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 | ||
7831777b | 321 | EMACS_INT |
971de7fb | 322 | current_column (void) |
993b6404 | 323 | { |
7831777b | 324 | register EMACS_INT col; |
993b6404 JB |
325 | register unsigned char *ptr, *stop; |
326 | register int tab_seen; | |
7831777b | 327 | EMACS_INT post_tab; |
993b6404 | 328 | register int c; |
7831777b | 329 | register EMACS_INT tab_width = XINT (BVAR (current_buffer, tab_width)); |
4b4deea2 | 330 | int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow)); |
d44f12b4 | 331 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
993b6404 | 332 | |
6ec8bbd2 | 333 | if (PT == last_known_column_point |
993b6404 JB |
334 | && MODIFF == last_known_column_modified) |
335 | return last_known_column; | |
336 | ||
813b81b3 RS |
337 | /* If the buffer has overlays, text properties, |
338 | or multibyte characters, use a more general algorithm. */ | |
9a21bb64 | 339 | if (BUF_INTERVALS (current_buffer) |
3ea2f6f3 SM |
340 | || current_buffer->overlays_before |
341 | || current_buffer->overlays_after | |
813b81b3 RS |
342 | || Z != Z_BYTE) |
343 | return current_column_1 (); | |
9a21bb64 RS |
344 | |
345 | /* Scan backwards from point to the previous newline, | |
346 | counting width. Tab characters are the only complicated case. */ | |
347 | ||
993b6404 | 348 | /* Make a pointer for decrementing through the chars before point. */ |
fe0066f5 | 349 | ptr = BYTE_POS_ADDR (PT_BYTE - 1) + 1; |
993b6404 JB |
350 | /* Make a pointer to where consecutive chars leave off, |
351 | going backwards from point. */ | |
6ec8bbd2 | 352 | if (PT == BEGV) |
993b6404 | 353 | stop = ptr; |
6ec8bbd2 | 354 | else if (PT <= GPT || BEGV > GPT) |
993b6404 JB |
355 | stop = BEGV_ADDR; |
356 | else | |
357 | stop = GAP_END_ADDR; | |
358 | ||
88c6e37e GM |
359 | if (tab_width <= 0 || tab_width > 1000) |
360 | tab_width = 8; | |
993b6404 JB |
361 | |
362 | col = 0, tab_seen = 0, post_tab = 0; | |
363 | ||
364 | while (1) | |
365 | { | |
88c6e37e GM |
366 | EMACS_INT i, n; |
367 | Lisp_Object charvec; | |
097812fb | 368 | |
993b6404 JB |
369 | if (ptr == stop) |
370 | { | |
371 | /* We stopped either for the beginning of the buffer | |
372 | or for the gap. */ | |
373 | if (ptr == BEGV_ADDR) | |
374 | break; | |
097812fb | 375 | |
993b6404 JB |
376 | /* It was the gap. Jump back over it. */ |
377 | stop = BEGV_ADDR; | |
378 | ptr = GPT_ADDR; | |
097812fb | 379 | |
993b6404 | 380 | /* Check whether that brings us to beginning of buffer. */ |
88c6e37e GM |
381 | if (BEGV >= GPT) |
382 | break; | |
993b6404 JB |
383 | } |
384 | ||
385 | c = *--ptr; | |
097812fb | 386 | |
88c6e37e | 387 | if (dp && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
7050d530 | 388 | { |
88c6e37e GM |
389 | charvec = DISP_CHAR_VECTOR (dp, c); |
390 | n = ASIZE (charvec); | |
7050d530 | 391 | } |
88c6e37e | 392 | else |
993b6404 | 393 | { |
88c6e37e GM |
394 | charvec = Qnil; |
395 | n = 1; | |
396 | } | |
097812fb | 397 | |
88c6e37e GM |
398 | for (i = n - 1; i >= 0; --i) |
399 | { | |
400 | if (VECTORP (charvec)) | |
401 | { | |
402 | /* This should be handled the same as | |
403 | next_element_from_display_vector does it. */ | |
404 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 405 | |
f59836fe KS |
406 | if (GLYPH_CODE_P (entry) |
407 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
408 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
409 | else |
410 | c = ' '; | |
411 | } | |
097812fb | 412 | |
88c6e37e GM |
413 | if (c >= 040 && c < 0177) |
414 | col++; | |
415 | else if (c == '\n' | |
416 | || (c == '\r' | |
4b4deea2 | 417 | && EQ (BVAR (current_buffer, selective_display), Qt))) |
88c6e37e GM |
418 | { |
419 | ptr++; | |
420 | goto start_of_line_found; | |
421 | } | |
422 | else if (c == '\t') | |
423 | { | |
424 | if (tab_seen) | |
425 | col = ((col + tab_width) / tab_width) * tab_width; | |
097812fb | 426 | |
88c6e37e GM |
427 | post_tab += col; |
428 | col = 0; | |
429 | tab_seen = 1; | |
430 | } | |
f1004faf GM |
431 | else if (VECTORP (charvec)) |
432 | /* With a display table entry, C is displayed as is, and | |
433 | not displayed as \NNN or as ^N. If C is a single-byte | |
434 | character, it takes one column. If C is multi-byte in | |
435 | an unibyte buffer, it's translated to unibyte, so it | |
436 | also takes one column. */ | |
437 | ++col; | |
88c6e37e GM |
438 | else |
439 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
993b6404 | 440 | } |
993b6404 JB |
441 | } |
442 | ||
88c6e37e GM |
443 | start_of_line_found: |
444 | ||
993b6404 JB |
445 | if (tab_seen) |
446 | { | |
447 | col = ((col + tab_width) / tab_width) * tab_width; | |
448 | col += post_tab; | |
449 | } | |
450 | ||
a997a7ca KH |
451 | if (ptr == BEGV_ADDR) |
452 | current_column_bol_cache = BEGV; | |
453 | else | |
fe0066f5 RS |
454 | current_column_bol_cache = BYTE_TO_CHAR (PTR_BYTE_POS (ptr)); |
455 | ||
993b6404 | 456 | last_known_column = col; |
6ec8bbd2 | 457 | last_known_column_point = PT; |
993b6404 JB |
458 | last_known_column_modified = MODIFF; |
459 | ||
460 | return col; | |
461 | } | |
462 | \f | |
80e3db56 SM |
463 | |
464 | /* Check the presence of a display property and compute its width. | |
465 | If a property was found and its width was found as well, return | |
466 | its width (>= 0) and set the position of the end of the property | |
467 | in ENDPOS. | |
468 | Otherwise just return -1. */ | |
469 | static int | |
470 | check_display_width (EMACS_INT pos, EMACS_INT col, EMACS_INT *endpos) | |
471 | { | |
472 | Lisp_Object val, overlay; | |
473 | ||
474 | if (CONSP (val = get_char_property_and_overlay | |
475 | (make_number (pos), Qdisplay, Qnil, &overlay)) | |
476 | && EQ (Qspace, XCAR (val))) | |
477 | { /* FIXME: Use calc_pixel_width_or_height, as in term.c. */ | |
478 | Lisp_Object plist = XCDR (val), prop; | |
479 | int width = -1; | |
480 | ||
481 | if ((prop = Fplist_get (plist, QCwidth), NATNUMP (prop))) | |
482 | width = XINT (prop); | |
483 | else if (FLOATP (prop)) | |
484 | width = (int)(XFLOAT_DATA (prop) + 0.5); | |
485 | else if ((prop = Fplist_get (plist, QCalign_to), NATNUMP (prop))) | |
486 | width = XINT (prop) - col; | |
487 | else if (FLOATP (prop)) | |
488 | width = (int)(XFLOAT_DATA (prop) + 0.5) - col; | |
409f2919 | 489 | |
80e3db56 SM |
490 | if (width >= 0) |
491 | { | |
492 | EMACS_INT start; | |
493 | if (OVERLAYP (overlay)) | |
494 | *endpos = OVERLAY_POSITION (OVERLAY_END (overlay)); | |
495 | else | |
496 | get_property_and_range (pos, Qdisplay, &val, &start, endpos, Qnil); | |
497 | return width; | |
498 | } | |
499 | } | |
500 | return -1; | |
501 | } | |
502 | ||
ef6f5c0e SM |
503 | /* Scanning from the beginning of the current line, stop at the buffer |
504 | position ENDPOS or at the column GOALCOL or at the end of line, whichever | |
505 | comes first. | |
506 | Return the resulting buffer position and column in ENDPOS and GOALCOL. | |
507 | PREVCOL gets set to the column of the previous position (it's always | |
508 | strictly smaller than the goal column). */ | |
509 | static void | |
510 | scan_for_column (EMACS_INT *endpos, EMACS_INT *goalcol, EMACS_INT *prevcol) | |
9a21bb64 | 511 | { |
4b4deea2 TT |
512 | register EMACS_INT tab_width = XINT (BVAR (current_buffer, tab_width)); |
513 | register int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow)); | |
9a21bb64 | 514 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
4b4deea2 | 515 | int multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters)); |
d6721dda | 516 | struct composition_it cmp_it; |
fc88345b KH |
517 | Lisp_Object window; |
518 | struct window *w; | |
9a21bb64 RS |
519 | |
520 | /* Start the scan at the beginning of this line with column number 0. */ | |
ef6f5c0e SM |
521 | register EMACS_INT col = 0, prev_col = 0; |
522 | EMACS_INT goal = goalcol ? *goalcol : MOST_POSITIVE_FIXNUM; | |
523 | EMACS_INT end = endpos ? *endpos : PT; | |
83155776 SM |
524 | EMACS_INT scan, scan_byte; |
525 | EMACS_INT next_boundary; | |
ef6f5c0e | 526 | { |
83155776 | 527 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
813b81b3 | 528 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); |
fe0066f5 RS |
529 | current_column_bol_cache = PT; |
530 | scan = PT, scan_byte = PT_BYTE; | |
531 | SET_PT_BOTH (opoint, opoint_byte); | |
532 | next_boundary = scan; | |
ef6f5c0e | 533 | } |
9a21bb64 | 534 | |
fc88345b KH |
535 | window = Fget_buffer_window (Fcurrent_buffer (), Qnil); |
536 | w = ! NILP (window) ? XWINDOW (window) : NULL; | |
537 | ||
9a21bb64 | 538 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
72af86bd | 539 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
540 | cmp_it.id = -1; |
541 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, Qnil); | |
9a21bb64 RS |
542 | |
543 | /* Scan forward to the target position. */ | |
ef6f5c0e | 544 | while (scan < end) |
9a21bb64 RS |
545 | { |
546 | int c; | |
547 | ||
548 | /* Occasionally we may need to skip invisible text. */ | |
549 | while (scan == next_boundary) | |
550 | { | |
ef6f5c0e | 551 | EMACS_INT old_scan = scan; |
9a21bb64 RS |
552 | /* This updates NEXT_BOUNDARY to the next place |
553 | where we might need to skip more invisible text. */ | |
