Stuff moved from old Matita.

[helm.git] / matita / components / extlib / discrimination_tree.mli

diff --git a/matita/components/extlib/discrimination_tree.mli b/matita/components/extlib/discrimination_tree.mli
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+(* Copyright (C) 2005, 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/.
+ *)
+
+
+type 'a path_string_elem = 
+  | Constant of 'a * int (* name, arity *)
+  | Bound of int * int (* rel, arity *)
+  | Variable (* arity is 0 *)
+  | Proposition (* arity is 0 *) 
+  | Datatype (* arity is 0 *) 
+  | Dead (* arity is 0 *) 
+;;  
+
+type 'a path = ('a path_string_elem) list;;
+
+module type Indexable = sig
+  type input
+  type constant_name
+  val compare: 
+    constant_name path_string_elem -> 
+    constant_name path_string_elem -> int
+  val string_of_path : constant_name path -> string
+  val path_string_of : input -> constant_name path
+end
+
+module type DiscriminationTree  =
+    sig
+
+      type input 
+      type data
+      type dataset
+      type constant_name
+      type t
+
+      val iter : t -> (constant_name path -> dataset -> unit) -> unit
+      val fold : t -> (constant_name path -> dataset -> 'b -> 'b) -> 'b -> 'b
+
+      val empty : t
+      val index : t -> input -> data -> t
+      val remove_index : t -> input -> data -> t
+      val in_index : t -> input -> (data -> bool) -> bool
+      val retrieve_generalizations : t -> input -> dataset
+      val retrieve_unifiables : t -> input -> dataset
+    end
+
+
+module Make (I : Indexable) (A : Set.S) : DiscriminationTree 
+with type constant_name = I.constant_name and type input = I.input
+and type data = A.elt and type dataset = A.t
+