gistfile1

require 'logger'

class ParseError < RuntimeError; end

class Parser
  def initializee
    @logger = Logger.new(STDOUT)
    $rules = Hash.new
    @start = nil
    @tokens = ["+", "-", "*", "/"]
    @input = Array.new
    @output = Array.new
  end
    
  def tokens(str)
    @input = str
    @input.strip.to_a
    until @input.empty?
      #raise ParseError,  "unable to lex #{@input}" unless @input.match(/\w+/)
      @output << @input[/\+|\-|\/|\*/]
      @input.gsub!(/\+|\-|\/|\*/, '')
      @output << @input[/\d+/] 
      @input.gsub!(/\d+/, '')
    end
    puts @output
  end
end

parser = Parser.new
parser.tokens('1 + 2')