X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicEnvironment.ml;h=f31c4e9b1ebbc71416ced0dbbc120e4bf60c7448;hb=be88425efab1997c964137854e2f76aac6ebf877;hp=496ae54468471382ede458fc51fdd4c1bc0f96c4;hpb=4d765cc85e3a1e84c80c348a1e67ea1eed984916;p=helm.git

diff --git a/helm/software/components/ng_kernel/nCicEnvironment.ml b/helm/software/components/ng_kernel/nCicEnvironment.ml
index 496ae5446..f31c4e9b1 100644
--- a/helm/software/components/ng_kernel/nCicEnvironment.ml
+++ b/helm/software/components/ng_kernel/nCicEnvironment.ml
@@ -16,11 +16,17 @@ module Ref = NReference
 
 exception CircularDependency of string Lazy.t;;
 exception ObjectNotFound of string Lazy.t;;
-exception BadDependency of string Lazy.t;;
+exception BadDependency of string Lazy.t * exn;;
 exception BadConstraint of string Lazy.t;;
 
 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 =
@@ -41,7 +47,15 @@ let universe_leq a b =
      raise (BadConstraint
       (lazy "trying to check if a universe is less or equal than an inferred universe"))
 
-let universe_eq a b = universe_leq b a && universe_leq a b
+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
@@ -51,6 +65,8 @@ 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] -> 
@@ -58,11 +74,30 @@ let add_constraint strict a b =
         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)
   | _ -> 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
@@ -105,11 +140,12 @@ let get_checked_obj u =
         Sys.Break as e ->
          frozen_list := saved_frozen_list;
          raise e
-      | Propagate (u',_) as 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"))) in
+           " which is not well-typed"), 
+           match old_exn with BadDependency (_,e) -> e | _ -> old_exn)) in
          NUri.UriHash.add cache u exn;
          if saved_frozen_list = [] then
           exn