1 /* Buffer insertion/deletion and gap motion for GNU Emacs.
2 Copyright (C) 1985, 86,93,94,95,97,98, 1999, 2000, 01, 2003
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 struct Lisp_Marker
*tail
;
83 int multibyte
= ! NILP (current_buffer
->enable_multibyte_characters
);
85 for (tail
= BUF_MARKERS (current_buffer
); tail
; tail
= tail
->next
)
87 if (tail
->buffer
->text
!= current_buffer
->text
)
89 if (tail
->charpos
> Z
)
91 if (tail
->bytepos
> Z_BYTE
)
93 if (multibyte
&& ! CHAR_HEAD_P (FETCH_BYTE (tail
->bytepos
)))
98 /* Move gap to position CHARPOS.
99 Note that this can quit! */
105 move_gap_both (charpos
, charpos_to_bytepos (charpos
));
108 /* Move gap to byte position BYTEPOS, which is also char position CHARPOS.
109 Note that this can quit! */
112 move_gap_both (charpos
, bytepos
)
113 int charpos
, bytepos
;
115 if (bytepos
< GPT_BYTE
)
116 gap_left (charpos
, bytepos
, 0);
117 else if (bytepos
> GPT_BYTE
)
118 gap_right (charpos
, bytepos
);
121 /* Move the gap to a position less than the current GPT.
122 BYTEPOS describes the new position as a byte position,
123 and CHARPOS is the corresponding char position.
124 If NEWGAP is nonzero, then don't update beg_unchanged and end_unchanged. */
127 gap_left (charpos
, bytepos
, newgap
)
128 register int charpos
, bytepos
;
131 register unsigned char *to
, *from
;
136 BUF_COMPUTE_UNCHANGED (current_buffer
, charpos
, GPT
);
143 /* Now copy the characters. To move the gap down,
144 copy characters up. */
148 /* I gets number of characters left to copy. */
149 i
= new_s1
- bytepos
;
152 /* If a quit is requested, stop copying now.
153 Change BYTEPOS to be where we have actually moved the gap to. */
157 charpos
= BYTE_TO_CHAR (bytepos
);
160 /* Move at most 32000 chars before checking again for a quit. */
165 /* bcopy is safe if the two areas of memory do not overlap
166 or on systems where bcopy is always safe for moving upward. */
167 && (BCOPY_UPWARD_SAFE
168 || to
- from
>= 128))
170 /* If overlap is not safe, avoid it by not moving too many
171 characters at once. */
172 if (!BCOPY_UPWARD_SAFE
&& i
> to
- from
)
187 /* Adjust markers, and buffer data structure, to put the gap at BYTEPOS.
188 BYTEPOS is where the loop above stopped, which may be what was specified
189 or may be where a quit was detected. */
190 adjust_markers_gap_motion (bytepos
, GPT_BYTE
, GAP_SIZE
);
193 if (bytepos
< charpos
)
195 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
199 /* Move the gap to a position greater than than the current GPT.
200 BYTEPOS describes the new position as a byte position,
201 and CHARPOS is the corresponding char position. */
204 gap_right (charpos
, bytepos
)
205 register int charpos
, bytepos
;
207 register unsigned char *to
, *from
;
211 BUF_COMPUTE_UNCHANGED (current_buffer
, charpos
, GPT
);
218 /* Now copy the characters. To move the gap up,
219 copy characters down. */
223 /* I gets number of characters left to copy. */
224 i
= bytepos
- new_s1
;
227 /* If a quit is requested, stop copying now.
228 Change BYTEPOS to be where we have actually moved the gap to. */
232 charpos
= BYTE_TO_CHAR (bytepos
);
235 /* Move at most 32000 chars before checking again for a quit. */
240 /* bcopy is safe if the two areas of memory do not overlap
241 or on systems where bcopy is always safe for moving downward. */
242 && (BCOPY_DOWNWARD_SAFE
243 || from
- to
>= 128))
245 /* If overlap is not safe, avoid it by not moving too many
246 characters at once. */
247 if (!BCOPY_DOWNWARD_SAFE
&& i
> from
- to
)
262 adjust_markers_gap_motion (GPT_BYTE
+ GAP_SIZE
, bytepos
+ GAP_SIZE
,
266 if (bytepos
< charpos
)
268 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
272 /* Add AMOUNT to the byte position of every marker in the current buffer
273 whose current byte position is between FROM (exclusive) and TO (inclusive).
275 Also, any markers past the outside of that interval, in the direction
276 of adjustment, are first moved back to the near end of the interval
277 and then adjusted by AMOUNT.
279 When the latter adjustment is done, if AMOUNT is negative,
280 we record the adjustment for undo. (This case happens only for
283 The markers' character positions are not altered,
284 because gap motion does not affect character positions. */
286 int adjust_markers_test
;
289 adjust_markers_gap_motion (from
, to
, amount
)
290 register int from
, to
, amount
;
292 /* Now that a marker has a bytepos, not counting the gap,
293 nothing needs to be done here. */
296 register struct Lisp_Marker
*m
;
299 marker
= BUF_MARKERS (current_buffer
);
301 while (!NILP (marker
))
303 m
= XMARKER (marker
);
307 if (mpos
> to
&& mpos
< to
+ amount
)
309 if (adjust_markers_test
)
316 /* Here's the case where a marker is inside text being deleted.
317 AMOUNT can be negative for gap motion, too,
318 but then this range contains no markers. */
319 if (mpos
> from
+ amount
&& mpos
<= from
)
321 if (adjust_markers_test
)
323 mpos
= from
+ amount
;
326 if (mpos
> from
&& mpos
<= to
)
334 /* Adjust all markers for a deletion
335 whose range in bytes is FROM_BYTE to TO_BYTE.
336 The range in charpos is FROM to TO.
338 This function assumes that the gap is adjacent to
339 or inside of the range being deleted. */
342 adjust_markers_for_delete (from
, from_byte
, to
, to_byte
)
343 register int from
, from_byte
, to
, to_byte
;
346 register struct Lisp_Marker
*m
;
347 register int charpos
;
349 for (m
= BUF_MARKERS (current_buffer
); m
; m
= m
->next
)
351 charpos
= m
->charpos
;
356 /* If the marker is after the deletion,
357 relocate by number of chars / bytes deleted. */
360 m
->charpos
-= to
- from
;
361 m
->bytepos
-= to_byte
- from_byte
;
363 /* Here's the case where a marker is inside text being deleted. */
364 else if (charpos
> from
)
366 if (! m
->insertion_type
)
367 { /* Normal markers will end up at the beginning of the
368 re-inserted text after undoing a deletion, and must be
369 adjusted to move them to the correct place. */
370 XSETMISC (marker
, m
);
371 record_marker_adjustment (marker
, from
- charpos
);
373 else if (charpos
< to
)
374 { /* Before-insertion markers will automatically move forward
375 upon re-inserting the deleted text, so we have to arrange
376 for them to move backward to the correct position. */
377 XSETMISC (marker
, m
);
378 record_marker_adjustment (marker
, charpos
- to
);
381 m
->bytepos
= from_byte
;
383 /* Here's the case where a before-insertion marker is immediately
384 before the deleted region. */
385 else if (charpos
== from
&& m
->insertion_type
)
387 /* Undoing the change uses normal insertion, which will
388 incorrectly make MARKER move forward, so we arrange for it
389 to then move backward to the correct place at the beginning
390 of the deleted region. */
391 XSETMISC (marker
, m
);
392 record_marker_adjustment (marker
, to
- from
);
398 /* Adjust markers for an insertion that stretches from FROM / FROM_BYTE
399 to TO / TO_BYTE. We have to relocate the charpos of every marker
400 that points after the insertion (but not their bytepos).
