Commit | Line | Data |
---|---|---|
1389ad71 | 1 | /* Markers: examining, setting and deleting. |
ab422c4d PE |
2 | Copyright (C) 1985, 1997-1998, 2001-2013 Free Software Foundation, |
3 | Inc. | |
dcfdbac7 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
dcfdbac7 | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
dcfdbac7 JB |
11 | |
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
dcfdbac7 JB |
19 | |
20 | ||
18160b98 | 21 | #include <config.h> |
0328b6de | 22 | |
dcfdbac7 | 23 | #include "lisp.h" |
83be827a | 24 | #include "character.h" |
e5560ff7 | 25 | #include "buffer.h" |
dcfdbac7 | 26 | |
1389ad71 RS |
27 | /* Record one cached position found recently by |
28 | buf_charpos_to_bytepos or buf_bytepos_to_charpos. */ | |
29 | ||
d311d28c PE |
30 | static ptrdiff_t cached_charpos; |
31 | static ptrdiff_t cached_bytepos; | |
1389ad71 | 32 | static struct buffer *cached_buffer; |
fd2f90cf | 33 | static EMACS_INT cached_modiff; |
31f8ab72 | 34 | |
f1f924b6 DA |
35 | /* Juanma Barranquero <lekktu@gmail.com> reported ~3x increased |
36 | bootstrap time when byte_char_debug_check is enabled; so this | |
37 | is never turned on by --enable-checking configure option. */ | |
38 | ||
39 | #ifdef MARKER_DEBUG | |
80d26f99 | 40 | |
90fc4786 | 41 | extern int count_markers (struct buffer *) EXTERNALLY_VISIBLE; |
f1f924b6 | 42 | extern ptrdiff_t verify_bytepos (ptrdiff_t charpos) EXTERNALLY_VISIBLE; |
90fc4786 DA |
43 | |
44 | static void | |
45 | byte_char_debug_check (struct buffer *b, ptrdiff_t charpos, ptrdiff_t bytepos) | |
46 | { | |
9d44f8ce DA |
47 | ptrdiff_t nchars; |
48 | ||
49 | if (NILP (BVAR (b, enable_multibyte_characters))) | |
50 | return; | |
90fc4786 DA |
51 | |
52 | if (bytepos > BUF_GPT_BYTE (b)) | |
9d44f8ce DA |
53 | nchars |
54 | = multibyte_chars_in_text (BUF_BEG_ADDR (b), | |
55 | BUF_GPT_BYTE (b) - BUF_BEG_BYTE (b)) | |
56 | + multibyte_chars_in_text (BUF_GAP_END_ADDR (b), | |
57 | bytepos - BUF_GPT_BYTE (b)); | |
90fc4786 DA |
58 | else |
59 | nchars = multibyte_chars_in_text (BUF_BEG_ADDR (b), | |
60 | bytepos - BUF_BEG_BYTE (b)); | |
61 | ||
62 | if (charpos - 1 != nchars) | |
1088b922 | 63 | emacs_abort (); |
90fc4786 DA |
64 | } |
65 | ||
f1f924b6 | 66 | #else /* not MARKER_DEBUG */ |
90fc4786 | 67 | |
e2688e4a | 68 | #define byte_char_debug_check(b, charpos, bytepos) do { } while (0) |
90fc4786 | 69 | |
f1f924b6 | 70 | #endif /* MARKER_DEBUG */ |
1088b922 | 71 | |
dfcf069d | 72 | void |
971de7fb | 73 | clear_charpos_cache (struct buffer *b) |
31f8ab72 RS |
74 | { |
75 | if (cached_buffer == b) | |
76 | cached_buffer = 0; | |
77 | } | |
1389ad71 RS |
78 | \f |
79 | /* Converting between character positions and byte positions. */ | |
80 | ||
81 | /* There are several places in the buffer where we know | |
3f67ae94 | 82 | the correspondence: BEG, BEGV, PT, GPT, ZV and Z, |
1389ad71 RS |
83 | and everywhere there is a marker. So we find the one of these places |
84 | that is closest to the specified position, and scan from there. */ | |
85 | ||
86 | /* charpos_to_bytepos returns the byte position corresponding to CHARPOS. */ | |
87 | ||
88 | /* This macro is a subroutine of charpos_to_bytepos. | |
89 | Note that it is desirable that BYTEPOS is not evaluated | |
90 | except when we really want its value. */ | |
91 | ||
92 | #define CONSIDER(CHARPOS, BYTEPOS) \ | |
93 | { \ | |
d311d28c | 94 | ptrdiff_t this_charpos = (CHARPOS); \ |
7cded46f | 95 | bool changed = 0; \ |
1389ad71 RS |
96 | \ |
97 | if (this_charpos == charpos) \ | |
6e57421b | 98 | { \ |
d311d28c | 99 | ptrdiff_t value = (BYTEPOS); \ |
90fc4786 DA |
100 | \ |
