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: report.rb
    path of file: ./repos/brakeman/lib/brakeman
    
    the code of the file until where you have to start completion: require 'brakeman/report/report_base'

#Generates a report based on the Tracker and the results of
#Tracker#run_checks. Be sure to +run_checks+ before generatin
    
  def format format
    reporter = case format
    when :to_codeclimate
      require_report 'codeclimate'
      Brakeman::Report::CodeClimate
    when :to_csv
      require_report 'csv'
      Brakeman::Report::CSV
    when :to_html
      require_report 'html'
      Brakeman::Report::HTML
    when :to_json
      return self.to_json
    when :to_tabs
      require_report 'tabs'
      Brakeman::Report::Tabs
    when :to_hash
      require_report 'hash'
      Brakeman::Report::Hash
    when :to_markdown
      return self.to_markdown
    when :to_plain, :to_text, :to_s
      return self.to_plain
    when :to_table
      return self.to_table
    when :to_pdf
      raise "PDF output is not yet supported."
    when :to_junit
      require_report 'junit'
      Brakeman::Report::JUnit
    when :to_sarif
      return self.to_sarif
    when :to_sonar
      require_report 'sonar'
      Brakeman::Report::Sonar
    when :to_github
      require_report 'github'
      Brakeman::Report::Github
    else
      raise "Invalid format: #{format}. Should be one of #{VALID_FORMATS.inspect}"
    end