usr.bin/ctags/yacc.c

   1 /*
   2  * Copyright (c) 1987, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * 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 THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)yacc.c   8.3 (Berkeley) 4/2/94
  34  * $FreeBSD: src/usr.bin/ctags/yacc.c,v 1.3.6.3 2002/07/30 00:55:07 tjr Exp $
  35  * $DragonFly: src/usr.bin/ctags/yacc.c,v 1.2 2003/06/17 04:29:25 dillon Exp $
  36  */
  37
  38 #include <ctype.h>
  39 #include <limits.h>
  40 #include <stdio.h>
  41
  42 #include "ctags.h"
  43
  44 /*
  45  * y_entries:
  46  *      find the yacc tags and put them in.
  47  */
  48 void
  49 y_entries(void)
  50 {
  51         int     c;
  52         char    *sp;
  53         bool    in_rule;
  54         char    tok[MAXTOKEN];
  55
  56         in_rule = NO;
  57
  58         while (GETC(!=, EOF))
  59                 switch (c) {
  60                 case '\n':
  61                         SETLINE;
  62                         /* FALLTHROUGH */
  63                 case ' ':
  64                 case '\f':
  65                 case '\r':
  66                 case '\t':
  67                         break;
  68                 case '{':
  69                         if (skip_key('}'))
  70                                 in_rule = NO;
  71                         break;
  72                 case '\'':
  73                 case '"':
  74                         if (skip_key(c))
  75                                 in_rule = NO;
  76                         break;
  77                 case '%':
  78                         if (GETC(==, '%'))
  79                                 return;
  80                         (void)ungetc(c, inf);
  81                         break;
  82                 case '/':
  83                         if (GETC(==, '*') || c == '/')
  84                                 skip_comment(c);
  85                         else
  86                                 (void)ungetc(c, inf);
  87                         break;
  88                 case '|':
  89                 case ';':
  90                         in_rule = NO;
  91                         break;
  92                 default:
  93                         if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
  94                                 break;
  95                         sp = tok;
  96                         *sp++ = c;
  97                         while (GETC(!=, EOF) && (intoken(c) || c == '.'))
  98                                 *sp++ = c;
  99                         *sp = EOS;
 100                         getline();              /* may change before ':' */
 101                         while (iswhite(c)) {
 102                                 if (c == '\n')
 103                                         SETLINE;
 104                                 if (GETC(==, EOF))
 105                                         return;
 106                         }
 107                         if (c == ':') {
 108                                 pfnote(tok, lineno);
 109                                 in_rule = YES;
 110                         }
 111                         else
 112                                 (void)ungetc(c, inf);
 113                 }
 114 }
 115
 116 /*
 117  * toss_yysec --
 118  *      throw away lines up to the next "\n%%\n"
 119  */
 120 void
 121 toss_yysec(void)
 122 {
 123         int     c;                      /* read character */
 124         int     state;
 125
 126         /*
 127          * state == 0 : waiting
 128          * state == 1 : received a newline
 129          * state == 2 : received first %
 130          * state == 3 : received second %
 131          */
 132         lineftell = ftell(inf);
 133         for (state = 0; GETC(!=, EOF);)
 134                 switch (c) {
 135                 case '\n':
 136                         ++lineno;
 137                         lineftell = ftell(inf);
 138                         if (state == 3)         /* done! */
 139                                 return;
 140                         state = 1;              /* start over */
 141                         break;
 142                 case '%':
 143                         if (state)              /* if 1 or 2 */
 144                                 ++state;        /* goto 3 */
 145                         break;
 146                 default:
 147                         state = 0;              /* reset */
 148                         break;
 149                 }
 150 }