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 | |
7831777b | 48 | static EMACS_INT 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 | |
7831777b PE |
58 | static EMACS_INT current_column_1 (void); |
59 | static EMACS_INT 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 | ||
4b4deea2 | 73 | thisbuf = BVAR (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))) |
77b37c05 | 96 | return ASIZE (elt); |
0aa01123 | 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 | ||
eab3844f | 124 | if (widthtab->header.size != 256) |
0aa01123 JB |
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 | |
4b4deea2 TT |
143 | if (!VECTORP (BVAR (buf, width_table))) |
144 | BVAR (buf, width_table) = Fmake_vector (make_number (256), make_number (0)); | |
145 | widthtab = XVECTOR (BVAR (buf, width_table)); | |
eab3844f | 146 | if (widthtab->header.size != 256) |
0aa01123 JB |
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 | { |
4b4deea2 | 159 | if (NILP (BVAR (current_buffer, cache_long_line_scans)) |
a997a7ca KH |
160 | /* And, for the moment, this feature doesn't work on multibyte |
161 | characters. */ | |
4b4deea2 | 162 | || !NILP (BVAR (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; | |
4b4deea2 | 169 | BVAR (current_buffer, width_table) = Qnil; |
0aa01123 JB |
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 | ||
c59478bc | 274 | This macro is used in scan_for_column and in |
c9c0f7cf KH |
275 | compute_motion. */ |
276 | ||
85f24f61 | 277 | #define MULTIBYTE_BYTES_WIDTH(p, dp, bytes, width) \ |
012fd715 | 278 | do { \ |
85f24f61 | 279 | int ch; \ |
012fd715 | 280 | \ |
85f24f61 | 281 | ch = STRING_CHAR_AND_LENGTH (p, bytes); \ |
012fd715 KH |
282 | if (BYTES_BY_CHAR_HEAD (*p) != bytes) \ |
283 | width = bytes * 4; \ | |
284 | else \ | |
285 | { \ | |
85f24f61 | 286 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, ch))) \ |
77b37c05 | 287 | width = ASIZE (DISP_CHAR_VECTOR (dp, ch)); \ |
012fd715 | 288 | else \ |
85f24f61 | 289 | width = CHAR_WIDTH (ch); \ |
012fd715 | 290 | } \ |
c9c0f7cf KH |
291 | } while (0) |
292 | ||
097812fb | 293 | |
993b6404 | 294 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, |
8c1a1077 PJ |
295 | doc: /* Return the horizontal position of point. Beginning of line is column 0. |
296 | This is calculated by adding together the widths of all the displayed | |
297 | representations of the character between the start of the previous line | |
7bf120f1 JB |
298 | and point (eg. control characters will have a width of 2 or 4, tabs |
299 | will have a variable width). | |
8c1a1077 PJ |
300 | Ignores finite width of frame, which means that this function may return |
301 | values greater than (frame-width). | |
302 | Whether the line is visible (if `selective-display' is t) has no effect; | |
e01732fa SM |
303 | however, ^M is treated as end of line when `selective-display' is t. |
304 | Text that has an invisible property is considered as having width 0, unless | |
305 | `buffer-invisibility-spec' specifies that it is replaced by an ellipsis. */) | |
5842a27b | 306 | (void) |
993b6404 JB |
307 | { |
308 | Lisp_Object temp; | |
7831777b | 309 | XSETFASTINT (temp, current_column ()); |
993b6404 JB |
310 | return temp; |
311 | } | |
312 | ||
e74928fc JB |
313 | /* Cancel any recorded value of the horizontal position. */ |
314 | ||
c9667ae1 | 315 | void |
971de7fb | 316 | invalidate_current_column (void) |
e74928fc JB |
317 | { |
318 | last_known_column_point = 0; | |
319 | } | |
320 | ||
53b2623d PE |
321 | /* Return a non-outlandish value for the tab width. */ |
322 | ||
323 | static int | |
324 | sane_tab_width (void) | |
325 | { | |
326 | EMACS_INT n = XFASTINT (BVAR (current_buffer, tab_width)); | |
327 | return 0 < n && n <= 1000 ? n : 8; | |
328 | } | |
329 | ||
7831777b | 330 | EMACS_INT |
971de7fb | 331 | current_column (void) |
993b6404 | 332 | { |
7831777b | 333 | register EMACS_INT col; |
993b6404 JB |
334 | register unsigned char *ptr, *stop; |
335 | register int tab_seen; | |
7831777b | 336 | EMACS_INT post_tab; |
993b6404 | 337 | register int c; |
53b2623d | 338 | int tab_width = sane_tab_width (); |
4b4deea2 | 339 | int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow)); |
d44f12b4 | 340 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
993b6404 | 341 | |
6ec8bbd2 | 342 | if (PT == last_known_column_point |
993b6404 JB |
343 | && MODIFF == last_known_column_modified) |
344 | return last_known_column; | |
345 | ||
813b81b3 RS |
346 | /* If the buffer has overlays, text properties, |
347 | or multibyte characters, use a more general algorithm. */ | |
9a21bb64 | 348 | if (BUF_INTERVALS (current_buffer) |
3ea2f6f3 SM |
349 | || current_buffer->overlays_before |
350 | || current_buffer->overlays_after | |
813b81b3 RS |
351 | || Z != Z_BYTE) |
352 | return current_column_1 (); | |
9a21bb64 RS |
353 | |
354 | /* Scan backwards from point to the previous newline, | |
355 | counting width. Tab characters are the only complicated case. */ | |
356 | ||
993b6404 | 357 | /* Make a pointer for decrementing through the chars before point. */ |
fe0066f5 | 358 | ptr = BYTE_POS_ADDR (PT_BYTE - 1) + 1; |
993b6404 JB |
359 | /* Make a pointer to where consecutive chars leave off, |
360 | going backwards from point. */ | |
6ec8bbd2 | 361 | if (PT == BEGV) |
993b6404 | 362 | stop = ptr; |
6ec8bbd2 | 363 | else if (PT <= GPT || BEGV > GPT) |
993b6404 JB |
364 | stop = BEGV_ADDR; |
365 | else | |
366 | stop = GAP_END_ADDR; | |
367 | ||
993b6404 JB |
368 | col = 0, tab_seen = 0, post_tab = 0; |
369 | ||
370 | while (1) | |
371 | { | |
88c6e37e GM |
372 | EMACS_INT i, n; |
373 | Lisp_Object charvec; | |
097812fb | 374 | |
993b6404 JB |
375 | if (ptr == stop) |
376 | { | |
377 | /* We stopped either for the beginning of the buffer | |
378 | or for the gap. */ | |
379 | if (ptr == BEGV_ADDR) | |
380 | break; | |
097812fb | 381 | |
993b6404 JB |
382 | /* It was the gap. Jump back over it. */ |
383 | stop = BEGV_ADDR; | |
384 | ptr = GPT_ADDR; | |
097812fb | 385 | |
993b6404 | 386 | /* Check whether that brings us to beginning of buffer. */ |
88c6e37e GM |
387 | if (BEGV >= GPT) |
388 | break; | |
993b6404 JB |
389 | } |
390 | ||
391 | c = *--ptr; | |
097812fb | 392 | |
88c6e37e | 393 | if (dp && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
7050d530 | 394 | { |
88c6e37e GM |
395 | charvec = DISP_CHAR_VECTOR (dp, c); |
396 | n = ASIZE (charvec); | |
7050d530 | 397 | } |
88c6e37e | 398 | else |
993b6404 | 399 | { |
88c6e37e GM |
400 | charvec = Qnil; |
401 | n = 1; | |
402 | } | |
097812fb | 403 | |
88c6e37e GM |
404 | for (i = n - 1; i >= 0; --i) |
405 | { | |
406 | if (VECTORP (charvec)) | |
407 | { | |
408 | /* This should be handled the same as | |
409 | next_element_from_display_vector does it. */ | |
410 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 411 | |
f59836fe KS |
412 | if (GLYPH_CODE_P (entry) |
413 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
414 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
415 | else |
416 | c = ' '; | |
417 | } | |
097812fb | 418 | |
88c6e37e GM |
419 | if (c >= 040 && c < 0177) |
420 | col++; | |
421 | else if (c == '\n' | |
422 | || (c == '\r' | |
4b4deea2 | 423 | && EQ (BVAR (current_buffer, selective_display), Qt))) |
88c6e37e GM |
424 | { |
425 | ptr++; | |
426 | goto start_of_line_found; | |
427 | } | |
428 | else if (c == '\t') | |
429 | { | |
430 | if (tab_seen) | |
431 | col = ((col + tab_width) / tab_width) * tab_width; | |
097812fb | 432 | |
88c6e37e GM |
433 | post_tab += col; |
434 | col = 0; | |
435 | tab_seen = 1; | |
436 | } | |
f1004faf GM |
437 | else if (VECTORP (charvec)) |
438 | /* With a display table entry, C is displayed as is, and | |
439 | not displayed as \NNN or as ^N. If C is a single-byte | |
440 | character, it takes one column. If C is multi-byte in | |
441 | an unibyte buffer, it's translated to unibyte, so it | |
442 | also takes one column. */ | |
443 | ++col; | |
88c6e37e GM |
444 | else |
445 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
993b6404 | 446 | } |
993b6404 JB |
447 | } |
448 | ||
88c6e37e GM |
449 | start_of_line_found: |
450 | ||
993b6404 JB |
451 | if (tab_seen) |
452 | { | |
453 | col = ((col + tab_width) / tab_width) * tab_width; | |
454 | col += post_tab; | |
455 | } | |
456 | ||
a997a7ca KH |
457 | if (ptr == BEGV_ADDR) |
458 | current_column_bol_cache = BEGV; | |
459 | else | |
fe0066f5 RS |
460 | current_column_bol_cache = BYTE_TO_CHAR (PTR_BYTE_POS (ptr)); |
461 | ||
993b6404 | 462 | last_known_column = col; |
6ec8bbd2 | 463 | last_known_column_point = PT; |
993b6404 JB |
464 | last_known_column_modified = MODIFF; |
465 | ||
466 | return col; | |
467 | } | |
468 | \f | |
80e3db56 SM |
469 | |
470 | /* Check the presence of a display property and compute its width. | |
471 | If a property was found and its width was found as well, return | |
472 | its width (>= 0) and set the position of the end of the property | |
473 | in ENDPOS. | |
474 | Otherwise just return -1. */ | |
475 | static int | |
476 | check_display_width (EMACS_INT pos, EMACS_INT col, EMACS_INT *endpos) | |
477 | { | |
478 | Lisp_Object val, overlay; | |
479 | ||
480 | if (CONSP (val = get_char_property_and_overlay | |
481 | (make_number (pos), Qdisplay, Qnil, &overlay)) | |
482 | && EQ (Qspace, XCAR (val))) | |
483 | { /* FIXME: Use calc_pixel_width_or_height, as in term.c. */ | |
