Commit | Line | Data |
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a50699fd | 1 | /* Code for doing intervals. |
73b0cd50 | 2 | Copyright (C) 1993-1995, 1997-1998, 2001-2011 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> |
a50699fd JA |
42 | #include "lisp.h" |
43 | #include "intervals.h" | |
44 | #include "buffer.h" | |
328c0f1f | 45 | #include "puresize.h" |
f54a8c1a | 46 | #include "keyboard.h" |
8feddab4 | 47 | #include "keymap.h" |
a50699fd | 48 | |
45d82bdc KH |
49 | /* Test for membership, allowing for t (actually any non-cons) to mean the |
50 | universal set. */ | |
51 | ||
52 | #define TMEM(sym, set) (CONSP (set) ? ! NILP (Fmemq (sym, set)) : ! NILP (set)) | |
53 | ||
971de7fb | 54 | Lisp_Object merge_properties_sticky (Lisp_Object pleft, Lisp_Object pright); |
f57e2426 J |
55 | static INTERVAL reproduce_tree (INTERVAL, INTERVAL); |
56 | static INTERVAL reproduce_tree_obj (INTERVAL, Lisp_Object); | |
a50699fd | 57 | \f |
7ce503fd | 58 | /* Utility functions for intervals. */ |
a50699fd JA |
59 | |
60 | ||
7ce503fd | 61 | /* Create the root interval of some object, a buffer or string. */ |
a50699fd JA |
62 | |
63 | INTERVAL | |
971de7fb | 64 | create_root_interval (Lisp_Object parent) |
a50699fd | 65 | { |
328c0f1f RS |
66 | INTERVAL new; |
67 | ||
68 | CHECK_IMPURE (parent); | |
69 | ||
70 | new = make_interval (); | |
a50699fd | 71 | |
b629dd47 | 72 | if (BUFFERP (parent)) |
a50699fd | 73 | { |
2bc7a79b JB |
74 | new->total_length = (BUF_Z (XBUFFER (parent)) |
75 | - BUF_BEG (XBUFFER (parent))); | |
727fec2d | 76 | CHECK_TOTAL_LENGTH (new); |
e5d967c9 | 77 | BUF_INTERVALS (XBUFFER (parent)) = new; |
4867a283 | 78 | new->position = BEG; |
a50699fd | 79 | } |
b629dd47 | 80 | else if (STRINGP (parent)) |
a50699fd | 81 | { |
d5db4077 | 82 | new->total_length = SCHARS (parent); |
727fec2d | 83 | CHECK_TOTAL_LENGTH (new); |
b13738b6 | 84 | STRING_SET_INTERVALS (parent, new); |
944d4e4b | 85 | new->position = 0; |
a50699fd JA |
86 | } |
87 | ||
439d5cb4 | 88 | SET_INTERVAL_OBJECT (new, parent); |
a50699fd JA |
89 | |
90 | return new; | |
91 | } | |
92 | ||
93 | /* Make the interval TARGET have exactly the properties of SOURCE */ | |
94 | ||
95 | void | |
971de7fb | 96 | copy_properties (register INTERVAL source, register INTERVAL target) |
a50699fd JA |
97 | { |
98 | if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target)) | |
99 | return; | |
100 | ||
101 | COPY_INTERVAL_CACHE (source, target); | |
102 | target->plist = Fcopy_sequence (source->plist); | |
103 | } | |
104 | ||
105 | /* Merge the properties of interval SOURCE into the properties | |
323a7ad4 RS |
106 | of interval TARGET. That is to say, each property in SOURCE |
107 | is added to TARGET if TARGET has no such property as yet. */ | |
a50699fd JA |
108 | |
109 | static void | |
971de7fb | 110 | merge_properties (register INTERVAL source, register INTERVAL target) |
a50699fd JA |
111 | { |
112 | register Lisp_Object o, sym, val; | |
113 | ||
114 | if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target)) | |
115 | return; | |
116 | ||
117 | MERGE_INTERVAL_CACHE (source, target); | |
118 | ||
119 | o = source->plist; | |
4867a283 | 120 | while (CONSP (o)) |
a50699fd | 121 | { |
4867a283 | 122 | sym = XCAR (o); |
4028a938 KS |
123 | o = XCDR (o); |
124 | CHECK_CONS (o); | |
125 | ||
126 | val = target->plist; | |
127 | while (CONSP (val) && !EQ (XCAR (val), sym)) | |
128 | { | |
129 | val = XCDR (val); | |
130 | if (!CONSP (val)) | |
131 | break; | |
132 | val = XCDR (val); | |
133 | } | |
a50699fd JA |
134 | |
135 | if (NILP (val)) | |
136 | { | |
4867a283 | 137 | val = XCAR (o); |
a50699fd | 138 | target->plist = Fcons (sym, Fcons (val, target->plist)); |
a50699fd | 139 | } |
4028a938 | 140 | o = XCDR (o); |
a50699fd JA |
141 | } |
142 | } | |
143 | ||
144 | /* Return 1 if the two intervals have the same properties, | |
7ce503fd | 145 | 0 otherwise. */ |
a50699fd JA |
146 | |
147 | int | |
971de7fb | 148 | intervals_equal (INTERVAL i0, INTERVAL i1) |
a50699fd | 149 | { |
4028a938 KS |
150 | register Lisp_Object i0_cdr, i0_sym; |
151 | register Lisp_Object i1_cdr, i1_val; | |
a50699fd JA |
152 | |
153 | if (DEFAULT_INTERVAL_P (i0) && DEFAULT_INTERVAL_P (i1)) | |
154 | return 1; | |
155 | ||
323a7ad4 RS |
156 | if (DEFAULT_INTERVAL_P (i0) || DEFAULT_INTERVAL_P (i1)) |
157 | return 0; | |
158 | ||
a50699fd | 159 | i0_cdr = i0->plist; |
4028a938 KS |
160 | i1_cdr = i1->plist; |
161 | while (CONSP (i0_cdr) && CONSP (i1_cdr)) | |
a50699fd | 162 | { |
4867a283 | 163 | i0_sym = XCAR (i0_cdr); |
4028a938 KS |
164 | i0_cdr = XCDR (i0_cdr); |
165 | if (!CONSP (i0_cdr)) | |
166 | return 0; /* abort (); */ | |
167 | i1_val = i1->plist; | |
168 | while (CONSP (i1_val) && !EQ (XCAR (i1_val), i0_sym)) | |
169 | { | |
170 | i1_val = XCDR (i1_val); | |
171 | if (!CONSP (i1_val)) | |
172 | return 0; /* abort (); */ | |
173 | i1_val = XCDR (i1_val); | |
174 | } | |
a50699fd | 175 | |
7ce503fd | 176 | /* i0 has something i1 doesn't. */ |
a50699fd JA |
177 | if (EQ (i1_val, Qnil)) |
178 | return 0; | |
179 | ||
7ce503fd | 180 | /* i0 and i1 both have sym, but it has different values in each. */ |
4028a938 KS |
181 | if (!CONSP (i1_val) |
182 | || (i1_val = XCDR (i1_val), !CONSP (i1_val)) | |
183 | || !EQ (XCAR (i1_val), XCAR (i0_cdr))) | |
a50699fd JA |
184 | return 0; |
185 | ||
4867a283 | 186 | i0_cdr = XCDR (i0_cdr); |
a50699fd | 187 | |
4028a938 KS |
188 | i1_cdr = XCDR (i1_cdr); |
189 | if (!CONSP (i1_cdr)) | |
190 | return 0; /* abort (); */ | |
191 | i1_cdr = XCDR (i1_cdr); | |
192 | } | |
a50699fd | 193 | |
4028a938 KS |
194 | /* Lengths of the two plists were equal. */ |
195 | return (NILP (i0_cdr) && NILP (i1_cdr)); | |
a50699fd JA |
196 | } |
197 | \f | |
a50699fd | 198 | |
19d4e9a7 SM |
199 | /* Traverse an interval tree TREE, performing FUNCTION on each node. |
200 | No guarantee is made about the order of traversal. | |
201 | Pass FUNCTION two args: an interval, and ARG. */ | |
202 | ||
203 | void | |
971de7fb | 204 | traverse_intervals_noorder (INTERVAL tree, void (*function) (INTERVAL, Lisp_Object), Lisp_Object arg) |
19d4e9a7 SM |
205 | { |
206 | /* Minimize stack usage. */ | |
207 | while (!NULL_INTERVAL_P (tree)) | |
208 | { | |
209 | (*function) (tree, arg); | |
210 | if (NULL_INTERVAL_P (tree->right)) | |
211 | tree = tree->left; | |
212 | else | |
213 | { | |
214 | traverse_intervals_noorder (tree->left, function, arg); | |
215 | tree = tree->right; | |
216 | } | |
217 | } | |
218 | } | |
219 | ||
a50699fd | 220 | /* Traverse an interval tree TREE, performing FUNCTION on each node. |
4a93c905 | 221 | Pass FUNCTION two args: an interval, and ARG. */ |
a50699fd JA |
222 | |
223 | void | |
c50bd0d2 | 224 | traverse_intervals (INTERVAL tree, EMACS_INT position, |
e79123aa | 225 | void (*function) (INTERVAL, Lisp_Object), Lisp_Object arg) |
a50699fd | 226 | { |
19d4e9a7 SM |
227 | while (!NULL_INTERVAL_P (tree)) |
228 | { | |
42005513 | 229 | traverse_intervals (tree->left, position, function, arg); |
19d4e9a7 SM |
230 | position += LEFT_TOTAL_LENGTH (tree); |
231 | tree->position = position; | |
232 | (*function) (tree, arg); | |
42005513 | 233 | position += LENGTH (tree); tree = tree->right; |
19d4e9a7 | 234 | } |
a50699fd JA |
235 | } |
236 | \f | |
237 | #if 0 | |
e39adcda GM |
238 | |
239 | static int icount; | |
240 | static int idepth; | |
241 | static int zero_length; | |
242 | ||
7ce503fd | 243 | /* These functions are temporary, for debugging purposes only. */ |
a50699fd JA |
244 | |
245 | INTERVAL search_interval, found_interval; | |
246 | ||
247 | void | |
248 | check_for_interval (i) | |
249 | register INTERVAL i; | |
250 | { | |
251 | if (i == search_interval) | |
252 | { | |
253 | found_interval = i; | |
254 | icount++; | |
255 | } | |
256 | } | |
257 | ||
258 | INTERVAL | |
259 | search_for_interval (i, tree) | |
260 | register INTERVAL i, tree; | |
261 | { | |
262 | icount = 0; | |
263 | search_interval = i; | |
264 | found_interval = NULL_INTERVAL; | |
19d4e9a7 | 265 | traverse_intervals_noorder (tree, &check_for_interval, Qnil); |
a50699fd JA |
266 | return found_interval; |
267 | } | |
268 | ||
269 | static void | |
270 | inc_interval_count (i) | |
271 | INTERVAL i; | |
272 | { | |
273 | icount++; | |
274 | if (LENGTH (i) == 0) | |
275 | zero_length++; | |
276 | if (depth > idepth) | |
277 | idepth = depth; | |
278 | } | |
279 | ||
280 | int | |
281 | count_intervals (i) | |
282 | register INTERVAL i; | |
283 | { | |
284 | icount = 0; | |
285 | idepth = 0; | |
286 | zero_length = 0; | |
19d4e9a7 | 287 | traverse_intervals_noorder (i, &inc_interval_count, Qnil); |
a50699fd JA |
288 | |
289 | return icount; | |
290 | } | |
291 | ||
292 | static INTERVAL | |
293 | root_interval (interval) | |
294 | INTERVAL interval; | |
295 | { | |
296 | register INTERVAL i = interval; | |
297 | ||
298 | while (! ROOT_INTERVAL_P (i)) | |
439d5cb4 | 299 | i = INTERVAL_PARENT (i); |
a50699fd JA |
300 | |
301 | return i; | |
302 | } | |
303 | #endif | |
304 | \f | |
305 | /* Assuming that a left child exists, perform the following operation: | |
306 | ||
307 | A B | |
308 | / \ / \ | |
309 | B => A | |
310 | / \ / \ | |
311 | c c | |
312 | */ | |
313 | ||
19d4e9a7 | 314 | static INLINE INTERVAL |
971de7fb | 315 | rotate_right (INTERVAL interval) |
a50699fd JA |
316 | { |
317 | INTERVAL i; | |
318 | INTERVAL B = interval->left; | |
c50bd0d2 | 319 | EMACS_INT old_total = interval->total_length; |
a50699fd | 320 | |
7ce503fd | 321 | /* Deal with any Parent of A; make it point to B. */ |
a50699fd | 322 | if (! ROOT_INTERVAL_P (interval)) |
e39adcda GM |
323 | { |
324 | if (AM_LEFT_CHILD (interval)) | |
439d5cb4 | 325 | INTERVAL_PARENT (interval)->left = B; |
e39adcda | 326 | else |
439d5cb4 | 327 | INTERVAL_PARENT (interval)->right = B; |
e39adcda | 328 | } |
439d5cb4 | 329 | COPY_INTERVAL_PARENT (B, interval); |
a50699fd | 330 | |
4314dea4 RS |
331 | /* Make B the parent of A */ |
332 | i = B->right; | |
333 | B->right = interval; | |
439d5cb4 | 334 | SET_INTERVAL_PARENT (interval, B); |
a50699fd | 335 | |
4314dea4 | 336 | /* Make A point to c */ |
a50699fd JA |
337 | interval->left = i; |
338 | if (! NULL_INTERVAL_P (i)) | |
439d5cb4 | 339 | SET_INTERVAL_PARENT (i, interval); |
4314dea4 | 340 | |
550bd63a | 341 | /* A's total length is decreased by the length of B and its left child. */ |
4314dea4 | 342 | interval->total_length -= B->total_length - LEFT_TOTAL_LENGTH (interval); |
727fec2d | 343 | CHECK_TOTAL_LENGTH (interval); |
4314dea4 RS |
344 | |
345 | /* B must have the same total length of A. */ | |
346 | B->total_length = old_total; | |
727fec2d | 347 | CHECK_TOTAL_LENGTH (B); |
a50699fd JA |
348 | |
349 | return B; | |
350 | } | |
4314dea4 | 351 | |
a50699fd JA |
352 | /* Assuming that a right child exists, perform the following operation: |
353 | ||
7d0393cf JB |
354 | A B |
355 | / \ / \ | |
a50699fd | 356 | B => A |
7d0393cf | 357 | / \ / \ |
a50699fd JA |
358 | c c |
359 | */ | |
360 | ||
19d4e9a7 | 361 | static INLINE INTERVAL |
971de7fb | 362 | rotate_left (INTERVAL interval) |
a50699fd JA |
363 | { |
364 | INTERVAL i; | |
365 | INTERVAL B = interval->right; | |
c50bd0d2 | 366 | EMACS_INT old_total = interval->total_length; |
a50699fd | 367 | |
4314dea4 | 368 | /* Deal with any parent of A; make it point to B. */ |
a50699fd | 369 | if (! ROOT_INTERVAL_P (interval)) |
e39adcda GM |
370 | { |
371 | if (AM_LEFT_CHILD (interval)) | |
439d5cb4 | 372 | INTERVAL_PARENT (interval)->left = B; |
e39adcda | 373 | else |
439d5cb4 | 374 | INTERVAL_PARENT (interval)->right = B; |
e39adcda | 375 | } |
439d5cb4 | 376 | COPY_INTERVAL_PARENT (B, interval); |
a50699fd JA |
377 | |
378 | /* Make B the parent of A */ | |
4314dea4 RS |
379 | i = B->left; |
380 | B->left = interval; | |
439d5cb4 | 381 | SET_INTERVAL_PARENT (interval, B); |
a50699fd JA |
382 | |
383 | /* Make A point to c */ | |
384 | interval->right = i; | |
385 | if (! NULL_INTERVAL_P (i)) | |
439d5cb4 | 386 | SET_INTERVAL_PARENT (i, interval); |
4314dea4 | 387 | |
550bd63a | 388 | /* A's total length is decreased by the length of B and its right child. */ |
4314dea4 | 389 | interval->total_length -= B->total_length - RIGHT_TOTAL_LENGTH (interval); |
727fec2d | 390 | CHECK_TOTAL_LENGTH (interval); |
4314dea4 RS |
391 | |
392 | /* B must have the same total length of A. */ | |
393 | B->total_length = old_total; | |
727fec2d | 394 | CHECK_TOTAL_LENGTH (B); |
a50699fd JA |
395 | |
396 | return B; | |
397 | } | |
398 | \f | |
4314dea4 RS |
399 | /* Balance an interval tree with the assumption that the subtrees |
400 | themselves are already balanced. */ | |
401 | ||
402 | static INTERVAL | |
971de7fb | 403 | balance_an_interval (INTERVAL i) |
4314dea4 | 404 | { |
e79123aa | 405 | register EMACS_INT old_diff, new_diff; |
4314dea4 RS |