402 When a marker points at the insertion point,
403 we advance it if either its insertion-type is t
404 or BEFORE_MARKERS is true. */
407 adjust_markers_for_insert (from
, from_byte
, to
, to_byte
, before_markers
)
408 register int from
, from_byte
, to
, to_byte
;
411 struct Lisp_Marker
*m
;
413 int nchars
= to
- from
;
414 int nbytes
= to_byte
- from_byte
;
416 for (m
= BUF_MARKERS (current_buffer
); m
; m
= m
->next
)
418 /* In a single-byte buffer, a marker's two positions must be
422 if (m
->charpos
!= m
->bytepos
)
426 if (m
->bytepos
== from_byte
)
428 if (m
->insertion_type
|| before_markers
)
430 m
->bytepos
= to_byte
;
432 if (m
->insertion_type
)
436 else if (m
->bytepos
> from_byte
)
438 m
->bytepos
+= nbytes
;
439 m
->charpos
+= nchars
;
443 /* Adjusting only markers whose insertion-type is t may result in
444 - disordered start and end in overlays, and
445 - disordered overlays in the slot `overlays_before' of current_buffer. */
448 fix_start_end_in_overlays(from
, to
);
449 fix_overlays_before (current_buffer
, from
, to
);
453 /* Adjust point for an insertion of NBYTES bytes, which are NCHARS characters.
455 This is used only when the value of point changes due to an insert
456 or delete; it does not represent a conceptual change in point as a
457 marker. In particular, point is not crossing any interval
458 boundaries, so there's no need to use the usual SET_PT macro. In
459 fact it would be incorrect to do so, because either the old or the
460 new value of point is out of sync with the current set of
464 adjust_point (nchars
, nbytes
)
467 BUF_PT (current_buffer
) += nchars
;
468 BUF_PT_BYTE (current_buffer
) += nbytes
;
470 /* In a single-byte buffer, the two positions must be equal. */
476 /* Adjust markers for a replacement of a text at FROM (FROM_BYTE) of
477 length OLD_CHARS (OLD_BYTES) to a new text of length NEW_CHARS
478 (NEW_BYTES). It is assumed that OLD_CHARS > 0, i.e., this is not
482 adjust_markers_for_replace (from
, from_byte
, old_chars
, old_bytes
,
483 new_chars
, new_bytes
)
484 int from
, from_byte
, old_chars
, old_bytes
, new_chars
, new_bytes
;
486 register struct Lisp_Marker
*m
;
487 int prev_to_byte
= from_byte
+ old_bytes
;
488 int diff_chars
= new_chars
- old_chars
;
489 int diff_bytes
= new_bytes
- old_bytes
;
491 for (m
= BUF_MARKERS (current_buffer
); m
; m
= m
->next
)
493 if (m
->bytepos
>= prev_to_byte
)
495 m
->charpos
+= diff_chars
;
496 m
->bytepos
+= diff_bytes
;
498 else if (m
->bytepos
> from_byte
)
501 m
->bytepos
= from_byte
;
509 /* Make the gap NBYTES_ADDED bytes longer. */
512 make_gap_larger (nbytes_added
)
517 int real_gap_loc_byte
;
520 /* If we have to get more space, get enough to last a while. */
521 nbytes_added
+= 2000;
523 /* Don't allow a buffer size that won't fit in an int
524 even if it will fit in a Lisp integer.
525 That won't work because so many places use `int'.
527 Make sure we don't introduce overflows in the calculation. */
529 if (Z_BYTE
- BEG_BYTE
+ GAP_SIZE
530 >= (((EMACS_INT
) 1 << (min (VALBITS
, BITS_PER_INT
) - 1)) - 1
532 error ("Buffer exceeds maximum size");
534 enlarge_buffer_text (current_buffer
, nbytes_added
);
536 /* Prevent quitting in move_gap. */
541 real_gap_loc_byte
= GPT_BYTE
;
542 old_gap_size
= GAP_SIZE
;
544 /* Call the newly allocated space a gap at the end of the whole space. */
546 GPT_BYTE
= Z_BYTE
+ GAP_SIZE
;
547 GAP_SIZE
= nbytes_added
;
549 /* Move the new gap down to be consecutive with the end of the old one.
550 This adjusts the markers properly too. */
551 gap_left (real_gap_loc
+ old_gap_size
, real_gap_loc_byte
+ old_gap_size
, 1);
553 /* Now combine the two into one large gap. */
554 GAP_SIZE
+= old_gap_size
;
556 GPT_BYTE
= real_gap_loc_byte
;
565 /* Make the gap NBYTES_REMOVED bytes shorter. */
568 make_gap_smaller (nbytes_removed
)
573 int real_gap_loc_byte
;
576 int real_beg_unchanged
;
579 /* Make sure the gap is at least 20 bytes. */
580 if (GAP_SIZE
- nbytes_removed
< 20)
581 nbytes_removed
= GAP_SIZE
- 20;
583 /* Prevent quitting in move_gap. */
588 real_gap_loc_byte
= GPT_BYTE
;
589 new_gap_size
= GAP_SIZE
- nbytes_removed
;
591 real_Z_byte
= Z_BYTE
;
592 real_beg_unchanged
= BEG_UNCHANGED
;
594 /* Pretend that the last unwanted part of the gap is the entire gap,
595 and that the first desired part of the gap is part of the buffer
597 bzero (GPT_ADDR
, new_gap_size
);
599 GPT_BYTE
+= new_gap_size
;
601 Z_BYTE
+= new_gap_size
;
602 GAP_SIZE
= nbytes_removed
;
604 /* Move the unwanted pretend gap to the end of the buffer. This
605 adjusts the markers properly too. */
606 gap_right (Z
, Z_BYTE
);
608 enlarge_buffer_text (current_buffer
, -nbytes_removed
);
610 /* Now restore the desired gap. */
611 GAP_SIZE
= new_gap_size
;
613 GPT_BYTE
= real_gap_loc_byte
;
615 Z_BYTE
= real_Z_byte
;
616 BEG_UNCHANGED
= real_beg_unchanged
;
625 make_gap (nbytes_added
)
628 if (nbytes_added
>= 0)
629 make_gap_larger (nbytes_added
);
630 #if defined USE_MMAP_FOR_BUFFERS || defined REL_ALLOC || defined DOUG_LEA_MALLOC
632 make_gap_smaller (-nbytes_added
);
636 /* Copy NBYTES bytes of text from FROM_ADDR to TO_ADDR.
637 FROM_MULTIBYTE says whether the incoming text is multibyte.
638 TO_MULTIBYTE says whether to store the text as multibyte.
639 If FROM_MULTIBYTE != TO_MULTIBYTE, we convert.
641 Return the number of bytes stored at TO_ADDR. */
644 copy_text (from_addr
, to_addr
, nbytes
,
645 from_multibyte
, to_multibyte
)
646 const unsigned char *from_addr
;
647 unsigned char *to_addr
;
649 int from_multibyte
, to_multibyte
;
651 if (from_multibyte
== to_multibyte
)
653 bcopy (from_addr
, to_addr
, nbytes
);
656 else if (from_multibyte
)
659 int bytes_left
= nbytes
;
660 Lisp_Object tbl
= Qnil
;
662 while (bytes_left
> 0)
665 c
= STRING_CHAR_AND_LENGTH (from_addr
, bytes_left
, thislen
);
666 if (!ASCII_CHAR_P (c
))
667 c
= multibyte_char_to_unibyte (c
, tbl
);
669 from_addr
+= thislen
;
670 bytes_left
-= thislen
;
677 unsigned char *initial_to_addr
= to_addr
;
679 /* Convert single-byte to multibyte. */
682 int c
= *from_addr
++;
686 c
= unibyte_char_to_multibyte (c
);
687 to_addr
+= CHAR_STRING (c
, to_addr
);
691 /* Special case for speed. */
692 *to_addr
++ = c
, nbytes
--;
694 return to_addr
- initial_to_addr
;
698 /* Return the number of bytes it would take
699 to convert some single-byte text to multibyte.
