Commit | Line | Data |
---|---|---|
993b6404 | 1 | /* Indentation functions. |
6cbc951e | 2 | Copyright (C) 1985,86,87,88,93,94,95,98,2000,01,02,03,2004 |
88c6e37e | 3 | Free Software Foundation, Inc. |
993b6404 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
7c938215 | 9 | the Free Software Foundation; either version 2, or (at your option) |
993b6404 JB |
10 | any later version. |
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 | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
993b6404 | 21 | |
18160b98 | 22 | #include <config.h> |
4d553a13 KL |
23 | #include <stdio.h> |
24 | ||
993b6404 JB |
25 | #include "lisp.h" |
26 | #include "buffer.h" | |
a997a7ca | 27 | #include "charset.h" |
fb911777 | 28 | #include "category.h" |
993b6404 | 29 | #include "indent.h" |
2538fae4 | 30 | #include "keyboard.h" |
502b9b64 | 31 | #include "frame.h" |
993b6404 JB |
32 | #include "window.h" |
33 | #include "termchar.h" | |
34 | #include "termopts.h" | |
35 | #include "disptab.h" | |
5a05d3d2 | 36 | #include "intervals.h" |
0aa01123 | 37 | #include "region-cache.h" |
993b6404 JB |
38 | |
39 | /* Indentation can insert tabs if this is non-zero; | |
88c6e37e GM |
40 | otherwise always uses spaces. */ |
41 | ||
993b6404 JB |
42 | int indent_tabs_mode; |
43 | ||
993b6404 JB |
44 | #define CR 015 |
45 | ||
79c2a4fc | 46 | /* These three values memorize the current column to avoid recalculation. */ |
88c6e37e GM |
47 | |
48 | /* Last value returned by current_column. | |
49 | Some things in set last_known_column_point to -1 | |
79c2a4fc | 50 | to mark the memorized value as invalid. */ |
88c6e37e | 51 | |
76e20cb0 | 52 | double last_known_column; |
88c6e37e GM |
53 | |
54 | /* Value of point when current_column was called. */ | |
55 | ||
993b6404 | 56 | int last_known_column_point; |
88c6e37e GM |
57 | |
58 | /* Value of MODIFF when current_column was called. */ | |
59 | ||
993b6404 JB |
60 | int last_known_column_modified; |
61 | ||
76e20cb0 RS |
62 | static double current_column_1 P_ ((void)); |
63 | static double position_indentation P_ ((int)); | |
82d593eb | 64 | |
a997a7ca KH |
65 | /* Cache of beginning of line found by the last call of |
66 | current_column. */ | |
88c6e37e | 67 | |
a997a7ca KH |
68 | int current_column_bol_cache; |
69 | ||
993b6404 JB |
70 | /* Get the display table to use for the current buffer. */ |
71 | ||
d44f12b4 | 72 | struct Lisp_Char_Table * |
993b6404 JB |
73 | buffer_display_table () |
74 | { | |
75 | Lisp_Object thisbuf; | |
76 | ||
77 | thisbuf = current_buffer->display_table; | |
d44f12b4 RS |
78 | if (DISP_TABLE_P (thisbuf)) |
79 | return XCHAR_TABLE (thisbuf); | |
80 | if (DISP_TABLE_P (Vstandard_display_table)) | |
81 | return XCHAR_TABLE (Vstandard_display_table); | |
993b6404 JB |
82 | return 0; |
83 | } | |
84 | \f | |
0aa01123 JB |
85 | /* Width run cache considerations. */ |
86 | ||
87 | /* Return the width of character C under display table DP. */ | |
f845b8b2 | 88 | |
0aa01123 JB |
89 | static int |
90 | character_width (c, dp) | |
91 | int c; | |
d44f12b4 | 92 | struct Lisp_Char_Table *dp; |
0aa01123 JB |
93 | { |
94 | Lisp_Object elt; | |
95 | ||
96 | /* These width computations were determined by examining the cases | |
97 | in display_text_line. */ | |
98 | ||
f845b8b2 | 99 | /* Everything can be handled by the display table, if it's |
0aa01123 | 100 | present and the element is right. */ |
f845b8b2 | 101 | if (dp && (elt = DISP_CHAR_VECTOR (dp, c), VECTORP (elt))) |
0aa01123 JB |
102 | return XVECTOR (elt)->size; |
103 | ||
f845b8b2 RS |
104 | /* Some characters are special. */ |
105 | if (c == '\n' || c == '\t' || c == '\015') | |
106 | return 0; | |
107 | ||
108 | /* Printing characters have width 1. */ | |
0aa01123 JB |
109 | else if (c >= 040 && c < 0177) |
110 | return 1; | |
111 | ||
112 | /* Everybody else (control characters, metacharacters) has other | |
113 | widths. We could return their actual widths here, but they | |
114 | depend on things like ctl_arrow and crud like that, and they're | |
115 | not very common at all. So we'll just claim we don't know their | |
116 | widths. */ | |
117 | else | |
118 | return 0; | |
119 | } | |
120 | ||
121 | /* Return true iff the display table DISPTAB specifies the same widths | |
122 | for characters as WIDTHTAB. We use this to decide when to | |
123 | invalidate the buffer's width_run_cache. */ | |
88c6e37e | 124 | |
0aa01123 JB |
125 | int |
126 | disptab_matches_widthtab (disptab, widthtab) | |
d44f12b4 | 127 | struct Lisp_Char_Table *disptab; |
0aa01123 JB |
128 | struct Lisp_Vector *widthtab; |
129 | { | |
130 | int i; | |
131 | ||
132 | if (widthtab->size != 256) | |
133 | abort (); | |
134 | ||
135 | for (i = 0; i < 256; i++) | |
136 | if (character_width (i, disptab) | |
137 | != XFASTINT (widthtab->contents[i])) | |
138 | return 0; | |
139 | ||
140 | return 1; | |
2ff4775b | 141 | } |
0aa01123 JB |
142 | |
143 | /* Recompute BUF's width table, using the display table DISPTAB. */ | |
88c6e37e | 144 | |
0aa01123 JB |
145 | void |
146 | recompute_width_table (buf, disptab) | |
147 | struct buffer *buf; | |
d44f12b4 | 148 | struct Lisp_Char_Table *disptab; |
0aa01123 JB |
149 | { |
150 | int i; | |
228a2e1a | 151 | struct Lisp_Vector *widthtab; |
0aa01123 | 152 | |
228a2e1a KH |
153 | if (!VECTORP (buf->width_table)) |
154 | buf->width_table = Fmake_vector (make_number (256), make_number (0)); | |
155 | widthtab = XVECTOR (buf->width_table); | |
0aa01123 JB |
156 | if (widthtab->size != 256) |
157 | abort (); | |
158 | ||
159 | for (i = 0; i < 256; i++) | |
228a2e1a | 160 | XSETFASTINT (widthtab->contents[i], character_width (i, disptab)); |
0aa01123 JB |
161 | } |
162 | ||
163 | /* Allocate or free the width run cache, as requested by the current | |
164 | state of current_buffer's cache_long_line_scans variable. */ | |
88c6e37e | 165 | |
0aa01123 JB |
166 | static void |
167 | width_run_cache_on_off () | |
168 | { | |
a997a7ca KH |
169 | if (NILP (current_buffer->cache_long_line_scans) |
170 | /* And, for the moment, this feature doesn't work on multibyte | |
171 | characters. */ | |
172 | || !NILP (current_buffer->enable_multibyte_characters)) | |
0aa01123 JB |
173 | { |
174 | /* It should be off. */ | |
175 | if (current_buffer->width_run_cache) | |
176 | { | |
177 | free_region_cache (current_buffer->width_run_cache); | |
178 | current_buffer->width_run_cache = 0; | |
179 | current_buffer->width_table = Qnil; | |
180 | } | |
181 | } | |
182 | else | |
183 | { | |
184 | /* It should be on. */ | |
185 | if (current_buffer->width_run_cache == 0) | |
2ff4775b | 186 | { |
0aa01123 | 187 | current_buffer->width_run_cache = new_region_cache (); |
0aa01123 JB |
188 | recompute_width_table (current_buffer, buffer_display_table ()); |
189 | } | |
190 | } | |
191 | } | |
192 | ||
193 | \f | |
9a21bb64 RS |
194 | /* Skip some invisible characters starting from POS. |
195 | This includes characters invisible because of text properties | |
196 | and characters invisible because of overlays. | |
197 | ||
198 | If position POS is followed by invisible characters, | |
199 | skip some of them and return the position after them. | |
200 | Otherwise return POS itself. | |
201 | ||
202 | Set *NEXT_BOUNDARY_P to the next position at which | |
203 | it will be necessary to call this function again. | |
204 | ||
205 | Don't scan past TO, and don't set *NEXT_BOUNDARY_P | |
206 | to a value greater than TO. | |
207 | ||
208 | If WINDOW is non-nil, and this buffer is displayed in WINDOW, | |
209 | take account of overlays that apply only in WINDOW. | |
210 | ||
211 | We don't necessarily skip all the invisible characters after POS | |
212 | because that could take a long time. We skip a reasonable number | |
213 | which can be skipped quickly. If there might be more invisible | |
214 | characters immediately following, then *NEXT_BOUNDARY_P | |
215 | will equal the return value. */ | |
216 | ||
8720a429 | 217 | int |
9a21bb64 RS |
218 | skip_invisible (pos, next_boundary_p, to, window) |
219 | int pos; | |
220 | int *next_boundary_p; | |
221 | int to; | |
222 | Lisp_Object window; | |
223 | { | |
2e34157c | 224 | Lisp_Object prop, position, overlay_limit, proplimit; |
9a21bb64 | 225 | Lisp_Object buffer; |
662152dd | 226 | int end, inv_p; |
9a21bb64 RS |
227 | |
228 | XSETFASTINT (position, pos); | |
229 | XSETBUFFER (buffer, current_buffer); | |
230 | ||
231 | /* Give faster response for overlay lookup near POS. */ | |
232 | recenter_overlay_lists (current_buffer, pos); | |
233 | ||
234 | /* We must not advance farther than the next overlay change. | |
235 | The overlay change might change the invisible property; | |
236 | or there might be overlay strings to be displayed there. */ | |
237 | overlay_limit = Fnext_overlay_change (position); | |
238 | /* As for text properties, this gives a lower bound | |
239 | for where the invisible text property could change. */ | |
240 | proplimit = Fnext_property_change (position, buffer, Qt); | |
241 | if (XFASTINT (overlay_limit) < XFASTINT (proplimit)) | |
242 | proplimit = overlay_limit; | |
243 | /* PROPLIMIT is now a lower bound for the next change | |
244 | in invisible status. If that is plenty far away, | |
245 | use that lower bound. */ | |
246 | if (XFASTINT (proplimit) > pos + 100 || XFASTINT (proplimit) >= to) | |
247 | *next_boundary_p = XFASTINT (proplimit); | |
248 | /* Otherwise, scan for the next `invisible' property change. */ | |
249 | else | |
250 | { | |
251 | /* Don't scan terribly far. */ | |
252 | XSETFASTINT (proplimit, min (pos + 100, to)); | |
253 | /* No matter what. don't go past next overlay change. */ | |
254 | if (XFASTINT (overlay_limit) < XFASTINT (proplimit)) | |
255 | proplimit = overlay_limit; | |
2e34157c RS |
256 | end = XFASTINT (Fnext_single_property_change (position, Qinvisible, |
257 | buffer, proplimit)); | |
fe0066f5 | 258 | #if 0 |
a997a7ca KH |
259 | /* Don't put the boundary in the middle of multibyte form if |
260 | there is no actual property change. */ | |
261 | if (end == pos + 100 | |
