contrib/texinfo-4/info/search.h

   1 /* search.h -- Structure used to search large bodies of text, with bounds.
   2    $Id: search.h,v 1.3 2004/04/11 17:56:46 karl Exp $
   3
   4    Copyright (C) 1993, 1997, 1998, 2002, 2004 Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20    Written by Brian Fox (bfox@ai.mit.edu). */
  21
  22 /* The search functions take two arguments:
  23
  24      1) a string to search for, and
  25
  26      2) a pointer to a SEARCH_BINDING which contains the buffer, start,
  27         and end of the search.
  28
  29    They return a long, which is the offset from the start of the buffer
  30    at which the match was found.  An offset of -1 indicates failure. */
  31
  32 #ifndef INFO_SEARCH_H
  33 #define INFO_SEARCH_H
  34
  35 typedef struct {
  36   char *buffer;                 /* The buffer of text to search. */
  37   long start;                   /* Offset of the start of the search. */
  38   long end;                     /* Offset of the end of the searh. */
  39   int flags;                    /* Flags controlling the type of search. */
  40 } SEARCH_BINDING;
  41
  42 #define S_FoldCase      0x01    /* Set means fold case in searches. */
  43 #define S_SkipDest      0x02    /* Set means return pointing after the dest. */
  44
  45 SEARCH_BINDING *make_binding (char *buffer, long int start, long int end);
  46 SEARCH_BINDING *copy_binding (SEARCH_BINDING *binding);
  47 extern long search_forward (char *string, SEARCH_BINDING *binding);
  48 extern long search_backward (char *input_string, SEARCH_BINDING *binding);
  49 extern long search (char *string, SEARCH_BINDING *binding);
  50 extern int looking_at (char *string, SEARCH_BINDING *binding);
  51
  52 /* Note that STRING_IN_LINE () always returns the offset of the 1st character
  53    after the string. */
  54 extern int string_in_line (char *string, char *line);
  55
  56 /* Function names that start with "skip" are passed a string, and return
  57    an offset from the start of that string.  Function names that start
  58    with "find" are passed a SEARCH_BINDING, and return an absolute position
  59    marker of the item being searched for.  "Find" functions return a value
  60    of -1 if the item being looked for couldn't be found. */
  61 extern int skip_whitespace (char *string);
  62 extern int skip_non_whitespace (char *string);
  63 extern int skip_whitespace_and_newlines (char *string);
  64 extern int skip_line (char *string);
  65 extern int skip_node_characters (char *string, int newlines_okay);
  66 extern int skip_node_separator (char *body);
  67
  68 #define DONT_SKIP_NEWLINES 0
  69 #define SKIP_NEWLINES 1
  70
  71 extern long find_node_separator (SEARCH_BINDING *binding);
  72 extern long find_tags_table (SEARCH_BINDING *binding);
  73 extern long find_node_in_binding (char *nodename, SEARCH_BINDING *binding);
  74
  75 #endif /* not INFO_SEARCH_H */