Ruby submission for Bowling code completion of Gild 2011

bowling.rb

#!/usr/bin/ruby
# X = 88, 0 = 48, 9 = 57, / = 47

File.foreach(ARGV[0]) do |line|
  ret = 0
  prev = 0
  pos = 0
  (line.rstrip << " 0 0").bytes.select{|c| c!=32}.each_cons(3) {
    |c, n, nn| #current, next, nextnext
    if c >=48 && c < 58 #number
      ret += prev = c - 48
      pos += 1 #half increment
    elsif c == 47 #slash
      if n == 88
	ret += 20 - prev
      else
	ret += n - 38 - prev
      end
      pos += 1 #half increment
    else #X
      #print "pos: <#{pos}>"
#      if n == 88 
#	ret += 20
#      elsif nn == 47
#	ret += 20
#      else
#	ret += n - 38
#      end
#      if nn == 88
#	ret += 10
#      elsif nn != 47 #nn is number
#	ret += nn - 48
#      end
      ret += 10
      if n == 88 
	ret += 10
      elsif nn == 47
	ret += 10
      else
	ret += n - 48
      end
      if nn == 88
	ret += 10
      elsif nn == 47 #nn is /
	ret += 0
      else
	ret += nn - 48
      end
      pos += 2 #full increment
    end
    if pos >= 20
      break
    end
  }
  puts ret
end