101 | byte_char_debug_check (b, charpos, value); \ | |
6e57421b RS |
102 | return value; \ |
103 | } \ | |
1389ad71 RS |
104 | else if (this_charpos > charpos) \ |
105 | { \ | |
106 | if (this_charpos < best_above) \ | |
107 | { \ | |
108 | best_above = this_charpos; \ | |
109 | best_above_byte = (BYTEPOS); \ | |
110 | changed = 1; \ | |
111 | } \ | |
112 | } \ | |
113 | else if (this_charpos > best_below) \ | |
114 | { \ | |
115 | best_below = this_charpos; \ | |
116 | best_below_byte = (BYTEPOS); \ | |
117 | changed = 1; \ | |
118 | } \ | |
119 | \ | |
120 | if (changed) \ | |
121 | { \ | |
122 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 123 | { \ |
d311d28c | 124 | ptrdiff_t value = best_below_byte + (charpos - best_below); \ |
90fc4786 DA |
125 | \ |
126 | byte_char_debug_check (b, charpos, value); \ | |
6e57421b RS |
127 | return value; \ |
128 | } \ | |
1389ad71 RS |
129 | } \ |
130 | } | |
131 | ||
d311d28c PE |
132 | ptrdiff_t |
133 | charpos_to_bytepos (ptrdiff_t charpos) | |
1389ad71 RS |
134 | { |
135 | return buf_charpos_to_bytepos (current_buffer, charpos); | |
136 | } | |
137 | ||
d311d28c PE |
138 | ptrdiff_t |
139 | buf_charpos_to_bytepos (struct buffer *b, ptrdiff_t charpos) | |
1389ad71 | 140 | { |
5e097e00 | 141 | struct Lisp_Marker *tail; |
d311d28c PE |
142 | ptrdiff_t best_above, best_above_byte; |
143 | ptrdiff_t best_below, best_below_byte; | |
1389ad71 RS |
144 | |
145 | if (charpos < BUF_BEG (b) || charpos > BUF_Z (b)) | |
1088b922 | 146 | emacs_abort (); |
1389ad71 RS |
147 | |
148 | best_above = BUF_Z (b); | |
149 | best_above_byte = BUF_Z_BYTE (b); | |
150 | ||
151 | /* If this buffer has as many characters as bytes, | |
152 | each character must be one byte. | |
153 | This takes care of the case where enable-multibyte-characters is nil. */ | |
154 | if (best_above == best_above_byte) | |
155 | return charpos; | |
156 | ||
3ab364ce SM |
157 | best_below = BEG; |
158 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
159 | |
160 | /* We find in best_above and best_above_byte | |
161 | the closest known point above CHARPOS, | |
162 | and in best_below and best_below_byte | |
163 | the closest known point below CHARPOS, | |
164 | ||
165 | If at any point we can tell that the space between those | |
166 | two best approximations is all single-byte, | |
167 | we interpolate the result immediately. */ | |
168 | ||
169 | CONSIDER (BUF_PT (b), BUF_PT_BYTE (b)); | |
170 | CONSIDER (BUF_GPT (b), BUF_GPT_BYTE (b)); | |
171 | CONSIDER (BUF_BEGV (b), BUF_BEGV_BYTE (b)); | |
172 | CONSIDER (BUF_ZV (b), BUF_ZV_BYTE (b)); | |
173 | ||
174 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
175 | CONSIDER (cached_charpos, cached_bytepos); | |
176 | ||
5e097e00 | 177 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 178 | { |
5e097e00 | 179 | CONSIDER (tail->charpos, tail->bytepos); |
1389ad71 RS |
180 | |
181 | /* If we are down to a range of 50 chars, | |
182 | don't bother checking any other markers; | |
183 | scan the intervening chars directly now. */ | |
184 | if (best_above - best_below < 50) | |
185 | break; | |
1389ad71 RS |
186 | } |
187 | ||
188 | /* We get here if we did not exactly hit one of the known places. | |
189 | We have one known above and one known below. | |
190 | Scan, counting characters, from whichever one is closer. */ | |
191 | ||
192 | if (charpos - best_below < best_above - charpos) | |
193 | { | |
7cded46f | 194 | bool record = charpos - best_below > 5000; |
1389ad71 RS |
195 | |
196 | while (best_below != charpos) | |
197 | { | |
198 | best_below++; | |
199 | BUF_INC_POS (b, best_below_byte); | |
200 | } | |
201 | ||
