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

Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h

@@ -173,6 +173,7 @@ namespace JS {
     P(getInt8)                               \
     P(getInt16)                              \
     P(getInt32)                              \
+    P(getISOFields)                          \
     P(getMilliseconds)                       \
     P(getMinutes)                            \
     P(getMonth)                              \
@@ -227,6 +228,15 @@ namespace JS {
     P(isSafeInteger)                         \
     P(isSealed)                              \
     P(isView)                                \
+    P(isoDay)                                \
+    P(isoHour)                               \
+    P(isoMicrosecond)                        \
+    P(isoMillisecond)                        \
+    P(isoMinute)                             \
+    P(isoMonth)                              \
+    P(isoNanosecond)                         \
+    P(isoSecond)                             \
+    P(isoYear)                               \
     P(italics)                               \
     P(join)                                  \
     P(keyFor)                                \

Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp

@@ -31,6 +31,7 @@ void PlainDateTimePrototype::initialize(GlobalObject& global_object)
     u8 attr = Attribute::Writable | Attribute::Configurable;
     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.getISOFields, get_iso_fields, 0, attr);
 }
 
 static PlainDateTime* typed_this(GlobalObject& global_object)
@@ -80,4 +81,51 @@ JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::to_plain_date)
     return create_temporal_date(global_object, date_time->iso_year(), date_time->iso_month(), date_time->iso_day(), date_time->calendar());
 }
 
+// 5.3.41 Temporal.PlainDateTime.prototype.getISOFields ( ), https://tc39.es/proposal-temporal/#sec-temporal.plaindatetime.prototype.getisofields
+JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::get_iso_fields)
+{
+    // 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 fields be ! OrdinaryObjectCreate(%Object.prototype%).
+    auto* fields = Object::create(global_object, global_object.object_prototype());
+
+    // 4. Perform ! CreateDataPropertyOrThrow(fields, "calendar", dateTime.[[Calendar]]).
+    fields->create_data_property_or_throw(vm.names.calendar, Value(&date_time->calendar()));
+
+    // 5. Perform ! CreateDataPropertyOrThrow(fields, "isoDay", 𝔽(dateTime.[[ISODay]])).
+    fields->create_data_property_or_throw(vm.names.isoDay, Value(date_time->iso_day()));
+
+    // 6. Perform ! CreateDataPropertyOrThrow(fields, "isoHour", 𝔽(dateTime.[[ISOHour]])).
+    fields->create_data_property_or_throw(vm.names.isoHour, Value(date_time->iso_hour()));
+
+    // 7. Perform ! CreateDataPropertyOrThrow(fields, "isoMicrosecond", 𝔽(dateTime.[[ISOMicrosecond]])).
+    fields->create_data_property_or_throw(vm.names.isoMicrosecond, Value(date_time->iso_microsecond()));
+
+    // 8. Perform ! CreateDataPropertyOrThrow(fields, "isoMillisecond", 𝔽(dateTime.[[ISOMillisecond]])).
+    fields->create_data_property_or_throw(vm.names.isoMillisecond, Value(date_time->iso_millisecond()));
+
+    // 9. Perform ! CreateDataPropertyOrThrow(fields, "isoMinute", 𝔽(dateTime.[[ISOMinute]])).
+    fields->create_data_property_or_throw(vm.names.isoMinute, Value(date_time->iso_minute()));
+
+    // 10. Perform ! CreateDataPropertyOrThrow(fields, "isoMonth", 𝔽(dateTime.[[ISOMonth]])).
+    fields->create_data_property_or_throw(vm.names.isoMonth, Value(date_time->iso_month()));
+
+    // 11. Perform ! CreateDataPropertyOrThrow(fields, "isoNanosecond", 𝔽(dateTime.[[ISONanosecond]])).
+    fields->create_data_property_or_throw(vm.names.isoNanosecond, Value(date_time->iso_nanosecond()));
+
+    // TODO: Typo in the spec? ([[Second]] -> [[ISOSecond]])
+    // 12. Perform ! CreateDataPropertyOrThrow(fields, "isoSecond", 𝔽(dateTime.[[Second]])).
+    fields->create_data_property_or_throw(vm.names.isoSecond, Value(date_time->iso_second()));
+
+    // 13. Perform ! CreateDataPropertyOrThrow(fields, "isoYear", 𝔽(dateTime.[[ISOYear]])).
+    fields->create_data_property_or_throw(vm.names.isoYear, Value(date_time->iso_year()));
+
+    // 14. Return fields.
+    return fields;
+}
+
 }

Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.h

@@ -22,6 +22,7 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(calendar_getter);
     JS_DECLARE_NATIVE_FUNCTION(value_of);
     JS_DECLARE_NATIVE_FUNCTION(to_plain_date);
+    JS_DECLARE_NATIVE_FUNCTION(get_iso_fields);
 };
 
 }

Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.getISOFields.js

@@ -0,0 +1,47 @@
+describe("normal behavior", () => {
+    test("length is 0", () => {
+        expect(Temporal.PlainDateTime.prototype.getISOFields).toHaveLength(0);
+    });
+
+    test("basic functionality", () => {
+        const calendar = new Temporal.Calendar("iso8601");
+        const plainDateTime = new Temporal.PlainDateTime(
+            2021,
+            7,
+            23,
+            0,
+            42,
+            18,
+            123,
+            456,
+            789,
+            calendar
+        );
+        const fields = plainDateTime.getISOFields();
+        expect(fields).toEqual({
+            calendar: calendar,
+            isoDay: 23,
+            isoHour: 0,
+            isoMicrosecond: 200,
+            isoMillisecond: 123,
+            isoMinute: 42,
+            isoMonth: 7,
+            isoNanosecond: 21,
+            isoSecond: 18,
+            isoYear: 2021,
+        });
+        // Test field order
+        expect(Object.getOwnPropertyNames(fields)).toEqual([
+            "calendar",
+            "isoDay",
+            "isoHour",
+            "isoMicrosecond",
+            "isoMillisecond",
+            "isoMinute",
+            "isoMonth",
+            "isoNanosecond",
+            "isoSecond",
+            "isoYear",
+        ]);
+    });
+});