Commit | Line | Data |
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b45433b3 | 1 | /* Buffer insertion/deletion and gap motion for GNU Emacs. |
f8c25f1b | 2 | Copyright (C) 1985, 1986, 1993, 1994, 1995 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 | 28 | static void insert_from_string_1 (); |
ef29f213 | 29 | static void insert_from_buffer_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 | ||
c660b094 | 38 | void |
b45433b3 JB |
39 | move_gap (pos) |
40 | int pos; | |
41 | { | |
42 | if (pos < GPT) | |
43 | gap_left (pos, 0); | |
44 | else if (pos > GPT) | |
45 | gap_right (pos); | |
46 | } | |
47 | ||
48 | /* Move the gap to POS, which is less than the current GPT. | |
49 | If NEWGAP is nonzero, then don't update beg_unchanged and end_unchanged. */ | |
50 | ||
2bcaed71 | 51 | static void |
b45433b3 JB |
52 | gap_left (pos, newgap) |
53 | register int pos; | |
54 | int newgap; | |
55 | { | |
56 | register unsigned char *to, *from; | |
57 | register int i; | |
58 | int new_s1; | |
59 | ||
60 | pos--; | |
61 | ||
62 | if (!newgap) | |
63 | { | |
64 | if (unchanged_modified == MODIFF) | |
65 | { | |
66 | beg_unchanged = pos; | |
67 | end_unchanged = Z - pos - 1; | |
68 | } | |
69 | else | |
70 | { | |
71 | if (Z - GPT < end_unchanged) | |
72 | end_unchanged = Z - GPT; | |
73 | if (pos < beg_unchanged) | |
74 | beg_unchanged = pos; | |
75 | } | |
76 | } | |
77 | ||
78 | i = GPT; | |
79 | to = GAP_END_ADDR; | |
80 | from = GPT_ADDR; | |
81 | new_s1 = GPT - BEG; | |
82 | ||
83 | /* Now copy the characters. To move the gap down, | |
84 | copy characters up. */ | |
85 | ||
86 | while (1) | |
87 | { | |
88 | /* I gets number of characters left to copy. */ | |
89 | i = new_s1 - pos; | |
90 | if (i == 0) | |
91 | break; | |
92 | /* If a quit is requested, stop copying now. | |
93 | Change POS to be where we have actually moved the gap to. */ | |
94 | if (QUITP) | |
95 | { | |
96 | pos = new_s1; | |
97 | break; | |
98 | } | |
99 | /* Move at most 32000 chars before checking again for a quit. */ | |
100 | if (i > 32000) | |
101 | i = 32000; | |
102 | #ifdef GAP_USE_BCOPY | |
103 | if (i >= 128 | |
104 | /* bcopy is safe if the two areas of memory do not overlap | |
105 | or on systems where bcopy is always safe for moving upward. */ | |
106 | && (BCOPY_UPWARD_SAFE | |
107 | || to - from >= 128)) | |
108 | { | |
109 | /* If overlap is not safe, avoid it by not moving too many | |
110 | characters at once. */ | |
111 | if (!BCOPY_UPWARD_SAFE && i > to - from) | |
112 | i = to - from; | |
113 | new_s1 -= i; | |
114 | from -= i, to -= i; | |
115 | bcopy (from, to, i); | |
116 | } | |
117 | else | |
118 | #endif | |
119 | { | |
120 | new_s1 -= i; | |
121 | while (--i >= 0) | |
122 | *--to = *--from; | |
123 | } | |
124 | } | |
125 | ||
126 | /* Adjust markers, and buffer data structure, to put the gap at POS. | |
127 | POS is where the loop above stopped, which may be what was specified | |
128 | or may be where a quit was detected. */ | |
129 | adjust_markers (pos + 1, GPT, GAP_SIZE); | |
130 | GPT = pos + 1; | |
131 | QUIT; | |
132 | } | |
133 | ||
2bcaed71 | 134 | static void |
b45433b3 JB |
135 | gap_right (pos) |
136 | register int pos; | |
137 | { | |
138 | register unsigned char *to, *from; | |
139 | register int i; | |
140 | int new_s1; | |
141 | ||
142 | pos--; | |
143 | ||
144 | if (unchanged_modified == MODIFF) | |
145 | { | |
146 | beg_unchanged = pos; | |
147 | end_unchanged = Z - pos - 1; | |
148 | } | |
149 | else | |
150 | { | |
151 | if (Z - pos - 1 < end_unchanged) | |
152 | end_unchanged = Z - pos - 1; | |
153 | if (GPT - BEG < beg_unchanged) | |
154 | beg_unchanged = GPT - BEG; | |
155 | } | |
156 | ||
157 | i = GPT; | |
158 | from = GAP_END_ADDR; | |
159 | to = GPT_ADDR; | |
160 | new_s1 = GPT - 1; | |
161 | ||
162 | /* Now copy the characters. To move the gap up, | |
163 | copy characters down. */ | |