262 | && !NILP (current_buffer->enable_multibyte_characters) | |
263 | && end < ZV) | |
264 | while (pos < end && !CHAR_HEAD_P (POS_ADDR (end))) | |
265 | end--; | |
fe0066f5 | 266 | #endif |
2e34157c | 267 | *next_boundary_p = end; |
9a21bb64 RS |
268 | } |
269 | /* if the `invisible' property is set, we can skip to | |
270 | the next property change */ | |
662152dd SM |
271 | prop = Fget_char_property (position, Qinvisible, |
272 | (!NILP (window) | |
273 | && EQ (XWINDOW (window)->buffer, buffer)) | |
274 | ? window : buffer); | |
275 | inv_p = TEXT_PROP_MEANS_INVISIBLE (prop); | |
276 | /* When counting columns (window == nil), don't skip over ellipsis text. */ | |
277 | if (NILP (window) ? inv_p == 1 : inv_p) | |
9a21bb64 RS |
278 | return *next_boundary_p; |
279 | return pos; | |
280 | } | |
281 | \f | |
012fd715 | 282 | /* If a composition starts at POS/POS_BYTE and it doesn't stride over |
703af3d5 | 283 | POINT, set *LEN / *LEN_BYTE to the character and byte lengths, *WIDTH |
012fd715 KH |
284 | to the width, and return 1. Otherwise, return 0. */ |
285 | ||
286 | static int | |
287 | check_composition (pos, pos_byte, point, len, len_byte, width) | |
288 | int pos, pos_byte, point; | |
289 | int *len, *len_byte, *width; | |
290 | { | |
291 | Lisp_Object prop; | |
292 | int start, end; | |
293 | int id; | |
294 | ||
295 | if (! find_composition (pos, -1, &start, &end, &prop, Qnil) | |
9ee6df62 KH |
296 | || pos != start || point < end |
297 | || !COMPOSITION_VALID_P (start, end, prop)) | |
012fd715 KH |
298 | return 0; |
299 | if ((id = get_composition_id (pos, pos_byte, end - pos, prop, Qnil)) < 0) | |
300 | return 0; | |
301 | ||
302 | *len = COMPOSITION_LENGTH (prop); | |
303 | *len_byte = CHAR_TO_BYTE (end) - pos_byte; | |
304 | *width = composition_table[id]->width; | |
305 | return 1; | |
306 | } | |
307 | \f | |
c9c0f7cf KH |
308 | /* Set variables WIDTH and BYTES for a multibyte sequence starting at P. |
309 | ||
c9c0f7cf KH |
310 | DP is a display table or NULL. |
311 | ||
312 | This macro is used in current_column_1, Fmove_to_column, and | |
313 | compute_motion. */ | |
314 | ||
012fd715 KH |
315 | #define MULTIBYTE_BYTES_WIDTH(p, dp) \ |
316 | do { \ | |
317 | int c; \ | |
318 | \ | |
319 | wide_column = 0; \ | |
320 | c = STRING_CHAR_AND_LENGTH (p, MAX_MULTIBYTE_LENGTH, bytes); \ | |
321 | if (BYTES_BY_CHAR_HEAD (*p) != bytes) \ | |
322 | width = bytes * 4; \ | |
323 | else \ | |
324 | { \ | |
325 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) \ | |
326 | width = XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; \ | |
327 | else \ | |
328 | width = WIDTH_BY_CHAR_HEAD (*p); \ | |
329 | if (width > 1) \ | |
330 | wide_column = width; \ | |
331 | } \ | |
c9c0f7cf KH |
332 | } while (0) |
333 | ||
097812fb | 334 | |
993b6404 | 335 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, |
8c1a1077 PJ |
336 | doc: /* Return the horizontal position of point. Beginning of line is column 0. |
337 | This is calculated by adding together the widths of all the displayed | |
338 | representations of the character between the start of the previous line | |
339 | and point. (eg control characters will have a width of 2 or 4, tabs | |
340 | will have a variable width) | |
341 | Ignores finite width of frame, which means that this function may return | |
342 | values greater than (frame-width). | |
343 | Whether the line is visible (if `selective-display' is t) has no effect; | |
344 | however, ^M is treated as end of line when `selective-display' is t. */) | |
345 | () | |
993b6404 JB |
346 | { |
347 | Lisp_Object temp; | |
097812fb | 348 | XSETFASTINT (temp, (int) current_column ()); /* iftc */ |
993b6404 JB |
349 | return temp; |
350 | } | |
351 | ||
e74928fc JB |
352 | /* Cancel any recorded value of the horizontal position. */ |
353 | ||
c9667ae1 | 354 | void |
e74928fc JB |
355 | invalidate_current_column () |
356 | { | |
357 | last_known_column_point = 0; | |
358 | } | |
359 | ||
76e20cb0 | 360 | double |
993b6404 JB |
361 | current_column () |
362 | { | |
363 | register int col; | |
364 | register unsigned char *ptr, *stop; | |
365 | register int tab_seen; | |
366 | int post_tab; | |
367 | register int c; | |
368 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 369 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 370 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
993b6404 | 371 | |
6ec8bbd2 | 372 | if (PT == last_known_column_point |
993b6404 JB |
373 | && MODIFF == last_known_column_modified) |
374 | return last_known_column; | |
375 | ||
813b81b3 RS |
376 | /* If the buffer has overlays, text properties, |
377 | or multibyte characters, use a more general algorithm. */ | |
9a21bb64 | 378 | if (BUF_INTERVALS (current_buffer) |
3ea2f6f3 SM |
379 | || current_buffer->overlays_before |
380 | || current_buffer->overlays_after | |
813b81b3 RS |
381 | || Z != Z_BYTE) |
382 | return current_column_1 (); | |
9a21bb64 RS |
383 | |
384 | /* Scan backwards from point to the previous newline, | |
385 | counting width. Tab characters are the only complicated case. */ | |
386 | ||
993b6404 | 387 | /* Make a pointer for decrementing through the chars before point. */ |
fe0066f5 | 388 | ptr = BYTE_POS_ADDR (PT_BYTE - 1) + 1; |
993b6404 JB |
389 | /* Make a pointer to where consecutive chars leave off, |
390 | going backwards from point. */ | |
6ec8bbd2 | 391 | if (PT == BEGV) |
993b6404 | 392 | stop = ptr; |
6ec8bbd2 | 393 | else if (PT <= GPT || BEGV > GPT) |
993b6404 JB |
394 | stop = BEGV_ADDR; |
395 | else | |
396 | stop = GAP_END_ADDR; | |
397 | ||
88c6e37e GM |
398 | if (tab_width <= 0 || tab_width > 1000) |
399 | tab_width = 8; | |
993b6404 JB |
400 | |
401 | col = 0, tab_seen = 0, post_tab = 0; | |
402 | ||
403 | while (1) | |
404 | { | |
88c6e37e GM |
405 | EMACS_INT i, n; |
406 | Lisp_Object charvec; | |
097812fb | 407 | |
993b6404 JB |
408 | if (ptr == stop) |
409 | { | |
410 | /* We stopped either for the beginning of the buffer | |
411 | or for the gap. */ | |
412 | if (ptr == BEGV_ADDR) | |
413 | break; | |
097812fb | 414 | |
993b6404 JB |
415 | /* It was the gap. Jump back over it. */ |
416 | stop = BEGV_ADDR; | |
417 | ptr = GPT_ADDR; | |
097812fb | 418 | |
993b6404 | 419 | /* Check whether that brings us to beginning of buffer. */ |
88c6e37e GM |
420 | if (BEGV >= GPT) |
421 | break; | |
993b6404 JB |
422 | } |
423 | ||
424 | c = *--ptr; | |
097812fb | 425 | |
88c6e37e | 426 | if (dp && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
7050d530 | 427 | { |
88c6e37e GM |
428 | charvec = DISP_CHAR_VECTOR (dp, c); |
429 | n = ASIZE (charvec); | |
7050d530 | 430 | } |
88c6e37e | 431 | else |
993b6404 | 432 | { |
88c6e37e GM |
433 | charvec = Qnil; |
434 | n = 1; | |
435 | } | |
097812fb | 436 | |
88c6e37e GM |
437 | for (i = n - 1; i >= 0; --i) |
438 | { | |
439 | if (VECTORP (charvec)) | |
440 | { | |
441 | /* This should be handled the same as | |
442 | next_element_from_display_vector does it. */ | |
443 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 444 | |
88c6e37e GM |
445 | if (INTEGERP (entry) |
446 | && GLYPH_CHAR_VALID_P (XFASTINT (entry))) | |
447 | c = FAST_GLYPH_CHAR (XFASTINT (entry)); | |
448 | else | |
449 | c = ' '; | |
450 | } | |
097812fb | 451 | |
88c6e37e GM |
452 | if (c >= 040 && c < 0177) |
453 | col++; | |
454 | else if (c == '\n' | |
455 | || (c == '\r' | |
456 | && EQ (current_buffer->selective_display, Qt))) | |
457 | { | |
458 | ptr++; | |
459 | goto start_of_line_found; | |
460 | } | |
461 | else if (c == '\t') | |
462 | { | |
463 | if (tab_seen) | |
464 | col = ((col + tab_width) / tab_width) * tab_width; | |
097812fb | 465 | |
88c6e37e GM |
466 | post_tab += col; |
467 | col = 0; | |
468 | tab_seen = 1; | |
469 | } | |
f1004faf GM |
470 | else if (VECTORP (charvec)) |
471 | /* With a display table entry, C is displayed as is, and | |
472 | not displayed as \NNN or as ^N. If C is a single-byte | |
473 | character, it takes one column. If C is multi-byte in | |
474 | an unibyte buffer, it's translated to unibyte, so it | |
475 | also takes one column. */ | |
476 | ++col; | |
88c6e37e GM |
477 | else |
478 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
993b6404 | 479 | } |
993b6404 JB |
480 | } |
481 | ||
88c6e37e GM |
482 | start_of_line_found: |
483 | ||
993b6404 JB |
484 | if (tab_seen) |
485 | { | |
486 | col = ((col + tab_width) / tab_width) * tab_width; | |
487 | col += post_tab; | |
488 | } | |
489 | ||
a997a7ca KH |
490 | if (ptr == BEGV_ADDR) |
491 | current_column_bol_cache = BEGV; | |
492 | else | |
fe0066f5 RS |
493 | current_column_bol_cache = BYTE_TO_CHAR (PTR_BYTE_POS (ptr)); |
494 | ||
993b6404 | 495 | last_known_column = col; |
6ec8bbd2 | 496 | last_known_column_point = PT; |
993b6404 JB |
497 | last_known_column_modified = MODIFF; |
498 | ||
499 | return col; | |
500 | } | |
501 | \f | |
9a21bb64 RS |
502 | /* Return the column number of position POS |
503 | by scanning forward from the beginning of the line. | |
504 | This function handles characters that are invisible | |
505 | due to text properties or overlays. */ | |
506 | ||
76e20cb0 | 507 | static double |
813b81b3 | 508 | current_column_1 () |
9a21bb64 RS |
509 | { |
510 | register int tab_width = XINT (current_buffer->tab_width); | |
511 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); | |
512 | register struct Lisp_Char_Table *dp = buffer_display_table (); | |
fe0066f5 | 513 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
9a21bb64 RS |
514 | |
515 | /* Start the scan at the beginning of this line with column number 0. */ | |
516 | register int col = 0; | |
fe0066f5 | 517 | int scan, scan_byte; |
58b1103e | 518 | int next_boundary; |
fe0066f5 RS |
519 | int opoint = PT, opoint_byte = PT_BYTE; |
520 | ||
813b81b3 | 521 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); |
fe0066f5 RS |
522 | current_column_bol_cache = PT; |
523 | scan = PT, scan_byte = PT_BYTE; | |
524 | SET_PT_BOTH (opoint, opoint_byte); | |
525 | next_boundary = scan; | |
9a21bb64 RS |
526 | |
