Commit | Line | Data |
---|---|---|
993b6404 | 1 | /* Indentation functions. |
acaf905b | 2 | Copyright (C) 1985-1988, 1993-1995, 1998, 2000-2012 |
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 | 24 | #include "lisp.h" |
f6ed712f | 25 | #include "character.h" |
e5560ff7 | 26 | #include "buffer.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 | |
d311d28c | 48 | static ptrdiff_t last_known_column; |
88c6e37e GM |
49 | |
50 | /* Value of point when current_column was called. */ | |
51 | ||
d311d28c | 52 | ptrdiff_t last_known_column_point; |
88c6e37e GM |
53 | |
54 | /* Value of MODIFF when current_column was called. */ | |
55 | ||
d311d28c | 56 | static EMACS_INT last_known_column_modified; |
993b6404 | 57 | |
d311d28c PE |
58 | static ptrdiff_t current_column_1 (void); |
59 | static ptrdiff_t position_indentation (ptrdiff_t); | |
82d593eb | 60 | |
a997a7ca KH |
61 | /* Cache of beginning of line found by the last call of |
62 | current_column. */ | |
88c6e37e | 63 | |
d311d28c | 64 | static ptrdiff_t 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) |
1088b922 | 125 | emacs_abort (); |
0aa01123 JB |
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 | 143 | if (!VECTORP (BVAR (buf, width_table))) |
39eb03f1 | 144 | bset_width_table (buf, Fmake_vector (make_number (256), make_number (0))); |
4b4deea2 | 145 | widthtab = XVECTOR (BVAR (buf, width_table)); |
eab3844f | 146 | if (widthtab->header.size != 256) |
1088b922 | 147 | emacs_abort (); |
0aa01123 JB |
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; | |
39eb03f1 | 169 | bset_width_table (current_buffer, 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 | ||
d311d28c PE |
207 | ptrdiff_t |
208 | skip_invisible (ptrdiff_t pos, ptrdiff_t *next_boundary_p, ptrdiff_t to, Lisp_Object window) | |
9a21bb64 | 209 | { |
2e34157c | 210 | Lisp_Object prop, position, overlay_limit, proplimit; |
2ca8b6c2 | 211 | Lisp_Object buffer, tmp; |
d311d28c | 212 | ptrdiff_t end; |
83155776 | 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) | |
d3d50620 | 261 | && EQ (XWINDOW (window)->buffer, buffer)) |
662152dd SM |
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))) \ |
5637687f | 287 | width = sanitize_char_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 | ||
d311d28c | 321 | ptrdiff_t |
971de7fb | 322 | current_column (void) |
993b6404 | 323 | { |
d311d28c | 324 | register ptrdiff_t col; |
993b6404 JB |
325 | register unsigned char *ptr, *stop; |
326 | register int tab_seen; | |
d311d28c | 327 | ptrdiff_t post_tab; |
993b6404 | 328 | register int c; |
a2271ba2 | 329 | int tab_width = SANE_TAB_WIDTH (current_buffer); |
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. */ | |
0c94c8d6 | 339 | if (buffer_intervals (current_buffer) |
4cb3e6b3 | 340 | || buffer_has_overlays () |
813b81b3 RS |
341 | || Z != Z_BYTE) |
342 | return current_column_1 (); | |
9a21bb64 RS |
343 | |
344 | /* Scan backwards from point to the previous newline, | |
345 | counting width. Tab characters are the only complicated case. */ | |
346 | ||
993b6404 | 347 | /* Make a pointer for decrementing through the chars before point. */ |
fe0066f5 | 348 | ptr = BYTE_POS_ADDR (PT_BYTE - 1) + 1; |
993b6404 JB |
349 | /* Make a pointer to where consecutive chars leave off, |
350 | going backwards from point. */ | |
6ec8bbd2 | 351 | if (PT == BEGV) |
993b6404 | 352 | stop = ptr; |
6ec8bbd2 | 353 | else if (PT <= GPT || BEGV > GPT) |
993b6404 JB |
354 | stop = BEGV_ADDR; |
355 | else | |
356 | stop = GAP_END_ADDR; | |
357 | ||
993b6404 JB |
358 | col = 0, tab_seen = 0, post_tab = 0; |
359 | ||
360 | while (1) | |
361 | { | |
d311d28c | 362 | ptrdiff_t i, n; |
88c6e37e | 363 | Lisp_Object charvec; |
097812fb | 364 | |
993b6404 JB |
365 | if (ptr == stop) |
366 | { | |
367 | /* We stopped either for the beginning of the buffer | |
368 | or for the gap. */ | |
369 | if (ptr == BEGV_ADDR) | |
370 | break; | |
097812fb | 371 | |
993b6404 JB |
372 | /* It was the gap. Jump back over it. */ |
373 | stop = BEGV_ADDR; | |
374 | ptr = GPT_ADDR; | |
097812fb | 375 | |
993b6404 | 376 | /* Check whether that brings us to beginning of buffer. */ |
88c6e37e GM |
377 | if (BEGV >= GPT) |
378 | break; | |
993b6404 JB |
379 | } |
380 | ||
381 | c = *--ptr; | |
097812fb | 382 | |
88c6e37e | 383 | if (dp && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
7050d530 | 384 | { |
88c6e37e GM |
385 | charvec = DISP_CHAR_VECTOR (dp, c); |
386 | n = ASIZE (charvec); | |
7050d530 | 387 | } |
88c6e37e | 388 | else |
993b6404 | 389 | { |
88c6e37e GM |
390 | charvec = Qnil; |
391 | n = 1; | |
392 | } | |
097812fb | 393 | |
88c6e37e GM |
394 | for (i = n - 1; i >= 0; --i) |
395 | { | |
396 | if (VECTORP (charvec)) | |
397 | { | |
398 | /* This should be handled the same as | |
399 | next_element_from_display_vector does it. */ | |
400 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 401 | |
d311d28c | 402 | if (GLYPH_CODE_P (entry)) |
f59836fe | 403 | c = GLYPH_CODE_CHAR (entry); |
88c6e37e GM |
404 | else |
405 | c = ' '; | |
406 | } | |
097812fb | 407 | |
88c6e37e GM |
408 | if (c >= 040 && c < 0177) |
409 | col++; | |
410 | else if (c == '\n' | |
411 | || (c == '\r' | |
4b4deea2 | 412 | && EQ (BVAR (current_buffer, selective_display), Qt))) |
88c6e37e GM |
413 | { |
414 | ptr++; | |
415 | goto start_of_line_found; | |
416 | } | |
417 | else if (c == '\t') | |
418 | { | |
419 | if (tab_seen) | |
420 | col = ((col + tab_width) / tab_width) * tab_width; | |
097812fb | 421 | |
88c6e37e GM |
422 | post_tab += col; |
423 | col = 0; | |
424 | tab_seen = 1; | |
425 | } | |
f1004faf GM |
426 | else if (VECTORP (charvec)) |
427 | /* With a display table entry, C is displayed as is, and | |
428 | not displayed as \NNN or as ^N. If C is a single-byte | |
429 | character, it takes one column. If C is multi-byte in | |
430 | an unibyte buffer, it's translated to unibyte, so it | |
431 | also takes one column. */ | |
432 | ++col; | |
88c6e37e GM |
433 | else |
434 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
993b6404 | 435 | } |
993b6404 JB |
436 | } |
437 | ||
88c6e37e GM |
438 | start_of_line_found: |
439 | ||
993b6404 JB |
440 | if (tab_seen) |
441 | { | |
442 | col = ((col + tab_width) / tab_width) * tab_width; | |
443 | col += post_tab; | |
444 | } | |
445 | ||
a997a7ca KH |
446 | if (ptr == BEGV_ADDR) |
447 | current_column_bol_cache = BEGV; | |
448 | else | |
fe0066f5 RS |
449 | current_column_bol_cache = BYTE_TO_CHAR (PTR_BYTE_POS (ptr)); |
450 | ||
993b6404 | 451 | last_known_column = col; |
6ec8bbd2 | 452 | last_known_column_point = PT; |
993b6404 JB |
453 | last_known_column_modified = MODIFF; |
454 | ||
455 | return col; | |
456 | } | |
457 | \f | |
80e3db56 SM |
458 | |
459 | /* Check the presence of a display property and compute its width. | |
460 | If a property was found and its width was found as well, return | |
461 | its width (>= 0) and set the position of the end of the property | |
462 | in ENDPOS. | |
463 | Otherwise just return -1. */ | |
464 | static int | |
d311d28c | 465 | check_display_width (ptrdiff_t pos, ptrdiff_t col, ptrdiff_t *endpos) |
80e3db56 SM |
466 | { |
467 | Lisp_Object val, overlay; | |
468 | ||
469 | if (CONSP (val = get_char_property_and_overlay | |
470 | (make_number (pos), Qdisplay, Qnil, &overlay)) | |
471 | && EQ (Qspace, XCAR (val))) | |
1c14176c | 472 | { /* FIXME: Use calc_pixel_width_or_height. */ |
80e3db56 SM |
473 | Lisp_Object plist = XCDR (val), prop; |
474 | int width = -1; | |
d311d28c PE |
475 | EMACS_INT align_to_max = |
476 | (col < MOST_POSITIVE_FIXNUM - INT_MAX | |
477 | ? (EMACS_INT) INT_MAX + col | |
478 | : MOST_POSITIVE_FIXNUM); | |
80e3db56 | 479 | |
d311d28c PE |
480 | if ((prop = Fplist_get (plist, QCwidth), |
481 | RANGED_INTEGERP (0, prop, INT_MAX))) | |
80e3db56 | 482 | width = XINT (prop); |
d311d28c PE |
483 | else if (FLOATP (prop) && 0 <= XFLOAT_DATA (prop) |
484 | && XFLOAT_DATA (prop) <= INT_MAX) | |
80e3db56 | 485 | width = (int)(XFLOAT_DATA (prop) + 0.5); |
d311d28c PE |
486 | else if ((prop = Fplist_get (plist, QCalign_to), |
487 | RANGED_INTEGERP (col, prop, align_to_max))) | |
80e3db56 | 488 | width = XINT (prop) - col; |
d311d28c PE |
489 | else if (FLOATP (prop) && col <= XFLOAT_DATA (prop) |
490 | && (XFLOAT_DATA (prop) <= align_to_max)) | |
80e3db56 | 491 | width = (int)(XFLOAT_DATA (prop) + 0.5) - col; |
409f2919 | 492 | |
80e3db56 SM |
493 | if (width >= 0) |
494 | { | |
d311d28c | 495 | ptrdiff_t start; |
80e3db56 SM |
496 | if (OVERLAYP (overlay)) |
497 | *endpos = OVERLAY_POSITION (OVERLAY_END (overlay)); | |
498 | else | |
499 | get_property_and_range (pos, Qdisplay, &val, &start, endpos, Qnil); | |
500 | return width; | |
501 | } | |
502 | } | |
503 | return -1; | |
504 | } | |
505 | ||
ef6f5c0e SM |
506 | /* Scanning from the beginning of the current line, stop at the buffer |
507 | position ENDPOS or at the column GOALCOL or at the end of line, whichever | |
508 | comes first. | |
509 | Return the resulting buffer position and column in ENDPOS and GOALCOL. | |
510 | PREVCOL gets set to the column of the previous position (it's always | |
511 | strictly smaller than the goal column). */ | |
512 | static void | |
d311d28c | 513 | scan_for_column (ptrdiff_t *endpos, EMACS_INT *goalcol, ptrdiff_t *prevcol) |
9a21bb64 | 514 | { |
a2271ba2 | 515 | int tab_width = SANE_TAB_WIDTH (current_buffer); |
