Commit | Line | Data |
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ca4c9455 | 1 | /* Composite sequence support. |
73b0cd50 | 2 | Copyright (C) 2001-2011 Free Software Foundation, Inc. |
5df4f04c | 3 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
ce03bf76 KH |
4 | National Institute of Advanced Industrial Science and Technology (AIST) |
5 | Registration Number H14PRO021 | |
f30d8d94 | 6 | Copyright (C) 2003, 2006 |
1527c36e KH |
7 | National Institute of Advanced Industrial Science and Technology (AIST) |
8 | Registration Number H13PRO009 | |
ca4c9455 KH |
9 | |
10 | This file is part of GNU Emacs. | |
11 | ||
9ec0b715 | 12 | GNU Emacs is free software: you can redistribute it and/or modify |
ca4c9455 | 13 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
14 | the Free Software Foundation, either version 3 of the License, or |
15 | (at your option) any later version. | |
ca4c9455 KH |
16 | |
17 | GNU Emacs is distributed in the hope that it will be useful, | |
18 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | GNU General Public License for more details. | |
21 | ||
22 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 23 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
ca4c9455 KH |
24 | |
25 | #include <config.h> | |
d7306fe6 | 26 | #include <setjmp.h> |
ca4c9455 KH |
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 | ||
763d7377 EZ |
76 | COMPONENTS-VEC -- Vector of integers. In a relative composition, |
77 | the elements are the characters to be composed. In a rule-base | |
ca4c9455 KH |
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 | |
763d7377 EZ |
97 | of the property value. If the property is invalid, |
98 | get_composition_id returns -1 without changing the property value. | |
ca4c9455 | 99 | |
763d7377 | 100 | We use two tables to keep the information about composition; |
ca4c9455 KH |
101 | composition_hash_table and composition_table. |
102 | ||
763d7377 | 103 | The former is a hash table whose keys are COMPONENTS-VECs and |
ca4c9455 | 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 | ||
f96ba4c1 | 155 | Lisp_Object Qauto_composed; |
f96ba4c1 | 156 | Lisp_Object Qauto_composition_function; |
763d7377 EZ |
157 | /* Maximum number of characters to look back for |
158 | auto-compositions. */ | |
895416e3 KH |
159 | #define MAX_AUTO_COMPOSITION_LOOKBACK 3 |
160 | ||
ea058d2c DL |
161 | EXFUN (Fremove_list_of_text_properties, 4); |
162 | ||
ca4c9455 KH |
163 | /* Temporary variable used in macros COMPOSITION_XXX. */ |
164 | Lisp_Object composition_temp; | |
f30d8d94 | 165 | |
ca4c9455 | 166 | \f |
ca4c9455 KH |
167 | /* Return COMPOSITION-ID of a composition at buffer position |
168 | CHARPOS/BYTEPOS and length NCHARS. The `composition' property of | |
169 | the sequence is PROP. STRING, if non-nil, is a string that | |
170 | contains the composition instead of the current buffer. | |
171 | ||
172 | If the composition is invalid, return -1. */ | |
173 | ||
174 | int | |
579c18d0 EZ |
175 | get_composition_id (EMACS_INT charpos, EMACS_INT bytepos, EMACS_INT nchars, |
176 | Lisp_Object prop, Lisp_Object string) | |
ca4c9455 KH |
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; | |
579c18d0 EZ |
184 | EMACS_INT i; |
185 | int ch; | |
ca4c9455 KH |
186 | |
187 | /* PROP should be | |
188 | Form-A: ((LENGTH . COMPONENTS) . MODIFICATION-FUNC) | |
189 | or | |
190 | Form-B: (COMPOSITION-ID . (LENGTH COMPONENTS-VEC . MODIFICATION-FUNC)) | |
191 | */ | |
192 | if (nchars == 0 || !CONSP (prop)) | |
193 | goto invalid_composition; | |
194 | ||
195 | id = XCAR (prop); | |
196 | if (INTEGERP (id)) | |
197 | { | |
198 | /* PROP should be Form-B. */ | |
199 | if (XINT (id) < 0 || XINT (id) >= n_compositions) | |
200 | goto invalid_composition; | |
201 | return XINT (id); | |
202 | } | |
203 | ||
204 | /* PROP should be Form-A. | |
205 | Thus, ID should be (LENGTH . COMPONENTS). */ | |
206 | if (!CONSP (id)) | |
207 | goto invalid_composition; | |
208 | length = XCAR (id); | |
209 | if (!INTEGERP (length) || XINT (length) != nchars) | |
210 | goto invalid_composition; | |
211 | ||
212 | components = XCDR (id); | |
213 | ||
214 | /* Check if the same composition has already been registered or not | |
215 | by consulting composition_hash_table. The key for this table is | |
216 | COMPONENTS (converted to a vector COMPONENTS-VEC) or, if it is | |
217 | nil, vector of characters in the composition range. */ | |
218 | if (INTEGERP (components)) | |
219 | key = Fmake_vector (make_number (1), components); | |
220 | else if (STRINGP (components) || CONSP (components)) | |
221 | key = Fvconcat (1, &components); | |
222 | else if (VECTORP (components)) | |
223 | key = components; | |
224 | else if (NILP (components)) | |
225 | { | |
226 | key = Fmake_vector (make_number (nchars), Qnil); | |
227 | if (STRINGP (string)) | |
228 | for (i = 0; i < nchars; i++) | |
229 | { | |
230 | FETCH_STRING_CHAR_ADVANCE (ch, string, charpos, bytepos); | |
231 | XVECTOR (key)->contents[i] = make_number (ch); | |
232 | } | |
233 | else | |
234 | for (i = 0; i < nchars; i++) | |
235 | { | |
236 | FETCH_CHAR_ADVANCE (ch, charpos, bytepos); | |
237 | XVECTOR (key)->contents[i] = make_number (ch); | |
238 | } | |
239 | } | |
240 | else | |
241 | goto invalid_composition; | |
242 | ||
243 | hash_index = hash_lookup (hash_table, key, &hash_code); | |
244 | if (hash_index >= 0) | |
245 | { | |
246 | /* We have already registered the same composition. Change PROP | |
247 | from Form-A above to Form-B while replacing COMPONENTS with | |
248 | COMPONENTS-VEC stored in the hash table. We can directly | |
249 | modify the cons cell of PROP because it is not shared. */ | |
250 | key = HASH_KEY (hash_table, hash_index); | |
251 | id = HASH_VALUE (hash_table, hash_index); | |
f3fbd155 KR |
252 | XSETCAR (prop, id); |
253 | XSETCDR (prop, Fcons (make_number (nchars), Fcons (key, XCDR (prop)))); | |
ca4c9455 KH |
254 | return XINT (id); |
255 | } | |
256 | ||
257 | /* This composition is a new one. We must register it. */ | |
177c0ea7 | 258 | |
ca4c9455 KH |
259 | /* Check if we have sufficient memory to store this information. */ |
260 | if (composition_table_size == 0) | |
261 | { | |
262 | composition_table_size = 256; | |
263 | composition_table | |
264 | = (struct composition **) xmalloc (sizeof (composition_table[0]) | |
265 | * composition_table_size); | |
266 | } | |
267 | else if (composition_table_size <= n_compositions) | |
268 | { | |
269 | composition_table_size += 256; | |
270 | composition_table | |
271 | = (struct composition **) xrealloc (composition_table, | |
272 | sizeof (composition_table[0]) | |
273 | * composition_table_size); | |
274 | } | |
275 | ||
276 | key_contents = XVECTOR (key)->contents; | |
277 | ||
278 | /* Check if the contents of COMPONENTS are valid if COMPONENTS is a | |
279 | vector or a list. It should be a sequence of: | |
280 | char1 rule1 char2 rule2 char3 ... ruleN charN+1 */ | |
f30d8d94 | 281 | |
dd5e1ed4 | 282 | if (VECTORP (components) |
f30d8d94 KH |
283 | && ASIZE (components) >= 2 |
284 | && VECTORP (AREF (components, 0))) | |
285 | { | |
286 | /* COMPONENTS is a glyph-string. */ | |
579c18d0 | 287 | EMACS_UINT len = ASIZE (key); |
f30d8d94 KH |
288 | |
289 | for (i = 1; i < len; i++) | |
290 | if (! VECTORP (AREF (key, i))) | |
291 | goto invalid_composition; | |
292 | } | |
dd5e1ed4 | 293 | else if (VECTORP (components) || CONSP (components)) |
ca4c9455 | 294 | { |
579c18d0 | 295 | EMACS_UINT len = XVECTOR (key)->size; |
ca4c9455 KH |
296 | |
297 | /* The number of elements should be odd. */ | |
298 | if ((len % 2) == 0) | |
299 | goto invalid_composition; | |
300 | /* All elements should be integers (character or encoded | |
301 | composition rule). */ | |
302 | for (i = 0; i < len; i++) | |
303 | { | |
304 | if (!INTEGERP (key_contents[i])) | |
305 | goto invalid_composition; | |
306 | } | |
307 | } | |
308 | ||
309 | /* Change PROP from Form-A above to Form-B. We can directly modify | |
310 | the cons cell of PROP because it is not shared. */ | |
311 | XSETFASTINT (id, n_compositions); | |
f3fbd155 KR |
312 | XSETCAR (prop, id); |
313 | XSETCDR (prop, Fcons (make_number (nchars), Fcons (key, XCDR (prop)))); | |
ca4c9455 KH |
314 | |
315 | /* Register the composition in composition_hash_table. */ | |
316 | hash_index = hash_put (hash_table, key, id, hash_code); | |
317 | ||
318 | /* Register the composition in composition_table. */ | |
319 | cmp = (struct composition *) xmalloc (sizeof (struct composition)); | |
320 | ||
321 | cmp->method = (NILP (components) | |
322 | ? COMPOSITION_RELATIVE | |
323 | : ((INTEGERP (components) || STRINGP (components)) | |
324 | ? COMPOSITION_WITH_ALTCHARS | |
325 | : COMPOSITION_WITH_RULE_ALTCHARS)); | |
326 | cmp->hash_index = hash_index; | |
327 | glyph_len = (cmp->method == COMPOSITION_WITH_RULE_ALTCHARS | |
328 | ? (XVECTOR (key)->size + 1) / 2 | |
329 | : XVECTOR (key)->size); | |
330 | cmp->glyph_len = glyph_len; | |
331 | cmp->offsets = (short *) xmalloc (sizeof (short) * glyph_len * 2); | |
332 | cmp->font = NULL; | |
333 | ||
58753d74 | 334 | if (cmp->method != COMPOSITION_WITH_RULE_ALTCHARS) |
ca4c9455 KH |
335 | { |
336 | /* Relative composition. */ | |
337 | cmp->width = 0; | |
338 | for (i = 0; i < glyph_len; i++) | |
339 | { | |
340 | int this_width; | |
341 | ch = XINT (key_contents[i]); | |
8e86803c | 342 | this_width = (ch == '\t' ? 1 : CHAR_WIDTH (ch)); |
ca4c9455 KH |
