June 2018 Update

Task/Generate-Chess960-starting-position/Scala/generate-chess960-starting-position-1.scala

@@ -0,0 +1,25 @@
+import scala.annotation.tailrec
+
+object Chess960 extends App {
+
+  private val pieces = List('♖', '♗', '♘', '♕', '♔', '♘', '♗', '♖')
+
+  @tailrec
+  private def generateFirstRank(pieces: List[Char]): List[Char] = {
+    def check(rank: String) =
+      rank.matches(".*♖.*♔.*♖.*") && rank.matches(".*♗(..|....|......|)♗.*")
+
+    val p = scala.util.Random.shuffle(pieces)
+    if (check(p.toString.replaceAll("[^\\p{Upper}]", "")))
+      generateFirstRank(pieces)
+    else p
+  }
+
+  loop(10)
+
+  @tailrec
+  private def loop(n: Int): Unit = {
+    println(generateFirstRank(pieces))
+    if (n <= 0) () else loop(n - 1)
+  }
+}