Michael Schimmel
549 lines
20 KiB
ObjectPascal
549 lines
20 KiB
ObjectPascal
unit Myc.Ast.Evaluator;
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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.Generics.Collections,
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Myc.Data.Scalar,
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Myc.Data.Value,
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Myc.Ast.Nodes,
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Myc.Ast.Visitor,
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Myc.Ast.Binding,
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Myc.Ast.Scope;
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type
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// The standard AST evaluator for production use.
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TEvaluatorVisitor = class(TAstVisitor, IEvaluatorVisitor)
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private
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FScope: IExecutionScope;
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procedure HandleTCO(var ResultValue: TDataValue);
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protected
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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 VisitQuasiquote(const Node: IQuasiquoteNode): TDataValue; override;
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function VisitUnquote(const Node: IUnquoteNode): TDataValue; override;
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function VisitUnquoteSplicing(const Node: IUnquoteSplicingNode): TDataValue; override;
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function VisitFunctionCall(const Node: IFunctionCallNode): 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 VisitRecurNode(const Node: IRecurNode): TDataValue; override;
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function IsTruthy(const AValue: TDataValue): Boolean; inline;
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// Returns a closure that can create the correct type of visitor for a lambda's body.
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function CreateVisitorFactory: TEvaluatorFactory; virtual;
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property Scope: IExecutionScope read FScope;
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public
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constructor Create(const AScope: IExecutionScope);
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// Executes an AST with proper TCO handling. This is the main entry point.
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function Execute(const RootNode: IAstNode): TDataValue;
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end;
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// Registers native Delphi functions into a scope.
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procedure RegisterNativeFunctions(const AScope: IExecutionScope);
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implementation
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uses
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System.TypInfo,
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System.Generics.Defaults,
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Myc.Data.Decimal,
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Myc.Data.Series,
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Myc.Data.Scalar.JSON;
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// Helper type for TCO via trampolining.
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type
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TThunk = record
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Callee: TDataValue;
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Args: TArray<TDataValue>;
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constructor Create(const ACallee: TDataValue; const AArgs: TArray<TDataValue>);
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end;
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constructor TThunk.Create(const ACallee: TDataValue; const AArgs: TArray<TDataValue>);
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begin
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Callee := ACallee;
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Args := AArgs;
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end;
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// --- Native Functions Implementation ---
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function NativeCreateRecordSeries(const Args: TArray<TDataValue>): TDataValue;
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var
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jsonDef: string;
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recordDef: TScalarRecordDefinition;
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series: IRecordSeries;
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begin
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if (Length(Args) <> 1) or (Args[0].Kind <> vkText) then
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raise EArgumentException.Create('CreateRecordSeries requires one string argument.');
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jsonDef := Args[0].AsText;
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recordDef := TRttiAstHelper.JsonToRecordDefinition(jsonDef);
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if Length(recordDef.Fields) = 0 then
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raise EArgumentException.Create('Failed to parse record definition from JSON.');
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series := TScalarRecordSeries.Create(recordDef);
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Result := TDataValue.FromRecordSeries(series);
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end;
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// --- Registration Procedure ---
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procedure RegisterNativeFunctions(const AScope: IExecutionScope);
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begin
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AScope.Define('CreateRecordSeries', TDataValue(NativeCreateRecordSeries));
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end;
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{ TEvaluatorVisitor }
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constructor TEvaluatorVisitor.Create(const AScope: IExecutionScope);
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begin
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inherited Create;
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Assert(Assigned(AScope));
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FScope := AScope;
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end;
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function TEvaluatorVisitor.Execute(const RootNode: IAstNode): TDataValue;
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begin
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if not Assigned(RootNode) then
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exit(TDataValue.Void);
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Result := RootNode.Accept(Self);
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HandleTCO(Result);
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end;
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function TEvaluatorVisitor.CreateVisitorFactory: TEvaluatorFactory;
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begin
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// The production visitor returns a factory that creates another production visitor.
