1 /* Buffer insertion/deletion and gap motion for GNU Emacs.
2 Copyright (C) 1985, 86,93,94,95,97,98, 1999, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
25 #include "intervals.h"
27 #include "character.h"
29 #include "blockinput.h"
30 #include "region-cache.h"
36 static void insert_from_string_1
P_ ((Lisp_Object
, int, int, int, int, int, int));
37 static void insert_from_buffer_1 ();
38 static void gap_left
P_ ((int, int, int));
39 static void gap_right
P_ ((int, int));
40 static void adjust_markers_gap_motion
P_ ((int, int, int));
41 static void adjust_markers_for_insert
P_ ((int, int, int, int, int));
42 void adjust_markers_for_delete
P_ ((int, int, int, int));
43 static void adjust_markers_for_replace
P_ ((int, int, int, int, int, int));
44 static void adjust_point
P_ ((int, int));
46 Lisp_Object
Fcombine_after_change_execute ();
48 /* Non-nil means don't call the after-change-functions right away,
49 just record an element in Vcombine_after_change_calls_list. */
50 Lisp_Object Vcombine_after_change_calls
;
52 /* List of elements of the form (BEG-UNCHANGED END-UNCHANGED CHANGE-AMOUNT)
53 describing changes which happened while combine_after_change_calls
54 was nonzero. We use this to decide how to call them
55 once the deferral ends.
58 BEG-UNCHANGED is the number of chars before the changed range.
59 END-UNCHANGED is the number of chars after the changed range,
60 and CHANGE-AMOUNT is the number of characters inserted by the change
61 (negative for a deletion). */
62 Lisp_Object combine_after_change_list
;
64 /* Buffer which combine_after_change_list is about. */
65 Lisp_Object combine_after_change_buffer
;
67 Lisp_Object Qinhibit_modification_hooks
;
70 /* Check all markers in the current buffer, looking for something invalid. */
72 static int check_markers_debug_flag
;
74 #define CHECK_MARKERS() \
75 if (check_markers_debug_flag) \
82 register Lisp_Object tail
;
83 int multibyte
= ! NILP (current_buffer
->enable_multibyte_characters
);
85 tail
= BUF_MARKERS (current_buffer
);
89 if (XMARKER (tail
)->buffer
->text
!= current_buffer
->text
)
91 if (XMARKER (tail
)->charpos
> Z
)
93 if (XMARKER (tail
)->bytepos
> Z_BYTE
)
95 if (multibyte
&& ! CHAR_HEAD_P (FETCH_BYTE (XMARKER (tail
)->bytepos
)))
98 tail
= XMARKER (tail
)->chain
;
102 /* Move gap to position CHARPOS.
103 Note that this can quit! */
109 move_gap_both (charpos
, charpos_to_bytepos (charpos
));
112 /* Move gap to byte position BYTEPOS, which is also char position CHARPOS.
113 Note that this can quit! */
116 move_gap_both (charpos
, bytepos
)
117 int charpos
, bytepos
;
119 if (bytepos
< GPT_BYTE
)
120 gap_left (charpos
, bytepos
, 0);
121 else if (bytepos
> GPT_BYTE
)
122 gap_right (charpos
, bytepos
);
125 /* Move the gap to a position less than the current GPT.
126 BYTEPOS describes the new position as a byte position,
127 and CHARPOS is the corresponding char position.
128 If NEWGAP is nonzero, then don't update beg_unchanged and end_unchanged. */
131 gap_left (charpos
, bytepos
, newgap
)
132 register int charpos
, bytepos
;
135 register unsigned char *to
, *from
;
140 BUF_COMPUTE_UNCHANGED (current_buffer
, charpos
, GPT
);
147 /* Now copy the characters. To move the gap down,
148 copy characters up. */
152 /* I gets number of characters left to copy. */
153 i
= new_s1
- bytepos
;
156 /* If a quit is requested, stop copying now.
157 Change BYTEPOS to be where we have actually moved the gap to. */
161 charpos
= BYTE_TO_CHAR (bytepos
);
164 /* Move at most 32000 chars before checking again for a quit. */
169 /* bcopy is safe if the two areas of memory do not overlap
170 or on systems where bcopy is always safe for moving upward. */
171 && (BCOPY_UPWARD_SAFE
172 || to
- from
>= 128))
174 /* If overlap is not safe, avoid it by not moving too many
175 characters at once. */
176 if (!BCOPY_UPWARD_SAFE
&& i
> to
- from
)
191 /* Adjust markers, and buffer data structure, to put the gap at BYTEPOS.
192 BYTEPOS is where the loop above stopped, which may be what was specified
193 or may be where a quit was detected. */
194 adjust_markers_gap_motion (bytepos
, GPT_BYTE
, GAP_SIZE
);
197 if (bytepos
< charpos
)
199 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
203 /* Move the gap to a position greater than than the current GPT.
204 BYTEPOS describes the new position as a byte position,
205 and CHARPOS is the corresponding char position. */
208 gap_right (charpos
, bytepos
)
209 register int charpos
, bytepos
;
211 register unsigned char *to
, *from
;
215 BUF_COMPUTE_UNCHANGED (current_buffer
, charpos
, GPT
);
222 /* Now copy the characters. To move the gap up,
223 copy characters down. */
227 /* I gets number of characters left to copy. */
228 i
= bytepos
- new_s1
;
231 /* If a quit is requested, stop copying now.
232 Change BYTEPOS to be where we have actually moved the gap to. */
236 charpos
= BYTE_TO_CHAR (bytepos
);
239 /* Move at most 32000 chars before checking again for a quit. */
244 /* bcopy is safe if the two areas of memory do not overlap
245 or on systems where bcopy is always safe for moving downward. */
246 && (BCOPY_DOWNWARD_SAFE
247 || from
- to
>= 128))
249 /* If overlap is not safe, avoid it by not moving too many
250 characters at once. */
251 if (!BCOPY_DOWNWARD_SAFE
&& i
> from
- to
)
266 adjust_markers_gap_motion (GPT_BYTE
+ GAP_SIZE
, bytepos
+ GAP_SIZE
,
270 if (bytepos
< charpos
)
272 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
276 /* Add AMOUNT to the byte position of every marker in the current buffer
277 whose current byte position is between FROM (exclusive) and TO (inclusive).
279 Also, any markers past the outside of that interval, in the direction
280 of adjustment, are first moved back to the near end of the interval
281 and then adjusted by AMOUNT.
283 When the latter adjustment is done, if AMOUNT is negative,
284 we record the adjustment for undo. (This case happens only for
287 The markers' character positions are not altered,
288 because gap motion does not affect character positions. */
290 int adjust_markers_test
;
293 adjust_markers_gap_motion (from
, to
, amount
)
294 register int from
, to
, amount
;
296 /* Now that a marker has a bytepos, not counting the gap,
297 nothing needs to be done here. */
300 register struct Lisp_Marker
*m
;
303 marker
= BUF_MARKERS (current_buffer
);
305 while (!NILP (marker
))
307 m
= XMARKER (marker
);
311 if (mpos
> to
&& mpos
< to
+ amount
)
313 if (adjust_markers_test
)
320 /* Here's the case where a marker is inside text being deleted.
321 AMOUNT can be negative for gap motion, too,
322 but then this range contains no markers. */
323 if (mpos
> from
+ amount
&& mpos
<= from
)
325 if (adjust_markers_test
)
327 mpos
= from
+ amount
;
330 if (mpos
> from
&& mpos
<= to
)
338 /* Adjust all markers for a deletion
339 whose range in bytes is FROM_BYTE to TO_BYTE.
340 The range in charpos is FROM to TO.
342 This function assumes that the gap is adjacent to
343 or inside of the range being deleted. */
346 adjust_markers_for_delete (from
, from_byte
, to
, to_byte
)
347 register int from
, from_byte
, to
, to_byte
;
350 register struct Lisp_Marker
*m
;
351 register int charpos
;
353 marker
= BUF_MARKERS (current_buffer
);
355 while (!NILP (marker
))
357 m
= XMARKER (marker
);
358 charpos
= m
->charpos
;
363 /* If the marker is after the deletion,
364 relocate by number of chars / bytes deleted. */
367 m
->charpos
-= to
- from
;
368 m
->bytepos
-= to_byte
- from_byte
;
370 /* Here's the case where a marker is inside text being deleted. */
371 else if (charpos
> from
)
373 if (! m
->insertion_type
)
374 /* Normal markers will end up at the beginning of the
375 re-inserted text after undoing a deletion, and must be
376 adjusted to move them to the correct place. */
377 record_marker_adjustment (marker
, from
- charpos
);
378 else if (charpos
< to
)
379 /* Before-insertion markers will automatically move forward
380 upon re-inserting the deleted text, so we have to arrange
381 for them to move backward to the correct position. */
382 record_marker_adjustment (marker
, charpos
- to
);
385 m
->bytepos
= from_byte
;
387 /* Here's the case where a before-insertion marker is immediately
388 before the deleted region. */
389 else if (charpos
== from
&& m
->insertion_type
)
391 /* Undoing the change uses normal insertion, which will
392 incorrectly make MARKER move forward, so we arrange for it
393 to then move backward to the correct place at the beginning
394 of the deleted region. */
395 record_marker_adjustment (marker
, to
- from
);
403 /* Adjust markers for an insertion that stretches from FROM / FROM_BYTE
404 to TO / TO_BYTE. We have to relocate the charpos of every marker
405 that points after the insertion (but not their bytepos).
