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msgscan.l revision 1.5 
      1 /*	$NetBSD: msgscan.l,v 1.5 2009/10/29 14:37:56 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 message compiler. */
     41 
     42 #include <sys/cdefs.h>
     43 
     44 #if defined(__RCSID) && !defined(lint)
     45 __RCSID("$NetBSD: msgscan.l,v 1.5 2009/10/29 14:37:56 christos Exp $");
     46 #endif
     47 
     48 
     49 #include <stdio.h>
     50 #include <string.h>
     51 #include "defs.h"
     52 #include "msgparse.h"
     53 
     54 static int level; 	/* For nested comments. */
     55 
     56 %}
     57 
     58 %x COMMENT
     59 %x BRACE
     60 
     61 %option noinput
     62 
     63 %%
     64 
     65 [ \t]+	{ /* ignore spaces and tabs */ }
     66 
     67 [\n]	{ line_no++; }
     68 
     69 ";"	{ return (int)yytext[0]; }
     70 
     71 message { return MESSAGE; }
     72 
     73 [a-zA-Z][a-zA-Z0-9_]* {
     74 	  yylval.s_value = strdup(yytext);
     75 	  return(NAME);
     76 	}
     77 
     78 "/*"  {	level = 1; BEGIN COMMENT;  }
     79 
     80 <COMMENT>"/*" { level++; }
     81 
     82 <COMMENT>"*/" { if (level-- == 1) BEGIN 0; }
     83 
     84 <COMMENT>"\n" { line_no++; }
     85 
     86 <COMMENT><<EOF>> { yyerror ("EOF inside a comment."); exit (1); }
     87 
     88 <COMMENT>.  {/* eat character */}
     89 
     90 "{"	{ level = 1; BEGIN BRACE; }
     91 
     92 <BRACE>"\\{"	{ buff_add_ch('{'); }
     93 
     94 <BRACE>"\\}"	{ buff_add_ch('}'); }
     95 
     96 <BRACE>"{"	{ buff_add_ch(yytext[0]); level++; }
     97 
     98 <BRACE>"}"	{ if (level-- == 1)  {
     99 			BEGIN 0;
    100 			yylval.s_value = buff_copy();
    101 			return VALUE;
    102 		  } else
    103 			buff_add_ch (yytext[0]);
    104 		}
    105 
    106 <BRACE>"\n"	{ buff_add_ch (yytext[0]); line_no++; }
    107 
    108 <BRACE>.	{ buff_add_ch (yytext[0]); }
    109 
    110 .       {
    111 	  if (yytext[0] < ' ')
    112 	    yyerror ("illegal character: ^%c",yytext[0] + '@');
    113 	  else
    114 	    if (yytext[0] > '~')
    115 	      yyerror ("illegal character: \\%3d", (int) yytext[0]);
    116 	    else
    117 	      yyerror ("illegal character: %s",yytext);
    118 
    119 	  /* To quiet the compiler */
    120 	  if (0) unput(0);
    121 	}
    122 %%
    123 
    124 #ifdef SCAN
    125 YYSTYPE yylval;
    126 
    127 main()
    128 {
    129   int val;
    130 
    131   line_no = 1;
    132   while ( (val = yylex()) != 0 )
    133     printf ("val = %d\n yytext = %s\n", val, yytext);
    134 }
    135 #endif
    136