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 RS |
31 | static struct buffer *cached_buffer; |
32 | static 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 | ||
85 | /* charpos_to_bytepos returns the byte position corresponding to CHARPOS. */ | |
86 | ||
87 | /* This macro is a subroutine of charpos_to_bytepos. | |
88 | Note that it is desirable that BYTEPOS is not evaluated | |
89 | except when we really want its value. */ | |
90 | ||
91 | #define CONSIDER(CHARPOS, BYTEPOS) \ | |
92 | { \ | |
d311d28c | 93 | ptrdiff_t this_charpos = (CHARPOS); \ |
1389ad71 RS |
94 | int changed = 0; \ |
95 | \ | |
96 | if (this_charpos == charpos) \ | |
6e57421b | 97 | { \ |
d311d28c | 98 | ptrdiff_t value = (BYTEPOS); \ |
90fc4786 DA |
99 | \ |
100 | byte_char_debug_check (b, charpos, value); \ | |
6e57421b RS |
101 | return value; \ |
102 | } \ | |
1389ad71 RS |
103 | else if (this_charpos > charpos) \ |
104 | { \ | |
105 | if (this_charpos < best_above) \ | |
106 | { \ | |
107 | best_above = this_charpos; \ | |
108 | best_above_byte = (BYTEPOS); \ | |
109 | changed = 1; \ | |
110 | } \ | |
111 | } \ | |
112 | else if (this_charpos > best_below) \ | |
113 | { \ | |
114 | best_below = this_charpos; \ | |
115 | best_below_byte = (BYTEPOS); \ | |
116 | changed = 1; \ | |
117 | } \ | |
118 | \ | |
119 | if (changed) \ | |
120 | { \ | |
121 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 122 | { \ |
d311d28c | 123 | ptrdiff_t value = best_below_byte + (charpos - best_below); \ |
90fc4786 DA |
124 | \ |
125 | byte_char_debug_check (b, charpos, value); \ | |
6e57421b RS |
126 | return value; \ |
127 | } \ | |
1389ad71 RS |
128 | } \ |
129 | } | |
130 | ||
d311d28c PE |
131 | ptrdiff_t |
132 | charpos_to_bytepos (ptrdiff_t charpos) | |
1389ad71 RS |
133 | { |
134 | return buf_charpos_to_bytepos (current_buffer, charpos); | |
135 | } | |
136 | ||
d311d28c PE |
137 | ptrdiff_t |
138 | buf_charpos_to_bytepos (struct buffer *b, ptrdiff_t charpos) | |
1389ad71 | 139 | { |
5e097e00 | 140 | struct Lisp_Marker *tail; |
d311d28c PE |
141 | ptrdiff_t best_above, best_above_byte; |
142 | ptrdiff_t best_below, best_below_byte; | |
1389ad71 RS |
143 | |
144 | if (charpos < BUF_BEG (b) || charpos > BUF_Z (b)) | |
1088b922 | 145 | emacs_abort (); |
1389ad71 RS |
146 | |
147 | best_above = BUF_Z (b); | |
148 | best_above_byte = BUF_Z_BYTE (b); | |
149 | ||
150 | /* If this buffer has as many characters as bytes, | |
151 | each character must be one byte. | |
152 | This takes care of the case where enable-multibyte-characters is nil. */ | |
153 | if (best_above == best_above_byte) | |
154 | return charpos; | |
155 | ||
3ab364ce SM |
156 | best_below = BEG; |
157 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
158 | |
159 | /* We find in best_above and best_above_byte | |
160 | the closest known point above CHARPOS, | |
161 | and in best_below and best_below_byte | |
162 | the closest known point below CHARPOS, | |
163 | ||
164 | If at any point we can tell that the space between those | |
165 | two best approximations is all single-byte, | |
166 | we interpolate the result immediately. */ | |
167 | ||
168 | CONSIDER (BUF_PT (b), BUF_PT_BYTE (b)); | |
169 | CONSIDER (BUF_GPT (b), BUF_GPT_BYTE (b)); | |
170 | CONSIDER (BUF_BEGV (b), BUF_BEGV_BYTE (b)); | |
