Commit | Line | Data |
---|---|---|
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 | 274 | |
b45433b3 | 275 | if (result == 0) |
270c2138 RS |
276 | { |
277 | UNBLOCK_INPUT; | |
278 | memory_full (); | |
279 | } | |
280 | ||
281 | /* We can't unblock until the new address is properly stored. */ | |
b45433b3 | 282 | BEG_ADDR = result; |
270c2138 | 283 | UNBLOCK_INPUT; |
b45433b3 JB |
284 | |
285 | /* Prevent quitting in move_gap. */ | |
286 | tem = Vinhibit_quit; | |
287 | Vinhibit_quit = Qt; | |
288 | ||
289 | real_gap_loc = GPT; | |
290 | old_gap_size = GAP_SIZE; | |
291 | ||
292 | /* Call the newly allocated space a gap at the end of the whole space. */ | |
293 | GPT = Z + GAP_SIZE; | |
294 | GAP_SIZE = increment; | |
295 | ||
296 | /* Move the new gap down to be consecutive with the end of the old one. | |
297 | This adjusts the markers properly too. */ | |
298 | gap_left (real_gap_loc + old_gap_size, 1); | |
299 | ||
300 | /* Now combine the two into one large gap. */ | |
301 | GAP_SIZE += old_gap_size; | |
302 | GPT = real_gap_loc; | |
303 | ||
304 | Vinhibit_quit = tem; | |
305 | } | |
306 | \f | |
307 | /* Insert a string of specified length before point. | |
308 | DO NOT use this for the contents of a Lisp string! | |
309 | prepare_to_modify_buffer could relocate the string. */ | |
310 | ||
311 | insert (string, length) | |
312 | register unsigned char *string; | |
313 | register length; | |
314 | { | |
395ec62e KH |
315 | if (length > 0) |
316 | { | |
cd11ef31 RS |
317 | insert_1 (string, length, 0); |
318 | signal_after_change (PT-length, 0, length); | |
319 | } | |
320 | } | |
321 | ||
322 | insert_and_inherit (string, length) | |
323 | register unsigned char *string; | |
324 | register length; | |
325 | { | |
326 | if (length > 0) | |
327 | { | |
328 | insert_1 (string, length, 1); | |
2bcaed71 | 329 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
330 | } |
331 | } | |
b45433b3 | 332 | |
395ec62e | 333 | static void |
cd11ef31 | 334 | insert_1 (string, length, inherit) |
395ec62e KH |
335 | register unsigned char *string; |
336 | register length; | |
cd11ef31 | 337 | int inherit; |
395ec62e KH |
338 | { |
339 | register Lisp_Object temp; | |
b45433b3 JB |
340 | |
341 | /* Make sure point-max won't overflow after this insertion. */ | |
eb7db9e6 | 342 | XSETINT (temp, length + Z); |
b45433b3 JB |
343 | if (length + Z != XINT (temp)) |
344 | error ("maximum buffer size exceeded"); | |
345 | ||
2bcaed71 | 346 | prepare_to_modify_buffer (PT, PT); |
b45433b3 | 347 | |
2bcaed71 KH |
348 | if (PT != GPT) |
349 | move_gap (PT); | |
b45433b3 JB |
350 | if (GAP_SIZE < length) |
351 | make_gap (length - GAP_SIZE); | |
352 | ||
2bcaed71 | 353 | record_insert (PT, length); |
b45433b3 JB |
354 | MODIFF++; |
355 | ||
356 | bcopy (string, GPT_ADDR, length); | |
357 | ||
648c4c55 RS |
358 | #ifdef USE_TEXT_PROPERTIES |
359 | if (current_buffer->intervals != 0) | |
360 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES. */ | |
361 | offset_intervals (current_buffer, PT, length); | |
362 | #endif | |
679194a6 | 363 | |
b45433b3 JB |
364 | GAP_SIZE -= length; |
365 | GPT += length; | |
366 | ZV += length; | |
367 | Z += length; | |
a27a38d8 | 368 | adjust_point (length); |
cd11ef31 | 369 | |
