357 lines
15 KiB
C++
357 lines
15 KiB
C++
// Copyright (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) 1996-2015, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* collationcompare.cpp
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*
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* created on: 2012feb14 with new and old collation code
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* created by: Markus W. Scherer
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*/
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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 "cmemory.h"
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#include "collation.h"
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#include "collationcompare.h"
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#include "collationiterator.h"
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#include "collationsettings.h"
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#include "uassert.h"
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U_NAMESPACE_BEGIN
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UCollationResult
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CollationCompare::compareUpToQuaternary(CollationIterator &left, CollationIterator &right,
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const CollationSettings &settings,
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UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return UCOL_EQUAL; }
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int32_t options = settings.options;
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uint32_t variableTop;
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if((options & CollationSettings::ALTERNATE_MASK) == 0) {
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variableTop = 0;
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} else {
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// +1 so that we can use "<" and primary ignorables test out early.
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variableTop = settings.variableTop + 1;
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}
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UBool anyVariable = FALSE;
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// Fetch CEs, compare primaries, store secondary & tertiary weights.
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for(;;) {
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// We fetch CEs until we get a non-ignorable primary or reach the end.
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uint32_t leftPrimary;
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do {
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int64_t ce = left.nextCE(errorCode);
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leftPrimary = (uint32_t)(ce >> 32);
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if(leftPrimary < variableTop && leftPrimary > Collation::MERGE_SEPARATOR_PRIMARY) {
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// Variable CE, shift it to quaternary level.
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// Ignore all following primary ignorables, and shift further variable CEs.
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anyVariable = TRUE;
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do {
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// Store only the primary of the variable CE.
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left.setCurrentCE(ce & INT64_C(0xffffffff00000000));
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for(;;) {
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ce = left.nextCE(errorCode);
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leftPrimary = (uint32_t)(ce >> 32);
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if(leftPrimary == 0) {
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left.setCurrentCE(0);
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} else {
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break;
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}
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}
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} while(leftPrimary < variableTop &&
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leftPrimary > Collation::MERGE_SEPARATOR_PRIMARY);
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}
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} while(leftPrimary == 0);
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uint32_t rightPrimary;
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do {
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int64_t ce = right.nextCE(errorCode);
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rightPrimary = (uint32_t)(ce >> 32);
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if(rightPrimary < variableTop && rightPrimary > Collation::MERGE_SEPARATOR_PRIMARY) {
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// Variable CE, shift it to quaternary level.
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// Ignore all following primary ignorables, and shift further variable CEs.
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anyVariable = TRUE;
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do {
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// Store only the primary of the variable CE.
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right.setCurrentCE(ce & INT64_C(0xffffffff00000000));
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for(;;) {
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ce = right.nextCE(errorCode);
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rightPrimary = (uint32_t)(ce >> 32);
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if(rightPrimary == 0) {
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right.setCurrentCE(0);
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} else {
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break;
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}
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}
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} while(rightPrimary < variableTop &&
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rightPrimary > Collation::MERGE_SEPARATOR_PRIMARY);
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}
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} while(rightPrimary == 0);
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if(leftPrimary != rightPrimary) {
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// Return the primary difference, with script reordering.
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if(settings.hasReordering()) {
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leftPrimary = settings.reorder(leftPrimary);
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rightPrimary = settings.reorder(rightPrimary);
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}
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return (leftPrimary < rightPrimary) ? UCOL_LESS : UCOL_GREATER;
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}
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if(leftPrimary == Collation::NO_CE_PRIMARY) { break; }
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}
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if(U_FAILURE(errorCode)) { return UCOL_EQUAL; }
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// Compare the buffered secondary & tertiary weights.
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// We might skip the secondary level but continue with the case level
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// which is turned on separately.
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if(CollationSettings::getStrength(options) >= UCOL_SECONDARY) {
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if((options & CollationSettings::BACKWARD_SECONDARY) == 0) {
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int32_t leftIndex = 0;
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int32_t rightIndex = 0;
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for(;;) {
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uint32_t leftSecondary;
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do {
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leftSecondary = ((uint32_t)left.getCE(leftIndex++)) >> 16;
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} while(leftSecondary == 0);
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uint32_t rightSecondary;
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do {
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rightSecondary = ((uint32_t)right.getCE(rightIndex++)) >> 16;
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} while(rightSecondary == 0);
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if(leftSecondary != rightSecondary) {
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return (leftSecondary < rightSecondary) ? UCOL_LESS : UCOL_GREATER;
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}
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if(leftSecondary == Collation::NO_CE_WEIGHT16) { break; }
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}
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} else {
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// The backwards secondary level compares secondary weights backwards
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// within segments separated by the merge separator (U+FFFE, weight 02).
