Commit | Line | Data |
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1389ad71 | 1 | /* Markers: examining, setting and deleting. |
73b0cd50 | 2 | Copyright (C) 1985, 1997-1998, 2001-2011 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 JB |
22 | #include "lisp.h" |
23 | #include "buffer.h" | |
83be827a | 24 | #include "character.h" |
dcfdbac7 | 25 | |
1389ad71 RS |
26 | /* Record one cached position found recently by |
27 | buf_charpos_to_bytepos or buf_bytepos_to_charpos. */ | |
28 | ||
0350982f LMI |
29 | static EMACS_INT cached_charpos; |
30 | static EMACS_INT cached_bytepos; | |
1389ad71 RS |
31 | static struct buffer *cached_buffer; |
32 | static int cached_modiff; | |
31f8ab72 | 33 | |
0350982f | 34 | static void byte_char_debug_check (struct buffer *, EMACS_INT, EMACS_INT); |
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 | { \ | |
0350982f | 58 | EMACS_INT this_charpos = (CHARPOS); \ |
1389ad71 RS |
59 | int changed = 0; \ |
60 | \ | |
61 | if (this_charpos == charpos) \ | |
6e57421b | 62 | { \ |
0350982f | 63 | EMACS_INT 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 | { \ |
0350982f | 88 | EMACS_INT 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 |
0350982f | 97 | byte_char_debug_check (struct buffer *b, EMACS_INT charpos, EMACS_INT bytepos) |
6e57421b | 98 | { |
0350982f | 99 | EMACS_INT 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 | ||
0350982f LMI |
116 | EMACS_INT |
117 | charpos_to_bytepos (EMACS_INT charpos) | |
1389ad71 RS |
118 | { |
119 | return buf_charpos_to_bytepos (current_buffer, charpos); | |
120 | } | |
121 | ||
0350982f LMI |
122 | EMACS_INT |
123 | buf_charpos_to_bytepos (struct buffer *b, EMACS_INT charpos) | |
1389ad71 | 124 | { |
5e097e00 | 125 | struct Lisp_Marker *tail; |
0350982f LMI |
126 | EMACS_INT best_above, best_above_byte; |
127 | EMACS_INT 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 | ||
da43f021 EZ |
245 | EMACS_INT |
246 | verify_bytepos (EMACS_INT charpos) | |
55a91ea3 | 247 | { |
da43f021 EZ |
248 | EMACS_INT below = 1; |
249 | EMACS_INT below_byte = 1; | |
55a91ea3 RS |
250 | |
251 | while (below != charpos) | |
252 | { | |
253 | below++; | |
254 | BUF_INC_POS (current_buffer, below_byte); | |
255 | } | |
256 | ||
257 | return below_byte; | |
258 | } | |
1389ad71 RS |
259 | \f |
260 | /* bytepos_to_charpos returns the char position corresponding to BYTEPOS. */ | |
261 | ||
262 | /* This macro is a subroutine of bytepos_to_charpos. | |
263 | It is used when BYTEPOS is actually the byte position. */ | |
264 | ||
265 | #define CONSIDER(BYTEPOS, CHARPOS) \ | |
266 | { \ | |
0350982f | 267 | EMACS_INT this_bytepos = (BYTEPOS); \ |
1389ad71 RS |
268 | int changed = 0; \ |
269 | \ | |
270 | if (this_bytepos == bytepos) \ | |
6e57421b | 271 | { \ |
0350982f | 272 | EMACS_INT value = (CHARPOS); \ |
6e57421b RS |
273 | if (byte_debug_flag) \ |
274 | byte_char_debug_check (b, value, bytepos); \ | |
275 | return value; \ | |
276 | } \ | |
1389ad71 RS |
277 | else if (this_bytepos > bytepos) \ |
278 | { \ | |
279 | if (this_bytepos < best_above_byte) \ | |
280 | { \ | |
281 | best_above = (CHARPOS); \ | |
282 | best_above_byte = this_bytepos; \ | |
283 | changed = 1; \ | |