407 When a marker points at the insertion point,
408 we advance it if either its insertion-type is t
409 or BEFORE_MARKERS is true. */
412 adjust_markers_for_insert (from
, from_byte
, to
, to_byte
, before_markers
)
413 register int from
, from_byte
, to
, to_byte
;
418 int nchars
= to
- from
;
419 int nbytes
= to_byte
- from_byte
;
421 marker
= BUF_MARKERS (current_buffer
);
423 while (!NILP (marker
))
425 register struct Lisp_Marker
*m
= XMARKER (marker
);
427 /* In a single-byte buffer, a marker's two positions must be
431 if (m
->charpos
!= m
->bytepos
)
435 if (m
->bytepos
== from_byte
)
437 if (m
->insertion_type
|| before_markers
)
439 m
->bytepos
= to_byte
;
441 if (m
->insertion_type
)
445 else if (m
->bytepos
> from_byte
)
447 m
->bytepos
+= nbytes
;
448 m
->charpos
+= nchars
;
454 /* Adjusting only markers whose insertion-type is t may result in
455 disordered overlays in the slot `overlays_before'. */
457 fix_overlays_before (current_buffer
, from
, to
);
460 /* Adjust point for an insertion of NBYTES bytes, which are NCHARS characters.
462 This is used only when the value of point changes due to an insert
463 or delete; it does not represent a conceptual change in point as a
464 marker. In particular, point is not crossing any interval
465 boundaries, so there's no need to use the usual SET_PT macro. In
466 fact it would be incorrect to do so, because either the old or the
467 new value of point is out of sync with the current set of
471 adjust_point (nchars
, nbytes
)
474 BUF_PT (current_buffer
) += nchars
;
475 BUF_PT_BYTE (current_buffer
) += nbytes
;
477 /* In a single-byte buffer, the two positions must be equal. */
483 /* Adjust markers for a replacement of a text at FROM (FROM_BYTE) of
484 length OLD_CHARS (OLD_BYTES) to a new text of length NEW_CHARS
485 (NEW_BYTES). It is assumed that OLD_CHARS > 0, i.e., this is not
489 adjust_markers_for_replace (from
, from_byte
, old_chars
, old_bytes
,
490 new_chars
, new_bytes
)
491 int from
, from_byte
, old_chars
, old_bytes
, new_chars
, new_bytes
;
493 Lisp_Object marker
= BUF_MARKERS (current_buffer
);
494 int prev_to_byte
= from_byte
+ old_bytes
;
495 int diff_chars
= new_chars
- old_chars
;
496 int diff_bytes
= new_bytes
- old_bytes
;
498 while (!NILP (marker
))
500 register struct Lisp_Marker
*m
= XMARKER (marker
);
502 if (m
->bytepos
>= prev_to_byte
)
504 m
->charpos
+= diff_chars
;
505 m
->bytepos
+= diff_bytes
;
507 else if (m
->bytepos
> from_byte
)
510 m
->bytepos
= from_byte
;
520 /* Make the gap NBYTES_ADDED bytes longer. */
523 make_gap_larger (nbytes_added
)
528 int real_gap_loc_byte
;
531 /* If we have to get more space, get enough to last a while. */
532 nbytes_added
+= 2000;
534 /* Don't allow a buffer size that won't fit in an int
535 even if it will fit in a Lisp integer.
536 That won't work because so many places use `int'.
538 Make sure we don't introduce overflows in the calculation. */
540 if (Z_BYTE
- BEG_BYTE
+ GAP_SIZE
541 >= (((EMACS_INT
) 1 << (min (VALBITS
, BITS_PER_INT
) - 1)) - 1
543 error ("Buffer exceeds maximum size");
545 enlarge_buffer_text (current_buffer
, nbytes_added
);
547 /* Prevent quitting in move_gap. */
552 real_gap_loc_byte
= GPT_BYTE
;
553 old_gap_size
= GAP_SIZE
;
555 /* Call the newly allocated space a gap at the end of the whole space. */
557 GPT_BYTE
= Z_BYTE
+ GAP_SIZE
;
558 GAP_SIZE
= nbytes_added
;
560 /* Move the new gap down to be consecutive with the end of the old one.
561 This adjusts the markers properly too. */
562 gap_left (real_gap_loc
+ old_gap_size
, real_gap_loc_byte
+ old_gap_size
, 1);
564 /* Now combine the two into one large gap. */
565 GAP_SIZE
+= old_gap_size
;
567 GPT_BYTE
= real_gap_loc_byte
;
576 /* Make the gap NBYTES_REMOVED bytes shorted. */
579 make_gap_smaller (nbytes_removed
)
584 int real_gap_loc_byte
;
587 int real_beg_unchanged
;
590 /* Make sure the gap is at least 20 bytes. */
591 if (GAP_SIZE
- nbytes_removed
< 20)
592 nbytes_removed
= GAP_SIZE
- 20;
594 /* Prevent quitting in move_gap. */
599 real_gap_loc_byte
= GPT_BYTE
;
600 new_gap_size
= GAP_SIZE
- nbytes_removed
;
602 real_Z_byte
= Z_BYTE
;
603 real_beg_unchanged
= BEG_UNCHANGED
;
605 /* Pretend that the last unwanted part of the gap is the entire gap,
606 and that the first desired part of the gap is part of the buffer
608 bzero (GPT_ADDR
, new_gap_size
);
610 GPT_BYTE
+= new_gap_size
;
612 Z_BYTE
+= new_gap_size
;
613 GAP_SIZE
= nbytes_removed
;
615 /* Move the unwanted pretend gap to the end of the buffer. This
616 adjusts the markers properly too. */
617 gap_right (Z
, Z_BYTE
);
619 enlarge_buffer_text (current_buffer
, -nbytes_removed
);
621 /* Now restore the desired gap. */
622 GAP_SIZE
= new_gap_size
;
624 GPT_BYTE
= real_gap_loc_byte
;
626 Z_BYTE
= real_Z_byte
;
627 BEG_UNCHANGED
= real_beg_unchanged
;
636 make_gap (nbytes_added
)
639 if (nbytes_added
>= 0)
640 make_gap_larger (nbytes_added
);
641 #if defined USE_MMAP_FOR_BUFFERS || defined REL_ALLOC || defined DOUG_LEA_MALLOC
643 make_gap_smaller (-nbytes_added
);
647 /* Copy NBYTES bytes of text from FROM_ADDR to TO_ADDR.
648 FROM_MULTIBYTE says whether the incoming text is multibyte.
649 TO_MULTIBYTE says whether to store the text as multibyte.
650 If FROM_MULTIBYTE != TO_MULTIBYTE, we convert.
652 Return the number of bytes stored at TO_ADDR. */
655 copy_text (from_addr
, to_addr
, nbytes
,
656 from_multibyte
, to_multibyte
)
657 unsigned char *from_addr
;
658 unsigned char *to_addr
;
660 int from_multibyte
, to_multibyte
;
662 if (from_multibyte
== to_multibyte
)
664 bcopy (from_addr
, to_addr
, nbytes
);
667 else if (from_multibyte
)
670 int bytes_left
= nbytes
;
671 Lisp_Object tbl
= Qnil
;
673 while (bytes_left
> 0)
676 c
= STRING_CHAR_AND_LENGTH (from_addr
, bytes_left
, thislen
);
677 if (!SINGLE_BYTE_CHAR_P (c
))
678 c
= multibyte_char_to_unibyte (c
, tbl
);
680 from_addr
+= thislen
;
681 bytes_left
-= thislen
;
688 unsigned char *initial_to_addr
= to_addr
;
690 /* Convert single-byte to multibyte. */
693 int c
= *from_addr
++;
697 c
= unibyte_char_to_multibyte (c
);
698 to_addr
+= CHAR_STRING (c
, to_addr
);
702 /* Special case for speed. */
703 *to_addr
++ = c
, nbytes
--;
705 return to_addr
- initial_to_addr
;
709 /* Return the number of bytes it would take
710 to convert some single-byte text to multibyte.