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int32_t leftStart = 0;
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int32_t rightStart = 0;
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for(;;) {
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// Find the merge separator or the NO_CE terminator.
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uint32_t p;
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int32_t leftLimit = leftStart;
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while((p = (uint32_t)(left.getCE(leftLimit) >> 32)) >
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Collation::MERGE_SEPARATOR_PRIMARY ||
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p == 0) {
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++leftLimit;
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}
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int32_t rightLimit = rightStart;
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while((p = (uint32_t)(right.getCE(rightLimit) >> 32)) >
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Collation::MERGE_SEPARATOR_PRIMARY ||
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p == 0) {
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++rightLimit;
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}
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// Compare the segments.
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int32_t leftIndex = leftLimit;
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int32_t rightIndex = rightLimit;
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for(;;) {
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int32_t leftSecondary = 0;
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while(leftSecondary == 0 && leftIndex > leftStart) {
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leftSecondary = ((uint32_t)left.getCE(--leftIndex)) >> 16;
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}
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int32_t rightSecondary = 0;
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while(rightSecondary == 0 && rightIndex > rightStart) {
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rightSecondary = ((uint32_t)right.getCE(--rightIndex)) >> 16;
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}
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if(leftSecondary != rightSecondary) {
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return (leftSecondary < rightSecondary) ? UCOL_LESS : UCOL_GREATER;
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}
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if(leftSecondary == 0) { break; }
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}
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// Did we reach the end of either string?
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// Both strings have the same number of merge separators,
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// or else there would have been a primary-level difference.
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U_ASSERT(left.getCE(leftLimit) == right.getCE(rightLimit));
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if(p == Collation::NO_CE_PRIMARY) { break; }
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// Skip both merge separators and continue.
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leftStart = leftLimit + 1;
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rightStart = rightLimit + 1;
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}
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}
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}
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if((options & CollationSettings::CASE_LEVEL) != 0) {
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int32_t strength = CollationSettings::getStrength(options);
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int32_t leftIndex = 0;
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int32_t rightIndex = 0;
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for(;;) {
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uint32_t leftCase, leftLower32, rightCase;
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if(strength == UCOL_PRIMARY) {
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// Primary+caseLevel: Ignore case level weights of primary ignorables.
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// Otherwise we would get a-umlaut > a
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// which is not desirable for accent-insensitive sorting.
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// Check for (lower 32 bits) == 0 as well because variable CEs are stored
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// with only primary weights.
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int64_t ce;
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do {
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ce = left.getCE(leftIndex++);
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leftCase = (uint32_t)ce;
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} while((uint32_t)(ce >> 32) == 0 || leftCase == 0);
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leftLower32 = leftCase;
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leftCase &= 0xc000;
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do {
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ce = right.getCE(rightIndex++);
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rightCase = (uint32_t)ce;
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} while((uint32_t)(ce >> 32) == 0 || rightCase == 0);
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rightCase &= 0xc000;
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} else {
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// Secondary+caseLevel: By analogy with the above,
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// ignore case level weights of secondary ignorables.
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//
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// Note: A tertiary CE has uppercase case bits (0.0.ut)
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// to keep tertiary+caseFirst well-formed.
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//
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// Tertiary+caseLevel: Also ignore case level weights of secondary ignorables.
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// Otherwise a tertiary CE's uppercase would be no greater than
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// a primary/secondary CE's uppercase.
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// (See UCA well-formedness condition 2.)
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// We could construct a special case weight higher than uppercase,
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// but it's simpler to always ignore case weights of secondary ignorables,
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// turning 0.0.ut into 0.0.0.t.
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// (See LDML Collation, Case Parameters.)
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do {
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leftCase = (uint32_t)left.getCE(leftIndex++);
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} while(leftCase <= 0xffff);
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leftLower32 = leftCase;
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leftCase &= 0xc000;
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do {
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rightCase = (uint32_t)right.getCE(rightIndex++);
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} while(rightCase <= 0xffff);
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rightCase &= 0xc000;
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}
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// No need to handle NO_CE and MERGE_SEPARATOR specially:
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// There is one case weight for each previous-level weight,
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// so level length differences were handled there.
