Keywords

ASTPlayground/MainForm.pas

@@ -800,7 +800,8 @@ begin
                 [
                     TAst.VarDecl(
                         TAst.Identifier('closeColumn'),
-                        TAst.MemberAccess(TAst.Identifier('ohlcvSeries'), TAst.Identifier('Close'))
+                        TAst.FunctionCall(TAst.Keyword('Close'), [TAst.Identifier('ohlcvSeries')])
+                            //                        TAst.MemberAccess(TAst.Identifier('ohlcvSeries'), TAst.Identifier('Close'))
                     ),
                     TAst.Indexer(TAst.Identifier('closeColumn'), TAst.Constant(1))
                 ]
@@ -1319,7 +1320,7 @@ end;
 
 procedure TForm1.UpdateScript;
 begin
-    PrintScript(FCurrAst);
+    PrintScript(FCurrUnboundAst);
 
     FWorkspace.DeleteChildren;
     ShowVizualization(14, 14);

ASTPlayground/Myc.Fmx.AstEditor.Node.pas

@@ -64,6 +64,7 @@ type
         // Visitor implementations for each AST node type.
         function VisitConstant(const Node: IConstantNode): TDataValue; override;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
@@ -80,6 +81,7 @@ type
         function VisitUnquoteSplicing(const Node: IUnquoteSplicingNode): TDataValue; override;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
@@ -242,6 +244,17 @@ type
         property Node: IIdentifierNode read FNode;
     end;
 
+    TAuraKeywordNode = class(TAuraNode)
+    private
+        FNode: IKeywordNode;
+    protected
+        procedure SetupNode; override;
+    public
+        constructor Create(const AVisualizer: IAstVisualizer; const ANode: IKeywordNode);
+        function CreateAst: IAstNode; override;
+        property Node: IKeywordNode read FNode;
+    end;
+
     TAuraBinaryExpressionNode = class(TAuraNode)
     private
         FNode: IBinaryExpressionNode;
@@ -462,6 +475,19 @@ type
         property Node: IMemberAccessNode read FNode;
     end;
 
+    TAuraRecordLiteralNode = class(TAuraNode)
+    private
+        FNode: IRecordLiteralNode;
+        FFieldNodes: TDictionary<string, TAuraNode>; // Map KeyName -> ValueNode
+    protected
+        procedure SetupNode; override;
+    public
+        constructor Create(const AVisualizer: IAstVisualizer; const ANode: IRecordLiteralNode);
+        destructor Destroy; override;
+        function CreateAst: IAstNode; override;
+        property Node: IRecordLiteralNode read FNode;
+    end;
+
     TAuraCreateSeriesNode = class(TAuraNode)
     private
         FNode: ICreateSeriesNode;
@@ -499,6 +525,9 @@ type
 
 implementation
 
+uses
+    Myc.Data.Keyword;
+
 { TAstVisualizer }
 
 constructor TAstVisualizer.Create(AWorkspace: TAuraWorkspace; AParentControl: TControl; AExprDepth: Integer);
@@ -588,6 +617,11 @@ begin
     Result := TDataValue.FromGeneric<TAuraNode>(TAuraIdentifierNode.Create(Self, Node));
 end;
 
+function TAstVisualizer.VisitKeyword(const Node: IKeywordNode): TDataValue;
+begin
+    Result := TDataValue.FromGeneric<TAuraNode>(TAuraKeywordNode.Create(Self, Node));
+end;
+
 function TAstVisualizer.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
 begin
     Result := TDataValue.FromGeneric<TAuraNode>(TAuraBinaryExpressionNode.Create(Self, Node));
@@ -643,6 +677,11 @@ begin
     Result := TDataValue.FromGeneric<TAuraNode>(TAuraMemberAccessNode.Create(Self, Node));
 end;
 
+function TAstVisualizer.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+begin
+    Result := TDataValue.FromGeneric<TAuraNode>(TAuraRecordLiteralNode.Create(Self, Node));
+end;
+
 function TAstVisualizer.VisitQuasiquote(const Node: IQuasiquoteNode): TDataValue;
 begin
     Result := TDataValue.FromGeneric<TAuraNode>(TAuraQuasiquoteNode.Create(Self, Node));
@@ -1201,6 +1240,32 @@ begin
     end;
 end;
 
+{ TAuraKeywordNode }
+
+constructor TAuraKeywordNode.Create(const AVisualizer: IAstVisualizer; const ANode: IKeywordNode);
+begin
+    inherited Create(AVisualizer);
+    FNode := ANode;
+end;
+
+function TAuraKeywordNode.CreateAst: IAstNode;
+begin
+    Result := FNode; // Keywords are literals, return original node
+end;
+
+procedure TAuraKeywordNode.SetupNode;
+begin
+    BeginUpdate;
+    try
+        Frameless := true;
+        var lbl := AddLabel(Self, ':' + FNode.Value.Name);
+        lbl.StyledSettings := lbl.StyledSettings - [TStyledSetting.FontColor];
+        lbl.FontColor := TAlphaColors.Mediumvioletred;
+    finally
+        EndUpdate;
+    end;
+end;
+
 { TAuraBinaryExpressionNode }
 
 constructor TAuraBinaryExpressionNode.Create(const AVisualizer: IAstVisualizer; const ANode: IBinaryExpressionNode);
@@ -1883,7 +1948,7 @@ begin
         leftBracket.Padding.Right := 0;
         leftBracket.Margins.Right := 0;
 
-        visu.CallAccept(FNode.Expression);
+        FExpressionNode := visu.CallAccept(FNode.Expression);
 
         var rightBracket := AddLabel(Self, '>');
         rightBracket.Padding.Left := 0;
@@ -1990,6 +2055,83 @@ begin
     end;
 end;
 