ef6f5c0e | 554 | scan = skip_invisible (scan, &next_boundary, end, Qnil); |
fe0066f5 RS |
555 | if (scan != old_scan) |
556 | scan_byte = CHAR_TO_BYTE (scan); | |
ef6f5c0e SM |
557 | if (scan >= end) |
558 | goto endloop; | |
9a21bb64 RS |
559 | } |
560 | ||
ef6f5c0e SM |
561 | /* Test reaching the goal column. We do this after skipping |
562 | invisible characters, so that we put point before the | |
563 | character on which the cursor will appear. */ | |
564 | if (col >= goal) | |
565 | break; | |
566 | prev_col = col; | |
567 | ||
80e3db56 | 568 | { /* Check display property. */ |
85f24f61 PE |
569 | EMACS_INT endp; |
570 | int width = check_display_width (scan, col, &endp); | |
80e3db56 SM |
571 | if (width >= 0) |
572 | { | |
573 | col += width; | |
85f24f61 | 574 | if (endp > scan) /* Avoid infinite loops with 0-width overlays. */ |
80e3db56 | 575 | { |
85f24f61 | 576 | scan = endp; scan_byte = charpos_to_bytepos (scan); |
80e3db56 SM |
577 | continue; |
578 | } | |
579 | } | |
580 | } | |
581 | ||
d6721dda KH |
582 | /* Check composition sequence. */ |
583 | if (cmp_it.id >= 0 | |
584 | || (scan == cmp_it.stop_pos | |
585 | && composition_reseat_it (&cmp_it, scan, scan_byte, end, | |
fc88345b | 586 | w, NULL, Qnil))) |
d6721dda KH |
587 | composition_update_it (&cmp_it, scan, scan_byte, Qnil); |
588 | if (cmp_it.id >= 0) | |
589 | { | |
590 | scan += cmp_it.nchars; | |
591 | scan_byte += cmp_it.nbytes; | |
592 | if (scan <= end) | |
593 | col += cmp_it.width; | |
594 | if (cmp_it.to == cmp_it.nglyphs) | |
595 | { | |
596 | cmp_it.id = -1; | |
597 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, | |
598 | Qnil); | |
599 | } | |
600 | else | |
601 | cmp_it.from = cmp_it.to; | |
602 | continue; | |
603 | } | |
604 | ||
813b81b3 | 605 | c = FETCH_BYTE (scan_byte); |
88c6e37e | 606 | |
ef6f5c0e SM |
607 | /* See if there is a display table and it relates |
608 | to this character. */ | |
609 | ||
c9c0f7cf | 610 | if (dp != 0 |
409f2919 | 611 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 612 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
9a21bb64 | 613 | { |
d6e483a4 RS |
614 | Lisp_Object charvec; |
615 | EMACS_INT i, n; | |
616 | ||
617 | /* This character is displayed using a vector of glyphs. | |
ef6f5c0e | 618 | Update the column/position based on those glyphs. */ |
d6e483a4 | 619 | |
88c6e37e GM |
620 | charvec = DISP_CHAR_VECTOR (dp, c); |
621 | n = ASIZE (charvec); | |
88c6e37e | 622 | |
d6e483a4 | 623 | for (i = 0; i < n; i++) |
88c6e37e GM |
624 | { |
625 | /* This should be handled the same as | |
626 | next_element_from_display_vector does it. */ | |
f59836fe | 627 | Lisp_Object entry = AREF (charvec, i); |
d6e483a4 | 628 | |
f59836fe KS |
629 | if (GLYPH_CODE_P (entry) |
630 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
631 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
632 | else |
633 | c = ' '; | |
d6e483a4 RS |
634 | |
635 | if (c == '\n') | |
636 | goto endloop; | |
4b4deea2 | 637 | if (c == '\r' && EQ (BVAR (current_buffer, selective_display), Qt)) |
d6e483a4 RS |
638 | goto endloop; |
639 | if (c == '\t') | |
640 | { | |
d6e483a4 RS |
641 | col += tab_width; |
642 | col = col / tab_width * tab_width; | |
643 | } | |
644 | else | |
645 | ++col; | |
88c6e37e | 646 | } |
d6e483a4 RS |
647 | } |
648 | else | |
649 | { | |
ef6f5c0e SM |
650 | /* The display table doesn't affect this character; |
651 | it displays as itself. */ | |
d6e483a4 | 652 | |
88c6e37e GM |
653 | if (c == '\n') |
654 | goto endloop; | |
4b4deea2 | 655 | if (c == '\r' && EQ (BVAR (current_buffer, selective_display), Qt)) |
88c6e37e | 656 | goto endloop; |
88c6e37e GM |
657 | if (c == '\t') |
658 | { | |
88c6e37e GM |
659 | col += tab_width; |
660 | col = col / tab_width * tab_width; | |
661 | } | |
409f2919 | 662 | else if (multibyte && LEADING_CODE_P (c)) |
88c6e37e | 663 | { |
ef6f5c0e | 664 | /* Start of multi-byte form. */ |
88c6e37e | 665 | unsigned char *ptr; |
c59478bc | 666 | int bytes, width; |
097812fb | 667 | |
88c6e37e | 668 | ptr = BYTE_POS_ADDR (scan_byte); |
85f24f61 | 669 | MULTIBYTE_BYTES_WIDTH (ptr, dp, bytes, width); |
36974b5e RS |
670 | /* Subtract one to compensate for the increment |
671 | that is going to happen below. */ | |
ef6f5c0e | 672 | scan_byte += bytes - 1; |
88c6e37e GM |
673 | col += width; |
674 | } | |
675 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
676 | col += 2; | |
677 | else if (c < 040 || c >= 0177) | |
678 | col += 4; | |
679 | else | |
680 | col++; | |
a997a7ca | 681 | } |
d6e483a4 RS |
682 | scan++; |
683 | scan_byte++; | |
684 | ||
9a21bb64 RS |
685 | } |
686 | endloop: | |
687 | ||
688 | last_known_column = col; | |
6ec8bbd2 | 689 | last_known_column_point = PT; |
9a21bb64 RS |
690 | last_known_column_modified = MODIFF; |
691 | ||
ef6f5c0e SM |
692 | if (goalcol) |
693 | *goalcol = col; | |
694 | if (endpos) | |
695 | *endpos = scan; | |
696 | if (prevcol) | |
697 | *prevcol = prev_col; | |
698 | } | |
699 | ||
700 | /* Return the column number of position POS | |
701 | by scanning forward from the beginning of the line. | |
702 | This function handles characters that are invisible | |
703 | due to text properties or overlays. */ | |
704 | ||
7831777b | 705 | static EMACS_INT |
971de7fb | 706 | current_column_1 (void) |
ef6f5c0e SM |
707 | { |
708 | EMACS_INT col = MOST_POSITIVE_FIXNUM; | |
709 | EMACS_INT opoint = PT; | |
710 | ||
711 | scan_for_column (&opoint, &col, NULL); | |
9a21bb64 RS |
712 | return col; |
713 | } | |
714 | \f | |
f4a6687d GM |
715 | |
716 | #if 0 /* Not used. */ | |
717 | ||
c412c808 RS |
718 | /* Return the width in columns of the part of STRING from BEG to END. |
719 | If BEG is nil, that stands for the beginning of STRING. | |
720 | If END is nil, that stands for the end of STRING. */ | |
721 | ||
76e20cb0 | 722 | static double |
382ac0bd | 723 | string_display_width (string, beg, end) |
c412c808 RS |
724 | Lisp_Object string, beg, end; |
725 | { | |
726 | register int col; | |
727 | register unsigned char *ptr, *stop; | |
728 | register int tab_seen; | |
729 | int post_tab; | |
730 | register int c; | |
731 | register int tab_width = XINT (current_buffer->tab_width); | |
732 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); | |
d44f12b4 | 733 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
c412c808 RS |
734 | int b, e; |
735 | ||
736 | if (NILP (end)) | |
d5db4077 | 737 | e = SCHARS (string); |
c412c808 RS |
738 | else |
739 | { | |
b7826503 | 740 | CHECK_NUMBER (end); |
c412c808 RS |
741 | e = XINT (end); |
742 | } | |
743 | ||
744 | if (NILP (beg)) | |
745 | b = 0; | |
746 | else | |
747 | { | |
b7826503 | 748 | CHECK_NUMBER (beg); |
c412c808 RS |
749 | b = XINT (beg); |
750 | } | |
751 | ||
752 | /* Make a pointer for decrementing through the chars before point. */ | |
d5db4077 | 753 | ptr = SDATA (string) + e; |
c412c808 RS |
754 | /* Make a pointer to where consecutive chars leave off, |
755 | going backwards from point. */ | |
d5db4077 | 756 | stop = SDATA (string) + b; |
c412c808 RS |
757 | |
758 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
759 | ||
760 | col = 0, tab_seen = 0, post_tab = 0; | |
761 | ||
762 | while (1) | |
763 | { | |
764 | if (ptr == stop) | |
765 | break; | |
766 | ||
767 | c = *--ptr; | |
768 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
77b37c05 | 769 | col += ASIZE (DISP_CHAR_VECTOR (dp, c)); |
c412c808 RS |
770 | else if (c >= 040 && c < 0177) |
771 | col++; | |
772 | else if (c == '\n') | |
773 | break; | |
774 | else if (c == '\t') | |
775 | { | |
776 | if (tab_seen) | |
777 | col = ((col + tab_width) / tab_width) * tab_width; | |
778 | ||
779 | post_tab += col; | |
780 | col = 0; | |
781 | tab_seen = 1; | |
782 | } | |
783 | else | |
784 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
785 | } | |
786 | ||
787 | if (tab_seen) | |
788 | { | |
789 | col = ((col + tab_width) / tab_width) * tab_width; | |
790 | col += post_tab; | |
791 | } | |
792 | ||
793 | return col; | |
794 | } | |
f4a6687d GM |
795 | |
796 | #endif /* 0 */ | |
797 | ||
c412c808 | 798 | \f |
a7ca3326 | 799 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
8c1a1077 | 800 | doc: /* Indent from point with tabs and spaces until COLUMN is reached. |
7bf120f1 | 801 | Optional second argument MINIMUM says always do at least MINIMUM spaces |
f64f035e EZ |
802 | even if that goes past COLUMN; by default, MINIMUM is zero. |
803 | ||
804 | The return value is COLUMN. */) | |
5842a27b | 805 | (Lisp_Object column, Lisp_Object minimum) |
993b6404 | 806 | { |
7831777b PE |
807 | EMACS_INT mincol; |
808 | register EMACS_INT fromcol; | |
809 | register EMACS_INT tab_width = XINT (BVAR (current_buffer, tab_width)); | |
993b6404 | 810 | |
b7826503 | 811 | CHECK_NUMBER (column); |
56a98455 | 812 | if (NILP (minimum)) |
94d92e9c | 813 | XSETFASTINT (minimum, 0); |
b7826503 | 814 | CHECK_NUMBER (minimum); |
993b6404 JB |
815 | |
816 | fromcol = current_column (); | |
817 | mincol = fromcol + XINT (minimum); | |
04c98432 | 818 | if (mincol < XINT (column)) mincol = XINT (column); |
993b6404 JB |
819 | |
820 | if (fromcol == mincol) | |
821 | return make_number (mincol); | |
