Commit | Line | Data |
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993b6404 | 1 | /* Indentation functions. |
3a22ee35 | 2 | Copyright (C) 1985,86,87,88,93,94 Free Software Foundation, Inc. |
993b6404 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
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 | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
18160b98 | 21 | #include <config.h> |
993b6404 JB |
22 | #include "lisp.h" |
23 | #include "buffer.h" | |
24 | #include "indent.h" | |
502b9b64 | 25 | #include "frame.h" |
993b6404 JB |
26 | #include "window.h" |
27 | #include "termchar.h" | |
28 | #include "termopts.h" | |
29 | #include "disptab.h" | |
5a05d3d2 | 30 | #include "intervals.h" |
0aa01123 | 31 | #include "region-cache.h" |
993b6404 JB |
32 | |
33 | /* Indentation can insert tabs if this is non-zero; | |
34 | otherwise always uses spaces */ | |
35 | int indent_tabs_mode; | |
36 | ||
37 | #define min(a, b) ((a) < (b) ? (a) : (b)) | |
38 | #define max(a, b) ((a) > (b) ? (a) : (b)) | |
39 | ||
40 | #define CR 015 | |
41 | ||
42 | /* These three values memoize the current column to avoid recalculation */ | |
43 | /* Some things in set last_known_column_point to -1 | |
44 | to mark the memoized value as invalid */ | |
45 | /* Last value returned by current_column */ | |
46 | int last_known_column; | |
47 | /* Value of point when current_column was called */ | |
48 | int last_known_column_point; | |
49 | /* Value of MODIFF when current_column was called */ | |
50 | int last_known_column_modified; | |
51 | ||
993b6404 JB |
52 | /* Get the display table to use for the current buffer. */ |
53 | ||
54 | struct Lisp_Vector * | |
55 | buffer_display_table () | |
56 | { | |
57 | Lisp_Object thisbuf; | |
58 | ||
59 | thisbuf = current_buffer->display_table; | |
eeaafd4f | 60 | if (VECTORP (thisbuf) && XVECTOR (thisbuf)->size == DISP_TABLE_SIZE) |
993b6404 | 61 | return XVECTOR (thisbuf); |
eeaafd4f | 62 | if (VECTORP (Vstandard_display_table) |
993b6404 JB |
63 | && XVECTOR (Vstandard_display_table)->size == DISP_TABLE_SIZE) |
64 | return XVECTOR (Vstandard_display_table); | |
65 | return 0; | |
66 | } | |
67 | \f | |
0aa01123 JB |
68 | /* Width run cache considerations. */ |
69 | ||
70 | /* Return the width of character C under display table DP. */ | |
71 | static int | |
72 | character_width (c, dp) | |
73 | int c; | |
74 | struct Lisp_Vector *dp; | |
75 | { | |
76 | Lisp_Object elt; | |
77 | ||
78 | /* These width computations were determined by examining the cases | |
79 | in display_text_line. */ | |
80 | ||
81 | /* Some characters are never handled by the display table. */ | |
82 | if (c == '\n' || c == '\t' || c == '\015') | |
83 | return 0; | |
84 | ||
85 | /* Everything else might be handled by the display table, if it's | |
86 | present and the element is right. */ | |
87 | else if (dp && (elt = DISP_CHAR_VECTOR (dp, c), | |
88 | VECTORP (elt))) | |
89 | return XVECTOR (elt)->size; | |
90 | ||
91 | /* In the absence of display table perversities, printing characters | |
92 | have width 1. */ | |
93 | else if (c >= 040 && c < 0177) | |
94 | return 1; | |
95 | ||
96 | /* Everybody else (control characters, metacharacters) has other | |
97 | widths. We could return their actual widths here, but they | |
98 | depend on things like ctl_arrow and crud like that, and they're | |
99 | not very common at all. So we'll just claim we don't know their | |
100 | widths. */ | |
101 | else | |
102 | return 0; | |
103 | } | |
104 | ||
105 | /* Return true iff the display table DISPTAB specifies the same widths | |
106 | for characters as WIDTHTAB. We use this to decide when to | |
107 | invalidate the buffer's width_run_cache. */ | |
108 | int | |
109 | disptab_matches_widthtab (disptab, widthtab) | |
110 | struct Lisp_Vector *disptab; | |
111 | struct Lisp_Vector *widthtab; | |
112 | { | |
113 | int i; | |
114 | ||
115 | if (widthtab->size != 256) | |
116 | abort (); | |
117 | ||
118 | for (i = 0; i < 256; i++) | |
119 | if (character_width (i, disptab) | |
120 | != XFASTINT (widthtab->contents[i])) | |
121 | return 0; | |
122 | ||
123 | return 1; | |
124 | } | |
125 | ||
126 | /* Recompute BUF's width table, using the display table DISPTAB. */ | |
127 | void | |
128 | recompute_width_table (buf, disptab) | |
129 | struct buffer *buf; | |
130 | struct Lisp_Vector *disptab; | |
131 | { | |
132 | int i; | |
228a2e1a | 133 | struct Lisp_Vector *widthtab; |
0aa01123 | 134 | |
228a2e1a KH |
135 | if (!VECTORP (buf->width_table)) |
136 | buf->width_table = Fmake_vector (make_number (256), make_number (0)); | |
137 | widthtab = XVECTOR (buf->width_table); | |
0aa01123 JB |
138 | if (widthtab->size != 256) |
139 | abort (); | |
140 | ||
141 | for (i = 0; i < 256; i++) | |
228a2e1a | 142 | XSETFASTINT (widthtab->contents[i], character_width (i, disptab)); |
0aa01123 JB |
143 | } |
144 | ||
145 | /* Allocate or free the width run cache, as requested by the current | |
146 | state of current_buffer's cache_long_line_scans variable. */ | |
147 | static void | |
148 | width_run_cache_on_off () | |
149 | { | |
150 | if (NILP (current_buffer->cache_long_line_scans)) | |
151 | { | |
152 | /* It should be off. */ | |
153 | if (current_buffer->width_run_cache) | |
154 | { | |
155 | free_region_cache (current_buffer->width_run_cache); | |
156 | current_buffer->width_run_cache = 0; | |
157 | current_buffer->width_table = Qnil; | |
158 | } | |
