Commit | Line | Data |
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ca4c9455 | 1 | /* Composite sequence support. |
aaef169d | 2 | Copyright (C) 2001, 2002, 2003, 2004, 2005, |
8cabe764 GM |
3 | 2006, 2007, 2008 Free Software Foundation, Inc. |
4 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
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" |
ca4c9455 | 30 | #include "intervals.h" |
58753d74 KH |
31 | #include "window.h" |
32 | #include "frame.h" | |
33 | #include "dispextern.h" | |
34 | #include "font.h" | |
ca4c9455 KH |
35 | |
36 | /* Emacs uses special text property `composition' to support character | |
37 | composition. A sequence of characters that have the same (i.e. eq) | |
38 | `composition' property value is treated as a single composite | |
39 | sequence (we call it just `composition' here after). Characters in | |
40 | a composition are all composed somehow on the screen. | |
41 | ||
42 | The property value has this form when the composition is made: | |
43 | ((LENGTH . COMPONENTS) . MODIFICATION-FUNC) | |
44 | then turns to this form: | |
45 | (COMPOSITION-ID . (LENGTH COMPONENTS-VEC . MODIFICATION-FUNC)) | |
46 | when the composition is registered in composition_hash_table and | |
47 | composition_table. These rather peculiar structures were designed | |
48 | to make it easy to distinguish them quickly (we can do that by | |
49 | checking only the first element) and to extract LENGTH (from the | |
50 | former form) and COMPOSITION-ID (from the latter form). | |
51 | ||
52 | We register a composition when it is displayed, or when the width | |
53 | is required (for instance, to calculate columns). | |
54 | ||
55 | LENGTH -- Length of the composition. This information is used to | |
56 | check the validity of the composition. | |
57 | ||
58 | COMPONENTS -- Character, string, vector, list, or nil. | |
59 | ||
60 | If it is nil, characters in the text are composed relatively | |
61 | according to their metrics in font glyphs. | |
62 | ||
63 | If it is a character or a string, the character or characters | |
64 | in the string are composed relatively. | |
65 | ||
66 | If it is a vector or list of integers, the element is a | |
67 | character or an encoded composition rule. The characters are | |
68 | composed according to the rules. (2N)th elements are | |
69 | characters to be composed and (2N+1)th elements are | |
70 | composition rules to tell how to compose (2N+2)th element with | |
71 | the previously composed 2N glyphs. | |
72 | ||
73 | COMPONENTS-VEC -- Vector of integers. In relative composition, the | |
74 | elements are characters to be composed. In rule-base | |
75 | composition, the elements are characters or encoded | |
76 | composition rules. | |
77 | ||
78 | MODIFICATION-FUNC -- If non nil, it is a function to call when the | |
79 | composition gets invalid after a modification in a buffer. If | |
80 | it is nil, a function in `composition-function-table' of the | |
81 | first character in the sequence is called. | |
82 | ||
83 | COMPOSITION-ID --Identification number of the composition. It is | |
84 | used as an index to composition_table for the composition. | |
85 | ||
86 | When Emacs has to display a composition or has to know its | |
87 | displaying width, the function get_composition_id is called. It | |
88 | returns COMPOSITION-ID so that the caller can access the | |
89 | information about the composition through composition_table. If a | |
90 | COMPOSITION-ID has not yet been assigned to the composition, | |
91 | get_composition_id checks the validity of `composition' property, | |
92 | and, if valid, assigns a new ID, registers the information in | |
93 | composition_hash_table and composition_table, and changes the form | |
94 | of the property value. If the property is invalid, return -1 | |
95 | without changing the property value. | |
96 | ||
97 | We use two tables to keep information about composition; | |
98 | composition_hash_table and composition_table. | |
99 | ||
100 | The former is a hash table in which keys are COMPONENTS-VECs and | |
101 | values are the corresponding COMPOSITION-IDs. This hash table is | |
4abc7470 | 102 | weak, but as each key (COMPONENTS-VEC) is also kept as a value of the |
ca4c9455 | 103 | `composition' property, it won't be collected as garbage until all |
4abc7470 | 104 | bits of text that have the same COMPONENTS-VEC are deleted. |
ca4c9455 KH |
105 | |
106 | The latter is a table of pointers to `struct composition' indexed | |
4abc7470 | 107 | by COMPOSITION-ID. This structure keeps the other information (see |
ca4c9455 KH |
108 | composite.h). |
109 | ||
110 | In general, a text property holds information about individual | |
111 | characters. But, a `composition' property holds information about | |
4abc7470 | 112 | a sequence of characters (in this sense, it is like the `intangible' |
ca4c9455 | 113 | property). That means that we should not share the property value |
4abc7470 | 114 | in adjacent compositions -- we can't distinguish them if they have the |
ca4c9455 KH |
115 | same property. So, after any changes, we call |
116 | `update_compositions' and change a property of one of adjacent | |
117 | compositions to a copy of it. This function also runs a proper | |
118 | composition modification function to make a composition that gets | |
119 | invalid by the change valid again. | |
120 | ||
4abc7470 | 121 | As the value of the `composition' property holds information about a |
ca4c9455 | 122 | specific range of text, the value gets invalid if we change the |
4abc7470 | 123 | text in the range. We treat the `composition' property as always |
ca4c9455 KH |
124 | rear-nonsticky (currently by setting default-text-properties to |
125 | (rear-nonsticky (composition))) and we never make properties of | |
126 | adjacent compositions identical. Thus, any such changes make the | |
4abc7470 | 127 | range just shorter. So, we can check the validity of the `composition' |
ca4c9455 KH |
128 | property by comparing LENGTH information with the actual length of |
129 | the composition. | |
130 | ||
131 | */ | |
132 | ||
133 | ||
134 | Lisp_Object Qcomposition; | |
135 | ||
136 | /* Table of pointers to the structure `composition' indexed by | |
137 | COMPOSITION-ID. This structure is for storing information about | |
138 | each composition except for COMPONENTS-VEC. */ | |
139 | struct composition **composition_table; | |
140 | ||
141 | /* The current size of `composition_table'. */ | |
142 | static int composition_table_size; | |
143 | ||
144 | /* Number of compositions currently made. */ | |
145 | int n_compositions; | |
146 | ||
147 | /* Hash table for compositions. The key is COMPONENTS-VEC of | |
148 | `composition' property. The value is the corresponding | |
149 | COMPOSITION-ID. */ | |
150 | Lisp_Object composition_hash_table; | |
151 | ||
152 | /* Function to call to adjust composition. */ | |
153 | Lisp_Object Vcompose_chars_after_function; | |
154 | ||
f96ba4c1 KH |
155 | Lisp_Object Qauto_composed; |
156 | Lisp_Object Vauto_composition_function; | |
157 | Lisp_Object Qauto_composition_function; | |
58753d74 | 158 | Lisp_Object Vcomposition_function_table; |
40add26d | 159 | |
ea058d2c DL |
160 | EXFUN (Fremove_list_of_text_properties, 4); |
161 | ||
ca4c9455 KH |
162 | /* Temporary variable used in macros COMPOSITION_XXX. */ |
163 | Lisp_Object composition_temp; | |
f30d8d94 | 164 | |
ca4c9455 | 165 | \f |
ca4c9455 KH |
166 | /* Return COMPOSITION-ID of a composition at buffer position |
167 | CHARPOS/BYTEPOS and length NCHARS. The `composition' property of | |
