Commit | Line | Data |
---|---|---|
993b6404 | 1 | /* Indentation functions. |
2ff4775b | 2 | Copyright (C) 1985,86,87,88,93,94,95 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 | |
7c938215 | 8 | the Free Software Foundation; either version 2, or (at your option) |
993b6404 JB |
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. */ | |
f845b8b2 | 71 | |
0aa01123 JB |
72 | static int |
73 | character_width (c, dp) | |
74 | int c; | |
75 | struct Lisp_Vector *dp; | |
76 | { | |
77 | Lisp_Object elt; | |
78 | ||
79 | /* These width computations were determined by examining the cases | |
80 | in display_text_line. */ | |
81 | ||
f845b8b2 | 82 | /* Everything can be handled by the display table, if it's |
0aa01123 | 83 | present and the element is right. */ |
f845b8b2 | 84 | if (dp && (elt = DISP_CHAR_VECTOR (dp, c), VECTORP (elt))) |
0aa01123 JB |
85 | return XVECTOR (elt)->size; |
86 | ||
f845b8b2 RS |
87 | /* Some characters are special. */ |
88 | if (c == '\n' || c == '\t' || c == '\015') | |
89 | return 0; | |
90 | ||
91 | /* Printing characters have width 1. */ | |
0aa01123 JB |
92 | else if (c >= 040 && c < 0177) |
93 | return 1; | |
94 | ||
95 | /* Everybody else (control characters, metacharacters) has other | |
96 | widths. We could return their actual widths here, but they | |
97 | depend on things like ctl_arrow and crud like that, and they're | |
98 | not very common at all. So we'll just claim we don't know their | |
99 | widths. */ | |
100 | else | |
101 | return 0; | |
102 | } | |
103 | ||
104 | /* Return true iff the display table DISPTAB specifies the same widths | |
105 | for characters as WIDTHTAB. We use this to decide when to | |
106 | invalidate the buffer's width_run_cache. */ | |
107 | int | |
108 | disptab_matches_widthtab (disptab, widthtab) | |
109 | struct Lisp_Vector *disptab; | |
110 | struct Lisp_Vector *widthtab; | |
111 | { | |
112 | int i; | |
113 | ||
114 | if (widthtab->size != 256) | |
115 | abort (); | |
116 | ||
117 | for (i = 0; i < 256; i++) | |
118 | if (character_width (i, disptab) | |
119 | != XFASTINT (widthtab->contents[i])) | |
120 | return 0; | |
121 | ||
122 | return 1; | |
2ff4775b | 123 | } |
0aa01123 JB |
124 | |
125 | /* Recompute BUF's width table, using the display table DISPTAB. */ | |
126 | void | |
127 | recompute_width_table (buf, disptab) | |
128 | struct buffer *buf; | |
129 | struct Lisp_Vector *disptab; | |
130 | { | |
131 | int i; | |
228a2e1a | 132 | struct Lisp_Vector *widthtab; |
0aa01123 | 133 | |
228a2e1a KH |
134 | if (!VECTORP (buf->width_table)) |
135 | buf->width_table = Fmake_vector (make_number (256), make_number (0)); | |
136 | widthtab = XVECTOR (buf->width_table); | |
0aa01123 JB |
137 | if (widthtab->size != 256) |
138 | abort (); | |
139 | ||
140 | for (i = 0; i < 256; i++) | |
228a2e1a | 141 | XSETFASTINT (widthtab->contents[i], character_width (i, disptab)); |
0aa01123 JB |
142 | } |
143 | ||
144 | /* Allocate or free the width run cache, as requested by the current | |
145 | state of current_buffer's cache_long_line_scans variable. */ | |
146 | static void | |
147 | width_run_cache_on_off () | |
148 | { | |
149 | if (NILP (current_buffer->cache_long_line_scans)) | |
150 | { | |
151 | /* It should be off. */ | |
152 | if (current_buffer->width_run_cache) | |
153 | { | |
154 | free_region_cache (current_buffer->width_run_cache); | |
155 | current_buffer->width_run_cache = 0; | |
156 | current_buffer->width_table = Qnil; | |
157 | } | |
158 | } | |
159 | else | |
160 | { | |
161 | /* It should be on. */ | |
162 | if (current_buffer->width_run_cache == 0) | |
2ff4775b | 163 | { |
0aa01123 | 164 | current_buffer->width_run_cache = new_region_cache (); |
0aa01123 JB |
165 | recompute_width_table (current_buffer, buffer_display_table ()); |
166 | } | |
167 | } | |
168 | } | |
169 | ||
170 | \f | |
993b6404 JB |
171 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, |
172 | "Return the horizontal position of point. Beginning of line is column 0.\n\ | |
173 | This is calculated by adding together the widths of all the displayed\n\ | |
174 | representations of the character between the start of the previous line\n\ | |
175 | and point. (eg control characters will have a width of 2 or 4, tabs\n\ | |
176 | will have a variable width)\n\ | |
502b9b64 JB |
177 | Ignores finite width of frame, which means that this function may return\n\ |
178 | values greater than (frame-width).\n\ | |
993b6404 JB |
179 | Whether the line is visible (if `selective-display' is t) has no effect;\n\ |
180 | however, ^M is treated as end of line when `selective-display' is t.") | |
181 | () | |
182 | { | |
183 | Lisp_Object temp; | |
94d92e9c | 184 | XSETFASTINT (temp, current_column ()); |
993b6404 JB |
185 | return temp; |
186 | } | |
187 | ||
e74928fc JB |
188 | /* Cancel any recorded value of the horizontal position. */ |
189 | ||
190 | invalidate_current_column () | |
191 | { | |
192 | last_known_column_point = 0; | |
193 | } | |
194 | ||
993b6404 JB |
195 | int |
196 | current_column () | |
197 | { | |
198 | register int col; | |
199 | register unsigned char *ptr, *stop; | |
200 | register int tab_seen; | |
201 | int post_tab; | |
202 | register int c; | |
203 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 204 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
993b6404 JB |
205 | register struct Lisp_Vector *dp = buffer_display_table (); |
206 | int stopchar; | |
207 | ||
208 | if (point == last_known_column_point | |
209 | && MODIFF == last_known_column_modified) | |
210 | return last_known_column; | |
211 | ||
212 | /* Make a pointer for decrementing through the chars before point. */ | |
213 | ptr = &FETCH_CHAR (point - 1) + 1; | |
214 | /* Make a pointer to where consecutive chars leave off, | |
215 | going backwards from point. */ | |
216 | if (point == BEGV) | |
