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-// © 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.h
-*
-* created on: 2010oct27
-* created by: Markus W. Scherer
-*/
-
-#ifndef __UTF16COLLATIONITERATOR_H__
-#define __UTF16COLLATIONITERATOR_H__
-
-#include "unicode/utypes.h"
-
-#if !UCONFIG_NO_COLLATION
-
-#include "cmemory.h"
-#include "collation.h"
-#include "collationdata.h"
-#include "collationiterator.h"
-#include "normalizer2impl.h"
-
-U_NAMESPACE_BEGIN
-
-/**
- * UTF-16 collation element and character iterator.
- * Handles normalized UTF-16 text inline, with length or NUL-terminated.
- * Unnormalized text is handled by a subclass.
- */
-class U_I18N_API UTF16CollationIterator : public CollationIterator {
-public:
- UTF16CollationIterator(const CollationData *d, UBool numeric,
- const UChar *s, const UChar *p, const UChar *lim)
- : CollationIterator(d, numeric),
- start(s), pos(p), limit(lim) {}
-
- UTF16CollationIterator(const UTF16CollationIterator &other, const UChar *newText);
-
- virtual ~UTF16CollationIterator();
-
- virtual UBool operator==(const CollationIterator &other) const;
-
- virtual void resetToOffset(int32_t newOffset);
-
- virtual int32_t getOffset() const;
-
- void setText(const UChar *s, const UChar *lim) {
- reset();
- start = pos = s;
- limit = lim;
- }
-
- virtual UChar32 nextCodePoint(UErrorCode &errorCode);
-
- virtual UChar32 previousCodePoint(UErrorCode &errorCode);
-
-protected:
- // Copy constructor only for subclasses which set the pointers.
- UTF16CollationIterator(const UTF16CollationIterator &other)
- : CollationIterator(other),
- start(NULL), pos(NULL), limit(NULL) {}
-
- virtual uint32_t handleNextCE32(UChar32 &c, UErrorCode &errorCode);
-
- virtual UChar handleGetTrailSurrogate();
-
- virtual UBool foundNULTerminator();
-
- virtual void forwardNumCodePoints(int32_t num, UErrorCode &errorCode);
-
- virtual void backwardNumCodePoints(int32_t num, UErrorCode &errorCode);
-
- // UTF-16 string pointers.
- // limit can be NULL for NUL-terminated strings.
- const UChar *start, *pos, *limit;
-};
-
-/**
- * Incrementally checks the input text for FCD and normalizes where necessary.
- */
-class U_I18N_API FCDUTF16CollationIterator : public UTF16CollationIterator {
-public:
- FCDUTF16CollationIterator(const CollationData *data, UBool numeric,
- const UChar *s, const UChar *p, const UChar *lim)
- : UTF16CollationIterator(data, numeric, s, p, lim),
- rawStart(s), segmentStart(p), segmentLimit(NULL), rawLimit(lim),
- nfcImpl(data->nfcImpl),
- checkDir(1) {}
-
- FCDUTF16CollationIterator(const FCDUTF16CollationIterator &other, const UChar *newText);
-
- virtual ~FCDUTF16CollationIterator();
-
- virtual UBool operator==(const CollationIterator &other) const;
-
- 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 UBool foundNULTerminator();
-
- virtual void forwardNumCodePoints(int32_t num, UErrorCode &errorCode);
-
- virtual void backwardNumCodePoints(int32_t num, UErrorCode &errorCode);
-
-private:
- /**
- * Switches to forward checking if possible.
- * To be called when checkDir < 0 || (checkDir == 0 && pos == limit).
- * Returns with checkDir > 0 || (checkDir == 0 && pos != limit).
- */
- void switchToForward();
-
- /**
- * Extend the FCD text segment forward or normalize around pos.
- * To be called when checkDir > 0 && pos != limit.
- * @return TRUE if success, checkDir == 0 and pos != limit
- */
- UBool nextSegment(UErrorCode &errorCode);
-
- /**
- * Switches to backward checking.
- * To be called when checkDir > 0 || (checkDir == 0 && pos == start).
- * Returns with checkDir < 0 || (checkDir == 0 && pos != start).
- */
- void switchToBackward();
-
- /**
- * Extend the FCD text segment backward or normalize around pos.
- * To be called when checkDir < 0 && pos != start.
- * @return TRUE if success, checkDir == 0 and pos != start
- */
- UBool previousSegment(UErrorCode &errorCode);
-
- UBool normalize(const UChar *from, const UChar *to, UErrorCode &errorCode);
-
- // Text pointers: The input text is [rawStart, rawLimit[
- // where rawLimit can be NULL for NUL-terminated text.
- //
- // checkDir > 0:
- //
- // The input text [segmentStart..pos[ passes the FCD check.
- // Moving forward checks incrementally.
- // segmentLimit is undefined. limit == rawLimit.
- //
- // checkDir < 0:
- // The input text [pos..segmentLimit[ passes the FCD check.
- // Moving backward checks incrementally.
- // segmentStart is undefined, start == rawStart.
- //
- // checkDir == 0:
- //
- // The input text [segmentStart..segmentLimit[ is being processed.
- // These pointers are at FCD boundaries.
- // Either this text segment already passes the FCD check
- // and segmentStart==start<=pos<=limit==segmentLimit,
- // or the current segment had to be normalized so that
- // [segmentStart..segmentLimit[ turned into the normalized string,
- // corresponding to normalized.getBuffer()==start<=pos<=limit==start+normalized.length().
- const UChar *rawStart;
- const UChar *segmentStart;
- const UChar *segmentLimit;
- // rawLimit==NULL for a NUL-terminated string.
- const UChar *rawLimit;
-
- const Normalizer2Impl &nfcImpl;
- UnicodeString normalized;
- // Direction of incremental FCD check. See comments before rawStart.
- int8_t checkDir;
-};
-
-U_NAMESPACE_END
-
-#endif // !UCONFIG_NO_COLLATION
-#endif // __UTF16COLLATIONITERATOR_H__