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package mill.main
import mill.util.EitherOps
import fastparse.all._
import mill.define.{Segment, Segments}
object ParseArgs {
def apply(scriptArgs: Seq[String])
: Either[String, (List[(Option[Segments], Segments)], Seq[String])] = {
val (selectors, args, isMultiSelectors) = extractSelsAndArgs(scriptArgs)
for {
_ <- validateSelectors(selectors)
expandedSelectors <- EitherOps
.sequence(selectors.map(expandBraces))
.map(_.flatten)
_ <- validateExpanded(expandedSelectors, isMultiSelectors)
selectors <- EitherOps.sequence(expandedSelectors.map(extractSegments))
} yield (selectors.toList, args)
}
def extractSelsAndArgs(
scriptArgs: Seq[String]): (Seq[String], Seq[String], Boolean) = {
val multiFlags = Seq("--all", "--seq")
val isMultiSelectors = scriptArgs.headOption.exists(multiFlags.contains)
if (isMultiSelectors) {
val dd = scriptArgs.indexOf("--")
val selectors = (if (dd == -1) scriptArgs
else scriptArgs.take(dd)).filterNot(multiFlags.contains)
val args = if (dd == -1) Seq.empty else scriptArgs.drop(dd + 1)
(selectors, args, isMultiSelectors)
} else {
(scriptArgs.take(1), scriptArgs.drop(1), isMultiSelectors)
}
}
private def validateSelectors(
selectors: Seq[String]): Either[String, Unit] = {
if (selectors.isEmpty || selectors.exists(_.isEmpty))
Left("Selector cannot be empty")
else Right(())
}
private def validateExpanded(expanded: Seq[String],
isMulti: Boolean): Either[String, Unit] = {
if (!isMulti && expanded.length > 1)
Left("Please use --all flag to run multiple tasks")
else Right(())
}
def expandBraces(selectorString: String): Either[String, List[String]] = {
parseBraceExpansion(selectorString) match {
case f: Parsed.Failure => Left(s"Parsing exception ${f.msg}")
case Parsed.Success(expanded, _) => Right(expanded.toList)
}
}
private sealed trait Fragment
private object Fragment {
case class Keep(value: String) extends Fragment
case class Expand(values: List[List[Fragment]]) extends Fragment
def unfold(fragments: List[Fragment]): Seq[String] = {
fragments match {
case head :: rest =>
val prefixes = head match {
case Keep(v) => Seq(v)
case Expand(Nil) => Seq("{}")
case Expand(List(vs)) => unfold(vs).map("{" + _ + "}")
case Expand(vss) => vss.flatMap(unfold)
}
for {
prefix <- prefixes
suffix <- unfold(rest)
} yield prefix + suffix
case Nil => Seq("")
}
}
}
private object BraceExpansionParser {
val plainChars =
P(CharsWhile(c => c != ',' && c != '{' && c != '}')).!.map(Fragment.Keep)
val toExpand: P[Fragment] =
P("{" ~ braceParser.rep(1).rep(sep = ",") ~ "}").map(
x => Fragment.Expand(x.toList.map(_.toList))
)
val braceParser = P(toExpand | plainChars)
val parser = P(braceParser.rep(1).rep(sep = ",") ~ End)
}
private def parseBraceExpansion(input: String) = {
def unfold(vss: List[Seq[String]]): Seq[String] = {
vss match {
case Nil => Seq("")
case head :: rest =>
for {
str <- head
r <- unfold(rest)
} yield
r match {
case "" => str
case _ => str + "," + r
}
}
}
BraceExpansionParser.parser
.map { vss =>
val stringss = vss.map(x => Fragment.unfold(x.toList)).toList
unfold(stringss)
}
.parse(input)
}
def extractSegments(selectorString: String): Either[String, (Option[Segments], Segments)] =
parseSelector(selectorString) match {
case f: Parsed.Failure => Left(s"Parsing exception ${f.msg}")
case Parsed.Success(selector, _) => Right(selector)
}
private def parseSelector(input: String) = {
val identChars = ('a' to 'z') ++ ('A' to 'Z') ++ ('0' to '9') ++ "_"
val ident = P( CharsWhileIn(identChars) ).!
val ident2 = P( CharsWhileIn(identChars ++ ".") ).!
val segment = P( ident ).map( Segment.Label)
val crossSegment = P("[" ~ ident2.rep(1, sep = ",") ~ "]").map(Segment.Cross)
val simpleQuery = P(segment ~ ("." ~ segment | crossSegment).rep).map {
case (h, rest) => Segments(h :: rest.toList:_*)
}
val query = P( simpleQuery ~ ("/" ~/ simpleQuery).?).map{
case (q, None) => (None, q)
case (q, Some(q2)) => (Some(q), q2)
}
query.parse(input)
}
}
|
