The Tor Browser / file comparison

comparison: intl/icu/source/common/unicode/ushape.h

intl/icu/source/common/unicode/ushape.h

changeset 0
6474c204b198
equal deleted inserted replaced
-1:000000000000 0:78e847388d9d
1 /*
2 ******************************************************************************
3 *
4 * Copyright (C) 2000-2012, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 ******************************************************************************
8 * file name: ushape.h
9 * encoding: US-ASCII
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2000jun29
14 * created by: Markus W. Scherer
15 */
16
17 #ifndef __USHAPE_H__
18 #define __USHAPE_H__
19
20 #include "unicode/utypes.h"
21
22 /**
23 * \file
24 * \brief C API: Arabic shaping
25 *
26 */
27
28 /**
29 * Shape Arabic text on a character basis.
30 *
31 * <p>This function performs basic operations for "shaping" Arabic text. It is most
32 * useful for use with legacy data formats and legacy display technology
33 * (simple terminals). All operations are performed on Unicode characters.</p>
34 *
35 * <p>Text-based shaping means that some character code points in the text are
36 * replaced by others depending on the context. It transforms one kind of text
37 * into another. In comparison, modern displays for Arabic text select
38 * appropriate, context-dependent font glyphs for each text element, which means
39 * that they transform text into a glyph vector.</p>
40 *
41 * <p>Text transformations are necessary when modern display technology is not
42 * available or when text needs to be transformed to or from legacy formats that
43 * use "shaped" characters. Since the Arabic script is cursive, connecting
44 * adjacent letters to each other, computers select images for each letter based
45 * on the surrounding letters. This usually results in four images per Arabic
46 * letter: initial, middle, final, and isolated forms. In Unicode, on the other
47 * hand, letters are normally stored abstract, and a display system is expected
48 * to select the necessary glyphs. (This makes searching and other text
49 * processing easier because the same letter has only one code.) It is possible
50 * to mimic this with text transformations because there are characters in
51 * Unicode that are rendered as letters with a specific shape
52 * (or cursive connectivity). They were included for interoperability with
53 * legacy systems and codepages, and for unsophisticated display systems.</p>
54 *
55 * <p>A second kind of text transformations is supported for Arabic digits:
56 * For compatibility with legacy codepages that only include European digits,
57 * it is possible to replace one set of digits by another, changing the
58 * character code points. These operations can be performed for either
59 * Arabic-Indic Digits (U+0660...U+0669) or Eastern (Extended) Arabic-Indic
60 * digits (U+06f0...U+06f9).</p>
61 *
62 * <p>Some replacements may result in more or fewer characters (code points).
63 * By default, this means that the destination buffer may receive text with a
64 * length different from the source length. Some legacy systems rely on the
65 * length of the text to be constant. They expect extra spaces to be added
66 * or consumed either next to the affected character or at the end of the
67 * text.</p>
68 *
69 * <p>For details about the available operations, see the description of the
70 * <code>U_SHAPE_...</code> options.</p>
71 *
72 * @param source The input text.
73 *
74 * @param sourceLength The number of UChars in <code>source</code>.
75 *
76 * @param dest The destination buffer that will receive the results of the
77 * requested operations. It may be <code>NULL</code> only if
78 * <code>destSize</code> is 0. The source and destination must not
79 * overlap.
80 *
81 * @param destSize The size (capacity) of the destination buffer in UChars.
82 * If <code>destSize</code> is 0, then no output is produced,
83 * but the necessary buffer size is returned ("preflighting").
84 *
85 * @param options This is a 32-bit set of flags that specify the operations
86 * that are performed on the input text. If no error occurs,
87 * then the result will always be written to the destination
88 * buffer.
89 *
90 * @param pErrorCode must be a valid pointer to an error code value,
91 * which must not indicate a failure before the function call.
92 *
93 * @return The number of UChars written to the destination buffer.
94 * If an error occured, then no output was written, or it may be
95 * incomplete. If <code>U_BUFFER_OVERFLOW_ERROR</code> is set, then
96 * the return value indicates the necessary destination buffer size.
