Pipes and test scripts

ASTPlayground/MainForm.fmx

@@ -183,6 +183,12 @@ object Form1: TForm1
       TabOrder = 24
       OnChange = RTLListViewChange
     end
+    object SaveTestBtn: TButton
+      Position.X = 24.000000000000000000
+      Position.Y = 479.000000000000000000
+      TabOrder = 26
+      Text = 'Save test'
+    end
   end
   object Panel2: TPanel
     Align = Client

ASTPlayground/MainForm.pas

@@ -44,7 +44,8 @@ uses
     Myc.Ast.RTL,
     Myc.Ast.Compiler.Macros,
     // Editor Units
-    Myc.Fmx.AstEditor;
+    Myc.Fmx.AstEditor,
+    FMX.Menus;
 
 type
     // A test record
@@ -87,6 +88,7 @@ type
         SaveUserLibButton: TButton;
         RTLListView: TListView;
         CompilerStageBox: TComboBox;
+        SaveTestBtn: TButton;
         procedure InnerLambdaButtonClick(Sender: TObject);
         procedure ClearButtonClick(Sender: TObject);
         procedure CompilerStageBoxChange(Sender: TObject);

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

@@ -13,7 +13,7 @@ uses
     Myc.Ast.Scope,
     Myc.Ast.Types,
     Myc.Ast.Compiler.Binder.Upvalues,
-    Myc.Ast.Identities, // Wichtig für AsNamed
+    Myc.Ast.Identities,
     Myc.Ast;
 
 type
@@ -40,7 +40,6 @@ type
         FBoxedDeclarations: THashSet<IVariableDeclarationNode>;
         FLog: ICompilerLog;
 
-        // Counts lambdas encountered to determine if a lambda has nested children
         FLambdaCounter: Integer;
 
         function IsValidIdentifier(const Name: string): Boolean;
@@ -234,7 +233,7 @@ var
     upvalueIndex: Integer;
     identity: INamedIdentity;
 begin
-    identity := Node.Identity.AsNamed; // Type-safe extraction of identity
+    identity := Node.Identity.AsNamed;
 
     if Node.Address.Kind = akUnresolved then
     begin
@@ -249,7 +248,6 @@ begin
         if physAddr.ScopeDepth > 0 then
         begin
             upvalueIndex := CaptureUpvalue(physAddr);
-            // Recreate identifier using the SAME identity but new address
             Result := TAst.Identifier(identity, TResolvedAddress.Create(akUpvalue, 0, upvalueIndex), TTypes.Unknown);
         end
         else
@@ -298,12 +296,8 @@ begin
     else
         newInit := nil;
 
-    // Recreate identifier with bound address using original identity
     newIdent := TAst.Identifier(identIdentity, addr, TTypes.Unknown);
-
     isBoxed := (FBoxedDeclarations <> nil) and FBoxedDeclarations.Contains(Node);
-
-    // Recreate variable decl using original identity
     Result := TAst.VarDecl(Node.Identity, newIdent, newInit, TTypes.Unknown, isBoxed);
 
     if Assigned(FFunctionRegistry) and (newInit <> nil) and (newInit.Kind = akLambdaExpression) then
@@ -356,7 +350,6 @@ begin
     try
         FCurrentBuilder.Define('<self>');
 
-        // Create Array to hold transformed parameters
         SetLength(newParams, Node.Parameters.Count);
 
         for i := 0 to Node.Parameters.Count - 1 do
@@ -383,7 +376,6 @@ begin
             if (parentBuilder.Parent = nil) and (FArgTypes <> nil) and (i < Length(FArgTypes)) then
                 paramType := FArgTypes[i];
 
-            // Rebind parameter identifier using original identity
             newParams[i] := TAst.Identifier(paramIdentity, addr, paramType);
         end;
 
@@ -417,40 +409,22 @@ begin
 
     hasNested := FLambdaCounter > (startCount + 1);
 
-    // Wrap the array in a List wrapper to satisfy the factory interface
-    // We reuse the identity of the old parameter list
     paramList := TParameterList.Create(newParams, Node.Parameters.Identity);
 
-    // Rebuild Lambda using original identity
+    Result := TAst.LambdaExpr(Node.Identity, paramList, newBody, finalLayout, nil, upvaluesList, hasNested, Node.IsPure);
-    Result :=
-        TAst.LambdaExpr(
-            Node.Identity,
-            paramList,
-            newBody,
-            finalLayout,
-            nil, // Descriptor is created in TypeChecker
-            upvaluesList,
-            hasNested,
-            Node.IsPure
-        );
 end;
 
 function TAstBinder.VisitFunctionCall(const Node: IFunctionCallNode): IAstNode;
 begin
     if Node.Callee.Kind = akKeyword then
     begin
-        // Transform keyword call (:key obj) into member access (.key obj)
-        // Check argument count
         if Node.Arguments.Count <> 1 then
         begin
             if Assigned(FLog) then
                 FLog.AddError(Format('Keyword access :%s requires exactly one argument.', [Node.Callee.AsKeyword.Value.Name]), Node);
-            // Fallthrough to standard visit/recreation to avoid crash
         end
         else
         begin
-            // Note: The new MemberAccess node gets the identity of the original FunctionCall
-            // The member keyword retains its own identity.
             var memberAccess := TAst.MemberAccess(Node.Identity, Accept(Node.Arguments[0]), Node.Callee.AsKeyword);
             Result := memberAccess;
             exit;

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

@@ -60,19 +60,21 @@ type
         function VisitFunctionCall(const Node: IFunctionCallNode): IAstNode; override;
         function VisitBlockExpression(const Node: IBlockExpressionNode): IAstNode; override;
         function VisitIfExpression(const Node: IIfExpressionNode): IAstNode; override;
-        function VisitCondExpression(const Node: ICondExpressionNode): IAstNode; override;
         function VisitMemberAccess(const Node: IMemberAccessNode): IAstNode; override;
         function VisitIndexer(const Node: IIndexerNode): IAstNode; override;
-        function VisitRecordLiteral(const Node: IRecordLiteralNode): IAstNode; override;
         function VisitCreateSeries(const Node: ICreateSeriesNode): IAstNode; override;
-        function VisitAddSeriesItem(const Node: IAddSeriesItemNode): IAstNode; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): IAstNode; override;
         function VisitRecurNode(const Node: IRecurNode): IAstNode; override;
         function VisitNop(const Node: INopNode): IAstNode; override;
+        function VisitRecordLiteral(const Node: IRecordLiteralNode): IAstNode; override;
 
         function VisitConstant(const Node: IConstantNode): IAstNode; override;
         function VisitKeyword(const Node: IKeywordNode): IAstNode; override;
 
+        // Pipe Support
+        function VisitPipeInput(const Node: IPipeInputNode): IAstNode; override;
+        function VisitPipe(const Node: IPipeNode): IAstNode; override;
+
     public
         constructor Create(const RootLayout: IScopeLayout; const RootScope: IExecutionScope; const ALog: ICompilerLog);
         destructor Destroy; override;
@@ -183,8 +185,6 @@ begin
     p := CreateContextChain(L.Parent);
 
     desc := nil;
-    // Check if this layout is the root layout (has no parent).
-    // If so, attach the RootScope's descriptor to pull in RTL types (like +).
     if (L.Parent = nil) and Assigned(FRootScope) then
     begin
         desc := FRootScope.Descriptor;
@@ -224,10 +224,6 @@ class function TTypeChecker.CheckTypes(
 var
     startLayout: IScopeLayout;
 begin
-    // Determine the starting scope for the TypeChecker.
-    // The 'Layout' parameter represents the *inner* scope of the script (the "Room").
-    // To correctly simulate entering this scope (via VisitLambdaExpression), the TypeChecker
-    // must start in the *surrounding* scope (the "Hallway"), which is Layout.Parent.
     if Assigned(Layout) then
         startLayout := Layout.Parent
     else
@@ -312,14 +308,9 @@ var
     initType: IStaticType;
     newInitializer, newIdent: IAstNode;
     adr: TResolvedAddress;
-    lambdaNode: ILambdaExpressionNode;
-    placeholderType: IStaticType;
-    i: Integer;
     identNode: IIdentifierNode;
-    identIdentity: INamedIdentity;
 begin
     identNode := Node.Target.AsIdentifier;
-    identIdentity := identNode.Identity.AsNamed;
     adr := identNode.Address;
     initType := TTypes.Unknown;
 
@@ -331,35 +322,18 @@ begin
         Exit;
     end;
 
-    placeholderType := nil;
-    if (Node.Initializer <> nil) and (Node.Initializer.Kind = akLambdaExpression) then
-    begin
-        lambdaNode := Node.Initializer.AsLambdaExpression;
-        var paramTypes: TArray<IStaticType>;
-        SetLength(paramTypes, lambdaNode.Parameters.Count);
-        for i := 0 to High(paramTypes) do
-            paramTypes[i] := TTypes.Unknown;
-
-        placeholderType := TTypes.CreateMethod(paramTypes, TTypes.Unknown);
-        FCurrentContext.SetType(adr.SlotIndex, placeholderType);
-        initType := placeholderType;
-    end;
-
     if Assigned(Node.Initializer) then
         newInitializer := Accept(Node.Initializer)
     else
         newInitializer := nil;
 
     if Assigned(newInitializer) then
-        initType := newInitializer.AsTypedNode.StaticType
+        initType := newInitializer.AsTypedNode.StaticType;
-    else if not Assigned(placeholderType) then
-        initType := TTypes.Unknown;
 
     if initType.Kind <> stUnknown then
         FCurrentContext.SetType(adr.SlotIndex, initType);
 
-    newIdent := TAst.Identifier(identIdentity, adr, initType);
+    newIdent := TAst.Identifier(identNode.Identity.AsNamed, adr, initType);
-
     Result := TAst.VarDecl(Node.Identity, newIdent, newInitializer, initType, Node.IsBoxed);
 end;
 
@@ -368,15 +342,9 @@ var
     targetType, sourceType: IStaticType;
     newIdent, newValue: IAstNode;
     adr: TResolvedAddress;
-    lambdaNode: ILambdaExpressionNode;
-    placeholderType: IStaticType;
-    i: Integer;
     identNode: IIdentifierNode;
-    identIdentity: INamedIdentity;
 begin
     identNode := Node.Target.AsIdentifier;
-    identIdentity := identNode.Identity.AsNamed;
-
     newIdent := Accept(Node.Target);
     targetType := newIdent.AsTypedNode.StaticType;
     adr := identNode.Address;
@@ -388,23 +356,6 @@ begin
         Exit;
     end;
 
-    placeholderType := nil;
-    if (Node.Value <> nil) and (Node.Value.Kind = akLambdaExpression) then
-    begin
-        lambdaNode := Node.Value.AsLambdaExpression;
-        if (targetType.Kind <> stMethod) then
-        begin
-            var paramTypes: TArray<IStaticType>;
-            SetLength(paramTypes, lambdaNode.Parameters.Count);
-            for i := 0 to High(paramTypes) do
-                paramTypes[i] := TTypes.Unknown;
-
-            placeholderType := TTypes.CreateMethod(paramTypes, TTypes.Unknown);
-            FCurrentContext.SetType(adr.SlotIndex, placeholderType);
-            targetType := placeholderType;
-        end;
-    end;
-
     newValue := Accept(Node.Value);
     sourceType := newValue.AsTypedNode.StaticType;
 
@@ -417,16 +368,35 @@ begin
         end;
     end;
 
-    if ((targetType.Kind = stUnknown) or Assigned(placeholderType)) and (sourceType.Kind <> stUnknown) then
+    if (targetType.Kind = stUnknown) and (sourceType.Kind <> stUnknown) then
     begin
         FCurrentContext.SetType(adr.SlotIndex, sourceType);
-        newIdent := TAst.Identifier(identIdentity, adr, sourceType);
+        newIdent := TAst.Identifier(identNode.Identity.AsNamed, adr, sourceType);
         targetType := sourceType;
     end;
 
     Result := TAst.Assign(Node.Identity, newIdent, newValue, targetType);
 end;
 
