| // © 2016 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| /* |
| ******************************************************************************* |
| * Copyright (C) 2012-2015, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ******************************************************************************* |
| * collationkeys.cpp |
| * |
| * created on: 2012sep02 |
| * created by: Markus W. Scherer |
| */ |
| |
| #include "unicode/utypes.h" |
| |
| #if !UCONFIG_NO_COLLATION |
| |
| #if defined(STARBOARD) |
| #include "starboard/client_porting/poem/assert_poem.h" |
| #include "starboard/client_porting/poem/string_poem.h" |
| #endif // defined(STARBOARD) |
| #include "unicode/bytestream.h" |
| #include "collation.h" |
| #include "collationiterator.h" |
| #include "collationkeys.h" |
| #include "collationsettings.h" |
| #include "uassert.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| SortKeyByteSink::~SortKeyByteSink() {} |
| |
| void |
| SortKeyByteSink::Append(const char *bytes, int32_t n) { |
| if (n <= 0 || bytes == NULL) { |
| return; |
| } |
| if (ignore_ > 0) { |
| int32_t ignoreRest = ignore_ - n; |
| if (ignoreRest >= 0) { |
| ignore_ = ignoreRest; |
| return; |
| } else { |
| bytes += ignore_; |
| n = -ignoreRest; |
| ignore_ = 0; |
| } |
| } |
| int32_t length = appended_; |
| appended_ += n; |
| if ((buffer_ + length) == bytes) { |
| return; // the caller used GetAppendBuffer() and wrote the bytes already |
| } |
| int32_t available = capacity_ - length; |
| if (n <= available) { |
| uprv_memcpy(buffer_ + length, bytes, n); |
| } else { |
| AppendBeyondCapacity(bytes, n, length); |
| } |
| } |
| |
| char * |
| SortKeyByteSink::GetAppendBuffer(int32_t min_capacity, |
| int32_t desired_capacity_hint, |
| char *scratch, |
| int32_t scratch_capacity, |
| int32_t *result_capacity) { |
| if (min_capacity < 1 || scratch_capacity < min_capacity) { |
| *result_capacity = 0; |
| return NULL; |
| } |
| if (ignore_ > 0) { |
| // Do not write ignored bytes right at the end of the buffer. |
| *result_capacity = scratch_capacity; |
| return scratch; |
| } |
| int32_t available = capacity_ - appended_; |
| if (available >= min_capacity) { |
| *result_capacity = available; |
| return buffer_ + appended_; |
| } else if (Resize(desired_capacity_hint, appended_)) { |
| *result_capacity = capacity_ - appended_; |
| return buffer_ + appended_; |
| } else { |
| *result_capacity = scratch_capacity; |
| return scratch; |
| } |
| } |
| |
| namespace { |
| |
| /** |
| * uint8_t byte buffer, similar to CharString but simpler. |
| */ |
| class SortKeyLevel : public UMemory { |
| public: |
| SortKeyLevel() : len(0), ok(TRUE) {} |
| ~SortKeyLevel() {} |
| |
| /** @return FALSE if memory allocation failed */ |
| UBool isOk() const { return ok; } |
| UBool isEmpty() const { return len == 0; } |
| int32_t length() const { return len; } |
| const uint8_t *data() const { return buffer.getAlias(); } |
| uint8_t operator[](int32_t index) const { return buffer[index]; } |
| |
| uint8_t *data() { return buffer.getAlias(); } |
| |
| void appendByte(uint32_t b); |
| void appendWeight16(uint32_t w); |
| void appendWeight32(uint32_t w); |
| void appendReverseWeight16(uint32_t w); |
