RosettaCodeData/Task/Caesar-cipher/Nanoquery/caesar-cipher.nanoquery

def caesar_encode(plaintext, shift)
   uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
   lowercase = "abcdefghijklmnopqrstuvwxyz"

   cipher = ""
   for char in plaintext
      if char in uppercase
         cipher += uppercase[uppercase[char] - (26 - shift)]
      else if char in lowercase
         cipher += lowercase[lowercase[char] - (26 - shift)]
      else
         cipher += char
      end
   end

   return cipher
end

def caesar_decode(cipher, shift)
   uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
   lowercase = "abcdefghijklmnopqrstuvwxyz"

   plaintext = ""
   for char in cipher
      if char in uppercase
         plaintext += uppercase[uppercase[char] - shift]
      else if char in lowercase
         plaintext += lowercase[lowercase[char] - shift]
      else
         plaintext += char
      end
   end

   return plaintext
end