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LibJS: Implement Temporal.ZonedDateTime.prototype.toPlainYearMonth()
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@ -6,6 +6,7 @@
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#include <AK/TypeCasts.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Temporal/AbstractOperations.h>
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#include <LibJS/Runtime/Temporal/Calendar.h>
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#include <LibJS/Runtime/Temporal/Instant.h>
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#include <LibJS/Runtime/Temporal/PlainDate.h>
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@ -65,6 +66,7 @@ void ZonedDateTimePrototype::initialize(GlobalObject& global_object)
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define_native_function(vm.names.toPlainDate, to_plain_date, 0, attr);
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define_native_function(vm.names.toPlainTime, to_plain_time, 0, attr);
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define_native_function(vm.names.toPlainDateTime, to_plain_date_time, 0, attr);
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define_native_function(vm.names.toPlainYearMonth, to_plain_year_month, 0, attr);
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define_native_function(vm.names.getISOFields, get_iso_fields, 0, attr);
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}
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@ -795,6 +797,43 @@ JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::to_plain_date_time)
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return builtin_time_zone_get_plain_date_time_for(global_object, &time_zone, *instant, zoned_date_time->calendar());
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}
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// 6.3.50 Temporal.ZonedDateTime.prototype.toPlainYearMonth ( ), https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.prototype.toplainyearmonth
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JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::to_plain_year_month)
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{
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// 1. Let zonedDateTime be the this value.
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// 2. Perform ? RequireInternalSlot(zonedDateTime, [[InitializedTemporalZonedDateTime]]).
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auto* zoned_date_time = typed_this(global_object);
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if (vm.exception())
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return {};
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// 3. Let timeZone be zonedDateTime.[[TimeZone]].
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auto& time_zone = zoned_date_time->time_zone();
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// 4. Let instant be ! CreateTemporalInstant(zonedDateTime.[[Nanoseconds]]).
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auto* instant = create_temporal_instant(global_object, zoned_date_time->nanoseconds());
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// 5. Let calendar be zonedDateTime.[[Calendar]].
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auto& calendar = zoned_date_time->calendar();
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// 6. Let temporalDateTime be ? BuiltinTimeZoneGetPlainDateTimeFor(timeZone, instant, calendar).
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auto* temporal_date_time = builtin_time_zone_get_plain_date_time_for(global_object, &time_zone, *instant, calendar);
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if (vm.exception())
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return {};
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// 7. Let fieldNames be ? CalendarFields(calendar, « "monthCode", "year" »).
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auto field_names = calendar_fields(global_object, calendar, { "monthCode"sv, "year"sv });
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if (vm.exception())
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return {};
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// 8. Let fields be ? PrepareTemporalFields(temporalDateTime, fieldNames, «»).
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auto* fields = prepare_temporal_fields(global_object, *temporal_date_time, field_names, {});
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if (vm.exception())
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return {};
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// 9. Return ? YearMonthFromFields(calendar, fields).
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return year_month_from_fields(global_object, calendar, *fields);
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}
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// 6.3.52 Temporal.ZonedDateTime.prototype.getISOFields ( ), https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.prototype.getisofields
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JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::get_iso_fields)
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{
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@ -50,6 +50,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(to_plain_date);
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JS_DECLARE_NATIVE_FUNCTION(to_plain_time);
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JS_DECLARE_NATIVE_FUNCTION(to_plain_date_time);
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JS_DECLARE_NATIVE_FUNCTION(to_plain_year_month);
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JS_DECLARE_NATIVE_FUNCTION(get_iso_fields);
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};
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@ -0,0 +1,14 @@
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describe("correct behavior", () => {
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test("length is 0", () => {
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expect(Temporal.ZonedDateTime.prototype.toPlainYearMonth).toHaveLength(0);
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});
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test("basic functionality", () => {
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const timeZone = new Temporal.TimeZone("UTC");
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const zonedDateTime = new Temporal.ZonedDateTime(1625614921000000000n, timeZone);
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const plainYearMonth = zonedDateTime.toPlainYearMonth();
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expect(plainYearMonth.calendar).toBe(zonedDateTime.calendar);
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expect(plainYearMonth.year).toBe(2021);
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expect(plainYearMonth.month).toBe(7);
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});
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});
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