164 | ||
165 | while (1) | |
166 | { | |
167 | /* I gets number of characters left to copy. */ | |
168 | i = pos - new_s1; | |
169 | if (i == 0) | |
170 | break; | |
171 | /* If a quit is requested, stop copying now. | |
172 | Change POS to be where we have actually moved the gap to. */ | |
173 | if (QUITP) | |
174 | { | |
175 | pos = new_s1; | |
176 | break; | |
177 | } | |
178 | /* Move at most 32000 chars before checking again for a quit. */ | |
179 | if (i > 32000) | |
180 | i = 32000; | |
181 | #ifdef GAP_USE_BCOPY | |
182 | if (i >= 128 | |
183 | /* bcopy is safe if the two areas of memory do not overlap | |
184 | or on systems where bcopy is always safe for moving downward. */ | |
185 | && (BCOPY_DOWNWARD_SAFE | |
186 | || from - to >= 128)) | |
187 | { | |
188 | /* If overlap is not safe, avoid it by not moving too many | |
189 | characters at once. */ | |
190 | if (!BCOPY_DOWNWARD_SAFE && i > from - to) | |
191 | i = from - to; | |
192 | new_s1 += i; | |
193 | bcopy (from, to, i); | |
194 | from += i, to += i; | |
195 | } | |
196 | else | |
197 | #endif | |
198 | { | |
199 | new_s1 += i; | |
200 | while (--i >= 0) | |
201 | *to++ = *from++; | |
202 | } | |
203 | } | |
204 | ||
205 | adjust_markers (GPT + GAP_SIZE, pos + 1 + GAP_SIZE, - GAP_SIZE); | |
206 | GPT = pos + 1; | |
207 | QUIT; | |
208 | } | |
209 | ||
210 | /* Add `amount' to the position of every marker in the current buffer | |
211 | whose current position is between `from' (exclusive) and `to' (inclusive). | |
212 | Also, any markers past the outside of that interval, in the direction | |
213 | of adjustment, are first moved back to the near end of the interval | |
214 | and then adjusted by `amount'. */ | |
215 | ||
2bcaed71 | 216 | static void |
b45433b3 JB |
217 | adjust_markers (from, to, amount) |
218 | register int from, to, amount; | |
219 | { | |
220 | Lisp_Object marker; | |
221 | register struct Lisp_Marker *m; | |
222 | register int mpos; | |
223 | ||
9fbf87cd | 224 | marker = BUF_MARKERS (current_buffer); |
b45433b3 | 225 | |
d427b66a | 226 | while (!NILP (marker)) |
b45433b3 JB |
227 | { |
228 | m = XMARKER (marker); | |
229 | mpos = m->bufpos; | |
230 | if (amount > 0) | |
231 | { | |
232 | if (mpos > to && mpos < to + amount) | |
233 | mpos = to + amount; | |
234 | } | |
235 | else | |
236 | { | |
237 | if (mpos > from + amount && mpos <= from) | |
238 | mpos = from + amount; | |
239 | } | |
240 | if (mpos > from && mpos <= to) | |
241 | mpos += amount; | |
242 | m->bufpos = mpos; | |
243 | marker = m->chain; | |
244 | } | |
245 | } | |
a27a38d8 KH |
246 | |
247 | /* Add the specified amount to point. This is used only when the value | |
248 | of point changes due to an insert or delete; it does not represent | |
249 | a conceptual change in point as a marker. In particular, point is | |
250 | not crossing any interval boundaries, so there's no need to use the | |
251 | usual SET_PT macro. In fact it would be incorrect to do so, because | |
252 | either the old or the new value of point is out of synch with the | |
253 | current set of intervals. */ | |
254 | static void | |
255 | adjust_point (amount) | |
256 | { | |
9fbf87cd | 257 | BUF_PT (current_buffer) += amount; |
a27a38d8 | 258 | } |
b45433b3 JB |
259 | \f |
260 | /* Make the gap INCREMENT characters longer. */ | |
261 | ||
c660b094 | 262 | void |
b45433b3 JB |
263 | make_gap (increment) |
264 | int increment; | |
265 | { | |
266 | unsigned char *result; | |
267 | Lisp_Object tem; | |
268 | int real_gap_loc; | |
269 | int old_gap_size; | |
270 | ||
271 | /* If we have to get more space, get enough to last a while. */ | |
272 | increment += 2000; | |
273 | ||
9ac0d9e0 | 274 | BLOCK_INPUT; |
b45433b3 | 275 | result = BUFFER_REALLOC (BEG_ADDR, (Z - BEG + GAP_SIZE + increment)); |
9ac0d9e0 | 276 | |
b45433b3 | 277 | if (result == 0) |
270c2138 RS |
278 | { |
279 | UNBLOCK_INPUT; | |