159 | } | |
160 | else | |
161 | { | |
162 | /* It should be on. */ | |
163 | if (current_buffer->width_run_cache == 0) | |
164 | { | |
165 | current_buffer->width_run_cache = new_region_cache (); | |
0aa01123 JB |
166 | recompute_width_table (current_buffer, buffer_display_table ()); |
167 | } | |
168 | } | |
169 | } | |
170 | ||
171 | \f | |
993b6404 JB |
172 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, |
173 | "Return the horizontal position of point. Beginning of line is column 0.\n\ | |
174 | This is calculated by adding together the widths of all the displayed\n\ | |
175 | representations of the character between the start of the previous line\n\ | |
176 | and point. (eg control characters will have a width of 2 or 4, tabs\n\ | |
177 | will have a variable width)\n\ | |
502b9b64 JB |
178 | Ignores finite width of frame, which means that this function may return\n\ |
179 | values greater than (frame-width).\n\ | |
993b6404 JB |
180 | Whether the line is visible (if `selective-display' is t) has no effect;\n\ |
181 | however, ^M is treated as end of line when `selective-display' is t.") | |
182 | () | |
183 | { | |
184 | Lisp_Object temp; | |
94d92e9c | 185 | XSETFASTINT (temp, current_column ()); |
993b6404 JB |
186 | return temp; |
187 | } | |
188 | ||
e74928fc JB |
189 | /* Cancel any recorded value of the horizontal position. */ |
190 | ||
191 | invalidate_current_column () | |
192 | { | |
193 | last_known_column_point = 0; | |
194 | } | |
195 | ||
993b6404 JB |
196 | int |
197 | current_column () | |
198 | { | |
199 | register int col; | |
200 | register unsigned char *ptr, *stop; | |
201 | register int tab_seen; | |
202 | int post_tab; | |
203 | register int c; | |
204 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 205 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
993b6404 JB |
206 | register struct Lisp_Vector *dp = buffer_display_table (); |
207 | int stopchar; | |
208 | ||
209 | if (point == last_known_column_point | |
210 | && MODIFF == last_known_column_modified) | |
211 | return last_known_column; | |
212 | ||
213 | /* Make a pointer for decrementing through the chars before point. */ | |
214 | ptr = &FETCH_CHAR (point - 1) + 1; | |
215 | /* Make a pointer to where consecutive chars leave off, | |
216 | going backwards from point. */ | |
217 | if (point == BEGV) | |
218 | stop = ptr; | |
219 | else if (point <= GPT || BEGV > GPT) | |
220 | stop = BEGV_ADDR; | |
221 | else | |
222 | stop = GAP_END_ADDR; | |
223 | ||
ccdcf1f5 | 224 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
225 | |
226 | col = 0, tab_seen = 0, post_tab = 0; | |
227 | ||
228 | while (1) | |
229 | { | |
230 | if (ptr == stop) | |
231 | { | |
232 | /* We stopped either for the beginning of the buffer | |
233 | or for the gap. */ | |
234 | if (ptr == BEGV_ADDR) | |
235 | break; | |
236 | /* It was the gap. Jump back over it. */ | |
237 | stop = BEGV_ADDR; | |
238 | ptr = GPT_ADDR; | |
239 | /* Check whether that brings us to beginning of buffer. */ | |
240 | if (BEGV >= GPT) break; | |
241 | } | |
242 | ||
243 | c = *--ptr; | |
244 | if (c >= 040 && c < 0177 | |
eeaafd4f | 245 | && (dp == 0 || !VECTORP (DISP_CHAR_VECTOR (dp, c)))) |
993b6404 JB |
246 | { |
247 | col++; | |
248 | } | |
249 | else if (c == '\n') | |
250 | break; | |
251 | else if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
252 | break; | |
253 | else if (c == '\t') | |
254 | { | |
255 | if (tab_seen) | |
256 | col = ((col + tab_width) / tab_width) * tab_width; | |
257 | ||
258 | post_tab += col; | |
259 | col = 0; | |
260 | tab_seen = 1; | |
261 | } | |
eeaafd4f | 262 | else if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
dea4d2e6 | 263 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; |
993b6404 JB |
264 | else |
265 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
266 | } | |
267 | ||
268 | if (tab_seen) | |
269 | { | |
270 | col = ((col + tab_width) / tab_width) * tab_width; | |
271 | col += post_tab; | |
272 | } | |
273 | ||
274 | last_known_column = col; | |
275 | last_known_column_point = point; | |
276 | last_known_column_modified = MODIFF; | |
277 | ||
278 | return col; | |
279 | } | |
280 | \f | |
993b6404 JB |
281 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
282 | "Indent from point with tabs and spaces until COLUMN is reached.\n\ | |
283 | Optional second argument MIN says always do at least MIN spaces\n\ | |
284 | even if that goes past COLUMN; by default, MIN is zero.") | |
285 | (col, minimum) | |
286 | Lisp_Object col, minimum; | |
287 | { | |
288 | int mincol; | |
289 | register int fromcol; | |
290 | register int tab_width = XINT (current_buffer->tab_width); | |
291 | ||
292 | CHECK_NUMBER (col, 0); | |
56a98455 | 293 | if (NILP (minimum)) |
94d92e9c | 294 | XSETFASTINT (minimum, 0); |
993b6404 JB |
295 | CHECK_NUMBER (minimum, 1); |
296 | ||
297 | fromcol = current_column (); | |
298 | mincol = fromcol + XINT (minimum); | |
299 | if (mincol < XINT (col)) mincol = XINT (col); | |
300 | ||
301 | if (fromcol == mincol) | |
302 | return make_number (mincol); | |
303 | ||
ccdcf1f5 | 304 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
305 | |
306 | if (indent_tabs_mode) | |
307 | { | |
308 | Lisp_Object n; | |
94d92e9c | 309 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
310 | if (XFASTINT (n) != 0) |
311 | { | |
6d1bd1a5 | 312 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
313 | |
