renamed Http_client to Http_user_agent to avoid clashes with Gerd's

[helm.git] / helm / ocaml / tactics / proofEngineTypes.ml

diff --git a/helm/ocaml/tactics/proofEngineTypes.ml b/helm/ocaml/tactics/proofEngineTypes.ml
index 3e0a12e4e406a0e689bead48c5da8be38e0b9a54..b4992aca3496420c9f1277a50b9065aed36985c5 100644 (file)
--- a/helm/ocaml/tactics/proofEngineTypes.ml
+++ b/helm/ocaml/tactics/proofEngineTypes.ml
@@ -31,6 +31,21 @@ type proof = UriManager.uri option * Cic.metasenv * Cic.term * Cic.term
 type goal = int
 type status = proof * goal
 
+let initial_status ty metasenv =
+  let rec aux max = function
+    | [] -> max + 1
+    | (idx, _, _) :: tl ->
+        if idx > max then
+          aux idx tl
+        else
+          aux max tl
+  in
+  let newmeta_idx = aux 0 metasenv in
+  let proof =
+    None, (newmeta_idx, [], ty) :: metasenv, Cic.Meta (newmeta_idx, []), ty
+  in
+  (proof, newmeta_idx)
+
   (**
     a tactic: make a transition from one status to another one or, usually,
     raise a "Fail" (@see Fail) exception in case of failure
@@ -38,9 +53,24 @@ 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