527 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
528 | ||
529 | /* Scan forward to the target position. */ | |
813b81b3 | 530 | while (scan < opoint) |
9a21bb64 RS |
531 | { |
532 | int c; | |
533 | ||
534 | /* Occasionally we may need to skip invisible text. */ | |
535 | while (scan == next_boundary) | |
536 | { | |
fe0066f5 | 537 | int old_scan = scan; |
9a21bb64 RS |
538 | /* This updates NEXT_BOUNDARY to the next place |
539 | where we might need to skip more invisible text. */ | |
813b81b3 RS |
540 | scan = skip_invisible (scan, &next_boundary, opoint, Qnil); |
541 | if (scan >= opoint) | |
9a21bb64 | 542 | goto endloop; |
fe0066f5 RS |
543 | if (scan != old_scan) |
544 | scan_byte = CHAR_TO_BYTE (scan); | |
9a21bb64 RS |
545 | } |
546 | ||
012fd715 KH |
547 | /* Check composition sequence. */ |
548 | { | |
549 | int len, len_byte, width; | |
550 | ||
551 | if (check_composition (scan, scan_byte, opoint, | |
552 | &len, &len_byte, &width)) | |
553 | { | |
554 | scan += len; | |
555 | scan_byte += len_byte; | |
556 | if (scan <= opoint) | |
557 | col += width; | |
558 | continue; | |
559 | } | |
560 | } | |
561 | ||
813b81b3 | 562 | c = FETCH_BYTE (scan_byte); |
88c6e37e | 563 | |
c9c0f7cf KH |
564 | if (dp != 0 |
565 | && ! (multibyte && BASE_LEADING_CODE_P (c)) | |
566 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
9a21bb64 | 567 | { |
d6e483a4 RS |
568 | Lisp_Object charvec; |
569 | EMACS_INT i, n; | |
570 | ||
571 | /* This character is displayed using a vector of glyphs. | |
572 | Update the column based on those glyphs. */ | |
573 | ||
88c6e37e GM |
574 | charvec = DISP_CHAR_VECTOR (dp, c); |
575 | n = ASIZE (charvec); | |
88c6e37e | 576 | |
d6e483a4 | 577 | for (i = 0; i < n; i++) |
88c6e37e GM |
578 | { |
579 | /* This should be handled the same as | |
580 | next_element_from_display_vector does it. */ | |
d6e483a4 RS |
581 | Lisp_Object entry; |
582 | entry = AREF (charvec, i); | |
583 | ||
88c6e37e GM |
584 | if (INTEGERP (entry) |
585 | && GLYPH_CHAR_VALID_P (XFASTINT (entry))) | |
586 | c = FAST_GLYPH_CHAR (XFASTINT (entry)); | |
587 | else | |
588 | c = ' '; | |
d6e483a4 RS |
589 | |
590 | if (c == '\n') | |
591 | goto endloop; | |
592 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
593 | goto endloop; | |
594 | if (c == '\t') | |
595 | { | |
d6e483a4 RS |
596 | col += tab_width; |
597 | col = col / tab_width * tab_width; | |
598 | } | |
599 | else | |
600 | ++col; | |
88c6e37e | 601 | } |
d6e483a4 RS |
602 | } |
603 | else | |
604 | { | |
605 | /* The display table says nothing for this character. | |
606 | Display it as itself. */ | |
607 | ||
88c6e37e GM |
608 | if (c == '\n') |
609 | goto endloop; | |
610 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
611 | goto endloop; | |
88c6e37e GM |
612 | if (c == '\t') |
613 | { | |
88c6e37e GM |
614 | col += tab_width; |
615 | col = col / tab_width * tab_width; | |
616 | } | |
617 | else if (multibyte && BASE_LEADING_CODE_P (c)) | |
618 | { | |
619 | unsigned char *ptr; | |
620 | int bytes, width, wide_column; | |
097812fb | 621 | |
88c6e37e GM |
622 | ptr = BYTE_POS_ADDR (scan_byte); |
623 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
624 | scan_byte += bytes; | |
36974b5e RS |
625 | /* Subtract one to compensate for the increment |
626 | that is going to happen below. */ | |
627 | scan_byte--; | |
88c6e37e GM |
628 | col += width; |
629 | } | |
630 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
631 | col += 2; | |
632 | else if (c < 040 || c >= 0177) | |
633 | col += 4; | |
634 | else | |
635 | col++; | |
a997a7ca | 636 | } |
d6e483a4 RS |
637 | scan++; |
638 | scan_byte++; | |
639 | ||
9a21bb64 RS |
640 | } |
641 | endloop: | |
642 | ||
643 | last_known_column = col; | |
6ec8bbd2 | 644 | last_known_column_point = PT; |
9a21bb64 RS |
645 | last_known_column_modified = MODIFF; |
646 | ||
647 | return col; | |
648 | } | |
649 | \f | |
f4a6687d GM |
650 | |
651 | #if 0 /* Not used. */ | |
652 | ||
c412c808 RS |
653 | /* Return the width in columns of the part of STRING from BEG to END. |
654 | If BEG is nil, that stands for the beginning of STRING. | |
655 | If END is nil, that stands for the end of STRING. */ | |
656 | ||
76e20cb0 | 657 | static double |
382ac0bd | 658 | string_display_width (string, beg, end) |
c412c808 RS |
659 | Lisp_Object string, beg, end; |
660 | { | |
661 | register int col; | |
662 | register unsigned char *ptr, *stop; | |
663 | register int tab_seen; | |
664 | int post_tab; | |
665 | register int c; | |
666 | register int tab_width = XINT (current_buffer->tab_width); | |
667 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); | |
d44f12b4 | 668 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
c412c808 RS |
669 | int b, e; |
670 | ||
671 | if (NILP (end)) | |
d5db4077 | 672 | e = SCHARS (string); |
c412c808 RS |
673 | else |
674 | { | |
b7826503 | 675 | CHECK_NUMBER (end); |
c412c808 RS |
676 | e = XINT (end); |
677 | } | |
678 | ||
679 | if (NILP (beg)) | |
680 | b = 0; | |
681 | else | |
682 | { | |
b7826503 | 683 | CHECK_NUMBER (beg); |
c412c808 RS |
684 | b = XINT (beg); |
685 | } | |
686 | ||
687 | /* Make a pointer for decrementing through the chars before point. */ | |
d5db4077 | 688 | ptr = SDATA (string) + e; |
c412c808 RS |
689 | /* Make a pointer to where consecutive chars leave off, |
690 | going backwards from point. */ | |
d5db4077 | 691 | stop = SDATA (string) + b; |
c412c808 RS |
692 | |
693 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
694 | ||
695 | col = 0, tab_seen = 0, post_tab = 0; | |
696 | ||
697 | while (1) | |
698 | { | |
699 | if (ptr == stop) | |
700 | break; | |
701 | ||
702 | c = *--ptr; | |
703 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
704 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
705 | else if (c >= 040 && c < 0177) | |
706 | col++; | |
707 | else if (c == '\n') | |
708 | break; | |
709 | else if (c == '\t') | |
710 | { | |
711 | if (tab_seen) | |
712 | col = ((col + tab_width) / tab_width) * tab_width; | |
713 | ||
714 | post_tab += col; | |
715 | col = 0; | |
716 | tab_seen = 1; | |
717 | } | |
718 | else | |
719 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
720 | } | |
721 | ||
722 | if (tab_seen) | |
723 | { | |
724 | col = ((col + tab_width) / tab_width) * tab_width; | |
725 | col += post_tab; | |
726 | } | |
727 | ||
728 | return col; | |
729 | } | |
f4a6687d GM |
730 | |
731 | #endif /* 0 */ | |
732 | ||
c412c808 | 733 | \f |
993b6404 | 734 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
8c1a1077 PJ |
735 | doc: /* Indent from point with tabs and spaces until COLUMN is reached. |
736 | Optional second argument MININUM says always do at least MININUM spaces | |
737 | even if that goes past COLUMN; by default, MININUM is zero. */) | |
738 | (column, minimum) | |
04c98432 | 739 | Lisp_Object column, minimum; |
993b6404 JB |
740 | { |
741 | int mincol; | |
742 | register int fromcol; | |
743 | register int tab_width = XINT (current_buffer->tab_width); | |
744 | ||
b7826503 | 745 | CHECK_NUMBER (column); |
56a98455 | 746 | if (NILP (minimum)) |
94d92e9c | 747 | XSETFASTINT (minimum, 0); |
b7826503 | 748 | CHECK_NUMBER (minimum); |
993b6404 JB |
749 | |
750 | fromcol = current_column (); | |
751 | mincol = fromcol + XINT (minimum); | |
04c98432 | 752 | if (mincol < XINT (column)) mincol = XINT (column); |
993b6404 JB |
753 | |
754 | if (fromcol == mincol) | |
755 | return make_number (mincol); | |
756 | ||
ccdcf1f5 | 757 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
758 | |
759 | if (indent_tabs_mode) | |
760 | { | |
761 | Lisp_Object n; | |
94d92e9c | 762 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
763 | if (XFASTINT (n) != 0) |
764 | { | |
6d1bd1a5 | 765 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
766 | |
767 | fromcol = (mincol / tab_width) * tab_width; | |
768 | } | |
769 | } | |
770 | ||
04c98432 EN |
771 | XSETFASTINT (column, mincol - fromcol); |
772 | Finsert_char (make_number (' '), column, Qt); | |
993b6404 JB |
773 | |
774 | last_known_column = mincol; | |
6ec8bbd2 | 775 | last_known_column_point = PT; |
993b6404 JB |
776 | last_known_column_modified = MODIFF; |
777 | ||
04c98432 EN |
778 | XSETINT (column, mincol); |
779 | return column; | |
993b6404 | 780 | } |
0aa01123 | 781 | |
993b6404 | 782 | \f |
76e20cb0 | 783 | static double position_indentation P_ ((int)); |
dfcf069d | 784 | |
993b6404 | 785 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, |
8c1a1077 PJ |
786 | 0, 0, 0, |
787 | doc: /* Return the indentation of the current line. | |
788 | This is the horizontal position of the character | |
789 | following any initial whitespace. */) | |
790 | () | |
993b6404 JB |
791 | { |
792 | Lisp_Object val; | |
fe0066f5 RS |
793 | int opoint = PT, opoint_byte = PT_BYTE; |
794 | ||
795 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); | |
993b6404 | 796 | |
097812fb | 797 | XSETFASTINT (val, (int) position_indentation (PT_BYTE)); /* iftc */ |
fe0066f5 | 798 | SET_PT_BOTH (opoint, opoint_byte); |
993b6404 JB |
799 | return val; |
800 | } | |
801 | ||
76e20cb0 | 802 | static double |
fe0066f5 RS |
803 | position_indentation (pos_byte) |
804 | register int pos_byte; | |
993b6404 JB |
805 | { |
806 | register int column = 0; | |
807 | register int tab_width = XINT (current_buffer->tab_width); | |
808 | register unsigned char *p; | |
809 | register unsigned char *stop; | |
9a21bb64 | 810 | unsigned char *start; |
fe0066f5 RS |
811 | int next_boundary_byte = pos_byte; |
812 | int ceiling = next_boundary_byte; | |
2ff4775b | 813 | |
ccdcf1f5 | 814 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
2ff4775b | 815 | |
fe0066f5 | 816 | p = BYTE_POS_ADDR (pos_byte); |
9a21bb64 RS |
817 | /* STOP records the value of P at which we will need |
818 | to think about the gap, or about invisible text, | |
819 | or about the end of the buffer. */ | |
820 | stop = p; | |
821 | /* START records the starting value of P. */ | |
822 | start = p; | |
993b6404 JB |
823 | while (1) |
824 | { | |
825 | while (p == stop) | |