406 | |
407 | while (1) | |
408 | { | |
409 | old_diff = LEFT_TOTAL_LENGTH (i) - RIGHT_TOTAL_LENGTH (i); | |
410 | if (old_diff > 0) | |
411 | { | |
727fec2d | 412 | /* Since the left child is longer, there must be one. */ |
4314dea4 RS |
413 | new_diff = i->total_length - i->left->total_length |
414 | + RIGHT_TOTAL_LENGTH (i->left) - LEFT_TOTAL_LENGTH (i->left); | |
1ea40aa2 | 415 | if (eabs (new_diff) >= old_diff) |
4314dea4 RS |
416 | break; |
417 | i = rotate_right (i); | |
418 | balance_an_interval (i->right); | |
419 | } | |
420 | else if (old_diff < 0) | |
421 | { | |
727fec2d | 422 | /* Since the right child is longer, there must be one. */ |
4314dea4 RS |
423 | new_diff = i->total_length - i->right->total_length |
424 | + LEFT_TOTAL_LENGTH (i->right) - RIGHT_TOTAL_LENGTH (i->right); | |
1ea40aa2 | 425 | if (eabs (new_diff) >= -old_diff) |
4314dea4 RS |
426 | break; |
427 | i = rotate_left (i); | |
428 | balance_an_interval (i->left); | |
429 | } | |
430 | else | |
431 | break; | |
432 | } | |
433 | return i; | |
434 | } | |
435 | ||
436 | /* Balance INTERVAL, potentially stuffing it back into its parent | |
437 | Lisp Object. */ | |
438 | ||
439 | static INLINE INTERVAL | |
971de7fb | 440 | balance_possible_root_interval (register INTERVAL interval) |
4314dea4 RS |
441 | { |
442 | Lisp_Object parent; | |
439d5cb4 | 443 | int have_parent = 0; |
4314dea4 | 444 | |
439d5cb4 | 445 | if (!INTERVAL_HAS_OBJECT (interval) && !INTERVAL_HAS_PARENT (interval)) |
4314dea4 RS |
446 | return interval; |
447 | ||
439d5cb4 KR |
448 | if (INTERVAL_HAS_OBJECT (interval)) |
449 | { | |
450 | have_parent = 1; | |
451 | GET_INTERVAL_OBJECT (parent, interval); | |
452 | } | |
4314dea4 RS |
453 | interval = balance_an_interval (interval); |
454 | ||
439d5cb4 KR |
455 | if (have_parent) |
456 | { | |
457 | if (BUFFERP (parent)) | |
458 | BUF_INTERVALS (XBUFFER (parent)) = interval; | |
459 | else if (STRINGP (parent)) | |
b13738b6 | 460 | STRING_SET_INTERVALS (parent, interval); |
439d5cb4 | 461 | } |
4314dea4 RS |
462 | |
463 | return interval; | |
464 | } | |
465 | ||
466 | /* Balance the interval tree TREE. Balancing is by weight | |
467 | (the amount of text). */ | |
468 | ||
469 | static INTERVAL | |
971de7fb | 470 | balance_intervals_internal (register INTERVAL tree) |
4314dea4 RS |
471 | { |
472 | /* Balance within each side. */ | |
473 | if (tree->left) | |
8f3b9b95 | 474 | balance_intervals_internal (tree->left); |
4314dea4 | 475 | if (tree->right) |
8f3b9b95 | 476 | balance_intervals_internal (tree->right); |
4314dea4 RS |
477 | return balance_an_interval (tree); |
478 | } | |
479 | ||
480 | /* Advertised interface to balance intervals. */ | |
481 | ||
482 | INTERVAL | |
971de7fb | 483 | balance_intervals (INTERVAL tree) |
4314dea4 RS |
484 | { |
485 | if (tree == NULL_INTERVAL) | |
486 | return NULL_INTERVAL; | |
487 | ||
488 | return balance_intervals_internal (tree); | |
489 | } | |
490 | \f | |
2bc7a79b JB |
491 | /* Split INTERVAL into two pieces, starting the second piece at |
492 | character position OFFSET (counting from 0), relative to INTERVAL. | |
493 | INTERVAL becomes the left-hand piece, and the right-hand piece | |
494 | (second, lexicographically) is returned. | |
90ba40fc JA |
495 | |
496 | The size and position fields of the two intervals are set based upon | |
497 | those of the original interval. The property list of the new interval | |
498 | is reset, thus it is up to the caller to do the right thing with the | |
499 | result. | |
a50699fd JA |
500 | |
501 | Note that this does not change the position of INTERVAL; if it is a root, | |
7ce503fd | 502 | it is still a root after this operation. */ |
a50699fd JA |
503 | |
504 | INTERVAL | |
e79123aa | 505 | split_interval_right (INTERVAL interval, EMACS_INT offset) |
a50699fd JA |
506 | { |
507 | INTERVAL new = make_interval (); | |
c50bd0d2 CY |
508 | EMACS_INT position = interval->position; |
509 | EMACS_INT new_length = LENGTH (interval) - offset; | |
a50699fd | 510 | |
2bc7a79b | 511 | new->position = position + offset; |
439d5cb4 | 512 | SET_INTERVAL_PARENT (new, interval); |
a50699fd | 513 | |
4314dea4 | 514 | if (NULL_RIGHT_CHILD (interval)) |
a50699fd JA |
515 | { |
516 | interval->right = new; | |
517 | new->total_length = new_length; | |
727fec2d | 518 | CHECK_TOTAL_LENGTH (new); |
a50699fd | 519 | } |
cc6e2aaa RS |
520 | else |
521 | { | |
522 | /* Insert the new node between INTERVAL and its right child. */ | |
523 | new->right = interval->right; | |
439d5cb4 | 524 | SET_INTERVAL_PARENT (interval->right, new); |
cc6e2aaa RS |
525 | interval->right = new; |
526 | new->total_length = new_length + new->right->total_length; | |
727fec2d | 527 | CHECK_TOTAL_LENGTH (new); |
cc6e2aaa RS |
528 | balance_an_interval (new); |
529 | } | |
7d0393cf | 530 | |
4314dea4 RS |
531 | balance_possible_root_interval (interval); |
532 | ||
a50699fd JA |
533 | return new; |
534 | } | |
535 | ||
2bc7a79b JB |
536 | /* Split INTERVAL into two pieces, starting the second piece at |
537 | character position OFFSET (counting from 0), relative to INTERVAL. | |
538 | INTERVAL becomes the right-hand piece, and the left-hand piece | |
539 | (first, lexicographically) is returned. | |
a50699fd | 540 | |
90ba40fc JA |
541 | The size and position fields of the two intervals are set based upon |
542 | those of the original interval. The property list of the new interval | |
543 | is reset, thus it is up to the caller to do the right thing with the | |
544 | result. | |
545 | ||
546 | Note that this does not change the position of INTERVAL; if it is a root, | |
7ce503fd | 547 | it is still a root after this operation. */ |
a50699fd JA |
548 | |
549 | INTERVAL | |
e79123aa | 550 | split_interval_left (INTERVAL interval, EMACS_INT offset) |
a50699fd JA |
551 | { |
552 | INTERVAL new = make_interval (); | |
e79123aa | 553 | EMACS_INT new_length = offset; |
a50699fd | 554 | |
a50699fd | 555 | new->position = interval->position; |
2bc7a79b | 556 | interval->position = interval->position + offset; |
439d5cb4 | 557 | SET_INTERVAL_PARENT (new, interval); |
a50699fd JA |
558 | |
559 | if (NULL_LEFT_CHILD (interval)) | |
560 | { | |
561 | interval->left = new; | |
562 | new->total_length = new_length; | |
727fec2d | 563 | CHECK_TOTAL_LENGTH (new); |
a50699fd | 564 | } |
cc6e2aaa RS |
565 | else |
566 | { | |
567 | /* Insert the new node between INTERVAL and its left child. */ | |
568 | new->left = interval->left; | |
439d5cb4 | 569 | SET_INTERVAL_PARENT (new->left, new); |
cc6e2aaa RS |
570 | interval->left = new; |
571 | new->total_length = new_length + new->left->total_length; | |
727fec2d | 572 | CHECK_TOTAL_LENGTH (new); |
cc6e2aaa RS |
573 | balance_an_interval (new); |
574 | } | |
7d0393cf | 575 | |
4314dea4 | 576 | balance_possible_root_interval (interval); |
a50699fd JA |
577 | |
578 | return new; | |
579 | } | |
580 | \f | |
944d4e4b KH |
581 | /* Return the proper position for the first character |
582 | described by the interval tree SOURCE. | |
583 | This is 1 if the parent is a buffer, | |
584 | 0 if the parent is a string or if there is no parent. | |
585 | ||
586 | Don't use this function on an interval which is the child | |
587 | of another interval! */ | |
588 | ||
589 | int | |
971de7fb | 590 | interval_start_pos (INTERVAL source) |
944d4e4b KH |
591 | { |
592 | Lisp_Object parent; | |
593 | ||
594 | if (NULL_INTERVAL_P (source)) | |
595 | return 0; | |
596 | ||
e0b8c689 KR |
597 | if (! INTERVAL_HAS_OBJECT (source)) |
598 | return 0; | |
439d5cb4 | 599 | GET_INTERVAL_OBJECT (parent, source); |
944d4e4b KH |
600 | if (BUFFERP (parent)) |
601 | return BUF_BEG (XBUFFER (parent)); | |
602 | return 0; | |
603 | } | |
604 | ||
90ba40fc | 605 | /* Find the interval containing text position POSITION in the text |
24e3d3bf | 606 | represented by the interval tree TREE. POSITION is a buffer |
944d4e4b KH |
607 | position (starting from 1) or a string index (starting from 0). |
608 | If POSITION is at the end of the buffer or string, | |
609 | return the interval containing the last character. | |
a50699fd | 610 | |
90ba40fc JA |
611 | The `position' field, which is a cache of an interval's position, |
612 | is updated in the interval found. Other functions (e.g., next_interval) | |
7ce503fd | 613 | will update this cache based on the result of find_interval. */ |
90ba40fc | 614 | |
1863bbf8 | 615 | INTERVAL |
e79123aa | 616 | find_interval (register INTERVAL tree, register EMACS_INT position) |
a50699fd | 617 | { |
24e3d3bf JB |
618 | /* The distance from the left edge of the subtree at TREE |
619 | to POSITION. */ | |
c50bd0d2 | 620 | register EMACS_INT relative_position; |
a50699fd JA |
621 | |
622 | if (NULL_INTERVAL_P (tree)) | |
623 | return NULL_INTERVAL; | |
624 | ||
944d4e4b | 625 | relative_position = position; |
439d5cb4 KR |
626 | if (INTERVAL_HAS_OBJECT (tree)) |
627 | { | |
628 | Lisp_Object parent; | |
629 | GET_INTERVAL_OBJECT (parent, tree); | |
630 | if (BUFFERP (parent)) | |
631 | relative_position -= BUF_BEG (XBUFFER (parent)); | |
632 | } | |
944d4e4b | 633 | |
24e3d3bf | 634 | if (relative_position > TOTAL_LENGTH (tree)) |
a50699fd | 635 | abort (); /* Paranoia */ |
a50699fd | 636 | |
52283633 SM |
637 | if (!handling_signal) |
638 | tree = balance_possible_root_interval (tree); | |
4314dea4 | 639 | |
a50699fd JA |
640 | while (1) |
641 | { | |
24e3d3bf | 642 | if (relative_position < LEFT_TOTAL_LENGTH (tree)) |
a50699fd JA |
643 | { |
644 | tree = tree->left; | |
645 | } | |
24e3d3bf JB |
646 | else if (! NULL_RIGHT_CHILD (tree) |
647 | && relative_position >= (TOTAL_LENGTH (tree) | |
648 | - RIGHT_TOTAL_LENGTH (tree))) | |
a50699fd JA |
649 | { |
650 | relative_position -= (TOTAL_LENGTH (tree) | |
651 | - RIGHT_TOTAL_LENGTH (tree)); | |
652 | tree = tree->right; | |
653 | } | |
654 | else | |
655 | { | |
944d4e4b | 656 | tree->position |
4867a283 SM |
657 | = (position - relative_position /* left edge of *tree. */ |
658 | + LEFT_TOTAL_LENGTH (tree)); /* left edge of this interval. */ | |
24e3d3bf | 659 | |
a50699fd JA |
660 | return tree; |
661 | } | |
662 | } | |
663 | } | |
664 | \f | |
665 | /* Find the succeeding interval (lexicographically) to INTERVAL. | |
90ba40fc | 666 | Sets the `position' field based on that of INTERVAL (see |
7ce503fd | 667 | find_interval). */ |
a50699fd JA |
668 | |
669 | INTERVAL | |
971de7fb | 670 | next_interval (register INTERVAL interval) |
a50699fd JA |
671 | { |
672 | register INTERVAL i = interval; | |
c50bd0d2 | 673 | register EMACS_INT next_position; |
a50699fd JA |
674 | |
675 | if (NULL_INTERVAL_P (i)) | |
676 | return NULL_INTERVAL; | |
677 | next_position = interval->position + LENGTH (interval); | |
678 | ||
679 | if (! NULL_RIGHT_CHILD (i)) | |
680 | { | |
681 | i = i->right; | |
682 | while (! NULL_LEFT_CHILD (i)) | |
683 | i = i->left; | |
684 | ||
685 | i->position = next_position; | |
686 | return i; | |
687 | } | |
688 | ||
689 | while (! NULL_PARENT (i)) | |
690 | { | |
691 | if (AM_LEFT_CHILD (i)) | |
692 | { | |
439d5cb4 | 693 | i = INTERVAL_PARENT (i); |
a50699fd JA |
694 | i->position = next_position; |
695 | return i; | |
696 | } | |
697 | ||
439d5cb4 | 698 | i = INTERVAL_PARENT (i); |
a50699fd JA |
699 | } |
700 | ||
701 | return NULL_INTERVAL; | |
702 | } | |
703 | ||
704 | /* Find the preceding interval (lexicographically) to INTERVAL. | |
90ba40fc | 705 | Sets the `position' field based on that of INTERVAL (see |
7ce503fd | 706 | find_interval). */ |
a50699fd JA |
707 | |
708 | INTERVAL | |
971de7fb | 709 | previous_interval (register INTERVAL interval) |
a50699fd JA |
710 | { |
711 | register INTERVAL i; | |
a50699fd JA |
712 | |
713 | if (NULL_INTERVAL_P (interval)) | |
714 | return NULL_INTERVAL; | |
715 | ||
716 | if (! NULL_LEFT_CHILD (interval)) | |
717 | { | |
718 | i = interval->left; | |
719 | while (! NULL_RIGHT_CHILD (i)) | |
720 | i = i->right; | |
721 | ||
722 | i->position = interval->position - LENGTH (i); | |
723 | return i; | |
724 | } | |
725 | ||
726 | i = interval; | |
727 | while (! NULL_PARENT (i)) | |
728 | { | |
729 | if (AM_RIGHT_CHILD (i)) | |
730 | { | |
439d5cb4 | 731 | i = INTERVAL_PARENT (i); |
a50699fd JA |
732 | |
733 | i->position = interval->position - LENGTH (i); | |
734 | return i; | |
735 | } | |
439d5cb4 | 736 | i = INTERVAL_PARENT (i); |
a50699fd JA |
737 | } |
738 | ||
739 | return NULL_INTERVAL; | |
740 | } | |
25eeac41 RS |
741 | |
742 | /* Find the interval containing POS given some non-NULL INTERVAL | |
75167cd4 | 743 | in the same tree. Note that we need to update interval->position |
52283633 SM |
744 | if we go down the tree. |
745 | To speed up the process, we assume that the ->position of | |
746 | I and all its parents is already uptodate. */ | |
25eeac41 | 747 | INTERVAL |