343 | if (cmp->width < this_width) |
344 | cmp->width = this_width; | |
345 | } | |
346 | } | |
347 | else | |
348 | { | |
349 | /* Rule-base composition. */ | |
350 | float leftmost = 0.0, rightmost; | |
351 | ||
352 | ch = XINT (key_contents[0]); | |
69df789a | 353 | rightmost = ch != '\t' ? CHAR_WIDTH (ch) : 1; |
ca4c9455 KH |
354 | |
355 | for (i = 1; i < glyph_len; i += 2) | |
356 | { | |
464f8566 | 357 | int rule, gref, nref, xoff, yoff; |
ca4c9455 KH |
358 | int this_width; |
359 | float this_left; | |
360 | ||
361 | rule = XINT (key_contents[i]); | |
362 | ch = XINT (key_contents[i + 1]); | |
69df789a | 363 | this_width = ch != '\t' ? CHAR_WIDTH (ch) : 1; |
ca4c9455 KH |
364 | |
365 | /* A composition rule is specified by an integer value | |
366 | that encodes global and new reference points (GREF and | |
367 | NREF). GREF and NREF are specified by numbers as | |
368 | below: | |
369 | 0---1---2 -- ascent | |
370 | | | | |
371 | | | | |
372 | | | | |
373 | 9--10--11 -- center | |
374 | | | | |
375 | ---3---4---5--- baseline | |
376 | | | | |
377 | 6---7---8 -- descent | |
378 | */ | |
464f8566 | 379 | COMPOSITION_DECODE_RULE (rule, gref, nref, xoff, yoff); |
ca4c9455 KH |
380 | this_left = (leftmost |
381 | + (gref % 3) * (rightmost - leftmost) / 2.0 | |
382 | - (nref % 3) * this_width / 2.0); | |
383 | ||
384 | if (this_left < leftmost) | |
385 | leftmost = this_left; | |
386 | if (this_left + this_width > rightmost) | |
387 | rightmost = this_left + this_width; | |
388 | } | |
389 | ||
390 | cmp->width = rightmost - leftmost; | |
391 | if (cmp->width < (rightmost - leftmost)) | |
392 | /* To get a ceiling integer value. */ | |
393 | cmp->width++; | |
394 | } | |
395 | ||
396 | composition_table[n_compositions] = cmp; | |
397 | ||
398 | return n_compositions++; | |
399 | ||
400 | invalid_composition: | |
401 | /* Would it be better to remove this `composition' property? */ | |
402 | return -1; | |
403 | } | |
404 | ||
405 | \f | |
90b3fe91 KH |
406 | /* Find a static composition at or nearest to position POS of OBJECT |
407 | (buffer or string). | |
ca4c9455 KH |
408 | |
409 | OBJECT defaults to the current buffer. If there's a composition at | |
410 | POS, set *START and *END to the start and end of the sequence, | |
411 | *PROP to the `composition' property, and return 1. | |
412 | ||
413 | If there's no composition at POS and LIMIT is negative, return 0. | |
414 | ||
415 | Otherwise, search for a composition forward (LIMIT > POS) or | |
416 | backward (LIMIT < POS). In this case, LIMIT bounds the search. | |
417 | ||
418 | If a composition is found, set *START, *END, and *PROP as above, | |
419 | and return 1, else return 0. | |
420 | ||
421 | This doesn't check the validity of composition. */ | |
422 | ||
423 | int | |
579c18d0 EZ |
424 | find_composition (EMACS_INT pos, EMACS_INT limit, |
425 | EMACS_INT *start, EMACS_INT *end, | |
426 | Lisp_Object *prop, Lisp_Object object) | |
ca4c9455 KH |
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 | |
579c18d0 | 464 | run_composition_function (EMACS_INT from, EMACS_INT to, Lisp_Object prop) |
ca4c9455 | 465 | { |
7d019510 | 466 | Lisp_Object func; |
aaefca97 | 467 | EMACS_INT start, end; |
ca4c9455 KH |
468 | |
469 | func = COMPOSITION_MODIFICATION_FUNC (prop); | |
470 | /* If an invalid composition precedes or follows, try to make them | |
471 | valid too. */ | |
472 | if (from > BEGV | |
473 | && find_composition (from - 1, -1, &start, &end, &prop, Qnil) | |
474 | && !COMPOSITION_VALID_P (start, end, prop)) | |
475 | from = start; | |
476 | if (to < ZV | |
477 | && find_composition (to, -1, &start, &end, &prop, Qnil) | |
478 | && !COMPOSITION_VALID_P (start, end, prop)) | |
479 | to = end; | |
775b3d2d | 480 | if (!NILP (Ffboundp (func))) |
ca4c9455 | 481 | call2 (func, make_number (from), make_number (to)); |
ca4c9455 KH |
482 | } |
483 | ||
484 | /* Make invalid compositions adjacent to or inside FROM and TO valid. | |
485 | CHECK_MASK is bitwise `or' of mask bits defined by macros | |
486 | CHECK_XXX (see the comment in composite.h). | |
487 | ||
b418f8a6 | 488 | It also resets the text-property `auto-composed' to a proper region |
f96ba4c1 KH |
489 | so that automatic character composition works correctly later while |
490 | displaying the region. | |
8f924df7 | 491 | |
ca4c9455 KH |
492 | This function is called when a buffer text is changed. If the |
493 | change is deletion, FROM == TO. Otherwise, FROM < TO. */ | |
494 | ||
495 | void | |
971de7fb | 496 | update_compositions (EMACS_INT from, EMACS_INT to, int check_mask) |
ca4c9455 | 497 | { |
7d019510 | 498 | Lisp_Object prop; |
aaefca97 | 499 | EMACS_INT start, end; |
f96ba4c1 KH |
500 | /* The beginning and end of the region to set the property |
501 | `auto-composed' to nil. */ | |
aaefca97 | 502 | EMACS_INT min_pos = from, max_pos = to; |
ca4c9455 | 503 | |
6c1aa7f1 GM |
504 | if (inhibit_modification_hooks) |
505 | return; | |
177c0ea7 | 506 | |
d3f40cbd KH |
507 | /* If FROM and TO are not in a valid range, do nothing. */ |
508 | if (! (BEGV <= from && from <= to && to <= ZV)) | |
509 | return; | |
510 | ||
ca4c9455 KH |
511 | if (check_mask & CHECK_HEAD) |
512 | { | |
513 | /* FROM should be at composition boundary. But, insertion or | |
514 | deletion will make two compositions adjacent and | |
515 | indistinguishable when they have same (eq) property. To | |
516 | avoid it, in such a case, we change the property of the | |
517 | latter to the copy of it. */ | |
518 | if (from > BEGV | |
553d3164 KH |
519 | && find_composition (from - 1, -1, &start, &end, &prop, Qnil) |
520 | && COMPOSITION_VALID_P (start, end, prop)) | |
ca4c9455 | 521 | { |
f96ba4c1 KH |
522 | min_pos = start; |
523 | if (end > to) | |
524 | max_pos = end; | |
ca4c9455 KH |
525 | if (from < end) |
526 | Fput_text_property (make_number (from), make_number (end), | |
527 | Qcomposition, | |
528 | Fcons (XCAR (prop), XCDR (prop)), Qnil); | |
529 | run_composition_function (start, end, prop); | |
530 | from = end; | |
531 | } | |
dd33cc56 | 532 | else if (from < ZV |
553d3164 | 533 | && find_composition (from, -1, &start, &from, &prop, Qnil) |
9657d668 | 534 | && COMPOSITION_VALID_P (start, from, prop)) |
f96ba4c1 KH |
535 | { |
536 | if (from > to) | |
537 | max_pos = from; | |
538 | run_composition_function (start, from, prop); | |
539 | } | |
ca4c9455 KH |
540 | } |
541 | ||
542 | if (check_mask & CHECK_INSIDE) | |
543 | { | |
544 | /* In this case, we are sure that (check & CHECK_TAIL) is also | |
545 | nonzero. Thus, here we should check only compositions before | |
546 | (to - 1). */ | |
547 | while (from < to - 1 | |
548 | && find_composition (from, to, &start, &from, &prop, Qnil) | |
9657d668 | 549 | && COMPOSITION_VALID_P (start, from, prop) |
ca4c9455 KH |
550 | && from < to - 1) |
551 | run_composition_function (start, from, prop); | |
552 | } | |
553 | ||
554 | if (check_mask & CHECK_TAIL) | |
555 | { | |
556 | if (from < to | |
553d3164 KH |
557 | && find_composition (to - 1, -1, &start, &end, &prop, Qnil) |
558 | && COMPOSITION_VALID_P (start, end, prop)) | |
ca4c9455 KH |
559 | { |
560 | /* TO should be also at composition boundary. But, | |
561 | insertion or deletion will make two compositions adjacent | |
562 | and indistinguishable when they have same (eq) property. | |
563 | To avoid it, in such a case, we change the property of | |
564 | the former to the copy of it. */ | |
565 | if (to < end) | |
f96ba4c1 KH |
566 | { |
567 | Fput_text_property (make_number (start), make_number (to), | |
568 | Qcomposition, | |
569 | Fcons (XCAR (prop), XCDR (prop)), Qnil); | |
570 | max_pos = end; | |
571 | } | |
ca4c9455 KH |
572 | run_composition_function (start, end, prop); |
573 | } | |
574 | else if (to < ZV | |
553d3164 KH |
575 | && find_composition (to, -1, &start, &end, &prop, Qnil) |
576 | && COMPOSITION_VALID_P (start, end, prop)) | |
f96ba4c1 KH |
577 | { |
578 | run_composition_function (start, end, prop); | |
579 | max_pos = end; | |
580 | } | |
ca4c9455 | 581 | } |
f96ba4c1 | 582 | if (min_pos < max_pos) |
9d440521 KH |
583 | { |
584 | int count = SPECPDL_INDEX (); | |
585 | ||
586 | specbind (Qinhibit_read_only, Qt); | |
587 | specbind (Qinhibit_modification_hooks, Qt); | |
588 | specbind (Qinhibit_point_motion_hooks, Qt); | |
589 | Fremove_list_of_text_properties (make_number (min_pos), | |
590 | make_number (max_pos), | |
591 | Fcons (Qauto_composed, Qnil), Qnil); | |
592 | unbind_to (count, Qnil); | |
593 | } | |
ca4c9455 KH |
594 | } |
595 | ||
c1361885 KH |
596 | |
597 | /* Modify composition property values in LIST destructively. LIST is | |
598 | a list as returned from text_property_list. Change values to the | |
599 | top-level copies of them so that none of them are `eq'. */ | |
600 | ||
601 | void | |
971de7fb | 602 | make_composition_value_copy (Lisp_Object list) |
c1361885 KH |
603 | { |
604 | Lisp_Object plist, val; | |
605 | ||
606 | for (; CONSP (list); list = XCDR (list)) | |
607 | { | |
608 | plist = XCAR (XCDR (XCDR (XCAR (list)))); | |
609 | while (CONSP (plist) && CONSP (XCDR (plist))) | |
610 | { | |
611 | if (EQ (XCAR (plist), Qcomposition) | |
612 | && (val = XCAR (XCDR (plist)), CONSP (val))) | |
f3fbd155 | 613 | XSETCAR (XCDR (plist), Fcons (XCAR (val), XCDR (val))); |
c1361885 KH |
614 | plist = XCDR (XCDR (plist)); |
615 | } | |
616 | } | |
617 | } | |
618 | ||
619 | ||
ca4c9455 KH |
620 | /* Make text in the region between START and END a composition that |
