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LibJS: Implement Temporal.Calendar.prototype.dayOfWeek
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@ -106,6 +106,7 @@ namespace JS {
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P(create) \
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P(dateFromFields) \
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P(day) \
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P(dayOfWeek) \
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P(days) \
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P(debug) \
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P(decodeURI) \
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@ -386,6 +386,26 @@ i32 iso_days_in_month(i32 year, i32 month)
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return 28;
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}
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// 12.1.33 ToISODayOfWeek ( year, month, day ), https://tc39.es/proposal-temporal/#sec-temporal-toisodayofweek
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u8 to_iso_day_of_week(i32 year, u8 month, u8 day)
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{
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// 1. Assert: year is an integer.
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// 2. Assert: month is an integer.
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// 3. Assert: day is an integer.
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// 4. Let date be the date given by year, month, and day.
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// 5. Return date's day of the week according to ISO-8601.
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// NOTE: Implemented based on https://cs.uwaterloo.ca/~alopez-o/math-faq/node73.html
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auto normalized_month = month + (month < 3 ? 10 : -2);
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auto normalized_year = year - (month < 3 ? 1 : 0);
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auto century = normalized_year / 100;
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auto truncated_year = normalized_year - (century * 100);
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auto result = (day + static_cast<u8>((2.6 * normalized_month) - 0.2) - (2 * century) + truncated_year + (truncated_year / 4) + (century / 4)) % 7;
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if (result <= 0) // Mathematical modulo
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result += 7;
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return result;
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}
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// 12.1.36 BuildISOMonthCode ( month ), https://tc39.es/proposal-temporal/#sec-buildisomonthcode
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String build_iso_month_code(i32 month)
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{
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@ -45,6 +45,7 @@ PlainDate* date_from_fields(GlobalObject&, Object& calendar, Object& fields, Obj
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bool calendar_equals(GlobalObject&, Object& one, Object& two);
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bool is_iso_leap_year(i32 year);
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i32 iso_days_in_month(i32 year, i32 month);
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u8 to_iso_day_of_week(i32 year, u8 month, u8 day);
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String build_iso_month_code(i32 month);
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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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@ -35,6 +35,7 @@ void CalendarPrototype::initialize(GlobalObject& global_object)
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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.day, day, 1, attr);
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define_native_function(vm.names.dayOfWeek, day_of_week, 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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@ -208,6 +209,28 @@ JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::day)
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return Value(iso_day(temporal_date_like.as_object()));
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}
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// 12.4.13 Temporal.Calendar.prototype.dayOfWeek ( temporalDateLike ), https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.dayofweek
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// NOTE: This is the minimum dayOfWeek implementation for engines without ECMA-402.
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JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::day_of_week)
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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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// 4. Let temporalDate be ? ToTemporalDate(temporalDateLike).
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auto* temporal_date = to_temporal_date(global_object, vm.argument(0));
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if (vm.exception())
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return {};
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// 5. Return 𝔽(! ToISODayOfWeek(temporalDate.[[ISOYear]], temporalDate.[[ISOMonth]], temporalDate.[[ISODay]])).
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return Value(to_iso_day_of_week(temporal_date->iso_year(), temporal_date->iso_month(), temporal_date->iso_day()));
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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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@ -25,6 +25,7 @@ private:
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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(day);
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JS_DECLARE_NATIVE_FUNCTION(day_of_week);
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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.dayOfWeek).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.dayOfWeek(date)).toBe(5);
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});
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});
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