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unit jsbase;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
Type
TJSType = (jstUNDEFINED,jstNull,jstBoolean,jstNumber,jstString,jstObject,jstReference,JSTCompletion);
TJSString = WideString;
TJSNumber = Double;
{ TJSValue }
TJSValue = Class(TObject)
private
FValueType: TJSType;
FValue : Record
Case Integer of
0 : (P : Pointer);
1 : (F : TJSNumber);
2 : (I : Integer);
end;
procedure ClearValue(ANewValue: TJSType);
function GetAsBoolean: Boolean;
function GetAsCompletion: TObject;
function GetAsNumber: TJSNumber;
function GetAsObject: TObject;
function GetAsReference: TObject;
function GetAsString: TJSString;
function GetIsNull: Boolean;
function GetIsUndefined: Boolean;
procedure SetAsBoolean(const AValue: Boolean);
procedure SetAsCompletion(const AValue: TObject);
procedure SetAsNumber(const AValue: TJSNumber);
procedure SetAsObject(const AValue: TObject);
procedure SetAsReference(const AValue: TObject);
procedure SetAsString(const AValue: TJSString);
procedure SetIsNull(const AValue: Boolean);
procedure SetIsUndefined(const AValue: Boolean);
Public
Destructor Destroy; override;
Property ValueType : TJSType Read FValueType;
Property IsUndefined : Boolean Read GetIsUndefined Write SetIsUndefined;
Property IsNull : Boolean Read GetIsNull Write SetIsNull;
Property AsNumber : TJSNumber Read GetAsNumber Write SetAsNumber;
Property AsBoolean : Boolean Read GetAsBoolean Write SetAsBoolean;
Property AsObject : TObject Read GetAsObject Write SetAsObject;
Property AsString : TJSString Read GetAsString Write SetAsString;
Property AsReference : TObject Read GetAsReference Write SetAsReference;
Property AsCompletion : TObject Read GetAsCompletion Write SetAsCompletion;
end;
implementation
{ TJSValue }
function TJSValue.GetAsBoolean: Boolean;
begin
If (ValueType=jstBoolean) then
Result:=(FValue.I<>0)
else
Result:=False;
end;
function TJSValue.GetAsCompletion: TObject;
begin
Result:=TObject(FValue.P);
end;
function TJSValue.GetAsNumber: TJSNumber;
begin
If (ValueType=jstNumber) then
Result:=FValue.F;
end;
function TJSValue.GetAsObject: TObject;
begin
If (ValueType=jstObject) then
Result:=TObject(FValue.P);
end;
function TJSValue.GetAsReference: TObject;
begin
If (ValueType=jstReference) then
Result:=TObject(FValue.P);
end;
function TJSValue.GetAsString: TJSString;
begin
If (ValueType=jstString) then
Result:=String(FValue.P);
end;
function TJSValue.GetIsNull: Boolean;
begin
Result:=(ValueType=jstNull);
end;
function TJSValue.GetIsUndefined: Boolean;
begin
Result:=(fValueType=jstUndefined);
end;
procedure TJSValue.ClearValue(ANewValue : TJSType);
begin
Case FValueType of
jstString : String(FValue.P):='';
jstNumber : FValue.F:=0;
else
FValue.I:=0;
end;
FValueType:=ANewValue;
end;
procedure TJSValue.SetAsBoolean(const AValue: Boolean);
begin
ClearValue(jstBoolean);
FValue.I:=Ord(AValue);
end;
procedure TJSValue.SetAsCompletion(const AValue: TObject);
begin
ClearValue(jstBoolean);
FValue.P:=AValue;
end;
procedure TJSValue.SetAsNumber(const AValue: TJSNumber);
begin
ClearValue(jstNumber);
FValue.F:=AValue;
end;
procedure TJSValue.SetAsObject(const AValue: TObject);
begin
ClearValue(jstObject);
FValue.P:=AVAlue;
end;
procedure TJSValue.SetAsReference(const AValue: TObject);
begin
ClearValue(jstReference);
FValue.P:=AVAlue;
end;
procedure TJSValue.SetAsString(const AValue: TJSString);
begin
ClearValue(jstString);
String(FValue.P):=AValue;
end;
procedure TJSValue.SetIsNull(const AValue: Boolean);
begin
ClearValue(jstNull);
end;
procedure TJSValue.SetIsUndefined(const AValue: Boolean);
begin
ClearValue(jstUndefined);
end;
destructor TJSValue.Destroy;
begin
ClearValue(jstUndefined);
inherited Destroy;
end;
end.
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