284 | } \ | |
285 | } \ | |
286 | else if (this_bytepos > best_below_byte) \ | |
287 | { \ | |
288 | best_below = (CHARPOS); \ | |
289 | best_below_byte = this_bytepos; \ | |
290 | changed = 1; \ | |
291 | } \ | |
292 | \ | |
293 | if (changed) \ | |
294 | { \ | |
295 | if (best_above - best_below == best_above_byte - best_below_byte) \ | |
6e57421b | 296 | { \ |
0350982f | 297 | EMACS_INT value = best_below + (bytepos - best_below_byte); \ |
6e57421b RS |
298 | if (byte_debug_flag) \ |
299 | byte_char_debug_check (b, value, bytepos); \ | |
300 | return value; \ | |
301 | } \ | |
1389ad71 RS |
302 | } \ |
303 | } | |
304 | ||
0350982f LMI |
305 | EMACS_INT |
306 | bytepos_to_charpos (EMACS_INT bytepos) | |
1389ad71 RS |
307 | { |
308 | return buf_bytepos_to_charpos (current_buffer, bytepos); | |
309 | } | |
310 | ||
0350982f LMI |
311 | EMACS_INT |
312 | buf_bytepos_to_charpos (struct buffer *b, EMACS_INT bytepos) | |
1389ad71 | 313 | { |
5e097e00 | 314 | struct Lisp_Marker *tail; |
0350982f LMI |
315 | EMACS_INT best_above, best_above_byte; |
316 | EMACS_INT best_below, best_below_byte; | |
1389ad71 RS |
317 | |
318 | if (bytepos < BUF_BEG_BYTE (b) || bytepos > BUF_Z_BYTE (b)) | |
319 | abort (); | |
320 | ||
321 | best_above = BUF_Z (b); | |
322 | best_above_byte = BUF_Z_BYTE (b); | |
323 | ||
324 | /* If this buffer has as many characters as bytes, | |
325 | each character must be one byte. | |
326 | This takes care of the case where enable-multibyte-characters is nil. */ | |
327 | if (best_above == best_above_byte) | |
328 | return bytepos; | |
329 | ||
3ab364ce SM |
330 | best_below = BEG; |
331 | best_below_byte = BEG_BYTE; | |
1389ad71 RS |
332 | |
333 | CONSIDER (BUF_PT_BYTE (b), BUF_PT (b)); | |
334 | CONSIDER (BUF_GPT_BYTE (b), BUF_GPT (b)); | |
335 | CONSIDER (BUF_BEGV_BYTE (b), BUF_BEGV (b)); | |
336 | CONSIDER (BUF_ZV_BYTE (b), BUF_ZV (b)); | |
337 | ||
338 | if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff) | |
339 | CONSIDER (cached_bytepos, cached_charpos); | |
340 | ||
5e097e00 | 341 | for (tail = BUF_MARKERS (b); tail; tail = tail->next) |
1389ad71 | 342 | { |
5e097e00 | 343 | CONSIDER (tail->bytepos, tail->charpos); |
1389ad71 RS |
344 | |
345 | /* If we are down to a range of 50 chars, | |
346 | don't bother checking any other markers; | |
347 | scan the intervening chars directly now. */ | |
348 | if (best_above - best_below < 50) | |
349 | break; | |
1389ad71 RS |
350 | } |
351 | ||
352 | /* We get here if we did not exactly hit one of the known places. | |
353 | We have one known above and one known below. | |
354 | Scan, counting characters, from whichever one is closer. */ | |
355 | ||
356 | if (bytepos - best_below_byte < best_above_byte - bytepos) | |
357 | { | |
7693a579 | 358 | int record = bytepos - best_below_byte > 5000; |
1389ad71 RS |
359 | |
360 | while (best_below_byte < bytepos) | |
361 | { | |
362 | best_below++; | |
363 | BUF_INC_POS (b, best_below_byte); | |
364 | } | |
365 | ||
366 | /* If this position is quite far from the nearest known position, | |
367 | cache the correspondence by creating a marker here. | |
7693a579 RS |
368 | It will last until the next GC. |
369 | But don't do it if BUF_MARKERS is nil; | |