e79123aa | 748 | update_interval (register INTERVAL i, EMACS_INT pos) |
25eeac41 RS |
749 | { |
750 | if (NULL_INTERVAL_P (i)) | |
751 | return NULL_INTERVAL; | |
752 | ||
7d0393cf | 753 | while (1) |
25eeac41 | 754 | { |
7d0393cf | 755 | if (pos < i->position) |
25eeac41 RS |
756 | { |
757 | /* Move left. */ | |
7d0393cf | 758 | if (pos >= i->position - TOTAL_LENGTH (i->left)) |
75167cd4 RS |
759 | { |
760 | i->left->position = i->position - TOTAL_LENGTH (i->left) | |
761 | + LEFT_TOTAL_LENGTH (i->left); | |
762 | i = i->left; /* Move to the left child */ | |
763 | } | |
7d0393cf | 764 | else if (NULL_PARENT (i)) |
25eeac41 | 765 | error ("Point before start of properties"); |
7d0393cf | 766 | else |
439d5cb4 | 767 | i = INTERVAL_PARENT (i); |
25eeac41 RS |
768 | continue; |
769 | } | |
770 | else if (pos >= INTERVAL_LAST_POS (i)) | |
771 | { | |
772 | /* Move right. */ | |
7d0393cf | 773 | if (pos < INTERVAL_LAST_POS (i) + TOTAL_LENGTH (i->right)) |
75167cd4 | 774 | { |
70cc95c4 SM |
775 | i->right->position = INTERVAL_LAST_POS (i) |
776 | + LEFT_TOTAL_LENGTH (i->right); | |
75167cd4 RS |
777 | i = i->right; /* Move to the right child */ |
778 | } | |
7d0393cf | 779 | else if (NULL_PARENT (i)) |
70cc95c4 | 780 | error ("Point %d after end of properties", pos); |
7d0393cf | 781 | else |
70cc95c4 | 782 | i = INTERVAL_PARENT (i); |
25eeac41 RS |
783 | continue; |
784 | } | |
7d0393cf | 785 | else |
25eeac41 RS |
786 | return i; |
787 | } | |
788 | } | |
789 | ||
a50699fd | 790 | \f |
90ba40fc | 791 | #if 0 |
a50699fd JA |
792 | /* Traverse a path down the interval tree TREE to the interval |
793 | containing POSITION, adjusting all nodes on the path for | |
794 | an addition of LENGTH characters. Insertion between two intervals | |
795 | (i.e., point == i->position, where i is second interval) means | |
796 | text goes into second interval. | |
797 | ||
798 | Modifications are needed to handle the hungry bits -- after simply | |
799 | finding the interval at position (don't add length going down), | |
800 | if it's the beginning of the interval, get the previous interval | |
8e6208c5 | 801 | and check the hungry bits of both. Then add the length going back up |
7ce503fd | 802 | to the root. */ |
a50699fd JA |
803 | |
804 | static INTERVAL | |
805 | adjust_intervals_for_insertion (tree, position, length) | |
806 | INTERVAL tree; | |
807 | int position, length; | |
808 | { | |
809 | register int relative_position; | |
810 | register INTERVAL this; | |
811 | ||
812 | if (TOTAL_LENGTH (tree) == 0) /* Paranoia */ | |
813 | abort (); | |
814 | ||
815 | /* If inserting at point-max of a buffer, that position | |
816 | will be out of range */ | |
817 | if (position > TOTAL_LENGTH (tree)) | |
818 | position = TOTAL_LENGTH (tree); | |
819 | relative_position = position; | |
820 | this = tree; | |
821 | ||
822 | while (1) | |
823 | { | |
824 | if (relative_position <= LEFT_TOTAL_LENGTH (this)) | |
825 | { | |
826 | this->total_length += length; | |
727fec2d | 827 | CHECK_TOTAL_LENGTH (this); |
a50699fd JA |
828 | this = this->left; |
829 | } | |
830 | else if (relative_position > (TOTAL_LENGTH (this) | |
831 | - RIGHT_TOTAL_LENGTH (this))) | |
832 | { | |
833 | relative_position -= (TOTAL_LENGTH (this) | |
834 | - RIGHT_TOTAL_LENGTH (this)); | |
835 | this->total_length += length; | |
727fec2d | 836 | CHECK_TOTAL_LENGTH (this); |
a50699fd JA |
837 | this = this->right; |
838 | } | |
839 | else | |
840 | { | |
841 | /* If we are to use zero-length intervals as buffer pointers, | |
7ce503fd | 842 | then this code will have to change. */ |
a50699fd | 843 | this->total_length += length; |
727fec2d | 844 | CHECK_TOTAL_LENGTH (this); |
a50699fd JA |
845 | this->position = LEFT_TOTAL_LENGTH (this) |
846 | + position - relative_position + 1; | |
847 | return tree; | |
848 | } | |
849 | } | |
850 | } | |
90ba40fc JA |
851 | #endif |
852 | ||
853 | /* Effect an adjustment corresponding to the addition of LENGTH characters | |
854 | of text. Do this by finding the interval containing POSITION in the | |
550bd63a | 855 | interval tree TREE, and then adjusting all of its ancestors by adding |
90ba40fc JA |
856 | LENGTH to them. |
857 | ||
858 | If POSITION is the first character of an interval, meaning that point | |
859 | is actually between the two intervals, make the new text belong to | |
860 | the interval which is "sticky". | |
861 | ||
1d1d7ba0 | 862 | If both intervals are "sticky", then make them belong to the left-most |
90ba40fc | 863 | interval. Another possibility would be to create a new interval for |
7ce503fd | 864 | this text, and make it have the merged properties of both ends. */ |
90ba40fc JA |
865 | |
866 | static INTERVAL | |
e79123aa EZ |
867 | adjust_intervals_for_insertion (INTERVAL tree, |
868 | EMACS_INT position, EMACS_INT length) | |
90ba40fc JA |
869 | { |
870 | register INTERVAL i; | |
7ce503fd RS |
871 | register INTERVAL temp; |
872 | int eobp = 0; | |
944d4e4b | 873 | Lisp_Object parent; |
e79123aa | 874 | EMACS_INT offset; |
7d0393cf | 875 | |
90ba40fc JA |
876 | if (TOTAL_LENGTH (tree) == 0) /* Paranoia */ |
877 | abort (); | |
878 | ||
439d5cb4 | 879 | GET_INTERVAL_OBJECT (parent, tree); |
944d4e4b KH |
880 | offset = (BUFFERP (parent) ? BUF_BEG (XBUFFER (parent)) : 0); |
881 | ||
24e3d3bf JB |
882 | /* If inserting at point-max of a buffer, that position will be out |
883 | of range. Remember that buffer positions are 1-based. */ | |
944d4e4b KH |
884 | if (position >= TOTAL_LENGTH (tree) + offset) |
885 | { | |
886 | position = TOTAL_LENGTH (tree) + offset; | |
887 | eobp = 1; | |
888 | } | |
90ba40fc JA |
889 | |
890 | i = find_interval (tree, position); | |
7ce503fd | 891 | |
2313b945 RS |
892 | /* If in middle of an interval which is not sticky either way, |
893 | we must not just give its properties to the insertion. | |
f56b42ac KH |
894 | So split this interval at the insertion point. |
895 | ||
896 | Originally, the if condition here was this: | |
897 | (! (position == i->position || eobp) | |
898 | && END_NONSTICKY_P (i) | |
899 | && FRONT_NONSTICKY_P (i)) | |
900 | But, these macros are now unreliable because of introduction of | |
901 | Vtext_property_default_nonsticky. So, we always check properties | |
902 | one by one if POSITION is in middle of an interval. */ | |
903 | if (! (position == i->position || eobp)) | |
2313b945 | 904 | { |
ca41a64d RS |
905 | Lisp_Object tail; |
906 | Lisp_Object front, rear; | |
907 | ||
f56b42ac KH |
908 | tail = i->plist; |
909 | ||
910 | /* Properties font-sticky and rear-nonsticky override | |
911 | Vtext_property_default_nonsticky. So, if they are t, we can | |
912 | skip one by one checking of properties. */ | |
913 | rear = textget (i->plist, Qrear_nonsticky); | |
914 | if (! CONSP (rear) && ! NILP (rear)) | |
915 | { | |
916 | /* All properties are nonsticky. We split the interval. */ | |
917 | goto check_done; | |
918 | } | |
ca41a64d | 919 | front = textget (i->plist, Qfront_sticky); |
f56b42ac KH |
920 | if (! CONSP (front) && ! NILP (front)) |
921 | { | |
922 | /* All properties are sticky. We don't split the interval. */ | |
923 | tail = Qnil; | |
924 | goto check_done; | |
925 | } | |
ca41a64d | 926 | |
f56b42ac KH |
927 | /* Does any actual property pose an actual problem? We break |
928 | the loop if we find a nonsticky property. */ | |
929 | for (; CONSP (tail); tail = Fcdr (XCDR (tail))) | |
ca41a64d | 930 | { |
f56b42ac | 931 | Lisp_Object prop, tmp; |
03699b14 | 932 | prop = XCAR (tail); |
ca41a64d | 933 | |
f56b42ac | 934 | /* Is this particular property front-sticky? */ |
ca41a64d RS |
935 | if (CONSP (front) && ! NILP (Fmemq (prop, front))) |
936 | continue; | |
937 | ||
f56b42ac KH |
938 | /* Is this particular property rear-nonsticky? */ |
939 | if (CONSP (rear) && ! NILP (Fmemq (prop, rear))) | |
940 | break; | |
941 | ||
942 | /* Is this particular property recorded as sticky or | |
943 | nonsticky in Vtext_property_default_nonsticky? */ | |
944 | tmp = Fassq (prop, Vtext_property_default_nonsticky); | |
945 | if (CONSP (tmp)) | |
946 | { | |
947 | if (NILP (tmp)) | |
948 | continue; | |
949 | break; | |
950 | } | |
951 | ||
952 | /* By default, a text property is rear-sticky, thus we | |
953 | continue the loop. */ | |
ca41a64d RS |
954 | } |
955 | ||
f56b42ac | 956 | check_done: |
ca41a64d RS |
957 | /* If any property is a real problem, split the interval. */ |
958 | if (! NILP (tail)) | |
959 | { | |
960 | temp = split_interval_right (i, position - i->position); | |
961 | copy_properties (i, temp); | |
962 | i = temp; | |
963 | } | |
2313b945 RS |
964 | } |
965 | ||
90ba40fc | 966 | /* If we are positioned between intervals, check the stickiness of |
7ce503fd RS |
967 | both of them. We have to do this too, if we are at BEG or Z. */ |
968 | if (position == i->position || eobp) | |
90ba40fc | 969 | { |
7ce503fd RS |
970 | register INTERVAL prev; |
971 | ||
972 | if (position == BEG) | |
973 | prev = 0; | |
974 | else if (eobp) | |
975 | { | |
976 | prev = i; | |
977 | i = 0; | |
978 | } | |
979 | else | |
980 | prev = previous_interval (i); | |
90ba40fc | 981 | |
7ce503fd RS |
982 | /* Even if we are positioned between intervals, we default |
983 | to the left one if it exists. We extend it now and split | |
8e6208c5 | 984 | off a part later, if stickiness demands it. */ |
439d5cb4 | 985 | for (temp = prev ? prev : i; temp; temp = INTERVAL_PARENT_OR_NULL (temp)) |
4314dea4 RS |
986 | { |
987 | temp->total_length += length; | |
727fec2d | 988 | CHECK_TOTAL_LENGTH (temp); |
4314dea4 RS |
989 | temp = balance_possible_root_interval (temp); |
990 | } | |
7d0393cf | 991 | |
7ce503fd | 992 | /* If at least one interval has sticky properties, |
f56b42ac KH |
993 | we check the stickiness property by property. |
994 | ||
995 | Originally, the if condition here was this: | |
996 | (END_NONSTICKY_P (prev) || FRONT_STICKY_P (i)) | |
997 | But, these macros are now unreliable because of introduction | |
998 | of Vtext_property_default_nonsticky. So, we always have to | |
999 | check stickiness of properties one by one. If cache of | |
1000 | stickiness is implemented in the future, we may be able to | |
1001 | use those macros again. */ | |
1002 | if (1) | |
7ce503fd | 1003 | { |
dd675b05 | 1004 | Lisp_Object pleft, pright; |
7ce503fd RS |
1005 | struct interval newi; |
1006 | ||
dd675b05 KH |
1007 | pleft = NULL_INTERVAL_P (prev) ? Qnil : prev->plist; |
1008 | pright = NULL_INTERVAL_P (i) ? Qnil : i->plist; | |
7ce503fd RS |
1009 | newi.plist = merge_properties_sticky (pleft, pright); |
1010 | ||
ef1900f3 | 1011 | if (! prev) /* i.e. position == BEG */ |
7ce503fd RS |
1012 | { |
1013 | if (! intervals_equal (i, &newi)) | |
1014 | { | |
1015 | i = split_interval_left (i, length); | |
1016 | i->plist = newi.plist; | |
1017 | } | |
1018 | } | |
1019 | else if (! intervals_equal (prev, &newi)) | |
1020 | { | |
1021 | prev = split_interval_right (prev, | |
1022 | position - prev->position); | |
1023 | prev->plist = newi.plist; | |
1024 | if (! NULL_INTERVAL_P (i) | |
1025 | && intervals_equal (prev, i)) | |
1026 | merge_interval_right (prev); | |
1027 | } | |
1028 | ||
1029 | /* We will need to update the cache here later. */ | |
1030 | } | |
1031 | else if (! prev && ! NILP (i->plist)) | |
1032 | { | |
1033 | /* Just split off a new interval at the left. | |
1034 | Since I wasn't front-sticky, the empty plist is ok. */ | |
1035 | i = split_interval_left (i, length); | |
1036 | } | |
90ba40fc JA |
1037 | } |
1038 | ||
7ce503fd RS |
1039 | /* Otherwise just extend the interval. */ |
1040 | else | |
90ba40fc | 1041 | { |
439d5cb4 | 1042 | for (temp = i; temp; temp = INTERVAL_PARENT_OR_NULL (temp)) |
4314dea4 RS |
1043 | { |
1044 | temp->total_length += length; | |
727fec2d | 1045 | CHECK_TOTAL_LENGTH (temp); |
4314dea4 RS |
1046 | temp = balance_possible_root_interval (temp); |
1047 | } | |
90ba40fc | 1048 | } |
7d0393cf | 1049 | |
90ba40fc JA |
1050 | return tree; |
1051 | } | |
7ce503fd | 1052 | |
45d82bdc KH |
1053 | /* Any property might be front-sticky on the left, rear-sticky on the left, |
1054 | front-sticky on the right, or rear-sticky on the right; the 16 combinations | |
1055 | can be arranged in a matrix with rows denoting the left conditions and | |
1056 | columns denoting the right conditions: | |
1057 | _ __ _ | |
1058 | _ FR FR FR FR | |
1059 | FR__ 0 1 2 3 | |
1060 | _FR 4 5 6 7 | |
1061 | FR 8 9 A B | |
1062 | FR C D E F | |
1063 | ||
1064 | left-props = '(front-sticky (p8 p9 pa pb pc pd pe pf) | |
1065 | rear-nonsticky (p4 p5 p6 p7 p8 p9 pa pb) | |
1066 | p0 L p1 L p2 L p3 L p4 L p5 L p6 L p7 L | |
1067 | p8 L p9 L pa L pb L pc L pd L pe L pf L) | |
1068 | right-props = '(front-sticky (p2 p3 p6 p7 pa pb pe pf) | |
1069 | rear-nonsticky (p1 p2 p5 p6 p9 pa pd pe) | |
1070 | p0 R p1 R p2 R p3 R p4 R p5 R p6 R p7 R | |
