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> |
d7306fe6 | 21 | #include <setjmp.h> |
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 | |
d311d28c | 34 | static void byte_char_debug_check (struct buffer *, ptrdiff_t, ptrdiff_t); |
80d26f99 | 35 | |
dfcf069d | 36 | void |
971de7fb | 37 | clear_charpos_cache (struct buffer *b) |
31f8ab72 RS |
38 | { |
39 | if (cached_buffer == b) | |
40 | cached_buffer = 0; | |
41 | } | |
1389ad71 RS |
42 | \f |
43 | /* Converting between character positions and byte positions. */ | |
44 | ||
45 | /* There are several places in the buffer where we know | |
3f67ae94 | 46 | the correspondence: BEG, BEGV, PT, GPT, ZV and Z, |
1389ad71 RS |
47 | and everywhere there is a marker. So we find the one of these places |
48 | that is closest to the specified position, and scan from there. */ | |
49 | ||
50 | /* charpos_to_bytepos returns the byte position corresponding to CHARPOS. */ | |
51 | ||
52 | /* This macro is a subroutine of charpos_to_bytepos. | |
53 | Note that it is desirable that BYTEPOS is not evaluated | |
54 | except when we really want its value. */ | |
55 | ||
56 | #define CONSIDER(CHARPOS, BYTEPOS) \ | |
57 | { \ | |
d311d28c | 58 | ptrdiff_t this_charpos = (CHARPOS); \ |
1389ad71 RS |
59 | int changed = 0; \ |
60 | \ | |
61 | if (this_charpos == charpos) \ | |
6e57421b | 62 | { \ |
d311d28c | 63 | ptrdiff_t value = (BYTEPOS); \ |
6e57421b RS |
64 | if (byte_debug_flag) \ |
65 | byte_char_debug_check (b, charpos, value); \ | |
66 | return value; \ | |
67 | } \ | |
1389ad71 RS |
68 | else if (this_charpos > charpos) \ |
69 | { \ | |
70 | if (this_charpos < best_above) \ | |
71 | { \ | |
72 | best_above = this_charpos; \ | |
73 | best_above_byte = (BYTEPOS); \ | |
74 | changed = 1; \ | |
75 | } \ | |
76 | } \ | |
77 | else if (this_charpos > best_below) \ | |
78 | { \ | |
79 | best_below = this_charpos; \ | |
80 | best_below_byte = (BYTEPOS); \ | |
81 | changed = 1; \ | |
82 | } \ | |
83 | \ | |
84 | if (changed) \ | |
85 | { \ | |
86 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 87 | { \ |
d311d28c | 88 | ptrdiff_t value = best_below_byte + (charpos - best_below); \ |
6e57421b RS |
89 | if (byte_debug_flag) \ |
90 | byte_char_debug_check (b, charpos, value); \ | |
91 | return value; \ | |
92 | } \ | |
1389ad71 RS |
93 | } \ |
94 | } | |
95 | ||
80d26f99 | 96 | static void |
d311d28c | 97 | byte_char_debug_check (struct buffer *b, ptrdiff_t charpos, ptrdiff_t bytepos) |
6e57421b | 98 | { |
d311d28c | 99 | ptrdiff_t nchars = 0; |
6e57421b RS |
100 | |
101 | if (bytepos > BUF_GPT_BYTE (b)) | |
102 | { | |
bab9ce2f KH |
103 | nchars = multibyte_chars_in_text (BUF_BEG_ADDR (b), |
104 | BUF_GPT_BYTE (b) - BUF_BEG_BYTE (b)); | |
105 | nchars += multibyte_chars_in_text (BUF_GAP_END_ADDR (b), | |
106 | bytepos - BUF_GPT_BYTE (b)); | |
6e57421b RS |
107 | } |
108 | else | |
bab9ce2f KH |
109 | nchars = multibyte_chars_in_text (BUF_BEG_ADDR (b), |
110 | bytepos - BUF_BEG_BYTE (b)); | |
6e57421b RS |
111 | |
112 | if (charpos - 1 != nchars) | |
113 | abort (); | |
114 | } | |
115 | ||
d311d28c PE |
116 | ptrdiff_t |
117 | charpos_to_bytepos (ptrdiff_t charpos) | |
1389ad71 RS |
118 | { |
119 | return buf_charpos_to_bytepos (current_buffer, charpos); | |
120 | } | |
121 | ||
d311d28c PE |
122 | ptrdiff_t |
123 | buf_charpos_to_bytepos (struct buffer *b, ptrdiff_t charpos) | |
1389ad71 | 124 | { |
5e097e00 | 125 | struct Lisp_Marker *tail; |
d311d28c PE |
126 | ptrdiff_t best_above, best_above_byte; |
127 | ptrdiff_t best_below, best_below_byte; | |
1389ad71 RS |
128 | |
129 | if (charpos < BUF_BEG (b) || charpos > BUF_Z (b)) | |
130 | abort (); | |
131 | ||
132 | best_above = BUF_Z (b); | |
133 | best_above_byte = BUF_Z_BYTE (b); | |
134 | ||
135 | /* If this buffer has as many characters as bytes, | |
136 | each character must be one byte. | |
137 | This takes care of the case where enable-multibyte-characters is nil. */ | |
