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[helm.git] / helm / ocaml / mathql_interpreter / sortedby.ml

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-(* Copyright (C) 2000, HELM Team.
- * 
- * This file is part of HELM, an Hypertextual, Electronic
- * Library of Mathematics, developed at the Computer Science
- * Department, University of Bologna, Italy.
- * 
- * HELM is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- * 
- * HELM is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with HELM; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA  02111-1307, USA.
- * 
- * For details, see the HELM World-Wide-Web page,
- * http://cs.unibo.it/helm/.
- *)
-
-(*
- * implementazione del comando SORTEDBY
- *)
-
-open MathQL;;
-open Func;;
-open Utility;;
-
-(*
- * implementazione del comando SORTEDBY
- *)
-let sortedby_ex alist order afunc =
- [List.hd alist]
- @
- List.map
-  (List.tl)
-  (Sort.list
-   (fun a b ->
-    match order with
-       MQAsc  -> (List.hd a) < (List.hd b)
-    |  MQDesc -> (List.hd a) > (List.hd b)
-   )
-   (List.map
-    (fun l -> [apply_func afunc (List.hd l)] @ l)
-    (List.tl alist)
-   )
-  )
-;;
-