202 | /* If this position is quite far from the nearest known position, | |
203 | cache the correspondence by creating a marker here. | |
204 | It will last until the next GC. */ | |
205 | if (record) | |
657924ff | 206 | build_marker (b, best_below, best_below_byte); |
1389ad71 | 207 | |
9d44f8ce | 208 | byte_char_debug_check (b, best_below, best_below_byte); |
6e57421b | 209 | |
1389ad71 RS |
210 | cached_buffer = b; |
211 | cached_modiff = BUF_MODIFF (b); | |
212 | cached_charpos = best_below; | |
213 | cached_bytepos = best_below_byte; | |
214 | ||
215 | return best_below_byte; | |
216 | } | |
217 | else | |
218 | { | |
7cded46f | 219 | bool record = best_above - charpos > 5000; |
1389ad71 RS |
220 | |
221 | while (best_above != charpos) | |
222 | { | |
223 | best_above--; | |
224 | BUF_DEC_POS (b, best_above_byte); | |
225 | } | |
226 | ||
227 | /* If this position is quite far from the nearest known position, | |
228 | cache the correspondence by creating a marker here. | |
229 | It will last until the next GC. */ | |
230 | if (record) | |
657924ff | 231 | build_marker (b, best_above, best_above_byte); |
1389ad71 | 232 | |
9d44f8ce | 233 | byte_char_debug_check (b, best_above, best_above_byte); |
6e57421b | 234 | |
1389ad71 RS |
235 | cached_buffer = b; |
236 | cached_modiff = BUF_MODIFF (b); | |
237 | cached_charpos = best_above; | |
238 | cached_bytepos = best_above_byte; | |
239 | ||
240 | return best_above_byte; | |
241 | } | |
242 | } | |
243 | ||
244 | #undef CONSIDER | |
55a91ea3 | 245 | |
b4c3046a PE |
246 | /* buf_bytepos_to_charpos returns the char position corresponding to |
247 | BYTEPOS. */ | |
1389ad71 | 248 | |
b4c3046a | 249 | /* This macro is a subroutine of buf_bytepos_to_charpos. |
1389ad71 RS |
250 | It is used when BYTEPOS is actually the byte position. */ |
251 | ||
252 | #define CONSIDER(BYTEPOS, CHARPOS) \ | |
253 | { \ | |
d311d28c | 254 | ptrdiff_t this_bytepos = (BYTEPOS); \ |
1389ad71 RS |
255 | int changed = 0; \ |
256 | \ | |
257 | if (this_bytepos == bytepos) \ | |
6e57421b | 258 | { \ |
d311d28c | 259 | ptrdiff_t value = (CHARPOS); \ |
90fc4786 DA |
260 | \ |
261 | byte_char_debug_check (b, value, bytepos); \ | |
6e57421b RS |
262 | return value; \ |
263 | } \ | |
1389ad71 RS |
264 | else if (this_bytepos > bytepos) \ |
265 | { \ | |
266 | if (this_bytepos < best_above_byte) \ | |
267 | { \ | |
268 | best_above = (CHARPOS); \ | |
269 | best_above_byte = this_bytepos; \ | |
270 | changed = 1; \ | |
271 | } \ | |
272 | } \ | |
273 | else if (this_bytepos > best_below_byte) \ | |
274 | { \ | |
275 | best_below = (CHARPOS); \ | |
276 | best_below_byte = this_bytepos; \ | |
277 | changed = 1; \ | |
278 | } \ | |
279 | \ | |
280 | if (changed) \ | |
281 | { \ | |
282 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 283 | { \ |
d311d28c | 284 | ptrdiff_t value = best_below + (bytepos - best_below_byte); \ |
90fc4786 DA |
285 | \ |
286 | byte_char_debug_check (b, value, bytepos); \ | |
6e57421b RS |
287 | return value; \ |
288 | } \ | |
1389ad71 RS |
289 | } \ |
290 | } | |
291 | ||
d311d28c PE |
292 | ptrdiff_t |
293 | buf_bytepos_to_charpos (struct buffer *b, ptrdiff_t bytepos) | |
1389ad71 | 294 | { |
5e097e00 | 295 | struct Lisp_Marker *tail; |
d311d28c PE |
296 | ptrdiff_t best_above, best_above_byte; |
297 | ptrdiff_t best_below, best_below_byte; | |
1389ad71 RS |
298 | |
299 | if (bytepos < BUF_BEG_BYTE (b) || bytepos > BUF_Z_BYTE (b)) | |
1088b922 | 300 | emacs_abort (); |
1389ad71 RS |
301 | |
302 | best_above = BUF_Z (b); | |
303 | best_above_byte = BUF_Z_BYTE (b); | |
304 | ||
305 | /* If this buffer has as many characters as bytes, | |
306 | each character must be one byte. | |
