Commit | Line | Data |
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ca4c9455 | 1 | /* Composite sequence support. |
ba318903 | 2 | Copyright (C) 2001-2014 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> | |
f162bcc3 | 26 | |
ca4c9455 | 27 | #include "lisp.h" |
1527c36e | 28 | #include "character.h" |
e5560ff7 | 29 | #include "buffer.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'. */ | |
ebfa62c0 | 145 | static ptrdiff_t composition_table_size; |
ca4c9455 KH |
146 | |
147 | /* Number of compositions currently made. */ | |
ebfa62c0 | 148 | ptrdiff_t n_compositions; |
ca4c9455 KH |
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 | ||
955cbe7b PE |
155 | static Lisp_Object Qauto_composed; |
156 | static 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 | ||
ca4c9455 KH |
161 | /* Return COMPOSITION-ID of a composition at buffer position |
162 | CHARPOS/BYTEPOS and length NCHARS. The `composition' property of | |
163 | the sequence is PROP. STRING, if non-nil, is a string that | |
164 | contains the composition instead of the current buffer. | |
165 | ||
166 | If the composition is invalid, return -1. */ | |
167 | ||
ebfa62c0 | 168 | ptrdiff_t |
d311d28c | 169 | get_composition_id (ptrdiff_t charpos, ptrdiff_t bytepos, ptrdiff_t nchars, |
579c18d0 | 170 | Lisp_Object prop, Lisp_Object string) |
ca4c9455 KH |
171 | { |
172 | Lisp_Object id, length, components, key, *key_contents; | |
d86d0d74 | 173 | ptrdiff_t glyph_len; |
ca4c9455 | 174 | struct Lisp_Hash_Table *hash_table = XHASH_TABLE (composition_hash_table); |
d3411f89 | 175 | ptrdiff_t hash_index; |
0de4bb68 | 176 | EMACS_UINT hash_code; |
d86d0d74 | 177 | enum composition_method method; |
ca4c9455 | 178 | struct composition *cmp; |
d311d28c | 179 | ptrdiff_t i; |
579c18d0 | 180 | int ch; |
ca4c9455 | 181 | |
0065d054 PE |
182 | /* Maximum length of a string of glyphs. XftGlyphExtents limits |
183 | this to INT_MAX, and Emacs limits it further. Divide INT_MAX - 1 | |
184 | by 2 because x_produce_glyphs computes glyph_len * 2 + 1. Divide | |
185 | the size by MAX_MULTIBYTE_LENGTH because encode_terminal_code | |
186 | multiplies glyph_len by MAX_MULTIBYTE_LENGTH. */ | |
d86d0d74 | 187 | enum { |
0065d054 PE |
188 | GLYPH_LEN_MAX = min ((INT_MAX - 1) / 2, |
189 | min (PTRDIFF_MAX, SIZE_MAX) / MAX_MULTIBYTE_LENGTH) | |
d86d0d74 PE |
190 | }; |
191 | ||
ca4c9455 KH |
192 | /* PROP should be |
193 | Form-A: ((LENGTH . COMPONENTS) . MODIFICATION-FUNC) | |
194 | or | |
195 | Form-B: (COMPOSITION-ID . (LENGTH COMPONENTS-VEC . MODIFICATION-FUNC)) | |
196 | */ | |
197 | if (nchars == 0 || !CONSP (prop)) | |
198 | goto invalid_composition; | |
199 | ||
200 | id = XCAR (prop); | |
201 | if (INTEGERP (id)) | |
202 | { | |
203 | /* PROP should be Form-B. */ | |
204 | if (XINT (id) < 0 || XINT (id) >= n_compositions) | |
205 | goto invalid_composition; | |
206 | return XINT (id); | |
207 | } | |
208 | ||
209 | /* PROP should be Form-A. | |
210 | Thus, ID should be (LENGTH . COMPONENTS). */ | |
211 | if (!CONSP (id)) | |
212 | goto invalid_composition; | |
213 | length = XCAR (id); | |
214 | if (!INTEGERP (length) || XINT (length) != nchars) | |
215 | goto invalid_composition; | |
216 | ||
217 | components = XCDR (id); | |
218 | ||
219 | /* Check if the same composition has already been registered or not | |
220 | by consulting composition_hash_table. The key for this table is | |
221 | COMPONENTS (converted to a vector COMPONENTS-VEC) or, if it is | |
222 | nil, vector of characters in the composition range. */ | |
223 | if (INTEGERP (components)) | |
224 | key = Fmake_vector (make_number (1), components); | |
225 | else if (STRINGP (components) || CONSP (components)) | |
226 | key = Fvconcat (1, &components); | |
227 | else if (VECTORP (components)) | |
228 | key = components; | |
229 | else if (NILP (components)) | |
230 | { | |
3bfc46eb | 231 | key = make_uninit_vector (nchars); |
ca4c9455 KH |
232 | if (STRINGP (string)) |
233 | for (i = 0; i < nchars; i++) | |
234 | { | |
235 | FETCH_STRING_CHAR_ADVANCE (ch, string, charpos, bytepos); | |
28be1ada | 236 | ASET (key, i, make_number (ch)); |
ca4c9455 KH |
237 | } |
238 | else | |
239 | for (i = 0; i < nchars; i++) | |
240 | { | |
241 | FETCH_CHAR_ADVANCE (ch, charpos, bytepos); | |
28be1ada | 242 | ASET (key, i, make_number (ch)); |
ca4c9455 KH |
243 | } |
244 | } | |
245 | else | |
246 | goto invalid_composition; | |
247 | ||
248 | hash_index = hash_lookup (hash_table, key, &hash_code); | |
249 | if (hash_index >= 0) | |
250 | { | |
251 | /* We have already registered the same composition. Change PROP | |
252 | from Form-A above to Form-B while replacing COMPONENTS with | |
253 | COMPONENTS-VEC stored in the hash table. We can directly | |
254 | modify the cons cell of PROP because it is not shared. */ | |
255 | key = HASH_KEY (hash_table, hash_index); | |
256 | id = HASH_VALUE (hash_table, hash_index); | |
f3fbd155 KR |
257 | XSETCAR (prop, id); |
258 | XSETCDR (prop, Fcons (make_number (nchars), Fcons (key, XCDR (prop)))); | |
ca4c9455 KH |
259 | return XINT (id); |
260 | } | |
261 | ||
262 | /* This composition is a new one. We must register it. */ | |
177c0ea7 | 263 | |
ca4c9455 | 264 | /* Check if we have sufficient memory to store this information. */ |
0065d054 PE |
265 | if (composition_table_size <= n_compositions) |
266 | composition_table = xpalloc (composition_table, &composition_table_size, | |
267 | 1, -1, sizeof *composition_table); | |
ca4c9455 | 268 | |
91f2d272 | 269 | key_contents = XVECTOR (key)->contents; |
ca4c9455 KH |
270 | |
271 | /* Check if the contents of COMPONENTS are valid if COMPONENTS is a | |
272 | vector or a list. It should be a sequence of: | |
273 | char1 rule1 char2 rule2 char3 ... ruleN charN+1 */ | |
f30d8d94 | 274 | |
dd5e1ed4 | 275 | if (VECTORP (components) |
f30d8d94 KH |
276 | && ASIZE (components) >= 2 |
277 | && VECTORP (AREF (components, 0))) | |
278 | { | |
279 | /* COMPONENTS is a glyph-string. */ | |
d311d28c | 280 | ptrdiff_t len = ASIZE (key); |
f30d8d94 KH |
281 | |
282 | for (i = 1; i < len; i++) | |
283 | if (! VECTORP (AREF (key, i))) | |
284 | goto invalid_composition; | |
285 | } | |
dd5e1ed4 | 286 | else if (VECTORP (components) || CONSP (components)) |
ca4c9455 | 287 | { |
d311d28c | 288 | ptrdiff_t len = ASIZE (key); |
ca4c9455 KH |
289 | |
290 | /* The number of elements should be odd. */ | |
291 | if ((len % 2) == 0) | |
292 | goto invalid_composition; | |
293 | /* All elements should be integers (character or encoded | |
294 | composition rule). */ | |
295 | for (i = 0; i < len; i++) | |
296 | { | |
297 | if (!INTEGERP (key_contents[i])) | |
298 | goto invalid_composition; | |
299 | } | |
300 | } | |
301 | ||
302 | /* Change PROP from Form-A above to Form-B. We can directly modify | |
303 | the cons cell of PROP because it is not shared. */ | |
304 | XSETFASTINT (id, n_compositions); | |
f3fbd155 KR |
305 | XSETCAR (prop, id); |
306 | XSETCDR (prop, Fcons (make_number (nchars), Fcons (key, XCDR (prop)))); | |
ca4c9455 KH |
307 | |
308 | /* Register the composition in composition_hash_table. */ | |
309 | hash_index = hash_put (hash_table, key, id, hash_code); | |
310 | ||
d86d0d74 PE |
311 | method = (NILP (components) |
312 | ? COMPOSITION_RELATIVE | |
313 | : ((INTEGERP (components) || STRINGP (components)) | |
314 | ? COMPOSITION_WITH_ALTCHARS | |
315 | : COMPOSITION_WITH_RULE_ALTCHARS)); | |
316 | ||
317 | glyph_len = (method == COMPOSITION_WITH_RULE_ALTCHARS | |
318 | ? (ASIZE (key) + 1) / 2 | |
319 | : ASIZE (key)); | |
320 | ||
0065d054 | 321 | if (GLYPH_LEN_MAX < glyph_len) |
d86d0d74 PE |
322 | memory_full (SIZE_MAX); |
323 | ||
ca4c9455 | 324 | /* Register the composition in composition_table. */ |
38182d90 | 325 | cmp = xmalloc (sizeof *cmp); |
ca4c9455 | 326 | |
d86d0d74 | 327 | cmp->method = method; |
ca4c9455 | 328 | cmp->hash_index = hash_index; |
ca4c9455 | 329 | cmp->glyph_len = glyph_len; |
0065d054 | 330 | cmp->offsets = xnmalloc (glyph_len, 2 * sizeof *cmp->offsets); |
ca4c9455 KH |
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]); | |
bd01620e EZ |
341 | /* TAB in a composition means display glyphs with padding |
342 | space on the left or right. */ | |
8e86803c | 343 | this_width = (ch == '\t' ? 1 : CHAR_WIDTH (ch)); |
ca4c9455 KH |
344 | if (cmp->width < this_width) |
345 | cmp->width = this_width; | |
346 | } | |
347 | } | |
348 | else | |
349 | { | |
350 | /* Rule-base composition. */ | |
cb3c2e3e | 351 | double leftmost = 0.0, rightmost; |
ca4c9455 KH |
352 | |
353 | ch = XINT (key_contents[0]); | |
69df789a | 354 | rightmost = ch != '\t' ? CHAR_WIDTH (ch) : 1; |
ca4c9455 KH |
355 | |
356 | for (i = 1; i < glyph_len; i += 2) | |
357 | { | |
b13a45c6 | 358 | int rule, gref, nref; |
ca4c9455 | 359 | int this_width; |
cb3c2e3e | 360 | double this_left; |
ca4c9455 KH |
361 | |
362 | rule = XINT (key_contents[i]); | |
363 | ch = XINT (key_contents[i + 1]); | |
69df789a | 364 | this_width = ch != '\t' ? CHAR_WIDTH (ch) : 1; |
ca4c9455 KH |
365 | |
366 | /* A composition rule is specified by an integer value | |
367 | that encodes global and new reference points (GREF and | |
368 | NREF). GREF and NREF are specified by numbers as | |
369 | below: | |
370 | 0---1---2 -- ascent | |
371 | | | | |
372 | | | | |
373 | | | | |
374 | 9--10--11 -- center | |
375 | | | | |
376 | ---3---4---5--- baseline | |
377 | | | | |
378 | 6---7---8 -- descent | |
379 | */ | |
b13a45c6 | 380 | COMPOSITION_DECODE_REFS (rule, gref, nref); |
ca4c9455 KH |
381 | this_left = (leftmost |
