Commit | Line | Data |
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b45433b3 | 1 | /* Buffer insertion/deletion and gap motion for GNU Emacs. |
e45fb8bf | 2 | Copyright (C) 1985, 1986, 1993, 1994 Free Software Foundation, Inc. |
b45433b3 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
18160b98 | 21 | #include <config.h> |
b45433b3 | 22 | #include "lisp.h" |
679194a6 | 23 | #include "intervals.h" |
b45433b3 JB |
24 | #include "buffer.h" |
25 | #include "window.h" | |
d014bf88 | 26 | #include "blockinput.h" |
b45433b3 | 27 | |
395ec62e KH |
28 | static void insert_1 (); |
29 | static void insert_from_string_1 (); | |
2bcaed71 KH |
30 | static void gap_left (); |
31 | static void gap_right (); | |
32 | static void adjust_markers (); | |
a27a38d8 | 33 | static void adjust_point (); |
395ec62e | 34 | |
b45433b3 JB |
35 | /* Move gap to position `pos'. |
36 | Note that this can quit! */ | |
37 | ||
38 | move_gap (pos) | |
39 | int pos; | |
40 | { | |
41 | if (pos < GPT) | |
42 | gap_left (pos, 0); | |
43 | else if (pos > GPT) | |
44 | gap_right (pos); | |
45 | } | |
46 | ||
47 | /* Move the gap to POS, which is less than the current GPT. | |
48 | If NEWGAP is nonzero, then don't update beg_unchanged and end_unchanged. */ | |
49 | ||
2bcaed71 | 50 | static void |
b45433b3 JB |
51 | gap_left (pos, newgap) |
52 | register int pos; | |
53 | int newgap; | |
54 | { | |
55 | register unsigned char *to, *from; | |
56 | register int i; | |
57 | int new_s1; | |
58 | ||
59 | pos--; | |
60 | ||
61 | if (!newgap) | |
62 | { | |
63 | if (unchanged_modified == MODIFF) | |
64 | { | |
65 | beg_unchanged = pos; | |
66 | end_unchanged = Z - pos - 1; | |
67 | } | |
68 | else | |
69 | { | |
70 | if (Z - GPT < end_unchanged) | |
71 | end_unchanged = Z - GPT; | |
72 | if (pos < beg_unchanged) | |
73 | beg_unchanged = pos; | |
74 | } | |
75 | } | |
76 | ||
77 | i = GPT; | |
78 | to = GAP_END_ADDR; | |
79 | from = GPT_ADDR; | |
80 | new_s1 = GPT - BEG; | |
81 | ||
82 | /* Now copy the characters. To move the gap down, | |
83 | copy characters up. */ | |
84 | ||
85 | while (1) | |
86 | { | |
87 | /* I gets number of characters left to copy. */ | |
88 | i = new_s1 - pos; | |
89 | if (i == 0) | |
90 | break; | |
91 | /* If a quit is requested, stop copying now. | |
92 | Change POS to be where we have actually moved the gap to. */ | |
93 | if (QUITP) | |
94 | { | |
95 | pos = new_s1; | |
96 | break; | |
97 | } | |
98 | /* Move at most 32000 chars before checking again for a quit. */ | |
99 | if (i > 32000) | |
100 | i = 32000; | |
101 | #ifdef GAP_USE_BCOPY | |
102 | if (i >= 128 | |
103 | /* bcopy is safe if the two areas of memory do not overlap | |
104 | or on systems where bcopy is always safe for moving upward. */ | |
105 | && (BCOPY_UPWARD_SAFE | |
106 | || to - from >= 128)) | |
107 | { | |
108 | /* If overlap is not safe, avoid it by not moving too many | |
109 | characters at once. */ | |
110 | if (!BCOPY_UPWARD_SAFE && i > to - from) | |
111 | i = to - from; | |
112 | new_s1 -= i; | |
113 | from -= i, to -= i; | |
114 | bcopy (from, to, i); | |
115 | } | |
116 | else | |
117 | #endif | |
118 | { | |
119 | new_s1 -= i; | |
120 | while (--i >= 0) | |
121 | *--to = *--from; | |
122 | } | |
123 | } | |
124 | ||
