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Optional types and null propagation

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This commit is contained in:
Michael Schimmel
2025-12-21 15:20:59 +01:00
parent e7fdbc3312
commit ac96a105a5
10 changed files with 840 additions and 190 deletions
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Src/AST/Myc.Ast.Compiler.TypeChecker.pas
+159 -53
View File
@@ -17,7 +17,7 @@ uses
type
IAstTypeChecker = interface(IAstVisitor)
function Execute(const RootNode: IAstNode; const Layout: IScopeLayout): IAstNode;
function Execute(const RootNode: IAstNode): IAstNode;
end;
TTypeChecker = class(TAstTransformer, IAstTypeChecker)
@@ -30,7 +30,12 @@ type
FSlotTypes: TArray<IStaticType>;
FUpvalueTypes: TArray<IStaticType>;
public
constructor Create(AParent: TTypeContext; ALayout: IScopeLayout; const AUpvalueTypes: TArray<IStaticType>);
constructor Create(
AParent: TTypeContext;
ALayout: IScopeLayout;
const AUpvalueTypes: TArray<IStaticType>;
ADescriptor: IScopeDescriptor
);
function LookupType(const Address: TResolvedAddress): IStaticType;
procedure SetType(SlotIndex: Integer; AType: IStaticType);
property Types: TArray<IStaticType> read FSlotTypes;
@@ -39,9 +44,14 @@ type
private
FCurrentContext: TTypeContext;
FLog: ICompilerLog;
FRootScope: IExecutionScope;
function CreateContextChain(L: IScopeLayout): TTypeContext;
// Helpers for Null Propagation
function PrepareBaseType(const BaseNode: IAstNode; out IsOptional: Boolean): IStaticType;
function ApplyOptionality(const AType: IStaticType; IsOptional: Boolean): IStaticType;
protected
function VisitIdentifier(const Node: IIdentifierNode): IAstNode; override;
function VisitVariableDeclaration(const Node: IVariableDeclarationNode): IAstNode; override;
@@ -50,7 +60,7 @@ 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; // Replaced Ternary
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;
@@ -64,12 +74,17 @@ type
function VisitKeyword(const Node: IKeywordNode): IAstNode; override;
public
constructor Create(const RootLayout: IScopeLayout; const ALog: ICompilerLog);
constructor Create(const RootLayout: IScopeLayout; const RootScope: IExecutionScope; const ALog: ICompilerLog);
destructor Destroy; override;
function Execute(const RootNode: IAstNode; const Layout: IScopeLayout): IAstNode;
function Execute(const RootNode: IAstNode): IAstNode;
class function CheckTypes(const RootNode: IAstNode; const Layout: IScopeLayout; const ALog: ICompilerLog): IAstNode; static;
class function CheckTypes(
const RootNode: IAstNode;
const Layout: IScopeLayout;
const RootScope: IExecutionScope;
const ALog: ICompilerLog
): IAstNode; static;
end;
implementation
@@ -80,7 +95,14 @@ uses
{ TTypeChecker.TTypeContext }
constructor TTypeChecker.TTypeContext.Create(AParent: TTypeContext; ALayout: IScopeLayout; const AUpvalueTypes: TArray<IStaticType>);
constructor TTypeChecker.TTypeContext.Create(
AParent: TTypeContext;
ALayout: IScopeLayout;
const AUpvalueTypes: TArray<IStaticType>;
ADescriptor: IScopeDescriptor
);
var
i: Integer;
begin
inherited Create;
FParent := AParent;
@@ -90,8 +112,19 @@ begin
if Assigned(FLayout) then
begin
SetLength(FSlotTypes, FLayout.SlotCount);
for var i := 0 to High(FSlotTypes) do
FSlotTypes[i] := TTypes.Unknown;
if Assigned(ADescriptor) then
begin
// Load known types from descriptor (e.g. for Root Scope / RTL)
for i := 0 to High(FSlotTypes) do
FSlotTypes[i] := ADescriptor.GetSymbolType(i);
end
else
begin
// Initialize with Unknown for new scopes
for i := 0 to High(FSlotTypes) do
FSlotTypes[i] := TTypes.Unknown;
end;
end;
end;
@@ -142,21 +175,33 @@ end;
function TTypeChecker.CreateContextChain(L: IScopeLayout): TTypeContext;
var
p: TTypeContext;
desc: IScopeDescriptor;
begin
if L = nil then
exit(nil);
p := CreateContextChain(L.Parent);
Result := TTypeContext.Create(p, L, []);
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;
end;
Result := TTypeContext.Create(p, L, [], desc);
end;
constructor TTypeChecker.Create(const RootLayout: IScopeLayout; const ALog: ICompilerLog);
constructor TTypeChecker.Create(const RootLayout: IScopeLayout; const RootScope: IExecutionScope; const ALog: ICompilerLog);
begin
inherited Create;
FLog := ALog;
FRootScope := RootScope;
FCurrentContext := CreateContextChain(RootLayout);
if FCurrentContext = nil then
FCurrentContext := TTypeContext.Create(nil, nil, []);
FCurrentContext := TTypeContext.Create(nil, nil, [], nil);
end;
destructor TTypeChecker.Destroy;
@@ -170,19 +215,56 @@ begin
inherited;
end;
class function TTypeChecker.CheckTypes(const RootNode: IAstNode; const Layout: IScopeLayout; const ALog: ICompilerLog): IAstNode;
class function TTypeChecker.CheckTypes(
const RootNode: IAstNode;
const Layout: IScopeLayout;
const RootScope: IExecutionScope;
const ALog: ICompilerLog
): IAstNode;
var
startLayout: IScopeLayout;
begin
var checker := TTypeChecker.Create(Layout, ALog) as IAstTypeChecker;
Result := checker.Execute(RootNode, Layout);
// 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
startLayout := nil;
var checker := TTypeChecker.Create(startLayout, RootScope, ALog) as IAstTypeChecker;
Result := checker.Execute(RootNode);
end;
function TTypeChecker.Execute(const RootNode: IAstNode; const Layout: IScopeLayout): IAstNode;
function TTypeChecker.Execute(const RootNode: IAstNode): IAstNode;
begin
Result := Accept(RootNode);
if not Assigned(Result) then
Result := TAst.Block([], nil);
end;
// --- Helper ---
function TTypeChecker.PrepareBaseType(const BaseNode: IAstNode; out IsOptional: Boolean): IStaticType;
var
baseType: IStaticType;
begin
baseType := BaseNode.AsTypedNode.StaticType;
IsOptional := baseType.IsOptional;
Result := TTypes.Unwrap(baseType);
end;
function TTypeChecker.ApplyOptionality(const AType: IStaticType; IsOptional: Boolean): IStaticType;
begin
if IsOptional and (AType.Kind <> stUnknown) then
Result := TTypes.MakeOptional(AType)
else
Result := AType;