+{ TAuraRecordLiteralNode }
+
+constructor TAuraRecordLiteralNode.Create(const AVisualizer: IAstVisualizer; const ANode: IRecordLiteralNode);
+begin
+    inherited Create(AVisualizer);
+    FNode := ANode;
+    FFieldNodes := TDictionary<string, TAuraNode>.Create;
+end;
+
+destructor TAuraRecordLiteralNode.Destroy;
+begin
+    FFieldNodes.Free;
+    inherited Destroy;
+end;
+
+function TAuraRecordLiteralNode.CreateAst: IAstNode;
+var
+    fields: TArray<TRecordFieldLiteral>;
+    i: Integer;
+    valueNode: TAuraNode;
+    pair: TPair<string, TAuraNode>;
+begin
+    SetLength(fields, FFieldNodes.Count);
+    i := 0;
+    // Note: TDictionary iteration order is not guaranteed,
+    // but TScalarRecordDefinition is looked up by name, so order doesn't matter.
+    for pair in FFieldNodes do
+    begin
+        valueNode := pair.Value;
+        fields[i] := TRecordFieldLiteral.Create(pair.Key, valueNode.CreateAst);
+        inc(i);
+    end;
+    Result := TAst.RecordLiteral(fields);
+end;
+
+procedure TAuraRecordLiteralNode.SetupNode;
+var
+    field: TRecordFieldLiteral;
+    fieldContainer: TAutoFitControl;
+    valueNode: TAuraNode;
+    keyLabel: TLabel;
+begin
+    BeginUpdate;
+    try
+        Frameless := False;
+        Orientation := loVertical;
+        Alignment := laFlush; // Align fields to the left
+
+        if Length(FNode.Fields) = 0 then
+        begin
+            AddLabel(Self, '{}');
+        end
+        else
+        begin
+            for field in FNode.Fields do
+            begin
+                // Create a horizontal container for the key-value pair
+                fieldContainer := AddContainer(Self, loHorizontal, laCenter);
+
+                // Key label
+                keyLabel := AddLabel(fieldContainer, ':' + field.Name);
+                keyLabel.Font.Style := keyLabel.Font.Style + [TFontStyle.fsBold];
+                keyLabel.StyledSettings := keyLabel.StyledSettings - [TStyledSetting.FontColor];
+                keyLabel.FontColor := TAlphaColors.Mediumvioletred;
+
+                // Value node
+                valueNode := FVisualizer.Clone(fieldContainer, FVisualizer.ExprDepth + 1).CallAccept(field.Value);
+
+                // Store for CreateAst
+                FFieldNodes.Add(field.Name, valueNode);
+            end;
+        end;
+    finally
+        EndUpdate;
+    end;
+end;
+
 { TAuraCreateSeriesNode }
 
 constructor TAuraCreateSeriesNode.Create(const AVisualizer: IAstVisualizer; const ANode: ICreateSeriesNode);

Src/AST/Myc.Ast.Binding.pas

@@ -12,7 +12,7 @@ uses
     Myc.Ast.Visitor,
     Myc.Ast.Scope,
     Myc.Ast.Analyzer,
-    Myc.Ast.Types, // Added
+    Myc.Ast.Types,
     Myc.Ast;
 
 type
@@ -35,6 +35,7 @@ type
         function VisitUnquoteSplicing(const Node: IUnquoteSplicingNode): TDataValue; override;
         function VisitFunctionCall(const Node: IFunctionCallNode): TDataValue; override;
         function VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
     public
         constructor Create(const AMacroScope: IExecutionScope; const AEvaluate: TEvaluateProc);
         class function Expand(const MacroScope: IExecutionScope; const RootNode: IAstNode; const AEvaluate: TEvaluateProc): IAstNode;
@@ -70,6 +71,7 @@ type
     protected
         function Accept(const Node: IAstNode): TDataValue; override;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
         function VisitVariableDeclaration(const Node: IVariableDeclarationNode): TDataValue; override;
         function VisitAssignment(const Node: IAssignmentNode): TDataValue; override;
         function VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue; override;
@@ -82,10 +84,10 @@ type
         function VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue; override;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
-        // Added for type inference
         function VisitConstant(const Node: IConstantNode): TDataValue; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
@@ -151,11 +153,20 @@ type
         property IsTailCall: Boolean read FIsTailCall;
     end;
 
+    TBoundRecordLiteralNode = class(TRecordLiteralNode)
+    private
+        FDefinition: TScalarRecordDefinition;
+    public
+        constructor Create(const AFields: TArray<TRecordFieldLiteral>; const ADef: TScalarRecordDefinition);
+        property Definition: TScalarRecordDefinition read FDefinition;
+    end;
+
 implementation
 
 uses
     System.Generics.Defaults,
-    System.Character;
+    System.Character,
+    Myc.Data.Keyword;
 
 type
     TResolvedAddressComparer = class(TEqualityComparer<TResolvedAddress>)
@@ -248,7 +259,7 @@ begin
     // externally evaluate the expression using the injected evaluator
     value := FEvaluate(expr);
 
-    if value.Kind in [vkScalar, vkText, vkVoid] then
+    if value.Kind in [vkScalar, vkText, vkVoid, vkKeyword] then
         Result := TDataValue.FromIntf<IAstNode>(TAst.Constant(value))
     else
         raise Exception.CreateFmt('Cannot unquote complex value of type %s at compile time.', [value.Kind.ToString]);
@@ -277,6 +288,13 @@ begin
     Result := TDataValue.FromIntf<IBlockExpressionNode>(TAst.Block(newExprs));
 end;
 
+function TExpansionVisitor.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+begin
+    // This node type does not support splicing, so we use the default
+    // TAstTransformer implementation which just transforms child values.
+    Result := inherited VisitRecordLiteral(Node);
+end;
+
 { TBoundIdentifierNode }
 constructor TBoundIdentifierNode.Create(const AUnboundNode: IIdentifierNode; const AAddress: TResolvedAddress);
 begin
@@ -319,6 +337,13 @@ begin
     FIsTailCall := AIsTailCall;
 end;
 
+{ TBoundRecordLiteralNode }
+constructor TBoundRecordLiteralNode.Create(const AFields: TArray<TRecordFieldLiteral>; const ADef: TScalarRecordDefinition);
+begin
+    inherited Create(AFields);
+    FDefinition := ADef;
+end;
+
 { TResolvedAddressComparer }
 function TResolvedAddressComparer.Equals(const Left, Right: TResolvedAddress): Boolean;
 begin
@@ -474,6 +499,31 @@ var
     args: TArray<IAstNode>;
     i: Integer;
 begin
+    // --- Transformation: Keyword-as-Function ---
+    if (Node.Callee is TKeywordNode) then
+    begin
+        var keywordNode := (Node.Callee as TKeywordNode);
+        var keywordName := keywordNode.Value.Name;
+
+        // 1. Validate argument count
+        if Length(Node.Arguments) <> 1 then
+            raise ETypeException
+                .CreateFmt('Keyword :%s expects exactly one argument (the record), but got %d', [keywordName, Length(Node.Arguments)]);
+
+        // 2. Bind the base (the record)
+        FNextIsTail := False; // Accessing a member is not a tail call
+        var baseNode := Accept(Node.Arguments[0]).AsIntf<IAstNode>;
+
+        // 3. Create a synthetic IMemberAccessNode
+        var memberIdentifier := TAst.Identifier(keywordName);
+        var memberAccessNode := TAst.MemberAccess(baseNode, memberIdentifier);
+
+        // 4. Re-bind the synthetic node by calling Accept (which dispatches to VisitMemberAccess)
+        // This ensures type checking and type inference for member access is done in one place.
+        Result := Accept(memberAccessNode);
+        exit;
+    end;
+
     if (Node.Callee is TIdentifierNode) then
     begin
         calleeIdentifier := Node.Callee as TIdentifierNode;
@@ -592,10 +642,10 @@ begin
     // Check argument types (param types are not yet inferred, so skip check for now)
     // for i := 0 to High(args) do
     // begin
-    //    var argType := (args[i] as TAstNode).StaticType;
+    //     var argType := (args[i] as TAstNode).StaticType;
-    //    var paramType := signature.ParamTypes[i];
+    //     var paramType := signature.ParamTypes[i];
-    //    if not TTypeRules.CanAssign(paramType, argType) then
+    //     if not TTypeRules.CanAssign(paramType, argType) then
-    //       raise ETypeException.CreateFmt('Cannot assign argument %d (type %s) to parameter (type %s)', [i, argType.ToString, paramType.ToString]);
+    //         raise ETypeException.CreateFmt('Cannot assign argument %d (type %s) to parameter (type %s)', [i, argType.ToString, paramType.ToString]);
     // end;
 
