1 /* $NetBSD: slc-lex.l,v 1.2 2017/01/28 21:31:50 christos Exp $ */ 2 3 %{ 4 /* 5 * Copyright (c) 2004 Kungliga Tekniska Högskolan 6 * (Royal Institute of Technology, Stockholm, Sweden). 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * 3. Neither the name of the Institute nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 /* Id */ 38 39 #undef ECHO 40 41 #include <stdio.h> 42 #include <string.h> 43 #include <stdarg.h> 44 #include <stdlib.h> 45 #include "slc.h" 46 #include "slc-gram.h" 47 unsigned lineno = 1; 48 49 static void handle_comment(void); 50 static char * handle_string(void); 51 52 #define YY_NO_UNPUT 53 54 #undef ECHO 55 56 %} 57 58 %option nounput 59 60 %% 61 [A-Za-z][-A-Za-z0-9_]* { 62 yylval.string = strdup ((const char *)yytext); 63 return LITERAL; 64 } 65 "\"" { yylval.string = handle_string(); return STRING; } 66 \n { ++lineno; } 67 \/\* { handle_comment(); } 68 [={}] { return *yytext; } 69 [ \t] ; 70 %% 71 72 void 73 error_message (const char *format, ...) 74 { 75 va_list args; 76 77 va_start (args, format); 78 fprintf (stderr, "%s:%d: ", filename, lineno); 79 vfprintf (stderr, format, args); 80 va_end (args); 81 error_flag++; 82 } 83 84 void 85 yyerror (char *s) 86 { 87 error_message("%s\n", s); 88 } 89 90 static void 91 handle_comment(void) 92 { 93 int c; 94 int start_lineno = lineno; 95 int level = 1; 96 int seen_star = 0; 97 int seen_slash = 0; 98 while((c = input()) != EOF) { 99 if(c == '/') { 100 if(seen_star) { 101 if(--level == 0) 102 return; 103 seen_star = 0; 104 continue; 105 } 106 seen_slash = 1; 107 continue; 108 } else if(c == '*') { 109 if(seen_slash) { 110 level++; 111 seen_star = seen_slash = 0; 112 continue; 113 } 114 seen_star = 1; 115 continue; 116 } 117 seen_star = seen_slash = 0; 118 if(c == '\n') { 119 lineno++; 120 continue; 121 } 122 } 123 if(c == EOF) 124 error_message("unterminated comment, possibly started on line %d\n", start_lineno); 125 } 126 127 static char * 128 handle_string(void) 129 { 130 char x[1024]; 131 int i = 0; 132 int c; 133 int quote = 0; 134 while((c = input()) != EOF){ 135 if(quote) { 136 x[i++] = '\\'; 137 x[i++] = c; 138 quote = 0; 139 continue; 140 } 141 if(c == '\n'){ 142 error_message("unterminated string"); 143 lineno++; 144 break; 145 } 146 if(c == '\\'){ 147 quote++; 148 continue; 149 } 150 if(c == '\"') 151 break; 152 x[i++] = c; 153 } 154 x[i] = '\0'; 155 return strdup(x); 156 } 157 158 int 159 yywrap () 160 { 161 return 1; 162 } 163