Commit | Line | Data |
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a50699fd | 1 | /* Code for doing intervals. |
31c8f881 | 2 | Copyright (C) 1993, 1994, 1995, 1997, 1998 Free Software Foundation, Inc. |
a50699fd JA |
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 | |
7ce503fd | 8 | the Free Software Foundation; either version 2, or (at your option) |
a50699fd JA |
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. */ | |
a50699fd JA |
20 | |
21 | ||
22 | /* NOTES: | |
23 | ||
24 | Have to ensure that we can't put symbol nil on a plist, or some | |
25 | functions may work incorrectly. | |
26 | ||
27 | An idea: Have the owner of the tree keep count of splits and/or | |
28 | insertion lengths (in intervals), and balance after every N. | |
29 | ||
30 | Need to call *_left_hook when buffer is killed. | |
31 | ||
32 | Scan for zero-length, or 0-length to see notes about handling | |
33 | zero length interval-markers. | |
34 | ||
35 | There are comments around about freeing intervals. It might be | |
36 | faster to explicitly free them (put them on the free list) than | |
37 | to GC them. | |
38 | ||
39 | */ | |
40 | ||
41 | ||
18160b98 | 42 | #include <config.h> |
a50699fd JA |
43 | #include "lisp.h" |
44 | #include "intervals.h" | |
45 | #include "buffer.h" | |
328c0f1f | 46 | #include "puresize.h" |
f54a8c1a | 47 | #include "keyboard.h" |
a50699fd | 48 | |
45d82bdc KH |
49 | /* Test for membership, allowing for t (actually any non-cons) to mean the |
50 | universal set. */ | |
51 | ||
52 | #define TMEM(sym, set) (CONSP (set) ? ! NILP (Fmemq (sym, set)) : ! NILP (set)) | |
53 | ||
d8638d30 RS |
54 | #define min(x, y) ((x) < (y) ? (x) : (y)) |
55 | ||
b5f37d3f | 56 | Lisp_Object merge_properties_sticky (); |
a50699fd | 57 | \f |
7ce503fd | 58 | /* Utility functions for intervals. */ |
a50699fd JA |
59 | |
60 | ||
7ce503fd | 61 | /* Create the root interval of some object, a buffer or string. */ |
a50699fd JA |
62 | |
63 | INTERVAL | |
64 | create_root_interval (parent) | |
65 | Lisp_Object parent; | |
66 | { | |
328c0f1f RS |
67 | INTERVAL new; |
68 | ||
69 | CHECK_IMPURE (parent); | |
70 | ||
71 | new = make_interval (); | |
a50699fd | 72 | |
b629dd47 | 73 | if (BUFFERP (parent)) |
a50699fd | 74 | { |
2bc7a79b JB |
75 | new->total_length = (BUF_Z (XBUFFER (parent)) |
76 | - BUF_BEG (XBUFFER (parent))); | |
e5d967c9 | 77 | BUF_INTERVALS (XBUFFER (parent)) = new; |
944d4e4b | 78 | new->position = 1; |
a50699fd | 79 | } |
b629dd47 | 80 | else if (STRINGP (parent)) |
a50699fd JA |
81 | { |
82 | new->total_length = XSTRING (parent)->size; | |
83 | XSTRING (parent)->intervals = new; | |
944d4e4b | 84 | new->position = 0; |
a50699fd JA |
85 | } |
86 | ||
2e34157c | 87 | new->parent = (INTERVAL) XFASTINT (parent); |
a50699fd JA |
88 | |
89 | return new; | |
90 | } | |
91 | ||
92 | /* Make the interval TARGET have exactly the properties of SOURCE */ | |
93 | ||
94 | void | |
95 | copy_properties (source, target) | |
96 | register INTERVAL source, target; | |
97 | { | |
98 | if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target)) | |
99 | return; | |
100 | ||
101 | COPY_INTERVAL_CACHE (source, target); | |
102 | target->plist = Fcopy_sequence (source->plist); | |
103 | } | |
104 | ||
105 | /* Merge the properties of interval SOURCE into the properties | |
323a7ad4 RS |
106 | of interval TARGET. That is to say, each property in SOURCE |
107 | is added to TARGET if TARGET has no such property as yet. */ | |
a50699fd JA |
108 | |
109 | static void | |
110 | merge_properties (source, target) | |
111 | register INTERVAL source, target; | |
112 | { | |
113 | register Lisp_Object o, sym, val; | |
114 | ||
115 | if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target)) | |
116 | return; | |
117 | ||
118 | MERGE_INTERVAL_CACHE (source, target); | |
119 | ||
120 | o = source->plist; | |
121 | while (! EQ (o, Qnil)) | |
122 | { | |
123 | sym = Fcar (o); | |
124 | val = Fmemq (sym, target->plist); | |
125 | ||
126 | if (NILP (val)) | |
127 | { | |
128 | o = Fcdr (o); | |
129 | val = Fcar (o); | |
130 | target->plist = Fcons (sym, Fcons (val, target->plist)); | |
131 | o = Fcdr (o); | |
132 | } | |
133 | else | |
134 | o = Fcdr (Fcdr (o)); | |
135 | } | |
136 | } | |
137 | ||
138 | /* Return 1 if the two intervals have the same properties, | |
7ce503fd | 139 | 0 otherwise. */ |
a50699fd JA |
140 | |
141 | int | |
142 | intervals_equal (i0, i1) | |
143 | INTERVAL i0, i1; | |
144 | { | |
145 | register Lisp_Object i0_cdr, i0_sym, i1_val; | |
dfcf069d | 146 | register int i1_len; |
a50699fd JA |
147 | |
148 | if (DEFAULT_INTERVAL_P (i0) && DEFAULT_INTERVAL_P (i1)) | |
149 | return 1; | |
150 | ||
323a7ad4 RS |
151 | if (DEFAULT_INTERVAL_P (i0) || DEFAULT_INTERVAL_P (i1)) |
152 | return 0; | |
153 | ||
a50699fd JA |
154 | i1_len = XFASTINT (Flength (i1->plist)); |
155 | if (i1_len & 0x1) /* Paranoia -- plists are always even */ | |
156 | abort (); | |
157 | i1_len /= 2; | |
158 | i0_cdr = i0->plist; | |
159 | while (!NILP (i0_cdr)) | |
160 | { | |
7ce503fd | 161 | /* Lengths of the two plists were unequal. */ |
a50699fd JA |
162 | if (i1_len == 0) |
163 | return 0; | |
164 | ||
165 | i0_sym = Fcar (i0_cdr); | |
166 | i1_val = Fmemq (i0_sym, i1->plist); | |
167 | ||
7ce503fd | 168 | /* i0 has something i1 doesn't. */ |
a50699fd JA |
169 | if (EQ (i1_val, Qnil)) |
170 | return 0; | |
171 | ||
7ce503fd | 172 | /* i0 and i1 both have sym, but it has different values in each. */ |
a50699fd | 173 | i0_cdr = Fcdr (i0_cdr); |
7ce503fd | 174 | if (! EQ (Fcar (Fcdr (i1_val)), Fcar (i0_cdr))) |
a50699fd JA |
175 | return 0; |
176 | ||
177 | i0_cdr = Fcdr (i0_cdr); | |
178 | i1_len--; | |
179 | } | |
180 | ||
7ce503fd | 181 | /* Lengths of the two plists were unequal. */ |
a50699fd JA |
182 | if (i1_len > 0) |
183 | return 0; | |
184 | ||
185 | return 1; | |
186 | } | |
187 | \f | |
a50699fd | 188 | |
a50699fd | 189 | /* Traverse an interval tree TREE, performing FUNCTION on each node. |
4a93c905 | 190 | Pass FUNCTION two args: an interval, and ARG. */ |
a50699fd JA |
191 | |
192 | void | |
4a93c905 | 193 | traverse_intervals (tree, position, depth, function, arg) |
a50699fd | 194 | INTERVAL tree; |
e0b63493 | 195 | int position, depth; |
0c60dfd7 | 196 | void (* function) P_ ((INTERVAL, Lisp_Object)); |
4a93c905 | 197 | Lisp_Object arg; |
a50699fd JA |
198 | { |
199 | if (NULL_INTERVAL_P (tree)) | |
200 | return; | |
201 | ||
323a7ad4 | 202 | traverse_intervals (tree->left, position, depth + 1, function, arg); |
a50699fd JA |
203 | position += LEFT_TOTAL_LENGTH (tree); |
204 | tree->position = position; | |
4a93c905 | 205 | (*function) (tree, arg); |
a50699fd | 206 | position += LENGTH (tree); |
323a7ad4 | 207 | traverse_intervals (tree->right, position, depth + 1, function, arg); |
a50699fd JA |
208 | } |
209 | \f | |
210 | #if 0 | |
e39adcda GM |
211 | |
212 | static int icount; | |
213 | static int idepth; | |
214 | static int zero_length; | |
215 | ||
7ce503fd | 216 | /* These functions are temporary, for debugging purposes only. */ |
a50699fd JA |
217 | |
218 | INTERVAL search_interval, found_interval; | |
219 | ||
220 | void | |
221 | check_for_interval (i) | |
222 | register INTERVAL i; | |
223 | { | |
224 | if (i == search_interval) | |
225 | { | |
226 | found_interval = i; | |
227 | icount++; | |
228 | } | |
229 | } | |
230 | ||
231 | INTERVAL | |
232 | search_for_interval (i, tree) | |
233 | register INTERVAL i, tree; | |
234 | { | |
235 | icount = 0; | |
236 | search_interval = i; | |
237 | found_interval = NULL_INTERVAL; | |
4a93c905 | 238 | traverse_intervals (tree, 1, 0, &check_for_interval, Qnil); |
a50699fd JA |
239 | return found_interval; |
240 | } | |
241 | ||
242 | static void | |
243 | inc_interval_count (i) | |
244 | INTERVAL i; | |
245 | { | |
246 | icount++; | |
247 | if (LENGTH (i) == 0) | |
248 | zero_length++; | |
249 | if (depth > idepth) | |
250 | idepth = depth; | |
251 | } | |
252 | ||
253 | int | |
254 | count_intervals (i) | |
255 | register INTERVAL i; | |
256 | { | |
257 | icount = 0; | |
258 | idepth = 0; | |
259 | zero_length = 0; | |
4a93c905 | 260 | traverse_intervals (i, 1, 0, &inc_interval_count, Qnil); |
a50699fd JA |
261 | |
262 | return icount; | |
263 | } | |
264 | ||
265 | static INTERVAL | |
266 | root_interval (interval) | |
267 | INTERVAL interval; | |
268 | { | |
269 | register INTERVAL i = interval; | |
270 | ||
271 | while (! ROOT_INTERVAL_P (i)) | |
272 | i = i->parent; | |
273 | ||
274 | return i; | |
275 | } | |
276 | #endif | |
277 | \f | |
278 | /* Assuming that a left child exists, perform the following operation: | |
279 | ||
280 | A B | |
281 | / \ / \ | |
282 | B => A | |
283 | / \ / \ | |
284 | c c | |
285 | */ | |
286 | ||
287 | static INTERVAL | |
288 | rotate_right (interval) | |
289 | INTERVAL interval; | |
290 | { | |
291 | INTERVAL i; | |
292 | INTERVAL B = interval->left; | |
4314dea4 | 293 | int old_total = interval->total_length; |
a50699fd | 294 | |
7ce503fd | 295 | /* Deal with any Parent of A; make it point to B. */ |
a50699fd | 296 | if (! ROOT_INTERVAL_P (interval)) |
e39adcda GM |
297 | { |
298 | if (AM_LEFT_CHILD (interval)) | |
299 | interval->parent->left = B; | |
300 | else | |
301 | interval->parent->right = B; | |
302 | } | |
4314dea4 | 303 | B->parent = interval->parent; |
a50699fd | 304 | |
4314dea4 RS |
305 | /* Make B the parent of A */ |
306 | i = B->right; | |
307 | B->right = interval; | |
308 | interval->parent = B; | |
a50699fd | 309 | |
4314dea4 | 310 | /* Make A point to c */ |
a50699fd JA |
311 | interval->left = i; |
312 | if (! NULL_INTERVAL_P (i)) | |
313 | i->parent = interval; | |
4314dea4 | 314 | |
550bd63a | 315 | /* A's total length is decreased by the length of B and its left child. */ |
4314dea4 RS |
316 | interval->total_length -= B->total_length - LEFT_TOTAL_LENGTH (interval); |
317 | ||
318 | /* B must have the same total length of A. */ | |
319 | B->total_length = old_total; | |
a50699fd JA |
320 | |
321 | return B; | |
322 | } | |
4314dea4 | 323 | |
a50699fd JA |
324 | /* Assuming that a right child exists, perform the following operation: |
325 | ||
326 | A B | |
327 | / \ / \ | |
328 | B => A | |
329 | / \ / \ | |
330 | c c | |
331 | */ | |
332 | ||
333 | static INTERVAL | |
334 | rotate_left (interval) | |
335 | INTERVAL interval; | |
336 | { | |
337 | INTERVAL i; | |
338 | INTERVAL B = interval->right; | |
4314dea4 | 339 | int old_total = interval->total_length; |
a50699fd | 340 | |
4314dea4 | 341 | /* Deal with any parent of A; make it point to B. */ |
