public FunctionEnvironment([NotNull] ScriptFunctionObject function, ThisBindingStatus thisBindingStatus, ScriptObject homeObject, ScriptObject newTarget) :
base(function.Agent)
{
FunctionObject = function;
this.thisBindingStatus = thisBindingStatus;
this.homeObject = homeObject;
NewTarget = newTarget;
}
public JsValue BindThisValue(JsValue value)
{
if (_thisBindingStatus == ThisBindingStatus.Initialized)
{
ExceptionHelper.ThrowReferenceError <JsValue>(_engine);
}
_thisValue = value;
_thisBindingStatus = ThisBindingStatus.Initialized;
return(value);
}
public JsValue BindThisValue(JsValue value)
{
if (_thisBindingStatus == ThisBindingStatus.Initialized)
{
ExceptionHelper.ThrowReferenceError(_functionObject._realm, (string)null);
}
_thisValue = value;
_thisBindingStatus = ThisBindingStatus.Initialized;
return(value);
}
public void BindThisValue(ScriptValue value)
{
//https://tc39.github.io/ecma262/#sec-bindthisvalue
Debug.Assert(thisBindingStatus != ThisBindingStatus.Lexical);
if (thisBindingStatus == ThisBindingStatus.Initialised)
{
throw FunctionObject.Agent.CreateReferenceError();
}
thisValue = value;
thisBindingStatus = ThisBindingStatus.Initialised;
}
public FunctionEnvironmentRecord(
Engine engine,
FunctionInstance functionObject,
JsValue newTarget) : base(engine)
{
_functionObject = functionObject;
_newTarget = newTarget;
if (functionObject is ArrowFunctionInstance)
{
_thisBindingStatus = ThisBindingStatus.Lexical;
}
else
{
_thisBindingStatus = ThisBindingStatus.Uninitialized;
}
}
