LibJS: Extend Intl.DisplayNames.of to support script tags

Author: https://github.com/trflynn89
Commit: a029e3d38a
Pull-request: https://github.com/SerenityOS/serenity/pull/9622
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibJS/Runtime/Intl/DisplayNamesPrototype.cpp

@@ -83,6 +83,7 @@ JS_DEFINE_NATIVE_FUNCTION(DisplayNamesPrototype::of)
         result = Unicode::get_locale_territory_mapping(display_names->locale(), code.as_string().string());
         break;
     case DisplayNames::Type::Script:
+        result = Unicode::get_locale_script_mapping(display_names->locale(), code.as_string().string());
         break;
     case DisplayNames::Type::Currency:
         break;

Userland/Libraries/LibJS/Tests/builtins/Intl/DisplayNames/DisplayNames.prototype.of.js

@@ -58,4 +58,19 @@ describe("correct behavior", () => {
         expect(es419.of("AA")).toBe("AA");
         expect(zhHant.of("AA")).toBe("AA");
     });
+
+    test("option type script", () => {
+        const en = new Intl.DisplayNames("en", { type: "script" });
+        expect(en.of("Latn")).toBe("Latin");
+
+        const es419 = new Intl.DisplayNames("es-419", { type: "script" });
+        expect(es419.of("Latn")).toBe("latín");
+
+        const zhHant = new Intl.DisplayNames(["zh-Hant"], { type: "script" });
+        expect(zhHant.of("Latn")).toBe("拉丁文");
+
+        expect(en.of("Aaaa")).toBe("Aaaa");
+        expect(es419.of("Aaaa")).toBe("Aaaa");
+        expect(zhHant.of("Aaaa")).toBe("Aaaa");
+    });
 });