+let history = ref [];;
+let frozen_list = ref [];;
+
+let get_obj = ref (fun _ -> assert false);;
+let set_get_obj f = get_obj := f;;
+
+let type0 = []
+
+let max l1 l2 =
+ HExtlib.list_uniq ~eq:(fun (b1,u1) (b2,u2) -> b1=b2 && NUri.eq u1 u2)
+ (List.sort (fun (b1,u1) (b2,u2) ->
+ let res = compare b1 b2 in if res = 0 then NUri.compare u1 u2 else res)
+ (l1 @ l2))
+
+let le_constraints = ref [] (* strict,a,b *)
+
+let rec le_path_uri avoid strict a b =
+ (not strict && NUri.eq a b) ||
+ List.exists
+ (fun (strict',x,y) ->
+ NUri.eq y b && not (List.exists (NUri.eq x) avoid) &&
+ le_path_uri (x::avoid) (strict && not strict') a x
+ ) !le_constraints
+;;
+
+let leq_path a b = le_path_uri [b] (fst a) (snd a) b;;
+
+let universe_leq a b =
+ match a, b with
+ | a,[(false,b)] -> List.for_all (fun a -> leq_path a b) a
+ | _,_ ->
+ raise (BadConstraint
+ (lazy "trying to check if a universe is less or equal than an inferred universe"))
+
+let universe_eq a b =
+ match a,b with
+ | [(false,_)], [(false,_)] -> universe_leq b a && universe_leq a b
+ | _, [(false,_)]
+ | [(false,_)],_ -> false
+ | _ ->
+ raise (BadConstraint
+ (lazy "trying to check if two inferred universes are equal"))
+;;
+
+let pp_constraint b x y =
+ NUri.name_of_uri x ^ (if b then " < " else " <= ") ^ NUri.name_of_uri y
+;;
+
+let pp_constraints () =
+ String.concat "\n" (List.map (fun (b,x,y) -> pp_constraint b x y) !le_constraints)
+;;
+
+let universes = ref [];;
+
+let add_constraint strict a b =
+ match a,b with
+ | [false,a2],[false,b2] ->
+ if not (le_path_uri [] strict a2 b2) then (
+ if le_path_uri [] (not strict) b2 a2 then
+ (raise(BadConstraint(lazy("universe inconsistency adding "^pp_constraint strict a2 b2
+ ^ " to:\n" ^ pp_constraints ()))));
+ universes := a2 :: b2 ::
+ List.filter (fun x -> not (NUri.eq x a2 || NUri.eq x b2)) !universes;
+ le_constraints := (strict,a2,b2) :: !le_constraints);
+ history := (`Constr (strict,a,b))::!history;
+ | _ -> raise (BadConstraint
+ (lazy "trying to add a constraint on an inferred universe"))
+;;
+
+let sup l =
+ match l with
+ | [false,_] -> Some l
+ | l ->
+ let bigger_than acc (s1,n1) = List.filter (le_path_uri [] s1 n1) acc in
+ let solutions = List.fold_left bigger_than !universes l in
+ let rec aux = function
+ | [] -> None
+ | u :: tl ->
+ if List.exists (fun x -> le_path_uri [] true x u) solutions then aux tl
+ else Some [false,u]
+ in
+ aux solutions
+;;
+
+
+
+let typecheck_obj,already_set = ref (fun _ -> assert false), ref false;;
+let set_typecheck_obj f =
+ if !already_set then
+ assert false
+ else
+ begin
+ typecheck_obj := f;
+ already_set := true
+ end
+;;
+
+let invalidate_item item =
+ let item_eq a b =
+ match a, b with
+ | `Obj (u1,_), `Obj (u2,_) -> NUri.eq u1 u2
+ | `Constr _, `Constr _ -> a=b (* MAKE EFFICIENT *)
+ | _ -> false
+ in
+ let rec aux to_be_deleted =
+ function
+ [] -> assert false
+ | item'::tl when item_eq item item' -> item'::to_be_deleted,tl
+ | item'::tl -> aux (item'::to_be_deleted) tl
+ in
+ let to_be_deleted,h = aux [] !history in
+ history := h;
+ List.iter
+ (function
+ | `Obj (uri,_) -> NUri.UriHash.remove cache uri
+ | `Constr (strict,[_,u1],[_,u2]) as c ->
+ let w = strict,u1,u2 in
+ if not(List.mem c !history) then
+ le_constraints := List.filter ((<>) w) !le_constraints;
+ | `Constr _ -> assert false
+ ) to_be_deleted
+;;
+
+exception Propagate of NUri.uri * exn;;
+
+let to_exn f x =
+ match f x with
+ `WellTyped o -> o
+ | `Exn e -> raise e
+;;
+
+let check_and_add_obj ((u,_,_,_,_) as obj) =
+ let saved_frozen_list = !frozen_list in
+ try
+ frozen_list := (u,obj)::saved_frozen_list;
+ !typecheck_obj obj;
+ frozen_list := saved_frozen_list;
+ let obj' = `WellTyped obj in
+ NUri.UriHash.add cache u obj';
+ history := (`Obj (u,obj))::!history;
+ obj'
+ with
+ Sys.Break as e ->
+ frozen_list := saved_frozen_list;
+ raise e
+ | Propagate (u',old_exn) as e' ->
+ frozen_list := saved_frozen_list;
+ let exn = `Exn (BadDependency (lazy (NUri.string_of_uri u ^
+ " depends (recursively) on " ^ NUri.string_of_uri u' ^
+ " which is not well-typed"),
+ match old_exn with BadDependency (_,e) -> e | _ -> old_exn)) in
+ NUri.UriHash.add cache u exn;
+ history := (`Obj (u,obj))::!history;
+ if saved_frozen_list = [] then
+ exn
+ else
+ raise e'
+ | e ->
+ frozen_list := saved_frozen_list;
+ let exn = `Exn e in
+ NUri.UriHash.add cache u exn;
+ history := (`Obj (u,obj))::!history;
+ if saved_frozen_list = [] then
+ exn
+ else
+ raise (Propagate (u,e))
+;;