DlgJsonWriter.h

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// Copyright Csaba Molnar, Daniel Butum. All Rights Reserved.
#pragma once
 
#include "Logging/LogMacros.h"
#include "UObject/UnrealType.h"
#include "Misc/FileHelper.h"
#include "Dom/JsonValue.h"
#include "Dom/JsonObject.h"
 
#include "IDlgWriter.h"
 
DECLARE_LOG_CATEGORY_EXTERN(LogDlgJsonWriter, All, All);
 
 
struct DLGSYSTEM_API DlgJsonWriterOptions
{
    int32 InitialIndent = 0;
    bool bPrettyPrint = true;
};
 
class DLGSYSTEM_API FDlgJsonWriter : public IDlgWriter
{
public:
 
    FDlgJsonWriter() {};
 
    // IDlgWriter Interface
    void Write(const UStruct* StructDefinition, const void* ContainerPtr) override;
 
    bool ExportToFile(const FString& FileName) override
    {
        return FFileHelper::SaveStringToFile(JsonString, *FileName, FFileHelper::EEncodingOptions::ForceUTF8WithoutBOM);
    }
 
    const FString& GetAsString() const override
    {
        return JsonString;
    }
 
private: // UStruct -> JSON
    TSharedPtr<FJsonValue> ConvertScalarPropertyToJsonValue(const FNYProperty* Property, const void* const ContainerPtr, const void* const ValuePtr);
 
    TSharedPtr<FJsonValue> PropertyToJsonValue(const FNYProperty* Property, const void* const ContainerPtr, const void* const ValuePtr);
 
    bool UStructToJsonAttributes(const UStruct* StructDefinition, const void* const ContainerPtr,
                                 TMap<FString, TSharedPtr<FJsonValue>>& OutJsonAttributes);
 
    bool UStructToJsonObject(const UStruct* StructDefinition, const void* const ContainerPtr, TSharedRef<FJsonObject>& OutJsonObject)
    {
        return UStructToJsonAttributes(StructDefinition, ContainerPtr, OutJsonObject->Values);
    }
 
    bool UStructToJsonString(const UStruct* StructDefinition, const void* const ContainerPtr, const DlgJsonWriterOptions& Options,
                             FString& OutJsonString);
 
    void ResetState()
    {
        IndexInArray = INDEX_NONE;
        bIsPropertyMapKey = false;
    }
 
private:
    // Final output string
    FString JsonString;
 
    static constexpr int64 CheckFlags = ~CPF_ParmFlags; // all properties except those who have these flags? TODO is this ok?
 
    // Used when parsing
 
    // If it is in an array this is != INDEX_NONE
    int32 IndexInArray = INDEX_NONE;
 
    // Is the current property used as a map key?
    bool bIsPropertyMapKey = false;
};