| // © 2016 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| /* |
| ******************************************************************************* |
| * Copyright (C) 2012-2014, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ******************************************************************************* |
| * uitercollationiterator.cpp |
| * |
| * created on: 2012sep23 (from utf16collationiterator.cpp) |
| * created by: Markus W. Scherer |
| */ |
| |
| #include "unicode/utypes.h" |
| |
| #if !UCONFIG_NO_COLLATION |
| |
| #include "unicode/uiter.h" |
| #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 "uitercollationiterator.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| UIterCollationIterator::~UIterCollationIterator() {} |
| |
| void |
| UIterCollationIterator::resetToOffset(int32_t newOffset) { |
| reset(); |
| iter.move(&iter, newOffset, UITER_START); |
| } |
| |
| int32_t |
| UIterCollationIterator::getOffset() const { |
| return iter.getIndex(&iter, UITER_CURRENT); |
| } |
| |
| uint32_t |
| UIterCollationIterator::handleNextCE32(UChar32 &c, UErrorCode & /*errorCode*/) { |
| c = iter.next(&iter); |
| if(c < 0) { |
| return Collation::FALLBACK_CE32; |
| } |
| return UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c); |
| } |
| |
| UChar |
| UIterCollationIterator::handleGetTrailSurrogate() { |
| UChar32 trail = iter.next(&iter); |
| if(!U16_IS_TRAIL(trail) && trail >= 0) { iter.previous(&iter); } |
| return (UChar)trail; |
| } |
| |
| UChar32 |
| UIterCollationIterator::nextCodePoint(UErrorCode & /*errorCode*/) { |
| return uiter_next32(&iter); |
| } |
| |
| UChar32 |
| UIterCollationIterator::previousCodePoint(UErrorCode & /*errorCode*/) { |
| return uiter_previous32(&iter); |
| } |
| |
| void |
| UIterCollationIterator::forwardNumCodePoints(int32_t num, UErrorCode & /*errorCode*/) { |
| while(num > 0 && (uiter_next32(&iter)) >= 0) { |
| --num; |
| } |
| } |
| |
| void |
| UIterCollationIterator::backwardNumCodePoints(int32_t num, UErrorCode & /*errorCode*/) { |
| while(num > 0 && (uiter_previous32(&iter)) >= 0) { |
| --num; |
| } |
| } |
| |
| // FCDUIterCollationIterator ----------------------------------------------- *** |
| |
| FCDUIterCollationIterator::~FCDUIterCollationIterator() {} |
| |
| void |
| FCDUIterCollationIterator::resetToOffset(int32_t newOffset) { |
| UIterCollationIterator::resetToOffset(newOffset); |
| start = newOffset; |
| state = ITER_CHECK_FWD; |
| } |
| |
| int32_t |
| FCDUIterCollationIterator::getOffset() const { |
| if(state <= ITER_CHECK_BWD) { |
| return iter.getIndex(&iter, UITER_CURRENT); |
| } else if(state == ITER_IN_FCD_SEGMENT) { |
| return pos; |
| } else if(pos == 0) { |
| return start; |
| } else { |
| return limit; |
| } |
| } |
| |
| uint32_t |
| FCDUIterCollationIterator::handleNextCE32(UChar32 &c, UErrorCode &errorCode) { |
| for(;;) { |
| if(state == ITER_CHECK_FWD) { |
| c = iter.next(&iter); |
| if(c < 0) { |
| return Collation::FALLBACK_CE32; |
| } |
| if(CollationFCD::hasTccc(c)) { |
| if(CollationFCD::maybeTibetanCompositeVowel(c) || |
