lkarch.org/tools/mathisfun/www.mathsisfun.com/games/a/astray/keyboard.js

/*!
* KeyboardJS
*
* Copyright 2011, Robert William Hurst
* Licenced under the BSD License.
* See https://raw.github.com/RobertWHurst/KeyboardJS/master/license.txt
*/(function(context,factory){if(typeof define==='function'&&define.amd){define(factory);}else{context.k=context.KeyboardJS=factory();}}(this,function(){function bind(target,type,handler){if(target.addEventListener){target.addEventListener(type,handler,false);}else{target.attachEvent("on"+type,function(event){return handler.call(target,event);});}}
[].indexOf||(Array.prototype.indexOf=function(a,b,c){for(c=this.length,b=(c+~~b)%c;b<c&&(!(b in this)||this[b]!==a);b++);return b^c?b:-1;});var locals={'us':{"backspace":8,"tab":9,"enter":13,"shift":16,"ctrl":17,"alt":18,"pause":19,"break":19,"capslock":20,"escape":27,"esc":27,"space":32,"spacebar":32,"pageup":33,"pagedown":34,"end":35,"home":36,"left":37,"up":38,"right":39,"down":40,"insert":45,"delete":46,"0":48,"1":49,"2":50,"3":51,"4":52,"5":53,"6":54,"7":55,"8":56,"9":57,"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,"meta":91,"command":91,"windows":91,"win":91,"_91":92,"select":93,"num0":96,"num1":97,"num2":98,"num3":99,"num4":100,"num5":101,"num6":102,"num7":103,"num8":104,"num9":105,"multiply":106,"add":107,"subtract":109,"decimal":110,"divide":111,"f1":112,"f2":113,"f3":114,"f4":115,"f5":116,"f6":117,"f7":118,"f8":119,"f9":120,"f10":121,"f11":122,"f12":123,"numlock":144,"num":144,"scrolllock":145,"scroll":145,"semicolon":186,"equal":187,"equalsign":187,"comma":188,"dash":189,"period":190,"slash":191,"forwardslash":191,"graveaccent":192,"openbracket":219,"backslash":220,"closebracket":221,"singlequote":222}}
var keys=locals['us'],activeKeys=[],activeBindings={},keyBindingGroups=[];bind(document,"keydown",function(event){for(var key in keys){if(keys.hasOwnProperty(key)&&event.keyCode===keys[key]){if(activeKeys.indexOf(key)<0){activeKeys.push(key);}}}
return executeActiveKeyBindings(event);});bind(document,"keyup",function(event){for(var key in keys){if(keys.hasOwnProperty(key)&&event.keyCode===keys[key]){var iAK=activeKeys.indexOf(key);if(iAK>-1){activeKeys.splice(iAK,1);}}}
return pruneActiveKeyBindings(event);});bind(window,"blur",function(){activeKeys=[];return pruneActiveKeyBindings(event);});function queryActiveBindings(){var bindingStack=[];for(var keyCount=keyBindingGroups.length;keyCount>-1;keyCount-=1){if(keyBindingGroups[keyCount]){var KeyBindingGroup=keyBindingGroups[keyCount];for(var bindingIndex=0;bindingIndex<KeyBindingGroup.length;bindingIndex+=1){var binding=KeyBindingGroup[bindingIndex],keyBindingActive=true;for(var keyIndex=0;keyIndex<binding.keys.length;keyIndex+=1){var key=binding.keys[keyIndex];if(activeKeys.indexOf(key)<0){keyBindingActive=false;}}
if(keyBindingActive){bindingStack.push(binding);}}}}
return bindingStack;}
function executeActiveKeyBindings(event){if(activeKeys<1){return true;}
var bindingStack=queryActiveBindings(),spentKeys=[],output;for(var bindingIndex=0;bindingIndex<bindingStack.length;bindingIndex+=1){var binding=bindingStack[bindingIndex],usesSpentKey=false;for(var keyIndex=0;keyIndex<binding.keys.length;keyIndex+=1){var key=binding.keys[keyIndex];if(spentKeys.indexOf(key)>-1){usesSpentKey=true;break;}}
if(!usesSpentKey){if(typeof binding.callback==="function"){if(!binding.callback(event,binding.keys,binding.keyCombo)){output=false}}
