隐藏理解

Question

我在DSL中使用monad和comprenhension工作.由于我的客户端不知道Scala我试图隐藏这么多语法.到目前为止我有这个DSL

  (for {
    * <- Given("A message", message(path = "esb", version = TWO))
    * <- And("With version 2.0", *)
    * <- And("I make esb return 300", *)
    * <- When("I make a request", *)
    * <- Then("The return code is 500", *)
  } yield ()).foldMap(scenario)

这比使它们实现scalaTest要好得多,但这仍然可以吓到它们.

有没有办法隐藏使用隐式u其他机制的for/yield而只是离开DSL？

问候.

Answer 1

它必须是monad吗？

这样的事情可能更容易使用:

 case class Given(
    what: String, 
    ands: Seq[String] = Nil,
    when: Option[String] = None, 
    then: Option[String] = None
 ) {
    def And(s: String) = copy(ands = ands :+ s)
    def When(s: String) = copy(when = Some(s))
    def Then(s: String) = copy(then = Some(s)) 
    def Run(scenario: Scenario) = ???
 }

你可以写点东西

 Given("foo") And "bar" And "bat" When "baz" Then "bam" Run scenario