451 lines
14 KiB
C++
451 lines
14 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) 2012-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* uitercollationiterator.cpp
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*
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* created on: 2012sep23 (from utf16collationiterator.cpp)
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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/uiter.h"
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#include "charstr.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 "collationfcd.h"
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#include "collationiterator.h"
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#include "normalizer2impl.h"
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#include "uassert.h"
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#include "uitercollationiterator.h"
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U_NAMESPACE_BEGIN
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UIterCollationIterator::~UIterCollationIterator() {}
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void
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UIterCollationIterator::resetToOffset(int32_t newOffset) {
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reset();
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iter.move(&iter, newOffset, UITER_START);
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}
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int32_t
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UIterCollationIterator::getOffset() const {
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return iter.getIndex(&iter, UITER_CURRENT);
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}
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uint32_t
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UIterCollationIterator::handleNextCE32(UChar32 &c, UErrorCode & /*errorCode*/) {
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c = iter.next(&iter);
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if(c < 0) {
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return Collation::FALLBACK_CE32;
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}
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return UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c);
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}
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UChar
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UIterCollationIterator::handleGetTrailSurrogate() {
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UChar32 trail = iter.next(&iter);
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if(!U16_IS_TRAIL(trail) && trail >= 0) { iter.previous(&iter); }
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return (UChar)trail;
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}
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UChar32
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UIterCollationIterator::nextCodePoint(UErrorCode & /*errorCode*/) {
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return uiter_next32(&iter);
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}
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UChar32
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UIterCollationIterator::previousCodePoint(UErrorCode & /*errorCode*/) {
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return uiter_previous32(&iter);
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}
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void
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UIterCollationIterator::forwardNumCodePoints(int32_t num, UErrorCode & /*errorCode*/) {
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while(num > 0 && (uiter_next32(&iter)) >= 0) {
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--num;
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}
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}
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void
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UIterCollationIterator::backwardNumCodePoints(int32_t num, UErrorCode & /*errorCode*/) {
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while(num > 0 && (uiter_previous32(&iter)) >= 0) {
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--num;
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}
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}
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// FCDUIterCollationIterator ----------------------------------------------- ***
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FCDUIterCollationIterator::~FCDUIterCollationIterator() {}
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void
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FCDUIterCollationIterator::resetToOffset(int32_t newOffset) {
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UIterCollationIterator::resetToOffset(newOffset);
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start = newOffset;
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state = ITER_CHECK_FWD;
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}
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int32_t
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FCDUIterCollationIterator::getOffset() const {
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if(state <= ITER_CHECK_BWD) {
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return iter.getIndex(&iter, UITER_CURRENT);
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} else if(state == ITER_IN_FCD_SEGMENT) {
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return pos;
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} else if(pos == 0) {
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return start;
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} else {
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return limit;
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}
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}
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uint32_t
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FCDUIterCollationIterator::handleNextCE32(UChar32 &c, UErrorCode &errorCode) {
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for(;;) {
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if(state == ITER_CHECK_FWD) {
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c = iter.next(&iter);
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if(c < 0) {
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return Collation::FALLBACK_CE32;
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}
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if(CollationFCD::hasTccc(c)) {
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if(CollationFCD::maybeTibetanCompositeVowel(c) ||
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CollationFCD::hasLccc(iter.current(&iter))) {
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iter.previous(&iter);
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if(!nextSegment(errorCode)) {
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c = U_SENTINEL;
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return Collation::FALLBACK_CE32;
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}
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continue;
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}
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}
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break;
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} else if(state == ITER_IN_FCD_SEGMENT && pos != limit) {
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c = iter.next(&iter);
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++pos;
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U_ASSERT(c >= 0);
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break;
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} else if(state >= IN_NORM_ITER_AT_LIMIT && pos != normalized.length()) {
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c = normalized[pos++];
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break;
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} else {
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switchToForward();
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}
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}
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return UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c);
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}
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UChar
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FCDUIterCollationIterator::handleGetTrailSurrogate() {
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if(state <= ITER_IN_FCD_SEGMENT) {
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UChar32 trail = iter.next(&iter);
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if(U16_IS_TRAIL(trail)) {
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if(state == ITER_IN_FCD_SEGMENT) { ++pos; }
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} else if(trail >= 0) {
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iter.previous(&iter);
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}
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return (UChar)trail;
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} else {
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U_ASSERT(pos < normalized.length());
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UChar trail;
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if(U16_IS_TRAIL(trail = normalized[pos])) { ++pos; }
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return trail;
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}
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}
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UChar32
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FCDUIterCollationIterator::nextCodePoint(UErrorCode &errorCode) {
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UChar32 c;
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for(;;) {
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if(state == ITER_CHECK_FWD) {
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c = iter.next(&iter);
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if(c < 0) {
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return c;
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}
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if(CollationFCD::hasTccc(c)) {
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if(CollationFCD::maybeTibetanCompositeVowel(c) ||
