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New feature optionally to accelerate auto-repeated scrolling.
[emacs.git] / src / character.h
blob624f4fff3f0960b784168e6c784194d10d0230db
1 /* Header for multibyte character handler.
2 Copyright (C) 1995, 1997, 1998 Electrotechnical Laboratory, JAPAN.
3 Licensed to the Free Software Foundation.
4 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
5 National Institute of Advanced Industrial Science and Technology (AIST)
6 Registration Number H13PRO009
7
8 This file is part of GNU Emacs.
9
10 GNU Emacs is free software: you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation, either version 3 of the License, or
13 (at your option) any later version.
14
15 GNU Emacs is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
22
23 #ifndef EMACS_CHARACTER_H
24 #define EMACS_CHARACTER_H
25
26 #include <verify.h>
27
28 INLINE_HEADER_BEGIN
29
30 /* character code 1st byte byte sequence
31 -------------- -------- -------------
32 0-7F 00..7F 0xxxxxxx
33 80-7FF C2..DF 110xxxxx 10xxxxxx
34 800-FFFF E0..EF 1110xxxx 10xxxxxx 10xxxxxx
35 10000-1FFFFF F0..F7 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
36 200000-3FFF7F F8 11111000 1000xxxx 10xxxxxx 10xxxxxx 10xxxxxx
37 3FFF80-3FFFFF C0..C1 1100000x 10xxxxxx (for eight-bit-char)
38 400000-... invalid
39
40 invalid 1st byte 80..BF 10xxxxxx
41 F9..FF 11111xxx (xxx != 000)
42 */
43
44 /* Maximum character code ((1 << CHARACTERBITS) - 1). */
45 #define MAX_CHAR 0x3FFFFF
46
47 /* Maximum Unicode character code. */
48 #define MAX_UNICODE_CHAR 0x10FFFF
49
50 /* Maximum N-byte character codes. */
51 #define MAX_1_BYTE_CHAR 0x7F
52 #define MAX_2_BYTE_CHAR 0x7FF
53 #define MAX_3_BYTE_CHAR 0xFFFF
54 #define MAX_4_BYTE_CHAR 0x1FFFFF
55 #define MAX_5_BYTE_CHAR 0x3FFF7F
56
57 /* Minimum leading code of multibyte characters. */
58 #define MIN_MULTIBYTE_LEADING_CODE 0xC0
59 /* Maximum leading code of multibyte characters. */
60 #define MAX_MULTIBYTE_LEADING_CODE 0xF8
61
62 /* Nonzero iff C is a character that corresponds to a raw 8-bit
63 byte. */
64 #define CHAR_BYTE8_P(c) ((c) > MAX_5_BYTE_CHAR)
65
66 /* Return the character code for raw 8-bit byte BYTE. */
67 #define BYTE8_TO_CHAR(byte) ((byte) + 0x3FFF00)
68
69 #define UNIBYTE_TO_CHAR(byte) \
70 (ASCII_CHAR_P (byte) ? (byte) : BYTE8_TO_CHAR (byte))
71
72 /* Return the raw 8-bit byte for character C. */
73 #define CHAR_TO_BYTE8(c) (CHAR_BYTE8_P (c) ? (c) - 0x3FFF00 : (c & 0xFF))
74
75 /* Return the raw 8-bit byte for character C,
76 or -1 if C doesn't correspond to a byte. */
77 #define CHAR_TO_BYTE_SAFE(c) \
78 (ASCII_CHAR_P (c) ? c : (CHAR_BYTE8_P (c) ? (c) - 0x3FFF00 : -1))
79
80 /* Nonzero iff BYTE is the 1st byte of a multibyte form of a character
81 that corresponds to a raw 8-bit byte. */
82 #define CHAR_BYTE8_HEAD_P(byte) ((byte) == 0xC0 || (byte) == 0xC1)
83
84 /* If C is not ASCII, make it unibyte. */
85 #define MAKE_CHAR_UNIBYTE(c) \
86 do { \
87 if (! ASCII_CHAR_P (c)) \
