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package mill.moduledefs
import scala.collection.mutable
import scala.reflect.macros.blackbox.Context
trait Cacher{
private[this] lazy val cacherLazyMap = mutable.Map.empty[sourcecode.Enclosing, Any]
protected[this] def cachedTarget[T](t: => T)
(implicit c: sourcecode.Enclosing): T = synchronized{
cacherLazyMap.getOrElseUpdate(c, t).asInstanceOf[T]
}
}
object Cacher{
def impl0[T: c.WeakTypeTag](c: Context)
(t: c.Expr[T]): c.Expr[T] = {
c.Expr[T](wrapCached[T](c)(t.tree))
}
def wrapCached[R: c.WeakTypeTag](c: Context)(t: c.Tree) = {
import c.universe._
val owner = c.internal.enclosingOwner
val ownerIsCacherClass =
owner.owner.isClass &&
owner.owner.asClass.baseClasses.exists(_.fullName == "mill.moduledefs.Cacher")
if (ownerIsCacherClass && owner.isMethod) q"this.cachedTarget[${weakTypeTag[R]}]($t)"
else c.abort(
c.enclosingPosition,
"T{} members must be defs defined in a Cacher class/trait/object body"
)
}
}
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