382 | + (gref % 3) * (rightmost - leftmost) / 2.0 | |
383 | - (nref % 3) * this_width / 2.0); | |
384 | ||
385 | if (this_left < leftmost) | |
386 | leftmost = this_left; | |
387 | if (this_left + this_width > rightmost) | |
388 | rightmost = this_left + this_width; | |
389 | } | |
390 | ||
391 | cmp->width = rightmost - leftmost; | |
392 | if (cmp->width < (rightmost - leftmost)) | |
393 | /* To get a ceiling integer value. */ | |
394 | cmp->width++; | |
395 | } | |
396 | ||
397 | composition_table[n_compositions] = cmp; | |
398 | ||
399 | return n_compositions++; | |
400 | ||
401 | invalid_composition: | |
402 | /* Would it be better to remove this `composition' property? */ | |
403 | return -1; | |
404 | } | |
405 | ||
406 | \f | |
90b3fe91 KH |
407 | /* Find a static composition at or nearest to position POS of OBJECT |
408 | (buffer or string). | |
ca4c9455 KH |
409 | |
410 | OBJECT defaults to the current buffer. If there's a composition at | |
411 | POS, set *START and *END to the start and end of the sequence, | |
412 | *PROP to the `composition' property, and return 1. | |
413 | ||
414 | If there's no composition at POS and LIMIT is negative, return 0. | |
415 | ||
416 | Otherwise, search for a composition forward (LIMIT > POS) or | |
417 | backward (LIMIT < POS). In this case, LIMIT bounds the search. | |
418 | ||
419 | If a composition is found, set *START, *END, and *PROP as above, | |
420 | and return 1, else return 0. | |
421 | ||
422 | This doesn't check the validity of composition. */ | |
423 | ||
de1339b0 | 424 | bool |
d311d28c PE |
425 | find_composition (ptrdiff_t pos, ptrdiff_t limit, |
426 | ptrdiff_t *start, ptrdiff_t *end, | |
579c18d0 | 427 | Lisp_Object *prop, Lisp_Object object) |
ca4c9455 KH |
428 | { |
429 | Lisp_Object val; | |
430 | ||
431 | if (get_property_and_range (pos, Qcomposition, prop, start, end, object)) | |
432 | return 1; | |
433 | ||
434 | if (limit < 0 || limit == pos) | |
435 | return 0; | |
436 | ||
437 | if (limit > pos) /* search forward */ | |
d279f620 KH |
438 | { |
439 | val = Fnext_single_property_change (make_number (pos), Qcomposition, | |
440 | object, make_number (limit)); | |
441 | pos = XINT (val); | |
442 | if (pos == limit) | |
443 | return 0; | |
444 | } | |
ca4c9455 | 445 | else /* search backward */ |
d279f620 KH |
446 | { |
447 | if (get_property_and_range (pos - 1, Qcomposition, prop, start, end, | |
448 | object)) | |
449 | return 1; | |
450 | val = Fprevious_single_property_change (make_number (pos), Qcomposition, | |
451 | object, make_number (limit)); | |
452 | pos = XINT (val); | |
453 | if (pos == limit) | |
454 | return 0; | |
455 | pos--; | |
456 | } | |
ca4c9455 KH |
457 | get_property_and_range (pos, Qcomposition, prop, start, end, object); |
458 | return 1; | |
459 | } | |
460 | ||
461 | /* Run a proper function to adjust the composition sitting between | |
462 | FROM and TO with property PROP. */ | |
463 | ||
464 | static void | |
d311d28c | 465 | run_composition_function (ptrdiff_t from, ptrdiff_t to, Lisp_Object prop) |
ca4c9455 | 466 | { |
7d019510 | 467 | Lisp_Object func; |
d311d28c | 468 | ptrdiff_t start, end; |
ca4c9455 KH |
469 | |
470 | func = COMPOSITION_MODIFICATION_FUNC (prop); | |
471 | /* If an invalid composition precedes or follows, try to make them | |
472 | valid too. */ | |
473 | if (from > BEGV | |
474 | && find_composition (from - 1, -1, &start, &end, &prop, Qnil) | |
75c59fb3 | 475 | && !composition_valid_p (start, end, prop)) |
ca4c9455 KH |
476 | from = start; |
477 | if (to < ZV | |
478 | && find_composition (to, -1, &start, &end, &prop, Qnil) | |
75c59fb3 | 479 | && !composition_valid_p (start, end, prop)) |
ca4c9455 | 480 | to = end; |
775b3d2d | 481 | if (!NILP (Ffboundp (func))) |
ca4c9455 | 482 | call2 (func, make_number (from), make_number (to)); |
ca4c9455 KH |
483 | } |
484 | ||
485 | /* Make invalid compositions adjacent to or inside FROM and TO valid. | |
486 | CHECK_MASK is bitwise `or' of mask bits defined by macros | |
487 | CHECK_XXX (see the comment in composite.h). | |
488 | ||
b418f8a6 | 489 | It also resets the text-property `auto-composed' to a proper region |
f96ba4c1 KH |
490 | so that automatic character composition works correctly later while |
491 | displaying the region. | |
8f924df7 | 492 | |
ca4c9455 KH |
493 | This function is called when a buffer text is changed. If the |
494 | change is deletion, FROM == TO. Otherwise, FROM < TO. */ | |
495 | ||
496 | void | |
d311d28c | 497 | update_compositions (ptrdiff_t from, ptrdiff_t to, int check_mask) |
ca4c9455 | 498 | { |
7d019510 | 499 | Lisp_Object prop; |
d311d28c | 500 | ptrdiff_t start, end; |
f96ba4c1 KH |
501 | /* The beginning and end of the region to set the property |
502 | `auto-composed' to nil. */ | |
d311d28c | 503 | ptrdiff_t min_pos = from, max_pos = to; |
ca4c9455 | 504 | |
6c1aa7f1 GM |
505 | if (inhibit_modification_hooks) |
506 | return; | |
177c0ea7 | 507 | |
d3f40cbd KH |
508 | /* If FROM and TO are not in a valid range, do nothing. */ |
509 | if (! (BEGV <= from && from <= to && to <= ZV)) | |
510 | return; | |
511 | ||
ca4c9455 KH |
512 | if (check_mask & CHECK_HEAD) |
513 | { | |
514 | /* FROM should be at composition boundary. But, insertion or | |
515 | deletion will make two compositions adjacent and | |
516 | indistinguishable when they have same (eq) property. To | |
517 | avoid it, in such a case, we change the property of the | |
518 | latter to the copy of it. */ | |
519 | if (from > BEGV | |
553d3164 | 520 | && find_composition (from - 1, -1, &start, &end, &prop, Qnil) |
75c59fb3 | 521 | && composition_valid_p (start, end, prop)) |
ca4c9455 | 522 | { |
f96ba4c1 KH |
523 | min_pos = start; |
524 | if (end > to) | |
525 | max_pos = end; | |
ca4c9455 KH |
526 | if (from < end) |
527 | Fput_text_property (make_number (from), make_number (end), | |
528 | Qcomposition, | |
529 | Fcons (XCAR (prop), XCDR (prop)), Qnil); | |
530 | run_composition_function (start, end, prop); | |
531 | from = end; | |
532 | } | |
dd33cc56 | 533 | else if (from < ZV |
553d3164 | 534 | && find_composition (from, -1, &start, &from, &prop, Qnil) |
75c59fb3 | 535 | && composition_valid_p (start, from, prop)) |
f96ba4c1 KH |
536 | { |
537 | if (from > to) | |
538 | max_pos = from; | |
539 | run_composition_function (start, from, prop); | |
540 | } | |
ca4c9455 KH |
541 | } |
542 | ||
543 | if (check_mask & CHECK_INSIDE) | |
544 | { | |
545 | /* In this case, we are sure that (check & CHECK_TAIL) is also | |
546 | nonzero. Thus, here we should check only compositions before | |
547 | (to - 1). */ | |
548 | while (from < to - 1 | |
549 | && find_composition (from, to, &start, &from, &prop, Qnil) | |
75c59fb3 | 550 | && composition_valid_p (start, from, prop) |
ca4c9455 KH |
551 | && from < to - 1) |
552 | run_composition_function (start, from, prop); | |
553 | } | |
554 | ||
555 | if (check_mask & CHECK_TAIL) | |
556 | { | |
557 | if (from < to | |
553d3164 | 558 | && find_composition (to - 1, -1, &start, &end, &prop, Qnil) |
75c59fb3 | 559 | && composition_valid_p (start, end, prop)) |
ca4c9455 KH |
560 | { |
561 | /* TO should be also at composition boundary. But, | |
562 | insertion or deletion will make two compositions adjacent | |
563 | and indistinguishable when they have same (eq) property. | |
564 | To avoid it, in such a case, we change the property of | |
565 | the former to the copy of it. */ | |
566 | if (to < end) | |
f96ba4c1 KH |
567 | { |
568 | Fput_text_property (make_number (start), make_number (to), | |
569 | Qcomposition, | |
570 | Fcons (XCAR (prop), XCDR (prop)), Qnil); | |
571 | max_pos = end; | |
572 | } | |
ca4c9455 KH |
573 | run_composition_function (start, end, prop); |
574 | } | |
575 | else if (to < ZV | |
553d3164 | 576 | && find_composition (to, -1, &start, &end, &prop, Qnil) |
75c59fb3 | 577 | && composition_valid_p (start, end, prop)) |
f96ba4c1 KH |
578 | { |
579 | run_composition_function (start, end, prop); | |
580 | max_pos = end; | |
581 | } | |
ca4c9455 | 582 | } |
f96ba4c1 | 583 | if (min_pos < max_pos) |
9d440521 | 584 | { |
d311d28c | 585 | ptrdiff_t count = SPECPDL_INDEX (); |
9d440521 KH |
586 | |
587 | specbind (Qinhibit_read_only, Qt); | |
588 | specbind (Qinhibit_modification_hooks, Qt); | |
589 | specbind (Qinhibit_point_motion_hooks, Qt); | |
590 | Fremove_list_of_text_properties (make_number (min_pos), | |
591 | make_number (max_pos), | |
6c6f1994 | 592 | list1 (Qauto_composed), Qnil); |
9d440521 KH |
593 | unbind_to (count, Qnil); |
594 | } | |
ca4c9455 KH |
595 | } |
596 | ||
c1361885 KH |
597 | |
598 | /* Modify composition property values in LIST destructively. LIST is | |
599 | a list as returned from text_property_list. Change values to the | |
600 | top-level copies of them so that none of them are `eq'. */ | |
601 | ||
602 | void | |
971de7fb | 603 | make_composition_value_copy (Lisp_Object list) |
c1361885 KH |
604 | { |
605 | Lisp_Object plist, val; | |
606 | ||
607 | for (; CONSP (list); list = XCDR (list)) | |
608 | { | |
609 | plist = XCAR (XCDR (XCDR (XCAR (list)))); | |
610 | while (CONSP (plist) && CONSP (XCDR (plist))) | |
611 | { | |
612 | if (EQ (XCAR (plist), Qcomposition) | |
613 | && (val = XCAR (XCDR (plist)), CONSP (val))) | |
f3fbd155 | 614 | XSETCAR (XCDR (plist), Fcons (XCAR (val), XCDR (val))); |
c1361885 KH |
615 | plist = XCDR (XCDR (plist)); |
616 | } | |
617 | } | |
618 | } | |
619 | ||
620 | ||
ca4c9455 KH |
621 | /* Make text in the region between START and END a composition that |
