Data commit

Task/Bulls-and-cows/Ceylon/bulls-and-cows.ceylon

@@ -0,0 +1,70 @@
+import ceylon.random {
+    DefaultRandom
+}
+
+shared void run() {
+
+    value random = DefaultRandom();
+
+    function generateDigits() =>
+            random.elements(1..9).distinct.take(4).sequence();
+
+    function validate(String guess) {
+        variable value ok = true;
+        if (!guess.every((Character element) => element.digit)) {
+            print("numbers only, please");
+            ok = false;
+        }
+        if ('0' in guess) {
+            print("only 1 to 9, please");
+            ok = false;
+        }
+        if (guess.distinct.shorterThan(guess.size)) {
+            print("no duplicates, please");
+            ok = false;
+        }
+        if (guess.size != 4) {
+            print("4 digits please");
+            ok = false;
+        }
+        return ok;
+    }
+
+    function score({Integer*} target, {Integer*} guess) {
+        variable value bulls = 0;
+        variable value cows = 0;
+        for ([a, b] in zipPairs(target, guess)) {
+            if (a == b) {
+                bulls++;
+            } else if (target.contains(b)) {
+                cows++;
+            }
+        }
+        return [bulls, cows];
+    }
+
+    while (true) {
+        value digits = generateDigits();
+        print("I have chosen my four digits, please guess what they are.
+               Use only the digits 1 to 9 with no duplicates and enter them with no spaces. eg 1234
+               Enter q or Q to quit.");
+        while (true) {
+            if (exists line = process.readLine()) {
+                if (line.uppercased == "Q") {
+                    return;
+                }
+                if (validate(line)) {
+                    value guessDigits = line.map((Character element) => Integer.parse(element.string)).narrow<Integer>();
+                    value [bulls, cows] = score(digits, guessDigits);
+                    if (bulls == 4) {
+                        print("You win!");
+                        break;
+                    }
+                    else {
+                        print("Bulls: ``bulls``, Cows:  ``cows``");
+                    }
+                }
+            }
+        }
+    }
+}