LibJS: Implement Temporal.ZonedDateTime.prototype.calendar

3 files changed, 49 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
index b1f71335fe..0322846dd1 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
@@ -4,7 +4,9 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/TypeCasts.h>
 #include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Temporal/ZonedDateTime.h>
 #include <LibJS/Runtime/Temporal/ZonedDateTimePrototype.h>
 
 namespace JS::Temporal {
@@ -23,6 +25,34 @@ void ZonedDateTimePrototype::initialize(GlobalObject& global_object)
 
     // 6.3.2 Temporal.ZonedDateTime.prototype[ @@toStringTag ], https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.prototype-@@tostringtag
     define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm.heap(), "Temporal.ZonedDateTime"), Attribute::Configurable);
+
+    define_native_accessor(vm.names.calendar, calendar_getter, {}, Attribute::Configurable);
+}
+
+static ZonedDateTime* typed_this(GlobalObject& global_object)
+{
+    auto& vm = global_object.vm();
+    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    if (!this_object)
+        return {};
+    if (!is<ZonedDateTime>(this_object)) {
+        vm.throw_exception<TypeError>(global_object, ErrorType::NotA, "Temporal.ZonedDateTime");
+        return {};
+    }
+    return static_cast<ZonedDateTime*>(this_object);
+}
+
+// 6.3.3 get Temporal.ZonedDateTime.prototype.calendar, https://tc39.es/proposal-temporal/#sec-get-temporal.zoneddatetime.prototype.calendar
+JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::calendar_getter)
+{
+    // 1. Let zonedDateTime be the this value.
+    // 2. Perform ? RequireInternalSlot(zonedDateTime, [[InitializedTemporalZonedDateTime]]).
+    auto* zoned_date_time = typed_this(global_object);
+    if (vm.exception())
+        return {};
+
+    // 3. Return zonedDateTime.[[Calendar]].
+    return Value(&zoned_date_time->calendar());
 }
 
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.h
index 64be549401..dcfcaf392b 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.h
@@ -17,6 +17,9 @@ public:
     explicit ZonedDateTimePrototype(GlobalObject&);
     virtual void initialize(GlobalObject&) override;
     virtual ~ZonedDateTimePrototype() override = default;
+
+private:
+    JS_DECLARE_NATIVE_FUNCTION(calendar_getter);
 };
 
 }
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.calendar.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.calendar.js
new file mode 100644
index 0000000000..b8655eb7d9
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.calendar.js
@@ -0,0 +1,16 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        const timeZone = new Temporal.TimeZone("UTC");
+        const calendar = new Temporal.Calendar("iso8601");
+        const zonedDateTime = new Temporal.ZonedDateTime(0n, timeZone, calendar);
+        expect(zonedDateTime.calendar).toBe(calendar);
+    });
+});
+
+test("errors", () => {
+    test("this value must be a Temporal.ZonedDateTime object", () => {
+        expect(() => {
+            Reflect.get(Temporal.ZonedDateTime.prototype, "calendar", "foo");
+        }).toThrowWithMessage(TypeError, "Not a Temporal.ZonedDateTime");
+    });
+});