Commit | Line | Data |
---|---|---|
993b6404 | 1 | /* Indentation functions. |
e01732fa | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994, 1995, 1998, 2000, 2001, |
4e6835db | 3 | 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
993b6404 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
684d6f5b | 9 | the Free Software Foundation; either version 3, or (at your option) |
993b6404 JB |
10 | any later version. |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
993b6404 | 21 | |
18160b98 | 22 | #include <config.h> |
4d553a13 KL |
23 | #include <stdio.h> |
24 | ||
993b6404 JB |
25 | #include "lisp.h" |
26 | #include "buffer.h" | |
a997a7ca | 27 | #include "charset.h" |
fb911777 | 28 | #include "category.h" |
993b6404 | 29 | #include "indent.h" |
2538fae4 | 30 | #include "keyboard.h" |
502b9b64 | 31 | #include "frame.h" |
993b6404 JB |
32 | #include "window.h" |
33 | #include "termchar.h" | |
34 | #include "termopts.h" | |
35 | #include "disptab.h" | |
5a05d3d2 | 36 | #include "intervals.h" |
0aa01123 | 37 | #include "region-cache.h" |
993b6404 JB |
38 | |
39 | /* Indentation can insert tabs if this is non-zero; | |
88c6e37e GM |
40 | otherwise always uses spaces. */ |
41 | ||
993b6404 JB |
42 | int indent_tabs_mode; |
43 | ||
993b6404 JB |
44 | #define CR 015 |
45 | ||
79c2a4fc | 46 | /* These three values memorize the current column to avoid recalculation. */ |
88c6e37e GM |
47 | |
48 | /* Last value returned by current_column. | |
49 | Some things in set last_known_column_point to -1 | |
79c2a4fc | 50 | to mark the memorized value as invalid. */ |
88c6e37e | 51 | |
76e20cb0 | 52 | double last_known_column; |
88c6e37e GM |
53 | |
54 | /* Value of point when current_column was called. */ | |
55 | ||
993b6404 | 56 | int last_known_column_point; |
88c6e37e GM |
57 | |
58 | /* Value of MODIFF when current_column was called. */ | |
59 | ||
993b6404 JB |
60 | int last_known_column_modified; |
61 | ||
76e20cb0 RS |
62 | static double current_column_1 P_ ((void)); |
63 | static double position_indentation P_ ((int)); | |
82d593eb | 64 | |
a997a7ca KH |
65 | /* Cache of beginning of line found by the last call of |
66 | current_column. */ | |
88c6e37e | 67 | |
a997a7ca KH |
68 | int current_column_bol_cache; |
69 | ||
993b6404 JB |
70 | /* Get the display table to use for the current buffer. */ |
71 | ||
d44f12b4 | 72 | struct Lisp_Char_Table * |
993b6404 JB |
73 | buffer_display_table () |
74 | { | |
75 | Lisp_Object thisbuf; | |
76 | ||
77 | thisbuf = current_buffer->display_table; | |
d44f12b4 RS |
78 | if (DISP_TABLE_P (thisbuf)) |
79 | return XCHAR_TABLE (thisbuf); | |
80 | if (DISP_TABLE_P (Vstandard_display_table)) | |
81 | return XCHAR_TABLE (Vstandard_display_table); | |
993b6404 JB |
82 | return 0; |
83 | } | |
84 | \f | |
0aa01123 JB |
85 | /* Width run cache considerations. */ |
86 | ||
87 | /* Return the width of character C under display table DP. */ | |
f845b8b2 | 88 | |
0aa01123 JB |
89 | static int |
90 | character_width (c, dp) | |
91 | int c; | |
d44f12b4 | 92 | struct Lisp_Char_Table *dp; |
0aa01123 JB |
93 | { |
94 | Lisp_Object elt; | |
95 | ||
96 | /* These width computations were determined by examining the cases | |
97 | in display_text_line. */ | |
98 | ||
f845b8b2 | 99 | /* Everything can be handled by the display table, if it's |
0aa01123 | 100 | present and the element is right. */ |
f845b8b2 | 101 | if (dp && (elt = DISP_CHAR_VECTOR (dp, c), VECTORP (elt))) |
0aa01123 JB |
102 | return XVECTOR (elt)->size; |
103 | ||
f845b8b2 RS |
104 | /* Some characters are special. */ |
105 | if (c == '\n' || c == '\t' || c == '\015') | |
106 | return 0; | |
107 | ||
108 | /* Printing characters have width 1. */ | |
0aa01123 JB |
109 | else if (c >= 040 && c < 0177) |
110 | return 1; | |
111 | ||
112 | /* Everybody else (control characters, metacharacters) has other | |
113 | widths. We could return their actual widths here, but they | |
114 | depend on things like ctl_arrow and crud like that, and they're | |
115 | not very common at all. So we'll just claim we don't know their | |
116 | widths. */ | |
117 | else | |
118 | return 0; | |
119 | } | |
120 | ||
e0f24100 | 121 | /* Return true if the display table DISPTAB specifies the same widths |
0aa01123 JB |
122 | for characters as WIDTHTAB. We use this to decide when to |
123 | invalidate the buffer's width_run_cache. */ | |
88c6e37e | 124 | |
0aa01123 JB |
125 | int |
126 | disptab_matches_widthtab (disptab, widthtab) | |
d44f12b4 | 127 | struct Lisp_Char_Table *disptab; |
0aa01123 JB |
128 | struct Lisp_Vector *widthtab; |
129 | { | |
130 | int i; | |
131 | ||
132 | if (widthtab->size != 256) | |
133 | abort (); | |
134 | ||
135 | for (i = 0; i < 256; i++) | |
136 | if (character_width (i, disptab) | |
137 | != XFASTINT (widthtab->contents[i])) | |
138 | return 0; | |
139 | ||
140 | return 1; | |
2ff4775b | 141 | } |
0aa01123 JB |
142 | |
143 | /* Recompute BUF's width table, using the display table DISPTAB. */ | |
88c6e37e | 144 | |
0aa01123 JB |
145 | void |
146 | recompute_width_table (buf, disptab) | |
147 | struct buffer *buf; | |
d44f12b4 | 148 | struct Lisp_Char_Table *disptab; |
0aa01123 JB |
149 | { |
150 | int i; | |
228a2e1a | 151 | struct Lisp_Vector *widthtab; |
0aa01123 | 152 | |
228a2e1a KH |
153 | if (!VECTORP (buf->width_table)) |
154 | buf->width_table = Fmake_vector (make_number (256), make_number (0)); | |
155 | widthtab = XVECTOR (buf->width_table); | |
0aa01123 JB |
156 | if (widthtab->size != 256) |
157 | abort (); | |
158 | ||
159 | for (i = 0; i < 256; i++) | |
228a2e1a | 160 | XSETFASTINT (widthtab->contents[i], character_width (i, disptab)); |
0aa01123 JB |
161 | } |
162 | ||
163 | /* Allocate or free the width run cache, as requested by the current | |
164 | state of current_buffer's cache_long_line_scans variable. */ | |
88c6e37e | 165 | |
0aa01123 JB |
166 | static void |
167 | width_run_cache_on_off () | |
168 | { | |
a997a7ca KH |
169 | if (NILP (current_buffer->cache_long_line_scans) |
170 | /* And, for the moment, this feature doesn't work on multibyte | |
171 | characters. */ | |
172 | || !NILP (current_buffer->enable_multibyte_characters)) | |
0aa01123 JB |
173 | { |
174 | /* It should be off. */ | |
175 | if (current_buffer->width_run_cache) | |
176 | { | |
177 | free_region_cache (current_buffer->width_run_cache); | |
178 | current_buffer->width_run_cache = 0; | |
179 | current_buffer->width_table = Qnil; | |
180 | } | |
181 | } | |
182 | else | |
183 | { | |
184 | /* It should be on. */ | |
185 | if (current_buffer->width_run_cache == 0) | |
2ff4775b | 186 | { |
0aa01123 | 187 | current_buffer->width_run_cache = new_region_cache (); |
0aa01123 JB |
188 | recompute_width_table (current_buffer, buffer_display_table ()); |
189 | } | |
190 | } | |
191 | } | |
192 | ||
193 | \f | |
9a21bb64 RS |
194 | /* Skip some invisible characters starting from POS. |
195 | This includes characters invisible because of text properties | |
196 | and characters invisible because of overlays. | |
197 | ||
198 | If position POS is followed by invisible characters, | |
199 | skip some of them and return the position after them. | |
200 | Otherwise return POS itself. | |
201 | ||
202 | Set *NEXT_BOUNDARY_P to the next position at which | |
203 | it will be necessary to call this function again. | |
204 | ||
205 | Don't scan past TO, and don't set *NEXT_BOUNDARY_P | |
206 | to a value greater than TO. | |
207 | ||
208 | If WINDOW is non-nil, and this buffer is displayed in WINDOW, | |
209 | take account of overlays that apply only in WINDOW. | |
210 | ||
211 | We don't necessarily skip all the invisible characters after POS | |
212 | because that could take a long time. We skip a reasonable number | |
213 | which can be skipped quickly. If there might be more invisible | |
214 | characters immediately following, then *NEXT_BOUNDARY_P | |
215 | will equal the return value. */ | |
216 | ||
8720a429 | 217 | int |
9a21bb64 RS |
218 | skip_invisible (pos, next_boundary_p, to, window) |
219 | int pos; | |
220 | int *next_boundary_p; | |
221 | int to; | |
222 | Lisp_Object window; | |
223 | { | |
2e34157c | 224 | Lisp_Object prop, position, overlay_limit, proplimit; |
2ca8b6c2 | 225 | Lisp_Object buffer, tmp; |
662152dd | 226 | int end, inv_p; |
9a21bb64 RS |
227 | |
228 | XSETFASTINT (position, pos); | |
229 | XSETBUFFER (buffer, current_buffer); | |
230 | ||
231 | /* Give faster response for overlay lookup near POS. */ | |
232 | recenter_overlay_lists (current_buffer, pos); | |
233 | ||
234 | /* We must not advance farther than the next overlay change. | |
235 | The overlay change might change the invisible property; | |
236 | or there might be overlay strings to be displayed there. */ | |
237 | overlay_limit = Fnext_overlay_change (position); | |
238 | /* As for text properties, this gives a lower bound | |
239 | for where the invisible text property could change. */ | |
240 | proplimit = Fnext_property_change (position, buffer, Qt); | |
241 | if (XFASTINT (overlay_limit) < XFASTINT (proplimit)) | |
242 | proplimit = overlay_limit; | |
243 | /* PROPLIMIT is now a lower bound for the next change | |
244 | in invisible status. If that is plenty far away, | |
245 | use that lower bound. */ | |
246 | if (XFASTINT (proplimit) > pos + 100 || XFASTINT (proplimit) >= to) | |
247 | *next_boundary_p = XFASTINT (proplimit); | |
248 | /* Otherwise, scan for the next `invisible' property change. */ | |
249 | else | |
250 | { | |
251 | /* Don't scan terribly far. */ | |
252 | XSETFASTINT (proplimit, min (pos + 100, to)); | |
253 | /* No matter what. don't go past next overlay change. */ | |
254 | if (XFASTINT (overlay_limit) < XFASTINT (proplimit)) | |
255 | proplimit = overlay_limit; | |
2ca8b6c2 SM |
256 | tmp = Fnext_single_property_change (position, Qinvisible, |
257 | buffer, proplimit); | |
258 | end = XFASTINT (tmp); | |
fe0066f5 | 259 | #if 0 |
a997a7ca KH |
260 | /* Don't put the boundary in the middle of multibyte form if |
261 | there is no actual property change. */ | |
262 | if (end == pos + 100 | |
263 | && !NILP (current_buffer->enable_multibyte_characters) | |
264 | && end < ZV) | |
265 | while (pos < end && !CHAR_HEAD_P (POS_ADDR (end))) | |
266 | end--; | |
fe0066f5 | 267 | #endif |
2e34157c | 268 | *next_boundary_p = end; |
9a21bb64 RS |
269 | } |
270 | /* if the `invisible' property is set, we can skip to | |
271 | the next property change */ | |
662152dd SM |
272 | prop = Fget_char_property (position, Qinvisible, |
273 | (!NILP (window) | |
274 | && EQ (XWINDOW (window)->buffer, buffer)) | |