622 | has COMPONENTS and MODIFICATION-FUNC. | |
623 | ||
624 | If STRING is non-nil, then operate on characters contained between | |
625 | indices START and END in STRING. */ | |
626 | ||
627 | void | |
d311d28c | 628 | compose_text (ptrdiff_t start, ptrdiff_t end, Lisp_Object components, |
579c18d0 | 629 | Lisp_Object modification_func, Lisp_Object string) |
ca4c9455 KH |
630 | { |
631 | Lisp_Object prop; | |
632 | ||
633 | prop = Fcons (Fcons (make_number (end - start), components), | |
634 | modification_func); | |
635 | Fput_text_property (make_number (start), make_number (end), | |
636 | Qcomposition, prop, string); | |
637 | } | |
58753d74 | 638 | |
5a655b9f | 639 | /* Lisp glyph-string handlers. */ |
58753d74 KH |
640 | |
641 | /* Hash table for automatic composition. The key is a header of a | |
642 | lgstring (Lispy glyph-string), and the value is a body of a | |
643 | lgstring. */ | |
644 | ||
645 | static Lisp_Object gstring_hash_table; | |
646 | ||
f57e2426 | 647 | static Lisp_Object gstring_lookup_cache (Lisp_Object); |
58753d74 KH |
648 | |
649 | static Lisp_Object | |
971de7fb | 650 | gstring_lookup_cache (Lisp_Object header) |
58753d74 KH |
651 | { |
652 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
d3411f89 | 653 | ptrdiff_t i = hash_lookup (h, header, NULL); |
58753d74 KH |
654 | |
655 | return (i >= 0 ? HASH_VALUE (h, i) : Qnil); | |
656 | } | |
657 | ||
658 | Lisp_Object | |
d311d28c | 659 | composition_gstring_put_cache (Lisp_Object gstring, ptrdiff_t len) |
58753d74 KH |
660 | { |
661 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
0de4bb68 | 662 | EMACS_UINT hash; |
58753d74 | 663 | Lisp_Object header, copy; |
d311d28c | 664 | ptrdiff_t i; |
58753d74 KH |
665 | |
666 | header = LGSTRING_HEADER (gstring); | |
b7432bb2 | 667 | hash = h->test.hashfn (&h->test, header); |
58753d74 KH |
668 | if (len < 0) |
669 | { | |
d311d28c | 670 | ptrdiff_t j, glyph_len = LGSTRING_GLYPH_LEN (gstring); |
27ccc379 PE |
671 | for (j = 0; j < glyph_len; j++) |
672 | if (NILP (LGSTRING_GLYPH (gstring, j))) | |
58753d74 | 673 | break; |
27ccc379 | 674 | len = j; |
58753d74 | 675 | } |
087e2ea9 | 676 | |
58753d74 KH |
677 | copy = Fmake_vector (make_number (len + 2), Qnil); |
678 | LGSTRING_SET_HEADER (copy, Fcopy_sequence (header)); | |
679 | for (i = 0; i < len; i++) | |
680 | LGSTRING_SET_GLYPH (copy, i, Fcopy_sequence (LGSTRING_GLYPH (gstring, i))); | |
681 | i = hash_put (h, LGSTRING_HEADER (copy), copy, hash); | |
682 | LGSTRING_SET_ID (copy, make_number (i)); | |
683 | return copy; | |
684 | } | |
685 | ||
686 | Lisp_Object | |
ebfa62c0 | 687 | composition_gstring_from_id (ptrdiff_t id) |
58753d74 KH |
688 | { |
689 | struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table); | |
690 | ||
691 | return HASH_VALUE (h, id); | |
692 | } | |
693 | ||
de1339b0 | 694 | bool |
971de7fb | 695 | composition_gstring_p (Lisp_Object gstring) |
58753d74 KH |
696 | { |
697 | Lisp_Object header; | |
d311d28c | 698 | ptrdiff_t i; |
58753d74 KH |
699 | |
700 | if (! VECTORP (gstring) || ASIZE (gstring) < 2) | |
701 | return 0; | |
702 | header = LGSTRING_HEADER (gstring); | |
703 | if (! VECTORP (header) || ASIZE (header) < 2) | |
704 | return 0; | |
705 | if (! NILP (LGSTRING_FONT (gstring)) | |
f5199465 KH |
706 | && (! FONT_OBJECT_P (LGSTRING_FONT (gstring)) |
707 | && ! CODING_SYSTEM_P (LGSTRING_FONT (gstring)))) | |
58753d74 KH |
708 | return 0; |
709 | for (i = 1; i < ASIZE (LGSTRING_HEADER (gstring)); i++) | |
710 | if (! NATNUMP (AREF (LGSTRING_HEADER (gstring), i))) | |
711 | return 0; | |
712 | if (! NILP (LGSTRING_ID (gstring)) && ! NATNUMP (LGSTRING_ID (gstring))) | |
713 | return 0; | |
714 | for (i = 0; i < LGSTRING_GLYPH_LEN (gstring); i++) | |
715 | { | |
716 | Lisp_Object glyph = LGSTRING_GLYPH (gstring, i); | |
717 | if (NILP (glyph)) | |
718 | break; | |
719 | if (! VECTORP (glyph) || ASIZE (glyph) != LGLYPH_SIZE) | |
720 | return 0; | |
721 | } | |
722 | return 1; | |
723 | } | |
724 | ||
725 | int | |
d311d28c | 726 | composition_gstring_width (Lisp_Object gstring, ptrdiff_t from, ptrdiff_t to, |
579c18d0 | 727 | struct font_metrics *metrics) |
58753d74 KH |
728 | { |
729 | Lisp_Object *glyph; | |
730 | int width = 0; | |
731 | ||
732 | if (metrics) | |
733 | { | |
734 | Lisp_Object font_object = LGSTRING_FONT (gstring); | |
58753d74 | 735 | |
f5199465 KH |
736 | if (FONT_OBJECT_P (font_object)) |
737 | { | |
738 | struct font *font = XFONT_OBJECT (font_object); | |
739 | ||
740 | metrics->ascent = font->ascent; | |
741 | metrics->descent = font->descent; | |
742 | } | |
743 | else | |
744 | { | |
745 | metrics->ascent = 1; | |
746 | metrics->descent = 0; | |
747 | } | |
58753d74 KH |
748 | metrics->width = metrics->lbearing = metrics->rbearing = 0; |
749 | } | |
4939150c | 750 | for (glyph = lgstring_glyph_addr (gstring, from); from < to; from++, glyph++) |
58753d74 KH |
751 | { |
752 | int x; | |
753 | ||
754 | if (NILP (LGLYPH_ADJUSTMENT (*glyph))) | |
755 | width += LGLYPH_WIDTH (*glyph); | |
756 | else | |
757 | width += LGLYPH_WADJUST (*glyph); | |
758 | if (metrics) | |
759 | { | |
760 | x = metrics->width + LGLYPH_LBEARING (*glyph) + LGLYPH_XOFF (*glyph); | |
761 | if (metrics->lbearing > x) | |
762 | metrics->lbearing = x; | |
763 | x = metrics->width + LGLYPH_RBEARING (*glyph) + LGLYPH_XOFF (*glyph); | |
764 | if (metrics->rbearing < x) | |
765 | metrics->rbearing = x; | |
766 | metrics->width = width; | |
767 | x = LGLYPH_ASCENT (*glyph) - LGLYPH_YOFF (*glyph); | |
768 | if (metrics->ascent < x) | |
769 | metrics->ascent = x; | |
895416e3 | 770 | x = LGLYPH_DESCENT (*glyph) + LGLYPH_YOFF (*glyph); |
58753d74 KH |
771 | if (metrics->descent < x) |
772 | metrics->descent = x; | |
773 | } | |
774 | } | |
775 | return width; | |
776 | } | |
777 | ||
778 | ||
779 | static Lisp_Object gstring_work; | |
780 | static Lisp_Object gstring_work_headers; | |
781 | ||
782 | static Lisp_Object | |
28c16c40 DA |
783 | fill_gstring_header (Lisp_Object header, ptrdiff_t from, ptrdiff_t from_byte, |
784 | ptrdiff_t to, Lisp_Object font_object, Lisp_Object string) | |
58753d74 | 785 | { |
28c16c40 | 786 | ptrdiff_t len = to - from, i; |
58753d74 | 787 | |
58753d74 KH |
788 | if (len == 0) |
789 | error ("Attempt to shape zero-length text"); | |
790 | if (VECTORP (header)) | |
791 | { | |
792 | if (ASIZE (header) != len + 1) | |
793 | args_out_of_range (header, make_number (len + 1)); | |
794 | } | |
795 | else | |
796 | { | |
797 | if (len <= 8) | |
798 | header = AREF (gstring_work_headers, len - 1); | |
799 | else | |
3bfc46eb | 800 | header = make_uninit_vector (len + 1); |
58753d74 KH |
801 | } |
802 | ||
803 | ASET (header, 0, font_object); | |
804 | for (i = 0; i < len; i++) | |
805 | { | |
806 | int c; | |
807 | ||
808 | if (NILP (string)) | |
809 | FETCH_CHAR_ADVANCE_NO_CHECK (c, from, from_byte); | |
810 | else | |
811 | FETCH_STRING_CHAR_ADVANCE_NO_CHECK (c, string, from, from_byte); | |
812 | ASET (header, i + 1, make_number (c)); | |
813 | } | |
814 | return header; | |
815 | } | |
816 | ||
58753d74 | 817 | static void |
971de7fb | 818 | fill_gstring_body (Lisp_Object gstring) |
58753d74 KH |
819 | { |
820 | Lisp_Object font_object = LGSTRING_FONT (gstring); | |
821 | Lisp_Object header = AREF (gstring, 0); | |
d311d28c PE |
822 | ptrdiff_t len = LGSTRING_CHAR_LEN (gstring); |
823 | ptrdiff_t i; | |
58753d74 KH |
824 | |
825 | for (i = 0; i < len; i++) | |
826 | { | |
827 | Lisp_Object g = LGSTRING_GLYPH (gstring, i); | |
f8c86b69 | 828 | int c = XFASTINT (AREF (header, i + 1)); |
58753d74 KH |
829 | |
830 | if (NILP (g)) | |
831 | { | |
832 | g = LGLYPH_NEW (); | |
833 | LGSTRING_SET_GLYPH (gstring, i, g); | |
834 | } | |
835 | LGLYPH_SET_FROM (g, i); | |
836 | LGLYPH_SET_TO (g, i); | |
837 | LGLYPH_SET_CHAR (g, c); | |
f5199465 | 838 | if (FONT_OBJECT_P (font_object)) |
58753d74 KH |
839 | { |
840 | font_fill_lglyph_metrics (g, font_object); | |
841 | } | |
842 | else | |
843 | { | |
844 | int width = XFASTINT (CHAR_TABLE_REF (Vchar_width_table, c)); | |
845 | ||
846 | LGLYPH_SET_CODE (g, c); | |
847 | LGLYPH_SET_LBEARING (g, 0); | |
848 | LGLYPH_SET_RBEARING (g, width); | |
849 | LGLYPH_SET_WIDTH (g, width); | |
850 | LGLYPH_SET_ASCENT (g, 1); | |
851 | LGLYPH_SET_DESCENT (g, 0); | |
852 | } | |
853 | LGLYPH_SET_ADJUSTMENT (g, Qnil); | |
854 | } | |
855 | if (i < LGSTRING_GLYPH_LEN (gstring)) | |
856 | LGSTRING_SET_GLYPH (gstring, i, Qnil); | |
857 | } | |
858 | ||
58753d74 | 859 | |
10f72a37 KH |
860 | /* Try to compose the characters at CHARPOS according to composition |
861 | rule RULE ([PATTERN PREV-CHARS FUNC]). LIMIT limits the characters | |
862 | to compose. STRING, if not nil, is a target string. WIN is a | |
863 | window where the characters are being displayed. If characters are | |
864 | successfully composed, return the composition as a glyph-string | |
865 | object. Otherwise return nil. */ | |
58753d74 KH |
866 | |
867 | static Lisp_Object | |
5a655b9f DA |
868 | autocmp_chars (Lisp_Object rule, ptrdiff_t charpos, ptrdiff_t bytepos, |
869 | ptrdiff_t limit, struct window *win, struct face *face, | |
870 | Lisp_Object string) | |
58753d74 | 871 | { |
d311d28c | 872 | ptrdiff_t count = SPECPDL_INDEX (); |
a10c8269 | 873 | struct frame *f = XFRAME (win->frame); |
58753d74 | 874 | Lisp_Object pos = make_number (charpos); |
d311d28c PE |
875 | ptrdiff_t to; |
876 | ptrdiff_t pt = PT, pt_byte = PT_BYTE; | |
10f72a37 | 877 | Lisp_Object re, font_object, lgstring; |
d311d28c | 878 | ptrdiff_t len; |
087e2ea9 | 879 | |
58753d74 | 880 | record_unwind_save_match_data (); |