4b4deea2 | 516 | register int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow)); |
9a21bb64 | 517 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
4b4deea2 | 518 | int multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters)); |
d6721dda | 519 | struct composition_it cmp_it; |
fc88345b KH |
520 | Lisp_Object window; |
521 | struct window *w; | |
9a21bb64 RS |
522 | |
523 | /* Start the scan at the beginning of this line with column number 0. */ | |
d311d28c | 524 | register ptrdiff_t col = 0, prev_col = 0; |
ef6f5c0e | 525 | EMACS_INT goal = goalcol ? *goalcol : MOST_POSITIVE_FIXNUM; |
d311d28c PE |
526 | ptrdiff_t end = endpos ? *endpos : PT; |
527 | ptrdiff_t scan, scan_byte; | |
528 | ptrdiff_t next_boundary; | |
ef6f5c0e | 529 | { |
d311d28c | 530 | ptrdiff_t opoint = PT, opoint_byte = PT_BYTE; |
813b81b3 | 531 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); |
fe0066f5 RS |
532 | current_column_bol_cache = PT; |
533 | scan = PT, scan_byte = PT_BYTE; | |
534 | SET_PT_BOTH (opoint, opoint_byte); | |
535 | next_boundary = scan; | |
ef6f5c0e | 536 | } |
9a21bb64 | 537 | |
fc88345b KH |
538 | window = Fget_buffer_window (Fcurrent_buffer (), Qnil); |
539 | w = ! NILP (window) ? XWINDOW (window) : NULL; | |
540 | ||
72af86bd | 541 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
542 | cmp_it.id = -1; |
543 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, Qnil); | |
9a21bb64 RS |
544 | |
545 | /* Scan forward to the target position. */ | |
ef6f5c0e | 546 | while (scan < end) |
9a21bb64 RS |
547 | { |
548 | int c; | |
549 | ||
550 | /* Occasionally we may need to skip invisible text. */ | |
551 | while (scan == next_boundary) | |
552 | { | |
d311d28c | 553 | ptrdiff_t old_scan = scan; |
9a21bb64 RS |
554 | /* This updates NEXT_BOUNDARY to the next place |
555 | where we might need to skip more invisible text. */ | |
ef6f5c0e | 556 | scan = skip_invisible (scan, &next_boundary, end, Qnil); |
fe0066f5 RS |
557 | if (scan != old_scan) |
558 | scan_byte = CHAR_TO_BYTE (scan); | |
ef6f5c0e SM |
559 | if (scan >= end) |
560 | goto endloop; | |
9a21bb64 RS |
561 | } |
562 | ||
ef6f5c0e SM |
563 | /* Test reaching the goal column. We do this after skipping |
564 | invisible characters, so that we put point before the | |
565 | character on which the cursor will appear. */ | |
566 | if (col >= goal) | |
567 | break; | |
568 | prev_col = col; | |
569 | ||
80e3db56 | 570 | { /* Check display property. */ |
d311d28c | 571 | ptrdiff_t endp; |
85f24f61 | 572 | int width = check_display_width (scan, col, &endp); |
80e3db56 SM |
573 | if (width >= 0) |
574 | { | |
575 | col += width; | |
85f24f61 | 576 | if (endp > scan) /* Avoid infinite loops with 0-width overlays. */ |
80e3db56 | 577 | { |
85f24f61 | 578 | scan = endp; scan_byte = charpos_to_bytepos (scan); |
80e3db56 SM |
579 | continue; |
580 | } | |
581 | } | |
582 | } | |
583 | ||
d6721dda KH |
584 | /* Check composition sequence. */ |
585 | if (cmp_it.id >= 0 | |
586 | || (scan == cmp_it.stop_pos | |
587 | && composition_reseat_it (&cmp_it, scan, scan_byte, end, | |
fc88345b | 588 | w, NULL, Qnil))) |
d6721dda KH |
589 | composition_update_it (&cmp_it, scan, scan_byte, Qnil); |
590 | if (cmp_it.id >= 0) | |
591 | { | |
592 | scan += cmp_it.nchars; | |
593 | scan_byte += cmp_it.nbytes; | |
594 | if (scan <= end) | |
595 | col += cmp_it.width; | |
596 | if (cmp_it.to == cmp_it.nglyphs) | |
597 | { | |
598 | cmp_it.id = -1; | |
599 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, | |
600 | Qnil); | |
601 | } | |
602 | else | |
603 | cmp_it.from = cmp_it.to; | |
604 | continue; | |
605 | } | |
606 | ||
813b81b3 | 607 | c = FETCH_BYTE (scan_byte); |
88c6e37e | 608 | |
ef6f5c0e SM |
609 | /* See if there is a display table and it relates |
610 | to this character. */ | |
611 | ||
c9c0f7cf | 612 | if (dp != 0 |
409f2919 | 613 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 614 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
9a21bb64 | 615 | { |
d6e483a4 | 616 | Lisp_Object charvec; |
d311d28c | 617 | ptrdiff_t i, n; |
d6e483a4 RS |
618 | |
619 | /* This character is displayed using a vector of glyphs. | |
ef6f5c0e | 620 | Update the column/position based on those glyphs. */ |
d6e483a4 | 621 | |
88c6e37e GM |
622 | charvec = DISP_CHAR_VECTOR (dp, c); |
623 | n = ASIZE (charvec); | |
88c6e37e | 624 | |
d6e483a4 | 625 | for (i = 0; i < n; i++) |
88c6e37e GM |
626 | { |
627 | /* This should be handled the same as | |
628 | next_element_from_display_vector does it. */ | |
f59836fe | 629 | Lisp_Object entry = AREF (charvec, i); |
d6e483a4 | 630 | |
d311d28c | 631 | if (GLYPH_CODE_P (entry)) |
f59836fe | 632 | c = GLYPH_CODE_CHAR (entry); |
88c6e37e GM |
633 | else |
634 | c = ' '; | |
d6e483a4 RS |
635 | |
636 | if (c == '\n') | |
637 | goto endloop; | |
4b4deea2 | 638 | if (c == '\r' && EQ (BVAR (current_buffer, selective_display), Qt)) |
d6e483a4 RS |
639 | goto endloop; |
640 | if (c == '\t') | |
641 | { | |
d6e483a4 RS |
642 | col += tab_width; |
643 | col = col / tab_width * tab_width; | |
644 | } | |
645 | else | |
646 | ++col; | |
88c6e37e | 647 | } |
d6e483a4 RS |
648 | } |
649 | else | |
650 | { | |
ef6f5c0e SM |
651 | /* The display table doesn't affect this character; |
652 | it displays as itself. */ | |
d6e483a4 | 653 | |
88c6e37e GM |
654 | if (c == '\n') |
655 | goto endloop; | |
4b4deea2 | 656 | if (c == '\r' && EQ (BVAR (current_buffer, selective_display), Qt)) |
88c6e37e | 657 | goto endloop; |
88c6e37e GM |
658 | if (c == '\t') |
659 | { | |
88c6e37e GM |
660 | col += tab_width; |
661 | col = col / tab_width * tab_width; | |
662 | } | |
409f2919 | 663 | else if (multibyte && LEADING_CODE_P (c)) |
88c6e37e | 664 | { |
ef6f5c0e | 665 | /* Start of multi-byte form. */ |
88c6e37e | 666 | unsigned char *ptr; |
c59478bc | 667 | int bytes, width; |
097812fb | 668 | |
88c6e37e | 669 | ptr = BYTE_POS_ADDR (scan_byte); |
85f24f61 | 670 | MULTIBYTE_BYTES_WIDTH (ptr, dp, bytes, width); |
36974b5e RS |
671 | /* Subtract one to compensate for the increment |
672 | that is going to happen below. */ | |
ef6f5c0e | 673 | scan_byte += bytes - 1; |
88c6e37e GM |
674 | col += width; |
675 | } | |
676 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
677 | col += 2; | |
678 | else if (c < 040 || c >= 0177) | |
679 | col += 4; | |
680 | else | |
681 | col++; | |
a997a7ca | 682 | } |
d6e483a4 RS |
683 | scan++; |
684 | scan_byte++; | |
685 | ||
9a21bb64 RS |
686 | } |
687 | endloop: | |
688 | ||
689 | last_known_column = col; | |
6ec8bbd2 | 690 | last_known_column_point = PT; |
9a21bb64 RS |
691 | last_known_column_modified = MODIFF; |
692 | ||
ef6f5c0e SM |
693 | if (goalcol) |
694 | *goalcol = col; | |
695 | if (endpos) | |
696 | *endpos = scan; | |
697 | if (prevcol) | |
698 | *prevcol = prev_col; | |
699 | } | |
700 | ||
701 | /* Return the column number of position POS | |
702 | by scanning forward from the beginning of the line. | |
703 | This function handles characters that are invisible | |
704 | due to text properties or overlays. */ | |
705 | ||
d311d28c | 706 | static ptrdiff_t |
971de7fb | 707 | current_column_1 (void) |
ef6f5c0e SM |
708 | { |
709 | EMACS_INT col = MOST_POSITIVE_FIXNUM; | |
d311d28c | 710 | ptrdiff_t opoint = PT; |
ef6f5c0e SM |
711 | |
712 | scan_for_column (&opoint, &col, NULL); | |
9a21bb64 RS |
713 | return col; |
714 | } | |
715 | \f | |
f4a6687d GM |
716 | |
717 | #if 0 /* Not used. */ | |
718 | ||
c412c808 RS |
719 | /* Return the width in columns of the part of STRING from BEG to END. |
720 | If BEG is nil, that stands for the beginning of STRING. | |
721 | If END is nil, that stands for the end of STRING. */ | |
722 | ||
76e20cb0 | 723 | static double |
1dae0f0a | 724 | string_display_width (Lisp_Object string, Lisp_Object beg, Lisp_Object end) |
c412c808 RS |
725 | { |
726 | register int col; | |
727 | register unsigned char *ptr, *stop; | |
728 | register int tab_seen; | |
729 | int post_tab; | |
730 | register int c; | |
a2271ba2 | 731 | int tab_width = SANE_TAB_WIDTH (current_buffer); |
c412c808 | 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 | 757 | |
c412c808 RS |
758 | col = 0, tab_seen = 0, post_tab = 0; |
759 | ||
760 | while (1) | |
761 | { | |
762 | if (ptr == stop) | |
763 | break; | |
764 | ||
765 | c = *--ptr; | |
766 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
77b37c05 | 767 | col += ASIZE (DISP_CHAR_VECTOR (dp, c)); |
c412c808 RS |
768 | else if (c >= 040 && c < 0177) |
769 | col++; | |
770 | else if (c == '\n') | |
771 | break; | |
772 | else if (c == '\t') | |
773 | { | |
774 | if (tab_seen) | |
775 | col = ((col + tab_width) / tab_width) * tab_width; | |
776 | ||
777 | post_tab += col; | |
778 | col = 0; | |
779 | tab_seen = 1; | |
780 | } | |
781 | else | |
782 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
783 | } | |
784 | ||
785 | if (tab_seen) | |
786 | { | |
787 | col = ((col + tab_width) / tab_width) * tab_width; | |
788 | col += post_tab; | |
789 | } | |
790 | ||
791 | return col; | |
792 | } | |
f4a6687d GM |
793 | |
794 | #endif /* 0 */ | |
795 | ||
c412c808 | 796 | \f |
a7ca3326 | 797 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
8c1a1077 | 798 | doc: /* Indent from point with tabs and spaces until COLUMN is reached. |
7bf120f1 | 799 | Optional second argument MINIMUM says always do at least MINIMUM spaces |
f64f035e EZ |