     boundCall := TBoundFunctionCallNode.Create(Node, callee, args, isTailCall);
@@ -738,12 +788,19 @@ begin
             Result := SetType(TDataValue.FromIntf<IConstantNode>(Node), TTypes.FromScalarKind(Node.Value.AsScalar.Kind));
         TDataValueKind.vkText: Result := SetType(TDataValue.FromIntf<IConstantNode>(Node), TTypes.Text);
         TDataValueKind.vkVoid: Result := SetType(TDataValue.FromIntf<IConstantNode>(Node), TTypes.Void);
+        TDataValueKind.vkKeyword: Result := SetType(TDataValue.FromIntf<IConstantNode>(Node), TTypes.Keyword);
     else
         // Handle other constant types if they become supported
         Result := SetType(TDataValue.FromIntf<IConstantNode>(Node), TTypes.Unknown);
     end;
 end;
 
+function TAstBinder.VisitKeyword(const Node: IKeywordNode): TDataValue;
+begin
+    // Keywords are literals. Their type is set in TKeywordNode.Create.
+    Result := TDataValue.FromIntf<IKeywordNode>(Node);
+end;
+
 function TAstBinder.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
 var
     elemType: IStaticType;
@@ -892,6 +949,50 @@ begin
     Result := SetType(TDataValue.FromIntf<IMemberAccessNode>(boundNode), elemType);
 end;
 
+function TAstBinder.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+var
+    i: Integer;
+    boundFields: TArray<TRecordFieldLiteral>;
+    defFields: TArray<TScalarRecordField>;
+    def: TScalarRecordDefinition;
+    staticType: IStaticType;
+    boundNode: IRecordLiteralNode;
+    valNode: IAstNode;
+    valType: IStaticType;
+begin
+    FNextIsTail := False;
+    SetLength(boundFields, Length(Node.Fields));
+    SetLength(defFields, Length(Node.Fields));
+
+    for i := 0 to High(Node.Fields) do
+    begin
+        valNode := Accept(Node.Fields[i].Value).AsIntf<IAstNode>;
+        valType := (valNode as TAstNode).StaticType;
+
+        // Records can only store scalar values
+        if not (valType.Kind in [stOrdinal, stFloat]) then
+            raise ETypeException.CreateFmt(
+                'Record fields must be scalar (Ordinal or Float), but field "%s" is %s',
+                [Node.Fields[i].Name, valType.ToString]);
+
+        boundFields[i] := TRecordFieldLiteral.Create(Node.Fields[i].Name, valNode);
+
+        var scalarKind: TScalar.TKind;
+        if valType.Kind = stOrdinal then
+            scalarKind := TScalar.TKind.Ordinal
+        else
+            scalarKind := TScalar.TKind.Float;
+
+        defFields[i] := TScalarRecordField.Create(Node.Fields[i].Name, scalarKind);
+    end;
+
+    def := TScalarRecordDefinition.Create(defFields);
+    staticType := TTypes.CreateRecord(def);
+    boundNode := TBoundRecordLiteralNode.Create(boundFields, def);
+
+    Result := SetType(TDataValue.FromIntf<IRecordLiteralNode>(boundNode), staticType);
+end;
+
 function TAstBinder.VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue;
 var
     i: integer;

Src/AST/Myc.Ast.Debugger.pas

@@ -35,6 +35,7 @@ type
         // The logging overrides for other Visit... methods
         function VisitConstant(const Node: IConstantNode): TDataValue; override;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
@@ -44,6 +45,7 @@ type
         function VisitAssignment(const Node: IAssignmentNode): TDataValue; override;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
@@ -52,7 +54,8 @@ type
 implementation
 
 uses
-    System.TypInfo;
+    System.TypInfo,
+    Myc.Data.Keyword;
 
 { TDebugEvaluatorVisitor }
 
@@ -156,8 +159,14 @@ end;
 
 function TDebugEvaluatorVisitor.VisitConstant(const Node: IConstantNode): TDataValue;
 begin
-    AppendLine(Format('Constant (%s)', [Node.Value.ToString]));
     Result := inherited VisitConstant(Node);
+    AppendLine(Format('Constant (%s)', [Result.ToString]));
+end;
+
+function TDebugEvaluatorVisitor.VisitKeyword(const Node: IKeywordNode): TDataValue;
+begin
+    Result := inherited VisitKeyword(Node);
+    AppendLine(Format('Keyword (%s)', [Result.ToString]));
 end;
 
 function TDebugEvaluatorVisitor.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
@@ -238,6 +247,18 @@ begin
     AppendLine(Format('} -> %s', [Result.ToString]));
 end;
 
+function TDebugEvaluatorVisitor.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+begin
+    AppendLine('RecordLiteral {');
+    Indent;
+    try
+        Result := inherited VisitRecordLiteral(Node);
+    finally
+        Unindent;
+    end;
+    AppendLine(Format('} -> %s', [Result.ToString]));
+end;
+
 function TDebugEvaluatorVisitor.VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue;
 begin
     AppendLine('TernaryExpr{');

Src/AST/Myc.Ast.Dumper.pas

@@ -31,6 +31,7 @@ type
     protected
         function VisitConstant(const Node: IConstantNode): TDataValue; override;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
@@ -48,6 +49,7 @@ type
         function VisitUnquoteSplicing(const Node: IUnquoteSplicingNode): TDataValue; override;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
@@ -65,6 +67,7 @@ type
 implementation
 
 uses
+    Myc.Data.Keyword,
     Myc.Ast.Binding; // For TBound...Node classes
 
 { TAstDumper }
@@ -144,6 +147,12 @@ begin
     Result := TDataValue.Void;
 end;
 