484 | Lisp_Object plist = XCDR (val), prop; | |
485 | int width = -1; | |
486 | ||
487 | if ((prop = Fplist_get (plist, QCwidth), NATNUMP (prop))) | |
488 | width = XINT (prop); | |
489 | else if (FLOATP (prop)) | |
490 | width = (int)(XFLOAT_DATA (prop) + 0.5); | |
491 | else if ((prop = Fplist_get (plist, QCalign_to), NATNUMP (prop))) | |
492 | width = XINT (prop) - col; | |
493 | else if (FLOATP (prop)) | |
494 | width = (int)(XFLOAT_DATA (prop) + 0.5) - col; | |
409f2919 | 495 | |
80e3db56 SM |
496 | if (width >= 0) |
497 | { | |
498 | EMACS_INT start; | |
499 | if (OVERLAYP (overlay)) | |
500 | *endpos = OVERLAY_POSITION (OVERLAY_END (overlay)); | |
501 | else | |
502 | get_property_and_range (pos, Qdisplay, &val, &start, endpos, Qnil); | |
503 | return width; | |
504 | } | |
505 | } | |
506 | return -1; | |
507 | } | |
508 | ||
ef6f5c0e SM |
509 | /* Scanning from the beginning of the current line, stop at the buffer |
510 | position ENDPOS or at the column GOALCOL or at the end of line, whichever | |
511 | comes first. | |
512 | Return the resulting buffer position and column in ENDPOS and GOALCOL. | |
513 | PREVCOL gets set to the column of the previous position (it's always | |
514 | strictly smaller than the goal column). */ | |
515 | static void | |
516 | scan_for_column (EMACS_INT *endpos, EMACS_INT *goalcol, EMACS_INT *prevcol) | |
9a21bb64 | 517 | { |
53b2623d | 518 | int tab_width = sane_tab_width (); |
4b4deea2 | 519 | register int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow)); |
9a21bb64 | 520 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
4b4deea2 | 521 | int multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters)); |
d6721dda | 522 | struct composition_it cmp_it; |
fc88345b KH |
523 | Lisp_Object window; |
524 | struct window *w; | |
9a21bb64 RS |
525 | |
526 | /* Start the scan at the beginning of this line with column number 0. */ | |
ef6f5c0e SM |
527 | register EMACS_INT col = 0, prev_col = 0; |
528 | EMACS_INT goal = goalcol ? *goalcol : MOST_POSITIVE_FIXNUM; | |
529 | EMACS_INT end = endpos ? *endpos : PT; | |
83155776 SM |
530 | EMACS_INT scan, scan_byte; |
531 | EMACS_INT next_boundary; | |
ef6f5c0e | 532 | { |
83155776 | 533 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
813b81b3 | 534 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); |
fe0066f5 RS |
535 | current_column_bol_cache = PT; |
536 | scan = PT, scan_byte = PT_BYTE; | |
537 | SET_PT_BOTH (opoint, opoint_byte); | |
538 | next_boundary = scan; | |
ef6f5c0e | 539 | } |
9a21bb64 | 540 | |
fc88345b KH |
541 | window = Fget_buffer_window (Fcurrent_buffer (), Qnil); |
542 | w = ! NILP (window) ? XWINDOW (window) : NULL; | |
543 | ||
72af86bd | 544 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
545 | cmp_it.id = -1; |
546 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, Qnil); | |
9a21bb64 RS |
547 | |
548 | /* Scan forward to the target position. */ | |
ef6f5c0e | 549 | while (scan < end) |
9a21bb64 RS |
550 | { |
551 | int c; | |
552 | ||
553 | /* Occasionally we may need to skip invisible text. */ | |
554 | while (scan == next_boundary) | |
555 | { | |
ef6f5c0e | 556 | EMACS_INT old_scan = scan; |
9a21bb64 RS |
557 | /* This updates NEXT_BOUNDARY to the next place |
558 | where we might need to skip more invisible text. */ | |
ef6f5c0e | 559 | scan = skip_invisible (scan, &next_boundary, end, Qnil); |
fe0066f5 RS |
560 | if (scan != old_scan) |
561 | scan_byte = CHAR_TO_BYTE (scan); | |
ef6f5c0e SM |
562 | if (scan >= end) |
563 | goto endloop; | |
9a21bb64 RS |
564 | } |
565 | ||
ef6f5c0e SM |
566 | /* Test reaching the goal column. We do this after skipping |
567 | invisible characters, so that we put point before the | |
568 | character on which the cursor will appear. */ | |
569 | if (col >= goal) | |
570 | break; | |
571 | prev_col = col; | |
572 | ||
80e3db56 | 573 | { /* Check display property. */ |
85f24f61 PE |
574 | EMACS_INT endp; |
575 | int width = check_display_width (scan, col, &endp); | |
80e3db56 SM |
576 | if (width >= 0) |
577 | { | |
578 | col += width; | |
85f24f61 | 579 | if (endp > scan) /* Avoid infinite loops with 0-width overlays. */ |
80e3db56 | 580 | { |
85f24f61 | 581 | scan = endp; scan_byte = charpos_to_bytepos (scan); |
80e3db56 SM |
582 | continue; |
583 | } | |
584 | } | |
585 | } | |
586 | ||
d6721dda KH |
587 | /* Check composition sequence. */ |
588 | if (cmp_it.id >= 0 | |
589 | || (scan == cmp_it.stop_pos | |
590 | && composition_reseat_it (&cmp_it, scan, scan_byte, end, | |
fc88345b | 591 | w, NULL, Qnil))) |
d6721dda KH |
592 | composition_update_it (&cmp_it, scan, scan_byte, Qnil); |
593 | if (cmp_it.id >= 0) | |
594 | { | |
595 | scan += cmp_it.nchars; | |
596 | scan_byte += cmp_it.nbytes; | |
597 | if (scan <= end) | |
598 | col += cmp_it.width; | |
599 | if (cmp_it.to == cmp_it.nglyphs) | |
600 | { | |
601 | cmp_it.id = -1; | |
602 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, | |
603 | Qnil); | |
604 | } | |
605 | else | |
606 | cmp_it.from = cmp_it.to; | |
607 | continue; | |
608 | } | |
609 | ||
813b81b3 | 610 | c = FETCH_BYTE (scan_byte); |
88c6e37e | 611 | |
ef6f5c0e SM |
612 | /* See if there is a display table and it relates |
613 | to this character. */ | |
614 | ||
c9c0f7cf | 615 | if (dp != 0 |
409f2919 | 616 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 617 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
9a21bb64 | 618 | { |
d6e483a4 RS |
619 | Lisp_Object charvec; |
620 | EMACS_INT i, n; | |
621 | ||
622 | /* This character is displayed using a vector of glyphs. | |
ef6f5c0e | 623 | Update the column/position based on those glyphs. */ |
d6e483a4 | 624 | |
88c6e37e GM |
625 | charvec = DISP_CHAR_VECTOR (dp, c); |
626 | n = ASIZE (charvec); | |
88c6e37e | 627 | |
d6e483a4 | 628 | for (i = 0; i < n; i++) |
88c6e37e GM |
629 | { |
630 | /* This should be handled the same as | |
631 | next_element_from_display_vector does it. */ | |
f59836fe | 632 | Lisp_Object entry = AREF (charvec, i); |
d6e483a4 | 633 | |
f59836fe KS |
634 | if (GLYPH_CODE_P (entry) |
635 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
636 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
637 | else |
638 | c = ' '; | |
d6e483a4 RS |
639 | |
640 | if (c == '\n') | |
641 | goto endloop; | |
4b4deea2 | 642 | if (c == '\r' && EQ (BVAR (current_buffer, selective_display), Qt)) |
d6e483a4 RS |
643 | goto endloop; |
644 | if (c == '\t') | |
645 | { | |
d6e483a4 RS |
646 | col += tab_width; |
647 | col = col / tab_width * tab_width; | |
648 | } | |
649 | else | |
650 | ++col; | |
88c6e37e | 651 | } |
d6e483a4 RS |
652 | } |
653 | else | |
654 | { | |
ef6f5c0e SM |
655 | /* The display table doesn't affect this character; |
656 | it displays as itself. */ | |
d6e483a4 | 657 | |
88c6e37e GM |
658 | if (c == '\n') |
659 | goto endloop; | |
4b4deea2 | 660 | if (c == '\r' && EQ (BVAR (current_buffer, selective_display), Qt)) |
88c6e37e | 661 | goto endloop; |
88c6e37e GM |
662 | if (c == '\t') |
663 | { | |
88c6e37e GM |
664 | col += tab_width; |
665 | col = col / tab_width * tab_width; | |
666 | } | |
409f2919 | 667 | else if (multibyte && LEADING_CODE_P (c)) |
88c6e37e | 668 | { |
ef6f5c0e | 669 | /* Start of multi-byte form. */ |
88c6e37e | 670 | unsigned char *ptr; |
c59478bc | 671 | int bytes, width; |
097812fb | 672 | |
88c6e37e | 673 | ptr = BYTE_POS_ADDR (scan_byte); |
85f24f61 | 674 | MULTIBYTE_BYTES_WIDTH (ptr, dp, bytes, width); |
36974b5e RS |
675 | /* Subtract one to compensate for the increment |
676 | that is going to happen below. */ | |
ef6f5c0e | 677 | scan_byte += bytes - 1; |
88c6e37e GM |
678 | col += width; |
679 | } | |
680 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
681 | col += 2; | |
682 | else if (c < 040 || c >= 0177) | |
683 | col += 4; | |
684 | else | |
685 | col++; | |
a997a7ca | 686 | } |
d6e483a4 RS |
687 | scan++; |
688 | scan_byte++; | |
689 | ||
9a21bb64 RS |
690 | } |
691 | endloop: | |
692 | ||
693 | last_known_column = col; | |
6ec8bbd2 | 694 | last_known_column_point = PT; |
9a21bb64 RS |
695 | last_known_column_modified = MODIFF; |
696 | ||
ef6f5c0e SM |
697 | if (goalcol) |
698 | *goalcol = col; | |
699 | if (endpos) | |
700 | *endpos = scan; | |
701 | if (prevcol) | |
702 | *prevcol = prev_col; | |
703 | } | |
704 | ||
705 | /* Return the column number of position POS | |
706 | by scanning forward from the beginning of the line. | |
707 | This function handles characters that are invisible | |
708 | due to text properties or overlays. */ | |
709 | ||
7831777b | 710 | static EMACS_INT |
971de7fb | 711 | current_column_1 (void) |
ef6f5c0e SM |
712 | { |
713 | EMACS_INT col = MOST_POSITIVE_FIXNUM; | |
714 | EMACS_INT opoint = PT; | |
715 | ||
716 | scan_for_column (&opoint, &col, NULL); | |
9a21bb64 RS |
717 | return col; |
718 | } | |
719 | \f | |
f4a6687d GM |
720 | |
721 | #if 0 /* Not used. */ | |
722 | ||
c412c808 RS |
723 | /* Return the width in columns of the part of STRING from BEG to END. |
724 | If BEG is nil, that stands for the beginning of STRING. | |
725 | If END is nil, that stands for the end of STRING. */ | |
726 | ||
76e20cb0 | 727 | static double |
382ac0bd | 728 | string_display_width (string, beg, end) |
c412c808 RS |
729 | Lisp_Object string, beg, end; |
730 | { | |
731 | register int col; | |
732 | register unsigned char *ptr, *stop; | |
