Commit | Line | Data |
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993b6404 | 1 | /* Indentation functions. |
73b0cd50 | 2 | Copyright (C) 1985-1988, 1993-1995, 1998, 2000-2011 |
8cabe764 | 3 | Free Software Foundation, Inc. |
993b6404 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
993b6404 | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
993b6404 JB |
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 | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
993b6404 | 19 | |
18160b98 | 20 | #include <config.h> |
4d553a13 | 21 | #include <stdio.h> |
d7306fe6 | 22 | #include <setjmp.h> |
4d553a13 | 23 | |
993b6404 JB |
24 | #include "lisp.h" |
25 | #include "buffer.h" | |
f6ed712f | 26 | #include "character.h" |
fb911777 | 27 | #include "category.h" |
d6721dda | 28 | #include "composite.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" |
d6721dda | 37 | #include "dispextern.h" |
0aa01123 | 38 | #include "region-cache.h" |
993b6404 | 39 | |
993b6404 JB |
40 | #define CR 015 |
41 | ||
79c2a4fc | 42 | /* These three values memorize the current column to avoid recalculation. */ |
88c6e37e GM |
43 | |
44 | /* Last value returned by current_column. | |
45 | Some things in set last_known_column_point to -1 | |
79c2a4fc | 46 | to mark the memorized value as invalid. */ |
88c6e37e | 47 | |
c86f7377 | 48 | static double last_known_column; |
88c6e37e GM |
49 | |
50 | /* Value of point when current_column was called. */ | |
51 | ||
83155776 | 52 | EMACS_INT last_known_column_point; |
88c6e37e GM |
53 | |
54 | /* Value of MODIFF when current_column was called. */ | |
55 | ||
c86f7377 | 56 | static int last_known_column_modified; |
993b6404 | 57 | |
f57e2426 J |
58 | static double current_column_1 (void); |
59 | static double position_indentation (int); | |
82d593eb | 60 | |
a997a7ca KH |
61 | /* Cache of beginning of line found by the last call of |
62 | current_column. */ | |
88c6e37e | 63 | |
83155776 | 64 | static EMACS_INT current_column_bol_cache; |
a997a7ca | 65 | |
993b6404 JB |
66 | /* Get the display table to use for the current buffer. */ |
67 | ||
d44f12b4 | 68 | struct Lisp_Char_Table * |
971de7fb | 69 | buffer_display_table (void) |
993b6404 JB |
70 | { |
71 | Lisp_Object thisbuf; | |
72 | ||
73 | thisbuf = current_buffer->display_table; | |
d44f12b4 RS |
74 | if (DISP_TABLE_P (thisbuf)) |
75 | return XCHAR_TABLE (thisbuf); | |
76 | if (DISP_TABLE_P (Vstandard_display_table)) | |
77 | return XCHAR_TABLE (Vstandard_display_table); | |
993b6404 JB |
78 | return 0; |
79 | } | |
80 | \f | |
0aa01123 JB |
81 | /* Width run cache considerations. */ |
82 | ||
83 | /* Return the width of character C under display table DP. */ | |
f845b8b2 | 84 | |
0aa01123 | 85 | static int |
971de7fb | 86 | character_width (int c, struct Lisp_Char_Table *dp) |
0aa01123 JB |
87 | { |
88 | Lisp_Object elt; | |
89 | ||
90 | /* These width computations were determined by examining the cases | |
91 | in display_text_line. */ | |
92 | ||
f845b8b2 | 93 | /* Everything can be handled by the display table, if it's |
0aa01123 | 94 | present and the element is right. */ |
f845b8b2 | 95 | if (dp && (elt = DISP_CHAR_VECTOR (dp, c), VECTORP (elt))) |
0aa01123 JB |
96 | return XVECTOR (elt)->size; |
97 | ||
f845b8b2 RS |
98 | /* Some characters are special. */ |
99 | if (c == '\n' || c == '\t' || c == '\015') | |
100 | return 0; | |
101 | ||
102 | /* Printing characters have width 1. */ | |
0aa01123 JB |
103 | else if (c >= 040 && c < 0177) |
104 | return 1; | |
105 | ||
106 | /* Everybody else (control characters, metacharacters) has other | |
107 | widths. We could return their actual widths here, but they | |
108 | depend on things like ctl_arrow and crud like that, and they're | |
109 | not very common at all. So we'll just claim we don't know their | |
110 | widths. */ | |
111 | else | |
112 | return 0; | |
113 | } | |
114 | ||
e0f24100 | 115 | /* Return true if the display table DISPTAB specifies the same widths |
0aa01123 JB |
116 | for characters as WIDTHTAB. We use this to decide when to |
117 | invalidate the buffer's width_run_cache. */ | |
88c6e37e | 118 | |
0aa01123 | 119 | int |
971de7fb | 120 | disptab_matches_widthtab (struct Lisp_Char_Table *disptab, struct Lisp_Vector *widthtab) |
0aa01123 JB |
121 | { |
122 | int i; | |
123 | ||
124 | if (widthtab->size != 256) | |
125 | abort (); | |
126 | ||
127 | for (i = 0; i < 256; i++) | |
128 | if (character_width (i, disptab) | |
129 | != XFASTINT (widthtab->contents[i])) | |
130 | return 0; | |
131 | ||
132 | return 1; | |
2ff4775b | 133 | } |
0aa01123 JB |
134 | |
135 | /* Recompute BUF's width table, using the display table DISPTAB. */ | |
88c6e37e | 136 | |
0aa01123 | 137 | void |
971de7fb | 138 | recompute_width_table (struct buffer *buf, struct Lisp_Char_Table *disptab) |
0aa01123 JB |
139 | { |
140 | int i; | |
228a2e1a | 141 | struct Lisp_Vector *widthtab; |
0aa01123 | 142 | |
228a2e1a KH |
143 | if (!VECTORP (buf->width_table)) |
144 | buf->width_table = Fmake_vector (make_number (256), make_number (0)); | |
145 | widthtab = XVECTOR (buf->width_table); | |
0aa01123 JB |
146 | if (widthtab->size != 256) |
147 | abort (); | |
148 | ||
149 | for (i = 0; i < 256; i++) | |
228a2e1a | 150 | XSETFASTINT (widthtab->contents[i], character_width (i, disptab)); |
0aa01123 JB |
151 | } |
152 | ||
153 | /* Allocate or free the width run cache, as requested by the current | |
154 | state of current_buffer's cache_long_line_scans variable. */ | |
88c6e37e | 155 | |
0aa01123 | 156 | static void |
971de7fb | 157 | width_run_cache_on_off (void) |
0aa01123 | 158 | { |
a997a7ca KH |
159 | if (NILP (current_buffer->cache_long_line_scans) |
160 | /* And, for the moment, this feature doesn't work on multibyte | |
161 | characters. */ | |
162 | || !NILP (current_buffer->enable_multibyte_characters)) | |
0aa01123 JB |
163 | { |
164 | /* It should be off. */ | |
165 | if (current_buffer->width_run_cache) | |
166 | { | |
167 | free_region_cache (current_buffer->width_run_cache); | |
168 | current_buffer->width_run_cache = 0; | |
169 | current_buffer->width_table = Qnil; | |
170 | } | |
171 | } | |
172 | else | |
173 | { | |
174 | /* It should be on. */ | |
175 | if (current_buffer->width_run_cache == 0) | |
2ff4775b | 176 | { |
0aa01123 | 177 | current_buffer->width_run_cache = new_region_cache (); |
0aa01123 JB |
178 | recompute_width_table (current_buffer, buffer_display_table ()); |
179 | } | |
180 | } | |
181 | } | |
182 | ||
183 | \f | |
9a21bb64 RS |
184 | /* Skip some invisible characters starting from POS. |
185 | This includes characters invisible because of text properties | |
186 | and characters invisible because of overlays. | |
187 | ||
188 | If position POS is followed by invisible characters, | |
189 | skip some of them and return the position after them. | |
190 | Otherwise return POS itself. | |
191 | ||
192 | Set *NEXT_BOUNDARY_P to the next position at which | |
193 | it will be necessary to call this function again. | |
194 | ||
195 | Don't scan past TO, and don't set *NEXT_BOUNDARY_P | |
196 | to a value greater than TO. | |
197 | ||
198 | If WINDOW is non-nil, and this buffer is displayed in WINDOW, | |
199 | take account of overlays that apply only in WINDOW. | |
200 | ||
201 | We don't necessarily skip all the invisible characters after POS | |
202 | because that could take a long time. We skip a reasonable number | |
203 | which can be skipped quickly. If there might be more invisible | |
204 | characters immediately following, then *NEXT_BOUNDARY_P | |
205 | will equal the return value. */ | |
206 | ||
83155776 | 207 | EMACS_INT |
971de7fb | 208 | skip_invisible (EMACS_INT pos, EMACS_INT *next_boundary_p, EMACS_INT to, Lisp_Object window) |
9a21bb64 | 209 | { |
2e34157c | 210 | Lisp_Object prop, position, overlay_limit, proplimit; |
2ca8b6c2 | 211 | Lisp_Object buffer, tmp; |
83155776 SM |
212 | EMACS_INT end; |
213 | int inv_p; | |
9a21bb64 RS |
214 | |
215 | XSETFASTINT (position, pos); | |
216 | XSETBUFFER (buffer, current_buffer); | |
217 | ||
218 | /* Give faster response for overlay lookup near POS. */ | |
219 | recenter_overlay_lists (current_buffer, pos); | |
220 | ||
221 | /* We must not advance farther than the next overlay change. | |
222 | The overlay change might change the invisible property; | |
223 | or there might be overlay strings to be displayed there. */ | |
224 | overlay_limit = Fnext_overlay_change (position); | |
225 | /* As for text properties, this gives a lower bound | |
226 | for where the invisible text property could change. */ | |
227 | proplimit = Fnext_property_change (position, buffer, Qt); | |
228 | if (XFASTINT (overlay_limit) < XFASTINT (proplimit)) | |
229 | proplimit = overlay_limit; | |
230 | /* PROPLIMIT is now a lower bound for the next change | |
231 | in invisible status. If that is plenty far away, | |
232 | use that lower bound. */ | |
233 | if (XFASTINT (proplimit) > pos + 100 || XFASTINT (proplimit) >= to) | |
234 | *next_boundary_p = XFASTINT (proplimit); | |
235 | /* Otherwise, scan for the next `invisible' property change. */ | |
236 | else | |
237 | { | |
238 | /* Don't scan terribly far. */ | |
239 | XSETFASTINT (proplimit, min (pos + 100, to)); | |
b55fa3c0 | 240 | /* No matter what, don't go past next overlay change. */ |
9a21bb64 RS |
241 | if (XFASTINT (overlay_limit) < XFASTINT (proplimit)) |
242 | proplimit = overlay_limit; | |
2ca8b6c2 SM |
243 | tmp = Fnext_single_property_change (position, Qinvisible, |
244 | buffer, proplimit); | |
245 | end = XFASTINT (tmp); | |
fe0066f5 | 246 | #if 0 |
a997a7ca KH |
247 | /* Don't put the boundary in the middle of multibyte form if |
248 | there is no actual property change. */ | |
249 | if (end == pos + 100 | |
250 | && !NILP (current_buffer->enable_multibyte_characters) | |
251 | && end < ZV) | |
252 | while (pos < end && !CHAR_HEAD_P (POS_ADDR (end))) | |
253 | end--; | |
fe0066f5 | 254 | #endif |
2e34157c | 255 | *next_boundary_p = end; |
9a21bb64 RS |
256 | } |
257 | /* if the `invisible' property is set, we can skip to | |
258 | the next property change */ | |
662152dd SM |
259 | prop = Fget_char_property (position, Qinvisible, |
260 | (!NILP (window) | |
261 | && EQ (XWINDOW (window)->buffer, buffer)) | |
262 | ? window : buffer); | |
263 | inv_p = TEXT_PROP_MEANS_INVISIBLE (prop); | |
264 | /* When counting columns (window == nil), don't skip over ellipsis text. */ | |
265 | if (NILP (window) ? inv_p == 1 : inv_p) | |
9a21bb64 RS |
266 | return *next_boundary_p; |
267 | return pos; | |
268 | } | |
269 | \f | |
c9c0f7cf KH |
270 | /* Set variables WIDTH and BYTES for a multibyte sequence starting at P. |
271 | ||
c9c0f7cf KH |
