Commit | Line | Data |
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ca4c9455 | 1 | /* Composite sequence support. |
aaef169d | 2 | Copyright (C) 2001, 2002, 2003, 2004, 2005, |
76b6f707 GM |
3 | 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
4 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 | |
ce03bf76 KH |
5 | National Institute of Advanced Industrial Science and Technology (AIST) |
6 | Registration Number H14PRO021 | |
f30d8d94 | 7 | Copyright (C) 2003, 2006 |
1527c36e KH |
8 | National Institute of Advanced Industrial Science and Technology (AIST) |
9 | Registration Number H13PRO009 | |
ca4c9455 KH |
10 | |
11 | This file is part of GNU Emacs. | |
12 | ||
9ec0b715 | 13 | GNU Emacs is free software: you can redistribute it and/or modify |
ca4c9455 | 14 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
15 | the Free Software Foundation, either version 3 of the License, or |
16 | (at your option) any later version. | |
ca4c9455 KH |
17 | |
18 | GNU Emacs is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 24 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
ca4c9455 KH |
25 | |
26 | #include <config.h> | |
27 | #include "lisp.h" | |
28 | #include "buffer.h" | |
1527c36e | 29 | #include "character.h" |
f5199465 | 30 | #include "coding.h" |
ca4c9455 | 31 | #include "intervals.h" |
58753d74 KH |
32 | #include "window.h" |
33 | #include "frame.h" | |
34 | #include "dispextern.h" | |
35 | #include "font.h" | |
f5199465 KH |
36 | #include "termhooks.h" |
37 | ||
ca4c9455 KH |
38 | |
39 | /* Emacs uses special text property `composition' to support character | |
40 | composition. A sequence of characters that have the same (i.e. eq) | |
41 | `composition' property value is treated as a single composite | |
42 | sequence (we call it just `composition' here after). Characters in | |
43 | a composition are all composed somehow on the screen. | |
44 | ||
45 | The property value has this form when the composition is made: | |
46 | ((LENGTH . COMPONENTS) . MODIFICATION-FUNC) | |
47 | then turns to this form: | |
48 | (COMPOSITION-ID . (LENGTH COMPONENTS-VEC . MODIFICATION-FUNC)) | |
49 | when the composition is registered in composition_hash_table and | |
50 | composition_table. These rather peculiar structures were designed | |
51 | to make it easy to distinguish them quickly (we can do that by | |
52 | checking only the first element) and to extract LENGTH (from the | |
53 | former form) and COMPOSITION-ID (from the latter form). | |
54 | ||
55 | We register a composition when it is displayed, or when the width | |
56 | is required (for instance, to calculate columns). | |
57 | ||
58 | LENGTH -- Length of the composition. This information is used to | |
59 | check the validity of the composition. | |
60 | ||
61 | COMPONENTS -- Character, string, vector, list, or nil. | |
62 | ||
63 | If it is nil, characters in the text are composed relatively | |
64 | according to their metrics in font glyphs. | |
65 | ||
66 | If it is a character or a string, the character or characters | |
67 | in the string are composed relatively. | |
68 | ||
69 | If it is a vector or list of integers, the element is a | |
70 | character or an encoded composition rule. The characters are | |
71 | composed according to the rules. (2N)th elements are | |
72 | characters to be composed and (2N+1)th elements are | |
73 | composition rules to tell how to compose (2N+2)th element with | |
74 | the previously composed 2N glyphs. | |
75 | ||
76 | COMPONENTS-VEC -- Vector of integers. In relative composition, the | |
77 | elements are characters to be composed. In rule-base | |
78 | composition, the elements are characters or encoded | |
79 | composition rules. | |
80 | ||
81 | MODIFICATION-FUNC -- If non nil, it is a function to call when the | |
82 | composition gets invalid after a modification in a buffer. If | |
83 | it is nil, a function in `composition-function-table' of the | |
84 | first character in the sequence is called. | |
85 | ||
86 | COMPOSITION-ID --Identification number of the composition. It is | |
87 | used as an index to composition_table for the composition. | |
88 | ||
89 | When Emacs has to display a composition or has to know its | |
90 | displaying width, the function get_composition_id is called. It | |
91 | returns COMPOSITION-ID so that the caller can access the | |
92 | information about the composition through composition_table. If a | |
93 | COMPOSITION-ID has not yet been assigned to the composition, | |
94 | get_composition_id checks the validity of `composition' property, | |
95 | and, if valid, assigns a new ID, registers the information in | |
96 | composition_hash_table and composition_table, and changes the form | |
97 | of the property value. If the property is invalid, return -1 | |
98 | without changing the property value. | |
99 | ||
100 | We use two tables to keep information about composition; | |
101 | composition_hash_table and composition_table. | |
102 | ||
103 | The former is a hash table in which keys are COMPONENTS-VECs and | |
104 | values are the corresponding COMPOSITION-IDs. This hash table is | |
4abc7470 | 105 | weak, but as each key (COMPONENTS-VEC) is also kept as a value of the |
ca4c9455 | 106 | `composition' property, it won't be collected as garbage until all |
4abc7470 | 107 | bits of text that have the same COMPONENTS-VEC are deleted. |
ca4c9455 KH |
108 | |
109 | The latter is a table of pointers to `struct composition' indexed | |
4abc7470 | 110 | by COMPOSITION-ID. This structure keeps the other information (see |
ca4c9455 KH |
111 | composite.h). |
112 | ||
113 | In general, a text property holds information about individual | |
114 | characters. But, a `composition' property holds information about | |
4abc7470 | 115 | a sequence of characters (in this sense, it is like the `intangible' |
ca4c9455 | 116 | property). That means that we should not share the property value |
4abc7470 | 117 | in adjacent compositions -- we can't distinguish them if they have the |
ca4c9455 KH |
118 | same property. So, after any changes, we call |
119 | `update_compositions' and change a property of one of adjacent | |
120 | compositions to a copy of it. This function also runs a proper | |
121 | composition modification function to make a composition that gets | |
122 | invalid by the change valid again. | |
123 | ||
4abc7470 | 124 | As the value of the `composition' property holds information about a |
ca4c9455 | 125 | specific range of text, the value gets invalid if we change the |
4abc7470 | 126 | text in the range. We treat the `composition' property as always |
ca4c9455 KH |
127 | rear-nonsticky (currently by setting default-text-properties to |
128 | (rear-nonsticky (composition))) and we never make properties of | |
129 | adjacent compositions identical. Thus, any such changes make the | |
4abc7470 | 130 | range just shorter. So, we can check the validity of the `composition' |
ca4c9455 KH |
131 | property by comparing LENGTH information with the actual length of |
132 | the composition. | |
133 | ||
134 | */ | |
135 | ||
136 | ||
137 | Lisp_Object Qcomposition; | |
138 | ||
139 | /* Table of pointers to the structure `composition' indexed by | |
140 | COMPOSITION-ID. This structure is for storing information about | |
141 | each composition except for COMPONENTS-VEC. */ | |
142 | struct composition **composition_table; | |
143 | ||
144 | /* The current size of `composition_table'. */ | |
145 | static int composition_table_size; | |
146 | ||
147 | /* Number of compositions currently made. */ | |
148 | int n_compositions; | |
149 | ||
150 | /* Hash table for compositions. The key is COMPONENTS-VEC of | |
151 | `composition' property. The value is the corresponding | |
152 | COMPOSITION-ID. */ | |
153 | Lisp_Object composition_hash_table; | |
154 | ||
155 | /* Function to call to adjust composition. */ | |
156 | Lisp_Object Vcompose_chars_after_function; | |
157 | ||
f96ba4c1 KH |
158 | Lisp_Object Qauto_composed; |
159 | Lisp_Object Vauto_composition_function; | |
160 | Lisp_Object Qauto_composition_function; | |
58753d74 | 161 | Lisp_Object Vcomposition_function_table; |
40add26d | 162 | |
895416e3 KH |
163 | /* Maxinum number of characters to lookback to check |
164 | auto-composition. */ | |
165 | #define MAX_AUTO_COMPOSITION_LOOKBACK 3 | |
166 | ||
ea058d2c DL |
167 | EXFUN (Fremove_list_of_text_properties, 4); |
168 | ||
ca4c9455 KH |
169 | /* Temporary variable used in macros COMPOSITION_XXX. */ |
170 | Lisp_Object composition_temp; | |
f30d8d94 | 171 | |
ca4c9455 | 172 | \f |
ca4c9455 KH |
173 | /* Return COMPOSITION-ID of a composition at buffer position |
174 | CHARPOS/BYTEPOS and length NCHARS. The `composition' property of | |
175 | the sequence is PROP. STRING, if non-nil, is a string that | |
176 | contains the composition instead of the current buffer. | |
177 | ||
178 | If the composition is invalid, return -1. */ | |
179 | ||
180 | int | |
181 | get_composition_id (charpos, bytepos, nchars, prop, string) | |