822 | ||
ccdcf1f5 | 823 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
824 | |
825 | if (indent_tabs_mode) | |
826 | { | |
827 | Lisp_Object n; | |
94d92e9c | 828 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
829 | if (XFASTINT (n) != 0) |
830 | { | |
6d1bd1a5 | 831 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
832 | |
833 | fromcol = (mincol / tab_width) * tab_width; | |
834 | } | |
835 | } | |
836 | ||
04c98432 EN |
837 | XSETFASTINT (column, mincol - fromcol); |
838 | Finsert_char (make_number (' '), column, Qt); | |
993b6404 JB |
839 | |
840 | last_known_column = mincol; | |
6ec8bbd2 | 841 | last_known_column_point = PT; |
993b6404 JB |
842 | last_known_column_modified = MODIFF; |
843 | ||
04c98432 EN |
844 | XSETINT (column, mincol); |
845 | return column; | |
993b6404 | 846 | } |
0aa01123 | 847 | |
993b6404 JB |
848 | \f |
849 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, | |
8c1a1077 PJ |
850 | 0, 0, 0, |
851 | doc: /* Return the indentation of the current line. | |
852 | This is the horizontal position of the character | |
853 | following any initial whitespace. */) | |
5842a27b | 854 | (void) |
993b6404 JB |
855 | { |
856 | Lisp_Object val; | |
5816888b | 857 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
fe0066f5 RS |
858 | |
859 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); | |
993b6404 | 860 | |
7831777b | 861 | XSETFASTINT (val, position_indentation (PT_BYTE)); |
fe0066f5 | 862 | SET_PT_BOTH (opoint, opoint_byte); |
993b6404 JB |
863 | return val; |
864 | } | |
865 | ||
7831777b | 866 | static EMACS_INT |
971de7fb | 867 | position_indentation (register int pos_byte) |
993b6404 | 868 | { |
83155776 | 869 | register EMACS_INT column = 0; |
4b4deea2 | 870 | register EMACS_INT tab_width = XINT (BVAR (current_buffer, tab_width)); |
993b6404 JB |
871 | register unsigned char *p; |
872 | register unsigned char *stop; | |
9a21bb64 | 873 | unsigned char *start; |
83155776 SM |
874 | EMACS_INT next_boundary_byte = pos_byte; |
875 | EMACS_INT ceiling = next_boundary_byte; | |
2ff4775b | 876 | |
ccdcf1f5 | 877 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
2ff4775b | 878 | |
fe0066f5 | 879 | p = BYTE_POS_ADDR (pos_byte); |
9a21bb64 RS |
880 | /* STOP records the value of P at which we will need |
881 | to think about the gap, or about invisible text, | |
882 | or about the end of the buffer. */ | |
883 | stop = p; | |
884 | /* START records the starting value of P. */ | |
885 | start = p; | |
993b6404 JB |
886 | while (1) |
887 | { | |
888 | while (p == stop) | |
889 | { | |
83155776 | 890 | EMACS_INT stop_pos_byte; |
9a21bb64 | 891 | |
fe0066f5 RS |
892 | /* If we have updated P, set POS_BYTE to match. |
893 | The first time we enter the loop, POS_BYTE is already right. */ | |
9a21bb64 | 894 | if (p != start) |
fe0066f5 | 895 | pos_byte = PTR_BYTE_POS (p); |
9a21bb64 | 896 | /* Consider the various reasons STOP might have been set here. */ |
fe0066f5 | 897 | if (pos_byte == ZV_BYTE) |
993b6404 | 898 | return column; |
fe0066f5 RS |
899 | if (pos_byte == next_boundary_byte) |
900 | { | |
83155776 SM |
901 | EMACS_INT next_boundary; |
902 | EMACS_INT pos = BYTE_TO_CHAR (pos_byte); | |
fe0066f5 RS |
903 | pos = skip_invisible (pos, &next_boundary, ZV, Qnil); |
904 | pos_byte = CHAR_TO_BYTE (pos); | |
905 | next_boundary_byte = CHAR_TO_BYTE (next_boundary); | |
906 | } | |
907 | if (pos_byte >= ceiling) | |
908 | ceiling = BUFFER_CEILING_OF (pos_byte) + 1; | |
9a21bb64 RS |
909 | /* Compute the next place we need to stop and think, |
910 | and set STOP accordingly. */ | |
fe0066f5 | 911 | stop_pos_byte = min (ceiling, next_boundary_byte); |
9a21bb64 | 912 | /* The -1 and +1 arrange to point at the first byte of gap |
fe0066f5 | 913 | (if STOP_POS_BYTE is the position of the gap) |
9a21bb64 | 914 | rather than at the data after the gap. */ |
097812fb | 915 | |
fe0066f5 RS |
916 | stop = BYTE_POS_ADDR (stop_pos_byte - 1) + 1; |
917 | p = BYTE_POS_ADDR (pos_byte); | |
993b6404 JB |
918 | } |
919 | switch (*p++) | |
920 | { | |
fb911777 | 921 | case 0240: |
4b4deea2 | 922 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
fb911777 | 923 | return column; |
993b6404 JB |
924 | case ' ': |
925 | column++; | |
926 | break; | |
927 | case '\t': | |
928 | column += tab_width - column % tab_width; | |
929 | break; | |
930 | default: | |
fb911777 | 931 | if (ASCII_BYTE_P (p[-1]) |
4b4deea2 | 932 | || NILP (BVAR (current_buffer, enable_multibyte_characters))) |
fb911777 KH |
933 | return column; |
934 | { | |
fe0066f5 RS |
935 | int c; |
936 | pos_byte = PTR_BYTE_POS (p - 1); | |
937 | c = FETCH_MULTIBYTE_CHAR (pos_byte); | |
fb911777 KH |
938 | if (CHAR_HAS_CATEGORY (c, ' ')) |
939 | { | |
940 | column++; | |
fe0066f5 RS |
941 | INC_POS (pos_byte); |
942 | p = BYTE_POS_ADDR (pos_byte); | |
fb911777 KH |
943 | } |
944 | else | |
945 | return column; | |
946 | } | |
993b6404 JB |
947 | } |
948 | } | |
949 | } | |
1b15e576 KH |
950 | |
951 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
952 | Blank lines are treated as if they had the same indentation as the | |
953 | preceding line. */ | |
fe0066f5 | 954 | |
1b15e576 | 955 | int |
7831777b | 956 | indented_beyond_p (EMACS_INT pos, EMACS_INT pos_byte, EMACS_INT column) |
1b15e576 | 957 | { |
7831777b | 958 | EMACS_INT val; |
5816888b | 959 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
fe0066f5 RS |
960 | |
961 | SET_PT_BOTH (pos, pos_byte); | |
962 | while (PT > BEGV && FETCH_BYTE (PT_BYTE) == '\n') | |
963 | scan_newline (PT - 1, PT_BYTE - 1, BEGV, BEGV_BYTE, -1, 0); | |
964 | ||
d5d6f706 | 965 | val = position_indentation (PT_BYTE); |
fe0066f5 | 966 | SET_PT_BOTH (opoint, opoint_byte); |
7831777b | 967 | return val >= column; |
1b15e576 | 968 | } |
993b6404 | 969 | \f |
a7ca3326 | 970 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, "p", |
8c1a1077 | 971 | doc: /* Move point to column COLUMN in the current line. |
3c860543 | 972 | Interactively, COLUMN is the value of prefix numeric argument. |
8c1a1077 PJ |
973 | The column of a character is calculated by adding together the widths |
974 | as displayed of the previous characters in the line. | |
975 | This function ignores line-continuation; | |
976 | there is no upper limit on the column number a character can have | |
977 | and horizontal scrolling has no effect. | |
978 | ||
979 | If specified column is within a character, point goes after that character. | |
980 | If it's past end of line, point goes to end of line. | |
981 | ||
3c860543 EZ |
982 | Optional second argument FORCE non-nil means if COLUMN is in the |
983 | middle of a tab character, change it to spaces. | |
984 | In addition, if FORCE is t, and the line is too short to reach | |
985 | COLUMN, add spaces/tabs to get there. | |
8c1a1077 PJ |
986 | |
987 | The return value is the current column. */) | |
5842a27b | 988 | (Lisp_Object column, Lisp_Object force) |
993b6404 | 989 | { |
ef6f5c0e SM |
990 | EMACS_INT pos; |
991 | EMACS_INT col, prev_col; | |
992 | EMACS_INT goal; | |
fe0066f5 | 993 | |
b7826503 | 994 | CHECK_NATNUM (column); |
993b6404 JB |
995 | goal = XINT (column); |
996 | ||
ef6f5c0e SM |
997 | col = goal; |
998 | pos = ZV; | |
999 | scan_for_column (&pos, &col, &prev_col); | |
993b6404 | 1000 | |
ef6f5c0e | 1001 | SET_PT (pos); |
4c669c09 | 1002 | |
ef6f5c0e SM |
1003 | /* If a tab char made us overshoot, change it to spaces |
1004 | and scan through it again. */ | |
1005 | if (!NILP (force) && col > goal) | |
993b6404 | 1006 | { |
4c92f429 | 1007 | int c; |
ef6f5c0e | 1008 | EMACS_INT pos_byte = PT_BYTE; |
d6e483a4 | 1009 | |
4c92f429 AS |
1010 | DEC_POS (pos_byte); |
1011 | c = FETCH_CHAR (pos_byte); | |
ef6f5c0e | 1012 | if (c == '\t' && prev_col < goal) |
d6e483a4 | 1013 | { |
ef6f5c0e SM |
1014 | EMACS_INT goal_pt, goal_pt_byte; |
1015 | ||
1016 | /* Insert spaces in front of the tab to reach GOAL. Do this | |
1017 | first so that a marker at the end of the tab gets | |
1018 | adjusted. */ | |
1019 | SET_PT_BOTH (PT - 1, PT_BYTE - 1); | |
1020 | Finsert_char (make_number (' '), make_number (goal - prev_col), Qt); | |
1021 | ||
1022 | /* Now delete the tab, and indent to COL. */ | |
1023 | del_range (PT, PT + 1); | |
1024 | goal_pt = PT; | |
1025 | goal_pt_byte = PT_BYTE; | |
1026 | Findent_to (make_number (col), Qnil); | |
1027 | SET_PT_BOTH (goal_pt, goal_pt_byte); | |
1028 | ||
1029 | /* Set the last_known... vars consistently. */ | |
1030 | col = goal; | |
a997a7ca | 1031 | } |
993b6404 JB |
1032 | } |
1033 | ||
1034 | /* If line ends prematurely, add space to the end. */ | |
de4075cf | 1035 | if (col < goal && EQ (force, Qt)) |
230a4cbd | 1036 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
1037 | |
1038 | last_known_column = col; | |
6ec8bbd2 | 1039 | last_known_column_point = PT; |
993b6404 JB |
1040 | last_known_column_modified = MODIFF; |
1041 | ||
ef6f5c0e | 1042 | return make_number (col); |
993b6404 JB |
1043 | } |
1044 | \f | |
0aa01123 JB |
1045 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
1046 | ||
9306c32e | 1047 | static struct position val_compute_motion; |
993b6404 JB |
1048 | |
1049 | /* Scan the current buffer forward from offset FROM, pretending that | |
