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LibJS: Add spec comments to ProxyConstructor
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1 changed files with 24 additions and 2 deletions
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@ -17,10 +17,24 @@ namespace JS {
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static ThrowCompletionOr<ProxyObject*> proxy_create(VM& vm, Value target, Value handler)
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{
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auto& realm = *vm.current_realm();
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// 1. If target is not an Object, throw a TypeError exception.
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if (!target.is_object())
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return vm.throw_completion<TypeError>(ErrorType::ProxyConstructorBadType, "target", TRY_OR_THROW_OOM(vm, target.to_string_without_side_effects()));
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// 2. If handler is not an Object, throw a TypeError exception.
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if (!handler.is_object())
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return vm.throw_completion<TypeError>(ErrorType::ProxyConstructorBadType, "handler", TRY_OR_THROW_OOM(vm, handler.to_string_without_side_effects()));
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// 3. Let P be MakeBasicObject(« [[ProxyHandler]], [[ProxyTarget]] »).
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// 4. Set P's essential internal methods, except for [[Call]] and [[Construct]], to the definitions specified in 10.5.
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// 5. IsCallable(target) is true, then
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// a. Set P.[[Call]] as specified in 10.5.12.
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// b. If IsConstructor(target) is true, then
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// i. Set P.[[Construct]] as specified in 10.5.13.
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// 6. Set P.[[ProxyTarget]] to target.
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// 7. Set P.[[ProxyHandler]] to handler.
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// 8. Return P.
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return ProxyObject::create(realm, target.as_object(), handler.as_object()).ptr();
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}
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@ -45,6 +59,8 @@ ThrowCompletionOr<void> ProxyConstructor::initialize(Realm& realm)
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ThrowCompletionOr<Value> ProxyConstructor::call()
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{
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auto& vm = this->vm();
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// 1. If NewTarget is undefined, throw a TypeError exception.
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return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.Proxy);
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}
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@ -52,16 +68,22 @@ ThrowCompletionOr<Value> ProxyConstructor::call()
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ThrowCompletionOr<NonnullGCPtr<Object>> ProxyConstructor::construct(FunctionObject&)
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{
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auto& vm = this->vm();
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return *TRY(proxy_create(vm, vm.argument(0), vm.argument(1)));
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auto target = vm.argument(0);
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auto handler = vm.argument(1);
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// 2. Return ? ProxyCreate(target, handler).
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return *TRY(proxy_create(vm, target, handler));
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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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auto& realm = *vm.current_realm();
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auto target = vm.argument(0);
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auto handler = vm.argument(1);
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// 1. Let p be ? ProxyCreate(target, handler).
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auto* proxy = TRY(proxy_create(vm, vm.argument(0), vm.argument(1)));
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auto* proxy = TRY(proxy_create(vm, target, handler));
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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&) -> ThrowCompletionOr<Value> {
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