Commit | Line | Data |
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993b6404 | 1 | /* Indentation functions. |
c6c5df7f | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1993 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 | ||
21 | #include "config.h" | |
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" |
993b6404 JB |
31 | |
32 | /* Indentation can insert tabs if this is non-zero; | |
33 | otherwise always uses spaces */ | |
34 | int indent_tabs_mode; | |
35 | ||
36 | #define min(a, b) ((a) < (b) ? (a) : (b)) | |
37 | #define max(a, b) ((a) > (b) ? (a) : (b)) | |
38 | ||
39 | #define CR 015 | |
40 | ||
41 | /* These three values memoize the current column to avoid recalculation */ | |
42 | /* Some things in set last_known_column_point to -1 | |
43 | to mark the memoized value as invalid */ | |
44 | /* Last value returned by current_column */ | |
45 | int last_known_column; | |
46 | /* Value of point when current_column was called */ | |
47 | int last_known_column_point; | |
48 | /* Value of MODIFF when current_column was called */ | |
49 | int last_known_column_modified; | |
50 | ||
993b6404 JB |
51 | /* Get the display table to use for the current buffer. */ |
52 | ||
53 | struct Lisp_Vector * | |
54 | buffer_display_table () | |
55 | { | |
56 | Lisp_Object thisbuf; | |
57 | ||
58 | thisbuf = current_buffer->display_table; | |
59 | if (XTYPE (thisbuf) == Lisp_Vector | |
60 | && XVECTOR (thisbuf)->size == DISP_TABLE_SIZE) | |
61 | return XVECTOR (thisbuf); | |
62 | if (XTYPE (Vstandard_display_table) == Lisp_Vector | |
63 | && XVECTOR (Vstandard_display_table)->size == DISP_TABLE_SIZE) | |
64 | return XVECTOR (Vstandard_display_table); | |
65 | return 0; | |
66 | } | |
67 | \f | |
68 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, | |
69 | "Return the horizontal position of point. Beginning of line is column 0.\n\ | |
70 | This is calculated by adding together the widths of all the displayed\n\ | |
71 | representations of the character between the start of the previous line\n\ | |
72 | and point. (eg control characters will have a width of 2 or 4, tabs\n\ | |
73 | will have a variable width)\n\ | |
502b9b64 JB |
74 | Ignores finite width of frame, which means that this function may return\n\ |
75 | values greater than (frame-width).\n\ | |
993b6404 JB |
76 | Whether the line is visible (if `selective-display' is t) has no effect;\n\ |
77 | however, ^M is treated as end of line when `selective-display' is t.") | |
78 | () | |
79 | { | |
80 | Lisp_Object temp; | |
81 | XFASTINT (temp) = current_column (); | |
82 | return temp; | |
83 | } | |
84 | ||
e74928fc JB |
85 | /* Cancel any recorded value of the horizontal position. */ |
86 | ||
87 | invalidate_current_column () | |
88 | { | |
89 | last_known_column_point = 0; | |
90 | } | |
91 | ||
993b6404 JB |
92 | int |
93 | current_column () | |
94 | { | |
95 | register int col; | |
96 | register unsigned char *ptr, *stop; | |
97 | register int tab_seen; | |
98 | int post_tab; | |
99 | register int c; | |
100 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 101 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
993b6404 JB |
102 | register struct Lisp_Vector *dp = buffer_display_table (); |
103 | int stopchar; | |
104 | ||
105 | if (point == last_known_column_point | |
106 | && MODIFF == last_known_column_modified) | |