621 | has COMPONENTS and MODIFICATION-FUNC. | |
622 | ||
623 | If STRING is non-nil, then operate on characters contained between | |
624 | indices START and END in STRING. */ | |
625 | ||
626 | void | |
579c18d0 EZ |
627 | compose_text (EMACS_INT start, EMACS_INT end, Lisp_Object components, |
628 | Lisp_Object modification_func, Lisp_Object string) | |
ca4c9455 KH |
629 | { |
630 | Lisp_Object prop; | |
631 | ||
632 | prop = Fcons (Fcons (make_number (end - start), components), | |
633 | modification_func); | |
634 | Fput_text_property (make_number (start), make_number (end), | |
635 | Qcomposition, prop, string); | |
636 | } | |
58753d74 KH |
637 | |
638 | ||
f57e2426 J |
639 | static Lisp_Object autocmp_chars (Lisp_Object, EMACS_INT, EMACS_INT, |
640 | EMACS_INT, struct window *, | |
641 | struct face *, Lisp_Object); | |
58753d74 KH |
642 | |
643 | \f | |
644 | /* Lisp glyph-string handlers */ | |
645 | ||
646 | /* Hash table for automatic composition. The key is a header of a | |
647 | lgstring (Lispy glyph-string), and the value is a body of a | |
648 | lgstring. */ | |
649 | ||
650 | static Lisp_Object gstring_hash_table; | |
651 | ||
f57e2426 | 652 | static Lisp_Object gstring_lookup_cache (Lisp_Object); |
58753d74 KH |
653 | |
654 | static Lisp_Object | |
971de7fb | 655 | gstring_lookup_cache (Lisp_Object header) |
58753d74 KH |
656 | { |
657 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
658 | int i = hash_lookup (h, header, NULL); | |
659 | ||
660 | return (i >= 0 ? HASH_VALUE (h, i) : Qnil); | |
661 | } | |
662 | ||
663 | Lisp_Object | |
971de7fb | 664 | composition_gstring_put_cache (Lisp_Object gstring, int len) |
58753d74 KH |
665 | { |
666 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
667 | unsigned hash; | |
668 | Lisp_Object header, copy; | |
669 | int i; | |
670 | ||
671 | header = LGSTRING_HEADER (gstring); | |
672 | hash = h->hashfn (h, header); | |
673 | if (len < 0) | |
674 | { | |
675 | len = LGSTRING_GLYPH_LEN (gstring); | |
676 | for (i = 0; i < len; i++) | |
677 | if (NILP (LGSTRING_GLYPH (gstring, i))) | |
678 | break; | |
679 | len = i; | |
680 | } | |
087e2ea9 | 681 | |
58753d74 KH |
682 | copy = Fmake_vector (make_number (len + 2), Qnil); |
683 | LGSTRING_SET_HEADER (copy, Fcopy_sequence (header)); | |
684 | for (i = 0; i < len; i++) | |
685 | LGSTRING_SET_GLYPH (copy, i, Fcopy_sequence (LGSTRING_GLYPH (gstring, i))); | |
686 | i = hash_put (h, LGSTRING_HEADER (copy), copy, hash); | |
687 | LGSTRING_SET_ID (copy, make_number (i)); | |
688 | return copy; | |
689 | } | |
690 | ||
691 | Lisp_Object | |
971de7fb | 692 | composition_gstring_from_id (int id) |
58753d74 KH |
693 | { |
694 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
695 | ||
696 | return HASH_VALUE (h, id); | |
697 | } | |
698 | ||
f57e2426 J |
699 | static Lisp_Object fill_gstring_header (Lisp_Object, Lisp_Object, |
700 | Lisp_Object, Lisp_Object, | |
701 | Lisp_Object); | |
58753d74 KH |
702 | |
703 | int | |
971de7fb | 704 | composition_gstring_p (Lisp_Object gstring) |
58753d74 KH |
705 | { |
706 | Lisp_Object header; | |
707 | int i; | |
708 | ||
709 | if (! VECTORP (gstring) || ASIZE (gstring) < 2) | |
710 | return 0; | |
711 | header = LGSTRING_HEADER (gstring); | |
712 | if (! VECTORP (header) || ASIZE (header) < 2) | |
713 | return 0; | |
714 | if (! NILP (LGSTRING_FONT (gstring)) | |
f5199465 KH |
715 | && (! FONT_OBJECT_P (LGSTRING_FONT (gstring)) |
716 | && ! CODING_SYSTEM_P (LGSTRING_FONT (gstring)))) | |
58753d74 KH |
717 | return 0; |
718 | for (i = 1; i < ASIZE (LGSTRING_HEADER (gstring)); i++) | |
719 | if (! NATNUMP (AREF (LGSTRING_HEADER (gstring), i))) | |
720 | return 0; | |
721 | if (! NILP (LGSTRING_ID (gstring)) && ! NATNUMP (LGSTRING_ID (gstring))) | |
722 | return 0; | |
723 | for (i = 0; i < LGSTRING_GLYPH_LEN (gstring); i++) | |
724 | { | |
725 | Lisp_Object glyph = LGSTRING_GLYPH (gstring, i); | |
726 | if (NILP (glyph)) | |
727 | break; | |
728 | if (! VECTORP (glyph) || ASIZE (glyph) != LGLYPH_SIZE) | |
729 | return 0; | |
730 | } | |
731 | return 1; | |
732 | } | |
733 | ||
734 | int | |
579c18d0 EZ |
735 | composition_gstring_width (Lisp_Object gstring, EMACS_INT from, EMACS_INT to, |
736 | struct font_metrics *metrics) | |
58753d74 KH |
737 | { |
738 | Lisp_Object *glyph; | |
739 | int width = 0; | |
740 | ||
741 | if (metrics) | |
742 | { | |
743 | Lisp_Object font_object = LGSTRING_FONT (gstring); | |
58753d74 | 744 | |
f5199465 KH |
745 | if (FONT_OBJECT_P (font_object)) |
746 | { | |
747 | struct font *font = XFONT_OBJECT (font_object); | |
748 | ||
749 | metrics->ascent = font->ascent; | |
750 | metrics->descent = font->descent; | |
751 | } | |
752 | else | |
753 | { | |
754 | metrics->ascent = 1; | |
755 | metrics->descent = 0; | |
756 | } | |
58753d74 KH |
757 | metrics->width = metrics->lbearing = metrics->rbearing = 0; |
758 | } | |
759 | for (glyph = &LGSTRING_GLYPH (gstring, from); from < to; from++, glyph++) | |
760 | { | |
761 | int x; | |
762 | ||
763 | if (NILP (LGLYPH_ADJUSTMENT (*glyph))) | |
764 | width += LGLYPH_WIDTH (*glyph); | |
765 | else | |
766 | width += LGLYPH_WADJUST (*glyph); | |
767 | if (metrics) | |
768 | { | |
769 | x = metrics->width + LGLYPH_LBEARING (*glyph) + LGLYPH_XOFF (*glyph); | |
770 | if (metrics->lbearing > x) | |
771 | metrics->lbearing = x; | |
772 | x = metrics->width + LGLYPH_RBEARING (*glyph) + LGLYPH_XOFF (*glyph); | |
773 | if (metrics->rbearing < x) | |
774 | metrics->rbearing = x; | |
775 | metrics->width = width; | |
776 | x = LGLYPH_ASCENT (*glyph) - LGLYPH_YOFF (*glyph); | |
777 | if (metrics->ascent < x) | |
778 | metrics->ascent = x; | |
895416e3 | 779 | x = LGLYPH_DESCENT (*glyph) + LGLYPH_YOFF (*glyph); |
58753d74 KH |
780 | if (metrics->descent < x) |
781 | metrics->descent = x; | |
782 | } | |
783 | } | |
784 | return width; | |
785 | } | |
786 | ||
787 | ||
788 | static Lisp_Object gstring_work; | |
789 | static Lisp_Object gstring_work_headers; | |
790 | ||
791 | static Lisp_Object | |
971de7fb | 792 | fill_gstring_header (Lisp_Object header, Lisp_Object start, Lisp_Object end, Lisp_Object font_object, Lisp_Object string) |
58753d74 KH |
793 | { |
794 | EMACS_INT from, to, from_byte; | |
795 | EMACS_INT len, i; | |
796 | ||
797 | if (NILP (string)) | |
798 | { | |
4b4deea2 | 799 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
58753d74 KH |
800 | error ("Attempt to shape unibyte text"); |
801 | validate_region (&start, &end); | |
802 | from = XFASTINT (start); | |
803 | to = XFASTINT (end); | |
804 | from_byte = CHAR_TO_BYTE (from); | |
805 | } | |
806 | else | |
807 | { | |
808 | CHECK_STRING (string); | |
793ffee8 | 809 | if (! STRING_MULTIBYTE (string)) |
58753d74 | 810 | error ("Attempt to shape unibyte text"); |
ea8ba975 | 811 | /* FROM and TO are checked by the caller. */ |
58753d74 | 812 | from = XINT (start); |
58753d74 KH |
813 | to = XINT (end); |
814 | if (from < 0 || from > to || to > SCHARS (string)) | |
815 | args_out_of_range_3 (string, start, end); | |
816 | from_byte = string_char_to_byte (string, from); | |
817 | } | |
818 | ||
819 | len = to - from; | |
820 | if (len == 0) | |
821 | error ("Attempt to shape zero-length text"); | |
822 | if (VECTORP (header)) | |
823 | { | |
824 | if (ASIZE (header) != len + 1) | |
825 | args_out_of_range (header, make_number (len + 1)); | |
826 | } | |
827 | else | |
828 | { | |
829 | if (len <= 8) | |
830 | header = AREF (gstring_work_headers, len - 1); | |
831 | else | |
832 | header = Fmake_vector (make_number (len + 1), Qnil); | |
833 | } | |
834 | ||
835 | ASET (header, 0, font_object); | |
836 | for (i = 0; i < len; i++) | |
837 | { | |
838 | int c; | |
839 | ||
840 | if (NILP (string)) | |
841 | FETCH_CHAR_ADVANCE_NO_CHECK (c, from, from_byte); | |
842 | else | |
843 | FETCH_STRING_CHAR_ADVANCE_NO_CHECK (c, string, from, from_byte); | |
844 | ASET (header, i + 1, make_number (c)); | |
845 | } | |
846 | return header; | |
847 | } | |
848 | ||
58753d74 | 849 | static void |
971de7fb | 850 | fill_gstring_body (Lisp_Object gstring) |
58753d74 KH |
851 | { |
852 | Lisp_Object font_object = LGSTRING_FONT (gstring); | |
853 | Lisp_Object header = AREF (gstring, 0); | |
854 | EMACS_INT len = LGSTRING_CHAR_LEN (gstring); | |
855 | EMACS_INT i; | |
856 | ||
857 | for (i = 0; i < len; i++) | |
858 | { | |
859 | Lisp_Object g = LGSTRING_GLYPH (gstring, i); | |
77fa4db2 | 860 | EMACS_INT c = XINT (AREF (header, i + 1)); |
58753d74 KH |
861 | |
862 | if (NILP (g)) | |
863 | { | |
864 | g = LGLYPH_NEW (); | |
865 | LGSTRING_SET_GLYPH (gstring, i, g); | |
866 | } | |
867 | LGLYPH_SET_FROM (g, i); | |
868 | LGLYPH_SET_TO (g, i); | |
869 | LGLYPH_SET_CHAR (g, c); | |
f5199465 | 870 | if (FONT_OBJECT_P (font_object)) |
58753d74 KH |
871 | { |
872 | font_fill_lglyph_metrics (g, font_object); | |
873 | } | |
874 | else | |
875 | { | |
876 | int width = XFASTINT (CHAR_TABLE_REF (Vchar_width_table, c)); | |
877 | ||
878 | LGLYPH_SET_CODE (g, c); | |
879 | LGLYPH_SET_LBEARING (g, 0); | |
880 | LGLYPH_SET_RBEARING (g, width); | |
881 | LGLYPH_SET_WIDTH (g, width); | |
882 | LGLYPH_SET_ASCENT (g, 1); | |
883 | LGLYPH_SET_DESCENT (g, 0); | |
884 | } | |
885 | LGLYPH_SET_ADJUSTMENT (g, Qnil); | |
886 | } | |
887 | if (i < LGSTRING_GLYPH_LEN (gstring)) | |
888 | LGSTRING_SET_GLYPH (gstring, i, Qnil); | |
889 | } | |
890 | ||
58753d74 | 891 | |
10f72a37 KH |
892 | /* Try to compose the characters at CHARPOS according to composition |