800 | even if that goes past COLUMN; by default, MINIMUM is zero. |
801 | ||
802 | The return value is COLUMN. */) | |
5842a27b | 803 | (Lisp_Object column, Lisp_Object minimum) |
993b6404 | 804 | { |
7831777b | 805 | EMACS_INT mincol; |
d311d28c | 806 | register ptrdiff_t fromcol; |
a2271ba2 | 807 | int tab_width = SANE_TAB_WIDTH (current_buffer); |
993b6404 | 808 | |
b7826503 | 809 | CHECK_NUMBER (column); |
56a98455 | 810 | if (NILP (minimum)) |
94d92e9c | 811 | XSETFASTINT (minimum, 0); |
b7826503 | 812 | CHECK_NUMBER (minimum); |
993b6404 JB |
813 | |
814 | fromcol = current_column (); | |
815 | mincol = fromcol + XINT (minimum); | |
04c98432 | 816 | if (mincol < XINT (column)) mincol = XINT (column); |
993b6404 JB |
817 | |
818 | if (fromcol == mincol) | |
819 | return make_number (mincol); | |
820 | ||
993b6404 JB |
821 | if (indent_tabs_mode) |
822 | { | |
823 | Lisp_Object n; | |
94d92e9c | 824 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
825 | if (XFASTINT (n) != 0) |
826 | { | |
6d1bd1a5 | 827 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
828 | |
829 | fromcol = (mincol / tab_width) * tab_width; | |
830 | } | |
831 | } | |
832 | ||
04c98432 EN |
833 | XSETFASTINT (column, mincol - fromcol); |
834 | Finsert_char (make_number (' '), column, Qt); | |
993b6404 JB |
835 | |
836 | last_known_column = mincol; | |
6ec8bbd2 | 837 | last_known_column_point = PT; |
993b6404 JB |
838 | last_known_column_modified = MODIFF; |
839 | ||
04c98432 EN |
840 | XSETINT (column, mincol); |
841 | return column; | |
993b6404 | 842 | } |
0aa01123 | 843 | |
993b6404 JB |
844 | \f |
845 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, | |
8c1a1077 PJ |
846 | 0, 0, 0, |
847 | doc: /* Return the indentation of the current line. | |
848 | This is the horizontal position of the character | |
849 | following any initial whitespace. */) | |
5842a27b | 850 | (void) |
993b6404 JB |
851 | { |
852 | Lisp_Object val; | |
d311d28c | 853 | ptrdiff_t opoint = PT, opoint_byte = PT_BYTE; |
fe0066f5 RS |
854 | |
855 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); | |
993b6404 | 856 | |
7831777b | 857 | XSETFASTINT (val, position_indentation (PT_BYTE)); |
fe0066f5 | 858 | SET_PT_BOTH (opoint, opoint_byte); |
993b6404 JB |
859 | return val; |
860 | } | |
861 | ||
d311d28c | 862 | static ptrdiff_t |
3f8236f4 | 863 | position_indentation (ptrdiff_t pos_byte) |
993b6404 | 864 | { |
d311d28c | 865 | register ptrdiff_t column = 0; |
a2271ba2 | 866 | int tab_width = SANE_TAB_WIDTH (current_buffer); |
993b6404 JB |
867 | register unsigned char *p; |
868 | register unsigned char *stop; | |
9a21bb64 | 869 | unsigned char *start; |
d311d28c PE |
870 | ptrdiff_t next_boundary_byte = pos_byte; |
871 | ptrdiff_t ceiling = next_boundary_byte; | |
2ff4775b | 872 | |
fe0066f5 | 873 | p = BYTE_POS_ADDR (pos_byte); |
9a21bb64 RS |
874 | /* STOP records the value of P at which we will need |
875 | to think about the gap, or about invisible text, | |
876 | or about the end of the buffer. */ | |
877 | stop = p; | |
878 | /* START records the starting value of P. */ | |
879 | start = p; | |
993b6404 JB |
880 | while (1) |
881 | { | |
882 | while (p == stop) | |
883 | { | |
d311d28c | 884 | ptrdiff_t stop_pos_byte; |
9a21bb64 | 885 | |
fe0066f5 RS |
886 | /* If we have updated P, set POS_BYTE to match. |
887 | The first time we enter the loop, POS_BYTE is already right. */ | |
9a21bb64 | 888 | if (p != start) |
fe0066f5 | 889 | pos_byte = PTR_BYTE_POS (p); |
9a21bb64 | 890 | /* Consider the various reasons STOP might have been set here. */ |
fe0066f5 | 891 | if (pos_byte == ZV_BYTE) |
993b6404 | 892 | return column; |
fe0066f5 RS |
893 | if (pos_byte == next_boundary_byte) |
894 | { | |
d311d28c PE |
895 | ptrdiff_t next_boundary; |
896 | ptrdiff_t pos = BYTE_TO_CHAR (pos_byte); | |
fe0066f5 RS |
897 | pos = skip_invisible (pos, &next_boundary, ZV, Qnil); |
898 | pos_byte = CHAR_TO_BYTE (pos); | |
899 | next_boundary_byte = CHAR_TO_BYTE (next_boundary); | |
900 | } | |
901 | if (pos_byte >= ceiling) | |
902 | ceiling = BUFFER_CEILING_OF (pos_byte) + 1; | |
9a21bb64 RS |
903 | /* Compute the next place we need to stop and think, |
904 | and set STOP accordingly. */ | |
fe0066f5 | 905 | stop_pos_byte = min (ceiling, next_boundary_byte); |
9a21bb64 | 906 | /* The -1 and +1 arrange to point at the first byte of gap |
fe0066f5 | 907 | (if STOP_POS_BYTE is the position of the gap) |
9a21bb64 | 908 | rather than at the data after the gap. */ |
097812fb | 909 | |
fe0066f5 RS |
910 | stop = BYTE_POS_ADDR (stop_pos_byte - 1) + 1; |
911 | p = BYTE_POS_ADDR (pos_byte); | |
993b6404 JB |
912 | } |
913 | switch (*p++) | |
914 | { | |
fb911777 | 915 | case 0240: |
4b4deea2 | 916 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
fb911777 | 917 | return column; |
993b6404 JB |
918 | case ' ': |
919 | column++; | |
920 | break; | |
921 | case '\t': | |
922 | column += tab_width - column % tab_width; | |
923 | break; | |
924 | default: | |
fb911777 | 925 | if (ASCII_BYTE_P (p[-1]) |
4b4deea2 | 926 | || NILP (BVAR (current_buffer, enable_multibyte_characters))) |
fb911777 KH |
927 | return column; |
928 | { | |
fe0066f5 RS |
929 | int c; |
930 | pos_byte = PTR_BYTE_POS (p - 1); | |
931 | c = FETCH_MULTIBYTE_CHAR (pos_byte); | |
fb911777 KH |
932 | if (CHAR_HAS_CATEGORY (c, ' ')) |
933 | { | |
934 | column++; | |
fe0066f5 RS |
935 | INC_POS (pos_byte); |
936 | p = BYTE_POS_ADDR (pos_byte); | |
fb911777 KH |
937 | } |
938 | else | |
939 | return column; | |
940 | } | |
993b6404 JB |
941 | } |
942 | } | |
943 | } | |
1b15e576 KH |
944 | |
945 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
946 | Blank lines are treated as if they had the same indentation as the | |
947 | preceding line. */ | |
fe0066f5 | 948 | |
1b15e576 | 949 | int |
d311d28c | 950 | indented_beyond_p (ptrdiff_t pos, ptrdiff_t pos_byte, EMACS_INT column) |
1b15e576 | 951 | { |
d311d28c PE |
952 | ptrdiff_t val; |
953 | ptrdiff_t opoint = PT, opoint_byte = PT_BYTE; | |
fe0066f5 RS |
954 | |
955 | SET_PT_BOTH (pos, pos_byte); | |
956 | while (PT > BEGV && FETCH_BYTE (PT_BYTE) == '\n') | |
957 | scan_newline (PT - 1, PT_BYTE - 1, BEGV, BEGV_BYTE, -1, 0); | |
958 | ||
d5d6f706 | 959 | val = position_indentation (PT_BYTE); |
fe0066f5 | 960 | SET_PT_BOTH (opoint, opoint_byte); |
7831777b | 961 | return val >= column; |
1b15e576 | 962 | } |
993b6404 | 963 | \f |
c25df26e | 964 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, |
c6e571fb | 965 | "NMove to column: ", |
8c1a1077 | 966 | doc: /* Move point to column COLUMN in the current line. |
3c860543 | 967 | Interactively, COLUMN is the value of prefix numeric argument. |
8c1a1077 PJ |
968 | The column of a character is calculated by adding together the widths |
969 | as displayed of the previous characters in the line. | |
970 | This function ignores line-continuation; | |
971 | there is no upper limit on the column number a character can have | |
972 | and horizontal scrolling has no effect. | |
973 | ||
974 | If specified column is within a character, point goes after that character. | |
975 | If it's past end of line, point goes to end of line. | |
976 | ||
3c860543 EZ |
977 | Optional second argument FORCE non-nil means if COLUMN is in the |
978 | middle of a tab character, change it to spaces. | |
979 | In addition, if FORCE is t, and the line is too short to reach | |
980 | COLUMN, add spaces/tabs to get there. | |
8c1a1077 PJ |
981 | |
982 | The return value is the current column. */) | |
5842a27b | 983 | (Lisp_Object column, Lisp_Object force) |
993b6404 | 984 | { |
d311d28c PE |
985 | ptrdiff_t pos, prev_col; |
986 | EMACS_INT col; | |
ef6f5c0e | 987 | EMACS_INT goal; |
fe0066f5 | 988 | |
b7826503 | 989 | CHECK_NATNUM (column); |
993b6404 JB |
990 | goal = XINT (column); |
991 | ||
ef6f5c0e SM |
992 | col = goal; |
993 | pos = ZV; | |
994 | scan_for_column (&pos, &col, &prev_col); | |
993b6404 | 995 | |
ef6f5c0e | 996 | SET_PT (pos); |
4c669c09 | 997 | |
ef6f5c0e SM |
998 | /* If a tab char made us overshoot, change it to spaces |
999 | and scan through it again. */ | |
1000 | if (!NILP (force) && col > goal) | |
993b6404 | 1001 | { |
4c92f429 | 1002 | int c; |
d311d28c | 1003 | ptrdiff_t pos_byte = PT_BYTE; |
d6e483a4 | 1004 | |
4c92f429 AS |
1005 | DEC_POS (pos_byte); |
1006 | c = FETCH_CHAR (pos_byte); | |
ef6f5c0e | 1007 | if (c == '\t' && prev_col < goal) |
d6e483a4 | 1008 | { |
d311d28c | 1009 | ptrdiff_t goal_pt, goal_pt_byte; |
ef6f5c0e SM |
1010 | |
1011 | /* Insert spaces in front of the tab to reach GOAL. Do this | |
1012 | first so that a marker at the end of the tab gets | |
1013 | adjusted. */ | |
1014 | SET_PT_BOTH (PT - 1, PT_BYTE - 1); | |
1015 | Finsert_char (make_number (' '), make_number (goal - prev_col), Qt); | |
1016 | ||
1017 | /* Now delete the tab, and indent to COL. */ | |
1018 | del_range (PT, PT + 1); | |
1019 | goal_pt = PT; | |
1020 | goal_pt_byte = PT_BYTE; | |
1021 | Findent_to (make_number (col), Qnil); | |
1022 | SET_PT_BOTH (goal_pt, goal_pt_byte); | |
1023 | ||
1024 | /* Set the last_known... vars consistently. */ | |
1025 | col = goal; | |
a997a7ca | 1026 | } |
993b6404 JB |
1027 | } |
1028 | ||
1029 | /* If line ends prematurely, add space to the end. */ | |
de4075cf | 1030 | if (col < goal && EQ (force, Qt)) |
230a4cbd | 1031 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
1032 | |
