From: "Ball, Donald A Jr (Library)" <donald.ball@...>
Date: 2007-04-23T04:01:39+09:00
Subject: Re: [QUIZ] Morse Code (#121)

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Below is my second solution.

http://pastie.caboo.se/55742

- donald

# Ruby Quiz 121
# Donald A. Ball Jr.
# Version 1.1
class String
  def split_at(index)
    [slice(0, index), slice(index, length)]
  end
end

class Morse

  CODES =3D {
    :A =3D> '.-',
    :B =3D> '-...',
    :C =3D> '-.-.',
    :D =3D> '-..',
    :E =3D> '.',
    :F =3D> '..-.',
    :G =3D> '--.',
    :H =3D> '....',
    :I =3D> '..',
    :J =3D> '.---',
    :K =3D> '-.-',
    :L =3D> '.-..',
    :M =3D> '--',
    :N =3D> '-.',
    :O =3D> '---',
    :P =3D> '.--.',
    :Q =3D> '--.-',
    :R =3D> '.-.',
    :S =3D> '...',
    :T =3D> '-',
    :U =3D> '..-',
    :V =3D> '...-',
    :W =3D> '.--',
    :X =3D> '-..-',
    :Y =3D> '-.--',
    :Z =3D> '--..'
  }

  def self.decipher(cipher)
    CODES.each_pair do |letter, code|
      prefix, suffix =3D cipher.split_at(code.length)
      next unless prefix =3D=3D code
      if suffix =3D=3D ''
        yield letter.to_s
      else
        decipher(suffix) {|result| yield letter.to_s << result }
      end
    end
  end

end

Morse.decipher(ARGV[0]) {|word| puts word}

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