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 | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
b45433b3 JB |
20 | |
21 | ||
18160b98 | 22 | #include <config.h> |
b45433b3 | 23 | #include "lisp.h" |
679194a6 | 24 | #include "intervals.h" |
b45433b3 JB |
25 | #include "buffer.h" |
26 | #include "window.h" | |
d014bf88 | 27 | #include "blockinput.h" |
b45433b3 | 28 | |
14f6194b RS |
29 | #define min(x, y) ((x) < (y) ? (x) : (y)) |
30 | ||
395ec62e | 31 | static void insert_from_string_1 (); |
ef29f213 | 32 | static void insert_from_buffer_1 (); |
2bcaed71 KH |
33 | static void gap_left (); |
34 | static void gap_right (); | |
35 | static void adjust_markers (); | |
a27a38d8 | 36 | static void adjust_point (); |
395ec62e | 37 | |
b45433b3 JB |
38 | /* Move gap to position `pos'. |
39 | Note that this can quit! */ | |
40 | ||
c660b094 | 41 | void |
b45433b3 JB |
42 | move_gap (pos) |
43 | int pos; | |
44 | { | |
45 | if (pos < GPT) | |
46 | gap_left (pos, 0); | |
47 | else if (pos > GPT) | |
48 | gap_right (pos); | |
49 | } | |
50 | ||
51 | /* Move the gap to POS, which is less than the current GPT. | |
52 | If NEWGAP is nonzero, then don't update beg_unchanged and end_unchanged. */ | |
53 | ||
2bcaed71 | 54 | static void |
b45433b3 JB |
55 | gap_left (pos, newgap) |
56 | register int pos; | |
57 | int newgap; | |
58 | { | |
59 | register unsigned char *to, *from; | |
60 | register int i; | |
61 | int new_s1; | |
62 | ||
63 | pos--; | |
64 | ||
65 | if (!newgap) | |
66 | { | |
67 | if (unchanged_modified == MODIFF) | |
68 | { | |
69 | beg_unchanged = pos; | |
70 | end_unchanged = Z - pos - 1; | |
71 | } | |
72 | else | |
73 | { | |
74 | if (Z - GPT < end_unchanged) | |
75 | end_unchanged = Z - GPT; | |
76 | if (pos < beg_unchanged) | |
77 | beg_unchanged = pos; | |
78 | } | |
79 | } | |
80 | ||
81 | i = GPT; | |
82 | to = GAP_END_ADDR; | |
83 | from = GPT_ADDR; | |
84 | new_s1 = GPT - BEG; | |
85 | ||
86 | /* Now copy the characters. To move the gap down, | |
87 | copy characters up. */ | |
88 | ||
89 | while (1) | |
90 | { | |
91 | /* I gets number of characters left to copy. */ | |
92 | i = new_s1 - pos; | |
93 | if (i == 0) | |
94 | break; | |
95 | /* If a quit is requested, stop copying now. | |
96 | Change POS to be where we have actually moved the gap to. */ | |
97 | if (QUITP) | |
98 | { | |
99 | pos = new_s1; | |
100 | break; | |
101 | } | |
102 | /* Move at most 32000 chars before checking again for a quit. */ | |
103 | if (i > 32000) | |
104 | i = 32000; | |
105 | #ifdef GAP_USE_BCOPY | |
106 | if (i >= 128 | |
107 | /* bcopy is safe if the two areas of memory do not overlap | |
108 | or on systems where bcopy is always safe for moving upward. */ | |
109 | && (BCOPY_UPWARD_SAFE | |
110 | || to - from >= 128)) | |
111 | { | |
112 | /* If overlap is not safe, avoid it by not moving too many | |
113 | characters at once. */ | |
114 | if (!BCOPY_UPWARD_SAFE && i > to - from) | |
115 | i = to - from; | |
116 | new_s1 -= i; | |
117 | from -= i, to -= i; | |
118 | bcopy (from, to, i); | |
119 | } | |
120 | else | |
121 | #endif | |
122 | { | |
123 | new_s1 -= i; | |
124 | while (--i >= 0) | |
125 | *--to = *--from; | |
126 | } | |
127 | } | |
128 | ||
129 | /* Adjust markers, and buffer data structure, to put the gap at POS. | |
130 | POS is where the loop above stopped, which may be what was specified | |
131 | or may be where a quit was detected. */ | |
132 | adjust_markers (pos + 1, GPT, GAP_SIZE); | |
133 | GPT = pos + 1; | |
134 | QUIT; | |
135 | } | |
136 | ||
2bcaed71 | 137 | static void |
b45433b3 JB |
138 | gap_right (pos) |
139 | register int pos; | |
140 | { | |
141 | register unsigned char *to, *from; | |
142 | register int i; | |
143 | int new_s1; | |
144 | ||
145 | pos--; | |
146 | ||
147 | if (unchanged_modified == MODIFF) | |
148 | { | |
149 | beg_unchanged = pos; | |
150 | end_unchanged = Z - pos - 1; | |
151 | } | |
