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

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+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) => parseInteger(element.string)).coalesced;
+					value [bulls, cows] = score(digits, guessDigits);
+					if(bulls == 4) {
+						print("You win!");
+						break;
+					} else {
+						print("Bulls: ``bulls``, Cows:  ``cows``");
+					}
+				}
+			}
+		}
+	}
+}