public static string TextDirectionLanguageFile = null; //Set during testing
/// <summary>
/// Looks up the text direction for the specified language code in the appropriate .ldml file.
/// This lookup will not work with Paratext, which does not yet use an .ldml file.
/// </summary>
/// <param name="language">ISO 639 language code.</param>
/// <returns>Text direction (ltr or rtl), or ltr if not found.</returns>
public static string GetTextDirection(string language)
{
string[] langCoun = language.Split('-');
string direction = "ltr";
try
{
if (AppDomain.CurrentDomain.FriendlyName.ToLower() == "paratext.exe" ||
TextDirectionLanguageFile != null) // is paratext
{
string fileName = TextDirectionLanguageFile;
if (fileName == null)
{
SettingsHelper settingsHelper = new SettingsHelper(Param.DatabaseName);
fileName = settingsHelper.GetLanguageFilename();
}
foreach (string line in FileData.Get(fileName).Split(new[] { '\n' }))
{
if (line.StartsWith("RTL="))
{
direction = (line[4] == 'T') ? "rtl" : "ltr";
break;
}
}
}
else
{
string wsPath;
if (langCoun.Length < 2)
{
// try the language (no country code) (e.g, "en" for "en-US")
wsPath = PathCombine(Common.GetLDMLPath(), langCoun[0] + ".ldml");
}
else
{
// try the whole language expression (e.g., "ggo-Telu-IN")
wsPath = PathCombine(Common.GetLDMLPath(), language + ".ldml");
}
if (File.Exists(wsPath))
{
XmlDocument ldml = DeclareXMLDocument(false);
ldml.Load(wsPath);
var nsmgr = new XmlNamespaceManager(ldml.NameTable);
nsmgr.AddNamespace("palaso", "urn://palaso.org/ldmlExtensions/v1");
var node = ldml.SelectSingleNode("//orientation/@characters", nsmgr);
if (node != null)
{
// get the text direction specified by the .ldml file
direction = (node.Value.ToLower().Equals("right-to-left")) ? "rtl" : "ltr";
}
}
}
}
catch
{
direction = "ltr";
}
return direction;
}
