rubocopと共にそそり立つ十字の壁を歩む

背景

rubocopをいれた
bbatsov/rubocop · GitHub

やったこと

「rubyっぽくないところがあるからなおそうね」と言われたので直した
cmdから実行しているがatomから実行できるようにしたい。
なんかうまく動かない。謎。

成果

#
# manage wall and walked cells
#
class World
  attr_accessor :field
  MAX = 100
  def initialize(input)
    n, e, s, w = input
    @field = {}
    s = -s
    w = -w
    s.upto(n) do |y|
      set_wall(0, y)
    end
    w.upto(e) do |x|
      set_wall(x, 0)
    end
  end

  def wall?(x, y)
    key = key_of(x, y)
    @field[key]
  end

  def set_wall(x, y)
    key = key_of(x, y)
    @field[key] = true
  end

  private

  def key_of(x, y)
    half = MAX / 2
    x += half
    y = half - y
    debug if x < 0 || x >= MAX || y < 0 || y >= MAX
    "#{x},#{y}"
  end
end
#
# walking simulator
#
class Person
  attr_reader :point
  VECT = [[0, 1],
          [1, 0],
          [0, -1],
          [-1, 0]]
  DIR = :NESW
  def initialize(w)
    @wall = w
    @point = [1, 1]
    @wall.set_wall(1, 1)
    @front = 1
  end

  def step
    v = VECT[togo_dir]
    nx, ny = add_point(v)
    @wall.set_wall(nx, ny)
    @point = [nx, ny]
  end

  def togo
    DIR[togo_dir]
  end

  private

  def right
    (@front + 1) % 4
  end

  def left
    (@front + 3) % 4
  end

  def try_step(x, y)
    !@wall.wall?(x, y)
  end

  def togo_dir
    v = VECT[right]
    nx, ny = add_point(v)
    if try_step(nx, ny)
      @front = right
      return @front
    end
    v = VECT[@front]
    nx, ny = add_point(v)
    try_step(nx, ny) ? @front : left
  end

  def add_point(v)
    x = @point[0] + v[0]
    y = @point[1] + v[1]
    [x, y]
  end
end

#
# answerer
#
class Solver
  attr_writer :input
  def solve
    arr = @input.split(',')
    arr[3], day = arr[3].split(':')
    arr.map!(&:to_i)
    d = day.to_i

    w = World.new(arr)
    me = Person.new(w)
    d.times do
      me.step
    end
    me.togo
  end
end