protected override string TryParse(ParseContext ctx)
{
var sb = new StringBuilder();
var currArg = ctx.PeekNext(ctx.FindNextCharNotInsideNormalBracket(',', true, forceEntireText: true) -
ctx.CurrentPosition);
for (var i = 0; i < currArg.Length; i++)
{
var c = currArg[i];
if (c == ':' && currArg.IndexOf(':', i + 1) == -1)
{
break;
}
sb.Append(c);
}
ctx.ReadNext(sb.Length);
return(!sb.IsEmpty() ? sb.ToString() : null);
}