125 | /* Adjust markers, and buffer data structure, to put the gap at POS. | |
126 | POS is where the loop above stopped, which may be what was specified | |
127 | or may be where a quit was detected. */ | |
128 | adjust_markers (pos + 1, GPT, GAP_SIZE); | |
129 | GPT = pos + 1; | |
130 | QUIT; | |
131 | } | |
132 | ||
2bcaed71 | 133 | static void |
b45433b3 JB |
134 | gap_right (pos) |
135 | register int pos; | |
136 | { | |
137 | register unsigned char *to, *from; | |
138 | register int i; | |
139 | int new_s1; | |
140 | ||
141 | pos--; | |
142 | ||
143 | if (unchanged_modified == MODIFF) | |
144 | { | |
145 | beg_unchanged = pos; | |
146 | end_unchanged = Z - pos - 1; | |
147 | } | |
148 | else | |
149 | { | |
150 | if (Z - pos - 1 < end_unchanged) | |
151 | end_unchanged = Z - pos - 1; | |
152 | if (GPT - BEG < beg_unchanged) | |
153 | beg_unchanged = GPT - BEG; | |
154 | } | |
155 | ||
156 | i = GPT; | |
157 | from = GAP_END_ADDR; | |
158 | to = GPT_ADDR; | |
159 | new_s1 = GPT - 1; | |
160 | ||
161 | /* Now copy the characters. To move the gap up, | |
162 | copy characters down. */ | |
163 | ||
164 | while (1) | |
165 | { | |
166 | /* I gets number of characters left to copy. */ | |
167 | i = pos - new_s1; | |
168 | if (i == 0) | |
169 | break; | |
170 | /* If a quit is requested, stop copying now. | |
171 | Change POS to be where we have actually moved the gap to. */ | |
172 | if (QUITP) | |
173 | { | |
174 | pos = new_s1; | |
175 | break; | |
176 | } | |
177 | /* Move at most 32000 chars before checking again for a quit. */ | |
178 | if (i > 32000) | |
179 | i = 32000; | |
180 | #ifdef GAP_USE_BCOPY | |
181 | if (i >= 128 | |
182 | /* bcopy is safe if the two areas of memory do not overlap | |
183 | or on systems where bcopy is always safe for moving downward. */ | |
184 | && (BCOPY_DOWNWARD_SAFE | |
185 | || from - to >= 128)) | |
186 | { | |
187 | /* If overlap is not safe, avoid it by not moving too many | |
188 | characters at once. */ | |
189 | if (!BCOPY_DOWNWARD_SAFE && i > from - to) | |
190 | i = from - to; | |
191 | new_s1 += i; | |
192 | bcopy (from, to, i); | |
193 | from += i, to += i; | |
194 | } | |
195 | else | |
196 | #endif | |
197 | { | |
198 | new_s1 += i; | |
199 | while (--i >= 0) | |
200 | *to++ = *from++; | |
201 | } | |
202 | } | |
203 | ||
204 | adjust_markers (GPT + GAP_SIZE, pos + 1 + GAP_SIZE, - GAP_SIZE); | |
205 | GPT = pos + 1; | |
206 | QUIT; | |
207 | } | |
208 | ||
209 | /* Add `amount' to the position of every marker in the current buffer | |
210 | whose current position is between `from' (exclusive) and `to' (inclusive). | |
211 | Also, any markers past the outside of that interval, in the direction | |
212 | of adjustment, are first moved back to the near end of the interval | |
213 | and then adjusted by `amount'. */ | |
214 | ||
2bcaed71 | 215 | static void |
b45433b3 JB |
216 | adjust_markers (from, to, amount) |
217 | register int from, to, amount; | |
218 | { | |
219 | Lisp_Object marker; | |
220 | register struct Lisp_Marker *m; | |
221 | register int mpos; | |
222 | ||
223 | marker = current_buffer->markers; | |
224 | ||
d427b66a | 225 | while (!NILP (marker)) |
b45433b3 JB |
226 | { |
227 | m = XMARKER (marker); | |
228 | mpos = m->bufpos; | |
229 | if (amount > 0) | |