152 | else | |
153 | { | |
154 | if (Z - pos - 1 < end_unchanged) | |
155 | end_unchanged = Z - pos - 1; | |
156 | if (GPT - BEG < beg_unchanged) | |
157 | beg_unchanged = GPT - BEG; | |
158 | } | |
159 | ||
160 | i = GPT; | |
161 | from = GAP_END_ADDR; | |
162 | to = GPT_ADDR; | |
163 | new_s1 = GPT - 1; | |
164 | ||
165 | /* Now copy the characters. To move the gap up, | |
166 | copy characters down. */ | |
167 | ||
168 | while (1) | |
169 | { | |
170 | /* I gets number of characters left to copy. */ | |
171 | i = pos - new_s1; | |
172 | if (i == 0) | |
173 | break; | |
174 | /* If a quit is requested, stop copying now. | |
175 | Change POS to be where we have actually moved the gap to. */ | |
176 | if (QUITP) | |
177 | { | |
178 | pos = new_s1; | |
179 | break; | |
180 | } | |
181 | /* Move at most 32000 chars before checking again for a quit. */ | |
182 | if (i > 32000) | |
183 | i = 32000; | |
184 | #ifdef GAP_USE_BCOPY | |
185 | if (i >= 128 | |
186 | /* bcopy is safe if the two areas of memory do not overlap | |
187 | or on systems where bcopy is always safe for moving downward. */ | |
188 | && (BCOPY_DOWNWARD_SAFE | |
189 | || from - to >= 128)) | |
190 | { | |
191 | /* If overlap is not safe, avoid it by not moving too many | |
192 | characters at once. */ | |
193 | if (!BCOPY_DOWNWARD_SAFE && i > from - to) | |
194 | i = from - to; | |
195 | new_s1 += i; | |
196 | bcopy (from, to, i); | |
197 | from += i, to += i; | |
198 | } | |
199 | else | |
200 | #endif | |
201 | { | |
202 | new_s1 += i; | |
203 | while (--i >= 0) | |
204 | *to++ = *from++; | |
205 | } | |
206 | } | |
207 | ||
208 | adjust_markers (GPT + GAP_SIZE, pos + 1 + GAP_SIZE, - GAP_SIZE); | |
209 | GPT = pos + 1; | |
210 | QUIT; | |
211 | } | |
212 | ||
213 | /* Add `amount' to the position of every marker in the current buffer | |
214 | whose current position is between `from' (exclusive) and `to' (inclusive). | |
215 | Also, any markers past the outside of that interval, in the direction | |
216 | of adjustment, are first moved back to the near end of the interval | |
217 | and then adjusted by `amount'. */ | |
218 | ||
2bcaed71 | 219 | static void |
b45433b3 JB |
220 | adjust_markers (from, to, amount) |
221 | register int from, to, amount; | |
222 | { | |
223 | Lisp_Object marker; | |
224 | register struct Lisp_Marker *m; | |
225 | register int mpos; | |
226 | ||
9fbf87cd | 227 | marker = BUF_MARKERS (current_buffer); |
b45433b3 | 228 | |
d427b66a | 229 | while (!NILP (marker)) |
b45433b3 JB |
230 | { |
231 | m = XMARKER (marker); | |
232 | mpos = m->bufpos; | |
233 | if (amount > 0) | |
234 | { | |
235 | if (mpos > to && mpos < to + amount) | |
236 | mpos = to + amount; | |
237 | } | |
238 | else | |
239 | { | |
240 | if (mpos > from + amount && mpos <= from) | |
241 | mpos = from + amount; | |
242 | } | |
243 | if (mpos > from && mpos <= to) | |
244 | mpos += amount; | |
245 | m->bufpos = mpos; | |
246 | marker = m->chain; | |
247 | } | |
248 | } | |
a27a38d8 | 249 | |
beecb55b RS |
250 | /* Adjust markers whose insertion-type is t |
251 | for an insertion of AMOUNT characters at POS. */ | |
252 | ||
253 | static void | |
254 | adjust_markers_for_insert (pos, amount) | |
255 | register int pos, amount; | |
256 | { | |
257 | Lisp_Object marker; | |
258 | ||
259 | marker = BUF_MARKERS (current_buffer); | |
260 | ||
261 | while (!NILP (marker)) | |
262 | { | |
263 | register struct Lisp_Marker *m = XMARKER (marker); | |
264 | if (m->insertion_type && m->bufpos == pos) | |
265 | m->bufpos += amount; | |
266 | marker = m->chain; | |
267 | } | |
268 | } | |
269 | ||
a27a38d8 KH |
270 | /* Add the specified amount to point. This is used only when the value |
271 | of point changes due to an insert or delete; it does not represent | |
272 | a conceptual change in point as a marker. In particular, point is | |
273 | not crossing any interval boundaries, so there's no need to use the | |