275 | ? window : buffer); | |
276 | inv_p = TEXT_PROP_MEANS_INVISIBLE (prop); | |
277 | /* When counting columns (window == nil), don't skip over ellipsis text. */ | |
278 | if (NILP (window) ? inv_p == 1 : inv_p) | |
9a21bb64 RS |
279 | return *next_boundary_p; |
280 | return pos; | |
281 | } | |
282 | \f | |
012fd715 | 283 | /* If a composition starts at POS/POS_BYTE and it doesn't stride over |
703af3d5 | 284 | POINT, set *LEN / *LEN_BYTE to the character and byte lengths, *WIDTH |
012fd715 KH |
285 | to the width, and return 1. Otherwise, return 0. */ |
286 | ||
287 | static int | |
288 | check_composition (pos, pos_byte, point, len, len_byte, width) | |
289 | int pos, pos_byte, point; | |
290 | int *len, *len_byte, *width; | |
291 | { | |
292 | Lisp_Object prop; | |
293 | int start, end; | |
294 | int id; | |
295 | ||
296 | if (! find_composition (pos, -1, &start, &end, &prop, Qnil) | |
9ee6df62 KH |
297 | || pos != start || point < end |
298 | || !COMPOSITION_VALID_P (start, end, prop)) | |
012fd715 KH |
299 | return 0; |
300 | if ((id = get_composition_id (pos, pos_byte, end - pos, prop, Qnil)) < 0) | |
301 | return 0; | |
302 | ||
303 | *len = COMPOSITION_LENGTH (prop); | |
304 | *len_byte = CHAR_TO_BYTE (end) - pos_byte; | |
305 | *width = composition_table[id]->width; | |
306 | return 1; | |
307 | } | |
308 | \f | |
c9c0f7cf KH |
309 | /* Set variables WIDTH and BYTES for a multibyte sequence starting at P. |
310 | ||
c9c0f7cf KH |
311 | DP is a display table or NULL. |
312 | ||
313 | This macro is used in current_column_1, Fmove_to_column, and | |
314 | compute_motion. */ | |
315 | ||
012fd715 KH |
316 | #define MULTIBYTE_BYTES_WIDTH(p, dp) \ |
317 | do { \ | |
318 | int c; \ | |
319 | \ | |
320 | wide_column = 0; \ | |
321 | c = STRING_CHAR_AND_LENGTH (p, MAX_MULTIBYTE_LENGTH, bytes); \ | |
322 | if (BYTES_BY_CHAR_HEAD (*p) != bytes) \ | |
323 | width = bytes * 4; \ | |
324 | else \ | |
325 | { \ | |
326 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) \ | |
327 | width = XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; \ | |
328 | else \ | |
329 | width = WIDTH_BY_CHAR_HEAD (*p); \ | |
330 | if (width > 1) \ | |
331 | wide_column = width; \ | |
332 | } \ | |
c9c0f7cf KH |
333 | } while (0) |
334 | ||
097812fb | 335 | |
993b6404 | 336 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, |
8c1a1077 PJ |
337 | doc: /* Return the horizontal position of point. Beginning of line is column 0. |
338 | This is calculated by adding together the widths of all the displayed | |
339 | representations of the character between the start of the previous line | |
7bf120f1 JB |
340 | and point (eg. control characters will have a width of 2 or 4, tabs |
341 | will have a variable width). | |
8c1a1077 PJ |
342 | Ignores finite width of frame, which means that this function may return |
343 | values greater than (frame-width). | |
344 | Whether the line is visible (if `selective-display' is t) has no effect; | |
e01732fa SM |
345 | however, ^M is treated as end of line when `selective-display' is t. |
346 | Text that has an invisible property is considered as having width 0, unless | |
347 | `buffer-invisibility-spec' specifies that it is replaced by an ellipsis. */) | |
8c1a1077 | 348 | () |
993b6404 JB |
349 | { |
350 | Lisp_Object temp; | |
097812fb | 351 | XSETFASTINT (temp, (int) current_column ()); /* iftc */ |
993b6404 JB |
352 | return temp; |
353 | } | |
354 | ||
e74928fc JB |
355 | /* Cancel any recorded value of the horizontal position. */ |
356 | ||
c9667ae1 | 357 | void |
e74928fc JB |
358 | invalidate_current_column () |
359 | { | |
360 | last_known_column_point = 0; | |
361 | } | |
362 | ||
76e20cb0 | 363 | double |
993b6404 JB |
364 | current_column () |
365 | { | |
366 | register int col; | |
367 | register unsigned char *ptr, *stop; | |
368 | register int tab_seen; | |
369 | int post_tab; | |
370 | register int c; | |
371 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 372 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 373 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
993b6404 | 374 | |
6ec8bbd2 | 375 | if (PT == last_known_column_point |
993b6404 JB |
376 | && MODIFF == last_known_column_modified) |
377 | return last_known_column; | |
378 | ||
813b81b3 RS |
379 | /* If the buffer has overlays, text properties, |
380 | or multibyte characters, use a more general algorithm. */ | |
9a21bb64 | 381 | if (BUF_INTERVALS (current_buffer) |
3ea2f6f3 SM |
382 | || current_buffer->overlays_before |
383 | || current_buffer->overlays_after | |
813b81b3 RS |
384 | || Z != Z_BYTE) |
385 | return current_column_1 (); | |
9a21bb64 RS |
386 | |
387 | /* Scan backwards from point to the previous newline, | |
388 | counting width. Tab characters are the only complicated case. */ | |
389 | ||
993b6404 | 390 | /* Make a pointer for decrementing through the chars before point. */ |
fe0066f5 | 391 | ptr = BYTE_POS_ADDR (PT_BYTE - 1) + 1; |
993b6404 JB |
392 | /* Make a pointer to where consecutive chars leave off, |
393 | going backwards from point. */ | |
6ec8bbd2 | 394 | if (PT == BEGV) |
993b6404 | 395 | stop = ptr; |
6ec8bbd2 | 396 | else if (PT <= GPT || BEGV > GPT) |
993b6404 JB |
397 | stop = BEGV_ADDR; |
398 | else | |
399 | stop = GAP_END_ADDR; | |
400 | ||
88c6e37e GM |
401 | if (tab_width <= 0 || tab_width > 1000) |
402 | tab_width = 8; | |
993b6404 JB |
403 | |
404 | col = 0, tab_seen = 0, post_tab = 0; | |
405 | ||
406 | while (1) | |
407 | { | |
88c6e37e GM |
408 | EMACS_INT i, n; |
409 | Lisp_Object charvec; | |
097812fb | 410 | |
993b6404 JB |
411 | if (ptr == stop) |
412 | { | |
413 | /* We stopped either for the beginning of the buffer | |
414 | or for the gap. */ | |
415 | if (ptr == BEGV_ADDR) | |
416 | break; | |
097812fb | 417 | |
993b6404 JB |
418 | /* It was the gap. Jump back over it. */ |
419 | stop = BEGV_ADDR; | |
420 | ptr = GPT_ADDR; | |
097812fb | 421 | |
993b6404 | 422 | /* Check whether that brings us to beginning of buffer. */ |
88c6e37e GM |
423 | if (BEGV >= GPT) |
424 | break; | |
993b6404 JB |
425 | } |
426 | ||
427 | c = *--ptr; | |
097812fb | 428 | |
88c6e37e | 429 | if (dp && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
7050d530 | 430 | { |
88c6e37e GM |
431 | charvec = DISP_CHAR_VECTOR (dp, c); |
432 | n = ASIZE (charvec); | |
7050d530 | 433 | } |
88c6e37e | 434 | else |
993b6404 | 435 | { |
88c6e37e GM |
436 | charvec = Qnil; |
437 | n = 1; | |
438 | } | |
097812fb | 439 | |
88c6e37e GM |
440 | for (i = n - 1; i >= 0; --i) |
441 | { | |
442 | if (VECTORP (charvec)) | |
443 | { | |
444 | /* This should be handled the same as | |
445 | next_element_from_display_vector does it. */ | |
446 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 447 | |
88c6e37e GM |
448 | if (INTEGERP (entry) |
449 | && GLYPH_CHAR_VALID_P (XFASTINT (entry))) | |
450 | c = FAST_GLYPH_CHAR (XFASTINT (entry)); | |
451 | else | |
452 | c = ' '; | |
453 | } | |
097812fb | 454 | |
88c6e37e GM |
455 | if (c >= 040 && c < 0177) |
456 | col++; | |
457 | else if (c == '\n' | |
458 | || (c == '\r' | |
459 | && EQ (current_buffer->selective_display, Qt))) | |
460 | { | |
461 | ptr++; | |
462 | goto start_of_line_found; | |
463 | } | |
464 | else if (c == '\t') | |
465 | { | |
466 | if (tab_seen) | |
467 | col = ((col + tab_width) / tab_width) * tab_width; | |
097812fb | 468 | |
88c6e37e GM |
469 | post_tab += col; |
470 | col = 0; | |
471 | tab_seen = 1; | |
472 | } | |
f1004faf GM |
473 | else if (VECTORP (charvec)) |
474 | /* With a display table entry, C is displayed as is, and | |
475 | not displayed as \NNN or as ^N. If C is a single-byte | |
476 | character, it takes one column. If C is multi-byte in | |
477 | an unibyte buffer, it's translated to unibyte, so it | |
478 | also takes one column. */ | |
479 | ++col; | |
88c6e37e GM |
480 | else |
481 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
993b6404 | 482 | } |
993b6404 JB |
483 | } |
484 | ||
88c6e37e GM |
485 | start_of_line_found: |
486 | ||
993b6404 JB |
487 | if (tab_seen) |
488 | { | |
489 | col = ((col + tab_width) / tab_width) * tab_width; | |
490 | col += post_tab; | |
491 | } | |
492 | ||
a997a7ca KH |
493 | if (ptr == BEGV_ADDR) |
494 | current_column_bol_cache = BEGV; | |
495 | else | |
fe0066f5 RS |
496 | current_column_bol_cache = BYTE_TO_CHAR (PTR_BYTE_POS (ptr)); |
497 | ||
993b6404 | 498 | last_known_column = col; |
6ec8bbd2 | 499 | last_known_column_point = PT; |
993b6404 JB |
500 | last_known_column_modified = MODIFF; |
501 | ||
502 | return col; | |
503 | } | |
504 | \f | |
9a21bb64 RS |
505 | /* Return the column number of position POS |
506 | by scanning forward from the beginning of the line. | |
507 | This function handles characters that are invisible | |
508 | due to text properties or overlays. */ | |
509 | ||
76e20cb0 | 510 | static double |
813b81b3 | 511 | current_column_1 () |
9a21bb64 RS |
512 | { |
513 | register int tab_width = XINT (current_buffer->tab_width); | |
514 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); | |
515 | register struct Lisp_Char_Table *dp = buffer_display_table (); | |
fe0066f5 | 516 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
9a21bb64 RS |
517 | |
518 | /* Start the scan at the beginning of this line with column number 0. */ | |
519 | register int col = 0; | |
fe0066f5 | 520 | int scan, scan_byte; |
58b1103e | 521 | int next_boundary; |
fe0066f5 RS |
522 | int opoint = PT, opoint_byte = PT_BYTE; |
523 | ||
813b81b3 | 524 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); |
fe0066f5 RS |
525 | current_column_bol_cache = PT; |
526 | scan = PT, scan_byte = PT_BYTE; | |
527 | SET_PT_BOTH (opoint, opoint_byte); | |
528 | next_boundary = scan; | |
9a21bb64 RS |
529 | |
530 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
531 | ||
532 | /* Scan forward to the target position. */ | |
813b81b3 | 533 | while (scan < opoint) |
9a21bb64 RS |
534 | { |
535 | int c; | |
536 | ||
537 | /* Occasionally we may need to skip invisible text. */ | |
538 | while (scan == next_boundary) | |
539 | { | |
fe0066f5 | 540 | int old_scan = scan; |
9a21bb64 RS |
541 | /* This updates NEXT_BOUNDARY to the next place |
542 | where we might need to skip more invisible text. */ | |
813b81b3 RS |
543 | scan = skip_invisible (scan, &next_boundary, opoint, Qnil); |
544 | if (scan >= opoint) | |
9a21bb64 | 545 | goto endloop; |
fe0066f5 RS |
546 | if (scan != old_scan) |
547 | scan_byte = CHAR_TO_BYTE (scan); | |
9a21bb64 RS |
548 | } |
549 | ||
012fd715 KH |
550 | /* Check composition sequence. */ |
551 | { | |
552 | int len, len_byte, width; | |