107 | return last_known_column; | |
108 | ||
109 | /* Make a pointer for decrementing through the chars before point. */ | |
110 | ptr = &FETCH_CHAR (point - 1) + 1; | |
111 | /* Make a pointer to where consecutive chars leave off, | |
112 | going backwards from point. */ | |
113 | if (point == BEGV) | |
114 | stop = ptr; | |
115 | else if (point <= GPT || BEGV > GPT) | |
116 | stop = BEGV_ADDR; | |
117 | else | |
118 | stop = GAP_END_ADDR; | |
119 | ||
ccdcf1f5 | 120 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
121 | |
122 | col = 0, tab_seen = 0, post_tab = 0; | |
123 | ||
124 | while (1) | |
125 | { | |
126 | if (ptr == stop) | |
127 | { | |
128 | /* We stopped either for the beginning of the buffer | |
129 | or for the gap. */ | |
130 | if (ptr == BEGV_ADDR) | |
131 | break; | |
132 | /* It was the gap. Jump back over it. */ | |
133 | stop = BEGV_ADDR; | |
134 | ptr = GPT_ADDR; | |
135 | /* Check whether that brings us to beginning of buffer. */ | |
136 | if (BEGV >= GPT) break; | |
137 | } | |
138 | ||
139 | c = *--ptr; | |
140 | if (c >= 040 && c < 0177 | |
dea4d2e6 | 141 | && (dp == 0 || XTYPE (DISP_CHAR_VECTOR (dp, c)) != Lisp_Vector)) |
993b6404 JB |
142 | { |
143 | col++; | |
144 | } | |
145 | else if (c == '\n') | |
146 | break; | |
147 | else if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
148 | break; | |
149 | else if (c == '\t') | |
150 | { | |
151 | if (tab_seen) | |
152 | col = ((col + tab_width) / tab_width) * tab_width; | |
153 | ||
154 | post_tab += col; | |
155 | col = 0; | |
156 | tab_seen = 1; | |
157 | } | |
dea4d2e6 RS |
158 | else if (dp != 0 && XTYPE (DISP_CHAR_VECTOR (dp, c)) == Lisp_Vector) |
159 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
993b6404 JB |
160 | else |
161 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
162 | } | |
163 | ||
164 | if (tab_seen) | |
165 | { | |
166 | col = ((col + tab_width) / tab_width) * tab_width; | |
167 | col += post_tab; | |
168 | } | |
169 | ||
170 | last_known_column = col; | |
171 | last_known_column_point = point; | |
172 | last_known_column_modified = MODIFF; | |
173 | ||
174 | return col; | |
175 | } | |
176 | \f | |
177 | ||
178 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", | |
179 | "Indent from point with tabs and spaces until COLUMN is reached.\n\ | |
180 | Optional second argument MIN says always do at least MIN spaces\n\ | |
181 | even if that goes past COLUMN; by default, MIN is zero.") | |
182 | (col, minimum) | |
183 | Lisp_Object col, minimum; | |
184 | { | |
185 | int mincol; | |
186 | register int fromcol; | |
187 | register int tab_width = XINT (current_buffer->tab_width); | |
188 | ||
189 | CHECK_NUMBER (col, 0); | |
56a98455 | 190 | if (NILP (minimum)) |
993b6404 JB |
191 | XFASTINT (minimum) = 0; |
192 | CHECK_NUMBER (minimum, 1); | |
193 | ||
194 | fromcol = current_column (); | |
195 | mincol = fromcol + XINT (minimum); | |
196 | if (mincol < XINT (col)) mincol = XINT (col); | |
197 | ||
198 | if (fromcol == mincol) | |
199 | return make_number (mincol); | |
200 | ||
ccdcf1f5 | 201 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
202 | |
203 | if (indent_tabs_mode) | |
204 | { | |
205 | Lisp_Object n; | |
206 | XFASTINT (n) = mincol / tab_width - fromcol / tab_width; | |
207 | if (XFASTINT (n) != 0) | |
208 | { | |
209 | Finsert_char (make_number ('\t'), n); | |
210 | ||
