static void Main(string[] args)
{
PhoneNumber phoneNumber = new PhoneNumber();
int number = 9;
while (phoneNumber.DigitCount < 7)
{
phoneNumber.TryAdd(new Key(number, null));
number--;
}
Console.WriteLine(phoneNumber);
}
public void given_a_seven_digit_number()
{
before = () => phoneNumber = new PhoneNumber();
context["Start number can not be zero or one"] = () =>
{
specify = () => phoneNumber.TryAdd(0).should_be_false();
specify = () => phoneNumber.TryAdd(1).should_be_false();
};
context["Try add returns false for invalid keys"] = () =>
{
specify = () => phoneNumber.TryAdd(-1).should_be_false();
};
context["When Adding a second number"] = () =>
{
before = () => phoneNumber.TryAdd(3).should_be_true();
specify = () => phoneNumber.TryAdd(-1).should_be_false();
specify = () => phoneNumber.TryAdd(0).should_be_true();
specify = () => phoneNumber.TryAdd(1).should_be_true();
};
context["Given a filled number"] = () =>
{
before = () =>
{
int number = 9;
while (phoneNumber.DigitCount < 7)
{
phoneNumber.TryAdd(number);
number--;
}
};
specify = () => phoneNumber.DigitCount.should_be(7);
Console.WriteLine("Composed phone number: " + phoneNumber);
context["Can not add an eigth number"] = () =>
{
specify = () => phoneNumber.TryAdd(2).should_be_false();
};
};
}
public List<PhoneNumber> GetNumbersStartingFrom(int startDigit)
{
var accruedNumbers = new List<PhoneNumber>();
if (!PhoneNumber.IsValidStartDigit(startDigit))
return accruedNumbers.ToList();
var number = new PhoneNumber();
if (number.TryAdd(startDigit))
{
AddToDigitSequence(accruedNumbers, number);
}
return accruedNumbers.Where(c => c.DigitCount == 7).ToList();
}
private void AddToDigitSequence(List<PhoneNumber> aggregate, PhoneNumber sourceNumber)
{
int lastDigit = sourceNumber.LastDigit;
List<int> nextDigits = _moveMatrix.ReachableFrom(lastDigit);
foreach (int nextDigit in nextDigits)
{
PhoneNumber newNumber = sourceNumber.Clone();
if (newNumber.TryAdd(nextDigit))
{
aggregate.Add(newNumber);
AddToDigitSequence(aggregate, newNumber);
}
}
return;
}
public PhoneNumber Clone()
{
var clone = new PhoneNumber();
clone.digitsThatMakeUpThisPhoneNumber.AddRange(digitsThatMakeUpThisPhoneNumber);
return clone;
}
