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LibJS: Add an Iterator constructor and object

The Iterator object cannot be constructed directly but can be subclassed
or created with `Iterator.from` (not implemented here).
This commit is contained in:
Timothy Flynn 2023-06-24 10:01:04 -04:00 committed by Andreas Kling
parent 428109e709
commit 5736b53013
9 changed files with 165 additions and 1 deletions

View file

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/*
* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Intrinsics.h>
#include <LibJS/Runtime/Iterator.h>
#include <LibJS/Runtime/IteratorConstructor.h>
#include <LibJS/Runtime/IteratorPrototype.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/VM.h>
namespace JS {
// 3.1.1.1 The Iterator Constructor, https://tc39.es/proposal-iterator-helpers/#sec-iterator-constructor
IteratorConstructor::IteratorConstructor(Realm& realm)
: Base(realm.vm().names.Iterator.as_string(), realm.intrinsics().function_prototype())
{
}
ThrowCompletionOr<void> IteratorConstructor::initialize(Realm& realm)
{
MUST_OR_THROW_OOM(Base::initialize(realm));
auto& vm = this->vm();
// 3.1.1.2.1 Iterator.prototype, https://tc39.es/proposal-iterator-helpers/#sec-iterator.prototype
define_direct_property(vm.names.prototype, realm.intrinsics().iterator_prototype(), 0);
define_direct_property(vm.names.length, Value(0), Attribute::Configurable);
return {};
}
// 3.1.1.1.1 Iterator ( ), https://tc39.es/proposal-iterator-helpers/#sec-iterator
ThrowCompletionOr<Value> IteratorConstructor::call()
{
auto& vm = this->vm();
// 1. If NewTarget is undefined or the active function object, throw a TypeError exception.
return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, "Iterator");
}
// 3.1.1.1.1 Iterator ( ), https://tc39.es/proposal-iterator-helpers/#sec-iterator
ThrowCompletionOr<NonnullGCPtr<Object>> IteratorConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
// 1. If NewTarget is undefined or the active function object, throw a TypeError exception.
if (&new_target == this)
return vm.throw_completion<TypeError>(ErrorType::ClassIsAbstract, "Iterator");
// 2. Return ? OrdinaryCreateFromConstructor(NewTarget, "%Iterator.prototype%").
return TRY(ordinary_create_from_constructor<Iterator>(vm, new_target, &Intrinsics::iterator_prototype));
}
}