1033 | last_known_column = col; | |
6ec8bbd2 | 1034 | last_known_column_point = PT; |
993b6404 JB |
1035 | last_known_column_modified = MODIFF; |
1036 | ||
ef6f5c0e | 1037 | return make_number (col); |
993b6404 JB |
1038 | } |
1039 | \f | |
0aa01123 JB |
1040 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
1041 | ||
9306c32e | 1042 | static struct position val_compute_motion; |
993b6404 JB |
1043 | |
1044 | /* Scan the current buffer forward from offset FROM, pretending that | |
1045 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
1046 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
1047 | and return the ending buffer position and screen location. If we |
1048 | can't hit the requested column exactly (because of a tab or other | |
1049 | multi-column character), overshoot. | |
993b6404 | 1050 | |
2ab90d49 KH |
1051 | DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings |
1052 | at FROM. This is the case if FROMVPOS and FROMVPOS came from an | |
1053 | earlier call to compute_motion. The other common case is that FROMHPOS | |
1054 | is zero and FROM is a position that "belongs" at column zero, but might | |
1055 | be shifted by overlay strings; in this case DID_MOTION should be 0. | |
1056 | ||
993b6404 JB |
1057 | WIDTH is the number of columns available to display text; |
1058 | compute_motion uses this to handle continuation lines and such. | |
361f14bf KS |
1059 | If WIDTH is -1, use width of window's text area adjusted for |
1060 | continuation glyph when needed. | |
1061 | ||
993b6404 JB |
1062 | HSCROLL is the number of columns not being displayed at the left |
1063 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
1064 | TAB_OFFSET is the number of columns of the first tab that aren't |
1065 | being displayed, perhaps because of a continuation line or | |
1066 | something. | |
993b6404 JB |
1067 | |
1068 | compute_motion returns a pointer to a struct position. The bufpos | |
1069 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
1070 | and vpos give its cartesian location. prevhpos is the column at |
1071 | which the character before bufpos started, and contin is non-zero | |
1072 | if we reached the current line by continuing the previous. | |
1073 | ||
1074 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
1075 | columns, taking HSCROLL and the truncation glyph at the left margin | |
1076 | into account. That is, beginning-of-line moves you to the hpos | |
1077 | -HSCROLL + (HSCROLL > 0). | |
993b6404 JB |
1078 | |
1079 | For example, to find the buffer position of column COL of line LINE | |
1080 | of a certain window, pass the window's starting location as FROM | |
1081 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
1082 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
1083 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
2ff4775b | 1084 | TOHPOS. |
993b6404 JB |
1085 | |
1086 | When displaying in window w, a typical formula for WIDTH is: | |
1087 | ||
1088 | window_width - 1 | |
a3c87d4e | 1089 | - (has_vertical_scroll_bars |
90022f5a KS |
1090 | ? WINDOW_CONFIG_SCROLL_BAR_COLS (window) |
1091 | : (window_width + window_left != frame_cols)) | |
993b6404 JB |
1092 | |
1093 | where | |
90022f5a KS |
1094 | window_width is XFASTINT (w->total_cols), |
1095 | window_left is XFASTINT (w->left_col), | |
a3c87d4e | 1096 | has_vertical_scroll_bars is |
90022f5a KS |
1097 | WINDOW_HAS_VERTICAL_SCROLL_BAR (window) |
1098 | and frame_cols = FRAME_COLS (XFRAME (window->frame)) | |
993b6404 | 1099 | |
abde8f8c MR |
1100 | Or you can let window_body_cols do this all for you, and write: |
1101 | window_body_cols (w) - 1 | |
fa61c701 JB |
1102 | |
1103 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 1104 | accounts for window borders if the window is split horizontally, and |
1827d036 | 1105 | the scroll bars if they are turned on. */ |
993b6404 JB |
1106 | |
1107 | struct position * | |
d311d28c | 1108 | compute_motion (ptrdiff_t from, EMACS_INT fromvpos, EMACS_INT fromhpos, int did_motion, ptrdiff_t to, EMACS_INT tovpos, EMACS_INT tohpos, EMACS_INT width, ptrdiff_t hscroll, int tab_offset, struct window *win) |
993b6404 | 1109 | { |
83155776 SM |
1110 | register EMACS_INT hpos = fromhpos; |
1111 | register EMACS_INT vpos = fromvpos; | |
cde9337b | 1112 | |
d311d28c PE |
1113 | register ptrdiff_t pos; |
1114 | ptrdiff_t pos_byte; | |
6bbd7a29 | 1115 | register int c = 0; |
a2271ba2 | 1116 | int tab_width = SANE_TAB_WIDTH (current_buffer); |
4b4deea2 | 1117 | register int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow)); |
d44f12b4 | 1118 | register struct Lisp_Char_Table *dp = window_display_table (win); |
7831777b | 1119 | EMACS_INT selective |
4b4deea2 TT |
1120 | = (INTEGERP (BVAR (current_buffer, selective_display)) |
1121 | ? XINT (BVAR (current_buffer, selective_display)) | |
1122 | : !NILP (BVAR (current_buffer, selective_display)) ? -1 : 0); | |
d311d28c | 1123 | ptrdiff_t selective_rlen |
eeaafd4f | 1124 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
77b37c05 | 1125 | ? ASIZE (DISP_INVIS_VECTOR (dp)) : 0); |
2ab90d49 KH |
1126 | /* The next location where the `invisible' property changes, or an |
1127 | overlay starts or ends. */ | |
d311d28c | 1128 | ptrdiff_t next_boundary = from; |
993b6404 | 1129 | |
0aa01123 JB |
1130 | /* For computing runs of characters with similar widths. |
1131 | Invariant: width_run_width is zero, or all the characters | |
2ff4775b | 1132 | from width_run_start to width_run_end have a fixed width of |
0aa01123 | 1133 | width_run_width. */ |
d311d28c PE |
1134 | ptrdiff_t width_run_start = from; |
1135 | ptrdiff_t width_run_end = from; | |
1136 | ptrdiff_t width_run_width = 0; | |
0aa01123 JB |
1137 | Lisp_Object *width_table; |
1138 | ||
1139 | /* The next buffer pos where we should consult the width run cache. */ | |
d311d28c | 1140 | ptrdiff_t next_width_run = from; |
0e435804 | 1141 | Lisp_Object window; |
0aa01123 | 1142 | |
4b4deea2 | 1143 | int multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters)); |
c71c19f4 RS |
1144 | /* If previous char scanned was a wide character, |
1145 | this is the column where it ended. Otherwise, this is 0. */ | |
83155776 | 1146 | EMACS_INT wide_column_end_hpos = 0; |
d311d28c PE |
1147 | ptrdiff_t prev_pos; /* Previous buffer position. */ |
1148 | ptrdiff_t prev_pos_byte; /* Previous buffer position. */ | |
83155776 SM |
1149 | EMACS_INT prev_hpos = 0; |
1150 | EMACS_INT prev_vpos = 0; | |
1151 | EMACS_INT contin_hpos; /* HPOS of last column of continued line. */ | |
d311d28c PE |
1152 | int prev_tab_offset; /* Previous tab offset. */ |
1153 | int continuation_glyph_width; | |
a997a7ca | 1154 | |
d6721dda KH |
1155 | struct composition_it cmp_it; |
1156 | ||
0e435804 | 1157 | XSETWINDOW (window, win); |
66c75ca5 | 1158 | |
0aa01123 JB |
1159 | width_run_cache_on_off (); |
1160 | if (dp == buffer_display_table ()) | |
4b4deea2 TT |
1161 | width_table = (VECTORP (BVAR (current_buffer, width_table)) |
1162 | ? XVECTOR (BVAR (current_buffer, width_table))->contents | |
0aa01123 JB |
1163 | : 0); |
1164 | else | |
1165 | /* If the window has its own display table, we can't use the width | |
1166 | run cache, because that's based on the buffer's display table. */ | |
1167 | width_table = 0; | |
1168 | ||
361f14bf KS |
1169 | /* Negative width means use all available text columns. */ |
1170 | if (width < 0) | |
1171 | { | |
abde8f8c | 1172 | width = window_body_cols (win); |
361f14bf KS |
1173 | /* We must make room for continuation marks if we don't have fringes. */ |
1174 | #ifdef HAVE_WINDOW_SYSTEM | |
d3d50620 | 1175 | if (!FRAME_WINDOW_P (XFRAME (win->frame))) |
361f14bf KS |
1176 | #endif |
1177 | width -= 1; | |
1178 | } | |
1179 | ||
8cc08515 | 1180 | continuation_glyph_width = 1; |
ed5c373c | 1181 | #ifdef HAVE_WINDOW_SYSTEM |
d3d50620 | 1182 | if (FRAME_WINDOW_P (XFRAME (win->frame))) |
8cc08515 | 1183 | continuation_glyph_width = 0; /* In the fringe. */ |
ed5c373c KS |
1184 | #endif |
1185 | ||
e4500116 GM |
1186 | immediate_quit = 1; |
1187 | QUIT; | |
cde9337b | 1188 | |
a997a7ca | 1189 | pos = prev_pos = from; |
fe0066f5 | 1190 | pos_byte = prev_pos_byte = CHAR_TO_BYTE (from); |
a997a7ca KH |
1191 | contin_hpos = 0; |
1192 | prev_tab_offset = tab_offset; | |
72af86bd | 1193 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
1194 | cmp_it.id = -1; |
1195 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, Qnil); | |
1196 | ||
2ab90d49 KH |
1197 | while (1) |
1198 | { | |
1199 | while (pos == next_boundary) | |
f75c0f8a | 1200 | { |
d311d28c PE |
1201 | ptrdiff_t pos_here = pos; |
1202 | ptrdiff_t newpos; | |
98136db3 | 1203 | |
f9ba10b0 | 1204 | /* Don't skip invisible if we are already at the margin. */ |
8a00d895 | 1205 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
f9ba10b0 RS |
1206 | { |
1207 | if (contin_hpos && prev_hpos == 0 | |
1208 | && hpos > tohpos | |
1209 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
1210 | { /* Line breaks because we can't put the character at the | |
1211 | previous line any more. It is not the multi-column | |
1212 | character continued in middle. Go back to previous | |
1213 | buffer position, screen position, and set tab offset | |
1214 | to previous value. It's the beginning of the | |
1215 | line. */ | |
1216 | pos = prev_pos; | |
1217 | pos_byte = prev_pos_byte; | |
1218 | hpos = prev_hpos; | |
