718 lines
28 KiB
C++
718 lines
28 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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* Copyright (C) 2013-2015, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* collationfastlatinbuilder.cpp
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*
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* created on: 2013aug09
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* created by: Markus W. Scherer
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*/
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#define DEBUG_COLLATION_FAST_LATIN_BUILDER 0 // 0 or 1 or 2
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#if DEBUG_COLLATION_FAST_LATIN_BUILDER
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#include <stdio.h>
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#include <string>
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#endif
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_COLLATION
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#include "unicode/ucol.h"
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#include "unicode/ucharstrie.h"
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#include "unicode/unistr.h"
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#include "unicode/uobject.h"
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#include "unicode/uscript.h"
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#include "cmemory.h"
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#include "collation.h"
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#include "collationdata.h"
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#include "collationfastlatin.h"
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#include "collationfastlatinbuilder.h"
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#include "uassert.h"
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#include "uvectr64.h"
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U_NAMESPACE_BEGIN
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struct CollationData;
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namespace {
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/**
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* Compare two signed int64_t values as if they were unsigned.
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*/
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int32_t
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compareInt64AsUnsigned(int64_t a, int64_t b) {
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if((uint64_t)a < (uint64_t)b) {
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return -1;
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} else if((uint64_t)a > (uint64_t)b) {
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return 1;
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} else {
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return 0;
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}
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}
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// TODO: Merge this with the near-identical version in collationbasedatabuilder.cpp
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/**
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* Like Java Collections.binarySearch(List, String, Comparator).
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*
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* @return the index>=0 where the item was found,
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* or the index<0 for inserting the string at ~index in sorted order
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*/
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int32_t
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binarySearch(const int64_t list[], int32_t limit, int64_t ce) {
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if (limit == 0) { return ~0; }
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int32_t start = 0;
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for (;;) {
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int32_t i = (start + limit) / 2;
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int32_t cmp = compareInt64AsUnsigned(ce, list[i]);
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if (cmp == 0) {
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return i;
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} else if (cmp < 0) {
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if (i == start) {
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return ~start; // insert ce before i
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}
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limit = i;
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} else {
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if (i == start) {
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return ~(start + 1); // insert ce after i
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}
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start = i;
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}
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}
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}
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} // namespace
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CollationFastLatinBuilder::CollationFastLatinBuilder(UErrorCode &errorCode)
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: ce0(0), ce1(0),
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contractionCEs(errorCode), uniqueCEs(errorCode),
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miniCEs(NULL),
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firstDigitPrimary(0), firstLatinPrimary(0), lastLatinPrimary(0),
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firstShortPrimary(0), shortPrimaryOverflow(FALSE),
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headerLength(0) {
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}
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CollationFastLatinBuilder::~CollationFastLatinBuilder() {
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uprv_free(miniCEs);
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}
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UBool
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CollationFastLatinBuilder::forData(const CollationData &data, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return FALSE; }
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if(!result.isEmpty()) { // This builder is not reusable.
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errorCode = U_INVALID_STATE_ERROR;
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return FALSE;
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}
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if(!loadGroups(data, errorCode)) { return FALSE; }
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// Fast handling of digits.
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firstShortPrimary = firstDigitPrimary;
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getCEs(data, errorCode);
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if(!encodeUniqueCEs(errorCode)) { return FALSE; }
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if(shortPrimaryOverflow) {
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// Give digits long mini primaries,
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// so that there are more short primaries for letters.
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firstShortPrimary = firstLatinPrimary;
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resetCEs();
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getCEs(data, errorCode);
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if(!encodeUniqueCEs(errorCode)) { return FALSE; }
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}
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// Note: If we still have a short-primary overflow but not a long-primary overflow,
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// then we could calculate how many more long primaries would fit,
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// and set the firstShortPrimary to that many after the current firstShortPrimary,
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// and try again.
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// However, this might only benefit the en_US_POSIX tailoring,
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// and it is simpler to suppress building fast Latin data for it in genrb,
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// or by returning FALSE here if shortPrimaryOverflow.
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UBool ok = !shortPrimaryOverflow &&
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encodeCharCEs(errorCode) && encodeContractions(errorCode);
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contractionCEs.removeAllElements(); // might reduce heap memory usage
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uniqueCEs.removeAllElements();
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return ok;
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}
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UBool
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CollationFastLatinBuilder::loadGroups(const CollationData &data, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return FALSE; }
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headerLength = 1 + NUM_SPECIAL_GROUPS;
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uint32_t r0 = (CollationFastLatin::VERSION << 8) | headerLength;
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result.append((UChar)r0);
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// The first few reordering groups should be special groups
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// (space, punct, ..., digit) followed by Latn, then Grek and other scripts.
