Ast editor rondtrip

ASTPlayground/ASTPlayground.dpr

@@ -29,7 +29,8 @@ uses
     Myc.Fmx.AstEditor.Core in '..\Src\AST\Myc.Fmx.AstEditor.Core.pas',
     Myc.Fmx.AstEditor.Handlers in '..\Src\AST\Myc.Fmx.AstEditor.Handlers.pas',
     Myc.Fmx.AstEditor.Visualizer in '..\Src\AST\Myc.Fmx.AstEditor.Visualizer.pas',
-    Myc.Fmx.AstEditor.Workspace in '..\Src\AST\Myc.Fmx.AstEditor.Workspace.pas';
+    Myc.Fmx.AstEditor.Workspace in '..\Src\AST\Myc.Fmx.AstEditor.Workspace.pas',
+    Myc.Fmx.AstEditor.Controller in '..\Src\AST\Myc.Fmx.AstEditor.Controller.pas';
 
 {$R *.res}
 

ASTPlayground/ASTPlayground.dproj

@@ -160,6 +160,7 @@
         <DCCReference Include="..\Src\AST\Myc.Fmx.AstEditor.Handlers.pas"/>
         <DCCReference Include="..\Src\AST\Myc.Fmx.AstEditor.Visualizer.pas"/>
         <DCCReference Include="..\Src\AST\Myc.Fmx.AstEditor.Workspace.pas"/>
+        <DCCReference Include="..\Src\AST\Myc.Fmx.AstEditor.Controller.pas"/>
         <BuildConfiguration Include="Base">
             <Key>Base</Key>
         </BuildConfiguration>

Src/AST/Myc.Ast.Compiler.Binder.pas

@@ -143,12 +143,8 @@ class function TAstBinder.Bind(
     const AArgTypes: TArray<IStaticType> = nil
 ): IAstNode;
 begin
-    var binder := TAstBinder.Create(ParentLayout, AFunctionRegistry, AArgTypes, ALog);
-    try
-        Result := binder.Execute(RootNode, Layout);
-    finally
-        binder.Free;
-    end;
+    var binder := TAstBinder.Create(ParentLayout, AFunctionRegistry, AArgTypes, ALog) as IAstBinder;
+    Result := binder.Execute(RootNode, Layout);
 end;
 
 function TAstBinder.Execute(const RootNode: IAstNode; out Layout: IScopeLayout): IAstNode;

Src/AST/Myc.Ast.Compiler.Specializer.pas

@@ -38,14 +38,6 @@ type
         procedure Add(const Key: TMonoCacheKey; const Func: TSpecializedMethod);
     end;
 
-    TCompiledFunction = record
-    public
-        Func: TDataValue.TFunc;
-        StaticType: IStaticType;
-        IsPure: Boolean;
-        constructor Create(const AFunc: TDataValue.TFunc; const AStaticType: IStaticType; AIsPure: Boolean);
-    end;
-
     // This transformer runs *after* TypeChecker.
     // It specializes all statically resolvable function calls (RTL and user-defined)
     // by replacing them with nodes that have a direct StaticTarget.
@@ -271,13 +263,4 @@ begin
     ArgTypes := AArgTypes;
 end;
 
-{ TCompiledFunction }
-
-constructor TCompiledFunction.Create(const AFunc: TDataValue.TFunc; const AStaticType: IStaticType; AIsPure: Boolean);
-begin
-    Func := AFunc;
-    StaticType := AStaticType;
-    IsPure := AIsPure;
-end;
-
 end.

Src/AST/Myc.Ast.Environment.pas

@@ -50,7 +50,12 @@ type
 
         function Specialize(const Node: IAstNode): IAstNode;
 
-        function Compile(const Node: IFunctionDefinition; const ArgTypes: TArray<IStaticType> = []): TCompiledFunction;
+        function Compile(
+            const Node: IFunctionDefinition;
+            const ArgTypes: TArray<IStaticType> = [];
+            const Log: ICompilerLog = nil
+        ): TCompiledFunction;
+        function Link(const Node: ILambdaExpressionNode; const Log: ICompilerLog): TCompiledFunction;
 
         function CreateEnvironment: IEnvironment;
 
@@ -80,15 +85,19 @@ type
         procedure SetStandardMode;
         procedure SetDebugMode(ALog: TStrings; AShowScope: Boolean);
 