168 | the sequence is PROP. STRING, if non-nil, is a string that | |
169 | contains the composition instead of the current buffer. | |
170 | ||
171 | If the composition is invalid, return -1. */ | |
172 | ||
173 | int | |
174 | get_composition_id (charpos, bytepos, nchars, prop, string) | |
175 | int charpos, bytepos, nchars; | |
176 | Lisp_Object prop, string; | |
177 | { | |
178 | Lisp_Object id, length, components, key, *key_contents; | |
179 | int glyph_len; | |
180 | struct Lisp_Hash_Table *hash_table = XHASH_TABLE (composition_hash_table); | |
181 | int hash_index; | |
182 | unsigned hash_code; | |
183 | struct composition *cmp; | |
184 | int i, ch; | |
185 | ||
186 | /* PROP should be | |
187 | Form-A: ((LENGTH . COMPONENTS) . MODIFICATION-FUNC) | |
188 | or | |
189 | Form-B: (COMPOSITION-ID . (LENGTH COMPONENTS-VEC . MODIFICATION-FUNC)) | |
190 | */ | |
191 | if (nchars == 0 || !CONSP (prop)) | |
192 | goto invalid_composition; | |
193 | ||
194 | id = XCAR (prop); | |
195 | if (INTEGERP (id)) | |
196 | { | |
197 | /* PROP should be Form-B. */ | |
198 | if (XINT (id) < 0 || XINT (id) >= n_compositions) | |
199 | goto invalid_composition; | |
200 | return XINT (id); | |
201 | } | |
202 | ||
203 | /* PROP should be Form-A. | |
204 | Thus, ID should be (LENGTH . COMPONENTS). */ | |
205 | if (!CONSP (id)) | |
206 | goto invalid_composition; | |
207 | length = XCAR (id); | |
208 | if (!INTEGERP (length) || XINT (length) != nchars) | |
209 | goto invalid_composition; | |
210 | ||
211 | components = XCDR (id); | |
212 | ||
213 | /* Check if the same composition has already been registered or not | |
214 | by consulting composition_hash_table. The key for this table is | |
215 | COMPONENTS (converted to a vector COMPONENTS-VEC) or, if it is | |
216 | nil, vector of characters in the composition range. */ | |
217 | if (INTEGERP (components)) | |
218 | key = Fmake_vector (make_number (1), components); | |
219 | else if (STRINGP (components) || CONSP (components)) | |
220 | key = Fvconcat (1, &components); | |
221 | else if (VECTORP (components)) | |
222 | key = components; | |
223 | else if (NILP (components)) | |
224 | { | |
225 | key = Fmake_vector (make_number (nchars), Qnil); | |
226 | if (STRINGP (string)) | |
227 | for (i = 0; i < nchars; i++) | |
228 | { | |
229 | FETCH_STRING_CHAR_ADVANCE (ch, string, charpos, bytepos); | |
230 | XVECTOR (key)->contents[i] = make_number (ch); | |
231 | } | |
232 | else | |
233 | for (i = 0; i < nchars; i++) | |
234 | { | |
235 | FETCH_CHAR_ADVANCE (ch, charpos, bytepos); | |
236 | XVECTOR (key)->contents[i] = make_number (ch); | |
237 | } | |
238 | } | |
239 | else | |
240 | goto invalid_composition; | |
241 | ||
242 | hash_index = hash_lookup (hash_table, key, &hash_code); | |
243 | if (hash_index >= 0) | |
244 | { | |
245 | /* We have already registered the same composition. Change PROP | |
246 | from Form-A above to Form-B while replacing COMPONENTS with | |
247 | COMPONENTS-VEC stored in the hash table. We can directly | |
248 | modify the cons cell of PROP because it is not shared. */ | |
249 | key = HASH_KEY (hash_table, hash_index); | |
250 | id = HASH_VALUE (hash_table, hash_index); | |
f3fbd155 KR |
251 | XSETCAR (prop, id); |
252 | XSETCDR (prop, Fcons (make_number (nchars), Fcons (key, XCDR (prop)))); | |
ca4c9455 KH |
253 | return XINT (id); |
254 | } | |
255 | ||
256 | /* This composition is a new one. We must register it. */ | |
177c0ea7 | 257 | |
ca4c9455 KH |
258 | /* Check if we have sufficient memory to store this information. */ |
259 | if (composition_table_size == 0) | |
260 | { | |
261 | composition_table_size = 256; | |
262 | composition_table | |
263 | = (struct composition **) xmalloc (sizeof (composition_table[0]) | |
264 | * composition_table_size); | |
265 | } | |
266 | else if (composition_table_size <= n_compositions) | |
267 | { | |
268 | composition_table_size += 256; | |
269 | composition_table | |
270 | = (struct composition **) xrealloc (composition_table, | |
271 | sizeof (composition_table[0]) | |
272 | * composition_table_size); | |
273 | } | |
274 | ||
275 | key_contents = XVECTOR (key)->contents; | |
276 | ||
277 | /* Check if the contents of COMPONENTS are valid if COMPONENTS is a | |
278 | vector or a list. It should be a sequence of: | |
279 | char1 rule1 char2 rule2 char3 ... ruleN charN+1 */ | |
f30d8d94 | 280 | |
dd5e1ed4 | 281 | if (VECTORP (components) |
f30d8d94 KH |
282 | && ASIZE (components) >= 2 |
283 | && VECTORP (AREF (components, 0))) | |
284 | { | |
285 | /* COMPONENTS is a glyph-string. */ | |
286 | int len = ASIZE (key); | |
287 | ||
288 | for (i = 1; i < len; i++) | |
289 | if (! VECTORP (AREF (key, i))) | |
290 | goto invalid_composition; | |
291 | } | |
dd5e1ed4 | 292 | else if (VECTORP (components) || CONSP (components)) |
ca4c9455 KH |
293 | { |
294 | int len = XVECTOR (key)->size; | |
295 | ||
296 | /* The number of elements should be odd. */ | |
297 | if ((len % 2) == 0) | |
298 | goto invalid_composition; | |
299 | /* All elements should be integers (character or encoded | |
300 | composition rule). */ | |
301 | for (i = 0; i < len; i++) | |
302 | { | |
303 | if (!INTEGERP (key_contents[i])) | |
304 | goto invalid_composition; | |
305 | } | |
306 | } | |
307 | ||
308 | /* Change PROP from Form-A above to Form-B. We can directly modify | |
309 | the cons cell of PROP because it is not shared. */ | |
310 | XSETFASTINT (id, n_compositions); | |
f3fbd155 KR |
311 | XSETCAR (prop, id); |
312 | XSETCDR (prop, Fcons (make_number (nchars), Fcons (key, XCDR (prop)))); | |
ca4c9455 KH |
313 | |
314 | /* Register the composition in composition_hash_table. */ | |
315 | hash_index = hash_put (hash_table, key, id, hash_code); | |
316 | ||
317 | /* Register the composition in composition_table. */ | |
318 | cmp = (struct composition *) xmalloc (sizeof (struct composition)); | |
319 | ||
320 | cmp->method = (NILP (components) | |
321 | ? COMPOSITION_RELATIVE | |
322 | : ((INTEGERP (components) || STRINGP (components)) | |
323 | ? COMPOSITION_WITH_ALTCHARS | |
324 | : COMPOSITION_WITH_RULE_ALTCHARS)); | |
325 | cmp->hash_index = hash_index; | |
326 | glyph_len = (cmp->method == COMPOSITION_WITH_RULE_ALTCHARS | |
327 | ? (XVECTOR (key)->size + 1) / 2 | |
328 | : XVECTOR (key)->size); | |
329 | cmp->glyph_len = glyph_len; | |
330 | cmp->offsets = (short *) xmalloc (sizeof (short) * glyph_len * 2); | |
331 | cmp->font = NULL; | |
332 | ||
58753d74 | 333 | if (cmp->method != COMPOSITION_WITH_RULE_ALTCHARS) |
ca4c9455 KH |
334 | { |
335 | /* Relative composition. */ | |
336 | cmp->width = 0; | |
337 | for (i = 0; i < glyph_len; i++) | |
338 | { | |
339 | int this_width; | |
340 | ch = XINT (key_contents[i]); | |
8e86803c | 341 | this_width = (ch == '\t' ? 1 : CHAR_WIDTH (ch)); |
ca4c9455 KH |
342 | if (cmp->width < this_width) |
343 | cmp->width = this_width; | |
344 | } | |
345 | } | |
346 | else | |
347 | { | |
348 | /* Rule-base composition. */ | |
349 | float leftmost = 0.0, rightmost; | |
350 | ||
351 | ch = XINT (key_contents[0]); | |
69df789a | 352 | rightmost = ch != '\t' ? CHAR_WIDTH (ch) : 1; |
ca4c9455 KH |
353 | |
354 | for (i = 1; i < glyph_len; i += 2) | |
355 | { | |
464f8566 | 356 | int rule, gref, nref, xoff, yoff; |
ca4c9455 KH |
357 | int this_width; |
358 | float this_left; | |
359 | ||
360 | rule = XINT (key_contents[i]); | |
361 | ch = XINT (key_contents[i + 1]); | |
69df789a | 362 | this_width = ch != '\t' ? CHAR_WIDTH (ch) : 1; |
ca4c9455 KH |
363 | |
364 | /* A composition rule is specified by an integer value | |
365 | that encodes global and new reference points (GREF and | |
