internal static IRef createSpecial(Context cx, object obj, string name)
{
IScriptable target = ScriptConvert.ToObjectOrNull(cx, obj);
if (target == null)
{
throw ScriptRuntime.UndefReadError(obj, name);
}
Types type;
if (name.Equals("__proto__"))
{
type = Types.Proto;
}
else if (name.Equals("__parent__"))
{
type = Types.Parent;
}
else
{
throw new ArgumentException(name);
}
if (!cx.HasFeature(Context.Features.ParentProtoProperties))
{
// Clear special after checking for valid name!
type = Types.None;
}
return(new SpecialRef(target, type, name));
}
public IdEnumeration(object value, Context cx, bool enumValues)
{
obj = ScriptConvert.ToObjectOrNull(cx, value);
if (obj != null)
{
// null or undefined do not cause errors but rather lead to empty
// "for in" loop
this.enumValues = enumValues;
// enumInit should read all initial ids before returning
// or "for (a.i in a)" would wrongly enumerate i in a as well
ChangeObject();
}
}
public object Set(Context cx, object value)
{
switch (type)
{
case Types.None:
return(ScriptRuntime.setObjectProp(target, name, value, cx));
case Types.Proto:
case Types.Parent: {
IScriptable obj = ScriptConvert.ToObjectOrNull(cx, value);
if (obj != null)
{
// Check that obj does not contain on its prototype/scope
// chain to prevent cycles
IScriptable search = obj;
do
{
if (search == target)
{
throw Context.ReportRuntimeErrorById("msg.cyclic.value", name);
}
if (type == Types.Proto)
{
search = search.GetPrototype();
}
else
{
search = search.ParentScope;
}
}while (search != null);
}
if (type == Types.Proto)
{
target.SetPrototype(obj);
}
else
{
target.ParentScope = obj;
}
return(obj);
}
default:
throw Context.CodeBug();
}
}