| CollationFCD::hasLccc(iter.current(&iter))) { |
| iter.previous(&iter); |
| if(!nextSegment(errorCode)) { |
| c = U_SENTINEL; |
| return Collation::FALLBACK_CE32; |
| } |
| continue; |
| } |
| } |
| break; |
| } else if(state == ITER_IN_FCD_SEGMENT && pos != limit) { |
| c = iter.next(&iter); |
| ++pos; |
| U_ASSERT(c >= 0); |
| break; |
| } else if(state >= IN_NORM_ITER_AT_LIMIT && pos != normalized.length()) { |
| c = normalized[pos++]; |
| break; |
| } else { |
| switchToForward(); |
| } |
| } |
| return UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c); |
| } |
| |
| UChar |
| FCDUIterCollationIterator::handleGetTrailSurrogate() { |
| if(state <= ITER_IN_FCD_SEGMENT) { |
| UChar32 trail = iter.next(&iter); |
| if(U16_IS_TRAIL(trail)) { |
| if(state == ITER_IN_FCD_SEGMENT) { ++pos; } |
| } else if(trail >= 0) { |
| iter.previous(&iter); |
| } |
| return (UChar)trail; |
| } else { |
| U_ASSERT(pos < normalized.length()); |
| UChar trail; |
| if(U16_IS_TRAIL(trail = normalized[pos])) { ++pos; } |
| return trail; |
| } |
| } |
| |
| UChar32 |
| FCDUIterCollationIterator::nextCodePoint(UErrorCode &errorCode) { |
| UChar32 c; |
| for(;;) { |
| if(state == ITER_CHECK_FWD) { |
| c = iter.next(&iter); |
| if(c < 0) { |
| return c; |
| } |
| if(CollationFCD::hasTccc(c)) { |
| if(CollationFCD::maybeTibetanCompositeVowel(c) || |
| CollationFCD::hasLccc(iter.current(&iter))) { |
| iter.previous(&iter); |
| if(!nextSegment(errorCode)) { |
| return U_SENTINEL; |
| } |
| continue; |
| } |
| } |
| if(U16_IS_LEAD(c)) { |
| UChar32 trail = iter.next(&iter); |
| if(U16_IS_TRAIL(trail)) { |
| return U16_GET_SUPPLEMENTARY(c, trail); |
| } else if(trail >= 0) { |
| iter.previous(&iter); |
| } |
| } |
| return c; |
| } else if(state == ITER_IN_FCD_SEGMENT && pos != limit) { |
| c = uiter_next32(&iter); |
| pos += U16_LENGTH(c); |
| U_ASSERT(c >= 0); |
| return c; |
| } else if(state >= IN_NORM_ITER_AT_LIMIT && pos != normalized.length()) { |
| c = normalized.char32At(pos); |
| pos += U16_LENGTH(c); |
| return c; |
| } else { |
| switchToForward(); |
| } |
| } |
| } |
| |
| UChar32 |
| FCDUIterCollationIterator::previousCodePoint(UErrorCode &errorCode) { |
| UChar32 c; |
| for(;;) { |
| if(state == ITER_CHECK_BWD) { |
| c = iter.previous(&iter); |
| if(c < 0) { |
| start = pos = 0; |
| state = ITER_IN_FCD_SEGMENT; |
| return U_SENTINEL; |
| } |
| if(CollationFCD::hasLccc(c)) { |
| UChar32 prev = U_SENTINEL; |
| if(CollationFCD::maybeTibetanCompositeVowel(c) || |
| CollationFCD::hasTccc(prev = iter.previous(&iter))) { |
| iter.next(&iter); |
| if(prev >= 0) { |
| iter.next(&iter); |
| } |
| if(!previousSegment(errorCode)) { |
| return U_SENTINEL; |
| } |
| continue; |
| } |
| // hasLccc(trail)=true for all trail surrogates |
| if(U16_IS_TRAIL(c)) { |
| if(prev < 0) { |
| prev = iter.previous(&iter); |
| } |
| if(U16_IS_LEAD(prev)) { |
| return U16_GET_SUPPLEMENTARY(prev, c); |
| } |
| } |
| if(prev >= 0) { |
| iter.next(&iter); |
| } |
| } |
| return c; |
| } else if(state == ITER_IN_FCD_SEGMENT && pos != start) { |