88 c = CHAR_TO_BYTE8 (c); \
89 } while (false)
90
91
92 /* If C is not ASCII, make it multibyte. Assumes C < 256. */
93 #define MAKE_CHAR_MULTIBYTE(c) \
94 (eassert ((c) >= 0 && (c) < 256), (c) = UNIBYTE_TO_CHAR (c))
95
96 /* This is the maximum byte length of multibyte form. */
97 #define MAX_MULTIBYTE_LENGTH 5
98
99 /* Nonzero iff X is a character. */
100 #define CHARACTERP(x) (NATNUMP (x) && XFASTINT (x) <= MAX_CHAR)
101
102 /* Nonzero iff C is valid as a character code. */
103 #define CHAR_VALID_P(c) UNSIGNED_CMP (c, <=, MAX_CHAR)
104
105 /* Check if Lisp object X is a character or not. */
106 #define CHECK_CHARACTER(x) \
107 CHECK_TYPE (CHARACTERP (x), Qcharacterp, x)
108
109 #define CHECK_CHARACTER_CAR(x) \
110 do { \
111 Lisp_Object tmp = XCAR (x); \
112 CHECK_CHARACTER (tmp); \
113 XSETCAR ((x), tmp); \
114 } while (false)
115
116 #define CHECK_CHARACTER_CDR(x) \
117 do { \
118 Lisp_Object tmp = XCDR (x); \
119 CHECK_CHARACTER (tmp); \
120 XSETCDR ((x), tmp); \
121 } while (false)
122
123 /* Nonzero iff C is a character of code less than 0x100. */
124 #define SINGLE_BYTE_CHAR_P(c) UNSIGNED_CMP (c, <, 0x100)
125
126 /* Nonzero if character C has a printable glyph. */
127 #define CHAR_PRINTABLE_P(c) \
128 (((c) >= 32 && (c) < 127) \
129 || ! NILP (CHAR_TABLE_REF (Vprintable_chars, (c))))
130
131 /* Return byte length of multibyte form for character C. */
132 #define CHAR_BYTES(c) \
133 ( (c) <= MAX_1_BYTE_CHAR ? 1 \
134 : (c) <= MAX_2_BYTE_CHAR ? 2 \
135 : (c) <= MAX_3_BYTE_CHAR ? 3 \
136 : (c) <= MAX_4_BYTE_CHAR ? 4 \
137 : (c) <= MAX_5_BYTE_CHAR ? 5 \
138 : 2)
139
140
141 /* Return the leading code of multibyte form of C. */
142 #define CHAR_LEADING_CODE(c) \
143 ((c) <= MAX_1_BYTE_CHAR ? c \
144 : (c) <= MAX_2_BYTE_CHAR ? (0xC0 | ((c) >> 6)) \
145 : (c) <= MAX_3_BYTE_CHAR ? (0xE0 | ((c) >> 12)) \
146 : (c) <= MAX_4_BYTE_CHAR ? (0xF0 | ((c) >> 18)) \
147 : (c) <= MAX_5_BYTE_CHAR ? 0xF8 \
148 : (0xC0 | (((c) >> 6) & 0x01)))
149
150
151 /* Store multibyte form of the character C in P. The caller should
152 allocate at least MAX_MULTIBYTE_LENGTH bytes area at P in advance.
153 Returns the length of the multibyte form. */
154
155 #define CHAR_STRING(c, p) \
156 (UNSIGNED_CMP (c, <=, MAX_1_BYTE_CHAR) \
157 ? ((p)[0] = (c), \
158 1) \
159 : UNSIGNED_CMP (c, <=, MAX_2_BYTE_CHAR) \
160 ? ((p)[0] = (0xC0 | ((c) >> 6)), \
161 (p)[1] = (0x80 | ((c) & 0x3F)), \
162 2) \
163 : UNSIGNED_CMP (c, <=, MAX_3_BYTE_CHAR) \
164 ? ((p)[0] = (0xE0 | ((c) >> 12)), \
165 (p)[1] = (0x80 | (((c) >> 6) & 0x3F)), \
166 (p)[2] = (0x80 | ((c) & 0x3F)), \
167 3) \
168 : verify_expr (sizeof (c) <= sizeof (unsigned), char_string (c, p)))
169
170 /* Store multibyte form of byte B in P. The caller should allocate at
171 least MAX_MULTIBYTE_LENGTH bytes area at P in advance. Returns the
172 length of the multibyte form. */
173
174 #define BYTE8_STRING(b, p) \
175 ((p)[0] = (0xC0 | (((b) >> 6) & 0x01)), \
176 (p)[1] = (0x80 | ((b) & 0x3F)), \
177 2)
178
179