182 | int charpos, bytepos, nchars; | |
183 | Lisp_Object prop, string; | |
184 | { | |
185 | Lisp_Object id, length, components, key, *key_contents; | |
186 | int glyph_len; | |
187 | struct Lisp_Hash_Table *hash_table = XHASH_TABLE (composition_hash_table); | |
188 | int hash_index; | |
189 | unsigned hash_code; | |
190 | struct composition *cmp; | |
191 | int i, ch; | |
192 | ||
193 | /* PROP should be | |
194 | Form-A: ((LENGTH . COMPONENTS) . MODIFICATION-FUNC) | |
195 | or | |
196 | Form-B: (COMPOSITION-ID . (LENGTH COMPONENTS-VEC . MODIFICATION-FUNC)) | |
197 | */ | |
198 | if (nchars == 0 || !CONSP (prop)) | |
199 | goto invalid_composition; | |
200 | ||
201 | id = XCAR (prop); | |
202 | if (INTEGERP (id)) | |
203 | { | |
204 | /* PROP should be Form-B. */ | |
205 | if (XINT (id) < 0 || XINT (id) >= n_compositions) | |
206 | goto invalid_composition; | |
207 | return XINT (id); | |
208 | } | |
209 | ||
210 | /* PROP should be Form-A. | |
211 | Thus, ID should be (LENGTH . COMPONENTS). */ | |
212 | if (!CONSP (id)) | |
213 | goto invalid_composition; | |
214 | length = XCAR (id); | |
215 | if (!INTEGERP (length) || XINT (length) != nchars) | |
216 | goto invalid_composition; | |
217 | ||
218 | components = XCDR (id); | |
219 | ||
220 | /* Check if the same composition has already been registered or not | |
221 | by consulting composition_hash_table. The key for this table is | |
222 | COMPONENTS (converted to a vector COMPONENTS-VEC) or, if it is | |
223 | nil, vector of characters in the composition range. */ | |
224 | if (INTEGERP (components)) | |
225 | key = Fmake_vector (make_number (1), components); | |
226 | else if (STRINGP (components) || CONSP (components)) | |
227 | key = Fvconcat (1, &components); | |
228 | else if (VECTORP (components)) | |
229 | key = components; | |
230 | else if (NILP (components)) | |
231 | { | |
232 | key = Fmake_vector (make_number (nchars), Qnil); | |
233 | if (STRINGP (string)) | |
234 | for (i = 0; i < nchars; i++) | |
235 | { | |
236 | FETCH_STRING_CHAR_ADVANCE (ch, string, charpos, bytepos); | |
237 | XVECTOR (key)->contents[i] = make_number (ch); | |
238 | } | |
239 | else | |
240 | for (i = 0; i < nchars; i++) | |
241 | { | |
242 | FETCH_CHAR_ADVANCE (ch, charpos, bytepos); | |
243 | XVECTOR (key)->contents[i] = make_number (ch); | |
244 | } | |
245 | } | |
246 | else | |
247 | goto invalid_composition; | |
248 | ||
249 | hash_index = hash_lookup (hash_table, key, &hash_code); | |
250 | if (hash_index >= 0) | |
251 | { | |
252 | /* We have already registered the same composition. Change PROP | |
253 | from Form-A above to Form-B while replacing COMPONENTS with | |
254 | COMPONENTS-VEC stored in the hash table. We can directly | |
255 | modify the cons cell of PROP because it is not shared. */ | |
256 | key = HASH_KEY (hash_table, hash_index); | |
257 | id = HASH_VALUE (hash_table, hash_index); | |
f3fbd155 KR |
258 | XSETCAR (prop, id); |
259 | XSETCDR (prop, Fcons (make_number (nchars), Fcons (key, XCDR (prop)))); | |
ca4c9455 KH |
260 | return XINT (id); |
261 | } | |
262 | ||
263 | /* This composition is a new one. We must register it. */ | |
177c0ea7 | 264 | |
ca4c9455 KH |
265 | /* Check if we have sufficient memory to store this information. */ |
266 | if (composition_table_size == 0) | |
267 | { | |
268 | composition_table_size = 256; | |
269 | composition_table | |
270 | = (struct composition **) xmalloc (sizeof (composition_table[0]) | |
271 | * composition_table_size); | |
272 | } | |
273 | else if (composition_table_size <= n_compositions) | |
274 | { | |
275 | composition_table_size += 256; | |
276 | composition_table | |
277 | = (struct composition **) xrealloc (composition_table, | |
278 | sizeof (composition_table[0]) | |
279 | * composition_table_size); | |
280 | } | |
281 | ||
282 | key_contents = XVECTOR (key)->contents; | |
283 | ||
284 | /* Check if the contents of COMPONENTS are valid if COMPONENTS is a | |
285 | vector or a list. It should be a sequence of: | |
286 | char1 rule1 char2 rule2 char3 ... ruleN charN+1 */ | |
f30d8d94 | 287 | |
dd5e1ed4 | 288 | if (VECTORP (components) |
f30d8d94 KH |
289 | && ASIZE (components) >= 2 |
290 | && VECTORP (AREF (components, 0))) | |
291 | { | |
292 | /* COMPONENTS is a glyph-string. */ | |
293 | int len = ASIZE (key); | |
294 | ||
295 | for (i = 1; i < len; i++) | |
296 | if (! VECTORP (AREF (key, i))) | |
297 | goto invalid_composition; | |
298 | } | |
dd5e1ed4 | 299 | else if (VECTORP (components) || CONSP (components)) |
ca4c9455 KH |
300 | { |
301 | int len = XVECTOR (key)->size; | |
302 | ||
303 | /* The number of elements should be odd. */ | |
304 | if ((len % 2) == 0) | |
305 | goto invalid_composition; | |
306 | /* All elements should be integers (character or encoded | |
307 | composition rule). */ | |
308 | for (i = 0; i < len; i++) | |
309 | { | |
310 | if (!INTEGERP (key_contents[i])) | |
311 | goto invalid_composition; | |
312 | } | |
313 | } | |
314 | ||
315 | /* Change PROP from Form-A above to Form-B. We can directly modify | |
316 | the cons cell of PROP because it is not shared. */ | |
317 | XSETFASTINT (id, n_compositions); | |
f3fbd155 KR |
318 | XSETCAR (prop, id); |
319 | XSETCDR (prop, Fcons (make_number (nchars), Fcons (key, XCDR (prop)))); | |
ca4c9455 KH |
320 | |
321 | /* Register the composition in composition_hash_table. */ | |
322 | hash_index = hash_put (hash_table, key, id, hash_code); | |
323 | ||
324 | /* Register the composition in composition_table. */ | |
325 | cmp = (struct composition *) xmalloc (sizeof (struct composition)); | |
326 | ||
327 | cmp->method = (NILP (components) | |
328 | ? COMPOSITION_RELATIVE | |
329 | : ((INTEGERP (components) || STRINGP (components)) | |
330 | ? COMPOSITION_WITH_ALTCHARS | |
331 | : COMPOSITION_WITH_RULE_ALTCHARS)); | |
332 | cmp->hash_index = hash_index; | |
333 | glyph_len = (cmp->method == COMPOSITION_WITH_RULE_ALTCHARS | |
334 | ? (XVECTOR (key)->size + 1) / 2 | |
335 | : XVECTOR (key)->size); | |
336 | cmp->glyph_len = glyph_len; | |
337 | cmp->offsets = (short *) xmalloc (sizeof (short) * glyph_len * 2); | |
338 | cmp->font = NULL; | |
339 | ||
58753d74 | 340 | if (cmp->method != COMPOSITION_WITH_RULE_ALTCHARS) |
ca4c9455 KH |
341 | { |
342 | /* Relative composition. */ | |
343 | cmp->width = 0; | |
344 | for (i = 0; i < glyph_len; i++) | |
345 | { | |
346 | int this_width; | |
347 | ch = XINT (key_contents[i]); | |
8e86803c | 348 | this_width = (ch == '\t' ? 1 : CHAR_WIDTH (ch)); |
ca4c9455 KH |
349 | if (cmp->width < this_width) |
350 | cmp->width = this_width; | |
351 | } | |
352 | } | |
353 | else | |
354 | { | |
355 | /* Rule-base composition. */ | |
356 | float leftmost = 0.0, rightmost; | |
357 | ||
358 | ch = XINT (key_contents[0]); | |
69df789a | 359 | rightmost = ch != '\t' ? CHAR_WIDTH (ch) : 1; |
ca4c9455 KH |
360 | |
361 | for (i = 1; i < glyph_len; i += 2) | |
362 | { | |
464f8566 | 363 | int rule, gref, nref, xoff, yoff; |
ca4c9455 KH |
364 | int this_width; |
365 | float this_left; | |
366 | ||
367 | rule = XINT (key_contents[i]); | |
368 | ch = XINT (key_contents[i + 1]); | |
69df789a | 369 | this_width = ch != '\t' ? CHAR_WIDTH (ch) : 1; |
ca4c9455 KH |
370 | |
371 | /* A composition rule is specified by an integer value | |
372 | that encodes global and new reference points (GREF and | |
373 | NREF). GREF and NREF are specified by numbers as | |
374 | below: | |
375 | 0---1---2 -- ascent | |
376 | | | | |
377 | | | | |
378 | | | | |
379 | 9--10--11 -- center | |
380 | | | | |
381 | ---3---4---5--- baseline | |
382 | | | | |
383 | 6---7---8 -- descent | |
384 | */ | |
464f8566 | 385 | COMPOSITION_DECODE_RULE (rule, gref, nref, xoff, yoff); |
ca4c9455 KH |
386 | this_left = (leftmost |
387 | + (gref % 3) * (rightmost - leftmost) / 2.0 | |
388 | - (nref % 3) * this_width / 2.0); | |
389 | ||
390 | if (this_left < leftmost) | |
391 | leftmost = this_left; | |
392 | if (this_left + this_width > rightmost) | |
393 | rightmost = this_left + this_width; | |
394 | } | |
395 | ||
396 | cmp->width = rightmost - leftmost; | |
397 | if (cmp->width < (rightmost - leftmost)) | |
398 | /* To get a ceiling integer value. */ | |
399 | cmp->width++; | |
400 | } | |
401 | ||
402 | composition_table[n_compositions] = cmp; | |
403 | ||
404 | return n_compositions++; | |
405 | ||
406 | invalid_composition: | |
407 | /* Would it be better to remove this `composition' property? */ | |
408 | return -1; | |
409 | } | |
410 | ||
411 | \f | |
90b3fe91 KH |
412 | /* Find a static composition at or nearest to position POS of OBJECT |
413 | (buffer or string). | |
ca4c9455 KH |
414 | |
415 | OBJECT defaults to the current buffer. If there's a composition at | |
416 | POS, set *START and *END to the start and end of the sequence, | |
417 | *PROP to the `composition' property, and return 1. | |
418 | ||
419 | If there's no composition at POS and LIMIT is negative, return 0. | |
420 | ||
421 | Otherwise, search for a composition forward (LIMIT > POS) or | |
