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/*
* This file is part of flex.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE.
*/
/* Accepts html-like input.
How to compile:
bison --defines --output-file="parser.c" --name-prefix="test" parser.y
*/
%parse-param { void* scanner }
%lex-param { void* scanner }
%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "bison_yylval_parser.h"
#include "bison_yylval_scanner.h"
#define YYERROR_VERBOSE 1
int yyerror(void* scanner, const char* msg);
/* A dummy function. A check against seg-faults in yylval->str. */
int process_text(char* s) {
int total =0;
while(*s) {
total += (int) *s;
++s;
}
return total;
}
%}
%pure-parser
%union {
long unused;
char * str;
}
%token <str> TAGNAME TEXT
%token LT
%token GT
%token LTSLASH "</"
%%
html:
TEXT { process_text($1); free($1);}
| starttag html endtag
| html TEXT { process_text($2); free($2);}
| html starttag html endtag
;
starttag: LT TAGNAME GT { process_text($2); free($2);} ;
endtag: LTSLASH TAGNAME GT { process_text($2);free($2);} ;
%%
int yyerror(void* scanner, const char* msg) {
(void)scanner;
fprintf(stderr,"%s\n",msg);
return 0;
}
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