274 | usual SET_PT macro. In fact it would be incorrect to do so, because | |
8e6208c5 | 275 | either the old or the new value of point is out of sync with the |
a27a38d8 KH |
276 | current set of intervals. */ |
277 | static void | |
278 | adjust_point (amount) | |
29eb72ac | 279 | int amount; |
a27a38d8 | 280 | { |
9fbf87cd | 281 | BUF_PT (current_buffer) += amount; |
a27a38d8 | 282 | } |
b45433b3 JB |
283 | \f |
284 | /* Make the gap INCREMENT characters longer. */ | |
285 | ||
c660b094 | 286 | void |
b45433b3 JB |
287 | make_gap (increment) |
288 | int increment; | |
289 | { | |
290 | unsigned char *result; | |
291 | Lisp_Object tem; | |
292 | int real_gap_loc; | |
293 | int old_gap_size; | |
294 | ||
295 | /* If we have to get more space, get enough to last a while. */ | |
296 | increment += 2000; | |
297 | ||
94056516 RS |
298 | /* Don't allow a buffer size that won't fit in an int |
299 | even if it will fit in a Lisp integer. | |
300 | That won't work because so many places use `int'. */ | |
301 | ||
14f6194b | 302 | if (Z - BEG + GAP_SIZE + increment |
68be917d | 303 | >= ((unsigned) 1 << (min (BITS_PER_INT, VALBITS) - 1))) |
14f6194b | 304 | error ("Buffer exceeds maximum size"); |
94056516 | 305 | |
9ac0d9e0 | 306 | BLOCK_INPUT; |
b45433b3 | 307 | result = BUFFER_REALLOC (BEG_ADDR, (Z - BEG + GAP_SIZE + increment)); |
9ac0d9e0 | 308 | |
b45433b3 | 309 | if (result == 0) |
270c2138 RS |
310 | { |
311 | UNBLOCK_INPUT; | |
312 | memory_full (); | |
313 | } | |
314 | ||
315 | /* We can't unblock until the new address is properly stored. */ | |
b45433b3 | 316 | BEG_ADDR = result; |
270c2138 | 317 | UNBLOCK_INPUT; |
b45433b3 JB |
318 | |
319 | /* Prevent quitting in move_gap. */ | |
320 | tem = Vinhibit_quit; | |
321 | Vinhibit_quit = Qt; | |
322 | ||
323 | real_gap_loc = GPT; | |
324 | old_gap_size = GAP_SIZE; | |
325 | ||
326 | /* Call the newly allocated space a gap at the end of the whole space. */ | |
327 | GPT = Z + GAP_SIZE; | |
328 | GAP_SIZE = increment; | |
329 | ||
330 | /* Move the new gap down to be consecutive with the end of the old one. | |
331 | This adjusts the markers properly too. */ | |
332 | gap_left (real_gap_loc + old_gap_size, 1); | |
333 | ||
334 | /* Now combine the two into one large gap. */ | |
335 | GAP_SIZE += old_gap_size; | |
336 | GPT = real_gap_loc; | |
337 | ||
338 | Vinhibit_quit = tem; | |
339 | } | |
340 | \f | |
341 | /* Insert a string of specified length before point. | |
ef29f213 KH |
342 | DO NOT use this for the contents of a Lisp string or a Lisp buffer! |
343 | prepare_to_modify_buffer could relocate the text. */ | |
b45433b3 | 344 | |
c660b094 | 345 | void |
b45433b3 JB |
346 | insert (string, length) |
347 | register unsigned char *string; | |
348 | register length; | |
349 | { | |
395ec62e KH |
350 | if (length > 0) |
351 | { | |
c660b094 | 352 | insert_1 (string, length, 0, 1); |
cd11ef31 RS |
353 | signal_after_change (PT-length, 0, length); |
354 | } | |
355 | } | |
356 | ||
c660b094 | 357 | void |
cd11ef31 RS |
358 | insert_and_inherit (string, length) |
359 | register unsigned char *string; | |
360 | register length; | |
361 | { | |
362 | if (length > 0) | |
363 | { | |
c660b094 | 364 | insert_1 (string, length, 1, 1); |
2bcaed71 | 365 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
366 | } |
367 | } | |
b45433b3 | 368 | |
c660b094 KH |
369 | void |
370 | insert_1 (string, length, inherit, prepare) | |
395ec62e | 371 | register unsigned char *string; |
c660b094 KH |
372 | register int length; |
373 | int inherit, prepare; | |
395ec62e KH |
374 | { |
375 | register Lisp_Object temp; | |
b45433b3 | 376 | |
c660b094 KH |
377 | if (prepare) |
378 | prepare_to_modify_buffer (PT, PT); | |
b45433b3 | 379 | |
2bcaed71 KH |
380 | if (PT != GPT) |
381 | move_gap (PT); | |
b45433b3 JB |
382 | if (GAP_SIZE < length) |
383 | make_gap (length - GAP_SIZE); | |
384 | ||
2bcaed71 | 385 | record_insert (PT, length); |
