/// <summary>
/// Validate and add number created using digits
/// </summary>
/// <param name="digits">digits to use to form number</param>
/// <returns>true if success, false otherwise</returns>
private bool ValidateAndAddLotteryNumber(char[] digits)
{
LotteryNumber num;
var res = LotteryNumber.Create(out num, digits);
if (!res)
{
return(false);
}
return(AddLotteryNumber(num));
}
/// <summary>
/// Creates a lottery number
/// </summary>
/// <param name="num">out parameter with created object</param>
/// <param name="digits">digits to use for creation</param>
/// <returns>true if success</returns>
public static bool Create(out LotteryNumber num, params char[] digits)
{
try
{
num = new LotteryNumber(digits);
return(true);
}
catch (ArgumentException)
{
num = null;
return(false);
}
}
/// <summary>
/// Adds a lottery number to the _numbersSoFar list if it is unique
/// </summary>
/// <param name="num">number to add</param>
/// <returns>true if unique, false otherwise</returns>
private bool AddLotteryNumber(LotteryNumber num)
{
if (num == null)
{
throw new ArgumentNullException(nameof(num));
}
//do unique check
if (_numberListSoFar.Find(n => n.Equals(num)) != null)
{
return(false);
}
_numberListSoFar.Add(num);
_parserState.NumbersSeen += 1;
return(true);
}
/// <summary>
/// Matches a single digit, and moves token forwards if it is a digit
/// </summary>
/// <returns>true if next char is digit, else false</returns>
private bool MatchDigit()
{
if (GetRemainingLength() == 0)
{
return(false);
}
char tok = GetNextToken();
if (!LotteryNumber.IsDigit(tok))
{
return(false);
}
MoveNext();
return(true);
}
/// <summary>
/// Equality is based on decimal value so that 01 are 1 equal
/// </summary>
/// <param name="other"></param>
/// <returns>true if equals</returns>
public bool Equals(LotteryNumber other)
{
return(_number == other?._number);
}