733 | register int tab_seen; | |
734 | int post_tab; | |
735 | register int c; | |
53b2623d | 736 | int tab_width = sane_tab_width (); |
c412c808 | 737 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 738 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
c412c808 RS |
739 | int b, e; |
740 | ||
741 | if (NILP (end)) | |
d5db4077 | 742 | e = SCHARS (string); |
c412c808 RS |
743 | else |
744 | { | |
b7826503 | 745 | CHECK_NUMBER (end); |
c412c808 RS |
746 | e = XINT (end); |
747 | } | |
748 | ||
749 | if (NILP (beg)) | |
750 | b = 0; | |
751 | else | |
752 | { | |
b7826503 | 753 | CHECK_NUMBER (beg); |
c412c808 RS |
754 | b = XINT (beg); |
755 | } | |
756 | ||
757 | /* Make a pointer for decrementing through the chars before point. */ | |
d5db4077 | 758 | ptr = SDATA (string) + e; |
c412c808 RS |
759 | /* Make a pointer to where consecutive chars leave off, |
760 | going backwards from point. */ | |
d5db4077 | 761 | stop = SDATA (string) + b; |
c412c808 | 762 | |
c412c808 RS |
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))) | |
77b37c05 | 772 | col += ASIZE (DISP_CHAR_VECTOR (dp, c)); |
c412c808 RS |
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 |
a7ca3326 | 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 | 809 | { |
7831777b PE |
810 | EMACS_INT mincol; |
811 | register EMACS_INT fromcol; | |
53b2623d | 812 | int tab_width = sane_tab_width (); |
993b6404 | 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 | ||
993b6404 JB |
826 | if (indent_tabs_mode) |
827 | { | |
828 | Lisp_Object n; | |
94d92e9c | 829 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
830 | if (XFASTINT (n) != 0) |
831 | { | |
6d1bd1a5 | 832 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
833 | |
834 | fromcol = (mincol / tab_width) * tab_width; | |
835 | } | |
836 | } | |
837 | ||
04c98432 EN |
838 | XSETFASTINT (column, mincol - fromcol); |
839 | Finsert_char (make_number (' '), column, Qt); | |
993b6404 JB |
840 | |
841 | last_known_column = mincol; | |
6ec8bbd2 | 842 | last_known_column_point = PT; |
993b6404 JB |
843 | last_known_column_modified = MODIFF; |
844 | ||
04c98432 EN |
845 | XSETINT (column, mincol); |
846 | return column; | |
993b6404 | 847 | } |
0aa01123 | 848 | |
993b6404 JB |
849 | \f |
850 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, | |
8c1a1077 PJ |
851 | 0, 0, 0, |
852 | doc: /* Return the indentation of the current line. | |
853 | This is the horizontal position of the character | |
854 | following any initial whitespace. */) | |
5842a27b | 855 | (void) |
993b6404 JB |
856 | { |
857 | Lisp_Object val; | |
5816888b | 858 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
fe0066f5 RS |
859 | |
860 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); | |
993b6404 | 861 | |
7831777b | 862 | XSETFASTINT (val, position_indentation (PT_BYTE)); |
fe0066f5 | 863 | SET_PT_BOTH (opoint, opoint_byte); |
993b6404 JB |
864 | return val; |
865 | } | |
866 | ||
7831777b | 867 | static EMACS_INT |
971de7fb | 868 | position_indentation (register int pos_byte) |
993b6404 | 869 | { |
83155776 | 870 | register EMACS_INT column = 0; |
53b2623d | 871 | int tab_width = sane_tab_width (); |
993b6404 JB |
872 | register unsigned char *p; |
873 | register unsigned char *stop; | |
9a21bb64 | 874 | unsigned char *start; |
83155776 SM |
875 | EMACS_INT next_boundary_byte = pos_byte; |
876 | EMACS_INT ceiling = next_boundary_byte; | |
2ff4775b | 877 | |
fe0066f5 | 878 | p = BYTE_POS_ADDR (pos_byte); |
9a21bb64 RS |
879 | /* STOP records the value of P at which we will need |
880 | to think about the gap, or about invisible text, | |
881 | or about the end of the buffer. */ | |
882 | stop = p; | |
883 | /* START records the starting value of P. */ | |
884 | start = p; | |
993b6404 JB |
885 | while (1) |
886 | { | |
887 | while (p == stop) | |
888 | { | |
83155776 | 889 | EMACS_INT stop_pos_byte; |
9a21bb64 | 890 | |
fe0066f5 RS |
891 | /* If we have updated P, set POS_BYTE to match. |
892 | The first time we enter the loop, POS_BYTE is already right. */ | |
9a21bb64 | 893 | if (p != start) |
fe0066f5 | 894 | pos_byte = PTR_BYTE_POS (p); |
9a21bb64 | 895 | /* Consider the various reasons STOP might have been set here. */ |
fe0066f5 | 896 | if (pos_byte == ZV_BYTE) |
993b6404 | 897 | return column; |
fe0066f5 RS |
898 | if (pos_byte == next_boundary_byte) |
899 | { | |
83155776 SM |
900 | EMACS_INT next_boundary; |
901 | EMACS_INT pos = BYTE_TO_CHAR (pos_byte); | |
fe0066f5 RS |
902 | pos = skip_invisible (pos, &next_boundary, ZV, Qnil); |
903 | pos_byte = CHAR_TO_BYTE (pos); | |
904 | next_boundary_byte = CHAR_TO_BYTE (next_boundary); | |
905 | } | |
906 | if (pos_byte >= ceiling) | |
907 | ceiling = BUFFER_CEILING_OF (pos_byte) + 1; | |
9a21bb64 RS |
908 | /* Compute the next place we need to stop and think, |
909 | and set STOP accordingly. */ | |
fe0066f5 | 910 | stop_pos_byte = min (ceiling, next_boundary_byte); |
9a21bb64 | 911 | /* The -1 and +1 arrange to point at the first byte of gap |
fe0066f5 | 912 | (if STOP_POS_BYTE is the position of the gap) |
9a21bb64 | 913 | rather than at the data after the gap. */ |
097812fb | 914 | |
fe0066f5 RS |
915 | stop = BYTE_POS_ADDR (stop_pos_byte - 1) + 1; |
916 | p = BYTE_POS_ADDR (pos_byte); | |
993b6404 JB |
917 | } |
918 | switch (*p++) | |
919 | { | |
fb911777 | 920 | case 0240: |
4b4deea2 | 921 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
fb911777 | 922 | return column; |
993b6404 JB |
923 | case ' ': |
924 | column++; | |
925 | break; | |
926 | case '\t': | |
927 | column += tab_width - column % tab_width; | |
928 | break; | |
929 | default: | |
fb911777 | 930 | if (ASCII_BYTE_P (p[-1]) |
4b4deea2 | 931 | || NILP (BVAR (current_buffer, enable_multibyte_characters))) |
fb911777 KH |
932 | return column; |
933 | { | |
fe0066f5 RS |
934 | int c; |
935 | pos_byte = PTR_BYTE_POS (p - 1); | |
936 | c = FETCH_MULTIBYTE_CHAR (pos_byte); | |
fb911777 KH |
937 | if (CHAR_HAS_CATEGORY (c, ' ')) |
938 | { | |
939 | column++; | |
fe0066f5 RS |
940 | INC_POS (pos_byte); |
941 | p = BYTE_POS_ADDR (pos_byte); | |
fb911777 KH |
942 | } |
943 | else | |
944 | return column; | |
945 | } | |
993b6404 JB |
946 | } |
947 | } | |
948 | } | |
1b15e576 KH |
949 | |
950 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
951 | Blank lines are treated as if they had the same indentation as the | |
952 | preceding line. */ | |
fe0066f5 | 953 | |
1b15e576 | 954 | int |
7831777b | 955 | indented_beyond_p (EMACS_INT pos, EMACS_INT pos_byte, EMACS_INT column) |
1b15e576 | 956 | { |
7831777b | 957 | EMACS_INT val; |
5816888b | 958 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
fe0066f5 RS |
959 | |
960 | SET_PT_BOTH (pos, pos_byte); | |
961 | while (PT > BEGV && FETCH_BYTE (PT_BYTE) == '\n') | |
962 | scan_newline (PT - 1, PT_BYTE - 1, BEGV, BEGV_BYTE, -1, 0); | |
963 | ||
d5d6f706 | 964 | val = position_indentation (PT_BYTE); |
fe0066f5 | 965 | SET_PT_BOTH (opoint, opoint_byte); |
7831777b | 966 | return val >= column; |
1b15e576 | 967 | } |
993b6404 | 968 | \f |
a7ca3326 | 969 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, "p", |
8c1a1077 | 970 | doc: /* Move point to column COLUMN in the current line. |
3c860543 | 971 | Interactively, COLUMN is the value of prefix numeric argument. |
8c1a1077 PJ |
972 | The column of a character is calculated by adding together the widths |
973 | as displayed of the previous characters in the line. | |
974 | This function ignores line-continuation; | |
975 | there is no upper limit on the column number a character can have | |
976 | and horizontal scrolling has no effect. | |
977 | ||
978 | If specified column is within a character, point goes after that character. | |
979 | If it's past end of line, point goes to end of line. | |
980 | ||
3c860543 EZ |
981 | Optional second argument FORCE non-nil means if COLUMN is in the |
982 | middle of a tab character, change it to spaces. | |
983 | In addition, if FORCE is t, and the line is too short to reach | |
984 | COLUMN, add spaces/tabs to get there. | |
8c1a1077 PJ |
985 | |
986 | The return value is the current column. */) | |
5842a27b | 987 | (Lisp_Object column, Lisp_Object force) |
993b6404 | 988 | { |
ef6f5c0e SM |
989 | EMACS_INT pos; |
990 | EMACS_INT col, prev_col; | |
991 | EMACS_INT goal; | |
fe0066f5 | 992 | |
b7826503 | 993 | CHECK_NATNUM (column); |
993b6404 JB |
994 | goal = XINT (column); |
995 | ||
ef6f5c0e SM |
996 | col = goal; |
997 | pos = ZV; | |
998 | scan_for_column (&pos, &col, &prev_col); | |
993b6404 | 999 | |
ef6f5c0e | 1000 | SET_PT (pos); |
4c669c09 | 1001 | |
ef6f5c0e SM |
1002 | /* If a tab char made us overshoot, change it to spaces |
1003 | and scan through it again. */ | |
1004 | if (!NILP (force) && col > goal) | |
993b6404 | 1005 | { |
4c92f429 | 1006 | int c; |
ef6f5c0e | 1007 | EMACS_INT pos_byte = PT_BYTE; |
d6e483a4 | 1008 | |
4c92f429 AS |
1009 | DEC_POS (pos_byte); |
1010 | c = FETCH_CHAR (pos_byte); | |
ef6f5c0e | 1011 | if (c == '\t' && prev_col < goal) |
d6e483a4 | 1012 | { |
ef6f5c0e SM |
1013 | EMACS_INT goal_pt, goal_pt_byte; |
1014 | ||
1015 | /* Insert spaces in front of the tab to reach GOAL. Do this | |
1016 | first so that a marker at the end of the tab gets | |
1017 | adjusted. */ | |
1018 | SET_PT_BOTH (PT - 1, PT_BYTE - 1); | |
1019 | Finsert_char (make_number (' '), make_number (goal - prev_col), Qt); | |
1020 | ||
