Please Forward: Ruby Quiz Submission

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From: Karl Czisch <karl.czisch@gmail.com>
Date: August 26, 2006 3:14:41 PM CDT
To: submission@rubyquiz.com
Subject: Please Forward: Ruby Quiz Submission

Quiz #92: DayRange

class DayRange
  @@days = {'Mon' => 1, 'Tue' => 2, 'Wed' => 3, 'Thu' => 4, 'Fri' => 5,
'Sat' => 6, 'Sun' => 7}
  
  def initialize(*input)
    @numbers = Array.new
    
    input.each do |arg|
      num = 0
      if arg.kind_of?(Numeric)
        num = arg
      elsif arg.kind_of?(String)
        num = @@days[arg[0..2]]
      end
      raise ArgumentError, "Wrong parameters" if num == nil or num < 1 or
num > 7
      @numbers << num
    end
  end

  def getNextRange
    left = right = nil
    @numbers.sort.each do |num|
      if left == nil
        left = right = num
      elsif num - right <= 1
        right = num
      else
        yield left, right
        left = right = num
      end
    end
    yield left, right if left
  end
  
  def to_s
    days_inv = @@days.invert
    s = ""
    getNextRange do |from, to|
      s << ', ' unless s.empty?
      s << days_inv[from]
      if to > from
        s << (to - from > 1 ? "-" : ", ")
        s << days_inv[to]
      end
    end
    s
  end
end

puts DayRange.new(1,2,3,4,5,6,7)
puts DayRange.new(1,2,3,6,7)
puts DayRange.new(1,3,4,5,6)
puts DayRange.new(2,3,4,6,7)
puts DayRange.new(1,3,4,6,7)
puts DayRange.new(7)
puts DayRange.new(1,7)
puts DayRange.new(1,8)

···

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