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: quickpath.rb
    path of file: ./repos/powerstation/powerstation/lib/compiled-jruby/lib/ruby/stdlib/rexml
    
    the code of the file until where you have to start completion: require 'rexml/functions'
require 'rexml/xmltokens'

module REXML
  class QuickPath
    include Functions
    include XMLTokens

    # A base Hash object to be used when initializing a
    # default empty namespaces set.
   
    
    def QuickPath::axe( elements, axe_name, rest )
      matches = []
      matches = filter( elements.dup, rest ) if axe_name =~ /-or-self$/u
      case axe_name
      when /^descendant/u
        elements.each do |element|
          matches |= filter( element.to_a, "descendant-or-self::#{rest}" ) if element.kind_of? Element
        end
      when /^ancestor/u
        elements.each do |element|
          while element.parent
            matches << element.parent
            element = element.parent
          end
        end