--- /dev/null
+/*
+*******************************************************************************
+* Copyright (C) 2010-2014, International Business Machines
+* Corporation and others. All Rights Reserved.
+*******************************************************************************
+* utf16collationiterator.cpp
+*
+* created on: 2010oct27
+* created by: Markus W. Scherer
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+#include "charstr.h"
+#include "cmemory.h"
+#include "collation.h"
+#include "collationdata.h"
+#include "collationfcd.h"
+#include "collationiterator.h"
+#include "normalizer2impl.h"
+#include "uassert.h"
+#include "utf16collationiterator.h"
+
+U_NAMESPACE_BEGIN
+
+UTF16CollationIterator::UTF16CollationIterator(const UTF16CollationIterator &other,
+ const UChar *newText)
+ : CollationIterator(other),
+ start(newText),
+ pos(newText + (other.pos - other.start)),
+ limit(other.limit == NULL ? NULL : newText + (other.limit - other.start)) {
+}
+
+UTF16CollationIterator::~UTF16CollationIterator() {}
+
+UBool
+UTF16CollationIterator::operator==(const CollationIterator &other) const {
+ if(!CollationIterator::operator==(other)) { return FALSE; }
+ const UTF16CollationIterator &o = static_cast<const UTF16CollationIterator &>(other);
+ // Compare the iterator state but not the text: Assume that the caller does that.
+ return (pos - start) == (o.pos - o.start);
+}
+
+void
+UTF16CollationIterator::resetToOffset(int32_t newOffset) {
+ reset();
+ pos = start + newOffset;
+}
+
+int32_t
+UTF16CollationIterator::getOffset() const {
+ return (int32_t)(pos - start);
+}
+
+uint32_t
+UTF16CollationIterator::handleNextCE32(UChar32 &c, UErrorCode & /*errorCode*/) {
+ if(pos == limit) {
+ c = U_SENTINEL;
+ return Collation::FALLBACK_CE32;
+ }
+ c = *pos++;
+ return UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c);
+}
+
+UChar
+UTF16CollationIterator::handleGetTrailSurrogate() {
+ if(pos == limit) { return 0; }
+ UChar trail;
+ if(U16_IS_TRAIL(trail = *pos)) { ++pos; }
+ return trail;
+}
+
+UBool
+UTF16CollationIterator::foundNULTerminator() {
+ if(limit == NULL) {
+ limit = --pos;
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+UChar32
+UTF16CollationIterator::nextCodePoint(UErrorCode & /*errorCode*/) {
+ if(pos == limit) {
+ return U_SENTINEL;
+ }
+ UChar32 c = *pos;
+ if(c == 0 && limit == NULL) {
+ limit = pos;
+ return U_SENTINEL;
+ }
+ ++pos;
+ UChar trail;
+ if(U16_IS_LEAD(c) && pos != limit && U16_IS_TRAIL(trail = *pos)) {
+ ++pos;
+ return U16_GET_SUPPLEMENTARY(c, trail);
+ } else {
+ return c;
+ }
+}
+
+UChar32
+UTF16CollationIterator::previousCodePoint(UErrorCode & /*errorCode*/) {
+ if(pos == start) {
+ return U_SENTINEL;
+ }
+ UChar32 c = *--pos;
+ UChar lead;
+ if(U16_IS_TRAIL(c) && pos != start && U16_IS_LEAD(lead = *(pos - 1))) {
+ --pos;
+ return U16_GET_SUPPLEMENTARY(lead, c);
+ } else {
+ return c;
+ }
+}
+
+void
+UTF16CollationIterator::forwardNumCodePoints(int32_t num, UErrorCode & /*errorCode*/) {
+ while(num > 0 && pos != limit) {
+ UChar32 c = *pos;
+ if(c == 0 && limit == NULL) {
+ limit = pos;
+ break;
+ }
+ ++pos;
+ --num;
+ if(U16_IS_LEAD(c) && pos != limit && U16_IS_TRAIL(*pos)) {
+ ++pos;
+ }
+ }
+}
+
+void
+UTF16CollationIterator::backwardNumCodePoints(int32_t num, UErrorCode & /*errorCode*/) {
