今天来看vendor/yiisoft/yii2/base/Module. php
<?php /** * @link http://www.yiiframework.com/ * @copyright Copyright (c) 2008 Yii Software LLC * @license http://www.yiiframework.com/license/ */ namespace yiibase; use Yii; use yiidiServiceLocator; /** * Module is the base class for module and application classes. * Module是模块和应用类的基类 * * A module represents a sub-application which contains MVC elements by itself, such as * models, views, controllers, etc. * 模块代表一个由模型、视图、控制器等组成的子应用 * * A module may consist of [[modules|sub-modules]]. * 模块内也可以包含模块或子模块 * * [[components|Components]] may be registered with the module so that they are globally * accessible within the module. * 组件可以注册到模块，以便在模块内全局访问 * * @property array $aliases List of path aliases to be defined. The array keys are alias names (must start * with '@') and the array values are the corresponding paths or aliases. See [[setAliases()]] for an example. * This property is write-only. * @property array $aliases 别名数组 只读 * @property string $basePath The root directory of the module. * @property string $basePath 模块的根路径 * @property string $controllerPath The directory that contains the controller classes. This property is * read-only. * @property string $controllerPath 控制的路径数组 只读 * @property string $layoutPath The root directory of layout files. Defaults to "[[viewPath]]/layouts". * @property string $layoutPath 模板路径数组 只读 * @property array $modules The modules (indexed by their IDs). * @property array $modules 模块数组 * @property string $uniqueId The unique ID of the module. This property is read-only. * @property string $uniqueId 模块的唯一ID 只读 * @property string $viewPath The root directory of view files. Defaults to "[[basePath]]/views". * @property string $viewPath 模块下的视图文件路径 * * @author Qiang Xue <qiang.xue@gmail.com> * @since 2.0 */ class Module extends ServiceLocator { /** * @event ActionEvent an event raised before executing a controller action. * @event ActionEvent Action事件，在执行控制的的action方法时触发 * You may set [[ActionEvent::isValid]] to be false to cancel the action execution. */ const EVENT_BEFORE_ACTION = 'beforeAction'; /** * @event ActionEvent an event raised after executing a controller action. * @event ActionEvent Action事件，在执行控制的的action方法后触发 */ const EVENT_AFTER_ACTION = 'afterAction'; /** * @var array custom module parameters (name => value). * @var array 自定义模块参数 */ public $params = []; /** * @var string an ID that uniquely identifies this module among other modules which have the same [[module|parent]]. * @var string 模块的唯一ID，用于区分同一父模块下的模块 */ public $id; /** * @var Module the parent module of this module. Null if this module does not have a parent. * @var 当前模块的父模块 */ public $module; /** * @var string|boolean the layout that should be applied for views within this module. This refers to a view name * relative to [[layoutPath]]. If this is not set, it means the layout value of the [[module|parent module]] * will be taken. If this is false, layout will be disabled within this module. * @var string|boolean 布局文件 */ public $layout; /** * @var array mapping from controller ID to controller configurations. * @var array 控制器ID到控制器配置的映射 * Each name-value pair specifies the configuration of a single controller. * A controller configuration can be either a string or an array. * If the former, the string should be the fully qualified class name of the controller. * If the latter, the array must contain a 'class' element which specifies * the controller's fully qualified class name, and the rest of the name-value pairs * in the array are used to initialize the corresponding controller properties. For example, * 每一个键值对指定一个单独的控制器，控制器配置可以是一个字符串或者数组，如果是前者，该字符串是指定控制的的全路径（即带命名空间的） * 如果是后者，则数组中包含一个‘class’元素，该元素指定控制器的全路径，其余的参数用于初始化对应的属性，例子如下： * * ```php * [ * 'account' => 'appcontrollersUserController',//字符串形式，指定了accout控制器的路径 * 'article' => [ * 'class' => 'appcontrollersPostController',//指定article控制器的路径 * 'pageTitle' => 'something new',//提供了pageTitle参数 * ], * ] * ``` */ public $controllerMap = []; /** * @var string the namespace that controller classes are in. * @var string 控制器的命名空间 * This namespace will be used to load controller classes by prepending it to the controller * class name. * 该命名空间用于加在控制器类的前面加载控制器类 * * If not set, it will use the `controllers` sub-namespace