b45433b3 JB |
386 | MODIFF++; |
387 | ||
388 | bcopy (string, GPT_ADDR, length); | |
389 | ||
648c4c55 | 390 | #ifdef USE_TEXT_PROPERTIES |
9fbf87cd | 391 | if (BUF_INTERVALS (current_buffer) != 0) |
648c4c55 RS |
392 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES. */ |
393 | offset_intervals (current_buffer, PT, length); | |
394 | #endif | |
679194a6 | 395 | |
b45433b3 JB |
396 | GAP_SIZE -= length; |
397 | GPT += length; | |
398 | ZV += length; | |
399 | Z += length; | |
adde4858 | 400 | adjust_overlays_for_insert (PT, length); |
beecb55b | 401 | adjust_markers_for_insert (PT, length); |
a27a38d8 | 402 | adjust_point (length); |
cd11ef31 | 403 | |
648c4c55 | 404 | #ifdef USE_TEXT_PROPERTIES |
9fbf87cd | 405 | if (!inherit && BUF_INTERVALS (current_buffer) != 0) |
cd11ef31 RS |
406 | Fset_text_properties (make_number (PT - length), make_number (PT), |
407 | Qnil, Qnil); | |
648c4c55 | 408 | #endif |
b45433b3 JB |
409 | } |
410 | ||
679194a6 JA |
411 | /* Insert the part of the text of STRING, a Lisp object assumed to be |
412 | of type string, consisting of the LENGTH characters starting at | |
413 | position POS. If the text of STRING has properties, they are absorbed | |
414 | into the buffer. | |
415 | ||
416 | It does not work to use `insert' for this, because a GC could happen | |
7e1ea612 JB |
417 | before we bcopy the stuff into the buffer, and relocate the string |
418 | without insert noticing. */ | |
679194a6 | 419 | |
c660b094 | 420 | void |
9391e591 | 421 | insert_from_string (string, pos, length, inherit) |
b45433b3 JB |
422 | Lisp_Object string; |
423 | register int pos, length; | |
9391e591 | 424 | int inherit; |
395ec62e KH |
425 | { |
426 | if (length > 0) | |
427 | { | |
428 | insert_from_string_1 (string, pos, length, inherit); | |
2bcaed71 | 429 | signal_after_change (PT-length, 0, length); |
395ec62e KH |
430 | } |
431 | } | |
432 | ||
433 | static void | |
434 | insert_from_string_1 (string, pos, length, inherit) | |
435 | Lisp_Object string; | |
436 | register int pos, length; | |
437 | int inherit; | |
b45433b3 JB |
438 | { |
439 | register Lisp_Object temp; | |
440 | struct gcpro gcpro1; | |
441 | ||
b45433b3 | 442 | /* Make sure point-max won't overflow after this insertion. */ |
eb7db9e6 | 443 | XSETINT (temp, length + Z); |
b45433b3 JB |
444 | if (length + Z != XINT (temp)) |
445 | error ("maximum buffer size exceeded"); | |
446 | ||
447 | GCPRO1 (string); | |
2bcaed71 | 448 | prepare_to_modify_buffer (PT, PT); |
b45433b3 | 449 | |
2bcaed71 KH |
450 | if (PT != GPT) |
451 | move_gap (PT); | |
b45433b3 JB |
452 | if (GAP_SIZE < length) |
453 | make_gap (length - GAP_SIZE); | |
454 | ||
2bcaed71 | 455 | record_insert (PT, length); |
b45433b3 JB |
456 | MODIFF++; |
457 | UNGCPRO; | |
458 | ||
459 | bcopy (XSTRING (string)->data, GPT_ADDR, length); | |
460 | ||
679194a6 | 461 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
2bcaed71 | 462 | offset_intervals (current_buffer, PT, length); |
679194a6 | 463 | |
b45433b3 JB |
464 | GAP_SIZE -= length; |
465 | GPT += length; | |
466 | ZV += length; | |
467 | Z += length; | |
adde4858 | 468 | adjust_overlays_for_insert (PT, length); |
beecb55b | 469 | adjust_markers_for_insert (PT, length); |
679194a6 JA |
470 | |
471 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ | |
2bcaed71 | 472 | graft_intervals_into_buffer (XSTRING (string)->intervals, PT, length, |
9391e591 | 473 | current_buffer, inherit); |
679194a6 | 474 | |
a27a38d8 | 475 | adjust_point (length); |
b45433b3 JB |
476 | } |
477 | ||
ef29f213 KH |
478 | /* Insert text from BUF, starting at POS and having length LENGTH, into the |
479 | current buffer. If the text in BUF has properties, they are absorbed | |
480 | into the current buffer. | |
481 | ||
482 | It does not work to use `insert' for this, because a malloc could happen | |
483 | and relocate BUF's text before the bcopy happens. */ | |
