added turtle executer

src/lib/turtle/TurtleExecuter.hx

@@ -0,0 +1,51 @@
+package lib.turtle;
+
+import kernel.turtle.Turtle;
+using tink.CoreApi;
+
+class TurtleExecuter {
+
+	private var instructions:Array<TurtleInstruction>;
+
+	public function new(instructions:Array<TurtleInstruction>) {
+		this.instructions = instructions;
+	}
+
+	public function execute() {
+		for (inst in instructions){
+			executeInst(inst);
+		}
+	}
+
+	private function executeInst(instruction: TurtleInstruction): Outcome<Noise,String> {
+		switch instruction {
+			case Forward:
+				return Turtle.instance.forward();
+			case Back:
+				return Turtle.instance.back();
+			case Up:
+				return Turtle.instance.up();
+			case Down:
+				return Turtle.instance.down();
+			case TurnLeft:
+				return Turtle.instance.turnLeft();
+			case TurnRight:
+				return Turtle.instance.turnRight();
+			case Dig(dir):
+				return Turtle.instance.dig(dir);
+			case Place(dir):
+				return Turtle.instance.place(dir);
+			case PlacseSign(dir, text):
+				return Turtle.instance.placeSign(dir, text);
+			case Select(slot):
+				var r = Turtle.instance.selectSlot(slot);
+				if (r.isSuccess()) {
+					return Outcome.Success(null);
+				} else {
+					return Outcome.Failure("Failed to select slot");
+				}
+		}
+
+		return Outcome.Failure("Unknown instruction: " + instruction);
+	}
+}