Commit | Line | Data |
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1389ad71 | 1 | /* Markers: examining, setting and deleting. |
acaf905b | 2 | Copyright (C) 1985, 1997-1998, 2001-2012 Free Software Foundation, Inc. |
dcfdbac7 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
dcfdbac7 | 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. | |
dcfdbac7 JB |
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/>. */ |
dcfdbac7 JB |
18 | |
19 | ||
18160b98 | 20 | #include <config.h> |
0328b6de | 21 | |
dcfdbac7 | 22 | #include "lisp.h" |
83be827a | 23 | #include "character.h" |
e5560ff7 | 24 | #include "buffer.h" |
dcfdbac7 | 25 | |
1389ad71 RS |
26 | /* Record one cached position found recently by |
27 | buf_charpos_to_bytepos or buf_bytepos_to_charpos. */ | |
28 | ||
d311d28c PE |
29 | static ptrdiff_t cached_charpos; |
30 | static ptrdiff_t cached_bytepos; | |
1389ad71 | 31 | static struct buffer *cached_buffer; |
fd2f90cf | 32 | static EMACS_INT cached_modiff; |
31f8ab72 | 33 | |
f1f924b6 DA |
34 | /* Juanma Barranquero <lekktu@gmail.com> reported ~3x increased |
35 | bootstrap time when byte_char_debug_check is enabled; so this | |
36 | is never turned on by --enable-checking configure option. */ | |
37 | ||
38 | #ifdef MARKER_DEBUG | |
80d26f99 | 39 | |
90fc4786 | 40 | extern int count_markers (struct buffer *) EXTERNALLY_VISIBLE; |
f1f924b6 | 41 | extern ptrdiff_t verify_bytepos (ptrdiff_t charpos) EXTERNALLY_VISIBLE; |
90fc4786 DA |
42 | |
43 | static void | |
44 | byte_char_debug_check (struct buffer *b, ptrdiff_t charpos, ptrdiff_t bytepos) | |
45 | { | |
9d44f8ce DA |
46 | ptrdiff_t nchars; |
47 | ||
48 | if (NILP (BVAR (b, enable_multibyte_characters))) | |
49 | return; | |
90fc4786 DA |
50 | |
51 | if (bytepos > BUF_GPT_BYTE (b)) | |
9d44f8ce DA |
52 | nchars |
53 | = multibyte_chars_in_text (BUF_BEG_ADDR (b), | |
54 | BUF_GPT_BYTE (b) - BUF_BEG_BYTE (b)) | |
55 | + multibyte_chars_in_text (BUF_GAP_END_ADDR (b), | |
56 | bytepos - BUF_GPT_BYTE (b)); | |
90fc4786 DA |
57 | else |
58 | nchars = multibyte_chars_in_text (BUF_BEG_ADDR (b), | |
59 | bytepos - BUF_BEG_BYTE (b)); | |
60 | ||
61 | if (charpos - 1 != nchars) | |
1088b922 | 62 | emacs_abort (); |
90fc4786 DA |
63 | } |
64 | ||
f1f924b6 | 65 | #else /* not MARKER_DEBUG */ |
90fc4786 | 66 | |
e2688e4a | 67 | #define byte_char_debug_check(b, charpos, bytepos) do { } while (0) |
90fc4786 | 68 | |
f1f924b6 | 69 | #endif /* MARKER_DEBUG */ |
1088b922 | 70 | |
dfcf069d | 71 | void |
971de7fb | 72 | clear_charpos_cache (struct buffer *b) |
31f8ab72 RS |
73 | { |
74 | if (cached_buffer == b) | |
75 | cached_buffer = 0; | |
76 | } | |
1389ad71 RS |
77 | \f |
78 | /* Converting between character positions and byte positions. */ | |
79 | ||
80 | /* There are several places in the buffer where we know | |
3f67ae94 | 81 | the correspondence: BEG, BEGV, PT, GPT, ZV and Z, |
1389ad71 RS |
82 | and everywhere there is a marker. So we find the one of these places |
83 | that is closest to the specified position, and scan from there. */ | |
84 | ||
13002885 | 85 | /* This macro is a subroutine of buf_charpos_to_bytepos. |
1389ad71 RS |
86 | Note that it is desirable that BYTEPOS is not evaluated |
87 | except when we really want its value. */ | |
88 | ||
89 | #define CONSIDER(CHARPOS, BYTEPOS) \ | |
90 | { \ | |
d311d28c | 91 | ptrdiff_t this_charpos = (CHARPOS); \ |
7cded46f | 92 | bool changed = 0; \ |
1389ad71 RS |
93 | \ |
94 | if (this_charpos == charpos) \ | |
6e57421b | 95 | { \ |
d311d28c | 96 | ptrdiff_t value = (BYTEPOS); \ |
90fc4786 DA |
97 | \ |
98 | byte_char_debug_check (b, charpos, value); \ | |
