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 | |
7c938215 | 8 | the Free Software Foundation; either version 2, or (at your option) |
b45433b3 JB |
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 | |
14f6194b RS |
28 | #define min(x, y) ((x) < (y) ? (x) : (y)) |
29 | ||
395ec62e | 30 | static void insert_from_string_1 (); |
ef29f213 | 31 | static void insert_from_buffer_1 (); |
2bcaed71 KH |
32 | static void gap_left (); |
33 | static void gap_right (); | |
34 | static void adjust_markers (); | |
a27a38d8 | 35 | static void adjust_point (); |
395ec62e | 36 | |
b45433b3 JB |
37 | /* Move gap to position `pos'. |
38 | Note that this can quit! */ | |
39 | ||
c660b094 | 40 | void |
b45433b3 JB |
41 | move_gap (pos) |
42 | int pos; | |
43 | { | |
44 | if (pos < GPT) | |
45 | gap_left (pos, 0); | |
46 | else if (pos > GPT) | |
47 | gap_right (pos); | |
48 | } | |
49 | ||
50 | /* Move the gap to POS, which is less than the current GPT. | |
51 | If NEWGAP is nonzero, then don't update beg_unchanged and end_unchanged. */ | |
52 | ||
2bcaed71 | 53 | static void |
b45433b3 JB |
54 | gap_left (pos, newgap) |
55 | register int pos; | |
56 | int newgap; | |
57 | { | |
58 | register unsigned char *to, *from; | |
59 | register int i; | |
60 | int new_s1; | |
61 | ||
62 | pos--; | |
63 | ||
64 | if (!newgap) | |
65 | { | |
66 | if (unchanged_modified == MODIFF) | |
67 | { | |
68 | beg_unchanged = pos; | |
69 | end_unchanged = Z - pos - 1; | |
70 | } | |
71 | else | |
72 | { | |
73 | if (Z - GPT < end_unchanged) | |
74 | end_unchanged = Z - GPT; | |
75 | if (pos < beg_unchanged) | |
76 | beg_unchanged = pos; | |
77 | } | |
78 | } | |
79 | ||
80 | i = GPT; | |
81 | to = GAP_END_ADDR; | |
82 | from = GPT_ADDR; | |
83 | new_s1 = GPT - BEG; | |
84 | ||
85 | /* Now copy the characters. To move the gap down, | |
86 | copy characters up. */ | |
87 | ||
88 | while (1) | |
89 | { | |
90 | /* I gets number of characters left to copy. */ | |
91 | i = new_s1 - pos; | |
92 | if (i == 0) | |
93 | break; | |
94 | /* If a quit is requested, stop copying now. | |
95 | Change POS to be where we have actually moved the gap to. */ | |
96 | if (QUITP) | |
97 | { | |
98 | pos = new_s1; | |
99 | break; | |
100 | } | |
101 | /* Move at most 32000 chars before checking again for a quit. */ | |
102 | if (i > 32000) | |
103 | i = 32000; | |
104 | #ifdef GAP_USE_BCOPY | |
105 | if (i >= 128 | |
106 | /* bcopy is safe if the two areas of memory do not overlap | |
107 | or on systems where bcopy is always safe for moving upward. */ | |
108 | && (BCOPY_UPWARD_SAFE | |
109 | || to - from >= 128)) | |
110 | { | |
111 | /* If overlap is not safe, avoid it by not moving too many | |
112 | characters at once. */ | |
113 | if (!BCOPY_UPWARD_SAFE && i > to - from) | |
114 | i = to - from; | |
115 | new_s1 -= i; | |
116 | from -= i, to -= i; | |
117 | bcopy (from, to, i); | |
118 | } | |
119 | else | |
120 | #endif | |
121 | { | |
122 | new_s1 -= i; | |
123 | while (--i >= 0) | |
124 | *--to = *--from; | |
125 | } | |
126 | } | |
127 | ||
128 | /* Adjust markers, and buffer data structure, to put the gap at POS. | |
129 | POS is where the loop above stopped, which may be what was specified | |
130 | or may be where a quit was detected. */ | |
131 | adjust_markers (pos + 1, GPT, GAP_SIZE); | |
132 | GPT = pos + 1; | |
133 | QUIT; | |
134 | } | |
135 | ||
2bcaed71 | 136 | static void |
b45433b3 JB |
137 | gap_right (pos) |
138 | register int pos; | |
139 | { | |
140 | register unsigned char *to, *from; | |
141 | register int i; | |
142 | int new_s1; | |
143 | ||
144 | pos--; | |
145 | ||
146 | if (unchanged_modified == MODIFF) | |
147 | { | |
148 | beg_unchanged = pos; | |
149 | end_unchanged = Z - pos - 1; | |
150 | } | |
151 | else | |
152 | { | |
153 | if (Z - pos - 1 < end_unchanged) | |
154 | end_unchanged = Z - pos - 1; | |
155 | if (GPT - BEG < beg_unchanged) | |