366 | NREF). GREF and NREF are specified by numbers as | |
367 | below: | |
368 | 0---1---2 -- ascent | |
369 | | | | |
370 | | | | |
371 | | | | |
372 | 9--10--11 -- center | |
373 | | | | |
374 | ---3---4---5--- baseline | |
375 | | | | |
376 | 6---7---8 -- descent | |
377 | */ | |
464f8566 | 378 | COMPOSITION_DECODE_RULE (rule, gref, nref, xoff, yoff); |
ca4c9455 KH |
379 | this_left = (leftmost |
380 | + (gref % 3) * (rightmost - leftmost) / 2.0 | |
381 | - (nref % 3) * this_width / 2.0); | |
382 | ||
383 | if (this_left < leftmost) | |
384 | leftmost = this_left; | |
385 | if (this_left + this_width > rightmost) | |
386 | rightmost = this_left + this_width; | |
387 | } | |
388 | ||
389 | cmp->width = rightmost - leftmost; | |
390 | if (cmp->width < (rightmost - leftmost)) | |
391 | /* To get a ceiling integer value. */ | |
392 | cmp->width++; | |
393 | } | |
394 | ||
395 | composition_table[n_compositions] = cmp; | |
396 | ||
397 | return n_compositions++; | |
398 | ||
399 | invalid_composition: | |
400 | /* Would it be better to remove this `composition' property? */ | |
401 | return -1; | |
402 | } | |
403 | ||
404 | \f | |
405 | /* Find a composition at or nearest to position POS of OBJECT (buffer | |
406 | or string). | |
407 | ||
408 | OBJECT defaults to the current buffer. If there's a composition at | |
409 | POS, set *START and *END to the start and end of the sequence, | |
410 | *PROP to the `composition' property, and return 1. | |
411 | ||
412 | If there's no composition at POS and LIMIT is negative, return 0. | |
413 | ||
414 | Otherwise, search for a composition forward (LIMIT > POS) or | |
415 | backward (LIMIT < POS). In this case, LIMIT bounds the search. | |
416 | ||
417 | If a composition is found, set *START, *END, and *PROP as above, | |
418 | and return 1, else return 0. | |
419 | ||
420 | This doesn't check the validity of composition. */ | |
421 | ||
422 | int | |
423 | find_composition (pos, limit, start, end, prop, object) | |
aaefca97 DL |
424 | int pos, limit; |
425 | EMACS_INT *start, *end; | |
ca4c9455 KH |
426 | Lisp_Object *prop, object; |
427 | { | |
428 | Lisp_Object val; | |
429 | ||
430 | if (get_property_and_range (pos, Qcomposition, prop, start, end, object)) | |
431 | return 1; | |
432 | ||
433 | if (limit < 0 || limit == pos) | |
434 | return 0; | |
435 | ||
436 | if (limit > pos) /* search forward */ | |
d279f620 KH |
437 | { |
438 | val = Fnext_single_property_change (make_number (pos), Qcomposition, | |
439 | object, make_number (limit)); | |
440 | pos = XINT (val); | |
441 | if (pos == limit) | |
442 | return 0; | |
443 | } | |
ca4c9455 | 444 | else /* search backward */ |
d279f620 KH |
445 | { |
446 | if (get_property_and_range (pos - 1, Qcomposition, prop, start, end, | |
447 | object)) | |
448 | return 1; | |
449 | val = Fprevious_single_property_change (make_number (pos), Qcomposition, | |
450 | object, make_number (limit)); | |
451 | pos = XINT (val); | |
452 | if (pos == limit) | |
453 | return 0; | |
454 | pos--; | |
455 | } | |
ca4c9455 KH |
456 | get_property_and_range (pos, Qcomposition, prop, start, end, object); |
457 | return 1; | |
458 | } | |
459 | ||
460 | /* Run a proper function to adjust the composition sitting between | |
461 | FROM and TO with property PROP. */ | |
462 | ||
463 | static void | |
464 | run_composition_function (from, to, prop) | |
465 | int from, to; | |
466 | Lisp_Object prop; | |
467 | { | |
7d019510 | 468 | Lisp_Object func; |
aaefca97 | 469 | EMACS_INT start, end; |
ca4c9455 KH |
470 | |
471 | func = COMPOSITION_MODIFICATION_FUNC (prop); | |
472 | /* If an invalid composition precedes or follows, try to make them | |
473 | valid too. */ | |
474 | if (from > BEGV | |
475 | && find_composition (from - 1, -1, &start, &end, &prop, Qnil) | |
476 | && !COMPOSITION_VALID_P (start, end, prop)) | |
477 | from = start; | |
478 | if (to < ZV | |
479 | && find_composition (to, -1, &start, &end, &prop, Qnil) | |
480 | && !COMPOSITION_VALID_P (start, end, prop)) | |
481 | to = end; | |
775b3d2d | 482 | if (!NILP (Ffboundp (func))) |
ca4c9455 | 483 | call2 (func, make_number (from), make_number (to)); |
ca4c9455 KH |
484 | } |
485 | ||
486 | /* Make invalid compositions adjacent to or inside FROM and TO valid. | |
487 | CHECK_MASK is bitwise `or' of mask bits defined by macros | |
488 | CHECK_XXX (see the comment in composite.h). | |
489 | ||
b418f8a6 | 490 | It also resets the text-property `auto-composed' to a proper region |
f96ba4c1 KH |
491 | so that automatic character composition works correctly later while |
492 | displaying the region. | |
8f924df7 | 493 | |
ca4c9455 KH |
494 | This function is called when a buffer text is changed. If the |
495 | change is deletion, FROM == TO. Otherwise, FROM < TO. */ | |
496 | ||
497 | void | |
498 | update_compositions (from, to, check_mask) | |
aaefca97 DL |
499 | EMACS_INT from, to; |
500 | int check_mask; | |
ca4c9455 | 501 | { |
7d019510 | 502 | Lisp_Object prop; |
aaefca97 | 503 | EMACS_INT start, end; |
f96ba4c1 KH |
504 | /* The beginning and end of the region to set the property |
505 | `auto-composed' to nil. */ | |
aaefca97 | 506 | EMACS_INT min_pos = from, max_pos = to; |
ca4c9455 | 507 | |
6c1aa7f1 GM |
508 | if (inhibit_modification_hooks) |
509 | return; | |
177c0ea7 | 510 | |
d3f40cbd KH |
511 | /* If FROM and TO are not in a valid range, do nothing. */ |
512 | if (! (BEGV <= from && from <= to && to <= ZV)) | |
513 | return; | |
514 | ||
ca4c9455 KH |
515 | if (check_mask & CHECK_HEAD) |
516 | { | |
517 | /* FROM should be at composition boundary. But, insertion or | |
518 | deletion will make two compositions adjacent and | |
519 | indistinguishable when they have same (eq) property. To | |
520 | avoid it, in such a case, we change the property of the | |
521 | latter to the copy of it. */ | |
522 | if (from > BEGV | |
553d3164 KH |
523 | && find_composition (from - 1, -1, &start, &end, &prop, Qnil) |
524 | && COMPOSITION_VALID_P (start, end, prop)) | |
ca4c9455 | 525 | { |
f96ba4c1 KH |
526 | min_pos = start; |
527 | if (end > to) | |
528 | max_pos = end; | |
ca4c9455 KH |
529 | if (from < end) |
530 | Fput_text_property (make_number (from), make_number (end), | |
531 | Qcomposition, | |
532 | Fcons (XCAR (prop), XCDR (prop)), Qnil); | |
533 | run_composition_function (start, end, prop); | |
534 | from = end; | |
535 | } | |
dd33cc56 | 536 | else if (from < ZV |
553d3164 | 537 | && find_composition (from, -1, &start, &from, &prop, Qnil) |
9657d668 | 538 | && COMPOSITION_VALID_P (start, from, prop)) |
f96ba4c1 KH |
539 | { |
540 | if (from > to) | |
541 | max_pos = from; | |
542 | run_composition_function (start, from, prop); | |
543 | } | |
ca4c9455 KH |
544 | } |
545 | ||
546 | if (check_mask & CHECK_INSIDE) | |
547 | { | |
548 | /* In this case, we are sure that (check & CHECK_TAIL) is also | |
549 | nonzero. Thus, here we should check only compositions before | |
550 | (to - 1). */ | |
551 | while (from < to - 1 | |
552 | && find_composition (from, to, &start, &from, &prop, Qnil) | |
9657d668 | 553 | && COMPOSITION_VALID_P (start, from, prop) |
ca4c9455 KH |
554 | && from < to - 1) |
555 | run_composition_function (start, from, prop); | |
556 | } | |
557 | ||
558 | if (check_mask & CHECK_TAIL) | |
559 | { | |
560 | if (from < to | |
553d3164 KH |
561 | && find_composition (to - 1, -1, &start, &end, &prop, Qnil) |
562 | && COMPOSITION_VALID_P (start, end, prop)) | |
ca4c9455 KH |
563 | { |
564 | /* TO should be also at composition boundary. But, | |
565 | insertion or deletion will make two compositions adjacent | |
566 | and indistinguishable when they have same (eq) property. | |
