/*

 * 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;

}