156 | beg_unchanged = GPT - BEG; | |
157 | } | |
158 | ||
159 | i = GPT; | |
160 | from = GAP_END_ADDR; | |
161 | to = GPT_ADDR; | |
162 | new_s1 = GPT - 1; | |
163 | ||
164 | /* Now copy the characters. To move the gap up, | |
165 | copy characters down. */ | |
166 | ||
167 | while (1) | |
168 | { | |
169 | /* I gets number of characters left to copy. */ | |
170 | i = pos - new_s1; | |
171 | if (i == 0) | |
172 | break; | |
173 | /* If a quit is requested, stop copying now. | |
174 | Change POS to be where we have actually moved the gap to. */ | |
175 | if (QUITP) | |
176 | { | |
177 | pos = new_s1; | |
178 | break; | |
179 | } | |
180 | /* Move at most 32000 chars before checking again for a quit. */ | |
181 | if (i > 32000) | |
182 | i = 32000; | |
183 | #ifdef GAP_USE_BCOPY | |
184 | if (i >= 128 | |
185 | /* bcopy is safe if the two areas of memory do not overlap | |
186 | or on systems where bcopy is always safe for moving downward. */ | |
187 | && (BCOPY_DOWNWARD_SAFE | |
188 | || from - to >= 128)) | |
189 | { | |
190 | /* If overlap is not safe, avoid it by not moving too many | |
191 | characters at once. */ | |
192 | if (!BCOPY_DOWNWARD_SAFE && i > from - to) | |
193 | i = from - to; | |
194 | new_s1 += i; | |
195 | bcopy (from, to, i); | |
196 | from += i, to += i; | |
197 | } | |
198 | else | |
199 | #endif | |
200 | { | |
201 | new_s1 += i; | |
202 | while (--i >= 0) | |
203 | *to++ = *from++; | |
204 | } | |
205 | } | |
206 | ||
207 | adjust_markers (GPT + GAP_SIZE, pos + 1 + GAP_SIZE, - GAP_SIZE); | |
208 | GPT = pos + 1; | |
209 | QUIT; | |
210 | } | |
211 | ||
212 | /* Add `amount' to the position of every marker in the current buffer | |
213 | whose current position is between `from' (exclusive) and `to' (inclusive). | |
214 | Also, any markers past the outside of that interval, in the direction | |
215 | of adjustment, are first moved back to the near end of the interval | |
216 | and then adjusted by `amount'. */ | |
217 | ||
2bcaed71 | 218 | static void |
b45433b3 JB |
219 | adjust_markers (from, to, amount) |
220 | register int from, to, amount; | |
221 | { | |
222 | Lisp_Object marker; | |
223 | register struct Lisp_Marker *m; | |
224 | register int mpos; | |
225 | ||
9fbf87cd | 226 | marker = BUF_MARKERS (current_buffer); |
b45433b3 | 227 | |
d427b66a | 228 | while (!NILP (marker)) |
b45433b3 JB |
229 | { |
230 | m = XMARKER (marker); | |
231 | mpos = m->bufpos; | |
232 | if (amount > 0) | |
233 | { | |
234 | if (mpos > to && mpos < to + amount) | |
235 | mpos = to + amount; | |
236 | } | |
237 | else | |
238 | { | |
239 | if (mpos > from + amount && mpos <= from) | |
240 | mpos = from + amount; | |
241 | } | |
242 | if (mpos > from && mpos <= to) | |
243 | mpos += amount; | |
244 | m->bufpos = mpos; | |
245 | marker = m->chain; | |
246 | } | |
247 | } | |
a27a38d8 | 248 | |
beecb55b RS |
249 | /* Adjust markers whose insertion-type is t |
250 | for an insertion of AMOUNT characters at POS. */ | |
251 | ||
252 | static void | |
253 | adjust_markers_for_insert (pos, amount) | |
254 | register int pos, amount; | |
255 | { | |
256 | Lisp_Object marker; | |
257 | ||
258 | marker = BUF_MARKERS (current_buffer); | |
259 | ||
260 | while (!NILP (marker)) | |
261 | { | |
262 | register struct Lisp_Marker *m = XMARKER (marker); | |
263 | if (m->insertion_type && m->bufpos == pos) | |
264 | m->bufpos += amount; | |
265 | marker = m->chain; | |
266 | } | |
267 | } | |
268 | ||
a27a38d8 KH |
269 | /* Add the specified amount to point. This is used only when the value |
270 | of point changes due to an insert or delete; it does not represent | |
271 | a conceptual change in point as a marker. In particular, point is | |
272 | not crossing any interval boundaries, so there's no need to use the | |
273 | usual SET_PT macro. In fact it would be incorrect to do so, because | |
8e6208c5 | 274 | either the old or the new value of point is out of sync with the |