217 | stop = ptr; | |
218 | else if (point <= GPT || BEGV > GPT) | |
219 | stop = BEGV_ADDR; | |
220 | else | |
221 | stop = GAP_END_ADDR; | |
222 | ||
ccdcf1f5 | 223 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
224 | |
225 | col = 0, tab_seen = 0, post_tab = 0; | |
226 | ||
227 | while (1) | |
228 | { | |
229 | if (ptr == stop) | |
230 | { | |
231 | /* We stopped either for the beginning of the buffer | |
232 | or for the gap. */ | |
233 | if (ptr == BEGV_ADDR) | |
234 | break; | |
235 | /* It was the gap. Jump back over it. */ | |
236 | stop = BEGV_ADDR; | |
237 | ptr = GPT_ADDR; | |
238 | /* Check whether that brings us to beginning of buffer. */ | |
239 | if (BEGV >= GPT) break; | |
240 | } | |
241 | ||
242 | c = *--ptr; | |
f845b8b2 RS |
243 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
244 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
245 | else if (c >= 040 && c < 0177) | |
246 | col++; | |
993b6404 JB |
247 | else if (c == '\n') |
248 | break; | |
249 | else if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
250 | break; | |
251 | else if (c == '\t') | |
252 | { | |
253 | if (tab_seen) | |
254 | col = ((col + tab_width) / tab_width) * tab_width; | |
255 | ||
256 | post_tab += col; | |
257 | col = 0; | |
258 | tab_seen = 1; | |
259 | } | |
993b6404 JB |
260 | else |
261 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
262 | } | |
263 | ||
264 | if (tab_seen) | |
265 | { | |
266 | col = ((col + tab_width) / tab_width) * tab_width; | |
267 | col += post_tab; | |
268 | } | |
269 | ||
270 | last_known_column = col; | |
271 | last_known_column_point = point; | |
272 | last_known_column_modified = MODIFF; | |
273 | ||
274 | return col; | |
275 | } | |
276 | \f | |
c412c808 RS |
277 | /* Return the width in columns of the part of STRING from BEG to END. |
278 | If BEG is nil, that stands for the beginning of STRING. | |
279 | If END is nil, that stands for the end of STRING. */ | |
280 | ||
281 | static int | |
382ac0bd | 282 | string_display_width (string, beg, end) |
c412c808 RS |
283 | Lisp_Object string, beg, end; |
284 | { | |
285 | register int col; | |
286 | register unsigned char *ptr, *stop; | |
287 | register int tab_seen; | |
288 | int post_tab; | |
289 | register int c; | |
290 | register int tab_width = XINT (current_buffer->tab_width); | |
291 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); | |
292 | register struct Lisp_Vector *dp = buffer_display_table (); | |
293 | int b, e; | |
294 | ||
295 | if (NILP (end)) | |
296 | e = XSTRING (string)->size; | |
297 | else | |
298 | { | |
299 | CHECK_NUMBER (end, 0); | |
300 | e = XINT (end); | |
301 | } | |
302 | ||
303 | if (NILP (beg)) | |
304 | b = 0; | |
305 | else | |
306 | { | |
307 | CHECK_NUMBER (beg, 0); | |
308 | b = XINT (beg); | |
309 | } | |
310 | ||
311 | /* Make a pointer for decrementing through the chars before point. */ | |
312 | ptr = XSTRING (string)->data + e; | |
313 | /* Make a pointer to where consecutive chars leave off, | |
314 | going backwards from point. */ | |
315 | stop = XSTRING (string)->data + b; | |
316 | ||
317 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
318 | ||
319 | col = 0, tab_seen = 0, post_tab = 0; | |
320 | ||
321 | while (1) | |
322 | { | |
323 | if (ptr == stop) | |
324 | break; | |
325 | ||
326 | c = *--ptr; | |
327 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
328 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
329 | else if (c >= 040 && c < 0177) | |
330 | col++; | |
331 | else if (c == '\n') | |
332 | break; | |
333 | else if (c == '\t') | |
334 | { | |
335 | if (tab_seen) | |
336 | col = ((col + tab_width) / tab_width) * tab_width; | |
337 | ||
338 | post_tab += col; | |
339 | col = 0; | |
340 | tab_seen = 1; | |
341 | } | |
342 | else | |
343 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
344 | } | |
345 | ||
346 | if (tab_seen) | |
347 | { | |
348 | col = ((col + tab_width) / tab_width) * tab_width; | |
349 | col += post_tab; | |
350 | } | |
351 | ||
352 | return col; | |
353 | } | |
354 | \f | |
993b6404 JB |
355 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
356 | "Indent from point with tabs and spaces until COLUMN is reached.\n\ | |
357 | Optional second argument MIN says always do at least MIN spaces\n\ | |
358 | even if that goes past COLUMN; by default, MIN is zero.") | |
359 | (col, minimum) | |
360 | Lisp_Object col, minimum; | |
361 | { | |
362 | int mincol; | |
363 | register int fromcol; | |
364 | register int tab_width = XINT (current_buffer->tab_width); | |
365 | ||
366 | CHECK_NUMBER (col, 0); | |
56a98455 | 367 | if (NILP (minimum)) |
94d92e9c | 368 | XSETFASTINT (minimum, 0); |
993b6404 JB |
369 | CHECK_NUMBER (minimum, 1); |
370 | ||
371 | fromcol = current_column (); | |
372 | mincol = fromcol + XINT (minimum); | |
373 | if (mincol < XINT (col)) mincol = XINT (col); | |
374 | ||
375 | if (fromcol == mincol) | |
376 | return make_number (mincol); | |
377 | ||
ccdcf1f5 | 378 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
379 | |
380 | if (indent_tabs_mode) | |
381 | { | |
382 | Lisp_Object n; | |
94d92e9c | 383 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
384 | if (XFASTINT (n) != 0) |
385 | { | |
6d1bd1a5 | 386 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
387 | |
388 | fromcol = (mincol / tab_width) * tab_width; | |
389 | } | |
390 | } | |
391 | ||
94d92e9c | 392 | XSETFASTINT (col, mincol - fromcol); |
6d1bd1a5 | 393 | Finsert_char (make_number (' '), col, Qt); |
993b6404 JB |
394 | |
395 | last_known_column = mincol; | |
396 | last_known_column_point = point; | |
397 | last_known_column_modified = MODIFF; | |
398 | ||
399 | XSETINT (col, mincol); | |
400 | return col; | |
401 | } | |
0aa01123 | 402 | |
993b6404 JB |
403 | \f |
404 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, | |
