summaryrefslogtreecommitdiff
path: root/toplevel/locality.ml
diff options
context:
space:
mode:
Diffstat (limited to 'toplevel/locality.ml')
-rw-r--r--toplevel/locality.ml99
1 files changed, 99 insertions, 0 deletions
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