272 | DP is a display table or NULL. |
273 | ||
274 | This macro is used in current_column_1, Fmove_to_column, and | |
275 | compute_motion. */ | |
276 | ||
012fd715 KH |
277 | #define MULTIBYTE_BYTES_WIDTH(p, dp) \ |
278 | do { \ | |
279 | int c; \ | |
280 | \ | |
281 | wide_column = 0; \ | |
62a6e103 | 282 | c = STRING_CHAR_AND_LENGTH (p, bytes); \ |
012fd715 KH |
283 | if (BYTES_BY_CHAR_HEAD (*p) != bytes) \ |
284 | width = bytes * 4; \ | |
285 | else \ | |
286 | { \ | |
287 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) \ | |
288 | width = XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; \ | |
289 | else \ | |
f6ed712f | 290 | width = CHAR_WIDTH (c); \ |
012fd715 KH |
291 | if (width > 1) \ |
292 | wide_column = width; \ | |
293 | } \ | |
c9c0f7cf KH |
294 | } while (0) |
295 | ||
097812fb | 296 | |
993b6404 | 297 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, |
8c1a1077 PJ |
298 | doc: /* Return the horizontal position of point. Beginning of line is column 0. |
299 | This is calculated by adding together the widths of all the displayed | |
300 | representations of the character between the start of the previous line | |
7bf120f1 JB |
301 | and point (eg. control characters will have a width of 2 or 4, tabs |
302 | will have a variable width). | |
8c1a1077 PJ |
303 | Ignores finite width of frame, which means that this function may return |
304 | values greater than (frame-width). | |
305 | Whether the line is visible (if `selective-display' is t) has no effect; | |
e01732fa SM |
306 | however, ^M is treated as end of line when `selective-display' is t. |
307 | Text that has an invisible property is considered as having width 0, unless | |
308 | `buffer-invisibility-spec' specifies that it is replaced by an ellipsis. */) | |
5842a27b | 309 | (void) |
993b6404 JB |
310 | { |
311 | Lisp_Object temp; | |
097812fb | 312 | XSETFASTINT (temp, (int) current_column ()); /* iftc */ |
993b6404 JB |
313 | return temp; |
314 | } | |
315 | ||
e74928fc JB |
316 | /* Cancel any recorded value of the horizontal position. */ |
317 | ||
c9667ae1 | 318 | void |
971de7fb | 319 | invalidate_current_column (void) |
e74928fc JB |
320 | { |
321 | last_known_column_point = 0; | |
322 | } | |
323 | ||
76e20cb0 | 324 | double |
971de7fb | 325 | current_column (void) |
993b6404 JB |
326 | { |
327 | register int col; | |
328 | register unsigned char *ptr, *stop; | |
329 | register int tab_seen; | |
330 | int post_tab; | |
331 | register int c; | |
332 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 333 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 334 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
993b6404 | 335 | |
6ec8bbd2 | 336 | if (PT == last_known_column_point |
993b6404 JB |
337 | && MODIFF == last_known_column_modified) |
338 | return last_known_column; | |
339 | ||
813b81b3 RS |
340 | /* If the buffer has overlays, text properties, |
341 | or multibyte characters, use a more general algorithm. */ | |
9a21bb64 | 342 | if (BUF_INTERVALS (current_buffer) |
3ea2f6f3 SM |
343 | || current_buffer->overlays_before |
344 | || current_buffer->overlays_after | |
813b81b3 RS |
345 | || Z != Z_BYTE) |
346 | return current_column_1 (); | |
9a21bb64 RS |
347 | |
348 | /* Scan backwards from point to the previous newline, | |
349 | counting width. Tab characters are the only complicated case. */ | |
350 | ||
993b6404 | 351 | /* Make a pointer for decrementing through the chars before point. */ |
fe0066f5 | 352 | ptr = BYTE_POS_ADDR (PT_BYTE - 1) + 1; |
993b6404 JB |
353 | /* Make a pointer to where consecutive chars leave off, |
354 | going backwards from point. */ | |
6ec8bbd2 | 355 | if (PT == BEGV) |
993b6404 | 356 | stop = ptr; |
6ec8bbd2 | 357 | else if (PT <= GPT || BEGV > GPT) |
993b6404 JB |
358 | stop = BEGV_ADDR; |
359 | else | |
360 | stop = GAP_END_ADDR; | |
361 | ||
88c6e37e GM |
362 | if (tab_width <= 0 || tab_width > 1000) |
363 | tab_width = 8; | |
993b6404 JB |
364 | |
365 | col = 0, tab_seen = 0, post_tab = 0; | |
366 | ||
367 | while (1) | |
368 | { | |
88c6e37e GM |
369 | EMACS_INT i, n; |
370 | Lisp_Object charvec; | |
097812fb | 371 | |
993b6404 JB |
372 | if (ptr == stop) |
373 | { | |
374 | /* We stopped either for the beginning of the buffer | |
375 | or for the gap. */ | |
376 | if (ptr == BEGV_ADDR) | |
377 | break; | |
097812fb | 378 | |
993b6404 JB |
379 | /* It was the gap. Jump back over it. */ |
380 | stop = BEGV_ADDR; | |
381 | ptr = GPT_ADDR; | |
097812fb | 382 | |
993b6404 | 383 | /* Check whether that brings us to beginning of buffer. */ |
88c6e37e GM |
384 | if (BEGV >= GPT) |
385 | break; | |
993b6404 JB |
386 | } |
387 | ||
388 | c = *--ptr; | |
097812fb | 389 | |
88c6e37e | 390 | if (dp && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
7050d530 | 391 | { |
88c6e37e GM |
392 | charvec = DISP_CHAR_VECTOR (dp, c); |
393 | n = ASIZE (charvec); | |
7050d530 | 394 | } |
88c6e37e | 395 | else |
993b6404 | 396 | { |
88c6e37e GM |
397 | charvec = Qnil; |
398 | n = 1; | |
399 | } | |
097812fb | 400 | |
88c6e37e GM |
401 | for (i = n - 1; i >= 0; --i) |
402 | { | |
403 | if (VECTORP (charvec)) | |
404 | { | |
405 | /* This should be handled the same as | |
406 | next_element_from_display_vector does it. */ | |
407 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 408 | |
f59836fe KS |
409 | if (GLYPH_CODE_P (entry) |
410 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
411 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
412 | else |
413 | c = ' '; | |
414 | } | |
097812fb | 415 | |
88c6e37e GM |
416 | if (c >= 040 && c < 0177) |
417 | col++; | |
418 | else if (c == '\n' | |
419 | || (c == '\r' | |
420 | && EQ (current_buffer->selective_display, Qt))) | |
421 | { | |
422 | ptr++; | |
423 | goto start_of_line_found; | |
424 | } | |
425 | else if (c == '\t') | |
426 | { | |
427 | if (tab_seen) | |
428 | col = ((col + tab_width) / tab_width) * tab_width; | |
097812fb | 429 | |
88c6e37e GM |
430 | post_tab += col; |
431 | col = 0; | |
432 | tab_seen = 1; | |
433 | } | |
f1004faf GM |
434 | else if (VECTORP (charvec)) |
435 | /* With a display table entry, C is displayed as is, and | |
436 | not displayed as \NNN or as ^N. If C is a single-byte | |
437 | character, it takes one column. If C is multi-byte in | |
438 | an unibyte buffer, it's translated to unibyte, so it | |
439 | also takes one column. */ | |
440 | ++col; | |
88c6e37e GM |
441 | else |
442 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
993b6404 | 443 | } |
993b6404 JB |
444 | } |
445 | ||
88c6e37e GM |
446 | start_of_line_found: |
447 | ||
993b6404 JB |
448 | if (tab_seen) |
449 | { | |
450 | col = ((col + tab_width) / tab_width) * tab_width; | |
451 | col += post_tab; | |
452 | } | |
453 | ||
a997a7ca KH |
454 | if (ptr == BEGV_ADDR) |
455 | current_column_bol_cache = BEGV; | |
456 | else | |
fe0066f5 RS |
457 | current_column_bol_cache = BYTE_TO_CHAR (PTR_BYTE_POS (ptr)); |
458 | ||
993b6404 | 459 | last_known_column = col; |
6ec8bbd2 | 460 | last_known_column_point = PT; |
993b6404 JB |
461 | last_known_column_modified = MODIFF; |
462 | ||
463 | return col; | |
464 | } | |
465 | \f | |
80e3db56 SM |
466 | |
467 | /* Check the presence of a display property and compute its width. | |
468 | If a property was found and its width was found as well, return | |
469 | its width (>= 0) and set the position of the end of the property | |
470 | in ENDPOS. | |
471 | Otherwise just return -1. */ | |
472 | static int | |
473 | check_display_width (EMACS_INT pos, EMACS_INT col, EMACS_INT *endpos) | |
474 | { | |
475 | Lisp_Object val, overlay; | |
476 | ||
477 | if (CONSP (val = get_char_property_and_overlay | |
478 | (make_number (pos), Qdisplay, Qnil, &overlay)) | |
479 | && EQ (Qspace, XCAR (val))) | |
480 | { /* FIXME: Use calc_pixel_width_or_height, as in term.c. */ | |
481 | Lisp_Object plist = XCDR (val), prop; | |
482 | int width = -1; | |
483 | ||
484 | if ((prop = Fplist_get (plist, QCwidth), NATNUMP (prop))) | |
485 | width = XINT (prop); | |
486 | else if (FLOATP (prop)) | |
487 | width = (int)(XFLOAT_DATA (prop) + 0.5); | |
488 | else if ((prop = Fplist_get (plist, QCalign_to), NATNUMP (prop))) | |
489 | width = XINT (prop) - col; | |
490 | else if (FLOATP (prop)) | |
491 | width = (int)(XFLOAT_DATA (prop) + 0.5) - col; | |
409f2919 | 492 | |
80e3db56 SM |
493 | if (width >= 0) |
494 | { | |
495 | EMACS_INT start; | |
496 | if (OVERLAYP (overlay)) | |
497 | *endpos = OVERLAY_POSITION (OVERLAY_END (overlay)); | |
498 | else | |
499 | get_property_and_range (pos, Qdisplay, &val, &start, endpos, Qnil); | |
500 | return width; | |
501 | } | |
502 | } | |
503 | return -1; | |
504 | } | |
505 | ||
ef6f5c0e SM |
506 | /* Scanning from the beginning of the current line, stop at the buffer |
507 | position ENDPOS or at the column GOALCOL or at the end of line, whichever | |
508 | comes first. | |
509 | Return the resulting buffer position and column in ENDPOS and GOALCOL. | |
510 | PREVCOL gets set to the column of the previous position (it's always | |
511 | strictly smaller than the goal column). */ | |
512 | static void | |
513 | scan_for_column (EMACS_INT *endpos, EMACS_INT *goalcol, EMACS_INT *prevcol) | |
9a21bb64 | 514 | { |
83155776 | 515 | register EMACS_INT tab_width = XINT (current_buffer->tab_width); |
9a21bb64 RS |
516 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
517 | register struct Lisp_Char_Table *dp = buffer_display_table (); | |
fe0066f5 | 518 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
d6721dda | 519 | struct composition_it cmp_it; |
fc88345b KH |
520 | Lisp_Object window; |
521 | struct window *w; | |
9a21bb64 RS |
522 | |
523 | /* Start the scan at the beginning of this line with column number 0. */ | |
ef6f5c0e SM |
524 | register EMACS_INT col = 0, prev_col = 0; |
525 | EMACS_INT goal = goalcol ? *goalcol : MOST_POSITIVE_FIXNUM; | |
526 | EMACS_INT end = endpos ? *endpos : PT; | |
83155776 SM |
527 | EMACS_INT scan, scan_byte; |
528 | EMACS_INT next_boundary; | |
ef6f5c0e | 529 | { |
83155776 | 530 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
813b81b3 | 531 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); |
fe0066f5 RS |
532 | current_column_bol_cache = PT; |
533 | scan = PT, scan_byte = PT_BYTE; | |
534 | SET_PT_BOTH (opoint, opoint_byte); | |
535 | next_boundary = scan; | |
ef6f5c0e | 536 | } |
9a21bb64 | 537 | |
fc88345b KH |
538 | window = Fget_buffer_window (Fcurrent_buffer (), Qnil); |
539 | w = ! NILP (window) ? XWINDOW (window) : NULL; | |
540 | ||
9a21bb64 | 541 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
72af86bd | 542 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