171 | CONSIDER (BUF_ZV (b), BUF_ZV_BYTE (b)); | |
172 | ||
173 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
174 | CONSIDER (cached_charpos, cached_bytepos); | |
175 | ||
5e097e00 | 176 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 177 | { |
5e097e00 | 178 | CONSIDER (tail->charpos, tail->bytepos); |
1389ad71 RS |
179 | |
180 | /* If we are down to a range of 50 chars, | |
181 | don't bother checking any other markers; | |
182 | scan the intervening chars directly now. */ | |
183 | if (best_above - best_below < 50) | |
184 | break; | |
1389ad71 RS |
185 | } |
186 | ||
187 | /* We get here if we did not exactly hit one of the known places. | |
188 | We have one known above and one known below. | |
189 | Scan, counting characters, from whichever one is closer. */ | |
190 | ||
191 | if (charpos - best_below < best_above - charpos) | |
192 | { | |
193 | int record = charpos - best_below > 5000; | |
194 | ||
195 | while (best_below != charpos) | |
196 | { | |
197 | best_below++; | |
198 | BUF_INC_POS (b, best_below_byte); | |
199 | } | |
200 | ||
201 | /* If this position is quite far from the nearest known position, | |
202 | cache the correspondence by creating a marker here. | |
203 | It will last until the next GC. */ | |
204 | if (record) | |
657924ff | 205 | build_marker (b, best_below, best_below_byte); |
1389ad71 | 206 | |
9d44f8ce | 207 | byte_char_debug_check (b, best_below, best_below_byte); |
6e57421b | 208 | |
1389ad71 RS |
209 | cached_buffer = b; |
210 | cached_modiff = BUF_MODIFF (b); | |
211 | cached_charpos = best_below; | |
212 | cached_bytepos = best_below_byte; | |
213 | ||
214 | return best_below_byte; | |
215 | } | |
216 | else | |
217 | { | |
218 | int record = best_above - charpos > 5000; | |
219 | ||
220 | while (best_above != charpos) | |
221 | { | |
222 | best_above--; | |
223 | BUF_DEC_POS (b, best_above_byte); | |
224 | } | |
225 | ||
226 | /* If this position is quite far from the nearest known position, | |
227 | cache the correspondence by creating a marker here. | |
228 | It will last until the next GC. */ | |
229 | if (record) | |
657924ff | 230 | build_marker (b, best_above, best_above_byte); |
1389ad71 | 231 | |
9d44f8ce | 232 | byte_char_debug_check (b, best_above, best_above_byte); |
6e57421b | 233 | |
1389ad71 RS |
234 | cached_buffer = b; |
235 | cached_modiff = BUF_MODIFF (b); | |
236 | cached_charpos = best_above; | |
237 | cached_bytepos = best_above_byte; | |
238 | ||
239 | return best_above_byte; | |
240 | } | |
241 | } | |
242 | ||
243 | #undef CONSIDER | |
55a91ea3 | 244 | |
b4c3046a PE |
245 | /* buf_bytepos_to_charpos returns the char position corresponding to |
246 | BYTEPOS. */ | |
1389ad71 | 247 | |
b4c3046a | 248 | /* This macro is a subroutine of buf_bytepos_to_charpos. |
1389ad71 RS |
249 | It is used when BYTEPOS is actually the byte position. */ |
250 | ||
251 | #define CONSIDER(BYTEPOS, CHARPOS) \ | |
252 | { \ | |
d311d28c | 253 | ptrdiff_t this_bytepos = (BYTEPOS); \ |
1389ad71 RS |
254 | int changed = 0; \ |
255 | \ | |
256 | if (this_bytepos == bytepos) \ | |
6e57421b | 257 | { \ |
d311d28c | 258 | ptrdiff_t value = (CHARPOS); \ |
90fc4786 DA |
259 | \ |
260 | byte_char_debug_check (b, value, bytepos); \ | |
6e57421b RS |
261 | return value; \ |
