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[py2rb] type クラスの動的定義

Last updated at Posted at 2022-01-28

はじめに

移植やってます。
( from python 3.7 to ruby 2.7 )

type (Python)

    @classmethod
    def _make_chain(cls, sequence_maker):
        if isinstance(sequence_maker, type):
            tp = type('%sChain' % sequence_maker.__class__.__name__, (cls,), {
                'sequence_maker': sequence_maker
            })
        else:
            tp = type('FunctionChain', (cls,), {
                'sequence_maker': staticmethod(sequence_maker)
            })
        return tp

独習Python 516p

ここでのtypeはメソッドの雛型を利用して、クラスを動的に定義しています。

Class.new (Ruby)

class MC
  def self._make_chain(sequence_maker)
    if sequence_maker.instance_of?(Class)
      tp = sequence_maker.class.to_s.concat('Chain')
      tp = Class.new(self) {
        def sequence_maker
          puts 'Instance Method'
        end
        define_method(sequence_maker.to_s, instance_method(:sequence_maker))
      }
    else
      functionChain = Class.new(self)
      functionChain.define_singleton_method(sequence_maker) do
        puts 'Class Method'
      end
      return functionChain
    end
  end
end

MC._make_chain(String).new.String
MC._make_chain('aa').aa

# output
Instance Method
Class Method

Class.new(superclass)でクラスを生成。
インスタンスメソッドは、define_methodで名前を変更。
クラスメソッドは、define_singleton_methodで生成。

やっていることはシンプルですが、ちゃんと動作するか心配。

メモ

  • Python の type を学習した
  • 百里を行く者は九十里を半ばとす
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