/// <summary>
/// 4.4.23. Unicode-range State
/// </summary>
CssToken UnicodeRange(Char current)
{
for (int i = 0; i < 6; i++)
{
if (!current.IsHex())
{
break;
}
_stringBuffer.Append(current);
current = Next;
}
if (_stringBuffer.Length != 6)
{
for (int i = 0; i < 6 - _stringBuffer.Length; i++)
{
if (current != Specification.QuestionMark)
{
current = Previous;
break;
}
_stringBuffer.Append(current);
current = Next;
}
var range = FlushBuffer();
var start = range.Replace(Specification.QuestionMark, '0');
var end = range.Replace(Specification.QuestionMark, 'F');
return(CssToken.Range(start, end));
}
else if (current == Specification.Minus)
{
current = Next;
if (current.IsHex())
{
var start = _stringBuffer.ToString();
_stringBuffer.Clear();
for (int i = 0; i < 6; i++)
{
if (!current.IsHex())
{
current = Previous;
break;
}
_stringBuffer.Append(current);
current = Next;
}
var end = FlushBuffer();
return(CssToken.Range(start, end));
}
else
{
Back(2);
return(CssToken.Range(FlushBuffer(), null));
}
}
else
{
Back();
return(CssToken.Range(FlushBuffer(), null));
}
}