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: date_parser.rb
    path of file: ./repos/phishin/app/services
    
    the code of the file until where you have to start completion: class DateParser
  attr_reader :str, :date_parts

  def initialize(str)
    @str = str
  end

  def call
    return false unless str_matches_short_da
    
  def str_matches_short_date?
    return false unless str =~ %r{\A(\d{1,2})(-|/)(\d{1,2})(-|/)(\d{1,2})\z}
    r = Regexp.last_match
    year = r[5]
    zero = (year.size == 1 ? '0' : '')
    year = (year.to_i > 70 ? "19#{zero}#{year}" : "20#{zero}#{year}")
    @date_parts = [year, r[1], r[3]]
  end