1021 | /* Now delete the tab, and indent to COL. */ | |
1022 | del_range (PT, PT + 1); | |
1023 | goal_pt = PT; | |
1024 | goal_pt_byte = PT_BYTE; | |
1025 | Findent_to (make_number (col), Qnil); | |
1026 | SET_PT_BOTH (goal_pt, goal_pt_byte); | |
1027 | ||
1028 | /* Set the last_known... vars consistently. */ | |
1029 | col = goal; | |
a997a7ca | 1030 | } |
993b6404 JB |
1031 | } |
1032 | ||
1033 | /* If line ends prematurely, add space to the end. */ | |
de4075cf | 1034 | if (col < goal && EQ (force, Qt)) |
230a4cbd | 1035 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
1036 | |
1037 | last_known_column = col; | |
6ec8bbd2 | 1038 | last_known_column_point = PT; |
993b6404 JB |
1039 | last_known_column_modified = MODIFF; |
1040 | ||
ef6f5c0e | 1041 | return make_number (col); |
993b6404 JB |
1042 | } |
1043 | \f | |
0aa01123 JB |
1044 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
1045 | ||
9306c32e | 1046 | static struct position val_compute_motion; |
993b6404 JB |
1047 | |
1048 | /* Scan the current buffer forward from offset FROM, pretending that | |
1049 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
1050 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
1051 | and return the ending buffer position and screen location. If we |
1052 | can't hit the requested column exactly (because of a tab or other | |
1053 | multi-column character), overshoot. | |
993b6404 | 1054 | |
2ab90d49 KH |
1055 | DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings |
1056 | at FROM. This is the case if FROMVPOS and FROMVPOS came from an | |
1057 | earlier call to compute_motion. The other common case is that FROMHPOS | |
1058 | is zero and FROM is a position that "belongs" at column zero, but might | |
1059 | be shifted by overlay strings; in this case DID_MOTION should be 0. | |
1060 | ||
993b6404 JB |
1061 | WIDTH is the number of columns available to display text; |
1062 | compute_motion uses this to handle continuation lines and such. | |
361f14bf KS |
1063 | If WIDTH is -1, use width of window's text area adjusted for |
1064 | continuation glyph when needed. | |
1065 | ||
993b6404 JB |
1066 | HSCROLL is the number of columns not being displayed at the left |
1067 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
1068 | TAB_OFFSET is the number of columns of the first tab that aren't |
1069 | being displayed, perhaps because of a continuation line or | |
1070 | something. | |
993b6404 JB |
1071 | |
1072 | compute_motion returns a pointer to a struct position. The bufpos | |
1073 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
1074 | and vpos give its cartesian location. prevhpos is the column at |
1075 | which the character before bufpos started, and contin is non-zero | |
1076 | if we reached the current line by continuing the previous. | |
1077 | ||
1078 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
1079 | columns, taking HSCROLL and the truncation glyph at the left margin | |
1080 | into account. That is, beginning-of-line moves you to the hpos | |
1081 | -HSCROLL + (HSCROLL > 0). | |
993b6404 JB |
1082 | |
1083 | For example, to find the buffer position of column COL of line LINE | |
1084 | of a certain window, pass the window's starting location as FROM | |
1085 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
1086 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
1087 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
2ff4775b | 1088 | TOHPOS. |
993b6404 JB |
1089 | |
1090 | When displaying in window w, a typical formula for WIDTH is: | |
1091 | ||
1092 | window_width - 1 | |
a3c87d4e | 1093 | - (has_vertical_scroll_bars |
90022f5a KS |
1094 | ? WINDOW_CONFIG_SCROLL_BAR_COLS (window) |
1095 | : (window_width + window_left != frame_cols)) | |
993b6404 JB |
1096 | |
1097 | where | |
90022f5a KS |
1098 | window_width is XFASTINT (w->total_cols), |
1099 | window_left is XFASTINT (w->left_col), | |
a3c87d4e | 1100 | has_vertical_scroll_bars is |
90022f5a KS |
1101 | WINDOW_HAS_VERTICAL_SCROLL_BAR (window) |
1102 | and frame_cols = FRAME_COLS (XFRAME (window->frame)) | |
993b6404 | 1103 | |
abde8f8c MR |
1104 | Or you can let window_body_cols do this all for you, and write: |
1105 | window_body_cols (w) - 1 | |
fa61c701 JB |
1106 | |
1107 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 1108 | accounts for window borders if the window is split horizontally, and |
1827d036 | 1109 | the scroll bars if they are turned on. */ |
993b6404 JB |
1110 | |
1111 | struct position * | |
971de7fb | 1112 | 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 | 1113 | { |
83155776 SM |
1114 | register EMACS_INT hpos = fromhpos; |
1115 | register EMACS_INT vpos = fromvpos; | |
cde9337b | 1116 | |
83155776 SM |
1117 | register EMACS_INT pos; |
1118 | EMACS_INT pos_byte; | |
6bbd7a29 | 1119 | register int c = 0; |
53b2623d | 1120 | int tab_width = sane_tab_width (); |
4b4deea2 | 1121 | register int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow)); |
d44f12b4 | 1122 | register struct Lisp_Char_Table *dp = window_display_table (win); |
7831777b | 1123 | EMACS_INT selective |
4b4deea2 TT |
1124 | = (INTEGERP (BVAR (current_buffer, selective_display)) |
1125 | ? XINT (BVAR (current_buffer, selective_display)) | |
1126 | : !NILP (BVAR (current_buffer, selective_display)) ? -1 : 0); | |
993b6404 | 1127 | int selective_rlen |
eeaafd4f | 1128 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
77b37c05 | 1129 | ? ASIZE (DISP_INVIS_VECTOR (dp)) : 0); |
2ab90d49 KH |
1130 | /* The next location where the `invisible' property changes, or an |
1131 | overlay starts or ends. */ | |
83155776 | 1132 | EMACS_INT next_boundary = from; |
993b6404 | 1133 | |
0aa01123 JB |
1134 | /* For computing runs of characters with similar widths. |
1135 | Invariant: width_run_width is zero, or all the characters | |
2ff4775b | 1136 | from width_run_start to width_run_end have a fixed width of |
0aa01123 | 1137 | width_run_width. */ |
83155776 SM |
1138 | EMACS_INT width_run_start = from; |
1139 | EMACS_INT width_run_end = from; | |
1140 | EMACS_INT width_run_width = 0; | |
0aa01123 | 1141 | Lisp_Object *width_table; |
66c75ca5 | 1142 | Lisp_Object buffer; |
0aa01123 JB |
1143 | |
1144 | /* The next buffer pos where we should consult the width run cache. */ | |
83155776 | 1145 | EMACS_INT next_width_run = from; |
0e435804 | 1146 | Lisp_Object window; |
0aa01123 | 1147 | |
4b4deea2 | 1148 | int multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters)); |
c71c19f4 RS |
1149 | /* If previous char scanned was a wide character, |
1150 | this is the column where it ended. Otherwise, this is 0. */ | |
83155776 SM |
1151 | EMACS_INT wide_column_end_hpos = 0; |
1152 | EMACS_INT prev_pos; /* Previous buffer position. */ | |
1153 | EMACS_INT prev_pos_byte; /* Previous buffer position. */ | |
1154 | EMACS_INT prev_hpos = 0; | |
1155 | EMACS_INT prev_vpos = 0; | |
1156 | EMACS_INT contin_hpos; /* HPOS of last column of continued line. */ | |
1157 | EMACS_INT prev_tab_offset; /* Previous tab offset. */ | |
1158 | EMACS_INT continuation_glyph_width; | |
a997a7ca | 1159 | |
d6721dda KH |
1160 | struct composition_it cmp_it; |
1161 | ||
66c75ca5 | 1162 | XSETBUFFER (buffer, current_buffer); |
0e435804 | 1163 | XSETWINDOW (window, win); |
66c75ca5 | 1164 | |
0aa01123 JB |
1165 | width_run_cache_on_off (); |
1166 | if (dp == buffer_display_table ()) | |
4b4deea2 TT |
1167 | width_table = (VECTORP (BVAR (current_buffer, width_table)) |
1168 | ? XVECTOR (BVAR (current_buffer, width_table))->contents | |
0aa01123 JB |
1169 | : 0); |
1170 | else | |
1171 | /* If the window has its own display table, we can't use the width | |
1172 | run cache, because that's based on the buffer's display table. */ | |
1173 | width_table = 0; | |
1174 | ||
361f14bf KS |
1175 | /* Negative width means use all available text columns. */ |
1176 | if (width < 0) | |
1177 | { | |
abde8f8c | 1178 | width = window_body_cols (win); |
361f14bf KS |
1179 | /* We must make room for continuation marks if we don't have fringes. */ |
1180 | #ifdef HAVE_WINDOW_SYSTEM | |
1181 | if (!FRAME_WINDOW_P (XFRAME (win->frame))) | |
1182 | #endif | |
1183 | width -= 1; | |
1184 | } | |
1185 | ||
8cc08515 | 1186 | continuation_glyph_width = 1; |
ed5c373c | 1187 | #ifdef HAVE_WINDOW_SYSTEM |
8cc08515 KS |
1188 | if (FRAME_WINDOW_P (XFRAME (win->frame))) |
1189 | continuation_glyph_width = 0; /* In the fringe. */ | |
ed5c373c KS |
1190 | #endif |
1191 | ||
e4500116 GM |
1192 | immediate_quit = 1; |
1193 | QUIT; | |
cde9337b | 1194 | |
a997a7ca | 1195 | pos = prev_pos = from; |
fe0066f5 | 1196 | pos_byte = prev_pos_byte = CHAR_TO_BYTE (from); |
a997a7ca KH |
1197 | contin_hpos = 0; |
1198 | prev_tab_offset = tab_offset; | |
72af86bd | 1199 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
1200 | cmp_it.id = -1; |
1201 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, Qnil); | |
1202 | ||
2ab90d49 KH |
1203 | while (1) |
1204 | { | |
1205 | while (pos == next_boundary) | |
f75c0f8a | 1206 | { |
83155776 SM |
1207 | EMACS_INT pos_here = pos; |
1208 | EMACS_INT newpos; | |
98136db3 | 1209 | |
f9ba10b0 | 1210 | /* Don't skip invisible if we are already at the margin. */ |
8a00d895 | 1211 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
f9ba10b0 RS |
1212 | { |
1213 | if (contin_hpos && prev_hpos == 0 | |
1214 | && hpos > tohpos | |