97 * @stable ICU 2.0
98 */
99 U_STABLE int32_t U_EXPORT2
100 u_shapeArabic(const UChar *source, int32_t sourceLength,
101 UChar *dest, int32_t destSize,
102 uint32_t options,
103 UErrorCode *pErrorCode);
104
105 /**
106 * Memory option: allow the result to have a different length than the source.
107 * Affects: LamAlef options
108 * @stable ICU 2.0
109 */
110 #define U_SHAPE_LENGTH_GROW_SHRINK 0
111
112 /**
113 * Memory option: allow the result to have a different length than the source.
114 * Affects: LamAlef options
115 * This option is an alias to U_SHAPE_LENGTH_GROW_SHRINK
116 * @stable ICU 4.2
117 */
118 #define U_SHAPE_LAMALEF_RESIZE 0
119
120 /**
121 * Memory option: the result must have the same length as the source.
122 * If more room is necessary, then try to consume spaces next to modified characters.
123 * @stable ICU 2.0
124 */
125 #define U_SHAPE_LENGTH_FIXED_SPACES_NEAR 1
126
127 /**
128 * Memory option: the result must have the same length as the source.
129 * If more room is necessary, then try to consume spaces next to modified characters.
130 * Affects: LamAlef options
131 * This option is an alias to U_SHAPE_LENGTH_FIXED_SPACES_NEAR
132 * @stable ICU 4.2
133 */
134 #define U_SHAPE_LAMALEF_NEAR 1
135
136 /**
137 * Memory option: the result must have the same length as the source.
138 * If more room is necessary, then try to consume spaces at the end of the text.
139 * @stable ICU 2.0
140 */
141 #define U_SHAPE_LENGTH_FIXED_SPACES_AT_END 2
142
143 /**
144 * Memory option: the result must have the same length as the source.
145 * If more room is necessary, then try to consume spaces at the end of the text.
146 * Affects: LamAlef options
147 * This option is an alias to U_SHAPE_LENGTH_FIXED_SPACES_AT_END
148 * @stable ICU 4.2
149 */
150 #define U_SHAPE_LAMALEF_END 2
151
152 /**
153 * Memory option: the result must have the same length as the source.
154 * If more room is necessary, then try to consume spaces at the beginning of the text.
155 * @stable ICU 2.0
156 */
157 #define U_SHAPE_LENGTH_FIXED_SPACES_AT_BEGINNING 3
158
159 /**
160 * Memory option: the result must have the same length as the source.
161 * If more room is necessary, then try to consume spaces at the beginning of the text.
162 * Affects: LamAlef options
163 * This option is an alias to U_SHAPE_LENGTH_FIXED_SPACES_AT_BEGINNING
164 * @stable ICU 4.2
165 */
166 #define U_SHAPE_LAMALEF_BEGIN 3
167
168
169 /**
170 * Memory option: the result must have the same length as the source.
171 * Shaping Mode: For each LAMALEF character found, expand LAMALEF using space at end.
172 * If there is no space at end, use spaces at beginning of the buffer. If there
173 * is no space at beginning of the buffer, use spaces at the near (i.e. the space
174 * after the LAMALEF character).
175 * If there are no spaces found, an error U_NO_SPACE_AVAILABLE (as defined in utypes.h)
176 * will be set in pErrorCode
177 *
178 * Deshaping Mode: Perform the same function as the flag equals U_SHAPE_LAMALEF_END.
179 * Affects: LamAlef options
180 * @stable ICU 4.2
181 */
182 #define U_SHAPE_LAMALEF_AUTO 0x10000
183
184 /** Bit mask for memory options. @stable ICU 2.0 */
185 #define U_SHAPE_LENGTH_MASK 0x10003 /* Changed old value 3 */
186
187
188 /**
189 * Bit mask for LamAlef memory options.
190 * @stable ICU 4.2
191 */
192 #define U_SHAPE_LAMALEF_MASK 0x10003 /* updated */
193
194 /** Direction indicator: the source is in logical (keyboard) order. @stable ICU 2.0 */
195 #define U_SHAPE_TEXT_DIRECTION_LOGICAL 0
196
197 /**
198 * Direction indicator:
199 * the source is in visual RTL order,
200 * the rightmost displayed character stored first.
