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i18n_locale.erl
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i18n_locale.erl
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% vim: set filetype=erlang shiftwidth=4 tabstop=4 expandtab tw=80:
%%% =====================================================================
%%% Copyright 2011 Uvarov Michael
%%%
%%% Licensed under the Apache License, Version 2.0 (the "License");
%%% you may not use this file except in compliance with the License.
%%% You may obtain a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing, software
%%% distributed under the License is distributed on an "AS IS" BASIS,
%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%% See the License for the specific language governing permissions and
%%% limitations under the License.
%%%
%%% $Id$
%%%
%%% @copyright 2010-2011 Michael Uvarov
%%% @author Michael Uvarov <arcusfelis@gmail.com>
%%% =====================================================================
%%% @doc This module containg functions to manage the locale of the process.
-module(i18n_locale).
-include("i18n.hrl").
-define(SERVER, 'i18n_locale_server').
-export([set_locale/1, set_default_locale/1, get_locale/0]).
-export([base_name/1, parent_locale/1]).
-type i18n_locale_id() :: atom().
%% @doc Set the locale of this process.
%% It will affect on all case-sensitive operations
%% when the locale parameter will be skipped.
-spec set_locale(i18n_locale_id()) -> i18n_locale_id().
set_locale(Value) ->
LName = ?TRY_ATOM(?IM:locale_name(Value)),
set_value('i18n_locale', fix_locale(LName)).
%% @doc Extract the locale of all processes, in which
%% there is no call of `set_locale/1'.
-spec set_default_locale(i18n_locale_id()) -> i18n_locale_id().
set_default_locale(Value) ->
set_default_value('i18n_locale', fix_locale(Value)).
%% @doc Extract the locale of this process
-spec get_locale() -> i18n_locale_id().
get_locale() ->
get_value('i18n_locale').
%% @doc `ru_RU@col=COL' -> `ru_RU'
-spec base_name(i18n_locale_id()) -> i18n_locale_id().
base_name(LocaleId) ->
fix_locale(?TRY_ATOM(?IM:locale_base_name(LocaleId))).
%% @doc `ru_RU' -> `ru'
-spec parent_locale(i18n_locale_id()) -> i18n_locale_id().
parent_locale(Locale) ->
fix_locale(?TRY_ATOM(?IM:locale_parent(Locale))).
%%
%% Helpers
%%
fix_locale('') -> 'root';
fix_locale(X) -> X.
set_value(Key, Value) ->
erlang:put(Key, Value),
Value.
set_default_value(Key, Value) ->
?SERVER:set_default(Key, Value),
Value.
get_value(Key) ->
case erlang:get(Key) of
'undefined' ->
% Get a global value
Value = ?SERVER:get_default(Key),
erlang:put(Key, Value),
Value;
Value ->
Value
end.