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/*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/ProxyConstructor.h>
#include <LibJS/Runtime/ProxyObject.h>
namespace JS {
// 10.5.14 ProxyCreate ( target, handler ), https://tc39.es/ecma262/#sec-proxycreate
static ThrowCompletionOr<ProxyObject*> proxy_create(VM& vm, Value target, Value handler)
{
auto& realm = *vm.current_realm();
if (!target.is_object())
return vm.throw_completion<TypeError>(ErrorType::ProxyConstructorBadType, "target", target.to_string_without_side_effects());
if (!handler.is_object())
return vm.throw_completion<TypeError>(ErrorType::ProxyConstructorBadType, "handler", handler.to_string_without_side_effects());
return ProxyObject::create(realm, target.as_object(), handler.as_object());
}
ProxyConstructor::ProxyConstructor(Realm& realm)
: NativeFunction(vm().names.Proxy.as_string(), *realm.global_object().function_prototype())
{
}
void ProxyConstructor::initialize(Realm& realm)
{
auto& vm = this->vm();
NativeFunction::initialize(realm);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(vm.names.revocable, revocable, 2, attr);
define_direct_property(vm.names.length, Value(2), Attribute::Configurable);
}
// 28.2.1.1 Proxy ( target, handler ), https://tc39.es/ecma262/#sec-proxy-target-handler
ThrowCompletionOr<Value> ProxyConstructor::call()
{
auto& vm = this->vm();
return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.Proxy);
}
// 28.2.1.1 Proxy ( target, handler ), https://tc39.es/ecma262/#sec-proxy-target-handler
ThrowCompletionOr<Object*> ProxyConstructor::construct(FunctionObject&)
{
auto& vm = this->vm();
return TRY(proxy_create(vm, vm.argument(0), vm.argument(1)));
}
// 28.2.2.1 Proxy.revocable ( target, handler ), https://tc39.es/ecma262/#sec-proxy.revocable
JS_DEFINE_NATIVE_FUNCTION(ProxyConstructor::revocable)
{
auto& realm = *vm.current_realm();
// 1. Let p be ? ProxyCreate(target, handler).
auto* proxy = TRY(proxy_create(vm, vm.argument(0), vm.argument(1)));
// 2. Let revokerClosure be a new Abstract Closure with no parameters that captures nothing and performs the following steps when called:
auto revoker_closure = [proxy_handle = make_handle(proxy)](auto&) -> ThrowCompletionOr<Value> {
// a. Let F be the active function object.
// b. Let p be F.[[RevocableProxy]].
auto& proxy = const_cast<ProxyObject&>(*proxy_handle.cell());
// c. If p is null, return undefined.
if (proxy.is_revoked())
return js_undefined();
// d. Set F.[[RevocableProxy]] to null.
// e. Assert: p is a Proxy object.
// f. Set p.[[ProxyTarget]] to null.
// g. Set p.[[ProxyHandler]] to null.
proxy.revoke();
// h. Return undefined.
return js_undefined();
};
// 3. Let revoker be CreateBuiltinFunction(revokerClosure, 0, "", « [[RevocableProxy]] »).
// 4. Set revoker.[[RevocableProxy]] to p.
auto* revoker = NativeFunction::create(realm, move(revoker_closure), 0, "");
// 5. Let result be OrdinaryObjectCreate(%Object.prototype%).
auto* result = Object::create(realm, realm.global_object().object_prototype());
// 6. Perform ! CreateDataPropertyOrThrow(result, "proxy", p).
MUST(result->create_data_property_or_throw(vm.names.proxy, proxy));
// 7. Perform ! CreateDataPropertyOrThrow(result, "revoke", revoker).
MUST(result->create_data_property_or_throw(vm.names.revoke, revoker));
// 8. Return result.
return result;
}
}
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