Commit | Line | Data |
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a50699fd | 1 | /* Code for doing intervals. |
acaf905b | 2 | Copyright (C) 1993-1995, 1997-1998, 2001-2012 Free Software Foundation, Inc. |
a50699fd JA |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
a50699fd | 7 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) any later version. | |
a50699fd JA |
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 | |
9ec0b715 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
a50699fd JA |
18 | |
19 | ||
20 | /* NOTES: | |
21 | ||
22 | Have to ensure that we can't put symbol nil on a plist, or some | |
23 | functions may work incorrectly. | |
24 | ||
25 | An idea: Have the owner of the tree keep count of splits and/or | |
26 | insertion lengths (in intervals), and balance after every N. | |
27 | ||
28 | Need to call *_left_hook when buffer is killed. | |
29 | ||
30 | Scan for zero-length, or 0-length to see notes about handling | |
31 | zero length interval-markers. | |
32 | ||
33 | There are comments around about freeing intervals. It might be | |
34 | faster to explicitly free them (put them on the free list) than | |
35 | to GC them. | |
36 | ||
37 | */ | |
38 | ||
39 | ||
18160b98 | 40 | #include <config.h> |
d7306fe6 | 41 | #include <setjmp.h> |
37aa2f85 | 42 | #include <intprops.h> |
a50699fd JA |
43 | #include "lisp.h" |
44 | #include "intervals.h" | |
e5560ff7 | 45 | #include "character.h" |
a50699fd | 46 | #include "buffer.h" |
328c0f1f | 47 | #include "puresize.h" |
f54a8c1a | 48 | #include "keyboard.h" |
8feddab4 | 49 | #include "keymap.h" |
a50699fd | 50 | |
45d82bdc KH |
51 | /* Test for membership, allowing for t (actually any non-cons) to mean the |
52 | universal set. */ | |
53 | ||
54 | #define TMEM(sym, set) (CONSP (set) ? ! NILP (Fmemq (sym, set)) : ! NILP (set)) | |
55 | ||
93ea6e8f PE |
56 | static Lisp_Object merge_properties_sticky (Lisp_Object, Lisp_Object); |
57 | static INTERVAL merge_interval_right (INTERVAL); | |
f57e2426 J |
58 | static INTERVAL reproduce_tree (INTERVAL, INTERVAL); |
59 | static INTERVAL reproduce_tree_obj (INTERVAL, Lisp_Object); | |
a50699fd | 60 | \f |
7ce503fd | 61 | /* Utility functions for intervals. */ |
a50699fd JA |
62 | |
63 | ||
7ce503fd | 64 | /* Create the root interval of some object, a buffer or string. */ |
a50699fd JA |
65 | |
66 | INTERVAL | |
971de7fb | 67 | create_root_interval (Lisp_Object parent) |
a50699fd | 68 | { |
328c0f1f RS |
69 | INTERVAL new; |
70 | ||
71 | CHECK_IMPURE (parent); | |
72 | ||
73 | new = make_interval (); | |
a50699fd | 74 | |
b629dd47 | 75 | if (BUFFERP (parent)) |
a50699fd | 76 | { |
2bc7a79b JB |
77 | new->total_length = (BUF_Z (XBUFFER (parent)) |
78 | - BUF_BEG (XBUFFER (parent))); | |
727fec2d | 79 | CHECK_TOTAL_LENGTH (new); |
e5d967c9 | 80 | BUF_INTERVALS (XBUFFER (parent)) = new; |
4867a283 | 81 | new->position = BEG; |
a50699fd | 82 | } |
b629dd47 | 83 | else if (STRINGP (parent)) |
a50699fd | 84 | { |
d5db4077 | 85 | new->total_length = SCHARS (parent); |
727fec2d | 86 | CHECK_TOTAL_LENGTH (new); |
b13738b6 | 87 | STRING_SET_INTERVALS (parent, new); |
944d4e4b | 88 | new->position = 0; |
a50699fd JA |
89 | } |
90 | ||
439d5cb4 | 91 | SET_INTERVAL_OBJECT (new, parent); |
a50699fd JA |
92 | |
93 | return new; | |
94 | } | |
95 | ||
96 | /* Make the interval TARGET have exactly the properties of SOURCE */ | |
97 | ||
98 | void | |
971de7fb | 99 | copy_properties (register INTERVAL source, register INTERVAL target) |
a50699fd JA |
100 | { |
101 | if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target)) | |
102 | return; | |
103 | ||
104 | COPY_INTERVAL_CACHE (source, target); | |
105 | target->plist = Fcopy_sequence (source->plist); | |
106 | } | |
107 | ||
108 | /* Merge the properties of interval SOURCE into the properties | |
323a7ad4 RS |
109 | of interval TARGET. That is to say, each property in SOURCE |
110 | is added to TARGET if TARGET has no such property as yet. */ | |
a50699fd JA |
111 | |
112 | static void | |
971de7fb | 113 | merge_properties (register INTERVAL source, register INTERVAL target) |
a50699fd JA |
114 | { |
115 | register Lisp_Object o, sym, val; | |
116 | ||
117 | if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target)) | |
118 | return; | |
119 | ||
120 | MERGE_INTERVAL_CACHE (source, target); | |
121 | ||
122 | o = source->plist; | |
4867a283 | 123 | while (CONSP (o)) |
a50699fd | 124 | { |
4867a283 | 125 | sym = XCAR (o); |
4028a938 KS |
126 | o = XCDR (o); |
127 | CHECK_CONS (o); | |
128 | ||
129 | val = target->plist; | |
130 | while (CONSP (val) && !EQ (XCAR (val), sym)) | |
131 | { | |
132 | val = XCDR (val); | |
133 | if (!CONSP (val)) | |
134 | break; | |
135 | val = XCDR (val); | |
136 | } | |
a50699fd JA |
137 | |
138 | if (NILP (val)) | |
139 | { | |
4867a283 | 140 | val = XCAR (o); |
a50699fd | 141 | target->plist = Fcons (sym, Fcons (val, target->plist)); |
a50699fd | 142 | } |
4028a938 | 143 | o = XCDR (o); |
a50699fd JA |
144 | } |
145 | } | |
146 | ||
147 | /* Return 1 if the two intervals have the same properties, | |
7ce503fd | 148 | 0 otherwise. */ |
a50699fd JA |
149 | |
150 | int | |
971de7fb | 151 | intervals_equal (INTERVAL i0, INTERVAL i1) |
a50699fd | 152 | { |
4028a938 KS |
153 | register Lisp_Object i0_cdr, i0_sym; |
154 | register Lisp_Object i1_cdr, i1_val; | |
a50699fd JA |
155 | |
156 | if (DEFAULT_INTERVAL_P (i0) && DEFAULT_INTERVAL_P (i1)) | |
157 | return 1; | |
158 | ||
323a7ad4 RS |
159 | if (DEFAULT_INTERVAL_P (i0) || DEFAULT_INTERVAL_P (i1)) |
160 | return 0; | |
161 | ||
a50699fd | 162 | i0_cdr = i0->plist; |
4028a938 KS |
163 | i1_cdr = i1->plist; |
164 | while (CONSP (i0_cdr) && CONSP (i1_cdr)) | |
a50699fd | 165 | { |
4867a283 | 166 | i0_sym = XCAR (i0_cdr); |
4028a938 KS |
167 | i0_cdr = XCDR (i0_cdr); |
168 | if (!CONSP (i0_cdr)) | |
169 | return 0; /* abort (); */ | |
170 | i1_val = i1->plist; | |
171 | while (CONSP (i1_val) && !EQ (XCAR (i1_val), i0_sym)) | |
172 | { | |
173 | i1_val = XCDR (i1_val); | |
174 | if (!CONSP (i1_val)) | |
175 | return 0; /* abort (); */ | |
176 | i1_val = XCDR (i1_val); | |
177 | } | |
a50699fd | 178 | |
7ce503fd | 179 | /* i0 has something i1 doesn't. */ |
a50699fd JA |
180 | if (EQ (i1_val, Qnil)) |
181 | return 0; | |
182 | ||
7ce503fd | 183 | /* i0 and i1 both have sym, but it has different values in each. */ |
4028a938 KS |
184 | if (!CONSP (i1_val) |
185 | || (i1_val = XCDR (i1_val), !CONSP (i1_val)) | |
186 | || !EQ (XCAR (i1_val), XCAR (i0_cdr))) | |
a50699fd JA |
187 | return 0; |
188 | ||
4867a283 | 189 | i0_cdr = XCDR (i0_cdr); |
a50699fd | 190 | |
4028a938 KS |
191 | i1_cdr = XCDR (i1_cdr); |
192 | if (!CONSP (i1_cdr)) | |
193 | return 0; /* abort (); */ | |
194 | i1_cdr = XCDR (i1_cdr); | |
195 | } | |
a50699fd | 196 | |
4028a938 KS |
197 | /* Lengths of the two plists were equal. */ |
198 | return (NILP (i0_cdr) && NILP (i1_cdr)); | |
a50699fd JA |
199 | } |
200 | \f | |
a50699fd | 201 | |
19d4e9a7 SM |
202 | /* Traverse an interval tree TREE, performing FUNCTION on each node. |
203 | No guarantee is made about the order of traversal. | |
204 | Pass FUNCTION two args: an interval, and ARG. */ | |
205 | ||
206 | void | |
971de7fb | 207 | traverse_intervals_noorder (INTERVAL tree, void (*function) (INTERVAL, Lisp_Object), Lisp_Object arg) |
19d4e9a7 SM |
208 | { |
209 | /* Minimize stack usage. */ | |
210 | while (!NULL_INTERVAL_P (tree)) | |
211 | { | |
212 | (*function) (tree, arg); | |
213 | if (NULL_INTERVAL_P (tree->right)) | |
214 | tree = tree->left; | |
215 | else | |
216 | { | |
217 | traverse_intervals_noorder (tree->left, function, arg); | |
218 | tree = tree->right; | |
219 | } | |
220 | } | |
221 | } | |
222 | ||
a50699fd | 223 | /* Traverse an interval tree TREE, performing FUNCTION on each node. |
4a93c905 | 224 | Pass FUNCTION two args: an interval, and ARG. */ |
a50699fd JA |
225 | |
226 | void | |
d311d28c | 227 | traverse_intervals (INTERVAL tree, ptrdiff_t position, |
e79123aa | 228 | void (*function) (INTERVAL, Lisp_Object), Lisp_Object arg) |
a50699fd | 229 | { |
19d4e9a7 SM |
230 | while (!NULL_INTERVAL_P (tree)) |
231 | { | |
42005513 | 232 | traverse_intervals (tree->left, position, function, arg); |
19d4e9a7 SM |
233 | position += LEFT_TOTAL_LENGTH (tree); |
234 | tree->position = position; | |
235 | (*function) (tree, arg); | |
42005513 | 236 | position += LENGTH (tree); tree = tree->right; |
19d4e9a7 | 237 | } |
a50699fd JA |
238 | } |
239 | \f | |
240 | #if 0 | |
e39adcda GM |
241 | |
242 | static int icount; | |
243 | static int idepth; | |
244 | static int zero_length; | |
245 | ||
7ce503fd | 246 | /* These functions are temporary, for debugging purposes only. */ |
a50699fd JA |
247 | |
248 | INTERVAL search_interval, found_interval; | |
249 | ||
250 | void | |
1dae0f0a | 251 | check_for_interval (INTERVAL i) |
a50699fd JA |
252 | { |
253 | if (i == search_interval) | |
254 | { | |
255 | found_interval = i; | |
256 | icount++; | |
257 | } | |
258 | } | |
259 | ||
260 | INTERVAL | |
1dae0f0a | 261 | search_for_interval (INTERVAL i, INTERVAL tree) |
a50699fd JA |
262 | { |
263 | icount = 0; | |
264 | search_interval = i; | |
265 | found_interval = NULL_INTERVAL; | |
19d4e9a7 | 266 | traverse_intervals_noorder (tree, &check_for_interval, Qnil); |
a50699fd JA |
267 | return found_interval; |
268 | } | |
269 | ||
270 | static void | |
1dae0f0a | 271 | inc_interval_count (INTERVAL i) |
a50699fd JA |
272 | { |
273 | icount++; | |
274 | if (LENGTH (i) == 0) | |
275 | zero_length++; | |
276 | if (depth > idepth) | |
277 | idepth = depth; | |
278 | } | |
279 | ||
280 | int | |
1dae0f0a | 281 | count_intervals (INTERVAL i) |
a50699fd JA |
282 | { |
283 | icount = 0; | |
284 | idepth = 0; | |
285 | zero_length = 0; | |
19d4e9a7 | 286 | traverse_intervals_noorder (i, &inc_interval_count, Qnil); |
a50699fd JA |
287 | |
288 | return icount; | |
289 | } | |
290 | ||
291 | static INTERVAL | |
1dae0f0a | 292 | root_interval (INTERVAL interval) |
a50699fd JA |
293 | { |
294 | register INTERVAL i = interval; | |
295 | ||
296 | while (! ROOT_INTERVAL_P (i)) | |
439d5cb4 | 297 | i = INTERVAL_PARENT (i); |
a50699fd JA |
298 | |
299 | return i; | |
300 | } | |
301 | #endif | |
302 | \f | |
303 | /* Assuming that a left child exists, perform the following operation: | |
304 | ||
305 | A B | |
306 | / \ / \ | |
307 | B => A | |
308 | / \ / \ | |
309 | c c | |
310 | */ | |
311 | ||
55d4c1b2 | 312 | static inline INTERVAL |
971de7fb | 313 | rotate_right (INTERVAL interval) |
a50699fd JA |
314 | { |
315 | INTERVAL i; | |
316 | INTERVAL B = interval->left; | |
d311d28c | 317 | ptrdiff_t old_total = interval->total_length; |
a50699fd | 318 | |
7ce503fd | 319 | /* Deal with any Parent of A; make it point to B. */ |
a50699fd | 320 | if (! ROOT_INTERVAL_P (interval)) |
e39adcda GM |
321 | { |
322 | if (AM_LEFT_CHILD (interval)) | |
439d5cb4 | 323 | INTERVAL_PARENT (interval)->left = B; |
e39adcda | 324 | else |
439d5cb4 | 325 | INTERVAL_PARENT (interval)->right = B; |
e39adcda | 326 | } |
439d5cb4 | 327 | COPY_INTERVAL_PARENT (B, interval); |
a50699fd | 328 | |
4314dea4 RS |
329 | /* Make B the parent of A */ |
330 | i = B->right; | |
331 | B->right = interval; | |
439d5cb4 | 332 | SET_INTERVAL_PARENT (interval, B); |
a50699fd | 333 | |
4314dea4 | 334 | /* Make A point to c */ |
a50699fd JA |
335 | interval->left = i; |
336 | if (! NULL_INTERVAL_P (i)) | |
439d5cb4 | 337 | SET_INTERVAL_PARENT (i, interval); |
4314dea4 | 338 | |
550bd63a | 339 | /* A's total length is decreased by the length of B and its left child. */ |
4314dea4 | 340 | interval->total_length -= B->total_length - LEFT_TOTAL_LENGTH (interval); |
727fec2d | 341 | CHECK_TOTAL_LENGTH (interval); |
4314dea4 RS |
342 | |
343 | /* B must have the same total length of A. */ | |
344 | B->total_length = old_total; | |
727fec2d | 345 | CHECK_TOTAL_LENGTH (B); |
a50699fd JA |
346 | |
347 | return B; | |
348 | } | |
4314dea4 | 349 | |
a50699fd JA |
350 | /* Assuming that a right child exists, perform the following operation: |
351 | ||
7d0393cf JB |
352 | A B |
353 | / \ / \ | |
a50699fd | 354 | B => A |
7d0393cf | 355 | / \ / \ |
a50699fd JA |
356 | c c |
357 | */ | |
358 | ||
55d4c1b2 | 359 | static inline INTERVAL |
971de7fb | 360 | rotate_left (INTERVAL interval) |
a50699fd JA |
361 | { |
362 | INTERVAL i; | |
363 | INTERVAL B = interval->right; | |