230 | { | |
231 | if (mpos > to && mpos < to + amount) | |
232 | mpos = to + amount; | |
233 | } | |
234 | else | |
235 | { | |
236 | if (mpos > from + amount && mpos <= from) | |
237 | mpos = from + amount; | |
238 | } | |
239 | if (mpos > from && mpos <= to) | |
240 | mpos += amount; | |
241 | m->bufpos = mpos; | |
242 | marker = m->chain; | |
243 | } | |
244 | } | |
a27a38d8 KH |
245 | |
246 | /* Add the specified amount to point. This is used only when the value | |
247 | of point changes due to an insert or delete; it does not represent | |
248 | a conceptual change in point as a marker. In particular, point is | |
249 | not crossing any interval boundaries, so there's no need to use the | |
250 | usual SET_PT macro. In fact it would be incorrect to do so, because | |
251 | either the old or the new value of point is out of synch with the | |
252 | current set of intervals. */ | |
253 | static void | |
254 | adjust_point (amount) | |
255 | { | |
256 | current_buffer->text.pt += amount; | |
257 | } | |
b45433b3 JB |
258 | \f |
259 | /* Make the gap INCREMENT characters longer. */ | |
260 | ||
261 | make_gap (increment) | |
262 | int increment; | |
263 | { | |
264 | unsigned char *result; | |
265 | Lisp_Object tem; | |
266 | int real_gap_loc; | |
267 | int old_gap_size; | |
268 | ||
269 | /* If we have to get more space, get enough to last a while. */ | |
270 | increment += 2000; | |
271 | ||
9ac0d9e0 | 272 | BLOCK_INPUT; |
b45433b3 | 273 | result = BUFFER_REALLOC (BEG_ADDR, (Z - BEG + GAP_SIZE + increment)); |
9ac0d9e0 JB |
274 | UNBLOCK_INPUT; |
275 | ||
b45433b3 JB |
276 | if (result == 0) |
277 | memory_full (); | |
278 | BEG_ADDR = result; | |
279 | ||
280 | /* Prevent quitting in move_gap. */ | |
281 | tem = Vinhibit_quit; | |
282 | Vinhibit_quit = Qt; | |
283 | ||
284 | real_gap_loc = GPT; | |
285 | old_gap_size = GAP_SIZE; | |
286 | ||
287 | /* Call the newly allocated space a gap at the end of the whole space. */ | |
288 | GPT = Z + GAP_SIZE; | |
289 | GAP_SIZE = increment; | |
290 | ||
291 | /* Move the new gap down to be consecutive with the end of the old one. | |
292 | This adjusts the markers properly too. */ | |
293 | gap_left (real_gap_loc + old_gap_size, 1); | |
294 | ||
295 | /* Now combine the two into one large gap. */ | |
296 | GAP_SIZE += old_gap_size; | |
297 | GPT = real_gap_loc; | |
298 | ||
299 | Vinhibit_quit = tem; | |
300 | } | |
301 | \f | |
302 | /* Insert a string of specified length before point. | |
303 | DO NOT use this for the contents of a Lisp string! | |
304 | prepare_to_modify_buffer could relocate the string. */ | |
305 | ||
306 | insert (string, length) | |
307 | register unsigned char *string; | |
308 | register length; | |
309 | { | |
395ec62e KH |
310 | if (length > 0) |
311 | { | |
cd11ef31 RS |
312 | insert_1 (string, length, 0); |
313 | signal_after_change (PT-length, 0, length); | |
314 | } | |
315 | } | |
316 | ||
317 | insert_and_inherit (string, length) | |
318 | register unsigned char *string; | |
319 | register length; | |
320 | { | |
321 | if (length > 0) | |
322 | { | |
323 | insert_1 (string, length, 1); | |
2bcaed71 | 324 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
325 | } |
326 | } | |
b45433b3 | 327 | |
395ec62e | 328 | static void |