+function TAstDumper.VisitKeyword(const Node: IKeywordNode): TDataValue;
+begin
+    LogFmt('Keyword: :%s', [Node.Value.Name]);
+    Result := TDataValue.Void;
+end;
+
 function TAstDumper.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
 begin
     LogFmt('BinaryExpression: %s', [Node.Operator.ToString]);
@@ -432,6 +441,23 @@ begin
     Result := TDataValue.Void;
 end;
 
+function TAstDumper.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+var
+    field: TRecordFieldLiteral;
+begin
+    LogFmt('RecordLiteral (%d fields)', [Length(Node.Fields)]);
+    Indent;
+    for field in Node.Fields do
+    begin
+        LogFmt('Field :%s', [field.Name]);
+        Indent;
+        field.Value.Accept(Self);
+        Unindent;
+    end;
+    Unindent;
+    Result := TDataValue.Void;
+end;
+
 function TAstDumper.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
 begin
     LogFmt('CreateSeries: %s', [Node.Definition]);

Src/AST/Myc.Ast.Evaluator.pas

@@ -23,6 +23,7 @@ type
     protected
         function VisitConstant(const Node: IConstantNode): TDataValue; override;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
@@ -39,6 +40,7 @@ type
         function VisitAssignment(const Node: IAssignmentNode): TDataValue; override;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
@@ -65,6 +67,7 @@ implementation
 uses
     System.TypInfo,
     System.Generics.Defaults,
+    Myc.Data.Keyword,
     Myc.Data.Decimal,
     Myc.Data.Series,
     Myc.Data.Scalar.JSON;
@@ -363,6 +366,12 @@ begin
     Result := Node.Value;
 end;
 
+function TEvaluatorVisitor.VisitKeyword(const Node: IKeywordNode): TDataValue;
+begin
+    // Return the shared, interned IKeyword interface as a TDataValue
+    Result := TDataValue.FromKeyword(Node.Value);
+end;
+
 function TEvaluatorVisitor.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
 var
     def: string;
@@ -441,6 +450,30 @@ begin
     end;
 end;
 
+function TEvaluatorVisitor.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+var
+    boundNode: TBoundRecordLiteralNode;
+    values: TArray<TScalar.TValue>;
+    i: Integer;
+    valData: TDataValue;
+begin
+    // The node must be a bound node from the binder
+    boundNode := Node as TBoundRecordLiteralNode;
+    SetLength(values, Length(boundNode.Fields));
+
+    for i := 0 to High(boundNode.Fields) do
+    begin
+        // Evaluate the value expression for this field
+        valData := boundNode.Fields[i].Value.Accept(Self);
+        // The binder already validated this is a scalar
+        values[i] := valData.AsScalar.Value;
+    end;
+
+    // Create the TScalarRecord using the definition from the binder
+    var rec := TScalarRecord.Create(boundNode.Definition, values);
+    Result := TDataValue.FromRecord(rec);
+end;
+
 function TEvaluatorVisitor.VisitVariableDeclaration(const Node: IVariableDeclarationNode): TDataValue;
 var
     address: TResolvedAddress;
@@ -473,22 +506,46 @@ end;
 function TEvaluatorVisitor.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
 var
     leftValue, rightValue: TDataValue;
+    resScalar: TScalar;
 begin
     leftValue := Node.Left.Accept(Self);
     rightValue := Node.Right.Accept(Self);
 
-    if (leftValue.Kind <> vkScalar) or (rightValue.Kind <> vkScalar) then
+    // Handle Keyword equality
-        raise ENotSupportedException.Create('Binary operations are only supported for scalar types.');
+    if (leftValue.Kind = vkKeyword) or (rightValue.Kind = vkKeyword) then
+    begin
+        if not (leftValue.Kind = rightValue.Kind) then
+        begin
+            // Comparing keyword to non-keyword
+            if Node.Operator = TScalar.TBinaryOp.NotEqual then
+                Result := TScalar.FromInt64(1)
+            else
+                Result := TScalar.FromInt64(0);
+            exit;
+        end;
 
-    var res: TScalar;
+        // Both are keywords, compare interfaces
-    if not TScalar.TryBinaryOperation(Node.Operator, leftValue.AsScalar, rightValue.AsScalar, res) then
+        case Node.Operator of
+            TScalar.TBinaryOp.Equal: Result := TScalar.FromInt64(Ord(leftValue.AsKeyword = rightValue.AsKeyword));
+            TScalar.TBinaryOp.NotEqual: Result := TScalar.FromInt64(Ord(leftValue.AsKeyword <> rightValue.AsKeyword));
+        else
+            raise ENotSupportedException.Create('Only = and <> operations are supported for Keywords.');
+        end;
+        exit;
+    end;
+
+    // Standard scalar operations
+    if (leftValue.Kind <> vkScalar) or (rightValue.Kind <> vkScalar) then
+        raise ENotSupportedException.Create('Binary operations are only supported for scalar or keyword types.');
+
+    if not TScalar.TryBinaryOperation(Node.Operator, leftValue.AsScalar, rightValue.AsScalar, resScalar) then
         raise ENotSupportedException.Create(
             'Binary operation not supported for scalar types '
                 + leftValue.AsScalar.Kind.ToString
                 + ' and '
                 + rightValue.AsScalar.Kind.ToString
                 + ' .');
-    Result := res;
+    Result := resScalar;
 end;
 
 function TEvaluatorVisitor.VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue;

Src/AST/Myc.Ast.JSON.pas

@@ -29,6 +29,7 @@ type
 
         function JsonToConstantNode(const AObj: TJSONObject): IConstantNode;
         function JsonToIdentifierNode(const AObj: TJSONObject): IIdentifierNode;
+        function JsonToKeywordNode(const AObj: TJSONObject): IKeywordNode;
         function JsonToBinaryExprNode(const AObj: TJSONObject): IBinaryExpressionNode;
         function JsonToUnaryExprNode(const AObj: TJSONObject): IUnaryExpressionNode;
         function JsonToIfExprNode(const AObj: TJSONObject): IIfExpressionNode;
@@ -46,6 +47,7 @@ type
         function JsonToAssignmentNode(const AObj: TJSONObject): IAssignmentNode;
         function JsonToIndexerNode(const AObj: TJSONObject): IIndexerNode;
         function JsonToMemberAccessNode(const AObj: TJSONObject): IMemberAccessNode;
+        function JsonToRecordLiteralNode(const AObj: TJSONObject): IRecordLiteralNode;
         function JsonToCreateSeriesNode(const AObj: TJSONObject): ICreateSeriesNode;
         function JsonToAddSeriesItemNode(const AObj: TJSONObject): IAddSeriesItemNode;
         function JsonToSeriesLengthNode(const AObj: TJSONObject): ISeriesLengthNode;
@@ -53,6 +55,7 @@ type
         // IAstVisitor implementation for serialization
         function VisitConstant(const Node: IConstantNode): TDataValue; override;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
@@ -70,6 +73,7 @@ type
         function VisitAssignment(const Node: IAssignmentNode): TDataValue; override;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
@@ -83,6 +87,9 @@ type
 
 implementation
 
+uses
+    Myc.Data.Keyword;
+
 { TJsonAstConverter }
 
 constructor TJsonAstConverter.Create;
@@ -123,6 +130,7 @@ begin
             valObj.AddPair('Value', scalarObj);
         end;
         vkText: valObj.AddPair('Value', TJSONString.Create(AValue.AsText));
+        vkKeyword: valObj.AddPair('Value', TJSONString.Create(AValue.AsKeyword.Name));
         vkVoid:; // No value to add
     else
         raise ENotSupportedException.Create('Unsupported TDataValue kind for constant serialization.');
@@ -153,6 +161,17 @@ begin
     Result := TDataValue.Void;
 end;
 