405 | 0, 0, 0, | |
406 | "Return the indentation of the current line.\n\ | |
407 | This is the horizontal position of the character\n\ | |
408 | following any initial whitespace.") | |
409 | () | |
410 | { | |
411 | Lisp_Object val; | |
412 | ||
94d92e9c | 413 | XSETFASTINT (val, position_indentation (find_next_newline (point, -1))); |
993b6404 JB |
414 | return val; |
415 | } | |
416 | ||
417 | position_indentation (pos) | |
418 | register int pos; | |
419 | { | |
420 | register int column = 0; | |
421 | register int tab_width = XINT (current_buffer->tab_width); | |
422 | register unsigned char *p; | |
423 | register unsigned char *stop; | |
2ff4775b | 424 | |
ccdcf1f5 | 425 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
2ff4775b | 426 | |
993b6404 JB |
427 | stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1; |
428 | p = &FETCH_CHAR (pos); | |
429 | while (1) | |
430 | { | |
431 | while (p == stop) | |
432 | { | |
433 | if (pos == ZV) | |
434 | return column; | |
435 | pos += p - &FETCH_CHAR (pos); | |
436 | p = &FETCH_CHAR (pos); | |
437 | stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1; | |
438 | } | |
439 | switch (*p++) | |
440 | { | |
441 | case ' ': | |
442 | column++; | |
443 | break; | |
444 | case '\t': | |
445 | column += tab_width - column % tab_width; | |
446 | break; | |
447 | default: | |
448 | return column; | |
449 | } | |
450 | } | |
451 | } | |
1b15e576 KH |
452 | |
453 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
454 | Blank lines are treated as if they had the same indentation as the | |
455 | preceding line. */ | |
456 | int | |
457 | indented_beyond_p (pos, column) | |
458 | int pos, column; | |
459 | { | |
460 | while (pos > BEGV && FETCH_CHAR (pos) == '\n') | |
04d25c3d | 461 | pos = find_next_newline_no_quit (pos - 1, -1); |
1b15e576 KH |
462 | return (position_indentation (pos) >= column); |
463 | } | |
0aa01123 | 464 | |
993b6404 JB |
465 | \f |
466 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, 0, | |
467 | "Move point to column COLUMN in the current line.\n\ | |
468 | The column of a character is calculated by adding together the widths\n\ | |
469 | as displayed of the previous characters in the line.\n\ | |
470 | This function ignores line-continuation;\n\ | |
471 | there is no upper limit on the column number a character can have\n\ | |
230a4cbd JB |
472 | and horizontal scrolling has no effect.\n\ |
473 | \n\ | |
993b6404 JB |
474 | If specified column is within a character, point goes after that character.\n\ |
475 | If it's past end of line, point goes to end of line.\n\n\ | |
476 | A non-nil second (optional) argument FORCE means, if the line\n\ | |
477 | is too short to reach column COLUMN then add spaces/tabs to get there,\n\ | |
478 | and if COLUMN is in the middle of a tab character, change it to spaces.") | |
479 | (column, force) | |
480 | Lisp_Object column, force; | |
481 | { | |
482 | register int pos; | |
483 | register int col = current_column (); | |
484 | register int goal; | |
485 | register int end; | |
486 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 487 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
993b6404 JB |
488 | register struct Lisp_Vector *dp = buffer_display_table (); |
489 | ||
490 | Lisp_Object val; | |
491 | int prev_col; | |
492 | int c; | |
493 | ||
ccdcf1f5 | 494 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
495 | CHECK_NATNUM (column, 0); |
496 | goal = XINT (column); | |
497 | ||
498 | retry: | |
499 | pos = point; | |
500 | end = ZV; | |
501 | ||
502 | /* If we're starting past the desired column, | |
503 | back up to beginning of line and scan from there. */ | |
504 | if (col > goal) | |
505 | { | |
506 | pos = find_next_newline (pos, -1); | |
507 | col = 0; | |
508 | } | |
509 | ||
510 | while (col < goal && pos < end) | |
511 | { | |
512 | c = FETCH_CHAR (pos); | |
f845b8b2 RS |
513 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
514 | { | |
515 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
516 | pos++; | |
0088a46e | 517 | continue; |
f845b8b2 | 518 | } |
993b6404 JB |
519 | if (c == '\n') |
520 | break; | |
521 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
522 | break; | |
523 | pos++; | |
524 | if (c == '\t') | |
525 | { | |
526 | prev_col = col; | |
527 | col += tab_width; | |
528 | col = col / tab_width * tab_width; | |
529 | } | |
993b6404 | 530 | else if (ctl_arrow && (c < 040 || c == 0177)) |
bbc2998f | 531 | col += 2; |
993b6404 | 532 | else if (c < 040 || c >= 0177) |
bbc2998f | 533 | col += 4; |
993b6404 JB |
534 | else |
535 | col++; | |
536 | } | |
537 | ||
538 | SET_PT (pos); | |
539 | ||
540 | /* If a tab char made us overshoot, change it to spaces | |
541 | and scan through it again. */ | |
56a98455 | 542 | if (!NILP (force) && col > goal && c == '\t' && prev_col < goal) |
993b6404 | 543 | { |
70ee42f7 JB |
544 | int old_point; |
545 | ||
993b6404 | 546 | del_range (point - 1, point); |
70ee42f7 JB |
547 | Findent_to (make_number (goal), Qnil); |
548 | old_point = point; | |
549 | Findent_to (make_number (col), Qnil); | |
550 | SET_PT (old_point); | |
5a05d3d2 RS |
551 | /* Set the last_known... vars consistently. */ |
552 | col = goal; | |
993b6404 JB |
553 | } |
554 | ||
555 | /* If line ends prematurely, add space to the end. */ | |
56a98455 | 556 | if (col < goal && !NILP (force)) |
230a4cbd | 557 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
558 | |
559 | last_known_column = col; | |
560 | last_known_column_point = point; | |
561 | last_known_column_modified = MODIFF; | |
562 | ||
94d92e9c | 563 | XSETFASTINT (val, col); |
993b6404 JB |
564 | return val; |
565 | } | |
0aa01123 | 566 | |
993b6404 | 567 | \f |
0aa01123 JB |
568 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
569 | ||
993b6404 JB |
570 | struct position val_compute_motion; |
