Procedural: clear tactics added

[helm.git] / helm / software / components / tactics / equalityTactics.ml

diff --git a/helm/software/components/tactics/equalityTactics.ml b/helm/software/components/tactics/equalityTactics.ml
index 839d0532a401d44a9e159ae11cacc97a8651948e..f284a2d1d145dbdb6d2c49c6885098ae19904e9c 100644 (file)
--- a/helm/software/components/tactics/equalityTactics.ml
+++ b/helm/software/components/tactics/equalityTactics.ml
@@ -46,6 +46,8 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
   let proof,goal = status in
   let curi, metasenv, pbo, pty, attrs = proof in
   let (metano,context,gty) = CicUtil.lookup_meta goal metasenv in
+  let gsort,_ =
+   CicTypeChecker.type_of_aux' metasenv context gty CicUniv.oblivion_ugraph in
   match hyps_pat with
      he::(_::_ as tl) ->
        PET.apply_tactic
@@ -73,7 +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
@@ -117,8 +119,16 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
     | C.Appl [C.MutInd (uri, 0, []); ty; t1; t2]
       when LibraryObjects.is_eq_URI uri ->
         let ind_uri =
-         if_right_to_left dir2
-          LibraryObjects.eq_ind_URI LibraryObjects.eq_ind_r_URI
+         match gsort with
+            C.Sort C.Prop ->
+             if_right_to_left dir2
+              LibraryObjects.eq_ind_URI LibraryObjects.eq_ind_r_URI
+          | C.Sort C.Set ->
+             if_right_to_left dir2
+              LibraryObjects.eq_rec_URI LibraryObjects.eq_rec_r_URI
+          | _ ->
+             if_right_to_left dir2
+              LibraryObjects.eq_rect_URI LibraryObjects.eq_rect_r_URI
         in
         let eq_ind = C.Const (ind_uri uri,[]) in
          if dir2 then
@@ -139,7 +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
@@ -366,83 +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