internal static PrivateUseSubtags Parse(LanguageTag.TokenEnumerator tokens)
{
var result = new PrivateUseSubtags();
if (!tokens.TokenIs(Singleton))
{
throw new FormatException("unexpected subtag '" + tokens.Token + "'");
}
var subtags = new List <string>();
while (tokens.NextTokenAvailable) // get all subtags
{
tokens.ToNextToken();
subtags.Add(ValidateSubtag(tokens.Token));
}
if (subtags.Count == 0)
{
throw new FormatException("private use subtags not contain elements");
}
result._subtags = subtags.ToArray();
return(result);
}
internal static ExtensionSubtag?TryParse(LanguageTag.TokenEnumerator tokens)
{
if (!tokens.CurrentTokenAvailable) // get singletone
{
return(null);
}
if (tokens.Token.Length != 1)
{
return(null);
}
if (tokens.TokenIs(PrivateUseSubtags.Singleton))
{
return(null);
}
char singleton = ValidateSingleton(tokens.Token[0]);
if (!tokens.NextTokenAvailable)
{
throw new FormatException("extension subtag '" + singleton + "' not contain elements");
}
var sequence = new List <string>();
tokens.ToNextToken();
sequence.Add(ValidateElement(tokens.Token));
tokens.ToNextToken(); // get remaining elements
while (tokens.CurrentTokenAvailable)
{
if (tokens.Token.Length == 1) // next extension subtag or private use
{
break;
}
sequence.Add(ValidateElement(tokens.Token));
tokens.ToNextToken();
}
var result = new ExtensionSubtag();
result.Singleton = singleton;
result._sequence = sequence.ToArray();
return(result);
}
