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%lex-param { void* scanner }
30%{
31#include <stdio.h>
32#include <stdlib.h>
33#include <string.h>
34#include "config.h"
35#include "bison_yylval_parser.h"
36#include "bison_yylval_scanner.h"
37
38#define YYERROR_VERBOSE 1
39
40int yyerror(void* scanner, const char* msg);
41
42/* A dummy function. A check against seg-faults in yylval->str. */
43static 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    long unused;
59    char * str;
60}
61
62%token <str> TAGNAME TEXT
63%token  LT
64%token  GT
65%token  LTSLASH "</"
66
67%%
68
69html:
70    TEXT { process_text($1); free($1);}
71  | starttag html endtag
72  | html TEXT { process_text($2); free($2);}
73  | html starttag html endtag
74  ;
75
76starttag:  LT      TAGNAME GT { process_text($2); free($2);} ;
77endtag:    LTSLASH TAGNAME GT { process_text($2);free($2);} ;
78%%
79
80int yyerror(void* scanner, const char* msg) {
81    (void)scanner;
82    fprintf(stderr,"%s\n",msg);
83    return 0;
84}
85