ICUBreakIterator.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Containers/Set.h"
#include "Templates/SharedPointer.h"
#include "Internationalization/IBreakIterator.h"
 
#if UE_ENABLE_ICU
 
THIRD_PARTY_INCLUDES_START
    #include <unicode/brkiter.h>
THIRD_PARTY_INCLUDES_END
 
class FICUBreakIteratorManager
{
public:
    static void Create();
    static void Destroy();
    static bool IsInitialized();
    static FICUBreakIteratorManager& Get();
 
    TWeakPtr<icu::BreakIterator> CreateCharacterBoundaryIterator();
    TWeakPtr<icu::BreakIterator> CreateWordBreakIterator();
    TWeakPtr<icu::BreakIterator> CreateLineBreakIterator();
    void DestroyIterator(TWeakPtr<icu::BreakIterator>& InIterator);
 
private:
    static FICUBreakIteratorManager* Singleton;
    FCriticalSection AllocatedIteratorsCS;
    TSet<TSharedPtr<icu::BreakIterator>> AllocatedIterators;
};
 
class FICUBreakIterator : public IBreakIterator
{
public:
    FICUBreakIterator(TWeakPtr<icu::BreakIterator>&& InICUBreakIteratorHandle);
    virtual ~FICUBreakIterator();
 
    virtual void SetString(FString&& InString) override;
    virtual void SetStringRef(FStringView InString) override;
 
    virtual int32 GetCurrentPosition() const override;
 
    virtual int32 ResetToBeginning() override;
    virtual int32 ResetToEnd() override;
 
    virtual int32 MoveToPrevious() override;
    virtual int32 MoveToNext() override;
    virtual int32 MoveToCandidateBefore(const int32 InIndex) override;
    virtual int32 MoveToCandidateAfter(const int32 InIndex) override;
 
protected:
    TSharedRef<icu::BreakIterator> GetInternalBreakIterator() const;
 
private:
    TWeakPtr<icu::BreakIterator> ICUBreakIteratorHandle;
};
 
#endif