a27a38d8 KH |
275 | current set of intervals. */ |
276 | static void | |
277 | adjust_point (amount) | |
29eb72ac | 278 | int amount; |
a27a38d8 | 279 | { |
9fbf87cd | 280 | BUF_PT (current_buffer) += amount; |
a27a38d8 | 281 | } |
b45433b3 JB |
282 | \f |
283 | /* Make the gap INCREMENT characters longer. */ | |
284 | ||
c660b094 | 285 | void |
b45433b3 JB |
286 | make_gap (increment) |
287 | int increment; | |
288 | { | |
289 | unsigned char *result; | |
290 | Lisp_Object tem; | |
291 | int real_gap_loc; | |
292 | int old_gap_size; | |
293 | ||
294 | /* If we have to get more space, get enough to last a while. */ | |
295 | increment += 2000; | |
296 | ||
94056516 RS |
297 | /* Don't allow a buffer size that won't fit in an int |
298 | even if it will fit in a Lisp integer. | |
299 | That won't work because so many places use `int'. */ | |
300 | ||
14f6194b | 301 | if (Z - BEG + GAP_SIZE + increment |
68be917d | 302 | >= ((unsigned) 1 << (min (BITS_PER_INT, VALBITS) - 1))) |
14f6194b | 303 | error ("Buffer exceeds maximum size"); |
94056516 | 304 | |
9ac0d9e0 | 305 | BLOCK_INPUT; |
b45433b3 | 306 | result = BUFFER_REALLOC (BEG_ADDR, (Z - BEG + GAP_SIZE + increment)); |
9ac0d9e0 | 307 | |
b45433b3 | 308 | if (result == 0) |
270c2138 RS |
309 | { |
310 | UNBLOCK_INPUT; | |
311 | memory_full (); | |
312 | } | |
313 | ||
314 | /* We can't unblock until the new address is properly stored. */ | |
b45433b3 | 315 | BEG_ADDR = result; |
270c2138 | 316 | UNBLOCK_INPUT; |
b45433b3 JB |
317 | |
318 | /* Prevent quitting in move_gap. */ | |
319 | tem = Vinhibit_quit; | |
320 | Vinhibit_quit = Qt; | |
321 | ||
322 | real_gap_loc = GPT; | |
323 | old_gap_size = GAP_SIZE; | |
324 | ||
325 | /* Call the newly allocated space a gap at the end of the whole space. */ | |
326 | GPT = Z + GAP_SIZE; | |
327 | GAP_SIZE = increment; | |
328 | ||
329 | /* Move the new gap down to be consecutive with the end of the old one. | |
330 | This adjusts the markers properly too. */ | |
331 | gap_left (real_gap_loc + old_gap_size, 1); | |
332 | ||
333 | /* Now combine the two into one large gap. */ | |
334 | GAP_SIZE += old_gap_size; | |
335 | GPT = real_gap_loc; | |
336 | ||
337 | Vinhibit_quit = tem; | |
338 | } | |
339 | \f | |
340 | /* Insert a string of specified length before point. | |
ef29f213 KH |
341 | DO NOT use this for the contents of a Lisp string or a Lisp buffer! |
342 | prepare_to_modify_buffer could relocate the text. */ | |
b45433b3 | 343 | |
c660b094 | 344 | void |
b45433b3 JB |
345 | insert (string, length) |
346 | register unsigned char *string; | |
347 | register length; | |
348 | { | |
395ec62e KH |
349 | if (length > 0) |
350 | { | |
c660b094 | 351 | insert_1 (string, length, 0, 1); |
cd11ef31 RS |
352 | signal_after_change (PT-length, 0, length); |
353 | } | |
354 | } | |
355 | ||
c660b094 | 356 | void |
cd11ef31 RS |
357 | insert_and_inherit (string, length) |
358 | register unsigned char *string; | |
359 | register length; | |
360 | { | |
361 | if (length > 0) | |
362 | { | |
c660b094 | 363 | insert_1 (string, length, 1, 1); |
2bcaed71 | 364 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
365 | } |
366 | } | |
b45433b3 | 367 | |
c660b094 KH |
368 | void |
369 | insert_1 (string, length, inherit, prepare) | |
395ec62e | 370 | register unsigned char *string; |
c660b094 KH |
371 | register int length; |
372 | int inherit, prepare; | |
395ec62e KH |
373 | { |
374 | register Lisp_Object temp; | |
b45433b3 | 375 | |
c660b094 KH |
376 | if (prepare) |
377 | prepare_to_modify_buffer (PT, PT); | |
b45433b3 | 378 | |
2bcaed71 KH |
379 | if (PT != GPT) |
380 | move_gap (PT); | |
b45433b3 JB |
381 | if (GAP_SIZE < length) |
382 | make_gap (length - GAP_SIZE); | |
383 | ||
2bcaed71 | 384 | record_insert (PT, length); |
b45433b3 JB |
385 | MODIFF++; |
386 | ||
387 | bcopy (string, GPT_ADDR, length); | |