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Result := function(const AScope: IExecutionScope): IEvaluatorVisitor begin Result := TEvaluatorVisitor.Create(AScope); end;
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end;
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procedure TEvaluatorVisitor.HandleTCO(var ResultValue: TDataValue);
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begin
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// This is the central trampoline loop for Tail Call Optimization.
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// It runs as long as the evaluation returns a thunk.
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while ResultValue.Kind = vkGeneric do
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begin
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var thunk := ResultValue.AsGeneric<TThunk>;
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var callee := thunk.Callee.AsMethod();
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ResultValue := callee(thunk.Args);
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end;
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end;
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function TEvaluatorVisitor.IsTruthy(const AValue: TDataValue): Boolean;
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begin
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if (AValue.Kind <> vkScalar) then
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begin
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Result := False;
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exit;
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end;
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case AValue.AsScalar.Kind of
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TScalar.TKind.Ordinal: Result := (AValue.AsScalar.Value.AsInt64 <> 0);
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TScalar.TKind.Float: Result := (AValue.AsScalar.Value.AsDouble <> 0.0);
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else
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Result := False;
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end;
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end;
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function TEvaluatorVisitor.VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue;
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var
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boundNode: TBoundLambdaExpressionNode;
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capturedCells: TArray<IValueCell>;
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i: Integer;
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sourceAddresses: TArray<TResolvedAddress>;
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closureScope: IExecutionScope;
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visitorFactory: TEvaluatorFactory;
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begin
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// Cast to the bound node to access binder-specific information.
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boundNode := Node as TBoundLambdaExpressionNode;
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// Create the closure by capturing the value cells of all upvalues from the current scope.
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sourceAddresses := boundNode.Upvalues;
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SetLength(capturedCells, Length(sourceAddresses));
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for i := 0 to High(sourceAddresses) do
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capturedCells[i] := FScope.Capture(sourceAddresses[i]);
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// Memory optimization: a lambda's scope does not need to be kept alive as a parent
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// if it contains no nested lambdas that might need to capture from it later.
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if boundNode.HasNestedLambdas then
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closureScope := FScope
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else
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closureScope := nil;
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// Get a factory to create the correct visitor (e.g., debug or production) for the lambda body.
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visitorFactory := CreateVisitorFactory();
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var scopeDescriptor := boundNode.ScopeDescriptor;
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var params := boundNode.Parameters;
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// [weak] prevents a reference cycle since the closure captures itself for 'recur'.
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var [weak] closure: TDataValue.TFunc;
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var cNode: ILambdaExpressionNode := Node;
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closure :=
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TDataValue.TFunc(
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function(const ArgValues: TArray<TDataValue>): TDataValue
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var
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lambdaScope: IExecutionScope;
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bodyVisitor: IAstVisitor;
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i: Integer;
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adr: TResolvedAddress;
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begin
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if (Length(ArgValues) <> Length(params)) then
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raise EArgumentException.CreateFmt('Argument count mismatch: expected %d, got %d', [Length(params), Length(ArgValues)]);
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// Create the new execution scope for this function call.
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lambdaScope := TScope.CreateScope(closureScope, scopeDescriptor, capturedCells);
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adr.Kind := akLocalOrParent;
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adr.ScopeDepth := 0;
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// Capture the closure itself in slot 0 for 'recur' to find it.
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adr.SlotIndex := 0;
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lambdaScope[adr] := TDataValue(closure);
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// Populate the scope with the actual parameters passed to the function.
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for i := 0 to High(ArgValues) do
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begin
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// Parameters in a bound lambda must be bound identifiers.
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adr.SlotIndex := (params[i] as TBoundIdentifierNode).Address.SlotIndex;
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lambdaScope[adr] := ArgValues[i];
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end;
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// Create a visitor with the new scope and execute the lambda's body.
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bodyVisitor := visitorFactory(lambdaScope);
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Result := cNode.Body.Accept(bodyVisitor);
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end
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);
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// The result of visiting a lambda node is the callable closure itself.