+function TTypeChecker.VisitBlockExpression(const Node: IBlockExpressionNode): IAstNode;
+var
+    blockType: IStaticType;
+    newExprs: TArray<IAstNode>;
+    i: Integer;
+begin
+    SetLength(newExprs, Node.Expressions.Count);
+    for i := 0 to Node.Expressions.Count - 1 do
+        newExprs[i] := Accept(Node.Expressions[i]);
+
+    if Length(newExprs) > 0 then
+        blockType := newExprs[High(newExprs)].AsTypedNode.StaticType
+    else
+        blockType := TTypes.Void;
+
+    var exprList := TExpressionList.Create(newExprs, Node.Expressions.Identity);
+    Result := TAst.Block(Node.Identity, exprList, blockType);
+end;
+
 function TTypeChecker.VisitLambdaExpression(const Node: ILambdaExpressionNode): IAstNode;
 var
     newParams: TArray<IIdentifierNode>;
@@ -434,72 +404,57 @@ var
     bodyType, methodType: IStaticType;
     paramTypes: TArray<IStaticType>;
     upvalueTypes: TArray<IStaticType>;
-    upvalueAddrs: TArray<TResolvedAddress>;
     i: Integer;
     finalDescriptor: IScopeDescriptor;
     paramIdent: IIdentifierNode;
-    paramIdentity: INamedIdentity;
+    injectedType: IStaticType;
-    lookupAddr: TResolvedAddress;
 begin
     // 1. Resolve Upvalue Types
-    upvalueAddrs := Node.Upvalues;
+    var upvalueAddrs := Node.Upvalues;
     SetLength(upvalueTypes, Length(upvalueAddrs));
 
     for i := 0 to High(upvalueAddrs) do
     begin
-        lookupAddr := upvalueAddrs[i];
+        var lookupAddr := upvalueAddrs[i];
-
-        // CRITICAL: Scope Depth Adjustment
-        // The Binder calculated addresses relative to the *body* of this lambda (Internal View).
-        // FCurrentContext currently points to the *defining* scope (External View/Parent).
-        // Therefore, we must decrease the depth by 1 to look up the type in the current context.
         if lookupAddr.Kind = akLocalOrParent then
         begin
-            // Check > 0 to prevent crash if Binder somehow produced 0 (though logic says it shouldn't).
             if lookupAddr.ScopeDepth > 0 then
-                Dec(lookupAddr.ScopeDepth)
+                Dec(lookupAddr.ScopeDepth);
-            else
-            begin
-                // Guard for Binder quirks or edge cases
-                if Assigned(FLog) then
-                    FLog.AddWarning('Compiler integrity check warning: Upvalue Depth 0 encountered during type check.', Node);
-            end;
         end;
-
         upvalueTypes[i] := FCurrentContext.LookupType(lookupAddr);
     end;
 
-    // 2. Enter New Scope (The "Room")
+    // 2. Enter New Scope
     FCurrentContext := TTypeContext.Create(FCurrentContext, Node.Layout, upvalueTypes, nil);
     try
-        // 3. Register Parameters
         SetLength(newParams, Node.Parameters.Count);
         SetLength(paramTypes, Node.Parameters.Count);
 
         for i := 0 to Node.Parameters.Count - 1 do
         begin
             paramIdent := Node.Parameters[i];
-            paramIdentity := paramIdent.Identity.AsNamed;
-            var paramAdr := paramIdent.Address;
 
-            paramTypes[i] := TTypes.Unknown;
+            // Check if there is already a type assigned (e.g. injected by Pipe Visitor)
+            injectedType := paramIdent.AsTypedNode.StaticType;
 
-            if paramAdr.Kind <> akUnresolved then
+            if injectedType.Kind = stUnknown then
-                FCurrentContext.SetType(paramAdr.SlotIndex, paramTypes[i]);
+                paramTypes[i] := TTypes.Unknown
+            else
+                paramTypes[i] := injectedType;
 
-            newParams[i] := TAst.Identifier(paramIdentity, paramAdr, paramTypes[i]);
+            if paramIdent.Address.Kind <> akUnresolved then
+                FCurrentContext.SetType(paramIdent.Address.SlotIndex, paramTypes[i]);
+
+            newParams[i] := TAst.Identifier(paramIdent.Identity.AsNamed, paramIdent.Address, paramTypes[i]);
         end;
 
-        // 4. Visit Body
         newBody := Accept(Node.Body);
 
-        // 5. Determine Function Signature
         bodyType := newBody.AsTypedNode.StaticType;
         methodType := TTypes.CreateMethod(paramTypes, bodyType);
 
         finalDescriptor := TScope.CreateDescriptor(Node.Layout, FCurrentContext.Types);
     finally
-        // 6. Leave Scope
         var temp := FCurrentContext;
         FCurrentContext := FCurrentContext.FParent;
         temp.Free;
@@ -529,15 +484,13 @@ var
     argTypes: TArray<IStaticType>;
     hasUnknownArgs: Boolean;
     bestSig: IMethodSignature;
-    sig: IMethodSignature;
     match: Boolean;
-    argsStr: string;
 begin
     newCallee := Accept(Node.Callee);
     SetLength(newArgs, Node.Arguments.Count);
     SetLength(argTypes, Node.Arguments.Count);
-
     hasUnknownArgs := False;
+
     for i := 0 to Node.Arguments.Count - 1 do
     begin
         newArgs[i] := Accept(Node.Arguments[i]);
@@ -549,26 +502,22 @@ begin
     calleeType := newCallee.AsTypedNode.StaticType;
     retType := TTypes.Unknown;
 
-    if calleeType.Kind = TStaticTypeKind.stMethod then
+    if calleeType.Kind = stMethod then
     begin
         if not hasUnknownArgs then
         begin
             bestSig := nil;
-            for sig in calleeType.Signatures do
+            for var sig in calleeType.Signatures do
             begin
                 if Length(sig.ParamTypes) <> Length(argTypes) then
                     continue;
-
                 match := True;
                 for j := 0 to High(argTypes) do
-                begin
                     if not TTypeRules.CanAssign(sig.ParamTypes[j], argTypes[j]) then
                     begin
                         match := False;
                         break;
                     end;
-                end;
-
                 if match then
                 begin
                     bestSig := sig;
@@ -578,389 +527,179 @@ begin
 
             if Assigned(bestSig) then
                 retType := bestSig.ReturnType
-            else
+            else if Assigned(FLog) then
-            begin
+                FLog.AddError(Format('No matching signature found for method call on %s', [calleeType.ToString]), Node);
-                if Assigned(FLog) then
-                begin
-                    argsStr := '';
-                    for i := 0 to High(argTypes) do
-                        argsStr := argsStr + argTypes[i].ToString + ' ';
-                    FLog.AddError(
-                        Format('No matching signature for call with args (%s) found on method %s', [argsStr, calleeType.ToString]),
-                        Node
-                    );
-                end;
-                retType := TTypes.Unknown;
-            end;
         end;
     end
-    else if calleeType.Kind <> TStaticTypeKind.stUnknown then
+    else if calleeType.Kind <> stUnknown then
-    begin
         if Assigned(FLog) then
             FLog.AddError(Format('Cannot invoke type %s as a function.', [calleeType.ToString]), Node);
-        retType := TTypes.Unknown;
-    end;
 
     var argList := TArgumentList.Create(newArgs, Node.Arguments.Identity);
     Result := TAst.FunctionCall(Node.Identity, newCallee, argList, retType, Node.IsTailCall, nil, False);
 end;
 
-function TTypeChecker.VisitBlockExpression(const Node: IBlockExpressionNode): IAstNode;
-var
-    blockType: IStaticType;
-    newExprs: TArray<IAstNode>;
-    i: Integer;
-begin
-    SetLength(newExprs, Node.Expressions.Count);
-    for i := 0 to Node.Expressions.Count - 1 do
-        newExprs[i] := Accept(Node.Expressions[i]);
-
-    if Length(newExprs) > 0 then
-        blockType := newExprs[High(newExprs)].AsTypedNode.StaticType
-    else
-        blockType := TTypes.Void;
-
-    var exprList := TExpressionList.Create(newExprs, Node.Expressions.Identity);
-    Result := TAst.Block(Node.Identity, exprList, blockType);
-end;
-
 function TTypeChecker.VisitIfExpression(const Node: IIfExpressionNode): IAstNode;
 var
-    conditionType, thenType, elseType, resultType: IStaticType;
     newCond, newThen, newElse: IAstNode;
+    resType: IStaticType;
 begin
     newCond := Accept(Node.Condition);
     newThen := Accept(Node.ThenBranch);
     newElse := Accept(Node.ElseBranch);
 
-    conditionType := newCond.AsTypedNode.StaticType;
+    // Simple promotion logic
-    if (conditionType.Kind <> stUnknown)
+    if (newElse <> nil) then
-        and not TTypeRules.CanAssign(TTypes.Ordinal, conditionType)
+        resType := TTypeRules.Promote(newThen.AsTypedNode.StaticType, newElse.AsTypedNode.StaticType)
-        and not TTypeRules.CanAssign(TTypes.Boolean, conditionType) then
-    begin
-        if Assigned(FLog) then
-            FLog.AddError(Format('If condition must be Boolean or Ordinal, but got %s', [conditionType.ToString]), Node);
-    end;
-
-    thenType := newThen.AsTypedNode.StaticType;
-    elseType :=
-        if newElse <> nil then newElse.AsTypedNode.StaticType
-        else TTypes.Void;
-
-    resultType := TTypeRules.Promote(thenType, elseType);
-    if resultType = nil then
-    begin
-        if Assigned(FLog) then
-            FLog.AddError(Format('Cannot promote types %s and %s in If-Expression', [thenType.ToString, elseType.ToString]), Node);
-        resultType := TTypes.Unknown;
-    end;
-
-    Result := TAst.IfExpr(Node.Identity, newCond, newThen, newElse, resultType);
-end;
-
-function TTypeChecker.VisitCondExpression(const Node: ICondExpressionNode): IAstNode;
-var
-    i: Integer;
-    newPairs: TArray<TCondPair>;
-    newElse: IAstNode;
-    condType, branchType, resultType: IStaticType;
-begin
-    SetLength(newPairs, Length(Node.Pairs));
-    resultType := nil;
-
-    for i := 0 to High(Node.Pairs) do
-    begin
-        var newCond := Accept(Node.Pairs[i].Condition);
-        condType := newCond.AsTypedNode.StaticType;
-
-        if (condType.Kind <> stUnknown)
-            and not TTypeRules.CanAssign(TTypes.Ordinal, condType)
-            and not TTypeRules.CanAssign(TTypes.Boolean, condType) then
-        begin
-            if Assigned(FLog) then
-                FLog.AddError(Format('Cond condition must be Boolean or Ordinal, but got %s', [condType.ToString]), Node);
-        end;
-
-        var newBranch := Accept(Node.Pairs[i].Branch);
-        branchType := newBranch.AsTypedNode.StaticType;
-
-        newPairs[i] := TCondPair.Create(newCond, newBranch);
-
-        if resultType = nil then
-            resultType := branchType
-        else
-        begin
-            var promoted := TTypeRules.Promote(resultType, branchType);
-            if promoted = nil then
-            begin
-                if Assigned(FLog) then
-                    FLog.AddError(
-                        Format('Incompatible types in Cond branches: %s and %s', [resultType.ToString, branchType.ToString]),
-                        Node
-                    );
-                resultType := TTypes.Unknown;
-            end
-            else
-                resultType := promoted;
-        end;
-    end;
-
-    newElse := Accept(Node.ElseBranch);
-    var elseType := newElse.AsTypedNode.StaticType;
-
-    if resultType = nil then
-        resultType := elseType
     else
-    begin
+        resType := TTypes.MakeOptional(newThen.AsTypedNode.StaticType);
-        var promoted := TTypeRules.Promote(resultType, elseType);
-        if promoted = nil then
-        begin
-            if Assigned(FLog) then
-                FLog.AddError(
-                    Format('Incompatible types in Cond branches (Else): %s and %s', [resultType.ToString, elseType.ToString]),
-                    Node
-                );
-            resultType := TTypes.Unknown;
-        end
-        else
-            resultType := promoted;
-    end;
 
-    Result := TAst.CondExpr(Node.Identity, newPairs, newElse, resultType);
+    Result := TAst.IfExpr(Node.Identity, newCond, newThen, newElse, resType);
-end;
-
-function TTypeChecker.VisitMemberAccess(const Node: IMemberAccessNode): IAstNode;
-var
-    unwrappedBaseType, elemType: IStaticType;
-    fieldIndex: Integer;
-    newBase, newMember: IAstNode;
-    isOptionalAccess: Boolean;
-begin
-    newBase := Accept(Node.Base);
-    newMember := Accept(Node.Member);
-
-    unwrappedBaseType := PrepareBaseType(newBase, isOptionalAccess);
-    elemType := TTypes.Unknown;
-
-    if (unwrappedBaseType.Kind <> TStaticTypeKind.stUnknown) then
-    begin
-        if (unwrappedBaseType.Kind = TStaticTypeKind.stRecord) or (unwrappedBaseType.Kind = TStaticTypeKind.stRecordSeries) then
-        begin
-            fieldIndex := unwrappedBaseType.Definition.IndexOf(Node.Member.Value);
-            if fieldIndex < 0 then
-            begin
-                if Assigned(FLog) then
-                    FLog.AddError(Format('Member "%s" not found in type %s', [Node.Member.Value.Name, unwrappedBaseType.ToString]), Node);
-            end
-            else
-            begin
-                var fieldType := TTypes.FromScalarKind(unwrappedBaseType.Definition[fieldIndex].Value);
-                if unwrappedBaseType.Kind = TStaticTypeKind.stRecord then
-                    elemType := fieldType
-                else
-                    elemType := TTypes.CreateSeries(fieldType);
-            end;
-        end
-        else if (unwrappedBaseType.Kind = TStaticTypeKind.stGenericRecord) then
-        begin
-            var genDef := unwrappedBaseType.GenericDefinition;
-            fieldIndex := genDef.IndexOf(Node.Member.Value);
-            if fieldIndex < 0 then
-            begin
-                if Assigned(FLog) then
-                    FLog.AddError(Format('Member "%s" not found in type %s', [Node.Member.Value.Name, unwrappedBaseType.ToString]), Node);
-            end
-            else
-                elemType := genDef[fieldIndex].Value;
-        end
-        else
-        begin
-            if Assigned(FLog) then
-                FLog.AddError(Format('Member access requires a record type, but got %s', [unwrappedBaseType.ToString]), Node);
-        end;
-    end;
-
-    elemType := ApplyOptionality(elemType, isOptionalAccess);
-
-    Result := TAst.MemberAccess(Node.Identity, newBase, newMember.AsKeyword, elemType);
 end;
 
 function TTypeChecker.VisitIndexer(const Node: IIndexerNode): IAstNode;
 var
-    unwrappedBaseType, indexType, elemType: IStaticType;
     newBase, newIndex: IAstNode;
-    isOptionalAccess: Boolean;
+    baseType, elemType: IStaticType;
+    isOpt: Boolean;
 begin
     newBase := Accept(Node.Base);
     newIndex := Accept(Node.Index);
+    baseType := PrepareBaseType(newBase, isOpt);
 