307 | This takes care of the case where enable-multibyte-characters is nil. */ | |
308 | if (best_above == best_above_byte) | |
309 | return bytepos; | |
310 | ||
3ab364ce SM |
311 | best_below = BEG; |
312 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
313 | |
314 | CONSIDER (BUF_PT_BYTE (b), BUF_PT (b)); | |
315 | CONSIDER (BUF_GPT_BYTE (b), BUF_GPT (b)); | |
316 | CONSIDER (BUF_BEGV_BYTE (b), BUF_BEGV (b)); | |
317 | CONSIDER (BUF_ZV_BYTE (b), BUF_ZV (b)); | |
318 | ||
319 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
320 | CONSIDER (cached_bytepos, cached_charpos); | |
321 | ||
5e097e00 | 322 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 323 | { |
5e097e00 | 324 | CONSIDER (tail->bytepos, tail->charpos); |
1389ad71 RS |
325 | |
326 | /* If we are down to a range of 50 chars, | |
327 | don't bother checking any other markers; | |
328 | scan the intervening chars directly now. */ | |
329 | if (best_above - best_below < 50) | |
330 | break; | |
1389ad71 RS |
331 | } |
332 | ||
333 | /* We get here if we did not exactly hit one of the known places. | |
334 | We have one known above and one known below. | |
335 | Scan, counting characters, from whichever one is closer. */ | |
336 | ||
337 | if (bytepos - best_below_byte < best_above_byte - bytepos) | |
338 | { | |
7cded46f | 339 | bool record = bytepos - best_below_byte > 5000; |
1389ad71 RS |
340 | |
341 | while (best_below_byte < bytepos) | |
342 | { | |
343 | best_below++; | |
344 | BUF_INC_POS (b, best_below_byte); | |
345 | } | |
346 | ||
347 | /* If this position is quite far from the nearest known position, | |
348 | cache the correspondence by creating a marker here. | |
7693a579 RS |
349 | It will last until the next GC. |
350 | But don't do it if BUF_MARKERS is nil; | |
351 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 352 | if (record && BUF_MARKERS (b)) |
657924ff | 353 | build_marker (b, best_below, best_below_byte); |
1389ad71 | 354 | |
9d44f8ce | 355 | byte_char_debug_check (b, best_below, best_below_byte); |
6e57421b | 356 | |
1389ad71 RS |
357 | cached_buffer = b; |
358 | cached_modiff = BUF_MODIFF (b); | |
359 | cached_charpos = best_below; | |
360 | cached_bytepos = best_below_byte; | |
361 | ||
362 | return best_below; | |
363 | } | |
364 | else | |
365 | { | |
7cded46f | 366 | bool record = best_above_byte - bytepos > 5000; |
1389ad71 RS |
367 | |
368 | while (best_above_byte > bytepos) | |
369 | { | |
370 | best_above--; | |
371 | BUF_DEC_POS (b, best_above_byte); | |
372 | } | |
373 | ||
374 | /* If this position is quite far from the nearest known position, | |
375 | cache the correspondence by creating a marker here. | |
7693a579 RS |
376 | It will last until the next GC. |
377 | But don't do it if BUF_MARKERS is nil; | |
378 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 379 | if (record && BUF_MARKERS (b)) |
657924ff | 380 | build_marker (b, best_above, best_above_byte); |
1389ad71 | 381 | |
9d44f8ce | 382 | byte_char_debug_check (b, best_above, best_above_byte); |
6e57421b | 383 | |
1389ad71 RS |
384 | cached_buffer = b; |
385 | cached_modiff = BUF_MODIFF (b); | |
386 | cached_charpos = best_above; | |
387 | cached_bytepos = best_above_byte; | |
388 | ||
389 | return best_above; | |
390 | } | |
391 | } | |
392 | ||
393 | #undef CONSIDER | |
394 | \f | |
dcfdbac7 JB |
395 | /* Operations on markers. */ |
396 | ||
a7ca3326 | 397 | DEFUN ("marker-buffer", Fmarker_buffer, Smarker_buffer, 1, 1, 0, |
2e1280f8 PJ |
398 | doc: /* Return the buffer that MARKER points into, or nil if none. |
399 | Returns nil if MARKER points into a dead buffer. */) | |