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Result := closure;
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end;
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function TEvaluatorVisitor.VisitMacroDefinition(const Node: IMacroDefinitionNode): TDataValue;
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begin
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// Macro definitions are compile-time constructs and should have been
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// processed and removed from the AST by the TMacroExpander.
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// If we encounter one here, it's a compiler pipeline error.
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raise Exception.Create('Macro definitions cannot be evaluated at runtime.');
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end;
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function TEvaluatorVisitor.VisitQuasiquote(const Node: IQuasiquoteNode): TDataValue;
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begin
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raise Exception.Create('Quasiquote nodes are a compile-time construct and cannot be evaluated at runtime.');
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end;
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function TEvaluatorVisitor.VisitUnquote(const Node: IUnquoteNode): TDataValue;
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begin
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raise Exception.Create('Unquote nodes are a compile-time construct and cannot be evaluated at runtime.');
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end;
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function TEvaluatorVisitor.VisitUnquoteSplicing(const Node: IUnquoteSplicingNode): TDataValue;
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begin
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raise Exception.Create('Unquote-splicing nodes are a compile-time construct and cannot be evaluated at runtime.');
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end;
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function TEvaluatorVisitor.VisitFunctionCall(const Node: IFunctionCallNode): TDataValue;
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var
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calleeValue: TDataValue;
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argValues: TArray<TDataValue>;
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boundNode: TBoundFunctionCallNode;
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begin
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calleeValue := Node.Callee.Accept(Self);
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if calleeValue.Kind <> vkMethod then
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raise EArgumentException.Create('Expression is not invokable in this context.');
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var argNodes := Node.Arguments;
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SetLength(argValues, Length(argNodes));
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for var i := 0 to High(argNodes) do
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argValues[i] := argNodes[i].Accept(Self);
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boundNode := Node as TBoundFunctionCallNode;
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if boundNode.IsTailCall then
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begin
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// This is a tail call. Return a thunk to be processed by the trampoline.
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Result := TDataValue.FromGeneric<TThunk>(TThunk.Create(calleeValue, argValues));
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end
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else
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begin
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// This is a non-tail call. It must execute the call and act as the trampoline.
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Result := (calleeValue.AsMethod)(argValues);
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HandleTCO(Result);
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end;
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end;
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function TEvaluatorVisitor.VisitRecurNode(const Node: IRecurNode): TDataValue;
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var
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argValues: TArray<TDataValue>;
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calleeAddress: TResolvedAddress;
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calleeValue: TDataValue;
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i: Integer;
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begin
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// The binder ensures this is only in a tail position.
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SetLength(argValues, Length(Node.Arguments));
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for i := 0 to High(Node.Arguments) do
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argValues[i] := Node.Arguments[i].Accept(Self);
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// The callee is the current function, stored in slot 0 of the current scope.
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calleeAddress.Kind := akLocalOrParent;
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calleeAddress.ScopeDepth := 0;
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calleeAddress.SlotIndex := 0;
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calleeValue := FScope[calleeAddress];
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// Recur always returns a thunk for the trampoline.
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Result := TDataValue.FromGeneric<TThunk>(TThunk.Create(calleeValue, argValues));
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end;
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function TEvaluatorVisitor.VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue;
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var
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itemValue, lookbackValue, seriesVar: TDataValue;
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lookback: Int64;
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begin
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seriesVar := FScope[(Node.Series as TBoundIdentifierNode).Address];
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itemValue := Node.Value.Accept(Self);
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lookback := -1;
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if Assigned(Node.Lookback) then
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begin
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lookbackValue := Node.Lookback.Accept(Self);
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if (lookbackValue.Kind <> vkScalar) or (lookbackValue.AsScalar.Kind <> TScalar.TKind.Ordinal) then
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raise EArgumentException.Create('Lookback parameter must be an integer.');
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lookback := lookbackValue.AsScalar.Value.AsInt64;
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end;
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case seriesVar.Kind of
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vkRecordSeries:
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begin
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if (itemValue.Kind <> vkRecord) then
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raise EArgumentException.Create('Can only add record values to a TScalarRecordSeries.');
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with seriesVar.AsRecordSeries do
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begin
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Add(itemValue.AsRecord, lookback);
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end;
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end;
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else
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raise EArgumentException.Create('"add" operation is only supported for series types.');
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end;
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Result := TDataValue.Void;
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end;
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function TEvaluatorVisitor.VisitAssignment(const Node: IAssignmentNode): TDataValue;
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begin
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// Evaluate the new value.
