如何在Scala3运行时编译和执行scala代码？

Question

我想在运行时使用 Scala3 编译和执行 Scala 代码作为字符串。 例如在 Scala 2 中我会使用反射

import scala.reflect.runtime.universe as ru
import scala.tools.reflect.ToolBox
val scalaCode = q"""println("Hello world!")"""
val evalMirror = ru.runtimeMirror(this.getClass.getClassLoader)
val toolBox = evalMirror.mkToolBox()
toolBox.eval(scalaCode) //Hello world!

如果我尝试在 Scala3 中运行此代码，我会得到

Scala 2 macro cannot be used in Dotty. See https://dotty.epfl.ch/docs/reference/dropped-features/macros.html
To turn this error into a warning, pass -Xignore-scala2-macros to the compiler

如何在 Scala3 中翻译此代码？

Answer 1

根据 Odersky 教授的评论，您搜索的功能似乎已被故意删除。

Answer 2

例如，您可以使用Ammonite

ammonite.Main(verboseOutput = false).runCode("""println("Hello world!")""")
// Hello world!

build.sbt

lazy val root = project
  .in(file("."))
  .settings(
    name := "scala3demo",
    version := "0.1.0-SNAPSHOT",
    scalaVersion := "3.1.3",
    libraryDependencies ++= Seq(
      "com.lihaoyi" % "ammonite" % "2.5.4-22-4a9e6989" cross CrossVersion.full,
    ),
    excludeDependencies ++= Seq(
      ExclusionRule("com.lihaoyi", "sourcecode_2.13"),
      ExclusionRule("com.lihaoyi", "fansi_2.13"),
    ),
  )