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LibJS: Remove extra property check from Instant#toZonedDateTimeISO

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This is a normative change in the Temporal spec.

See: 7dfbd80
This commit is contained in:
Luke Wilde 2022-10-16 00:29:35 +01:00 • committed by Linus Groh
parent f7bb79d6d1
commit 707f12f927
2 changed files with 24 additions and 19 deletions
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24
Userland/Libraries/LibJS/Runtime/Temporal/InstantPrototype.cpp
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@ -388,34 +388,20 @@ JS_DEFINE_NATIVE_FUNCTION(InstantPrototype::to_zoned_date_time)
return TRY(create_temporal_zoned_date_time(vm, instant->nanoseconds(), *time_zone, *calendar));
}
// 8.3.18 Temporal.Instant.prototype.toZonedDateTimeISO ( item ), https://tc39.es/proposal-temporal/#sec-temporal.instant.prototype.tozoneddatetimeiso
// 8.3.18 Temporal.Instant.prototype.toZonedDateTimeISO ( timeZone ), https://tc39.es/proposal-temporal/#sec-temporal.instant.prototype.tozoneddatetimeiso
JS_DEFINE_NATIVE_FUNCTION(InstantPrototype::to_zoned_date_time_iso)
{
auto item = vm.argument(0);
// 1. Let instant be the this value.
// 2. Perform ? RequireInternalSlot(instant, [[InitializedTemporalInstant]]).
auto* instant = TRY(typed_this_object(vm));
// 3. If Type(item) is Object, then
if (item.is_object()) {
// a. Let timeZoneProperty be ? Get(item, "timeZone").
auto time_zone_property = TRY(item.as_object().get(vm.names.timeZone));
// 3. Set timeZone to ? ToTemporalTimeZone(timeZone).
auto* time_zone = TRY(to_temporal_time_zone(vm, vm.argument(0)));
// b. If timeZoneProperty is not undefined, then
if (!time_zone_property.is_undefined()) {
// i. Set item to timeZoneProperty.
item = time_zone_property;
}
}
// 4. Let timeZone be ? ToTemporalTimeZone(item).
auto* time_zone = TRY(to_temporal_time_zone(vm, item));
// 5. Let calendar be ! GetISO8601Calendar().
// 4. Let calendar be ! GetISO8601Calendar().
auto* calendar = get_iso8601_calendar(vm);
// 6. Return ? CreateTemporalZonedDateTime(instant.[[Nanoseconds]], timeZone, calendar).
// 5. Return ? CreateTemporalZonedDateTime(instant.[[Nanoseconds]], timeZone, calendar).
return TRY(create_temporal_zoned_date_time(vm, instant->nanoseconds(), *time_zone, *calendar));
}

19
Userland/Libraries/LibJS/Tests/builtins/Temporal/Instant/Instant.prototype.toZonedDateTimeISO.js
View file

@ -25,6 +25,25 @@ describe("correct behavior", () => {
const zonedDateTime = instant.toZonedDateTimeISO({ timeZone });
expect(zonedDateTime.timeZone).toBe(timeZone);
});
test("avoids extra timeZone property lookup", () => {
const instant = new Temporal.Instant(1625614921123456789n);
let timesGetterCalled = 0;
const timeZoneObject = {
get timeZone() {
timesGetterCalled++;
return "UTC";
},
toString() {
return "UTC";
},
};
instant.toZonedDateTimeISO({ timeZone: timeZoneObject });
expect(timesGetterCalled).toBe(0);
});
});
describe("errors", () => {