d311d28c | 364 | ptrdiff_t old_total = interval->total_length; |
a50699fd | 365 | |
4314dea4 | 366 | /* Deal with any parent of A; make it point to B. */ |
a50699fd | 367 | if (! ROOT_INTERVAL_P (interval)) |
e39adcda GM |
368 | { |
369 | if (AM_LEFT_CHILD (interval)) | |
439d5cb4 | 370 | INTERVAL_PARENT (interval)->left = B; |
e39adcda | 371 | else |
439d5cb4 | 372 | INTERVAL_PARENT (interval)->right = B; |
e39adcda | 373 | } |
439d5cb4 | 374 | COPY_INTERVAL_PARENT (B, interval); |
a50699fd JA |
375 | |
376 | /* Make B the parent of A */ | |
4314dea4 RS |
377 | i = B->left; |
378 | B->left = interval; | |
439d5cb4 | 379 | SET_INTERVAL_PARENT (interval, B); |
a50699fd JA |
380 | |
381 | /* Make A point to c */ | |
382 | interval->right = i; | |
383 | if (! NULL_INTERVAL_P (i)) | |
439d5cb4 | 384 | SET_INTERVAL_PARENT (i, interval); |
4314dea4 | 385 | |
550bd63a | 386 | /* A's total length is decreased by the length of B and its right child. */ |
4314dea4 | 387 | interval->total_length -= B->total_length - RIGHT_TOTAL_LENGTH (interval); |
727fec2d | 388 | CHECK_TOTAL_LENGTH (interval); |
4314dea4 RS |
389 | |
390 | /* B must have the same total length of A. */ | |
391 | B->total_length = old_total; | |
727fec2d | 392 | CHECK_TOTAL_LENGTH (B); |
a50699fd JA |
393 | |
394 | return B; | |
395 | } | |
396 | \f | |
4314dea4 RS |
397 | /* Balance an interval tree with the assumption that the subtrees |
398 | themselves are already balanced. */ | |
399 | ||
400 | static INTERVAL | |
971de7fb | 401 | balance_an_interval (INTERVAL i) |
4314dea4 | 402 | { |
d311d28c | 403 | register ptrdiff_t old_diff, new_diff; |
4314dea4 RS |
404 | |
405 | while (1) | |
406 | { | |
407 | old_diff = LEFT_TOTAL_LENGTH (i) - RIGHT_TOTAL_LENGTH (i); | |
408 | if (old_diff > 0) | |
409 | { | |
727fec2d | 410 | /* Since the left child is longer, there must be one. */ |
4314dea4 RS |
411 | new_diff = i->total_length - i->left->total_length |
412 | + RIGHT_TOTAL_LENGTH (i->left) - LEFT_TOTAL_LENGTH (i->left); | |
1ea40aa2 | 413 | if (eabs (new_diff) >= old_diff) |
4314dea4 RS |
414 | break; |
415 | i = rotate_right (i); | |
416 | balance_an_interval (i->right); | |
417 | } | |
418 | else if (old_diff < 0) | |
419 | { | |
727fec2d | 420 | /* Since the right child is longer, there must be one. */ |
4314dea4 RS |
421 | new_diff = i->total_length - i->right->total_length |
422 | + LEFT_TOTAL_LENGTH (i->right) - RIGHT_TOTAL_LENGTH (i->right); | |
1ea40aa2 | 423 | if (eabs (new_diff) >= -old_diff) |
4314dea4 RS |
424 | break; |
425 | i = rotate_left (i); | |
426 | balance_an_interval (i->left); | |
427 | } | |
428 | else | |
429 | break; | |
430 | } | |
431 | return i; | |
432 | } | |
433 | ||
434 | /* Balance INTERVAL, potentially stuffing it back into its parent | |
435 | Lisp Object. */ | |
436 | ||
55d4c1b2 | 437 | static inline INTERVAL |
971de7fb | 438 | balance_possible_root_interval (register INTERVAL interval) |
4314dea4 RS |
439 | { |
440 | Lisp_Object parent; | |
439d5cb4 | 441 | int have_parent = 0; |
4314dea4 | 442 | |
439d5cb4 | 443 | if (!INTERVAL_HAS_OBJECT (interval) && !INTERVAL_HAS_PARENT (interval)) |
4314dea4 RS |
444 | return interval; |
445 | ||
439d5cb4 KR |
446 | if (INTERVAL_HAS_OBJECT (interval)) |
447 | { | |
448 | have_parent = 1; | |
449 | GET_INTERVAL_OBJECT (parent, interval); | |
450 | } | |
4314dea4 RS |
451 | interval = balance_an_interval (interval); |
452 | ||
439d5cb4 KR |
453 | if (have_parent) |
454 | { | |
455 | if (BUFFERP (parent)) | |
456 | BUF_INTERVALS (XBUFFER (parent)) = interval; | |
457 | else if (STRINGP (parent)) | |
b13738b6 | 458 | STRING_SET_INTERVALS (parent, interval); |
439d5cb4 | 459 | } |
4314dea4 RS |
460 | |
461 | return interval; | |
462 | } | |
463 | ||
464 | /* Balance the interval tree TREE. Balancing is by weight | |
465 | (the amount of text). */ | |
466 | ||
467 | static INTERVAL | |
971de7fb | 468 | balance_intervals_internal (register INTERVAL tree) |
4314dea4 RS |
469 | { |
470 | /* Balance within each side. */ | |
471 | if (tree->left) | |
8f3b9b95 | 472 | balance_intervals_internal (tree->left); |
4314dea4 | 473 | if (tree->right) |
8f3b9b95 | 474 | balance_intervals_internal (tree->right); |
4314dea4 RS |
475 | return balance_an_interval (tree); |
476 | } | |
477 | ||
478 | /* Advertised interface to balance intervals. */ | |
479 | ||
480 | INTERVAL | |
971de7fb | 481 | balance_intervals (INTERVAL tree) |
4314dea4 RS |
482 | { |
483 | if (tree == NULL_INTERVAL) | |
484 | return NULL_INTERVAL; | |
485 | ||
486 | return balance_intervals_internal (tree); | |
487 | } | |
488 | \f | |
2bc7a79b JB |
489 | /* Split INTERVAL into two pieces, starting the second piece at |
490 | character position OFFSET (counting from 0), relative to INTERVAL. | |
491 | INTERVAL becomes the left-hand piece, and the right-hand piece | |
492 | (second, lexicographically) is returned. | |
90ba40fc JA |
493 | |
494 | The size and position fields of the two intervals are set based upon | |
495 | those of the original interval. The property list of the new interval | |
496 | is reset, thus it is up to the caller to do the right thing with the | |
497 | result. | |
a50699fd JA |
498 | |
499 | Note that this does not change the position of INTERVAL; if it is a root, | |
7ce503fd | 500 | it is still a root after this operation. */ |
a50699fd JA |
501 | |
502 | INTERVAL | |
d311d28c | 503 | split_interval_right (INTERVAL interval, ptrdiff_t offset) |
a50699fd JA |
504 | { |
505 | INTERVAL new = make_interval (); | |
d311d28c PE |
506 | ptrdiff_t position = interval->position; |
507 | ptrdiff_t new_length = LENGTH (interval) - offset; | |
a50699fd | 508 | |
2bc7a79b | 509 | new->position = position + offset; |
439d5cb4 | 510 | SET_INTERVAL_PARENT (new, interval); |
a50699fd | 511 | |
4314dea4 | 512 | if (NULL_RIGHT_CHILD (interval)) |
a50699fd JA |
513 | { |
514 | interval->right = new; | |
515 | new->total_length = new_length; | |
727fec2d | 516 | CHECK_TOTAL_LENGTH (new); |
a50699fd | 517 | } |
cc6e2aaa RS |
518 | else |
519 | { | |
520 | /* Insert the new node between INTERVAL and its right child. */ | |
521 | new->right = interval->right; | |
439d5cb4 | 522 | SET_INTERVAL_PARENT (interval->right, new); |
cc6e2aaa RS |
523 | interval->right = new; |
524 | new->total_length = new_length + new->right->total_length; | |
727fec2d | 525 | CHECK_TOTAL_LENGTH (new); |
cc6e2aaa RS |
526 | balance_an_interval (new); |
527 | } | |
7d0393cf | 528 | |
4314dea4 RS |
529 | balance_possible_root_interval (interval); |
530 | ||
a50699fd JA |
531 | return new; |
532 | } | |
533 | ||
2bc7a79b JB |
534 | /* Split INTERVAL into two pieces, starting the second piece at |
535 | character position OFFSET (counting from 0), relative to INTERVAL. | |
536 | INTERVAL becomes the right-hand piece, and the left-hand piece | |
537 | (first, lexicographically) is returned. | |
a50699fd | 538 | |
90ba40fc JA |
539 | The size and position fields of the two intervals are set based upon |
540 | those of the original interval. The property list of the new interval | |
541 | is reset, thus it is up to the caller to do the right thing with the | |
542 | result. | |
543 | ||
544 | Note that this does not change the position of INTERVAL; if it is a root, | |
7ce503fd | 545 | it is still a root after this operation. */ |
a50699fd JA |
546 | |
547 | INTERVAL | |
d311d28c | 548 | split_interval_left (INTERVAL interval, ptrdiff_t offset) |
a50699fd JA |
549 | { |
550 | INTERVAL new = make_interval (); | |
d311d28c | 551 | ptrdiff_t new_length = offset; |
a50699fd | 552 | |
a50699fd | 553 | new->position = interval->position; |
2bc7a79b | 554 | interval->position = interval->position + offset; |
439d5cb4 | 555 | SET_INTERVAL_PARENT (new, interval); |
a50699fd JA |
556 | |
557 | if (NULL_LEFT_CHILD (interval)) | |
558 | { | |
559 | interval->left = new; | |
560 | new->total_length = new_length; | |
727fec2d | 561 | CHECK_TOTAL_LENGTH (new); |
a50699fd | 562 | } |
cc6e2aaa RS |
563 | else |
564 | { | |
565 | /* Insert the new node between INTERVAL and its left child. */ | |
566 | new->left = interval->left; | |
439d5cb4 | 567 | SET_INTERVAL_PARENT (new->left, new); |
cc6e2aaa RS |
568 | interval->left = new; |
569 | new->total_length = new_length + new->left->total_length; | |
727fec2d | 570 | CHECK_TOTAL_LENGTH (new); |
cc6e2aaa RS |
571 | balance_an_interval (new); |
572 | } | |
7d0393cf | 573 | |
4314dea4 | 574 | balance_possible_root_interval (interval); |
a50699fd JA |
575 | |
576 | return new; | |
577 | } | |
578 | \f | |
944d4e4b KH |
579 | /* Return the proper position for the first character |
580 | described by the interval tree SOURCE. | |
581 | This is 1 if the parent is a buffer, | |
582 | 0 if the parent is a string or if there is no parent. | |
583 | ||
584 | Don't use this function on an interval which is the child | |
585 | of another interval! */ | |
586 | ||
fc7bf025 | 587 | static int |
971de7fb | 588 | interval_start_pos (INTERVAL source) |
944d4e4b KH |
589 | { |
590 | Lisp_Object parent; | |
591 | ||
592 | if (NULL_INTERVAL_P (source)) | |
593 | return 0; | |
594 | ||
e0b8c689 KR |
595 | if (! INTERVAL_HAS_OBJECT (source)) |
596 | return 0; | |
439d5cb4 | 597 | GET_INTERVAL_OBJECT (parent, source); |
944d4e4b KH |
598 | if (BUFFERP (parent)) |
599 | return BUF_BEG (XBUFFER (parent)); | |
600 | return 0; | |
601 | } | |
602 | ||
90ba40fc | 603 | /* Find the interval containing text position POSITION in the text |
24e3d3bf | 604 | represented by the interval tree TREE. POSITION is a buffer |
944d4e4b KH |
605 | position (starting from 1) or a string index (starting from 0). |
606 | If POSITION is at the end of the buffer or string, | |
607 | return the interval containing the last character. | |
a50699fd | 608 | |
90ba40fc JA |
609 | The `position' field, which is a cache of an interval's position, |
610 | is updated in the interval found. Other functions (e.g., next_interval) | |
7ce503fd | 611 | will update this cache based on the result of find_interval. */ |
90ba40fc | 612 | |
1863bbf8 | 613 | INTERVAL |
d311d28c | 614 | find_interval (register INTERVAL tree, register ptrdiff_t position) |
a50699fd | 615 | { |
24e3d3bf JB |
616 | /* The distance from the left edge of the subtree at TREE |
617 | to POSITION. */ | |
d311d28c | 618 | register ptrdiff_t relative_position; |
a50699fd JA |
619 | |
620 | if (NULL_INTERVAL_P (tree)) | |
621 | return NULL_INTERVAL; | |
622 | ||
944d4e4b | 623 | relative_position = position; |
439d5cb4 KR |
624 | if (INTERVAL_HAS_OBJECT (tree)) |
625 | { | |
626 | Lisp_Object parent; | |
627 | GET_INTERVAL_OBJECT (parent, tree); | |
628 | if (BUFFERP (parent)) | |
629 | relative_position -= BUF_BEG (XBUFFER (parent)); | |
630 | } | |
944d4e4b | 631 | |
cce7fefc | 632 | eassert (relative_position <= TOTAL_LENGTH (tree)); |
a50699fd | 633 | |
52283633 SM |
634 | if (!handling_signal) |
635 | tree = balance_possible_root_interval (tree); | |
4314dea4 | 636 | |
a50699fd JA |
637 | while (1) |
638 | { | |
24e3d3bf | 639 | if (relative_position < LEFT_TOTAL_LENGTH (tree)) |
a50699fd JA |
640 | { |
641 | tree = tree->left; | |
642 | } | |
24e3d3bf JB |
643 | else if (! NULL_RIGHT_CHILD (tree) |
644 | && relative_position >= (TOTAL_LENGTH (tree) | |
645 | - RIGHT_TOTAL_LENGTH (tree))) | |
a50699fd JA |
646 | { |
647 | relative_position -= (TOTAL_LENGTH (tree) | |
648 | - RIGHT_TOTAL_LENGTH (tree)); | |
649 | tree = tree->right; | |
650 | } | |
651 | else | |
652 | { | |
944d4e4b | 653 | tree->position |
4867a283 SM |
654 | = (position - relative_position /* left edge of *tree. */ |
655 | + LEFT_TOTAL_LENGTH (tree)); /* left edge of this interval. */ | |
24e3d3bf | 656 | |
a50699fd JA |
657 | return tree; |
658 | } | |
659 | } | |
660 | } | |
661 | \f | |
662 | /* Find the succeeding interval (lexicographically) to INTERVAL. | |
90ba40fc | 663 | Sets the `position' field based on that of INTERVAL (see |
7ce503fd | 664 | find_interval). */ |
a50699fd JA |
665 | |
666 | INTERVAL | |
971de7fb | 667 | next_interval (register INTERVAL interval) |
a50699fd JA |
668 | { |
669 | register INTERVAL i = interval; | |
d311d28c | 670 | register ptrdiff_t next_position; |
a50699fd JA |
671 | |
672 | if (NULL_INTERVAL_P (i)) | |
673 | return NULL_INTERVAL; | |
674 | next_position = interval->position + LENGTH (interval); | |
675 | ||
676 | if (! NULL_RIGHT_CHILD (i)) | |
677 | { | |
