ICUTextCharacterIterator.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Containers/StringView.h"
#include "Containers/UnrealString.h"
 
#if UE_ENABLE_ICU
 
THIRD_PARTY_INCLUDES_START
    #include <unicode/uchriter.h>
    #include <unicode/schriter.h>
THIRD_PARTY_INCLUDES_END
 
class FICUTextCharacterIterator_NativeUTF16 : public icu::UCharCharacterIterator
{
public:
    explicit FICUTextCharacterIterator_NativeUTF16(FString&& InString);
    explicit FICUTextCharacterIterator_NativeUTF16(FStringView InString);
    virtual ~FICUTextCharacterIterator_NativeUTF16();
 
    int32 InternalIndexToSourceIndex(const int32 InInternalIndex) const;
    int32 SourceIndexToInternalIndex(const int32 InSourceIndex) const;
 
    // ICU RTTI
    static UClassID getStaticClassID();
    virtual UClassID getDynamicClassID() const override;
 
    // Implement icu::CharacterIterator
    virtual icu::CharacterIterator* clone() const override;
 
private:
    FICUTextCharacterIterator_NativeUTF16(const FICUTextCharacterIterator_NativeUTF16& Other);
    FICUTextCharacterIterator_NativeUTF16& operator=(const FICUTextCharacterIterator_NativeUTF16&) = delete;
 
    void SetTextFromStringRef();
 
    FString InternalString;
 
    FStringView StringRef;
};
 
class FICUTextCharacterIterator_ConvertToUnicodeStringPrivate
{
public:
    explicit FICUTextCharacterIterator_ConvertToUnicodeStringPrivate(FString&& InString);
 
protected:
    FICUTextCharacterIterator_ConvertToUnicodeStringPrivate(const FICUTextCharacterIterator_ConvertToUnicodeStringPrivate& Other);
    FICUTextCharacterIterator_ConvertToUnicodeStringPrivate& operator=(const FICUTextCharacterIterator_ConvertToUnicodeStringPrivate&) = delete;
 
    FString SourceString;
 
    icu::UnicodeString InternalString;
};
 
class FICUTextCharacterIterator_ConvertToUnicodeString : private FICUTextCharacterIterator_ConvertToUnicodeStringPrivate, public icu::StringCharacterIterator
{
public:
    explicit FICUTextCharacterIterator_ConvertToUnicodeString(FString&& InString);
    explicit FICUTextCharacterIterator_ConvertToUnicodeString(FStringView InString);
    virtual ~FICUTextCharacterIterator_ConvertToUnicodeString();
 
    int32 InternalIndexToSourceIndex(const int32 InInternalIndex) const;
    int32 SourceIndexToInternalIndex(const int32 InSourceIndex) const;
 
    // ICU RTTI
    static UClassID getStaticClassID();
    virtual UClassID getDynamicClassID() const override;
 
    // Implement icu::CharacterIterator
    virtual icu::CharacterIterator* clone() const override;
 
private:
    FICUTextCharacterIterator_ConvertToUnicodeString(const FICUTextCharacterIterator_ConvertToUnicodeString& Other);
    FICUTextCharacterIterator_ConvertToUnicodeString& operator=(const FICUTextCharacterIterator_ConvertToUnicodeString&) = delete;
};
 
template <bool IsUnicode, size_t TCHARSize> struct FICUTextCharacterIterator_PlatformSpecific { typedef FICUTextCharacterIterator_ConvertToUnicodeString Type; };
template <> struct FICUTextCharacterIterator_PlatformSpecific<true, 2> { typedef FICUTextCharacterIterator_NativeUTF16 Type; }; // A unicode encoding with a wchar_t size of 2 bytes is assumed to be UTF-16
typedef FICUTextCharacterIterator_PlatformSpecific<FPlatformString::IsUnicodeEncoded, sizeof(TCHAR)>::Type FICUTextCharacterIterator;
 
#endif