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LibJS: Only allow TimeZone this value in TimeZone#getPlainDateTimeFor

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This is a normative change in the Temporal spec.

See: 2644fc6
This commit is contained in:
Luke Wilde 2021-12-18 23:17:09 +00:00 • committed by Linus Groh
parent 7729598b5b
commit cf5f08b317
2 changed files with 15 additions and 28 deletions
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9
Userland/Libraries/LibJS/Runtime/Temporal/TimeZonePrototype.cpp
View file

@ -92,15 +92,16 @@ JS_DEFINE_NATIVE_FUNCTION(TimeZonePrototype::get_offset_string_for)
JS_DEFINE_NATIVE_FUNCTION(TimeZonePrototype::get_plain_date_time_for)
{
// 1. Let timeZone be the this value.
auto time_zone = vm.this_value(global_object);
// 2. Perform ? RequireInternalSlot(timeZone, [[InitializedTemporalTimeZone]]).
auto* time_zone = TRY(typed_this_object(global_object));
// 2. Set instant to ? ToTemporalInstant(instant).
// 3. Set instant to ? ToTemporalInstant(instant).
auto* instant = TRY(to_temporal_instant(global_object, vm.argument(0)));
// 3. Let calendar be ? ToTemporalCalendarWithISODefault(calendarLike).
// 4. Let calendar be ? ToTemporalCalendarWithISODefault(calendarLike).
auto* calendar = TRY(to_temporal_calendar_with_iso_default(global_object, vm.argument(1)));
// 4. Return ? BuiltinTimeZoneGetPlainDateTimeFor(timeZone, instant, calendar).
// 5. Return ? BuiltinTimeZoneGetPlainDateTimeFor(timeZone, instant, calendar).
return TRY(builtin_time_zone_get_plain_date_time_for(global_object, time_zone, *instant, *calendar));
}

34
Userland/Libraries/LibJS/Tests/builtins/Temporal/TimeZone/TimeZone.prototype.getPlainDateTimeFor.js
View file

@ -26,35 +26,21 @@ describe("correct behavior", () => {
const plainDateTime = timeZone.getPlainDateTimeFor(instant, calendar);
expect(plainDateTime.calendar).toBe(calendar);
});
test("non-TimeZone this value", () => {
const timeZoneLike = {
getOffsetNanosecondsFor() {
return 123;
},
};
const instant = new Temporal.Instant(0n);
const plainDateTime = Temporal.TimeZone.prototype.getPlainDateTimeFor.call(
timeZoneLike,
instant
);
expect(plainDateTime.year).toBe(1970);
expect(plainDateTime.month).toBe(1);
expect(plainDateTime.day).toBe(1);
expect(plainDateTime.hour).toBe(0);
expect(plainDateTime.minute).toBe(0);
expect(plainDateTime.second).toBe(0);
expect(plainDateTime.millisecond).toBe(0);
expect(plainDateTime.microsecond).toBe(0);
expect(plainDateTime.nanosecond).toBe(123);
});
});
describe("errors", () => {
test("custom time zone doesn't have a getOffsetNanosecondsFor function", () => {
test("time zone doesn't have a getOffsetNanosecondsFor function", () => {
const timeZone = new Temporal.TimeZone("UTC");
timeZone.getOffsetNanosecondsFor = undefined;
const instant = new Temporal.Instant(1n);
expect(() => {
Temporal.TimeZone.prototype.getPlainDateTimeFor.call({}, instant);
timeZone.getPlainDateTimeFor(instant);
}).toThrowWithMessage(TypeError, "null is not a function");
});
test("this value must be a Temporal.TimeZone object", () => {
expect(() => {
Temporal.TimeZone.prototype.getPlainDateTimeFor.call("foo");
}).toThrowWithMessage(TypeError, "Not an object of type Temporal.TimeZone");
});
});