6b61353c | 1219 | vpos = prev_vpos; |
f9ba10b0 RS |
1220 | tab_offset = prev_tab_offset; |
1221 | } | |
1222 | break; | |
1223 | } | |
1224 | ||
2ab90d49 KH |
1225 | /* If the caller says that the screen position came from an earlier |
1226 | call to compute_motion, then we've already accounted for the | |
1227 | overlay strings at point. This is only true the first time | |
1228 | through, so clear the flag after testing it. */ | |
1229 | if (!did_motion) | |
1230 | /* We need to skip past the overlay strings. Currently those | |
a997a7ca | 1231 | strings must not contain TAB; |
2ab90d49 KH |
1232 | if we want to relax that restriction, something will have |
1233 | to be changed here. */ | |
a997a7ca KH |
1234 | { |
1235 | unsigned char *ovstr; | |
d311d28c | 1236 | ptrdiff_t ovlen = overlay_strings (pos, win, &ovstr); |
4116deee | 1237 | hpos += ((multibyte && ovlen > 0) |
7469ef5d | 1238 | ? strwidth ((char *) ovstr, ovlen) : ovlen); |
a997a7ca | 1239 | } |
2ab90d49 KH |
1240 | did_motion = 0; |
1241 | ||
1242 | if (pos >= to) | |
1243 | break; | |
66c75ca5 | 1244 | |
9a21bb64 RS |
1245 | /* Advance POS past invisible characters |
1246 | (but not necessarily all that there are here), | |
1247 | and store in next_boundary the next position where | |
1248 | we need to call skip_invisible. */ | |
98136db3 RS |
1249 | newpos = skip_invisible (pos, &next_boundary, to, window); |
1250 | ||
1251 | if (newpos >= to) | |
e8cb089b RS |
1252 | { |
1253 | pos = min (to, newpos); | |
bcfbd63d | 1254 | pos_byte = CHAR_TO_BYTE (pos); |
e8cb089b RS |
1255 | goto after_loop; |
1256 | } | |
98136db3 | 1257 | |
fe0066f5 RS |
1258 | if (newpos != pos_here) |
1259 | { | |
1260 | pos = newpos; | |
1261 | pos_byte = CHAR_TO_BYTE (pos); | |
1262 | } | |
f75c0f8a | 1263 | } |
2ab90d49 KH |
1264 | |
1265 | /* Handle right margin. */ | |
a997a7ca KH |
1266 | /* Note on a wide-column character. |
1267 | ||
1268 | Characters are classified into the following three categories | |
1269 | according to the width (columns occupied on screen). | |
1270 | ||
1271 | (1) single-column character: ex. `a' | |
1272 | (2) multi-column character: ex. `^A', TAB, `\033' | |
1273 | (3) wide-column character: ex. Japanese character, Chinese character | |
1274 | (In the following example, `W_' stands for them.) | |
1275 | ||
1276 | Multi-column characters can be divided around the right margin, | |
1277 | but wide-column characters cannot. | |
1278 | ||
1279 | NOTE: | |
1280 | ||
1281 | (*) The cursor is placed on the next character after the point. | |
1282 | ||
1283 | ---------- | |
1284 | abcdefghi\ | |
1285 | j ^---- next after the point | |
1286 | ^--- next char. after the point. | |
1287 | ---------- | |
1288 | In case of sigle-column character | |
1289 | ||
1290 | ---------- | |
1291 | abcdefgh\\ | |
1292 | 033 ^---- next after the point, next char. after the point. | |
1293 | ---------- | |
1294 | In case of multi-column character | |
1295 | ||
1296 | ---------- | |
1297 | abcdefgh\\ | |
1298 | W_ ^---- next after the point | |
1299 | ^---- next char. after the point. | |
1300 | ---------- | |
097812fb | 1301 | In case of wide-column character |
a997a7ca KH |
1302 | |
1303 | The problem here is continuation at a wide-column character. | |
1304 | In this case, the line may shorter less than WIDTH. | |
1305 | And we find the continuation AFTER it occurs. | |
1306 | ||
1307 | */ | |
1308 | ||
1309 | if (hpos > width) | |
2ab90d49 | 1310 | { |
d311d28c | 1311 | EMACS_INT total_width = width + continuation_glyph_width; |
81b6a665 CY |
1312 | int truncate = 0; |
1313 | ||
1314 | if (!NILP (Vtruncate_partial_width_windows) | |
1315 | && (total_width < FRAME_COLS (XFRAME (WINDOW_FRAME (win))))) | |
1316 | { | |
1317 | if (INTEGERP (Vtruncate_partial_width_windows)) | |
1318 | truncate | |
1319 | = total_width < XFASTINT (Vtruncate_partial_width_windows); | |
1320 | else | |
1321 | truncate = 1; | |
1322 | } | |
1323 | ||
1324 | if (hscroll || truncate | |
4b4deea2 | 1325 | || !NILP (BVAR (current_buffer, truncate_lines))) |
2ab90d49 | 1326 | { |
529724fe AS |
1327 | /* Truncating: skip to newline, unless we are already past |
1328 | TO (we need to go back below). */ | |
1329 | if (pos <= to) | |
fe0066f5 RS |
1330 | { |
1331 | pos = find_before_next_newline (pos, to, 1); | |
1332 | pos_byte = CHAR_TO_BYTE (pos); | |
529724fe AS |
1333 | hpos = width; |
1334 | /* If we just skipped next_boundary, | |
1335 | loop around in the main while | |
1336 | and handle it. */ | |
1337 | if (pos >= next_boundary) | |
1338 | next_boundary = pos + 1; | |
1339 | prev_hpos = width; | |
6b61353c | 1340 | prev_vpos = vpos; |
529724fe | 1341 | prev_tab_offset = tab_offset; |
fe0066f5 | 1342 | } |
2ab90d49 KH |
1343 | } |
1344 | else | |
1345 | { | |
1346 | /* Continuing. */ | |
a997a7ca KH |
1347 | /* Remember the previous value. */ |
1348 | prev_tab_offset = tab_offset; | |
1349 | ||
c9c0f7cf | 1350 | if (wide_column_end_hpos > width) |
a997a7ca KH |
1351 | { |
1352 | hpos -= prev_hpos; | |
1353 | tab_offset += prev_hpos; | |
1354 | } | |
1355 | else | |
1356 | { | |
1357 | tab_offset += width; | |
1358 | hpos -= width; | |
1359 | } | |
1360 | vpos++; | |
1361 | contin_hpos = prev_hpos; | |
1362 | prev_hpos = 0; | |
6cbc951e | 1363 | prev_vpos = vpos; |
2ab90d49 KH |
1364 | } |
1365 | } | |
1366 | ||
1367 | /* Stop if past the target buffer position or screen position. */ | |
33fe7d20 | 1368 | if (pos > to) |
a997a7ca KH |
1369 | { |
1370 | /* Go back to the previous position. */ | |
1371 | pos = prev_pos; | |
fe0066f5 | 1372 | pos_byte = prev_pos_byte; |
a997a7ca | 1373 | hpos = prev_hpos; |
6b61353c | 1374 | vpos = prev_vpos; |
a997a7ca KH |
1375 | tab_offset = prev_tab_offset; |
1376 | ||
1377 | /* NOTE on contin_hpos, hpos, and prev_hpos. | |
1378 | ||
1379 | ---------- | |
1380 | abcdefgh\\ | |
1381 | W_ ^---- contin_hpos | |
1382 | | ^----- hpos | |
1383 | \---- prev_hpos | |
1384 | ---------- | |
1385 | */ | |
1386 | ||
1387 | if (contin_hpos && prev_hpos == 0 | |
c9c0f7cf | 1388 | && contin_hpos < width && !wide_column_end_hpos) |
a997a7ca KH |
1389 | { |
1390 | /* Line breaking occurs in the middle of multi-column | |
1391 | character. Go back to previous line. */ | |
1392 | hpos = contin_hpos; | |
1393 | vpos = vpos - 1; | |
1394 | } | |
a997a7ca KH |
1395 | break; |
1396 | } | |
1397 | ||
8a00d895 | 1398 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
33fe7d20 RS |
1399 | { |
1400 | if (contin_hpos && prev_hpos == 0 | |
9129bcc3 KH |
1401 | && hpos > tohpos |
1402 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
33fe7d20 RS |
1403 | { /* Line breaks because we can't put the character at the |
1404 | previous line any more. It is not the multi-column | |
1405 | character continued in middle. Go back to previous | |
1406 | buffer position, screen position, and set tab offset | |
1407 | to previous value. It's the beginning of the | |
1408 | line. */ | |
1409 | pos = prev_pos; | |
1410 | pos_byte = prev_pos_byte; | |
1411 | hpos = prev_hpos; | |
6b61353c | 1412 | vpos = prev_vpos; |
33fe7d20 RS |
1413 | tab_offset = prev_tab_offset; |
1414 | } | |
1415 | break; | |
1416 | } | |
a997a7ca | 1417 | if (pos == ZV) /* We cannot go beyond ZV. Stop here. */ |
2ab90d49 KH |
1418 | break; |
1419 | ||
2ab90d49 | 1420 | prev_hpos = hpos; |
6b61353c | 1421 | prev_vpos = vpos; |
a997a7ca | 1422 | prev_pos = pos; |
fe0066f5 | 1423 | prev_pos_byte = pos_byte; |
c9c0f7cf | 1424 | wide_column_end_hpos = 0; |
0aa01123 JB |
1425 | |
1426 | /* Consult the width run cache to see if we can avoid inspecting | |
1427 | the text character-by-character. */ | |
1428 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
1429 | { | |
0065d054 | 1430 | ptrdiff_t run_end; |
0aa01123 JB |
1431 | int common_width |
1432 | = region_cache_forward (current_buffer, | |
1433 | current_buffer->width_run_cache, | |
1434 | pos, &run_end); | |
1435 | ||
1436 | /* A width of zero means the character's width varies (like | |
1437 | a tab), is meaningless (like a newline), or we just don't | |
1438 | want to skip over it for some other reason. */ | |
1439 | if (common_width != 0) | |
1440 | { | |
d311d28c | 1441 | ptrdiff_t run_end_hpos; |
0aa01123 JB |
1442 | |
1443 | /* Don't go past the final buffer posn the user | |
1444 | requested. */ | |
1445 | if (run_end > to) | |
1446 | run_end = to; | |
1447 | ||
1448 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1449 | ||
1450 | /* Don't go past the final horizontal position the user | |
1451 | requested. */ | |
1452 | if (vpos == tovpos && run_end_hpos > tohpos) | |
1453 | { | |
1454 | run_end = pos + (tohpos - hpos) / common_width; | |
1455 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1456 | } | |
2ff4775b | 1457 | |
0aa01123 JB |
1458 | /* Don't go past the margin. */ |
1459 | if (run_end_hpos >= width) | |
1460 | { | |
1461 | run_end = pos + (width - hpos) / common_width; | |
1462 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1463 | } | |
1464 | ||
1465 | hpos = run_end_hpos; | |
1466 | if (run_end > pos) | |
1467 | prev_hpos = hpos - common_width; | |
fe0066f5 RS |
1468 | if (pos != run_end) |
1469 | { | |
1470 | pos = run_end; | |
1471 | pos_byte = CHAR_TO_BYTE (pos); | |
1472 | } | |
0aa01123 JB |
1473 | } |
1474 | ||
1475 | next_width_run = run_end + 1; | |
1476 | } | |
1477 | ||
1478 | /* We have to scan the text character-by-character. */ | |
