class Addressable::URI

def self.normalize_path(path)
  # Section 5.2.4 of RFC 3986
  return if path.nil?
  normalized_path = path.dup
  loop do
    mod ||= normalized_path.gsub!(RULE_2A, SLASH)
    pair = normalized_path.match(RULE_2B_2C)
    if pair
      parent  = pair[1]
      current = pair[2]
    else
      parent  = nil
      current = nil
    end
    regexp = "/#{Regexp.escape(parent.to_s)}/\\.\\./|"
    regexp += "(/#{Regexp.escape(current.to_s)}/\\.\\.$)"
    if pair && ((parent != SELF_REF && parent != PARENT) ||
        (current != SELF_REF && current != PARENT))
      mod ||= normalized_path.gsub!(Regexp.new(regexp), SLASH)
    end
    mod ||= normalized_path.gsub!(RULE_2D, EMPTY_STR)
    # Non-standard, removes prefixed dotted segments from path.
    mod ||= normalized_path.gsub!(RULE_PREFIXED_PARENT, SLASH)
    break if mod.nil?
  end
  normalized_path
end