893 | rule RULE ([PATTERN PREV-CHARS FUNC]). LIMIT limits the characters | |
894 | to compose. STRING, if not nil, is a target string. WIN is a | |
895 | window where the characters are being displayed. If characters are | |
896 | successfully composed, return the composition as a glyph-string | |
897 | object. Otherwise return nil. */ | |
58753d74 KH |
898 | |
899 | static Lisp_Object | |
971de7fb | 900 | autocmp_chars (Lisp_Object rule, EMACS_INT charpos, EMACS_INT bytepos, EMACS_INT limit, struct window *win, struct face *face, Lisp_Object string) |
58753d74 KH |
901 | { |
902 | int count = SPECPDL_INDEX (); | |
903 | FRAME_PTR f = XFRAME (win->frame); | |
904 | Lisp_Object pos = make_number (charpos); | |
10f72a37 | 905 | EMACS_INT to; |
58753d74 | 906 | EMACS_INT pt = PT, pt_byte = PT_BYTE; |
10f72a37 | 907 | Lisp_Object re, font_object, lgstring; |
579c18d0 | 908 | EMACS_INT len; |
087e2ea9 | 909 | |
58753d74 | 910 | record_unwind_save_match_data (); |
10f72a37 KH |
911 | re = AREF (rule, 0); |
912 | if (NILP (re)) | |
913 | len = 1; | |
914 | else if (! STRINGP (re)) | |
915 | return unbind_to (count, Qnil); | |
916 | else if ((len = fast_looking_at (re, charpos, bytepos, limit, -1, string)) | |
917 | > 0) | |
58753d74 | 918 | { |
10f72a37 KH |
919 | if (NILP (string)) |
920 | len = BYTE_TO_CHAR (bytepos + len) - charpos; | |
921 | else | |
922 | len = string_byte_to_char (string, bytepos + len) - charpos; | |
923 | } | |
924 | if (len <= 0) | |
925 | return unbind_to (count, Qnil); | |
926 | to = limit = charpos + len; | |
58753d74 | 927 | #ifdef HAVE_WINDOW_SYSTEM |
10f72a37 KH |
928 | if (FRAME_WINDOW_P (f)) |
929 | { | |
930 | font_object = font_range (charpos, &to, win, face, string); | |
931 | if (! FONT_OBJECT_P (font_object) | |
932 | || (! NILP (re) | |
933 | && to < limit | |
934 | && (fast_looking_at (re, charpos, bytepos, to, -1, string) <= 0))) | |
935 | return unbind_to (count, Qnil); | |
936 | } | |
937 | else | |
58753d74 | 938 | #endif /* not HAVE_WINDOW_SYSTEM */ |
10f72a37 KH |
939 | font_object = win->frame; |
940 | lgstring = Fcomposition_get_gstring (pos, make_number (to), font_object, | |
941 | string); | |
942 | if (NILP (LGSTRING_ID (lgstring))) | |
943 | { | |
944 | Lisp_Object args[6]; | |
5dcde606 | 945 | |
10f72a37 KH |
946 | /* Save point as marker before calling out to lisp. */ |
947 | if (NILP (string)) | |
948 | { | |
949 | Lisp_Object m = Fmake_marker (); | |
950 | set_marker_both (m, Qnil, pt, pt_byte); | |
951 | record_unwind_protect (restore_point_unwind, m); | |
58753d74 | 952 | } |
10f72a37 KH |
953 | |
954 | args[0] = Vauto_composition_function; | |
955 | args[1] = AREF (rule, 2); | |
956 | args[2] = pos; | |
957 | args[3] = make_number (to); | |
958 | args[4] = font_object; | |
959 | args[5] = string; | |
960 | lgstring = safe_call (6, args); | |
961 | if (NILP (string)) | |
962 | TEMP_SET_PT_BOTH (pt, pt_byte); | |
58753d74 | 963 | } |
10f72a37 | 964 | return unbind_to (count, lgstring); |
58753d74 KH |
965 | } |
966 | ||
82ebc97b KH |
967 | static Lisp_Object _work_val; |
968 | static int _work_char; | |
969 | ||
f6aa6ec6 KH |
970 | /* 1 iff the character C is composable. Characters of general |
971 | category Z? or C? are not composable except for ZWNJ and ZWJ. */ | |
972 | ||
82ebc97b KH |
973 | #define CHAR_COMPOSABLE_P(C) \ |
974 | ((C) == 0x200C || (C) == 0x200D \ | |
975 | || (_work_val = CHAR_TABLE_REF (Vunicode_category_table, (C)), \ | |
976 | (SYMBOLP (_work_val) \ | |
977 | && (_work_char = SDATA (SYMBOL_NAME (_work_val))[0]) != 'C' \ | |
978 | && _work_char != 'Z'))) | |
58753d74 KH |
979 | |
980 | /* Update cmp_it->stop_pos to the next position after CHARPOS (and | |
981 | BYTEPOS) where character composition may happen. If BYTEPOS is | |
82ebc97b KH |
982 | negative, compute it. ENDPOS is a limit of searching. If it is |
983 | less than CHARPOS, search backward to ENDPOS+1 assuming that | |
984 | set_iterator_to_next works in reverse order. In this case, if a | |
985 | composition closest to CHARPOS is found, set cmp_it->stop_pos to | |
986 | the last character of the composition. | |
987 | ||
988 | If no composition is found, set cmp_it->ch to -2. If a static | |
989 | composition is found, set cmp_it->ch to -1. Otherwise, set | |
990 | cmp_it->ch to the character that triggers the automatic | |
991 | composition. */ | |
58753d74 KH |
992 | |
993 | void | |
971de7fb | 994 | composition_compute_stop_pos (struct composition_it *cmp_it, EMACS_INT charpos, EMACS_INT bytepos, EMACS_INT endpos, Lisp_Object string) |
58753d74 KH |
995 | { |
996 | EMACS_INT start, end, c; | |
997 | Lisp_Object prop, val; | |
3ffdafce KH |
998 | /* This is from forward_to_next_line_start in xdisp.c. */ |
999 | const int MAX_NEWLINE_DISTANCE = 500; | |
58753d74 | 1000 | |
82ebc97b KH |
1001 | if (charpos < endpos) |
1002 | { | |
1003 | if (endpos > charpos + MAX_NEWLINE_DISTANCE) | |
1004 | endpos = charpos + MAX_NEWLINE_DISTANCE; | |
1005 | } | |
1006 | else if (endpos < charpos) | |
1007 | { | |
1008 | /* We search backward for a position to check composition. */ | |
1009 | if (endpos < 0) | |
1010 | { | |
1011 | /* But we don't know where to stop the searching. */ | |
1012 | endpos = NILP (string) ? BEGV - 1 : -1; | |
1013 | /* Usually we don't reach ENDPOS because we stop searching | |
1014 | at an uncomposable character (NL, LRE, etc). */ | |
1015 | } | |
1016 | } | |
053ca52b | 1017 | cmp_it->id = -1; |
44566dc7 | 1018 | cmp_it->ch = -2; |
82ebc97b KH |
1019 | cmp_it->reversed_p = 0; |
1020 | cmp_it->stop_pos = endpos; | |
1021 | if (charpos == endpos) | |
1022 | return; | |
1023 | /* FIXME: Bidi is not yet handled well in static composition. */ | |
1024 | if (charpos < endpos | |
1025 | && find_composition (charpos, endpos, &start, &end, &prop, string) | |
58753d74 KH |
1026 | && COMPOSITION_VALID_P (start, end, prop)) |
1027 | { | |
1028 | cmp_it->stop_pos = endpos = start; | |
1029 | cmp_it->ch = -1; | |
1030 | } | |
4b4deea2 | 1031 | if (NILP (BVAR (current_buffer, enable_multibyte_characters)) |
d9a7c140 | 1032 | || NILP (Vauto_composition_mode)) |
58753d74 KH |
1033 | return; |
1034 | if (bytepos < 0) | |
1035 | { | |
82ebc97b | 1036 | if (NILP (string)) |
58753d74 | 1037 | bytepos = CHAR_TO_BYTE (charpos); |
82ebc97b KH |
1038 | else |
1039 | bytepos = string_char_to_byte (string, charpos); | |
58753d74 KH |
1040 | } |
1041 | ||
1042 | start = charpos; | |
82ebc97b | 1043 | if (charpos < endpos) |
58753d74 | 1044 | { |
82ebc97b KH |
1045 | /* Forward search. */ |
1046 | while (charpos < endpos) | |
ea8ba975 | 1047 | { |
82ebc97b KH |
1048 | if (STRINGP (string)) |
1049 | FETCH_STRING_CHAR_ADVANCE (c, string, charpos, bytepos); | |
1050 | else | |
1051 | FETCH_CHAR_ADVANCE (c, charpos, bytepos); | |
1052 | if (c == '\n') | |
1053 | { | |
1054 | cmp_it->ch = -2; | |
1055 | break; | |
1056 | } | |
1057 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1058 | if (! NILP (val)) | |
1059 | { | |
1060 | Lisp_Object elt; | |
10f72a37 | 1061 | int ridx; |
82ebc97b | 1062 | |
10f72a37 | 1063 | for (ridx = 0; CONSP (val); val = XCDR (val), ridx++) |
82ebc97b KH |
1064 | { |
1065 | elt = XCAR (val); | |
1066 | if (VECTORP (elt) && ASIZE (elt) == 3 | |
1067 | && NATNUMP (AREF (elt, 1)) | |
1068 | && charpos - 1 - XFASTINT (AREF (elt, 1)) >= start) | |
1069 | break; | |
1070 | } | |
1071 | if (CONSP (val)) | |
1072 | { | |
10f72a37 | 1073 | cmp_it->rule_idx = ridx; |
82ebc97b KH |
1074 | cmp_it->lookback = XFASTINT (AREF (elt, 1)); |
1075 | cmp_it->stop_pos = charpos - 1 - cmp_it->lookback; | |
1076 | cmp_it->ch = c; | |
1077 | return; | |
1078 | } | |
1079 | } | |
ea8ba975 | 1080 | } |
ff94e32c KH |
1081 | if (charpos == endpos) |
1082 | { | |
1083 | /* We couldn't find a composition point before ENDPOS. But, | |
1084 | some character after ENDPOS may be composed with | |
1085 | characters before ENDPOS. So, we should stop at the safe | |
1086 | point. */ | |
1087 | charpos = endpos - MAX_AUTO_COMPOSITION_LOOKBACK; | |
1088 | if (charpos < start) | |
1089 | charpos = start; | |
1090 | } | |
82ebc97b | 1091 | } |
b7050583 | 1092 | else if (charpos > endpos) |
82ebc97b KH |
1093 | { |
1094 | /* Search backward for a pattern that may be composed and the | |
1095 | position of (possibly) the last character of the match is | |
1096 | closest to (but not after) START. The reason for the last | |
d07f018c EZ |
1097 | character is that set_iterator_to_next works in reverse order, |
1098 | and thus we must stop at the last character for composition | |
82ebc97b KH |
1099 | check. */ |
1100 | unsigned char *p; | |
1101 | int len; | |
d07f018c EZ |
1102 | /* Limit byte position used in fast_looking_at. This is the |
1103 | byte position of the character after START. */ | |
82ebc97b KH |
1104 | EMACS_INT limit; |
1105 | ||
1106 | if (NILP (string)) | |
1107 | p = BYTE_POS_ADDR (bytepos); | |
1108 | else | |
1109 | p = SDATA (string) + bytepos; | |
1110 | c = STRING_CHAR_AND_LENGTH (p, len); | |
1111 | limit = bytepos + len; | |
1112 | while (CHAR_COMPOSABLE_P (c)) | |
58753d74 | 1113 | { |
10f72a37 KH |
1114 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); |
1115 | if (! NILP (val)) | |
82ebc97b | 1116 | { |
10f72a37 | 1117 | Lisp_Object elt; |
8f5201ae | 1118 | int ridx, back, blen; |
58753d74 | 1119 | |
10f72a37 | 1120 | for (ridx = 0; CONSP (val); val = XCDR (val), ridx++) |
82ebc97b | 1121 | { |
10f72a37 KH |
1122 | elt = XCAR (val); |
1123 | if (VECTORP (elt) && ASIZE (elt) == 3 | |