+function TJsonAstConverter.VisitKeyword(const Node: IKeywordNode): TDataValue;
+var
+    obj: TJSONObject;
+begin
+    obj := TJSONObject.Create;
+    obj.AddPair('NodeType', TJSONString.Create('Keyword'));
+    obj.AddPair('Name', TJSONString.Create(Node.Value.Name));
+    FJsonObjectStack.Push(obj);
+    Result := TDataValue.Void;
+end;
+
 function TJsonAstConverter.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
 var
     obj, leftObj, rightObj: TJSONObject;
@@ -544,6 +563,31 @@ begin
     Result := TDataValue.Void;
 end;
 
+function TJsonAstConverter.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+var
+    obj, fieldObj: TJSONObject;
+    fieldsArray: TJSONArray;
+    field: TRecordFieldLiteral;
+begin
+    obj := TJSONObject.Create;
+    obj.AddPair('NodeType', TJSONString.Create('RecordLiteral'));
+
+    fieldsArray := TJSONArray.Create;
+    for field in Node.Fields do
+    begin
+        field.Value.Accept(Self); // This pushes the value JSON onto the stack
+
+        fieldObj := TJSONObject.Create;
+        fieldObj.AddPair('Name', TJSONString.Create(field.Name));
+        fieldObj.AddPair('Value', FJsonObjectStack.Pop);
+        fieldsArray.Add(fieldObj);
+    end;
+
+    obj.AddPair('Fields', fieldsArray);
+    FJsonObjectStack.Push(obj);
+    Result := TDataValue.Void;
+end;
+
 function TJsonAstConverter.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
 var
     obj: TJSONObject;
@@ -622,6 +666,10 @@ begin
     begin
         Result := valObj.GetValue<string>('Value');
     end
+    else if SameText(kindStr, 'Keyword') then
+    begin
+        Result := TDataValue.FromKeyword(TKeywordRegistry.Intern(valObj.GetValue<string>('Value')));
+    end
     else if SameText(kindStr, 'Void') then
     begin
         Result := TDataValue.Void;
@@ -640,6 +688,11 @@ begin
     Result := TAst.Identifier(AObj.GetValue<string>('Name'));
 end;
 
+function TJsonAstConverter.JsonToKeywordNode(const AObj: TJSONObject): IKeywordNode;
+begin
+    Result := TAst.Keyword(AObj.GetValue<string>('Name'));
+end;
+
 function TJsonAstConverter.JsonToBinaryExprNode(const AObj: TJSONObject): IBinaryExpressionNode;
 var
     opStr: string;
@@ -850,6 +903,23 @@ begin
     Result := TAst.MemberAccess(JsonToNode(AObj.GetValue('Base')), JsonToIdentifierNode(AObj.GetValue('Member') as TJSONObject));
 end;
 
+function TJsonAstConverter.JsonToRecordLiteralNode(const AObj: TJSONObject): IRecordLiteralNode;
+var
+    fields: TArray<TRecordFieldLiteral>;
+    fieldsArray: TJSONArray;
+    fieldObj: TJSONObject;
+    i: Integer;
+begin
+    fieldsArray := AObj.GetValue<TJSONArray>('Fields');
+    SetLength(fields, fieldsArray.Count);
+    for i := 0 to fieldsArray.Count - 1 do
+    begin
+        fieldObj := fieldsArray.Items[i] as TJSONObject;
+        fields[i] := TRecordFieldLiteral.Create(fieldObj.GetValue<string>('Name'), JsonToNode(fieldObj.GetValue('Value')));
+    end;
+    Result := TAst.RecordLiteral(fields);
+end;
+
 function TJsonAstConverter.JsonToCreateSeriesNode(const AObj: TJSONObject): ICreateSeriesNode;
 begin
     Result := TAst.CreateSeries(AObj.GetValue<string>('Definition'));
@@ -891,6 +961,8 @@ begin
         Result := JsonToConstantNode(obj)
     else if nodeType = 'Identifier' then
         Result := JsonToIdentifierNode(obj)
+    else if nodeType = 'Keyword' then
+        Result := JsonToKeywordNode(obj)
     else if nodeType = 'BinaryExpr' then
         Result := JsonToBinaryExprNode(obj)
     else if nodeType = 'UnaryExpr' then
@@ -925,6 +997,8 @@ begin
         Result := JsonToIndexerNode(obj)
     else if nodeType = 'MemberAccess' then
         Result := JsonToMemberAccessNode(obj)
+    else if nodeType = 'RecordLiteral' then
+        Result := JsonToRecordLiteralNode(obj)
     else if nodeType = 'CreateSeries' then
         Result := JsonToCreateSeriesNode(obj)
     else if nodeType = 'AddSeriesItem' then

Src/AST/Myc.Ast.Nodes.pas

@@ -6,7 +6,8 @@ uses
     System.SysUtils,
     System.Generics.Collections,
     Myc.Data.Scalar,
-    Myc.Data.Value;
+    Myc.Data.Value,
+    Myc.Data.Keyword;
 
 type
     // --- Forward Declarations to break cycles ---
@@ -14,6 +15,7 @@ type
     IAstNode = interface;
     IIdentifierNode = interface;
     IConstantNode = interface;
+    IKeywordNode = interface;
     IBinaryExpressionNode = interface;
     IUnaryExpressionNode = interface;
     IIfExpressionNode = interface;
@@ -30,6 +32,7 @@ type
     IUnquoteSplicingNode = interface;
     IIndexerNode = interface;
     IMemberAccessNode = interface;
+    IRecordLiteralNode = interface;
     ICreateSeriesNode = interface;
     IAddSeriesItemNode = interface;
     ISeriesLengthNode = interface;
@@ -50,9 +53,17 @@ type
         class operator Equal(const A: TResolvedAddress; B: TResolvedAddress): Boolean;
     end;
 
