X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Ftactics%2FproofEngineTypes.ml;h=ac0713bd057dc364c44a193f71cb1b475a14e564;hb=0c6a5aadb1a7746681a8e26fc0b009f847c10557;hp=d668090e49e2c0f1fd2be733b3ebcbe7b491a55b;hpb=a6fc115fd7d4cfba94a43f001f4c27322d3db1a8;p=helm.git

diff --git a/helm/ocaml/tactics/proofEngineTypes.ml b/helm/ocaml/tactics/proofEngineTypes.ml
index d668090e4..ac0713bd0 100644
--- a/helm/ocaml/tactics/proofEngineTypes.ml
+++ b/helm/ocaml/tactics/proofEngineTypes.ml
@@ -26,7 +26,7 @@
   (**
     current proof (proof uri * metas * (in)complete proof * term to be prooved)
   *)
-type proof = UriManager.uri * Cic.metasenv * Cic.term * Cic.term
+type proof = UriManager.uri option * Cic.metasenv * Cic.term * Cic.term
   (** current goal, integer index *)
 type goal = int
 type status = proof * goal
@@ -38,9 +38,22 @@ type status = proof * goal
   (** an unfinished proof with the optional current goal *)
 type tactic = status -> proof * goal list
 
+  (** creates an opaque tactic from a status->proof*goal list function *)
+let mk_tactic t = t
+
   (** tactic failure *)
 exception Fail of string
 
+  (** 
+    calls the opaque tactic on the status, restoring the original 
+    universe graph if the tactic Fails
+  *)
+let apply_tactic t status = 
+  let saved_univ = CicUniv.get_working() in
+  try 
+    t status
+  with Fail s -> CicUniv.set_working saved_univ; raise (Fail s)
+
   (** constraint: the returned value will always be constructed by Cic.Name **)
 type mk_fresh_name_type =
  Cic.metasenv -> Cic.context -> Cic.name -> typ:Cic.term -> Cic.name