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for(int32_t i = 0; i < NUM_SPECIAL_GROUPS; ++i) {
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lastSpecialPrimaries[i] = data.getLastPrimaryForGroup(UCOL_REORDER_CODE_FIRST + i);
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if(lastSpecialPrimaries[i] == 0) {
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// missing data
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return FALSE;
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}
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result.append((UChar)0); // reserve a slot for this group
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}
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firstDigitPrimary = data.getFirstPrimaryForGroup(UCOL_REORDER_CODE_DIGIT);
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firstLatinPrimary = data.getFirstPrimaryForGroup(USCRIPT_LATIN);
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lastLatinPrimary = data.getLastPrimaryForGroup(USCRIPT_LATIN);
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if(firstDigitPrimary == 0 || firstLatinPrimary == 0) {
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// missing data
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return FALSE;
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}
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return TRUE;
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}
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UBool
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CollationFastLatinBuilder::inSameGroup(uint32_t p, uint32_t q) const {
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// Both or neither need to be encoded as short primaries,
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// so that we can test only one and use the same bit mask.
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if(p >= firstShortPrimary) {
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return q >= firstShortPrimary;
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} else if(q >= firstShortPrimary) {
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return FALSE;
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}
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// Both or neither must be potentially-variable,
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// so that we can test only one and determine if both are variable.
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uint32_t lastVariablePrimary = lastSpecialPrimaries[NUM_SPECIAL_GROUPS - 1];
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if(p > lastVariablePrimary) {
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return q > lastVariablePrimary;
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} else if(q > lastVariablePrimary) {
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return FALSE;
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}
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// Both will be encoded with long mini primaries.
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// They must be in the same special reordering group,
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// so that we can test only one and determine if both are variable.
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U_ASSERT(p != 0 && q != 0);
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for(int32_t i = 0;; ++i) { // will terminate
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uint32_t lastPrimary = lastSpecialPrimaries[i];
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if(p <= lastPrimary) {
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return q <= lastPrimary;
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} else if(q <= lastPrimary) {
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return FALSE;
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}
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}
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}
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void
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CollationFastLatinBuilder::resetCEs() {
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contractionCEs.removeAllElements();
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uniqueCEs.removeAllElements();
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shortPrimaryOverflow = FALSE;
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result.truncate(headerLength);
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}
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void
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CollationFastLatinBuilder::getCEs(const CollationData &data, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return; }
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int32_t i = 0;
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for(UChar c = 0;; ++i, ++c) {
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if(c == CollationFastLatin::LATIN_LIMIT) {
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c = CollationFastLatin::PUNCT_START;
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} else if(c == CollationFastLatin::PUNCT_LIMIT) {
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break;
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}
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const CollationData *d;
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uint32_t ce32 = data.getCE32(c);
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if(ce32 == Collation::FALLBACK_CE32) {
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d = data.base;
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ce32 = d->getCE32(c);
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} else {
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d = &data;
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}
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if(getCEsFromCE32(*d, c, ce32, errorCode)) {
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charCEs[i][0] = ce0;
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charCEs[i][1] = ce1;
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addUniqueCE(ce0, errorCode);
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addUniqueCE(ce1, errorCode);
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} else {
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// bail out for c
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charCEs[i][0] = ce0 = Collation::NO_CE;
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charCEs[i][1] = ce1 = 0;
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}
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if(c == 0 && !isContractionCharCE(ce0)) {
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// Always map U+0000 to a contraction.
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// Write a contraction list with only a default value if there is no real contraction.
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U_ASSERT(contractionCEs.isEmpty());
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addContractionEntry(CollationFastLatin::CONTR_CHAR_MASK, ce0, ce1, errorCode);
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charCEs[0][0] = ((int64_t)Collation::NO_CE_PRIMARY << 32) | CONTRACTION_FLAG;
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charCEs[0][1] = 0;
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}
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}
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// Terminate the last contraction list.