422 | backward (LIMIT < POS). In this case, LIMIT bounds the search. | |
423 | ||
424 | If a composition is found, set *START, *END, and *PROP as above, | |
425 | and return 1, else return 0. | |
426 | ||
427 | This doesn't check the validity of composition. */ | |
428 | ||
429 | int | |
430 | find_composition (pos, limit, start, end, prop, object) | |
aaefca97 DL |
431 | int pos, limit; |
432 | EMACS_INT *start, *end; | |
ca4c9455 KH |
433 | Lisp_Object *prop, object; |
434 | { | |
435 | Lisp_Object val; | |
436 | ||
437 | if (get_property_and_range (pos, Qcomposition, prop, start, end, object)) | |
438 | return 1; | |
439 | ||
440 | if (limit < 0 || limit == pos) | |
441 | return 0; | |
442 | ||
443 | if (limit > pos) /* search forward */ | |
d279f620 KH |
444 | { |
445 | val = Fnext_single_property_change (make_number (pos), Qcomposition, | |
446 | object, make_number (limit)); | |
447 | pos = XINT (val); | |
448 | if (pos == limit) | |
449 | return 0; | |
450 | } | |
ca4c9455 | 451 | else /* search backward */ |
d279f620 KH |
452 | { |
453 | if (get_property_and_range (pos - 1, Qcomposition, prop, start, end, | |
454 | object)) | |
455 | return 1; | |
456 | val = Fprevious_single_property_change (make_number (pos), Qcomposition, | |
457 | object, make_number (limit)); | |
458 | pos = XINT (val); | |
459 | if (pos == limit) | |
460 | return 0; | |
461 | pos--; | |
462 | } | |
ca4c9455 KH |
463 | get_property_and_range (pos, Qcomposition, prop, start, end, object); |
464 | return 1; | |
465 | } | |
466 | ||
467 | /* Run a proper function to adjust the composition sitting between | |
468 | FROM and TO with property PROP. */ | |
469 | ||
470 | static void | |
471 | run_composition_function (from, to, prop) | |
472 | int from, to; | |
473 | Lisp_Object prop; | |
474 | { | |
7d019510 | 475 | Lisp_Object func; |
aaefca97 | 476 | EMACS_INT start, end; |
ca4c9455 KH |
477 | |
478 | func = COMPOSITION_MODIFICATION_FUNC (prop); | |
479 | /* If an invalid composition precedes or follows, try to make them | |
480 | valid too. */ | |
481 | if (from > BEGV | |
482 | && find_composition (from - 1, -1, &start, &end, &prop, Qnil) | |
483 | && !COMPOSITION_VALID_P (start, end, prop)) | |
484 | from = start; | |
485 | if (to < ZV | |
486 | && find_composition (to, -1, &start, &end, &prop, Qnil) | |
487 | && !COMPOSITION_VALID_P (start, end, prop)) | |
488 | to = end; | |
775b3d2d | 489 | if (!NILP (Ffboundp (func))) |
ca4c9455 | 490 | call2 (func, make_number (from), make_number (to)); |
ca4c9455 KH |
491 | } |
492 | ||
493 | /* Make invalid compositions adjacent to or inside FROM and TO valid. | |
494 | CHECK_MASK is bitwise `or' of mask bits defined by macros | |
495 | CHECK_XXX (see the comment in composite.h). | |
496 | ||
b418f8a6 | 497 | It also resets the text-property `auto-composed' to a proper region |
f96ba4c1 KH |
498 | so that automatic character composition works correctly later while |
499 | displaying the region. | |
8f924df7 | 500 | |
ca4c9455 KH |
501 | This function is called when a buffer text is changed. If the |
502 | change is deletion, FROM == TO. Otherwise, FROM < TO. */ | |
503 | ||
504 | void | |
505 | update_compositions (from, to, check_mask) | |
aaefca97 DL |
506 | EMACS_INT from, to; |
507 | int check_mask; | |
ca4c9455 | 508 | { |
7d019510 | 509 | Lisp_Object prop; |
aaefca97 | 510 | EMACS_INT start, end; |
f96ba4c1 KH |
511 | /* The beginning and end of the region to set the property |
512 | `auto-composed' to nil. */ | |
aaefca97 | 513 | EMACS_INT min_pos = from, max_pos = to; |
ca4c9455 | 514 | |
6c1aa7f1 GM |
515 | if (inhibit_modification_hooks) |
516 | return; | |
177c0ea7 | 517 | |
d3f40cbd KH |
518 | /* If FROM and TO are not in a valid range, do nothing. */ |
519 | if (! (BEGV <= from && from <= to && to <= ZV)) | |
520 | return; | |
521 | ||
ca4c9455 KH |
522 | if (check_mask & CHECK_HEAD) |
523 | { | |
524 | /* FROM should be at composition boundary. But, insertion or | |
525 | deletion will make two compositions adjacent and | |
526 | indistinguishable when they have same (eq) property. To | |
527 | avoid it, in such a case, we change the property of the | |
528 | latter to the copy of it. */ | |
529 | if (from > BEGV | |
553d3164 KH |
530 | && find_composition (from - 1, -1, &start, &end, &prop, Qnil) |
531 | && COMPOSITION_VALID_P (start, end, prop)) | |
ca4c9455 | 532 | { |
f96ba4c1 KH |
533 | min_pos = start; |
534 | if (end > to) | |
535 | max_pos = end; | |
ca4c9455 KH |
536 | if (from < end) |
537 | Fput_text_property (make_number (from), make_number (end), | |
538 | Qcomposition, | |
539 | Fcons (XCAR (prop), XCDR (prop)), Qnil); | |
540 | run_composition_function (start, end, prop); | |
541 | from = end; | |
542 | } | |
dd33cc56 | 543 | else if (from < ZV |
553d3164 | 544 | && find_composition (from, -1, &start, &from, &prop, Qnil) |
9657d668 | 545 | && COMPOSITION_VALID_P (start, from, prop)) |
f96ba4c1 KH |
546 | { |
547 | if (from > to) | |
548 | max_pos = from; | |
549 | run_composition_function (start, from, prop); | |
550 | } | |
ca4c9455 KH |
551 | } |
552 | ||
553 | if (check_mask & CHECK_INSIDE) | |
554 | { | |
555 | /* In this case, we are sure that (check & CHECK_TAIL) is also | |
556 | nonzero. Thus, here we should check only compositions before | |
557 | (to - 1). */ | |
558 | while (from < to - 1 | |
559 | && find_composition (from, to, &start, &from, &prop, Qnil) | |
9657d668 | 560 | && COMPOSITION_VALID_P (start, from, prop) |
ca4c9455 KH |
561 | && from < to - 1) |
562 | run_composition_function (start, from, prop); | |
563 | } | |
564 | ||
565 | if (check_mask & CHECK_TAIL) | |
566 | { | |
567 | if (from < to | |
553d3164 KH |
568 | && find_composition (to - 1, -1, &start, &end, &prop, Qnil) |
569 | && COMPOSITION_VALID_P (start, end, prop)) | |
ca4c9455 KH |
570 | { |
571 | /* TO should be also at composition boundary. But, | |
572 | insertion or deletion will make two compositions adjacent | |
573 | and indistinguishable when they have same (eq) property. | |
574 | To avoid it, in such a case, we change the property of | |
575 | the former to the copy of it. */ | |
576 | if (to < end) | |
f96ba4c1 KH |
577 | { |
578 | Fput_text_property (make_number (start), make_number (to), | |
579 | Qcomposition, | |
580 | Fcons (XCAR (prop), XCDR (prop)), Qnil); | |
581 | max_pos = end; | |
582 | } | |
ca4c9455 KH |
583 | run_composition_function (start, end, prop); |
584 | } | |
585 | else if (to < ZV | |
553d3164 KH |
586 | && find_composition (to, -1, &start, &end, &prop, Qnil) |
587 | && COMPOSITION_VALID_P (start, end, prop)) | |
f96ba4c1 KH |
588 | { |
589 | run_composition_function (start, end, prop); | |
590 | max_pos = end; | |
591 | } | |
ca4c9455 | 592 | } |
f96ba4c1 | 593 | if (min_pos < max_pos) |
9d440521 KH |
594 | { |
595 | int count = SPECPDL_INDEX (); | |
596 | ||
597 | specbind (Qinhibit_read_only, Qt); | |
598 | specbind (Qinhibit_modification_hooks, Qt); | |
599 | specbind (Qinhibit_point_motion_hooks, Qt); | |
600 | Fremove_list_of_text_properties (make_number (min_pos), | |
601 | make_number (max_pos), | |
602 | Fcons (Qauto_composed, Qnil), Qnil); | |
603 | unbind_to (count, Qnil); | |
604 | } | |
ca4c9455 KH |
605 | } |
606 | ||
c1361885 KH |
607 | |
608 | /* Modify composition property values in LIST destructively. LIST is | |
609 | a list as returned from text_property_list. Change values to the | |
610 | top-level copies of them so that none of them are `eq'. */ | |
611 | ||
612 | void | |
613 | make_composition_value_copy (list) | |
614 | Lisp_Object list; | |
615 | { | |
616 | Lisp_Object plist, val; | |
617 | ||
618 | for (; CONSP (list); list = XCDR (list)) | |
619 | { | |
620 | plist = XCAR (XCDR (XCDR (XCAR (list)))); | |
621 | while (CONSP (plist) && CONSP (XCDR (plist))) | |
622 | { | |
623 | if (EQ (XCAR (plist), Qcomposition) | |
624 | && (val = XCAR (XCDR (plist)), CONSP (val))) | |
f3fbd155 | 625 | XSETCAR (XCDR (plist), Fcons (XCAR (val), XCDR (val))); |
c1361885 KH |
626 | plist = XCDR (XCDR (plist)); |
627 | } | |
628 | } | |
629 | } | |
630 | ||
631 | ||
ca4c9455 KH |
632 | /* Make text in the region between START and END a composition that |
633 | has COMPONENTS and MODIFICATION-FUNC. | |
634 | ||
635 | If STRING is non-nil, then operate on characters contained between | |
636 | indices START and END in STRING. */ | |
637 | ||
638 | void | |
639 | compose_text (start, end, components, modification_func, string) | |
640 | int start, end; | |
641 | Lisp_Object components, modification_func, string; | |
642 | { | |
643 | Lisp_Object prop; | |
644 | ||
645 | prop = Fcons (Fcons (make_number (end - start), components), | |
646 | modification_func); | |
647 | Fput_text_property (make_number (start), make_number (end), | |
648 | Qcomposition, prop, string); | |
649 | } | |
58753d74 KH |
650 | |
651 | ||
652 | static Lisp_Object autocmp_chars P_ ((Lisp_Object, EMACS_INT, EMACS_INT, | |
653 | EMACS_INT, struct window *, | |
654 | struct face *, Lisp_Object)); | |
655 | ||
656 | \f | |
657 | /* Lisp glyph-string handlers */ | |