1071 | p8 R p9 R pa R pb R pc R pd R pe R pf R) | |
1072 | ||
1073 | We inherit from whoever has a sticky side facing us. If both sides | |
1074 | do (cases 2, 3, E, and F), then we inherit from whichever side has a | |
1075 | non-nil value for the current property. If both sides do, then we take | |
1076 | from the left. | |
1077 | ||
1078 | When we inherit a property, we get its stickiness as well as its value. | |
1079 | So, when we merge the above two lists, we expect to get this: | |
1080 | ||
1081 | result = '(front-sticky (p6 p7 pa pb pc pd pe pf) | |
1082 | rear-nonsticky (p6 pa) | |
1083 | p0 L p1 L p2 L p3 L p6 R p7 R | |
1084 | pa R pb R pc L pd L pe L pf L) | |
1085 | ||
1086 | The optimizable special cases are: | |
1087 | left rear-nonsticky = nil, right front-sticky = nil (inherit left) | |
1088 | left rear-nonsticky = t, right front-sticky = t (inherit right) | |
1089 | left rear-nonsticky = t, right front-sticky = nil (inherit none) | |
1090 | */ | |
1091 | ||
7ce503fd | 1092 | Lisp_Object |
971de7fb | 1093 | merge_properties_sticky (Lisp_Object pleft, Lisp_Object pright) |
7ce503fd | 1094 | { |
dd675b05 KH |
1095 | register Lisp_Object props, front, rear; |
1096 | Lisp_Object lfront, lrear, rfront, rrear; | |
4ab19eb3 | 1097 | register Lisp_Object tail1, tail2, sym, lval, rval, cat; |
45d82bdc | 1098 | int use_left, use_right; |
4ab19eb3 | 1099 | int lpresent; |
7ce503fd | 1100 | |
dd675b05 KH |
1101 | props = Qnil; |
1102 | front = Qnil; | |
1103 | rear = Qnil; | |
1104 | lfront = textget (pleft, Qfront_sticky); | |
1105 | lrear = textget (pleft, Qrear_nonsticky); | |
1106 | rfront = textget (pright, Qfront_sticky); | |
1107 | rrear = textget (pright, Qrear_nonsticky); | |
1108 | ||
45d82bdc | 1109 | /* Go through each element of PRIGHT. */ |
4867a283 | 1110 | for (tail1 = pright; CONSP (tail1); tail1 = Fcdr (XCDR (tail1))) |
7ce503fd | 1111 | { |
f56b42ac KH |
1112 | Lisp_Object tmp; |
1113 | ||
4867a283 | 1114 | sym = XCAR (tail1); |
7ce503fd RS |
1115 | |
1116 | /* Sticky properties get special treatment. */ | |
1117 | if (EQ (sym, Qrear_nonsticky) || EQ (sym, Qfront_sticky)) | |
1118 | continue; | |
45d82bdc | 1119 | |
4867a283 SM |
1120 | rval = Fcar (XCDR (tail1)); |
1121 | for (tail2 = pleft; CONSP (tail2); tail2 = Fcdr (XCDR (tail2))) | |
1122 | if (EQ (sym, XCAR (tail2))) | |
45d82bdc | 1123 | break; |
45d82bdc | 1124 | |
4ab19eb3 RS |
1125 | /* Indicate whether the property is explicitly defined on the left. |
1126 | (We know it is defined explicitly on the right | |
1127 | because otherwise we don't get here.) */ | |
1128 | lpresent = ! NILP (tail2); | |
1129 | lval = (NILP (tail2) ? Qnil : Fcar (Fcdr (tail2))); | |
1130 | ||
f56b42ac KH |
1131 | /* Even if lrear or rfront say nothing about the stickiness of |
1132 | SYM, Vtext_property_default_nonsticky may give default | |
1133 | stickiness to SYM. */ | |
1134 | tmp = Fassq (sym, Vtext_property_default_nonsticky); | |
1135 | use_left = (lpresent | |
1136 | && ! (TMEM (sym, lrear) | |
3a62677f | 1137 | || (CONSP (tmp) && ! NILP (XCDR (tmp))))); |
f56b42ac KH |
1138 | use_right = (TMEM (sym, rfront) |
1139 | || (CONSP (tmp) && NILP (XCDR (tmp)))); | |
45d82bdc KH |
1140 | if (use_left && use_right) |
1141 | { | |
4ab19eb3 RS |
1142 | if (NILP (lval)) |
1143 | use_left = 0; | |
1144 | else if (NILP (rval)) | |
1145 | use_right = 0; | |
45d82bdc KH |
1146 | } |
1147 | if (use_left) | |
7ce503fd | 1148 | { |
45d82bdc KH |
1149 | /* We build props as (value sym ...) rather than (sym value ...) |
1150 | because we plan to nreverse it when we're done. */ | |
4ab19eb3 | 1151 | props = Fcons (lval, Fcons (sym, props)); |
45d82bdc | 1152 | if (TMEM (sym, lfront)) |
7ce503fd | 1153 | front = Fcons (sym, front); |
45d82bdc KH |
1154 | if (TMEM (sym, lrear)) |
1155 | rear = Fcons (sym, rear); | |
7ce503fd | 1156 | } |
45d82bdc | 1157 | else if (use_right) |
7ce503fd | 1158 | { |
4ab19eb3 | 1159 | props = Fcons (rval, Fcons (sym, props)); |
45d82bdc KH |
1160 | if (TMEM (sym, rfront)) |
1161 | front = Fcons (sym, front); | |
1162 | if (TMEM (sym, rrear)) | |
1163 | rear = Fcons (sym, rear); | |
7ce503fd RS |
1164 | } |
1165 | } | |
45d82bdc KH |
1166 | |
1167 | /* Now go through each element of PLEFT. */ | |
4867a283 | 1168 | for (tail2 = pleft; CONSP (tail2); tail2 = Fcdr (XCDR (tail2))) |
7ce503fd | 1169 | { |
f56b42ac KH |
1170 | Lisp_Object tmp; |
1171 | ||
4867a283 | 1172 | sym = XCAR (tail2); |
7ce503fd RS |
1173 | |
1174 | /* Sticky properties get special treatment. */ | |
1175 | if (EQ (sym, Qrear_nonsticky) || EQ (sym, Qfront_sticky)) | |
1176 | continue; | |
1177 | ||
45d82bdc | 1178 | /* If sym is in PRIGHT, we've already considered it. */ |
4867a283 SM |
1179 | for (tail1 = pright; CONSP (tail1); tail1 = Fcdr (XCDR (tail1))) |
1180 | if (EQ (sym, XCAR (tail1))) | |
7ce503fd | 1181 | break; |
45d82bdc KH |
1182 | if (! NILP (tail1)) |
1183 | continue; | |
1184 | ||
4867a283 | 1185 | lval = Fcar (XCDR (tail2)); |
45d82bdc | 1186 | |
f56b42ac KH |
1187 | /* Even if lrear or rfront say nothing about the stickiness of |
1188 | SYM, Vtext_property_default_nonsticky may give default | |
1189 | stickiness to SYM. */ | |
1190 | tmp = Fassq (sym, Vtext_property_default_nonsticky); | |
1191 | ||
45d82bdc | 1192 | /* Since rval is known to be nil in this loop, the test simplifies. */ |
f56b42ac | 1193 | if (! (TMEM (sym, lrear) || (CONSP (tmp) && ! NILP (XCDR (tmp))))) |
7ce503fd | 1194 | { |
4ab19eb3 | 1195 | props = Fcons (lval, Fcons (sym, props)); |
45d82bdc KH |
1196 | if (TMEM (sym, lfront)) |
1197 | front = Fcons (sym, front); | |
1198 | } | |
f56b42ac | 1199 | else if (TMEM (sym, rfront) || (CONSP (tmp) && NILP (XCDR (tmp)))) |
45d82bdc KH |
1200 | { |
1201 | /* The value is nil, but we still inherit the stickiness | |
1202 | from the right. */ | |
7ce503fd | 1203 | front = Fcons (sym, front); |
45d82bdc | 1204 | if (TMEM (sym, rrear)) |
7ce503fd RS |
1205 | rear = Fcons (sym, rear); |
1206 | } | |
1207 | } | |
550bd63a | 1208 | props = Fnreverse (props); |
7ce503fd | 1209 | if (! NILP (rear)) |
550bd63a | 1210 | props = Fcons (Qrear_nonsticky, Fcons (Fnreverse (rear), props)); |
4ab19eb3 RS |
1211 | |
1212 | cat = textget (props, Qcategory); | |
1213 | if (! NILP (front) | |
7d0393cf | 1214 | && |
4ab19eb3 RS |
1215 | /* If we have inherited a front-stick category property that is t, |
1216 | we don't need to set up a detailed one. */ | |
1217 | ! (! NILP (cat) && SYMBOLP (cat) | |
1218 | && EQ (Fget (cat, Qfront_sticky), Qt))) | |
45d82bdc | 1219 | props = Fcons (Qfront_sticky, Fcons (Fnreverse (front), props)); |
7ce503fd | 1220 | return props; |
7ce503fd RS |
1221 | } |
1222 | ||
a50699fd | 1223 | \f |
7d0393cf | 1224 | /* Delete a node I from its interval tree by merging its subtrees |
90ba40fc | 1225 | into one subtree which is then returned. Caller is responsible for |
7ce503fd | 1226 | storing the resulting subtree into its parent. */ |
a50699fd JA |
1227 | |
1228 | static INTERVAL | |
971de7fb | 1229 | delete_node (register INTERVAL i) |
a50699fd JA |
1230 | { |
1231 | register INTERVAL migrate, this; | |
c50bd0d2 | 1232 | register EMACS_INT migrate_amt; |
a50699fd JA |
1233 | |
1234 | if (NULL_INTERVAL_P (i->left)) | |
1235 | return i->right; | |
1236 | if (NULL_INTERVAL_P (i->right)) | |
1237 | return i->left; | |
1238 | ||
1239 | migrate = i->left; | |
1240 | migrate_amt = i->left->total_length; | |
1241 | this = i->right; | |
1242 | this->total_length += migrate_amt; | |
1243 | while (! NULL_INTERVAL_P (this->left)) | |
1244 | { | |
1245 | this = this->left; | |
1246 | this->total_length += migrate_amt; | |
1247 | } | |
727fec2d | 1248 | CHECK_TOTAL_LENGTH (this); |
a50699fd | 1249 | this->left = migrate; |
439d5cb4 | 1250 | SET_INTERVAL_PARENT (migrate, this); |
a50699fd JA |
1251 | |
1252 | return i->right; | |
1253 | } | |
1254 | ||
1255 | /* Delete interval I from its tree by calling `delete_node' | |
1256 | and properly connecting the resultant subtree. | |
1257 | ||
1258 | I is presumed to be empty; that is, no adjustments are made | |
7ce503fd | 1259 | for the length of I. */ |
a50699fd JA |
1260 | |
1261 | void | |
971de7fb | 1262 | delete_interval (register INTERVAL i) |
a50699fd JA |
1263 | { |
1264 | register INTERVAL parent; | |
c50bd0d2 | 1265 | EMACS_INT amt = LENGTH (i); |
a50699fd | 1266 | |
7ce503fd | 1267 | if (amt > 0) /* Only used on zero-length intervals now. */ |
a50699fd JA |
1268 | abort (); |
1269 | ||
1270 | if (ROOT_INTERVAL_P (i)) | |
1271 | { | |
dd675b05 | 1272 | Lisp_Object owner; |
439d5cb4 | 1273 | GET_INTERVAL_OBJECT (owner, i); |
a50699fd JA |
1274 | parent = delete_node (i); |
1275 | if (! NULL_INTERVAL_P (parent)) | |
439d5cb4 | 1276 | SET_INTERVAL_OBJECT (parent, owner); |
a50699fd | 1277 | |
b629dd47 | 1278 | if (BUFFERP (owner)) |
e5d967c9 | 1279 | BUF_INTERVALS (XBUFFER (owner)) = parent; |
b629dd47 | 1280 | else if (STRINGP (owner)) |
b13738b6 | 1281 | STRING_SET_INTERVALS (owner, parent); |
a50699fd JA |
1282 | else |
1283 | abort (); | |
1284 | ||
1285 | return; | |
1286 | } | |
1287 | ||
439d5cb4 | 1288 | parent = INTERVAL_PARENT (i); |
a50699fd JA |
1289 | if (AM_LEFT_CHILD (i)) |
1290 | { | |
1291 | parent->left = delete_node (i); | |
1292 | if (! NULL_INTERVAL_P (parent->left)) | |
439d5cb4 | 1293 | SET_INTERVAL_PARENT (parent->left, parent); |
a50699fd JA |
1294 | } |
1295 | else | |
1296 | { | |
1297 | parent->right = delete_node (i); | |
1298 | if (! NULL_INTERVAL_P (parent->right)) | |
439d5cb4 | 1299 | SET_INTERVAL_PARENT (parent->right, parent); |
a50699fd JA |
1300 | } |
1301 | } | |
1302 | \f | |
24e3d3bf JB |
1303 | /* Find the interval in TREE corresponding to the relative position |
1304 | FROM and delete as much as possible of AMOUNT from that interval. | |
1305 | Return the amount actually deleted, and if the interval was | |
1306 | zeroed-out, delete that interval node from the tree. | |
1307 | ||
1308 | Note that FROM is actually origin zero, aka relative to the | |
1309 | leftmost edge of tree. This is appropriate since we call ourselves | |
1310 | recursively on subtrees. | |
a50699fd | 1311 | |
1d1d7ba0 | 1312 | Do this by recursing down TREE to the interval in question, and |
7ce503fd | 1313 | deleting the appropriate amount of text. */ |
a50699fd | 1314 | |
c50bd0d2 CY |
1315 | static EMACS_INT |
1316 | interval_deletion_adjustment (register INTERVAL tree, register EMACS_INT from, | |
1317 | register EMACS_INT amount) | |
a50699fd | 1318 | { |
c50bd0d2 | 1319 | register EMACS_INT relative_position = from; |
a50699fd JA |
1320 | |
1321 | if (NULL_INTERVAL_P (tree)) | |
1322 | return 0; | |
1323 | ||
1324 | /* Left branch */ | |
24e3d3bf | 1325 | if (relative_position < LEFT_TOTAL_LENGTH (tree)) |
a50699fd | 1326 | { |
c50bd0d2 | 1327 | EMACS_INT subtract = interval_deletion_adjustment (tree->left, |
6e48267a EZ |
1328 | relative_position, |
1329 | amount); | |
a50699fd | 1330 | tree->total_length -= subtract; |
727fec2d | 1331 | CHECK_TOTAL_LENGTH (tree); |
a50699fd JA |
1332 | return subtract; |
1333 | } | |
1334 | /* Right branch */ | |
24e3d3bf JB |
1335 | else if (relative_position >= (TOTAL_LENGTH (tree) |
1336 | - RIGHT_TOTAL_LENGTH (tree))) | |
a50699fd | 1337 | { |
c50bd0d2 | 1338 | EMACS_INT subtract; |
a50699fd JA |
1339 | |
1340 | relative_position -= (tree->total_length | |
1341 | - RIGHT_TOTAL_LENGTH (tree)); | |
1342 | subtract = interval_deletion_adjustment (tree->right, | |
1343 | relative_position, | |
1344 | amount); | |
1345 | tree->total_length -= subtract; | |
727fec2d | 1346 | CHECK_TOTAL_LENGTH (tree); |
a50699fd JA |
1347 | return subtract; |
1348 | } | |
7ce503fd | 1349 | /* Here -- this node. */ |
a50699fd JA |
1350 | else |
1351 | { | |
24e3d3bf | 1352 | /* How much can we delete from this interval? */ |
c50bd0d2 | 1353 | EMACS_INT my_amount = ((tree->total_length |
e79123aa EZ |
1354 | - RIGHT_TOTAL_LENGTH (tree)) |
1355 | - relative_position); | |
24e3d3bf JB |
1356 | |
1357 | if (amount > my_amount) | |
1358 | amount = my_amount; | |
1359 | ||
1360 | tree->total_length -= amount; | |
727fec2d | 1361 | CHECK_TOTAL_LENGTH (tree); |
24e3d3bf JB |
1362 | if (LENGTH (tree) == 0) |
1363 | delete_interval (tree); | |
7d0393cf | 1364 | |
24e3d3bf | 1365 | return amount; |
a50699fd JA |
1366 | } |
1367 | ||
7ce503fd | 1368 | /* Never reach here. */ |
a50699fd JA |
1369 | } |
1370 | ||
24e3d3bf JB |
1371 | /* Effect the adjustments necessary to the interval tree of BUFFER to |
1372 | correspond to the deletion of LENGTH characters from that buffer | |
1373 | text. The deletion is effected at position START (which is a | |
7ce503fd | 1374 | buffer position, i.e. origin 1). */ |
1d1d7ba0 | 1375 | |
a50699fd | 1376 | static void |
e79123aa EZ |
1377 | adjust_intervals_for_deletion (struct buffer *buffer, |