end;
// --- Visits ---
function TTypeChecker.VisitConstant(const Node: IConstantNode): IAstNode;
begin
Result := Node;
@@ -221,7 +303,6 @@ begin
for i := 0 to Node.Arguments.Count - 1 do
newArgs[i] := Accept(Node.Arguments[i]);
// Wrap in List
var argList := TArgumentList.Create(newArgs, Node.Arguments.Identity);
Result := TAst.Recur(Node.Identity, argList, TTypes.Void);
end;
@@ -358,14 +439,40 @@ var
finalDescriptor: IScopeDescriptor;
paramIdent: IIdentifierNode;
paramIdentity: INamedIdentity;
lookupAddr: TResolvedAddress;
begin
// 1. Resolve Upvalue Types
upvalueAddrs := Node.Upvalues;
SetLength(upvalueTypes, Length(upvalueAddrs));
for i := 0 to High(upvalueAddrs) do
upvalueTypes[i] := FCurrentContext.LookupType(upvalueAddrs[i]);
FCurrentContext := TTypeContext.Create(FCurrentContext, Node.Layout, upvalueTypes);
for i := 0 to High(upvalueAddrs) do
begin
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)
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")
FCurrentContext := TTypeContext.Create(FCurrentContext, Node.Layout, upvalueTypes, nil);
try
// 3. Register Parameters
SetLength(newParams, Node.Parameters.Count);
SetLength(paramTypes, Node.Parameters.Count);
@@ -383,21 +490,22 @@ begin
newParams[i] := TAst.Identifier(paramIdentity, paramAdr, paramTypes[i]);
end;
// 4. Visit Body
newBody := Accept(Node.Body);
// 5. Determine Function Signature
bodyType := newBody.AsTypedNode.StaticType;
methodType := TTypes.CreateMethod(paramTypes, bodyType);
FCurrentContext.SetType(0, methodType);
finalDescriptor := TScope.CreateDescriptor(Node.Layout, FCurrentContext.Types);
finally
// 6. Leave Scope
var temp := FCurrentContext;
FCurrentContext := FCurrentContext.FParent;
temp.Free;
end;
// Wrap in List
var paramList := TParameterList.Create(newParams, Node.Parameters.Identity);
Result :=
TAst.LambdaExpr(
Node.Identity,
@@ -493,9 +601,7 @@ begin
retType := TTypes.Unknown;
end;
// Wrap in List
var argList := TArgumentList.Create(newArgs, Node.Arguments.Identity);
Result := TAst.FunctionCall(Node.Identity, newCallee, argList, retType, Node.IsTailCall, nil, False);
end;
@@ -514,7 +620,6 @@ begin
else
blockType := TTypes.Void;
// Wrap in List
var exprList := TExpressionList.Create(newExprs, Node.Expressions.Identity);
Result := TAst.Block(Node.Identity, exprList, blockType);
end;
@@ -561,11 +666,10 @@ var
condType, branchType, resultType: IStaticType;
begin
SetLength(newPairs, Length(Node.Pairs));
resultType := nil; // Start with nothing
resultType := nil;
for i := 0 to High(Node.Pairs) do
begin
// 1. Visit Condition
var newCond := Accept(Node.Pairs[i].Condition);
condType := newCond.AsTypedNode.StaticType;
@@ -577,13 +681,11 @@ begin
FLog.AddError(Format('Cond condition must be Boolean or Ordinal, but got %s', [condType.ToString]), Node);
end;
// 2. Visit Branch
var newBranch := Accept(Node.Pairs[i].Branch);
branchType := newBranch.AsTypedNode.StaticType;
newPairs[i] := TCondPair.Create(newCond, newBranch);
// 3. Promote Result Type
if resultType = nil then
resultType := branchType
else
@@ -603,9 +705,7 @@ begin
end;
end;
// 4. Visit Else
newElse := Accept(Node.ElseBranch);
// Else branch is mandatory in our new AST structure (can be Nop/Void, but is present)
var elseType := newElse.AsTypedNode.StaticType;
if resultType = nil then
@@ -631,43 +731,44 @@ end;
function TTypeChecker.VisitMemberAccess(const Node: IMemberAccessNode): IAstNode;
var
baseType, elemType: IStaticType;
unwrappedBaseType, elemType: IStaticType;
fieldIndex: Integer;
newBase, newMember: IAstNode;
isOptionalAccess: Boolean;
begin
newBase := Accept(Node.Base);
newMember := Accept(Node.Member);
baseType := newBase.AsTypedNode.StaticType;
unwrappedBaseType := PrepareBaseType(newBase, isOptionalAccess);
elemType := TTypes.Unknown;
if (baseType.Kind <> TStaticTypeKind.stUnknown) then
if (unwrappedBaseType.Kind <> TStaticTypeKind.stUnknown) then
begin
if (baseType.Kind = TStaticTypeKind.stRecord) or (baseType.Kind = TStaticTypeKind.stRecordSeries) then
if (unwrappedBaseType.Kind = TStaticTypeKind.stRecord) or (unwrappedBaseType.Kind = TStaticTypeKind.stRecordSeries) then
begin
fieldIndex := baseType.Definition.IndexOf(Node.Member.Value);
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, baseType.ToString]), Node);
FLog.AddError(Format('Member "%s" not found in type %s', [Node.Member.Value.Name, unwrappedBaseType.ToString]), Node);
end
else
begin
var fieldType := TTypes.FromScalarKind(baseType.Definition[fieldIndex].Value);
if baseType.Kind = TStaticTypeKind.stRecord then
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 (baseType.Kind = TStaticTypeKind.stGenericRecord) then
else if (unwrappedBaseType.Kind = TStaticTypeKind.stGenericRecord) then
begin
var genDef := baseType.GenericDefinition;
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, baseType.ToString]), Node);
FLog.AddError(Format('Member "%s" not found in type %s', [Node.Member.Value.Name, unwrappedBaseType.ToString]), Node);
end
else
elemType := genDef[fieldIndex].Value;
@@ -675,38 +776,42 @@ begin
else
begin
if Assigned(FLog) then
FLog.AddError(Format('Member access requires a record type, but got %s', [baseType.ToString]), Node);
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
baseType, indexType, elemType: IStaticType;
unwrappedBaseType, indexType, elemType: IStaticType;
newBase, newIndex: IAstNode;
isOptionalAccess: Boolean;
begin
newBase := Accept(Node.Base);
newIndex := Accept(Node.Index);
baseType := newBase.AsTypedNode.StaticType;
unwrappedBaseType := PrepareBaseType(newBase, isOptionalAccess);
indexType := newIndex.AsTypedNode.StaticType;
elemType := TTypes.Unknown;
if (baseType.Kind <> TStaticTypeKind.stUnknown) then
if (unwrappedBaseType.Kind <> TStaticTypeKind.stUnknown) then
begin
if (baseType.Kind <> TStaticTypeKind.stSeries) and (baseType.Kind <> TStaticTypeKind.stRecordSeries) then
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', [baseType.ToString]), Node);