993b6404 | 1479 | else |
2ab90d49 | 1480 | { |
d311d28c | 1481 | ptrdiff_t i, n; |
88c6e37e | 1482 | Lisp_Object charvec; |
097812fb | 1483 | |
012fd715 | 1484 | /* Check composition sequence. */ |
d6721dda KH |
1485 | if (cmp_it.id >= 0 |
1486 | || (pos == cmp_it.stop_pos | |
1487 | && composition_reseat_it (&cmp_it, pos, pos_byte, to, win, | |
1488 | NULL, Qnil))) | |
1489 | composition_update_it (&cmp_it, pos, pos_byte, Qnil); | |
1490 | if (cmp_it.id >= 0) | |
1491 | { | |
1492 | pos += cmp_it.nchars; | |
1493 | pos_byte += cmp_it.nbytes; | |
1494 | hpos += cmp_it.width; | |
1495 | if (cmp_it.to == cmp_it.nglyphs) | |
1496 | { | |
1497 | cmp_it.id = -1; | |
1498 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, | |
1499 | Qnil); | |
1500 | } | |
1501 | else | |
1502 | cmp_it.from = cmp_it.to; | |
1503 | continue; | |
1504 | } | |
012fd715 | 1505 | |
d6721dda | 1506 | c = FETCH_BYTE (pos_byte); |
fe0066f5 | 1507 | pos++, pos_byte++; |
0aa01123 | 1508 | |
2ab90d49 KH |
1509 | /* Perhaps add some info to the width_run_cache. */ |
1510 | if (current_buffer->width_run_cache) | |
1511 | { | |
1512 | /* Is this character part of the current run? If so, extend | |
1513 | the run. */ | |
1514 | if (pos - 1 == width_run_end | |
5db0afb7 | 1515 | && XFASTINT (width_table[c]) == width_run_width) |
2ab90d49 KH |
1516 | width_run_end = pos; |
1517 | ||
1518 | /* The previous run is over, since this is a character at a | |
1519 | different position, or a different width. */ | |
1520 | else | |
1521 | { | |
1522 | /* Have we accumulated a run to put in the cache? | |
1523 | (Currently, we only cache runs of width == 1). */ | |
1524 | if (width_run_start < width_run_end | |
1525 | && width_run_width == 1) | |
1526 | know_region_cache (current_buffer, | |
1527 | current_buffer->width_run_cache, | |
1528 | width_run_start, width_run_end); | |
1529 | ||
1530 | /* Start recording a new width run. */ | |
5db0afb7 | 1531 | width_run_width = XFASTINT (width_table[c]); |
2ab90d49 KH |
1532 | width_run_start = pos - 1; |
1533 | width_run_end = pos; | |
1534 | } | |
1535 | } | |
993b6404 | 1536 | |
c9c0f7cf | 1537 | if (dp != 0 |
409f2919 | 1538 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 1539 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
993b6404 | 1540 | { |
88c6e37e GM |
1541 | charvec = DISP_CHAR_VECTOR (dp, c); |
1542 | n = ASIZE (charvec); | |
993b6404 | 1543 | } |
88c6e37e | 1544 | else |
993b6404 | 1545 | { |
88c6e37e GM |
1546 | charvec = Qnil; |
1547 | n = 1; | |
1548 | } | |
1549 | ||
fa819fed | 1550 | for (i = 0; i < n; ++i) |
88c6e37e GM |
1551 | { |
1552 | if (VECTORP (charvec)) | |
2ab90d49 | 1553 | { |
88c6e37e GM |
1554 | /* This should be handled the same as |
1555 | next_element_from_display_vector does it. */ | |
1556 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 1557 | |
d311d28c | 1558 | if (GLYPH_CODE_P (entry)) |
f59836fe | 1559 | c = GLYPH_CODE_CHAR (entry); |
88c6e37e GM |
1560 | else |
1561 | c = ' '; | |
1562 | } | |
097812fb | 1563 | |
88c6e37e GM |
1564 | if (c >= 040 && c < 0177) |
1565 | hpos++; | |
1566 | else if (c == '\t') | |
1567 | { | |
1568 | int tem = ((hpos + tab_offset + hscroll - (hscroll > 0)) | |
1569 | % tab_width); | |
1570 | if (tem < 0) | |
1571 | tem += tab_width; | |
1572 | hpos += tab_width - tem; | |
1573 | } | |
1574 | else if (c == '\n') | |
1575 | { | |
1576 | if (selective > 0 | |
7831777b | 1577 | && indented_beyond_p (pos, pos_byte, selective)) |
2ab90d49 | 1578 | { |
88c6e37e GM |
1579 | /* If (pos == to), we don't have to take care of |
1580 | selective display. */ | |
1581 | if (pos < to) | |
fe0066f5 | 1582 | { |
88c6e37e GM |
1583 | /* Skip any number of invisible lines all at once */ |
1584 | do | |
1585 | { | |
1586 | pos = find_before_next_newline (pos, to, 1); | |
1587 | if (pos < to) | |
1588 | pos++; | |
1589 | pos_byte = CHAR_TO_BYTE (pos); | |
1590 | } | |
1591 | while (pos < to | |
097812fb | 1592 | && indented_beyond_p (pos, pos_byte, |
7831777b | 1593 | selective)); |
88c6e37e GM |
1594 | /* Allow for the " ..." that is displayed for them. */ |
1595 | if (selective_rlen) | |
1596 | { | |
1597 | hpos += selective_rlen; | |
1598 | if (hpos >= width) | |
1599 | hpos = width; | |
1600 | } | |
1601 | DEC_BOTH (pos, pos_byte); | |
1602 | /* We have skipped the invis text, but not the | |
1603 | newline after. */ | |
fe0066f5 | 1604 | } |
2ab90d49 | 1605 | } |
88c6e37e GM |
1606 | else |
1607 | { | |
1608 | /* A visible line. */ | |
1609 | vpos++; | |
1610 | hpos = 0; | |
1611 | hpos -= hscroll; | |
1612 | /* Count the truncation glyph on column 0 */ | |
1613 | if (hscroll > 0) | |
ed5c373c | 1614 | hpos += continuation_glyph_width; |
88c6e37e GM |
1615 | tab_offset = 0; |
1616 | } | |
1617 | contin_hpos = 0; | |
2ab90d49 | 1618 | } |
88c6e37e | 1619 | else if (c == CR && selective < 0) |
fe0066f5 | 1620 | { |
88c6e37e GM |
1621 | /* In selective display mode, |
1622 | everything from a ^M to the end of the line is invisible. | |
1623 | Stop *before* the real newline. */ | |
1624 | if (pos < to) | |
1625 | { | |
1626 | pos = find_before_next_newline (pos, to, 1); | |
1627 | pos_byte = CHAR_TO_BYTE (pos); | |
1628 | } | |
1629 | /* If we just skipped next_boundary, | |
1630 | loop around in the main while | |
1631 | and handle it. */ | |
1632 | if (pos > next_boundary) | |
1633 | next_boundary = pos; | |
1634 | /* Allow for the " ..." that is displayed for them. */ | |
1635 | if (selective_rlen) | |
1636 | { | |
1637 | hpos += selective_rlen; | |
1638 | if (hpos >= width) | |
1639 | hpos = width; | |
1640 | } | |
fe0066f5 | 1641 | } |
409f2919 | 1642 | else if (multibyte && LEADING_CODE_P (c)) |
2ab90d49 | 1643 | { |
88c6e37e GM |
1644 | /* Start of multi-byte form. */ |
1645 | unsigned char *ptr; | |
c59478bc | 1646 | int mb_bytes, mb_width; |
88c6e37e GM |
1647 | |
1648 | pos_byte--; /* rewind POS_BYTE */ | |
1649 | ptr = BYTE_POS_ADDR (pos_byte); | |
85f24f61 PE |
1650 | MULTIBYTE_BYTES_WIDTH (ptr, dp, mb_bytes, mb_width); |
1651 | pos_byte += mb_bytes; | |
c59478bc PE |
1652 | if (mb_width > 1 && BYTES_BY_CHAR_HEAD (*ptr) == mb_bytes) |
1653 | wide_column_end_hpos = hpos + mb_width; | |
85f24f61 | 1654 | hpos += mb_width; |
2ab90d49 | 1655 | } |
f1004faf GM |
1656 | else if (VECTORP (charvec)) |
1657 | ++hpos; | |
88c6e37e GM |
1658 | else |
1659 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
2ab90d49 | 1660 | } |
993b6404 JB |
1661 | } |
1662 | } | |
1663 | ||
98136db3 RS |
1664 | after_loop: |
1665 | ||
0aa01123 JB |
1666 | /* Remember any final width run in the cache. */ |
1667 | if (current_buffer->width_run_cache | |
1668 | && width_run_width == 1 | |
1669 | && width_run_start < width_run_end) | |
1670 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
1671 | width_run_start, width_run_end); | |
1672 | ||
993b6404 | 1673 | val_compute_motion.bufpos = pos; |
fe0066f5 | 1674 | val_compute_motion.bytepos = pos_byte; |
cde9337b JB |
1675 | val_compute_motion.hpos = hpos; |
1676 | val_compute_motion.vpos = vpos; | |
ef3af330 AS |
1677 | if (contin_hpos && prev_hpos == 0) |
1678 | val_compute_motion.prevhpos = contin_hpos; | |
1679 | else | |
1680 | val_compute_motion.prevhpos = prev_hpos; | |
993b6404 JB |
1681 | |
1682 | /* Nonzero if have just continued a line */ | |
a997a7ca | 1683 | val_compute_motion.contin = (contin_hpos && prev_hpos == 0); |
993b6404 | 1684 | |
e4500116 | 1685 | immediate_quit = 0; |
993b6404 JB |
1686 | return &val_compute_motion; |
1687 | } | |
993b6404 | 1688 | |
8720a429 | 1689 | |
88af3af4 | 1690 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
8c1a1077 PJ |
1691 | doc: /* Scan through the current buffer, calculating screen position. |
1692 | Scan the current buffer forward from offset FROM, | |
1693 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
1694 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
1695 | and return the ending buffer position and screen location. | |
1696 | ||
361f14bf KS |
1697 | If TOPOS is nil, the actual width and height of the window's |
1698 | text area are used. | |
1699 | ||
8c1a1077 PJ |
1700 | There are three additional arguments: |
1701 | ||
1702 | WIDTH is the number of columns available to display text; | |
361f14bf KS |
1703 | this affects handling of continuation lines. A value of nil |
1704 | corresponds to the actual number of available text columns. | |
8c1a1077 PJ |
1705 | |
1706 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
1707 | HSCROLL is the number of columns not being displayed at the left | |
1708 | margin; this is usually taken from a window's hscroll member. | |
1709 | TAB-OFFSET is the number of columns of the first tab that aren't | |
1710 | being displayed, perhaps because the line was continued within it. | |
1711 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
1712 | ||
1713 | WINDOW is the window to operate on. It is used to choose the display table; | |
1714 | if it is showing the current buffer, it is used also for | |
1715 | deciding which overlay properties apply. | |
1716 | Note that `compute-motion' always operates on the current buffer. | |
1717 | ||
1718 | The value is a list of five elements: | |
1719 | (POS HPOS VPOS PREVHPOS CONTIN) | |
1720 | POS is the buffer position where the scan stopped. | |
1721 | VPOS is the vertical position where the scan stopped. | |
1722 | HPOS is the horizontal position where the scan stopped. | |
