#author linxu#decrypt the message of cipher.txt

module RubyTrain

  SPLIT_KEY = ":"  class Decoder    def initialize(path)      = path      @code_table = Hash.new      get_code_table    end

    attr_reader :path

    def get_code_table

      begin        file = File.new(, "r")        while (line = file.gets)          value,key = line.strip().split(SPLIT_KEY)          @code_table.store(key, value)        end        file.close      rescue => err        raise err      end    end

    def decode(encrypted_message)

      decrypted_message = String.new      encrypted_message.each_char{|e| decrypted_message << @code_table.fetch(e,e)}      return decrypted_message    end   endend

def get_cipher_message(path)

  cipher_message = String.new  begin    file = File.new(path, "r")    while (line = file.gets)      cipher_message << line    end    file.close  rescue => err    raise err  end  return cipher_messageend

coder = RubyTrain::Decoder.new './code_table.txt'

puts coder.decode 'b1EEA V3Pz!' # Hello Ruby!puts coder.decode(get_cipher_message './cipher.txt')