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

diff --git a/components/acic_procedural/proceduralMode.ml b/components/acic_procedural/proceduralMode.ml
index bd2c3a438c9fce26563f6eb04a6917dad5246a0d..e13846fc85a3ddee2b6dbb4f805be0ab7fac1de6 100644 (file)
--- a/components/acic_procedural/proceduralMode.ml
+++ b/components/acic_procedural/proceduralMode.ml
@@ -23,9 +23,16 @@
  * http://cs.unibo.it/helm/.
  *)
 
-module C  = Cic
+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 _ 
@@ -41,5 +48,10 @@ let rec is_appl b = function
    | _                 -> false 
 
 let bkd c t =
-   let ts, _ = Cl.split c t in
-   is_appl true (List.hd ts)
+   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