211 | fromcol = (mincol / tab_width) * tab_width; | |
212 | } | |
213 | } | |
214 | ||
215 | XFASTINT (col) = mincol - fromcol; | |
216 | Finsert_char (make_number (' '), col); | |
217 | ||
218 | last_known_column = mincol; | |
219 | last_known_column_point = point; | |
220 | last_known_column_modified = MODIFF; | |
221 | ||
222 | XSETINT (col, mincol); | |
223 | return col; | |
224 | } | |
225 | \f | |
226 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, | |
227 | 0, 0, 0, | |
228 | "Return the indentation of the current line.\n\ | |
229 | This is the horizontal position of the character\n\ | |
230 | following any initial whitespace.") | |
231 | () | |
232 | { | |
233 | Lisp_Object val; | |
234 | ||
235 | XFASTINT (val) = position_indentation (find_next_newline (point, -1)); | |
236 | return val; | |
237 | } | |
238 | ||
239 | position_indentation (pos) | |
240 | register int pos; | |
241 | { | |
242 | register int column = 0; | |
243 | register int tab_width = XINT (current_buffer->tab_width); | |
244 | register unsigned char *p; | |
245 | register unsigned char *stop; | |
246 | ||
ccdcf1f5 | 247 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
248 | |
249 | stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1; | |
250 | p = &FETCH_CHAR (pos); | |
251 | while (1) | |
252 | { | |
253 | while (p == stop) | |
254 | { | |
255 | if (pos == ZV) | |
256 | return column; | |
257 | pos += p - &FETCH_CHAR (pos); | |
258 | p = &FETCH_CHAR (pos); | |
259 | stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1; | |
260 | } | |
261 | switch (*p++) | |
262 | { | |
263 | case ' ': | |
264 | column++; | |
265 | break; | |
266 | case '\t': | |
267 | column += tab_width - column % tab_width; | |
268 | break; | |
269 | default: | |
270 | return column; | |
271 | } | |
272 | } | |
273 | } | |
274 | \f | |
275 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, 0, | |
276 | "Move point to column COLUMN in the current line.\n\ | |
277 | The column of a character is calculated by adding together the widths\n\ | |
278 | as displayed of the previous characters in the line.\n\ | |
279 | This function ignores line-continuation;\n\ | |
280 | there is no upper limit on the column number a character can have\n\ | |
230a4cbd JB |
281 | and horizontal scrolling has no effect.\n\ |
282 | \n\ | |
993b6404 JB |
283 | If specified column is within a character, point goes after that character.\n\ |
284 | If it's past end of line, point goes to end of line.\n\n\ | |
285 | A non-nil second (optional) argument FORCE means, if the line\n\ | |
286 | is too short to reach column COLUMN then add spaces/tabs to get there,\n\ | |
287 | and if COLUMN is in the middle of a tab character, change it to spaces.") | |
288 | (column, force) | |
289 | Lisp_Object column, force; | |
290 | { | |
291 | register int pos; | |
292 | register int col = current_column (); | |
293 | register int goal; | |
294 | register int end; | |
295 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 296 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
993b6404 JB |
297 | register struct Lisp_Vector *dp = buffer_display_table (); |
298 | ||
299 | Lisp_Object val; | |
300 | int prev_col; | |
301 | int c; | |
302 | ||
ccdcf1f5 | 303 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
304 | CHECK_NATNUM (column, 0); |
305 | goal = XINT (column); | |
306 | ||
