Michael Schimmel
741 lines
26 KiB
ObjectPascal
741 lines
26 KiB
ObjectPascal
unit Myc.Ast.Compiler.TypeChecker;
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interface
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uses
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System.SysUtils,
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System.Classes,
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System.Generics.Collections,
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Myc.Data.Scalar,
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Myc.Data.Value,
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Myc.Ast.Nodes,
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Myc.Ast.Visitor,
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Myc.Ast.Scope,
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Myc.Ast.Types,
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Myc.Ast;
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type
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IAstTypeChecker = interface(IAstVisitor)
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function Execute(const RootNode: IAstNode; const Layout: IScopeLayout): IAstNode;
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end;
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TTypeChecker = class(TAstTransformer, IAstTypeChecker)
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private
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type
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// Helper to track types per scope during traversal (The "Scratchpad")
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TTypeContext = class
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private
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FParent: TTypeContext;
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FLayout: IScopeLayout;
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FSlotTypes: TArray<IStaticType>;
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FUpvalueTypes: TArray<IStaticType>; // Types of captured variables
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public
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constructor Create(AParent: TTypeContext; ALayout: IScopeLayout; const AUpvalueTypes: TArray<IStaticType>);
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function LookupType(const Address: TResolvedAddress): IStaticType;
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procedure SetType(SlotIndex: Integer; AType: IStaticType);
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property Types: TArray<IStaticType> read FSlotTypes;
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end;
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private
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FCurrentContext: TTypeContext;
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// Helper to recursively rebuild the context stack from the layout hierarchy
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function CreateContextChain(L: IScopeLayout): TTypeContext;
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protected
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// Override all visit methods to perform type checking
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function VisitIdentifier(const Node: IIdentifierNode): IAstNode; override;
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function VisitVariableDeclaration(const Node: IVariableDeclarationNode): IAstNode; override;
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function VisitAssignment(const Node: IAssignmentNode): IAstNode; override;
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function VisitLambdaExpression(const Node: ILambdaExpressionNode): IAstNode; override;
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function VisitFunctionCall(const Node: IFunctionCallNode): IAstNode; override;
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function VisitBlockExpression(const Node: IBlockExpressionNode): IAstNode; override;
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function VisitIfExpression(const Node: IIfExpressionNode): IAstNode; override;
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function VisitTernaryExpression(const Node: ITernaryExpressionNode): IAstNode; override;
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function VisitMemberAccess(const Node: IMemberAccessNode): IAstNode; override;
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function VisitIndexer(const Node: IIndexerNode): IAstNode; override;
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function VisitRecordLiteral(const Node: IRecordLiteralNode): IAstNode; override;
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function VisitCreateSeries(const Node: ICreateSeriesNode): IAstNode; override;
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function VisitAddSeriesItem(const Node: IAddSeriesItemNode): IAstNode; override;
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function VisitSeriesLength(const Node: ISeriesLengthNode): IAstNode; override;
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function VisitRecurNode(const Node: IRecurNode): IAstNode; override;
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function VisitNop(const Node: INopNode): IAstNode; override;
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// Base cases (types are now set here)
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function VisitConstant(const Node: IConstantNode): IAstNode; override;
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function VisitKeyword(const Node: IKeywordNode): IAstNode; override;
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public
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constructor Create(const RootLayout: IScopeLayout);
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destructor Destroy; override;
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function Execute(const RootNode: IAstNode; const Layout: IScopeLayout): IAstNode;
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class function CheckTypes(const RootNode: IAstNode; const Layout: IScopeLayout): IAstNode; static;
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end;
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implementation
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uses
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System.Generics.Defaults,
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Myc.Data.Keyword;
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{ TTypeChecker.TTypeContext }
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constructor TTypeChecker.TTypeContext.Create(AParent: TTypeContext; ALayout: IScopeLayout; const AUpvalueTypes: TArray<IStaticType>);
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begin
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inherited Create;
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FParent := AParent;
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FLayout := ALayout;
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FUpvalueTypes := AUpvalueTypes;
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// Initialize slot types with Unknown
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if Assigned(FLayout) then
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begin
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SetLength(FSlotTypes, FLayout.SlotCount);
