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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)yacc.c   8.3 (Berkeley) 4/2/94
  30  * $FreeBSD: head/usr.bin/ctags/yacc.c 299355 2016-05-10 11:11:23Z bapt $
  31  */
  32
  33 #include <ctype.h>
  34 #include <limits.h>
  35 #include <stdio.h>
  36
  37 #include "ctags.h"
  38
  39 /*
  40  * y_entries:
  41  *      find the yacc tags and put them in.
  42  */
  43 void
  44 y_entries(void)
  45 {
  46         int     c;
  47         char    *sp;
  48         bool    in_rule;
  49         char    tok[MAXTOKEN];
  50
  51         in_rule = NO;
  52
  53         while (GETC(!=, EOF))
  54                 switch (c) {
  55                 case '\n':
  56                         SETLINE;
  57                         /* FALLTHROUGH */
  58                 case ' ':
  59                 case '\f':
  60                 case '\r':
  61                 case '\t':
  62                         break;
  63                 case '{':
  64                         if (skip_key('}'))
  65                                 in_rule = NO;
  66                         break;
  67                 case '\'':
  68                 case '"':
  69                         if (skip_key(c))
  70                                 in_rule = NO;
  71                         break;
  72                 case '%':
  73                         if (GETC(==, '%'))
  74                                 return;
  75                         ungetc(c, inf);
  76                         break;
  77                 case '/':
  78                         if (GETC(==, '*') || c == '/')
  79                                 skip_comment(c);
  80                         else
  81                                 ungetc(c, inf);
  82                         break;
  83                 case '|':
  84                 case ';':
  85                         in_rule = NO;
  86                         break;
  87                 default:
  88                         if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
  89                                 break;
  90                         sp = tok;
  91                         *sp++ = c;
  92                         while (GETC(!=, EOF) && (intoken(c) || c == '.'))
  93                                 *sp++ = c;
  94                         *sp = EOS;
  95                         get_line();             /* may change before ':' */
  96                         while (iswhite(c)) {
  97                                 if (c == '\n')
  98                                         SETLINE;
  99                                 if (GETC(==, EOF))
 100                                         return;
 101                         }
 102                         if (c == ':') {
 103                                 pfnote(tok, lineno);
 104                                 in_rule = YES;
 105                         }
 106                         else
 107                                 ungetc(c, inf);
 108                 }
 109 }
 110
 111 /*
 112  * toss_yysec --
 113  *      throw away lines up to the next "\n%%\n"
 114  */
 115 void
 116 toss_yysec(void)
 117 {
 118         int     c;                      /* read character */
 119         int     state;
 120
 121         /*
 122          * state == 0 : waiting
 123          * state == 1 : received a newline
 124          * state == 2 : received first %
 125          * state == 3 : received second %
 126          */
 127         lineftell = ftell(inf);
 128         for (state = 0; GETC(!=, EOF);)
 129                 switch (c) {
 130                 case '\n':
 131                         ++lineno;
 132                         lineftell = ftell(inf);
 133                         if (state == 3)         /* done! */
 134                                 return;
 135                         state = 1;              /* start over */
 136                         break;
 137                 case '%':
 138                         if (state)              /* if 1 or 2 */
 139                                 ++state;        /* goto 3 */
 140                         break;
 141                 default:
 142                         state = 0;              /* reset */
 143                         break;
 144                 }
 145 }