cd11ef31 | 329 | insert_1 (string, length, inherit) |
395ec62e KH |
330 | register unsigned char *string; |
331 | register length; | |
cd11ef31 | 332 | int inherit; |
395ec62e KH |
333 | { |
334 | register Lisp_Object temp; | |
b45433b3 JB |
335 | |
336 | /* Make sure point-max won't overflow after this insertion. */ | |
337 | XSET (temp, Lisp_Int, length + Z); | |
338 | if (length + Z != XINT (temp)) | |
339 | error ("maximum buffer size exceeded"); | |
340 | ||
2bcaed71 | 341 | prepare_to_modify_buffer (PT, PT); |
b45433b3 | 342 | |
2bcaed71 KH |
343 | if (PT != GPT) |
344 | move_gap (PT); | |
b45433b3 JB |
345 | if (GAP_SIZE < length) |
346 | make_gap (length - GAP_SIZE); | |
347 | ||
2bcaed71 | 348 | record_insert (PT, length); |
b45433b3 JB |
349 | MODIFF++; |
350 | ||
351 | bcopy (string, GPT_ADDR, length); | |
352 | ||
679194a6 | 353 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
2bcaed71 | 354 | offset_intervals (current_buffer, PT, length); |
679194a6 | 355 | |
b45433b3 JB |
356 | GAP_SIZE -= length; |
357 | GPT += length; | |
358 | ZV += length; | |
359 | Z += length; | |
a27a38d8 | 360 | adjust_point (length); |
cd11ef31 RS |
361 | |
362 | if (!inherit) | |
363 | Fset_text_properties (make_number (PT - length), make_number (PT), | |
364 | Qnil, Qnil); | |
b45433b3 JB |
365 | } |
366 | ||
679194a6 JA |
367 | /* Insert the part of the text of STRING, a Lisp object assumed to be |
368 | of type string, consisting of the LENGTH characters starting at | |
369 | position POS. If the text of STRING has properties, they are absorbed | |
370 | into the buffer. | |
371 | ||
372 | It does not work to use `insert' for this, because a GC could happen | |
7e1ea612 JB |
373 | before we bcopy the stuff into the buffer, and relocate the string |
374 | without insert noticing. */ | |
679194a6 | 375 | |
9391e591 | 376 | insert_from_string (string, pos, length, inherit) |
b45433b3 JB |
377 | Lisp_Object string; |
378 | register int pos, length; | |
9391e591 | 379 | int inherit; |
395ec62e KH |
380 | { |
381 | if (length > 0) | |
382 | { | |
383 | insert_from_string_1 (string, pos, length, inherit); | |
2bcaed71 | 384 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
385 | } |
386 | } | |
387 | ||
388 | static void | |
389 | insert_from_string_1 (string, pos, length, inherit) | |
390 | Lisp_Object string; | |
391 | register int pos, length; | |
392 | int inherit; | |
b45433b3 JB |
393 | { |
394 | register Lisp_Object temp; | |
395 | struct gcpro gcpro1; | |
396 | ||
b45433b3 JB |
397 | /* Make sure point-max won't overflow after this insertion. */ |
398 | XSET (temp, Lisp_Int, length + Z); | |
399 | if (length + Z != XINT (temp)) | |
400 | error ("maximum buffer size exceeded"); | |
401 | ||
402 | GCPRO1 (string); | |
2bcaed71 | 403 | prepare_to_modify_buffer (PT, PT); |
b45433b3 | 404 | |
2bcaed71 KH |
405 | if (PT != GPT) |
406 | move_gap (PT); | |
b45433b3 JB |
407 | if (GAP_SIZE < length) |
408 | make_gap (length - GAP_SIZE); | |
409 | ||
2bcaed71 | 410 | record_insert (PT, length); |
b45433b3 JB |
411 | MODIFF++; |
412 | UNGCPRO; | |
413 | ||
414 | bcopy (XSTRING (string)->data, GPT_ADDR, length); | |
415 | ||
679194a6 | 416 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
