Just a tiny brainfuck implemetation in ruby

bf.rb

class BrainFuck
  def initialize code
    @code = code.gsub(/[^<>\[\]\+\-\.,]+/, "")
  end

  def run code
    code  = @code.split ""
    tape  = []

    c = t = 0

    while c != code.length
      tape[t] ||= 0

      case code[c]
        when "<" then t-=1
        when ">" then t+=1
        when "+" then tape[t]+=1
        when "-" then tape[t]-=1
        when "["
          if tape[t] == 0
            c += 1 while code[c] != "]" && c != code.length
          end
        when "]"
          if tape[t] != 0
            c -= 1 while code[c] != "[" && c != 0
          end
        when "." then print tape[t].chr
        when "," then tape[t] = STDIN.getc.ord
      end

      c+=1
    end

  end
end

BrainFuck.new(DATA.read).run if $0 == __FILE__


__END__

+++++ +++++      
[                
    >,----- ----- ----- ----- ----- ----- --.         
    < -       
]