1 /* 2 ****************************************************************************** 3 * 4 * Copyright (C) 2000-2010, 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 * @draft ICU 4.2 465 */ 466 #define SHAPE_TAIL_NEW_UNICODE 0x8000000 467 468 /** 469 * Bit mask for new Unicode Tail option 470 * @draft ICU 4.2 471 */ 472 #define SHAPE_TAIL_TYPE_MASK 0x8000000 473 474 #endif 475