314 | fromcol = (mincol / tab_width) * tab_width; | |
315 | } | |
316 | } | |
317 | ||
94d92e9c | 318 | XSETFASTINT (col, mincol - fromcol); |
6d1bd1a5 | 319 | Finsert_char (make_number (' '), col, Qt); |
993b6404 JB |
320 | |
321 | last_known_column = mincol; | |
322 | last_known_column_point = point; | |
323 | last_known_column_modified = MODIFF; | |
324 | ||
325 | XSETINT (col, mincol); | |
326 | return col; | |
327 | } | |
0aa01123 | 328 | |
993b6404 JB |
329 | \f |
330 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, | |
331 | 0, 0, 0, | |
332 | "Return the indentation of the current line.\n\ | |
333 | This is the horizontal position of the character\n\ | |
334 | following any initial whitespace.") | |
335 | () | |
336 | { | |
337 | Lisp_Object val; | |
338 | ||
94d92e9c | 339 | XSETFASTINT (val, position_indentation (find_next_newline (point, -1))); |
993b6404 JB |
340 | return val; |
341 | } | |
342 | ||
343 | position_indentation (pos) | |
344 | register int pos; | |
345 | { | |
346 | register int column = 0; | |
347 | register int tab_width = XINT (current_buffer->tab_width); | |
348 | register unsigned char *p; | |
349 | register unsigned char *stop; | |
350 | ||
ccdcf1f5 | 351 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
352 | |
353 | stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1; | |
354 | p = &FETCH_CHAR (pos); | |
355 | while (1) | |
356 | { | |
357 | while (p == stop) | |
358 | { | |
359 | if (pos == ZV) | |
360 | return column; | |
361 | pos += p - &FETCH_CHAR (pos); | |
362 | p = &FETCH_CHAR (pos); | |
363 | stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1; | |
364 | } | |
365 | switch (*p++) | |
366 | { | |
367 | case ' ': | |
368 | column++; | |
369 | break; | |
370 | case '\t': | |
371 | column += tab_width - column % tab_width; | |
372 | break; | |
373 | default: | |
374 | return column; | |
375 | } | |
376 | } | |
377 | } | |
1b15e576 KH |
378 | |
379 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
380 | Blank lines are treated as if they had the same indentation as the | |
381 | preceding line. */ | |
382 | int | |
383 | indented_beyond_p (pos, column) | |
384 | int pos, column; | |
385 | { | |
386 | while (pos > BEGV && FETCH_CHAR (pos) == '\n') | |
04d25c3d | 387 | pos = find_next_newline_no_quit (pos - 1, -1); |
1b15e576 KH |
388 | return (position_indentation (pos) >= column); |
389 | } | |
0aa01123 | 390 | |
993b6404 JB |
391 | \f |
392 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, 0, | |
393 | "Move point to column COLUMN in the current line.\n\ | |
394 | The column of a character is calculated by adding together the widths\n\ | |
395 | as displayed of the previous characters in the line.\n\ | |
396 | This function ignores line-continuation;\n\ | |
397 | there is no upper limit on the column number a character can have\n\ | |
230a4cbd JB |
398 | and horizontal scrolling has no effect.\n\ |
399 | \n\ | |
993b6404 JB |
400 | If specified column is within a character, point goes after that character.\n\ |
401 | If it's past end of line, point goes to end of line.\n\n\ | |
402 | A non-nil second (optional) argument FORCE means, if the line\n\ | |
403 | is too short to reach column COLUMN then add spaces/tabs to get there,\n\ | |
404 | and if COLUMN is in the middle of a tab character, change it to spaces.") | |
405 | (column, force) | |
406 | Lisp_Object column, force; | |
407 | { | |
408 | register int pos; | |
409 | register int col = current_column (); | |
410 | register int goal; | |
411 | register int end; | |
412 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 413 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
993b6404 JB |
414 | register struct Lisp_Vector *dp = buffer_display_table (); |
415 | ||
416 | Lisp_Object val; | |
417 | int prev_col; | |
418 | int c; | |
419 | ||
ccdcf1f5 | 420 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
421 | CHECK_NATNUM (column, 0); |
422 | goal = XINT (column); | |
423 | ||
424 | retry: | |
425 | pos = point; | |
426 | end = ZV; | |
427 | ||
428 | /* If we're starting past the desired column, | |
429 | back up to beginning of line and scan from there. */ | |
430 | if (col > goal) | |
431 | { | |
432 | pos = find_next_newline (pos, -1); | |
433 | col = 0; | |
434 | } | |
435 | ||
436 | while (col < goal && pos < end) | |
437 | { | |
438 | c = FETCH_CHAR (pos); | |
439 | if (c == '\n') | |
440 | break; | |
441 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
442 | break; | |
443 | pos++; | |
444 | if (c == '\t') | |
445 | { | |
446 | prev_col = col; | |
447 | col += tab_width; | |
448 | col = col / tab_width * tab_width; | |
449 | } | |
eeaafd4f | 450 | else if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
dea4d2e6 | 451 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; |
993b6404 | 452 | else if (ctl_arrow && (c < 040 || c == 0177)) |
bbc2998f | 453 | col += 2; |
993b6404 | 454 | else if (c < 040 || c >= 0177) |
bbc2998f | 455 | col += 4; |
993b6404 JB |
456 | else |
457 | col++; | |
458 | } | |
459 | ||
460 | SET_PT (pos); | |
461 | ||
462 | /* If a tab char made us overshoot, change it to spaces | |
463 | and scan through it again. */ | |
56a98455 | 464 | if (!NILP (force) && col > goal && c == '\t' && prev_col < goal) |
993b6404 | 465 | { |
70ee42f7 JB |
466 | int old_point; |
467 | ||
993b6404 | 468 | del_range (point - 1, point); |
70ee42f7 JB |
469 | Findent_to (make_number (goal), Qnil); |
