Pubquiz code

time-pubquiz.rb

require 'date'

class PubQuizDate
  class << self
    def parse(str)
      days = %w{zon maan dins woens donder vrij zater}

      format, pattern = {
        next_week: /\Avolgende week (\w+)dag\Z/,
        after_that: /\Ade (\w+)dag daarna\Z/
      }.find {|fmt, ptrn| str =~ ptrn}
      wday = $~.to_a[1]

      if !format || !days.include?(wday)
        raise ArgumentError, "can't parse that"
      end

      case format
      when :next_week
        now = DateTime.now
        @last_date = now + (7 - now.wday) + days.index(wday)
      when :after_that
        raise RuntimeError, "no previous date set" unless @last_date
        delta = days.index(wday) - @last_date.wday
        delta += 7 if delta < 1
        @last_date += delta
      end
    end
  end
end