2bcaed71 | 417 | offset_intervals (current_buffer, PT, length); |
679194a6 | 418 | |
b45433b3 JB |
419 | GAP_SIZE -= length; |
420 | GPT += length; | |
421 | ZV += length; | |
422 | Z += length; | |
679194a6 JA |
423 | |
424 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ | |
2bcaed71 | 425 | graft_intervals_into_buffer (XSTRING (string)->intervals, PT, length, |
9391e591 | 426 | current_buffer, inherit); |
679194a6 | 427 | |
a27a38d8 | 428 | adjust_point (length); |
b45433b3 JB |
429 | } |
430 | ||
431 | /* Insert the character C before point */ | |
432 | ||
433 | void | |
434 | insert_char (c) | |
435 | unsigned char c; | |
436 | { | |
437 | insert (&c, 1); | |
438 | } | |
439 | ||
440 | /* Insert the null-terminated string S before point */ | |
441 | ||
442 | void | |
443 | insert_string (s) | |
444 | char *s; | |
445 | { | |
446 | insert (s, strlen (s)); | |
447 | } | |
448 | ||
449 | /* Like `insert' except that all markers pointing at the place where | |
450 | the insertion happens are adjusted to point after it. | |
451 | Don't use this function to insert part of a Lisp string, | |
452 | since gc could happen and relocate it. */ | |
453 | ||
454 | insert_before_markers (string, length) | |
455 | unsigned char *string; | |
456 | register int length; | |
457 | { | |
395ec62e KH |
458 | if (length > 0) |
459 | { | |
2bcaed71 | 460 | register int opoint = PT; |
cd11ef31 | 461 | insert_1 (string, length, 1); |
395ec62e | 462 | adjust_markers (opoint - 1, opoint, length); |
2bcaed71 | 463 | signal_after_change (PT-length, 0, length); |
395ec62e | 464 | } |
b45433b3 JB |
465 | } |
466 | ||
467 | /* Insert part of a Lisp string, relocating markers after. */ | |
468 | ||
9391e591 | 469 | insert_from_string_before_markers (string, pos, length, inherit) |
b45433b3 JB |
470 | Lisp_Object string; |
471 | register int pos, length; | |
9391e591 | 472 | int inherit; |
b45433b3 | 473 | { |
395ec62e KH |
474 | if (length > 0) |
475 | { | |
2bcaed71 | 476 | register int opoint = PT; |
395ec62e KH |
477 | insert_from_string_1 (string, pos, length, inherit); |
478 | adjust_markers (opoint - 1, opoint, length); | |
2bcaed71 | 479 | signal_after_change (PT-length, 0, length); |
395ec62e | 480 | } |
b45433b3 JB |
481 | } |
482 | \f | |
483 | /* Delete characters in current buffer | |
484 | from FROM up to (but not including) TO. */ | |
485 | ||
486 | del_range (from, to) | |
487 | register int from, to; | |
47c64747 RS |
488 | { |
489 | return del_range_1 (from, to, 1); | |
490 | } | |
491 | ||
492 | /* Like del_range; PREPARE says whether to call prepare_to_modify_buffer. */ | |
493 | ||
494 | del_range_1 (from, to, prepare) | |
495 | register int from, to, prepare; | |
b45433b3 JB |
496 | { |
497 | register int numdel; | |
498 | ||
499 | /* Make args be valid */ | |
500 | if (from < BEGV) | |
501 | from = BEGV; | |
502 | if (to > ZV) | |
503 | to = ZV; | |
504 | ||
505 | if ((numdel = to - from) <= 0) | |
506 | return; | |
507 | ||
508 | /* Make sure the gap is somewhere in or next to what we are deleting. */ | |
509 | if (from > GPT) | |
510 | gap_right (from); | |
511 | if (to < GPT) | |
512 | gap_left (to, 0); | |
513 | ||
47c64747 RS |
514 | if (prepare) |
515 | prepare_to_modify_buffer (from, to); | |
b45433b3 | 516 | |
