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• UnusedConstructorParams.scala

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fix.UnusedConstructorParams.scala Maven / Gradle / Ivy

package fix

import scala.meta.Defn
import scala.meta.Mod
import scala.meta.XtensionClassifiable
import scala.meta.XtensionCollectionLikeUI
import scala.meta.inputs.Position
import scala.meta.termParamClauseToValues
import scalafix.Patch
import scalafix.lint.Diagnostic
import scalafix.lint.LintSeverity
import scalafix.v1.SyntacticDocument
import scalafix.v1.SyntacticRule
import scalafix.v1.XtensionSeqPatch

class UnusedConstructorParams extends SyntacticRule("UnusedConstructorParams") {
  override def isLinter = true

  override def fix(implicit doc: SyntacticDocument): Patch = {
    doc.tree.collect {
      case x: Defn.Class if !x.mods.exists(_.is[Mod.Case]) =>
        val params = x.ctor.paramClauses.flatten
          .filterNot(_.mods.exists(_.is[Mod.Implicit]))
          .filterNot(_.mods.exists(_.is[Mod.VarParam]))
          .filterNot(_.mods.exists(_.is[Mod.ValParam]))
        val allTokens = {
          val values = x.templ.tokens.map(_.text).toSet
          values ++ values.filter(a => a.startsWith("`") && a.endsWith("`")).map(_.drop(1).dropRight(1))
        }
        val maybeUnused = params.filterNot(p => allTokens(p.name.value))
        maybeUnused.map { a =>
          Patch.lint(
            UnusedParamWarn(a.pos)
          )
        }.asPatch
    }.asPatch
  }
}

case class UnusedParamWarn(override val position: Position) extends Diagnostic {
  override def message: String = s"maybe unused constructor param"

  override def severity: LintSeverity = LintSeverity.Warning
}