6e57421b RS |
99 | return value; \ |
100 | } \ | |
1389ad71 RS |
101 | else if (this_charpos > charpos) \ |
102 | { \ | |
103 | if (this_charpos < best_above) \ | |
104 | { \ | |
105 | best_above = this_charpos; \ | |
106 | best_above_byte = (BYTEPOS); \ | |
107 | changed = 1; \ | |
108 | } \ | |
109 | } \ | |
110 | else if (this_charpos > best_below) \ | |
111 | { \ | |
112 | best_below = this_charpos; \ | |
113 | best_below_byte = (BYTEPOS); \ | |
114 | changed = 1; \ | |
115 | } \ | |
116 | \ | |
117 | if (changed) \ | |
118 | { \ | |
119 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 120 | { \ |
d311d28c | 121 | ptrdiff_t value = best_below_byte + (charpos - best_below); \ |
90fc4786 DA |
122 | \ |
123 | byte_char_debug_check (b, charpos, value); \ | |
6e57421b RS |
124 | return value; \ |
125 | } \ | |
1389ad71 RS |
126 | } \ |
127 | } | |
128 | ||
13002885 | 129 | /* Return the byte position corresponding to CHARPOS in B. */ |
1389ad71 | 130 | |
d311d28c PE |
131 | ptrdiff_t |
132 | buf_charpos_to_bytepos (struct buffer *b, ptrdiff_t charpos) | |
1389ad71 | 133 | { |
5e097e00 | 134 | struct Lisp_Marker *tail; |
d311d28c PE |
135 | ptrdiff_t best_above, best_above_byte; |
136 | ptrdiff_t best_below, best_below_byte; | |
1389ad71 | 137 | |
13002885 | 138 | eassert (BUF_BEG (b) <= charpos && charpos <= BUF_Z (b)); |
1389ad71 RS |
139 | |
140 | best_above = BUF_Z (b); | |
141 | best_above_byte = BUF_Z_BYTE (b); | |
142 | ||
143 | /* If this buffer has as many characters as bytes, | |
144 | each character must be one byte. | |
145 | This takes care of the case where enable-multibyte-characters is nil. */ | |
146 | if (best_above == best_above_byte) | |
147 | return charpos; | |
148 | ||
3ab364ce SM |
149 | best_below = BEG; |
150 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
151 | |
152 | /* We find in best_above and best_above_byte | |
153 | the closest known point above CHARPOS, | |
154 | and in best_below and best_below_byte | |
155 | the closest known point below CHARPOS, | |
156 | ||
157 | If at any point we can tell that the space between those | |
158 | two best approximations is all single-byte, | |
159 | we interpolate the result immediately. */ | |
160 | ||
161 | CONSIDER (BUF_PT (b), BUF_PT_BYTE (b)); | |
162 | CONSIDER (BUF_GPT (b), BUF_GPT_BYTE (b)); | |
163 | CONSIDER (BUF_BEGV (b), BUF_BEGV_BYTE (b)); | |
164 | CONSIDER (BUF_ZV (b), BUF_ZV_BYTE (b)); | |
165 | ||
166 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
167 | CONSIDER (cached_charpos, cached_bytepos); | |
168 | ||
5e097e00 | 169 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 170 | { |
5e097e00 | 171 | CONSIDER (tail->charpos, tail->bytepos); |
1389ad71 RS |
172 | |
173 | /* If we are down to a range of 50 chars, | |
174 | don't bother checking any other markers; | |
175 | scan the intervening chars directly now. */ | |
176 | if (best_above - best_below < 50) | |
177 | break; | |
1389ad71 RS |
178 | } |
179 | ||
180 | /* We get here if we did not exactly hit one of the known places. | |
181 | We have one known above and one known below. | |
182 | Scan, counting characters, from whichever one is closer. */ | |
183 | ||
184 | if (charpos - best_below < best_above - charpos) | |
185 | { | |
7cded46f | 186 | bool record = charpos - best_below > 5000; |
1389ad71 RS |
187 | |
188 | while (best_below != charpos) | |
189 | { | |
190 | best_below++; | |
191 | BUF_INC_POS (b, best_below_byte); | |
192 | } | |
193 | ||
194 | /* If this position is quite far from the nearest known position, | |
195 | cache the correspondence by creating a marker here. | |
