class Chronic::Repeater

def self.scan_for_units(token)
  scanner = {/^years?$/ => :year,
             /^seasons?$/ => :season,
             /^months?$/ => :month,
             /^fortnights?$/ => :fortnight,
             /^weeks?$/ => :week,
             /^weekends?$/ => :weekend,
             /^(week|business)days?$/ => :weekday,
             /^days?$/ => :day,
             /^hours?$/ => :hour,
             /^minutes?$/ => :minute,
             /^seconds?$/ => :second}
  scanner.keys.each do |scanner_item|
    if scanner_item =~ token.word
      klass_name = 'Chronic::Repeater' + scanner[scanner_item].to_s.capitalize
      klass = eval(klass_name)
      return klass.new(scanner[scanner_item])
    end
  end
  return nil
end