484 | ||
485 | void | |
486 | insert_from_buffer (buf, pos, length, inherit) | |
487 | struct buffer *buf; | |
488 | int pos, length; | |
489 | int inherit; | |
490 | { | |
491 | if (length > 0) | |
492 | { | |
493 | insert_from_buffer_1 (buf, pos, length, inherit); | |
494 | signal_after_change (PT-length, 0, length); | |
495 | } | |
496 | } | |
497 | ||
498 | static void | |
499 | insert_from_buffer_1 (buf, pos, length, inherit) | |
500 | struct buffer *buf; | |
501 | int pos, length; | |
502 | int inherit; | |
503 | { | |
504 | register Lisp_Object temp; | |
505 | int chunk; | |
506 | ||
507 | /* Make sure point-max won't overflow after this insertion. */ | |
508 | XSETINT (temp, length + Z); | |
509 | if (length + Z != XINT (temp)) | |
510 | error ("maximum buffer size exceeded"); | |
511 | ||
512 | prepare_to_modify_buffer (PT, PT); | |
513 | ||
514 | if (PT != GPT) | |
515 | move_gap (PT); | |
516 | if (GAP_SIZE < length) | |
517 | make_gap (length - GAP_SIZE); | |
518 | ||
519 | record_insert (PT, length); | |
520 | MODIFF++; | |
521 | ||
522 | if (pos < BUF_GPT (buf)) | |
523 | { | |
61bd0e9c RS |
524 | chunk = BUF_GPT (buf) - pos; |
525 | if (chunk > length) | |
526 | chunk = length; | |
ef29f213 KH |
527 | bcopy (BUF_CHAR_ADDRESS (buf, pos), GPT_ADDR, chunk); |
528 | } | |
529 | else | |
530 | chunk = 0; | |
531 | if (chunk < length) | |
532 | bcopy (BUF_CHAR_ADDRESS (buf, pos + chunk), | |
533 | GPT_ADDR + chunk, length - chunk); | |
534 | ||
535 | #ifdef USE_TEXT_PROPERTIES | |
9fbf87cd | 536 | if (BUF_INTERVALS (current_buffer) != 0) |
ef29f213 KH |
537 | offset_intervals (current_buffer, PT, length); |
538 | #endif | |
539 | ||
540 | GAP_SIZE -= length; | |
541 | GPT += length; | |
542 | ZV += length; | |
543 | Z += length; | |
adde4858 | 544 | adjust_overlays_for_insert (PT, length); |
beecb55b | 545 | adjust_markers_for_insert (PT, length); |
ef29f213 KH |
546 | adjust_point (length); |
547 | ||
548 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ | |
9fbf87cd RS |
549 | graft_intervals_into_buffer (copy_intervals (BUF_INTERVALS (buf), |
550 | pos, length), | |
ef29f213 KH |
551 | PT - length, length, current_buffer, inherit); |
552 | } | |
553 | ||
b45433b3 JB |
554 | /* Insert the character C before point */ |
555 | ||
556 | void | |
557 | insert_char (c) | |
558 | unsigned char c; | |
559 | { | |
560 | insert (&c, 1); | |
561 | } | |
562 | ||
563 | /* Insert the null-terminated string S before point */ | |
564 | ||
565 | void | |
566 | insert_string (s) | |
567 | char *s; | |
568 | { | |
569 | insert (s, strlen (s)); | |
570 | } | |
571 | ||
572 | /* Like `insert' except that all markers pointing at the place where | |
573 | the insertion happens are adjusted to point after it. | |
574 | Don't use this function to insert part of a Lisp string, | |
575 | since gc could happen and relocate it. */ | |
576 | ||
c660b094 | 577 | void |
b45433b3 JB |
578 | insert_before_markers (string, length) |
579 | unsigned char *string; | |
580 | register int length; | |
581 | { | |
395ec62e KH |
582 | if (length > 0) |
583 | { | |
2bcaed71 | 584 | register int opoint = PT; |
c660b094 | 585 | insert_1 (string, length, 0, 1); |
395ec62e | 586 | adjust_markers (opoint - 1, opoint, length); |
2bcaed71 | 587 | signal_after_change (PT-length, 0, length); |
395ec62e | 588 | } |
b45433b3 JB |
589 | } |
590 | ||
c660b094 | 591 | void |
598fb6fe RS |
592 | insert_before_markers_and_inherit (string, length) |
593 | unsigned char *string; | |
594 | register int length; | |
595 | { | |
596 | if (length > 0) | |
597 | { | |
598 | register int opoint = PT; | |
c660b094 | 599 | insert_1 (string, length, 1, 1); |
598fb6fe RS |
600 | adjust_markers (opoint - 1, opoint, length); |
601 | signal_after_change (PT-length, 0, length); | |
602 | } | |
603 | } | |
604 | ||
b45433b3 JB |
605 | /* Insert part of a Lisp string, relocating markers after. */ |