196 | It will last until the next GC. */ | |
197 | if (record) | |
657924ff | 198 | build_marker (b, best_below, best_below_byte); |
1389ad71 | 199 | |
9d44f8ce | 200 | byte_char_debug_check (b, best_below, best_below_byte); |
6e57421b | 201 | |
1389ad71 RS |
202 | cached_buffer = b; |
203 | cached_modiff = BUF_MODIFF (b); | |
204 | cached_charpos = best_below; | |
205 | cached_bytepos = best_below_byte; | |
206 | ||
207 | return best_below_byte; | |
208 | } | |
209 | else | |
210 | { | |
7cded46f | 211 | bool record = best_above - charpos > 5000; |
1389ad71 RS |
212 | |
213 | while (best_above != charpos) | |
214 | { | |
215 | best_above--; | |
216 | BUF_DEC_POS (b, best_above_byte); | |
217 | } | |
218 | ||
219 | /* If this position is quite far from the nearest known position, | |
220 | cache the correspondence by creating a marker here. | |
221 | It will last until the next GC. */ | |
222 | if (record) | |
657924ff | 223 | build_marker (b, best_above, best_above_byte); |
1389ad71 | 224 | |
9d44f8ce | 225 | byte_char_debug_check (b, best_above, best_above_byte); |
6e57421b | 226 | |
1389ad71 RS |
227 | cached_buffer = b; |
228 | cached_modiff = BUF_MODIFF (b); | |
229 | cached_charpos = best_above; | |
230 | cached_bytepos = best_above_byte; | |
231 | ||
232 | return best_above_byte; | |
233 | } | |
234 | } | |
235 | ||
236 | #undef CONSIDER | |
55a91ea3 | 237 | |
b4c3046a | 238 | /* This macro is a subroutine of buf_bytepos_to_charpos. |
1389ad71 RS |
239 | It is used when BYTEPOS is actually the byte position. */ |
240 | ||
241 | #define CONSIDER(BYTEPOS, CHARPOS) \ | |
242 | { \ | |
d311d28c | 243 | ptrdiff_t this_bytepos = (BYTEPOS); \ |
1389ad71 RS |
244 | int changed = 0; \ |
245 | \ | |
246 | if (this_bytepos == bytepos) \ | |
6e57421b | 247 | { \ |
d311d28c | 248 | ptrdiff_t value = (CHARPOS); \ |
90fc4786 DA |
249 | \ |
250 | byte_char_debug_check (b, value, bytepos); \ | |
6e57421b RS |
251 | return value; \ |
252 | } \ | |
1389ad71 RS |
253 | else if (this_bytepos > bytepos) \ |
254 | { \ | |
255 | if (this_bytepos < best_above_byte) \ | |
256 | { \ | |
257 | best_above = (CHARPOS); \ | |
258 | best_above_byte = this_bytepos; \ | |
259 | changed = 1; \ | |
260 | } \ | |
261 | } \ | |
262 | else if (this_bytepos > best_below_byte) \ | |
263 | { \ | |
264 | best_below = (CHARPOS); \ | |
265 | best_below_byte = this_bytepos; \ | |
266 | changed = 1; \ | |
267 | } \ | |
268 | \ | |
269 | if (changed) \ | |
270 | { \ | |
271 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 272 | { \ |
d311d28c | 273 | ptrdiff_t value = best_below + (bytepos - best_below_byte); \ |
90fc4786 DA |
274 | \ |
275 | byte_char_debug_check (b, value, bytepos); \ | |
6e57421b RS |
276 | return value; \ |
277 | } \ | |
1389ad71 RS |
278 | } \ |
279 | } | |
280 | ||
13002885 DA |
281 | /* Return the character position corresponding to BYTEPOS in B. */ |
282 | ||
d311d28c PE |
283 | ptrdiff_t |
284 | buf_bytepos_to_charpos (struct buffer *b, ptrdiff_t bytepos) | |
1389ad71 | 285 | { |
5e097e00 | 286 | struct Lisp_Marker *tail; |
d311d28c PE |
287 | ptrdiff_t best_above, best_above_byte; |
288 | ptrdiff_t best_below, best_below_byte; | |
1389ad71 | 289 | |
13002885 | 290 | eassert (BUF_BEG_BYTE (b) <= bytepos && bytepos <= BUF_Z_BYTE (b)); |
1389ad71 RS |
291 | |
292 | best_above = BUF_Z (b); | |
293 | best_above_byte = BUF_Z_BYTE (b); | |
294 | ||
295 | /* If this buffer has as many characters as bytes, | |
296 | each character must be one byte. | |
297 | This takes care of the case where enable-multibyte-characters is nil. */ | |
298 | if (best_above == best_above_byte) | |
