Scala example source code file (package.scala)

This example Scala source code file (package.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

apply, list, macros, select

The package.scala Scala example source code

package scala
package reflect

/** Entry points into runtime reflection.
 *  See [[scala.reflect.api.package the overview page]] for details on how to use them.
 */
package object runtime {

  /** The entry point into Scala runtime reflection.
   *
   * To use Scala runtime reflection, simply use or import `scala.reflect.runtime.universe._`
   *
   * See [[scala.reflect.api.Universe]] or the
   * [[http://docs.scala-lang.org/overviews/reflection/environment-universes-mirrors.html Reflection Guide: Universes]]
   * for more details.
   */
  lazy val universe: api.JavaUniverse = new runtime.JavaUniverse

  /** The runtime reflection mirror that corresponds to the current lexical context.
   *  It's typically equivalent to `universe.runtimeMirror(getClass.getClassLoader)` invoked at the call site.
   */
  // implementation hardwired to the `currentMirror` method below
  // using the mechanism implemented in `scala.tools.reflect.FastTrack`
  def currentMirror: universe.Mirror = macro ???
}

package runtime {
  private[scala] object Macros {
    def currentMirror(c: scala.reflect.macros.blackbox.Context): c.Expr[universe.Mirror] = {
      import c.universe._
      val runtimeClass = c.reifyEnclosingRuntimeClass
      if (runtimeClass.isEmpty) c.abort(c.enclosingPosition, "call site does not have an enclosing class")
      val runtimeUniverse = Select(Select(Select(Ident(newTermName("scala")), newTermName("reflect")), newTermName("runtime")), newTermName("universe"))
      val currentMirror = Apply(Select(runtimeUniverse, newTermName("runtimeMirror")), List(Select(runtimeClass, newTermName("getClassLoader"))))
      c.Expr[Nothing](currentMirror)(c.WeakTypeTag.Nothing)
    }
  }
}