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181 | -----------------------------------------------------------------------
-- util-locales -- Locale support
-- Copyright (C) 2001 - 2022 Stephane Carrez
-- Written by Stephane Carrez (Stephane.Carrez@gmail.com)
--
-- 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.
-----------------------------------------------------------------------
with Ada.Strings.Hash;
package body Util.Locales is
-- ------------------------------
-- Get the lowercase two-letter ISO-639 code.
-- ------------------------------
function Get_Language (Loc : in Locale) return String is
begin
if Loc = null then
return "";
else
return Loc (1 .. 2);
end if;
end Get_Language;
-- ------------------------------
-- Get the ISO 639-2 language code.
-- ------------------------------
function Get_ISO3_Language (Loc : in Locale) return String is
begin
if Loc = null or else Loc'Length <= 3 then
return "";
end if;
if Loc'Length <= 6 then
return Loc (4 .. 6);
end if;
if Loc'Length <= 13 then
return Loc (7 .. 9);
end if;
return Loc (10 .. 15);
end Get_ISO3_Language;
-- ------------------------------
-- Get the uppercase two-letter ISO-3166 code.
-- ------------------------------
function Get_Country (Loc : in Locale) return String is
begin
if Loc = null or else Loc'Length <= 2 or else Loc (3) /= '_' then
return "";
else
return Loc (4 .. 5);
end if;
end Get_Country;
-- ------------------------------
-- Get the ISO-3166-2 country code.
-- ------------------------------
function Get_ISO3_Country (Loc : in Locale) return String is
begin
if Loc = null or else Loc'Length <= 9 then
return "";
else
return Loc (Loc'Last - 2 .. Loc'Last);
end if;
end Get_ISO3_Country;
-- ------------------------------
-- Get the variant code
-- ------------------------------
function Get_Variant (Loc : in Locale) return String is
begin
if Loc = null or else Loc'Length <= 13 then
return "";
else
return Loc (7 .. 8);
end if;
end Get_Variant;
-- ------------------------------
-- Get the locale for the given language code
-- ------------------------------
function Get_Locale (Language : in String) return Locale is
Length : constant Natural := Language'Length;
Lower : Natural := Locales'First;
Upper : Natural := Locales'Last;
Pos : Natural;
Result : Locale;
begin
while Lower <= Upper loop
Pos := (Lower + Upper) / 2;
Result := Locales (Pos);
if Result'Length < Length then
if Result.all < Language (Language'First .. Language'First + Result'Length - 1) then
Lower := Pos + 1;
else
Upper := Pos - 1;
end if;
elsif Result'Length > Length and then Result (Length + 1) = '.'
and then Result (1 .. Length) = Language
then
return Result;
elsif Result (1 .. Length) < Language then
Lower := Pos + 1;
else
Upper := Pos - 1;
end if;
end loop;
return NULL_LOCALE;
end Get_Locale;
-- ------------------------------
-- Get the locale for the given language and country code
-- ------------------------------
function Get_Locale (Language : in String;
Country : in String) return Locale is
begin
if Language'Length /= 2 or else (Country'Length /= 0 and then Country'Length /= 2) then
return NULL_LOCALE;
elsif Country'Length = 0 then
return Get_Locale (Language);
else
return Get_Locale (Language & "_" & Country);
end if;
end Get_Locale;
-- ------------------------------
-- Get the locale for the given language, country and variant code
-- ------------------------------
function Get_Locale (Language : in String;
Country : in String;
Variant : in String) return Locale is
begin
if Language'Length /= 2
or else (Country'Length /= 0 and then Country'Length /= 2)
or else (Variant'Length /= 0 and then Variant'Length /= 2)
then
return NULL_LOCALE;
end if;
if Country'Length = 0 and then Variant'Length = 0 then
return Get_Locale (Language);
elsif Variant'Length = 0 then
return Get_Locale (Language, Country);
else
return Get_Locale (Language & "_" & Country & "_" & Variant);
end if;
end Get_Locale;
-- ------------------------------
-- Get the locale code in the form <i>language</i>_<i>country</i>_<i>variant</i>.
-- ------------------------------
function To_String (Loc : in Locale) return String is
begin
if Loc = null then
return "";
elsif Loc'Length > 3 and then Loc (3) = '.' then
return Loc (1 .. 2);
elsif Loc'Length > 6 and then Loc (6) = '.' then
return Loc (1 .. 5);
else
return Loc (1 .. 8);
end if;
end To_String;
-- ------------------------------
-- Compute the hash value of the locale.
-- ------------------------------
function Hash (Loc : in Locale) return Ada.Containers.Hash_Type is
begin
return Ada.Strings.Hash (Loc.all);
end Hash;
end Util.Locales;
|