be09561e RS |
517 | record_delete (from, numdel); |
518 | MODIFF++; | |
519 | ||
b45433b3 | 520 | /* Relocate point as if it were a marker. */ |
2bcaed71 | 521 | if (from < PT) |
a27a38d8 | 522 | adjust_point (from - (PT < to ? PT : to)); |
b45433b3 | 523 | |
16032db6 | 524 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
83010cd6 | 525 | offset_intervals (current_buffer, from, - numdel); |
16032db6 | 526 | |
b45433b3 JB |
527 | /* Relocate all markers pointing into the new, larger gap |
528 | to point at the end of the text before the gap. */ | |
529 | adjust_markers (to + GAP_SIZE, to + GAP_SIZE, - numdel - GAP_SIZE); | |
530 | ||
531 | GAP_SIZE += numdel; | |
532 | ZV -= numdel; | |
533 | Z -= numdel; | |
534 | GPT = from; | |
535 | ||
536 | if (GPT - BEG < beg_unchanged) | |
537 | beg_unchanged = GPT - BEG; | |
538 | if (Z - GPT < end_unchanged) | |
539 | end_unchanged = Z - GPT; | |
540 | ||
541 | signal_after_change (from, numdel, 0); | |
542 | } | |
543 | \f | |
04a759c8 JB |
544 | /* Call this if you're about to change the region of BUFFER from START |
545 | to END. This checks the read-only properties of the region, calls | |
546 | the necessary modification hooks, and warns the next redisplay that | |
547 | it should pay attention to that area. */ | |
548 | modify_region (buffer, start, end) | |
549 | struct buffer *buffer; | |
b45433b3 JB |
550 | int start, end; |
551 | { | |
04a759c8 JB |
552 | struct buffer *old_buffer = current_buffer; |
553 | ||
554 | if (buffer != old_buffer) | |
555 | set_buffer_internal (buffer); | |
556 | ||
b45433b3 JB |
557 | prepare_to_modify_buffer (start, end); |
558 | ||
559 | if (start - 1 < beg_unchanged || unchanged_modified == MODIFF) | |
560 | beg_unchanged = start - 1; | |
561 | if (Z - end < end_unchanged | |
562 | || unchanged_modified == MODIFF) | |
563 | end_unchanged = Z - end; | |
83010cd6 RS |
564 | |
565 | if (MODIFF <= current_buffer->save_modified) | |
566 | record_first_change (); | |
b45433b3 | 567 | MODIFF++; |
04a759c8 JB |
568 | |
569 | if (buffer != old_buffer) | |
570 | set_buffer_internal (old_buffer); | |
b45433b3 JB |
571 | } |
572 | ||
573 | /* Check that it is okay to modify the buffer between START and END. | |
679194a6 JA |
574 | Run the before-change-function, if any. If intervals are in use, |
575 | verify that the text to be modified is not read-only, and call | |
576 | any modification properties the text may have. */ | |
b45433b3 JB |
577 | |
578 | prepare_to_modify_buffer (start, end) | |
579 | Lisp_Object start, end; | |
580 | { | |
d427b66a | 581 | if (!NILP (current_buffer->read_only)) |
b45433b3 JB |
582 | Fbarf_if_buffer_read_only (); |
583 | ||
679194a6 JA |
584 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
585 | verify_interval_modification (current_buffer, start, end); | |
b45433b3 | 586 | |
f256353c RS |
587 | verify_overlay_modification (start, end); |
588 | ||
b45433b3 | 589 | #ifdef CLASH_DETECTION |
d427b66a | 590 | if (!NILP (current_buffer->filename) |
b45433b3 JB |
591 | && current_buffer->save_modified >= MODIFF) |
592 | lock_file (current_buffer->filename); | |
593 | #else | |
594 | /* At least warn if this file has changed on disk since it was visited. */ | |
d427b66a | 595 | if (!NILP (current_buffer->filename) |
