wartremover.warts.ToString.scala Maven / Gradle / Ivy
package org.wartremover
package warts
import reflect.NameTransformer
object ToString extends WartTraverser {
def apply(u: WartUniverse): u.Traverser = {
import u.universe._
val ToString: TermName = NameTransformer.encode("toString")
def notOverridden(t: Type): Boolean = {
val toString = t.member(ToString)
!isPrimitive(u)(t) && !(t <:< typeOf[String]) &&
(toString.fullName == "scala.Any.toString" ||
toString.fullName == "scala.AnyRef.toString" ||
toString.fullName == "java.lang.Object.toString" ||
toString.isSynthetic)
}
new Traverser {
override def traverse(tree: Tree) = {
tree match {
// Ignore trees marked by SuppressWarnings
case t if hasWartAnnotation(u)(t) =>
case Apply(Select(lhs, ToString), _) if notOverridden(lhs.tpe) =>
error(u)(tree.pos, s"${lhs.tpe.baseClasses.head} does not override toString and automatic toString is disabled")
case _ => super.traverse(tree)
}
}
}
}
}