700 The single-byte text consists of NBYTES bytes at PTR. */
703 count_size_as_multibyte (ptr
, nbytes
)
704 const unsigned char *ptr
;
708 int outgoing_nbytes
= 0;
710 for (i
= 0; i
< nbytes
; i
++)
712 unsigned int c
= *ptr
++;
718 c
= unibyte_char_to_multibyte (c
);
719 outgoing_nbytes
+= CHAR_BYTES (c
);
723 return outgoing_nbytes
;
726 /* Insert a string of specified length before point.
727 This function judges multibyteness based on
728 enable_multibyte_characters in the current buffer;
729 it never converts between single-byte and multibyte.
731 DO NOT use this for the contents of a Lisp string or a Lisp buffer!
732 prepare_to_modify_buffer could relocate the text. */
735 insert (string
, nbytes
)
736 register const unsigned char *string
;
742 insert_1 (string
, nbytes
, 0, 1, 0);
743 signal_after_change (opoint
, 0, PT
- opoint
);
744 update_compositions (opoint
, PT
, CHECK_BORDER
);
748 /* Likewise, but inherit text properties from neighboring characters. */
751 insert_and_inherit (string
, nbytes
)
752 register const unsigned char *string
;
758 insert_1 (string
, nbytes
, 1, 1, 0);
759 signal_after_change (opoint
, 0, PT
- opoint
);
760 update_compositions (opoint
, PT
, CHECK_BORDER
);
764 /* Insert the character C before point. Do not inherit text properties. */
770 unsigned char str
[MAX_MULTIBYTE_LENGTH
];
773 if (! NILP (current_buffer
->enable_multibyte_characters
))
774 len
= CHAR_STRING (c
, str
);
784 /* Insert the null-terminated string S before point. */
790 insert (s
, strlen (s
));
793 /* Like `insert' except that all markers pointing at the place where
794 the insertion happens are adjusted to point after it.
795 Don't use this function to insert part of a Lisp string,
796 since gc could happen and relocate it. */
799 insert_before_markers (string
, nbytes
)
800 const unsigned char *string
;
807 insert_1 (string
, nbytes
, 0, 1, 1);
808 signal_after_change (opoint
, 0, PT
- opoint
);
809 update_compositions (opoint
, PT
, CHECK_BORDER
);
813 /* Likewise, but inherit text properties from neighboring characters. */
816 insert_before_markers_and_inherit (string
, nbytes
)
817 const unsigned char *string
;
824 insert_1 (string
, nbytes
, 1, 1, 1);
825 signal_after_change (opoint
, 0, PT
- opoint
);
826 update_compositions (opoint
, PT
, CHECK_BORDER
);
830 /* Subroutine used by the insert functions above. */
833 insert_1 (string
, nbytes
, inherit
, prepare
, before_markers
)
834 register const unsigned char *string
;
836 int inherit
, prepare
, before_markers
;
838 insert_1_both (string
, chars_in_text (string
, nbytes
), nbytes
,
839 inherit
, prepare
, before_markers
);
843 #ifdef BYTE_COMBINING_DEBUG
845 /* See if the bytes before POS/POS_BYTE combine with bytes
846 at the start of STRING to form a single character.
847 If so, return the number of bytes at the start of STRING
848 which combine in this way. Otherwise, return 0. */
851 count_combining_before (string
, length
, pos
, pos_byte
)
852 const unsigned char *string
;
856 int len
, combining_bytes
;
857 const unsigned char *p
;
859 if (NILP (current_buffer
->enable_multibyte_characters
))
862 /* At first, we can exclude the following cases:
863 (1) STRING[0] can't be a following byte of multibyte sequence.
864 (2) POS is the start of the current buffer.
865 (3) A character before POS is not a multibyte character. */
866 if (length
== 0 || CHAR_HEAD_P (*string
)) /* case (1) */
868 if (pos_byte
== BEG_BYTE
) /* case (2) */
871 p
= BYTE_POS_ADDR (pos_byte
- 1);
872 while (! CHAR_HEAD_P (*p
)) p
--, len
++;
873 if (! BASE_LEADING_CODE_P (*p
)) /* case (3) */
876 combining_bytes
= BYTES_BY_CHAR_HEAD (*p
) - len
;
877 if (combining_bytes
<= 0)
878 /* The character preceding POS is, complete and no room for
879 combining bytes (combining_bytes == 0), or an independent 8-bit
880 character (combining_bytes < 0). */
883 /* We have a combination situation. Count the bytes at STRING that
886 while (!CHAR_HEAD_P (*p
) && p
< string
+ length
)
889 return (combining_bytes
< p
- string
? combining_bytes
: p
- string
);
892 /* See if the bytes after POS/POS_BYTE combine with bytes
893 at the end of STRING to form a single character.
894 If so, return the number of bytes after POS/POS_BYTE
895 which combine in this way. Otherwise, return 0. */
898 count_combining_after (string
, length
, pos
, pos_byte
)
899 const unsigned char *string
;
903 int opos_byte
= pos_byte
;
908 if (NILP (current_buffer
->enable_multibyte_characters
))
911 /* At first, we can exclude the following cases:
912 (1) The last byte of STRING is an ASCII.
913 (2) POS is the last of the current buffer.
914 (3) A character at POS can't be a following byte of multibyte
916 if (length
> 0 && ASCII_BYTE_P (string
[length
- 1])) /* case (1) */
918 if (pos_byte
== Z_BYTE
) /* case (2) */
920 bufp
= BYTE_POS_ADDR (pos_byte
);
921 if (CHAR_HEAD_P (*bufp
)) /* case (3) */
925 while (i
>= 0 && ! CHAR_HEAD_P (string
[i
]))
931 /* All characters in STRING are not character head. We must
932 check also preceding bytes at POS. We are sure that the gap
934 unsigned char *p
= BEG_ADDR
;
936 while (i
>= 0 && ! CHAR_HEAD_P (p
[i
]))
938 if (i
< 0 || !BASE_LEADING_CODE_P (p
[i
]))
941 bytes
= BYTES_BY_CHAR_HEAD (p
[i
]);
942 return (bytes
<= pos_byte
- 1 - i
+ length
944 : bytes
- (pos_byte
- 1 - i
+ length
));
946 if (!BASE_LEADING_CODE_P (string
[i
]))
949 bytes
= BYTES_BY_CHAR_HEAD (string
[i
]) - (length
- i
);
951 while (!CHAR_HEAD_P (*bufp
)) bufp
++, pos_byte
++;
953 return (bytes
<= pos_byte
- opos_byte
? bytes
: pos_byte
- opos_byte
);
959 /* Insert a sequence of NCHARS chars which occupy NBYTES bytes
960 starting at STRING. INHERIT, PREPARE and BEFORE_MARKERS
961 are the same as in insert_1. */
964 insert_1_both (string
, nchars
, nbytes
, inherit
, prepare
, before_markers
)
965 register const unsigned char *string
;
966 register int nchars
, nbytes
;
967 int inherit
, prepare
, before_markers
;
972 if (NILP (current_buffer
->enable_multibyte_characters
))
976 /* Do this before moving and increasing the gap,
977 because the before-change hooks might move the gap
978 or make it smaller. */
979 prepare_to_modify_buffer (PT
, PT
, NULL
);
982 move_gap_both (PT
, PT_BYTE
);
983 if (GAP_SIZE
< nbytes
)
984 make_gap (nbytes
- GAP_SIZE
);
986 #ifdef BYTE_COMBINING_DEBUG
987 if (count_combining_before (string
, nbytes
, PT
, PT_BYTE
)
988 || count_combining_after (string
, nbytes
, PT
, PT_BYTE
))
992 /* Record deletion of the surrounding text that combines with
993 the insertion. This, together with recording the insertion,
994 will add up to the right stuff in the undo list. */
995 record_insert (PT
, nchars
);
998 bcopy (string
, GPT_ADDR
, nbytes
);
1007 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1012 /* The insert may have been in the unchanged region, so check again. */
1013 if (Z
- GPT
< END_UNCHANGED
)
1014 END_UNCHANGED
= Z
- GPT
;
1016 adjust_overlays_for_insert (PT
, nchars
);
1017 adjust_markers_for_insert (PT
, PT_BYTE
,
1018 PT
+ nchars
, PT_BYTE
+ nbytes
,
1021 if (BUF_INTERVALS (current_buffer
) != 0)
1022 offset_intervals (current_buffer
, PT
, nchars
);
1024 if (!inherit
&& BUF_INTERVALS (current_buffer
) != 0)
1025 set_text_properties (make_number (PT
), make_number (PT
+ nchars
),
1028 adjust_point (nchars
, nbytes
);
1033 /* Insert the part of the text of STRING, a Lisp object assumed to be
1034 of type string, consisting of the LENGTH characters (LENGTH_BYTE bytes)
1035 starting at position POS / POS_BYTE. If the text of STRING has properties,
1036 copy them into the buffer.