| c = uiter_previous32(&iter); |
| pos -= U16_LENGTH(c); |
| U_ASSERT(c >= 0); |
| return c; |
| } else if(state >= IN_NORM_ITER_AT_LIMIT && pos != 0) { |
| c = normalized.char32At(pos - 1); |
| pos -= U16_LENGTH(c); |
| return c; |
| } else { |
| switchToBackward(); |
| } |
| } |
| } |
| |
| void |
| FCDUIterCollationIterator::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 && FCDUIterCollationIterator::nextCodePoint(errorCode) >= 0) { |
| --num; |
| } |
| } |
| |
| void |
| FCDUIterCollationIterator::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 && FCDUIterCollationIterator::previousCodePoint(errorCode) >= 0) { |
| --num; |
| } |
| } |
| |
| void |
| FCDUIterCollationIterator::switchToForward() { |
| U_ASSERT(state == ITER_CHECK_BWD || |
| (state == ITER_IN_FCD_SEGMENT && pos == limit) || |
| (state >= IN_NORM_ITER_AT_LIMIT && pos == normalized.length())); |
| if(state == ITER_CHECK_BWD) { |
| // Turn around from backward checking. |
| start = pos = iter.getIndex(&iter, UITER_CURRENT); |
| if(pos == limit) { |
| state = ITER_CHECK_FWD; // Check forward. |
| } else { // pos < limit |
| state = ITER_IN_FCD_SEGMENT; // Stay in FCD segment. |
| } |
| } else { |
| // Reached the end of the FCD segment. |
| if(state == ITER_IN_FCD_SEGMENT) { |
| // The input text segment is FCD, extend it forward. |
| } else { |
| // The input text segment needed to be normalized. |
| // Switch to checking forward from it. |
| if(state == IN_NORM_ITER_AT_START) { |
| iter.move(&iter, limit - start, UITER_CURRENT); |
| } |
| start = limit; |
| } |
| state = ITER_CHECK_FWD; |
| } |
| } |
| |
| UBool |
| FCDUIterCollationIterator::nextSegment(UErrorCode &errorCode) { |
| if(U_FAILURE(errorCode)) { return FALSE; } |
| U_ASSERT(state == ITER_CHECK_FWD); |
| // The input text [start..(iter index)[ passes the FCD check. |
| pos = iter.getIndex(&iter, UITER_CURRENT); |
| // Collect the characters being checked, in case they need to be normalized. |
| UnicodeString s; |
| uint8_t prevCC = 0; |
| for(;;) { |
| // Fetch the next character and its fcd16 value. |
| UChar32 c = uiter_next32(&iter); |
| if(c < 0) { break; } |
| uint16_t fcd16 = nfcImpl.getFCD16(c); |
| uint8_t leadCC = (uint8_t)(fcd16 >> 8); |
| if(leadCC == 0 && !s.isEmpty()) { |
| // FCD boundary before this character. |
| uiter_previous32(&iter); |
| break; |
| } |
| s.append(c); |
| if(leadCC != 0 && (prevCC > leadCC || CollationFCD::isFCD16OfTibetanCompositeVowel(fcd16))) { |
| // Fails FCD check. Find the next FCD boundary and normalize. |
| for(;;) { |
| c = uiter_next32(&iter); |
| if(c < 0) { break; } |
| if(nfcImpl.getFCD16(c) <= 0xff) { |
| uiter_previous32(&iter); |
| break; |
| } |
| s.append(c); |
| } |
| if(!normalize(s, errorCode)) { return FALSE; } |
| start = pos; |
| limit = pos + s.length(); |
| state = IN_NORM_ITER_AT_LIMIT; |
| pos = 0; |
| return TRUE; |
| } |
| prevCC = (uint8_t)fcd16; |
| if(prevCC == 0) { |
| // FCD boundary after the last character. |
| break; |
| } |
| } |
| limit = pos + s.length(); |