658 | ||
659 | /* Hash table for automatic composition. The key is a header of a | |
660 | lgstring (Lispy glyph-string), and the value is a body of a | |
661 | lgstring. */ | |
662 | ||
663 | static Lisp_Object gstring_hash_table; | |
664 | ||
665 | static Lisp_Object gstring_lookup_cache P_ ((Lisp_Object)); | |
666 | ||
667 | static Lisp_Object | |
668 | gstring_lookup_cache (header) | |
669 | Lisp_Object header; | |
670 | { | |
671 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
672 | int i = hash_lookup (h, header, NULL); | |
673 | ||
674 | return (i >= 0 ? HASH_VALUE (h, i) : Qnil); | |
675 | } | |
676 | ||
677 | Lisp_Object | |
678 | composition_gstring_put_cache (gstring, len) | |
679 | Lisp_Object gstring; | |
680 | int len; | |
681 | { | |
682 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
683 | unsigned hash; | |
684 | Lisp_Object header, copy; | |
685 | int i; | |
686 | ||
687 | header = LGSTRING_HEADER (gstring); | |
688 | hash = h->hashfn (h, header); | |
689 | if (len < 0) | |
690 | { | |
691 | len = LGSTRING_GLYPH_LEN (gstring); | |
692 | for (i = 0; i < len; i++) | |
693 | if (NILP (LGSTRING_GLYPH (gstring, i))) | |
694 | break; | |
695 | len = i; | |
696 | } | |
087e2ea9 | 697 | |
58753d74 KH |
698 | copy = Fmake_vector (make_number (len + 2), Qnil); |
699 | LGSTRING_SET_HEADER (copy, Fcopy_sequence (header)); | |
700 | for (i = 0; i < len; i++) | |
701 | LGSTRING_SET_GLYPH (copy, i, Fcopy_sequence (LGSTRING_GLYPH (gstring, i))); | |
702 | i = hash_put (h, LGSTRING_HEADER (copy), copy, hash); | |
703 | LGSTRING_SET_ID (copy, make_number (i)); | |
704 | return copy; | |
705 | } | |
706 | ||
707 | Lisp_Object | |
708 | composition_gstring_from_id (id) | |
709 | int id; | |
710 | { | |
711 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
712 | ||
713 | return HASH_VALUE (h, id); | |
714 | } | |
715 | ||
716 | static Lisp_Object fill_gstring_header P_ ((Lisp_Object, Lisp_Object, | |
717 | Lisp_Object, Lisp_Object, | |
718 | Lisp_Object)); | |
719 | ||
720 | int | |
721 | composition_gstring_p (gstring) | |
722 | Lisp_Object gstring; | |
723 | { | |
724 | Lisp_Object header; | |
725 | int i; | |
726 | ||
727 | if (! VECTORP (gstring) || ASIZE (gstring) < 2) | |
728 | return 0; | |
729 | header = LGSTRING_HEADER (gstring); | |
730 | if (! VECTORP (header) || ASIZE (header) < 2) | |
731 | return 0; | |
732 | if (! NILP (LGSTRING_FONT (gstring)) | |
f5199465 KH |
733 | && (! FONT_OBJECT_P (LGSTRING_FONT (gstring)) |
734 | && ! CODING_SYSTEM_P (LGSTRING_FONT (gstring)))) | |
58753d74 KH |
735 | return 0; |
736 | for (i = 1; i < ASIZE (LGSTRING_HEADER (gstring)); i++) | |
737 | if (! NATNUMP (AREF (LGSTRING_HEADER (gstring), i))) | |
738 | return 0; | |
739 | if (! NILP (LGSTRING_ID (gstring)) && ! NATNUMP (LGSTRING_ID (gstring))) | |
740 | return 0; | |
741 | for (i = 0; i < LGSTRING_GLYPH_LEN (gstring); i++) | |
742 | { | |
743 | Lisp_Object glyph = LGSTRING_GLYPH (gstring, i); | |
744 | if (NILP (glyph)) | |
745 | break; | |
746 | if (! VECTORP (glyph) || ASIZE (glyph) != LGLYPH_SIZE) | |
747 | return 0; | |
748 | } | |
749 | return 1; | |
750 | } | |
751 | ||
752 | int | |
753 | composition_gstring_width (gstring, from, to, metrics) | |
754 | Lisp_Object gstring; | |
755 | int from, to; | |
756 | struct font_metrics *metrics; | |
757 | { | |
758 | Lisp_Object *glyph; | |
759 | int width = 0; | |
760 | ||
761 | if (metrics) | |
762 | { | |
763 | Lisp_Object font_object = LGSTRING_FONT (gstring); | |
58753d74 | 764 | |
f5199465 KH |
765 | if (FONT_OBJECT_P (font_object)) |
766 | { | |
767 | struct font *font = XFONT_OBJECT (font_object); | |
768 | ||
769 | metrics->ascent = font->ascent; | |
770 | metrics->descent = font->descent; | |
771 | } | |
772 | else | |
773 | { | |
774 | metrics->ascent = 1; | |
775 | metrics->descent = 0; | |
776 | } | |
58753d74 KH |
777 | metrics->width = metrics->lbearing = metrics->rbearing = 0; |
778 | } | |
779 | for (glyph = &LGSTRING_GLYPH (gstring, from); from < to; from++, glyph++) | |
780 | { | |
781 | int x; | |
782 | ||
783 | if (NILP (LGLYPH_ADJUSTMENT (*glyph))) | |
784 | width += LGLYPH_WIDTH (*glyph); | |
785 | else | |
786 | width += LGLYPH_WADJUST (*glyph); | |
787 | if (metrics) | |
788 | { | |
789 | x = metrics->width + LGLYPH_LBEARING (*glyph) + LGLYPH_XOFF (*glyph); | |
790 | if (metrics->lbearing > x) | |
791 | metrics->lbearing = x; | |
792 | x = metrics->width + LGLYPH_RBEARING (*glyph) + LGLYPH_XOFF (*glyph); | |
793 | if (metrics->rbearing < x) | |
794 | metrics->rbearing = x; | |
795 | metrics->width = width; | |
796 | x = LGLYPH_ASCENT (*glyph) - LGLYPH_YOFF (*glyph); | |
797 | if (metrics->ascent < x) | |
798 | metrics->ascent = x; | |
895416e3 | 799 | x = LGLYPH_DESCENT (*glyph) + LGLYPH_YOFF (*glyph); |
58753d74 KH |
800 | if (metrics->descent < x) |
801 | metrics->descent = x; | |
802 | } | |
803 | } | |
804 | return width; | |
805 | } | |
806 | ||
807 | ||
808 | static Lisp_Object gstring_work; | |
809 | static Lisp_Object gstring_work_headers; | |
810 | ||
811 | static Lisp_Object | |
812 | fill_gstring_header (header, start, end, font_object, string) | |
813 | Lisp_Object header, start, end, font_object, string; | |
814 | { | |
815 | EMACS_INT from, to, from_byte; | |
816 | EMACS_INT len, i; | |
817 | ||
818 | if (NILP (string)) | |
819 | { | |
820 | if (NILP (current_buffer->enable_multibyte_characters)) | |
821 | error ("Attempt to shape unibyte text"); | |
822 | validate_region (&start, &end); | |
823 | from = XFASTINT (start); | |
824 | to = XFASTINT (end); | |
825 | from_byte = CHAR_TO_BYTE (from); | |
826 | } | |
827 | else | |
828 | { | |
829 | CHECK_STRING (string); | |
793ffee8 | 830 | if (! STRING_MULTIBYTE (string)) |
58753d74 | 831 | error ("Attempt to shape unibyte text"); |
ea8ba975 | 832 | /* FROM and TO are checked by the caller. */ |
58753d74 | 833 | from = XINT (start); |
58753d74 KH |
834 | to = XINT (end); |
835 | if (from < 0 || from > to || to > SCHARS (string)) | |
836 | args_out_of_range_3 (string, start, end); | |
837 | from_byte = string_char_to_byte (string, from); | |
838 | } | |
839 | ||
840 | len = to - from; | |
841 | if (len == 0) | |
842 | error ("Attempt to shape zero-length text"); | |
843 | if (VECTORP (header)) | |
844 | { | |
845 | if (ASIZE (header) != len + 1) | |
846 | args_out_of_range (header, make_number (len + 1)); | |
847 | } | |
848 | else | |
849 | { | |
850 | if (len <= 8) | |
851 | header = AREF (gstring_work_headers, len - 1); | |
852 | else | |
853 | header = Fmake_vector (make_number (len + 1), Qnil); | |
854 | } | |
855 | ||
856 | ASET (header, 0, font_object); | |
857 | for (i = 0; i < len; i++) | |
858 | { | |
859 | int c; | |
860 | ||
861 | if (NILP (string)) | |
862 | FETCH_CHAR_ADVANCE_NO_CHECK (c, from, from_byte); | |
863 | else | |
864 | FETCH_STRING_CHAR_ADVANCE_NO_CHECK (c, string, from, from_byte); | |
865 | ASET (header, i + 1, make_number (c)); | |
866 | } | |
867 | return header; | |
868 | } | |
869 | ||
870 | extern void font_fill_lglyph_metrics P_ ((Lisp_Object, Lisp_Object)); | |
871 | ||
872 | static void | |
873 | fill_gstring_body (gstring) | |
874 | Lisp_Object gstring; | |
875 | { | |
876 | Lisp_Object font_object = LGSTRING_FONT (gstring); | |
877 | Lisp_Object header = AREF (gstring, 0); | |
878 | EMACS_INT len = LGSTRING_CHAR_LEN (gstring); | |
879 | EMACS_INT i; | |
880 | ||
881 | for (i = 0; i < len; i++) | |
882 | { | |
883 | Lisp_Object g = LGSTRING_GLYPH (gstring, i); | |
77fa4db2 | 884 | EMACS_INT c = XINT (AREF (header, i + 1)); |
58753d74 KH |
885 | |
886 | if (NILP (g)) | |
887 | { | |
888 | g = LGLYPH_NEW (); | |
889 | LGSTRING_SET_GLYPH (gstring, i, g); | |
890 | } | |
891 | LGLYPH_SET_FROM (g, i); | |
892 | LGLYPH_SET_TO (g, i); | |
893 | LGLYPH_SET_CHAR (g, c); | |
f5199465 | 894 | if (FONT_OBJECT_P (font_object)) |
58753d74 KH |
895 | { |
896 | font_fill_lglyph_metrics (g, font_object); | |
897 | } | |
898 | else | |
899 | { | |
900 | int width = XFASTINT (CHAR_TABLE_REF (Vchar_width_table, c)); | |
901 | ||
902 | LGLYPH_SET_CODE (g, c); | |
903 | LGLYPH_SET_LBEARING (g, 0); | |
904 | LGLYPH_SET_RBEARING (g, width); | |
905 | LGLYPH_SET_WIDTH (g, width); | |
906 | LGLYPH_SET_ASCENT (g, 1); | |
907 | LGLYPH_SET_DESCENT (g, 0); | |
908 | } | |
909 | LGLYPH_SET_ADJUSTMENT (g, Qnil); | |
910 | } | |
911 | if (i < LGSTRING_GLYPH_LEN (gstring)) | |
912 | LGSTRING_SET_GLYPH (gstring, i, Qnil); | |
913 | } | |
914 | ||
58753d74 KH |
915 | |
916 | /* Try to compose the characters at CHARPOS according to CFT_ELEMENT | |
087e2ea9 | 917 | which is an element of composition-function-table (which see). |
58753d74 KH |
918 | LIMIT limits the characters to compose. STRING, if not nil, is a |
919 | target string. WIN is a window where the characters are being | |
920 | displayed. */ | |
921 | ||
922 | static Lisp_Object | |
923 | autocmp_chars (cft_element, charpos, bytepos, limit, win, face, string) | |
924 | Lisp_Object cft_element; | |
925 | EMACS_INT charpos, bytepos, limit; | |
