1 files changed, 47 insertions, 0 deletions
diff --git a/ide/wg_RoutedMessageViews.ml b/ide/wg_RoutedMessageViews.ml
new file mode 100644
index 000000000..4bd303524
--- /dev/null
+++ b/ide/wg_RoutedMessageViews.ml
@@ -0,0 +1,47 @@
+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+class type message_views_router = object
+  method route : int -> Wg_MessageView.message_view
+  method default_route : Wg_MessageView.message_view
+
+  method has_selection : bool
+  method get_selected_text : string
+
+  method register_route : int -> Wg_MessageView.message_view -> unit
+  method delete_route : int -> unit
+end
+
+let message_views ~route_0 : message_views_router =
+  let route_table = Hashtbl.create 17 in
+  let () = Hashtbl.add route_table 0 route_0 in
+object
+  method route i =
+    try Hashtbl.find route_table i
+    with Not_found ->
+      (* at least the message will be printed somewhere*)
+      Hashtbl.find route_table 0
+
+  method default_route = route_0
+
+  method register_route i mv = Hashtbl.add route_table i mv
+
+  method delete_route i = Hashtbl.remove route_table i
+
+  method has_selection =
+    Hashtbl.fold (fun _ v -> (||) v#has_selection) route_table false
+
+  method get_selected_text =
+    Option.default ""
+      (Hashtbl.fold (fun _ v acc ->
+         if v#has_selection then Some v#get_selected_text else acc)
+      route_table None)
+
+end