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for var i := 0 to High(FSlotTypes) do
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FSlotTypes[i] := TTypes.Unknown;
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end;
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end;
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function TTypeChecker.TTypeContext.LookupType(const Address: TResolvedAddress): IStaticType;
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var
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ctx: TTypeContext;
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i: Integer;
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begin
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case Address.Kind of
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akLocalOrParent:
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begin
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ctx := Self;
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for i := 1 to Address.ScopeDepth do
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begin
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if not Assigned(ctx.FParent) then
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raise Exception.CreateFmt('Scope depth mismatch during type lookup. Requested Depth: %d.', [Address.ScopeDepth]);
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ctx := ctx.FParent;
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end;
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if (Address.SlotIndex >= 0) and (Address.SlotIndex < Length(ctx.FSlotTypes)) then
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Result := ctx.FSlotTypes[Address.SlotIndex]
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else
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Result := TTypes.Unknown;
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end;
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akUpvalue:
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begin
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// Look up type in our local upvalue type cache
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if (Address.SlotIndex >= 0) and (Address.SlotIndex < Length(FUpvalueTypes)) then
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Result := FUpvalueTypes[Address.SlotIndex]
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else
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Result := TTypes.Unknown;
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end;
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else
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Result := TTypes.Unknown;
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end;
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end;
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procedure TTypeChecker.TTypeContext.SetType(SlotIndex: Integer; AType: IStaticType);
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begin
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if (SlotIndex >= 0) and (SlotIndex < Length(FSlotTypes)) then
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FSlotTypes[SlotIndex] := AType;
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end;
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{ TTypeChecker }
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function TTypeChecker.CreateContextChain(L: IScopeLayout): TTypeContext;
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var
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p: TTypeContext;
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begin
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if L = nil then
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exit(nil);
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// Recursively build parent context
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p := CreateContextChain(L.Parent);
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// Create context for current layout level
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// Note: We don't know UpvalueTypes for these static/parent layouts here, so [] is passed.
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// Also: Slot types will be initialized to Unknown.
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Result := TTypeContext.Create(p, L, []);
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end;
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constructor TTypeChecker.Create(const RootLayout: IScopeLayout);
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begin
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inherited Create;
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// Build the full context chain based on the Layout's parent hierarchy
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// This ensures that ScopeDepth lookups can traverse up to the root.
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FCurrentContext := CreateContextChain(RootLayout);
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// Fallback if RootLayout is nil (should not happen in valid pipeline)
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if FCurrentContext = nil then
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FCurrentContext := TTypeContext.Create(nil, nil, []);
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end;
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destructor TTypeChecker.Destroy;
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begin
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// Cleanup context stack
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while Assigned(FCurrentContext) do
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begin
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var temp := FCurrentContext;
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FCurrentContext := FCurrentContext.FParent;
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temp.Free;
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end;
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inherited;
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end;
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class function TTypeChecker.CheckTypes(const RootNode: IAstNode; const Layout: IScopeLayout): IAstNode;
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begin
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var checker := TTypeChecker.Create(Layout) as IAstTypeChecker;
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Result := checker.Execute(RootNode, Layout);
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end;
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function TTypeChecker.Execute(const RootNode: IAstNode; const Layout: IScopeLayout): IAstNode;
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begin
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// Note: Layout passed here matches what was passed to Create/Constructor (via recursed ContextChain)
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Result := Accept(RootNode);
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if not Assigned(Result) then
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Result := TAst.Block([]);
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end;
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function TTypeChecker.VisitConstant(const Node: IConstantNode): IAstNode;
