internal override bool SetPrototypeOf(ScriptObject prototype)
{
//https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-setprototypeof-v
if (ProxyHandler == null)
{
throw Agent.CreateTypeError();
}
Debug.Assert(ProxyTarget != null, nameof(ProxyTarget) + " != null");
var trap = Agent.GetMethod(ProxyHandler, "setPrototypeOf");
if (trap == null)
{
return(ProxyTarget.SetPrototypeOf(prototype));
}
var booleanTrapResult = Agent.ToBoolean(Agent.Call(trap, ProxyHandler, ProxyTarget, prototype));
if (!booleanTrapResult)
{
return(false);
}
var extensibleTarget = ProxyTarget.IsExtensible;
if (extensibleTarget)
{
return(true);
}
var targetPrototype = ProxyTarget.GetPrototypeOf();
if (prototype != targetPrototype)
{
throw Agent.CreateTypeError();
}
return(true);
}
internal override ScriptObject GetPrototypeOf()
{
//https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-getprototypeof
if (ProxyHandler == null)
{
throw Agent.CreateTypeError();
}
Debug.Assert(ProxyTarget != null, nameof(ProxyTarget) + " != null");
var trap = Agent.GetMethod(ProxyHandler, "getPrototypeOf");
if (trap == null)
{
return(ProxyTarget.GetPrototypeOf());
}
var handlerPrototype = Agent.Call(trap, ProxyHandler, ProxyTarget);
if (handlerPrototype != ScriptValue.Null && !handlerPrototype.IsObject)
{
throw Agent.CreateTypeError();
}
var extensibleTarget = ProxyTarget.IsExtensible;
if (extensibleTarget)
{
return(handlerPrototype == ScriptValue.Null ? null : (ScriptObject)handlerPrototype);
}
var targetPrototype = ProxyTarget.GetPrototypeOf();
if (!handlerPrototype.SameValue(targetPrototype))
{
throw Agent.CreateTypeError();
}
return(handlerPrototype == ScriptValue.Null ? null : (ScriptObject)handlerPrototype);
}