180 /* Store multibyte form of the character C in P and advance P to the
181 end of the multibyte form. The caller should allocate at least
182 MAX_MULTIBYTE_LENGTH bytes area at P in advance. */
183
184 #define CHAR_STRING_ADVANCE(c, p) \
185 do { \
186 if ((c) <= MAX_1_BYTE_CHAR) \
187 *(p)++ = (c); \
188 else if ((c) <= MAX_2_BYTE_CHAR) \
189 *(p)++ = (0xC0 | ((c) >> 6)), \
190 *(p)++ = (0x80 | ((c) & 0x3F)); \
191 else if ((c) <= MAX_3_BYTE_CHAR) \
192 *(p)++ = (0xE0 | ((c) >> 12)), \
193 *(p)++ = (0x80 | (((c) >> 6) & 0x3F)), \
194 *(p)++ = (0x80 | ((c) & 0x3F)); \
195 else \
196 { \
197 verify (sizeof (c) <= sizeof (unsigned)); \
198 (p) += char_string (c, p); \
199 } \
200 } while (false)
201
202
203 /* Nonzero iff BYTE starts a non-ASCII character in a multibyte
204 form. */
205 #define LEADING_CODE_P(byte) (((byte) & 0xC0) == 0xC0)
206
207 /* Nonzero iff BYTE is a trailing code of a non-ASCII character in a
208 multibyte form. */
209 #define TRAILING_CODE_P(byte) (((byte) & 0xC0) == 0x80)
210
211 /* Nonzero iff BYTE starts a character in a multibyte form.
212 This is equivalent to:
213 (ASCII_CHAR_P (byte) || LEADING_CODE_P (byte)) */
214 #define CHAR_HEAD_P(byte) (((byte) & 0xC0) != 0x80)
215
216 /* How many bytes a character that starts with BYTE occupies in a
217 multibyte form. */
218 #define BYTES_BY_CHAR_HEAD(byte) \
219 (!((byte) & 0x80) ? 1 \
220 : !((byte) & 0x20) ? 2 \
221 : !((byte) & 0x10) ? 3 \
222 : !((byte) & 0x08) ? 4 \
223 : 5)
224
225
226 /* The byte length of multibyte form at unibyte string P ending at
227 PEND. If STR doesn't point to a valid multibyte form, return 0. */
228
229 #define MULTIBYTE_LENGTH(p, pend) \
230 (p >= pend ? 0 \
231 : !((p)[0] & 0x80) ? 1 \
232 : ((p + 1 >= pend) || (((p)[1] & 0xC0) != 0x80)) ? 0 \
233 : ((p)[0] & 0xE0) == 0xC0 ? 2 \
234 : ((p + 2 >= pend) || (((p)[2] & 0xC0) != 0x80)) ? 0 \
235 : ((p)[0] & 0xF0) == 0xE0 ? 3 \
236 : ((p + 3 >= pend) || (((p)[3] & 0xC0) != 0x80)) ? 0 \
237 : ((p)[0] & 0xF8) == 0xF0 ? 4 \
238 : ((p + 4 >= pend) || (((p)[4] & 0xC0) != 0x80)) ? 0 \
239 : (p)[0] == 0xF8 && ((p)[1] & 0xF0) == 0x80 ? 5 \
240 : 0)
241
242
243 /* Like MULTIBYTE_LENGTH, but don't check the ending address. */
244
245 #define MULTIBYTE_LENGTH_NO_CHECK(p) \
246 (!((p)[0] & 0x80) ? 1 \
247 : ((p)[1] & 0xC0) != 0x80 ? 0 \
248 : ((p)[0] & 0xE0) == 0xC0 ? 2 \
249 : ((p)[2] & 0xC0) != 0x80 ? 0 \
250 : ((p)[0] & 0xF0) == 0xE0 ? 3 \
251 : ((p)[3] & 0xC0) != 0x80 ? 0 \
252 : ((p)[0] & 0xF8) == 0xF0 ? 4 \
253 : ((p)[4] & 0xC0) != 0x80 ? 0 \
254 : (p)[0] == 0xF8 && ((p)[1] & 0xF0) == 0x80 ? 5 \
255 : 0)
256
257 /* If P is before LIMIT, advance P to the next character boundary.
258 Assumes that P is already at a character boundary of the same
259 multibyte form whose end address is LIMIT. */
260
261 #define NEXT_CHAR_BOUNDARY(p, limit) \
262 do { \
263 if ((p) < (limit)) \
264 (p) += BYTES_BY_CHAR_HEAD (*(p)); \
265 } while (false)
266
267
268 /* If P is after LIMIT, advance P to the previous character boundary.