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Result := Node.Value.Accept(Self);
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// Assign it. The scope's SetValues implementation now handles boxing correctly.
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FScope[(Node.Identifier as TBoundIdentifierNode).Address] := Result;
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end;
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function TEvaluatorVisitor.VisitConstant(const Node: IConstantNode): TDataValue;
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begin
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Result := Node.Value;
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end;
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function TEvaluatorVisitor.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
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var
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def: string;
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begin
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def := Node.Definition.Trim;
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if def.StartsWith('[') then
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begin
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var recordDef := TRttiAstHelper.JsonToRecordDefinition(def);
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if Length(recordDef.Fields) = 0 then
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raise EArgumentException.Create('Failed to parse record definition from JSON array.');
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var recordSeries := TScalarRecordSeries.Create(recordDef);
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Result := TDataValue.FromRecordSeries(recordSeries);
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end
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else
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begin
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var scalarKind := TScalar.StringToKind(def);
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Result := TDataValue.FromSeries(TScalarSeries.Create(scalarKind));
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end;
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end;
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function TEvaluatorVisitor.VisitIdentifier(const Node: IIdentifierNode): TDataValue;
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begin
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// The scope's GetValues implementation now handles unboxing automatically.
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Result := FScope[(Node as TBoundIdentifierNode).Address];
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end;
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function TEvaluatorVisitor.VisitIndexer(const Node: IIndexerNode): TDataValue;
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var
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baseValue, indexValue: TDataValue;
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index: Int64;
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begin
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baseValue := Node.Base.Accept(Self);
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indexValue := Node.Index.Accept(Self);
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if (indexValue.Kind <> vkScalar) or (indexValue.AsScalar.Kind <> TScalar.TKind.Ordinal) then
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raise EArgumentException.Create('Indexer `[]` requires an integer argument.');
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index := indexValue.AsScalar.Value.AsInt64;
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case baseValue.Kind of
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vkSeries:
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begin
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with baseValue.AsSeries do
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begin
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if (index < 0) or (index >= TotalCount) then
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raise EArgumentException.CreateFmt('Index %d is out of bounds for series with %d elements.', [index, TotalCount]);
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Result := Items[Integer(index)];
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end;
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end;
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vkRecordSeries:
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begin
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var series := baseValue.AsRecordSeries;
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if (index < 0) or (index >= series.TotalCount) then
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raise EArgumentException.CreateFmt('Index %d is out of bounds for series with %d elements.', [index, series.TotalCount]);
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var recordValue := series.Items[Integer(index)];
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Result := TDataValue.FromRecord(recordValue);
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end;
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else
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raise EArgumentException.Create('Indexer `[]` is not supported for this value type.');
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end;
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end;
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function TEvaluatorVisitor.VisitMemberAccess(const Node: IMemberAccessNode): TDataValue;
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var
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baseValue: TDataValue;
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memberName: string;
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begin
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baseValue := Node.Base.Accept(Self);
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memberName := Node.Member.Name;
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case baseValue.Kind of
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vkRecordSeries: Result := TDataValue.FromSeries(baseValue.AsRecordSeries.CreateMemberSeries(memberName));
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vkRecord: Result := baseValue.AsRecord.Items[memberName];
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else
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raise EArgumentException.Create('Member access operator `.` is not supported for this value type.');
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end;
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end;
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function TEvaluatorVisitor.VisitVariableDeclaration(const Node: IVariableDeclarationNode): TDataValue;
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var
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address: TResolvedAddress;
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boundNode: TBoundVariableDeclarationNode;
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begin
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// First, evaluate the initializer to get the variable's initial value.
