X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Ftactics%2FfwdSimplTactic.ml;h=57c9805139a6a3c4aaa8d9440fda0ba181fd4290;hb=12cc5b2b8e7f7bb0b5e315094b008a293a4df6b1;hp=e7d25daae63ecc24e4457a91b3188d49054105a9;hpb=ebaf3deffea9ac78a2b8b2a6c128cc24ad8459ef;p=helm.git

diff --git a/helm/ocaml/tactics/fwdSimplTactic.ml b/helm/ocaml/tactics/fwdSimplTactic.ml
index e7d25daae..57c980513 100644
--- a/helm/ocaml/tactics/fwdSimplTactic.ml
+++ b/helm/ocaml/tactics/fwdSimplTactic.ml
@@ -44,6 +44,16 @@ let error msg = raise (PET.Fail msg)
 
 (* unexported tactics *******************************************************)
 
+let id_tac = 
+   let id_tac (proof,goal) = 
+      try
+         let _, metasenv, _, _ = proof in
+         let _, _, _ = CicUtil.lookup_meta goal metasenv in
+         (proof,[goal])
+      with CicUtil.Meta_not_found _ -> (proof, [])
+   in 
+   PET.mk_tactic id_tac
+
 let clearbody ~index =
    let rec find_name index = function
       | Some (Cic.Name name, _) :: _ when index = 1 -> name
@@ -68,20 +78,21 @@ let strip_prods metasenv context ?how_many to_what term =
       metasenv, Cic.Meta (index, irl), index
    in
    let update_counters = function
-      | None, []                 -> None, T.id_tac, []
-      | None, to_what :: tail    -> None, PT.apply_tac ~term:to_what, tail
-      | Some hm, []              -> Some (pred hm), T.id_tac, []
-      | Some hm, to_what :: tail -> Some (pred hm), PT.apply_tac ~term:to_what, tail
+      | None, []                 -> None, false, id_tac, []
+      | None, to_what :: tail    -> None, true, PT.apply_tac ~term:to_what, tail
+      | Some hm, []              -> Some (pred hm), false, id_tac, []
+      | Some hm, to_what :: tail -> Some (pred hm), true, PT.apply_tac ~term:to_what, tail
    in 
    let rec aux metasenv metas conts tw = function
       | Some hm, _ when hm <= 0               -> metasenv, metas, conts 
       | xhm, Cic.Prod (Cic.Name _, t1, t2)    ->
          let metasenv, meta, index = mk_meta metasenv t1 in    
-	 aux metasenv (meta :: metas) ((T.id_tac, index) :: conts) tw (xhm, (S.subst meta t2))      
+	 aux metasenv (meta :: metas) (conts @ [id_tac, index]) tw (xhm, (S.subst meta t2))      
       | xhm, Cic.Prod (Cic.Anonymous, t1, t2) ->
-         let xhm, tac, tw = update_counters (xhm, tw) in 
+         let xhm, pos, tac, tw = update_counters (xhm, tw) in 
          let metasenv, meta, index = mk_meta metasenv t1 in    
-	 aux metasenv (meta :: metas) ((tac, index) :: conts) tw (xhm, (S.subst meta t2))
+	 let conts = if pos then (tac, index) :: conts else conts @ [tac, index] in 
+	 aux metasenv (meta :: metas) conts tw (xhm, (S.subst meta t2))
       | _, t                                  -> metasenv, metas, conts 
    in
    aux metasenv [] [] to_what (how_many, term)
@@ -110,8 +121,10 @@ let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~sub
 	 
 (* fwd **********************************************************************)
 
-let fwd_simpl_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) 
-                  ~hyp ~dbd =
+let fwd_simpl_tac
+     ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
+     ~dbd hyp
+  =
    let find_type metasenv context =
       let rec aux p = function
          | Some (Cic.Name name, Cic.Decl t) :: _ when name = hyp -> p, t
@@ -136,7 +149,7 @@ let fwd_simpl_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~
          | uri :: _ -> 
 	    Printf.eprintf "fwd: %s\n" (UriManager.string_of_uri uri); flush stderr;
 	    let start = lapply_tac (Cic.Rel index) (Cic.Const (uri, [])) in  
-            let tac = T.thens ~start ~continuations:[PESR.clearbody hyp] in
+            let tac = T.thens ~start ~continuations:[PESR.clear hyp] in
             PET.apply_tactic tac status
    in
    PET.mk_tactic fwd_simpl_tac