-        function Run(const ANode: IAstNode; const Params: TArray<IIdentifierNode> = []; const Args: TArray<TDataValue> = []): TDataValue;
+        function ExpandMacros(const Node: IAstNode): IAstNode;
+        function Bind(const Node: IAstNode; const AArgTypes: TArray<IStaticType>; const Log: ICompilerLog): IAstNode;
+        function Specialize(const Node: IAstNode): IAstNode;
 
         function Compile(
             const Node: IAstNode;
             const Params: TArray<IIdentifierNode> = [];
             const ArgTypes: TArray<IStaticType> = []
         ): TCompiledFunction; overload;
-
         function Compile(const Node: IFunctionDefinition; const ArgTypes: TArray<IStaticType> = []): TCompiledFunction; overload;
+        function Link(const Node: ILambdaExpressionNode; const Log: ICompilerLog): TCompiledFunction;
+
+        function Run(const ANode: IAstNode; const Params: TArray<IIdentifierNode> = []; const Args: TArray<TDataValue> = []): TDataValue;
 
         procedure Define(const Name: String; const AScript: IAstNode);
 
@@ -180,7 +189,12 @@ type
 
         function Specialize(const Node: IAstNode): IAstNode;
 
-        function Compile(const Node: IFunctionDefinition; const ArgTypes: TArray<IStaticType>): TCompiledFunction; overload;
+        function Compile(
+            const Node: IFunctionDefinition;
+            const ArgTypes: TArray<IStaticType>;
+            const Log: ICompilerLog = nil
+        ): TCompiledFunction;
+        function Link(const Node: ILambdaExpressionNode; const Log: ICompilerLog): TCompiledFunction;
     end;
 
 { TAstEnvironment }
@@ -190,6 +204,13 @@ begin
     FEnvironment := AEnvironment;
 end;
 
+function TAstEnvironment.Bind(const Node: IAstNode; const AArgTypes: TArray<IStaticType>; const Log: ICompilerLog): IAstNode;
+var
+    layout: IScopeLayout;
+begin
+    Result := FEnvironment.Bind(Node, layout, AArgTypes, Log);
+end;
+
 procedure TAstEnvironment.SetStandardMode;
 begin
     FEnvironment.SetExecutionStrategy(TStandardExecutionStrategy.Create);
@@ -245,6 +266,11 @@ begin
     RootScope.Define(Name, compiled.Func([]), compiled.StaticType);
 end;
 
+function TAstEnvironment.ExpandMacros(const Node: IAstNode): IAstNode;
+begin
+    Result := FEnvironment.ExpandMacros(Node);
+end;
+
 function TAstEnvironment.GetRootScope: IExecutionScope;
 begin
     Result := FEnvironment.GetRootScope;
@@ -255,14 +281,23 @@ begin
     Result := FEnvironment.GetMacroRegistry;
 end;
 
+function TAstEnvironment.Link(const Node: ILambdaExpressionNode; const Log: ICompilerLog): TCompiledFunction;
+begin
+    Result := FEnvironment.Link(Node, Log);
+end;
+
 function TAstEnvironment.Run(
     const ANode: IAstNode;
     const Params: TArray<IIdentifierNode> = [];
     const Args: TArray<TDataValue> = []
 ): TDataValue;
 begin
-    var compiled := Compile(ANode, Params);
-    Result := compiled.Func(Args);
+    Result := Compile(ANode, Params).Func(Args);
+end;
+
+function TAstEnvironment.Specialize(const Node: IAstNode): IAstNode;
+begin
+    Result := FEnvironment.Specialize(Node);
 end;
 
 { TStandardExecutionStrategy }
@@ -365,45 +400,55 @@ begin
     Result := TEnvironment.Create(TAst.CreateScope(FRootScope), TMacroRegistry.Create(FMacroRegistry), FExecutionStrategy);
 end;
 
-function TEnvironment.Compile(const Node: IFunctionDefinition; const ArgTypes: TArray<IStaticType>): TCompiledFunction;
+function TEnvironment.Compile(
+    const Node: IFunctionDefinition;
+    const ArgTypes: TArray<IStaticType>;
+    const Log: ICompilerLog = nil
+): TCompiledFunction;
 var
     layout: IScopeLayout;
-    descriptor: IScopeDescriptor;
-    funcType: IStaticType;
-    finalFunc: TDataValue.TFunc;
-
-    typedNode, specialized, tcoOptimized: IAstNode;
-    isPure: Boolean;
-
-    log: ICompilerLog;
+    lg: ICompilerLog;
 begin
-    log := TCompilerLog.Create;
+    lg :=
+        if Assigned(Log) then Log
+        else TCompilerLog.Create as ICompilerLog;
 