711 The single-byte text consists of NBYTES bytes at PTR. */
714 count_size_as_multibyte (ptr
, nbytes
)
719 int outgoing_nbytes
= 0;
721 for (i
= 0; i
< nbytes
; i
++)
723 unsigned int c
= *ptr
++;
729 c
= unibyte_char_to_multibyte (c
);
730 outgoing_nbytes
+= CHAR_BYTES (c
);
734 return outgoing_nbytes
;
737 /* Insert a string of specified length before point.
738 This function judges multibyteness based on
739 enable_multibyte_characters in the current buffer;
740 it never converts between single-byte and multibyte.
742 DO NOT use this for the contents of a Lisp string or a Lisp buffer!
743 prepare_to_modify_buffer could relocate the text. */
746 insert (string
, nbytes
)
747 register unsigned char *string
;
753 insert_1 (string
, nbytes
, 0, 1, 0);
754 signal_after_change (opoint
, 0, PT
- opoint
);
755 update_compositions (opoint
, PT
, CHECK_BORDER
);
759 /* Likewise, but inherit text properties from neighboring characters. */
762 insert_and_inherit (string
, nbytes
)
763 register unsigned char *string
;
769 insert_1 (string
, nbytes
, 1, 1, 0);
770 signal_after_change (opoint
, 0, PT
- opoint
);
771 update_compositions (opoint
, PT
, CHECK_BORDER
);
775 /* Insert the character C before point. Do not inherit text properties. */
781 unsigned char str
[MAX_MULTIBYTE_LENGTH
];
784 if (! NILP (current_buffer
->enable_multibyte_characters
))
785 len
= CHAR_STRING (c
, str
);
795 /* Insert the null-terminated string S before point. */
801 insert (s
, strlen (s
));
804 /* Like `insert' except that all markers pointing at the place where
805 the insertion happens are adjusted to point after it.
806 Don't use this function to insert part of a Lisp string,
807 since gc could happen and relocate it. */
810 insert_before_markers (string
, nbytes
)
811 unsigned char *string
;
818 insert_1 (string
, nbytes
, 0, 1, 1);
819 signal_after_change (opoint
, 0, PT
- opoint
);
820 update_compositions (opoint
, PT
, CHECK_BORDER
);
824 /* Likewise, but inherit text properties from neighboring characters. */
827 insert_before_markers_and_inherit (string
, nbytes
)
828 unsigned char *string
;
835 insert_1 (string
, nbytes
, 1, 1, 1);
836 signal_after_change (opoint
, 0, PT
- opoint
);
837 update_compositions (opoint
, PT
, CHECK_BORDER
);
841 /* Subroutine used by the insert functions above. */
844 insert_1 (string
, nbytes
, inherit
, prepare
, before_markers
)
845 register unsigned char *string
;
847 int inherit
, prepare
, before_markers
;
849 insert_1_both (string
, chars_in_text (string
, nbytes
), nbytes
,
850 inherit
, prepare
, before_markers
);
854 #ifdef BYTE_COMBINING_DEBUG
856 /* See if the bytes before POS/POS_BYTE combine with bytes
857 at the start of STRING to form a single character.
858 If so, return the number of bytes at the start of STRING
859 which combine in this way. Otherwise, return 0. */
862 count_combining_before (string
, length
, pos
, pos_byte
)
863 unsigned char *string
;
867 int len
, combining_bytes
;
870 if (NILP (current_buffer
->enable_multibyte_characters
))
873 /* At first, we can exclude the following cases:
874 (1) STRING[0] can't be a following byte of multibyte sequence.
875 (2) POS is the start of the current buffer.
876 (3) A character before POS is not a multibyte character. */
877 if (length
== 0 || CHAR_HEAD_P (*string
)) /* case (1) */
879 if (pos_byte
== BEG_BYTE
) /* case (2) */
882 p
= BYTE_POS_ADDR (pos_byte
- 1);
883 while (! CHAR_HEAD_P (*p
)) p
--, len
++;
884 if (! BASE_LEADING_CODE_P (*p
)) /* case (3) */
887 combining_bytes
= BYTES_BY_CHAR_HEAD (*p
) - len
;
888 if (combining_bytes
<= 0)
889 /* The character preceding POS is, complete and no room for
890 combining bytes (combining_bytes == 0), or an independent 8-bit
891 character (combining_bytes < 0). */
894 /* We have a combination situation. Count the bytes at STRING that
897 while (!CHAR_HEAD_P (*p
) && p
< string
+ length
)
900 return (combining_bytes
< p
- string
? combining_bytes
: p
- string
);
903 /* See if the bytes after POS/POS_BYTE combine with bytes
904 at the end of STRING to form a single character.
905 If so, return the number of bytes after POS/POS_BYTE
906 which combine in this way. Otherwise, return 0. */
909 count_combining_after (string
, length
, pos
, pos_byte
)
910 unsigned char *string
;
914 int opos_byte
= pos_byte
;
919 if (NILP (current_buffer
->enable_multibyte_characters
))
922 /* At first, we can exclude the following cases:
923 (1) The last byte of STRING is an ASCII.
924 (2) POS is the last of the current buffer.
925 (3) A character at POS can't be a following byte of multibyte
927 if (length
> 0 && ASCII_BYTE_P (string
[length
- 1])) /* case (1) */
929 if (pos_byte
== Z_BYTE
) /* case (2) */
931 bufp
= BYTE_POS_ADDR (pos_byte
);
932 if (CHAR_HEAD_P (*bufp
)) /* case (3) */
936 while (i
>= 0 && ! CHAR_HEAD_P (string
[i
]))
942 /* All characters in STRING are not character head. We must
943 check also preceding bytes at POS. We are sure that the gap
945 unsigned char *p
= BEG_ADDR
;
947 while (i
>= 0 && ! CHAR_HEAD_P (p
[i
]))
949 if (i
< 0 || !BASE_LEADING_CODE_P (p
[i
]))
952 bytes
= BYTES_BY_CHAR_HEAD (p
[i
]);
953 return (bytes
<= pos_byte
- 1 - i
+ length
955 : bytes
- (pos_byte
- 1 - i
+ length
));
957 if (!BASE_LEADING_CODE_P (string
[i
]))
960 bytes
= BYTES_BY_CHAR_HEAD (string
[i
]) - (length
- i
);
962 while (!CHAR_HEAD_P (*bufp
)) bufp
++, pos_byte
++;
964 return (bytes
<= pos_byte
- opos_byte
? bytes
: pos_byte
- opos_byte
);
970 /* Insert a sequence of NCHARS chars which occupy NBYTES bytes
971 starting at STRING. INHERIT, PREPARE and BEFORE_MARKERS
972 are the same as in insert_1. */
975 insert_1_both (string
, nchars
, nbytes
, inherit
, prepare
, before_markers
)
976 register unsigned char *string
;
977 register int nchars
, nbytes
;
978 int inherit
, prepare
, before_markers
;
983 if (NILP (current_buffer
->enable_multibyte_characters
))
987 /* Do this before moving and increasing the gap,
988 because the before-change hooks might move the gap
989 or make it smaller. */
990 prepare_to_modify_buffer (PT
, PT
, NULL
);
993 move_gap_both (PT
, PT_BYTE
);
994 if (GAP_SIZE
< nbytes
)
995 make_gap (nbytes
- GAP_SIZE
);
997 #ifdef BYTE_COMBINING_DEBUG
998 if (count_combining_before (string
, nbytes
, PT
, PT_BYTE
)
999 || count_combining_after (string
, nbytes
, PT
, PT_BYTE
))
1003 /* Record deletion of the surrounding text that combines with
1004 the insertion. This, together with recording the insertion,
1005 will add up to the right stuff in the undo list. */
1006 record_insert (PT
, nchars
);
1009 bcopy (string
, GPT_ADDR
, nbytes
);
1018 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1023 adjust_overlays_for_insert (PT
, nchars
);
1024 adjust_markers_for_insert (PT
, PT_BYTE
,
1025 PT
+ nchars
, PT_BYTE
+ nbytes
,
1028 if (BUF_INTERVALS (current_buffer
) != 0)
1029 offset_intervals (current_buffer
, PT
, nchars
);
1031 if (!inherit
&& BUF_INTERVALS (current_buffer
) != 0)
1032 set_text_properties (make_number (PT
), make_number (PT
+ nchars
),
1035 adjust_point (nchars
, nbytes
);
1040 /* Insert a sequence of NCHARS chars which occupy NBYTES bytes
1041 starting at GPT_ADDR. This funciton assumes PT == GPT. */
1044 insert_from_gap (nchars
, nbytes
)
1045 register int nchars
, nbytes
;
1050 if (NILP (current_buffer
->enable_multibyte_characters
))
1053 record_insert (PT
, nchars
);
1063 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1068 adjust_overlays_for_insert (PT
, nchars
);
1069 adjust_markers_for_insert (PT
, PT_BYTE
,
1070 PT
+ nchars
, PT_BYTE
+ nbytes
,
1073 if (BUF_INTERVALS (current_buffer
) != 0)
1074 offset_intervals (current_buffer
, PT
, nchars
);
1076 adjust_point (nchars
, nbytes
);
1081 /* Insert the part of the text of STRING, a Lisp object assumed to be
1082 of type string, consisting of the LENGTH characters (LENGTH_BYTE bytes)
1083 starting at position POS / POS_BYTE. If the text of STRING has properties,
1084 copy them into the buffer.