138 | if (best_above == best_above_byte) | |
139 | return charpos; | |
140 | ||
3ab364ce SM |
141 | best_below = BEG; |
142 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
143 | |
144 | /* We find in best_above and best_above_byte | |
145 | the closest known point above CHARPOS, | |
146 | and in best_below and best_below_byte | |
147 | the closest known point below CHARPOS, | |
148 | ||
149 | If at any point we can tell that the space between those | |
150 | two best approximations is all single-byte, | |
151 | we interpolate the result immediately. */ | |
152 | ||
153 | CONSIDER (BUF_PT (b), BUF_PT_BYTE (b)); | |
154 | CONSIDER (BUF_GPT (b), BUF_GPT_BYTE (b)); | |
155 | CONSIDER (BUF_BEGV (b), BUF_BEGV_BYTE (b)); | |
156 | CONSIDER (BUF_ZV (b), BUF_ZV_BYTE (b)); | |
157 | ||
158 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
159 | CONSIDER (cached_charpos, cached_bytepos); | |
160 | ||
5e097e00 | 161 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 162 | { |
5e097e00 | 163 | CONSIDER (tail->charpos, tail->bytepos); |
1389ad71 RS |
164 | |
165 | /* If we are down to a range of 50 chars, | |
166 | don't bother checking any other markers; | |
167 | scan the intervening chars directly now. */ | |
168 | if (best_above - best_below < 50) | |
169 | break; | |
1389ad71 RS |
170 | } |
171 | ||
172 | /* We get here if we did not exactly hit one of the known places. | |
173 | We have one known above and one known below. | |
174 | Scan, counting characters, from whichever one is closer. */ | |
175 | ||
176 | if (charpos - best_below < best_above - charpos) | |
177 | { | |
178 | int record = charpos - best_below > 5000; | |
179 | ||
180 | while (best_below != charpos) | |
181 | { | |
182 | best_below++; | |
183 | BUF_INC_POS (b, best_below_byte); | |
184 | } | |
185 | ||
186 | /* If this position is quite far from the nearest known position, | |
187 | cache the correspondence by creating a marker here. | |
188 | It will last until the next GC. */ | |
189 | if (record) | |
190 | { | |
b8f477cb | 191 | Lisp_Object marker, buffer; |
1389ad71 | 192 | marker = Fmake_marker (); |
b8f477cb KH |
193 | XSETBUFFER (buffer, b); |
194 | set_marker_both (marker, buffer, best_below, best_below_byte); | |
1389ad71 RS |
195 | } |
196 | ||
6e57421b RS |
197 | if (byte_debug_flag) |
198 | byte_char_debug_check (b, charpos, best_below_byte); | |
199 | ||
1389ad71 RS |
200 | cached_buffer = b; |
201 | cached_modiff = BUF_MODIFF (b); | |
202 | cached_charpos = best_below; | |
203 | cached_bytepos = best_below_byte; | |
204 | ||
205 | return best_below_byte; | |
206 | } | |
207 | else | |
208 | { | |
209 | int record = best_above - charpos > 5000; | |
210 | ||
211 | while (best_above != charpos) | |
212 | { | |
213 | best_above--; | |
214 | BUF_DEC_POS (b, best_above_byte); | |
215 | } | |
216 | ||
217 | /* If this position is quite far from the nearest known position, | |
218 | cache the correspondence by creating a marker here. | |
219 | It will last until the next GC. */ | |
220 | if (record) | |
221 | { | |
b8f477cb | 222 | Lisp_Object marker, buffer; |
1389ad71 | 223 | marker = Fmake_marker (); |
b8f477cb KH |
224 | XSETBUFFER (buffer, b); |
225 | set_marker_both (marker, buffer, best_above, best_above_byte); | |
1389ad71 RS |
226 | } |
227 | ||
6e57421b RS |
228 | if (byte_debug_flag) |
229 | byte_char_debug_check (b, charpos, best_above_byte); | |
230 | ||
1389ad71 RS |
231 | cached_buffer = b; |
232 | cached_modiff = BUF_MODIFF (b); | |
233 | cached_charpos = best_above; | |
234 | cached_bytepos = best_above_byte; | |
235 | ||
236 | return best_above_byte; | |
237 | } | |
238 | } | |
239 | ||
240 | #undef CONSIDER | |
55a91ea3 RS |
241 | |
242 | /* Used for debugging: recompute the bytepos corresponding to CHARPOS | |
243 | in the simplest, most reliable way. */ | |
244 | ||
d311d28c PE |
