使用 Scala 工具箱是否可以定义一个案例 class 并稍后将其用于评估代码？

Question

I would like to give the case class definition to the Toolbox and be able to use them later when I do the eval. The Toolbox should be able to know the definitions of the case classes.

For example, I am able to define a case class named Authentication with args email

      import scala.reflect.runtime._
      import scala.reflect.runtime.universe._
      import scala.tools.reflect.ToolBox
      val cm = universe.runtimeMirror(getClass.getClassLoader)
      val toolBox = cm.mkToolBox()
      val myClass: ClassDef = q"case class Authentication(email: String)".asInstanceOf[ClassDef]
      val definedClass  = toolBox.define(myClass)
      println(definedClass)

It prints class Authentication Then I would like to recall it into my Eval expression and match it

  val myCode =
    q""" def myFunction(x:Any){
       x match{
        case Authentication(param) => println("Auth received!")
        }
       }"""

  toolBox.eval(myCode)

But it tells me, Authentication was not found. Any idea of how to accomplish it?

Answer 1

Since .apply and .unapply are methods of companion object, you missed .companion similarly to Scala reflection: how do I define a case class at runtime and then reference to it?

Try

val myCode =
  q"""
    def myFunction(x: Any) = {
      x match{
        case ${definedClass.companion}(param) => println("Auth received!")
      }
    }

    myFunction(${definedClass.companion}("111@aaa"))
  """

toolBox.eval(myCode) // toolBox.eval(myCode)