Class: Cipher

Inherits:
Object
  • Object
show all
Defined in:
lib/cipher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(shift_amount, plaintext) ⇒ Cipher

Returns a new instance of Cipher.



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# File 'lib/cipher.rb', line 4

def initialize(shift_amount, plaintext) 
  @shift_amount = shift_amount
  @plaintext = plaintext
end

Instance Attribute Details

#plaintext ⇒ Object (readonly)

Returns the value of attribute plaintext.



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# File 'lib/cipher.rb', line 2

def plaintext
  @plaintext
end

#shift_amount ⇒ Object (readonly)

Returns the value of attribute shift_amount.



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# File 'lib/cipher.rb', line 2

def shift_amount
  @shift_amount
end

Instance Method Details

#alpha_to_cipher ⇒ Object 



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# File 'lib/cipher.rb', line 28

def alpha_to_cipher
  Hash[alphabet.zip ciphered_alphabet]
end

#alphabet ⇒ Object 



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# File 'lib/cipher.rb', line 9

def alphabet
  ["A", "B", "C", "D",
   "E", "F", "G", "H", 
   "I", "J", "K", "L", 
   "M", "N", "O", "P", 
   "Q", "R", "S", "T", 
   "U", "V", "W", "X", 
   "Y", "Z"]
end

#ciphered_alphabet ⇒ Object 



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# File 'lib/cipher.rb', line 19

def ciphered_alphabet
  append_to_end = alphabet[0..@shift_amount - 1]
  ciphered = alphabet.drop(@shift_amount)
  append_to_end.each do |letter|
    ciphered << letter
  end
  ciphered
end

#encrypt ⇒ Object 



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# File 'lib/cipher.rb', line 32

def encrypt
  split_text = @plaintext.upcase.split("")
  encrypted = ""
  split_text.each do |letter|
    if letter == " "
      encrypted += letter
    elsif !alphabet.include?(letter)
      encrypted += ""
    else
      encrypted_letter = alpha_to_cipher[letter]
      encrypted += encrypted_letter
    end
  end
  encrypted.downcase
end