388 | ||
648c4c55 | 389 | #ifdef USE_TEXT_PROPERTIES |
9fbf87cd | 390 | if (BUF_INTERVALS (current_buffer) != 0) |
648c4c55 RS |
391 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES. */ |
392 | offset_intervals (current_buffer, PT, length); | |
393 | #endif | |
679194a6 | 394 | |
b45433b3 JB |
395 | GAP_SIZE -= length; |
396 | GPT += length; | |
397 | ZV += length; | |
398 | Z += length; | |
adde4858 | 399 | adjust_overlays_for_insert (PT, length); |
beecb55b | 400 | adjust_markers_for_insert (PT, length); |
a27a38d8 | 401 | adjust_point (length); |
cd11ef31 | 402 | |
648c4c55 | 403 | #ifdef USE_TEXT_PROPERTIES |
9fbf87cd | 404 | if (!inherit && BUF_INTERVALS (current_buffer) != 0) |
cd11ef31 RS |
405 | Fset_text_properties (make_number (PT - length), make_number (PT), |
406 | Qnil, Qnil); | |
648c4c55 | 407 | #endif |
b45433b3 JB |
408 | } |
409 | ||
679194a6 JA |
410 | /* Insert the part of the text of STRING, a Lisp object assumed to be |
411 | of type string, consisting of the LENGTH characters starting at | |
412 | position POS. If the text of STRING has properties, they are absorbed | |
413 | into the buffer. | |
414 | ||
415 | It does not work to use `insert' for this, because a GC could happen | |
7e1ea612 JB |
416 | before we bcopy the stuff into the buffer, and relocate the string |
417 | without insert noticing. */ | |
679194a6 | 418 | |
c660b094 | 419 | void |
9391e591 | 420 | insert_from_string (string, pos, length, inherit) |
b45433b3 JB |
421 | Lisp_Object string; |
422 | register int pos, length; | |
9391e591 | 423 | int inherit; |
395ec62e KH |
424 | { |
425 | if (length > 0) | |
426 | { | |
427 | insert_from_string_1 (string, pos, length, inherit); | |
2bcaed71 | 428 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
429 | } |
430 | } | |
431 | ||
432 | static void | |
433 | insert_from_string_1 (string, pos, length, inherit) | |
434 | Lisp_Object string; | |
435 | register int pos, length; | |
436 | int inherit; | |
b45433b3 JB |
437 | { |
438 | register Lisp_Object temp; | |
439 | struct gcpro gcpro1; | |
440 | ||
b45433b3 | 441 | /* Make sure point-max won't overflow after this insertion. */ |
eb7db9e6 | 442 | XSETINT (temp, length + Z); |
b45433b3 JB |
443 | if (length + Z != XINT (temp)) |
444 | error ("maximum buffer size exceeded"); | |
445 | ||
446 | GCPRO1 (string); | |
2bcaed71 | 447 | prepare_to_modify_buffer (PT, PT); |
b45433b3 | 448 | |
2bcaed71 KH |
449 | if (PT != GPT) |
450 | move_gap (PT); | |
b45433b3 JB |
451 | if (GAP_SIZE < length) |
452 | make_gap (length - GAP_SIZE); | |
453 | ||
2bcaed71 | 454 | record_insert (PT, length); |
b45433b3 JB |
455 | MODIFF++; |
456 | UNGCPRO; | |
457 | ||
458 | bcopy (XSTRING (string)->data, GPT_ADDR, length); | |
459 | ||
679194a6 | 460 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
2bcaed71 | 461 | offset_intervals (current_buffer, PT, length); |
679194a6 | 462 | |
b45433b3 JB |
463 | GAP_SIZE -= length; |
464 | GPT += length; | |
465 | ZV += length; | |
466 | Z += length; | |
adde4858 | 467 | adjust_overlays_for_insert (PT, length); |
beecb55b | 468 | adjust_markers_for_insert (PT, length); |
679194a6 JA |
469 | |
470 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ | |
2bcaed71 | 471 | graft_intervals_into_buffer (XSTRING (string)->intervals, PT, length, |
9391e591 | 472 | current_buffer, inherit); |
679194a6 | 473 | |
a27a38d8 | 474 | adjust_point (length); |
b45433b3 JB |
475 | } |
476 | ||
ef29f213 KH |
477 | /* Insert text from BUF, starting at POS and having length LENGTH, into the |
478 | current buffer. If the text in BUF has properties, they are absorbed | |
479 | into the current buffer. | |
480 | ||
481 | It does not work to use `insert' for this, because a malloc could happen | |
482 | and relocate BUF's text before the bcopy happens. */ | |
483 | ||
484 | void | |
485 | insert_from_buffer (buf, pos, length, inherit) | |
