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LibJS: Implement Temporal.PlainDateTime.prototype.toPlainMonthDay()

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Linus Groh 2021-08-23 23:27:41 +01:00 committed by Andreas Kling
parent 5573efa3bd
commit fc58f93734
Notes: sideshowbarker 2024-07-18 05:20:16 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/fc58f937349
Pull-request: https://github.com/SerenityOS/serenity/pull/9589
3 changed files with 41 additions and 0 deletions
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27
Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
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@ -56,6 +56,7 @@ void PlainDateTimePrototype::initialize(GlobalObject& global_object)
define_native_function(vm.names.valueOf, value_of, 0, attr);
define_native_function(vm.names.toPlainDate, to_plain_date, 0, attr);
define_native_function(vm.names.toPlainYearMonth, to_plain_year_month, 0, attr);
define_native_function(vm.names.toPlainMonthDay, to_plain_month_day, 0, attr);
define_native_function(vm.names.toPlainTime, to_plain_time, 0, attr);
define_native_function(vm.names.getISOFields, get_iso_fields, 0, attr);
}
@ -444,6 +445,32 @@ JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::to_plain_year_month)
return year_month_from_fields(global_object, calendar, *fields);
}
// 5.3.39 Temporal.PlainDateTime.prototype.toPlainMonthDay ( ), https://tc39.es/proposal-temporal/#sec-temporal.plaindatetime.prototype.toplainmonthday
JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::to_plain_month_day)
{
// 1. Let dateTime be the this value.
// 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
auto* date_time = typed_this(global_object);
if (vm.exception())
return {};
// 3. Let calendar be dateTime.[[Calendar]].
auto& calendar = date_time->calendar();
// 4. Let fieldNames be ? CalendarFields(calendar, « "day", "monthCode" »).
auto field_names = calendar_fields(global_object, calendar, { "day"sv, "monthCode"sv });
if (vm.exception())
return {};
// 5. Let fields be ? PrepareTemporalFields(dateTime, fieldNames, «»).
auto* fields = prepare_temporal_fields(global_object, *date_time, field_names, {});
if (vm.exception())
return {};
// 6. Return ? MonthDayFromFields(calendar, fields).
return month_day_from_fields(global_object, calendar, *fields);
}
// 5.3.40 Temporal.PlainDateTime.prototype.toPlainTime ( ), https://tc39.es/proposal-temporal/#sec-temporal.plaindatetime.prototype.toplaintime
JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::to_plain_time)
{

1
Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.h
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@ -43,6 +43,7 @@ private:
JS_DECLARE_NATIVE_FUNCTION(value_of);
JS_DECLARE_NATIVE_FUNCTION(to_plain_date);
JS_DECLARE_NATIVE_FUNCTION(to_plain_year_month);
JS_DECLARE_NATIVE_FUNCTION(to_plain_month_day);
JS_DECLARE_NATIVE_FUNCTION(to_plain_time);
JS_DECLARE_NATIVE_FUNCTION(get_iso_fields);
};

13
Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.toPlainMonthDay.js Normal file
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@ -0,0 +1,13 @@
describe("correct behavior", () => {
test("length is 0", () => {
expect(Temporal.PlainDateTime.prototype.toPlainMonthDay).toHaveLength(0);
});
test("basic functionality", () => {
const plainDateTime = new Temporal.PlainDateTime(2021, 7, 6, 18, 14, 47);
const plainMonthDay = plainDateTime.toPlainMonthDay();
expect(plainMonthDay.calendar).toBe(plainDateTime.calendar);
expect(plainMonthDay.monthCode).toBe("M07");
expect(plainMonthDay.day).toBe(6);
});
});