370 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 371 | if (record && BUF_MARKERS (b)) |
1389ad71 | 372 | { |
b8f477cb | 373 | Lisp_Object marker, buffer; |
1389ad71 | 374 | marker = Fmake_marker (); |
b8f477cb KH |
375 | XSETBUFFER (buffer, b); |
376 | set_marker_both (marker, buffer, best_below, best_below_byte); | |
1389ad71 RS |
377 | } |
378 | ||
6e57421b RS |
379 | if (byte_debug_flag) |
380 | byte_char_debug_check (b, best_below, bytepos); | |
381 | ||
1389ad71 RS |
382 | cached_buffer = b; |
383 | cached_modiff = BUF_MODIFF (b); | |
384 | cached_charpos = best_below; | |
385 | cached_bytepos = best_below_byte; | |
386 | ||
387 | return best_below; | |
388 | } | |
389 | else | |
390 | { | |
391 | int record = best_above_byte - bytepos > 5000; | |
392 | ||
393 | while (best_above_byte > bytepos) | |
394 | { | |
395 | best_above--; | |
396 | BUF_DEC_POS (b, best_above_byte); | |
397 | } | |
398 | ||
399 | /* If this position is quite far from the nearest known position, | |
400 | cache the correspondence by creating a marker here. | |
7693a579 RS |
401 | It will last until the next GC. |
402 | But don't do it if BUF_MARKERS is nil; | |
403 | that is a signal from Fset_buffer_multibyte. */ | |
5e097e00 | 404 | if (record && BUF_MARKERS (b)) |
1389ad71 | 405 | { |
b8f477cb | 406 | Lisp_Object marker, buffer; |
1389ad71 | 407 | marker = Fmake_marker (); |
b8f477cb KH |
408 | XSETBUFFER (buffer, b); |
409 | set_marker_both (marker, buffer, best_above, best_above_byte); | |
1389ad71 RS |
410 | } |
411 | ||
6e57421b RS |
412 | if (byte_debug_flag) |
413 | byte_char_debug_check (b, best_above, bytepos); | |
414 | ||
1389ad71 RS |
415 | cached_buffer = b; |
416 | cached_modiff = BUF_MODIFF (b); | |
417 | cached_charpos = best_above; | |
418 | cached_bytepos = best_above_byte; | |
419 | ||
420 | return best_above; | |
421 | } | |
422 | } | |
423 | ||
424 | #undef CONSIDER | |
425 | \f | |
dcfdbac7 JB |
426 | /* Operations on markers. */ |
427 | ||
428 | DEFUN ("marker-buffer", Fmarker_buffer, Smarker_buffer, 1, 1, 0, | |
2e1280f8 PJ |
429 | doc: /* Return the buffer that MARKER points into, or nil if none. |
430 | Returns nil if MARKER points into a dead buffer. */) | |
5842a27b | 431 | (register Lisp_Object marker) |
dcfdbac7 JB |
432 | { |
433 | register Lisp_Object buf; | |
b7826503 | 434 | CHECK_MARKER (marker); |
dcfdbac7 JB |
435 | if (XMARKER (marker)->buffer) |
436 | { | |
0e11d869 | 437 | XSETBUFFER (buf, XMARKER (marker)->buffer); |
0754c46a SM |
438 | /* If the buffer is dead, we're in trouble: the buffer pointer here |
439 | does not preserve the buffer from being GC'd (it's weak), so | |
440 | markers have to be unlinked from their buffer as soon as the buffer | |
441 | is killed. */ | |
442 | eassert (!NILP (XBUFFER (buf)->name)); | |
443 | return buf; | |
dcfdbac7 JB |
444 | } |
445 | return Qnil; | |
446 | } | |
447 | ||
448 | DEFUN ("marker-position", Fmarker_position, Smarker_position, 1, 1, 0, | |
243d70e5 JL |
449 | doc: /* Return the position MARKER points at, as a character number. |
450 | Returns nil if MARKER points nowhere. */) | |
5842a27b | 451 | (Lisp_Object marker) |
dcfdbac7 | 452 | { |
b7826503 | 453 | CHECK_MARKER (marker); |