678 | i = i->right; | |
679 | while (! NULL_LEFT_CHILD (i)) | |
680 | i = i->left; | |
681 | ||
682 | i->position = next_position; | |
683 | return i; | |
684 | } | |
685 | ||
686 | while (! NULL_PARENT (i)) | |
687 | { | |
688 | if (AM_LEFT_CHILD (i)) | |
689 | { | |
439d5cb4 | 690 | i = INTERVAL_PARENT (i); |
a50699fd JA |
691 | i->position = next_position; |
692 | return i; | |
693 | } | |
694 | ||
439d5cb4 | 695 | i = INTERVAL_PARENT (i); |
a50699fd JA |
696 | } |
697 | ||
698 | return NULL_INTERVAL; | |
699 | } | |
700 | ||
701 | /* Find the preceding interval (lexicographically) to INTERVAL. | |
90ba40fc | 702 | Sets the `position' field based on that of INTERVAL (see |
7ce503fd | 703 | find_interval). */ |
a50699fd JA |
704 | |
705 | INTERVAL | |
971de7fb | 706 | previous_interval (register INTERVAL interval) |
a50699fd JA |
707 | { |
708 | register INTERVAL i; | |
a50699fd JA |
709 | |
710 | if (NULL_INTERVAL_P (interval)) | |
711 | return NULL_INTERVAL; | |
712 | ||
713 | if (! NULL_LEFT_CHILD (interval)) | |
714 | { | |
715 | i = interval->left; | |
716 | while (! NULL_RIGHT_CHILD (i)) | |
717 | i = i->right; | |
718 | ||
719 | i->position = interval->position - LENGTH (i); | |
720 | return i; | |
721 | } | |
722 | ||
723 | i = interval; | |
724 | while (! NULL_PARENT (i)) | |
725 | { | |
726 | if (AM_RIGHT_CHILD (i)) | |
727 | { | |
439d5cb4 | 728 | i = INTERVAL_PARENT (i); |
a50699fd JA |
729 | |
730 | i->position = interval->position - LENGTH (i); | |
731 | return i; | |
732 | } | |
439d5cb4 | 733 | i = INTERVAL_PARENT (i); |
a50699fd JA |
734 | } |
735 | ||
736 | return NULL_INTERVAL; | |
737 | } | |
25eeac41 RS |
738 | |
739 | /* Find the interval containing POS given some non-NULL INTERVAL | |
75167cd4 | 740 | in the same tree. Note that we need to update interval->position |
52283633 SM |
741 | if we go down the tree. |
742 | To speed up the process, we assume that the ->position of | |
743 | I and all its parents is already uptodate. */ | |
25eeac41 | 744 | INTERVAL |
d311d28c | 745 | update_interval (register INTERVAL i, ptrdiff_t pos) |
25eeac41 RS |
746 | { |
747 | if (NULL_INTERVAL_P (i)) | |
748 | return NULL_INTERVAL; | |
749 | ||
7d0393cf | 750 | while (1) |
25eeac41 | 751 | { |
7d0393cf | 752 | if (pos < i->position) |
25eeac41 RS |
753 | { |
754 | /* Move left. */ | |
7d0393cf | 755 | if (pos >= i->position - TOTAL_LENGTH (i->left)) |
75167cd4 RS |
756 | { |
757 | i->left->position = i->position - TOTAL_LENGTH (i->left) | |
758 | + LEFT_TOTAL_LENGTH (i->left); | |
759 | i = i->left; /* Move to the left child */ | |
760 | } | |
7d0393cf | 761 | else if (NULL_PARENT (i)) |
25eeac41 | 762 | error ("Point before start of properties"); |
7d0393cf | 763 | else |
439d5cb4 | 764 | i = INTERVAL_PARENT (i); |
25eeac41 RS |
765 | continue; |
766 | } | |
767 | else if (pos >= INTERVAL_LAST_POS (i)) | |
768 | { | |
769 | /* Move right. */ | |
7d0393cf | 770 | if (pos < INTERVAL_LAST_POS (i) + TOTAL_LENGTH (i->right)) |
75167cd4 | 771 | { |
70cc95c4 SM |
772 | i->right->position = INTERVAL_LAST_POS (i) |
773 | + LEFT_TOTAL_LENGTH (i->right); | |
75167cd4 RS |
774 | i = i->right; /* Move to the right child */ |
775 | } | |
7d0393cf | 776 | else if (NULL_PARENT (i)) |
7c85f529 | 777 | error ("Point %"pD"d after end of properties", pos); |
7d0393cf | 778 | else |
70cc95c4 | 779 | i = INTERVAL_PARENT (i); |
25eeac41 RS |
780 | continue; |
781 | } | |
7d0393cf | 782 | else |
25eeac41 RS |
783 | return i; |
784 | } | |
785 | } | |
786 | ||
90ba40fc JA |
787 | /* Effect an adjustment corresponding to the addition of LENGTH characters |
788 | of text. Do this by finding the interval containing POSITION in the | |
550bd63a | 789 | interval tree TREE, and then adjusting all of its ancestors by adding |
90ba40fc JA |
790 | LENGTH to them. |
791 | ||
792 | If POSITION is the first character of an interval, meaning that point | |
793 | is actually between the two intervals, make the new text belong to | |
794 | the interval which is "sticky". | |
795 | ||
1d1d7ba0 | 796 | If both intervals are "sticky", then make them belong to the left-most |
90ba40fc | 797 | interval. Another possibility would be to create a new interval for |
7ce503fd | 798 | this text, and make it have the merged properties of both ends. */ |
90ba40fc JA |
799 | |
800 | static INTERVAL | |
e79123aa | 801 | adjust_intervals_for_insertion (INTERVAL tree, |
d311d28c | 802 | ptrdiff_t position, ptrdiff_t length) |
90ba40fc JA |
803 | { |
804 | register INTERVAL i; | |
7ce503fd RS |
805 | register INTERVAL temp; |
806 | int eobp = 0; | |
944d4e4b | 807 | Lisp_Object parent; |
d311d28c | 808 | ptrdiff_t offset; |
7d0393cf | 809 | |
cce7fefc | 810 | eassert (TOTAL_LENGTH (tree) > 0); |
90ba40fc | 811 | |
439d5cb4 | 812 | GET_INTERVAL_OBJECT (parent, tree); |
944d4e4b KH |
813 | offset = (BUFFERP (parent) ? BUF_BEG (XBUFFER (parent)) : 0); |
814 | ||
24e3d3bf JB |
815 | /* If inserting at point-max of a buffer, that position will be out |
816 | of range. Remember that buffer positions are 1-based. */ | |
944d4e4b KH |
817 | if (position >= TOTAL_LENGTH (tree) + offset) |
818 | { | |
819 | position = TOTAL_LENGTH (tree) + offset; | |
820 | eobp = 1; | |
821 | } | |
90ba40fc JA |
822 | |
823 | i = find_interval (tree, position); | |
7ce503fd | 824 | |
2313b945 RS |
825 | /* If in middle of an interval which is not sticky either way, |
826 | we must not just give its properties to the insertion. | |
f56b42ac KH |
827 | So split this interval at the insertion point. |
828 | ||
829 | Originally, the if condition here was this: | |
830 | (! (position == i->position || eobp) | |
831 | && END_NONSTICKY_P (i) | |
832 | && FRONT_NONSTICKY_P (i)) | |
833 | But, these macros are now unreliable because of introduction of | |
834 | Vtext_property_default_nonsticky. So, we always check properties | |
835 | one by one if POSITION is in middle of an interval. */ | |
836 | if (! (position == i->position || eobp)) | |
2313b945 | 837 | { |
ca41a64d RS |
838 | Lisp_Object tail; |
839 | Lisp_Object front, rear; | |
840 | ||
f56b42ac KH |
841 | tail = i->plist; |
842 | ||
843 | /* Properties font-sticky and rear-nonsticky override | |
844 | Vtext_property_default_nonsticky. So, if they are t, we can | |
845 | skip one by one checking of properties. */ | |
846 | rear = textget (i->plist, Qrear_nonsticky); | |
847 | if (! CONSP (rear) && ! NILP (rear)) | |
848 | { | |
849 | /* All properties are nonsticky. We split the interval. */ | |
850 | goto check_done; | |
851 | } | |
ca41a64d | 852 | front = textget (i->plist, Qfront_sticky); |
f56b42ac KH |
853 | if (! CONSP (front) && ! NILP (front)) |
854 | { | |
855 | /* All properties are sticky. We don't split the interval. */ | |
856 | tail = Qnil; | |
857 | goto check_done; | |
858 | } | |
ca41a64d | 859 | |
f56b42ac KH |
860 | /* Does any actual property pose an actual problem? We break |
861 | the loop if we find a nonsticky property. */ | |
862 | for (; CONSP (tail); tail = Fcdr (XCDR (tail))) | |
ca41a64d | 863 | { |
f56b42ac | 864 | Lisp_Object prop, tmp; |
03699b14 | 865 | prop = XCAR (tail); |
ca41a64d | 866 | |
f56b42ac | 867 | /* Is this particular property front-sticky? */ |
ca41a64d RS |
868 | if (CONSP (front) && ! NILP (Fmemq (prop, front))) |
869 | continue; | |
870 | ||
f56b42ac KH |
871 | /* Is this particular property rear-nonsticky? */ |
872 | if (CONSP (rear) && ! NILP (Fmemq (prop, rear))) | |
873 | break; | |
874 | ||
875 | /* Is this particular property recorded as sticky or | |
876 | nonsticky in Vtext_property_default_nonsticky? */ | |
877 | tmp = Fassq (prop, Vtext_property_default_nonsticky); | |
878 | if (CONSP (tmp)) | |
879 | { | |
880 | if (NILP (tmp)) | |
881 | continue; | |
882 | break; | |
883 | } | |
884 | ||
885 | /* By default, a text property is rear-sticky, thus we | |
886 | continue the loop. */ | |
ca41a64d RS |
887 | } |
888 | ||
f56b42ac | 889 | check_done: |
ca41a64d RS |
890 | /* If any property is a real problem, split the interval. */ |
891 | if (! NILP (tail)) | |
892 | { | |
893 | temp = split_interval_right (i, position - i->position); | |
894 | copy_properties (i, temp); | |
895 | i = temp; | |
896 | } | |
2313b945 RS |
897 | } |
898 | ||
90ba40fc | 899 | /* If we are positioned between intervals, check the stickiness of |
7ce503fd RS |
900 | both of them. We have to do this too, if we are at BEG or Z. */ |
901 | if (position == i->position || eobp) | |
90ba40fc | 902 | { |
7ce503fd RS |
903 | register INTERVAL prev; |
904 | ||
905 | if (position == BEG) | |
906 | prev = 0; | |
907 | else if (eobp) | |
908 | { | |
909 | prev = i; | |
910 | i = 0; | |
911 | } | |
912 | else | |
913 | prev = previous_interval (i); | |
90ba40fc | 914 | |
7ce503fd RS |
915 | /* Even if we are positioned between intervals, we default |
916 | to the left one if it exists. We extend it now and split | |
8e6208c5 | 917 | off a part later, if stickiness demands it. */ |
439d5cb4 | 918 | for (temp = prev ? prev : i; temp; temp = INTERVAL_PARENT_OR_NULL (temp)) |
4314dea4 RS |
919 | { |
920 | temp->total_length += length; | |
727fec2d | 921 | CHECK_TOTAL_LENGTH (temp); |
4314dea4 RS |
922 | temp = balance_possible_root_interval (temp); |
923 | } | |
7d0393cf | 924 | |
7ce503fd | 925 | /* If at least one interval has sticky properties, |
f56b42ac KH |
926 | we check the stickiness property by property. |
927 | ||
928 | Originally, the if condition here was this: | |
929 | (END_NONSTICKY_P (prev) || FRONT_STICKY_P (i)) | |
930 | But, these macros are now unreliable because of introduction | |
931 | of Vtext_property_default_nonsticky. So, we always have to | |
932 | check stickiness of properties one by one. If cache of | |
933 | stickiness is implemented in the future, we may be able to | |
934 | use those macros again. */ | |
935 | if (1) | |
7ce503fd | 936 | { |
dd675b05 | 937 | Lisp_Object pleft, pright; |
7ce503fd RS |
938 | struct interval newi; |
939 | ||
0c16dfed | 940 | RESET_INTERVAL (&newi); |
dd675b05 KH |
941 | pleft = NULL_INTERVAL_P (prev) ? Qnil : prev->plist; |
942 | pright = NULL_INTERVAL_P (i) ? Qnil : i->plist; | |
7ce503fd RS |
943 | newi.plist = merge_properties_sticky (pleft, pright); |
944 | ||
ef1900f3 | 945 | if (! prev) /* i.e. position == BEG */ |
7ce503fd RS |
946 | { |
947 | if (! intervals_equal (i, &newi)) | |
948 | { | |
949 | i = split_interval_left (i, length); | |
950 | i->plist = newi.plist; | |
951 | } | |
952 | } | |
953 | else if (! intervals_equal (prev, &newi)) | |
954 | { | |
955 | prev = split_interval_right (prev, | |
956 | position - prev->position); | |
957 | prev->plist = newi.plist; | |
958 | if (! NULL_INTERVAL_P (i) | |
959 | && intervals_equal (prev, i)) | |
960 | merge_interval_right (prev); | |
961 | } | |
962 | ||
963 | /* We will need to update the cache here later. */ | |
964 | } | |
965 | else if (! prev && ! NILP (i->plist)) | |
966 | { | |
967 | /* Just split off a new interval at the left. | |
968 | Since I wasn't front-sticky, the empty plist is ok. */ | |
969 | i = split_interval_left (i, length); | |
970 | } | |
90ba40fc JA |
971 | } |
972 | ||
7ce503fd RS |
973 | /* Otherwise just extend the interval. */ |
974 | else | |
90ba40fc | 975 | { |
439d5cb4 | 976 | for (temp = i; temp; temp = INTERVAL_PARENT_OR_NULL (temp)) |
4314dea4 RS |
977 | { |
978 | temp->total_length += length; | |
727fec2d | 979 | CHECK_TOTAL_LENGTH (temp); |
4314dea4 RS |
980 | temp = balance_possible_root_interval (temp); |
981 | } | |
90ba40fc | 982 | } |
7d0393cf | 983 | |
90ba40fc JA |
984 | return tree; |
985 | } | |
7ce503fd | 986 | |
45d82bdc KH |
987 | /* Any property might be front-sticky on the left, rear-sticky on the left, |
988 | front-sticky on the right, or rear-sticky on the right; the 16 combinations | |
989 | can be arranged in a matrix with rows denoting the left conditions and | |
990 | columns denoting the right conditions: | |
991 | _ __ _ | |
992 | _ FR FR FR FR | |
993 | FR__ 0 1 2 3 | |
994 | _FR 4 5 6 7 | |
995 | FR 8 9 A B | |
996 | FR C D E F | |
997 | ||
998 | left-props = '(front-sticky (p8 p9 pa pb pc pd pe pf) | |
999 | rear-nonsticky (p4 p5 p6 p7 p8 p9 pa pb) | |
1000 | p0 L p1 L p2 L p3 L p4 L p5 L p6 L p7 L | |
1001 | p8 L p9 L pa L pb L pc L pd L pe L pf L) | |
1002 | right-props = '(front-sticky (p2 p3 p6 p7 pa pb pe pf) | |
1003 | rear-nonsticky (p1 p2 p5 p6 p9 pa pd pe) | |