567 | To avoid it, in such a case, we change the property of | |
568 | the former to the copy of it. */ | |
569 | if (to < end) | |
f96ba4c1 KH |
570 | { |
571 | Fput_text_property (make_number (start), make_number (to), | |
572 | Qcomposition, | |
573 | Fcons (XCAR (prop), XCDR (prop)), Qnil); | |
574 | max_pos = end; | |
575 | } | |
ca4c9455 KH |
576 | run_composition_function (start, end, prop); |
577 | } | |
578 | else if (to < ZV | |
553d3164 KH |
579 | && find_composition (to, -1, &start, &end, &prop, Qnil) |
580 | && COMPOSITION_VALID_P (start, end, prop)) | |
f96ba4c1 KH |
581 | { |
582 | run_composition_function (start, end, prop); | |
583 | max_pos = end; | |
584 | } | |
ca4c9455 | 585 | } |
f96ba4c1 | 586 | if (min_pos < max_pos) |
9d440521 KH |
587 | { |
588 | int count = SPECPDL_INDEX (); | |
589 | ||
590 | specbind (Qinhibit_read_only, Qt); | |
591 | specbind (Qinhibit_modification_hooks, Qt); | |
592 | specbind (Qinhibit_point_motion_hooks, Qt); | |
593 | Fremove_list_of_text_properties (make_number (min_pos), | |
594 | make_number (max_pos), | |
595 | Fcons (Qauto_composed, Qnil), Qnil); | |
596 | unbind_to (count, Qnil); | |
597 | } | |
ca4c9455 KH |
598 | } |
599 | ||
c1361885 KH |
600 | |
601 | /* Modify composition property values in LIST destructively. LIST is | |
602 | a list as returned from text_property_list. Change values to the | |
603 | top-level copies of them so that none of them are `eq'. */ | |
604 | ||
605 | void | |
606 | make_composition_value_copy (list) | |
607 | Lisp_Object list; | |
608 | { | |
609 | Lisp_Object plist, val; | |
610 | ||
611 | for (; CONSP (list); list = XCDR (list)) | |
612 | { | |
613 | plist = XCAR (XCDR (XCDR (XCAR (list)))); | |
614 | while (CONSP (plist) && CONSP (XCDR (plist))) | |
615 | { | |
616 | if (EQ (XCAR (plist), Qcomposition) | |
617 | && (val = XCAR (XCDR (plist)), CONSP (val))) | |
f3fbd155 | 618 | XSETCAR (XCDR (plist), Fcons (XCAR (val), XCDR (val))); |
c1361885 KH |
619 | plist = XCDR (XCDR (plist)); |
620 | } | |
621 | } | |
622 | } | |
623 | ||
624 | ||
ca4c9455 KH |
625 | /* Make text in the region between START and END a composition that |
626 | has COMPONENTS and MODIFICATION-FUNC. | |
627 | ||
628 | If STRING is non-nil, then operate on characters contained between | |
629 | indices START and END in STRING. */ | |
630 | ||
631 | void | |
632 | compose_text (start, end, components, modification_func, string) | |
633 | int start, end; | |
634 | Lisp_Object components, modification_func, string; | |
635 | { | |
636 | Lisp_Object prop; | |
637 | ||
638 | prop = Fcons (Fcons (make_number (end - start), components), | |
639 | modification_func); | |
640 | Fput_text_property (make_number (start), make_number (end), | |
641 | Qcomposition, prop, string); | |
642 | } | |
58753d74 KH |
643 | |
644 | ||
645 | static Lisp_Object autocmp_chars P_ ((Lisp_Object, EMACS_INT, EMACS_INT, | |
646 | EMACS_INT, struct window *, | |
647 | struct face *, Lisp_Object)); | |
648 | ||
649 | \f | |
650 | /* Lisp glyph-string handlers */ | |
651 | ||
652 | /* Hash table for automatic composition. The key is a header of a | |
653 | lgstring (Lispy glyph-string), and the value is a body of a | |
654 | lgstring. */ | |
655 | ||
656 | static Lisp_Object gstring_hash_table; | |
657 | ||
658 | static Lisp_Object gstring_lookup_cache P_ ((Lisp_Object)); | |
659 | ||
660 | static Lisp_Object | |
661 | gstring_lookup_cache (header) | |
662 | Lisp_Object header; | |
663 | { | |
664 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
665 | int i = hash_lookup (h, header, NULL); | |
666 | ||
667 | return (i >= 0 ? HASH_VALUE (h, i) : Qnil); | |
668 | } | |
669 | ||
670 | Lisp_Object | |
671 | composition_gstring_put_cache (gstring, len) | |
672 | Lisp_Object gstring; | |
673 | int len; | |
674 | { | |
675 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
676 | unsigned hash; | |
677 | Lisp_Object header, copy; | |
678 | int i; | |
679 | ||
680 | header = LGSTRING_HEADER (gstring); | |
681 | hash = h->hashfn (h, header); | |
682 | if (len < 0) | |
683 | { | |
684 | len = LGSTRING_GLYPH_LEN (gstring); | |
685 | for (i = 0; i < len; i++) | |
686 | if (NILP (LGSTRING_GLYPH (gstring, i))) | |
687 | break; | |
688 | len = i; | |
689 | } | |
690 | ||
691 | copy = Fmake_vector (make_number (len + 2), Qnil); | |
692 | LGSTRING_SET_HEADER (copy, Fcopy_sequence (header)); | |
693 | for (i = 0; i < len; i++) | |
694 | LGSTRING_SET_GLYPH (copy, i, Fcopy_sequence (LGSTRING_GLYPH (gstring, i))); | |
695 | i = hash_put (h, LGSTRING_HEADER (copy), copy, hash); | |
696 | LGSTRING_SET_ID (copy, make_number (i)); | |
697 | return copy; | |
698 | } | |
699 | ||
700 | Lisp_Object | |
701 | composition_gstring_from_id (id) | |
702 | int id; | |
703 | { | |
704 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
705 | ||
706 | return HASH_VALUE (h, id); | |
707 | } | |
708 | ||
709 | static Lisp_Object fill_gstring_header P_ ((Lisp_Object, Lisp_Object, | |
710 | Lisp_Object, Lisp_Object, | |
711 | Lisp_Object)); | |
712 | ||
713 | int | |
714 | composition_gstring_p (gstring) | |
715 | Lisp_Object gstring; | |
716 | { | |
717 | Lisp_Object header; | |
718 | int i; | |
719 | ||
720 | if (! VECTORP (gstring) || ASIZE (gstring) < 2) | |
721 | return 0; | |
722 | header = LGSTRING_HEADER (gstring); | |
723 | if (! VECTORP (header) || ASIZE (header) < 2) | |
724 | return 0; | |
725 | if (! NILP (LGSTRING_FONT (gstring)) | |
726 | && ! FONT_OBJECT_P (LGSTRING_FONT (gstring))) | |
727 | return 0; | |
728 | for (i = 1; i < ASIZE (LGSTRING_HEADER (gstring)); i++) | |
729 | if (! NATNUMP (AREF (LGSTRING_HEADER (gstring), i))) | |
730 | return 0; | |
731 | if (! NILP (LGSTRING_ID (gstring)) && ! NATNUMP (LGSTRING_ID (gstring))) | |
732 | return 0; | |
733 | for (i = 0; i < LGSTRING_GLYPH_LEN (gstring); i++) | |
734 | { | |
735 | Lisp_Object glyph = LGSTRING_GLYPH (gstring, i); | |
736 | if (NILP (glyph)) | |
737 | break; | |
738 | if (! VECTORP (glyph) || ASIZE (glyph) != LGLYPH_SIZE) | |
739 | return 0; | |
740 | } | |
741 | return 1; | |
742 | } | |
743 | ||
744 | int | |
745 | composition_gstring_width (gstring, from, to, metrics) | |
746 | Lisp_Object gstring; | |
747 | int from, to; | |
748 | struct font_metrics *metrics; | |
749 | { | |
750 | Lisp_Object *glyph; | |
751 | int width = 0; | |
752 | ||
753 | if (metrics) | |
754 | { | |
755 | Lisp_Object font_object = LGSTRING_FONT (gstring); | |
756 | struct font *font = XFONT_OBJECT (font_object); | |
757 | ||
758 | metrics->ascent = font->ascent; | |
759 | metrics->descent = font->descent; | |
760 | metrics->width = metrics->lbearing = metrics->rbearing = 0; | |
761 | } | |
762 | for (glyph = &LGSTRING_GLYPH (gstring, from); from < to; from++, glyph++) | |
763 | { | |
764 | int x; | |
765 | ||
766 | if (NILP (LGLYPH_ADJUSTMENT (*glyph))) | |
767 | width += LGLYPH_WIDTH (*glyph); | |
768 | else | |
769 | width += LGLYPH_WADJUST (*glyph); | |
770 | if (metrics) | |
771 | { | |
772 | x = metrics->width + LGLYPH_LBEARING (*glyph) + LGLYPH_XOFF (*glyph); | |
773 | if (metrics->lbearing > x) | |
774 | metrics->lbearing = x; | |
775 | x = metrics->width + LGLYPH_RBEARING (*glyph) + LGLYPH_XOFF (*glyph); | |
776 | if (metrics->rbearing < x) | |
777 | metrics->rbearing = x; | |
778 | metrics->width = width; | |
779 | x = LGLYPH_ASCENT (*glyph) - LGLYPH_YOFF (*glyph); | |
780 | if (metrics->ascent < x) | |
781 | metrics->ascent = x; | |
782 | x = LGLYPH_DESCENT (*glyph) - LGLYPH_YOFF (*glyph); | |
783 | if (metrics->descent < x) | |
784 | metrics->descent = x; | |
785 | } | |
786 | } | |