a50699fd | 342 | if (! ROOT_INTERVAL_P (interval)) |
e39adcda GM |
343 | { |
344 | if (AM_LEFT_CHILD (interval)) | |
345 | interval->parent->left = B; | |
346 | else | |
347 | interval->parent->right = B; | |
348 | } | |
4314dea4 | 349 | B->parent = interval->parent; |
a50699fd JA |
350 | |
351 | /* Make B the parent of A */ | |
4314dea4 RS |
352 | i = B->left; |
353 | B->left = interval; | |
354 | interval->parent = B; | |
a50699fd JA |
355 | |
356 | /* Make A point to c */ | |
357 | interval->right = i; | |
358 | if (! NULL_INTERVAL_P (i)) | |
359 | i->parent = interval; | |
4314dea4 | 360 | |
550bd63a | 361 | /* A's total length is decreased by the length of B and its right child. */ |
4314dea4 RS |
362 | interval->total_length -= B->total_length - RIGHT_TOTAL_LENGTH (interval); |
363 | ||
364 | /* B must have the same total length of A. */ | |
365 | B->total_length = old_total; | |
a50699fd JA |
366 | |
367 | return B; | |
368 | } | |
369 | \f | |
4314dea4 RS |
370 | /* Balance an interval tree with the assumption that the subtrees |
371 | themselves are already balanced. */ | |
372 | ||
373 | static INTERVAL | |
374 | balance_an_interval (i) | |
375 | INTERVAL i; | |
376 | { | |
377 | register int old_diff, new_diff; | |
378 | ||
379 | while (1) | |
380 | { | |
381 | old_diff = LEFT_TOTAL_LENGTH (i) - RIGHT_TOTAL_LENGTH (i); | |
382 | if (old_diff > 0) | |
383 | { | |
384 | new_diff = i->total_length - i->left->total_length | |
385 | + RIGHT_TOTAL_LENGTH (i->left) - LEFT_TOTAL_LENGTH (i->left); | |
386 | if (abs (new_diff) >= old_diff) | |
387 | break; | |
388 | i = rotate_right (i); | |
389 | balance_an_interval (i->right); | |
390 | } | |
391 | else if (old_diff < 0) | |
392 | { | |
393 | new_diff = i->total_length - i->right->total_length | |
394 | + LEFT_TOTAL_LENGTH (i->right) - RIGHT_TOTAL_LENGTH (i->right); | |
395 | if (abs (new_diff) >= -old_diff) | |
396 | break; | |
397 | i = rotate_left (i); | |
398 | balance_an_interval (i->left); | |
399 | } | |
400 | else | |
401 | break; | |
402 | } | |
403 | return i; | |
404 | } | |
405 | ||
406 | /* Balance INTERVAL, potentially stuffing it back into its parent | |
407 | Lisp Object. */ | |
408 | ||
409 | static INLINE INTERVAL | |
410 | balance_possible_root_interval (interval) | |
411 | register INTERVAL interval; | |
412 | { | |
413 | Lisp_Object parent; | |
414 | ||
415 | if (interval->parent == NULL_INTERVAL) | |
416 | return interval; | |
417 | ||
2e34157c | 418 | XSETFASTINT (parent, (EMACS_INT) interval->parent); |
4314dea4 RS |
419 | interval = balance_an_interval (interval); |
420 | ||
b629dd47 | 421 | if (BUFFERP (parent)) |
e5d967c9 | 422 | BUF_INTERVALS (XBUFFER (parent)) = interval; |
b629dd47 | 423 | else if (STRINGP (parent)) |
4314dea4 RS |
424 | XSTRING (parent)->intervals = interval; |
425 | ||
426 | return interval; | |
427 | } | |
428 | ||
429 | /* Balance the interval tree TREE. Balancing is by weight | |
430 | (the amount of text). */ | |
431 | ||
432 | static INTERVAL | |
433 | balance_intervals_internal (tree) | |
434 | register INTERVAL tree; | |
435 | { | |
436 | /* Balance within each side. */ | |
437 | if (tree->left) | |
8f3b9b95 | 438 | balance_intervals_internal (tree->left); |
4314dea4 | 439 | if (tree->right) |
8f3b9b95 | 440 | balance_intervals_internal (tree->right); |
4314dea4 RS |
441 | return balance_an_interval (tree); |
442 | } | |
443 | ||
444 | /* Advertised interface to balance intervals. */ | |
445 | ||
446 | INTERVAL | |
447 | balance_intervals (tree) | |
448 | INTERVAL tree; | |
449 | { | |
450 | if (tree == NULL_INTERVAL) | |
451 | return NULL_INTERVAL; | |
452 | ||
453 | return balance_intervals_internal (tree); | |
454 | } | |
455 | \f | |
2bc7a79b JB |
456 | /* Split INTERVAL into two pieces, starting the second piece at |
457 | character position OFFSET (counting from 0), relative to INTERVAL. | |
458 | INTERVAL becomes the left-hand piece, and the right-hand piece | |
459 | (second, lexicographically) is returned. | |
90ba40fc JA |
460 | |
461 | The size and position fields of the two intervals are set based upon | |
462 | those of the original interval. The property list of the new interval | |
463 | is reset, thus it is up to the caller to do the right thing with the | |
464 | result. | |
a50699fd JA |
465 | |
466 | Note that this does not change the position of INTERVAL; if it is a root, | |
7ce503fd | 467 | it is still a root after this operation. */ |
a50699fd JA |
468 | |
469 | INTERVAL | |
90ba40fc | 470 | split_interval_right (interval, offset) |
a50699fd | 471 | INTERVAL interval; |
90ba40fc | 472 | int offset; |
a50699fd JA |
473 | { |
474 | INTERVAL new = make_interval (); | |
475 | int position = interval->position; | |
2bc7a79b | 476 | int new_length = LENGTH (interval) - offset; |
a50699fd | 477 | |
2bc7a79b | 478 | new->position = position + offset; |
a50699fd | 479 | new->parent = interval; |
a50699fd | 480 | |
4314dea4 | 481 | if (NULL_RIGHT_CHILD (interval)) |
a50699fd JA |
482 | { |
483 | interval->right = new; | |
484 | new->total_length = new_length; | |
a50699fd | 485 | } |
cc6e2aaa RS |
486 | else |
487 | { | |
488 | /* Insert the new node between INTERVAL and its right child. */ | |
489 | new->right = interval->right; | |
490 | interval->right->parent = new; | |
491 | interval->right = new; | |
492 | new->total_length = new_length + new->right->total_length; | |
493 | balance_an_interval (new); | |
494 | } | |
495 | ||
4314dea4 RS |
496 | balance_possible_root_interval (interval); |
497 | ||
a50699fd JA |
498 | return new; |
499 | } | |
500 | ||
2bc7a79b JB |
501 | /* Split INTERVAL into two pieces, starting the second piece at |
502 | character position OFFSET (counting from 0), relative to INTERVAL. | |
503 | INTERVAL becomes the right-hand piece, and the left-hand piece | |
504 | (first, lexicographically) is returned. | |
a50699fd | 505 | |
90ba40fc JA |
506 | The size and position fields of the two intervals are set based upon |
507 | those of the original interval. The property list of the new interval | |
508 | is reset, thus it is up to the caller to do the right thing with the | |
509 | result. | |
510 | ||
511 | Note that this does not change the position of INTERVAL; if it is a root, | |
7ce503fd | 512 | it is still a root after this operation. */ |
a50699fd JA |
513 | |
514 | INTERVAL | |
90ba40fc | 515 | split_interval_left (interval, offset) |
a50699fd | 516 | INTERVAL interval; |
90ba40fc | 517 | int offset; |
a50699fd JA |
518 | { |
519 | INTERVAL new = make_interval (); | |
2bc7a79b | 520 | int new_length = offset; |
a50699fd | 521 | |
a50699fd | 522 | new->position = interval->position; |
2bc7a79b | 523 | interval->position = interval->position + offset; |
a50699fd JA |
524 | new->parent = interval; |
525 | ||
526 | if (NULL_LEFT_CHILD (interval)) | |
527 | { | |
528 | interval->left = new; | |
529 | new->total_length = new_length; | |
a50699fd | 530 | } |
cc6e2aaa RS |
531 | else |
532 | { | |
533 | /* Insert the new node between INTERVAL and its left child. */ | |
534 | new->left = interval->left; | |
535 | new->left->parent = new; | |
536 | interval->left = new; | |
537 | new->total_length = new_length + new->left->total_length; | |
538 | balance_an_interval (new); | |
539 | } | |
540 | ||
4314dea4 | 541 | balance_possible_root_interval (interval); |
a50699fd JA |
542 | |
543 | return new; | |
544 | } | |
545 | \f | |
944d4e4b KH |
546 | /* Return the proper position for the first character |
547 | described by the interval tree SOURCE. | |
548 | This is 1 if the parent is a buffer, | |
549 | 0 if the parent is a string or if there is no parent. | |
550 | ||
551 | Don't use this function on an interval which is the child | |
552 | of another interval! */ | |
553 | ||
554 | int | |
555 | interval_start_pos (source) | |
556 | INTERVAL source; | |
557 | { | |
558 | Lisp_Object parent; | |
559 | ||
560 | if (NULL_INTERVAL_P (source)) | |
561 | return 0; | |
562 | ||
563 | XSETFASTINT (parent, (EMACS_INT) source->parent); | |
564 | if (BUFFERP (parent)) | |
565 | return BUF_BEG (XBUFFER (parent)); | |
566 | return 0; | |
567 | } | |
568 | ||
90ba40fc | 569 | /* Find the interval containing text position POSITION in the text |
24e3d3bf | 570 | represented by the interval tree TREE. POSITION is a buffer |
944d4e4b KH |
571 | position (starting from 1) or a string index (starting from 0). |
572 | If POSITION is at the end of the buffer or string, | |
573 | return the interval containing the last character. | |
a50699fd | 574 | |
90ba40fc JA |
575 | The `position' field, which is a cache of an interval's position, |
576 | is updated in the interval found. Other functions (e.g., next_interval) | |
7ce503fd | 577 | will update this cache based on the result of find_interval. */ |
90ba40fc | 578 | |
1863bbf8 | 579 | INTERVAL |
a50699fd JA |
580 | find_interval (tree, position) |
581 | register INTERVAL tree; | |
582 | register int position; | |
583 | { | |
24e3d3bf JB |
584 | /* The distance from the left edge of the subtree at TREE |
585 | to POSITION. */ | |
944d4e4b KH |
586 | register int relative_position; |
587 | Lisp_Object parent; | |
a50699fd JA |
588 | |
589 | if (NULL_INTERVAL_P (tree)) | |
590 | return NULL_INTERVAL; | |
591 | ||
944d4e4b KH |
592 | XSETFASTINT (parent, (EMACS_INT) tree->parent); |
593 | relative_position = position; | |
594 | if (BUFFERP (parent)) | |
595 | relative_position -= BUF_BEG (XBUFFER (parent)); | |
596 | ||
24e3d3bf | 597 | if (relative_position > TOTAL_LENGTH (tree)) |
a50699fd | 598 | abort (); /* Paranoia */ |
a50699fd | 599 | |
4314dea4 RS |
600 | tree = balance_possible_root_interval (tree); |
601 | ||
a50699fd JA |
602 | while (1) |
603 | { | |
24e3d3bf | 604 | if (relative_position < LEFT_TOTAL_LENGTH (tree)) |
a50699fd JA |
605 | { |
606 | tree = tree->left; | |
607 | } | |
24e3d3bf JB |
608 | else if (! NULL_RIGHT_CHILD (tree) |
609 | && relative_position >= (TOTAL_LENGTH (tree) | |
610 | - RIGHT_TOTAL_LENGTH (tree))) | |
a50699fd JA |
611 | { |
612 | relative_position -= (TOTAL_LENGTH (tree) | |
613 | - RIGHT_TOTAL_LENGTH (tree)); | |
614 | tree = tree->right; | |
615 | } | |
616 | else | |
617 | { | |
944d4e4b KH |
618 | tree->position |
619 | = (position - relative_position /* the left edge of *tree */ | |
620 | + LEFT_TOTAL_LENGTH (tree)); /* the left edge of this interval */ | |
24e3d3bf | 621 | |
a50699fd JA |
622 | return tree; |
623 | } | |
624 | } | |
625 | } | |
626 | \f | |
627 | /* Find the succeeding interval (lexicographically) to INTERVAL. | |
90ba40fc | 628 | Sets the `position' field based on that of INTERVAL (see |
