Sha256: e071302434db451f7568016b17b122f5ece0706d28aa52d44c7e00a498f82480
Contents?: true
Size: 1001 Bytes
Versions: 115
Compression:
Stored size: 1001 Bytes
Contents
using System.Collections.Generic;
using System.Linq;
public class Atbash
{
private const string PLAIN = "abcdefghijklmnopqrstuvwxyz";
private const string CIPHER = "zyxwvutsrqponmlkjihgfedcba";
public static string Encode(string value)
{
var encoded = string.Concat(StripInvalidCharacters(value).ToLower().Select(ApplyCipher));
return SplitIntoFiveLetterWords(encoded);
}
private static string StripInvalidCharacters(string value)
{
return string.Concat(value.Where(char.IsLetterOrDigit));
}
private static char ApplyCipher(char value)
{
var idx = PLAIN.IndexOf(value);
return idx >= 0 ? CIPHER[idx] : value;
}
private static string SplitIntoFiveLetterWords(string value)
{
var words = new List<string>();
for (int i = 0; i < value.Length; i += 5)
words.Add(i + 5 <= value.Length ? value.Substring(i, 5) : value.Substring(i));
return string.Join(" ", words);
}
}
Version data entries
115 entries across 115 versions & 1 rubygems