end
+class currentProof =
+ let fail () = failwith "No current proof" in
+ object (self)
+ val mutable _proof: MatitaTypes.proof option = None
+ val mutable observers = []
+ val mutable callbacks = []
+
+ initializer self#connect `Abort (fun () -> _proof <- None; false)
+
+ (** execute all callbacks related to a given event until one of them
+ * return true or the end of the callback list is reached *)
+ method private do_callbacks event =
+ let rec aux = function
+ | [] -> ()
+ | (event', f) :: tl when event' = event -> if not (f ()) then aux tl
+ | _ :: tl -> aux tl
+ in
+ aux callbacks
+
+ method addObserver o = observers <- o :: observers
+
+ method connect (event:[`Abort|`Quit]) f =
+ callbacks <- (event, f) :: callbacks
+
+ method onGoing () = _proof <> None
+ method proof = match _proof with None -> fail () | Some proof -> proof
+ method start (proof: MatitaTypes.proof) =
+ List.iter
+ (fun observer ->
+ ignore (proof#attach_observer
+ ~interested_in:StatefulProofEngine.all_events observer))
+ observers;
+ proof#notify;
+ _proof <- Some proof
+ method abort () = self#do_callbacks `Abort
+ method quit () = self#do_callbacks `Quit
+ end
+
let proof ?uri ~metasenv ~typ () =
let metasenv = (1, [], typ) :: metasenv in
let body = Cic.Meta (1,[]) in
let _ = CicTypeChecker.type_of_aux' metasenv [] typ in
new proof ~typ ~metasenv ~body ?uri ()
+let currentProof () = new currentProof
+let instance = MatitaMisc.singleton currentProof
+