262 | } \ | |
1389ad71 RS |
263 | else if (this_bytepos > bytepos) \ |
264 | { \ | |
265 | if (this_bytepos < best_above_byte) \ | |
266 | { \ | |
267 | best_above = (CHARPOS); \ | |
268 | best_above_byte = this_bytepos; \ | |
269 | changed = 1; \ | |
270 | } \ | |
271 | } \ | |
272 | else if (this_bytepos > best_below_byte) \ | |
273 | { \ | |
274 | best_below = (CHARPOS); \ | |
275 | best_below_byte = this_bytepos; \ | |
276 | changed = 1; \ | |
277 | } \ | |
278 | \ | |
279 | if (changed) \ | |
280 | { \ | |
281 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 282 | { \ |
d311d28c | 283 | ptrdiff_t value = best_below + (bytepos - best_below_byte); \ |
90fc4786 DA |
284 | \ |
285 | byte_char_debug_check (b, value, bytepos); \ | |
6e57421b RS |
286 | return value; \ |
287 | } \ | |
1389ad71 RS |
288 | } \ |
289 | } | |
290 | ||
d311d28c PE |
291 | ptrdiff_t |
292 | buf_bytepos_to_charpos (struct buffer *b, ptrdiff_t bytepos) | |
1389ad71 | 293 | { |
5e097e00 | 294 | struct Lisp_Marker *tail; |
d311d28c PE |
295 | ptrdiff_t best_above, best_above_byte; |
296 | ptrdiff_t best_below, best_below_byte; | |
1389ad71 RS |
297 | |
298 | if (bytepos < BUF_BEG_BYTE (b) || bytepos > BUF_Z_BYTE (b)) | |
1088b922 | 299 | emacs_abort (); |
1389ad71 RS |
300 | |
301 | best_above = BUF_Z (b); | |
302 | best_above_byte = BUF_Z_BYTE (b); | |
303 | ||
304 | /* If this buffer has as many characters as bytes, | |
305 | each character must be one byte. | |
306 | This takes care of the case where enable-multibyte-characters is nil. */ | |
307 | if (best_above == best_above_byte) | |
308 | return bytepos; | |
309 | ||
3ab364ce SM |
310 | best_below = BEG; |
311 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
312 | |
313 | CONSIDER (BUF_PT_BYTE (b), BUF_PT (b)); | |
314 | CONSIDER (BUF_GPT_BYTE (b), BUF_GPT (b)); | |
315 | CONSIDER (BUF_BEGV_BYTE (b), BUF_BEGV (b)); | |
316 | CONSIDER (BUF_ZV_BYTE (b), BUF_ZV (b)); | |
317 | ||
318 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
319 | CONSIDER (cached_bytepos, cached_charpos); | |
320 | ||
5e097e00 | 321 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 322 | { |
5e097e00 | 323 | CONSIDER (tail->bytepos, tail->charpos); |
1389ad71 RS |
324 | |
325 | /* If we are down to a range of 50 chars, | |
326 | don't bother checking any other markers; | |
327 | scan the intervening chars directly now. */ | |
328 | if (best_above - best_below < 50) | |
329 | break; | |
1389ad71 RS |
330 | } |
331 | ||
332 | /* We get here if we did not exactly hit one of the known places. | |
333 | We have one known above and one known below. | |
334 | Scan, counting characters, from whichever one is closer. */ | |
335 | ||
336 | if (bytepos - best_below_byte < best_above_byte - bytepos) | |
337 | { | |
7693a579 | 338 | int record = bytepos - best_below_byte > 5000; |
1389ad71 RS |
339 | |
340 | while (best_below_byte < bytepos) | |
341 | { | |
342 | best_below++; | |
343 | BUF_INC_POS (b, best_below_byte); | |
344 | } | |
345 | ||
346 | /* If this position is quite far from the nearest known position, | |
347 | cache the correspondence by creating a marker here. | |
7693a579 RS |
348 | It will last until the next GC. |
349 | But don't do it if BUF_MARKERS is nil; | |