1086 It does not work to use `insert' for this, because a GC could happen
1087 before we bcopy the stuff into the buffer, and relocate the string
1088 without insert noticing. */
1091 insert_from_string (string
, pos
, pos_byte
, length
, length_byte
, inherit
)
1093 register int pos
, pos_byte
, length
, length_byte
;
1097 insert_from_string_1 (string
, pos
, pos_byte
, length
, length_byte
,
1099 signal_after_change (opoint
, 0, PT
- opoint
);
1100 update_compositions (opoint
, PT
, CHECK_BORDER
);
1103 /* Like `insert_from_string' except that all markers pointing
1104 at the place where the insertion happens are adjusted to point after it. */
1107 insert_from_string_before_markers (string
, pos
, pos_byte
,
1108 length
, length_byte
, inherit
)
1110 register int pos
, pos_byte
, length
, length_byte
;
1114 insert_from_string_1 (string
, pos
, pos_byte
, length
, length_byte
,
1116 signal_after_change (opoint
, 0, PT
- opoint
);
1117 update_compositions (opoint
, PT
, CHECK_BORDER
);
1120 /* Subroutine of the insertion functions above. */
1123 insert_from_string_1 (string
, pos
, pos_byte
, nchars
, nbytes
,
1124 inherit
, before_markers
)
1126 register int pos
, pos_byte
, nchars
, nbytes
;
1127 int inherit
, before_markers
;
1129 struct gcpro gcpro1
;
1130 int outgoing_nbytes
= nbytes
;
1133 /* Make OUTGOING_NBYTES describe the text
1134 as it will be inserted in this buffer. */
1136 if (NILP (current_buffer
->enable_multibyte_characters
))
1137 outgoing_nbytes
= nchars
;
1138 else if (! STRING_MULTIBYTE (string
))
1140 = count_size_as_multibyte (&XSTRING (string
)->data
[pos_byte
],
1144 /* Do this before moving and increasing the gap,
1145 because the before-change hooks might move the gap
1146 or make it smaller. */
1147 prepare_to_modify_buffer (PT
, PT
, NULL
);
1150 move_gap_both (PT
, PT_BYTE
);
1151 if (GAP_SIZE
< outgoing_nbytes
)
1152 make_gap (outgoing_nbytes
- GAP_SIZE
);
1155 /* Copy the string text into the buffer, perhaps converting
1156 between single-byte and multibyte. */
1157 copy_text (XSTRING (string
)->data
+ pos_byte
, GPT_ADDR
, nbytes
,
1158 STRING_MULTIBYTE (string
),
1159 ! NILP (current_buffer
->enable_multibyte_characters
));
1161 #ifdef BYTE_COMBINING_DEBUG
1162 /* We have copied text into the gap, but we have not altered
1163 PT or PT_BYTE yet. So we can pass PT and PT_BYTE
1164 to these functions and get the same results as we would
1165 have got earlier on. Meanwhile, PT_ADDR does point to
1166 the text that has been stored by copy_text. */
1167 if (count_combining_before (GPT_ADDR
, outgoing_nbytes
, PT
, PT_BYTE
)
1168 || count_combining_after (GPT_ADDR
, outgoing_nbytes
, PT
, PT_BYTE
))
1172 record_insert (PT
, nchars
);
1175 GAP_SIZE
-= outgoing_nbytes
;
1179 GPT_BYTE
+= outgoing_nbytes
;
1180 ZV_BYTE
+= outgoing_nbytes
;
1181 Z_BYTE
+= outgoing_nbytes
;
1182 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1187 adjust_overlays_for_insert (PT
, nchars
);
1188 adjust_markers_for_insert (PT
, PT_BYTE
, PT
+ nchars
,
1189 PT_BYTE
+ outgoing_nbytes
,
1192 offset_intervals (current_buffer
, PT
, nchars
);
1194 intervals
= XSTRING (string
)->intervals
;
1195 /* Get the intervals for the part of the string we are inserting. */
1196 if (nbytes
< STRING_BYTES (XSTRING (string
)))
1197 intervals
= copy_intervals (intervals
, pos
, nchars
);
1199 /* Insert those intervals. */
1200 graft_intervals_into_buffer (intervals
, PT
, nchars
,
1201 current_buffer
, inherit
);
1203 adjust_point (nchars
, outgoing_nbytes
);
1206 /* Insert text from BUF, NCHARS characters starting at CHARPOS, into the
1207 current buffer. If the text in BUF has properties, they are absorbed
1208 into the current buffer.
1210 It does not work to use `insert' for this, because a malloc could happen
1211 and relocate BUF's text before the bcopy happens. */
1214 insert_from_buffer (buf
, charpos
, nchars
, inherit
)
1216 int charpos
, nchars
;
1221 insert_from_buffer_1 (buf
, charpos
, nchars
, inherit
);
1222 signal_after_change (opoint
, 0, PT
- opoint
);
1223 update_compositions (opoint
, PT
, CHECK_BORDER
);
1227 insert_from_buffer_1 (buf
, from
, nchars
, inherit
)
1232 register Lisp_Object temp
;
1233 int chunk
, chunk_expanded
;
1234 int from_byte
= buf_charpos_to_bytepos (buf
, from
);
1235 int to_byte
= buf_charpos_to_bytepos (buf
, from
+ nchars
);
1236 int incoming_nbytes
= to_byte
- from_byte
;
1237 int outgoing_nbytes
= incoming_nbytes
;
1240 /* Make OUTGOING_NBYTES describe the text
1241 as it will be inserted in this buffer. */
1243 if (NILP (current_buffer
->enable_multibyte_characters
))
1244 outgoing_nbytes
= nchars
;
1245 else if (NILP (buf
->enable_multibyte_characters
))
1247 int outgoing_before_gap
= 0;
1248 int outgoing_after_gap
= 0;
1250 if (from
< BUF_GPT (buf
))
1252 chunk
= BUF_GPT_BYTE (buf
) - from_byte
;
1253 if (chunk
> incoming_nbytes
)
1254 chunk
= incoming_nbytes
;
1256 = count_size_as_multibyte (BUF_BYTE_ADDRESS (buf
, from_byte
),
1262 if (chunk
< incoming_nbytes
)
1264 = count_size_as_multibyte (BUF_BYTE_ADDRESS (buf
,
1266 incoming_nbytes
- chunk
);
1268 outgoing_nbytes
= outgoing_before_gap
+ outgoing_after_gap
;
1271 /* Make sure point-max won't overflow after this insertion. */
1272 XSETINT (temp
, outgoing_nbytes
+ Z
);
1273 if (outgoing_nbytes
+ Z
!= XINT (temp
))
1274 error ("Maximum buffer size exceeded");
1276 /* Do this before moving and increasing the gap,
1277 because the before-change hooks might move the gap
1278 or make it smaller. */
1279 prepare_to_modify_buffer (PT
, PT
, NULL
);
1282 move_gap_both (PT
, PT_BYTE
);
1283 if (GAP_SIZE
< outgoing_nbytes
)
1284 make_gap (outgoing_nbytes
- GAP_SIZE
);
1286 if (from
< BUF_GPT (buf
))
1288 chunk
= BUF_GPT_BYTE (buf
) - from_byte
;
1289 if (chunk
> incoming_nbytes
)
1290 chunk
= incoming_nbytes
;
1291 /* Record number of output bytes, so we know where
1292 to put the output from the second copy_text. */
1294 = copy_text (BUF_BYTE_ADDRESS (buf
, from_byte
),
1296 ! NILP (buf
->enable_multibyte_characters
),
1297 ! NILP (current_buffer
->enable_multibyte_characters
));
1300 chunk_expanded