269 Assumes that P is already at a character boundary of the same
270 multibyte form whose beginning address is LIMIT. */
271
272 #define PREV_CHAR_BOUNDARY(p, limit) \
273 do { \
274 if ((p) > (limit)) \
275 { \
276 const unsigned char *chp = (p); \
277 do { \
278 chp--; \
279 } while (chp >= limit && ! CHAR_HEAD_P (*chp)); \
280 (p) = (BYTES_BY_CHAR_HEAD (*chp) == (p) - chp) ? chp : (p) - 1; \
281 } \
282 } while (false)
283
284 /* Return the character code of character whose multibyte form is at
285 P. Note that this macro unifies CJK characters whose codepoints
286 are in the Private Use Areas (PUAs), so it might return a different
287 codepoint from the one actually stored at P. */
288
289 #define STRING_CHAR(p) \
290 (!((p)[0] & 0x80) \
291 ? (p)[0] \
292 : ! ((p)[0] & 0x20) \
293 ? (((((p)[0] & 0x1F) << 6) \
294 | ((p)[1] & 0x3F)) \
295 + (((unsigned char) (p)[0]) < 0xC2 ? 0x3FFF80 : 0)) \
296 : ! ((p)[0] & 0x10) \
297 ? ((((p)[0] & 0x0F) << 12) \
298 | (((p)[1] & 0x3F) << 6) \
299 | ((p)[2] & 0x3F)) \
300 : string_char ((p), NULL, NULL))
301
302
303 /* Like STRING_CHAR, but set ACTUAL_LEN to the length of multibyte
304 form.
305
306 Note: This macro returns the actual length of the character's
307 multibyte sequence as it is stored in a buffer or string. The
308 character it returns might have a different codepoint that has a
309 different multibyte sequence of a different length, due to possible
310 unification of CJK characters inside string_char. Therefore do NOT
311 assume that the length returned by this macro is identical to the
312 length of the multibyte sequence of the character it returns. */
313
314 #define STRING_CHAR_AND_LENGTH(p, actual_len) \
315 (!((p)[0] & 0x80) \
316 ? ((actual_len) = 1, (p)[0]) \
317 : ! ((p)[0] & 0x20) \
318 ? ((actual_len) = 2, \
319 (((((p)[0] & 0x1F) << 6) \
320 | ((p)[1] & 0x3F)) \
321 + (((unsigned char) (p)[0]) < 0xC2 ? 0x3FFF80 : 0))) \
322 : ! ((p)[0] & 0x10) \
323 ? ((actual_len) = 3, \
324 ((((p)[0] & 0x0F) << 12) \
325 | (((p)[1] & 0x3F) << 6) \
326 | ((p)[2] & 0x3F))) \
327 : string_char ((p), NULL, &actual_len))
328
329
330 /* Like STRING_CHAR, but advance P to the end of multibyte form. */
331
332 #define STRING_CHAR_ADVANCE(p) \
333 (!((p)[0] & 0x80) \
334 ? *(p)++ \
335 : ! ((p)[0] & 0x20) \
336 ? ((p) += 2, \
337 ((((p)[-2] & 0x1F) << 6) \
338 | ((p)[-1] & 0x3F) \
339 | ((unsigned char) ((p)[-2]) < 0xC2 ? 0x3FFF80 : 0))) \
340 : ! ((p)[0] & 0x10) \
341 ? ((p) += 3, \
342 ((((p)[-3] & 0x0F) << 12) \
343 | (((p)[-2] & 0x3F) << 6) \
344 | ((p)[-1] & 0x3F))) \
345 : string_char ((p), &(p), NULL))