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begin
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Assert(Node.StaticType.Kind <> stUnknown);
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Result := Node;
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end;
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function TTypeChecker.VisitKeyword(const Node: IKeywordNode): IAstNode;
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begin
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Assert(Node.StaticType.Kind = stKeyword);
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Result := Node;
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end;
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function TTypeChecker.VisitIdentifier(const Node: IIdentifierNode): IAstNode;
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var
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typ: IStaticType;
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adr: TResolvedAddress;
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begin
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adr := Node.Address;
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// Lookup type in our scratchpad context using the address resolved by Binder
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typ := FCurrentContext.LookupType(adr);
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// Create a new node with the inferred type
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Result := TAst.Identifier(Node.Name, adr, typ);
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end;
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function TTypeChecker.VisitRecurNode(const Node: IRecurNode): IAstNode;
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var
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newArgs: TArray<IAstNode>;
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i: Integer;
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begin
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SetLength(newArgs, Length(Node.Arguments));
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for i := 0 to High(Node.Arguments) do
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newArgs[i] := Accept(Node.Arguments[i]);
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Result := TAst.Recur(newArgs, TTypes.Void);
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end;
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function TTypeChecker.VisitVariableDeclaration(const Node: IVariableDeclarationNode): IAstNode;
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var
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initType: IStaticType;
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newInitializer, newIdent: IAstNode;
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adr: TResolvedAddress;
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lambdaNode: ILambdaExpressionNode;
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placeholderType: IStaticType;
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i: Integer;
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begin
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adr := Node.Identifier.Address;
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initType := TTypes.Unknown;
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// Recursive lambda bootstrap logic
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placeholderType := nil;
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if (Node.Initializer <> nil) and (Node.Initializer.Kind = akLambdaExpression) then
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begin
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lambdaNode := Node.Initializer.AsLambdaExpression;
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var paramTypes: TArray<IStaticType>;
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SetLength(paramTypes, Length(lambdaNode.Parameters));
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for i := 0 to High(paramTypes) do
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paramTypes[i] := TTypes.Unknown;
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placeholderType := TTypes.CreateMethod(paramTypes, TTypes.Unknown);
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// Update Context (Scratchpad)
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FCurrentContext.SetType(adr.SlotIndex, placeholderType);
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initType := placeholderType;
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end;
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if Assigned(Node.Initializer) then
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newInitializer := Accept(Node.Initializer)
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else
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newInitializer := nil;
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if Assigned(newInitializer) then
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initType := newInitializer.AsTypedNode.StaticType
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else if not Assigned(placeholderType) then
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initType := TTypes.Unknown;
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// Update Context with final type
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if initType.Kind <> stUnknown then
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FCurrentContext.SetType(adr.SlotIndex, initType);
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newIdent := TAst.Identifier(Node.Identifier.Name, adr, initType);
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Result := TAst.VarDecl(newIdent.AsIdentifier, newInitializer, initType, Node.IsBoxed);
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end;
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function TTypeChecker.VisitAssignment(const Node: IAssignmentNode): IAstNode;
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var
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targetType, sourceType: IStaticType;
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newIdent, newValue: IAstNode;
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adr: TResolvedAddress;
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lambdaNode: ILambdaExpressionNode;
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placeholderType: IStaticType;
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i: Integer;
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begin
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newIdent := Accept(Node.Identifier);
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targetType := newIdent.AsTypedNode.StaticType;
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adr := newIdent.AsIdentifier.Address;
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// Recursive lambda assignment check
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placeholderType := nil;
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if (Node.Value <> nil) and (Node.Value.Kind = akLambdaExpression) then
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begin
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lambdaNode := Node.Value.AsLambdaExpression;
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if (targetType.Kind <> stMethod) then
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begin
