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: config_rule.rb
    path of file: ./repos/jets/lib/jets/cfn/resource/config
    
    the code of the file until where you have to start completion: module Jets::Cfn::
    
    def namespace
      namespace = nil
      klass = @app_class.constantize
      while klass != Jets::Lambda::Functions
        namespace = klass.rule_namespace
        break if namespace or namespace == false
        klass = klass.superclass
      end