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Diffstat (limited to 'intl/icu/source/i18n/collationfastlatinbuilder.cpp')
| -rw-r--r-- | intl/icu/source/i18n/collationfastlatinbuilder.cpp | 717 |
1 files changed, 717 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/collationfastlatinbuilder.cpp b/intl/icu/source/i18n/collationfastlatinbuilder.cpp new file mode 100644 index 000000000..032e5e82a --- /dev/null +++ b/intl/icu/source/i18n/collationfastlatinbuilder.cpp @@ -0,0 +1,717 @@ +// Copyright (C) 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +******************************************************************************* +* Copyright (C) 2013-2015, International Business Machines +* Corporation and others. All Rights Reserved. +******************************************************************************* +* collationfastlatinbuilder.cpp +* +* created on: 2013aug09 +* created by: Markus W. Scherer +*/ + +#define DEBUG_COLLATION_FAST_LATIN_BUILDER 0 // 0 or 1 or 2 +#if DEBUG_COLLATION_FAST_LATIN_BUILDER +#include <stdio.h> +#include <string> +#endif + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_COLLATION + +#include "unicode/ucol.h" +#include "unicode/ucharstrie.h" +#include "unicode/unistr.h" +#include "unicode/uobject.h" +#include "unicode/uscript.h" +#include "cmemory.h" +#include "collation.h" +#include "collationdata.h" +#include "collationfastlatin.h" +#include "collationfastlatinbuilder.h" +#include "uassert.h" +#include "uvectr64.h" + +U_NAMESPACE_BEGIN + +struct CollationData; + +namespace { + +/** + * Compare two signed int64_t values as if they were unsigned. + */ +int32_t +compareInt64AsUnsigned(int64_t a, int64_t b) { + if((uint64_t)a < (uint64_t)b) { + return -1; + } else if((uint64_t)a > (uint64_t)b) { + return 1; + } else { + return 0; + } +} + +// TODO: Merge this with the near-identical version in collationbasedatabuilder.cpp +/** + * Like Java Collections.binarySearch(List, String, Comparator). + * + * @return the index>=0 where the item was found, + * or the index<0 for inserting the string at ~index in sorted order + */ +int32_t +binarySearch(const int64_t list[], int32_t limit, int64_t ce) { + if (limit == 0) { return ~0; } + int32_t start = 0; + for (;;) { + int32_t i = (start + limit) / 2; + int32_t cmp = compareInt64AsUnsigned(ce, list[i]); + if (cmp == 0) { + return i; + } else if (cmp < 0) { + if (i == start) { + return ~start; // insert ce before i + } + limit = i; + } else { + if (i == start) { + return ~(start + 1); // insert ce after i + } + start = i; + } + } +} + +} // namespace + +CollationFastLatinBuilder::CollationFastLatinBuilder(UErrorCode &errorCode) + : ce0(0), ce1(0), + contractionCEs(errorCode), uniqueCEs(errorCode), + miniCEs(NULL), + firstDigitPrimary(0), firstLatinPrimary(0), lastLatinPrimary(0), + firstShortPrimary(0), shortPrimaryOverflow(FALSE), + headerLength(0) { +} + +CollationFastLatinBuilder::~CollationFastLatinBuilder() { + uprv_free(miniCEs); +} + +UBool +CollationFastLatinBuilder::forData(const CollationData &data, UErrorCode &errorCode) { + if(U_FAILURE(errorCode)) { return FALSE; } + if(!result.isEmpty()) { // This builder is not reusable. + errorCode = U_INVALID_STATE_ERROR; + return FALSE; + } + if(!loadGroups(data, errorCode)) { return FALSE; } + + // Fast handling of digits. + firstShortPrimary = firstDigitPrimary; + getCEs(data, errorCode); + if(!encodeUniqueCEs(errorCode)) { return FALSE; } + if(shortPrimaryOverflow) { + // Give digits long mini primaries, + // so that there are more short primaries for