10f72a37 KH |
881 | re = AREF (rule, 0); |
882 | if (NILP (re)) | |
883 | len = 1; | |
884 | else if (! STRINGP (re)) | |
885 | return unbind_to (count, Qnil); | |
886 | else if ((len = fast_looking_at (re, charpos, bytepos, limit, -1, string)) | |
887 | > 0) | |
58753d74 | 888 | { |
10f72a37 KH |
889 | if (NILP (string)) |
890 | len = BYTE_TO_CHAR (bytepos + len) - charpos; | |
891 | else | |
892 | len = string_byte_to_char (string, bytepos + len) - charpos; | |
893 | } | |
894 | if (len <= 0) | |
895 | return unbind_to (count, Qnil); | |
896 | to = limit = charpos + len; | |
58753d74 | 897 | #ifdef HAVE_WINDOW_SYSTEM |
10f72a37 KH |
898 | if (FRAME_WINDOW_P (f)) |
899 | { | |
5a655b9f | 900 | font_object = font_range (charpos, bytepos, &to, win, face, string); |
10f72a37 KH |
901 | if (! FONT_OBJECT_P (font_object) |
902 | || (! NILP (re) | |
903 | && to < limit | |
904 | && (fast_looking_at (re, charpos, bytepos, to, -1, string) <= 0))) | |
905 | return unbind_to (count, Qnil); | |
906 | } | |
907 | else | |
58753d74 | 908 | #endif /* not HAVE_WINDOW_SYSTEM */ |
d3d50620 | 909 | font_object = win->frame; |
10f72a37 KH |
910 | lgstring = Fcomposition_get_gstring (pos, make_number (to), font_object, |
911 | string); | |
912 | if (NILP (LGSTRING_ID (lgstring))) | |
913 | { | |
10f72a37 KH |
914 | /* Save point as marker before calling out to lisp. */ |
915 | if (NILP (string)) | |
657924ff DA |
916 | record_unwind_protect (restore_point_unwind, |
917 | build_marker (current_buffer, pt, pt_byte)); | |
6cd7a139 DA |
918 | lgstring = safe_call (6, Vauto_composition_function, AREF (rule, 2), |
919 | pos, make_number (to), font_object, string); | |
58753d74 | 920 | } |
10f72a37 | 921 | return unbind_to (count, lgstring); |
58753d74 KH |
922 | } |
923 | ||
f6aa6ec6 KH |
924 | /* 1 iff the character C is composable. Characters of general |
925 | category Z? or C? are not composable except for ZWNJ and ZWJ. */ | |
926 | ||
9dc774d4 DA |
927 | static bool |
928 | char_composable_p (int c) | |
929 | { | |
930 | Lisp_Object val; | |
931 | return (c > ' ' | |
932 | && (c == 0x200C || c == 0x200D | |
933 | || (val = CHAR_TABLE_REF (Vunicode_category_table, c), | |
934 | (INTEGERP (val) && (XINT (val) <= UNICODE_CATEGORY_So))))); | |
935 | } | |
58753d74 KH |
936 | |
937 | /* Update cmp_it->stop_pos to the next position after CHARPOS (and | |
938 | BYTEPOS) where character composition may happen. If BYTEPOS is | |
82ebc97b KH |
939 | negative, compute it. ENDPOS is a limit of searching. If it is |
940 | less than CHARPOS, search backward to ENDPOS+1 assuming that | |
941 | set_iterator_to_next works in reverse order. In this case, if a | |
942 | composition closest to CHARPOS is found, set cmp_it->stop_pos to | |
943 | the last character of the composition. | |
944 | ||
945 | If no composition is found, set cmp_it->ch to -2. If a static | |
946 | composition is found, set cmp_it->ch to -1. Otherwise, set | |
947 | cmp_it->ch to the character that triggers the automatic | |
948 | composition. */ | |
58753d74 KH |
949 | |
950 | void | |
d311d28c | 951 | composition_compute_stop_pos (struct composition_it *cmp_it, ptrdiff_t charpos, ptrdiff_t bytepos, ptrdiff_t endpos, Lisp_Object string) |
58753d74 | 952 | { |
d311d28c | 953 | ptrdiff_t start, end; |
f8c86b69 | 954 | int c; |
58753d74 | 955 | Lisp_Object prop, val; |
3ffdafce KH |
956 | /* This is from forward_to_next_line_start in xdisp.c. */ |
957 | const int MAX_NEWLINE_DISTANCE = 500; | |
58753d74 | 958 | |
82ebc97b KH |
959 | if (charpos < endpos) |
960 | { | |
961 | if (endpos > charpos + MAX_NEWLINE_DISTANCE) | |
962 | endpos = charpos + MAX_NEWLINE_DISTANCE; | |
963 | } | |
964 | else if (endpos < charpos) | |
965 | { | |
966 | /* We search backward for a position to check composition. */ | |
967 | if (endpos < 0) | |
968 | { | |
969 | /* But we don't know where to stop the searching. */ | |
970 | endpos = NILP (string) ? BEGV - 1 : -1; | |
971 | /* Usually we don't reach ENDPOS because we stop searching | |
972 | at an uncomposable character (NL, LRE, etc). */ | |
973 | } | |
974 | } | |
053ca52b | 975 | cmp_it->id = -1; |
44566dc7 | 976 | cmp_it->ch = -2; |
82ebc97b KH |
977 | cmp_it->reversed_p = 0; |
978 | cmp_it->stop_pos = endpos; | |
979 | if (charpos == endpos) | |
980 | return; | |
981 | /* FIXME: Bidi is not yet handled well in static composition. */ | |
982 | if (charpos < endpos | |
983 | && find_composition (charpos, endpos, &start, &end, &prop, string) | |
15fa4783 | 984 | && start >= charpos |
75c59fb3 | 985 | && composition_valid_p (start, end, prop)) |
58753d74 KH |
986 | { |
987 | cmp_it->stop_pos = endpos = start; | |
988 | cmp_it->ch = -1; | |
989 | } | |
4b4deea2 | 990 | if (NILP (BVAR (current_buffer, enable_multibyte_characters)) |
d9a7c140 | 991 | || NILP (Vauto_composition_mode)) |
58753d74 KH |
992 | return; |
993 | if (bytepos < 0) | |
994 | { | |
82ebc97b | 995 | if (NILP (string)) |
58753d74 | 996 | bytepos = CHAR_TO_BYTE (charpos); |
82ebc97b KH |
997 | else |
998 | bytepos = string_char_to_byte (string, charpos); | |
58753d74 KH |
999 | } |
1000 | ||
1001 | start = charpos; | |
82ebc97b | 1002 | if (charpos < endpos) |
58753d74 | 1003 | { |
82ebc97b KH |
1004 | /* Forward search. */ |
1005 | while (charpos < endpos) | |
ea8ba975 | 1006 | { |
82ebc97b KH |
1007 | if (STRINGP (string)) |
1008 | FETCH_STRING_CHAR_ADVANCE (c, string, charpos, bytepos); | |
1009 | else | |
1010 | FETCH_CHAR_ADVANCE (c, charpos, bytepos); | |
1011 | if (c == '\n') | |
1012 | { | |
1013 | cmp_it->ch = -2; | |
1014 | break; | |
1015 | } | |
1016 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1017 | if (! NILP (val)) | |
1018 | { | |
1019 | Lisp_Object elt; | |
10f72a37 | 1020 | int ridx; |
82ebc97b | 1021 | |
10f72a37 | 1022 | for (ridx = 0; CONSP (val); val = XCDR (val), ridx++) |
82ebc97b KH |
1023 | { |
1024 | elt = XCAR (val); | |
1025 | if (VECTORP (elt) && ASIZE (elt) == 3 | |
1026 | && NATNUMP (AREF (elt, 1)) | |
1027 | && charpos - 1 - XFASTINT (AREF (elt, 1)) >= start) | |
1028 | break; | |
1029 | } | |
1030 | if (CONSP (val)) | |
1031 | { | |
10f72a37 | 1032 | cmp_it->rule_idx = ridx; |
82ebc97b KH |
1033 | cmp_it->lookback = XFASTINT (AREF (elt, 1)); |
1034 | cmp_it->stop_pos = charpos - 1 - cmp_it->lookback; | |
1035 | cmp_it->ch = c; | |
1036 | return; | |
1037 | } | |
1038 | } | |
ea8ba975 | 1039 | } |
ff94e32c KH |
1040 | if (charpos == endpos) |
1041 | { | |
1042 | /* We couldn't find a composition point before ENDPOS. But, | |
1043 | some character after ENDPOS may be composed with | |
1044 | characters before ENDPOS. So, we should stop at the safe | |
1045 | point. */ | |
1046 | charpos = endpos - MAX_AUTO_COMPOSITION_LOOKBACK; | |
1047 | if (charpos < start) | |
1048 | charpos = start; | |
1049 | } | |
82ebc97b | 1050 | } |
b7050583 | 1051 | else if (charpos > endpos) |
82ebc97b KH |
1052 | { |
1053 | /* Search backward for a pattern that may be composed and the | |
1054 | position of (possibly) the last character of the match is | |
1055 | closest to (but not after) START. The reason for the last | |
d07f018c EZ |
1056 | character is that set_iterator_to_next works in reverse order, |
1057 | and thus we must stop at the last character for composition | |
82ebc97b KH |
1058 | check. */ |
1059 | unsigned char *p; | |
1060 | int len; | |
d07f018c EZ |
1061 | /* Limit byte position used in fast_looking_at. This is the |
1062 | byte position of the character after START. */ | |
d311d28c | 1063 | ptrdiff_t limit; |
82ebc97b KH |
1064 | |
1065 | if (NILP (string)) | |
1066 | p = BYTE_POS_ADDR (bytepos); | |
1067 | else | |
1068 | p = SDATA (string) + bytepos; | |
1069 | c = STRING_CHAR_AND_LENGTH (p, len); | |
1070 | limit = bytepos + len; | |
9dc774d4 | 1071 | while (char_composable_p (c)) |
58753d74 | 1072 | { |
10f72a37 KH |
1073 | val = CHAR_TABLE_REF (Vcomposition_function_table, c); |
1074 | if (! NILP (val)) | |
82ebc97b | 1075 | { |
10f72a37 | 1076 | Lisp_Object elt; |
d311d28c | 1077 | int ridx, blen; |
58753d74 | 1078 | |
10f72a37 | 1079 | for (ridx = 0; CONSP (val); val = XCDR (val), ridx++) |
82ebc97b | 1080 | { |
10f72a37 KH |
1081 | elt = XCAR (val); |
1082 | if (VECTORP (elt) && ASIZE (elt) == 3 | |
1083 | && NATNUMP (AREF (elt, 1)) | |
d311d28c | 1084 | && charpos - XFASTINT (AREF (elt, 1)) > endpos) |
82ebc97b | 1085 | { |
d311d28c PE |
1086 | ptrdiff_t back = XFASTINT (AREF (elt, 1)); |
1087 | ptrdiff_t cpos = charpos - back, bpos; | |
10f72a37 KH |
1088 | |
1089 | if (back == 0) | |
1090 | bpos = bytepos; | |
82ebc97b | 1091 | else |
10f72a37 KH |
1092 | bpos = (NILP (string) ? CHAR_TO_BYTE (cpos) |
1093 | : string_char_to_byte (string, cpos)); | |
1094 | if (STRINGP (AREF (elt, 0))) | |
8f5201ae PE |
1095 | blen = fast_looking_at (AREF (elt, 0), cpos, bpos, |
1096 | start + 1, limit, string); | |
10f72a37 | 1097 | else |
8f5201ae PE |
1098 | blen = 1; |
1099 | if (blen > 0) | |
82ebc97b | 1100 | { |
10f72a37 | 1101 | /* Make CPOS point to the last character of |
8f5201ae PE |
1102 | match. Note that BLEN is byte-length. */ |
1103 | if (blen > 1) | |
10f72a37 | 1104 | { |
8f5201ae | 1105 | bpos += blen; |
10f72a37 KH |
1106 | if (NILP (string)) |
1107 | cpos = BYTE_TO_CHAR (bpos) - 1; | |
1108 | else | |
1109 | cpos = string_byte_to_char (string, bpos) - 1; | |
1110 | } | |
1111 | back = cpos - (charpos - back); | |
1112 | if (cmp_it->stop_pos < cpos | |
1113 | || (cmp_it->stop_pos == cpos | |
1114 | && cmp_it->lookback < back)) | |
1115 | { | |
