Commit | Line | Data |
---|---|---|
993b6404 | 1 | /* Indentation functions. |
e01732fa | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994, 1995, 1998, 2000, 2001, |
114f9c96 | 3 | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
8cabe764 | 4 | Free Software Foundation, Inc. |
993b6404 JB |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
993b6404 | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
993b6404 JB |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
993b6404 | 20 | |
18160b98 | 21 | #include <config.h> |
4d553a13 | 22 | #include <stdio.h> |
d7306fe6 | 23 | #include <setjmp.h> |
4d553a13 | 24 | |
993b6404 JB |
25 | #include "lisp.h" |
26 | #include "buffer.h" | |
f6ed712f | 27 | #include "character.h" |
fb911777 | 28 | #include "category.h" |
d6721dda | 29 | #include "composite.h" |
993b6404 | 30 | #include "indent.h" |
2538fae4 | 31 | #include "keyboard.h" |
502b9b64 | 32 | #include "frame.h" |
993b6404 JB |
33 | #include "window.h" |
34 | #include "termchar.h" | |
35 | #include "termopts.h" | |
36 | #include "disptab.h" | |
5a05d3d2 | 37 | #include "intervals.h" |
d6721dda | 38 | #include "dispextern.h" |
0aa01123 | 39 | #include "region-cache.h" |
993b6404 JB |
40 | |
41 | /* Indentation can insert tabs if this is non-zero; | |
88c6e37e GM |
42 | otherwise always uses spaces. */ |
43 | ||
c86f7377 | 44 | static int indent_tabs_mode; |
993b6404 | 45 | |
993b6404 JB |
46 | #define CR 015 |
47 | ||
79c2a4fc | 48 | /* These three values memorize the current column to avoid recalculation. */ |
88c6e37e GM |
49 | |
50 | /* Last value returned by current_column. | |
51 | Some things in set last_known_column_point to -1 | |
79c2a4fc | 52 | to mark the memorized value as invalid. */ |
88c6e37e | 53 | |
c86f7377 | 54 | static double last_known_column; |
88c6e37e GM |
55 | |
56 | /* Value of point when current_column was called. */ | |
57 | ||
83155776 | 58 | EMACS_INT last_known_column_point; |
88c6e37e GM |
59 | |
60 | /* Value of MODIFF when current_column was called. */ | |
61 | ||
c86f7377 | 62 | static int last_known_column_modified; |
993b6404 | 63 | |
f57e2426 J |
64 | static double current_column_1 (void); |
65 | static double position_indentation (int); | |
82d593eb | 66 | |
a997a7ca KH |
67 | /* Cache of beginning of line found by the last call of |
68 | current_column. */ | |
88c6e37e | 69 | |
83155776 | 70 | static EMACS_INT current_column_bol_cache; |
a997a7ca | 71 | |
993b6404 JB |
72 | /* Get the display table to use for the current buffer. */ |
73 | ||
d44f12b4 | 74 | struct Lisp_Char_Table * |
971de7fb | 75 | buffer_display_table (void) |
993b6404 JB |
76 | { |
77 | Lisp_Object thisbuf; | |
78 | ||
79 | thisbuf = current_buffer->display_table; | |
d44f12b4 RS |
80 | if (DISP_TABLE_P (thisbuf)) |
81 | return XCHAR_TABLE (thisbuf); | |
82 | if (DISP_TABLE_P (Vstandard_display_table)) | |
83 | return XCHAR_TABLE (Vstandard_display_table); | |
993b6404 JB |
84 | return 0; |
85 | } | |
86 | \f | |
0aa01123 JB |
87 | /* Width run cache considerations. */ |
88 | ||
89 | /* Return the width of character C under display table DP. */ | |
f845b8b2 | 90 | |
0aa01123 | 91 | static int |
971de7fb | 92 | character_width (int c, struct Lisp_Char_Table *dp) |
0aa01123 JB |
93 | { |
94 | Lisp_Object elt; | |
95 | ||
96 | /* These width computations were determined by examining the cases | |
97 | in display_text_line. */ | |
98 | ||
f845b8b2 | 99 | /* Everything can be handled by the display table, if it's |
0aa01123 | 100 | present and the element is right. */ |
f845b8b2 | 101 | if (dp && (elt = DISP_CHAR_VECTOR (dp, c), VECTORP (elt))) |
0aa01123 JB |
102 | return XVECTOR (elt)->size; |
103 | ||
f845b8b2 RS |
104 | /* Some characters are special. */ |
105 | if (c == '\n' || c == '\t' || c == '\015') | |
106 | return 0; | |
107 | ||
108 | /* Printing characters have width 1. */ | |
0aa01123 JB |
109 | else if (c >= 040 && c < 0177) |
110 | return 1; | |
111 | ||
112 | /* Everybody else (control characters, metacharacters) has other | |
113 | widths. We could return their actual widths here, but they | |
114 | depend on things like ctl_arrow and crud like that, and they're | |
115 | not very common at all. So we'll just claim we don't know their | |
116 | widths. */ | |
117 | else | |
118 | return 0; | |
119 | } | |
120 | ||
e0f24100 | 121 | /* Return true if the display table DISPTAB specifies the same widths |
0aa01123 JB |
122 | for characters as WIDTHTAB. We use this to decide when to |
123 | invalidate the buffer's width_run_cache. */ | |
88c6e37e | 124 | |
0aa01123 | 125 | int |
971de7fb | 126 | disptab_matches_widthtab (struct Lisp_Char_Table *disptab, struct Lisp_Vector *widthtab) |
0aa01123 JB |
127 | { |
128 | int i; | |
129 | ||
130 | if (widthtab->size != 256) | |
131 | abort (); | |
132 | ||
133 | for (i = 0; i < 256; i++) | |
134 | if (character_width (i, disptab) | |
135 | != XFASTINT (widthtab->contents[i])) | |
136 | return 0; | |
137 | ||
138 | return 1; | |
2ff4775b | 139 | } |
0aa01123 JB |
140 | |
141 | /* Recompute BUF's width table, using the display table DISPTAB. */ | |
88c6e37e | 142 | |
0aa01123 | 143 | void |
971de7fb | 144 | recompute_width_table (struct buffer *buf, struct Lisp_Char_Table *disptab) |
0aa01123 JB |
145 | { |
146 | int i; | |
228a2e1a | 147 | struct Lisp_Vector *widthtab; |
0aa01123 | 148 | |
228a2e1a KH |
149 | if (!VECTORP (buf->width_table)) |
150 | buf->width_table = Fmake_vector (make_number (256), make_number (0)); | |
151 | widthtab = XVECTOR (buf->width_table); | |
0aa01123 JB |
152 | if (widthtab->size != 256) |
153 | abort (); | |
154 | ||
155 | for (i = 0; i < 256; i++) | |
228a2e1a | 156 | XSETFASTINT (widthtab->contents[i], character_width (i, disptab)); |
0aa01123 JB |
157 | } |
158 | ||
159 | /* Allocate or free the width run cache, as requested by the current | |
160 | state of current_buffer's cache_long_line_scans variable. */ | |
88c6e37e | 161 | |
0aa01123 | 162 | static void |
971de7fb | 163 | width_run_cache_on_off (void) |
0aa01123 | 164 | { |
a997a7ca KH |
165 | if (NILP (current_buffer->cache_long_line_scans) |
166 | /* And, for the moment, this feature doesn't work on multibyte | |
167 | characters. */ | |
168 | || !NILP (current_buffer->enable_multibyte_characters)) | |
0aa01123 JB |
169 | { |
170 | /* It should be off. */ | |
171 | if (current_buffer->width_run_cache) | |
172 | { | |
173 | free_region_cache (current_buffer->width_run_cache); | |
174 | current_buffer->width_run_cache = 0; | |
175 | current_buffer->width_table = Qnil; | |
176 | } | |
177 | } | |
178 | else | |
179 | { | |
180 | /* It should be on. */ | |
181 | if (current_buffer->width_run_cache == 0) | |
2ff4775b | 182 | { |
0aa01123 | 183 | current_buffer->width_run_cache = new_region_cache (); |
0aa01123 JB |
184 | recompute_width_table (current_buffer, buffer_display_table ()); |
185 | } | |
186 | } | |
187 | } | |
188 | ||
189 | \f | |
9a21bb64 RS |
190 | /* Skip some invisible characters starting from POS. |
191 | This includes characters invisible because of text properties | |
192 | and characters invisible because of overlays. | |
193 | ||
194 | If position POS is followed by invisible characters, | |
195 | skip some of them and return the position after them. | |
196 | Otherwise return POS itself. | |
197 | ||
198 | Set *NEXT_BOUNDARY_P to the next position at which | |
199 | it will be necessary to call this function again. | |
200 | ||
201 | Don't scan past TO, and don't set *NEXT_BOUNDARY_P | |
202 | to a value greater than TO. | |
203 | ||
204 | If WINDOW is non-nil, and this buffer is displayed in WINDOW, | |
205 | take account of overlays that apply only in WINDOW. | |
206 | ||
207 | We don't necessarily skip all the invisible characters after POS | |
208 | because that could take a long time. We skip a reasonable number | |
209 | which can be skipped quickly. If there might be more invisible | |
210 | characters immediately following, then *NEXT_BOUNDARY_P | |
211 | will equal the return value. */ | |
212 | ||
83155776 | 213 | EMACS_INT |
971de7fb | 214 | skip_invisible (EMACS_INT pos, EMACS_INT *next_boundary_p, EMACS_INT to, Lisp_Object window) |
9a21bb64 | 215 | { |
2e34157c | 216 | Lisp_Object prop, position, overlay_limit, proplimit; |
2ca8b6c2 | 217 | Lisp_Object buffer, tmp; |
83155776 SM |
218 | EMACS_INT end; |
219 | int inv_p; | |
9a21bb64 RS |
220 | |
221 | XSETFASTINT (position, pos); | |
222 | XSETBUFFER (buffer, current_buffer); | |
223 | ||
224 | /* Give faster response for overlay lookup near POS. */ | |
225 | recenter_overlay_lists (current_buffer, pos); | |
226 | ||
227 | /* We must not advance farther than the next overlay change. | |
228 | The overlay change might change the invisible property; | |
229 | or there might be overlay strings to be displayed there. */ | |
230 | overlay_limit = Fnext_overlay_change (position); | |
231 | /* As for text properties, this gives a lower bound | |
232 | for where the invisible text property could change. */ | |
233 | proplimit = Fnext_property_change (position, buffer, Qt); | |
234 | if (XFASTINT (overlay_limit) < XFASTINT (proplimit)) | |
235 | proplimit = overlay_limit; | |
236 | /* PROPLIMIT is now a lower bound for the next change | |
237 | in invisible status. If that is plenty far away, | |
238 | use that lower bound. */ | |
239 | if (XFASTINT (proplimit) > pos + 100 || XFASTINT (proplimit) >= to) | |
240 | *next_boundary_p = XFASTINT (proplimit); | |
241 | /* Otherwise, scan for the next `invisible' property change. */ | |
242 | else | |
243 | { | |
244 | /* Don't scan terribly far. */ | |
245 | XSETFASTINT (proplimit, min (pos + 100, to)); | |
b55fa3c0 | 246 | /* No matter what, don't go past next overlay change. */ |
9a21bb64 RS |
247 | if (XFASTINT (overlay_limit) < XFASTINT (proplimit)) |
248 | proplimit = overlay_limit; | |
2ca8b6c2 SM |
249 | tmp = Fnext_single_property_change (position, Qinvisible, |
250 | buffer, proplimit); | |
251 | end = XFASTINT (tmp); | |
fe0066f5 | 252 | #if 0 |
a997a7ca KH |
253 | /* Don't put the boundary in the middle of multibyte form if |
254 | there is no actual property change. */ | |
255 | if (end == pos + 100 | |
256 | && !NILP (current_buffer->enable_multibyte_characters) | |
257 | && end < ZV) | |
258 | while (pos < end && !CHAR_HEAD_P (POS_ADDR (end))) | |
259 | end--; | |
fe0066f5 | 260 | #endif |
2e34157c | 261 | *next_boundary_p = end; |
9a21bb64 RS |
262 | } |
263 | /* if the `invisible' property is set, we can skip to | |
264 | the next property change */ | |
662152dd SM |
265 | prop = Fget_char_property (position, Qinvisible, |
266 | (!NILP (window) | |
267 | && EQ (XWINDOW (window)->buffer, buffer)) | |
268 | ? window : buffer); | |
269 | inv_p = TEXT_PROP_MEANS_INVISIBLE (prop); | |
270 | /* When counting columns (window == nil), don't skip over ellipsis text. */ | |