280 | memory_full (); | |
281 | } | |
282 | ||
283 | /* We can't unblock until the new address is properly stored. */ | |
b45433b3 | 284 | BEG_ADDR = result; |
270c2138 | 285 | UNBLOCK_INPUT; |
b45433b3 JB |
286 | |
287 | /* Prevent quitting in move_gap. */ | |
288 | tem = Vinhibit_quit; | |
289 | Vinhibit_quit = Qt; | |
290 | ||
291 | real_gap_loc = GPT; | |
292 | old_gap_size = GAP_SIZE; | |
293 | ||
294 | /* Call the newly allocated space a gap at the end of the whole space. */ | |
295 | GPT = Z + GAP_SIZE; | |
296 | GAP_SIZE = increment; | |
297 | ||
298 | /* Move the new gap down to be consecutive with the end of the old one. | |
299 | This adjusts the markers properly too. */ | |
300 | gap_left (real_gap_loc + old_gap_size, 1); | |
301 | ||
302 | /* Now combine the two into one large gap. */ | |
303 | GAP_SIZE += old_gap_size; | |
304 | GPT = real_gap_loc; | |
305 | ||
306 | Vinhibit_quit = tem; | |
307 | } | |
308 | \f | |
309 | /* Insert a string of specified length before point. | |
ef29f213 KH |
310 | DO NOT use this for the contents of a Lisp string or a Lisp buffer! |
311 | prepare_to_modify_buffer could relocate the text. */ | |
b45433b3 | 312 | |
c660b094 | 313 | void |
b45433b3 JB |
314 | insert (string, length) |
315 | register unsigned char *string; | |
316 | register length; | |
317 | { | |
395ec62e KH |
318 | if (length > 0) |
319 | { | |
c660b094 | 320 | insert_1 (string, length, 0, 1); |
cd11ef31 RS |
321 | signal_after_change (PT-length, 0, length); |
322 | } | |
323 | } | |
324 | ||
c660b094 | 325 | void |
cd11ef31 RS |
326 | insert_and_inherit (string, length) |
327 | register unsigned char *string; | |
328 | register length; | |
329 | { | |
330 | if (length > 0) | |
331 | { | |
c660b094 | 332 | insert_1 (string, length, 1, 1); |
2bcaed71 | 333 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
334 | } |
335 | } | |
b45433b3 | 336 | |
c660b094 KH |
337 | void |
338 | insert_1 (string, length, inherit, prepare) | |
395ec62e | 339 | register unsigned char *string; |
c660b094 KH |
340 | register int length; |
341 | int inherit, prepare; | |
395ec62e KH |
342 | { |
343 | register Lisp_Object temp; | |
b45433b3 JB |
344 | |
345 | /* Make sure point-max won't overflow after this insertion. */ | |
eb7db9e6 | 346 | XSETINT (temp, length + Z); |
b45433b3 JB |
347 | if (length + Z != XINT (temp)) |
348 | error ("maximum buffer size exceeded"); | |
349 | ||
c660b094 KH |
350 | if (prepare) |
351 | prepare_to_modify_buffer (PT, PT); | |
b45433b3 | 352 | |
2bcaed71 KH |
353 | if (PT != GPT) |
354 | move_gap (PT); | |
b45433b3 JB |
355 | if (GAP_SIZE < length) |
356 | make_gap (length - GAP_SIZE); | |
357 | ||
2bcaed71 | 358 | record_insert (PT, length); |
b45433b3 JB |
359 | MODIFF++; |
360 | ||
361 | bcopy (string, GPT_ADDR, length); | |
362 | ||
648c4c55 | 363 | #ifdef USE_TEXT_PROPERTIES |
9fbf87cd | 364 | if (BUF_INTERVALS (current_buffer) != 0) |
648c4c55 RS |
365 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES. */ |
366 | offset_intervals (current_buffer, PT, length); | |
367 | #endif | |
679194a6 | 368 | |
b45433b3 JB |
369 | GAP_SIZE -= length; |
370 | GPT += length; | |
371 | ZV += length; | |
372 | Z += length; | |
adde4858 | 373 | adjust_overlays_for_insert (PT, length); |
a27a38d8 | 374 | adjust_point (length); |
cd11ef31 | 375 | |
648c4c55 | 376 | #ifdef USE_TEXT_PROPERTIES |
9fbf87cd | 377 | if (!inherit && BUF_INTERVALS (current_buffer) != 0) |
cd11ef31 RS |
378 | Fset_text_properties (make_number (PT - length), make_number (PT), |
379 | Qnil, Qnil); | |
648c4c55 | 380 | #endif |
b45433b3 JB |
381 | } |
382 | ||
679194a6 JA |
383 | /* Insert the part of the text of STRING, a Lisp object assumed to be |
384 | of type string, consisting of the LENGTH characters starting at | |
385 | position POS. If the text of STRING has properties, they are absorbed | |
386 | into the buffer. | |