307 | retry: | |
308 | pos = point; | |
309 | end = ZV; | |
310 | ||
311 | /* If we're starting past the desired column, | |
312 | back up to beginning of line and scan from there. */ | |
313 | if (col > goal) | |
314 | { | |
315 | pos = find_next_newline (pos, -1); | |
316 | col = 0; | |
317 | } | |
318 | ||
319 | while (col < goal && pos < end) | |
320 | { | |
321 | c = FETCH_CHAR (pos); | |
322 | if (c == '\n') | |
323 | break; | |
324 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
325 | break; | |
326 | pos++; | |
327 | if (c == '\t') | |
328 | { | |
329 | prev_col = col; | |
330 | col += tab_width; | |
331 | col = col / tab_width * tab_width; | |
332 | } | |
dea4d2e6 RS |
333 | else if (dp != 0 && XTYPE (DISP_CHAR_VECTOR (dp, c)) == Lisp_Vector) |
334 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
993b6404 JB |
335 | else if (ctl_arrow && (c < 040 || c == 0177)) |
336 | col++; | |
337 | else if (c < 040 || c >= 0177) | |
338 | col += 3; | |
339 | else | |
340 | col++; | |
341 | } | |
342 | ||
343 | SET_PT (pos); | |
344 | ||
345 | /* If a tab char made us overshoot, change it to spaces | |
346 | and scan through it again. */ | |
56a98455 | 347 | if (!NILP (force) && col > goal && c == '\t' && prev_col < goal) |
993b6404 | 348 | { |
70ee42f7 JB |
349 | int old_point; |
350 | ||
993b6404 | 351 | del_range (point - 1, point); |
70ee42f7 JB |
352 | Findent_to (make_number (goal), Qnil); |
353 | old_point = point; | |
354 | Findent_to (make_number (col), Qnil); | |
355 | SET_PT (old_point); | |
5a05d3d2 RS |
356 | /* Set the last_known... vars consistently. */ |
357 | col = goal; | |
993b6404 JB |
358 | } |
359 | ||
360 | /* If line ends prematurely, add space to the end. */ | |
56a98455 | 361 | if (col < goal && !NILP (force)) |
230a4cbd | 362 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
363 | |
364 | last_known_column = col; | |
365 | last_known_column_point = point; | |
366 | last_known_column_modified = MODIFF; | |
367 | ||
368 | XFASTINT (val) = col; | |
369 | return val; | |
370 | } | |
371 | \f | |
372 | struct position val_compute_motion; | |
373 | ||
374 | /* Scan the current buffer forward from offset FROM, pretending that | |
375 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
376 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
377 | and return the ending buffer position and screen location. | |
378 | ||
379 | WIDTH is the number of columns available to display text; | |
380 | compute_motion uses this to handle continuation lines and such. | |
381 | HSCROLL is the number of columns not being displayed at the left | |
382 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
383 | TAB_OFFSET is the number of columns of the first tab that aren't |
384 | being displayed, perhaps because of a continuation line or | |
385 | something. | |
993b6404 JB |
386 | |
387 | compute_motion returns a pointer to a struct position. The bufpos | |
388 | member gives the buffer position at the end of the scan, and hpos | |
389 | and vpos give its cartesian location. I'm not clear on what the | |
390 | other members are. | |
391 | ||
392 | For example, to find the buffer position of column COL of line LINE | |
393 | of a certain window, pass the window's starting location as FROM | |
394 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
395 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