543 | cmp_it.id = -1; |
544 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, Qnil); | |
9a21bb64 RS |
545 | |
546 | /* Scan forward to the target position. */ | |
ef6f5c0e | 547 | while (scan < end) |
9a21bb64 RS |
548 | { |
549 | int c; | |
550 | ||
551 | /* Occasionally we may need to skip invisible text. */ | |
552 | while (scan == next_boundary) | |
553 | { | |
ef6f5c0e | 554 | EMACS_INT old_scan = scan; |
9a21bb64 RS |
555 | /* This updates NEXT_BOUNDARY to the next place |
556 | where we might need to skip more invisible text. */ | |
ef6f5c0e | 557 | scan = skip_invisible (scan, &next_boundary, end, Qnil); |
fe0066f5 RS |
558 | if (scan != old_scan) |
559 | scan_byte = CHAR_TO_BYTE (scan); | |
ef6f5c0e SM |
560 | if (scan >= end) |
561 | goto endloop; | |
9a21bb64 RS |
562 | } |
563 | ||
ef6f5c0e SM |
564 | /* Test reaching the goal column. We do this after skipping |
565 | invisible characters, so that we put point before the | |
566 | character on which the cursor will appear. */ | |
567 | if (col >= goal) | |
568 | break; | |
569 | prev_col = col; | |
570 | ||
80e3db56 SM |
571 | { /* Check display property. */ |
572 | EMACS_INT end; | |
573 | int width = check_display_width (scan, col, &end); | |
574 | if (width >= 0) | |
575 | { | |
576 | col += width; | |
577 | if (end > scan) /* Avoid infinite loops with 0-width overlays. */ | |
578 | { | |
579 | scan = end; scan_byte = charpos_to_bytepos (scan); | |
580 | continue; | |
581 | } | |
582 | } | |
583 | } | |
584 | ||
d6721dda KH |
585 | /* Check composition sequence. */ |
586 | if (cmp_it.id >= 0 | |
587 | || (scan == cmp_it.stop_pos | |
588 | && composition_reseat_it (&cmp_it, scan, scan_byte, end, | |
fc88345b | 589 | w, NULL, Qnil))) |
d6721dda KH |
590 | composition_update_it (&cmp_it, scan, scan_byte, Qnil); |
591 | if (cmp_it.id >= 0) | |
592 | { | |
593 | scan += cmp_it.nchars; | |
594 | scan_byte += cmp_it.nbytes; | |
595 | if (scan <= end) | |
596 | col += cmp_it.width; | |
597 | if (cmp_it.to == cmp_it.nglyphs) | |
598 | { | |
599 | cmp_it.id = -1; | |
600 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, | |
601 | Qnil); | |
602 | } | |
603 | else | |
604 | cmp_it.from = cmp_it.to; | |
605 | continue; | |
606 | } | |
607 | ||
813b81b3 | 608 | c = FETCH_BYTE (scan_byte); |
88c6e37e | 609 | |
ef6f5c0e SM |
610 | /* See if there is a display table and it relates |
611 | to this character. */ | |
612 | ||
c9c0f7cf | 613 | if (dp != 0 |
409f2919 | 614 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 615 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
9a21bb64 | 616 | { |
d6e483a4 RS |
617 | Lisp_Object charvec; |
618 | EMACS_INT i, n; | |
619 | ||
620 | /* This character is displayed using a vector of glyphs. | |
ef6f5c0e | 621 | Update the column/position based on those glyphs. */ |
d6e483a4 | 622 | |
88c6e37e GM |
623 | charvec = DISP_CHAR_VECTOR (dp, c); |
624 | n = ASIZE (charvec); | |
88c6e37e | 625 | |
d6e483a4 | 626 | for (i = 0; i < n; i++) |
88c6e37e GM |
627 | { |
628 | /* This should be handled the same as | |
629 | next_element_from_display_vector does it. */ | |
f59836fe | 630 | Lisp_Object entry = AREF (charvec, i); |
d6e483a4 | 631 | |
f59836fe KS |
632 | if (GLYPH_CODE_P (entry) |
633 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
634 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
635 | else |
636 | c = ' '; | |
d6e483a4 RS |
637 | |
638 | if (c == '\n') | |
639 | goto endloop; | |
640 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
641 | goto endloop; | |
642 | if (c == '\t') | |
643 | { | |
d6e483a4 RS |
644 | col += tab_width; |
645 | col = col / tab_width * tab_width; | |
646 | } | |
647 | else | |
648 | ++col; | |
88c6e37e | 649 | } |
d6e483a4 RS |
650 | } |
651 | else | |
652 | { | |
ef6f5c0e SM |
653 | /* The display table doesn't affect this character; |
654 | it displays as itself. */ | |
d6e483a4 | 655 | |
88c6e37e GM |
656 | if (c == '\n') |
657 | goto endloop; | |
658 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
659 | goto endloop; | |
88c6e37e GM |
660 | if (c == '\t') |
661 | { | |
88c6e37e GM |
662 | col += tab_width; |
663 | col = col / tab_width * tab_width; | |
664 | } | |
409f2919 | 665 | else if (multibyte && LEADING_CODE_P (c)) |
88c6e37e | 666 | { |
ef6f5c0e | 667 | /* Start of multi-byte form. */ |
88c6e37e GM |
668 | unsigned char *ptr; |
669 | int bytes, width, wide_column; | |
097812fb | 670 | |
88c6e37e GM |
671 | ptr = BYTE_POS_ADDR (scan_byte); |
672 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
36974b5e RS |
673 | /* Subtract one to compensate for the increment |
674 | that is going to happen below. */ | |
ef6f5c0e | 675 | scan_byte += bytes - 1; |
88c6e37e GM |
676 | col += width; |
677 | } | |
678 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
679 | col += 2; | |
680 | else if (c < 040 || c >= 0177) | |
681 | col += 4; | |
682 | else | |
683 | col++; | |
a997a7ca | 684 | } |
d6e483a4 RS |
685 | scan++; |
686 | scan_byte++; | |
687 | ||
9a21bb64 RS |
688 | } |
689 | endloop: | |
690 | ||
691 | last_known_column = col; | |
6ec8bbd2 | 692 | last_known_column_point = PT; |
9a21bb64 RS |
693 | last_known_column_modified = MODIFF; |
694 | ||
ef6f5c0e SM |
695 | if (goalcol) |
696 | *goalcol = col; | |
697 | if (endpos) | |
698 | *endpos = scan; | |
699 | if (prevcol) | |
700 | *prevcol = prev_col; | |
701 | } | |
702 | ||
703 | /* Return the column number of position POS | |
704 | by scanning forward from the beginning of the line. | |
705 | This function handles characters that are invisible | |
706 | due to text properties or overlays. */ | |
707 | ||
708 | static double | |
971de7fb | 709 | current_column_1 (void) |
ef6f5c0e SM |
710 | { |
711 | EMACS_INT col = MOST_POSITIVE_FIXNUM; | |
712 | EMACS_INT opoint = PT; | |
713 | ||
714 | scan_for_column (&opoint, &col, NULL); | |
9a21bb64 RS |
715 | return col; |
716 | } | |
717 | \f | |
f4a6687d GM |
718 | |
719 | #if 0 /* Not used. */ | |
720 | ||
c412c808 RS |
721 | /* Return the width in columns of the part of STRING from BEG to END. |
722 | If BEG is nil, that stands for the beginning of STRING. | |
723 | If END is nil, that stands for the end of STRING. */ | |
724 | ||
76e20cb0 | 725 | static double |
382ac0bd | 726 | string_display_width (string, beg, end) |
c412c808 RS |
727 | Lisp_Object string, beg, end; |
728 | { | |
729 | register int col; | |
730 | register unsigned char *ptr, *stop; | |
731 | register int tab_seen; | |
732 | int post_tab; | |
733 | register int c; | |
734 | register int tab_width = XINT (current_buffer->tab_width); | |
735 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); | |
d44f12b4 | 736 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
c412c808 RS |
737 | int b, e; |
738 | ||
739 | if (NILP (end)) | |
d5db4077 | 740 | e = SCHARS (string); |
c412c808 RS |
741 | else |
742 | { | |
b7826503 | 743 | CHECK_NUMBER (end); |
c412c808 RS |
744 | e = XINT (end); |
745 | } | |
746 | ||
747 | if (NILP (beg)) | |
748 | b = 0; | |
749 | else | |
750 | { | |
b7826503 | 751 | CHECK_NUMBER (beg); |
c412c808 RS |
752 | b = XINT (beg); |
753 | } | |
754 | ||
755 | /* Make a pointer for decrementing through the chars before point. */ | |
d5db4077 | 756 | ptr = SDATA (string) + e; |
c412c808 RS |
757 | /* Make a pointer to where consecutive chars leave off, |
758 | going backwards from point. */ | |
d5db4077 | 759 | stop = SDATA (string) + b; |
c412c808 RS |
760 | |
761 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
762 | ||
763 | col = 0, tab_seen = 0, post_tab = 0; | |
764 | ||
765 | while (1) | |
766 | { | |
767 | if (ptr == stop) | |
768 | break; | |
769 | ||
770 | c = *--ptr; | |
771 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
772 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
773 | else if (c >= 040 && c < 0177) | |
774 | col++; | |
775 | else if (c == '\n') | |
776 | break; | |
777 | else if (c == '\t') | |
778 | { | |
779 | if (tab_seen) | |
780 | col = ((col + tab_width) / tab_width) * tab_width; | |
781 | ||
782 | post_tab += col; | |
783 | col = 0; | |
784 | tab_seen = 1; | |
785 | } | |
786 | else | |
787 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
788 | } | |
789 | ||
790 | if (tab_seen) | |
791 | { | |
792 | col = ((col + tab_width) / tab_width) * tab_width; | |
793 | col += post_tab; | |
794 | } | |
795 | ||
796 | return col; | |
797 | } | |
f4a6687d GM |
798 | |
799 | #endif /* 0 */ | |
800 | ||
c412c808 | 801 | \f |
993b6404 | 802 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
8c1a1077 | 803 | doc: /* Indent from point with tabs and spaces until COLUMN is reached. |
7bf120f1 | 804 | Optional second argument MINIMUM says always do at least MINIMUM spaces |
f64f035e EZ |
805 | even if that goes past COLUMN; by default, MINIMUM is zero. |
806 | ||
807 | The return value is COLUMN. */) | |
5842a27b | 808 | (Lisp_Object column, Lisp_Object minimum) |
993b6404 JB |
809 | { |
810 | int mincol; | |
811 | register int fromcol; | |
812 | register int tab_width = XINT (current_buffer->tab_width); | |
813 | ||
b7826503 | 814 | CHECK_NUMBER (column); |
56a98455 | 815 | if (NILP (minimum)) |
94d92e9c | 816 | XSETFASTINT (minimum, 0); |
b7826503 | 817 | CHECK_NUMBER (minimum); |
993b6404 JB |
818 | |
819 | fromcol = current_column (); | |
820 | mincol = fromcol + XINT (minimum); | |
04c98432 | 821 | if (mincol < XINT (column)) mincol = XINT (column); |
993b6404 JB |
822 | |
823 | if (fromcol == mincol) | |
824 | return make_number (mincol); | |
825 | ||
ccdcf1f5 | 826 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
827 | |
828 | if (indent_tabs_mode) | |
829 | { | |
830 | Lisp_Object n; | |
94d92e9c | 831 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
832 | if (XFASTINT (n) != 0) |
833 | { | |
6d1bd1a5 | 834 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
835 | |
836 | fromcol = (mincol / tab_width) * tab_width; | |
837 | } | |
838 | } | |
839 | ||
04c98432 EN |
840 | XSETFASTINT (column, mincol - fromcol); |
841 | Finsert_char (make_number (' '), column, Qt); | |
993b6404 JB |
842 | |
843 | last_known_column = mincol; | |
6ec8bbd2 | 844 | last_known_column_point = PT; |
993b6404 JB |
845 | last_known_column_modified = MODIFF; |
846 | ||
04c98432 EN |
847 | XSETINT (column, mincol); |
848 | return column; | |
993b6404 | 849 | } |
0aa01123 | 850 | |
993b6404 | 851 | \f |
f57e2426 | 852 | static double position_indentation (int); |
dfcf069d | 853 | |
993b6404 | 854 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, |
8c1a1077 PJ |
855 | 0, 0, 0, |
856 | doc: /* Return the indentation of the current line. | |
857 | This is the horizontal position of the character | |
858 | following any initial whitespace. */) | |