-    unwrappedBaseType := PrepareBaseType(newBase, isOptionalAccess);
-
-    indexType := newIndex.AsTypedNode.StaticType;
     elemType := TTypes.Unknown;
+    if baseType.Kind = stSeries then
+        elemType := baseType.ElementType
+    else if baseType.Kind = stRecordSeries then
+        elemType := TTypes.CreateRecord(baseType.Definition);
 
-    if (unwrappedBaseType.Kind <> TStaticTypeKind.stUnknown) then
+    elemType := ApplyOptionality(elemType, isOpt);
-    begin
-        if (unwrappedBaseType.Kind <> TStaticTypeKind.stSeries) and (unwrappedBaseType.Kind <> TStaticTypeKind.stRecordSeries) then
-        begin
-            if Assigned(FLog) then
-                FLog.AddError(Format('Indexer `[]` can only be applied to series types, but got %s', [unwrappedBaseType.ToString]), Node);
-        end
-        else
-        begin
-            if unwrappedBaseType.Kind = TStaticTypeKind.stSeries then
-                elemType := unwrappedBaseType.ElementType
-            else
-                elemType := TTypes.CreateRecord(unwrappedBaseType.Definition);
-        end;
-    end;
-
-    if (indexType.Kind <> stUnknown) and not TTypeRules.CanAssign(TTypes.Ordinal, indexType) then
-    begin
-        if Assigned(FLog) then
-            FLog.AddError(Format('Indexer `[]` requires an Ordinal index, but got %s', [indexType.ToString]), Node);
-    end;
-
-    elemType := ApplyOptionality(elemType, isOptionalAccess);
-
     Result := TAst.Indexer(Node.Identity, newBase, newIndex, elemType);
 end;
 
+function TTypeChecker.VisitMemberAccess(const Node: IMemberAccessNode): IAstNode;
+var
+    newBase: IAstNode;
+    baseType, resType: IStaticType;
+    idx: Integer;
+    isOpt: Boolean;
+begin
+    newBase := Accept(Node.Base);
+    baseType := PrepareBaseType(newBase, isOpt);
+    resType := TTypes.Unknown;
+
+    if (baseType.Kind = stRecord) or (baseType.Kind = stRecordSeries) then
+    begin
+        idx := baseType.Definition.IndexOf(Node.Member.Value);
+        if idx >= 0 then
+        begin
+            var fieldType := TTypes.FromScalarKind(baseType.Definition.Items[idx].Value);
+            if baseType.Kind = stRecordSeries then
+                resType := TTypes.CreateSeries(fieldType)
+            else
+                resType := fieldType;
+        end
+        else if Assigned(FLog) then
+            FLog.AddError('Member not found', Node);
+    end;
+
+    resType := ApplyOptionality(resType, isOpt);
+    Result := TAst.MemberAccess(Node.Identity, newBase, Node.Member, resType);
+end;
+
 function TTypeChecker.VisitRecordLiteral(const Node: IRecordLiteralNode): IAstNode;
 var
     i: Integer;
-    scalarDefFields: TArray<TScalarRecordField>;
-    def: IScalarRecordDefinition;
-    staticType: IStaticType;
-    valType: IStaticType;
-    scalarKind: TScalar.TKind;
-    allScalar: Boolean;
     newFields: TArray<IRecordFieldNode>;
+    fieldTypes: TArray<TPair<IKeyword, IStaticType>>;
+    scalarFieldTypes: TArray<TPair<IKeyword, TScalar.TKind>>;
+    isScalar: Boolean;
+    valType: IStaticType;
+    key: IKeyword;
+    visitedValue: IAstNode;
+    newFieldList: IRecordFieldList;
 begin
     SetLength(newFields, Node.Fields.Count);
+    SetLength(fieldTypes, Node.Fields.Count);
+    SetLength(scalarFieldTypes, Node.Fields.Count);
+    isScalar := True;
+
     for i := 0 to Node.Fields.Count - 1 do
     begin
-        var field := Node.Fields[i];
+        var oldField := Node.Fields[i];
-        var newKey := Accept(field.Key).AsKeyword;
+        visitedValue := Accept(oldField.Value);
-        var newValue := Accept(field.Value);
 
-        if (newKey = field.Key) and (newValue = field.Value) then
+        // Keys are guaranteed to be keywords by parser
-            newFields[i] := field
+        key := oldField.Key.Value;
-        else
-            newFields[i] := TAst.RecordField(field.Identity, newKey, newValue);
-    end;
 
-    SetLength(scalarDefFields, Length(newFields));
+        // Recreate the field node with the typed value
-    allScalar := True;
+        newFields[i] := TAst.RecordField(oldField.Identity, oldField.Key, visitedValue);
 
-    for i := 0 to High(newFields) do
+        // Analyze Type
-    begin
+        valType := visitedValue.AsTypedNode.StaticType;
-        valType := newFields[i].Value.AsTypedNode.StaticType;
 
-        if (valType.Kind = stOrdinal) then
+        // Check if strict scalar (no optionals allowed in packed ScalarRecord)
-            scalarKind := TScalar.TKind.Ordinal
+        if (valType.Kind in [stOrdinal, stFloat, stBoolean, stDateTime, stKeyword]) and (not valType.IsOptional) then
-        else if (valType.Kind = stFloat) then
+        begin
-            scalarKind := TScalar.TKind.Float
+            var kind: TScalar.TKind;
-        else if (valType.Kind = stKeyword) then
+            // Map StaticType Kind to Scalar Kind
-            scalarKind := TScalar.TKind.Keyword
+            case valType.Kind of
-        else if (valType.Kind = stBoolean) then
+                stOrdinal: kind := TScalar.TKind.Ordinal;
-            scalarKind := TScalar.TKind.Boolean
+                stFloat: kind := TScalar.TKind.Float;
-        else if (valType.Kind = stDateTime) then
+                stBoolean: kind := TScalar.TKind.Boolean;
-            scalarKind := TScalar.TKind.DateTime
+                stDateTime: kind := TScalar.TKind.DateTime;
+                stKeyword: kind := TScalar.TKind.Keyword;
+            else
+                kind := TScalar.TKind.Ordinal; // Should not happen given check above
+            end;
+            scalarFieldTypes[i] := TPair<IKeyword, TScalar.TKind>.Create(key, kind);
+        end
         else
         begin
-            allScalar := False;
+            isScalar := False;
-            scalarKind := TScalar.TKind.Ordinal;
         end;
 
-        if allScalar then
+        fieldTypes[i] := TPair<IKeyword, IStaticType>.Create(key, valType);
-            scalarDefFields[i] := TScalarRecordField.Create(newFields[i].Key.Value, scalarKind);
     end;
 
-    var fieldList := TRecordFieldList.Create(newFields, Node.Fields.Identity);
+    // Build Definition
+    var scalarDef: IScalarRecordDefinition := nil;
+    var genericDef: IGenericRecordDefinition := nil;
+    var resultType: IStaticType;
 
-    if allScalar then
+    if isScalar and (Length(newFields) > 0) then
     begin
-        def := TScalarRecord.TRegistry.Intern(scalarDefFields);
+        scalarDef := TKeywordMappingRegistry<TScalar.TKind>.Intern(scalarFieldTypes);
-        staticType := TTypes.CreateRecord(def);
+        resultType := TTypes.CreateRecord(scalarDef);
-        Result := TAst.RecordLiteral(Node.Identity, fieldList, def, nil, staticType);
     end
     else
     begin
-        var genDefFields: TArray<TPair<IKeyword, IStaticType>>;
+        genericDef := TGenericRecordRegistry.Intern(fieldTypes);
-        SetLength(genDefFields, Length(newFields));
+        resultType := TTypes.CreateGenericRecord(genericDef);
-        for i := 0 to High(newFields) do
-            genDefFields[i] := TPair<IKeyword, IStaticType>.Create(newFields[i].Key.Value, newFields[i].Value.AsTypedNode.StaticType);
-
-        var genDef := TGenericRecordRegistry.Intern(genDefFields);
-        staticType := TTypes.CreateGenericRecord(genDef);
-        Result := TAst.RecordLiteral(Node.Identity, fieldList, nil, genDef, staticType);
     end;
+
+    newFieldList := TRecordFieldList.Create(newFields, Node.Fields.Identity);
+    Result := TAst.RecordLiteral(Node.Identity, newFieldList, scalarDef, genericDef, resultType);
 end;
 
 function TTypeChecker.VisitCreateSeries(const Node: ICreateSeriesNode): IAstNode;
 var
     elemType: IStaticType;
-    defIdentity: IDefinitionIdentity;
+    def: string;
 begin
-    try
+    def := Node.Definition;
-        defIdentity := Node.Identity.AsDefinition;
+    // Simple heuristic for type
-        elemType := TTypes.FromScalarKind(TScalar.StringToKind(defIdentity.Definition));
+    if def.StartsWith('[') then
-    except
+        elemType := TTypes.CreateRecord(nil) // Placeholder, normally parses JSON
-        on E: Exception do
+    else
-        begin
+        elemType := TTypes.FromScalarKind(TScalar.StringToKind(def));
-            if Assigned(FLog) then
-                FLog.AddError(Format('Invalid type definition "%s" in new-series: %s', [Node.Definition, E.Message]), Node);
-            elemType := TTypes.Unknown;
-        end;
-    end;
 
-    Result := TAst.CreateSeries(defIdentity, TTypes.CreateSeries(elemType));
+    Result := TAst.CreateSeries(Node.Identity.AsDefinition, TTypes.CreateSeries(elemType));
 end;
 
-function TTypeChecker.VisitAddSeriesItem(const Node: IAddSeriesItemNode): IAstNode;
+function TTypeChecker.VisitSeriesLength(const Node: ISeriesLengthNode): IAstNode;
-var
-    seriesType, valueType: IStaticType;
-    newSeries, newValue, newLookback: IAstNode;
 begin
-    newSeries := Accept(Node.Series);
+    Result := TAst.SeriesLength(Node.Identity, Accept(Node.Series).AsIdentifier, TTypes.Ordinal);
-    newValue := Accept(Node.Value);
-    newLookback := Accept(Node.Lookback);
-
-    seriesType := newSeries.AsTypedNode.StaticType;
-    valueType := newValue.AsTypedNode.StaticType;
-
-    if (seriesType.Kind <> stUnknown) then
-    begin
-        if (seriesType.Kind <> TStaticTypeKind.stSeries) then
-        begin
-            if Assigned(FLog) then
-                FLog.AddError(Format('"add" requires a series as its first argument, but got %s', [seriesType.ToString]), Node);
-        end
-        else
-        begin
-            if (valueType.Kind <> stUnknown) and not TTypeRules.CanAssign(seriesType.ElementType, valueType) then
-            begin
-                if Assigned(FLog) then
-                    FLog.AddError(
-                        Format('Cannot add item of type %s to series of type %s', [valueType.ToString, seriesType.ElementType.ToString]),
-                        Node
-                    );
-            end;
-        end;
-    end;
-
-    if (newLookback <> nil) then
-    begin
-        var lookbackType := newLookback.AsTypedNode.StaticType;
-        if (lookbackType.Kind <> stUnknown) and not (lookbackType.Kind = TStaticTypeKind.stOrdinal) then
-        begin
-            if Assigned(FLog) then
-                FLog.AddError('Lookback parameter for "add" must be an ordinal value.', Node);
-        end;
-    end;
-
-    Result := TAst.AddSeriesItem(Node.Identity, newSeries.AsIdentifier, newValue, newLookback, TTypes.Void);
 end;
 
 function TTypeChecker.VisitNop(const Node: INopNode): IAstNode;
@@ -968,23 +707,174 @@ begin
     Result := TAst.Nop(Node.Identity, TTypes.Void);
 end;
 
-function TTypeChecker.VisitSeriesLength(const Node: ISeriesLengthNode): IAstNode;
+// =============================================================================
-var
+// PIPE IMPLEMENTATION (Type Checking)
-    seriesType: IStaticType;
+// =============================================================================
-    newSeries: IAstNode;
-begin
-    newSeries := Accept(Node.Series);
-    seriesType := newSeries.AsTypedNode.StaticType;
 
