Michael Schimmel
816 lines
28 KiB
ObjectPascal
816 lines
28 KiB
ObjectPascal
unit Myc.Ast.Json;
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interface
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uses
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System.SysUtils,
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System.Generics.Collections,
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System.JSON,
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Myc.Data.Scalar,
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Myc.Data.Value,
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Myc.Ast,
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Myc.Ast.Visitor,
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Myc.Ast.Nodes;
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type
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IJsonAstConverter = interface
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function Serialize(const RootNode: IAstNode): TJSONObject;
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function Deserialize(const AJson: TJSONObject): IAstNode;
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end;
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// TJsonAstConverter implements the visitor pattern for serialization
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// and uses factory functions for deserialization.
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TJsonAstConverter = class(TAstVisitor, IJsonAstConverter)
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private
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FJsonObjectStack: TStack<TJSONObject>;
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procedure DataValueToJson(const AValue: TDataValue; const AParent: TJSONObject; const AName: string);
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function JsonToNode(const AJson: TJSONValue): IAstNode;
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function JsonToDataValue(const AObj: TJSONObject; const AName: string): TDataValue;
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function JsonToConstantNode(const AObj: TJSONObject): IConstantNode;
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function JsonToIdentifierNode(const AObj: TJSONObject): IIdentifierNode;
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function JsonToBinaryExprNode(const AObj: TJSONObject): IBinaryExpressionNode;
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function JsonToUnaryExprNode(const AObj: TJSONObject): IUnaryExpressionNode;
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function JsonToIfExprNode(const AObj: TJSONObject): IIfExpressionNode;
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function JsonToTernaryExprNode(const AObj: TJSONObject): ITernaryExpressionNode;
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function JsonToLambdaExprNode(const AObj: TJSONObject): ILambdaExpressionNode;
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function JsonToMacroDefNode(const AObj: TJSONObject): IMacroDefinitionNode;
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function JsonToFunctionCallNode(const AObj: TJSONObject): IFunctionCallNode;
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function JsonToRecurNode(const AObj: TJSONObject): IRecurNode;
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function JsonToBlockNode(const AObj: TJSONObject): IBlockExpressionNode;
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function JsonToVarDeclNode(const AObj: TJSONObject): IVariableDeclarationNode;
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function JsonToAssignmentNode(const AObj: TJSONObject): IAssignmentNode;
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function JsonToIndexerNode(const AObj: TJSONObject): IIndexerNode;
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function JsonToMemberAccessNode(const AObj: TJSONObject): IMemberAccessNode;
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function JsonToCreateSeriesNode(const AObj: TJSONObject): ICreateSeriesNode;
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function JsonToAddSeriesItemNode(const AObj: TJSONObject): IAddSeriesItemNode;
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function JsonToSeriesLengthNode(const AObj: TJSONObject): ISeriesLengthNode;
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protected
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// IAstVisitor implementation for serialization
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function VisitConstant(const Node: IConstantNode): TDataValue; override;
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function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
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function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
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function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
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function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
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function VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue; override;
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function VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue; override;
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function VisitMacroDefinition(const Node: IMacroDefinitionNode): TDataValue; override;
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function VisitFunctionCall(const Node: IFunctionCallNode): TDataValue; override;
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function VisitRecurNode(const Node: IRecurNode): TDataValue; override;
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function VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue; override;
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function VisitVariableDeclaration(const Node: IVariableDeclarationNode): TDataValue; override;
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function VisitAssignment(const Node: IAssignmentNode): TDataValue; override;
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function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
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function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
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function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
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function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
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function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
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function Serialize(const RootNode: IAstNode): TJSONObject;
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function Deserialize(const AJson: TJSONObject): IAstNode;
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public
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constructor Create;
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destructor Destroy; override;
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end;
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implementation
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{ TJsonAstConverter }
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constructor TJsonAstConverter.Create;
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begin
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inherited;
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FJsonObjectStack := TStack<TJSONObject>.Create;
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end;
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destructor TJsonAstConverter.Destroy;
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begin
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FJsonObjectStack.Free;
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inherited;
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end;
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function TJsonAstConverter.Deserialize(const AJson: TJSONObject): IAstNode;
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begin
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Result := JsonToNode(AJson);
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end;
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{ TJsonAstConverter - IAstVisitor for Serialization }
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procedure TJsonAstConverter.DataValueToJson(const AValue: TDataValue; const AParent: TJSONObject; const AName: string);
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var
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valObj, scalarObj: TJSONObject;
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begin
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valObj := TJSONObject.Create;
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valObj.AddPair('Kind', TJSONString.Create(AValue.Kind.ToString));
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case AValue.Kind of