5842a27b | 400 | (register Lisp_Object marker) |
dcfdbac7 JB |
401 | { |
402 | register Lisp_Object buf; | |
b7826503 | 403 | CHECK_MARKER (marker); |
dcfdbac7 JB |
404 | if (XMARKER (marker)->buffer) |
405 | { | |
0e11d869 | 406 | XSETBUFFER (buf, XMARKER (marker)->buffer); |
0754c46a SM |
407 | /* If the buffer is dead, we're in trouble: the buffer pointer here |
408 | does not preserve the buffer from being GC'd (it's weak), so | |
409 | markers have to be unlinked from their buffer as soon as the buffer | |
410 | is killed. */ | |
e578f381 | 411 | eassert (BUFFER_LIVE_P (XBUFFER (buf))); |
0754c46a | 412 | return buf; |
dcfdbac7 JB |
413 | } |
414 | return Qnil; | |
415 | } | |
416 | ||
a7ca3326 | 417 | DEFUN ("marker-position", Fmarker_position, Smarker_position, 1, 1, 0, |
243d70e5 JL |
418 | doc: /* Return the position MARKER points at, as a character number. |
419 | Returns nil if MARKER points nowhere. */) | |
5842a27b | 420 | (Lisp_Object marker) |
dcfdbac7 | 421 | { |
b7826503 | 422 | CHECK_MARKER (marker); |
dcfdbac7 | 423 | if (XMARKER (marker)->buffer) |
1389ad71 | 424 | return make_number (XMARKER (marker)->charpos); |
dcfdbac7 | 425 | |
dcfdbac7 JB |
426 | return Qnil; |
427 | } | |
4e57b342 DA |
428 | |
429 | /* Change M so it points to B at CHARPOS and BYTEPOS. */ | |
430 | ||
b0ab8123 | 431 | static void |
4e57b342 DA |
432 | attach_marker (struct Lisp_Marker *m, struct buffer *b, |
433 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
434 | { | |
d36d71df DA |
435 | /* In a single-byte buffer, two positions must be equal. |
436 | Otherwise, every character is at least one byte. */ | |
437 | if (BUF_Z (b) == BUF_Z_BYTE (b)) | |
438 | eassert (charpos == bytepos); | |
439 | else | |
440 | eassert (charpos <= bytepos); | |
4e57b342 DA |
441 | |
442 | m->charpos = charpos; | |
443 | m->bytepos = bytepos; | |
444 | ||
445 | if (m->buffer != b) | |
446 | { | |
447 | unchain_marker (m); | |
448 | m->buffer = b; | |
449 | m->next = BUF_MARKERS (b); | |
450 | BUF_MARKERS (b) = m; | |
451 | } | |
452 | } | |
453 | ||
d36d71df DA |
454 | /* If BUFFER is nil, return current buffer pointer. Next, check |
455 | whether BUFFER is a buffer object and return buffer pointer | |
456 | corresponding to BUFFER if BUFFER is live, or NULL otherwise. */ | |
dcfdbac7 | 457 | |
b0ab8123 | 458 | static struct buffer * |
d36d71df DA |
459 | live_buffer (Lisp_Object buffer) |
460 | { | |
461 | struct buffer *b; | |
5e097e00 | 462 | |
d36d71df | 463 | if (NILP (buffer)) |
dcfdbac7 | 464 | { |
d36d71df | 465 | b = current_buffer; |
e578f381 | 466 | eassert (BUFFER_LIVE_P (b)); |
dcfdbac7 | 467 | } |
dcfdbac7 JB |
468 | else |
469 | { | |
b7826503 | 470 | CHECK_BUFFER (buffer); |
dcfdbac7 | 471 | b = XBUFFER (buffer); |
e578f381 | 472 | if (!BUFFER_LIVE_P (b)) |
d36d71df | 473 | b = NULL; |
1389ad71 | 474 | } |
d36d71df | 475 | return b; |
dcfdbac7 JB |
476 | } |
477 | ||
d36d71df DA |
478 | /* Internal function to set MARKER in BUFFER at POSITION. Non-zero |
479 | RESTRICTED means limit the POSITION by the visible part of BUFFER. */ | |
dcfdbac7 | 480 | |
b0ab8123 | 481 | static Lisp_Object |
d36d71df | 482 | set_marker_internal (Lisp_Object marker, Lisp_Object position, |
7cded46f | 483 | Lisp_Object buffer, bool restricted) |
dcfdbac7 | 484 | { |
7cded46f PE |
485 | struct Lisp_Marker *m; |
486 | struct buffer *b = live_buffer (buffer); | |
dcfdbac7 | 487 | |
b7826503 | 488 | CHECK_MARKER (marker); |
5e097e00 SM |
489 | m = XMARKER (marker); |
490 | ||
d36d71df DA |
491 | /* Set MARKER to point nowhere if BUFFER is dead, or |
492 | POSITION is nil or a marker points to nowhere. */ | |
