1 files changed, 30 insertions, 0 deletions
diff --git a/scalalib/src/dependency/versions/VersionParser.scala b/scalalib/src/dependency/versions/VersionParser.scala
new file mode 100644
index 00000000..10aebd73
--- /dev/null
+++ b/scalalib/src/dependency/versions/VersionParser.scala
@@ -0,0 +1,30 @@
+package mill.scalalib.dependency.versions
+
+import fastparse._, NoWhitespace._
+
+private[dependency] object VersionParser {
+
+  private def numberParser[_: P] =
+    P(CharIn("0-9").rep(1).!.map(_.toLong))
+  private def numericPartParser[_: P] =
+    P(numberParser ~ &(CharIn(".\\-+") | End)).rep(min = 1, sep = ".")
+
+  private def tokenParser[_: P] =
+    CharPred(c => c != '.' && c != '-' && c != '+').rep(1).!
+  private def tokenPartParser[_: P] =
+    tokenParser.rep(sep = CharIn(".\\-"))
+
+  private def firstPartParser[_: P] =
+    P(CharIn(".\\-") ~ tokenPartParser).?
+
+  private def secondPartParser[_: P] =
+    P("+" ~ tokenPartParser).?
+
+  private def versionParser[_: P] =
+    P(numericPartParser ~ firstPartParser ~ secondPartParser).map {
+      case (a, b, c) => (a, b.getOrElse(Seq.empty), c.getOrElse(Seq.empty))
+    }
+
+  def parse(text: String): Parsed[(Seq[Long], Seq[String], Seq[String])] =
+    fastparse.parse(text, versionParser(_))
+}