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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Object_;
interface
{$IF Defined(CHARTA_PASCAL)}
uses
Boolean,
Character.String_,
Integer._32.Positive,
Memory.Pointer,
System.Class_.Property_;
type
PMethodInformation = ^TMethodInformation;
TMethodInformation = record
public
Name: TAnsiString;
Address: TPointer;
end;
type
TClass = class of TObject;
TObject = class
private
class var
FSuperclass: TClass;
FInstanceSize: TPositiveInteger32;
FClassName: TAnsiString;
FQualifiedClassName: TAnsiString;
private
FClass: TClass;
public
constructor Create();
destructor Destroy(); virtual;
procedure AfterConstruction(); virtual;
procedure BeforeDestruction(); virtual;
procedure CleanupInstance();
procedure FreeInstance(); virtual;
procedure Free();
property Class_: TClass read FClass;
public
class var
Manager: TObject; // TODO: This should be a TValueManager
Methods: array of TMethodInformation;
Properties: TPropertyArray;
TypeParameters: array of TObject; // TODO: This should be array of TType
class function GetMethodInformation(const Name: TAnsiString): PMethodInformation;
class function InheritsFrom(Class_: TClass): TBoolean;
class property Superclass: TClass read FSuperclass;
class property InstanceSize: TPositiveInteger32 read FInstanceSize;
class property ClassName: TAnsiString read FClassName;
class property QualifiedClassName: TAnsiString read FQualifiedClassName;
public
// The following functions are for Delphi compatibility
class function MethodAddress(const Name: TAnsiString): Pointer;
class function ClassParent(): TClass;
public
function ClassType(): TClass;
end;
TMethod = record
public
Code: TPointer;
Data: TObject;
end;
function ClassCreate(Class_: TClass; Allocate: TBoolean): TObject;
procedure ClassDestroy(Instance: TObject; Deallocate: TBoolean);
function AsClass(Instance: TObject; Class_: TClass): TPointer;
function IsClass(Instance: TObject; Class_: TClass): TBoolean;
procedure AbstractError();
{$ENDIF}
implementation
{$IF Defined(CHARTA_PASCAL)}
uses
Exception,
Integer._32,
System.Class_.Exception,
Text,
Text.Collation,
Value.Manager;
function ClassCreate(Class_: TClass; Allocate: TBoolean): TObject;
begin
if Allocate then
begin
GetMem(TPointer(Result), Class_.InstanceSize);
FillChar(TPointer(Result)^, Class_.InstanceSize, 0);
Result.FClass := Class_;
end
else
Result := TObject(Class_);
end;
procedure ClassDestroy(Instance: TObject; Deallocate: TBoolean);
begin
if Deallocate then
Instance.FreeInstance();
end;
function AsClass(Instance: TObject; Class_: TClass): TPointer;
begin
if (Instance = nil) or (Instance is Class_) then
Result := Instance
else
raise EClassCast.Create('Cannot cast class ''' + Instance.ClassName + ''' to ''' + Class_.ClassName + '''');
end;
function IsClass(Instance: TObject; Class_: TClass): TBoolean;
begin
Result := (Instance <> nil) and Instance.Class_.InheritsFrom(Class_);
end;
procedure AbstractError();
begin
raise EAbstractMethodCalled.Create('Abstract method called');
end;
{ TObject }
procedure TObject.AfterConstruction();
begin
end;
procedure TObject.BeforeDestruction();
begin
end;
class function TObject.ClassParent(): TClass;
begin
Result := Superclass;
end;
function TObject.ClassType(): TClass;
begin
Result := Class_;
end;
procedure TObject.CleanupInstance();
var
Manager: TValueManager;
Class_: TClass;
begin
Class_ := Self.Class_;
while Class_ <> nil do
begin
Manager := Class_.Manager as TValueManager;
Manager.ReleaseReference(TPointer(Self)^);
Class_ := Class_.Superclass;
end;
end;
constructor TObject.Create();
begin
end;
destructor TObject.Destroy();
begin
end;
procedure TObject.Free();
begin
if Self <> nil then
Destroy();
end;
procedure TObject.FreeInstance();
begin
CleanupInstance();
FreeMem(TPointer(Self));
end;
class function TObject.GetMethodInformation(const Name: TAnsiString): PMethodInformation;
var
i: TInteger32;
MethodInformation: PMethodInformation;
NameText: TText; // TODO: We should in fact accept a Name: TText parameter
begin
Result := nil;
i := 0;
NameText := Name;
while (Result = nil) and (i < Length(Methods)) do
begin
MethodInformation := @Methods[i];
if TTextCollation.DefaultCaseInsensitive.Equal(NameText, MethodInformation.Name) then
Result := MethodInformation
else
Inc(i);
end;
if (Result = nil) and (Superclass <> nil) then
Result := Superclass.GetMethodInformation(Name);
end;
class function TObject.InheritsFrom(Class_: TClass): TBoolean;
var
Superclass: TClass;
begin
Result := False;
Superclass := Self;
while not Result and (Superclass <> nil) do
begin
Result := Superclass = Class_;
Superclass := Superclass.Superclass;
end;
end;
class function TObject.MethodAddress(const Name: TAnsiString): Pointer;
var
MethodInformation: PMethodInformation;
begin
MethodInformation := GetMethodInformation(Name);
if MethodInformation <> nil then
Result := MethodInformation.Address
else
Result := nil;
end;
{$ENDIF}
end.
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