571 | ||
572 | /* Scan the current buffer forward from offset FROM, pretending that | |
573 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
574 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
575 | and return the ending buffer position and screen location. If we |
576 | can't hit the requested column exactly (because of a tab or other | |
577 | multi-column character), overshoot. | |
993b6404 | 578 | |
2ab90d49 KH |
579 | DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings |
580 | at FROM. This is the case if FROMVPOS and FROMVPOS came from an | |
581 | earlier call to compute_motion. The other common case is that FROMHPOS | |
582 | is zero and FROM is a position that "belongs" at column zero, but might | |
583 | be shifted by overlay strings; in this case DID_MOTION should be 0. | |
584 | ||
993b6404 JB |
585 | WIDTH is the number of columns available to display text; |
586 | compute_motion uses this to handle continuation lines and such. | |
587 | HSCROLL is the number of columns not being displayed at the left | |
588 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
589 | TAB_OFFSET is the number of columns of the first tab that aren't |
590 | being displayed, perhaps because of a continuation line or | |
591 | something. | |
993b6404 JB |
592 | |
593 | compute_motion returns a pointer to a struct position. The bufpos | |
594 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
595 | and vpos give its cartesian location. prevhpos is the column at |
596 | which the character before bufpos started, and contin is non-zero | |
597 | if we reached the current line by continuing the previous. | |
598 | ||
599 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
600 | columns, taking HSCROLL and the truncation glyph at the left margin | |
601 | into account. That is, beginning-of-line moves you to the hpos | |
602 | -HSCROLL + (HSCROLL > 0). | |
993b6404 | 603 | |
1827d036 KH |
604 | Note that FROMHPOS and TOHPOS should be expressed in real screen |
605 | columns, taking HSCROLL and the truncation glyph at the left margin | |
606 | into account. That is, beginning-of-line moves you to the hpos | |
607 | -HSCROLL + (HSCROLL > 0). | |
608 | ||
993b6404 JB |
609 | For example, to find the buffer position of column COL of line LINE |
610 | of a certain window, pass the window's starting location as FROM | |
611 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
612 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
613 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
2ff4775b | 614 | TOHPOS. |
993b6404 JB |
615 | |
616 | When displaying in window w, a typical formula for WIDTH is: | |
617 | ||
618 | window_width - 1 | |
a3c87d4e | 619 | - (has_vertical_scroll_bars |
40284d6b | 620 | ? FRAME_SCROLL_BAR_COLS (XFRAME (window->frame)) |
fa61c701 | 621 | : (window_width + window_left != frame_width)) |
993b6404 JB |
622 | |
623 | where | |
624 | window_width is XFASTINT (w->width), | |
625 | window_left is XFASTINT (w->left), | |
a3c87d4e JB |
626 | has_vertical_scroll_bars is |
627 | FRAME_HAS_VERTICAL_SCROLL_BARS (XFRAME (WINDOW_FRAME (window))) | |
fa61c701 | 628 | and frame_width = FRAME_WIDTH (XFRAME (window->frame)) |
993b6404 | 629 | |
1827d036 KH |
630 | Or you can let window_internal_width do this all for you, and write: |
631 | window_internal_width (w) - 1 | |
fa61c701 JB |
632 | |
633 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 634 | accounts for window borders if the window is split horizontally, and |
1827d036 | 635 | the scroll bars if they are turned on. */ |
993b6404 JB |
636 | |
637 | struct position * | |
2ab90d49 | 638 | compute_motion (from, fromvpos, fromhpos, did_motion, to, tovpos, tohpos, width, hscroll, tab_offset, win) |
993b6404 | 639 | int from, fromvpos, fromhpos, to, tovpos, tohpos; |
2ab90d49 | 640 | int did_motion; |
993b6404 JB |
641 | register int width; |
642 | int hscroll, tab_offset; | |
88af3af4 | 643 | struct window *win; |
993b6404 | 644 | { |
cde9337b JB |
645 | register int hpos = fromhpos; |
646 | register int vpos = fromvpos; | |
647 | ||
993b6404 JB |
648 | register int pos; |
649 | register int c; | |
650 | register int tab_width = XFASTINT (current_buffer->tab_width); | |
56a98455 | 651 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
88af3af4 | 652 | register struct Lisp_Vector *dp = window_display_table (win); |
993b6404 | 653 | int selective |
eeaafd4f | 654 | = (INTEGERP (current_buffer->selective_display) |
69eaf10d RS |
655 | ? XINT (current_buffer->selective_display) |
656 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
0aa01123 | 657 | int prev_vpos = vpos, prev_hpos = 0; |
993b6404 | 658 | int selective_rlen |
eeaafd4f | 659 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
dea4d2e6 | 660 | ? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0); |
2ab90d49 KH |
661 | /* The next location where the `invisible' property changes, or an |
662 | overlay starts or ends. */ | |
663 | int next_boundary = from; | |
993b6404 | 664 | |
0aa01123 JB |
665 | /* For computing runs of characters with similar widths. |
666 | Invariant: width_run_width is zero, or all the characters | |
2ff4775b | 667 | from width_run_start to width_run_end have a fixed width of |
0aa01123 JB |
668 | width_run_width. */ |
669 | int width_run_start = from; | |
670 | int width_run_end = from; | |
671 | int width_run_width = 0; | |
672 | Lisp_Object *width_table; | |
66c75ca5 | 673 | Lisp_Object buffer; |
0aa01123 JB |
674 | |
675 | /* The next buffer pos where we should consult the width run cache. */ | |
676 | int next_width_run = from; | |
677 | ||
66c75ca5 RS |
678 | XSETBUFFER (buffer, current_buffer); |
679 | ||
0aa01123 JB |
680 | width_run_cache_on_off (); |
681 | if (dp == buffer_display_table ()) | |
682 | width_table = (VECTORP (current_buffer->width_table) | |
