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LibJS: Implement Object.freeze() and Object.seal()

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This commit is contained in:
Linus Groh 2021-04-06 22:06:11 +02:00 • committed by Andreas Kling
parent 1c3eef5317
commit 9af07c7803
8 changed files with 202 additions and 3 deletions
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48
Userland/Libraries/LibJS/Runtime/Object.cpp
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@ -160,6 +160,54 @@ bool Object::prevent_extensions()
return true;
}
// 7.3.15 SetIntegrityLevel, https://tc39.es/ecma262/#sec-setintegritylevel
bool Object::set_integrity_level(IntegrityLevel level)
{
// FIXME: This feels clunky and should get nicer abstractions.
auto update_property = [this](auto& key, auto attributes) {
auto property_name = PropertyName::from_value(global_object(), key);
auto metadata = shape().lookup(property_name.to_string_or_symbol());
VERIFY(metadata.has_value());
auto value = get_direct(metadata->offset);
define_property(property_name, value, metadata->attributes.bits() & attributes);
};
auto& vm = this->vm();
auto status = prevent_extensions();
if (vm.exception())
return false;
if (!status)
return false;
auto keys = get_own_properties(PropertyKind::Key);
if (vm.exception())
return false;
switch (level) {
case IntegrityLevel::Sealed:
for (auto& key : keys) {
update_property(key, ~Attribute::Configurable);
if (vm.exception())
return {};
}
break;
case IntegrityLevel::Frozen:
for (auto& key : keys) {
auto property_name = PropertyName::from_value(global_object(), key);
auto property_descriptor = get_own_property_descriptor(property_name);
VERIFY(property_descriptor.has_value());
u8 attributes = property_descriptor->is_accessor_descriptor()
? ~Attribute::Configurable
: ~Attribute::Configurable & ~Attribute::Writable;
update_property(key, attributes);
if (vm.exception())
return {};
}
break;
default:
VERIFY_NOT_REACHED();
}
return true;
}
Value Object::get_own_property(const PropertyName& property_name, Value receiver) const
{
VERIFY(property_name.is_valid());