branch for universe

[helm.git] / components / acic_procedural / proceduralMode.ml

diff --git a/components/acic_procedural/proceduralMode.ml b/components/acic_procedural/proceduralMode.ml
new file mode 100644 (file)
index 0000000..e13846f
--- /dev/null
+++ b/components/acic_procedural/proceduralMode.ml
@@ -0,0 +1,57 @@
+(* Copyright (C) 2003-2005, 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/.
+ *)
+
+module C   = Cic
+module PEH = ProofEngineHelpers
+
+module Cl = ProceduralClassify
+
+let is_eliminator = function
+   | _ :: (_, C.MutInd _) :: _               -> true
+   | _ :: (_, C.Appl (C.MutInd _ :: _)) :: _ -> true
+   | _                                       -> false
+
+let is_const = function
+   | C.Sort _
+   | C.Const _ 
+   | C.Var _ 
+   | C.MutInd _
+   | C.MutConstruct _ -> true 
+   | _                -> false 
+
+let rec is_appl b = function
+   | C.Appl (hd :: tl) -> List.fold_left is_appl (is_const hd) tl
+   | t when is_const t -> b
+   | C.Rel _           -> b   
+   | _                 -> false 
+
+let bkd c t =
+   let classes, rc = Cl.classify c t in
+   let premises, _ = PEH.split_with_whd (c, t) in
+   match rc with
+      | Some (i, j, _, _) when i > 1 && i <= List.length classes && is_eliminator premises -> true
+      | _ ->
+         let _, conclusion = List.hd premises in
+         is_appl true conclusion