1378 | EMACS_INT start, EMACS_INT length) | |
a50699fd | 1379 | { |
e79123aa | 1380 | register EMACS_INT left_to_delete = length; |
e5d967c9 | 1381 | register INTERVAL tree = BUF_INTERVALS (buffer); |
944d4e4b | 1382 | Lisp_Object parent; |
c50bd0d2 | 1383 | EMACS_INT offset; |
944d4e4b | 1384 | |
439d5cb4 | 1385 | GET_INTERVAL_OBJECT (parent, tree); |
944d4e4b | 1386 | offset = (BUFFERP (parent) ? BUF_BEG (XBUFFER (parent)) : 0); |
a50699fd JA |
1387 | |
1388 | if (NULL_INTERVAL_P (tree)) | |
1389 | return; | |
1390 | ||
944d4e4b KH |
1391 | if (start > offset + TOTAL_LENGTH (tree) |
1392 | || start + length > offset + TOTAL_LENGTH (tree)) | |
24e3d3bf JB |
1393 | abort (); |
1394 | ||
a50699fd JA |
1395 | if (length == TOTAL_LENGTH (tree)) |
1396 | { | |
e5d967c9 | 1397 | BUF_INTERVALS (buffer) = NULL_INTERVAL; |
a50699fd JA |
1398 | return; |
1399 | } | |
1400 | ||
1401 | if (ONLY_INTERVAL_P (tree)) | |
1402 | { | |
1403 | tree->total_length -= length; | |
727fec2d | 1404 | CHECK_TOTAL_LENGTH (tree); |
a50699fd JA |
1405 | return; |
1406 | } | |
1407 | ||
944d4e4b KH |
1408 | if (start > offset + TOTAL_LENGTH (tree)) |
1409 | start = offset + TOTAL_LENGTH (tree); | |
a50699fd JA |
1410 | while (left_to_delete > 0) |
1411 | { | |
944d4e4b | 1412 | left_to_delete -= interval_deletion_adjustment (tree, start - offset, |
a50699fd | 1413 | left_to_delete); |
e5d967c9 | 1414 | tree = BUF_INTERVALS (buffer); |
a50699fd JA |
1415 | if (left_to_delete == tree->total_length) |
1416 | { | |
e5d967c9 | 1417 | BUF_INTERVALS (buffer) = NULL_INTERVAL; |
a50699fd JA |
1418 | return; |
1419 | } | |
1420 | } | |
1421 | } | |
1422 | \f | |
eb8c3be9 | 1423 | /* Make the adjustments necessary to the interval tree of BUFFER to |
1d1d7ba0 JA |
1424 | represent an addition or deletion of LENGTH characters starting |
1425 | at position START. Addition or deletion is indicated by the sign | |
7ce503fd | 1426 | of LENGTH. */ |
a50699fd JA |
1427 | |
1428 | INLINE void | |
e79123aa | 1429 | offset_intervals (struct buffer *buffer, EMACS_INT start, EMACS_INT length) |
a50699fd | 1430 | { |
e5d967c9 | 1431 | if (NULL_INTERVAL_P (BUF_INTERVALS (buffer)) || length == 0) |
a50699fd JA |
1432 | return; |
1433 | ||
1434 | if (length > 0) | |
e5d967c9 | 1435 | adjust_intervals_for_insertion (BUF_INTERVALS (buffer), start, length); |
a50699fd JA |
1436 | else |
1437 | adjust_intervals_for_deletion (buffer, start, -length); | |
1438 | } | |
9c79dd1b JA |
1439 | \f |
1440 | /* Merge interval I with its lexicographic successor. The resulting | |
1441 | interval is returned, and has the properties of the original | |
1442 | successor. The properties of I are lost. I is removed from the | |
1443 | interval tree. | |
1444 | ||
1445 | IMPORTANT: | |
1446 | The caller must verify that this is not the last (rightmost) | |
7ce503fd | 1447 | interval. */ |
9c79dd1b JA |
1448 | |
1449 | INTERVAL | |
971de7fb | 1450 | merge_interval_right (register INTERVAL i) |
9c79dd1b | 1451 | { |
c50bd0d2 | 1452 | register EMACS_INT absorb = LENGTH (i); |
9c79dd1b JA |
1453 | register INTERVAL successor; |
1454 | ||
7ce503fd | 1455 | /* Zero out this interval. */ |
9c79dd1b | 1456 | i->total_length -= absorb; |
727fec2d | 1457 | CHECK_TOTAL_LENGTH (i); |
9c79dd1b | 1458 | |
7ce503fd | 1459 | /* Find the succeeding interval. */ |
9c79dd1b | 1460 | if (! NULL_RIGHT_CHILD (i)) /* It's below us. Add absorb |
7ce503fd | 1461 | as we descend. */ |
9c79dd1b JA |
1462 | { |
1463 | successor = i->right; | |
1464 | while (! NULL_LEFT_CHILD (successor)) | |
1465 | { | |
1466 | successor->total_length += absorb; | |
727fec2d | 1467 | CHECK_TOTAL_LENGTH (successor); |
9c79dd1b JA |
1468 | successor = successor->left; |
1469 | } | |
1470 | ||
1471 | successor->total_length += absorb; | |
727fec2d | 1472 | CHECK_TOTAL_LENGTH (successor); |
9c79dd1b JA |
1473 | delete_interval (i); |
1474 | return successor; | |
1475 | } | |
1476 | ||
1477 | successor = i; | |
1478 | while (! NULL_PARENT (successor)) /* It's above us. Subtract as | |
7ce503fd | 1479 | we ascend. */ |
9c79dd1b JA |
1480 | { |
1481 | if (AM_LEFT_CHILD (successor)) | |
1482 | { | |
439d5cb4 | 1483 | successor = INTERVAL_PARENT (successor); |
9c79dd1b JA |
1484 | delete_interval (i); |
1485 | return successor; | |
1486 | } | |
1487 | ||
439d5cb4 | 1488 | successor = INTERVAL_PARENT (successor); |
9c79dd1b | 1489 | successor->total_length -= absorb; |
727fec2d | 1490 | CHECK_TOTAL_LENGTH (successor); |
9c79dd1b JA |
1491 | } |
1492 | ||
1493 | /* This must be the rightmost or last interval and cannot | |
7ce503fd | 1494 | be merged right. The caller should have known. */ |
9c79dd1b JA |
1495 | abort (); |
1496 | } | |
1497 | \f | |
1498 | /* Merge interval I with its lexicographic predecessor. The resulting | |
1499 | interval is returned, and has the properties of the original predecessor. | |
1500 | The properties of I are lost. Interval node I is removed from the tree. | |
1501 | ||
1502 | IMPORTANT: | |
7ce503fd | 1503 | The caller must verify that this is not the first (leftmost) interval. */ |
9c79dd1b JA |
1504 | |
1505 | INTERVAL | |
971de7fb | 1506 | merge_interval_left (register INTERVAL i) |
9c79dd1b | 1507 | { |
c50bd0d2 | 1508 | register EMACS_INT absorb = LENGTH (i); |
9c79dd1b JA |
1509 | register INTERVAL predecessor; |
1510 | ||
7ce503fd | 1511 | /* Zero out this interval. */ |
9c79dd1b | 1512 | i->total_length -= absorb; |
727fec2d | 1513 | CHECK_TOTAL_LENGTH (i); |
9c79dd1b | 1514 | |
7ce503fd | 1515 | /* Find the preceding interval. */ |
9c79dd1b | 1516 | if (! NULL_LEFT_CHILD (i)) /* It's below us. Go down, |
7ce503fd | 1517 | adding ABSORB as we go. */ |
9c79dd1b JA |
1518 | { |
1519 | predecessor = i->left; | |
1520 | while (! NULL_RIGHT_CHILD (predecessor)) | |
1521 | { | |
1522 | predecessor->total_length += absorb; | |
727fec2d | 1523 | CHECK_TOTAL_LENGTH (predecessor); |
9c79dd1b JA |
1524 | predecessor = predecessor->right; |
1525 | } | |
1526 | ||
1527 | predecessor->total_length += absorb; | |
727fec2d | 1528 | CHECK_TOTAL_LENGTH (predecessor); |
9c79dd1b JA |
1529 | delete_interval (i); |
1530 | return predecessor; | |
1531 | } | |
1532 | ||
1533 | predecessor = i; | |
1534 | while (! NULL_PARENT (predecessor)) /* It's above us. Go up, | |
7ce503fd | 1535 | subtracting ABSORB. */ |
9c79dd1b JA |
1536 | { |
1537 | if (AM_RIGHT_CHILD (predecessor)) | |
1538 | { | |
439d5cb4 | 1539 | predecessor = INTERVAL_PARENT (predecessor); |
9c79dd1b JA |
1540 | delete_interval (i); |
1541 | return predecessor; | |
1542 | } | |
1543 | ||
439d5cb4 | 1544 | predecessor = INTERVAL_PARENT (predecessor); |
9c79dd1b | 1545 | predecessor->total_length -= absorb; |
727fec2d | 1546 | CHECK_TOTAL_LENGTH (predecessor); |
9c79dd1b | 1547 | } |
a50699fd | 1548 | |
9c79dd1b | 1549 | /* This must be the leftmost or first interval and cannot |
7ce503fd | 1550 | be merged left. The caller should have known. */ |
9c79dd1b JA |
1551 | abort (); |
1552 | } | |
1553 | \f | |
1d1d7ba0 JA |
1554 | /* Make an exact copy of interval tree SOURCE which descends from |
1555 | PARENT. This is done by recursing through SOURCE, copying | |
1556 | the current interval and its properties, and then adjusting | |
7ce503fd | 1557 | the pointers of the copy. */ |
1d1d7ba0 | 1558 | |
a50699fd | 1559 | static INTERVAL |
971de7fb | 1560 | reproduce_tree (INTERVAL source, INTERVAL parent) |
a50699fd JA |
1561 | { |
1562 | register INTERVAL t = make_interval (); | |
1563 | ||
72af86bd | 1564 | memcpy (t, source, INTERVAL_SIZE); |
a50699fd | 1565 | copy_properties (source, t); |
439d5cb4 KR |
1566 | SET_INTERVAL_PARENT (t, parent); |
1567 | if (! NULL_LEFT_CHILD (source)) | |
1568 | t->left = reproduce_tree (source->left, t); | |
1569 | if (! NULL_RIGHT_CHILD (source)) | |
1570 | t->right = reproduce_tree (source->right, t); | |
1571 | ||
1572 | return t; | |
1573 | } | |
1574 | ||
1575 | static INTERVAL | |
971de7fb | 1576 | reproduce_tree_obj (INTERVAL source, Lisp_Object parent) |
439d5cb4 KR |
1577 | { |
1578 | register INTERVAL t = make_interval (); | |
1579 | ||
72af86bd | 1580 | memcpy (t, source, INTERVAL_SIZE); |
439d5cb4 KR |
1581 | copy_properties (source, t); |
1582 | SET_INTERVAL_OBJECT (t, parent); | |
a50699fd JA |
1583 | if (! NULL_LEFT_CHILD (source)) |
1584 | t->left = reproduce_tree (source->left, t); | |
1585 | if (! NULL_RIGHT_CHILD (source)) | |
1586 | t->right = reproduce_tree (source->right, t); | |
1587 | ||
1588 | return t; | |
1589 | } | |
1590 | ||
24e3d3bf JB |
1591 | #if 0 |
1592 | /* Nobody calls this. Perhaps it's a vestige of an earlier design. */ | |
1593 | ||
1d1d7ba0 JA |
1594 | /* Make a new interval of length LENGTH starting at START in the |
1595 | group of intervals INTERVALS, which is actually an interval tree. | |
1596 | Returns the new interval. | |
1597 | ||
1598 | Generate an error if the new positions would overlap an existing | |
7ce503fd | 1599 | interval. */ |
1d1d7ba0 | 1600 | |
a50699fd JA |
1601 | static INTERVAL |
1602 | make_new_interval (intervals, start, length) | |
1603 | INTERVAL intervals; | |
e79123aa | 1604 | EMACS_INT start, length; |
a50699fd JA |
1605 | { |
1606 | INTERVAL slot; | |
1607 | ||
1608 | slot = find_interval (intervals, start); | |
1609 | if (start + length > slot->position + LENGTH (slot)) | |
1610 | error ("Interval would overlap"); | |
1611 | ||
1612 | if (start == slot->position && length == LENGTH (slot)) | |
1613 | return slot; | |
1614 | ||
1615 | if (slot->position == start) | |
1616 | { | |
7ce503fd | 1617 | /* New right node. */ |
2bc7a79b | 1618 | split_interval_right (slot, length); |
a50699fd JA |
1619 | return slot; |
1620 | } | |
1621 | ||
1622 | if (slot->position + LENGTH (slot) == start + length) | |
1623 | { | |
7ce503fd | 1624 | /* New left node. */ |
2bc7a79b | 1625 | split_interval_left (slot, LENGTH (slot) - length); |
a50699fd JA |
1626 | return slot; |
1627 | } | |
1628 | ||
7ce503fd | 1629 | /* Convert interval SLOT into three intervals. */ |
2bc7a79b JB |
1630 | split_interval_left (slot, start - slot->position); |
1631 | split_interval_right (slot, length); | |
a50699fd JA |
1632 | return slot; |
1633 | } | |
24e3d3bf | 1634 | #endif |
294efdbe | 1635 | \f |
9c79dd1b | 1636 | /* Insert the intervals of SOURCE into BUFFER at POSITION. |
0b79989f | 1637 | LENGTH is the length of the text in SOURCE. |
a50699fd | 1638 | |
944d4e4b KH |
1639 | The `position' field of the SOURCE intervals is assumed to be |
1640 | consistent with its parent; therefore, SOURCE must be an | |
1641 | interval tree made with copy_interval or must be the whole | |
1642 | tree of a buffer or a string. | |
1643 | ||
2bc7a79b JB |
1644 | This is used in insdel.c when inserting Lisp_Strings into the |
1645 | buffer. The text corresponding to SOURCE is already in the buffer | |
1646 | when this is called. The intervals of new tree are a copy of those | |
1647 | belonging to the string being inserted; intervals are never | |
1648 | shared. | |
a50699fd | 1649 | |
0b79989f RS |
1650 | If the inserted text had no intervals associated, and we don't |
1651 | want to inherit the surrounding text's properties, this function | |
a50699fd | 1652 | simply returns -- offset_intervals should handle placing the |
90ba40fc | 1653 | text in the correct interval, depending on the sticky bits. |
a50699fd JA |
1654 | |
1655 | If the inserted text had properties (intervals), then there are two | |
1656 | cases -- either insertion happened in the middle of some interval, | |
1657 | or between two intervals. | |
1658 | ||
1659 | If the text goes into the middle of an interval, then new | |
1660 | intervals are created in the middle with only the properties of | |
1661 | the new text, *unless* the macro MERGE_INSERTIONS is true, in | |
1662 | which case the new text has the union of its properties and those | |
1663 | of the text into which it was inserted. | |
1664 | ||
1665 | If the text goes between two intervals, then if neither interval | |
90ba40fc JA |
1666 | had its appropriate sticky property set (front_sticky, rear_sticky), |
1667 | the new text has only its properties. If one of the sticky properties | |
a50699fd | 1668 | is set, then the new text "sticks" to that region and its properties |
eb8c3be9 | 1669 | depend on merging as above. If both the preceding and succeeding |
90ba40fc JA |
1670 | intervals to the new text are "sticky", then the new text retains |
1671 | only its properties, as if neither sticky property were set. Perhaps | |
a50699fd | 1672 | we should consider merging all three sets of properties onto the new |
7ce503fd | 1673 | text... */ |
a50699fd JA |
1674 | |
1675 | void | |
e79123aa EZ |
1676 | graft_intervals_into_buffer (INTERVAL source, EMACS_INT position, |
1677 | EMACS_INT length, struct buffer *buffer, | |
1678 | int inherit) | |
