1 /* 2 ******************************************************************************* 3 * Copyright (C) 2010-2014, International Business Machines 4 * Corporation and others. All Rights Reserved. 5 ******************************************************************************* 6 * collation.h 7 * 8 * created on: 2010oct27 9 * created by: Markus W. Scherer 10 */ 11 12 #ifndef __COLLATION_H__ 13 #define __COLLATION_H__ 14 15 #include "unicode/utypes.h" 16 17 #if !UCONFIG_NO_COLLATION 18 19 U_NAMESPACE_BEGIN 20 21 /** 22 * Collation v2 basic definitions and static helper functions. 23 * 24 * Data structures except for expansion tables store 32-bit CEs which are 25 * either specials (see tags below) or are compact forms of 64-bit CEs. 26 */ 27 class U_I18N_API Collation { 28 public: 29 // Special sort key bytes for all levels. 30 static const uint8_t TERMINATOR_BYTE = 0; 31 static const uint8_t LEVEL_SEPARATOR_BYTE = 1; 32 /** 33 * Merge-sort-key separator. 34 * Must not be used as the lead byte of any CE weight, 35 * nor as primary compression low terminator. 36 * Otherwise usable. 37 */ 38 static const uint8_t MERGE_SEPARATOR_BYTE = 2; 39 static const uint32_t MERGE_SEPARATOR_PRIMARY = 0x02000000; // U+FFFE 40 static const uint32_t MERGE_SEPARATOR_WEIGHT16 = 0x0200; // U+FFFE 41 static const uint32_t MERGE_SEPARATOR_LOWER32 = 0x02000200; // U+FFFE 42 static const uint32_t MERGE_SEPARATOR_CE32 = 0x02000202; // U+FFFE 43 44 /** 45 * Primary compression low terminator, must be greater than MERGE_SEPARATOR_BYTE. 46 * Reserved value in primary second byte if the lead byte is compressible. 47 * Otherwise usable in all CE weight bytes. 48 */ 49 static const uint8_t PRIMARY_COMPRESSION_LOW_BYTE = 3; 50 /** 51 * Primary compression high terminator. 52 * Reserved value in primary second byte if the lead byte is compressible. 53 * Otherwise usable in all CE weight bytes. 54 */ 55 static const uint8_t PRIMARY_COMPRESSION_HIGH_BYTE = 0xff; 56 57 /** Default secondary/tertiary weight lead byte. */ 58 static const uint8_t COMMON_BYTE = 5; 59 static const uint32_t COMMON_WEIGHT16 = 0x0500; 60 /** Middle 16 bits of a CE with a common secondary weight. */ 61 static const uint32_t COMMON_SECONDARY_CE = 0x05000000; 62 /** Lower 16 bits of a CE with a common tertiary weight. */ 63 static const uint32_t COMMON_TERTIARY_CE = 0x0500; 64 /** Lower 32 bits of a CE with common secondary and tertiary weights. */ 65 static const uint32_t COMMON_SEC_AND_TER_CE = 0x05000500; 66 67 static const uint32_t SECONDARY_MASK = 0xffff0000; 68 static const uint32_t CASE_MASK = 0xc000; 69 static const uint32_t SECONDARY_AND_CASE_MASK = SECONDARY_MASK | CASE_MASK; 70 /** Only the 2*6 bits for the pure tertiary weight. */ 71 static const uint32_t ONLY_TERTIARY_MASK = 0x3f3f; 72 /** Only the secondary & tertiary bits; no case, no quaternary. */ 73 static const uint32_t ONLY_SEC_TER_MASK = SECONDARY_MASK | ONLY_TERTIARY_MASK; 74 /** Case bits and tertiary bits. */ 75 static const uint32_t CASE_AND_TERTIARY_MASK = CASE_MASK | ONLY_TERTIARY_MASK; 76 static const uint32_t QUATERNARY_MASK = 0xc0; 77 /** Case bits and quaternary bits. */ 78 static const uint32_t CASE_AND_QUATERNARY_MASK = CASE_MASK | QUATERNARY_MASK; 79 80 static const uint8_t UNASSIGNED_IMPLICIT_BYTE = 0xfe; // compressible 81 /** 82 * First unassigned: AlphabeticIndex overflow boundary. 