     // 1. Expand Macros
     var expanded := ExpandMacros(Node);
 
     // 2. Bind & TypeCheck (accumulating errors)
-    typedNode := Bind(expanded, layout, ArgTypes, log);
+    var typedNode := Bind(expanded, layout, ArgTypes, lg);
 
     // 3. Check for compilation errors
-    if log.HasErrors then
-        raise ECompilationFailed.Create(log.GetEntries);
+    if lg.HasErrors then
+        raise ECompilationFailed.Create(lg.GetEntries);
 
     // Note: If types are Unknown but no errors were logged (edge case), we proceed.
     // But Binder/TypeChecker logic ensures errors are logged for Unknowns that matter.
 
-    // 4. Specialization & Optimization
-    descriptor := typedNode.AsLambdaExpression.Descriptor;
+    var specialized := Specialize(typedNode);
+
+    Result := Link(specialized.AsLambdaExpression, lg);
+end;
+
+function TEnvironment.Link(const Node: ILambdaExpressionNode; const Log: ICompilerLog): TCompiledFunction;
+var
+    descriptor: IScopeDescriptor;
+    funcType: IStaticType;
+    finalFunc: TDataValue.TFunc;
+    isPure: Boolean;
+begin
+    descriptor := Node.Descriptor;
+
     // Descriptor might be nil if Bind failed badly, but HasErrors check above covers that.
     Assert(Assigned(descriptor));
 
-    funcType := typedNode.AsTypedNode.StaticType;
+    funcType := Node.StaticType;
 
-    specialized := Specialize(typedNode);
-    tcoOptimized := TAstTCO.Optimize(specialized);
+    var tcoOptimized := TAstTCO.Optimize(Node).AsLambdaExpression;
 
     // 5. Purity Inference
-    isPure := TPurityAnalyzer.IsPure(tcoOptimized.AsLambdaExpression.Body);
+    isPure := TPurityAnalyzer.IsPure(tcoOptimized.Body);
 
     // 6. Generate Visitor/Closure
     var visitor := FExecutionStrategy.CreateVisitor(descriptor.CreateScope(FRootScope));

Src/AST/Myc.Ast.Nodes.pas

@@ -64,6 +64,14 @@ type
         property Errors: TArray<TCompilerError> read FErrors;
     end;
 
+    TCompiledFunction = record
+    public
+        Func: TDataValue.TFunc;
+        StaticType: IStaticType;
+        IsPure: Boolean;
+        constructor Create(const AFunc: TDataValue.TFunc; const AStaticType: IStaticType; AIsPure: Boolean);
+    end;
+
     // --- AST Interfaces ---
 
     IAstVisitor = interface;
@@ -839,6 +847,15 @@ uses
     System.Rtti,
     System.StrUtils;
 
+{ TCompiledFunction }
+
+constructor TCompiledFunction.Create(const AFunc: TDataValue.TFunc; const AStaticType: IStaticType; AIsPure: Boolean);
+begin
+    Func := AFunc;
+    StaticType := AStaticType;
+    IsPure := AIsPure;
+end;
+
 { TAstNodeKindHelper }
 
 function TAstNodeKindHelper.ToString: string;

Src/AST/Myc.Ast.Visitor.pas

@@ -123,7 +123,7 @@ type
         function VisitNop(const Node: INopNode): IAstNode; override;
     end;
 
