From 9bd50f57560e6877c3829b788bab2c8c063678a4 Mon Sep 17 00:00:00 2001
From: Enrico Tassi <enrico.tassi@inria.fr>
Date: Mon, 22 Sep 2008 15:35:20 +0000
Subject: [PATCH] new iterator

---
 .../components/ng_kernel/nCicUtils.ml         | 36 +++++++++++++++++++
 .../components/ng_kernel/nCicUtils.mli        |  3 ++
 2 files changed, 39 insertions(+)

diff --git a/helm/software/components/ng_kernel/nCicUtils.ml b/helm/software/components/ng_kernel/nCicUtils.ml
index f4f77a367..74d1a7834 100644
--- a/helm/software/components/ng_kernel/nCicUtils.ml
+++ b/helm/software/components/ng_kernel/nCicUtils.ml
@@ -80,3 +80,39 @@ 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)
+;;
diff --git a/helm/software/components/ng_kernel/nCicUtils.mli b/helm/software/components/ng_kernel/nCicUtils.mli
index c87dd6638..1560094dc 100644
--- a/helm/software/components/ng_kernel/nCicUtils.mli
+++ b/helm/software/components/ng_kernel/nCicUtils.mli
@@ -27,3 +27,6 @@ val fold:
 val map:
  (NCic.hypothesis -> 'k -> 'k) -> 'k ->
  ('k -> NCic.term -> NCic.term) -> NCic.term -> NCic.term
+val map_term_fold_a:
+ (NCic.hypothesis -> 'k -> 'k) -> 'k ->
+ ('k -> 'a -> NCic.term -> 'a * NCic.term) -> 'a -> NCic.term -> 'a * NCic.term
-- 
2.39.2