470 | old_point = point; | |
471 | Findent_to (make_number (col), Qnil); | |
472 | SET_PT (old_point); | |
5a05d3d2 RS |
473 | /* Set the last_known... vars consistently. */ |
474 | col = goal; | |
993b6404 JB |
475 | } |
476 | ||
477 | /* If line ends prematurely, add space to the end. */ | |
56a98455 | 478 | if (col < goal && !NILP (force)) |
230a4cbd | 479 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
480 | |
481 | last_known_column = col; | |
482 | last_known_column_point = point; | |
483 | last_known_column_modified = MODIFF; | |
484 | ||
94d92e9c | 485 | XSETFASTINT (val, col); |
993b6404 JB |
486 | return val; |
487 | } | |
0aa01123 | 488 | |
993b6404 | 489 | \f |
0aa01123 JB |
490 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
491 | ||
993b6404 JB |
492 | struct position val_compute_motion; |
493 | ||
494 | /* Scan the current buffer forward from offset FROM, pretending that | |
495 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
496 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
497 | and return the ending buffer position and screen location. If we |
498 | can't hit the requested column exactly (because of a tab or other | |
499 | multi-column character), overshoot. | |
993b6404 JB |
500 | |
501 | WIDTH is the number of columns available to display text; | |
502 | compute_motion uses this to handle continuation lines and such. | |
503 | HSCROLL is the number of columns not being displayed at the left | |
504 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
505 | TAB_OFFSET is the number of columns of the first tab that aren't |
506 | being displayed, perhaps because of a continuation line or | |
507 | something. | |
993b6404 JB |
508 | |
509 | compute_motion returns a pointer to a struct position. The bufpos | |
510 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
511 | and vpos give its cartesian location. prevhpos is the column at |
512 | which the character before bufpos started, and contin is non-zero | |
513 | if we reached the current line by continuing the previous. | |
514 | ||
515 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
516 | columns, taking HSCROLL and the truncation glyph at the left margin | |
517 | into account. That is, beginning-of-line moves you to the hpos | |
518 | -HSCROLL + (HSCROLL > 0). | |
993b6404 | 519 | |
1827d036 KH |
520 | Note that FROMHPOS and TOHPOS should be expressed in real screen |
521 | columns, taking HSCROLL and the truncation glyph at the left margin | |
522 | into account. That is, beginning-of-line moves you to the hpos | |
523 | -HSCROLL + (HSCROLL > 0). | |
524 | ||
993b6404 JB |
525 | For example, to find the buffer position of column COL of line LINE |
526 | of a certain window, pass the window's starting location as FROM | |
527 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
528 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
529 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
530 | TOHPOS. | |
531 | ||
532 | When displaying in window w, a typical formula for WIDTH is: | |
533 | ||
534 | window_width - 1 | |
a3c87d4e | 535 | - (has_vertical_scroll_bars |
40284d6b | 536 | ? FRAME_SCROLL_BAR_COLS (XFRAME (window->frame)) |
fa61c701 | 537 | : (window_width + window_left != frame_width)) |
993b6404 JB |
538 | |
539 | where | |
540 | window_width is XFASTINT (w->width), | |
541 | window_left is XFASTINT (w->left), | |
a3c87d4e JB |
542 | has_vertical_scroll_bars is |
543 | FRAME_HAS_VERTICAL_SCROLL_BARS (XFRAME (WINDOW_FRAME (window))) | |
fa61c701 | 544 | and frame_width = FRAME_WIDTH (XFRAME (window->frame)) |
993b6404 | 545 | |
1827d036 KH |
546 | Or you can let window_internal_width do this all for you, and write: |
547 | window_internal_width (w) - 1 | |
fa61c701 JB |
548 | |
549 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 550 | accounts for window borders if the window is split horizontally, and |
1827d036 | 551 | the scroll bars if they are turned on. */ |
993b6404 JB |
552 | |
553 | struct position * | |
88af3af4 | 554 | compute_motion (from, fromvpos, fromhpos, to, tovpos, tohpos, width, hscroll, tab_offset, win) |
993b6404 JB |
555 | int from, fromvpos, fromhpos, to, tovpos, tohpos; |
556 | register int width; | |
557 | int hscroll, tab_offset; | |
88af3af4 | 558 | struct window *win; |
993b6404 | 559 | { |
cde9337b JB |
560 | register int hpos = fromhpos; |
561 | register int vpos = fromvpos; | |
562 | ||
993b6404 JB |
563 | register int pos; |
564 | register int c; | |
565 | register int tab_width = XFASTINT (current_buffer->tab_width); | |
56a98455 | 566 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
88af3af4 | 567 | register struct Lisp_Vector *dp = window_display_table (win); |
993b6404 | 568 | int selective |
eeaafd4f | 569 | = (INTEGERP (current_buffer->selective_display) |
69eaf10d RS |
570 | ? XINT (current_buffer->selective_display) |
571 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
0aa01123 | 572 | int prev_vpos = vpos, prev_hpos = 0; |
993b6404 | 573 | int selective_rlen |
eeaafd4f | 574 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
dea4d2e6 | 575 | ? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0); |
5a05d3d2 RS |
576 | #ifdef USE_TEXT_PROPERTIES |
577 | /* The next location where the `invisible' property changes */ | |
578 | int next_invisible = from; | |
579 | Lisp_Object prop, position; | |
580 | #endif | |
993b6404 | 581 | |
0aa01123 JB |
