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[helm.git] / helm / ocaml / mathql_interpreter / letin.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://www.cs.unibo.it/helm/.
- *)
-
-(*
- * implementazione dei comandi LETIN e REF
- *)
-
-open MathQL;;
-
-let letin_pool = ref None;;
-
-let see_pool () =
- match !letin_pool with
-    None -> print_endline "None"
-  | Some c -> List.iter (fun elem -> print_endline (fst elem)) c
-;;
-
-let letin_ex rvar alist =
- let _ = 
-  match !letin_pool with
-     Some pool -> letin_pool := Some ((rvar,alist)::(List.remove_assoc rvar pool))
-   | None -> letin_pool := Some ([(rvar,alist)])
- in
-(*  let _ = see_pool () in*)
-  []
-;;
-
-let letref_ex rvar =
- match !letin_pool with
-    None -> []
-  | Some pool ->
-     (
-      try
-       List.assoc rvar pool
-      with
-       Not_found -> []
-     )
-;;
-
-let letdispose () =
- let _ = letin_pool = ref None in ()
-;;
-