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LibJS: Implement Temporal.PlainDate.prototype.subtract()

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This commit is contained in:
Linus Groh 2021-11-02 12:57:44 +01:00
parent bcd96c80f3
commit 654380c2c2
3 changed files with 41 additions and 0 deletions
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21
Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.cpp
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@ -54,6 +54,7 @@ void PlainDatePrototype::initialize(GlobalObject& global_object)
define_native_function(vm.names.toPlainMonthDay, to_plain_month_day, 0, attr);
define_native_function(vm.names.getISOFields, get_iso_fields, 0, attr);
define_native_function(vm.names.add, add, 1, attr);
define_native_function(vm.names.subtract, subtract, 1, attr);
define_native_function(vm.names.withCalendar, with_calendar, 1, attr);
define_native_function(vm.names.equals, equals, 1, attr);
define_native_function(vm.names.toPlainDateTime, to_plain_date_time, 0, attr);
@ -353,6 +354,26 @@ JS_DEFINE_NATIVE_FUNCTION(PlainDatePrototype::add)
return TRY(calendar_date_add(global_object, temporal_date->calendar(), *temporal_date, *duration, options));
}
// 3.3.20 Temporal.PlainDate.prototype.subtract ( temporalDurationLike [ , options ] ), https://tc39.es/proposal-temporal/#sec-temporal.plaindate.prototype.subtract
JS_DEFINE_NATIVE_FUNCTION(PlainDatePrototype::subtract)
{
// 1. Let temporalDate be the this value.
// 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
auto* temporal_date = TRY(typed_this_object(global_object));
// 3. Let duration be ? ToTemporalDuration(temporalDurationLike).
auto* duration = TRY(to_temporal_duration(global_object, vm.argument(0)));
// 4. Set options to ? GetOptionsObject(options).
auto* options = TRY(get_options_object(global_object, vm.argument(1)));
// 5. Let negatedDuration be ! CreateNegatedTemporalDuration(duration).
auto* negated_duration = create_negated_temporal_duration(global_object, *duration);
// 6. Return ? CalendarDateAdd(temporalDate.[[Calendar]], temporalDate, negatedDuration, options).
return TRY(calendar_date_add(global_object, temporal_date->calendar(), *temporal_date, *negated_duration, options));
}
// 3.3.22 Temporal.PlainDate.prototype.withCalendar ( calendar ), https://tc39.es/proposal-temporal/#sec-temporal.plaindate.prototype.withcalendar
JS_DEFINE_NATIVE_FUNCTION(PlainDatePrototype::with_calendar)
{

1
Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.h
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@ -39,6 +39,7 @@ private:
JS_DECLARE_NATIVE_FUNCTION(to_plain_month_day);
JS_DECLARE_NATIVE_FUNCTION(get_iso_fields);
JS_DECLARE_NATIVE_FUNCTION(add);
JS_DECLARE_NATIVE_FUNCTION(subtract);
JS_DECLARE_NATIVE_FUNCTION(with_calendar);
JS_DECLARE_NATIVE_FUNCTION(equals);
JS_DECLARE_NATIVE_FUNCTION(to_plain_date_time);

19
Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.subtract.js Normal file
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@ -0,0 +1,19 @@
describe("correct behavior", () => {
test("length is 1", () => {
expect(Temporal.PlainDate.prototype.subtract).toHaveLength(1);
});
test("basic functionality", () => {
const plainDate = new Temporal.PlainDate(2021, 7, 6);
const result = plainDate.subtract(new Temporal.Duration(51, 6, 0, 5));
expect(result.equals(new Temporal.PlainDate(1970, 1, 1))).toBeTrue();
});
});
describe("errors", () => {
test("this value must be a Temporal.PlainDate object", () => {
expect(() => {
Temporal.PlainDate.prototype.subtract.call("foo");
}).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainDate");
});
});