if(!activeBindings[binding.keyCombo]){activeBindings[binding.keyCombo]=binding;}
for(var keyIndex=0;keyIndex<binding.keys.length;keyIndex+=1){var key=binding.keys[keyIndex];if(spentKeys.indexOf(key)<0){spentKeys.push(key);}}}}
if(spentKeys.length){return false;}
return output;}
function pruneActiveKeyBindings(event){var bindingStack=queryActiveBindings();var output;for(var bindingCombo in activeBindings){if(activeBindings.hasOwnProperty(bindingCombo)){var binding=activeBindings[bindingCombo],active=false;for(var bindingIndex=0;bindingIndex<bindingStack.length;bindingIndex+=1){var activeCombo=bindingStack[bindingIndex].keyCombo;if(activeCombo===bindingCombo){active=true;break;}}
if(!active){if(typeof binding.endCallback==="function"){if(!binding.endCallback(event,binding.keys,binding.keyCombo)){output=false}}
delete activeBindings[bindingCombo];}}}
return output;}
function bindKey(keyCombo,callback,endCallback){function clear(){if(keys&&keys.length){var keyBindingGroup=keyBindingGroups[keys.length];if(keyBindingGroup.indexOf(keyBinding)>-1){var index=keyBindingGroups[keys.length].indexOf(keyBinding);keyBindingGroups[keys.length].splice(index,1);}}}
var bindSets=keyCombo.toLowerCase().replace(/\s/g,'').split(',');for(var i=0;i<bindSets.length;i+=1){var keys=bindSets[i].split('+');if(keys.length){if(!keyBindingGroups[keys.length]){keyBindingGroups[keys.length]=[];}
var keyBinding={"callback":callback,"endCallback":endCallback,"keyCombo":bindSets[i],"keys":keys};keyBindingGroups[keys.length].push(keyBinding);}}
return{"clear":clear}}
function bindAxis(up,down,left,right,callback){function clear(){if(typeof clearUp==='function'){clearUp();}
if(typeof clearDown==='function'){clearDown();}
if(typeof clearLeft==='function'){clearLeft();}
if(typeof clearRight==='function'){clearRight();}
if(typeof timer==='function'){clearInterval(timer);}}
var axis=[0,0];if(typeof callback!=='function'){return false;}
var clearUp=bindKey(up,function(){if(axis[0]===0){axis[0]=-1;}},function(){axis[0]=0;}).clear;var clearDown=bindKey(down,function(){if(axis[0]===0){axis[0]=1;}},function(){axis[0]=0;}).clear;var clearLeft=bindKey(left,function(){if(axis[1]===0){axis[1]=-1;}},function(){axis[1]=0;}).clear;var clearRight=bindKey(right,function(){if(axis[1]===0){axis[1]=1;}},function(){axis[1]=0;}).clear;var timer=setInterval(function(){if(axis[0]===0&&axis[1]===0){return;}
callback(axis);},1);return{"clear":clear}}
function unbindKey(keys){if(keys==='all'){keyBindingGroups=[];return;}
keys=keys.replace(/\s/g,'').split(',');for(var iKCL=keyBindingGroups.length;iKCL>-1;iKCL-=1){if(keyBindingGroups[iKCL]){var KeyBindingGroup=keyBindingGroups[iKCL];for(var iB=0;iB<KeyBindingGroup.length;iB+=1){var keyBinding=KeyBindingGroup[iB],remove=false;for(var iKB=0;iKB<keyBinding.keys.length;iKB+=1){var key=keyBinding.keys[iKB];for(var iKR=0;iKR<keys.length;iKR+=1){var keyToRemove=keys[iKR];if(keyToRemove===key){remove=true;break;}}
if(remove){break;}}
if(remove){keyBindingGroups[iKCL].splice(iB,1);iB-=1;if(keyBindingGroups[iKCL].length<1){delete keyBindingGroups[iKCL];}}}}}}
function getActiveKeys(){return activeKeys;}
function addLocale(local,keys){locals[local]=keys;}
function setLocale(local){if(locals[local]){keys=locals[local];}}
return{"bind":{"key":bindKey,"axis":bindAxis},"activeKeys":getActiveKeys,"unbind":{"key":unbindKey},"locale":{"add":addLocale,"set":setLocale}}}));