245 | extern ptrdiff_t verify_bytepos (ptrdiff_t charpos) EXTERNALLY_VISIBLE; |
246 | ptrdiff_t | |
247 | verify_bytepos (ptrdiff_t charpos) | |
55a91ea3 | 248 | { |
d311d28c PE |
249 | ptrdiff_t below = 1; |
250 | ptrdiff_t below_byte = 1; | |
55a91ea3 RS |
251 | |
252 | while (below != charpos) | |
253 | { | |
254 | below++; | |
255 | BUF_INC_POS (current_buffer, below_byte); | |
256 | } | |
257 | ||
258 | return below_byte; | |
259 | } | |
1389ad71 | 260 | \f |
b4c3046a PE |
261 | /* buf_bytepos_to_charpos returns the char position corresponding to |
262 | BYTEPOS. */ | |
1389ad71 | 263 | |
b4c3046a | 264 | /* This macro is a subroutine of buf_bytepos_to_charpos. |
1389ad71 RS |
265 | It is used when BYTEPOS is actually the byte position. */ |
266 | ||
267 | #define CONSIDER(BYTEPOS, CHARPOS) \ | |
268 | { \ | |
d311d28c | 269 | ptrdiff_t this_bytepos = (BYTEPOS); \ |
1389ad71 RS |
270 | int changed = 0; \ |
271 | \ | |
272 | if (this_bytepos == bytepos) \ | |
6e57421b | 273 | { \ |
d311d28c | 274 | ptrdiff_t value = (CHARPOS); \ |
6e57421b RS |
275 | if (byte_debug_flag) \ |
276 | byte_char_debug_check (b, value, bytepos); \ | |
277 | return value; \ | |
278 | } \ | |
1389ad71 RS |
279 | else if (this_bytepos > bytepos) \ |
280 | { \ | |
281 | if (this_bytepos < best_above_byte) \ | |
282 | { \ | |
283 | best_above = (CHARPOS); \ | |
284 | best_above_byte = this_bytepos; \ | |
285 | changed = 1; \ | |
286 | } \ | |
287 | } \ | |
288 | else if (this_bytepos > best_below_byte) \ | |
289 | { \ | |
290 | best_below = (CHARPOS); \ | |
291 | best_below_byte = this_bytepos; \ | |
292 | changed = 1; \ | |
293 | } \ | |
294 | \ | |
295 | if (changed) \ | |
296 | { \ | |
297 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 298 | { \ |
d311d28c | 299 | ptrdiff_t value = best_below + (bytepos - best_below_byte); \ |
6e57421b RS |
300 | if (byte_debug_flag) \ |
301 | byte_char_debug_check (b, value, bytepos); \ | |
302 | return value; \ | |
303 | } \ | |
1389ad71 RS |
304 | } \ |
305 | } | |
306 | ||
d311d28c PE |
307 | ptrdiff_t |
308 | buf_bytepos_to_charpos (struct buffer *b, ptrdiff_t bytepos) | |
1389ad71 | 309 | { |
5e097e00 | 310 | struct Lisp_Marker *tail; |
d311d28c PE |
311 | ptrdiff_t best_above, best_above_byte; |
312 | ptrdiff_t best_below, best_below_byte; | |
1389ad71 RS |
313 | |
314 | if (bytepos < BUF_BEG_BYTE (b) || bytepos > BUF_Z_BYTE (b)) | |
315 | abort (); | |
316 | ||
317 | best_above = BUF_Z (b); | |
318 | best_above_byte = BUF_Z_BYTE (b); | |
319 | ||
320 | /* If this buffer has as many characters as bytes, | |
321 | each character must be one byte. | |
322 | This takes care of the case where enable-multibyte-characters is nil. */ | |
323 | if (best_above == best_above_byte) | |
324 | return bytepos; | |
325 | ||
3ab364ce SM |
326 | best_below = BEG; |
327 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
328 | |
329 | CONSIDER (BUF_PT_BYTE (b), BUF_PT (b)); | |
330 | CONSIDER (BUF_GPT_BYTE (b), BUF_GPT (b)); | |
331 | CONSIDER (BUF_BEGV_BYTE (b), BUF_BEGV (b)); | |
332 | CONSIDER (BUF_ZV_BYTE (b), BUF_ZV (b)); | |
333 | ||
334 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
335 | CONSIDER (cached_bytepos, cached_charpos); | |
336 | ||
5e097e00 | 337 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 338 | { |
5e097e00 | 339 | CONSIDER (tail->bytepos, tail->charpos); |
1389ad71 RS |
340 | |
341 | /* If we are down to a range of 50 chars, | |
342 | don't bother checking any other markers; | |
343 | scan the intervening chars directly now. */ | |
344 | if (best_above - best_below < 50) | |
345 | break; | |
1389ad71 RS |
346 | } |
347 | ||
348 | /* We get here if we did not exactly hit one of the known places. | |
349 | We have one known above and one known below. | |
350 | Scan, counting characters, from whichever one is closer. */ | |
351 | ||
352 | if (bytepos - best_below_byte < best_above_byte - bytepos) | |
353 | { | |
