CamelCaseBreakIterator.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Array.h"
#include "Containers/ContainerAllocationPolicies.h"
#include "Containers/StringFwd.h"
#include "Containers/StringView.h"
#include "Containers/UnrealString.h"
#include "CoreTypes.h"
#include "Internationalization/IBreakIterator.h"
 
class FCamelCaseBreakIterator : public IBreakIterator
{
public:
    FCamelCaseBreakIterator();
 
    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:
    enum class ETokenType : uint8
    {
        Uppercase,
        Lowercase,
        Digit,
        Null,
        Other,
    };
 
    struct FToken
    {
        FToken(const ETokenType InTokenType, const int32 InStrIndex)
            : TokenType(InTokenType)
            , StrIndex(InStrIndex)
        {
        }
 
        ETokenType TokenType;
        int32 StrIndex;
    };
 
    using FTokensArray = TArray<FToken, TInlineAllocator<1024>>;
    virtual void TokenizeString(FTokensArray& OutTokens) = 0;
 
protected:
    void UpdateBreakPointsArray();
    void PopulateBreakPointsArray(const FTokensArray& InTokens);
 
    FString InternalString;
    FStringView String;
    int32 CurrentPosition;
    TArray<int32, TInlineAllocator<32>> BreakPoints;
};