926 | struct window *win; | |
927 | struct face *face; | |
928 | Lisp_Object string; | |
929 | { | |
930 | int count = SPECPDL_INDEX (); | |
931 | FRAME_PTR f = XFRAME (win->frame); | |
932 | Lisp_Object pos = make_number (charpos); | |
933 | EMACS_INT pt = PT, pt_byte = PT_BYTE; | |
90b3fe91 | 934 | int lookback; |
087e2ea9 | 935 | |
58753d74 | 936 | record_unwind_save_match_data (); |
90b3fe91 | 937 | for (lookback = -1; CONSP (cft_element); cft_element = XCDR (cft_element)) |
58753d74 KH |
938 | { |
939 | Lisp_Object elt = XCAR (cft_element); | |
940 | Lisp_Object re; | |
941 | Lisp_Object font_object = Qnil, gstring; | |
895416e3 | 942 | EMACS_INT len, to; |
58753d74 KH |
943 | |
944 | if (! VECTORP (elt) || ASIZE (elt) != 3) | |
945 | continue; | |
90b3fe91 | 946 | if (lookback < 0) |
895416e3 KH |
947 | { |
948 | lookback = XFASTINT (AREF (elt, 1)); | |
949 | if (limit > charpos + MAX_COMPOSITION_COMPONENTS) | |
950 | limit = charpos + MAX_COMPOSITION_COMPONENTS; | |
951 | } | |
90b3fe91 KH |
952 | else if (lookback != XFASTINT (AREF (elt, 1))) |
953 | break; | |
58753d74 | 954 | re = AREF (elt, 0); |
895416e3 KH |
955 | if (NILP (re)) |
956 | len = 1; | |
957 | else if ((len = fast_looking_at (re, charpos, bytepos, limit, -1, string)) | |
958 | > 0) | |
58753d74 | 959 | { |
895416e3 KH |
960 | if (NILP (string)) |
961 | len = BYTE_TO_CHAR (bytepos + len) - charpos; | |
962 | else | |
963 | len = string_byte_to_char (string, bytepos + len) - charpos; | |
964 | } | |
965 | if (len > 0) | |
966 | { | |
967 | limit = to = charpos + len; | |
58753d74 KH |
968 | #ifdef HAVE_WINDOW_SYSTEM |
969 | if (FRAME_WINDOW_P (f)) | |
970 | { | |
971 | font_object = font_range (charpos, &to, win, face, string); | |
895416e3 KH |
972 | if (! FONT_OBJECT_P (font_object) |
973 | || (! NILP (re) | |
974 | && to < limit | |
975 | && (fast_looking_at (re, charpos, bytepos, to, -1, string) <= 0))) | |
58753d74 KH |
976 | { |
977 | if (NILP (string)) | |
978 | TEMP_SET_PT_BOTH (pt, pt_byte); | |
979 | return unbind_to (count, Qnil); | |
980 | } | |
981 | } | |
f5199465 | 982 | else |
58753d74 | 983 | #endif /* not HAVE_WINDOW_SYSTEM */ |
f5199465 | 984 | font_object = win->frame; |
58753d74 KH |
985 | gstring = Fcomposition_get_gstring (pos, make_number (to), |
986 | font_object, string); | |
987 | if (NILP (LGSTRING_ID (gstring))) | |
988 | { | |
989 | Lisp_Object args[6]; | |
990 | ||
991 | args[0] = Vauto_composition_function; | |
992 | args[1] = AREF (elt, 2); | |
993 | args[2] = pos; | |
994 | args[3] = make_number (to); | |
995 | args[4] = font_object; | |
996 | args[5] = string; | |
997 | gstring = safe_call (6, args); | |
998 | } | |
999 | if (NILP (string)) | |
1000 | TEMP_SET_PT_BOTH (pt, pt_byte); | |
1001 | return unbind_to (count, gstring); | |
1002 | } | |
1003 | } | |
1004 | if (NILP (string)) | |
1005 | TEMP_SET_PT_BOTH (pt, pt_byte); | |
1006 | return unbind_to (count, Qnil); | |
1007 | } | |
1008 | ||
1009 | ||
1010 | /* Update cmp_it->stop_pos to the next position after CHARPOS (and | |
1011 | BYTEPOS) where character composition may happen. If BYTEPOS is | |
1012 | negative, compoute it. If it is a static composition, set | |
1013 | cmp_it->ch to -1. Otherwise, set cmp_it->ch to the character that | |
1014 | triggers a automatic composition. */ | |
1015 | ||
1016 | void | |
1017 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string) | |
1018 | struct composition_it *cmp_it; | |
1019 | EMACS_INT charpos, bytepos, endpos; | |
1020 | Lisp_Object string; | |
1021 | { | |
1022 | EMACS_INT start, end, c; | |
1023 | Lisp_Object prop, val; | |
3ffdafce KH |
1024 | /* This is from forward_to_next_line_start in xdisp.c. */ |
1025 | const int MAX_NEWLINE_DISTANCE = 500; | |
58753d74 | 1026 | |
3ffdafce KH |
1027 | if (endpos > charpos + MAX_NEWLINE_DISTANCE) |
1028 | endpos = charpos + MAX_NEWLINE_DISTANCE; | |
58753d74 | 1029 | cmp_it->stop_pos = endpos; |
053ca52b | 1030 | cmp_it->id = -1; |
44566dc7 | 1031 | cmp_it->ch = -2; |
58753d74 KH |
1032 | if (find_composition (charpos, endpos, &start, &end, &prop, string) |
1033 | && COMPOSITION_VALID_P (start, end, prop)) | |
1034 | { | |
1035 | cmp_it->stop_pos = endpos = start; | |
1036 | cmp_it->ch = -1; | |
1037 | } | |
f5199465 KH |
1038 | if (NILP (string) && PT > charpos && PT < endpos) |
1039 | cmp_it->stop_pos = PT; | |
58753d74 KH |
1040 | if (NILP (current_buffer->enable_multibyte_characters) |
1041 | || ! FUNCTIONP (Vauto_composition_function)) | |
1042 | return; | |
1043 | if (bytepos < 0) | |
1044 | { | |
1045 | if (STRINGP (string)) | |
1046 | bytepos = string_char_to_byte (string, charpos); | |
1047 | else | |
1048 | bytepos = CHAR_TO_BYTE (charpos); | |
1049 | } | |
1050 | ||
1051 | start = charpos; | |
1052 | while (charpos < endpos) | |
1053 | { | |
1054 | if (STRINGP (string)) | |
1055 | FETCH_STRING_CHAR_ADVANCE (c, string, charpos, bytepos); | |
1056 | else | |
1057 | FETCH_CHAR_ADVANCE (c, charpos, bytepos); | |
3ffdafce | 1058 | if (c == '\n') |
ea8ba975 KH |
1059 | { |
1060 | cmp_it->ch = -2; | |
1061 | break; | |
1062 | } | |
58753d74 KH |
1063 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); |
1064 | if (! NILP (val)) | |
1065 | { | |
1066 | Lisp_Object elt; | |
1067 | ||
1068 | for (; CONSP (val); val = XCDR (val)) | |
1069 | { | |
1070 | elt = XCAR (val); | |
1071 | if (VECTORP (elt) && ASIZE (elt) == 3 && NATNUMP (AREF (elt, 1)) | |
1072 | && charpos - 1 - XFASTINT (AREF (elt, 1)) >= start) | |
1073 | break; | |
1074 | } | |
1075 | if (CONSP (val)) | |
1076 | { | |
90b3fe91 KH |
1077 | cmp_it->lookback = XFASTINT (AREF (elt, 1)); |
1078 | cmp_it->stop_pos = charpos - 1 - cmp_it->lookback; | |
58753d74 | 1079 | cmp_it->ch = c; |
44566dc7 | 1080 | return; |
58753d74 KH |
1081 | } |
1082 | } | |
1083 | } | |
44566dc7 | 1084 | cmp_it->stop_pos = charpos; |
58753d74 KH |
1085 | } |
1086 | ||
1087 | /* Check if the character at CHARPOS (and BYTEPOS) is composed | |
22e33406 | 1088 | (possibly with the following characters) on window W. ENDPOS limits |
58753d74 KH |
1089 | characters to be composed. FACE, in non-NULL, is a base face of |
1090 | the character. If STRING is not nil, it is a string containing the | |
1091 | character to check, and CHARPOS and BYTEPOS are indices in the | |
1092 | string. In that case, FACE must not be NULL. | |
1093 | ||
1094 | If the character is composed, setup members of CMP_IT (id, nglyphs, | |
1095 | and from), and return 1. Otherwise, update CMP_IT->stop_pos, and | |
1096 | return 0. */ | |
1097 | ||
1098 | int | |
1099 | composition_reseat_it (cmp_it, charpos, bytepos, endpos, w, face, string) | |
1100 | struct composition_it *cmp_it; | |
1101 | EMACS_INT charpos, bytepos, endpos; | |
1102 | struct window *w; | |
1103 | struct face *face; | |
1104 | Lisp_Object string; | |
1105 | { | |
3ffdafce KH |
1106 | if (cmp_it->ch == -2) |
1107 | { | |
1108 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string); | |
1109 | if (cmp_it->ch == -2) | |
1110 | return 0; | |
1111 | } | |
1112 | ||
58753d74 KH |
1113 | if (cmp_it->ch < 0) |
1114 | { | |
1115 | /* We are looking at a static composition. */ | |
1116 | EMACS_INT start, end; | |
1117 | Lisp_Object prop; | |
1118 | ||
1119 | find_composition (charpos, -1, &start, &end, &prop, string); | |
1120 | cmp_it->id = get_composition_id (charpos, bytepos, end - start, | |
1121 | prop, string); | |
1122 | if (cmp_it->id < 0) | |
1123 | goto no_composition; | |
1124 | cmp_it->nchars = end - start; | |
1125 | cmp_it->nglyphs = composition_table[cmp_it->id]->glyph_len; | |
1126 | } | |
29fb7306 | 1127 | else if (w) |
58753d74 | 1128 | { |
90b3fe91 | 1129 | Lisp_Object val, elt; |
58753d74 KH |
1130 | int i; |
1131 | ||
1132 | val = CHAR_TABLE_REF (Vcomposition_function_table, cmp_it->ch); | |
90b3fe91 KH |
1133 | for (; CONSP (val); val = XCDR (val)) |
1134 | { | |
1135 | elt = XCAR (val); | |
1136 | if (cmp_it->lookback == XFASTINT (AREF (elt, 1))) | |
1137 | break; | |
1138 | } | |
58753d74 KH |
1139 | if (NILP (val)) |
1140 | goto no_composition; | |
90b3fe91 | 1141 | |
58753d74 KH |
1142 | val = autocmp_chars (val, charpos, bytepos, endpos, w, face, string); |
1143 | if (! composition_gstring_p (val)) | |
1144 | goto no_composition; | |
1145 | if (NILP (LGSTRING_ID (val))) | |
1146 | val = composition_gstring_put_cache (val, -1); | |
1147 | cmp_it->id = XINT (LGSTRING_ID (val)); | |
1148 | for (i = 0; i < LGSTRING_GLYPH_LEN (val); i++) | |
1149 | if (NILP (LGSTRING_GLYPH (val, i))) | |
1150 | break; | |
1151 | cmp_it->nglyphs = i; | |
1152 | } | |
29fb7306 KH |
1153 | else |
1154 | goto no_composition; | |
58753d74 KH |
1155 | cmp_it->from = 0; |
1156 | return 1; | |
1157 | ||
1158 | no_composition: | |
1159 | charpos++; | |
1160 | if (STRINGP (string)) | |
1161 | bytepos += MULTIBYTE_LENGTH_NO_CHECK (SDATA (string) + bytepos); | |
1162 | else | |
1163 | INC_POS (bytepos); | |
1164 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string); | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | int | |