1215 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
1216 | { /* Line breaks because we can't put the character at the | |
1217 | previous line any more. It is not the multi-column | |
1218 | character continued in middle. Go back to previous | |
1219 | buffer position, screen position, and set tab offset | |
1220 | to previous value. It's the beginning of the | |
1221 | line. */ | |
1222 | pos = prev_pos; | |
1223 | pos_byte = prev_pos_byte; | |
1224 | hpos = prev_hpos; | |
6b61353c | 1225 | vpos = prev_vpos; |
f9ba10b0 RS |
1226 | tab_offset = prev_tab_offset; |
1227 | } | |
1228 | break; | |
1229 | } | |
1230 | ||
2ab90d49 KH |
1231 | /* If the caller says that the screen position came from an earlier |
1232 | call to compute_motion, then we've already accounted for the | |
1233 | overlay strings at point. This is only true the first time | |
1234 | through, so clear the flag after testing it. */ | |
1235 | if (!did_motion) | |
1236 | /* We need to skip past the overlay strings. Currently those | |
a997a7ca | 1237 | strings must not contain TAB; |
2ab90d49 KH |
1238 | if we want to relax that restriction, something will have |
1239 | to be changed here. */ | |
a997a7ca KH |
1240 | { |
1241 | unsigned char *ovstr; | |
5816888b | 1242 | EMACS_INT ovlen = overlay_strings (pos, win, &ovstr); |
4116deee | 1243 | hpos += ((multibyte && ovlen > 0) |
7469ef5d | 1244 | ? strwidth ((char *) ovstr, ovlen) : ovlen); |
a997a7ca | 1245 | } |
2ab90d49 KH |
1246 | did_motion = 0; |
1247 | ||
1248 | if (pos >= to) | |
1249 | break; | |
66c75ca5 | 1250 | |
9a21bb64 RS |
1251 | /* Advance POS past invisible characters |
1252 | (but not necessarily all that there are here), | |
1253 | and store in next_boundary the next position where | |
1254 | we need to call skip_invisible. */ | |
98136db3 RS |
1255 | newpos = skip_invisible (pos, &next_boundary, to, window); |
1256 | ||
1257 | if (newpos >= to) | |
e8cb089b RS |
1258 | { |
1259 | pos = min (to, newpos); | |
bcfbd63d | 1260 | pos_byte = CHAR_TO_BYTE (pos); |
e8cb089b RS |
1261 | goto after_loop; |
1262 | } | |
98136db3 | 1263 | |
fe0066f5 RS |
1264 | if (newpos != pos_here) |
1265 | { | |
1266 | pos = newpos; | |
1267 | pos_byte = CHAR_TO_BYTE (pos); | |
1268 | } | |
f75c0f8a | 1269 | } |
2ab90d49 KH |
1270 | |
1271 | /* Handle right margin. */ | |
a997a7ca KH |
1272 | /* Note on a wide-column character. |
1273 | ||
1274 | Characters are classified into the following three categories | |
1275 | according to the width (columns occupied on screen). | |
1276 | ||
1277 | (1) single-column character: ex. `a' | |
1278 | (2) multi-column character: ex. `^A', TAB, `\033' | |
1279 | (3) wide-column character: ex. Japanese character, Chinese character | |
1280 | (In the following example, `W_' stands for them.) | |
1281 | ||
1282 | Multi-column characters can be divided around the right margin, | |
1283 | but wide-column characters cannot. | |
1284 | ||
1285 | NOTE: | |
1286 | ||
1287 | (*) The cursor is placed on the next character after the point. | |
1288 | ||
1289 | ---------- | |
1290 | abcdefghi\ | |
1291 | j ^---- next after the point | |
1292 | ^--- next char. after the point. | |
1293 | ---------- | |
1294 | In case of sigle-column character | |
1295 | ||
1296 | ---------- | |
1297 | abcdefgh\\ | |
1298 | 033 ^---- next after the point, next char. after the point. | |
1299 | ---------- | |
1300 | In case of multi-column character | |
1301 | ||
1302 | ---------- | |
1303 | abcdefgh\\ | |
1304 | W_ ^---- next after the point | |
1305 | ^---- next char. after the point. | |
1306 | ---------- | |
097812fb | 1307 | In case of wide-column character |
a997a7ca KH |
1308 | |
1309 | The problem here is continuation at a wide-column character. | |
1310 | In this case, the line may shorter less than WIDTH. | |
1311 | And we find the continuation AFTER it occurs. | |
1312 | ||
1313 | */ | |
1314 | ||
1315 | if (hpos > width) | |
2ab90d49 | 1316 | { |
81b6a665 CY |
1317 | int total_width = width + continuation_glyph_width; |
1318 | int truncate = 0; | |
1319 | ||
1320 | if (!NILP (Vtruncate_partial_width_windows) | |
1321 | && (total_width < FRAME_COLS (XFRAME (WINDOW_FRAME (win))))) | |
1322 | { | |
1323 | if (INTEGERP (Vtruncate_partial_width_windows)) | |
1324 | truncate | |
1325 | = total_width < XFASTINT (Vtruncate_partial_width_windows); | |
1326 | else | |
1327 | truncate = 1; | |
1328 | } | |
1329 | ||
1330 | if (hscroll || truncate | |
4b4deea2 | 1331 | || !NILP (BVAR (current_buffer, truncate_lines))) |
2ab90d49 | 1332 | { |
529724fe AS |
1333 | /* Truncating: skip to newline, unless we are already past |
1334 | TO (we need to go back below). */ | |
1335 | if (pos <= to) | |
fe0066f5 RS |
1336 | { |
1337 | pos = find_before_next_newline (pos, to, 1); | |
1338 | pos_byte = CHAR_TO_BYTE (pos); | |
529724fe AS |
1339 | hpos = width; |
1340 | /* If we just skipped next_boundary, | |
1341 | loop around in the main while | |
1342 | and handle it. */ | |
1343 | if (pos >= next_boundary) | |
1344 | next_boundary = pos + 1; | |
1345 | prev_hpos = width; | |
6b61353c | 1346 | prev_vpos = vpos; |
529724fe | 1347 | prev_tab_offset = tab_offset; |
fe0066f5 | 1348 | } |
2ab90d49 KH |
1349 | } |
1350 | else | |
1351 | { | |
1352 | /* Continuing. */ | |
a997a7ca KH |
1353 | /* Remember the previous value. */ |
1354 | prev_tab_offset = tab_offset; | |
1355 | ||
c9c0f7cf | 1356 | if (wide_column_end_hpos > width) |
a997a7ca KH |
1357 | { |
1358 | hpos -= prev_hpos; | |
1359 | tab_offset += prev_hpos; | |
1360 | } | |
1361 | else | |
1362 | { | |
1363 | tab_offset += width; | |
1364 | hpos -= width; | |
1365 | } | |
1366 | vpos++; | |
1367 | contin_hpos = prev_hpos; | |
1368 | prev_hpos = 0; | |
6cbc951e | 1369 | prev_vpos = vpos; |
2ab90d49 KH |
1370 | } |
1371 | } | |
1372 | ||
1373 | /* Stop if past the target buffer position or screen position. */ | |
33fe7d20 | 1374 | if (pos > to) |
a997a7ca KH |
1375 | { |
1376 | /* Go back to the previous position. */ | |
1377 | pos = prev_pos; | |
fe0066f5 | 1378 | pos_byte = prev_pos_byte; |
a997a7ca | 1379 | hpos = prev_hpos; |
6b61353c | 1380 | vpos = prev_vpos; |
a997a7ca KH |
1381 | tab_offset = prev_tab_offset; |
1382 | ||
1383 | /* NOTE on contin_hpos, hpos, and prev_hpos. | |
1384 | ||
1385 | ---------- | |
1386 | abcdefgh\\ | |
1387 | W_ ^---- contin_hpos | |
1388 | | ^----- hpos | |
1389 | \---- prev_hpos | |
1390 | ---------- | |
1391 | */ | |
1392 | ||
1393 | if (contin_hpos && prev_hpos == 0 | |
c9c0f7cf | 1394 | && contin_hpos < width && !wide_column_end_hpos) |
a997a7ca KH |
1395 | { |
1396 | /* Line breaking occurs in the middle of multi-column | |
1397 | character. Go back to previous line. */ | |
1398 | hpos = contin_hpos; | |
1399 | vpos = vpos - 1; | |
1400 | } | |
a997a7ca KH |
1401 | break; |
1402 | } | |
1403 | ||
8a00d895 | 1404 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
33fe7d20 RS |
1405 | { |
1406 | if (contin_hpos && prev_hpos == 0 | |
9129bcc3 KH |
1407 | && hpos > tohpos |
1408 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
33fe7d20 RS |
1409 | { /* Line breaks because we can't put the character at the |
1410 | previous line any more. It is not the multi-column | |
1411 | character continued in middle. Go back to previous | |
1412 | buffer position, screen position, and set tab offset | |
1413 | to previous value. It's the beginning of the | |
1414 | line. */ | |
1415 | pos = prev_pos; | |
1416 | pos_byte = prev_pos_byte; | |
1417 | hpos = prev_hpos; | |
6b61353c | 1418 | vpos = prev_vpos; |
33fe7d20 RS |
1419 | tab_offset = prev_tab_offset; |
1420 | } | |
1421 | break; | |
1422 | } | |
a997a7ca | 1423 | if (pos == ZV) /* We cannot go beyond ZV. Stop here. */ |
2ab90d49 KH |
1424 | break; |
1425 | ||
2ab90d49 | 1426 | prev_hpos = hpos; |
6b61353c | 1427 | prev_vpos = vpos; |
a997a7ca | 1428 | prev_pos = pos; |
fe0066f5 | 1429 | prev_pos_byte = pos_byte; |
c9c0f7cf | 1430 | wide_column_end_hpos = 0; |
0aa01123 JB |
1431 | |
1432 | /* Consult the width run cache to see if we can avoid inspecting | |
1433 | the text character-by-character. */ | |
1434 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
1435 | { | |
c098fdb8 | 1436 | EMACS_INT run_end; |
0aa01123 JB |
1437 | int common_width |
1438 | = region_cache_forward (current_buffer, | |
1439 | current_buffer->width_run_cache, | |
1440 | pos, &run_end); | |
1441 | ||
1442 | /* A width of zero means the character's width varies (like | |
1443 | a tab), is meaningless (like a newline), or we just don't | |
1444 | want to skip over it for some other reason. */ | |
1445 | if (common_width != 0) | |
1446 | { | |
5816888b | 1447 | EMACS_INT run_end_hpos; |
0aa01123 JB |
1448 | |
1449 | /* Don't go past the final buffer posn the user | |
1450 | requested. */ | |
1451 | if (run_end > to) | |
1452 | run_end = to; | |
1453 | ||
1454 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1455 | ||
1456 | /* Don't go past the final horizontal position the user | |
1457 | requested. */ | |
1458 | if (vpos == tovpos && run_end_hpos > tohpos) | |
1459 | { | |
1460 | run_end = pos + (tohpos - hpos) / common_width; | |
1461 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1462 | } | |
2ff4775b | 1463 | |
0aa01123 JB |
1464 | /* Don't go past the margin. */ |
1465 | if (run_end_hpos >= width) | |
1466 | { | |
1467 | run_end = pos + (width - hpos) / common_width; | |