271 | if (NILP (window) ? inv_p == 1 : inv_p) | |
9a21bb64 RS |
272 | return *next_boundary_p; |
273 | return pos; | |
274 | } | |
275 | \f | |
c9c0f7cf KH |
276 | /* Set variables WIDTH and BYTES for a multibyte sequence starting at P. |
277 | ||
c9c0f7cf KH |
278 | DP is a display table or NULL. |
279 | ||
280 | This macro is used in current_column_1, Fmove_to_column, and | |
281 | compute_motion. */ | |
282 | ||
012fd715 KH |
283 | #define MULTIBYTE_BYTES_WIDTH(p, dp) \ |
284 | do { \ | |
285 | int c; \ | |
286 | \ | |
287 | wide_column = 0; \ | |
62a6e103 | 288 | c = STRING_CHAR_AND_LENGTH (p, bytes); \ |
012fd715 KH |
289 | if (BYTES_BY_CHAR_HEAD (*p) != bytes) \ |
290 | width = bytes * 4; \ | |
291 | else \ | |
292 | { \ | |
293 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) \ | |
294 | width = XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; \ | |
295 | else \ | |
f6ed712f | 296 | width = CHAR_WIDTH (c); \ |
012fd715 KH |
297 | if (width > 1) \ |
298 | wide_column = width; \ | |
299 | } \ | |
c9c0f7cf KH |
300 | } while (0) |
301 | ||
097812fb | 302 | |
993b6404 | 303 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, |
8c1a1077 PJ |
304 | doc: /* Return the horizontal position of point. Beginning of line is column 0. |
305 | This is calculated by adding together the widths of all the displayed | |
306 | representations of the character between the start of the previous line | |
7bf120f1 JB |
307 | and point (eg. control characters will have a width of 2 or 4, tabs |
308 | will have a variable width). | |
8c1a1077 PJ |
309 | Ignores finite width of frame, which means that this function may return |
310 | values greater than (frame-width). | |
311 | Whether the line is visible (if `selective-display' is t) has no effect; | |
e01732fa SM |
312 | however, ^M is treated as end of line when `selective-display' is t. |
313 | Text that has an invisible property is considered as having width 0, unless | |
314 | `buffer-invisibility-spec' specifies that it is replaced by an ellipsis. */) | |
5842a27b | 315 | (void) |
993b6404 JB |
316 | { |
317 | Lisp_Object temp; | |
097812fb | 318 | XSETFASTINT (temp, (int) current_column ()); /* iftc */ |
993b6404 JB |
319 | return temp; |
320 | } | |
321 | ||
e74928fc JB |
322 | /* Cancel any recorded value of the horizontal position. */ |
323 | ||
c9667ae1 | 324 | void |
971de7fb | 325 | invalidate_current_column (void) |
e74928fc JB |
326 | { |
327 | last_known_column_point = 0; | |
328 | } | |
329 | ||
76e20cb0 | 330 | double |
971de7fb | 331 | current_column (void) |
993b6404 JB |
332 | { |
333 | register int col; | |
334 | register unsigned char *ptr, *stop; | |
335 | register int tab_seen; | |
336 | int post_tab; | |
337 | register int c; | |
338 | register int tab_width = XINT (current_buffer->tab_width); | |
56a98455 | 339 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 340 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
993b6404 | 341 | |
6ec8bbd2 | 342 | if (PT == last_known_column_point |
993b6404 JB |
343 | && MODIFF == last_known_column_modified) |
344 | return last_known_column; | |
345 | ||
813b81b3 RS |
346 | /* If the buffer has overlays, text properties, |
347 | or multibyte characters, use a more general algorithm. */ | |
9a21bb64 | 348 | if (BUF_INTERVALS (current_buffer) |
3ea2f6f3 SM |
349 | || current_buffer->overlays_before |
350 | || current_buffer->overlays_after | |
813b81b3 RS |
351 | || Z != Z_BYTE) |
352 | return current_column_1 (); | |
9a21bb64 RS |
353 | |
354 | /* Scan backwards from point to the previous newline, | |
355 | counting width. Tab characters are the only complicated case. */ | |
356 | ||
993b6404 | 357 | /* Make a pointer for decrementing through the chars before point. */ |
fe0066f5 | 358 | ptr = BYTE_POS_ADDR (PT_BYTE - 1) + 1; |
993b6404 JB |
359 | /* Make a pointer to where consecutive chars leave off, |
360 | going backwards from point. */ | |
6ec8bbd2 | 361 | if (PT == BEGV) |
993b6404 | 362 | stop = ptr; |
6ec8bbd2 | 363 | else if (PT <= GPT || BEGV > GPT) |
993b6404 JB |
364 | stop = BEGV_ADDR; |
365 | else | |
366 | stop = GAP_END_ADDR; | |
367 | ||
88c6e37e GM |
368 | if (tab_width <= 0 || tab_width > 1000) |
369 | tab_width = 8; | |
993b6404 JB |
370 | |
371 | col = 0, tab_seen = 0, post_tab = 0; | |
372 | ||
373 | while (1) | |
374 | { | |
88c6e37e GM |
375 | EMACS_INT i, n; |
376 | Lisp_Object charvec; | |
097812fb | 377 | |
993b6404 JB |
378 | if (ptr == stop) |
379 | { | |
380 | /* We stopped either for the beginning of the buffer | |
381 | or for the gap. */ | |
382 | if (ptr == BEGV_ADDR) | |
383 | break; | |
097812fb | 384 | |
993b6404 JB |
385 | /* It was the gap. Jump back over it. */ |
386 | stop = BEGV_ADDR; | |
387 | ptr = GPT_ADDR; | |
097812fb | 388 | |
993b6404 | 389 | /* Check whether that brings us to beginning of buffer. */ |
88c6e37e GM |
390 | if (BEGV >= GPT) |
391 | break; | |
993b6404 JB |
392 | } |
393 | ||
394 | c = *--ptr; | |
097812fb | 395 | |
88c6e37e | 396 | if (dp && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
7050d530 | 397 | { |
88c6e37e GM |
398 | charvec = DISP_CHAR_VECTOR (dp, c); |
399 | n = ASIZE (charvec); | |
7050d530 | 400 | } |
88c6e37e | 401 | else |
993b6404 | 402 | { |
88c6e37e GM |
403 | charvec = Qnil; |
404 | n = 1; | |
405 | } | |
097812fb | 406 | |
88c6e37e GM |
407 | for (i = n - 1; i >= 0; --i) |
408 | { | |
409 | if (VECTORP (charvec)) | |
410 | { | |
411 | /* This should be handled the same as | |
412 | next_element_from_display_vector does it. */ | |
413 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 414 | |
f59836fe KS |
415 | if (GLYPH_CODE_P (entry) |
416 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
417 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
418 | else |
419 | c = ' '; | |
420 | } | |
097812fb | 421 | |
88c6e37e GM |
422 | if (c >= 040 && c < 0177) |
423 | col++; | |
424 | else if (c == '\n' | |
425 | || (c == '\r' | |
426 | && EQ (current_buffer->selective_display, Qt))) | |
427 | { | |
428 | ptr++; | |
429 | goto start_of_line_found; | |
430 | } | |
431 | else if (c == '\t') | |
432 | { | |
433 | if (tab_seen) | |
434 | col = ((col + tab_width) / tab_width) * tab_width; | |
097812fb | 435 | |
88c6e37e GM |
436 | post_tab += col; |
437 | col = 0; | |
438 | tab_seen = 1; | |
439 | } | |
f1004faf GM |
440 | else if (VECTORP (charvec)) |
441 | /* With a display table entry, C is displayed as is, and | |
442 | not displayed as \NNN or as ^N. If C is a single-byte | |
443 | character, it takes one column. If C is multi-byte in | |
444 | an unibyte buffer, it's translated to unibyte, so it | |
445 | also takes one column. */ | |
446 | ++col; | |
88c6e37e GM |
447 | else |
448 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
993b6404 | 449 | } |
993b6404 JB |
450 | } |
451 | ||
88c6e37e GM |
452 | start_of_line_found: |
453 | ||
993b6404 JB |
454 | if (tab_seen) |
455 | { | |
456 | col = ((col + tab_width) / tab_width) * tab_width; | |
457 | col += post_tab; | |
458 | } | |
459 | ||
a997a7ca KH |
460 | if (ptr == BEGV_ADDR) |
461 | current_column_bol_cache = BEGV; | |
462 | else | |
fe0066f5 RS |
463 | current_column_bol_cache = BYTE_TO_CHAR (PTR_BYTE_POS (ptr)); |
464 | ||
993b6404 | 465 | last_known_column = col; |
6ec8bbd2 | 466 | last_known_column_point = PT; |
993b6404 JB |
467 | last_known_column_modified = MODIFF; |
468 | ||
469 | return col; | |
470 | } | |
471 | \f | |
80e3db56 SM |
472 | extern Lisp_Object Qspace, QCwidth, QCalign_to; |
473 | ||
474 | /* Check the presence of a display property and compute its width. | |
475 | If a property was found and its width was found as well, return | |
476 | its width (>= 0) and set the position of the end of the property | |
477 | in ENDPOS. | |
478 | Otherwise just return -1. */ | |
479 | static int | |
480 | check_display_width (EMACS_INT pos, EMACS_INT col, EMACS_INT *endpos) | |
481 | { | |
482 | Lisp_Object val, overlay; | |
483 | ||
484 | if (CONSP (val = get_char_property_and_overlay | |
485 | (make_number (pos), Qdisplay, Qnil, &overlay)) | |
486 | && EQ (Qspace, XCAR (val))) | |
487 | { /* FIXME: Use calc_pixel_width_or_height, as in term.c. */ | |
488 | Lisp_Object plist = XCDR (val), prop; | |
489 | int width = -1; | |
490 | ||
491 | if ((prop = Fplist_get (plist, QCwidth), NATNUMP (prop))) | |
492 | width = XINT (prop); | |
493 | else if (FLOATP (prop)) | |
494 | width = (int)(XFLOAT_DATA (prop) + 0.5); | |
495 | else if ((prop = Fplist_get (plist, QCalign_to), NATNUMP (prop))) | |
496 | width = XINT (prop) - col; | |
497 | else if (FLOATP (prop)) | |
498 | width = (int)(XFLOAT_DATA (prop) + 0.5) - col; | |
409f2919 | 499 | |
80e3db56 SM |
500 | if (width >= 0) |
501 | { | |
502 | EMACS_INT start; | |
503 | if (OVERLAYP (overlay)) | |
504 | *endpos = OVERLAY_POSITION (OVERLAY_END (overlay)); | |
505 | else | |
506 | get_property_and_range (pos, Qdisplay, &val, &start, endpos, Qnil); | |
507 | return width; | |
508 | } | |
509 | } | |
510 | return -1; | |
511 | } | |
512 | ||
ef6f5c0e SM |
513 | /* Scanning from the beginning of the current line, stop at the buffer |
514 | position ENDPOS or at the column GOALCOL or at the end of line, whichever | |
515 | comes first. | |
516 | Return the resulting buffer position and column in ENDPOS and GOALCOL. | |
517 | PREVCOL gets set to the column of the previous position (it's always | |
518 | strictly smaller than the goal column). */ | |
519 | static void | |
520 | scan_for_column (EMACS_INT *endpos, EMACS_INT *goalcol, EMACS_INT *prevcol) | |
9a21bb64 | 521 | { |
83155776 | 522 | register EMACS_INT tab_width = XINT (current_buffer->tab_width); |
9a21bb64 RS |
523 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
524 | register struct Lisp_Char_Table *dp = buffer_display_table (); | |
fe0066f5 | 525 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
d6721dda | 526 | struct composition_it cmp_it; |
fc88345b KH |
527 | Lisp_Object window; |
528 | struct window *w; | |
9a21bb64 RS |
529 | |
530 | /* Start the scan at the beginning of this line with column number 0. */ | |
ef6f5c0e SM |
531 | register EMACS_INT col = 0, prev_col = 0; |
532 | EMACS_INT goal = goalcol ? *goalcol : MOST_POSITIVE_FIXNUM; | |
533 | EMACS_INT end = endpos ? *endpos : PT; | |
83155776 SM |
534 | EMACS_INT scan, scan_byte; |
535 | EMACS_INT next_boundary; | |
ef6f5c0e | 536 | { |
83155776 | 537 | EMACS_INT opoint = PT, opoint_byte = PT_BYTE; |
813b81b3 | 538 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); |
fe0066f5 RS |
539 | current_column_bol_cache = PT; |
540 | scan = PT, scan_byte = PT_BYTE; | |
541 | SET_PT_BOTH (opoint, opoint_byte); | |
542 | next_boundary = scan; | |
ef6f5c0e | 543 | } |
9a21bb64 | 544 | |
fc88345b KH |
545 | window = Fget_buffer_window (Fcurrent_buffer (), Qnil); |
