Google for Work Riddles

00-Google-for-Work-Riddles

#
# Google for Work riddles in follow Google+ posts
#
https://plus.google.com/u/0/+GoogleforWork/posts/iGqi6N9dwY3
https://plus.google.com/u/0/+GoogleforWork/posts/3uyrWjgz9cr
https://plus.google.com/u/0/+GoogleforWork/posts/6Z8LKYhJqWd

01-Caesar-Crypt.rb

class CaesarCrypt
  attr_accessor :offset

  def initialize(offset)
    @offset = offset
    @alphabet = ('a'..'z').to_a
  end

  def decrypt(st)
    work(st,-@offset)
  end

  def encrypt(st)
    work(st,@offset)
  end

  def work(st, off)
    sol = Array.new
    st.split(//).each {|ch|
      sc = (@alphabet.include?(ch.downcase)) ?
            @alphabet.rotate(off)[@alphabet.index(ch.downcase)] :
            ch
      sol.push((ch.eql?(ch.upcase)) ? sc.upcase : sc)
    }
    return sol.join("")
  end
end

02-Morse-Code.rb

class MorseCode
  def initialize
    @char = ('A'..'Z').to_a + (0..9).to_a + ['.', ',', ':', '?', '\'', '-', '/', '(', '"', '@', '=']
    @morse = [
      '.-',
      '-...',
      '-.-.',
      '-..',
      '.',
      '..-.',
      '--.',
      '....',
      '..',
      '.---',
      '-.-',
      '.-..',
      '--',
      '-.',
      '---',
      '.--.',
      '--.-',
      '.-.',
      '...',
      '-',
      '..-',
      '...-',
      '.--',
      '-..-',
      '-.--',
      '--..',
      '-----',
      '.----',
      '..---',
      '...--',
      '....-',
      '.....',
      '-....',
      '--...',
      '---..',
      '----.',
      '.-.-.-',
      '--..--',
      '---...',
      '..--..',
      '.----.',
      '-....-',
      '-..-.',
      '-.--.-',
      '.-..-.',
      '.--.-.',
      '-...-']
  end

  def encode(c)
    sol = Array.new
    c.split(//).each {|ch|
      sol.push(@morse[@char.index(ch)])
    }
    return sol.join(" ")
  end

  def decode(c)
    sol = Array.new
    c.split(/\s+/).each {|ch|
      sol.push(@char[@morse.index(ch)])
    }
    return sol.join("")
  end
end

11-Riddle-one.rb

#
# First riddle (https://plus.google.com/u/0/+GoogleforWork/posts/iGqi6N9dwY3)
#
r = "Wuhdw brxu sdvvzrug olnh brxu wrrwkeuxvk. Grq'w ohw dqbergb hovh xvh lw, dqg jhw d qhz rqh hyhub vla prqwkv. Foliirug Vwroo"
puts "Riddle 1: #{r}"
puts "    " + CaesarCrypt.new(3).decrypt(r)

12-Riddle-two.rb

#
# Second riddle (https://plus.google.com/u/0/+GoogleforWork/posts/3uyrWjgz9cr)
#
r = "bddpvout ejggfsfou gps qbttxpse b sfvtf opu Ep"
# (0..26).to_a.each {|o|
#   puts "#{o} -> " + CaesarCrypt.new(o).decrypt(r).split(/\s/).reverse.join(" ")
# }
puts "Riddle 2: #{r}"
puts "    " + CaesarCrypt.new(1).decrypt(r).split(/\s/).reverse.join(" ")

13-Riddle-three.rb

#
# Third riddle (https://plus.google.com/u/0/+GoogleforWork/posts/6Z8LKYhJqWd)
#
r = "-.- . -.-- ... . -.-. ..- .-. .. - -.-- .- ..- ... . .- -. -.. .- ..- - .... . -. - .. -.-. .- - .. --- -. ... - . .--. - .-- --- .- -.-. - .. ...- .- - ."
puts "Riddle 3: #{r}"
puts "    " + MorseCode.new().decode(r)
# puts "    " + MorseCode.new().encode(MorseCode.new().decode(r))