public TokenizerException(string msg, PositionalTextReader reader)
: this(msg, reader.Source, reader.LineNumber, reader.ColumnNumber)
{
}
/// <summary>
/// Creates a positional text reader from
/// a TextReader
/// </summary>
/// <param name="text">Text to be read</param>
public Tokenizer(TextReader text)
{
_reader = new PositionalTextReader(text, text.GetType().Name);
NextChar();
}