| /* |
| * 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. |
| */ |
| |
| %parse-param { void* scanner } |
| |
| /* |
| 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 YYLEX_PARAM scanner |
| |
| 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(void* scanner, char* msg) { |
| fprintf(stderr,"%s\n",msg); |
| return 0; |
| } |
| |