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contractionCEs.addElement(CollationFastLatin::CONTR_CHAR_MASK, errorCode);
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}
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UBool
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CollationFastLatinBuilder::getCEsFromCE32(const CollationData &data, UChar32 c, uint32_t ce32,
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UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return FALSE; }
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ce32 = data.getFinalCE32(ce32);
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ce1 = 0;
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if(Collation::isSimpleOrLongCE32(ce32)) {
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ce0 = Collation::ceFromCE32(ce32);
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} else {
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switch(Collation::tagFromCE32(ce32)) {
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case Collation::LATIN_EXPANSION_TAG:
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ce0 = Collation::latinCE0FromCE32(ce32);
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ce1 = Collation::latinCE1FromCE32(ce32);
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break;
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case Collation::EXPANSION32_TAG: {
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const uint32_t *ce32s = data.ce32s + Collation::indexFromCE32(ce32);
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int32_t length = Collation::lengthFromCE32(ce32);
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if(length <= 2) {
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ce0 = Collation::ceFromCE32(ce32s[0]);
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if(length == 2) {
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ce1 = Collation::ceFromCE32(ce32s[1]);
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}
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break;
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} else {
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return FALSE;
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}
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}
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case Collation::EXPANSION_TAG: {
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const int64_t *ces = data.ces + Collation::indexFromCE32(ce32);
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int32_t length = Collation::lengthFromCE32(ce32);
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if(length <= 2) {
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ce0 = ces[0];
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if(length == 2) {
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ce1 = ces[1];
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}
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break;
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} else {
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return FALSE;
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}
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}
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// Note: We could support PREFIX_TAG (assert c>=0)
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// by recursing on its default CE32 and checking that none of the prefixes starts
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// with a fast Latin character.
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// However, currently (2013) there are only the L-before-middle-dot
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// prefix mappings in the Latin range, and those would be rejected anyway.
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case Collation::CONTRACTION_TAG:
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U_ASSERT(c >= 0);
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return getCEsFromContractionCE32(data, ce32, errorCode);
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case Collation::OFFSET_TAG:
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U_ASSERT(c >= 0);
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ce0 = data.getCEFromOffsetCE32(c, ce32);
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break;
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default:
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return FALSE;
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}
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}
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// A mapping can be completely ignorable.
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if(ce0 == 0) { return ce1 == 0; }
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// We do not support an ignorable ce0 unless it is completely ignorable.
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uint32_t p0 = (uint32_t)(ce0 >> 32);
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if(p0 == 0) { return FALSE; }
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// We only support primaries up to the Latin script.
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if(p0 > lastLatinPrimary) { return FALSE; }
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// We support non-common secondary and case weights only together with short primaries.
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uint32_t lower32_0 = (uint32_t)ce0;
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if(p0 < firstShortPrimary) {
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uint32_t sc0 = lower32_0 & Collation::SECONDARY_AND_CASE_MASK;
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if(sc0 != Collation::COMMON_SECONDARY_CE) { return FALSE; }
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}
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// No below-common tertiary weights.
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if((lower32_0 & Collation::ONLY_TERTIARY_MASK) < Collation::COMMON_WEIGHT16) { return FALSE; }
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if(ce1 != 0) {
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// Both primaries must be in the same group,
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// or both must get short mini primaries,
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// or a short-primary CE is followed by a secondary CE.
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// This is so that we can test the first primary and use the same mask for both,
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// and determine for both whether they are variable.
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uint32_t p1 = (uint32_t)(ce1 >> 32);
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if(p1 == 0 ? p0 < firstShortPrimary : !inSameGroup(p0, p1)) { return FALSE; }
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uint32_t lower32_1 = (uint32_t)ce1;
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// No tertiary CEs.
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if((lower32_1 >> 16) == 0) { return FALSE; }
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// We support non-common secondary and case weights
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// only for secondary CEs or together with short primaries.
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if(p1 != 0 && p1 < firstShortPrimary) {
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uint32_t sc1 = lower32_1 & Collation::SECONDARY_AND_CASE_MASK;
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if(sc1 != Collation::COMMON_SECONDARY_CE) { return FALSE; }
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}
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// No below-common tertiary weights.
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if((lower32_1 & Collation::ONLY_TERTIARY_MASK) < Collation::COMMON_WEIGHT16) { return FALSE; }
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}
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// No quaternary weights.
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if(((ce0 | ce1) & Collation::QUATERNARY_MASK) != 0) { return FALSE; }
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return TRUE;
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}
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UBool
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CollationFastLatinBuilder::getCEsFromContractionCE32(const CollationData &data, uint32_t ce32,
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UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return FALSE; }
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const UChar *p = data.contexts + Collation::indexFromCE32(ce32);
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ce32 = CollationData::readCE32(p); // Default if no suffix match.
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// Since the original ce32 is not a prefix mapping,
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// the default ce32 must not be another contraction.
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U_ASSERT(!Collation::isContractionCE32(ce32));
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int32_t contractionIndex = contractionCEs.size();
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if(getCEsFromCE32(data, U_SENTINEL, ce32, errorCode)) {
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addContractionEntry(CollationFastLatin::CONTR_CHAR_MASK, ce0, ce1, errorCode);
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} else {
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// Bail out for c-without-contraction.