1169 | composition_update_it (cmp_it, charpos, bytepos, string) | |
1170 | struct composition_it *cmp_it; | |
1171 | EMACS_INT charpos, bytepos; | |
1172 | Lisp_Object string; | |
1173 | { | |
1174 | int i, c; | |
1175 | ||
1176 | if (cmp_it->ch < 0) | |
1177 | { | |
1178 | struct composition *cmp = composition_table[cmp_it->id]; | |
1179 | ||
1180 | cmp_it->to = cmp_it->nglyphs; | |
1181 | if (cmp_it->nglyphs == 0) | |
1182 | c = -1; | |
1183 | else | |
1184 | { | |
1185 | for (i = 0; i < cmp->glyph_len; i++) | |
1186 | if ((c = COMPOSITION_GLYPH (cmp, i)) != '\t') | |
1187 | break; | |
1188 | if (c == '\t') | |
1189 | c = ' '; | |
1190 | } | |
1191 | cmp_it->width = cmp->width; | |
1192 | } | |
1193 | else | |
1194 | { | |
1195 | Lisp_Object gstring = composition_gstring_from_id (cmp_it->id); | |
1196 | ||
1197 | if (cmp_it->nglyphs == 0) | |
1198 | { | |
1199 | c = -1; | |
1200 | cmp_it->nchars = LGSTRING_CHAR_LEN (gstring); | |
1201 | cmp_it->width = 0; | |
1202 | } | |
1203 | else | |
1204 | { | |
1205 | Lisp_Object glyph = LGSTRING_GLYPH (gstring, cmp_it->from); | |
1206 | int from = LGLYPH_FROM (glyph); | |
1207 | ||
c7c7a80c | 1208 | c = XINT (LGSTRING_CHAR (gstring, from)); |
58753d74 KH |
1209 | cmp_it->nchars = LGLYPH_TO (glyph) - from + 1; |
1210 | cmp_it->width = (LGLYPH_WIDTH (glyph) > 0 | |
1211 | ? CHAR_WIDTH (LGLYPH_CHAR (glyph)) : 0); | |
1212 | for (cmp_it->to = cmp_it->from + 1; cmp_it->to < cmp_it->nglyphs; | |
1213 | cmp_it->to++) | |
1214 | { | |
1215 | glyph = LGSTRING_GLYPH (gstring, cmp_it->to); | |
1216 | if (LGLYPH_FROM (glyph) != from) | |
1217 | break; | |
1218 | if (LGLYPH_WIDTH (glyph) > 0) | |
1219 | cmp_it->width += CHAR_WIDTH (LGLYPH_CHAR (glyph)); | |
1220 | } | |
1221 | } | |
1222 | } | |
1223 | ||
1224 | charpos += cmp_it->nchars; | |
1225 | if (STRINGP (string)) | |
1226 | cmp_it->nbytes = string_char_to_byte (string, charpos) - bytepos; | |
1227 | else | |
1228 | cmp_it->nbytes = CHAR_TO_BYTE (charpos) - bytepos; | |
1229 | return c; | |
1230 | } | |
1231 | ||
1232 | ||
90b3fe91 KH |
1233 | struct position_record |
1234 | { | |
1235 | EMACS_INT pos, pos_byte; | |
1236 | unsigned char *p; | |
1237 | }; | |
1238 | ||
1239 | /* Update the members of POSTION to the next character boundary. */ | |
1240 | #define FORWARD_CHAR(POSITION, STOP) \ | |
1241 | do { \ | |
90b3fe91 | 1242 | (POSITION).pos++; \ |
900c4486 KH |
1243 | if ((POSITION).pos == (STOP)) \ |
1244 | { \ | |
1245 | (POSITION).p = GAP_END_ADDR; \ | |
1246 | (POSITION).pos_byte = GPT_BYTE; \ | |
1247 | } \ | |
1248 | else \ | |
1249 | { \ | |
900c4486 | 1250 | (POSITION).pos_byte += BYTES_BY_CHAR_HEAD (*((POSITION).p)); \ |
d45a49e3 | 1251 | (POSITION).p += BYTES_BY_CHAR_HEAD (*((POSITION).p)); \ |
900c4486 | 1252 | } \ |
90b3fe91 KH |
1253 | } while (0) |
1254 | ||
1255 | /* Update the members of POSTION to the previous character boundary. */ | |
1256 | #define BACKWARD_CHAR(POSITION, STOP) \ | |
1257 | do { \ | |
1258 | if ((POSITION).pos == STOP) \ | |
1259 | (POSITION).p = GPT_ADDR; \ | |
1260 | do { \ | |
1261 | (POSITION).pos_byte--; \ | |
1262 | (POSITION).p--; \ | |
1263 | } while (! CHAR_HEAD_P (*((POSITION).p))); \ | |
1264 | (POSITION).pos--; \ | |
1265 | } while (0) | |
1266 | ||
1267 | static Lisp_Object _work_val; | |
1268 | static int _work_char; | |
1269 | ||
1270 | /* 1 iff the character C is composable. */ | |
1271 | #define CHAR_COMPOSABLE_P(C) \ | |
1272 | (_work_val = CHAR_TABLE_REF (Vunicode_category_table, (C)), \ | |
1273 | (SYMBOLP (_work_val) \ | |
1274 | && (_work_char = SDATA (SYMBOL_NAME (_work_val))[0]) != 'C' \ | |
1275 | && _work_char != 'Z')) | |
1276 | ||
1277 | /* This is like find_composition, but find an automatic composition | |
1278 | instead. If found, set *GSTRING to the glyph-string representing | |
1279 | the composition, and return 1. Otherwise, return 0. */ | |
1280 | ||
1281 | static int | |
1282 | find_automatic_composition (pos, limit, start, end, gstring, string) | |
1283 | EMACS_INT pos, limit, *start, *end; | |
1284 | Lisp_Object *gstring, string; | |
1285 | { | |
1286 | EMACS_INT head, tail, stop; | |
895416e3 KH |
1287 | /* Limit to check a composition after POS. */ |
1288 | EMACS_INT fore_check_limit; | |
90b3fe91 KH |
1289 | struct position_record orig, cur, check, prev; |
1290 | Lisp_Object check_val, val, elt; | |
1291 | int check_lookback; | |
1292 | int c; | |
29fb7306 | 1293 | Lisp_Object window; |
90b3fe91 KH |
1294 | struct window *w; |
1295 | ||
3eda4b19 | 1296 | window = Fget_buffer_window (Fcurrent_buffer (), Qnil); |
29fb7306 KH |
1297 | if (NILP (window)) |
1298 | return 0; | |
1299 | w = XWINDOW (window); | |
1300 | ||
90b3fe91 KH |
1301 | orig.pos = pos; |
1302 | if (NILP (string)) | |
1303 | { | |
1304 | head = BEGV, tail = ZV, stop = GPT; | |
1305 | orig.pos_byte = CHAR_TO_BYTE (orig.pos); | |
1306 | orig.p = BYTE_POS_ADDR (orig.pos_byte); | |
1307 | } | |
1308 | else | |
1309 | { | |
1310 | head = 0, tail = SCHARS (string), stop = -1; | |
1311 | orig.pos_byte = string_char_to_byte (string, orig.pos); | |
1312 | orig.p = SDATA (string) + orig.pos_byte; | |
1313 | } | |
1314 | if (limit < pos) | |
895416e3 | 1315 | fore_check_limit = min (tail, pos + MAX_AUTO_COMPOSITION_LOOKBACK); |
90b3fe91 | 1316 | else |
895416e3 | 1317 | fore_check_limit = min (tail, limit + MAX_AUTO_COMPOSITION_LOOKBACK); |
90b3fe91 KH |
1318 | cur = orig; |
1319 | ||
1320 | retry: | |
1321 | check_val = Qnil; | |
895416e3 | 1322 | /* At first, check if POS is composable. */ |
90b3fe91 KH |
1323 | c = STRING_CHAR (cur.p, 0); |
1324 | if (! CHAR_COMPOSABLE_P (c)) | |
1325 | { | |
1326 | if (limit < 0) | |
1327 | return 0; | |
1328 | if (limit >= cur.pos) | |
1329 | goto search_forward; | |
1330 | } | |
1331 | else | |
1332 | { | |
1333 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1334 | if (! NILP (val)) | |
1335 | check_val = val, check = cur; | |
1336 | else | |
895416e3 | 1337 | while (cur.pos + 1 < fore_check_limit) |
90b3fe91 | 1338 | { |
895416e3 KH |
1339 | EMACS_INT b, e; |
1340 | ||
90b3fe91 | 1341 | FORWARD_CHAR (cur, stop); |
895416e3 KH |
1342 | if (get_property_and_range (cur.pos, Qcomposition, &val, &b, &e, |
1343 | Qnil) | |
1344 | && COMPOSITION_VALID_P (b, e, val)) | |
1345 | { | |
1346 | fore_check_limit = cur.pos; | |
1347 | break; | |
1348 | } | |
90b3fe91 KH |
1349 | c = STRING_CHAR (cur.p, 0); |
1350 | if (! CHAR_COMPOSABLE_P (c)) | |
1351 | break; | |
1352 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1353 | if (NILP (val)) | |
1354 | continue; | |
1355 | check_val = val, check = cur; | |
1356 | break; | |
1357 | } | |
1358 | cur = orig; | |
1359 | } | |
1360 | /* Rewind back to the position where we can safely search forward | |
1361 | for compositions. */ | |
1362 | while (cur.pos > head) | |
1363 | { | |
895416e3 KH |
1364 | EMACS_INT b, e; |
1365 | ||
90b3fe91 | 1366 | BACKWARD_CHAR (cur, stop); |
895416e3 KH |
1367 | if (get_property_and_range (cur.pos, Qcomposition, &val, &b, &e, Qnil) |
1368 | && COMPOSITION_VALID_P (b, e, val)) | |
1369 | break; | |
90b3fe91 KH |
1370 | c = STRING_CHAR (cur.p, 0); |
1371 | if (! CHAR_COMPOSABLE_P (c)) | |
1372 | break; | |
1373 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1374 | if (! NILP (val)) | |
1375 | check_val = val, check = cur; | |
1376 | } | |
1377 | prev = cur; | |
1378 | /* Now search forward. */ | |
087e2ea9 | 1379 | search_forward: |
90b3fe91 KH |
1380 | *gstring = Qnil; |
1381 | if (! NILP (check_val) || limit >= orig.pos) | |
1382 | { | |
1383 | if (NILP (check_val)) | |
1384 | cur = orig; | |
1385 | else | |
1386 | cur = check; | |
895416e3 | 1387 | while (cur.pos < fore_check_limit) |
90b3fe91 KH |
1388 | { |
1389 | int need_adjustment = 0; | |
1390 | ||
1391 | if (NILP (check_val)) | |
1392 | { | |
1393 | c = STRING_CHAR (cur.p, 0); | |
1394 | check_val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1395 | } | |
1396 | for (; CONSP (check_val); check_val = XCDR (check_val)) | |
1397 | { | |
1398 | elt = XCAR (check_val); | |
1399 | if (VECTORP (elt) && ASIZE (elt) == 3 && NATNUMP (AREF (elt, 1)) | |
1400 | && cur.pos - XFASTINT (AREF (elt, 1)) >= head) | |
1401 | { | |
1402 | check.pos = cur.pos - XFASTINT (AREF (elt, 1)); | |
1403 | if (check.pos == cur.pos) | |
1404 | check.pos_byte = cur.pos_byte; | |
1405 | else | |
1406 | check.pos_byte = CHAR_TO_BYTE (check.pos); | |
1407 | val = autocmp_chars (check_val, check.pos, check.pos_byte, | |
1408 | tail, w, NULL, string); | |
1409 | need_adjustment = 1; | |
1410 | if (! NILP (val)) | |
1411 | { | |
1412 | *gstring = val; | |
1413 | *start = check.pos; | |
1414 | *end = check.pos + LGSTRING_CHAR_LEN (*gstring); | |
1415 | if (*start <= orig.pos ? *end > orig.pos | |
1416 | : limit >= orig.pos) | |
1417 | return 1; | |
1418 | cur.pos = *end; | |
1419 | cur.pos_byte = CHAR_TO_BYTE (cur.pos); | |
1420 | break; | |
1421 | } | |
1422 | } | |
1423 | } | |
1424 | if (need_adjustment) | |
1425 | { | |
1426 | /* As we have called Lisp, there's a possibilily that | |
1427 | buffer/string is relocated. */ | |