546 | w = ! NILP (window) ? XWINDOW (window) : NULL; | |
547 | ||
9a21bb64 | 548 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
72af86bd | 549 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
550 | cmp_it.id = -1; |
551 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, Qnil); | |
9a21bb64 RS |
552 | |
553 | /* Scan forward to the target position. */ | |
ef6f5c0e | 554 | while (scan < end) |
9a21bb64 RS |
555 | { |
556 | int c; | |
557 | ||
558 | /* Occasionally we may need to skip invisible text. */ | |
559 | while (scan == next_boundary) | |
560 | { | |
ef6f5c0e | 561 | EMACS_INT old_scan = scan; |
9a21bb64 RS |
562 | /* This updates NEXT_BOUNDARY to the next place |
563 | where we might need to skip more invisible text. */ | |
ef6f5c0e | 564 | scan = skip_invisible (scan, &next_boundary, end, Qnil); |
fe0066f5 RS |
565 | if (scan != old_scan) |
566 | scan_byte = CHAR_TO_BYTE (scan); | |
ef6f5c0e SM |
567 | if (scan >= end) |
568 | goto endloop; | |
9a21bb64 RS |
569 | } |
570 | ||
ef6f5c0e SM |
571 | /* Test reaching the goal column. We do this after skipping |
572 | invisible characters, so that we put point before the | |
573 | character on which the cursor will appear. */ | |
574 | if (col >= goal) | |
575 | break; | |
576 | prev_col = col; | |
577 | ||
80e3db56 SM |
578 | { /* Check display property. */ |
579 | EMACS_INT end; | |
580 | int width = check_display_width (scan, col, &end); | |
581 | if (width >= 0) | |
582 | { | |
583 | col += width; | |
584 | if (end > scan) /* Avoid infinite loops with 0-width overlays. */ | |
585 | { | |
586 | scan = end; scan_byte = charpos_to_bytepos (scan); | |
587 | continue; | |
588 | } | |
589 | } | |
590 | } | |
591 | ||
d6721dda KH |
592 | /* Check composition sequence. */ |
593 | if (cmp_it.id >= 0 | |
594 | || (scan == cmp_it.stop_pos | |
595 | && composition_reseat_it (&cmp_it, scan, scan_byte, end, | |
fc88345b | 596 | w, NULL, Qnil))) |
d6721dda KH |
597 | composition_update_it (&cmp_it, scan, scan_byte, Qnil); |
598 | if (cmp_it.id >= 0) | |
599 | { | |
600 | scan += cmp_it.nchars; | |
601 | scan_byte += cmp_it.nbytes; | |
602 | if (scan <= end) | |
603 | col += cmp_it.width; | |
604 | if (cmp_it.to == cmp_it.nglyphs) | |
605 | { | |
606 | cmp_it.id = -1; | |
607 | composition_compute_stop_pos (&cmp_it, scan, scan_byte, end, | |
608 | Qnil); | |
609 | } | |
610 | else | |
611 | cmp_it.from = cmp_it.to; | |
612 | continue; | |
613 | } | |
614 | ||
813b81b3 | 615 | c = FETCH_BYTE (scan_byte); |
88c6e37e | 616 | |
ef6f5c0e SM |
617 | /* See if there is a display table and it relates |
618 | to this character. */ | |
619 | ||
c9c0f7cf | 620 | if (dp != 0 |
409f2919 | 621 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 622 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
9a21bb64 | 623 | { |
d6e483a4 RS |
624 | Lisp_Object charvec; |
625 | EMACS_INT i, n; | |
626 | ||
627 | /* This character is displayed using a vector of glyphs. | |
ef6f5c0e | 628 | Update the column/position based on those glyphs. */ |
d6e483a4 | 629 | |
88c6e37e GM |
630 | charvec = DISP_CHAR_VECTOR (dp, c); |
631 | n = ASIZE (charvec); | |
88c6e37e | 632 | |
d6e483a4 | 633 | for (i = 0; i < n; i++) |
88c6e37e GM |
634 | { |
635 | /* This should be handled the same as | |
636 | next_element_from_display_vector does it. */ | |
f59836fe | 637 | Lisp_Object entry = AREF (charvec, i); |
d6e483a4 | 638 | |
f59836fe KS |
639 | if (GLYPH_CODE_P (entry) |
640 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
641 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
642 | else |
643 | c = ' '; | |
d6e483a4 RS |
644 | |
645 | if (c == '\n') | |
646 | goto endloop; | |
647 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
648 | goto endloop; | |
649 | if (c == '\t') | |
650 | { | |
d6e483a4 RS |
651 | col += tab_width; |
652 | col = col / tab_width * tab_width; | |
653 | } | |
654 | else | |
655 | ++col; | |
88c6e37e | 656 | } |
d6e483a4 RS |
657 | } |
658 | else | |
659 | { | |
ef6f5c0e SM |
660 | /* The display table doesn't affect this character; |
661 | it displays as itself. */ | |
d6e483a4 | 662 | |
88c6e37e GM |
663 | if (c == '\n') |
664 | goto endloop; | |
665 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) | |
666 | goto endloop; | |
88c6e37e GM |
667 | if (c == '\t') |
668 | { | |
88c6e37e GM |
669 | col += tab_width; |
670 | col = col / tab_width * tab_width; | |
671 | } | |
409f2919 | 672 | else if (multibyte && LEADING_CODE_P (c)) |
88c6e37e | 673 | { |
ef6f5c0e | 674 | /* Start of multi-byte form. */ |
88c6e37e GM |
675 | unsigned char *ptr; |
676 | int bytes, width, wide_column; | |
097812fb | 677 | |
88c6e37e GM |
678 | ptr = BYTE_POS_ADDR (scan_byte); |
679 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
36974b5e RS |
680 | /* Subtract one to compensate for the increment |
681 | that is going to happen below. */ | |
ef6f5c0e | 682 | scan_byte += bytes - 1; |
88c6e37e GM |
683 | col += width; |
684 | } | |
685 | else if (ctl_arrow && (c < 040 || c == 0177)) | |
686 | col += 2; | |
687 | else if (c < 040 || c >= 0177) | |
688 | col += 4; | |
689 | else | |
690 | col++; | |
a997a7ca | 691 | } |
d6e483a4 RS |
692 | scan++; |
693 | scan_byte++; | |
694 | ||
9a21bb64 RS |
695 | } |
696 | endloop: | |
697 | ||
698 | last_known_column = col; | |
6ec8bbd2 | 699 | last_known_column_point = PT; |
9a21bb64 RS |
700 | last_known_column_modified = MODIFF; |
701 | ||
ef6f5c0e SM |
702 | if (goalcol) |
703 | *goalcol = col; | |
704 | if (endpos) | |
705 | *endpos = scan; | |
706 | if (prevcol) | |
707 | *prevcol = prev_col; | |
708 | } | |
709 | ||
710 | /* Return the column number of position POS | |
711 | by scanning forward from the beginning of the line. | |
712 | This function handles characters that are invisible | |
713 | due to text properties or overlays. */ | |
714 | ||
715 | static double | |
971de7fb | 716 | current_column_1 (void) |
ef6f5c0e SM |
717 | { |
718 | EMACS_INT col = MOST_POSITIVE_FIXNUM; | |
719 | EMACS_INT opoint = PT; | |
720 | ||
721 | scan_for_column (&opoint, &col, NULL); | |
9a21bb64 RS |
722 | return col; |
723 | } | |
724 | \f | |
f4a6687d GM |
725 | |
726 | #if 0 /* Not used. */ | |
727 | ||
c412c808 RS |
728 | /* Return the width in columns of the part of STRING from BEG to END. |
729 | If BEG is nil, that stands for the beginning of STRING. | |
730 | If END is nil, that stands for the end of STRING. */ | |
731 | ||
76e20cb0 | 732 | static double |
382ac0bd | 733 | string_display_width (string, beg, end) |
c412c808 RS |
734 | Lisp_Object string, beg, end; |
735 | { | |
736 | register int col; | |
737 | register unsigned char *ptr, *stop; | |
738 | register int tab_seen; | |
739 | int post_tab; | |
740 | register int c; | |
741 | register int tab_width = XINT (current_buffer->tab_width); | |
742 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); | |
d44f12b4 | 743 | register struct Lisp_Char_Table *dp = buffer_display_table (); |
c412c808 RS |
744 | int b, e; |
745 | ||
746 | if (NILP (end)) | |
d5db4077 | 747 | e = SCHARS (string); |
c412c808 RS |
748 | else |
749 | { | |
b7826503 | 750 | CHECK_NUMBER (end); |
c412c808 RS |
751 | e = XINT (end); |
752 | } | |
753 | ||
754 | if (NILP (beg)) | |
755 | b = 0; | |
756 | else | |
757 | { | |
b7826503 | 758 | CHECK_NUMBER (beg); |
c412c808 RS |
759 | b = XINT (beg); |
760 | } | |
761 | ||
762 | /* Make a pointer for decrementing through the chars before point. */ | |
d5db4077 | 763 | ptr = SDATA (string) + e; |
c412c808 RS |
764 | /* Make a pointer to where consecutive chars leave off, |
765 | going backwards from point. */ | |
d5db4077 | 766 | stop = SDATA (string) + b; |
c412c808 RS |
767 | |
768 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
769 | ||
770 | col = 0, tab_seen = 0, post_tab = 0; | |
771 | ||
772 | while (1) | |
773 | { | |
774 | if (ptr == stop) | |
775 | break; | |
776 | ||
777 | c = *--ptr; | |
778 | if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) | |
779 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; | |
780 | else if (c >= 040 && c < 0177) | |
781 | col++; | |
782 | else if (c == '\n') | |
783 | break; | |
784 | else if (c == '\t') | |
785 | { | |
786 | if (tab_seen) | |
787 | col = ((col + tab_width) / tab_width) * tab_width; | |
788 | ||
789 | post_tab += col; | |
790 | col = 0; | |
791 | tab_seen = 1; | |
792 | } | |
793 | else | |
794 | col += (ctl_arrow && c < 0200) ? 2 : 4; | |
795 | } | |
796 | ||
797 | if (tab_seen) | |
798 | { | |
799 | col = ((col + tab_width) / tab_width) * tab_width; | |
800 | col += post_tab; | |
801 | } | |
802 | ||
803 | return col; | |
804 | } | |
f4a6687d GM |
805 | |
806 | #endif /* 0 */ | |
807 | ||
c412c808 | 808 | \f |
993b6404 | 809 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
8c1a1077 | 810 | doc: /* Indent from point with tabs and spaces until COLUMN is reached. |
7bf120f1 | 811 | Optional second argument MINIMUM says always do at least MINIMUM spaces |
f64f035e EZ |
812 | even if that goes past COLUMN; by default, MINIMUM is zero. |
813 | ||
814 | The return value is COLUMN. */) | |
5842a27b | 815 | (Lisp_Object column, Lisp_Object minimum) |
993b6404 JB |
816 | { |
817 | int mincol; | |
818 | register int fromcol; | |
819 | register int tab_width = XINT (current_buffer->tab_width); | |
820 | ||
b7826503 | 821 | CHECK_NUMBER (column); |
56a98455 | 822 | if (NILP (minimum)) |
94d92e9c | 823 | XSETFASTINT (minimum, 0); |
b7826503 | 824 | CHECK_NUMBER (minimum); |
993b6404 JB |
825 | |
826 | fromcol = current_column (); | |
827 | mincol = fromcol + XINT (minimum); | |
04c98432 | 828 | if (mincol < XINT (column)) mincol = XINT (column); |
993b6404 JB |
829 | |
830 | if (fromcol == mincol) | |
831 | return make_number (mincol); | |
832 | ||
ccdcf1f5 | 833 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
993b6404 JB |
834 | |
835 | if (indent_tabs_mode) | |
836 | { | |
837 | Lisp_Object n; | |
94d92e9c | 838 | XSETFASTINT (n, mincol / tab_width - fromcol / tab_width); |
993b6404 JB |
839 | if (XFASTINT (n) != 0) |
840 | { | |
6d1bd1a5 | 841 | Finsert_char (make_number ('\t'), n, Qt); |
993b6404 JB |
842 | |
843 | fromcol = (mincol / tab_width) * tab_width; | |
844 | } | |
845 | } | |
846 | ||
04c98432 EN |
847 | XSETFASTINT (column, mincol - fromcol); |
848 | Finsert_char (make_number (' '), column, Qt); | |
993b6404 JB |
849 | |
850 | last_known_column = mincol; | |
6ec8bbd2 | 851 | last_known_column_point = PT; |
993b6404 JB |
852 | last_known_column_modified = MODIFF; |
853 | ||
04c98432 EN |
854 | XSETINT (column, mincol); |
855 | return column; | |
993b6404 | 856 | } |
0aa01123 | 857 | |
993b6404 | 858 | \f |
f57e2426 | 859 | static double position_indentation (int); |
dfcf069d | 860 | |
993b6404 | 861 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, |
8c1a1077 PJ |
