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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(** * Managing locality *)
let locality_flag = ref None
let local_of_bool = function
| true -> Decl_kinds.Local
| false -> Decl_kinds.Global
let check_locality () =
match !locality_flag with
| Some (loc,b) ->
let s = if b then "Local" else "Global" in
Errors.user_err_loc
(loc,"",Pp.str ("This command does not support the \""^s^"\" prefix."))
| None -> ()
(** Extracting the locality flag *)
(* Commands which supported an inlined Local flag *)
let enforce_locality_full 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
Flags.if_warn
Pp.msg_warning (Pp.str"Obsolete syntax: use \"Local\" as a prefix.");
Some true
end else
None
| Some (_,b) -> Some b in
locality_flag := None;
local
(* Commands which did not supported an inlined Local flag (synonym of
[enforce_locality_full false]) *)
let use_locality_full () =
let r = Option.map snd !locality_flag in
locality_flag := None;
r
(** 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_locality = function Some true -> true | _ -> false
let use_locality () = make_locality (use_locality_full ())
let use_locality_exp () = local_of_bool (use_locality ())
let enforce_locality local = make_locality (enforce_locality_full local)
let enforce_locality_exp local = local_of_bool (enforce_locality local)
(* For commands whose default is not to discharge and not to export:
Global forces discharge and export;
Local is the default and is neutral *)
let use_non_locality () =
match use_locality_full () with Some false -> false | _ -> true
(* 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 use_section_locality () =
make_section_locality (use_locality_full ())
let enforce_section_locality local =
make_section_locality (enforce_locality_full 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 use_module_locality () =
make_module_locality (use_locality_full ())
let enforce_module_locality local =
make_module_locality (enforce_locality_full local)
|
