Stuff moved from old Matita.

[helm.git] / matita / components / ng_tactics / nCicTacReduction.ml

diff --git a/matita/components/ng_tactics/nCicTacReduction.ml b/matita/components/ng_tactics/nCicTacReduction.ml
new file mode 100644 (file)
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+++ b/matita/components/ng_tactics/nCicTacReduction.ml
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+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.      
+     \ /   This software is distributed as is, NO WARRANTY.     
+      V_______________________________________________________________ *)
+
+(* $Id: nCic.ml 9058 2008-10-13 17:42:30Z tassi $ *)
+ 
+let rec normalize ?(delta=0) ~subst ctx t =
+ let aux = normalize ~delta ~subst in
+  match NCicReduction.whd ~delta ~subst ctx t with
+     NCic.Meta (n,(s,lc)) ->
+      let l = NCicUtils.expand_local_context lc in
+      let l' = List.map (aux ctx) l in
+       if l = l' then t
+       else
+        NCic.Meta (n,(s,NCic.Ctx l))
+   | t -> NCicUtils.map (fun h ctx -> h::ctx) ctx aux t
+;;