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CollationFCD::hasLccc(iter.current(&iter))) {
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iter.previous(&iter);
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if(!nextSegment(errorCode)) {
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return U_SENTINEL;
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}
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continue;
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}
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}
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if(U16_IS_LEAD(c)) {
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UChar32 trail = iter.next(&iter);
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if(U16_IS_TRAIL(trail)) {
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return U16_GET_SUPPLEMENTARY(c, trail);
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} else if(trail >= 0) {
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iter.previous(&iter);
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}
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}
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return c;
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} else if(state == ITER_IN_FCD_SEGMENT && pos != limit) {
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c = uiter_next32(&iter);
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pos += U16_LENGTH(c);
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U_ASSERT(c >= 0);
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return c;
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} else if(state >= IN_NORM_ITER_AT_LIMIT && pos != normalized.length()) {
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c = normalized.char32At(pos);
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pos += U16_LENGTH(c);
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return c;
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} else {
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switchToForward();
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}
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}
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}
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UChar32
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FCDUIterCollationIterator::previousCodePoint(UErrorCode &errorCode) {
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UChar32 c;
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for(;;) {
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if(state == ITER_CHECK_BWD) {
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c = iter.previous(&iter);
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if(c < 0) {
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start = pos = 0;
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state = ITER_IN_FCD_SEGMENT;
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return U_SENTINEL;
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}
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if(CollationFCD::hasLccc(c)) {
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UChar32 prev = U_SENTINEL;
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if(CollationFCD::maybeTibetanCompositeVowel(c) ||
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CollationFCD::hasTccc(prev = iter.previous(&iter))) {
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iter.next(&iter);
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if(prev >= 0) {
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iter.next(&iter);
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}
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if(!previousSegment(errorCode)) {
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return U_SENTINEL;
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}
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continue;
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}
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// hasLccc(trail)=true for all trail surrogates
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if(U16_IS_TRAIL(c)) {
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if(prev < 0) {
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prev = iter.previous(&iter);
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}
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if(U16_IS_LEAD(prev)) {
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return U16_GET_SUPPLEMENTARY(prev, c);
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}
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}
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if(prev >= 0) {
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iter.next(&iter);
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}
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}
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return c;
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} else if(state == ITER_IN_FCD_SEGMENT && pos != start) {
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c = uiter_previous32(&iter);
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pos -= U16_LENGTH(c);
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U_ASSERT(c >= 0);
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return c;
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} else if(state >= IN_NORM_ITER_AT_LIMIT && pos != 0) {
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c = normalized.char32At(pos - 1);
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pos -= U16_LENGTH(c);
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return c;
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} else {
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switchToBackward();
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}
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}
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}
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void
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FCDUIterCollationIterator::forwardNumCodePoints(int32_t num, UErrorCode &errorCode) {
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// Specify the class to avoid a virtual-function indirection.
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// In Java, we would declare this class final.
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while(num > 0 && FCDUIterCollationIterator::nextCodePoint(errorCode) >= 0) {
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--num;
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}
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}
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void
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FCDUIterCollationIterator::backwardNumCodePoints(int32_t num, UErrorCode &errorCode) {
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// Specify the class to avoid a virtual-function indirection.
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// In Java, we would declare this class final.
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while(num > 0 && FCDUIterCollationIterator::previousCodePoint(errorCode) >= 0) {
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--num;
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}
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}
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void
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FCDUIterCollationIterator::switchToForward() {
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U_ASSERT(state == ITER_CHECK_BWD ||
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(state == ITER_IN_FCD_SEGMENT && pos == limit) ||
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(state >= IN_NORM_ITER_AT_LIMIT && pos == normalized.length()));
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if(state == ITER_CHECK_BWD) {
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// Turn around from backward checking.
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start = pos = iter.getIndex(&iter, UITER_CURRENT);
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if(pos == limit) {
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state = ITER_CHECK_FWD; // Check forward.
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} else { // pos < limit
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state = ITER_IN_FCD_SEGMENT; // Stay in FCD segment.
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}
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} else {
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// Reached the end of the FCD segment.
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if(state == ITER_IN_FCD_SEGMENT) {
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// The input text segment is FCD, extend it forward.
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} else {
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// The input text segment needed to be normalized.
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// Switch to checking forward from it.
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if(state == IN_NORM_ITER_AT_START) {
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iter.move(&iter, limit - start, UITER_CURRENT);
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}
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start = limit;
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}
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state = ITER_CHECK_FWD;
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}
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}
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UBool
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FCDUIterCollationIterator::nextSegment(UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return FALSE; }
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U_ASSERT(state == ITER_CHECK_FWD);
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// The input text [start..(iter index)[ passes the FCD check.
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pos = iter.getIndex(&iter, UITER_CURRENT);
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// Collect the characters being checked, in case they need to be normalized.
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UnicodeString s;
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uint8_t prevCC = 0;
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for(;;) {
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// Fetch the next character and its fcd16 value.