299 | return bytepos; | |
300 | ||
3ab364ce SM |
301 | best_below = BEG; |
302 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
303 | |
304 | CONSIDER (BUF_PT_BYTE (b), BUF_PT (b)); | |
305 | CONSIDER (BUF_GPT_BYTE (b), BUF_GPT (b)); | |
306 | CONSIDER (BUF_BEGV_BYTE (b), BUF_BEGV (b)); | |
307 | CONSIDER (BUF_ZV_BYTE (b), BUF_ZV (b)); | |
308 | ||
309 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
310 | CONSIDER (cached_bytepos, cached_charpos); | |
311 | ||
5e097e00 | 312 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 313 | { |
5e097e00 | 314 | CONSIDER (tail->bytepos, tail->charpos); |
1389ad71 RS |
315 | |
316 | /* If we are down to a range of 50 chars, | |
317 | don't bother checking any other markers; | |
318 | scan the intervening chars directly now. */ | |
319 | if (best_above - best_below < 50) | |
320 | break; | |
1389ad71 RS |
321 | } |
322 | ||
323 | /* We get here if we did not exactly hit one of the known places. | |
324 | We have one known above and one known below. | |
325 | Scan, counting characters, from whichever one is closer. */ | |
326 | ||
327 | if (bytepos - best_below_byte < best_above_byte - bytepos) | |
328 | { | |
7cded46f | 329 | bool record = bytepos - best_below_byte > 5000; |
1389ad71 RS |
330 | |
331 | while (best_below_byte < bytepos) | |
332 | { | |
333 | best_below++; | |
334 | BUF_INC_POS (b, best_below_byte); | |
335 | } | |
336 | ||
337 | /* If this position is quite far from the nearest known position, | |
338 | cache the correspondence by creating a marker here. | |
7693a579 RS |
339 | It will last until the next GC. |
340 | But don't do it if BUF_MARKERS is nil; | |
341 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 342 | if (record && BUF_MARKERS (b)) |
657924ff | 343 | build_marker (b, best_below, best_below_byte); |
1389ad71 | 344 | |
9d44f8ce | 345 | byte_char_debug_check (b, best_below, best_below_byte); |
6e57421b | 346 | |
1389ad71 RS |
347 | cached_buffer = b; |
348 | cached_modiff = BUF_MODIFF (b); | |
349 | cached_charpos = best_below; | |
350 | cached_bytepos = best_below_byte; | |
351 | ||
352 | return best_below; | |
353 | } | |
354 | else | |
355 | { | |
7cded46f | 356 | bool record = best_above_byte - bytepos > 5000; |
1389ad71 RS |
357 | |
358 | while (best_above_byte > bytepos) | |
359 | { | |
360 | best_above--; | |
361 | BUF_DEC_POS (b, best_above_byte); | |
362 | } | |
363 | ||
364 | /* If this position is quite far from the nearest known position, | |
365 | cache the correspondence by creating a marker here. | |
7693a579 RS |
366 | It will last until the next GC. |
367 | But don't do it if BUF_MARKERS is nil; | |
368 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 369 | if (record && BUF_MARKERS (b)) |
657924ff | 370 | build_marker (b, best_above, best_above_byte); |
1389ad71 | 371 | |
9d44f8ce | 372 | byte_char_debug_check (b, best_above, best_above_byte); |
6e57421b | 373 | |
1389ad71 RS |
374 | cached_buffer = b; |
375 | cached_modiff = BUF_MODIFF (b); | |
376 | cached_charpos = best_above; | |
377 | cached_bytepos = best_above_byte; | |
378 | ||
379 | return best_above; | |
380 | } | |
381 | } | |
382 | ||
383 | #undef CONSIDER | |
384 | \f | |
dcfdbac7 JB |
385 | /* Operations on markers. */ |
386 | ||
a7ca3326 | 387 | DEFUN ("marker-buffer", Fmarker_buffer, Smarker_buffer, 1, 1, 0, |
2e1280f8 PJ |
388 | doc: /* Return the buffer that MARKER points into, or nil if none. |
389 | Returns nil if MARKER points into a dead buffer. */) | |
5842a27b | 390 | (register Lisp_Object marker) |
dcfdbac7 JB |
391 | { |
392 | register Lisp_Object buf; | |
