Morse code bitstream

helper.rb

def bitstream_to_text(bitstream)
  bitstream.join.gsub('111', '-').gsub('1', '.').gsub('0',' ')
end

morse.rb

MORSE_ALPHABET = Hash.new([]).merge!({
  " "=>[0],
  "A"=>[1, 0, 1, 1, 1],
  "B"=>[1, 1, 1, 0, 1, 0, 1, 0, 1],
  "C"=>[1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1],
  "D"=>[1, 1, 1, 0, 1, 0, 1],
  "E"=>[1],
  "F"=>[1, 0, 1, 0, 1, 1, 1, 0, 1],
  "G"=>[1, 1, 1, 0, 1, 1, 1, 0, 1],
  "H"=>[1, 0, 1, 0, 1, 0, 1],
  "I"=>[1, 0, 1],
  "J"=>[1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1],
  "K"=>[1, 1, 1, 0, 1, 0, 1, 1, 1],
  "L"=>[1, 0, 1, 1, 1, 0, 1, 0, 1],
  "M"=>[1, 1, 1, 0, 1, 1, 1],
  "N"=>[1, 1, 1, 0, 1],
  "O"=>[1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1],
  "P"=>[1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1],
  "Q"=>[1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1],
  "R"=>[1, 0, 1, 1, 1, 0, 1],
  "S"=>[1, 0, 1, 0, 1],
  "T"=>[1, 1, 1],
  "U"=>[1, 0, 1, 0, 1, 1, 1],
  "V"=>[1, 0, 1, 0, 1, 0, 1, 1, 1],
  "W"=>[1, 0, 1, 1, 1, 0, 1, 1, 1],
  "X"=>[1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1],
  "Y"=>[1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1],
  "Z"=>[1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1],
  "1"=>[1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1],
  "2"=>[1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1],
  "3"=>[1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1],
  "4"=>[1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1],
  "5"=>[1, 0, 1, 0, 1, 0, 1, 0, 1],
  "6"=>[1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1],
  "7"=>[1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1],
  "8"=>[1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1],
  "9"=>[1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1],
  "0"=>[1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1],
  "/"=>[1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1]
})
    
def calculate_bitstream(message)
  bits = []
  message.upcase.each_char do |letter|
    bits += MORSE_ALPHABET[letter]
    bits += [0, 0, 0]
  end
  bits.pop 3
  bits
end