350 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 351 | if (record && BUF_MARKERS (b)) |
657924ff | 352 | build_marker (b, best_below, best_below_byte); |
1389ad71 | 353 | |
9d44f8ce | 354 | byte_char_debug_check (b, best_below, best_below_byte); |
6e57421b | 355 | |
1389ad71 RS |
356 | cached_buffer = b; |
357 | cached_modiff = BUF_MODIFF (b); | |
358 | cached_charpos = best_below; | |
359 | cached_bytepos = best_below_byte; | |
360 | ||
361 | return best_below; | |
362 | } | |
363 | else | |
364 | { | |
365 | int record = best_above_byte - bytepos > 5000; | |
366 | ||
367 | while (best_above_byte > bytepos) | |
368 | { | |
369 | best_above--; | |
370 | BUF_DEC_POS (b, best_above_byte); | |
371 | } | |
372 | ||
373 | /* If this position is quite far from the nearest known position, | |
374 | cache the correspondence by creating a marker here. | |
7693a579 RS |
375 | It will last until the next GC. |
376 | But don't do it if BUF_MARKERS is nil; | |
377 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 378 | if (record && BUF_MARKERS (b)) |
657924ff | 379 | build_marker (b, best_above, best_above_byte); |
1389ad71 | 380 | |
9d44f8ce | 381 | byte_char_debug_check (b, best_above, best_above_byte); |
6e57421b | 382 | |
1389ad71 RS |
383 | cached_buffer = b; |
384 | cached_modiff = BUF_MODIFF (b); | |
385 | cached_charpos = best_above; | |
386 | cached_bytepos = best_above_byte; | |
387 | ||
388 | return best_above; | |
389 | } | |
390 | } | |
391 | ||
392 | #undef CONSIDER | |
393 | \f | |
dcfdbac7 JB |
394 | /* Operations on markers. */ |
395 | ||
a7ca3326 | 396 | DEFUN ("marker-buffer", Fmarker_buffer, Smarker_buffer, 1, 1, 0, |
2e1280f8 PJ |
397 | doc: /* Return the buffer that MARKER points into, or nil if none. |
398 | Returns nil if MARKER points into a dead buffer. */) | |
5842a27b | 399 | (register Lisp_Object marker) |
dcfdbac7 JB |
400 | { |
401 | register Lisp_Object buf; | |
b7826503 | 402 | CHECK_MARKER (marker); |
dcfdbac7 JB |
403 | if (XMARKER (marker)->buffer) |
404 | { | |
0e11d869 | 405 | XSETBUFFER (buf, XMARKER (marker)->buffer); |
0754c46a SM |
406 | /* If the buffer is dead, we're in trouble: the buffer pointer here |
407 | does not preserve the buffer from being GC'd (it's weak), so | |
408 | markers have to be unlinked from their buffer as soon as the buffer | |
409 | is killed. */ | |
e578f381 | 410 | eassert (BUFFER_LIVE_P (XBUFFER (buf))); |
0754c46a | 411 | return buf; |
dcfdbac7 JB |
412 | } |
413 | return Qnil; | |
414 | } | |
415 | ||
a7ca3326 | 416 | DEFUN ("marker-position", Fmarker_position, Smarker_position, 1, 1, 0, |
243d70e5 JL |
417 | doc: /* Return the position MARKER points at, as a character number. |
418 | Returns nil if MARKER points nowhere. */) | |
5842a27b | 419 | (Lisp_Object marker) |
dcfdbac7 | 420 | { |
b7826503 | 421 | CHECK_MARKER (marker); |
dcfdbac7 | 422 | if (XMARKER (marker)->buffer) |
1389ad71 | 423 | return make_number (XMARKER (marker)->charpos); |
dcfdbac7 | 424 | |
dcfdbac7 JB |
425 | return Qnil; |
426 | } | |
4e57b342 DA |
427 | |
428 | /* Change M so it points to B at CHARPOS and BYTEPOS. */ | |
429 | ||
eeaea515 | 430 | static inline void |
4e57b342 DA |
431 | attach_marker (struct Lisp_Marker *m, struct buffer *b, |
432 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
