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scan.l revision 1.18 
      1 /*	$NetBSD: scan.l,v 1.18 2019/02/25 20:47:37 martin 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 continuous { return CONTINUOUS; }
     74 
     75 sub	{ return SUB; }
     76 
     77 help	{ return HELP; }
     78 
     79 menu	{ return MENU; }
     80 
     81 menus	{ return MENUS; }
     82 
     83 next	{ return NEXT; }
     84 
     85 exit	{ return  EXIT; }
     86 
     87 exitstring { return  EXITSTRING; }
     88 
     89 title	{ return TITLE; }
     90 
     91 action	{ return ACTION; }
     92 
     93 endwin	{ return ENDWIN; }
     94 
     95 option	{ return OPTION; }
     96 
     97 default { return DEFAULT; }
     98 
     99 display { return DISPLAY; }
    100 
    101 expand { return EXPAND; }
    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