From 9043add656177eeac1491a73d2f3ab92bec0013c Mon Sep 17 00:00:00 2001
From: Benjamin Barenblat <bbaren@debian.org>
Date: Sat, 29 Dec 2018 14:31:27 -0500
Subject: Imported Upstream version 8.8.2

---
 plugins/ltac/tactic_option.ml | 53 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 plugins/ltac/tactic_option.ml

(limited to 'plugins/ltac/tactic_option.ml')

diff --git a/plugins/ltac/tactic_option.ml b/plugins/ltac/tactic_option.ml
new file mode 100644
index 00000000..f6b2e5b3
--- /dev/null
+++ b/plugins/ltac/tactic_option.ml
@@ -0,0 +1,53 @@
+(************************************************************************)
+(*         *   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)         *)
+(************************************************************************)
+
+open Libobject
+open Pp
+
+let declare_tactic_option ?(default=Tacexpr.TacId []) name =
+  let locality = Summary.ref false ~name:(name^"-locality") in
+  let default_tactic_expr : Tacexpr.glob_tactic_expr ref =
+    Summary.ref default ~name:(name^"-default-tacexpr")
+  in
+  let default_tactic : Tacexpr.glob_tactic_expr ref =
+    Summary.ref !default_tactic_expr ~name:(name^"-default-tactic")
+  in
+  let set_default_tactic local t =
+    locality := local;
+    default_tactic_expr := t;
+    default_tactic := t
+  in
+  let cache (_, (local, tac)) = set_default_tactic local tac in
+  let load (_, (local, tac)) =
+    if not local then set_default_tactic local tac
+  in
+  let subst (s, (local, tac)) =
+    (local, Tacsubst.subst_tactic s tac)
+  in
+  let input : bool * Tacexpr.glob_tactic_expr -> obj =
+    declare_object
+      { (default_object name) with
+	cache_function = cache;
+	load_function = (fun _ -> load);
+	open_function = (fun _ -> load);
+	classify_function = (fun (local, tac) ->
+	  if local then Dispose else Substitute (local, tac));
+	subst_function = subst}
+  in
+  let put local tac =
+    set_default_tactic local tac;
+    Lib.add_anonymous_leaf (input (local, tac))
+  in
+  let get () = !locality, Tacinterp.eval_tactic !default_tactic in
+  let print () = 
+    Pptactic.pr_glob_tactic (Global.env ()) !default_tactic_expr ++
+      (if !locality then str" (locally defined)" else str" (globally defined)")
+  in
+  put, get, print
-- 
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