org.wartremover.warts.SizeIs.scala Maven / Gradle / Ivy
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package org.wartremover
package warts
import scala.reflect.NameTransformer
object SizeIs extends WartTraverser {
override def apply(u: WartUniverse): u.Traverser = {
import u.universe._
object Method {
private[this] val values = Seq(
"<",
"<=",
"==",
"!=",
">",
">="
).map(NameTransformer.encode).map(TermName.apply(_))
def unapply(t: Name): Boolean = values.contains(t)
}
object IsScalaCollection {
def unapply(t: Tree): Boolean = t.tpe <:< typeOf[collection.Iterable[Any]]
}
new Traverser {
override def traverse(tree: Tree): Unit = {
tree match {
case t if hasWartAnnotation(u)(t) =>
case Apply(
Select(Select(IsScalaCollection(), a @ (TermName("size") | TermName("length"))), Method()),
List(value)
) if !isSynthetic(u)(tree) && (value.tpe weak_<:< typeOf[Int]) =>
error(u)(tree.pos, s"Maybe you can use `${a.decodedName}Is` instead of `${a.decodedName}`")
case _ =>
super.traverse(tree)
}
}
}
}
}