LibJS: Implement Intl.RelativeTimeFormat.prototype.resolvedOptions

3 files changed, 109 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.cpp b/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.cpp
index bccb8dbf4e..e61f12f97f 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.cpp
@@ -23,6 +23,33 @@ void RelativeTimeFormatPrototype::initialize(GlobalObject& global_object)
 
     // 17.4.2 Intl.RelativeTimeFormat.prototype[ @@toStringTag ], https://tc39.es/ecma402/#sec-Intl.RelativeTimeFormat.prototype-toStringTag
     define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm, "Intl.RelativeTimeFormat"sv), Attribute::Configurable);
+
+    u8 attr = Attribute::Writable | Attribute::Configurable;
+    define_native_function(vm.names.resolvedOptions, resolved_options, 0, attr);
+}
+
+// 17.4.5 Intl.RelativeTimeFormat.prototype.resolvedOptions ( ), https://tc39.es/ecma402/#sec-intl.relativetimeformat.prototype.resolvedoptions
+JS_DEFINE_NATIVE_FUNCTION(RelativeTimeFormatPrototype::resolved_options)
+{
+    // 1. Let relativeTimeFormat be the this value.
+    // 2. Perform ? RequireInternalSlot(relativeTimeFormat, [[InitializedRelativeTimeFormat]]).
+    auto* relative_time_format = TRY(typed_this_object(global_object));
+
+    // 3. Let options be ! OrdinaryObjectCreate(%Object.prototype%).
+    auto* options = Object::create(global_object, global_object.object_prototype());
+
+    // 4. For each row of Table 15, except the header row, in table order, do
+    //     a. Let p be the Property value of the current row.
+    //     b. Let v be the value of relativeTimeFormat's internal slot whose name is the Internal Slot value of the current row.
+    //     c. Assert: v is not undefined.
+    //     d. Perform ! CreateDataPropertyOrThrow(options, p, v).
+    MUST(options->create_data_property_or_throw(vm.names.locale, js_string(vm, relative_time_format->locale())));
+    MUST(options->create_data_property_or_throw(vm.names.style, js_string(vm, relative_time_format->style_string())));
+    MUST(options->create_data_property_or_throw(vm.names.numeric, js_string(vm, relative_time_format->numeric_string())));
+    MUST(options->create_data_property_or_throw(vm.names.numberingSystem, js_string(vm, relative_time_format->numbering_system())));
+
+    // 5. Return options.
+    return options;
 }
 
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.h b/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.h
index 8d40bc1595..5df2a3d52b 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.h
@@ -18,6 +18,9 @@ public:
     explicit RelativeTimeFormatPrototype(GlobalObject&);
     virtual void initialize(GlobalObject&) override;
     virtual ~RelativeTimeFormatPrototype() override = default;
+
+private:
+    JS_DECLARE_NATIVE_FUNCTION(resolved_options);
 };
 
 }
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/RelativeTimeFormat/RelativeTimeFormat.prototype.resolvedOptions.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/RelativeTimeFormat/RelativeTimeFormat.prototype.resolvedOptions.js
new file mode 100644
index 0000000000..913901855a
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/RelativeTimeFormat/RelativeTimeFormat.prototype.resolvedOptions.js
@@ -0,0 +1,79 @@
+describe("correct behavior", () => {
+    test("length is 0", () => {
+        expect(Intl.RelativeTimeFormat.prototype.resolvedOptions).toHaveLength(0);
+    });
+
+    test("locale only contains relevant extension keys", () => {
+        const en1 = new Intl.RelativeTimeFormat("en-u-ca-islamicc");
+        expect(en1.resolvedOptions().locale).toBe("en");
+
+        const en2 = new Intl.RelativeTimeFormat("en-u-nu-latn");
+        expect(en2.resolvedOptions().locale).toBe("en-u-nu-latn");
+
+        const en3 = new Intl.RelativeTimeFormat("en-u-ca-islamicc-nu-latn");
+        expect(en3.resolvedOptions().locale).toBe("en-u-nu-latn");
+    });
+
+    test("numberingSystem may be set by option", () => {
+        const en = new Intl.RelativeTimeFormat("en", { numberingSystem: "latn" });
+        expect(en.resolvedOptions().numberingSystem).toBe("latn");
+
+        const el = new Intl.RelativeTimeFormat("el", { numberingSystem: "latn" });
+        expect(el.resolvedOptions().numberingSystem).toBe("latn");
+    });
+
+    test("numberingSystem may be set by locale extension", () => {
+        const en = new Intl.RelativeTimeFormat("en-u-nu-latn");
+        expect(en.resolvedOptions().numberingSystem).toBe("latn");
+
+        const el = new Intl.RelativeTimeFormat("el-u-nu-latn");
+        expect(el.resolvedOptions().numberingSystem).toBe("latn");
+    });
+
+    test("numberingSystem option overrides locale extension", () => {
+        const el = new Intl.RelativeTimeFormat("el-u-nu-latn", { numberingSystem: "grek" });
+        expect(el.resolvedOptions().numberingSystem).toBe("grek");
+    });
+
+    test("numberingSystem option limited to known 'nu' values", () => {
+        ["latn", "arab"].forEach(numberingSystem => {
+            const en = new Intl.RelativeTimeFormat("en", { numberingSystem: numberingSystem });
+            expect(en.resolvedOptions().numberingSystem).toBe("latn");
+        });
+
+        ["latn", "arab"].forEach(numberingSystem => {
+            const en = new Intl.RelativeTimeFormat(`en-u-nu-${numberingSystem}`);
+            expect(en.resolvedOptions().numberingSystem).toBe("latn");
+        });
+
+        ["latn", "grek"].forEach(numberingSystem => {
+            const el = new Intl.RelativeTimeFormat("el", { numberingSystem: numberingSystem });
+            expect(el.resolvedOptions().numberingSystem).toBe(numberingSystem);
+        });
+
+        ["latn", "grek"].forEach(numberingSystem => {
+            const el = new Intl.RelativeTimeFormat(`el-u-nu-${numberingSystem}`);
+            expect(el.resolvedOptions().numberingSystem).toBe(numberingSystem);
+        });
+    });
+
+    test("style", () => {
+        const en1 = new Intl.RelativeTimeFormat("en");
+        expect(en1.resolvedOptions().style).toBe("long");
+
+        ["long", "short", "narrow"].forEach(style => {
+            const en2 = new Intl.RelativeTimeFormat("en", { style: style });
+            expect(en2.resolvedOptions().style).toBe(style);
+        });
+    });
+
+    test("numeric", () => {
+        const en1 = new Intl.RelativeTimeFormat("en");
+        expect(en1.resolvedOptions().numeric).toBe("always");
+
+        ["always", "auto"].forEach(numeric => {
+            const en2 = new Intl.RelativeTimeFormat("en", { numeric: numeric });
+            expect(en2.resolvedOptions().numeric).toBe(numeric);
+        });
+    });
+});