862 | 0, 0, 0, |
863 | doc: /* Return the indentation of the current line. | |
864 | This is the horizontal position of the character | |
865 | following any initial whitespace. */) | |
5842a27b | 866 | (void) |
993b6404 JB |
867 | { |
868 | Lisp_Object val; | |
fe0066f5 RS |
869 | int opoint = PT, opoint_byte = PT_BYTE; |
870 | ||
871 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1); | |
993b6404 | 872 | |
097812fb | 873 | XSETFASTINT (val, (int) position_indentation (PT_BYTE)); /* iftc */ |
fe0066f5 | 874 | SET_PT_BOTH (opoint, opoint_byte); |
993b6404 JB |
875 | return val; |
876 | } | |
877 | ||
76e20cb0 | 878 | static double |
971de7fb | 879 | position_indentation (register int pos_byte) |
993b6404 | 880 | { |
83155776 SM |
881 | register EMACS_INT column = 0; |
882 | register EMACS_INT tab_width = XINT (current_buffer->tab_width); | |
993b6404 JB |
883 | register unsigned char *p; |
884 | register unsigned char *stop; | |
9a21bb64 | 885 | unsigned char *start; |
83155776 SM |
886 | EMACS_INT next_boundary_byte = pos_byte; |
887 | EMACS_INT ceiling = next_boundary_byte; | |
2ff4775b | 888 | |
ccdcf1f5 | 889 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
2ff4775b | 890 | |
fe0066f5 | 891 | p = BYTE_POS_ADDR (pos_byte); |
9a21bb64 RS |
892 | /* STOP records the value of P at which we will need |
893 | to think about the gap, or about invisible text, | |
894 | or about the end of the buffer. */ | |
895 | stop = p; | |
896 | /* START records the starting value of P. */ | |
897 | start = p; | |
993b6404 JB |
898 | while (1) |
899 | { | |
900 | while (p == stop) | |
901 | { | |
83155776 | 902 | EMACS_INT stop_pos_byte; |
9a21bb64 | 903 | |
fe0066f5 RS |
904 | /* If we have updated P, set POS_BYTE to match. |
905 | The first time we enter the loop, POS_BYTE is already right. */ | |
9a21bb64 | 906 | if (p != start) |
fe0066f5 | 907 | pos_byte = PTR_BYTE_POS (p); |
9a21bb64 | 908 | /* Consider the various reasons STOP might have been set here. */ |
fe0066f5 | 909 | if (pos_byte == ZV_BYTE) |
993b6404 | 910 | return column; |
fe0066f5 RS |
911 | if (pos_byte == next_boundary_byte) |
912 | { | |
83155776 SM |
913 | EMACS_INT next_boundary; |
914 | EMACS_INT pos = BYTE_TO_CHAR (pos_byte); | |
fe0066f5 RS |
915 | pos = skip_invisible (pos, &next_boundary, ZV, Qnil); |
916 | pos_byte = CHAR_TO_BYTE (pos); | |
917 | next_boundary_byte = CHAR_TO_BYTE (next_boundary); | |
918 | } | |
919 | if (pos_byte >= ceiling) | |
920 | ceiling = BUFFER_CEILING_OF (pos_byte) + 1; | |
9a21bb64 RS |
921 | /* Compute the next place we need to stop and think, |
922 | and set STOP accordingly. */ | |
fe0066f5 | 923 | stop_pos_byte = min (ceiling, next_boundary_byte); |
9a21bb64 | 924 | /* The -1 and +1 arrange to point at the first byte of gap |
fe0066f5 | 925 | (if STOP_POS_BYTE is the position of the gap) |
9a21bb64 | 926 | rather than at the data after the gap. */ |
097812fb | 927 | |
fe0066f5 RS |
928 | stop = BYTE_POS_ADDR (stop_pos_byte - 1) + 1; |
929 | p = BYTE_POS_ADDR (pos_byte); | |
993b6404 JB |
930 | } |
931 | switch (*p++) | |
932 | { | |
fb911777 KH |
933 | case 0240: |
934 | if (! NILP (current_buffer->enable_multibyte_characters)) | |
935 | return column; | |
993b6404 JB |
936 | case ' ': |
937 | column++; | |
938 | break; | |
939 | case '\t': | |
940 | column += tab_width - column % tab_width; | |
941 | break; | |
942 | default: | |
fb911777 KH |
943 | if (ASCII_BYTE_P (p[-1]) |
944 | || NILP (current_buffer->enable_multibyte_characters)) | |
945 | return column; | |
946 | { | |
fe0066f5 RS |
947 | int c; |
948 | pos_byte = PTR_BYTE_POS (p - 1); | |
949 | c = FETCH_MULTIBYTE_CHAR (pos_byte); | |
fb911777 KH |
950 | if (CHAR_HAS_CATEGORY (c, ' ')) |
951 | { | |
952 | column++; | |
fe0066f5 RS |
953 | INC_POS (pos_byte); |
954 | p = BYTE_POS_ADDR (pos_byte); | |
fb911777 KH |
955 | } |
956 | else | |
957 | return column; | |
958 | } | |
993b6404 JB |
959 | } |
960 | } | |
961 | } | |
1b15e576 KH |
962 | |
963 | /* Test whether the line beginning at POS is indented beyond COLUMN. | |
964 | Blank lines are treated as if they had the same indentation as the | |
965 | preceding line. */ | |
fe0066f5 | 966 | |
1b15e576 | 967 | int |
971de7fb | 968 | indented_beyond_p (int pos, int pos_byte, double column) |
1b15e576 | 969 | { |
76e20cb0 | 970 | double val; |
fe0066f5 RS |
971 | int opoint = PT, opoint_byte = PT_BYTE; |
972 | ||
973 | SET_PT_BOTH (pos, pos_byte); | |
974 | while (PT > BEGV && FETCH_BYTE (PT_BYTE) == '\n') | |
975 | scan_newline (PT - 1, PT_BYTE - 1, BEGV, BEGV_BYTE, -1, 0); | |
976 | ||
d5d6f706 | 977 | val = position_indentation (PT_BYTE); |
fe0066f5 | 978 | SET_PT_BOTH (opoint, opoint_byte); |
097812fb | 979 | return val >= column; /* hmm, float comparison */ |
1b15e576 | 980 | } |
993b6404 | 981 | \f |
782d260e | 982 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, "p", |
8c1a1077 | 983 | doc: /* Move point to column COLUMN in the current line. |
3c860543 | 984 | Interactively, COLUMN is the value of prefix numeric argument. |
8c1a1077 PJ |
985 | The column of a character is calculated by adding together the widths |
986 | as displayed of the previous characters in the line. | |
987 | This function ignores line-continuation; | |
988 | there is no upper limit on the column number a character can have | |
989 | and horizontal scrolling has no effect. | |
990 | ||
991 | If specified column is within a character, point goes after that character. | |
992 | If it's past end of line, point goes to end of line. | |
993 | ||
3c860543 EZ |
994 | Optional second argument FORCE non-nil means if COLUMN is in the |
995 | middle of a tab character, change it to spaces. | |
996 | In addition, if FORCE is t, and the line is too short to reach | |
997 | COLUMN, add spaces/tabs to get there. | |
8c1a1077 PJ |
998 | |
999 | The return value is the current column. */) | |
5842a27b | 1000 | (Lisp_Object column, Lisp_Object force) |
993b6404 | 1001 | { |
ef6f5c0e SM |
1002 | EMACS_INT pos; |
1003 | EMACS_INT col, prev_col; | |
1004 | EMACS_INT goal; | |
fe0066f5 | 1005 | |
b7826503 | 1006 | CHECK_NATNUM (column); |
993b6404 JB |
1007 | goal = XINT (column); |
1008 | ||
ef6f5c0e SM |
1009 | col = goal; |
1010 | pos = ZV; | |
1011 | scan_for_column (&pos, &col, &prev_col); | |
993b6404 | 1012 | |
ef6f5c0e | 1013 | SET_PT (pos); |
4c669c09 | 1014 | |
ef6f5c0e SM |
1015 | /* If a tab char made us overshoot, change it to spaces |
1016 | and scan through it again. */ | |
1017 | if (!NILP (force) && col > goal) | |
993b6404 | 1018 | { |
4c92f429 | 1019 | int c; |
ef6f5c0e | 1020 | EMACS_INT pos_byte = PT_BYTE; |
d6e483a4 | 1021 | |
4c92f429 AS |
1022 | DEC_POS (pos_byte); |
1023 | c = FETCH_CHAR (pos_byte); | |
ef6f5c0e | 1024 | if (c == '\t' && prev_col < goal) |
d6e483a4 | 1025 | { |
ef6f5c0e SM |
1026 | EMACS_INT goal_pt, goal_pt_byte; |
1027 | ||
1028 | /* Insert spaces in front of the tab to reach GOAL. Do this | |
1029 | first so that a marker at the end of the tab gets | |
1030 | adjusted. */ | |
1031 | SET_PT_BOTH (PT - 1, PT_BYTE - 1); | |
1032 | Finsert_char (make_number (' '), make_number (goal - prev_col), Qt); | |
1033 | ||
1034 | /* Now delete the tab, and indent to COL. */ | |
1035 | del_range (PT, PT + 1); | |
1036 | goal_pt = PT; | |
1037 | goal_pt_byte = PT_BYTE; | |
1038 | Findent_to (make_number (col), Qnil); | |
1039 | SET_PT_BOTH (goal_pt, goal_pt_byte); | |
1040 | ||
1041 | /* Set the last_known... vars consistently. */ | |
1042 | col = goal; | |
a997a7ca | 1043 | } |
993b6404 JB |
1044 | } |
1045 | ||
1046 | /* If line ends prematurely, add space to the end. */ | |
de4075cf | 1047 | if (col < goal && EQ (force, Qt)) |
230a4cbd | 1048 | Findent_to (make_number (col = goal), Qnil); |
993b6404 JB |
1049 | |
1050 | last_known_column = col; | |
6ec8bbd2 | 1051 | last_known_column_point = PT; |
993b6404 JB |
1052 | last_known_column_modified = MODIFF; |
1053 | ||
ef6f5c0e | 1054 | return make_number (col); |
993b6404 JB |
1055 | } |
1056 | \f | |
0aa01123 JB |
1057 | /* compute_motion: compute buffer posn given screen posn and vice versa */ |
1058 | ||
993b6404 JB |
1059 | struct position val_compute_motion; |
1060 | ||
1061 | /* Scan the current buffer forward from offset FROM, pretending that | |
1062 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer | |
1063 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), | |
0aa01123 JB |
1064 | and return the ending buffer position and screen location. If we |
1065 | can't hit the requested column exactly (because of a tab or other | |
1066 | multi-column character), overshoot. | |
993b6404 | 1067 | |
2ab90d49 KH |
1068 | DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings |
1069 | at FROM. This is the case if FROMVPOS and FROMVPOS came from an | |
1070 | earlier call to compute_motion. The other common case is that FROMHPOS | |
1071 | is zero and FROM is a position that "belongs" at column zero, but might | |
1072 | be shifted by overlay strings; in this case DID_MOTION should be 0. | |
1073 | ||
993b6404 JB |
1074 | WIDTH is the number of columns available to display text; |
1075 | compute_motion uses this to handle continuation lines and such. | |
361f14bf KS |
1076 | If WIDTH is -1, use width of window's text area adjusted for |
1077 | continuation glyph when needed. | |
1078 | ||
993b6404 JB |
1079 | HSCROLL is the number of columns not being displayed at the left |
1080 | margin; this is usually taken from a window's hscroll member. | |
a9764248 JB |
1081 | TAB_OFFSET is the number of columns of the first tab that aren't |
1082 | being displayed, perhaps because of a continuation line or | |
1083 | something. | |
993b6404 JB |
1084 | |
1085 | compute_motion returns a pointer to a struct position. The bufpos | |
1086 | member gives the buffer position at the end of the scan, and hpos | |
0aa01123 JB |
1087 | and vpos give its cartesian location. prevhpos is the column at |
1088 | which the character before bufpos started, and contin is non-zero | |
1089 | if we reached the current line by continuing the previous. | |
1090 | ||
1091 | Note that FROMHPOS and TOHPOS should be expressed in real screen | |
1092 | columns, taking HSCROLL and the truncation glyph at the left margin | |
1093 | into account. That is, beginning-of-line moves you to the hpos | |
1094 | -HSCROLL + (HSCROLL > 0). | |
993b6404 JB |
1095 | |
1096 | For example, to find the buffer position of column COL of line LINE | |
1097 | of a certain window, pass the window's starting location as FROM | |
1098 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. | |
1099 | Pass the buffer's ZV as TO, to limit the scan to the end of the | |
1100 | visible section of the buffer, and pass LINE and COL as TOVPOS and | |
2ff4775b | 1101 | TOHPOS. |
993b6404 JB |
1102 | |