a50699fd | 1679 | { |
323a7ad4 | 1680 | register INTERVAL under, over, this, prev; |
e5d967c9 | 1681 | register INTERVAL tree; |
c50bd0d2 | 1682 | EMACS_INT over_used; |
a50699fd | 1683 | |
e5d967c9 RS |
1684 | tree = BUF_INTERVALS (buffer); |
1685 | ||
34e096ed RS |
1686 | /* If the new text has no properties, then with inheritance it |
1687 | becomes part of whatever interval it was inserted into. | |
1688 | To prevent inheritance, we must clear out the properties | |
1689 | of the newly inserted text. */ | |
9c79dd1b | 1690 | if (NULL_INTERVAL_P (source)) |
0b79989f RS |
1691 | { |
1692 | Lisp_Object buf; | |
201ffa57 | 1693 | if (!inherit && !NULL_INTERVAL_P (tree) && length > 0) |
0b79989f | 1694 | { |
55cfc731 | 1695 | XSETBUFFER (buf, buffer); |
34e096ed RS |
1696 | set_text_properties_1 (make_number (position), |
1697 | make_number (position + length), | |
1698 | Qnil, buf, 0); | |
0b79989f | 1699 | } |
e5d967c9 | 1700 | if (! NULL_INTERVAL_P (BUF_INTERVALS (buffer))) |
4867a283 | 1701 | /* Shouldn't be necessary. -stef */ |
e5d967c9 | 1702 | BUF_INTERVALS (buffer) = balance_an_interval (BUF_INTERVALS (buffer)); |
0b79989f RS |
1703 | return; |
1704 | } | |
a50699fd | 1705 | |
a50699fd JA |
1706 | if (NULL_INTERVAL_P (tree)) |
1707 | { | |
1708 | /* The inserted text constitutes the whole buffer, so | |
7ce503fd | 1709 | simply copy over the interval structure. */ |
2bc7a79b | 1710 | if ((BUF_Z (buffer) - BUF_BEG (buffer)) == TOTAL_LENGTH (source)) |
a50699fd | 1711 | { |
b8e4857c | 1712 | Lisp_Object buf; |
55cfc731 | 1713 | XSETBUFFER (buf, buffer); |
439d5cb4 | 1714 | BUF_INTERVALS (buffer) = reproduce_tree_obj (source, buf); |
4867a283 | 1715 | BUF_INTERVALS (buffer)->position = BEG; |
6b61353c | 1716 | BUF_INTERVALS (buffer)->up_obj = 1; |
944d4e4b KH |
1717 | |
1718 | /* Explicitly free the old tree here? */ | |
a50699fd JA |
1719 | |
1720 | return; | |
1721 | } | |
1722 | ||
1723 | /* Create an interval tree in which to place a copy | |
7ce503fd | 1724 | of the intervals of the inserted string. */ |
a50699fd | 1725 | { |
249a6da9 | 1726 | Lisp_Object buf; |
55cfc731 | 1727 | XSETBUFFER (buf, buffer); |
323a7ad4 | 1728 | tree = create_root_interval (buf); |
a50699fd JA |
1729 | } |
1730 | } | |
7ea69158 RS |
1731 | else if (TOTAL_LENGTH (tree) == TOTAL_LENGTH (source)) |
1732 | /* If the buffer contains only the new string, but | |
1733 | there was already some interval tree there, then it may be | |
1734 | some zero length intervals. Eventually, do something clever | |
1735 | about inserting properly. For now, just waste the old intervals. */ | |
1736 | { | |
439d5cb4 | 1737 | BUF_INTERVALS (buffer) = reproduce_tree (source, INTERVAL_PARENT (tree)); |
4867a283 | 1738 | BUF_INTERVALS (buffer)->position = BEG; |
6b61353c | 1739 | BUF_INTERVALS (buffer)->up_obj = 1; |
7ea69158 | 1740 | /* Explicitly free the old tree here. */ |
a50699fd | 1741 | |
7ea69158 RS |
1742 | return; |
1743 | } | |
1744 | /* Paranoia -- the text has already been added, so this buffer | |
1745 | should be of non-zero length. */ | |
1746 | else if (TOTAL_LENGTH (tree) == 0) | |
1747 | abort (); | |
a50699fd JA |
1748 | |
1749 | this = under = find_interval (tree, position); | |
1750 | if (NULL_INTERVAL_P (under)) /* Paranoia */ | |
1751 | abort (); | |
944d4e4b | 1752 | over = find_interval (source, interval_start_pos (source)); |
a50699fd | 1753 | |
323a7ad4 RS |
1754 | /* Here for insertion in the middle of an interval. |
1755 | Split off an equivalent interval to the right, | |
1756 | then don't bother with it any more. */ | |
a50699fd | 1757 | |
323a7ad4 | 1758 | if (position > under->position) |
a50699fd JA |
1759 | { |
1760 | INTERVAL end_unchanged | |
2bc7a79b | 1761 | = split_interval_left (this, position - under->position); |
a50699fd | 1762 | copy_properties (under, end_unchanged); |
323a7ad4 | 1763 | under->position = position; |
a50699fd | 1764 | } |
323a7ad4 RS |
1765 | else |
1766 | { | |
f56b42ac KH |
1767 | /* This call may have some effect because previous_interval may |
1768 | update `position' fields of intervals. Thus, don't ignore it | |
1769 | for the moment. Someone please tell me the truth (K.Handa). */ | |
323a7ad4 | 1770 | prev = previous_interval (under); |
f56b42ac KH |
1771 | #if 0 |
1772 | /* But, this code surely has no effect. And, anyway, | |
1773 | END_NONSTICKY_P is unreliable now. */ | |
7ce503fd | 1774 | if (prev && !END_NONSTICKY_P (prev)) |
323a7ad4 | 1775 | prev = 0; |
f56b42ac | 1776 | #endif /* 0 */ |
323a7ad4 RS |
1777 | } |
1778 | ||
1779 | /* Insertion is now at beginning of UNDER. */ | |
a50699fd | 1780 | |
323a7ad4 | 1781 | /* The inserted text "sticks" to the interval `under', |
7ce503fd RS |
1782 | which means it gets those properties. |
1783 | The properties of under are the result of | |
8e6208c5 | 1784 | adjust_intervals_for_insertion, so stickiness has |
7ce503fd | 1785 | already been taken care of. */ |
7d0393cf | 1786 | |
6b61353c KH |
1787 | /* OVER is the interval we are copying from next. |
1788 | OVER_USED says how many characters' worth of OVER | |
1789 | have already been copied into target intervals. | |
1790 | UNDER is the next interval in the target. */ | |
1791 | over_used = 0; | |
a50699fd JA |
1792 | while (! NULL_INTERVAL_P (over)) |
1793 | { | |
6b61353c KH |
1794 | /* If UNDER is longer than OVER, split it. */ |
1795 | if (LENGTH (over) - over_used < LENGTH (under)) | |
7ce503fd | 1796 | { |
6b61353c | 1797 | this = split_interval_left (under, LENGTH (over) - over_used); |
7ce503fd RS |
1798 | copy_properties (under, this); |
1799 | } | |
323a7ad4 RS |
1800 | else |
1801 | this = under; | |
6b61353c KH |
1802 | |
1803 | /* THIS is now the interval to copy or merge into. | |
1804 | OVER covers all of it. */ | |
7ea69158 | 1805 | if (inherit) |
7ce503fd RS |
1806 | merge_properties (over, this); |
1807 | else | |
1808 | copy_properties (over, this); | |
6b61353c KH |
1809 | |
1810 | /* If THIS and OVER end at the same place, | |
1811 | advance OVER to a new source interval. */ | |
1812 | if (LENGTH (this) == LENGTH (over) - over_used) | |
1813 | { | |
1814 | over = next_interval (over); | |
1815 | over_used = 0; | |
1816 | } | |
1817 | else | |
1818 | /* Otherwise just record that more of OVER has been used. */ | |
1819 | over_used += LENGTH (this); | |
1820 | ||
1821 | /* Always advance to a new target interval. */ | |
1822 | under = next_interval (this); | |
a50699fd JA |
1823 | } |
1824 | ||
e5d967c9 RS |
1825 | if (! NULL_INTERVAL_P (BUF_INTERVALS (buffer))) |
1826 | BUF_INTERVALS (buffer) = balance_an_interval (BUF_INTERVALS (buffer)); | |
a50699fd JA |
1827 | return; |
1828 | } | |
1829 | ||
5cae0ec6 RS |
1830 | /* Get the value of property PROP from PLIST, |
1831 | which is the plist of an interval. | |
7d0393cf | 1832 | We check for direct properties, for categories with property PROP, |
06d92327 | 1833 | and for PROP appearing on the default-text-properties list. */ |
5cae0ec6 RS |
1834 | |
1835 | Lisp_Object | |
971de7fb | 1836 | textget (Lisp_Object plist, register Lisp_Object prop) |
323a7ad4 | 1837 | { |
91b53904 | 1838 | return lookup_char_property (plist, prop, 1); |
948fe32d CW |
1839 | } |
1840 | ||
1841 | Lisp_Object | |
971de7fb | 1842 | lookup_char_property (Lisp_Object plist, register Lisp_Object prop, int textprop) |
948fe32d CW |
1843 | { |
1844 | register Lisp_Object tail, fallback = Qnil; | |
323a7ad4 | 1845 | |
91b53904 | 1846 | for (tail = plist; CONSP (tail); tail = Fcdr (XCDR (tail))) |
323a7ad4 RS |
1847 | { |
1848 | register Lisp_Object tem; | |
91b53904 | 1849 | tem = XCAR (tail); |
323a7ad4 | 1850 | if (EQ (prop, tem)) |
91b53904 | 1851 | return Fcar (XCDR (tail)); |
5cae0ec6 | 1852 | if (EQ (tem, Qcategory)) |
5dd6606e | 1853 | { |
91b53904 | 1854 | tem = Fcar (XCDR (tail)); |
5dd6606e RS |
1855 | if (SYMBOLP (tem)) |
1856 | fallback = Fget (tem, prop); | |
1857 | } | |
323a7ad4 | 1858 | } |
5cae0ec6 | 1859 | |
70743ff1 BG |
1860 | if (! NILP (fallback)) |
1861 | return fallback; | |
948fe32d CW |
1862 | /* Check for alternative properties */ |
1863 | tail = Fassq (prop, Vchar_property_alias_alist); | |
931285e2 LT |
1864 | if (! NILP (tail)) |
1865 | { | |
1866 | tail = XCDR (tail); | |
1867 | for (; NILP (fallback) && CONSP (tail); tail = XCDR (tail)) | |
1868 | fallback = Fplist_get (plist, XCAR (tail)); | |
1869 | } | |
1870 | ||
948fe32d CW |
1871 | if (textprop && NILP (fallback) && CONSP (Vdefault_text_properties)) |
1872 | fallback = Fplist_get (Vdefault_text_properties, prop); | |
1873 | return fallback; | |
323a7ad4 | 1874 | } |
7ce503fd | 1875 | |
294efdbe | 1876 | \f |
ef1900f3 RS |
1877 | /* Set point in BUFFER "temporarily" to CHARPOS, which corresponds to |
1878 | byte position BYTEPOS. */ | |
1879 | ||
1880 | INLINE void | |
6ba7f443 SM |
1881 | temp_set_point_both (struct buffer *buffer, |
1882 | EMACS_INT charpos, EMACS_INT bytepos) | |
ef1900f3 RS |
1883 | { |
1884 | /* In a single-byte buffer, the two positions must be equal. */ | |
1885 | if (BUF_ZV (buffer) == BUF_ZV_BYTE (buffer) | |
1886 | && charpos != bytepos) | |
1887 | abort (); | |
1888 | ||
1889 | if (charpos > bytepos) | |
1890 | abort (); | |
1891 | ||
1892 | if (charpos > BUF_ZV (buffer) || charpos < BUF_BEGV (buffer)) | |
1893 | abort (); | |
1894 | ||
1895 | BUF_PT_BYTE (buffer) = bytepos; | |
1896 | BUF_PT (buffer) = charpos; | |
1897 | } | |
1898 | ||
f8ab8c1f EZ |
1899 | /* Set point "temporarily", without checking any text properties. */ |
1900 | ||
1901 | INLINE void | |
1902 | temp_set_point (struct buffer *buffer, EMACS_INT charpos) | |
1903 | { | |
1904 | temp_set_point_both (buffer, charpos, | |
1905 | buf_charpos_to_bytepos (buffer, charpos)); | |
1906 | } | |
1907 | ||
7d0393cf | 1908 | /* Set point in BUFFER to CHARPOS. If the target position is |
f65013b0 | 1909 | before an intangible character, move to an ok place. */ |
a50699fd JA |
1910 | |
1911 | void | |
6ba7f443 | 1912 | set_point (EMACS_INT charpos) |
ef1900f3 | 1913 | { |
6ba7f443 | 1914 | set_point_both (charpos, buf_charpos_to_bytepos (current_buffer, charpos)); |
ef1900f3 RS |
1915 | } |
1916 | ||
f0dcf801 MB |
1917 | /* If there's an invisible character at position POS + TEST_OFFS in the |
1918 | current buffer, and the invisible property has a `stickiness' such that | |
1919 | inserting a character at position POS would inherit the property it, | |
1920 | return POS + ADJ, otherwise return POS. If TEST_INTANG is non-zero, | |
1921 | then intangibility is required as well as invisibleness. | |
1922 | ||
1923 | TEST_OFFS should be either 0 or -1, and ADJ should be either 1 or -1. | |
1924 | ||
1925 | Note that `stickiness' is determined by overlay marker insertion types, | |
7d0393cf | 1926 | if the invisible property comes from an overlay. */ |
f0dcf801 | 1927 | |
fe3537c3 | 1928 | static EMACS_INT |
e79123aa EZ |
1929 | adjust_for_invis_intang (EMACS_INT pos, EMACS_INT test_offs, EMACS_INT adj, |
1930 | int test_intang) | |
f0dcf801 MB |
1931 | { |
1932 | Lisp_Object invis_propval, invis_overlay; | |
1933 | Lisp_Object test_pos; | |
1934 | ||
1935 | if ((adj < 0 && pos + adj < BEGV) || (adj > 0 && pos + adj > ZV)) | |
1936 | /* POS + ADJ would be beyond the buffer bounds, so do no adjustment. */ | |
1937 | return pos; | |
1938 | ||
1939 | test_pos = make_number (pos + test_offs); | |
1940 | ||
1941 | invis_propval | |
1942 | = get_char_property_and_overlay (test_pos, Qinvisible, Qnil, | |
1943 | &invis_overlay); | |
1944 | ||
1945 | if ((!test_intang | |
1946 | || ! NILP (Fget_char_property (test_pos, Qintangible, Qnil))) | |
1947 | && TEXT_PROP_MEANS_INVISIBLE (invis_propval) | |
1948 | /* This next test is true if the invisible property has a stickiness | |
1949 | such that an insertion at POS would inherit it. */ | |
1950 | && (NILP (invis_overlay) | |
1951 | /* Invisible property is from a text-property. */ | |
4867a283 | 1952 | ? (text_property_stickiness (Qinvisible, make_number (pos), Qnil) |
f0dcf801 MB |
1953 | == (test_offs == 0 ? 1 : -1)) |
1954 | /* Invisible property is from an overlay. */ | |
1955 | : (test_offs == 0 | |
1956 | ? XMARKER (OVERLAY_START (invis_overlay))->insertion_type == 0 | |
1957 | : XMARKER (OVERLAY_END (invis_overlay))->insertion_type == 1))) | |
1958 | pos += adj; | |
1959 | ||
1960 | return pos; | |
1961 | } | |
1962 | ||
ef1900f3 | 1963 | /* Set point in BUFFER to CHARPOS, which corresponds to byte |
7d0393cf | 1964 | position BYTEPOS. If the target position is |
ef1900f3 RS |
1965 | before an intangible character, move to an ok place. */ |
1966 | ||
1967 | void | |
6ba7f443 | 1968 | set_point_both (EMACS_INT charpos, EMACS_INT bytepos) |
a50699fd | 1969 | { |
e39adcda | 1970 | register INTERVAL to, from, toprev, fromprev; |
6ba7f443 SM |
1971 | EMACS_INT buffer_point; |
1972 | EMACS_INT old_position = PT; | |