648c4c55 RS |
370 | #ifdef USE_TEXT_PROPERTIES |
371 | if (!inherit && current_buffer->intervals != 0) | |
cd11ef31 RS |
372 | Fset_text_properties (make_number (PT - length), make_number (PT), |
373 | Qnil, Qnil); | |
648c4c55 | 374 | #endif |
b45433b3 JB |
375 | } |
376 | ||
679194a6 JA |
377 | /* Insert the part of the text of STRING, a Lisp object assumed to be |
378 | of type string, consisting of the LENGTH characters starting at | |
379 | position POS. If the text of STRING has properties, they are absorbed | |
380 | into the buffer. | |
381 | ||
382 | It does not work to use `insert' for this, because a GC could happen | |
7e1ea612 JB |
383 | before we bcopy the stuff into the buffer, and relocate the string |
384 | without insert noticing. */ | |
679194a6 | 385 | |
9391e591 | 386 | insert_from_string (string, pos, length, inherit) |
b45433b3 JB |
387 | Lisp_Object string; |
388 | register int pos, length; | |
9391e591 | 389 | int inherit; |
395ec62e KH |
390 | { |
391 | if (length > 0) | |
392 | { | |
393 | insert_from_string_1 (string, pos, length, inherit); | |
2bcaed71 | 394 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
395 | } |
396 | } | |
397 | ||
398 | static void | |
399 | insert_from_string_1 (string, pos, length, inherit) | |
400 | Lisp_Object string; | |
401 | register int pos, length; | |
402 | int inherit; | |
b45433b3 JB |
403 | { |
404 | register Lisp_Object temp; | |
405 | struct gcpro gcpro1; | |
406 | ||
b45433b3 | 407 | /* Make sure point-max won't overflow after this insertion. */ |
eb7db9e6 | 408 | XSETINT (temp, length + Z); |
b45433b3 JB |
409 | if (length + Z != XINT (temp)) |
410 | error ("maximum buffer size exceeded"); | |
411 | ||
412 | GCPRO1 (string); | |
2bcaed71 | 413 | prepare_to_modify_buffer (PT, PT); |
b45433b3 | 414 | |
2bcaed71 KH |
415 | if (PT != GPT) |
416 | move_gap (PT); | |
b45433b3 JB |
417 | if (GAP_SIZE < length) |
418 | make_gap (length - GAP_SIZE); | |
419 | ||
2bcaed71 | 420 | record_insert (PT, length); |
b45433b3 JB |
421 | MODIFF++; |
422 | UNGCPRO; | |
423 | ||
424 | bcopy (XSTRING (string)->data, GPT_ADDR, length); | |
425 | ||
679194a6 | 426 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
2bcaed71 | 427 | offset_intervals (current_buffer, PT, length); |
679194a6 | 428 | |
b45433b3 JB |
429 | GAP_SIZE -= length; |
430 | GPT += length; | |
431 | ZV += length; | |
432 | Z += length; | |
679194a6 JA |
433 | |
434 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ | |
2bcaed71 | 435 | graft_intervals_into_buffer (XSTRING (string)->intervals, PT, length, |
9391e591 | 436 | current_buffer, inherit); |
679194a6 | 437 | |
a27a38d8 | 438 | adjust_point (length); |
b45433b3 JB |
439 | } |
440 | ||
441 | /* Insert the character C before point */ | |
442 | ||
443 | void | |
444 | insert_char (c) | |
445 | unsigned char c; | |
446 | { | |
447 | insert (&c, 1); | |
448 | } | |
449 | ||
450 | /* Insert the null-terminated string S before point */ | |
451 | ||
452 | void | |
453 | insert_string (s) | |
454 | char *s; | |
455 | { | |
456 | insert (s, strlen (s)); | |
457 | } | |
458 | ||
459 | /* Like `insert' except that all markers pointing at the place where | |
460 | the insertion happens are adjusted to point after it. | |