83 * We want a 3-byte primary so that it fits into the root elements table. 84 * 85 * This 3-byte primary will not collide with 86 * any unassigned-implicit 4-byte primaries because 87 * the first few hundred Unicode code points all have real mappings. 88 */ 89 static const uint32_t FIRST_UNASSIGNED_PRIMARY = 0xfe040200; 90 91 static const uint8_t TRAIL_WEIGHT_BYTE = 0xff; // not compressible 92 static const uint32_t FIRST_TRAILING_PRIMARY = 0xff020200; // [first trailing] 93 static const uint32_t MAX_PRIMARY = 0xffff0000; // U+FFFF 94 static const uint32_t MAX_REGULAR_CE32 = 0xffff0505; // U+FFFF 95 96 // CE32 value for U+FFFD as well as illegal UTF-8 byte sequences (which behave like U+FFFD). 97 // We use the third-highest primary weight for U+FFFD (as in UCA 6.3+). 98 static const uint32_t FFFD_PRIMARY = MAX_PRIMARY - 0x20000; 99 static const uint32_t FFFD_CE32 = MAX_REGULAR_CE32 - 0x20000; 100 101 /** 102 * A CE32 is special if its low byte is this or greater. 103 * Impossible case bits 11 mark special CE32s. 104 * This value itself is used to indicate a fallback to the base collator. 105 */ 106 static const uint8_t SPECIAL_CE32_LOW_BYTE = 0xc0; 107 static const uint32_t FALLBACK_CE32 = SPECIAL_CE32_LOW_BYTE; 108 /** 109 * Low byte of a long-primary special CE32. 110 */ 111 static const uint8_t LONG_PRIMARY_CE32_LOW_BYTE = 0xc1; // SPECIAL_CE32_LOW_BYTE | LONG_PRIMARY_TAG 112 113 static const uint32_t UNASSIGNED_CE32 = 0xffffffff; // Compute an unassigned-implicit CE. 114 115 static const uint32_t NO_CE32 = 1; 116 117 /** No CE: End of input. Only used in runtime code, not stored in data. */ 118 static const uint32_t NO_CE_PRIMARY = 1; // not a left-adjusted weight 119 static const uint32_t NO_CE_WEIGHT16 = 0x0100; // weight of LEVEL_SEPARATOR_BYTE 120 static const int64_t NO_CE = INT64_C(0x101000100); // NO_CE_PRIMARY, NO_CE_WEIGHT16, NO_CE_WEIGHT16 121 122 /** Sort key levels. */ 123 enum Level { 124 /** Unspecified level. */ 125 NO_LEVEL, 126 PRIMARY_LEVEL, 127 SECONDARY_LEVEL, 128 CASE_LEVEL, 129 TERTIARY_LEVEL, 130 QUATERNARY_LEVEL, 131 IDENTICAL_LEVEL, 132 /** Beyond sort key bytes. */ 133 ZERO_LEVEL 134 }; 135 136 /** 137 * Sort key level flags: xx_FLAG = 1 << xx_LEVEL. 138 * In Java, use enum Level with flag() getters, or use EnumSet rather than hand-made bit sets. 139 */ 140 static const uint32_t NO_LEVEL_FLAG = 1; 141 static const uint32_t PRIMARY_LEVEL_FLAG = 2; 142 static const uint32_t SECONDARY_LEVEL_FLAG = 4; 143 static const uint32_t CASE_LEVEL_FLAG = 8; 144 static const uint32_t TERTIARY_LEVEL_FLAG = 0x10; 145 static const uint32_t QUATERNARY_LEVEL_FLAG = 0x20; 146 static const uint32_t IDENTICAL_LEVEL_FLAG = 0x40; 147 static const uint32_t ZERO_LEVEL_FLAG = 0x80; 148 149 /** 150 * Special-CE32 tags, from bits 3..0 of a special 32-bit CE. 151 * Bits 31..8 are available for tag-specific data. 152 * Bits 5..4: Reserved. May be used in the future to indicate lccc!