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Proxy.winxed
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Proxy.winxed
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namespace Rosella.Proxy
{
// Determine if an object is secretly a proxy.
function is_proxy(var obj)
{
int is_p = 0;
try {
var factory = get_proxy_private_attr(obj, "proxy_factory");
if (factory != null)
is_p = Rosella.isa_type(class Rosella.Proxy.Factory, factory);
} catch (e) {
is_p = 0;
}
return is_p;
}
// Get a name for the attribute which contains special characters
// that are unlikely to be used by the object systems in any HLLs
function get_private_attr_name(string attr)
{
return "!!!" + attr;
}
// Add a private proxy attribute to the proxy class
function add_proxy_class_private_attr(var proxy_class, string attr)
{
attr = get_private_attr_name(attr);
proxy_class.add_attribute(attr);
}
// The 4-argument getattribute and setattribute ops point to the
// [get|set]_attr_keyed vtable, which cannot be overridden
function get_proxy_private_attr(var proxy, string attr)
{
attr = get_private_attr_name(attr);
var class_obj = typeof(proxy);
var value = getattribute_private(proxy, class_obj, attr);
return value;
}
// Set the value of a private proxy attribute
function set_proxy_private_attr(var proxy, string attr, var value)
{
attr = get_private_attr_name(attr);
setattribute_private(proxy, typeof(proxy), attr, value);
}
// Add a vtable override
function add_vtable_override(var proxy_class, string name, var override)
{
var overrides = inspect_named(proxy_class, "vtable_overrides");
overrides[name] = override;
}
}