| // © 2016 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| /* |
| ******************************************************************************* |
| * 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 |
| |
| #if defined(STARBOARD) |
| #include "starboard/client_porting/poem/assert_poem.h" |
| #include "starboard/client_porting/poem/string_poem.h" |
| #endif // defined(STARBOARD) |
| #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 |
