X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic%2FcicUtil.ml;h=ad01110c403f8b178ab91ddb7cdea3953d9b067e;hb=0c6a5aadb1a7746681a8e26fc0b009f847c10557;hp=55a70822ed6a95a9c04a95daebcfa3a4a105487c;hpb=a8f2c7ca6806a563808eba60fadd2e1dbaec49e4;p=helm.git

diff --git a/helm/ocaml/cic/cicUtil.ml b/helm/ocaml/cic/cicUtil.ml
index 55a70822e..ad01110c4 100644
--- a/helm/ocaml/cic/cicUtil.ml
+++ b/helm/ocaml/cic/cicUtil.ml
@@ -24,14 +24,42 @@
  *)
 
 exception Meta_not_found of int
+exception Subst_not_found of int
+
 
 let lookup_meta index metasenv =
   try
     List.find (fun (index', _, _) -> index = index') metasenv
   with Not_found -> raise (Meta_not_found index)
 
+let lookup_subst n subst =
+  try
+    List.assoc n subst
+  with Not_found -> raise (Subst_not_found n)
+
 let exists_meta index = List.exists (fun (index', _, _) -> (index = index'))
 
+(* clean_up_meta take a substitution, a metasenv a meta_inex and a local
+context l and clean up l with respect to the hidden hipothesis in the 
+canonical context *)
+
+let clean_up_local_context subst metasenv n l =
+  let cc =
+    (try
+       let (cc,_) = lookup_subst n subst in cc
+     with Subst_not_found _ ->
+       try
+	 let (_,cc,_) = lookup_meta n metasenv in cc
+       with Meta_not_found _ -> assert false) in
+  (try 
+     List.map2
+       (fun t1 t2 ->
+	  match t1,t2 with 
+	      None , _ -> None
+	    | _ , t -> t) cc l
+   with 
+       Invalid_argument _ -> assert false)
+
 let is_closed =
  let module C = Cic in
  let rec is_closed k =