163 lines
4.7 KiB
C++
163 lines
4.7 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) 2012-2016, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* uitercollationiterator.h
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*
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* created on: 2012sep23 (from utf16collationiterator.h)
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* created by: Markus W. Scherer
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*/
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#ifndef __UITERCOLLATIONITERATOR_H__
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#define __UITERCOLLATIONITERATOR_H__
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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 "cmemory.h"
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#include "collation.h"
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#include "collationdata.h"
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#include "collationiterator.h"
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#include "normalizer2impl.h"
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U_NAMESPACE_BEGIN
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/**
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* UCharIterator-based collation element and character iterator.
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* Handles normalized text inline, with length or NUL-terminated.
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* Unnormalized text is handled by a subclass.
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*/
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class U_I18N_API UIterCollationIterator : public CollationIterator {
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public:
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UIterCollationIterator(const CollationData *d, UBool numeric, UCharIterator &ui)
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: CollationIterator(d, numeric), iter(ui) {}
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virtual ~UIterCollationIterator();
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virtual void resetToOffset(int32_t newOffset) override;
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virtual int32_t getOffset() const override;
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virtual UChar32 nextCodePoint(UErrorCode &errorCode) override;
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virtual UChar32 previousCodePoint(UErrorCode &errorCode) override;
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protected:
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virtual uint32_t handleNextCE32(UChar32 &c, UErrorCode &errorCode) override;
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virtual UChar handleGetTrailSurrogate() override;
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virtual void forwardNumCodePoints(int32_t num, UErrorCode &errorCode) override;
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virtual void backwardNumCodePoints(int32_t num, UErrorCode &errorCode) override;
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UCharIterator &iter;
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};
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/**
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* Incrementally checks the input text for FCD and normalizes where necessary.
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*/
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class U_I18N_API FCDUIterCollationIterator : public UIterCollationIterator {
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public:
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FCDUIterCollationIterator(const CollationData *data, UBool numeric, UCharIterator &ui, int32_t startIndex)
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: UIterCollationIterator(data, numeric, ui),
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state(ITER_CHECK_FWD), start(startIndex),
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nfcImpl(data->nfcImpl) {}
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virtual ~FCDUIterCollationIterator();
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virtual void resetToOffset(int32_t newOffset) override;
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virtual int32_t getOffset() const override;
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virtual UChar32 nextCodePoint(UErrorCode &errorCode) override;
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virtual UChar32 previousCodePoint(UErrorCode &errorCode) override;
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protected:
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virtual uint32_t handleNextCE32(UChar32 &c, UErrorCode &errorCode) override;
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virtual UChar handleGetTrailSurrogate() override;
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virtual void forwardNumCodePoints(int32_t num, UErrorCode &errorCode) override;
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virtual void backwardNumCodePoints(int32_t num, UErrorCode &errorCode) override;
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private:
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/**
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* Switches to forward checking if possible.
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*/
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void switchToForward();
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/**
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* Extends the FCD text segment forward or normalizes around pos.
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* @return true if success
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*/
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UBool nextSegment(UErrorCode &errorCode);
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/**
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* Switches to backward checking.
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*/
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void switchToBackward();
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/**
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* Extends the FCD text segment backward or normalizes around pos.
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* @return true if success
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*/
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UBool previousSegment(UErrorCode &errorCode);
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UBool normalize(const UnicodeString &s, UErrorCode &errorCode);
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enum State {
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/**
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* The input text [start..(iter index)[ passes the FCD check.
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* Moving forward checks incrementally.
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* pos & limit are undefined.
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*/
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ITER_CHECK_FWD,
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/**
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* The input text [(iter index)..limit[ passes the FCD check.
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* Moving backward checks incrementally.
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* start & pos are undefined.
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*/
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ITER_CHECK_BWD,
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/**
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* The input text [start..limit[ passes the FCD check.
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* pos tracks the current text index.
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*/
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ITER_IN_FCD_SEGMENT,
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/**
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* The input text [start..limit[ failed the FCD check and was normalized.
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* pos tracks the current index in the normalized string.
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* The text iterator is at the limit index.
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*/
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IN_NORM_ITER_AT_LIMIT,
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/**
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* The input text [start..limit[ failed the FCD check and was normalized.
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* pos tracks the current index in the normalized string.
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* The text iterator is at the start index.
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*/
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IN_NORM_ITER_AT_START
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};
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State state;
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int32_t start;
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int32_t pos;
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int32_t limit;
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const Normalizer2Impl &nfcImpl;
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UnicodeString normalized;
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};
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U_NAMESPACE_END
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#endif // !UCONFIG_NO_COLLATION
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#endif // __UITERCOLLATIONITERATOR_H__
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