1116 | cmp_it->rule_idx = ridx; | |
1117 | cmp_it->stop_pos = cpos; | |
1118 | cmp_it->ch = c; | |
1119 | cmp_it->lookback = back; | |
1120 | cmp_it->nchars = back + 1; | |
1121 | } | |
82ebc97b KH |
1122 | } |
1123 | } | |
1124 | } | |
1125 | } | |
1126 | if (charpos - 1 == endpos) | |
1127 | break; | |
1128 | if (STRINGP (string)) | |
58753d74 | 1129 | { |
82ebc97b KH |
1130 | p--, bytepos--; |
1131 | while (! CHAR_HEAD_P (*p)) | |
1132 | p--, bytepos--; | |
1133 | charpos--; | |
1134 | } | |
1135 | else | |
1136 | { | |
1137 | DEC_BOTH (charpos, bytepos); | |
1138 | p = BYTE_POS_ADDR (bytepos); | |
58753d74 | 1139 | } |
82ebc97b KH |
1140 | c = STRING_CHAR (p); |
1141 | } | |
1142 | if (cmp_it->ch >= 0) | |
1143 | /* We found a position to check. */ | |
1144 | return; | |
1145 | /* Skip all uncomposable characters. */ | |
1146 | if (NILP (string)) | |
1147 | { | |
9dc774d4 | 1148 | while (charpos - 1 > endpos && ! char_composable_p (c)) |
58753d74 | 1149 | { |
82ebc97b KH |
1150 | DEC_BOTH (charpos, bytepos); |
1151 | c = FETCH_MULTIBYTE_CHAR (bytepos); | |
1152 | } | |
1153 | } | |
1154 | else | |
1155 | { | |
9dc774d4 | 1156 | while (charpos - 1 > endpos && ! char_composable_p (c)) |
82ebc97b KH |
1157 | { |
1158 | p--; | |
1159 | while (! CHAR_HEAD_P (*p)) | |
1160 | p--; | |
1161 | charpos--; | |
1162 | c = STRING_CHAR (p); | |
58753d74 KH |
1163 | } |
1164 | } | |
1165 | } | |
44566dc7 | 1166 | cmp_it->stop_pos = charpos; |
58753d74 KH |
1167 | } |
1168 | ||
1169 | /* Check if the character at CHARPOS (and BYTEPOS) is composed | |
22e33406 | 1170 | (possibly with the following characters) on window W. ENDPOS limits |
2595af33 | 1171 | characters to be composed. FACE, if non-NULL, is a base face of |
58753d74 KH |
1172 | the character. If STRING is not nil, it is a string containing the |
1173 | character to check, and CHARPOS and BYTEPOS are indices in the | |
1174 | string. In that case, FACE must not be NULL. | |
1175 | ||
1176 | If the character is composed, setup members of CMP_IT (id, nglyphs, | |
de1339b0 PE |
1177 | from, to, reversed_p), and return true. Otherwise, update |
1178 | CMP_IT->stop_pos, and return false. */ | |
58753d74 | 1179 | |
de1339b0 PE |
1180 | bool |
1181 | composition_reseat_it (struct composition_it *cmp_it, ptrdiff_t charpos, | |
1182 | ptrdiff_t bytepos, ptrdiff_t endpos, struct window *w, | |
1183 | struct face *face, Lisp_Object string) | |
58753d74 | 1184 | { |
3ffdafce KH |
1185 | if (cmp_it->ch == -2) |
1186 | { | |
1187 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string); | |
10f72a37 | 1188 | if (cmp_it->ch == -2 || cmp_it->stop_pos != charpos) |
82ebc97b | 1189 | /* The current position is not composed. */ |
3ffdafce KH |
1190 | return 0; |
1191 | } | |
1192 | ||
3cccbd87 KH |
1193 | if (endpos < 0) |
1194 | endpos = NILP (string) ? BEGV : 0; | |
1195 | ||
58753d74 KH |
1196 | if (cmp_it->ch < 0) |
1197 | { | |
1198 | /* We are looking at a static composition. */ | |
d311d28c | 1199 | ptrdiff_t start, end; |
58753d74 KH |
1200 | Lisp_Object prop; |
1201 | ||
1202 | find_composition (charpos, -1, &start, &end, &prop, string); | |
1203 | cmp_it->id = get_composition_id (charpos, bytepos, end - start, | |
1204 | prop, string); | |
1205 | if (cmp_it->id < 0) | |
1206 | goto no_composition; | |
1207 | cmp_it->nchars = end - start; | |
1208 | cmp_it->nglyphs = composition_table[cmp_it->id]->glyph_len; | |
1209 | } | |
29fb7306 | 1210 | else if (w) |
58753d74 | 1211 | { |
10f72a37 | 1212 | Lisp_Object lgstring = Qnil; |
b246f932 | 1213 | Lisp_Object val, elt; |
d311d28c | 1214 | ptrdiff_t i; |
58753d74 KH |
1215 | |
1216 | val = CHAR_TABLE_REF (Vcomposition_function_table, cmp_it->ch); | |
10f72a37 | 1217 | for (i = 0; i < cmp_it->rule_idx; i++, val = XCDR (val)); |
82ebc97b | 1218 | if (charpos < endpos) |
90b3fe91 | 1219 | { |
82ebc97b KH |
1220 | for (; CONSP (val); val = XCDR (val)) |
1221 | { | |
1222 | elt = XCAR (val); | |
10f72a37 KH |
1223 | if (! VECTORP (elt) || ASIZE (elt) != 3 |
1224 | || ! INTEGERP (AREF (elt, 1))) | |
1225 | continue; | |
1226 | if (XFASTINT (AREF (elt, 1)) != cmp_it->lookback) | |
aa3830c4 | 1227 | goto no_composition; |
10f72a37 KH |
1228 | lgstring = autocmp_chars (elt, charpos, bytepos, endpos, |
1229 | w, face, string); | |
1230 | if (composition_gstring_p (lgstring)) | |
82ebc97b | 1231 | break; |
10f72a37 KH |
1232 | lgstring = Qnil; |
1233 | /* Composition failed perhaps because the font doesn't | |
1234 | support sufficient range of characters. Try the | |
1235 | other composition rules if any. */ | |
82ebc97b | 1236 | } |
82ebc97b | 1237 | cmp_it->reversed_p = 0; |
90b3fe91 | 1238 | } |
82ebc97b KH |
1239 | else |
1240 | { | |
d311d28c | 1241 | ptrdiff_t cpos = charpos, bpos = bytepos; |
90b3fe91 | 1242 | |
3cccbd87 KH |
1243 | cmp_it->reversed_p = 1; |
1244 | elt = XCAR (val); | |
1245 | if (cmp_it->lookback > 0) | |
82ebc97b | 1246 | { |
3cccbd87 KH |
1247 | cpos = charpos - cmp_it->lookback; |
1248 | if (STRINGP (string)) | |
1249 | bpos = string_char_to_byte (string, cpos); | |
1250 | else | |
1251 | bpos = CHAR_TO_BYTE (cpos); | |
82ebc97b | 1252 | } |
3cccbd87 KH |
1253 | lgstring = autocmp_chars (elt, cpos, bpos, charpos + 1, w, face, |
1254 | string); | |
1255 | if (! composition_gstring_p (lgstring) | |
1256 | || cpos + LGSTRING_CHAR_LEN (lgstring) - 1 != charpos) | |
1257 | /* Composition failed or didn't cover the current | |
1258 | character. */ | |
1259 | goto no_composition; | |
82ebc97b | 1260 | } |
10f72a37 KH |
1261 | if (NILP (lgstring)) |
1262 | goto no_composition; | |
1263 | if (NILP (LGSTRING_ID (lgstring))) | |
1264 | lgstring = composition_gstring_put_cache (lgstring, -1); | |
1265 | cmp_it->id = XINT (LGSTRING_ID (lgstring)); | |
1266 | for (i = 0; i < LGSTRING_GLYPH_LEN (lgstring); i++) | |
1267 | if (NILP (LGSTRING_GLYPH (lgstring, i))) | |
58753d74 KH |
1268 | break; |
1269 | cmp_it->nglyphs = i; | |
82ebc97b KH |
1270 | cmp_it->from = 0; |
1271 | cmp_it->to = i; | |
58753d74 | 1272 | } |
29fb7306 KH |
1273 | else |
1274 | goto no_composition; | |
58753d74 KH |
1275 | return 1; |
1276 | ||
1277 | no_composition: | |
82ebc97b KH |
1278 | if (charpos == endpos) |
1279 | return 0; | |
1280 | if (charpos < endpos) | |
1281 | { | |
1282 | charpos++; | |
10f72a37 | 1283 | if (NILP (string)) |
82ebc97b | 1284 | INC_POS (bytepos); |
10f72a37 | 1285 | else |
aa3830c4 | 1286 | bytepos += BYTES_BY_CHAR_HEAD (*(SDATA (string) + bytepos)); |
82ebc97b | 1287 | } |
58753d74 | 1288 | else |
82ebc97b KH |
1289 | { |
1290 | charpos--; | |
1291 | /* BYTEPOS is calculated in composition_compute_stop_pos */ | |
1292 | bytepos = -1; | |
1293 | } | |
3cccbd87 KH |
1294 | if (cmp_it->reversed_p) |
1295 | endpos = -1; | |
58753d74 KH |
1296 | composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string); |
1297 | return 0; | |
1298 | } | |
1299 | ||
10f72a37 KH |
1300 | /* Update charpos, nchars, nbytes, and width of the current grapheme |
1301 | cluster. | |
1302 | ||
1303 | If the composition is static or automatic in L2R context, the | |
1304 | cluster is identified by CMP_IT->from, and CHARPOS is the position | |
1305 | of the first character of the cluster. In this case, update | |
1306 | CMP_IT->to too. | |
1307 | ||
1308 | If the composition is automatic in R2L context, the cluster is | |
1309 | identified by CMP_IT->to, and CHARPOS is the position of the last | |
1310 | character of the cluster. In this case, update CMP_IT->from too. | |
1311 | ||
1312 | The return value is the character code of the first character of | |
1313 | the cluster, or -1 if the composition is somehow broken. */ | |
82ebc97b | 1314 | |
58753d74 | 1315 | int |
d311d28c | 1316 | composition_update_it (struct composition_it *cmp_it, ptrdiff_t charpos, ptrdiff_t bytepos, Lisp_Object string) |
58753d74 | 1317 | { |
80e079b2 | 1318 | int i, c IF_LINT (= 0); |
58753d74 KH |
1319 | |
1320 | if (cmp_it->ch < 0) | |
1321 | { | |
10f72a37 | 1322 | /* static composition */ |
58753d74 KH |
1323 | struct composition *cmp = composition_table[cmp_it->id]; |
1324 | ||
10f72a37 | 1325 | cmp_it->charpos = charpos; |
58753d74 KH |
1326 | cmp_it->to = cmp_it->nglyphs; |
1327 | if (cmp_it->nglyphs == 0) | |
1328 | c = -1; | |
1329 | else | |
1330 | { | |
1331 | for (i = 0; i < cmp->glyph_len; i++) | |
bd01620e EZ |
1332 | /* TAB in a composition means display glyphs with padding |
1333 | space on the left or right. */ | |
58753d74 KH |
1334 | if ((c = COMPOSITION_GLYPH (cmp, i)) != '\t') |
1335 | break; | |
1336 | if (c == '\t') | |
1337 | c = ' '; | |
1338 | } | |
1339 | cmp_it->width = cmp->width; | |
10f72a37 KH |
1340 | charpos += cmp_it->nchars; |
1341 | if (STRINGP (string)) | |
1342 | cmp_it->nbytes = string_char_to_byte (string, charpos) - bytepos; | |
1343 | else | |
1344 | cmp_it->nbytes = CHAR_TO_BYTE (charpos) - bytepos; | |
58753d74 KH |
1345 | } |
1346 | else | |
1347 | { | |
b7432bb2 | 1348 | /* Automatic composition. */ |
58753d74 | 1349 | Lisp_Object gstring = composition_gstring_from_id (cmp_it->id); |
10f72a37 | 1350 | Lisp_Object glyph; |
d311d28c | 1351 | ptrdiff_t from; |
58753d74 KH |
1352 | |
1353 | if (cmp_it->nglyphs == 0) | |
1354 | { | |
58753d74 KH |
1355 | cmp_it->nchars = LGSTRING_CHAR_LEN (gstring); |
1356 | cmp_it->width = 0; | |
10f72a37 KH |
1357 | cmp_it->from = cmp_it->to = 0; |
1358 | return -1; | |
58753d74 | 1359 | } |
10f72a37 | 1360 | if (! cmp_it->reversed_p) |
58753d74 | 1361 | { |
10f72a37 KH |
1362 | glyph = LGSTRING_GLYPH (gstring, cmp_it->from); |
1363 | from = LGLYPH_FROM (glyph); | |