387 | ||
388 | It does not work to use `insert' for this, because a GC could happen | |
7e1ea612 JB |
389 | before we bcopy the stuff into the buffer, and relocate the string |
390 | without insert noticing. */ | |
679194a6 | 391 | |
c660b094 | 392 | void |
9391e591 | 393 | insert_from_string (string, pos, length, inherit) |
b45433b3 JB |
394 | Lisp_Object string; |
395 | register int pos, length; | |
9391e591 | 396 | int inherit; |
395ec62e KH |
397 | { |
398 | if (length > 0) | |
399 | { | |
400 | insert_from_string_1 (string, pos, length, inherit); | |
2bcaed71 | 401 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
402 | } |
403 | } | |
404 | ||
405 | static void | |
406 | insert_from_string_1 (string, pos, length, inherit) | |
407 | Lisp_Object string; | |
408 | register int pos, length; | |
409 | int inherit; | |
b45433b3 JB |
410 | { |
411 | register Lisp_Object temp; | |
412 | struct gcpro gcpro1; | |
413 | ||
b45433b3 | 414 | /* Make sure point-max won't overflow after this insertion. */ |
eb7db9e6 | 415 | XSETINT (temp, length + Z); |
b45433b3 JB |
416 | if (length + Z != XINT (temp)) |
417 | error ("maximum buffer size exceeded"); | |
418 | ||
419 | GCPRO1 (string); | |
2bcaed71 | 420 | prepare_to_modify_buffer (PT, PT); |
b45433b3 | 421 | |
2bcaed71 KH |
422 | if (PT != GPT) |
423 | move_gap (PT); | |
b45433b3 JB |
424 | if (GAP_SIZE < length) |
425 | make_gap (length - GAP_SIZE); | |
426 | ||
2bcaed71 | 427 | record_insert (PT, length); |
b45433b3 JB |
428 | MODIFF++; |
429 | UNGCPRO; | |
430 | ||
431 | bcopy (XSTRING (string)->data, GPT_ADDR, length); | |
432 | ||
679194a6 | 433 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
2bcaed71 | 434 | offset_intervals (current_buffer, PT, length); |
679194a6 | 435 | |
b45433b3 JB |
436 | GAP_SIZE -= length; |
437 | GPT += length; | |
438 | ZV += length; | |
439 | Z += length; | |
adde4858 | 440 | adjust_overlays_for_insert (PT, length); |
679194a6 JA |
441 | |
442 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ | |
2bcaed71 | 443 | graft_intervals_into_buffer (XSTRING (string)->intervals, PT, length, |
9391e591 | 444 | current_buffer, inherit); |
679194a6 | 445 | |
a27a38d8 | 446 | adjust_point (length); |
b45433b3 JB |
447 | } |
448 | ||
ef29f213 KH |
449 | /* Insert text from BUF, starting at POS and having length LENGTH, into the |
450 | current buffer. If the text in BUF has properties, they are absorbed | |
451 | into the current buffer. | |
452 | ||
453 | It does not work to use `insert' for this, because a malloc could happen | |
454 | and relocate BUF's text before the bcopy happens. */ | |
455 | ||
456 | void | |
457 | insert_from_buffer (buf, pos, length, inherit) | |
458 | struct buffer *buf; | |
459 | int pos, length; | |
460 | int inherit; | |
461 | { | |
462 | if (length > 0) | |
463 | { | |
464 | insert_from_buffer_1 (buf, pos, length, inherit); | |
465 | signal_after_change (PT-length, 0, length); | |
466 | } | |
467 | } | |
468 | ||
469 | static void | |
470 | insert_from_buffer_1 (buf, pos, length, inherit) | |
471 | struct buffer *buf; | |
472 | int pos, length; | |
473 | int inherit; | |
474 | { | |
475 | register Lisp_Object temp; | |
476 | int chunk; | |
477 | ||
478 | /* Make sure point-max won't overflow after this insertion. */ | |
479 | XSETINT (temp, length + Z); | |
480 | if (length + Z != XINT (temp)) | |
481 | error ("maximum buffer size exceeded"); | |
482 | ||
483 | prepare_to_modify_buffer (PT, PT); | |
484 | ||
485 | if (PT != GPT) | |
486 | move_gap (PT); | |
487 | if (GAP_SIZE < length) | |
488 | make_gap (length - GAP_SIZE); | |
489 | ||
490 | record_insert (PT, length); | |
491 | MODIFF++; | |
492 | ||
493 | if (pos < BUF_GPT (buf)) | |
494 | { | |
61bd0e9c RS |
495 | chunk = BUF_GPT (buf) - pos; |
496 | if (chunk > length) | |
497 | chunk = length; | |
ef29f213 KH |
498 | bcopy (BUF_CHAR_ADDRESS (buf, pos), GPT_ADDR, chunk); |