396 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
397 | TOHPOS. | |
398 | ||
399 | When displaying in window w, a typical formula for WIDTH is: | |
400 | ||
401 | window_width - 1 | |
a3c87d4e JB |
402 | - (has_vertical_scroll_bars |
403 | ? VERTICAL_SCROLL_BAR_WIDTH | |
fa61c701 | 404 | : (window_width + window_left != frame_width)) |
993b6404 JB |
405 | |
406 | where | |
407 | window_width is XFASTINT (w->width), | |
408 | window_left is XFASTINT (w->left), | |
a3c87d4e JB |
409 | has_vertical_scroll_bars is |
410 | FRAME_HAS_VERTICAL_SCROLL_BARS (XFRAME (WINDOW_FRAME (window))) | |
fa61c701 | 411 | and frame_width = FRAME_WIDTH (XFRAME (window->frame)) |
993b6404 | 412 | |
fa61c701 JB |
413 | Or, |
414 | window_internal_width (w) - 1 | |
415 | ||
416 | The `-1' accounts for the continuation-line backslashes; the rest | |
417 | accounts for window borders if the window is split vertically, and | |
a3c87d4e | 418 | the scroll bars if the frame supports them. */ |
993b6404 JB |
419 | |
420 | struct position * | |
421 | compute_motion (from, fromvpos, fromhpos, to, tovpos, tohpos, width, hscroll, tab_offset) | |
422 | int from, fromvpos, fromhpos, to, tovpos, tohpos; | |
423 | register int width; | |
424 | int hscroll, tab_offset; | |
425 | { | |
cde9337b JB |
426 | register int hpos = fromhpos; |
427 | register int vpos = fromvpos; | |
428 | ||
993b6404 JB |
429 | register int pos; |
430 | register int c; | |
431 | register int tab_width = XFASTINT (current_buffer->tab_width); | |
56a98455 | 432 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
993b6404 JB |
433 | register struct Lisp_Vector *dp = buffer_display_table (); |
434 | int selective | |
435 | = XTYPE (current_buffer->selective_display) == Lisp_Int | |
436 | ? XINT (current_buffer->selective_display) | |
56a98455 | 437 | : !NILP (current_buffer->selective_display) ? -1 : 0; |
cde9337b | 438 | int prev_vpos, prev_hpos; |
993b6404 | 439 | int selective_rlen |
dea4d2e6 RS |
440 | = (selective && dp && XTYPE (DISP_INVIS_VECTOR (dp)) == Lisp_Vector |
441 | ? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0); | |
5a05d3d2 RS |
442 | #ifdef USE_TEXT_PROPERTIES |
443 | /* The next location where the `invisible' property changes */ | |
444 | int next_invisible = from; | |
445 | Lisp_Object prop, position; | |
446 | #endif | |
993b6404 | 447 | |
ccdcf1f5 | 448 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
cde9337b | 449 | for (pos = from; pos < to; pos++) |
993b6404 | 450 | { |
cde9337b JB |
451 | /* Stop if past the target screen position. */ |
452 | if (vpos > tovpos | |
453 | || (vpos == tovpos && hpos >= tohpos)) | |
454 | break; | |
455 | ||
456 | prev_vpos = vpos; | |
457 | prev_hpos = hpos; | |
458 | ||
5a05d3d2 RS |
459 | #ifdef USE_TEXT_PROPERTIES |
460 | /* if the `invisible' property is set, we can skip to | |
461 | the next property change */ | |
462 | while (pos == next_invisible && pos < to) | |
463 | { | |
464 | XFASTINT (position) = pos; | |
465 | prop = Fget_text_property (position, | |
466 | Qinvisible, | |
467 | Fcurrent_buffer ()); | |
468 | { | |
469 | Lisp_Object end; | |
470 | ||
471 | end = Fnext_single_property_change (position, | |
472 | Qinvisible, | |
473 | Fcurrent_buffer ()); | |
474 | if (INTEGERP (end)) | |
475 | next_invisible = XINT (end); | |
476 | else | |
477 | next_invisible = to; | |