582 | /* For computing runs of characters with similar widths. |
583 | Invariant: width_run_width is zero, or all the characters | |
584 | from width_run_start to width_run_end have a fixed width of | |
585 | width_run_width. */ | |
586 | int width_run_start = from; | |
587 | int width_run_end = from; | |
588 | int width_run_width = 0; | |
589 | Lisp_Object *width_table; | |
590 | ||
591 | /* The next buffer pos where we should consult the width run cache. */ | |
592 | int next_width_run = from; | |
593 | ||
594 | width_run_cache_on_off (); | |
595 | if (dp == buffer_display_table ()) | |
596 | width_table = (VECTORP (current_buffer->width_table) | |
597 | ? XVECTOR (current_buffer->width_table)->contents | |
598 | : 0); | |
599 | else | |
600 | /* If the window has its own display table, we can't use the width | |
601 | run cache, because that's based on the buffer's display table. */ | |
602 | width_table = 0; | |
603 | ||
ccdcf1f5 | 604 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
0aa01123 | 605 | for (pos = from; pos < to; ) |
993b6404 | 606 | { |
cde9337b JB |
607 | /* Stop if past the target screen position. */ |
608 | if (vpos > tovpos | |
609 | || (vpos == tovpos && hpos >= tohpos)) | |
610 | break; | |
611 | ||
612 | prev_vpos = vpos; | |
613 | prev_hpos = hpos; | |
614 | ||
5a05d3d2 RS |
615 | #ifdef USE_TEXT_PROPERTIES |
616 | /* if the `invisible' property is set, we can skip to | |
617 | the next property change */ | |
618 | while (pos == next_invisible && pos < to) | |
f75c0f8a | 619 | { |
94d92e9c | 620 | XSETFASTINT (position, pos); |
67406ef4 | 621 | prop = Fget_char_property (position, |
f75c0f8a RS |
622 | Qinvisible, |
623 | Fcurrent_buffer ()); | |
624 | { | |
625 | Lisp_Object end, limit; | |
626 | ||
90ed3777 | 627 | recenter_overlay_lists (current_buffer, pos); |
f75c0f8a RS |
628 | /* This is just an estimate to give reasonable |
629 | performance; nothing should go wrong if it is too small. */ | |
7ea9c020 KH |
630 | limit = Fnext_overlay_change (position); |
631 | if (XFASTINT (limit) > pos + 100) | |
94d92e9c | 632 | XSETFASTINT (limit, pos + 100); |
f75c0f8a RS |
633 | end = Fnext_single_property_change (position, Qinvisible, |
634 | Fcurrent_buffer (), limit); | |
635 | if (INTEGERP (end)) | |
636 | next_invisible = XINT (end); | |
637 | else | |
638 | next_invisible = to; | |
639 | if (! NILP (prop)) | |
640 | pos = next_invisible; | |
641 | } | |
642 | } | |
5a05d3d2 RS |
643 | if (pos >= to) |
644 | break; | |
645 | #endif | |
0aa01123 JB |
646 | |
647 | /* Consult the width run cache to see if we can avoid inspecting | |
648 | the text character-by-character. */ | |
649 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
650 | { | |
651 | int run_end; | |
652 | int common_width | |
653 | = region_cache_forward (current_buffer, | |
654 | current_buffer->width_run_cache, | |
655 | pos, &run_end); | |
656 | ||
657 | /* A width of zero means the character's width varies (like | |
658 | a tab), is meaningless (like a newline), or we just don't | |
659 | want to skip over it for some other reason. */ | |
660 | if (common_width != 0) | |
661 | { | |
662 | int run_end_hpos; | |
663 | ||
664 | /* Don't go past the final buffer posn the user | |
665 | requested. */ | |
666 | if (run_end > to) | |
667 | run_end = to; | |
668 | ||
669 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
670 | ||
671 | /* Don't go past the final horizontal position the user | |
672 | requested. */ | |
673 | if (vpos == tovpos && run_end_hpos > tohpos) | |
674 | { | |
675 | run_end = pos + (tohpos - hpos) / common_width; | |
676 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
677 | } | |
678 | ||
679 | /* Don't go past the margin. */ | |
680 | if (run_end_hpos >= width) | |
681 | { | |
682 | run_end = pos + (width - hpos) / common_width; | |
683 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
684 | } | |
685 | ||
686 | hpos = run_end_hpos; | |
687 | if (run_end > pos) | |
688 | prev_hpos = hpos - common_width; | |
689 | pos = run_end; | |
690 | } | |
691 | ||
692 | next_width_run = run_end + 1; | |
693 | } | |
694 | ||
695 | /* We have to scan the text character-by-character. */ | |
993b6404 | 696 | else |
0aa01123 JB |
697 | { |
698 | c = FETCH_CHAR (pos); | |
699 | pos++; | |
700 | ||
701 | /* Perhaps add some info to the width_run_cache. */ | |
702 | if (current_buffer->width_run_cache) | |
703 | { | |
704 | /* Is this character part of the current run? If so, extend | |
705 | the run. */ | |
706 | if (pos - 1 == width_run_end | |
707 | && width_table[c] == width_run_width) | |
708 | width_run_end = pos; | |
709 | ||
710 | /* The previous run is over, since this is a character at a | |
711 | different position, or a different width. */ | |
712 | else | |
713 | { | |
714 | /* Have we accumulated a run to put in the cache? | |
715 | (Currently, we only cache runs of width == 1. */ | |
716 | if (width_run_start < width_run_end | |
717 | && width_run_width == 1) | |
718 | know_region_cache (current_buffer, | |
719 | current_buffer->width_run_cache, | |
720 | width_run_start, width_run_end); | |
721 | ||
722 | /* Start recording a new width run. */ | |
723 | width_run_width = width_table[c]; | |
724 | width_run_start = pos - 1; | |
725 | width_run_end = pos; | |
726 | } | |
727 | } | |
728 | ||
729 | if (c >= 040 && c < 0177 | |
730 | && (dp == 0 || ! VECTORP (DISP_CHAR_VECTOR (dp, c)))) | |
731 | hpos++; | |
