sortedby implemented and new uri result format

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

diff --git a/helm/ocaml/mathql_interpreter/sortedby.ml b/helm/ocaml/mathql_interpreter/sortedby.ml
new file mode 100644 (file)
index 0000000..a629266
--- /dev/null
+++ b/helm/ocaml/mathql_interpreter/sortedby.ml
@@ -0,0 +1,54 @@
+(* 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)
+   )
+  )
+;;
+