7693a579 | 354 | int record = bytepos - best_below_byte > 5000; |
1389ad71 RS |
355 | |
356 | while (best_below_byte < bytepos) | |
357 | { | |
358 | best_below++; | |
359 | BUF_INC_POS (b, best_below_byte); | |
360 | } | |
361 | ||
362 | /* If this position is quite far from the nearest known position, | |
363 | cache the correspondence by creating a marker here. | |
7693a579 RS |
364 | It will last until the next GC. |
365 | But don't do it if BUF_MARKERS is nil; | |
366 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 367 | if (record && BUF_MARKERS (b)) |
1389ad71 | 368 | { |
b8f477cb | 369 | Lisp_Object marker, buffer; |
1389ad71 | 370 | marker = Fmake_marker (); |
b8f477cb KH |
371 | XSETBUFFER (buffer, b); |
372 | set_marker_both (marker, buffer, best_below, best_below_byte); | |
1389ad71 RS |
373 | } |
374 | ||
6e57421b RS |
375 | if (byte_debug_flag) |
376 | byte_char_debug_check (b, best_below, bytepos); | |
377 | ||
1389ad71 RS |
378 | cached_buffer = b; |
379 | cached_modiff = BUF_MODIFF (b); | |
380 | cached_charpos = best_below; | |
381 | cached_bytepos = best_below_byte; | |
382 | ||
383 | return best_below; | |
384 | } | |
385 | else | |
386 | { | |
387 | int record = best_above_byte - bytepos > 5000; | |
388 | ||
389 | while (best_above_byte > bytepos) | |
390 | { | |
391 | best_above--; | |
392 | BUF_DEC_POS (b, best_above_byte); | |
393 | } | |
394 | ||
395 | /* If this position is quite far from the nearest known position, | |
396 | cache the correspondence by creating a marker here. | |
7693a579 RS |
397 | It will last until the next GC. |
398 | But don't do it if BUF_MARKERS is nil; | |
399 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 400 | if (record && BUF_MARKERS (b)) |
1389ad71 | 401 | { |
b8f477cb | 402 | Lisp_Object marker, buffer; |
1389ad71 | 403 | marker = Fmake_marker (); |
b8f477cb KH |
404 | XSETBUFFER (buffer, b); |
405 | set_marker_both (marker, buffer, best_above, best_above_byte); | |
1389ad71 RS |
406 | } |
407 | ||
6e57421b RS |
408 | if (byte_debug_flag) |
409 | byte_char_debug_check (b, best_above, bytepos); | |
410 | ||
1389ad71 RS |
411 | cached_buffer = b; |
412 | cached_modiff = BUF_MODIFF (b); | |
413 | cached_charpos = best_above; | |
414 | cached_bytepos = best_above_byte; | |
415 | ||
416 | return best_above; | |
417 | } | |
418 | } | |
419 | ||
420 | #undef CONSIDER | |
421 | \f | |
dcfdbac7 JB |
422 | /* Operations on markers. */ |
423 | ||
a7ca3326 | 424 | DEFUN ("marker-buffer", Fmarker_buffer, Smarker_buffer, 1, 1, 0, |
2e1280f8 PJ |
425 | doc: /* Return the buffer that MARKER points into, or nil if none. |
426 | Returns nil if MARKER points into a dead buffer. */) | |
5842a27b | 427 | (register Lisp_Object marker) |
dcfdbac7 JB |
428 | { |
429 | register Lisp_Object buf; | |
b7826503 | 430 | CHECK_MARKER (marker); |
dcfdbac7 JB |
431 | if (XMARKER (marker)->buffer) |
432 | { | |
0e11d869 | 433 | XSETBUFFER (buf, XMARKER (marker)->buffer); |
0754c46a SM |
434 | /* If the buffer is dead, we're in trouble: the buffer pointer here |
435 | does not preserve the buffer from being GC'd (it's weak), so | |
436 | markers have to be unlinked from their buffer as soon as the buffer | |
437 | is killed. */ | |
4b4deea2 | 438 | eassert (!NILP (BVAR (XBUFFER (buf), name))); |
0754c46a | 439 | return buf; |
dcfdbac7 JB |
440 | } |
441 | return Qnil; | |
442 | } | |
443 | ||
a7ca3326 | 444 | DEFUN ("marker-position", Fmarker_position, Smarker_position, 1, 1, 0, |
243d70e5 JL |
445 | doc: /* Return the position MARKER points at, as a character number. |
446 | Returns nil if MARKER points nowhere. */) | |
5842a27b | 447 | (Lisp_Object marker) |
dcfdbac7 | 448 | { |
b7826503 | 449 | CHECK_MARKER (marker); |
dcfdbac7 | 450 | if (XMARKER (marker)->buffer) |
1389ad71 | 451 | return make_number (XMARKER (marker)->charpos); |
dcfdbac7 | 452 | |
dcfdbac7 JB |
453 | return Qnil; |
454 | } | |
fc299663 | 455 | \f |