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vkScalar:
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begin
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scalarObj := TJSONObject.Create;
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scalarObj.AddPair('Kind', TJSONString.Create(AValue.AsScalar.Kind.ToString));
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case AValue.AsScalar.Kind of
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TScalar.TKind.Ordinal: scalarObj.AddPair('Value', TJSONNumber.Create(AValue.AsScalar.Value.AsInt64));
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TScalar.TKind.Float: scalarObj.AddPair('Value', TJSONNumber.Create(AValue.AsScalar.Value.AsDouble));
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end;
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valObj.AddPair('Value', scalarObj);
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end;
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vkText: valObj.AddPair('Value', TJSONString.Create(AValue.AsText));
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vkVoid:; // No value to add
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else
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raise ENotSupportedException.Create('Unsupported TDataValue kind for constant serialization.');
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end;
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AParent.AddPair(AName, valObj);
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end;
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function TJsonAstConverter.VisitConstant(const Node: IConstantNode): TDataValue;
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var
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obj: TJSONObject;
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begin
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('Constant'));
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DataValueToJson(Node.Value, obj, 'Value');
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitIdentifier(const Node: IIdentifierNode): TDataValue;
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var
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obj: TJSONObject;
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begin
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('Identifier'));
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obj.AddPair('Name', TJSONString.Create(Node.Name));
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
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var
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obj, leftObj, rightObj: TJSONObject;
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begin
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Node.Left.Accept(Self);
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Node.Right.Accept(Self);
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rightObj := FJsonObjectStack.Pop;
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leftObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('BinaryExpr'));
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obj.AddPair('Operator', TJSONString.Create(Node.Operator.ToString));
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obj.AddPair('Left', leftObj);
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obj.AddPair('Right', rightObj);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue;
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var
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obj, rightObj: TJSONObject;
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begin
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Node.Right.Accept(Self);
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rightObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('UnaryExpr'));
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obj.AddPair('Operator', TJSONString.Create(Node.Operator.ToString));
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obj.AddPair('Right', rightObj);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitIfExpression(const Node: IIfExpressionNode): TDataValue;
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var
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obj, condObj, thenObj, elseObj: TJSONObject;
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begin
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Node.Condition.Accept(Self);
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Node.ThenBranch.Accept(Self);
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if Assigned(Node.ElseBranch) then
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Node.ElseBranch.Accept(Self);
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if Assigned(Node.ElseBranch) then
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elseObj := FJsonObjectStack.Pop
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else
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elseObj := nil;
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thenObj := FJsonObjectStack.Pop;
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condObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('IfExpr'));
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obj.AddPair('Condition', condObj);
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obj.AddPair('ThenBranch', thenObj);
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if Assigned(elseObj) then
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obj.AddPair('ElseBranch', elseObj)
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else
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obj.AddPair('ElseBranch', TJSONNull.Create);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue;
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var
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obj, condObj, thenObj, elseObj: TJSONObject;
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begin
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Node.Condition.Accept(Self);
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Node.ThenBranch.Accept(Self);
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Node.ElseBranch.Accept(Self);
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elseObj := FJsonObjectStack.Pop;
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thenObj := FJsonObjectStack.Pop;
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condObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('TernaryExpr'));
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obj.AddPair('Condition', condObj);
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obj.AddPair('ThenBranch', thenObj);
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obj.AddPair('ElseBranch', elseObj);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue;
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var
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obj, bodyObj: TJSONObject;
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paramsArray: TJSONArray;
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tempParams: TArray<TJSONObject>;
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param: IIdentifierNode;
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i: Integer;
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begin
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for param in Node.Parameters do
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param.Accept(Self);
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Node.Body.Accept(Self);
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bodyObj := FJsonObjectStack.Pop;
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SetLength(tempParams, Length(Node.Parameters));
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for i := High(tempParams) downto 0 do
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tempParams[i] := FJsonObjectStack.Pop;
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paramsArray := TJSONArray.Create;
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for i := 0 to High(tempParams) do
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paramsArray.Add(tempParams[i]);
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('LambdaExpr'));
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obj.AddPair('Parameters', paramsArray);
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obj.AddPair('Body', bodyObj);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitMacroDefinition(const Node: IMacroDefinitionNode): TDataValue;
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var
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obj, nameObj, bodyObj: TJSONObject;
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paramsArray: TJSONArray;
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tempParams: TArray<TJSONObject>;
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param: IIdentifierNode;
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i: Integer;
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begin
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// Added serialization for macro definitions.