7ce503fd | 629 | find_interval). */ |
a50699fd JA |
630 | |
631 | INTERVAL | |
632 | next_interval (interval) | |
633 | register INTERVAL interval; | |
634 | { | |
635 | register INTERVAL i = interval; | |
636 | register int next_position; | |
637 | ||
638 | if (NULL_INTERVAL_P (i)) | |
639 | return NULL_INTERVAL; | |
640 | next_position = interval->position + LENGTH (interval); | |
641 | ||
642 | if (! NULL_RIGHT_CHILD (i)) | |
643 | { | |
644 | i = i->right; | |
645 | while (! NULL_LEFT_CHILD (i)) | |
646 | i = i->left; | |
647 | ||
648 | i->position = next_position; | |
649 | return i; | |
650 | } | |
651 | ||
652 | while (! NULL_PARENT (i)) | |
653 | { | |
654 | if (AM_LEFT_CHILD (i)) | |
655 | { | |
656 | i = i->parent; | |
657 | i->position = next_position; | |
658 | return i; | |
659 | } | |
660 | ||
661 | i = i->parent; | |
662 | } | |
663 | ||
664 | return NULL_INTERVAL; | |
665 | } | |
666 | ||
667 | /* Find the preceding interval (lexicographically) to INTERVAL. | |
90ba40fc | 668 | Sets the `position' field based on that of INTERVAL (see |
7ce503fd | 669 | find_interval). */ |
a50699fd JA |
670 | |
671 | INTERVAL | |
672 | previous_interval (interval) | |
673 | register INTERVAL interval; | |
674 | { | |
675 | register INTERVAL i; | |
a50699fd JA |
676 | |
677 | if (NULL_INTERVAL_P (interval)) | |
678 | return NULL_INTERVAL; | |
679 | ||
680 | if (! NULL_LEFT_CHILD (interval)) | |
681 | { | |
682 | i = interval->left; | |
683 | while (! NULL_RIGHT_CHILD (i)) | |
684 | i = i->right; | |
685 | ||
686 | i->position = interval->position - LENGTH (i); | |
687 | return i; | |
688 | } | |
689 | ||
690 | i = interval; | |
691 | while (! NULL_PARENT (i)) | |
692 | { | |
693 | if (AM_RIGHT_CHILD (i)) | |
694 | { | |
695 | i = i->parent; | |
696 | ||
697 | i->position = interval->position - LENGTH (i); | |
698 | return i; | |
699 | } | |
700 | i = i->parent; | |
701 | } | |
702 | ||
703 | return NULL_INTERVAL; | |
704 | } | |
25eeac41 RS |
705 | |
706 | /* Find the interval containing POS given some non-NULL INTERVAL | |
75167cd4 RS |
707 | in the same tree. Note that we need to update interval->position |
708 | if we go down the tree. */ | |
25eeac41 RS |
709 | INTERVAL |
710 | update_interval (i, pos) | |
711 | register INTERVAL i; | |
712 | int pos; | |
713 | { | |
714 | if (NULL_INTERVAL_P (i)) | |
715 | return NULL_INTERVAL; | |
716 | ||
717 | while (1) | |
718 | { | |
719 | if (pos < i->position) | |
720 | { | |
721 | /* Move left. */ | |
75167cd4 RS |
722 | if (pos >= i->position - TOTAL_LENGTH (i->left)) |
723 | { | |
724 | i->left->position = i->position - TOTAL_LENGTH (i->left) | |
725 | + LEFT_TOTAL_LENGTH (i->left); | |
726 | i = i->left; /* Move to the left child */ | |
727 | } | |
25eeac41 RS |
728 | else if (NULL_PARENT (i)) |
729 | error ("Point before start of properties"); | |
75167cd4 RS |
730 | else |
731 | i = i->parent; | |
25eeac41 RS |
732 | continue; |
733 | } | |
734 | else if (pos >= INTERVAL_LAST_POS (i)) | |
735 | { | |
736 | /* Move right. */ | |
75167cd4 RS |
737 | if (pos < INTERVAL_LAST_POS (i) + TOTAL_LENGTH (i->right)) |
738 | { | |
739 | i->right->position = INTERVAL_LAST_POS (i) + | |
740 | LEFT_TOTAL_LENGTH (i->right); | |
741 | i = i->right; /* Move to the right child */ | |
742 | } | |
25eeac41 RS |
743 | else if (NULL_PARENT (i)) |
744 | error ("Point after end of properties"); | |
745 | else | |
75167cd4 | 746 | i = i->parent; |
25eeac41 RS |
747 | continue; |
748 | } | |
749 | else | |
750 | return i; | |
751 | } | |
752 | } | |
753 | ||
a50699fd | 754 | \f |
90ba40fc | 755 | #if 0 |
a50699fd JA |
756 | /* Traverse a path down the interval tree TREE to the interval |
757 | containing POSITION, adjusting all nodes on the path for | |
758 | an addition of LENGTH characters. Insertion between two intervals | |
759 | (i.e., point == i->position, where i is second interval) means | |
760 | text goes into second interval. | |
761 | ||
762 | Modifications are needed to handle the hungry bits -- after simply | |
763 | finding the interval at position (don't add length going down), | |
764 | if it's the beginning of the interval, get the previous interval | |
8e6208c5 | 765 | and check the hungry bits of both. Then add the length going back up |
7ce503fd | 766 | to the root. */ |
a50699fd JA |
767 | |
768 | static INTERVAL | |
769 | adjust_intervals_for_insertion (tree, position, length) | |
770 | INTERVAL tree; | |
771 | int position, length; | |
772 | { | |
773 | register int relative_position; | |
774 | register INTERVAL this; | |
775 | ||
776 | if (TOTAL_LENGTH (tree) == 0) /* Paranoia */ | |
777 | abort (); | |
778 | ||
779 | /* If inserting at point-max of a buffer, that position | |
780 | will be out of range */ | |
781 | if (position > TOTAL_LENGTH (tree)) | |
782 | position = TOTAL_LENGTH (tree); | |
783 | relative_position = position; | |
784 | this = tree; | |
785 | ||
786 | while (1) | |
787 | { | |
788 | if (relative_position <= LEFT_TOTAL_LENGTH (this)) | |
789 | { | |
790 | this->total_length += length; | |
791 | this = this->left; | |
792 | } | |
793 | else if (relative_position > (TOTAL_LENGTH (this) | |
794 | - RIGHT_TOTAL_LENGTH (this))) | |
795 | { | |
796 | relative_position -= (TOTAL_LENGTH (this) | |
797 | - RIGHT_TOTAL_LENGTH (this)); | |
798 | this->total_length += length; | |
799 | this = this->right; | |
800 | } | |
801 | else | |
802 | { | |
803 | /* If we are to use zero-length intervals as buffer pointers, | |
7ce503fd | 804 | then this code will have to change. */ |
a50699fd JA |
805 | this->total_length += length; |
806 | this->position = LEFT_TOTAL_LENGTH (this) | |
807 | + position - relative_position + 1; | |
808 | return tree; | |
809 | } | |
810 | } | |
811 | } | |
90ba40fc JA |
812 | #endif |
813 | ||
814 | /* Effect an adjustment corresponding to the addition of LENGTH characters | |
815 | of text. Do this by finding the interval containing POSITION in the | |
550bd63a | 816 | interval tree TREE, and then adjusting all of its ancestors by adding |
90ba40fc JA |
817 | LENGTH to them. |
818 | ||
819 | If POSITION is the first character of an interval, meaning that point | |
820 | is actually between the two intervals, make the new text belong to | |
821 | the interval which is "sticky". | |
822 | ||
1d1d7ba0 | 823 | If both intervals are "sticky", then make them belong to the left-most |
90ba40fc | 824 | interval. Another possibility would be to create a new interval for |
7ce503fd | 825 | this text, and make it have the merged properties of both ends. */ |
90ba40fc JA |
826 | |
827 | static INTERVAL | |
828 | adjust_intervals_for_insertion (tree, position, length) | |
829 | INTERVAL tree; | |
830 | int position, length; | |
831 | { | |
832 | register INTERVAL i; | |
7ce503fd RS |
833 | register INTERVAL temp; |
834 | int eobp = 0; | |
944d4e4b KH |
835 | Lisp_Object parent; |
836 | int offset; | |
7ce503fd | 837 | |
90ba40fc JA |
838 | if (TOTAL_LENGTH (tree) == 0) /* Paranoia */ |
839 | abort (); | |
840 | ||
944d4e4b KH |
841 | XSETFASTINT (parent, (EMACS_INT) tree->parent); |
842 | offset = (BUFFERP (parent) ? BUF_BEG (XBUFFER (parent)) : 0); | |
843 | ||
24e3d3bf JB |
844 | /* If inserting at point-max of a buffer, that position will be out |
845 | of range. Remember that buffer positions are 1-based. */ | |
944d4e4b KH |
846 | if (position >= TOTAL_LENGTH (tree) + offset) |
847 | { | |
848 | position = TOTAL_LENGTH (tree) + offset; | |
849 | eobp = 1; | |
850 | } | |
90ba40fc JA |
851 | |
852 | i = find_interval (tree, position); | |
7ce503fd | 853 | |
2313b945 RS |
854 | /* If in middle of an interval which is not sticky either way, |
855 | we must not just give its properties to the insertion. | |
856 | So split this interval at the insertion point. */ | |
857 | if (! (position == i->position || eobp) | |
858 | && END_NONSTICKY_P (i) | |
ca41a64d | 859 | && FRONT_NONSTICKY_P (i)) |
2313b945 | 860 | { |
ca41a64d RS |
861 | Lisp_Object tail; |
862 | Lisp_Object front, rear; | |
863 | ||
864 | front = textget (i->plist, Qfront_sticky); | |
865 | rear = textget (i->plist, Qrear_nonsticky); | |
866 | ||
867 | /* Does any actual property pose an actual problem? */ | |
868 | for (tail = i->plist; ! NILP (tail); tail = Fcdr (Fcdr (tail))) | |
869 | { | |
870 | Lisp_Object prop; | |
03699b14 | 871 | prop = XCAR (tail); |
ca41a64d RS |
872 | |
873 | /* Is this particular property rear-sticky? | |
874 | Note, if REAR isn't a cons, it must be non-nil, | |
875 | which means that all properties are rear-nonsticky. */ | |
876 | if (CONSP (rear) && NILP (Fmemq (prop, rear))) | |
877 | continue; | |
878 | ||
879 | /* Is this particular property front-sticky? | |
880 | Note, if FRONT isn't a cons, it must be nil, | |
881 | which means that all properties are front-nonsticky. */ | |
882 | if (CONSP (front) && ! NILP (Fmemq (prop, front))) | |
883 | continue; | |
884 | ||
885 | /* PROP isn't sticky on either side => it is a real problem. */ | |
886 | break; | |
887 | } | |
888 | ||
889 | /* If any property is a real problem, split the interval. */ | |
890 | if (! NILP (tail)) | |
891 | { | |
892 | temp = split_interval_right (i, position - i->position); | |
893 | copy_properties (i, temp); | |
894 | i = temp; | |
895 | } | |
2313b945 RS |
896 | } |
897 | ||
90ba40fc | 898 | /* If we are positioned between intervals, check the stickiness of |
7ce503fd RS |
899 | both of them. We have to do this too, if we are at BEG or Z. */ |
900 | if (position == i->position || eobp) | |
90ba40fc | 901 | { |
7ce503fd RS |
902 | register INTERVAL prev; |
903 | ||
904 | if (position == BEG) | |
905 | prev = 0; | |
906 | else if (eobp) | |
907 | { | |
908 | prev = i; | |
909 | i = 0; | |
910 | } | |
911 | else | |
912 | prev = previous_interval (i); | |
90ba40fc | 913 | |
7ce503fd RS |
914 | /* Even if we are positioned between intervals, we default |
915 | to the left one if it exists. We extend it now and split | |
8e6208c5 | 916 | off a part later, if stickiness demands it. */ |
4314dea4 RS |
917 | for (temp = prev ? prev : i;! NULL_INTERVAL_P (temp); temp = temp->parent) |
918 | { | |
919 | temp->total_length += length; | |
920 | temp = balance_possible_root_interval (temp); | |
921 | } | |
7ce503fd RS |
922 | |
923 | /* If at least one interval has sticky properties, | |
8e6208c5 | 924 | we check the stickiness property by property. */ |
7ce503fd RS |
925 | if (END_NONSTICKY_P (prev) || FRONT_STICKY_P (i)) |
926 | { | |
dd675b05 | 927 | Lisp_Object pleft, pright; |
7ce503fd RS |
928 | struct interval newi; |