5842a27b | 859 | (void) |
993b6404 JB |
860 | { |
861 | Lisp_Object val; | |
5816888b | 862 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
fe0066f5 RS |
863 | |
864 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); | |
993b6404 | 865 | |
097812fb | 866 | XSETFASTINT (val, (int) position_indentation (PT_BYTE)); /* iftc */ |
fe0066f5 | 867 | SET_PT_BOTH (opoint, opoint_byte); |
993b6404 JB |
868 | return val; |
869 | } | |
870 | ||
76e20cb0 | 871 | static double |
971de7fb | 872 | position_indentation (register int pos_byte) |
993b6404 | 873 | { |
83155776 SM |
874 | register EMACS_INT column = 0; |
875 | register EMACS_INT tab_width = XINT (current_buffer->tab_width); | |
993b6404 JB |
876 | register unsigned char *p; |
877 | register unsigned char *stop; | |
9a21bb64 | 878 | unsigned char *start; |
83155776 SM |
879 | EMACS_INT next_boundary_byte = pos_byte; |
880 | EMACS_INT ceiling = next_boundary_byte; | |
2ff4775b | 881 | |
ccdcf1f5 | 882 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
2ff4775b | 883 | |
fe0066f5 | 884 | p = BYTE_POS_ADDR (pos_byte); |
9a21bb64 RS |
885 | /* STOP records the value of P at which we will need |
886 | to think about the gap, or about invisible text, | |
887 | or about the end of the buffer. */ | |
888 | stop = p; | |
889 | /* START records the starting value of P. */ | |
890 | start = p; | |
993b6404 JB |
891 | while (1) |
892 | { | |
893 | while (p == stop) | |
894 | { | |
83155776 | 895 | EMACS_INT stop_pos_byte; |
9a21bb64 | 896 | |
fe0066f5 RS |
897 | /* If we have updated P, set POS_BYTE to match. |
898 | The first time we enter the loop, POS_BYTE is already right. */ | |
9a21bb64 | 899 | if (p != start) |
fe0066f5 | 900 | pos_byte = PTR_BYTE_POS (p); |
9a21bb64 | 901 | /* Consider the various reasons STOP might have been set here. */ |
fe0066f5 | 902 | if (pos_byte == ZV_BYTE) |
993b6404 | 903 | return column; |
fe0066f5 RS |
904 | if (pos_byte == next_boundary_byte) |
905 | { | |
83155776 SM |
906 | EMACS_INT next_boundary; |
907 | EMACS_INT pos = BYTE_TO_CHAR (pos_byte); | |
fe0066f5 RS |
908 | pos = skip_invisible (pos, &next_boundary, ZV, Qnil); |
909 | pos_byte = CHAR_TO_BYTE (pos); | |
910 | next_boundary_byte = CHAR_TO_BYTE (next_boundary); | |
911 | } | |
912 | if (pos_byte >= ceiling) | |
913 | ceiling = BUFFER_CEILING_OF (pos_byte) + 1; | |
9a21bb64 RS |
914 | /* Compute the next place we need to stop and think, |
915 | and set STOP accordingly. */ | |
fe0066f5 | 916 | stop_pos_byte = min (ceiling, next_boundary_byte); |
9a21bb64 | 917 | /* The -1 and +1 arrange to point at the first byte of gap |
fe0066f5 | 918 | (if STOP_POS_BYTE is the position of the gap) |
9a21bb64 | 919 | rather than at the data after the gap. */ |
097812fb | 920 | |
fe0066f5 RS |
921 | stop = BYTE_POS_ADDR (stop_pos_byte - 1) + 1; |
922 | p = BYTE_POS_ADDR (pos_byte); | |
993b6404 JB |
923 | } |
924 | switch (*p++) | |
925 | { | |
fb911777 KH |
926 | case 0240: |
927 | if (! NILP (current_buffer->enable_multibyte_characters)) | |
928 | return column; | |
993b6404 JB |
929 | case ' ': |
930 | column++; | |
931 | break; | |
932 | case '\t': | |
933 | column += tab_width - column % tab_width; | |
934 | break; | |
935 | default: | |
fb911777 KH |
936 | if (ASCII_BYTE_P (p[-1]) |
937 | || NILP (current_buffer->enable_multibyte_characters)) | |
938 | return column; | |
939 | { | |
fe0066f5 RS |
940 | int c; |
941 | pos_byte = PTR_BYTE_POS (p - 1); | |
942 | c = FETCH_MULTIBYTE_CHAR (pos_byte); | |
fb911777 KH |
943 | if (CHAR_HAS_CATEGORY (c, ' ')) |
944 | { | |
945 | column++; | |
fe0066f5 RS |
946 | INC_POS (pos_byte); |
947 | p = BYTE_POS_ADDR (pos_byte); | |
fb911777 KH |
948 | } |
949 | else | |
950 | return column; | |
951 | } | |
993b6404 JB |
952 | } |
953 | } | |
954 | } | |
1b15e576 KH |
955 | |
956 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
957 | Blank lines are treated as if they had the same indentation as the | |
958 | preceding line. */ | |
fe0066f5 | 959 | |
1b15e576 | 960 | int |
5816888b | 961 | indented_beyond_p (EMACS_INT pos, EMACS_INT pos_byte, double column) |
1b15e576 | 962 | { |
76e20cb0 | 963 | double val; |
5816888b | 964 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
fe0066f5 RS |
965 | |
966 | SET_PT_BOTH (pos, pos_byte); | |
967 | while (PT > BEGV && FETCH_BYTE (PT_BYTE) == '\n') | |
968 | scan_newline (PT - 1, PT_BYTE - 1, BEGV, BEGV_BYTE, -1, 0); | |
969 | ||
d5d6f706 | 970 | val = position_indentation (PT_BYTE); |
fe0066f5 | 971 | SET_PT_BOTH (opoint, opoint_byte); |
097812fb | 972 | return val >= column; /* hmm, float comparison */ |
1b15e576 | 973 | } |
993b6404 | 974 | \f |
782d260e | 975 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, "p", |
8c1a1077 | 976 | doc: /* Move point to column COLUMN in the current line. |
3c860543 | 977 | Interactively, COLUMN is the value of prefix numeric argument. |
8c1a1077 PJ |
978 | The column of a character is calculated by adding together the widths |
979 | as displayed of the previous characters in the line. | |
980 | This function ignores line-continuation; | |
981 | there is no upper limit on the column number a character can have | |
982 | and horizontal scrolling has no effect. | |
983 | ||
984 | If specified column is within a character, point goes after that character. | |
985 | If it's past end of line, point goes to end of line. | |
986 | ||
3c860543 EZ |
987 | Optional second argument FORCE non-nil means if COLUMN is in the |
988 | middle of a tab character, change it to spaces. | |
989 | In addition, if FORCE is t, and the line is too short to reach | |
990 | COLUMN, add spaces/tabs to get there. | |
8c1a1077 PJ |
991 | |
992 | The return value is the current column. */) | |
5842a27b | 993 | (Lisp_Object column, Lisp_Object force) |
993b6404 | 994 | { |
ef6f5c0e SM |
995 | EMACS_INT pos; |
996 | EMACS_INT col, prev_col; | |
997 | EMACS_INT goal; | |
fe0066f5 | 998 | |
b7826503 | 999 | CHECK_NATNUM (column); |
993b6404 JB |
1000 | goal = XINT (column); |
1001 | ||
ef6f5c0e SM |
1002 | col = goal; |
1003 | pos = ZV; | |
1004 | scan_for_column (&pos, &col, &prev_col); | |
993b6404 | 1005 | |
ef6f5c0e | 1006 | SET_PT (pos); |
4c669c09 | 1007 | |
ef6f5c0e SM |
1008 | /* If a tab char made us overshoot, change it to spaces |
1009 | and scan through it again. */ | |
1010 | if (!NILP (force) && col > goal) | |
993b6404 | 1011 | { |
4c92f429 | 1012 | int c; |
ef6f5c0e | 1013 | EMACS_INT pos_byte = PT_BYTE; |
d6e483a4 | 1014 | |
4c92f429 AS |
1015 | DEC_POS (pos_byte); |
1016 | c = FETCH_CHAR (pos_byte); | |
ef6f5c0e | 1017 | if (c == '\t' && prev_col < goal) |
d6e483a4 | 1018 | { |
ef6f5c0e SM |
1019 | EMACS_INT goal_pt, goal_pt_byte; |
1020 | ||
1021 | /* Insert spaces in front of the tab to reach GOAL. Do this | |
1022 | first so that a marker at the end of the tab gets | |
1023 | adjusted. */ | |
1024 | SET_PT_BOTH (PT - 1, PT_BYTE - 1); | |
1025 | Finsert_char (make_number (' '), make_number (goal - prev_col), Qt); | |
1026 | ||
1027 | /* Now delete the tab, and indent to COL. */ | |
1028 | del_range (PT, PT + 1); | |
1029 | goal_pt = PT; | |
1030 | goal_pt_byte = PT_BYTE; | |
1031 | Findent_to (make_number (col), Qnil); | |
1032 | SET_PT_BOTH (goal_pt, goal_pt_byte); | |
1033 | ||
1034 | /* Set the last_known... vars consistently. */ | |
1035 | col = goal; | |
a997a7ca | 1036 | } |
993b6404 JB |
1037 | } |
1038 | ||
1039 | /* If line ends prematurely, add space to the end. */ | |
de4075cf | 1040 | if (col < goal && EQ (force, Qt)) |
230a4cbd | 1041 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
1042 | |
1043 | last_known_column = col; | |
6ec8bbd2 | 1044 | last_known_column_point = PT; |
993b6404 JB |
1045 | last_known_column_modified = MODIFF; |
1046 | ||
ef6f5c0e | 1047 | return make_number (col); |
993b6404 JB |
1048 | } |
1049 | \f | |
0aa01123 JB |
1050 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
1051 | ||
993b6404 JB |
1052 | struct position val_compute_motion; |
1053 | ||
1054 | /* Scan the current buffer forward from offset FROM, pretending that | |
1055 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
1056 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
1057 | and return the ending buffer position and screen location. If we |
1058 | can't hit the requested column exactly (because of a tab or other | |
1059 | multi-column character), overshoot. | |
993b6404 | 1060 | |
2ab90d49 KH |
1061 | DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings |
1062 | at FROM. This is the case if FROMVPOS and FROMVPOS came from an | |
1063 | earlier call to compute_motion. The other common case is that FROMHPOS | |
1064 | is zero and FROM is a position that "belongs" at column zero, but might | |
1065 | be shifted by overlay strings; in this case DID_MOTION should be 0. | |
1066 | ||
993b6404 JB |
1067 | WIDTH is the number of columns available to display text; |
1068 | compute_motion uses this to handle continuation lines and such. | |
361f14bf KS |
1069 | If WIDTH is -1, use width of window's text area adjusted for |
1070 | continuation glyph when needed. | |
1071 | ||
993b6404 JB |
1072 | HSCROLL is the number of columns not being displayed at the left |
1073 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
1074 | TAB_OFFSET is the number of columns of the first tab that aren't |
1075 | being displayed, perhaps because of a continuation line or | |
1076 | something. | |
993b6404 JB |
1077 | |
1078 | compute_motion returns a pointer to a struct position. The bufpos | |
1079 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
1080 | and vpos give its cartesian location. prevhpos is the column at |
1081 | which the character before bufpos started, and contin is non-zero | |
1082 | if we reached the current line by continuing the previous. | |
1083 | ||
1084 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
1085 | columns, taking HSCROLL and the truncation glyph at the left margin | |
1086 | into account. That is, beginning-of-line moves you to the hpos | |
1087 | -HSCROLL + (HSCROLL > 0). | |
993b6404 JB |
1088 | |
1089 | For example, to find the buffer position of column COL of line LINE | |
1090 | of a certain window, pass the window's starting location as FROM | |
1091 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
1092 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
1093 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
2ff4775b | 1094 | TOHPOS. |
993b6404 JB |
1095 | |
1096 | When displaying in window w, a typical formula for WIDTH is: | |
1097 | ||
1098 | window_width - 1 | |
a3c87d4e | 1099 | - (has_vertical_scroll_bars |
90022f5a KS |
1100 | ? WINDOW_CONFIG_SCROLL_BAR_COLS (window) |