1124 | && NATNUMP (AREF (elt, 1)) | |
1125 | && charpos - (back = XFASTINT (AREF (elt, 1))) > endpos) | |
82ebc97b | 1126 | { |
10f72a37 KH |
1127 | EMACS_INT cpos = charpos - back, bpos; |
1128 | ||
1129 | if (back == 0) | |
1130 | bpos = bytepos; | |
82ebc97b | 1131 | else |
10f72a37 KH |
1132 | bpos = (NILP (string) ? CHAR_TO_BYTE (cpos) |
1133 | : string_char_to_byte (string, cpos)); | |
1134 | if (STRINGP (AREF (elt, 0))) | |
8f5201ae PE |
1135 | blen = fast_looking_at (AREF (elt, 0), cpos, bpos, |
1136 | start + 1, limit, string); | |
10f72a37 | 1137 | else |
8f5201ae PE |
1138 | blen = 1; |
1139 | if (blen > 0) | |
82ebc97b | 1140 | { |
10f72a37 | 1141 | /* Make CPOS point to the last character of |
8f5201ae PE |
1142 | match. Note that BLEN is byte-length. */ |
1143 | if (blen > 1) | |
10f72a37 | 1144 | { |
8f5201ae | 1145 | bpos += blen; |
10f72a37 KH |
1146 | if (NILP (string)) |
1147 | cpos = BYTE_TO_CHAR (bpos) - 1; | |
1148 | else | |
1149 | cpos = string_byte_to_char (string, bpos) - 1; | |
1150 | } | |
1151 | back = cpos - (charpos - back); | |
1152 | if (cmp_it->stop_pos < cpos | |
1153 | || (cmp_it->stop_pos == cpos | |
1154 | && cmp_it->lookback < back)) | |
1155 | { | |
1156 | cmp_it->rule_idx = ridx; | |
1157 | cmp_it->stop_pos = cpos; | |
1158 | cmp_it->ch = c; | |
1159 | cmp_it->lookback = back; | |
1160 | cmp_it->nchars = back + 1; | |
1161 | } | |
82ebc97b KH |
1162 | } |
1163 | } | |
1164 | } | |
1165 | } | |
1166 | if (charpos - 1 == endpos) | |
1167 | break; | |
1168 | if (STRINGP (string)) | |
58753d74 | 1169 | { |
82ebc97b KH |
1170 | p--, bytepos--; |
1171 | while (! CHAR_HEAD_P (*p)) | |
1172 | p--, bytepos--; | |
1173 | charpos--; | |
1174 | } | |
1175 | else | |
1176 | { | |
1177 | DEC_BOTH (charpos, bytepos); | |
1178 | p = BYTE_POS_ADDR (bytepos); | |
58753d74 | 1179 | } |
82ebc97b KH |
1180 | c = STRING_CHAR (p); |
1181 | } | |
1182 | if (cmp_it->ch >= 0) | |
1183 | /* We found a position to check. */ | |
1184 | return; | |
1185 | /* Skip all uncomposable characters. */ | |
1186 | if (NILP (string)) | |
1187 | { | |
1188 | while (charpos - 1 > endpos && ! CHAR_COMPOSABLE_P (c)) | |
58753d74 | 1189 | { |
82ebc97b KH |
1190 | DEC_BOTH (charpos, bytepos); |
1191 | c = FETCH_MULTIBYTE_CHAR (bytepos); | |
1192 | } | |
1193 | } | |
1194 | else | |
1195 | { | |
1196 | while (charpos - 1 > endpos && ! CHAR_COMPOSABLE_P (c)) | |
1197 | { | |
1198 | p--; | |
1199 | while (! CHAR_HEAD_P (*p)) | |
1200 | p--; | |
1201 | charpos--; | |
1202 | c = STRING_CHAR (p); | |
58753d74 KH |
1203 | } |
1204 | } | |
1205 | } | |
44566dc7 | 1206 | cmp_it->stop_pos = charpos; |
58753d74 KH |
1207 | } |
1208 | ||
1209 | /* Check if the character at CHARPOS (and BYTEPOS) is composed | |
22e33406 | 1210 | (possibly with the following characters) on window W. ENDPOS limits |
58753d74 KH |
1211 | characters to be composed. FACE, in non-NULL, is a base face of |
1212 | the character. If STRING is not nil, it is a string containing the | |
1213 | character to check, and CHARPOS and BYTEPOS are indices in the | |
1214 | string. In that case, FACE must not be NULL. | |
1215 | ||
1216 | If the character is composed, setup members of CMP_IT (id, nglyphs, | |
82ebc97b KH |
1217 | from, to, reversed_p), and return 1. Otherwise, update |
1218 | CMP_IT->stop_pos, and return 0. */ | |
58753d74 KH |
1219 | |
1220 | int | |
971de7fb | 1221 | composition_reseat_it (struct composition_it *cmp_it, EMACS_INT charpos, EMACS_INT bytepos, EMACS_INT endpos, struct window *w, struct face *face, Lisp_Object string) |
58753d74 | 1222 | { |
f6aa6ec6 KH |
1223 | if (endpos < 0) |
1224 | endpos = NILP (string) ? BEGV : 0; | |
e614ea00 | 1225 | |
3ffdafce KH |
1226 | if (cmp_it->ch == -2) |
1227 | { | |
1228 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string); | |
10f72a37 | 1229 | if (cmp_it->ch == -2 || cmp_it->stop_pos != charpos) |
82ebc97b | 1230 | /* The current position is not composed. */ |
3ffdafce KH |
1231 | return 0; |
1232 | } | |
1233 | ||
58753d74 KH |
1234 | if (cmp_it->ch < 0) |
1235 | { | |
1236 | /* We are looking at a static composition. */ | |
1237 | EMACS_INT start, end; | |
1238 | Lisp_Object prop; | |
1239 | ||
1240 | find_composition (charpos, -1, &start, &end, &prop, string); | |
1241 | cmp_it->id = get_composition_id (charpos, bytepos, end - start, | |
1242 | prop, string); | |
1243 | if (cmp_it->id < 0) | |
1244 | goto no_composition; | |
1245 | cmp_it->nchars = end - start; | |
1246 | cmp_it->nglyphs = composition_table[cmp_it->id]->glyph_len; | |
1247 | } | |
29fb7306 | 1248 | else if (w) |
58753d74 | 1249 | { |
10f72a37 | 1250 | Lisp_Object lgstring = Qnil; |
b246f932 PE |
1251 | Lisp_Object val, elt; |
1252 | int i; | |
58753d74 KH |
1253 | |
1254 | val = CHAR_TABLE_REF (Vcomposition_function_table, cmp_it->ch); | |
10f72a37 | 1255 | for (i = 0; i < cmp_it->rule_idx; i++, val = XCDR (val)); |
82ebc97b | 1256 | if (charpos < endpos) |
90b3fe91 | 1257 | { |
82ebc97b KH |
1258 | for (; CONSP (val); val = XCDR (val)) |
1259 | { | |
1260 | elt = XCAR (val); | |
10f72a37 KH |
1261 | if (! VECTORP (elt) || ASIZE (elt) != 3 |
1262 | || ! INTEGERP (AREF (elt, 1))) | |
1263 | continue; | |
1264 | if (XFASTINT (AREF (elt, 1)) != cmp_it->lookback) | |
aa3830c4 | 1265 | goto no_composition; |
10f72a37 KH |
1266 | lgstring = autocmp_chars (elt, charpos, bytepos, endpos, |
1267 | w, face, string); | |
1268 | if (composition_gstring_p (lgstring)) | |
82ebc97b | 1269 | break; |
10f72a37 KH |
1270 | lgstring = Qnil; |
1271 | /* Composition failed perhaps because the font doesn't | |
1272 | support sufficient range of characters. Try the | |
1273 | other composition rules if any. */ | |
82ebc97b | 1274 | } |
82ebc97b | 1275 | cmp_it->reversed_p = 0; |
90b3fe91 | 1276 | } |
82ebc97b KH |
1277 | else |
1278 | { | |
10f72a37 | 1279 | EMACS_INT cpos = charpos, bpos = bytepos; |
90b3fe91 | 1280 | |
10f72a37 | 1281 | while (1) |
82ebc97b | 1282 | { |
10f72a37 KH |
1283 | elt = XCAR (val); |
1284 | if (cmp_it->lookback > 0) | |
1285 | { | |
f6aa6ec6 | 1286 | cpos = charpos - cmp_it->lookback; |
10f72a37 KH |
1287 | if (STRINGP (string)) |
1288 | bpos = string_char_to_byte (string, cpos); | |
1289 | else | |
1290 | bpos = CHAR_TO_BYTE (cpos); | |
1291 | } | |
1292 | lgstring = autocmp_chars (elt, cpos, bpos, charpos + 1, w, face, | |
1293 | string); | |
1294 | if (composition_gstring_p (lgstring) | |
1295 | && cpos + LGSTRING_CHAR_LEN (lgstring) - 1 == charpos) | |
1296 | break; | |
1297 | /* Composition failed or didn't cover the current | |
1298 | character. */ | |
1299 | if (cmp_it->lookback == 0) | |
82ebc97b | 1300 | goto no_composition; |
10f72a37 KH |
1301 | lgstring = Qnil; |
1302 | /* Try to find a shorter compostion that starts after CPOS. */ | |
1303 | composition_compute_stop_pos (cmp_it, charpos, bytepos, cpos, | |
1304 | string); | |
1305 | if (cmp_it->ch == -2 || cmp_it->stop_pos < charpos) | |
1306 | goto no_composition; | |
1307 | val = CHAR_TABLE_REF (Vcomposition_function_table, cmp_it->ch); | |
1308 | for (i = 0; i < cmp_it->rule_idx; i++, val = XCDR (val)); | |
82ebc97b KH |
1309 | } |
1310 | cmp_it->reversed_p = 1; | |
1311 | } | |
10f72a37 KH |
1312 | if (NILP (lgstring)) |
1313 | goto no_composition; | |
1314 | if (NILP (LGSTRING_ID (lgstring))) | |
1315 | lgstring = composition_gstring_put_cache (lgstring, -1); | |
1316 | cmp_it->id = XINT (LGSTRING_ID (lgstring)); | |
1317 | for (i = 0; i < LGSTRING_GLYPH_LEN (lgstring); i++) | |
1318 | if (NILP (LGSTRING_GLYPH (lgstring, i))) | |
58753d74 KH |
1319 | break; |
1320 | cmp_it->nglyphs = i; | |
82ebc97b KH |
1321 | cmp_it->from = 0; |
1322 | cmp_it->to = i; | |
58753d74 | 1323 | } |
29fb7306 KH |
1324 | else |
1325 | goto no_composition; | |
58753d74 KH |
1326 | return 1; |
1327 | ||
1328 | no_composition: | |
82ebc97b KH |
1329 | if (charpos == endpos) |
1330 | return 0; | |
1331 | if (charpos < endpos) | |
1332 | { | |
1333 | charpos++; | |
10f72a37 | 1334 | if (NILP (string)) |
82ebc97b | 1335 | INC_POS (bytepos); |
10f72a37 | 1336 | else |
aa3830c4 | 1337 | bytepos += BYTES_BY_CHAR_HEAD (*(SDATA (string) + bytepos)); |
82ebc97b | 1338 | } |
58753d74 | 1339 | else |
82ebc97b KH |
1340 | { |
1341 | charpos--; | |
1342 | /* BYTEPOS is calculated in composition_compute_stop_pos */ | |
1343 | bytepos = -1; | |
1344 | } | |
58753d74 KH |
1345 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string); |
1346 | return 0; | |
1347 | } | |
1348 | ||
10f72a37 KH |
1349 | /* Update charpos, nchars, nbytes, and width of the current grapheme |
1350 | cluster. | |
1351 | ||
1352 | If the composition is static or automatic in L2R context, the | |
1353 | cluster is identified by CMP_IT->from, and CHARPOS is the position | |
1354 | of the first character of the cluster. In this case, update | |
1355 | CMP_IT->to too. | |
1356 | ||
1357 | If the composition is automatic in R2L context, the cluster is | |
1358 | identified by CMP_IT->to, and CHARPOS is the position of the last | |
1359 | character of the cluster. In this case, update CMP_IT->from too. | |
1360 | ||
1361 | The return value is the character code of the first character of | |
1362 | the cluster, or -1 if the composition is somehow broken. */ | |
82ebc97b | 1363 | |
58753d74 | 1364 | int |
971de7fb | 1365 | composition_update_it (struct composition_it *cmp_it, EMACS_INT charpos, EMACS_INT bytepos, Lisp_Object string) |
58753d74 | 1366 | { |
80e079b2 | 1367 | int i, c IF_LINT (= 0); |