+    // A single field in a record literal
+    TRecordFieldLiteral = record
+        Name: string; // The field name (from keyword :name)
+        Value: IAstNode;
+        constructor Create(const AName: string; const AValue: IAstNode);
+    end;
+
     IAstVisitor = interface
         function VisitConstant(const Node: IConstantNode): TDataValue;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue;
@@ -69,6 +80,7 @@ type
         function VisitUnquoteSplicing(const Node: IUnquoteSplicingNode): TDataValue;
         function VisitIndexer(const Node: IIndexerNode): TDataValue;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue;
@@ -94,6 +106,15 @@ type
         property Name: string read GetName;
     end;
 
+    // Represents a keyword literal in the AST (e.g., :foo)
+    IKeywordNode = interface(IAstNode)
+        {$region 'private'}
+        function GetValue: IKeyword;
+        {$endregion}
+        // The interned keyword object
+        property Value: IKeyword read GetValue;
+    end;
+
     IBinaryExpressionNode = interface(IAstNode)
         {$region 'private'}
         function GetLeft: IAstNode;
@@ -249,6 +270,14 @@ type
         property Member: IIdentifierNode read GetMember;
     end;
 
+    // Represents a record literal, e.g., {:a 1 :b 2}
+    IRecordLiteralNode = interface(IAstNode)
+        {$region 'private'}
+        function GetFields: TArray<TRecordFieldLiteral>;
+        {$endregion}
+        property Fields: TArray<TRecordFieldLiteral> read GetFields;
+    end;
+
     ICreateSeriesNode = interface(IAstNode)
         {$region 'private'}
         function GetDefinition: String;
@@ -304,4 +333,12 @@ begin
     Dest.SlotIndex := -1;
 end;
 
+{ TRecordFieldLiteral }
+
+constructor TRecordFieldLiteral.Create(const AName: string; const AValue: IAstNode);
+begin
+    Name := AName;
+    Value := AValue;
+end;
+
 end.

Src/AST/Myc.Ast.Script.pas

@@ -24,6 +24,7 @@ uses
     System.Math,
     Myc.Data.Scalar,
     Myc.Data.Value,
+    Myc.Data.Keyword,
     Myc.Ast;
 
 type
@@ -35,11 +36,14 @@ type
         tkRightParen, // )
         tkLeftBracket, // [
         tkRightBracket, // ]
+        tkLeftBrace, // {
+        tkRightBrace, // }
         tkQuote, // '
         tkBacktick, // `
         tkTilde, // ~
         tkAt, // @
         tkIdentifier,
+        tkKeyword,
         tkNumber,
         tkString,
         tkEOF,
@@ -82,6 +86,7 @@ type
         procedure Consume(AExpectedKind: TTokenKind);
         procedure NextToken;
         function ParseList: IAstNode;
+        function ParseRecordLiteral: IAstNode;
         function ParseParameterList: TArray<IIdentifierNode>;
         function ParseExpression: TExpr;
     public
@@ -108,6 +113,7 @@ type
         function Execute(const RootNode: IAstNode): TDataValue;
         function VisitConstant(const Node: IConstantNode): TDataValue; override;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
@@ -124,6 +130,7 @@ type
         function VisitAssignment(const Node: IAssignmentNode): TDataValue; override;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
@@ -158,7 +165,7 @@ var
 begin
     startPos := FCurrentPos;
     // Reader macro characters are now also delimiters for identifiers.
-    while (Peek <> #0) and (not (Peek.IsWhiteSpace or CharInSet(Peek, ['(', ')', '[', ']', '''', '`', '~']))) do
+    while (Peek <> #0) and (not (Peek.IsWhiteSpace or CharInSet(Peek, ['(', ')', '[', ']', '{', '}', '''', '`', '~']))) do
         Advance;
     Result := Copy(FSource, startPos, FCurrentPos - startPos);
 end;
@@ -237,6 +244,16 @@ begin
             Result.Kind := tkRightBracket;
             Advance;
         end;
+        '{':
+        begin
+            Result.Kind := tkLeftBrace;
+            Advance;
+        end;
+        '}':
+        begin
+            Result.Kind := tkRightBrace;
+            Advance;
+        end;
         '''':
         begin
             Result.Kind := tkQuote;
@@ -262,6 +279,14 @@ begin
             Result.Kind := tkString;
             Result.Text := ReadString;
         end;
+        ':':
+        begin
+            Advance; // Skip :
+            Result.Kind := tkKeyword;
+            Result.Text := ReadIdentifier;
+            if Result.Text.IsEmpty then
+                Result.Kind := tkError;
+        end;
     else
         if c.IsDigit or ((c = '-') and (FCurrentPos < Length(FSource)) and FSource[FCurrentPos + 1].IsDigit) then
         begin
@@ -326,6 +351,41 @@ begin
     Consume(tkRightBracket);
 end;
 
+function TParser.ParseRecordLiteral: IAstNode;
+var
+    fields: TList<TRecordFieldLiteral>;
+    fieldName: string;
+    fieldValue: IAstNode;
+begin
+    Consume(tkLeftBrace);
+    fields := TList<TRecordFieldLiteral>.Create;
+    try
+        while FCurrentToken.Kind <> tkRightBrace do
+        begin
+            if FCurrentToken.Kind = tkEOF then
+                raise Exception.Create('Syntax Error: Unexpected end of file in record literal.');
+
+            // Key must be a keyword
+            if FCurrentToken.Kind <> tkKeyword then
+                raise Exception.Create('Syntax Error: Expected keyword (e.g., :key) as field name in record literal.');
+            fieldName := FCurrentToken.Text;
+            NextToken;
+
+            // Value can be any expression
+            if FCurrentToken.Kind = tkRightBrace then
+                raise Exception.Create('Syntax Error: Missing value for key ' + fieldName + ' in record literal.');
+            fieldValue := ParseExpression.Node;
+
+            fields.Add(TRecordFieldLiteral.Create(fieldName, fieldValue));
+        end;
+
+        Result := TAst.RecordLiteral(fields.ToArray);
+    finally
+        fields.Free;
+    end;
+    Consume(tkRightBrace);
+end;
+
 function TParser.ParseList: IAstNode;
 
 var
@@ -504,6 +564,11 @@ begin
             Result.Node := TAst.Constant(FCurrentToken.Text);
             NextToken;
         end;
+        tkKeyword:
+        begin
+            Result.Node := TAst.Keyword(FCurrentToken.Text);
+            NextToken;
+        end;
         tkIdentifier:
         begin
             Result.Node := TAst.Identifier(FCurrentToken.Text);
@@ -511,6 +576,7 @@ begin
         end;
         tkLeftParen: Result.Node := ParseList;
         tkLeftBracket: Result.Params := ParseParameterList;
+        tkLeftBrace: Result.Node := ParseRecordLiteral;
         tkEOF: {nop};
     else
         raise Exception.CreateFmt('Syntax Error: Unexpected token %s', [FCurrentToken.Kind.ToString]);
@@ -590,6 +656,12 @@ begin
     Result := TDataValue.Void;
 end;
 