683 | ? XVECTOR (current_buffer->width_table)->contents | |
684 | : 0); | |
685 | else | |
686 | /* If the window has its own display table, we can't use the width | |
687 | run cache, because that's based on the buffer's display table. */ | |
688 | width_table = 0; | |
689 | ||
ccdcf1f5 | 690 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
cde9337b | 691 | |
2ab90d49 KH |
692 | pos = from; |
693 | while (1) | |
694 | { | |
695 | while (pos == next_boundary) | |
f75c0f8a | 696 | { |
2ab90d49 KH |
697 | /* If the caller says that the screen position came from an earlier |
698 | call to compute_motion, then we've already accounted for the | |
699 | overlay strings at point. This is only true the first time | |
700 | through, so clear the flag after testing it. */ | |
701 | if (!did_motion) | |
702 | /* We need to skip past the overlay strings. Currently those | |
703 | strings must contain single-column printing characters; | |
704 | if we want to relax that restriction, something will have | |
705 | to be changed here. */ | |
706 | hpos += overlay_strings (pos, win, (char **)0); | |
707 | did_motion = 0; | |
708 | ||
709 | if (pos >= to) | |
710 | break; | |
66c75ca5 | 711 | |
f75c0f8a | 712 | { |
2ab90d49 KH |
713 | Lisp_Object prop, position, end, limit, proplimit; |
714 | ||
715 | XSETFASTINT (position, pos); | |
716 | ||
717 | /* Give faster response for overlay lookup near POS. */ | |
718 | recenter_overlay_lists (current_buffer, pos); | |
f75c0f8a | 719 | |
f845b8b2 RS |
720 | /* We must not advance farther than the next overlay change. |
721 | The overlay change might change the invisible property; | |
2ab90d49 | 722 | or there might be overlay strings to be displayed there. */ |
7ea9c020 | 723 | limit = Fnext_overlay_change (position); |
f845b8b2 RS |
724 | /* As for text properties, this gives a lower bound |
725 | for where the invisible text property could change. */ | |
66c75ca5 | 726 | proplimit = Fnext_property_change (position, buffer, Qt); |
f845b8b2 RS |
727 | if (XFASTINT (limit) < XFASTINT (proplimit)) |
728 | proplimit = limit; | |
729 | /* PROPLIMIT is now a lower bound for the next change | |
66c75ca5 RS |
730 | in invisible status. If that is plenty far away, |
731 | use that lower bound. */ | |
f845b8b2 | 732 | if (XFASTINT (proplimit) > pos + 100 || XFASTINT (proplimit) >= to) |
2ab90d49 | 733 | next_boundary = XFASTINT (proplimit); |
66c75ca5 | 734 | /* Otherwise, scan for the next `invisible' property change. */ |
f75c0f8a | 735 | else |
66c75ca5 RS |
736 | { |
737 | /* Don't scan terribly far. */ | |
f845b8b2 RS |
738 | XSETFASTINT (proplimit, min (pos + 100, to)); |
739 | /* No matter what. don't go past next overlay change. */ | |
740 | if (XFASTINT (limit) < XFASTINT (proplimit)) | |
741 | proplimit = limit; | |
66c75ca5 | 742 | end = Fnext_single_property_change (position, Qinvisible, |
f845b8b2 | 743 | buffer, proplimit); |
2ab90d49 | 744 | next_boundary = XFASTINT (end); |
66c75ca5 | 745 | } |
2ab90d49 KH |
746 | /* if the `invisible' property is set, we can skip to |
747 | the next property change */ | |
748 | prop = Fget_char_property (position, Qinvisible, | |
749 | Fcurrent_buffer ()); | |
66c75ca5 | 750 | if (TEXT_PROP_MEANS_INVISIBLE (prop)) |
2ab90d49 | 751 | pos = next_boundary; |
f75c0f8a RS |
752 | } |
753 | } | |
2ab90d49 KH |
754 | |
755 | /* Handle right margin. */ | |
756 | if (hpos >= width | |
757 | && (hpos > width | |
758 | || (pos < ZV && FETCH_CHAR (pos) != '\n'))) | |
759 | { | |
760 | if (hscroll | |
761 | || (truncate_partial_width_windows | |
762 | && width + 1 < FRAME_WIDTH (XFRAME (WINDOW_FRAME (win)))) | |
763 | || !NILP (current_buffer->truncate_lines)) | |
764 | { | |
765 | /* Truncating: skip to newline. */ | |
766 | pos = find_before_next_newline (pos, to, 1); | |
767 | hpos = width; | |
768 | } | |
769 | else | |
770 | { | |
771 | /* Continuing. */ | |
772 | vpos += hpos / width; | |
773 | tab_offset += hpos - hpos % width; | |
774 | hpos %= width; | |
775 | } | |
776 | } | |
777 | ||
778 | /* Stop if past the target buffer position or screen position. */ | |
5a05d3d2 RS |
779 | if (pos >= to) |
780 | break; | |
2ab90d49 KH |
781 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
782 | break; | |
783 | ||
784 | prev_vpos = vpos; | |
785 | prev_hpos = hpos; | |
0aa01123 JB |
786 | |
787 | /* Consult the width run cache to see if we can avoid inspecting | |
788 | the text character-by-character. */ | |
789 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
790 | { | |
791 | int run_end; | |
792 | int common_width | |
793 | = region_cache_forward (current_buffer, | |
794 | current_buffer->width_run_cache, | |
795 | pos, &run_end); | |
796 | ||
797 | /* A width of zero means the character's width varies (like | |
798 | a tab), is meaningless (like a newline), or we just don't | |
799 | want to skip over it for some other reason. */ | |
800 | if (common_width != 0) | |
801 | { | |
802 | int run_end_hpos; | |
803 | ||
804 | /* Don't go past the final buffer posn the user | |
805 | requested. */ | |
806 | if (run_end > to) | |
807 | run_end = to; | |
808 | ||
809 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
810 | ||
811 | /* Don't go past the final horizontal position the user | |
812 | requested. */ | |
813 | if (vpos == tovpos && run_end_hpos > tohpos) | |
814 | { | |
815 | run_end = pos + (tohpos - hpos) / common_width; | |
816 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
817 | } | |
2ff4775b | 818 | |
0aa01123 JB |
819 | /* Don't go past the margin. */ |
820 | if (run_end_hpos >= width) | |
821 | { | |
822 | run_end = pos + (width - hpos) / common_width; | |
823 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
824 | } | |
825 | ||
826 | hpos = run_end_hpos; | |
827 | if (run_end > pos) | |
828 | prev_hpos = hpos - common_width; | |