FLog.AddError(Format('Indexer `[]` can only be applied to series types, but got %s', [unwrappedBaseType.ToString]), Node);
end
else
begin
if baseType.Kind = TStaticTypeKind.stSeries then
elemType := baseType.ElementType
if unwrappedBaseType.Kind = TStaticTypeKind.stSeries then
elemType := unwrappedBaseType.ElementType
else
elemType := TTypes.CreateRecord(baseType.Definition);
elemType := TTypes.CreateRecord(unwrappedBaseType.Definition);
end;
end;
@@ -716,6 +821,8 @@ begin
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;
@@ -770,7 +877,6 @@ begin
scalarDefFields[i] := TScalarRecordField.Create(newFields[i].Key.Value, scalarKind);
end;
// Wrap in List
var fieldList := TRecordFieldList.Create(newFields, Node.Fields.Identity);
if allScalar then
Src/AST/Myc.Ast.Environment.pas
+1 -1
View File
@@ -378,7 +378,7 @@ begin
var boundAst := TAstBinder.Bind(FRootScope.Descriptor.Layout, Node, Layout, Log, FFunctionRegistry, ArgTypes);
// 2. Check Types (produces Typed AST with Descriptors baked into nodes)
Result := TTypeChecker.CheckTypes(boundAst, Layout, Log);
Result := TTypeChecker.CheckTypes(boundAst, Layout, FRootScope, Log);
end;
function TEnvironment.GetMacroRegistry: IMacroRegistry;
Src/AST/Myc.Ast.Evaluator.pas
+7
View File
@@ -413,6 +413,10 @@ var
scalarValue: TScalar;
begin
baseValue := Node.Base.Accept(Self);
if baseValue.IsVoid then
exit(TDataValue.Void);
indexValue := Node.Index.Accept(Self);
if (indexValue.Kind <> vkScalar) or (indexValue.AsScalar.Kind <> TScalar.TKind.Ordinal) then
@@ -461,6 +465,9 @@ var
begin
baseValue := Node.Base.Accept(Self);
if baseValue.IsVoid then
exit(TDataValue.Void);
case baseValue.Kind of
vkRecordSeries: Result := TDataValue.FromSeries(baseValue.AsRecordSeries.Fields[Node.Member.Value]);
vkScalarRecord: Result := TDataValue(baseValue.AsScalarRecord.Fields[Node.Member.Value]);
Src/AST/Myc.Ast.Script.pas
+46 -6
View File
@@ -639,10 +639,9 @@ begin
else if SameText(head.Token.Text, '?') then
begin
// (? test1 branch1 test2 branch2 ... else)
// Requires odd number of tailNodes (pairs + 1 else)
var count := Length(tailNodes);
if (count < 1) or ((count mod 2) = 0) then
Error('Syntax Error: ''?'' (cond) requires an odd number of arguments (pairs of condition/branch and one final else).');
Error('Syntax Error: ''?'' (cond) requires an odd number of arguments.');
var pairs: TArray<TCondPair>;
SetLength(pairs, count div 2);
@@ -667,7 +666,7 @@ begin
Error('Syntax Error: ''defmacro'' requires a name, a parameter list, and a body.');
var macroName := tailNodes[0].AsIdentifier;
var macroParams := elements[2].Params;
var macroParams := elements[2].Params; // Parameter list parsing happens in ParseExpression for brackets
if tailNodes[2].Kind <> akQuasiquote then
Error('Syntax Error: Expected a quasiquote as macro body.');
@@ -677,25 +676,68 @@ begin
else if SameText(head.Token.Text, 'assign') then
begin
if Length(tailNodes) <> 2 then
Error('Syntax Error: ''assign'' requires exactly 2 arguments (target and value).');
Error('Syntax Error: ''assign'' requires exactly 2 arguments.');
Result := TAst.Assign(tailNodes[0], tailNodes[1], startLoc);
end
else if SameText(head.Token.Text, 'fn') then
begin
if Length(tailNodes) <> 2 then
Error('Syntax Error: ''fn'' requires a parameter list and a body.');
// elements[1] is the parameter list node which contains the parsed Params array
Result := TAst.LambdaExpr(elements[1].Params, tailNodes[1], startLoc);
end
else if SameText(head.Token.Text, 'do') then
begin
Result := TAst.Block(tailNodes, startLoc)
end
else if SameText(head.Token.Text, 'recur') then
begin
Result := TAst.Recur(tailNodes, startLoc)
end
else if SameText(head.Token.Text, 'get') then
begin
if Length(tailNodes) <> 2 then
Error('Syntax Error: ''get'' requires exactly 2 arguments (base and index).');
Result := TAst.Indexer(tailNodes[0], tailNodes[1], startLoc)
end
// --- NEW: Support for new-series ---
else if SameText(head.Token.Text, 'new-series') then
begin
if Length(tailNodes) <> 1 then
Error('Syntax Error: ''new-series'' requires exactly 1 argument (definition string).');
// Extract definition string from constant node
if (tailNodes[0].Kind = akConstant) and (tailNodes[0].AsConstant.Value.Kind = vkText) then
Result := TAst.CreateSeries(tailNodes[0].AsConstant.Value.AsText, startLoc)
else
Error('Syntax Error: ''new-series'' argument must be a string literal.');
end
// --- NEW: Support for add-item ---
else if SameText(head.Token.Text, 'add-item') then
begin
if not (Length(tailNodes) in [2, 3]) then
Error('Syntax Error: ''add-item'' requires 2 or 3 arguments (series, value, [lookback]).');
var lookback: IAstNode := nil;
if Length(tailNodes) = 3 then
lookback := tailNodes[2];
if tailNodes[0].Kind <> akIdentifier then
Error('Syntax Error: ''add-item'' first argument must be a series identifier.');
Result := TAst.AddSeriesItem(tailNodes[0].AsIdentifier, tailNodes[1], lookback, startLoc);
end
// --- NEW: Support for count (SeriesLength) ---
else if SameText(head.Token.Text, 'count') then
begin
if Length(tailNodes) <> 1 then
Error('Syntax Error: ''count'' requires exactly 1 argument (series).');
if tailNodes[0].Kind <> akIdentifier then
Error('Syntax Error: ''count'' argument must be a series identifier.');
Result := TAst.SeriesLength(tailNodes[0].AsIdentifier, startLoc);
end
else if (Length(head.Token.Text) > 1) and (head.Token.Text.StartsWith('.')) then
begin
if Length(tailNodes) <> 1 then
@@ -1136,8 +1178,6 @@ class function TAstScript.Parse(const ASource: string): IAstNode;
var
p: TParser;
begin
if ASource.Trim.IsEmpty then
exit(nil);
p := TParser.Create(ASource);
try
Result := p.Parse;
Src/AST/Myc.Ast.Types.pas
+460 -127
View File
@@ -5,18 +5,18 @@ interface
uses
System.SysUtils,
System.Generics.Collections,
System.Generics.Defaults,
Myc.Data.Scalar,
Myc.Data.Keyword;
type
IStaticType = interface;
// Defines the categories of types available in the language.
