org.wartremover.warts.GetGetOrElse.scala Maven / Gradle / Ivy
package org.wartremover
package warts
object GetGetOrElse extends WartTraverser {
def apply(u: WartUniverse): u.Traverser = {
import u.universe._
val map = rootMirror.staticClass("scala.collection.Map").toTypeConstructor
new u.Traverser {
override def traverse(tree: Tree): Unit = {
tree match {
case _ if hasWartAnnotation(u)(tree) =>
case Apply(
TypeApply(
Select(
Apply(Select(left, TermName("get")), _ :: Nil),
TermName("getOrElse")
),
_ :: Nil
),
_ :: Nil
) if left.tpe.typeConstructor <:< map =>
error(u)(tree.pos, "you can use Map#getOrElse(key, default) instead of get(key).getOrElse(default)")
case _ =>
super.traverse(tree)
}
}
}
}
}