dcfdbac7 | 454 | if (XMARKER (marker)->buffer) |
1389ad71 | 455 | return make_number (XMARKER (marker)->charpos); |
dcfdbac7 | 456 | |
dcfdbac7 JB |
457 | return Qnil; |
458 | } | |
fc299663 | 459 | \f |
dcfdbac7 | 460 | DEFUN ("set-marker", Fset_marker, Sset_marker, 2, 3, 0, |
2e1280f8 PJ |
461 | doc: /* Position MARKER before character number POSITION in BUFFER. |
462 | BUFFER defaults to the current buffer. | |
463 | If POSITION is nil, makes marker point nowhere. | |
464 | Then it no longer slows down editing in any buffer. | |
465 | Returns MARKER. */) | |
5842a27b | 466 | (Lisp_Object marker, Lisp_Object position, Lisp_Object buffer) |
dcfdbac7 | 467 | { |
0350982f | 468 | register EMACS_INT charno, bytepos; |
dcfdbac7 JB |
469 | register struct buffer *b; |
470 | register struct Lisp_Marker *m; | |
471 | ||
b7826503 | 472 | CHECK_MARKER (marker); |
5e097e00 SM |
473 | m = XMARKER (marker); |
474 | ||
dcfdbac7 JB |
475 | /* If position is nil or a marker that points nowhere, |
476 | make this marker point nowhere. */ | |
9be191c9 EN |
477 | if (NILP (position) |
478 | || (MARKERP (position) && !XMARKER (position)->buffer)) | |
dcfdbac7 | 479 | { |
5e097e00 | 480 | unchain_marker (m); |
dcfdbac7 JB |
481 | return marker; |
482 | } | |
483 | ||
d427b66a | 484 | if (NILP (buffer)) |
dcfdbac7 JB |
485 | b = current_buffer; |
486 | else | |
487 | { | |
b7826503 | 488 | CHECK_BUFFER (buffer); |
dcfdbac7 JB |
489 | b = XBUFFER (buffer); |
490 | /* If buffer is dead, set marker to point nowhere. */ | |
491 | if (EQ (b->name, Qnil)) | |
492 | { | |
5e097e00 | 493 | unchain_marker (m); |
dcfdbac7 JB |
494 | return marker; |
495 | } | |
496 | } | |
497 | ||
1389ad71 RS |
498 | /* Optimize the special case where we are copying the position |
499 | of an existing marker, and MARKER is already in the same buffer. */ | |
500 | if (MARKERP (position) && b == XMARKER (position)->buffer | |
501 | && b == m->buffer) | |
502 | { | |
1f03507f | 503 | m->bytepos = XMARKER (position)->bytepos; |
1389ad71 RS |
504 | m->charpos = XMARKER (position)->charpos; |
505 | return marker; | |
506 | } | |
507 | ||
b7826503 | 508 | CHECK_NUMBER_COERCE_MARKER (position); |
1389ad71 RS |
509 | |
510 | charno = XINT (position); | |
511 | ||
dcfdbac7 JB |
512 | if (charno < BUF_BEG (b)) |
513 | charno = BUF_BEG (b); | |
514 | if (charno > BUF_Z (b)) | |
515 | charno = BUF_Z (b); | |
1389ad71 RS |
516 | |
517 | bytepos = buf_charpos_to_bytepos (b, charno); | |
518 | ||
519 | /* Every character is at least one byte. */ | |
520 | if (charno > bytepos) | |
521 | abort (); | |
522 | ||
1f03507f | 523 | m->bytepos = bytepos; |
1389ad71 | 524 | m->charpos = charno; |
dcfdbac7 JB |
525 | |
526 | if (m->buffer != b) | |
527 | { | |
5e097e00 | 528 | unchain_marker (m); |
dcfdbac7 | 529 | m->buffer = b; |
5e097e00 SM |
530 | m->next = BUF_MARKERS (b); |
531 | BUF_MARKERS (b) = m; | |
dcfdbac7 | 532 | } |
177c0ea7 | 533 | |
dcfdbac7 JB |
534 | return marker; |
535 | } | |
536 | ||
537 | /* This version of Fset_marker won't let the position | |
538 | be outside the visible part. */ | |
539 | ||
177c0ea7 | 540 | Lisp_Object |
971de7fb | 541 | set_marker_restricted (Lisp_Object marker, Lisp_Object pos, Lisp_Object buffer) |
