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• Scala3Placeholder.scala

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fix.Scala3Placeholder.scala Maven / Gradle / Ivy

package fix

import scala.meta.Type
import scala.meta.Type.Bounds
import scala.meta.XtensionCollectionLikeUI
import scala.meta.inputs.Position
import scalafix.Patch
import scalafix.lint.Diagnostic
import scalafix.lint.LintSeverity
import scalafix.v1.SyntacticDocument
import scalafix.v1.SyntacticRule
import scalafix.v1.XtensionSeqPatch

class Scala3Placeholder extends SyntacticRule("Scala3Placeholder") {
  override def fix(implicit doc: SyntacticDocument): Patch = {
    doc.tree.collect {
      case t @ Type.Wildcard(Bounds(None, None)) if t.toString == "_" =>
        Seq(
          Patch.lint(
            Scala3PlaceholderWarn(t.pos)
          ),
          Patch.replaceTree(t, "?")
        ).asPatch
    }.asPatch
  }
}

case class Scala3PlaceholderWarn(override val position: Position) extends Diagnostic {
  override def message: String = "use ? instead of _"
  override def severity: LintSeverity = LintSeverity.Warning
}