From 0e1e8c908e59766ceafbdcbb6dd07ff0e06c5632 Mon Sep 17 00:00:00 2001
From: Pavel Shliak <shlyakpavel@gmail.com>
Date: Fri, 25 Oct 2024 15:46:39 +0400
Subject: [PATCH] LibJS: Add calendar id getter to PlainYearMonthPrototype

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

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.cpp
index a34cfa4cf01..ef5041567ee 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.cpp
@@ -34,6 +34,7 @@ void PlainYearMonthPrototype::initialize(Realm& realm)
     define_direct_property(vm.well_known_symbol_to_string_tag(), PrimitiveString::create(vm, "Temporal.PlainYearMonth"_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);
@@ -447,4 +448,16 @@ JS_DEFINE_NATIVE_FUNCTION(PlainYearMonthPrototype::get_iso_fields)
     return fields;
 }
 
+// 9.3.3 get Temporal.PlainYearMonth.prototype.calendarId
+JS_DEFINE_NATIVE_FUNCTION(PlainYearMonthPrototype::calendar_id_getter)
+{
+    // Step 1: Let yearMonth be the this value
+    // Step 2: Perform ? RequireInternalSlot(yearMonth, [[InitializedTemporalYearMonth]]).
+    auto year_month = TRY(typed_this_object(vm));
+
+    // Step 3: Return yearMonth.[[Calendar]].identifier
+    auto& calendar = static_cast<Calendar&>(year_month->calendar());
+    return PrimitiveString::create(vm, calendar.identifier());
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.h
index f5e1cbfd3ac..ab2464d9f68 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.h
@@ -23,6 +23,7 @@ private:
     explicit PlainYearMonthPrototype(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/PlainYearMonth/PlainYearMonth.prototype.calendarId.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.prototype.calendarId.js
new file mode 100644
index 00000000000..800f2413e51
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.prototype.calendarId.js
@@ -0,0 +1,15 @@
+describe("correct behavior", () => {
+    test("calendarId basic functionality", () => {
+        const calendar = "iso8601";
+        const plainYearMonth = new Temporal.PlainYearMonth(2000, 5, calendar);
+        expect(plainYearMonth.calendarId).toBe("iso8601");
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainYearMonth object", () => {
+        expect(() => {
+            Reflect.get(Temporal.PlainYearMonth.prototype, "calendarId", "foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainYearMonth");
+    });
+});