under the namespace of this module. * For example, if the namespace of this module is "fooar", then the default * controller namespace would be "fooarcontrollers". * 如果没有给定，默认为当前模块的命名空间加上 `controllers`构成的子命名空间 * 如当前模块的命名空间为"fooar"，那么控制器的默认命名空间为"fooarcontrollers" * * See also the [guide section on autoloading](guide:concept-autoloading) to learn more about * defining namespaces and how classes are loaded. */ public $controllerNamespace; /** * @var string the default route of this module. Defaults to 'default'. * @var string 当前模块的默认路由 默认为'default' * The route may consist of child module ID, controller ID, and/or action ID. * route 可能包含子模块ID，控制器ID，和/或 action ID，如果action ID未给定，则会调用[Controller::defaultAction]指定的action * For example, `help`, `post/create`, `admin/post/create`. * If action ID is not given, it will take the default value as specified in * [[Controller::defaultAction]]. */ public $defaultRoute = 'default'; /** * @var string the root directory of the module. * @var string 当前模块的根路径 */ private $_basePath; /** * @var string the root directory that contains view files for this module * @var string 当前模块下视图文件的路径数组 */ private $_viewPath; /** * @var string the root directory that contains layout view files for this module. * @var string 当前模块下的布局文件路径数组 */ private $_layoutPath; /** * @var array child modules of this module * @var array 当前模块的子模块数组 */ private $_modules = []; /** * Constructor. * 构造函数 * @param string $id the ID of this module * @param string $id 当前模块的ID * @param Module $parent the parent module (if any) * @param Module $parent 当前模块的父模块（如果有的话） * @param array $config name-value pairs that will be used to initialize the object properties * @param array $config 配置文件|数组 */ public function __construct($id, $parent = null, $config = []) { $this->id = $id;//给当前模块赋值唯一ID $this->module = $parent;//给module属性（即当前模块的父模块）赋值 parent::__construct($config);//将配置文件赋值到Object的属性中，因为Object是所有类的基类，理论可以整个项目中访问 } /** * Returns the currently requested instance of this module class. * 从Yii::$app->loadedModules['yiiwebApplication']数组中取得当前类的实例 * If the module class is not currently requested, null will be returned. * This method is provided so that you access the module instance from anywhere within the module. * 该方法可以在模块内的任何地方访问类的实例 * @return static|null the currently requested instance of this module class, or null if the module class is not requested. */ public static function getInstance() { $class = get_called_class(); return isset(Yii::$app->loadedModules[$class]) ? Yii::$app->loadedModules[$class] : null; } /** * Sets the currently requested instance of this module class. * 将当前类名和存储类的对象变量加入Yii::$app->loadedModules['yiiwebApplication']数组中 * 这样直接通过Yii::$app->loadedModules['yiiwebApplication']就可以直接调用这个类 * @param Module|null $instance the currently requested instance of this module class. * If it is null, the instance of the calling class will be removed, if any. */ public static function setInstance($instance)//module模块里会用到，为getInstance提供数据 { if ($instance === null) { unset(Yii::$app->loadedModules[get_called_class()]);//如果没有传入参数，说明是删除，直接unset } else { Yii::$app->loadedModules[get_class($instance)] = $instance;//否则将该类和类的实例存入loadedModules数组中 } } /** * Initializes the module. * 初始化模块，取出控制器的命名空间，也可以理解为路径 注：第一次加载的时候才会执行 * This method is called after the module is created and initialized with property values * given in configuration. The default implementation will initialize [[controllerNamespace]] * if it is not set. * * If you override this method, please make sure you call the parent implementation. */ public function init() { if ($this->controllerNamespace === null) {//判断controllerNamespace属性是否被赋值，没有赋值才执行 $class = get_class($this);//获取类名 if (($pos = strrpos($class, '\')) !== false) { $this->controllerNamespace = substr($class, 0, $pos) . '\controllers';//取得命名空间 } } } /** * 新建一个控制器实例基于给定的路线. */ public function createController($route) { if ($route === '') { $route = $this->defaultRoute; } // double slashes or leading/ending slashes may cause substr problem // 如果有双斜线或者结束的斜线，可能会引起问题 $route = trim($route, '/'); if (strpos($route, '//') !== false) { return false; } if (strpos($route, '/') !