553 | ||
554 | if (check_composition (scan, scan_byte, opoint, | |
555 | &len, &len_byte, &width)) | |
556 | { | |
557 | scan += len; | |
558 | scan_byte += len_byte; | |
559 | if (scan <= opoint) | |
560 | col += width; | |
561 | continue; | |
562 | } | |
563 | } | |
564 | ||
813b81b3 | 565 | c = FETCH_BYTE (scan_byte); |
88c6e37e | 566 | |
c9c0f7cf KH |
567 | if (dp != 0 |
568 | && ! (multibyte && BASE_LEADING_CODE_P (c)) | |
569 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
9a21bb64 | 570 | { |
d6e483a4 RS |
571 | Lisp_Object charvec; |
572 | EMACS_INT i, n; | |
573 | ||
574 | /* This character is displayed using a vector of glyphs. | |
575 | Update the column based on those glyphs. */ | |
576 | ||
88c6e37e GM |
577 | charvec = DISP_CHAR_VECTOR (dp, c); |
578 | n = ASIZE (charvec); | |
88c6e37e | 579 | |
d6e483a4 | 580 | for (i = 0; i < n; i++) |
88c6e37e GM |
581 | { |
582 | /* This should be handled the same as | |
583 | next_element_from_display_vector does it. */ | |
d6e483a4 RS |
584 | Lisp_Object entry; |
585 | entry = AREF (charvec, i); | |
586 | ||
88c6e37e GM |
587 | if (INTEGERP (entry) |
588 | && GLYPH_CHAR_VALID_P (XFASTINT (entry))) | |
589 | c = FAST_GLYPH_CHAR (XFASTINT (entry)); | |
590 | else | |
591 | c = ' '; | |
d6e483a4 RS |
592 | |
593 | if (c == '\n') | |
594 | goto endloop; | |
595 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
596 | goto endloop; | |
597 | if (c == '\t') | |
598 | { | |
d6e483a4 RS |
599 | col += tab_width; |
600 | col = col / tab_width * tab_width; | |
601 | } | |
602 | else | |
603 | ++col; | |
88c6e37e | 604 | } |
d6e483a4 RS |
605 | } |
606 | else | |
607 | { | |
608 | /* The display table says nothing for this character. | |
609 | Display it as itself. */ | |
610 | ||
88c6e37e GM |
611 | if (c == '\n') |
612 | goto endloop; | |
613 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
614 | goto endloop; | |
88c6e37e GM |
615 | if (c == '\t') |
616 | { | |
88c6e37e GM |
617 | col += tab_width; |
618 | col = col / tab_width * tab_width; | |
619 | } | |
620 | else if (multibyte && BASE_LEADING_CODE_P (c)) | |
621 | { | |
622 | unsigned char *ptr; | |
623 | int bytes, width, wide_column; | |
097812fb | 624 | |
88c6e37e GM |
625 | ptr = BYTE_POS_ADDR (scan_byte); |
626 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
627 | scan_byte += bytes; | |
36974b5e RS |
628 | /* Subtract one to compensate for the increment |
629 | that is going to happen below. */ | |
630 | scan_byte--; | |
88c6e37e GM |
631 | col += width; |
632 | } | |
633 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
634 | col += 2; | |
635 | else if (c < 040 || c >= 0177) | |
636 | col += 4; | |
637 | else | |
638 | col++; | |
a997a7ca | 639 | } |
d6e483a4 RS |
640 | scan++; |
641 | scan_byte++; | |
642 | ||
9a21bb64 RS |
643 | } |
644 | endloop: | |
645 | ||
646 | last_known_column = col; | |
6ec8bbd2 | 647 | last_known_column_point = PT; |
9a21bb64 RS |
648 | last_known_column_modified = MODIFF; |
649 | ||
650 | return col; | |
651 | } | |
652 | \f | |
f4a6687d GM |
653 | |
654 | #if 0 /* Not used. */ | |
655 | ||
c412c808 RS |
656 | /* Return the width in columns of the part of STRING from BEG to END. |
657 | If BEG is nil, that stands for the beginning of STRING. | |
658 | If END is nil, that stands for the end of STRING. */ | |
659 | ||
76e20cb0 | 660 | static double |
382ac0bd | 661 | string_display_width (string, beg, end) |
c412c808 RS |
662 | Lisp_Object string, beg, end; |
663 | { | |
664 | register int col; | |
665 | register unsigned char *ptr, *stop; | |
666 | register int tab_seen; | |
667 | int post_tab; | |
668 | register int c; | |
669 | register int tab_width = XINT (current_buffer->tab_width); | |
670 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); | |
d44f12b4 | 671 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
c412c808 RS |
672 | int b, e; |
673 | ||
674 | if (NILP (end)) | |
d5db4077 | 675 | e = SCHARS (string); |
c412c808 RS |
676 | else |
677 | { | |
b7826503 | 678 | CHECK_NUMBER (end); |
c412c808 RS |
679 | e = XINT (end); |
680 | } | |
681 | ||
682 | if (NILP (beg)) | |
683 | b = 0; | |
684 | else | |
685 | { | |
b7826503 | 686 | CHECK_NUMBER (beg); |
c412c808 RS |
687 | b = XINT (beg); |
688 | } | |
689 | ||
690 | /* Make a pointer for decrementing through the chars before point. */ | |
d5db4077 | 691 | ptr = SDATA (string) + e; |
c412c808 RS |
692 | /* Make a pointer to where consecutive chars leave off, |
693 | going backwards from point. */ | |
d5db4077 | 694 | stop = SDATA (string) + b; |
c412c808 RS |
695 | |
696 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
697 | ||
698 | col = 0, tab_seen = 0, post_tab = 0; | |
699 | ||
700 | while (1) | |
701 | { | |
702 | if (ptr == stop) | |
703 | break; | |
704 | ||
705 | c = *--ptr; | |
706 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
707 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
708 | else if (c >= 040 && c < 0177) | |
709 | col++; | |
710 | else if (c == '\n') | |
711 | break; | |
712 | else if (c == '\t') | |
713 | { | |
714 | if (tab_seen) | |
715 | col = ((col + tab_width) / tab_width) * tab_width; | |
716 | ||
717 | post_tab += col; | |
718 | col = 0; | |
719 | tab_seen = 1; | |
720 | } | |
721 | else | |
722 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
723 | } | |
724 | ||
725 | if (tab_seen) | |
726 | { | |
727 | col = ((col + tab_width) / tab_width) * tab_width; | |
728 | col += post_tab; | |
729 | } | |
730 | ||
731 | return col; | |
732 | } | |
f4a6687d GM |
733 | |
734 | #endif /* 0 */ | |
735 | ||
c412c808 | 736 | \f |
993b6404 | 737 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
8c1a1077 | 738 | doc: /* Indent from point with tabs and spaces until COLUMN is reached. |
7bf120f1 | 739 | Optional second argument MINIMUM says always do at least MINIMUM spaces |
f64f035e EZ |
740 | even if that goes past COLUMN; by default, MINIMUM is zero. |
741 | ||
742 | The return value is COLUMN. */) | |
8c1a1077 | 743 | (column, minimum) |
04c98432 | 744 | Lisp_Object column, minimum; |
993b6404 JB |
745 | { |
746 | int mincol; | |
747 | register int fromcol; | |
748 | register int tab_width = XINT (current_buffer->tab_width); | |
749 | ||
b7826503 | 750 | CHECK_NUMBER (column); |
56a98455 | 751 | if (NILP (minimum)) |
94d92e9c | 752 | XSETFASTINT (minimum, 0); |
b7826503 | 753 | CHECK_NUMBER (minimum); |
993b6404 JB |
754 | |
755 | fromcol = current_column (); | |
756 | mincol = fromcol + XINT (minimum); | |
04c98432 | 757 | if (mincol < XINT (column)) mincol = XINT (column); |
993b6404 JB |
758 | |
759 | if (fromcol == mincol) | |
760 | return make_number (mincol); | |
761 | ||
ccdcf1f5 | 762 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
763 | |
764 | if (indent_tabs_mode) | |
765 | { | |
766 | Lisp_Object n; | |
94d92e9c | 767 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
768 | if (XFASTINT (n) != 0) |
769 | { | |
6d1bd1a5 | 770 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
771 | |
772 | fromcol = (mincol / tab_width) * tab_width; | |
773 | } | |
774 | } | |
775 | ||
04c98432 EN |
776 | XSETFASTINT (column, mincol - fromcol); |
777 | Finsert_char (make_number (' '), column, Qt); | |
993b6404 JB |
778 | |
779 | last_known_column = mincol; | |
6ec8bbd2 | 780 | last_known_column_point = PT; |
993b6404 JB |
781 | last_known_column_modified = MODIFF; |
782 | ||
04c98432 EN |
783 | XSETINT (column, mincol); |
784 | return column; | |
993b6404 | 785 | } |
0aa01123 | 786 | |
993b6404 | 787 | \f |
76e20cb0 | 788 | static double position_indentation P_ ((int)); |
dfcf069d | 789 | |
993b6404 | 790 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, |
8c1a1077 PJ |
791 | 0, 0, 0, |
792 | doc: /* Return the indentation of the current line. | |
793 | This is the horizontal position of the character | |
794 | following any initial whitespace. */) | |
795 | () | |
993b6404 JB |
796 | { |
797 | Lisp_Object val; | |
fe0066f5 RS |
798 | int opoint = PT, opoint_byte = PT_BYTE; |
799 | ||
800 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); | |
993b6404 | 801 | |
097812fb | 802 | XSETFASTINT (val, (int) position_indentation (PT_BYTE)); /* iftc */ |
fe0066f5 | 803 | SET_PT_BOTH (opoint, opoint_byte); |
993b6404 JB |
804 | return val; |
805 | } | |
806 | ||
76e20cb0 | 807 | static double |
fe0066f5 RS |
808 | position_indentation (pos_byte) |
809 | register int pos_byte; | |
993b6404 JB |
810 | { |
811 | register int column = 0; | |
812 | register int tab_width = XINT (current_buffer->tab_width); | |
813 | register unsigned char *p; | |
814 | register unsigned char *stop; | |
9a21bb64 | 815 | unsigned char *start; |
fe0066f5 RS |
816 | int next_boundary_byte = pos_byte; |
817 | int ceiling = next_boundary_byte; | |
2ff4775b | 818 | |
ccdcf1f5 | 819 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
2ff4775b | 820 | |
fe0066f5 | 821 | p = BYTE_POS_ADDR (pos_byte); |
9a21bb64 RS |
822 | /* STOP records the value of P at which we will need |
823 | to think about the gap, or about invisible text, | |
824 | or about the end of the buffer. */ | |
825 | stop = p; | |
826 | /* START records the starting value of P. */ | |
827 | start = p; | |
993b6404 JB |
828 | while (1) |
829 | { | |
830 | while (p == stop) | |
831 | { | |
fe0066f5 | 832 | int stop_pos_byte; |
9a21bb64 | 833 | |
fe0066f5 RS |
834 | /* If we have updated P, set POS_BYTE to match. |
835 | The first time we enter the loop, POS_BYTE is already right. */ | |
9a21bb64 | 836 | if (p != start) |
fe0066f5 | 837 | pos_byte = PTR_BYTE_POS (p); |
9a21bb64 | 838 | /* Consider the various reasons STOP might have been set here. */ |
fe0066f5 | 839 | if (pos_byte == ZV_BYTE) |
993b6404 | 840 | return column; |
fe0066f5 RS |
841 | if (pos_byte == next_boundary_byte) |
842 | { | |
843 | int next_boundary; | |
844 | int pos = BYTE_TO_CHAR (pos_byte); | |
845 | pos = skip_invisible (pos, &next_boundary, ZV, Qnil); | |
846 | pos_byte = CHAR_TO_BYTE (pos); | |
847 | next_boundary_byte = CHAR_TO_BYTE (next_boundary); | |
848 | } | |
849 | if (pos_byte >= ceiling) | |
850 | ceiling = BUFFER_CEILING_OF (pos_byte) + 1; | |
9a21bb64 RS |
851 | /* Compute the next place we need to stop and think, |
852 | and set STOP accordingly. */ | |
fe0066f5 | 853 | stop_pos_byte = min (ceiling, next_boundary_byte); |
9a21bb64 | 854 | /* The -1 and +1 arrange to point at the first byte of gap |
fe0066f5 | 855 | (if STOP_POS_BYTE is the position of the gap) |
9a21bb64 | 856 | rather than at the data after the gap. */ |
097812fb | 857 | |
fe0066f5 RS |
858 | stop = BYTE_POS_ADDR (stop_pos_byte - 1) + 1; |