486 | struct buffer *buf; | |
487 | int pos, length; | |
488 | int inherit; | |
489 | { | |
490 | if (length > 0) | |
491 | { | |
492 | insert_from_buffer_1 (buf, pos, length, inherit); | |
493 | signal_after_change (PT-length, 0, length); | |
494 | } | |
495 | } | |
496 | ||
497 | static void | |
498 | insert_from_buffer_1 (buf, pos, length, inherit) | |
499 | struct buffer *buf; | |
500 | int pos, length; | |
501 | int inherit; | |
502 | { | |
503 | register Lisp_Object temp; | |
504 | int chunk; | |
505 | ||
506 | /* Make sure point-max won't overflow after this insertion. */ | |
507 | XSETINT (temp, length + Z); | |
508 | if (length + Z != XINT (temp)) | |
509 | error ("maximum buffer size exceeded"); | |
510 | ||
511 | prepare_to_modify_buffer (PT, PT); | |
512 | ||
513 | if (PT != GPT) | |
514 | move_gap (PT); | |
515 | if (GAP_SIZE < length) | |
516 | make_gap (length - GAP_SIZE); | |
517 | ||
518 | record_insert (PT, length); | |
519 | MODIFF++; | |
520 | ||
521 | if (pos < BUF_GPT (buf)) | |
522 | { | |
61bd0e9c RS |
523 | chunk = BUF_GPT (buf) - pos; |
524 | if (chunk > length) | |
525 | chunk = length; | |
ef29f213 KH |
526 | bcopy (BUF_CHAR_ADDRESS (buf, pos), GPT_ADDR, chunk); |
527 | } | |
528 | else | |
529 | chunk = 0; | |
530 | if (chunk < length) | |
531 | bcopy (BUF_CHAR_ADDRESS (buf, pos + chunk), | |
532 | GPT_ADDR + chunk, length - chunk); | |
533 | ||
534 | #ifdef USE_TEXT_PROPERTIES | |
9fbf87cd | 535 | if (BUF_INTERVALS (current_buffer) != 0) |
ef29f213 KH |
536 | offset_intervals (current_buffer, PT, length); |
537 | #endif | |
538 | ||
539 | GAP_SIZE -= length; | |
540 | GPT += length; | |
541 | ZV += length; | |
542 | Z += length; | |
adde4858 | 543 | adjust_overlays_for_insert (PT, length); |
beecb55b | 544 | adjust_markers_for_insert (PT, length); |
ef29f213 KH |
545 | adjust_point (length); |
546 | ||
547 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ | |
9fbf87cd RS |
548 | graft_intervals_into_buffer (copy_intervals (BUF_INTERVALS (buf), |
549 | pos, length), | |
ef29f213 KH |
550 | PT - length, length, current_buffer, inherit); |
551 | } | |
552 | ||
b45433b3 JB |
553 | /* Insert the character C before point */ |
554 | ||
555 | void | |
556 | insert_char (c) | |
557 | unsigned char c; | |
558 | { | |
559 | insert (&c, 1); | |
560 | } | |
561 | ||
562 | /* Insert the null-terminated string S before point */ | |
563 | ||
564 | void | |
565 | insert_string (s) | |
566 | char *s; | |
567 | { | |
568 | insert (s, strlen (s)); | |
569 | } | |
570 | ||
571 | /* Like `insert' except that all markers pointing at the place where | |
572 | the insertion happens are adjusted to point after it. | |
573 | Don't use this function to insert part of a Lisp string, | |
574 | since gc could happen and relocate it. */ | |
575 | ||
c660b094 | 576 | void |
b45433b3 JB |
577 | insert_before_markers (string, length) |
578 | unsigned char *string; | |
579 | register int length; | |
580 | { | |
395ec62e KH |
581 | if (length > 0) |
582 | { | |
2bcaed71 | 583 | register int opoint = PT; |
c660b094 | 584 | insert_1 (string, length, 0, 1); |
395ec62e | 585 | adjust_markers (opoint - 1, opoint, length); |
2bcaed71 | 586 | signal_after_change (PT-length, 0, length); |
395ec62e | 587 | } |
b45433b3 JB |
588 | } |
589 | ||
c660b094 | 590 | void |
598fb6fe RS |
591 | insert_before_markers_and_inherit (string, length) |
592 | unsigned char *string; | |
593 | register int length; | |
594 | { | |
595 | if (length > 0) | |
596 | { | |
597 | register int opoint = PT; | |
c660b094 | 598 | insert_1 (string, length, 1, 1); |
598fb6fe RS |
599 | adjust_markers (opoint - 1, opoint, length); |
600 | signal_after_change (PT-length, 0, length); | |
601 | } | |
602 | } | |
603 | ||
b45433b3 JB |
604 | /* Insert part of a Lisp string, relocating markers after. */ |
605 | ||
c660b094 | 606 | void |