dcfdbac7 | 542 | { |
0350982f | 543 | register EMACS_INT charno, bytepos; |
dcfdbac7 JB |
544 | register struct buffer *b; |
545 | register struct Lisp_Marker *m; | |
546 | ||
b7826503 | 547 | CHECK_MARKER (marker); |
5e097e00 SM |
548 | m = XMARKER (marker); |
549 | ||
dcfdbac7 JB |
550 | /* If position is nil or a marker that points nowhere, |
551 | make this marker point nowhere. */ | |
1389ad71 RS |
552 | if (NILP (pos) |
553 | || (MARKERP (pos) && !XMARKER (pos)->buffer)) | |
dcfdbac7 | 554 | { |
5e097e00 | 555 | unchain_marker (m); |
dcfdbac7 JB |
556 | return marker; |
557 | } | |
558 | ||
d427b66a | 559 | if (NILP (buffer)) |
dcfdbac7 JB |
560 | b = current_buffer; |
561 | else | |
562 | { | |
b7826503 | 563 | CHECK_BUFFER (buffer); |
dcfdbac7 JB |
564 | b = XBUFFER (buffer); |
565 | /* If buffer is dead, set marker to point nowhere. */ | |
566 | if (EQ (b->name, Qnil)) | |
567 | { | |
5e097e00 | 568 | unchain_marker (m); |
dcfdbac7 JB |
569 | return marker; |
570 | } | |
571 | } | |
572 | ||
1389ad71 RS |
573 | /* Optimize the special case where we are copying the position |
574 | of an existing marker, and MARKER is already in the same buffer. */ | |
575 | if (MARKERP (pos) && b == XMARKER (pos)->buffer | |
576 | && b == m->buffer) | |
577 | { | |
1f03507f | 578 | m->bytepos = XMARKER (pos)->bytepos; |
1389ad71 RS |
579 | m->charpos = XMARKER (pos)->charpos; |
580 | return marker; | |
581 | } | |
582 | ||
b7826503 | 583 | CHECK_NUMBER_COERCE_MARKER (pos); |
1389ad71 RS |
584 | |
585 | charno = XINT (pos); | |
586 | ||
dcfdbac7 JB |
587 | if (charno < BUF_BEGV (b)) |
588 | charno = BUF_BEGV (b); | |
589 | if (charno > BUF_ZV (b)) | |
590 | charno = BUF_ZV (b); | |
1389ad71 RS |
591 | |
592 | bytepos = buf_charpos_to_bytepos (b, charno); | |
593 | ||
594 | /* Every character is at least one byte. */ | |
595 | if (charno > bytepos) | |
596 | abort (); | |
597 | ||
1f03507f | 598 | m->bytepos = bytepos; |
1389ad71 | 599 | m->charpos = charno; |
dcfdbac7 JB |
600 | |
601 | if (m->buffer != b) | |
602 | { | |
5e097e00 | 603 | unchain_marker (m); |
dcfdbac7 | 604 | m->buffer = b; |
5e097e00 SM |
605 | m->next = BUF_MARKERS (b); |
606 | BUF_MARKERS (b) = m; | |
dcfdbac7 | 607 | } |
177c0ea7 | 608 | |
dcfdbac7 JB |
609 | return marker; |
610 | } | |
1389ad71 RS |
611 | \f |
612 | /* Set the position of MARKER, specifying both the | |
613 | character position and the corresponding byte position. */ | |
dcfdbac7 | 614 | |
177c0ea7 | 615 | Lisp_Object |
0350982f | 616 | set_marker_both (Lisp_Object marker, Lisp_Object buffer, EMACS_INT charpos, EMACS_INT bytepos) |
1389ad71 RS |
617 | { |
618 | register struct buffer *b; | |
619 | register struct Lisp_Marker *m; | |
620 | ||
b7826503 | 621 | CHECK_MARKER (marker); |
5e097e00 | 622 | m = XMARKER (marker); |
1389ad71 | 623 | |
1389ad71 RS |
624 | if (NILP (buffer)) |
625 | b = current_buffer; | |
626 | else | |
627 | { | |
b7826503 | 628 | CHECK_BUFFER (buffer); |
1389ad71 RS |
629 | b = XBUFFER (buffer); |
630 | /* If buffer is dead, set marker to point nowhere. */ | |
631 | if (EQ (b->name, Qnil)) | |
632 | { | |
5e097e00 | 633 | unchain_marker (m); |
1389ad71 RS |
634 | return marker; |