433 | { | |
d36d71df DA |
434 | /* In a single-byte buffer, two positions must be equal. |
435 | Otherwise, every character is at least one byte. */ | |
436 | if (BUF_Z (b) == BUF_Z_BYTE (b)) | |
437 | eassert (charpos == bytepos); | |
438 | else | |
439 | eassert (charpos <= bytepos); | |
4e57b342 DA |
440 | |
441 | m->charpos = charpos; | |
442 | m->bytepos = bytepos; | |
443 | ||
444 | if (m->buffer != b) | |
445 | { | |
446 | unchain_marker (m); | |
447 | m->buffer = b; | |
448 | m->next = BUF_MARKERS (b); | |
449 | BUF_MARKERS (b) = m; | |
450 | } | |
451 | } | |
452 | ||
d36d71df DA |
453 | /* If BUFFER is nil, return current buffer pointer. Next, check |
454 | whether BUFFER is a buffer object and return buffer pointer | |
455 | corresponding to BUFFER if BUFFER is live, or NULL otherwise. */ | |
dcfdbac7 | 456 | |
d36d71df DA |
457 | static inline struct buffer * |
458 | live_buffer (Lisp_Object buffer) | |
459 | { | |
460 | struct buffer *b; | |
5e097e00 | 461 | |
d36d71df | 462 | if (NILP (buffer)) |
dcfdbac7 | 463 | { |
d36d71df | 464 | b = current_buffer; |
e578f381 | 465 | eassert (BUFFER_LIVE_P (b)); |
dcfdbac7 | 466 | } |
dcfdbac7 JB |
467 | else |
468 | { | |
b7826503 | 469 | CHECK_BUFFER (buffer); |
dcfdbac7 | 470 | b = XBUFFER (buffer); |
e578f381 | 471 | if (!BUFFER_LIVE_P (b)) |
d36d71df | 472 | b = NULL; |
1389ad71 | 473 | } |
d36d71df | 474 | return b; |
dcfdbac7 JB |
475 | } |
476 | ||
d36d71df DA |
477 | /* Internal function to set MARKER in BUFFER at POSITION. Non-zero |
478 | RESTRICTED means limit the POSITION by the visible part of BUFFER. */ | |
dcfdbac7 | 479 | |
d36d71df DA |
480 | static inline Lisp_Object |
481 | set_marker_internal (Lisp_Object marker, Lisp_Object position, | |
482 | Lisp_Object buffer, int restricted) | |
dcfdbac7 | 483 | { |
dcfdbac7 | 484 | register struct Lisp_Marker *m; |
d36d71df | 485 | register struct buffer *b = live_buffer (buffer); |
dcfdbac7 | 486 | |
b7826503 | 487 | CHECK_MARKER (marker); |
5e097e00 SM |
488 | m = XMARKER (marker); |
489 | ||
d36d71df DA |
490 | /* Set MARKER to point nowhere if BUFFER is dead, or |
491 | POSITION is nil or a marker points to nowhere. */ | |
492 | if (NILP (position) | |
493 | || (MARKERP (position) && !XMARKER (position)->buffer) | |
494 | || !b) | |
495 | unchain_marker (m); | |
496 | ||
497 | /* Optimize the special case where we are copying the position of | |
498 | an existing marker, and MARKER is already in the same buffer. */ | |
499 | else if (MARKERP (position) && b == XMARKER (position)->buffer | |
500 | && b == m->buffer) | |
dcfdbac7 | 501 | { |
d36d71df DA |
502 | m->bytepos = XMARKER (position)->bytepos; |
503 | m->charpos = XMARKER (position)->charpos; | |
dcfdbac7 JB |
504 | } |
505 | ||
dcfdbac7 JB |
506 | else |
507 | { | |
d36d71df | 508 | register ptrdiff_t charpos, bytepos; |
1088b922 | 509 | |
d36d71df DA |
510 | CHECK_NUMBER_COERCE_MARKER (position); |
511 | charpos = clip_to_bounds (restricted ? BUF_BEGV (b) : BUF_BEG (b), | |
512 | XINT (position), | |
513 | restricted ? BUF_ZV (b) : BUF_Z (b)); | |
514 | bytepos = buf_charpos_to_bytepos (b, charpos); | |
515 | attach_marker (m, b, charpos, bytepos); | |
dcfdbac7 | 516 | } |
d36d71df DA |
517 | return marker; |
518 | } | |
dcfdbac7 | 519 | |
d36d71df DA |