1038 It does not work to use `insert' for this, because a GC could happen
1039 before we bcopy the stuff into the buffer, and relocate the string
1040 without insert noticing. */
1043 insert_from_string (string
, pos
, pos_byte
, length
, length_byte
, inherit
)
1045 register int pos
, pos_byte
, length
, length_byte
;
1049 insert_from_string_1 (string
, pos
, pos_byte
, length
, length_byte
,
1051 signal_after_change (opoint
, 0, PT
- opoint
);
1052 update_compositions (opoint
, PT
, CHECK_BORDER
);
1055 /* Like `insert_from_string' except that all markers pointing
1056 at the place where the insertion happens are adjusted to point after it. */
1059 insert_from_string_before_markers (string
, pos
, pos_byte
,
1060 length
, length_byte
, inherit
)
1062 register int pos
, pos_byte
, length
, length_byte
;
1066 insert_from_string_1 (string
, pos
, pos_byte
, length
, length_byte
,
1068 signal_after_change (opoint
, 0, PT
- opoint
);
1069 update_compositions (opoint
, PT
, CHECK_BORDER
);
1072 /* Subroutine of the insertion functions above. */
1075 insert_from_string_1 (string
, pos
, pos_byte
, nchars
, nbytes
,
1076 inherit
, before_markers
)
1078 register int pos
, pos_byte
, nchars
, nbytes
;
1079 int inherit
, before_markers
;
1081 struct gcpro gcpro1
;
1082 int outgoing_nbytes
= nbytes
;
1085 /* Make OUTGOING_NBYTES describe the text
1086 as it will be inserted in this buffer. */
1088 if (NILP (current_buffer
->enable_multibyte_characters
))
1089 outgoing_nbytes
= nchars
;
1090 else if (! STRING_MULTIBYTE (string
))
1092 = count_size_as_multibyte (SDATA (string
) + pos_byte
,
1096 /* Do this before moving and increasing the gap,
1097 because the before-change hooks might move the gap
1098 or make it smaller. */
1099 prepare_to_modify_buffer (PT
, PT
, NULL
);
1102 move_gap_both (PT
, PT_BYTE
);
1103 if (GAP_SIZE
< outgoing_nbytes
)
1104 make_gap (outgoing_nbytes
- GAP_SIZE
);
1107 /* Copy the string text into the buffer, perhaps converting
1108 between single-byte and multibyte. */
1109 copy_text (SDATA (string
) + pos_byte
, GPT_ADDR
, nbytes
,
1110 STRING_MULTIBYTE (string
),
1111 ! NILP (current_buffer
->enable_multibyte_characters
));
1113 #ifdef BYTE_COMBINING_DEBUG
1114 /* We have copied text into the gap, but we have not altered
1115 PT or PT_BYTE yet. So we can pass PT and PT_BYTE
1116 to these functions and get the same results as we would
1117 have got earlier on. Meanwhile, PT_ADDR does point to
1118 the text that has been stored by copy_text. */
1119 if (count_combining_before (GPT_ADDR
, outgoing_nbytes
, PT
, PT_BYTE
)
1120 || count_combining_after (GPT_ADDR
, outgoing_nbytes
, PT
, PT_BYTE
))
1124 record_insert (PT
, nchars
);
1127 GAP_SIZE
-= outgoing_nbytes
;
1131 GPT_BYTE
+= outgoing_nbytes
;
1132 ZV_BYTE
+= outgoing_nbytes
;
1133 Z_BYTE
+= outgoing_nbytes
;
1134 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1139 /* The insert may have been in the unchanged region, so check again. */
1140 if (Z
- GPT
< END_UNCHANGED
)
1141 END_UNCHANGED
= Z
- GPT
;
1143 adjust_overlays_for_insert (PT
, nchars
);
1144 adjust_markers_for_insert (PT
, PT_BYTE
, PT
+ nchars
,
1145 PT_BYTE
+ outgoing_nbytes
,
1148 offset_intervals (current_buffer
, PT
, nchars
);
1150 intervals
= STRING_INTERVALS (string
);
1151 /* Get the intervals for the part of the string we are inserting. */
1152 if (nbytes
< SBYTES (string
))
1153 intervals
= copy_intervals (intervals
, pos
, nchars
);
1155 /* Insert those intervals. */
1156 graft_intervals_into_buffer (intervals
, PT
, nchars
,
1157 current_buffer
, inherit
);
1159 adjust_point (nchars
, outgoing_nbytes
);
1164 /* Insert a sequence of NCHARS chars which occupy NBYTES bytes
1165 starting at GPT_ADDR. */
1168 insert_from_gap (nchars
, nbytes
)
1169 register int nchars
, nbytes
;
1171 if (NILP (current_buffer
->enable_multibyte_characters
))
1174 record_insert (GPT
, nchars
);
1184 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1189 adjust_overlays_for_insert (GPT
- nchars
, nchars
);
1190 adjust_markers_for_insert (GPT
- nchars
, GPT_BYTE
- nbytes
,
1193 if (BUF_INTERVALS (current_buffer
) != 0)
1195 offset_intervals (current_buffer
, GPT
- nchars
, nchars
);
1196 graft_intervals_into_buffer (NULL_INTERVAL
, GPT
- nchars
, nchars
,
1200 if (GPT
- nchars
< PT
)
1201 adjust_point (nchars
, 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 /* The insert may have been in the unchanged region, so check again. */
1335 if (Z
- GPT
< END_UNCHANGED
)
1336 END_UNCHANGED
= Z
- GPT
;
1338 adjust_overlays_for_insert (PT
, nchars
);
1339 adjust_markers_for_insert (PT
, PT_BYTE
, PT
+ nchars
,
1340 PT_BYTE
+ outgoing_nbytes
,
1343 if (BUF_INTERVALS (current_buffer
) != 0)
1344 offset_intervals (current_buffer
, PT
, nchars
);
1346 /* Get the intervals for the part of the string we are inserting. */
1347 intervals
= BUF_INTERVALS (buf
);
1348 if (outgoing_nbytes
< BUF_Z_BYTE (buf
) - BUF_BEG_BYTE (buf
))
1350 if (buf
== current_buffer
&& PT
<= from
)
1352 intervals
= copy_intervals (intervals
, from
, nchars
);
1355 /* Insert those intervals. */
1356 graft_intervals_into_buffer (intervals
, PT
, nchars
, current_buffer
, inherit
);
1358 adjust_point (nchars
, outgoing_nbytes
);
1361 /* Record undo information and adjust markers and position keepers for
1362 a replacement of a text PREV_TEXT at FROM to a new text of LEN
1363 chars (LEN_BYTE bytes) which resides in the gap just after
1366 PREV_TEXT nil means the new text was just inserted. */
1369 adjust_after_replace (from
, from_byte
, prev_text
, len
, len_byte
)
1370 int from
, from_byte
, len
, len_byte
;
1371 Lisp_Object prev_text
;
1373 int nchars_del
= 0, nbytes_del
= 0;
1375 #ifdef BYTE_COMBINING_DEBUG
1376 if (count_combining_before (GPT_ADDR
, len_byte
, from
, from_byte
)
1377 || count_combining_after (GPT_ADDR
, len_byte
, from
, from_byte
))
1381 if (STRINGP (prev_text
))
1383 nchars_del
= SCHARS (prev_text
);
1384 nbytes_del
= SBYTES (prev_text
);
1387 /* Update various buffer positions for the new text. */
1388 GAP_SIZE
-= len_byte
;
1390 ZV_BYTE
+= len_byte
; Z_BYTE
+= len_byte
;
1391 GPT
+= len
; GPT_BYTE
+= len_byte
;
1392 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1395 adjust_markers_for_replace (from
, from_byte
, nchars_del
, nbytes_del
,
1398 adjust_markers_for_insert (from
, from_byte
,
1399 from
+ len
, from_byte
+ len_byte
, 0);
1401 if (! EQ (current_buffer
->undo_list
, Qt
))
1404 record_delete (from
, prev_text
);
1405 record_insert (from
, len
);
1408 if (len
> nchars_del
)
1409 adjust_overlays_for_insert (from
, len
- nchars_del
);
1410 else if (len
< nchars_del
)
1411 adjust_overlays_for_delete (from
, nchars_del
- len
);
1412 if (BUF_INTERVALS (current_buffer
) != 0)
1414 offset_intervals (current_buffer
, from
, len
- nchars_del
);
1418 adjust_point (len
- nchars_del
, len_byte
- nbytes_del
);
1420 /* As byte combining will decrease Z, we must check this again. */
1421 if (Z
- GPT
< END_UNCHANGED
)
1422 END_UNCHANGED
= Z
- GPT
;
1427 evaporate_overlays (from
);
1431 /* Like adjust_after_replace, but doesn't require PREV_TEXT.
