- renamed ocaml/ to components/

[helm.git] / helm / ocaml / tactics / history.ml

diff --git a/helm/ocaml/tactics/history.ml b/helm/ocaml/tactics/history.ml
deleted file mode 100644 (file)
index 7559f36..0000000
--- a/helm/ocaml/tactics/history.ml
+++ /dev/null
@@ -1,86 +0,0 @@
-(* Copyright (C) 2004, 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://helm.cs.unibo.it/
- *)
-
-(* $Id$ *)
-
-exception History_failure
-
-class ['a] history size =
-  let unsome = function Some x -> x | None -> assert false in
-  object (self)
-
-    val history_data = Array.create (size + 1) None
-
-    val mutable history_hd = 0  (* rightmost index *)
-    val mutable history_cur = 0 (* current index *)
-    val mutable history_tl = 0  (* leftmost index *)
-
-    method private is_empty = history_data.(history_cur) = None
-
-    method push (status: 'a) =
-      if self#is_empty then
-        history_data.(history_cur) <- Some status
-      else begin
-        history_cur <- (history_cur + 1) mod size;
-        history_data.(history_cur) <- Some status;
-        history_hd <- history_cur;  (* throw away fake future line *)
-        if history_hd = history_tl then (* tail overwritten *)
-          history_tl <- (history_tl + 1) mod size
-      end
-
-    method undo = function
-      | 0 -> unsome history_data.(history_cur)
-      | steps when steps > 0 ->
-          let max_undo_steps =
-            if history_cur >= history_tl then
-              history_cur - history_tl
-            else
-              history_cur + (size - history_tl)
-          in
-          if steps > max_undo_steps then
-            raise History_failure;
-          history_cur <- history_cur - steps;
-          if history_cur < 0 then (* fix underflow *)
-            history_cur <- size + history_cur;
-          unsome history_data.(history_cur)
-      | steps (* when steps > 0 *) -> self#redo ~-steps
-
-    method redo = function
-      | 0 -> unsome history_data.(history_cur)
-      | steps when steps > 0 ->
-          let max_redo_steps =
-            if history_hd >= history_cur then
-              history_hd - history_cur
-            else
-              history_hd + (size - history_cur)
-          in
-          if steps > max_redo_steps then
-            raise History_failure;
-          history_cur <- (history_cur + steps) mod size;
-          unsome history_data.(history_cur)
-      | steps (* when steps > 0 *) -> self#undo ~-steps
-
-  end
-