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LibJS: Replace Set's GetKeysIterator AO with GetIteratorFromMethod

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This is a normative change in the Set Methods proposal. See:
f3d5206

Note that this is normative due to an IsCallable check being deferred to
some time after its previous invocation in the GetKeysIterator.
This commit is contained in:
Timothy Flynn 2023-07-18 15:13:30 -04:00 • committed by Andreas Kling
parent cd27c0d67e
commit 4b0ef6b81d
1 changed files with 12 additions and 33 deletions
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45
Userland/Libraries/LibJS/Runtime/SetPrototype.cpp
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@ -251,27 +251,6 @@ static ThrowCompletionOr<SetRecord> get_set_record(VM& vm, Value value)
return SetRecord { .set = object, .size = integer_size, .has = has.as_function(), .keys = keys.as_function() };
}
// 10 GetKeysIterator ( setRec ), https://tc39.es/proposal-set-methods/#sec-getkeysiterator
static ThrowCompletionOr<IteratorRecord> get_keys_iterator(VM& vm, SetRecord const& set_record)
{
// 1. Let keysIter be ? Call(setRec.[[Keys]], setRec.[[Set]]).
auto keys_iterator = TRY(call(vm, *set_record.keys, set_record.set));
// 2. If keysIter is not an Object, throw a TypeError exception.
if (!keys_iterator.is_object())
return vm.throw_completion<TypeError>(ErrorType::NotAnObject, TRY_OR_THROW_OOM(vm, keys_iterator.to_string_without_side_effects()));
// 3. Let nextMethod be ? Get(keysIter, "next").
auto next_method = TRY(keys_iterator.as_object().get(vm.names.next));
// 4. If IsCallable(nextMethod) is false, throw a TypeError exception.
if (!next_method.is_function())
return vm.throw_completion<TypeError>(ErrorType::NotAFunction, TRY_OR_THROW_OOM(vm, next_method.to_string_without_side_effects()));
// 5. Return a new Iterator Record { [[Iterator]]: keysIter, [[NextMethod]]: nextMethod, [[Done]]: false }.
return IteratorRecord { .iterator = &keys_iterator.as_object(), .next_method = next_method, .done = false };
}
// 1 Set.prototype.union ( other ), https://tc39.es/proposal-set-methods/#sec-set.prototype.union
JS_DEFINE_NATIVE_FUNCTION(SetPrototype::union_)
{
@ -282,8 +261,8 @@ JS_DEFINE_NATIVE_FUNCTION(SetPrototype::union_)
// 3. Let otherRec be ? GetSetRecord(other).
auto other_record = TRY(get_set_record(vm, vm.argument(0)));
// 4. Let keysIter be ? GetKeysIterator(otherRec).
auto keys_iterator = TRY(get_keys_iterator(vm, other_record));
// 4. Let keysIter be ? GetIteratorFromMethod(otherRec.[[Set]], otherRec.[[Keys]]).
auto keys_iterator = TRY(get_iterator_from_method(vm, other_record.set, other_record.keys));
// 5. Let resultSetData be a copy of O.[[SetData]].
auto result = set->copy();
@ -353,8 +332,8 @@ JS_DEFINE_NATIVE_FUNCTION(SetPrototype::intersection)
}
// 7. Else,
else {
// a. Let keysIter be ? GetKeysIterator(otherRec).
auto keys_iterator = TRY(get_keys_iterator(vm, other_record));
// a. Let keysIter be ? GetIteratorFromMethod(otherRec.[[Set]], otherRec.[[Keys]]).
auto keys_iterator = TRY(get_iterator_from_method(vm, other_record.set, other_record.keys));
// b. Let next be true.
auto next = true;
@ -431,8 +410,8 @@ JS_DEFINE_NATIVE_FUNCTION(SetPrototype::difference)
}
// 7. Else,
else {
// a. Let keysIter be ? GetKeysIterator(otherRec).
auto keys_iterator = TRY(get_keys_iterator(vm, other_record));
// a. Let keysIter be ? GetIteratorFromMethod(otherRec.[[Set]], otherRec.[[Keys]]).
auto keys_iterator = TRY(get_iterator_from_method(vm, other_record.set, other_record.keys));
// b. Let next be true.
auto next = true;
@ -478,8 +457,8 @@ JS_DEFINE_NATIVE_FUNCTION(SetPrototype::symmetric_difference)
// 3. Let otherRec be ? GetSetRecord(other).
auto other_record = TRY(get_set_record(vm, vm.argument(0)));
// 4. Let keysIter be ? GetKeysIterator(otherRec).
auto keys_iterator = TRY(get_keys_iterator(vm, other_record));
// 4. Let keysIter be ? GetIteratorFromMethod(otherRec.[[Set]], otherRec.[[Keys]]).
auto keys_iterator = TRY(get_iterator_from_method(vm, other_record.set, other_record.keys));
// 5. Let resultSetData be a copy of O.[[SetData]].
auto result = set->copy();
@ -571,8 +550,8 @@ JS_DEFINE_NATIVE_FUNCTION(SetPrototype::is_superset_of)
if (this_size < other_record.size)
return false;
// 6. Let keysIter be ? GetKeysIterator(otherRec).
auto keys_iterator = TRY(get_keys_iterator(vm, other_record));
// 6. Let keysIter be ? GetIteratorFromMethod(otherRec.[[Set]], otherRec.[[Keys]]).
auto keys_iterator = TRY(get_iterator_from_method(vm, other_record.set, other_record.keys));
// 7. Let next be true.
auto next = true;
@ -625,8 +604,8 @@ JS_DEFINE_NATIVE_FUNCTION(SetPrototype::is_disjoint_from)
}
// 6. Else,
else {
// a. Let keysIter be ? GetKeysIterator(otherRec).
auto keys_iterator = TRY(get_keys_iterator(vm, other_record));
// a. Let keysIter be ? GetIteratorFromMethod(otherRec.[[Set]], otherRec.[[Keys]]).
auto keys_iterator = TRY(get_iterator_from_method(vm, other_record.set, other_record.keys));
// b. Let next be true.
auto next = true;