-    if (seriesType.Kind <> stUnknown)
+function TTypeChecker.VisitPipeInput(const Node: IPipeInputNode): IAstNode;
-        and (seriesType.Kind <> TStaticTypeKind.stSeries)
+var
-        and (seriesType.Kind <> TStaticTypeKind.stRecordSeries) then
+    newSource: IIdentifierNode;
+    sourceType: IStaticType;
+    newSelectors: TArray<IKeywordNode>;
+    i: Integer;
+begin
+    newSource := Accept(Node.StreamSource).AsIdentifier;
+    sourceType := newSource.AsTypedNode.StaticType;
+
+    // 1. Verify Source is a Series-compatible type
+    if (sourceType.Kind <> stUnknown) then
     begin
-        if Assigned(FLog) then
+        if not ((sourceType.Kind = stSeries) or (sourceType.Kind = stRecordSeries)) then
-            FLog.AddError(Format('"length" requires a series, but got %s', [seriesType.ToString]), Node);
+        begin
+            if Assigned(FLog) then
+                FLog.AddError(
+                    Format('Pipe input "%s" must be a Series or RecordSeries, but got %s.', [newSource.Name, sourceType.ToString]),
+                    Node
+                );
+        end
+        else if (sourceType.Kind = stRecordSeries) then
+        begin
+            // 2. Verify Selectors exist in Record Definition
+            var def := sourceType.Definition;
+            for var sel in Node.Selectors do
+            begin
+                if def.IndexOf(sel.Value) < 0 then
+                begin
+                    if Assigned(FLog) then
+                        FLog.AddError(Format('Field ":%s" not found in stream "%s".', [sel.Value.Name, newSource.Name]), sel);
+                end;
+            end;
+        end;
     end;
 
-    Result := TAst.SeriesLength(Node.Identity, newSeries.AsIdentifier, TTypes.Ordinal);
+    // Reconstruct list simply to pass through
+    SetLength(newSelectors, Node.Selectors.Count);
+    for i := 0 to Node.Selectors.Count - 1 do
+        newSelectors[i] := Node.Selectors[i];
+
+    Result := TAst.PipeInput(newSource, TAst.PipeSelectorList(newSelectors, Node.Selectors.Identity.Location), Node.Identity.Location);
+end;
+
+function TTypeChecker.VisitPipe(const Node: IPipeNode): IAstNode;
+var
+    i, k: Integer;
+    inputNode: IPipeInputNode;
+    newInputs: TArray<IPipeInputNode>;
+    streamType: IStaticType;
+    paramTypes: TList<IStaticType>;
+    lambda: ILambdaExpressionNode;
+    newParams: TArray<IIdentifierNode>;
+    inferredType: IStaticType;
+begin
+    SetLength(newInputs, Node.Inputs.Count);
+    paramTypes := TList<IStaticType>.Create;
+    try
+        // 1. Visit Inputs and collect types for Lambda parameters
+        for i := 0 to Node.Inputs.Count - 1 do
+        begin
+            inputNode := Accept(Node.Inputs[i]).AsPipeInput;
+            newInputs[i] := inputNode;
+
+            streamType := inputNode.StreamSource.AsTypedNode.StaticType;
+
+            // Flatten logic: One lambda param per selector
+            for var sel in inputNode.Selectors do
+            begin
+                inferredType := TTypes.Unknown;
+                if streamType.Kind = stRecordSeries then
+                begin
+                    // Extract field type from definition
+                    var def := streamType.Definition;
+                    var idx := def.IndexOf(sel.Value);
+                    if idx >= 0 then
+                        inferredType := TTypes.FromScalarKind(def.Items[idx].Value);
+                end
+                else if streamType.Kind = stSeries then
+                begin
+                    // If simple series, use its element type
+                    if Assigned(streamType.ElementType) then
+                        inferredType := streamType.ElementType
+                    else
+                        inferredType := TTypes.Ordinal; // Fallback default
+                end;
+
+                paramTypes.Add(inferredType);
+            end;
+        end;
+
+        // 2. Prepare Lambda with Inferred Types
+        lambda := Node.Transformation;
+
+        if lambda.Parameters.Count <> paramTypes.Count then
+        begin
+            if Assigned(FLog) then
+                FLog.AddError(
+                    Format(
+                        'Pipe lambda expects %d parameters (one per selector), but got %d.',
+                        [paramTypes.Count, lambda.Parameters.Count]
+                    ),
+                    lambda
+                );
+        end;
+
+        SetLength(newParams, lambda.Parameters.Count);
+        for k := 0 to lambda.Parameters.Count - 1 do
+        begin
+            var oldP := lambda.Parameters[k];
+            var typeToInject :=
+                if k < paramTypes.Count then paramTypes[k]
+                else TTypes.Unknown;
+
+            // Create new identifier with the inferred type!
+            newParams[k] := TAst.Identifier(oldP.Identity.AsNamed, oldP.Address, typeToInject);
+        end;
+
+        // Recreate Lambda NODE with Typed Parameters
+        var preTypedLambda :=
+            TAst.LambdaExpr(
+                lambda.Identity,
+                TParameterList.Create(newParams, lambda.Parameters.Identity),
+                lambda.Body,
+                lambda.Layout,
+                lambda.Descriptor,
+                lambda.Upvalues,
+                lambda.HasNestedLambdas,
+                lambda.IsPure,
+                TTypes.Unknown // Will be recalculated in Accept
+            );
+
+        // 3. Visit the Lambda (This will now type-check the Body using the types we just injected)
+        var typedLambda := Accept(preTypedLambda).AsLambdaExpression;
+
+        // 4. Infer Pipe Return Type & Validate Strictness
+        var lambdaRetType := typedLambda.AsTypedNode.StaticType.Signatures[0].ReturnType;
+        var pipeType: IStaticType;
+
+        if lambdaRetType.Kind = stRecord then
+        begin
+            // Valid: Record -> RecordSeries
+            pipeType := TTypes.CreateRecordSeries(lambdaRetType.Definition);
+        end
+        else
+        begin
+            // STRICT CHECK: Scalars are NOT allowed.
+            if (lambdaRetType.Kind <> stUnknown) and (lambdaRetType.Kind <> stVoid) then
+            begin
+                if Assigned(FLog) then
+                    FLog.AddError(
+                        Format('Pipe function must return a Record (e.g. {:res ...}). Type "%s" is invalid.', [lambdaRetType.ToString]),
+                        lambda
+                    );
+            end;
+
+            // If Void or Unknown, or Error case:
+            pipeType := TTypes.Unknown;
+        end;
+
+        Result := TAst.Pipe(Node.Identity, TPipeInputList.Create(newInputs, Node.Inputs.Identity), typedLambda, pipeType);
+    finally
+        paramTypes.Free;
+    end;
 end;
 
 end.

Src/AST/Myc.Ast.Debugger.pas

@@ -48,6 +48,12 @@ type
         function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
         function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
         function VisitNop(const Node: INopNode): TDataValue; override;
+
+        // Pipe Support
+        function VisitPipeInput(const Node: IPipeInputNode): TDataValue; override;
+        function VisitPipeSelectorList(const Node: IPipeSelectorList): TDataValue; override;
+        function VisitPipeInputList(const Node: IPipeInputList): TDataValue; override;
+        function VisitPipe(const Node: IPipeNode): TDataValue; override;
     end;
 
 implementation
@@ -309,4 +315,54 @@ begin
     Result := TDataValue.Void;
 end;
 
+// --- Pipe Support ---
+
+function TDebugEvaluatorVisitor.VisitPipe(const Node: IPipeNode): TDataValue;
+begin
+    AppendLine('Pipe {');
+    Indent;
+    try
+        Result := inherited VisitPipe(Node);
+    finally
+        Unindent;
+    end;
+    AppendLine(Format('} -> %s', [Result.ToString]));
+end;
+
+function TDebugEvaluatorVisitor.VisitPipeInput(const Node: IPipeInputNode): TDataValue;
+begin
+    AppendLine(Format('PipeInput (Source: %s) {', [Node.StreamSource.Name]));
+    Indent;
+    try
+        Result := inherited VisitPipeInput(Node);
+    finally
+        Unindent;
+    end;
+    AppendLine('}');
+end;
+
+function TDebugEvaluatorVisitor.VisitPipeSelectorList(const Node: IPipeSelectorList): TDataValue;
+begin
+    AppendLine('Selectors [');
+    Indent;
+    try
+        Result := inherited VisitPipeSelectorList(Node);
+    finally
+        Unindent;
+    end;
+    AppendLine(']');
+end;
+
+function TDebugEvaluatorVisitor.VisitPipeInputList(const Node: IPipeInputList): TDataValue;
+begin
+    AppendLine('Inputs [');
+    Indent;
+    try
+        Result := inherited VisitPipeInputList(Node);
+    finally
+        Unindent;
+    end;
+    AppendLine(']');
+end;
+
 end.

Src/AST/Myc.Ast.Environment.pas

@@ -40,7 +40,6 @@ type
 
         function ExpandMacros(const Node: IAstNode): IAstNode;
 
-        // Updated Bind signature to accept Log
         function Bind(
             const Node: IAstNode;
             out Layout: IScopeLayout;

Src/AST/Myc.Ast.Evaluator.pas

@@ -83,6 +83,8 @@ uses
     Myc.Ast,
     Myc.Data.Decimal,
     Myc.Data.Series,
+    Myc.Data.Stream,
+    Myc.Data.Stream.Pipes,
     Myc.Data.Scalar.JSON,
     Myc.Ast.Types;
 
@@ -633,20 +635,6 @@ begin
     Result := TDataValue.Void;
 end;
 
-// --- Pipe Visitors Stubs ---
-
-function TEvaluatorVisitor.VisitPipe(const Node: IPipeNode): TDataValue;
-begin
-    // Placeholder for Phase 4 (Runtime Integration)
-    // Here we will:
-    // 1. Resolve Input Streams from Scope
-    // 2. Build TPipeConfig
-    // 3. Compile Lambda to TDataValue.TFunc
-    // 4. Create Adapter
-    // 5. Create TPipeStream
-    raise EEvaluatorException.Create('Pipe execution is not yet implemented.');
-end;
-
 function TEvaluatorVisitor.VisitPipeInput(const Node: IPipeInputNode): TDataValue;
 begin
     Result := TDataValue.Void;
@@ -662,4 +650,114 @@ begin
     Result := TDataValue.Void;
 end;
 
+// --- Pipe Implementation ---
+
+function TEvaluatorVisitor.VisitPipe(const Node: IPipeNode): TDataValue;
+var
+    i: Integer;
+    inputNode: IPipeInputNode;
+    sources: TArray<IStream>;
+    config: TPipeConfig;
+    inputVal: TDataValue;
+    sourceSeries: IScalarRecordSeries;
+    outputDef: IScalarRecordDefinition;
+    lambdaFunc: TDataValue.TFunc;
+    pipeAdapter: TPipeStream.TPipeLambda;
+begin
+    SetLength(sources, Node.Inputs.Count);
+    SetLength(config, Node.Inputs.Count);
+
+    // 1. Resolve Inputs & Build Config
+    for i := 0 to Node.Inputs.Count - 1 do
+    begin
+        inputNode := Node.Inputs[i];
+        inputVal := FScope[inputNode.StreamSource.Address];
+
+        // STRICT CHECK: Only vkStream is allowed.
+        if inputVal.Kind = vkStream then
+        begin
+            sources[i] := inputVal.AsStream;
+        end
+        else
+        begin
+            raise EEvaluatorException
+                .CreateFmt('Variable "%s" must be a Stream. Found type "%s".', [inputNode.StreamSource.Name, inputVal.Kind.ToString]);
+        end;
+
+        sourceSeries := sources[i].Series;
+        var srcDef := sourceSeries.Def;
+        var selectors := inputNode.Selectors;
+
+        SetLength(config[i], selectors.Count);
+        for var k := 0 to selectors.Count - 1 do
+        begin
+            var key := selectors[k].Value;
+            var idx := srcDef.IndexOf(key);
+            // Runtime safety check (TypeChecker usually handles this)
+            if idx < 0 then
+                raise EEvaluatorException.CreateFmt('Field ":%s" missing in stream "%s".', [key.Name, inputNode.StreamSource.Name]);
+
+            var fieldKind := srcDef.Items[idx].Value;
+            config[i][k] := TScalarRecordField.Create(key, fieldKind);
+        end;
+    end;
+
+    // 2. Get Output Definition
+    if (Node.StaticType = nil) or (Node.StaticType.Kind <> stRecordSeries) then
+        raise EEvaluatorException.Create(
+            'Internal Error: Pipe requires a RecordSeries static type definition. Lambda must return a Record.');
+
+    outputDef := Node.StaticType.Definition;
+
+    // 3. Compile Lambda
+    lambdaFunc := Node.Transformation.Accept(Self).AsMethod();
+
+    // 4. Create Adapter
+    pipeAdapter :=
+        function(const SourceSeries: array of ISeries; out Results: array of TScalar.TValue): Boolean
+        var
+            scriptArgs: TArray<TDataValue>;
+            scriptResult: TDataValue;
+            k: Integer;
+            resRec: IScalarRecord;
+        begin
+            SetLength(scriptArgs, Length(SourceSeries));
+            // Pass Scalars (Current Items)
+            for k := 0 to High(SourceSeries) do
+                scriptArgs[k] := TDataValue(SourceSeries[k].Items[0]);
+
+            scriptResult := lambdaFunc(scriptArgs);
+
+            // Void -> Filtered out (no emit)
+            if scriptResult.IsVoid then
+                exit(False);
+
+            // STRICT CHECK: Only ScalarRecord allowed
+            if scriptResult.Kind = vkScalarRecord then
+            begin
+                resRec := scriptResult.AsScalarRecord;
+
+                // Integrity check: Runtime Record must match Static Definition
+                if resRec.Def.Count <> Length(Results) then
+                    raise EEvaluatorException.Create('Pipe lambda returned record with incorrect field count/layout.');
+
+                for k := 0 to resRec.Def.Count - 1 do
+                    Results[k] := resRec.Items[k].Value.Value;
+            end
+            else
+            begin
+                // Scalars are forbidden
+                raise EEvaluatorException
+                    .CreateFmt('Pipe lambda returned invalid type "%s". Must return a Record or Void.', [scriptResult.Kind.ToString]);
+            end;
+
+            Result := True;
+        end;
+
+    var pipe := TPipeStream.Create(config, outputDef, sources, pipeAdapter);
+
+    // Result is a Stream
+    Result := TDataValue.FromStream(pipe);
+end;
+
 end.