493 | if (NILP (position) | |
494 | || (MARKERP (position) && !XMARKER (position)->buffer) | |
495 | || !b) | |
496 | unchain_marker (m); | |
497 | ||
498 | /* Optimize the special case where we are copying the position of | |
499 | an existing marker, and MARKER is already in the same buffer. */ | |
500 | else if (MARKERP (position) && b == XMARKER (position)->buffer | |
501 | && b == m->buffer) | |
dcfdbac7 | 502 | { |
d36d71df DA |
503 | m->bytepos = XMARKER (position)->bytepos; |
504 | m->charpos = XMARKER (position)->charpos; | |
dcfdbac7 JB |
505 | } |
506 | ||
dcfdbac7 JB |
507 | else |
508 | { | |
d36d71df | 509 | register ptrdiff_t charpos, bytepos; |
1088b922 | 510 | |
d36d71df DA |
511 | CHECK_NUMBER_COERCE_MARKER (position); |
512 | charpos = clip_to_bounds (restricted ? BUF_BEGV (b) : BUF_BEG (b), | |
513 | XINT (position), | |
514 | restricted ? BUF_ZV (b) : BUF_Z (b)); | |
515 | bytepos = buf_charpos_to_bytepos (b, charpos); | |
516 | attach_marker (m, b, charpos, bytepos); | |
dcfdbac7 | 517 | } |
d36d71df DA |
518 | return marker; |
519 | } | |
dcfdbac7 | 520 | |
d36d71df DA |
521 | DEFUN ("set-marker", Fset_marker, Sset_marker, 2, 3, 0, |
522 | doc: /* Position MARKER before character number POSITION in BUFFER, | |
523 | which defaults to the current buffer. If POSITION is nil, | |
524 | makes marker point nowhere so it no longer slows down | |
525 | editing in any buffer. Returns MARKER. */) | |
526 | (Lisp_Object marker, Lisp_Object position, Lisp_Object buffer) | |
527 | { | |
528 | return set_marker_internal (marker, position, buffer, 0); | |
529 | } | |
1389ad71 | 530 | |
d36d71df | 531 | /* Like the above, but won't let the position be outside the visible part. */ |
177c0ea7 | 532 | |
d36d71df DA |
533 | Lisp_Object |
534 | set_marker_restricted (Lisp_Object marker, Lisp_Object position, | |
535 | Lisp_Object buffer) | |
536 | { | |
537 | return set_marker_internal (marker, position, buffer, 1); | |
dcfdbac7 | 538 | } |
d36d71df | 539 | |
1389ad71 RS |
540 | /* Set the position of MARKER, specifying both the |
541 | character position and the corresponding byte position. */ | |
dcfdbac7 | 542 | |
177c0ea7 | 543 | Lisp_Object |
d36d71df DA |
544 | set_marker_both (Lisp_Object marker, Lisp_Object buffer, |
545 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
1389ad71 | 546 | { |
1389ad71 | 547 | register struct Lisp_Marker *m; |
d36d71df | 548 | register struct buffer *b = live_buffer (buffer); |
1389ad71 | 549 | |
b7826503 | 550 | CHECK_MARKER (marker); |
5e097e00 | 551 | m = XMARKER (marker); |
1389ad71 | 552 | |
d36d71df DA |
553 | if (b) |
554 | attach_marker (m, b, charpos, bytepos); | |
1389ad71 | 555 | else |
d36d71df | 556 | unchain_marker (m); |
1389ad71 RS |
557 | return marker; |
558 | } | |
559 | ||
d36d71df | 560 | /* Like the above, but won't let the position be outside the visible part. */ |
1389ad71 | 561 | |
177c0ea7 | 562 | Lisp_Object |
d36d71df DA |
563 | set_marker_restricted_both (Lisp_Object marker, Lisp_Object buffer, |
564 | ptrdiff_t charpos, ptrdiff_t bytepos) | |
1389ad71 | 565 | { |
1389ad71 | 566 | register struct Lisp_Marker *m; |
d36d71df | 567 | register struct buffer *b = live_buffer (buffer); |
1389ad71 | 568 | |
b7826503 | 569 | CHECK_MARKER (marker); |
5e097e00 | 570 | m = XMARKER (marker); |
1389ad71 | 571 | |
d36d71df | 572 | if (b) |
1389ad71 | 573 | { |
1088b922 PE |
574 | attach_marker |
575 | (m, b, | |
d36d71df DA |
576 | clip_to_bounds (BUF_BEGV (b), charpos, BUF_ZV (b)), |
577 | clip_to_bounds (BUF_BEGV_BYTE (b), bytepos, BUF_ZV_BYTE (b))); | |
1389ad71 | 578 | } |
d36d71df DA |
579 | else |
580 | unchain_marker (m); | |