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Node.Name.Accept(Self);
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for param in Node.Parameters do
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param.Accept(Self);
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Node.Body.Accept(Self);
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bodyObj := FJsonObjectStack.Pop;
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SetLength(tempParams, Length(Node.Parameters));
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for i := High(tempParams) downto 0 do
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tempParams[i] := FJsonObjectStack.Pop;
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nameObj := FJsonObjectStack.Pop;
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paramsArray := TJSONArray.Create;
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for i := 0 to High(tempParams) do
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paramsArray.Add(tempParams[i]);
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('MacroDef'));
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obj.AddPair('Name', nameObj);
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obj.AddPair('Parameters', paramsArray);
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obj.AddPair('Body', bodyObj);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitFunctionCall(const Node: IFunctionCallNode): TDataValue;
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var
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obj, calleeObj: TJSONObject;
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argsArray: TJSONArray;
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tempArgs: TArray<TJSONObject>;
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arg: IAstNode;
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i: Integer;
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begin
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Node.Callee.Accept(Self);
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for arg in Node.Arguments do
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arg.Accept(Self);
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SetLength(tempArgs, Length(Node.Arguments));
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for i := High(tempArgs) downto 0 do
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tempArgs[i] := FJsonObjectStack.Pop;
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argsArray := TJSONArray.Create;
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for i := 0 to High(tempArgs) do
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argsArray.Add(tempArgs[i]);
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calleeObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('FunctionCall'));
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obj.AddPair('Callee', calleeObj);
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obj.AddPair('Arguments', argsArray);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitRecurNode(const Node: IRecurNode): TDataValue;
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var
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obj: TJSONObject;
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argsArray: TJSONArray;
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tempArgs: TArray<TJSONObject>;
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arg: IAstNode;
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i: Integer;
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begin
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for arg in Node.Arguments do
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arg.Accept(Self);
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SetLength(tempArgs, Length(Node.Arguments));
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for i := High(tempArgs) downto 0 do
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tempArgs[i] := FJsonObjectStack.Pop;
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argsArray := TJSONArray.Create;
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for i := 0 to High(tempArgs) do
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argsArray.Add(tempArgs[i]);
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('Recur'));
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obj.AddPair('Arguments', argsArray);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue;
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var
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obj: TJSONObject;
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exprsArray: TJSONArray;
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tempExprs: TArray<TJSONObject>;
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expr: IAstNode;
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i: Integer;
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begin
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for expr in Node.Expressions do
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expr.Accept(Self);
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SetLength(tempExprs, Node.Expressions.Count);
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for i := High(tempExprs) downto 0 do
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tempExprs[i] := FJsonObjectStack.Pop;
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exprsArray := TJSONArray.Create;
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for i := 0 to High(tempExprs) do
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exprsArray.Add(tempExprs[i]);
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('Block'));
