class Rufus::CronLine

def parse_weekdays(item)
  return nil if item == '*'
  items = item.downcase.split(',')
  weekdays = nil
  monthdays = nil
  items.each do |it|
    if it.match(/#[12345]$/)
      raise ArgumentError.new(
        "ranges are not supported for monthdays (#{it})"
      ) if it.index('-')
      (monthdays ||= []) << it
    else
      WEEKDAYS.each_with_index { |a, i| it.gsub!(/#{a}/, i.to_s) }
      its = it.index('-') ? parse_range(it, 0, 7) : [ Integer(it) ]
      its = its.collect { |i| i == 7 ? 0 : i }
      (weekdays ||= []).concat(its)
    end
  end
  weekdays = weekdays.uniq if weekdays
  [ weekdays, monthdays ]
end