-    TAstVisitor = class abstract(TInterfacedObject, IAstVisitor)
+    TAstVisitor = class(TInterfacedObject, IAstVisitor)
     strict private
         // IAstVisitor explicit implementation (bridge methods)
         function IAstVisitor.VisitConstant = DoVisitConstant;
@@ -176,30 +176,33 @@ type
         function DoVisitNop(const Node: INopNode): TDataValue;
 
     protected
-        // Virtual procedures for descendants (Interpreters/Side-effects) to override
-        procedure VisitConstant(const Node: IConstantNode); virtual; abstract;
-        procedure VisitIdentifier(const Node: IIdentifierNode); virtual; abstract;
-        procedure VisitKeyword(const Node: IKeywordNode); virtual; abstract;
-        procedure VisitIfExpression(const Node: IIfExpressionNode); virtual; abstract;
-        procedure VisitTernaryExpression(const Node: ITernaryExpressionNode); virtual; abstract;
-        procedure VisitLambdaExpression(const Node: ILambdaExpressionNode); virtual; abstract;
-        procedure VisitFunctionCall(const Node: IFunctionCallNode); virtual; abstract;
-        procedure VisitMacroExpansionNode(const Node: IMacroExpansionNode); virtual; abstract;
-        procedure VisitBlockExpression(const Node: IBlockExpressionNode); virtual; abstract;
-        procedure VisitVariableDeclaration(const Node: IVariableDeclarationNode); virtual; abstract;
-        procedure VisitAssignment(const Node: IAssignmentNode); virtual; abstract;
-        procedure VisitMacroDefinition(const Node: IMacroDefinitionNode); virtual; abstract;
-        procedure VisitQuasiquote(const Node: IQuasiquoteNode); virtual; abstract;
-        procedure VisitUnquote(const Node: IUnquoteNode); virtual; abstract;
-        procedure VisitUnquoteSplicing(const Node: IUnquoteSplicingNode); virtual; abstract;
-        procedure VisitIndexer(const Node: IIndexerNode); virtual; abstract;
-        procedure VisitMemberAccess(const Node: IMemberAccessNode); virtual; abstract;
-        procedure VisitRecordLiteral(const Node: IRecordLiteralNode); virtual; abstract;
-        procedure VisitCreateSeries(const Node: ICreateSeriesNode); virtual; abstract;
-        procedure VisitAddSeriesItem(const Node: IAddSeriesItemNode); virtual; abstract;
-        procedure VisitSeriesLength(const Node: ISeriesLengthNode); virtual; abstract;
-        procedure VisitRecurNode(const Node: IRecurNode); virtual; abstract;
-        procedure VisitNop(const Node: INopNode); virtual; abstract;
+        // Entry point for traversal
+        procedure Accept(const Node: IAstNode); virtual;
+
+        // Virtual procedures with default traversal implementation
+        procedure VisitConstant(const Node: IConstantNode); virtual;
+        procedure VisitIdentifier(const Node: IIdentifierNode); virtual;
+        procedure VisitKeyword(const Node: IKeywordNode); virtual;
+        procedure VisitIfExpression(const Node: IIfExpressionNode); virtual;
+        procedure VisitTernaryExpression(const Node: ITernaryExpressionNode); virtual;
+        procedure VisitLambdaExpression(const Node: ILambdaExpressionNode); virtual;
+        procedure VisitFunctionCall(const Node: IFunctionCallNode); virtual;
+        procedure VisitMacroExpansionNode(const Node: IMacroExpansionNode); virtual;
+        procedure VisitBlockExpression(const Node: IBlockExpressionNode); virtual;
+        procedure VisitVariableDeclaration(const Node: IVariableDeclarationNode); virtual;
+        procedure VisitAssignment(const Node: IAssignmentNode); virtual;
+        procedure VisitMacroDefinition(const Node: IMacroDefinitionNode); virtual;
+        procedure VisitQuasiquote(const Node: IQuasiquoteNode); virtual;
+        procedure VisitUnquote(const Node: IUnquoteNode); virtual;
+        procedure VisitUnquoteSplicing(const Node: IUnquoteSplicingNode); virtual;
+        procedure VisitIndexer(const Node: IIndexerNode); virtual;
+        procedure VisitMemberAccess(const Node: IMemberAccessNode); virtual;
+        procedure VisitRecordLiteral(const Node: IRecordLiteralNode); virtual;
+        procedure VisitCreateSeries(const Node: ICreateSeriesNode); virtual;
+        procedure VisitAddSeriesItem(const Node: IAddSeriesItemNode); virtual;
+        procedure VisitSeriesLength(const Node: ISeriesLengthNode); virtual;
+        procedure VisitRecurNode(const Node: IRecurNode); virtual;
+        procedure VisitNop(const Node: INopNode); virtual;
     end;
 
 implementation
@@ -706,6 +709,153 @@ end;
 