1428 | if (NILP (string)) | |
1429 | cur.p = BYTE_POS_ADDR (cur.pos_byte); | |
1430 | else | |
1431 | cur.p = SDATA (string) + cur.pos_byte; | |
1432 | } | |
1433 | if (! CONSP (check_val)) | |
1434 | FORWARD_CHAR (cur, stop); | |
1435 | check_val = Qnil; | |
1436 | } | |
1437 | } | |
1438 | if (! NILP (*gstring)) | |
1439 | return (limit >= 0 || (*start <= orig.pos && *end > orig.pos)); | |
1440 | if (limit >= 0 && limit < orig.pos && prev.pos > head) | |
1441 | { | |
1442 | cur = prev; | |
1443 | BACKWARD_CHAR (cur, stop); | |
1444 | orig = cur; | |
895416e3 | 1445 | fore_check_limit = orig.pos; |
90b3fe91 KH |
1446 | goto retry; |
1447 | } | |
1448 | return 0; | |
1449 | } | |
1450 | ||
58753d74 KH |
1451 | int |
1452 | composition_adjust_point (last_pt) | |
1453 | EMACS_INT last_pt; | |
1454 | { | |
58753d74 | 1455 | EMACS_INT charpos, bytepos, startpos, beg, end, pos; |
90b3fe91 KH |
1456 | Lisp_Object val; |
1457 | int i; | |
58753d74 KH |
1458 | |
1459 | if (PT == BEGV || PT == ZV) | |
1460 | return PT; | |
1461 | ||
90b3fe91 | 1462 | /* At first check the static composition. */ |
58753d74 | 1463 | if (get_property_and_range (PT, Qcomposition, &val, &beg, &end, Qnil) |
895416e3 KH |
1464 | && COMPOSITION_VALID_P (beg, end, val)) |
1465 | { | |
1466 | if (beg < PT /* && end > PT <- It's always the case. */ | |
1467 | && (last_pt <= beg || last_pt >= end)) | |
1468 | return (PT < last_pt ? beg : end); | |
1469 | return PT; | |
1470 | } | |
58753d74 KH |
1471 | |
1472 | if (NILP (current_buffer->enable_multibyte_characters) | |
1473 | || ! FUNCTIONP (Vauto_composition_function)) | |
1474 | return PT; | |
1475 | ||
90b3fe91 | 1476 | /* Next check the automatic composition. */ |
939c679e | 1477 | if (! find_automatic_composition (PT, (EMACS_INT) -1, &beg, &end, &val, Qnil) |
90b3fe91 | 1478 | || beg == PT) |
58753d74 | 1479 | return PT; |
90b3fe91 | 1480 | for (i = 0; i < LGSTRING_GLYPH_LEN (val); i++) |
58753d74 | 1481 | { |
90b3fe91 | 1482 | Lisp_Object glyph = LGSTRING_GLYPH (val, i); |
58753d74 | 1483 | |
90b3fe91 KH |
1484 | if (NILP (glyph)) |
1485 | break; | |
1486 | if (beg + LGLYPH_FROM (glyph) == PT) | |
1487 | return PT; | |
1488 | if (beg + LGLYPH_TO (glyph) >= PT) | |
1489 | return (PT < last_pt | |
1490 | ? beg + LGLYPH_FROM (glyph) | |
1491 | : beg + LGLYPH_TO (glyph) + 1); | |
58753d74 KH |
1492 | } |
1493 | return PT; | |
1494 | } | |
1495 | ||
1496 | DEFUN ("composition-get-gstring", Fcomposition_get_gstring, | |
1497 | Scomposition_get_gstring, 4, 4, 0, | |
1498 | doc: /* Return a glyph-string for characters between FROM and TO. | |
9d751859 | 1499 | If the glyph string is for graphic display, FONT-OBJECT must be |
58753d74 | 1500 | a font-object to use for those characters. |
f5199465 KH |
1501 | Otherwise (for terminal display), FONT-OBJECT must be a terminal ID, a |
1502 | frame, or nil for the selected frame's terminal device. | |
58753d74 KH |
1503 | |
1504 | If the optional 4th argument STRING is not nil, it is a string | |
1505 | containing the target characters between indices FROM and TO. | |
1506 | ||
9d751859 EZ |
1507 | A glyph-string is a vector containing information about how to display |
1508 | a specific character sequence. The format is: | |
58753d74 KH |
1509 | [HEADER ID GLYPH ...] |
1510 | ||
1511 | HEADER is a vector of this form: | |
1512 | [FONT-OBJECT CHAR ...] | |
1513 | where | |
1514 | FONT-OBJECT is a font-object for all glyphs in the glyph-string, | |
f5199465 | 1515 | or the terminal coding system of the specified terminal. |
58753d74 KH |
1516 | CHARs are characters to be composed by GLYPHs. |
1517 | ||
1518 | ID is an identification number of the glyph-string. It may be nil if | |
1519 | not yet shaped. | |
1520 | ||
9d751859 | 1521 | GLYPH is a vector whose elements have this form: |
58753d74 KH |
1522 | [ FROM-IDX TO-IDX C CODE WIDTH LBEARING RBEARING ASCENT DESCENT |
1523 | [ [X-OFF Y-OFF WADJUST] | nil] ] | |
1524 | where | |
1525 | FROM-IDX and TO-IDX are used internally and should not be touched. | |
1526 | C is the character of the glyph. | |
1527 | CODE is the glyph-code of C in FONT-OBJECT. | |
1528 | WIDTH thru DESCENT are the metrics (in pixels) of the glyph. | |
9d751859 | 1529 | X-OFF and Y-OFF are offsets to the base position for the glyph. |
58753d74 KH |
1530 | WADJUST is the adjustment to the normal width of the glyph. |
1531 | ||
9d751859 EZ |
1532 | If GLYPH is nil, the remaining elements of the glyph-string vector |
1533 | should be ignored. */) | |
58753d74 KH |
1534 | (from, to, font_object, string) |
1535 | Lisp_Object font_object, from, to, string; | |
1536 | { | |
1537 | Lisp_Object gstring, header; | |
46f905e1 | 1538 | EMACS_INT frompos, topos; |
58753d74 | 1539 | |
ea8ba975 KH |
1540 | CHECK_NATNUM (from); |
1541 | CHECK_NATNUM (to); | |
895416e3 KH |
1542 | if (XINT (to) > XINT (from) + MAX_COMPOSITION_COMPONENTS) |
1543 | to = make_number (XINT (from) + MAX_COMPOSITION_COMPONENTS); | |
f5199465 KH |
1544 | if (! FONT_OBJECT_P (font_object)) |
1545 | { | |
1546 | struct coding_system *coding; | |
1547 | struct terminal *terminal = get_terminal (font_object, 1); | |
1548 | ||
1549 | coding = ((TERMINAL_TERMINAL_CODING (terminal)->common_flags | |
1550 | & CODING_REQUIRE_ENCODING_MASK) | |
1551 | ? TERMINAL_TERMINAL_CODING (terminal) : &safe_terminal_coding); | |
1552 | font_object = CODING_ID_NAME (coding->id); | |
1553 | } | |
1554 | ||
58753d74 KH |
1555 | header = fill_gstring_header (Qnil, from, to, font_object, string); |
1556 | gstring = gstring_lookup_cache (header); | |
1557 | if (! NILP (gstring)) | |
1558 | return gstring; | |
46f905e1 | 1559 | |
ea8ba975 KH |
1560 | frompos = XINT (from); |
1561 | topos = XINT (to); | |
46f905e1 SM |
1562 | if (LGSTRING_GLYPH_LEN (gstring_work) < topos - frompos) |
1563 | gstring_work = Fmake_vector (make_number (topos - frompos + 2), Qnil); | |
58753d74 KH |
1564 | LGSTRING_SET_HEADER (gstring_work, header); |
1565 | LGSTRING_SET_ID (gstring_work, Qnil); | |
1566 | fill_gstring_body (gstring_work); | |
1567 | return gstring_work; | |
1568 | } | |
1569 | ||
ca4c9455 KH |
1570 | \f |
1571 | /* Emacs Lisp APIs. */ | |
1572 | ||
1573 | DEFUN ("compose-region-internal", Fcompose_region_internal, | |
1574 | Scompose_region_internal, 2, 4, 0, | |
335c5470 PJ |
1575 | doc: /* Internal use only. |
1576 | ||
1577 | Compose text in the region between START and END. | |
1578 | Optional 3rd and 4th arguments are COMPONENTS and MODIFICATION-FUNC | |
9d751859 | 1579 | for the composition. See `compose-region' for more details. */) |
d562f8ab JB |
1580 | (start, end, components, modification_func) |
1581 | Lisp_Object start, end, components, modification_func; | |
ca4c9455 KH |
1582 | { |
1583 | validate_region (&start, &end); | |
1584 | if (!NILP (components) | |
1585 | && !INTEGERP (components) | |
1586 | && !CONSP (components) | |
1587 | && !STRINGP (components)) | |
b7826503 | 1588 | CHECK_VECTOR (components); |
ca4c9455 | 1589 | |
d562f8ab | 1590 | compose_text (XINT (start), XINT (end), components, modification_func, Qnil); |
ca4c9455 KH |
1591 | return Qnil; |
1592 | } | |
1593 | ||
1594 | DEFUN ("compose-string-internal", Fcompose_string_internal, | |
1595 | Scompose_string_internal, 3, 5, 0, | |
335c5470 PJ |
1596 | doc: /* Internal use only. |
1597 | ||
1598 | Compose text between indices START and END of STRING. | |
1599 | Optional 4th and 5th arguments are COMPONENTS and MODIFICATION-FUNC | |
9d751859 | 1600 | for the composition. See `compose-string' for more details. */) |
d562f8ab JB |
1601 | (string, start, end, components, modification_func) |
1602 | Lisp_Object string, start, end, components, modification_func; | |
ca4c9455 | 1603 | { |
b7826503 PJ |
1604 | CHECK_STRING (string); |
1605 | CHECK_NUMBER (start); | |
1606 | CHECK_NUMBER (end); | |
ca4c9455 KH |
1607 | |
1608 | if (XINT (start) < 0 || | |
1609 | XINT (start) > XINT (end) | |
d5db4077 | 1610 | || XINT (end) > SCHARS (string)) |
ca4c9455 KH |
1611 | args_out_of_range (start, end); |
1612 | ||
d562f8ab | 1613 | compose_text (XINT (start), XINT (end), components, modification_func, string); |
ca4c9455 KH |
1614 | return string; |
1615 | } | |
1616 | ||
1617 | DEFUN ("find-composition-internal", Ffind_composition_internal, | |
177c0ea7 | 1618 | Sfind_composition_internal, 4, 4, 0, |
335c5470 PJ |
1619 | doc: /* Internal use only. |
1620 | ||
1621 | Return information about composition at or nearest to position POS. | |
9d751859 | 1622 | See `find-composition' for more details. */) |
335c5470 | 1623 | (pos, limit, string, detail_p) |
ca4c9455 KH |
1624 | Lisp_Object pos, limit, string, detail_p; |
1625 | { | |
90b3fe91 KH |
1626 | Lisp_Object prop, tail, gstring; |
1627 | EMACS_INT start, end, from, to; | |
ca4c9455 KH |
1628 | int id; |
1629 | ||
b7826503 | 1630 | CHECK_NUMBER_COERCE_MARKER (pos); |
90b3fe91 | 1631 | from = XINT (pos); |
ca4c9455 KH |
1632 | if (!NILP (limit)) |
1633 | { | |
b7826503 | 1634 | CHECK_NUMBER_COERCE_MARKER (limit); |
90b3fe91 | 1635 | to = XINT (limit); |