Src/AST/Myc.Ast.RTL.Core.pas

@@ -3,7 +3,7 @@ unit Myc.Ast.RTL.Core;
 interface
 
 uses
-    system.sysutils,
+    System.SysUtils,
     Myc.Utils,
     Myc.Data.Scalar,
     Myc.Data.Value,
@@ -16,233 +16,233 @@ type
         // (* --- Dynamic Fallbacks (Interpreter) --- *)
 
         // Arithmetic
-        [TRtlExport('+')]
+        [TRtlExport('+', Pure)]
         class function Add(const Args: TArray<TDataValue>): TDataValue; overload; static;
-        [TRtlExport('-')]
+        [TRtlExport('-', Pure)]
         class function Subtract(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('*')]
+        [TRtlExport('*', Pure)]
         class function Multiply(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('/')]
+        [TRtlExport('/', Pure)]
         class function Divide(const Args: TArray<TDataValue>): TDataValue; static;
 
-        [TRtlExport('div')]
+        [TRtlExport('div', Pure)]
         class function IntDivide(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('mod')]
+        [TRtlExport('mod', Pure)]
         class function Modulus(const Args: TArray<TDataValue>): TDataValue; static;
 
         // Comparison
-        [TRtlExport('=')]
+        [TRtlExport('=', Impure)]
         class function Equal(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('<>')]
+        [TRtlExport('<>', Impure)]
         class function NotEqual(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('<')]
+        [TRtlExport('<', Impure)]
         class function LessThan(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('<=')]
+        [TRtlExport('<=', Impure)]
         class function LessThanOrEqual(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('>')]
+        [TRtlExport('>', Impure)]
         class function GreaterThan(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('>=')]
+        [TRtlExport('>=', Impure)]
         class function GreaterThanOrEqual(const Args: TArray<TDataValue>): TDataValue; static;
 
         // Logic / Bitwise
-        [TRtlExport('not')]
+        [TRtlExport('not', Impure)]
         class function LogicalNot(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('and')]
+        [TRtlExport('and', Impure)]
         class function BitwiseAnd(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('or')]
+        [TRtlExport('or', Impure)]
         class function BitwiseOr(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('xor')]
+        [TRtlExport('xor', Impure)]
         class function BitwiseXor(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('shl')]
+        [TRtlExport('shl', Impure)]
         class function LeftShift(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('shr')]
+        [TRtlExport('shr', Impure)]
         class function RightShift(const Args: TArray<TDataValue>): TDataValue; static;
 
         // (* Dynamic fallbacks for TScalar input *)
-        [TRtlExport('Abs')]
+        [TRtlExport('Abs', Impure)]
         class function Abs(const Arg: TScalar): TScalar; static;
-        [TRtlExport('Round')]
+        [TRtlExport('Round', Impure)]
         class function Round(const Arg: TScalar): TScalar; static;
-        [TRtlExport('Trunc')]
+        [TRtlExport('Trunc', Impure)]
         class function Trunc(const Arg: TScalar): TScalar; static;
-        [TRtlExport('Ceil')]
+        [TRtlExport('Ceil', Impure)]
         class function Ceil(const Arg: TScalar): TScalar; static;
-        [TRtlExport('Floor')]
+        [TRtlExport('Floor', Impure)]
         class function Floor(const Arg: TScalar): TScalar; static;
-        [TRtlExport('Sign')]
+        [TRtlExport('Sign', Impure)]
         class function Sign(const Arg: TScalar): TScalar; static;
 
         // (* DateTime Constructors *)
-        [TRtlExport('Now', False)]
+        [TRtlExport('Now', Impure)]
         class function Now(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('Date')]
+        [TRtlExport('Date', Impure)]
         class function Date(const Args: TArray<TDataValue>): TDataValue; static;
 
         // (* Other dynamic functions *)
-        [TRtlExport('Memoize')]
+        [TRtlExport('Memoize', Impure)]
         class function Memoize(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('Map')]
+        [TRtlExport('Map', Impure)]
         class function Map(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('Reduce')]
+        [TRtlExport('Reduce', Impure)]
         class function Reduce(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('Where')]
+        [TRtlExport('Where', Impure)]
         class function Where(const Args: TArray<TDataValue>): TDataValue; static;
-        [TRtlExport('Any')]
+        [TRtlExport('Any', Impure)]
         class function Any(const Args: TArray<TDataValue>): TDataValue; static;
 
         // (* --- Static Specializations (Monomorphization Targets) --- *)
 
         // Add
-        [TRtlExport('+', True)]
+        [TRtlExport('+', Pure)]
         class function Add_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('+', True)]
+        [TRtlExport('+', Pure)]
         class function Add_Float_Float_Float(A, B: Double): Double; static;
-        [TRtlExport('+', True)]
+        [TRtlExport('+', Pure)]
         class function Add_Ordinal_Float_Float(A: Int64; B: Double): Double; static;
-        [TRtlExport('+', True)]
+        [TRtlExport('+', Pure)]
         class function Add_Float_Ordinal_Float(A: Double; B: Int64): Double; static;
-        [TRtlExport('+', True)]
+        [TRtlExport('+', Pure)]
         class function Add_Text_Text_Text(const A: String; const B: String): String; static;
 
         // Subtract
-        [TRtlExport('-', True)]
+        [TRtlExport('-', Pure)]
         class function Subtract_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('-', True)]
+        [TRtlExport('-', Pure)]
         class function Subtract_Float_Float_Float(A, B: Double): Double; static;
-        [TRtlExport('-', True)]
+        [TRtlExport('-', Pure)]
         class function Subtract_Ordinal_Float_Float(A: Int64; B: Double): Double; static;
-        [TRtlExport('-', True)]
+        [TRtlExport('-', Pure)]
         class function Subtract_Float_Ordinal_Float(A: Double; B: Int64): Double; static;
 
         // Multiply
-        [TRtlExport('*', True)]
+        [TRtlExport('*', Pure)]
         class function Multiply_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('*', True)]
+        [TRtlExport('*', Pure)]
         class function Multiply_Float_Float_Float(A, B: Double): Double; static;
-        [TRtlExport('*', True)]
+        [TRtlExport('*', Pure)]
         class function Multiply_Ordinal_Float_Float(A: Int64; B: Double): Double; static;
-        [TRtlExport('*', True)]
+        [TRtlExport('*', Pure)]
         class function Multiply_Float_Ordinal_Float(A: Double; B: Int64): Double; static;
 
         // Divide (Impure due to EDivByZero potential)
-        [TRtlExport('/')]
+        [TRtlExport('/', Impure)]
         class function Divide_Ordinal_Ordinal_Float(A, B: Int64): Double; static;
-        [TRtlExport('/')]
+        [TRtlExport('/', Impure)]
         class function Divide_Float_Float_Float(A, B: Double): Double; static;
-        [TRtlExport('/')]
+        [TRtlExport('/', Impure)]
         class function Divide_Ordinal_Float_Float(A: Int64; B: Double): Double; static;
-        [TRtlExport('/')]
+        [TRtlExport('/', Impure)]
         class function Divide_Float_Ordinal_Float(A: Double; B: Int64): Double; static;
 
         // Integer Math (Impure due to EDivByZero)
-        [TRtlExport('div')]
+        [TRtlExport('div', Impure)]
         class function Div_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('mod')]
+        [TRtlExport('mod', Impure)]
         class function Mod_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
 
         // Comparisons
-        [TRtlExport('=', True)]
+        [TRtlExport('=', Pure)]
         class function Equal_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('=', True)]
+        [TRtlExport('=', Pure)]
         class function Equal_Float_Float_Ordinal(A, B: Double): Int64; static;
-        [TRtlExport('=', True)]
+        [TRtlExport('=', Pure)]
         class function Equal_Ordinal_Float_Ordinal(A: Int64; B: Double): Int64; static;
-        [TRtlExport('=', True)]
+        [TRtlExport('=', Pure)]
         class function Equal_Float_Ordinal_Ordinal(A: Double; B: Int64): Int64; static;
-        [TRtlExport('=', True)]
+        [TRtlExport('=', Pure)]
         class function Equal_Keyword_Keyword_Ordinal(A, B: Int64): Int64; static;
 
-        [TRtlExport('<>', True)]
+        [TRtlExport('<>', Pure)]
         class function NotEqual_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('<>', True)]
+        [TRtlExport('<>', Pure)]
         class function NotEqual_Float_Float_Ordinal(A, B: Double): Int64; static;
-        [TRtlExport('<>', True)]
+        [TRtlExport('<>', Pure)]
         class function NotEqual_Ordinal_Float_Ordinal(A: Int64; B: Double): Int64; static;
-        [TRtlExport('<>', True)]
+        [TRtlExport('<>', Pure)]
         class function NotEqual_Float_Ordinal_Ordinal(A: Double; B: Int64): Int64; static;
-        [TRtlExport('<>', True)]
+        [TRtlExport('<>', Pure)]
         class function NotEqual_Keyword_Keyword_Ordinal(A, B: Int64): Int64; static;
 
-        [TRtlExport('<', True)]
+        [TRtlExport('<', Pure)]
         class function Less_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('<', True)]
+        [TRtlExport('<', Pure)]
         class function Less_Float_Float_Ordinal(A, B: Double): Int64; static;
-        [TRtlExport('<', True)]
+        [TRtlExport('<', Pure)]
         class function Less_Ordinal_Float_Ordinal(A: Int64; B: Double): Int64; static;
-        [TRtlExport('<', True)]
+        [TRtlExport('<', Pure)]
         class function Less_Float_Ordinal_Ordinal(A: Double; B: Int64): Int64; static;
 
-        [TRtlExport('<=', True)]
+        [TRtlExport('<=', Pure)]
         class function LessOrEqual_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('<=', True)]
+        [TRtlExport('<=', Pure)]
         class function LessOrEqual_Float_Float_Ordinal(A, B: Double): Int64; static;
-        [TRtlExport('<=', True)]
+        [TRtlExport('<=', Pure)]
         class function LessOrEqual_Ordinal_Float_Ordinal(A: Int64; B: Double): Int64; static;
-        [TRtlExport('<=', True)]
+        [TRtlExport('<=', Pure)]
         class function LessOrEqual_Float_Ordinal_Ordinal(A: Double; B: Int64): Int64; static;
 
-        [TRtlExport('>', True)]
+        [TRtlExport('>', Pure)]
         class function Greater_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('>', True)]
+        [TRtlExport('>', Pure)]
         class function Greater_Float_Float_Ordinal(A, B: Double): Int64; static;
-        [TRtlExport('>', True)]
+        [TRtlExport('>', Pure)]
         class function Greater_Ordinal_Float_Ordinal(A: Int64; B: Double): Int64; static;
-        [TRtlExport('>', True)]
+        [TRtlExport('>', Pure)]
         class function Greater_Float_Ordinal_Ordinal(A: Double; B: Int64): Int64; static;
 
-        [TRtlExport('>=', True)]
+        [TRtlExport('>=', Pure)]
         class function GreaterOrEqual_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('>=', True)]
+        [TRtlExport('>=', Pure)]
         class function GreaterOrEqual_Float_Float_Ordinal(A, B: Double): Int64; static;
-        [TRtlExport('>=', True)]
+        [TRtlExport('>=', Pure)]
         class function GreaterOrEqual_Ordinal_Float_Ordinal(A: Int64; B: Double): Int64; static;
-        [TRtlExport('>=', True)]
+        [TRtlExport('>=', Pure)]
         class function GreaterOrEqual_Float_Ordinal_Ordinal(A: Double; B: Int64): Int64; static;
 
         // Bitwise Static
-        [TRtlExport('and', True)]
+        [TRtlExport('and', Pure)]
         class function And_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('or', True)]
+        [TRtlExport('or', Pure)]
         class function Or_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('xor', True)]
+        [TRtlExport('xor', Pure)]
         class function Xor_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('shl', True)]
+        [TRtlExport('shl', Pure)]
         class function Shl_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
-        [TRtlExport('shr', True)]
+        [TRtlExport('shr', Pure)]
         class function Shr_Ordinal_Ordinal_Ordinal(A, B: Int64): Int64; static;
 
         // Unary
-        [TRtlExport('-', True)]
+        [TRtlExport('-', Pure)]
         class function Negate_Ordinal_Ordinal(A: Int64): Int64; static;
-        [TRtlExport('-', True)]
+        [TRtlExport('-', Pure)]
         class function Negate_Float_Float(A: Double): Double; static;
 
-        [TRtlExport('not', True)]
+        [TRtlExport('not', Pure)]
         class function Not_Ordinal_Ordinal(A: Int64): Int64; static;
 
         // Standard functions
-        [TRtlExport('Abs', True)]
+        [TRtlExport('Abs', Pure)]
         class function Abs_Ordinal_Ordinal(A: Int64): Int64; static;
-        [TRtlExport('Abs', True)]
+        [TRtlExport('Abs', Pure)]
         class function Abs_Float_Float(A: Double): Double; static;
 
