fix.RedundantCaseClassVal.scala Maven / Gradle / Ivy

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package fix

import scala.meta.Ctor
import scala.meta.Defn
import scala.meta.Mod
import scala.meta.XtensionClassifiable
import scala.meta.XtensionCollectionLikeUI
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 RedundantCaseClassVal extends SyntacticRule("RedundantCaseClassVal") {
  override def fix(implicit doc: SyntacticDocument): Patch = {
    doc.tree.collect {
      case c @ Defn.Class.After_4_6_0(
            _,
            _,
            _,
            Ctor.Primary.After_4_6_0(
              _,
              _,
              params1 :: _
            ),
            _
          ) if c.mods.exists(_.is[Mod.Case]) =>
        params1
          .filterNot(
            _.mods.exists(m =>
              m.is[Mod.Implicit] ||
                m.is[Mod.Private] ||
                m.is[Mod.Protected] ||
                m.is[Mod.Override] ||
                m.is[Mod.Final]
            )
          )
          .flatMap { p =>
            p.mods.find(_.is[Mod.ValParam]).map { valMod =>
              Patch.lint(
                Diagnostic(
                  id = "",
                  message = "redundant case class val",
                  position = valMod.pos,
                  severity = LintSeverity.Warning
                )
              )
            }
          }
          .asPatch
    }.asPatch
  }
}