594a1605 CY |
1973 | /* This ensures that we move forward past intangible text when the |
1974 | initial position is the same as the destination, in the rare | |
1975 | instances where this is important, e.g. in line-move-finish | |
1976 | (simple.el). */ | |
ef1900f3 | 1977 | int backwards = (charpos < old_position ? 1 : 0); |
580fae94 | 1978 | int have_overlays; |
6ba7f443 | 1979 | EMACS_INT original_position; |
a50699fd | 1980 | |
4b4deea2 | 1981 | BVAR (current_buffer, point_before_scroll) = Qnil; |
b6a0ebc3 | 1982 | |
6ba7f443 | 1983 | if (charpos == PT) |
a50699fd JA |
1984 | return; |
1985 | ||
ef1900f3 | 1986 | /* In a single-byte buffer, the two positions must be equal. */ |
6ba7f443 | 1987 | eassert (ZV != ZV_BYTE || charpos == bytepos); |
ef1900f3 | 1988 | |
62056764 JB |
1989 | /* Check this now, before checking if the buffer has any intervals. |
1990 | That way, we can catch conditions which break this sanity check | |
1991 | whether or not there are intervals in the buffer. */ | |
6ba7f443 | 1992 | eassert (charpos <= ZV && charpos >= BEGV); |
62056764 | 1993 | |
6ba7f443 SM |
1994 | have_overlays = (current_buffer->overlays_before |
1995 | || current_buffer->overlays_after); | |
580fae94 RS |
1996 | |
1997 | /* If we have no text properties and overlays, | |
1998 | then we can do it quickly. */ | |
6ba7f443 | 1999 | if (NULL_INTERVAL_P (BUF_INTERVALS (current_buffer)) && ! have_overlays) |
a50699fd | 2000 | { |
6ba7f443 | 2001 | temp_set_point_both (current_buffer, charpos, bytepos); |
a50699fd JA |
2002 | return; |
2003 | } | |
2004 | ||
ef1900f3 RS |
2005 | /* Set TO to the interval containing the char after CHARPOS, |
2006 | and TOPREV to the interval containing the char before CHARPOS. | |
323a7ad4 | 2007 | Either one may be null. They may be equal. */ |
6ba7f443 SM |
2008 | to = find_interval (BUF_INTERVALS (current_buffer), charpos); |
2009 | if (charpos == BEGV) | |
294efdbe | 2010 | toprev = 0; |
ef1900f3 | 2011 | else if (to && to->position == charpos) |
323a7ad4 | 2012 | toprev = previous_interval (to); |
323a7ad4 RS |
2013 | else |
2014 | toprev = to; | |
2015 | ||
6ba7f443 | 2016 | buffer_point = (PT == ZV ? ZV - 1 : PT); |
9c79dd1b | 2017 | |
323a7ad4 RS |
2018 | /* Set FROM to the interval containing the char after PT, |
2019 | and FROMPREV to the interval containing the char before PT. | |
2020 | Either one may be null. They may be equal. */ | |
7ce503fd | 2021 | /* We could cache this and save time. */ |
6ba7f443 SM |
2022 | from = find_interval (BUF_INTERVALS (current_buffer), buffer_point); |
2023 | if (buffer_point == BEGV) | |
294efdbe | 2024 | fromprev = 0; |
6ba7f443 | 2025 | else if (from && from->position == PT) |
323a7ad4 | 2026 | fromprev = previous_interval (from); |
6ba7f443 | 2027 | else if (buffer_point != PT) |
323a7ad4 RS |
2028 | fromprev = from, from = 0; |
2029 | else | |
2030 | fromprev = from; | |
a50699fd | 2031 | |
7ce503fd | 2032 | /* Moving within an interval. */ |
580fae94 RS |
2033 | if (to == from && toprev == fromprev && INTERVAL_VISIBLE_P (to) |
2034 | && ! have_overlays) | |
a50699fd | 2035 | { |
6ba7f443 | 2036 | temp_set_point_both (current_buffer, charpos, bytepos); |
a50699fd JA |
2037 | return; |
2038 | } | |
2039 | ||
ef1900f3 | 2040 | original_position = charpos; |
580fae94 | 2041 | |
5eabb4e7 RS |
2042 | /* If the new position is between two intangible characters |
2043 | with the same intangible property value, | |
2044 | move forward or backward until a change in that property. */ | |
580fae94 RS |
2045 | if (NILP (Vinhibit_point_motion_hooks) |
2046 | && ((! NULL_INTERVAL_P (to) && ! NULL_INTERVAL_P (toprev)) | |
b827a9e3 RS |
2047 | || have_overlays) |
2048 | /* Intangibility never stops us from positioning at the beginning | |
2049 | or end of the buffer, so don't bother checking in that case. */ | |
ef1900f3 | 2050 | && charpos != BEGV && charpos != ZV) |
a50699fd | 2051 | { |
580fae94 | 2052 | Lisp_Object pos; |
f0dcf801 | 2053 | Lisp_Object intangible_propval; |
580fae94 | 2054 | |
d5219de5 RS |
2055 | if (backwards) |
2056 | { | |
0270b877 | 2057 | /* If the preceding character is both intangible and invisible, |
f0dcf801 MB |
2058 | and the invisible property is `rear-sticky', perturb it so |
2059 | that the search starts one character earlier -- this ensures | |
2060 | that point can never move to the end of an invisible/ | |
2061 | intangible/rear-sticky region. */ | |
2062 | charpos = adjust_for_invis_intang (charpos, -1, -1, 1); | |
1d14d232 | 2063 | |
f0dcf801 | 2064 | XSETINT (pos, charpos); |
5eabb4e7 RS |
2065 | |
2066 | /* If following char is intangible, | |
2067 | skip back over all chars with matching intangible property. */ | |
1d14d232 RS |
2068 | |
2069 | intangible_propval = Fget_char_property (pos, Qintangible, Qnil); | |
2070 | ||
5eabb4e7 | 2071 | if (! NILP (intangible_propval)) |
1d14d232 | 2072 | { |
6ba7f443 | 2073 | while (XINT (pos) > BEGV |
1d14d232 RS |
2074 | && EQ (Fget_char_property (make_number (XINT (pos) - 1), |
2075 | Qintangible, Qnil), | |
2076 | intangible_propval)) | |
2077 | pos = Fprevious_char_property_change (pos, Qnil); | |
f0dcf801 MB |
2078 | |
2079 | /* Set CHARPOS from POS, and if the final intangible character | |
2080 | that we skipped over is also invisible, and the invisible | |
2081 | property is `front-sticky', perturb it to be one character | |
2082 | earlier -- this ensures that point can never move to the | |
2083 | beginning of an invisible/intangible/front-sticky region. */ | |
2084 | charpos = adjust_for_invis_intang (XINT (pos), 0, -1, 0); | |
1d14d232 | 2085 | } |
d5219de5 | 2086 | } |
0df8950e | 2087 | else |
d5219de5 | 2088 | { |
f0dcf801 MB |
2089 | /* If the following character is both intangible and invisible, |
2090 | and the invisible property is `front-sticky', perturb it so | |
2091 | that the search starts one character later -- this ensures | |
2092 | that point can never move to the beginning of an | |
2093 | invisible/intangible/front-sticky region. */ | |
2094 | charpos = adjust_for_invis_intang (charpos, 0, 1, 1); | |
2095 | ||
2096 | XSETINT (pos, charpos); | |
2097 | ||
1d14d232 RS |
2098 | /* If preceding char is intangible, |
2099 | skip forward over all chars with matching intangible property. */ | |
2100 | ||
ef1900f3 | 2101 | intangible_propval = Fget_char_property (make_number (charpos - 1), |
580fae94 | 2102 | Qintangible, Qnil); |
5eabb4e7 | 2103 | |
5eabb4e7 | 2104 | if (! NILP (intangible_propval)) |
1d14d232 | 2105 | { |
6ba7f443 | 2106 | while (XINT (pos) < ZV |
1d14d232 RS |
2107 | && EQ (Fget_char_property (pos, Qintangible, Qnil), |
2108 | intangible_propval)) | |
2109 | pos = Fnext_char_property_change (pos, Qnil); | |
580fae94 | 2110 | |
f0dcf801 MB |
2111 | /* Set CHARPOS from POS, and if the final intangible character |
2112 | that we skipped over is also invisible, and the invisible | |
2113 | property is `rear-sticky', perturb it to be one character | |
2114 | later -- this ensures that point can never move to the | |
2115 | end of an invisible/intangible/rear-sticky region. */ | |
2116 | charpos = adjust_for_invis_intang (XINT (pos), -1, 1, 0); | |
1d14d232 | 2117 | } |
d5219de5 | 2118 | } |
580fae94 | 2119 | |
6ba7f443 | 2120 | bytepos = buf_charpos_to_bytepos (current_buffer, charpos); |
580fae94 RS |
2121 | } |
2122 | ||
ef1900f3 | 2123 | if (charpos != original_position) |
580fae94 | 2124 | { |
ef1900f3 RS |
2125 | /* Set TO to the interval containing the char after CHARPOS, |
2126 | and TOPREV to the interval containing the char before CHARPOS. | |
580fae94 | 2127 | Either one may be null. They may be equal. */ |
6ba7f443 SM |
2128 | to = find_interval (BUF_INTERVALS (current_buffer), charpos); |
2129 | if (charpos == BEGV) | |
580fae94 | 2130 | toprev = 0; |
ef1900f3 | 2131 | else if (to && to->position == charpos) |
580fae94 RS |
2132 | toprev = previous_interval (to); |
2133 | else | |
2134 | toprev = to; | |
a50699fd | 2135 | } |
323a7ad4 | 2136 | |
5eabb4e7 RS |
2137 | /* Here TO is the interval after the stopping point |
2138 | and TOPREV is the interval before the stopping point. | |
2139 | One or the other may be null. */ | |
2140 | ||
6ba7f443 | 2141 | temp_set_point_both (current_buffer, charpos, bytepos); |
a50699fd | 2142 | |
e0f24100 | 2143 | /* We run point-left and point-entered hooks here, if the |
d7e3e52b | 2144 | two intervals are not equivalent. These hooks take |
323a7ad4 | 2145 | (old_point, new_point) as arguments. */ |
ddd931ff RS |
2146 | if (NILP (Vinhibit_point_motion_hooks) |
2147 | && (! intervals_equal (from, to) | |
2148 | || ! intervals_equal (fromprev, toprev))) | |
9c79dd1b | 2149 | { |
323a7ad4 RS |
2150 | Lisp_Object leave_after, leave_before, enter_after, enter_before; |
2151 | ||
2152 | if (fromprev) | |
4e8f005c | 2153 | leave_before = textget (fromprev->plist, Qpoint_left); |
323a7ad4 | 2154 | else |
4e8f005c CY |
2155 | leave_before = Qnil; |
2156 | ||
323a7ad4 | 2157 | if (from) |
4e8f005c | 2158 | leave_after = textget (from->plist, Qpoint_left); |
323a7ad4 | 2159 | else |
4e8f005c | 2160 | leave_after = Qnil; |
323a7ad4 RS |
2161 | |
2162 | if (toprev) | |
4e8f005c | 2163 | enter_before = textget (toprev->plist, Qpoint_entered); |
323a7ad4 | 2164 | else |
4e8f005c CY |
2165 | enter_before = Qnil; |
2166 | ||
323a7ad4 | 2167 | if (to) |
4e8f005c | 2168 | enter_after = textget (to->plist, Qpoint_entered); |
323a7ad4 | 2169 | else |
4e8f005c | 2170 | enter_after = Qnil; |
9c79dd1b | 2171 | |
323a7ad4 | 2172 | if (! EQ (leave_before, enter_before) && !NILP (leave_before)) |
4e8f005c CY |
2173 | call2 (leave_before, make_number (old_position), |
2174 | make_number (charpos)); | |
323a7ad4 | 2175 | if (! EQ (leave_after, enter_after) && !NILP (leave_after)) |
4e8f005c CY |
2176 | call2 (leave_after, make_number (old_position), |
2177 | make_number (charpos)); | |
9c79dd1b | 2178 | |
323a7ad4 | 2179 | if (! EQ (enter_before, leave_before) && !NILP (enter_before)) |
4e8f005c CY |
2180 | call2 (enter_before, make_number (old_position), |
2181 | make_number (charpos)); | |
323a7ad4 | 2182 | if (! EQ (enter_after, leave_after) && !NILP (enter_after)) |
4e8f005c CY |
2183 | call2 (enter_after, make_number (old_position), |
2184 | make_number (charpos)); | |
9c79dd1b | 2185 | } |
a50699fd | 2186 | } |
294efdbe | 2187 | \f |
a7fa233f RS |
2188 | /* Move point to POSITION, unless POSITION is inside an intangible |
2189 | segment that reaches all the way to point. */ | |
2190 | ||
2191 | void | |
e79123aa | 2192 | move_if_not_intangible (EMACS_INT position) |
a7fa233f RS |
2193 | { |
2194 | Lisp_Object pos; | |
2195 | Lisp_Object intangible_propval; | |
2196 | ||
2197 | XSETINT (pos, position); | |
2198 | ||
2199 | if (! NILP (Vinhibit_point_motion_hooks)) | |
2200 | /* If intangible is inhibited, always move point to POSITION. */ | |
2201 | ; | |
2e34157c | 2202 | else if (PT < position && XINT (pos) < ZV) |
a7fa233f RS |
2203 | { |
2204 | /* We want to move forward, so check the text before POSITION. */ | |
2205 | ||
2206 | intangible_propval = Fget_char_property (pos, | |
2207 | Qintangible, Qnil); | |
2208 | ||
2209 | /* If following char is intangible, | |
2210 | skip back over all chars with matching intangible property. */ | |
2211 | if (! NILP (intangible_propval)) | |
2212 | while (XINT (pos) > BEGV | |
2213 | && EQ (Fget_char_property (make_number (XINT (pos) - 1), | |
2214 | Qintangible, Qnil), | |
2215 | intangible_propval)) | |
2216 | pos = Fprevious_char_property_change (pos, Qnil); | |
2217 | } | |
2e34157c | 2218 | else if (XINT (pos) > BEGV) |
a7fa233f RS |
2219 | { |
2220 | /* We want to move backward, so check the text after POSITION. */ | |
2221 | ||
2222 | intangible_propval = Fget_char_property (make_number (XINT (pos) - 1), | |
2223 | Qintangible, Qnil); | |
2224 | ||
2225 | /* If following char is intangible, | |
887f2a2d | 2226 | skip forward over all chars with matching intangible property. */ |
a7fa233f RS |
2227 | if (! NILP (intangible_propval)) |
2228 | while (XINT (pos) < ZV | |
2229 | && EQ (Fget_char_property (pos, Qintangible, Qnil), | |
2230 | intangible_propval)) | |
2231 | pos = Fnext_char_property_change (pos, Qnil); | |
2232 | ||
2233 | } | |
97d8f112 RS |
2234 | else if (position < BEGV) |
2235 | position = BEGV; | |
2236 | else if (position > ZV) | |
2237 | position = ZV; | |
a7fa233f | 2238 | |
7d0393cf | 2239 | /* If the whole stretch between PT and POSITION isn't intangible, |
a7fa233f RS |
2240 | try moving to POSITION (which means we actually move farther |
2241 | if POSITION is inside of intangible text). */ | |
2242 | ||
2243 | if (XINT (pos) != PT) | |
2244 | SET_PT (position); | |
2245 | } | |
2246 | \f | |
f56b42ac KH |
2247 | /* If text at position POS has property PROP, set *VAL to the property |