b45433b3 | 596 | && current_buffer->save_modified >= MODIFF |
d427b66a JB |
597 | && NILP (Fverify_visited_file_modtime (Fcurrent_buffer ())) |
598 | && !NILP (Ffile_exists_p (current_buffer->filename))) | |
b45433b3 JB |
599 | call1 (intern ("ask-user-about-supersession-threat"), |
600 | current_buffer->filename); | |
601 | #endif /* not CLASH_DETECTION */ | |
602 | ||
603 | signal_before_change (start, end); | |
2f545eea RS |
604 | |
605 | Vdeactivate_mark = Qt; | |
b45433b3 JB |
606 | } |
607 | \f | |
608 | static Lisp_Object | |
609 | before_change_function_restore (value) | |
610 | Lisp_Object value; | |
611 | { | |
612 | Vbefore_change_function = value; | |
613 | } | |
614 | ||
615 | static Lisp_Object | |
616 | after_change_function_restore (value) | |
617 | Lisp_Object value; | |
618 | { | |
619 | Vafter_change_function = value; | |
620 | } | |
621 | ||
e45fb8bf RS |
622 | static Lisp_Object |
623 | before_change_functions_restore (value) | |
624 | Lisp_Object value; | |
625 | { | |
626 | Vbefore_change_functions = value; | |
627 | } | |
628 | ||
629 | static Lisp_Object | |
630 | after_change_functions_restore (value) | |
631 | Lisp_Object value; | |
632 | { | |
633 | Vafter_change_functions = value; | |
634 | } | |
635 | ||
eb8c3be9 | 636 | /* Signal a change to the buffer immediately before it happens. |
b45433b3 JB |
637 | START and END are the bounds of the text to be changed, |
638 | as Lisp objects. */ | |
639 | ||
640 | signal_before_change (start, end) | |
641 | Lisp_Object start, end; | |
642 | { | |
643 | /* If buffer is unmodified, run a special hook for that case. */ | |
644 | if (current_buffer->save_modified >= MODIFF | |
dbc4e1c1 JB |
645 | && !NILP (Vfirst_change_hook) |
646 | && !NILP (Vrun_hooks)) | |
647 | call1 (Vrun_hooks, Qfirst_change_hook); | |
648 | ||
b45433b3 | 649 | /* Now in any case run the before-change-function if any. */ |
d427b66a | 650 | if (!NILP (Vbefore_change_function)) |
b45433b3 JB |
651 | { |
652 | int count = specpdl_ptr - specpdl; | |
653 | Lisp_Object function; | |
654 | ||
655 | function = Vbefore_change_function; | |
e45fb8bf | 656 | |
b45433b3 JB |
657 | record_unwind_protect (after_change_function_restore, |
658 | Vafter_change_function); | |
659 | record_unwind_protect (before_change_function_restore, | |
660 | Vbefore_change_function); | |
e45fb8bf RS |
661 | record_unwind_protect (after_change_functions_restore, |
662 | Vafter_change_functions); | |
663 | record_unwind_protect (before_change_functions_restore, | |
664 | Vbefore_change_functions); | |
b45433b3 JB |
665 | Vafter_change_function = Qnil; |
666 | Vbefore_change_function = Qnil; | |
e45fb8bf RS |
667 | Vafter_change_functions = Qnil; |
668 | Vbefore_change_functions = Qnil; | |
b45433b3 JB |
669 | |
670 | call2 (function, start, end); | |
671 | unbind_to (count, Qnil); | |
672 | } | |
e45fb8bf RS |
673 | |
674 | /* Now in any case run the before-change-function if any. */ | |
675 | if (!NILP (Vbefore_change_functions)) | |
676 | { | |
677 | int count = specpdl_ptr - specpdl; | |
678 | Lisp_Object functions; | |
679 | ||
680 | functions = Vbefore_change_functions; | |
681 | ||
682 | record_unwind_protect (after_change_function_restore, | |
683 | Vafter_change_function); | |
