commit of galax mathql interpreter

[helm.git] / helm / ocaml / mathql_interpreter_galax / letin.ml

diff --git a/helm/ocaml/mathql_interpreter_galax/letin.ml b/helm/ocaml/mathql_interpreter_galax/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 ()
+;;
+