internal override ScriptValue Get(ScriptValue property, ScriptValue reciever)
{
//https://tc39.github.io/ecma262/#sec-arguments-exotic-objects-get-p-receiver
var isMapped = ParameterMap.HasOwnProperty(property);
if (!isMapped)
{
return(base.Get(property, reciever));
}
return(ParameterMap.Get(property, ParameterMap));
}
internal override bool Delete(ScriptValue property)
{
//https://tc39.github.io/ecma262/#sec-arguments-exotic-objects-delete-p
var isMapped = ParameterMap.HasOwnProperty(property);
var result = base.Delete(property);
if (result && isMapped)
{
ParameterMap.Delete(property);
}
return(result);
}
internal override bool DefineOwnProperty(ScriptValue property, PropertyDescriptor descriptor)
{
//https://tc39.github.io/ecma262/#sec-arguments-exotic-objects-defineownproperty-p-desc
var isMapped = ParameterMap.HasOwnProperty(property);
var newArgumentDescriptor = descriptor;
if (isMapped && descriptor.IsDataDescriptor)
{
if (!descriptor.Value.HasValue && descriptor.Writable.HasValue && !descriptor.Writable)
{
newArgumentDescriptor = new PropertyDescriptor(ParameterMap.Get(property), descriptor.Writable, descriptor.Enumerable, descriptor.Configurable);
}
}
var allowed = base.DefineOwnProperty(property, newArgumentDescriptor);
if (!allowed)
{
return(false);
}
if (isMapped)
{
if (descriptor.IsAccessorDescriptor)
{
ParameterMap.Delete(property);
}
else
{
if (descriptor.Value.HasValue)
{
var setStatus = Agent.Set(ParameterMap, property, descriptor.Value.Value, false);
Debug.Assert(setStatus);
}
if (descriptor.Writable.HasValue && !descriptor.Writable)
{
ParameterMap.Delete(property);
}
}
}
return(true);
}
internal override bool Set(ScriptValue property, ScriptValue value, ScriptValue receiver)
{
//https://tc39.github.io/ecma262/#sec-arguments-exotic-objects-set-p-v-receiver
var isMapped = false;
if (this == receiver)
{
isMapped = ParameterMap.HasOwnProperty(property);
}
if (isMapped)
{
var setStatus = Agent.Set(ParameterMap, property, value, false);
Debug.Assert(setStatus);
}
return(base.Set(property, value, receiver));
}
internal override PropertyDescriptor GetOwnProperty(ScriptValue property)
{
//https://tc39.github.io/ecma262/#sec-arguments-exotic-objects-getownproperty-p
var descriptor = base.GetOwnProperty(property);
if (descriptor == null)
{
return(null);
}
var isMapped = ParameterMap.HasOwnProperty(property);
if (isMapped)
{
descriptor.Value = ParameterMap.Get(property, ParameterMap);
}
return(descriptor);
}