1101 | : (window_width + window_left != frame_cols)) | |
993b6404 JB |
1102 | |
1103 | where | |
90022f5a KS |
1104 | window_width is XFASTINT (w->total_cols), |
1105 | window_left is XFASTINT (w->left_col), | |
a3c87d4e | 1106 | has_vertical_scroll_bars is |
90022f5a KS |
1107 | WINDOW_HAS_VERTICAL_SCROLL_BAR (window) |
1108 | and frame_cols = FRAME_COLS (XFRAME (window->frame)) | |
993b6404 | 1109 | |
90022f5a KS |
1110 | Or you can let window_box_text_cols do this all for you, and write: |
1111 | window_box_text_cols (w) - 1 | |
fa61c701 JB |
1112 | |
1113 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 1114 | accounts for window borders if the window is split horizontally, and |
1827d036 | 1115 | the scroll bars if they are turned on. */ |
993b6404 JB |
1116 | |
1117 | struct position * | |
971de7fb | 1118 | compute_motion (EMACS_INT from, EMACS_INT fromvpos, EMACS_INT fromhpos, int did_motion, EMACS_INT to, EMACS_INT tovpos, EMACS_INT tohpos, EMACS_INT width, EMACS_INT hscroll, EMACS_INT tab_offset, struct window *win) |
993b6404 | 1119 | { |
83155776 SM |
1120 | register EMACS_INT hpos = fromhpos; |
1121 | register EMACS_INT vpos = fromvpos; | |
cde9337b | 1122 | |
83155776 SM |
1123 | register EMACS_INT pos; |
1124 | EMACS_INT pos_byte; | |
6bbd7a29 | 1125 | register int c = 0; |
83155776 | 1126 | register EMACS_INT tab_width = XFASTINT (current_buffer->tab_width); |
56a98455 | 1127 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 1128 | register struct Lisp_Char_Table *dp = window_display_table (win); |
993b6404 | 1129 | int selective |
eeaafd4f | 1130 | = (INTEGERP (current_buffer->selective_display) |
69eaf10d RS |
1131 | ? XINT (current_buffer->selective_display) |
1132 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
993b6404 | 1133 | int selective_rlen |
eeaafd4f | 1134 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
dea4d2e6 | 1135 | ? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0); |
2ab90d49 KH |
1136 | /* The next location where the `invisible' property changes, or an |
1137 | overlay starts or ends. */ | |
83155776 | 1138 | EMACS_INT next_boundary = from; |
993b6404 | 1139 | |
0aa01123 JB |
1140 | /* For computing runs of characters with similar widths. |
1141 | Invariant: width_run_width is zero, or all the characters | |
2ff4775b | 1142 | from width_run_start to width_run_end have a fixed width of |
0aa01123 | 1143 | width_run_width. */ |
83155776 SM |
1144 | EMACS_INT width_run_start = from; |
1145 | EMACS_INT width_run_end = from; | |
1146 | EMACS_INT width_run_width = 0; | |
0aa01123 | 1147 | Lisp_Object *width_table; |
66c75ca5 | 1148 | Lisp_Object buffer; |
0aa01123 JB |
1149 | |
1150 | /* The next buffer pos where we should consult the width run cache. */ | |
83155776 | 1151 | EMACS_INT next_width_run = from; |
0e435804 | 1152 | Lisp_Object window; |
0aa01123 | 1153 | |
a997a7ca | 1154 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
c71c19f4 RS |
1155 | /* If previous char scanned was a wide character, |
1156 | this is the column where it ended. Otherwise, this is 0. */ | |
83155776 SM |
1157 | EMACS_INT wide_column_end_hpos = 0; |
1158 | EMACS_INT prev_pos; /* Previous buffer position. */ | |
1159 | EMACS_INT prev_pos_byte; /* Previous buffer position. */ | |
1160 | EMACS_INT prev_hpos = 0; | |
1161 | EMACS_INT prev_vpos = 0; | |
1162 | EMACS_INT contin_hpos; /* HPOS of last column of continued line. */ | |
1163 | EMACS_INT prev_tab_offset; /* Previous tab offset. */ | |
1164 | EMACS_INT continuation_glyph_width; | |
a997a7ca | 1165 | |
d6721dda KH |
1166 | struct composition_it cmp_it; |
1167 | ||
66c75ca5 | 1168 | XSETBUFFER (buffer, current_buffer); |
0e435804 | 1169 | XSETWINDOW (window, win); |
66c75ca5 | 1170 | |
0aa01123 JB |
1171 | width_run_cache_on_off (); |
1172 | if (dp == buffer_display_table ()) | |
1173 | width_table = (VECTORP (current_buffer->width_table) | |
1174 | ? XVECTOR (current_buffer->width_table)->contents | |
1175 | : 0); | |
1176 | else | |
1177 | /* If the window has its own display table, we can't use the width | |
1178 | run cache, because that's based on the buffer's display table. */ | |
1179 | width_table = 0; | |
1180 | ||
e4500116 GM |
1181 | if (tab_width <= 0 || tab_width > 1000) |
1182 | tab_width = 8; | |
1183 | ||
361f14bf KS |
1184 | /* Negative width means use all available text columns. */ |
1185 | if (width < 0) | |
1186 | { | |
1187 | width = window_box_text_cols (win); | |
1188 | /* We must make room for continuation marks if we don't have fringes. */ | |
1189 | #ifdef HAVE_WINDOW_SYSTEM | |
1190 | if (!FRAME_WINDOW_P (XFRAME (win->frame))) | |
1191 | #endif | |
1192 | width -= 1; | |
1193 | } | |
1194 | ||
8cc08515 | 1195 | continuation_glyph_width = 1; |
ed5c373c | 1196 | #ifdef HAVE_WINDOW_SYSTEM |
8cc08515 KS |
1197 | if (FRAME_WINDOW_P (XFRAME (win->frame))) |
1198 | continuation_glyph_width = 0; /* In the fringe. */ | |
ed5c373c KS |
1199 | #endif |
1200 | ||
e4500116 GM |
1201 | immediate_quit = 1; |
1202 | QUIT; | |
cde9337b | 1203 | |
a997a7ca | 1204 | pos = prev_pos = from; |
fe0066f5 | 1205 | pos_byte = prev_pos_byte = CHAR_TO_BYTE (from); |
a997a7ca KH |
1206 | contin_hpos = 0; |
1207 | prev_tab_offset = tab_offset; | |
72af86bd | 1208 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
1209 | cmp_it.id = -1; |
1210 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, Qnil); | |
1211 | ||
2ab90d49 KH |
1212 | while (1) |
1213 | { | |
1214 | while (pos == next_boundary) | |
f75c0f8a | 1215 | { |
83155776 SM |
1216 | EMACS_INT pos_here = pos; |
1217 | EMACS_INT newpos; | |
98136db3 | 1218 | |
f9ba10b0 | 1219 | /* Don't skip invisible if we are already at the margin. */ |
8a00d895 | 1220 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
f9ba10b0 RS |
1221 | { |
1222 | if (contin_hpos && prev_hpos == 0 | |
1223 | && hpos > tohpos | |
1224 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
1225 | { /* Line breaks because we can't put the character at the | |
1226 | previous line any more. It is not the multi-column | |
1227 | character continued in middle. Go back to previous | |
1228 | buffer position, screen position, and set tab offset | |
1229 | to previous value. It's the beginning of the | |
1230 | line. */ | |
1231 | pos = prev_pos; | |
1232 | pos_byte = prev_pos_byte; | |
1233 | hpos = prev_hpos; | |
6b61353c | 1234 | vpos = prev_vpos; |
f9ba10b0 RS |
1235 | tab_offset = prev_tab_offset; |
1236 | } | |
1237 | break; | |
1238 | } | |
1239 | ||
2ab90d49 KH |
1240 | /* If the caller says that the screen position came from an earlier |
1241 | call to compute_motion, then we've already accounted for the | |
1242 | overlay strings at point. This is only true the first time | |
1243 | through, so clear the flag after testing it. */ | |
1244 | if (!did_motion) | |
1245 | /* We need to skip past the overlay strings. Currently those | |
a997a7ca | 1246 | strings must not contain TAB; |
2ab90d49 KH |
1247 | if we want to relax that restriction, something will have |
1248 | to be changed here. */ | |
a997a7ca KH |
1249 | { |
1250 | unsigned char *ovstr; | |
5816888b | 1251 | EMACS_INT ovlen = overlay_strings (pos, win, &ovstr); |
4116deee KH |
1252 | hpos += ((multibyte && ovlen > 0) |
1253 | ? strwidth (ovstr, ovlen) : ovlen); | |
a997a7ca | 1254 | } |
2ab90d49 KH |
1255 | did_motion = 0; |
1256 | ||
1257 | if (pos >= to) | |
1258 | break; | |
66c75ca5 | 1259 | |
9a21bb64 RS |
1260 | /* Advance POS past invisible characters |
1261 | (but not necessarily all that there are here), | |
1262 | and store in next_boundary the next position where | |
1263 | we need to call skip_invisible. */ | |
98136db3 RS |
1264 | newpos = skip_invisible (pos, &next_boundary, to, window); |
1265 | ||
1266 | if (newpos >= to) | |
e8cb089b RS |
1267 | { |
1268 | pos = min (to, newpos); | |
bcfbd63d | 1269 | pos_byte = CHAR_TO_BYTE (pos); |
e8cb089b RS |
1270 | goto after_loop; |
1271 | } | |
98136db3 | 1272 | |
fe0066f5 RS |
1273 | if (newpos != pos_here) |
1274 | { | |
1275 | pos = newpos; | |
1276 | pos_byte = CHAR_TO_BYTE (pos); | |
1277 | } | |
f75c0f8a | 1278 | } |
2ab90d49 KH |
1279 | |
1280 | /* Handle right margin. */ | |
a997a7ca KH |
1281 | /* Note on a wide-column character. |
1282 | ||
1283 | Characters are classified into the following three categories | |
1284 | according to the width (columns occupied on screen). | |
1285 | ||
1286 | (1) single-column character: ex. `a' | |
1287 | (2) multi-column character: ex. `^A', TAB, `\033' | |
1288 | (3) wide-column character: ex. Japanese character, Chinese character | |
1289 | (In the following example, `W_' stands for them.) | |
1290 | ||
1291 | Multi-column characters can be divided around the right margin, | |
1292 | but wide-column characters cannot. | |
1293 | ||
1294 | NOTE: | |
1295 | ||
1296 | (*) The cursor is placed on the next character after the point. | |
1297 | ||
1298 | ---------- | |
1299 | abcdefghi\ | |
1300 | j ^---- next after the point | |
1301 | ^--- next char. after the point. | |
1302 | ---------- | |
1303 | In case of sigle-column character | |
1304 | ||
1305 | ---------- | |
1306 | abcdefgh\\ | |
1307 | 033 ^---- next after the point, next char. after the point. | |
1308 | ---------- | |
1309 | In case of multi-column character | |
1310 | ||
1311 | ---------- | |
1312 | abcdefgh\\ | |
1313 | W_ ^---- next after the point | |
1314 | ^---- next char. after the point. | |
1315 | ---------- | |
097812fb | 1316 | In case of wide-column character |
a997a7ca KH |
1317 | |
1318 | The problem here is continuation at a wide-column character. | |
1319 | In this case, the line may shorter less than WIDTH. | |
1320 | And we find the continuation AFTER it occurs. | |
1321 | ||
1322 | */ | |
1323 | ||
1324 | if (hpos > width) | |
2ab90d49 | 1325 | { |
81b6a665 CY |
1326 | int total_width = width + continuation_glyph_width; |
1327 | int truncate = 0; | |
1328 | ||
1329 | if (!NILP (Vtruncate_partial_width_windows) | |
1330 | && (total_width < FRAME_COLS (XFRAME (WINDOW_FRAME (win))))) | |
1331 | { | |
1332 | if (INTEGERP (Vtruncate_partial_width_windows)) | |
1333 | truncate | |
1334 | = total_width < XFASTINT (Vtruncate_partial_width_windows); | |
1335 | else | |
1336 | truncate = 1; | |
1337 | } | |
1338 | ||
1339 | if (hscroll || truncate | |
2ab90d49 KH |
1340 | || !NILP (current_buffer->truncate_lines)) |
1341 | { | |
529724fe AS |
1342 | /* Truncating: skip to newline, unless we are already past |
1343 | TO (we need to go back below). */ | |
1344 | if (pos <= to) | |
fe0066f5 RS |
1345 | { |
1346 | pos = find_before_next_newline (pos, to, 1); | |
1347 | pos_byte = CHAR_TO_BYTE (pos); | |
