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LibJS: Add spec comments to the Error constructor
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1 changed files with 18 additions and 7 deletions
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2020-2022, 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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@ -27,27 +27,38 @@ void ErrorConstructor::initialize(GlobalObject& global_object)
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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}
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// 20.5.1.1 Error ( message ), https://tc39.es/ecma262/#sec-error-message
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// 20.5.1.1 Error ( message [ , options ] ), https://tc39.es/ecma262/#sec-error-message
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ThrowCompletionOr<Value> ErrorConstructor::call()
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{
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// 1. If NewTarget is undefined, let newTarget be the active function object; else let newTarget be NewTarget.
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return TRY(construct(*this));
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}
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// 20.5.1.1 Error ( message ), https://tc39.es/ecma262/#sec-error-message
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// 20.5.1.1 Error ( message [ , options ] ), https://tc39.es/ecma262/#sec-error-message
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ThrowCompletionOr<Object*> ErrorConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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auto message = vm.argument(0);
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auto options = vm.argument(1);
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// 2. Let O be ? OrdinaryCreateFromConstructor(newTarget, "%Error.prototype%", « [[ErrorData]] »).
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auto* error = TRY(ordinary_create_from_constructor<Error>(global_object, new_target, &GlobalObject::error_prototype));
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if (!vm.argument(0).is_undefined()) {
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auto message = TRY(vm.argument(0).to_string(global_object));
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MUST(error->create_non_enumerable_data_property_or_throw(vm.names.message, js_string(vm, message)));
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// 3. If message is not undefined, then
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if (!message.is_undefined()) {
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// a. Let msg be ? ToString(message).
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auto msg = TRY(message.to_string(global_object));
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// b. Perform ! CreateNonEnumerableDataPropertyOrThrow(O, "message", msg).
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MUST(error->create_non_enumerable_data_property_or_throw(vm.names.message, js_string(vm, move(msg))));
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}
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TRY(error->install_error_cause(vm.argument(1)));
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// 4. Perform ? InstallErrorCause(O, options).
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TRY(error->install_error_cause(options));
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// 5. Return O.
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return error;
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}
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