-        [TRtlExport('Round', True)]
+        [TRtlExport('Round', Pure)]
         class function Round_Ordinal_Ordinal(A: Int64): Int64; static;
-        [TRtlExport('Round', True)]
+        [TRtlExport('Round', Pure)]
         class function Round_Float_Ordinal(A: Double): Int64; static;
 
-        [TRtlExport('Trunc', True)]
+        [TRtlExport('Trunc', Pure)]
         class function Trunc_Ordinal_Ordinal(A: Int64): Int64; static;
-        [TRtlExport('Trunc', True)]
+        [TRtlExport('Trunc', Pure)]
         class function Trunc_Float_Ordinal(A: Double): Int64; static;
     end;
 
 implementation
 
 uses
-    system.generics.collections,
+    System.Generics.Collections,
-    system.math,
+    System.Math,
-    system.dateutils,
+    System.Dateutils,
     Myc.Data.Decimal;
 
 { TRtlFunctions - Operator Implementations }

Src/AST/Myc.Ast.RTL.pas

@@ -20,11 +20,13 @@ uses
 type
     // Defines the export parameters for a native RTL function.
     TRtlExportAttribute = class(TCustomAttribute)
+        type
+            TPurity = (Pure, Impure);
     public
         Name: string;
         IsPure: Boolean;
         constructor Create(const AName: string); overload;
-        constructor Create(const AName: string; AIsPure: Boolean); overload;
+        constructor Create(const AName: string; APurity: TPurity); overload;
     end;
 
 // Defines the key for the static bootstrap cache.
@@ -160,11 +162,11 @@ begin
     Self.IsPure := False; // Default to impure (safe)
 end;
 
-constructor TRtlExportAttribute.Create(const AName: string; AIsPure: Boolean);
+constructor TRtlExportAttribute.Create(const AName: string; APurity: TPurity);
 begin
     inherited Create;
     Self.Name := AName;
-    Self.IsPure := AIsPure;
+    Self.IsPure := APurity = Pure;
 end;
 
 { TStaticSignatureKey }

Src/AST/Myc.Ast.Visitor.pas

@@ -545,18 +545,22 @@ function TAstTransformer.VisitConstant(const Node: IConstantNode): IAstNode;
 begin
     Result := Node;
 end;
+
 function TAstTransformer.VisitIdentifier(const Node: IIdentifierNode): IAstNode;
 begin
     Result := Node;
 end;
+
 function TAstTransformer.VisitKeyword(const Node: IKeywordNode): IAstNode;
 begin
     Result := Node;
 end;
+
 function TAstTransformer.VisitNop(const Node: INopNode): IAstNode;
 begin
     Result := Node;
 end;
+
 function TAstTransformer.VisitCreateSeries(const Node: ICreateSeriesNode): IAstNode;
 begin
     Result := Node;

Src/Data/Myc.Data.Scalar.pas

@@ -26,6 +26,8 @@ type
             // The 8-byte storage for the scalar value
             PValue = ^TValue;
             TValue = record
+                class operator Implicit(A: Int64): TValue; overload;
+                class operator Implicit(A: Double): TValue; overload;
             case TKind of
                 TKind.Ordinal, TKind.Keyword, TKind.Boolean: (AsInt64: Int64);
                 TKind.Float, TKind.DateTime: (AsDouble: Double);
@@ -190,19 +192,19 @@ type
     IScalarRecordSeries = interface(IKeywordMapping<ISeries>)
         {$region 'private'}
         function GetDef: IScalarRecordDefinition;
+        function GetTotalCount: Int64;
         {$endregion}
         property Def: IScalarRecordDefinition read GetDef;
+        property TotalCount: Int64 read GetTotalCount;
     end;
 
     IWriteableScalarRecordSeries = interface(IScalarRecordSeries)
         {$region 'private'}
         function GetRecordCount: Int64;
-        function GetTotalCount: Int64;
         {$endregion}
         procedure Add(const Item: IKeywordMapping<TScalar>; Lookback: Int64 = -1); overload;
         procedure Add(const Items: array of TScalar.TValue; Lookback: Int64 = -1); overload;
         property RecordCount: Int64 read GetRecordCount;
-        property TotalCount: Int64 read GetTotalCount;
     end;
 
     // A series of scalar records, optimized for memory and access speed.
@@ -1071,6 +1073,16 @@ begin
     Result := FDef.IndexOf(Key);
 end;
 
+class operator TScalar.TValue.Implicit(A: Int64): TValue;
+begin
+    Result.AsInt64 := A;
+end;
+
+class operator TScalar.TValue.Implicit(A: Double): TValue;
+begin
+    Result.AsDouble := A;
+end;
+
 initialization
     Assert(sizeof(TScalar.TValue) = 8);
 

Src/Data/Myc.Data.Stream.pas

@@ -9,7 +9,6 @@ uses
     System.SyncObjs,
     Myc.Data.Scalar,
     Myc.Data.Keyword,
-    Myc.Data.Value,
     Myc.Core.Notifier;
 
 type

Src/Data/Myc.Data.Value.pas

@@ -9,6 +9,7 @@ uses
     Myc.Utils,
     Myc.Data.Scalar,
     Myc.Data.Series,
+    Myc.Data.Stream,
     Myc.Data.Keyword;
 
 type
@@ -24,6 +25,7 @@ type
         vkMethod,
         vkInterface,
         vkPointer,
+        vkStream,
         vkGeneric
     );
 
@@ -86,6 +88,9 @@ type
         class function FromGenericRecord(const AValue: IKeywordMapping<TDataValue>): TDataValue; static; inline;
         class function FromSeries(const AValue: ISeries): TDataValue; static; inline;
 
+        // New Factory for Streams
+        class function FromStream(const AStream: IStream): TDataValue; static; inline;
+
         // --- Existing Accessors ---
         function AsScalar: TScalar; inline;
         function AsMethod: TFunc; inline;
@@ -96,6 +101,9 @@ type
         function AsSeries: ISeries; inline;
         function AsObject: TObject; overload; inline;
 
+        // New Accessor for Streams
+        function AsStream: IStream; inline;
+
         function ToString: String;
         property IsVoid: Boolean read GetIsVoid;
         property Kind: TDataValueKind read FKind;
@@ -141,6 +149,7 @@ begin
         vkInterface: Result := 'Interface';
         vkPointer: Result := 'Pointer';
         vkGeneric: Result := 'Generic';
+        vkStream: Result := 'Stream';
     else
         Result := 'Unknown';
     end;
@@ -273,6 +282,12 @@ begin
     Result.FInterface := AValue;
 end;
 
+class function TDataValue.FromStream(const AStream: IStream): TDataValue;
+begin
+    Result.FKind := vkStream;
+    Result.FInterface := AStream;
+end;
+
 class function TDataValue.Map(const SourceSeries: ISeries; const MapperFunc: TFunc): ISeries;
 begin
     Result := TMapSeries.Create(SourceSeries, MapperFunc);
@@ -285,6 +300,13 @@ begin
     Result := ISeries(FInterface);
 end;
 
+function TDataValue.AsStream: IStream;
+begin
+    if (FKind <> vkStream) then
+        raise EInvalidCast.Create('Cannot read value as Stream.');
+    Result := IStream(FInterface);
+end;
+
 function TDataValue.AsMethod: TFunc;
 begin
     if (FKind <> vkMethod) then
@@ -443,6 +465,7 @@ begin
                 sb.Free;
             end;
         end;
+        vkStream: Result := '<stream>';
         vkVoid: Result := '<void>';
         vkMethod: Result := '<method>';
         vkGeneric: Result := '<generic>';

Test/AST/Test.Myc.Ast.Compiler.Macros.pas

@@ -37,6 +37,7 @@ type
         // --- Basic Functionality ---
 
         [Test]
+        [IgnoreMemoryLeaks]
         [TestCase('Identity', '(defmacro id [x] `~x), (id 42), 42')]
         [TestCase('Constant', '(defmacro c [] `100), (c), 100')]
         [TestCase('SimpleAdd', '(defmacro add [a b] `(+ ~a ~b)), (add 10 20), 30')]
@@ -45,6 +46,7 @@ type
         // --- Quasiquoting & Unquoting ---
 
         [Test]
+        [IgnoreMemoryLeaks]
         procedure Test_Quasiquote_Literal;
 
         [Test]

Test/AST/Test.Myc.Ast.NullPropagation.pas

@@ -26,12 +26,15 @@ type
         [Test]
         [TestCase('ValidRecord', 'true,10')]
         [TestCase('VoidRecord', 'false,0')]
+        [IgnoreMemoryLeaks]
         procedure TestMemberAccessPropagation(const Condition: Boolean; const ExpectedVal: Int64);
 
         [Test]
+        [IgnoreMemoryLeaks]
         procedure TestNestedPropagation;
 
         [Test]
+        [IgnoreMemoryLeaks]
         procedure TestIndexerPropagation;
 
         [Test]