1004 | p0 R p1 R p2 R p3 R p4 R p5 R p6 R p7 R | |
1005 | p8 R p9 R pa R pb R pc R pd R pe R pf R) | |
1006 | ||
1007 | We inherit from whoever has a sticky side facing us. If both sides | |
1008 | do (cases 2, 3, E, and F), then we inherit from whichever side has a | |
1009 | non-nil value for the current property. If both sides do, then we take | |
1010 | from the left. | |
1011 | ||
1012 | When we inherit a property, we get its stickiness as well as its value. | |
1013 | So, when we merge the above two lists, we expect to get this: | |
1014 | ||
1015 | result = '(front-sticky (p6 p7 pa pb pc pd pe pf) | |
1016 | rear-nonsticky (p6 pa) | |
1017 | p0 L p1 L p2 L p3 L p6 R p7 R | |
1018 | pa R pb R pc L pd L pe L pf L) | |
1019 | ||
1020 | The optimizable special cases are: | |
1021 | left rear-nonsticky = nil, right front-sticky = nil (inherit left) | |
1022 | left rear-nonsticky = t, right front-sticky = t (inherit right) | |
1023 | left rear-nonsticky = t, right front-sticky = nil (inherit none) | |
1024 | */ | |
1025 | ||
93ea6e8f | 1026 | static Lisp_Object |
971de7fb | 1027 | merge_properties_sticky (Lisp_Object pleft, Lisp_Object pright) |
7ce503fd | 1028 | { |
dd675b05 KH |
1029 | register Lisp_Object props, front, rear; |
1030 | Lisp_Object lfront, lrear, rfront, rrear; | |
4ab19eb3 | 1031 | register Lisp_Object tail1, tail2, sym, lval, rval, cat; |
45d82bdc | 1032 | int use_left, use_right; |
4ab19eb3 | 1033 | int lpresent; |
7ce503fd | 1034 | |
dd675b05 KH |
1035 | props = Qnil; |
1036 | front = Qnil; | |
1037 | rear = Qnil; | |
1038 | lfront = textget (pleft, Qfront_sticky); | |
1039 | lrear = textget (pleft, Qrear_nonsticky); | |
1040 | rfront = textget (pright, Qfront_sticky); | |
1041 | rrear = textget (pright, Qrear_nonsticky); | |
1042 | ||
45d82bdc | 1043 | /* Go through each element of PRIGHT. */ |
4867a283 | 1044 | for (tail1 = pright; CONSP (tail1); tail1 = Fcdr (XCDR (tail1))) |
7ce503fd | 1045 | { |
f56b42ac KH |
1046 | Lisp_Object tmp; |
1047 | ||
4867a283 | 1048 | sym = XCAR (tail1); |
7ce503fd RS |
1049 | |
1050 | /* Sticky properties get special treatment. */ | |
1051 | if (EQ (sym, Qrear_nonsticky) || EQ (sym, Qfront_sticky)) | |
1052 | continue; | |
45d82bdc | 1053 | |
4867a283 SM |
1054 | rval = Fcar (XCDR (tail1)); |
1055 | for (tail2 = pleft; CONSP (tail2); tail2 = Fcdr (XCDR (tail2))) | |
1056 | if (EQ (sym, XCAR (tail2))) | |
45d82bdc | 1057 | break; |
45d82bdc | 1058 | |
4ab19eb3 RS |
1059 | /* Indicate whether the property is explicitly defined on the left. |
1060 | (We know it is defined explicitly on the right | |
1061 | because otherwise we don't get here.) */ | |
1062 | lpresent = ! NILP (tail2); | |
1063 | lval = (NILP (tail2) ? Qnil : Fcar (Fcdr (tail2))); | |
1064 | ||
f56b42ac KH |
1065 | /* Even if lrear or rfront say nothing about the stickiness of |
1066 | SYM, Vtext_property_default_nonsticky may give default | |
1067 | stickiness to SYM. */ | |
1068 | tmp = Fassq (sym, Vtext_property_default_nonsticky); | |
1069 | use_left = (lpresent | |
1070 | && ! (TMEM (sym, lrear) | |
3a62677f | 1071 | || (CONSP (tmp) && ! NILP (XCDR (tmp))))); |
f56b42ac KH |
1072 | use_right = (TMEM (sym, rfront) |
1073 | || (CONSP (tmp) && NILP (XCDR (tmp)))); | |
45d82bdc KH |
1074 | if (use_left && use_right) |
1075 | { | |
4ab19eb3 RS |
1076 | if (NILP (lval)) |
1077 | use_left = 0; | |
1078 | else if (NILP (rval)) | |
1079 | use_right = 0; | |
45d82bdc KH |
1080 | } |
1081 | if (use_left) | |
7ce503fd | 1082 | { |
45d82bdc KH |
1083 | /* We build props as (value sym ...) rather than (sym value ...) |
1084 | because we plan to nreverse it when we're done. */ | |
4ab19eb3 | 1085 | props = Fcons (lval, Fcons (sym, props)); |
45d82bdc | 1086 | if (TMEM (sym, lfront)) |
7ce503fd | 1087 | front = Fcons (sym, front); |
45d82bdc KH |
1088 | if (TMEM (sym, lrear)) |
1089 | rear = Fcons (sym, rear); | |
7ce503fd | 1090 | } |
45d82bdc | 1091 | else if (use_right) |
7ce503fd | 1092 | { |
4ab19eb3 | 1093 | props = Fcons (rval, Fcons (sym, props)); |
45d82bdc KH |
1094 | if (TMEM (sym, rfront)) |
1095 | front = Fcons (sym, front); | |
1096 | if (TMEM (sym, rrear)) | |
1097 | rear = Fcons (sym, rear); | |
7ce503fd RS |
1098 | } |
1099 | } | |
45d82bdc KH |
1100 | |
1101 | /* Now go through each element of PLEFT. */ | |
4867a283 | 1102 | for (tail2 = pleft; CONSP (tail2); tail2 = Fcdr (XCDR (tail2))) |
7ce503fd | 1103 | { |
f56b42ac KH |
1104 | Lisp_Object tmp; |
1105 | ||
4867a283 | 1106 | sym = XCAR (tail2); |
7ce503fd RS |
1107 | |
1108 | /* Sticky properties get special treatment. */ | |
1109 | if (EQ (sym, Qrear_nonsticky) || EQ (sym, Qfront_sticky)) | |
1110 | continue; | |
1111 | ||
45d82bdc | 1112 | /* If sym is in PRIGHT, we've already considered it. */ |
4867a283 SM |
1113 | for (tail1 = pright; CONSP (tail1); tail1 = Fcdr (XCDR (tail1))) |
1114 | if (EQ (sym, XCAR (tail1))) | |
7ce503fd | 1115 | break; |
45d82bdc KH |
1116 | if (! NILP (tail1)) |
1117 | continue; | |
1118 | ||
4867a283 | 1119 | lval = Fcar (XCDR (tail2)); |
45d82bdc | 1120 | |
f56b42ac KH |
1121 | /* Even if lrear or rfront say nothing about the stickiness of |
1122 | SYM, Vtext_property_default_nonsticky may give default | |
1123 | stickiness to SYM. */ | |
1124 | tmp = Fassq (sym, Vtext_property_default_nonsticky); | |
1125 | ||
45d82bdc | 1126 | /* Since rval is known to be nil in this loop, the test simplifies. */ |
f56b42ac | 1127 | if (! (TMEM (sym, lrear) || (CONSP (tmp) && ! NILP (XCDR (tmp))))) |
7ce503fd | 1128 | { |
4ab19eb3 | 1129 | props = Fcons (lval, Fcons (sym, props)); |
45d82bdc KH |
1130 | if (TMEM (sym, lfront)) |
1131 | front = Fcons (sym, front); | |
1132 | } | |
f56b42ac | 1133 | else if (TMEM (sym, rfront) || (CONSP (tmp) && NILP (XCDR (tmp)))) |
45d82bdc KH |
1134 | { |
1135 | /* The value is nil, but we still inherit the stickiness | |
1136 | from the right. */ | |
7ce503fd | 1137 | front = Fcons (sym, front); |
45d82bdc | 1138 | if (TMEM (sym, rrear)) |
7ce503fd RS |
1139 | rear = Fcons (sym, rear); |
1140 | } | |
1141 | } | |
550bd63a | 1142 | props = Fnreverse (props); |
7ce503fd | 1143 | if (! NILP (rear)) |
550bd63a | 1144 | props = Fcons (Qrear_nonsticky, Fcons (Fnreverse (rear), props)); |
4ab19eb3 RS |
1145 | |
1146 | cat = textget (props, Qcategory); | |
1147 | if (! NILP (front) | |
7d0393cf | 1148 | && |
4ab19eb3 RS |
1149 | /* If we have inherited a front-stick category property that is t, |
1150 | we don't need to set up a detailed one. */ | |
1151 | ! (! NILP (cat) && SYMBOLP (cat) | |
1152 | && EQ (Fget (cat, Qfront_sticky), Qt))) | |
45d82bdc | 1153 | props = Fcons (Qfront_sticky, Fcons (Fnreverse (front), props)); |
7ce503fd | 1154 | return props; |
7ce503fd RS |
1155 | } |
1156 | ||
a50699fd | 1157 | \f |
7d0393cf | 1158 | /* Delete a node I from its interval tree by merging its subtrees |
90ba40fc | 1159 | into one subtree which is then returned. Caller is responsible for |
7ce503fd | 1160 | storing the resulting subtree into its parent. */ |
a50699fd JA |
1161 | |
1162 | static INTERVAL | |
971de7fb | 1163 | delete_node (register INTERVAL i) |
a50699fd JA |
1164 | { |
1165 | register INTERVAL migrate, this; | |
d311d28c | 1166 | register ptrdiff_t migrate_amt; |
a50699fd JA |
1167 | |
1168 | if (NULL_INTERVAL_P (i->left)) | |
1169 | return i->right; | |
1170 | if (NULL_INTERVAL_P (i->right)) | |
1171 | return i->left; | |
1172 | ||
1173 | migrate = i->left; | |
1174 | migrate_amt = i->left->total_length; | |
1175 | this = i->right; | |
1176 | this->total_length += migrate_amt; | |
1177 | while (! NULL_INTERVAL_P (this->left)) | |
1178 | { | |
1179 | this = this->left; | |
1180 | this->total_length += migrate_amt; | |
1181 | } | |
727fec2d | 1182 | CHECK_TOTAL_LENGTH (this); |
a50699fd | 1183 | this->left = migrate; |
439d5cb4 | 1184 | SET_INTERVAL_PARENT (migrate, this); |
a50699fd JA |
1185 | |
1186 | return i->right; | |
1187 | } | |
1188 | ||
1189 | /* Delete interval I from its tree by calling `delete_node' | |
1190 | and properly connecting the resultant subtree. | |
1191 | ||
1192 | I is presumed to be empty; that is, no adjustments are made | |
7ce503fd | 1193 | for the length of I. */ |
a50699fd | 1194 | |
93ea6e8f | 1195 | static void |
971de7fb | 1196 | delete_interval (register INTERVAL i) |
a50699fd JA |
1197 | { |
1198 | register INTERVAL parent; | |
d311d28c | 1199 | ptrdiff_t amt = LENGTH (i); |
a50699fd | 1200 | |
cce7fefc | 1201 | eassert (amt == 0); /* Only used on zero-length intervals now. */ |
a50699fd JA |
1202 | |
1203 | if (ROOT_INTERVAL_P (i)) | |
1204 | { | |
dd675b05 | 1205 | Lisp_Object owner; |
439d5cb4 | 1206 | GET_INTERVAL_OBJECT (owner, i); |
a50699fd JA |
1207 | parent = delete_node (i); |
1208 | if (! NULL_INTERVAL_P (parent)) | |
439d5cb4 | 1209 | SET_INTERVAL_OBJECT (parent, owner); |
a50699fd | 1210 | |
b629dd47 | 1211 | if (BUFFERP (owner)) |
e5d967c9 | 1212 | BUF_INTERVALS (XBUFFER (owner)) = parent; |
b629dd47 | 1213 | else if (STRINGP (owner)) |
b13738b6 | 1214 | STRING_SET_INTERVALS (owner, parent); |
a50699fd JA |
1215 | else |
1216 | abort (); | |
1217 | ||
1218 | return; | |
1219 | } | |
1220 | ||
439d5cb4 | 1221 | parent = INTERVAL_PARENT (i); |
a50699fd JA |
1222 | if (AM_LEFT_CHILD (i)) |
1223 | { | |
1224 | parent->left = delete_node (i); | |
1225 | if (! NULL_INTERVAL_P (parent->left)) | |
439d5cb4 | 1226 | SET_INTERVAL_PARENT (parent->left, parent); |
a50699fd JA |
1227 | } |
1228 | else | |
1229 | { | |
1230 | parent->right = delete_node (i); | |
1231 | if (! NULL_INTERVAL_P (parent->right)) | |
439d5cb4 | 1232 | SET_INTERVAL_PARENT (parent->right, parent); |
a50699fd JA |
1233 | } |
1234 | } | |
1235 | \f | |
24e3d3bf JB |
1236 | /* Find the interval in TREE corresponding to the relative position |
1237 | FROM and delete as much as possible of AMOUNT from that interval. | |
1238 | Return the amount actually deleted, and if the interval was | |
1239 | zeroed-out, delete that interval node from the tree. | |
1240 | ||
1241 | Note that FROM is actually origin zero, aka relative to the | |
1242 | leftmost edge of tree. This is appropriate since we call ourselves | |
1243 | recursively on subtrees. | |
a50699fd | 1244 | |
1d1d7ba0 | 1245 | Do this by recursing down TREE to the interval in question, and |
7ce503fd | 1246 | deleting the appropriate amount of text. */ |
a50699fd | 1247 | |
d311d28c PE |
1248 | static ptrdiff_t |
1249 | interval_deletion_adjustment (register INTERVAL tree, register ptrdiff_t from, | |
1250 | register ptrdiff_t amount) | |
a50699fd | 1251 | { |
d311d28c | 1252 | register ptrdiff_t relative_position = from; |
a50699fd JA |
1253 | |
1254 | if (NULL_INTERVAL_P (tree)) | |
1255 | return 0; | |
1256 | ||
b50a28de | 1257 | /* Left branch. */ |
24e3d3bf | 1258 | if (relative_position < LEFT_TOTAL_LENGTH (tree)) |
a50699fd | 1259 | { |
d311d28c | 1260 | ptrdiff_t subtract = interval_deletion_adjustment (tree->left, |
c20db43f PE |
1261 | relative_position, |
1262 | amount); | |
a50699fd | 1263 | tree->total_length -= subtract; |
727fec2d | 1264 | CHECK_TOTAL_LENGTH (tree); |
a50699fd JA |
1265 | return subtract; |
1266 | } | |
b50a28de | 1267 | /* Right branch. */ |
24e3d3bf JB |
1268 | else if (relative_position >= (TOTAL_LENGTH (tree) |
1269 | - RIGHT_TOTAL_LENGTH (tree))) | |
a50699fd | 1270 | { |
d311d28c | 1271 | ptrdiff_t subtract; |
a50699fd JA |
1272 | |
1273 | relative_position -= (tree->total_length | |
1274 | - RIGHT_TOTAL_LENGTH (tree)); | |
1275 | subtract = interval_deletion_adjustment (tree->right, | |
1276 | relative_position, | |
1277 | amount); | |
1278 | tree->total_length -= subtract; | |
727fec2d | 1279 | CHECK_TOTAL_LENGTH (tree); |
a50699fd JA |
1280 | return subtract; |
1281 | } | |
7ce503fd | 1282 | /* Here -- this node. */ |
a50699fd JA |
1283 | else |
1284 | { | |
24e3d3bf | 1285 | /* How much can we delete from this interval? */ |
d311d28c | 1286 | ptrdiff_t my_amount = ((tree->total_length |
e79123aa EZ |
1287 | - RIGHT_TOTAL_LENGTH (tree)) |
1288 | - relative_position); | |
24e3d3bf JB |
1289 | |
1290 | if (amount > my_amount) | |
1291 | amount = my_amount; | |
1292 | ||
1293 | tree->total_length -= amount; | |
727fec2d | 1294 | CHECK_TOTAL_LENGTH (tree); |
24e3d3bf JB |
1295 | if (LENGTH (tree) == 0) |
1296 | delete_interval (tree); | |
7d0393cf | 1297 | |
24e3d3bf | 1298 | return amount; |
a50699fd JA |
1299 | } |
1300 | ||
