From f7cf7382c9b4502b4292ed6aa592cfe4727ec9cf Mon Sep 17 00:00:00 2001
From: Pavel Shliak <shlyakpavel@gmail.com>
Date: Fri, 25 Oct 2024 14:47:48 +0400
Subject: [PATCH] LibJS: Add calendar id getter to PlainDatePrototype

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

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.cpp
index 47d6ab105d9..918289b83c0 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.cpp
@@ -52,6 +52,7 @@ void PlainDatePrototype::initialize(Realm& realm)
     define_native_accessor(realm, vm.names.inLeapYear, in_leap_year_getter, {}, Attribute::Configurable);
     define_native_accessor(realm, vm.names.era, era_getter, {}, Attribute::Configurable);
     define_native_accessor(realm, vm.names.eraYear, era_year_getter, {}, Attribute::Configurable);
+    define_native_accessor(realm, vm.names.calendarId, calendar_id_getter, {}, Attribute::Configurable);
 
     u8 attr = Attribute::Writable | Attribute::Configurable;
     define_native_function(realm, vm.names.toPlainYearMonth, to_plain_year_month, 0, attr);
@@ -649,4 +650,16 @@ JS_DEFINE_NATIVE_FUNCTION(PlainDatePrototype::value_of)
     return vm.throw_completion<TypeError>(ErrorType::Convert, "Temporal.PlainDate", "a primitive value");
 }
 
+// 3.3.3 get Temporal.PlainDate.prototype.calendarId, https://tc39.es/proposal-temporal/#sec-get-temporal.plaindate.prototype.calendarid
+JS_DEFINE_NATIVE_FUNCTION(PlainDatePrototype::calendar_id_getter)
+{
+    // 1. Let temporalDate be the this value.
+    // 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
+    auto temporal_date = TRY(typed_this_object(vm));
+
+    // 3. Return temporalDate.[[Calendar]].
+    auto& calendar = static_cast<Calendar&>(temporal_date->calendar());
+    return PrimitiveString::create(vm, calendar.identifier());
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.h
index 9a909ed423e..8b988229634 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDatePrototype.h
@@ -23,6 +23,7 @@ private:
     explicit PlainDatePrototype(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/PlainDate/PlainDate.prototype.calendarId.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.calendarId.js
new file mode 100644
index 00000000000..ae43185fd4f
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.calendarId.js
@@ -0,0 +1,15 @@
+describe("correct behavior", () => {
+    test("calendarId basic functionality", () => {
+        const calendar = "iso8601";
+        const plainDate = new Temporal.PlainDate(2000, 5, 1, calendar);
+        expect(plainDate.calendarId).toBe("iso8601");
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainDate object", () => {
+        expect(() => {
+            Reflect.get(Temporal.PlainDate.prototype, "calendarId", "foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainDate");
+    });
+});