b7826503 | 393 | CHECK_MARKER (marker); |
dcfdbac7 JB |
394 | if (XMARKER (marker)->buffer) |
395 | { | |
0e11d869 | 396 | XSETBUFFER (buf, XMARKER (marker)->buffer); |
0754c46a SM |
397 | /* If the buffer is dead, we're in trouble: the buffer pointer here |
398 | does not preserve the buffer from being GC'd (it's weak), so | |
399 | markers have to be unlinked from their buffer as soon as the buffer | |
400 | is killed. */ | |
e578f381 | 401 | eassert (BUFFER_LIVE_P (XBUFFER (buf))); |
0754c46a | 402 | return buf; |
dcfdbac7 JB |
403 | } |
404 | return Qnil; | |
405 | } | |
406 | ||
a7ca3326 | 407 | DEFUN ("marker-position", Fmarker_position, Smarker_position, 1, 1, 0, |
243d70e5 JL |
408 | doc: /* Return the position MARKER points at, as a character number. |
409 | Returns nil if MARKER points nowhere. */) | |
5842a27b | 410 | (Lisp_Object marker) |
dcfdbac7 | 411 | { |
b7826503 | 412 | CHECK_MARKER (marker); |
dcfdbac7 | 413 | if (XMARKER (marker)->buffer) |
1389ad71 | 414 | return make_number (XMARKER (marker)->charpos); |
dcfdbac7 | 415 | |
dcfdbac7 JB |
416 | return Qnil; |
417 | } | |
4e57b342 DA |
418 | |
419 | /* Change M so it points to B at CHARPOS and BYTEPOS. */ | |
420 | ||
b0ab8123 | 421 | static void |
4e57b342 DA |
422 | attach_marker (struct Lisp_Marker *m, struct buffer *b, |
423 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
424 | { | |
d36d71df DA |
425 | /* In a single-byte buffer, two positions must be equal. |
426 | Otherwise, every character is at least one byte. */ | |
427 | if (BUF_Z (b) == BUF_Z_BYTE (b)) | |
428 | eassert (charpos == bytepos); | |
429 | else | |
430 | eassert (charpos <= bytepos); | |
4e57b342 DA |
431 | |
432 | m->charpos = charpos; | |
433 | m->bytepos = bytepos; | |
434 | ||
435 | if (m->buffer != b) | |
436 | { | |
437 | unchain_marker (m); | |
438 | m->buffer = b; | |
439 | m->next = BUF_MARKERS (b); | |
440 | BUF_MARKERS (b) = m; | |
441 | } | |
442 | } | |
443 | ||
d36d71df DA |
444 | /* If BUFFER is nil, return current buffer pointer. Next, check |
445 | whether BUFFER is a buffer object and return buffer pointer | |
446 | corresponding to BUFFER if BUFFER is live, or NULL otherwise. */ | |
dcfdbac7 | 447 | |
b0ab8123 | 448 | static struct buffer * |
d36d71df DA |
449 | live_buffer (Lisp_Object buffer) |
450 | { | |
451 | struct buffer *b; | |
5e097e00 | 452 | |
d36d71df | 453 | if (NILP (buffer)) |
dcfdbac7 | 454 | { |
d36d71df | 455 | b = current_buffer; |
e578f381 | 456 | eassert (BUFFER_LIVE_P (b)); |
dcfdbac7 | 457 | } |
dcfdbac7 JB |
458 | else |
459 | { | |
b7826503 | 460 | CHECK_BUFFER (buffer); |
dcfdbac7 | 461 | b = XBUFFER (buffer); |
e578f381 | 462 | if (!BUFFER_LIVE_P (b)) |
d36d71df | 463 | b = NULL; |
1389ad71 | 464 | } |
d36d71df | 465 | return b; |
dcfdbac7 JB |
466 | } |
467 | ||
d36d71df DA |
468 | /* Internal function to set MARKER in BUFFER at POSITION. Non-zero |
469 | RESTRICTED means limit the POSITION by the visible part of BUFFER. */ | |
dcfdbac7 | 470 | |
b0ab8123 | 471 | static Lisp_Object |
d36d71df | 472 | set_marker_internal (Lisp_Object marker, Lisp_Object position, |
7cded46f | 473 | Lisp_Object buffer, bool restricted) |
dcfdbac7 | 474 | { |
7cded46f PE |
475 | struct Lisp_Marker *m; |
476 | struct buffer *b = live_buffer (buffer); | |
dcfdbac7 | 477 | |
b7826503 | 478 | CHECK_MARKER (marker); |
5e097e00 SM |
479 | m = XMARKER (marker); |
480 | ||
d36d71df DA |
481 | /* Set MARKER to point nowhere if BUFFER is dead, or |
482 | POSITION is nil or a marker points to nowhere. */ | |
483 | if (NILP (position) | |
484 | || (MARKERP (position) && !XMARKER (position)->buffer) | |