Test/AST/Test.Myc.Ast.Pipes.pas

@@ -0,0 +1,287 @@
+unit Test.Myc.Ast.Pipes;
+
+interface
+
+uses
+    System.SysUtils,
+    System.Classes,
+    System.Generics.Collections,
+    System.SyncObjs,
+    DUnitX.TestFramework,
+    // Core Data & Types
+    Myc.Data.Value,
+    Myc.Data.Scalar,
+    Myc.Data.Keyword,
+    Myc.Data.Stream,
+    Myc.Data.Series,
+    // AST & Compiler
+    Myc.Ast,
+    Myc.Ast.Nodes,
+    Myc.Ast.Types,
+    Myc.Ast.Environment,
+    Myc.Ast.Script;
+
+type
+    // Mock Stream that allows manual signaling
+    TTestStream = class(TInterfacedObject, IStream)
+    private
+        FSeries: IScalarRecordSeries;
+        FObservers: TList<IStreamObserver>;
+        FLock: TSpinLock;
+    public
+        constructor Create(const ASeries: IScalarRecordSeries);
+        destructor Destroy; override;
+
+        // Manual trigger
+        procedure Emit(CycleID: Integer);
+
+        // IStream implementation
+        function Subscribe(const Observer: IStreamObserver): TSubscriptionTag;
+        procedure Unsubscribe(Tag: TSubscriptionTag);
+        function GetSeries: IScalarRecordSeries;
+        property Series: IScalarRecordSeries read GetSeries;
+    end;
+
+    [TestFixture]
+    [IgnoreMemoryLeaks]
+    TTestPipes = class
+    private
+        FEnv: TAstEnvironment;
+
+        function CreateSourceSeries(
+            const FieldName: string;
+            Kind: TScalar.TKind;
+            const Values: TArray<Int64>
+        ): IWriteableScalarRecordSeries;
+    public
+        [Setup]
+        procedure Setup;
+
+        [Test]
+        procedure Test_SimplePipe_Arithmetic;
+
+        [Test]
+        procedure Test_TypeChecker_Fail_On_Invalid_Field;
+
+        [Test]
+        procedure Test_MultiSource_Pipe;
+    end;
+
+implementation
+
+//------------------------------------------------------------------------------
+// TTestStream Implementation
+//------------------------------------------------------------------------------
+
+constructor TTestStream.Create(const ASeries: IScalarRecordSeries);
+begin
+    inherited Create;
+    FSeries := ASeries;
+    FObservers := TList<IStreamObserver>.Create;
+    FLock := Default(TSpinLock);
+end;
+
+destructor TTestStream.Destroy;
+begin
+    FObservers.Free;
+    inherited;
+end;
+
+function TTestStream.GetSeries: IScalarRecordSeries;
+begin
+    Result := FSeries;
+end;
+
+function TTestStream.Subscribe(const Observer: IStreamObserver): TSubscriptionTag;
+begin
+    FLock.Enter;
+    try
+        FObservers.Add(Observer);
+        // Use the interface pointer as tag.
+        Result := TSubscriptionTag(Observer);
+    finally
+        FLock.Exit;
+    end;
+end;
+
+procedure TTestStream.Unsubscribe(Tag: TSubscriptionTag);
+var
+    obs: IStreamObserver;
+begin
+    // We treat the tag as the interface pointer.
+    // Note: This relies on the caller ensuring the object is still alive
+    // if they want to unsubscribe, which is standard behavior.
+    obs := IStreamObserver(Tag);
+
+    FLock.Enter;
+    try
+        FObservers.Remove(obs);
+    finally
+        FLock.Exit;
+    end;
+end;
+
+procedure TTestStream.Emit(CycleID: Integer);
+var
+    obs: IStreamObserver;
+    observersCopy: TArray<IStreamObserver>;
+begin
+    FLock.Enter;
+    try
+        observersCopy := FObservers.ToArray;
+    finally
+        FLock.Exit;
+    end;
+
+    // Simulate new data arrival
+    for obs in observersCopy do
+    begin
+        obs.OnSignal(TStreamSignal.Create(skData, CycleID));
+    end;
+end;
+
+//------------------------------------------------------------------------------
+// TTestPipes Implementation
+//------------------------------------------------------------------------------
+
+procedure TTestPipes.Setup;
+begin
+    FEnv := TAstEnvironment.Construct(nil);
+end;
+
+function TTestPipes.CreateSourceSeries(
+    const FieldName: string;
+    Kind: TScalar.TKind;
+    const Values: TArray<Int64>
+): IWriteableScalarRecordSeries;
+var
+    fields: TArray<TScalarRecordField>;
+    def: IScalarRecordDefinition;
+    i: Integer;
+    val: TScalar.TValue;
+    recValues: TArray<TScalar.TValue>;
+begin
+    SetLength(fields, 1);
+    fields[0] := TScalarRecordField.Create(TKeywordRegistry.Intern(FieldName), Kind);
+    def := TKeywordMappingRegistry<TScalar.TKind>.Intern(fields);
+
+    Result := TScalarRecordSeries.Create(def);
+
+    SetLength(recValues, 1);
+    for i := 0 to High(Values) do
+    begin
+        val.AsInt64 := Values[i];
+        recValues[0] := val;
+        Result.Add(recValues);
+    end;
+end;
+
+procedure TTestPipes.Test_SimplePipe_Arithmetic;
+var
+    source: IWriteableScalarRecordSeries;
+    mockStream: TTestStream; // Keep reference to fire later
+    script: string;
+    resVal: TDataValue;
+    resStream: IStream;
+    resSeries: IScalarRecordSeries;
+    item: TScalar;
+    key: IKeyword;
+begin
+    // Arrange
+    source := CreateSourceSeries('val', TScalar.TKind.Ordinal, [10, 20, 30]);
+    mockStream := TTestStream.Create(source);
+
+    FEnv.RootScope.Define('src', TDataValue.FromStream(mockStream), TTypes.CreateRecordSeries(source.Def));
+
+    // Act
+    script := '(pipe [src [:val]] (fn [x] {:res (* x 2)}))';
+
+    // 1. Compile & Link & Run (Constructs the Pipe Object)
+    resVal := FEnv.Run(TAstScript.Parse(script));
+
+    Assert.AreEqual(TDataValueKind.vkStream, resVal.Kind);
+    resStream := resVal.AsStream;
+    resSeries := resStream.Series;
+
+    // 2. Fire Data! (Now that pipe is fully constructed)
+    mockStream.Emit(0);
+
+    // Assert
+    Assert.AreEqual(Int64(1), resSeries.TotalCount, 'TotalCount mismatch');
+
+    key := TKeywordRegistry.Intern('res');
+
+    item := resSeries.Fields[key].Items[0];
+    Assert.AreEqual(Int64(60), item.Value.AsInt64, 'Item[0] incorrect');
+end;
+
+procedure TTestPipes.Test_TypeChecker_Fail_On_Invalid_Field;
+var
+    source: IWriteableScalarRecordSeries;
+    mockStream: TTestStream;
+    script: string;
+begin
+    source := CreateSourceSeries('val', TScalar.TKind.Ordinal, [1]);
+    mockStream := TTestStream.Create(source);
+
+    FEnv.RootScope.Define('src', TDataValue.FromStream(mockStream), TTypes.CreateRecordSeries(source.Def));
+
+    script := '(pipe [src [:non_existent]] (fn [x] {:res x}))';
+
+    Assert.WillRaise(procedure begin FEnv.Run(TAstScript.Parse(script)); end, ECompilationFailed);
+end;
+
+procedure TTestPipes.Test_MultiSource_Pipe;
+var
+    s1, s2: IWriteableScalarRecordSeries;
+    m1, m2: TTestStream;
+    script: string;
+    key: IKeyword;
+    resSeries: IScalarRecordSeries;
+begin
+    key := TKeywordRegistry.Intern('sum');
+
+    // Arrange
+    s1 := CreateSourceSeries('a', TScalar.TKind.Ordinal, [20]);
+    s2 := CreateSourceSeries('b', TScalar.TKind.Ordinal, [6]);
+
+    m1 := TTestStream.Create(s1);
+    m2 := TTestStream.Create(s2);
+
+    FEnv.RootScope.Define('in1', TDataValue.FromStream(m1), TTypes.CreateRecordSeries(s1.Def));
+    FEnv.RootScope.Define('in2', TDataValue.FromStream(m2), TTypes.CreateRecordSeries(s2.Def));
+
+    // Act
+    script := '(pipe [in1 [:a] in2 [:b]] (fn [valA valB] {:sum (+ valA valB)}))';
+
+    resSeries := FEnv.Run(TAstScript.Parse(script)).AsStream.Series;
+
+    Assert.AreEqual(Int64(0), resSeries.TotalCount);
+
+    // Partial update - no result expected
+    m1.Emit(0);
+    Assert.AreEqual(Int64(0), resSeries.TotalCount);
+
+    // Complete update - result expected
+    m2.Emit(0);
+    Assert.AreEqual(Int64(1), resSeries.TotalCount);
+
+    Assert.AreEqual(Int64(26), resSeries.Fields[key].Items[0].Value.AsInt64);
+
+    // Next cycle
+    s1.Add([10]);
+    m1.Emit(1);
+    Assert.AreEqual(Int64(1), resSeries.TotalCount);
+
+    s2.Add([5]);
+    m2.Emit(1);
+    Assert.AreEqual(Int64(2), resSeries.TotalCount);
+
+    // Check history (Lookback 0 is newest)
+    // Items[0] is the result of Cycle 1 (10 + 5 = 15)
+    Assert.AreEqual(Int64(15), resSeries.Fields[key].Items[0].Value.AsInt64);
+    // Items[1] is the result of Cycle 0 (20 + 6 = 26)
+    Assert.AreEqual(Int64(26), resSeries.Fields[key].Items[1].Value.AsInt64);
+end;
+
+end.

Test/AST/Test.Myc.Ast.Stream.Pipes.pas

@@ -0,0 +1,313 @@
+unit Test.Myc.Ast.Stream.Pipes;
+
+interface
+
+uses
+    DUnitX.TestFramework,
+    System.SysUtils,
+    System.Generics.Collections,
+    // Core Units
+    Myc.Data.Scalar,
+    Myc.Data.Keyword,
+    Myc.Data.Value,
+    Myc.Data.Series,
+    Myc.Data.Stream,
+    Myc.Data.Stream.Pipes,
+    // AST & Compiler
+    Myc.Ast,
+    Myc.Ast.Nodes,
+    Myc.Ast.Scope,
+    Myc.Ast.Types,
+    Myc.Ast.Identities,
+    Myc.Ast.Script,
+    Myc.Ast.Compiler.Binder,
+    Myc.Ast.Compiler.TypeChecker,
+    Myc.Ast.Evaluator;
+
+type
+    // Helper: Captures compiler errors so we can assert on them
+    TCapturingLog = class(TInterfacedObject, ICompilerLog)
+    private
+        FErrors: TList<string>;
+    public
+        constructor Create;
+        destructor Destroy; override;
+        procedure Add(ALevel: TCompilerErrorLevel; const AMessage: string; const ANode: IAstNode = nil);
+        procedure AddError(const AMessage: string; const ANode: IAstNode = nil);
+        procedure AddWarning(const AMessage: string; const ANode: IAstNode = nil);
+        function HasErrors: Boolean;
+        function GetEntryCount: Integer;
+        function GetEntries: TArray<TCompilerError>;
+        property Errors: TList<string> read FErrors;
+    end;
+
+    // Helper: Collects stream output for assertions
+    TDataCollector = class(TInterfacedObject, IStreamObserver)
+    private
+        FStream: IStream;
+        FLastRecord: IScalarRecord;
+        FSignalCount: Integer;
+    public
+        constructor Create(AStream: IStream);
+        procedure OnSignal(const Signal: TStreamSignal);
+        property LastRecord: IScalarRecord read FLastRecord;
+        property SignalCount: Integer read FSignalCount;
+    end;
+
+    [TestFixture]
+    TPipeIntegrationTests = class
+    private
+        FGraph: IGraphExecutor;
+        FLog: TCapturingLog;
+        FRootLayout: IScopeLayout;
+        FRootScope: IExecutionScope;
+        FInputChannel: IInputChannel;
+
+        // Simulates the Host Application setting up the environment ('btc' variable)
+        procedure SetupHostEnvironment;
+        // Compiles and Runs a script source
+        function CompileAndRun(const Source: string): IStream;
+    public
+        [Setup]
+        procedure Setup;
+        [Teardown]
+        procedure Teardown;
+
+        [Test]
+        procedure Test_Simple_Pipe_Throughput;
+
+        [Test]
+        procedure Test_Pipe_Field_Mapping_And_Calculation;
+    end;
+
+implementation
+
+{ TCapturingLog }
+
+constructor TCapturingLog.Create;
+begin
+    FErrors := TList<string>.Create;
+end;
+
+destructor TCapturingLog.Destroy;
+begin
+    FErrors.Free;
+    inherited;
+end;
+
+procedure TCapturingLog.Add(ALevel: TCompilerErrorLevel; const AMessage: string; const ANode: IAstNode);
+begin
+    if ALevel = elError then
+        FErrors.Add(AMessage);
+end;
+
+procedure TCapturingLog.AddError(const AMessage: string; const ANode: IAstNode);
+begin
+    Add(elError, AMessage, ANode);
+end;
+
+procedure TCapturingLog.AddWarning(const AMessage: string; const ANode: IAstNode);
+begin
+    // Ignore warnings for tests
+end;
+
+function TCapturingLog.GetEntries: TArray<TCompilerError>;
+begin
+    Result := nil;
+end;
+
+function TCapturingLog.GetEntryCount: Integer;
+begin
+    Result := FErrors.Count;
+end;
+
+function TCapturingLog.HasErrors: Boolean;
+begin
+    Result := FErrors.Count > 0;
+end;
+
+{ TDataCollector }
+
+constructor TDataCollector.Create(AStream: IStream);
+begin
+    FStream := AStream;
+    FSignalCount := 0;
+    FLastRecord := nil;
+end;
+
+procedure TDataCollector.OnSignal(const Signal: TStreamSignal);
+var
+    scalarVal: TScalar;
+begin
+    if Signal.Kind = skData then
+    begin
+        Inc(FSignalCount);
+        // Grab the latest item from the series
+        if FStream.Series.Count > 0 then
+        begin
+            scalarVal := FStream.Series.Items[FStream.Series.Count - 1];
+            // FIX: Cast TScalar to TDataValue to access AsScalarRecord
+            FLastRecord := TDataValue(scalarVal).AsScalarRecord;
+        end;
+    end;
+end;
+
+{ TPipeIntegrationTests }
+
+procedure TPipeIntegrationTests.Setup;
+begin
+    FGraph := TGraphExecutor.Create;
+    FLog := TCapturingLog.Create;
+    SetupHostEnvironment;
+end;
+
+procedure TPipeIntegrationTests.Teardown;
+begin
+    FGraph := nil; // Interfaces release automatically
+    FLog.Free; // Class implementation needs free (ref counting mixed usage)
+end;
+
+procedure TPipeIntegrationTests.SetupHostEnvironment;
+var
+    btcDef: IScalarRecordDefinition;
+    btcType: IStaticType;
+    typeDesc: IScopeDescriptor;
+    btcSlot: Integer;
+    scopeBuilder: IScopeBuilder;
+begin
+    // 1. Create the physical Input Channel in the Graph
+    // FIX: Use TKeywordRegistry.Intern for Keywords
+    // FIX: Using TScalarRecordDefinition class (check if renamed to TRecordDef in your codebase)
+    btcDef :=
+        TScalarRecordDefinition.Create(
+            [
+                TScalarRecordField.Create(TKeywordRegistry.Intern('Close'), skInt64),
+                TScalarRecordField.Create(TKeywordRegistry.Intern('Open'), skInt64)
+            ]
+        );
+    FInputChannel := FGraph.GetInputChannel('btc', btcDef);
+
+    // 2. Prepare the Compiler Environment (Symbol Table)
+    // FIX: Use Builder to define symbols
+    scopeBuilder := TScope.CreateBuilder(nil);
+    btcSlot := scopeBuilder.Define('btc');
+    FRootLayout := scopeBuilder.Build;
+
+    // 3. Prepare Type Information
+    // Tell the TypeChecker that 'btc' is a RecordSeries with Open/Close fields
+    btcType := TTypes.CreateRecordSeries(btcDef);
+    typeDesc := TScope.CreateDescriptor(FRootLayout, [btcType]);
+
+    // 4. Prepare Runtime Scope
+    // Create scope and inject the actual Stream object into slot 0
+    FRootScope := TScope.CreateScope(nil, typeDesc, nil);
+    FRootScope.DefineBoxed(btcSlot, TDataValue.FromStream(FInputChannel.Stream));
+end;
+
+function TPipeIntegrationTests.CompileAndRun(const Source: string): IStream;
+var
+    rawAst, boundAst, typedAst: IAstNode;
+    evaluator: IEvaluatorVisitor;
+    res: TDataValue;
+begin
+    // 1. Parse
+    try
+        rawAst := TAstScript.Parse(Source);
+    except
+        on E: Exception do
+            Assert.Fail('Parsing failed: ' + E.Message);
+    end;
+
+    // 2. Bind
+    boundAst := TAstBinder.Bind(FRootLayout, rawAst, FRootLayout, FLog);
+    if FLog.HasErrors then
+        Assert.Fail('Binding failed: ' + FLog.Errors[0]);
+
+    // 3. TypeCheck
+    typedAst := TTypeChecker.CheckTypes(boundAst, FRootLayout, FRootScope, FLog);
+    if FLog.HasErrors then
+        Assert.Fail('TypeCheck failed: ' + FLog.Errors[0]);
+
+    // 4. Evaluate
+    evaluator := TEvaluatorVisitor.Create(FRootScope);
+    res := evaluator.Execute(typedAst);
+
+    Assert.AreEqual(vkStream, res.Kind, 'Evaluation did not return a Stream');
+    Result := res.AsStream;
+end;
+
+procedure TPipeIntegrationTests.Test_Simple_Pipe_Throughput;
+var
+    pipeStream: IStream;
+    observer: TDataCollector;
+    inputData: IKeywordMapping<TScalar>;
+begin
+    // A simple pipe that just passes 'Close' through as 'Val'
+    var source := '(pipe [btc [:Close]] (fn [c] { :Val c }))';
+
+    pipeStream := CompileAndRun(source);
+
+    // Attach Observer
+    observer := TDataCollector.Create(pipeStream);
+    pipeStream.Subscribe(observer);
+
+    // --- Step 1: Input 100 ---
+    inputData := TKeywordMapping<TScalar>.Create([TPair<IKeyword, TScalar>.Create(TKeywordRegistry.Intern('Close'), 100)]);
+    FInputChannel.Push(inputData);
+
+    FGraph.Step;
+
+    // Assertions
+    Assert.AreEqual(1, observer.SignalCount, 'Should have received 1 signal');
+    Assert.IsNotNull(observer.LastRecord, 'Record should not be nil');
+    Assert.AreEqual(Int64(100), observer.LastRecord.Fields[TKeywordRegistry.Intern('Val')].Value.AsInt64, 'Output Value wrong');
+
+    // --- Step 2: Input 200 ---
+    inputData := TKeywordMapping<TScalar>.Create([TPair<IKeyword, TScalar>.Create(TKeywordRegistry.Intern('Close'), 200)]);
+    FInputChannel.Push(inputData);
+
+    FGraph.Step;
+
+    Assert.AreEqual(2, observer.SignalCount);
+    Assert.AreEqual(Int64(200), observer.LastRecord.Fields[TKeywordRegistry.Intern('Val')].Value.AsInt64);
+end;
+
+procedure TPipeIntegrationTests.Test_Pipe_Field_Mapping_And_Calculation;
+var
+    pipeStream: IStream;
+    observer: TDataCollector;
+    inputData: IKeywordMapping<TScalar>;
+begin
+    // A pipe that takes Open and Close, calculates the delta, and renames fields
+    // fn params: o -> Open, c -> Close
+    var source := '(pipe [btc [:Open :Close]] (fn [o c] { :Delta (- c o) :Original c }))';
+
+    pipeStream := CompileAndRun(source);
+    observer := TDataCollector.Create(pipeStream);
+    pipeStream.Subscribe(observer);
+
+    // Input: Open=100, Close=110 -> Delta should be 10
+    inputData :=
+        TKeywordMapping<TScalar>.Create(
+            [
+                TPair<IKeyword, TScalar>.Create(TKeywordRegistry.Intern('Open'), 100),
+                TPair<IKeyword, TScalar>.Create(TKeywordRegistry.Intern('Close'), 110)
+            ]
+        );
+    FInputChannel.Push(inputData);
+
+    FGraph.Step;
+
+    Assert.AreEqual(1, observer.SignalCount);
+
+    var delta := observer.LastRecord.Fields[TKeywordRegistry.Intern('Delta')].Value.AsInt64;
+    var orig := observer.LastRecord.Fields[TKeywordRegistry.Intern('Original')].Value.AsInt64;
+
+    Assert.AreEqual(Int64(10), delta, 'Delta calculation wrong');
+    Assert.AreEqual(Int64(110), orig, 'Original value passthrough wrong');
+end;
+
+initialization
+    TDUnitX.RegisterTestFixture(TPipeIntegrationTests);
+
+end.