=0 and tccc!=0. 153 */ 154 enum { 155 /** 156 * Fall back to the base collator. 157 * This is the tag value in SPECIAL_CE32_LOW_BYTE and FALLBACK_CE32. 158 * Bits 31..8: Unused, 0. 159 */ 160 FALLBACK_TAG = 0, 161 /** 162 * Long-primary CE with COMMON_SEC_AND_TER_CE. 163 * Bits 31..8: Three-byte primary. 164 */ 165 LONG_PRIMARY_TAG = 1, 166 /** 167 * Long-secondary CE with zero primary. 168 * Bits 31..16: Secondary weight. 169 * Bits 15.. 8: Tertiary weight. 170 */ 171 LONG_SECONDARY_TAG = 2, 172 /** 173 * Unused. 174 * May be used in the future for single-byte secondary CEs (SHORT_SECONDARY_TAG), 175 * storing the secondary in bits 31..24, the ccc in bits 23..16, 176 * and the tertiary in bits 15..8. 177 */ 178 RESERVED_TAG_3 = 3, 179 /** 180 * Latin mini expansions of two simple CEs [pp, 05, tt] [00, ss, 05]. 181 * Bits 31..24: Single-byte primary weight pp of the first CE. 182 * Bits 23..16: Tertiary weight tt of the first CE. 183 * Bits 15.. 8: Secondary weight ss of the second CE. 184 */ 185 LATIN_EXPANSION_TAG = 4, 186 /** 187 * Points to one or more simple/long-primary/long-secondary 32-bit CE32s. 188 * Bits 31..13: Index into uint32_t table. 189 * Bits 12.. 8: Length=1..31. 190 */ 191 EXPANSION32_TAG = 5, 192 /** 193 * Points to one or more 64-bit CEs. 194 * Bits 31..13: Index into CE table. 195 * Bits 12.. 8: Length=1..31. 196 */ 197 EXPANSION_TAG = 6, 198 /** 199 * Builder data, used only in the CollationDataBuilder, not in runtime data. 200 * 201 * If bit 8 is 0: Builder context, points to a list of context-sensitive mappings. 202 * Bits 31..13: Index to the builder's list of ConditionalCE32 for this character. 203 * Bits 12.. 9: Unused, 0. 204 * 205 * If bit 8 is 1 (IS_BUILDER_JAMO_CE32): Builder-only jamoCE32 value. 206 * The builder fetches the Jamo CE32 from the trie. 207 * Bits 31..13: Jamo code point. 208 * Bits 12.. 9: Unused, 0. 209 */ 210 BUILDER_DATA_TAG = 7, 211 /** 212 * Points to prefix trie. 213 * Bits 31..13: Index into prefix/contraction data. 214 * Bits 12.. 8: Unused, 0. 215 */ 216 PREFIX_TAG = 8, 217 /** 218 * Points to contraction data. 219 * Bits 31..13: Index into prefix/contraction data. 220 * Bits 12..11: Unused, 0. 221 * Bit 10: CONTRACT_TRAILING_CCC flag. 222 * Bit 9: CONTRACT_NEXT_CCC flag. 223 * Bit 8: CONTRACT_SINGLE_CP_NO_MATCH flag. 224 */ 225 CONTRACTION_TAG = 9, 226 /** 227 * Decimal digit. 228 * Bits 31..13: Index into uint32_t table for non-numeric-collation CE32. 229 * Bit 12: Unused, 0. 230 * Bits 11.. 8: Digit value 0..9. 231 */ 232 DIGIT_TAG = 10, 233 /** 234 * Tag for U+0000, for moving the NUL-termination handling 235 * from the regular fastpath into specials-handling code. 236 * Bits 31..8: Unused, 0. 237 */ 238 U0000_TAG = 11, 239 /** 240 * Tag for a Hangul syllable. 