RTL custom interface types as records
This commit is contained in:
Michael Schimmel
@@ -0,0 +1,385 @@
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unit Myc.Ast.RTL.TypeRegistry;
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interface
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uses
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System.SysUtils,
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System.Classes,
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System.Rtti,
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System.TypInfo,
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System.Generics.Collections,
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Myc.Data.Value,
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Myc.Data.Scalar,
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Myc.Data.Keyword,
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Myc.Ast.Types,
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Myc.Ast.Scope,
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Myc.Ast.RTL;
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type
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EInteropException = class(Exception);
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ERecursionException = class(EInteropException);
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// Factory delegate for Interfaces
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TInterfaceFactoryDelegate<T: IInterface> = reference to function(const Args: TArray<TDataValue>): T;
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// Central registry mapping Delphi Interfaces to AST static types and handling
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// runtime wrapping (Shadow Records).
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TRtlTypeRegistry = class
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private
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class var
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FCtx: TRttiContext;
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FKnownTypes: TDictionary<PTypeInfo, IStaticType>;
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FAnalysisStack: TList<PTypeInfo>;
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// --- Analysis ---
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class function AnalyzeType(ATypeInfo: PTypeInfo): IStaticType; static;
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class function GenerateInterfaceDefinition(RType: TRttiInterfaceType): IStaticType; static;
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class procedure EnterAnalysis(Info: PTypeInfo); static;
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class procedure ExitAnalysis(Info: PTypeInfo); static;
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// --- Marshalling ---
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class function ToTValue(const AData: TDataValue; ATargetType: TRttiType): TValue; static;
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class function FromTValue(const AValue: TValue): TDataValue; static;
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// --- Wrapping ---
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class function WrapInstance(const Instance: IInterface; TypeInfo: PTypeInfo): TDataValue; static;
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public
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class constructor Create;
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class destructor Destroy;
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// --- Registration ---
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// Registers a Delphi Interface type. Raises ERecursionException on cycles.
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class procedure RegisterType<T: IInterface>; overload;
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class procedure RegisterType(Info: PTypeInfo); overload;
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// --- Factories ---
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// Registers a factory function. T must be registered via RegisterType<T> first.
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class procedure RegisterFactory<T: IInterface>(
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const Scope: IExecutionScope;
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const FactoryName: string;
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const FactoryArgs: TArray<IStaticType>;
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const FactoryDelegate: TInterfaceFactoryDelegate<T>
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);
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// --- Resolution ---
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class function GetStaticType(Info: PTypeInfo): IStaticType;
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class function ResolveType(RType: TRttiType): IStaticType;
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class property Context: TRttiContext read FCtx;
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end;
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implementation
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uses
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Myc.Ast.RTL.Core;
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{ TRtlTypeRegistry }
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class constructor TRtlTypeRegistry.Create;
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begin
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FCtx := TRttiContext.Create;
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FKnownTypes := TDictionary<PTypeInfo, IStaticType>.Create;
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FAnalysisStack := TList<PTypeInfo>.Create;
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end;
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class destructor TRtlTypeRegistry.Destroy;
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begin
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FAnalysisStack.Free;
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FKnownTypes.Free;
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FCtx.Free;
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end;
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// -----------------------------------------------------------------------------
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// Type Analysis
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// -----------------------------------------------------------------------------
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class procedure TRtlTypeRegistry.EnterAnalysis(Info: PTypeInfo);
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begin
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if FAnalysisStack.Contains(Info) then
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raise ERecursionException.CreateFmt('Recursive type definition detected for "%s".', [string(Info.Name)]);
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FAnalysisStack.Add(Info);
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end;
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class procedure TRtlTypeRegistry.ExitAnalysis(Info: PTypeInfo);
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begin
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FAnalysisStack.Remove(Info);
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end;
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class procedure TRtlTypeRegistry.RegisterType<T>;
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begin
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RegisterType(TypeInfo(T));
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end;
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class procedure TRtlTypeRegistry.RegisterType(Info: PTypeInfo);
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begin
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if FKnownTypes.ContainsKey(Info) then
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exit;
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EnterAnalysis(Info);
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try
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var staticType := AnalyzeType(Info);
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FKnownTypes.Add(Info, staticType);
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finally
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ExitAnalysis(Info);
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end;
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end;
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class function TRtlTypeRegistry.GetStaticType(Info: PTypeInfo): IStaticType;
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begin
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if not FKnownTypes.TryGetValue(Info, Result) then
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Result := TTypes.Unknown;
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end;
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class function TRtlTypeRegistry.ResolveType(RType: TRttiType): IStaticType;
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begin