1103 | When displaying in window w, a typical formula for WIDTH is: | |
1104 | ||
1105 | window_width - 1 | |
a3c87d4e | 1106 | - (has_vertical_scroll_bars |
90022f5a KS |
1107 | ? WINDOW_CONFIG_SCROLL_BAR_COLS (window) |
1108 | : (window_width + window_left != frame_cols)) | |
993b6404 JB |
1109 | |
1110 | where | |
90022f5a KS |
1111 | window_width is XFASTINT (w->total_cols), |
1112 | window_left is XFASTINT (w->left_col), | |
a3c87d4e | 1113 | has_vertical_scroll_bars is |
90022f5a KS |
1114 | WINDOW_HAS_VERTICAL_SCROLL_BAR (window) |
1115 | and frame_cols = FRAME_COLS (XFRAME (window->frame)) | |
993b6404 | 1116 | |
90022f5a KS |
1117 | Or you can let window_box_text_cols do this all for you, and write: |
1118 | window_box_text_cols (w) - 1 | |
fa61c701 JB |
1119 | |
1120 | The `-1' accounts for the continuation-line backslashes; the rest | |
7e7a76b5 | 1121 | accounts for window borders if the window is split horizontally, and |
1827d036 | 1122 | the scroll bars if they are turned on. */ |
993b6404 JB |
1123 | |
1124 | struct position * | |
971de7fb | 1125 | 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 | 1126 | { |
83155776 SM |
1127 | register EMACS_INT hpos = fromhpos; |
1128 | register EMACS_INT vpos = fromvpos; | |
cde9337b | 1129 | |
83155776 SM |
1130 | register EMACS_INT pos; |
1131 | EMACS_INT pos_byte; | |
6bbd7a29 | 1132 | register int c = 0; |
83155776 | 1133 | register EMACS_INT tab_width = XFASTINT (current_buffer->tab_width); |
56a98455 | 1134 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
d44f12b4 | 1135 | register struct Lisp_Char_Table *dp = window_display_table (win); |
993b6404 | 1136 | int selective |
eeaafd4f | 1137 | = (INTEGERP (current_buffer->selective_display) |
69eaf10d RS |
1138 | ? XINT (current_buffer->selective_display) |
1139 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
993b6404 | 1140 | int selective_rlen |
eeaafd4f | 1141 | = (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp)) |
dea4d2e6 | 1142 | ? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0); |
2ab90d49 KH |
1143 | /* The next location where the `invisible' property changes, or an |
1144 | overlay starts or ends. */ | |
83155776 | 1145 | EMACS_INT next_boundary = from; |
993b6404 | 1146 | |
0aa01123 JB |
1147 | /* For computing runs of characters with similar widths. |
1148 | Invariant: width_run_width is zero, or all the characters | |
2ff4775b | 1149 | from width_run_start to width_run_end have a fixed width of |
0aa01123 | 1150 | width_run_width. */ |
83155776 SM |
1151 | EMACS_INT width_run_start = from; |
1152 | EMACS_INT width_run_end = from; | |
1153 | EMACS_INT width_run_width = 0; | |
0aa01123 | 1154 | Lisp_Object *width_table; |
66c75ca5 | 1155 | Lisp_Object buffer; |
0aa01123 JB |
1156 | |
1157 | /* The next buffer pos where we should consult the width run cache. */ | |
83155776 | 1158 | EMACS_INT next_width_run = from; |
0e435804 | 1159 | Lisp_Object window; |
0aa01123 | 1160 | |
a997a7ca | 1161 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
c71c19f4 RS |
1162 | /* If previous char scanned was a wide character, |
1163 | this is the column where it ended. Otherwise, this is 0. */ | |
83155776 SM |
1164 | EMACS_INT wide_column_end_hpos = 0; |
1165 | EMACS_INT prev_pos; /* Previous buffer position. */ | |
1166 | EMACS_INT prev_pos_byte; /* Previous buffer position. */ | |
1167 | EMACS_INT prev_hpos = 0; | |
1168 | EMACS_INT prev_vpos = 0; | |
1169 | EMACS_INT contin_hpos; /* HPOS of last column of continued line. */ | |
1170 | EMACS_INT prev_tab_offset; /* Previous tab offset. */ | |
1171 | EMACS_INT continuation_glyph_width; | |
a997a7ca | 1172 | |
d6721dda KH |
1173 | struct composition_it cmp_it; |
1174 | ||
66c75ca5 | 1175 | XSETBUFFER (buffer, current_buffer); |
0e435804 | 1176 | XSETWINDOW (window, win); |
66c75ca5 | 1177 | |
0aa01123 JB |
1178 | width_run_cache_on_off (); |
1179 | if (dp == buffer_display_table ()) | |
1180 | width_table = (VECTORP (current_buffer->width_table) | |
1181 | ? XVECTOR (current_buffer->width_table)->contents | |
1182 | : 0); | |
1183 | else | |
1184 | /* If the window has its own display table, we can't use the width | |
1185 | run cache, because that's based on the buffer's display table. */ | |
1186 | width_table = 0; | |
1187 | ||
e4500116 GM |
1188 | if (tab_width <= 0 || tab_width > 1000) |
1189 | tab_width = 8; | |
1190 | ||
361f14bf KS |
1191 | /* Negative width means use all available text columns. */ |
1192 | if (width < 0) | |
1193 | { | |
1194 | width = window_box_text_cols (win); | |
1195 | /* We must make room for continuation marks if we don't have fringes. */ | |
1196 | #ifdef HAVE_WINDOW_SYSTEM | |
1197 | if (!FRAME_WINDOW_P (XFRAME (win->frame))) | |
1198 | #endif | |
1199 | width -= 1; | |
1200 | } | |
1201 | ||
8cc08515 | 1202 | continuation_glyph_width = 1; |
ed5c373c | 1203 | #ifdef HAVE_WINDOW_SYSTEM |
8cc08515 KS |
1204 | if (FRAME_WINDOW_P (XFRAME (win->frame))) |
1205 | continuation_glyph_width = 0; /* In the fringe. */ | |
ed5c373c KS |
1206 | #endif |
1207 | ||
e4500116 GM |
1208 | immediate_quit = 1; |
1209 | QUIT; | |
cde9337b | 1210 | |
a997a7ca | 1211 | pos = prev_pos = from; |
fe0066f5 | 1212 | pos_byte = prev_pos_byte = CHAR_TO_BYTE (from); |
a997a7ca KH |
1213 | contin_hpos = 0; |
1214 | prev_tab_offset = tab_offset; | |
72af86bd | 1215 | memset (&cmp_it, 0, sizeof cmp_it); |
d6721dda KH |
1216 | cmp_it.id = -1; |
1217 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, Qnil); | |
1218 | ||
2ab90d49 KH |
1219 | while (1) |
1220 | { | |
1221 | while (pos == next_boundary) | |
f75c0f8a | 1222 | { |
83155776 SM |
1223 | EMACS_INT pos_here = pos; |
1224 | EMACS_INT newpos; | |
98136db3 | 1225 | |
f9ba10b0 | 1226 | /* Don't skip invisible if we are already at the margin. */ |
8a00d895 | 1227 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
f9ba10b0 RS |
1228 | { |
1229 | if (contin_hpos && prev_hpos == 0 | |
1230 | && hpos > tohpos | |
1231 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
1232 | { /* Line breaks because we can't put the character at the | |
1233 | previous line any more. It is not the multi-column | |
1234 | character continued in middle. Go back to previous | |
1235 | buffer position, screen position, and set tab offset | |
1236 | to previous value. It's the beginning of the | |
1237 | line. */ | |
1238 | pos = prev_pos; | |
1239 | pos_byte = prev_pos_byte; | |
1240 | hpos = prev_hpos; | |
6b61353c | 1241 | vpos = prev_vpos; |
f9ba10b0 RS |
1242 | tab_offset = prev_tab_offset; |
1243 | } | |
1244 | break; | |
1245 | } | |
1246 | ||
2ab90d49 KH |
1247 | /* If the caller says that the screen position came from an earlier |
1248 | call to compute_motion, then we've already accounted for the | |
1249 | overlay strings at point. This is only true the first time | |
1250 | through, so clear the flag after testing it. */ | |
1251 | if (!did_motion) | |
1252 | /* We need to skip past the overlay strings. Currently those | |
a997a7ca | 1253 | strings must not contain TAB; |
2ab90d49 KH |
1254 | if we want to relax that restriction, something will have |
1255 | to be changed here. */ | |
a997a7ca KH |
1256 | { |
1257 | unsigned char *ovstr; | |
1258 | int ovlen = overlay_strings (pos, win, &ovstr); | |
4116deee KH |
1259 | hpos += ((multibyte && ovlen > 0) |
1260 | ? strwidth (ovstr, ovlen) : ovlen); | |
a997a7ca | 1261 | } |
2ab90d49 KH |
1262 | did_motion = 0; |
1263 | ||
1264 | if (pos >= to) | |
1265 | break; | |
66c75ca5 | 1266 | |
9a21bb64 RS |
1267 | /* Advance POS past invisible characters |
1268 | (but not necessarily all that there are here), | |
1269 | and store in next_boundary the next position where | |
1270 | we need to call skip_invisible. */ | |
98136db3 RS |
1271 | newpos = skip_invisible (pos, &next_boundary, to, window); |
1272 | ||
1273 | if (newpos >= to) | |
e8cb089b RS |
1274 | { |
1275 | pos = min (to, newpos); | |
bcfbd63d | 1276 | pos_byte = CHAR_TO_BYTE (pos); |
e8cb089b RS |
1277 | goto after_loop; |
1278 | } | |
98136db3 | 1279 | |
fe0066f5 RS |
1280 | if (newpos != pos_here) |
1281 | { | |
1282 | pos = newpos; | |
1283 | pos_byte = CHAR_TO_BYTE (pos); | |
1284 | } | |
f75c0f8a | 1285 | } |
2ab90d49 KH |
1286 | |
1287 | /* Handle right margin. */ | |
a997a7ca KH |
1288 | /* Note on a wide-column character. |
1289 | ||
1290 | Characters are classified into the following three categories | |
1291 | according to the width (columns occupied on screen). | |
1292 | ||
1293 | (1) single-column character: ex. `a' | |
1294 | (2) multi-column character: ex. `^A', TAB, `\033' | |
1295 | (3) wide-column character: ex. Japanese character, Chinese character | |
1296 | (In the following example, `W_' stands for them.) | |
1297 | ||
1298 | Multi-column characters can be divided around the right margin, | |
1299 | but wide-column characters cannot. | |
1300 | ||
1301 | NOTE: | |
1302 | ||
1303 | (*) The cursor is placed on the next character after the point. | |
1304 | ||
1305 | ---------- | |
1306 | abcdefghi\ | |
1307 | j ^---- next after the point | |
1308 | ^--- next char. after the point. | |
1309 | ---------- | |
1310 | In case of sigle-column character | |
1311 | ||
1312 | ---------- | |
1313 | abcdefgh\\ | |
1314 | 033 ^---- next after the point, next char. after the point. | |
1315 | ---------- | |
1316 | In case of multi-column character | |
1317 | ||
1318 | ---------- | |
1319 | abcdefgh\\ | |
1320 | W_ ^---- next after the point | |
1321 | ^---- next char. after the point. | |
1322 | ---------- | |
097812fb | 1323 | In case of wide-column character |
a997a7ca KH |
1324 | |
1325 | The problem here is continuation at a wide-column character. | |
1326 | In this case, the line may shorter less than WIDTH. | |
1327 | And we find the continuation AFTER it occurs. | |
1328 | ||
1329 | */ | |
1330 | ||
1331 | if (hpos > width) | |
2ab90d49 | 1332 | { |
81b6a665 CY |
1333 | int total_width = width + continuation_glyph_width; |
1334 | int truncate = 0; | |
1335 | ||
1336 | if (!NILP (Vtruncate_partial_width_windows) | |
1337 | && (total_width < FRAME_COLS (XFRAME (WINDOW_FRAME (win))))) | |
1338 | { | |
1339 | if (INTEGERP (Vtruncate_partial_width_windows)) | |
1340 | truncate | |
1341 | = total_width < XFASTINT (Vtruncate_partial_width_windows); | |
1342 | else | |
1343 | truncate = 1; | |
1344 | } | |
1345 | ||
1346 | if (hscroll || truncate | |
2ab90d49 KH |
1347 | || !NILP (current_buffer->truncate_lines)) |
1348 | { | |
529724fe AS |
1349 | /* Truncating: skip to newline, unless we are already past |
1350 | TO (we need to go back below). */ | |
1351 | if (pos <= to) | |
fe0066f5 RS |
1352 | { |
1353 | pos = find_before_next_newline (pos, to, 1); | |
1354 | pos_byte = CHAR_TO_BYTE (pos); | |
529724fe AS |
1355 | hpos = width; |
1356 | /* If we just skipped next_boundary, | |
1357 | loop around in the main while | |
