1 /* $NetBSD: scan.l,v 1.16 2012/03/06 16:55:18 mbalmer Exp $ */
2
3 /*
4 * Copyright 1997 Piermont Information Systems Inc.
5 * All rights reserved.
6 *
7 * Written by Philip A. Nelson for Piermont Information Systems Inc.
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 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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 * 3. The name of Piermont Information Systems Inc. may not be used to endorse
18 * or promote products derived from this software without specific prior
19 * written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
31 * THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35 %{
36 /* scan.l: scanner description for menu compiler. */
37
38 #include <stdio.h>
39 #include <string.h>
40 #include "defs.h"
41 #include "parse.h"
42
43 static int level; /* For nested comments. */
44 static int comstart; /* line number of comment start. */
45
46 %}
47
48 %x COMMENT
49 %x BRACE
50
51 %option noinput
52
53 %%
54
55 [ \t]+ { /* ignore spaces and tabs */ }
56
57 [\n] { line_no++; }
58
59 "="|";"|","|"("|")" { return (int)yytext[0]; }
60
61 x { return X; }
62
63 y { return Y; }
64
65 w { return W; }
66
67 h { return H; }
68
69 no { return NO; }
70
71 box { return BOX; }
72
73 sub { return SUB; }
74
75 help { return HELP; }
76
77 menu { return MENU; }
78
79 menus { return MENUS; }
80
81 next { return NEXT; }
82
83 exit { return EXIT; }
84
85 exitstring { return EXITSTRING; }
86
87 title { return TITLE; }
88
89 action { return ACTION; }
90
91 endwin { return ENDWIN; }
92
93 option { return OPTION; }
94
95 default { return DEFAULT; }
96
97 display { return DISPLAY; }
98
99 error { return ERROR; }
100
101 allow { return ALLOW; }
102
103 dynamic { return DYNAMIC; }
104
105 messages { return MESSAGES; }
106
107 scrollable { return SCROLLABLE; }
108
109 shortcut { return SHORTCUT; }
110
111 clear { return CLEAR; }
112
113 always { return ALWAYS; }
114
115 scroll { return SCROLL; }
116
117 \"([^\"\n]*(\\\")?)*\" {
118 yylval.s_value = strdup (yytext);
119 max_strlen = max_strlen > strlen(yytext)
120 ? max_strlen : strlen(yytext) + 1;
121 return STRING;
122 }
123
124 [a-zA-Z][a-zA-Z0-9_]* {
125 yylval.s_value = strdup(yytext);
126 return(NAME);
127 }
128
129 0|[-1-9][0-9]* {
130 yylval.s_value = strdup(yytext);
131 return(INT_CONST);
132 }
133
134 "'"[^'\\]|(\\[athrn])|(\\[0-9][0-9]?[0-9]?)"'" {
135 yylval.s_value = strdup(yytext);
136 return(CHAR_CONST);
137 }
138
139 "/*" { level = 1; comstart = line_no; BEGIN COMMENT; }
140
141 <COMMENT>"/*" { level++; }
142
143 <COMMENT>"*/" { if (level-- == 1) BEGIN 0; }
144
145 <COMMENT>"\n" { line_no++; }
146
147 <COMMENT><<EOF>> {
148 yyerror ("EOF inside a comment that started at line %d",
149 comstart);
150 exit (1);
151 }
152
153 <COMMENT>. {/* eat character */}
154
155 "{" { level = 1; BEGIN BRACE; }
156
157 <BRACE>"{" { buff_add_ch(yytext[0]); level++; }
158
159 <BRACE>"}" { if (level-- == 1) {
160 BEGIN 0;
161 yylval.s_value = buff_copy();
162 return CODE;
163 } else
164 buff_add_ch (yytext[0]);
165 }
166
167 <BRACE>"\n" { buff_add_ch (yytext[0]); line_no++; }
168
169 <BRACE>. { buff_add_ch (yytext[0]); }
170
171 . {
172 if (yytext[0] < ' ')
173 yyerror ("illegal character: ^%c",yytext[0] + '@');
174 else
175 if (yytext[0] > '~')
176 yyerror ("illegal character: \\%3d", (int) yytext[0]);
177 else
178 yyerror ("illegal character: %s",yytext);
179
180 /* To quiet the compiler */
181 if (0) unput(0);
182 }
183 %%
184
185 #ifdef SCAN
186 YYSTYPE yylval;
187
main()188 main()
189 {
190 int val;
191
192 line_no = 1;
193 while ( (val = yylex()) != 0 )
194 printf ("val = %d\n yytext = %s\n", val, yytext);
195 }
196 #endif
197