X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicUtils.ml;h=f4f77a3679783c3663931f13c6d3832c000463ec;hb=b637879a2b3f2ceda65afb3c950061189c4730b7;hp=5b5045a662b1087574fd0e2f9fdf603167670849;hpb=d66222777ea069f6cde311548dc327f5be09ec59;p=helm.git

diff --git a/helm/software/components/ng_kernel/nCicUtils.ml b/helm/software/components/ng_kernel/nCicUtils.ml
index 5b5045a66..f4f77a367 100644
--- a/helm/software/components/ng_kernel/nCicUtils.ml
+++ b/helm/software/components/ng_kernel/nCicUtils.ml
@@ -9,19 +9,22 @@
      \ /   This software is distributed as is, NO WARRANTY.     
       V_______________________________________________________________ *)
 
-(* $Id: nCicSubstitution.ml 8135 2008-02-13 15:35:43Z tassi $ *)
+(* $Id$ *)
+
+module C = NCic
+module Ref = NReference
 
 exception Subst_not_found of int
 exception Meta_not_found of int
 
 let expand_local_context = function
-  | NCic.Irl len -> 
+  | C.Irl len -> 
       let rec aux acc = function 
         | 0 -> acc
-        | n -> aux (NCic.Rel n::acc) (n-1)
+        | n -> aux (C.Rel n::acc) (n-1)
       in
        aux [] len
-  | NCic.Ctx lctx -> lctx
+  | C.Ctx lctx -> lctx
 ;;
 
 let lookup_subst n subst =
@@ -37,55 +40,43 @@ let lookup_meta n metasenv =
 ;;
 
 let fold g k f acc = function
- | NCic.Meta _ -> assert false
- | NCic.Implicit _
- | NCic.Sort _
- | NCic.Const _
- | NCic.Rel _ -> acc
- | NCic.Appl [] | NCic.Appl [_] -> assert false
- | NCic.Appl l -> List.fold_left (f k) acc l
- | NCic.Prod (n,s,t)
- | NCic.Lambda (n,s,t) -> f (g (n,NCic.Decl s) k) (f k acc s) t
- | NCic.LetIn (n,ty,t,bo) -> f (g (n,NCic.Def (t,ty)) k) (f k (f k acc ty) t) bo
- | NCic.Match (_,oty,t,pl) -> List.fold_left (f k) (f k (f k acc oty) t) pl
+ | C.Meta _ -> assert false
+ | C.Implicit _
+ | C.Sort _
+ | C.Const _
+ | C.Rel _ -> acc
+ | C.Appl [] | C.Appl [_] -> assert false
+ | C.Appl l -> List.fold_left (f k) acc l
+ | C.Prod (n,s,t)
+ | C.Lambda (n,s,t) -> f (g (n,C.Decl s) k) (f k acc s) t
+ | C.LetIn (n,ty,t,bo) -> f (g (n,C.Def (t,ty)) k) (f k (f k acc ty) t) bo
+ | C.Match (_,oty,t,pl) -> List.fold_left (f k) (f k (f k acc oty) t) pl
 ;;
 
-let sharing_map f l =
-  let unchanged = ref true in
-  let rec aux b = function
-    | [] as t -> unchanged := b; t
-    | he::tl ->
-        let he1 = f he in
-        he1 :: aux (b && he1 == he) tl
-  in
-  let l1 = aux true l in
-  if !unchanged then l else l1
-;;
-        
 let map g k f = function
- | NCic.Meta _ -> assert false
- | NCic.Implicit _
- | NCic.Sort _
- | NCic.Const _
- | NCic.Rel _ as t -> t
- | NCic.Appl [] | NCic.Appl [_] -> assert false
- | NCic.Appl l as orig ->
-    (match sharing_map (f k) l with
-      | NCic.Appl l :: tl -> NCic.Appl (l@tl)
+ | C.Meta _ -> assert false
+ | C.Implicit _
+ | C.Sort _
+ | C.Const _
+ | C.Rel _ as t -> t
+ | C.Appl [] | C.Appl [_] -> assert false
+ | C.Appl l as orig ->
+    (match HExtlib.sharing_map (f k) l with
+      | C.Appl l :: tl -> C.Appl (l@tl)
       | l1 when l == l1 -> orig
-      | l1 -> NCic.Appl l1)
- | NCic.Prod (n,s,t) as orig ->
-     let s1 = f k s in let t1 = f (g (n,NCic.Decl s) k) t in
-     if t1 == t && s1 == s then orig else NCic.Prod (n,s1,t1)
- | NCic.Lambda (n,s,t) as orig -> 
-     let s1 = f k s in let t1 = f (g (n,NCic.Decl s) k) t in
-     if t1 == t && s1 == s then orig else NCic.Lambda (n,s1,t1)
- | NCic.LetIn (n,ty,t,b) as orig -> 
+      | l1 -> C.Appl l1)
+ | 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)
+ | C.Lambda (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.Lambda (n,s1,t1)
+ | C.LetIn (n,ty,t,b) as orig -> 
      let ty1 = f k ty in let t1 = f k t in
-     let b1 = f (g (n,NCic.Def (t,ty)) k) b in
-     if ty1 == ty && t1 == t && b1 == b then orig else NCic.LetIn (n,ty1,t1,b1)
- | NCic.Match (r,oty,t,pl) as orig -> 
-     let oty1 = f k oty in let t1 = f k t in let pl1 = sharing_map (f k) pl in
+     let b1 = f (g (n,C.Def (t,ty)) k) b in
+     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 oty1 = f k oty in let t1 = f k t in let pl1 = HExtlib.sharing_map (f k) pl in
      if oty1 == oty && t1 == t && pl1 == pl then orig 
-     else NCic.Match(r,oty1,t1,pl1)
+     else C.Match(r,oty1,t1,pl1)
 ;;