new dependences

[helm.git] / helm / software / components / ng_kernel / nCicSubstitution.ml

diff --git a/helm/software/components/ng_kernel/nCicSubstitution.ml b/helm/software/components/ng_kernel/nCicSubstitution.ml
index 1e3856fff80447c48e20015518e013f153f422d1..32fa33ac845b5a272bf233f3644082d61a33245a 100644 (file)
--- a/helm/software/components/ng_kernel/nCicSubstitution.ml
+++ b/helm/software/components/ng_kernel/nCicSubstitution.ml
@@ -11,6 +11,12 @@
 
 (* $Id$ *)
 
+let ppterm = 
+  ref (fun ~context:_ ~subst:_ ~metasenv:_ ?inside_fix _ -> 
+       let _ = inside_fix in assert false)
+;;
+let set_ppterm f = ppterm := f;;
+
 module C = NCic 
 module Ref = NReference
 
@@ -19,8 +25,7 @@ let debug_print = fun _ -> ();;
 let lift_from k n =
  let rec liftaux k = function
     | C.Rel m as t -> if m < k then t else C.Rel (m + n)
-    | C.Meta (i,(m,l)) as t when k <= m ->
-       if n = 0 then t else C.Meta (i,(m+n,l))
+    | C.Meta (i,(m,l)) when k <= m+1 -> C.Meta (i,(m+n,l))
     | C.Meta (_,(m,C.Irl l)) as t when k > l + m -> t
     | C.Meta (i,(m,l)) -> 
        let lctx = NCicUtils.expand_local_context l in
@@ -36,6 +41,7 @@ let lift ?(from=1) n t =
   else lift_from from n t
 ;;
 
+
 (* subst t1 t2                                                          *)
 (*  substitutes [t1] for [Rel 1] in [t2]                                *)
 (*  if avoid_beta_redexes is true (default: false) no new beta redexes  *)
@@ -53,16 +59,14 @@ let rec psubst ?(avoid_beta_redexes=false) map_arg args =
       | n when n < k -> t
       | n (* k <= n < k+nargs *) ->
        (try lift (k-1) (map_arg (List.nth args (n-k)))
-        with Failure _ -> assert false))
+        with Failure _ | Invalid_argument _ -> assert false))
    | C.Meta (i,(m,l)) as t when m >= k + nargs - 1 -> 
        if nargs <> 0 then C.Meta (i,(m-nargs,l)) else t
-   | C.Meta (i,(m,(C.Irl l as irl))) as t when k > l + m -> 
-       if nargs <> 0 then C.Meta (i,(m-nargs,irl)) else t
+   | C.Meta (_,(m,(C.Irl l))) as t when k > l + m -> t
    | C.Meta (i,(m,l)) -> 
       let lctx = NCicUtils.expand_local_context l in
-      (* 1-nargs < k-m, when <= 0 is still reasonable because we will
-       * substitute args[ k-m ... k-m+nargs-1 > 0 ] *)
-      C.Meta (i,(m, C.Ctx (HExtlib.sharing_map (substaux (k-m)) lctx)))
+       C.Meta (i,(0, 
+         C.Ctx (HExtlib.sharing_map (fun x -> substaux k (lift m x)) lctx)))
    | C.Implicit _ -> assert false (* was identity *)
    | C.Appl (he::tl) as t ->
       (* Invariant: no Appl applied to another Appl *)