529724fe AS |
1348 | hpos = width; |
1349 | /* If we just skipped next_boundary, | |
1350 | loop around in the main while | |
1351 | and handle it. */ | |
1352 | if (pos >= next_boundary) | |
1353 | next_boundary = pos + 1; | |
1354 | prev_hpos = width; | |
6b61353c | 1355 | prev_vpos = vpos; |
529724fe | 1356 | prev_tab_offset = tab_offset; |
fe0066f5 | 1357 | } |
2ab90d49 KH |
1358 | } |
1359 | else | |
1360 | { | |
1361 | /* Continuing. */ | |
a997a7ca KH |
1362 | /* Remember the previous value. */ |
1363 | prev_tab_offset = tab_offset; | |
1364 | ||
c9c0f7cf | 1365 | if (wide_column_end_hpos > width) |
a997a7ca KH |
1366 | { |
1367 | hpos -= prev_hpos; | |
1368 | tab_offset += prev_hpos; | |
1369 | } | |
1370 | else | |
1371 | { | |
1372 | tab_offset += width; | |
1373 | hpos -= width; | |
1374 | } | |
1375 | vpos++; | |
1376 | contin_hpos = prev_hpos; | |
1377 | prev_hpos = 0; | |
6cbc951e | 1378 | prev_vpos = vpos; |
2ab90d49 KH |
1379 | } |
1380 | } | |
1381 | ||
1382 | /* Stop if past the target buffer position or screen position. */ | |
33fe7d20 | 1383 | if (pos > to) |
a997a7ca KH |
1384 | { |
1385 | /* Go back to the previous position. */ | |
1386 | pos = prev_pos; | |
fe0066f5 | 1387 | pos_byte = prev_pos_byte; |
a997a7ca | 1388 | hpos = prev_hpos; |
6b61353c | 1389 | vpos = prev_vpos; |
a997a7ca KH |
1390 | tab_offset = prev_tab_offset; |
1391 | ||
1392 | /* NOTE on contin_hpos, hpos, and prev_hpos. | |
1393 | ||
1394 | ---------- | |
1395 | abcdefgh\\ | |
1396 | W_ ^---- contin_hpos | |
1397 | | ^----- hpos | |
1398 | \---- prev_hpos | |
1399 | ---------- | |
1400 | */ | |
1401 | ||
1402 | if (contin_hpos && prev_hpos == 0 | |
c9c0f7cf | 1403 | && contin_hpos < width && !wide_column_end_hpos) |
a997a7ca KH |
1404 | { |
1405 | /* Line breaking occurs in the middle of multi-column | |
1406 | character. Go back to previous line. */ | |
1407 | hpos = contin_hpos; | |
1408 | vpos = vpos - 1; | |
1409 | } | |
a997a7ca KH |
1410 | break; |
1411 | } | |
1412 | ||
8a00d895 | 1413 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
33fe7d20 RS |
1414 | { |
1415 | if (contin_hpos && prev_hpos == 0 | |
9129bcc3 KH |
1416 | && hpos > tohpos |
1417 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
33fe7d20 RS |
1418 | { /* Line breaks because we can't put the character at the |
1419 | previous line any more. It is not the multi-column | |
1420 | character continued in middle. Go back to previous | |
1421 | buffer position, screen position, and set tab offset | |
1422 | to previous value. It's the beginning of the | |
1423 | line. */ | |
1424 | pos = prev_pos; | |
1425 | pos_byte = prev_pos_byte; | |
1426 | hpos = prev_hpos; | |
6b61353c | 1427 | vpos = prev_vpos; |
33fe7d20 RS |
1428 | tab_offset = prev_tab_offset; |
1429 | } | |
1430 | break; | |
1431 | } | |
a997a7ca | 1432 | if (pos == ZV) /* We cannot go beyond ZV. Stop here. */ |
2ab90d49 KH |
1433 | break; |
1434 | ||
2ab90d49 | 1435 | prev_hpos = hpos; |
6b61353c | 1436 | prev_vpos = vpos; |
a997a7ca | 1437 | prev_pos = pos; |
fe0066f5 | 1438 | prev_pos_byte = pos_byte; |
c9c0f7cf | 1439 | wide_column_end_hpos = 0; |
0aa01123 JB |
1440 | |
1441 | /* Consult the width run cache to see if we can avoid inspecting | |
1442 | the text character-by-character. */ | |
1443 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
1444 | { | |
c098fdb8 | 1445 | EMACS_INT run_end; |
0aa01123 JB |
1446 | int common_width |
1447 | = region_cache_forward (current_buffer, | |
1448 | current_buffer->width_run_cache, | |
1449 | pos, &run_end); | |
1450 | ||
1451 | /* A width of zero means the character's width varies (like | |
1452 | a tab), is meaningless (like a newline), or we just don't | |
1453 | want to skip over it for some other reason. */ | |
1454 | if (common_width != 0) | |
1455 | { | |
5816888b | 1456 | EMACS_INT run_end_hpos; |
0aa01123 JB |
1457 | |
1458 | /* Don't go past the final buffer posn the user | |
1459 | requested. */ | |
1460 | if (run_end > to) | |
1461 | run_end = to; | |
1462 | ||
1463 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1464 | ||
1465 | /* Don't go past the final horizontal position the user | |
1466 | requested. */ | |
1467 | if (vpos == tovpos && run_end_hpos > tohpos) | |
1468 | { | |
1469 | run_end = pos + (tohpos - hpos) / common_width; | |
1470 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1471 | } | |
2ff4775b | 1472 | |
0aa01123 JB |
1473 | /* Don't go past the margin. */ |
1474 | if (run_end_hpos >= width) | |
1475 | { | |
1476 | run_end = pos + (width - hpos) / common_width; | |
1477 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1478 | } | |
1479 | ||
1480 | hpos = run_end_hpos; | |
1481 | if (run_end > pos) | |
1482 | prev_hpos = hpos - common_width; | |
fe0066f5 RS |
1483 | if (pos != run_end) |
1484 | { | |
1485 | pos = run_end; | |
1486 | pos_byte = CHAR_TO_BYTE (pos); | |
1487 | } | |
0aa01123 JB |
1488 | } |
1489 | ||
1490 | next_width_run = run_end + 1; | |
1491 | } | |
1492 | ||
1493 | /* We have to scan the text character-by-character. */ | |
993b6404 | 1494 | else |
2ab90d49 | 1495 | { |
88c6e37e GM |
1496 | EMACS_INT i, n; |
1497 | Lisp_Object charvec; | |
097812fb | 1498 | |
012fd715 | 1499 | /* Check composition sequence. */ |
d6721dda KH |
1500 | if (cmp_it.id >= 0 |
1501 | || (pos == cmp_it.stop_pos | |
1502 | && composition_reseat_it (&cmp_it, pos, pos_byte, to, win, | |
1503 | NULL, Qnil))) | |
1504 | composition_update_it (&cmp_it, pos, pos_byte, Qnil); | |
1505 | if (cmp_it.id >= 0) | |
1506 | { | |
1507 | pos += cmp_it.nchars; | |
1508 | pos_byte += cmp_it.nbytes; | |
1509 | hpos += cmp_it.width; | |
1510 | if (cmp_it.to == cmp_it.nglyphs) | |
1511 | { | |
1512 | cmp_it.id = -1; | |
1513 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, | |
1514 | Qnil); | |
1515 | } | |
1516 | else | |
1517 | cmp_it.from = cmp_it.to; | |
1518 | continue; | |
1519 | } | |
012fd715 | 1520 | |
d6721dda | 1521 | c = FETCH_BYTE (pos_byte); |
fe0066f5 | 1522 | pos++, pos_byte++; |
0aa01123 | 1523 | |
2ab90d49 KH |
1524 | /* Perhaps add some info to the width_run_cache. */ |
1525 | if (current_buffer->width_run_cache) | |
1526 | { | |
1527 | /* Is this character part of the current run? If so, extend | |
1528 | the run. */ | |
1529 | if (pos - 1 == width_run_end | |
5db0afb7 | 1530 | && XFASTINT (width_table[c]) == width_run_width) |
2ab90d49 KH |
1531 | width_run_end = pos; |
1532 | ||
1533 | /* The previous run is over, since this is a character at a | |
1534 | different position, or a different width. */ | |
1535 | else | |
1536 | { | |
1537 | /* Have we accumulated a run to put in the cache? | |
1538 | (Currently, we only cache runs of width == 1). */ | |
1539 | if (width_run_start < width_run_end | |
1540 | && width_run_width == 1) | |
1541 | know_region_cache (current_buffer, | |
1542 | current_buffer->width_run_cache, | |
1543 | width_run_start, width_run_end); | |
1544 | ||
1545 | /* Start recording a new width run. */ | |
5db0afb7 | 1546 | width_run_width = XFASTINT (width_table[c]); |
2ab90d49 KH |
1547 | width_run_start = pos - 1; |
1548 | width_run_end = pos; | |
1549 | } | |
1550 | } | |
993b6404 | 1551 | |
c9c0f7cf | 1552 | if (dp != 0 |
409f2919 | 1553 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 1554 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
993b6404 | 1555 | { |
88c6e37e GM |
1556 | charvec = DISP_CHAR_VECTOR (dp, c); |
1557 | n = ASIZE (charvec); | |
993b6404 | 1558 | } |
88c6e37e | 1559 | else |
993b6404 | 1560 | { |
88c6e37e GM |
1561 | charvec = Qnil; |
1562 | n = 1; | |
1563 | } | |
1564 | ||
1565 | for (i = n - 1; i >= 0; --i) | |
1566 | { | |
1567 | if (VECTORP (charvec)) | |
2ab90d49 | 1568 | { |
88c6e37e GM |
1569 | /* This should be handled the same as |
1570 | next_element_from_display_vector does it. */ | |
1571 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 1572 | |
f59836fe KS |
1573 | if (GLYPH_CODE_P (entry) |
1574 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
1575 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
1576 | else |
1577 | c = ' '; | |
1578 | } | |
097812fb | 1579 | |
88c6e37e GM |
1580 | if (c >= 040 && c < 0177) |
1581 | hpos++; | |
1582 | else if (c == '\t') | |
1583 | { | |
1584 | int tem = ((hpos + tab_offset + hscroll - (hscroll > 0)) | |
1585 | % tab_width); | |
1586 | if (tem < 0) | |
1587 | tem += tab_width; | |
1588 | hpos += tab_width - tem; | |
1589 | } | |
1590 | else if (c == '\n') | |
1591 | { | |
1592 | if (selective > 0 | |
097812fb | 1593 | && indented_beyond_p (pos, pos_byte, |
76e20cb0 | 1594 | (double) selective)) /* iftc */ |
2ab90d49 | 1595 | { |
88c6e37e GM |
1596 | /* If (pos == to), we don't have to take care of |
1597 | selective display. */ | |
1598 | if (pos < to) | |
fe0066f5 | 1599 | { |
88c6e37e GM |
1600 | /* Skip any number of invisible lines all at once */ |
1601 | do | |
1602 | { | |
1603 | pos = find_before_next_newline (pos, to, 1); | |
1604 | if (pos < to) | |
1605 | pos++; | |
1606 | pos_byte = CHAR_TO_BYTE (pos); | |
1607 | } | |
1608 | while (pos < to | |
097812fb | 1609 | && indented_beyond_p (pos, pos_byte, |
76e20cb0 | 1610 | (double) selective)); /* iftc */ |
88c6e37e GM |
1611 | /* Allow for the " ..." that is displayed for them. */ |
1612 | if (selective_rlen) | |
1613 | { | |
1614 | hpos += selective_rlen; | |
1615 | if (hpos >= width) | |
1616 | hpos = width; | |
1617 | } | |
1618 | DEC_BOTH (pos, pos_byte); | |
1619 | /* We have skipped the invis text, but not the | |
1620 | newline after. */ | |
fe0066f5 | 1621 | } |
2ab90d49 | 1622 | } |
88c6e37e GM |
1623 | else |
1624 | { | |
1625 | /* A visible line. */ | |
1626 | vpos++; | |
1627 | hpos = 0; | |
1628 | hpos -= hscroll; | |
1629 | /* Count the truncation glyph on column 0 */ | |
1630 | if (hscroll > 0) | |
ed5c373c | 1631 | hpos += continuation_glyph_width; |
88c6e37e GM |
1632 | tab_offset = 0; |
1633 | } | |
1634 | contin_hpos = 0; | |
2ab90d49 | 1635 | } |
88c6e37e | 1636 | else if (c == CR && selective < 0) |
fe0066f5 | 1637 | { |
88c6e37e GM |
1638 | /* In selective display mode, |
1639 | everything from a ^M to the end of the line is invisible. | |
1640 | Stop *before* the real newline. */ | |
1641 | if (pos < to) | |
1642 | { | |
1643 | pos = find_before_next_newline (pos, to, 1); | |
1644 | pos_byte = CHAR_TO_BYTE (pos); | |
1645 | } | |
1646 | /* If we just skipped next_boundary, | |
1647 | loop around in the main while | |
1648 | and handle it. */ | |
1649 | if (pos > next_boundary) | |
1650 | next_boundary = pos; | |
1651 | /* Allow for the " ..." that is displayed for them. */ | |
1652 | if (selective_rlen) | |
1653 | { | |
1654 | hpos += selective_rlen; | |
1655 | if (hpos >= width) | |
