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LibJS: Implement Temporal.Calendar.prototype.monthCode
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@ -489,4 +489,19 @@ u8 iso_month(Object& temporal_object)
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VERIFY_NOT_REACHED();
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}
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// 12.1.43 ISOMonthCode ( temporalObject ), https://tc39.es/proposal-temporal/#sec-temporal-isomonthcode
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String iso_month_code(Object& temporal_object)
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{
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// 1. Assert: temporalObject has an [[ISOMonth]] internal slot.
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// NOTE: Asserted by the VERIFY_NOT_REACHED at the end
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// 2. Return ! BuildISOMonthCode(temporalObject.[[ISOMonth]]).
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// TODO: add the rest of the builtins with a [[ISOMonth]] slot (PlainYearMonth, PlainMonthDay)
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if (is<PlainDate>(temporal_object))
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return build_iso_month_code(static_cast<PlainDate&>(temporal_object).iso_month());
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if (is<PlainDateTime>(temporal_object))
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return build_iso_month_code(static_cast<PlainDateTime&>(temporal_object).iso_month());
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VERIFY_NOT_REACHED();
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}
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}
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@ -48,5 +48,6 @@ double resolve_iso_month(GlobalObject&, Object& fields);
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Optional<TemporalDate> iso_date_from_fields(GlobalObject&, Object& fields, Object& options);
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i32 iso_year(Object& temporal_object);
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u8 iso_month(Object& temporal_object);
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String iso_month_code(Object& temporal_object);
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}
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@ -33,6 +33,7 @@ void CalendarPrototype::initialize(GlobalObject& global_object)
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define_native_function(vm.names.dateFromFields, date_from_fields, 2, attr);
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define_native_function(vm.names.year, year, 1, attr);
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define_native_function(vm.names.month, month, 1, attr);
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define_native_function(vm.names.monthCode, month_code, 1, attr);
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define_native_function(vm.names.toString, to_string, 0, attr);
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define_native_function(vm.names.toJSON, to_json, 0, attr);
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}
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@ -152,6 +153,33 @@ JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::month)
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return Value(iso_month(temporal_date_like.as_object()));
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}
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// 12.4.11 Temporal.Calendar.prototype.monthCode ( temporalDateLike ), https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.monthcode
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// NOTE: This is the minimum monthCode implementation for engines without ECMA-402.
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JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::month_code)
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{
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// 1. Let calendar be the this value.
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// 2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
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auto* calendar = typed_this(global_object);
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if (vm.exception())
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return {};
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// 3. Assert: calendar.[[Identifier]] is "iso8601".
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VERIFY(calendar->identifier() == "iso8601"sv);
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auto temporal_date_like = vm.argument(0);
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// 4. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]], [[InitializedTemporalMonthDay]], or [[InitializedTemporalYearMonth]] internal slot, then
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// TODO PlainMonthDay & PlainYearMonth objects
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if (!temporal_date_like.is_object() || !is<PlainDate>(temporal_date_like.as_object())) {
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// a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
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temporal_date_like = to_temporal_date(global_object, temporal_date_like);
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if (vm.exception())
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return {};
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}
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// 5. Return ! ISOMonthCode(temporalDateLike).
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return js_string(vm, iso_month_code(temporal_date_like.as_object()));
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}
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// 12.4.23 Temporal.Calendar.prototype.toString ( ), https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.tostring
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JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::to_string)
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{
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@ -23,6 +23,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(date_from_fields);
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JS_DECLARE_NATIVE_FUNCTION(year);
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JS_DECLARE_NATIVE_FUNCTION(month);
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JS_DECLARE_NATIVE_FUNCTION(month_code);
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JS_DECLARE_NATIVE_FUNCTION(to_string);
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JS_DECLARE_NATIVE_FUNCTION(to_json);
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};
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@ -0,0 +1,11 @@
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describe("correct behavior", () => {
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test("length is 1", () => {
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expect(Temporal.Calendar.prototype.monthCode).toHaveLength(1);
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});
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test("basic functionality", () => {
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const calendar = new Temporal.Calendar("iso8601");
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const date = new Temporal.PlainDate(2021, 7, 23);
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expect(calendar.monthCode(date)).toBe("M07");
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});
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});
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