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LibJS: Avoid creating String object wrappers in iterator helpers

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This is a normative change in the Iterator Helpers spec. See:
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Timothy Flynn 2023-07-12 15:45:05 -04:00 • committed by Linus Groh
parent acd8c94e88
commit ff4e0d2943
5 changed files with 39 additions and 18 deletions
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18
Userland/Libraries/LibJS/Runtime/IteratorConstructor.cpp
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@ -66,27 +66,23 @@ JS_DEFINE_NATIVE_FUNCTION(IteratorConstructor::from)
auto object = vm.argument(0);
// 1. If O is a String, set O to ! ToObject(O).
if (object.is_string())
object = MUST_OR_THROW_OOM(object.to_object(vm));
// 1. Let iteratorRecord be ? GetIteratorFlattenable(O, iterate-strings).
auto iterator_record = TRY(get_iterator_flattenable(vm, object, StringHandling::IterateStrings));
// 2. Let iteratorRecord be ? GetIteratorFlattenable(O).
auto iterator_record = TRY(get_iterator_flattenable(vm, object));
// 3. Let hasInstance be ? OrdinaryHasInstance(%Iterator%, iteratorRecord.[[Iterator]]).
// 2. Let hasInstance be ? OrdinaryHasInstance(%Iterator%, iteratorRecord.[[Iterator]]).
auto has_instance = TRY(ordinary_has_instance(vm, iterator_record.iterator, realm.intrinsics().iterator_constructor()));
// 4. If hasInstance is true, then
// 3. If hasInstance is true, then
if (has_instance.is_boolean() && has_instance.as_bool()) {
// a. Return iteratorRecord.[[Iterator]].
return iterator_record.iterator;
}
// 5. Let wrapper be OrdinaryObjectCreate(%WrapForValidIteratorPrototype%, « [[Iterated]] »).
// 6. Set wrapper.[[Iterated]] to iteratorRecord.
// 4. Let wrapper be OrdinaryObjectCreate(%WrapForValidIteratorPrototype%, « [[Iterated]] »).
// 5. Set wrapper.[[Iterated]] to iteratorRecord.
auto wrapper = MUST_OR_THROW_OOM(Iterator::create(realm, realm.intrinsics().wrap_for_valid_iterator_prototype(), move(iterator_record)));
// 7. Return wrapper.
// 6. Return wrapper.
return wrapper;
}