787 | return width; | |
788 | } | |
789 | ||
790 | ||
791 | static Lisp_Object gstring_work; | |
792 | static Lisp_Object gstring_work_headers; | |
793 | ||
794 | static Lisp_Object | |
795 | fill_gstring_header (header, start, end, font_object, string) | |
796 | Lisp_Object header, start, end, font_object, string; | |
797 | { | |
798 | EMACS_INT from, to, from_byte; | |
799 | EMACS_INT len, i; | |
800 | ||
801 | if (NILP (string)) | |
802 | { | |
803 | if (NILP (current_buffer->enable_multibyte_characters)) | |
804 | error ("Attempt to shape unibyte text"); | |
805 | validate_region (&start, &end); | |
806 | from = XFASTINT (start); | |
807 | to = XFASTINT (end); | |
808 | from_byte = CHAR_TO_BYTE (from); | |
809 | } | |
810 | else | |
811 | { | |
812 | CHECK_STRING (string); | |
813 | if (! STRING_MULTIBYTE (current_buffer->enable_multibyte_characters)) | |
814 | error ("Attempt to shape unibyte text"); | |
815 | CHECK_NATNUM (start); | |
816 | from = XINT (start); | |
817 | CHECK_NATNUM (end); | |
818 | to = XINT (end); | |
819 | if (from < 0 || from > to || to > SCHARS (string)) | |
820 | args_out_of_range_3 (string, start, end); | |
821 | from_byte = string_char_to_byte (string, from); | |
822 | } | |
823 | ||
824 | len = to - from; | |
825 | if (len == 0) | |
826 | error ("Attempt to shape zero-length text"); | |
827 | if (VECTORP (header)) | |
828 | { | |
829 | if (ASIZE (header) != len + 1) | |
830 | args_out_of_range (header, make_number (len + 1)); | |
831 | } | |
832 | else | |
833 | { | |
834 | if (len <= 8) | |
835 | header = AREF (gstring_work_headers, len - 1); | |
836 | else | |
837 | header = Fmake_vector (make_number (len + 1), Qnil); | |
838 | } | |
839 | ||
840 | ASET (header, 0, font_object); | |
841 | for (i = 0; i < len; i++) | |
842 | { | |
843 | int c; | |
844 | ||
845 | if (NILP (string)) | |
846 | FETCH_CHAR_ADVANCE_NO_CHECK (c, from, from_byte); | |
847 | else | |
848 | FETCH_STRING_CHAR_ADVANCE_NO_CHECK (c, string, from, from_byte); | |
849 | ASET (header, i + 1, make_number (c)); | |
850 | } | |
851 | return header; | |
852 | } | |
853 | ||
854 | extern void font_fill_lglyph_metrics P_ ((Lisp_Object, Lisp_Object)); | |
855 | ||
856 | static void | |
857 | fill_gstring_body (gstring) | |
858 | Lisp_Object gstring; | |
859 | { | |
860 | Lisp_Object font_object = LGSTRING_FONT (gstring); | |
861 | Lisp_Object header = AREF (gstring, 0); | |
862 | EMACS_INT len = LGSTRING_CHAR_LEN (gstring); | |
863 | EMACS_INT i; | |
864 | ||
865 | for (i = 0; i < len; i++) | |
866 | { | |
867 | Lisp_Object g = LGSTRING_GLYPH (gstring, i); | |
868 | int c = XINT (AREF (header, i + 1)); | |
869 | ||
870 | if (NILP (g)) | |
871 | { | |
872 | g = LGLYPH_NEW (); | |
873 | LGSTRING_SET_GLYPH (gstring, i, g); | |
874 | } | |
875 | LGLYPH_SET_FROM (g, i); | |
876 | LGLYPH_SET_TO (g, i); | |
877 | LGLYPH_SET_CHAR (g, c); | |
878 | if (! NILP (font_object)) | |
879 | { | |
880 | font_fill_lglyph_metrics (g, font_object); | |
881 | } | |
882 | else | |
883 | { | |
884 | int width = XFASTINT (CHAR_TABLE_REF (Vchar_width_table, c)); | |
885 | ||
886 | LGLYPH_SET_CODE (g, c); | |
887 | LGLYPH_SET_LBEARING (g, 0); | |
888 | LGLYPH_SET_RBEARING (g, width); | |
889 | LGLYPH_SET_WIDTH (g, width); | |
890 | LGLYPH_SET_ASCENT (g, 1); | |
891 | LGLYPH_SET_DESCENT (g, 0); | |
892 | } | |
893 | LGLYPH_SET_ADJUSTMENT (g, Qnil); | |
894 | } | |
895 | if (i < LGSTRING_GLYPH_LEN (gstring)) | |
896 | LGSTRING_SET_GLYPH (gstring, i, Qnil); | |
897 | } | |
898 | ||
899 | EXFUN (Fre_search_forward, 4); | |
900 | ||
901 | /* Try to compose the characters at CHARPOS according to CFT_ELEMENT | |
902 | which is an element of composition-fucntion-table (which see). | |
903 | LIMIT limits the characters to compose. STRING, if not nil, is a | |
904 | target string. WIN is a window where the characters are being | |
905 | displayed. */ | |
906 | ||
907 | static Lisp_Object | |
908 | autocmp_chars (cft_element, charpos, bytepos, limit, win, face, string) | |
909 | Lisp_Object cft_element; | |
910 | EMACS_INT charpos, bytepos, limit; | |
911 | struct window *win; | |
912 | struct face *face; | |
913 | Lisp_Object string; | |
914 | { | |
915 | int count = SPECPDL_INDEX (); | |
916 | FRAME_PTR f = XFRAME (win->frame); | |
917 | Lisp_Object pos = make_number (charpos); | |
918 | EMACS_INT pt = PT, pt_byte = PT_BYTE; | |
919 | ||
920 | record_unwind_save_match_data (); | |
921 | for (; CONSP (cft_element); cft_element = XCDR (cft_element)) | |
922 | { | |
923 | Lisp_Object elt = XCAR (cft_element); | |
924 | Lisp_Object re; | |
925 | Lisp_Object font_object = Qnil, gstring; | |
926 | EMACS_INT to; | |
927 | ||
928 | if (! VECTORP (elt) || ASIZE (elt) != 3) | |
929 | continue; | |
930 | re = AREF (elt, 0); | |
931 | if (NILP (string)) | |
932 | TEMP_SET_PT_BOTH (charpos, bytepos); | |
933 | if (NILP (re) | |
934 | || (STRINGP (re) | |
935 | && (STRINGP (string) | |
936 | ? EQ (Fstring_match (re, string, pos), pos) | |
937 | : (! NILP (Fre_search_forward (re, make_number (limit), Qt, Qnil)) | |
938 | && EQ (Fmatch_beginning (make_number (0)), pos))))) | |
939 | { | |
940 | to = (NILP (re) ? charpos + 1 : XINT (Fmatch_end (make_number (0)))); | |
941 | #ifdef HAVE_WINDOW_SYSTEM | |
942 | if (FRAME_WINDOW_P (f)) | |
943 | { | |
944 | font_object = font_range (charpos, &to, win, face, string); | |
945 | if (! FONT_OBJECT_P (font_object)) | |
946 | { | |
947 | if (NILP (string)) | |
948 | TEMP_SET_PT_BOTH (pt, pt_byte); | |
949 | return unbind_to (count, Qnil); | |
950 | } | |
951 | } | |
952 | #endif /* not HAVE_WINDOW_SYSTEM */ | |
953 | gstring = Fcomposition_get_gstring (pos, make_number (to), | |
954 | font_object, string); | |
955 | if (NILP (LGSTRING_ID (gstring))) | |
956 | { | |
957 | Lisp_Object args[6]; | |
958 | ||
959 | args[0] = Vauto_composition_function; | |
960 | args[1] = AREF (elt, 2); | |
961 | args[2] = pos; | |
962 | args[3] = make_number (to); | |
963 | args[4] = font_object; | |
964 | args[5] = string; | |
965 | gstring = safe_call (6, args); | |
966 | } | |
967 | if (NILP (string)) | |
968 | TEMP_SET_PT_BOTH (pt, pt_byte); | |
969 | return unbind_to (count, gstring); | |
970 | } | |
971 | } | |
972 | if (NILP (string)) | |
973 | TEMP_SET_PT_BOTH (pt, pt_byte); | |
974 | return unbind_to (count, Qnil); | |
975 | } | |
976 | ||
977 | ||
978 | /* Update cmp_it->stop_pos to the next position after CHARPOS (and | |
979 | BYTEPOS) where character composition may happen. If BYTEPOS is | |
980 | negative, compoute it. If it is a static composition, set | |
981 | cmp_it->ch to -1. Otherwise, set cmp_it->ch to the character that | |
982 | triggers a automatic composition. */ | |
983 | ||
984 | void | |
985 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string) | |
986 | struct composition_it *cmp_it; | |
987 | EMACS_INT charpos, bytepos, endpos; | |
988 | Lisp_Object string; | |
989 | { | |
990 | EMACS_INT start, end, c; | |
991 | Lisp_Object prop, val; | |
992 | ||
993 | cmp_it->stop_pos = endpos; | |
994 | if (find_composition (charpos, endpos, &start, &end, &prop, string) | |
995 | && COMPOSITION_VALID_P (start, end, prop)) | |
996 | { | |
997 | cmp_it->stop_pos = endpos = start; | |
998 | cmp_it->ch = -1; | |
999 | } | |
1000 | if (NILP (current_buffer->enable_multibyte_characters) | |
1001 | || ! FUNCTIONP (Vauto_composition_function)) | |
1002 | return; | |
1003 | if (bytepos < 0) | |
1004 | { | |
1005 | if (STRINGP (string)) | |
1006 | bytepos = string_char_to_byte (string, charpos); | |
1007 | else | |
1008 | bytepos = CHAR_TO_BYTE (charpos); | |
1009 | } | |
1010 | ||
