EM_Task/CoreUObject/Private/UObject/FieldPathProperty.cpp

// Copyright Epic Games, Inc. All Rights Reserved.

#include "UObject/FieldPathProperty.h"
#include "UObject/PropertyPortFlags.h"
#include "UObject/Package.h"
#include "UObject/UnrealTypePrivate.h"
#include "UObject/LinkerLoad.h"
#include "UObject/ConstructorHelpers.h"
#include "Misc/Parse.h"
#include "UObject/PropertyHelper.h"

// WARNING: This should always be the last include in any file that needs it (except .generated.h)
#include "UObject/UndefineUPropertyMacros.h"

IMPLEMENT_FIELD(FFieldPathProperty)

#if WITH_EDITORONLY_DATA
FFieldPathProperty::FFieldPathProperty(UField* InField)
    : FFieldPathProperty_Super(InField), PropertyClass(nullptr)
{
    check(InField);
    PropertyClass = FFieldClass::GetNameToFieldClassMap().FindRef(InField->GetClass()->GetFName());
}
#endif  // WITH_EDITORONLY_DATA

EConvertFromTypeResult FFieldPathProperty::ConvertFromType(const FPropertyTag& Tag, FStructuredArchive::FSlot Slot, uint8* Data, UStruct* DefaultsStruct)
{
    // Convert UProperty object to TFieldPath
    if (Tag.Type == NAME_ObjectProperty)
    {
        FArchive& UnderlyingArchive = Slot.GetUnderlyingArchive();
        check(UnderlyingArchive.IsLoading() && UnderlyingArchive.IsPersistent());
        FLinker* Linker = UnderlyingArchive.GetLinker();
        check(Linker);

        FFieldPath ConvertedValue;

        FPackageIndex Index;
        UnderlyingArchive << Index;

        bool bExport = Index.IsExport();
        while (!Index.IsNull())
        {
            const FObjectResource& Res = Linker->ImpExp(Index);
            ConvertedValue.Path.Add(Res.ObjectName);
            Index = Res.OuterIndex;
        }
        if (bExport)
        {
            check(Linker->LinkerRoot);
            ConvertedValue.Path.Add(Linker->LinkerRoot->GetFName());
        }
        if (ConvertedValue.Path.Num())
        {
            ConvertedValue.ConvertFromFullPath(Cast<FLinkerLoad>(Linker));
        }

        SetPropertyValue_InContainer(Data, ConvertedValue, Tag.ArrayIndex);
        return EConvertFromTypeResult::Converted;
    }

    return EConvertFromTypeResult::UseSerializeItem;
}

bool FFieldPathProperty::Identical(const void* A, const void* B, uint32 PortFlags) const
{
    const FFieldPath ValueA = GetPropertyValue(A);
    if (B)
    {
        const FFieldPath ValueB = GetPropertyValue(B);
        return ValueA == ValueB;
    }

    return !ValueA.GetTyped(FField::StaticClass());
}

void FFieldPathProperty::SerializeItem(FStructuredArchive::FSlot Slot, void* Value, void const* Defaults) const
{
    FFieldPath* FieldPtr = GetPropertyValuePtr(Value);
    Slot << *FieldPtr;
}

void FFieldPathProperty::ExportTextItem(FString& ValueStr, const void* PropertyValue, const void* DefaultValue, UObject* Parent, int32 PortFlags, UObject* ExportRootScope) const
{
    const FFieldPath& Value = GetPropertyValue(PropertyValue);

    if (PortFlags & PPF_ExportCpp)
    {
        ValueStr += TEXT("TEXT(\"");
        ValueStr += Value.ToString();
        ValueStr += TEXT("\")");
    }
    else if (PortFlags & PPF_PropertyWindow)
    {
        if (PortFlags & PPF_Delimited)
        {
            ValueStr += TEXT("\"");
            ValueStr += Value.ToString();
            ValueStr += TEXT("\"");
        }
        else
        {
            ValueStr += Value.ToString();
        }
    }
    else
    {
        ValueStr += Value.ToString();
    }
}

const TCHAR* FFieldPathProperty::ImportText_Internal(const TCHAR* Buffer, void* Data, int32 PortFlags, UObject* Parent, FOutputDevice* ErrorText) const
{
    check(Buffer);
    FFieldPath* PathPtr = GetPropertyValuePtr(Data);
    check(PathPtr);
    FString PathName;

    if (!(PortFlags & PPF_Delimited))
    {
        PathName = Buffer;
        // in order to indicate that the value was successfully imported, advance the buffer past the last character that was imported
        Buffer += PathName.Len();
    }
    else
    {
        // Advance to the next delimiter (comma) or the end of the buffer
        int32 SeparatorIndex = 0;
        while (Buffer[SeparatorIndex] != '\0' && Buffer[SeparatorIndex] != ',' && Buffer[SeparatorIndex] != ')')
        {
            ++SeparatorIndex;
        }
        // Copy the value string
        PathName = FString(SeparatorIndex, Buffer);
        // Advance the buffer to let the calling function know we succeeded
        Buffer += SeparatorIndex;
    }

    if (PathName.Len())
    {
        // Strip the class name if present, we don't need it
        ConstructorHelpers::StripObjectClass(PathName);
        if (PathName[0] == '\"')
        {
            FString UnquotedPathName;
            if (!FParse::QuotedString(*PathName, UnquotedPathName))
            {
                UE_LOG(LogProperty, Warning, TEXT("FieldPathProperty: Bad quoted string: %s"), *PathName);
                return nullptr;
            }
            PathName = MoveTemp(UnquotedPathName);
        }
        PathPtr->Generate(*PathName);
    }

    return Buffer;
}

void FFieldPathProperty::Serialize(FArchive& Ar)
{
    Super::Serialize(Ar);
    Ar << PropertyClass;
}

FString FFieldPathProperty::GetCPPMacroType(FString& ExtendedTypeText) const
{
    check(PropertyClass);
    ExtendedTypeText = FString::Printf(TEXT("TFieldPath<F%s>"), *PropertyClass->GetName());
    return TEXT("STRUCT");
}

FString FFieldPathProperty::GetCPPTypeForwardDeclaration() const
{
    check(PropertyClass);
    return FString::Printf(TEXT("class F%s;"), *PropertyClass->GetName());
}

FString FFieldPathProperty::GetCPPType(FString* ExtendedTypeText, uint32 CPPExportFlags) const
{
    checkSlow(PropertyClass);
    if (ExtendedTypeText != nullptr)
    {
        FString& InnerTypeText = *ExtendedTypeText;
        InnerTypeText          = TEXT("<F");
        InnerTypeText += PropertyClass->GetName();
        InnerTypeText += TEXT(">");
    }
    return TEXT("TFieldPath");
}

bool FFieldPathProperty::SupportsNetSharedSerialization() const
{
    return false;
}

#include "UObject/DefineUPropertyMacros.h"