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module-loader.js
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module-loader.js
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window.uniqueAppName = window.uniqueAppName || {};
/**
* class Module
*/
uniqueAppName.module = (function(window){
var proto = Module.prototype,
/**
* private class
*
* class Loader
*/
Loader = (function(window){
var proto = Loader.prototype,
/**
* private static
* @type {object}
*/
scripts = {};
/**
* @constructor
*/
function Loader(){}
/**
* create script DOM element, appends it to head
*
* @param {string} path
*/
proto.load = function(path){
if (scripts[path]) {
return;
}
var script = window.document.createElement('SCRIPT');
script.async = true;
script.type = 'text/javascript';
script.charset = 'UTF-8';
script.src = path;
window.document.getElementsByTagName('HEAD')[0].appendChild(script);
scripts[path] = path;
};
return Loader;
})(window);
/**
* @constructor
*/
function Module(){
this.modules = {};
this.subscribers = {};
this.nameSpaceConfig = {};
this.loader = new Loader();
}
/**
* @param {string} basePath
*/
proto.setBasePath = function(basePath){
if (basePath && basePath.substr(-1) != '/') {
basePath += '/';
}
this.setNameSpaceConfig({'': basePath});
};
/**
* @param {object} config
*/
proto.setNameSpaceConfig = function(config){
this.nameSpaceConfig = config;
};
/**
* @param {Array} dependencies
* @param {string} name - module name
* @param {function} create - module create func, use module names as parameters
*/
proto.define = function(dependencies, name, create) {
var i;
/**
* calls onModuleDefined subscribers when a new module is initialized
*
* @type {function(this:Module, name:string)}
*/
var callSubscribers = function(name) {
if (this.subscribers[name]) {
for (var i = 0; i < this.subscribers[name].length; i++) {
this.subscribers[name][i]();
}
delete this.subscribers[name];
}
}.bind(this);
/**
* create onModuleDefined to incapsulate dependencies and create func
* create module when all dependencies are loaded
*
* @type {function(this:Module)}
*/
var onModuleDefined = function() {
var args = [];
for (var i = 0; i < dependencies.length; i++) {
var dependency = dependencies[i];
if (this.modules[dependency]) {
args.push(this.modules[dependency]);
} else {
return;
}
}
this.modules[name] = create.apply(window, args);
callSubscribers(name);
}.bind(this);
// if no dependencies create module and fire all subscribers
if (dependencies.length <= 0) {
this.modules[name] = create();
callSubscribers(name);
return;
}
var args = [];
for (i = 0; i < dependencies.length; i++) {
var dependency = dependencies[i];
// if dependency is loaded push to args
if (this.modules[dependency]) {
args.push(this.modules[dependency]);
continue;
}
if (!this.subscribers[dependency]) {
this.subscribers[dependency] = [];
}
// add subscriber for dependency
this.subscribers[dependency].push(onModuleDefined);
for (var prefix in this.nameSpaceConfig) {
if (dependency.substr(0, prefix.length) == prefix) {
var basePath = this.nameSpaceConfig[prefix];
this.loader.load(basePath + dependency.substr(prefix.length) +'.js');
break;
}
}
}
// if all dependencies are loaded create module
if (args.length == dependencies.length) {
this.modules[name] = create.apply(window, args);
callSubscribers(name);
}
};
return new Module();
})(window);