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+(************************************************************************)
+(* * The Coq Proof Assistant / The Coq Development Team *)
+(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
+(* <O___,, * (see CREDITS file for the list of authors) *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(* * (see LICENSE file for the text of the license) *)
+(************************************************************************)
+(**************************************************************************)
+(* *)
+(* Omega: a solver of quantifier-free problems in Presburger Arithmetic *)
+(* *)
+(* Pierre Crégut (CNET, Lannion, France) *)
+(* *)
+(**************************************************************************)
+
+
+DECLARE PLUGIN "omega_plugin"
+
+{
+
+open Ltac_plugin
+open Names
+open Coq_omega
+open Stdarg
+
+let eval_tactic name =
+ let dp = DirPath.make (List.map Id.of_string ["PreOmega"; "omega"; "Coq"]) in
+ let kn = KerName.make2 (ModPath.MPfile dp) (Label.make name) in
+ let tac = Tacenv.interp_ltac kn in
+ Tacinterp.eval_tactic tac
+
+let omega_tactic l =
+ let tacs = List.map
+ (function
+ | "nat" -> eval_tactic "zify_nat"
+ | "positive" -> eval_tactic "zify_positive"
+ | "N" -> eval_tactic "zify_N"
+ | "Z" -> eval_tactic "zify_op"
+ | s -> CErrors.user_err Pp.(str ("No Omega knowledge base for type "^s)))
+ (Util.List.sort_uniquize String.compare l)
+ in
+ Tacticals.New.tclTHEN
+ (Tacticals.New.tclREPEAT (Tacticals.New.tclTHENLIST tacs))
+ (omega_solver)
+
+}
+
+TACTIC EXTEND omega
+| [ "omega" ] -> { omega_tactic [] }
+END
+
+TACTIC EXTEND omega'
+| [ "omega" "with" ne_ident_list(l) ] ->
+ { omega_tactic (List.map Names.Id.to_string l) }
+| [ "omega" "with" "*" ] -> { omega_tactic ["nat";"positive";"N";"Z"] }
+END
+