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var paramTypes: TArray<IStaticType>;
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SetLength(paramTypes, Length(lambdaNode.Parameters));
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for i := 0 to High(paramTypes) do
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paramTypes[i] := TTypes.Unknown;
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placeholderType := TTypes.CreateMethod(paramTypes, TTypes.Unknown);
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FCurrentContext.SetType(adr.SlotIndex, placeholderType);
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targetType := placeholderType;
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end;
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end;
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newValue := Accept(Node.Value);
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sourceType := newValue.AsTypedNode.StaticType;
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if not TTypeRules.CanAssign(targetType, sourceType) then
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begin
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if (targetType.Kind = stUnknown) then
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begin
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if not TTypeRules.CanAssign(sourceType, targetType) then
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raise ETypeException.CreateFmt('Cannot assign type %s to %s', [sourceType.ToString, targetType.ToString]);
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end
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else
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raise ETypeException.CreateFmt('Cannot assign type %s to %s', [sourceType.ToString, targetType.ToString]);
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end;
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if ((targetType.Kind = stUnknown) or Assigned(placeholderType)) and (sourceType.Kind <> stUnknown) then
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begin
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FCurrentContext.SetType(adr.SlotIndex, sourceType);
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newIdent := TAst.Identifier(newIdent.AsIdentifier.Name, adr, sourceType);
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targetType := sourceType;
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end;
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Result := TAst.Assign(newIdent.AsIdentifier, newValue, targetType);
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end;
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function TTypeChecker.VisitLambdaExpression(const Node: ILambdaExpressionNode): IAstNode;
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var
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newParams: TArray<IIdentifierNode>;
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newBody: IAstNode;
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bodyType, methodType: IStaticType;
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paramTypes: TArray<IStaticType>;
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// Upvalue Type Resolution
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upvalueTypes: TArray<IStaticType>;
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upvalueAddrs: TArray<TResolvedAddress>;
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i: Integer;
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finalDescriptor: IScopeDescriptor;
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begin
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// 1. Resolve Upvalue Types *in the current (parent) context*
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upvalueAddrs := Node.Upvalues;
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SetLength(upvalueTypes, Length(upvalueAddrs));
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for i := 0 to High(upvalueAddrs) do
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begin
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// We look up the physical address (from Binder) in the current context chain
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upvalueTypes[i] := FCurrentContext.LookupType(upvalueAddrs[i]);
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end;
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// 2. Create new TypeContext for this lambda scope, PASSING the upvalue types
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// We use the layout from the Binder-Result-Node
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FCurrentContext := TTypeContext.Create(FCurrentContext, Node.Layout, upvalueTypes);
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try
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// 3. Set parameter types in the context
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SetLength(newParams, Length(Node.Parameters));
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SetLength(paramTypes, Length(Node.Parameters));
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for i := 0 to High(Node.Parameters) do
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begin
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var paramIdent := Node.Parameters[i];
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var paramAdr := paramIdent.Address;
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// Here we could infer types if we had type annotations. For now, parameters are Unknown.
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paramTypes[i] := TTypes.Unknown;
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// Update context so body can resolve params
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FCurrentContext.SetType(paramAdr.SlotIndex, paramTypes[i]);
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newParams[i] := TAst.Identifier(paramIdent.Name, paramAdr, paramTypes[i]);
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end;
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// 4. Visit body
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newBody := Accept(Node.Body);
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bodyType := newBody.AsTypedNode.StaticType;
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// 5. Create method type
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methodType := TTypes.CreateMethod(paramTypes, bodyType);
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// 6. Update <self> type in context (Slot 0)
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FCurrentContext.SetType(0, methodType);
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// 7. FINALIZE: Bake the Descriptor
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finalDescriptor := TScope.CreateDescriptor(Node.Layout, FCurrentContext.Types);
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finally
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// 8. Pop Context
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var temp := FCurrentContext;
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FCurrentContext := FCurrentContext.FParent;
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temp.Free;
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end;
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// 9. Create new node with the Descriptor attached!