+function TPrettyPrintVisitor.VisitKeyword(const Node: IKeywordNode): TDataValue;
+begin
+    Append(':' + Node.Value.Name);
+    Result := TDataValue.Void;
+end;
+
 function TPrettyPrintVisitor.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
 begin
     Append('(' + Node.Operator.ToString);
@@ -829,6 +901,31 @@ begin
     Result := TDataValue.Void;
 end;
 
+function TPrettyPrintVisitor.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+var
+    field: TRecordFieldLiteral;
+begin
+    if Length(Node.Fields) = 0 then
+    begin
+        Append('{}');
+        exit(TDataValue.Void);
+    end;
+
+    Append('{');
+    Indent;
+    for field in Node.Fields do
+    begin
+        NewLine;
+        Append(':' + field.Name);
+        Append(' ');
+        field.Value.Accept(Self);
+    end;
+    Unindent;
+    NewLine;
+    Append('}');
+    Result := TDataValue.Void;
+end;
+
 function TPrettyPrintVisitor.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
 begin
     Append(Format('(new-series "%s")', [Node.Definition]));
@@ -896,10 +993,14 @@ begin
         tkRightParen: Result := ')';
         tkLeftBracket: Result := '[';
         tkRightBracket: Result := ']';
+        tkLeftBrace: Result := '{';
+        tkRightBrace: Result := '}';
         tkQuote: Result := '''';
         tkBacktick: Result := '`';
         tkTilde: Result := '~';
+        tkAt: Result := '@';
         tkIdentifier: Result := '<identifier>';
+        tkKeyword: Result := '<keyword>';
         tkNumber: Result := '<number>';
         tkString: Result := '<string>';
         tkEOF: Result := '<EOF>';

Src/AST/Myc.Ast.Types.pas

@@ -5,7 +5,8 @@ interface
 uses
     System.SysUtils,
     System.Generics.Collections,
-    Myc.Data.Scalar;
+    Myc.Data.Scalar,
+    Myc.Data.Keyword;
 
 type
     IStaticType = interface;
@@ -17,6 +18,7 @@ type
         stOrdinal, // Int64
         stFloat, // Double
         stText,
+        stKeyword,
         stMethod,
         stSeries,
         stRecord,
@@ -77,6 +79,8 @@ type
             FFloat: IStaticType;
         class var
             FText: IStaticType;
+        class var
+            FKeyword: IStaticType;
         class constructor Create;
     public
         // Flyweight accessors for simple types
@@ -85,6 +89,7 @@ type
         class property Ordinal: IStaticType read FOrdinal;
         class property Float: IStaticType read FFloat;
         class property Text: IStaticType read FText;
+        class property Keyword: IStaticType read FKeyword;
 
         // Factory functions for complex types
         class function CreateSeries(const AElementType: IStaticType): IStaticType; static;
@@ -124,6 +129,7 @@ begin
         stOrdinal: Result := 'Ordinal';
         stFloat: Result := 'Float';
         stText: Result := 'Text';
+        stKeyword: Result := 'Keyword';
         stMethod: Result := 'Method';
         stSeries: Result := 'Series';
         stRecord: Result := 'Record';
@@ -411,6 +417,7 @@ begin
     FOrdinal := TSimpleStaticType.Create(stOrdinal);
     FFloat := TSimpleStaticType.Create(stFloat);
     FText := TSimpleStaticType.Create(stText);
+    FKeyword := TSimpleStaticType.Create(stKeyword);
 end;
 
 class function TTypes.CreateMethod(const AParamTypes: TArray<IStaticType>; const AReturnType: IStaticType): IStaticType;
@@ -541,12 +548,24 @@ begin
             Result := TTypes.Float;
         end;
 
-        TScalar.TBinaryOp.Equal,
+        TScalar.TBinaryOp.Equal, TScalar.TBinaryOp.NotEqual:
-        TScalar.TBinaryOp.NotEqual,
+        begin
-        TScalar.TBinaryOp.Less,
+            // Allow equality checks for Keywords
-        TScalar.TBinaryOp.Greater,
+            if (promotedKind = stKeyword) then
-        TScalar.TBinaryOp.LessOrEqual,
+            begin
-        TScalar.TBinaryOp.GreaterOrEqual:
+                Result := TTypes.Ordinal;
+                exit;
+            end;
+
+            // Comparison requires Ordinal or Float, but *always* results in Ordinal (boolean)
+            if not (promotedKind in [stOrdinal, stFloat]) then
+                raise ETypeException.CreateFmt(
+                    'Comparison operator %s requires Ordinal, Float, or Keyword, but got %s after promotion',
+                    [Op.ToString, promotedType.ToString]);
+            Result := TTypes.Ordinal;
+        end;
+
+        TScalar.TBinaryOp.Less, TScalar.TBinaryOp.Greater, TScalar.TBinaryOp.LessOrEqual, TScalar.TBinaryOp.GreaterOrEqual:
         begin
             // Comparison requires Ordinal or Float, but *always* results in Ordinal (boolean)
             if not (promotedKind in [stOrdinal, stFloat]) then

Src/AST/Myc.Ast.Visitor.pas

@@ -15,6 +15,7 @@ type
     protected
         function VisitConstant(const Node: IConstantNode): TDataValue; virtual; abstract;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; virtual; abstract;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; virtual; abstract;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; virtual; abstract;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; virtual; abstract;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; virtual; abstract;
@@ -31,6 +32,7 @@ type
         function VisitUnquoteSplicing(const Node: IUnquoteSplicingNode): TDataValue; virtual; abstract;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; virtual; abstract;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; virtual; abstract;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; virtual; abstract;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; virtual; abstract;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; virtual; abstract;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; virtual; abstract;
@@ -51,6 +53,7 @@ type
         // These virtual methods implement the default identity-transformation (cloning) behavior.
         function VisitConstant(const Node: IConstantNode): TDataValue; override;
         function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
+        function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
         function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
         function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
         function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
@@ -67,6 +70,7 @@ type
         function VisitUnquoteSplicing(const Node: IUnquoteSplicingNode): TDataValue; override;
         function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
@@ -126,6 +130,12 @@ begin
     Result := TDataValue.FromIntf<IIdentifierNode>(Node);
 end;
 