1050 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
1051 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
1052 | and return the ending buffer position and screen location. If we |
1053 | can't hit the requested column exactly (because of a tab or other | |
1054 | multi-column character), overshoot. | |
993b6404 | 1055 | |
2ab90d49 KH |
1056 | DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings |
1057 | at FROM. This is the case if FROMVPOS and FROMVPOS came from an | |
1058 | earlier call to compute_motion. The other common case is that FROMHPOS | |
1059 | is zero and FROM is a position that "belongs" at column zero, but might | |
1060 | be shifted by overlay strings; in this case DID_MOTION should be 0. | |
1061 | ||
993b6404 JB |
1062 | WIDTH is the number of columns available to display text; |
1063 | compute_motion uses this to handle continuation lines and such. | |
361f14bf KS |
1064 | If WIDTH is -1, use width of window's text area adjusted for |
1065 | continuation glyph when needed. | |
1066 | ||
993b6404 JB |
1067 | HSCROLL is the number of columns not being displayed at the left |
1068 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
1069 | TAB_OFFSET is the number of columns of the first tab that aren't |
1070 | being displayed, perhaps because of a continuation line or | |
1071 | something. | |
993b6404 JB |
1072 | |
1073 | compute_motion returns a pointer to a struct position. The bufpos | |
1074 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
1075 | and vpos give its cartesian location. prevhpos is the column at |
1076 | which the character before bufpos started, and contin is non-zero | |
1077 | if we reached the current line by continuing the previous. | |
1078 | ||
1079 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
1080 | columns, taking HSCROLL and the truncation glyph at the left margin | |
1081 | into account. That is, beginning-of-line moves you to the hpos | |
1082 | -HSCROLL + (HSCROLL > 0). | |
993b6404 JB |
1083 | |
1084 | For example, to find the buffer position of column COL of line LINE | |
1085 | of a certain window, pass the window's starting location as FROM | |
1086 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
1087 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
1088 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
2ff4775b | 1089 | TOHPOS. |
993b6404 JB |
1090 | |
1091 | When displaying in window w, a typical formula for WIDTH is: | |
1092 | ||
1093 | window_width - 1 | |
a3c87d4e | 1094 | - (has_vertical_scroll_bars |
90022f5a KS |
1095 | ? WINDOW_CONFIG_SCROLL_BAR_COLS (window) |
1096 | : (window_width + window_left != frame_cols)) | |
993b6404 JB |
1097 | |
1098 | where | |
90022f5a KS |
1099 | window_width is XFASTINT (w->total_cols), |
1100 | window_left is XFASTINT (w->left_col), | |
a3c87d4e | 1101 | has_vertical_scroll_bars is |
90022f5a KS |
1102 | WINDOW_HAS_VERTICAL_SCROLL_BAR (window) |
1103 | and frame_cols = FRAME_COLS (XFRAME (window->frame)) | |
993b6404 | 1104 | |
abde8f8c MR |
1105 | Or you can let window_body_cols do this all for you, and write: |
1106 | window_body_cols (w) - 1 | |
fa61c701 JB |
1107 | |
1108 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 1109 | accounts for window borders if the window is split horizontally, and |
1827d036 | 1110 | the scroll bars if they are turned on. */ |
993b6404 JB |
1111 | |
1112 | struct position * | |
971de7fb | 1113 | 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 | 1114 | { |
83155776 SM |
1115 | register EMACS_INT hpos = fromhpos; |
1116 | register EMACS_INT vpos = fromvpos; | |
cde9337b | 1117 | |
83155776 SM |
1118 | register EMACS_INT pos; |
1119 | EMACS_INT pos_byte; | |
6bbd7a29 | 1120 | register int c = 0; |
4b4deea2 TT |
1121 | register EMACS_INT tab_width = XFASTINT (BVAR (current_buffer, tab_width)); |
1122 | register int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow)); | |
d44f12b4 | 1123 | register struct Lisp_Char_Table *dp = window_display_table (win); |
7831777b | 1124 | EMACS_INT selective |
4b4deea2 TT |
1125 | = (INTEGERP (BVAR (current_buffer, selective_display)) |
1126 | ? XINT (BVAR (current_buffer, selective_display)) | |
1127 | : !NILP (BVAR (current_buffer, selective_display)) ? -1 : 0); | |
993b6404 | 1128 | int selective_rlen |
eeaafd4f | 1129 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
77b37c05 | 1130 | ? ASIZE (DISP_INVIS_VECTOR (dp)) : 0); |
2ab90d49 KH |
1131 | /* The next location where the `invisible' property changes, or an |
1132 | overlay starts or ends. */ | |
83155776 | 1133 | EMACS_INT next_boundary = from; |
993b6404 | 1134 | |
0aa01123 JB |
1135 | /* For computing runs of characters with similar widths. |
1136 | Invariant: width_run_width is zero, or all the characters | |
2ff4775b | 1137 | from width_run_start to width_run_end have a fixed width of |
0aa01123 | 1138 | width_run_width. */ |
83155776 SM |
1139 | EMACS_INT width_run_start = from; |
1140 | EMACS_INT width_run_end = from; | |
1141 | EMACS_INT width_run_width = 0; | |
0aa01123 | 1142 | Lisp_Object *width_table; |
66c75ca5 | 1143 | Lisp_Object buffer; |
0aa01123 JB |
1144 | |
1145 | /* The next buffer pos where we should consult the width run cache. */ | |
83155776 | 1146 | EMACS_INT next_width_run = from; |
0e435804 | 1147 | Lisp_Object window; |
0aa01123 | 1148 | |
4b4deea2 | 1149 | int multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters)); |
c71c19f4 RS |
1150 | /* If previous char scanned was a wide character, |
1151 | this is the column where it ended. Otherwise, this is 0. */ | |
83155776 SM |
1152 | EMACS_INT wide_column_end_hpos = 0; |
1153 | EMACS_INT prev_pos; /* Previous buffer position. */ | |
1154 | EMACS_INT prev_pos_byte; /* Previous buffer position. */ | |
1155 | EMACS_INT prev_hpos = 0; | |
1156 | EMACS_INT prev_vpos = 0; | |
1157 | EMACS_INT contin_hpos; /* HPOS of last column of continued line. */ | |
1158 | EMACS_INT prev_tab_offset; /* Previous tab offset. */ | |
1159 | EMACS_INT continuation_glyph_width; | |
a997a7ca | 1160 | |
d6721dda KH |
1161 | struct composition_it cmp_it; |
1162 | ||
66c75ca5 | 1163 | XSETBUFFER (buffer, current_buffer); |
0e435804 | 1164 | XSETWINDOW (window, win); |
66c75ca5 | 1165 | |
0aa01123 JB |
1166 | width_run_cache_on_off (); |
1167 | if (dp == buffer_display_table ()) | |
4b4deea2 TT |
1168 | width_table = (VECTORP (BVAR (current_buffer, width_table)) |
1169 | ? XVECTOR (BVAR (current_buffer, width_table))->contents | |
0aa01123 JB |
1170 | : 0); |
1171 | else | |
1172 | /* If the window has its own display table, we can't use the width | |
1173 | run cache, because that's based on the buffer's display table. */ | |
1174 | width_table = 0; | |
1175 | ||
e4500116 GM |
1176 | if (tab_width <= 0 || tab_width > 1000) |
1177 | tab_width = 8; | |
1178 | ||
361f14bf KS |
1179 | /* Negative width means use all available text columns. */ |
1180 | if (width < 0) | |
1181 | { | |
abde8f8c | 1182 | width = window_body_cols (win); |
361f14bf KS |
1183 | /* We must make room for continuation marks if we don't have fringes. */ |
1184 | #ifdef HAVE_WINDOW_SYSTEM | |
1185 | if (!FRAME_WINDOW_P (XFRAME (win->frame))) | |
1186 | #endif | |
1187 | width -= 1; | |
1188 | } | |
1189 | ||
8cc08515 | 1190 | continuation_glyph_width = 1; |
ed5c373c | 1191 | #ifdef HAVE_WINDOW_SYSTEM |
8cc08515 KS |
1192 | if (FRAME_WINDOW_P (XFRAME (win->frame))) |
1193 | continuation_glyph_width = 0; /* In the fringe. */ | |
ed5c373c KS |
1194 | #endif |
1195 | ||
e4500116 GM |
1196 | immediate_quit = 1; |
1197 | QUIT; | |
cde9337b | 1198 | |
a997a7ca | 1199 | pos = prev_pos = from; |
fe0066f5 | 1200 | pos_byte = prev_pos_byte = CHAR_TO_BYTE (from); |
a997a7ca KH |
1201 | contin_hpos = 0; |
1202 | prev_tab_offset = tab_offset; | |
72af86bd | 1203 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
1204 | cmp_it.id = -1; |
1205 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, Qnil); | |
1206 | ||
2ab90d49 KH |
1207 | while (1) |
1208 | { | |
1209 | while (pos == next_boundary) | |
f75c0f8a | 1210 | { |
83155776 SM |
1211 | EMACS_INT pos_here = pos; |
1212 | EMACS_INT newpos; | |
98136db3 | 1213 | |
f9ba10b0 | 1214 | /* Don't skip invisible if we are already at the margin. */ |
8a00d895 | 1215 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
f9ba10b0 RS |
1216 | { |
1217 | if (contin_hpos && prev_hpos == 0 | |
1218 | && hpos > tohpos | |
1219 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
1220 | { /* Line breaks because we can't put the character at the | |
1221 | previous line any more. It is not the multi-column | |
1222 | character continued in middle. Go back to previous | |
1223 | buffer position, screen position, and set tab offset | |
1224 | to previous value. It's the beginning of the | |
1225 | line. */ | |
1226 | pos = prev_pos; | |
1227 | pos_byte = prev_pos_byte; | |
1228 | hpos = prev_hpos; | |
6b61353c | 1229 | vpos = prev_vpos; |
f9ba10b0 RS |
1230 | tab_offset = prev_tab_offset; |
1231 | } | |
1232 | break; | |
1233 | } | |
1234 | ||
2ab90d49 KH |
1235 | /* If the caller says that the screen position came from an earlier |