520 | DEFUN ("set-marker", Fset_marker, Sset_marker, 2, 3, 0, |
521 | doc: /* Position MARKER before character number POSITION in BUFFER, | |
522 | which defaults to the current buffer. If POSITION is nil, | |
523 | makes marker point nowhere so it no longer slows down | |
524 | editing in any buffer. Returns MARKER. */) | |
525 | (Lisp_Object marker, Lisp_Object position, Lisp_Object buffer) | |
526 | { | |
527 | return set_marker_internal (marker, position, buffer, 0); | |
528 | } | |
1389ad71 | 529 | |
d36d71df | 530 | /* Like the above, but won't let the position be outside the visible part. */ |
177c0ea7 | 531 | |
d36d71df DA |
532 | Lisp_Object |
533 | set_marker_restricted (Lisp_Object marker, Lisp_Object position, | |
534 | Lisp_Object buffer) | |
535 | { | |
536 | return set_marker_internal (marker, position, buffer, 1); | |
dcfdbac7 | 537 | } |
d36d71df | 538 | |
1389ad71 RS |
539 | /* Set the position of MARKER, specifying both the |
540 | character position and the corresponding byte position. */ | |
dcfdbac7 | 541 | |
177c0ea7 | 542 | Lisp_Object |
d36d71df DA |
543 | set_marker_both (Lisp_Object marker, Lisp_Object buffer, |
544 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
1389ad71 | 545 | { |
1389ad71 | 546 | register struct Lisp_Marker *m; |
d36d71df | 547 | register struct buffer *b = live_buffer (buffer); |
1389ad71 | 548 | |
b7826503 | 549 | CHECK_MARKER (marker); |
5e097e00 | 550 | m = XMARKER (marker); |
1389ad71 | 551 | |
d36d71df DA |
552 | if (b) |
553 | attach_marker (m, b, charpos, bytepos); | |
1389ad71 | 554 | else |
d36d71df | 555 | unchain_marker (m); |
1389ad71 RS |
556 | return marker; |
557 | } | |
558 | ||
d36d71df | 559 | /* Like the above, but won't let the position be outside the visible part. */ |
1389ad71 | 560 | |
177c0ea7 | 561 | Lisp_Object |
d36d71df DA |
562 | set_marker_restricted_both (Lisp_Object marker, Lisp_Object buffer, |
563 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
1389ad71 | 564 | { |
1389ad71 | 565 | register struct Lisp_Marker *m; |
d36d71df | 566 | register struct buffer *b = live_buffer (buffer); |
1389ad71 | 567 | |
b7826503 | 568 | CHECK_MARKER (marker); |
5e097e00 | 569 | m = XMARKER (marker); |
1389ad71 | 570 | |
d36d71df | 571 | if (b) |
1389ad71 | 572 | { |
1088b922 PE |
573 | attach_marker |
574 | (m, b, | |
d36d71df DA |
575 | clip_to_bounds (BUF_BEGV (b), charpos, BUF_ZV (b)), |
576 | clip_to_bounds (BUF_BEGV_BYTE (b), bytepos, BUF_ZV_BYTE (b))); | |
1389ad71 | 577 | } |
d36d71df DA |
578 | else |
579 | unchain_marker (m); | |
1389ad71 RS |
580 | return marker; |
581 | } | |
d36d71df | 582 | |
7b7ae965 DA |
583 | /* Remove MARKER from the chain of whatever buffer it is in, |
584 | leaving it points to nowhere. This is called during garbage | |
585 | collection, so we must be careful to ignore and preserve | |
586 | mark bits, including those in chain fields of markers. */ | |
dcfdbac7 | 587 | |
c0323249 | 588 | void |
971de7fb | 589 | unchain_marker (register struct Lisp_Marker *marker) |
dcfdbac7 | 590 | { |
7b7ae965 | 591 | register struct buffer *b = marker->buffer; |
dcfdbac7 | 592 | |
7b7ae965 | 593 | if (b) |
dcfdbac7 | 594 | { |
7b7ae965 DA |
595 | register struct Lisp_Marker *tail, **prev; |
596 | ||
597 | /* No dead buffers here. */ | |
