using Jint.Native.Function; using Jint.Native.Object; using Jint.Runtime; using Jint.Runtime.Descriptors; namespace Jint.Native.WeakRef; /// /// https://tc39.es/ecma262/#sec-weak-ref-constructor /// internal sealed class WeakRefConstructor : Constructor { private static readonly JsString _functionName = new("WeakRef"); internal WeakRefConstructor( Engine engine, Realm realm, FunctionPrototype functionPrototype, ObjectPrototype objectPrototype) : base(engine, realm, _functionName) { _prototype = functionPrototype; PrototypeObject = new WeakRefPrototype(engine, realm, this, objectPrototype); _length = new PropertyDescriptor(1, PropertyFlag.Configurable); _prototypeDescriptor = new PropertyDescriptor(PrototypeObject, PropertyFlag.AllForbidden); } private WeakRefPrototype PrototypeObject { get; } public override ObjectInstance Construct(JsCallArguments arguments, JsValue newTarget) { if (newTarget.IsUndefined()) { Throw.TypeError(_realm); } var target = arguments.At(0); if (!target.CanBeHeldWeakly(_engine.GlobalSymbolRegistry)) { Throw.TypeError(_realm, "WeakRef: target must be an object or symbol"); } var weakRef = OrdinaryCreateFromConstructor( newTarget, static intrinsics => intrinsics.WeakRef.PrototypeObject, static (engine, _, target) => new JsWeakRef(engine, target!), target); _engine.AddToKeptObjects(target); return weakRef; } }