1432 This is for use when undo is not enabled in the current buffer. */
1435 adjust_after_replace_noundo (from
, from_byte
, nchars_del
, nbytes_del
, len
, len_byte
)
1436 int from
, from_byte
, nchars_del
, nbytes_del
, len
, len_byte
;
1438 #ifdef BYTE_COMBINING_DEBUG
1439 if (count_combining_before (GPT_ADDR
, len_byte
, from
, from_byte
)
1440 || count_combining_after (GPT_ADDR
, len_byte
, from
, from_byte
))
1444 /* Update various buffer positions for the new text. */
1445 GAP_SIZE
-= len_byte
;
1447 ZV_BYTE
+= len_byte
; Z_BYTE
+= len_byte
;
1448 GPT
+= len
; GPT_BYTE
+= len_byte
;
1449 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1452 adjust_markers_for_replace (from
, from_byte
, nchars_del
, nbytes_del
,
1455 adjust_markers_for_insert (from
, from_byte
,
1456 from
+ len
, from_byte
+ len_byte
, 0);
1458 if (len
> nchars_del
)
1459 adjust_overlays_for_insert (from
, len
- nchars_del
);
1460 else if (len
< nchars_del
)
1461 adjust_overlays_for_delete (from
, nchars_del
- len
);
1462 if (BUF_INTERVALS (current_buffer
) != 0)
1464 offset_intervals (current_buffer
, from
, len
- nchars_del
);
1468 adjust_point (len
- nchars_del
, len_byte
- nbytes_del
);
1470 /* As byte combining will decrease Z, we must check this again. */
1471 if (Z
- GPT
< END_UNCHANGED
)
1472 END_UNCHANGED
= Z
- GPT
;
1477 evaporate_overlays (from
);
1481 /* Record undo information, adjust markers and position keepers for an
1482 insertion of a text from FROM (FROM_BYTE) to TO (TO_BYTE). The
1483 text already exists in the current buffer but character length (TO
1484 - FROM) may be incorrect, the correct length is NEWLEN. */
1487 adjust_after_insert (from
, from_byte
, to
, to_byte
, newlen
)
1488 int from
, from_byte
, to
, to_byte
, newlen
;
1490 int len
= to
- from
, len_byte
= to_byte
- from_byte
;
1493 move_gap_both (to
, to_byte
);
1494 GAP_SIZE
+= len_byte
;
1495 GPT
-= len
; GPT_BYTE
-= len_byte
;
1496 ZV
-= len
; ZV_BYTE
-= len_byte
;
1497 Z
-= len
; Z_BYTE
-= len_byte
;
1498 adjust_after_replace (from
, from_byte
, Qnil
, newlen
, len_byte
);
1501 /* Replace the text from character positions FROM to TO with NEW,
1502 If PREPARE is nonzero, call prepare_to_modify_buffer.
1503 If INHERIT, the newly inserted text should inherit text properties
1504 from the surrounding non-deleted text. */
1506 /* Note that this does not yet handle markers quite right.
1507 Also it needs to record a single undo-entry that does a replacement
1508 rather than a separate delete and insert.
1509 That way, undo will also handle markers properly.
1511 But if MARKERS is 0, don't relocate markers. */
1514 replace_range (from
, to
, new, prepare
, inherit
, markers
)
1516 int from
, to
, prepare
, inherit
, markers
;
1518 int inschars
= SCHARS (new);
1519 int insbytes
= SBYTES (new);
1520 int from_byte
, to_byte
;
1521 int nbytes_del
, nchars_del
;
1522 register Lisp_Object temp
;
1523 struct gcpro gcpro1
;
1525 int outgoing_insbytes
= insbytes
;
1526 Lisp_Object deletion
;
1535 int range_length
= to
- from
;
1536 prepare_to_modify_buffer (from
, to
, &from
);
1537 to
= from
+ range_length
;
1542 /* Make args be valid */
1548 from_byte
= CHAR_TO_BYTE (from
);
1549 to_byte
= CHAR_TO_BYTE (to
);
1551 nchars_del
= to
- from
;
1552 nbytes_del
= to_byte
- from_byte
;
1554 if (nbytes_del
<= 0 && insbytes
== 0)
1557 /* Make OUTGOING_INSBYTES describe the text
1558 as it will be inserted in this buffer. */
1560 if (NILP (current_buffer
->enable_multibyte_characters
))
1561 outgoing_insbytes
= inschars
;
1562 else if (! STRING_MULTIBYTE (new))
1564 = count_size_as_multibyte (SDATA (new), insbytes
);
1566 /* Make sure point-max won't overflow after this insertion. */
1567 XSETINT (temp
, Z_BYTE
- nbytes_del
+ insbytes
);
1568 if (Z_BYTE
- nbytes_del
+ insbytes
!= XINT (temp
))
1569 error ("Maximum buffer size exceeded");
1573 /* Make sure the gap is somewhere in or next to what we are deleting. */
1575 gap_right (from
, from_byte
);
1577 gap_left (to
, to_byte
, 0);
1579 /* Even if we don't record for undo, we must keep the original text
1580 because we may have to recover it because of inappropriate byte
1582 if (! EQ (current_buffer
->undo_list
, Qt
))
1583 deletion
= make_buffer_string_both (from
, from_byte
, to
, to_byte
, 1);
1585 GAP_SIZE
+= nbytes_del
;
1588 ZV_BYTE
-= nbytes_del
;
1589 Z_BYTE
-= nbytes_del
;
1591 GPT_BYTE
= from_byte
;
1592 *(GPT_ADDR
) = 0; /* Put an anchor. */
1597 if (GPT
- BEG
< BEG_UNCHANGED
)
1598 BEG_UNCHANGED
= GPT
- BEG
;
1599 if (Z
- GPT
< END_UNCHANGED
)
1600 END_UNCHANGED
= Z
- GPT
;
1602 if (GAP_SIZE
< insbytes
)
1603 make_gap (insbytes
- GAP_SIZE
);
1605 /* Copy the string text into the buffer, perhaps converting
1606 between single-byte and multibyte. */
1607 copy_text (SDATA (new), GPT_ADDR
, insbytes
,
1608 STRING_MULTIBYTE (new),
1609 ! NILP (current_buffer
->enable_multibyte_characters
));
1611 #ifdef BYTE_COMBINING_DEBUG
1612 /* We have copied text into the gap, but we have not marked
1613 it as part of the buffer. So we can use the old FROM and FROM_BYTE
1614 here, for both the previous text and the following text.