TStaticTypeKind = (
stUnknown, // Used during inference before a type is known
stUnknown,
stVoid,
stOrdinal, // Int64
stFloat, // Double
stOrdinal,
stFloat,
stBoolean,
stDateTime,
stText,
@@ -33,7 +33,6 @@ type
function ToString: string;
end;
// Defines the signature of a method
IMethodSignature = interface
{$region 'private'}
function GetParamTypes: TArray<IStaticType>;
@@ -44,40 +43,32 @@ type
function GetHashCode: Integer;
end;
// Defines a mapping for generic record fields (Key -> StaticType)
IGenericRecordDefinition = IKeywordMapping<IStaticType>;
TGenericRecordRegistry = TKeywordMappingRegistry<IStaticType>;
// Represents a complete static type definition.
IStaticType = interface
{$region 'private'}
function GetKind: TStaticTypeKind;
function GetIsOptional: Boolean;
function GetElementType: IStaticType;
function GetSignatures: TArray<IMethodSignature>;
function GetDefinition: IScalarRecordDefinition;
function GetGenericDefinition: IGenericRecordDefinition;
{$endregion}
// The kind of type (e.g., Ordinal, Series, etc.)
property Kind: TStaticTypeKind read GetKind;
// The element type (if Kind = stSeries)
property IsOptional: Boolean read GetIsOptional;
property ElementType: IStaticType read GetElementType;
// The signatures (if Kind = stMethod).
property Signatures: TArray<IMethodSignature> read GetSignatures;
// The definition (if Kind = stRecord or stRecordSeries)
property Definition: IScalarRecordDefinition read GetDefinition;
// The definition (if Kind = stGenericRecord)
property GenericDefinition: IGenericRecordDefinition read GetGenericDefinition;
// Checks for type equality
function IsEqual(const Other: IStaticType): Boolean;
function IsStructurallyEqual(const Other: IStaticType): Boolean;
function ToString: string;
function GetHashCode: Integer;
end;
// Factory and Flyweight access for static types.
TTypes = record
private
class var
@@ -97,9 +88,35 @@ type
class var
FKeyword: IStaticType;
class var
FOrdinalOpt: IStaticType;
class var
FFloatOpt: IStaticType;
class var
FBooleanOpt: IStaticType;
class var
FDateTimeOpt: IStaticType;
class var
FTextOpt: IStaticType;
class var
FKeywordOpt: IStaticType;
class var
FSeriesCache: TDictionary<IStaticType, IStaticType>;
class var
FRecordCache: TDictionary<IScalarRecordDefinition, IStaticType>;
class var
FRecordSeriesCache: TDictionary<IScalarRecordDefinition, IStaticType>;
class var
FGenericRecordCache: TDictionary<IGenericRecordDefinition, IStaticType>;
class var
FMethodCache: TDictionary<TArray<IMethodSignature>, IStaticType>;
class var
FOptionalCache: TDictionary<IStaticType, IStaticType>;
class constructor Create;
class destructor Destroy;
public
// Flyweight accessors
class property Unknown: IStaticType read FUnknown;
class property Void: IStaticType read FVoid;
class property Ordinal: IStaticType read FOrdinal;
@@ -109,7 +126,13 @@ type
class property Text: IStaticType read FText;
class property Keyword: IStaticType read FKeyword;
// Factory functions
class property OrdinalOpt: IStaticType read FOrdinalOpt;
class property FloatOpt: IStaticType read FFloatOpt;
class property BooleanOpt: IStaticType read FBooleanOpt;
class property DateTimeOpt: IStaticType read FDateTimeOpt;
class property TextOpt: IStaticType read FTextOpt;
class property KeywordOpt: IStaticType read FKeywordOpt;
class function CreateSeries(const AElementType: IStaticType): IStaticType; static;
class function CreateMethod(const AParamTypes: TArray<IStaticType>; const AReturnType: IStaticType): IStaticType; static;
class function CreateMethodSet(const ASignatures: TArray<IMethodSignature>): IStaticType; static;
@@ -117,22 +140,16 @@ type
class function CreateRecordSeries(const ADef: IScalarRecordDefinition): IStaticType; static;
class function CreateGenericRecord(const ADef: IGenericRecordDefinition): IStaticType; static;
class function MakeOptional(const AType: IStaticType): IStaticType; static;
class function Unwrap(const AType: IStaticType): IStaticType; static;
class function FromScalarKind(AKind: TScalar.TKind): IStaticType; static;
end;
// Defines the rules of the type system.
TTypeRules = record
public
// Returns the common type (promotion) or nil if incompatible.
class function Promote(const A, B: IStaticType): IStaticType; static;
// Checks if a value of type 'Source' can be assigned to 'Target'.
class function CanAssign(const Target, Source: IStaticType): Boolean; static;
// Determines the result type of a binary operation. Returns nil on failure.
class function ResolveBinaryOp(Op: TScalar.TBinaryOp; const Left, Right: IStaticType): IStaticType; static;
// Determines the result type of a unary operation. Returns nil on failure.