 { TAstVisitor }
 
+procedure TAstVisitor.Accept(const Node: IAstNode);
+begin
+    if Assigned(Node) then
+        Node.Accept(Self);
+end;
+
+procedure TAstVisitor.VisitConstant(const Node: IConstantNode);
+begin
+    // Leaf node
+end;
+
+procedure TAstVisitor.VisitIdentifier(const Node: IIdentifierNode);
+begin
+    // Leaf node
+end;
+
+procedure TAstVisitor.VisitKeyword(const Node: IKeywordNode);
+begin
+    // Leaf node
+end;
+
+procedure TAstVisitor.VisitIfExpression(const Node: IIfExpressionNode);
+begin
+    Accept(Node.Condition);
+    Accept(Node.ThenBranch);
+    Accept(Node.ElseBranch);
+end;
+
+procedure TAstVisitor.VisitTernaryExpression(const Node: ITernaryExpressionNode);
+begin
+    Accept(Node.Condition);
+    Accept(Node.ThenBranch);
+    Accept(Node.ElseBranch);
+end;
+
+procedure TAstVisitor.VisitLambdaExpression(const Node: ILambdaExpressionNode);
+begin
+    for var param in Node.Parameters do
+        Accept(param);
+    Accept(Node.Body);
+end;
+
+procedure TAstVisitor.VisitFunctionCall(const Node: IFunctionCallNode);
+begin
+    Accept(Node.Callee);
+    for var arg in Node.Arguments do
+        Accept(arg);
+end;
+
+procedure TAstVisitor.VisitMacroExpansionNode(const Node: IMacroExpansionNode);
+begin
+    Accept(Node.CallNode);
+    Accept(Node.ExpandedBody);
+end;
+
+procedure TAstVisitor.VisitBlockExpression(const Node: IBlockExpressionNode);
+begin
+    for var expr in Node.Expressions do
+        Accept(expr);
+end;
+
+procedure TAstVisitor.VisitVariableDeclaration(const Node: IVariableDeclarationNode);
+begin
+    Accept(Node.Target);
+    Accept(Node.Initializer);
+end;
+
+procedure TAstVisitor.VisitAssignment(const Node: IAssignmentNode);
+begin
+    Accept(Node.Target);
+    Accept(Node.Value);
+end;
+
+procedure TAstVisitor.VisitMacroDefinition(const Node: IMacroDefinitionNode);
+begin
+    Accept(Node.Name);
+    for var param in Node.Parameters do
+        Accept(param);
+    Accept(Node.Body);
+end;
+
+procedure TAstVisitor.VisitQuasiquote(const Node: IQuasiquoteNode);
+begin
+    Accept(Node.Expression);
+end;
+
+procedure TAstVisitor.VisitUnquote(const Node: IUnquoteNode);
+begin
+    Accept(Node.Expression);
+end;
+
+procedure TAstVisitor.VisitUnquoteSplicing(const Node: IUnquoteSplicingNode);
+begin
+    Accept(Node.Expression);
+end;
+
+procedure TAstVisitor.VisitIndexer(const Node: IIndexerNode);
+begin
+    Accept(Node.Base);
+    Accept(Node.Index);
+end;
+
+procedure TAstVisitor.VisitMemberAccess(const Node: IMemberAccessNode);
+begin
+    Accept(Node.Base);
+    Accept(Node.Member);
+end;
+
+procedure TAstVisitor.VisitRecordLiteral(const Node: IRecordLiteralNode);
+begin
+    for var field in Node.Fields do
+    begin
+        Accept(field.Key);
+        Accept(field.Value);
+    end;
+end;
+
+procedure TAstVisitor.VisitCreateSeries(const Node: ICreateSeriesNode);
+begin
+    // Leaf node
+end;
+
+procedure TAstVisitor.VisitAddSeriesItem(const Node: IAddSeriesItemNode);
+begin
+    Accept(Node.Series);
+    Accept(Node.Value);
+    Accept(Node.Lookback);
+end;
+
+procedure TAstVisitor.VisitSeriesLength(const Node: ISeriesLengthNode);
+begin
+    Accept(Node.Series);
+end;
+
+procedure TAstVisitor.VisitRecurNode(const Node: IRecurNode);
+begin
+    for var arg in Node.Arguments do
+        Accept(arg);
+end;
+
+procedure TAstVisitor.VisitNop(const Node: INopNode);
+begin
+    // Leaf node
+end;
+
+// ... [Private Bridge Methods implementation remains unchanged] ...
+
 function TAstVisitor.DoVisitConstant(const Node: IConstantNode): TDataValue;
 begin
     VisitConstant(Node);
@@ -818,7 +968,6 @@ end;
 
 function TAstVisitor.DoVisitNop(const Node: INopNode): TDataValue;
 begin
-    // Added Nop implementation
     VisitNop(Node);
 end;
 

