script: Implement Debug on ConstellationControlMsg to simplify script…

…_thread.rs

components/script/script_thread.rs

@@ -886,22 +886,12 @@ impl ScriptThread {
 
     fn handle_msg_from_constellation(&self, msg: ConstellationControlMsg) {
         match msg {
-            ConstellationControlMsg::AttachLayout(_) =>
-                panic!("should have handled AttachLayout already"),
             ConstellationControlMsg::Navigate(pipeline_id, subpage_id, load_data) =>
                 self.handle_navigate(pipeline_id, Some(subpage_id), load_data),
             ConstellationControlMsg::SendEvent(id, event) =>
                 self.handle_event(id, event),
             ConstellationControlMsg::ResizeInactive(id, new_size) =>
                 self.handle_resize_inactive_msg(id, new_size),
-            ConstellationControlMsg::Viewport(..) =>
-                panic!("should have handled Viewport already"),
-            ConstellationControlMsg::SetScrollState(..) =>
-                panic!("should have handled SetScrollState already"),
-            ConstellationControlMsg::Resize(..) =>
-                panic!("should have handled Resize already"),
-            ConstellationControlMsg::ExitPipeline(..) =>
-                panic!("should have handled ExitPipeline already"),
             ConstellationControlMsg::GetTitle(pipeline_id) =>
                 self.handle_get_title_msg(pipeline_id),
             ConstellationControlMsg::Freeze(pipeline_id) =>
@@ -943,6 +933,12 @@ impl ScriptThread {
                 self.handle_css_error_reporting(pipeline_id, filename, line, column, msg),
             ConstellationControlMsg::Reload(pipeline_id) =>
                 self.handle_reload(pipeline_id),
+            msg @ ConstellationControlMsg::AttachLayout(..) |
+            msg @ ConstellationControlMsg::Viewport(..) |
+            msg @ ConstellationControlMsg::SetScrollState(..) |
+            msg @ ConstellationControlMsg::Resize(..) |
+            msg @ ConstellationControlMsg::ExitPipeline(..) =>
+                      panic!("should have handled {:?} already", msg),
         }
     }
 

components/script_traits/lib.rs

@@ -61,6 +61,7 @@ use profile_traits::mem;
 use profile_traits::time as profile_time;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use std::collections::HashMap;
+use std::fmt;
 use std::sync::mpsc::{Sender, Receiver};
 use style_traits::{PagePx, ViewportPx};
 use url::Url;
@@ -207,6 +208,37 @@ pub enum ConstellationControlMsg {
     Reload(PipelineId),
 }
 
+impl fmt::Debug for ConstellationControlMsg {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        use self::ConstellationControlMsg::*;
+        write!(formatter, "ConstellationMsg::{}", match *self {
+            AttachLayout(..) => "AttachLayout",
+            Resize(..) => "Resize",
+            ResizeInactive(..) => "ResizeInactive",
+            ExitPipeline(..) => "ExitPipeline",
+            SendEvent(..) => "SendEvent",
+            Viewport(..) => "Viewport",
+            SetScrollState(..) => "SetScrollState",
+            GetTitle(..) => "GetTitle",
+            Freeze(..) => "Freeze",
+            Thaw(..) => "Thaw",
+            ChangeFrameVisibilityStatus(..) => "ChangeFrameVisibilityStatus",
+            NotifyVisibilityChange(..) => "NotifyVisibilityChange",
+            Navigate(..) => "Navigate",
+            MozBrowserEvent(..) => "MozBrowserEvent",
+            UpdateSubpageId(..) => "UpdateSubpageId",
+            FocusIFrame(..) => "FocusIFrame",
+            WebDriverScriptCommand(..) => "WebDriverScriptCommand",
+            TickAllAnimations(..) => "TickAllAnimations",
+            WebFontLoaded(..) => "WebFontLoaded",
+            DispatchFrameLoadEvent { .. } => "DispatchFrameLoadEvent",
+            FramedContentChanged(..) => "FramedContentChanged",
+            ReportCSSError(..) => "ReportCSSError",
+            Reload(..) => "Reload",
+        })
+    }
+}
+
 /// Used to determine if a script has any pending asynchronous activity.
 #[derive(Copy, Clone, Debug, PartialEq, Deserialize, Serialize)]
 pub enum DocumentState {