class function ResolveUnaryOp(Op: TScalar.TUnaryOp; const Right: IStaticType): IStaticType; static;
end;
@@ -150,8 +167,7 @@ type
implementation
uses
System.Generics.Defaults,
System.Hash;
System.Hash; // Critical for robust hash calculations
{ TStaticTypeKindHelper }
@@ -182,15 +198,22 @@ type
TAbstractStaticType = class(TInterfacedObject, IStaticType)
protected
function GetKind: TStaticTypeKind; virtual; abstract;
function GetIsOptional: Boolean; virtual;
function GetElementType: IStaticType; virtual;
function GetSignatures: TArray<IMethodSignature>; virtual;
function GetDefinition: IScalarRecordDefinition; virtual;
function GetGenericDefinition: IGenericRecordDefinition; virtual;
function IsEqual(const Other: IStaticType): Boolean; virtual;
function IsStructurallyEqual(const Other: IStaticType): Boolean; virtual;
function GetHashCode: Integer; override; abstract;
function ToString: string; override;
end;
function TAbstractStaticType.GetIsOptional: Boolean;
begin
Result := False;
end;
function TAbstractStaticType.GetElementType: IStaticType;
begin
Result := nil;
@@ -211,11 +234,20 @@ begin
Result := nil;
end;
function TAbstractStaticType.IsStructurallyEqual(const Other: IStaticType): Boolean;
begin
if not Assigned(Other) then
exit(False);
Result := (GetKind = TTypes.Unwrap(Other).Kind);
end;
function TAbstractStaticType.IsEqual(const Other: IStaticType): Boolean;
begin
if not Assigned(Other) then
exit(False);
Result := (GetKind = Other.Kind);
if GetIsOptional <> Other.IsOptional then
exit(False);
Result := IsStructurallyEqual(Other);
end;
function TAbstractStaticType.ToString: string;
@@ -223,6 +255,93 @@ begin
Result := GetKind.ToString;
end;
// --- Optional Type Decorator ---
type
TOptionalType = class(TInterfacedObject, IStaticType)
private
FInner: IStaticType;
public
constructor Create(const AInner: IStaticType);
function GetKind: TStaticTypeKind;
function GetIsOptional: Boolean;
function GetElementType: IStaticType;
function GetSignatures: TArray<IMethodSignature>;
function GetDefinition: IScalarRecordDefinition;
function GetGenericDefinition: IGenericRecordDefinition;
function IsStructurallyEqual(const Other: IStaticType): Boolean;
function IsEqual(const Other: IStaticType): Boolean;
function GetHashCode: Integer; override;
function ToString: string; override;
end;
constructor TOptionalType.Create(const AInner: IStaticType);
begin
inherited Create;
FInner := AInner;
end;
function TOptionalType.GetKind: TStaticTypeKind;
begin
Result := FInner.Kind;
end;
function TOptionalType.GetIsOptional: Boolean;
begin
Result := True;
end;
function TOptionalType.GetElementType: IStaticType;
begin
Result := FInner.ElementType;
end;
function TOptionalType.GetSignatures: TArray<IMethodSignature>;
begin
Result := FInner.Signatures;
end;
function TOptionalType.GetDefinition: IScalarRecordDefinition;
begin
Result := FInner.Definition;
end;
function TOptionalType.GetGenericDefinition: IGenericRecordDefinition;
begin
Result := FInner.GenericDefinition;
end;
function TOptionalType.IsStructurallyEqual(const Other: IStaticType): Boolean;
begin
Result := FInner.IsStructurallyEqual(TTypes.Unwrap(Other));
end;
function TOptionalType.IsEqual(const Other: IStaticType): Boolean;
begin
if not Assigned(Other) then
exit(False);
if not Other.IsOptional then
exit(False);
Result := IsStructurallyEqual(Other);
end;
function TOptionalType.GetHashCode: Integer;
var
h: Integer;
optionalMarker: Integer;
begin
// We mix the Inner Hash with a constant marker using BobJenkins to ensure
// T and T? have distinct, uncorrelated hashes.
h := FInner.GetHashCode;
optionalMarker := $11111111; // Arbitrary constant to signal "Optionality"
Result := THashBobJenkins.GetHashValue(optionalMarker, SizeOf(Integer), h);
end;
function TOptionalType.ToString: string;
begin
Result := FInner.ToString + '?';
end;
// --- Simple (Flyweight) Type Implementations ---
type
@@ -248,7 +367,7 @@ end;
function TSimpleStaticType.GetHashCode: Integer;
begin
Result := Ord(FKind);
Result := THashBobJenkins.GetHashValue(FKind, SizeOf(TStaticTypeKind), 0);
end;
// --- Complex Type Implementations ---
@@ -261,7 +380,7 @@ type
constructor Create(AElementType: IStaticType);
function GetKind: TStaticTypeKind; override;
function GetElementType: IStaticType; override;
function IsEqual(const Other: IStaticType): Boolean; override;
function IsStructurallyEqual(const Other: IStaticType): Boolean; override;
function GetHashCode: Integer; override;
function ToString: string; override;
end;
@@ -282,18 +401,24 @@ begin
Result := FElementType;
end;
function TSeriesType.IsEqual(const Other: IStaticType): Boolean;
function TSeriesType.IsStructurallyEqual(const Other: IStaticType): Boolean;
begin
Result := (Assigned(Other)) and (Other.Kind = stSeries) and (Self.FElementType.IsEqual(Other.ElementType));
var uOther := TTypes.Unwrap(Other);
Result := (uOther.Kind = stSeries) and (Self.FElementType.IsEqual(uOther.ElementType));
end;
function TSeriesType.GetHashCode: Integer;
var
h: Integer;
begin
Result := Ord(stSeries);
// Seed with Kind, then mix in ElementType's hash
h := Ord(stSeries);
Result := THashBobJenkins.GetHashValue(h, SizeOf(TStaticTypeKind), 0);
if Assigned(FElementType) then
begin
var hash := FElementType.GetHashCode;
Result := THashBobJenkins.GetHashValue(Hash, SizeOf(Integer), Result);
h := FElementType.GetHashCode;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
end;
end;
@@ -323,18 +448,23 @@ end;
function TMethodSignature.GetHashCode: Integer;
var
i: Integer;
i, h: Integer;
begin
// Start with 0 (or a signature constant), mix ReturnType, then Params
Result := 0;
if Assigned(FReturnType) then
Result := FReturnType.GetHashCode;