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Result :=
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TAst.LambdaExpr(newParams, newBody, Node.Layout, finalDescriptor, Node.Upvalues, Node.HasNestedLambdas, Node.IsPure, methodType);
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end;
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function TTypeChecker.VisitFunctionCall(const Node: IFunctionCallNode): IAstNode;
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var
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calleeType, retType: IStaticType;
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i, j: Integer;
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newCallee: IAstNode;
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newArgs: TArray<IAstNode>;
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argTypes: TArray<IStaticType>;
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hasUnknownArgs: Boolean;
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bestSig: IMethodSignature;
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sig: IMethodSignature;
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match: Boolean;
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begin
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newCallee := Accept(Node.Callee);
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SetLength(newArgs, Length(Node.Arguments));
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SetLength(argTypes, Length(Node.Arguments));
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hasUnknownArgs := False;
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for i := 0 to High(Node.Arguments) do
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begin
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newArgs[i] := Accept(Node.Arguments[i]);
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argTypes[i] := newArgs[i].AsTypedNode.StaticType;
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if argTypes[i].Kind = stUnknown then
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hasUnknownArgs := True;
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end;
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calleeType := newCallee.AsTypedNode.StaticType;
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retType := TTypes.Unknown;
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if calleeType.Kind = TStaticTypeKind.stMethod then
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begin
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if not hasUnknownArgs then
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begin
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bestSig := nil;
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for sig in calleeType.Signatures do
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begin
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if Length(sig.ParamTypes) <> Length(argTypes) then
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continue;
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match := True;
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for j := 0 to High(argTypes) do
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begin
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if not TTypeRules.CanAssign(sig.ParamTypes[j], argTypes[j]) then
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begin
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match := False;
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break;
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end;
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end;
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if match then
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begin
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bestSig := sig;
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break;
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end;
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end;
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if Assigned(bestSig) then
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retType := bestSig.ReturnType
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else
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begin
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var argsStr: string := '';
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for i := 0 to High(argTypes) do
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argsStr := argsStr + argTypes[i].ToString + ' ';
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raise ETypeException
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.CreateFmt('No matching signature for call with args (%s) found on method %s', [argsStr, calleeType.ToString]);
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end;
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end;
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end
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else if calleeType.Kind <> TStaticTypeKind.stUnknown then
