X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicUtils.ml;h=a99ae0407f638b65e2932239b6bafac51f13bc2e;hb=5d0d8107649b9264ebe7d8ff2c69bf777179b0d2;hp=74d1a78344f3a9862000723b014cc19ff80750e6;hpb=9bd50f57560e6877c3829b788bab2c8c063678a4;p=helm.git

diff --git a/helm/software/components/ng_kernel/nCicUtils.ml b/helm/software/components/ng_kernel/nCicUtils.ml
index 74d1a7834..a99ae0407 100644
--- a/helm/software/components/ng_kernel/nCicUtils.ml
+++ b/helm/software/components/ng_kernel/nCicUtils.ml
@@ -17,6 +17,9 @@ module Ref = NReference
 exception Subst_not_found of int
 exception Meta_not_found of int
 
+let head_beta_reduce = ref (fun ~upto:_ _ -> assert false);;
+let set_head_beta_reduce = (:=) head_beta_reduce;;
+
 let expand_local_context = function
   | C.Irl len -> 
       let rec aux acc = function 
@@ -61,10 +64,18 @@ let map g k f = function
  | C.Rel _ as t -> t
  | C.Appl [] | C.Appl [_] -> assert false
  | C.Appl l as orig ->
-    (match HExtlib.sharing_map (f k) l with
+    let fire_beta, upto = 
+      match l with C.Meta _ :: _ -> true, List.length l - 1 | _ -> false, 0 
+    in
+    let l1 = HExtlib.sharing_map (f k) l in
+    if l == l1 then orig else
+    let t =
+      match l1 with
       | C.Appl l :: tl -> C.Appl (l@tl)
-      | l1 when l == l1 -> orig
-      | l1 -> C.Appl l1)
+      | l1 -> C.Appl l1
+    in
+      if fire_beta then !head_beta_reduce ~upto t
+      else t
  | C.Prod (n,s,t) as orig ->
      let s1 = f k s in let t1 = f (g (n,C.Decl s) k) t in
      if t1 == t && s1 == s then orig else C.Prod (n,s1,t1)
@@ -80,39 +91,3 @@ let map g k f = function
      if oty1 == oty && t1 == t && pl1 == pl then orig 
      else C.Match(r,oty1,t1,pl1)
 ;;
-
-let map_term_fold_a g k f a = function
- | C.Meta _ -> assert false
- | C.Implicit _
- | C.Sort _
- | C.Const _
- | C.Rel _ as t -> a,t
- | C.Appl [] | C.Appl [_] -> assert false
- | C.Appl l as orig ->
-    let a,l = 
-      (* sharing fold? *)
-      List.fold_right (fun t (a,l) -> let a,t = f k a t in a, t :: l) l (a,[])
-    in
-    a, (match l with
-       | C.Appl l :: tl -> C.Appl (l@tl)
-       | l1 when l == l1 -> orig
-       | l1 -> C.Appl l1)
- | C.Prod (n,s,t) as orig ->
-     let a,s1 = f k a s in let a,t1 = f (g (n,C.Decl s) k) a t in
-     a, if t1 == t && s1 == s then orig else C.Prod (n,s1,t1)
- | C.Lambda (n,s,t) as orig -> 
-     let a,s1 = f k a s in let a,t1 = f (g (n,C.Decl s) k) a t in
-     a, if t1 == t && s1 == s then orig else C.Lambda (n,s1,t1)
- | C.LetIn (n,ty,t,b) as orig -> 
-     let a,ty1 = f k a ty in let a,t1 = f k a t in
-     let a,b1 = f (g (n,C.Def (t,ty)) k) a b in
-     a, if ty1 == ty && t1 == t && b1 == b then orig else C.LetIn (n,ty1,t1,b1)
- | C.Match (r,oty,t,pl) as orig -> 
-     let a,oty1 = f k a oty in let a,t1 = f k a t in 
-     let a,pl1 = 
-       (* sharing fold? *)
-       List.fold_right (fun t (a,l) -> let a,t = f k a t in a,t::l) pl (a,[])
-     in
-     a, if oty1 == oty && t1 == t && pl1 == pl then orig 
-        else C.Match(r,oty1,t1,pl1)
-;;