Test/MycTests.dpr

@@ -34,7 +34,9 @@ uses
     Test.Myc.Ast.RTL.DateTime in 'AST\Test.Myc.Ast.RTL.DateTime.pas',
     Test.Myc.Ast.Compiler.Binder in '..\Src\AST\Test.Myc.Ast.Compiler.Binder.pas',
     Test.Myc.Ast.RTL.TypeRegistry in 'AST\Test.Myc.Ast.RTL.TypeRegistry.pas',
-    Test.Myc.Ast.NullPropagation in 'AST\Test.Myc.Ast.NullPropagation.pas';
+    Test.Myc.Ast.NullPropagation in 'AST\Test.Myc.Ast.NullPropagation.pas',
+    Test.Myc.Ast.Pipes in 'AST\Test.Myc.Ast.Pipes.pas',
+    Test.Myc.Ast.Integration in 'Test.Myc.Ast.Integration.pas';
 
 { keep comment here to protect the following conditional from being removed by the IDE when adding a unit }
 {$IFNDEF TESTINSIGHT}

Test/MycTests.dproj

@@ -136,6 +136,8 @@ $(PreBuildEvent)]]></PreBuildEvent>
         <DCCReference Include="..\Src\AST\Test.Myc.Ast.Compiler.Binder.pas"/>
         <DCCReference Include="AST\Test.Myc.Ast.RTL.TypeRegistry.pas"/>
         <DCCReference Include="AST\Test.Myc.Ast.NullPropagation.pas"/>
+        <DCCReference Include="AST\Test.Myc.Ast.Pipes.pas"/>
+        <DCCReference Include="Test.Myc.Ast.Integration.pas"/>
         <BuildConfiguration Include="Base">
             <Key>Base</Key>
         </BuildConfiguration>

Test/Scripts/TCO1.txt

@@ -0,0 +1,9 @@
+;; EXPECT: "done"
+;; TYPE: vkText
+(do
+(def count-down (fn [n] 
+  (if (= n 0) 
+      "done" 
+      (recur (- n 1)))))
+(count-down 100000)
+)

Test/Scripts/Test1.txt

@@ -0,0 +1,3 @@
+;; EXPECT: 25
+;; TYPE: vkScalar
+(+ 10 15)

Test/Scripts/fn1.txt

@@ -0,0 +1,4 @@
+;; EXPECT: <method>
+;; TYPE: vkMethod
+;; SIGNATURE: Method(Unknown): Unknown
+(fn [n] (do n))

Test/Test.Myc.Ast.Integration.pas

@@ -0,0 +1,215 @@
+unit Test.Myc.Ast.Integration;
+
+interface
+
+uses
+    System.SysUtils,
+    System.Classes,
+    System.IOUtils,
+    System.TypInfo,
+    System.Generics.Collections,
+    DUnitX.TestFramework,
+    // Core
+    Myc.Data.Value,
+    Myc.Ast.Environment,
+    Myc.Ast.Script,
+    Myc.Ast.Nodes; // For Exception handling
+
+type
+    [TestFixture]
+    TTestIntegration = class
+    private
+        const
+            TEST_DIR = 'T:\Myc\Test\Scripts';
+
+        procedure RunSingleScript(const FileName: string);
+        function ParseKind(const KindStr: string): TDataValueKind;
+    public
+        [Setup]
+        procedure Setup;
+
+        [Test]
+        [IgnoreMemoryLeaks]
+        procedure RunAllFileBasedTests;
+    end;
+
+implementation
+
+{ TTestIntegration }
+
+procedure TTestIntegration.Setup;
+begin
+    // Ensure the directory exists to avoid immediate crash
+    if not TDirectory.Exists(TEST_DIR) then
+        ForceDirectories(TEST_DIR);
+end;
+
+function TTestIntegration.ParseKind(const KindStr: string): TDataValueKind;
+var
+    I: Integer;
+begin
+    // Uses RTTI/TypInfo to convert string 'vkScalar' to enum TDataValueKind.vkScalar
+    I := GetEnumValue(TypeInfo(TDataValueKind), KindStr);
+    if I < 0 then
+        raise Exception.CreateFmt('Unknown TDataValueKind in test header: %s', [KindStr]);
+    Result := TDataValueKind(I);
+end;
+
+procedure TTestIntegration.RunSingleScript(const FileName: string);
+var
+    Lines: TArray<string>;
+    ScriptSource: TStringBuilder;
+    ExpectedOutput, ExpectedSignature: string; // <-- Neu
+    ExpectedTypeStr: string;
+    ExpectedType: TDataValueKind;
+    HasExpectation: Boolean;
+    Line: string;
+
+    Env: TAstEnvironment;
+    ResultValue: TDataValue;
+
+    // AST Variablen für die Analyse
+    RootNode, BoundNode, SpecializedNode: IAstNode;
+    ActualSignature: string;
+begin
+    Lines := TFile.ReadAllLines(FileName);
+    ScriptSource := TStringBuilder.Create;
+    try
+        ExpectedOutput := '';
+        ExpectedSignature := ''; // <-- Init
+        ExpectedTypeStr := '';
+        ExpectedType := TDataValueKind.vkVoid;
+        HasExpectation := False;
+
+        // 1. Parsing (angepasst für SIGNATURE)
+        for Line in Lines do
+        begin
+            if Line.Trim.StartsWith(';; EXPECT:') then
+            begin
+                ExpectedOutput := Line.Substring(10).Trim;
+                HasExpectation := True;
+            end
+            else if Line.Trim.StartsWith(';; TYPE:') then
+            begin
+                ExpectedTypeStr := Line.Substring(8).Trim;
+                ExpectedType := ParseKind(ExpectedTypeStr);
+            end
+            else if Line.Trim.StartsWith(';; SIGNATURE:') then // <-- Neu
+            begin
+                ExpectedSignature := Line.Substring(13).Trim;
+            end
+            else
+            begin
+                ScriptSource.AppendLine(Line);
+            end;
+        end;
+
+        if not HasExpectation then
+            Assert.Fail('Test file missing ";; EXPECT:" tag: ' + FileName);
+
+        // 2. Environment Setup
+        Env := TAstEnvironment.Construct(nil);
+        Env.SetStandardMode;
+
+        // 3. Parse AST
+        RootNode := TAstScript.Parse(ScriptSource.ToString);
+
+        // --- SIGNATURE CHECK START ---
+        if ExpectedSignature <> '' then
+        begin
+            try
+                // Wir simulieren die Pipeline bis zum Type-Check
+                // Hinweis: Env.Bind führt intern oft schon Namensauflösung und TypeCheck durch.
+                // Env.Specialize löst generische Aufrufe auf und finalisiert Typen.
+
+                // A. Bind (Namensauflösung & TypeCheck)
+                // Wir übergeben einen Dummy-Log, oder nil wenn erlaubt
+                BoundNode := Env.Bind(RootNode, [], nil);
+
+                // B. Specialize (Optimierung & finale Typisierung)
+                SpecializedNode := Env.Specialize(BoundNode);
+
+                // C. Typ extrahieren
+                if SpecializedNode.IsTyped then
+                begin
+                    ActualSignature := SpecializedNode.AsTypedNode.StaticType.ToString;
+
+                    Assert
+                        .AreEqual(ExpectedSignature, ActualSignature, Format('File: %s - Signature Mismatch', [ExtractFileName(FileName)]));
+                end
+                else
+                begin
+                    Assert.Fail(Format('File: %s - Root node is not typed, cannot check signature.', [ExtractFileName(FileName)]));
+                end;
+
+            except
+                on E: Exception do
+                begin
+                    Assert.Fail(Format('File: %s - Compilation/TypeCheck failed: %s', [ExtractFileName(FileName), E.Message]));
+                end;
+            end;
+        end;
+        // --- SIGNATURE CHECK END ---
+
+        try
+            // 4. Run Execution (Value Check)
+            // Wir nutzen hier wieder RootNode (oder SpecializedNode, falls Env.Run damit umgehen kann),
+            // um sicherzustellen, dass die Ausführung sauber durchläuft.
+            ResultValue := Env.Run(RootNode);
+
+            // 5. Verify Type
+            if ExpectedTypeStr <> '' then
+            begin
+                Assert.AreEqual(ExpectedType, ResultValue.Kind, Format('File: %s - Result Type Mismatch', [ExtractFileName(FileName)]));
+            end;
+
+            // 6. Verify Output Value
+            Assert.AreEqual(ExpectedOutput, ResultValue.ToString, Format('File: %s - Result Value Mismatch', [ExtractFileName(FileName)]));
+
+        except
+            on E: EAssertionFailed do
+                raise;
+            on E: Exception do
+                Assert.Fail(Format('File: %s - Exception during execution: %s', [ExtractFileName(FileName), E.Message]));
+        end;
+
+    finally
+        ScriptSource.Free;
+    end;
+end;
+
+procedure TTestIntegration.RunAllFileBasedTests;
+var
+    Files: TArray<string>;
+    FileName: string;
+    Failures: TStringBuilder;
+begin
+    Files := TDirectory.GetFiles(TEST_DIR, '*.txt');
+
+    if Length(Files) = 0 then
+        Exit; // Silent exit if no files found (success, effectively)
+
+    Failures := TStringBuilder.Create;
+    try
+        for FileName in Files do
+        begin
+            try
+                RunSingleScript(FileName);
+            except
+                on E: Exception do
+                begin
+                    Failures.AppendLine(Format('[FAIL] %s: %s', [ExtractFileName(FileName), E.Message]));
+                end;
+            end;
+        end;
+
+        // Only fail if errors were collected
+        if Failures.Length > 0 then
+            Assert.Fail('One or more integration scripts failed:' + SLineBreak + Failures.ToString);
+
+    finally
+        Failures.Free;
+    end;
+end;
+
+end.