66 lines
1.6 KiB
JavaScript
66 lines
1.6 KiB
JavaScript
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var App = App || {};
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App.DI = (function() {
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var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
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var ARGUMENT_NAMES = /([^\s,]+)/g;
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var factories = {};
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var instances = {};
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function get(key) {
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var instance = instances[key];
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if (!instance) {
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var factory = factories[key];
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if (!factory)
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throw new Error('Unregistered key: ' + key);
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var objectInitializer = factory.initializer;
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var singleton = factory.singleton;
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var deps = resolveDependencies(objectInitializer);
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var instance = {};
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instance = objectInitializer.apply(instance, deps);
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if (singleton)
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instances[key] = instance;
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}
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return instance;
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}
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function resolveDependencies(objectIntializer) {
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var deps = [];
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var depKeys = getFunctionParameterNames(objectIntializer);
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for (var i = 0; i < depKeys.length; i ++) {
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deps[i] = get(depKeys[i]);
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}
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return deps;
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}
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function register(key, objectInitializer) {
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factories[key] = {initializer: objectInitializer, singleton: false};
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};
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function registerSingleton(key, objectInitializer) {
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factories[key] = {initializer: objectInitializer, singleton: true};
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};
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function registerManual(key, objectInitializer) {
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instances[key] = objectInitializer();
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};
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function getFunctionParameterNames(func) {
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var fnStr = func.toString().replace(STRIP_COMMENTS, '');
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var result = fnStr.slice(fnStr.indexOf('(') + 1, fnStr.indexOf(')')).match(ARGUMENT_NAMES);
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if (result === null) {
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result = [];
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}
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return result;
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}
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return {
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get: get,
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register: register,
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registerManual: registerManual,
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registerSingleton: registerSingleton,
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};
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})();
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