1011 | start = charpos; | |
1012 | while (charpos < endpos) | |
1013 | { | |
1014 | if (STRINGP (string)) | |
1015 | FETCH_STRING_CHAR_ADVANCE (c, string, charpos, bytepos); | |
1016 | else | |
1017 | FETCH_CHAR_ADVANCE (c, charpos, bytepos); | |
1018 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1019 | if (! NILP (val)) | |
1020 | { | |
1021 | Lisp_Object elt; | |
1022 | ||
1023 | for (; CONSP (val); val = XCDR (val)) | |
1024 | { | |
1025 | elt = XCAR (val); | |
1026 | if (VECTORP (elt) && ASIZE (elt) == 3 && NATNUMP (AREF (elt, 1)) | |
1027 | && charpos - 1 - XFASTINT (AREF (elt, 1)) >= start) | |
1028 | break; | |
1029 | } | |
1030 | if (CONSP (val)) | |
1031 | { | |
1032 | cmp_it->stop_pos = charpos - 1 - XFASTINT (AREF (elt, 1)); | |
1033 | cmp_it->ch = c; | |
1034 | break; | |
1035 | } | |
1036 | } | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /* Check if the character at CHARPOS (and BYTEPOS) is composed | |
1041 | (possibly with the following charaters) on window W. ENDPOS limits | |
1042 | characters to be composed. FACE, in non-NULL, is a base face of | |
1043 | the character. If STRING is not nil, it is a string containing the | |
1044 | character to check, and CHARPOS and BYTEPOS are indices in the | |
1045 | string. In that case, FACE must not be NULL. | |
1046 | ||
1047 | If the character is composed, setup members of CMP_IT (id, nglyphs, | |
1048 | and from), and return 1. Otherwise, update CMP_IT->stop_pos, and | |
1049 | return 0. */ | |
1050 | ||
1051 | int | |
1052 | composition_reseat_it (cmp_it, charpos, bytepos, endpos, w, face, string) | |
1053 | struct composition_it *cmp_it; | |
1054 | EMACS_INT charpos, bytepos, endpos; | |
1055 | struct window *w; | |
1056 | struct face *face; | |
1057 | Lisp_Object string; | |
1058 | { | |
1059 | if (cmp_it->ch < 0) | |
1060 | { | |
1061 | /* We are looking at a static composition. */ | |
1062 | EMACS_INT start, end; | |
1063 | Lisp_Object prop; | |
1064 | ||
1065 | find_composition (charpos, -1, &start, &end, &prop, string); | |
1066 | cmp_it->id = get_composition_id (charpos, bytepos, end - start, | |
1067 | prop, string); | |
1068 | if (cmp_it->id < 0) | |
1069 | goto no_composition; | |
1070 | cmp_it->nchars = end - start; | |
1071 | cmp_it->nglyphs = composition_table[cmp_it->id]->glyph_len; | |
1072 | } | |
1073 | else | |
1074 | { | |
1075 | Lisp_Object val; | |
1076 | int i; | |
1077 | ||
1078 | val = CHAR_TABLE_REF (Vcomposition_function_table, cmp_it->ch); | |
1079 | if (NILP (val)) | |
1080 | goto no_composition; | |
1081 | val = autocmp_chars (val, charpos, bytepos, endpos, w, face, string); | |
1082 | if (! composition_gstring_p (val)) | |
1083 | goto no_composition; | |
1084 | if (NILP (LGSTRING_ID (val))) | |
1085 | val = composition_gstring_put_cache (val, -1); | |
1086 | cmp_it->id = XINT (LGSTRING_ID (val)); | |
1087 | for (i = 0; i < LGSTRING_GLYPH_LEN (val); i++) | |
1088 | if (NILP (LGSTRING_GLYPH (val, i))) | |
1089 | break; | |
1090 | cmp_it->nglyphs = i; | |
1091 | } | |
1092 | cmp_it->from = 0; | |
1093 | return 1; | |
1094 | ||
1095 | no_composition: | |
1096 | charpos++; | |
1097 | if (STRINGP (string)) | |
1098 | bytepos += MULTIBYTE_LENGTH_NO_CHECK (SDATA (string) + bytepos); | |
1099 | else | |
1100 | INC_POS (bytepos); | |
1101 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string); | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | int | |
1106 | composition_update_it (cmp_it, charpos, bytepos, string) | |
1107 | struct composition_it *cmp_it; | |
1108 | EMACS_INT charpos, bytepos; | |
1109 | Lisp_Object string; | |
1110 | { | |
1111 | int i, c; | |
1112 | ||
1113 | if (cmp_it->ch < 0) | |
1114 | { | |
1115 | struct composition *cmp = composition_table[cmp_it->id]; | |
1116 | ||
1117 | cmp_it->to = cmp_it->nglyphs; | |
1118 | if (cmp_it->nglyphs == 0) | |
1119 | c = -1; | |
1120 | else | |
1121 | { | |
1122 | for (i = 0; i < cmp->glyph_len; i++) | |
1123 | if ((c = COMPOSITION_GLYPH (cmp, i)) != '\t') | |
1124 | break; | |
1125 | if (c == '\t') | |
1126 | c = ' '; | |
1127 | } | |
1128 | cmp_it->width = cmp->width; | |
1129 | } | |
1130 | else | |
1131 | { | |
1132 | Lisp_Object gstring = composition_gstring_from_id (cmp_it->id); | |
1133 | ||
1134 | if (cmp_it->nglyphs == 0) | |
1135 | { | |
1136 | c = -1; | |
1137 | cmp_it->nchars = LGSTRING_CHAR_LEN (gstring); | |
1138 | cmp_it->width = 0; | |
1139 | } | |
1140 | else | |
1141 | { | |
1142 | Lisp_Object glyph = LGSTRING_GLYPH (gstring, cmp_it->from); | |
1143 | int from = LGLYPH_FROM (glyph); | |
1144 | ||
1145 | c = LGSTRING_CHAR (gstring, from); | |
1146 | cmp_it->nchars = LGLYPH_TO (glyph) - from + 1; | |
1147 | cmp_it->width = (LGLYPH_WIDTH (glyph) > 0 | |
1148 | ? CHAR_WIDTH (LGLYPH_CHAR (glyph)) : 0); | |
1149 | for (cmp_it->to = cmp_it->from + 1; cmp_it->to < cmp_it->nglyphs; | |
1150 | cmp_it->to++) | |
1151 | { | |
1152 | glyph = LGSTRING_GLYPH (gstring, cmp_it->to); | |
1153 | if (LGLYPH_FROM (glyph) != from) | |
1154 | break; | |
1155 | if (LGLYPH_WIDTH (glyph) > 0) | |
1156 | cmp_it->width += CHAR_WIDTH (LGLYPH_CHAR (glyph)); | |
1157 | } | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | charpos += cmp_it->nchars; | |
1162 | if (STRINGP (string)) | |
1163 | cmp_it->nbytes = string_char_to_byte (string, charpos) - bytepos; | |
1164 | else | |
1165 | cmp_it->nbytes = CHAR_TO_BYTE (charpos) - bytepos; | |
1166 | return c; | |
1167 | } | |
1168 | ||
1169 | ||
1170 | int | |
1171 | composition_adjust_point (last_pt) | |
1172 | EMACS_INT last_pt; | |
1173 | { | |
1174 | /* Now check the automatic composition. */ | |
1175 | EMACS_INT charpos, bytepos, startpos, beg, end, pos; | |
1176 | Lisp_Object val, cat; | |
1177 | EMACS_INT limit; | |
1178 | int c; | |
1179 | ||
1180 | if (PT == BEGV || PT == ZV) | |
1181 | return PT; | |
1182 | ||
1183 | if (get_property_and_range (PT, Qcomposition, &val, &beg, &end, Qnil) | |
1184 | && COMPOSITION_VALID_P (beg, end, val) | |
1185 | && beg < PT /* && end > PT <- It's always the case. */ | |
1186 | && (last_pt <= beg || last_pt >= end)) | |
1187 | return (PT < last_pt ? beg : end); | |
1188 | ||
1189 | if (NILP (current_buffer->enable_multibyte_characters) | |
1190 | || ! FUNCTIONP (Vauto_composition_function)) | |
1191 | return PT; | |
1192 | ||
1193 | c = FETCH_MULTIBYTE_CHAR (PT_BYTE); | |
1194 | cat = CHAR_TABLE_REF (Vunicode_category_table, c); | |
1195 | if (SYMBOLP (cat) | |
1196 | && ((c = SDATA (SYMBOL_NAME (cat))[0]) == 'C' || c == 'Z')) | |
1197 | /* A control character is never composed. */ | |
1198 | return PT; | |
1199 | ||
1200 | charpos = PT; | |
1201 | bytepos = PT_BYTE; | |
1202 | limit = (last_pt < PT ? last_pt : BEGV); | |
1203 | do { | |
1204 | DEC_BOTH (charpos, bytepos); | |
1205 | c = FETCH_MULTIBYTE_CHAR (bytepos); | |
1206 | cat = CHAR_TABLE_REF (Vunicode_category_table, c); | |
1207 | if (SYMBOLP (cat) | |
1208 | && ((c = SDATA (SYMBOL_NAME (cat))[0]) == 'C' || c == 'Z')) | |
1209 | { | |
1210 | INC_BOTH (charpos, bytepos); | |
1211 | break; | |
1212 | } | |
1213 | } while (charpos > limit); | |
1214 | ||
1215 | ||
1216 | limit = (last_pt < PT ? ZV : last_pt); | |
1217 | if (limit > PT + 3) | |
1218 | limit = PT + 3; | |
1219 | startpos = charpos; | |
1220 | while (charpos < limit) | |
1221 | { | |
1222 | c = FETCH_MULTIBYTE_CHAR (bytepos); | |
1223 | if (charpos > PT) | |
1224 | { | |
1225 | int ch; | |
1226 | ||
1227 | cat = CHAR_TABLE_REF (Vunicode_category_table, c); | |
1228 | if (SYMBOLP (cat) | |
1229 | && ((ch = SDATA (SYMBOL_NAME (cat))[0]) == 'C' || ch == 'Z')) | |
1230 | return PT; | |
1231 | } | |