begin
h := FReturnType.GetHashCode;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
end;
for i := 0 to High(FParamTypes) do
begin
if Assigned(FParamTypes[i]) then
begin
var hash := FParamTypes[i].GetHashCode;
Result := THashBobJenkins.GetHashValue(hash, SizeOf(Integer), Result);
h := FParamTypes[i].GetHashCode;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
end;
end;
end;
@@ -349,7 +479,7 @@ type
constructor Create(const ASignatures: TArray<IMethodSignature>);
function GetKind: TStaticTypeKind; override;
function GetSignatures: TArray<IMethodSignature>; override;
function IsEqual(const Other: IStaticType): Boolean; override;
function IsStructurallyEqual(const Other: IStaticType): Boolean; override;
function GetHashCode: Integer; override;
function ToString: string; override;
end;
@@ -386,14 +516,15 @@ begin
Result := Format('Method(%s): %s', [paramStr, Sig.ReturnType.ToString]);
end;
function TMethodType.IsEqual(const Other: IStaticType): Boolean;
function TMethodType.IsStructurallyEqual(const Other: IStaticType): Boolean;
var
i, j: Integer;
begin
if (not Assigned(Other)) or (Other.Kind <> stMethod) then
var uOther := TTypes.Unwrap(Other);
if (not Assigned(uOther)) or (uOther.Kind <> stMethod) then
exit(False);
var otherSigs := Other.Signatures;
var otherSigs := uOther.Signatures;
if Length(Self.FSignatures) <> Length(otherSigs) then
exit(False);
@@ -420,14 +551,18 @@ end;
function TMethodType.GetHashCode: Integer;
var
sig: IMethodSignature;
h: Integer;
begin
Result := Ord(stMethod);
// Seed with stMethod, then mix in each signature's hash
h := Ord(stMethod);
Result := THashBobJenkins.GetHashValue(h, SizeOf(TStaticTypeKind), 0);
for sig in FSignatures do
begin
if Assigned(sig) then
begin
var hash := sig.GetHashCode;
Result := THashBobJenkins.GetHashValue(hash, SizeOf(Integer), Result);
h := sig.GetHashCode;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
end;
end;
end;
@@ -471,7 +606,7 @@ type
constructor Create(AKind: TStaticTypeKind; ADef: IScalarRecordDefinition);
function GetKind: TStaticTypeKind; override;
function GetDefinition: IScalarRecordDefinition; override;
function IsEqual(const Other: IStaticType): Boolean; override;
function IsStructurallyEqual(const Other: IStaticType): Boolean; override;
function GetHashCode: Integer; override;
function ToString: string; override;
end;
@@ -494,14 +629,15 @@ begin
Result := FDefinition;
end;
function TRecordType.IsEqual(const Other: IStaticType): Boolean;
function TRecordType.IsStructurallyEqual(const Other: IStaticType): Boolean;
var
i: Integer;
begin
if (not Assigned(Other)) or (Other.Kind <> GetKind) then
var uOther := TTypes.Unwrap(Other);
if (not Assigned(uOther)) or (uOther.Kind <> GetKind) then
exit(False);
var otherDef := Other.Definition;
var otherDef := uOther.Definition;
if (not Assigned(Self.FDefinition)) or (not Assigned(otherDef)) then
exit(False);
@@ -519,19 +655,26 @@ end;
function TRecordType.GetHashCode: Integer;
var
i: Integer;
i, h: Integer;
field: TPair<IKeyword, TScalar.TKind>;
begin
Result := Ord(GetKind);
// Seed with Kind
Result := THashBobJenkins.GetHashValue(FKind, SizeOf(TStaticTypeKind), 0);
if Assigned(FDefinition) then
begin
for i := 0 to FDefinition.Count - 1 do
begin
field := FDefinition[i];
var hash := TEqualityComparer<IKeyword>.Default.GetHashCode(field.Key);
Result := THashBobJenkins.GetHashValue(hash, SizeOf(Pointer), Result);
var data := Ord(field.Value);
Result := THashBobJenkins.GetHashValue(data, SizeOf(Byte), Result);
// Hash Key
// Keyword identities are unique by pointer, but let's hash their internal ID/Index for safety
h := field.Key.Idx;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
// Hash Field Type Kind
h := Ord(field.Value);
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
end;
end;
end;
@@ -564,7 +707,7 @@ type
constructor Create(const ADef: IGenericRecordDefinition);
function GetKind: TStaticTypeKind; override;
function GetGenericDefinition: IGenericRecordDefinition; override;
function IsEqual(const Other: IStaticType): Boolean; override;
function IsStructurallyEqual(const Other: IStaticType): Boolean; override;
function GetHashCode: Integer; override;
function ToString: string; override;
end;
@@ -585,14 +728,15 @@ begin
Result := FDefinition;
end;
function TGenericRecordType.IsEqual(const Other: IStaticType): Boolean;
function TGenericRecordType.IsStructurallyEqual(const Other: IStaticType): Boolean;
var
i: Integer;
begin
if (not Assigned(Other)) or (Other.Kind <> stGenericRecord) then
var uOther := TTypes.Unwrap(Other);
if (not Assigned(uOther)) or (uOther.Kind <> stGenericRecord) then
exit(False);
var otherDef := Other.GenericDefinition;
var otherDef := uOther.GenericDefinition;
if (not Assigned(Self.FDefinition)) or (not Assigned(otherDef)) then
exit(False);
@@ -601,6 +745,7 @@ begin
for i := 0 to Self.FDefinition.Count - 1 do
begin
// Deep Check of Field Types
if (Self.FDefinition[i].Key <> otherDef[i].Key) or (not Self.FDefinition[i].Value.IsEqual(otherDef[i].Value)) then
exit(False);
end;
@@ -610,21 +755,27 @@ end;
function TGenericRecordType.GetHashCode: Integer;
var
i: Integer;
i, h: Integer;
field: TPair<IKeyword, IStaticType>;
begin
Result := Ord(stGenericRecord);
h := Ord(stGenericRecord);
Result := THashBobJenkins.GetHashValue(h, SizeOf(TStaticTypeKind), 0);
if Assigned(FDefinition) then
begin
for i := 0 to FDefinition.Count - 1 do
begin
field := FDefinition[i];
var data := TEqualityComparer<IKeyword>.Default.GetHashCode(field.Key);
Result := THashBobJenkins.GetHashValue(data, SizeOf(Pointer), Result);
// Hash Key (using Idx)
h := field.Key.Idx;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