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raise ETypeException.CreateFmt('Cannot invoke type %s as a function.', [calleeType.ToString]);
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Result := TAst.FunctionCall(newCallee, newArgs, retType, Node.IsTailCall);
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end;
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function TTypeChecker.VisitBlockExpression(const Node: IBlockExpressionNode): IAstNode;
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var
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blockType: IStaticType;
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newExprs: TArray<IAstNode>;
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i: Integer;
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begin
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SetLength(newExprs, Length(Node.Expressions));
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for i := 0 to High(Node.Expressions) do
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newExprs[i] := Accept(Node.Expressions[i]);
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if Length(newExprs) > 0 then
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blockType := newExprs[High(newExprs)].AsTypedNode.StaticType
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else
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blockType := TTypes.Void;
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Result := TAst.Block(newExprs, blockType);
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end;
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function TTypeChecker.VisitIfExpression(const Node: IIfExpressionNode): IAstNode;
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var
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conditionType, thenType, elseType, resultType: IStaticType;
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newCond, newThen, newElse: IAstNode;
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begin
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newCond := Accept(Node.Condition);
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newThen := Accept(Node.ThenBranch);
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newElse := Accept(Node.ElseBranch);
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conditionType := newCond.AsTypedNode.StaticType;
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if (conditionType.Kind <> stUnknown) and not TTypeRules.CanAssign(TTypes.Ordinal, conditionType) then
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raise ETypeException.CreateFmt('If condition must be Ordinal, but got %s', [conditionType.ToString]);
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thenType := newThen.AsTypedNode.StaticType;
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elseType :=
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if newElse <> nil then newElse.AsTypedNode.StaticType
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else TTypes.Void;
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resultType := TTypeRules.Promote(thenType, elseType);
|
|
|
|
Result := TAst.IfExpr(newCond, newThen, newElse, resultType);
|
|
end;
|
|
|
|
function TTypeChecker.VisitTernaryExpression(const Node: ITernaryExpressionNode): IAstNode;
|
|
var
|
|
conditionType, thenType, elseType, resultType: IStaticType;
|
|
newCond, newThen, newElse: IAstNode;
|
|
begin
|
|
newCond := Accept(Node.Condition);
|
|
newThen := Accept(Node.ThenBranch);
|
|
newElse := Accept(Node.ElseBranch);
|
|
|
|
conditionType := newCond.AsTypedNode.StaticType;
|
|
if (conditionType.Kind <> stUnknown) and not TTypeRules.CanAssign(TTypes.Ordinal, conditionType) then
|
|
raise ETypeException.CreateFmt('Ternary condition must be Ordinal, but got %s', [conditionType.ToString]);
|
|
|
|
thenType := newThen.AsTypedNode.StaticType;
|
|
elseType := newElse.AsTypedNode.StaticType;
|
|
|
|
resultType := TTypeRules.Promote(thenType, elseType);
|
|
|
|
Result := TAst.TernaryExpr(newCond, newThen, newElse, resultType);
|
|
end;
|
|
|
|
function TTypeChecker.VisitMemberAccess(const Node: IMemberAccessNode): IAstNode;
|
|
var
|
|
baseType, elemType: IStaticType;
|
|
fieldIndex: Integer;
|
|
newBase, newMember: IAstNode;
|
|
begin
|
|
newBase := Accept(Node.Base);
|
|
newMember := Accept(Node.Member);
|
|
|
|
baseType := newBase.AsTypedNode.StaticType;
|
|
elemType := TTypes.Unknown;
|
|
|
|
if (baseType.Kind <> TStaticTypeKind.stUnknown) then
|
|
begin
|
|
if (baseType.Kind = TStaticTypeKind.stRecord) or (baseType.Kind = TStaticTypeKind.stRecordSeries) then
|
|
begin
|
|
fieldIndex := baseType.Definition.IndexOf(Node.Member.Value);
|
|
if fieldIndex < 0 then
|
|
raise ETypeException.CreateFmt('Member "%s" not found in type %s', [Node.Member.Value.Name, baseType.ToString]);
|
|
|
|
var fieldType := TTypes.FromScalarKind(baseType.Definition.Fields[fieldIndex].Value);
|
|
|
|
if baseType.Kind = TStaticTypeKind.stRecord then
|
|
elemType := fieldType
|
|
else
|
|
elemType := TTypes.CreateSeries(fieldType);
|
|
end
|
|
else if (baseType.Kind = TStaticTypeKind.stGenericRecord) then
|
|
begin
|
|
var genDef := baseType.GenericDefinition;
|
|
