+
+let split_with_whd (c, t) =
+ let add s v c = Some (s, Cic.Decl v) :: c in
+ let rec aux whd a n c = function
+ | Cic.Prod (s, v, t) -> aux false ((c, v) :: a) (succ n) (add s v c) t
+ | v when whd -> (c, v) :: a, n
+ | v -> aux true a n c (CicReduction.whd c v)
+ in
+ aux false [] 0 c t
+
+let split_with_normalize (c, t) =
+ let add s v c = Some (s, Cic.Decl v) :: c in
+ let rec aux a n c = function
+ | Cic.Prod (s, v, t) -> aux ((c, v) :: a) (succ n) (add s v c) t
+ | v -> (c, v) :: a, n
+ in
+ aux [] 0 c (CicReduction.normalize c t)
+
+ (* menv sorting *)
+module OT =
+ struct
+ type t = Cic.conjecture
+ let compare (i,_,_) (j,_,_) = Pervasives.compare i j
+ end
+module MS = HTopoSort.Make(OT)
+let relations_of_menv m c =
+ let i, ctx, ty = c in
+ let m = List.filter (fun (j,_,_) -> j <> i) m in
+ let m_ty = List.map fst (CicUtil.metas_of_term ty) in
+ let m_ctx =
+ List.flatten
+ (List.map
+ (function
+ | None -> []
+ | Some (_,Cic.Decl t) ->
+ List.map fst (CicUtil.metas_of_term ty)
+ | Some (_,Cic.Def (t,ty)) ->
+ List.map fst (CicUtil.metas_of_term ty) @
+ List.map fst (CicUtil.metas_of_term t))
+ ctx)
+ in
+ let metas = HExtlib.list_uniq (List.sort compare (m_ty @ m_ctx)) in
+ List.filter (fun (i,_,_) -> List.exists ((=) i) metas) m
+;;
+let sort_metasenv (m : Cic.metasenv) =
+ (MS.topological_sort m (relations_of_menv m) : Cic.metasenv)
+;;