499 | } | |
500 | else | |
501 | chunk = 0; | |
502 | if (chunk < length) | |
503 | bcopy (BUF_CHAR_ADDRESS (buf, pos + chunk), | |
504 | GPT_ADDR + chunk, length - chunk); | |
505 | ||
506 | #ifdef USE_TEXT_PROPERTIES | |
9fbf87cd | 507 | if (BUF_INTERVALS (current_buffer) != 0) |
ef29f213 KH |
508 | offset_intervals (current_buffer, PT, length); |
509 | #endif | |
510 | ||
511 | GAP_SIZE -= length; | |
512 | GPT += length; | |
513 | ZV += length; | |
514 | Z += length; | |
adde4858 | 515 | adjust_overlays_for_insert (PT, length); |
ef29f213 KH |
516 | adjust_point (length); |
517 | ||
518 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ | |
9fbf87cd RS |
519 | graft_intervals_into_buffer (copy_intervals (BUF_INTERVALS (buf), |
520 | pos, length), | |
ef29f213 KH |
521 | PT - length, length, current_buffer, inherit); |
522 | } | |
523 | ||
b45433b3 JB |
524 | /* Insert the character C before point */ |
525 | ||
526 | void | |
527 | insert_char (c) | |
528 | unsigned char c; | |
529 | { | |
530 | insert (&c, 1); | |
531 | } | |
532 | ||
533 | /* Insert the null-terminated string S before point */ | |
534 | ||
535 | void | |
536 | insert_string (s) | |
537 | char *s; | |
538 | { | |
539 | insert (s, strlen (s)); | |
540 | } | |
541 | ||
542 | /* Like `insert' except that all markers pointing at the place where | |
543 | the insertion happens are adjusted to point after it. | |
544 | Don't use this function to insert part of a Lisp string, | |
545 | since gc could happen and relocate it. */ | |
546 | ||
c660b094 | 547 | void |
b45433b3 JB |
548 | insert_before_markers (string, length) |
549 | unsigned char *string; | |
550 | register int length; | |
551 | { | |
395ec62e KH |
552 | if (length > 0) |
553 | { | |
2bcaed71 | 554 | register int opoint = PT; |
c660b094 | 555 | insert_1 (string, length, 0, 1); |
395ec62e | 556 | adjust_markers (opoint - 1, opoint, length); |
2bcaed71 | 557 | signal_after_change (PT-length, 0, length); |
395ec62e | 558 | } |
b45433b3 JB |
559 | } |
560 | ||
c660b094 | 561 | void |
598fb6fe RS |
562 | insert_before_markers_and_inherit (string, length) |
563 | unsigned char *string; | |
564 | register int length; | |
565 | { | |
566 | if (length > 0) | |
567 | { | |
568 | register int opoint = PT; | |
c660b094 | 569 | insert_1 (string, length, 1, 1); |
598fb6fe RS |
570 | adjust_markers (opoint - 1, opoint, length); |
571 | signal_after_change (PT-length, 0, length); | |
572 | } | |
573 | } | |
574 | ||
b45433b3 JB |
575 | /* Insert part of a Lisp string, relocating markers after. */ |
576 | ||
c660b094 | 577 | void |
9391e591 | 578 | insert_from_string_before_markers (string, pos, length, inherit) |
b45433b3 JB |
579 | Lisp_Object string; |
580 | register int pos, length; | |
9391e591 | 581 | int inherit; |
b45433b3 | 582 | { |
395ec62e KH |
583 | if (length > 0) |
584 | { | |
2bcaed71 | 585 | register int opoint = PT; |
395ec62e KH |
586 | insert_from_string_1 (string, pos, length, inherit); |
587 | adjust_markers (opoint - 1, opoint, length); | |
2bcaed71 | 588 | signal_after_change (PT-length, 0, length); |
395ec62e | 589 | } |
b45433b3 JB |
590 | } |
591 | \f | |
592 | /* Delete characters in current buffer | |
593 | from FROM up to (but not including) TO. */ | |
594 | ||
c660b094 | 595 | void |
b45433b3 JB |
596 | del_range (from, to) |
597 | register int from, to; | |
47c64747 | 598 | { |
c660b094 | 599 | del_range_1 (from, to, 1); |
47c64747 RS |
600 | } |
601 | ||
602 | /* Like del_range; PREPARE says whether to call prepare_to_modify_buffer. */ | |
603 | ||
c660b094 | 604 | void |
47c64747 RS |
605 | del_range_1 (from, to, prepare) |
606 | register int from, to, prepare; | |
b45433b3 JB |
607 | { |
608 | register int numdel; | |
609 | ||
610 | /* Make args be valid */ | |
611 | if (from < BEGV) | |
612 | from = BEGV; | |
613 | if (to > ZV) | |
614 | to = ZV; | |
615 | ||