826 | { | |
fe0066f5 | 827 | int stop_pos_byte; |
9a21bb64 | 828 | |
fe0066f5 RS |
829 | /* If we have updated P, set POS_BYTE to match. |
830 | The first time we enter the loop, POS_BYTE is already right. */ | |
9a21bb64 | 831 | if (p != start) |
fe0066f5 | 832 | pos_byte = PTR_BYTE_POS (p); |
9a21bb64 | 833 | /* Consider the various reasons STOP might have been set here. */ |
fe0066f5 | 834 | if (pos_byte == ZV_BYTE) |
993b6404 | 835 | return column; |
fe0066f5 RS |
836 | if (pos_byte == next_boundary_byte) |
837 | { | |
838 | int next_boundary; | |
839 | int pos = BYTE_TO_CHAR (pos_byte); | |
840 | pos = skip_invisible (pos, &next_boundary, ZV, Qnil); | |
841 | pos_byte = CHAR_TO_BYTE (pos); | |
842 | next_boundary_byte = CHAR_TO_BYTE (next_boundary); | |
843 | } | |
844 | if (pos_byte >= ceiling) | |
845 | ceiling = BUFFER_CEILING_OF (pos_byte) + 1; | |
9a21bb64 RS |
846 | /* Compute the next place we need to stop and think, |
847 | and set STOP accordingly. */ | |
fe0066f5 | 848 | stop_pos_byte = min (ceiling, next_boundary_byte); |
9a21bb64 | 849 | /* The -1 and +1 arrange to point at the first byte of gap |
fe0066f5 | 850 | (if STOP_POS_BYTE is the position of the gap) |
9a21bb64 | 851 | rather than at the data after the gap. */ |
097812fb | 852 | |
fe0066f5 RS |
853 | stop = BYTE_POS_ADDR (stop_pos_byte - 1) + 1; |
854 | p = BYTE_POS_ADDR (pos_byte); | |
993b6404 JB |
855 | } |
856 | switch (*p++) | |
857 | { | |
fb911777 KH |
858 | case 0240: |
859 | if (! NILP (current_buffer->enable_multibyte_characters)) | |
860 | return column; | |
993b6404 JB |
861 | case ' ': |
862 | column++; | |
863 | break; | |
864 | case '\t': | |
865 | column += tab_width - column % tab_width; | |
866 | break; | |
867 | default: | |
fb911777 KH |
868 | if (ASCII_BYTE_P (p[-1]) |
869 | || NILP (current_buffer->enable_multibyte_characters)) | |
870 | return column; | |
871 | { | |
fe0066f5 RS |
872 | int c; |
873 | pos_byte = PTR_BYTE_POS (p - 1); | |
874 | c = FETCH_MULTIBYTE_CHAR (pos_byte); | |
fb911777 KH |
875 | if (CHAR_HAS_CATEGORY (c, ' ')) |
876 | { | |
877 | column++; | |
fe0066f5 RS |
878 | INC_POS (pos_byte); |
879 | p = BYTE_POS_ADDR (pos_byte); | |
fb911777 KH |
880 | } |
881 | else | |
882 | return column; | |
883 | } | |
993b6404 JB |
884 | } |
885 | } | |
886 | } | |
1b15e576 KH |
887 | |
888 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
889 | Blank lines are treated as if they had the same indentation as the | |
890 | preceding line. */ | |
fe0066f5 | 891 | |
1b15e576 | 892 | int |
fe0066f5 | 893 | indented_beyond_p (pos, pos_byte, column) |
097812fb | 894 | int pos, pos_byte; |
76e20cb0 | 895 | double column; |
1b15e576 | 896 | { |
76e20cb0 | 897 | double val; |
fe0066f5 RS |
898 | int opoint = PT, opoint_byte = PT_BYTE; |
899 | ||
900 | SET_PT_BOTH (pos, pos_byte); | |
901 | while (PT > BEGV && FETCH_BYTE (PT_BYTE) == '\n') | |
902 | scan_newline (PT - 1, PT_BYTE - 1, BEGV, BEGV_BYTE, -1, 0); | |
903 | ||
d5d6f706 | 904 | val = position_indentation (PT_BYTE); |
fe0066f5 | 905 | SET_PT_BOTH (opoint, opoint_byte); |
097812fb | 906 | return val >= column; /* hmm, float comparison */ |
1b15e576 | 907 | } |
993b6404 | 908 | \f |
782d260e | 909 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, "p", |
8c1a1077 PJ |
910 | doc: /* Move point to column COLUMN in the current line. |
911 | The column of a character is calculated by adding together the widths | |
912 | as displayed of the previous characters in the line. | |
913 | This function ignores line-continuation; | |
914 | there is no upper limit on the column number a character can have | |
915 | and horizontal scrolling has no effect. | |
916 | ||
917 | If specified column is within a character, point goes after that character. | |
918 | If it's past end of line, point goes to end of line. | |
919 | ||
920 | A non-nil second (optional) argument FORCE means, | |
921 | if COLUMN is in the middle of a tab character, change it to spaces. | |
922 | In addition, if FORCE is t, and the line is too short | |
923 | to reach column COLUMN, add spaces/tabs to get there. | |
924 | ||
925 | The return value is the current column. */) | |
926 | (column, force) | |
993b6404 JB |
927 | Lisp_Object column, force; |
928 | { | |
929 | register int pos; | |
930 | register int col = current_column (); | |
931 | register int goal; | |
932 | register int end; | |
933 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 934 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 935 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
a997a7ca | 936 | register int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
993b6404 JB |
937 | |
938 | Lisp_Object val; | |
6bbd7a29 GM |
939 | int prev_col = 0; |
940 | int c = 0; | |
58b1103e | 941 | int next_boundary, pos_byte; |
fe0066f5 | 942 | |
ccdcf1f5 | 943 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
b7826503 | 944 | CHECK_NATNUM (column); |
993b6404 JB |
945 | goal = XINT (column); |
946 | ||
6ec8bbd2 | 947 | pos = PT; |
fe0066f5 | 948 | pos_byte = PT_BYTE; |
993b6404 | 949 | end = ZV; |
9a21bb64 | 950 | next_boundary = pos; |
993b6404 JB |
951 | |
952 | /* If we're starting past the desired column, | |
953 | back up to beginning of line and scan from there. */ | |
954 | if (col > goal) | |
955 | { | |
9a21bb64 | 956 | end = pos; |
a997a7ca | 957 | pos = current_column_bol_cache; |
fe0066f5 | 958 | pos_byte = CHAR_TO_BYTE (pos); |
993b6404 JB |
959 | col = 0; |
960 | } | |
961 | ||
8861f16f | 962 | while (pos < end) |
993b6404 | 963 | { |
9a21bb64 RS |
964 | while (pos == next_boundary) |
965 | { | |
fe0066f5 | 966 | int prev = pos; |
9a21bb64 | 967 | pos = skip_invisible (pos, &next_boundary, end, Qnil); |
fe0066f5 RS |
968 | if (pos != prev) |
969 | pos_byte = CHAR_TO_BYTE (pos); | |
9a21bb64 RS |
970 | if (pos >= end) |
971 | goto endloop; | |
972 | } | |
973 | ||
8861f16f RS |
974 | /* Test reaching the goal column. We do this after skipping |
975 | invisible characters, so that we put point before the | |
976 | character on which the cursor will appear. */ | |
977 | if (col >= goal) | |
978 | break; | |
979 | ||
012fd715 KH |
980 | /* Check composition sequence. */ |
981 | { | |
982 | int len, len_byte, width; | |
983 | ||
984 | if (check_composition (pos, pos_byte, Z, &len, &len_byte, &width)) | |
985 | { | |
986 | pos += len; | |
987 | pos_byte += len_byte; | |
988 | col += width; | |
989 | continue; | |
990 | } | |
991 | } | |
992 | ||
fe0066f5 | 993 | c = FETCH_BYTE (pos_byte); |
88c6e37e | 994 | |
d6e483a4 RS |
995 | /* See if there is a display table and it relates |
996 | to this character. */ | |
997 | ||
c9c0f7cf KH |
998 | if (dp != 0 |
999 | && ! (multibyte && BASE_LEADING_CODE_P (c)) | |
1000 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
f845b8b2 | 1001 | { |
d6e483a4 RS |
1002 | Lisp_Object charvec; |
1003 | EMACS_INT i, n; | |
1004 | ||
1005 | /* This character is displayed using a vector of glyphs. | |
1006 | Update the position based on those glyphs. */ | |
1007 | ||
88c6e37e GM |
1008 | charvec = DISP_CHAR_VECTOR (dp, c); |
1009 | n = ASIZE (charvec); | |
88c6e37e | 1010 | |
d6e483a4 | 1011 | for (i = 0; i < n; i++) |
88c6e37e GM |
1012 | { |
1013 | /* This should be handled the same as | |
1014 | next_element_from_display_vector does it. */ | |
d6e483a4 RS |
1015 | |
1016 | Lisp_Object entry; | |
1017 | entry = AREF (charvec, i); | |
1018 | ||
88c6e37e GM |
1019 | if (INTEGERP (entry) |
1020 | && GLYPH_CHAR_VALID_P (XFASTINT (entry))) | |
1021 | c = FAST_GLYPH_CHAR (XFASTINT (entry)); | |
1022 | else | |
1023 | c = ' '; | |
d6e483a4 RS |
1024 | |
1025 | if (c == '\n') | |
1026 | goto endloop; | |
1027 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
1028 | goto endloop; | |
1029 | if (c == '\t') | |
1030 | { | |
1031 | prev_col = col; | |
1032 | col += tab_width; | |
1033 | col = col / tab_width * tab_width; | |
1034 | } | |
1035 | else | |
1036 | ++col; | |
88c6e37e | 1037 | } |
d6e483a4 RS |
1038 | } |
1039 | else | |
1040 | { | |
1041 | /* The display table doesn't affect this character; | |
1042 | it displays as itself. */ | |
88c6e37e | 1043 | |
88c6e37e GM |
1044 | if (c == '\n') |
1045 | goto endloop; | |
1046 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
1047 | goto endloop; | |
88c6e37e GM |
1048 | if (c == '\t') |
1049 | { | |
1050 | prev_col = col; | |
1051 | col += tab_width; | |
1052 | col = col / tab_width * tab_width; | |
1053 | } | |
1054 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
1055 | col += 2; | |
1056 | else if (c < 040 || c == 0177) | |
1057 | col += 4; | |
1058 | else if (c < 0177) | |
1059 | col++; | |
1060 | else if (multibyte && BASE_LEADING_CODE_P (c)) | |
1061 | { | |
1062 | /* Start of multi-byte form. */ | |
1063 | unsigned char *ptr; | |
1064 | int bytes, width, wide_column; | |
1065 | ||
88c6e37e GM |
1066 | ptr = BYTE_POS_ADDR (pos_byte); |
1067 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
d6e483a4 | 1068 | pos_byte += bytes - 1; |
88c6e37e GM |
1069 | col += width; |
1070 | } | |
1071 | else | |
1072 | col += 4; | |
a997a7ca | 1073 | } |
d6e483a4 RS |
1074 | |
1075 | pos++; | |
1076 | pos_byte++; | |
993b6404 | 1077 | } |
9a21bb64 | 1078 | endloop: |
993b6404 | 1079 | |
fe0066f5 | 1080 | SET_PT_BOTH (pos, pos_byte); |
993b6404 JB |
1081 | |
1082 | /* If a tab char made us overshoot, change it to spaces | |
1083 | and scan through it again. */ | |
56a98455 | 1084 | if (!NILP (force) && col > goal && c == '\t' && prev_col < goal) |
993b6404 | 1085 | { |
154a424a GM |
1086 | int goal_pt, goal_pt_byte; |
1087 | ||
1088 | /* Insert spaces in front of the tab to reach GOAL. Do this | |
1089 | first so that a marker at the end of the tab gets | |
1090 | adjusted. */ | |
1091 | SET_PT_BOTH (PT - 1, PT_BYTE - 1); | |
1092 | Finsert_char (make_number (' '), make_number (goal - prev_col), Qt); | |
1093 | ||
1094 | /* Now delete the tab, and indent to COL. */ | |
1095 | del_range (PT, PT + 1); | |
1096 | goal_pt = PT; | |
1097 | goal_pt_byte = PT_BYTE; | |