201 * This option is an alias to U_SHAPE_TEXT_DIRECTION_LOGICAL
202 * @stable ICU 4.2
203 */
204 #define U_SHAPE_TEXT_DIRECTION_VISUAL_RTL 0
205
206 /**
207 * Direction indicator:
208 * the source is in visual LTR order,
209 * the leftmost displayed character stored first.
210 * @stable ICU 2.0
211 */
212 #define U_SHAPE_TEXT_DIRECTION_VISUAL_LTR 4
213
214 /** Bit mask for direction indicators. @stable ICU 2.0 */
215 #define U_SHAPE_TEXT_DIRECTION_MASK 4
216
217
218 /** Letter shaping option: do not perform letter shaping. @stable ICU 2.0 */
219 #define U_SHAPE_LETTERS_NOOP 0
220
221 /** Letter shaping option: replace abstract letter characters by "shaped" ones. @stable ICU 2.0 */
222 #define U_SHAPE_LETTERS_SHAPE 8
223
224 /** Letter shaping option: replace "shaped" letter characters by abstract ones. @stable ICU 2.0 */
225 #define U_SHAPE_LETTERS_UNSHAPE 0x10
226
227 /**
228 * Letter shaping option: replace abstract letter characters by "shaped" ones.
229 * The only difference with U_SHAPE_LETTERS_SHAPE is that Tashkeel letters
230 * are always "shaped" into the isolated form instead of the medial form
231 * (selecting code points from the Arabic Presentation Forms-B block).
232 * @stable ICU 2.0
233 */
234 #define U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED 0x18
235
236
237 /** Bit mask for letter shaping options. @stable ICU 2.0 */
238 #define U_SHAPE_LETTERS_MASK 0x18
239
240
241 /** Digit shaping option: do not perform digit shaping. @stable ICU 2.0 */
242 #define U_SHAPE_DIGITS_NOOP 0
243
244 /**
245 * Digit shaping option:
246 * Replace European digits (U+0030...) by Arabic-Indic digits.
247 * @stable ICU 2.0
248 */
249 #define U_SHAPE_DIGITS_EN2AN 0x20
250
251 /**
252 * Digit shaping option:
253 * Replace Arabic-Indic digits by European digits (U+0030...).
254 * @stable ICU 2.0
255 */
256 #define U_SHAPE_DIGITS_AN2EN 0x40
257
258 /**
259 * Digit shaping option:
260 * Replace European digits (U+0030...) by Arabic-Indic digits if the most recent
261 * strongly directional character is an Arabic letter
262 * (<code>u_charDirection()</code> result <code>U_RIGHT_TO_LEFT_ARABIC</code> [AL]).<br>
263 * The direction of "preceding" depends on the direction indicator option.
264 * For the first characters, the preceding strongly directional character
265 * (initial state) is assumed to be not an Arabic letter
266 * (it is <code>U_LEFT_TO_RIGHT</code> [L] or <code>U_RIGHT_TO_LEFT</code> [R]).
267 * @stable ICU 2.0
268 */
269 #define U_SHAPE_DIGITS_ALEN2AN_INIT_LR 0x60
270
271 /**
272 * Digit shaping option:
273 * Replace European digits (U+0030...) by Arabic-Indic digits if the most recent
274 * strongly directional character is an Arabic letter
275 * (<code>u_charDirection()</code> result <code>U_RIGHT_TO_LEFT_ARABIC</code> [AL]).<br>
276 * The direction of "preceding" depends on the direction indicator option.
277 * For the first characters, the preceding strongly directional character
278 * (initial state) is assumed to be an Arabic letter.
