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LibJS: Implement Temporal.Calendar.prototype.monthsInYear
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4 changed files with 41 additions and 0 deletions
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@ -265,6 +265,7 @@ namespace JS {
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P(month) \
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P(monthCode) \
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P(months) \
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P(monthsInYear) \
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P(multiline) \
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P(name) \
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P(nanoseconds) \
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@ -41,6 +41,7 @@ void CalendarPrototype::initialize(GlobalObject& global_object)
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define_native_function(vm.names.daysInWeek, days_in_week, 1, attr);
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define_native_function(vm.names.daysInMonth, days_in_month, 1, attr);
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define_native_function(vm.names.daysInYear, days_in_year, 1, attr);
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define_native_function(vm.names.monthsInYear, months_in_year, 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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@ -357,6 +358,33 @@ JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::days_in_year)
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return Value(iso_days_in_year(iso_year(temporal_date_like.as_object())));
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}
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// 12.4.19 Temporal.Calendar.prototype.monthsInYear ( temporalDateLike ), https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.monthsinyear
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// NOTE: This is the minimum monthsInYear implementation for engines without ECMA-402.
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JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::months_in_year)
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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]] or [[InitializedTemporalYearMonth]] internal slot, then
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// TODO PlainYearMonth objects
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if (!temporal_date_like.is_object() || !is<PlainDate>(temporal_date_like.as_object())) {
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// a. Perform ? ToTemporalDate(temporalDateLike).
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(void)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 12𝔽.
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return Value(12);
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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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@ -31,6 +31,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(days_in_week);
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JS_DECLARE_NATIVE_FUNCTION(days_in_month);
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JS_DECLARE_NATIVE_FUNCTION(days_in_year);
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JS_DECLARE_NATIVE_FUNCTION(months_in_year);
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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.monthsInYear).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.monthsInYear(date)).toBe(12);
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});
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});
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