616 | if ((numdel = to - from) <= 0) | |
617 | return; | |
618 | ||
619 | /* Make sure the gap is somewhere in or next to what we are deleting. */ | |
620 | if (from > GPT) | |
621 | gap_right (from); | |
622 | if (to < GPT) | |
623 | gap_left (to, 0); | |
624 | ||
47c64747 RS |
625 | if (prepare) |
626 | prepare_to_modify_buffer (from, to); | |
b45433b3 | 627 | |
be09561e RS |
628 | record_delete (from, numdel); |
629 | MODIFF++; | |
630 | ||
b45433b3 | 631 | /* Relocate point as if it were a marker. */ |
2bcaed71 | 632 | if (from < PT) |
a27a38d8 | 633 | adjust_point (from - (PT < to ? PT : to)); |
b45433b3 | 634 | |
16032db6 | 635 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
83010cd6 | 636 | offset_intervals (current_buffer, from, - numdel); |
16032db6 | 637 | |
b45433b3 JB |
638 | /* Relocate all markers pointing into the new, larger gap |
639 | to point at the end of the text before the gap. */ | |
640 | adjust_markers (to + GAP_SIZE, to + GAP_SIZE, - numdel - GAP_SIZE); | |
641 | ||
adde4858 KH |
642 | /* Adjust the overlay center as needed. This must be done after |
643 | adjusting the markers that bound the overlays. */ | |
644 | adjust_overlays_for_delete (from, numdel); | |
645 | ||
b45433b3 JB |
646 | GAP_SIZE += numdel; |
647 | ZV -= numdel; | |
648 | Z -= numdel; | |
649 | GPT = from; | |
650 | ||
651 | if (GPT - BEG < beg_unchanged) | |
652 | beg_unchanged = GPT - BEG; | |
653 | if (Z - GPT < end_unchanged) | |
654 | end_unchanged = Z - GPT; | |
655 | ||
d386034e | 656 | evaporate_overlays (from); |
b45433b3 JB |
657 | signal_after_change (from, numdel, 0); |
658 | } | |
659 | \f | |
04a759c8 JB |
660 | /* Call this if you're about to change the region of BUFFER from START |
661 | to END. This checks the read-only properties of the region, calls | |
662 | the necessary modification hooks, and warns the next redisplay that | |
663 | it should pay attention to that area. */ | |
c660b094 | 664 | void |
04a759c8 JB |
665 | modify_region (buffer, start, end) |
666 | struct buffer *buffer; | |
b45433b3 JB |
667 | int start, end; |
668 | { | |
04a759c8 JB |
669 | struct buffer *old_buffer = current_buffer; |
670 | ||
671 | if (buffer != old_buffer) | |
672 | set_buffer_internal (buffer); | |
673 | ||
b45433b3 JB |
674 | prepare_to_modify_buffer (start, end); |
675 | ||
676 | if (start - 1 < beg_unchanged || unchanged_modified == MODIFF) | |
677 | beg_unchanged = start - 1; | |
678 | if (Z - end < end_unchanged | |
679 | || unchanged_modified == MODIFF) | |
680 | end_unchanged = Z - end; | |
83010cd6 | 681 | |
9fbf87cd | 682 | if (MODIFF <= SAVE_MODIFF) |
83010cd6 | 683 | record_first_change (); |
b45433b3 | 684 | MODIFF++; |
04a759c8 | 685 | |
069cdc4f RS |
686 | buffer->point_before_scroll = Qnil; |
687 | ||
04a759c8 JB |
688 | if (buffer != old_buffer) |
689 | set_buffer_internal (old_buffer); | |
b45433b3 JB |
690 | } |
691 | ||
692 | /* Check that it is okay to modify the buffer between START and END. | |
679194a6 JA |
693 | Run the before-change-function, if any. If intervals are in use, |
694 | verify that the text to be modified is not read-only, and call | |
695 | any modification properties the text may have. */ | |
b45433b3 | 696 | |
c660b094 | 697 | void |
b45433b3 JB |
698 | prepare_to_modify_buffer (start, end) |
699 | Lisp_Object start, end; | |
700 | { | |
d427b66a | 701 | if (!NILP (current_buffer->read_only)) |
b45433b3 JB |
702 | Fbarf_if_buffer_read_only (); |
703 | ||
679194a6 | 704 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
9fbf87cd | 705 | if (BUF_INTERVALS (current_buffer) != 0) |
648c4c55 | 706 | verify_interval_modification (current_buffer, start, end); |
b45433b3 JB |
707 | |
708 | #ifdef CLASH_DETECTION | |
f173b650 | 709 | if (!NILP (current_buffer->file_truename) |
9fbf87cd | 710 | && SAVE_MODIFF >= MODIFF) |
f173b650 | 711 | lock_file (current_buffer->file_truename); |
