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scan.l revision 1.2 
      1 /*	$NetBSD: scan.l,v 1.2 1997/11/09 20:59:18 phil 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 "y.tab.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 %%
     56 
     57 [ \t]+	{ /* ignore spaces and tabs */ }
     58 
     59 [\n]	{ line_no++; }
     60 
     61 "="|";"|","|"("|")"	{ return (int)yytext[0]; }
     62 
     63 x	{ return X; }
     64 
     65 y	{ return Y; }
     66 
     67 w	{ return W; }
     68 
     69 h	{ return H; }
     70 
     71 no	{ return NO; }
     72 
     73 box	{ return BOX; }
     74 
     75 sub	{ return SUB; }
     76 
     77 menu	{ return MENU; }
     78 
     79 next	{ return NEXT; }
     80 
     81 exit	{ return  EXIT; }
     82 
     83 title	{ return TITLE; }
     84 
     85 action	{ return ACTION; }
     86 
     87 endwin	{ return ENDWIN; }
     88 
     89 option	{ return OPTION; }
     90 
     91 default { return DEFAULT; }
     92 
     93 display { return DISPLAY; }
     94 
     95 error { return ERROR; }
     96 
     97 \"([^\"\n]*(\\\")?)*\"  {
     98 	  yylval.s_value = strdup (yytext);
     99 	  max_strlen = max_strlen > strlen(yytext)
    100 		       ? max_strlen : strlen(yytext) + 1;
    101 	  return STRING;
    102 	}
    103 
    104 [a-zA-Z][a-zA-Z0-9_]* {
    105 	  yylval.s_value = strdup(yytext);
    106 	  return(NAME);
    107 	}
    108 
    109 [0-9]+ {
    110 	  yylval.s_value = strdup(yytext);
    111 	  return(INT_CONST);
    112 	}
    113 
    114 "'"[^'\\]|(\\[athrn])|(\\[0-9][0-9]?[0-9]?)"'" {
    115 	  yylval.s_value = strdup(yytext);
    116 	  return(CHAR_CONST);
    117 	}
    118 
    119 "/*"  {	level = 1; comstart = line_no; BEGIN COMMENT; }
    120 
    121 <COMMENT>"/*" { level++; }
    122 
    123 <COMMENT>"*/" { if (level-- == 1) BEGIN 0; }
    124 
    125 <COMMENT>"\n" { line_no++; }
    126 
    127 <COMMENT><<EOF>> {
    128 		yyerror ("EOF inside a comment that started at line %d",
    129 			 comstart);
    130 		exit (1);
    131 	}
    132 
    133 <COMMENT>.  {/* eat character */}
    134 
    135 "{"	{ level = 1; BEGIN BRACE; }
    136 
    137 <BRACE>"{"	{ buff_add_ch(yytext[0]); level++; }
    138 
    139 <BRACE>"}"	{ if (level-- == 1)  {
    140 			BEGIN 0;
    141 			yylval.s_value = buff_copy();
    142 			return CODE;
    143 		  } else
    144 			buff_add_ch (yytext[0]);
    145 		}
    146 
    147 <BRACE>"\n"	{ buff_add_ch (yytext[0]); line_no++; }
    148 
    149 <BRACE>.	{ buff_add_ch (yytext[0]); }
    150 
    151 .       {
    152 	  if (yytext[0] < ' ')
    153 	    yyerror ("illegal character: ^%c",yytext[0] + '@');
    154 	  else
    155 	    if (yytext[0] > '~')
    156 	      yyerror ("illegal character: \\%3d", (int) yytext[0]);
    157 	    else
    158 	      yyerror ("illegal character: %s",yytext);
    159 
    160 	  /* To quiet the compiler */
    161 	  if (0) unput(0);
    162 	}
    163 %%
    164 
    165 #ifdef SCAN
    166 YYSTYPE yylval;
    167 
    168 main()
    169 {
    170   int val;
    171 
    172   line_no = 1;
    173   while ( (val = yylex()) != 0 )
    174     printf ("val = %d\n yytext = %s\n", val, yytext);
    175 }
    176 #endif
    177