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UChar32 c = uiter_next32(&iter);
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if(c < 0) { break; }
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uint16_t fcd16 = nfcImpl.getFCD16(c);
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uint8_t leadCC = (uint8_t)(fcd16 >> 8);
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if(leadCC == 0 && !s.isEmpty()) {
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// FCD boundary before this character.
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uiter_previous32(&iter);
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break;
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}
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s.append(c);
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if(leadCC != 0 && (prevCC > leadCC || CollationFCD::isFCD16OfTibetanCompositeVowel(fcd16))) {
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// Fails FCD check. Find the next FCD boundary and normalize.
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for(;;) {
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c = uiter_next32(&iter);
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if(c < 0) { break; }
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if(nfcImpl.getFCD16(c) <= 0xff) {
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uiter_previous32(&iter);
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break;
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}
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s.append(c);
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}
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if(!normalize(s, errorCode)) { return FALSE; }
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start = pos;
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limit = pos + s.length();
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state = IN_NORM_ITER_AT_LIMIT;
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pos = 0;
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return TRUE;
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}
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prevCC = (uint8_t)fcd16;
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if(prevCC == 0) {
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// FCD boundary after the last character.
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break;
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}
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}
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limit = pos + s.length();
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U_ASSERT(pos != limit);
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iter.move(&iter, -s.length(), UITER_CURRENT);
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state = ITER_IN_FCD_SEGMENT;
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return TRUE;
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}
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void
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FCDUIterCollationIterator::switchToBackward() {
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U_ASSERT(state == ITER_CHECK_FWD ||
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(state == ITER_IN_FCD_SEGMENT && pos == start) ||
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(state >= IN_NORM_ITER_AT_LIMIT && pos == 0));
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if(state == ITER_CHECK_FWD) {
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// Turn around from forward checking.
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limit = pos = iter.getIndex(&iter, UITER_CURRENT);
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if(pos == start) {
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state = ITER_CHECK_BWD; // Check backward.
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} else { // pos > start
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state = ITER_IN_FCD_SEGMENT; // Stay in FCD segment.
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}
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} else {
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// Reached the start of the FCD segment.
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if(state == ITER_IN_FCD_SEGMENT) {
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// The input text segment is FCD, extend it backward.
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} else {
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// The input text segment needed to be normalized.
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// Switch to checking backward from it.
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if(state == IN_NORM_ITER_AT_LIMIT) {
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iter.move(&iter, start - limit, UITER_CURRENT);
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}
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limit = start;
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}
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state = ITER_CHECK_BWD;
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}
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}
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UBool
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FCDUIterCollationIterator::previousSegment(UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) { return FALSE; }
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U_ASSERT(state == ITER_CHECK_BWD);
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// The input text [(iter index)..limit[ passes the FCD check.
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pos = iter.getIndex(&iter, UITER_CURRENT);
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// Collect the characters being checked, in case they need to be normalized.
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UnicodeString s;
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uint8_t nextCC = 0;
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for(;;) {
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// Fetch the previous character and its fcd16 value.
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UChar32 c = uiter_previous32(&iter);
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if(c < 0) { break; }
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uint16_t fcd16 = nfcImpl.getFCD16(c);
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uint8_t trailCC = (uint8_t)fcd16;
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if(trailCC == 0 && !s.isEmpty()) {
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// FCD boundary after this character.
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uiter_next32(&iter);
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break;
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}
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s.append(c);
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if(trailCC != 0 && ((nextCC != 0 && trailCC > nextCC) ||
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CollationFCD::isFCD16OfTibetanCompositeVowel(fcd16))) {
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// Fails FCD check. Find the previous FCD boundary and normalize.
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while(fcd16 > 0xff) {
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c = uiter_previous32(&iter);
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if(c < 0) { break; }
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fcd16 = nfcImpl.getFCD16(c);
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if(fcd16 == 0) {
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(void)uiter_next32(&iter);
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break;
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}
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s.append(c);
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}
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s.reverse();
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if(!normalize(s, errorCode)) { return FALSE; }
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limit = pos;
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start = pos - s.length();
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state = IN_NORM_ITER_AT_START;
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pos = normalized.length();
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return TRUE;
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}
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nextCC = (uint8_t)(fcd16 >> 8);
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if(nextCC == 0) {
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// FCD boundary before the following character.
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break;
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}
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}
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start = pos - s.length();
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U_ASSERT(pos != start);
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iter.move(&iter, s.length(), UITER_CURRENT);
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state = ITER_IN_FCD_SEGMENT;
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return TRUE;
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}
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UBool
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FCDUIterCollationIterator::normalize(const UnicodeString &s, UErrorCode &errorCode) {
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// NFD without argument checking.
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U_ASSERT(U_SUCCESS(errorCode));
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nfcImpl.decompose(s, normalized, errorCode);
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return U_SUCCESS(errorCode);
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}
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U_NAMESPACE_END
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#endif // !UCONFIG_NO_COLLATION
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