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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.
*/
/*
How to compile:
bison --defines --output-file="parser.c" --name-prefix="test" parser.y
*/
%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#define YYERROR_VERBOSE 1
#define YYPARSE_PARAM scanner
#define YYLEX_PARAM scanner
int yyerror(char* msg);
extern int testget_lineno(void*);
/* 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 {
int lineno;
char * str;
}
%token <str> IDENT
%token <lineno> LINENO
%token EQUAL "="
%token COLON ":"
%token SPACE " "
%%
file:
line
| file line
;
line:
LINENO COLON SPACE IDENT EQUAL IDENT
{
process_text($4);
process_text($6);
/* Check lineno. */
if( $1 != @1.first_line || $1 != testget_lineno(scanner))
{
yyerror("Parse failed: Line numbers do not match.");
YYABORT;
}
/* Recreate the line to stdout. */
printf ( "%04d: %s=%s\n", @1.first_line, $4, $6);
}
;
%%
int yyerror(char* msg) {
fprintf(stderr,"%s\n",msg);
return 0;
}
|