b45433b3 JB |
712 | #else |
713 | /* At least warn if this file has changed on disk since it was visited. */ | |
d427b66a | 714 | if (!NILP (current_buffer->filename) |
9fbf87cd | 715 | && SAVE_MODIFF >= MODIFF |
d427b66a JB |
716 | && NILP (Fverify_visited_file_modtime (Fcurrent_buffer ())) |
717 | && !NILP (Ffile_exists_p (current_buffer->filename))) | |
b45433b3 JB |
718 | call1 (intern ("ask-user-about-supersession-threat"), |
719 | current_buffer->filename); | |
720 | #endif /* not CLASH_DETECTION */ | |
721 | ||
722 | signal_before_change (start, end); | |
2f545eea | 723 | |
56e1065e JB |
724 | if (current_buffer->newline_cache) |
725 | invalidate_region_cache (current_buffer, | |
726 | current_buffer->newline_cache, | |
727 | start - BEG, Z - end); | |
728 | if (current_buffer->width_run_cache) | |
729 | invalidate_region_cache (current_buffer, | |
730 | current_buffer->width_run_cache, | |
731 | start - BEG, Z - end); | |
732 | ||
2f545eea | 733 | Vdeactivate_mark = Qt; |
b45433b3 JB |
734 | } |
735 | \f | |
736 | static Lisp_Object | |
737 | before_change_function_restore (value) | |
738 | Lisp_Object value; | |
739 | { | |
740 | Vbefore_change_function = value; | |
741 | } | |
742 | ||
743 | static Lisp_Object | |
744 | after_change_function_restore (value) | |
745 | Lisp_Object value; | |
746 | { | |
747 | Vafter_change_function = value; | |
748 | } | |
749 | ||
e45fb8bf RS |
750 | static Lisp_Object |
751 | before_change_functions_restore (value) | |
752 | Lisp_Object value; | |
753 | { | |
754 | Vbefore_change_functions = value; | |
755 | } | |
756 | ||
757 | static Lisp_Object | |
758 | after_change_functions_restore (value) | |
759 | Lisp_Object value; | |
760 | { | |
761 | Vafter_change_functions = value; | |
762 | } | |
763 | ||
eb8c3be9 | 764 | /* Signal a change to the buffer immediately before it happens. |
b45433b3 JB |
765 | START and END are the bounds of the text to be changed, |
766 | as Lisp objects. */ | |
767 | ||
c660b094 | 768 | void |
b45433b3 JB |
769 | signal_before_change (start, end) |
770 | Lisp_Object start, end; | |
771 | { | |
772 | /* If buffer is unmodified, run a special hook for that case. */ | |
9fbf87cd | 773 | if (SAVE_MODIFF >= MODIFF |
dbc4e1c1 JB |
774 | && !NILP (Vfirst_change_hook) |
775 | && !NILP (Vrun_hooks)) | |
776 | call1 (Vrun_hooks, Qfirst_change_hook); | |
777 | ||
b45433b3 | 778 | /* Now in any case run the before-change-function if any. */ |
d427b66a | 779 | if (!NILP (Vbefore_change_function)) |
b45433b3 JB |
780 | { |
781 | int count = specpdl_ptr - specpdl; | |
782 | Lisp_Object function; | |
783 | ||
784 | function = Vbefore_change_function; | |
e45fb8bf | 785 | |
b45433b3 JB |
786 | record_unwind_protect (after_change_function_restore, |
787 | Vafter_change_function); | |
788 | record_unwind_protect (before_change_function_restore, | |
789 | Vbefore_change_function); | |
e45fb8bf RS |
790 | record_unwind_protect (after_change_functions_restore, |
791 | Vafter_change_functions); | |
792 | record_unwind_protect (before_change_functions_restore, | |
793 | Vbefore_change_functions); | |
b45433b3 JB |
794 | Vafter_change_function = Qnil; |
795 | Vbefore_change_function = Qnil; | |
e45fb8bf RS |
796 | Vafter_change_functions = Qnil; |
797 | Vbefore_change_functions = Qnil; | |
b45433b3 JB |
798 | |
799 | call2 (function, start, end); | |
800 | unbind_to (count, Qnil); | |
801 | } | |
e45fb8bf RS |
802 | |
803 | /* Now in any case run the before-change-function if any. */ | |
804 | if (!NILP (Vbefore_change_functions)) | |
805 | { | |
806 | int count = specpdl_ptr - specpdl; | |
807 | Lisp_Object functions; | |
808 | ||
809 | functions = Vbefore_change_functions; | |
810 | ||
811 | record_unwind_protect (after_change_function_restore, | |
812 | Vafter_change_function); | |
813 | record_unwind_protect (before_change_function_restore, | |
814 | Vbefore_change_function); | |