1468 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1469 | } | |
1470 | ||
1471 | hpos = run_end_hpos; | |
1472 | if (run_end > pos) | |
1473 | prev_hpos = hpos - common_width; | |
fe0066f5 RS |
1474 | if (pos != run_end) |
1475 | { | |
1476 | pos = run_end; | |
1477 | pos_byte = CHAR_TO_BYTE (pos); | |
1478 | } | |
0aa01123 JB |
1479 | } |
1480 | ||
1481 | next_width_run = run_end + 1; | |
1482 | } | |
1483 | ||
1484 | /* We have to scan the text character-by-character. */ | |
993b6404 | 1485 | else |
2ab90d49 | 1486 | { |
88c6e37e GM |
1487 | EMACS_INT i, n; |
1488 | Lisp_Object charvec; | |
097812fb | 1489 | |
012fd715 | 1490 | /* Check composition sequence. */ |
d6721dda KH |
1491 | if (cmp_it.id >= 0 |
1492 | || (pos == cmp_it.stop_pos | |
1493 | && composition_reseat_it (&cmp_it, pos, pos_byte, to, win, | |
1494 | NULL, Qnil))) | |
1495 | composition_update_it (&cmp_it, pos, pos_byte, Qnil); | |
1496 | if (cmp_it.id >= 0) | |
1497 | { | |
1498 | pos += cmp_it.nchars; | |
1499 | pos_byte += cmp_it.nbytes; | |
1500 | hpos += cmp_it.width; | |
1501 | if (cmp_it.to == cmp_it.nglyphs) | |
1502 | { | |
1503 | cmp_it.id = -1; | |
1504 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, | |
1505 | Qnil); | |
1506 | } | |
1507 | else | |
1508 | cmp_it.from = cmp_it.to; | |
1509 | continue; | |
1510 | } | |
012fd715 | 1511 | |
d6721dda | 1512 | c = FETCH_BYTE (pos_byte); |
fe0066f5 | 1513 | pos++, pos_byte++; |
0aa01123 | 1514 | |
2ab90d49 KH |
1515 | /* Perhaps add some info to the width_run_cache. */ |
1516 | if (current_buffer->width_run_cache) | |
1517 | { | |
1518 | /* Is this character part of the current run? If so, extend | |
1519 | the run. */ | |
1520 | if (pos - 1 == width_run_end | |
5db0afb7 | 1521 | && XFASTINT (width_table[c]) == width_run_width) |
2ab90d49 KH |
1522 | width_run_end = pos; |
1523 | ||
1524 | /* The previous run is over, since this is a character at a | |
1525 | different position, or a different width. */ | |
1526 | else | |
1527 | { | |
1528 | /* Have we accumulated a run to put in the cache? | |
1529 | (Currently, we only cache runs of width == 1). */ | |
1530 | if (width_run_start < width_run_end | |
1531 | && width_run_width == 1) | |
1532 | know_region_cache (current_buffer, | |
1533 | current_buffer->width_run_cache, | |
1534 | width_run_start, width_run_end); | |
1535 | ||
1536 | /* Start recording a new width run. */ | |
5db0afb7 | 1537 | width_run_width = XFASTINT (width_table[c]); |
2ab90d49 KH |
1538 | width_run_start = pos - 1; |
1539 | width_run_end = pos; | |
1540 | } | |
1541 | } | |
993b6404 | 1542 | |
c9c0f7cf | 1543 | if (dp != 0 |
409f2919 | 1544 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 1545 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
993b6404 | 1546 | { |
88c6e37e GM |
1547 | charvec = DISP_CHAR_VECTOR (dp, c); |
1548 | n = ASIZE (charvec); | |
993b6404 | 1549 | } |
88c6e37e | 1550 | else |
993b6404 | 1551 | { |
88c6e37e GM |
1552 | charvec = Qnil; |
1553 | n = 1; | |
1554 | } | |
1555 | ||
1556 | for (i = n - 1; i >= 0; --i) | |
1557 | { | |
1558 | if (VECTORP (charvec)) | |
2ab90d49 | 1559 | { |
88c6e37e GM |
1560 | /* This should be handled the same as |
1561 | next_element_from_display_vector does it. */ | |
1562 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 1563 | |
f59836fe KS |
1564 | if (GLYPH_CODE_P (entry) |
1565 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
1566 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
1567 | else |
1568 | c = ' '; | |
1569 | } | |
097812fb | 1570 | |
88c6e37e GM |
1571 | if (c >= 040 && c < 0177) |
1572 | hpos++; | |
1573 | else if (c == '\t') | |
1574 | { | |
1575 | int tem = ((hpos + tab_offset + hscroll - (hscroll > 0)) | |
1576 | % tab_width); | |
1577 | if (tem < 0) | |
1578 | tem += tab_width; | |
1579 | hpos += tab_width - tem; | |
1580 | } | |
1581 | else if (c == '\n') | |
1582 | { | |
1583 | if (selective > 0 | |
7831777b | 1584 | && indented_beyond_p (pos, pos_byte, selective)) |
2ab90d49 | 1585 | { |
88c6e37e GM |
1586 | /* If (pos == to), we don't have to take care of |
1587 | selective display. */ | |
1588 | if (pos < to) | |
fe0066f5 | 1589 | { |
88c6e37e GM |
1590 | /* Skip any number of invisible lines all at once */ |
1591 | do | |
1592 | { | |
1593 | pos = find_before_next_newline (pos, to, 1); | |
1594 | if (pos < to) | |
1595 | pos++; | |
1596 | pos_byte = CHAR_TO_BYTE (pos); | |
1597 | } | |
1598 | while (pos < to | |
097812fb | 1599 | && indented_beyond_p (pos, pos_byte, |
7831777b | 1600 | selective)); |
88c6e37e GM |
1601 | /* Allow for the " ..." that is displayed for them. */ |
1602 | if (selective_rlen) | |
1603 | { | |
1604 | hpos += selective_rlen; | |
1605 | if (hpos >= width) | |
1606 | hpos = width; | |
1607 | } | |
1608 | DEC_BOTH (pos, pos_byte); | |
1609 | /* We have skipped the invis text, but not the | |
1610 | newline after. */ | |
fe0066f5 | 1611 | } |
2ab90d49 | 1612 | } |
88c6e37e GM |
1613 | else |
1614 | { | |
1615 | /* A visible line. */ | |
1616 | vpos++; | |
1617 | hpos = 0; | |
1618 | hpos -= hscroll; | |
1619 | /* Count the truncation glyph on column 0 */ | |
1620 | if (hscroll > 0) | |
ed5c373c | 1621 | hpos += continuation_glyph_width; |
88c6e37e GM |
1622 | tab_offset = 0; |
1623 | } | |
1624 | contin_hpos = 0; | |
2ab90d49 | 1625 | } |
88c6e37e | 1626 | else if (c == CR && selective < 0) |
fe0066f5 | 1627 | { |
88c6e37e GM |
1628 | /* In selective display mode, |
1629 | everything from a ^M to the end of the line is invisible. | |
1630 | Stop *before* the real newline. */ | |
1631 | if (pos < to) | |
1632 | { | |
1633 | pos = find_before_next_newline (pos, to, 1); | |
1634 | pos_byte = CHAR_TO_BYTE (pos); | |
1635 | } | |
1636 | /* If we just skipped next_boundary, | |
1637 | loop around in the main while | |
1638 | and handle it. */ | |
1639 | if (pos > next_boundary) | |
1640 | next_boundary = pos; | |
1641 | /* Allow for the " ..." that is displayed for them. */ | |
1642 | if (selective_rlen) | |
1643 | { | |
1644 | hpos += selective_rlen; | |
1645 | if (hpos >= width) | |
1646 | hpos = width; | |
1647 | } | |
fe0066f5 | 1648 | } |
409f2919 | 1649 | else if (multibyte && LEADING_CODE_P (c)) |
2ab90d49 | 1650 | { |
88c6e37e GM |
1651 | /* Start of multi-byte form. */ |
1652 | unsigned char *ptr; | |
c59478bc | 1653 | int mb_bytes, mb_width; |
88c6e37e GM |
1654 | |
1655 | pos_byte--; /* rewind POS_BYTE */ | |
1656 | ptr = BYTE_POS_ADDR (pos_byte); | |
85f24f61 PE |
1657 | MULTIBYTE_BYTES_WIDTH (ptr, dp, mb_bytes, mb_width); |
1658 | pos_byte += mb_bytes; | |
c59478bc PE |
1659 | if (mb_width > 1 && BYTES_BY_CHAR_HEAD (*ptr) == mb_bytes) |
1660 | wide_column_end_hpos = hpos + mb_width; | |
85f24f61 | 1661 | hpos += mb_width; |
2ab90d49 | 1662 | } |
f1004faf GM |
1663 | else if (VECTORP (charvec)) |
1664 | ++hpos; | |
88c6e37e GM |
1665 | else |
1666 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
2ab90d49 | 1667 | } |
993b6404 JB |
1668 | } |
1669 | } | |
1670 | ||
98136db3 RS |
1671 | after_loop: |
1672 | ||
0aa01123 JB |
1673 | /* Remember any final width run in the cache. */ |
1674 | if (current_buffer->width_run_cache | |
1675 | && width_run_width == 1 | |
1676 | && width_run_start < width_run_end) | |
1677 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
1678 | width_run_start, width_run_end); | |
1679 | ||
993b6404 | 1680 | val_compute_motion.bufpos = pos; |
fe0066f5 | 1681 | val_compute_motion.bytepos = pos_byte; |
cde9337b JB |
1682 | val_compute_motion.hpos = hpos; |
1683 | val_compute_motion.vpos = vpos; | |
ef3af330 AS |
1684 | if (contin_hpos && prev_hpos == 0) |
1685 | val_compute_motion.prevhpos = contin_hpos; | |
1686 | else | |
1687 | val_compute_motion.prevhpos = prev_hpos; | |
927b5a55 RS |
1688 | /* We alalways handle all of them here; none of them remain to do. */ |
1689 | val_compute_motion.ovstring_chars_done = 0; | |
993b6404 JB |
1690 | |
1691 | /* Nonzero if have just continued a line */ | |
a997a7ca | 1692 | val_compute_motion.contin = (contin_hpos && prev_hpos == 0); |
993b6404 | 1693 | |
e4500116 | 1694 | immediate_quit = 0; |
993b6404 JB |
1695 | return &val_compute_motion; |
1696 | } | |
993b6404 | 1697 | |
8720a429 | 1698 | |
88af3af4 | 1699 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
8c1a1077 PJ |
1700 | doc: /* Scan through the current buffer, calculating screen position. |
1701 | Scan the current buffer forward from offset FROM, | |
1702 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
1703 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
1704 | and return the ending buffer position and screen location. | |
1705 | ||
361f14bf KS |
1706 | If TOPOS is nil, the actual width and height of the window's |
1707 | text area are used. | |
1708 | ||
8c1a1077 PJ |
1709 | There are three additional arguments: |
1710 | ||
1711 | WIDTH is the number of columns available to display text; | |
361f14bf KS |
1712 | this affects handling of continuation lines. A value of nil |
1713 | corresponds to the actual number of available text columns. | |
8c1a1077 PJ |
1714 | |
1715 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
1716 | HSCROLL is the number of columns not being displayed at the left | |
1717 | margin; this is usually taken from a window's hscroll member. | |
1718 | TAB-OFFSET is the number of columns of the first tab that aren't | |
