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LibJS: Update ValidateAndApplyPropertyDescriptor implementation

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These are editorial changes in the ECMA-262 spec.

See:
- b9efa97
- 6f4ff96
- 3d18997
- b3c29fd
This commit is contained in:
Linus Groh 2022-05-01 00:22:51 +02:00
parent 85c16452f9
commit d33fcad87f
2 changed files with 93 additions and 111 deletions
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14
Userland/Libraries/LibJS/Runtime/Array.cpp
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@ -96,25 +96,23 @@ ThrowCompletionOr<bool> Array::set_length(PropertyDescriptor const& property_des
// checks performed inside of it that would have mattered to us:
// 10.1.6.3 ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current ), https://tc39.es/ecma262/#sec-validateandapplypropertydescriptor
// 4. If current.[[Configurable]] is false, then
// 5. If current.[[Configurable]] is false, then
// a. If Desc.[[Configurable]] is present and its value is true, return false.
if (property_descriptor.configurable.has_value() && *property_descriptor.configurable)
return false;
// b. If Desc.[[Enumerable]] is present and ! SameValue(Desc.[[Enumerable]], current.[[Enumerable]]) is false, return false.
if (property_descriptor.enumerable.has_value() && *property_descriptor.enumerable)
return false;
// 6. Else if ! SameValue(! IsDataDescriptor(current), ! IsDataDescriptor(Desc)) is false, then
if (property_descriptor.is_accessor_descriptor()) {
// a. If current.[[Configurable]] is false, return false.
// c. If ! IsGenericDescriptor(Desc) is false and ! SameValue(IsAccessorDescriptor(Desc), IsAccessorDescriptor(current)) is false, return false.
if (!property_descriptor.is_generic_descriptor() && property_descriptor.is_accessor_descriptor())
return false;
}
// 7. Else if IsDataDescriptor(current) and IsDataDescriptor(Desc) are both true, then
// a. If current.[[Configurable]] is false and current.[[Writable]] is false, then
// NOTE: Step d. doesn't apply here.
// e. Else if current.[[Writable]] is false, then
if (!m_length_writable) {
// i. If Desc.[[Writable]] is present and Desc.[[Writable]] is true, return false.
if (property_descriptor.writable.has_value() && *property_descriptor.writable)
return false;
// ii. If Desc.[[Value]] is present and SameValue(Desc.[[Value]], current.[[Value]]) is false, return false.
// ii. If Desc.[[Value]] is present and ! SameValue(Desc.[[Value]], current.[[Value]]) is false, return false.
if (new_length != indexed_properties().array_like_size())
return false;
}