461 | Don't use this function to insert part of a Lisp string, | |
462 | since gc could happen and relocate it. */ | |
463 | ||
464 | insert_before_markers (string, length) | |
465 | unsigned char *string; | |
466 | register int length; | |
467 | { | |
395ec62e KH |
468 | if (length > 0) |
469 | { | |
2bcaed71 | 470 | register int opoint = PT; |
9ab5c9ca | 471 | insert_1 (string, length, 0); |
395ec62e | 472 | adjust_markers (opoint - 1, opoint, length); |
2bcaed71 | 473 | signal_after_change (PT-length, 0, length); |
395ec62e | 474 | } |
b45433b3 JB |
475 | } |
476 | ||
598fb6fe RS |
477 | insert_before_markers_and_inherit (string, length) |
478 | unsigned char *string; | |
479 | register int length; | |
480 | { | |
481 | if (length > 0) | |
482 | { | |
483 | register int opoint = PT; | |
484 | insert_1 (string, length, 1); | |
485 | adjust_markers (opoint - 1, opoint, length); | |
486 | signal_after_change (PT-length, 0, length); | |
487 | } | |
488 | } | |
489 | ||
b45433b3 JB |
490 | /* Insert part of a Lisp string, relocating markers after. */ |
491 | ||
9391e591 | 492 | insert_from_string_before_markers (string, pos, length, inherit) |
b45433b3 JB |
493 | Lisp_Object string; |
494 | register int pos, length; | |
9391e591 | 495 | int inherit; |
b45433b3 | 496 | { |
395ec62e KH |
497 | if (length > 0) |
498 | { | |
2bcaed71 | 499 | register int opoint = PT; |
395ec62e KH |
500 | insert_from_string_1 (string, pos, length, inherit); |
501 | adjust_markers (opoint - 1, opoint, length); | |
2bcaed71 | 502 | signal_after_change (PT-length, 0, length); |
395ec62e | 503 | } |
b45433b3 JB |
504 | } |
505 | \f | |
506 | /* Delete characters in current buffer | |
507 | from FROM up to (but not including) TO. */ | |
508 | ||
509 | del_range (from, to) | |
510 | register int from, to; | |
47c64747 RS |
511 | { |
512 | return del_range_1 (from, to, 1); | |
513 | } | |
514 | ||
515 | /* Like del_range; PREPARE says whether to call prepare_to_modify_buffer. */ | |
516 | ||
517 | del_range_1 (from, to, prepare) | |
518 | register int from, to, prepare; | |
b45433b3 JB |
519 | { |
520 | register int numdel; | |
521 | ||
522 | /* Make args be valid */ | |
523 | if (from < BEGV) | |
524 | from = BEGV; | |
525 | if (to > ZV) | |
526 | to = ZV; | |
527 | ||
528 | if ((numdel = to - from) <= 0) | |
529 | return; | |
530 | ||
531 | /* Make sure the gap is somewhere in or next to what we are deleting. */ | |
532 | if (from > GPT) | |
533 | gap_right (from); | |
534 | if (to < GPT) | |
535 | gap_left (to, 0); | |
536 | ||
47c64747 RS |
537 | if (prepare) |
538 | prepare_to_modify_buffer (from, to); | |
b45433b3 | 539 | |
be09561e RS |
540 | record_delete (from, numdel); |
541 | MODIFF++; | |
542 | ||
b45433b3 | 543 | /* Relocate point as if it were a marker. */ |
2bcaed71 | 544 | if (from < PT) |
a27a38d8 | 545 | adjust_point (from - (PT < to ? PT : to)); |
b45433b3 | 546 | |
16032db6 | 547 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
83010cd6 | 548 | offset_intervals (current_buffer, from, - numdel); |
16032db6 | 549 | |
b45433b3 JB |
550 | /* Relocate all markers pointing into the new, larger gap |
551 | to point at the end of the text before the gap. */ | |
552 | adjust_markers (to + GAP_SIZE, to + GAP_SIZE, - numdel - GAP_SIZE); | |