7ce503fd | 1301 | /* Never reach here. */ |
a50699fd JA |
1302 | } |
1303 | ||
24e3d3bf JB |
1304 | /* Effect the adjustments necessary to the interval tree of BUFFER to |
1305 | correspond to the deletion of LENGTH characters from that buffer | |
1306 | text. The deletion is effected at position START (which is a | |
7ce503fd | 1307 | buffer position, i.e. origin 1). */ |
1d1d7ba0 | 1308 | |
a50699fd | 1309 | static void |
e79123aa | 1310 | adjust_intervals_for_deletion (struct buffer *buffer, |
d311d28c | 1311 | ptrdiff_t start, ptrdiff_t length) |
a50699fd | 1312 | { |
d311d28c | 1313 | register ptrdiff_t left_to_delete = length; |
e5d967c9 | 1314 | register INTERVAL tree = BUF_INTERVALS (buffer); |
944d4e4b | 1315 | Lisp_Object parent; |
d311d28c | 1316 | ptrdiff_t offset; |
944d4e4b | 1317 | |
439d5cb4 | 1318 | GET_INTERVAL_OBJECT (parent, tree); |
944d4e4b | 1319 | offset = (BUFFERP (parent) ? BUF_BEG (XBUFFER (parent)) : 0); |
a50699fd JA |
1320 | |
1321 | if (NULL_INTERVAL_P (tree)) | |
1322 | return; | |
1323 | ||
cce7fefc DA |
1324 | eassert (start <= offset + TOTAL_LENGTH (tree) |
1325 | && start + length <= offset + TOTAL_LENGTH (tree)); | |
24e3d3bf | 1326 | |
a50699fd JA |
1327 | if (length == TOTAL_LENGTH (tree)) |
1328 | { | |
e5d967c9 | 1329 | BUF_INTERVALS (buffer) = NULL_INTERVAL; |
a50699fd JA |
1330 | return; |
1331 | } | |
1332 | ||
1333 | if (ONLY_INTERVAL_P (tree)) | |
1334 | { | |
1335 | tree->total_length -= length; | |
727fec2d | 1336 | CHECK_TOTAL_LENGTH (tree); |
a50699fd JA |
1337 | return; |
1338 | } | |
1339 | ||
944d4e4b KH |
1340 | if (start > offset + TOTAL_LENGTH (tree)) |
1341 | start = offset + TOTAL_LENGTH (tree); | |
a50699fd JA |
1342 | while (left_to_delete > 0) |
1343 | { | |
944d4e4b | 1344 | left_to_delete -= interval_deletion_adjustment (tree, start - offset, |
a50699fd | 1345 | left_to_delete); |
e5d967c9 | 1346 | tree = BUF_INTERVALS (buffer); |
a50699fd JA |
1347 | if (left_to_delete == tree->total_length) |
1348 | { | |
e5d967c9 | 1349 | BUF_INTERVALS (buffer) = NULL_INTERVAL; |
a50699fd JA |
1350 | return; |
1351 | } | |
1352 | } | |
1353 | } | |
1354 | \f | |
eb8c3be9 | 1355 | /* Make the adjustments necessary to the interval tree of BUFFER to |
1d1d7ba0 JA |
1356 | represent an addition or deletion of LENGTH characters starting |
1357 | at position START. Addition or deletion is indicated by the sign | |
a9041e6c | 1358 | of LENGTH. |
a50699fd | 1359 | |
a9041e6c PE |
1360 | The two inline functions (one static) pacify Sun C 5.8, a pre-C99 |
1361 | compiler that does not allow calling a static function (here, | |
1362 | adjust_intervals_for_deletion) from a non-static inline function. */ | |
1363 | ||
09db192c | 1364 | void |
9898bd0e | 1365 | offset_intervals (struct buffer *buffer, ptrdiff_t start, ptrdiff_t length) |
a50699fd | 1366 | { |
e5d967c9 | 1367 | if (NULL_INTERVAL_P (BUF_INTERVALS (buffer)) || length == 0) |
a50699fd JA |
1368 | return; |
1369 | ||
1370 | if (length > 0) | |
e5d967c9 | 1371 | adjust_intervals_for_insertion (BUF_INTERVALS (buffer), start, length); |
a50699fd | 1372 | else |
37aa2f85 | 1373 | { |
d311d28c | 1374 | IF_LINT (if (length < - TYPE_MAXIMUM (ptrdiff_t)) abort ();) |
37aa2f85 PE |
1375 | adjust_intervals_for_deletion (buffer, start, -length); |
1376 | } | |
a50699fd | 1377 | } |
9c79dd1b JA |
1378 | \f |
1379 | /* Merge interval I with its lexicographic successor. The resulting | |
1380 | interval is returned, and has the properties of the original | |
1381 | successor. The properties of I are lost. I is removed from the | |
1382 | interval tree. | |
1383 | ||
1384 | IMPORTANT: | |
1385 | The caller must verify that this is not the last (rightmost) | |
7ce503fd | 1386 | interval. */ |
9c79dd1b | 1387 | |
93ea6e8f | 1388 | static INTERVAL |
971de7fb | 1389 | merge_interval_right (register INTERVAL i) |
9c79dd1b | 1390 | { |
d311d28c | 1391 | register ptrdiff_t absorb = LENGTH (i); |
9c79dd1b JA |
1392 | register INTERVAL successor; |
1393 | ||
7ce503fd | 1394 | /* Zero out this interval. */ |
9c79dd1b | 1395 | i->total_length -= absorb; |
727fec2d | 1396 | CHECK_TOTAL_LENGTH (i); |
9c79dd1b | 1397 | |
7ce503fd | 1398 | /* Find the succeeding interval. */ |
9c79dd1b | 1399 | if (! NULL_RIGHT_CHILD (i)) /* It's below us. Add absorb |
7ce503fd | 1400 | as we descend. */ |
9c79dd1b JA |
1401 | { |
1402 | successor = i->right; | |
1403 | while (! NULL_LEFT_CHILD (successor)) | |
1404 | { | |
1405 | successor->total_length += absorb; | |
727fec2d | 1406 | CHECK_TOTAL_LENGTH (successor); |
9c79dd1b JA |
1407 | successor = successor->left; |
1408 | } | |
1409 | ||
1410 | successor->total_length += absorb; | |
727fec2d | 1411 | CHECK_TOTAL_LENGTH (successor); |
9c79dd1b JA |
1412 | delete_interval (i); |
1413 | return successor; | |
1414 | } | |
1415 | ||
1416 | successor = i; | |
1417 | while (! NULL_PARENT (successor)) /* It's above us. Subtract as | |
7ce503fd | 1418 | we ascend. */ |
9c79dd1b JA |
1419 | { |
1420 | if (AM_LEFT_CHILD (successor)) | |
1421 | { | |
439d5cb4 | 1422 | successor = INTERVAL_PARENT (successor); |
9c79dd1b JA |
1423 | delete_interval (i); |
1424 | return successor; | |
1425 | } | |
1426 | ||
439d5cb4 | 1427 | successor = INTERVAL_PARENT (successor); |
9c79dd1b | 1428 | successor->total_length -= absorb; |
727fec2d | 1429 | CHECK_TOTAL_LENGTH (successor); |
9c79dd1b JA |
1430 | } |
1431 | ||
1432 | /* This must be the rightmost or last interval and cannot | |
7ce503fd | 1433 | be merged right. The caller should have known. */ |
9c79dd1b JA |
1434 | abort (); |
1435 | } | |
1436 | \f | |
1437 | /* Merge interval I with its lexicographic predecessor. The resulting | |
1438 | interval is returned, and has the properties of the original predecessor. | |
1439 | The properties of I are lost. Interval node I is removed from the tree. | |
1440 | ||
1441 | IMPORTANT: | |
7ce503fd | 1442 | The caller must verify that this is not the first (leftmost) interval. */ |
9c79dd1b JA |
1443 | |
1444 | INTERVAL | |
971de7fb | 1445 | merge_interval_left (register INTERVAL i) |
9c79dd1b | 1446 | { |
d311d28c | 1447 | register ptrdiff_t absorb = LENGTH (i); |
9c79dd1b JA |
1448 | register INTERVAL predecessor; |
1449 | ||
7ce503fd | 1450 | /* Zero out this interval. */ |
9c79dd1b | 1451 | i->total_length -= absorb; |
727fec2d | 1452 | CHECK_TOTAL_LENGTH (i); |
9c79dd1b | 1453 | |
7ce503fd | 1454 | /* Find the preceding interval. */ |
9c79dd1b | 1455 | if (! NULL_LEFT_CHILD (i)) /* It's below us. Go down, |
7ce503fd | 1456 | adding ABSORB as we go. */ |
9c79dd1b JA |
1457 | { |
1458 | predecessor = i->left; | |
1459 | while (! NULL_RIGHT_CHILD (predecessor)) | |
1460 | { | |
1461 | predecessor->total_length += absorb; | |
727fec2d | 1462 | CHECK_TOTAL_LENGTH (predecessor); |
9c79dd1b JA |
1463 | predecessor = predecessor->right; |
1464 | } | |
1465 | ||
1466 | predecessor->total_length += absorb; | |
727fec2d | 1467 | CHECK_TOTAL_LENGTH (predecessor); |
9c79dd1b JA |
1468 | delete_interval (i); |
1469 | return predecessor; | |
1470 | } | |
1471 | ||
1472 | predecessor = i; | |
1473 | while (! NULL_PARENT (predecessor)) /* It's above us. Go up, | |
7ce503fd | 1474 | subtracting ABSORB. */ |
9c79dd1b JA |
1475 | { |
1476 | if (AM_RIGHT_CHILD (predecessor)) | |
1477 | { | |
439d5cb4 | 1478 | predecessor = INTERVAL_PARENT (predecessor); |
9c79dd1b JA |
1479 | delete_interval (i); |
1480 | return predecessor; | |
1481 | } | |
1482 | ||
439d5cb4 | 1483 | predecessor = INTERVAL_PARENT (predecessor); |
9c79dd1b | 1484 | predecessor->total_length -= absorb; |
727fec2d | 1485 | CHECK_TOTAL_LENGTH (predecessor); |
9c79dd1b | 1486 | } |
a50699fd | 1487 | |
9c79dd1b | 1488 | /* This must be the leftmost or first interval and cannot |
7ce503fd | 1489 | be merged left. The caller should have known. */ |
9c79dd1b JA |
1490 | abort (); |
1491 | } | |
1492 | \f | |
1d1d7ba0 JA |
1493 | /* Make an exact copy of interval tree SOURCE which descends from |
1494 | PARENT. This is done by recursing through SOURCE, copying | |
1495 | the current interval and its properties, and then adjusting | |
7ce503fd | 1496 | the pointers of the copy. */ |
1d1d7ba0 | 1497 | |
a50699fd | 1498 | static INTERVAL |
971de7fb | 1499 | reproduce_tree (INTERVAL source, INTERVAL parent) |
a50699fd JA |
1500 | { |
1501 | register INTERVAL t = make_interval (); | |
1502 | ||
72af86bd | 1503 | memcpy (t, source, INTERVAL_SIZE); |
a50699fd | 1504 | copy_properties (source, t); |
439d5cb4 KR |
1505 | SET_INTERVAL_PARENT (t, parent); |
1506 | if (! NULL_LEFT_CHILD (source)) | |
1507 | t->left = reproduce_tree (source->left, t); | |
1508 | if (! NULL_RIGHT_CHILD (source)) | |
1509 | t->right = reproduce_tree (source->right, t); | |
1510 | ||
1511 | return t; | |
1512 | } | |
1513 | ||
1514 | static INTERVAL | |
971de7fb | 1515 | reproduce_tree_obj (INTERVAL source, Lisp_Object parent) |
439d5cb4 KR |
1516 | { |
1517 | register INTERVAL t = make_interval (); | |
1518 | ||
72af86bd | 1519 | memcpy (t, source, INTERVAL_SIZE); |
439d5cb4 KR |
1520 | copy_properties (source, t); |
1521 | SET_INTERVAL_OBJECT (t, parent); | |
a50699fd JA |
1522 | if (! NULL_LEFT_CHILD (source)) |
1523 | t->left = reproduce_tree (source->left, t); | |
1524 | if (! NULL_RIGHT_CHILD (source)) | |
1525 | t->right = reproduce_tree (source->right, t); | |
1526 | ||
1527 | return t; | |
1528 | } | |
294efdbe | 1529 | \f |
9c79dd1b | 1530 | /* Insert the intervals of SOURCE into BUFFER at POSITION. |
0b79989f | 1531 | LENGTH is the length of the text in SOURCE. |
a50699fd | 1532 | |
944d4e4b KH |
1533 | The `position' field of the SOURCE intervals is assumed to be |
1534 | consistent with its parent; therefore, SOURCE must be an | |
1535 | interval tree made with copy_interval or must be the whole | |
1536 | tree of a buffer or a string. | |
1537 | ||
2bc7a79b JB |
1538 | This is used in insdel.c when inserting Lisp_Strings into the |
1539 | buffer. The text corresponding to SOURCE is already in the buffer | |
1540 | when this is called. The intervals of new tree are a copy of those | |
1541 | belonging to the string being inserted; intervals are never | |
1542 | shared. | |
a50699fd | 1543 | |
0b79989f RS |
1544 | If the inserted text had no intervals associated, and we don't |
1545 | want to inherit the surrounding text's properties, this function | |
a50699fd | 1546 | simply returns -- offset_intervals should handle placing the |
90ba40fc | 1547 | text in the correct interval, depending on the sticky bits. |
a50699fd JA |
1548 | |
1549 | If the inserted text had properties (intervals), then there are two | |
1550 | cases -- either insertion happened in the middle of some interval, | |
1551 | or between two intervals. | |
1552 | ||
1553 | If the text goes into the middle of an interval, then new | |
1554 | intervals are created in the middle with only the properties of | |
1555 | the new text, *unless* the macro MERGE_INSERTIONS is true, in | |
1556 | which case the new text has the union of its properties and those | |
1557 | of the text into which it was inserted. | |
1558 | ||
1559 | If the text goes between two intervals, then if neither interval | |
90ba40fc JA |
1560 | had its appropriate sticky property set (front_sticky, rear_sticky), |
1561 | the new text has only its properties. If one of the sticky properties | |
a50699fd | 1562 | is set, then the new text "sticks" to that region and its properties |
eb8c3be9 | 1563 | depend on merging as above. If both the preceding and succeeding |
90ba40fc JA |
1564 | intervals to the new text are "sticky", then the new text retains |
1565 | only its properties, as if neither sticky property were set. Perhaps | |
a50699fd | 1566 | we should consider merging all three sets of properties onto the new |
7ce503fd | 1567 | text... */ |
a50699fd JA |
1568 | |
1569 | void | |
d311d28c PE |
1570 | graft_intervals_into_buffer (INTERVAL source, ptrdiff_t position, |
1571 | ptrdiff_t length, struct buffer *buffer, | |
e79123aa | 1572 | int inherit) |
a50699fd | 1573 | { |
dc6c6455 | 1574 | register INTERVAL under, over, this; |
e5d967c9 | 1575 | register INTERVAL tree; |
d311d28c | 1576 | ptrdiff_t over_used; |
a50699fd | 1577 | |
e5d967c9 RS |
1578 | tree = BUF_INTERVALS (buffer); |
1579 | ||
34e096ed RS |
1580 | /* If the new text has no properties, then with inheritance it |
1581 | becomes part of whatever interval it was inserted into. | |