| |
| /** Appends all but the last byte to the sink. The last byte should be the 01 terminator. */ |
| void appendTo(ByteSink &sink) const { |
| U_ASSERT(len > 0 && buffer[len - 1] == 1); |
| sink.Append(reinterpret_cast<const char *>(buffer.getAlias()), len - 1); |
| } |
| |
| private: |
| MaybeStackArray<uint8_t, 40> buffer; |
| int32_t len; |
| UBool ok; |
| |
| UBool ensureCapacity(int32_t appendCapacity); |
| |
| SortKeyLevel(const SortKeyLevel &other); // forbid copying of this class |
| SortKeyLevel &operator=(const SortKeyLevel &other); // forbid copying of this class |
| }; |
| |
| void SortKeyLevel::appendByte(uint32_t b) { |
| if(len < buffer.getCapacity() || ensureCapacity(1)) { |
| buffer[len++] = (uint8_t)b; |
| } |
| } |
| |
| void |
| SortKeyLevel::appendWeight16(uint32_t w) { |
| U_ASSERT((w & 0xffff) != 0); |
| uint8_t b0 = (uint8_t)(w >> 8); |
| uint8_t b1 = (uint8_t)w; |
| int32_t appendLength = (b1 == 0) ? 1 : 2; |
| if((len + appendLength) <= buffer.getCapacity() || ensureCapacity(appendLength)) { |
| buffer[len++] = b0; |
| if(b1 != 0) { |
| buffer[len++] = b1; |
| } |
| } |
| } |
| |
| void |
| SortKeyLevel::appendWeight32(uint32_t w) { |
| U_ASSERT(w != 0); |
| uint8_t bytes[4] = { (uint8_t)(w >> 24), (uint8_t)(w >> 16), (uint8_t)(w >> 8), (uint8_t)w }; |
| int32_t appendLength = (bytes[1] == 0) ? 1 : (bytes[2] == 0) ? 2 : (bytes[3] == 0) ? 3 : 4; |
| if((len + appendLength) <= buffer.getCapacity() || ensureCapacity(appendLength)) { |
| buffer[len++] = bytes[0]; |
| if(bytes[1] != 0) { |
| buffer[len++] = bytes[1]; |
| if(bytes[2] != 0) { |
| buffer[len++] = bytes[2]; |
| if(bytes[3] != 0) { |
| buffer[len++] = bytes[3]; |
| } |
| } |
| } |
| } |
| } |
| |
| void |
| SortKeyLevel::appendReverseWeight16(uint32_t w) { |
| U_ASSERT((w & 0xffff) != 0); |
| uint8_t b0 = (uint8_t)(w >> 8); |
| uint8_t b1 = (uint8_t)w; |
| int32_t appendLength = (b1 == 0) ? 1 : 2; |
| if((len + appendLength) <= buffer.getCapacity() || ensureCapacity(appendLength)) { |
| if(b1 == 0) { |
| buffer[len++] = b0; |
| } else { |
| buffer[len] = b1; |
| buffer[len + 1] = b0; |
| len += 2; |
| } |
| } |
| } |
| |
| UBool SortKeyLevel::ensureCapacity(int32_t appendCapacity) { |
| if(!ok) { |
| return FALSE; |
| } |
| int32_t newCapacity = 2 * buffer.getCapacity(); |
| int32_t altCapacity = len + 2 * appendCapacity; |
| if (newCapacity < altCapacity) { |
| newCapacity = altCapacity; |
| } |
| if (newCapacity < 200) { |
| newCapacity = 200; |
| } |
| if(buffer.resize(newCapacity, len)==NULL) { |
| return ok = FALSE; |
| } |
| return TRUE; |
| } |
| |
| } // namespace |
| |
| CollationKeys::LevelCallback::~LevelCallback() {} |
| |
| UBool |
| CollationKeys::LevelCallback::needToWrite(Collation::Level /*level*/) { return TRUE; } |
| |
| /** |
| * Map from collation strength (UColAttributeValue) |
| * to a mask of Collation::Level bits up to that strength, |
| * excluding the CASE_LEVEL which is independent of the strength, |
| * and excluding IDENTICAL_LEVEL which this function does not write. |
| */ |
| static const uint32_t levelMasks[UCOL_STRENGTH_LIMIT] = { |
| 2, // UCOL_PRIMARY -> PRIMARY_LEVEL |
| 6, // UCOL_SECONDARY -> up to SECONDARY_LEVEL |