1656 | hpos = width; | |
1657 | } | |
fe0066f5 | 1658 | } |
409f2919 | 1659 | else if (multibyte && LEADING_CODE_P (c)) |
2ab90d49 | 1660 | { |
88c6e37e GM |
1661 | /* Start of multi-byte form. */ |
1662 | unsigned char *ptr; | |
1663 | int bytes, width, wide_column; | |
1664 | ||
1665 | pos_byte--; /* rewind POS_BYTE */ | |
1666 | ptr = BYTE_POS_ADDR (pos_byte); | |
1667 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
1668 | pos_byte += bytes; | |
1669 | if (wide_column) | |
1670 | wide_column_end_hpos = hpos + wide_column; | |
1671 | hpos += width; | |
2ab90d49 | 1672 | } |
f1004faf GM |
1673 | else if (VECTORP (charvec)) |
1674 | ++hpos; | |
88c6e37e GM |
1675 | else |
1676 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
2ab90d49 | 1677 | } |
993b6404 JB |
1678 | } |
1679 | } | |
1680 | ||
98136db3 RS |
1681 | after_loop: |
1682 | ||
0aa01123 JB |
1683 | /* Remember any final width run in the cache. */ |
1684 | if (current_buffer->width_run_cache | |
1685 | && width_run_width == 1 | |
1686 | && width_run_start < width_run_end) | |
1687 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
1688 | width_run_start, width_run_end); | |
1689 | ||
993b6404 | 1690 | val_compute_motion.bufpos = pos; |
fe0066f5 | 1691 | val_compute_motion.bytepos = pos_byte; |
cde9337b JB |
1692 | val_compute_motion.hpos = hpos; |
1693 | val_compute_motion.vpos = vpos; | |
ef3af330 AS |
1694 | if (contin_hpos && prev_hpos == 0) |
1695 | val_compute_motion.prevhpos = contin_hpos; | |
1696 | else | |
1697 | val_compute_motion.prevhpos = prev_hpos; | |
927b5a55 RS |
1698 | /* We alalways handle all of them here; none of them remain to do. */ |
1699 | val_compute_motion.ovstring_chars_done = 0; | |
993b6404 JB |
1700 | |
1701 | /* Nonzero if have just continued a line */ | |
a997a7ca | 1702 | val_compute_motion.contin = (contin_hpos && prev_hpos == 0); |
993b6404 | 1703 | |
e4500116 | 1704 | immediate_quit = 0; |
993b6404 JB |
1705 | return &val_compute_motion; |
1706 | } | |
993b6404 | 1707 | |
8720a429 | 1708 | |
88af3af4 | 1709 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
8c1a1077 PJ |
1710 | doc: /* Scan through the current buffer, calculating screen position. |
1711 | Scan the current buffer forward from offset FROM, | |
1712 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
1713 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
1714 | and return the ending buffer position and screen location. | |
1715 | ||
361f14bf KS |
1716 | If TOPOS is nil, the actual width and height of the window's |
1717 | text area are used. | |
1718 | ||
8c1a1077 PJ |
1719 | There are three additional arguments: |
1720 | ||
1721 | WIDTH is the number of columns available to display text; | |
361f14bf KS |
1722 | this affects handling of continuation lines. A value of nil |
1723 | corresponds to the actual number of available text columns. | |
8c1a1077 PJ |
1724 | |
1725 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
1726 | HSCROLL is the number of columns not being displayed at the left | |
1727 | margin; this is usually taken from a window's hscroll member. | |
1728 | TAB-OFFSET is the number of columns of the first tab that aren't | |
1729 | being displayed, perhaps because the line was continued within it. | |
1730 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
1731 | ||
1732 | WINDOW is the window to operate on. It is used to choose the display table; | |
1733 | if it is showing the current buffer, it is used also for | |
1734 | deciding which overlay properties apply. | |
1735 | Note that `compute-motion' always operates on the current buffer. | |
1736 | ||
1737 | The value is a list of five elements: | |
1738 | (POS HPOS VPOS PREVHPOS CONTIN) | |
1739 | POS is the buffer position where the scan stopped. | |
1740 | VPOS is the vertical position where the scan stopped. | |
1741 | HPOS is the horizontal position where the scan stopped. | |
1742 | ||
1743 | PREVHPOS is the horizontal position one character back from POS. | |
1744 | CONTIN is t if a line was continued after (or within) the previous character. | |
1745 | ||
1746 | For example, to find the buffer position of column COL of line LINE | |
1747 | of a certain window, pass the window's starting location as FROM | |
1748 | and the window's upper-left coordinates as FROMPOS. | |
1749 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
1750 | visible section of the buffer, and pass LINE and COL as TOPOS. */) | |
5842a27b | 1751 | (Lisp_Object from, Lisp_Object frompos, Lisp_Object to, Lisp_Object topos, Lisp_Object width, Lisp_Object offsets, Lisp_Object window) |
42918ba5 | 1752 | { |
361f14bf | 1753 | struct window *w; |
8798a92b | 1754 | Lisp_Object bufpos, hpos, vpos, prevhpos; |
42918ba5 RS |
1755 | struct position *pos; |
1756 | int hscroll, tab_offset; | |
1757 | ||
b7826503 PJ |
1758 | CHECK_NUMBER_COERCE_MARKER (from); |
1759 | CHECK_CONS (frompos); | |
1760 | CHECK_NUMBER_CAR (frompos); | |
1761 | CHECK_NUMBER_CDR (frompos); | |
1762 | CHECK_NUMBER_COERCE_MARKER (to); | |
361f14bf KS |
1763 | if (!NILP (topos)) |
1764 | { | |
1765 | CHECK_CONS (topos); | |
1766 | CHECK_NUMBER_CAR (topos); | |
1767 | CHECK_NUMBER_CDR (topos); | |
1768 | } | |
1769 | if (!NILP (width)) | |
1770 | CHECK_NUMBER (width); | |
1771 | ||
42918ba5 RS |
1772 | if (!NILP (offsets)) |
1773 | { | |
b7826503 PJ |
1774 | CHECK_CONS (offsets); |
1775 | CHECK_NUMBER_CAR (offsets); | |
1776 | CHECK_NUMBER_CDR (offsets); | |
70949dac KR |
1777 | hscroll = XINT (XCAR (offsets)); |
1778 | tab_offset = XINT (XCDR (offsets)); | |
42918ba5 RS |
1779 | } |
1780 | else | |
1781 | hscroll = tab_offset = 0; | |
1782 | ||
88af3af4 KH |
1783 | if (NILP (window)) |
1784 | window = Fselected_window (); | |
1785 | else | |
b7826503 | 1786 | CHECK_LIVE_WINDOW (window); |
361f14bf | 1787 | w = XWINDOW (window); |
88af3af4 | 1788 | |
9fdae274 KH |
1789 | if (XINT (from) < BEGV || XINT (from) > ZV) |
1790 | args_out_of_range_3 (from, make_number (BEGV), make_number (ZV)); | |
1791 | if (XINT (to) < BEGV || XINT (to) > ZV) | |
1792 | args_out_of_range_3 (to, make_number (BEGV), make_number (ZV)); | |
1793 | ||
70949dac KR |
1794 | pos = compute_motion (XINT (from), XINT (XCDR (frompos)), |
1795 | XINT (XCAR (frompos)), 0, | |
361f14bf KS |
1796 | XINT (to), |
1797 | (NILP (topos) | |
1798 | ? window_internal_height (w) | |
1799 | : XINT (XCDR (topos))), | |
1800 | (NILP (topos) | |
1801 | ? (window_box_text_cols (w) | |
1802 | - ( | |
1803 | #ifdef HAVE_WINDOW_SYSTEM | |
1804 | FRAME_WINDOW_P (XFRAME (w->frame)) ? 0 : | |
1805 | #endif | |
1806 | 1)) | |
1807 | : XINT (XCAR (topos))), | |
1808 | (NILP (width) ? -1 : XINT (width)), | |
1809 | hscroll, tab_offset, | |
88af3af4 | 1810 | XWINDOW (window)); |
42918ba5 | 1811 | |
94d92e9c | 1812 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
1813 | XSETINT (hpos, pos->hpos); |
1814 | XSETINT (vpos, pos->vpos); | |
1815 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
1816 | |
1817 | return Fcons (bufpos, | |
1818 | Fcons (hpos, | |
1819 | Fcons (vpos, | |
1820 | Fcons (prevhpos, | |
1821 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
1822 | ||
1823 | } | |
993b6404 | 1824 | \f |
0aa01123 | 1825 | /* Fvertical_motion and vmotion */ |
88c6e37e | 1826 | |
993b6404 JB |
1827 | struct position val_vmotion; |
1828 | ||
1829 | struct position * | |
971de7fb | 1830 | vmotion (register EMACS_INT from, register EMACS_INT vtarget, struct window *w) |
993b6404 | 1831 | { |
83155776 | 1832 | EMACS_INT hscroll = XINT (w->hscroll); |
993b6404 JB |
1833 | struct position pos; |
1834 | /* vpos is cumulative vertical position, changed as from is changed */ | |
1835 | register int vpos = 0; | |
83155776 SM |
1836 | EMACS_INT prevline; |
1837 | register EMACS_INT first; | |
1838 | EMACS_INT from_byte; | |
1839 | EMACS_INT lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
993b6404 | 1840 | int selective |
eeaafd4f KH |
1841 | = (INTEGERP (current_buffer->selective_display) |
1842 | ? XINT (current_buffer->selective_display) | |
1843 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
99ce22d5 | 1844 | Lisp_Object window; |
83155776 | 1845 | EMACS_INT start_hpos = 0; |
2ab90d49 | 1846 | int did_motion; |
7ac57cb3 RS |
1847 | /* This is the object we use for fetching character properties. */ |
1848 | Lisp_Object text_prop_object; | |
99ce22d5 KH |
1849 | |
1850 | XSETWINDOW (window, w); | |
1851 | ||
7ac57cb3 RS |
1852 | /* If the window contains this buffer, use it for getting text properties. |
1853 | Otherwise use the current buffer as arg for doing that. */ | |
1854 | if (EQ (w->buffer, Fcurrent_buffer ())) | |
1855 | text_prop_object = window; | |
1856 | else | |
1857 | text_prop_object = Fcurrent_buffer (); | |
1858 | ||
99ce22d5 | 1859 | if (vpos >= vtarget) |
993b6404 | 1860 | { |
99ce22d5 | 1861 | /* To move upward, go a line at a time until |
fe0066f5 | 1862 | we have gone at least far enough. */ |
99ce22d5 KH |
1863 | |
1864 | first = 1; | |
1865 | ||
1866 | while ((vpos > vtarget || first) && from > BEGV) | |
993b6404 | 1867 | { |
66c75ca5 RS |
1868 | Lisp_Object propval; |
1869 | ||
2965dff9 RS |
1870 | prevline = find_next_newline_no_quit (from - 1, -1); |
1871 | while (prevline > BEGV | |
5a05d3d2 | 1872 | && ((selective > 0 |
2965dff9 RS |
1873 | && indented_beyond_p (prevline, |
1874 | CHAR_TO_BYTE (prevline), | |
76e20cb0 | 1875 | (double) selective)) /* iftc */ |
2965dff9 RS |
1876 | /* Watch out for newlines with `invisible' property. |
1877 | When moving upward, check the newline before. */ | |
1878 | || (propval = Fget_char_property (make_number (prevline - 1), | |
66c75ca5 | 1879 | Qinvisible, |
7ac57cb3 | 1880 | text_prop_object), |
339ee979 | 1881 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1882 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1883 | pos = *compute_motion (prevline, 0, | |
1884 | lmargin + (prevline == BEG ? start_hpos : 0), | |
2ab90d49 | 1885 | 0, |
097812fb | 1886 | from, |
a997a7ca KH |
1887 | /* Don't care for VPOS... */ |
1888 | 1 << (BITS_PER_SHORT - 1), | |
1889 | /* ... nor HPOS. */ | |
1890 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1891 | -1, hscroll, |
2dd4e608 RS |
1892 | /* This compensates for start_hpos |
1893 | so that a tab as first character | |
1894 | still occupies 8 columns. */ | |
2965dff9 | 1895 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1896 | w); |
99ce22d5 KH |
1897 | vpos -= pos.vpos; |
1898 | first = 0; | |
2965dff9 | 1899 | from = prevline; |
993b6404 | 1900 | } |
99ce22d5 KH |
1901 | |
1902 | /* If we made exactly the desired vertical distance, | |
1903 | or if we hit beginning of buffer, | |
1904 | return point found */ | |
