Implement unhandledrejection event

components/script/dom/promiserejectionevent.rs

@@ -0,0 +1,114 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use dom::bindings::codegen::Bindings::EventBinding::EventMethods;
+use dom::bindings::codegen::Bindings::PromiseRejectionEventBinding;
+use dom::bindings::codegen::Bindings::PromiseRejectionEventBinding::PromiseRejectionEventMethods;
+use dom::bindings::error::Fallible;
+use dom::bindings::inheritance::Castable;
+use dom::bindings::reflector::reflect_dom_object;
+use dom::bindings::root::DomRoot;
+use dom::bindings::str::DOMString;
+use dom::bindings::trace::RootedTraceableBox;
+use dom::event::{Event, EventBubbles, EventCancelable};
+use dom::globalscope::GlobalScope;
+use dom::promise::Promise;
+use dom_struct::dom_struct;
+use js::jsapi::{Heap, JSContext};
+use js::jsval::JSVal;
+use js::rust::HandleValue;
+use servo_atoms::Atom;
+use std::rc::Rc;
+
+#[dom_struct]
+pub struct PromiseRejectionEvent {
+    event: Event,
+    #[ignore_malloc_size_of = "Rc"]
+    promise: Rc<Promise>,
+    #[ignore_malloc_size_of = "Defined in rust-mozjs"]
+    reason: Heap<JSVal>,
+}
+
+impl PromiseRejectionEvent {
+    #[allow(unrooted_must_root)]
+    fn new_inherited(promise: Rc<Promise>) -> Self {
+        PromiseRejectionEvent {
+            event: Event::new_inherited(),
+            promise,
+            reason: Heap::default()
+        }
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(
+        global: &GlobalScope,
+        type_: Atom,
+        bubbles: EventBubbles,
+        cancelable: EventCancelable,
+        promise: Rc<Promise>,
+        reason: HandleValue
+    ) -> DomRoot<Self> {
+        let ev = reflect_dom_object(
+            Box::new(PromiseRejectionEvent::new_inherited(promise)),
+            global,
+            PromiseRejectionEventBinding::Wrap
+        );
+
+        {
+            let event = ev.upcast::<Event>();
+            event.init_event(
+                type_,
+                bool::from(bubbles),
+                bool::from(cancelable)
+            );
+
+            ev.reason.set(reason.get());
+        }
+        ev
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn Constructor(
+        global: &GlobalScope,
+        type_: DOMString,
+        init: RootedTraceableBox<PromiseRejectionEventBinding::PromiseRejectionEventInit>
+    ) -> Fallible<DomRoot<Self>> {
+        let reason = init.reason.handle();
+        let promise = match init.promise.as_ref() {
+            Some(promise) => promise.clone(),
+            None => Promise::new(global)
+        };
+        let bubbles = EventBubbles::from(init.parent.bubbles);
+        let cancelable = EventCancelable::from(init.parent.cancelable);
+
+        let event = PromiseRejectionEvent::new(
+            global,
+            Atom::from(type_),
+            bubbles,
+            cancelable,
+            promise,
+            reason
+        );
+        Ok(event)
+    }
+}
+
+impl PromiseRejectionEventMethods for PromiseRejectionEvent {
+    #[allow(unrooted_must_root)]
+    // https://html.spec.whatwg.org/multipage/#dom-promiserejectionevent-promise
+    fn Promise(&self) -> Rc<Promise> {
+        self.promise.clone()
+    }
+
+    #[allow(unsafe_code)]
+    // https://html.spec.whatwg.org/multipage/#dom-promiserejectionevent-reason
+    unsafe fn Reason(&self, _cx: *mut JSContext) -> JSVal {
+        self.reason.get()
+    }
+
+    // https://dom.spec.whatwg.org/#dom-event-istrusted
+    fn IsTrusted(&self) -> bool {
+        self.event.IsTrusted()
+    }
+}