1232 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1233 | if (! CONSP (val)) | |
1234 | { | |
1235 | INC_BOTH (charpos, bytepos); | |
1236 | continue; | |
1237 | } | |
1238 | for (; CONSP (val); val = XCDR (val)) | |
1239 | { | |
1240 | Lisp_Object elt = XCAR (val); | |
1241 | ||
1242 | if (VECTORP (elt) && ASIZE (elt) == 3 && NATNUMP (AREF (elt, 1)) | |
1243 | && (pos = charpos - XFASTINT (AREF (elt, 1))) < PT | |
1244 | && pos >= startpos) | |
1245 | { | |
1246 | Lisp_Object gstring; | |
1247 | EMACS_INT pos_byte; | |
1248 | ||
1249 | if (XFASTINT (AREF (elt, 1)) == 0) | |
1250 | pos_byte = bytepos; | |
1251 | else | |
1252 | pos_byte = CHAR_TO_BYTE (pos); | |
1253 | gstring = autocmp_chars (val, pos, pos_byte, Z, | |
1254 | XWINDOW (selected_window), NULL, Qnil); | |
1255 | if (composition_gstring_p (gstring)) | |
1256 | { | |
1257 | if (pos + LGSTRING_CHAR_LEN (gstring) > PT) | |
1258 | { | |
1259 | int i; | |
1260 | ||
1261 | for (i = 0; i < LGSTRING_GLYPH_LEN (gstring); i++) | |
1262 | { | |
1263 | Lisp_Object glyph = LGSTRING_GLYPH (gstring, i); | |
1264 | ||
1265 | if (NILP (glyph)) | |
1266 | break; | |
1267 | if (pos + LGLYPH_FROM (glyph) == PT) | |
1268 | return PT; | |
1269 | if (pos + LGLYPH_TO (glyph) + 1 > PT) | |
1270 | return (PT < last_pt | |
1271 | ? pos + LGLYPH_FROM (glyph) | |
1272 | : pos + LGLYPH_TO (glyph) + 1); | |
1273 | } | |
1274 | return PT; | |
1275 | } | |
1276 | charpos = startpos = pos + LGSTRING_CHAR_LEN (gstring); | |
1277 | bytepos = CHAR_TO_BYTE (charpos); | |
1278 | break; | |
1279 | } | |
1280 | } | |
1281 | } | |
1282 | if (! CONSP (val)) | |
1283 | INC_BOTH (charpos, bytepos); | |
1284 | } | |
1285 | return PT; | |
1286 | } | |
1287 | ||
1288 | DEFUN ("composition-get-gstring", Fcomposition_get_gstring, | |
1289 | Scomposition_get_gstring, 4, 4, 0, | |
1290 | doc: /* Return a glyph-string for characters between FROM and TO. | |
1291 | If the glhph string is for graphic display, FONT-OBJECT must be | |
1292 | a font-object to use for those characters. | |
1293 | Otherwise (for terminal display), FONT-OBJECT must be nil. | |
1294 | ||
1295 | If the optional 4th argument STRING is not nil, it is a string | |
1296 | containing the target characters between indices FROM and TO. | |
1297 | ||
1298 | A glhph-string is a vector containing information about how to display | |
1299 | specific character sequence. The format is: | |
1300 | [HEADER ID GLYPH ...] | |
1301 | ||
1302 | HEADER is a vector of this form: | |
1303 | [FONT-OBJECT CHAR ...] | |
1304 | where | |
1305 | FONT-OBJECT is a font-object for all glyphs in the glyph-string, | |
1306 | or nil if not yet decided. | |
1307 | CHARs are characters to be composed by GLYPHs. | |
1308 | ||
1309 | ID is an identification number of the glyph-string. It may be nil if | |
1310 | not yet shaped. | |
1311 | ||
1312 | GLYPH is a vector whose elements has this form: | |
1313 | [ FROM-IDX TO-IDX C CODE WIDTH LBEARING RBEARING ASCENT DESCENT | |
1314 | [ [X-OFF Y-OFF WADJUST] | nil] ] | |
1315 | where | |
1316 | FROM-IDX and TO-IDX are used internally and should not be touched. | |
1317 | C is the character of the glyph. | |
1318 | CODE is the glyph-code of C in FONT-OBJECT. | |
1319 | WIDTH thru DESCENT are the metrics (in pixels) of the glyph. | |
1320 | X-OFF and Y-OFF are offests to the base position for the glyph. | |
1321 | WADJUST is the adjustment to the normal width of the glyph. | |
1322 | ||
1323 | If GLYPH is nil, the remaining elements of the glhph-string vector | |
1324 | must be ignore. */) | |
1325 | (from, to, font_object, string) | |
1326 | Lisp_Object font_object, from, to, string; | |
1327 | { | |
1328 | Lisp_Object gstring, header; | |
1329 | ||
1330 | if (! NILP (font_object)) | |
1331 | CHECK_FONT_OBJECT (font_object); | |
1332 | header = fill_gstring_header (Qnil, from, to, font_object, string); | |
1333 | gstring = gstring_lookup_cache (header); | |
1334 | if (! NILP (gstring)) | |
1335 | return gstring; | |
1336 | LGSTRING_SET_HEADER (gstring_work, header); | |
1337 | LGSTRING_SET_ID (gstring_work, Qnil); | |
1338 | fill_gstring_body (gstring_work); | |
1339 | return gstring_work; | |
1340 | } | |
1341 | ||
ca4c9455 KH |
1342 | \f |
1343 | /* Emacs Lisp APIs. */ | |
1344 | ||
1345 | DEFUN ("compose-region-internal", Fcompose_region_internal, | |
1346 | Scompose_region_internal, 2, 4, 0, | |
335c5470 PJ |
1347 | doc: /* Internal use only. |
1348 | ||
1349 | Compose text in the region between START and END. | |
1350 | Optional 3rd and 4th arguments are COMPONENTS and MODIFICATION-FUNC | |
9baf7418 | 1351 | for the composition. See `compose-region' for more detail. */) |
d562f8ab JB |
1352 | (start, end, components, modification_func) |
1353 | Lisp_Object start, end, components, modification_func; | |
ca4c9455 KH |
1354 | { |
1355 | validate_region (&start, &end); | |
1356 | if (!NILP (components) | |
1357 | && !INTEGERP (components) | |
1358 | && !CONSP (components) | |
1359 | && !STRINGP (components)) | |
b7826503 | 1360 | CHECK_VECTOR (components); |
ca4c9455 | 1361 | |
d562f8ab | 1362 | compose_text (XINT (start), XINT (end), components, modification_func, Qnil); |
ca4c9455 KH |
1363 | return Qnil; |
1364 | } | |
1365 | ||
1366 | DEFUN ("compose-string-internal", Fcompose_string_internal, | |
1367 | Scompose_string_internal, 3, 5, 0, | |
335c5470 PJ |
1368 | doc: /* Internal use only. |
1369 | ||
1370 | Compose text between indices START and END of STRING. | |
1371 | Optional 4th and 5th arguments are COMPONENTS and MODIFICATION-FUNC | |
9baf7418 | 1372 | for the composition. See `compose-string' for more detail. */) |
d562f8ab JB |
1373 | (string, start, end, components, modification_func) |
1374 | Lisp_Object string, start, end, components, modification_func; | |
ca4c9455 | 1375 | { |
b7826503 PJ |
1376 | CHECK_STRING (string); |
1377 | CHECK_NUMBER (start); | |
1378 | CHECK_NUMBER (end); | |
ca4c9455 KH |
1379 | |
1380 | if (XINT (start) < 0 || | |
1381 | XINT (start) > XINT (end) | |
d5db4077 | 1382 | || XINT (end) > SCHARS (string)) |
ca4c9455 KH |
1383 | args_out_of_range (start, end); |
1384 | ||
d562f8ab | 1385 | compose_text (XINT (start), XINT (end), components, modification_func, string); |
ca4c9455 KH |
1386 | return string; |
1387 | } | |
1388 | ||
1389 | DEFUN ("find-composition-internal", Ffind_composition_internal, | |
177c0ea7 | 1390 | Sfind_composition_internal, 4, 4, 0, |
335c5470 PJ |
1391 | doc: /* Internal use only. |
1392 | ||
1393 | Return information about composition at or nearest to position POS. | |
1394 | See `find-composition' for more detail. */) | |
1395 | (pos, limit, string, detail_p) | |
ca4c9455 KH |
1396 | Lisp_Object pos, limit, string, detail_p; |
1397 | { | |
1398 | Lisp_Object prop, tail; | |
aaefca97 | 1399 | EMACS_INT start, end; |
ca4c9455 KH |
1400 | int id; |
1401 | ||
b7826503 | 1402 | CHECK_NUMBER_COERCE_MARKER (pos); |
ca4c9455 KH |
1403 | start = XINT (pos); |
1404 | if (!NILP (limit)) | |
1405 | { | |
b7826503 | 1406 | CHECK_NUMBER_COERCE_MARKER (limit); |
ca4c9455 KH |
1407 | end = XINT (limit); |
1408 | } | |
1409 | else | |
1410 | end = -1; | |
177c0ea7 | 1411 | |
ca4c9455 | 1412 | if (!NILP (string)) |
e3b3e327 | 1413 | { |
b7826503 | 1414 | CHECK_STRING (string); |
d5db4077 | 1415 | if (XINT (pos) < 0 || XINT (pos) > SCHARS (string)) |
e3b3e327 GM |
1416 | args_out_of_range (string, pos); |
1417 | } | |
1418 | else | |
1419 | { | |
fa9090b8 | 1420 | if (XINT (pos) < BEGV || XINT (pos) > ZV) |
e3b3e327 GM |
1421 | args_out_of_range (Fcurrent_buffer (), pos); |
1422 | } | |
ca4c9455 KH |
1423 | |
1424 | if (!find_composition (start, end, &start, &end, &prop, string)) | |