fieldIndex := genDef.IndexOf(Node.Member.Value);
|
|
if fieldIndex < 0 then
|
|
raise ETypeException.CreateFmt('Member "%s" not found in type %s', [Node.Member.Value.Name, baseType.ToString]);
|
|
elemType := genDef.Fields[fieldIndex].Value;
|
|
end
|
|
else
|
|
raise ETypeException.CreateFmt('Member access requires a record type, but got %s', [baseType.ToString]);
|
|
end;
|
|
|
|
Result := TAst.MemberAccess(newBase, newMember.AsKeyword, elemType);
|
|
end;
|
|
|
|
function TTypeChecker.VisitIndexer(const Node: IIndexerNode): IAstNode;
|
|
var
|
|
baseType, indexType, elemType: IStaticType;
|
|
newBase, newIndex: IAstNode;
|
|
begin
|
|
newBase := Accept(Node.Base);
|
|
newIndex := Accept(Node.Index);
|
|
|
|
baseType := newBase.AsTypedNode.StaticType;
|
|
indexType := newIndex.AsTypedNode.StaticType;
|
|
elemType := TTypes.Unknown;
|
|
|
|
if (baseType.Kind <> TStaticTypeKind.stUnknown) then
|
|
begin
|
|
if (baseType.Kind <> TStaticTypeKind.stSeries) and (baseType.Kind <> TStaticTypeKind.stRecordSeries) then
|
|
raise ETypeException.CreateFmt('Indexer `[]` can only be applied to series types, but got %s', [baseType.ToString]);
|
|
|
|
if (indexType.Kind <> stUnknown) and not TTypeRules.CanAssign(TTypes.Ordinal, indexType) then
|
|
raise ETypeException.CreateFmt('Indexer `[]` requires an Ordinal index, but got %s', [indexType.ToString]);
|
|
|
|
if baseType.Kind = TStaticTypeKind.stSeries then
|
|
elemType := baseType.ElementType
|
|
else
|
|
elemType := TTypes.CreateRecord(baseType.Definition);
|
|
end;
|
|
|
|
Result := TAst.Indexer(newBase, newIndex, elemType);
|
|
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<TRecordFieldLiteral>;
|
|
begin
|
|
SetLength(newFields, Length(Node.Fields));
|
|
for i := 0 to High(Node.Fields) do
|
|
begin
|
|
newFields[i].Key := Accept(Node.Fields[i].Key).AsKeyword;
|
|
newFields[i].Value := Accept(Node.Fields[i].Value);
|
|
end;
|
|
|
|
SetLength(scalarDefFields, Length(newFields));
|
|
allScalar := True;
|
|
|
|
for i := 0 to High(newFields) do
|
|
begin
|
|
valType := newFields[i].Value.AsTypedNode.StaticType;
|
|
|
|
if (valType.Kind = stOrdinal) then
|
|
scalarKind := TScalar.TKind.Ordinal
|
|
else if (valType.Kind = stFloat) then
|
|
scalarKind := TScalar.TKind.Float
|
|
else if (valType.Kind = stKeyword) then
|
|
scalarKind := TScalar.TKind.Keyword
|
|
else
|
|
begin
|
|
allScalar := False;
|
|
scalarKind := TScalar.TKind.Ordinal;
|
|
end;
|
|
|
|
if allScalar then
|
|
scalarDefFields[i] := TScalarRecordField.Create(newFields[i].Key.Value, scalarKind);
|
|
end;
|
|
|
|
if allScalar then
|
|
begin
|
|
def := TScalarRecordRegistry.Intern(scalarDefFields);
|
|
staticType := TTypes.CreateRecord(def);
|
|
Result := TAst.RecordLiteral(newFields, def, nil, staticType);
|
|
end
|
|
else
|
|
begin
|
|
var genDefFields: TArray<TPair<IKeyword, IStaticType>>;
|
|
SetLength(genDefFields, Length(newFields));
|
|
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(newFields, nil, genDef, staticType);
|
|
end;
|
|
end;
|
|
|
|
function TTypeChecker.VisitCreateSeries(const Node: ICreateSeriesNode): IAstNode;
|
|
var
|
|
elemType: IStaticType;
|
|
begin
|
|
try
|
|
elemType := TTypes.FromScalarKind(TScalar.StringToKind(Node.Definition));
|
|
except
|
|
on E: Exception do
|
|
elemType := TTypes.Unknown;
|
|
end;
|
|
|
|
Result := TAst.CreateSeries(Node.Definition, TTypes.CreateSeries(elemType));
|
|
end;
|
|
|
|
function TTypeChecker.VisitAddSeriesItem(const Node: IAddSeriesItemNode): IAstNode;
|
|
var
|
|
seriesType, valueType: IStaticType;
|
|
newSeries, newValue, newLookback: IAstNode;
|
|
begin
|
|
newSeries := Accept(Node.Series);
|
|
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
|
|
raise ETypeException.CreateFmt('"add" requires a series as its first argument, but got %s', [seriesType.ToString]);
|
|
|
|
if not TTypeRules.CanAssign(seriesType.ElementType, valueType) then
|
|
raise ETypeException
|
|
.CreateFmt('Cannot add item of type %s to series of type %s', [valueType.ToString, seriesType.ElementType.ToString]);
|
|
end;
|
|
|
|
if (newLookback <> nil) then
|
|
begin
|
|
var lookbackType := newLookback.AsTypedNode.StaticType;
|
|
if (lookbackType.Kind <> stUnknown) and not (lookbackType.Kind = TStaticTypeKind.stOrdinal) then
|
|
raise ETypeException.Create('Lookback parameter for "add" must be an ordinal value.');
|
|
end;
|
|
|
|
Result := TAst.AddSeriesItem(newSeries.AsIdentifier, newValue, newLookback, TTypes.Void);
|
|
end;
|
|
|
|
function TTypeChecker.VisitNop(const Node: INopNode): IAstNode;
|
|
begin
|
|
Result := TAst.Nop(TTypes.Void);
|
|
end;
|
|
|
|
function TTypeChecker.VisitSeriesLength(const Node: ISeriesLengthNode): IAstNode;
|
|
var
|
|
seriesType: IStaticType;
|
|
newSeries: IAstNode;
|
|
begin
|
|
newSeries := Accept(Node.Series);
|
|
seriesType := newSeries.AsTypedNode.StaticType;
|
|
|
|
if (seriesType.Kind <> stUnknown)
|
|
and (seriesType.Kind <> TStaticTypeKind.stSeries)
|
|
and (seriesType.Kind <> TStaticTypeKind.stRecordSeries) then
|
|
raise ETypeException.CreateFmt('"length" requires a series, but got %s', [seriesType.ToString]);
|
|
|
|
Result := TAst.SeriesLength(newSeries.AsIdentifier, TTypes.Ordinal);
|
|
end;
|
|
|
|
end.
|