553 | ||
554 | GAP_SIZE += numdel; | |
555 | ZV -= numdel; | |
556 | Z -= numdel; | |
557 | GPT = from; | |
558 | ||
559 | if (GPT - BEG < beg_unchanged) | |
560 | beg_unchanged = GPT - BEG; | |
561 | if (Z - GPT < end_unchanged) | |
562 | end_unchanged = Z - GPT; | |
563 | ||
d386034e | 564 | evaporate_overlays (from); |
b45433b3 JB |
565 | signal_after_change (from, numdel, 0); |
566 | } | |
567 | \f | |
04a759c8 JB |
568 | /* Call this if you're about to change the region of BUFFER from START |
569 | to END. This checks the read-only properties of the region, calls | |
570 | the necessary modification hooks, and warns the next redisplay that | |
571 | it should pay attention to that area. */ | |
572 | modify_region (buffer, start, end) | |
573 | struct buffer *buffer; | |
b45433b3 JB |
574 | int start, end; |
575 | { | |
04a759c8 JB |
576 | struct buffer *old_buffer = current_buffer; |
577 | ||
578 | if (buffer != old_buffer) | |
579 | set_buffer_internal (buffer); | |
580 | ||
b45433b3 JB |
581 | prepare_to_modify_buffer (start, end); |
582 | ||
583 | if (start - 1 < beg_unchanged || unchanged_modified == MODIFF) | |
584 | beg_unchanged = start - 1; | |
585 | if (Z - end < end_unchanged | |
586 | || unchanged_modified == MODIFF) | |
587 | end_unchanged = Z - end; | |
83010cd6 RS |
588 | |
589 | if (MODIFF <= current_buffer->save_modified) | |
590 | record_first_change (); | |
b45433b3 | 591 | MODIFF++; |
04a759c8 JB |
592 | |
593 | if (buffer != old_buffer) | |
594 | set_buffer_internal (old_buffer); | |
b45433b3 JB |
595 | } |
596 | ||
597 | /* Check that it is okay to modify the buffer between START and END. | |
679194a6 JA |
598 | Run the before-change-function, if any. If intervals are in use, |
599 | verify that the text to be modified is not read-only, and call | |
600 | any modification properties the text may have. */ | |
b45433b3 JB |
601 | |
602 | prepare_to_modify_buffer (start, end) | |
603 | Lisp_Object start, end; | |
604 | { | |
d427b66a | 605 | if (!NILP (current_buffer->read_only)) |
b45433b3 JB |
606 | Fbarf_if_buffer_read_only (); |
607 | ||
679194a6 | 608 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
648c4c55 RS |
609 | if (current_buffer->intervals != 0) |
610 | verify_interval_modification (current_buffer, start, end); | |
b45433b3 | 611 | |
648c4c55 RS |
612 | if (!NILP (current_buffer->overlays_before) |
613 | || !NILP (current_buffer->overlays_after)) | |
614 | verify_overlay_modification (start, end); | |
f256353c | 615 | |
b45433b3 | 616 | #ifdef CLASH_DETECTION |
d427b66a | 617 | if (!NILP (current_buffer->filename) |
b45433b3 JB |
618 | && current_buffer->save_modified >= MODIFF) |
619 | lock_file (current_buffer->filename); | |
620 | #else | |
621 | /* At least warn if this file has changed on disk since it was visited. */ | |
d427b66a | 622 | if (!NILP (current_buffer->filename) |
b45433b3 | 623 | && current_buffer->save_modified >= MODIFF |
d427b66a JB |
624 | && NILP (Fverify_visited_file_modtime (Fcurrent_buffer ())) |
625 | && !NILP (Ffile_exists_p (current_buffer->filename))) | |
b45433b3 JB |
626 | call1 (intern ("ask-user-about-supersession-threat"), |
627 | current_buffer->filename); | |
628 | #endif /* not CLASH_DETECTION */ | |
629 | ||