58753d74 KH |
1368 | |
1369 | if (cmp_it->ch < 0) | |
1370 | { | |
10f72a37 | 1371 | /* static composition */ |
58753d74 KH |
1372 | struct composition *cmp = composition_table[cmp_it->id]; |
1373 | ||
10f72a37 | 1374 | cmp_it->charpos = charpos; |
58753d74 KH |
1375 | cmp_it->to = cmp_it->nglyphs; |
1376 | if (cmp_it->nglyphs == 0) | |
1377 | c = -1; | |
1378 | else | |
1379 | { | |
1380 | for (i = 0; i < cmp->glyph_len; i++) | |
1381 | if ((c = COMPOSITION_GLYPH (cmp, i)) != '\t') | |
1382 | break; | |
1383 | if (c == '\t') | |
1384 | c = ' '; | |
1385 | } | |
1386 | cmp_it->width = cmp->width; | |
10f72a37 KH |
1387 | charpos += cmp_it->nchars; |
1388 | if (STRINGP (string)) | |
1389 | cmp_it->nbytes = string_char_to_byte (string, charpos) - bytepos; | |
1390 | else | |
1391 | cmp_it->nbytes = CHAR_TO_BYTE (charpos) - bytepos; | |
58753d74 KH |
1392 | } |
1393 | else | |
1394 | { | |
10f72a37 | 1395 | /* automatic composition */ |
58753d74 | 1396 | Lisp_Object gstring = composition_gstring_from_id (cmp_it->id); |
10f72a37 | 1397 | Lisp_Object glyph; |
579c18d0 | 1398 | EMACS_INT from; |
58753d74 KH |
1399 | |
1400 | if (cmp_it->nglyphs == 0) | |
1401 | { | |
58753d74 KH |
1402 | cmp_it->nchars = LGSTRING_CHAR_LEN (gstring); |
1403 | cmp_it->width = 0; | |
10f72a37 KH |
1404 | cmp_it->from = cmp_it->to = 0; |
1405 | return -1; | |
58753d74 | 1406 | } |
10f72a37 | 1407 | if (! cmp_it->reversed_p) |
58753d74 | 1408 | { |
10f72a37 KH |
1409 | glyph = LGSTRING_GLYPH (gstring, cmp_it->from); |
1410 | from = LGLYPH_FROM (glyph); | |
58753d74 KH |
1411 | for (cmp_it->to = cmp_it->from + 1; cmp_it->to < cmp_it->nglyphs; |
1412 | cmp_it->to++) | |
1413 | { | |
1414 | glyph = LGSTRING_GLYPH (gstring, cmp_it->to); | |
1415 | if (LGLYPH_FROM (glyph) != from) | |
1416 | break; | |
58753d74 | 1417 | } |
10f72a37 | 1418 | cmp_it->charpos = charpos; |
58753d74 | 1419 | } |
82ebc97b KH |
1420 | else |
1421 | { | |
10f72a37 KH |
1422 | glyph = LGSTRING_GLYPH (gstring, cmp_it->to - 1); |
1423 | from = LGLYPH_FROM (glyph); | |
1424 | cmp_it->charpos = charpos - (LGLYPH_TO (glyph) - from); | |
1425 | for (cmp_it->from = cmp_it->to - 1; cmp_it->from > 0; | |
1426 | cmp_it->from--) | |
82ebc97b | 1427 | { |
10f72a37 | 1428 | glyph = LGSTRING_GLYPH (gstring, cmp_it->from - 1); |
82ebc97b KH |
1429 | if (LGLYPH_FROM (glyph) != from) |
1430 | break; | |
82ebc97b | 1431 | } |
10f72a37 KH |
1432 | } |
1433 | glyph = LGSTRING_GLYPH (gstring, cmp_it->from); | |
1434 | cmp_it->nchars = LGLYPH_TO (glyph) + 1 - from; | |
1435 | cmp_it->nbytes = 0; | |
1436 | cmp_it->width = 0; | |
1437 | for (i = cmp_it->nchars - 1; i >= 0; i--) | |
1438 | { | |
1439 | c = XINT (LGSTRING_CHAR (gstring, i)); | |
1440 | cmp_it->nbytes += CHAR_BYTES (c); | |
63257f6c | 1441 | cmp_it->width += CHAR_WIDTH (c); |
82ebc97b | 1442 | } |
58753d74 | 1443 | } |
58753d74 KH |
1444 | return c; |
1445 | } | |
1446 | ||
1447 | ||
90b3fe91 KH |
1448 | struct position_record |
1449 | { | |
1450 | EMACS_INT pos, pos_byte; | |
1451 | unsigned char *p; | |
1452 | }; | |
1453 | ||
763d7377 | 1454 | /* Update the members of POSITION to the next character boundary. */ |
90b3fe91 KH |
1455 | #define FORWARD_CHAR(POSITION, STOP) \ |
1456 | do { \ | |
90b3fe91 | 1457 | (POSITION).pos++; \ |
900c4486 KH |
1458 | if ((POSITION).pos == (STOP)) \ |
1459 | { \ | |
1460 | (POSITION).p = GAP_END_ADDR; \ | |
1461 | (POSITION).pos_byte = GPT_BYTE; \ | |
1462 | } \ | |
1463 | else \ | |
1464 | { \ | |
900c4486 | 1465 | (POSITION).pos_byte += BYTES_BY_CHAR_HEAD (*((POSITION).p)); \ |
d45a49e3 | 1466 | (POSITION).p += BYTES_BY_CHAR_HEAD (*((POSITION).p)); \ |
900c4486 | 1467 | } \ |
90b3fe91 KH |
1468 | } while (0) |
1469 | ||
763d7377 | 1470 | /* Update the members of POSITION to the previous character boundary. */ |
90b3fe91 KH |
1471 | #define BACKWARD_CHAR(POSITION, STOP) \ |
1472 | do { \ | |
1473 | if ((POSITION).pos == STOP) \ | |
1474 | (POSITION).p = GPT_ADDR; \ | |
1475 | do { \ | |
1476 | (POSITION).pos_byte--; \ | |
1477 | (POSITION).p--; \ | |
1478 | } while (! CHAR_HEAD_P (*((POSITION).p))); \ | |
1479 | (POSITION).pos--; \ | |
1480 | } while (0) | |
1481 | ||
90b3fe91 KH |
1482 | /* This is like find_composition, but find an automatic composition |
1483 | instead. If found, set *GSTRING to the glyph-string representing | |
1484 | the composition, and return 1. Otherwise, return 0. */ | |
1485 | ||
1486 | static int | |
971de7fb | 1487 | find_automatic_composition (EMACS_INT pos, EMACS_INT limit, EMACS_INT *start, EMACS_INT *end, Lisp_Object *gstring, Lisp_Object string) |
90b3fe91 KH |
1488 | { |
1489 | EMACS_INT head, tail, stop; | |
895416e3 KH |
1490 | /* Limit to check a composition after POS. */ |
1491 | EMACS_INT fore_check_limit; | |
8e52e652 PE |
1492 | struct position_record orig, cur; |
1493 | ||
1494 | /* FIXME: It's not obvious whether these two variables need initialization. | |
1495 | If they do, please supply initial values. | |
1496 | If not, please remove this comment. */ | |
1497 | struct position_record check IF_LINT (= {0}), prev IF_LINT (= {0}); | |
1498 | ||
90b3fe91 | 1499 | Lisp_Object check_val, val, elt; |
90b3fe91 | 1500 | int c; |
29fb7306 | 1501 | Lisp_Object window; |
90b3fe91 KH |
1502 | struct window *w; |
1503 | ||
3eda4b19 | 1504 | window = Fget_buffer_window (Fcurrent_buffer (), Qnil); |
29fb7306 KH |
1505 | if (NILP (window)) |
1506 | return 0; | |
1507 | w = XWINDOW (window); | |
1508 | ||
90b3fe91 KH |
1509 | orig.pos = pos; |
1510 | if (NILP (string)) | |
1511 | { | |
1512 | head = BEGV, tail = ZV, stop = GPT; | |
1513 | orig.pos_byte = CHAR_TO_BYTE (orig.pos); | |
1514 | orig.p = BYTE_POS_ADDR (orig.pos_byte); | |
1515 | } | |
1516 | else | |
1517 | { | |
1518 | head = 0, tail = SCHARS (string), stop = -1; | |
1519 | orig.pos_byte = string_char_to_byte (string, orig.pos); | |
1520 | orig.p = SDATA (string) + orig.pos_byte; | |
1521 | } | |
1522 | if (limit < pos) | |
895416e3 | 1523 | fore_check_limit = min (tail, pos + MAX_AUTO_COMPOSITION_LOOKBACK); |
90b3fe91 | 1524 | else |
895416e3 | 1525 | fore_check_limit = min (tail, limit + MAX_AUTO_COMPOSITION_LOOKBACK); |
90b3fe91 KH |
1526 | cur = orig; |
1527 | ||
1528 | retry: | |
1529 | check_val = Qnil; | |
895416e3 | 1530 | /* At first, check if POS is composable. */ |
62a6e103 | 1531 | c = STRING_CHAR (cur.p); |
90b3fe91 KH |
1532 | if (! CHAR_COMPOSABLE_P (c)) |
1533 | { | |
1534 | if (limit < 0) | |
1535 | return 0; | |
1536 | if (limit >= cur.pos) | |
1537 | goto search_forward; | |
1538 | } | |
1539 | else | |
1540 | { | |
1541 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1542 | if (! NILP (val)) | |
1543 | check_val = val, check = cur; | |
1544 | else | |
895416e3 | 1545 | while (cur.pos + 1 < fore_check_limit) |
90b3fe91 | 1546 | { |
895416e3 KH |
1547 | EMACS_INT b, e; |
1548 | ||
90b3fe91 | 1549 | FORWARD_CHAR (cur, stop); |
895416e3 KH |
1550 | if (get_property_and_range (cur.pos, Qcomposition, &val, &b, &e, |
1551 | Qnil) | |
1552 | && COMPOSITION_VALID_P (b, e, val)) | |
1553 | { | |
1554 | fore_check_limit = cur.pos; | |
1555 | break; | |
1556 | } | |
62a6e103 | 1557 | c = STRING_CHAR (cur.p); |
90b3fe91 KH |
1558 | if (! CHAR_COMPOSABLE_P (c)) |
1559 | break; | |
1560 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1561 | if (NILP (val)) | |
1562 | continue; | |
1563 | check_val = val, check = cur; | |
1564 | break; | |
1565 | } | |
1566 | cur = orig; | |
1567 | } | |
1568 | /* Rewind back to the position where we can safely search forward | |
1569 | for compositions. */ | |
1570 | while (cur.pos > head) | |
1571 | { | |
895416e3 KH |
1572 | EMACS_INT b, e; |
1573 | ||
90b3fe91 | 1574 | BACKWARD_CHAR (cur, stop); |
895416e3 KH |
1575 | if (get_property_and_range (cur.pos, Qcomposition, &val, &b, &e, Qnil) |
1576 | && COMPOSITION_VALID_P (b, e, val)) | |
1577 | break; | |
62a6e103 | 1578 | c = STRING_CHAR (cur.p); |
90b3fe91 KH |
1579 | if (! CHAR_COMPOSABLE_P (c)) |
1580 | break; | |
1581 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1582 | if (! NILP (val)) | |
1583 | check_val = val, check = cur; | |
1584 | } | |
1585 | prev = cur; | |
1586 | /* Now search forward. */ | |
087e2ea9 | 1587 | search_forward: |
90b3fe91 KH |
1588 | *gstring = Qnil; |
1589 | if (! NILP (check_val) || limit >= orig.pos) | |
1590 | { | |
1591 | if (NILP (check_val)) | |
1592 | cur = orig; | |
1593 | else | |
1594 | cur = check; | |
895416e3 | 1595 | while (cur.pos < fore_check_limit) |
90b3fe91 KH |
1596 | { |
1597 | int need_adjustment = 0; | |
1598 | ||
1599 | if (NILP (check_val)) | |
1600 | { | |
62a6e103 | 1601 | c = STRING_CHAR (cur.p); |
90b3fe91 KH |
1602 | check_val = CHAR_TABLE_REF (Vcomposition_function_table, c); |
1603 | } | |
1604 | for (; CONSP (check_val); check_val = XCDR (check_val)) | |
1605 | { | |
1606 | elt = XCAR (check_val); | |
1607 | if (VECTORP (elt) && ASIZE (elt) == 3 && NATNUMP (AREF (elt, 1)) | |
1608 | && cur.pos - XFASTINT (AREF (elt, 1)) >= head) | |
1609 | { | |
1610 | check.pos = cur.pos - XFASTINT (AREF (elt, 1)); | |
1611 | if (check.pos == cur.pos) | |
1612 | check.pos_byte = cur.pos_byte; | |
1613 | else | |
1614 | check.pos_byte = CHAR_TO_BYTE (check.pos); | |
10f72a37 | 1615 | val = autocmp_chars (elt, check.pos, check.pos_byte, |
90b3fe91 KH |
1616 | tail, w, NULL, string); |
1617 | need_adjustment = 1; | |
1618 | if (! NILP (val)) | |
1619 | { | |
1620 | *gstring = val; | |
1621 | *start = check.pos; | |