859 | p = BYTE_POS_ADDR (pos_byte); | |
993b6404 JB |
860 | } |
861 | switch (*p++) | |
862 | { | |
fb911777 KH |
863 | case 0240: |
864 | if (! NILP (current_buffer->enable_multibyte_characters)) | |
865 | return column; | |
993b6404 JB |
866 | case ' ': |
867 | column++; | |
868 | break; | |
869 | case '\t': | |
870 | column += tab_width - column % tab_width; | |
871 | break; | |
872 | default: | |
fb911777 KH |
873 | if (ASCII_BYTE_P (p[-1]) |
874 | || NILP (current_buffer->enable_multibyte_characters)) | |
875 | return column; | |
876 | { | |
fe0066f5 RS |
877 | int c; |
878 | pos_byte = PTR_BYTE_POS (p - 1); | |
879 | c = FETCH_MULTIBYTE_CHAR (pos_byte); | |
fb911777 KH |
880 | if (CHAR_HAS_CATEGORY (c, ' ')) |
881 | { | |
882 | column++; | |
fe0066f5 RS |
883 | INC_POS (pos_byte); |
884 | p = BYTE_POS_ADDR (pos_byte); | |
fb911777 KH |
885 | } |
886 | else | |
887 | return column; | |
888 | } | |
993b6404 JB |
889 | } |
890 | } | |
891 | } | |
1b15e576 KH |
892 | |
893 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
894 | Blank lines are treated as if they had the same indentation as the | |
895 | preceding line. */ | |
fe0066f5 | 896 | |
1b15e576 | 897 | int |
fe0066f5 | 898 | indented_beyond_p (pos, pos_byte, column) |
097812fb | 899 | int pos, pos_byte; |
76e20cb0 | 900 | double column; |
1b15e576 | 901 | { |
76e20cb0 | 902 | double val; |
fe0066f5 RS |
903 | int opoint = PT, opoint_byte = PT_BYTE; |
904 | ||
905 | SET_PT_BOTH (pos, pos_byte); | |
906 | while (PT > BEGV && FETCH_BYTE (PT_BYTE) == '\n') | |
907 | scan_newline (PT - 1, PT_BYTE - 1, BEGV, BEGV_BYTE, -1, 0); | |
908 | ||
d5d6f706 | 909 | val = position_indentation (PT_BYTE); |
fe0066f5 | 910 | SET_PT_BOTH (opoint, opoint_byte); |
097812fb | 911 | return val >= column; /* hmm, float comparison */ |
1b15e576 | 912 | } |
993b6404 | 913 | \f |
782d260e | 914 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, "p", |
8c1a1077 | 915 | doc: /* Move point to column COLUMN in the current line. |
3c860543 | 916 | Interactively, COLUMN is the value of prefix numeric argument. |
8c1a1077 PJ |
917 | The column of a character is calculated by adding together the widths |
918 | as displayed of the previous characters in the line. | |
919 | This function ignores line-continuation; | |
920 | there is no upper limit on the column number a character can have | |
921 | and horizontal scrolling has no effect. | |
922 | ||
923 | If specified column is within a character, point goes after that character. | |
924 | If it's past end of line, point goes to end of line. | |
925 | ||
3c860543 EZ |
926 | Optional second argument FORCE non-nil means if COLUMN is in the |
927 | middle of a tab character, change it to spaces. | |
928 | In addition, if FORCE is t, and the line is too short to reach | |
929 | COLUMN, add spaces/tabs to get there. | |
8c1a1077 PJ |
930 | |
931 | The return value is the current column. */) | |
932 | (column, force) | |
993b6404 JB |
933 | Lisp_Object column, force; |
934 | { | |
bdf5f8ef SM |
935 | register EMACS_INT pos; |
936 | register EMACS_INT col = current_column (); | |
937 | register EMACS_INT goal; | |
938 | register EMACS_INT end; | |
993b6404 | 939 | register int tab_width = XINT (current_buffer->tab_width); |
56a98455 | 940 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 941 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
a997a7ca | 942 | register int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
993b6404 JB |
943 | |
944 | Lisp_Object val; | |
bdf5f8ef | 945 | EMACS_INT prev_col = 0; |
6bbd7a29 | 946 | int c = 0; |
bdf5f8ef | 947 | EMACS_INT next_boundary, pos_byte; |
fe0066f5 | 948 | |
ccdcf1f5 | 949 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
b7826503 | 950 | CHECK_NATNUM (column); |
993b6404 JB |
951 | goal = XINT (column); |
952 | ||
6ec8bbd2 | 953 | pos = PT; |
fe0066f5 | 954 | pos_byte = PT_BYTE; |
993b6404 JB |
955 | end = ZV; |
956 | ||
957 | /* If we're starting past the desired column, | |
958 | back up to beginning of line and scan from there. */ | |
959 | if (col > goal) | |
960 | { | |
9a21bb64 | 961 | end = pos; |
a997a7ca | 962 | pos = current_column_bol_cache; |
fe0066f5 | 963 | pos_byte = CHAR_TO_BYTE (pos); |
993b6404 JB |
964 | col = 0; |
965 | } | |
966 | ||
4c669c09 RS |
967 | next_boundary = pos; |
968 | ||
8861f16f | 969 | while (pos < end) |
993b6404 | 970 | { |
9a21bb64 RS |
971 | while (pos == next_boundary) |
972 | { | |
bdf5f8ef | 973 | EMACS_INT prev = pos; |
9a21bb64 | 974 | pos = skip_invisible (pos, &next_boundary, end, Qnil); |
fe0066f5 RS |
975 | if (pos != prev) |
976 | pos_byte = CHAR_TO_BYTE (pos); | |
9a21bb64 RS |
977 | if (pos >= end) |
978 | goto endloop; | |
979 | } | |
980 | ||
8861f16f RS |
981 | /* Test reaching the goal column. We do this after skipping |
982 | invisible characters, so that we put point before the | |
983 | character on which the cursor will appear. */ | |
984 | if (col >= goal) | |
985 | break; | |
986 | ||
012fd715 KH |
987 | /* Check composition sequence. */ |
988 | { | |
989 | int len, len_byte, width; | |
990 | ||
991 | if (check_composition (pos, pos_byte, Z, &len, &len_byte, &width)) | |
992 | { | |
993 | pos += len; | |
994 | pos_byte += len_byte; | |
995 | col += width; | |
996 | continue; | |
997 | } | |
998 | } | |
999 | ||
fe0066f5 | 1000 | c = FETCH_BYTE (pos_byte); |
88c6e37e | 1001 | |
d6e483a4 RS |
1002 | /* See if there is a display table and it relates |
1003 | to this character. */ | |
1004 | ||
c9c0f7cf KH |
1005 | if (dp != 0 |
1006 | && ! (multibyte && BASE_LEADING_CODE_P (c)) | |
1007 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
f845b8b2 | 1008 | { |
d6e483a4 RS |
1009 | Lisp_Object charvec; |
1010 | EMACS_INT i, n; | |
1011 | ||
1012 | /* This character is displayed using a vector of glyphs. | |
1013 | Update the position based on those glyphs. */ | |
1014 | ||
88c6e37e GM |
1015 | charvec = DISP_CHAR_VECTOR (dp, c); |
1016 | n = ASIZE (charvec); | |
88c6e37e | 1017 | |
d6e483a4 | 1018 | for (i = 0; i < n; i++) |
88c6e37e GM |
1019 | { |
1020 | /* This should be handled the same as | |
1021 | next_element_from_display_vector does it. */ | |
d6e483a4 RS |
1022 | |
1023 | Lisp_Object entry; | |
1024 | entry = AREF (charvec, i); | |
1025 | ||
88c6e37e GM |
1026 | if (INTEGERP (entry) |
1027 | && GLYPH_CHAR_VALID_P (XFASTINT (entry))) | |
1028 | c = FAST_GLYPH_CHAR (XFASTINT (entry)); | |
1029 | else | |
1030 | c = ' '; | |
d6e483a4 RS |
1031 | |
1032 | if (c == '\n') | |
1033 | goto endloop; | |
1034 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
1035 | goto endloop; | |
1036 | if (c == '\t') | |
1037 | { | |
1038 | prev_col = col; | |
1039 | col += tab_width; | |
1040 | col = col / tab_width * tab_width; | |
1041 | } | |
1042 | else | |
1043 | ++col; | |
88c6e37e | 1044 | } |
d6e483a4 RS |
1045 | } |
1046 | else | |
1047 | { | |
1048 | /* The display table doesn't affect this character; | |
1049 | it displays as itself. */ | |
88c6e37e | 1050 | |
88c6e37e GM |
1051 | if (c == '\n') |
1052 | goto endloop; | |
1053 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
1054 | goto endloop; | |
88c6e37e GM |
1055 | if (c == '\t') |
1056 | { | |
1057 | prev_col = col; | |
1058 | col += tab_width; | |
1059 | col = col / tab_width * tab_width; | |
1060 | } | |
1061 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
1062 | col += 2; | |
1063 | else if (c < 040 || c == 0177) | |
1064 | col += 4; | |
1065 | else if (c < 0177) | |
1066 | col++; | |
1067 | else if (multibyte && BASE_LEADING_CODE_P (c)) | |
1068 | { | |
1069 | /* Start of multi-byte form. */ | |
1070 | unsigned char *ptr; | |
1071 | int bytes, width, wide_column; | |
1072 | ||
88c6e37e GM |
1073 | ptr = BYTE_POS_ADDR (pos_byte); |
1074 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
d6e483a4 | 1075 | pos_byte += bytes - 1; |
88c6e37e GM |
1076 | col += width; |
1077 | } | |
1078 | else | |
1079 | col += 4; | |
a997a7ca | 1080 | } |
d6e483a4 RS |
1081 | |
1082 | pos++; | |
1083 | pos_byte++; | |
993b6404 | 1084 | } |
9a21bb64 | 1085 | endloop: |
993b6404 | 1086 | |
fe0066f5 | 1087 | SET_PT_BOTH (pos, pos_byte); |
993b6404 JB |
1088 | |
1089 | /* If a tab char made us overshoot, change it to spaces | |
1090 | and scan through it again. */ | |
56a98455 | 1091 | if (!NILP (force) && col > goal && c == '\t' && prev_col < goal) |
993b6404 | 1092 | { |
bdf5f8ef | 1093 | EMACS_INT goal_pt, goal_pt_byte; |
154a424a GM |
1094 | |
1095 | /* Insert spaces in front of the tab to reach GOAL. Do this | |
1096 | first so that a marker at the end of the tab gets | |
1097 | adjusted. */ | |
1098 | SET_PT_BOTH (PT - 1, PT_BYTE - 1); | |
1099 | Finsert_char (make_number (' '), make_number (goal - prev_col), Qt); | |
1100 | ||
1101 | /* Now delete the tab, and indent to COL. */ | |
1102 | del_range (PT, PT + 1); | |
1103 | goal_pt = PT; | |
1104 | goal_pt_byte = PT_BYTE; | |
70ee42f7 | 1105 | Findent_to (make_number (col), Qnil); |
154a424a | 1106 | SET_PT_BOTH (goal_pt, goal_pt_byte); |
097812fb | 1107 | |
5a05d3d2 RS |
1108 | /* Set the last_known... vars consistently. */ |
1109 | col = goal; | |
993b6404 JB |
1110 | } |
1111 | ||
1112 | /* If line ends prematurely, add space to the end. */ | |
de4075cf | 1113 | if (col < goal && EQ (force, Qt)) |
230a4cbd | 1114 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
1115 | |
1116 | last_known_column = col; | |
6ec8bbd2 | 1117 | last_known_column_point = PT; |
993b6404 JB |
1118 | last_known_column_modified = MODIFF; |
1119 | ||
94d92e9c | 1120 | XSETFASTINT (val, col); |
993b6404 JB |
1121 | return val; |
1122 | } | |
1123 | \f | |
0aa01123 JB |
1124 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
1125 | ||
993b6404 JB |
1126 | struct position val_compute_motion; |
1127 | ||
1128 | /* Scan the current buffer forward from offset FROM, pretending that | |
1129 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
1130 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
1131 | and return the ending buffer position and screen location. If we |
1132 | can't hit the requested column exactly (because of a tab or other | |
1133 | multi-column character), overshoot. | |
993b6404 | 1134 | |
2ab90d49 KH |
1135 | DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings |
1136 | at FROM. This is the case if FROMVPOS and FROMVPOS came from an | |
1137 | earlier call to compute_motion. The other common case is that FROMHPOS | |
1138 | is zero and FROM is a position that "belongs" at column zero, but might | |
1139 | be shifted by overlay strings; in this case DID_MOTION should be 0. | |