346
347
348 /* Fetch the "next" character from Lisp string STRING at byte position
349 BYTEIDX, character position CHARIDX. Store it into OUTPUT.
350
351 All the args must be side-effect-free.
352 BYTEIDX and CHARIDX must be lvalues;
353 we increment them past the character fetched. */
354
355 #define FETCH_STRING_CHAR_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX) \
356 do \
357 { \
358 CHARIDX++; \
359 if (STRING_MULTIBYTE (STRING)) \
360 { \
361 unsigned char *chp = &SDATA (STRING)[BYTEIDX]; \
362 int chlen; \
363 \
364 OUTPUT = STRING_CHAR_AND_LENGTH (chp, chlen); \
365 BYTEIDX += chlen; \
366 } \
367 else \
368 { \
369 OUTPUT = SREF (STRING, BYTEIDX); \
370 BYTEIDX++; \
371 } \
372 } \
373 while (false)
374
375 /* Like FETCH_STRING_CHAR_ADVANCE, but return a multibyte character
376 even if STRING is unibyte. */
377
378 #define FETCH_STRING_CHAR_AS_MULTIBYTE_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX) \
379 do \
380 { \
381 CHARIDX++; \
382 if (STRING_MULTIBYTE (STRING)) \
383 { \
384 unsigned char *chp = &SDATA (STRING)[BYTEIDX]; \
385 int chlen; \
386 \
387 OUTPUT = STRING_CHAR_AND_LENGTH (chp, chlen); \
388 BYTEIDX += chlen; \
389 } \
390 else \
391 { \
392 OUTPUT = SREF (STRING, BYTEIDX); \
393 BYTEIDX++; \
394 MAKE_CHAR_MULTIBYTE (OUTPUT); \
395 } \
396 } \
397 while (false)
398
399
400 /* Like FETCH_STRING_CHAR_ADVANCE, but assumes STRING is multibyte. */
401
402 #define FETCH_STRING_CHAR_ADVANCE_NO_CHECK(OUTPUT, STRING, CHARIDX, BYTEIDX) \
403 do \
404 { \
405 unsigned char *fetch_ptr = &SDATA (STRING)[BYTEIDX]; \
406 int fetch_len; \
407 \
408 OUTPUT = STRING_CHAR_AND_LENGTH (fetch_ptr, fetch_len); \
409 BYTEIDX += fetch_len; \
410 CHARIDX++; \
411 } \
412 while (false)
413
414
415 /* Like FETCH_STRING_CHAR_ADVANCE, but fetch character from the current
416 buffer. */
417
418 #define FETCH_CHAR_ADVANCE(OUTPUT, CHARIDX, BYTEIDX) \
419 do \
420 { \
421 CHARIDX++; \
422 if (!NILP (BVAR (current_buffer, enable_multibyte_characters))) \
423 { \
424 unsigned char *chp = BYTE_POS_ADDR (BYTEIDX); \
425 int chlen; \
426 \
427 OUTPUT = STRING_CHAR_AND_LENGTH (chp, chlen); \
428 BYTEIDX += chlen; \
429 } \
430 else \
431 { \
432 OUTPUT = *(BYTE_POS_ADDR (BYTEIDX)); \
433 BYTEIDX++; \
434 } \
435 } \
436 while (false)
437
438
439 /* Like FETCH_CHAR_ADVANCE, but assumes the current buffer is multibyte. */
440
441 #define FETCH_CHAR_ADVANCE_NO_CHECK(OUTPUT, CHARIDX, BYTEIDX) \
442 do \
443 { \
444 unsigned char *chp = BYTE_POS_ADDR (BYTEIDX); \
445 int chlen; \
446 \
447 OUTPUT = STRING_CHAR_AND_LENGTH (chp, chlen); \
448 BYTEIDX += chlen; \
449 CHARIDX++; \
450 } \
451 while (false)
452
453
454 /* Increment the buffer byte position POS_BYTE of the current buffer to
455 the next character boundary. No range checking of POS. */
456
457 #define INC_POS(pos_byte) \
458 do { \
459 unsigned char *chp = BYTE_POS_ADDR (pos_byte); \
460 pos_byte += BYTES_BY_CHAR_HEAD (*chp); \
461 } while (false)
462
463
464 /* Decrement the buffer byte position POS_BYTE of the current buffer to
465 the previous character boundary. No range checking of POS. */
466
467 #define DEC_POS(pos_byte) \
468 do { \
469 unsigned char *chp; \
470 \
471 pos_byte--; \
472 if (pos_byte < GPT_BYTE) \
473 chp = BEG_ADDR + pos_byte - BEG_BYTE; \
474 else \
475 chp = BEG_ADDR + GAP_SIZE + pos_byte - BEG_BYTE; \
476 while (!CHAR_HEAD_P (*chp)) \
477 { \
478 chp--; \
479 pos_byte--; \
480 } \
481 } while (false)
482
