X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_refiner%2FnCicMetaSubst.ml;h=26dc85cacebadc948661b90ae084159a7499ba78;hb=c22f39a5d5afc0ef55beb221e00e2e6703b13d90;hp=5062353cd1662876da66f1135265deffc0cbe910;hpb=d7f32114f3806b51c2ee483dcb5a86e08d086a72;p=helm.git

diff --git a/helm/software/components/ng_refiner/nCicMetaSubst.ml b/helm/software/components/ng_refiner/nCicMetaSubst.ml
index 5062353cd..26dc85cac 100644
--- a/helm/software/components/ng_refiner/nCicMetaSubst.ml
+++ b/helm/software/components/ng_refiner/nCicMetaSubst.ml
@@ -14,24 +14,27 @@
 exception MetaSubstFailure of string Lazy.t
 exception Uncertain of string Lazy.t
 
-let newmeta = 
+let newmeta,maxmeta = 
   let maxmeta = ref 0 in
-  fun () -> incr maxmeta; !maxmeta
+  (fun () -> incr maxmeta; !maxmeta),
+  (fun () -> !maxmeta)
 ;;
 
 exception NotInTheList;;
 
-let position n (shift, lc) =
+let position to_skip n (shift, lc) =
   match lc with
+  | NCic.Irl _ when to_skip > 0 -> assert false  (* unclear to me *)
   | NCic.Irl len when n <= shift || n > shift + len -> raise NotInTheList
   | NCic.Irl _ -> n - shift
   | NCic.Ctx tl ->
-      let rec aux k = function 
+      let rec aux to_skip k = function 
          | [] -> raise NotInTheList
+         | _ :: tl when to_skip > 0 -> aux (to_skip - 1) (k+1) tl
          | (NCic.Rel m)::_ when m + shift = n -> k
-         | _::tl -> aux (k+1) tl 
+         | _::tl -> aux to_skip (k+1) tl 
       in
-       aux 1 tl
+       aux to_skip 1 tl
 ;;
 
 let pack_lc orig = 
@@ -193,40 +196,96 @@ and restrict metasenv subst i restrictions =
     | NCicUtils.Meta_not_found _ -> assert false
 ;;
 
