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      1 /*	$NetBSD: msgscan.l,v 1.7 2012/03/06 16:26:01 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 message compiler. */
     37 
     38 #include <sys/cdefs.h>
     39 
     40 #if defined(__RCSID) && !defined(lint)
     41 __RCSID("$NetBSD: msgscan.l,v 1.7 2012/03/06 16:26:01 mbalmer Exp $");
     42 #endif
     43 
     44 
     45 #include <stdio.h>
     46 #include <string.h>
     47 #include "defs.h"
     48 #include "msgparse.h"
     49 
     50 static int level; 	/* For nested comments. */
     51 
     52 %}
     53 
     54 %x COMMENT
     55 %x BRACE
     56 
     57 %option noinput
     58 
     59 %%
     60 
     61 [ \t]+	{ /* ignore spaces and tabs */ }
     62 
     63 [\n]	{ line_no++; }
     64 
     65 ";"	{ return (int)yytext[0]; }
     66 
     67 message { return MESSAGE; }
     68 
     69 [a-zA-Z][a-zA-Z0-9_]* {
     70 	  yylval.s_value = strdup(yytext);
     71 	  return(NAME);
     72 	}
     73 
     74 "/*"  {	level = 1; BEGIN COMMENT;  }
     75 
     76 <COMMENT>"/*" { level++; }
     77 
     78 <COMMENT>"*/" { if (level-- == 1) BEGIN 0; }
     79 
     80 <COMMENT>"\n" { line_no++; }
     81 
     82 <COMMENT><<EOF>> { yyerror ("EOF inside a comment."); exit (1); }
     83 
     84 <COMMENT>.  {/* eat character */}
     85 
     86 "{"	{ level = 1; BEGIN BRACE; }
     87 
     88 <BRACE>"\\{"	{ buff_add_ch('{'); }
     89 
     90 <BRACE>"\\}"	{ buff_add_ch('}'); }
     91 
     92 <BRACE>"{"	{ buff_add_ch(yytext[0]); level++; }
     93 
     94 <BRACE>"}"	{ if (level-- == 1)  {
     95 			BEGIN 0;
     96 			yylval.s_value = buff_copy();
     97 			return VALUE;
     98 		  } else
     99 			buff_add_ch (yytext[0]);
    100 		}
    101 
    102 <BRACE>"\n"	{ buff_add_ch (yytext[0]); line_no++; }
    103 
    104 <BRACE>.	{ buff_add_ch (yytext[0]); }
    105 
    106 .       {
    107 	  if (yytext[0] < ' ')
    108 	    yyerror ("illegal character: ^%c",yytext[0] + '@');
    109 	  else
    110 	    if (yytext[0] > '~')
    111 	      yyerror ("illegal character: \\%3d", (int) yytext[0]);
    112 	    else
    113 	      yyerror ("illegal character: %s",yytext);
    114 
    115 	  /* To quiet the compiler */
    116 	  if (0) unput(0);
    117 	}
    118 %%
    119 
    120 #ifdef SCAN
    121 YYSTYPE yylval;
    122 
    123 main()
    124 {
    125   int val;
    126 
    127   line_no = 1;
    128   while ( (val = yylex()) != 0 )
    129     printf ("val = %d\n yytext = %s\n", val, yytext);
    130 }
    131 #endif
    132