483 /* Increment both CHARPOS and BYTEPOS, each in the appropriate way. */
484
485 #define INC_BOTH(charpos, bytepos) \
486 do \
487 { \
488 (charpos)++; \
489 if (NILP (BVAR (current_buffer, enable_multibyte_characters))) \
490 (bytepos)++; \
491 else \
492 INC_POS ((bytepos)); \
493 } \
494 while (false)
495
496
497 /* Decrement both CHARPOS and BYTEPOS, each in the appropriate way. */
498
499 #define DEC_BOTH(charpos, bytepos) \
500 do \
501 { \
502 (charpos)--; \
503 if (NILP (BVAR (current_buffer, enable_multibyte_characters))) \
504 (bytepos)--; \
505 else \
506 DEC_POS ((bytepos)); \
507 } \
508 while (false)
509
510
511 /* Increment the buffer byte position POS_BYTE of the current buffer to
512 the next character boundary. This macro relies on the fact that
513 *GPT_ADDR and *Z_ADDR are always accessible and the values are
514 '\0'. No range checking of POS_BYTE. */
515
516 #define BUF_INC_POS(buf, pos_byte) \
517 do { \
518 unsigned char *chp = BUF_BYTE_ADDRESS (buf, pos_byte); \
519 pos_byte += BYTES_BY_CHAR_HEAD (*chp); \
520 } while (false)
521
522
523 /* Decrement the buffer byte position POS_BYTE of the current buffer to
524 the previous character boundary. No range checking of POS_BYTE. */
525
526 #define BUF_DEC_POS(buf, pos_byte) \
527 do { \
528 unsigned char *chp; \
529 pos_byte--; \
530 if (pos_byte < BUF_GPT_BYTE (buf)) \
531 chp = BUF_BEG_ADDR (buf) + pos_byte - BEG_BYTE; \
532 else \
533 chp = BUF_BEG_ADDR (buf) + BUF_GAP_SIZE (buf) + pos_byte - BEG_BYTE;\
534 while (!CHAR_HEAD_P (*chp)) \
535 { \
536 chp--; \
537 pos_byte--; \
538 } \
539 } while (false)
540
541
542 /* Return a non-outlandish value for the tab width. */
543
544 #define SANE_TAB_WIDTH(buf) \
545 sanitize_tab_width (XFASTINT (BVAR (buf, tab_width)))
546 INLINE int
547 sanitize_tab_width (EMACS_INT width)
548 {
549 return 0 < width && width <= 1000 ? width : 8;
550 }
551
552 /* Return the width of ASCII character C. The width is measured by
553 how many columns C will occupy on the screen when displayed in the
554 current buffer. */
555
556 #define ASCII_CHAR_WIDTH(c) \
557 (c < 0x20 \
558 ? (c == '\t' \
559 ? SANE_TAB_WIDTH (current_buffer) \
560 : (c == '\n' ? 0 : (NILP (BVAR (current_buffer, ctl_arrow)) ? 4 : 2))) \
561 : (c < 0x7f \
562 ? 1 \
563 : ((NILP (BVAR (current_buffer, ctl_arrow)) ? 4 : 2))))
564
565 /* Return a non-outlandish value for a character width. */
566
567 INLINE int
568 sanitize_char_width (EMACS_INT width)
569 {
570 return 0 <= width && width <= 1000 ? width : 1000;
571 }
572
573 /* Return the width of character C. The width is measured by how many
574 columns C will occupy on the screen when displayed in the current
575 buffer. */
576
577 #define CHAR_WIDTH(c) \
578 (ASCII_CHAR_P (c) \
579 ? ASCII_CHAR_WIDTH (c) \
580 : sanitize_char_width (XINT (CHAR_TABLE_REF (Vchar_width_table, c))))
581
582 /* If C is a variation selector, return the index of the
583 variation selector (1..256). Otherwise, return 0. */
584
585 #define CHAR_VARIATION_SELECTOR_P(c) \
586 ((c) < 0xFE00 ? 0 \
587 : (c) <= 0xFE0F ? (c) - 0xFE00 + 1 \
588 : (c) < 0xE0100 ? 0 \
589 : (c) <= 0xE01EF ? (c) - 0xE0100 + 17 \
590 : 0)
591
592 /* If C is a high surrogate, return 1. If C is a low surrogate,
593 return 2. Otherwise, return 0. */
594
595 #define CHAR_SURROGATE_PAIR_P(c) \
596 ((c) < 0xD800 ? 0 \
597 : (c) <= 0xDBFF ? 1 \
598 : (c) <= 0xDFFF ? 2 \
599 : 0)
600
601 /* Data type for Unicode general category.
