defines --output-file="parser.c" --name-prefix="test" parser.y
  27  */
  28 %parse-param { void* scanner }
  29 %{
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include "config.h"
  34
  35 #define YYERROR_VERBOSE 1
  36 #define YYLEX_PARAM   scanner
  37
  38
  39 /* A dummy function. A check against seg-faults in yylval->str. */
  40 int process_text(char* s) {
  41     int total =0;
  42     while(*s) {
  43         total += (int) *s;
  44         ++s;
  45     }
  46     return total;
  47 }
  48
  49
  50 %}
  51
  52 %pure_parser
  53
  54 %union  {
  55     long unused;
  56     char * str;
  57 }
  58
  59 %token <str> TAGNAME TEXT
  60 %token  LT
  61 %token  GT
  62 %token  LTSLASH "</"
  63
  64 %%
  65
  66 html:
  67     TEXT { process_text($1); free($1);}
  68   | starttag html endtag
  69   | html TEXT { process_text($2); free($2);}
  70   | html starttag html endtag
  71   ;
  72
  73 starttag:  LT      TAGNAME GT { process_text($2); free($2);} ;
  74 endtag:    LTSLASH TAGNAME GT { process_text($2);free($2);} ;
  75 %%
  76
  77 int yyerror(void* scanner, char* msg) {
  78     fprintf(stderr,"%s\n",msg);
  79     return 0;
  80 }