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if not Assigned(RType) then
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exit(TTypes.Void);
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if FKnownTypes.TryGetValue(RType.Handle, Result) then
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exit;
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if FAnalysisStack.Contains(RType.Handle) then
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raise ERecursionException.CreateFmt('Recursive type reference detected during resolution of "%s".', [RType.Name]);
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case RType.TypeKind of
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tkInteger, tkInt64: Result := TTypes.Ordinal;
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tkFloat: Result := TTypes.Float;
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tkString, tkUString, tkWString, tkLString, tkChar, tkWChar: Result := TTypes.Text;
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tkEnumeration:
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if RType.Handle = TypeInfo(Boolean) then
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Result := TTypes.Boolean
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else
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Result := TTypes.Ordinal;
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tkInterface: raise EInteropException.CreateFmt('Interface "%s" is not registered. Call RegisterType first.', [RType.Name]);
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else
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Result := TTypes.Unknown;
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end;
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end;
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class function TRtlTypeRegistry.AnalyzeType(ATypeInfo: PTypeInfo): IStaticType;
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var
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rType: TRttiType;
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begin
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rType := FCtx.GetType(ATypeInfo);
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case rType.TypeKind of
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tkInterface: Result := GenerateInterfaceDefinition(rType as TRttiInterfaceType);
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else
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Result := ResolveType(rType);
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end;
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end;
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class function TRtlTypeRegistry.GenerateInterfaceDefinition(RType: TRttiInterfaceType): IStaticType;
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var
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methods: TArray<TRttiMethod>;
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props: TArray<TRttiProperty>;
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fields: TList<TPair<IKeyword, IStaticType>>;
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function MakeSig(Method: TRttiMethod): IStaticType;
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var
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ps: TArray<TRttiParameter>;
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pTypes: TArray<IStaticType>;
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returnType: IStaticType;
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k: Integer;
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begin
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ps := Method.GetParameters;
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SetLength(pTypes, Length(ps));
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for k := 0 to High(ps) do
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pTypes[k] := ResolveType(ps[k].ParamType);
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if Assigned(Method.ReturnType) then
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returnType := ResolveType(Method.ReturnType)
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else
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returnType := TTypes.Void;
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Result := TTypes.CreateMethod(pTypes, returnType);
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end;
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begin
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fields := TList<TPair<IKeyword, IStaticType>>.Create;
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try
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methods := RType.GetMethods;
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for var m in methods do
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begin
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// Only map standard procedures/functions
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if m.MethodKind in [mkProcedure, mkFunction] then
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fields.Add(TPair<IKeyword, IStaticType>.Create(TKeywordRegistry.Intern(m.Name), MakeSig(m)));
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end;
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props := RType.GetProperties;
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for var p in props do
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begin
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if p.IsReadable then
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begin
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var propType := ResolveType(p.PropertyType);
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var getterSig := TTypes.CreateMethod([], propType);
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fields.Add(TPair<IKeyword, IStaticType>.Create(TKeywordRegistry.Intern(p.Name), getterSig));
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end;
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end;
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var def := TGenericRecordRegistry.Intern(fields.ToArray);
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Result := TTypes.CreateGenericRecord(def);
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finally
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fields.Free;
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end;
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end;
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// -----------------------------------------------------------------------------
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// Marshalling
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// -----------------------------------------------------------------------------
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class function TRtlTypeRegistry.ToTValue(const AData: TDataValue; ATargetType: TRttiType): TValue;
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begin
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case AData.Kind of
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vkScalar:
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begin
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var sc := AData.AsScalar;
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case sc.Kind of
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TScalar.TKind.Ordinal:
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begin
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if ATargetType.Handle = TypeInfo(Integer) then
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Result := TValue.From<Integer>(Integer(sc.Value.AsInt64))
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else if ATargetType.Handle = TypeInfo(Byte) then
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Result := TValue.From<Byte>(Byte(sc.Value.AsInt64))
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else if ATargetType.Handle = TypeInfo(Word) then
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Result := TValue.From<Word>(Word(sc.Value.AsInt64))
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else
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Result := TValue.From<Int64>(sc.Value.AsInt64);
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end;
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TScalar.TKind.Float, TScalar.TKind.DateTime: Result := TValue.From<Double>(sc.Value.AsDouble);
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TScalar.TKind.Boolean: Result := TValue.From<Boolean>(sc.Value.AsInt64 <> 0);
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TScalar.TKind.Keyword:
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if ATargetType.TypeKind in [tkString, tkUString, tkWString, tkLString] then
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Result := TValue.From<String>(TKeywordRegistry.GetName(sc.Value.AsInt64))
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else
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Result := TValue.From<Int64>(sc.Value.AsInt64);
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end;
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end;