606 | ||
c660b094 | 607 | void |
9391e591 | 608 | insert_from_string_before_markers (string, pos, length, inherit) |
b45433b3 JB |
609 | Lisp_Object string; |
610 | register int pos, length; | |
9391e591 | 611 | int inherit; |
b45433b3 | 612 | { |
395ec62e KH |
613 | if (length > 0) |
614 | { | |
2bcaed71 | 615 | register int opoint = PT; |
395ec62e KH |
616 | insert_from_string_1 (string, pos, length, inherit); |
617 | adjust_markers (opoint - 1, opoint, length); | |
2bcaed71 | 618 | signal_after_change (PT-length, 0, length); |
395ec62e | 619 | } |
b45433b3 JB |
620 | } |
621 | \f | |
622 | /* Delete characters in current buffer | |
623 | from FROM up to (but not including) TO. */ | |
624 | ||
c660b094 | 625 | void |
b45433b3 JB |
626 | del_range (from, to) |
627 | register int from, to; | |
47c64747 | 628 | { |
c660b094 | 629 | del_range_1 (from, to, 1); |
47c64747 RS |
630 | } |
631 | ||
632 | /* Like del_range; PREPARE says whether to call prepare_to_modify_buffer. */ | |
633 | ||
c660b094 | 634 | void |
47c64747 RS |
635 | del_range_1 (from, to, prepare) |
636 | register int from, to, prepare; | |
b45433b3 JB |
637 | { |
638 | register int numdel; | |
639 | ||
640 | /* Make args be valid */ | |
641 | if (from < BEGV) | |
642 | from = BEGV; | |
643 | if (to > ZV) | |
644 | to = ZV; | |
645 | ||
646 | if ((numdel = to - from) <= 0) | |
647 | return; | |
648 | ||
649 | /* Make sure the gap is somewhere in or next to what we are deleting. */ | |
650 | if (from > GPT) | |
651 | gap_right (from); | |
652 | if (to < GPT) | |
653 | gap_left (to, 0); | |
654 | ||
47c64747 RS |
655 | if (prepare) |
656 | prepare_to_modify_buffer (from, to); | |
b45433b3 | 657 | |
be09561e RS |
658 | record_delete (from, numdel); |
659 | MODIFF++; | |
660 | ||
b45433b3 | 661 | /* Relocate point as if it were a marker. */ |
2bcaed71 | 662 | if (from < PT) |
a27a38d8 | 663 | adjust_point (from - (PT < to ? PT : to)); |
b45433b3 | 664 | |
16032db6 | 665 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
83010cd6 | 666 | offset_intervals (current_buffer, from, - numdel); |
16032db6 | 667 | |
b45433b3 JB |
668 | /* Relocate all markers pointing into the new, larger gap |
669 | to point at the end of the text before the gap. */ | |
670 | adjust_markers (to + GAP_SIZE, to + GAP_SIZE, - numdel - GAP_SIZE); | |
671 | ||
adde4858 | 672 | /* Adjust the overlay center as needed. This must be done after |
a7f38d28 | 673 | adjusting the markers that bound the overlays. */ |
adde4858 KH |
674 | adjust_overlays_for_delete (from, numdel); |
675 | ||
b45433b3 JB |
676 | GAP_SIZE += numdel; |
677 | ZV -= numdel; | |
678 | Z -= numdel; | |
679 | GPT = from; | |
680 | ||
681 | if (GPT - BEG < beg_unchanged) | |
682 | beg_unchanged = GPT - BEG; | |
683 | if (Z - GPT < end_unchanged) | |
684 | end_unchanged = Z - GPT; | |
685 | ||
d386034e | 686 | evaporate_overlays (from); |
b45433b3 JB |
687 | signal_after_change (from, numdel, 0); |
688 | } | |
689 | \f | |
04a759c8 JB |
690 | /* Call this if you're about to change the region of BUFFER from START |
691 | to END. This checks the read-only properties of the region, calls | |
692 | the necessary modification hooks, and warns the next redisplay that | |
693 | it should pay attention to that area. */ | |
c660b094 | 694 | void |
04a759c8 JB |
695 | modify_region (buffer, start, end) |
696 | struct buffer *buffer; | |
b45433b3 JB |
697 | int start, end; |
698 | { | |
04a759c8 JB |
699 | struct buffer *old_buffer = current_buffer; |
700 | ||
701 | if (buffer != old_buffer) | |
702 | set_buffer_internal (buffer); | |
703 | ||
b45433b3 JB |
704 | prepare_to_modify_buffer (start, end); |
705 | ||
706 | if (start - 1 < beg_unchanged || unchanged_modified == MODIFF) | |
707 | beg_unchanged = start - 1; | |
708 | if (Z - end < end_unchanged | |
709 | || unchanged_modified == MODIFF) | |
710 | end_unchanged = Z - end; | |
83010cd6 | 711 | |
