Update lib.js

lib.js

@@ -0,0 +1,34 @@
+var keyStrokes = [];
+window.callDefinedFunction = function(callback,keyCodeValues){
+    if(typeof callback !== "function")
+        throw new TypeError("Expected callback as first argument");
+    if(typeof keyCodeValues !== "object" && (!Array.isArray || Array.isArray(keyCodeValues)))
+        throw new TypeError("Expected array as second argument");
+    var pressedKeysValid = true;
+    for(var i = 0; i < keyCodeValues.length; ++i)
+        pressedKeysValid = pressedKeysValid && keyStrokes[keyCodeValues[i]];
+    if(pressedKeysValid)
+        callback();
+};
+window.addShortcut = function(callback,keyCodeValues){
+    if(typeof keyCodeValues === "number")
+        keyCodeValues = [keyCodeValues];
+    var funct = function(cb,val){
+        return function(e){
+            keyStrokes[e.keyCode] = true;
+            callDefinedFunction(cb,val);
+        };        
+    }(callback,keyCodeValues);
+    window.addEventListener('keydown',funct);
+    return funct;
+};
+window.addEventListener('keyup',function(e){
+    keyStrokes[e.keyCode] = false;
+});
+var key = {
+    A:65,B:66,C:67,D:68,E:69,F:70,G:71,H:72,I:73,J:74,K:75,L:76,M:77,N:78,O:79,P:80,Q:81,R:82,S:83,T:84,U:85,V:86,W:87,X:88,Y:89,Z:90,
+    ZERO:48,ONE:49,TWO:50,THREE:51,FOUR:52,FIVE:53,SIX:54,SEVEN:55,EIGHT:56,NINE:57,
+    SHIFT:16,CTRL:17,ALT:18,
+    ENTER:13,
+    LEFT:37,UP:38,RIGHT:39,DOWN:40
+};