ca4c9455 KH |
1636 | } |
1637 | else | |
90b3fe91 | 1638 | to = -1; |
177c0ea7 | 1639 | |
ca4c9455 | 1640 | if (!NILP (string)) |
e3b3e327 | 1641 | { |
b7826503 | 1642 | CHECK_STRING (string); |
d5db4077 | 1643 | if (XINT (pos) < 0 || XINT (pos) > SCHARS (string)) |
e3b3e327 GM |
1644 | args_out_of_range (string, pos); |
1645 | } | |
1646 | else | |
1647 | { | |
fa9090b8 | 1648 | if (XINT (pos) < BEGV || XINT (pos) > ZV) |
e3b3e327 GM |
1649 | args_out_of_range (Fcurrent_buffer (), pos); |
1650 | } | |
ca4c9455 | 1651 | |
90b3fe91 KH |
1652 | if (!find_composition (from, to, &start, &end, &prop, string)) |
1653 | { | |
1654 | if (!NILP (current_buffer->enable_multibyte_characters) | |
1655 | && FUNCTIONP (Vauto_composition_function) | |
1656 | && find_automatic_composition (from, to, &start, &end, &gstring, | |
1657 | string)) | |
1658 | return list3 (make_number (start), make_number (end), gstring); | |
1659 | return Qnil; | |
1660 | } | |
1661 | if ((end <= XINT (pos) || start > XINT (pos))) | |
1662 | { | |
1663 | EMACS_INT s, e; | |
1664 | ||
1665 | if (find_automatic_composition (from, to, &s, &e, &gstring, string) | |
1666 | && (e <= XINT (pos) ? e > end : s < start)) | |
1667 | return list3 (make_number (start), make_number (end), gstring); | |
1668 | } | |
ca4c9455 KH |
1669 | if (!COMPOSITION_VALID_P (start, end, prop)) |
1670 | return Fcons (make_number (start), Fcons (make_number (end), | |
1671 | Fcons (Qnil, Qnil))); | |
1672 | if (NILP (detail_p)) | |
1673 | return Fcons (make_number (start), Fcons (make_number (end), | |
1674 | Fcons (Qt, Qnil))); | |
1675 | ||
1676 | if (COMPOSITION_REGISTERD_P (prop)) | |
1677 | id = COMPOSITION_ID (prop); | |
1678 | else | |
1679 | { | |
1680 | int start_byte = (NILP (string) | |
1681 | ? CHAR_TO_BYTE (start) | |
1682 | : string_char_to_byte (string, start)); | |
1683 | id = get_composition_id (start, start_byte, end - start, prop, string); | |
1684 | } | |
1685 | ||
1686 | if (id >= 0) | |
1687 | { | |
1688 | Lisp_Object components, relative_p, mod_func; | |
1689 | enum composition_method method = COMPOSITION_METHOD (prop); | |
1690 | int width = composition_table[id]->width; | |
1691 | ||
1692 | components = Fcopy_sequence (COMPOSITION_COMPONENTS (prop)); | |
1693 | relative_p = (method == COMPOSITION_WITH_RULE_ALTCHARS | |
1694 | ? Qnil : Qt); | |
1695 | mod_func = COMPOSITION_MODIFICATION_FUNC (prop); | |
1696 | tail = Fcons (components, | |
1697 | Fcons (relative_p, | |
1698 | Fcons (mod_func, | |
1699 | Fcons (make_number (width), Qnil)))); | |
1700 | } | |
1701 | else | |
1702 | tail = Qnil; | |
1703 | ||
1704 | return Fcons (make_number (start), Fcons (make_number (end), tail)); | |
1705 | } | |
1706 | ||
1707 | \f | |
1708 | void | |
1709 | syms_of_composite () | |
1710 | { | |
58753d74 KH |
1711 | int i; |
1712 | ||
ca4c9455 KH |
1713 | Qcomposition = intern ("composition"); |
1714 | staticpro (&Qcomposition); | |
1715 | ||
58753d74 | 1716 | /* Make a hash table for static composition. */ |
ca4c9455 | 1717 | { |
09654086 | 1718 | Lisp_Object args[6]; |
ca4c9455 | 1719 | extern Lisp_Object QCsize; |
177c0ea7 | 1720 | |
ca4c9455 KH |
1721 | args[0] = QCtest; |
1722 | args[1] = Qequal; | |
1723 | args[2] = QCweakness; | |
dc47eccc | 1724 | /* We used to make the hash table weak so that unreferenced |
ca101cff | 1725 | compositions can be garbage-collected. But, usually once |
dc47eccc KH |
1726 | created compositions are repeatedly used in an Emacs session, |
1727 | and thus it's not worth to save memory in such a way. So, we | |
1728 | make the table not weak. */ | |
6a83ee8a | 1729 | args[3] = Qnil; |
ca4c9455 KH |
1730 | args[4] = QCsize; |
1731 | args[5] = make_number (311); | |
09654086 | 1732 | composition_hash_table = Fmake_hash_table (6, args); |
ca4c9455 KH |
1733 | staticpro (&composition_hash_table); |
1734 | } | |
1735 | ||
58753d74 KH |
1736 | /* Make a hash table for glyph-string. */ |
1737 | { | |
1738 | Lisp_Object args[6]; | |
1739 | extern Lisp_Object QCsize; | |
1740 | ||
1741 | args[0] = QCtest; | |
1742 | args[1] = Qequal; | |
1743 | args[2] = QCweakness; | |
1744 | args[3] = Qnil; | |
1745 | args[4] = QCsize; | |
1746 | args[5] = make_number (311); | |
1747 | gstring_hash_table = Fmake_hash_table (6, args); | |
1748 | staticpro (&gstring_hash_table); | |
1749 | } | |
1750 | ||
1751 | staticpro (&gstring_work_headers); | |
1752 | gstring_work_headers = Fmake_vector (make_number (8), Qnil); | |
1753 | for (i = 0; i < 8; i++) | |
1754 | ASET (gstring_work_headers, i, Fmake_vector (make_number (i + 2), Qnil)); | |
1755 | staticpro (&gstring_work); | |
1756 | gstring_work = Fmake_vector (make_number (10), Qnil); | |
1757 | ||
ca4c9455 KH |
1758 | /* Text property `composition' should be nonsticky by default. */ |
1759 | Vtext_property_default_nonsticky | |
1760 | = Fcons (Fcons (Qcomposition, Qt), Vtext_property_default_nonsticky); | |
1761 | ||
1762 | DEFVAR_LISP ("compose-chars-after-function", &Vcompose_chars_after_function, | |
335c5470 PJ |
1763 | doc: /* Function to adjust composition of buffer text. |
1764 | ||
9d751859 EZ |
1765 | This function is called with three arguments: FROM, TO, and OBJECT. |
1766 | FROM and TO specify the range of text whose composition should be | |
335c5470 PJ |
1767 | adjusted. OBJECT, if non-nil, is a string that contains the text. |
1768 | ||
1769 | This function is called after a text with `composition' property is | |
1770 | inserted or deleted to keep `composition' property of buffer text | |
1771 | valid. | |
1772 | ||
1773 | The default value is the function `compose-chars-after'. */); | |
ca4c9455 KH |
1774 | Vcompose_chars_after_function = intern ("compose-chars-after"); |
1775 | ||
f96ba4c1 KH |
1776 | Qauto_composed = intern ("auto-composed"); |
1777 | staticpro (&Qauto_composed); | |
40add26d | 1778 | |
f96ba4c1 KH |
1779 | Qauto_composition_function = intern ("auto-composition-function"); |
1780 | staticpro (&Qauto_composition_function); | |
40add26d | 1781 | |
f96ba4c1 KH |
1782 | DEFVAR_LISP ("auto-composition-function", &Vauto_composition_function, |
1783 | doc: /* Function to call to compose characters automatically. | |
9d751859 | 1784 | This function is called from the display routine with four arguments: |
ddc872ba | 1785 | FROM, TO, WINDOW, and STRING. |
335c5470 | 1786 | |
ddc872ba KH |
1787 | If STRING is nil, the function must compose characters in the region |
1788 | between FROM and TO in the current buffer. | |
335c5470 | 1789 | |
ddc872ba KH |
1790 | Otherwise, STRING is a string, and FROM and TO are indices into the |
1791 | string. In this case, the function must compose characters in the | |
1792 | string. */); | |
f96ba4c1 | 1793 | Vauto_composition_function = Qnil; |
40add26d | 1794 | |
58753d74 | 1795 | DEFVAR_LISP ("composition-function-table", &Vcomposition_function_table, |
9d751859 | 1796 | doc: /* Char-table of functions for automatic character composition. |
58753d74 KH |
1797 | For each character that has to be composed automatically with |
1798 | preceding and/or following characters, this char-table contains | |
1799 | a function to call to compose that character. | |
1800 | ||
1801 | The element at index C in the table, if non-nil, is a list of | |
1802 | this form: ([PATTERN PREV-CHARS FUNC] ...) | |
1803 | ||
9d751859 | 1804 | PATTERN is a regular expression which C and the surrounding |
58753d74 KH |
1805 | characters must match. |
1806 | ||
895416e3 KH |
1807 | PREV-CHARS is a non-negative integer (less than 4) specifying how many |
1808 | characters before C to check the matching with PATTERN. If it is 0, | |
1809 | PATTERN must match C and the following characters. If it is 1, | |
1810 | PATTERN must match a character before C and the following characters. | |
58753d74 KH |
1811 | |
1812 | If PREV-CHARS is 0, PATTERN can be nil, which means that the | |
1813 | single character C should be composed. | |
1814 | ||
1815 | FUNC is a function to return a glyph-string representing a | |
9d751859 | 1816 | composition of the characters that match PATTERN. It is |
58753d74 KH |
1817 | called with one argument GSTRING. |
1818 | ||
1819 | GSTRING is a template of a glyph-string to return. It is already | |
1820 | filled with a proper header for the characters to compose, and | |
1821 | glyphs corresponding to those characters one by one. The | |
9d751859 | 1822 | function must return a new glyph-string with the same header as |
58753d74 KH |
1823 | GSTRING, or modify GSTRING itself and return it. |
1824 | ||
1825 | See also the documentation of `auto-composition-mode'. */); | |
1826 | Vcomposition_function_table = Fmake_char_table (Qnil, Qnil); | |
1827 | ||
ca4c9455 KH |
1828 | defsubr (&Scompose_region_internal); |
1829 | defsubr (&Scompose_string_internal); | |
1830 | defsubr (&Sfind_composition_internal); | |
58753d74 | 1831 | defsubr (&Scomposition_get_gstring); |
ca4c9455 | 1832 | } |
ee6f9c59 KH |
1833 | |
1834 | /* arch-tag: 79cefaf8-ca48-4eed-97e5-d5afb290d272 | |
1835 | (do not change this comment) */ |