929 | ||
dd675b05 KH |
930 | pleft = NULL_INTERVAL_P (prev) ? Qnil : prev->plist; |
931 | pright = NULL_INTERVAL_P (i) ? Qnil : i->plist; | |
7ce503fd RS |
932 | newi.plist = merge_properties_sticky (pleft, pright); |
933 | ||
ef1900f3 | 934 | if (! prev) /* i.e. position == BEG */ |
7ce503fd RS |
935 | { |
936 | if (! intervals_equal (i, &newi)) | |
937 | { | |
938 | i = split_interval_left (i, length); | |
939 | i->plist = newi.plist; | |
940 | } | |
941 | } | |
942 | else if (! intervals_equal (prev, &newi)) | |
943 | { | |
944 | prev = split_interval_right (prev, | |
945 | position - prev->position); | |
946 | prev->plist = newi.plist; | |
947 | if (! NULL_INTERVAL_P (i) | |
948 | && intervals_equal (prev, i)) | |
949 | merge_interval_right (prev); | |
950 | } | |
951 | ||
952 | /* We will need to update the cache here later. */ | |
953 | } | |
954 | else if (! prev && ! NILP (i->plist)) | |
955 | { | |
956 | /* Just split off a new interval at the left. | |
957 | Since I wasn't front-sticky, the empty plist is ok. */ | |
958 | i = split_interval_left (i, length); | |
959 | } | |
90ba40fc JA |
960 | } |
961 | ||
7ce503fd RS |
962 | /* Otherwise just extend the interval. */ |
963 | else | |
90ba40fc | 964 | { |
7ce503fd | 965 | for (temp = i; ! NULL_INTERVAL_P (temp); temp = temp->parent) |
4314dea4 RS |
966 | { |
967 | temp->total_length += length; | |
968 | temp = balance_possible_root_interval (temp); | |
969 | } | |
90ba40fc | 970 | } |
7ce503fd | 971 | |
90ba40fc JA |
972 | return tree; |
973 | } | |
7ce503fd | 974 | |
45d82bdc KH |
975 | /* Any property might be front-sticky on the left, rear-sticky on the left, |
976 | front-sticky on the right, or rear-sticky on the right; the 16 combinations | |
977 | can be arranged in a matrix with rows denoting the left conditions and | |
978 | columns denoting the right conditions: | |
979 | _ __ _ | |
980 | _ FR FR FR FR | |
981 | FR__ 0 1 2 3 | |
982 | _FR 4 5 6 7 | |
983 | FR 8 9 A B | |
984 | FR C D E F | |
985 | ||
986 | left-props = '(front-sticky (p8 p9 pa pb pc pd pe pf) | |
987 | rear-nonsticky (p4 p5 p6 p7 p8 p9 pa pb) | |
988 | p0 L p1 L p2 L p3 L p4 L p5 L p6 L p7 L | |
989 | p8 L p9 L pa L pb L pc L pd L pe L pf L) | |
990 | right-props = '(front-sticky (p2 p3 p6 p7 pa pb pe pf) | |
991 | rear-nonsticky (p1 p2 p5 p6 p9 pa pd pe) | |
992 | p0 R p1 R p2 R p3 R p4 R p5 R p6 R p7 R | |
993 | p8 R p9 R pa R pb R pc R pd R pe R pf R) | |
994 | ||
995 | We inherit from whoever has a sticky side facing us. If both sides | |
996 | do (cases 2, 3, E, and F), then we inherit from whichever side has a | |
997 | non-nil value for the current property. If both sides do, then we take | |
998 | from the left. | |
999 | ||
1000 | When we inherit a property, we get its stickiness as well as its value. | |
1001 | So, when we merge the above two lists, we expect to get this: | |
1002 | ||
1003 | result = '(front-sticky (p6 p7 pa pb pc pd pe pf) | |
1004 | rear-nonsticky (p6 pa) | |
1005 | p0 L p1 L p2 L p3 L p6 R p7 R | |
1006 | pa R pb R pc L pd L pe L pf L) | |
1007 | ||
1008 | The optimizable special cases are: | |
1009 | left rear-nonsticky = nil, right front-sticky = nil (inherit left) | |
1010 | left rear-nonsticky = t, right front-sticky = t (inherit right) | |
1011 | left rear-nonsticky = t, right front-sticky = nil (inherit none) | |
1012 | */ | |
1013 | ||
7ce503fd RS |
1014 | Lisp_Object |
1015 | merge_properties_sticky (pleft, pright) | |
1016 | Lisp_Object pleft, pright; | |
1017 | { | |
dd675b05 KH |
1018 | register Lisp_Object props, front, rear; |
1019 | Lisp_Object lfront, lrear, rfront, rrear; | |
4ab19eb3 | 1020 | register Lisp_Object tail1, tail2, sym, lval, rval, cat; |
45d82bdc | 1021 | int use_left, use_right; |
4ab19eb3 | 1022 | int lpresent; |
7ce503fd | 1023 | |
dd675b05 KH |
1024 | props = Qnil; |
1025 | front = Qnil; | |
1026 | rear = Qnil; | |
1027 | lfront = textget (pleft, Qfront_sticky); | |
1028 | lrear = textget (pleft, Qrear_nonsticky); | |
1029 | rfront = textget (pright, Qfront_sticky); | |
1030 | rrear = textget (pright, Qrear_nonsticky); | |
1031 | ||
45d82bdc KH |
1032 | /* Go through each element of PRIGHT. */ |
1033 | for (tail1 = pright; ! NILP (tail1); tail1 = Fcdr (Fcdr (tail1))) | |
7ce503fd RS |
1034 | { |
1035 | sym = Fcar (tail1); | |
1036 | ||
1037 | /* Sticky properties get special treatment. */ | |
1038 | if (EQ (sym, Qrear_nonsticky) || EQ (sym, Qfront_sticky)) | |
1039 | continue; | |
45d82bdc KH |
1040 | |
1041 | rval = Fcar (Fcdr (tail1)); | |
1042 | for (tail2 = pleft; ! NILP (tail2); tail2 = Fcdr (Fcdr (tail2))) | |
1043 | if (EQ (sym, Fcar (tail2))) | |
1044 | break; | |
45d82bdc | 1045 | |
4ab19eb3 RS |
1046 | /* Indicate whether the property is explicitly defined on the left. |
1047 | (We know it is defined explicitly on the right | |
1048 | because otherwise we don't get here.) */ | |
1049 | lpresent = ! NILP (tail2); | |
1050 | lval = (NILP (tail2) ? Qnil : Fcar (Fcdr (tail2))); | |
1051 | ||
1052 | use_left = ! TMEM (sym, lrear) && lpresent; | |
45d82bdc KH |
1053 | use_right = TMEM (sym, rfront); |
1054 | if (use_left && use_right) | |
1055 | { | |
4ab19eb3 RS |
1056 | if (NILP (lval)) |
1057 | use_left = 0; | |
1058 | else if (NILP (rval)) | |
1059 | use_right = 0; | |
45d82bdc KH |
1060 | } |
1061 | if (use_left) | |
7ce503fd | 1062 | { |
45d82bdc KH |
1063 | /* We build props as (value sym ...) rather than (sym value ...) |
1064 | because we plan to nreverse it when we're done. */ | |
4ab19eb3 | 1065 | props = Fcons (lval, Fcons (sym, props)); |
45d82bdc | 1066 | if (TMEM (sym, lfront)) |
7ce503fd | 1067 | front = Fcons (sym, front); |
45d82bdc KH |
1068 | if (TMEM (sym, lrear)) |
1069 | rear = Fcons (sym, rear); | |
7ce503fd | 1070 | } |
45d82bdc | 1071 | else if (use_right) |
7ce503fd | 1072 | { |
4ab19eb3 | 1073 | props = Fcons (rval, Fcons (sym, props)); |
45d82bdc KH |
1074 | if (TMEM (sym, rfront)) |
1075 | front = Fcons (sym, front); | |
1076 | if (TMEM (sym, rrear)) | |
1077 | rear = Fcons (sym, rear); | |
7ce503fd RS |
1078 | } |
1079 | } | |
45d82bdc KH |
1080 | |
1081 | /* Now go through each element of PLEFT. */ | |
1082 | for (tail2 = pleft; ! NILP (tail2); tail2 = Fcdr (Fcdr (tail2))) | |
7ce503fd RS |
1083 | { |
1084 | sym = Fcar (tail2); | |
1085 | ||
1086 | /* Sticky properties get special treatment. */ | |
1087 | if (EQ (sym, Qrear_nonsticky) || EQ (sym, Qfront_sticky)) | |
1088 | continue; | |
1089 | ||
45d82bdc KH |
1090 | /* If sym is in PRIGHT, we've already considered it. */ |
1091 | for (tail1 = pright; ! NILP (tail1); tail1 = Fcdr (Fcdr (tail1))) | |
7ce503fd RS |
1092 | if (EQ (sym, Fcar (tail1))) |
1093 | break; | |
45d82bdc KH |
1094 | if (! NILP (tail1)) |
1095 | continue; | |
1096 | ||
1097 | lval = Fcar (Fcdr (tail2)); | |
1098 | ||
1099 | /* Since rval is known to be nil in this loop, the test simplifies. */ | |
1100 | if (! TMEM (sym, lrear)) | |
7ce503fd | 1101 | { |
4ab19eb3 | 1102 | props = Fcons (lval, Fcons (sym, props)); |
45d82bdc KH |
1103 | if (TMEM (sym, lfront)) |
1104 | front = Fcons (sym, front); | |
1105 | } | |
1106 | else if (TMEM (sym, rfront)) | |
1107 | { | |
1108 | /* The value is nil, but we still inherit the stickiness | |
1109 | from the right. */ | |
7ce503fd | 1110 | front = Fcons (sym, front); |
45d82bdc | 1111 | if (TMEM (sym, rrear)) |
7ce503fd RS |
1112 | rear = Fcons (sym, rear); |
1113 | } | |
1114 | } | |
550bd63a | 1115 | props = Fnreverse (props); |
7ce503fd | 1116 | if (! NILP (rear)) |
550bd63a | 1117 | props = Fcons (Qrear_nonsticky, Fcons (Fnreverse (rear), props)); |
4ab19eb3 RS |
1118 | |
1119 | cat = textget (props, Qcategory); | |
1120 | if (! NILP (front) | |
1121 | && | |
1122 | /* If we have inherited a front-stick category property that is t, | |
1123 | we don't need to set up a detailed one. */ | |
1124 | ! (! NILP (cat) && SYMBOLP (cat) | |
1125 | && EQ (Fget (cat, Qfront_sticky), Qt))) | |
45d82bdc | 1126 | props = Fcons (Qfront_sticky, Fcons (Fnreverse (front), props)); |
7ce503fd | 1127 | return props; |
7ce503fd RS |
1128 | } |
1129 | ||
a50699fd | 1130 | \f |
90ba40fc JA |
1131 | /* Delete an node I from its interval tree by merging its subtrees |
1132 | into one subtree which is then returned. Caller is responsible for | |
7ce503fd | 1133 | storing the resulting subtree into its parent. */ |
a50699fd JA |
1134 | |
1135 | static INTERVAL | |
1136 | delete_node (i) | |
1137 | register INTERVAL i; | |
1138 | { | |
1139 | register INTERVAL migrate, this; | |
1140 | register int migrate_amt; | |
1141 | ||
1142 | if (NULL_INTERVAL_P (i->left)) | |
1143 | return i->right; | |
1144 | if (NULL_INTERVAL_P (i->right)) | |
1145 | return i->left; | |
1146 | ||
1147 | migrate = i->left; | |
1148 | migrate_amt = i->left->total_length; | |
1149 | this = i->right; | |
1150 | this->total_length += migrate_amt; | |
1151 | while (! NULL_INTERVAL_P (this->left)) | |
1152 | { | |
1153 | this = this->left; | |
1154 | this->total_length += migrate_amt; | |
1155 | } | |
1156 | this->left = migrate; | |
1157 | migrate->parent = this; | |
1158 | ||
1159 | return i->right; | |
1160 | } | |
1161 | ||
1162 | /* Delete interval I from its tree by calling `delete_node' | |
1163 | and properly connecting the resultant subtree. | |
1164 | ||
1165 | I is presumed to be empty; that is, no adjustments are made | |
7ce503fd | 1166 | for the length of I. */ |
a50699fd JA |
1167 | |
1168 | void | |
1169 | delete_interval (i) | |
1170 | register INTERVAL i; | |
1171 | { | |
1172 | register INTERVAL parent; | |
1173 | int amt = LENGTH (i); | |
1174 | ||
7ce503fd | 1175 | if (amt > 0) /* Only used on zero-length intervals now. */ |
a50699fd JA |
1176 | abort (); |
1177 | ||
1178 | if (ROOT_INTERVAL_P (i)) | |
1179 | { | |
dd675b05 | 1180 | Lisp_Object owner; |
2e34157c | 1181 | XSETFASTINT (owner, (EMACS_INT) i->parent); |
a50699fd JA |
1182 | parent = delete_node (i); |
1183 | if (! NULL_INTERVAL_P (parent)) | |
2e34157c | 1184 | parent->parent = (INTERVAL) XFASTINT (owner); |
a50699fd | 1185 | |
b629dd47 | 1186 | if (BUFFERP (owner)) |
e5d967c9 | 1187 | BUF_INTERVALS (XBUFFER (owner)) = parent; |
b629dd47 | 1188 | else if (STRINGP (owner)) |
a50699fd JA |
1189 | XSTRING (owner)->intervals = parent; |
1190 | else | |
1191 | abort (); | |
1192 | ||
1193 | return; | |
1194 | } | |
1195 | ||
1196 | parent = i->parent; | |
1197 | if (AM_LEFT_CHILD (i)) | |
1198 | { | |
1199 | parent->left = delete_node (i); | |
1200 | if (! NULL_INTERVAL_P (parent->left)) | |
1201 | parent->left->parent = parent; | |
1202 | } | |
1203 | else | |