732 | else if (c == '\t') | |
733 | { | |
734 | hpos += tab_width - ((hpos + tab_offset + hscroll - (hscroll > 0) | |
735 | /* Add tab_width here to make sure | |
736 | positive. hpos can be negative | |
737 | after continuation but can't be | |
738 | less than -tab_width. */ | |
739 | + tab_width) | |
740 | % tab_width); | |
741 | } | |
742 | else if (c == '\n') | |
743 | { | |
744 | if (selective > 0 && indented_beyond_p (pos, selective)) | |
745 | { | |
746 | /* Skip any number of invisible lines all at once */ | |
747 | do | |
748 | pos = find_before_next_newline (pos, to, 1); | |
749 | while (pos < to | |
750 | && indented_beyond_p (pos, selective)); | |
751 | /* Allow for the " ..." that is displayed for them. */ | |
752 | if (selective_rlen) | |
753 | { | |
754 | hpos += selective_rlen; | |
755 | if (hpos >= width) | |
756 | hpos = width; | |
757 | } | |
758 | /* We have skipped the invis text, but not the | |
759 | newline after. */ | |
760 | } | |
761 | else | |
762 | { | |
763 | /* A visible line. */ | |
764 | vpos++; | |
765 | hpos = 0; | |
766 | hpos -= hscroll; | |
767 | /* Count the truncation glyph on column 0 */ | |
768 | if (hscroll > 0) | |
769 | hpos++; | |
770 | tab_offset = 0; | |
771 | } | |
772 | } | |
773 | else if (c == CR && selective < 0) | |
774 | { | |
775 | /* In selective display mode, | |
776 | everything from a ^M to the end of the line is invisible. | |
777 | Stop *before* the real newline. */ | |
778 | pos = find_before_next_newline (pos, to, 1); | |
779 | /* Allow for the " ..." that is displayed for them. */ | |
780 | if (selective_rlen) | |
781 | { | |
782 | hpos += selective_rlen; | |
783 | if (hpos >= width) | |
784 | hpos = width; | |
785 | } | |
786 | } | |
787 | else if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
788 | hpos += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
789 | else | |
790 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
791 | } | |
993b6404 | 792 | |
cde9337b JB |
793 | /* Handle right margin. */ |
794 | if (hpos >= width | |
795 | && (hpos > width | |
0aa01123 JB |
796 | || (pos < ZV |
797 | && FETCH_CHAR (pos) != '\n'))) | |
993b6404 | 798 | { |
cde9337b JB |
799 | if (vpos > tovpos |
800 | || (vpos == tovpos && hpos >= tohpos)) | |
993b6404 JB |
801 | break; |
802 | if (hscroll | |
803 | || (truncate_partial_width_windows | |
5d83b593 | 804 | && width + 1 < FRAME_WIDTH (XFRAME (WINDOW_FRAME (win)))) |
56a98455 | 805 | || !NILP (current_buffer->truncate_lines)) |
993b6404 | 806 | { |
cde9337b | 807 | /* Truncating: skip to newline. */ |
0aa01123 | 808 | pos = find_before_next_newline (pos, to, 1); |
e51eab7c | 809 | hpos = width; |
993b6404 JB |
810 | } |
811 | else | |
812 | { | |
cde9337b JB |
813 | /* Continuing. */ |
814 | vpos++; | |
815 | hpos -= width; | |
993b6404 JB |
816 | tab_offset += width; |
817 | } | |
818 | ||
819 | } | |
820 | } | |
821 | ||
0aa01123 JB |
822 | /* Remember any final width run in the cache. */ |
823 | if (current_buffer->width_run_cache | |
824 | && width_run_width == 1 | |
825 | && width_run_start < width_run_end) | |
826 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
827 | width_run_start, width_run_end); | |
828 | ||
993b6404 | 829 | val_compute_motion.bufpos = pos; |
cde9337b JB |
830 | val_compute_motion.hpos = hpos; |
831 | val_compute_motion.vpos = vpos; | |
832 | val_compute_motion.prevhpos = prev_hpos; | |
993b6404 JB |
833 | |
834 | /* Nonzero if have just continued a line */ | |
835 | val_compute_motion.contin | |
cde9337b JB |
836 | = (pos != from |
837 | && (val_compute_motion.vpos != prev_vpos) | |
838 | && c != '\n'); | |
993b6404 JB |
839 | |
840 | return &val_compute_motion; | |
841 | } | |
993b6404 | 842 | |
992371ca KH |
843 | #if 0 /* The doc string is too long for some compilers, |
844 | but make-docfile can find it in this comment. */ | |
88af3af4 | 845 | DEFUN ("compute-motion", Ffoo, Sfoo, 7, 7, 0, |
42918ba5 RS |
846 | "Scan through the current buffer, calculating screen position.\n\ |
847 | Scan the current buffer forward from offset FROM,\n\ | |
848 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)--\n\ | |
849 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)--\n\ | |
850 | and return the ending buffer position and screen location.\n\ | |
851 | \n\ | |
88af3af4 | 852 | There are three additional arguments:\n\ |
42918ba5 RS |
853 | \n\ |
854 | WIDTH is the number of columns available to display text;\n\ | |
855 | this affects handling of continuation lines.\n\ | |
992371ca KH |
856 | This is usually the value returned by `window-width', less one (to allow\n\ |
857 | for the continuation glyph).\n\ | |
42918ba5 RS |
858 | \n\ |
859 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET).\n\ | |
860 | HSCROLL is the number of columns not being displayed at the left\n\ | |
861 | margin; this is usually taken from a window's hscroll member.\n\ | |
862 | TAB-OFFSET is the number of columns of the first tab that aren't\n\ | |
863 | being displayed, perhaps because the line was continued within it.\n\ | |
4fb76787 | 864 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero.\n\ |
69eaf10d | 865 | \n\ |
88af3af4 | 866 | WINDOW is the window to operate on. Currently this is used only to\n\ |
69eaf10d RS |
867 | find the display table. It does not matter what buffer WINDOW displays;\n\ |
868 | `compute-motion' always operates on the current buffer.\n\ | |
42918ba5 RS |
869 | \n\ |