+ while(num > 0 && pos != start) {
+ UChar32 c = *--pos;
+ --num;
+ if(U16_IS_TRAIL(c) && pos != start && U16_IS_LEAD(*(pos-1))) {
+ --pos;
+ }
+ }
+}
+
+// FCDUTF16CollationIterator ----------------------------------------------- ***
+
+FCDUTF16CollationIterator::FCDUTF16CollationIterator(const FCDUTF16CollationIterator &other,
+ const UChar *newText)
+ : UTF16CollationIterator(other),
+ rawStart(newText),
+ segmentStart(newText + (other.segmentStart - other.rawStart)),
+ segmentLimit(other.segmentLimit == NULL ? NULL : newText + (other.segmentLimit - other.rawStart)),
+ rawLimit(other.rawLimit == NULL ? NULL : newText + (other.rawLimit - other.rawStart)),
+ nfcImpl(other.nfcImpl),
+ normalized(other.normalized),
+ checkDir(other.checkDir) {
+ if(checkDir != 0 || other.start == other.segmentStart) {
+ start = newText + (other.start - other.rawStart);
+ pos = newText + (other.pos - other.rawStart);
+ limit = other.limit == NULL ? NULL : newText + (other.limit - other.rawStart);
+ } else {
+ start = normalized.getBuffer();
+ pos = start + (other.pos - other.start);
+ limit = start + normalized.length();
+ }
+}
+
+FCDUTF16CollationIterator::~FCDUTF16CollationIterator() {}
+
+UBool
+FCDUTF16CollationIterator::operator==(const CollationIterator &other) const {
+ // Skip the UTF16CollationIterator and call its parent.
+ if(!CollationIterator::operator==(other)) { return FALSE; }
+ const FCDUTF16CollationIterator &o = static_cast<const FCDUTF16CollationIterator &>(other);
+ // Compare the iterator state but not the text: Assume that the caller does that.
+ if(checkDir != o.checkDir) { return FALSE; }
+ if(checkDir == 0 && (start == segmentStart) != (o.start == o.segmentStart)) { return FALSE; }
+ if(checkDir != 0 || start == segmentStart) {
+ return (pos - rawStart) == (o.pos - o.rawStart);
+ } else {
+ return (segmentStart - rawStart) == (o.segmentStart - o.rawStart) &&
+ (pos - start) == (o.pos - o.start);
+ }
+}
+
+void
+FCDUTF16CollationIterator::resetToOffset(int32_t newOffset) {
+ reset();
+ start = segmentStart = pos = rawStart + newOffset;
+ limit = rawLimit;
+ checkDir = 1;
+}
+
+int32_t
+FCDUTF16CollationIterator::getOffset() const {
+ if(checkDir != 0 || start == segmentStart) {
+ return (int32_t)(pos - rawStart);
+ } else if(pos == start) {
+ return (int32_t)(segmentStart - rawStart);
+ } else {
+ return (int32_t)(segmentLimit - rawStart);
+ }
+}
+
+uint32_t
+FCDUTF16CollationIterator::handleNextCE32(UChar32 &c, UErrorCode &errorCode) {
+ for(;;) {
+ if(checkDir > 0) {
+ if(pos == limit) {
+ c = U_SENTINEL;
+ return Collation::FALLBACK_CE32;
+ }
+ c = *pos++;
+ if(CollationFCD::hasTccc(c)) {
+ if(CollationFCD::maybeTibetanCompositeVowel(c) ||
+ (pos != limit && CollationFCD::hasLccc(*pos))) {
+ --pos;
+ if(!nextSegment(errorCode)) {
+ c = U_SENTINEL;
+ return Collation::FALLBACK_CE32;
+ }
+ c = *pos++;
+ }
+ }
+ break;
+ } else if(checkDir == 0 && pos != limit) {
+ c = *pos++;
+ break;
+ } else {
+ switchToForward();
+ }
+ }
+ return UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c);
+}
+
+UBool
+FCDUTF16CollationIterator::foundNULTerminator() {
+ if(limit == NULL) {
+ limit = rawLimit = --pos;
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+UChar32
+FCDUTF16CollationIterator::nextCodePoint(UErrorCode &errorCode) {
+ UChar32 c;
+ for(;;) {
