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