1204 | { | |
1205 | parent->right = delete_node (i); | |
1206 | if (! NULL_INTERVAL_P (parent->right)) | |
1207 | parent->right->parent = parent; | |
1208 | } | |
1209 | } | |
1210 | \f | |
24e3d3bf JB |
1211 | /* Find the interval in TREE corresponding to the relative position |
1212 | FROM and delete as much as possible of AMOUNT from that interval. | |
1213 | Return the amount actually deleted, and if the interval was | |
1214 | zeroed-out, delete that interval node from the tree. | |
1215 | ||
1216 | Note that FROM is actually origin zero, aka relative to the | |
1217 | leftmost edge of tree. This is appropriate since we call ourselves | |
1218 | recursively on subtrees. | |
a50699fd | 1219 | |
1d1d7ba0 | 1220 | Do this by recursing down TREE to the interval in question, and |
7ce503fd | 1221 | deleting the appropriate amount of text. */ |
a50699fd JA |
1222 | |
1223 | static int | |
1224 | interval_deletion_adjustment (tree, from, amount) | |
1225 | register INTERVAL tree; | |
1226 | register int from, amount; | |
1227 | { | |
1228 | register int relative_position = from; | |
1229 | ||
1230 | if (NULL_INTERVAL_P (tree)) | |
1231 | return 0; | |
1232 | ||
1233 | /* Left branch */ | |
24e3d3bf | 1234 | if (relative_position < LEFT_TOTAL_LENGTH (tree)) |
a50699fd JA |
1235 | { |
1236 | int subtract = interval_deletion_adjustment (tree->left, | |
1237 | relative_position, | |
1238 | amount); | |
1239 | tree->total_length -= subtract; | |
1240 | return subtract; | |
1241 | } | |
1242 | /* Right branch */ | |
24e3d3bf JB |
1243 | else if (relative_position >= (TOTAL_LENGTH (tree) |
1244 | - RIGHT_TOTAL_LENGTH (tree))) | |
a50699fd JA |
1245 | { |
1246 | int subtract; | |
1247 | ||
1248 | relative_position -= (tree->total_length | |
1249 | - RIGHT_TOTAL_LENGTH (tree)); | |
1250 | subtract = interval_deletion_adjustment (tree->right, | |
1251 | relative_position, | |
1252 | amount); | |
1253 | tree->total_length -= subtract; | |
1254 | return subtract; | |
1255 | } | |
7ce503fd | 1256 | /* Here -- this node. */ |
a50699fd JA |
1257 | else |
1258 | { | |
24e3d3bf JB |
1259 | /* How much can we delete from this interval? */ |
1260 | int my_amount = ((tree->total_length | |
1261 | - RIGHT_TOTAL_LENGTH (tree)) | |
1262 | - relative_position); | |
1263 | ||
1264 | if (amount > my_amount) | |
1265 | amount = my_amount; | |
1266 | ||
1267 | tree->total_length -= amount; | |
1268 | if (LENGTH (tree) == 0) | |
1269 | delete_interval (tree); | |
1270 | ||
1271 | return amount; | |
a50699fd JA |
1272 | } |
1273 | ||
7ce503fd | 1274 | /* Never reach here. */ |
a50699fd JA |
1275 | } |
1276 | ||
24e3d3bf JB |
1277 | /* Effect the adjustments necessary to the interval tree of BUFFER to |
1278 | correspond to the deletion of LENGTH characters from that buffer | |
1279 | text. The deletion is effected at position START (which is a | |
7ce503fd | 1280 | buffer position, i.e. origin 1). */ |
1d1d7ba0 | 1281 | |
a50699fd JA |
1282 | static void |
1283 | adjust_intervals_for_deletion (buffer, start, length) | |
1284 | struct buffer *buffer; | |
1285 | int start, length; | |
1286 | { | |
1287 | register int left_to_delete = length; | |
e5d967c9 | 1288 | register INTERVAL tree = BUF_INTERVALS (buffer); |
944d4e4b KH |
1289 | Lisp_Object parent; |
1290 | int offset; | |
1291 | ||
1292 | XSETFASTINT (parent, (EMACS_INT) tree->parent); | |
1293 | offset = (BUFFERP (parent) ? BUF_BEG (XBUFFER (parent)) : 0); | |
a50699fd JA |
1294 | |
1295 | if (NULL_INTERVAL_P (tree)) | |
1296 | return; | |
1297 | ||
944d4e4b KH |
1298 | if (start > offset + TOTAL_LENGTH (tree) |
1299 | || start + length > offset + TOTAL_LENGTH (tree)) | |
24e3d3bf JB |
1300 | abort (); |
1301 | ||
a50699fd JA |
1302 | if (length == TOTAL_LENGTH (tree)) |
1303 | { | |
e5d967c9 | 1304 | BUF_INTERVALS (buffer) = NULL_INTERVAL; |
a50699fd JA |
1305 | return; |
1306 | } | |
1307 | ||
1308 | if (ONLY_INTERVAL_P (tree)) | |
1309 | { | |
1310 | tree->total_length -= length; | |
1311 | return; | |
1312 | } | |
1313 | ||
944d4e4b KH |
1314 | if (start > offset + TOTAL_LENGTH (tree)) |
1315 | start = offset + TOTAL_LENGTH (tree); | |
a50699fd JA |
1316 | while (left_to_delete > 0) |
1317 | { | |
944d4e4b | 1318 | left_to_delete -= interval_deletion_adjustment (tree, start - offset, |
a50699fd | 1319 | left_to_delete); |
e5d967c9 | 1320 | tree = BUF_INTERVALS (buffer); |
a50699fd JA |
1321 | if (left_to_delete == tree->total_length) |
1322 | { | |
e5d967c9 | 1323 | BUF_INTERVALS (buffer) = NULL_INTERVAL; |
a50699fd JA |
1324 | return; |
1325 | } | |
1326 | } | |
1327 | } | |
1328 | \f | |
eb8c3be9 | 1329 | /* Make the adjustments necessary to the interval tree of BUFFER to |
1d1d7ba0 JA |
1330 | represent an addition or deletion of LENGTH characters starting |
1331 | at position START. Addition or deletion is indicated by the sign | |
7ce503fd | 1332 | of LENGTH. */ |
a50699fd JA |
1333 | |
1334 | INLINE void | |
1335 | offset_intervals (buffer, start, length) | |
1336 | struct buffer *buffer; | |
1337 | int start, length; | |
1338 | { | |
e5d967c9 | 1339 | if (NULL_INTERVAL_P (BUF_INTERVALS (buffer)) || length == 0) |
a50699fd JA |
1340 | return; |
1341 | ||
1342 | if (length > 0) | |
e5d967c9 | 1343 | adjust_intervals_for_insertion (BUF_INTERVALS (buffer), start, length); |
a50699fd JA |
1344 | else |
1345 | adjust_intervals_for_deletion (buffer, start, -length); | |
1346 | } | |
9c79dd1b JA |
1347 | \f |
1348 | /* Merge interval I with its lexicographic successor. The resulting | |
1349 | interval is returned, and has the properties of the original | |
1350 | successor. The properties of I are lost. I is removed from the | |
1351 | interval tree. | |
1352 | ||
1353 | IMPORTANT: | |
1354 | The caller must verify that this is not the last (rightmost) | |
7ce503fd | 1355 | interval. */ |
9c79dd1b JA |
1356 | |
1357 | INTERVAL | |
1358 | merge_interval_right (i) | |
1359 | register INTERVAL i; | |
1360 | { | |
1361 | register int absorb = LENGTH (i); | |
1362 | register INTERVAL successor; | |
1363 | ||
7ce503fd | 1364 | /* Zero out this interval. */ |
9c79dd1b JA |
1365 | i->total_length -= absorb; |
1366 | ||
7ce503fd | 1367 | /* Find the succeeding interval. */ |
9c79dd1b | 1368 | if (! NULL_RIGHT_CHILD (i)) /* It's below us. Add absorb |
7ce503fd | 1369 | as we descend. */ |
9c79dd1b JA |
1370 | { |
1371 | successor = i->right; | |
1372 | while (! NULL_LEFT_CHILD (successor)) | |
1373 | { | |
1374 | successor->total_length += absorb; | |
1375 | successor = successor->left; | |
1376 | } | |
1377 | ||
1378 | successor->total_length += absorb; | |
1379 | delete_interval (i); | |
1380 | return successor; | |
1381 | } | |
1382 | ||
1383 | successor = i; | |
1384 | while (! NULL_PARENT (successor)) /* It's above us. Subtract as | |
7ce503fd | 1385 | we ascend. */ |
9c79dd1b JA |
1386 | { |
1387 | if (AM_LEFT_CHILD (successor)) | |
1388 | { | |
1389 | successor = successor->parent; | |
1390 | delete_interval (i); | |
1391 | return successor; | |
1392 | } | |
1393 | ||
1394 | successor = successor->parent; | |
1395 | successor->total_length -= absorb; | |
1396 | } | |
1397 | ||
1398 | /* This must be the rightmost or last interval and cannot | |
7ce503fd | 1399 | be merged right. The caller should have known. */ |
9c79dd1b JA |
1400 | abort (); |
1401 | } | |
1402 | \f | |
1403 | /* Merge interval I with its lexicographic predecessor. The resulting | |
1404 | interval is returned, and has the properties of the original predecessor. | |
1405 | The properties of I are lost. Interval node I is removed from the tree. | |
1406 | ||
1407 | IMPORTANT: | |
7ce503fd | 1408 | The caller must verify that this is not the first (leftmost) interval. */ |
9c79dd1b JA |
1409 | |
1410 | INTERVAL | |
1411 | merge_interval_left (i) | |
1412 | register INTERVAL i; | |
1413 | { | |
1414 | register int absorb = LENGTH (i); | |
1415 | register INTERVAL predecessor; | |
1416 | ||
7ce503fd | 1417 | /* Zero out this interval. */ |
9c79dd1b JA |
1418 | i->total_length -= absorb; |
1419 | ||
7ce503fd | 1420 | /* Find the preceding interval. */ |
9c79dd1b | 1421 | if (! NULL_LEFT_CHILD (i)) /* It's below us. Go down, |
7ce503fd | 1422 | adding ABSORB as we go. */ |
9c79dd1b JA |
1423 | { |
1424 | predecessor = i->left; | |
1425 | while (! NULL_RIGHT_CHILD (predecessor)) | |
1426 | { | |
1427 | predecessor->total_length += absorb; | |
1428 | predecessor = predecessor->right; | |
1429 | } | |
1430 | ||
1431 | predecessor->total_length += absorb; | |
1432 | delete_interval (i); | |
1433 | return predecessor; | |
1434 | } | |
1435 | ||
1436 | predecessor = i; | |
1437 | while (! NULL_PARENT (predecessor)) /* It's above us. Go up, | |
7ce503fd | 1438 | subtracting ABSORB. */ |
9c79dd1b JA |
1439 | { |
1440 | if (AM_RIGHT_CHILD (predecessor)) | |
1441 | { | |
1442 | predecessor = predecessor->parent; | |
1443 | delete_interval (i); | |
1444 | return predecessor; | |
1445 | } | |
1446 | ||
1447 | predecessor = predecessor->parent; | |
1448 | predecessor->total_length -= absorb; | |
1449 | } | |
a50699fd | 1450 | |
9c79dd1b | 1451 | /* This must be the leftmost or first interval and cannot |
7ce503fd | 1452 | be merged left. The caller should have known. */ |
9c79dd1b JA |
1453 | abort (); |
1454 | } | |
1455 | \f | |
1d1d7ba0 JA |
1456 | /* Make an exact copy of interval tree SOURCE which descends from |
1457 | PARENT. This is done by recursing through SOURCE, copying | |
1458 | the current interval and its properties, and then adjusting | |
7ce503fd | 1459 | the pointers of the copy. */ |
1d1d7ba0 | 1460 | |
a50699fd JA |
1461 | static INTERVAL |
1462 | reproduce_tree (source, parent) | |
1463 | INTERVAL source, parent; | |
1464 | { | |
1465 | register INTERVAL t = make_interval (); | |
1466 | ||
1467 | bcopy (source, t, INTERVAL_SIZE); | |
1468 | copy_properties (source, t); | |
1469 | t->parent = parent; | |
1470 | if (! NULL_LEFT_CHILD (source)) | |
1471 | t->left = reproduce_tree (source->left, t); | |
1472 | if (! NULL_RIGHT_CHILD (source)) | |
1473 | t->right = reproduce_tree (source->right, t); | |
1474 | ||
1475 | return t; | |
1476 | } | |
1477 | ||
24e3d3bf JB |
1478 | #if 0 |
1479 | /* Nobody calls this. Perhaps it's a vestige of an earlier design. */ | |
1480 | ||
1d1d7ba0 JA |
1481 | /* Make a new interval of length LENGTH starting at START in the |
1482 | group of intervals INTERVALS, which is actually an interval tree. | |
1483 | Returns the new interval. | |
1484 | ||
1485 | Generate an error if the new positions would overlap an existing | |
7ce503fd | 1486 | interval. */ |
