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LibJS: Convert get_iterator_values helper to ThrowCompletionOr

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This one is a bit unusual, so to clarify:

Previously, callers of get_iterator_values() would supply a callback
that would return an IterationDecision, and an enum to indicate whether
iterator_close() should be invoked upon IterationDecision::Break.

Now, use of both those enums is removed, and callers must return an
Optional<Completion>. If a Completion is provided, the iterator will be
closed, and that completion will be returned from get_iterator_values.
Otherwise, once the iterator is exhausted, a default-initialized
Completion will be returned.
This commit is contained in:
Timothy Flynn 2021-10-20 12:10:23 -04:00 • committed by Linus Groh
parent 7b4814f74c
commit 04b4307b3d
8 changed files with 74 additions and 135 deletions
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48
Userland/Libraries/LibJS/Runtime/IteratorOperations.cpp
View file

@ -143,50 +143,32 @@ MarkedValueList iterable_to_list(GlobalObject& global_object, Value iterable, Va
{
auto& vm = global_object.vm();
MarkedValueList values(vm.heap());
get_iterator_values(
global_object, iterable, [&](auto value) {
if (vm.exception())
return IterationDecision::Break;
(void)get_iterator_values(
global_object, iterable, [&](auto value) -> Optional<Completion> {
values.append(value);
return IterationDecision::Continue;
return {};
},
method, CloseOnAbrupt::No);
method);
return values;
}
void get_iterator_values(GlobalObject& global_object, Value value, Function<IterationDecision(Value)> callback, Value method, CloseOnAbrupt close_on_abrupt)
Completion get_iterator_values(GlobalObject& global_object, Value iterable, IteratorValueCallback callback, Value method)
{
auto& vm = global_object.vm();
auto iterator_or_error = get_iterator(global_object, value, IteratorHint::Sync, method);
if (iterator_or_error.is_error())
return;
auto* iterator = iterator_or_error.release_value();
auto* iterator = TRY(get_iterator(global_object, iterable, IteratorHint::Sync, method));
while (true) {
auto next_object_or_error = iterator_next(*iterator);
if (next_object_or_error.is_error())
return;
auto* next_object = next_object_or_error.release_value();
auto* next_object = TRY(iterator_step(global_object, *iterator));
if (!next_object)
return {};
auto done_property_or_error = next_object->get(vm.names.done);
if (done_property_or_error.is_error())
return;
auto next_value = TRY(iterator_value(global_object, *next_object));
if (done_property_or_error.release_value().to_boolean())
return;
auto next_value_or_error = next_object->get(vm.names.value);
if (next_value_or_error.is_error())
return;
auto result = callback(next_value_or_error.release_value());
if (result == IterationDecision::Break) {
if (close_on_abrupt == CloseOnAbrupt::Yes)
iterator_close(*iterator);
return;
if (auto completion = callback(next_value); completion.has_value()) {
iterator_close(*iterator);
return completion.release_value();
}
VERIFY(result == IterationDecision::Continue);
}
}