1140 | ||
993b6404 JB |
1141 | WIDTH is the number of columns available to display text; |
1142 | compute_motion uses this to handle continuation lines and such. | |
361f14bf KS |
1143 | If WIDTH is -1, use width of window's text area adjusted for |
1144 | continuation glyph when needed. | |
1145 | ||
993b6404 JB |
1146 | HSCROLL is the number of columns not being displayed at the left |
1147 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
1148 | TAB_OFFSET is the number of columns of the first tab that aren't |
1149 | being displayed, perhaps because of a continuation line or | |
1150 | something. | |
993b6404 JB |
1151 | |
1152 | compute_motion returns a pointer to a struct position. The bufpos | |
1153 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
1154 | and vpos give its cartesian location. prevhpos is the column at |
1155 | which the character before bufpos started, and contin is non-zero | |
1156 | if we reached the current line by continuing the previous. | |
1157 | ||
1158 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
1159 | columns, taking HSCROLL and the truncation glyph at the left margin | |
1160 | into account. That is, beginning-of-line moves you to the hpos | |
1161 | -HSCROLL + (HSCROLL > 0). | |
993b6404 JB |
1162 | |
1163 | For example, to find the buffer position of column COL of line LINE | |
1164 | of a certain window, pass the window's starting location as FROM | |
1165 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
1166 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
1167 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
2ff4775b | 1168 | TOHPOS. |
993b6404 JB |
1169 | |
1170 | When displaying in window w, a typical formula for WIDTH is: | |
1171 | ||
1172 | window_width - 1 | |
a3c87d4e | 1173 | - (has_vertical_scroll_bars |
90022f5a KS |
1174 | ? WINDOW_CONFIG_SCROLL_BAR_COLS (window) |
1175 | : (window_width + window_left != frame_cols)) | |
993b6404 JB |
1176 | |
1177 | where | |
90022f5a KS |
1178 | window_width is XFASTINT (w->total_cols), |
1179 | window_left is XFASTINT (w->left_col), | |
a3c87d4e | 1180 | has_vertical_scroll_bars is |
90022f5a KS |
1181 | WINDOW_HAS_VERTICAL_SCROLL_BAR (window) |
1182 | and frame_cols = FRAME_COLS (XFRAME (window->frame)) | |
993b6404 | 1183 | |
90022f5a KS |
1184 | Or you can let window_box_text_cols do this all for you, and write: |
1185 | window_box_text_cols (w) - 1 | |
fa61c701 JB |
1186 | |
1187 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 1188 | accounts for window borders if the window is split horizontally, and |
1827d036 | 1189 | the scroll bars if they are turned on. */ |
993b6404 JB |
1190 | |
1191 | struct position * | |
2ab90d49 | 1192 | compute_motion (from, fromvpos, fromhpos, did_motion, to, tovpos, tohpos, width, hscroll, tab_offset, win) |
993b6404 | 1193 | int from, fromvpos, fromhpos, to, tovpos, tohpos; |
2ab90d49 | 1194 | int did_motion; |
993b6404 JB |
1195 | register int width; |
1196 | int hscroll, tab_offset; | |
88af3af4 | 1197 | struct window *win; |
993b6404 | 1198 | { |
cde9337b JB |
1199 | register int hpos = fromhpos; |
1200 | register int vpos = fromvpos; | |
1201 | ||
993b6404 | 1202 | register int pos; |
fe0066f5 | 1203 | int pos_byte; |
6bbd7a29 | 1204 | register int c = 0; |
993b6404 | 1205 | register int tab_width = XFASTINT (current_buffer->tab_width); |
56a98455 | 1206 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 1207 | register struct Lisp_Char_Table *dp = window_display_table (win); |
993b6404 | 1208 | int selective |
eeaafd4f | 1209 | = (INTEGERP (current_buffer->selective_display) |
69eaf10d RS |
1210 | ? XINT (current_buffer->selective_display) |
1211 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
993b6404 | 1212 | int selective_rlen |
eeaafd4f | 1213 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
dea4d2e6 | 1214 | ? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0); |
2ab90d49 KH |
1215 | /* The next location where the `invisible' property changes, or an |
1216 | overlay starts or ends. */ | |
1217 | int next_boundary = from; | |
993b6404 | 1218 | |
0aa01123 JB |
1219 | /* For computing runs of characters with similar widths. |
1220 | Invariant: width_run_width is zero, or all the characters | |
2ff4775b | 1221 | from width_run_start to width_run_end have a fixed width of |
0aa01123 JB |
1222 | width_run_width. */ |
1223 | int width_run_start = from; | |
1224 | int width_run_end = from; | |
1225 | int width_run_width = 0; | |
1226 | Lisp_Object *width_table; | |
66c75ca5 | 1227 | Lisp_Object buffer; |
0aa01123 JB |
1228 | |
1229 | /* The next buffer pos where we should consult the width run cache. */ | |
1230 | int next_width_run = from; | |
0e435804 | 1231 | Lisp_Object window; |
0aa01123 | 1232 | |
a997a7ca | 1233 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
c71c19f4 RS |
1234 | /* If previous char scanned was a wide character, |
1235 | this is the column where it ended. Otherwise, this is 0. */ | |
1236 | int wide_column_end_hpos = 0; | |
a997a7ca | 1237 | int prev_pos; /* Previous buffer position. */ |
fe0066f5 | 1238 | int prev_pos_byte; /* Previous buffer position. */ |
357589bf RS |
1239 | int prev_hpos = 0; |
1240 | int prev_vpos = 0; | |
a997a7ca KH |
1241 | int contin_hpos; /* HPOS of last column of continued line. */ |
1242 | int prev_tab_offset; /* Previous tab offset. */ | |
ed5c373c | 1243 | int continuation_glyph_width; |
a997a7ca | 1244 | |
66c75ca5 | 1245 | XSETBUFFER (buffer, current_buffer); |
0e435804 | 1246 | XSETWINDOW (window, win); |
66c75ca5 | 1247 | |
0aa01123 JB |
1248 | width_run_cache_on_off (); |
1249 | if (dp == buffer_display_table ()) | |
1250 | width_table = (VECTORP (current_buffer->width_table) | |
1251 | ? XVECTOR (current_buffer->width_table)->contents | |
1252 | : 0); | |
1253 | else | |
1254 | /* If the window has its own display table, we can't use the width | |
1255 | run cache, because that's based on the buffer's display table. */ | |
1256 | width_table = 0; | |
1257 | ||
e4500116 GM |
1258 | if (tab_width <= 0 || tab_width > 1000) |
1259 | tab_width = 8; | |
1260 | ||
361f14bf KS |
1261 | /* Negative width means use all available text columns. */ |
1262 | if (width < 0) | |
1263 | { | |
1264 | width = window_box_text_cols (win); | |
1265 | /* We must make room for continuation marks if we don't have fringes. */ | |
1266 | #ifdef HAVE_WINDOW_SYSTEM | |
1267 | if (!FRAME_WINDOW_P (XFRAME (win->frame))) | |
1268 | #endif | |
1269 | width -= 1; | |
1270 | } | |
1271 | ||
8cc08515 | 1272 | continuation_glyph_width = 1; |
ed5c373c | 1273 | #ifdef HAVE_WINDOW_SYSTEM |
8cc08515 KS |
1274 | if (FRAME_WINDOW_P (XFRAME (win->frame))) |
1275 | continuation_glyph_width = 0; /* In the fringe. */ | |
ed5c373c KS |
1276 | #endif |
1277 | ||
e4500116 GM |
1278 | immediate_quit = 1; |
1279 | QUIT; | |
cde9337b | 1280 | |
a997a7ca | 1281 | pos = prev_pos = from; |
fe0066f5 | 1282 | pos_byte = prev_pos_byte = CHAR_TO_BYTE (from); |
a997a7ca KH |
1283 | contin_hpos = 0; |
1284 | prev_tab_offset = tab_offset; | |
2ab90d49 KH |
1285 | while (1) |
1286 | { | |
1287 | while (pos == next_boundary) | |
f75c0f8a | 1288 | { |
fe0066f5 | 1289 | int pos_here = pos; |
98136db3 RS |
1290 | int newpos; |
1291 | ||
f9ba10b0 | 1292 | /* Don't skip invisible if we are already at the margin. */ |
8a00d895 | 1293 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
f9ba10b0 RS |
1294 | { |
1295 | if (contin_hpos && prev_hpos == 0 | |
1296 | && hpos > tohpos | |
1297 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
1298 | { /* Line breaks because we can't put the character at the | |
1299 | previous line any more. It is not the multi-column | |
1300 | character continued in middle. Go back to previous | |
1301 | buffer position, screen position, and set tab offset | |
1302 | to previous value. It's the beginning of the | |
1303 | line. */ | |
1304 | pos = prev_pos; | |
1305 | pos_byte = prev_pos_byte; | |
1306 | hpos = prev_hpos; | |
357589bf | 1307 | vpos = prev_vpos; |
f9ba10b0 RS |
1308 | tab_offset = prev_tab_offset; |
1309 | } | |
1310 | break; | |
1311 | } | |
1312 | ||
2ab90d49 KH |
1313 | /* If the caller says that the screen position came from an earlier |
1314 | call to compute_motion, then we've already accounted for the | |
1315 | overlay strings at point. This is only true the first time | |
1316 | through, so clear the flag after testing it. */ | |
1317 | if (!did_motion) | |
1318 | /* We need to skip past the overlay strings. Currently those | |
a997a7ca | 1319 | strings must not contain TAB; |
2ab90d49 KH |
1320 | if we want to relax that restriction, something will have |
1321 | to be changed here. */ | |
a997a7ca KH |
1322 | { |
1323 | unsigned char *ovstr; | |
1324 | int ovlen = overlay_strings (pos, win, &ovstr); | |
4116deee KH |
1325 | hpos += ((multibyte && ovlen > 0) |
1326 | ? strwidth (ovstr, ovlen) : ovlen); | |
a997a7ca | 1327 | } |
2ab90d49 KH |
1328 | did_motion = 0; |
1329 | ||
1330 | if (pos >= to) | |
1331 | break; | |
66c75ca5 | 1332 | |
9a21bb64 RS |
1333 | /* Advance POS past invisible characters |
1334 | (but not necessarily all that there are here), | |
1335 | and store in next_boundary the next position where | |
1336 | we need to call skip_invisible. */ | |
98136db3 RS |
1337 | newpos = skip_invisible (pos, &next_boundary, to, window); |
1338 | ||
1339 | if (newpos >= to) | |
e8cb089b RS |
1340 | { |
1341 | pos = min (to, newpos); | |
bcfbd63d | 1342 | pos_byte = CHAR_TO_BYTE (pos); |
e8cb089b RS |
1343 | goto after_loop; |
1344 | } | |
98136db3 | 1345 | |
fe0066f5 RS |
1346 | if (newpos != pos_here) |
1347 | { | |
1348 | pos = newpos; | |
1349 | pos_byte = CHAR_TO_BYTE (pos); | |
1350 | } | |
f75c0f8a | 1351 | } |
2ab90d49 KH |
1352 | |
1353 | /* Handle right margin. */ | |
a997a7ca KH |
1354 | /* Note on a wide-column character. |
1355 | ||
1356 | Characters are classified into the following three categories | |
1357 | according to the width (columns occupied on screen). | |
1358 | ||
1359 | (1) single-column character: ex. `a' | |
1360 | (2) multi-column character: ex. `^A', TAB, `\033' | |
1361 | (3) wide-column character: ex. Japanese character, Chinese character | |
1362 | (In the following example, `W_' stands for them.) | |
1363 | ||
1364 | Multi-column characters can be divided around the right margin, | |
1365 | but wide-column characters cannot. | |
1366 | ||
1367 | NOTE: | |
1368 | ||
1369 | (*) The cursor is placed on the next character after the point. | |
1370 | ||
1371 | ---------- | |
1372 | abcdefghi\ | |