1236 | call to compute_motion, then we've already accounted for the | |
1237 | overlay strings at point. This is only true the first time | |
1238 | through, so clear the flag after testing it. */ | |
1239 | if (!did_motion) | |
1240 | /* We need to skip past the overlay strings. Currently those | |
a997a7ca | 1241 | strings must not contain TAB; |
2ab90d49 KH |
1242 | if we want to relax that restriction, something will have |
1243 | to be changed here. */ | |
a997a7ca KH |
1244 | { |
1245 | unsigned char *ovstr; | |
5816888b | 1246 | EMACS_INT ovlen = overlay_strings (pos, win, &ovstr); |
4116deee | 1247 | hpos += ((multibyte && ovlen > 0) |
7469ef5d | 1248 | ? strwidth ((char *) ovstr, ovlen) : ovlen); |
a997a7ca | 1249 | } |
2ab90d49 KH |
1250 | did_motion = 0; |
1251 | ||
1252 | if (pos >= to) | |
1253 | break; | |
66c75ca5 | 1254 | |
9a21bb64 RS |
1255 | /* Advance POS past invisible characters |
1256 | (but not necessarily all that there are here), | |
1257 | and store in next_boundary the next position where | |
1258 | we need to call skip_invisible. */ | |
98136db3 RS |
1259 | newpos = skip_invisible (pos, &next_boundary, to, window); |
1260 | ||
1261 | if (newpos >= to) | |
e8cb089b RS |
1262 | { |
1263 | pos = min (to, newpos); | |
bcfbd63d | 1264 | pos_byte = CHAR_TO_BYTE (pos); |
e8cb089b RS |
1265 | goto after_loop; |
1266 | } | |
98136db3 | 1267 | |
fe0066f5 RS |
1268 | if (newpos != pos_here) |
1269 | { | |
1270 | pos = newpos; | |
1271 | pos_byte = CHAR_TO_BYTE (pos); | |
1272 | } | |
f75c0f8a | 1273 | } |
2ab90d49 KH |
1274 | |
1275 | /* Handle right margin. */ | |
a997a7ca KH |
1276 | /* Note on a wide-column character. |
1277 | ||
1278 | Characters are classified into the following three categories | |
1279 | according to the width (columns occupied on screen). | |
1280 | ||
1281 | (1) single-column character: ex. `a' | |
1282 | (2) multi-column character: ex. `^A', TAB, `\033' | |
1283 | (3) wide-column character: ex. Japanese character, Chinese character | |
1284 | (In the following example, `W_' stands for them.) | |
1285 | ||
1286 | Multi-column characters can be divided around the right margin, | |
1287 | but wide-column characters cannot. | |
1288 | ||
1289 | NOTE: | |
1290 | ||
1291 | (*) The cursor is placed on the next character after the point. | |
1292 | ||
1293 | ---------- | |
1294 | abcdefghi\ | |
1295 | j ^---- next after the point | |
1296 | ^--- next char. after the point. | |
1297 | ---------- | |
1298 | In case of sigle-column character | |
1299 | ||
1300 | ---------- | |
1301 | abcdefgh\\ | |
1302 | 033 ^---- next after the point, next char. after the point. | |
1303 | ---------- | |
1304 | In case of multi-column character | |
1305 | ||
1306 | ---------- | |
1307 | abcdefgh\\ | |
1308 | W_ ^---- next after the point | |
1309 | ^---- next char. after the point. | |
1310 | ---------- | |
097812fb | 1311 | In case of wide-column character |
a997a7ca KH |
1312 | |
1313 | The problem here is continuation at a wide-column character. | |
1314 | In this case, the line may shorter less than WIDTH. | |
1315 | And we find the continuation AFTER it occurs. | |
1316 | ||
1317 | */ | |
1318 | ||
1319 | if (hpos > width) | |
2ab90d49 | 1320 | { |
81b6a665 CY |
1321 | int total_width = width + continuation_glyph_width; |
1322 | int truncate = 0; | |
1323 | ||
1324 | if (!NILP (Vtruncate_partial_width_windows) | |
1325 | && (total_width < FRAME_COLS (XFRAME (WINDOW_FRAME (win))))) | |
1326 | { | |
1327 | if (INTEGERP (Vtruncate_partial_width_windows)) | |
1328 | truncate | |
1329 | = total_width < XFASTINT (Vtruncate_partial_width_windows); | |
1330 | else | |
1331 | truncate = 1; | |
1332 | } | |
1333 | ||
1334 | if (hscroll || truncate | |
4b4deea2 | 1335 | || !NILP (BVAR (current_buffer, truncate_lines))) |
2ab90d49 | 1336 | { |
529724fe AS |
1337 | /* Truncating: skip to newline, unless we are already past |
1338 | TO (we need to go back below). */ | |
1339 | if (pos <= to) | |
fe0066f5 RS |
1340 | { |
1341 | pos = find_before_next_newline (pos, to, 1); | |
1342 | pos_byte = CHAR_TO_BYTE (pos); | |
529724fe AS |
1343 | hpos = width; |
1344 | /* If we just skipped next_boundary, | |
1345 | loop around in the main while | |
1346 | and handle it. */ | |
1347 | if (pos >= next_boundary) | |
1348 | next_boundary = pos + 1; | |
1349 | prev_hpos = width; | |
6b61353c | 1350 | prev_vpos = vpos; |
529724fe | 1351 | prev_tab_offset = tab_offset; |
fe0066f5 | 1352 | } |
2ab90d49 KH |
1353 | } |
1354 | else | |
1355 | { | |
1356 | /* Continuing. */ | |
a997a7ca KH |
1357 | /* Remember the previous value. */ |
1358 | prev_tab_offset = tab_offset; | |
1359 | ||
c9c0f7cf | 1360 | if (wide_column_end_hpos > width) |
a997a7ca KH |
1361 | { |
1362 | hpos -= prev_hpos; | |
1363 | tab_offset += prev_hpos; | |
1364 | } | |
1365 | else | |
1366 | { | |
1367 | tab_offset += width; | |
1368 | hpos -= width; | |
1369 | } | |
1370 | vpos++; | |
1371 | contin_hpos = prev_hpos; | |
1372 | prev_hpos = 0; | |
6cbc951e | 1373 | prev_vpos = vpos; |
2ab90d49 KH |
1374 | } |
1375 | } | |
1376 | ||
1377 | /* Stop if past the target buffer position or screen position. */ | |
33fe7d20 | 1378 | if (pos > to) |
a997a7ca KH |
1379 | { |
1380 | /* Go back to the previous position. */ | |
1381 | pos = prev_pos; | |
fe0066f5 | 1382 | pos_byte = prev_pos_byte; |
a997a7ca | 1383 | hpos = prev_hpos; |
6b61353c | 1384 | vpos = prev_vpos; |
a997a7ca KH |
1385 | tab_offset = prev_tab_offset; |
1386 | ||
1387 | /* NOTE on contin_hpos, hpos, and prev_hpos. | |
1388 | ||
1389 | ---------- | |
1390 | abcdefgh\\ | |
1391 | W_ ^---- contin_hpos | |
1392 | | ^----- hpos | |
1393 | \---- prev_hpos | |
1394 | ---------- | |
1395 | */ | |
1396 | ||
1397 | if (contin_hpos && prev_hpos == 0 | |
c9c0f7cf | 1398 | && contin_hpos < width && !wide_column_end_hpos) |
a997a7ca KH |
1399 | { |
1400 | /* Line breaking occurs in the middle of multi-column | |
1401 | character. Go back to previous line. */ | |
1402 | hpos = contin_hpos; | |
1403 | vpos = vpos - 1; | |
1404 | } | |
a997a7ca KH |
1405 | break; |
1406 | } | |
1407 | ||
8a00d895 | 1408 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
33fe7d20 RS |
1409 | { |
1410 | if (contin_hpos && prev_hpos == 0 | |
9129bcc3 KH |
1411 | && hpos > tohpos |
1412 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
33fe7d20 RS |
1413 | { /* Line breaks because we can't put the character at the |
1414 | previous line any more. It is not the multi-column | |
1415 | character continued in middle. Go back to previous | |
1416 | buffer position, screen position, and set tab offset | |
1417 | to previous value. It's the beginning of the | |
1418 | line. */ | |
1419 | pos = prev_pos; | |
1420 | pos_byte = prev_pos_byte; | |
1421 | hpos = prev_hpos; | |
6b61353c | 1422 | vpos = prev_vpos; |
33fe7d20 RS |
1423 | tab_offset = prev_tab_offset; |
1424 | } | |
1425 | break; | |
1426 | } | |
a997a7ca | 1427 | if (pos == ZV) /* We cannot go beyond ZV. Stop here. */ |
2ab90d49 KH |
1428 | break; |
1429 | ||
2ab90d49 | 1430 | prev_hpos = hpos; |
6b61353c | 1431 | prev_vpos = vpos; |
a997a7ca | 1432 | prev_pos = pos; |
fe0066f5 | 1433 | prev_pos_byte = pos_byte; |
c9c0f7cf | 1434 | wide_column_end_hpos = 0; |
0aa01123 JB |
1435 | |
1436 | /* Consult the width run cache to see if we can avoid inspecting | |
1437 | the text character-by-character. */ | |
1438 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
1439 | { | |
c098fdb8 | 1440 | EMACS_INT run_end; |
0aa01123 JB |
1441 | int common_width |
1442 | = region_cache_forward (current_buffer, | |
1443 | current_buffer->width_run_cache, | |
1444 | pos, &run_end); | |
1445 | ||
1446 | /* A width of zero means the character's width varies (like | |
1447 | a tab), is meaningless (like a newline), or we just don't | |
1448 | want to skip over it for some other reason. */ | |
1449 | if (common_width != 0) | |
1450 | { | |
5816888b | 1451 | EMACS_INT run_end_hpos; |
0aa01123 JB |
1452 | |
1453 | /* Don't go past the final buffer posn the user | |
1454 | requested. */ | |
1455 | if (run_end > to) | |
1456 | run_end = to; | |
1457 | ||
1458 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1459 | ||
1460 | /* Don't go past the final horizontal position the user | |
1461 | requested. */ | |
1462 | if (vpos == tovpos && run_end_hpos > tohpos) | |
1463 | { | |
1464 | run_end = pos + (tohpos - hpos) / common_width; | |
1465 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1466 | } | |
2ff4775b | 1467 | |
0aa01123 JB |
1468 | /* Don't go past the margin. */ |
1469 | if (run_end_hpos >= width) | |
1470 | { | |
1471 | run_end = pos + (width - hpos) / common_width; | |
1472 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1473 | } | |
1474 | ||
1475 | hpos = run_end_hpos; | |
1476 | if (run_end > pos) | |
1477 | prev_hpos = hpos - common_width; | |
fe0066f5 RS |
1478 | if (pos != run_end) |
1479 | { | |
1480 | pos = run_end; | |
1481 | pos_byte = CHAR_TO_BYTE (pos); | |
1482 | } | |
0aa01123 JB |
1483 | } |
1484 | ||
1485 | next_width_run = run_end + 1; | |
1486 | } | |
1487 | ||
1488 | /* We have to scan the text character-by-character. */ | |
993b6404 | 1489 | else |
2ab90d49 | 1490 | { |
88c6e37e GM |