| U_ASSERT(pos != limit); |
| iter.move(&iter, -s.length(), UITER_CURRENT); |
| state = ITER_IN_FCD_SEGMENT; |
| return TRUE; |
| } |
| |
| void |
| FCDUIterCollationIterator::switchToBackward() { |
| U_ASSERT(state == ITER_CHECK_FWD || |
| (state == ITER_IN_FCD_SEGMENT && pos == start) || |
| (state >= IN_NORM_ITER_AT_LIMIT && pos == 0)); |
| if(state == ITER_CHECK_FWD) { |
| // Turn around from forward checking. |
| limit = pos = iter.getIndex(&iter, UITER_CURRENT); |
| if(pos == start) { |
| state = ITER_CHECK_BWD; // Check backward. |
| } else { // pos > start |
| state = ITER_IN_FCD_SEGMENT; // Stay in FCD segment. |
| } |
| } else { |
| // Reached the start of the FCD segment. |
| if(state == ITER_IN_FCD_SEGMENT) { |
| // The input text segment is FCD, extend it backward. |
| } else { |
| // The input text segment needed to be normalized. |
| // Switch to checking backward from it. |
| if(state == IN_NORM_ITER_AT_LIMIT) { |
| iter.move(&iter, start - limit, UITER_CURRENT); |
| } |
| limit = start; |
| } |
| state = ITER_CHECK_BWD; |
| } |
| } |
| |
| UBool |
| FCDUIterCollationIterator::previousSegment(UErrorCode &errorCode) { |
| if(U_FAILURE(errorCode)) { return FALSE; } |
| U_ASSERT(state == ITER_CHECK_BWD); |
| // The input text [(iter index)..limit[ passes the FCD check. |
| pos = iter.getIndex(&iter, UITER_CURRENT); |
| // Collect the characters being checked, in case they need to be normalized. |
| UnicodeString s; |
| uint8_t nextCC = 0; |
| for(;;) { |
| // Fetch the previous character and its fcd16 value. |
| UChar32 c = uiter_previous32(&iter); |
| if(c < 0) { break; } |
| uint16_t fcd16 = nfcImpl.getFCD16(c); |
| uint8_t trailCC = (uint8_t)fcd16; |
| if(trailCC == 0 && !s.isEmpty()) { |
| // FCD boundary after this character. |
| uiter_next32(&iter); |
| break; |
| } |
| s.append(c); |
| if(trailCC != 0 && ((nextCC != 0 && trailCC > nextCC) || |
| CollationFCD::isFCD16OfTibetanCompositeVowel(fcd16))) { |
| // Fails FCD check. Find the previous FCD boundary and normalize. |
| while(fcd16 > 0xff) { |
| c = uiter_previous32(&iter); |
| if(c < 0) { break; } |
| fcd16 = nfcImpl.getFCD16(c); |
| if(fcd16 == 0) { |
| (void)uiter_next32(&iter); |
| break; |
| } |
| s.append(c); |
| } |
| s.reverse(); |
| if(!normalize(s, errorCode)) { return FALSE; } |
| limit = pos; |
| start = pos - s.length(); |
| state = IN_NORM_ITER_AT_START; |
| pos = normalized.length(); |
| return TRUE; |
| } |
| nextCC = (uint8_t)(fcd16 >> 8); |
| if(nextCC == 0) { |
| // FCD boundary before the following character. |
| break; |
| } |
| } |
| start = pos - s.length(); |
| U_ASSERT(pos != start); |
| iter.move(&iter, s.length(), UITER_CURRENT); |
| state = ITER_IN_FCD_SEGMENT; |
| return TRUE; |
| } |
| |
| UBool |
| FCDUIterCollationIterator::normalize(const UnicodeString &s, UErrorCode &errorCode) { |
| // NFD without argument checking. |
| U_ASSERT(U_SUCCESS(errorCode)); |
| nfcImpl.decompose(s, normalized, errorCode); |
| return U_SUCCESS(errorCode); |
| } |
| |
| U_NAMESPACE_END |
| |
| #endif // !UCONFIG_NO_COLLATION |
