Class: ShiftCipher::Caesar

Inherits:

Object

• Object
• ShiftCipher::Caesar

Defined in:

lib/shift_cipher/caesar.rb

Constant Summary

DEFAULT_OFFSET =

0

FIRST_UNICODE_CODEPOINT =

97

LAST_UNICODE_CODEPOINT =

123

Instance Attribute Summary

• #offset ⇒ Object

  Returns the value of attribute offset.

Instance Method Summary

• #decrypt(message) ⇒ Object
• #encrypt(message) ⇒ Object
• #initialize(start = 0) ⇒ Caesar constructor

  A new instance of Caesar.

Constructor Details

#initialize(start = 0) ⇒ Caesar

Returns a new instance of Caesar.

# File 'lib/shift_cipher/caesar.rb', line 10

def initialize(start = 0)
  @offset = calculate_offset(start)
end

Instance Attribute Details

#offset ⇒ Object

Returns the value of attribute offset.

# File 'lib/shift_cipher/caesar.rb', line 8

def offset
  @offset
end

Instance Method Details

#decrypt(message) ⇒ Object

# File 'lib/shift_cipher/caesar.rb', line 18

def decrypt(message)
  shift(message, -offset)
end

#encrypt(message) ⇒ Object

# File 'lib/shift_cipher/caesar.rb', line 14

def encrypt(message)
  shift(message, offset)
end