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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);
-
- virtual int32_t getOffset() const;
-
- virtual UChar32 nextCodePoint(UErrorCode &errorCode);
-
- virtual UChar32 previousCodePoint(UErrorCode &errorCode);
-
-protected:
- virtual uint32_t handleNextCE32(UChar32 &c, UErrorCode &errorCode);
-
- virtual UChar handleGetTrailSurrogate();
-
- virtual void forwardNumCodePoints(int32_t num, UErrorCode &errorCode);
-
- virtual void backwardNumCodePoints(int32_t num, UErrorCode &errorCode);
-
- 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);
-
- virtual int32_t getOffset() const;
-
- virtual UChar32 nextCodePoint(UErrorCode &errorCode);
-
- virtual UChar32 previousCodePoint(UErrorCode &errorCode);
-
-protected:
- virtual uint32_t handleNextCE32(UChar32 &c, UErrorCode &errorCode);
-
- virtual UChar handleGetTrailSurrogate();
-
- virtual void forwardNumCodePoints(int32_t num, UErrorCode &errorCode);
-
- virtual void backwardNumCodePoints(int32_t num, UErrorCode &errorCode);
-
-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__