1622 | *end = check.pos + LGSTRING_CHAR_LEN (*gstring); | |
1623 | if (*start <= orig.pos ? *end > orig.pos | |
1624 | : limit >= orig.pos) | |
1625 | return 1; | |
1626 | cur.pos = *end; | |
1627 | cur.pos_byte = CHAR_TO_BYTE (cur.pos); | |
1628 | break; | |
1629 | } | |
1630 | } | |
1631 | } | |
1632 | if (need_adjustment) | |
1633 | { | |
763d7377 | 1634 | /* As we have called Lisp, there's a possibility that |
90b3fe91 KH |
1635 | buffer/string is relocated. */ |
1636 | if (NILP (string)) | |
1637 | cur.p = BYTE_POS_ADDR (cur.pos_byte); | |
1638 | else | |
1639 | cur.p = SDATA (string) + cur.pos_byte; | |
1640 | } | |
1641 | if (! CONSP (check_val)) | |
1642 | FORWARD_CHAR (cur, stop); | |
1643 | check_val = Qnil; | |
1644 | } | |
1645 | } | |
1646 | if (! NILP (*gstring)) | |
1647 | return (limit >= 0 || (*start <= orig.pos && *end > orig.pos)); | |
1648 | if (limit >= 0 && limit < orig.pos && prev.pos > head) | |
1649 | { | |
1650 | cur = prev; | |
1651 | BACKWARD_CHAR (cur, stop); | |
1652 | orig = cur; | |
895416e3 | 1653 | fore_check_limit = orig.pos; |
90b3fe91 KH |
1654 | goto retry; |
1655 | } | |
1656 | return 0; | |
1657 | } | |
1658 | ||
e614ea00 KH |
1659 | /* Return the adjusted point provided that point is moved from LAST_PT |
1660 | to NEW_PT. */ | |
1661 | ||
41118bd3 | 1662 | EMACS_INT |
971de7fb | 1663 | composition_adjust_point (EMACS_INT last_pt, EMACS_INT new_pt) |
58753d74 | 1664 | { |
b246f932 | 1665 | EMACS_INT beg, end; |
90b3fe91 KH |
1666 | Lisp_Object val; |
1667 | int i; | |
58753d74 | 1668 | |
e614ea00 KH |
1669 | if (new_pt == BEGV || new_pt == ZV) |
1670 | return new_pt; | |
58753d74 | 1671 | |
90b3fe91 | 1672 | /* At first check the static composition. */ |
e614ea00 | 1673 | if (get_property_and_range (new_pt, Qcomposition, &val, &beg, &end, Qnil) |
895416e3 KH |
1674 | && COMPOSITION_VALID_P (beg, end, val)) |
1675 | { | |
e614ea00 | 1676 | if (beg < new_pt /* && end > new_pt <- It's always the case. */ |
895416e3 | 1677 | && (last_pt <= beg || last_pt >= end)) |
e614ea00 KH |
1678 | return (new_pt < last_pt ? beg : end); |
1679 | return new_pt; | |
895416e3 | 1680 | } |
58753d74 | 1681 | |
4b4deea2 | 1682 | if (NILP (BVAR (current_buffer, enable_multibyte_characters)) |
d9a7c140 | 1683 | || NILP (Vauto_composition_mode)) |
e614ea00 | 1684 | return new_pt; |
58753d74 | 1685 | |
90b3fe91 | 1686 | /* Next check the automatic composition. */ |
e614ea00 KH |
1687 | if (! find_automatic_composition (new_pt, (EMACS_INT) -1, &beg, &end, &val, |
1688 | Qnil) | |
1689 | || beg == new_pt) | |
1690 | return new_pt; | |
90b3fe91 | 1691 | for (i = 0; i < LGSTRING_GLYPH_LEN (val); i++) |
58753d74 | 1692 | { |
90b3fe91 | 1693 | Lisp_Object glyph = LGSTRING_GLYPH (val, i); |
58753d74 | 1694 | |
90b3fe91 KH |
1695 | if (NILP (glyph)) |
1696 | break; | |
e614ea00 KH |
1697 | if (beg + LGLYPH_FROM (glyph) == new_pt) |
1698 | return new_pt; | |
1699 | if (beg + LGLYPH_TO (glyph) >= new_pt) | |
1700 | return (new_pt < last_pt | |
90b3fe91 KH |
1701 | ? beg + LGLYPH_FROM (glyph) |
1702 | : beg + LGLYPH_TO (glyph) + 1); | |
58753d74 | 1703 | } |
e614ea00 | 1704 | return new_pt; |
58753d74 KH |
1705 | } |
1706 | ||
1707 | DEFUN ("composition-get-gstring", Fcomposition_get_gstring, | |
1708 | Scomposition_get_gstring, 4, 4, 0, | |
1709 | doc: /* Return a glyph-string for characters between FROM and TO. | |
9d751859 | 1710 | If the glyph string is for graphic display, FONT-OBJECT must be |
58753d74 | 1711 | a font-object to use for those characters. |
f5199465 KH |
1712 | Otherwise (for terminal display), FONT-OBJECT must be a terminal ID, a |
1713 | frame, or nil for the selected frame's terminal device. | |
58753d74 KH |
1714 | |
1715 | If the optional 4th argument STRING is not nil, it is a string | |
1716 | containing the target characters between indices FROM and TO. | |
1717 | ||
9d751859 EZ |
1718 | A glyph-string is a vector containing information about how to display |
1719 | a specific character sequence. The format is: | |
58753d74 KH |
1720 | [HEADER ID GLYPH ...] |
1721 | ||
1722 | HEADER is a vector of this form: | |
1723 | [FONT-OBJECT CHAR ...] | |
1724 | where | |
1725 | FONT-OBJECT is a font-object for all glyphs in the glyph-string, | |
f5199465 | 1726 | or the terminal coding system of the specified terminal. |
58753d74 KH |
1727 | CHARs are characters to be composed by GLYPHs. |
1728 | ||
1729 | ID is an identification number of the glyph-string. It may be nil if | |
1730 | not yet shaped. | |
1731 | ||
9d751859 | 1732 | GLYPH is a vector whose elements have this form: |
58753d74 KH |
1733 | [ FROM-IDX TO-IDX C CODE WIDTH LBEARING RBEARING ASCENT DESCENT |
1734 | [ [X-OFF Y-OFF WADJUST] | nil] ] | |
1735 | where | |
1736 | FROM-IDX and TO-IDX are used internally and should not be touched. | |
1737 | C is the character of the glyph. | |
1738 | CODE is the glyph-code of C in FONT-OBJECT. | |
1739 | WIDTH thru DESCENT are the metrics (in pixels) of the glyph. | |
9d751859 | 1740 | X-OFF and Y-OFF are offsets to the base position for the glyph. |
58753d74 KH |
1741 | WADJUST is the adjustment to the normal width of the glyph. |
1742 | ||
9d751859 EZ |
1743 | If GLYPH is nil, the remaining elements of the glyph-string vector |
1744 | should be ignored. */) | |
5842a27b | 1745 | (Lisp_Object from, Lisp_Object to, Lisp_Object font_object, Lisp_Object string) |
58753d74 KH |
1746 | { |
1747 | Lisp_Object gstring, header; | |
46f905e1 | 1748 | EMACS_INT frompos, topos; |
58753d74 | 1749 | |
ea8ba975 KH |
1750 | CHECK_NATNUM (from); |
1751 | CHECK_NATNUM (to); | |
f5199465 KH |
1752 | if (! FONT_OBJECT_P (font_object)) |
1753 | { | |
1754 | struct coding_system *coding; | |
1755 | struct terminal *terminal = get_terminal (font_object, 1); | |
1756 | ||
1757 | coding = ((TERMINAL_TERMINAL_CODING (terminal)->common_flags | |
1758 | & CODING_REQUIRE_ENCODING_MASK) | |
1759 | ? TERMINAL_TERMINAL_CODING (terminal) : &safe_terminal_coding); | |
1760 | font_object = CODING_ID_NAME (coding->id); | |
1761 | } | |
1762 | ||
58753d74 KH |
1763 | header = fill_gstring_header (Qnil, from, to, font_object, string); |
1764 | gstring = gstring_lookup_cache (header); | |
1765 | if (! NILP (gstring)) | |
1766 | return gstring; | |
46f905e1 | 1767 | |
ea8ba975 KH |
1768 | frompos = XINT (from); |
1769 | topos = XINT (to); | |
46f905e1 SM |
1770 | if (LGSTRING_GLYPH_LEN (gstring_work) < topos - frompos) |
1771 | gstring_work = Fmake_vector (make_number (topos - frompos + 2), Qnil); | |
58753d74 KH |
1772 | LGSTRING_SET_HEADER (gstring_work, header); |
1773 | LGSTRING_SET_ID (gstring_work, Qnil); | |
1774 | fill_gstring_body (gstring_work); | |
1775 | return gstring_work; | |
1776 | } | |
1777 | ||
ca4c9455 KH |
1778 | \f |
1779 | /* Emacs Lisp APIs. */ | |
1780 | ||
1781 | DEFUN ("compose-region-internal", Fcompose_region_internal, | |
1782 | Scompose_region_internal, 2, 4, 0, | |
335c5470 PJ |
1783 | doc: /* Internal use only. |
1784 | ||
1785 | Compose text in the region between START and END. | |
1786 | Optional 3rd and 4th arguments are COMPONENTS and MODIFICATION-FUNC | |
9d751859 | 1787 | for the composition. See `compose-region' for more details. */) |
5842a27b | 1788 | (Lisp_Object start, Lisp_Object end, Lisp_Object components, Lisp_Object modification_func) |
ca4c9455 KH |
1789 | { |
1790 | validate_region (&start, &end); | |
1791 | if (!NILP (components) | |
1792 | && !INTEGERP (components) | |
1793 | && !CONSP (components) | |
1794 | && !STRINGP (components)) | |
b7826503 | 1795 | CHECK_VECTOR (components); |
ca4c9455 | 1796 | |
d562f8ab | 1797 | compose_text (XINT (start), XINT (end), components, modification_func, Qnil); |
ca4c9455 KH |
1798 | return Qnil; |
1799 | } | |
1800 | ||
1801 | DEFUN ("compose-string-internal", Fcompose_string_internal, | |
1802 | Scompose_string_internal, 3, 5, 0, | |
335c5470 PJ |
1803 | doc: /* Internal use only. |
1804 | ||
1805 | Compose text between indices START and END of STRING. | |
1806 | Optional 4th and 5th arguments are COMPONENTS and MODIFICATION-FUNC | |
9d751859 | 1807 | for the composition. See `compose-string' for more details. */) |
5842a27b | 1808 | (Lisp_Object string, Lisp_Object start, Lisp_Object end, Lisp_Object components, Lisp_Object modification_func) |
ca4c9455 | 1809 | { |
b7826503 PJ |
1810 | CHECK_STRING (string); |
1811 | CHECK_NUMBER (start); | |
1812 | CHECK_NUMBER (end); | |
ca4c9455 KH |
1813 | |
1814 | if (XINT (start) < 0 || | |
1815 | XINT (start) > XINT (end) | |
d5db4077 | 1816 | || XINT (end) > SCHARS (string)) |
ca4c9455 KH |
1817 | args_out_of_range (start, end); |
1818 | ||
d562f8ab | 1819 | compose_text (XINT (start), XINT (end), components, modification_func, string); |
ca4c9455 KH |
1820 | return string; |
1821 | } | |
1822 | ||
1823 | DEFUN ("find-composition-internal", Ffind_composition_internal, | |
177c0ea7 | 1824 | Sfind_composition_internal, 4, 4, 0, |
335c5470 PJ |
1825 | doc: /* Internal use only. |
1826 | ||
1827 | Return information about composition at or nearest to position POS. | |
9d751859 | 1828 | See `find-composition' for more details. */) |
5842a27b | 1829 | (Lisp_Object pos, Lisp_Object limit, Lisp_Object string, Lisp_Object detail_p) |
ca4c9455 | 1830 | { |
90b3fe91 KH |
1831 | Lisp_Object prop, tail, gstring; |
1832 | EMACS_INT start, end, from, to; | |
ca4c9455 KH |
1833 | int id; |
1834 | ||
b7826503 | 1835 | CHECK_NUMBER_COERCE_MARKER (pos); |
90b3fe91 | 1836 | from = XINT (pos); |