1491 | EMACS_INT i, n; |
1492 | Lisp_Object charvec; | |
097812fb | 1493 | |
012fd715 | 1494 | /* Check composition sequence. */ |
d6721dda KH |
1495 | if (cmp_it.id >= 0 |
1496 | || (pos == cmp_it.stop_pos | |
1497 | && composition_reseat_it (&cmp_it, pos, pos_byte, to, win, | |
1498 | NULL, Qnil))) | |
1499 | composition_update_it (&cmp_it, pos, pos_byte, Qnil); | |
1500 | if (cmp_it.id >= 0) | |
1501 | { | |
1502 | pos += cmp_it.nchars; | |
1503 | pos_byte += cmp_it.nbytes; | |
1504 | hpos += cmp_it.width; | |
1505 | if (cmp_it.to == cmp_it.nglyphs) | |
1506 | { | |
1507 | cmp_it.id = -1; | |
1508 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, | |
1509 | Qnil); | |
1510 | } | |
1511 | else | |
1512 | cmp_it.from = cmp_it.to; | |
1513 | continue; | |
1514 | } | |
012fd715 | 1515 | |
d6721dda | 1516 | c = FETCH_BYTE (pos_byte); |
fe0066f5 | 1517 | pos++, pos_byte++; |
0aa01123 | 1518 | |
2ab90d49 KH |
1519 | /* Perhaps add some info to the width_run_cache. */ |
1520 | if (current_buffer->width_run_cache) | |
1521 | { | |
1522 | /* Is this character part of the current run? If so, extend | |
1523 | the run. */ | |
1524 | if (pos - 1 == width_run_end | |
5db0afb7 | 1525 | && XFASTINT (width_table[c]) == width_run_width) |
2ab90d49 KH |
1526 | width_run_end = pos; |
1527 | ||
1528 | /* The previous run is over, since this is a character at a | |
1529 | different position, or a different width. */ | |
1530 | else | |
1531 | { | |
1532 | /* Have we accumulated a run to put in the cache? | |
1533 | (Currently, we only cache runs of width == 1). */ | |
1534 | if (width_run_start < width_run_end | |
1535 | && width_run_width == 1) | |
1536 | know_region_cache (current_buffer, | |
1537 | current_buffer->width_run_cache, | |
1538 | width_run_start, width_run_end); | |
1539 | ||
1540 | /* Start recording a new width run. */ | |
5db0afb7 | 1541 | width_run_width = XFASTINT (width_table[c]); |
2ab90d49 KH |
1542 | width_run_start = pos - 1; |
1543 | width_run_end = pos; | |
1544 | } | |
1545 | } | |
993b6404 | 1546 | |
c9c0f7cf | 1547 | if (dp != 0 |
409f2919 | 1548 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 1549 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
993b6404 | 1550 | { |
88c6e37e GM |
1551 | charvec = DISP_CHAR_VECTOR (dp, c); |
1552 | n = ASIZE (charvec); | |
993b6404 | 1553 | } |
88c6e37e | 1554 | else |
993b6404 | 1555 | { |
88c6e37e GM |
1556 | charvec = Qnil; |
1557 | n = 1; | |
1558 | } | |
1559 | ||
1560 | for (i = n - 1; i >= 0; --i) | |
1561 | { | |
1562 | if (VECTORP (charvec)) | |
2ab90d49 | 1563 | { |
88c6e37e GM |
1564 | /* This should be handled the same as |
1565 | next_element_from_display_vector does it. */ | |
1566 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 1567 | |
f59836fe KS |
1568 | if (GLYPH_CODE_P (entry) |
1569 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
1570 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
1571 | else |
1572 | c = ' '; | |
1573 | } | |
097812fb | 1574 | |
88c6e37e GM |
1575 | if (c >= 040 && c < 0177) |
1576 | hpos++; | |
1577 | else if (c == '\t') | |
1578 | { | |
1579 | int tem = ((hpos + tab_offset + hscroll - (hscroll > 0)) | |
1580 | % tab_width); | |
1581 | if (tem < 0) | |
1582 | tem += tab_width; | |
1583 | hpos += tab_width - tem; | |
1584 | } | |
1585 | else if (c == '\n') | |
1586 | { | |
1587 | if (selective > 0 | |
7831777b | 1588 | && indented_beyond_p (pos, pos_byte, selective)) |
2ab90d49 | 1589 | { |
88c6e37e GM |
1590 | /* If (pos == to), we don't have to take care of |
1591 | selective display. */ | |
1592 | if (pos < to) | |
fe0066f5 | 1593 | { |
88c6e37e GM |
1594 | /* Skip any number of invisible lines all at once */ |
1595 | do | |
1596 | { | |
1597 | pos = find_before_next_newline (pos, to, 1); | |
1598 | if (pos < to) | |
1599 | pos++; | |
1600 | pos_byte = CHAR_TO_BYTE (pos); | |
1601 | } | |
1602 | while (pos < to | |
097812fb | 1603 | && indented_beyond_p (pos, pos_byte, |
7831777b | 1604 | selective)); |
88c6e37e GM |
1605 | /* Allow for the " ..." that is displayed for them. */ |
1606 | if (selective_rlen) | |
1607 | { | |
1608 | hpos += selective_rlen; | |
1609 | if (hpos >= width) | |
1610 | hpos = width; | |
1611 | } | |
1612 | DEC_BOTH (pos, pos_byte); | |
1613 | /* We have skipped the invis text, but not the | |
1614 | newline after. */ | |
fe0066f5 | 1615 | } |
2ab90d49 | 1616 | } |
88c6e37e GM |
1617 | else |
1618 | { | |
1619 | /* A visible line. */ | |
1620 | vpos++; | |
1621 | hpos = 0; | |
1622 | hpos -= hscroll; | |
1623 | /* Count the truncation glyph on column 0 */ | |
1624 | if (hscroll > 0) | |
ed5c373c | 1625 | hpos += continuation_glyph_width; |
88c6e37e GM |
1626 | tab_offset = 0; |
1627 | } | |
1628 | contin_hpos = 0; | |
2ab90d49 | 1629 | } |
88c6e37e | 1630 | else if (c == CR && selective < 0) |
fe0066f5 | 1631 | { |
88c6e37e GM |
1632 | /* In selective display mode, |
1633 | everything from a ^M to the end of the line is invisible. | |
1634 | Stop *before* the real newline. */ | |
1635 | if (pos < to) | |
1636 | { | |
1637 | pos = find_before_next_newline (pos, to, 1); | |
1638 | pos_byte = CHAR_TO_BYTE (pos); | |
1639 | } | |
1640 | /* If we just skipped next_boundary, | |
1641 | loop around in the main while | |
1642 | and handle it. */ | |
1643 | if (pos > next_boundary) | |
1644 | next_boundary = pos; | |
1645 | /* Allow for the " ..." that is displayed for them. */ | |
1646 | if (selective_rlen) | |
1647 | { | |
1648 | hpos += selective_rlen; | |
1649 | if (hpos >= width) | |
1650 | hpos = width; | |
1651 | } | |
fe0066f5 | 1652 | } |
409f2919 | 1653 | else if (multibyte && LEADING_CODE_P (c)) |
2ab90d49 | 1654 | { |
88c6e37e GM |
1655 | /* Start of multi-byte form. */ |
1656 | unsigned char *ptr; | |
c59478bc | 1657 | int mb_bytes, mb_width; |
88c6e37e GM |
1658 | |
1659 | pos_byte--; /* rewind POS_BYTE */ | |
1660 | ptr = BYTE_POS_ADDR (pos_byte); | |
85f24f61 PE |
1661 | MULTIBYTE_BYTES_WIDTH (ptr, dp, mb_bytes, mb_width); |
1662 | pos_byte += mb_bytes; | |
c59478bc PE |
1663 | if (mb_width > 1 && BYTES_BY_CHAR_HEAD (*ptr) == mb_bytes) |
1664 | wide_column_end_hpos = hpos + mb_width; | |
85f24f61 | 1665 | hpos += mb_width; |
2ab90d49 | 1666 | } |
f1004faf GM |
1667 | else if (VECTORP (charvec)) |
1668 | ++hpos; | |
88c6e37e GM |
1669 | else |
1670 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
2ab90d49 | 1671 | } |
993b6404 JB |
1672 | } |
1673 | } | |
1674 | ||
98136db3 RS |
1675 | after_loop: |
1676 | ||
0aa01123 JB |
1677 | /* Remember any final width run in the cache. */ |
1678 | if (current_buffer->width_run_cache | |
1679 | && width_run_width == 1 | |
1680 | && width_run_start < width_run_end) | |
1681 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
1682 | width_run_start, width_run_end); | |
1683 | ||
993b6404 | 1684 | val_compute_motion.bufpos = pos; |
fe0066f5 | 1685 | val_compute_motion.bytepos = pos_byte; |
cde9337b JB |
1686 | val_compute_motion.hpos = hpos; |
1687 | val_compute_motion.vpos = vpos; | |
ef3af330 AS |
1688 | if (contin_hpos && prev_hpos == 0) |
1689 | val_compute_motion.prevhpos = contin_hpos; | |
1690 | else | |
1691 | val_compute_motion.prevhpos = prev_hpos; | |
927b5a55 RS |
1692 | /* We alalways handle all of them here; none of them remain to do. */ |
1693 | val_compute_motion.ovstring_chars_done = 0; | |
993b6404 JB |
1694 | |
1695 | /* Nonzero if have just continued a line */ | |
a997a7ca | 1696 | val_compute_motion.contin = (contin_hpos && prev_hpos == 0); |
993b6404 | 1697 | |
e4500116 | 1698 | immediate_quit = 0; |
993b6404 JB |
1699 | return &val_compute_motion; |
1700 | } | |
993b6404 | 1701 | |
8720a429 | 1702 | |
88af3af4 | 1703 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
8c1a1077 PJ |
1704 | doc: /* Scan through the current buffer, calculating screen position. |
1705 | Scan the current buffer forward from offset FROM, | |
1706 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
1707 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
1708 | and return the ending buffer position and screen location. | |
1709 | ||
361f14bf KS |
1710 | If TOPOS is nil, the actual width and height of the window's |
1711 | text area are used. | |
1712 | ||
8c1a1077 PJ |
1713 | There are three additional arguments: |
1714 | ||
1715 | WIDTH is the number of columns available to display text; | |
361f14bf KS |
1716 | this affects handling of continuation lines. A value of nil |
1717 | corresponds to the actual number of available text columns. | |
8c1a1077 PJ |
1718 | |
1719 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
1720 | HSCROLL is the number of columns not being displayed at the left | |
1721 | margin; this is usually taken from a window's hscroll member. | |
1722 | TAB-OFFSET is the number of columns of the first tab that aren't | |
1723 | being displayed, perhaps because the line was continued within it. | |
1724 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
1725 | ||
1726 | WINDOW is the window to operate on. It is used to choose the display table; | |
1727 | if it is showing the current buffer, it is used also for | |
1728 | deciding which overlay properties apply. | |
1729 | Note that `compute-motion' always operates on the current buffer. | |