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addContractionEntry(CollationFastLatin::CONTR_CHAR_MASK, Collation::NO_CE, 0, errorCode);
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}
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// Handle an encodable contraction unless the next contraction is too long
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// and starts with the same character.
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int32_t prevX = -1;
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UBool addContraction = FALSE;
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UCharsTrie::Iterator suffixes(p + 2, 0, errorCode);
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while(suffixes.next(errorCode)) {
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const UnicodeString &suffix = suffixes.getString();
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int32_t x = CollationFastLatin::getCharIndex(suffix.charAt(0));
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if(x < 0) { continue; } // ignore anything but fast Latin text
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if(x == prevX) {
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if(addContraction) {
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// Bail out for all contractions starting with this character.
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addContractionEntry(x, Collation::NO_CE, 0, errorCode);
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addContraction = FALSE;
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}
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continue;
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}
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if(addContraction) {
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addContractionEntry(prevX, ce0, ce1, errorCode);
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}
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ce32 = (uint32_t)suffixes.getValue();
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if(suffix.length() == 1 && getCEsFromCE32(data, U_SENTINEL, ce32, errorCode)) {
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addContraction = TRUE;
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} else {
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addContractionEntry(x, Collation::NO_CE, 0, errorCode);
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addContraction = FALSE;
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}
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prevX = x;
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}
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if(addContraction) {
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addContractionEntry(prevX, ce0, ce1, errorCode);
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}
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if(U_FAILURE(errorCode)) { return FALSE; }
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// Note: There might not be any fast Latin contractions, but
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// we need to enter contraction handling anyway so that we can bail out
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// when there is a non-fast-Latin character following.
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// For example: Danish &Y<<u+umlaut, when we compare Y vs. u\u0308 we need to see the
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// following umlaut and bail out, rather than return the difference of Y vs. u.
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ce0 = ((int64_t)Collation::NO_CE_PRIMARY << 32) | CONTRACTION_FLAG | contractionIndex;
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ce1 = 0;
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return TRUE;
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}
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void
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CollationFastLatinBuilder::addContractionEntry(int32_t x, int64_t cce0, int64_t cce1,
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UErrorCode &errorCode) {
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contractionCEs.addElement(x, errorCode);
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contractionCEs.addElement(cce0, errorCode);
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contractionCEs.addElement(cce1, errorCode);
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addUniqueCE(cce0, errorCode);
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addUniqueCE(cce1, errorCode);
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}
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void
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CollationFastLatinBuilder::addUniqueCE(int64_t ce, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return; }
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if(ce == 0 || (uint32_t)(ce >> 32) == Collation::NO_CE_PRIMARY) { return; }
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ce &= ~(int64_t)Collation::CASE_MASK; // blank out case bits
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int32_t i = binarySearch(uniqueCEs.getBuffer(), uniqueCEs.size(), ce);
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if(i < 0) {
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uniqueCEs.insertElementAt(ce, ~i, errorCode);
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}
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}
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uint32_t
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CollationFastLatinBuilder::getMiniCE(int64_t ce) const {
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ce &= ~(int64_t)Collation::CASE_MASK; // blank out case bits
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int32_t index = binarySearch(uniqueCEs.getBuffer(), uniqueCEs.size(), ce);
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U_ASSERT(index >= 0);
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return miniCEs[index];
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}
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UBool
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CollationFastLatinBuilder::encodeUniqueCEs(UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return FALSE; }
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uprv_free(miniCEs);
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miniCEs = (uint16_t *)uprv_malloc(uniqueCEs.size() * 2);
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if(miniCEs == NULL) {
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errorCode = U_MEMORY_ALLOCATION_ERROR;
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return FALSE;
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}
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int32_t group = 0;
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uint32_t lastGroupPrimary = lastSpecialPrimaries[group];
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// The lowest unique CE must be at least a secondary CE.
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U_ASSERT(((uint32_t)uniqueCEs.elementAti(0) >> 16) != 0);
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uint32_t prevPrimary = 0;
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uint32_t prevSecondary = 0;
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uint32_t pri = 0;
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uint32_t sec = 0;
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uint32_t ter = CollationFastLatin::COMMON_TER;
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for(int32_t i = 0; i < uniqueCEs.size(); ++i) {
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int64_t ce = uniqueCEs.elementAti(i);
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// Note: At least one of the p/s/t weights changes from one unique CE to the next.
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// (uniqueCEs does not store case bits.)
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uint32_t p = (uint32_t)(ce >> 32);
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if(p != prevPrimary) {
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while(p > lastGroupPrimary) {
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U_ASSERT(pri <= CollationFastLatin::MAX_LONG);
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// 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 = static_cast<int32_t>(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
|