630 | signal_before_change (start, end); | |
2f545eea | 631 | |
56e1065e JB |
632 | if (current_buffer->newline_cache) |
633 | invalidate_region_cache (current_buffer, | |
634 | current_buffer->newline_cache, | |
635 | start - BEG, Z - end); | |
636 | if (current_buffer->width_run_cache) | |
637 | invalidate_region_cache (current_buffer, | |
638 | current_buffer->width_run_cache, | |
639 | start - BEG, Z - end); | |
640 | ||
2f545eea | 641 | Vdeactivate_mark = Qt; |
b45433b3 JB |
642 | } |
643 | \f | |
644 | static Lisp_Object | |
645 | before_change_function_restore (value) | |
646 | Lisp_Object value; | |
647 | { | |
648 | Vbefore_change_function = value; | |
649 | } | |
650 | ||
651 | static Lisp_Object | |
652 | after_change_function_restore (value) | |
653 | Lisp_Object value; | |
654 | { | |
655 | Vafter_change_function = value; | |
656 | } | |
657 | ||
e45fb8bf RS |
658 | static Lisp_Object |
659 | before_change_functions_restore (value) | |
660 | Lisp_Object value; | |
661 | { | |
662 | Vbefore_change_functions = value; | |
663 | } | |
664 | ||
665 | static Lisp_Object | |
666 | after_change_functions_restore (value) | |
667 | Lisp_Object value; | |
668 | { | |
669 | Vafter_change_functions = value; | |
670 | } | |
671 | ||
eb8c3be9 | 672 | /* Signal a change to the buffer immediately before it happens. |
b45433b3 JB |
673 | START and END are the bounds of the text to be changed, |
674 | as Lisp objects. */ | |
675 | ||
676 | signal_before_change (start, end) | |
677 | Lisp_Object start, end; | |
678 | { | |
679 | /* If buffer is unmodified, run a special hook for that case. */ | |
680 | if (current_buffer->save_modified >= MODIFF | |
dbc4e1c1 JB |
681 | && !NILP (Vfirst_change_hook) |
682 | && !NILP (Vrun_hooks)) | |
683 | call1 (Vrun_hooks, Qfirst_change_hook); | |
684 | ||
b45433b3 | 685 | /* Now in any case run the before-change-function if any. */ |
d427b66a | 686 | if (!NILP (Vbefore_change_function)) |
b45433b3 JB |
687 | { |
688 | int count = specpdl_ptr - specpdl; | |
689 | Lisp_Object function; | |
690 | ||
691 | function = Vbefore_change_function; | |
e45fb8bf | 692 | |
b45433b3 JB |
693 | record_unwind_protect (after_change_function_restore, |
694 | Vafter_change_function); | |
695 | record_unwind_protect (before_change_function_restore, | |
696 | Vbefore_change_function); | |
e45fb8bf RS |
697 | record_unwind_protect (after_change_functions_restore, |
698 | Vafter_change_functions); | |
699 | record_unwind_protect (before_change_functions_restore, | |
700 | Vbefore_change_functions); | |
b45433b3 JB |
701 | Vafter_change_function = Qnil; |
702 | Vbefore_change_function = Qnil; | |
e45fb8bf RS |
703 | Vafter_change_functions = Qnil; |
704 | Vbefore_change_functions = Qnil; | |
b45433b3 JB |
705 | |
706 | call2 (function, start, end); | |
707 | unbind_to (count, Qnil); | |
708 | } | |
e45fb8bf RS |
709 | |
710 | /* Now in any case run the before-change-function if any. */ | |
711 | if (!NILP (Vbefore_change_functions)) | |
712 | { | |
713 | int count = specpdl_ptr - specpdl; | |
714 | Lisp_Object functions; | |
715 | ||
716 | functions = Vbefore_change_functions; | |
717 | ||
718 | record_unwind_protect (after_change_function_restore, | |
719 | Vafter_change_function); | |