70ee42f7 | 1098 | Findent_to (make_number (col), Qnil); |
154a424a | 1099 | SET_PT_BOTH (goal_pt, goal_pt_byte); |
097812fb | 1100 | |
5a05d3d2 RS |
1101 | /* Set the last_known... vars consistently. */ |
1102 | col = goal; | |
993b6404 JB |
1103 | } |
1104 | ||
1105 | /* If line ends prematurely, add space to the end. */ | |
de4075cf | 1106 | if (col < goal && EQ (force, Qt)) |
230a4cbd | 1107 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
1108 | |
1109 | last_known_column = col; | |
6ec8bbd2 | 1110 | last_known_column_point = PT; |
993b6404 JB |
1111 | last_known_column_modified = MODIFF; |
1112 | ||
94d92e9c | 1113 | XSETFASTINT (val, col); |
993b6404 JB |
1114 | return val; |
1115 | } | |
1116 | \f | |
0aa01123 JB |
1117 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
1118 | ||
993b6404 JB |
1119 | struct position val_compute_motion; |
1120 | ||
1121 | /* Scan the current buffer forward from offset FROM, pretending that | |
1122 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
1123 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
1124 | and return the ending buffer position and screen location. If we |
1125 | can't hit the requested column exactly (because of a tab or other | |
1126 | multi-column character), overshoot. | |
993b6404 | 1127 | |
2ab90d49 KH |
1128 | DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings |
1129 | at FROM. This is the case if FROMVPOS and FROMVPOS came from an | |
1130 | earlier call to compute_motion. The other common case is that FROMHPOS | |
1131 | is zero and FROM is a position that "belongs" at column zero, but might | |
1132 | be shifted by overlay strings; in this case DID_MOTION should be 0. | |
1133 | ||
993b6404 JB |
1134 | WIDTH is the number of columns available to display text; |
1135 | compute_motion uses this to handle continuation lines and such. | |
1136 | HSCROLL is the number of columns not being displayed at the left | |
1137 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
1138 | TAB_OFFSET is the number of columns of the first tab that aren't |
1139 | being displayed, perhaps because of a continuation line or | |
1140 | something. | |
993b6404 JB |
1141 | |
1142 | compute_motion returns a pointer to a struct position. The bufpos | |
1143 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
1144 | and vpos give its cartesian location. prevhpos is the column at |
1145 | which the character before bufpos started, and contin is non-zero | |
1146 | if we reached the current line by continuing the previous. | |
1147 | ||
1148 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
1149 | columns, taking HSCROLL and the truncation glyph at the left margin | |
1150 | into account. That is, beginning-of-line moves you to the hpos | |
1151 | -HSCROLL + (HSCROLL > 0). | |
993b6404 JB |
1152 | |
1153 | For example, to find the buffer position of column COL of line LINE | |
1154 | of a certain window, pass the window's starting location as FROM | |
1155 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
1156 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
1157 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
2ff4775b | 1158 | TOHPOS. |
993b6404 JB |
1159 | |
1160 | When displaying in window w, a typical formula for WIDTH is: | |
1161 | ||
1162 | window_width - 1 | |
a3c87d4e | 1163 | - (has_vertical_scroll_bars |
90022f5a KS |
1164 | ? WINDOW_CONFIG_SCROLL_BAR_COLS (window) |
1165 | : (window_width + window_left != frame_cols)) | |
993b6404 JB |
1166 | |
1167 | where | |
90022f5a KS |
1168 | window_width is XFASTINT (w->total_cols), |
1169 | window_left is XFASTINT (w->left_col), | |
a3c87d4e | 1170 | has_vertical_scroll_bars is |
90022f5a KS |
1171 | WINDOW_HAS_VERTICAL_SCROLL_BAR (window) |
1172 | and frame_cols = FRAME_COLS (XFRAME (window->frame)) | |
993b6404 | 1173 | |
90022f5a KS |
1174 | Or you can let window_box_text_cols do this all for you, and write: |
1175 | window_box_text_cols (w) - 1 | |
fa61c701 JB |
1176 | |
1177 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 1178 | accounts for window borders if the window is split horizontally, and |
1827d036 | 1179 | the scroll bars if they are turned on. */ |
993b6404 JB |
1180 | |
1181 | struct position * | |
2ab90d49 | 1182 | compute_motion (from, fromvpos, fromhpos, did_motion, to, tovpos, tohpos, width, hscroll, tab_offset, win) |
993b6404 | 1183 | int from, fromvpos, fromhpos, to, tovpos, tohpos; |
2ab90d49 | 1184 | int did_motion; |
993b6404 JB |
1185 | register int width; |
1186 | int hscroll, tab_offset; | |
88af3af4 | 1187 | struct window *win; |
993b6404 | 1188 | { |
cde9337b JB |
1189 | register int hpos = fromhpos; |
1190 | register int vpos = fromvpos; | |
1191 | ||
993b6404 | 1192 | register int pos; |
fe0066f5 | 1193 | int pos_byte; |
6bbd7a29 | 1194 | register int c = 0; |
993b6404 | 1195 | register int tab_width = XFASTINT (current_buffer->tab_width); |
56a98455 | 1196 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 1197 | register struct Lisp_Char_Table *dp = window_display_table (win); |
993b6404 | 1198 | int selective |
eeaafd4f | 1199 | = (INTEGERP (current_buffer->selective_display) |
69eaf10d RS |
1200 | ? XINT (current_buffer->selective_display) |
1201 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
993b6404 | 1202 | int selective_rlen |
eeaafd4f | 1203 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
dea4d2e6 | 1204 | ? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0); |
2ab90d49 KH |
1205 | /* The next location where the `invisible' property changes, or an |
1206 | overlay starts or ends. */ | |
1207 | int next_boundary = from; | |
993b6404 | 1208 | |
0aa01123 JB |
1209 | /* For computing runs of characters with similar widths. |
1210 | Invariant: width_run_width is zero, or all the characters | |
2ff4775b | 1211 | from width_run_start to width_run_end have a fixed width of |
0aa01123 JB |
1212 | width_run_width. */ |
1213 | int width_run_start = from; | |
1214 | int width_run_end = from; | |
1215 | int width_run_width = 0; | |
1216 | Lisp_Object *width_table; | |
66c75ca5 | 1217 | Lisp_Object buffer; |
0aa01123 JB |
1218 | |
1219 | /* The next buffer pos where we should consult the width run cache. */ | |
1220 | int next_width_run = from; | |
0e435804 | 1221 | Lisp_Object window; |
0aa01123 | 1222 | |
a997a7ca | 1223 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
c71c19f4 RS |
1224 | /* If previous char scanned was a wide character, |
1225 | this is the column where it ended. Otherwise, this is 0. */ | |
1226 | int wide_column_end_hpos = 0; | |
a997a7ca | 1227 | int prev_pos; /* Previous buffer position. */ |
fe0066f5 | 1228 | int prev_pos_byte; /* Previous buffer position. */ |
357589bf RS |
1229 | int prev_hpos = 0; |
1230 | int prev_vpos = 0; | |
a997a7ca KH |
1231 | int contin_hpos; /* HPOS of last column of continued line. */ |
1232 | int prev_tab_offset; /* Previous tab offset. */ | |
1233 | ||
66c75ca5 | 1234 | XSETBUFFER (buffer, current_buffer); |
0e435804 | 1235 | XSETWINDOW (window, win); |
66c75ca5 | 1236 | |
0aa01123 JB |
1237 | width_run_cache_on_off (); |
1238 | if (dp == buffer_display_table ()) | |
1239 | width_table = (VECTORP (current_buffer->width_table) | |
1240 | ? XVECTOR (current_buffer->width_table)->contents | |
1241 | : 0); | |
1242 | else | |
1243 | /* If the window has its own display table, we can't use the width | |
1244 | run cache, because that's based on the buffer's display table. */ | |
1245 | width_table = 0; | |
1246 | ||
e4500116 GM |
1247 | if (tab_width <= 0 || tab_width > 1000) |
1248 | tab_width = 8; | |
1249 | ||
1250 | immediate_quit = 1; | |
1251 | QUIT; | |
cde9337b | 1252 | |
a997a7ca | 1253 | pos = prev_pos = from; |
fe0066f5 | 1254 | pos_byte = prev_pos_byte = CHAR_TO_BYTE (from); |
a997a7ca KH |
1255 | contin_hpos = 0; |
1256 | prev_tab_offset = tab_offset; | |
2ab90d49 KH |
1257 | while (1) |
1258 | { | |
1259 | while (pos == next_boundary) | |
f75c0f8a | 1260 | { |
fe0066f5 | 1261 | int pos_here = pos; |
98136db3 RS |
1262 | int newpos; |
1263 | ||
f9ba10b0 | 1264 | /* Don't skip invisible if we are already at the margin. */ |
8a00d895 | 1265 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
f9ba10b0 RS |
1266 | { |
1267 | if (contin_hpos && prev_hpos == 0 | |
1268 | && hpos > tohpos | |
1269 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
1270 | { /* Line breaks because we can't put the character at the | |
1271 | previous line any more. It is not the multi-column | |
1272 | character continued in middle. Go back to previous | |
1273 | buffer position, screen position, and set tab offset | |
1274 | to previous value. It's the beginning of the | |
1275 | line. */ | |
1276 | pos = prev_pos; | |
1277 | pos_byte = prev_pos_byte; | |
1278 | hpos = prev_hpos; | |
357589bf | 1279 | vpos = prev_vpos; |
f9ba10b0 RS |
1280 | tab_offset = prev_tab_offset; |
1281 | } | |
1282 | break; | |
1283 | } | |
1284 | ||
2ab90d49 KH |
1285 | /* If the caller says that the screen position came from an earlier |
1286 | call to compute_motion, then we've already accounted for the | |
1287 | overlay strings at point. This is only true the first time | |
1288 | through, so clear the flag after testing it. */ | |
1289 | if (!did_motion) | |
1290 | /* We need to skip past the overlay strings. Currently those | |
a997a7ca | 1291 | strings must not contain TAB; |
2ab90d49 KH |
1292 | if we want to relax that restriction, something will have |
1293 | to be changed here. */ | |
a997a7ca KH |
1294 | { |
1295 | unsigned char *ovstr; | |
1296 | int ovlen = overlay_strings (pos, win, &ovstr); | |
4116deee KH |
1297 | hpos += ((multibyte && ovlen > 0) |
1298 | ? strwidth (ovstr, ovlen) : ovlen); | |
a997a7ca | 1299 | } |
2ab90d49 KH |
1300 | did_motion = 0; |
1301 | ||
1302 | if (pos >= to) | |
1303 | break; | |
66c75ca5 | 1304 | |
9a21bb64 RS |
1305 | /* Advance POS past invisible characters |
1306 | (but not necessarily all that there are here), | |
1307 | and store in next_boundary the next position where | |
1308 | we need to call skip_invisible. */ | |