== false) { // 如果存在斜线，就根据斜线分割route，并限制最多分割成两个 list ($id, $route) = explode('/', $route, 2); } else { // 不存在，就直接赋值给$id $id = $route; $route = ''; } // module and controller map take precedence if (isset($this->controllerMap[$id])) { // 如果controllerMap中存在相应的$id，就使用Yii::createObject去创建该controller的实例 $controller = Yii::createObject($this->controllerMap[$id], [$id, $this]); return [$controller, $route]; } // 根据id获取module $module = $this->getModule($id); if ($module !== null) { // 获取到module，就递归调用相应module的createController去创建controller的实例 return $module->createController($route); } // 如果取到了module，就需要继续去取controller的ID // 再次根据斜线分割 if (($pos = strrpos($route, '/')) !== false) { // 如果有斜线，就将module的ID和后面截取出的内容一起拼成ID $id .= '/' . substr($route, 0, $pos); // 剩余的赋给route $route = substr($route, $pos + 1); } // 然后根据ID去创建controller的实例 $controller = $this->createControllerByID($id); // 未创建成功，并且route不为空 if ($controller === null && $route !== '') { // 将route拼接到ID中，再次去创建controller出的实例 $controller = $this->createControllerByID($id . '/' . $route); $route = ''; } return $controller === null ? false : [$controller, $route]; } /** * 创建一个控制器基于给定控制器ID. * * The controller ID is relative to this module. The controller class * should be namespaced under [[controllerNamespace]]. * * Note that this method does not check [[modules]] or [[controllerMap]]. * * @param string $id the controller ID * @return Controller the newly created controller instance, or null if the controller ID is invalid. * @throws InvalidConfigException if the controller class and its file name do not match. * This exception is only thrown when in debug mode. */ public function createControllerByID($id) { // $id是controller的ID，但它前面可能带有module的ID，而且可能是多层module ID // 取到最右边的斜线位置，可以分离出controller的名字 $pos = strrpos($id, '/'); if ($pos === false) { // 没有斜线，$id就是controller的名字 $prefix = ''; $className = $id; } else { // 有斜线，斜线前的是module的ID，斜线后是controller的名字 $prefix = substr($id, 0, $pos + 1); $className = substr($id, $pos + 1); } if (!preg_match('%^[a-z][a-z0-9\-_]*$%', $className)) { // 如果controller的名字不符合命名的规范，就返回null // 以小写字母开头，可以包含数字/小写字母/右斜线/中划线/下划线 return null; } if ($prefix !== '' && !preg_match('%^[a-z0-9_/]+$%i', $prefix)) { // 如果module的ID不符合module的命名规范，就返回null // 可以包含数字/小写字母/左斜线/下划线 return null; } // 先将-替换为空格，再将每个单词的首字母大写，再将空格替换为空字符串，最后拼接上'Controller'，就拿到了类名（不带namespace） $className = str_replace(' ', '', ucwords(str_replace('-', ' ', $className))) . 'Controller'; // 根据application和module中定义的controllerNamespace，拼出controller的类名，含namespace $className = ltrim($this->controllerNamespace . '\' . str_replace('/', '\', $prefix) . $className, '\'); if (strpos($className, '-') !== false || !class_exists($className)) { // 如果存在中划线或者类不存在，即返回null return null; } // is_subclass_of — 如果此对象是该类的子类，则返回 TRUE // 判断是不是'yiiaseController'的子类，是的话，就创建相应类的实例 if (is_subclass_of($className, 'yiiaseController')) { return Yii::createObject($className, [$id, $this]); } elseif (YII_DEBUG) { throw new InvalidConfigException("Controller class must extend from \yii\base\Controller."); } else { return null; } } /** * This method is invoked right before an action within this module is executed. * 这个方法被调用之前执行一个动作在这个模块 * If you override this method, your code should look like the following: *如果您重写此方法，您的代码应该看起来如下： * ```php * public function beforeAction($action) * { * if (parent::beforeAction($action)) { * // your custom code here * return true; // or false if needed * } else { * return false; * } * } * ``` * * @param Action $action the action to be executed. * @return boolean whether the action should continue to be executed. */ public function beforeAction($action) { $event = new ActionEvent($action); //该方法将触发[[EVENT_BEFORE_ACTION]]事件 $this->trigger(self::EVENT_BEFORE_ACTION, $event); return $event->isValid; } /** * This method is invoked right after an action within this module is executed. *调用该方法之后执行一个动作在这个模块。 * The method will trigger the [[EVENT_AFTER_ACTION]] event. The return value of the method. * ``` * * @param Action $action the action just executed. * @param mixed $result the action return result. * @return mixed the processed action result. */ public function afterAction($action, $result) { //初始化 $event = new ActionEvent($action); //该事件触发后赋值给$result $event->result = $result; //该方法将触发[[EVENT_BEFORE_ACTION]]事件 $this->trigger(self::EVENT_AFTER_ACTION, $event); return $event->result; } }