+function TAstTransformer.VisitKeyword(const Node: IKeywordNode): TDataValue;
+begin
+    // Keywords are interned and immutable
+    Result := TDataValue.FromIntf<IKeywordNode>(Node);
+end;
+
 function TAstTransformer.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
 begin
     var left := Accept(Node.Left).AsIntf<IAstNode>;
@@ -316,6 +326,30 @@ begin
         Result := TDataValue.FromIntf<IMemberAccessNode>(TAst.MemberAccess(base, member));
 end;
 
+function TAstTransformer.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
+var
+    i: Integer;
+    hasChanged: Boolean;
+    newFields: TArray<TRecordFieldLiteral>;
+    newValue: IAstNode;
+begin
+    hasChanged := False;
+    SetLength(newFields, Length(Node.Fields));
+
+    for i := 0 to High(Node.Fields) do
+    begin
+        newValue := Accept(Node.Fields[i].Value).AsIntf<IAstNode>;
+        if newValue <> Node.Fields[i].Value then
+            hasChanged := True;
+        newFields[i] := TRecordFieldLiteral.Create(Node.Fields[i].Name, newValue);
+    end;
+
+    if hasChanged then
+        Result := TDataValue.FromIntf<IRecordLiteralNode>(TAst.RecordLiteral(newFields))
+    else
+        Result := TDataValue.FromIntf<IRecordLiteralNode>(Node);
+end;
+
 function TAstTransformer.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
 begin
     Result := TDataValue.FromIntf<ICreateSeriesNode>(Node);

Src/AST/Myc.Ast.pas

@@ -9,6 +9,7 @@ uses
     System.Generics.Defaults,
     Myc.Data.Scalar,
     Myc.Data.Value,
+    Myc.Data.Keyword,
     Myc.Ast.Nodes,
     Myc.Ast.Types,
     Myc.Ast.Scope;
@@ -31,6 +32,7 @@ type
         // --- Factory functions ---
         class function Constant(const AValue: TDataValue): IConstantNode; overload; static;
         class function Constant(const AValue: String): IConstantNode; overload; static;
+        class function Keyword(const AName: string): IKeywordNode; static;
         class function Identifier(AName: string): IIdentifierNode; static;
         class function BinaryExpr(ALeft: IAstNode; AOperator: TScalar.TBinaryOp; ARight: IAstNode): IBinaryExpressionNode; static;
         class function UnaryExpr(const AOperator: TScalar.TUnaryOp; const ARight: IAstNode): IUnaryExpressionNode; static;
@@ -57,6 +59,7 @@ type
         class function AssignResult(const AValue: IAstNode): IAssignmentNode; static; deprecated;
         class function Indexer(const ABase: IAstNode; const AIndex: IAstNode): IIndexerNode; static;
         class function MemberAccess(const ABase: IAstNode; const AMember: IIdentifierNode): IMemberAccessNode; static;
+        class function RecordLiteral(const AFields: TArray<TRecordFieldLiteral>): IRecordLiteralNode; static;
         class function CreateSeries(const ADefinition: String): ICreateSeriesNode; static;
         class function AddSeriesItem(
             const ASeries: IIdentifierNode;
@@ -96,6 +99,16 @@ type
         property Name: string read FName;
     end;
 
+    TKeywordNode = class(TAstNode, IKeywordNode)
+    private
+        FValue: IKeyword;
+        function GetValue: IKeyword;
+    public
+        constructor Create(const AName: string);
+        function Accept(const Visitor: IAstVisitor): TDataValue; override;
+        property Value: IKeyword read FValue;
+    end;
+
     TBinaryExpressionNode = class(TAstNode, IBinaryExpressionNode)
     private
         FLeft: IAstNode;
@@ -287,6 +300,16 @@ type
         function Accept(const Visitor: IAstVisitor): TDataValue; override;
     end;
 
+    TRecordLiteralNode = class(TAstNode, IRecordLiteralNode)
+    private
+        FFields: TArray<TRecordFieldLiteral>;
+        function GetFields: TArray<TRecordFieldLiteral>;
+    public
+        constructor Create(const AFields: TArray<TRecordFieldLiteral>);
+        function Accept(const Visitor: IAstVisitor): TDataValue; override;
+        property Fields: TArray<TRecordFieldLiteral> read FFields;
+    end;
+
     TCreateSeriesNode = class(TAstNode, ICreateSeriesNode)
     private
         FDefinition: String;
@@ -367,6 +390,25 @@ begin
     Result := FName;
 end;
 
+{ TKeywordNode }
+
+constructor TKeywordNode.Create(const AName: string);
+begin
+    inherited Create;
+    FValue := TKeywordRegistry.Intern(AName);
+    StaticType := TTypes.Keyword;
+end;
+
+function TKeywordNode.Accept(const Visitor: IAstVisitor): TDataValue;
+begin
+    Result := Visitor.VisitKeyword(Self);
+end;
+
+function TKeywordNode.GetValue: IKeyword;
+begin
+    Result := FValue;
+end;
+
 { TBinaryExpressionNode }
 
 constructor TBinaryExpressionNode.Create(const ALeft: IAstNode; AOperator: TScalar.TBinaryOp; const ARight: IAstNode);
@@ -768,6 +810,24 @@ begin
     Result := FMember;
 end;
 
+{ TRecordLiteralNode }
+
+constructor TRecordLiteralNode.Create(const AFields: TArray<TRecordFieldLiteral>);
+begin
+    inherited Create;
+    FFields := AFields;
+end;
+
+function TRecordLiteralNode.Accept(const Visitor: IAstVisitor): TDataValue;
+begin
+    Result := Visitor.VisitRecordLiteral(Self);
+end;
+
+function TRecordLiteralNode.GetFields: TArray<TRecordFieldLiteral>;
+begin
+    Result := FFields;
+end;
+
 { TCreateSeriesNode }
 
 constructor TCreateSeriesNode.Create(const ADefinition: String);
@@ -930,6 +990,11 @@ begin
     Result := TIndexerNode.Create(ABase, AIndex);
 end;
 
+class function TAst.Keyword(const AName: string): IKeywordNode;
+begin
+    Result := TKeywordNode.Create(AName);
+end;
+
 class function TAst.LambdaExpr(const AParameters: TArray<IIdentifierNode>; const ABody: IAstNode): ILambdaExpressionNode;
 begin
     Result := TLambdaExpressionNode.Create(AParameters, ABody);
@@ -965,6 +1030,11 @@ begin
     Result := TRecurNode.Create(args);
 end;
 
+class function TAst.RecordLiteral(const AFields: TArray<TRecordFieldLiteral>): IRecordLiteralNode;
+begin
+    Result := TRecordLiteralNode.Create(AFields);
+end;
+
 class function TAst.SeriesLength(const ASeries: IIdentifierNode): ISeriesLengthNode;
 begin
     Result := TSeriesLengthNode.Create(ASeries);