478 | if (! NILP (prop)) | |
479 | pos = next_invisible; | |
480 | } | |
481 | } | |
482 | if (pos >= to) | |
483 | break; | |
484 | #endif | |
993b6404 JB |
485 | c = FETCH_CHAR (pos); |
486 | if (c >= 040 && c < 0177 | |
dea4d2e6 | 487 | && (dp == 0 || XTYPE (DISP_CHAR_VECTOR (dp, c)) != Lisp_Vector)) |
cde9337b | 488 | hpos++; |
993b6404 JB |
489 | else if (c == '\t') |
490 | { | |
cde9337b JB |
491 | hpos += tab_width - ((hpos + tab_offset + hscroll - (hscroll > 0) |
492 | /* Add tab_width here to make sure positive. | |
493 | hpos can be negative after continuation | |
494 | but can't be less than -tab_width. */ | |
495 | + tab_width) | |
496 | % tab_width); | |
993b6404 JB |
497 | } |
498 | else if (c == '\n') | |
499 | { | |
500 | if (selective > 0 && position_indentation (pos + 1) >= selective) | |
501 | { | |
502 | /* Skip any number of invisible lines all at once */ | |
503 | do | |
504 | { | |
cde9337b | 505 | while (++pos < to && FETCH_CHAR (pos) != '\n'); |
993b6404 | 506 | } |
e51eab7c | 507 | while (pos < to && position_indentation (pos + 1) >= selective); |
993b6404 JB |
508 | pos--; |
509 | /* Allow for the " ..." that is displayed for them. */ | |
510 | if (selective_rlen) | |
511 | { | |
cde9337b JB |
512 | hpos += selective_rlen; |
513 | if (hpos >= width) | |
514 | hpos = width; | |
993b6404 | 515 | } |
e51eab7c | 516 | /* We have skipped the invis text, but not the newline after. */ |
993b6404 JB |
517 | } |
518 | else | |
cde9337b JB |
519 | { |
520 | /* A visible line. */ | |
521 | vpos++; | |
522 | hpos = 0; | |
46947372 JB |
523 | hpos -= hscroll; |
524 | if (hscroll > 0) hpos++; /* Count the ! on column 0 */ | |
525 | tab_offset = 0; | |
526 | } | |
993b6404 JB |
527 | } |
528 | else if (c == CR && selective < 0) | |
529 | { | |
530 | /* In selective display mode, | |
531 | everything from a ^M to the end of the line is invisible */ | |
cde9337b JB |
532 | while (pos < to && FETCH_CHAR (pos) != '\n') pos++; |
533 | /* Stop *before* the real newline. */ | |
993b6404 JB |
534 | pos--; |
535 | /* Allow for the " ..." that is displayed for them. */ | |
536 | if (selective_rlen) | |
537 | { | |
cde9337b JB |
538 | hpos += selective_rlen; |
539 | if (hpos >= width) | |
540 | hpos = width; | |
993b6404 JB |
541 | } |
542 | } | |
dea4d2e6 RS |
543 | else if (dp != 0 && XTYPE (DISP_CHAR_VECTOR (dp, c)) == Lisp_Vector) |
544 | hpos += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
993b6404 | 545 | else |
cde9337b | 546 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; |
993b6404 | 547 | |
cde9337b JB |
548 | /* Handle right margin. */ |
549 | if (hpos >= width | |
550 | && (hpos > width | |
551 | || (pos < ZV - 1 | |
993b6404 JB |
552 | && FETCH_CHAR (pos + 1) != '\n'))) |
553 | { | |
cde9337b JB |
554 | if (vpos > tovpos |
555 | || (vpos == tovpos && hpos >= tohpos)) | |
993b6404 JB |
556 | break; |
557 | if (hscroll | |
558 | || (truncate_partial_width_windows | |
502b9b64 | 559 | && width + 1 < FRAME_WIDTH (selected_frame)) |
56a98455 | 560 | || !NILP (current_buffer->truncate_lines)) |
993b6404 | 561 | { |
cde9337b JB |
562 | /* Truncating: skip to newline. */ |
563 | while (pos < to && FETCH_CHAR (pos) != '\n') pos++; | |
993b6404 | 564 | pos--; |
e51eab7c | 565 | hpos = width; |
993b6404 JB |
566 | } |
567 | else | |
568 | { | |
cde9337b JB |
569 | /* Continuing. */ |
570 | vpos++; | |