1d1d7ba0 | 1487 | |
a50699fd JA |
1488 | static INTERVAL |
1489 | make_new_interval (intervals, start, length) | |
1490 | INTERVAL intervals; | |
1491 | int start, length; | |
1492 | { | |
1493 | INTERVAL slot; | |
1494 | ||
1495 | slot = find_interval (intervals, start); | |
1496 | if (start + length > slot->position + LENGTH (slot)) | |
1497 | error ("Interval would overlap"); | |
1498 | ||
1499 | if (start == slot->position && length == LENGTH (slot)) | |
1500 | return slot; | |
1501 | ||
1502 | if (slot->position == start) | |
1503 | { | |
7ce503fd | 1504 | /* New right node. */ |
2bc7a79b | 1505 | split_interval_right (slot, length); |
a50699fd JA |
1506 | return slot; |
1507 | } | |
1508 | ||
1509 | if (slot->position + LENGTH (slot) == start + length) | |
1510 | { | |
7ce503fd | 1511 | /* New left node. */ |
2bc7a79b | 1512 | split_interval_left (slot, LENGTH (slot) - length); |
a50699fd JA |
1513 | return slot; |
1514 | } | |
1515 | ||
7ce503fd | 1516 | /* Convert interval SLOT into three intervals. */ |
2bc7a79b JB |
1517 | split_interval_left (slot, start - slot->position); |
1518 | split_interval_right (slot, length); | |
a50699fd JA |
1519 | return slot; |
1520 | } | |
24e3d3bf | 1521 | #endif |
294efdbe | 1522 | \f |
9c79dd1b | 1523 | /* Insert the intervals of SOURCE into BUFFER at POSITION. |
0b79989f | 1524 | LENGTH is the length of the text in SOURCE. |
a50699fd | 1525 | |
944d4e4b KH |
1526 | The `position' field of the SOURCE intervals is assumed to be |
1527 | consistent with its parent; therefore, SOURCE must be an | |
1528 | interval tree made with copy_interval or must be the whole | |
1529 | tree of a buffer or a string. | |
1530 | ||
2bc7a79b JB |
1531 | This is used in insdel.c when inserting Lisp_Strings into the |
1532 | buffer. The text corresponding to SOURCE is already in the buffer | |
1533 | when this is called. The intervals of new tree are a copy of those | |
1534 | belonging to the string being inserted; intervals are never | |
1535 | shared. | |
a50699fd | 1536 | |
0b79989f RS |
1537 | If the inserted text had no intervals associated, and we don't |
1538 | want to inherit the surrounding text's properties, this function | |
a50699fd | 1539 | simply returns -- offset_intervals should handle placing the |
90ba40fc | 1540 | text in the correct interval, depending on the sticky bits. |
a50699fd JA |
1541 | |
1542 | If the inserted text had properties (intervals), then there are two | |
1543 | cases -- either insertion happened in the middle of some interval, | |
1544 | or between two intervals. | |
1545 | ||
1546 | If the text goes into the middle of an interval, then new | |
1547 | intervals are created in the middle with only the properties of | |
1548 | the new text, *unless* the macro MERGE_INSERTIONS is true, in | |
1549 | which case the new text has the union of its properties and those | |
1550 | of the text into which it was inserted. | |
1551 | ||
1552 | If the text goes between two intervals, then if neither interval | |
90ba40fc JA |
1553 | had its appropriate sticky property set (front_sticky, rear_sticky), |
1554 | the new text has only its properties. If one of the sticky properties | |
a50699fd | 1555 | is set, then the new text "sticks" to that region and its properties |
eb8c3be9 | 1556 | depend on merging as above. If both the preceding and succeeding |
90ba40fc JA |
1557 | intervals to the new text are "sticky", then the new text retains |
1558 | only its properties, as if neither sticky property were set. Perhaps | |
a50699fd | 1559 | we should consider merging all three sets of properties onto the new |
7ce503fd | 1560 | text... */ |
a50699fd JA |
1561 | |
1562 | void | |
0b79989f | 1563 | graft_intervals_into_buffer (source, position, length, buffer, inherit) |
9c79dd1b | 1564 | INTERVAL source; |
0b79989f | 1565 | int position, length; |
9c79dd1b | 1566 | struct buffer *buffer; |
7ea69158 | 1567 | int inherit; |
a50699fd | 1568 | { |
323a7ad4 | 1569 | register INTERVAL under, over, this, prev; |
e5d967c9 | 1570 | register INTERVAL tree; |
323a7ad4 | 1571 | int middle; |
a50699fd | 1572 | |
e5d967c9 RS |
1573 | tree = BUF_INTERVALS (buffer); |
1574 | ||
a50699fd | 1575 | /* If the new text has no properties, it becomes part of whatever |
7ce503fd | 1576 | interval it was inserted into. */ |
9c79dd1b | 1577 | if (NULL_INTERVAL_P (source)) |
0b79989f RS |
1578 | { |
1579 | Lisp_Object buf; | |
08b05272 | 1580 | if (!inherit && ! NULL_INTERVAL_P (tree)) |
0b79989f | 1581 | { |
6445414a | 1582 | int saved_inhibit_modification_hooks = inhibit_modification_hooks; |
55cfc731 | 1583 | XSETBUFFER (buf, buffer); |
6445414a | 1584 | inhibit_modification_hooks = 1; |
0b79989f RS |
1585 | Fset_text_properties (make_number (position), |
1586 | make_number (position + length), | |
1587 | Qnil, buf); | |
6445414a | 1588 | inhibit_modification_hooks = saved_inhibit_modification_hooks; |
0b79989f | 1589 | } |
e5d967c9 RS |
1590 | if (! NULL_INTERVAL_P (BUF_INTERVALS (buffer))) |
1591 | BUF_INTERVALS (buffer) = balance_an_interval (BUF_INTERVALS (buffer)); | |
0b79989f RS |
1592 | return; |
1593 | } | |
a50699fd | 1594 | |
a50699fd JA |
1595 | if (NULL_INTERVAL_P (tree)) |
1596 | { | |
1597 | /* The inserted text constitutes the whole buffer, so | |
7ce503fd | 1598 | simply copy over the interval structure. */ |
2bc7a79b | 1599 | if ((BUF_Z (buffer) - BUF_BEG (buffer)) == TOTAL_LENGTH (source)) |
a50699fd | 1600 | { |
b8e4857c | 1601 | Lisp_Object buf; |
55cfc731 | 1602 | XSETBUFFER (buf, buffer); |
e5d967c9 | 1603 | BUF_INTERVALS (buffer) = reproduce_tree (source, buf); |
944d4e4b KH |
1604 | BUF_INTERVALS (buffer)->position = 1; |
1605 | ||
1606 | /* Explicitly free the old tree here? */ | |
a50699fd JA |
1607 | |
1608 | return; | |
1609 | } | |
1610 | ||
1611 | /* Create an interval tree in which to place a copy | |
7ce503fd | 1612 | of the intervals of the inserted string. */ |
a50699fd | 1613 | { |
249a6da9 | 1614 | Lisp_Object buf; |
55cfc731 | 1615 | XSETBUFFER (buf, buffer); |
323a7ad4 | 1616 | tree = create_root_interval (buf); |
a50699fd JA |
1617 | } |
1618 | } | |
7ea69158 RS |
1619 | else if (TOTAL_LENGTH (tree) == TOTAL_LENGTH (source)) |
1620 | /* If the buffer contains only the new string, but | |
1621 | there was already some interval tree there, then it may be | |
1622 | some zero length intervals. Eventually, do something clever | |
1623 | about inserting properly. For now, just waste the old intervals. */ | |
1624 | { | |
e5d967c9 | 1625 | BUF_INTERVALS (buffer) = reproduce_tree (source, tree->parent); |
944d4e4b | 1626 | BUF_INTERVALS (buffer)->position = 1; |
7ea69158 | 1627 | /* Explicitly free the old tree here. */ |
a50699fd | 1628 | |
7ea69158 RS |
1629 | return; |
1630 | } | |
1631 | /* Paranoia -- the text has already been added, so this buffer | |
1632 | should be of non-zero length. */ | |
1633 | else if (TOTAL_LENGTH (tree) == 0) | |
1634 | abort (); | |
a50699fd JA |
1635 | |
1636 | this = under = find_interval (tree, position); | |
1637 | if (NULL_INTERVAL_P (under)) /* Paranoia */ | |
1638 | abort (); | |
944d4e4b | 1639 | over = find_interval (source, interval_start_pos (source)); |
a50699fd | 1640 | |
323a7ad4 RS |
1641 | /* Here for insertion in the middle of an interval. |
1642 | Split off an equivalent interval to the right, | |
1643 | then don't bother with it any more. */ | |
a50699fd | 1644 | |
323a7ad4 | 1645 | if (position > under->position) |
a50699fd JA |
1646 | { |
1647 | INTERVAL end_unchanged | |
2bc7a79b | 1648 | = split_interval_left (this, position - under->position); |
a50699fd | 1649 | copy_properties (under, end_unchanged); |
323a7ad4 RS |
1650 | under->position = position; |
1651 | prev = 0; | |
1652 | middle = 1; | |
a50699fd | 1653 | } |
323a7ad4 RS |
1654 | else |
1655 | { | |
1656 | prev = previous_interval (under); | |
7ce503fd | 1657 | if (prev && !END_NONSTICKY_P (prev)) |
323a7ad4 RS |
1658 | prev = 0; |
1659 | } | |
1660 | ||
1661 | /* Insertion is now at beginning of UNDER. */ | |
a50699fd | 1662 | |
323a7ad4 | 1663 | /* The inserted text "sticks" to the interval `under', |
7ce503fd RS |
1664 | which means it gets those properties. |
1665 | The properties of under are the result of | |
8e6208c5 | 1666 | adjust_intervals_for_insertion, so stickiness has |
7ce503fd RS |
1667 | already been taken care of. */ |
1668 | ||
a50699fd JA |
1669 | while (! NULL_INTERVAL_P (over)) |
1670 | { | |
767809fb | 1671 | if (LENGTH (over) < LENGTH (under)) |
7ce503fd RS |
1672 | { |
1673 | this = split_interval_left (under, LENGTH (over)); | |
1674 | copy_properties (under, this); | |
1675 | } | |
323a7ad4 RS |
1676 | else |
1677 | this = under; | |
a50699fd | 1678 | copy_properties (over, this); |
7ea69158 | 1679 | if (inherit) |
7ce503fd RS |
1680 | merge_properties (over, this); |
1681 | else | |
1682 | copy_properties (over, this); | |
a50699fd JA |
1683 | over = next_interval (over); |
1684 | } | |
1685 | ||
e5d967c9 RS |
1686 | if (! NULL_INTERVAL_P (BUF_INTERVALS (buffer))) |
1687 | BUF_INTERVALS (buffer) = balance_an_interval (BUF_INTERVALS (buffer)); | |
a50699fd JA |
1688 | return; |
1689 | } | |
1690 | ||
5cae0ec6 RS |
1691 | /* Get the value of property PROP from PLIST, |
1692 | which is the plist of an interval. | |
70743ff1 | 1693 | We check for direct properties, for categories with property PROP, |
06d92327 | 1694 | and for PROP appearing on the default-text-properties list. */ |
5cae0ec6 RS |
1695 | |
1696 | Lisp_Object | |
323a7ad4 RS |
1697 | textget (plist, prop) |
1698 | Lisp_Object plist; | |
1699 | register Lisp_Object prop; | |
1700 | { | |
5cae0ec6 RS |
1701 | register Lisp_Object tail, fallback; |
1702 | fallback = Qnil; | |
323a7ad4 RS |
1703 | |
1704 | for (tail = plist; !NILP (tail); tail = Fcdr (Fcdr (tail))) | |
1705 | { | |
1706 | register Lisp_Object tem; | |
1707 | tem = Fcar (tail); | |
1708 | if (EQ (prop, tem)) | |
1709 | return Fcar (Fcdr (tail)); | |
5cae0ec6 | 1710 | if (EQ (tem, Qcategory)) |
5dd6606e RS |
1711 | { |
1712 | tem = Fcar (Fcdr (tail)); | |
1713 | if (SYMBOLP (tem)) | |
1714 | fallback = Fget (tem, prop); | |
1715 | } | |
323a7ad4 | 1716 | } |
5cae0ec6 | 1717 | |
70743ff1 BG |
1718 | if (! NILP (fallback)) |
1719 | return fallback; | |
06d92327 BG |
1720 | if (CONSP (Vdefault_text_properties)) |
1721 | return Fplist_get (Vdefault_text_properties, prop); | |
70743ff1 | 1722 | return Qnil; |
323a7ad4 | 1723 | } |
7ce503fd | 1724 | |
294efdbe | 1725 | \f |
ef1900f3 RS |
1726 | /* Set point "temporarily", without checking any text properties. */ |
