static HexCoordinate Parse(string line)
{
Queue <char> tokens = new Queue <char>(line);
HexCoordinate hex = new HexCoordinate(0, 0, 0);
while (tokens.Count > 0)
{
char token = tokens.Dequeue();
switch (token)
{
case 'e':
hex = hex.Add(East);
break;
case 'w':
hex = hex.Add(West);
break;
case 'n':
token = tokens.Dequeue();
hex = hex.Add(token == 'w' ? NorthWest : NorthEast);
break;
case 's':
token = tokens.Dequeue();
hex = hex.Add(token == 'w' ? SouthWest : SouthEast);
break;
default:
throw new FormatException("Invalid hex string");
}
}
return(hex);
}
static IEnumerable <HexCoordinate> Neighbors(this HexCoordinate hex)
{
yield return(hex.Add(East));
yield return(hex.Add(West));
yield return(hex.Add(NorthEast));
yield return(hex.Add(NorthWest));
yield return(hex.Add(SouthEast));
yield return(hex.Add(SouthWest));
}