571 | hpos -= width; | |
993b6404 JB |
572 | tab_offset += width; |
573 | } | |
574 | ||
575 | } | |
576 | } | |
577 | ||
578 | val_compute_motion.bufpos = pos; | |
cde9337b JB |
579 | val_compute_motion.hpos = hpos; |
580 | val_compute_motion.vpos = vpos; | |
581 | val_compute_motion.prevhpos = prev_hpos; | |
993b6404 JB |
582 | |
583 | /* Nonzero if have just continued a line */ | |
584 | val_compute_motion.contin | |
cde9337b JB |
585 | = (pos != from |
586 | && (val_compute_motion.vpos != prev_vpos) | |
587 | && c != '\n'); | |
993b6404 JB |
588 | |
589 | return &val_compute_motion; | |
590 | } | |
993b6404 JB |
591 | |
592 | \f | |
593 | /* Return the column of position POS in window W's buffer, | |
594 | rounded down to a multiple of the internal width of W. | |
595 | This is the amount of indentation of position POS | |
596 | that is not visible in its horizontal position in the window. */ | |
597 | ||
598 | int | |
599 | pos_tab_offset (w, pos) | |
600 | struct window *w; | |
601 | register int pos; | |
602 | { | |
603 | int opoint = point; | |
604 | int col; | |
fa61c701 | 605 | int width = window_internal_width (w) - 1; |
993b6404 JB |
606 | |
607 | if (pos == BEGV || FETCH_CHAR (pos - 1) == '\n') | |
608 | return 0; | |
609 | SET_PT (pos); | |
610 | col = current_column (); | |
611 | SET_PT (opoint); | |
612 | return col - (col % width); | |
613 | } | |
614 | ||
615 | /* start_hpos is the hpos of the first character of the buffer: | |
616 | zero except for the minibuffer window, | |
617 | where it is the width of the prompt. */ | |
618 | ||
619 | struct position val_vmotion; | |
620 | ||
621 | struct position * | |
622 | vmotion (from, vtarget, width, hscroll, window) | |
623 | register int from, vtarget, width; | |
624 | int hscroll; | |
625 | Lisp_Object window; | |
626 | { | |
627 | struct position pos; | |
628 | /* vpos is cumulative vertical position, changed as from is changed */ | |
629 | register int vpos = 0; | |
630 | register int prevline; | |
631 | register int first; | |
632 | int lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
633 | int selective | |
634 | = XTYPE (current_buffer->selective_display) == Lisp_Int | |
635 | ? XINT (current_buffer->selective_display) | |
56a98455 | 636 | : !NILP (current_buffer->selective_display) ? -1 : 0; |
993b6404 JB |
637 | int start_hpos = (EQ (window, minibuf_window) ? minibuf_prompt_width : 0); |
638 | ||
639 | retry: | |
640 | if (vtarget > vpos) | |
641 | { | |
642 | /* Moving downward is simple, but must calculate from beg of line | |
643 | to determine hpos of starting point */ | |
644 | if (from > BEGV && FETCH_CHAR (from - 1) != '\n') | |
645 | { | |
646 | prevline = find_next_newline (from, -1); | |
5a05d3d2 RS |
647 | while (prevline > BEGV |
648 | && ((selective > 0 | |
649 | && position_indentation (prevline) >= selective) | |
650 | #ifdef USE_TEXT_PROPERTIES | |
651 | /* watch out for newlines with `invisible' property */ | |
652 | || ! NILP (Fget_text_property (XFASTINT (prevline), | |
653 | Qinvisible, | |
654 | Fcurrent_buffer ())) | |
655 | #endif | |
656 | )) | |
993b6404 JB |
657 | prevline = find_next_newline (prevline - 1, -1); |
658 | pos = *compute_motion (prevline, 0, | |
659 | lmargin + (prevline == 1 ? start_hpos : 0), | |
cde9337b | 660 | from, 1 << (INTBITS - 2), 0, |
993b6404 JB |
661 | width, hscroll, 0); |