| 0x16, // UCOL_TERTIARY -> up to TERTIARY_LEVEL |
| 0x36, // UCOL_QUATERNARY -> up to QUATERNARY_LEVEL |
| 0, 0, 0, 0, |
| 0, 0, 0, 0, |
| 0, 0, 0, |
| 0x36 // UCOL_IDENTICAL -> up to QUATERNARY_LEVEL |
| }; |
| |
| void |
| CollationKeys::writeSortKeyUpToQuaternary(CollationIterator &iter, |
| const UBool *compressibleBytes, |
| const CollationSettings &settings, |
| SortKeyByteSink &sink, |
| Collation::Level minLevel, LevelCallback &callback, |
| UBool preflight, UErrorCode &errorCode) { |
| if(U_FAILURE(errorCode)) { return; } |
| |
| int32_t options = settings.options; |
| // Set of levels to process and write. |
| uint32_t levels = levelMasks[CollationSettings::getStrength(options)]; |
| if((options & CollationSettings::CASE_LEVEL) != 0) { |
| levels |= Collation::CASE_LEVEL_FLAG; |
| } |
| // Minus the levels below minLevel. |
| levels &= ~(((uint32_t)1 << minLevel) - 1); |
| if(levels == 0) { return; } |
| |
| uint32_t variableTop; |
| if((options & CollationSettings::ALTERNATE_MASK) == 0) { |
| variableTop = 0; |
| } else { |
| // +1 so that we can use "<" and primary ignorables test out early. |
| variableTop = settings.variableTop + 1; |
| } |
| |
| uint32_t tertiaryMask = CollationSettings::getTertiaryMask(options); |
| |
| SortKeyLevel cases; |
| SortKeyLevel secondaries; |
| SortKeyLevel tertiaries; |
| SortKeyLevel quaternaries; |
| |
| uint32_t prevReorderedPrimary = 0; // 0==no compression |
| int32_t commonCases = 0; |
| int32_t commonSecondaries = 0; |
| int32_t commonTertiaries = 0; |
| int32_t commonQuaternaries = 0; |
| |
| uint32_t prevSecondary = 0; |
| int32_t secSegmentStart = 0; |
| |
| for(;;) { |
| // No need to keep all CEs in the buffer when we write a sort key. |
| iter.clearCEsIfNoneRemaining(); |
| int64_t ce = iter.nextCE(errorCode); |
| uint32_t p = (uint32_t)(ce >> 32); |
| if(p < variableTop && p > Collation::MERGE_SEPARATOR_PRIMARY) { |
| // Variable CE, shift it to quaternary level. |
| // Ignore all following primary ignorables, and shift further variable CEs. |
| if(commonQuaternaries != 0) { |
| --commonQuaternaries; |
| while(commonQuaternaries >= QUAT_COMMON_MAX_COUNT) { |
| quaternaries.appendByte(QUAT_COMMON_MIDDLE); |
| commonQuaternaries -= QUAT_COMMON_MAX_COUNT; |
| } |
| // Shifted primary weights are lower than the common weight. |
| quaternaries.appendByte(QUAT_COMMON_LOW + commonQuaternaries); |
| commonQuaternaries = 0; |
| } |
| do { |
| if((levels & Collation::QUATERNARY_LEVEL_FLAG) != 0) { |
| if(settings.hasReordering()) { |
| p = settings.reorder(p); |
| } |
| if((p >> 24) >= QUAT_SHIFTED_LIMIT_BYTE) { |
| // Prevent shifted primary lead bytes from |
| // overlapping with the common compression range. |
| quaternaries.appendByte(QUAT_SHIFTED_LIMIT_BYTE); |
| } |
| quaternaries.appendWeight32(p); |
| } |
| do { |
| ce = iter.nextCE(errorCode); |
| p = (uint32_t)(ce >> 32); |
| } while(p == 0); |
| } while(p < variableTop && p > Collation::MERGE_SEPARATOR_PRIMARY); |
| } |
| // ce could be primary ignorable, or NO_CE, or the merge separator, |
| // or a regular primary CE, but it is not variable. |
| // If ce==NO_CE, then write nothing for the primary level but |
| // terminate compression on all levels and then exit the loop. |