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if(leftCase != rightCase) {
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if((options & CollationSettings::UPPER_FIRST) == 0) {
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return (leftCase < rightCase) ? UCOL_LESS : UCOL_GREATER;
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} else {
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return (leftCase < rightCase) ? UCOL_GREATER : UCOL_LESS;
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}
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}
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if((leftLower32 >> 16) == Collation::NO_CE_WEIGHT16) { break; }
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}
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}
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if(CollationSettings::getStrength(options) <= UCOL_SECONDARY) { return UCOL_EQUAL; }
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uint32_t tertiaryMask = CollationSettings::getTertiaryMask(options);
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int32_t leftIndex = 0;
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int32_t rightIndex = 0;
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uint32_t anyQuaternaries = 0;
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for(;;) {
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uint32_t leftLower32, leftTertiary;
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do {
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leftLower32 = (uint32_t)left.getCE(leftIndex++);
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anyQuaternaries |= leftLower32;
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U_ASSERT((leftLower32 & Collation::ONLY_TERTIARY_MASK) != 0 ||
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(leftLower32 & 0xc0c0) == 0);
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leftTertiary = leftLower32 & tertiaryMask;
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} while(leftTertiary == 0);
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uint32_t rightLower32, rightTertiary;
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do {
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rightLower32 = (uint32_t)right.getCE(rightIndex++);
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anyQuaternaries |= rightLower32;
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U_ASSERT((rightLower32 & Collation::ONLY_TERTIARY_MASK) != 0 ||
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(rightLower32 & 0xc0c0) == 0);
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rightTertiary = rightLower32 & tertiaryMask;
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} while(rightTertiary == 0);
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if(leftTertiary != rightTertiary) {
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if(CollationSettings::sortsTertiaryUpperCaseFirst(options)) {
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// Pass through NO_CE and keep real tertiary weights larger than that.
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// Do not change the artificial uppercase weight of a tertiary CE (0.0.ut),
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// to keep tertiary CEs well-formed.
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// Their case+tertiary weights must be greater than those of
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// primary and secondary CEs.
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if(leftTertiary > Collation::NO_CE_WEIGHT16) {
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if(leftLower32 > 0xffff) {
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leftTertiary ^= 0xc000;
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} else {
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leftTertiary += 0x4000;
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}
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}
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if(rightTertiary > Collation::NO_CE_WEIGHT16) {
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if(rightLower32 > 0xffff) {
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rightTertiary ^= 0xc000;
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} else {
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rightTertiary += 0x4000;
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}
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}
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}
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return (leftTertiary < rightTertiary) ? UCOL_LESS : UCOL_GREATER;
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}
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if(leftTertiary == Collation::NO_CE_WEIGHT16) { break; }
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}
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if(CollationSettings::getStrength(options) <= UCOL_TERTIARY) { return UCOL_EQUAL; }
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if(!anyVariable && (anyQuaternaries & 0xc0) == 0) {
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// If there are no "variable" CEs and no non-zero quaternary weights,
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// then there are no quaternary differences.
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return UCOL_EQUAL;
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}
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leftIndex = 0;
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rightIndex = 0;
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for(;;) {
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uint32_t leftQuaternary;
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do {
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int64_t ce = left.getCE(leftIndex++);
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leftQuaternary = (uint32_t)ce & 0xffff;
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if(leftQuaternary <= Collation::NO_CE_WEIGHT16) {
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// Variable primary or completely ignorable or NO_CE.
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leftQuaternary = (uint32_t)(ce >> 32);
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} else {
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// Regular CE, not tertiary ignorable.
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// Preserve the quaternary weight in bits 7..6.
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leftQuaternary |= 0xffffff3f;
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}
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} while(leftQuaternary == 0);
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uint32_t rightQuaternary;
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do {
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int64_t ce = right.getCE(rightIndex++);
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rightQuaternary = (uint32_t)ce & 0xffff;
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if(rightQuaternary <= Collation::NO_CE_WEIGHT16) {
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// Variable primary or completely ignorable or NO_CE.
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rightQuaternary = (uint32_t)(ce >> 32);
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} else {
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// Regular CE, not tertiary ignorable.
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// Preserve the quaternary weight in bits 7..6.
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rightQuaternary |= 0xffffff3f;
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}
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} while(rightQuaternary == 0);
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if(leftQuaternary != rightQuaternary) {
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// Return the difference, with script reordering.
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if(settings.hasReordering()) {
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leftQuaternary = settings.reorder(leftQuaternary);
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rightQuaternary = settings.reorder(rightQuaternary);
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}
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return (leftQuaternary < rightQuaternary) ? UCOL_LESS : UCOL_GREATER;
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}
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if(leftQuaternary == Collation::NO_CE_PRIMARY) { break; }
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}
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return UCOL_EQUAL;
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}
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U_NAMESPACE_END
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#endif // !UCONFIG_NO_COLLATION
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