662 | } | |
663 | else | |
664 | { | |
665 | pos.hpos = lmargin + (from == 1 ? start_hpos : 0); | |
666 | pos.vpos = 0; | |
667 | } | |
668 | return compute_motion (from, vpos, pos.hpos, | |
cde9337b | 669 | ZV, vtarget, - (1 << (INTBITS - 2)), |
993b6404 JB |
670 | width, hscroll, pos.vpos * width); |
671 | } | |
672 | ||
673 | /* To move upward, go a line at a time until | |
674 | we have gone at least far enough */ | |
675 | ||
676 | first = 1; | |
677 | ||
678 | while ((vpos > vtarget || first) && from > BEGV) | |
679 | { | |
680 | prevline = from; | |
681 | while (1) | |
682 | { | |
683 | prevline = find_next_newline (prevline - 1, -1); | |
684 | if (prevline == BEGV | |
5a05d3d2 RS |
685 | || ((selective <= 0 |
686 | || position_indentation (prevline) < selective) | |
687 | #ifdef USE_TEXT_PROPERTIES | |
688 | /* watch out for newlines with `invisible' property */ | |
689 | && NILP (Fget_text_property (XFASTINT (prevline), | |
690 | Qinvisible, | |
691 | Fcurrent_buffer ())) | |
692 | #endif | |
693 | )) | |
993b6404 JB |
694 | break; |
695 | } | |
696 | pos = *compute_motion (prevline, 0, | |
697 | lmargin + (prevline == 1 ? start_hpos : 0), | |
cde9337b | 698 | from, 1 << (INTBITS - 2), 0, |
993b6404 JB |
699 | width, hscroll, 0); |
700 | vpos -= pos.vpos; | |
701 | first = 0; | |
702 | from = prevline; | |
703 | } | |
704 | ||
705 | /* If we made exactly the desired vertical distance, | |
706 | or if we hit beginning of buffer, | |
707 | return point found */ | |
708 | if (vpos >= vtarget) | |
709 | { | |
710 | val_vmotion.bufpos = from; | |
711 | val_vmotion.vpos = vpos; | |
712 | val_vmotion.hpos = lmargin; | |
713 | val_vmotion.contin = 0; | |
714 | val_vmotion.prevhpos = 0; | |
715 | return &val_vmotion; | |
716 | } | |
717 | ||
718 | /* Otherwise find the correct spot by moving down */ | |
719 | goto retry; | |
720 | } | |
721 | ||
722 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 1, 0, | |
723 | "Move to start of screen line LINES lines down.\n\ | |
724 | If LINES is negative, this is moving up.\n\ | |
725 | Sets point to position found; this may be start of line\n\ | |
726 | or just the start of a continuation line.\n\ | |
727 | Returns number of lines moved; may be closer to zero than LINES\n\ | |
728 | if beginning or end of buffer was reached.") | |
729 | (lines) | |
730 | Lisp_Object lines; | |
731 | { | |
732 | struct position pos; | |
733 | register struct window *w = XWINDOW (selected_window); | |
fa61c701 | 734 | int width = window_internal_width (w) - 1; |
993b6404 JB |
735 | |
736 | CHECK_NUMBER (lines, 0); | |
737 | ||
738 | pos = *vmotion (point, XINT (lines), width, | |
739 | /* Not XFASTINT since perhaps could be negative */ | |
740 | XINT (w->hscroll), selected_window); | |
741 | ||
742 | SET_PT (pos.bufpos); | |
743 | return make_number (pos.vpos); | |
744 | } | |
745 | \f | |
746 | syms_of_indent () | |
747 | { | |
748 | DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode, | |
749 | "*Indentation can insert tabs if this is non-nil.\n\ | |
750 | Setting this variable automatically makes it local to the current buffer."); | |
751 | indent_tabs_mode = 1; | |
752 | ||
753 | defsubr (&Scurrent_indentation); | |
754 | defsubr (&Sindent_to); | |
755 | defsubr (&Scurrent_column); | |
756 | defsubr (&Smove_to_column); | |
757 | defsubr (&Svertical_motion); | |
758 | } |