letters. + firstShortPrimary = firstLatinPrimary; + resetCEs(); + getCEs(data, errorCode); + if(!encodeUniqueCEs(errorCode)) { return FALSE; } + } + // Note: If we still have a short-primary overflow but not a long-primary overflow, + // then we could calculate how many more long primaries would fit, + // and set the firstShortPrimary to that many after the current firstShortPrimary, + // and try again. + // However, this might only benefit the en_US_POSIX tailoring, + // and it is simpler to suppress building fast Latin data for it in genrb, + // or by returning FALSE here if shortPrimaryOverflow. + + UBool ok = !shortPrimaryOverflow && + encodeCharCEs(errorCode) && encodeContractions(errorCode); + contractionCEs.removeAllElements(); // might reduce heap memory usage + uniqueCEs.removeAllElements(); + return ok; +} + +UBool +CollationFastLatinBuilder::loadGroups(const CollationData &data, UErrorCode &errorCode) { + if(U_FAILURE(errorCode)) { return FALSE; } + headerLength = 1 + NUM_SPECIAL_GROUPS; + uint32_t r0 = (CollationFastLatin::VERSION << 8) | headerLength; + result.append((UChar)r0); + // The first few reordering groups should be special groups + // (space, punct, ..., digit) followed by Latn, then Grek and other scripts. + for(int32_t i = 0; i < NUM_SPECIAL_GROUPS; ++i) { + lastSpecialPrimaries[i] = data.getLastPrimaryForGroup(UCOL_REORDER_CODE_FIRST + i); + if(lastSpecialPrimaries[i] == 0) { + // missing data + return FALSE; + } + result.append((UChar)0); // reserve a slot for this group + } + + firstDigitPrimary = data.getFirstPrimaryForGroup(UCOL_REORDER_CODE_DIGIT); + firstLatinPrimary = data.getFirstPrimaryForGroup(USCRIPT_LATIN); + lastLatinPrimary = data.getLastPrimaryForGroup(USCRIPT_LATIN); + if(firstDigitPrimary == 0 || firstLatinPrimary == 0) { + // missing data + return FALSE; + } + return TRUE; +} + +UBool +CollationFastLatinBuilder::inSameGroup(uint32_t p, uint32_t q) const { + // Both or neither need to be encoded as short primaries, + // so that we can test only one and use the same bit mask. + if(p >= firstShortPrimary) { + return q >= firstShortPrimary; + } else if(q >= firstShortPrimary) { + return FALSE; + } + // Both or neither must be potentially-variable, + // so that we can test only one and determine if both are variable. + uint32_t lastVariablePrimary = lastSpecialPrimaries[NUM_SPECIAL_GROUPS - 1]; + if(p > lastVariablePrimary) { + return q > lastVariablePrimary; + } else if(q > lastVariablePrimary) { + return FALSE; + } + // Both will be encoded with long mini primaries. + // They must be in the same special reordering group, + // so that we can test only one and determine if both are variable. + U_ASSERT(p != 0 && q != 0); + for(int32_t i = 0;; ++i) { // will terminate + uint32_t lastPrimary = lastSpecialPrimaries[i]; + if(p <= lastPrimary) { + return q <= lastPrimary; + } else if(q <= lastPrimary) { + return FALSE; + } + } +} + +void +CollationFastLatinBuilder::resetCEs() { + contractionCEs.removeAllElements(); + uniqueCEs.removeAllElements(); + shortPrimaryOverflow = FALSE; + result.truncate(headerLength); +} + +void +CollationFastLatinBuilder::getCEs(const CollationData &data, UErrorCode &errorCode) { + if(U_FAILURE(errorCode)) { return; } + int32_t i = 0; + for(UChar c = 0;; ++i, ++c) { + if(c == CollationFastLatin::LATIN_LIMIT) { + c = CollationFastLatin::PUNCT_START; + } else if(c == CollationFastLatin::PUNCT_LIMIT) { + break; + } + const CollationData *d; + uint32_t ce32 = data.getCE32(c); + if(ce32 == Collation::FALLBACK_CE32) { + d = data.base; + ce32 = d->getCE32(c); + } else { + d = &data; + } + if(getCEsFromCE32(*d, c, ce32, errorCode)) { + charCEs[i][0] = ce0; + charCEs[i][1] = ce1; + addUniqueCE(ce0, errorCode); + addUniqueCE(ce1, errorCode); + } else { + // bail out for c + charCEs[i][0] = ce0 = Collation::NO_CE; + charCEs[i][1] = ce1 = 0; + } + if(c == 0 && !isContractionCharCE(ce0)) { + // Always map U+0000 to a contraction. + // Write a contraction list with only a default value if there is no real contraction. + U_ASSERT(contractionCEs.isEmpty()); + addContractionEntry(CollationFastLatin::CONTR_CHAR_MASK, ce0, ce1, errorCode); + charCEs[0][0] = ((int64_t)Collation::NO_CE_PRIMARY << 32) | CONTRACTION_FLAG; + charCEs[0][1] = 0; + } + } + // Terminate the last contraction list. + contractionCEs.addElement(CollationFastLatin::CONTR_CHAR_MASK, errorCode); +} + +UBool +CollationFastLatinBuilder::getCEsFromCE32(const CollationData &data, UChar32 c, uint32_t ce32, + UErrorCode &errorCode) { + if(U_FAILURE(errorCode)) { return FALSE; } + ce32 = data.getFinalCE32(ce32); + ce1 = 0; + if(Collation::isSimpleOrLongCE32(ce32)) { + ce0 = Collation::ceFromCE32(ce32); + } else { + switch(Collation::tagFromCE32(ce32)) { + case Collation::LATIN_EXPANSION_TAG: + ce0 = Collation::latinCE0FromCE32(ce32); + ce1 = Collation::latinCE1FromCE32(ce32); + break; + case Collation::EXPANSION32_TAG: { + const uint32_t *ce32s = data.ce32s + Collation::indexFromCE32(ce32); + int32_t length = Collation::lengthFromCE32(ce32); + if(length <= 2) { + ce0 = Collation::ceFromCE32(ce32s[0]); + if(length == 2) { + ce1 = Collation::ceFromCE32(ce32s[1]); + } + break; + } else { + return FALSE; + } + } + case Collation::EXPANSION_TAG: { + const int64_t *ces = data.ces + Collation::indexFromCE32(ce32); + int32_t length = Collation::lengthFromCE32(ce32); + if(length <= 2) { + ce0 = ces[0]; + if(length == 2) { + ce1 = ces[1]; + } + break; + } else { + return FALSE; + } + } + // Note: We could support PREFIX_TAG (assert c>=0) + // by recursing on its default CE32 and checking that none of the prefixes starts + // with a fast Latin character. + // However, currently (2013) there are only the L-before-middle-dot + // prefix mappings in the Latin range, and those would be rejected anyway. + case Collation::CONTRACTION_TAG: + U_ASSERT(c >= 0); + return getCEsFromContractionCE32(data, ce32, errorCode); + case Collation::OFFSET_TAG: + U_ASSERT(c >= 0); + ce0 = data.getCEFromOffsetCE32(c, ce32); + break; + default: + return FALSE; + } + } + // A mapping can be completely ignorable. + if(ce0 == 0) { return ce1 == 0; } + // We do not support an ignorable ce0 unless it is completely ignorable. + uint32_t p0 = (uint32_t)(ce0 >> 32); + if(p0 == 0) { return FALSE; } + // We only support primaries up to the Latin script. + if(p0 > lastLatinPrimary) { return FALSE; } + // We support non-common secondary and case weights only together with short primaries. + uint32_t lower32_0 = (uint32_t)ce0; + if(p0 < firstShortPrimary) { + uint32_t sc0 = lower32_0 & Collation::SECONDARY_AND_CASE_MASK; + if(sc0 != Collation::COMMON_SECONDARY_CE) { return FALSE; } + } + // No below-common tertiary weights. + if((lower32_0 & Collation::ONLY_TERTIARY_MASK) < Collation::COMMON_WEIGHT16) { return FALSE; } + if(ce1 != 0) { + // Both primaries must be in the same group, + // or both must get short mini primaries, + // or a short-primary CE is followed by a secondary CE. + // This is so that we can test the first primary and use the same mask for both, + // and determine for both whether they are variable. + uint32_t p1 = (uint32_t)(ce1 >> 32); + if(p1 == 0 ? p0 < firstShortPrimary : !inSameGroup(p0, p1)) { return FALSE; } + uint32_t lower32_1 = (uint32_t)ce1; + // No tertiary CEs. + if((lower32_1 >> 16) == 0) { return FALSE; } + // We support non-common secondary and case weights + // only for secondary CEs or together with short primaries. + if(p1 != 0 && p1 < firstShortPrimary) { + uint32_t sc1 = lower32_1 & Collation::SECONDARY_AND_CASE_MASK; + if(sc1 != Collation::COMMON_SECONDARY_CE) { return FALSE; } + } + // No below-common tertiary weights. + if((lower32_1 & Collation::ONLY_TERTIARY_MASK) < Collation::COMMON_WEIGHT16) { return FALSE; } + } + // No quaternary weights. + if(((ce0 | ce1) & Collation::QUATERNARY_MASK) != 0) { return FALSE; } + return TRUE; +} + +UBool +CollationFastLatinBuilder::getCEsFromContractionCE32(const CollationData &data, uint32_t ce32, + UErrorCode &errorCode) { + if(U_FAILURE(errorCode)) { return FALSE; } + const UChar *p = data.contexts + Collation::indexFromCE32(ce32); + ce32 = CollationData::readCE32(p); // Default if no suffix match. + // Since the original ce32 is not a prefix mapping, + // the default ce32 must not be another contraction. + U_ASSERT(!Collation::isContractionCE32(ce32)); + int32_t contractionIndex = contractionCEs.size(); + if(getCEsFromCE32(data, U_SENTINEL, ce32, errorCode)) { + addContractionEntry(CollationFastLatin::CONTR_CHAR_MASK, ce0, ce1, errorCode); + } else { + // Bail out for c-without-contraction. + addContractionEntry(CollationFastLatin::CONTR_CHAR_MASK, Collation::NO_CE, 0, errorCode); + } + // Handle an encodable contraction unless the next contraction is too long + // and starts with the same character. + int32_t prevX = -1; + UBool addContraction = FALSE; + UCharsTrie::Iterator suffixes(p + 2, 0, errorCode); + while(suffixes.next(errorCode)) { + const UnicodeString &suffix = suffixes.getString(); + int32_t x = CollationFastLatin::getCharIndex(suffix.charAt(0)); + if(x < 0) { continue; } // ignore anything but fast Latin text + if(x == prevX) { + if(addContraction) { + // Bail out for all contractions starting with this character. + addContractionEntry(x, Collation::NO_CE, 0, errorCode); + addContraction = FALSE; + } + continue; + } + if(addContraction) { + addContractionEntry(prevX, ce0, ce1, errorCode); + } + ce32 = (uint32_t)suffixes.getValue(); + if(suffix.length() == 1 && getCEsFromCE32(data, U_SENTINEL, ce32, errorCode)) { + addContraction = TRUE; + } else { + addContractionEntry(x, Collation::NO_CE, 0, errorCode); + addContraction = FALSE; + } + prevX = x; + } + if(addContraction) { + addContractionEntry(prevX, ce0, ce1, errorCode); + } + if(U_FAILURE(errorCode)) { return FALSE; } + // Note: There might not be any fast Latin contractions, but + // we need to enter contraction handling anyway so that we can bail out + // when there is a non-fast-Latin character following. + // For example: Danish &Y<<u+umlaut, when we compare Y vs. u\u0308 we need to see the + // following umlaut and bail out, rather than return the difference of Y vs. u. + ce0 = ((int64_t)Collation::NO_CE_PRIMARY << 32) | CONTRACTION_FLAG | contractionIndex; + ce1 = 0; + return TRUE; +} + +void +CollationFastLatinBuilder::addContractionEntry(int32_t x, int64_t cce0, int64_t cce1, + UErrorCode &errorCode) { + contractionCEs.addElement(x, errorCode); + contractionCEs.addElement(cce0, errorCode); + contractionCEs.addElement(cce1, errorCode); + addUniqueCE(cce0, errorCode); + addUniqueCE(cce1, errorCode); +} + +void +CollationFastLatinBuilder::addUniqueCE(int64_t ce, UErrorCode &errorCode) { + if(U_FAILURE(errorCode)) { return; } + if(ce == 0 || (uint32_t)(ce >> 32) == Collation::NO_CE_PRIMARY) { return; } + ce &= ~(int64_t)Collation::CASE_MASK; // blank out case bits + int32_t i = binarySearch(uniqueCEs.getBuffer(), uniqueCEs.size(), ce); + if(i < 0) { + uniqueCEs.insertElementAt(ce, ~i, errorCode); + } +} + +uint32_t +CollationFastLatinBuilder::getMiniCE(int64_t ce) const { + ce &= ~(int64_t)Collation::CASE_MASK; // blank out case bits + int32_t index = binarySearch(uniqueCEs.getBuffer(), uniqueCEs.size(), ce); + U_ASSERT(index >= 0); + return miniCEs[index]; +} + +UBool +CollationFastLatinBuilder::encodeUniqueCEs(UErrorCode &errorCode) { + if(U_FAILURE(errorCode)) { return FALSE; } + uprv_free(miniCEs); + miniCEs = (uint16_t *)uprv_malloc(uniqueCEs.size() * 2); + if(miniCEs == NULL) { + errorCode = U_MEMORY_ALLOCATION_ERROR; + return FALSE; + } + int32_t group = 0; + uint32_t lastGroupPrimary = lastSpecialPrimaries[group]; + // The lowest unique CE must be at least a secondary CE. + U_ASSERT(((uint32_t)uniqueCEs.elementAti(0) >> 16) != 0); + uint32_t prevPrimary = 0; + uint32_t prevSecondary = 0; + uint32_t pri = 0; + uint32_t sec = 0; + uint32_t ter = CollationFastLatin::COMMON_TER; + for(int32_t i = 0; i < uniqueCEs.size(); ++i) { + int64_t ce = uniqueCEs.elementAti(i); + // Note: At least one of the p/s/t weights changes from one unique CE to the next. + // (uniqueCEs does not store case bits.) + uint32_t p = (uint32_t)(ce >> 32); + if(p != prevPrimary) { + while(p > lastGroupPrimary) { + U_ASSERT(pri <= CollationFastLatin::MAX_LONG); + // Set the group's header entry to the + // last "long primary" in or before the group. + result.setCharAt(1 + group, (UChar)pri); + if(++group < NUM_SPECIAL_GROUPS) { + lastGroupPrimary = lastSpecialPrimaries[group]; + } else { + lastGroupPrimary = 0xffffffff; + break; + } + } + if(p < firstShortPrimary) { + if(pri == 0) { + pri = CollationFastLatin::MIN_LONG; + } else if(pri < CollationFastLatin::MAX_LONG) { + pri += CollationFastLatin::LONG_INC; + } else { +#if DEBUG_COLLATION_FAST_LATIN_BUILDER + printf("long-primary overflow for %08x\n", p); +#endif + miniCEs[i] = CollationFastLatin::BAIL_OUT; + continue; + } + } else { + if(pri < CollationFastLatin::MIN_SHORT) { + pri = CollationFastLatin::MIN_SHORT; + } else if(pri < (CollationFastLatin::MAX_SHORT - CollationFastLatin::SHORT_INC)) { + // Reserve the highest primary weight for U+FFFF. + pri += CollationFastLatin::SHORT_INC; + } else { +#if DEBUG_COLLATION_FAST_LATIN_BUILDER + printf("short-primary overflow for %08x\n", p); +#endif + shortPrimaryOverflow = TRUE; + miniCEs[i] = CollationFastLatin::BAIL_OUT; + continue; + } + } + prevPrimary = p; + prevSecondary = Collation::COMMON_WEIGHT16; + sec = CollationFastLatin::COMMON_SEC; + ter = CollationFastLatin::COMMON_TER; + } + uint32_t lower32 = (uint32_t)ce; + uint32_t s = lower32 >> 16; + if(s != prevSecondary) { + if(pri == 0) { + if(sec == 0) { + sec = CollationFastLatin::MIN_SEC_HIGH; + } else if(sec < CollationFastLatin::MAX_SEC_HIGH) { + sec += CollationFastLatin::SEC_INC; + } else { + miniCEs[i] = CollationFastLatin::BAIL_OUT; + continue; + } + prevSecondary = s; + ter = CollationFastLatin::COMMON_TER; + } else if(s < Collation::COMMON_WEIGHT16) { + if(sec == CollationFastLatin::COMMON_SEC) { + sec = CollationFastLatin::MIN_SEC_BEFORE; + } else if(sec < CollationFastLatin::MAX_SEC_BEFORE) { + sec += CollationFastLatin::SEC_INC; + } else { + miniCEs[i] = CollationFastLatin::BAIL_OUT; + continue; + } + } else if(s == Collation::COMMON_WEIGHT16) { + sec = CollationFastLatin::COMMON_SEC; + } else { + if(sec < CollationFastLatin::MIN_SEC_AFTER) { + sec = CollationFastLatin::MIN_SEC_AFTER; + } else if(sec < CollationFastLatin::MAX_SEC_AFTER) { + sec += CollationFastLatin::SEC_INC; + } else { + miniCEs[i] = CollationFastLatin::BAIL_OUT; + continue; + } + } + prevSecondary = s; + ter = CollationFastLatin::COMMON_TER; + } + U_ASSERT((lower32 & Collation::CASE_MASK) == 0); // blanked out in uniqueCEs + uint32_t t = lower32 & Collation::ONLY_TERTIARY_MASK; + if(t > Collation::COMMON_WEIGHT16) { + if(ter < CollationFastLatin::MAX_TER_AFTER) { + ++ter; + } else { + miniCEs[i] = CollationFastLatin::BAIL_OUT; + continue; + } + } + if(CollationFastLatin::MIN_LONG <= pri && pri <= CollationFastLatin::MAX_LONG) { + U_ASSERT(sec == CollationFastLatin::COMMON_SEC); + miniCEs[i] = (uint16_t)(pri | ter); + } else { + miniCEs[i] = (uint16_t)(pri | sec | ter); + } + } +#if DEBUG_COLLATION_FAST_LATIN_BUILDER + printf("last mini primary: %04x\n", pri); +#endif +#if DEBUG_COLLATION_FAST_LATIN_BUILDER >= 2 + for(int32_t i = 0; i < uniqueCEs.size(); ++i) { + int64_t ce = uniqueCEs.elementAti(i); + printf("unique CE 0x%016lx -> 0x%04x\n", ce, miniCEs[i]); + } +#endif + return U_SUCCESS(errorCode); +} + +UBool +CollationFastLatinBuilder::encodeCharCEs(UErrorCode &errorCode) { + if(U_FAILURE(errorCode)) { return FALSE; } + int32_t miniCEsStart = result.length(); + for(int32_t i = 0; i < CollationFastLatin::NUM_FAST_CHARS; ++i) { + result.append((UChar)0); // initialize to completely ignorable + } + int32_t indexBase = result.length(); + for(int32_t i = 0; i < CollationFastLatin::NUM_FAST_CHARS; ++i) { + int64_t ce = charCEs[i][0]; + if(isContractionCharCE(ce)) { continue; } // defer contraction + uint32_t miniCE = encodeTwoCEs(ce, charCEs[i][1]); + if(miniCE > 0xffff) { + // Note: There is a chance that this new expansion is the same as a previous one, + // and if so, then we could reuse the other expansion. + // However, that seems unlikely. + int32_t expansionIndex = result.length() - indexBase; + if(expansionIndex > (int32_t)CollationFastLatin::INDEX_MASK) { + miniCE = CollationFastLatin::BAIL_OUT; + } else { + result.append((UChar)(miniCE >> 16)).append((UChar)miniCE); + miniCE = CollationFastLatin::EXPANSION | expansionIndex; + } + } + result.setCharAt(miniCEsStart + i, (UChar)miniCE); + } + return U_SUCCESS(errorCode); +} + +UBool +CollationFastLatinBuilder::encodeContractions(UErrorCode &errorCode) { + // We encode all contraction lists so that the first word of a list + // terminates the previous list, and we only need one additional terminator at the end. + if(U_FAILURE(errorCode)) { return FALSE; } + int32_t indexBase = headerLength + CollationFastLatin::NUM_FAST_CHARS; + int32_t firstContractionIndex = result.length(); + for(int32_t i = 0; i < CollationFastLatin::NUM_FAST_CHARS; ++i) { + int64_t ce = charCEs[i][0]; + if(!isContractionCharCE(ce)) { continue; } + int32_t contractionIndex = result.length() - indexBase; + if(contractionIndex > (int32_t)CollationFastLatin::INDEX_MASK) { + result.setCharAt(headerLength + i, CollationFastLatin::BAIL_OUT); + continue; + } + UBool firstTriple = TRUE; + for(int32_t index = (int32_t)ce & 0x7fffffff;; index += 3) { + int32_t x = contractionCEs.elementAti(index); + if((uint32_t)x == CollationFastLatin::CONTR_CHAR_MASK && !firstTriple) { break; } + int64_t cce0 = contractionCEs.elementAti(index + 1); + int64_t cce1 = contractionCEs.elementAti(index + 2); + uint32_t miniCE = encodeTwoCEs(cce0, cce1); + if(miniCE == CollationFastLatin::BAIL_OUT) { + result.append((UChar)(x | (1 << CollationFastLatin::CONTR_LENGTH_SHIFT))); + } else if(miniCE <= 0xffff) { + result.append((UChar)(x | (2 << CollationFastLatin::CONTR_LENGTH_SHIFT))); + result.append((UChar)miniCE); + } else { + result.append((UChar)(x | (3 << CollationFastLatin::CONTR_LENGTH_SHIFT))); + result.append((UChar)(miniCE >> 16)).append((UChar)miniCE); + } + firstTriple = FALSE; + } + // Note: There is a chance that this new contraction list is the same as a previous one, + // and if so, then we could truncate the result and reuse the other list. + // However, that seems unlikely. + result.setCharAt(headerLength + i, + (UChar)(CollationFastLatin::CONTRACTION | contractionIndex)); + } + if(result.length() > firstContractionIndex) { + // Terminate the last contraction list. + result.append((UChar)CollationFastLatin::CONTR_CHAR_MASK); + } + if(result.isBogus()) { + errorCode = U_MEMORY_ALLOCATION_ERROR; + return FALSE; + } +#if DEBUG_COLLATION_FAST_LATIN_BUILDER + printf("** fast Latin %d * 2 = %d bytes\n", result.length(), result.length() * 2); + puts(" header & below-digit groups map"); + int32_t i = 0; + for(; i < headerLength; ++i) { + printf(" %04x", result[i]); + } + printf("\n char mini CEs"); + U_ASSERT(CollationFastLatin::NUM_FAST_CHARS % 16 == 0); + for(; i < indexBase; i += 16) { + UChar32 c = i - headerLength; + if(c >= CollationFastLatin::LATIN_LIMIT) { + c = CollationFastLatin::PUNCT_START + c - CollationFastLatin::LATIN_LIMIT; + } + printf("\n %04x:", c); + for(int32_t j = 0; j < 16; ++j) { + printf(" %04x", result[i + j]); + } + } + printf("\n expansions & contractions"); + for(; i < result.length(); ++i) { + if((i - indexBase) % 16 == 0) { puts(""); } + printf(" %04x", result[i]); + } + puts(""); +#endif + return TRUE; +} + +uint32_t +CollationFastLatinBuilder::encodeTwoCEs(int64_t first, int64_t second) const { + if(first == 0) { + return 0; // completely ignorable + } + if(first == Collation::NO_CE) { + return CollationFastLatin::BAIL_OUT; + } + U_ASSERT((uint32_t)(first >> 32) != Collation::NO_CE_PRIMARY); + + uint32_t miniCE = getMiniCE(first); + if(miniCE == CollationFastLatin::BAIL_OUT) { return miniCE; } + if(miniCE >= CollationFastLatin::MIN_SHORT) { + // Extract & copy the case bits. + // Shift them from normal CE bits 15..14 to mini CE bits 4..3. + uint32_t c = (((uint32_t)first & Collation::CASE_MASK) >> (14 - 3)); + // Only in mini CEs: Ignorable case bits = 0, lowercase = 1. + c += CollationFastLatin::LOWER_CASE; + miniCE |= c; + } + if(second == 0) { return miniCE; } + + uint32_t miniCE1 = getMiniCE(second); + if(miniCE1 == CollationFastLatin::BAIL_OUT) { return miniCE1; } + + uint32_t case1 = (uint32_t)second & Collation::CASE_MASK; + if(miniCE >= CollationFastLatin::MIN_SHORT && + (miniCE & CollationFastLatin::SECONDARY_MASK) == CollationFastLatin::COMMON_SEC) { + // Try to combine the two mini CEs into one. + uint32_t sec1 = miniCE1 & CollationFastLatin::SECONDARY_MASK; + uint32_t ter1 = miniCE1 & CollationFastLatin::TERTIARY_MASK; + if(sec1 >= CollationFastLatin::MIN_SEC_HIGH && case1 == 0 && + ter1 == CollationFastLatin::COMMON_TER) { + // sec1>=sec_high implies pri1==0. + return (miniCE & ~CollationFastLatin::SECONDARY_MASK) | sec1; + } + } + + if(miniCE1 <= CollationFastLatin::SECONDARY_MASK || CollationFastLatin::MIN_SHORT <= miniCE1) { + // Secondary CE, or a CE with a short primary, copy the case bits. + case1 = (case1 >> (14 - 3)) + CollationFastLatin::LOWER_CASE; + miniCE1 |= case1; + } + return (miniCE << 16) | miniCE1; +} + +U_NAMESPACE_END + +#endif // !UCONFIG_NO_COLLATION |