241 * Bits 31..9: Unused, 0. 242 * Bit 8: HANGUL_NO_SPECIAL_JAMO flag. 243 */ 244 HANGUL_TAG = 12, 245 /** 246 * Tag for a lead surrogate code unit. 247 * Optional optimization for UTF-16 string processing. 248 * Bits 31..10: Unused, 0. 249 * 9.. 8: =0: All associated supplementary code points are unassigned-implict. 250 * =1: All associated supplementary code points fall back to the base data. 251 * else: (Normally 2) Look up the data for the supplementary code point. 252 */ 253 LEAD_SURROGATE_TAG = 13, 254 /** 255 * Tag for CEs with primary weights in code point order. 256 * Bits 31..13: Index into CE table, for one data "CE". 257 * Bits 12.. 8: Unused, 0. 258 * 259 * This data "CE" has the following bit fields: 260 * Bits 63..32: Three-byte primary pppppp00. 261 * 31.. 8: Start/base code point of the in-order range. 262 * 7: Flag isCompressible primary. 263 * 6.. 0: Per-code point primary-weight increment. 264 */ 265 OFFSET_TAG = 14, 266 /** 267 * Implicit CE tag. Compute an unassigned-implicit CE. 268 * All bits are set (UNASSIGNED_CE32=0xffffffff). 269 */ 270 IMPLICIT_TAG = 15 271 }; 272 273 static UBool isAssignedCE32(uint32_t ce32) { 274 return ce32 != FALLBACK_CE32 && ce32 != UNASSIGNED_CE32; 275 } 276 277 /** 278 * We limit the number of CEs in an expansion 279 * so that we can use a small number of length bits in the data structure, 280 * and so that an implementation can copy CEs at runtime without growing a destination buffer. 281 */ 282 static const int32_t MAX_EXPANSION_LENGTH = 31; 283 static const int32_t MAX_INDEX = 0x7ffff; 284 285 /** 286 * Set if there is no match for the single (no-suffix) character itself. 287 * This is only possible if there is a prefix. 288 * In this case, discontiguous contraction matching cannot add combining marks 289 * starting from an empty suffix. 290 * The default CE32 is used anyway if there is no suffix match. 291 */ 292 static const uint32_t CONTRACT_SINGLE_CP_NO_MATCH = 0x100; 293 /** Set if the first character of every contraction suffix has lccc!=0. */ 294 static const uint32_t CONTRACT_NEXT_CCC = 0x200; 295 /** Set if any contraction suffix ends with lccc!=0. */ 296 static const uint32_t CONTRACT_TRAILING_CCC = 0x400; 297 298 /** For HANGUL_TAG: None of its Jamo CE32s isSpecialCE32(). */ 299 static const uint32_t HANGUL_NO_SPECIAL_JAMO = 0x100; 300 301 static const uint32_t LEAD_ALL_UNASSIGNED = 0; 302 static const uint32_t LEAD_ALL_FALLBACK = 0x100; 303 static const uint32_t LEAD_MIXED = 0x200; 304 static const uint32_t LEAD_TYPE_MASK = 0x300; 305 306 static uint32_t makeLongPrimaryCE32(uint32_t p) { return p | LONG_PRIMARY_CE32_LOW_BYTE; } 307 308 /** Turns the long-primary CE32 into a primary weight pppppp00. */ 309 static inline uint32_t primaryFromLongPrimaryCE32(uint32_t ce32) { 310 return ce32 & 0xffffff00; 311 } 312 static inline int64_t ceFromLongPrimaryCE32(uint32_t ce32) { 313 return ((int64_t)(ce32 & 0xffffff00) << 32) | COMMON_SEC_AND_TER_CE; 314 } 315 316 static uint32_t makeLongSecondaryCE32(uint32_t