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LibJS: Implement Object.freeze() and Object.seal()

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Linus Groh 2021-04-06 22:06:11 +02:00 • committed by Andreas Kling
parent 1c3eef5317
commit 9af07c7803
8 changed files with 202 additions and 3 deletions
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43
Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020-2021, Linus Groh <mail@linusgroh.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -55,6 +56,8 @@ void ObjectConstructor::initialize(GlobalObject& global_object)
define_native_function(vm.names.setPrototypeOf, set_prototype_of, 2, attr);
define_native_function(vm.names.isExtensible, is_extensible, 1, attr);
define_native_function(vm.names.preventExtensions, prevent_extensions, 1, attr);
define_native_function(vm.names.freeze, freeze, 1, attr);
define_native_function(vm.names.seal, seal, 1, attr);
define_native_function(vm.names.keys, keys, 1, attr);
define_native_function(vm.names.values, values, 1, attr);
define_native_function(vm.names.entries, entries, 1, attr);
@ -146,9 +149,43 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::prevent_extensions)
auto argument = vm.argument(0);
if (!argument.is_object())
return argument;
if (!argument.as_object().prevent_extensions()) {
if (!vm.exception())
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectPreventExtensionsReturnedFalse);
auto status = argument.as_object().prevent_extensions();
if (vm.exception())
return {};
if (!status) {
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectPreventExtensionsReturnedFalse);
return {};
}
return argument;
}
// 20.1.2.6 Object.freeze, https://tc39.es/ecma262/#sec-object.freeze
JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::freeze)
{
auto argument = vm.argument(0);
if (!argument.is_object())
return argument;
auto status = argument.as_object().set_integrity_level(Object::IntegrityLevel::Frozen);
if (vm.exception())
return {};
if (!status) {
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectFreezeFailed);
return {};
}
return argument;
}
// 20.1.2.20 Object.seal, https://tc39.es/ecma262/#sec-object.seal
JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::seal)
{
auto argument = vm.argument(0);
if (!argument.is_object())
return argument;
auto status = argument.as_object().set_integrity_level(Object::IntegrityLevel::Sealed);
if (vm.exception())
return {};
if (!status) {
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectSealFailed);
return {};
}
return argument;