class Chronic::Repeater

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