635 | } | |
636 | } | |
637 | ||
1389ad71 RS |
638 | /* In a single-byte buffer, the two positions must be equal. */ |
639 | if (BUF_Z (b) == BUF_Z_BYTE (b) | |
640 | && charpos != bytepos) | |
641 | abort (); | |
642 | /* Every character is at least one byte. */ | |
643 | if (charpos > bytepos) | |
644 | abort (); | |
645 | ||
1f03507f | 646 | m->bytepos = bytepos; |
1389ad71 RS |
647 | m->charpos = charpos; |
648 | ||
649 | if (m->buffer != b) | |
650 | { | |
5e097e00 | 651 | unchain_marker (m); |
1389ad71 | 652 | m->buffer = b; |
5e097e00 SM |
653 | m->next = BUF_MARKERS (b); |
654 | BUF_MARKERS (b) = m; | |
1389ad71 | 655 | } |
177c0ea7 | 656 | |
1389ad71 RS |
657 | return marker; |
658 | } | |
659 | ||
660 | /* This version of set_marker_both won't let the position | |
661 | be outside the visible part. */ | |
662 | ||
177c0ea7 | 663 | Lisp_Object |
0350982f | 664 | set_marker_restricted_both (Lisp_Object marker, Lisp_Object buffer, EMACS_INT charpos, EMACS_INT bytepos) |
1389ad71 RS |
665 | { |
666 | register struct buffer *b; | |
667 | register struct Lisp_Marker *m; | |
668 | ||
b7826503 | 669 | CHECK_MARKER (marker); |
5e097e00 | 670 | m = XMARKER (marker); |
1389ad71 RS |
671 | |
672 | if (NILP (buffer)) | |
673 | b = current_buffer; | |
674 | else | |
675 | { | |
b7826503 | 676 | CHECK_BUFFER (buffer); |
1389ad71 RS |
677 | b = XBUFFER (buffer); |
678 | /* If buffer is dead, set marker to point nowhere. */ | |
679 | if (EQ (b->name, Qnil)) | |
680 | { | |
5e097e00 | 681 | unchain_marker (m); |
1389ad71 RS |
682 | return marker; |
683 | } | |
684 | } | |
685 | ||
1389ad71 RS |
686 | if (charpos < BUF_BEGV (b)) |
687 | charpos = BUF_BEGV (b); | |
688 | if (charpos > BUF_ZV (b)) | |
689 | charpos = BUF_ZV (b); | |
690 | if (bytepos < BUF_BEGV_BYTE (b)) | |
691 | bytepos = BUF_BEGV_BYTE (b); | |
692 | if (bytepos > BUF_ZV_BYTE (b)) | |
693 | bytepos = BUF_ZV_BYTE (b); | |
694 | ||
695 | /* In a single-byte buffer, the two positions must be equal. */ | |
696 | if (BUF_Z (b) == BUF_Z_BYTE (b) | |
697 | && charpos != bytepos) | |
698 | abort (); | |
699 | /* Every character is at least one byte. */ | |
700 | if (charpos > bytepos) | |
701 | abort (); | |
702 | ||
1f03507f | 703 | m->bytepos = bytepos; |
1389ad71 RS |
704 | m->charpos = charpos; |
705 | ||
706 | if (m->buffer != b) | |
707 | { | |
5e097e00 | 708 | unchain_marker (m); |
1389ad71 | 709 | m->buffer = b; |
5e097e00 SM |
710 | m->next = BUF_MARKERS (b); |
711 | BUF_MARKERS (b) = m; | |
1389ad71 | 712 | } |
177c0ea7 | 713 | |
1389ad71 RS |
714 | return marker; |
715 | } | |
716 | \f | |
b5a4bb22 RS |
717 | /* Remove MARKER from the chain of whatever buffer it is in. |
718 | Leave it "in no buffer". | |
719 | ||
720 | This is called during garbage collection, | |
dcfdbac7 JB |
721 | so we must be careful to ignore and preserve mark bits, |
722 | including those in chain fields of markers. */ | |
723 | ||
c0323249 | 724 | void |
971de7fb | 725 | unchain_marker (register struct Lisp_Marker *marker) |
dcfdbac7 | 726 | { |
5e097e00 | 727 | register struct Lisp_Marker *tail, *prev, *next; |
dcfdbac7 JB |
728 | register struct buffer *b; |
729 | ||
5e097e00 | 730 | b = marker->buffer; |
