1 %{
2 /*
3 * Copyright (c) 2004 Kungliga Tekniska Högskolan
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"
45 unsigned lineno = 1;
46
47 static void handle_comment(void);
48 static char * handle_string(void);
49
50 #undef ECHO
51
52 %}
53
54 %option nounput
55
56 %%
57 [A-Za-z][-A-Za-z0-9_]* {
58 yylval.string = strdup ((const char *)yytext);
59 return LITERAL;
60 }
61 "\"" { yylval.string = handle_string(); return STRING; }
62 \n { ++lineno; }
63 \/\* { handle_comment(); }
64 [={}] { return *yytext; }
65 [ \t] ;
66 %%
67
68 void
69 error_message (const char *format, ...)
70 {
71 va_list args;
72
73 va_start (args, format);
74 fprintf (stderr, "%s:%d: ", filename, lineno);
75 vfprintf (stderr, format, args);
76 va_end (args);
77 error_flag++;
78 }
79
80 void
yyerror(char * s)81 yyerror (char *s)
82 {
83 error_message("%s\n", s);
84 }
85
86 static void
handle_comment(void)87 handle_comment(void)
88 {
89 int c;
90 int start_lineno = lineno;
91 int level = 1;
92 int seen_star = 0;
93 int seen_slash = 0;
94 while((c = input()) != EOF) {
95 if(c == '/') {
96 if(seen_star) {
97 if(--level == 0)
98 return;
99 seen_star = 0;
100 continue;
101 }
102 seen_slash = 1;
103 continue;
104 } else if(c == '*') {
105 if(seen_slash) {
106 level++;
107 seen_star = seen_slash = 0;
108 continue;
109 }
110 seen_star = 1;
111 continue;
112 }
113 seen_star = seen_slash = 0;
114 if(c == '\n') {
115 lineno++;
116 continue;
117 }
118 }
119 if(c == EOF)
120 error_message("unterminated comment, possibly started on line %d\n", start_lineno);
121 }
122
123 static char *
handle_string(void)124 handle_string(void)
125 {
126 char x[1024];
127 int i = 0;
128 int c;
129 int quote = 0;
130 while((c = input()) != EOF){
131 if(quote) {
132 x[i++] = '\\';
133 x[i++] = c;
134 quote = 0;
135 continue;
136 }
137 if(c == '\n'){
138 error_message("unterminated string");
139 lineno++;
140 break;
141 }
142 if(c == '\\'){
143 quote++;
144 continue;
145 }
146 if(c == '\"')
147 break;
148 x[i++] = c;
149 }
150 x[i] = '\0';
151 return strdup(x);
152 }
153
154 int
yywrap()155 yywrap ()
156 {
157 return 1;
158 }
159