/// <summary> returns the lexer that's gonna parse a octal integer number (valid patterns are: 0, 07, 017, 0371 jfun.yan.etc.),
/// and convert the string to a Long token.
/// an octal number has to start with 0.
/// </summary>
/// <returns> the lexer.
/// </returns>
public static Lexer LexOctLong()
{
string name = "oct integer literal";
return(Lex(Scanners.Delimited(Scanners.IsPattern(name, Patterns.IsOctInteger(), "octInteger")),
Tokenizers.ForOctLong).Rename(name));
}