Src/AST/Myc.Fmx.AstEditor.Controller.pas

@@ -0,0 +1,258 @@
+unit Myc.Fmx.AstEditor.Controller;
+
+interface
+
+uses
+    System.SysUtils,
+    System.Classes,
+    System.Types,
+    System.Generics.Collections,
+    FMX.Controls,
+    Myc.Ast,
+    Myc.Ast.Nodes,
+    Myc.Ast.Identities,
+    Myc.Ast.Types,
+    Myc.Ast.Visitor,
+    Myc.Ast.Scope,
+    Myc.Ast.Environment,
+    Myc.Fmx.AstEditor.Core,
+    Myc.Fmx.AstEditor.Workspace;
+
+type
+    TAstEditorController = class
+    private
+        type
+            TNodeMap = TDictionary<IAstIdentity, TAstViewNode>;
+
+            // Visitor to propagate Type Information from TypedAST to Visual Nodes
+            TTypePropagator = class(TAstVisitor)
+            private
+                FMap: TNodeMap;
+                procedure ApplyType(const Node: IAstNode);
+            protected
+                // Central hook: Called for every node during traversal
+                procedure Accept(const Node: IAstNode); override;
+            public
+                constructor Create(AMap: TNodeMap);
+            end;
+
+    private
+        FEnv: TAstEnvironment;
+        FWorkspace: TAstWorkspace;
+        FNodeMap: TNodeMap;
+        FRootViewNode: TAstViewNode;
+
+        procedure CollectNodes(Parent: TControl);
+        procedure ClearVisuals;
+        procedure ApplyErrors(const Log: ICompilerLog);
+        procedure ApplyTypes(const TypedAst: IAstNode);
+
+    public
+        constructor Create(const AEnv: TAstEnvironment; AWorkspace: TAstWorkspace);
+        destructor Destroy; override;
+
+        procedure ValidateAndShow;
+        procedure SetRoot(const AstNode: IAstNode);
+    end;
+
+implementation
+
+uses
+    Myc.Data.Value;
+
+{ TAstEditorController }
+
+constructor TAstEditorController.Create(const AEnv: TAstEnvironment; AWorkspace: TAstWorkspace);
+begin
+    inherited Create;
+    FEnv := AEnv;
+    FWorkspace := AWorkspace;
+    FNodeMap := TNodeMap.Create;
+end;
+
+destructor TAstEditorController.Destroy;
+begin
+    FNodeMap.Free;
+    inherited;
+end;
+
+procedure TAstEditorController.SetRoot(const AstNode: IAstNode);
+begin
+    FWorkspace.DeleteChildren;
+    FWorkspace.Build(AstNode, TPointF.Create(50, 50));
+
+    if FWorkspace.ChildrenCount > 0 then
+    begin
+        for var i := 0 to FWorkspace.ChildrenCount - 1 do
+            if FWorkspace.Children[i] is TAstViewNode then
+            begin
+                FRootViewNode := TAstViewNode(FWorkspace.Children[i]);
+                break;
+            end;
+    end;
+
+    ValidateAndShow;
+end;
+
+procedure TAstEditorController.CollectNodes(Parent: TControl);
+var
+    i: Integer;
+    child: TControl;
+    viewNode: TAstViewNode;
+begin
+    for i := 0 to Parent.ChildrenCount - 1 do
+    begin
+        if Parent.Children[i] is TControl then
+        begin
+            child := TControl(Parent.Children[i]);
+
+            if child is TAstViewNode then
+            begin
+                viewNode := TAstViewNode(child);
+                // Register Identity -> ViewNode
+                // Note: ReconstructAst updates the Node property of the ViewNode,
+                // so we must ensure we use the identity from the *logical* node held by the view.
+                if Assigned(viewNode.Node) and Assigned(viewNode.Node.Identity) then
+                begin
+                    FNodeMap.AddOrSetValue(viewNode.Node.Identity, viewNode);
+                end;
+            end;
+
+            if child.ChildrenCount > 0 then
+                CollectNodes(child);
+        end;
+    end;
+end;
+
+procedure TAstEditorController.ClearVisuals;
+begin