1373 | j ^---- next after the point | |
1374 | ^--- next char. after the point. | |
1375 | ---------- | |
1376 | In case of sigle-column character | |
1377 | ||
1378 | ---------- | |
1379 | abcdefgh\\ | |
1380 | 033 ^---- next after the point, next char. after the point. | |
1381 | ---------- | |
1382 | In case of multi-column character | |
1383 | ||
1384 | ---------- | |
1385 | abcdefgh\\ | |
1386 | W_ ^---- next after the point | |
1387 | ^---- next char. after the point. | |
1388 | ---------- | |
097812fb | 1389 | In case of wide-column character |
a997a7ca KH |
1390 | |
1391 | The problem here is continuation at a wide-column character. | |
1392 | In this case, the line may shorter less than WIDTH. | |
1393 | And we find the continuation AFTER it occurs. | |
1394 | ||
1395 | */ | |
1396 | ||
1397 | if (hpos > width) | |
2ab90d49 KH |
1398 | { |
1399 | if (hscroll | |
1400 | || (truncate_partial_width_windows | |
ed5c373c KS |
1401 | && ((width + continuation_glyph_width) |
1402 | < FRAME_COLS (XFRAME (WINDOW_FRAME (win))))) | |
2ab90d49 KH |
1403 | || !NILP (current_buffer->truncate_lines)) |
1404 | { | |
529724fe AS |
1405 | /* Truncating: skip to newline, unless we are already past |
1406 | TO (we need to go back below). */ | |
1407 | if (pos <= to) | |
fe0066f5 RS |
1408 | { |
1409 | pos = find_before_next_newline (pos, to, 1); | |
1410 | pos_byte = CHAR_TO_BYTE (pos); | |
529724fe AS |
1411 | hpos = width; |
1412 | /* If we just skipped next_boundary, | |
1413 | loop around in the main while | |
1414 | and handle it. */ | |
1415 | if (pos >= next_boundary) | |
1416 | next_boundary = pos + 1; | |
1417 | prev_hpos = width; | |
357589bf | 1418 | prev_vpos = vpos; |
529724fe | 1419 | prev_tab_offset = tab_offset; |
fe0066f5 | 1420 | } |
2ab90d49 KH |
1421 | } |
1422 | else | |
1423 | { | |
1424 | /* Continuing. */ | |
a997a7ca KH |
1425 | /* Remember the previous value. */ |
1426 | prev_tab_offset = tab_offset; | |
1427 | ||
c9c0f7cf | 1428 | if (wide_column_end_hpos > width) |
a997a7ca KH |
1429 | { |
1430 | hpos -= prev_hpos; | |
1431 | tab_offset += prev_hpos; | |
1432 | } | |
1433 | else | |
1434 | { | |
1435 | tab_offset += width; | |
1436 | hpos -= width; | |
1437 | } | |
1438 | vpos++; | |
1439 | contin_hpos = prev_hpos; | |
1440 | prev_hpos = 0; | |
6cbc951e | 1441 | prev_vpos = vpos; |
2ab90d49 KH |
1442 | } |
1443 | } | |
1444 | ||
1445 | /* Stop if past the target buffer position or screen position. */ | |
33fe7d20 | 1446 | if (pos > to) |
a997a7ca KH |
1447 | { |
1448 | /* Go back to the previous position. */ | |
1449 | pos = prev_pos; | |
fe0066f5 | 1450 | pos_byte = prev_pos_byte; |
a997a7ca | 1451 | hpos = prev_hpos; |
357589bf | 1452 | vpos = prev_vpos; |
a997a7ca KH |
1453 | tab_offset = prev_tab_offset; |
1454 | ||
1455 | /* NOTE on contin_hpos, hpos, and prev_hpos. | |
1456 | ||
1457 | ---------- | |
1458 | abcdefgh\\ | |
1459 | W_ ^---- contin_hpos | |
1460 | | ^----- hpos | |
1461 | \---- prev_hpos | |
1462 | ---------- | |
1463 | */ | |
1464 | ||
1465 | if (contin_hpos && prev_hpos == 0 | |
c9c0f7cf | 1466 | && contin_hpos < width && !wide_column_end_hpos) |
a997a7ca KH |
1467 | { |
1468 | /* Line breaking occurs in the middle of multi-column | |
1469 | character. Go back to previous line. */ | |
1470 | hpos = contin_hpos; | |
1471 | vpos = vpos - 1; | |
1472 | } | |
a997a7ca KH |
1473 | break; |
1474 | } | |
1475 | ||
8a00d895 | 1476 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
33fe7d20 RS |
1477 | { |
1478 | if (contin_hpos && prev_hpos == 0 | |
9129bcc3 KH |
1479 | && hpos > tohpos |
1480 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
33fe7d20 RS |
1481 | { /* Line breaks because we can't put the character at the |
1482 | previous line any more. It is not the multi-column | |
1483 | character continued in middle. Go back to previous | |
1484 | buffer position, screen position, and set tab offset | |
1485 | to previous value. It's the beginning of the | |
1486 | line. */ | |
1487 | pos = prev_pos; | |
1488 | pos_byte = prev_pos_byte; | |
1489 | hpos = prev_hpos; | |
357589bf | 1490 | vpos = prev_vpos; |
33fe7d20 RS |
1491 | tab_offset = prev_tab_offset; |
1492 | } | |
1493 | break; | |
1494 | } | |
a997a7ca | 1495 | if (pos == ZV) /* We cannot go beyond ZV. Stop here. */ |
2ab90d49 KH |
1496 | break; |
1497 | ||
2ab90d49 | 1498 | prev_hpos = hpos; |
357589bf | 1499 | prev_vpos = vpos; |
a997a7ca | 1500 | prev_pos = pos; |
fe0066f5 | 1501 | prev_pos_byte = pos_byte; |
c9c0f7cf | 1502 | wide_column_end_hpos = 0; |
0aa01123 JB |
1503 | |
1504 | /* Consult the width run cache to see if we can avoid inspecting | |
1505 | the text character-by-character. */ | |
1506 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
1507 | { | |
1508 | int run_end; | |
1509 | int common_width | |
1510 | = region_cache_forward (current_buffer, | |
1511 | current_buffer->width_run_cache, | |
1512 | pos, &run_end); | |
1513 | ||
1514 | /* A width of zero means the character's width varies (like | |
1515 | a tab), is meaningless (like a newline), or we just don't | |
1516 | want to skip over it for some other reason. */ | |
1517 | if (common_width != 0) | |
1518 | { | |
1519 | int run_end_hpos; | |
1520 | ||
1521 | /* Don't go past the final buffer posn the user | |
1522 | requested. */ | |
1523 | if (run_end > to) | |
1524 | run_end = to; | |
1525 | ||
1526 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1527 | ||
1528 | /* Don't go past the final horizontal position the user | |
1529 | requested. */ | |
1530 | if (vpos == tovpos && run_end_hpos > tohpos) | |
1531 | { | |
1532 | run_end = pos + (tohpos - hpos) / common_width; | |
1533 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1534 | } | |
2ff4775b | 1535 | |
0aa01123 JB |
1536 | /* Don't go past the margin. */ |
1537 | if (run_end_hpos >= width) | |
1538 | { | |
1539 | run_end = pos + (width - hpos) / common_width; | |
1540 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1541 | } | |
1542 | ||
1543 | hpos = run_end_hpos; | |
1544 | if (run_end > pos) | |
1545 | prev_hpos = hpos - common_width; | |
fe0066f5 RS |
1546 | if (pos != run_end) |
1547 | { | |
1548 | pos = run_end; | |
1549 | pos_byte = CHAR_TO_BYTE (pos); | |
1550 | } | |
0aa01123 JB |
1551 | } |
1552 | ||
1553 | next_width_run = run_end + 1; | |
1554 | } | |
1555 | ||
1556 | /* We have to scan the text character-by-character. */ | |
993b6404 | 1557 | else |
2ab90d49 | 1558 | { |
88c6e37e GM |
1559 | EMACS_INT i, n; |
1560 | Lisp_Object charvec; | |
097812fb | 1561 | |
fe0066f5 | 1562 | c = FETCH_BYTE (pos_byte); |
012fd715 KH |
1563 | |
1564 | /* Check composition sequence. */ | |
1565 | { | |
1566 | int len, len_byte, width; | |
1567 | ||
1568 | if (check_composition (pos, pos_byte, to, &len, &len_byte, &width)) | |
1569 | { | |
1570 | pos += len; | |
1571 | pos_byte += len_byte; | |
1572 | hpos += width; | |
1573 | continue; | |
1574 | } | |
1575 | } | |
1576 | ||
fe0066f5 | 1577 | pos++, pos_byte++; |
0aa01123 | 1578 | |
2ab90d49 KH |
1579 | /* Perhaps add some info to the width_run_cache. */ |
1580 | if (current_buffer->width_run_cache) | |
1581 | { | |
1582 | /* Is this character part of the current run? If so, extend | |
1583 | the run. */ | |
1584 | if (pos - 1 == width_run_end | |
5db0afb7 | 1585 | && XFASTINT (width_table[c]) == width_run_width) |
2ab90d49 KH |
1586 | width_run_end = pos; |
1587 | ||
1588 | /* The previous run is over, since this is a character at a | |
1589 | different position, or a different width. */ | |
1590 | else | |
1591 | { | |
1592 | /* Have we accumulated a run to put in the cache? | |
1593 | (Currently, we only cache runs of width == 1). */ | |
1594 | if (width_run_start < width_run_end | |
1595 | && width_run_width == 1) | |
1596 | know_region_cache (current_buffer, | |
1597 | current_buffer->width_run_cache, | |
1598 | width_run_start, width_run_end); | |
1599 | ||
1600 | /* Start recording a new width run. */ | |
5db0afb7 | 1601 | width_run_width = XFASTINT (width_table[c]); |
2ab90d49 KH |
1602 | width_run_start = pos - 1; |
1603 | width_run_end = pos; | |
1604 | } | |
1605 | } | |
993b6404 | 1606 | |
c9c0f7cf KH |
1607 | if (dp != 0 |
1608 | && ! (multibyte && BASE_LEADING_CODE_P (c)) | |
1609 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
993b6404 | 1610 | { |
88c6e37e GM |
1611 | charvec = DISP_CHAR_VECTOR (dp, c); |
1612 | n = ASIZE (charvec); | |
993b6404 | 1613 | } |
88c6e37e | 1614 | else |
993b6404 | 1615 | { |
88c6e37e GM |
1616 | charvec = Qnil; |
1617 | n = 1; | |
1618 | } | |
1619 | ||
1620 | for (i = n - 1; i >= 0; --i) | |
1621 | { | |
1622 | if (VECTORP (charvec)) | |
2ab90d49 | 1623 | { |
88c6e37e GM |
1624 | /* This should be handled the same as |
1625 | next_element_from_display_vector does it. */ | |
1626 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 1627 | |
88c6e37e GM |
1628 | if (INTEGERP (entry) |
1629 | && GLYPH_CHAR_VALID_P (XFASTINT (entry))) | |
1630 | c = FAST_GLYPH_CHAR (XFASTINT (entry)); | |
1631 | else | |
1632 | c = ' '; | |
1633 | } | |
097812fb | 1634 | |
88c6e37e GM |
1635 | if (c >= 040 && c < 0177) |
1636 | hpos++; | |
1637 | else if (c == '\t') | |
1638 | { | |
1639 | int tem = ((hpos + tab_offset + hscroll - (hscroll > 0)) | |
1640 | % tab_width); | |
1641 | if (tem < 0) | |
1642 | tem += tab_width; | |
1643 | hpos += tab_width - tem; | |
1644 | } | |
1645 | else if (c == '\n') | |
1646 | { | |
1647 | if (selective > 0 | |
097812fb | 1648 | && indented_beyond_p (pos, pos_byte, |
76e20cb0 | 1649 | (double) selective)) /* iftc */ |
2ab90d49 | 1650 | { |
88c6e37e GM |
1651 | /* If (pos == to), we don't have to take care of |
1652 | selective display. */ | |
1653 | if (pos < to) | |
fe0066f5 | 1654 | { |
88c6e37e GM |
1655 | /* Skip any number of invisible lines all at once */ |
1656 | do | |
1657 | { | |
1658 | pos = find_before_next_newline (pos, to, 1); | |
1659 | if (pos < to) | |
1660 | pos++; | |
1661 | pos_byte = CHAR_TO_BYTE (pos); | |
1662 | } | |
1663 | while (pos < to | |
097812fb | 1664 | && indented_beyond_p (pos, pos_byte, |
76e20cb0 | 1665 | (double) selective)); /* iftc */ |
88c6e37e GM |
1666 | /* Allow for the " ..." that is displayed for them. */ |
1667 | if (selective_rlen) | |
1668 | { | |
1669 | hpos += selective_rlen; | |
1670 | if (hpos >= width) | |
1671 | hpos = width; | |
1672 | } | |
1673 | DEC_BOTH (pos, pos_byte); | |
1674 | /* We have skipped the invis text, but not the | |
1675 | newline after. */ | |
fe0066f5 | 1676 | } |
2ab90d49 | 1677 | } |
88c6e37e GM |
1678 | else |
1679 | { | |
1680 | /* A visible line. */ | |
