You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: source.rb
    path of file: ./repos/rouge/lib/rouge/guessers
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Rouge
  module Guessers
    class Source < Guesser
      include Util

      attr_reader :source
      def initialize(source)
        @source = source
      end

      def filter(lexers)
        # don't bother reading the input if
        # we've al
    
      def filter(lexers)
        # don't bother reading the input if
        # we've already filtered to 1
        return lexers if lexers.size == 1

        source_text = get_source(@source)

        Lexer.assert_utf8!(source_text)

        source_text = TextAnalyzer.new(source_text)

        collect_best(lexers) do |lexer|
          next unless lexer.detectable?
          lexer.detect?(source_text) ? 1 : nil
        end
      end
    end