| if(p > Collation::NO_CE_PRIMARY && (levels & Collation::PRIMARY_LEVEL_FLAG) != 0) { |
| // Test the un-reordered primary for compressibility. |
| UBool isCompressible = compressibleBytes[p >> 24]; |
| if(settings.hasReordering()) { |
| p = settings.reorder(p); |
| } |
| uint32_t p1 = p >> 24; |
| if(!isCompressible || p1 != (prevReorderedPrimary >> 24)) { |
| if(prevReorderedPrimary != 0) { |
| if(p < prevReorderedPrimary) { |
| // No primary compression terminator |
| // at the end of the level or merged segment. |
| if(p1 > Collation::MERGE_SEPARATOR_BYTE) { |
| sink.Append(Collation::PRIMARY_COMPRESSION_LOW_BYTE); |
| } |
| } else { |
| sink.Append(Collation::PRIMARY_COMPRESSION_HIGH_BYTE); |
| } |
| } |
| sink.Append(p1); |
| if(isCompressible) { |
| prevReorderedPrimary = p; |
| } else { |
| prevReorderedPrimary = 0; |
| } |
| } |
| char p2 = (char)(p >> 16); |
| if(p2 != 0) { |
| char buffer[3] = { p2, (char)(p >> 8), (char)p }; |
| sink.Append(buffer, (buffer[1] == 0) ? 1 : (buffer[2] == 0) ? 2 : 3); |
| } |
| // Optimization for internalNextSortKeyPart(): |
| // When the primary level overflows we can stop because we need not |
| // calculate (preflight) the whole sort key length. |
| if(!preflight && sink.Overflowed()) { |
| if(U_SUCCESS(errorCode) && !sink.IsOk()) { |
| errorCode = U_MEMORY_ALLOCATION_ERROR; |
| } |
| return; |
| } |
| } |
| |
| uint32_t lower32 = (uint32_t)ce; |
| if(lower32 == 0) { continue; } // completely ignorable, no secondary/case/tertiary/quaternary |
| |
| if((levels & Collation::SECONDARY_LEVEL_FLAG) != 0) { |
| uint32_t s = lower32 >> 16; |
| if(s == 0) { |
| // secondary ignorable |
| } else if(s == Collation::COMMON_WEIGHT16 && |
| ((options & CollationSettings::BACKWARD_SECONDARY) == 0 || |
| p != Collation::MERGE_SEPARATOR_PRIMARY)) { |
| // s is a common secondary weight, and |
| // backwards-secondary is off or the ce is not the merge separator. |
| ++commonSecondaries; |
| } else if((options & CollationSettings::BACKWARD_SECONDARY) == 0) { |
| if(commonSecondaries != 0) { |
| --commonSecondaries; |
| while(commonSecondaries >= SEC_COMMON_MAX_COUNT) { |
| secondaries.appendByte(SEC_COMMON_MIDDLE); |
| commonSecondaries -= SEC_COMMON_MAX_COUNT; |
| } |
| uint32_t b; |
| if(s < Collation::COMMON_WEIGHT16) { |
| b = SEC_COMMON_LOW + commonSecondaries; |
| } else { |
| b = SEC_COMMON_HIGH - commonSecondaries; |
| } |
| secondaries.appendByte(b); |
| commonSecondaries = 0; |
| } |
| secondaries.appendWeight16(s); |
| } else { |
| if(commonSecondaries != 0) { |
| --commonSecondaries; |
| // Append reverse weights. The level will be re-reversed later. |
| int32_t remainder = commonSecondaries % SEC_COMMON_MAX_COUNT; |
| uint32_t b; |
| if(prevSecondary < Collation::COMMON_WEIGHT16) { |
| b = SEC_COMMON_LOW + remainder; |
| } else { |
| b = SEC_COMMON_HIGH - remainder; |
| } |
| secondaries.appendByte(b); |
| commonSecondaries -= remainder; |
| // commonSecondaries is now a multiple of SEC_COMMON_MAX_COUNT. |
| while(commonSecondaries > 0) { // same as >= SEC_COMMON_MAX_COUNT |
| secondaries.appendByte(SEC_COMMON_MIDDLE); |
| commonSecondaries -= SEC_COMMON_MAX_COUNT; |
| } |
