X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Ftactics%2FequalityTactics.ml;h=f284a2d1d145dbdb6d2c49c6885098ae19904e9c;hb=12fe61bed1275c4c596501fb951a9197f50c93e8;hp=f2760c30f33f394daded905bc246cc63446e7321;hpb=ea651f11cbc6edb17e8d0d16c239e0cf3f526959;p=helm.git

diff --git a/helm/software/components/tactics/equalityTactics.ml b/helm/software/components/tactics/equalityTactics.ml
index f2760c30f..f284a2d1d 100644
--- a/helm/software/components/tactics/equalityTactics.ml
+++ b/helm/software/components/tactics/equalityTactics.ml
@@ -75,7 +75,7 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
           [] -> assert false
         | Some (Cic.Name s,Cic.Decl ty)::_ when name = s ->
            Cic.Rel n, S.lift n ty
-        | Some (Cic.Name s,Cic.Def _)::_ -> assert false (*CSC: not implemented yet! But does this make any sense?*)
+        | Some (Cic.Name s,Cic.Def _)::_ when name = s -> assert false (*CSC: not implemented yet! But does this make any sense?*)
         | _::tl -> find_hyp (n+1) tl
       in
        let arg,gty = find_hyp 1 context in
@@ -149,7 +149,9 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
       match concl_pat with
       | None -> None
       | Some term -> Some (S.lift 1 term) in
-    Some (fun _ m u -> lifted_t1, m, u),[],lifted_concl_pat
+    Some (fun c m u -> 
+       let distance  = pred (List.length c - List.length context) in
+       S.lift distance lifted_t1, m, u),[],lifted_concl_pat
   in
   let subst,metasenv',ugraph,_,selected_terms_with_context =
    ProofEngineHelpers.select
@@ -376,83 +378,3 @@ let transitivity_tac ~term =
   ProofEngineTypes.mk_tactic (transitivity_tac ~term)
 ;;
 
-(* FG: subst tactic *********************************************************)
-
-(* FG: This should be replaced by T.try_tactic *)
-let try_tactic ~tactic =
-   let try_tactic status =
-      try PET.apply_tactic tactic status with
-         | PET.Fail _ -> PET.apply_tactic T.id_tac status
-   in
-   PET.mk_tactic try_tactic
-
-let rec lift_rewrite_tac ~context ~direction ~pattern equality =
-   let lift_rewrite_tac status =
-      let (proof, goal) = status in
-      let (_, metasenv, _, _, _) = proof in
-      let _, new_context, _ = CicUtil.lookup_meta goal metasenv in
-      let n = List.length new_context - List.length context in
-      let equality = if n > 0 then S.lift n equality else equality in
-      PET.apply_tactic (rewrite_tac ~direction ~pattern equality []) status
-   in
-   PET.mk_tactic lift_rewrite_tac
-
-
-let msg0 = lazy "Subst: not found in context"
-let msg1 = lazy "Subst: not a simple equality"
-let msg2 = lazy "Subst: recursive equation" 
-
-let subst_tac ~hyp =
-   let hole = C.Implicit (Some `Hole) in
-   let subst_tac status =
-      let (proof, goal) = status in
-      let (_, metasenv, _, _, _) = proof in
-      let _, context, _ = CicUtil.lookup_meta goal metasenv in
-      let what = match PEH.get_rel context hyp with
-         | Some t -> t
-	 | None   -> raise (PET.Fail msg0)
-      in
-      let ty, _ = TC.type_of_aux' metasenv context what CicUniv.empty_ugraph in
-      let direction, i, t = match ty with
-         | (C.Appl [(C.MutInd (uri, 0, [])); _; C.Rel i; t]) 
-	    when LO.is_eq_URI uri -> `LeftToRight, i, t
-         | (C.Appl [(C.MutInd (uri, 0, [])); _; t; C.Rel i]) 
-	    when LO.is_eq_URI uri -> `RightToLeft, i, t
-	 | _ -> raise (PET.Fail msg1)
-      in    
-      let rewrite pattern =
-         let tactic = lift_rewrite_tac ~context ~direction ~pattern what in
-	 try_tactic ~tactic
-      in
-      let var = match PEH.get_name context i with
-         | Some name -> name
-	 | None      -> raise (PET.Fail msg0)	
-      in
-      if DTI.does_not_occur i t then () else raise (PET.Fail msg2);
-      let map self = function
-         | Some (C.Name s, _) when s <> self -> 
-            Some (rewrite (None, [(s, hole)], None))
-         | _                                 -> None
-      in
-      let rew_hips = HEL.list_rev_map_filter (map hyp) context in
-      let rew_concl = rewrite (None, [], Some hole) in
-      let clear = PESR.clear ~hyps:[hyp; var] in
-      let tactics = List.rev_append (rew_concl :: rew_hips) [clear] in
-      PET.apply_tactic (T.seq ~tactics) status
-   in
-   PET.mk_tactic subst_tac
-
-let subst_tac =
-   let subst hyp = try_tactic ~tactic:(subst_tac hyp) in
-   let map = function
-      | Some (C.Name s, _) -> Some (subst s)
-      | _                  -> None
-   in
-   let subst_tac status =
-      let (proof, goal) = status in
-      let (_, metasenv, _, _, _) = proof in
-      let _, context, _ = CicUtil.lookup_meta goal metasenv in
-      let tactics = HEL.list_rev_map_filter map context in
-      PET.apply_tactic (T.seq ~tactics) status
-   in
-   PET.mk_tactic subst_tac