1727 | ||
1728 | INLINE void | |
1729 | temp_set_point (buffer, charpos) | |
1730 | struct buffer *buffer; | |
1731 | int charpos; | |
1732 | { | |
1733 | temp_set_point_both (buffer, charpos, | |
1734 | buf_charpos_to_bytepos (buffer, charpos)); | |
1735 | } | |
1736 | ||
1737 | /* Set point in BUFFER "temporarily" to CHARPOS, which corresponds to | |
1738 | byte position BYTEPOS. */ | |
1739 | ||
1740 | INLINE void | |
1741 | temp_set_point_both (buffer, charpos, bytepos) | |
2189766e | 1742 | int charpos, bytepos; |
ef1900f3 RS |
1743 | struct buffer *buffer; |
1744 | { | |
1745 | /* In a single-byte buffer, the two positions must be equal. */ | |
1746 | if (BUF_ZV (buffer) == BUF_ZV_BYTE (buffer) | |
1747 | && charpos != bytepos) | |
1748 | abort (); | |
1749 | ||
1750 | if (charpos > bytepos) | |
1751 | abort (); | |
1752 | ||
1753 | if (charpos > BUF_ZV (buffer) || charpos < BUF_BEGV (buffer)) | |
1754 | abort (); | |
1755 | ||
1756 | BUF_PT_BYTE (buffer) = bytepos; | |
1757 | BUF_PT (buffer) = charpos; | |
1758 | } | |
1759 | ||
1760 | /* Set point in BUFFER to CHARPOS. If the target position is | |
f65013b0 | 1761 | before an intangible character, move to an ok place. */ |
a50699fd JA |
1762 | |
1763 | void | |
ef1900f3 | 1764 | set_point (buffer, charpos) |
a50699fd | 1765 | register struct buffer *buffer; |
ef1900f3 RS |
1766 | register int charpos; |
1767 | { | |
1768 | set_point_both (buffer, charpos, buf_charpos_to_bytepos (buffer, charpos)); | |
1769 | } | |
1770 | ||
1771 | /* Set point in BUFFER to CHARPOS, which corresponds to byte | |
1772 | position BYTEPOS. If the target position is | |
1773 | before an intangible character, move to an ok place. */ | |
1774 | ||
1775 | void | |
1776 | set_point_both (buffer, charpos, bytepos) | |
1777 | register struct buffer *buffer; | |
2189766e | 1778 | register int charpos, bytepos; |
a50699fd | 1779 | { |
e39adcda | 1780 | register INTERVAL to, from, toprev, fromprev; |
a50699fd | 1781 | int buffer_point; |
e5d967c9 | 1782 | int old_position = BUF_PT (buffer); |
ef1900f3 | 1783 | int backwards = (charpos < old_position ? 1 : 0); |
580fae94 RS |
1784 | int have_overlays; |
1785 | int original_position; | |
a50699fd | 1786 | |
b6a0ebc3 RS |
1787 | buffer->point_before_scroll = Qnil; |
1788 | ||
ef1900f3 | 1789 | if (charpos == BUF_PT (buffer)) |
a50699fd JA |
1790 | return; |
1791 | ||
ef1900f3 RS |
1792 | /* In a single-byte buffer, the two positions must be equal. */ |
1793 | if (BUF_ZV (buffer) == BUF_ZV_BYTE (buffer) | |
1794 | && charpos != bytepos) | |
1795 | abort (); | |
1796 | ||
62056764 JB |
1797 | /* Check this now, before checking if the buffer has any intervals. |
1798 | That way, we can catch conditions which break this sanity check | |
1799 | whether or not there are intervals in the buffer. */ | |
ef1900f3 | 1800 | if (charpos > BUF_ZV (buffer) || charpos < BUF_BEGV (buffer)) |
62056764 JB |
1801 | abort (); |
1802 | ||
580fae94 RS |
1803 | have_overlays = (! NILP (buffer->overlays_before) |
1804 | || ! NILP (buffer->overlays_after)); | |
1805 | ||
1806 | /* If we have no text properties and overlays, | |
1807 | then we can do it quickly. */ | |
1808 | if (NULL_INTERVAL_P (BUF_INTERVALS (buffer)) && ! have_overlays) | |
a50699fd | 1809 | { |
ef1900f3 | 1810 | temp_set_point_both (buffer, charpos, bytepos); |
a50699fd JA |
1811 | return; |
1812 | } | |
1813 | ||
ef1900f3 RS |
1814 | /* Set TO to the interval containing the char after CHARPOS, |
1815 | and TOPREV to the interval containing the char before CHARPOS. | |
323a7ad4 | 1816 | Either one may be null. They may be equal. */ |
ef1900f3 RS |
1817 | to = find_interval (BUF_INTERVALS (buffer), charpos); |
1818 | if (charpos == BUF_BEGV (buffer)) | |
294efdbe | 1819 | toprev = 0; |
ef1900f3 | 1820 | else if (to && to->position == charpos) |
323a7ad4 | 1821 | toprev = previous_interval (to); |
323a7ad4 RS |
1822 | else |
1823 | toprev = to; | |
1824 | ||
294efdbe RS |
1825 | buffer_point = (BUF_PT (buffer) == BUF_ZV (buffer) |
1826 | ? BUF_ZV (buffer) - 1 | |
323a7ad4 | 1827 | : BUF_PT (buffer)); |
9c79dd1b | 1828 | |
323a7ad4 RS |
1829 | /* Set FROM to the interval containing the char after PT, |
1830 | and FROMPREV to the interval containing the char before PT. | |
1831 | Either one may be null. They may be equal. */ | |
7ce503fd | 1832 | /* We could cache this and save time. */ |
e5d967c9 | 1833 | from = find_interval (BUF_INTERVALS (buffer), buffer_point); |
7ce503fd | 1834 | if (buffer_point == BUF_BEGV (buffer)) |
294efdbe | 1835 | fromprev = 0; |
580fae94 | 1836 | else if (from && from->position == BUF_PT (buffer)) |
323a7ad4 RS |
1837 | fromprev = previous_interval (from); |
1838 | else if (buffer_point != BUF_PT (buffer)) | |
1839 | fromprev = from, from = 0; | |
1840 | else | |
1841 | fromprev = from; | |
a50699fd | 1842 | |
7ce503fd | 1843 | /* Moving within an interval. */ |
580fae94 RS |
1844 | if (to == from && toprev == fromprev && INTERVAL_VISIBLE_P (to) |
1845 | && ! have_overlays) | |
a50699fd | 1846 | { |
ef1900f3 | 1847 | temp_set_point_both (buffer, charpos, bytepos); |
a50699fd JA |
1848 | return; |
1849 | } | |
1850 | ||
ef1900f3 | 1851 | original_position = charpos; |
580fae94 | 1852 | |
5eabb4e7 RS |
1853 | /* If the new position is between two intangible characters |
1854 | with the same intangible property value, | |
1855 | move forward or backward until a change in that property. */ | |
580fae94 RS |
1856 | if (NILP (Vinhibit_point_motion_hooks) |
1857 | && ((! NULL_INTERVAL_P (to) && ! NULL_INTERVAL_P (toprev)) | |
b827a9e3 RS |
1858 | || have_overlays) |
1859 | /* Intangibility never stops us from positioning at the beginning | |
1860 | or end of the buffer, so don't bother checking in that case. */ | |
ef1900f3 | 1861 | && charpos != BEGV && charpos != ZV) |
a50699fd | 1862 | { |
580fae94 RS |
1863 | Lisp_Object intangible_propval; |
1864 | Lisp_Object pos; | |
1865 | ||
ef1900f3 | 1866 | XSETINT (pos, charpos); |
580fae94 | 1867 | |
d5219de5 RS |
1868 | if (backwards) |
1869 | { | |
ef1900f3 | 1870 | intangible_propval = Fget_char_property (make_number (charpos), |
580fae94 | 1871 | Qintangible, Qnil); |
5eabb4e7 RS |
1872 | |
1873 | /* If following char is intangible, | |
1874 | skip back over all chars with matching intangible property. */ | |
1875 | if (! NILP (intangible_propval)) | |
580fae94 RS |
1876 | while (XINT (pos) > BUF_BEGV (buffer) |
1877 | && EQ (Fget_char_property (make_number (XINT (pos) - 1), | |
1878 | Qintangible, Qnil), | |
1879 | intangible_propval)) | |
1880 | pos = Fprevious_char_property_change (pos, Qnil); | |
d5219de5 | 1881 | } |
0df8950e | 1882 | else |
d5219de5 | 1883 | { |
ef1900f3 | 1884 | intangible_propval = Fget_char_property (make_number (charpos - 1), |
580fae94 | 1885 | Qintangible, Qnil); |
5eabb4e7 | 1886 | |
580fae94 | 1887 | /* If following char is intangible, |
887f2a2d | 1888 | skip forward over all chars with matching intangible property. */ |
5eabb4e7 | 1889 | if (! NILP (intangible_propval)) |
580fae94 RS |
1890 | while (XINT (pos) < BUF_ZV (buffer) |
1891 | && EQ (Fget_char_property (pos, Qintangible, Qnil), | |
1892 | intangible_propval)) | |
1893 | pos = Fnext_char_property_change (pos, Qnil); | |
1894 | ||
d5219de5 | 1895 | } |
580fae94 | 1896 | |
ef1900f3 RS |
1897 | charpos = XINT (pos); |
1898 | bytepos = buf_charpos_to_bytepos (buffer, charpos); | |
580fae94 RS |
1899 | } |
1900 | ||
ef1900f3 | 1901 | if (charpos != original_position) |
580fae94 | 1902 | { |
ef1900f3 RS |
1903 | /* Set TO to the interval containing the char after CHARPOS, |
1904 | and TOPREV to the interval containing the char before CHARPOS. | |
580fae94 | 1905 | Either one may be null. They may be equal. */ |
ef1900f3 RS |
1906 | to = find_interval (BUF_INTERVALS (buffer), charpos); |
1907 | if (charpos == BUF_BEGV (buffer)) | |
580fae94 | 1908 | toprev = 0; |
ef1900f3 | 1909 | else if (to && to->position == charpos) |
580fae94 RS |
1910 | toprev = previous_interval (to); |
1911 | else | |
1912 | toprev = to; | |
a50699fd | 1913 | } |
323a7ad4 | 1914 | |
5eabb4e7 RS |
1915 | /* Here TO is the interval after the stopping point |
1916 | and TOPREV is the interval before the stopping point. | |
1917 | One or the other may be null. */ | |
1918 | ||
ef1900f3 | 1919 | temp_set_point_both (buffer, charpos, bytepos); |
a50699fd | 1920 | |
d7e3e52b JA |
1921 | /* We run point-left and point-entered hooks here, iff the |
1922 | two intervals are not equivalent. These hooks take | |
323a7ad4 | 1923 | (old_point, new_point) as arguments. */ |
ddd931ff RS |
1924 | if (NILP (Vinhibit_point_motion_hooks) |
1925 | && (! intervals_equal (from, to) | |
1926 | || ! intervals_equal (fromprev, toprev))) | |
9c79dd1b | 1927 | { |
323a7ad4 RS |
1928 | Lisp_Object leave_after, leave_before, enter_after, enter_before; |
1929 | ||
1930 | if (fromprev) | |
1931 | leave_after = textget (fromprev->plist, Qpoint_left); | |
1932 | else | |
1933 | leave_after = Qnil; | |
1934 | if (from) | |
1935 | leave_before = textget (from->plist, Qpoint_left); | |
1936 | else | |
1937 | leave_before = Qnil; | |
1938 | ||
1939 | if (toprev) | |
1940 | enter_after = textget (toprev->plist, Qpoint_entered); | |
1941 | else | |
1942 | enter_after = Qnil; | |
1943 | if (to) | |
1944 | enter_before = textget (to->plist, Qpoint_entered); | |
1945 | else | |
1946 | enter_before = Qnil; | |
9c79dd1b | 1947 | |
323a7ad4 | 1948 | if (! EQ (leave_before, enter_before) && !NILP (leave_before)) |
4dcb3ee3 | 1949 | call2 (leave_before, make_number (old_position), |
ef1900f3 | 1950 | make_number (charpos)); |
323a7ad4 | 1951 | if (! EQ (leave_after, enter_after) && !NILP (leave_after)) |
4dcb3ee3 | 1952 | call2 (leave_after, make_number (old_position), |
ef1900f3 | 1953 | make_number (charpos)); |
9c79dd1b | 1954 | |
323a7ad4 | 1955 | if (! EQ (enter_before, leave_before) && !NILP (enter_before)) |
4dcb3ee3 | 1956 | call2 (enter_before, make_number (old_position), |
ef1900f3 | 1957 | make_number (charpos)); |
323a7ad4 | 1958 | if (! EQ (enter_after, leave_after) && !NILP (enter_after)) |
4dcb3ee3 | 1959 | call2 (enter_after, make_number (old_position), |
ef1900f3 | 1960 | make_number (charpos)); |
9c79dd1b | 1961 | } |
a50699fd | 1962 | } |
294efdbe | 1963 | \f |
a7fa233f RS |
1964 | /* Move point to POSITION, unless POSITION is inside an intangible |
1965 | segment that reaches all the way to point. */ | |
1966 | ||
1967 | void | |
1968 | move_if_not_intangible (position) | |
1969 | int position; | |
1970 | { | |
1971 | Lisp_Object pos; | |
1972 | Lisp_Object intangible_propval; | |
