slc-lex.l revision 233294
1%{ 2/* 3 * Copyright (c) 2004 Kungliga Tekniska H��gskolan 4 * (Royal Institute of Technology, Stockholm, Sweden). 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * 3. Neither the name of the Institute nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35/* $Id$ */ 36 37#undef ECHO 38 39#include <stdio.h> 40#include <string.h> 41#include <stdarg.h> 42#include <stdlib.h> 43#include "slc.h" 44#include "slc-gram.h" 45unsigned lineno = 1; 46 47static void handle_comment(void); 48static char * handle_string(void); 49 50#define YY_NO_UNPUT 51 52#undef ECHO 53 54%} 55 56%option nounput 57 58%% 59[A-Za-z][-A-Za-z0-9_]* { 60 yylval.string = strdup ((const char *)yytext); 61 return LITERAL; 62 } 63"\"" { yylval.string = handle_string(); return STRING; } 64\n { ++lineno; } 65\/\* { handle_comment(); } 66[={}] { return *yytext; } 67[ \t] ; 68%% 69 70void 71error_message (const char *format, ...) 72{ 73 va_list args; 74 75 va_start (args, format); 76 fprintf (stderr, "%s:%d: ", filename, lineno); 77 vfprintf (stderr, format, args); 78 va_end (args); 79 error_flag++; 80} 81 82void 83yyerror (char *s) 84{ 85 error_message("%s\n", s); 86} 87 88static void 89handle_comment(void) 90{ 91 int c; 92 int start_lineno = lineno; 93 int level = 1; 94 int seen_star = 0; 95 int seen_slash = 0; 96 while((c = input()) != EOF) { 97 if(c == '/') { 98 if(seen_star) { 99 if(--level == 0) 100 return; 101 seen_star = 0; 102 continue; 103 } 104 seen_slash = 1; 105 continue; 106 } else if(c == '*') { 107 if(seen_slash) { 108 level++; 109 seen_star = seen_slash = 0; 110 continue; 111 } 112 seen_star = 1; 113 continue; 114 } 115 seen_star = seen_slash = 0; 116 if(c == '\n') { 117 lineno++; 118 continue; 119 } 120 } 121 if(c == EOF) 122 error_message("unterminated comment, possibly started on line %d\n", start_lineno); 123} 124 125static char * 126handle_string(void) 127{ 128 char x[1024]; 129 int i = 0; 130 int c; 131 int quote = 0; 132 while((c = input()) != EOF){ 133 if(quote) { 134 x[i++] = '\\'; 135 x[i++] = c; 136 quote = 0; 137 continue; 138 } 139 if(c == '\n'){ 140 error_message("unterminated string"); 141 lineno++; 142 break; 143 } 144 if(c == '\\'){ 145 quote++; 146 continue; 147 } 148 if(c == '\"') 149 break; 150 x[i++] = c; 151 } 152 x[i] = '\0'; 153 return strdup(x); 154} 155 156int 157yywrap () 158{ 159 return 1; 160} 161