684 | record_unwind_protect (before_change_function_restore, | |
685 | Vbefore_change_function); | |
686 | record_unwind_protect (after_change_functions_restore, | |
687 | Vafter_change_functions); | |
688 | record_unwind_protect (before_change_functions_restore, | |
689 | Vbefore_change_functions); | |
690 | Vafter_change_function = Qnil; | |
691 | Vbefore_change_function = Qnil; | |
692 | Vafter_change_functions = Qnil; | |
693 | Vbefore_change_functions = Qnil; | |
694 | ||
695 | while (CONSP (functions)) | |
696 | { | |
697 | call2 (XCONS (functions)->car, start, end); | |
698 | functions = XCONS (functions)->cdr; | |
699 | } | |
700 | unbind_to (count, Qnil); | |
701 | } | |
b45433b3 JB |
702 | } |
703 | ||
eb8c3be9 | 704 | /* Signal a change immediately after it happens. |
b45433b3 JB |
705 | POS is the address of the start of the changed text. |
706 | LENDEL is the number of characters of the text before the change. | |
707 | (Not the whole buffer; just the part that was changed.) | |
708 | LENINS is the number of characters in the changed text. */ | |
709 | ||
710 | signal_after_change (pos, lendel, lenins) | |
711 | int pos, lendel, lenins; | |
712 | { | |
d427b66a | 713 | if (!NILP (Vafter_change_function)) |
b45433b3 JB |
714 | { |
715 | int count = specpdl_ptr - specpdl; | |
716 | Lisp_Object function; | |
717 | function = Vafter_change_function; | |
718 | ||
719 | record_unwind_protect (after_change_function_restore, | |
720 | Vafter_change_function); | |
721 | record_unwind_protect (before_change_function_restore, | |
722 | Vbefore_change_function); | |
e45fb8bf RS |
723 | record_unwind_protect (after_change_functions_restore, |
724 | Vafter_change_functions); | |
725 | record_unwind_protect (before_change_functions_restore, | |
726 | Vbefore_change_functions); | |
b45433b3 JB |
727 | Vafter_change_function = Qnil; |
728 | Vbefore_change_function = Qnil; | |
e45fb8bf RS |
729 | Vafter_change_functions = Qnil; |
730 | Vbefore_change_functions = Qnil; | |
b45433b3 JB |
731 | |
732 | call3 (function, make_number (pos), make_number (pos + lenins), | |
733 | make_number (lendel)); | |
734 | unbind_to (count, Qnil); | |
735 | } | |
e45fb8bf RS |
736 | if (!NILP (Vafter_change_functions)) |
737 | { | |
738 | int count = specpdl_ptr - specpdl; | |
739 | Lisp_Object functions; | |
740 | functions = Vafter_change_functions; | |
741 | ||
742 | record_unwind_protect (after_change_function_restore, | |
743 | Vafter_change_function); | |
744 | record_unwind_protect (before_change_function_restore, | |
745 | Vbefore_change_function); | |
746 | record_unwind_protect (after_change_functions_restore, | |
747 | Vafter_change_functions); | |
748 | record_unwind_protect (before_change_functions_restore, | |
749 | Vbefore_change_functions); | |
750 | Vafter_change_function = Qnil; | |
751 | Vbefore_change_function = Qnil; | |
752 | Vafter_change_functions = Qnil; | |
753 | Vbefore_change_functions = Qnil; | |
754 | ||
755 | while (CONSP (functions)) | |
756 | { | |
757 | call3 (XCONS (functions)->car, | |
758 | make_number (pos), make_number (pos + lenins), | |
759 | make_number (lendel)); | |
760 | functions = XCONS (functions)->cdr; | |
761 | } | |
762 | unbind_to (count, Qnil); | |
763 | } | |
b45433b3 | 764 | } |