+let rec flexible_arg subst = function 
+  | NCic.Meta (i,_) | NCic.Appl (NCic.Meta (i,_) :: _)-> 
+      (try 
+        let _,_,t,_ = List.assoc i subst in
+        flexible_arg subst t
+      with Not_found -> true)
+  | _ -> false
+;;
+
+let flexible subst l = List.exists (flexible_arg subst) l;;
+
+let in_scope_tag  = "tag:in_scope" ;;
+let out_scope_tag_prefix = "tag:out_scope:" 
+let out_scope_tag n = out_scope_tag_prefix ^ string_of_int n ;;
+let is_out_scope_tag tag =
+   String.length tag > String.length out_scope_tag_prefix &&
+   String.sub tag 0 (String.length out_scope_tag_prefix) = out_scope_tag_prefix 
+;;
+let int_of_out_scope_tag tag = 
+  int_of_string
+   (String.sub tag (String.length out_scope_tag_prefix)
+     (String.length tag - (String.length out_scope_tag_prefix)))
+;;
+
+
+exception Found;;
+
 (* INVARIANT: we suppose that t is not another occurrence of Meta(n,_), 
    otherwise the occur check does not make sense in case of unification
    of ?n with ?n *)
 let delift ~unify metasenv subst context n l t =
-  let unify_list = 
+  let is_in_scope_meta subst = function
+    | NCic.Meta (i,_) ->
+        (try 
+           let tag, _, _, _ = NCicUtils.lookup_subst i subst in 
+           tag = Some in_scope_tag 
+        with NCicUtils.Subst_not_found _ -> false)
+    | _ -> false
+  in
+  let contains_in_scope subst t = 
+    let rec aux _ () = function
+      | NCic.Meta _ as t ->
+          if is_in_scope_meta subst t then raise Found
+          else ()
+      | t -> 
+          if is_in_scope_meta subst t then raise Found
+          else NCicUtils.fold (fun _ () -> ()) () aux () t
+    in
+    try aux () () t; false with Found -> true
+  in
+  let unify_list ~alpha in_scope = 
     match l with
     | _, NCic.Irl _ -> fun _ _ _ _ _ -> None
     | shift, NCic.Ctx l -> fun metasenv subst context k t ->
-       HExtlib.list_findopt
-        (fun li i ->
-          let li = NCicSubstitution.lift (k+shift) li in
-          match unify metasenv subst context li t with
-          | Some (metasenv,subst) -> 
-              Some ((metasenv, subst), NCic.Rel (i+1+k))
-          | None -> None)
-        l
+       if flexible_arg subst t || contains_in_scope subst t then None else
+         let lb = List.map (fun t -> t, flexible_arg subst t) l in
+         HExtlib.list_findopt
+          (fun (li,flexible) i ->
+            if flexible || i < in_scope then None else
+             let li = NCicSubstitution.lift (k+shift) li in
+              if alpha then
+               if NCicReduction.alpha_eq metasenv subst context li t then
+                Some ((metasenv,subst), NCic.Rel (i+1+k))
+               else
+                None
+              else
+               match unify metasenv subst context li t with
+               | Some (metasenv,subst) -> 
+                   Some ((metasenv, subst), NCic.Rel (i+1+k))
+               | None -> None)
+          lb
   in
-  let rec aux k (metasenv, subst as ms) t = 
-   match unify_list metasenv subst context k t with
+  let rec aux (context,k,in_scope) (metasenv, subst as ms) t = 
+   match unify_list ~alpha:true in_scope metasenv subst context k t with
    | Some x -> x
    | None -> 
+   try
     match t with 
     | NCic.Rel n as t when n <= k -> ms, t
     | NCic.Rel n -> 
         (try
           match List.nth context (n-k-1) with
           | _,NCic.Def (bo,_) -> 
-                (try ms, NCic.Rel ((position (n-k) l) + k)
+                (try ms, NCic.Rel ((position in_scope (n-k) l) + k)
                  with NotInTheList ->
                 (* CSC: This bit of reduction hurts performances since it is
                  * possible to  have an exponential explosion of the size of the
                  * proof. required for nat/nth_prime.ma *)
-                  aux k ms (NCicSubstitution.lift n bo))
-          | _,NCic.Decl _ -> ms, NCic.Rel ((position (n-k) l) + k)
+                  aux (context,k,in_scope) ms (NCicSubstitution.lift n bo))
+          | _,NCic.Decl _ -> ms, NCic.Rel ((position in_scope (n-k) l) + k)
         with Failure _ -> assert false) (*Unbound variable found in delift*)
     | NCic.Meta (i,_) when i=n ->
          raise (MetaSubstFailure (lazy (Printf.sprintf (
@@ -236,9 +295,20 @@ let delift ~unify metasenv subst context n l t =
             (NCicPp.ppterm ~context ~metasenv ~subst t))))
     | NCic.Meta (i,l1) as orig ->
         (try
-           let tag,_,t,_ = NCicUtils.lookup_subst i subst in
-           (match tag with None -> () | Some tag -> prerr_endline tag);
-           aux k ms (NCicSubstitution.subst_meta l1 t)
+           let tag,c,t,ty = NCicUtils.lookup_subst i subst in
+           let in_scope, clear = 
+             match tag with 
+             | Some tag when tag = in_scope_tag -> 0, true
+             | Some tag when is_out_scope_tag tag->int_of_out_scope_tag tag,true
+             | _ -> in_scope, false
+           in
+           let ms = 
+             if not clear then ms
+             else 
+               metasenv, 
+               (i,(None,c,t,ty)) :: List.filter (fun j,_ -> i <> j) subst
+           in
+           aux (context,k,in_scope) ms (NCicSubstitution.subst_meta l1 t)
          with NCicUtils.Subst_not_found _ ->
            if snd l1 = NCic.Irl 0 || snd l1 = NCic.Ctx [] then ms, orig
            else
@@ -307,7 +377,7 @@ let delift ~unify metasenv subst context n l t =
                     | t::tl ->
                         let ms, tbr, tl = deliftl tbr (j+1) ms tl in
                         try 
-                          let ms, t = aux k ms t in 
+                          let ms, t = aux (context,k,in_scope) ms t in 
                           ms, tbr, t::tl
                         with
                         | NotInTheList | MetaSubstFailure _ -> ms, j::tbr, tl
@@ -330,9 +400,15 @@ let delift ~unify metasenv subst context n l t =
                       restrict metasenv subst i to_be_r in
                     (metasenv, subst), NCic.Meta(newmeta,l1))
 
-    | t -> NCicUntrusted.map_term_fold_a (fun _ k -> k+1) k aux ms t
+    | t -> 
+        NCicUntrusted.map_term_fold_a 
+          (fun e (c,k,s) -> (e::c,k+1,s)) (context,k,in_scope) aux ms t
+   with NotInTheList ->
+    match unify_list ~alpha:false in_scope metasenv subst context k t with
+    | Some x -> x
+    | None -> raise NotInTheList
   in
-   try aux 0 (metasenv,subst) t
+   try aux (context,0,0) (metasenv,subst) t
    with NotInTheList ->
       (* This is the case where we fail even first order unification. *)
       (* The reason is that our delift function is weaker than first  *)
@@ -349,10 +425,7 @@ let delift ~unify metasenv subst context n l t =
       let lc = NCicUtils.expand_local_context lc in
       let l = List.map (NCicSubstitution.lift shift) lc in
        if
-         List.exists
-          (fun t -> 
-                  NCicUntrusted.metas_of_term subst context t = [])
-            l
+        List.exists (fun t-> NCicUntrusted.metas_of_term subst context t = []) l
        then
         raise (Uncertain msg)
        else