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■[Ruby][clone]深いコピーの作成(3)

深いコピーの作成(2) - pegacornの日記

作業用のインスタンス変数が衝突する可能性があった問題を解決した。

clone.rb

#!ruby

class Object
  def deep_clone
    _deep_clone({})
  end

  protected
  def _deep_clone(cloning_map)
    return cloning_map[self] if cloning_map.key? self
    cloning_obj = clone
    cloning_map[self] = cloning_obj
    cloning_obj.instance_variables.each do |var|
      val = cloning_obj.instance_variable_get(var)
      begin
        val = val._deep_clone(cloning_map)
      rescue TypeError
        next
      end
      cloning_obj.instance_variable_set(var, val)
    end
    cloning_map.delete(self)
  end
end

class Array
  protected
  def _deep_clone(cloning_map)
    return cloning_map[self] if cloning_map.key? self
    cloning_obj = super
    cloning_map[self] = cloning_obj
    cloning_obj.map! do |val|
      begin
        val = val._deep_clone(cloning_map)
      rescue TypeError
        #
      end
      val
    end
    cloning_map.delete(self)
  end
end

class Hash
  protected
  def _deep_clone(cloning_map)
    return cloning_map[self] if cloning_map.key? self
    cloning_obj = super
    cloning_map[self] = cloning_obj
    pairs = cloning_obj.to_a
    cloning_obj.clear
    pairs.each do |pair|
      pair.map! do |val|
        begin
          val = val._deep_clone(cloning_map)
        rescue TypeError
          #
        end
        val
      end
      cloning_obj[pair[0]] = pair[1]
    end
    cloning_map.delete(self)
  end
end

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