| // commonSecondaries == 0 |
| } |
| if(0 < p && p <= Collation::MERGE_SEPARATOR_PRIMARY) { |
| // The backwards secondary level compares secondary weights backwards |
| // within segments separated by the merge separator (U+FFFE). |
| uint8_t *secs = secondaries.data(); |
| int32_t last = secondaries.length() - 1; |
| if(secSegmentStart < last) { |
| uint8_t *q = secs + secSegmentStart; |
| uint8_t *r = secs + last; |
| do { |
| uint8_t b = *q; |
| *q++ = *r; |
| *r-- = b; |
| } while(q < r); |
| } |
| secondaries.appendByte(p == Collation::NO_CE_PRIMARY ? |
| Collation::LEVEL_SEPARATOR_BYTE : Collation::MERGE_SEPARATOR_BYTE); |
| prevSecondary = 0; |
| secSegmentStart = secondaries.length(); |
| } else { |
| secondaries.appendReverseWeight16(s); |
| prevSecondary = s; |
| } |
| } |
| } |
| |
| if((levels & Collation::CASE_LEVEL_FLAG) != 0) { |
| if((CollationSettings::getStrength(options) == UCOL_PRIMARY) ? |
| p == 0 : lower32 <= 0xffff) { |
| // Primary+caseLevel: Ignore case level weights of primary ignorables. |
| // Otherwise: Ignore case level weights of secondary ignorables. |
| // For details see the comments in the CollationCompare class. |
| } else { |
| uint32_t c = (lower32 >> 8) & 0xff; // case bits & tertiary lead byte |
| U_ASSERT((c & 0xc0) != 0xc0); |
| if((c & 0xc0) == 0 && c > Collation::LEVEL_SEPARATOR_BYTE) { |
| ++commonCases; |
| } else { |
| if((options & CollationSettings::UPPER_FIRST) == 0) { |
| // lowerFirst: Compress common weights to nibbles 1..7..13, mixed=14, upper=15. |
| // If there are only common (=lowest) weights in the whole level, |
| // then we need not write anything. |
| // Level length differences are handled already on the next-higher level. |
| if(commonCases != 0 && |
| (c > Collation::LEVEL_SEPARATOR_BYTE || !cases.isEmpty())) { |
| --commonCases; |
| while(commonCases >= CASE_LOWER_FIRST_COMMON_MAX_COUNT) { |
| cases.appendByte(CASE_LOWER_FIRST_COMMON_MIDDLE << 4); |
| commonCases -= CASE_LOWER_FIRST_COMMON_MAX_COUNT; |
| } |
| uint32_t b; |
| if(c <= Collation::LEVEL_SEPARATOR_BYTE) { |
| b = CASE_LOWER_FIRST_COMMON_LOW + commonCases; |
| } else { |
| b = CASE_LOWER_FIRST_COMMON_HIGH - commonCases; |
| } |
| cases.appendByte(b << 4); |
| commonCases = 0; |
| } |
| if(c > Collation::LEVEL_SEPARATOR_BYTE) { |
| c = (CASE_LOWER_FIRST_COMMON_HIGH + (c >> 6)) << 4; // 14 or 15 |
| } |
| } else { |
| // upperFirst: Compress common weights to nibbles 3..15, mixed=2, upper=1. |
| // The compressed common case weights only go up from the "low" value |
| // because with upperFirst the common weight is the highest one. |
| if(commonCases != 0) { |
| --commonCases; |
| while(commonCases >= CASE_UPPER_FIRST_COMMON_MAX_COUNT) { |
| cases.appendByte(CASE_UPPER_FIRST_COMMON_LOW << 4); |
| commonCases -= CASE_UPPER_FIRST_COMMON_MAX_COUNT; |
| } |
| cases.appendByte((CASE_UPPER_FIRST_COMMON_LOW + commonCases) << 4); |
| commonCases = 0; |
| } |
| if(c > Collation::LEVEL_SEPARATOR_BYTE) { |
| c = (CASE_UPPER_FIRST_COMMON_LOW - (c >> 6)) << 4; // 2 or 1 |
| } |
| } |
| // c is a separator byte 01, |
| // or a left-shifted nibble 0x10, 0x20, ... 0xf0. |
| cases.appendByte(c); |
| } |
| } |
| } |
| |
| if((levels & Collation::TERTIARY_LEVEL_FLAG) != 0) { |
