# File lib/compass/sass_extensions/sprites/sprite_methods.rb, line 86 def uniqueness_hash @uniqueness_hash ||= begin sum = Digest::MD5.new sum << SPRITE_VERSION sum << path images.each do |image| [:relative_file, :height, :width, :repeat, :spacing, :position, :digest].each do |attr| sum << image.send(attr).to_s end end sum.hexdigest[0...10] end @uniqueness_hash end