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"
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