| uint32_t t = lower32 & tertiaryMask; |
| U_ASSERT((lower32 & 0xc000) != 0xc000); |
| if(t == Collation::COMMON_WEIGHT16) { |
| ++commonTertiaries; |
| } else if((tertiaryMask & 0x8000) == 0) { |
| // Tertiary weights without case bits. |
| // Move lead bytes 06..3F to C6..FF for a large common-weight range. |
| if(commonTertiaries != 0) { |
| --commonTertiaries; |
| while(commonTertiaries >= TER_ONLY_COMMON_MAX_COUNT) { |
| tertiaries.appendByte(TER_ONLY_COMMON_MIDDLE); |
| commonTertiaries -= TER_ONLY_COMMON_MAX_COUNT; |
| } |
| uint32_t b; |
| if(t < Collation::COMMON_WEIGHT16) { |
| b = TER_ONLY_COMMON_LOW + commonTertiaries; |
| } else { |
| b = TER_ONLY_COMMON_HIGH - commonTertiaries; |
| } |
| tertiaries.appendByte(b); |
| commonTertiaries = 0; |
| } |
| if(t > Collation::COMMON_WEIGHT16) { t += 0xc000; } |
| tertiaries.appendWeight16(t); |
| } else if((options & CollationSettings::UPPER_FIRST) == 0) { |
| // Tertiary weights with caseFirst=lowerFirst. |
| // Move lead bytes 06..BF to 46..FF for the common-weight range. |
| if(commonTertiaries != 0) { |
| --commonTertiaries; |
| while(commonTertiaries >= TER_LOWER_FIRST_COMMON_MAX_COUNT) { |
| tertiaries.appendByte(TER_LOWER_FIRST_COMMON_MIDDLE); |
| commonTertiaries -= TER_LOWER_FIRST_COMMON_MAX_COUNT; |
| } |
| uint32_t b; |
| if(t < Collation::COMMON_WEIGHT16) { |
| b = TER_LOWER_FIRST_COMMON_LOW + commonTertiaries; |
| } else { |
| b = TER_LOWER_FIRST_COMMON_HIGH - commonTertiaries; |
| } |
| tertiaries.appendByte(b); |
| commonTertiaries = 0; |
| } |
| if(t > Collation::COMMON_WEIGHT16) { t += 0x4000; } |
| tertiaries.appendWeight16(t); |
| } else { |
| // Tertiary weights with caseFirst=upperFirst. |
| // Do not change the artificial uppercase weight of a tertiary CE (0.0.ut), |
| // to keep tertiary CEs well-formed. |
| // Their case+tertiary weights must be greater than those of |
| // primary and secondary CEs. |
| // |
| // Separator 01 -> 01 (unchanged) |
| // Lowercase 02..04 -> 82..84 (includes uncased) |
| // Common weight 05 -> 85..C5 (common-weight compression range) |
| // Lowercase 06..3F -> C6..FF |
| // Mixed case 42..7F -> 42..7F |
| // Uppercase 82..BF -> 02..3F |
| // Tertiary CE 86..BF -> C6..FF |
| if(t <= Collation::NO_CE_WEIGHT16) { |
| // Keep separators unchanged. |
| } else if(lower32 > 0xffff) { |
| // Invert case bits of primary & secondary CEs. |
| t ^= 0xc000; |
| if(t < (TER_UPPER_FIRST_COMMON_HIGH << 8)) { |
| t -= 0x4000; |
| } |
| } else { |
| // Keep uppercase bits of tertiary CEs. |
| U_ASSERT(0x8600 <= t && t <= 0xbfff); |
| t += 0x4000; |
| } |
| if(commonTertiaries != 0) { |
| --commonTertiaries; |
| while(commonTertiaries >= TER_UPPER_FIRST_COMMON_MAX_COUNT) { |
| tertiaries.appendByte(TER_UPPER_FIRST_COMMON_MIDDLE); |
| commonTertiaries -= TER_UPPER_FIRST_COMMON_MAX_COUNT; |
| } |
| uint32_t b; |
| if(t < (TER_UPPER_FIRST_COMMON_LOW << 8)) { |
| b = TER_UPPER_FIRST_COMMON_LOW + commonTertiaries; |
| } else { |
| b = TER_UPPER_FIRST_COMMON_HIGH - commonTertiaries; |
| } |
| tertiaries.appendByte(b); |
| commonTertiaries = 0; |
| } |
| tertiaries.appendWeight16(t); |
| } |
| } |
| |
| if((levels & Collation::QUATERNARY_LEVEL_FLAG) != 0) { |
