codewars reverse or rotate

revrot.rb

#!/usr/bin/env ruby

def revrot(str, sz)
  return "" if str.empty? or sz.zero?

  str.chars.each_slice(sz).______ do |chunk|
    chunk.size == sz
  end.___ { |ch| ch.___(&:to_i) }.___ do |chunk|
    if chunk.___ { |int| (int ** 3) }.___.modulo(2).zero?
      chunk.reverse
    else
      chunk.rotate(1)
    end
  end.____
end