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| 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_MAS
K; |
| 74 /** Case bits and tertiary bits. */ |
| 75 static const uint32_t CASE_AND_TERTIARY_MASK = CASE_MASK | ONLY_TERTIARY_MAS
K; |
| 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 traili
ng] |
| 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 beha
ve 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 unassigne
d-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 h
and-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 t
ccc!=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_SECOND
ARY_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 d
ata. |
| 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 unassig
ned-implict. |
| 250 * =1: All associated supplementary code points fall back t
o the base data. |
| 251 * else: (Normally 2) Look up the data for the supplementar
y 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 d
estination 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 mar
ks |
| 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_CE
32_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, in
t32_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 look
ups |
| 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 | ((ce
32 & 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 isComp
ressible, |
| 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 isCo
mpressible, |
| 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 isCom
pressible, 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 isC
ompressible, 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 co
de 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 pri
mary) { |
| 490 return ((uint32_t)reorderTable[primary >> 24] << 24) | (primary & 0xffff
ff); |
| 491 } |
| 492 |
| 493 private: |
| 494 Collation(); // No instantiation. |
| 495 }; |
| 496 |
| 497 U_NAMESPACE_END |
| 498 |
| 499 #endif // !UCONFIG_NO_COLLATION |
| 500 #endif // __COLLATION_H__ |
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