dcfdbac7 JB |
731 | if (b == 0) |
732 | return; | |
733 | ||
734 | if (EQ (b->name, Qnil)) | |
735 | abort (); | |
736 | ||
5e097e00 | 737 | marker->buffer = 0; |
7693a579 | 738 | |
d281a86a | 739 | tail = BUF_MARKERS (b); |
5e097e00 SM |
740 | prev = NULL; |
741 | while (tail) | |
dcfdbac7 | 742 | { |
5e097e00 | 743 | next = tail->next; |
dcfdbac7 | 744 | |
5e097e00 | 745 | if (marker == tail) |
dcfdbac7 | 746 | { |
5e097e00 | 747 | if (!prev) |
dcfdbac7 | 748 | { |
d281a86a RS |
749 | BUF_MARKERS (b) = next; |
750 | /* Deleting first marker from the buffer's chain. Crash | |
751 | if new first marker in chain does not say it belongs | |
3686a8de RS |
752 | to the same buffer, or at least that they have the same |
753 | base buffer. */ | |
5e097e00 | 754 | if (next && b->text != next->buffer->text) |
dcfdbac7 JB |
755 | abort (); |
756 | } | |
757 | else | |
5e097e00 | 758 | prev->next = next; |
7693a579 RS |
759 | /* We have removed the marker from the chain; |
760 | no need to scan the rest of the chain. */ | |
761 | return; | |
dcfdbac7 JB |
762 | } |
763 | else | |
764 | prev = tail; | |
765 | tail = next; | |
766 | } | |
7693a579 RS |
767 | |
768 | /* Marker was not in its chain. */ | |
769 | abort (); | |
dcfdbac7 JB |
770 | } |
771 | ||
1389ad71 | 772 | /* Return the char position of marker MARKER, as a C integer. */ |
d281a86a | 773 | |
0350982f | 774 | EMACS_INT |
971de7fb | 775 | marker_position (Lisp_Object marker) |
dcfdbac7 JB |
776 | { |
777 | register struct Lisp_Marker *m = XMARKER (marker); | |
778 | register struct buffer *buf = m->buffer; | |
1389ad71 RS |
779 | |
780 | if (!buf) | |
781 | error ("Marker does not point anywhere"); | |
782 | ||
783 | return m->charpos; | |
784 | } | |
785 | ||
786 | /* Return the byte position of marker MARKER, as a C integer. */ | |
787 | ||
0350982f | 788 | EMACS_INT |
971de7fb | 789 | marker_byte_position (Lisp_Object marker) |
1389ad71 RS |
790 | { |
791 | register struct Lisp_Marker *m = XMARKER (marker); | |
792 | register struct buffer *buf = m->buffer; | |
0350982f | 793 | register EMACS_INT i = m->bytepos; |
dcfdbac7 JB |
794 | |
795 | if (!buf) | |
796 | error ("Marker does not point anywhere"); | |
797 | ||
1389ad71 | 798 | if (i < BUF_BEG_BYTE (buf) || i > BUF_Z_BYTE (buf)) |
dcfdbac7 JB |
799 | abort (); |
800 | ||
801 | return i; | |
802 | } | |
fc299663 | 803 | \f |
cd196f12 | 804 | DEFUN ("copy-marker", Fcopy_marker, Scopy_marker, 0, 2, 0, |
2e1280f8 PJ |
805 | doc: /* Return a new marker pointing at the same place as MARKER. |
806 | If argument is a number, makes a new marker pointing | |
807 | at that position in the current buffer. | |
cd196f12 | 808 | If MARKER is not specified, the new marker does not point anywhere. |
2e1280f8 PJ |
809 | The optional argument TYPE specifies the insertion type of the new marker; |
810 | see `marker-insertion-type'. */) | |
5842a27b | 811 | (register Lisp_Object marker, Lisp_Object type) |
dcfdbac7 JB |
812 | { |
813 | register Lisp_Object new; | |
814 | ||
cd196f12 | 815 | if (!NILP (marker)) |
0b4331b7 | 816 | CHECK_TYPE (INTEGERP (marker) || MARKERP (marker), Qinteger_or_marker_p, marker); |
0469366f KH |
817 | |
818 | new = Fmake_marker (); | |