485 | || !b) | |
486 | unchain_marker (m); | |
487 | ||
488 | /* Optimize the special case where we are copying the position of | |
489 | an existing marker, and MARKER is already in the same buffer. */ | |
490 | else if (MARKERP (position) && b == XMARKER (position)->buffer | |
491 | && b == m->buffer) | |
dcfdbac7 | 492 | { |
d36d71df DA |
493 | m->bytepos = XMARKER (position)->bytepos; |
494 | m->charpos = XMARKER (position)->charpos; | |
dcfdbac7 JB |
495 | } |
496 | ||
dcfdbac7 JB |
497 | else |
498 | { | |
d36d71df | 499 | register ptrdiff_t charpos, bytepos; |
1088b922 | 500 | |
d36d71df DA |
501 | CHECK_NUMBER_COERCE_MARKER (position); |
502 | charpos = clip_to_bounds (restricted ? BUF_BEGV (b) : BUF_BEG (b), | |
503 | XINT (position), | |
504 | restricted ? BUF_ZV (b) : BUF_Z (b)); | |
505 | bytepos = buf_charpos_to_bytepos (b, charpos); | |
506 | attach_marker (m, b, charpos, bytepos); | |
dcfdbac7 | 507 | } |
d36d71df DA |
508 | return marker; |
509 | } | |
dcfdbac7 | 510 | |
d36d71df DA |
511 | DEFUN ("set-marker", Fset_marker, Sset_marker, 2, 3, 0, |
512 | doc: /* Position MARKER before character number POSITION in BUFFER, | |
513 | which defaults to the current buffer. If POSITION is nil, | |
514 | makes marker point nowhere so it no longer slows down | |
515 | editing in any buffer. Returns MARKER. */) | |
516 | (Lisp_Object marker, Lisp_Object position, Lisp_Object buffer) | |
517 | { | |
518 | return set_marker_internal (marker, position, buffer, 0); | |
519 | } | |
1389ad71 | 520 | |
d36d71df | 521 | /* Like the above, but won't let the position be outside the visible part. */ |
177c0ea7 | 522 | |
d36d71df DA |
523 | Lisp_Object |
524 | set_marker_restricted (Lisp_Object marker, Lisp_Object position, | |
525 | Lisp_Object buffer) | |
526 | { | |
527 | return set_marker_internal (marker, position, buffer, 1); | |
dcfdbac7 | 528 | } |
d36d71df | 529 | |
1389ad71 RS |
530 | /* Set the position of MARKER, specifying both the |
531 | character position and the corresponding byte position. */ | |
dcfdbac7 | 532 | |
177c0ea7 | 533 | Lisp_Object |
d36d71df DA |
534 | set_marker_both (Lisp_Object marker, Lisp_Object buffer, |
535 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
1389ad71 | 536 | { |
1389ad71 | 537 | register struct Lisp_Marker *m; |
d36d71df | 538 | register struct buffer *b = live_buffer (buffer); |
1389ad71 | 539 | |
b7826503 | 540 | CHECK_MARKER (marker); |
5e097e00 | 541 | m = XMARKER (marker); |
1389ad71 | 542 | |
d36d71df DA |
543 | if (b) |
544 | attach_marker (m, b, charpos, bytepos); | |
1389ad71 | 545 | else |
d36d71df | 546 | unchain_marker (m); |
1389ad71 RS |
547 | return marker; |
548 | } | |
549 | ||
d36d71df | 550 | /* Like the above, but won't let the position be outside the visible part. */ |
1389ad71 | 551 | |
177c0ea7 | 552 | Lisp_Object |
d36d71df DA |
553 | set_marker_restricted_both (Lisp_Object marker, Lisp_Object buffer, |
554 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
1389ad71 | 555 | { |
1389ad71 | 556 | register struct Lisp_Marker *m; |
d36d71df | 557 | register struct buffer *b = live_buffer (buffer); |
1389ad71 | 558 | |
b7826503 | 559 | CHECK_MARKER (marker); |
5e097e00 | 560 | m = XMARKER (marker); |
1389ad71 | 561 | |
d36d71df | 562 | if (b) |
1389ad71 | 563 | { |
1088b922 PE |
564 | attach_marker |
565 | (m, b, | |
d36d71df DA |
566 | clip_to_bounds (BUF_BEGV (b), charpos, BUF_ZV (b)), |
567 | clip_to_bounds (BUF_BEGV_BYTE (b), bytepos, BUF_ZV_BYTE (b))); | |
1389ad71 | 568 | } |
d36d71df DA |
569 | else |
570 | unchain_marker (m); | |
1389ad71 RS |
571 | return marker; |
572 | } | |
