[K/N] Safe determining Kotlin/Native meta version

konan/utils/src/org/jetbrains/kotlin/konan/KonanVersion.kt

@@ -20,12 +20,18 @@ interface KonanVersion : Serializable {
         // major.minor.patch-meta-build where patch, meta and build are optional.
         private val versionPattern = "(\\d+)\\.(\\d+)(?:\\.(\\d+))?(?:-(\\p{Alpha}\\p{Alnum}*))?(?:-(\\d+))?".toRegex()
 
-        fun fromString(version: String) : KonanVersion {
+        fun fromString(version: String): KonanVersion {
             val (major, minor, maintenance, metaString, build) =
-                    versionPattern.matchEntire(version)?.destructured ?:
-                    throw IllegalArgumentException("Cannot parse Kotlin/Native version: $version")
-            val meta = metaString.ifEmpty { "release" }.let { MetaVersion.valueOf(it.toUpperCase()) }
-            return KonanVersionImpl(meta, major.toInt(), minor.toInt(), maintenance.toIntOrNull() ?: 0, build.toIntOrNull() ?: -1)
+                    versionPattern.matchEntire(version)?.destructured
+                        ?: throw IllegalArgumentException("Cannot parse Kotlin/Native version: $version")
+
+            return KonanVersionImpl(
+                MetaVersion.findAppropriate(metaString),
+                major.toInt(),
+                minor.toInt(),
+                maintenance.toIntOrNull() ?: 0,
+                build.toIntOrNull() ?: -1
+            )
         }
     }
 }

konan/utils/src/org/jetbrains/kotlin/konan/MetaVersion.kt

@@ -17,5 +17,13 @@ enum class MetaVersion(val metaString: String) {
     BETA("beta"),
     RC1("rc1"),
     RC2("rc2"),
-    RELEASE("release")
+    RELEASE("release");
+
+    companion object {
+
+        fun findAppropriate(metaString: String): MetaVersion {
+            return MetaVersion.values().find { it.metaString.equals(metaString, ignoreCase = true) }
+                ?: if (metaString.isBlank()) RELEASE else error("Unknown meta version: $metaString")
+        }
+    }
 }