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obj.AddPair('Expressions', exprsArray);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitVariableDeclaration(const Node: IVariableDeclarationNode): TDataValue;
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var
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obj, identObj, initObj: TJSONObject;
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begin
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Node.Identifier.Accept(Self);
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if Assigned(Node.Initializer) then
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Node.Initializer.Accept(Self);
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if Assigned(Node.Initializer) then
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initObj := FJsonObjectStack.Pop
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else
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initObj := nil;
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identObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('VarDecl'));
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obj.AddPair('Identifier', identObj);
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if Assigned(initObj) then
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obj.AddPair('Initializer', initObj)
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else
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obj.AddPair('Initializer', TJSONNull.Create);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitAssignment(const Node: IAssignmentNode): TDataValue;
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var
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obj, identObj, valueObj: TJSONObject;
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begin
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Node.Identifier.Accept(Self);
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Node.Value.Accept(Self);
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valueObj := FJsonObjectStack.Pop;
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identObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('Assignment'));
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obj.AddPair('Identifier', identObj);
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obj.AddPair('Value', valueObj);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitIndexer(const Node: IIndexerNode): TDataValue;
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var
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obj, baseObj, indexObj: TJSONObject;
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begin
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Node.Base.Accept(Self);
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Node.Index.Accept(Self);
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indexObj := FJsonObjectStack.Pop;
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baseObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('Indexer'));
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obj.AddPair('Base', baseObj);
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obj.AddPair('Index', indexObj);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitMemberAccess(const Node: IMemberAccessNode): TDataValue;
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var
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obj, baseObj, memberObj: TJSONObject;
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begin
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Node.Base.Accept(Self);
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Node.Member.Accept(Self);
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memberObj := FJsonObjectStack.Pop;
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baseObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('MemberAccess'));
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obj.AddPair('Base', baseObj);
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obj.AddPair('Member', memberObj);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
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var
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obj: TJSONObject;
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begin
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('CreateSeries'));
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obj.AddPair('Definition', TJSONString.Create(Node.Definition));
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue;
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var
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obj, seriesObj, valueObj, lookbackObj: TJSONObject;
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begin
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Node.Series.Accept(Self);
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Node.Value.Accept(Self);
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if Assigned(Node.Lookback) then
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Node.Lookback.Accept(Self);
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if Assigned(Node.Lookback) then
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lookbackObj := FJsonObjectStack.Pop
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else
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lookbackObj := nil;
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valueObj := FJsonObjectStack.Pop;
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seriesObj := FJsonObjectStack.Pop;
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obj := TJSONObject.Create;
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obj.AddPair('NodeType', TJSONString.Create('AddSeriesItem'));
