From 3ee169d8e776307c79f36522095b23b1af1e5513 Mon Sep 17 00:00:00 2001
From: Linus Groh <mail@linusgroh.de>
Date: Wed, 14 Jul 2021 21:16:40 +0100
Subject: [PATCH] LibJS: Implement Temporal.Calendar.prototype.toJSON()

---
 .../LibJS/Runtime/Temporal/CalendarPrototype.cpp   | 11 +++++++++++
 .../LibJS/Runtime/Temporal/CalendarPrototype.h     |  1 +
 .../Temporal/Calendar/Calendar.prototype.toJSON.js | 14 ++++++++++++++
 3 files changed, 26 insertions(+)
 create mode 100644 Userland/Libraries/LibJS/Tests/builtins/Temporal/Calendar/Calendar.prototype.toJSON.js

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.cpp
index 7f16ead01b..c9328811ab 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.cpp
@@ -27,6 +27,7 @@ void CalendarPrototype::initialize(GlobalObject& global_object)
 
     u8 attr = Attribute::Writable | Attribute::Configurable;
     define_native_function(vm.names.toString, to_string, 0, attr);
+    define_native_function(vm.names.toJSON, to_json, 0, attr);
 }
 
 static Calendar* typed_this(GlobalObject& global_object)
@@ -55,4 +56,14 @@ JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::to_string)
     return js_string(vm, calendar->identifier());
 }
 
+// 12.4.24 Temporal.Calendar.prototype.toJSON ( ), https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.tojson
+JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::to_json)
+{
+    // 1. Let calendar be the this value.
+    auto calendar = vm.this_value(global_object);
+
+    // 2. Return ? ToString(calendar).
+    return js_string(vm, calendar.to_string(global_object));
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.h
index aa48b08ada..229e63d749 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.h
@@ -20,6 +20,7 @@ public:
 
 private:
     JS_DECLARE_NATIVE_FUNCTION(to_string);
+    JS_DECLARE_NATIVE_FUNCTION(to_json);
 };
 
 }
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/Calendar/Calendar.prototype.toJSON.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/Calendar/Calendar.prototype.toJSON.js
new file mode 100644
index 0000000000..703283b897
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/Calendar/Calendar.prototype.toJSON.js
@@ -0,0 +1,14 @@
+describe("correct behavior", () => {
+    test("length is 0", () => {
+        expect(Temporal.Calendar.prototype.toJSON).toHaveLength(0);
+    });
+
+    test("basic functionality", () => {
+        const calendar = new Temporal.Calendar("iso8601");
+        expect(calendar.toJSON()).toBe("iso8601");
+    });
+
+    test("works with any this value", () => {
+        expect(Temporal.Calendar.prototype.toJSON.call("foo")).toBe("foo");
+    });
+});