819 | Fset_marker (new, marker, | |
820 | (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil)); | |
821 | XMARKER (new)->insertion_type = !NILP (type); | |
822 | return new; | |
fc299663 RS |
823 | } |
824 | ||
825 | DEFUN ("marker-insertion-type", Fmarker_insertion_type, | |
826 | Smarker_insertion_type, 1, 1, 0, | |
2e1280f8 | 827 | doc: /* Return insertion type of MARKER: t if it stays after inserted text. |
1961ac0f | 828 | The value nil means the marker stays before text inserted there. */) |
5842a27b | 829 | (register Lisp_Object marker) |
fc299663 | 830 | { |
b7826503 | 831 | CHECK_MARKER (marker); |
fc299663 RS |
832 | return XMARKER (marker)->insertion_type ? Qt : Qnil; |
833 | } | |
834 | ||
835 | DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type, | |
836 | Sset_marker_insertion_type, 2, 2, 0, | |
2e1280f8 PJ |
837 | doc: /* Set the insertion-type of MARKER to TYPE. |
838 | If TYPE is t, it means the marker advances when you insert text at it. | |
839 | If TYPE is nil, it means the marker stays behind when you insert text at it. */) | |
5842a27b | 840 | (Lisp_Object marker, Lisp_Object type) |
fc299663 | 841 | { |
b7826503 | 842 | CHECK_MARKER (marker); |
fc299663 RS |
843 | |
844 | XMARKER (marker)->insertion_type = ! NILP (type); | |
845 | return type; | |
dcfdbac7 | 846 | } |
9e5896c6 RS |
847 | |
848 | DEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, Sbuffer_has_markers_at, | |
2e1280f8 PJ |
849 | 1, 1, 0, |
850 | doc: /* Return t if there are markers pointing at POSITION in the current buffer. */) | |
5842a27b | 851 | (Lisp_Object position) |
9e5896c6 | 852 | { |
5e097e00 | 853 | register struct Lisp_Marker *tail; |
0350982f | 854 | register EMACS_INT charno; |
9e5896c6 RS |
855 | |
856 | charno = XINT (position); | |
857 | ||
858 | if (charno < BEG) | |
859 | charno = BEG; | |
860 | if (charno > Z) | |
861 | charno = Z; | |
9e5896c6 | 862 | |
5e097e00 SM |
863 | for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next) |
864 | if (tail->charpos == charno) | |
9e5896c6 RS |
865 | return Qt; |
866 | ||
867 | return Qnil; | |
868 | } | |
59d36066 RS |
869 | |
870 | /* For debugging -- count the markers in buffer BUF. */ | |
871 | ||
872 | int | |
971de7fb | 873 | count_markers (struct buffer *buf) |
59d36066 RS |
874 | { |
875 | int total = 0; | |
5e097e00 | 876 | struct Lisp_Marker *tail; |
59d36066 | 877 | |
5e097e00 | 878 | for (tail = BUF_MARKERS (buf); tail; tail = tail->next) |
59d36066 RS |
879 | total++; |
880 | ||
881 | return total; | |
882 | } | |
dcfdbac7 | 883 | \f |
c0323249 | 884 | void |
971de7fb | 885 | syms_of_marker (void) |
dcfdbac7 JB |
886 | { |
887 | defsubr (&Smarker_position); | |
888 | defsubr (&Smarker_buffer); | |
889 | defsubr (&Sset_marker); | |
890 | defsubr (&Scopy_marker); | |
fc299663 RS |
891 | defsubr (&Smarker_insertion_type); |
892 | defsubr (&Sset_marker_insertion_type); | |
9e5896c6 | 893 | defsubr (&Sbuffer_has_markers_at); |
6e57421b | 894 | |
29208e82 | 895 | DEFVAR_BOOL ("byte-debug-flag", byte_debug_flag, |
2e1280f8 | 896 | doc: /* Non-nil enables debugging checks in byte/char position conversions. */); |
6e57421b | 897 | byte_debug_flag = 0; |
dcfdbac7 | 898 | } |
6b61353c | 899 |