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: slc-lex.l 15118 2005-05-10 22:19:01Z lha $ */ 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" 45 unsigned lineno = 1; 46 47 static void handle_comment(void); 48 static char * handle_string(void); 49 50 #define YY_NO_UNPUT 51 52 #undef ECHO 53 54 %} 55 %% 56 [A-Za-z][-A-Za-z0-9_]* { 57 yylval.string = strdup ((const char *)yytext); 58 return LITERAL; 59 } 60 "\"" { yylval.string = handle_string(); return STRING; } 61 \n { ++lineno; } 62 \/\* { handle_comment(); } 63 [={}] { return *yytext; } 64 [ \t] ; 65 %% 66 67 void 68 error_message (const char *format, ...) 69 { 70 va_list args; 71 72 va_start (args, format); 73 fprintf (stderr, "%s:%d: ", filename, lineno); 74 vfprintf (stderr, format, args); 75 va_end (args); 76 error_flag++; 77 } 78 79 void 80 yyerror (char *s) 81 { 82 error_message("%s\n", s); 83 } 84 85 static void 86 handle_comment(void) 87 { 88 int c; 89 int start_lineno = lineno; 90 int level = 1; 91 int seen_star = 0; 92 int seen_slash = 0; 93 while((c = input()) != EOF) { 94 if(c == '/') { 95 if(seen_star) { 96 if(--level == 0) 97 return; 98 seen_star = 0; 99 continue; 100 } 101 seen_slash = 1; 102 continue; 103 } 104 if(seen_star && c == '/') { 105 if(--level == 0) 106 return; 107 seen_star = 0; 108 continue; 109 } 110 if(c == '*') { 111 if(seen_slash) { 112 level++; 113 seen_star = seen_slash = 0; 114 continue; 115 } 116 seen_star = 1; 117 continue; 118 } 119 seen_star = seen_slash = 0; 120 if(c == '\n') { 121 lineno++; 122 continue; 123 } 124 } 125 if(c == EOF) 126 error_message("unterminated comment, possibly started on line %d\n", start_lineno); 127 } 128 129 static char * 130 handle_string(void) 131 { 132 char x[1024]; 133 int i = 0; 134 int c; 135 int quote = 0; 136 while((c = input()) != EOF){ 137 if(quote) { 138 x[i++] = '\\'; 139 x[i++] = c; 140 quote = 0; 141 continue; 142 } 143 if(c == '\n'){ 144 error_message("unterminated string"); 145 lineno++; 146 break; 147 } 148 if(c == '\\'){ 149 quote++; 150 continue; 151 } 152 if(c == '\"') 153 break; 154 x[i++] = c; 155 } 156 x[i] = '\0'; 157 return strdup(x); 158 } 159 160 int 161 yywrap () 162 { 163 return 1; 164 } 165