a7ca3326 | 456 | DEFUN ("set-marker", Fset_marker, Sset_marker, 2, 3, 0, |
2e1280f8 PJ |
457 | doc: /* Position MARKER before character number POSITION in BUFFER. |
458 | BUFFER defaults to the current buffer. | |
459 | If POSITION is nil, makes marker point nowhere. | |
460 | Then it no longer slows down editing in any buffer. | |
461 | Returns MARKER. */) | |
5842a27b | 462 | (Lisp_Object marker, Lisp_Object position, Lisp_Object buffer) |
dcfdbac7 | 463 | { |
d311d28c PE |
464 | register ptrdiff_t charno; |
465 | register ptrdiff_t bytepos; | |
dcfdbac7 JB |
466 | register struct buffer *b; |
467 | register struct Lisp_Marker *m; | |
468 | ||
b7826503 | 469 | CHECK_MARKER (marker); |
5e097e00 SM |
470 | m = XMARKER (marker); |
471 | ||
dcfdbac7 JB |
472 | /* If position is nil or a marker that points nowhere, |
473 | make this marker point nowhere. */ | |
9be191c9 EN |
474 | if (NILP (position) |
475 | || (MARKERP (position) && !XMARKER (position)->buffer)) | |
dcfdbac7 | 476 | { |
5e097e00 | 477 | unchain_marker (m); |
dcfdbac7 JB |
478 | return marker; |
479 | } | |
480 | ||
d427b66a | 481 | if (NILP (buffer)) |
dcfdbac7 JB |
482 | b = current_buffer; |
483 | else | |
484 | { | |
b7826503 | 485 | CHECK_BUFFER (buffer); |
dcfdbac7 JB |
486 | b = XBUFFER (buffer); |
487 | /* If buffer is dead, set marker to point nowhere. */ | |
4b4deea2 | 488 | if (EQ (BVAR (b, name), Qnil)) |
dcfdbac7 | 489 | { |
5e097e00 | 490 | unchain_marker (m); |
dcfdbac7 JB |
491 | return marker; |
492 | } | |
493 | } | |
494 | ||
1389ad71 RS |
495 | /* Optimize the special case where we are copying the position |
496 | of an existing marker, and MARKER is already in the same buffer. */ | |
497 | if (MARKERP (position) && b == XMARKER (position)->buffer | |
498 | && b == m->buffer) | |
499 | { | |
1f03507f | 500 | m->bytepos = XMARKER (position)->bytepos; |
1389ad71 RS |
501 | m->charpos = XMARKER (position)->charpos; |
502 | return marker; | |
503 | } | |
504 | ||
b7826503 | 505 | CHECK_NUMBER_COERCE_MARKER (position); |
d311d28c | 506 | charno = clip_to_bounds (BUF_BEG (b), XINT (position), BUF_Z (b)); |
1389ad71 RS |
507 | bytepos = buf_charpos_to_bytepos (b, charno); |
508 | ||
509 | /* Every character is at least one byte. */ | |
510 | if (charno > bytepos) | |
511 | abort (); | |
512 | ||
1f03507f | 513 | m->bytepos = bytepos; |
1389ad71 | 514 | m->charpos = charno; |
dcfdbac7 JB |
515 | |
516 | if (m->buffer != b) | |
517 | { | |
5e097e00 | 518 | unchain_marker (m); |
dcfdbac7 | 519 | m->buffer = b; |
5e097e00 SM |
520 | m->next = BUF_MARKERS (b); |
521 | BUF_MARKERS (b) = m; | |
dcfdbac7 | 522 | } |
177c0ea7 | 523 | |
dcfdbac7 JB |
524 | return marker; |
525 | } | |
526 | ||
527 | /* This version of Fset_marker won't let the position | |
528 | be outside the visible part. */ | |
529 | ||
177c0ea7 | 530 | Lisp_Object |
971de7fb | 531 | set_marker_restricted (Lisp_Object marker, Lisp_Object pos, Lisp_Object buffer) |
dcfdbac7 | 532 | { |
d311d28c PE |
533 | register ptrdiff_t charno; |
534 | register ptrdiff_t bytepos; | |
dcfdbac7 JB |
535 | register struct buffer *b; |
536 | register struct Lisp_Marker *m; | |
537 | ||
b7826503 | 538 | CHECK_MARKER (marker); |
5e097e00 SM |
539 | m = XMARKER (marker); |
540 | ||
dcfdbac7 JB |
541 | /* If position is nil or a marker that points nowhere, |
542 | make this marker point nowhere. */ | |
1389ad71 RS |
543 | if (NILP (pos) |
544 | || (MARKERP (pos) && !XMARKER (pos)->buffer)) | |
dcfdbac7 | 545 | { |
5e097e00 | 546 | unchain_marker (m); |
dcfdbac7 JB |
547 | return marker; |
548 | } | |
549 | ||
d427b66a | 550 | if (NILP (buffer)) |
dcfdbac7 JB |
551 | b = current_buffer; |
552 | else | |
553 | { | |
b7826503 | 554 | CHECK_BUFFER (buffer); |
dcfdbac7 JB |
555 | b = XBUFFER (buffer); |
556 | /* If buffer is dead, set marker to point nowhere. */ | |
4b4deea2 | 557 | if (EQ (BVAR (b, name), Qnil)) |
