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LibJS: Implement Temporal.ZonedDateTime.prototype.toPlainYearMonth()

This commit is contained in:
Linus Groh 2021-08-23 23:35:59 +01:00 committed by Andreas Kling
parent fc58f93734
commit ef581be4ec
3 changed files with 54 additions and 0 deletions

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@ -6,6 +6,7 @@
#include <AK/TypeCasts.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Temporal/AbstractOperations.h>
#include <LibJS/Runtime/Temporal/Calendar.h>
#include <LibJS/Runtime/Temporal/Instant.h>
#include <LibJS/Runtime/Temporal/PlainDate.h>
@ -65,6 +66,7 @@ void ZonedDateTimePrototype::initialize(GlobalObject& global_object)
define_native_function(vm.names.toPlainDate, to_plain_date, 0, attr);
define_native_function(vm.names.toPlainTime, to_plain_time, 0, attr);
define_native_function(vm.names.toPlainDateTime, to_plain_date_time, 0, attr);
define_native_function(vm.names.toPlainYearMonth, to_plain_year_month, 0, attr);
define_native_function(vm.names.getISOFields, get_iso_fields, 0, attr);
}
@ -795,6 +797,43 @@ JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::to_plain_date_time)
return builtin_time_zone_get_plain_date_time_for(global_object, &time_zone, *instant, zoned_date_time->calendar());
}
// 6.3.50 Temporal.ZonedDateTime.prototype.toPlainYearMonth ( ), https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.prototype.toplainyearmonth
JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::to_plain_year_month)
{
// 1. Let zonedDateTime be the this value.
// 2. Perform ? RequireInternalSlot(zonedDateTime, [[InitializedTemporalZonedDateTime]]).
auto* zoned_date_time = typed_this(global_object);
if (vm.exception())
return {};
// 3. Let timeZone be zonedDateTime.[[TimeZone]].
auto& time_zone = zoned_date_time->time_zone();
// 4. Let instant be ! CreateTemporalInstant(zonedDateTime.[[Nanoseconds]]).
auto* instant = create_temporal_instant(global_object, zoned_date_time->nanoseconds());
// 5. Let calendar be zonedDateTime.[[Calendar]].
auto& calendar = zoned_date_time->calendar();
// 6. Let temporalDateTime be ? BuiltinTimeZoneGetPlainDateTimeFor(timeZone, instant, calendar).
auto* temporal_date_time = builtin_time_zone_get_plain_date_time_for(global_object, &time_zone, *instant, calendar);
if (vm.exception())
return {};
// 7. Let fieldNames be ? CalendarFields(calendar, « "monthCode", "year" »).
auto field_names = calendar_fields(global_object, calendar, { "monthCode"sv, "year"sv });
if (vm.exception())
return {};
// 8. Let fields be ? PrepareTemporalFields(temporalDateTime, fieldNames, «»).
auto* fields = prepare_temporal_fields(global_object, *temporal_date_time, field_names, {});
if (vm.exception())
return {};
// 9. Return ? YearMonthFromFields(calendar, fields).
return year_month_from_fields(global_object, calendar, *fields);
}
// 6.3.52 Temporal.ZonedDateTime.prototype.getISOFields ( ), https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.prototype.getisofields
JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::get_iso_fields)
{

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@ -50,6 +50,7 @@ private:
JS_DECLARE_NATIVE_FUNCTION(to_plain_date);
JS_DECLARE_NATIVE_FUNCTION(to_plain_time);
JS_DECLARE_NATIVE_FUNCTION(to_plain_date_time);
JS_DECLARE_NATIVE_FUNCTION(to_plain_year_month);
JS_DECLARE_NATIVE_FUNCTION(get_iso_fields);
};

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@ -0,0 +1,14 @@
describe("correct behavior", () => {
test("length is 0", () => {
expect(Temporal.ZonedDateTime.prototype.toPlainYearMonth).toHaveLength(0);
});
test("basic functionality", () => {
const timeZone = new Temporal.TimeZone("UTC");
const zonedDateTime = new Temporal.ZonedDateTime(1625614921000000000n, timeZone);
const plainYearMonth = zonedDateTime.toPlainYearMonth();
expect(plainYearMonth.calendar).toBe(zonedDateTime.calendar);
expect(plainYearMonth.year).toBe(2021);
expect(plainYearMonth.month).toBe(7);
});
});