829 | pos = run_end; | |
830 | } | |
831 | ||
832 | next_width_run = run_end + 1; | |
833 | } | |
834 | ||
835 | /* We have to scan the text character-by-character. */ | |
993b6404 | 836 | else |
2ab90d49 KH |
837 | { |
838 | c = FETCH_CHAR (pos); | |
839 | pos++; | |
0aa01123 | 840 | |
2ab90d49 KH |
841 | /* Perhaps add some info to the width_run_cache. */ |
842 | if (current_buffer->width_run_cache) | |
843 | { | |
844 | /* Is this character part of the current run? If so, extend | |
845 | the run. */ | |
846 | if (pos - 1 == width_run_end | |
847 | && width_table[c] == width_run_width) | |
848 | width_run_end = pos; | |
849 | ||
850 | /* The previous run is over, since this is a character at a | |
851 | different position, or a different width. */ | |
852 | else | |
853 | { | |
854 | /* Have we accumulated a run to put in the cache? | |
855 | (Currently, we only cache runs of width == 1). */ | |
856 | if (width_run_start < width_run_end | |
857 | && width_run_width == 1) | |
858 | know_region_cache (current_buffer, | |
859 | current_buffer->width_run_cache, | |
860 | width_run_start, width_run_end); | |
861 | ||
862 | /* Start recording a new width run. */ | |
863 | width_run_width = width_table[c]; | |
864 | width_run_start = pos - 1; | |
865 | width_run_end = pos; | |
866 | } | |
867 | } | |
993b6404 | 868 | |
2ab90d49 KH |
869 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
870 | hpos += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
871 | else if (c >= 040 && c < 0177) | |
872 | hpos++; | |
873 | else if (c == '\t') | |
993b6404 | 874 | { |
2ab90d49 KH |
875 | int tem = (hpos + tab_offset + hscroll - (hscroll > 0)) % tab_width; |
876 | if (tem < 0) | |
877 | tem += tab_width; | |
878 | hpos += tab_width - tem; | |
993b6404 | 879 | } |
2ab90d49 | 880 | else if (c == '\n') |
993b6404 | 881 | { |
2ab90d49 KH |
882 | if (selective > 0 && indented_beyond_p (pos, selective)) |
883 | { | |
884 | /* Skip any number of invisible lines all at once */ | |
885 | do | |
886 | pos = find_before_next_newline (pos, to, 1) + 1; | |
887 | while (pos < to | |
888 | && indented_beyond_p (pos, selective)); | |
889 | /* Allow for the " ..." that is displayed for them. */ | |
890 | if (selective_rlen) | |
891 | { | |
892 | hpos += selective_rlen; | |
893 | if (hpos >= width) | |
894 | hpos = width; | |
895 | } | |
896 | --pos; | |
897 | /* We have skipped the invis text, but not the | |
898 | newline after. */ | |
899 | } | |
900 | else | |
901 | { | |
902 | /* A visible line. */ | |
903 | vpos++; | |
904 | hpos = 0; | |
905 | hpos -= hscroll; | |
906 | /* Count the truncation glyph on column 0 */ | |
907 | if (hscroll > 0) | |
908 | hpos++; | |
909 | tab_offset = 0; | |
910 | } | |
993b6404 | 911 | } |
2ab90d49 KH |
912 | else if (c == CR && selective < 0) |
913 | { | |
914 | /* In selective display mode, | |
915 | everything from a ^M to the end of the line is invisible. | |
916 | Stop *before* the real newline. */ | |
917 | pos = find_before_next_newline (pos, to, 1); | |
918 | /* Allow for the " ..." that is displayed for them. */ | |
919 | if (selective_rlen) | |
920 | { | |
921 | hpos += selective_rlen; | |
922 | if (hpos >= width) | |
923 | hpos = width; | |
924 | } | |
925 | } | |
926 | else | |
927 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
993b6404 JB |
928 | } |
929 | } | |
930 | ||
0aa01123 JB |
931 | /* Remember any final width run in the cache. */ |
932 | if (current_buffer->width_run_cache | |
933 | && width_run_width == 1 | |
934 | && width_run_start < width_run_end) | |
935 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
936 | width_run_start, width_run_end); | |
937 | ||
993b6404 | 938 | val_compute_motion.bufpos = pos; |
cde9337b JB |
939 | val_compute_motion.hpos = hpos; |
940 | val_compute_motion.vpos = vpos; | |
941 | val_compute_motion.prevhpos = prev_hpos; | |
993b6404 JB |
942 | |
943 | /* Nonzero if have just continued a line */ | |
944 | val_compute_motion.contin | |
cde9337b JB |
945 | = (pos != from |
946 | && (val_compute_motion.vpos != prev_vpos) | |
947 | && c != '\n'); | |
993b6404 JB |
948 | |
949 | return &val_compute_motion; | |
950 | } | |
993b6404 | 951 | |
992371ca KH |
952 | #if 0 /* The doc string is too long for some compilers, |
953 | but make-docfile can find it in this comment. */ | |
88af3af4 | 954 | DEFUN ("compute-motion", Ffoo, Sfoo, 7, 7, 0, |
42918ba5 RS |
955 | "Scan through the current buffer, calculating screen position.\n\ |
956 | Scan the current buffer forward from offset FROM,\n\ | |
957 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)--\n\ | |
958 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)--\n\ | |
959 | and return the ending buffer position and screen location.\n\ | |
960 | \n\ | |
88af3af4 | 961 | There are three additional arguments:\n\ |
42918ba5 RS |
962 | \n\ |
963 | WIDTH is the number of columns available to display text;\n\ | |
964 | this affects handling of continuation lines.\n\ | |
992371ca KH |
965 | This is usually the value returned by `window-width', less one (to allow\n\ |
966 | for the continuation glyph).\n\ | |
42918ba5 RS |
967 | \n\ |
968 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET).\n\ | |
969 | HSCROLL is the number of columns not being displayed at the left\n\ | |
970 | margin; this is usually taken from a window's hscroll member.\n\ | |
971 | TAB-OFFSET is the number of columns of the first tab that aren't\n\ | |
972 | being displayed, perhaps because the line was continued within it.\n\ | |
4fb76787 | 973 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero.\n\ |
69eaf10d | 974 | \n\ |
88af3af4 | 975 | WINDOW is the window to operate on. Currently this is used only to\n\ |
69eaf10d RS |
976 | find the display table. It does not matter what buffer WINDOW displays;\n\ |
