# File lib/rouge/guesser.rb, line 12
    def self.guess(guessers, lexers)
      original_size = lexers.size

      guessers.each do |g|
        new_lexers = case g
        when Guesser then g.filter(lexers)
        when proc { |x| x.respond_to? :call } then g.call(lexers)
        else raise "bad guesser: #{g}"
        end

        lexers = new_lexers && new_lexers.any? ? new_lexers : lexers
      end

      # if we haven't filtered the input at *all*,
      # then we have no idea what language it is,
      # so we bail and return [].
      lexers.size < original_size ? lexers : []
    end