1358 | and handle it. */ | |
1359 | if (pos >= next_boundary) | |
1360 | next_boundary = pos + 1; | |
1361 | prev_hpos = width; | |
6b61353c | 1362 | prev_vpos = vpos; |
529724fe | 1363 | prev_tab_offset = tab_offset; |
fe0066f5 | 1364 | } |
2ab90d49 KH |
1365 | } |
1366 | else | |
1367 | { | |
1368 | /* Continuing. */ | |
a997a7ca KH |
1369 | /* Remember the previous value. */ |
1370 | prev_tab_offset = tab_offset; | |
1371 | ||
c9c0f7cf | 1372 | if (wide_column_end_hpos > width) |
a997a7ca KH |
1373 | { |
1374 | hpos -= prev_hpos; | |
1375 | tab_offset += prev_hpos; | |
1376 | } | |
1377 | else | |
1378 | { | |
1379 | tab_offset += width; | |
1380 | hpos -= width; | |
1381 | } | |
1382 | vpos++; | |
1383 | contin_hpos = prev_hpos; | |
1384 | prev_hpos = 0; | |
6cbc951e | 1385 | prev_vpos = vpos; |
2ab90d49 KH |
1386 | } |
1387 | } | |
1388 | ||
1389 | /* Stop if past the target buffer position or screen position. */ | |
33fe7d20 | 1390 | if (pos > to) |
a997a7ca KH |
1391 | { |
1392 | /* Go back to the previous position. */ | |
1393 | pos = prev_pos; | |
fe0066f5 | 1394 | pos_byte = prev_pos_byte; |
a997a7ca | 1395 | hpos = prev_hpos; |
6b61353c | 1396 | vpos = prev_vpos; |
a997a7ca KH |
1397 | tab_offset = prev_tab_offset; |
1398 | ||
1399 | /* NOTE on contin_hpos, hpos, and prev_hpos. | |
1400 | ||
1401 | ---------- | |
1402 | abcdefgh\\ | |
1403 | W_ ^---- contin_hpos | |
1404 | | ^----- hpos | |
1405 | \---- prev_hpos | |
1406 | ---------- | |
1407 | */ | |
1408 | ||
1409 | if (contin_hpos && prev_hpos == 0 | |
c9c0f7cf | 1410 | && contin_hpos < width && !wide_column_end_hpos) |
a997a7ca KH |
1411 | { |
1412 | /* Line breaking occurs in the middle of multi-column | |
1413 | character. Go back to previous line. */ | |
1414 | hpos = contin_hpos; | |
1415 | vpos = vpos - 1; | |
1416 | } | |
a997a7ca KH |
1417 | break; |
1418 | } | |
1419 | ||
8a00d895 | 1420 | if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos)) |
33fe7d20 RS |
1421 | { |
1422 | if (contin_hpos && prev_hpos == 0 | |
9129bcc3 KH |
1423 | && hpos > tohpos |
1424 | && (contin_hpos == width || wide_column_end_hpos > width)) | |
33fe7d20 RS |
1425 | { /* Line breaks because we can't put the character at the |
1426 | previous line any more. It is not the multi-column | |
1427 | character continued in middle. Go back to previous | |
1428 | buffer position, screen position, and set tab offset | |
1429 | to previous value. It's the beginning of the | |
1430 | line. */ | |
1431 | pos = prev_pos; | |
1432 | pos_byte = prev_pos_byte; | |
1433 | hpos = prev_hpos; | |
6b61353c | 1434 | vpos = prev_vpos; |
33fe7d20 RS |
1435 | tab_offset = prev_tab_offset; |
1436 | } | |
1437 | break; | |
1438 | } | |
a997a7ca | 1439 | if (pos == ZV) /* We cannot go beyond ZV. Stop here. */ |
2ab90d49 KH |
1440 | break; |
1441 | ||
2ab90d49 | 1442 | prev_hpos = hpos; |
6b61353c | 1443 | prev_vpos = vpos; |
a997a7ca | 1444 | prev_pos = pos; |
fe0066f5 | 1445 | prev_pos_byte = pos_byte; |
c9c0f7cf | 1446 | wide_column_end_hpos = 0; |
0aa01123 JB |
1447 | |
1448 | /* Consult the width run cache to see if we can avoid inspecting | |
1449 | the text character-by-character. */ | |
1450 | if (current_buffer->width_run_cache && pos >= next_width_run) | |
1451 | { | |
1452 | int run_end; | |
1453 | int common_width | |
1454 | = region_cache_forward (current_buffer, | |
1455 | current_buffer->width_run_cache, | |
1456 | pos, &run_end); | |
1457 | ||
1458 | /* A width of zero means the character's width varies (like | |
1459 | a tab), is meaningless (like a newline), or we just don't | |
1460 | want to skip over it for some other reason. */ | |
1461 | if (common_width != 0) | |
1462 | { | |
1463 | int run_end_hpos; | |
1464 | ||
1465 | /* Don't go past the final buffer posn the user | |
1466 | requested. */ | |
1467 | if (run_end > to) | |
1468 | run_end = to; | |
1469 | ||
1470 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1471 | ||
1472 | /* Don't go past the final horizontal position the user | |
1473 | requested. */ | |
1474 | if (vpos == tovpos && run_end_hpos > tohpos) | |
1475 | { | |
1476 | run_end = pos + (tohpos - hpos) / common_width; | |
1477 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1478 | } | |
2ff4775b | 1479 | |
0aa01123 JB |
1480 | /* Don't go past the margin. */ |
1481 | if (run_end_hpos >= width) | |
1482 | { | |
1483 | run_end = pos + (width - hpos) / common_width; | |
1484 | run_end_hpos = hpos + (run_end - pos) * common_width; | |
1485 | } | |
1486 | ||
1487 | hpos = run_end_hpos; | |
1488 | if (run_end > pos) | |
1489 | prev_hpos = hpos - common_width; | |
fe0066f5 RS |
1490 | if (pos != run_end) |
1491 | { | |
1492 | pos = run_end; | |
1493 | pos_byte = CHAR_TO_BYTE (pos); | |
1494 | } | |
0aa01123 JB |
1495 | } |
1496 | ||
1497 | next_width_run = run_end + 1; | |
1498 | } | |
1499 | ||
1500 | /* We have to scan the text character-by-character. */ | |
993b6404 | 1501 | else |
2ab90d49 | 1502 | { |
88c6e37e GM |
1503 | EMACS_INT i, n; |
1504 | Lisp_Object charvec; | |
097812fb | 1505 | |
012fd715 | 1506 | /* Check composition sequence. */ |
d6721dda KH |
1507 | if (cmp_it.id >= 0 |
1508 | || (pos == cmp_it.stop_pos | |
1509 | && composition_reseat_it (&cmp_it, pos, pos_byte, to, win, | |
1510 | NULL, Qnil))) | |
1511 | composition_update_it (&cmp_it, pos, pos_byte, Qnil); | |
1512 | if (cmp_it.id >= 0) | |
1513 | { | |
1514 | pos += cmp_it.nchars; | |
1515 | pos_byte += cmp_it.nbytes; | |
1516 | hpos += cmp_it.width; | |
1517 | if (cmp_it.to == cmp_it.nglyphs) | |
1518 | { | |
1519 | cmp_it.id = -1; | |
1520 | composition_compute_stop_pos (&cmp_it, pos, pos_byte, to, | |
1521 | Qnil); | |
1522 | } | |
1523 | else | |
1524 | cmp_it.from = cmp_it.to; | |
1525 | continue; | |
1526 | } | |
012fd715 | 1527 | |
d6721dda | 1528 | c = FETCH_BYTE (pos_byte); |
fe0066f5 | 1529 | pos++, pos_byte++; |
0aa01123 | 1530 | |
2ab90d49 KH |
1531 | /* Perhaps add some info to the width_run_cache. */ |
1532 | if (current_buffer->width_run_cache) | |
1533 | { | |
1534 | /* Is this character part of the current run? If so, extend | |
1535 | the run. */ | |
1536 | if (pos - 1 == width_run_end | |
5db0afb7 | 1537 | && XFASTINT (width_table[c]) == width_run_width) |
2ab90d49 KH |
1538 | width_run_end = pos; |
1539 | ||
1540 | /* The previous run is over, since this is a character at a | |
1541 | different position, or a different width. */ | |
1542 | else | |
1543 | { | |
1544 | /* Have we accumulated a run to put in the cache? | |
1545 | (Currently, we only cache runs of width == 1). */ | |
1546 | if (width_run_start < width_run_end | |
1547 | && width_run_width == 1) | |
1548 | know_region_cache (current_buffer, | |
1549 | current_buffer->width_run_cache, | |
1550 | width_run_start, width_run_end); | |
1551 | ||
1552 | /* Start recording a new width run. */ | |
5db0afb7 | 1553 | width_run_width = XFASTINT (width_table[c]); |
2ab90d49 KH |
1554 | width_run_start = pos - 1; |
1555 | width_run_end = pos; | |
1556 | } | |
1557 | } | |
993b6404 | 1558 | |
c9c0f7cf | 1559 | if (dp != 0 |
409f2919 | 1560 | && ! (multibyte && LEADING_CODE_P (c)) |
c9c0f7cf | 1561 | && VECTORP (DISP_CHAR_VECTOR (dp, c))) |
993b6404 | 1562 | { |
88c6e37e GM |
1563 | charvec = DISP_CHAR_VECTOR (dp, c); |
1564 | n = ASIZE (charvec); | |
993b6404 | 1565 | } |
88c6e37e | 1566 | else |
993b6404 | 1567 | { |
88c6e37e GM |
1568 | charvec = Qnil; |
1569 | n = 1; | |
1570 | } | |
1571 | ||
1572 | for (i = n - 1; i >= 0; --i) | |
1573 | { | |
1574 | if (VECTORP (charvec)) | |
2ab90d49 | 1575 | { |
88c6e37e GM |
1576 | /* This should be handled the same as |
1577 | next_element_from_display_vector does it. */ | |
1578 | Lisp_Object entry = AREF (charvec, i); | |
097812fb | 1579 | |
f59836fe KS |
1580 | if (GLYPH_CODE_P (entry) |
1581 | && GLYPH_CODE_CHAR_VALID_P (entry)) | |
1582 | c = GLYPH_CODE_CHAR (entry); | |
88c6e37e GM |
1583 | else |
1584 | c = ' '; | |
1585 | } | |
097812fb | 1586 | |
88c6e37e GM |
1587 | if (c >= 040 && c < 0177) |
1588 | hpos++; | |
1589 | else if (c == '\t') | |
1590 | { | |
1591 | int tem = ((hpos + tab_offset + hscroll - (hscroll > 0)) | |
1592 | % tab_width); | |
1593 | if (tem < 0) | |
1594 | tem += tab_width; | |
1595 | hpos += tab_width - tem; | |
1596 | } | |
1597 | else if (c == '\n') | |
1598 | { | |
1599 | if (selective > 0 | |
097812fb | 1600 | && indented_beyond_p (pos, pos_byte, |
76e20cb0 | 1601 | (double) selective)) /* iftc */ |
2ab90d49 | 1602 | { |
88c6e37e GM |
1603 | /* If (pos == to), we don't have to take care of |
1604 | selective display. */ | |
1605 | if (pos < to) | |
fe0066f5 | 1606 | { |
88c6e37e GM |
1607 | /* Skip any number of invisible lines all at once */ |
1608 | do | |
1609 | { | |
1610 | pos = find_before_next_newline (pos, to, 1); | |
1611 | if (pos < to) | |
1612 | pos++; | |
1613 | pos_byte = CHAR_TO_BYTE (pos); | |
1614 | } | |
1615 | while (pos < to | |
097812fb | 1616 | && indented_beyond_p (pos, pos_byte, |
76e20cb0 | 1617 | (double) selective)); /* iftc */ |
88c6e37e GM |
1618 | /* Allow for the " ..." that is displayed for them. */ |
1619 | if (selective_rlen) | |
1620 | { | |
1621 | hpos += selective_rlen; | |
1622 | if (hpos >= width) | |
1623 | hpos = width; | |
1624 | } | |
1625 | DEC_BOTH (pos, pos_byte); | |
1626 | /* We have skipped the invis text, but not the | |
1627 | newline after. */ | |
fe0066f5 | 1628 | } |
2ab90d49 | 1629 | } |
88c6e37e GM |
1630 | else |
1631 | { | |
1632 | /* A visible line. */ | |
1633 | vpos++; | |
1634 | hpos = 0; | |
1635 | hpos -= hscroll; | |
1636 | /* Count the truncation glyph on column 0 */ | |
1637 | if (hscroll > 0) | |
ed5c373c | 1638 | hpos += continuation_glyph_width; |
88c6e37e GM |
1639 | tab_offset = 0; |
1640 | } | |
1641 | contin_hpos = 0; | |
2ab90d49 | 1642 | } |
88c6e37e | 1643 | else if (c == CR && selective < 0) |
fe0066f5 | 1644 | { |
88c6e37e GM |
1645 | /* In selective display mode, |
1646 | everything from a ^M to the end of the line is invisible. | |
1647 | Stop *before* the real newline. */ | |
1648 | if (pos < to) | |
1649 | { | |
1650 | pos = find_before_next_newline (pos, to, 1); | |
1651 | pos_byte = CHAR_TO_BYTE (pos); | |
1652 | } | |
1653 | /* If we just skipped next_boundary, | |
1654 | loop around in the main while | |
1655 | and handle it. */ | |
1656 | if (pos > next_boundary) | |
1657 | next_boundary = pos; | |
1658 | /* Allow for the " ..." that is displayed for them. */ | |
1659 | if (selective_rlen) | |
1660 | { | |
1661 | hpos += selective_rlen; | |
1662 | if (hpos >= width) | |
1663 | hpos = width; | |
1664 | } | |
fe0066f5 | 1665 | } |
409f2919 | 1666 | else if (multibyte && LEADING_CODE_P (c)) |
2ab90d49 | 1667 | { |
88c6e37e GM |
1668 | /* Start of multi-byte form. */ |
1669 | unsigned char *ptr; | |
1670 | int bytes, width, wide_column; | |
