first check in of continuationals implementation

[helm.git] / helm / ocaml / tactics / continuationals.mli

diff --git a/helm/ocaml/tactics/continuationals.mli b/helm/ocaml/tactics/continuationals.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://helm.cs.unibo.it/
+ *)
+
+exception Error of string
+
+module type Engine =
+sig
+  type goal
+  type conjecture
+  type metasenv = conjecture list
+  type tactic
+
+  val goal_of_conjecture: conjecture -> goal
+  val is_goal_in_metasenv: metasenv -> goal -> bool
+
+  val apply_tactic:
+    tactic -> metasenv -> goal ->
+      metasenv * goal list * goal list
+end
+
+module Make (E:Engine) :
+sig
+  type goal_switch = Open of E.goal | Closed of E.goal
+  type 'a stack = 'a list
+  type status =
+    E.metasenv * ((int * goal_switch) list * E.goal list * E.goal list) stack
+
+  type tactical =
+    | Tactic of E.tactic
+    | Skip
+
+  type t =
+    | Dot
+    | Semicolon
+    | Branch
+    | Shift of int option
+    | Merge
+    | Select of E.goal list
+    | End_select
+    | Tactical of tactical
+
+  val eval: t -> status -> status
+end
+