9fbf87cd | 712 | if (MODIFF <= SAVE_MODIFF) |
83010cd6 | 713 | record_first_change (); |
b45433b3 | 714 | MODIFF++; |
04a759c8 | 715 | |
069cdc4f RS |
716 | buffer->point_before_scroll = Qnil; |
717 | ||
04a759c8 JB |
718 | if (buffer != old_buffer) |
719 | set_buffer_internal (old_buffer); | |
b45433b3 JB |
720 | } |
721 | ||
722 | /* Check that it is okay to modify the buffer between START and END. | |
679194a6 JA |
723 | Run the before-change-function, if any. If intervals are in use, |
724 | verify that the text to be modified is not read-only, and call | |
725 | any modification properties the text may have. */ | |
b45433b3 | 726 | |
c660b094 | 727 | void |
b45433b3 JB |
728 | prepare_to_modify_buffer (start, end) |
729 | Lisp_Object start, end; | |
730 | { | |
d427b66a | 731 | if (!NILP (current_buffer->read_only)) |
b45433b3 JB |
732 | Fbarf_if_buffer_read_only (); |
733 | ||
679194a6 | 734 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
9fbf87cd | 735 | if (BUF_INTERVALS (current_buffer) != 0) |
648c4c55 | 736 | verify_interval_modification (current_buffer, start, end); |
b45433b3 JB |
737 | |
738 | #ifdef CLASH_DETECTION | |
f173b650 | 739 | if (!NILP (current_buffer->file_truename) |
ab6c5c0c RS |
740 | /* Make binding buffer-file-name to nil effective. */ |
741 | && !NILP (current_buffer->filename) | |
9fbf87cd | 742 | && SAVE_MODIFF >= MODIFF) |
f173b650 | 743 | lock_file (current_buffer->file_truename); |
b45433b3 JB |
744 | #else |
745 | /* At least warn if this file has changed on disk since it was visited. */ | |
d427b66a | 746 | if (!NILP (current_buffer->filename) |
9fbf87cd | 747 | && SAVE_MODIFF >= MODIFF |
d427b66a JB |
748 | && NILP (Fverify_visited_file_modtime (Fcurrent_buffer ())) |
749 | && !NILP (Ffile_exists_p (current_buffer->filename))) | |
b45433b3 JB |
750 | call1 (intern ("ask-user-about-supersession-threat"), |
751 | current_buffer->filename); | |
752 | #endif /* not CLASH_DETECTION */ | |
753 | ||
754 | signal_before_change (start, end); | |
2f545eea | 755 | |
56e1065e JB |
756 | if (current_buffer->newline_cache) |
757 | invalidate_region_cache (current_buffer, | |
758 | current_buffer->newline_cache, | |
759 | start - BEG, Z - end); | |
760 | if (current_buffer->width_run_cache) | |
761 | invalidate_region_cache (current_buffer, | |
762 | current_buffer->width_run_cache, | |
763 | start - BEG, Z - end); | |
764 | ||
2f545eea | 765 | Vdeactivate_mark = Qt; |
b45433b3 JB |
766 | } |
767 | \f | |
eb8c3be9 | 768 | /* Signal a change to the buffer immediately before it happens. |
b45433b3 JB |
769 | START and END are the bounds of the text to be changed, |
770 | as Lisp objects. */ | |
771 | ||
c660b094 | 772 | void |
b45433b3 JB |
773 | signal_before_change (start, end) |
774 | Lisp_Object start, end; | |
775 | { | |
776 | /* If buffer is unmodified, run a special hook for that case. */ | |
9fbf87cd | 777 | if (SAVE_MODIFF >= MODIFF |
dbc4e1c1 JB |
778 | && !NILP (Vfirst_change_hook) |
779 | && !NILP (Vrun_hooks)) | |
780 | call1 (Vrun_hooks, Qfirst_change_hook); | |
781 | ||
3d1e2d9c RS |
782 | /* Run the before-change-function if any. |
783 | We don't bother "binding" this variable to nil | |
784 | because it is obsolete anyway and new code should not use it. */ | |
d427b66a | 785 | if (!NILP (Vbefore_change_function)) |
3d1e2d9c | 786 | call2 (Vbefore_change_function, start, end); |
e45fb8bf | 787 | |
3d1e2d9c | 788 | /* Now run the before-change-functions if any. */ |
e45fb8bf RS |
789 | if (!NILP (Vbefore_change_functions)) |
790 | { | |
3d1e2d9c RS |
791 | Lisp_Object args[3]; |
792 | Lisp_Object before_change_functions; | |
793 | Lisp_Object after_change_functions; | |
794 | struct gcpro gcpro1, gcpro2; | |
795 | ||
796 | /* "Bind" before-change-functions and after-change-functions | |
797 | to nil--but in a way that errors don't know about. | |
798 | That way, if there's an error in them, they will stay nil. */ | |