1671 | ||
1672 | pos_byte--; /* rewind POS_BYTE */ | |
1673 | ptr = BYTE_POS_ADDR (pos_byte); | |
1674 | MULTIBYTE_BYTES_WIDTH (ptr, dp); | |
1675 | pos_byte += bytes; | |
1676 | if (wide_column) | |
1677 | wide_column_end_hpos = hpos + wide_column; | |
1678 | hpos += width; | |
2ab90d49 | 1679 | } |
f1004faf GM |
1680 | else if (VECTORP (charvec)) |
1681 | ++hpos; | |
88c6e37e GM |
1682 | else |
1683 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; | |
2ab90d49 | 1684 | } |
993b6404 JB |
1685 | } |
1686 | } | |
1687 | ||
98136db3 RS |
1688 | after_loop: |
1689 | ||
0aa01123 JB |
1690 | /* Remember any final width run in the cache. */ |
1691 | if (current_buffer->width_run_cache | |
1692 | && width_run_width == 1 | |
1693 | && width_run_start < width_run_end) | |
1694 | know_region_cache (current_buffer, current_buffer->width_run_cache, | |
1695 | width_run_start, width_run_end); | |
1696 | ||
993b6404 | 1697 | val_compute_motion.bufpos = pos; |
fe0066f5 | 1698 | val_compute_motion.bytepos = pos_byte; |
cde9337b JB |
1699 | val_compute_motion.hpos = hpos; |
1700 | val_compute_motion.vpos = vpos; | |
ef3af330 AS |
1701 | if (contin_hpos && prev_hpos == 0) |
1702 | val_compute_motion.prevhpos = contin_hpos; | |
1703 | else | |
1704 | val_compute_motion.prevhpos = prev_hpos; | |
927b5a55 RS |
1705 | /* We alalways handle all of them here; none of them remain to do. */ |
1706 | val_compute_motion.ovstring_chars_done = 0; | |
993b6404 JB |
1707 | |
1708 | /* Nonzero if have just continued a line */ | |
a997a7ca | 1709 | val_compute_motion.contin = (contin_hpos && prev_hpos == 0); |
993b6404 | 1710 | |
e4500116 | 1711 | immediate_quit = 0; |
993b6404 JB |
1712 | return &val_compute_motion; |
1713 | } | |
993b6404 | 1714 | |
8720a429 | 1715 | |
88af3af4 | 1716 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
8c1a1077 PJ |
1717 | doc: /* Scan through the current buffer, calculating screen position. |
1718 | Scan the current buffer forward from offset FROM, | |
1719 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
1720 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
1721 | and return the ending buffer position and screen location. | |
1722 | ||
361f14bf KS |
1723 | If TOPOS is nil, the actual width and height of the window's |
1724 | text area are used. | |
1725 | ||
8c1a1077 PJ |
1726 | There are three additional arguments: |
1727 | ||
1728 | WIDTH is the number of columns available to display text; | |
361f14bf KS |
1729 | this affects handling of continuation lines. A value of nil |
1730 | corresponds to the actual number of available text columns. | |
8c1a1077 PJ |
1731 | |
1732 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
1733 | HSCROLL is the number of columns not being displayed at the left | |
1734 | margin; this is usually taken from a window's hscroll member. | |
1735 | TAB-OFFSET is the number of columns of the first tab that aren't | |
1736 | being displayed, perhaps because the line was continued within it. | |
1737 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
1738 | ||
1739 | WINDOW is the window to operate on. It is used to choose the display table; | |
1740 | if it is showing the current buffer, it is used also for | |
1741 | deciding which overlay properties apply. | |
1742 | Note that `compute-motion' always operates on the current buffer. | |
1743 | ||
1744 | The value is a list of five elements: | |
1745 | (POS HPOS VPOS PREVHPOS CONTIN) | |
1746 | POS is the buffer position where the scan stopped. | |
1747 | VPOS is the vertical position where the scan stopped. | |
1748 | HPOS is the horizontal position where the scan stopped. | |
1749 | ||
1750 | PREVHPOS is the horizontal position one character back from POS. | |
1751 | CONTIN is t if a line was continued after (or within) the previous character. | |
1752 | ||
1753 | For example, to find the buffer position of column COL of line LINE | |
1754 | of a certain window, pass the window's starting location as FROM | |
1755 | and the window's upper-left coordinates as FROMPOS. | |
1756 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
1757 | visible section of the buffer, and pass LINE and COL as TOPOS. */) | |
5842a27b | 1758 | (Lisp_Object from, Lisp_Object frompos, Lisp_Object to, Lisp_Object topos, Lisp_Object width, Lisp_Object offsets, Lisp_Object window) |
42918ba5 | 1759 | { |
361f14bf | 1760 | struct window *w; |
8798a92b | 1761 | Lisp_Object bufpos, hpos, vpos, prevhpos; |
42918ba5 RS |
1762 | struct position *pos; |
1763 | int hscroll, tab_offset; | |
1764 | ||
b7826503 PJ |
1765 | CHECK_NUMBER_COERCE_MARKER (from); |
1766 | CHECK_CONS (frompos); | |
1767 | CHECK_NUMBER_CAR (frompos); | |
1768 | CHECK_NUMBER_CDR (frompos); | |
1769 | CHECK_NUMBER_COERCE_MARKER (to); | |
361f14bf KS |
1770 | if (!NILP (topos)) |
1771 | { | |
1772 | CHECK_CONS (topos); | |
1773 | CHECK_NUMBER_CAR (topos); | |
1774 | CHECK_NUMBER_CDR (topos); | |
1775 | } | |
1776 | if (!NILP (width)) | |
1777 | CHECK_NUMBER (width); | |
1778 | ||
42918ba5 RS |
1779 | if (!NILP (offsets)) |
1780 | { | |
b7826503 PJ |
1781 | CHECK_CONS (offsets); |
1782 | CHECK_NUMBER_CAR (offsets); | |
1783 | CHECK_NUMBER_CDR (offsets); | |
70949dac KR |
1784 | hscroll = XINT (XCAR (offsets)); |
1785 | tab_offset = XINT (XCDR (offsets)); | |
42918ba5 RS |
1786 | } |
1787 | else | |
1788 | hscroll = tab_offset = 0; | |
1789 | ||
88af3af4 KH |
1790 | if (NILP (window)) |
1791 | window = Fselected_window (); | |
1792 | else | |
b7826503 | 1793 | CHECK_LIVE_WINDOW (window); |
361f14bf | 1794 | w = XWINDOW (window); |
88af3af4 | 1795 | |
9fdae274 KH |
1796 | if (XINT (from) < BEGV || XINT (from) > ZV) |
1797 | args_out_of_range_3 (from, make_number (BEGV), make_number (ZV)); | |
1798 | if (XINT (to) < BEGV || XINT (to) > ZV) | |
1799 | args_out_of_range_3 (to, make_number (BEGV), make_number (ZV)); | |
1800 | ||
70949dac KR |
1801 | pos = compute_motion (XINT (from), XINT (XCDR (frompos)), |
1802 | XINT (XCAR (frompos)), 0, | |
361f14bf KS |
1803 | XINT (to), |
1804 | (NILP (topos) | |
1805 | ? window_internal_height (w) | |
1806 | : XINT (XCDR (topos))), | |
1807 | (NILP (topos) | |
1808 | ? (window_box_text_cols (w) | |
1809 | - ( | |
1810 | #ifdef HAVE_WINDOW_SYSTEM | |
1811 | FRAME_WINDOW_P (XFRAME (w->frame)) ? 0 : | |
1812 | #endif | |
1813 | 1)) | |
1814 | : XINT (XCAR (topos))), | |
1815 | (NILP (width) ? -1 : XINT (width)), | |
1816 | hscroll, tab_offset, | |
88af3af4 | 1817 | XWINDOW (window)); |
42918ba5 | 1818 | |
94d92e9c | 1819 | XSETFASTINT (bufpos, pos->bufpos); |
f8f645a1 KH |
1820 | XSETINT (hpos, pos->hpos); |
1821 | XSETINT (vpos, pos->vpos); | |
1822 | XSETINT (prevhpos, pos->prevhpos); | |
42918ba5 RS |
1823 | |
1824 | return Fcons (bufpos, | |
1825 | Fcons (hpos, | |
1826 | Fcons (vpos, | |
1827 | Fcons (prevhpos, | |
1828 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); | |
1829 | ||
1830 | } | |
993b6404 | 1831 | \f |
0aa01123 | 1832 | /* Fvertical_motion and vmotion */ |
88c6e37e | 1833 | |
993b6404 JB |
1834 | struct position val_vmotion; |
1835 | ||
1836 | struct position * | |
971de7fb | 1837 | vmotion (register EMACS_INT from, register EMACS_INT vtarget, struct window *w) |
993b6404 | 1838 | { |
83155776 | 1839 | EMACS_INT hscroll = XINT (w->hscroll); |
993b6404 JB |
1840 | struct position pos; |
1841 | /* vpos is cumulative vertical position, changed as from is changed */ | |
1842 | register int vpos = 0; | |
83155776 SM |
1843 | EMACS_INT prevline; |
1844 | register EMACS_INT first; | |
1845 | EMACS_INT from_byte; | |
1846 | EMACS_INT lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
993b6404 | 1847 | int selective |
eeaafd4f KH |
1848 | = (INTEGERP (current_buffer->selective_display) |
1849 | ? XINT (current_buffer->selective_display) | |
1850 | : !NILP (current_buffer->selective_display) ? -1 : 0); | |
99ce22d5 | 1851 | Lisp_Object window; |
83155776 | 1852 | EMACS_INT start_hpos = 0; |
2ab90d49 | 1853 | int did_motion; |
7ac57cb3 RS |
1854 | /* This is the object we use for fetching character properties. */ |
1855 | Lisp_Object text_prop_object; | |
99ce22d5 KH |
1856 | |
1857 | XSETWINDOW (window, w); | |
1858 | ||
7ac57cb3 RS |
1859 | /* If the window contains this buffer, use it for getting text properties. |
1860 | Otherwise use the current buffer as arg for doing that. */ | |
1861 | if (EQ (w->buffer, Fcurrent_buffer ())) | |
1862 | text_prop_object = window; | |
1863 | else | |
1864 | text_prop_object = Fcurrent_buffer (); | |
1865 | ||
99ce22d5 | 1866 | if (vpos >= vtarget) |
993b6404 | 1867 | { |
99ce22d5 | 1868 | /* To move upward, go a line at a time until |
fe0066f5 | 1869 | we have gone at least far enough. */ |
99ce22d5 KH |
1870 | |
1871 | first = 1; | |
1872 | ||
1873 | while ((vpos > vtarget || first) && from > BEGV) | |
993b6404 | 1874 | { |
66c75ca5 RS |
1875 | Lisp_Object propval; |
1876 | ||
2965dff9 RS |
1877 | prevline = find_next_newline_no_quit (from - 1, -1); |
1878 | while (prevline > BEGV | |
5a05d3d2 | 1879 | && ((selective > 0 |
2965dff9 RS |
1880 | && indented_beyond_p (prevline, |
1881 | CHAR_TO_BYTE (prevline), | |
76e20cb0 | 1882 | (double) selective)) /* iftc */ |
2965dff9 RS |
1883 | /* Watch out for newlines with `invisible' property. |
1884 | When moving upward, check the newline before. */ | |
1885 | || (propval = Fget_char_property (make_number (prevline - 1), | |
66c75ca5 | 1886 | Qinvisible, |
7ac57cb3 | 1887 | text_prop_object), |
339ee979 | 1888 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1889 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1890 | pos = *compute_motion (prevline, 0, | |
1891 | lmargin + (prevline == BEG ? start_hpos : 0), | |
2ab90d49 | 1892 | 0, |
097812fb | 1893 | from, |
a997a7ca KH |
1894 | /* Don't care for VPOS... */ |
1895 | 1 << (BITS_PER_SHORT - 1), | |
1896 | /* ... nor HPOS. */ | |
1897 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1898 | -1, hscroll, |
2dd4e608 RS |
1899 | /* This compensates for start_hpos |
1900 | so that a tab as first character | |
1901 | still occupies 8 columns. */ | |
2965dff9 | 1902 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1903 | w); |
99ce22d5 KH |
1904 | vpos -= pos.vpos; |
1905 | first = 0; | |
2965dff9 | 1906 | from = prevline; |
993b6404 | 1907 | } |
99ce22d5 KH |
1908 | |
1909 | /* If we made exactly the desired vertical distance, | |
1910 | or if we hit beginning of buffer, | |
1911 | return point found */ | |
1912 | if (vpos >= vtarget) | |
993b6404 | 1913 | { |
99ce22d5 | 1914 | val_vmotion.bufpos = from; |
fe0066f5 | 1915 | val_vmotion.bytepos = CHAR_TO_BYTE (from); |
99ce22d5 KH |
1916 | val_vmotion.vpos = vpos; |
1917 | val_vmotion.hpos = lmargin; | |
1918 | val_vmotion.contin = 0; | |
1919 | val_vmotion.prevhpos = 0; | |
927b5a55 | 1920 | val_vmotion.ovstring_chars_done = 0; |