= chunk
= 0;
1302 if (chunk
< incoming_nbytes
)
1303 copy_text (BUF_BYTE_ADDRESS (buf
, from_byte
+ chunk
),
1304 GPT_ADDR
+ chunk_expanded
, incoming_nbytes
- chunk
,
1305 ! NILP (buf
->enable_multibyte_characters
),
1306 ! NILP (current_buffer
->enable_multibyte_characters
));
1308 #ifdef BYTE_COMBINING_DEBUG
1309 /* We have copied text into the gap, but we have not altered
1310 PT or PT_BYTE yet. So we can pass PT and PT_BYTE
1311 to these functions and get the same results as we would
1312 have got earlier on. Meanwhile, GPT_ADDR does point to
1313 the text that has been stored by copy_text. */
1314 if (count_combining_before (GPT_ADDR
, outgoing_nbytes
, PT
, PT_BYTE
)
1315 || count_combining_after (GPT_ADDR
, outgoing_nbytes
, PT
, PT_BYTE
))
1319 record_insert (PT
, nchars
);
1322 GAP_SIZE
-= outgoing_nbytes
;
1326 GPT_BYTE
+= outgoing_nbytes
;
1327 ZV_BYTE
+= outgoing_nbytes
;
1328 Z_BYTE
+= outgoing_nbytes
;
1329 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1334 adjust_overlays_for_insert (PT
, nchars
);
1335 adjust_markers_for_insert (PT
, PT_BYTE
, PT
+ nchars
,
1336 PT_BYTE
+ outgoing_nbytes
,
1339 if (BUF_INTERVALS (current_buffer
) != 0)
1340 offset_intervals (current_buffer
, PT
, nchars
);
1342 /* Get the intervals for the part of the string we are inserting. */
1343 intervals
= BUF_INTERVALS (buf
);
1344 if (outgoing_nbytes
< BUF_Z_BYTE (buf
) - BUF_BEG_BYTE (buf
))
1346 if (buf
== current_buffer
&& PT
<= from
)
1348 intervals
= copy_intervals (intervals
, from
, nchars
);
1351 /* Insert those intervals. */
1352 graft_intervals_into_buffer (intervals
, PT
, nchars
, current_buffer
, inherit
);
1354 adjust_point (nchars
, outgoing_nbytes
);
1357 /* Record undo information and adjust markers and position keepers for
1358 a replacement of a text PREV_TEXT at FROM to a new text of LEN
1359 chars (LEN_BYTE bytes) which resides in the gap just after
1362 PREV_TEXT nil means the new text was just inserted. */
1365 adjust_after_replace (from
, from_byte
, prev_text
, len
, len_byte
)
1366 int from
, from_byte
, len
, len_byte
;
1367 Lisp_Object prev_text
;
1369 int nchars_del
= 0, nbytes_del
= 0;
1371 #ifdef BYTE_COMBINING_DEBUG
1372 if (count_combining_before (GPT_ADDR
, len_byte
, from
, from_byte
)
1373 || count_combining_after (GPT_ADDR
, len_byte
, from
, from_byte
))
1377 if (STRINGP (prev_text
))
1379 nchars_del
= XSTRING (prev_text
)->size
;
1380 nbytes_del
= STRING_BYTES (XSTRING (prev_text
));
1383 /* Update various buffer positions for the new text. */
1384 GAP_SIZE
-= len_byte
;
1386 ZV_BYTE
+= len_byte
; Z_BYTE
+= len_byte
;
1387 GPT
+= len
; GPT_BYTE
+= len_byte
;
1388 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1391 adjust_markers_for_replace (from
, from_byte
, nchars_del
, nbytes_del
,
1394 adjust_markers_for_insert (from
, from_byte
,
1395 from
+ len
, from_byte
+ len_byte
, 0);
1397 if (! EQ (current_buffer
->undo_list
, Qt
))
1400 record_delete (from
, prev_text
);
1401 record_insert (from
, len
);
1404 if (len
> nchars_del
)
1405 adjust_overlays_for_insert (from
, len
- nchars_del
);
1406 else if (len
< nchars_del
)
1407 adjust_overlays_for_delete (from
, nchars_del
- len
);
1408 if (BUF_INTERVALS (current_buffer
) != 0)
1410 offset_intervals (current_buffer
, from
, len
- nchars_del
);
1414 adjust_point (len
- nchars_del
, len_byte
- nbytes_del
);
1416 /* As byte combining will decrease Z, we must check this again. */
1417 if (Z
- GPT
< END_UNCHANGED
)
1418 END_UNCHANGED
= Z
- GPT
;
1423 evaporate_overlays (from
);
1427 /* Like adjust_after_replace, but doesn't require PREV_TEXT.
1428 This is for use when undo is not enabled in the current buffer. */
1431 adjust_after_replace_noundo (from
, from_byte
, nchars_del
, nbytes_del
, len
, len_byte
)
1432 int from
, from_byte
, nchars_del
, nbytes_del
, len
, len_byte
;
1434 #ifdef BYTE_COMBINING_DEBUG
1435 if (count_combining_before (GPT_ADDR
, len_byte
, from
, from_byte
)
1436 || count_combining_after (GPT_ADDR
, len_byte
, from
, from_byte
))
1440 /* Update various buffer positions for the new text. */
1441 GAP_SIZE
-= len_byte
;
1443 ZV_BYTE
+= len_byte
; Z_BYTE
+= len_byte
;
1444 GPT
+= len
; GPT_BYTE
+= len_byte
;
1445 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1448 adjust_markers_for_replace (from
, from_byte
, nchars_del
, nbytes_del
,
1451 adjust_markers_for_insert (from
, from_byte
,
1452 from
+ len
, from_byte
+ len_byte
, 0);
1454 if (len
> nchars_del
)
1455 adjust_overlays_for_insert (from
, len
- nchars_del
);
1456 else if (len
< nchars_del
)
1457 adjust_overlays_for_delete (from
, nchars_del
- len
);
1458 if (BUF_INTERVALS (current_buffer
) != 0)
1460 offset_intervals (current_buffer
, from
, len
- nchars_del
);
1464 adjust_point (len
- nchars_del
, len_byte
- nbytes_del
);
1466 /* As byte combining will decrease Z, we must check this again. */
1467 if (Z
- GPT
< END_UNCHANGED
)
1468 END_UNCHANGED
= Z
- GPT
;
1473 evaporate_overlays (from
);
1477 /* Record undo information, adjust markers and position keepers for an
1478 insertion of a text from FROM (FROM_BYTE) to TO (TO_BYTE). The
1479 text already exists in the current buffer but character length (TO
1480 - FROM) may be incorrect, the correct length is NEWLEN. */
1483 adjust_after_insert (from
, from_byte
, to
, to_byte
, newlen
)
1484 int from
, from_byte
, to
, to_byte
, newlen
;
1486 int len
= to
- from
, len_byte
= to_byte
- from_byte
;
1489 move_gap_both (to
, to_byte
);
1490 GAP_SIZE
+= len_byte
;
1491 GPT
-= len
; GPT_BYTE
-= len_byte
;
1492 ZV
-= len
; ZV_BYTE
-= len_byte
;
1493 Z
-= len
; Z_BYTE
-= len_byte
;
1494 adjust_after_replace (from
, from_byte
, Qnil
, newlen
, len_byte
);
1497 /* Replace the text from character positions FROM to TO with NEW,
1498 If PREPARE is nonzero, call prepare_to_modify_buffer.
1499 If INHERIT, the newly inserted text should inherit text properties
1500 from the surrounding non-deleted text. */
1502 /* Note that this does not yet handle markers quite right.
1503 Also it needs to record a single undo-entry that does a replacement
1504 rather than a separate delete and insert.