279 * @stable ICU 2.0
280 */
281 #define U_SHAPE_DIGITS_ALEN2AN_INIT_AL 0x80
282
283 /** Not a valid option value. May be replaced by a new option. @stable ICU 2.0 */
284 #define U_SHAPE_DIGITS_RESERVED 0xa0
285
286 /** Bit mask for digit shaping options. @stable ICU 2.0 */
287 #define U_SHAPE_DIGITS_MASK 0xe0
288
289
290 /** Digit type option: Use Arabic-Indic digits (U+0660...U+0669). @stable ICU 2.0 */
291 #define U_SHAPE_DIGIT_TYPE_AN 0
292
293 /** Digit type option: Use Eastern (Extended) Arabic-Indic digits (U+06f0...U+06f9). @stable ICU 2.0 */
294 #define U_SHAPE_DIGIT_TYPE_AN_EXTENDED 0x100
295
296 /** Not a valid option value. May be replaced by a new option. @stable ICU 2.0 */
297 #define U_SHAPE_DIGIT_TYPE_RESERVED 0x200
298
299 /** Bit mask for digit type options. @stable ICU 2.0 */
300 #define U_SHAPE_DIGIT_TYPE_MASK 0x300 /* I need to change this from 0x3f00 to 0x300 */
301
302 /**
303 * Tashkeel aggregation option:
304 * Replaces any combination of U+0651 with one of
305 * U+064C, U+064D, U+064E, U+064F, U+0650 with
306 * U+FC5E, U+FC5F, U+FC60, U+FC61, U+FC62 consecutively.
307 * @stable ICU 3.6
308 */
309 #define U_SHAPE_AGGREGATE_TASHKEEL 0x4000
310 /** Tashkeel aggregation option: do not aggregate tashkeels. @stable ICU 3.6 */
311 #define U_SHAPE_AGGREGATE_TASHKEEL_NOOP 0
312 /** Bit mask for tashkeel aggregation. @stable ICU 3.6 */
313 #define U_SHAPE_AGGREGATE_TASHKEEL_MASK 0x4000
314
315 /**
316 * Presentation form option:
317 * Don't replace Arabic Presentation Forms-A and Arabic Presentation Forms-B
318 * characters with 0+06xx characters, before shaping.
319 * @stable ICU 3.6
320 */
321 #define U_SHAPE_PRESERVE_PRESENTATION 0x8000
322 /** Presentation form option:
323 * Replace Arabic Presentation Forms-A and Arabic Presentationo Forms-B with
324 * their unshaped correspondants in range 0+06xx, before shaping.
325 * @stable ICU 3.6
326 */
327 #define U_SHAPE_PRESERVE_PRESENTATION_NOOP 0
328 /** Bit mask for preserve presentation form. @stable ICU 3.6 */
329 #define U_SHAPE_PRESERVE_PRESENTATION_MASK 0x8000
330
331 /* Seen Tail option */
332 /**
333 * Memory option: the result must have the same length as the source.
334 * Shaping mode: The SEEN family character will expand into two characters using space near
335 * the SEEN family character(i.e. the space after the character).
336 * If there are no spaces found, an error U_NO_SPACE_AVAILABLE (as defined in utypes.h)
337 * will be set in pErrorCode
338 *
339 * De-shaping mode: Any Seen character followed by Tail character will be
340 * replaced by one cell Seen and a space will replace the Tail.
341 * Affects: Seen options
342 * @stable ICU 4.2
343 */
344 #define U_SHAPE_SEEN_TWOCELL_NEAR 0x200000
345
346 /**
347 * Bit mask for Seen memory options.
348 * @stable ICU 4.2
349 */
350 #define U_SHAPE_SEEN_MASK 0x700000
351
352 /* YehHamza option */
353 /**
354 * Memory option: the result must have the same length as the source.
355 * Shaping mode: The YEHHAMZA character will expand into two characters using space near it
356 * (i.e. the space after the character
357 * If there are no spaces found, an error U_NO_SPACE_AVAILABLE (as defined in utypes.h)
358 * will be set in pErrorCode
359 *
360 * De-shaping mode: Any Yeh (final or isolated) character followed by Hamza character will be
361 * replaced by one cell YehHamza and space will replace the Hamza.
362 * Affects: YehHamza options
363 * @stable ICU 4.2
364 */
365 #define U_SHAPE_YEHHAMZA_TWOCELL_NEAR 0x1000000
366
367
368 /**
369 * Bit mask for YehHamza memory options.
370 * @stable ICU 4.2
371 */
372 #define U_SHAPE_YEHHAMZA_MASK 0x3800000
373
374 /* New Tashkeel options */
375 /**
376 * Memory option: the result must have the same length as the source.
377 * Shaping mode: Tashkeel characters will be replaced by spaces.