dcfdbac7 | 558 | { |
5e097e00 | 559 | unchain_marker (m); |
dcfdbac7 JB |
560 | return marker; |
561 | } | |
562 | } | |
563 | ||
1389ad71 RS |
564 | /* Optimize the special case where we are copying the position |
565 | of an existing marker, and MARKER is already in the same buffer. */ | |
566 | if (MARKERP (pos) && b == XMARKER (pos)->buffer | |
567 | && b == m->buffer) | |
568 | { | |
1f03507f | 569 | m->bytepos = XMARKER (pos)->bytepos; |
1389ad71 RS |
570 | m->charpos = XMARKER (pos)->charpos; |
571 | return marker; | |
572 | } | |
573 | ||
b7826503 | 574 | CHECK_NUMBER_COERCE_MARKER (pos); |
d311d28c | 575 | charno = clip_to_bounds (BUF_BEGV (b), XINT (pos), BUF_ZV (b)); |
1389ad71 RS |
576 | bytepos = buf_charpos_to_bytepos (b, charno); |
577 | ||
578 | /* Every character is at least one byte. */ | |
579 | if (charno > bytepos) | |
580 | abort (); | |
581 | ||
1f03507f | 582 | m->bytepos = bytepos; |
1389ad71 | 583 | m->charpos = charno; |
dcfdbac7 JB |
584 | |
585 | if (m->buffer != b) | |
586 | { | |
5e097e00 | 587 | unchain_marker (m); |
dcfdbac7 | 588 | m->buffer = b; |
5e097e00 SM |
589 | m->next = BUF_MARKERS (b); |
590 | BUF_MARKERS (b) = m; | |
dcfdbac7 | 591 | } |
177c0ea7 | 592 | |
dcfdbac7 JB |
593 | return marker; |
594 | } | |
1389ad71 RS |
595 | \f |
596 | /* Set the position of MARKER, specifying both the | |
597 | character position and the corresponding byte position. */ | |
dcfdbac7 | 598 | |
177c0ea7 | 599 | Lisp_Object |
d311d28c | 600 | set_marker_both (Lisp_Object marker, Lisp_Object buffer, ptrdiff_t charpos, ptrdiff_t bytepos) |
1389ad71 RS |
601 | { |
602 | register struct buffer *b; | |
603 | register struct Lisp_Marker *m; | |
604 | ||
b7826503 | 605 | CHECK_MARKER (marker); |
5e097e00 | 606 | m = XMARKER (marker); |
1389ad71 | 607 | |
1389ad71 RS |
608 | if (NILP (buffer)) |
609 | b = current_buffer; | |
610 | else | |
611 | { | |
b7826503 | 612 | CHECK_BUFFER (buffer); |
1389ad71 RS |
613 | b = XBUFFER (buffer); |
614 | /* If buffer is dead, set marker to point nowhere. */ | |
4b4deea2 | 615 | if (EQ (BVAR (b, name), Qnil)) |
1389ad71 | 616 | { |
5e097e00 | 617 | unchain_marker (m); |
1389ad71 RS |
618 | return marker; |
619 | } | |
620 | } | |
621 | ||
1389ad71 RS |
622 | /* In a single-byte buffer, the two positions must be equal. */ |
623 | if (BUF_Z (b) == BUF_Z_BYTE (b) | |
624 | && charpos != bytepos) | |
625 | abort (); | |
626 | /* Every character is at least one byte. */ | |
627 | if (charpos > bytepos) | |
628 | abort (); | |
629 | ||
1f03507f | 630 | m->bytepos = bytepos; |
1389ad71 RS |
631 | m->charpos = charpos; |
632 | ||
633 | if (m->buffer != b) | |
634 | { | |
5e097e00 | 635 | unchain_marker (m); |
1389ad71 | 636 | m->buffer = b; |
5e097e00 SM |
637 | m->next = BUF_MARKERS (b); |
638 | BUF_MARKERS (b) = m; | |
1389ad71 | 639 | } |
177c0ea7 | 640 | |
1389ad71 RS |
641 | return marker; |
642 | } | |
643 | ||
644 | /* This version of set_marker_both won't let the position | |
645 | be outside the visible part. */ | |
646 | ||
177c0ea7 | 647 | Lisp_Object |
d311d28c | 648 | set_marker_restricted_both (Lisp_Object marker, Lisp_Object buffer, ptrdiff_t charpos, ptrdiff_t bytepos) |
1389ad71 RS |
649 | { |
650 | register struct buffer *b; | |
651 | register struct Lisp_Marker *m; | |
652 | ||
b7826503 | 653 | CHECK_MARKER (marker); |
5e097e00 | 654 | m = XMARKER (marker); |
1389ad71 RS |
655 | |
656 | if (NILP (buffer)) | |
657 | b = current_buffer; | |
658 | else | |
659 | { | |
b7826503 | 660 | CHECK_BUFFER (buffer); |
1389ad71 RS |
661 | b = XBUFFER (buffer); |
662 | /* If buffer is dead, set marker to point nowhere. */ | |
4b4deea2 | 663 | if (EQ (BVAR (b, name), Qnil)) |
1389ad71 | 664 | { |
5e097e00 | 665 | unchain_marker (m); |
1389ad71 RS |
666 | return marker; |
667 | } | |
668 | } | |
669 | ||
6b312f0f DA |
670 | charpos = clip_to_bounds (BUF_BEGV (b), charpos, BUF_ZV (b)); |