// Hash Value Type
if Assigned(field.Value) then
begin
var hash := field.Value.GetHashCode;
Result := THashBobJenkins.GetHashValue(hash, SizeOf(Integer), Result);
h := field.Value.GetHashCode;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
end;
end;
end;
@@ -649,10 +800,66 @@ begin
Result := Result + '}';
end;
{ TTypes (Factory) }
// --- TMethodSigArrayComparer ---
type
TMethodSigArrayComparer = class(TEqualityComparer<TArray<IMethodSignature>>)
public
function Equals(const Left, Right: TArray<IMethodSignature>): Boolean; override;
function GetHashCode(const Value: TArray<IMethodSignature>): Integer; override;
end;
function TMethodSigArrayComparer.Equals(const Left, Right: TArray<IMethodSignature>): Boolean;
var
i, j: Integer;
begin
if Length(Left) <> Length(Right) then
exit(False);
for i := 0 to High(Left) do
begin
if not Left[i].ReturnType.IsEqual(Right[i].ReturnType) then
exit(False);
var pLeft := Left[i].ParamTypes;
var pRight := Right[i].ParamTypes;
if Length(pLeft) <> Length(pRight) then
exit(False);
for j := 0 to High(pLeft) do
if not pLeft[j].IsEqual(pRight[j]) then
exit(False);
end;
Result := True;
end;
function TMethodSigArrayComparer.GetHashCode(const Value: TArray<IMethodSignature>): Integer;
var
sig: IMethodSignature;
p: IStaticType;
h: Integer;
begin
Result := 0;
for sig in Value do
begin
if Assigned(sig.ReturnType) then
begin
h := sig.ReturnType.GetHashCode;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
end;
for p in sig.ParamTypes do
begin
h := p.GetHashCode;
Result := THashBobJenkins.GetHashValue(h, SizeOf(Integer), Result);
end;
end;
end;
{ TTypes Factory }
class constructor TTypes.Create;
begin
// 1. Primitives
FUnknown := TSimpleStaticType.Create(stUnknown);
FVoid := TSimpleStaticType.Create(stVoid);
FOrdinal := TSimpleStaticType.Create(stOrdinal);
@@ -661,42 +868,158 @@ begin
FDateTime := TSimpleStaticType.Create(stDateTime);
FText := TSimpleStaticType.Create(stText);
FKeyword := TSimpleStaticType.Create(stKeyword);
// 2. Optional Primitives (pre-cached)
FOrdinalOpt := TOptionalType.Create(FOrdinal);
FFloatOpt := TOptionalType.Create(FFloat);
FBooleanOpt := TOptionalType.Create(FBoolean);
FDateTimeOpt := TOptionalType.Create(FDateTime);
FTextOpt := TOptionalType.Create(FText);
FKeywordOpt := TOptionalType.Create(FKeyword);
// 3. Caches
FSeriesCache := TDictionary<IStaticType, IStaticType>.Create;
FRecordCache := TDictionary<IScalarRecordDefinition, IStaticType>.Create;
FRecordSeriesCache := TDictionary<IScalarRecordDefinition, IStaticType>.Create;
FGenericRecordCache := TDictionary<IGenericRecordDefinition, IStaticType>.Create;
FMethodCache := TDictionary<TArray<IMethodSignature>, IStaticType>.Create(TMethodSigArrayComparer.Create);
FOptionalCache := TDictionary<IStaticType, IStaticType>.Create;
end;
class destructor TTypes.Destroy;
begin
FSeriesCache.Free;
FRecordCache.Free;
FRecordSeriesCache.Free;
FGenericRecordCache.Free;
FMethodCache.Free;
FOptionalCache.Free;
end;
class function TTypes.CreateSeries(const AElementType: IStaticType): IStaticType;
begin
if not Assigned(AElementType) then
exit(FUnknown);
TMonitor.Enter(FSeriesCache);
try
if FSeriesCache.TryGetValue(AElementType, Result) then
exit;
Result := TSeriesType.Create(AElementType);
FSeriesCache.Add(AElementType, Result);
finally
TMonitor.Exit(FSeriesCache);
end;
end;
class function TTypes.CreateRecord(const ADef: IScalarRecordDefinition): IStaticType;
begin
TMonitor.Enter(FRecordCache);
try
if FRecordCache.TryGetValue(ADef, Result) then
exit;
Result := TRecordType.Create(stRecord, ADef);
FRecordCache.Add(ADef, Result);
finally
TMonitor.Exit(FRecordCache);
end;
end;
class function TTypes.CreateRecordSeries(const ADef: IScalarRecordDefinition): IStaticType;
begin
TMonitor.Enter(FRecordSeriesCache);
try
if FRecordSeriesCache.TryGetValue(ADef, Result) then
exit;
Result := TRecordType.Create(stRecordSeries, ADef);
FRecordSeriesCache.Add(ADef, Result);
finally
TMonitor.Exit(FRecordSeriesCache);
end;
end;
class function TTypes.CreateGenericRecord(const ADef: IGenericRecordDefinition): IStaticType;
begin
TMonitor.Enter(FGenericRecordCache);
try
if FGenericRecordCache.TryGetValue(ADef, Result) then
exit;
Result := TGenericRecordType.Create(ADef);
FGenericRecordCache.Add(ADef, Result);
finally
TMonitor.Exit(FGenericRecordCache);
end;
end;
class function TTypes.CreateMethod(const AParamTypes: TArray<IStaticType>; const AReturnType: IStaticType): IStaticType;
var
sig: IMethodSignature;
sigs: TArray<IMethodSignature>;
begin
sig := TMethodSignature.Create(AParamTypes, AReturnType);
SetLength(sigs, 1);
sigs[0] := sig;
Result := TMethodType.Create(sigs);
Result := CreateMethodSet([sig]);
end;
class function TTypes.CreateMethodSet(const ASignatures: TArray<IMethodSignature>): IStaticType;
begin
Result := TMethodType.Create(ASignatures);
if Length(ASignatures) = 0 then
exit(FUnknown);
TMonitor.Enter(FMethodCache);
try
if FMethodCache.TryGetValue(ASignatures, Result) then
exit;
Result := TMethodType.Create(ASignatures);
FMethodCache.Add(ASignatures, Result);
finally
TMonitor.Exit(FMethodCache);
end;
end;
class function TTypes.CreateRecord(const ADef: IScalarRecordDefinition): IStaticType;
class function TTypes.MakeOptional(const AType: IStaticType): IStaticType;
begin
Result := TRecordType.Create(stRecord, ADef);
if (not Assigned(AType)) or (AType.Kind = stUnknown) or (AType.Kind = stVoid) then
exit(AType);
if AType.IsOptional then
exit(AType);
// Fast-Path using pointer comparison on flyweights
if Pointer(AType) = Pointer(FOrdinal) then
exit(FOrdinalOpt);
if Pointer(AType) = Pointer(FFloat) then
exit(FFloatOpt);
if Pointer(AType) = Pointer(FBoolean) then
exit(FBooleanOpt);