2248 | value, *START and *END to the beginning and end of a region that | |
2249 | has the same property, and return 1. Otherwise return 0. | |
2250 | ||
2251 | OBJECT is the string or buffer to look for the property in; | |
2252 | nil means the current buffer. */ | |
2253 | ||
2254 | int | |
579c18d0 EZ |
2255 | get_property_and_range (EMACS_INT pos, Lisp_Object prop, Lisp_Object *val, |
2256 | EMACS_INT *start, EMACS_INT *end, Lisp_Object object) | |
f56b42ac KH |
2257 | { |
2258 | INTERVAL i, prev, next; | |
2259 | ||
2260 | if (NILP (object)) | |
2261 | i = find_interval (BUF_INTERVALS (current_buffer), pos); | |
2262 | else if (BUFFERP (object)) | |
2263 | i = find_interval (BUF_INTERVALS (XBUFFER (object)), pos); | |
2264 | else if (STRINGP (object)) | |
d5db4077 | 2265 | i = find_interval (STRING_INTERVALS (object), pos); |
f56b42ac KH |
2266 | else |
2267 | abort (); | |
2268 | ||
2269 | if (NULL_INTERVAL_P (i) || (i->position + LENGTH (i) <= pos)) | |
2270 | return 0; | |
2271 | *val = textget (i->plist, prop); | |
2272 | if (NILP (*val)) | |
2273 | return 0; | |
2274 | ||
2275 | next = i; /* remember it in advance */ | |
2276 | prev = previous_interval (i); | |
2277 | while (! NULL_INTERVAL_P (prev) | |
2278 | && EQ (*val, textget (prev->plist, prop))) | |
2279 | i = prev, prev = previous_interval (prev); | |
2280 | *start = i->position; | |
2281 | ||
2282 | next = next_interval (i); | |
7d0393cf | 2283 | while (! NULL_INTERVAL_P (next) |
f56b42ac KH |
2284 | && EQ (*val, textget (next->plist, prop))) |
2285 | i = next, next = next_interval (next); | |
2286 | *end = i->position + LENGTH (i); | |
2287 | ||
2288 | return 1; | |
2289 | } | |
2290 | \f | |
2b4b027f GM |
2291 | /* Return the proper local keymap TYPE for position POSITION in |
2292 | BUFFER; TYPE should be one of `keymap' or `local-map'. Use the map | |
2293 | specified by the PROP property, if any. Otherwise, if TYPE is | |
1b0440ed RS |
2294 | `local-map' use BUFFER's local map. |
2295 | ||
2296 | POSITION must be in the accessible part of BUFFER. */ | |
5cae0ec6 RS |
2297 | |
2298 | Lisp_Object | |
e79123aa EZ |
2299 | get_local_map (register EMACS_INT position, register struct buffer *buffer, |
2300 | Lisp_Object type) | |
5cae0ec6 | 2301 | { |
f94ecad1 | 2302 | Lisp_Object prop, lispy_position, lispy_buffer; |
e79123aa | 2303 | EMACS_INT old_begv, old_zv, old_begv_byte, old_zv_byte; |
5cae0ec6 | 2304 | |
7ce503fd | 2305 | /* Perhaps we should just change `position' to the limit. */ |
1b0440ed | 2306 | if (position > BUF_ZV (buffer) || position < BUF_BEGV (buffer)) |
5cae0ec6 RS |
2307 | abort (); |
2308 | ||
0f7a5fda KH |
2309 | /* Ignore narrowing, so that a local map continues to be valid even if |
2310 | the visible region contains no characters and hence no properties. */ | |
2311 | old_begv = BUF_BEGV (buffer); | |
2312 | old_zv = BUF_ZV (buffer); | |
ef1900f3 RS |
2313 | old_begv_byte = BUF_BEGV_BYTE (buffer); |
2314 | old_zv_byte = BUF_ZV_BYTE (buffer); | |
0f7a5fda KH |
2315 | BUF_BEGV (buffer) = BUF_BEG (buffer); |
2316 | BUF_ZV (buffer) = BUF_Z (buffer); | |
ef1900f3 RS |
2317 | BUF_BEGV_BYTE (buffer) = BUF_BEG_BYTE (buffer); |
2318 | BUF_ZV_BYTE (buffer) = BUF_Z_BYTE (buffer); | |
0f7a5fda | 2319 | |
0f7a5fda KH |
2320 | XSETFASTINT (lispy_position, position); |
2321 | XSETBUFFER (lispy_buffer, buffer); | |
4867a283 SM |
2322 | /* First check if the CHAR has any property. This is because when |
2323 | we click with the mouse, the mouse pointer is really pointing | |
2324 | to the CHAR after POS. */ | |
2b4b027f | 2325 | prop = Fget_char_property (lispy_position, type, lispy_buffer); |
4867a283 SM |
2326 | /* If not, look at the POS's properties. This is necessary because when |
2327 | editing a field with a `local-map' property, we want insertion at the end | |
2328 | to obey the `local-map' property. */ | |
2329 | if (NILP (prop)) | |
2330 | prop = get_pos_property (lispy_position, type, lispy_buffer); | |
0f7a5fda KH |
2331 | |
2332 | BUF_BEGV (buffer) = old_begv; | |
2333 | BUF_ZV (buffer) = old_zv; | |
ef1900f3 RS |
2334 | BUF_BEGV_BYTE (buffer) = old_begv_byte; |
2335 | BUF_ZV_BYTE (buffer) = old_zv_byte; | |
5cae0ec6 RS |
2336 | |
2337 | /* Use the local map only if it is valid. */ | |
02067692 SM |
2338 | prop = get_keymap (prop, 0, 0); |
2339 | if (CONSP (prop)) | |
5cae0ec6 RS |
2340 | return prop; |
2341 | ||
2b4b027f | 2342 | if (EQ (type, Qkeymap)) |
6a7dccef DL |
2343 | return Qnil; |
2344 | else | |
4b4deea2 | 2345 | return BVAR (buffer, keymap); |
5cae0ec6 RS |
2346 | } |
2347 | \f | |
9c79dd1b | 2348 | /* Produce an interval tree reflecting the intervals in |
944d4e4b KH |
2349 | TREE from START to START + LENGTH. |
2350 | The new interval tree has no parent and has a starting-position of 0. */ | |
a50699fd | 2351 | |
7b1d5b85 | 2352 | INTERVAL |
e79123aa | 2353 | copy_intervals (INTERVAL tree, EMACS_INT start, EMACS_INT length) |
a50699fd JA |
2354 | { |
2355 | register INTERVAL i, new, t; | |
c50bd0d2 | 2356 | register EMACS_INT got, prevlen; |
a50699fd JA |
2357 | |
2358 | if (NULL_INTERVAL_P (tree) || length <= 0) | |
2359 | return NULL_INTERVAL; | |
2360 | ||
2361 | i = find_interval (tree, start); | |
2362 | if (NULL_INTERVAL_P (i) || LENGTH (i) == 0) | |
2363 | abort (); | |
2364 | ||
7ce503fd | 2365 | /* If there is only one interval and it's the default, return nil. */ |
a50699fd JA |
2366 | if ((start - i->position + 1 + length) < LENGTH (i) |
2367 | && DEFAULT_INTERVAL_P (i)) | |
2368 | return NULL_INTERVAL; | |
2369 | ||
2370 | new = make_interval (); | |
944d4e4b | 2371 | new->position = 0; |
a50699fd | 2372 | got = (LENGTH (i) - (start - i->position)); |
9c79dd1b | 2373 | new->total_length = length; |
727fec2d | 2374 | CHECK_TOTAL_LENGTH (new); |
a50699fd JA |
2375 | copy_properties (i, new); |
2376 | ||
2377 | t = new; | |
95e3e1ef | 2378 | prevlen = got; |
a50699fd JA |
2379 | while (got < length) |
2380 | { | |
2381 | i = next_interval (i); | |
2bc7a79b | 2382 | t = split_interval_right (t, prevlen); |
a50699fd | 2383 | copy_properties (i, t); |
95e3e1ef RS |
2384 | prevlen = LENGTH (i); |
2385 | got += prevlen; | |
a50699fd JA |
2386 | } |
2387 | ||
4314dea4 | 2388 | return balance_an_interval (new); |
a50699fd JA |
2389 | } |
2390 | ||
7ce503fd | 2391 | /* Give STRING the properties of BUFFER from POSITION to LENGTH. */ |
a50699fd | 2392 | |
d7e3e52b | 2393 | INLINE void |
e79123aa EZ |
2394 | copy_intervals_to_string (Lisp_Object string, struct buffer *buffer, |
2395 | EMACS_INT position, EMACS_INT length) | |
a50699fd | 2396 | { |
46d8a55b | 2397 | INTERVAL interval_copy = copy_intervals (BUF_INTERVALS (buffer), |
a50699fd JA |
2398 | position, length); |
2399 | if (NULL_INTERVAL_P (interval_copy)) | |
2400 | return; | |
2401 | ||
439d5cb4 | 2402 | SET_INTERVAL_OBJECT (interval_copy, string); |
b13738b6 | 2403 | STRING_SET_INTERVALS (string, interval_copy); |
a50699fd | 2404 | } |
d8638d30 | 2405 | \f |
944d4e4b | 2406 | /* Return 1 if strings S1 and S2 have identical properties; 0 otherwise. |
d8638d30 RS |
2407 | Assume they have identical characters. */ |
2408 | ||
2409 | int | |
971de7fb | 2410 | compare_string_intervals (Lisp_Object s1, Lisp_Object s2) |
d8638d30 RS |
2411 | { |
2412 | INTERVAL i1, i2; | |
e79123aa EZ |
2413 | EMACS_INT pos = 0; |
2414 | EMACS_INT end = SCHARS (s1); | |
d8638d30 | 2415 | |
d5db4077 KR |
2416 | i1 = find_interval (STRING_INTERVALS (s1), 0); |
2417 | i2 = find_interval (STRING_INTERVALS (s2), 0); | |
d8638d30 RS |
2418 | |
2419 | while (pos < end) | |
2420 | { | |
2421 | /* Determine how far we can go before we reach the end of I1 or I2. */ | |
e79123aa EZ |
2422 | EMACS_INT len1 = (i1 != 0 ? INTERVAL_LAST_POS (i1) : end) - pos; |
2423 | EMACS_INT len2 = (i2 != 0 ? INTERVAL_LAST_POS (i2) : end) - pos; | |
2424 | EMACS_INT distance = min (len1, len2); | |
d8638d30 RS |
2425 | |
2426 | /* If we ever find a mismatch between the strings, | |
2427 | they differ. */ | |
2428 | if (! intervals_equal (i1, i2)) | |
2429 | return 0; | |
2430 | ||
2431 | /* Advance POS till the end of the shorter interval, | |
2432 | and advance one or both interval pointers for the new position. */ | |
2433 | pos += distance; | |
2434 | if (len1 == distance) | |
2435 | i1 = next_interval (i1); | |
2436 | if (len2 == distance) | |
2437 | i2 = next_interval (i2); | |
2438 | } | |
2439 | return 1; | |
2440 | } | |
37f26f3c | 2441 | \f |
37f26f3c RS |
2442 | /* Recursively adjust interval I in the current buffer |
2443 | for setting enable_multibyte_characters to MULTI_FLAG. | |
2444 | The range of interval I is START ... END in characters, | |
2445 | START_BYTE ... END_BYTE in bytes. */ | |
2446 | ||
2447 | static void | |
e79123aa EZ |
2448 | set_intervals_multibyte_1 (INTERVAL i, int multi_flag, |
2449 | EMACS_INT start, EMACS_INT start_byte, | |
2450 | EMACS_INT end, EMACS_INT end_byte) | |
37f26f3c | 2451 | { |
37f26f3c RS |
2452 | /* Fix the length of this interval. */ |
2453 | if (multi_flag) | |
2454 | i->total_length = end - start; | |
2455 | else | |
2456 | i->total_length = end_byte - start_byte; | |
727fec2d RS |
2457 | CHECK_TOTAL_LENGTH (i); |
2458 | ||
2459 | if (TOTAL_LENGTH (i) == 0) | |
2460 | { | |
2461 | delete_interval (i); | |
2462 | return; | |
2463 | } | |
37f26f3c RS |
2464 | |
2465 | /* Recursively fix the length of the subintervals. */ | |
2466 | if (i->left) | |
2467 | { | |
e79123aa | 2468 | EMACS_INT left_end, left_end_byte; |
37f26f3c RS |
2469 | |
2470 | if (multi_flag) | |
2471 | { | |
e79123aa | 2472 | EMACS_INT temp; |
37f26f3c RS |
2473 | left_end_byte = start_byte + LEFT_TOTAL_LENGTH (i); |
2474 | left_end = BYTE_TO_CHAR (left_end_byte); | |
727fec2d RS |
2475 | |
2476 | temp = CHAR_TO_BYTE (left_end); | |
2477 | ||
2478 | /* If LEFT_END_BYTE is in the middle of a character, | |
f813361d | 2479 | adjust it and LEFT_END to a char boundary. */ |
727fec2d RS |
2480 | if (left_end_byte > temp) |
2481 | { | |
2482 | left_end_byte = temp; | |
2483 | } | |
2484 | if (left_end_byte < temp) | |
2485 | { | |
2486 | left_end--; | |
2487 | left_end_byte = CHAR_TO_BYTE (left_end); | |
2488 | } | |
37f26f3c RS |
2489 | } |
2490 | else | |
2491 | { | |
2492 | left_end = start + LEFT_TOTAL_LENGTH (i); | |
2493 | left_end_byte = CHAR_TO_BYTE (left_end); | |
2494 | } | |
2495 | ||
2496 | set_intervals_multibyte_1 (i->left, multi_flag, start, start_byte, | |
2497 | left_end, left_end_byte); | |
2498 | } | |
2499 | if (i->right) | |
2500 | { | |
e79123aa | 2501 | EMACS_INT right_start_byte, right_start; |
37f26f3c RS |
2502 | |
2503 | if (multi_flag) | |
2504 | { | |
e79123aa | 2505 | EMACS_INT temp; |
727fec2d | 2506 | |
37f26f3c RS |
2507 | right_start_byte = end_byte - RIGHT_TOTAL_LENGTH (i); |
2508 | right_start = BYTE_TO_CHAR (right_start_byte); | |
727fec2d RS |
2509 | |
2510 | /* If RIGHT_START_BYTE is in the middle of a character, | |
f813361d | 2511 | adjust it and RIGHT_START to a char boundary. */ |
727fec2d RS |
2512 | temp = CHAR_TO_BYTE (right_start); |
2513 | ||
2514 | if (right_start_byte < temp) | |
2515 | { | |
2516 | right_start_byte = temp; | |
2517 | } | |
2518 | if (right_start_byte > temp) | |
2519 | { | |
2520 | right_start++; | |
2521 | right_start_byte = CHAR_TO_BYTE (right_start); | |
2522 | } | |
37f26f3c RS |
2523 | } |
2524 | else | |
2525 | { | |
2526 | right_start = end - RIGHT_TOTAL_LENGTH (i); | |
2527 | right_start_byte = CHAR_TO_BYTE (right_start); | |
2528 | } | |
2529 | ||
2530 | set_intervals_multibyte_1 (i->right, multi_flag, | |
2531 | right_start, right_start_byte, | |
2532 | end, end_byte); | |
2533 | } | |
727fec2d RS |
2534 | |
2535 | /* Rounding to char boundaries can theoretically ake this interval | |
2536 | spurious. If so, delete one child, and copy its property list | |
2537 | to this interval. */ | |
2538 | if (LEFT_TOTAL_LENGTH (i) + RIGHT_TOTAL_LENGTH (i) >= TOTAL_LENGTH (i)) | |
2539 | { | |
2540 | if ((i)->left) | |
2541 | { | |
2542 | (i)->plist = (i)->left->plist; | |
2543 | (i)->left->total_length = 0; | |
2544 | delete_interval ((i)->left); | |
2545 | } | |
2546 | else | |
2547 | { | |
2548 | (i)->plist = (i)->right->plist; | |
2549 | (i)->right->total_length = 0; | |
2550 | delete_interval ((i)->right); | |
2551 | } | |
2552 | } | |
37f26f3c | 2553 | } |
d2f7a802 | 2554 | |
24cef261 RS |
2555 | /* Update the intervals of the current buffer |
2556 | to fit the contents as multibyte (if MULTI_FLAG is 1) | |
2557 | or to fit them as non-multibyte (if MULTI_FLAG is 0). */ | |
2558 | ||
2559 | void | |
971de7fb | 2560 | set_intervals_multibyte (int multi_flag) |
24cef261 RS |
2561 | { |
2562 | if (BUF_INTERVALS (current_buffer)) | |
2563 | set_intervals_multibyte_1 (BUF_INTERVALS (current_buffer), multi_flag, | |
2564 | BEG, BEG_BYTE, Z, Z_BYTE); | |
2565 | } | |
6b61353c | 2566 |