James Gray
1/10/2006 7:15:00 PM
Begin forwarded message:
> From: Patrick Deuster <pdeuster@gmail.com>
> Date: January 9, 2006 10:42:10 AM CST
> To: submission@rubyquiz.com
> Subject: Please Forward: Ruby Quiz Submission
>
> Hello.
> I just found out about Ruby Quiz, and I couldn't resist doing the
> latest task.
> However I don't want to subscripe to the list just yet, so could you
> forward it please?
>
> I hope I have enough time to join the list and do more quizes in
> the future.
>
> Anyway, here's my solution to the current task:
>
> #!/usr/bin/env ruby
>
> class Fixnum
> def d other
> # Raise an error if we have an invalid combination
> raise "Invalid dice" if self < 1 || other < 1
> # Roll the "other"-sided dice "self"-times
> Array.new(self) { rand(other)+1 } .inject { |x,sum| sum += x }
> end
> end
>
> class Dice
> def initialize(str)
> # Global substition of
> # <operator>d to <operator>1d <operator> = /*+-
> # d% to d100
> # dx to d(x) x = integer
> # d to .d
> @str = str.gsub(/[\/\+\-\*]d/) { |match| match[0..0] + "1d" }
> .gsub(/d%/,"d100") .gsub(/(d\s*\d+)/) { |match| "d(" +
> match.delete('d') + ")" } .gsub(/d/,".d")
> #@str should now hold valid ruby code to roll the dice
> end
> def roll
> #just evaluate @str
> eval @str
> end
> end
>
> # Take the arguments, create a new dice and roll it
> d = Dice.new(ARGV[0])
> (ARGV[1] || 1).to_i.times { print "#{d.roll} " }
>
> -------------------------------------
> Patrick Deuster