58753d74 KH |
1364 | for (cmp_it->to = cmp_it->from + 1; cmp_it->to < cmp_it->nglyphs; |
1365 | cmp_it->to++) | |
1366 | { | |
1367 | glyph = LGSTRING_GLYPH (gstring, cmp_it->to); | |
1368 | if (LGLYPH_FROM (glyph) != from) | |
1369 | break; | |
58753d74 | 1370 | } |
10f72a37 | 1371 | cmp_it->charpos = charpos; |
58753d74 | 1372 | } |
82ebc97b KH |
1373 | else |
1374 | { | |
10f72a37 KH |
1375 | glyph = LGSTRING_GLYPH (gstring, cmp_it->to - 1); |
1376 | from = LGLYPH_FROM (glyph); | |
1377 | cmp_it->charpos = charpos - (LGLYPH_TO (glyph) - from); | |
1378 | for (cmp_it->from = cmp_it->to - 1; cmp_it->from > 0; | |
1379 | cmp_it->from--) | |
82ebc97b | 1380 | { |
10f72a37 | 1381 | glyph = LGSTRING_GLYPH (gstring, cmp_it->from - 1); |
82ebc97b KH |
1382 | if (LGLYPH_FROM (glyph) != from) |
1383 | break; | |
82ebc97b | 1384 | } |
10f72a37 KH |
1385 | } |
1386 | glyph = LGSTRING_GLYPH (gstring, cmp_it->from); | |
1387 | cmp_it->nchars = LGLYPH_TO (glyph) + 1 - from; | |
1388 | cmp_it->nbytes = 0; | |
1389 | cmp_it->width = 0; | |
1390 | for (i = cmp_it->nchars - 1; i >= 0; i--) | |
1391 | { | |
d25f735b | 1392 | c = XINT (LGSTRING_CHAR (gstring, from + i)); |
10f72a37 | 1393 | cmp_it->nbytes += CHAR_BYTES (c); |
63257f6c | 1394 | cmp_it->width += CHAR_WIDTH (c); |
82ebc97b | 1395 | } |
58753d74 | 1396 | } |
58753d74 KH |
1397 | return c; |
1398 | } | |
1399 | ||
1400 | ||
90b3fe91 KH |
1401 | struct position_record |
1402 | { | |
d311d28c | 1403 | ptrdiff_t pos, pos_byte; |
90b3fe91 KH |
1404 | unsigned char *p; |
1405 | }; | |
1406 | ||
763d7377 | 1407 | /* Update the members of POSITION to the next character boundary. */ |
90b3fe91 KH |
1408 | #define FORWARD_CHAR(POSITION, STOP) \ |
1409 | do { \ | |
90b3fe91 | 1410 | (POSITION).pos++; \ |
900c4486 KH |
1411 | if ((POSITION).pos == (STOP)) \ |
1412 | { \ | |
1413 | (POSITION).p = GAP_END_ADDR; \ | |
1414 | (POSITION).pos_byte = GPT_BYTE; \ | |
1415 | } \ | |
1416 | else \ | |
1417 | { \ | |
900c4486 | 1418 | (POSITION).pos_byte += BYTES_BY_CHAR_HEAD (*((POSITION).p)); \ |
d45a49e3 | 1419 | (POSITION).p += BYTES_BY_CHAR_HEAD (*((POSITION).p)); \ |
900c4486 | 1420 | } \ |
90b3fe91 KH |
1421 | } while (0) |
1422 | ||
763d7377 | 1423 | /* Update the members of POSITION to the previous character boundary. */ |
90b3fe91 KH |
1424 | #define BACKWARD_CHAR(POSITION, STOP) \ |
1425 | do { \ | |
a28d4396 | 1426 | if ((POSITION).pos == (STOP)) \ |
90b3fe91 KH |
1427 | (POSITION).p = GPT_ADDR; \ |
1428 | do { \ | |
1429 | (POSITION).pos_byte--; \ | |
1430 | (POSITION).p--; \ | |
1431 | } while (! CHAR_HEAD_P (*((POSITION).p))); \ | |
1432 | (POSITION).pos--; \ | |
1433 | } while (0) | |
1434 | ||
90b3fe91 | 1435 | /* This is like find_composition, but find an automatic composition |
a28d4396 KH |
1436 | instead. It is assured that POS is not within a static |
1437 | composition. If found, set *GSTRING to the glyph-string | |
de1339b0 PE |
1438 | representing the composition, and return true. Otherwise, *GSTRING to |
1439 | Qnil, and return false. */ | |
90b3fe91 | 1440 | |
de1339b0 | 1441 | static bool |
d311d28c PE |
1442 | find_automatic_composition (ptrdiff_t pos, ptrdiff_t limit, |
1443 | ptrdiff_t *start, ptrdiff_t *end, | |
a28d4396 | 1444 | Lisp_Object *gstring, Lisp_Object string) |
90b3fe91 | 1445 | { |
d311d28c | 1446 | ptrdiff_t head, tail, stop; |
a28d4396 KH |
1447 | /* Forward limit position of checking a composition taking a |
1448 | looking-back count into account. */ | |
d311d28c | 1449 | ptrdiff_t fore_check_limit; |
a28d4396 | 1450 | struct position_record cur, prev; |
90b3fe91 | 1451 | int c; |
29fb7306 | 1452 | Lisp_Object window; |
90b3fe91 | 1453 | struct window *w; |
de1339b0 | 1454 | bool need_adjustment = 0; |
90b3fe91 | 1455 | |
3eda4b19 | 1456 | window = Fget_buffer_window (Fcurrent_buffer (), Qnil); |
29fb7306 KH |
1457 | if (NILP (window)) |
1458 | return 0; | |
1459 | w = XWINDOW (window); | |
1460 | ||
a28d4396 | 1461 | cur.pos = pos; |
90b3fe91 KH |
1462 | if (NILP (string)) |
1463 | { | |
1464 | head = BEGV, tail = ZV, stop = GPT; | |
a28d4396 KH |
1465 | cur.pos_byte = CHAR_TO_BYTE (cur.pos); |
1466 | cur.p = BYTE_POS_ADDR (cur.pos_byte); | |
90b3fe91 KH |
1467 | } |
1468 | else | |
1469 | { | |
1470 | head = 0, tail = SCHARS (string), stop = -1; | |
a28d4396 KH |
1471 | cur.pos_byte = string_char_to_byte (string, cur.pos); |
1472 | cur.p = SDATA (string) + cur.pos_byte; | |
90b3fe91 | 1473 | } |
a28d4396 KH |
1474 | if (limit < 0) |
1475 | /* Finding a composition covering the character after POS is the | |
1476 | same as setting LIMIT to POS. */ | |
1477 | limit = pos; | |
1478 | if (limit <= pos) | |
1479 | fore_check_limit = min (tail, pos + 1 + MAX_AUTO_COMPOSITION_LOOKBACK); | |
90b3fe91 | 1480 | else |
895416e3 | 1481 | fore_check_limit = min (tail, limit + MAX_AUTO_COMPOSITION_LOOKBACK); |
90b3fe91 | 1482 | |
a28d4396 | 1483 | /* Provided that we have these possible compositions now: |
895416e3 | 1484 | |
a28d4396 KH |
1485 | POS: 1 2 3 4 5 6 7 8 9 |
1486 | |-A-| | |
1487 | |-B-|-C-|--D--| | |
895416e3 | 1488 | |
a28d4396 | 1489 | Here, it is known that characters after positions 1 and 9 can |
9dc774d4 | 1490 | never be composed (i.e. ! char_composable_p (CH)), and |
a28d4396 KH |
1491 | composition A is an invalid one because it's partially covered by |
1492 | the valid composition C. And to know whether a composition is | |
1493 | valid or not, the only way is to start searching forward from a | |
1494 | position that can not be a tail part of composition (it's 2 in | |
1495 | the above case). | |
1496 | ||
1497 | Now we have these cases (1 through 4): | |
1498 | ||
1499 | -- character after POS is ... -- | |
1500 | not composable composable | |
1501 | LIMIT <= POS (1) (3) | |
1502 | POS < LIMIT (2) (4) | |
1503 | ||
1504 | Among them, in case (2), we simply search forward from POS. | |
1505 | ||
1506 | In the other cases, we at first rewind back to the position where | |
1507 | the previous character is not composable or the beginning of | |
1508 | buffer (string), then search compositions forward. In case (1) | |
1509 | and (3) we repeat this process until a composition is found. */ | |
1510 | ||
1511 | while (1) | |
1512 | { | |
62a6e103 | 1513 | c = STRING_CHAR (cur.p); |
9dc774d4 | 1514 | if (! char_composable_p (c)) |
90b3fe91 | 1515 | { |
a28d4396 KH |
1516 | if (limit <= pos) /* case (1) */ |
1517 | { | |
1518 | do { | |
31bfc35c | 1519 | if (cur.pos <= limit) |
a28d4396 KH |
1520 | return 0; |
1521 | BACKWARD_CHAR (cur, stop); | |
1522 | c = STRING_CHAR (cur.p); | |
9dc774d4 | 1523 | } while (! char_composable_p (c)); |
a28d4396 KH |
1524 | fore_check_limit = cur.pos + 1; |
1525 | } | |
1526 | else /* case (2) */ | |
1527 | /* No need of rewinding back. */ | |
1528 | goto search_forward; | |
1529 | } | |
90b3fe91 | 1530 | |
a28d4396 KH |
1531 | /* Rewind back to the position where we can safely search |
1532 | forward for compositions. It is assured that the character | |
1533 | at cur.pos is composable. */ | |
1534 | while (head < cur.pos) | |
1535 | { | |
1536 | prev = cur; | |
1537 | BACKWARD_CHAR (cur, stop); | |
1538 | c = STRING_CHAR (cur.p); | |
9dc774d4 | 1539 | if (! char_composable_p (c)) |
90b3fe91 | 1540 | { |
a28d4396 KH |
1541 | cur = prev; |
1542 | break; | |
90b3fe91 | 1543 | } |
a28d4396 KH |
1544 | } |
1545 | ||
1546 | search_forward: | |
1547 | /* Now search forward. */ | |
1548 | *gstring = Qnil; | |
1549 | prev = cur; /* remember the start of searching position. */ | |
1550 | while (cur.pos < fore_check_limit) | |
1551 | { | |
1552 | Lisp_Object val; | |
1553 | ||
1554 | c = STRING_CHAR (cur.p); | |
1555 | for (val = CHAR_TABLE_REF (Vcomposition_function_table, c); | |
1556 | CONSP (val); val = XCDR (val)) | |
90b3fe91 | 1557 | { |
a28d4396 KH |
1558 | Lisp_Object elt = XCAR (val); |
1559 | ||
1560 | if (VECTORP (elt) && ASIZE (elt) == 3 && NATNUMP (AREF (elt, 1))) | |
90b3fe91 | 1561 | { |
a28d4396 KH |
1562 | EMACS_INT check_pos = cur.pos - XFASTINT (AREF (elt, 1)); |
1563 | struct position_record check; | |
1564 | ||
1565 | if (check_pos < head | |
1566 | || (limit <= pos ? pos < check_pos | |
1567 | : limit <= check_pos)) | |
1568 | continue; | |
1569 | for (check = cur; check_pos < check.pos; ) | |
1570 | BACKWARD_CHAR (check, stop); | |
1571 | *gstring = autocmp_chars (elt, check.pos, check.pos_byte, | |
1572 | tail, w, NULL, string); | |
90b3fe91 | 1573 | need_adjustment = 1; |
a28d4396 | 1574 | if (NILP (*gstring)) |
90b3fe91 | 1575 | { |
a28d4396 KH |
1576 | /* As we have called Lisp, there's a possibility |
1577 | that buffer/string is relocated. */ | |
1578 | if (NILP (string)) | |
1579 | cur.p = BYTE_POS_ADDR (cur.pos_byte); | |
1580 | else | |
1581 | cur.p = SDATA (string) + cur.pos_byte; | |
1582 | } | |
1583 | else | |
1584 | { | |
1585 | /* We found a candidate of a target composition. */ | |
90b3fe91 KH |
1586 | *start = check.pos; |
1587 | *end = check.pos + LGSTRING_CHAR_LEN (*gstring); | |
a28d4396 KH |
1588 | if (pos < limit |
1589 | ? pos < *end | |
1590 | : *start <= pos && pos < *end) | |
1591 | /* This is the target composition. */ | |
90b3fe91 KH |
1592 | return 1; |
1593 | cur.pos = *end; | |
a28d4396 KH |
1594 | if (NILP (string)) |
1595 | { | |
1596 | cur.pos_byte = CHAR_TO_BYTE (cur.pos); | |
1597 | cur.p = BYTE_POS_ADDR (cur.pos_byte); | |
1598 | } | |
1599 | else | |
1600 | { | |
1601 | cur.pos_byte = string_char_to_byte (string, cur.pos); | |
1602 | cur.p = SDATA (string) + cur.pos_byte; | |
1603 | } | |
90b3fe91 KH |
