From 44fa8410c0dfac07ac1b293eab120d467ef8461a Mon Sep 17 00:00:00 2001
From: Pavel Shliak <shlyakpavel@gmail.com>
Date: Fri, 25 Oct 2024 14:48:59 +0400
Subject: [PATCH] LibJS: Add calendar id getter to PlainDateTimePrototype

---
 .../Runtime/Temporal/PlainDateTimePrototype.cpp   | 13 +++++++++++++
 .../Runtime/Temporal/PlainDateTimePrototype.h     |  1 +
 .../PlainDateTime.prototype.calendarId.js         | 15 +++++++++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.calendarId.js

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
index bec3de77b15..af19d95eec6 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
@@ -38,6 +38,7 @@ void PlainDateTimePrototype::initialize(Realm& realm)
     define_direct_property(vm.well_known_symbol_to_string_tag(), PrimitiveString::create(vm, "Temporal.PlainDateTime"_string), Attribute::Configurable);
 
     define_native_accessor(realm, vm.names.calendar, calendar_getter, {}, Attribute::Configurable);
+    define_native_accessor(realm, vm.names.calendarId, calendar_id_getter, {}, Attribute::Configurable);
     define_native_accessor(realm, vm.names.year, year_getter, {}, Attribute::Configurable);
     define_native_accessor(realm, vm.names.month, month_getter, {}, Attribute::Configurable);
     define_native_accessor(realm, vm.names.monthCode, month_code_getter, {}, Attribute::Configurable);
@@ -806,4 +807,16 @@ JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::get_iso_fields)
     return fields;
 }
 
+// 5.3.3 get Temporal.PlainDateTime.prototype.calendarId, https://tc39.es/proposal-temporal/#sec-get-temporal.plaindatetime.prototype.calendarid
+JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::calendar_id_getter)
+{
+    // 1. Let dateTime be the this value.
+    // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
+    auto temporal_date = TRY(typed_this_object(vm));
+
+    // 3. Return dateTime.[[Calendar]].
+    auto& calendar = static_cast<Calendar&>(temporal_date->calendar());
+    return PrimitiveString::create(vm, calendar.identifier());
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.h
index 7d3ef1721e9..f333433a40c 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.h
@@ -23,6 +23,7 @@ private:
     explicit PlainDateTimePrototype(Realm&);
 
     JS_DECLARE_NATIVE_FUNCTION(calendar_getter);
+    JS_DECLARE_NATIVE_FUNCTION(calendar_id_getter);
     JS_DECLARE_NATIVE_FUNCTION(year_getter);
     JS_DECLARE_NATIVE_FUNCTION(month_getter);
     JS_DECLARE_NATIVE_FUNCTION(month_code_getter);
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.calendarId.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.calendarId.js
new file mode 100644
index 00000000000..25e1c5cfb2a
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.calendarId.js
@@ -0,0 +1,15 @@
+describe("correct behavior", () => {
+    test("calendarId basic functionality", () => {
+        const calendar = "iso8601";
+        const plainDateTime = new Temporal.PlainDateTime(2000, 5, 1, 12, 30, 0, calendar);
+        expect(plainDateTime.calendarId).toBe("iso8601");
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainDateTime object", () => {
+        expect(() => {
+            Reflect.get(Temporal.PlainDateTime.prototype, "calendarId", "foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainDateTime");
+    });
+});