9391e591 | 607 | insert_from_string_before_markers (string, pos, length, inherit) |
b45433b3 JB |
608 | Lisp_Object string; |
609 | register int pos, length; | |
9391e591 | 610 | int inherit; |
b45433b3 | 611 | { |
395ec62e KH |
612 | if (length > 0) |
613 | { | |
2bcaed71 | 614 | register int opoint = PT; |
395ec62e KH |
615 | insert_from_string_1 (string, pos, length, inherit); |
616 | adjust_markers (opoint - 1, opoint, length); | |
2bcaed71 | 617 | signal_after_change (PT-length, 0, length); |
395ec62e | 618 | } |
b45433b3 JB |
619 | } |
620 | \f | |
621 | /* Delete characters in current buffer | |
622 | from FROM up to (but not including) TO. */ | |
623 | ||
c660b094 | 624 | void |
b45433b3 JB |
625 | del_range (from, to) |
626 | register int from, to; | |
47c64747 | 627 | { |
c660b094 | 628 | del_range_1 (from, to, 1); |
47c64747 RS |
629 | } |
630 | ||
631 | /* Like del_range; PREPARE says whether to call prepare_to_modify_buffer. */ | |
632 | ||
c660b094 | 633 | void |
47c64747 RS |
634 | del_range_1 (from, to, prepare) |
635 | register int from, to, prepare; | |
b45433b3 JB |
636 | { |
637 | register int numdel; | |
638 | ||
639 | /* Make args be valid */ | |
640 | if (from < BEGV) | |
641 | from = BEGV; | |
642 | if (to > ZV) | |
643 | to = ZV; | |
644 | ||
645 | if ((numdel = to - from) <= 0) | |
646 | return; | |
647 | ||
648 | /* Make sure the gap is somewhere in or next to what we are deleting. */ | |
649 | if (from > GPT) | |
650 | gap_right (from); | |
651 | if (to < GPT) | |
652 | gap_left (to, 0); | |
653 | ||
47c64747 RS |
654 | if (prepare) |
655 | prepare_to_modify_buffer (from, to); | |
b45433b3 | 656 | |
be09561e RS |
657 | record_delete (from, numdel); |
658 | MODIFF++; | |
659 | ||
b45433b3 | 660 | /* Relocate point as if it were a marker. */ |
2bcaed71 | 661 | if (from < PT) |
a27a38d8 | 662 | adjust_point (from - (PT < to ? PT : to)); |
b45433b3 | 663 | |
16032db6 | 664 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
83010cd6 | 665 | offset_intervals (current_buffer, from, - numdel); |
16032db6 | 666 | |
b45433b3 JB |
667 | /* Relocate all markers pointing into the new, larger gap |
668 | to point at the end of the text before the gap. */ | |
669 | adjust_markers (to + GAP_SIZE, to + GAP_SIZE, - numdel - GAP_SIZE); | |
670 | ||
adde4858 | 671 | /* Adjust the overlay center as needed. This must be done after |
a7f38d28 | 672 | adjusting the markers that bound the overlays. */ |
adde4858 KH |
673 | adjust_overlays_for_delete (from, numdel); |
674 | ||
b45433b3 JB |
675 | GAP_SIZE += numdel; |
676 | ZV -= numdel; | |
677 | Z -= numdel; | |
678 | GPT = from; | |
679 | ||
680 | if (GPT - BEG < beg_unchanged) | |
681 | beg_unchanged = GPT - BEG; | |
682 | if (Z - GPT < end_unchanged) | |
683 | end_unchanged = Z - GPT; | |
684 | ||
d386034e | 685 | evaporate_overlays (from); |
b45433b3 JB |
686 | signal_after_change (from, numdel, 0); |
687 | } | |
688 | \f | |
04a759c8 JB |
689 | /* Call this if you're about to change the region of BUFFER from START |
690 | to END. This checks the read-only properties of the region, calls | |
691 | the necessary modification hooks, and warns the next redisplay that | |
692 | it should pay attention to that area. */ | |
c660b094 | 693 | void |
04a759c8 JB |
694 | modify_region (buffer, start, end) |
695 | struct buffer *buffer; | |
b45433b3 JB |
696 | int start, end; |
697 | { | |
04a759c8 JB |
698 | struct buffer *old_buffer = current_buffer; |
699 | ||
700 | if (buffer != old_buffer) | |
701 | set_buffer_internal (buffer); | |
702 | ||
b45433b3 JB |
703 | prepare_to_modify_buffer (start, end); |
704 | ||
705 | if (start - 1 < beg_unchanged || unchanged_modified == MODIFF) | |
706 | beg_unchanged = start - 1; | |
707 | if (Z - end < end_unchanged | |
708 | || unchanged_modified == MODIFF) | |
709 | end_unchanged = Z - end; | |
83010cd6 | 710 | |
9fbf87cd | 711 | if (MODIFF <= SAVE_MODIFF) |