815 | record_unwind_protect (after_change_functions_restore, | |
816 | Vafter_change_functions); | |
817 | record_unwind_protect (before_change_functions_restore, | |
818 | Vbefore_change_functions); | |
819 | Vafter_change_function = Qnil; | |
820 | Vbefore_change_function = Qnil; | |
821 | Vafter_change_functions = Qnil; | |
822 | Vbefore_change_functions = Qnil; | |
823 | ||
824 | while (CONSP (functions)) | |
825 | { | |
826 | call2 (XCONS (functions)->car, start, end); | |
827 | functions = XCONS (functions)->cdr; | |
828 | } | |
829 | unbind_to (count, Qnil); | |
830 | } | |
d07c0804 RS |
831 | |
832 | if (!NILP (current_buffer->overlays_before) | |
833 | || !NILP (current_buffer->overlays_after)) | |
835220e8 | 834 | report_overlay_modification (start, end, 0, start, end, Qnil); |
b45433b3 JB |
835 | } |
836 | ||
eb8c3be9 | 837 | /* Signal a change immediately after it happens. |
b45433b3 JB |
838 | POS is the address of the start of the changed text. |
839 | LENDEL is the number of characters of the text before the change. | |
840 | (Not the whole buffer; just the part that was changed.) | |
d07c0804 RS |
841 | LENINS is the number of characters in the changed text. |
842 | ||
843 | (Hence POS + LENINS - LENDEL is the position after the changed text.) */ | |
b45433b3 | 844 | |
c660b094 | 845 | void |
b45433b3 JB |
846 | signal_after_change (pos, lendel, lenins) |
847 | int pos, lendel, lenins; | |
848 | { | |
d427b66a | 849 | if (!NILP (Vafter_change_function)) |
b45433b3 JB |
850 | { |
851 | int count = specpdl_ptr - specpdl; | |
852 | Lisp_Object function; | |
853 | function = Vafter_change_function; | |
854 | ||
855 | record_unwind_protect (after_change_function_restore, | |
856 | Vafter_change_function); | |
857 | record_unwind_protect (before_change_function_restore, | |
858 | Vbefore_change_function); | |
e45fb8bf RS |
859 | record_unwind_protect (after_change_functions_restore, |
860 | Vafter_change_functions); | |
861 | record_unwind_protect (before_change_functions_restore, | |
862 | Vbefore_change_functions); | |
b45433b3 JB |
863 | Vafter_change_function = Qnil; |
864 | Vbefore_change_function = Qnil; | |
e45fb8bf RS |
865 | Vafter_change_functions = Qnil; |
866 | Vbefore_change_functions = Qnil; | |
b45433b3 JB |
867 | |
868 | call3 (function, make_number (pos), make_number (pos + lenins), | |
869 | make_number (lendel)); | |
870 | unbind_to (count, Qnil); | |
871 | } | |
e45fb8bf RS |
872 | if (!NILP (Vafter_change_functions)) |
873 | { | |
874 | int count = specpdl_ptr - specpdl; | |
875 | Lisp_Object functions; | |
876 | functions = Vafter_change_functions; | |
877 | ||
878 | record_unwind_protect (after_change_function_restore, | |
879 | Vafter_change_function); | |
880 | record_unwind_protect (before_change_function_restore, | |
881 | Vbefore_change_function); | |
882 | record_unwind_protect (after_change_functions_restore, | |
883 | Vafter_change_functions); | |
884 | record_unwind_protect (before_change_functions_restore, | |
885 | Vbefore_change_functions); | |
886 | Vafter_change_function = Qnil; | |
887 | Vbefore_change_function = Qnil; | |
888 | Vafter_change_functions = Qnil; | |
889 | Vbefore_change_functions = Qnil; | |
890 | ||
891 | while (CONSP (functions)) | |
892 | { | |
893 | call3 (XCONS (functions)->car, | |
894 | make_number (pos), make_number (pos + lenins), | |
895 | make_number (lendel)); | |
896 | functions = XCONS (functions)->cdr; | |
897 | } | |
898 | unbind_to (count, Qnil); | |
899 | } | |
d07c0804 RS |
900 | |
901 | if (!NILP (current_buffer->overlays_before) | |
902 | || !NILP (current_buffer->overlays_after)) | |
835220e8 | 903 | report_overlay_modification (make_number (pos), |
d07c0804 RS |
904 | make_number (pos + lenins - lendel), |
905 | 1, | |
906 | make_number (pos), make_number (pos + lenins), | |
907 | make_number (lendel)); | |
b45433b3 | 908 | } |