1389ad71 RS |
581 | return marker; |
582 | } | |
d36d71df | 583 | |
7b7ae965 DA |
584 | /* Remove MARKER from the chain of whatever buffer it is in, |
585 | leaving it points to nowhere. This is called during garbage | |
586 | collection, so we must be careful to ignore and preserve | |
587 | mark bits, including those in chain fields of markers. */ | |
dcfdbac7 | 588 | |
c0323249 | 589 | void |
971de7fb | 590 | unchain_marker (register struct Lisp_Marker *marker) |
dcfdbac7 | 591 | { |
7b7ae965 | 592 | register struct buffer *b = marker->buffer; |
dcfdbac7 | 593 | |
7b7ae965 | 594 | if (b) |
dcfdbac7 | 595 | { |
7b7ae965 DA |
596 | register struct Lisp_Marker *tail, **prev; |
597 | ||
598 | /* No dead buffers here. */ | |
e578f381 | 599 | eassert (BUFFER_LIVE_P (b)); |
7b7ae965 DA |
600 | |
601 | marker->buffer = NULL; | |
602 | prev = &BUF_MARKERS (b); | |
603 | ||
604 | for (tail = BUF_MARKERS (b); tail; prev = &tail->next, tail = *prev) | |
605 | if (marker == tail) | |
606 | { | |
607 | if (*prev == BUF_MARKERS (b)) | |
608 | { | |
1088b922 | 609 | /* Deleting first marker from the buffer's chain. Crash |
7b7ae965 DA |
610 | if new first marker in chain does not say it belongs |
611 | to the same buffer, or at least that they have the same | |
612 | base buffer. */ | |
613 | if (tail->next && b->text != tail->next->buffer->text) | |
1088b922 | 614 | emacs_abort (); |
7b7ae965 DA |
615 | } |
616 | *prev = tail->next; | |
617 | /* We have removed the marker from the chain; | |
618 | no need to scan the rest of the chain. */ | |
619 | break; | |
620 | } | |
621 | ||
622 | /* Error if marker was not in it's chain. */ | |
623 | eassert (tail != NULL); | |
dcfdbac7 | 624 | } |
dcfdbac7 JB |
625 | } |
626 | ||
1389ad71 | 627 | /* Return the char position of marker MARKER, as a C integer. */ |
d281a86a | 628 | |
d311d28c | 629 | ptrdiff_t |
971de7fb | 630 | marker_position (Lisp_Object marker) |
dcfdbac7 JB |
631 | { |
632 | register struct Lisp_Marker *m = XMARKER (marker); | |
633 | register struct buffer *buf = m->buffer; | |
1389ad71 RS |
634 | |
635 | if (!buf) | |
636 | error ("Marker does not point anywhere"); | |
637 | ||
4e57b342 DA |
638 | eassert (BUF_BEG (buf) <= m->charpos && m->charpos <= BUF_Z (buf)); |
639 | ||
1389ad71 RS |
640 | return m->charpos; |
641 | } | |
642 | ||
643 | /* Return the byte position of marker MARKER, as a C integer. */ | |
644 | ||
d311d28c | 645 | ptrdiff_t |
971de7fb | 646 | marker_byte_position (Lisp_Object marker) |
1389ad71 RS |
647 | { |
648 | register struct Lisp_Marker *m = XMARKER (marker); | |
649 | register struct buffer *buf = m->buffer; | |
dcfdbac7 JB |
650 | |
651 | if (!buf) | |
652 | error ("Marker does not point anywhere"); | |
653 | ||
4e57b342 | 654 | eassert (BUF_BEG_BYTE (buf) <= m->bytepos && m->bytepos <= BUF_Z_BYTE (buf)); |
dcfdbac7 | 655 | |
4e57b342 | 656 | return m->bytepos; |
dcfdbac7 | 657 | } |
fc299663 | 658 | \f |
a7ca3326 | 659 | DEFUN ("copy-marker", Fcopy_marker, Scopy_marker, 0, 2, 0, |
2e1280f8 PJ |
660 | doc: /* Return a new marker pointing at the same place as MARKER. |
661 | If argument is a number, makes a new marker pointing | |
662 | at that position in the current buffer. | |
cd196f12 | 663 | If MARKER is not specified, the new marker does not point anywhere. |
2e1280f8 PJ |
664 | The optional argument TYPE specifies the insertion type of the new marker; |
665 | see `marker-insertion-type'. */) | |
5842a27b | 666 | (register Lisp_Object marker, Lisp_Object type) |
dcfdbac7 JB |
667 | { |
668 | register Lisp_Object new; | |
669 | ||
cd196f12 | 670 | if (!NILP (marker)) |
