1 /* 2 * This file is part of flex. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE. 22 */ 23 24 /* 25 How to compile: 26 bison --defines --output-file="parser.c" --name-prefix="test" parser.y 27 */ 28 %{ 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include "config.h" 33 #include "bison_nr_parser.h" 34 #include "bison_nr_scanner.h" 35 36 #define YYERROR_VERBOSE 1 37 /* #define YYPARSE_PARAM scanner */ 38 /* #define YYLEX_PARAM scanner */ 39 40 int yyerror(const char* msg); 41 42 43 /* A dummy function. A check against seg-faults in yylval->str. */ 44 static int process_text(char* s) { 45 int total =0; 46 while(*s) { 47 total += (int) *s; 48 ++s; 49 } 50 return total; 51 } 52 53 54 %} 55 56 %pure-parser 57 58 %union { 59 int lineno; 60 char * str; 61 } 62 %token <str> IDENT 63 %token <lineno> LINENO 64 %token EQUAL "=" 65 %token COLON ":" 66 %token SPACE " " 67 %% 68 69 file: 70 line 71 | file line 72 ; 73 74 line: 75 LINENO COLON SPACE IDENT EQUAL IDENT 76 { 77 process_text($4); 78 process_text($6); 79 /* Check lineno. */ 80 if( $1 != @1.first_line || $1 != testget_lineno()) 81 { 82 yyerror("Parse failed: Line numbers do not match."); 83 YYABORT; 84 } 85 86 /* Recreate the line to stdout. */ 87 printf ( "%04d: %s=%s\n", @1.first_line, $4, $6); 88 } 89 ; 90 91 %% 92 93 int yyerror(const char* msg) { 94 fprintf(stderr,"%s\n",msg); 95 return 0; 96 } 97 98