Localization: Message translation service
League includes message translation service for application localization. Translation data is read from XLIFF files. Translation data in XLIFF format can be edited by large number of tools, one of them is Qt Linguist from Qt by Nokia.
Application API
Package League.Translator provides API to load translation data and to translate messages.
package League.Translator is
function Translate
(Compilation_Unit : League.Strings.Universal_String;
Source_Text : League.Strings.Universal_String;
Disambiguation : League.Strings.Universal_String
:= League.Strings.Empty_Universal_String)
return League.Strings.Universal_String;
-- Translates message.
procedure Initialize (File : String);
-- Loads translations from the specified file.
procedure Finalize;
-- Release resources.
end League.Translator;
Procedure Initialize loads translation data from the specified file and must be called before and messages are translated.
Procedure Finalize clear translation data and release all resource, it must be called once before application exit.
Function Translate translates message specified by parameter Source_Text. It returns translated message if translation data for it was loaded; otherwise it returns the same text.
Example
Complete example is present in examples/translator directory.
with League.Strings;
with League.Translator;
with Put_Line;
procedure Hello is
function "-"
(Item : Wide_Wide_String) return League.Strings.Universal_String is
begin
return
League.Translator.Translate
(League.Strings.To_Universal_String ("HELLO"),
League.Strings.To_Universal_String (Item));
end "-";
begin
League.Translator.Initialize ("hello.xlf");
Put_Line (-"Hello, world!");
League.Translator.Finalize;
end Hello;
Application loads translation data from the hello.xlf file, then translates 'Hello, world!' and output translated string.
Minimal content for translation data file:
<?xml version="1.0" encoding="UTF-8"?>
<xliff version="1.2" xmlns="urn:oasis:names:tc:xliff:document:1.2">
<file original="hello.adb" datatype="plaintext" source-language="en" target-language="ru"><body>
<group restype="x-trolltech-linguist-context" resname="HELLO">
<trans-unit id="_msg1">
<source xml:space="preserve">Hello, world!</source>
<target xml:space="preserve">Здравствуй, мир!</target>
</trans-unit>
</group>
</body></file>
</xliff>