870 | The value is a list of five elements:\n\ | |
faa5c515 | 871 | (POS HPOS VPOS PREVHPOS CONTIN)\n\ |
42918ba5 RS |
872 | POS is the buffer position where the scan stopped.\n\ |
873 | VPOS is the vertical position where the scan stopped.\n\ | |
874 | HPOS is the horizontal position where the scan stopped.\n\ | |
875 | \n\ | |
876 | PREVHPOS is the horizontal position one character back from POS.\n\ | |
877 | CONTIN is t if a line was continued after (or within) the previous character.\n\ | |
878 | \n\ | |
879 | For example, to find the buffer position of column COL of line LINE\n\ | |
880 | of a certain window, pass the window's starting location as FROM\n\ | |
881 | and the window's upper-left coordinates as FROMPOS.\n\ | |
882 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the\n\ | |
883 | visible section of the buffer, and pass LINE and COL as TOPOS.") | |
5844e1c4 | 884 | (from, frompos, to, topos, width, offsets, window) |
992371ca KH |
885 | #endif |
886 | ||
88af3af4 | 887 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
992371ca | 888 | 0) |
88af3af4 | 889 | (from, frompos, to, topos, width, offsets, window) |
42918ba5 | 890 | Lisp_Object from, frompos, to, topos; |
88af3af4 | 891 | Lisp_Object width, offsets, window; |
42918ba5 RS |
892 | { |
893 | Lisp_Object bufpos, hpos, vpos, prevhpos, contin; | |
894 | struct position *pos; | |
895 | int hscroll, tab_offset; | |
896 | ||
26a8d14b | 897 | CHECK_NUMBER_COERCE_MARKER (from, 0); |
42918ba5 | 898 | CHECK_CONS (frompos, 0); |
26a8d14b KH |
899 | CHECK_NUMBER (XCONS (frompos)->car, 0); |
900 | CHECK_NUMBER (XCONS (frompos)->cdr, 0); | |
901 | CHECK_NUMBER_COERCE_MARKER (to, 0); | |
42918ba5 | 902 | CHECK_CONS (topos, 0); |
26a8d14b KH |
903 | CHECK_NUMBER (XCONS (topos)->car, 0); |
904 | CHECK_NUMBER (XCONS (topos)->cdr, 0); | |
905 | CHECK_NUMBER (width, 0); | |
42918ba5 RS |
906 | if (!NILP (offsets)) |
907 | { | |
908 | CHECK_CONS (offsets, 0); | |
26a8d14b KH |
909 | CHECK_NUMBER (XCONS (offsets)->car, 0); |
910 | CHECK_NUMBER (XCONS (offsets)->cdr, 0); | |
42918ba5 RS |
911 | hscroll = XINT (XCONS (offsets)->car); |
912 | tab_offset = XINT (XCONS (offsets)->cdr); | |
913 | } | |
914 | else | |
915 | hscroll = tab_offset = 0; | |
916 | ||
88af3af4 KH |
917 | if (NILP (window)) |
918 | window = Fselected_window (); | |
919 | else | |
920 | CHECK_LIVE_WINDOW (window, 0); | |
921 | ||
42918ba5 RS |
922 | pos = compute_motion (XINT (from), XINT (XCONS (frompos)->cdr), |
923 | XINT (XCONS (frompos)->car), | |
924 | XINT (to), XINT (XCONS (topos)->cdr), | |
925 | XINT (XCONS (topos)->car), | |
88af3af4 KH |
926 | XINT (width), hscroll, tab_offset, |
927 | XWINDOW (window)); | |
42918ba5 | 928 | |
94d92e9c | 929 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
930 | XSETINT (hpos, pos->hpos); |
931 | XSETINT (vpos, pos->vpos); | |
932 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
933 | |
934 | return Fcons (bufpos, | |
935 | Fcons (hpos, | |
936 | Fcons (vpos, | |
937 | Fcons (prevhpos, | |
938 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
939 | ||
940 | } | |
993b6404 | 941 | \f |
0aa01123 JB |
942 | /* Return the column of position POS in window W's buffer. |
943 | The result is rounded down to a multiple of the internal width of W. | |
993b6404 JB |
944 | This is the amount of indentation of position POS |
945 | that is not visible in its horizontal position in the window. */ | |
946 | ||
947 | int | |
948 | pos_tab_offset (w, pos) | |
949 | struct window *w; | |
950 | register int pos; | |
951 | { | |
3d94e943 | 952 | int opoint = PT; |
993b6404 | 953 | int col; |
fa61c701 | 954 | int width = window_internal_width (w) - 1; |
993b6404 JB |
955 | |
956 | if (pos == BEGV || FETCH_CHAR (pos - 1) == '\n') | |
957 | return 0; | |
3d94e943 | 958 | TEMP_SET_PT (pos); |
993b6404 | 959 | col = current_column (); |
3d94e943 | 960 | TEMP_SET_PT (opoint); |
993b6404 JB |
961 | return col - (col % width); |
962 | } | |
963 | ||
0aa01123 JB |
964 | \f |
965 | /* Fvertical_motion and vmotion */ | |
993b6404 JB |
966 | struct position val_vmotion; |
967 | ||
968 | struct position * | |
969 | vmotion (from, vtarget, width, hscroll, window) | |
970 | register int from, vtarget, width; | |
971 | int hscroll; | |
972 | Lisp_Object window; | |
973 | { | |
974 | struct position pos; | |
975 | /* vpos is cumulative vertical position, changed as from is changed */ | |
976 | register int vpos = 0; | |
92992c7e | 977 | Lisp_Object prevline; |
993b6404 JB |
978 | register int first; |
979 | int lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
980 | int selective | |
eeaafd4f KH |
981 | = (INTEGERP (current_buffer->selective_display) |
982 | ? XINT (current_buffer->selective_display) | |
983 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
cb1068e5 KH |
984 | /* The omission of the clause |
985 | && marker_position (XWINDOW (window)->start) == BEG | |
986 | here is deliberate; I think we want to measure from the prompt | |
987 | position even if the minibuffer window has scrolled. */ | |
988 | int start_hpos = (EQ (window, minibuf_window) ? minibuf_prompt_width : 0); | |
993b6404 JB |
989 | |
990 | retry: | |
991 | if (vtarget > vpos) | |
992 | { | |
993 | /* Moving downward is simple, but must calculate from beg of line | |
994 | to determine hpos of starting point */ | |
995 | if (from > BEGV && FETCH_CHAR (from - 1) != '\n') | |
996 | { | |
