5dd5896588
This is a continuation of the previous commit. Calling initialize() is the first thing that's done after allocating a cell on the JS heap - and in the common case of allocating an object, that's where properties are assigned and intrinsics occasionally accessed. Since those are supposed to live on the realm eventually, this is another step into that direction.
100 lines
3.8 KiB
C++
100 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/ProxyConstructor.h>
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#include <LibJS/Runtime/ProxyObject.h>
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namespace JS {
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// 10.5.14 ProxyCreate ( target, handler ), https://tc39.es/ecma262/#sec-proxycreate
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static ThrowCompletionOr<ProxyObject*> proxy_create(GlobalObject& global_object, Value target, Value handler)
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{
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auto& vm = global_object.vm();
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if (!target.is_object())
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return vm.throw_completion<TypeError>(global_object, ErrorType::ProxyConstructorBadType, "target", target.to_string_without_side_effects());
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if (!handler.is_object())
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return vm.throw_completion<TypeError>(global_object, ErrorType::ProxyConstructorBadType, "handler", handler.to_string_without_side_effects());
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return ProxyObject::create(global_object, target.as_object(), handler.as_object());
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}
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ProxyConstructor::ProxyConstructor(Realm& realm)
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: NativeFunction(vm().names.Proxy.as_string(), *realm.global_object().function_prototype())
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{
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}
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void ProxyConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(realm);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(vm.names.revocable, revocable, 2, attr);
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define_direct_property(vm.names.length, Value(2), Attribute::Configurable);
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}
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// 28.2.1.1 Proxy ( target, handler ), https://tc39.es/ecma262/#sec-proxy-target-handler
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ThrowCompletionOr<Value> ProxyConstructor::call()
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{
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auto& vm = this->vm();
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return vm.throw_completion<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.Proxy);
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}
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// 28.2.1.1 Proxy ( target, handler ), https://tc39.es/ecma262/#sec-proxy-target-handler
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ThrowCompletionOr<Object*> ProxyConstructor::construct(FunctionObject&)
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{
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auto& vm = this->vm();
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return TRY(proxy_create(global_object(), vm.argument(0), vm.argument(1)));
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}
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// 28.2.2.1 Proxy.revocable ( target, handler ), https://tc39.es/ecma262/#sec-proxy.revocable
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JS_DEFINE_NATIVE_FUNCTION(ProxyConstructor::revocable)
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{
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// 1. Let p be ? ProxyCreate(target, handler).
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auto* proxy = TRY(proxy_create(global_object, vm.argument(0), vm.argument(1)));
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// 2. Let revokerClosure be a new Abstract Closure with no parameters that captures nothing and performs the following steps when called:
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auto revoker_closure = [proxy_handle = make_handle(proxy)](auto&, auto&) -> ThrowCompletionOr<Value> {
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// a. Let F be the active function object.
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// b. Let p be F.[[RevocableProxy]].
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auto& proxy = const_cast<ProxyObject&>(*proxy_handle.cell());
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// c. If p is null, return undefined.
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if (proxy.is_revoked())
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return js_undefined();
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// d. Set F.[[RevocableProxy]] to null.
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// e. Assert: p is a Proxy object.
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// f. Set p.[[ProxyTarget]] to null.
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// g. Set p.[[ProxyHandler]] to null.
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proxy.revoke();
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// h. Return undefined.
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return js_undefined();
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};
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// 3. Let revoker be CreateBuiltinFunction(revokerClosure, 0, "", « [[RevocableProxy]] »).
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// 4. Set revoker.[[RevocableProxy]] to p.
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auto* revoker = NativeFunction::create(global_object, move(revoker_closure), 0, "");
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// 5. Let result be OrdinaryObjectCreate(%Object.prototype%).
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auto* result = Object::create(global_object, global_object.object_prototype());
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// 6. Perform ! CreateDataPropertyOrThrow(result, "proxy", p).
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MUST(result->create_data_property_or_throw(vm.names.proxy, proxy));
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// 7. Perform ! CreateDataPropertyOrThrow(result, "revoke", revoker).
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MUST(result->create_data_property_or_throw(vm.names.revoke, revoker));
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// 8. Return result.
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return result;
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}
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}
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