e578f381 | 598 | eassert (BUFFER_LIVE_P (b)); |
7b7ae965 DA |
599 | |
600 | marker->buffer = NULL; | |
601 | prev = &BUF_MARKERS (b); | |
602 | ||
603 | for (tail = BUF_MARKERS (b); tail; prev = &tail->next, tail = *prev) | |
604 | if (marker == tail) | |
605 | { | |
606 | if (*prev == BUF_MARKERS (b)) | |
607 | { | |
1088b922 | 608 | /* Deleting first marker from the buffer's chain. Crash |
7b7ae965 DA |
609 | if new first marker in chain does not say it belongs |
610 | to the same buffer, or at least that they have the same | |
611 | base buffer. */ | |
612 | if (tail->next && b->text != tail->next->buffer->text) | |
1088b922 | 613 | emacs_abort (); |
7b7ae965 DA |
614 | } |
615 | *prev = tail->next; | |
616 | /* We have removed the marker from the chain; | |
617 | no need to scan the rest of the chain. */ | |
618 | break; | |
619 | } | |
620 | ||
621 | /* Error if marker was not in it's chain. */ | |
622 | eassert (tail != NULL); | |
dcfdbac7 | 623 | } |
dcfdbac7 JB |
624 | } |
625 | ||
1389ad71 | 626 | /* Return the char position of marker MARKER, as a C integer. */ |
d281a86a | 627 | |
d311d28c | 628 | ptrdiff_t |
971de7fb | 629 | marker_position (Lisp_Object marker) |
dcfdbac7 JB |
630 | { |
631 | register struct Lisp_Marker *m = XMARKER (marker); | |
632 | register struct buffer *buf = m->buffer; | |
1389ad71 RS |
633 | |
634 | if (!buf) | |
635 | error ("Marker does not point anywhere"); | |
636 | ||
4e57b342 DA |
637 | eassert (BUF_BEG (buf) <= m->charpos && m->charpos <= BUF_Z (buf)); |
638 | ||
1389ad71 RS |
639 | return m->charpos; |
640 | } | |
641 | ||
642 | /* Return the byte position of marker MARKER, as a C integer. */ | |
643 | ||
d311d28c | 644 | ptrdiff_t |
971de7fb | 645 | marker_byte_position (Lisp_Object marker) |
1389ad71 RS |
646 | { |
647 | register struct Lisp_Marker *m = XMARKER (marker); | |
648 | register struct buffer *buf = m->buffer; | |
dcfdbac7 JB |
649 | |
650 | if (!buf) | |
651 | error ("Marker does not point anywhere"); | |
652 | ||
4e57b342 | 653 | eassert (BUF_BEG_BYTE (buf) <= m->bytepos && m->bytepos <= BUF_Z_BYTE (buf)); |
dcfdbac7 | 654 | |
4e57b342 | 655 | return m->bytepos; |
dcfdbac7 | 656 | } |
fc299663 | 657 | \f |
a7ca3326 | 658 | DEFUN ("copy-marker", Fcopy_marker, Scopy_marker, 0, 2, 0, |
2e1280f8 PJ |
659 | doc: /* Return a new marker pointing at the same place as MARKER. |
660 | If argument is a number, makes a new marker pointing | |
661 | at that position in the current buffer. | |
cd196f12 | 662 | If MARKER is not specified, the new marker does not point anywhere. |
2e1280f8 PJ |
663 | The optional argument TYPE specifies the insertion type of the new marker; |
664 | see `marker-insertion-type'. */) | |
5842a27b | 665 | (register Lisp_Object marker, Lisp_Object type) |
dcfdbac7 JB |
666 | { |
667 | register Lisp_Object new; | |
668 | ||
cd196f12 | 669 | if (!NILP (marker)) |
0b4331b7 | 670 | CHECK_TYPE (INTEGERP (marker) || MARKERP (marker), Qinteger_or_marker_p, marker); |
0469366f KH |
671 | |
672 | new = Fmake_marker (); | |
673 | Fset_marker (new, marker, | |
674 | (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil)); | |
675 | XMARKER (new)->insertion_type = !NILP (type); | |
676 | return new; | |
fc299663 RS |
677 | } |
678 | ||