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if Assigned(Node.Initializer) then
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Result := Node.Initializer.Accept(Self)
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else
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Result := TDataValue.Void;
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// After binding, all declaration nodes are TBoundVariableDeclarationNode
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boundNode := Node as TBoundVariableDeclarationNode;
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address := (boundNode.Identifier as TBoundIdentifierNode).Address;
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// Check the IsBoxed flag set by the binder.
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if boundNode.IsBoxed then
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begin
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// This is a captured variable. Use the clean scope method to create the box.
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Assert(address.ScopeDepth = 0);
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FScope.DefineBoxed(address.SlotIndex, Result);
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end
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else
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begin
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// This is a standard local variable. Store the raw value directly.
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FScope[address] := Result;
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end;
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end;
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function TEvaluatorVisitor.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
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var
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leftValue, rightValue: TDataValue;
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begin
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leftValue := Node.Left.Accept(Self);
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rightValue := Node.Right.Accept(Self);
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if (leftValue.Kind <> vkScalar) or (rightValue.Kind <> vkScalar) then
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raise ENotSupportedException.Create('Binary operations are only supported for scalar types.');
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var res: TScalar;
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if not TScalar.TryBinaryOperation(Node.Operator, leftValue.AsScalar, rightValue.AsScalar, res) then
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raise ENotSupportedException.Create(
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'Binary operation not supported for scalar types '
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+ leftValue.AsScalar.Kind.ToString
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+ ' and '
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+ rightValue.AsScalar.Kind.ToString
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+ ' .');
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Result := res;
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end;
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function TEvaluatorVisitor.VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue;
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var
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rightValue: TDataValue;
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begin
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rightValue := Node.Right.Accept(Self);
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if rightValue.Kind <> vkScalar then
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raise ENotSupportedException.Create('Unary operations are only supported for scalar types.');
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var res: TScalar;
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if not TScalar.TryUnaryOperation(Node.Operator, rightValue.AsScalar, res) then
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raise ENotSupportedException.Create('Unary operation not supported for scalar type' + rightValue.AsScalar.Kind.ToString + '.');
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Result := res;
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end;
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|
|
|
function TEvaluatorVisitor.VisitIfExpression(const Node: IIfExpressionNode): TDataValue;
|
|
begin
|
|
if IsTruthy(Node.Condition.Accept(Self)) then
|
|
Result := Node.ThenBranch.Accept(Self)
|
|
else if Assigned(Node.ElseBranch) then
|
|
Result := Node.ElseBranch.Accept(Self)
|
|
else
|
|
Result := TDataValue.Void;
|
|
end;
|
|
|
|
function TEvaluatorVisitor.VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue;
|
|
begin
|
|
if IsTruthy(Node.Condition.Accept(Self)) then
|
|
Result := Node.ThenBranch.Accept(Self)
|
|
else
|
|
Result := Node.ElseBranch.Accept(Self);
|
|
end;
|
|
|
|
function TEvaluatorVisitor.VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue;
|
|
var
|
|
expression: IAstNode;
|
|
begin
|
|
Result := TDataValue.Void;
|
|
for expression in Node.Expressions do
|
|
Result := expression.Accept(Self);
|
|
end;
|
|
|
|
function TEvaluatorVisitor.VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue;
|
|
var
|
|
seriesValue: TDataValue;
|
|
len: Int64;
|
|
begin
|
|
seriesValue := FScope[(Node.Series as TBoundIdentifierNode).Address];
|
|
|
|
case seriesValue.Kind of
|
|
vkSeries: len := seriesValue.AsSeries.Count;
|
|
vkRecordSeries: len := seriesValue.AsRecordSeries.Count;
|
|
else
|
|
raise EArgumentException.CreateFmt('Cannot get length of type %s.', [GetEnumName(TypeInfo(TDataValueKind), Ord(seriesValue.Kind))]);
|
|
end;
|
|
|
|
Result := TScalar.FromInt64(len);
|
|
end;
|
|
|
|
end.
|