LibWeb: Implement JS confirm()

Libraries/LibWeb/Bindings/WindowObject.cpp

@@ -46,6 +46,7 @@ WindowObject::WindowObject(Window& impl)
     put("window", this);
     put_native_property("document", document_getter, document_setter);
     put_native_function("alert", alert);
+    put_native_function("confirm", confirm);
     put_native_function("setInterval", set_interval, 1);
     put_native_function("setTimeout", set_timeout, 1);
     put_native_function("requestAnimationFrame", request_animation_frame, 1);
@@ -96,6 +97,17 @@ JS::Value WindowObject::alert(JS::Interpreter& interpreter)
     return JS::js_undefined();
 }
 
+JS::Value WindowObject::confirm(JS::Interpreter& interpreter)
+{
+    auto* impl = impl_from(interpreter);
+    if (!impl)
+        return {};
+    auto& arguments = interpreter.call_frame().arguments;
+    if (arguments.size() < 1)
+        return {};
+    return JS::Value(impl->confirm(arguments[0].to_string()));
+}
+
 JS::Value WindowObject::set_interval(JS::Interpreter& interpreter)
 {
     auto* impl = impl_from(interpreter);

Libraries/LibWeb/Bindings/WindowObject.h

@@ -51,6 +51,7 @@ private:
     static void document_setter(JS::Interpreter&, JS::Value);
 
     static JS::Value alert(JS::Interpreter&);
+    static JS::Value confirm(JS::Interpreter&);
     static JS::Value set_interval(JS::Interpreter&);
     static JS::Value set_timeout(JS::Interpreter&);
     static JS::Value request_animation_frame(JS::Interpreter&);

Libraries/LibWeb/DOM/Window.cpp

@@ -52,6 +52,12 @@ void Window::alert(const String& message)
     GUI::MessageBox::show(message, "Alert", GUI::MessageBox::Type::Information);
 }
 
+bool Window::confirm(const String& message)
+{
+    auto confirm_result = GUI::MessageBox::show(message, "Confirm", GUI::MessageBox::Type::Warning, GUI::MessageBox::InputType::OKCancel);
+    return confirm_result == GUI::Dialog::ExecResult::ExecOK;
+}
+
 void Window::set_interval(JS::Function& callback, i32 interval)
 {
     // FIXME: This leaks the interval timer and makes it unstoppable.

Libraries/LibWeb/DOM/Window.h

@@ -43,6 +43,7 @@ public:
     Document& document() { return m_document; }
 
     void alert(const String&);
+    bool confirm(const String&);
     i32 request_animation_frame(JS::Function&);
     void cancel_animation_frame(i32);
     void set_interval(JS::Function&, i32);