1615 Meanwhile, GPT_ADDR does point to
1616 the text that has been stored by copy_text. */
1617 if (count_combining_before (GPT_ADDR
, outgoing_insbytes
, from
, from_byte
)
1618 || count_combining_after (GPT_ADDR
, outgoing_insbytes
, from
, from_byte
))
1622 if (! EQ (current_buffer
->undo_list
, Qt
))
1624 record_delete (from
, deletion
);
1625 record_insert (from
, inschars
);
1628 GAP_SIZE
-= outgoing_insbytes
;
1632 GPT_BYTE
+= outgoing_insbytes
;
1633 ZV_BYTE
+= outgoing_insbytes
;
1634 Z_BYTE
+= outgoing_insbytes
;
1635 if (GAP_SIZE
> 0) *(GPT_ADDR
) = 0; /* Put an anchor. */
1640 /* Adjust the overlay center as needed. This must be done after
1641 adjusting the markers that bound the overlays. */
1642 adjust_overlays_for_delete (from
, nchars_del
);
1643 adjust_overlays_for_insert (from
, inschars
);
1645 /* Adjust markers for the deletion and the insertion. */
1647 adjust_markers_for_replace (from
, from_byte
, nchars_del
, nbytes_del
,
1648 inschars
, outgoing_insbytes
);
1650 offset_intervals (current_buffer
, from
, inschars
- nchars_del
);
1652 /* Get the intervals for the part of the string we are inserting--
1653 not including the combined-before bytes. */
1654 intervals
= STRING_INTERVALS (new);
1655 /* Insert those intervals. */
1656 graft_intervals_into_buffer (intervals
, from
, inschars
,
1657 current_buffer
, inherit
);
1659 /* Relocate point as if it were a marker. */
1661 adjust_point ((from
+ inschars
- (PT
< to
? PT
: to
)),
1662 (from_byte
+ outgoing_insbytes
1663 - (PT_BYTE
< to_byte
? PT_BYTE
: to_byte
)));
1665 if (outgoing_insbytes
== 0)
1666 evaporate_overlays (from
);
1673 signal_after_change (from
, nchars_del
, GPT
- from
);
1674 update_compositions (from
, GPT
, CHECK_BORDER
);
1677 /* Delete characters in current buffer
1678 from FROM up to (but not including) TO.
1679 If TO comes before FROM, we delete nothing. */
1682 del_range (from
, to
)
1683 register int from
, to
;
1685 del_range_1 (from
, to
, 1, 0);
1688 /* Like del_range; PREPARE says whether to call prepare_to_modify_buffer.
1689 RET_STRING says to return the deleted text. */
1692 del_range_1 (from
, to
, prepare
, ret_string
)
1693 int from
, to
, prepare
, ret_string
;
1695 int from_byte
, to_byte
;
1696 Lisp_Object deletion
;
1697 struct gcpro gcpro1
;
1699 /* Make args be valid */
1710 int range_length
= to
- from
;
1711 prepare_to_modify_buffer (from
, to
, &from
);
1712 to
= min (ZV
, from
+ range_length
);
1715 from_byte
= CHAR_TO_BYTE (from
);
1716 to_byte
= CHAR_TO_BYTE (to
);
1718 deletion
= del_range_2 (from
, from_byte
, to
, to_byte
, ret_string
);
1720 signal_after_change (from
, to
- from
, 0);
1721 update_compositions (from
, from
, CHECK_HEAD
);
1726 /* Like del_range_1 but args are byte positions, not char positions. */
1729 del_range_byte (from_byte
, to_byte
, prepare
)
1730 int from_byte
, to_byte
, prepare
;
1734 /* Make args be valid */
1735 if (from_byte
< BEGV_BYTE
)
1736 from_byte
= BEGV_BYTE
;
1737 if (to_byte
> ZV_BYTE
)
1740 if (to_byte
<= from_byte
)
1743 from
= BYTE_TO_CHAR (from_byte
);
1744 to
= BYTE_TO_CHAR (to_byte
);
1748 int old_from
= from
, old_to
= Z
- to
;
1749 int range_length
= to
- from
;
1750 prepare_to_modify_buffer (from
, to
, &from
);
1751 to
= from
+ range_length
;
1753 if (old_from
!= from
)
1754 from_byte
= CHAR_TO_BYTE (from
);
1760 else if (old_to
== Z
- to
)
1761 to_byte
= CHAR_TO_BYTE (to
);
1764 del_range_2 (from
, from_byte
, to
, to_byte
, 0);
1765 signal_after_change (from
, to
- from
, 0);
1766 update_compositions (from
, from
, CHECK_HEAD
);
1769 /* Like del_range_1, but positions are specified both as charpos
1773 del_range_both (from
, from_byte
, to
, to_byte
, prepare
)
1774 int from
, from_byte
, to
, to_byte
, prepare
;
1776 /* Make args be valid */
1777 if (from_byte
< BEGV_BYTE
)
1778 from_byte
= BEGV_BYTE
;
1779 if (to_byte
> ZV_BYTE
)
1782 if (to_byte
<= from_byte
)
1792 int old_from
= from
, old_to
= Z
- to
;
1793 int range_length
= to
- from
;
1794 prepare_to_modify_buffer (from
, to
, &from
);
1795 to
= from
+ range_length
;
1797 if (old_from
!= from
)
1798 from_byte
= CHAR_TO_BYTE (from
);
1804 else if (old_to
== Z
- to
)
1805 to_byte
= CHAR_TO_BYTE (to
);
1808 del_range_2 (from
, from_byte
, to
, to_byte
, 0);
1809 signal_after_change (from
, to
- from
, 0);
1810 update_compositions (from
, from
, CHECK_HEAD
);
1813 /* Delete a range of text, specified both as character positions
1814 and byte positions. FROM and TO are character positions,
1815 while FROM_BYTE and TO_BYTE are byte positions.
1816 If RET_STRING is true, the deleted area is returned as a string. */
1819 del_range_2 (from
, from_byte
, to
, to_byte
, ret_string
)
1820 int from
, from_byte
, to
, to_byte
, ret_string
;
1822 register int nbytes_del
, nchars_del
;
1823 Lisp_Object deletion
;
1827 nchars_del
= to
- from
;
1828 nbytes_del
= to_byte
- from_byte
;
1830 /* Make sure the gap is somewhere in or next to what we are deleting. */
1832 gap_right (from
, from_byte
);
1834 gap_left (to
, to_byte
, 0);
1836 #ifdef BYTE_COMBINING_DEBUG
1837 if (count_combining_before (BUF_BYTE_ADDRESS (current_buffer
, to_byte
),
1838 Z_BYTE
- to_byte
, from
, from_byte
))
1842 if (ret_string
|| ! EQ (current_buffer
->undo_list
, Qt
))
1843 deletion
= make_buffer_string_both (from
, from_byte
, to
, to_byte
, 1);
1847 /* Relocate all markers pointing into the new, larger gap
1848 to point at the end of the text before the gap.
