Color manipulation - Proof-of-concept Ruby library for color manipulation by building on Sass

rainbow.rb

class Rainbow
  def sass(command)
    @@parser ||= Sass::Script::Parser
    @@env = Sass::Environment.new
    @@parser.parse(command, 0, 0).perform @@env
  end
  def saturation(color, amount) # amount is between -1 and 1
    sass "change-color(#{color}, $saturation: #{100*amount})"
  end
  def lightness(color, amount) # amount is between -1 and 1
    sass "change-color(#{color}, $lightness: #{100*amount})"
  end
  def color(color, options)
    options = options.mash
    opts = []
    opts << "$lightness: #{100 * options.l}" if options.l
    opts << "$saturation: #{100 * options.s}" if options.s
    sass "change-color(#{color}, #{opts.join(',')})"
  end
end