lower32) { 317 return lower32 | SPECIAL_CE32_LOW_BYTE | LONG_SECONDARY_TAG; 318 } 319 static inline int64_t ceFromLongSecondaryCE32(uint32_t ce32) { 320 return ce32 & 0xffffff00; 321 } 322 323 /** Makes a special CE32 with tag, index and length. */ 324 static uint32_t makeCE32FromTagIndexAndLength(int32_t tag, int32_t index, int32_t length) { 325 return (index << 13) | (length << 8) | SPECIAL_CE32_LOW_BYTE | tag; 326 } 327 /** Makes a special CE32 with only tag and index. */ 328 static uint32_t makeCE32FromTagAndIndex(int32_t tag, int32_t index) { 329 return (index << 13) | SPECIAL_CE32_LOW_BYTE | tag; 330 } 331 332 static inline UBool isSpecialCE32(uint32_t ce32) { 333 return (ce32 & 0xff) >= SPECIAL_CE32_LOW_BYTE; 334 } 335 336 static inline int32_t tagFromCE32(uint32_t ce32) { 337 return (int32_t)(ce32 & 0xf); 338 } 339 340 static inline UBool hasCE32Tag(uint32_t ce32, int32_t tag) { 341 return isSpecialCE32(ce32) && tagFromCE32(ce32) == tag; 342 } 343 344 static inline UBool isLongPrimaryCE32(uint32_t ce32) { 345 return hasCE32Tag(ce32, LONG_PRIMARY_TAG); 346 } 347 348 static UBool isSimpleOrLongCE32(uint32_t ce32) { 349 return !isSpecialCE32(ce32) || 350 tagFromCE32(ce32) == LONG_PRIMARY_TAG || 351 tagFromCE32(ce32) == LONG_SECONDARY_TAG; 352 } 353 354 /** 355 * @return TRUE if the ce32 yields one or more CEs without further data lookups 356 */ 357 static UBool isSelfContainedCE32(uint32_t ce32) { 358 return !isSpecialCE32(ce32) || 359 tagFromCE32(ce32) == LONG_PRIMARY_TAG || 360 tagFromCE32(ce32) == LONG_SECONDARY_TAG || 361 tagFromCE32(ce32) == LATIN_EXPANSION_TAG; 362 } 363 364 static inline UBool isPrefixCE32(uint32_t ce32) { 365 return hasCE32Tag(ce32, PREFIX_TAG); 366 } 367 368 static inline UBool isContractionCE32(uint32_t ce32) { 369 return hasCE32Tag(ce32, CONTRACTION_TAG); 370 } 371 372 static inline UBool ce32HasContext(uint32_t ce32) { 373 return isSpecialCE32(ce32) && 374 (tagFromCE32(ce32) == PREFIX_TAG || 375 tagFromCE32(ce32) == CONTRACTION_TAG); 376 } 377 378 /** 379 * Get the first of the two Latin-expansion CEs encoded in ce32. 380 * @see LATIN_EXPANSION_TAG 381 */ 382 static inline int64_t latinCE0FromCE32(uint32_t ce32) { 383 return ((int64_t)(ce32 & 0xff000000) << 32) | COMMON_SECONDARY_CE | ((ce32 & 0xff0000) >> 8); 384 } 385 386 /** 387 * Get the second of the two Latin-expansion CEs encoded in ce32. 388 * @see LATIN_EXPANSION_TAG 389 */ 390 static inline int64_t latinCE1FromCE32(uint32_t ce32) { 391 return ((ce32 & 0xff00) << 16) | COMMON_TERTIARY_CE; 392 } 393 394 /** 395 * Returns the data index from a special CE32. 396 */ 397 static inline int32_t indexFromCE32(uint32_t ce32) { 398 return (int32_t)(ce32 >> 13); 399 } 400 401 /** 402 * Returns the data length from a ce32. 403 */ 404 static inline int32_t lengthFromCE32(uint32_t ce32) { 405 return (ce32 >> 8) & 31; 406 } 407 408 /** 409 * Returns the digit value from a DIGIT_TAG ce32. 