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obj.AddPair('Series', seriesObj);
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obj.AddPair('Value', valueObj);
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if Assigned(lookbackObj) then
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obj.AddPair('Lookback', lookbackObj)
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else
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obj.AddPair('Lookback', TJSONNull.Create);
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FJsonObjectStack.Push(obj);
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Result := TDataValue.Void;
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end;
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function TJsonAstConverter.VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue;
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var
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obj, seriesObj: TJSONObject;
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begin
|
|
Node.Series.Accept(Self);
|
|
seriesObj := FJsonObjectStack.Pop;
|
|
|
|
obj := TJSONObject.Create;
|
|
obj.AddPair('NodeType', TJSONString.Create('SeriesLength'));
|
|
obj.AddPair('Series', seriesObj);
|
|
FJsonObjectStack.Push(obj);
|
|
Result := TDataValue.Void;
|
|
end;
|
|
|
|
{ TJsonAstConverter - Deserialization }
|
|
|
|
function TJsonAstConverter.JsonToDataValue(const AObj: TJSONObject; const AName: string): TDataValue;
|
|
var
|
|
valObj, scalarObj: TJSONObject;
|
|
kindStr: string;
|
|
scalarKind: TScalar.TKind;
|
|
begin
|
|
valObj := AObj.GetValue<TJSONObject>(AName);
|
|
kindStr := valObj.GetValue<string>('Kind');
|
|
|
|
if SameText(kindStr, 'Scalar') then
|
|
begin
|
|
scalarObj := valObj.GetValue<TJSONObject>('Value');
|
|
kindStr := scalarObj.GetValue<string>('Kind');
|
|
scalarKind := TScalar.StringToKind(kindStr);
|
|
case scalarKind of
|
|
TScalar.TKind.Ordinal: Result := TScalar.FromInt64(scalarObj.GetValue<TJSONNumber>('Value').AsInt64);
|
|
TScalar.TKind.Float: Result := TScalar.FromDouble(scalarObj.GetValue<TJSONNumber>('Value').AsDouble);
|
|
end;
|
|
end
|
|
else if SameText(kindStr, 'Text') then
|
|
begin
|
|
Result := valObj.GetValue<string>('Value');
|
|
end
|
|
else if SameText(kindStr, 'Void') then
|
|
begin
|
|
Result := TDataValue.Void;
|
|
end
|
|
else
|
|
raise ENotSupportedException.Create('Unsupported TDataValue kind for constant deserialization.');
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToConstantNode(const AObj: TJSONObject): IConstantNode;
|
|
begin
|
|
Result := TAst.Constant(JsonToDataValue(AObj, 'Value'));
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToIdentifierNode(const AObj: TJSONObject): IIdentifierNode;
|
|
begin
|
|
Result := TAst.Identifier(AObj.GetValue<string>('Name'));
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToBinaryExprNode(const AObj: TJSONObject): IBinaryExpressionNode;
|
|
var
|
|
opStr: string;
|
|
op: TScalar.TBinaryOp;
|
|
leftNode, rightNode: IAstNode;
|
|
begin
|
|
opStr := AObj.GetValue<string>('Operator');
|
|
for op := Low(TScalar.TBinaryOp) to High(TScalar.TBinaryOp) do
|
|
if SameText(op.ToString, opStr) then
|
|
begin
|
|
leftNode := JsonToNode(AObj.GetValue('Left'));
|
|
rightNode := JsonToNode(AObj.GetValue('Right'));
|
|
Result := TAst.BinaryExpr(leftNode, op, rightNode);
|
|
exit;
|
|
end;
|
|
raise EInvalidOpException.CreateFmt('Unknown binary operator "%s"', [opStr]);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToUnaryExprNode(const AObj: TJSONObject): IUnaryExpressionNode;
|
|
var
|
|
opStr: string;
|
|
op: TScalar.TUnaryOp;
|
|
rightNode: IAstNode;
|
|
begin
|
|
opStr := AObj.GetValue<string>('Operator');
|
|
for op := Low(TScalar.TUnaryOp) to High(TScalar.TUnaryOp) do
|
|
if SameText(op.ToString, opStr) then
|
|
begin
|
|
rightNode := JsonToNode(AObj.GetValue('Right'));
|
|
Result := TAst.UnaryExpr(op, rightNode);
|
|
exit;
|
|
end;
|
|
raise EInvalidOpException.CreateFmt('Unknown unary operator "%s"', [opStr]);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToIfExprNode(const AObj: TJSONObject): IIfExpressionNode;
|
|
var
|
|
condNode, thenNode, elseNode: IAstNode;
|
|
begin
|
|
condNode := JsonToNode(AObj.GetValue('Condition'));
|
|
thenNode := JsonToNode(AObj.GetValue('ThenBranch'));
|
|
if not (AObj.GetValue('ElseBranch') is TJSONNull) then
|
|
elseNode := JsonToNode(AObj.GetValue('ElseBranch'))
|
|
else
|
|
elseNode := nil;
|
|
Result := TAst.IfExpr(condNode, thenNode, elseNode);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToTernaryExprNode(const AObj: TJSONObject): ITernaryExpressionNode;
|
|
var
|
|
condNode, thenNode, elseNode: IAstNode;
|
|
begin
|
|
condNode := JsonToNode(AObj.GetValue('Condition'));
|
|
thenNode := JsonToNode(AObj.GetValue('ThenBranch'));
|
|
elseNode := JsonToNode(AObj.GetValue('ElseBranch'));
|
|
Result := TAst.TernaryExpr(condNode, thenNode, elseNode);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToLambdaExprNode(const AObj: TJSONObject): ILambdaExpressionNode;
|
|
var
|
|
params: TArray<IIdentifierNode>;
|
|
body: IAstNode;
|
|
paramArray: TJSONArray;
|
|
i: Integer;
|
|
begin
|
|
paramArray := AObj.GetValue<TJSONArray>('Parameters');
|
|
SetLength(params, paramArray.Count);
|
|
for i := 0 to paramArray.Count - 1 do
|
|
params[i] := JsonToIdentifierNode(paramArray.Items[i] as TJSONObject);
|
|
|
|
body := JsonToNode(AObj.GetValue('Body'));
|
|
Result := TAst.LambdaExpr(params, body);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToMacroDefNode(const AObj: TJSONObject): IMacroDefinitionNode;
|
|
var
|
|
name: IIdentifierNode;
|
|
params: TArray<IIdentifierNode>;
|
|
body: IAstNode;
|
|
paramArray: TJSONArray;
|
|
i: Integer;
|
|
begin
|
|
// Added deserialization for macro definitions.
