bfr.rb

require 'io/console'
memory = Array.new(30000, 0)
pointer = 0
director = 0
code = open(ARGV[0], "r").read

while director < code.size
  char = code[director]
  case char
  when ">"
    if pointer == 29999
      exit
    end
    pointer += 1
  when "<"
    if pointer == 0
      exit
    end
    pointer -= 1
  when "+"
    memory[pointer] += 1
  when "-"
    memory[pointer] -= 1
  when "."
    print memory[pointer].chr
  when ","
    memory[pointer] = getch.ord
  when "["
    if memory[pointer] == 0
      bracket = 1
      while bracket != 0
        director += 1
        bracket += 1 if code[director] == "["
        bracket -= 1 if code[director] == "]"
      end
    end
  when "]"
    bracket = 1
    while bracket != 0
      director -= 1
      bracket += 1 if code[director] == "]"
      bracket -= 1 if code[director] == "["
    end
    director -= 1
  end
  director += 1
end