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