dsl-sample.rb

dsl-sample.rb

def simpleblock(&block)
  block.call
end

class Sandbox # こういうときは BasicObject 継承がいいと思うけど説明の都合でこのまま
end

def sandbox(&block)
  Sandbox.new.instance_eval(&block)
end

def foo
  'main'
end

simpleblock do
  def foo
    'simple'
  end

  p foo                     #=> "simple"
  p self                    #=> main
  p self.method(:foo)       #=> #<Method: Object#foo() hoge.rb:17>
end

sandbox do
  def foo
    'foo'
  end

  p foo                     #=> "foo"
  p self                    #=> #<Sandbox:0x00007f9bec0a7000>
  p self.method(:foo)       #=> #<Sandbox:0x00007f9bec0a7000>.foo() hoge.rb:27>
end

p foo #=> "simple"