+ if(checkDir > 0) {
+ if(pos == limit) {
+ return U_SENTINEL;
+ }
+ c = *pos++;
+ if(CollationFCD::hasTccc(c)) {
+ if(CollationFCD::maybeTibetanCompositeVowel(c) ||
+ (pos != limit && CollationFCD::hasLccc(*pos))) {
+ --pos;
+ if(!nextSegment(errorCode)) {
+ return U_SENTINEL;
+ }
+ c = *pos++;
+ }
+ } else if(c == 0 && limit == NULL) {
+ limit = rawLimit = --pos;
+ return U_SENTINEL;
+ }
+ break;
+ } else if(checkDir == 0 && pos != limit) {
+ c = *pos++;
+ break;
+ } else {
+ switchToForward();
+ }
+ }
+ UChar trail;
+ if(U16_IS_LEAD(c) && pos != limit && U16_IS_TRAIL(trail = *pos)) {
+ ++pos;
+ return U16_GET_SUPPLEMENTARY(c, trail);
+ } else {
+ return c;
+ }
+}
+
+UChar32
+FCDUTF16CollationIterator::previousCodePoint(UErrorCode &errorCode) {
+ UChar32 c;
+ for(;;) {
+ if(checkDir < 0) {
+ if(pos == start) {
+ return U_SENTINEL;
+ }
+ c = *--pos;
+ if(CollationFCD::hasLccc(c)) {
+ if(CollationFCD::maybeTibetanCompositeVowel(c) ||
+ (pos != start && CollationFCD::hasTccc(*(pos - 1)))) {
+ ++pos;
+ if(!previousSegment(errorCode)) {
+ return U_SENTINEL;
+ }
+ c = *--pos;
+ }
+ }
+ break;
+ } else if(checkDir == 0 && pos != start) {
+ c = *--pos;
+ break;
+ } else {
+ switchToBackward();
+ }
+ }
+ UChar lead;
+ if(U16_IS_TRAIL(c) && pos != start && U16_IS_LEAD(lead = *(pos - 1))) {
+ --pos;
+ return U16_GET_SUPPLEMENTARY(lead, c);
+ } else {
+ return c;
+ }
+}
+
+void
+FCDUTF16CollationIterator::forwardNumCodePoints(int32_t num, UErrorCode &errorCode) {
+ // Specify the class to avoid a virtual-function indirection.
+ // In Java, we would declare this class final.
+ while(num > 0 && FCDUTF16CollationIterator::nextCodePoint(errorCode) >= 0) {
+ --num;
+ }
+}
+
+void
+FCDUTF16CollationIterator::backwardNumCodePoints(int32_t num, UErrorCode &errorCode) {
+ // Specify the class to avoid a virtual-function indirection.
+ // In Java, we would declare this class final.
+ while(num > 0 && FCDUTF16CollationIterator::previousCodePoint(errorCode) >= 0) {
+ --num;
+ }
+}
+
+void
+FCDUTF16CollationIterator::switchToForward() {
+ U_ASSERT(checkDir < 0 || (checkDir == 0 && pos == limit));
+ if(checkDir < 0) {
+ // Turn around from backward checking.
+ start = segmentStart = pos;
+ if(pos == segmentLimit) {
+ limit = rawLimit;
+ checkDir = 1; // Check forward.
+ } else { // pos < segmentLimit
+ checkDir = 0; // Stay in FCD segment.
+ }
+ } else {
+ // Reached the end of the FCD segment.
+ if(start == segmentStart) {
+ // The input text segment is FCD, extend it forward.
+ } else {
+ // The input text segment needed to be normalized.
+ // Switch to checking forward from it.
+ pos = start = segmentStart = segmentLimit;
+ // Note: If this segment is at the end of the input text,
+ // then it might help to return FALSE to indicate that, so that
+ // we do not have to re-check and normalize when we turn around and go backwards.
+ // However, that would complicate the call sites for an optimization of an unusual case.
+ }
+ limit = rawLimit;
+ checkDir = 1;
+ }
+}
+
+UBool
+FCDUTF16CollationIterator::nextSegment(UErrorCode &errorCode) {
+ if(U_FAILURE(errorCode)) { return FALSE; }
+ U_ASSERT(checkDir > 0 && pos != limit);
+ // The input text [segmentStart..pos[ passes the FCD check.
+ const UChar *p = pos;
+ uint8_t prevCC = 0;
+ for(;;) {
+ // Fetch the next character's fcd16 value.