83010cd6 | 712 | record_first_change (); |
b45433b3 | 713 | MODIFF++; |
04a759c8 | 714 | |
069cdc4f RS |
715 | buffer->point_before_scroll = Qnil; |
716 | ||
04a759c8 JB |
717 | if (buffer != old_buffer) |
718 | set_buffer_internal (old_buffer); | |
b45433b3 JB |
719 | } |
720 | ||
721 | /* Check that it is okay to modify the buffer between START and END. | |
679194a6 JA |
722 | Run the before-change-function, if any. If intervals are in use, |
723 | verify that the text to be modified is not read-only, and call | |
724 | any modification properties the text may have. */ | |
b45433b3 | 725 | |
c660b094 | 726 | void |
b45433b3 JB |
727 | prepare_to_modify_buffer (start, end) |
728 | Lisp_Object start, end; | |
729 | { | |
d427b66a | 730 | if (!NILP (current_buffer->read_only)) |
b45433b3 JB |
731 | Fbarf_if_buffer_read_only (); |
732 | ||
679194a6 | 733 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
9fbf87cd | 734 | if (BUF_INTERVALS (current_buffer) != 0) |
648c4c55 | 735 | verify_interval_modification (current_buffer, start, end); |
b45433b3 JB |
736 | |
737 | #ifdef CLASH_DETECTION | |
f173b650 | 738 | if (!NILP (current_buffer->file_truename) |
ab6c5c0c RS |
739 | /* Make binding buffer-file-name to nil effective. */ |
740 | && !NILP (current_buffer->filename) | |
9fbf87cd | 741 | && SAVE_MODIFF >= MODIFF) |
f173b650 | 742 | lock_file (current_buffer->file_truename); |
b45433b3 JB |
743 | #else |
744 | /* At least warn if this file has changed on disk since it was visited. */ | |
d427b66a | 745 | if (!NILP (current_buffer->filename) |
9fbf87cd | 746 | && SAVE_MODIFF >= MODIFF |
d427b66a JB |
747 | && NILP (Fverify_visited_file_modtime (Fcurrent_buffer ())) |
748 | && !NILP (Ffile_exists_p (current_buffer->filename))) | |
b45433b3 JB |
749 | call1 (intern ("ask-user-about-supersession-threat"), |
750 | current_buffer->filename); | |
751 | #endif /* not CLASH_DETECTION */ | |
752 | ||
753 | signal_before_change (start, end); | |
2f545eea | 754 | |
56e1065e JB |
755 | if (current_buffer->newline_cache) |
756 | invalidate_region_cache (current_buffer, | |
757 | current_buffer->newline_cache, | |
758 | start - BEG, Z - end); | |
759 | if (current_buffer->width_run_cache) | |
760 | invalidate_region_cache (current_buffer, | |
761 | current_buffer->width_run_cache, | |
762 | start - BEG, Z - end); | |
763 | ||
2f545eea | 764 | Vdeactivate_mark = Qt; |
b45433b3 JB |
765 | } |
766 | \f | |
eb8c3be9 | 767 | /* Signal a change to the buffer immediately before it happens. |
b45433b3 JB |
768 | START and END are the bounds of the text to be changed, |
769 | as Lisp objects. */ | |
770 | ||
c660b094 | 771 | void |
b45433b3 JB |
772 | signal_before_change (start, end) |
773 | Lisp_Object start, end; | |
774 | { | |
775 | /* If buffer is unmodified, run a special hook for that case. */ | |
9fbf87cd | 776 | if (SAVE_MODIFF >= MODIFF |
dbc4e1c1 JB |
777 | && !NILP (Vfirst_change_hook) |
778 | && !NILP (Vrun_hooks)) | |
779 | call1 (Vrun_hooks, Qfirst_change_hook); | |
780 | ||
3d1e2d9c RS |
781 | /* Run the before-change-function if any. |
782 | We don't bother "binding" this variable to nil | |
783 | because it is obsolete anyway and new code should not use it. */ | |
d427b66a | 784 | if (!NILP (Vbefore_change_function)) |
3d1e2d9c | 785 | call2 (Vbefore_change_function, start, end); |
e45fb8bf | 786 | |
3d1e2d9c | 787 | /* Now run the before-change-functions if any. */ |
e45fb8bf RS |
788 | if (!NILP (Vbefore_change_functions)) |
789 | { | |
3d1e2d9c RS |
790 | Lisp_Object args[3]; |
791 | Lisp_Object before_change_functions; | |
792 | Lisp_Object after_change_functions; | |
793 | struct gcpro gcpro1, gcpro2; | |
794 | ||
795 | /* "Bind" before-change-functions and after-change-functions | |
796 | to nil--but in a way that errors don't know about. | |
797 | That way, if there's an error in them, they will stay nil. */ | |
