/* Buffer insertion/deletion and gap motion for XEmacs.
   Copyright (C) 1985-1994 Free Software Foundation, Inc.

This file is part of XEmacs.

XEmacs is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.

XEmacs is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with XEmacs.  If not, see <http://www.gnu.org/licenses/>. */

/* Synched up with: Not in FSF. */

/* Mostly rewritten by Ben Wing. */

#ifndef INCLUDED_insdel_h_
#define INCLUDED_insdel_h_

/************************************************************************/
/*                        changing a buffer's text                      */
/************************************************************************/

int begin_multiple_change (struct buffer *buf, Charbpos start, Charbpos end);
void end_multiple_change (struct buffer *buf, int count);

/* flags for functions below */

#define INSDEL_BEFORE_MARKERS 1
#define INSDEL_NO_LOCKING 2

Charcount buffer_insert_string_1 (struct buffer *buf, Charbpos pos,
				  const Ibyte *nonreloc, Lisp_Object reloc,
				  Bytecount offset, Bytecount length,
				  Charcount clen, int flags);
Charcount buffer_insert_raw_string_1 (struct buffer *buf, Charbpos pos,
				      const Ibyte *nonreloc,
				      Bytecount length, int flags);
Charcount buffer_insert_lisp_string_1 (struct buffer *buf, Charbpos pos,
				       Lisp_Object str, int flags);
Charcount buffer_insert_ascstring_1 (struct buffer *buf, Charbpos pos,
				    const Ascbyte *s, int flags);
Charcount buffer_insert_emacs_char_1 (struct buffer *buf, Charbpos pos,
				      Ichar ch, int flags);
Charcount buffer_insert_c_char_1 (struct buffer *buf, Charbpos pos, char c,
				  int flags);
Charcount buffer_insert_from_buffer_1 (struct buffer *buf, Charbpos pos,
				       struct buffer *buf2, Charbpos pos2,
				       Charcount length, int flags);

/* Macros for insertion functions that insert at point after markers.
   All of these can GC. */

#define buffer_insert_string(buf, nonreloc, reloc, offset, length) \
  buffer_insert_string_1 (buf, -1, nonreloc, reloc, offset, length, -1, 0)
#define buffer_insert_raw_string(buf, string, length) \
  buffer_insert_raw_string_1 (buf, -1, string, length, 0)
#define buffer_insert_ascstring(buf, s) \
  buffer_insert_ascstring_1 (buf, -1, s, 0)
#define buffer_insert_lisp_string(buf, str) \
  buffer_insert_lisp_string_1 (buf, -1, str, 0)
#define buffer_insert_c_char(buf, c) \
  buffer_insert_c_char_1 (buf, -1, c, 0)
#define buffer_insert_emacs_char(buf, ch) \
  buffer_insert_emacs_char_1 (buf, -1, ch, 0)
#define buffer_insert_from_buffer(buf, b, index, length) \
  buffer_insert_from_buffer_1 (buf, -1, b, index, length, 0)

void buffer_delete_range (struct buffer *buf, Charbpos from, Charbpos to,
			  int flags);
void buffer_replace_char (struct buffer *b, Charbpos pos, Ichar ch,
			  int not_real_change, int force_lock_check);


/************************************************************************/
/*                        tracking buffer changes                       */
/************************************************************************/

/* Split into two parts.  One part goes with a buffer's text (possibly
   shared), the other with the buffer itself. */

struct buffer_text_change_data
{
  /* multiple change stuff */
  int in_multiple_change;
  Charbpos mc_begin, mc_orig_end, mc_new_end;
  int mc_begin_signaled;
};

struct each_buffer_change_data
{
  Charcount begin_unchanged, end_unchanged;
  /* redisplay needs to know if a newline was deleted so its
     incremental-redisplay algorithm will fail */
  int newline_was_deleted;
  Charcount begin_extent_unchanged, end_extent_unchanged;
};

/* Number of characters at the beginning and end of the buffer that
   have not changed since the last call to buffer_reset_changes().
   If no changes have occurred since then, both values will be -1.

   "Changed" means that the text has changed. */

#define BUF_BEGIN_UNCHANGED(buf) ((buf)->changes->begin_unchanged)
#define BUF_END_UNCHANGED(buf) ((buf)->changes->end_unchanged)

/* Number of characters at the beginning and end of the buffer that
   have not had a covering extent change since the last call to
   buffer_reset_changes ().  If no changes have occurred since then,
   both values will be -1.

   "Changed" means that the extents covering the text have changed. */

#define BUF_EXTENT_BEGIN_UNCHANGED(buf) \
  ((buf)->changes->begin_extent_unchanged)
#define BUF_EXTENT_END_UNCHANGED(buf) \
  ((buf)->changes->end_extent_unchanged)

#define BUF_NEWLINE_WAS_DELETED(buf) \
  ((buf)->changes->newline_was_deleted)

void buffer_extent_signal_changed_region (struct buffer *buf,
					  Charbpos start,
					  Charbpos end);
void buffer_reset_changes (struct buffer *buf);



/************************************************************************/
/*                        other related functions                       */
/************************************************************************/

Membpos do_marker_adjustment (Membpos mpos, Membpos from,
			     Membpos to, Bytecount amount);

void fixup_internal_substring (const Ibyte *nonreloc,
			       Lisp_Object reloc,
			       Bytecount offset, Bytecount *len);

/* In font-lock.c */
void font_lock_maybe_update_syntactic_caches (struct buffer *buf,
					      Charbpos start,
					      Charbpos orig_end,
					      Charbpos new_end);
void font_lock_buffer_was_killed (struct buffer *buf);

void barf_if_buffer_read_only (struct buffer *buf, Charbpos from,
			       Charbpos to);

void init_buffer_text (struct buffer *b);
void uninit_buffer_text (struct buffer *b);

#endif /* INCLUDED_insdel_h_ */