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FilterMatcher: turn into metaconfig-parsable type #4102

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Jul 11, 2024
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FilterMatcher: turn into metaconfig-parsable type #4102

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25 changes: 25 additions & 0 deletions scalafmt-core/shared/src/main/scala/org/scalafmt/config/FilterMatcher.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -4,13 +4,38 @@ import org.scalafmt.sysops.AbsoluteFile

import scala.util.matching.Regex

import metaconfig._

case class FilterMatcher(include: Regex, exclude: Regex) {
def matchesFile(file: AbsoluteFile): Boolean = matches(file.toString())
def matches(input: String): Boolean = include.pattern.matcher(input).find() &&
!exclude.pattern.matcher(input).find()
}

object FilterMatcher {
val default = FilterMatcher(".*".r, "^$".r)

implicit val filterMatcherSurface: generic.Surface[FilterMatcher] = generic
.deriveSurface[FilterMatcher]
implicit val filterMatcherEncoder: ConfEncoder[FilterMatcher] = generic
.deriveEncoder[FilterMatcher]
implicit val filterMatcherDecoder: ConfDecoderEx[FilterMatcher] = generic
.deriveDecoderEx(default)

implicit val regexEncoder: ConfEncoder[Regex] = ConfEncoder.StringEncoder
.contramap[Regex](_.regex)
implicit val regexDecoder: ConfDecoderEx[Regex] = {
val seqStringDecoder = implicitly[ConfDecoderEx[Seq[String]]]
(state, conf) =>
seqStringDecoder.read(state.map(x => Seq(x.regex)), conf) match {
case Configured.Ok(x) => Configured.Ok(mkRegexp(x))
case x: Configured.NotOk => conf match {
case Conf.Str(s) => Configured.Ok(s.r)
case _ => x
}
}
}

def mkRegexp(filters: Seq[String], strict: Boolean = false): Regex =
filters match {
case Nil => "$a".r // will never match anything
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