ca4c9455 KH |
1837 | if (!NILP (limit)) |
1838 | { | |
b7826503 | 1839 | CHECK_NUMBER_COERCE_MARKER (limit); |
90b3fe91 | 1840 | to = XINT (limit); |
ca4c9455 KH |
1841 | } |
1842 | else | |
90b3fe91 | 1843 | to = -1; |
177c0ea7 | 1844 | |
ca4c9455 | 1845 | if (!NILP (string)) |
e3b3e327 | 1846 | { |
b7826503 | 1847 | CHECK_STRING (string); |
d5db4077 | 1848 | if (XINT (pos) < 0 || XINT (pos) > SCHARS (string)) |
e3b3e327 GM |
1849 | args_out_of_range (string, pos); |
1850 | } | |
1851 | else | |
1852 | { | |
fa9090b8 | 1853 | if (XINT (pos) < BEGV || XINT (pos) > ZV) |
e3b3e327 GM |
1854 | args_out_of_range (Fcurrent_buffer (), pos); |
1855 | } | |
ca4c9455 | 1856 | |
90b3fe91 KH |
1857 | if (!find_composition (from, to, &start, &end, &prop, string)) |
1858 | { | |
4b4deea2 | 1859 | if (!NILP (BVAR (current_buffer, enable_multibyte_characters)) |
d9a7c140 | 1860 | && ! NILP (Vauto_composition_mode) |
90b3fe91 KH |
1861 | && find_automatic_composition (from, to, &start, &end, &gstring, |
1862 | string)) | |
1863 | return list3 (make_number (start), make_number (end), gstring); | |
1864 | return Qnil; | |
1865 | } | |
1866 | if ((end <= XINT (pos) || start > XINT (pos))) | |
1867 | { | |
1868 | EMACS_INT s, e; | |
1869 | ||
1870 | if (find_automatic_composition (from, to, &s, &e, &gstring, string) | |
1871 | && (e <= XINT (pos) ? e > end : s < start)) | |
fcebfc6a | 1872 | return list3 (make_number (s), make_number (e), gstring); |
90b3fe91 | 1873 | } |
ca4c9455 KH |
1874 | if (!COMPOSITION_VALID_P (start, end, prop)) |
1875 | return Fcons (make_number (start), Fcons (make_number (end), | |
1876 | Fcons (Qnil, Qnil))); | |
1877 | if (NILP (detail_p)) | |
1878 | return Fcons (make_number (start), Fcons (make_number (end), | |
1879 | Fcons (Qt, Qnil))); | |
1880 | ||
1881 | if (COMPOSITION_REGISTERD_P (prop)) | |
1882 | id = COMPOSITION_ID (prop); | |
1883 | else | |
1884 | { | |
579c18d0 EZ |
1885 | EMACS_INT start_byte = (NILP (string) |
1886 | ? CHAR_TO_BYTE (start) | |
1887 | : string_char_to_byte (string, start)); | |
ca4c9455 KH |
1888 | id = get_composition_id (start, start_byte, end - start, prop, string); |
1889 | } | |
1890 | ||
1891 | if (id >= 0) | |
1892 | { | |
1893 | Lisp_Object components, relative_p, mod_func; | |
1894 | enum composition_method method = COMPOSITION_METHOD (prop); | |
1895 | int width = composition_table[id]->width; | |
1896 | ||
1897 | components = Fcopy_sequence (COMPOSITION_COMPONENTS (prop)); | |
1898 | relative_p = (method == COMPOSITION_WITH_RULE_ALTCHARS | |
1899 | ? Qnil : Qt); | |
1900 | mod_func = COMPOSITION_MODIFICATION_FUNC (prop); | |
1901 | tail = Fcons (components, | |
1902 | Fcons (relative_p, | |
1903 | Fcons (mod_func, | |
1904 | Fcons (make_number (width), Qnil)))); | |
1905 | } | |
1906 | else | |
1907 | tail = Qnil; | |
1908 | ||
1909 | return Fcons (make_number (start), Fcons (make_number (end), tail)); | |
1910 | } | |
1911 | ||
1912 | \f | |
1913 | void | |
971de7fb | 1914 | syms_of_composite (void) |
ca4c9455 | 1915 | { |
58753d74 KH |
1916 | int i; |
1917 | ||
d67b4f80 | 1918 | Qcomposition = intern_c_string ("composition"); |
ca4c9455 KH |
1919 | staticpro (&Qcomposition); |
1920 | ||
58753d74 | 1921 | /* Make a hash table for static composition. */ |
ca4c9455 | 1922 | { |
09654086 | 1923 | Lisp_Object args[6]; |
177c0ea7 | 1924 | |
ca4c9455 KH |
1925 | args[0] = QCtest; |
1926 | args[1] = Qequal; | |
1927 | args[2] = QCweakness; | |
dc47eccc | 1928 | /* We used to make the hash table weak so that unreferenced |
ca101cff | 1929 | compositions can be garbage-collected. But, usually once |
dc47eccc KH |
1930 | created compositions are repeatedly used in an Emacs session, |
1931 | and thus it's not worth to save memory in such a way. So, we | |
1932 | make the table not weak. */ | |
6a83ee8a | 1933 | args[3] = Qnil; |
ca4c9455 KH |
1934 | args[4] = QCsize; |
1935 | args[5] = make_number (311); | |
09654086 | 1936 | composition_hash_table = Fmake_hash_table (6, args); |
ca4c9455 KH |
1937 | staticpro (&composition_hash_table); |
1938 | } | |
1939 | ||
58753d74 KH |
1940 | /* Make a hash table for glyph-string. */ |
1941 | { | |
1942 | Lisp_Object args[6]; | |
58753d74 KH |
1943 | args[0] = QCtest; |
1944 | args[1] = Qequal; | |
1945 | args[2] = QCweakness; | |
1946 | args[3] = Qnil; | |
1947 | args[4] = QCsize; | |
1948 | args[5] = make_number (311); | |
1949 | gstring_hash_table = Fmake_hash_table (6, args); | |
1950 | staticpro (&gstring_hash_table); | |
1951 | } | |
1952 | ||
1953 | staticpro (&gstring_work_headers); | |
1954 | gstring_work_headers = Fmake_vector (make_number (8), Qnil); | |
1955 | for (i = 0; i < 8; i++) | |
1956 | ASET (gstring_work_headers, i, Fmake_vector (make_number (i + 2), Qnil)); | |
1957 | staticpro (&gstring_work); | |
1958 | gstring_work = Fmake_vector (make_number (10), Qnil); | |
1959 | ||
ca4c9455 KH |
1960 | /* Text property `composition' should be nonsticky by default. */ |
1961 | Vtext_property_default_nonsticky | |
1962 | = Fcons (Fcons (Qcomposition, Qt), Vtext_property_default_nonsticky); | |
1963 | ||
29208e82 | 1964 | DEFVAR_LISP ("compose-chars-after-function", Vcompose_chars_after_function, |
335c5470 PJ |
1965 | doc: /* Function to adjust composition of buffer text. |
1966 | ||
9d751859 EZ |
1967 | This function is called with three arguments: FROM, TO, and OBJECT. |
1968 | FROM and TO specify the range of text whose composition should be | |
335c5470 PJ |
1969 | adjusted. OBJECT, if non-nil, is a string that contains the text. |
1970 | ||
1971 | This function is called after a text with `composition' property is | |
1972 | inserted or deleted to keep `composition' property of buffer text | |
1973 | valid. | |
1974 | ||
1975 | The default value is the function `compose-chars-after'. */); | |
d67b4f80 | 1976 | Vcompose_chars_after_function = intern_c_string ("compose-chars-after"); |
ca4c9455 | 1977 | |
d67b4f80 | 1978 | Qauto_composed = intern_c_string ("auto-composed"); |
f96ba4c1 | 1979 | staticpro (&Qauto_composed); |
40add26d | 1980 | |
d67b4f80 | 1981 | Qauto_composition_function = intern_c_string ("auto-composition-function"); |
f96ba4c1 | 1982 | staticpro (&Qauto_composition_function); |
40add26d | 1983 | |
29208e82 | 1984 | DEFVAR_LISP ("auto-composition-mode", Vauto_composition_mode, |
d9a7c140 KH |
1985 | doc: /* Non-nil if Auto-Composition mode is enabled. |
1986 | Use the command `auto-composition-mode' to change this variable. */); | |
1987 | Vauto_composition_mode = Qt; | |
1988 | ||
29208e82 | 1989 | DEFVAR_LISP ("auto-composition-function", Vauto_composition_function, |
f96ba4c1 | 1990 | doc: /* Function to call to compose characters automatically. |
9d751859 | 1991 | This function is called from the display routine with four arguments: |
ddc872ba | 1992 | FROM, TO, WINDOW, and STRING. |
335c5470 | 1993 | |
ddc872ba KH |
1994 | If STRING is nil, the function must compose characters in the region |
1995 | between FROM and TO in the current buffer. | |
335c5470 | 1996 | |
ddc872ba KH |
1997 | Otherwise, STRING is a string, and FROM and TO are indices into the |
1998 | string. In this case, the function must compose characters in the | |
1999 | string. */); | |
f96ba4c1 | 2000 | Vauto_composition_function = Qnil; |
40add26d | 2001 | |
29208e82 | 2002 | DEFVAR_LISP ("composition-function-table", Vcomposition_function_table, |
9d751859 | 2003 | doc: /* Char-table of functions for automatic character composition. |
58753d74 KH |
2004 | For each character that has to be composed automatically with |
2005 | preceding and/or following characters, this char-table contains | |
2006 | a function to call to compose that character. | |
2007 | ||
2008 | The element at index C in the table, if non-nil, is a list of | |
10f72a37 | 2009 | composition rules of this form: ([PATTERN PREV-CHARS FUNC] ...) |
58753d74 | 2010 | |
9d751859 | 2011 | PATTERN is a regular expression which C and the surrounding |
58753d74 KH |
2012 | characters must match. |
2013 | ||
895416e3 KH |
2014 | PREV-CHARS is a non-negative integer (less than 4) specifying how many |
2015 | characters before C to check the matching with PATTERN. If it is 0, | |
2016 | PATTERN must match C and the following characters. If it is 1, | |
2017 | PATTERN must match a character before C and the following characters. | |
58753d74 KH |
2018 | |
2019 | If PREV-CHARS is 0, PATTERN can be nil, which means that the | |
2020 | single character C should be composed. | |
2021 | ||
2022 | FUNC is a function to return a glyph-string representing a | |
9d751859 | 2023 | composition of the characters that match PATTERN. It is |
58753d74 KH |
2024 | called with one argument GSTRING. |
2025 | ||
2026 | GSTRING is a template of a glyph-string to return. It is already | |
2027 | filled with a proper header for the characters to compose, and | |
2028 | glyphs corresponding to those characters one by one. The | |
9d751859 | 2029 | function must return a new glyph-string with the same header as |
58753d74 KH |
2030 | GSTRING, or modify GSTRING itself and return it. |
2031 | ||
2032 | See also the documentation of `auto-composition-mode'. */); | |
2033 | Vcomposition_function_table = Fmake_char_table (Qnil, Qnil); | |
2034 | ||
ca4c9455 KH |
2035 | defsubr (&Scompose_region_internal); |
2036 | defsubr (&Scompose_string_internal); | |
2037 | defsubr (&Sfind_composition_internal); | |
58753d74 | 2038 | defsubr (&Scomposition_get_gstring); |
ca4c9455 | 2039 | } |