+    for var viewNode in FNodeMap.Values do
+    begin
+        viewNode.ErrorMessage := '';
+        viewNode.TypeInfoText := '';
+    end;
+end;
+
+procedure TAstEditorController.ApplyErrors(const Log: ICompilerLog);
+var
+    entry: TCompilerError;
+    viewNode: TAstViewNode;
+begin
+    for entry in Log.GetEntries do
+    begin
+        if (entry.Level = elError) and Assigned(entry.Node) and Assigned(entry.Node.Identity) then
+        begin
+            if FNodeMap.TryGetValue(entry.Node.Identity, viewNode) then
+            begin
+                if viewNode.ErrorMessage = '' then
+                    viewNode.ErrorMessage := entry.Message
+                else
+                    viewNode.ErrorMessage := viewNode.ErrorMessage + sLineBreak + entry.Message;
+            end;
+        end;
+    end;
+end;
+
+procedure TAstEditorController.ApplyTypes(const TypedAst: IAstNode);
+var
+    propagator: TTypePropagator;
+begin
+    if not Assigned(TypedAst) then
+        Exit;
+
+    propagator := TTypePropagator.Create(FNodeMap);
+    try
+        // Start traversal. The overload Accept(Node) will be called.
+        propagator.Accept(TypedAst);
+    finally
+        propagator.Free;
+    end;
+end;
+
+procedure TAstEditorController.ValidateAndShow;
+var
+    logicalAst: IAstNode;
+begin
+    if not Assigned(FRootViewNode) then
+        Exit;
+
+    // 1. Reconstruct Logical AST from UI
+    // This updates the .Node property on ViewNodes with fresh Identities (if configured) or reuses them.
+    logicalAst := FRootViewNode.CreateAst;
+
+    // 2. Rebuild Mapping based on the new logical nodes
+    FNodeMap.Clear;
+    CollectNodes(FWorkspace);
+
+    // 3. Clear visuals
+    ClearVisuals;
+
+    // 4. Compile
+    try
+        // To get type info, we re-bind/check manually as Compile doesn't return the TypedAST.
+        var log := TCompilerLog.Create as ICompilerLog;
+
+        // We need to expand macros first to match the structure Compile used
+        var expanded := FEnv.ExpandMacros(logicalAst);
+        var typedAst := FEnv.Bind(expanded, [], log);
+
+        var specAst := FEnv.Specialize(typedAst);
+
+        ApplyTypes(specAst);
+
+        if specAst.Kind = akLambdaExpression then
+            var compiled := FEnv.Link(specAst.AsLambdaExpression, log);
+
+        ApplyErrors(log);
+    except
+        on E: ECompilationFailed do
+        begin
+            var tempLog := TCompilerLog.Create as ICompilerLog;
+            for var err in E.Errors do
+                tempLog.Add(err.Level, err.Message, err.Node);
+            ApplyErrors(tempLog);
+        end;
+    end;
+
+    FWorkspace.Repaint;
+end;
+
+{ TAstEditorController.TTypePropagator }
+
+constructor TAstEditorController.TTypePropagator.Create(AMap: TNodeMap);
+begin
+    inherited Create;
+    FMap := AMap;
+end;
+
+procedure TAstEditorController.TTypePropagator.ApplyType(const Node: IAstNode);
+var
+    viewNode: TAstViewNode;
+begin
+    if Assigned(Node) and Assigned(Node.Identity) then
+    begin
+        if FMap.TryGetValue(Node.Identity, viewNode) then
+        begin
+            if Node.IsTyped then
+            begin
+                var st := Node.AsTypedNode.StaticType;
+                if Assigned(st) then
+                    viewNode.TypeInfoText := st.ToString;
+            end;
+        end;
+    end;
+end;
+
+procedure TAstEditorController.TTypePropagator.Accept(const Node: IAstNode);
+begin
+    if Node = nil then
+        Exit;
+
+    // 1. Apply side effect
+    ApplyType(Node);
+
+    // 2. Continue traversal (Standard TAstVisitor logic calls VisitXY which calls Accept for children)
+    Node.Accept(Self);
+end;
+
+end.