94d92e9c | 997 | XSETFASTINT (prevline, find_next_newline_no_quit (from, -1)); |
92992c7e | 998 | while (XFASTINT (prevline) > BEGV |
5a05d3d2 | 999 | && ((selective > 0 |
92992c7e | 1000 | && indented_beyond_p (XFASTINT (prevline), selective)) |
5a05d3d2 RS |
1001 | #ifdef USE_TEXT_PROPERTIES |
1002 | /* watch out for newlines with `invisible' property */ | |
92992c7e | 1003 | || ! NILP (Fget_char_property (prevline, |
5a05d3d2 | 1004 | Qinvisible, |
67406ef4 | 1005 | window)) |
5a05d3d2 RS |
1006 | #endif |
1007 | )) | |
94d92e9c KH |
1008 | XSETFASTINT (prevline, |
1009 | find_next_newline_no_quit (XFASTINT (prevline) - 1, | |
1010 | -1)); | |
92992c7e KH |
1011 | pos = *compute_motion (XFASTINT (prevline), 0, |
1012 | lmargin + (XFASTINT (prevline) == 1 | |
1013 | ? start_hpos : 0), | |
cde9337b | 1014 | from, 1 << (INTBITS - 2), 0, |
88af3af4 | 1015 | width, hscroll, 0, XWINDOW (window)); |
993b6404 JB |
1016 | } |
1017 | else | |
1018 | { | |
1019 | pos.hpos = lmargin + (from == 1 ? start_hpos : 0); | |
1020 | pos.vpos = 0; | |
1021 | } | |
1022 | return compute_motion (from, vpos, pos.hpos, | |
cde9337b | 1023 | ZV, vtarget, - (1 << (INTBITS - 2)), |
88af3af4 KH |
1024 | width, hscroll, pos.vpos * width, |
1025 | XWINDOW (window)); | |
993b6404 JB |
1026 | } |
1027 | ||
1028 | /* To move upward, go a line at a time until | |
1029 | we have gone at least far enough */ | |
1030 | ||
1031 | first = 1; | |
1032 | ||
1033 | while ((vpos > vtarget || first) && from > BEGV) | |
1034 | { | |
94d92e9c | 1035 | XSETFASTINT (prevline, from); |
993b6404 JB |
1036 | while (1) |
1037 | { | |
94d92e9c KH |
1038 | XSETFASTINT (prevline, |
1039 | find_next_newline_no_quit (XFASTINT (prevline) - 1, | |
1040 | -1)); | |
92992c7e | 1041 | if (XFASTINT (prevline) == BEGV |
5a05d3d2 | 1042 | || ((selective <= 0 |
92992c7e | 1043 | || ! indented_beyond_p (XFASTINT (prevline), selective)) |
5a05d3d2 RS |
1044 | #ifdef USE_TEXT_PROPERTIES |
1045 | /* watch out for newlines with `invisible' property */ | |
92992c7e | 1046 | && NILP (Fget_char_property (prevline, Qinvisible, window)) |
5a05d3d2 RS |
1047 | #endif |
1048 | )) | |
993b6404 JB |
1049 | break; |
1050 | } | |
92992c7e KH |
1051 | pos = *compute_motion (XFASTINT (prevline), 0, |
1052 | lmargin + (XFASTINT (prevline) == 1 | |
1053 | ? start_hpos : 0), | |
cde9337b | 1054 | from, 1 << (INTBITS - 2), 0, |
88af3af4 | 1055 | width, hscroll, 0, XWINDOW (window)); |
993b6404 JB |
1056 | vpos -= pos.vpos; |
1057 | first = 0; | |
92992c7e | 1058 | from = XFASTINT (prevline); |
993b6404 JB |
1059 | } |
1060 | ||
1061 | /* If we made exactly the desired vertical distance, | |
1062 | or if we hit beginning of buffer, | |
1063 | return point found */ | |
1064 | if (vpos >= vtarget) | |
1065 | { | |
1066 | val_vmotion.bufpos = from; | |
1067 | val_vmotion.vpos = vpos; | |
1068 | val_vmotion.hpos = lmargin; | |
1069 | val_vmotion.contin = 0; | |
1070 | val_vmotion.prevhpos = 0; | |
1071 | return &val_vmotion; | |
1072 | } | |
1073 | ||
1074 | /* Otherwise find the correct spot by moving down */ | |
1075 | goto retry; | |
1076 | } | |
1077 | ||
f1ecfe9b | 1078 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
993b6404 JB |
1079 | "Move to start of screen line LINES lines down.\n\ |
1080 | If LINES is negative, this is moving up.\n\ | |
69eaf10d RS |
1081 | \n\ |
1082 | The optional second argument WINDOW specifies the window to use for\n\ | |
1083 | parameters such as width, horizontal scrolling, and so on.\n\ | |
1084 | the default is the selected window.\n\ | |
1085 | It does not matter what buffer is displayed in WINDOW.\n\ | |
1086 | `vertical-motion' always uses the current buffer.\n\ | |
1087 | \n\ | |
993b6404 | 1088 | Sets point to position found; this may be start of line\n\ |
69eaf10d | 1089 | or just the start of a continuation line.\n\ |
993b6404 | 1090 | Returns number of lines moved; may be closer to zero than LINES\n\ |
69eaf10d | 1091 | if beginning or end of buffer was reached.") |
f1ecfe9b RS |
1092 | (lines, window) |
1093 | Lisp_Object lines, window; | |
993b6404 JB |
1094 | { |
1095 | struct position pos; | |
230a75fc | 1096 | register struct window *w; |
993b6404 JB |
1097 | |
1098 | CHECK_NUMBER (lines, 0); | |
f1ecfe9b RS |
1099 | if (! NILP (window)) |
1100 | CHECK_WINDOW (window, 0); | |
1101 | else | |
92992c7e | 1102 | window = selected_window; |
993b6404 | 1103 | |
230a75fc | 1104 | w = XWINDOW (window); |
69eaf10d | 1105 | |
230a75fc | 1106 | pos = *vmotion (point, XINT (lines), window_internal_width (w) - 1, |
993b6404 | 1107 | /* Not XFASTINT since perhaps could be negative */ |
f1ecfe9b | 1108 | XINT (w->hscroll), window); |
993b6404 JB |
1109 | |
1110 | SET_PT (pos.bufpos); | |
1111 | return make_number (pos.vpos); | |
1112 | } | |
1113 | \f | |
0aa01123 JB |
1114 | /* file's initialization. */ |
1115 | ||
993b6404 JB |
1116 | syms_of_indent () |
1117 | { | |
1118 | DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode, | |
1119 | "*Indentation can insert tabs if this is non-nil.\n\ | |
1120 | Setting this variable automatically makes it local to the current buffer."); | |
1121 | indent_tabs_mode = 1; | |
1122 | ||
1123 | defsubr (&Scurrent_indentation); | |
1124 | defsubr (&Sindent_to); | |
1125 | defsubr (&Scurrent_column); | |
1126 | defsubr (&Smove_to_column); | |
1127 | defsubr (&Svertical_motion); | |
42918ba5 | 1128 | defsubr (&Scompute_motion); |
993b6404 | 1129 | } |