From 7cfc4e5146be5666419451bdd516f1f3f264d24a Mon Sep 17 00:00:00 2001
From: Enrico Tassi <gareuselesinge@debian.org>
Date: Sun, 25 Jan 2015 14:42:51 +0100
Subject: Imported Upstream version 8.5~beta1+dfsg

---
 toplevel/locality.ml | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 toplevel/locality.ml

(limited to 'toplevel/locality.ml')

diff --git a/toplevel/locality.ml b/toplevel/locality.ml
new file mode 100644
index 00000000..f711dad9
--- /dev/null
+++ b/toplevel/locality.ml
@@ -0,0 +1,99 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(** * Managing locality *)
+
+let local_of_bool = function
+  | true -> Decl_kinds.Local
+  | false -> Decl_kinds.Global
+
+let check_locality locality_flag =
+  match locality_flag with
+  | Some b ->
+    let s = if b then "Local" else "Global" in
+    Errors.error ("This command does not support the \""^s^"\" prefix.")
+  | None -> ()
+
+(** Extracting the locality flag *)
+
+(* Commands which supported an inlined Local flag *)
+
+let enforce_locality_full locality_flag local =
+  let local =
+    match locality_flag with
+    | Some false when local ->
+	Errors.error "Cannot be simultaneously Local and Global."
+    | Some true when local ->
+	Errors.error "Use only prefix \"Local\"."
+    | None ->
+	if local then begin
+          Pp.msg_warning (Pp.str "Obsolete syntax: use \"Local\" as a prefix.");
+	  Some true
+	end else
+	None
+    | Some b -> Some b in
+  local
+
+(** Positioning locality for commands supporting discharging and export
+     outside of modules *)
+
+(* For commands whose default is to discharge and export:
+   Global is the default and is neutral;
+   Local in a section deactivates discharge,
+   Local not in a section deactivates export *)
+let make_non_locality = function Some false -> false | _ -> true
+
+let make_locality = function Some true -> true | _ -> false
+
+let enforce_locality locality_flag local =
+   make_locality (enforce_locality_full locality_flag local)
+
+let enforce_locality_exp locality_flag local =
+  match locality_flag, local with
+  | None, Some local -> local
+  | Some b, None -> local_of_bool b
+  | None, None -> Decl_kinds.Global
+  | Some _, Some _ -> Errors.error "Local non allowed in this case"
+
+(* For commands whose default is to not discharge but to export:
+   Global in sections forces discharge, Global not in section is the default;
+   Local in sections is the default, Local not in section forces non-export *)
+
+let make_section_locality =
+  function Some b -> b | None -> Lib.sections_are_opened ()
+
+let enforce_section_locality locality_flag local =
+  make_section_locality (enforce_locality_full locality_flag local)
+
+(** Positioning locality for commands supporting export but not discharge *)
+
+(* For commands whose default is to export (if not in section):
+   Global in sections is forbidden, Global not in section is neutral;
+   Local in sections is the default, Local not in section forces non-export *)
+
+let make_module_locality = function
+  | Some false ->
+      if Lib.sections_are_opened () then
+	Errors.error
+	  "This command does not support the Global option in sections.";
+      false
+  | Some true -> true
+  | None -> false
+
+let enforce_module_locality locality_flag local =
+  make_module_locality (enforce_locality_full locality_flag local)
+
+module LocalityFixme = struct
+  let locality = ref None
+  let set l = locality := l
+  let consume () =
+    let l = !locality in
+    locality := None;
+    l
+  let assert_consumed () = check_locality !locality
+end
-- 
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