| uint32_t q = lower32 & 0xffff; |
| if((q & 0xc0) == 0 && q > Collation::NO_CE_WEIGHT16) { |
| ++commonQuaternaries; |
| } else if(q == Collation::NO_CE_WEIGHT16 && |
| (options & CollationSettings::ALTERNATE_MASK) == 0 && |
| quaternaries.isEmpty()) { |
| // If alternate=non-ignorable and there are only common quaternary weights, |
| // then we need not write anything. |
| // The only weights greater than the merge separator and less than the common weight |
| // are shifted primary weights, which are not generated for alternate=non-ignorable. |
| // There are also exactly as many quaternary weights as tertiary weights, |
| // so level length differences are handled already on tertiary level. |
| // Any above-common quaternary weight will compare greater regardless. |
| quaternaries.appendByte(Collation::LEVEL_SEPARATOR_BYTE); |
| } else { |
| if(q == Collation::NO_CE_WEIGHT16) { |
| q = Collation::LEVEL_SEPARATOR_BYTE; |
| } else { |
| q = 0xfc + ((q >> 6) & 3); |
| } |
| if(commonQuaternaries != 0) { |
| --commonQuaternaries; |
| while(commonQuaternaries >= QUAT_COMMON_MAX_COUNT) { |
| quaternaries.appendByte(QUAT_COMMON_MIDDLE); |
| commonQuaternaries -= QUAT_COMMON_MAX_COUNT; |
| } |
| uint32_t b; |
| if(q < QUAT_COMMON_LOW) { |
| b = QUAT_COMMON_LOW + commonQuaternaries; |
| } else { |
| b = QUAT_COMMON_HIGH - commonQuaternaries; |
| } |
| quaternaries.appendByte(b); |
| commonQuaternaries = 0; |
| } |
| quaternaries.appendByte(q); |
| } |
| } |
| |
| if((lower32 >> 24) == Collation::LEVEL_SEPARATOR_BYTE) { break; } // ce == NO_CE |
| } |
| |
| if(U_FAILURE(errorCode)) { return; } |
| |
| // Append the beyond-primary levels. |
| UBool ok = TRUE; |
| if((levels & Collation::SECONDARY_LEVEL_FLAG) != 0) { |
| if(!callback.needToWrite(Collation::SECONDARY_LEVEL)) { return; } |
| ok &= secondaries.isOk(); |
| sink.Append(Collation::LEVEL_SEPARATOR_BYTE); |
| secondaries.appendTo(sink); |
| } |
| |
| if((levels & Collation::CASE_LEVEL_FLAG) != 0) { |
| if(!callback.needToWrite(Collation::CASE_LEVEL)) { return; } |
| ok &= cases.isOk(); |
| sink.Append(Collation::LEVEL_SEPARATOR_BYTE); |
| // Write pairs of nibbles as bytes, except separator bytes as themselves. |
| int32_t length = cases.length() - 1; // Ignore the trailing NO_CE. |
| uint8_t b = 0; |
| for(int32_t i = 0; i < length; ++i) { |
| uint8_t c = (uint8_t)cases[i]; |
| U_ASSERT((c & 0xf) == 0 && c != 0); |
| if(b == 0) { |
| b = c; |
| } else { |
| sink.Append(b | (c >> 4)); |
| b = 0; |
| } |
| } |
| if(b != 0) { |
| sink.Append(b); |
| } |
| } |
| |
| if((levels & Collation::TERTIARY_LEVEL_FLAG) != 0) { |
| if(!callback.needToWrite(Collation::TERTIARY_LEVEL)) { return; } |
| ok &= tertiaries.isOk(); |
| sink.Append(Collation::LEVEL_SEPARATOR_BYTE); |
| tertiaries.appendTo(sink); |
| } |
| |
| if((levels & Collation::QUATERNARY_LEVEL_FLAG) != 0) { |
| if(!callback.needToWrite(Collation::QUATERNARY_LEVEL)) { return; } |
| ok &= quaternaries.isOk(); |
| sink.Append(Collation::LEVEL_SEPARATOR_BYTE); |
| quaternaries.appendTo(sink); |
| } |
| |
| if(!ok || !sink.IsOk()) { |
| errorCode = U_MEMORY_ALLOCATION_ERROR; |
| } |
| } |
| |
| U_NAMESPACE_END |
| |
| #endif // !UCONFIG_NO_COLLATION |