if Pointer(AType) = Pointer(FText) then
exit(FTextOpt);
if Pointer(AType) = Pointer(FKeyword) then
exit(FKeywordOpt);
if Pointer(AType) = Pointer(FDateTime) then
exit(FDateTimeOpt);
TMonitor.Enter(FOptionalCache);
try
if FOptionalCache.TryGetValue(AType, Result) then
exit;
Result := TOptionalType.Create(AType);
FOptionalCache.Add(AType, Result);
finally
TMonitor.Exit(FOptionalCache);
end;
end;
class function TTypes.CreateRecordSeries(const ADef: IScalarRecordDefinition): IStaticType;
class function TTypes.Unwrap(const AType: IStaticType): IStaticType;
begin
Result := TRecordType.Create(stRecordSeries, ADef);
end;
class function TTypes.CreateGenericRecord(const ADef: IGenericRecordDefinition): IStaticType;
begin
Result := TGenericRecordType.Create(ADef);
end;
class function TTypes.CreateSeries(const AElementType: IStaticType): IStaticType;
begin
Result := TSeriesType.Create(AElementType);
if (Assigned(AType)) and (AType is TOptionalType) then
Result := (AType as TOptionalType).FInner
else
Result := AType;
end;
class function TTypes.FromScalarKind(AKind: TScalar.TKind): IStaticType;
@@ -708,7 +1031,6 @@ begin
TScalar.TKind.Boolean: Result := FBoolean;
TScalar.TKind.DateTime: Result := FDateTime;
else
Assert(False, 'Invalid Scalar Kind');
Result := nil;
end;
end;
@@ -723,22 +1045,26 @@ begin
if (Target.Kind = stUnknown) or (Source.Kind = stUnknown) then
exit(True);
if Target.IsEqual(Source) then
// STRICTNESS RULE: Cannot assign Optional to Non-Optional
if Source.IsOptional and (not Target.IsOptional) then
exit(False);
var uTarget := TTypes.Unwrap(Target);
var uSource := TTypes.Unwrap(Source);
if uTarget.IsStructurallyEqual(uSource) then
exit(True);
if (Target.Kind = stFloat) and (Source.Kind = stOrdinal) then
// Auto-Promotion rules
if (uTarget.Kind = stFloat) and (uSource.Kind = stOrdinal) then
exit(True);
if (Target.Kind = stOrdinal) and (Source.Kind = stBoolean) then
if (uTarget.Kind = stOrdinal) and (uSource.Kind = stBoolean) then
exit(True);
if (Target.Kind = stFloat) and (Source.Kind = stDateTime) then
if (uTarget.Kind = stFloat) and (uSource.Kind = stDateTime) then
exit(True);
if (Target.Kind = stVoid) and (Source.Kind = stMethod) then
if (uTarget.Kind = stVoid) and (uSource.Kind = stMethod) then
exit(True);
if (Target.Kind = stOrdinal) and (Source.Kind = stKeyword) then
if (uTarget.Kind = stOrdinal) and (uSource.Kind = stKeyword) then
exit(True);
Result := False;
@@ -746,49 +1072,57 @@ end;
class function TTypeRules.Promote(const A, B: IStaticType): IStaticType;
begin
// Handle Unknown: If one is Unknown, the result is the other type.
if A.Kind = stUnknown then
exit(B);
if B.Kind = stUnknown then
exit(A);
// all operations involving void result void
if (A.Kind = stVoid) or (B.Kind = stVoid) then
// T + Void -> T?
if (A.Kind = stVoid) and (B.Kind <> stVoid) then
exit(TTypes.MakeOptional(B));
if (B.Kind = stVoid) and (A.Kind <> stVoid) then
exit(TTypes.MakeOptional(A));
if (A.Kind = stVoid) and (B.Kind = stVoid) then
exit(TTypes.Void);
// Standard Numeric promotion rule: Float wins
if (A.Kind = stFloat) and (B.Kind = stFloat) then
exit(TTypes.Float);
if (A.Kind = stFloat) and (B.Kind = stOrdinal) then
exit(TTypes.Float);
if (A.Kind = stOrdinal) and (B.Kind = stFloat) then
exit(TTypes.Float);
if (A.Kind = stOrdinal) and (B.Kind = stOrdinal) then
exit(TTypes.Ordinal);
var uA := TTypes.Unwrap(A);
var uB := TTypes.Unwrap(B);
var common: IStaticType := nil;
// If types are identical, return that type.
if A.IsEqual(B) then
exit(A);
if uA.IsStructurallyEqual(uB) then
common := uA
else if (uA.Kind = stFloat) and (uB.Kind = stFloat) then
common := TTypes.Float
else if (uA.Kind = stFloat) and (uB.Kind = stOrdinal) then
common := TTypes.Float
else if (uA.Kind = stOrdinal) and (uB.Kind = stFloat) then
common := TTypes.Float
else if (uA.Kind = stOrdinal) and (uB.Kind = stOrdinal) then
common := TTypes.Ordinal;
// No promotion possible
Result := nil;
if common = nil then
exit(nil);
if A.IsOptional or B.IsOptional then
Result := TTypes.MakeOptional(common)
else
Result := common;
end;
class function TTypeRules.ResolveBinaryOp(Op: TScalar.TBinaryOp; const Left, Right: IStaticType): IStaticType;
var
promotedType: IStaticType;
promotedKind: TStaticTypeKind;
begin
promotedType := Promote(Left, Right);
// Mismatch during promotion
if not Assigned(promotedType) then
if Left.IsOptional or Right.IsOptional then
exit(nil);
var promotedType := Promote(Left, Right);
if not Assigned(promotedType) then
exit(nil);
if promotedType.Kind = stUnknown then
exit(TTypes.Unknown);
promotedKind := promotedType.Kind;
var promotedKind := promotedType.Kind;
case Op of
TScalar.TBinaryOp.Add, TScalar.TBinaryOp.Subtract, TScalar.TBinaryOp.Multiply:
@@ -819,17 +1153,16 @@ begin
Result := TTypes.Boolean;
end;
else
// Operation not supported at the AST level (might need folding later, but here it implies invalid usage)
Result := nil;
end;
end;
class function TTypeRules.ResolveUnaryOp(Op: TScalar.TUnaryOp; const Right: IStaticType): IStaticType;
var
rightKind: TStaticTypeKind;
begin
rightKind := Right.Kind;
if Right.IsOptional then
exit(nil);
var rightKind := Right.Kind;
if rightKind = stUnknown then
exit(TTypes.Unknown);
Src/AST/Myc.Ast.pas
+6 -1
View File
@@ -560,7 +560,12 @@ begin
var paramList := TParameterList.Create(AParameters, listId);
var id := TIdentities.Structural(Loc);
Result := TLambdaExpressionNode.Create(paramList, ABody, TTypes.Unknown, nil, nil, nil, False, False, id);
var body := ABody;
if body = nil then
body := Block([]);
Result := TLambdaExpressionNode.Create(paramList, body, TTypes.Unknown, nil, nil, nil, False, False, id);
end;
class function TAst.LambdaExpr(