X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Ftactics%2Funiverse.ml;h=780b72daf8e421402e4752a070867ea00044a6db;hb=82d4772ee9ac860f0a99b774612d2cf19838bb4b;hp=f7c3932dc688abf1e5ca3c4acb0308d59b1d4a66;hpb=2e2648a9ed26d9b813de8e6a10e2776162565f09;p=helm.git

diff --git a/helm/software/components/tactics/universe.ml b/helm/software/components/tactics/universe.ml
index f7c3932dc..780b72daf 100644
--- a/helm/software/components/tactics/universe.ml
+++ b/helm/software/components/tactics/universe.ml
@@ -28,16 +28,35 @@ module Codomain = struct
   let compare = Pervasives.compare 
 end
 module S = Set.Make(Codomain)
-module TI = Discrimination_tree.DiscriminationTreeIndexing(S)
+module TI = Discrimination_tree.Make(Discrimination_tree.CicIndexable)(S)
 type universe = TI.t
 
-let empty = TI.empty
+let empty = TI.empty ;;
+
+let iter u f = 
+  TI.iter u 
+   (fun p s -> f p (S.elements s))
 ;;
 
 let get_candidates univ ty = 
   S.elements (TI.retrieve_unifiables univ ty)
 ;;
 
+let in_universe univ ty =
+  let candidates = get_candidates univ ty in
+    List.fold_left 
+      (fun res cand ->
+	 match res with
+	   | Some found -> Some found
+	   | None -> 
+	       let candty,_ = 
+		 CicTypeChecker.type_of_aux' [] [] cand CicUniv.oblivion_ugraph in
+	       let same ,_ = 
+		 CicReduction.are_convertible [] candty ty CicUniv.oblivion_ugraph in
+	       if same then Some cand else None
+      ) None candidates
+;;
+
 let rec unfold context = function
   | Cic.Prod(name,s,t) -> 
       let t' = unfold ((Some (name,Cic.Decl s))::context) t in
@@ -73,7 +92,7 @@ let rec collapse_head_metas t =
 
 let rec dummies_of_coercions = 
   function
-    | Cic.Appl (c::l) when CoercDb.is_a_coercion' c ->
+    | Cic.Appl (c::l) when CoercDb.is_a_coercion c <> None ->
         Cic.Meta (-1,[])
     | Cic.Appl l -> 
         let l' = List.map dummies_of_coercions l in Cic.Appl l'