flex-2.5.33/tests/test-bison-nr/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 /*
  25    How to compile:
  26    bison --defines --output-file="parser.c" --name-prefix="test" parser.y
  27  */
  28 %{
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include "config.h"
  33
  34 #define YYERROR_VERBOSE 1
  35 /* #define YYPARSE_PARAM scanner */
  36 /* #define YYLEX_PARAM   scanner */
  37
  38 int yyerror(char* msg);
  39 extern int testget_lineno(void);
  40
  41
  42 /* A dummy function. A check against seg-faults in yylval->str. */
  43 int process_text(char* s) {
  44     int total =0;
  45     while(*s) {
  46         total += (int) *s;
  47         ++s;
  48     }
  49     return total;
  50 }
  51
  52
  53 %}
  54
  55 %pure_parser
  56
  57 %union  {
  58     int  lineno;
  59     char * str;
  60 }
  61 %token <str> IDENT
  62 %token <lineno> LINENO
  63 %token  EQUAL "="
  64 %token  COLON ":"
  65 %token  SPACE " "
  66 %%
  67
  68 file:
  69      line
  70   |  file line
  71   ;
  72
  73 line:
  74     LINENO COLON SPACE IDENT EQUAL IDENT
  75     {
  76         process_text($4);
  77         process_text($6);
  78         /* Check lineno. */
  79         if( $1 != @1.first_line || $1 != testget_lineno())
  80         {
  81             yyerror("Parse failed: Line numbers do not match.");
  82             YYABORT;
  83         }
  84
  85         /* Recreate the line to stdout. */
  86         printf ( "%04d: %s=%s\n", @1.first_line, $4, $6);
  87     }
  88     ;
  89
  90 %%
  91
  92 int yyerror(char* msg) {
  93     fprintf(stderr,"%s\n",msg);
  94     return 0;
  95 }
  96