378 * Spaces will be placed at beginning of the buffer
379 *
380 * De-shaping mode: N/A
381 * Affects: Tashkeel options
382 * @stable ICU 4.2
383 */
384 #define U_SHAPE_TASHKEEL_BEGIN 0x40000
385
386 /**
387 * Memory option: the result must have the same length as the source.
388 * Shaping mode: Tashkeel characters will be replaced by spaces.
389 * Spaces will be placed at end of the buffer
390 *
391 * De-shaping mode: N/A
392 * Affects: Tashkeel options
393 * @stable ICU 4.2
394 */
395 #define U_SHAPE_TASHKEEL_END 0x60000
396
397 /**
398 * Memory option: allow the result to have a different length than the source.
399 * Shaping mode: Tashkeel characters will be removed, buffer length will shrink.
400 * De-shaping mode: N/A
401 *
402 * Affect: Tashkeel options
403 * @stable ICU 4.2
404 */
405 #define U_SHAPE_TASHKEEL_RESIZE 0x80000
406
407 /**
408 * Memory option: the result must have the same length as the source.
409 * Shaping mode: Tashkeel characters will be replaced by Tatweel if it is connected to adjacent
410 * characters (i.e. shaped on Tatweel) or replaced by space if it is not connected.
411 *
412 * De-shaping mode: N/A
413 * Affects: YehHamza options
414 * @stable ICU 4.2
415 */
416 #define U_SHAPE_TASHKEEL_REPLACE_BY_TATWEEL 0xC0000
417
418 /**
419 * Bit mask for Tashkeel replacement with Space or Tatweel memory options.
420 * @stable ICU 4.2
421 */
422 #define U_SHAPE_TASHKEEL_MASK 0xE0000
423
424
425 /* Space location Control options */
426 /**
427 * This option affect the meaning of BEGIN and END options. if this option is not used the default
428 * for BEGIN and END will be as following:
429 * The Default (for both Visual LTR, Visual RTL and Logical Text)
430 * 1. BEGIN always refers to the start address of physical memory.
431 * 2. END always refers to the end address of physical memory.
432 *
433 * If this option is used it will swap the meaning of BEGIN and END only for Visual LTR text.
434 *
435 * The effect on BEGIN and END Memory Options will be as following:
436 * A. BEGIN For Visual LTR text: This will be the beginning (right side) of the visual text(
437 * corresponding to the physical memory address end for Visual LTR text, Same as END in
438 * default behavior)
439 * B. BEGIN For Logical text: Same as BEGIN in default behavior.
440 * C. END For Visual LTR text: This will be the end (left side) of the visual text (corresponding
441 * to the physical memory address beginning for Visual LTR text, Same as BEGIN in default behavior.
442 * D. END For Logical text: Same as END in default behavior).
443 * Affects: All LamAlef BEGIN, END and AUTO options.
444 * @stable ICU 4.2
445 */
446 #define U_SHAPE_SPACES_RELATIVE_TO_TEXT_BEGIN_END 0x4000000
447
448 /**
449 * Bit mask for swapping BEGIN and END for Visual LTR text
450 * @stable ICU 4.2
451 */
452 #define U_SHAPE_SPACES_RELATIVE_TO_TEXT_MASK 0x4000000
453
454 /**
455 * If this option is used, shaping will use the new Unicode code point for TAIL (i.e. 0xFE73).
456 * If this option is not specified (Default), old unofficial Unicode TAIL code point is used (i.e. 0x200B)
457 * De-shaping will not use this option as it will always search for both the new Unicode code point for the
458 * TAIL (i.e. 0xFE73) or the old unofficial Unicode TAIL code point (i.e. 0x200B) and de-shape the
459 * Seen-Family letter accordingly.
460 *
461 * Shaping Mode: Only shaping.
462 * De-shaping Mode: N/A.
463 * Affects: All Seen options
464 * @stable ICU 4.8
465 */
466 #define U_SHAPE_TAIL_NEW_UNICODE 0x8000000
467
468 /**
469 * Bit mask for new Unicode Tail option
470 * @stable ICU 4.8
471 */
472 #define U_SHAPE_TAIL_TYPE_MASK 0x8000000
473
474 #endif

Mercurial Repository: The Tor Browser

Europalab SCM Repository Server

mercurial