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scalaVersion := "2.11.5" | |
libraryDependencies ++= Seq( | |
"org.scala-lang" % "scala-reflect" % scalaVersion.value | |
) |
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import scala.language.experimental.macros | |
import scala.reflect.macros.whitebox | |
import scala.annotation.meta.getter | |
object FirstAnnotation { | |
def applyImpl[T: c.WeakTypeTag, Ann: c.WeakTypeTag](c: whitebox.Context): c.Tree = { | |
import c.universe._ | |
val tpe = weakTypeOf[T] | |
val annTpe = weakTypeOf[Ann] | |
val constructor = tpe.decl(termNames.CONSTRUCTOR).asMethod | |
val l = | |
constructor.paramLists.flatten.flatMap { sym => | |
tpe.member(sym.name).annotations.filter(_.tree.tpe =:= annTpe).map(_.tree) | |
} | |
l match { | |
case h :: _ => | |
h | |
case Nil => | |
c.abort(c.enclosingPosition, s"No $annTpe annotation found") | |
} | |
} | |
def apply[T, Ann]: Ann = macro applyImpl[T, Ann] | |
} | |
@getter case class TestAnnotation(value: String) extends annotation.StaticAnnotation | |
case class Test( | |
@TestAnnotation("test") member: String | |
) |
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// Launch sbt console, and enter the following | |
FirstAnnotation[Test, TestAnnotation] |
Hi,
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To decode
output.xz.base64
, doOutput obtained with
echo "FirstAnnotation[Test, TestAnnotation]" | sbt console > output 2>&1
withFirstAnnotation.scala
andbuild.sbt
in the current directory.