1849 Do this before recording the deletion,
1850 so that undo handles this after reinserting the text. */
1851 adjust_markers_for_delete (from
, from_byte
, to
, to_byte
);
1853 if (! EQ (current_buffer
->undo_list
, Qt
))
1854 record_delete (from
, deletion
);
1857 /* Relocate point as if it were a marker. */
1859 adjust_point (from
- (PT
< to
? PT
: to
),
1860 from_byte
- (PT_BYTE
< to_byte
? PT_BYTE
: to_byte
));
1862 offset_intervals (current_buffer
, from
, - nchars_del
);
1864 /* Adjust the overlay center as needed. This must be done after
1865 adjusting the markers that bound the overlays. */
1866 adjust_overlays_for_delete (from
, nchars_del
);
1868 GAP_SIZE
+= nbytes_del
;
1869 ZV_BYTE
-= nbytes_del
;
1870 Z_BYTE
-= nbytes_del
;
1874 GPT_BYTE
= from_byte
;
1875 *(GPT_ADDR
) = 0; /* Put an anchor. */
1880 if (GPT
- BEG
< BEG_UNCHANGED
)
1881 BEG_UNCHANGED
= GPT
- BEG
;
1882 if (Z
- GPT
< END_UNCHANGED
)
1883 END_UNCHANGED
= Z
- GPT
;
1887 evaporate_overlays (from
);
1892 /* Call this if you're about to change the region of BUFFER from
1893 character positions START to END. This checks the read-only
1894 properties of the region, calls the necessary modification hooks,
1895 and warns the next redisplay that it should pay attention to that
1899 modify_region (buffer
, start
, end
)
1900 struct buffer
*buffer
;
1903 struct buffer
*old_buffer
= current_buffer
;
1905 if (buffer
!= old_buffer
)
1906 set_buffer_internal (buffer
);
1908 prepare_to_modify_buffer (start
, end
, NULL
);
1910 BUF_COMPUTE_UNCHANGED (buffer
, start
- 1, end
);
1912 if (MODIFF
<= SAVE_MODIFF
)
1913 record_first_change ();
1916 buffer
->point_before_scroll
= Qnil
;
1918 if (buffer
!= old_buffer
)
1919 set_buffer_internal (old_buffer
);
1922 /* Check that it is okay to modify the buffer between START and END,
1923 which are char positions.
1925 Run the before-change-function, if any. If intervals are in use,
1926 verify that the text to be modified is not read-only, and call
1927 any modification properties the text may have.
1929 If PRESERVE_PTR is nonzero, we relocate *PRESERVE_PTR
1930 by holding its value temporarily in a marker. */
1933 prepare_to_modify_buffer (start
, end
, preserve_ptr
)
1937 if (!NILP (current_buffer
->read_only
))
1938 Fbarf_if_buffer_read_only ();
1940 /* Let redisplay consider other windows than selected_window
1941 if modifying another buffer. */
1942 if (XBUFFER (XWINDOW (selected_window
)->buffer
) != current_buffer
)
1943 ++windows_or_buffers_changed
;
1945 if (BUF_INTERVALS (current_buffer
) != 0)
1949 Lisp_Object preserve_marker
;
1950 struct gcpro gcpro1
;
1951 preserve_marker
= Fcopy_marker (make_number (*preserve_ptr
), Qnil
);
1952 GCPRO1 (preserve_marker
);
1953 verify_interval_modification (current_buffer
, start
, end
);
1954 *preserve_ptr
= marker_position (preserve_marker
);
1955 unchain_marker (XMARKER (preserve_marker
));
1959 verify_interval_modification (current_buffer
, start
, end
);
1962 #ifdef CLASH_DETECTION
1963 if (!NILP (current_buffer
->file_truename
)
1964 /* Make binding buffer-file-name to nil effective. */
1965 && !NILP (current_buffer
->filename
)
1966 && SAVE_MODIFF
>= MODIFF
)
1967 lock_file (current_buffer
->file_truename
);
1969 /* At least warn if this file has changed on disk since it was visited. */
1970 if (!NILP (current_buffer
->filename
)
1971 && SAVE_MODIFF
>= MODIFF
1972 && NILP (Fverify_visited_file_modtime (Fcurrent_buffer ()))
1973 && !NILP (Ffile_exists_p (current_buffer
->filename
)))
1974 call1 (intern ("ask-user-about-supersession-threat"),
1975 current_buffer
->filename
);
1976 #endif /* not CLASH_DETECTION */
1978 signal_before_change (start
, end
, preserve_ptr
);
1980 if (current_buffer
->newline_cache
)
1981 invalidate_region_cache (current_buffer
,
1982 current_buffer
->newline_cache
,
1983 start
- BEG
, Z
- end
);
1984 if (current_buffer
->width_run_cache
)
1985 invalidate_region_cache (current_buffer
,
1986 current_buffer
->width_run_cache
,
1987 start
- BEG
, Z
- end
);
1989 Vdeactivate_mark
= Qt
;
1992 /* These macros work with an argument named `preserve_ptr'
1993 and a local variable named `preserve_marker'. */
1995 #define PRESERVE_VALUE \
1996 if (preserve_ptr && NILP (preserve_marker)) \
1997 preserve_marker = Fcopy_marker (make_number (*preserve_ptr), Qnil)
1999 #define RESTORE_VALUE \
2000 if (! NILP (preserve_marker)) \
2002 *preserve_ptr = marker_position (preserve_marker); \
2003 unchain_marker (XMARKER (preserve_marker)); \
2006 #define PRESERVE_START_END \
2007 if (NILP (start_marker)) \
2008 start_marker = Fcopy_marker (start, Qnil); \
2009 if (NILP (end_marker)) \
2010 end_marker = Fcopy_marker (end, Qnil);
2012 #define FETCH_START \
2013 (! NILP (start_marker) ? Fmarker_position (start_marker) : start)
2016 (! NILP (end_marker) ? Fmarker_position (end_marker) : end)
2018 /* Signal a change to the buffer immediately before it happens.
2019 START_INT and END_INT are the bounds of the text to be changed.
2021 If PRESERVE_PTR is nonzero, we relocate *PRESERVE_PTR
2022 by holding its value temporarily in a marker. */
2025 signal_before_change (start_int
, end_int
, preserve_ptr
)
2026 int start_int
, end_int
;
2029 Lisp_Object start
, end
;
2030 Lisp_Object start_marker
, end_marker
;
2031 Lisp_Object preserve_marker
;
2032 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2034 if (inhibit_modification_hooks
)
2037 start
= make_number (start_int
);
2038 end
= make_number (end_int
);
2039 preserve_marker
= Qnil
;
2040 start_marker
= Qnil
;
2042 GCPRO3 (preserve_marker
, start_marker
, end_marker
);
2044 /* If buffer is unmodified, run a special hook for that case. */
2045 if (SAVE_MODIFF
>= MODIFF
2046 && !NILP (Vfirst_change_hook
)
2047 && !NILP (Vrun_hooks
))
2051 call1 (Vrun_hooks
, Qfirst_change_hook
);
2054 /* Now run the before-change-functions if any. */
2055 if (!NILP (Vbefore_change_functions
))
2057 Lisp_Object args
[3];
2058 Lisp_Object before_change_functions
;
2059 Lisp_Object after_change_functions
;
2060 struct gcpro gcpro1
, gcpro2
;
2061 struct buffer
*old
= current_buffer
;
2067 /* "Bind" before-change-functions and after-change-functions
2068 to nil--but in a way that errors don't know about.
