Ability to lift a ScalaVersion from a String

Author: joan38

lib/src/main/scala/org/typelevel/scalacoptions/ScalaVersion.scala

@@ -44,6 +44,17 @@ object ScalaVersion {
   val V3_3_0   = ScalaVersion(3, 3, 0)
   val V3_3_1   = ScalaVersion(3, 3, 1)
 
+  private val versionRegex = raw"""(\d+)\.(\d+)\.(\d+)(?:-.*)?""".r
+  def fromString(version: String): Either[IllegalArgumentException, ScalaVersion] =
+    version match {
+      case versionRegex(major, minor, patch) =>
+        Right(ScalaVersion(major.toLong, minor.toLong, patch.toLong))
+      case _ => Left(new IllegalArgumentException(s"Scala version $version not recognized"))
+    }
+
+  def unsafeFromString(version: String): ScalaVersion =
+    fromString(version).fold(throw _, identity)
+
   implicit val scalaVersionOrdering: Ordering[ScalaVersion] =
     Ordering.by(version => (version.major, version.minor, version.patch))
 }

lib/src/test/scala/org/typelevel/scalacoptions/ScalaVersionSuite.scala

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Typelevel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.typelevel.scalacoptions
+
+import org.scalacheck.Gen
+import org.scalacheck.Prop.forAll
+
+class ScalaVersionSuite extends munit.ScalaCheckSuite {
+  val versionGen = Gen.chooseNum(0L, 20L)
+
+  property("fromString parse a version") {
+    forAll(versionGen, versionGen, versionGen) {
+      (currentMaj: Long, currentMin: Long, currentPatch: Long) =>
+        val version = ScalaVersion.fromString(s"$currentMaj.$currentMin.$currentPatch")
+        assertEquals(version, Right(ScalaVersion(currentMaj, currentMin, currentPatch)))
+    }
+  }
+
+  property("fromString parse an RC version") {
+    forAll(versionGen, versionGen, versionGen) {
+      (currentMaj: Long, currentMin: Long, currentPatch: Long) =>
+        val version = ScalaVersion.fromString(s"$currentMaj.$currentMin.$currentPatch-RC3")
+        assertEquals(version, Right(ScalaVersion(currentMaj, currentMin, currentPatch)))
+    }
+  }
+}