1 /* $NetBSD: scan.l,v 1.15 2009/10/29 14:36:14 christos 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. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software develooped for the NetBSD Project by 20 * Piermont Information Systems Inc. 21 * 4. The name of Piermont Information Systems Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS'' 26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE 29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 35 * THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 */ 38 39 %{ 40 /* scan.l: scanner description for menu compiler. */ 41 42 #include <stdio.h> 43 #include <string.h> 44 #include "defs.h" 45 #include "parse.h" 46 47 static int level; /* For nested comments. */ 48 static int comstart; /* line number of comment start. */ 49 50 %} 51 52 %x COMMENT 53 %x BRACE 54 55 %option noinput 56 57 %% 58 59 [ \t]+ { /* ignore spaces and tabs */ } 60 61 [\n] { line_no++; } 62 63 "="|";"|","|"("|")" { return (int)yytext[0]; } 64 65 x { return X; } 66 67 y { return Y; } 68 69 w { return W; } 70 71 h { return H; } 72 73 no { return NO; } 74 75 box { return BOX; } 76 77 sub { return SUB; } 78 79 help { return HELP; } 80 81 menu { return MENU; } 82 83 menus { return MENUS; } 84 85 next { return NEXT; } 86 87 exit { return EXIT; } 88 89 exitstring { return EXITSTRING; } 90 91 title { return TITLE; } 92 93 action { return ACTION; } 94 95 endwin { return ENDWIN; } 96 97 option { return OPTION; } 98 99 default { return DEFAULT; } 100 101 display { return DISPLAY; } 102 103 error { return ERROR; } 104 105 allow { return ALLOW; } 106 107 dynamic { return DYNAMIC; } 108 109 messages { return MESSAGES; } 110 111 scrollable { return SCROLLABLE; } 112 113 shortcut { return SHORTCUT; } 114 115 clear { return CLEAR; } 116 117 always { return ALWAYS; } 118 119 scroll { return SCROLL; } 120 121 \"([^\"\n]*(\\\")?)*\" { 122 yylval.s_value = strdup (yytext); 123 max_strlen = max_strlen > strlen(yytext) 124 ? max_strlen : strlen(yytext) + 1; 125 return STRING; 126 } 127 128 [a-zA-Z][a-zA-Z0-9_]* { 129 yylval.s_value = strdup(yytext); 130 return(NAME); 131 } 132 133 0|[-1-9][0-9]* { 134 yylval.s_value = strdup(yytext); 135 return(INT_CONST); 136 } 137 138 "'"[^'\\]|(\\[athrn])|(\\[0-9][0-9]?[0-9]?)"'" { 139 yylval.s_value = strdup(yytext); 140 return(CHAR_CONST); 141 } 142 143 "/*" { level = 1; comstart = line_no; BEGIN COMMENT; } 144 145 <COMMENT>"/*" { level++; } 146 147 <COMMENT>"*/" { if (level-- == 1) BEGIN 0; } 148 149 <COMMENT>"\n" { line_no++; } 150 151 <COMMENT><<EOF>> { 152 yyerror ("EOF inside a comment that started at line %d", 153 comstart); 154 exit (1); 155 } 156 157 <COMMENT>. {/* eat character */} 158 159 "{" { level = 1; BEGIN BRACE; } 160 161 <BRACE>"{" { buff_add_ch(yytext[0]); level++; } 162 163 <BRACE>"}" { if (level-- == 1) { 164 BEGIN 0; 165 yylval.s_value = buff_copy(); 166 return CODE; 167 } else 168 buff_add_ch (yytext[0]); 169 } 170 171 <BRACE>"\n" { buff_add_ch (yytext[0]); line_no++; } 172 173 <BRACE>. { buff_add_ch (yytext[0]); } 174 175 . { 176 if (yytext[0] < ' ') 177 yyerror ("illegal character: ^%c",yytext[0] + '@'); 178 else 179 if (yytext[0] > '~') 180 yyerror ("illegal character: \\%3d", (int) yytext[0]); 181 else 182 yyerror ("illegal character: %s",yytext); 183 184 /* To quiet the compiler */ 185 if (0) unput(0); 186 } 187 %% 188 189 #ifdef SCAN 190 YYSTYPE yylval; 191 192 main() 193 { 194 int val; 195 196 line_no = 1; 197 while ( (val = yylex()) != 0 ) 198 printf ("val = %d\n yytext = %s\n", val, yytext); 199 } 200 #endif 201