720 | record_unwind_protect (before_change_function_restore, | |
721 | Vbefore_change_function); | |
722 | record_unwind_protect (after_change_functions_restore, | |
723 | Vafter_change_functions); | |
724 | record_unwind_protect (before_change_functions_restore, | |
725 | Vbefore_change_functions); | |
726 | Vafter_change_function = Qnil; | |
727 | Vbefore_change_function = Qnil; | |
728 | Vafter_change_functions = Qnil; | |
729 | Vbefore_change_functions = Qnil; | |
730 | ||
731 | while (CONSP (functions)) | |
732 | { | |
733 | call2 (XCONS (functions)->car, start, end); | |
734 | functions = XCONS (functions)->cdr; | |
735 | } | |
736 | unbind_to (count, Qnil); | |
737 | } | |
b45433b3 JB |
738 | } |
739 | ||
eb8c3be9 | 740 | /* Signal a change immediately after it happens. |
b45433b3 JB |
741 | POS is the address of the start of the changed text. |
742 | LENDEL is the number of characters of the text before the change. | |
743 | (Not the whole buffer; just the part that was changed.) | |
744 | LENINS is the number of characters in the changed text. */ | |
745 | ||
746 | signal_after_change (pos, lendel, lenins) | |
747 | int pos, lendel, lenins; | |
748 | { | |
d427b66a | 749 | if (!NILP (Vafter_change_function)) |
b45433b3 JB |
750 | { |
751 | int count = specpdl_ptr - specpdl; | |
752 | Lisp_Object function; | |
753 | function = Vafter_change_function; | |
754 | ||
755 | record_unwind_protect (after_change_function_restore, | |
756 | Vafter_change_function); | |
757 | record_unwind_protect (before_change_function_restore, | |
758 | Vbefore_change_function); | |
e45fb8bf RS |
759 | record_unwind_protect (after_change_functions_restore, |
760 | Vafter_change_functions); | |
761 | record_unwind_protect (before_change_functions_restore, | |
762 | Vbefore_change_functions); | |
b45433b3 JB |
763 | Vafter_change_function = Qnil; |
764 | Vbefore_change_function = Qnil; | |
e45fb8bf RS |
765 | Vafter_change_functions = Qnil; |
766 | Vbefore_change_functions = Qnil; | |
b45433b3 JB |
767 | |
768 | call3 (function, make_number (pos), make_number (pos + lenins), | |
769 | make_number (lendel)); | |
770 | unbind_to (count, Qnil); | |
771 | } | |
e45fb8bf RS |
772 | if (!NILP (Vafter_change_functions)) |
773 | { | |
774 | int count = specpdl_ptr - specpdl; | |
775 | Lisp_Object functions; | |
776 | functions = Vafter_change_functions; | |
777 | ||
778 | record_unwind_protect (after_change_function_restore, | |
779 | Vafter_change_function); | |
780 | record_unwind_protect (before_change_function_restore, | |
781 | Vbefore_change_function); | |
782 | record_unwind_protect (after_change_functions_restore, | |
783 | Vafter_change_functions); | |
784 | record_unwind_protect (before_change_functions_restore, | |
785 | Vbefore_change_functions); | |
786 | Vafter_change_function = Qnil; | |
787 | Vbefore_change_function = Qnil; | |
788 | Vafter_change_functions = Qnil; | |
789 | Vbefore_change_functions = Qnil; | |
790 | ||
791 | while (CONSP (functions)) | |
792 | { | |
793 | call3 (XCONS (functions)->car, | |
794 | make_number (pos), make_number (pos + lenins), | |
795 | make_number (lendel)); | |
796 | functions = XCONS (functions)->cdr; | |
797 | } | |
798 | unbind_to (count, Qnil); | |
799 | } | |
b45433b3 | 800 | } |