2069 That way, if there's an error in them, they will stay nil. */
2070 before_change_functions
= Vbefore_change_functions
;
2071 after_change_functions
= Vafter_change_functions
;
2072 Vbefore_change_functions
= Qnil
;
2073 Vafter_change_functions
= Qnil
;
2074 GCPRO2 (before_change_functions
, after_change_functions
);
2076 /* Actually run the hook functions. */
2077 args
[0] = Qbefore_change_functions
;
2078 args
[1] = FETCH_START
;
2079 args
[2] = FETCH_END
;
2080 run_hook_list_with_args (before_change_functions
, 3, args
);
2082 /* "Unbind" the variables we "bound" to nil. Beware a
2083 buffer-local hook which changes the buffer when run (e.g. W3). */
2084 if (old
!= current_buffer
)
2086 new = current_buffer
;
2087 set_buffer_internal (old
);
2088 Vbefore_change_functions
= before_change_functions
;
2089 Vafter_change_functions
= after_change_functions
;
2090 set_buffer_internal (new);
2094 Vbefore_change_functions
= before_change_functions
;
2095 Vafter_change_functions
= after_change_functions
;
2100 if (current_buffer
->overlays_before
|| current_buffer
->overlays_after
)
2103 report_overlay_modification (FETCH_START
, FETCH_END
, 0,
2104 FETCH_START
, FETCH_END
, Qnil
);
2107 if (! NILP (start_marker
))
2108 free_marker (start_marker
);
2109 if (! NILP (end_marker
))
2110 free_marker (end_marker
);
2115 /* Signal a change immediately after it happens.
2116 CHARPOS is the character position of the start of the changed text.
2117 LENDEL is the number of characters of the text before the change.
2118 (Not the whole buffer; just the part that was changed.)
2119 LENINS is the number of characters in that part of the text
2120 after the change. */
2123 signal_after_change (charpos
, lendel
, lenins
)
2124 int charpos
, lendel
, lenins
;
2126 if (inhibit_modification_hooks
)
2129 /* If we are deferring calls to the after-change functions
2130 and there are no before-change functions,
2131 just record the args that we were going to use. */
2132 if (! NILP (Vcombine_after_change_calls
)
2133 && NILP (Vbefore_change_functions
)
2134 && !current_buffer
->overlays_before
2135 && !current_buffer
->overlays_after
)
2139 if (!NILP (combine_after_change_list
)
2140 && current_buffer
!= XBUFFER (combine_after_change_buffer
))
2141 Fcombine_after_change_execute ();
2143 elt
= Fcons (make_number (charpos
- BEG
),
2144 Fcons (make_number (Z
- (charpos
- lendel
+ lenins
)),
2145 Fcons (make_number (lenins
- lendel
), Qnil
)));
2146 combine_after_change_list
2147 = Fcons (elt
, combine_after_change_list
);
2148 combine_after_change_buffer
= Fcurrent_buffer ();
2153 if (!NILP (combine_after_change_list
))
2154 Fcombine_after_change_execute ();
2156 if (!NILP (Vafter_change_functions
))
2158 Lisp_Object args
[4];
2159 Lisp_Object before_change_functions
;
2160 Lisp_Object after_change_functions
;
2161 struct buffer
*old
= current_buffer
;
2163 struct gcpro gcpro1
, gcpro2
;
2165 /* "Bind" before-change-functions and after-change-functions
2166 to nil--but in a way that errors don't know about.
2167 That way, if there's an error in them, they will stay nil. */
2168 before_change_functions
= Vbefore_change_functions
;
2169 after_change_functions
= Vafter_change_functions
;
2170 Vbefore_change_functions
= Qnil
;
2171 Vafter_change_functions
= Qnil
;
2172 GCPRO2 (before_change_functions
, after_change_functions
);
2174 /* Actually run the hook functions. */
2175 args
[0] = Qafter_change_functions
;
2176 XSETFASTINT (args
[1], charpos
);
2177 XSETFASTINT (args
[2], charpos
+ lenins
);
2178 XSETFASTINT (args
[3], lendel
);
2179 run_hook_list_with_args (after_change_functions
,
2182 /* "Unbind" the variables we "bound" to nil. Beware a
2183 buffer-local hook which changes the buffer when run (e.g. W3). */
2184 if (old
!= current_buffer
)
2186 new = current_buffer
;
2187 set_buffer_internal (old
);
2188 Vbefore_change_functions
= before_change_functions
;
2189 Vafter_change_functions
= after_change_functions
;
2190 set_buffer_internal (new);
2194 Vbefore_change_functions
= before_change_functions
;
2195 Vafter_change_functions
= after_change_functions
;
2200 if (current_buffer
->overlays_before
|| current_buffer
->overlays_after
)
2201 report_overlay_modification (make_number (charpos
),
2202 make_number (charpos
+ lenins
),
2204 make_number (charpos
),
2205 make_number (charpos
+ lenins
),
2206 make_number (lendel
));
2208 /* After an insertion, call the text properties
2209 insert-behind-hooks or insert-in-front-hooks. */
2211 report_interval_modification (make_number (charpos
),
2212 make_number (charpos
+ lenins
));
2216 Fcombine_after_change_execute_1 (val
)
2219 Vcombine_after_change_calls
= val
;
2223 DEFUN ("combine-after-change-execute", Fcombine_after_change_execute
,
2224 Scombine_after_change_execute
, 0, 0, 0,
2225 doc
: /* This function is for use internally in `combine-after-change-calls'. */)
2228 int count
= SPECPDL_INDEX ();
2229 int beg
, end
, change
;
2233 if (NILP (combine_after_change_list
))
2236 record_unwind_protect (Fset_buffer
, Fcurrent_buffer ());
2238 Fset_buffer (combine_after_change_buffer
);
2240 /* # chars unchanged at beginning of buffer. */
2242 /* # chars unchanged at end of buffer. */
2244 /* Total amount of insertion (negative for deletion). */
2247 /* Scan the various individual changes,
2248 accumulating the range info in BEG, END and CHANGE. */
2249 for (tail
= combine_after_change_list
; CONSP (tail
);
2253 int thisbeg
, thisend
, thischange
;
2255 /* Extract the info from the next element. */
2259 thisbeg
= XINT (XCAR (elt
));
2264 thisend
= XINT (XCAR (elt
));
2269 thischange
= XINT (XCAR (elt
));
2271 /* Merge this range into the accumulated range. */
2272 change
+= thischange
;
2279 /* Get the current start and end positions of the range
2280 that was changed. */
2284 /* We are about to handle these, so discard them. */
2285 combine_after_change_list
= Qnil
;
2287 /* Now run the after-change functions for real.
2288 Turn off the flag that defers them. */
2289 record_unwind_protect (Fcombine_after_change_execute_1
,
2290 Vcombine_after_change_calls
);
2291 signal_after_change (begpos
, endpos
- begpos
- change
, endpos
- begpos
);
2292 update_compositions (begpos
, endpos
, CHECK_ALL
);
2294 return unbind_to (count
, Qnil
);
2300 staticpro (&combine_after_change_list
);
2301 combine_after_change_list
= Qnil
;
2302 combine_after_change_buffer
= Qnil
;
2304 DEFVAR_BOOL ("check-markers-debug-flag", &check_markers_debug_flag
,
2305 doc
: /* Non-nil means enable debugging checks for invalid marker positions. */);
2306 check_markers_debug_flag
= 0;
2307 DEFVAR_LISP ("combine-after-change-calls", &Vcombine_after_change_calls
,
2308 doc
: /* Used internally by the `combine-after-change-calls' macro. */);
2309 Vcombine_after_change_calls
= Qnil
;
2311 DEFVAR_BOOL ("inhibit-modification-hooks", &inhibit_modification_hooks
,
2312 doc
: /* Non-nil means don't run any of the hooks that respond to buffer changes.
2313 This affects `before-change-functions' and `after-change-functions',
2314 as well as hooks attached to text properties and overlays. */);
2315 inhibit_modification_hooks
= 0;
2316 Qinhibit_modification_hooks
= intern ("inhibit-modification-hooks");
2317 staticpro (&Qinhibit_modification_hooks
);
2319 defsubr (&Scombine_after_change_execute
);
2322 /* arch-tag: 9b34b886-47d7-465e-a234-299af411b23d
2323 (do not change this comment) */