1505 That way, undo will also handle markers properly.
1507 But if MARKERS is 0, don't relocate markers. */
1510 replace_range (from
, to
, new, prepare
, inherit
, markers
)
1512 int from
, to
, prepare
, inherit
, markers
;
1514 int inschars
= XSTRING (new)->size
;
1515 int insbytes
= STRING_BYTES (XSTRING (new));
1516 int from_byte
, to_byte
;
1517 int nbytes_del
, nchars_del
;
1518 register Lisp_Object temp
;
1519 struct gcpro gcpro1
;
1521 int outgoing_insbytes
= insbytes
;
1522 Lisp_Object deletion
;
1531 int range_length
= to
- from
;
1532 prepare_to_modify_buffer (from
, to
, &from
);
1533 to
= from
+ range_length
;
1538 /* Make args be valid */
1544 from_byte
= CHAR_TO_BYTE (from
);
1545 to_byte
= CHAR_TO_BYTE (to
);
1547 nchars_del
= to
- from
;
1548 nbytes_del
= to_byte
- from_byte
;
1550 if (nbytes_del
<= 0 && insbytes
== 0)
1553 /* Make OUTGOING_INSBYTES describe the text
1554 as it will be inserted in this buffer. */
1556 if (NILP (current_buffer
->enable_multibyte_characters
))
1557 outgoing_insbytes
= inschars
;
1558 else if (! STRING_MULTIBYTE (new))
1560 = count_size_as_multibyte (XSTRING (new)->data
, insbytes
);
1562 /* Make sure point-max won't overflow after this insertion. */
1563 XSETINT (temp
, Z_BYTE
- nbytes_del
+ insbytes
);
1564 if (Z_BYTE
- nbytes_del
+ insbytes
!= XINT (temp
))
1565 error ("Maximum buffer size exceeded");
1569 /* Make sure the gap is somewhere in or next to what we are deleting. */
1571 gap_right (from
, from_byte
);
1573 gap_left (to
, to_byte
, 0);
1575 /* Even if we don't record for undo, we must keep the original text
1576 because we may have to recover it because of inappropriate byte
1578 if (! EQ (current_buffer
->undo_list
, Qt
))
1579 deletion
= make_buffer_string_both (from
, from_byte
, to
, to_byte
, 1);
1581 GAP_SIZE
+= nbytes_del
;
1584 ZV_BYTE
-= nbytes_del
;
1585 Z_BYTE
-= nbytes_del
;
1587 GPT_BYTE
= from_byte
;
1588 *(GPT_ADDR
) = 0; /* Put an anchor. */
1593 if (GPT
- BEG
< BEG_UNCHANGED
)
1594 BEG_UNCHANGED
= GPT
- BEG
;
1595 if (Z
- GPT
< END_UNCHANGED
)
1596 END_UNCHANGED
= Z
- GPT
;
1598 if (GAP_SIZE
< insbytes
)
1599 make_gap (insbytes
- GAP_SIZE
);
1601 /* Copy the string text into the buffer, perhaps converting
1602 between single-byte and multibyte. */
1603 copy_text (XSTRING (new)->data
, GPT_ADDR
, insbytes
,
1604 STRING_MULTIBYTE (new),
1605 ! NILP (current_buffer
->enable_multibyte_characters
));
1607 #ifdef BYTE_COMBINING_DEBUG
1608 /* We have copied text into the gap, but we have not marked
1609 it as part of the buffer. So we can use the old FROM and FROM_BYTE
1610 here, for both the previous text and the following text.
1611 Meanwhile, GPT_ADDR does point to
1612 the text that has been stored by copy_text. */
1613 if (count_combining_before (GPT_ADDR
, outgoing_insbytes
, from
, from_byte
)
1614 || count_combining_after (GPT_ADDR
, outgoing_insbytes
, from
, from_byte
))
1618 if (! EQ (current_buffer
->undo_list
, Qt
))
1620 record_delete (from
, deletion
);
1621 record_insert (from
, inschars
);
1624 GAP_SIZE
-= outgoing_insbytes
;
1628 GPT_BYTE
+= outgoing_insbytes
;
1629 ZV_BYTE
+= outgoing_insbytes
;
1630 Z_BYTE
+= outgoing_insbytes
;
1631 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1636 /* Adjust the overlay center as needed. This must be done after
1637 adjusting the markers that bound the overlays. */
1638 adjust_overlays_for_delete (from
, nchars_del
);
1639 adjust_overlays_for_insert (from
, inschars
);
1641 /* Adjust markers for the deletion and the insertion. */
1643 adjust_markers_for_replace (from
, from_byte
, nchars_del
, nbytes_del
,
1644 inschars
, outgoing_insbytes
);
1646 offset_intervals (current_buffer
, from
, inschars
- nchars_del
);
1648 /* Get the intervals for the part of the string we are inserting--
1649 not including the combined-before bytes. */
1650 intervals
= XSTRING (new)->intervals
;
1651 /* Insert those intervals. */
1652 graft_intervals_into_buffer (intervals
, from
, inschars
,
1653 current_buffer
, inherit
);
1655 /* Relocate point as if it were a marker. */
1657 adjust_point ((from
+ inschars
- (PT
< to
? PT
: to
)),
1658 (from_byte
+ outgoing_insbytes
1659 - (PT_BYTE
< to_byte
? PT_BYTE
: to_byte
)));
1661 if (outgoing_insbytes
== 0)
1662 evaporate_overlays (from
);
1669 signal_after_change (from
, nchars_del
, GPT
- from
);
1670 update_compositions (from
, GPT
, CHECK_BORDER
);
1673 /* Delete characters in current buffer
1674 from FROM up to (but not including) TO.
1675 If TO comes before FROM, we delete nothing. */
1678 del_range (from
, to
)
1679 register int from
, to
;
1681 del_range_1 (from
, to
, 1, 0);
1684 /* Like del_range; PREPARE says whether to call prepare_to_modify_buffer.
1685 RET_STRING says to return the deleted text. */
1688 del_range_1 (from
, to
, prepare
, ret_string
)
1689 int from
, to
, prepare
, ret_string
;
1691 int from_byte
, to_byte
;
1692 Lisp_Object deletion
;
1693 struct gcpro gcpro1
;
1695 /* Make args be valid */
1706 int range_length
= to
- from
;
1707 prepare_to_modify_buffer (from
, to
, &from
);
1708 to
= min (ZV
, from
+ range_length
);
1711 from_byte
= CHAR_TO_BYTE (from
);
1712 to_byte
= CHAR_TO_BYTE (to
);
1714 deletion
= del_range_2 (from
, from_byte
, to
, to_byte
, ret_string
);
1716 signal_after_change (from
, to
- from
, 0);
1717 update_compositions (from
, from
, CHECK_HEAD
);
1722 /* Like del_range_1 but args are byte positions, not char positions. */
1725 del_range_byte (from_byte
, to_byte
, prepare
)
1726 int from_byte
, to_byte
, prepare
;
1730 /* Make args be valid */
1731 if (from_byte
< BEGV_BYTE
)
1732 from_byte
= BEGV_BYTE
;
1733 if (to_byte
> ZV_BYTE
)
1736 if (to_byte
<= from_byte
)
1739 from
= BYTE_TO_CHAR (from_byte
);
1740 to
= BYTE_TO_CHAR (to_byte
);
1744 int old_from
= from
, old_to
= Z
- to
;
1745 int range_length
= to
- from
;
1746 prepare_to_modify_buffer (from
, to
, &from
);
1747 to
= from
+ range_length
;
1749 if (old_from
!= from
)
1750 from_byte
= CHAR_TO_BYTE (from
);
1756 else if (old_to
== Z
- to
)
1757 to_byte
= CHAR_TO_BYTE (to
);
1760 del_range_2 (from
, from_byte
, to
, to_byte
, 0);
1761 signal_after_change (from
, to
- from
, 0);
1762 update_compositions (from
, from
, CHECK_HEAD
);
1765 /* Like del_range_1, but positions are specified both as charpos
1769 del_range_both (from
, from_byte
, to
, to_byte
, prepare
)
1770 int from
, from_byte
, to
, to_byte
, prepare
;
1772 /* Make args be valid */
1773 if (from_byte
< BEGV_BYTE
)
1774 from_byte
= BEGV_BYTE
;
1775 if (to_byte
> ZV_BYTE
)
1778 if (to_byte
<= from_byte
)
1788 int old_from
= from
, old_to
= Z
- to
;
1789 int range_length
= to
- from
;
1790 prepare_to_modify_buffer (from
, to
, &from
);
1791 to
= from
+ range_length
;
1793 if (old_from
!= from
)
1794 from_byte
= CHAR_TO_BYTE (from
);
1800 else if (old_to
== Z
- to
)
1801 to_byte
= CHAR_TO_BYTE (to
);
1804 del_range_2 (from
, from_byte
, to
, to_byte
, 0);
1805 signal_after_change (from
, to
- from
, 0);
1806 update_compositions (from
, from
, CHECK_HEAD
);
1809 /* Delete a range of text, specified both as character positions
1810 and byte positions. FROM and TO are character positions,
1811 while FROM_BYTE and TO_BYTE are byte positions.