602
603 The order of members must be in sync with the 8th element of the
604 member of unidata-prop-alist (in admin/unidata/unidata-gen.el) for
605 Unicode character property `general-category'. */
606
607 typedef enum {
608 UNICODE_CATEGORY_UNKNOWN = 0,
609 UNICODE_CATEGORY_Lu,
610 UNICODE_CATEGORY_Ll,
611 UNICODE_CATEGORY_Lt,
612 UNICODE_CATEGORY_Lm,
613 UNICODE_CATEGORY_Lo,
614 UNICODE_CATEGORY_Mn,
615 UNICODE_CATEGORY_Mc,
616 UNICODE_CATEGORY_Me,
617 UNICODE_CATEGORY_Nd,
618 UNICODE_CATEGORY_Nl,
619 UNICODE_CATEGORY_No,
620 UNICODE_CATEGORY_Pc,
621 UNICODE_CATEGORY_Pd,
622 UNICODE_CATEGORY_Ps,
623 UNICODE_CATEGORY_Pe,
624 UNICODE_CATEGORY_Pi,
625 UNICODE_CATEGORY_Pf,
626 UNICODE_CATEGORY_Po,
627 UNICODE_CATEGORY_Sm,
628 UNICODE_CATEGORY_Sc,
629 UNICODE_CATEGORY_Sk,
630 UNICODE_CATEGORY_So,
631 UNICODE_CATEGORY_Zs,
632 UNICODE_CATEGORY_Zl,
633 UNICODE_CATEGORY_Zp,
634 UNICODE_CATEGORY_Cc,
635 UNICODE_CATEGORY_Cf,
636 UNICODE_CATEGORY_Cs,
637 UNICODE_CATEGORY_Co,
638 UNICODE_CATEGORY_Cn
639 } unicode_category_t;
640
641 extern EMACS_INT char_resolve_modifier_mask (EMACS_INT) ATTRIBUTE_CONST;
642 extern int char_string (unsigned, unsigned char *);
643 extern int string_char (const unsigned char *,
644 const unsigned char **, int *);
645
646 extern int translate_char (Lisp_Object, int c);
647 extern ptrdiff_t count_size_as_multibyte (const unsigned char *, ptrdiff_t);
648 extern ptrdiff_t str_as_multibyte (unsigned char *, ptrdiff_t, ptrdiff_t,
649 ptrdiff_t *);
650 extern ptrdiff_t str_to_multibyte (unsigned char *, ptrdiff_t, ptrdiff_t);
651 extern ptrdiff_t str_as_unibyte (unsigned char *, ptrdiff_t);
652 extern ptrdiff_t str_to_unibyte (const unsigned char *, unsigned char *,
653 ptrdiff_t);
654 extern ptrdiff_t strwidth (const char *, ptrdiff_t);
655 extern ptrdiff_t c_string_width (const unsigned char *, ptrdiff_t, int,
656 ptrdiff_t *, ptrdiff_t *);
657 extern ptrdiff_t lisp_string_width (Lisp_Object, ptrdiff_t,
658 ptrdiff_t *, ptrdiff_t *);
659
660 extern Lisp_Object Qcharacterp;
661 extern Lisp_Object Vchar_unify_table;
662 extern Lisp_Object string_escape_byte8 (Lisp_Object);
663
664 /* Return a translation table of id number ID. */
665 #define GET_TRANSLATION_TABLE(id) \
666 (XCDR (XVECTOR (Vtranslation_table_vector)->contents[(id)]))
667
668 /* Look up the element in char table OBJ at index CH, and return it as
669 an integer. If the element is not a character, return CH itself. */
670
671 INLINE int
672 char_table_translate (Lisp_Object obj, int ch)
673 {
674 /* This internal function is expected to be called with valid arguments,
675 so there is a eassert instead of CHECK_xxx for the sake of speed. */
676 eassert (CHAR_VALID_P (ch));
677 eassert (CHAR_TABLE_P (obj));
678 obj = CHAR_TABLE_REF (obj, ch);
679 return CHARACTERP (obj) ? XINT (obj) : ch;
680 }
681
682 INLINE_HEADER_END
683
684 #endif /* EMACS_CHARACTER_H */
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