98136db3 RS |
1309 | newpos = skip_invisible (pos, &next_boundary, to, window); |
1310 | ||
1311 | if (newpos >= to) | |
e8cb089b RS |
1312 | { |
1313 | pos = min (to, newpos); | |
bcfbd63d | 1314 | pos_byte = CHAR_TO_BYTE (pos); |
e8cb089b RS |
1315 | goto after_loop; |
1316 | } | |
98136db3 | 1317 | |
fe0066f5 RS |
1318 | if (newpos != pos_here) |
1319 | { | |
1320 | pos = newpos; | |
1321 | pos_byte = CHAR_TO_BYTE (pos); | |
1322 | } | |
f75c0f8a | 1323 | } |
2ab90d49 KH |
1324 | |
1325 | /* Handle right margin. */ | |
a997a7ca KH |
1326 | /* Note on a wide-column character. |
1327 | ||
1328 | Characters are classified into the following three categories | |
1329 | according to the width (columns occupied on screen). | |
1330 | ||
1331 | (1) single-column character: ex. `a' | |
1332 | (2) multi-column character: ex. `^A', TAB, `\033' | |
1333 | (3) wide-column character: ex. Japanese character, Chinese character | |
1334 | (In the following example, `W_' stands for them.) | |
1335 | ||
1336 | Multi-column characters can be divided around the right margin, | |
1337 | but wide-column characters cannot. | |
1338 | ||
1339 | NOTE: | |
1340 | ||
1341 | (*) The cursor is placed on the next character after the point. | |
1342 | ||
1343 | ---------- | |
1344 | abcdefghi\ | |
1345 | j ^---- next after the point | |
1346 | ^--- next char. after the point. | |
1347 | ---------- | |
1348 | In case of sigle-column character | |
1349 | ||
1350 | ---------- | |
1351 | abcdefgh\\ | |
1352 | 033 ^---- next after the point, next char. after the point. | |
1353 | ---------- | |
1354 | In case of multi-column character | |
1355 | ||
1356 | ---------- | |
1357 | abcdefgh\\ | |
1358 | W_ ^---- next after the point | |
1359 | ^---- next char. after the point. | |
1360 | ---------- | |
097812fb | 1361 | In case of wide-column character |
a997a7ca KH |
1362 | |
1363 | The problem here is continuation at a wide-column character. | |
1364 | In this case, the line may shorter less than WIDTH. | |
1365 | And we find the continuation AFTER it occurs. | |
1366 | ||
1367 | */ | |
1368 | ||
1369 | if (hpos > width) | |
2ab90d49 KH |
1370 | { |
1371 | if (hscroll | |
1372 | || (truncate_partial_width_windows | |
90022f5a | 1373 | && width + 1 < FRAME_COLS (XFRAME (WINDOW_FRAME (win)))) |
2ab90d49 KH |
1374 | || !NILP (current_buffer->truncate_lines)) |
1375 | { | |
529724fe AS |
1376 | /* Truncating: skip to newline, unless we are already past |
1377 | TO (we need to go back below). */ | |
1378 | if (pos <= to) | |
fe0066f5 RS |
1379 | { |
1380 | pos = find_before_next_newline (pos, to, 1); | |
1381 | pos_byte = CHAR_TO_BYTE (pos); | |
529724fe AS |
1382 | hpos = width; |
1383 | /* If we just skipped next_boundary, | |
1384 | loop around in the main while | |
1385 | and handle it. */ | |
1386 | if (pos >= next_boundary) | |
1387 | next_boundary = pos + 1; | |
1388 | prev_hpos = width; | |
357589bf | 1389 | prev_vpos = vpos; |
529724fe | 1390 | prev_tab_offset = tab_offset; |
fe0066f5 | 1391 | } |
2ab90d49 KH |
1392 | } |
1393 | else | |
1394 | { | |
1395 | /* Continuing. */ | |
a997a7ca KH |
1396 | /* Remember the previous value. */ |
1397 | prev_tab_offset = tab_offset; | |
1398 | ||
c9c0f7cf | 1399 | if (wide_column_end_hpos > width) |
a997a7ca KH |
1400 | { |
1401 | hpos -= prev_hpos; | |
1402 | tab_offset += prev_hpos; | |
1403 | } | |
1404 | else | |
1405 | { | |
1406 | tab_offset += width; | |
1407 | hpos -= width; | |
1408 | } | |
1409 | vpos++; | |
1410 | contin_hpos = prev_hpos; | |
1411 | prev_hpos = 0; | |
6cbc951e | 1412 | prev_vpos = vpos; |
2ab90d49 KH |
1413 | } |
1414 | } | |
1415 | ||
1416 | /* Stop if past the target buffer position or screen position. */ | |
33fe7d20 | 1417 | if (pos > to) |
a997a7ca KH |
1418 | { |
1419 | /* Go back to the previous position. */ | |
1420 | pos = prev_pos; | |
fe0066f5 | 1421 | pos_byte = prev_pos_byte; |
a997a7ca | 1422 | hpos = prev_hpos; |
357589bf | 1423 | vpos = prev_vpos; |
a997a7ca KH |
1424 | tab_offset = prev_tab_offset; |
1425 | ||
1426 | /* NOTE on contin_hpos, hpos, and prev_hpos. | |
1427 | ||
1428 | ---------- | |
1429 | abcdefgh\\ | |
1430 | W_ ^---- contin_hpos | |
1431 | | ^----- hpos | |
1432 | \---- prev_hpos | |
1433 | ---------- | |
1434 | */ | |
1435 | ||
1436 | if (contin_hpos && prev_hpos == 0 | |
c9c0f7cf | 1437 | && contin_hpos < width && !wide_column_end_hpos) |
a997a7ca KH |
1438 | { |
1439 | /* Line breaking occurs in the middle of multi-column | |
1440 | character. Go back to previous line. */ | |
1441 | hpos = contin_hpos; | |
1442 | vpos = vpos - 1; | |
1443 | } | |
a997a7ca KH |
1444 | break; |
1445 | } | |
1446 | ||
8a00d895 | 1447 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
33fe7d20 RS |
1448 | { |
1449 | if (contin_hpos && prev_hpos == 0 | |
9129bcc3 KH |
1450 | && hpos > tohpos |
1451 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
33fe7d20 RS |
1452 | { /* Line breaks because we can't put the character at the |
1453 | previous line any more. It is not the multi-column | |
1454 | character continued in middle. Go back to previous | |
1455 | buffer position, screen position, and set tab offset | |
1456 | to previous value. It's the beginning of the | |
1457 | line. */ | |
1458 | pos = prev_pos; | |
1459 | pos_byte = prev_pos_byte; | |
1460 | hpos = prev_hpos; | |
357589bf | 1461 | vpos = prev_vpos; |
33fe7d20 RS |
1462 | tab_offset = prev_tab_offset; |
1463 | } | |
1464 | break; | |
1465 | } | |
a997a7ca | 1466 | if (pos == ZV) /* We cannot go beyond ZV. Stop here. */ |
2ab90d49 KH |
1467 | break; |
1468 | ||
2ab90d49 | 1469 | prev_hpos = hpos; |
357589bf | 1470 | prev_vpos = vpos; |
a997a7ca | 1471 | prev_pos = pos; |
fe0066f5 | 1472 | prev_pos_byte = pos_byte; |
c9c0f7cf | 1473 | wide_column_end_hpos = 0; |
0aa01123 JB |
1474 | |
1475 | /* Consult the width run cache to see if we can avoid inspecting | |
1476 | the text character-by-character. */ | |
1477 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
1478 | { | |
1479 | int run_end; | |
1480 | int common_width | |
1481 | = region_cache_forward (current_buffer, | |
1482 | current_buffer->width_run_cache, | |
1483 | pos, &run_end); | |
1484 | ||
1485 | /* A width of zero means the character's width varies (like | |
1486 | a tab), is meaningless (like a newline), or we just don't | |
1487 | want to skip over it for some other reason. */ | |
1488 | if (common_width != 0) | |
1489 | { | |
1490 | int run_end_hpos; | |
1491 | ||
1492 | /* Don't go past the final buffer posn the user | |
1493 | requested. */ | |
1494 | if (run_end > to) | |
1495 | run_end = to; | |
1496 | ||
1497 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1498 | ||
1499 | /* Don't go past the final horizontal position the user | |
1500 | requested. */ | |
1501 | if (vpos == tovpos && run_end_hpos > tohpos) | |
1502 | { | |
1503 | run_end = pos + (tohpos - hpos) / common_width; | |
1504 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1505 | } | |
2ff4775b | 1506 | |
0aa01123 JB |
1507 | /* Don't go past the margin. */ |
1508 | if (run_end_hpos >= width) | |
1509 | { | |
1510 | run_end = pos + (width - hpos) / common_width; | |
1511 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1512 | } | |
1513 | ||
1514 | hpos = run_end_hpos; | |
1515 | if (run_end > pos) | |
1516 | prev_hpos = hpos - common_width; | |
fe0066f5 RS |
1517 | if (pos != run_end) |
1518 | { | |
1519 | pos = run_end; | |
1520 | pos_byte = CHAR_TO_BYTE (pos); | |
1521 | } | |
0aa01123 JB |
1522 | } |
1523 | ||
1524 | next_width_run = run_end + 1; | |
1525 | } | |
1526 | ||
1527 | /* We have to scan the text character-by-character. */ | |
993b6404 | 1528 | else |
2ab90d49 | 1529 | { |
88c6e37e GM |
1530 | EMACS_INT i, n; |
1531 | Lisp_Object charvec; | |
097812fb | 1532 | |
fe0066f5 | 1533 | c = FETCH_BYTE (pos_byte); |
012fd715 KH |
1534 | |
1535 | /* Check composition sequence. */ | |
1536 | { | |
1537 | int len, len_byte, width; | |
1538 | ||
1539 | if (check_composition (pos, pos_byte, to, &len, &len_byte, &width)) | |
1540 | { | |
1541 | pos += len; | |
1542 | pos_byte += len_byte; | |
1543 | hpos += width; | |
1544 | continue; | |
1545 | } | |
1546 | } | |
1547 | ||
fe0066f5 | 1548 | pos++, pos_byte++; |
0aa01123 | 1549 | |
2ab90d49 KH |
1550 | /* Perhaps add some info to the width_run_cache. */ |
1551 | if (current_buffer->width_run_cache) | |
1552 | { | |
1553 | /* Is this character part of the current run? If so, extend | |
1554 | the run. */ | |
1555 | if (pos - 1 == width_run_end | |
5db0afb7 | 1556 | && XFASTINT (width_table[c]) == width_run_width) |
2ab90d49 KH |
1557 | width_run_end = pos; |
1558 | ||
1559 | /* The previous run is over, since this is a character at a | |
1560 | different position, or a different width. */ | |
1561 | else | |
1562 | { | |
1563 | /* Have we accumulated a run to put in the cache? | |
1564 | (Currently, we only cache runs of width == 1). */ | |
1565 | if (width_run_start < width_run_end | |
1566 | && width_run_width == 1) | |
1567 | know_region_cache (current_buffer, | |
1568 | current_buffer->width_run_cache, | |
1569 | width_run_start, width_run_end); | |
1570 | ||
1571 | /* Start recording a new width run. */ | |
5db0afb7 | 1572 | width_run_width = XFASTINT (width_table[c]); |
2ab90d49 KH |
1573 | width_run_start = pos - 1; |
1574 | width_run_end = pos; | |
1575 | } | |
1576 | } | |
993b6404 | 1577 | |
c9c0f7cf KH |
1578 | if (dp != 0 |
1579 | && ! (multibyte && BASE_LEADING_CODE_P (c)) | |
1580 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
993b6404 | 1581 | { |
88c6e37e GM |
1582 | charvec = DISP_CHAR_VECTOR (dp, c); |
1583 | n = ASIZE (charvec); | |
993b6404 | 1584 | } |
88c6e37e | 1585 | else |
993b6404 | 1586 | { |
88c6e37e GM |
1587 | charvec = Qnil; |
1588 | n = 1; | |
1589 | } | |
1590 | ||
1591 | for (i = n - 1; i >= 0; --i) | |
1592 | { | |
1593 | if (VECTORP (charvec)) | |
2ab90d49 | 1594 | { |
88c6e37e GM |
1595 | /* This should be handled the same as |
1596 | next_element_from_display_vector does it. */ | |