1730 | ||
1731 | The value is a list of five elements: | |
1732 | (POS HPOS VPOS PREVHPOS CONTIN) | |
1733 | POS is the buffer position where the scan stopped. | |
1734 | VPOS is the vertical position where the scan stopped. | |
1735 | HPOS is the horizontal position where the scan stopped. | |
1736 | ||
1737 | PREVHPOS is the horizontal position one character back from POS. | |
1738 | CONTIN is t if a line was continued after (or within) the previous character. | |
1739 | ||
1740 | For example, to find the buffer position of column COL of line LINE | |
1741 | of a certain window, pass the window's starting location as FROM | |
1742 | and the window's upper-left coordinates as FROMPOS. | |
1743 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
1744 | visible section of the buffer, and pass LINE and COL as TOPOS. */) | |
5842a27b | 1745 | (Lisp_Object from, Lisp_Object frompos, Lisp_Object to, Lisp_Object topos, Lisp_Object width, Lisp_Object offsets, Lisp_Object window) |
42918ba5 | 1746 | { |
361f14bf | 1747 | struct window *w; |
8798a92b | 1748 | Lisp_Object bufpos, hpos, vpos, prevhpos; |
42918ba5 RS |
1749 | struct position *pos; |
1750 | int hscroll, tab_offset; | |
1751 | ||
b7826503 PJ |
1752 | CHECK_NUMBER_COERCE_MARKER (from); |
1753 | CHECK_CONS (frompos); | |
1754 | CHECK_NUMBER_CAR (frompos); | |
1755 | CHECK_NUMBER_CDR (frompos); | |
1756 | CHECK_NUMBER_COERCE_MARKER (to); | |
361f14bf KS |
1757 | if (!NILP (topos)) |
1758 | { | |
1759 | CHECK_CONS (topos); | |
1760 | CHECK_NUMBER_CAR (topos); | |
1761 | CHECK_NUMBER_CDR (topos); | |
1762 | } | |
1763 | if (!NILP (width)) | |
1764 | CHECK_NUMBER (width); | |
1765 | ||
42918ba5 RS |
1766 | if (!NILP (offsets)) |
1767 | { | |
b7826503 PJ |
1768 | CHECK_CONS (offsets); |
1769 | CHECK_NUMBER_CAR (offsets); | |
1770 | CHECK_NUMBER_CDR (offsets); | |
70949dac KR |
1771 | hscroll = XINT (XCAR (offsets)); |
1772 | tab_offset = XINT (XCDR (offsets)); | |
42918ba5 RS |
1773 | } |
1774 | else | |
1775 | hscroll = tab_offset = 0; | |
1776 | ||
88af3af4 KH |
1777 | if (NILP (window)) |
1778 | window = Fselected_window (); | |
1779 | else | |
b7826503 | 1780 | CHECK_LIVE_WINDOW (window); |
361f14bf | 1781 | w = XWINDOW (window); |
88af3af4 | 1782 | |
9fdae274 KH |
1783 | if (XINT (from) < BEGV || XINT (from) > ZV) |
1784 | args_out_of_range_3 (from, make_number (BEGV), make_number (ZV)); | |
1785 | if (XINT (to) < BEGV || XINT (to) > ZV) | |
1786 | args_out_of_range_3 (to, make_number (BEGV), make_number (ZV)); | |
1787 | ||
70949dac KR |
1788 | pos = compute_motion (XINT (from), XINT (XCDR (frompos)), |
1789 | XINT (XCAR (frompos)), 0, | |
361f14bf KS |
1790 | XINT (to), |
1791 | (NILP (topos) | |
1792 | ? window_internal_height (w) | |
1793 | : XINT (XCDR (topos))), | |
1794 | (NILP (topos) | |
abde8f8c | 1795 | ? (window_body_cols (w) |
361f14bf KS |
1796 | - ( |
1797 | #ifdef HAVE_WINDOW_SYSTEM | |
1798 | FRAME_WINDOW_P (XFRAME (w->frame)) ? 0 : | |
1799 | #endif | |
1800 | 1)) | |
1801 | : XINT (XCAR (topos))), | |
1802 | (NILP (width) ? -1 : XINT (width)), | |
1803 | hscroll, tab_offset, | |
88af3af4 | 1804 | XWINDOW (window)); |
42918ba5 | 1805 | |
94d92e9c | 1806 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
1807 | XSETINT (hpos, pos->hpos); |
1808 | XSETINT (vpos, pos->vpos); | |
1809 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
1810 | |
1811 | return Fcons (bufpos, | |
1812 | Fcons (hpos, | |
1813 | Fcons (vpos, | |
1814 | Fcons (prevhpos, | |
1815 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
1816 | ||
1817 | } | |
993b6404 | 1818 | \f |
0aa01123 | 1819 | /* Fvertical_motion and vmotion */ |
88c6e37e | 1820 | |
9306c32e | 1821 | static struct position val_vmotion; |
993b6404 JB |
1822 | |
1823 | struct position * | |
971de7fb | 1824 | vmotion (register EMACS_INT from, register EMACS_INT vtarget, struct window *w) |
993b6404 | 1825 | { |
83155776 | 1826 | EMACS_INT hscroll = XINT (w->hscroll); |
993b6404 JB |
1827 | struct position pos; |
1828 | /* vpos is cumulative vertical position, changed as from is changed */ | |
1829 | register int vpos = 0; | |
83155776 SM |
1830 | EMACS_INT prevline; |
1831 | register EMACS_INT first; | |
1832 | EMACS_INT from_byte; | |
1833 | EMACS_INT lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
7831777b | 1834 | EMACS_INT selective |
4b4deea2 TT |
1835 | = (INTEGERP (BVAR (current_buffer, selective_display)) |
1836 | ? XINT (BVAR (current_buffer, selective_display)) | |
1837 | : !NILP (BVAR (current_buffer, selective_display)) ? -1 : 0); | |
99ce22d5 | 1838 | Lisp_Object window; |
83155776 | 1839 | EMACS_INT start_hpos = 0; |
2ab90d49 | 1840 | int did_motion; |
7ac57cb3 RS |
1841 | /* This is the object we use for fetching character properties. */ |
1842 | Lisp_Object text_prop_object; | |
99ce22d5 KH |
1843 | |
1844 | XSETWINDOW (window, w); | |
1845 | ||
7ac57cb3 RS |
1846 | /* If the window contains this buffer, use it for getting text properties. |
1847 | Otherwise use the current buffer as arg for doing that. */ | |
1848 | if (EQ (w->buffer, Fcurrent_buffer ())) | |
1849 | text_prop_object = window; | |
1850 | else | |
1851 | text_prop_object = Fcurrent_buffer (); | |
1852 | ||
99ce22d5 | 1853 | if (vpos >= vtarget) |
993b6404 | 1854 | { |
99ce22d5 | 1855 | /* To move upward, go a line at a time until |
fe0066f5 | 1856 | we have gone at least far enough. */ |
99ce22d5 KH |
1857 | |
1858 | first = 1; | |
1859 | ||
1860 | while ((vpos > vtarget || first) && from > BEGV) | |
993b6404 | 1861 | { |
66c75ca5 RS |
1862 | Lisp_Object propval; |
1863 | ||
2965dff9 RS |
1864 | prevline = find_next_newline_no_quit (from - 1, -1); |
1865 | while (prevline > BEGV | |
5a05d3d2 | 1866 | && ((selective > 0 |
2965dff9 RS |
1867 | && indented_beyond_p (prevline, |
1868 | CHAR_TO_BYTE (prevline), | |
7831777b | 1869 | selective)) |
2965dff9 RS |
1870 | /* Watch out for newlines with `invisible' property. |
1871 | When moving upward, check the newline before. */ | |
1872 | || (propval = Fget_char_property (make_number (prevline - 1), | |
66c75ca5 | 1873 | Qinvisible, |
7ac57cb3 | 1874 | text_prop_object), |
339ee979 | 1875 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1876 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1877 | pos = *compute_motion (prevline, 0, | |
1878 | lmargin + (prevline == BEG ? start_hpos : 0), | |
2ab90d49 | 1879 | 0, |
097812fb | 1880 | from, |
a997a7ca KH |
1881 | /* Don't care for VPOS... */ |
1882 | 1 << (BITS_PER_SHORT - 1), | |
1883 | /* ... nor HPOS. */ | |
1884 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1885 | -1, hscroll, |
2dd4e608 RS |
1886 | /* This compensates for start_hpos |
1887 | so that a tab as first character | |
1888 | still occupies 8 columns. */ | |
2965dff9 | 1889 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1890 | w); |
99ce22d5 KH |
1891 | vpos -= pos.vpos; |
1892 | first = 0; | |
2965dff9 | 1893 | from = prevline; |
993b6404 | 1894 | } |
99ce22d5 KH |
1895 | |
1896 | /* If we made exactly the desired vertical distance, | |
1897 | or if we hit beginning of buffer, | |
1898 | return point found */ | |
1899 | if (vpos >= vtarget) | |
993b6404 | 1900 | { |
99ce22d5 | 1901 | val_vmotion.bufpos = from; |
fe0066f5 | 1902 | val_vmotion.bytepos = CHAR_TO_BYTE (from); |
99ce22d5 KH |
1903 | val_vmotion.vpos = vpos; |
1904 | val_vmotion.hpos = lmargin; | |
1905 | val_vmotion.contin = 0; | |
1906 | val_vmotion.prevhpos = 0; | |
927b5a55 | 1907 | val_vmotion.ovstring_chars_done = 0; |
a997a7ca | 1908 | val_vmotion.tab_offset = 0; /* For accumulating tab offset. */ |
99ce22d5 | 1909 | return &val_vmotion; |
993b6404 | 1910 | } |
993b6404 | 1911 | |
99ce22d5 KH |
1912 | /* Otherwise find the correct spot by moving down */ |
1913 | } | |
1914 | /* Moving downward is simple, but must calculate from beg of line | |
1915 | to determine hpos of starting point */ | |
fe0066f5 RS |
1916 | from_byte = CHAR_TO_BYTE (from); |
1917 | if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n') | |
993b6404 | 1918 | { |
2ab90d49 | 1919 | Lisp_Object propval; |
66c75ca5 | 1920 | |
2965dff9 RS |
1921 | prevline = find_next_newline_no_quit (from, -1); |
1922 | while (prevline > BEGV | |
99ce22d5 | 1923 | && ((selective > 0 |
2965dff9 RS |
1924 | && indented_beyond_p (prevline, |
1925 | CHAR_TO_BYTE (prevline), | |
7831777b | 1926 | selective)) |
2965dff9 RS |
1927 | /* Watch out for newlines with `invisible' property. |
1928 | When moving downward, check the newline after. */ | |
1929 | || (propval = Fget_char_property (make_number (prevline), | |
1930 | Qinvisible, | |
7ac57cb3 | 1931 | text_prop_object), |
339ee979 | 1932 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1933 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1934 | pos = *compute_motion (prevline, 0, | |
1935 | lmargin + (prevline == BEG | |
92992c7e | 1936 | ? start_hpos : 0), |
2ab90d49 | 1937 | 0, |
097812fb | 1938 | from, |
a997a7ca KH |
1939 | /* Don't care for VPOS... */ |
1940 | 1 << (BITS_PER_SHORT - 1), | |
1941 | /* ... nor HPOS. */ | |
1942 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1943 | -1, hscroll, |