1719 | being displayed, perhaps because the line was continued within it. | |
1720 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
1721 | ||
1722 | WINDOW is the window to operate on. It is used to choose the display table; | |
1723 | if it is showing the current buffer, it is used also for | |
1724 | deciding which overlay properties apply. | |
1725 | Note that `compute-motion' always operates on the current buffer. | |
1726 | ||
1727 | The value is a list of five elements: | |
1728 | (POS HPOS VPOS PREVHPOS CONTIN) | |
1729 | POS is the buffer position where the scan stopped. | |
1730 | VPOS is the vertical position where the scan stopped. | |
1731 | HPOS is the horizontal position where the scan stopped. | |
1732 | ||
1733 | PREVHPOS is the horizontal position one character back from POS. | |
1734 | CONTIN is t if a line was continued after (or within) the previous character. | |
1735 | ||
1736 | For example, to find the buffer position of column COL of line LINE | |
1737 | of a certain window, pass the window's starting location as FROM | |
1738 | and the window's upper-left coordinates as FROMPOS. | |
1739 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
1740 | visible section of the buffer, and pass LINE and COL as TOPOS. */) | |
5842a27b | 1741 | (Lisp_Object from, Lisp_Object frompos, Lisp_Object to, Lisp_Object topos, Lisp_Object width, Lisp_Object offsets, Lisp_Object window) |
42918ba5 | 1742 | { |
361f14bf | 1743 | struct window *w; |
8798a92b | 1744 | Lisp_Object bufpos, hpos, vpos, prevhpos; |
42918ba5 | 1745 | struct position *pos; |
8fcaf9cc | 1746 | EMACS_INT hscroll, tab_offset; |
42918ba5 | 1747 | |
b7826503 PJ |
1748 | CHECK_NUMBER_COERCE_MARKER (from); |
1749 | CHECK_CONS (frompos); | |
1750 | CHECK_NUMBER_CAR (frompos); | |
1751 | CHECK_NUMBER_CDR (frompos); | |
1752 | CHECK_NUMBER_COERCE_MARKER (to); | |
361f14bf KS |
1753 | if (!NILP (topos)) |
1754 | { | |
1755 | CHECK_CONS (topos); | |
1756 | CHECK_NUMBER_CAR (topos); | |
1757 | CHECK_NUMBER_CDR (topos); | |
1758 | } | |
1759 | if (!NILP (width)) | |
1760 | CHECK_NUMBER (width); | |
1761 | ||
42918ba5 RS |
1762 | if (!NILP (offsets)) |
1763 | { | |
b7826503 PJ |
1764 | CHECK_CONS (offsets); |
1765 | CHECK_NUMBER_CAR (offsets); | |
1766 | CHECK_NUMBER_CDR (offsets); | |
70949dac KR |
1767 | hscroll = XINT (XCAR (offsets)); |
1768 | tab_offset = XINT (XCDR (offsets)); | |
42918ba5 RS |
1769 | } |
1770 | else | |
1771 | hscroll = tab_offset = 0; | |
1772 | ||
88af3af4 KH |
1773 | if (NILP (window)) |
1774 | window = Fselected_window (); | |
1775 | else | |
b7826503 | 1776 | CHECK_LIVE_WINDOW (window); |
361f14bf | 1777 | w = XWINDOW (window); |
88af3af4 | 1778 | |
9fdae274 KH |
1779 | if (XINT (from) < BEGV || XINT (from) > ZV) |
1780 | args_out_of_range_3 (from, make_number (BEGV), make_number (ZV)); | |
1781 | if (XINT (to) < BEGV || XINT (to) > ZV) | |
1782 | args_out_of_range_3 (to, make_number (BEGV), make_number (ZV)); | |
1783 | ||
70949dac KR |
1784 | pos = compute_motion (XINT (from), XINT (XCDR (frompos)), |
1785 | XINT (XCAR (frompos)), 0, | |
361f14bf KS |
1786 | XINT (to), |
1787 | (NILP (topos) | |
1788 | ? window_internal_height (w) | |
1789 | : XINT (XCDR (topos))), | |
1790 | (NILP (topos) | |
abde8f8c | 1791 | ? (window_body_cols (w) |
361f14bf KS |
1792 | - ( |
1793 | #ifdef HAVE_WINDOW_SYSTEM | |
1794 | FRAME_WINDOW_P (XFRAME (w->frame)) ? 0 : | |
1795 | #endif | |
1796 | 1)) | |
1797 | : XINT (XCAR (topos))), | |
1798 | (NILP (width) ? -1 : XINT (width)), | |
1799 | hscroll, tab_offset, | |
88af3af4 | 1800 | XWINDOW (window)); |
42918ba5 | 1801 | |
94d92e9c | 1802 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
1803 | XSETINT (hpos, pos->hpos); |
1804 | XSETINT (vpos, pos->vpos); | |
1805 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
1806 | |
1807 | return Fcons (bufpos, | |
1808 | Fcons (hpos, | |
1809 | Fcons (vpos, | |
1810 | Fcons (prevhpos, | |
1811 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
1812 | ||
1813 | } | |
993b6404 | 1814 | \f |
0aa01123 | 1815 | /* Fvertical_motion and vmotion */ |
88c6e37e | 1816 | |
9306c32e | 1817 | static struct position val_vmotion; |
993b6404 JB |
1818 | |
1819 | struct position * | |
971de7fb | 1820 | vmotion (register EMACS_INT from, register EMACS_INT vtarget, struct window *w) |
993b6404 | 1821 | { |
83155776 | 1822 | EMACS_INT hscroll = XINT (w->hscroll); |
993b6404 JB |
1823 | struct position pos; |
1824 | /* vpos is cumulative vertical position, changed as from is changed */ | |
1825 | register int vpos = 0; | |
83155776 SM |
1826 | EMACS_INT prevline; |
1827 | register EMACS_INT first; | |
1828 | EMACS_INT from_byte; | |
1829 | EMACS_INT lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
7831777b | 1830 | EMACS_INT selective |
4b4deea2 TT |
1831 | = (INTEGERP (BVAR (current_buffer, selective_display)) |
1832 | ? XINT (BVAR (current_buffer, selective_display)) | |
1833 | : !NILP (BVAR (current_buffer, selective_display)) ? -1 : 0); | |
99ce22d5 | 1834 | Lisp_Object window; |
83155776 | 1835 | EMACS_INT start_hpos = 0; |
2ab90d49 | 1836 | int did_motion; |
7ac57cb3 RS |
1837 | /* This is the object we use for fetching character properties. */ |
1838 | Lisp_Object text_prop_object; | |
99ce22d5 KH |
1839 | |
1840 | XSETWINDOW (window, w); | |
1841 | ||
7ac57cb3 RS |
1842 | /* If the window contains this buffer, use it for getting text properties. |
1843 | Otherwise use the current buffer as arg for doing that. */ | |
1844 | if (EQ (w->buffer, Fcurrent_buffer ())) | |
1845 | text_prop_object = window; | |
1846 | else | |
1847 | text_prop_object = Fcurrent_buffer (); | |
1848 | ||
99ce22d5 | 1849 | if (vpos >= vtarget) |
993b6404 | 1850 | { |
99ce22d5 | 1851 | /* To move upward, go a line at a time until |
fe0066f5 | 1852 | we have gone at least far enough. */ |
99ce22d5 KH |
1853 | |
1854 | first = 1; | |
1855 | ||
1856 | while ((vpos > vtarget || first) && from > BEGV) | |
993b6404 | 1857 | { |
66c75ca5 RS |
1858 | Lisp_Object propval; |
1859 | ||
2965dff9 RS |
1860 | prevline = find_next_newline_no_quit (from - 1, -1); |
1861 | while (prevline > BEGV | |
5a05d3d2 | 1862 | && ((selective > 0 |
2965dff9 RS |
1863 | && indented_beyond_p (prevline, |
1864 | CHAR_TO_BYTE (prevline), | |
7831777b | 1865 | selective)) |
2965dff9 RS |
1866 | /* Watch out for newlines with `invisible' property. |
1867 | When moving upward, check the newline before. */ | |
1868 | || (propval = Fget_char_property (make_number (prevline - 1), | |
66c75ca5 | 1869 | Qinvisible, |
7ac57cb3 | 1870 | text_prop_object), |
339ee979 | 1871 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1872 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1873 | pos = *compute_motion (prevline, 0, | |
1874 | lmargin + (prevline == BEG ? start_hpos : 0), | |
2ab90d49 | 1875 | 0, |
097812fb | 1876 | from, |
a997a7ca KH |
1877 | /* Don't care for VPOS... */ |
1878 | 1 << (BITS_PER_SHORT - 1), | |
1879 | /* ... nor HPOS. */ | |
1880 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1881 | -1, hscroll, |
2dd4e608 RS |
1882 | /* This compensates for start_hpos |
1883 | so that a tab as first character | |
1884 | still occupies 8 columns. */ | |
2965dff9 | 1885 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1886 | w); |
99ce22d5 KH |
1887 | vpos -= pos.vpos; |
1888 | first = 0; | |
2965dff9 | 1889 | from = prevline; |
993b6404 | 1890 | } |
99ce22d5 KH |
1891 | |
1892 | /* If we made exactly the desired vertical distance, | |
1893 | or if we hit beginning of buffer, | |
1894 | return point found */ | |
1895 | if (vpos >= vtarget) | |
993b6404 | 1896 | { |
99ce22d5 | 1897 | val_vmotion.bufpos = from; |
fe0066f5 | 1898 | val_vmotion.bytepos = CHAR_TO_BYTE (from); |
99ce22d5 KH |
1899 | val_vmotion.vpos = vpos; |
1900 | val_vmotion.hpos = lmargin; | |
1901 | val_vmotion.contin = 0; | |
1902 | val_vmotion.prevhpos = 0; | |
927b5a55 | 1903 | val_vmotion.ovstring_chars_done = 0; |
a997a7ca | 1904 | val_vmotion.tab_offset = 0; /* For accumulating tab offset. */ |
99ce22d5 | 1905 | return &val_vmotion; |
993b6404 | 1906 | } |
993b6404 | 1907 | |
99ce22d5 KH |
1908 | /* Otherwise find the correct spot by moving down */ |
1909 | } | |
1910 | /* Moving downward is simple, but must calculate from beg of line | |
1911 | to determine hpos of starting point */ | |
fe0066f5 RS |
1912 | from_byte = CHAR_TO_BYTE (from); |
1913 | if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n') | |
993b6404 | 1914 | { |
2ab90d49 | 1915 | Lisp_Object propval; |
66c75ca5 | 1916 | |
2965dff9 RS |
1917 | prevline = find_next_newline_no_quit (from, -1); |
1918 | while (prevline > BEGV | |
99ce22d5 | 1919 | && ((selective > 0 |
2965dff9 RS |
1920 | && indented_beyond_p (prevline, |
1921 | CHAR_TO_BYTE (prevline), | |
7831777b | 1922 | selective)) |
2965dff9 RS |
1923 | /* Watch out for newlines with `invisible' property. |
1924 | When moving downward, check the newline after. */ | |
1925 | || (propval = Fget_char_property (make_number (prevline), | |
1926 | Qinvisible, | |
7ac57cb3 | 1927 | text_prop_object), |
339ee979 | 1928 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1929 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1930 | pos = *compute_motion (prevline, 0, | |
1931 | lmargin + (prevline == BEG | |
92992c7e | 1932 | ? start_hpos : 0), |
2ab90d49 | 1933 | 0, |
097812fb | 1934 | from, |
a997a7ca KH |
1935 | /* Don't care for VPOS... */ |