1604 | break; |
1605 | } | |
1606 | } | |
1607 | } | |
a28d4396 KH |
1608 | if (! CONSP (val)) |
1609 | /* We found no composition here. */ | |
90b3fe91 | 1610 | FORWARD_CHAR (cur, stop); |
90b3fe91 | 1611 | } |
a28d4396 KH |
1612 | |
1613 | if (pos < limit) /* case (2) and (4)*/ | |
1614 | return 0; | |
1615 | if (! NILP (*gstring)) | |
1616 | return 1; | |
1617 | if (prev.pos == head) | |
1618 | return 0; | |
90b3fe91 | 1619 | cur = prev; |
a28d4396 KH |
1620 | if (need_adjustment) |
1621 | { | |
1622 | if (NILP (string)) | |
1623 | cur.p = BYTE_POS_ADDR (cur.pos_byte); | |
1624 | else | |
1625 | cur.p = SDATA (string) + cur.pos_byte; | |
1626 | } | |
90b3fe91 | 1627 | BACKWARD_CHAR (cur, stop); |
90b3fe91 | 1628 | } |
90b3fe91 KH |
1629 | } |
1630 | ||
e614ea00 KH |
1631 | /* Return the adjusted point provided that point is moved from LAST_PT |
1632 | to NEW_PT. */ | |
1633 | ||
d311d28c PE |
1634 | ptrdiff_t |
1635 | composition_adjust_point (ptrdiff_t last_pt, ptrdiff_t new_pt) | |
58753d74 | 1636 | { |
d311d28c | 1637 | ptrdiff_t i, beg, end; |
90b3fe91 | 1638 | Lisp_Object val; |
58753d74 | 1639 | |
e614ea00 KH |
1640 | if (new_pt == BEGV || new_pt == ZV) |
1641 | return new_pt; | |
58753d74 | 1642 | |
90b3fe91 | 1643 | /* At first check the static composition. */ |
e614ea00 | 1644 | if (get_property_and_range (new_pt, Qcomposition, &val, &beg, &end, Qnil) |
75c59fb3 | 1645 | && composition_valid_p (beg, end, val)) |
895416e3 | 1646 | { |
e614ea00 | 1647 | if (beg < new_pt /* && end > new_pt <- It's always the case. */ |
895416e3 | 1648 | && (last_pt <= beg || last_pt >= end)) |
e614ea00 KH |
1649 | return (new_pt < last_pt ? beg : end); |
1650 | return new_pt; | |
895416e3 | 1651 | } |
58753d74 | 1652 | |
4b4deea2 | 1653 | if (NILP (BVAR (current_buffer, enable_multibyte_characters)) |
d9a7c140 | 1654 | || NILP (Vauto_composition_mode)) |
e614ea00 | 1655 | return new_pt; |
58753d74 | 1656 | |
90b3fe91 | 1657 | /* Next check the automatic composition. */ |
d311d28c | 1658 | if (! find_automatic_composition (new_pt, (ptrdiff_t) -1, &beg, &end, &val, |
e614ea00 KH |
1659 | Qnil) |
1660 | || beg == new_pt) | |
1661 | return new_pt; | |
90b3fe91 | 1662 | for (i = 0; i < LGSTRING_GLYPH_LEN (val); i++) |
58753d74 | 1663 | { |
90b3fe91 | 1664 | Lisp_Object glyph = LGSTRING_GLYPH (val, i); |
58753d74 | 1665 | |
90b3fe91 KH |
1666 | if (NILP (glyph)) |
1667 | break; | |
e614ea00 KH |
1668 | if (beg + LGLYPH_FROM (glyph) == new_pt) |
1669 | return new_pt; | |
1670 | if (beg + LGLYPH_TO (glyph) >= new_pt) | |
1671 | return (new_pt < last_pt | |
90b3fe91 KH |
1672 | ? beg + LGLYPH_FROM (glyph) |
1673 | : beg + LGLYPH_TO (glyph) + 1); | |
58753d74 | 1674 | } |
e614ea00 | 1675 | return new_pt; |
58753d74 KH |
1676 | } |
1677 | ||
1678 | DEFUN ("composition-get-gstring", Fcomposition_get_gstring, | |
1679 | Scomposition_get_gstring, 4, 4, 0, | |
1680 | doc: /* Return a glyph-string for characters between FROM and TO. | |
9d751859 | 1681 | If the glyph string is for graphic display, FONT-OBJECT must be |
58753d74 | 1682 | a font-object to use for those characters. |
f5199465 KH |
1683 | Otherwise (for terminal display), FONT-OBJECT must be a terminal ID, a |
1684 | frame, or nil for the selected frame's terminal device. | |
58753d74 KH |
1685 | |
1686 | If the optional 4th argument STRING is not nil, it is a string | |
51e12e8e DA |
1687 | containing the target characters between indices FROM and TO, |
1688 | which are treated as in `substring'. Otherwise FROM and TO are | |
1689 | character positions in current buffer; they can be in either order, | |
1690 | and can be integers or markers. | |
58753d74 | 1691 | |
9d751859 EZ |
1692 | A glyph-string is a vector containing information about how to display |
1693 | a specific character sequence. The format is: | |
58753d74 KH |
1694 | [HEADER ID GLYPH ...] |
1695 | ||
1696 | HEADER is a vector of this form: | |
1697 | [FONT-OBJECT CHAR ...] | |
1698 | where | |
1699 | FONT-OBJECT is a font-object for all glyphs in the glyph-string, | |
f5199465 | 1700 | or the terminal coding system of the specified terminal. |
58753d74 KH |
1701 | CHARs are characters to be composed by GLYPHs. |
1702 | ||
1703 | ID is an identification number of the glyph-string. It may be nil if | |
1704 | not yet shaped. | |
1705 | ||
9d751859 | 1706 | GLYPH is a vector whose elements have this form: |
58753d74 KH |
1707 | [ FROM-IDX TO-IDX C CODE WIDTH LBEARING RBEARING ASCENT DESCENT |
1708 | [ [X-OFF Y-OFF WADJUST] | nil] ] | |
1709 | where | |
1710 | FROM-IDX and TO-IDX are used internally and should not be touched. | |
1711 | C is the character of the glyph. | |
1712 | CODE is the glyph-code of C in FONT-OBJECT. | |
1713 | WIDTH thru DESCENT are the metrics (in pixels) of the glyph. | |
9d751859 | 1714 | X-OFF and Y-OFF are offsets to the base position for the glyph. |
58753d74 KH |
1715 | WADJUST is the adjustment to the normal width of the glyph. |
1716 | ||
9d751859 EZ |
1717 | If GLYPH is nil, the remaining elements of the glyph-string vector |
1718 | should be ignored. */) | |
5842a27b | 1719 | (Lisp_Object from, Lisp_Object to, Lisp_Object font_object, Lisp_Object string) |
58753d74 KH |
1720 | { |
1721 | Lisp_Object gstring, header; | |
28c16c40 | 1722 | ptrdiff_t frompos, frombyte, topos; |
58753d74 | 1723 | |
f5199465 KH |
1724 | if (! FONT_OBJECT_P (font_object)) |
1725 | { | |
1726 | struct coding_system *coding; | |
1727 | struct terminal *terminal = get_terminal (font_object, 1); | |
1728 | ||
1729 | coding = ((TERMINAL_TERMINAL_CODING (terminal)->common_flags | |
1730 | & CODING_REQUIRE_ENCODING_MASK) | |
1731 | ? TERMINAL_TERMINAL_CODING (terminal) : &safe_terminal_coding); | |
1732 | font_object = CODING_ID_NAME (coding->id); | |
1733 | } | |
1734 | ||
28c16c40 DA |
1735 | if (NILP (string)) |
1736 | { | |
1737 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) | |
1738 | error ("Attempt to shape unibyte text"); | |
1739 | validate_region (&from, &to); | |
1740 | frompos = XFASTINT (from); | |
1741 | topos = XFASTINT (to); | |
1742 | frombyte = CHAR_TO_BYTE (frompos); | |
1743 | } | |
1744 | else | |
1745 | { | |
28c16c40 | 1746 | CHECK_STRING (string); |
51e12e8e | 1747 | validate_subarray (string, from, to, SCHARS (string), &frompos, &topos); |
28c16c40 DA |
1748 | if (! STRING_MULTIBYTE (string)) |
1749 | error ("Attempt to shape unibyte text"); | |
28c16c40 DA |
1750 | frombyte = string_char_to_byte (string, frompos); |
1751 | } | |
1752 | ||
1753 | header = fill_gstring_header (Qnil, frompos, frombyte, | |
1754 | topos, font_object, string); | |
58753d74 KH |
1755 | gstring = gstring_lookup_cache (header); |
1756 | if (! NILP (gstring)) | |
1757 | return gstring; | |
46f905e1 | 1758 | |
46f905e1 SM |
1759 | if (LGSTRING_GLYPH_LEN (gstring_work) < topos - frompos) |
1760 | gstring_work = Fmake_vector (make_number (topos - frompos + 2), Qnil); | |
58753d74 KH |
1761 | LGSTRING_SET_HEADER (gstring_work, header); |
1762 | LGSTRING_SET_ID (gstring_work, Qnil); | |
1763 | fill_gstring_body (gstring_work); | |
1764 | return gstring_work; | |
1765 | } | |
1766 | ||
ca4c9455 KH |
1767 | \f |
1768 | /* Emacs Lisp APIs. */ | |
1769 | ||
1770 | DEFUN ("compose-region-internal", Fcompose_region_internal, | |
1771 | Scompose_region_internal, 2, 4, 0, | |
335c5470 PJ |
1772 | doc: /* Internal use only. |
1773 | ||
1774 | Compose text in the region between START and END. | |
1775 | Optional 3rd and 4th arguments are COMPONENTS and MODIFICATION-FUNC | |
9d751859 | 1776 | for the composition. See `compose-region' for more details. */) |
5842a27b | 1777 | (Lisp_Object start, Lisp_Object end, Lisp_Object components, Lisp_Object modification_func) |
ca4c9455 KH |
1778 | { |
1779 | validate_region (&start, &end); | |
1780 | if (!NILP (components) | |
1781 | && !INTEGERP (components) | |
1782 | && !CONSP (components) | |
1783 | && !STRINGP (components)) | |
b7826503 | 1784 | CHECK_VECTOR (components); |
ca4c9455 | 1785 | |
d562f8ab | 1786 | compose_text (XINT (start), XINT (end), components, modification_func, Qnil); |
ca4c9455 KH |
1787 | return Qnil; |
1788 | } | |
1789 | ||
1790 | DEFUN ("compose-string-internal", Fcompose_string_internal, | |
1791 | Scompose_string_internal, 3, 5, 0, | |
335c5470 PJ |
1792 | doc: /* Internal use only. |
1793 | ||
51e12e8e DA |
1794 | Compose text between indices START and END of STRING, where |
1795 | START and END are treated as in `substring'. Optional 4th | |
1796 | and 5th arguments are COMPONENTS and MODIFICATION-FUNC | |
9d751859 | 1797 | for the composition. See `compose-string' for more details. */) |
51e12e8e DA |
1798 | (Lisp_Object string, Lisp_Object start, Lisp_Object end, |
1799 | Lisp_Object components, Lisp_Object modification_func) | |
ca4c9455 | 1800 | { |
51e12e8e | 1801 | ptrdiff_t from, to; |
ca4c9455 | 1802 | |
51e12e8e DA |
1803 | CHECK_STRING (string); |
1804 | validate_subarray (string, start, end, SCHARS (string), &from, &to); | |
1805 | compose_text (from, to, components, modification_func, string); | |
ca4c9455 KH |
1806 | return string; |
1807 | } | |
1808 | ||
1809 | DEFUN ("find-composition-internal", Ffind_composition_internal, | |
177c0ea7 | 1810 | Sfind_composition_internal, 4, 4, 0, |
335c5470 PJ |
1811 | doc: /* Internal use only. |
1812 | ||
1813 | Return information about composition at or nearest to position POS. | |
9d751859 | 1814 | See `find-composition' for more details. */) |
5842a27b | 1815 | (Lisp_Object pos, Lisp_Object limit, Lisp_Object string, Lisp_Object detail_p) |