671 | bytepos = clip_to_bounds (BUF_BEGV_BYTE (b), bytepos, BUF_ZV_BYTE (b)); | |
1389ad71 RS |
672 | |
673 | /* In a single-byte buffer, the two positions must be equal. */ | |
674 | if (BUF_Z (b) == BUF_Z_BYTE (b) | |
675 | && charpos != bytepos) | |
676 | abort (); | |
677 | /* Every character is at least one byte. */ | |
678 | if (charpos > bytepos) | |
679 | abort (); | |
680 | ||
1f03507f | 681 | m->bytepos = bytepos; |
1389ad71 RS |
682 | m->charpos = charpos; |
683 | ||
684 | if (m->buffer != b) | |
685 | { | |
5e097e00 | 686 | unchain_marker (m); |
1389ad71 | 687 | m->buffer = b; |
5e097e00 SM |
688 | m->next = BUF_MARKERS (b); |
689 | BUF_MARKERS (b) = m; | |
1389ad71 | 690 | } |
177c0ea7 | 691 | |
1389ad71 RS |
692 | return marker; |
693 | } | |
694 | \f | |
b5a4bb22 RS |
695 | /* Remove MARKER from the chain of whatever buffer it is in. |
696 | Leave it "in no buffer". | |
697 | ||
698 | This is called during garbage collection, | |
dcfdbac7 JB |
699 | so we must be careful to ignore and preserve mark bits, |
700 | including those in chain fields of markers. */ | |
701 | ||
c0323249 | 702 | void |
971de7fb | 703 | unchain_marker (register struct Lisp_Marker *marker) |
dcfdbac7 | 704 | { |
5e097e00 | 705 | register struct Lisp_Marker *tail, *prev, *next; |
dcfdbac7 JB |
706 | register struct buffer *b; |
707 | ||
5e097e00 | 708 | b = marker->buffer; |
dcfdbac7 JB |
709 | if (b == 0) |
710 | return; | |
711 | ||
4b4deea2 | 712 | if (EQ (BVAR (b, name), Qnil)) |
dcfdbac7 JB |
713 | abort (); |
714 | ||
5e097e00 | 715 | marker->buffer = 0; |
7693a579 | 716 | |
d281a86a | 717 | tail = BUF_MARKERS (b); |
5e097e00 SM |
718 | prev = NULL; |
719 | while (tail) | |
dcfdbac7 | 720 | { |
5e097e00 | 721 | next = tail->next; |
dcfdbac7 | 722 | |
5e097e00 | 723 | if (marker == tail) |
dcfdbac7 | 724 | { |
5e097e00 | 725 | if (!prev) |
dcfdbac7 | 726 | { |
d281a86a RS |
727 | BUF_MARKERS (b) = next; |
728 | /* Deleting first marker from the buffer's chain. Crash | |
729 | if new first marker in chain does not say it belongs | |
3686a8de RS |
730 | to the same buffer, or at least that they have the same |
731 | base buffer. */ | |
5e097e00 | 732 | if (next && b->text != next->buffer->text) |
dcfdbac7 JB |
733 | abort (); |
734 | } | |
735 | else | |
5e097e00 | 736 | prev->next = next; |
7693a579 RS |
737 | /* We have removed the marker from the chain; |
738 | no need to scan the rest of the chain. */ | |
739 | return; | |
dcfdbac7 JB |
740 | } |
741 | else | |
742 | prev = tail; | |
743 | tail = next; | |
744 | } | |
7693a579 RS |
745 | |
746 | /* Marker was not in its chain. */ | |
747 | abort (); | |
dcfdbac7 JB |
748 | } |
749 | ||
1389ad71 | 750 | /* Return the char position of marker MARKER, as a C integer. */ |
d281a86a | 751 | |
d311d28c | 752 | ptrdiff_t |
971de7fb | 753 | marker_position (Lisp_Object marker) |
dcfdbac7 JB |
754 | { |
755 | register struct Lisp_Marker *m = XMARKER (marker); | |
756 | register struct buffer *buf = m->buffer; | |
1389ad71 RS |
757 | |
758 | if (!buf) | |
759 | error ("Marker does not point anywhere"); | |
760 | ||
761 | return m->charpos; | |
762 | } | |
763 | ||
764 | /* Return the byte position of marker MARKER, as a C integer. */ | |
765 | ||
d311d28c | 766 | ptrdiff_t |
971de7fb | 767 | marker_byte_position (Lisp_Object marker) |
1389ad71 RS |
768 | { |
769 | register struct Lisp_Marker *m = XMARKER (marker); | |
770 | register struct buffer *buf = m->buffer; | |
d311d28c | 771 | register ptrdiff_t i = m->bytepos; |
dcfdbac7 JB |
772 | |
773 | if (!buf) | |
774 | error ("Marker does not point anywhere"); | |
775 | ||
1389ad71 | 776 | if (i < BUF_BEG_BYTE (buf) || i > BUF_Z_BYTE (buf)) |
dcfdbac7 JB |
777 | abort (); |
778 | ||
779 | return i; | |
780 | } | |
fc299663 | 781 | \f |
a7ca3326 | 782 | DEFUN ("copy-marker", Fcopy_marker, Scopy_marker, 0, 2, 0, |
2e1280f8 PJ |
783 | doc: /* Return a new marker pointing at the same place as MARKER. |