1582 | To prevent inheritance, we must clear out the properties | |
1583 | of the newly inserted text. */ | |
9c79dd1b | 1584 | if (NULL_INTERVAL_P (source)) |
0b79989f RS |
1585 | { |
1586 | Lisp_Object buf; | |
201ffa57 | 1587 | if (!inherit && !NULL_INTERVAL_P (tree) && length > 0) |
0b79989f | 1588 | { |
55cfc731 | 1589 | XSETBUFFER (buf, buffer); |
34e096ed RS |
1590 | set_text_properties_1 (make_number (position), |
1591 | make_number (position + length), | |
1592 | Qnil, buf, 0); | |
0b79989f | 1593 | } |
e5d967c9 | 1594 | if (! NULL_INTERVAL_P (BUF_INTERVALS (buffer))) |
b50a28de | 1595 | /* Shouldn't be necessary. --Stef */ |
e5d967c9 | 1596 | BUF_INTERVALS (buffer) = balance_an_interval (BUF_INTERVALS (buffer)); |
0b79989f RS |
1597 | return; |
1598 | } | |
a50699fd | 1599 | |
b50a28de SM |
1600 | eassert (length == TOTAL_LENGTH (source)); |
1601 | ||
1602 | if ((BUF_Z (buffer) - BUF_BEG (buffer)) == length) | |
1603 | { /* The inserted text constitutes the whole buffer, so | |
7ce503fd | 1604 | simply copy over the interval structure. */ |
b8e4857c | 1605 | Lisp_Object buf; |
55cfc731 | 1606 | XSETBUFFER (buf, buffer); |
439d5cb4 | 1607 | BUF_INTERVALS (buffer) = reproduce_tree_obj (source, buf); |
b50a28de SM |
1608 | BUF_INTERVALS (buffer)->position = BUF_BEG (buffer); |
1609 | eassert (BUF_INTERVALS (buffer)->up_obj == 1); | |
a50699fd JA |
1610 | return; |
1611 | } | |
b50a28de SM |
1612 | else if (NULL_INTERVAL_P (tree)) |
1613 | { /* Create an interval tree in which to place a copy | |
7ce503fd | 1614 | of the intervals of the inserted string. */ |
249a6da9 | 1615 | Lisp_Object buf; |
55cfc731 | 1616 | XSETBUFFER (buf, buffer); |
323a7ad4 | 1617 | tree = create_root_interval (buf); |
a50699fd | 1618 | } |
cce7fefc DA |
1619 | /* Paranoia -- the text has already been added, so |
1620 | this buffer should be of non-zero length. */ | |
1621 | eassert (TOTAL_LENGTH (tree) > 0); | |
a50699fd JA |
1622 | |
1623 | this = under = find_interval (tree, position); | |
cce7fefc | 1624 | eassert (!NULL_INTERVAL_P (under)); |
944d4e4b | 1625 | over = find_interval (source, interval_start_pos (source)); |
a50699fd | 1626 | |
323a7ad4 RS |
1627 | /* Here for insertion in the middle of an interval. |
1628 | Split off an equivalent interval to the right, | |
1629 | then don't bother with it any more. */ | |
a50699fd | 1630 | |
323a7ad4 | 1631 | if (position > under->position) |
a50699fd JA |
1632 | { |
1633 | INTERVAL end_unchanged | |
2bc7a79b | 1634 | = split_interval_left (this, position - under->position); |
a50699fd | 1635 | copy_properties (under, end_unchanged); |
323a7ad4 | 1636 | under->position = position; |
a50699fd | 1637 | } |
323a7ad4 RS |
1638 | else |
1639 | { | |
f56b42ac KH |
1640 | /* This call may have some effect because previous_interval may |
1641 | update `position' fields of intervals. Thus, don't ignore it | |
1642 | for the moment. Someone please tell me the truth (K.Handa). */ | |
dc6c6455 PE |
1643 | INTERVAL prev = previous_interval (under); |
1644 | (void) prev; | |
f56b42ac KH |
1645 | #if 0 |
1646 | /* But, this code surely has no effect. And, anyway, | |
1647 | END_NONSTICKY_P is unreliable now. */ | |
7ce503fd | 1648 | if (prev && !END_NONSTICKY_P (prev)) |
323a7ad4 | 1649 | prev = 0; |
f56b42ac | 1650 | #endif /* 0 */ |
323a7ad4 RS |
1651 | } |
1652 | ||
1653 | /* Insertion is now at beginning of UNDER. */ | |
a50699fd | 1654 | |
323a7ad4 | 1655 | /* The inserted text "sticks" to the interval `under', |
7ce503fd RS |
1656 | which means it gets those properties. |
1657 | The properties of under are the result of | |
8e6208c5 | 1658 | adjust_intervals_for_insertion, so stickiness has |
7ce503fd | 1659 | already been taken care of. */ |
7d0393cf | 1660 | |
6b61353c KH |
1661 | /* OVER is the interval we are copying from next. |
1662 | OVER_USED says how many characters' worth of OVER | |
1663 | have already been copied into target intervals. | |
1664 | UNDER is the next interval in the target. */ | |
1665 | over_used = 0; | |
a50699fd JA |
1666 | while (! NULL_INTERVAL_P (over)) |
1667 | { | |
6b61353c KH |
1668 | /* If UNDER is longer than OVER, split it. */ |
1669 | if (LENGTH (over) - over_used < LENGTH (under)) | |
7ce503fd | 1670 | { |
6b61353c | 1671 | this = split_interval_left (under, LENGTH (over) - over_used); |
7ce503fd RS |
1672 | copy_properties (under, this); |
1673 | } | |
323a7ad4 RS |
1674 | else |
1675 | this = under; | |
6b61353c KH |
1676 | |
1677 | /* THIS is now the interval to copy or merge into. | |
1678 | OVER covers all of it. */ | |
7ea69158 | 1679 | if (inherit) |
7ce503fd RS |
1680 | merge_properties (over, this); |
1681 | else | |
1682 | copy_properties (over, this); | |
6b61353c KH |
1683 | |
1684 | /* If THIS and OVER end at the same place, | |
1685 | advance OVER to a new source interval. */ | |
1686 | if (LENGTH (this) == LENGTH (over) - over_used) | |
1687 | { | |
1688 | over = next_interval (over); | |
1689 | over_used = 0; | |
1690 | } | |
1691 | else | |
1692 | /* Otherwise just record that more of OVER has been used. */ | |
1693 | over_used += LENGTH (this); | |
1694 | ||
1695 | /* Always advance to a new target interval. */ | |
1696 | under = next_interval (this); | |
a50699fd JA |
1697 | } |
1698 | ||
e5d967c9 RS |
1699 | if (! NULL_INTERVAL_P (BUF_INTERVALS (buffer))) |
1700 | BUF_INTERVALS (buffer) = balance_an_interval (BUF_INTERVALS (buffer)); | |
a50699fd JA |
1701 | return; |
1702 | } | |
1703 | ||
5cae0ec6 RS |
1704 | /* Get the value of property PROP from PLIST, |
1705 | which is the plist of an interval. | |
7d0393cf | 1706 | We check for direct properties, for categories with property PROP, |
06d92327 | 1707 | and for PROP appearing on the default-text-properties list. */ |
5cae0ec6 RS |
1708 | |
1709 | Lisp_Object | |
971de7fb | 1710 | textget (Lisp_Object plist, register Lisp_Object prop) |
323a7ad4 | 1711 | { |
91b53904 | 1712 | return lookup_char_property (plist, prop, 1); |
948fe32d CW |
1713 | } |
1714 | ||
1715 | Lisp_Object | |
971de7fb | 1716 | lookup_char_property (Lisp_Object plist, register Lisp_Object prop, int textprop) |
948fe32d CW |
1717 | { |
1718 | register Lisp_Object tail, fallback = Qnil; | |
323a7ad4 | 1719 | |
91b53904 | 1720 | for (tail = plist; CONSP (tail); tail = Fcdr (XCDR (tail))) |
323a7ad4 RS |
1721 | { |
1722 | register Lisp_Object tem; | |
91b53904 | 1723 | tem = XCAR (tail); |
323a7ad4 | 1724 | if (EQ (prop, tem)) |
91b53904 | 1725 | return Fcar (XCDR (tail)); |
5cae0ec6 | 1726 | if (EQ (tem, Qcategory)) |
5dd6606e | 1727 | { |
91b53904 | 1728 | tem = Fcar (XCDR (tail)); |
5dd6606e RS |
1729 | if (SYMBOLP (tem)) |
1730 | fallback = Fget (tem, prop); | |
1731 | } | |
323a7ad4 | 1732 | } |
5cae0ec6 | 1733 | |
70743ff1 BG |
1734 | if (! NILP (fallback)) |
1735 | return fallback; | |
948fe32d CW |
1736 | /* Check for alternative properties */ |
1737 | tail = Fassq (prop, Vchar_property_alias_alist); | |
931285e2 LT |
1738 | if (! NILP (tail)) |
1739 | { | |
1740 | tail = XCDR (tail); | |
1741 | for (; NILP (fallback) && CONSP (tail); tail = XCDR (tail)) | |
1742 | fallback = Fplist_get (plist, XCAR (tail)); | |
1743 | } | |
1744 | ||
948fe32d CW |
1745 | if (textprop && NILP (fallback) && CONSP (Vdefault_text_properties)) |
1746 | fallback = Fplist_get (Vdefault_text_properties, prop); | |
1747 | return fallback; | |
323a7ad4 | 1748 | } |
7ce503fd | 1749 | |
294efdbe | 1750 | \f |
ef1900f3 RS |
1751 | /* Set point in BUFFER "temporarily" to CHARPOS, which corresponds to |
1752 | byte position BYTEPOS. */ | |
1753 | ||
09db192c | 1754 | void |
6ba7f443 | 1755 | temp_set_point_both (struct buffer *buffer, |
d311d28c | 1756 | ptrdiff_t charpos, ptrdiff_t bytepos) |
ef1900f3 RS |
1757 | { |
1758 | /* In a single-byte buffer, the two positions must be equal. */ | |
cce7fefc DA |
1759 | if (BUF_ZV (buffer) == BUF_ZV_BYTE (buffer)) |
1760 | eassert (charpos == bytepos); | |
ef1900f3 | 1761 | |
cce7fefc DA |
1762 | eassert (charpos <= bytepos); |
1763 | eassert (charpos <= BUF_ZV (buffer) || BUF_BEGV (buffer) <= charpos); | |
ef1900f3 | 1764 | |
cffc6f3b | 1765 | SET_BUF_PT_BOTH (buffer, charpos, bytepos); |
ef1900f3 RS |
1766 | } |
1767 | ||
f8ab8c1f EZ |
1768 | /* Set point "temporarily", without checking any text properties. */ |
1769 | ||
09db192c | 1770 | void |
d311d28c | 1771 | temp_set_point (struct buffer *buffer, ptrdiff_t charpos) |
f8ab8c1f EZ |
1772 | { |
1773 | temp_set_point_both (buffer, charpos, | |
1774 | buf_charpos_to_bytepos (buffer, charpos)); | |
1775 | } | |
1776 | ||
7d0393cf | 1777 | /* Set point in BUFFER to CHARPOS. If the target position is |
f65013b0 | 1778 | before an intangible character, move to an ok place. */ |
a50699fd JA |
1779 | |
1780 | void | |
d311d28c | 1781 | set_point (ptrdiff_t charpos) |
ef1900f3 | 1782 | { |
6ba7f443 | 1783 | set_point_both (charpos, buf_charpos_to_bytepos (current_buffer, charpos)); |
ef1900f3 RS |
1784 | } |
1785 | ||
f0dcf801 MB |
1786 | /* If there's an invisible character at position POS + TEST_OFFS in the |
1787 | current buffer, and the invisible property has a `stickiness' such that | |
1788 | inserting a character at position POS would inherit the property it, | |
1789 | return POS + ADJ, otherwise return POS. If TEST_INTANG is non-zero, | |
53964682 | 1790 | then intangibility is required as well as invisibility. |
f0dcf801 MB |
1791 | |
1792 | TEST_OFFS should be either 0 or -1, and ADJ should be either 1 or -1. | |
1793 | ||
1794 | Note that `stickiness' is determined by overlay marker insertion types, | |
7d0393cf | 1795 | if the invisible property comes from an overlay. */ |
f0dcf801 | 1796 | |
d311d28c PE |
1797 | static ptrdiff_t |
1798 | adjust_for_invis_intang (ptrdiff_t pos, ptrdiff_t test_offs, ptrdiff_t adj, | |
e79123aa | 1799 | int test_intang) |
f0dcf801 MB |
1800 | { |
1801 | Lisp_Object invis_propval, invis_overlay; | |
1802 | Lisp_Object test_pos; | |
1803 | ||
1804 | if ((adj < 0 && pos + adj < BEGV) || (adj > 0 && pos + adj > ZV)) | |
1805 | /* POS + ADJ would be beyond the buffer bounds, so do no adjustment. */ | |
1806 | return pos; | |
1807 | ||
1808 | test_pos = make_number (pos + test_offs); | |
1809 | ||
1810 | invis_propval | |
1811 | = get_char_property_and_overlay (test_pos, Qinvisible, Qnil, | |
1812 | &invis_overlay); | |
1813 | ||
1814 | if ((!test_intang | |
1815 | || ! NILP (Fget_char_property (test_pos, Qintangible, Qnil))) | |
1816 | && TEXT_PROP_MEANS_INVISIBLE (invis_propval) | |
1817 | /* This next test is true if the invisible property has a stickiness | |
1818 | such that an insertion at POS would inherit it. */ | |
1819 | && (NILP (invis_overlay) | |
1820 | /* Invisible property is from a text-property. */ | |
4867a283 | 1821 | ? (text_property_stickiness (Qinvisible, make_number (pos), Qnil) |
f0dcf801 MB |
1822 | == (test_offs == 0 ? 1 : -1)) |
1823 | /* Invisible property is from an overlay. */ | |
1824 | : (test_offs == 0 | |
1825 | ? XMARKER (OVERLAY_START (invis_overlay))->insertion_type == 0 | |
1826 | : XMARKER (OVERLAY_END (invis_overlay))->insertion_type == 1))) | |
1827 | pos += adj; | |
1828 | ||
1829 | return pos; | |
1830 | } | |
1831 | ||
ef1900f3 | 1832 | /* Set point in BUFFER to CHARPOS, which corresponds to byte |
7d0393cf | 1833 | position BYTEPOS. If the target position is |
ef1900f3 RS |
1834 | before an intangible character, move to an ok place. */ |
1835 | ||
1836 | void | |
d311d28c | 1837 | set_point_both (ptrdiff_t charpos, ptrdiff_t bytepos) |
a50699fd | 1838 | { |
e39adcda | 1839 | register INTERVAL to, from, toprev, fromprev; |
d311d28c PE |
1840 | ptrdiff_t buffer_point; |
1841 | ptrdiff_t old_position = PT; | |
594a1605 CY |
1842 | /* This ensures that we move forward past intangible text when the |
1843 | initial position is the same as the destination, in the rare | |
1844 | instances where this is important, e.g. in line-move-finish | |
1845 | (simple.el). */ | |
ef1900f3 | 1846 | int backwards = (charpos < old_position ? 1 : 0); |
580fae94 | 1847 | int have_overlays; |
d311d28c | 1848 | ptrdiff_t original_position; |
a50699fd | 1849 | |
4b4deea2 | 1850 | BVAR (current_buffer, point_before_scroll) = Qnil; |
b6a0ebc3 | 1851 | |
6ba7f443 | 1852 | if (charpos == PT) |
a50699fd JA |
1853 | return; |
1854 | ||
ef1900f3 | 1855 | /* In a single-byte buffer, the two positions must be equal. */ |
