(function(root,factory){"use strict";if(typeof define==="function"&&define.amd){define([],factory)}else if(typeof exports==="object"){module.exports=factory()}else{root.Guard=factory()}})(this,function(){"use strict";return function(initConfig){var level=0;var config;var listeners=[];var isRequesting=false;var requestQueue=[];var _={isFunction:function(value){return typeof value=="function"},isArray:function(value){return Array.isArray(value)},isRegExp:function(value){return value instanceof RegExp}};function checkAccess(requestRule){if(!requestRule){return level>0}return function(){for(var i=0;i<=level;i++){var rules=config[i].allowed;for(var j=0;j<rules.length;j++){if(rules[j].test(requestRule)){return true}}}return false}()}function reqThenCallback(feature,callback){return function(){var args=arguments;if(checkAccess(feature)){setTimeout(function(){callback.apply(null,args)},0);return}requestQueue.push(callback);if(isRequesting){return}isRequesting=true;if(config[level].request){config[level].request(requestHandler)}function requestHandler(err){isRequesting=false;if(err){requestQueue=[];return}guard.setLevel(level+1);while(requestQueue.length){var nextRequest=requestQueue.shift();if(feature!=null){guard(feature,nextRequest).apply(null,args)}else{guard(nextRequest).apply(null,args)}}}}}var guard=function guard(){if(arguments.length===0){return checkAccess()}if(arguments.length===1){if(_.isFunction(arguments[0])){return reqThenCallback(null,arguments[0])}else{return checkAccess(arguments[0])}}if(!_.isFunction(arguments[1])){throw new TypeError}return reqThenCallback(arguments[0],arguments[1])};guard.request=function(callback){if(callback&&!_.isFunction(callback)){throw new TypeError}if(!callback){callback=function(){}}return reqThenCallback(null,callback)()};guard.setup=function(newConfig){if(_.isFunction(newConfig)){config=[{allowed:[],request:newConfig},{allowed:[/.*/]}]}else if(_.isArray(newConfig)){config=newConfig.map(function(val){return{allowed:val.allowed.map(function(rule){if(_.isRegExp(rule)){return rule}var ruleNorm="^"+rule.replace("*",".*")+"$";return new RegExp(ruleNorm)}),request:val.request}})}else{config=[{allowed:[]},{allowed:[/.*/]}]}return config};guard.setLevel=function(newLevel){level=newLevel;listeners.forEach(function(listener){listener(newLevel)})};guard.getLevel=function(){return level};guard.listen=function(listener){listeners.push(listener);return function(){var i=listeners.indexOf(listener);if(i!==-1){listeners.splice(i,1)}listener=null}};guard.setup(initConfig);return guard}});