com.sksamuel.scapegoat.inspections.style.SimplifyBooleanExpression.scala Maven / Gradle / Ivy

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package com.sksamuel.scapegoat.inspections.style

import com.sksamuel.scapegoat.{Inspection, InspectionContext, Inspector, Levels}

/**
 * @author Stephen Samuel
 */
class SimplifyBooleanExpression
    extends Inspection(
      text = "Simplify boolean expressions",
      defaultLevel = Levels.Info,
      description = "Checks for boolean expressions that can be simplified.",
      explanation = "Boolean expressions such as x == false can be re-written as !x."
    ) {
  def inspector(context: InspectionContext): Inspector =
    new Inspector(context) {
      override def postTyperTraverser =
        new context.Traverser {

          import context.global._

          private val Equals = TermName("$eq$eq")

          override def inspect(tree: Tree): Unit = {
            tree match {
              case Apply(Select(_, Equals), List(Literal(Constant(false)))) =>
                context.warn(tree.pos, self, tree.toString.take(200))
              case _ => continue(tree)
            }
          }
        }
    }
}