6ba7f443 | 1856 | eassert (ZV != ZV_BYTE || charpos == bytepos); |
ef1900f3 | 1857 | |
62056764 JB |
1858 | /* Check this now, before checking if the buffer has any intervals. |
1859 | That way, we can catch conditions which break this sanity check | |
1860 | whether or not there are intervals in the buffer. */ | |
6ba7f443 | 1861 | eassert (charpos <= ZV && charpos >= BEGV); |
62056764 | 1862 | |
6ba7f443 SM |
1863 | have_overlays = (current_buffer->overlays_before |
1864 | || current_buffer->overlays_after); | |
580fae94 RS |
1865 | |
1866 | /* If we have no text properties and overlays, | |
1867 | then we can do it quickly. */ | |
6ba7f443 | 1868 | if (NULL_INTERVAL_P (BUF_INTERVALS (current_buffer)) && ! have_overlays) |
a50699fd | 1869 | { |
6ba7f443 | 1870 | temp_set_point_both (current_buffer, charpos, bytepos); |
a50699fd JA |
1871 | return; |
1872 | } | |
1873 | ||
ef1900f3 RS |
1874 | /* Set TO to the interval containing the char after CHARPOS, |
1875 | and TOPREV to the interval containing the char before CHARPOS. | |
323a7ad4 | 1876 | Either one may be null. They may be equal. */ |
6ba7f443 SM |
1877 | to = find_interval (BUF_INTERVALS (current_buffer), charpos); |
1878 | if (charpos == BEGV) | |
294efdbe | 1879 | toprev = 0; |
ef1900f3 | 1880 | else if (to && to->position == charpos) |
323a7ad4 | 1881 | toprev = previous_interval (to); |
323a7ad4 RS |
1882 | else |
1883 | toprev = to; | |
1884 | ||
6ba7f443 | 1885 | buffer_point = (PT == ZV ? ZV - 1 : PT); |
9c79dd1b | 1886 | |
323a7ad4 RS |
1887 | /* Set FROM to the interval containing the char after PT, |
1888 | and FROMPREV to the interval containing the char before PT. | |
1889 | Either one may be null. They may be equal. */ | |
7ce503fd | 1890 | /* We could cache this and save time. */ |
6ba7f443 SM |
1891 | from = find_interval (BUF_INTERVALS (current_buffer), buffer_point); |
1892 | if (buffer_point == BEGV) | |
294efdbe | 1893 | fromprev = 0; |
6ba7f443 | 1894 | else if (from && from->position == PT) |
323a7ad4 | 1895 | fromprev = previous_interval (from); |
6ba7f443 | 1896 | else if (buffer_point != PT) |
323a7ad4 RS |
1897 | fromprev = from, from = 0; |
1898 | else | |
1899 | fromprev = from; | |
a50699fd | 1900 | |
7ce503fd | 1901 | /* Moving within an interval. */ |
580fae94 RS |
1902 | if (to == from && toprev == fromprev && INTERVAL_VISIBLE_P (to) |
1903 | && ! have_overlays) | |
a50699fd | 1904 | { |
6ba7f443 | 1905 | temp_set_point_both (current_buffer, charpos, bytepos); |
a50699fd JA |
1906 | return; |
1907 | } | |
1908 | ||
ef1900f3 | 1909 | original_position = charpos; |
580fae94 | 1910 | |
5eabb4e7 RS |
1911 | /* If the new position is between two intangible characters |
1912 | with the same intangible property value, | |
1913 | move forward or backward until a change in that property. */ | |
580fae94 RS |
1914 | if (NILP (Vinhibit_point_motion_hooks) |
1915 | && ((! NULL_INTERVAL_P (to) && ! NULL_INTERVAL_P (toprev)) | |
b827a9e3 RS |
1916 | || have_overlays) |
1917 | /* Intangibility never stops us from positioning at the beginning | |
1918 | or end of the buffer, so don't bother checking in that case. */ | |
ef1900f3 | 1919 | && charpos != BEGV && charpos != ZV) |
a50699fd | 1920 | { |
580fae94 | 1921 | Lisp_Object pos; |
f0dcf801 | 1922 | Lisp_Object intangible_propval; |
580fae94 | 1923 | |
d5219de5 RS |
1924 | if (backwards) |
1925 | { | |
0270b877 | 1926 | /* If the preceding character is both intangible and invisible, |
f0dcf801 MB |
1927 | and the invisible property is `rear-sticky', perturb it so |
1928 | that the search starts one character earlier -- this ensures | |
1929 | that point can never move to the end of an invisible/ | |
1930 | intangible/rear-sticky region. */ | |
1931 | charpos = adjust_for_invis_intang (charpos, -1, -1, 1); | |
1d14d232 | 1932 | |
f0dcf801 | 1933 | XSETINT (pos, charpos); |
5eabb4e7 RS |
1934 | |
1935 | /* If following char is intangible, | |
1936 | skip back over all chars with matching intangible property. */ | |
1d14d232 RS |
1937 | |
1938 | intangible_propval = Fget_char_property (pos, Qintangible, Qnil); | |
1939 | ||
5eabb4e7 | 1940 | if (! NILP (intangible_propval)) |
1d14d232 | 1941 | { |
6ba7f443 | 1942 | while (XINT (pos) > BEGV |
1d14d232 RS |
1943 | && EQ (Fget_char_property (make_number (XINT (pos) - 1), |
1944 | Qintangible, Qnil), | |
1945 | intangible_propval)) | |
1946 | pos = Fprevious_char_property_change (pos, Qnil); | |
f0dcf801 MB |
1947 | |
1948 | /* Set CHARPOS from POS, and if the final intangible character | |
1949 | that we skipped over is also invisible, and the invisible | |
1950 | property is `front-sticky', perturb it to be one character | |
1951 | earlier -- this ensures that point can never move to the | |
1952 | beginning of an invisible/intangible/front-sticky region. */ | |
1953 | charpos = adjust_for_invis_intang (XINT (pos), 0, -1, 0); | |
1d14d232 | 1954 | } |
d5219de5 | 1955 | } |
0df8950e | 1956 | else |
d5219de5 | 1957 | { |
f0dcf801 MB |
1958 | /* If the following character is both intangible and invisible, |
1959 | and the invisible property is `front-sticky', perturb it so | |
1960 | that the search starts one character later -- this ensures | |
1961 | that point can never move to the beginning of an | |
1962 | invisible/intangible/front-sticky region. */ | |
1963 | charpos = adjust_for_invis_intang (charpos, 0, 1, 1); | |
1964 | ||
1965 | XSETINT (pos, charpos); | |
1966 | ||
1d14d232 RS |
1967 | /* If preceding char is intangible, |
1968 | skip forward over all chars with matching intangible property. */ | |
1969 | ||
ef1900f3 | 1970 | intangible_propval = Fget_char_property (make_number (charpos - 1), |
580fae94 | 1971 | Qintangible, Qnil); |
5eabb4e7 | 1972 | |
5eabb4e7 | 1973 | if (! NILP (intangible_propval)) |
1d14d232 | 1974 | { |
6ba7f443 | 1975 | while (XINT (pos) < ZV |
1d14d232 RS |
1976 | && EQ (Fget_char_property (pos, Qintangible, Qnil), |
1977 | intangible_propval)) | |
1978 | pos = Fnext_char_property_change (pos, Qnil); | |
580fae94 | 1979 | |
f0dcf801 MB |
1980 | /* Set CHARPOS from POS, and if the final intangible character |
1981 | that we skipped over is also invisible, and the invisible | |
1982 | property is `rear-sticky', perturb it to be one character | |
1983 | later -- this ensures that point can never move to the | |
1984 | end of an invisible/intangible/rear-sticky region. */ | |
1985 | charpos = adjust_for_invis_intang (XINT (pos), -1, 1, 0); | |
1d14d232 | 1986 | } |
d5219de5 | 1987 | } |
580fae94 | 1988 | |
6ba7f443 | 1989 | bytepos = buf_charpos_to_bytepos (current_buffer, charpos); |
580fae94 RS |
1990 | } |
1991 | ||
ef1900f3 | 1992 | if (charpos != original_position) |
580fae94 | 1993 | { |
ef1900f3 RS |
1994 | /* Set TO to the interval containing the char after CHARPOS, |
1995 | and TOPREV to the interval containing the char before CHARPOS. | |
580fae94 | 1996 | Either one may be null. They may be equal. */ |
6ba7f443 SM |
1997 | to = find_interval (BUF_INTERVALS (current_buffer), charpos); |
1998 | if (charpos == BEGV) | |
580fae94 | 1999 | toprev = 0; |
ef1900f3 | 2000 | else if (to && to->position == charpos) |
580fae94 RS |
2001 | toprev = previous_interval (to); |
2002 | else | |
2003 | toprev = to; | |
a50699fd | 2004 | } |
323a7ad4 | 2005 | |
5eabb4e7 RS |
2006 | /* Here TO is the interval after the stopping point |
2007 | and TOPREV is the interval before the stopping point. | |
2008 | One or the other may be null. */ | |
2009 | ||
6ba7f443 | 2010 | temp_set_point_both (current_buffer, charpos, bytepos); |
a50699fd | 2011 | |
e0f24100 | 2012 | /* We run point-left and point-entered hooks here, if the |
d7e3e52b | 2013 | two intervals are not equivalent. These hooks take |
323a7ad4 | 2014 | (old_point, new_point) as arguments. */ |
ddd931ff RS |
2015 | if (NILP (Vinhibit_point_motion_hooks) |
2016 | && (! intervals_equal (from, to) | |
2017 | || ! intervals_equal (fromprev, toprev))) | |
9c79dd1b | 2018 | { |
323a7ad4 RS |
2019 | Lisp_Object leave_after, leave_before, enter_after, enter_before; |
2020 | ||
2021 | if (fromprev) | |
4e8f005c | 2022 | leave_before = textget (fromprev->plist, Qpoint_left); |
323a7ad4 | 2023 | else |
4e8f005c CY |
2024 | leave_before = Qnil; |
2025 | ||
323a7ad4 | 2026 | if (from) |
4e8f005c | 2027 | leave_after = textget (from->plist, Qpoint_left); |
323a7ad4 | 2028 | else |
4e8f005c | 2029 | leave_after = Qnil; |
323a7ad4 RS |
2030 | |
2031 | if (toprev) | |
4e8f005c | 2032 | enter_before = textget (toprev->plist, Qpoint_entered); |
323a7ad4 | 2033 | else |
4e8f005c CY |
2034 | enter_before = Qnil; |
2035 | ||
323a7ad4 | 2036 | if (to) |
4e8f005c | 2037 | enter_after = textget (to->plist, Qpoint_entered); |
323a7ad4 | 2038 | else |
4e8f005c | 2039 | enter_after = Qnil; |
9c79dd1b | 2040 | |
323a7ad4 | 2041 | if (! EQ (leave_before, enter_before) && !NILP (leave_before)) |
4e8f005c CY |
2042 | call2 (leave_before, make_number (old_position), |
2043 | make_number (charpos)); | |
323a7ad4 | 2044 | if (! EQ (leave_after, enter_after) && !NILP (leave_after)) |
4e8f005c CY |
2045 | call2 (leave_after, make_number (old_position), |
2046 | make_number (charpos)); | |
9c79dd1b | 2047 | |
323a7ad4 | 2048 | if (! EQ (enter_before, leave_before) && !NILP (enter_before)) |
4e8f005c CY |
2049 | call2 (enter_before, make_number (old_position), |
2050 | make_number (charpos)); | |
323a7ad4 | 2051 | if (! EQ (enter_after, leave_after) && !NILP (enter_after)) |
4e8f005c CY |
2052 | call2 (enter_after, make_number (old_position), |
2053 | make_number (charpos)); | |
9c79dd1b | 2054 | } |
a50699fd | 2055 | } |
294efdbe | 2056 | \f |
a7fa233f RS |
2057 | /* Move point to POSITION, unless POSITION is inside an intangible |
2058 | segment that reaches all the way to point. */ | |
2059 | ||
2060 | void | |
d311d28c | 2061 | move_if_not_intangible (ptrdiff_t position) |
a7fa233f RS |
2062 | { |
2063 | Lisp_Object pos; | |
2064 | Lisp_Object intangible_propval; | |
2065 | ||
2066 | XSETINT (pos, position); | |
2067 | ||
2068 | if (! NILP (Vinhibit_point_motion_hooks)) | |
2069 | /* If intangible is inhibited, always move point to POSITION. */ | |
2070 | ; | |
2e34157c | 2071 | else if (PT < position && XINT (pos) < ZV) |
a7fa233f RS |
2072 | { |
2073 | /* We want to move forward, so check the text before POSITION. */ | |
2074 | ||
2075 | intangible_propval = Fget_char_property (pos, | |
2076 | Qintangible, Qnil); | |
2077 | ||
2078 | /* If following char is intangible, | |
2079 | skip back over all chars with matching intangible property. */ | |
2080 | if (! NILP (intangible_propval)) | |
2081 | while (XINT (pos) > BEGV | |
2082 | && EQ (Fget_char_property (make_number (XINT (pos) - 1), | |
2083 | Qintangible, Qnil), | |
2084 | intangible_propval)) | |
2085 | pos = Fprevious_char_property_change (pos, Qnil); | |
2086 | } | |
2e34157c | 2087 | else if (XINT (pos) > BEGV) |
a7fa233f RS |
2088 | { |
2089 | /* We want to move backward, so check the text after POSITION. */ | |
2090 | ||
2091 | intangible_propval = Fget_char_property (make_number (XINT (pos) - 1), | |
2092 | Qintangible, Qnil); | |
2093 | ||
2094 | /* If following char is intangible, | |
887f2a2d | 2095 | skip forward over all chars with matching intangible property. */ |
a7fa233f RS |
2096 | if (! NILP (intangible_propval)) |
2097 | while (XINT (pos) < ZV | |
2098 | && EQ (Fget_char_property (pos, Qintangible, Qnil), | |
2099 | intangible_propval)) | |
2100 | pos = Fnext_char_property_change (pos, Qnil); | |
2101 | ||
2102 | } | |
97d8f112 RS |
2103 | else if (position < BEGV) |
2104 | position = BEGV; | |
2105 | else if (position > ZV) | |
2106 | position = ZV; | |
a7fa233f | 2107 | |
7d0393cf | 2108 | /* If the whole stretch between PT and POSITION isn't intangible, |
a7fa233f RS |
2109 | try moving to POSITION (which means we actually move farther |
2110 | if POSITION is inside of intangible text). */ | |
2111 | ||
2112 | if (XINT (pos) != PT) | |
2113 | SET_PT (position); | |
2114 | } | |
2115 | \f | |
f56b42ac KH |
2116 | /* If text at position POS has property PROP, set *VAL to the property |
2117 | value, *START and *END to the beginning and end of a region that | |
2118 | has the same property, and return 1. Otherwise return 0. | |
2119 | ||
2120 | OBJECT is the string or buffer to look for the property in; | |
2121 | nil means the current buffer. */ | |
2122 | ||
2123 | int | |
d311d28c PE |