410 */ 411 static inline char digitFromCE32(uint32_t ce32) { 412 return (char)((ce32 >> 8) & 0xf); 413 } 414 415 /** Returns a 64-bit CE from a simple CE32 (not special). */ 416 static inline int64_t ceFromSimpleCE32(uint32_t ce32) { 417 // normal form ppppsstt -> pppp0000ss00tt00 418 // assert (ce32 & 0xff) < SPECIAL_CE32_LOW_BYTE 419 return ((int64_t)(ce32 & 0xffff0000) << 32) | ((ce32 & 0xff00) << 16) | ((ce32 & 0xff) << 8); 420 } 421 422 /** Returns a 64-bit CE from a simple/long-primary/long-secondary CE32. */ 423 static inline int64_t ceFromCE32(uint32_t ce32) { 424 uint32_t tertiary = ce32 & 0xff; 425 if(tertiary < SPECIAL_CE32_LOW_BYTE) { 426 // normal form ppppsstt -> pppp0000ss00tt00 427 return ((int64_t)(ce32 & 0xffff0000) << 32) | ((ce32 & 0xff00) << 16) | (tertiary << 8); 428 } else { 429 ce32 -= tertiary; 430 if((tertiary & 0xf) == LONG_PRIMARY_TAG) { 431 // long-primary form ppppppC1 -> pppppp00050000500 432 return ((int64_t)ce32 << 32) | COMMON_SEC_AND_TER_CE; 433 } else { 434 // long-secondary form ssssttC2 -> 00000000sssstt00 435 // assert (tertiary & 0xf) == LONG_SECONDARY_TAG 436 return ce32; 437 } 438 } 439 } 440 441 /** Creates a CE from a primary weight. */ 442 static inline int64_t makeCE(uint32_t p) { 443 return ((int64_t)p << 32) | COMMON_SEC_AND_TER_CE; 444 } 445 /** 446 * Creates a CE from a primary weight, 447 * 16-bit secondary/tertiary weights, and a 2-bit quaternary. 448 */ 449 static inline int64_t makeCE(uint32_t p, uint32_t s, uint32_t t, uint32_t q) { 450 return ((int64_t)p << 32) | (s << 16) | t | (q << 6); 451 } 452 453 /** 454 * Increments a 2-byte primary by a code point offset. 455 */ 456 static uint32_t incTwoBytePrimaryByOffset(uint32_t basePrimary, UBool isCompressible, 457 int32_t offset); 458 459 /** 460 * Increments a 3-byte primary by a code point offset. 461 */ 462 static uint32_t incThreeBytePrimaryByOffset(uint32_t basePrimary, UBool isCompressible, 463 int32_t offset); 464 465 /** 466 * Decrements a 2-byte primary by one range step (1..0x7f). 467 */ 468 static uint32_t decTwoBytePrimaryByOneStep(uint32_t basePrimary, UBool isCompressible, int32_t step); 469 470 /** 471 * Decrements a 3-byte primary by one range step (1..0x7f). 472 */ 473 static uint32_t decThreeBytePrimaryByOneStep(uint32_t basePrimary, UBool isCompressible, int32_t step); 474 475 /** 476 * Computes a 3-byte primary for c's OFFSET_TAG data "CE". 477 */ 478 static uint32_t getThreeBytePrimaryForOffsetData(UChar32 c, int64_t dataCE); 479 480 /** 481 * Returns the unassigned-character implicit primary weight for any valid code point c. 482 */ 483 static uint32_t unassignedPrimaryFromCodePoint(UChar32 c); 484 485 static inline int64_t unassignedCEFromCodePoint(UChar32 c) { 486 return makeCE(unassignedPrimaryFromCodePoint(c)); 487 } 488 489 static inline uint32_t reorder(const uint8_t reorderTable[256], uint32_t primary) { 490 return ((uint32_t)reorderTable[primary >> 24] << 24) | (primary & 0xffffff); 491 } 492 493 private: 494 Collation(); // No instantiation. 495 }; 496 497 U_NAMESPACE_END 498 499 #endif // !UCONFIG_NO_COLLATION 500 #endif // __COLLATION_H__ 501