977 | `compute-motion' always operates on the current buffer.\n\ | |
42918ba5 RS |
978 | \n\ |
979 | The value is a list of five elements:\n\ | |
faa5c515 | 980 | (POS HPOS VPOS PREVHPOS CONTIN)\n\ |
42918ba5 RS |
981 | POS is the buffer position where the scan stopped.\n\ |
982 | VPOS is the vertical position where the scan stopped.\n\ | |
983 | HPOS is the horizontal position where the scan stopped.\n\ | |
984 | \n\ | |
985 | PREVHPOS is the horizontal position one character back from POS.\n\ | |
986 | CONTIN is t if a line was continued after (or within) the previous character.\n\ | |
987 | \n\ | |
988 | For example, to find the buffer position of column COL of line LINE\n\ | |
989 | of a certain window, pass the window's starting location as FROM\n\ | |
990 | and the window's upper-left coordinates as FROMPOS.\n\ | |
991 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the\n\ | |
992 | visible section of the buffer, and pass LINE and COL as TOPOS.") | |
5844e1c4 | 993 | (from, frompos, to, topos, width, offsets, window) |
992371ca KH |
994 | #endif |
995 | ||
88af3af4 | 996 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
992371ca | 997 | 0) |
88af3af4 | 998 | (from, frompos, to, topos, width, offsets, window) |
42918ba5 | 999 | Lisp_Object from, frompos, to, topos; |
88af3af4 | 1000 | Lisp_Object width, offsets, window; |
42918ba5 RS |
1001 | { |
1002 | Lisp_Object bufpos, hpos, vpos, prevhpos, contin; | |
1003 | struct position *pos; | |
1004 | int hscroll, tab_offset; | |
1005 | ||
26a8d14b | 1006 | CHECK_NUMBER_COERCE_MARKER (from, 0); |
42918ba5 | 1007 | CHECK_CONS (frompos, 0); |
26a8d14b KH |
1008 | CHECK_NUMBER (XCONS (frompos)->car, 0); |
1009 | CHECK_NUMBER (XCONS (frompos)->cdr, 0); | |
1010 | CHECK_NUMBER_COERCE_MARKER (to, 0); | |
42918ba5 | 1011 | CHECK_CONS (topos, 0); |
26a8d14b KH |
1012 | CHECK_NUMBER (XCONS (topos)->car, 0); |
1013 | CHECK_NUMBER (XCONS (topos)->cdr, 0); | |
1014 | CHECK_NUMBER (width, 0); | |
42918ba5 RS |
1015 | if (!NILP (offsets)) |
1016 | { | |
1017 | CHECK_CONS (offsets, 0); | |
26a8d14b KH |
1018 | CHECK_NUMBER (XCONS (offsets)->car, 0); |
1019 | CHECK_NUMBER (XCONS (offsets)->cdr, 0); | |
42918ba5 RS |
1020 | hscroll = XINT (XCONS (offsets)->car); |
1021 | tab_offset = XINT (XCONS (offsets)->cdr); | |
1022 | } | |
1023 | else | |
1024 | hscroll = tab_offset = 0; | |
1025 | ||
88af3af4 KH |
1026 | if (NILP (window)) |
1027 | window = Fselected_window (); | |
1028 | else | |
1029 | CHECK_LIVE_WINDOW (window, 0); | |
1030 | ||
42918ba5 | 1031 | pos = compute_motion (XINT (from), XINT (XCONS (frompos)->cdr), |
2ab90d49 | 1032 | XINT (XCONS (frompos)->car), 0, |
42918ba5 RS |
1033 | XINT (to), XINT (XCONS (topos)->cdr), |
1034 | XINT (XCONS (topos)->car), | |
88af3af4 KH |
1035 | XINT (width), hscroll, tab_offset, |
1036 | XWINDOW (window)); | |
42918ba5 | 1037 | |
94d92e9c | 1038 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
1039 | XSETINT (hpos, pos->hpos); |
1040 | XSETINT (vpos, pos->vpos); | |
1041 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
1042 | |
1043 | return Fcons (bufpos, | |
1044 | Fcons (hpos, | |
1045 | Fcons (vpos, | |
1046 | Fcons (prevhpos, | |
1047 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
1048 | ||
1049 | } | |
993b6404 | 1050 | \f |
0aa01123 JB |
1051 | /* Return the column of position POS in window W's buffer. |
1052 | The result is rounded down to a multiple of the internal width of W. | |
993b6404 JB |
1053 | This is the amount of indentation of position POS |
1054 | that is not visible in its horizontal position in the window. */ | |
1055 | ||
1056 | int | |
1057 | pos_tab_offset (w, pos) | |
1058 | struct window *w; | |
1059 | register int pos; | |
1060 | { | |
3d94e943 | 1061 | int opoint = PT; |
993b6404 | 1062 | int col; |
fa61c701 | 1063 | int width = window_internal_width (w) - 1; |
993b6404 JB |
1064 | |
1065 | if (pos == BEGV || FETCH_CHAR (pos - 1) == '\n') | |
1066 | return 0; | |
3d94e943 | 1067 | TEMP_SET_PT (pos); |
993b6404 | 1068 | col = current_column (); |
3d94e943 | 1069 | TEMP_SET_PT (opoint); |
993b6404 JB |
1070 | return col - (col % width); |
1071 | } | |
1072 | ||
0aa01123 JB |
1073 | \f |
1074 | /* Fvertical_motion and vmotion */ | |
993b6404 JB |
1075 | struct position val_vmotion; |
1076 | ||
1077 | struct position * | |
99ce22d5 KH |
1078 | vmotion (from, vtarget, w) |
1079 | register int from, vtarget; | |
1080 | struct window *w; | |
993b6404 | 1081 | { |
99ce22d5 KH |
1082 | int width = window_internal_width (w) - 1; |
1083 | int hscroll = XINT (w->hscroll); | |
993b6404 JB |
1084 | struct position pos; |
1085 | /* vpos is cumulative vertical position, changed as from is changed */ | |
1086 | register int vpos = 0; | |
92992c7e | 1087 | Lisp_Object prevline; |
993b6404 JB |
1088 | register int first; |
1089 | int lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
1090 | int selective | |
eeaafd4f KH |
1091 | = (INTEGERP (current_buffer->selective_display) |
1092 | ? XINT (current_buffer->selective_display) | |
1093 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
99ce22d5 KH |
1094 | Lisp_Object window; |
1095 | int start_hpos = 0; | |
2ab90d49 | 1096 | int did_motion; |
99ce22d5 KH |
1097 | |
1098 | XSETWINDOW (window, w); | |
1099 | ||
cb1068e5 | 1100 | /* The omission of the clause |
99ce22d5 | 1101 | && marker_position (w->start) == BEG |
cb1068e5 KH |
1102 | here is deliberate; I think we want to measure from the prompt |
1103 | position even if the minibuffer window has scrolled. */ | |
c412c808 RS |
1104 | if (EQ (window, minibuf_window)) |
1105 | { | |
39fc6077 | 1106 | if (minibuf_prompt_width == 0 && STRINGP (minibuf_prompt)) |
382ac0bd RS |
1107 | minibuf_prompt_width |
1108 | = string_display_width (minibuf_prompt, Qnil, Qnil); | |
c412c808 RS |
1109 | |
1110 | start_hpos = minibuf_prompt_width; | |