1681 | vpos++; | |
1682 | hpos = 0; | |
1683 | hpos -= hscroll; | |
1684 | /* Count the truncation glyph on column 0 */ | |
1685 | if (hscroll > 0) | |
ed5c373c | 1686 | hpos += continuation_glyph_width; |
88c6e37e GM |
1687 | tab_offset = 0; |
1688 | } | |
1689 | contin_hpos = 0; | |
2ab90d49 | 1690 | } |
88c6e37e | 1691 | else if (c == CR && selective < 0) |
fe0066f5 | 1692 | { |
88c6e37e GM |
1693 | /* In selective display mode, |
1694 | everything from a ^M to the end of the line is invisible. | |
1695 | Stop *before* the real newline. */ | |
1696 | if (pos < to) | |
1697 | { | |
1698 | pos = find_before_next_newline (pos, to, 1); | |
1699 | pos_byte = CHAR_TO_BYTE (pos); | |
1700 | } | |
1701 | /* If we just skipped next_boundary, | |
1702 | loop around in the main while | |
1703 | and handle it. */ | |
1704 | if (pos > next_boundary) | |
1705 | next_boundary = pos; | |
1706 | /* Allow for the " ..." that is displayed for them. */ | |
1707 | if (selective_rlen) | |
1708 | { | |
1709 | hpos += selective_rlen; | |
1710 | if (hpos >= width) | |
1711 | hpos = width; | |
1712 | } | |
fe0066f5 | 1713 | } |
88c6e37e | 1714 | else if (multibyte && BASE_LEADING_CODE_P (c)) |
2ab90d49 | 1715 | { |
88c6e37e GM |
1716 | /* Start of multi-byte form. */ |
1717 | unsigned char *ptr; | |
1718 | int bytes, width, wide_column; | |
1719 | ||
1720 | pos_byte--; /* rewind POS_BYTE */ | |
1721 | ptr = BYTE_POS_ADDR (pos_byte); | |
1722 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
1723 | pos_byte += bytes; | |
1724 | if (wide_column) | |
1725 | wide_column_end_hpos = hpos + wide_column; | |
1726 | hpos += width; | |
2ab90d49 | 1727 | } |
f1004faf GM |
1728 | else if (VECTORP (charvec)) |
1729 | ++hpos; | |
88c6e37e GM |
1730 | else |
1731 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
2ab90d49 | 1732 | } |
993b6404 JB |
1733 | } |
1734 | } | |
1735 | ||
98136db3 RS |
1736 | after_loop: |
1737 | ||
0aa01123 JB |
1738 | /* Remember any final width run in the cache. */ |
1739 | if (current_buffer->width_run_cache | |
1740 | && width_run_width == 1 | |
1741 | && width_run_start < width_run_end) | |
1742 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
1743 | width_run_start, width_run_end); | |
1744 | ||
993b6404 | 1745 | val_compute_motion.bufpos = pos; |
fe0066f5 | 1746 | val_compute_motion.bytepos = pos_byte; |
cde9337b JB |
1747 | val_compute_motion.hpos = hpos; |
1748 | val_compute_motion.vpos = vpos; | |
ef3af330 AS |
1749 | if (contin_hpos && prev_hpos == 0) |
1750 | val_compute_motion.prevhpos = contin_hpos; | |
1751 | else | |
1752 | val_compute_motion.prevhpos = prev_hpos; | |
927b5a55 RS |
1753 | /* We alalways handle all of them here; none of them remain to do. */ |
1754 | val_compute_motion.ovstring_chars_done = 0; | |
993b6404 JB |
1755 | |
1756 | /* Nonzero if have just continued a line */ | |
a997a7ca | 1757 | val_compute_motion.contin = (contin_hpos && prev_hpos == 0); |
993b6404 | 1758 | |
e4500116 | 1759 | immediate_quit = 0; |
993b6404 JB |
1760 | return &val_compute_motion; |
1761 | } | |
993b6404 | 1762 | |
8720a429 | 1763 | |
88af3af4 | 1764 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
8c1a1077 PJ |
1765 | doc: /* Scan through the current buffer, calculating screen position. |
1766 | Scan the current buffer forward from offset FROM, | |
1767 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
1768 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
1769 | and return the ending buffer position and screen location. | |
1770 | ||
361f14bf KS |
1771 | If TOPOS is nil, the actual width and height of the window's |
1772 | text area are used. | |
1773 | ||
8c1a1077 PJ |
1774 | There are three additional arguments: |
1775 | ||
1776 | WIDTH is the number of columns available to display text; | |
361f14bf KS |
1777 | this affects handling of continuation lines. A value of nil |
1778 | corresponds to the actual number of available text columns. | |
8c1a1077 PJ |
1779 | |
1780 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
1781 | HSCROLL is the number of columns not being displayed at the left | |
1782 | margin; this is usually taken from a window's hscroll member. | |
1783 | TAB-OFFSET is the number of columns of the first tab that aren't | |
1784 | being displayed, perhaps because the line was continued within it. | |
1785 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
1786 | ||
1787 | WINDOW is the window to operate on. It is used to choose the display table; | |
1788 | if it is showing the current buffer, it is used also for | |
1789 | deciding which overlay properties apply. | |
1790 | Note that `compute-motion' always operates on the current buffer. | |
1791 | ||
1792 | The value is a list of five elements: | |
1793 | (POS HPOS VPOS PREVHPOS CONTIN) | |
1794 | POS is the buffer position where the scan stopped. | |
1795 | VPOS is the vertical position where the scan stopped. | |
1796 | HPOS is the horizontal position where the scan stopped. | |
1797 | ||
1798 | PREVHPOS is the horizontal position one character back from POS. | |
1799 | CONTIN is t if a line was continued after (or within) the previous character. | |
1800 | ||
1801 | For example, to find the buffer position of column COL of line LINE | |
1802 | of a certain window, pass the window's starting location as FROM | |
1803 | and the window's upper-left coordinates as FROMPOS. | |
1804 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
1805 | visible section of the buffer, and pass LINE and COL as TOPOS. */) | |
1806 | (from, frompos, to, topos, width, offsets, window) | |
42918ba5 | 1807 | Lisp_Object from, frompos, to, topos; |
88af3af4 | 1808 | Lisp_Object width, offsets, window; |
42918ba5 | 1809 | { |
361f14bf | 1810 | struct window *w; |
8798a92b | 1811 | Lisp_Object bufpos, hpos, vpos, prevhpos; |
42918ba5 RS |
1812 | struct position *pos; |
1813 | int hscroll, tab_offset; | |
1814 | ||
b7826503 PJ |
1815 | CHECK_NUMBER_COERCE_MARKER (from); |
1816 | CHECK_CONS (frompos); | |
1817 | CHECK_NUMBER_CAR (frompos); | |
1818 | CHECK_NUMBER_CDR (frompos); | |
1819 | CHECK_NUMBER_COERCE_MARKER (to); | |
361f14bf KS |
1820 | if (!NILP (topos)) |
1821 | { | |
1822 | CHECK_CONS (topos); | |
1823 | CHECK_NUMBER_CAR (topos); | |
1824 | CHECK_NUMBER_CDR (topos); | |
1825 | } | |
1826 | if (!NILP (width)) | |
1827 | CHECK_NUMBER (width); | |
1828 | ||
42918ba5 RS |
1829 | if (!NILP (offsets)) |
1830 | { | |
b7826503 PJ |
1831 | CHECK_CONS (offsets); |
1832 | CHECK_NUMBER_CAR (offsets); | |
1833 | CHECK_NUMBER_CDR (offsets); | |
70949dac KR |
1834 | hscroll = XINT (XCAR (offsets)); |
1835 | tab_offset = XINT (XCDR (offsets)); | |
42918ba5 RS |
1836 | } |
1837 | else | |
1838 | hscroll = tab_offset = 0; | |
1839 | ||
88af3af4 KH |
1840 | if (NILP (window)) |
1841 | window = Fselected_window (); | |
1842 | else | |
b7826503 | 1843 | CHECK_LIVE_WINDOW (window); |
361f14bf | 1844 | w = XWINDOW (window); |
88af3af4 | 1845 | |
9fdae274 KH |
1846 | if (XINT (from) < BEGV || XINT (from) > ZV) |
1847 | args_out_of_range_3 (from, make_number (BEGV), make_number (ZV)); | |
1848 | if (XINT (to) < BEGV || XINT (to) > ZV) | |
1849 | args_out_of_range_3 (to, make_number (BEGV), make_number (ZV)); | |
1850 | ||
70949dac KR |
1851 | pos = compute_motion (XINT (from), XINT (XCDR (frompos)), |
1852 | XINT (XCAR (frompos)), 0, | |
361f14bf KS |
1853 | XINT (to), |
1854 | (NILP (topos) | |
1855 | ? window_internal_height (w) | |
1856 | : XINT (XCDR (topos))), | |
1857 | (NILP (topos) | |
1858 | ? (window_box_text_cols (w) | |
1859 | - ( | |
1860 | #ifdef HAVE_WINDOW_SYSTEM | |
1861 | FRAME_WINDOW_P (XFRAME (w->frame)) ? 0 : | |
1862 | #endif | |
1863 | 1)) | |
1864 | : XINT (XCAR (topos))), | |
1865 | (NILP (width) ? -1 : XINT (width)), | |
1866 | hscroll, tab_offset, | |
88af3af4 | 1867 | XWINDOW (window)); |
42918ba5 | 1868 | |
94d92e9c | 1869 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
1870 | XSETINT (hpos, pos->hpos); |
1871 | XSETINT (vpos, pos->vpos); | |
1872 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
1873 | |
1874 | return Fcons (bufpos, | |
1875 | Fcons (hpos, | |
1876 | Fcons (vpos, | |
1877 | Fcons (prevhpos, | |
1878 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
1879 | ||
1880 | } | |
993b6404 | 1881 | \f |
0aa01123 | 1882 | /* Fvertical_motion and vmotion */ |
88c6e37e | 1883 | |
993b6404 JB |
1884 | struct position val_vmotion; |
1885 | ||
1886 | struct position * | |
99ce22d5 KH |
1887 | vmotion (from, vtarget, w) |
1888 | register int from, vtarget; | |
1889 | struct window *w; | |
993b6404 | 1890 | { |
99ce22d5 | 1891 | int hscroll = XINT (w->hscroll); |
993b6404 JB |
1892 | struct position pos; |
1893 | /* vpos is cumulative vertical position, changed as from is changed */ | |
1894 | register int vpos = 0; | |
2965dff9 | 1895 | int prevline; |
993b6404 | 1896 | register int first; |
fe0066f5 | 1897 | int from_byte; |
993b6404 JB |
1898 | int lmargin = hscroll > 0 ? 1 - hscroll : 0; |
1899 | int selective | |
eeaafd4f KH |
1900 | = (INTEGERP (current_buffer->selective_display) |
1901 | ? XINT (current_buffer->selective_display) | |
1902 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
99ce22d5 KH |
1903 | Lisp_Object window; |
1904 | int start_hpos = 0; | |
2ab90d49 | 1905 | int did_motion; |
7ac57cb3 RS |
1906 | /* This is the object we use for fetching character properties. */ |
1907 | Lisp_Object text_prop_object; | |
99ce22d5 KH |
1908 | |
1909 | XSETWINDOW (window, w); | |
1910 | ||
7ac57cb3 RS |
1911 | /* If the window contains this buffer, use it for getting text properties. |
1912 | Otherwise use the current buffer as arg for doing that. */ | |
1913 | if (EQ (w->buffer, Fcurrent_buffer ())) | |
1914 | text_prop_object = window; | |
1915 | else | |
1916 | text_prop_object = Fcurrent_buffer (); | |
1917 | ||
99ce22d5 | 1918 | if (vpos >= vtarget) |
993b6404 | 1919 | { |
99ce22d5 | 1920 | /* To move upward, go a line at a time until |
fe0066f5 | 1921 | we have gone at least far enough. */ |
99ce22d5 KH |
1922 | |
1923 | first = 1; | |
1924 | ||
1925 | while ((vpos > vtarget || first) && from > BEGV) | |
993b6404 | 1926 | { |
66c75ca5 RS |
1927 | Lisp_Object propval; |
1928 | ||
2965dff9 RS |
1929 | prevline = find_next_newline_no_quit (from - 1, -1); |
1930 | while (prevline > BEGV | |
5a05d3d2 | 1931 | && ((selective > 0 |
2965dff9 RS |
1932 | && indented_beyond_p (prevline, |
1933 | CHAR_TO_BYTE (prevline), | |
76e20cb0 | 1934 | (double) selective)) /* iftc */ |
2965dff9 RS |
1935 | /* Watch out for newlines with `invisible' property. |