|
|
name := JsonToIdentifierNode(AObj.GetValue('Name') as TJSONObject);
|
|
|
|
paramArray := AObj.GetValue<TJSONArray>('Parameters');
|
|
SetLength(params, paramArray.Count);
|
|
for i := 0 to paramArray.Count - 1 do
|
|
params[i] := JsonToIdentifierNode(paramArray.Items[i] as TJSONObject);
|
|
|
|
body := JsonToNode(AObj.GetValue('Body'));
|
|
Result := TAst.MacroDef(name, params, body);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToFunctionCallNode(const AObj: TJSONObject): IFunctionCallNode;
|
|
var
|
|
callee: IAstNode;
|
|
args: TArray<IAstNode>;
|
|
argsArray: TJSONArray;
|
|
i: Integer;
|
|
begin
|
|
callee := JsonToNode(AObj.GetValue('Callee'));
|
|
argsArray := AObj.GetValue<TJSONArray>('Arguments');
|
|
SetLength(args, argsArray.Count);
|
|
for i := 0 to argsArray.Count - 1 do
|
|
args[i] := JsonToNode(argsArray.Items[i]);
|
|
|
|
Result := TAst.FunctionCall(callee, args);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToRecurNode(const AObj: TJSONObject): IRecurNode;
|
|
var
|
|
args: TArray<IAstNode>;
|
|
argsArray: TJSONArray;
|
|
i: Integer;
|
|
begin
|
|
argsArray := AObj.GetValue<TJSONArray>('Arguments');
|
|
SetLength(args, argsArray.Count);
|
|
for i := 0 to argsArray.Count - 1 do
|
|
args[i] := JsonToNode(argsArray.Items[i]);
|
|
|
|
Result := TAst.Recur(args);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToBlockNode(const AObj: TJSONObject): IBlockExpressionNode;
|
|
var
|
|
expressions: TArray<IAstNode>;
|
|
exprsArray: TJSONArray;
|
|
i: Integer;
|
|
begin
|
|
exprsArray := AObj.GetValue<TJSONArray>('Expressions');
|
|
SetLength(expressions, exprsArray.Count);
|
|
for i := 0 to exprsArray.Count - 1 do
|
|
expressions[i] := JsonToNode(exprsArray.Items[i]);
|
|
|
|
Result := TAst.Block(expressions);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToVarDeclNode(const AObj: TJSONObject): IVariableDeclarationNode;
|
|
var
|
|
ident: IIdentifierNode;
|
|
initializer: IAstNode;
|
|
begin
|
|
ident := JsonToIdentifierNode(AObj.GetValue('Identifier') as TJSONObject);
|
|
if not (AObj.GetValue('Initializer') is TJSONNull) then
|
|
initializer := JsonToNode(AObj.GetValue('Initializer'))
|
|
else
|
|
initializer := nil;
|
|
|
|
Result := TAst.VarDecl(ident, initializer);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToAssignmentNode(const AObj: TJSONObject): IAssignmentNode;
|
|
var
|
|
ident: IIdentifierNode;
|
|
value: IAstNode;
|
|
begin
|
|
ident := JsonToIdentifierNode(AObj.GetValue('Identifier') as TJSONObject);
|
|
value := JsonToNode(AObj.GetValue('Value'));
|
|
Result := TAst.Assign(ident, value);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToIndexerNode(const AObj: TJSONObject): IIndexerNode;
|
|
begin
|
|
Result := TAst.Indexer(JsonToNode(AObj.GetValue('Base')), JsonToNode(AObj.GetValue('Index')));
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToMemberAccessNode(const AObj: TJSONObject): IMemberAccessNode;
|
|
begin
|
|
Result := TAst.MemberAccess(JsonToNode(AObj.GetValue('Base')), JsonToIdentifierNode(AObj.GetValue('Member') as TJSONObject));
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToCreateSeriesNode(const AObj: TJSONObject): ICreateSeriesNode;
