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msgscan.l revision 1.1 
      1 /*	$NetBSD: msgscan.l,v 1.1 1997/09/26 21:16:38 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 message 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 
     49 %}
     50 
     51 %x COMMENT
     52 %x BRACE
     53 
     54 %%
     55 
     56 [ \t]+	{ /* ignore spaces and tabs */ }
     57 
     58 [\n]	{ line_no++; }
     59 
     60 ";"	{ return (int)yytext[0]; }
     61 
     62 message { return MESSAGE; }
     63 
     64 [a-zA-Z][a-zA-Z0-9_]* {
     65 	  yylval.s_value = strdup(yytext);
     66 	  return(NAME);
     67 	}
     68 
     69 "/*"  {	level = 1; BEGIN COMMENT;  }
     70 
     71 <COMMENT>"/*" { level++; }
     72 
     73 <COMMENT>"*/" { if (level-- == 1) BEGIN 0; }
     74 
     75 <COMMENT>"\n" { line_no++; }
     76 
     77 <COMMENT><<EOF>> { yyerror ("EOF inside a comment."); exit (1); }
     78 
     79 <COMMENT>.  {/* eat character */}
     80 
     81 "{"	{ level = 1; BEGIN BRACE; }
     82 
     83 <BRACE>"\\{"	{ buff_add_ch('{'); }
     84 
     85 <BRACE>"\\}"	{ buff_add_ch('}'); }
     86 
     87 <BRACE>"{"	{ buff_add_ch(yytext[0]); level++; }
     88 
     89 <BRACE>"}"	{ if (level-- == 1)  {
     90 			BEGIN 0;
     91 			yylval.s_value = buff_copy();
     92 			return VALUE;
     93 		  } else
     94 			buff_add_ch (yytext[0]);
     95 		}
     96 
     97 <BRACE>"\n"	{ buff_add_ch (yytext[0]); line_no++; }
     98 
     99 <BRACE>.	{ buff_add_ch (yytext[0]); }
    100 
    101 .       {
    102 	  if (yytext[0] < ' ')
    103 	    yyerror ("illegal character: ^%c",yytext[0] + '@');
    104 	  else
    105 	    if (yytext[0] > '~')
    106 	      yyerror ("illegal character: \\%3d", (int) yytext[0]);
    107 	    else
    108 	      yyerror ("illegal character: %s",yytext);
    109 
    110 	  /* To quiet the compiler */
    111 	  if (0) unput(0);
    112 	}
    113 %%
    114 
    115 #ifdef SCAN
    116 YYSTYPE yylval;
    117 
    118 main()
    119 {
    120   int val;
    121 
    122   line_no = 1;
    123   while ( (val = yylex()) != 0 )
    124     printf ("val = %d\n yytext = %s\n", val, yytext);
    125 }
    126 #endif
    127