1936 | 1 << (BITS_PER_SHORT - 1), | |
1937 | /* ... nor HPOS. */ | |
1938 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1939 | -1, hscroll, |
2965dff9 | 1940 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1941 | w); |
2ab90d49 | 1942 | did_motion = 1; |
993b6404 | 1943 | } |
99ce22d5 | 1944 | else |
993b6404 | 1945 | { |
99ce22d5 KH |
1946 | pos.hpos = lmargin + (from == BEG ? start_hpos : 0); |
1947 | pos.vpos = 0; | |
a997a7ca | 1948 | pos.tab_offset = 0; |
2ab90d49 | 1949 | did_motion = 0; |
993b6404 | 1950 | } |
2ab90d49 | 1951 | return compute_motion (from, vpos, pos.hpos, did_motion, |
a997a7ca | 1952 | ZV, vtarget, - (1 << (BITS_PER_SHORT - 1)), |
361f14bf | 1953 | -1, hscroll, |
a997a7ca | 1954 | pos.tab_offset - (from == BEG ? start_hpos : 0), |
2dd4e608 | 1955 | w); |
993b6404 JB |
1956 | } |
1957 | ||
a7ca3326 | 1958 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
8c1a1077 PJ |
1959 | doc: /* Move point to start of the screen line LINES lines down. |
1960 | If LINES is negative, this means moving up. | |
1961 | ||
1962 | This function is an ordinary cursor motion function | |
1963 | which calculates the new position based on how text would be displayed. | |
1964 | The new position may be the start of a line, | |
1965 | or just the start of a continuation line. | |
1966 | The function returns number of screen lines moved over; | |
1967 | that usually equals LINES, but may be closer to zero | |
1968 | if beginning or end of buffer was reached. | |
1969 | ||
1970 | The optional second argument WINDOW specifies the window to use for | |
1971 | parameters such as width, horizontal scrolling, and so on. | |
1972 | The default is to use the selected window's parameters. | |
1973 | ||
c876b227 SM |
1974 | LINES can optionally take the form (COLS . LINES), in which case |
1975 | the motion will not stop at the start of a screen line but on | |
1976 | its column COLS (if such exists on that line, that is). | |
1977 | ||
8c1a1077 PJ |
1978 | `vertical-motion' always uses the current buffer, |
1979 | regardless of which buffer is displayed in WINDOW. | |
1980 | This is consistent with other cursor motion functions | |
1981 | and makes it possible to use `vertical-motion' in any buffer, | |
1982 | whether or not it is currently displayed in some window. */) | |
5842a27b | 1983 | (Lisp_Object lines, Lisp_Object window) |
993b6404 | 1984 | { |
8720a429 GM |
1985 | struct it it; |
1986 | struct text_pos pt; | |
8720a429 | 1987 | struct window *w; |
39210e90 GM |
1988 | Lisp_Object old_buffer; |
1989 | struct gcpro gcpro1; | |
baed8445 | 1990 | Lisp_Object lcols = Qnil; |
5671df8f | 1991 | double cols IF_LINT (= 0); |
c876b227 SM |
1992 | |
1993 | /* Allow LINES to be of the form (HPOS . VPOS) aka (COLUMNS . LINES). */ | |
1994 | if (CONSP (lines) && (NUMBERP (XCAR (lines)))) | |
1995 | { | |
baed8445 SM |
1996 | lcols = XCAR (lines); |
1997 | cols = INTEGERP (lcols) ? (double) XINT (lcols) : XFLOAT_DATA (lcols); | |
c876b227 SM |
1998 | lines = XCDR (lines); |
1999 | } | |
993b6404 | 2000 | |
b7826503 | 2001 | CHECK_NUMBER (lines); |
f1ecfe9b | 2002 | if (! NILP (window)) |
b7826503 | 2003 | CHECK_WINDOW (window); |
f1ecfe9b | 2004 | else |
92992c7e | 2005 | window = selected_window; |
8720a429 | 2006 | w = XWINDOW (window); |
39210e90 GM |
2007 | |
2008 | old_buffer = Qnil; | |
2009 | GCPRO1 (old_buffer); | |
2010 | if (XBUFFER (w->buffer) != current_buffer) | |
8720a429 | 2011 | { |
39210e90 GM |
2012 | /* Set the window's buffer temporarily to the current buffer. */ |
2013 | old_buffer = w->buffer; | |
2014 | XSETBUFFER (w->buffer, current_buffer); | |
8720a429 | 2015 | } |
097812fb | 2016 | |
6df71429 | 2017 | if (noninteractive) |
9305b0e7 | 2018 | { |
6df71429 RS |
2019 | struct position pos; |
2020 | pos = *vmotion (PT, XINT (lines), w); | |
2021 | SET_PT_BOTH (pos.bufpos, pos.bytepos); | |
9305b0e7 KS |
2022 | } |
2023 | else | |
6df71429 | 2024 | { |
d1dfb56c EZ |
2025 | EMACS_INT it_start; |
2026 | int first_x, it_overshoot_expected IF_LINT (= 0); | |
24a06d04 | 2027 | |
6df71429 RS |
2028 | SET_TEXT_POS (pt, PT, PT_BYTE); |
2029 | start_display (&it, w, pt); | |
2f4ec7ce | 2030 | first_x = it.first_visible_x; |
24a06d04 | 2031 | it_start = IT_CHARPOS (it); |
14a7cabf | 2032 | |
48cdfb4b CY |
2033 | /* See comments below for why we calculate this. */ |
2034 | if (XINT (lines) > 0) | |
14a7cabf | 2035 | { |
d6721dda KH |
2036 | if (it.cmp_it.id >= 0) |
2037 | it_overshoot_expected = 1; | |
187bc86f | 2038 | else if (it.method == GET_FROM_STRING) |
48cdfb4b | 2039 | { |
42a5b22f | 2040 | const char *s = SSDATA (it.string); |
48cdfb4b CY |
2041 | const char *e = s + SBYTES (it.string); |
2042 | while (s < e && *s != '\n') | |
2043 | ++s; | |
2044 | it_overshoot_expected = (s == e) ? -1 : 0; | |
2045 | } | |
2046 | else | |
2047 | it_overshoot_expected = (it.method == GET_FROM_IMAGE | |
d6721dda | 2048 | || it.method == GET_FROM_STRETCH); |
14a7cabf | 2049 | } |
14a7cabf | 2050 | |
48cdfb4b CY |
2051 | /* Scan from the start of the line containing PT. If we don't |
2052 | do this, we start moving with IT->current_x == 0, while PT is | |
2053 | really at some x > 0. */ | |
b54a7539 KS |
2054 | reseat_at_previous_visible_line_start (&it); |
2055 | it.current_x = it.hpos = 0; | |
af2be002 | 2056 | if (IT_CHARPOS (it) != PT) |
11fb10de CY |
2057 | /* We used to temporarily disable selective display here; the |
2058 | comment said this is "so we don't move too far" (2005-01-19 | |
2059 | checkin by kfs). But this does nothing useful that I can | |
2060 | tell, and it causes Bug#2694 . -- cyd */ | |
2061 | move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS); | |
b54a7539 | 2062 | |
48cdfb4b | 2063 | if (XINT (lines) <= 0) |
72ad106b | 2064 | { |
48cdfb4b CY |
2065 | it.vpos = 0; |
2066 | /* Do this even if LINES is 0, so that we move back to the | |
2067 | beginning of the current line as we ought. */ | |
2068 | if (XINT (lines) == 0 || IT_CHARPOS (it) > 0) | |
e4cc2dfc | 2069 | move_it_by_lines (&it, XINT (lines)); |
48cdfb4b CY |
2070 | } |
2071 | else | |
2072 | { | |
2421af7e | 2073 | if (IT_CHARPOS (it) > it_start) |
48cdfb4b CY |
2074 | { |
2075 | /* IT may move too far if truncate-lines is on and PT | |
2076 | lies beyond the right margin. In that case, | |
2077 | backtrack unless the starting point is on an image, | |
2078 | stretch glyph, composition, or Lisp string. */ | |
2079 | if (!it_overshoot_expected | |
2080 | /* Also, backtrack if the Lisp string contains no | |
2081 | newline, but there is a newline right after it. | |
2082 | In this case, IT overshoots if there is an | |
2083 | after-string just before the newline. */ | |
2084 | || (it_overshoot_expected < 0 | |
2085 | && it.method == GET_FROM_BUFFER | |
2086 | && it.c == '\n')) | |
e4cc2dfc | 2087 | move_it_by_lines (&it, -1); |
48cdfb4b | 2088 | it.vpos = 0; |
e4cc2dfc | 2089 | move_it_by_lines (&it, XINT (lines)); |
48cdfb4b CY |
2090 | } |
2091 | else | |
2092 | { | |
2093 | /* Otherwise, we are at the first row occupied by PT, | |
2094 | which might span multiple screen lines (e.g., if it's | |
2095 | on a multi-line display string). We want to start | |
2096 | from the last line that it occupies. */ | |
051facec | 2097 | if (it_start < ZV) |
48cdfb4b | 2098 | { |
2421af7e | 2099 | while (IT_CHARPOS (it) <= it_start) |
d8a7e7fc CY |
2100 | { |
2101 | it.vpos = 0; | |
e4cc2dfc | 2102 | move_it_by_lines (&it, 1); |
d8a7e7fc CY |
2103 | } |
2104 | if (XINT (lines) > 1) | |
e4cc2dfc | 2105 | move_it_by_lines (&it, XINT (lines) - 1); |
48cdfb4b CY |
2106 | } |
2107 | else | |
d8a7e7fc CY |
2108 | { |
2109 | it.vpos = 0; | |
e4cc2dfc | 2110 | move_it_by_lines (&it, XINT (lines)); |
d8a7e7fc | 2111 | } |
48cdfb4b | 2112 | } |
72ad106b | 2113 | } |
097812fb | 2114 | |
2f4ec7ce | 2115 | /* Move to the goal column, if one was specified. */ |
baed8445 | 2116 | if (!NILP (lcols)) |
2f4ec7ce CY |
2117 | { |
2118 | /* If the window was originally hscrolled, move forward by | |
2119 | the hscrolled amount first. */ | |
2120 | if (first_x > 0) | |
2121 | { | |
2122 | move_it_in_display_line (&it, ZV, first_x, MOVE_TO_X); | |
2123 | it.current_x = 0; | |
2124 | } | |
2125 | move_it_in_display_line | |
2126 | (&it, ZV, | |
2127 | (int)(cols * FRAME_COLUMN_WIDTH (XFRAME (w->frame)) + 0.5), | |
2128 | MOVE_TO_X); | |
2129 | } | |
c876b227 | 2130 | |
6df71429 RS |
2131 | SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it)); |
2132 | } | |
8720a429 | 2133 | |
39210e90 GM |
2134 | if (BUFFERP (old_buffer)) |
2135 | w->buffer = old_buffer; | |
097812fb | 2136 | |
39210e90 | 2137 | RETURN_UNGCPRO (make_number (it.vpos)); |
993b6404 | 2138 | } |
8720a429 GM |
2139 | |
2140 | ||
993b6404 | 2141 | \f |
88c6e37e | 2142 | /* File's initialization. */ |
0aa01123 | 2143 | |
dfcf069d | 2144 | void |
971de7fb | 2145 | syms_of_indent (void) |
993b6404 | 2146 | { |
29208e82 | 2147 | DEFVAR_BOOL ("indent-tabs-mode", indent_tabs_mode, |
c86f7377 | 2148 | doc: /* *Indentation can insert tabs if this is non-nil. */); |
993b6404 JB |
2149 | indent_tabs_mode = 1; |
2150 | ||
2151 | defsubr (&Scurrent_indentation); | |
2152 | defsubr (&Sindent_to); | |
2153 | defsubr (&Scurrent_column); | |
2154 | defsubr (&Smove_to_column); | |
2155 | defsubr (&Svertical_motion); | |
42918ba5 | 2156 | defsubr (&Scompute_motion); |
993b6404 | 2157 | } |