|
|
begin
|
|
Result := TAst.CreateSeries(AObj.GetValue<string>('Definition'));
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToAddSeriesItemNode(const AObj: TJSONObject): IAddSeriesItemNode;
|
|
var
|
|
lookbackNode: IAstNode;
|
|
begin
|
|
if not (AObj.GetValue('Lookback') is TJSONNull) then
|
|
lookbackNode := JsonToNode(AObj.GetValue('Lookback'))
|
|
else
|
|
lookbackNode := nil;
|
|
|
|
Result :=
|
|
TAst.AddSeriesItem(JsonToIdentifierNode(AObj.GetValue('Series') as TJSONObject), JsonToNode(AObj.GetValue('Value')), lookbackNode);
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToSeriesLengthNode(const AObj: TJSONObject): ISeriesLengthNode;
|
|
begin
|
|
Result := TAst.SeriesLength(JsonToIdentifierNode(AObj.GetValue('Series') as TJSONObject));
|
|
end;
|
|
|
|
function TJsonAstConverter.JsonToNode(const AJson: TJSONValue): IAstNode;
|
|
var
|
|
obj: TJSONObject;
|
|
nodeType: string;
|
|
begin
|
|
if not (AJson is TJSONObject) then
|
|
raise EInvalidCast.Create('Expected a JSON object for node deserialization.');
|
|
|
|
obj := AJson as TJSONObject;
|
|
nodeType := obj.GetValue<string>('NodeType');
|
|
|
|
if nodeType = 'Constant' then
|
|
Result := JsonToConstantNode(obj)
|
|
else if nodeType = 'Identifier' then
|
|
Result := JsonToIdentifierNode(obj)
|
|
else if nodeType = 'BinaryExpr' then
|
|
Result := JsonToBinaryExprNode(obj)
|
|
else if nodeType = 'UnaryExpr' then
|
|
Result := JsonToUnaryExprNode(obj)
|
|
else if nodeType = 'IfExpr' then
|
|
Result := JsonToIfExprNode(obj)
|
|
else if nodeType = 'TernaryExpr' then
|
|
Result := JsonToTernaryExprNode(obj)
|
|
else if nodeType = 'LambdaExpr' then
|
|
Result := JsonToLambdaExprNode(obj)
|
|
else if nodeType = 'MacroDef' then
|
|
Result := JsonToMacroDefNode(obj)
|
|
else if nodeType = 'FunctionCall' then
|
|
Result := JsonToFunctionCallNode(obj)
|
|
else if nodeType = 'Recur' then
|
|
Result := JsonToRecurNode(obj)
|
|
else if nodeType = 'Block' then
|
|
Result := JsonToBlockNode(obj)
|
|
else if nodeType = 'VarDecl' then
|
|
Result := JsonToVarDeclNode(obj)
|
|
else if nodeType = 'Assignment' then
|
|
Result := JsonToAssignmentNode(obj)
|
|
else if nodeType = 'Indexer' then
|
|
Result := JsonToIndexerNode(obj)
|
|
else if nodeType = 'MemberAccess' then
|
|
Result := JsonToMemberAccessNode(obj)
|
|
else if nodeType = 'CreateSeries' then
|
|
Result := JsonToCreateSeriesNode(obj)
|
|
else if nodeType = 'AddSeriesItem' then
|
|
Result := JsonToAddSeriesItemNode(obj)
|
|
else if nodeType = 'SeriesLength' then
|
|
Result := JsonToSeriesLengthNode(obj)
|
|
else
|
|
raise ENotSupportedException.CreateFmt('Unsupported NodeType "%s" for JSON deserialization.', [nodeType]);
|
|
end;
|
|
|
|
function TJsonAstConverter.Serialize(const RootNode: IAstNode): TJSONObject;
|
|
begin
|
|
FJsonObjectStack.Clear;
|
|
if not Assigned(RootNode) then
|
|
exit(nil);
|
|
|
|
RootNode.Accept(Self);
|
|
|
|
if FJsonObjectStack.Count <> 1 then
|
|
raise EInvalidOpException.Create('JSON serialization stack is corrupt.');
|
|
|
|
Result := FJsonObjectStack.Pop;
|
|
end;
|
|
|
|
end.
|