Solution to Puzzlenode.com #4 Robots vs Lasers

gistfile1.rb

class RobotGuidanceSystem
  attr_accessor :schematics

  def initialize(input_file)
    self.schematics = []
    f = File.open(input_file) if File.exists? input_file
    parse_schematics f.read if f
  end

  def run
    schematics.each do |s|
      puts run_conveyer s
    end
  end

  def run_conveyer conveyer
    if(get_damage(conveyer.map{|x| x.reverse}) <= get_damage(conveyer))
      return "GO WEST"
    end
    return "GO EAST"
  end

  def get_damage conveyer
    damage = 0
    clicks = 0
    start_position = conveyer[1].index 'X'
    conveyer[1].slice(start_position,conveyer[1].count).each_with_index do |p,idx|
      pos = idx + start_position
      if conveyer[0][pos] == '|' and clicks.even?
        damage += 1
      elsif conveyer[2][pos] == '|' and clicks.odd?
        damage += 1
      end
      clicks += 1
    end
    return damage
  end

  def parse_schematics data
    i = 1
    conveyer = []
    data.each_line do |l|
      row = l.strip.split("")
      conveyer.push row unless row.empty?
      if conveyer.count == 3
        self.schematics.push conveyer
        conveyer = []
      end
    end
  end
end