1936 | When moving upward, check the newline before. */ | |
1937 | || (propval = Fget_char_property (make_number (prevline - 1), | |
66c75ca5 | 1938 | Qinvisible, |
7ac57cb3 | 1939 | text_prop_object), |
339ee979 | 1940 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1941 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1942 | pos = *compute_motion (prevline, 0, | |
1943 | lmargin + (prevline == BEG ? start_hpos : 0), | |
2ab90d49 | 1944 | 0, |
097812fb | 1945 | from, |
a997a7ca KH |
1946 | /* Don't care for VPOS... */ |
1947 | 1 << (BITS_PER_SHORT - 1), | |
1948 | /* ... nor HPOS. */ | |
1949 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1950 | -1, hscroll, |
2dd4e608 RS |
1951 | /* This compensates for start_hpos |
1952 | so that a tab as first character | |
1953 | still occupies 8 columns. */ | |
2965dff9 | 1954 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1955 | w); |
99ce22d5 KH |
1956 | vpos -= pos.vpos; |
1957 | first = 0; | |
2965dff9 | 1958 | from = prevline; |
993b6404 | 1959 | } |
99ce22d5 KH |
1960 | |
1961 | /* If we made exactly the desired vertical distance, | |
1962 | or if we hit beginning of buffer, | |
1963 | return point found */ | |
1964 | if (vpos >= vtarget) | |
993b6404 | 1965 | { |
99ce22d5 | 1966 | val_vmotion.bufpos = from; |
fe0066f5 | 1967 | val_vmotion.bytepos = CHAR_TO_BYTE (from); |
99ce22d5 KH |
1968 | val_vmotion.vpos = vpos; |
1969 | val_vmotion.hpos = lmargin; | |
1970 | val_vmotion.contin = 0; | |
1971 | val_vmotion.prevhpos = 0; | |
927b5a55 | 1972 | val_vmotion.ovstring_chars_done = 0; |
a997a7ca | 1973 | val_vmotion.tab_offset = 0; /* For accumulating tab offset. */ |
99ce22d5 | 1974 | return &val_vmotion; |
993b6404 | 1975 | } |
993b6404 | 1976 | |
99ce22d5 KH |
1977 | /* Otherwise find the correct spot by moving down */ |
1978 | } | |
1979 | /* Moving downward is simple, but must calculate from beg of line | |
1980 | to determine hpos of starting point */ | |
fe0066f5 RS |
1981 | from_byte = CHAR_TO_BYTE (from); |
1982 | if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n') | |
993b6404 | 1983 | { |
2ab90d49 | 1984 | Lisp_Object propval; |
66c75ca5 | 1985 | |
2965dff9 RS |
1986 | prevline = find_next_newline_no_quit (from, -1); |
1987 | while (prevline > BEGV | |
99ce22d5 | 1988 | && ((selective > 0 |
2965dff9 RS |
1989 | && indented_beyond_p (prevline, |
1990 | CHAR_TO_BYTE (prevline), | |
76e20cb0 | 1991 | (double) selective)) /* iftc */ |
2965dff9 RS |
1992 | /* Watch out for newlines with `invisible' property. |
1993 | When moving downward, check the newline after. */ | |
1994 | || (propval = Fget_char_property (make_number (prevline), | |
1995 | Qinvisible, | |
7ac57cb3 | 1996 | text_prop_object), |
339ee979 | 1997 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1998 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1999 | pos = *compute_motion (prevline, 0, | |
2000 | lmargin + (prevline == BEG | |
92992c7e | 2001 | ? start_hpos : 0), |
2ab90d49 | 2002 | 0, |
097812fb | 2003 | from, |
a997a7ca KH |
2004 | /* Don't care for VPOS... */ |
2005 | 1 << (BITS_PER_SHORT - 1), | |
2006 | /* ... nor HPOS. */ | |
2007 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 2008 | -1, hscroll, |
2965dff9 | 2009 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 2010 | w); |
2ab90d49 | 2011 | did_motion = 1; |
993b6404 | 2012 | } |
99ce22d5 | 2013 | else |
993b6404 | 2014 | { |
99ce22d5 KH |
2015 | pos.hpos = lmargin + (from == BEG ? start_hpos : 0); |
2016 | pos.vpos = 0; | |
a997a7ca | 2017 | pos.tab_offset = 0; |
2ab90d49 | 2018 | did_motion = 0; |
993b6404 | 2019 | } |
2ab90d49 | 2020 | return compute_motion (from, vpos, pos.hpos, did_motion, |
a997a7ca | 2021 | ZV, vtarget, - (1 << (BITS_PER_SHORT - 1)), |
361f14bf | 2022 | -1, hscroll, |
a997a7ca | 2023 | pos.tab_offset - (from == BEG ? start_hpos : 0), |
2dd4e608 | 2024 | w); |
993b6404 JB |
2025 | } |
2026 | ||
f1ecfe9b | 2027 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
8c1a1077 PJ |
2028 | doc: /* Move point to start of the screen line LINES lines down. |
2029 | If LINES is negative, this means moving up. | |
2030 | ||
2031 | This function is an ordinary cursor motion function | |
2032 | which calculates the new position based on how text would be displayed. | |
2033 | The new position may be the start of a line, | |
2034 | or just the start of a continuation line. | |
2035 | The function returns number of screen lines moved over; | |
2036 | that usually equals LINES, but may be closer to zero | |
2037 | if beginning or end of buffer was reached. | |
2038 | ||
2039 | The optional second argument WINDOW specifies the window to use for | |
2040 | parameters such as width, horizontal scrolling, and so on. | |
2041 | The default is to use the selected window's parameters. | |
2042 | ||
2043 | `vertical-motion' always uses the current buffer, | |
2044 | regardless of which buffer is displayed in WINDOW. | |
2045 | This is consistent with other cursor motion functions | |
2046 | and makes it possible to use `vertical-motion' in any buffer, | |
2047 | whether or not it is currently displayed in some window. */) | |
2048 | (lines, window) | |
f1ecfe9b | 2049 | Lisp_Object lines, window; |
993b6404 | 2050 | { |
8720a429 GM |
2051 | struct it it; |
2052 | struct text_pos pt; | |
8720a429 | 2053 | struct window *w; |
39210e90 GM |
2054 | Lisp_Object old_buffer; |
2055 | struct gcpro gcpro1; | |
993b6404 | 2056 | |
b7826503 | 2057 | CHECK_NUMBER (lines); |
f1ecfe9b | 2058 | if (! NILP (window)) |
b7826503 | 2059 | CHECK_WINDOW (window); |
f1ecfe9b | 2060 | else |
92992c7e | 2061 | window = selected_window; |
8720a429 | 2062 | w = XWINDOW (window); |
39210e90 GM |
2063 | |
2064 | old_buffer = Qnil; | |
2065 | GCPRO1 (old_buffer); | |
2066 | if (XBUFFER (w->buffer) != current_buffer) | |
8720a429 | 2067 | { |
39210e90 GM |
2068 | /* Set the window's buffer temporarily to the current buffer. */ |
2069 | old_buffer = w->buffer; | |
2070 | XSETBUFFER (w->buffer, current_buffer); | |
8720a429 | 2071 | } |
097812fb | 2072 | |
6df71429 | 2073 | if (noninteractive) |
9305b0e7 | 2074 | { |
6df71429 RS |
2075 | struct position pos; |
2076 | pos = *vmotion (PT, XINT (lines), w); | |
2077 | SET_PT_BOTH (pos.bufpos, pos.bytepos); | |
9305b0e7 KS |
2078 | } |
2079 | else | |
6df71429 | 2080 | { |
24a06d04 | 2081 | int it_start; |
8fd7aa51 | 2082 | int oselective; |
9e313cc1 | 2083 | int it_overshoot_expected; |
24a06d04 | 2084 | |
6df71429 RS |
2085 | SET_TEXT_POS (pt, PT, PT_BYTE); |
2086 | start_display (&it, w, pt); | |
2087 | ||
2088 | /* Scan from the start of the line containing PT. If we don't | |
2089 | do this, we start moving with IT->current_x == 0, while PT is | |
2090 | really at some x > 0. The effect is, in continuation lines, that | |
2091 | we end up with the iterator placed at where it thinks X is 0, | |
2092 | while the end position is really at some X > 0, the same X that | |
2093 | PT had. */ | |
24a06d04 | 2094 | it_start = IT_CHARPOS (it); |
14a7cabf CY |
2095 | |
2096 | /* We expect the call to move_it_to, further down, to overshoot | |
cec726f6 KH |
2097 | if the starting point is on an image, stretch glyph, |
2098 | composition, or Lisp string. We won't need to backtrack in | |
2099 | this situation, except for one corner case: when the Lisp | |
2100 | string contains a newline. */ | |
14a7cabf CY |
2101 | if (it.method == GET_FROM_STRING) |
2102 | { | |
2103 | const char *s = SDATA (it.string); | |
2104 | const char *e = s + SBYTES (it.string); | |
2105 | ||
2106 | while (s < e && *s != '\n') | |
2107 | ++s; | |
2108 | ||
9e313cc1 KS |
2109 | /* If there is no newline in the string, we need to check |
2110 | whether there is a newline immediately after the string | |
2111 | in move_it_to below. This may happen if there is an | |
2112 | overlay with an after-string just before the newline. */ | |
2113 | it_overshoot_expected = (s == e) ? -1 : 0; | |
14a7cabf CY |
2114 | } |
2115 | else | |
9e313cc1 KS |
2116 | it_overshoot_expected = (it.method == GET_FROM_IMAGE |
2117 | || it.method == GET_FROM_STRETCH | |
2118 | || it.method == GET_FROM_COMPOSITION); | |
14a7cabf | 2119 | |
b54a7539 KS |
2120 | reseat_at_previous_visible_line_start (&it); |
2121 | it.current_x = it.hpos = 0; | |
8fd7aa51 KS |
2122 | /* Temporarily disable selective display so we don't move too far */ |
2123 | oselective = it.selective; | |
2124 | it.selective = 0; | |
b54a7539 | 2125 | move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS); |
8fd7aa51 | 2126 | it.selective = oselective; |
b54a7539 KS |
2127 | |
2128 | /* Move back if we got too far. This may happen if | |
0163a0d5 | 2129 | truncate-lines is on and PT is beyond right margin. |
14a7cabf | 2130 | Don't go back if the overshoot is expected (see above). */ |
e2de7999 | 2131 | if (IT_CHARPOS (it) > it_start && XINT (lines) > 0 |
9e313cc1 KS |
2132 | && (!it_overshoot_expected |
2133 | || (it_overshoot_expected < 0 | |
2134 | && it.method == GET_FROM_BUFFER | |
2135 | && it.c == '\n'))) | |
b54a7539 | 2136 | move_it_by_lines (&it, -1, 0); |
3a46a5de | 2137 | |
b54a7539 | 2138 | it.vpos = 0; |
5bf3adc1 RS |
2139 | /* Do this even if LINES is 0, so that we move back |
2140 | to the beginning of the current line as we ought. */ | |
78744fc3 KS |
2141 | if (XINT (lines) >= 0 || IT_CHARPOS (it) > 0) |
2142 | move_it_by_lines (&it, XINT (lines), 0); | |
097812fb | 2143 | |
6df71429 RS |
2144 | SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it)); |
2145 | } | |
8720a429 | 2146 | |
39210e90 GM |
2147 | if (BUFFERP (old_buffer)) |
2148 | w->buffer = old_buffer; | |
097812fb | 2149 | |
39210e90 | 2150 | RETURN_UNGCPRO (make_number (it.vpos)); |
993b6404 | 2151 | } |
8720a429 GM |
2152 | |
2153 | ||
993b6404 | 2154 | \f |
88c6e37e | 2155 | /* File's initialization. */ |
0aa01123 | 2156 | |
dfcf069d | 2157 | void |
993b6404 JB |
2158 | syms_of_indent () |
2159 | { | |
2160 | DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode, | |
8c1a1077 PJ |
2161 | doc: /* *Indentation can insert tabs if this is non-nil. |
2162 | Setting this variable automatically makes it local to the current buffer. */); | |
993b6404 JB |
2163 | indent_tabs_mode = 1; |
2164 | ||
2165 | defsubr (&Scurrent_indentation); | |
2166 | defsubr (&Sindent_to); | |
2167 | defsubr (&Scurrent_column); | |
2168 | defsubr (&Smove_to_column); | |
2169 | defsubr (&Svertical_motion); | |
42918ba5 | 2170 | defsubr (&Scompute_motion); |
993b6404 | 2171 | } |
ab5796a9 MB |
2172 | |
2173 | /* arch-tag: 9adfea44-71f7-4988-8ee3-96da15c502cc | |
2174 | (do not change this comment) */ |