1425 | return Qnil; | |
1426 | if (!COMPOSITION_VALID_P (start, end, prop)) | |
1427 | return Fcons (make_number (start), Fcons (make_number (end), | |
1428 | Fcons (Qnil, Qnil))); | |
1429 | if (NILP (detail_p)) | |
1430 | return Fcons (make_number (start), Fcons (make_number (end), | |
1431 | Fcons (Qt, Qnil))); | |
1432 | ||
1433 | if (COMPOSITION_REGISTERD_P (prop)) | |
1434 | id = COMPOSITION_ID (prop); | |
1435 | else | |
1436 | { | |
1437 | int start_byte = (NILP (string) | |
1438 | ? CHAR_TO_BYTE (start) | |
1439 | : string_char_to_byte (string, start)); | |
1440 | id = get_composition_id (start, start_byte, end - start, prop, string); | |
1441 | } | |
1442 | ||
1443 | if (id >= 0) | |
1444 | { | |
1445 | Lisp_Object components, relative_p, mod_func; | |
1446 | enum composition_method method = COMPOSITION_METHOD (prop); | |
1447 | int width = composition_table[id]->width; | |
1448 | ||
1449 | components = Fcopy_sequence (COMPOSITION_COMPONENTS (prop)); | |
1450 | relative_p = (method == COMPOSITION_WITH_RULE_ALTCHARS | |
1451 | ? Qnil : Qt); | |
1452 | mod_func = COMPOSITION_MODIFICATION_FUNC (prop); | |
1453 | tail = Fcons (components, | |
1454 | Fcons (relative_p, | |
1455 | Fcons (mod_func, | |
1456 | Fcons (make_number (width), Qnil)))); | |
1457 | } | |
1458 | else | |
1459 | tail = Qnil; | |
1460 | ||
1461 | return Fcons (make_number (start), Fcons (make_number (end), tail)); | |
1462 | } | |
1463 | ||
1464 | \f | |
1465 | void | |
1466 | syms_of_composite () | |
1467 | { | |
58753d74 KH |
1468 | int i; |
1469 | ||
ca4c9455 KH |
1470 | Qcomposition = intern ("composition"); |
1471 | staticpro (&Qcomposition); | |
1472 | ||
58753d74 | 1473 | /* Make a hash table for static composition. */ |
ca4c9455 | 1474 | { |
09654086 | 1475 | Lisp_Object args[6]; |
ca4c9455 | 1476 | extern Lisp_Object QCsize; |
177c0ea7 | 1477 | |
ca4c9455 KH |
1478 | args[0] = QCtest; |
1479 | args[1] = Qequal; | |
1480 | args[2] = QCweakness; | |
dc47eccc | 1481 | /* We used to make the hash table weak so that unreferenced |
ca101cff | 1482 | compositions can be garbage-collected. But, usually once |
dc47eccc KH |
1483 | created compositions are repeatedly used in an Emacs session, |
1484 | and thus it's not worth to save memory in such a way. So, we | |
1485 | make the table not weak. */ | |
6a83ee8a | 1486 | args[3] = Qnil; |
ca4c9455 KH |
1487 | args[4] = QCsize; |
1488 | args[5] = make_number (311); | |
09654086 | 1489 | composition_hash_table = Fmake_hash_table (6, args); |
ca4c9455 KH |
1490 | staticpro (&composition_hash_table); |
1491 | } | |
1492 | ||
58753d74 KH |
1493 | /* Make a hash table for glyph-string. */ |
1494 | { | |
1495 | Lisp_Object args[6]; | |
1496 | extern Lisp_Object QCsize; | |
1497 | ||
1498 | args[0] = QCtest; | |
1499 | args[1] = Qequal; | |
1500 | args[2] = QCweakness; | |
1501 | args[3] = Qnil; | |
1502 | args[4] = QCsize; | |
1503 | args[5] = make_number (311); | |
1504 | gstring_hash_table = Fmake_hash_table (6, args); | |
1505 | staticpro (&gstring_hash_table); | |
1506 | } | |
1507 | ||
1508 | staticpro (&gstring_work_headers); | |
1509 | gstring_work_headers = Fmake_vector (make_number (8), Qnil); | |
1510 | for (i = 0; i < 8; i++) | |
1511 | ASET (gstring_work_headers, i, Fmake_vector (make_number (i + 2), Qnil)); | |
1512 | staticpro (&gstring_work); | |
1513 | gstring_work = Fmake_vector (make_number (10), Qnil); | |
1514 | ||
ca4c9455 KH |
1515 | /* Text property `composition' should be nonsticky by default. */ |
1516 | Vtext_property_default_nonsticky | |
1517 | = Fcons (Fcons (Qcomposition, Qt), Vtext_property_default_nonsticky); | |
1518 | ||
1519 | DEFVAR_LISP ("compose-chars-after-function", &Vcompose_chars_after_function, | |
335c5470 PJ |
1520 | doc: /* Function to adjust composition of buffer text. |
1521 | ||
1522 | The function is called with three arguments FROM, TO, and OBJECT. | |
1523 | FROM and TO specify the range of text of which composition should be | |
1524 | adjusted. OBJECT, if non-nil, is a string that contains the text. | |
1525 | ||
1526 | This function is called after a text with `composition' property is | |
1527 | inserted or deleted to keep `composition' property of buffer text | |
1528 | valid. | |
1529 | ||
1530 | The default value is the function `compose-chars-after'. */); | |
ca4c9455 KH |
1531 | Vcompose_chars_after_function = intern ("compose-chars-after"); |
1532 | ||
f96ba4c1 KH |
1533 | Qauto_composed = intern ("auto-composed"); |
1534 | staticpro (&Qauto_composed); | |
40add26d | 1535 | |
f96ba4c1 KH |
1536 | Qauto_composition_function = intern ("auto-composition-function"); |
1537 | staticpro (&Qauto_composition_function); | |
40add26d | 1538 | |
f96ba4c1 KH |
1539 | DEFVAR_LISP ("auto-composition-function", &Vauto_composition_function, |
1540 | doc: /* Function to call to compose characters automatically. | |
ddc872ba KH |
1541 | The function is called from the display routine with four arguments, |
1542 | FROM, TO, WINDOW, and STRING. | |
335c5470 | 1543 | |
ddc872ba KH |
1544 | If STRING is nil, the function must compose characters in the region |
1545 | between FROM and TO in the current buffer. | |
335c5470 | 1546 | |
ddc872ba KH |
1547 | Otherwise, STRING is a string, and FROM and TO are indices into the |
1548 | string. In this case, the function must compose characters in the | |
1549 | string. */); | |
f96ba4c1 | 1550 | Vauto_composition_function = Qnil; |
40add26d | 1551 | |
58753d74 KH |
1552 | DEFVAR_LISP ("composition-function-table", &Vcomposition_function_table, |
1553 | doc: /* Char-able of functions for automatic character composition. | |
1554 | For each character that has to be composed automatically with | |
1555 | preceding and/or following characters, this char-table contains | |
1556 | a function to call to compose that character. | |
1557 | ||
1558 | The element at index C in the table, if non-nil, is a list of | |
1559 | this form: ([PATTERN PREV-CHARS FUNC] ...) | |
1560 | ||
1561 | PATTERN is a regular expression with which C and the surrounding | |
1562 | characters must match. | |
1563 | ||
1564 | PREV-CHARS is a number of characters before C to check the | |
1565 | matching with PATTERN. If it is 0, PATTERN must match with C and | |
1566 | the following characters. If it is 1, PATTERN must match with a | |
1567 | character before C and the following characters. | |
1568 | ||
1569 | If PREV-CHARS is 0, PATTERN can be nil, which means that the | |
1570 | single character C should be composed. | |
1571 | ||
1572 | FUNC is a function to return a glyph-string representing a | |
1573 | composition of the characters matching with PATTERN. It is | |
1574 | called with one argument GSTRING. | |
1575 | ||
1576 | GSTRING is a template of a glyph-string to return. It is already | |
1577 | filled with a proper header for the characters to compose, and | |
1578 | glyphs corresponding to those characters one by one. The | |
1579 | function must return a new glyph-string of the same header as | |
1580 | GSTRING, or modify GSTRING itself and return it. | |
1581 | ||
1582 | See also the documentation of `auto-composition-mode'. */); | |
1583 | Vcomposition_function_table = Fmake_char_table (Qnil, Qnil); | |
1584 | ||
ca4c9455 KH |
1585 | defsubr (&Scompose_region_internal); |
1586 | defsubr (&Scompose_string_internal); | |
1587 | defsubr (&Sfind_composition_internal); | |
58753d74 | 1588 | defsubr (&Scomposition_get_gstring); |
ca4c9455 | 1589 | } |
ee6f9c59 KH |
1590 | |
1591 | /* arch-tag: 79cefaf8-ca48-4eed-97e5-d5afb290d272 | |
1592 | (do not change this comment) */ |