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: classifier.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/github-linguist-4.8.18/lib/linguist
    
    the code of the file until where you have to start completion: require 'linguist/tokenizer'

module Linguist
  # Language bayesian classifier.
  class Classifier
    # Public: Use the classifier to detect language of the blob.
    #
    # blob               - An object that quacks like a blob.
    # possible_languages - Array of Language objects
    #
    # Examples
    #
    #   Classifier.call(FileBlob.new("path/to/file"), [
    #     Language["Ruby"], Language["Python"]
    #   ])
    #
    # Returns an Array of Language objects, most probable first.
    def self.call
    
    def self.train!(db, language, data)
      tokens = Tokenizer.tokenize(data)

      db['tokens_total'] ||= 0
      db['languages_total'] ||= 0
      db['tokens'] ||= {}
      db['language_tokens'] ||= {}
      db['languages'] ||= {}

      tokens.each do |token|
        db['tokens'][language] ||= {}
        db['tokens'][language][token] ||= 0
        db['tokens'][language][token] += 1
        db['language_tokens'][language] ||= 0
        db['language_tokens'][language] += 1
        db['tokens_total'] += 1
      end
      db['languages'][language] ||= 0
      db['languages'][language] += 1
      db['languages_total'] += 1

      nil
    end