1723 | ||
1724 | PREVHPOS is the horizontal position one character back from POS. | |
1725 | CONTIN is t if a line was continued after (or within) the previous character. | |
1726 | ||
1727 | For example, to find the buffer position of column COL of line LINE | |
1728 | of a certain window, pass the window's starting location as FROM | |
1729 | and the window's upper-left coordinates as FROMPOS. | |
1730 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
1731 | visible section of the buffer, and pass LINE and COL as TOPOS. */) | |
5842a27b | 1732 | (Lisp_Object from, Lisp_Object frompos, Lisp_Object to, Lisp_Object topos, Lisp_Object width, Lisp_Object offsets, Lisp_Object window) |
42918ba5 | 1733 | { |
361f14bf | 1734 | struct window *w; |
8798a92b | 1735 | Lisp_Object bufpos, hpos, vpos, prevhpos; |
42918ba5 | 1736 | struct position *pos; |
d311d28c PE |
1737 | ptrdiff_t hscroll; |
1738 | int tab_offset; | |
42918ba5 | 1739 | |
b7826503 PJ |
1740 | CHECK_NUMBER_COERCE_MARKER (from); |
1741 | CHECK_CONS (frompos); | |
1742 | CHECK_NUMBER_CAR (frompos); | |
1743 | CHECK_NUMBER_CDR (frompos); | |
1744 | CHECK_NUMBER_COERCE_MARKER (to); | |
361f14bf KS |
1745 | if (!NILP (topos)) |
1746 | { | |
1747 | CHECK_CONS (topos); | |
1748 | CHECK_NUMBER_CAR (topos); | |
1749 | CHECK_NUMBER_CDR (topos); | |
1750 | } | |
1751 | if (!NILP (width)) | |
1752 | CHECK_NUMBER (width); | |
1753 | ||
42918ba5 RS |
1754 | if (!NILP (offsets)) |
1755 | { | |
b7826503 PJ |
1756 | CHECK_CONS (offsets); |
1757 | CHECK_NUMBER_CAR (offsets); | |
1758 | CHECK_NUMBER_CDR (offsets); | |
d311d28c PE |
1759 | if (! (0 <= XINT (XCAR (offsets)) && XINT (XCAR (offsets)) <= PTRDIFF_MAX |
1760 | && 0 <= XINT (XCDR (offsets)) && XINT (XCDR (offsets)) <= INT_MAX)) | |
1761 | args_out_of_range (XCAR (offsets), XCDR (offsets)); | |
70949dac KR |
1762 | hscroll = XINT (XCAR (offsets)); |
1763 | tab_offset = XINT (XCDR (offsets)); | |
42918ba5 RS |
1764 | } |
1765 | else | |
1766 | hscroll = tab_offset = 0; | |
1767 | ||
88af3af4 KH |
1768 | if (NILP (window)) |
1769 | window = Fselected_window (); | |
1770 | else | |
b7826503 | 1771 | CHECK_LIVE_WINDOW (window); |
361f14bf | 1772 | w = XWINDOW (window); |
88af3af4 | 1773 | |
9fdae274 KH |
1774 | if (XINT (from) < BEGV || XINT (from) > ZV) |
1775 | args_out_of_range_3 (from, make_number (BEGV), make_number (ZV)); | |
1776 | if (XINT (to) < BEGV || XINT (to) > ZV) | |
1777 | args_out_of_range_3 (to, make_number (BEGV), make_number (ZV)); | |
1778 | ||
70949dac KR |
1779 | pos = compute_motion (XINT (from), XINT (XCDR (frompos)), |
1780 | XINT (XCAR (frompos)), 0, | |
361f14bf KS |
1781 | XINT (to), |
1782 | (NILP (topos) | |
1783 | ? window_internal_height (w) | |
1784 | : XINT (XCDR (topos))), | |
1785 | (NILP (topos) | |
abde8f8c | 1786 | ? (window_body_cols (w) |
361f14bf KS |
1787 | - ( |
1788 | #ifdef HAVE_WINDOW_SYSTEM | |
d3d50620 | 1789 | FRAME_WINDOW_P (XFRAME (w->frame)) ? 0 : |
361f14bf KS |
1790 | #endif |
1791 | 1)) | |
1792 | : XINT (XCAR (topos))), | |
1793 | (NILP (width) ? -1 : XINT (width)), | |
1794 | hscroll, tab_offset, | |
88af3af4 | 1795 | XWINDOW (window)); |
42918ba5 | 1796 | |
94d92e9c | 1797 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
1798 | XSETINT (hpos, pos->hpos); |
1799 | XSETINT (vpos, pos->vpos); | |
1800 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
1801 | |
1802 | return Fcons (bufpos, | |
1803 | Fcons (hpos, | |
1804 | Fcons (vpos, | |
1805 | Fcons (prevhpos, | |
1806 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
1807 | ||
1808 | } | |
993b6404 | 1809 | \f |
0aa01123 | 1810 | /* Fvertical_motion and vmotion */ |
88c6e37e | 1811 | |
9306c32e | 1812 | static struct position val_vmotion; |
993b6404 JB |
1813 | |
1814 | struct position * | |
d311d28c | 1815 | vmotion (register ptrdiff_t from, register EMACS_INT vtarget, struct window *w) |
993b6404 | 1816 | { |
80b00b08 | 1817 | ptrdiff_t hscroll = w->hscroll; |
993b6404 JB |
1818 | struct position pos; |
1819 | /* vpos is cumulative vertical position, changed as from is changed */ | |
d311d28c PE |
1820 | register EMACS_INT vpos = 0; |
1821 | ptrdiff_t prevline; | |
1822 | register ptrdiff_t first; | |
1823 | ptrdiff_t from_byte; | |
1824 | ptrdiff_t lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
1825 | ptrdiff_t selective | |
4b4deea2 | 1826 | = (INTEGERP (BVAR (current_buffer, selective_display)) |
d311d28c PE |
1827 | ? clip_to_bounds (-1, XINT (BVAR (current_buffer, selective_display)), |
1828 | PTRDIFF_MAX) | |
4b4deea2 | 1829 | : !NILP (BVAR (current_buffer, selective_display)) ? -1 : 0); |
99ce22d5 | 1830 | Lisp_Object window; |
2ab90d49 | 1831 | int did_motion; |
7ac57cb3 RS |
1832 | /* This is the object we use for fetching character properties. */ |
1833 | Lisp_Object text_prop_object; | |
99ce22d5 KH |
1834 | |
1835 | XSETWINDOW (window, w); | |
1836 | ||
7ac57cb3 RS |
1837 | /* If the window contains this buffer, use it for getting text properties. |
1838 | Otherwise use the current buffer as arg for doing that. */ | |
d3d50620 | 1839 | if (EQ (w->buffer, Fcurrent_buffer ())) |
7ac57cb3 RS |
1840 | text_prop_object = window; |
1841 | else | |
1842 | text_prop_object = Fcurrent_buffer (); | |
1843 | ||
99ce22d5 | 1844 | if (vpos >= vtarget) |
993b6404 | 1845 | { |
99ce22d5 | 1846 | /* To move upward, go a line at a time until |
fe0066f5 | 1847 | we have gone at least far enough. */ |
99ce22d5 KH |
1848 | |
1849 | first = 1; | |
1850 | ||
1851 | while ((vpos > vtarget || first) && from > BEGV) | |
993b6404 | 1852 | { |
66c75ca5 RS |
1853 | Lisp_Object propval; |
1854 | ||
2965dff9 RS |
1855 | prevline = find_next_newline_no_quit (from - 1, -1); |
1856 | while (prevline > BEGV | |
5a05d3d2 | 1857 | && ((selective > 0 |
2965dff9 RS |
1858 | && indented_beyond_p (prevline, |
1859 | CHAR_TO_BYTE (prevline), | |
7831777b | 1860 | selective)) |
2965dff9 RS |
1861 | /* Watch out for newlines with `invisible' property. |
1862 | When moving upward, check the newline before. */ | |
1863 | || (propval = Fget_char_property (make_number (prevline - 1), | |
66c75ca5 | 1864 | Qinvisible, |
7ac57cb3 | 1865 | text_prop_object), |
339ee979 | 1866 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1867 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1868 | pos = *compute_motion (prevline, 0, | |
d311d28c | 1869 | lmargin, |
2ab90d49 | 1870 | 0, |
097812fb | 1871 | from, |
a997a7ca KH |
1872 | /* Don't care for VPOS... */ |
1873 | 1 << (BITS_PER_SHORT - 1), | |
1874 | /* ... nor HPOS. */ | |
1875 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1876 | -1, hscroll, |
d311d28c | 1877 | 0, |
2dd4e608 | 1878 | w); |
99ce22d5 KH |
1879 | vpos -= pos.vpos; |
1880 | first = 0; | |
2965dff9 | 1881 | from = prevline; |
993b6404 | 1882 | } |
99ce22d5 KH |
1883 | |
1884 | /* If we made exactly the desired vertical distance, | |
1885 | or if we hit beginning of buffer, | |
1886 | return point found */ | |
1887 | if (vpos >= vtarget) | |
993b6404 | 1888 | { |
99ce22d5 | 1889 | val_vmotion.bufpos = from; |
fe0066f5 | 1890 | val_vmotion.bytepos = CHAR_TO_BYTE (from); |
99ce22d5 KH |
1891 | val_vmotion.vpos = vpos; |
1892 | val_vmotion.hpos = lmargin; | |
1893 | val_vmotion.contin = 0; | |
1894 | val_vmotion.prevhpos = 0; | |
1895 | return &val_vmotion; | |
993b6404 | 1896 | } |
993b6404 | 1897 | |
99ce22d5 KH |
1898 | /* Otherwise find the correct spot by moving down */ |
1899 | } | |
1900 | /* Moving downward is simple, but must calculate from beg of line | |
1901 | to determine hpos of starting point */ | |
fe0066f5 RS |
1902 | from_byte = CHAR_TO_BYTE (from); |
1903 | if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n') | |
993b6404 | 1904 | { |
2ab90d49 | 1905 | Lisp_Object propval; |
66c75ca5 | 1906 | |
2965dff9 RS |
1907 | prevline = find_next_newline_no_quit (from, -1); |
1908 | while (prevline > BEGV | |
99ce22d5 | 1909 | && ((selective > 0 |
2965dff9 RS |
1910 | && indented_beyond_p (prevline, |
1911 | CHAR_TO_BYTE (prevline), | |
7831777b | 1912 | selective)) |
2965dff9 RS |
1913 | /* Watch out for newlines with `invisible' property. |
1914 | When moving downward, check the newline after. */ | |
1915 | || (propval = Fget_char_property (make_number (prevline), | |
1916 | Qinvisible, | |
7ac57cb3 | 1917 | text_prop_object), |
339ee979 | 1918 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1919 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1920 | pos = *compute_motion (prevline, 0, | |
d311d28c | 1921 | lmargin, |
2ab90d49 | 1922 | 0, |
097812fb | 1923 | from, |
a997a7ca KH |
1924 | /* Don't care for VPOS... */ |
1925 | 1 << (BITS_PER_SHORT - 1), | |
1926 | /* ... nor HPOS. */ | |
1927 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1928 | -1, hscroll, |
d311d28c | 1929 | 0, |
2dd4e608 | 1930 | w); |
2ab90d49 | 1931 | did_motion = 1; |
993b6404 | 1932 | } |
99ce22d5 | 1933 | else |
993b6404 | 1934 | { |
d311d28c | 1935 | pos.hpos = lmargin; |
99ce22d5 | 1936 | pos.vpos = 0; |
2ab90d49 | 1937 | did_motion = 0; |
993b6404 | 1938 | } |
2ab90d49 | 1939 | return compute_motion (from, vpos, pos.hpos, did_motion, |
a997a7ca | 1940 | ZV, vtarget, - (1 << (BITS_PER_SHORT - 1)), |
361f14bf | 1941 | -1, hscroll, |
d311d28c | 1942 | 0, |
2dd4e608 | 1943 | w); |
993b6404 JB |
1944 | } |
1945 | ||
a7ca3326 | 1946 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
