scala - 在 Scala 3 宏中获取封闭模块

Question

如何获取宏调用的封闭模块。

package foo.bar
class MyClass:
  val macroReturnValue = SomeMacro.macroCall("someExpression")
end MyClass

macroReturnValue应该包含例如"foo.bar.MyClass"

标签： scalamacrosscala-macrosscala-3

Answer 1

尝试

import scala.quoted.*

object SomeMacro:
  inline def macroCall(s: String): String = ${macroCallImpl('s)}

  def macroCallImpl(s: Expr[String])(using Quotes): Expr[String] =
    import quotes.reflect.*
    def enclosingClass(symb: Symbol): Symbol = 
      if symb.isClassDef then symb else enclosingClass(symb.owner)
    val name = enclosingClass(Symbol.spliceOwner).fullName
    Literal(StringConstant(name)).asExprOf[String]