Add task_source directory

Use DOMManipulationTaskSource whenever possible

components/script/task_source/dom_manipulation.rs

@@ -0,0 +1,63 @@
+/* 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::refcounted::Trusted;
+use dom::event::{EventBubbles, EventCancelable};
+use dom::eventtarget::EventTarget;
+use script_thread::{MainThreadRunnable, MainThreadScriptMsg, Runnable, ScriptThread};
+use std::result::Result;
+use std::sync::mpsc::Sender;
+use string_cache::Atom;
+use task_source::TaskSource;
+
+#[derive(JSTraceable)]
+pub struct DOMManipulationTaskSource(pub Sender<MainThreadScriptMsg>);
+
+impl TaskSource<DOMManipulationTask> for DOMManipulationTaskSource {
+    fn queue(&self, msg: DOMManipulationTask) -> Result<(), ()> {
+        let DOMManipulationTaskSource(ref chan) = *self;
+        chan.send(MainThreadScriptMsg::DOMManipulation(msg)).map_err(|_| ())
+    }
+
+    fn clone(&self) -> Box<TaskSource<DOMManipulationTask> + Send> {
+        let DOMManipulationTaskSource(ref chan) = *self;
+        box DOMManipulationTaskSource((*chan).clone())
+    }
+}
+
+pub enum DOMManipulationTask {
+    // https://html.spec.whatwg.org/multipage/#the-end step 7
+    DocumentProgress(Box<Runnable + Send>),
+    // https://dom.spec.whatwg.org/#concept-event-fire
+    FireEvent(Atom, Trusted<EventTarget>, EventBubbles, EventCancelable),
+    // https://html.spec.whatwg.org/multipage/#fire-a-simple-event
+    FireSimpleEvent(Atom, Trusted<EventTarget>),
+    // https://html.spec.whatwg.org/multipage/#details-notification-task-steps
+    FireToggleEvent(Box<Runnable + Send>),
+    // https://html.spec.whatwg.org/multipage/#planned-navigation
+    PlannedNavigation(Box<Runnable + Send>),
+    // https://html.spec.whatwg.org/multipage/#send-a-storage-notification
+    SendStorageNotification(Box<MainThreadRunnable + Send>)
+}
+
+impl DOMManipulationTask {
+    pub fn handle_msg(self, script_thread: &ScriptThread) {
+        use self::DOMManipulationTask::*;
+
+        match self {
+            DocumentProgress(runnable) => runnable.handler(),
+            FireEvent(name, element, bubbles, cancelable) => {
+                let target = element.root();
+                target.fire_event(&*name, bubbles, cancelable);
+            }
+            FireSimpleEvent(name, element) => {
+                let target = element.root();
+                target.fire_simple_event(&*name);
+            }
+            FireToggleEvent(runnable) => runnable.handler(),
+            PlannedNavigation(runnable) => runnable.handler(),
+            SendStorageNotification(runnable) => runnable.handler(script_thread)
+        }
+    }
+}