1905 | if (vpos >= vtarget) | |
993b6404 | 1906 | { |
99ce22d5 | 1907 | val_vmotion.bufpos = from; |
fe0066f5 | 1908 | val_vmotion.bytepos = CHAR_TO_BYTE (from); |
99ce22d5 KH |
1909 | val_vmotion.vpos = vpos; |
1910 | val_vmotion.hpos = lmargin; | |
1911 | val_vmotion.contin = 0; | |
1912 | val_vmotion.prevhpos = 0; | |
927b5a55 | 1913 | val_vmotion.ovstring_chars_done = 0; |
a997a7ca | 1914 | val_vmotion.tab_offset = 0; /* For accumulating tab offset. */ |
99ce22d5 | 1915 | return &val_vmotion; |
993b6404 | 1916 | } |
993b6404 | 1917 | |
99ce22d5 KH |
1918 | /* Otherwise find the correct spot by moving down */ |
1919 | } | |
1920 | /* Moving downward is simple, but must calculate from beg of line | |
1921 | to determine hpos of starting point */ | |
fe0066f5 RS |
1922 | from_byte = CHAR_TO_BYTE (from); |
1923 | if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n') | |
993b6404 | 1924 | { |
2ab90d49 | 1925 | Lisp_Object propval; |
66c75ca5 | 1926 | |
2965dff9 RS |
1927 | prevline = find_next_newline_no_quit (from, -1); |
1928 | while (prevline > BEGV | |
99ce22d5 | 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 downward, check the newline after. */ | |
1935 | || (propval = Fget_char_property (make_number (prevline), | |
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 | |
92992c7e | 1942 | ? start_hpos : 0), |
2ab90d49 | 1943 | 0, |
097812fb | 1944 | from, |
a997a7ca KH |
1945 | /* Don't care for VPOS... */ |
1946 | 1 << (BITS_PER_SHORT - 1), | |
1947 | /* ... nor HPOS. */ | |
1948 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1949 | -1, hscroll, |
2965dff9 | 1950 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1951 | w); |
2ab90d49 | 1952 | did_motion = 1; |
993b6404 | 1953 | } |
99ce22d5 | 1954 | else |
993b6404 | 1955 | { |
99ce22d5 KH |
1956 | pos.hpos = lmargin + (from == BEG ? start_hpos : 0); |
1957 | pos.vpos = 0; | |
a997a7ca | 1958 | pos.tab_offset = 0; |
2ab90d49 | 1959 | did_motion = 0; |
993b6404 | 1960 | } |
2ab90d49 | 1961 | return compute_motion (from, vpos, pos.hpos, did_motion, |
a997a7ca | 1962 | ZV, vtarget, - (1 << (BITS_PER_SHORT - 1)), |
361f14bf | 1963 | -1, hscroll, |
a997a7ca | 1964 | pos.tab_offset - (from == BEG ? start_hpos : 0), |
2dd4e608 | 1965 | w); |
993b6404 JB |
1966 | } |
1967 | ||
f1ecfe9b | 1968 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
8c1a1077 PJ |
1969 | doc: /* Move point to start of the screen line LINES lines down. |
1970 | If LINES is negative, this means moving up. | |
1971 | ||
1972 | This function is an ordinary cursor motion function | |
1973 | which calculates the new position based on how text would be displayed. | |
1974 | The new position may be the start of a line, | |
1975 | or just the start of a continuation line. | |
1976 | The function returns number of screen lines moved over; | |
1977 | that usually equals LINES, but may be closer to zero | |
1978 | if beginning or end of buffer was reached. | |
1979 | ||
1980 | The optional second argument WINDOW specifies the window to use for | |
1981 | parameters such as width, horizontal scrolling, and so on. | |
1982 | The default is to use the selected window's parameters. | |
1983 | ||
c876b227 SM |
1984 | LINES can optionally take the form (COLS . LINES), in which case |
1985 | the motion will not stop at the start of a screen line but on | |
1986 | its column COLS (if such exists on that line, that is). | |
1987 | ||
8c1a1077 PJ |
1988 | `vertical-motion' always uses the current buffer, |
1989 | regardless of which buffer is displayed in WINDOW. | |
1990 | This is consistent with other cursor motion functions | |
1991 | and makes it possible to use `vertical-motion' in any buffer, | |
1992 | whether or not it is currently displayed in some window. */) | |
5842a27b | 1993 | (Lisp_Object lines, Lisp_Object window) |
993b6404 | 1994 | { |
8720a429 GM |
1995 | struct it it; |
1996 | struct text_pos pt; | |
8720a429 | 1997 | struct window *w; |
39210e90 GM |
1998 | Lisp_Object old_buffer; |
1999 | struct gcpro gcpro1; | |
baed8445 SM |
2000 | Lisp_Object lcols = Qnil; |
2001 | double cols; | |
c876b227 SM |
2002 | |
2003 | /* Allow LINES to be of the form (HPOS . VPOS) aka (COLUMNS . LINES). */ | |
2004 | if (CONSP (lines) && (NUMBERP (XCAR (lines)))) | |
2005 | { | |
baed8445 SM |
2006 | lcols = XCAR (lines); |
2007 | cols = INTEGERP (lcols) ? (double) XINT (lcols) : XFLOAT_DATA (lcols); | |
c876b227 SM |
2008 | lines = XCDR (lines); |
2009 | } | |
993b6404 | 2010 | |
b7826503 | 2011 | CHECK_NUMBER (lines); |
f1ecfe9b | 2012 | if (! NILP (window)) |
b7826503 | 2013 | CHECK_WINDOW (window); |
f1ecfe9b | 2014 | else |
92992c7e | 2015 | window = selected_window; |
8720a429 | 2016 | w = XWINDOW (window); |
39210e90 GM |
2017 | |
2018 | old_buffer = Qnil; | |
2019 | GCPRO1 (old_buffer); | |
2020 | if (XBUFFER (w->buffer) != current_buffer) | |
8720a429 | 2021 | { |
39210e90 GM |
2022 | /* Set the window's buffer temporarily to the current buffer. */ |
2023 | old_buffer = w->buffer; | |
2024 | XSETBUFFER (w->buffer, current_buffer); | |
8720a429 | 2025 | } |
097812fb | 2026 | |
6df71429 | 2027 | if (noninteractive) |
9305b0e7 | 2028 | { |
6df71429 RS |
2029 | struct position pos; |
2030 | pos = *vmotion (PT, XINT (lines), w); | |
2031 | SET_PT_BOTH (pos.bufpos, pos.bytepos); | |
9305b0e7 KS |
2032 | } |
2033 | else | |
6df71429 | 2034 | { |
af2be002 | 2035 | int it_start, first_x, it_overshoot_expected; |
24a06d04 | 2036 | |
6df71429 RS |
2037 | SET_TEXT_POS (pt, PT, PT_BYTE); |
2038 | start_display (&it, w, pt); | |
2f4ec7ce | 2039 | first_x = it.first_visible_x; |
24a06d04 | 2040 | it_start = IT_CHARPOS (it); |
14a7cabf | 2041 | |
48cdfb4b CY |
2042 | /* See comments below for why we calculate this. */ |
2043 | if (XINT (lines) > 0) | |
14a7cabf | 2044 | { |
d6721dda KH |
2045 | if (it.cmp_it.id >= 0) |
2046 | it_overshoot_expected = 1; | |
187bc86f | 2047 | else if (it.method == GET_FROM_STRING) |
48cdfb4b | 2048 | { |
42a5b22f | 2049 | const char *s = SSDATA (it.string); |
48cdfb4b CY |
2050 | const char *e = s + SBYTES (it.string); |
2051 | while (s < e && *s != '\n') | |
2052 | ++s; | |
2053 | it_overshoot_expected = (s == e) ? -1 : 0; | |
2054 | } | |
2055 | else | |
2056 | it_overshoot_expected = (it.method == GET_FROM_IMAGE | |
d6721dda | 2057 | || it.method == GET_FROM_STRETCH); |
14a7cabf | 2058 | } |
14a7cabf | 2059 | |
48cdfb4b CY |
2060 | /* Scan from the start of the line containing PT. If we don't |
2061 | do this, we start moving with IT->current_x == 0, while PT is | |
2062 | really at some x > 0. */ | |
b54a7539 KS |
2063 | reseat_at_previous_visible_line_start (&it); |
2064 | it.current_x = it.hpos = 0; | |
af2be002 | 2065 | if (IT_CHARPOS (it) != PT) |
11fb10de CY |
2066 | /* We used to temporarily disable selective display here; the |
2067 | comment said this is "so we don't move too far" (2005-01-19 | |
2068 | checkin by kfs). But this does nothing useful that I can | |
2069 | tell, and it causes Bug#2694 . -- cyd */ | |
2070 | move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS); | |
b54a7539 | 2071 | |
48cdfb4b | 2072 | if (XINT (lines) <= 0) |
72ad106b | 2073 | { |
48cdfb4b CY |
2074 | it.vpos = 0; |
2075 | /* Do this even if LINES is 0, so that we move back to the | |
2076 | beginning of the current line as we ought. */ | |
2077 | if (XINT (lines) == 0 || IT_CHARPOS (it) > 0) | |
2078 | move_it_by_lines (&it, XINT (lines), 0); | |
2079 | } | |
2080 | else | |
2081 | { | |
2421af7e | 2082 | if (IT_CHARPOS (it) > it_start) |
48cdfb4b CY |
2083 | { |
2084 | /* IT may move too far if truncate-lines is on and PT | |
2085 | lies beyond the right margin. In that case, | |
2086 | backtrack unless the starting point is on an image, | |
2087 | stretch glyph, composition, or Lisp string. */ | |
2088 | if (!it_overshoot_expected | |
2089 | /* Also, backtrack if the Lisp string contains no | |
2090 | newline, but there is a newline right after it. | |
2091 | In this case, IT overshoots if there is an | |
2092 | after-string just before the newline. */ | |
2093 | || (it_overshoot_expected < 0 | |
2094 | && it.method == GET_FROM_BUFFER | |
2095 | && it.c == '\n')) | |
2096 | move_it_by_lines (&it, -1, 0); | |
2097 | it.vpos = 0; | |
2098 | move_it_by_lines (&it, XINT (lines), 0); | |
2099 | } | |
2100 | else | |
2101 | { | |
2102 | /* Otherwise, we are at the first row occupied by PT, | |
2103 | which might span multiple screen lines (e.g., if it's | |
2104 | on a multi-line display string). We want to start | |
2105 | from the last line that it occupies. */ | |
051facec | 2106 | if (it_start < ZV) |
48cdfb4b | 2107 | { |
2421af7e | 2108 | while (IT_CHARPOS (it) <= it_start) |
d8a7e7fc CY |
2109 | { |
2110 | it.vpos = 0; | |
2111 | move_it_by_lines (&it, 1, 0); | |
2112 | } | |
2113 | if (XINT (lines) > 1) | |
2114 | move_it_by_lines (&it, XINT (lines) - 1, 0); | |
48cdfb4b CY |
2115 | } |
2116 | else | |
d8a7e7fc CY |
2117 | { |
2118 | it.vpos = 0; | |
2119 | move_it_by_lines (&it, XINT (lines), 0); | |
2120 | } | |
48cdfb4b | 2121 | } |
72ad106b | 2122 | } |
097812fb | 2123 | |
2f4ec7ce | 2124 | /* Move to the goal column, if one was specified. */ |
baed8445 | 2125 | if (!NILP (lcols)) |
2f4ec7ce CY |
2126 | { |
2127 | /* If the window was originally hscrolled, move forward by | |
2128 | the hscrolled amount first. */ | |
2129 | if (first_x > 0) | |
2130 | { | |
2131 | move_it_in_display_line (&it, ZV, first_x, MOVE_TO_X); | |
2132 | it.current_x = 0; | |
2133 | } | |
2134 | move_it_in_display_line | |
2135 | (&it, ZV, | |
2136 | (int)(cols * FRAME_COLUMN_WIDTH (XFRAME (w->frame)) + 0.5), | |
2137 | MOVE_TO_X); | |
2138 | } | |
c876b227 | 2139 | |
6df71429 RS |
2140 | SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it)); |
2141 | } | |
8720a429 | 2142 | |
39210e90 GM |
2143 | if (BUFFERP (old_buffer)) |
2144 | w->buffer = old_buffer; | |
097812fb | 2145 | |
39210e90 | 2146 | RETURN_UNGCPRO (make_number (it.vpos)); |
993b6404 | 2147 | } |
8720a429 GM |
2148 | |
2149 | ||
993b6404 | 2150 | \f |
88c6e37e | 2151 | /* File's initialization. */ |
0aa01123 | 2152 | |
dfcf069d | 2153 | void |
971de7fb | 2154 | syms_of_indent (void) |
993b6404 | 2155 | { |
29208e82 | 2156 | DEFVAR_BOOL ("indent-tabs-mode", indent_tabs_mode, |
c86f7377 | 2157 | doc: /* *Indentation can insert tabs if this is non-nil. */); |
993b6404 JB |
2158 | indent_tabs_mode = 1; |
2159 | ||
2160 | defsubr (&Scurrent_indentation); | |
2161 | defsubr (&Sindent_to); | |
2162 | defsubr (&Scurrent_column); | |
2163 | defsubr (&Smove_to_column); | |
2164 | defsubr (&Svertical_motion); | |
42918ba5 | 2165 | defsubr (&Scompute_motion); |
993b6404 | 2166 | } |