798 | before_change_functions = Vbefore_change_functions; | |
799 | after_change_functions = Vafter_change_functions; | |
c82c1da0 KH |
800 | Vbefore_change_functions = Qnil; |
801 | Vafter_change_functions = Qnil; | |
3d1e2d9c RS |
802 | GCPRO2 (before_change_functions, after_change_functions); |
803 | ||
804 | /* Actually run the hook functions. */ | |
805 | args[0] = Qbefore_change_functions; | |
806 | args[1] = start; | |
807 | args[2] = end; | |
808 | run_hook_list_with_args (before_change_functions, 3, args); | |
809 | ||
810 | /* "Unbind" the variables we "bound" to nil. */ | |
811 | Vbefore_change_functions = before_change_functions; | |
812 | Vafter_change_functions = after_change_functions; | |
813 | UNGCPRO; | |
e45fb8bf | 814 | } |
d07c0804 RS |
815 | |
816 | if (!NILP (current_buffer->overlays_before) | |
817 | || !NILP (current_buffer->overlays_after)) | |
835220e8 | 818 | report_overlay_modification (start, end, 0, start, end, Qnil); |
b45433b3 JB |
819 | } |
820 | ||
eb8c3be9 | 821 | /* Signal a change immediately after it happens. |
b45433b3 JB |
822 | POS is the address of the start of the changed text. |
823 | LENDEL is the number of characters of the text before the change. | |
824 | (Not the whole buffer; just the part that was changed.) | |
d07c0804 RS |
825 | LENINS is the number of characters in the changed text. |
826 | ||
827 | (Hence POS + LENINS - LENDEL is the position after the changed text.) */ | |
b45433b3 | 828 | |
c660b094 | 829 | void |
b45433b3 JB |
830 | signal_after_change (pos, lendel, lenins) |
831 | int pos, lendel, lenins; | |
832 | { | |
3d1e2d9c RS |
833 | /* Run the after-change-function if any. |
834 | We don't bother "binding" this variable to nil | |
835 | because it is obsolete anyway and new code should not use it. */ | |
d427b66a | 836 | if (!NILP (Vafter_change_function)) |
3d1e2d9c RS |
837 | call3 (Vafter_change_function, |
838 | make_number (pos), make_number (pos + lenins), | |
839 | make_number (lendel)); | |
b45433b3 | 840 | |
e45fb8bf RS |
841 | if (!NILP (Vafter_change_functions)) |
842 | { | |
3d1e2d9c RS |
843 | Lisp_Object args[4]; |
844 | Lisp_Object before_change_functions; | |
845 | Lisp_Object after_change_functions; | |
846 | struct gcpro gcpro1, gcpro2; | |
847 | ||
848 | /* "Bind" before-change-functions and after-change-functions | |
849 | to nil--but in a way that errors don't know about. | |
850 | That way, if there's an error in them, they will stay nil. */ | |
851 | before_change_functions = Vbefore_change_functions; | |
852 | after_change_functions = Vafter_change_functions; | |
c82c1da0 KH |
853 | Vbefore_change_functions = Qnil; |
854 | Vafter_change_functions = Qnil; | |
3d1e2d9c RS |
855 | GCPRO2 (before_change_functions, after_change_functions); |
856 | ||
857 | /* Actually run the hook functions. */ | |
858 | args[0] = Qafter_change_functions; | |
859 | XSETFASTINT (args[1], pos); | |
860 | XSETFASTINT (args[2], pos + lenins); | |
861 | XSETFASTINT (args[3], lendel); | |
862 | run_hook_list_with_args (after_change_functions, | |
863 | 4, args); | |
864 | ||
865 | /* "Unbind" the variables we "bound" to nil. */ | |
866 | Vbefore_change_functions = before_change_functions; | |
867 | Vafter_change_functions = after_change_functions; | |
868 | UNGCPRO; | |
e45fb8bf | 869 | } |
d07c0804 RS |
870 | |
871 | if (!NILP (current_buffer->overlays_before) | |
872 | || !NILP (current_buffer->overlays_after)) | |
835220e8 | 873 | report_overlay_modification (make_number (pos), |
d07c0804 RS |
874 | make_number (pos + lenins - lendel), |
875 | 1, | |
876 | make_number (pos), make_number (pos + lenins), | |
877 | make_number (lendel)); | |
c5ca0786 RS |
878 | |
879 | /* After an insertion, call the text properties | |
880 | insert-behind-hooks or insert-in-front-hooks. */ | |
881 | if (lendel == 0) | |
882 | report_interval_modification (pos, pos + lenins); | |
b45433b3 | 883 | } |