com.sksamuel.scapegoat.inspections.equality.ComparisonWithSelf.scala Maven / Gradle / Ivy

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package com.sksamuel.scapegoat.inspections.equality

import com.sksamuel.scapegoat._

/**
 * @author Stephen Samuel
 */
class ComparisonWithSelf
    extends Inspection(
      text = "Comparision with self",
      defaultLevel = Levels.Warning,
      description = "Checks for equality checks with itself.",
      explanation = "Comparison with self will always yield true."
    ) {

  def inspector(context: InspectionContext): Inspector =
    new Inspector(context) {
      override def postTyperTraverser =
        new context.Traverser {

          import context.global._

          override def inspect(tree: Tree): Unit = {
            tree match {
              case Apply(Select(left, TermName("$eq$eq" | "$bang$eq")), List(right)) =>
                if (left.toString() == right.toString())
                  context.warn(tree.pos, self)
              case _ => continue(tree)
            }
          }
        }
    }
}