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