799 | before_change_functions = Vbefore_change_functions; | |
800 | after_change_functions = Vafter_change_functions; | |
c82c1da0 KH |
801 | Vbefore_change_functions = Qnil; |
802 | Vafter_change_functions = Qnil; | |
3d1e2d9c RS |
803 | GCPRO2 (before_change_functions, after_change_functions); |
804 | ||
805 | /* Actually run the hook functions. */ | |
806 | args[0] = Qbefore_change_functions; | |
807 | args[1] = start; | |
808 | args[2] = end; | |
809 | run_hook_list_with_args (before_change_functions, 3, args); | |
810 | ||
811 | /* "Unbind" the variables we "bound" to nil. */ | |
812 | Vbefore_change_functions = before_change_functions; | |
813 | Vafter_change_functions = after_change_functions; | |
814 | UNGCPRO; | |
e45fb8bf | 815 | } |
d07c0804 RS |
816 | |
817 | if (!NILP (current_buffer->overlays_before) | |
818 | || !NILP (current_buffer->overlays_after)) | |
835220e8 | 819 | report_overlay_modification (start, end, 0, start, end, Qnil); |
b45433b3 JB |
820 | } |
821 | ||
eb8c3be9 | 822 | /* Signal a change immediately after it happens. |
b45433b3 JB |
823 | POS is the address of the start of the changed text. |
824 | LENDEL is the number of characters of the text before the change. | |
825 | (Not the whole buffer; just the part that was changed.) | |
d07c0804 RS |
826 | LENINS is the number of characters in the changed text. |
827 | ||
828 | (Hence POS + LENINS - LENDEL is the position after the changed text.) */ | |
b45433b3 | 829 | |
c660b094 | 830 | void |
b45433b3 JB |
831 | signal_after_change (pos, lendel, lenins) |
832 | int pos, lendel, lenins; | |
833 | { | |
3d1e2d9c RS |
834 | /* Run the after-change-function if any. |
835 | We don't bother "binding" this variable to nil | |
836 | because it is obsolete anyway and new code should not use it. */ | |
d427b66a | 837 | if (!NILP (Vafter_change_function)) |
3d1e2d9c RS |
838 | call3 (Vafter_change_function, |
839 | make_number (pos), make_number (pos + lenins), | |
840 | make_number (lendel)); | |
b45433b3 | 841 | |
e45fb8bf RS |
842 | if (!NILP (Vafter_change_functions)) |
843 | { | |
3d1e2d9c RS |
844 | Lisp_Object args[4]; |
845 | Lisp_Object before_change_functions; | |
846 | Lisp_Object after_change_functions; | |
847 | struct gcpro gcpro1, gcpro2; | |
848 | ||
849 | /* "Bind" before-change-functions and after-change-functions | |
850 | to nil--but in a way that errors don't know about. | |
851 | That way, if there's an error in them, they will stay nil. */ | |
852 | before_change_functions = Vbefore_change_functions; | |
853 | after_change_functions = Vafter_change_functions; | |
c82c1da0 KH |
854 | Vbefore_change_functions = Qnil; |
855 | Vafter_change_functions = Qnil; | |
3d1e2d9c RS |
856 | GCPRO2 (before_change_functions, after_change_functions); |
857 | ||
858 | /* Actually run the hook functions. */ | |
859 | args[0] = Qafter_change_functions; | |
860 | XSETFASTINT (args[1], pos); | |
861 | XSETFASTINT (args[2], pos + lenins); | |
862 | XSETFASTINT (args[3], lendel); | |
863 | run_hook_list_with_args (after_change_functions, | |
864 | 4, args); | |
865 | ||
866 | /* "Unbind" the variables we "bound" to nil. */ | |
867 | Vbefore_change_functions = before_change_functions; | |
868 | Vafter_change_functions = after_change_functions; | |
869 | UNGCPRO; | |
e45fb8bf | 870 | } |
d07c0804 RS |
871 | |
872 | if (!NILP (current_buffer->overlays_before) | |
873 | || !NILP (current_buffer->overlays_after)) | |
835220e8 | 874 | report_overlay_modification (make_number (pos), |
d07c0804 RS |
875 | make_number (pos + lenins - lendel), |
876 | 1, | |
877 | make_number (pos), make_number (pos + lenins), | |
878 | make_number (lendel)); | |
c5ca0786 RS |
879 | |
880 | /* After an insertion, call the text properties | |
881 | insert-behind-hooks or insert-in-front-hooks. */ | |
882 | if (lendel == 0) | |
883 | report_interval_modification (pos, pos + lenins); | |
b45433b3 | 884 | } |