2965dff9 | 1944 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1945 | w); |
2ab90d49 | 1946 | did_motion = 1; |
993b6404 | 1947 | } |
99ce22d5 | 1948 | else |
993b6404 | 1949 | { |
99ce22d5 KH |
1950 | pos.hpos = lmargin + (from == BEG ? start_hpos : 0); |
1951 | pos.vpos = 0; | |
a997a7ca | 1952 | pos.tab_offset = 0; |
2ab90d49 | 1953 | did_motion = 0; |
993b6404 | 1954 | } |
2ab90d49 | 1955 | return compute_motion (from, vpos, pos.hpos, did_motion, |
a997a7ca | 1956 | ZV, vtarget, - (1 << (BITS_PER_SHORT - 1)), |
361f14bf | 1957 | -1, hscroll, |
a997a7ca | 1958 | pos.tab_offset - (from == BEG ? start_hpos : 0), |
2dd4e608 | 1959 | w); |
993b6404 JB |
1960 | } |
1961 | ||
a7ca3326 | 1962 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
8c1a1077 PJ |
1963 | doc: /* Move point to start of the screen line LINES lines down. |
1964 | If LINES is negative, this means moving up. | |
1965 | ||
1966 | This function is an ordinary cursor motion function | |
1967 | which calculates the new position based on how text would be displayed. | |
1968 | The new position may be the start of a line, | |
1969 | or just the start of a continuation line. | |
1970 | The function returns number of screen lines moved over; | |
1971 | that usually equals LINES, but may be closer to zero | |
1972 | if beginning or end of buffer was reached. | |
1973 | ||
1974 | The optional second argument WINDOW specifies the window to use for | |
1975 | parameters such as width, horizontal scrolling, and so on. | |
1976 | The default is to use the selected window's parameters. | |
1977 | ||
c876b227 SM |
1978 | LINES can optionally take the form (COLS . LINES), in which case |
1979 | the motion will not stop at the start of a screen line but on | |
1980 | its column COLS (if such exists on that line, that is). | |
1981 | ||
8c1a1077 PJ |
1982 | `vertical-motion' always uses the current buffer, |
1983 | regardless of which buffer is displayed in WINDOW. | |
1984 | This is consistent with other cursor motion functions | |
1985 | and makes it possible to use `vertical-motion' in any buffer, | |
1986 | whether or not it is currently displayed in some window. */) | |
5842a27b | 1987 | (Lisp_Object lines, Lisp_Object window) |
993b6404 | 1988 | { |
8720a429 GM |
1989 | struct it it; |
1990 | struct text_pos pt; | |
8720a429 | 1991 | struct window *w; |
39210e90 GM |
1992 | Lisp_Object old_buffer; |
1993 | struct gcpro gcpro1; | |
baed8445 | 1994 | Lisp_Object lcols = Qnil; |
5671df8f | 1995 | double cols IF_LINT (= 0); |
c876b227 SM |
1996 | |
1997 | /* Allow LINES to be of the form (HPOS . VPOS) aka (COLUMNS . LINES). */ | |
1998 | if (CONSP (lines) && (NUMBERP (XCAR (lines)))) | |
1999 | { | |
baed8445 SM |
2000 | lcols = XCAR (lines); |
2001 | cols = INTEGERP (lcols) ? (double) XINT (lcols) : XFLOAT_DATA (lcols); | |
c876b227 SM |
2002 | lines = XCDR (lines); |
2003 | } | |
993b6404 | 2004 | |
b7826503 | 2005 | CHECK_NUMBER (lines); |
f1ecfe9b | 2006 | if (! NILP (window)) |
b7826503 | 2007 | CHECK_WINDOW (window); |
f1ecfe9b | 2008 | else |
92992c7e | 2009 | window = selected_window; |
8720a429 | 2010 | w = XWINDOW (window); |
39210e90 GM |
2011 | |
2012 | old_buffer = Qnil; | |
2013 | GCPRO1 (old_buffer); | |
2014 | if (XBUFFER (w->buffer) != current_buffer) | |
8720a429 | 2015 | { |
39210e90 GM |
2016 | /* Set the window's buffer temporarily to the current buffer. */ |
2017 | old_buffer = w->buffer; | |
2018 | XSETBUFFER (w->buffer, current_buffer); | |
8720a429 | 2019 | } |
097812fb | 2020 | |
6df71429 | 2021 | if (noninteractive) |
9305b0e7 | 2022 | { |
6df71429 RS |
2023 | struct position pos; |
2024 | pos = *vmotion (PT, XINT (lines), w); | |
2025 | SET_PT_BOTH (pos.bufpos, pos.bytepos); | |
9305b0e7 KS |
2026 | } |
2027 | else | |
6df71429 | 2028 | { |
d1dfb56c EZ |
2029 | EMACS_INT it_start; |
2030 | int first_x, it_overshoot_expected IF_LINT (= 0); | |
24a06d04 | 2031 | |
6df71429 RS |
2032 | SET_TEXT_POS (pt, PT, PT_BYTE); |
2033 | start_display (&it, w, pt); | |
2f4ec7ce | 2034 | first_x = it.first_visible_x; |
24a06d04 | 2035 | it_start = IT_CHARPOS (it); |
14a7cabf | 2036 | |
48cdfb4b CY |
2037 | /* See comments below for why we calculate this. */ |
2038 | if (XINT (lines) > 0) | |
14a7cabf | 2039 | { |
d6721dda KH |
2040 | if (it.cmp_it.id >= 0) |
2041 | it_overshoot_expected = 1; | |
187bc86f | 2042 | else if (it.method == GET_FROM_STRING) |
48cdfb4b | 2043 | { |
42a5b22f | 2044 | const char *s = SSDATA (it.string); |
48cdfb4b CY |
2045 | const char *e = s + SBYTES (it.string); |
2046 | while (s < e && *s != '\n') | |
2047 | ++s; | |
2048 | it_overshoot_expected = (s == e) ? -1 : 0; | |
2049 | } | |
2050 | else | |
2051 | it_overshoot_expected = (it.method == GET_FROM_IMAGE | |
d6721dda | 2052 | || it.method == GET_FROM_STRETCH); |
14a7cabf | 2053 | } |
14a7cabf | 2054 | |
48cdfb4b CY |
2055 | /* Scan from the start of the line containing PT. If we don't |
2056 | do this, we start moving with IT->current_x == 0, while PT is | |
2057 | really at some x > 0. */ | |
b54a7539 KS |
2058 | reseat_at_previous_visible_line_start (&it); |
2059 | it.current_x = it.hpos = 0; | |
af2be002 | 2060 | if (IT_CHARPOS (it) != PT) |
11fb10de CY |
2061 | /* We used to temporarily disable selective display here; the |
2062 | comment said this is "so we don't move too far" (2005-01-19 | |
2063 | checkin by kfs). But this does nothing useful that I can | |
2064 | tell, and it causes Bug#2694 . -- cyd */ | |
2065 | move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS); | |
b54a7539 | 2066 | |
48cdfb4b | 2067 | if (XINT (lines) <= 0) |
72ad106b | 2068 | { |
48cdfb4b CY |
2069 | it.vpos = 0; |
2070 | /* Do this even if LINES is 0, so that we move back to the | |
2071 | beginning of the current line as we ought. */ | |
2072 | if (XINT (lines) == 0 || IT_CHARPOS (it) > 0) | |
e4cc2dfc | 2073 | move_it_by_lines (&it, XINT (lines)); |
48cdfb4b CY |
2074 | } |
2075 | else | |
2076 | { | |
2421af7e | 2077 | if (IT_CHARPOS (it) > it_start) |
48cdfb4b CY |
2078 | { |
2079 | /* IT may move too far if truncate-lines is on and PT | |
2080 | lies beyond the right margin. In that case, | |
2081 | backtrack unless the starting point is on an image, | |
2082 | stretch glyph, composition, or Lisp string. */ | |
2083 | if (!it_overshoot_expected | |
2084 | /* Also, backtrack if the Lisp string contains no | |
2085 | newline, but there is a newline right after it. | |
2086 | In this case, IT overshoots if there is an | |
2087 | after-string just before the newline. */ | |
2088 | || (it_overshoot_expected < 0 | |
2089 | && it.method == GET_FROM_BUFFER | |
2090 | && it.c == '\n')) | |
e4cc2dfc | 2091 | move_it_by_lines (&it, -1); |
48cdfb4b | 2092 | it.vpos = 0; |
e4cc2dfc | 2093 | move_it_by_lines (&it, XINT (lines)); |
48cdfb4b CY |
2094 | } |
2095 | else | |
2096 | { | |
2097 | /* Otherwise, we are at the first row occupied by PT, | |
2098 | which might span multiple screen lines (e.g., if it's | |
2099 | on a multi-line display string). We want to start | |
2100 | from the last line that it occupies. */ | |
051facec | 2101 | if (it_start < ZV) |
48cdfb4b | 2102 | { |
2421af7e | 2103 | while (IT_CHARPOS (it) <= it_start) |
d8a7e7fc CY |
2104 | { |
2105 | it.vpos = 0; | |
e4cc2dfc | 2106 | move_it_by_lines (&it, 1); |
d8a7e7fc CY |
2107 | } |
2108 | if (XINT (lines) > 1) | |
e4cc2dfc | 2109 | move_it_by_lines (&it, XINT (lines) - 1); |
48cdfb4b CY |
2110 | } |
2111 | else | |
d8a7e7fc CY |
2112 | { |
2113 | it.vpos = 0; | |
e4cc2dfc | 2114 | move_it_by_lines (&it, XINT (lines)); |
d8a7e7fc | 2115 | } |
48cdfb4b | 2116 | } |
72ad106b | 2117 | } |
097812fb | 2118 | |
2f4ec7ce | 2119 | /* Move to the goal column, if one was specified. */ |
baed8445 | 2120 | if (!NILP (lcols)) |
2f4ec7ce CY |
2121 | { |
2122 | /* If the window was originally hscrolled, move forward by | |
2123 | the hscrolled amount first. */ | |
2124 | if (first_x > 0) | |
2125 | { | |
2126 | move_it_in_display_line (&it, ZV, first_x, MOVE_TO_X); | |
2127 | it.current_x = 0; | |
2128 | } | |
2129 | move_it_in_display_line | |
2130 | (&it, ZV, | |
2131 | (int)(cols * FRAME_COLUMN_WIDTH (XFRAME (w->frame)) + 0.5), | |
2132 | MOVE_TO_X); | |
2133 | } | |
c876b227 | 2134 | |
6df71429 RS |
2135 | SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it)); |
2136 | } | |
8720a429 | 2137 | |
39210e90 GM |
2138 | if (BUFFERP (old_buffer)) |
2139 | w->buffer = old_buffer; | |
097812fb | 2140 | |
39210e90 | 2141 | RETURN_UNGCPRO (make_number (it.vpos)); |
993b6404 | 2142 | } |
8720a429 GM |
2143 | |
2144 | ||
993b6404 | 2145 | \f |
88c6e37e | 2146 | /* File's initialization. */ |
0aa01123 | 2147 | |
dfcf069d | 2148 | void |
971de7fb | 2149 | syms_of_indent (void) |
993b6404 | 2150 | { |
29208e82 | 2151 | DEFVAR_BOOL ("indent-tabs-mode", indent_tabs_mode, |
c86f7377 | 2152 | doc: /* *Indentation can insert tabs if this is non-nil. */); |
993b6404 JB |
2153 | indent_tabs_mode = 1; |
2154 | ||
2155 | defsubr (&Scurrent_indentation); | |
2156 | defsubr (&Sindent_to); | |
2157 | defsubr (&Scurrent_column); | |
2158 | defsubr (&Smove_to_column); | |
2159 | defsubr (&Svertical_motion); | |
42918ba5 | 2160 | defsubr (&Scompute_motion); |
993b6404 | 2161 | } |