a997a7ca | 1921 | val_vmotion.tab_offset = 0; /* For accumulating tab offset. */ |
99ce22d5 | 1922 | return &val_vmotion; |
993b6404 | 1923 | } |
993b6404 | 1924 | |
99ce22d5 KH |
1925 | /* Otherwise find the correct spot by moving down */ |
1926 | } | |
1927 | /* Moving downward is simple, but must calculate from beg of line | |
1928 | to determine hpos of starting point */ | |
fe0066f5 RS |
1929 | from_byte = CHAR_TO_BYTE (from); |
1930 | if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n') | |
993b6404 | 1931 | { |
2ab90d49 | 1932 | Lisp_Object propval; |
66c75ca5 | 1933 | |
2965dff9 RS |
1934 | prevline = find_next_newline_no_quit (from, -1); |
1935 | while (prevline > BEGV | |
99ce22d5 | 1936 | && ((selective > 0 |
2965dff9 RS |
1937 | && indented_beyond_p (prevline, |
1938 | CHAR_TO_BYTE (prevline), | |
76e20cb0 | 1939 | (double) selective)) /* iftc */ |
2965dff9 RS |
1940 | /* Watch out for newlines with `invisible' property. |
1941 | When moving downward, check the newline after. */ | |
1942 | || (propval = Fget_char_property (make_number (prevline), | |
1943 | Qinvisible, | |
7ac57cb3 | 1944 | text_prop_object), |
339ee979 | 1945 | TEXT_PROP_MEANS_INVISIBLE (propval)))) |
2965dff9 RS |
1946 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
1947 | pos = *compute_motion (prevline, 0, | |
1948 | lmargin + (prevline == BEG | |
92992c7e | 1949 | ? start_hpos : 0), |
2ab90d49 | 1950 | 0, |
097812fb | 1951 | from, |
a997a7ca KH |
1952 | /* Don't care for VPOS... */ |
1953 | 1 << (BITS_PER_SHORT - 1), | |
1954 | /* ... nor HPOS. */ | |
1955 | 1 << (BITS_PER_SHORT - 1), | |
361f14bf | 1956 | -1, hscroll, |
2965dff9 | 1957 | (prevline == BEG ? -start_hpos : 0), |
2dd4e608 | 1958 | w); |
2ab90d49 | 1959 | did_motion = 1; |
993b6404 | 1960 | } |
99ce22d5 | 1961 | else |
993b6404 | 1962 | { |
99ce22d5 KH |
1963 | pos.hpos = lmargin + (from == BEG ? start_hpos : 0); |
1964 | pos.vpos = 0; | |
a997a7ca | 1965 | pos.tab_offset = 0; |
2ab90d49 | 1966 | did_motion = 0; |
993b6404 | 1967 | } |
2ab90d49 | 1968 | return compute_motion (from, vpos, pos.hpos, did_motion, |
a997a7ca | 1969 | ZV, vtarget, - (1 << (BITS_PER_SHORT - 1)), |
361f14bf | 1970 | -1, hscroll, |
a997a7ca | 1971 | pos.tab_offset - (from == BEG ? start_hpos : 0), |
2dd4e608 | 1972 | w); |
993b6404 JB |
1973 | } |
1974 | ||
f1ecfe9b | 1975 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
8c1a1077 PJ |
1976 | doc: /* Move point to start of the screen line LINES lines down. |
1977 | If LINES is negative, this means moving up. | |
1978 | ||
1979 | This function is an ordinary cursor motion function | |
1980 | which calculates the new position based on how text would be displayed. | |
1981 | The new position may be the start of a line, | |
1982 | or just the start of a continuation line. | |
1983 | The function returns number of screen lines moved over; | |
1984 | that usually equals LINES, but may be closer to zero | |
1985 | if beginning or end of buffer was reached. | |
1986 | ||
1987 | The optional second argument WINDOW specifies the window to use for | |
1988 | parameters such as width, horizontal scrolling, and so on. | |
1989 | The default is to use the selected window's parameters. | |
1990 | ||
c876b227 SM |
1991 | LINES can optionally take the form (COLS . LINES), in which case |
1992 | the motion will not stop at the start of a screen line but on | |
1993 | its column COLS (if such exists on that line, that is). | |
1994 | ||
8c1a1077 PJ |
1995 | `vertical-motion' always uses the current buffer, |
1996 | regardless of which buffer is displayed in WINDOW. | |
1997 | This is consistent with other cursor motion functions | |
1998 | and makes it possible to use `vertical-motion' in any buffer, | |
1999 | whether or not it is currently displayed in some window. */) | |
5842a27b | 2000 | (Lisp_Object lines, Lisp_Object window) |
993b6404 | 2001 | { |
8720a429 GM |
2002 | struct it it; |
2003 | struct text_pos pt; | |
8720a429 | 2004 | struct window *w; |
39210e90 GM |
2005 | Lisp_Object old_buffer; |
2006 | struct gcpro gcpro1; | |
baed8445 SM |
2007 | Lisp_Object lcols = Qnil; |
2008 | double cols; | |
c876b227 SM |
2009 | |
2010 | /* Allow LINES to be of the form (HPOS . VPOS) aka (COLUMNS . LINES). */ | |
2011 | if (CONSP (lines) && (NUMBERP (XCAR (lines)))) | |
2012 | { | |
baed8445 SM |
2013 | lcols = XCAR (lines); |
2014 | cols = INTEGERP (lcols) ? (double) XINT (lcols) : XFLOAT_DATA (lcols); | |
c876b227 SM |
2015 | lines = XCDR (lines); |
2016 | } | |
993b6404 | 2017 | |
b7826503 | 2018 | CHECK_NUMBER (lines); |
f1ecfe9b | 2019 | if (! NILP (window)) |
b7826503 | 2020 | CHECK_WINDOW (window); |
f1ecfe9b | 2021 | else |
92992c7e | 2022 | window = selected_window; |
8720a429 | 2023 | w = XWINDOW (window); |
39210e90 GM |
2024 | |
2025 | old_buffer = Qnil; | |
2026 | GCPRO1 (old_buffer); | |
2027 | if (XBUFFER (w->buffer) != current_buffer) | |
8720a429 | 2028 | { |
39210e90 GM |
2029 | /* Set the window's buffer temporarily to the current buffer. */ |
2030 | old_buffer = w->buffer; | |
2031 | XSETBUFFER (w->buffer, current_buffer); | |
8720a429 | 2032 | } |
097812fb | 2033 | |
6df71429 | 2034 | if (noninteractive) |
9305b0e7 | 2035 | { |
6df71429 RS |
2036 | struct position pos; |
2037 | pos = *vmotion (PT, XINT (lines), w); | |
2038 | SET_PT_BOTH (pos.bufpos, pos.bytepos); | |
9305b0e7 KS |
2039 | } |
2040 | else | |
6df71429 | 2041 | { |
af2be002 | 2042 | int it_start, first_x, it_overshoot_expected; |
24a06d04 | 2043 | |
6df71429 RS |
2044 | SET_TEXT_POS (pt, PT, PT_BYTE); |
2045 | start_display (&it, w, pt); | |
2f4ec7ce | 2046 | first_x = it.first_visible_x; |
24a06d04 | 2047 | it_start = IT_CHARPOS (it); |
14a7cabf | 2048 | |
48cdfb4b CY |
2049 | /* See comments below for why we calculate this. */ |
2050 | if (XINT (lines) > 0) | |
14a7cabf | 2051 | { |
d6721dda KH |
2052 | if (it.cmp_it.id >= 0) |
2053 | it_overshoot_expected = 1; | |
187bc86f | 2054 | else if (it.method == GET_FROM_STRING) |
48cdfb4b CY |
2055 | { |
2056 | const char *s = SDATA (it.string); | |
2057 | const char *e = s + SBYTES (it.string); | |
2058 | while (s < e && *s != '\n') | |
2059 | ++s; | |
2060 | it_overshoot_expected = (s == e) ? -1 : 0; | |
2061 | } | |
2062 | else | |
2063 | it_overshoot_expected = (it.method == GET_FROM_IMAGE | |
d6721dda | 2064 | || it.method == GET_FROM_STRETCH); |
14a7cabf | 2065 | } |
14a7cabf | 2066 | |
48cdfb4b CY |
2067 | /* Scan from the start of the line containing PT. If we don't |
2068 | do this, we start moving with IT->current_x == 0, while PT is | |
2069 | really at some x > 0. */ | |
b54a7539 KS |
2070 | reseat_at_previous_visible_line_start (&it); |
2071 | it.current_x = it.hpos = 0; | |
af2be002 | 2072 | if (IT_CHARPOS (it) != PT) |
11fb10de CY |
2073 | /* We used to temporarily disable selective display here; the |
2074 | comment said this is "so we don't move too far" (2005-01-19 | |
2075 | checkin by kfs). But this does nothing useful that I can | |
2076 | tell, and it causes Bug#2694 . -- cyd */ | |
2077 | move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS); | |
b54a7539 | 2078 | |
48cdfb4b | 2079 | if (XINT (lines) <= 0) |
72ad106b | 2080 | { |
48cdfb4b CY |
2081 | it.vpos = 0; |
2082 | /* Do this even if LINES is 0, so that we move back to the | |
2083 | beginning of the current line as we ought. */ | |
2084 | if (XINT (lines) == 0 || IT_CHARPOS (it) > 0) | |
2085 | move_it_by_lines (&it, XINT (lines), 0); | |
2086 | } | |
2087 | else | |
2088 | { | |
2421af7e | 2089 | if (IT_CHARPOS (it) > it_start) |
48cdfb4b CY |
2090 | { |
2091 | /* IT may move too far if truncate-lines is on and PT | |
2092 | lies beyond the right margin. In that case, | |
2093 | backtrack unless the starting point is on an image, | |
2094 | stretch glyph, composition, or Lisp string. */ | |
2095 | if (!it_overshoot_expected | |
2096 | /* Also, backtrack if the Lisp string contains no | |
2097 | newline, but there is a newline right after it. | |
2098 | In this case, IT overshoots if there is an | |
2099 | after-string just before the newline. */ | |
2100 | || (it_overshoot_expected < 0 | |
2101 | && it.method == GET_FROM_BUFFER | |
2102 | && it.c == '\n')) | |
2103 | move_it_by_lines (&it, -1, 0); | |
2104 | it.vpos = 0; | |
2105 | move_it_by_lines (&it, XINT (lines), 0); | |
2106 | } | |
2107 | else | |
2108 | { | |
2109 | /* Otherwise, we are at the first row occupied by PT, | |
2110 | which might span multiple screen lines (e.g., if it's | |
2111 | on a multi-line display string). We want to start | |
2112 | from the last line that it occupies. */ | |
051facec | 2113 | if (it_start < ZV) |
48cdfb4b | 2114 | { |
2421af7e | 2115 | while (IT_CHARPOS (it) <= it_start) |
d8a7e7fc CY |
2116 | { |
2117 | it.vpos = 0; | |
2118 | move_it_by_lines (&it, 1, 0); | |
2119 | } | |
2120 | if (XINT (lines) > 1) | |
2121 | move_it_by_lines (&it, XINT (lines) - 1, 0); | |
48cdfb4b CY |
2122 | } |
2123 | else | |
d8a7e7fc CY |
2124 | { |
2125 | it.vpos = 0; | |
2126 | move_it_by_lines (&it, XINT (lines), 0); | |
2127 | } | |
48cdfb4b | 2128 | } |
72ad106b | 2129 | } |
097812fb | 2130 | |
2f4ec7ce | 2131 | /* Move to the goal column, if one was specified. */ |
baed8445 | 2132 | if (!NILP (lcols)) |
2f4ec7ce CY |
2133 | { |
2134 | /* If the window was originally hscrolled, move forward by | |
2135 | the hscrolled amount first. */ | |
2136 | if (first_x > 0) | |
2137 | { | |
2138 | move_it_in_display_line (&it, ZV, first_x, MOVE_TO_X); | |
2139 | it.current_x = 0; | |
2140 | } | |
2141 | move_it_in_display_line | |
2142 | (&it, ZV, | |
2143 | (int)(cols * FRAME_COLUMN_WIDTH (XFRAME (w->frame)) + 0.5), | |
2144 | MOVE_TO_X); | |
2145 | } | |
c876b227 | 2146 | |
6df71429 RS |
2147 | SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it)); |
2148 | } | |
8720a429 | 2149 | |
39210e90 GM |
2150 | if (BUFFERP (old_buffer)) |
2151 | w->buffer = old_buffer; | |
097812fb | 2152 | |
39210e90 | 2153 | RETURN_UNGCPRO (make_number (it.vpos)); |
993b6404 | 2154 | } |
8720a429 GM |
2155 | |
2156 | ||
993b6404 | 2157 | \f |
88c6e37e | 2158 | /* File's initialization. */ |
0aa01123 | 2159 | |
dfcf069d | 2160 | void |
971de7fb | 2161 | syms_of_indent (void) |
993b6404 JB |
2162 | { |
2163 | DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode, | |
c86f7377 | 2164 | doc: /* *Indentation can insert tabs if this is non-nil. */); |
993b6404 JB |
2165 | indent_tabs_mode = 1; |
2166 | ||
2167 | defsubr (&Scurrent_indentation); | |
2168 | defsubr (&Sindent_to); | |
2169 | defsubr (&Scurrent_column); | |
2170 | defsubr (&Smove_to_column); | |
2171 | defsubr (&Svertical_motion); | |
42918ba5 | 2172 | defsubr (&Scompute_motion); |
993b6404 | 2173 | } |
6b61353c KH |
2174 | |
2175 | /* arch-tag: 9adfea44-71f7-4988-8ee3-96da15c502cc | |
2176 | (do not change this comment) */ |