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