JsonPrintPolicy.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Utf8String.h"
#include "CoreMinimal.h"
 
template <class InCharType>
struct TJsonPrintPolicy
{
    using CharType = InCharType;
 
    static inline void WriteChar( FArchive* Stream, CharType Char )
    {
        Stream->Serialize(&Char, sizeof(CharType));
    }
 
    static inline void WriteString(FArchive* Stream, FStringView String)
    {
        auto Conv = StringCast<CharType>(String.GetData(), String.Len());
        Stream->Serialize((void*)Conv.Get(), Conv.Length() * sizeof(CharType));
    }
 
    static inline void WriteString(FArchive* Stream, FUtf8StringView String)
    {
        auto Conv = StringCast<CharType>(String.GetData(), String.Len());
        Stream->Serialize((void*)Conv.Get(), Conv.Length() * sizeof(CharType));
    }
 
    static inline void WriteFloat( FArchive* Stream, float Value )
    {
        WriteString(Stream, FString::Printf(TEXT("%g"), Value));
    }
 
    static inline void WriteDouble(  FArchive* Stream, double Value )
    {
        // Specify 17 significant digits, the most that can ever be useful from a double
        // In particular, this ensures large integers are written correctly
        WriteString(Stream, FString::Printf(TEXT("%.17g"), Value));
    }
};
 
 
#if !PLATFORM_TCHAR_IS_CHAR16
 
template <>
inline void TJsonPrintPolicy<UTF16CHAR>::WriteString(FArchive* Stream, FStringView String)
{
    // Note: This is a no-op on platforms that are using a 16-bit TCHAR
    FTCHARToUTF16 UTF16String(String.GetData(), String.Len());
 
    Stream->Serialize((void*)UTF16String.Get(), UTF16String.Length() * sizeof(UTF16CHAR));
}
 
#endif