LibJS: Implement Temporal.Duration.prototype.sign/blank

Author: https://github.com/trflynn89
Commit: https://github.com/LadybirdBrowser/ladybird/commit/dfaa3bf6497
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2431
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/shannonbooth ✅

Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp

@@ -31,6 +31,9 @@ void DurationPrototype::initialize(Realm& realm)
     define_native_accessor(realm, vm.names.unit, unit##_getter, {}, Attribute::Configurable);
     JS_ENUMERATE_DURATION_UNITS
 #undef __JS_ENUMERATE
+
+    define_native_accessor(realm, vm.names.sign, sign_getter, {}, Attribute::Configurable);
+    define_native_accessor(realm, vm.names.blank, blank_getter, {}, Attribute::Configurable);
 }
 
 // 7.3.3 get Temporal.Duration.prototype.years, https://tc39.es/proposal-temporal/#sec-get-temporal.duration.prototype.years
@@ -56,4 +59,30 @@ void DurationPrototype::initialize(Realm& realm)
 JS_ENUMERATE_DURATION_UNITS
 #undef __JS_ENUMERATE
 
+// 7.3.13 get Temporal.Duration.prototype.sign, https://tc39.es/proposal-temporal/#sec-get-temporal.duration.prototype.sign
+JS_DEFINE_NATIVE_FUNCTION(DurationPrototype::sign_getter)
+{
+    // 1. Let duration be the this value.
+    // 2. Perform ? RequireInternalSlot(duration, [[InitializedTemporalDuration]]).
+    auto duration = TRY(typed_this_object(vm));
+
+    // 3. Return 𝔽(DurationSign(duration)).
+    return duration_sign(duration);
+}
+
+// 7.3.14 get Temporal.Duration.prototype.blank, https://tc39.es/proposal-temporal/#sec-get-temporal.duration.prototype.blank
+JS_DEFINE_NATIVE_FUNCTION(DurationPrototype::blank_getter)
+{
+    // 1. Let duration be the this value.
+    // 2. Perform ? RequireInternalSlot(duration, [[InitializedTemporalDuration]]).
+    auto duration = TRY(typed_this_object(vm));
+
+    // 3. If DurationSign(duration) = 0, return true.
+    if (duration_sign(duration) == 0)
+        return true;
+
+    // 4. Return false.
+    return false;
+}
+
 }

Libraries/LibJS/Runtime/Temporal/DurationPrototype.h

@@ -27,6 +27,9 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(unit##_getter);
     JS_ENUMERATE_DURATION_UNITS
 #undef __JS_ENUMERATE
+
+    JS_DECLARE_NATIVE_FUNCTION(sign_getter);
+    JS_DECLARE_NATIVE_FUNCTION(blank_getter);
 };
 
 }

Libraries/LibJS/Tests/builtins/Temporal/Duration/Duration.prototype.blank.js

@@ -0,0 +1,17 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        const nonBlankDuration = new Temporal.Duration(123);
+        expect(nonBlankDuration.blank).toBeFalse();
+
+        const blankDuration = new Temporal.Duration(0);
+        expect(blankDuration.blank).toBeTrue();
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.Duration object", () => {
+        expect(() => {
+            Reflect.get(Temporal.Duration.prototype, "blank", "foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.Duration");
+    });
+});

Libraries/LibJS/Tests/builtins/Temporal/Duration/Duration.prototype.sign.js

@@ -0,0 +1,17 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        const positiveDuration = new Temporal.Duration(123);
+        expect(positiveDuration.sign).toBe(1);
+
+        const negativeDuration = new Temporal.Duration(-123);
+        expect(negativeDuration.sign).toBe(-1);
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.Duration object", () => {
+        expect(() => {
+            Reflect.get(Temporal.Duration.prototype, "sign", "foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.Duration");
+    });
+});