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vkText: Result := TValue.From<string>(AData.AsText);
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vkVoid: Result := TValue.Empty;
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else
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raise EInteropException.CreateFmt('Marshalling for DataKind %s not implemented.', [TRttiEnumerationType.GetName(AData.Kind)]);
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end;
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end;
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class function TRtlTypeRegistry.FromTValue(const AValue: TValue): TDataValue;
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begin
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if AValue.IsEmpty then
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exit(TDataValue.Void);
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case AValue.Kind of
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tkInteger, tkInt64: Result := TScalar.FromInt64(AValue.AsInt64);
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tkFloat: Result := TScalar.FromDouble(AValue.AsExtended);
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tkString, tkUString, tkWString, tkLString: Result := AValue.AsString;
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tkEnumeration:
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if AValue.TypeInfo = TypeInfo(Boolean) then
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Result := TScalar.FromBoolean(AValue.AsBoolean)
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else
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Result := TScalar.FromInt64(AValue.AsOrdinal);
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// Recursively wrap returned interfaces
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tkInterface: Result := WrapInstance(AValue.AsInterface, AValue.TypeInfo);
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else
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Result := TDataValue.Void;
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end;
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end;
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// -----------------------------------------------------------------------------
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// Runtime Wrapping (Shadow Record Creation)
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// -----------------------------------------------------------------------------
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class function TRtlTypeRegistry.WrapInstance(const Instance: IInterface; TypeInfo: PTypeInfo): TDataValue;
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var
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rType: TRttiType;
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rIntf: TRttiInterfaceType;
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recFields: TDictionary<IKeyword, TDataValue>;
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begin
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if Instance = nil then
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exit(TDataValue.Void);
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rType := FCtx.GetType(TypeInfo);
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if not (rType is TRttiInterfaceType) then
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exit(TDataValue.Void);
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rIntf := rType as TRttiInterfaceType;
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recFields := TDictionary<IKeyword, TDataValue>.Create;
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try
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// Wrap Methods
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for var m in rIntf.GetMethods do
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begin
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if (m.MethodKind in [mkProcedure, mkFunction]) then
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begin
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var key := TKeywordRegistry.Intern(m.Name);
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if recFields.ContainsKey(key) then
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raise EInteropException.Create('Overloading not supported');
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var methodFactory :=
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function(const Instance: IInterface; Meth: TRttiMethod): TDataValue.TFunc
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begin
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var inst := TValue.From(Instance);
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var params := Meth.GetParameters;
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Result :=
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function(const Args: TArray<TDataValue>): TDataValue
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var
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rttiArgs: TArray<TValue>;
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res: TValue;
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i: Integer;
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begin
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if Length(Args) <> Length(params) then
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raise Exception.CreateFmt('Method %s expects %d args', [m.Name, Length(params)]);
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SetLength(rttiArgs, Length(params));
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for i := 0 to High(params) do
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rttiArgs[i] := ToTValue(Args[i], params[i].ParamType);
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res := Meth.Invoke(inst, rttiArgs);
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Result := FromTValue(res);
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end;
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end;
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recFields.Add(key, methodFactory(Instance, m));
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end;
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end;
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Result := TDataValue.FromGenericRecord(TKeywordMapping<TDataValue>.Create(recFields.ToArray));
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finally
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recFields.Free;
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end;
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end;
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// -----------------------------------------------------------------------------
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// Factories
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// -----------------------------------------------------------------------------
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class procedure TRtlTypeRegistry.RegisterFactory<T>(
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const Scope: IExecutionScope;
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const FactoryName: string;
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const FactoryArgs: TArray<IStaticType>;
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const FactoryDelegate: TInterfaceFactoryDelegate<T>
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);
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var
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staticType: IStaticType;
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ti: PTypeInfo;
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begin
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ti := TypeInfo(T);
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staticType := GetStaticType(ti);
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if staticType.Kind = stUnknown then
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raise EInteropException.CreateFmt('Interface "%s" must be registered via RegisterType<T> first.', [string(ti.Name)]);
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var factoryWrapper: TDataValue.TFunc :=
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function(const Args: TArray<TDataValue>): TDataValue
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var
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instance: T;
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begin
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instance := FactoryDelegate(Args);
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// Result wrapping will handle reference counting via closures
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Result := WrapInstance(instance, ti);
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end;
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var factorySig := TTypes.CreateMethod(FactoryArgs, staticType);
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Scope.Define(FactoryName, TDataValue(factoryWrapper), factorySig);
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end;
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end.
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