1111 | } | |
993b6404 | 1112 | |
99ce22d5 | 1113 | if (vpos >= vtarget) |
993b6404 | 1114 | { |
99ce22d5 KH |
1115 | /* To move upward, go a line at a time until |
1116 | we have gone at least far enough */ | |
1117 | ||
1118 | first = 1; | |
1119 | ||
1120 | while ((vpos > vtarget || first) && from > BEGV) | |
993b6404 | 1121 | { |
66c75ca5 RS |
1122 | Lisp_Object propval; |
1123 | ||
99ce22d5 | 1124 | XSETFASTINT (prevline, find_next_newline_no_quit (from - 1, -1)); |
92992c7e | 1125 | while (XFASTINT (prevline) > BEGV |
5a05d3d2 | 1126 | && ((selective > 0 |
92992c7e | 1127 | && indented_beyond_p (XFASTINT (prevline), selective)) |
5a05d3d2 RS |
1128 | #ifdef USE_TEXT_PROPERTIES |
1129 | /* watch out for newlines with `invisible' property */ | |
66c75ca5 RS |
1130 | || (propval = Fget_char_property (prevline, |
1131 | Qinvisible, | |
1132 | window), | |
1133 | TEXT_PROP_MEANS_INVISIBLE (propval)) | |
5a05d3d2 | 1134 | #endif |
99ce22d5 | 1135 | )) |
94d92e9c KH |
1136 | XSETFASTINT (prevline, |
1137 | find_next_newline_no_quit (XFASTINT (prevline) - 1, | |
1138 | -1)); | |
92992c7e | 1139 | pos = *compute_motion (XFASTINT (prevline), 0, |
99ce22d5 | 1140 | lmargin + (XFASTINT (prevline) == BEG |
92992c7e | 1141 | ? start_hpos : 0), |
2ab90d49 | 1142 | 0, |
cde9337b | 1143 | from, 1 << (INTBITS - 2), 0, |
99ce22d5 KH |
1144 | width, hscroll, 0, w); |
1145 | vpos -= pos.vpos; | |
1146 | first = 0; | |
1147 | from = XFASTINT (prevline); | |
993b6404 | 1148 | } |
99ce22d5 KH |
1149 | |
1150 | /* If we made exactly the desired vertical distance, | |
1151 | or if we hit beginning of buffer, | |
1152 | return point found */ | |
1153 | if (vpos >= vtarget) | |
993b6404 | 1154 | { |
99ce22d5 KH |
1155 | val_vmotion.bufpos = from; |
1156 | val_vmotion.vpos = vpos; | |
1157 | val_vmotion.hpos = lmargin; | |
1158 | val_vmotion.contin = 0; | |
1159 | val_vmotion.prevhpos = 0; | |
1160 | return &val_vmotion; | |
993b6404 | 1161 | } |
993b6404 | 1162 | |
99ce22d5 KH |
1163 | /* Otherwise find the correct spot by moving down */ |
1164 | } | |
1165 | /* Moving downward is simple, but must calculate from beg of line | |
1166 | to determine hpos of starting point */ | |
1167 | if (from > BEGV && FETCH_CHAR (from - 1) != '\n') | |
993b6404 | 1168 | { |
2ab90d49 | 1169 | Lisp_Object propval; |
66c75ca5 | 1170 | |
99ce22d5 KH |
1171 | XSETFASTINT (prevline, find_next_newline_no_quit (from, -1)); |
1172 | while (XFASTINT (prevline) > BEGV | |
1173 | && ((selective > 0 | |
1174 | && indented_beyond_p (XFASTINT (prevline), selective)) | |
5a05d3d2 | 1175 | #ifdef USE_TEXT_PROPERTIES |
99ce22d5 KH |
1176 | /* watch out for newlines with `invisible' property */ |
1177 | || (propval = Fget_char_property (prevline, Qinvisible, | |
1178 | window), | |
1179 | TEXT_PROP_MEANS_INVISIBLE (propval)) | |
5a05d3d2 | 1180 | #endif |
99ce22d5 KH |
1181 | )) |
1182 | XSETFASTINT (prevline, | |
1183 | find_next_newline_no_quit (XFASTINT (prevline) - 1, | |
1184 | -1)); | |
92992c7e | 1185 | pos = *compute_motion (XFASTINT (prevline), 0, |
99ce22d5 | 1186 | lmargin + (XFASTINT (prevline) == BEG |
92992c7e | 1187 | ? start_hpos : 0), |
2ab90d49 | 1188 | 0, |
cde9337b | 1189 | from, 1 << (INTBITS - 2), 0, |
99ce22d5 | 1190 | width, hscroll, 0, w); |
2ab90d49 | 1191 | did_motion = 1; |
993b6404 | 1192 | } |
99ce22d5 | 1193 | else |
993b6404 | 1194 | { |
99ce22d5 KH |
1195 | pos.hpos = lmargin + (from == BEG ? start_hpos : 0); |
1196 | pos.vpos = 0; | |
2ab90d49 | 1197 | did_motion = 0; |
993b6404 | 1198 | } |
2ab90d49 | 1199 | return compute_motion (from, vpos, pos.hpos, did_motion, |
99ce22d5 KH |
1200 | ZV, vtarget, - (1 << (INTBITS - 2)), |
1201 | width, hscroll, pos.vpos * width, w); | |
993b6404 JB |
1202 | } |
1203 | ||
f1ecfe9b | 1204 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
993b6404 JB |
1205 | "Move to start of screen line LINES lines down.\n\ |
1206 | If LINES is negative, this is moving up.\n\ | |
69eaf10d RS |
1207 | \n\ |
1208 | The optional second argument WINDOW specifies the window to use for\n\ | |
1209 | parameters such as width, horizontal scrolling, and so on.\n\ | |
1210 | the default is the selected window.\n\ | |
1211 | It does not matter what buffer is displayed in WINDOW.\n\ | |
1212 | `vertical-motion' always uses the current buffer.\n\ | |
1213 | \n\ | |
993b6404 | 1214 | Sets point to position found; this may be start of line\n\ |
69eaf10d | 1215 | or just the start of a continuation line.\n\ |
993b6404 | 1216 | Returns number of lines moved; may be closer to zero than LINES\n\ |
69eaf10d | 1217 | if beginning or end of buffer was reached.") |
f1ecfe9b RS |
1218 | (lines, window) |
1219 | Lisp_Object lines, window; | |
993b6404 JB |
1220 | { |
1221 | struct position pos; | |
993b6404 JB |
1222 | |
1223 | CHECK_NUMBER (lines, 0); | |
f1ecfe9b RS |
1224 | if (! NILP (window)) |
1225 | CHECK_WINDOW (window, 0); | |
1226 | else | |
92992c7e | 1227 | window = selected_window; |
993b6404 | 1228 | |
ef423eac | 1229 | pos = *vmotion (point, (int) XINT (lines), XWINDOW (window)); |
993b6404 JB |
1230 | |
1231 | SET_PT (pos.bufpos); | |
1232 | return make_number (pos.vpos); | |
1233 | } | |
1234 | \f | |
0aa01123 JB |
1235 | /* file's initialization. */ |
1236 | ||
993b6404 JB |
1237 | syms_of_indent () |
1238 | { | |
1239 | DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode, | |
1240 | "*Indentation can insert tabs if this is non-nil.\n\ | |
1241 | Setting this variable automatically makes it local to the current buffer."); | |
1242 | indent_tabs_mode = 1; | |
1243 | ||
1244 | defsubr (&Scurrent_indentation); | |
1245 | defsubr (&Sindent_to); | |
1246 | defsubr (&Scurrent_column); | |
1247 | defsubr (&Smove_to_column); | |
1248 | defsubr (&Svertical_motion); | |
42918ba5 | 1249 | defsubr (&Scompute_motion); |
993b6404 | 1250 | } |