1812 If RET_STRING is true, the deleted area is returned as a string. */
1815 del_range_2 (from
, from_byte
, to
, to_byte
, ret_string
)
1816 int from
, from_byte
, to
, to_byte
, ret_string
;
1818 register int nbytes_del
, nchars_del
;
1819 Lisp_Object deletion
;
1823 nchars_del
= to
- from
;
1824 nbytes_del
= to_byte
- from_byte
;
1826 /* Make sure the gap is somewhere in or next to what we are deleting. */
1828 gap_right (from
, from_byte
);
1830 gap_left (to
, to_byte
, 0);
1832 #ifdef BYTE_COMBINING_DEBUG
1833 if (count_combining_before (BUF_BYTE_ADDRESS (current_buffer
, to_byte
),
1834 Z_BYTE
- to_byte
, from
, from_byte
))
1838 if (ret_string
|| ! EQ (current_buffer
->undo_list
, Qt
))
1839 deletion
= make_buffer_string_both (from
, from_byte
, to
, to_byte
, 1);
1843 /* Relocate all markers pointing into the new, larger gap
1844 to point at the end of the text before the gap.
1845 Do this before recording the deletion,
1846 so that undo handles this after reinserting the text. */
1847 adjust_markers_for_delete (from
, from_byte
, to
, to_byte
);
1849 if (! EQ (current_buffer
->undo_list
, Qt
))
1850 record_delete (from
, deletion
);
1853 /* Relocate point as if it were a marker. */
1855 adjust_point (from
- (PT
< to
? PT
: to
),
1856 from_byte
- (PT_BYTE
< to_byte
? PT_BYTE
: to_byte
));
1858 offset_intervals (current_buffer
, from
, - nchars_del
);
1860 /* Adjust the overlay center as needed. This must be done after
1861 adjusting the markers that bound the overlays. */
1862 adjust_overlays_for_delete (from
, nchars_del
);
1864 GAP_SIZE
+= nbytes_del
;
1865 ZV_BYTE
-= nbytes_del
;
1866 Z_BYTE
-= nbytes_del
;
1870 GPT_BYTE
= from_byte
;
1871 *(GPT_ADDR
) = 0; /* Put an anchor. */
1876 if (GPT
- BEG
< BEG_UNCHANGED
)
1877 BEG_UNCHANGED
= GPT
- BEG
;
1878 if (Z
- GPT
< END_UNCHANGED
)
1879 END_UNCHANGED
= Z
- GPT
;
1883 evaporate_overlays (from
);
1888 /* Call this if you're about to change the region of BUFFER from
1889 character positions START to END. This checks the read-only
1890 properties of the region, calls the necessary modification hooks,
1891 and warns the next redisplay that it should pay attention to that
1895 modify_region (buffer
, start
, end
)
1896 struct buffer
*buffer
;
1899 struct buffer
*old_buffer
= current_buffer
;
1901 if (buffer
!= old_buffer
)
1902 set_buffer_internal (buffer
);
1904 prepare_to_modify_buffer (start
, end
, NULL
);
1906 BUF_COMPUTE_UNCHANGED (buffer
, start
- 1, end
);
1908 if (MODIFF
<= SAVE_MODIFF
)
1909 record_first_change ();
1912 buffer
->point_before_scroll
= Qnil
;
1914 if (buffer
!= old_buffer
)
1915 set_buffer_internal (old_buffer
);
1918 /* Check that it is okay to modify the buffer between START and END,
1919 which are char positions.
1921 Run the before-change-function, if any. If intervals are in use,
1922 verify that the text to be modified is not read-only, and call
1923 any modification properties the text may have.
1925 If PRESERVE_PTR is nonzero, we relocate *PRESERVE_PTR
1926 by holding its value temporarily in a marker. */
1929 prepare_to_modify_buffer (start
, end
, preserve_ptr
)
1933 if (!NILP (current_buffer
->read_only
))
1934 Fbarf_if_buffer_read_only ();
1936 /* Let redisplay consider other windows than selected_window
1937 if modifying another buffer. */
1938 if (XBUFFER (XWINDOW (selected_window
)->buffer
) != current_buffer
)
1939 ++windows_or_buffers_changed
;
1941 if (BUF_INTERVALS (current_buffer
) != 0)
1945 Lisp_Object preserve_marker
;
1946 struct gcpro gcpro1
;
1947 preserve_marker
= Fcopy_marker (make_number (*preserve_ptr
), Qnil
);
1948 GCPRO1 (preserve_marker
);
1949 verify_interval_modification (current_buffer
, start
, end
);
1950 *preserve_ptr
= marker_position (preserve_marker
);
1951 unchain_marker (preserve_marker
);
1955 verify_interval_modification (current_buffer
, start
, end
);
1958 #ifdef CLASH_DETECTION
1959 if (!NILP (current_buffer
->file_truename
)
1960 /* Make binding buffer-file-name to nil effective. */
1961 && !NILP (current_buffer
->filename
)
1962 && SAVE_MODIFF
>= MODIFF
)
1963 lock_file (current_buffer
->file_truename
);
1965 /* At least warn if this file has changed on disk since it was visited. */
1966 if (!NILP (current_buffer
->filename
)
1967 && SAVE_MODIFF
>= MODIFF
1968 && NILP (Fverify_visited_file_modtime (Fcurrent_buffer ()))
1969 && !NILP (Ffile_exists_p (current_buffer
->filename
)))
1970 call1 (intern ("ask-user-about-supersession-threat"),
1971 current_buffer
->filename
);
1972 #endif /* not CLASH_DETECTION */
1974 signal_before_change (start
, end
, preserve_ptr
);
1976 if (current_buffer
->newline_cache
)
1977 invalidate_region_cache (current_buffer
,
1978 current_buffer
->newline_cache
,
1979 start
- BEG
, Z
- end
);
1980 if (current_buffer
->width_run_cache
)
1981 invalidate_region_cache (current_buffer
,
1982 current_buffer
->width_run_cache
,
1983 start
- BEG
, Z
- end
);
1985 Vdeactivate_mark
= Qt
;
1988 /* These macros work with an argument named `preserve_ptr'
1989 and a local variable named `preserve_marker'. */
1991 #define PRESERVE_VALUE \
1992 if (preserve_ptr && NILP (preserve_marker)) \
1993 preserve_marker = Fcopy_marker (make_number (*preserve_ptr), Qnil)
1995 #define RESTORE_VALUE \
1996 if (! NILP (preserve_marker)) \
1998 *preserve_ptr = marker_position (preserve_marker); \
1999 unchain_marker (preserve_marker); \
2002 #define PRESERVE_START_END \
2003 if (NILP (start_marker)) \
2004 start_marker = Fcopy_marker (start, Qnil); \
2005 if (NILP (end_marker)) \
2006 end_marker = Fcopy_marker (end, Qnil);
2008 #define FETCH_START \
2009 (! NILP (start_marker) ? Fmarker_position (start_marker) : start)
2012 (! NILP (end_marker) ? Fmarker_position (end_marker) : end)
2014 /* Signal a change to the buffer immediately before it happens.
2015 START_INT and END_INT are the bounds of the text to be changed.
2017 If PRESERVE_PTR is nonzero, we relocate *PRESERVE_PTR
2018 by holding its value temporarily in a marker. */
2021 signal_before_change (start_int
, end_int
, preserve_ptr
)
2022 int start_int
, end_int
;
2025 Lisp_Object start
, end
;
2026 Lisp_Object start_marker
, end_marker
;
2027 Lisp_Object preserve_marker
;
2028 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2030 if (inhibit_modification_hooks
)
2033 start
= make_number (start_int
);
2034 end
= make_number (end_int
);
2035 preserve_marker
= Qnil
;
2036 start_marker
= Qnil
;
2038 GCPRO3 (preserve_marker
, start_marker
, end_marker
);
2040 /* If buffer is unmodified, run a special hook for that case. */
2041 if (SAVE_MODIFF
>= MODIFF
2042 && !NILP (Vfirst_change_hook
)
2043 && !NILP (Vrun_hooks
))
2047 call1 (Vrun_hooks
, Qfirst_change_hook
);
2050 /* Now run the before-change-functions if any. */
2051 if (!NILP (Vbefore_change_functions
))
2053 Lisp_Object args
[3];
2054 Lisp_Object before_change_functions
;
2055 Lisp_Object after_change_functions
;
2056 struct gcpro gcpro1
, gcpro2
;
2057 struct buffer
*old
= current_buffer
;
2063 /* "Bind" before-change-functions and after-change-functions
2064 to nil--but in a way that errors don't know about.