0b4331b7 | 671 | CHECK_TYPE (INTEGERP (marker) || MARKERP (marker), Qinteger_or_marker_p, marker); |
0469366f KH |
672 | |
673 | new = Fmake_marker (); | |
674 | Fset_marker (new, marker, | |
675 | (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil)); | |
676 | XMARKER (new)->insertion_type = !NILP (type); | |
677 | return new; | |
fc299663 RS |
678 | } |
679 | ||
680 | DEFUN ("marker-insertion-type", Fmarker_insertion_type, | |
681 | Smarker_insertion_type, 1, 1, 0, | |
2e1280f8 | 682 | doc: /* Return insertion type of MARKER: t if it stays after inserted text. |
1961ac0f | 683 | The value nil means the marker stays before text inserted there. */) |
5842a27b | 684 | (register Lisp_Object marker) |
fc299663 | 685 | { |
b7826503 | 686 | CHECK_MARKER (marker); |
fc299663 RS |
687 | return XMARKER (marker)->insertion_type ? Qt : Qnil; |
688 | } | |
689 | ||
690 | DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type, | |
691 | Sset_marker_insertion_type, 2, 2, 0, | |
2e1280f8 PJ |
692 | doc: /* Set the insertion-type of MARKER to TYPE. |
693 | If TYPE is t, it means the marker advances when you insert text at it. | |
694 | If TYPE is nil, it means the marker stays behind when you insert text at it. */) | |
5842a27b | 695 | (Lisp_Object marker, Lisp_Object type) |
fc299663 | 696 | { |
b7826503 | 697 | CHECK_MARKER (marker); |
fc299663 RS |
698 | |
699 | XMARKER (marker)->insertion_type = ! NILP (type); | |
700 | return type; | |
dcfdbac7 | 701 | } |
9e5896c6 RS |
702 | |
703 | DEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, Sbuffer_has_markers_at, | |
2e1280f8 PJ |
704 | 1, 1, 0, |
705 | doc: /* Return t if there are markers pointing at POSITION in the current buffer. */) | |
5842a27b | 706 | (Lisp_Object position) |
9e5896c6 | 707 | { |
5e097e00 | 708 | register struct Lisp_Marker *tail; |
4e57b342 | 709 | register ptrdiff_t charpos; |
9e5896c6 | 710 | |
4e57b342 | 711 | charpos = clip_to_bounds (BEG, XINT (position), Z); |
9e5896c6 | 712 | |
5e097e00 | 713 | for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next) |
4e57b342 | 714 | if (tail->charpos == charpos) |
9e5896c6 RS |
715 | return Qt; |
716 | ||
717 | return Qnil; | |
718 | } | |
59d36066 | 719 | |
f1f924b6 | 720 | #ifdef MARKER_DEBUG |
90fc4786 | 721 | |
59d36066 RS |
722 | /* For debugging -- count the markers in buffer BUF. */ |
723 | ||
724 | int | |
971de7fb | 725 | count_markers (struct buffer *buf) |
59d36066 RS |
726 | { |
727 | int total = 0; | |
5e097e00 | 728 | struct Lisp_Marker *tail; |
59d36066 | 729 | |
5e097e00 | 730 | for (tail = BUF_MARKERS (buf); tail; tail = tail->next) |
59d36066 RS |
731 | total++; |
732 | ||
733 | return total; | |
734 | } | |
90fc4786 | 735 | |
f1f924b6 DA |
736 | /* For debugging -- recompute the bytepos corresponding |
737 | to CHARPOS in the simplest, most reliable way. */ | |
738 | ||
739 | ptrdiff_t | |
740 | verify_bytepos (ptrdiff_t charpos) | |
741 | { | |
742 | ptrdiff_t below = 1; | |
743 | ptrdiff_t below_byte = 1; | |
744 | ||
745 | while (below != charpos) | |
746 | { | |
747 | below++; | |
748 | BUF_INC_POS (current_buffer, below_byte); | |
749 | } | |
750 | ||
751 | return below_byte; | |
752 | } | |
753 | ||
754 | #endif /* MARKER_DEBUG */ | |
dcfdbac7 | 755 | \f |
c0323249 | 756 | void |
971de7fb | 757 | syms_of_marker (void) |
dcfdbac7 JB |
758 | { |
759 | defsubr (&Smarker_position); | |
760 | defsubr (&Smarker_buffer); | |
761 | defsubr (&Sset_marker); | |
762 | defsubr (&Scopy_marker); | |
fc299663 RS |
763 | defsubr (&Smarker_insertion_type); |
764 | defsubr (&Sset_marker_insertion_type); | |
9e5896c6 | 765 | defsubr (&Sbuffer_has_markers_at); |
dcfdbac7 | 766 | } |