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; 187 188 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