+ const UChar *q = p;
+ uint16_t fcd16 = nfcImpl.nextFCD16(p, rawLimit);
+ uint8_t leadCC = (uint8_t)(fcd16 >> 8);
+ if(leadCC == 0 && q != pos) {
+ // FCD boundary before the [q, p[ character.
+ limit = segmentLimit = q;
+ break;
+ }
+ if(leadCC != 0 && (prevCC > leadCC || CollationFCD::isFCD16OfTibetanCompositeVowel(fcd16))) {
+ // Fails FCD check. Find the next FCD boundary and normalize.
+ do {
+ q = p;
+ } while(p != rawLimit && nfcImpl.nextFCD16(p, rawLimit) > 0xff);
+ if(!normalize(pos, q, errorCode)) { return FALSE; }
+ pos = start;
+ break;
+ }
+ prevCC = (uint8_t)fcd16;
+ if(p == rawLimit || prevCC == 0) {
+ // FCD boundary after the last character.
+ limit = segmentLimit = p;
+ break;
+ }
+ }
+ U_ASSERT(pos != limit);
+ checkDir = 0;
+ return TRUE;
+}
+
+void
+FCDUTF16CollationIterator::switchToBackward() {
+ U_ASSERT(checkDir > 0 || (checkDir == 0 && pos == start));
+ if(checkDir > 0) {
+ // Turn around from forward checking.
+ limit = segmentLimit = pos;
+ if(pos == segmentStart) {
+ start = rawStart;
+ checkDir = -1; // Check backward.
+ } else { // pos > segmentStart
+ checkDir = 0; // Stay in FCD segment.
+ }
+ } else {
+ // Reached the start of the FCD segment.
+ if(start == segmentStart) {
+ // The input text segment is FCD, extend it backward.
+ } else {
+ // The input text segment needed to be normalized.
+ // Switch to checking backward from it.
+ pos = limit = segmentLimit = segmentStart;
+ }
+ start = rawStart;
+ checkDir = -1;
+ }
+}
+
+UBool
+FCDUTF16CollationIterator::previousSegment(UErrorCode &errorCode) {
+ if(U_FAILURE(errorCode)) { return FALSE; }
+ U_ASSERT(checkDir < 0 && pos != start);
+ // The input text [pos..segmentLimit[ passes the FCD check.
+ const UChar *p = pos;
+ uint8_t nextCC = 0;
+ for(;;) {
+ // Fetch the previous character's fcd16 value.
+ const UChar *q = p;
+ uint16_t fcd16 = nfcImpl.previousFCD16(rawStart, p);
+ uint8_t trailCC = (uint8_t)fcd16;
+ if(trailCC == 0 && q != pos) {
+ // FCD boundary after the [p, q[ character.
+ start = segmentStart = q;
+ break;
+ }
+ if(trailCC != 0 && ((nextCC != 0 && trailCC > nextCC) ||
+ CollationFCD::isFCD16OfTibetanCompositeVowel(fcd16))) {
+ // Fails FCD check. Find the previous FCD boundary and normalize.
+ do {
+ q = p;
+ } while(fcd16 > 0xff && p != rawStart &&
+ (fcd16 = nfcImpl.previousFCD16(rawStart, p)) != 0);
+ if(!normalize(q, pos, errorCode)) { return FALSE; }
+ pos = limit;
+ break;
+ }
+ nextCC = (uint8_t)(fcd16 >> 8);
+ if(p == rawStart || nextCC == 0) {
+ // FCD boundary before the following character.
+ start = segmentStart = p;
+ break;
+ }
+ }
+ U_ASSERT(pos != start);
+ checkDir = 0;
+ return TRUE;
+}
+
+UBool
+FCDUTF16CollationIterator::normalize(const UChar *from, const UChar *to, UErrorCode &errorCode) {
+ // NFD without argument checking.
+ U_ASSERT(U_SUCCESS(errorCode));
+ nfcImpl.decompose(from, to, normalized, (int32_t)(to - from), errorCode);
+ if(U_FAILURE(errorCode)) { return FALSE; }
+ // Switch collation processing into the FCD buffer
+ // with the result of normalizing [segmentStart, segmentLimit[.
+ segmentStart = from;
+ segmentLimit = to;
+ start = normalized.getBuffer();
+ limit = start + normalized.length();
+ return TRUE;
+}
+
+U_NAMESPACE_END
+
+#endif // !UCONFIG_NO_COLLATION
projects / apple / icu.git / blobdiff