# File lib/css_parser/parser.rb, line 286
    def rules_by_media_query
      rules_by_media = {}
      @rules.each do |block|
        block[:media_types].each do |mt|
          unless rules_by_media.has_key?(mt)
            rules_by_media[mt] = []
          end
          rules_by_media[mt] << block[:rules]
        end
      end

      rules_by_media
    end