ca4c9455 | 1816 | { |
90b3fe91 | 1817 | Lisp_Object prop, tail, gstring; |
d311d28c | 1818 | ptrdiff_t start, end, from, to; |
ca4c9455 KH |
1819 | int id; |
1820 | ||
b7826503 | 1821 | CHECK_NUMBER_COERCE_MARKER (pos); |
ca4c9455 KH |
1822 | if (!NILP (limit)) |
1823 | { | |
b7826503 | 1824 | CHECK_NUMBER_COERCE_MARKER (limit); |
d311d28c | 1825 | to = min (XINT (limit), ZV); |
ca4c9455 KH |
1826 | } |
1827 | else | |
90b3fe91 | 1828 | to = -1; |
177c0ea7 | 1829 | |
ca4c9455 | 1830 | if (!NILP (string)) |
e3b3e327 | 1831 | { |
b7826503 | 1832 | CHECK_STRING (string); |
d5db4077 | 1833 | if (XINT (pos) < 0 || XINT (pos) > SCHARS (string)) |
e3b3e327 GM |
1834 | args_out_of_range (string, pos); |
1835 | } | |
1836 | else | |
1837 | { | |
fa9090b8 | 1838 | if (XINT (pos) < BEGV || XINT (pos) > ZV) |
e3b3e327 GM |
1839 | args_out_of_range (Fcurrent_buffer (), pos); |
1840 | } | |
d311d28c | 1841 | from = XINT (pos); |
ca4c9455 | 1842 | |
90b3fe91 KH |
1843 | if (!find_composition (from, to, &start, &end, &prop, string)) |
1844 | { | |
4b4deea2 | 1845 | if (!NILP (BVAR (current_buffer, enable_multibyte_characters)) |
d9a7c140 | 1846 | && ! NILP (Vauto_composition_mode) |
90b3fe91 KH |
1847 | && find_automatic_composition (from, to, &start, &end, &gstring, |
1848 | string)) | |
1849 | return list3 (make_number (start), make_number (end), gstring); | |
1850 | return Qnil; | |
1851 | } | |
1852 | if ((end <= XINT (pos) || start > XINT (pos))) | |
1853 | { | |
d311d28c | 1854 | ptrdiff_t s, e; |
90b3fe91 KH |
1855 | |
1856 | if (find_automatic_composition (from, to, &s, &e, &gstring, string) | |
1857 | && (e <= XINT (pos) ? e > end : s < start)) | |
fcebfc6a | 1858 | return list3 (make_number (s), make_number (e), gstring); |
90b3fe91 | 1859 | } |
75c59fb3 | 1860 | if (!composition_valid_p (start, end, prop)) |
6c6f1994 | 1861 | return list3 (make_number (start), make_number (end), Qnil); |
ca4c9455 | 1862 | if (NILP (detail_p)) |
6c6f1994 | 1863 | return list3 (make_number (start), make_number (end), Qt); |
ca4c9455 | 1864 | |
98f638d6 | 1865 | if (composition_registered_p (prop)) |
ca4c9455 KH |
1866 | id = COMPOSITION_ID (prop); |
1867 | else | |
1868 | { | |
d311d28c | 1869 | ptrdiff_t start_byte = (NILP (string) |
579c18d0 EZ |
1870 | ? CHAR_TO_BYTE (start) |
1871 | : string_char_to_byte (string, start)); | |
ca4c9455 KH |
1872 | id = get_composition_id (start, start_byte, end - start, prop, string); |
1873 | } | |
1874 | ||
1875 | if (id >= 0) | |
1876 | { | |
1877 | Lisp_Object components, relative_p, mod_func; | |
75c59fb3 | 1878 | enum composition_method method = composition_method (prop); |
ca4c9455 KH |
1879 | int width = composition_table[id]->width; |
1880 | ||
1881 | components = Fcopy_sequence (COMPOSITION_COMPONENTS (prop)); | |
1882 | relative_p = (method == COMPOSITION_WITH_RULE_ALTCHARS | |
1883 | ? Qnil : Qt); | |
1884 | mod_func = COMPOSITION_MODIFICATION_FUNC (prop); | |
6c6f1994 | 1885 | tail = list4 (components, relative_p, mod_func, make_number (width)); |
ca4c9455 KH |
1886 | } |
1887 | else | |
1888 | tail = Qnil; | |
1889 | ||
1890 | return Fcons (make_number (start), Fcons (make_number (end), tail)); | |
1891 | } | |
1892 | ||
1893 | \f | |
1894 | void | |
971de7fb | 1895 | syms_of_composite (void) |
ca4c9455 | 1896 | { |
58753d74 KH |
1897 | int i; |
1898 | ||
cd3520a4 | 1899 | DEFSYM (Qcomposition, "composition"); |
ca4c9455 | 1900 | |
58753d74 | 1901 | /* Make a hash table for static composition. */ |
ca4c9455 | 1902 | { |
09654086 | 1903 | Lisp_Object args[6]; |
177c0ea7 | 1904 | |
ca4c9455 KH |
1905 | args[0] = QCtest; |
1906 | args[1] = Qequal; | |
1907 | args[2] = QCweakness; | |
dc47eccc | 1908 | /* We used to make the hash table weak so that unreferenced |
ca101cff | 1909 | compositions can be garbage-collected. But, usually once |
dc47eccc KH |
1910 | created compositions are repeatedly used in an Emacs session, |
1911 | and thus it's not worth to save memory in such a way. So, we | |
1912 | make the table not weak. */ | |
6a83ee8a | 1913 | args[3] = Qnil; |
ca4c9455 KH |
1914 | args[4] = QCsize; |
1915 | args[5] = make_number (311); | |
09654086 | 1916 | composition_hash_table = Fmake_hash_table (6, args); |
ca4c9455 KH |
1917 | staticpro (&composition_hash_table); |
1918 | } | |
1919 | ||
58753d74 KH |
1920 | /* Make a hash table for glyph-string. */ |
1921 | { | |
1922 | Lisp_Object args[6]; | |
58753d74 KH |
1923 | args[0] = QCtest; |
1924 | args[1] = Qequal; | |
1925 | args[2] = QCweakness; | |
1926 | args[3] = Qnil; | |
1927 | args[4] = QCsize; | |
1928 | args[5] = make_number (311); | |
1929 | gstring_hash_table = Fmake_hash_table (6, args); | |
1930 | staticpro (&gstring_hash_table); | |
1931 | } | |
1932 | ||
1933 | staticpro (&gstring_work_headers); | |
25721f5b | 1934 | gstring_work_headers = make_uninit_vector (8); |
58753d74 KH |
1935 | for (i = 0; i < 8; i++) |
1936 | ASET (gstring_work_headers, i, Fmake_vector (make_number (i + 2), Qnil)); | |
1937 | staticpro (&gstring_work); | |
1938 | gstring_work = Fmake_vector (make_number (10), Qnil); | |
1939 | ||
ca4c9455 KH |
1940 | /* Text property `composition' should be nonsticky by default. */ |
1941 | Vtext_property_default_nonsticky | |
1942 | = Fcons (Fcons (Qcomposition, Qt), Vtext_property_default_nonsticky); | |
1943 | ||
29208e82 | 1944 | DEFVAR_LISP ("compose-chars-after-function", Vcompose_chars_after_function, |
335c5470 PJ |
1945 | doc: /* Function to adjust composition of buffer text. |
1946 | ||
9d751859 EZ |
1947 | This function is called with three arguments: FROM, TO, and OBJECT. |
1948 | FROM and TO specify the range of text whose composition should be | |
335c5470 PJ |
1949 | adjusted. OBJECT, if non-nil, is a string that contains the text. |
1950 | ||
1951 | This function is called after a text with `composition' property is | |
1952 | inserted or deleted to keep `composition' property of buffer text | |
1953 | valid. | |
1954 | ||
1955 | The default value is the function `compose-chars-after'. */); | |
d67b4f80 | 1956 | Vcompose_chars_after_function = intern_c_string ("compose-chars-after"); |
ca4c9455 | 1957 | |
cd3520a4 JB |
1958 | DEFSYM (Qauto_composed, "auto-composed"); |
1959 | DEFSYM (Qauto_composition_function, "auto-composition-function"); | |
40add26d | 1960 | |
29208e82 | 1961 | DEFVAR_LISP ("auto-composition-mode", Vauto_composition_mode, |
d9a7c140 KH |
1962 | doc: /* Non-nil if Auto-Composition mode is enabled. |
1963 | Use the command `auto-composition-mode' to change this variable. */); | |
1964 | Vauto_composition_mode = Qt; | |
1965 | ||
29208e82 | 1966 | DEFVAR_LISP ("auto-composition-function", Vauto_composition_function, |
f96ba4c1 | 1967 | doc: /* Function to call to compose characters automatically. |
9d751859 | 1968 | This function is called from the display routine with four arguments: |
ddc872ba | 1969 | FROM, TO, WINDOW, and STRING. |
335c5470 | 1970 | |
ddc872ba KH |
1971 | If STRING is nil, the function must compose characters in the region |
1972 | between FROM and TO in the current buffer. | |
335c5470 | 1973 | |
ddc872ba KH |
1974 | Otherwise, STRING is a string, and FROM and TO are indices into the |
1975 | string. In this case, the function must compose characters in the | |
1976 | string. */); | |
f96ba4c1 | 1977 | Vauto_composition_function = Qnil; |
40add26d | 1978 | |
29208e82 | 1979 | DEFVAR_LISP ("composition-function-table", Vcomposition_function_table, |
9d751859 | 1980 | doc: /* Char-table of functions for automatic character composition. |
58753d74 KH |
1981 | For each character that has to be composed automatically with |
1982 | preceding and/or following characters, this char-table contains | |
1983 | a function to call to compose that character. | |
1984 | ||
1985 | The element at index C in the table, if non-nil, is a list of | |
10f72a37 | 1986 | composition rules of this form: ([PATTERN PREV-CHARS FUNC] ...) |
58753d74 | 1987 | |
9d751859 | 1988 | PATTERN is a regular expression which C and the surrounding |
58753d74 KH |
1989 | characters must match. |
1990 | ||
895416e3 KH |
1991 | PREV-CHARS is a non-negative integer (less than 4) specifying how many |
1992 | characters before C to check the matching with PATTERN. If it is 0, | |
1993 | PATTERN must match C and the following characters. If it is 1, | |
1994 | PATTERN must match a character before C and the following characters. | |
58753d74 KH |
1995 | |
1996 | If PREV-CHARS is 0, PATTERN can be nil, which means that the | |
1997 | single character C should be composed. | |
1998 | ||
1999 | FUNC is a function to return a glyph-string representing a | |
9d751859 | 2000 | composition of the characters that match PATTERN. It is |
58753d74 KH |
2001 | called with one argument GSTRING. |
2002 | ||
2003 | GSTRING is a template of a glyph-string to return. It is already | |
2004 | filled with a proper header for the characters to compose, and | |
2005 | glyphs corresponding to those characters one by one. The | |
9d751859 | 2006 | function must return a new glyph-string with the same header as |
58753d74 KH |
2007 | GSTRING, or modify GSTRING itself and return it. |
2008 | ||
2009 | See also the documentation of `auto-composition-mode'. */); | |
2010 | Vcomposition_function_table = Fmake_char_table (Qnil, Qnil); | |
2011 | ||
ca4c9455 KH |
2012 | defsubr (&Scompose_region_internal); |
2013 | defsubr (&Scompose_string_internal); | |
2014 | defsubr (&Sfind_composition_internal); | |
58753d74 | 2015 | defsubr (&Scomposition_get_gstring); |
ca4c9455 | 2016 | } |