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  __attribute__((__format__(printf, 1, 2)));
73
74void
75error_message (const char *format, ...)
76{
77     va_list args;
78
79     va_start (args, format);
80     fprintf (stderr, "%s:%d: ", filename, lineno);
81     vfprintf (stderr, format, args);
82     va_end (args);
83     error_flag++;
84}
85
86void
87yyerror (char *s)
88{
89    error_message("%s\n", s);
90}
91
92static void
93handle_comment(void)
94{
95    int c;
96    int start_lineno = lineno;
97    int level = 1;
98    int seen_star = 0;
99    int seen_slash = 0;
100    while((c = input()) != EOF) {
101	if(c == '/') {
102	    if(seen_star) {
103		if(--level == 0)
104		    return;
105		seen_star = 0;
106		continue;
107	    }
108	    seen_slash = 1;
109	    continue;
110	} else 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
129static char *
130handle_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
160int
161yywrap ()
162{
163     return 1;
164}
165