d36d71df | 573 | |
7b7ae965 DA |
574 | /* Remove MARKER from the chain of whatever buffer it is in, |
575 | leaving it points to nowhere. This is called during garbage | |
576 | collection, so we must be careful to ignore and preserve | |
577 | mark bits, including those in chain fields of markers. */ | |
dcfdbac7 | 578 | |
c0323249 | 579 | void |
971de7fb | 580 | unchain_marker (register struct Lisp_Marker *marker) |
dcfdbac7 | 581 | { |
7b7ae965 | 582 | register struct buffer *b = marker->buffer; |
dcfdbac7 | 583 | |
7b7ae965 | 584 | if (b) |
dcfdbac7 | 585 | { |
7b7ae965 DA |
586 | register struct Lisp_Marker *tail, **prev; |
587 | ||
588 | /* No dead buffers here. */ | |
e578f381 | 589 | eassert (BUFFER_LIVE_P (b)); |
7b7ae965 DA |
590 | |
591 | marker->buffer = NULL; | |
592 | prev = &BUF_MARKERS (b); | |
593 | ||
594 | for (tail = BUF_MARKERS (b); tail; prev = &tail->next, tail = *prev) | |
595 | if (marker == tail) | |
596 | { | |
597 | if (*prev == BUF_MARKERS (b)) | |
598 | { | |
1088b922 | 599 | /* Deleting first marker from the buffer's chain. Crash |
7b7ae965 DA |
600 | if new first marker in chain does not say it belongs |
601 | to the same buffer, or at least that they have the same | |
602 | base buffer. */ | |
603 | if (tail->next && b->text != tail->next->buffer->text) | |
1088b922 | 604 | emacs_abort (); |
7b7ae965 DA |
605 | } |
606 | *prev = tail->next; | |
607 | /* We have removed the marker from the chain; | |
608 | no need to scan the rest of the chain. */ | |
609 | break; | |
610 | } | |
611 | ||
612 | /* Error if marker was not in it's chain. */ | |
613 | eassert (tail != NULL); | |
dcfdbac7 | 614 | } |
dcfdbac7 JB |
615 | } |
616 | ||
1389ad71 | 617 | /* Return the char position of marker MARKER, as a C integer. */ |
d281a86a | 618 | |
d311d28c | 619 | ptrdiff_t |
971de7fb | 620 | marker_position (Lisp_Object marker) |
dcfdbac7 JB |
621 | { |
622 | register struct Lisp_Marker *m = XMARKER (marker); | |
623 | register struct buffer *buf = m->buffer; | |
1389ad71 RS |
624 | |
625 | if (!buf) | |
626 | error ("Marker does not point anywhere"); | |
627 | ||
4e57b342 DA |
628 | eassert (BUF_BEG (buf) <= m->charpos && m->charpos <= BUF_Z (buf)); |
629 | ||
1389ad71 RS |
630 | return m->charpos; |
631 | } | |
632 | ||
633 | /* Return the byte position of marker MARKER, as a C integer. */ | |
634 | ||
d311d28c | 635 | ptrdiff_t |
971de7fb | 636 | marker_byte_position (Lisp_Object marker) |
1389ad71 RS |
637 | { |
638 | register struct Lisp_Marker *m = XMARKER (marker); | |
639 | register struct buffer *buf = m->buffer; | |
dcfdbac7 JB |
640 | |
641 | if (!buf) | |
642 | error ("Marker does not point anywhere"); | |
643 | ||
4e57b342 | 644 | eassert (BUF_BEG_BYTE (buf) <= m->bytepos && m->bytepos <= BUF_Z_BYTE (buf)); |
dcfdbac7 | 645 | |
4e57b342 | 646 | return m->bytepos; |
dcfdbac7 | 647 | } |
fc299663 | 648 | \f |
a7ca3326 | 649 | DEFUN ("copy-marker", Fcopy_marker, Scopy_marker, 0, 2, 0, |
2e1280f8 PJ |
650 | doc: /* Return a new marker pointing at the same place as MARKER. |
651 | If argument is a number, makes a new marker pointing | |
652 | at that position in the current buffer. | |
cd196f12 | 653 | If MARKER is not specified, the new marker does not point anywhere. |
2e1280f8 PJ |
654 | The optional argument TYPE specifies the insertion type of the new marker; |
655 | see `marker-insertion-type'. */) | |
5842a27b | 656 | (register Lisp_Object marker, Lisp_Object type) |
dcfdbac7 JB |
657 | { |
658 | register Lisp_Object new; | |
659 | ||
cd196f12 | 660 | if (!NILP (marker)) |
0b4331b7 | 661 | CHECK_TYPE (INTEGERP (marker) || MARKERP (marker), Qinteger_or_marker_p, marker); |