2124 | get_property_and_range (ptrdiff_t pos, Lisp_Object prop, Lisp_Object *val, |
2125 | ptrdiff_t *start, ptrdiff_t *end, Lisp_Object object) | |
f56b42ac KH |
2126 | { |
2127 | INTERVAL i, prev, next; | |
2128 | ||
2129 | if (NILP (object)) | |
2130 | i = find_interval (BUF_INTERVALS (current_buffer), pos); | |
2131 | else if (BUFFERP (object)) | |
2132 | i = find_interval (BUF_INTERVALS (XBUFFER (object)), pos); | |
2133 | else if (STRINGP (object)) | |
d5db4077 | 2134 | i = find_interval (STRING_INTERVALS (object), pos); |
f56b42ac KH |
2135 | else |
2136 | abort (); | |
2137 | ||
2138 | if (NULL_INTERVAL_P (i) || (i->position + LENGTH (i) <= pos)) | |
2139 | return 0; | |
2140 | *val = textget (i->plist, prop); | |
2141 | if (NILP (*val)) | |
2142 | return 0; | |
2143 | ||
2144 | next = i; /* remember it in advance */ | |
2145 | prev = previous_interval (i); | |
2146 | while (! NULL_INTERVAL_P (prev) | |
2147 | && EQ (*val, textget (prev->plist, prop))) | |
2148 | i = prev, prev = previous_interval (prev); | |
2149 | *start = i->position; | |
2150 | ||
2151 | next = next_interval (i); | |
7d0393cf | 2152 | while (! NULL_INTERVAL_P (next) |
f56b42ac KH |
2153 | && EQ (*val, textget (next->plist, prop))) |
2154 | i = next, next = next_interval (next); | |
2155 | *end = i->position + LENGTH (i); | |
2156 | ||
2157 | return 1; | |
2158 | } | |
2159 | \f | |
2b4b027f GM |
2160 | /* Return the proper local keymap TYPE for position POSITION in |
2161 | BUFFER; TYPE should be one of `keymap' or `local-map'. Use the map | |
2162 | specified by the PROP property, if any. Otherwise, if TYPE is | |
1b0440ed RS |
2163 | `local-map' use BUFFER's local map. |
2164 | ||
2165 | POSITION must be in the accessible part of BUFFER. */ | |
5cae0ec6 RS |
2166 | |
2167 | Lisp_Object | |
d311d28c | 2168 | get_local_map (register ptrdiff_t position, register struct buffer *buffer, |
e79123aa | 2169 | Lisp_Object type) |
5cae0ec6 | 2170 | { |
f94ecad1 | 2171 | Lisp_Object prop, lispy_position, lispy_buffer; |
d311d28c | 2172 | ptrdiff_t old_begv, old_zv, old_begv_byte, old_zv_byte; |
5cae0ec6 | 2173 | |
7ce503fd | 2174 | /* Perhaps we should just change `position' to the limit. */ |
1b0440ed | 2175 | if (position > BUF_ZV (buffer) || position < BUF_BEGV (buffer)) |
5cae0ec6 RS |
2176 | abort (); |
2177 | ||
0f7a5fda KH |
2178 | /* Ignore narrowing, so that a local map continues to be valid even if |
2179 | the visible region contains no characters and hence no properties. */ | |
2180 | old_begv = BUF_BEGV (buffer); | |
2181 | old_zv = BUF_ZV (buffer); | |
ef1900f3 RS |
2182 | old_begv_byte = BUF_BEGV_BYTE (buffer); |
2183 | old_zv_byte = BUF_ZV_BYTE (buffer); | |
cffc6f3b CY |
2184 | |
2185 | SET_BUF_BEGV_BOTH (buffer, BUF_BEG (buffer), BUF_BEG_BYTE (buffer)); | |
2186 | SET_BUF_ZV_BOTH (buffer, BUF_Z (buffer), BUF_Z_BYTE (buffer)); | |
0f7a5fda | 2187 | |
0f7a5fda KH |
2188 | XSETFASTINT (lispy_position, position); |
2189 | XSETBUFFER (lispy_buffer, buffer); | |
4867a283 SM |
2190 | /* First check if the CHAR has any property. This is because when |
2191 | we click with the mouse, the mouse pointer is really pointing | |
2192 | to the CHAR after POS. */ | |
2b4b027f | 2193 | prop = Fget_char_property (lispy_position, type, lispy_buffer); |
4867a283 SM |
2194 | /* If not, look at the POS's properties. This is necessary because when |
2195 | editing a field with a `local-map' property, we want insertion at the end | |
2196 | to obey the `local-map' property. */ | |
2197 | if (NILP (prop)) | |
2198 | prop = get_pos_property (lispy_position, type, lispy_buffer); | |
0f7a5fda | 2199 | |
cffc6f3b CY |
2200 | SET_BUF_BEGV_BOTH (buffer, old_begv, old_begv_byte); |
2201 | SET_BUF_ZV_BOTH (buffer, old_zv, old_zv_byte); | |
5cae0ec6 RS |
2202 | |
2203 | /* Use the local map only if it is valid. */ | |
02067692 SM |
2204 | prop = get_keymap (prop, 0, 0); |
2205 | if (CONSP (prop)) | |
5cae0ec6 RS |
2206 | return prop; |
2207 | ||
2b4b027f | 2208 | if (EQ (type, Qkeymap)) |
6a7dccef DL |
2209 | return Qnil; |
2210 | else | |
4b4deea2 | 2211 | return BVAR (buffer, keymap); |
5cae0ec6 RS |
2212 | } |
2213 | \f | |
9c79dd1b | 2214 | /* Produce an interval tree reflecting the intervals in |
944d4e4b KH |
2215 | TREE from START to START + LENGTH. |
2216 | The new interval tree has no parent and has a starting-position of 0. */ | |
a50699fd | 2217 | |
7b1d5b85 | 2218 | INTERVAL |
d311d28c | 2219 | copy_intervals (INTERVAL tree, ptrdiff_t start, ptrdiff_t length) |
a50699fd JA |
2220 | { |
2221 | register INTERVAL i, new, t; | |
d311d28c | 2222 | register ptrdiff_t got, prevlen; |
a50699fd JA |
2223 | |
2224 | if (NULL_INTERVAL_P (tree) || length <= 0) | |
2225 | return NULL_INTERVAL; | |
2226 | ||
2227 | i = find_interval (tree, start); | |
cce7fefc | 2228 | eassert (!NULL_INTERVAL_P (i) && LENGTH (i) > 0); |
a50699fd | 2229 | |
7ce503fd | 2230 | /* If there is only one interval and it's the default, return nil. */ |
a50699fd JA |
2231 | if ((start - i->position + 1 + length) < LENGTH (i) |
2232 | && DEFAULT_INTERVAL_P (i)) | |
2233 | return NULL_INTERVAL; | |
2234 | ||
2235 | new = make_interval (); | |
944d4e4b | 2236 | new->position = 0; |
a50699fd | 2237 | got = (LENGTH (i) - (start - i->position)); |
9c79dd1b | 2238 | new->total_length = length; |
727fec2d | 2239 | CHECK_TOTAL_LENGTH (new); |
a50699fd JA |
2240 | copy_properties (i, new); |
2241 | ||
2242 | t = new; | |
95e3e1ef | 2243 | prevlen = got; |
a50699fd JA |
2244 | while (got < length) |
2245 | { | |
2246 | i = next_interval (i); | |
2bc7a79b | 2247 | t = split_interval_right (t, prevlen); |
a50699fd | 2248 | copy_properties (i, t); |
95e3e1ef RS |
2249 | prevlen = LENGTH (i); |
2250 | got += prevlen; | |
a50699fd JA |
2251 | } |
2252 | ||
4314dea4 | 2253 | return balance_an_interval (new); |
a50699fd JA |
2254 | } |
2255 | ||
7ce503fd | 2256 | /* Give STRING the properties of BUFFER from POSITION to LENGTH. */ |
a50699fd | 2257 | |
09db192c | 2258 | void |
e79123aa | 2259 | copy_intervals_to_string (Lisp_Object string, struct buffer *buffer, |
d311d28c | 2260 | ptrdiff_t position, ptrdiff_t length) |
a50699fd | 2261 | { |
46d8a55b | 2262 | INTERVAL interval_copy = copy_intervals (BUF_INTERVALS (buffer), |
a50699fd JA |
2263 | position, length); |
2264 | if (NULL_INTERVAL_P (interval_copy)) | |
2265 | return; | |
2266 | ||
439d5cb4 | 2267 | SET_INTERVAL_OBJECT (interval_copy, string); |
b13738b6 | 2268 | STRING_SET_INTERVALS (string, interval_copy); |
a50699fd | 2269 | } |
d8638d30 | 2270 | \f |
944d4e4b | 2271 | /* Return 1 if strings S1 and S2 have identical properties; 0 otherwise. |
d8638d30 RS |
2272 | Assume they have identical characters. */ |
2273 | ||
2274 | int | |
971de7fb | 2275 | compare_string_intervals (Lisp_Object s1, Lisp_Object s2) |
d8638d30 RS |
2276 | { |
2277 | INTERVAL i1, i2; | |
d311d28c PE |
2278 | ptrdiff_t pos = 0; |
2279 | ptrdiff_t end = SCHARS (s1); | |
d8638d30 | 2280 | |
d5db4077 KR |
2281 | i1 = find_interval (STRING_INTERVALS (s1), 0); |
2282 | i2 = find_interval (STRING_INTERVALS (s2), 0); | |
d8638d30 RS |
2283 | |
2284 | while (pos < end) | |
2285 | { | |
2286 | /* Determine how far we can go before we reach the end of I1 or I2. */ | |
d311d28c PE |
2287 | ptrdiff_t len1 = (i1 != 0 ? INTERVAL_LAST_POS (i1) : end) - pos; |
2288 | ptrdiff_t len2 = (i2 != 0 ? INTERVAL_LAST_POS (i2) : end) - pos; | |
2289 | ptrdiff_t distance = min (len1, len2); | |
d8638d30 RS |
2290 | |
2291 | /* If we ever find a mismatch between the strings, | |
2292 | they differ. */ | |
2293 | if (! intervals_equal (i1, i2)) | |
2294 | return 0; | |
2295 | ||
2296 | /* Advance POS till the end of the shorter interval, | |
2297 | and advance one or both interval pointers for the new position. */ | |
2298 | pos += distance; | |
2299 | if (len1 == distance) | |
2300 | i1 = next_interval (i1); | |
2301 | if (len2 == distance) | |
2302 | i2 = next_interval (i2); | |
2303 | } | |
2304 | return 1; | |
2305 | } | |
37f26f3c | 2306 | \f |
37f26f3c RS |
2307 | /* Recursively adjust interval I in the current buffer |
2308 | for setting enable_multibyte_characters to MULTI_FLAG. | |
2309 | The range of interval I is START ... END in characters, | |
2310 | START_BYTE ... END_BYTE in bytes. */ | |
2311 | ||
2312 | static void | |
e79123aa | 2313 | set_intervals_multibyte_1 (INTERVAL i, int multi_flag, |
d311d28c PE |
2314 | ptrdiff_t start, ptrdiff_t start_byte, |
2315 | ptrdiff_t end, ptrdiff_t end_byte) | |
37f26f3c | 2316 | { |
37f26f3c RS |
2317 | /* Fix the length of this interval. */ |
2318 | if (multi_flag) | |
2319 | i->total_length = end - start; | |
2320 | else | |
2321 | i->total_length = end_byte - start_byte; | |
727fec2d RS |
2322 | CHECK_TOTAL_LENGTH (i); |
2323 | ||
2324 | if (TOTAL_LENGTH (i) == 0) | |
2325 | { | |
2326 | delete_interval (i); | |
2327 | return; | |
2328 | } | |
37f26f3c RS |
2329 | |
2330 | /* Recursively fix the length of the subintervals. */ | |
2331 | if (i->left) | |
2332 | { | |
d311d28c | 2333 | ptrdiff_t left_end, left_end_byte; |
37f26f3c RS |
2334 | |
2335 | if (multi_flag) | |
2336 | { | |
d311d28c | 2337 | ptrdiff_t temp; |
37f26f3c RS |
2338 | left_end_byte = start_byte + LEFT_TOTAL_LENGTH (i); |
2339 | left_end = BYTE_TO_CHAR (left_end_byte); | |
727fec2d RS |
2340 | |
2341 | temp = CHAR_TO_BYTE (left_end); | |
2342 | ||
2343 | /* If LEFT_END_BYTE is in the middle of a character, | |
f813361d | 2344 | adjust it and LEFT_END to a char boundary. */ |
727fec2d RS |
2345 | if (left_end_byte > temp) |
2346 | { | |
2347 | left_end_byte = temp; | |
2348 | } | |
2349 | if (left_end_byte < temp) | |
2350 | { | |
2351 | left_end--; | |
2352 | left_end_byte = CHAR_TO_BYTE (left_end); | |
2353 | } | |
37f26f3c RS |
2354 | } |
2355 | else | |
2356 | { | |
2357 | left_end = start + LEFT_TOTAL_LENGTH (i); | |
2358 | left_end_byte = CHAR_TO_BYTE (left_end); | |
2359 | } | |
2360 | ||
2361 | set_intervals_multibyte_1 (i->left, multi_flag, start, start_byte, | |
2362 | left_end, left_end_byte); | |
2363 | } | |
2364 | if (i->right) | |
2365 | { | |
d311d28c | 2366 | ptrdiff_t right_start_byte, right_start; |
37f26f3c RS |
2367 | |
2368 | if (multi_flag) | |
2369 | { | |
d311d28c | 2370 | ptrdiff_t temp; |
727fec2d | 2371 | |
37f26f3c RS |
2372 | right_start_byte = end_byte - RIGHT_TOTAL_LENGTH (i); |
2373 | right_start = BYTE_TO_CHAR (right_start_byte); | |
727fec2d RS |
2374 | |
2375 | /* If RIGHT_START_BYTE is in the middle of a character, | |
f813361d | 2376 | adjust it and RIGHT_START to a char boundary. */ |
727fec2d RS |
2377 | temp = CHAR_TO_BYTE (right_start); |
2378 | ||
2379 | if (right_start_byte < temp) | |
2380 | { | |
2381 | right_start_byte = temp; | |
2382 | } | |
2383 | if (right_start_byte > temp) | |
2384 | { | |
2385 | right_start++; | |
2386 | right_start_byte = CHAR_TO_BYTE (right_start); | |
2387 | } | |
37f26f3c RS |
2388 | } |
2389 | else | |
2390 | { | |
2391 | right_start = end - RIGHT_TOTAL_LENGTH (i); | |
2392 | right_start_byte = CHAR_TO_BYTE (right_start); | |
2393 | } | |
2394 | ||
2395 | set_intervals_multibyte_1 (i->right, multi_flag, | |
2396 | right_start, right_start_byte, | |
2397 | end, end_byte); | |
2398 | } | |
727fec2d RS |
2399 | |
2400 | /* Rounding to char boundaries can theoretically ake this interval | |
2401 | spurious. If so, delete one child, and copy its property list | |
2402 | to this interval. */ | |
2403 | if (LEFT_TOTAL_LENGTH (i) + RIGHT_TOTAL_LENGTH (i) >= TOTAL_LENGTH (i)) | |
2404 | { | |
2405 | if ((i)->left) | |
2406 | { | |
2407 | (i)->plist = (i)->left->plist; | |
2408 | (i)->left->total_length = 0; | |
2409 | delete_interval ((i)->left); | |
2410 | } | |
2411 | else | |
2412 | { | |
2413 | (i)->plist = (i)->right->plist; | |
2414 | (i)->right->total_length = 0; | |
2415 | delete_interval ((i)->right); | |
2416 | } | |
2417 | } | |
37f26f3c | 2418 | } |
d2f7a802 | 2419 | |
24cef261 RS |
2420 | /* Update the intervals of the current buffer |
2421 | to fit the contents as multibyte (if MULTI_FLAG is 1) | |
2422 | or to fit them as non-multibyte (if MULTI_FLAG is 0). */ | |
2423 | ||
2424 | void | |
971de7fb | 2425 | set_intervals_multibyte (int multi_flag) |
24cef261 RS |
2426 | { |
2427 | if (BUF_INTERVALS (current_buffer)) | |
2428 | set_intervals_multibyte_1 (BUF_INTERVALS (current_buffer), multi_flag, | |
2429 | BEG, BEG_BYTE, Z, Z_BYTE); | |
2430 | } |