internal static PartialParseResult<ExtensionSubtagCollection> Parse(TokenEnumerator tokens)
{
var subtagResult = ExtensionSubtag.Parse(tokens);
if (subtagResult.NothingToParse)
return PartialParseResult<ExtensionSubtagCollection>.Empty;
if (subtagResult.ErrorOccured)
return PartialParseResult<ExtensionSubtagCollection>.Error;
var resultCollection = new List<ExtensionSubtag>();
var usedSingletons = new bool[128];
while (true)
{
var subtag = subtagResult.Result;
if (usedSingletons[subtag.Singleton])
return PartialParseResult<ExtensionSubtagCollection>.Error;
usedSingletons[subtag.Singleton] = true;
resultCollection.Add(subtag);
subtagResult = ExtensionSubtag.Parse(tokens);
if (subtagResult.NothingToParse)
return PartialParseResult<ExtensionSubtagCollection>.Success(
new ExtensionSubtagCollection(resultCollection));
if (subtagResult.ErrorOccured)
return PartialParseResult<ExtensionSubtagCollection>.Error;
}
}
internal static PartialParseResult <PrivateUseSubtags> Parse(TokenEnumerator tokens)
{
if (!tokens.TokenIs(Singleton))
{
return(PartialParseResult <PrivateUseSubtags> .Empty);
}
tokens.ToNextToken();
var subtags = new List <string>();
while (tokens.CurrentTokenAvailable)
{
if (!isValidSubtag(tokens.Token))
{
return(PartialParseResult <PrivateUseSubtags> .Error);
}
subtags.Add(tokens.Token);
tokens.ToNextToken();
}
if (subtags.Count == 0)
{
return(PartialParseResult <PrivateUseSubtags> .Error);
}
return(PartialParseResult <PrivateUseSubtags> .Success(new PrivateUseSubtags(subtags)));
}
internal static PartialParseResult <ExtensionSubtag> Parse(TokenEnumerator tokens)
{
// Get the singleton
if (!tokens.CurrentTokenAvailable)
{
return(PartialParseResult <ExtensionSubtag> .Empty);
}
if (tokens.Token.Length != 1 || tokens.TokenIs(PrivateUseSubtags.Singleton))
{
return(PartialParseResult <ExtensionSubtag> .Empty);
}
var singleton = tokens.Token[0];
if (!isAsciiLetterOrDigit(singleton))
{
return(PartialParseResult <ExtensionSubtag> .Error);
}
if (!tokens.NextTokenAvailable)
{
return(PartialParseResult <ExtensionSubtag> .Error);
}
var sequence = new List <string>();
tokens.ToNextToken();
if (!isValidElement(tokens.Token))
{
return(PartialParseResult <ExtensionSubtag> .Error);
}
sequence.Add(tokens.Token);
// Get remaining elements
tokens.ToNextToken();
while (tokens.CurrentTokenAvailable)
{
if (tokens.Token.Length == 1) // next extension subtag or private use
{
break;
}
if (!isValidElement(tokens.Token))
{
return(PartialParseResult <ExtensionSubtag> .Error);
}
sequence.Add(tokens.Token);
tokens.ToNextToken();
}
return(PartialParseResult <ExtensionSubtag> .Success(new ExtensionSubtag(singleton, sequence)));
}