0469366f KH |
662 | |
663 | new = Fmake_marker (); | |
664 | Fset_marker (new, marker, | |
665 | (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil)); | |
666 | XMARKER (new)->insertion_type = !NILP (type); | |
667 | return new; | |
fc299663 RS |
668 | } |
669 | ||
670 | DEFUN ("marker-insertion-type", Fmarker_insertion_type, | |
671 | Smarker_insertion_type, 1, 1, 0, | |
2e1280f8 | 672 | doc: /* Return insertion type of MARKER: t if it stays after inserted text. |
1961ac0f | 673 | The value nil means the marker stays before text inserted there. */) |
5842a27b | 674 | (register Lisp_Object marker) |
fc299663 | 675 | { |
b7826503 | 676 | CHECK_MARKER (marker); |
fc299663 RS |
677 | return XMARKER (marker)->insertion_type ? Qt : Qnil; |
678 | } | |
679 | ||
680 | DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type, | |
681 | Sset_marker_insertion_type, 2, 2, 0, | |
2e1280f8 PJ |
682 | doc: /* Set the insertion-type of MARKER to TYPE. |
683 | If TYPE is t, it means the marker advances when you insert text at it. | |
684 | If TYPE is nil, it means the marker stays behind when you insert text at it. */) | |
5842a27b | 685 | (Lisp_Object marker, Lisp_Object type) |
fc299663 | 686 | { |
b7826503 | 687 | CHECK_MARKER (marker); |
fc299663 RS |
688 | |
689 | XMARKER (marker)->insertion_type = ! NILP (type); | |
690 | return type; | |
dcfdbac7 | 691 | } |
9e5896c6 RS |
692 | |
693 | DEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, Sbuffer_has_markers_at, | |
2e1280f8 PJ |
694 | 1, 1, 0, |
695 | doc: /* Return t if there are markers pointing at POSITION in the current buffer. */) | |
5842a27b | 696 | (Lisp_Object position) |
9e5896c6 | 697 | { |
5e097e00 | 698 | register struct Lisp_Marker *tail; |
4e57b342 | 699 | register ptrdiff_t charpos; |
9e5896c6 | 700 | |
4e57b342 | 701 | charpos = clip_to_bounds (BEG, XINT (position), Z); |
9e5896c6 | 702 | |
5e097e00 | 703 | for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next) |
4e57b342 | 704 | if (tail->charpos == charpos) |
9e5896c6 RS |
705 | return Qt; |
706 | ||
707 | return Qnil; | |
708 | } | |
59d36066 | 709 | |
f1f924b6 | 710 | #ifdef MARKER_DEBUG |
90fc4786 | 711 | |
59d36066 RS |
712 | /* For debugging -- count the markers in buffer BUF. */ |
713 | ||
714 | int | |
971de7fb | 715 | count_markers (struct buffer *buf) |
59d36066 RS |
716 | { |
717 | int total = 0; | |
5e097e00 | 718 | struct Lisp_Marker *tail; |
59d36066 | 719 | |
5e097e00 | 720 | for (tail = BUF_MARKERS (buf); tail; tail = tail->next) |
59d36066 RS |
721 | total++; |
722 | ||
723 | return total; | |
724 | } | |
90fc4786 | 725 | |
f1f924b6 DA |
726 | /* For debugging -- recompute the bytepos corresponding |
727 | to CHARPOS in the simplest, most reliable way. */ | |
728 | ||
729 | ptrdiff_t | |
730 | verify_bytepos (ptrdiff_t charpos) | |
731 | { | |
732 | ptrdiff_t below = 1; | |
733 | ptrdiff_t below_byte = 1; | |
734 | ||
735 | while (below != charpos) | |
736 | { | |
737 | below++; | |
738 | BUF_INC_POS (current_buffer, below_byte); | |
739 | } | |
740 | ||
741 | return below_byte; | |
742 | } | |
743 | ||
744 | #endif /* MARKER_DEBUG */ | |
dcfdbac7 | 745 | \f |
c0323249 | 746 | void |
971de7fb | 747 | syms_of_marker (void) |
dcfdbac7 JB |
748 | { |
749 | defsubr (&Smarker_position); | |
750 | defsubr (&Smarker_buffer); | |
751 | defsubr (&Sset_marker); | |
752 | defsubr (&Scopy_marker); | |
fc299663 RS |
753 | defsubr (&Smarker_insertion_type); |
754 | defsubr (&Sset_marker_insertion_type); | |
9e5896c6 | 755 | defsubr (&Sbuffer_has_markers_at); |
dcfdbac7 | 756 | } |