1597 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 1598 | |
88c6e37e GM |
1599 | if (INTEGERP (entry) |
1600 | && GLYPH_CHAR_VALID_P (XFASTINT (entry))) | |
1601 | c = FAST_GLYPH_CHAR (XFASTINT (entry)); | |
1602 | else | |
1603 | c = ' '; | |
1604 | } | |
097812fb | 1605 | |
88c6e37e GM |
1606 | if (c >= 040 && c < 0177) |
1607 | hpos++; | |
1608 | else if (c == '\t') | |
1609 | { | |
1610 | int tem = ((hpos + tab_offset + hscroll - (hscroll > 0)) | |
1611 | % tab_width); | |
1612 | if (tem < 0) | |
1613 | tem += tab_width; | |
1614 | hpos += tab_width - tem; | |
1615 | } | |
1616 | else if (c == '\n') | |
1617 | { | |
1618 | if (selective > 0 | |
097812fb | 1619 | && indented_beyond_p (pos, pos_byte, |
76e20cb0 | 1620 | (double) selective)) /* iftc */ |
2ab90d49 | 1621 | { |
88c6e37e GM |
1622 | /* If (pos == to), we don't have to take care of |
1623 | selective display. */ | |
1624 | if (pos < to) | |
fe0066f5 | 1625 | { |
88c6e37e GM |
1626 | /* Skip any number of invisible lines all at once */ |
1627 | do | |
1628 | { | |
1629 | pos = find_before_next_newline (pos, to, 1); | |
1630 | if (pos < to) | |
1631 | pos++; | |
1632 | pos_byte = CHAR_TO_BYTE (pos); | |
1633 | } | |
1634 | while (pos < to | |
097812fb | 1635 | && indented_beyond_p (pos, pos_byte, |
76e20cb0 | 1636 | (double) selective)); /* iftc */ |
88c6e37e GM |
1637 | /* Allow for the " ..." that is displayed for them. */ |
1638 | if (selective_rlen) | |
1639 | { | |
1640 | hpos += selective_rlen; | |
1641 | if (hpos >= width) | |
1642 | hpos = width; | |
1643 | } | |
1644 | DEC_BOTH (pos, pos_byte); | |
1645 | /* We have skipped the invis text, but not the | |
1646 | newline after. */ | |
fe0066f5 | 1647 | } |
2ab90d49 | 1648 | } |
88c6e37e GM |
1649 | else |
1650 | { | |
1651 | /* A visible line. */ | |
1652 | vpos++; | |
1653 | hpos = 0; | |
1654 | hpos -= hscroll; | |
1655 | /* Count the truncation glyph on column 0 */ | |
1656 | if (hscroll > 0) | |
1657 | hpos++; | |
1658 | tab_offset = 0; | |
1659 | } | |
1660 | contin_hpos = 0; | |
2ab90d49 | 1661 | } |
88c6e37e | 1662 | else if (c == CR && selective < 0) |
fe0066f5 | 1663 | { |
88c6e37e GM |
1664 | /* In selective display mode, |
1665 | everything from a ^M to the end of the line is invisible. | |
1666 | Stop *before* the real newline. */ | |
1667 | if (pos < to) | |
1668 | { | |
1669 | pos = find_before_next_newline (pos, to, 1); | |
1670 | pos_byte = CHAR_TO_BYTE (pos); | |
1671 | } | |
1672 | /* If we just skipped next_boundary, | |
1673 | loop around in the main while | |
1674 | and handle it. */ | |
1675 | if (pos > next_boundary) | |
1676 | next_boundary = pos; | |
1677 | /* Allow for the " ..." that is displayed for them. */ | |
1678 | if (selective_rlen) | |
1679 | { | |
1680 | hpos += selective_rlen; | |
1681 | if (hpos >= width) | |
1682 | hpos = width; | |
1683 | } | |
fe0066f5 | 1684 | } |
88c6e37e | 1685 | else if (multibyte && BASE_LEADING_CODE_P (c)) |
2ab90d49 | 1686 | { |
88c6e37e GM |
1687 | /* Start of multi-byte form. */ |
1688 | unsigned char *ptr; | |
1689 | int bytes, width, wide_column; | |
1690 | ||
1691 | pos_byte--; /* rewind POS_BYTE */ | |
1692 | ptr = BYTE_POS_ADDR (pos_byte); | |
1693 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
1694 | pos_byte += bytes; | |
1695 | if (wide_column) | |
1696 | wide_column_end_hpos = hpos + wide_column; | |
1697 | hpos += width; | |
2ab90d49 | 1698 | } |
f1004faf GM |
1699 | else if (VECTORP (charvec)) |
1700 | ++hpos; | |
88c6e37e GM |
1701 | else |
1702 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
2ab90d49 | 1703 | } |
993b6404 JB |
1704 | } |
1705 | } | |
1706 | ||
98136db3 RS |
1707 | after_loop: |
1708 | ||
0aa01123 JB |
1709 | /* Remember any final width run in the cache. */ |
1710 | if (current_buffer->width_run_cache | |
1711 | && width_run_width == 1 | |
1712 | && width_run_start < width_run_end) | |
1713 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
1714 | width_run_start, width_run_end); | |
1715 | ||
993b6404 | 1716 | val_compute_motion.bufpos = pos; |
fe0066f5 | 1717 | val_compute_motion.bytepos = pos_byte; |
cde9337b JB |
1718 | val_compute_motion.hpos = hpos; |
1719 | val_compute_motion.vpos = vpos; | |
ef3af330 AS |
1720 | if (contin_hpos && prev_hpos == 0) |
1721 | val_compute_motion.prevhpos = contin_hpos; | |
1722 | else | |
1723 | val_compute_motion.prevhpos = prev_hpos; | |
927b5a55 RS |
1724 | /* We alalways handle all of them here; none of them remain to do. */ |
1725 | val_compute_motion.ovstring_chars_done = 0; | |
993b6404 JB |
1726 | |
1727 | /* Nonzero if have just continued a line */ | |
a997a7ca | 1728 | val_compute_motion.contin = (contin_hpos && prev_hpos == 0); |
993b6404 | 1729 | |
e4500116 | 1730 | immediate_quit = 0; |
993b6404 JB |
1731 | return &val_compute_motion; |
1732 | } | |
993b6404 | 1733 | |
8720a429 | 1734 | |
88af3af4 | 1735 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
8c1a1077 PJ |
1736 | doc: /* Scan through the current buffer, calculating screen position. |
1737 | Scan the current buffer forward from offset FROM, | |
1738 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
1739 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
1740 | and return the ending buffer position and screen location. | |
1741 | ||
1742 | There are three additional arguments: | |
1743 | ||
1744 | WIDTH is the number of columns available to display text; | |
1745 | this affects handling of continuation lines. | |
1746 | This is usually the value returned by `window-width', less one (to allow | |
1747 | for the continuation glyph). | |
1748 | ||
1749 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
1750 | HSCROLL is the number of columns not being displayed at the left | |
1751 | margin; this is usually taken from a window's hscroll member. | |
1752 | TAB-OFFSET is the number of columns of the first tab that aren't | |
1753 | being displayed, perhaps because the line was continued within it. | |
1754 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
1755 | ||
1756 | WINDOW is the window to operate on. It is used to choose the display table; | |
1757 | if it is showing the current buffer, it is used also for | |
1758 | deciding which overlay properties apply. | |
1759 | Note that `compute-motion' always operates on the current buffer. | |
1760 | ||
1761 | The value is a list of five elements: | |
1762 | (POS HPOS VPOS PREVHPOS CONTIN) | |
1763 | POS is the buffer position where the scan stopped. | |
1764 | VPOS is the vertical position where the scan stopped. | |
1765 | HPOS is the horizontal position where the scan stopped. | |
1766 | ||
1767 | PREVHPOS is the horizontal position one character back from POS. | |
1768 | CONTIN is t if a line was continued after (or within) the previous character. | |
1769 | ||
1770 | For example, to find the buffer position of column COL of line LINE | |
1771 | of a certain window, pass the window's starting location as FROM | |
1772 | and the window's upper-left coordinates as FROMPOS. | |
1773 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
1774 | visible section of the buffer, and pass LINE and COL as TOPOS. */) | |
1775 | (from, frompos, to, topos, width, offsets, window) | |
42918ba5 | 1776 | Lisp_Object from, frompos, to, topos; |
88af3af4 | 1777 | Lisp_Object width, offsets, window; |
42918ba5 | 1778 | { |
8798a92b | 1779 | Lisp_Object bufpos, hpos, vpos, prevhpos; |
42918ba5 RS |
1780 | struct position *pos; |
1781 | int hscroll, tab_offset; | |
1782 | ||
b7826503 PJ |
1783 | CHECK_NUMBER_COERCE_MARKER (from); |
1784 | CHECK_CONS (frompos); | |
1785 | CHECK_NUMBER_CAR (frompos); | |
1786 | CHECK_NUMBER_CDR (frompos); | |
1787 | CHECK_NUMBER_COERCE_MARKER (to); | |
1788 | CHECK_CONS (topos); | |
1789 | CHECK_NUMBER_CAR (topos); | |
1790 | CHECK_NUMBER_CDR (topos); | |
1791 | CHECK_NUMBER (width); | |
42918ba5 RS |
1792 | if (!NILP (offsets)) |
1793 | { | |
b7826503 PJ |
1794 | CHECK_CONS (offsets); |
1795 | CHECK_NUMBER_CAR (offsets); | |
1796 | CHECK_NUMBER_CDR (offsets); | |
70949dac KR |
1797 | hscroll = XINT (XCAR (offsets)); |
1798 | tab_offset = XINT (XCDR (offsets)); | |
42918ba5 RS |
1799 | } |
1800 | else | |
1801 | hscroll = tab_offset = 0; | |
1802 | ||
88af3af4 KH |
1803 | if (NILP (window)) |
1804 | window = Fselected_window (); | |
1805 | else | |
b7826503 | 1806 | CHECK_LIVE_WINDOW (window); |
88af3af4 | 1807 | |
9fdae274 KH |
1808 | if (XINT (from) < BEGV || XINT (from) > ZV) |
1809 | args_out_of_range_3 (from, make_number (BEGV), make_number (ZV)); | |
1810 | if (XINT (to) < BEGV || XINT (to) > ZV) | |
1811 | args_out_of_range_3 (to, make_number (BEGV), make_number (ZV)); | |
1812 | ||
70949dac KR |
1813 | pos = compute_motion (XINT (from), XINT (XCDR (frompos)), |
1814 | XINT (XCAR (frompos)), 0, | |
1815 | XINT (to), XINT (XCDR (topos)), | |
1816 | XINT (XCAR (topos)), | |
88af3af4 KH |
1817 | XINT (width), hscroll, tab_offset, |
1818 | XWINDOW (window)); | |
42918ba5 | 1819 | |
94d92e9c | 1820 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
1821 | XSETINT (hpos, pos->hpos); |
1822 | XSETINT (vpos, pos->vpos); | |
1823 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
1824 | |
1825 | return Fcons (bufpos, | |
1826 | Fcons (hpos, | |
1827 | Fcons (vpos, | |
1828 | Fcons (prevhpos, | |
1829 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
1830 | ||
1831 | } | |
993b6404 | 1832 | \f |
0aa01123 | 1833 | /* Fvertical_motion and vmotion */ |
88c6e37e | 1834 | |
993b6404 JB |
1835 | struct position val_vmotion; |
1836 | ||
1837 | struct position * | |
99ce22d5 KH |
1838 | vmotion (from, vtarget, w) |
1839 | register int from, vtarget; | |
1840 | struct window *w; | |
993b6404 | 1841 | { |
7b8339b6 | 1842 | int width = window_box_text_cols (w); |
99ce22d5 | 1843 | int hscroll = XINT (w->hscroll); |
993b6404 JB |
1844 | struct position pos; |
1845 | /* vpos is cumulative vertical position, changed as from is changed */ | |
1846 | register int vpos = 0; | |
92992c7e | 1847 | Lisp_Object prevline; |
