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LibJS: Implement the SetFunctionLength AO

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Linus Groh 2022-01-24 19:10:46 +00:00
parent 5b04c49762
commit 886d6c62f9
2 changed files with 17 additions and 0 deletions
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16
Userland/Libraries/LibJS/Runtime/FunctionObject.cpp
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@ -76,6 +76,22 @@ void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const&
MUST(define_property_or_throw(vm.names.name, PropertyDescriptor { .value = js_string(vm, move(name)), .writable = false, .enumerable = false, .configurable = true }));
}
// 10.2.10 SetFunctionLength ( F, length ), https://tc39.es/ecma262/#sec-setfunctionlength
void FunctionObject::set_function_length(double length)
{
auto& vm = this->vm();
// "length (a non-negative integer or +∞)"
VERIFY(trunc(length) == length || __builtin_isinf_sign(length) == 1);
// 1. Assert: F is an extensible object that does not have a "length" own property.
VERIFY(m_is_extensible);
VERIFY(!storage_has(vm.names.length));
// 2. Return ! DefinePropertyOrThrow(F, "length", PropertyDescriptor { [[Value]]: 𝔽(length), [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
MUST(define_property_or_throw(vm.names.length, PropertyDescriptor { .value = Value { length }, .writable = false, .enumerable = false, .configurable = true }));
}
ThrowCompletionOr<BoundFunction*> FunctionObject::bind(Value bound_this_value, Vector<Value> arguments)
{
auto& vm = this->vm();