private void ReadNumberHex()
{
while (char.IsLetterOrDigit(Current))
{
_position++;
}
var length = _position - _start - 2;
var text = _text.ToString(_start + 2, length);
if (!int.TryParse(text, System.Globalization.NumberStyles.HexNumber, null, out var value))
{
var span = new TextSpan(_start, length);
var location = new TextLocation(_text, span);
_diagnostics.ReportInvalidHexNumber(location, text);
}
_value = value;
_kind = SyntaxKind.NumberToken;
}