8c1a1077 PJ |
1947 | doc: /* Move point to start of the screen line LINES lines down. |
1948 | If LINES is negative, this means moving up. | |
1949 | ||
1950 | This function is an ordinary cursor motion function | |
1951 | which calculates the new position based on how text would be displayed. | |
1952 | The new position may be the start of a line, | |
1953 | or just the start of a continuation line. | |
1954 | The function returns number of screen lines moved over; | |
1955 | that usually equals LINES, but may be closer to zero | |
1956 | if beginning or end of buffer was reached. | |
1957 | ||
1958 | The optional second argument WINDOW specifies the window to use for | |
1959 | parameters such as width, horizontal scrolling, and so on. | |
1960 | The default is to use the selected window's parameters. | |
1961 | ||
c876b227 SM |
1962 | LINES can optionally take the form (COLS . LINES), in which case |
1963 | the motion will not stop at the start of a screen line but on | |
1964 | its column COLS (if such exists on that line, that is). | |
1965 | ||
8c1a1077 PJ |
1966 | `vertical-motion' always uses the current buffer, |
1967 | regardless of which buffer is displayed in WINDOW. | |
1968 | This is consistent with other cursor motion functions | |
1969 | and makes it possible to use `vertical-motion' in any buffer, | |
1970 | whether or not it is currently displayed in some window. */) | |
5842a27b | 1971 | (Lisp_Object lines, Lisp_Object window) |
993b6404 | 1972 | { |
8720a429 GM |
1973 | struct it it; |
1974 | struct text_pos pt; | |
8720a429 | 1975 | struct window *w; |
39210e90 | 1976 | Lisp_Object old_buffer; |
f00bbb22 | 1977 | EMACS_INT old_charpos IF_LINT (= 0), old_bytepos IF_LINT (= 0); |
adc47434 | 1978 | struct gcpro gcpro1, gcpro2, gcpro3; |
baed8445 | 1979 | Lisp_Object lcols = Qnil; |
5671df8f | 1980 | double cols IF_LINT (= 0); |
57b3e30b | 1981 | void *itdata = NULL; |
c876b227 SM |
1982 | |
1983 | /* Allow LINES to be of the form (HPOS . VPOS) aka (COLUMNS . LINES). */ | |
1984 | if (CONSP (lines) && (NUMBERP (XCAR (lines)))) | |
1985 | { | |
baed8445 SM |
1986 | lcols = XCAR (lines); |
1987 | cols = INTEGERP (lcols) ? (double) XINT (lcols) : XFLOAT_DATA (lcols); | |
c876b227 SM |
1988 | lines = XCDR (lines); |
1989 | } | |
993b6404 | 1990 | |
b7826503 | 1991 | CHECK_NUMBER (lines); |
f1ecfe9b | 1992 | if (! NILP (window)) |
b7826503 | 1993 | CHECK_WINDOW (window); |
f1ecfe9b | 1994 | else |
92992c7e | 1995 | window = selected_window; |
8720a429 | 1996 | w = XWINDOW (window); |
39210e90 GM |
1997 | |
1998 | old_buffer = Qnil; | |
adc47434 | 1999 | GCPRO3 (old_buffer, old_charpos, old_bytepos); |
d3d50620 | 2000 | if (XBUFFER (w->buffer) != current_buffer) |
8720a429 | 2001 | { |
39210e90 | 2002 | /* Set the window's buffer temporarily to the current buffer. */ |
d3d50620 DA |
2003 | old_buffer = w->buffer; |
2004 | old_charpos = XMARKER (w->pointm)->charpos; | |
2005 | old_bytepos = XMARKER (w->pointm)->bytepos; | |
e8c17b81 | 2006 | wset_buffer (w, Fcurrent_buffer ()); |
d3d50620 | 2007 | set_marker_both (w->pointm, w->buffer, |
3a45383a | 2008 | BUF_PT (current_buffer), BUF_PT_BYTE (current_buffer)); |
8720a429 | 2009 | } |
097812fb | 2010 | |
6df71429 | 2011 | if (noninteractive) |
9305b0e7 | 2012 | { |
6df71429 RS |
2013 | struct position pos; |
2014 | pos = *vmotion (PT, XINT (lines), w); | |
2015 | SET_PT_BOTH (pos.bufpos, pos.bytepos); | |
9305b0e7 KS |
2016 | } |
2017 | else | |
6df71429 | 2018 | { |
5895d7b9 PE |
2019 | ptrdiff_t it_start, it_overshoot_count = 0; |
2020 | int first_x; | |
e3cbd34b | 2021 | int overshoot_handled = 0; |
3811fdf3 | 2022 | int disp_string_at_start_p = 0; |
24a06d04 | 2023 | |
57b3e30b | 2024 | itdata = bidi_shelve_cache (); |
6df71429 RS |
2025 | SET_TEXT_POS (pt, PT, PT_BYTE); |
2026 | start_display (&it, w, pt); | |
2f4ec7ce | 2027 | first_x = it.first_visible_x; |
24a06d04 | 2028 | it_start = IT_CHARPOS (it); |
14a7cabf | 2029 | |
48cdfb4b | 2030 | /* See comments below for why we calculate this. */ |
e3cbd34b EZ |
2031 | if (it.cmp_it.id >= 0) |
2032 | it_overshoot_count = 0; | |
2033 | else if (it.method == GET_FROM_STRING) | |
14a7cabf | 2034 | { |
e3cbd34b EZ |
2035 | const char *s = SSDATA (it.string); |
2036 | const char *e = s + SBYTES (it.string); | |
3811fdf3 EZ |
2037 | |
2038 | disp_string_at_start_p = it.string_from_display_prop_p; | |
e3cbd34b | 2039 | while (s < e) |
48cdfb4b | 2040 | { |
e3cbd34b EZ |
2041 | if (*s++ == '\n') |
2042 | it_overshoot_count++; | |
48cdfb4b | 2043 | } |
e3cbd34b | 2044 | if (!it_overshoot_count) |
1260aef1 | 2045 | it_overshoot_count = -1; |
14a7cabf | 2046 | } |
e3cbd34b EZ |
2047 | else |
2048 | it_overshoot_count = | |
2049 | !(it.method == GET_FROM_IMAGE || it.method == GET_FROM_STRETCH); | |
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 | |
e3cbd34b EZ |
2063 | /* IT may move too far if truncate-lines is on and PT lies |
2064 | beyond the right margin. IT may also move too far if the | |
2065 | starting point is on a Lisp string that has embedded | |
3811fdf3 EZ |
2066 | newlines, or spans several screen lines. In these cases, |
2067 | backtrack. */ | |
e3cbd34b EZ |
2068 | if (IT_CHARPOS (it) > it_start) |
2069 | { | |
2070 | /* We need to backtrack also if the Lisp string contains no | |
2071 | newlines, but there is a newline right after it. In this | |
2072 | case, IT overshoots if there is an after-string just | |
2073 | before the newline. */ | |
2074 | if (it_overshoot_count < 0 | |
2075 | && it.method == GET_FROM_BUFFER | |
2076 | && it.c == '\n') | |
2077 | it_overshoot_count = 1; | |
3811fdf3 EZ |
2078 | else if (disp_string_at_start_p && it.vpos > 0) |
2079 | { | |
2080 | /* This is the case of a display string that spans | |
2081 | several screen lines. In that case, we end up at the | |
2082 | end of the string, and it.vpos tells us how many | |
2083 | screen lines we need to backtrack. */ | |
2084 | it_overshoot_count = it.vpos; | |
2085 | } | |
e3cbd34b EZ |
2086 | if (it_overshoot_count > 0) |
2087 | move_it_by_lines (&it, -it_overshoot_count); | |
2088 | ||
2089 | overshoot_handled = 1; | |
2090 | } | |
48cdfb4b | 2091 | if (XINT (lines) <= 0) |
72ad106b | 2092 | { |
48cdfb4b CY |
2093 | it.vpos = 0; |
2094 | /* Do this even if LINES is 0, so that we move back to the | |
2095 | beginning of the current line as we ought. */ | |
2096 | if (XINT (lines) == 0 || IT_CHARPOS (it) > 0) | |
5895d7b9 | 2097 | move_it_by_lines (&it, max (PTRDIFF_MIN, XINT (lines))); |
48cdfb4b | 2098 | } |
e3cbd34b EZ |
2099 | else if (overshoot_handled) |
2100 | { | |
2101 | it.vpos = 0; | |
5895d7b9 | 2102 | move_it_by_lines (&it, min (PTRDIFF_MAX, XINT (lines))); |
48cdfb4b CY |
2103 | } |
2104 | else | |
2105 | { | |
e3cbd34b EZ |
2106 | /* Otherwise, we are at the first row occupied by PT, which |
2107 | might span multiple screen lines (e.g., if it's on a | |
2108 | multi-line display string). We want to start from the | |
2109 | last line that it occupies. */ | |
2110 | if (it_start < ZV) | |
48cdfb4b | 2111 | { |
e3cbd34b | 2112 | while (IT_CHARPOS (it) <= it_start) |
d8a7e7fc CY |
2113 | { |
2114 | it.vpos = 0; | |
e3cbd34b | 2115 | move_it_by_lines (&it, 1); |
d8a7e7fc | 2116 | } |
e3cbd34b | 2117 | if (XINT (lines) > 1) |
5895d7b9 | 2118 | move_it_by_lines (&it, min (PTRDIFF_MAX, XINT (lines) - 1)); |
e3cbd34b EZ |
2119 | } |
2120 | else | |
2121 | { | |
2122 | it.vpos = 0; | |
5895d7b9 | 2123 | move_it_by_lines (&it, min (PTRDIFF_MAX, XINT (lines))); |
48cdfb4b | 2124 | } |
72ad106b | 2125 | } |
097812fb | 2126 | |
2f4ec7ce | 2127 | /* Move to the goal column, if one was specified. */ |
baed8445 | 2128 | if (!NILP (lcols)) |
2f4ec7ce CY |
2129 | { |
2130 | /* If the window was originally hscrolled, move forward by | |
2131 | the hscrolled amount first. */ | |
2132 | if (first_x > 0) | |
2133 | { | |
2134 | move_it_in_display_line (&it, ZV, first_x, MOVE_TO_X); | |
2135 | it.current_x = 0; | |
2136 | } | |
2137 | move_it_in_display_line | |
2138 | (&it, ZV, | |
d3d50620 | 2139 | (int)(cols * FRAME_COLUMN_WIDTH (XFRAME (w->frame)) + 0.5), |
2f4ec7ce CY |
2140 | MOVE_TO_X); |
2141 | } | |
c876b227 | 2142 | |
6df71429 | 2143 | SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it)); |
35928349 | 2144 | bidi_unshelve_cache (itdata, 0); |
6df71429 | 2145 | } |
8720a429 | 2146 | |
39210e90 | 2147 | if (BUFFERP (old_buffer)) |
adc47434 | 2148 | { |
e8c17b81 | 2149 | wset_buffer (w, old_buffer); |
d3d50620 | 2150 | set_marker_both (w->pointm, w->buffer, |
3a45383a | 2151 | old_charpos, old_bytepos); |
adc47434 | 2152 | } |
097812fb | 2153 | |
39210e90 | 2154 | RETURN_UNGCPRO (make_number (it.vpos)); |
993b6404 | 2155 | } |
8720a429 GM |
2156 | |
2157 | ||
993b6404 | 2158 | \f |
88c6e37e | 2159 | /* File's initialization. */ |
0aa01123 | 2160 | |
dfcf069d | 2161 | void |
971de7fb | 2162 | syms_of_indent (void) |
993b6404 | 2163 | { |
29208e82 | 2164 | DEFVAR_BOOL ("indent-tabs-mode", indent_tabs_mode, |
fb7ada5f | 2165 | doc: /* Indentation can insert tabs if this is non-nil. */); |
993b6404 JB |
2166 | indent_tabs_mode = 1; |
2167 | ||
2168 | defsubr (&Scurrent_indentation); | |
2169 | defsubr (&Sindent_to); | |
2170 | defsubr (&Scurrent_column); | |
2171 | defsubr (&Smove_to_column); | |
2172 | defsubr (&Svertical_motion); | |
42918ba5 | 2173 | defsubr (&Scompute_motion); |
993b6404 | 2174 | } |