2065 That way, if there's an error in them, they will stay nil. */
2066 before_change_functions
= Vbefore_change_functions
;
2067 after_change_functions
= Vafter_change_functions
;
2068 Vbefore_change_functions
= Qnil
;
2069 Vafter_change_functions
= Qnil
;
2070 GCPRO2 (before_change_functions
, after_change_functions
);
2072 /* Actually run the hook functions. */
2073 args
[0] = Qbefore_change_functions
;
2074 args
[1] = FETCH_START
;
2075 args
[2] = FETCH_END
;
2076 run_hook_list_with_args (before_change_functions
, 3, args
);
2078 /* "Unbind" the variables we "bound" to nil. Beware a
2079 buffer-local hook which changes the buffer when run (e.g. W3). */
2080 if (old
!= current_buffer
)
2082 new = current_buffer
;
2083 set_buffer_internal (old
);
2084 Vbefore_change_functions
= before_change_functions
;
2085 Vafter_change_functions
= after_change_functions
;
2086 set_buffer_internal (new);
2090 Vbefore_change_functions
= before_change_functions
;
2091 Vafter_change_functions
= after_change_functions
;
2096 if (!NILP (current_buffer
->overlays_before
)
2097 || !NILP (current_buffer
->overlays_after
))
2100 report_overlay_modification (FETCH_START
, FETCH_END
, 0,
2101 FETCH_START
, FETCH_END
, Qnil
);
2104 if (! NILP (start_marker
))
2105 free_marker (start_marker
);
2106 if (! NILP (end_marker
))
2107 free_marker (end_marker
);
2112 /* Signal a change immediately after it happens.
2113 CHARPOS is the character position of the start of the changed text.
2114 LENDEL is the number of characters of the text before the change.
2115 (Not the whole buffer; just the part that was changed.)
2116 LENINS is the number of characters in that part of the text
2117 after the change. */
2120 signal_after_change (charpos
, lendel
, lenins
)
2121 int charpos
, lendel
, lenins
;
2123 if (inhibit_modification_hooks
)
2126 /* If we are deferring calls to the after-change functions
2127 and there are no before-change functions,
2128 just record the args that we were going to use. */
2129 if (! NILP (Vcombine_after_change_calls
)
2130 && NILP (Vbefore_change_functions
)
2131 && NILP (current_buffer
->overlays_before
)
2132 && NILP (current_buffer
->overlays_after
))
2136 if (!NILP (combine_after_change_list
)
2137 && current_buffer
!= XBUFFER (combine_after_change_buffer
))
2138 Fcombine_after_change_execute ();
2140 elt
= Fcons (make_number (charpos
- BEG
),
2141 Fcons (make_number (Z
- (charpos
- lendel
+ lenins
)),
2142 Fcons (make_number (lenins
- lendel
), Qnil
)));
2143 combine_after_change_list
2144 = Fcons (elt
, combine_after_change_list
);
2145 combine_after_change_buffer
= Fcurrent_buffer ();
2150 if (!NILP (combine_after_change_list
))
2151 Fcombine_after_change_execute ();
2153 if (!NILP (Vafter_change_functions
))
2155 Lisp_Object args
[4];
2156 Lisp_Object before_change_functions
;
2157 Lisp_Object after_change_functions
;
2158 struct buffer
*old
= current_buffer
;
2160 struct gcpro gcpro1
, gcpro2
;
2162 /* "Bind" before-change-functions and after-change-functions
2163 to nil--but in a way that errors don't know about.
2164 That way, if there's an error in them, they will stay nil. */
2165 before_change_functions
= Vbefore_change_functions
;
2166 after_change_functions
= Vafter_change_functions
;
2167 Vbefore_change_functions
= Qnil
;
2168 Vafter_change_functions
= Qnil
;
2169 GCPRO2 (before_change_functions
, after_change_functions
);
2171 /* Actually run the hook functions. */
2172 args
[0] = Qafter_change_functions
;
2173 XSETFASTINT (args
[1], charpos
);
2174 XSETFASTINT (args
[2], charpos
+ lenins
);
2175 XSETFASTINT (args
[3], lendel
);
2176 run_hook_list_with_args (after_change_functions
,
2179 /* "Unbind" the variables we "bound" to nil. Beware a
2180 buffer-local hook which changes the buffer when run (e.g. W3). */
2181 if (old
!= current_buffer
)
2183 new = current_buffer
;
2184 set_buffer_internal (old
);
2185 Vbefore_change_functions
= before_change_functions
;
2186 Vafter_change_functions
= after_change_functions
;
2187 set_buffer_internal (new);
2191 Vbefore_change_functions
= before_change_functions
;
2192 Vafter_change_functions
= after_change_functions
;
2197 if (!NILP (current_buffer
->overlays_before
)
2198 || !NILP (current_buffer
->overlays_after
))
2199 report_overlay_modification (make_number (charpos
),
2200 make_number (charpos
+ lenins
),
2202 make_number (charpos
),
2203 make_number (charpos
+ lenins
),
2204 make_number (lendel
));
2206 /* After an insertion, call the text properties
2207 insert-behind-hooks or insert-in-front-hooks. */
2209 report_interval_modification (make_number (charpos
),
2210 make_number (charpos
+ lenins
));
2214 Fcombine_after_change_execute_1 (val
)
2217 Vcombine_after_change_calls
= val
;
2221 DEFUN ("combine-after-change-execute", Fcombine_after_change_execute
,
2222 Scombine_after_change_execute
, 0, 0, 0,
2223 doc
: /* This function is for use internally in `combine-after-change-calls'. */)
2226 int count
= specpdl_ptr
- specpdl
;
2227 int beg
, end
, change
;
2231 if (NILP (combine_after_change_list
))
2234 record_unwind_protect (Fset_buffer
, Fcurrent_buffer ());
2236 Fset_buffer (combine_after_change_buffer
);
2238 /* # chars unchanged at beginning of buffer. */
2240 /* # chars unchanged at end of buffer. */
2242 /* Total amount of insertion (negative for deletion). */
2245 /* Scan the various individual changes,
2246 accumulating the range info in BEG, END and CHANGE. */
2247 for (tail
= combine_after_change_list
; CONSP (tail
);
2251 int thisbeg
, thisend
, thischange
;
2253 /* Extract the info from the next element. */
2257 thisbeg
= XINT (XCAR (elt
));
2262 thisend
= XINT (XCAR (elt
));
2267 thischange
= XINT (XCAR (elt
));
2269 /* Merge this range into the accumulated range. */
2270 change
+= thischange
;
2277 /* Get the current start and end positions of the range
2278 that was changed. */
2282 /* We are about to handle these, so discard them. */
2283 combine_after_change_list
= Qnil
;
2285 /* Now run the after-change functions for real.
2286 Turn off the flag that defers them. */
2287 record_unwind_protect (Fcombine_after_change_execute_1
,
2288 Vcombine_after_change_calls
);
2289 signal_after_change (begpos
, endpos
- begpos
- change
, endpos
- begpos
);
2290 update_compositions (begpos
, endpos
, CHECK_ALL
);
2292 return unbind_to (count
, Qnil
);
2298 staticpro (&combine_after_change_list
);
2299 combine_after_change_list
= Qnil
;
2300 combine_after_change_buffer
= Qnil
;
2302 DEFVAR_BOOL ("check-markers-debug-flag", &check_markers_debug_flag
,
2303 doc
: /* Non-nil means enable debugging checks for invalid marker positions. */);
2304 check_markers_debug_flag
= 0;
2305 DEFVAR_LISP ("combine-after-change-calls", &Vcombine_after_change_calls
,
2306 doc
: /* Used internally by the `combine-after-change-calls' macro. */);
2307 Vcombine_after_change_calls
= Qnil
;
2309 DEFVAR_BOOL ("inhibit-modification-hooks", &inhibit_modification_hooks
,
2310 doc
: /* Non-nil means don't run any of the hooks that respond to buffer changes.
2311 This affects `before-change-functions' and `after-change-functions',
2312 as well as hooks attached to text properties and overlays. */);
2313 inhibit_modification_hooks
= 0;
2314 Qinhibit_modification_hooks
= intern ("inhibit-modification-hooks");
2315 staticpro (&Qinhibit_modification_hooks
);
2317 defsubr (&Scombine_after_change_execute
);