784 | If argument is a number, makes a new marker pointing | |
785 | at that position in the current buffer. | |
cd196f12 | 786 | If MARKER is not specified, the new marker does not point anywhere. |
2e1280f8 PJ |
787 | The optional argument TYPE specifies the insertion type of the new marker; |
788 | see `marker-insertion-type'. */) | |
5842a27b | 789 | (register Lisp_Object marker, Lisp_Object type) |
dcfdbac7 JB |
790 | { |
791 | register Lisp_Object new; | |
792 | ||
cd196f12 | 793 | if (!NILP (marker)) |
0b4331b7 | 794 | CHECK_TYPE (INTEGERP (marker) || MARKERP (marker), Qinteger_or_marker_p, marker); |
0469366f KH |
795 | |
796 | new = Fmake_marker (); | |
797 | Fset_marker (new, marker, | |
798 | (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil)); | |
799 | XMARKER (new)->insertion_type = !NILP (type); | |
800 | return new; | |
fc299663 RS |
801 | } |
802 | ||
803 | DEFUN ("marker-insertion-type", Fmarker_insertion_type, | |
804 | Smarker_insertion_type, 1, 1, 0, | |
2e1280f8 | 805 | doc: /* Return insertion type of MARKER: t if it stays after inserted text. |
1961ac0f | 806 | The value nil means the marker stays before text inserted there. */) |
5842a27b | 807 | (register Lisp_Object marker) |
fc299663 | 808 | { |
b7826503 | 809 | CHECK_MARKER (marker); |
fc299663 RS |
810 | return XMARKER (marker)->insertion_type ? Qt : Qnil; |
811 | } | |
812 | ||
813 | DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type, | |
814 | Sset_marker_insertion_type, 2, 2, 0, | |
2e1280f8 PJ |
815 | doc: /* Set the insertion-type of MARKER to TYPE. |
816 | If TYPE is t, it means the marker advances when you insert text at it. | |
817 | If TYPE is nil, it means the marker stays behind when you insert text at it. */) | |
5842a27b | 818 | (Lisp_Object marker, Lisp_Object type) |
fc299663 | 819 | { |
b7826503 | 820 | CHECK_MARKER (marker); |
fc299663 RS |
821 | |
822 | XMARKER (marker)->insertion_type = ! NILP (type); | |
823 | return type; | |
dcfdbac7 | 824 | } |
9e5896c6 RS |
825 | |
826 | DEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, Sbuffer_has_markers_at, | |
2e1280f8 PJ |
827 | 1, 1, 0, |
828 | doc: /* Return t if there are markers pointing at POSITION in the current buffer. */) | |
5842a27b | 829 | (Lisp_Object position) |
9e5896c6 | 830 | { |
5e097e00 | 831 | register struct Lisp_Marker *tail; |
d311d28c | 832 | register ptrdiff_t charno; |
9e5896c6 | 833 | |
d311d28c | 834 | charno = clip_to_bounds (BEG, XINT (position), Z); |
9e5896c6 | 835 | |
5e097e00 SM |
836 | for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next) |
837 | if (tail->charpos == charno) | |
9e5896c6 RS |
838 | return Qt; |
839 | ||
840 | return Qnil; | |
841 | } | |
59d36066 RS |
842 | |
843 | /* For debugging -- count the markers in buffer BUF. */ | |
844 | ||
e3b27b31 | 845 | extern int count_markers (struct buffer *) EXTERNALLY_VISIBLE; |
59d36066 | 846 | int |
971de7fb | 847 | count_markers (struct buffer *buf) |
59d36066 RS |
848 | { |
849 | int total = 0; | |
5e097e00 | 850 | struct Lisp_Marker *tail; |
59d36066 | 851 | |
5e097e00 | 852 | for (tail = BUF_MARKERS (buf); tail; tail = tail->next) |
59d36066 RS |
853 | total++; |
854 | ||
855 | return total; | |
856 | } | |
dcfdbac7 | 857 | \f |
c0323249 | 858 | void |
971de7fb | 859 | syms_of_marker (void) |
dcfdbac7 JB |
860 | { |
861 | defsubr (&Smarker_position); | |
862 | defsubr (&Smarker_buffer); | |
863 | defsubr (&Sset_marker); | |
864 | defsubr (&Scopy_marker); | |
fc299663 RS |
865 | defsubr (&Smarker_insertion_type); |
866 | defsubr (&Sset_marker_insertion_type); | |
9e5896c6 | 867 | defsubr (&Sbuffer_has_markers_at); |
6e57421b | 868 | |
29208e82 | 869 | DEFVAR_BOOL ("byte-debug-flag", byte_debug_flag, |
2e1280f8 | 870 | doc: /* Non-nil enables debugging checks in byte/char position conversions. */); |
6e57421b | 871 | byte_debug_flag = 0; |
dcfdbac7 | 872 | } |