usr.bin/ctags/yacc.c

   1 /*      $NetBSD: yacc.c,v 1.11 2006/04/05 20:03:14 dsl Exp $    */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #if defined(__RCSID) && !defined(lint)
  38 #if 0
  39 static char sccsid[] = "@(#)yacc.c      8.3 (Berkeley) 4/2/94";
  40 #else
  41 __RCSID("$NetBSD: yacc.c,v 1.11 2006/04/05 20:03:14 dsl Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <ctype.h>
  46 #include <limits.h>
  47 #include <stdio.h>
  48 #include <string.h>
  49
  50 #include "ctags.h"
  51
  52 /*
  53  * y_entries:
  54  *      find the yacc tags and put them in.
  55  */
  56 void
  57 y_entries(void)
  58 {
  59         int     c;
  60         char    *sp;
  61         bool    in_rule;
  62         char    tok[MAXTOKEN];
  63
  64         in_rule = NO;
  65
  66         while (GETC(!=, EOF))
  67                 switch (c) {
  68                 case '\n':
  69                         SETLINE;
  70                         /* FALLTHROUGH */
  71                 case ' ':
  72                 case '\f':
  73                 case '\r':
  74                 case '\t':
  75                         break;
  76                 case '{':
  77                         if (skip_key('}'))
  78                                 in_rule = NO;
  79                         break;
  80                 case '\'':
  81                 case '"':
  82                         if (skip_key(c))
  83                                 in_rule = NO;
  84                         break;
  85                 case '%':
  86                         if (GETC(==, '%'))
  87                                 return;
  88                         (void)ungetc(c, inf);
  89                         break;
  90                 case '/':
  91                         if (GETC(==, '*'))
  92                                 skip_comment('*');
  93                         else
  94                                 (void)ungetc(c, inf);
  95                         break;
  96                 case '|':
  97                 case ';':
  98                         in_rule = NO;
  99                         break;
 100                 default:
 101                         if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
 102                                 break;
 103                         sp = tok;
 104                         *sp++ = c;
 105                         while (GETC(!=, EOF) && (intoken(c) || c == '.'))
 106                                 *sp++ = c;
 107                         *sp = EOS;
 108                         get_line();             /* may change before ':' */
 109                         if (c == EOF)
 110                                 return;
 111                         while (iswhite(c)) {
 112                                 if (c == '\n')
 113                                         SETLINE;
 114                                 if (GETC(==, EOF))
 115                                         return;
 116                         }
 117                         if (c == ':') {
 118                                 pfnote(tok, lineno);
 119                                 in_rule = YES;
 120                         }
 121                         else
 122                                 (void)ungetc(c, inf);
 123                 }
 124 }
 125
 126 /*
 127  * toss_yysec --
 128  *      throw away lines up to the next "\n%%\n"
 129  */
 130 void
 131 toss_yysec(void)
 132 {
 133         int     c;                      /* read character */
 134         int     state;
 135
 136         /*
 137          * state == 0 : waiting
 138          * state == 1 : received a newline
 139          * state == 2 : received first %
 140          * state == 3 : received second %
 141          */
 142         lineftell = ftell(inf);
 143         for (state = 0; GETC(!=, EOF);)
 144                 switch (c) {
 145                 case '\n':
 146                         ++lineno;
 147                         lineftell = ftell(inf);
 148                         if (state == 3)         /* done! */
 149                                 return;
 150                         state = 1;              /* start over */
 151                         break;
 152                 case '%':
 153                         if (state)              /* if 1 or 2 */
 154                                 ++state;        /* goto 3 */
 155                         break;
 156                 default:
 157                         state = 0;              /* reset */
 158                         break;
 159                 }
 160 }