993b6404 | 1848 | register int first; |
fe0066f5 | 1849 | int from_byte; |
993b6404 JB |
1850 | int lmargin = hscroll > 0 ? 1 - hscroll : 0; |
1851 | int selective | |
eeaafd4f KH |
1852 | = (INTEGERP (current_buffer->selective_display) |
1853 | ? XINT (current_buffer->selective_display) | |
1854 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
99ce22d5 KH |
1855 | Lisp_Object window; |
1856 | int start_hpos = 0; | |
2ab90d49 | 1857 | int did_motion; |
7ac57cb3 RS |
1858 | /* This is the object we use for fetching character properties. */ |
1859 | Lisp_Object text_prop_object; | |
99ce22d5 KH |
1860 | |
1861 | XSETWINDOW (window, w); | |
1862 | ||
7b8339b6 KS |
1863 | /* We must make room for continuation marks if we don't have fringes. */ |
1864 | #ifdef HAVE_WINDOW_SYSTEM | |
1865 | if (!FRAME_WINDOW_P (XFRAME (w->frame))) | |
1866 | #endif | |
1867 | width -= 1; | |
1868 | ||
7ac57cb3 RS |
1869 | /* If the window contains this buffer, use it for getting text properties. |
1870 | Otherwise use the current buffer as arg for doing that. */ | |
1871 | if (EQ (w->buffer, Fcurrent_buffer ())) | |
1872 | text_prop_object = window; | |
1873 | else | |
1874 | text_prop_object = Fcurrent_buffer (); | |
1875 | ||
99ce22d5 | 1876 | if (vpos >= vtarget) |
993b6404 | 1877 | { |
99ce22d5 | 1878 | /* To move upward, go a line at a time until |
fe0066f5 | 1879 | we have gone at least far enough. */ |
99ce22d5 KH |
1880 | |
1881 | first = 1; | |
1882 | ||
1883 | while ((vpos > vtarget || first) && from > BEGV) | |
993b6404 | 1884 | { |
66c75ca5 RS |
1885 | Lisp_Object propval; |
1886 | ||
99ce22d5 | 1887 | XSETFASTINT (prevline, find_next_newline_no_quit (from - 1, -1)); |
92992c7e | 1888 | while (XFASTINT (prevline) > BEGV |
5a05d3d2 | 1889 | && ((selective > 0 |
fe0066f5 RS |
1890 | && indented_beyond_p (XFASTINT (prevline), |
1891 | CHAR_TO_BYTE (XFASTINT (prevline)), | |
76e20cb0 | 1892 | (double) selective)) /* iftc */ |
5a05d3d2 | 1893 | /* watch out for newlines with `invisible' property */ |
66c75ca5 RS |
1894 | || (propval = Fget_char_property (prevline, |
1895 | Qinvisible, | |
7ac57cb3 | 1896 | text_prop_object), |
339ee979 | 1897 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
94d92e9c KH |
1898 | XSETFASTINT (prevline, |
1899 | find_next_newline_no_quit (XFASTINT (prevline) - 1, | |
1900 | -1)); | |
92992c7e | 1901 | pos = *compute_motion (XFASTINT (prevline), 0, |
99ce22d5 | 1902 | lmargin + (XFASTINT (prevline) == BEG |
92992c7e | 1903 | ? start_hpos : 0), |
2ab90d49 | 1904 | 0, |
097812fb | 1905 | from, |
a997a7ca KH |
1906 | /* Don't care for VPOS... */ |
1907 | 1 << (BITS_PER_SHORT - 1), | |
1908 | /* ... nor HPOS. */ | |
1909 | 1 << (BITS_PER_SHORT - 1), | |
2dd4e608 RS |
1910 | width, hscroll, |
1911 | /* This compensates for start_hpos | |
1912 | so that a tab as first character | |
1913 | still occupies 8 columns. */ | |
1914 | (XFASTINT (prevline) == BEG | |
1915 | ? -start_hpos : 0), | |
1916 | w); | |
99ce22d5 KH |
1917 | vpos -= pos.vpos; |
1918 | first = 0; | |
1919 | from = XFASTINT (prevline); | |
993b6404 | 1920 | } |
99ce22d5 KH |
1921 | |
1922 | /* If we made exactly the desired vertical distance, | |
1923 | or if we hit beginning of buffer, | |
1924 | return point found */ | |
1925 | if (vpos >= vtarget) | |
993b6404 | 1926 | { |
99ce22d5 | 1927 | val_vmotion.bufpos = from; |
fe0066f5 | 1928 | val_vmotion.bytepos = CHAR_TO_BYTE (from); |
99ce22d5 KH |
1929 | val_vmotion.vpos = vpos; |
1930 | val_vmotion.hpos = lmargin; | |
1931 | val_vmotion.contin = 0; | |
1932 | val_vmotion.prevhpos = 0; | |
927b5a55 | 1933 | val_vmotion.ovstring_chars_done = 0; |
a997a7ca | 1934 | val_vmotion.tab_offset = 0; /* For accumulating tab offset. */ |
99ce22d5 | 1935 | return &val_vmotion; |
993b6404 | 1936 | } |
993b6404 | 1937 | |
99ce22d5 KH |
1938 | /* Otherwise find the correct spot by moving down */ |
1939 | } | |
1940 | /* Moving downward is simple, but must calculate from beg of line | |
1941 | to determine hpos of starting point */ | |
fe0066f5 RS |
1942 | from_byte = CHAR_TO_BYTE (from); |
1943 | if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n') | |
993b6404 | 1944 | { |
2ab90d49 | 1945 | Lisp_Object propval; |
66c75ca5 | 1946 | |
99ce22d5 KH |
1947 | XSETFASTINT (prevline, find_next_newline_no_quit (from, -1)); |
1948 | while (XFASTINT (prevline) > BEGV | |
1949 | && ((selective > 0 | |
fe0066f5 RS |
1950 | && indented_beyond_p (XFASTINT (prevline), |
1951 | CHAR_TO_BYTE (XFASTINT (prevline)), | |
76e20cb0 | 1952 | (double) selective)) /* iftc */ |
99ce22d5 KH |
1953 | /* watch out for newlines with `invisible' property */ |
1954 | || (propval = Fget_char_property (prevline, Qinvisible, | |
7ac57cb3 | 1955 | text_prop_object), |
339ee979 | 1956 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
99ce22d5 KH |
1957 | XSETFASTINT (prevline, |
1958 | find_next_newline_no_quit (XFASTINT (prevline) - 1, | |
1959 | -1)); | |
92992c7e | 1960 | pos = *compute_motion (XFASTINT (prevline), 0, |
99ce22d5 | 1961 | lmargin + (XFASTINT (prevline) == BEG |
92992c7e | 1962 | ? start_hpos : 0), |
2ab90d49 | 1963 | 0, |
097812fb | 1964 | from, |
a997a7ca KH |
1965 | /* Don't care for VPOS... */ |
1966 | 1 << (BITS_PER_SHORT - 1), | |
1967 | /* ... nor HPOS. */ | |
1968 | 1 << (BITS_PER_SHORT - 1), | |
2dd4e608 RS |
1969 | width, hscroll, |
1970 | (XFASTINT (prevline) == BEG ? -start_hpos : 0), | |
1971 | w); | |
2ab90d49 | 1972 | did_motion = 1; |
993b6404 | 1973 | } |
99ce22d5 | 1974 | else |
993b6404 | 1975 | { |
99ce22d5 KH |
1976 | pos.hpos = lmargin + (from == BEG ? start_hpos : 0); |
1977 | pos.vpos = 0; | |
a997a7ca | 1978 | pos.tab_offset = 0; |
2ab90d49 | 1979 | did_motion = 0; |
993b6404 | 1980 | } |
2ab90d49 | 1981 | return compute_motion (from, vpos, pos.hpos, did_motion, |
a997a7ca | 1982 | ZV, vtarget, - (1 << (BITS_PER_SHORT - 1)), |
2dd4e608 | 1983 | width, hscroll, |
a997a7ca | 1984 | pos.tab_offset - (from == BEG ? start_hpos : 0), |
2dd4e608 | 1985 | w); |
993b6404 JB |
1986 | } |
1987 | ||
f1ecfe9b | 1988 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
8c1a1077 PJ |
1989 | doc: /* Move point to start of the screen line LINES lines down. |
1990 | If LINES is negative, this means moving up. | |
1991 | ||
1992 | This function is an ordinary cursor motion function | |
1993 | which calculates the new position based on how text would be displayed. | |
1994 | The new position may be the start of a line, | |
1995 | or just the start of a continuation line. | |
1996 | The function returns number of screen lines moved over; | |
1997 | that usually equals LINES, but may be closer to zero | |
1998 | if beginning or end of buffer was reached. | |
1999 | ||
2000 | The optional second argument WINDOW specifies the window to use for | |
2001 | parameters such as width, horizontal scrolling, and so on. | |
2002 | The default is to use the selected window's parameters. | |
2003 | ||
2004 | `vertical-motion' always uses the current buffer, | |
2005 | regardless of which buffer is displayed in WINDOW. | |
2006 | This is consistent with other cursor motion functions | |
2007 | and makes it possible to use `vertical-motion' in any buffer, | |
2008 | whether or not it is currently displayed in some window. */) | |
2009 | (lines, window) | |
f1ecfe9b | 2010 | Lisp_Object lines, window; |
993b6404 | 2011 | { |
8720a429 GM |
2012 | struct it it; |
2013 | struct text_pos pt; | |
8720a429 | 2014 | struct window *w; |
39210e90 GM |
2015 | Lisp_Object old_buffer; |
2016 | struct gcpro gcpro1; | |
993b6404 | 2017 | |
b7826503 | 2018 | CHECK_NUMBER (lines); |
f1ecfe9b | 2019 | if (! NILP (window)) |
b7826503 | 2020 | CHECK_WINDOW (window); |
f1ecfe9b | 2021 | else |
92992c7e | 2022 | window = selected_window; |
8720a429 | 2023 | w = XWINDOW (window); |
39210e90 GM |
2024 | |
2025 | old_buffer = Qnil; | |
2026 | GCPRO1 (old_buffer); | |
2027 | if (XBUFFER (w->buffer) != current_buffer) | |
8720a429 | 2028 | { |
39210e90 GM |
2029 | /* Set the window's buffer temporarily to the current buffer. */ |
2030 | old_buffer = w->buffer; | |
2031 | XSETBUFFER (w->buffer, current_buffer); | |
8720a429 | 2032 | } |
097812fb | 2033 | |
8720a429 GM |
2034 | SET_TEXT_POS (pt, PT, PT_BYTE); |
2035 | start_display (&it, w, pt); | |
3a46a5de | 2036 | |
e70d5579 RS |
2037 | /* Move to the start of the display line containing PT. If we don't |
2038 | do this, we start moving with IT->current_x == 0, while PT is | |
2039 | really at some x > 0. The effect is, in continuation lines, that | |
2040 | we end up with the iterator placed at where it thinks X is 0, | |
2041 | while the end position is really at some X > 0, the same X that | |
2042 | PT had. */ | |
3a46a5de GM |
2043 | move_it_by_lines (&it, 0, 0); |
2044 | ||
6f442633 | 2045 | if (XINT (lines) != 0) |
3a46a5de | 2046 | move_it_by_lines (&it, XINT (lines), 0); |
097812fb | 2047 | |
8720a429 GM |
2048 | SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it)); |
2049 | ||
39210e90 GM |
2050 | if (BUFFERP (old_buffer)) |
2051 | w->buffer = old_buffer; | |
097812fb | 2052 | |
39210e90 | 2053 | RETURN_UNGCPRO (make_number (it.vpos)); |
993b6404 | 2054 | } |
8720a429 GM |
2055 | |
2056 | ||
993b6404 | 2057 | \f |
88c6e37e | 2058 | /* File's initialization. */ |
0aa01123 | 2059 | |
dfcf069d | 2060 | void |
993b6404 JB |
2061 | syms_of_indent () |
2062 | { | |
2063 | DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode, | |
8c1a1077 PJ |
2064 | doc: /* *Indentation can insert tabs if this is non-nil. |
2065 | Setting this variable automatically makes it local to the current buffer. */); | |
993b6404 JB |
2066 | indent_tabs_mode = 1; |
2067 | ||
2068 | defsubr (&Scurrent_indentation); | |
2069 | defsubr (&Sindent_to); | |
2070 | defsubr (&Scurrent_column); | |
2071 | defsubr (&Smove_to_column); | |
2072 | defsubr (&Svertical_motion); | |
42918ba5 | 2073 | defsubr (&Scompute_motion); |
993b6404 | 2074 | } |
ab5796a9 MB |
2075 | |
2076 | /* arch-tag: 9adfea44-71f7-4988-8ee3-96da15c502cc | |
2077 | (do not change this comment) */ |