1973 | ||
1974 | XSETINT (pos, position); | |
1975 | ||
1976 | if (! NILP (Vinhibit_point_motion_hooks)) | |
1977 | /* If intangible is inhibited, always move point to POSITION. */ | |
1978 | ; | |
2e34157c | 1979 | else if (PT < position && XINT (pos) < ZV) |
a7fa233f RS |
1980 | { |
1981 | /* We want to move forward, so check the text before POSITION. */ | |
1982 | ||
1983 | intangible_propval = Fget_char_property (pos, | |
1984 | Qintangible, Qnil); | |
1985 | ||
1986 | /* If following char is intangible, | |
1987 | skip back over all chars with matching intangible property. */ | |
1988 | if (! NILP (intangible_propval)) | |
1989 | while (XINT (pos) > BEGV | |
1990 | && EQ (Fget_char_property (make_number (XINT (pos) - 1), | |
1991 | Qintangible, Qnil), | |
1992 | intangible_propval)) | |
1993 | pos = Fprevious_char_property_change (pos, Qnil); | |
1994 | } | |
2e34157c | 1995 | else if (XINT (pos) > BEGV) |
a7fa233f RS |
1996 | { |
1997 | /* We want to move backward, so check the text after POSITION. */ | |
1998 | ||
1999 | intangible_propval = Fget_char_property (make_number (XINT (pos) - 1), | |
2000 | Qintangible, Qnil); | |
2001 | ||
2002 | /* If following char is intangible, | |
887f2a2d | 2003 | skip forward over all chars with matching intangible property. */ |
a7fa233f RS |
2004 | if (! NILP (intangible_propval)) |
2005 | while (XINT (pos) < ZV | |
2006 | && EQ (Fget_char_property (pos, Qintangible, Qnil), | |
2007 | intangible_propval)) | |
2008 | pos = Fnext_char_property_change (pos, Qnil); | |
2009 | ||
2010 | } | |
2011 | ||
2012 | /* If the whole stretch between PT and POSITION isn't intangible, | |
2013 | try moving to POSITION (which means we actually move farther | |
2014 | if POSITION is inside of intangible text). */ | |
2015 | ||
2016 | if (XINT (pos) != PT) | |
2017 | SET_PT (position); | |
2018 | } | |
2019 | \f | |
5cae0ec6 RS |
2020 | /* Return the proper local map for position POSITION in BUFFER. |
2021 | Use the map specified by the local-map property, if any. | |
2022 | Otherwise, use BUFFER's local map. */ | |
2023 | ||
2024 | Lisp_Object | |
2025 | get_local_map (position, buffer) | |
2026 | register int position; | |
2027 | register struct buffer *buffer; | |
2028 | { | |
0f7a5fda | 2029 | Lisp_Object prop, tem, lispy_position, lispy_buffer; |
ef1900f3 | 2030 | int old_begv, old_zv, old_begv_byte, old_zv_byte; |
5cae0ec6 | 2031 | |
7ce503fd | 2032 | /* Perhaps we should just change `position' to the limit. */ |
5cae0ec6 RS |
2033 | if (position > BUF_Z (buffer) || position < BUF_BEG (buffer)) |
2034 | abort (); | |
2035 | ||
0f7a5fda KH |
2036 | /* Ignore narrowing, so that a local map continues to be valid even if |
2037 | the visible region contains no characters and hence no properties. */ | |
2038 | old_begv = BUF_BEGV (buffer); | |
2039 | old_zv = BUF_ZV (buffer); | |
ef1900f3 RS |
2040 | old_begv_byte = BUF_BEGV_BYTE (buffer); |
2041 | old_zv_byte = BUF_ZV_BYTE (buffer); | |
0f7a5fda KH |
2042 | BUF_BEGV (buffer) = BUF_BEG (buffer); |
2043 | BUF_ZV (buffer) = BUF_Z (buffer); | |
ef1900f3 RS |
2044 | BUF_BEGV_BYTE (buffer) = BUF_BEG_BYTE (buffer); |
2045 | BUF_ZV_BYTE (buffer) = BUF_Z_BYTE (buffer); | |
0f7a5fda KH |
2046 | |
2047 | /* There are no properties at the end of the buffer, so in that case | |
2048 | check for a local map on the last character of the buffer instead. */ | |
2049 | if (position == BUF_Z (buffer) && BUF_Z (buffer) > BUF_BEG (buffer)) | |
2050 | --position; | |
2051 | XSETFASTINT (lispy_position, position); | |
2052 | XSETBUFFER (lispy_buffer, buffer); | |
2053 | prop = Fget_char_property (lispy_position, Qlocal_map, lispy_buffer); | |
2054 | ||
2055 | BUF_BEGV (buffer) = old_begv; | |
2056 | BUF_ZV (buffer) = old_zv; | |
ef1900f3 RS |
2057 | BUF_BEGV_BYTE (buffer) = old_begv_byte; |
2058 | BUF_ZV_BYTE (buffer) = old_zv_byte; | |
5cae0ec6 RS |
2059 | |
2060 | /* Use the local map only if it is valid. */ | |
4a9f44cd RS |
2061 | /* Do allow symbols that are defined as keymaps. */ |
2062 | if (SYMBOLP (prop) && !NILP (prop)) | |
b988a842 | 2063 | prop = indirect_function (prop); |
0f7a5fda KH |
2064 | if (!NILP (prop) |
2065 | && (tem = Fkeymapp (prop), !NILP (tem))) | |
5cae0ec6 RS |
2066 | return prop; |
2067 | ||
e5d967c9 | 2068 | return buffer->keymap; |
5cae0ec6 RS |
2069 | } |
2070 | \f | |
9c79dd1b | 2071 | /* Produce an interval tree reflecting the intervals in |
944d4e4b KH |
2072 | TREE from START to START + LENGTH. |
2073 | The new interval tree has no parent and has a starting-position of 0. */ | |
a50699fd | 2074 | |
7b1d5b85 | 2075 | INTERVAL |
a50699fd JA |
2076 | copy_intervals (tree, start, length) |
2077 | INTERVAL tree; | |
2078 | int start, length; | |
2079 | { | |
2080 | register INTERVAL i, new, t; | |
95e3e1ef | 2081 | register int got, prevlen; |
a50699fd JA |
2082 | |
2083 | if (NULL_INTERVAL_P (tree) || length <= 0) | |
2084 | return NULL_INTERVAL; | |
2085 | ||
2086 | i = find_interval (tree, start); | |
2087 | if (NULL_INTERVAL_P (i) || LENGTH (i) == 0) | |
2088 | abort (); | |
2089 | ||
7ce503fd | 2090 | /* If there is only one interval and it's the default, return nil. */ |
a50699fd JA |
2091 | if ((start - i->position + 1 + length) < LENGTH (i) |
2092 | && DEFAULT_INTERVAL_P (i)) | |
2093 | return NULL_INTERVAL; | |
2094 | ||
2095 | new = make_interval (); | |
944d4e4b | 2096 | new->position = 0; |
a50699fd | 2097 | got = (LENGTH (i) - (start - i->position)); |
9c79dd1b | 2098 | new->total_length = length; |
a50699fd JA |
2099 | copy_properties (i, new); |
2100 | ||
2101 | t = new; | |
95e3e1ef | 2102 | prevlen = got; |
a50699fd JA |
2103 | while (got < length) |
2104 | { | |
2105 | i = next_interval (i); | |
2bc7a79b | 2106 | t = split_interval_right (t, prevlen); |
a50699fd | 2107 | copy_properties (i, t); |
95e3e1ef RS |
2108 | prevlen = LENGTH (i); |
2109 | got += prevlen; | |
a50699fd JA |
2110 | } |
2111 | ||
4314dea4 | 2112 | return balance_an_interval (new); |
a50699fd JA |
2113 | } |
2114 | ||
7ce503fd | 2115 | /* Give STRING the properties of BUFFER from POSITION to LENGTH. */ |
a50699fd | 2116 | |
d7e3e52b | 2117 | INLINE void |
a50699fd | 2118 | copy_intervals_to_string (string, buffer, position, length) |
46d8a55b RS |
2119 | Lisp_Object string; |
2120 | struct buffer *buffer; | |
a50699fd JA |
2121 | int position, length; |
2122 | { | |
46d8a55b | 2123 | INTERVAL interval_copy = copy_intervals (BUF_INTERVALS (buffer), |
a50699fd JA |
2124 | position, length); |
2125 | if (NULL_INTERVAL_P (interval_copy)) | |
2126 | return; | |
2127 | ||
2e34157c | 2128 | interval_copy->parent = (INTERVAL) XFASTINT (string); |
a50699fd JA |
2129 | XSTRING (string)->intervals = interval_copy; |
2130 | } | |
d8638d30 | 2131 | \f |
944d4e4b | 2132 | /* Return 1 if strings S1 and S2 have identical properties; 0 otherwise. |
d8638d30 RS |
2133 | Assume they have identical characters. */ |
2134 | ||
2135 | int | |
2136 | compare_string_intervals (s1, s2) | |
2137 | Lisp_Object s1, s2; | |
2138 | { | |
2139 | INTERVAL i1, i2; | |
944d4e4b KH |
2140 | int pos = 0; |
2141 | int end = XSTRING (s1)->size; | |
d8638d30 | 2142 | |
944d4e4b KH |
2143 | i1 = find_interval (XSTRING (s1)->intervals, 0); |
2144 | i2 = find_interval (XSTRING (s2)->intervals, 0); | |
d8638d30 RS |
2145 | |
2146 | while (pos < end) | |
2147 | { | |
2148 | /* Determine how far we can go before we reach the end of I1 or I2. */ | |
2149 | int len1 = (i1 != 0 ? INTERVAL_LAST_POS (i1) : end) - pos; | |
2150 | int len2 = (i2 != 0 ? INTERVAL_LAST_POS (i2) : end) - pos; | |
2151 | int distance = min (len1, len2); | |
2152 | ||
2153 | /* If we ever find a mismatch between the strings, | |
2154 | they differ. */ | |
2155 | if (! intervals_equal (i1, i2)) | |
2156 | return 0; | |
2157 | ||
2158 | /* Advance POS till the end of the shorter interval, | |
2159 | and advance one or both interval pointers for the new position. */ | |
2160 | pos += distance; | |
2161 | if (len1 == distance) | |
2162 | i1 = next_interval (i1); | |
2163 | if (len2 == distance) | |
2164 | i2 = next_interval (i2); | |
2165 | } | |
2166 | return 1; | |
2167 | } | |
37f26f3c | 2168 | \f |
37f26f3c RS |
2169 | /* Recursively adjust interval I in the current buffer |
2170 | for setting enable_multibyte_characters to MULTI_FLAG. | |
2171 | The range of interval I is START ... END in characters, | |
2172 | START_BYTE ... END_BYTE in bytes. */ | |
2173 | ||
2174 | static void | |
2175 | set_intervals_multibyte_1 (i, multi_flag, start, start_byte, end, end_byte) | |
2176 | INTERVAL i; | |
2177 | int multi_flag; | |
2178 | int start, start_byte, end, end_byte; | |
2179 | { | |
37f26f3c RS |
2180 | /* Fix the length of this interval. */ |
2181 | if (multi_flag) | |
2182 | i->total_length = end - start; | |
2183 | else | |
2184 | i->total_length = end_byte - start_byte; | |
2185 | ||
2186 | /* Recursively fix the length of the subintervals. */ | |
2187 | if (i->left) | |
2188 | { | |
2189 | int left_end, left_end_byte; | |
2190 | ||
2191 | if (multi_flag) | |
2192 | { | |
2193 | left_end_byte = start_byte + LEFT_TOTAL_LENGTH (i); | |
2194 | left_end = BYTE_TO_CHAR (left_end_byte); | |
2195 | } | |
2196 | else | |
2197 | { | |
2198 | left_end = start + LEFT_TOTAL_LENGTH (i); | |
2199 | left_end_byte = CHAR_TO_BYTE (left_end); | |
2200 | } | |
2201 | ||
2202 | set_intervals_multibyte_1 (i->left, multi_flag, start, start_byte, | |
2203 | left_end, left_end_byte); | |
2204 | } | |
2205 | if (i->right) | |
2206 | { | |
2207 | int right_start_byte, right_start; | |
2208 | ||
2209 | if (multi_flag) | |
2210 | { | |
2211 | right_start_byte = end_byte - RIGHT_TOTAL_LENGTH (i); | |
2212 | right_start = BYTE_TO_CHAR (right_start_byte); | |
2213 | } | |
2214 | else | |
2215 | { | |
2216 | right_start = end - RIGHT_TOTAL_LENGTH (i); | |
2217 | right_start_byte = CHAR_TO_BYTE (right_start); | |
2218 | } | |
2219 | ||
2220 | set_intervals_multibyte_1 (i->right, multi_flag, | |
2221 | right_start, right_start_byte, | |
2222 | end, end_byte); | |
2223 | } | |
2224 | } | |
d2f7a802 | 2225 | |
24cef261 RS |
2226 | /* Update the intervals of the current buffer |
2227 | to fit the contents as multibyte (if MULTI_FLAG is 1) | |
2228 | or to fit them as non-multibyte (if MULTI_FLAG is 0). */ | |
2229 | ||
2230 | void | |
2231 | set_intervals_multibyte (multi_flag) | |
2232 | int multi_flag; | |
2233 | { | |
2234 | if (BUF_INTERVALS (current_buffer)) | |
2235 | set_intervals_multibyte_1 (BUF_INTERVALS (current_buffer), multi_flag, | |
2236 | BEG, BEG_BYTE, Z, Z_BYTE); | |
2237 | } |