679 | DEFUN ("marker-insertion-type", Fmarker_insertion_type, | |
680 | Smarker_insertion_type, 1, 1, 0, | |
2e1280f8 | 681 | doc: /* Return insertion type of MARKER: t if it stays after inserted text. |
1961ac0f | 682 | The value nil means the marker stays before text inserted there. */) |
5842a27b | 683 | (register Lisp_Object marker) |
fc299663 | 684 | { |
b7826503 | 685 | CHECK_MARKER (marker); |
fc299663 RS |
686 | return XMARKER (marker)->insertion_type ? Qt : Qnil; |
687 | } | |
688 | ||
689 | DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type, | |
690 | Sset_marker_insertion_type, 2, 2, 0, | |
2e1280f8 PJ |
691 | doc: /* Set the insertion-type of MARKER to TYPE. |
692 | If TYPE is t, it means the marker advances when you insert text at it. | |
693 | If TYPE is nil, it means the marker stays behind when you insert text at it. */) | |
5842a27b | 694 | (Lisp_Object marker, Lisp_Object type) |
fc299663 | 695 | { |
b7826503 | 696 | CHECK_MARKER (marker); |
fc299663 RS |
697 | |
698 | XMARKER (marker)->insertion_type = ! NILP (type); | |
699 | return type; | |
dcfdbac7 | 700 | } |
9e5896c6 RS |
701 | |
702 | DEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, Sbuffer_has_markers_at, | |
2e1280f8 PJ |
703 | 1, 1, 0, |
704 | doc: /* Return t if there are markers pointing at POSITION in the current buffer. */) | |
5842a27b | 705 | (Lisp_Object position) |
9e5896c6 | 706 | { |
5e097e00 | 707 | register struct Lisp_Marker *tail; |
4e57b342 | 708 | register ptrdiff_t charpos; |
9e5896c6 | 709 | |
4e57b342 | 710 | charpos = clip_to_bounds (BEG, XINT (position), Z); |
9e5896c6 | 711 | |
5e097e00 | 712 | for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next) |
4e57b342 | 713 | if (tail->charpos == charpos) |
9e5896c6 RS |
714 | return Qt; |
715 | ||
716 | return Qnil; | |
717 | } | |
59d36066 | 718 | |
f1f924b6 | 719 | #ifdef MARKER_DEBUG |
90fc4786 | 720 | |
59d36066 RS |
721 | /* For debugging -- count the markers in buffer BUF. */ |
722 | ||
723 | int | |
971de7fb | 724 | count_markers (struct buffer *buf) |
59d36066 RS |
725 | { |
726 | int total = 0; | |
5e097e00 | 727 | struct Lisp_Marker *tail; |
59d36066 | 728 | |
5e097e00 | 729 | for (tail = BUF_MARKERS (buf); tail; tail = tail->next) |
59d36066 RS |
730 | total++; |
731 | ||
732 | return total; | |
733 | } | |
90fc4786 | 734 | |
f1f924b6 DA |
735 | /* For debugging -- recompute the bytepos corresponding |
736 | to CHARPOS in the simplest, most reliable way. */ | |
737 | ||
738 | ptrdiff_t | |
739 | verify_bytepos (ptrdiff_t charpos) | |
740 | { | |
741 | ptrdiff_t below = 1; | |
742 | ptrdiff_t below_byte = 1; | |
743 | ||
744 | while (below != charpos) | |
745 | { | |
746 | below++; | |
747 | BUF_INC_POS (current_buffer, below_byte); | |
748 | } | |
749 | ||
750 | return below_byte; | |
751 | } | |
752 | ||
753 | #endif /* MARKER_DEBUG */ | |
dcfdbac7 | 754 | \f |
c0323249 | 755 | void |
971de7fb | 756 | syms_of_marker (void) |
dcfdbac7 JB |
757 | { |
758 | defsubr (&Smarker_position); | |
759 | defsubr (&Smarker_buffer); | |
760 | defsubr (&Sset_marker); | |
761 | defsubr (&Scopy_marker); | |
fc299663 RS |
762 | defsubr (&Smarker_insertion_type); |
763 | defsubr (&Sset_marker_insertion_type); | |
9e5896c6 | 764 | defsubr (&Sbuffer_has_markers_at); |
dcfdbac7 | 765 | } |