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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\base;
use Yii;
/**
* Module is the base class for module and application classes.
*
* A module represents a sub-application which contains MVC elements by itself, such as
* models, views, controllers, etc.
*
* A module may consist of [[modules|sub-modules]].
*
* [[components|Components]] may be registered with the module so that they are globally
* accessible within the module.
*
* @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 string $basePath The root directory of the module.
* @property array $components The components (indexed by their IDs).
* @property string $controllerPath The directory that contains the controller classes.
* @property string $layoutPath The root directory of layout files. Defaults to "[[viewPath]]/layouts".
* @property array $modules The modules (indexed by their IDs).
* @property string $uniqueId The unique ID of the module. This property is read-only.
* @property string $viewPath The root directory of view files. Defaults to "[[basePath]]/view".
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
abstract class Module extends Component
{
/**
* @var array custom module parameters (name => value).
*/
public $params = [];
/**
* @var array the IDs of the components or modules that should be preloaded right after initialization.
*/
public $preload = [];
/**
* @var string an ID that uniquely identifies this module among other modules which have the same [[module|parent]].
*/
public $id;
/**
* @var Module the parent module of this module. Null if this module does not have a parent.
*/
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.
*/
public $layout;
/**
* @var array mapping from controller ID to controller configurations.
* 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 class name or path alias of the controller.
* If the latter, the array must contain a 'class' element which specifies
* the controller's class name or path alias, and the rest of the name-value pairs
* in the array are used to initialize the corresponding controller properties. For example,
*
* ~~~
* [
* 'account' => '@app/controllers/UserController',
* 'article' => [
* 'class' => '@app/controllers/PostController',
* 'pageTitle' => 'something new',
* ],
* ]
* ~~~
*/
public $controllerMap = [];
/**
* @var string the namespace that controller classes are in. 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 "foo\bar", then the default
* controller namespace would be "foo\bar\controllers".
*/
public $controllerNamespace;
/**
* @return string the default route of this module. Defaults to 'default'.
* The route may consist of child module ID, controller ID, and/or action ID.
* 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.
*/
private $_basePath;
/**
* @var string the root directory that contains view files for this module
*/
private $_viewPath;
/**
* @var string the root directory that contains layout view files for this module.
*/
private $_layoutPath;
/**
* @var string the directory containing controller classes in the module.
*/
private $_controllerPath;
/**
* @var array child modules of this module
*/
private $_modules = [];
/**
* @var array components registered under this module
*/
private $_components = [];
/**
* Constructor.
* @param string $id the ID of this module
* @param Module $parent the parent module (if any)
* @param array $config name-value pairs that will be used to initialize the object properties
*/
public function __construct($id, $parent = null, $config = [])
{
$this->id = $id;
$this->module = $parent;
parent::__construct($config);
}
/**
* Getter magic method.
* This method is overridden to support accessing components
* like reading module properties.
* @param string $name component or property name
* @return mixed the named property value
*/
public function __get($name)
{
if ($this->hasComponent($name)) {
return $this->getComponent($name);
} else {
return parent::__get($name);
}
}
/**
* Checks if a property value is null.
* This method overrides the parent implementation by checking
* if the named component is loaded.
* @param string $name the property name or the event name
* @return boolean whether the property value is null
*/
public function __isset($name)
{
if ($this->hasComponent($name)) {
return $this->getComponent($name) !== null;
} else {
return parent::__isset($name);
}
}
/**
* Initializes the module.
* This method is called after the module is created and initialized with property values
* given in configuration. The default implementation will create a path alias using the module [[id]]
* and then call [[preloadComponents()]] to load components that are declared in [[preload]].
*
* If you override this method, please make sure you call the parent implementation.
*/
public function init()
{
if ($this->controllerNamespace === null) {
$class = get_class($this);
if (($pos = strrpos($class, '\\')) !== false) {
$this->controllerNamespace = substr($class, 0, $pos) . '\\controllers';
}
}
$this->preloadComponents();
}
/**
* Returns an ID that uniquely identifies this module among all modules within the current application.
* Note that if the module is an application, an empty string will be returned.
* @return string the unique ID of the module.
*/
public function getUniqueId()
{
return $this->module ? ltrim($this->module->getUniqueId() . '/' . $this->id, '/') : $this->id;
}
/**
* Returns the root directory of the module.
* It defaults to the directory containing the module class file.
* @return string the root directory of the module.
*/
public function getBasePath()
{
if ($this->_basePath === null) {
$class = new \ReflectionClass($this);
$this->_basePath = dirname($class->getFileName());
}
return $this->_basePath;
}
/**
* Sets the root directory of the module.
* This method can only be invoked at the beginning of the constructor.
* @param string $path the root directory of the module. This can be either a directory name or a path alias.
* @throws InvalidParamException if the directory does not exist.
*/
public function setBasePath($path)
{
$path = Yii::getAlias($path);
$p = realpath($path);
if ($p !== false && is_dir($p)) {
$this->_basePath = $p;
} else {
throw new InvalidParamException("The directory does not exist: $path");
}
}
/**
* Returns the directory that contains the controller classes.
* Defaults to "[[basePath]]/controllers".
* @return string the directory that contains the controller classes.
*/
public function getControllerPath()
{
if ($this->_controllerPath !== null) {
return $this->_controllerPath;
} else {
return $this->_controllerPath = $this->getBasePath() . DIRECTORY_SEPARATOR . 'controllers';
}
}
/**
* Sets the directory that contains the controller classes.
* @param string $path the directory that contains the controller classes.
* This can be either a directory name or a path alias.
* @throws InvalidParamException if the directory is invalid
*/
public function setControllerPath($path)
{
$this->_controllerPath = Yii::getAlias($path);
}
/**
* Returns the directory that contains the view files for this module.
* @return string the root directory of view files. Defaults to "[[basePath]]/view".
*/
public function getViewPath()
{
if ($this->_viewPath !== null) {
return $this->_viewPath;
} else {
return $this->_viewPath = $this->getBasePath() . DIRECTORY_SEPARATOR . 'views';
}
}
/**
* Sets the directory that contains the view files.
* @param string $path the root directory of view files.
* @throws InvalidParamException if the directory is invalid
*/
public function setViewPath($path)
{
$this->_viewPath = Yii::getAlias($path);
}
/**
* Returns the directory that contains layout view files for this module.
* @return string the root directory of layout files. Defaults to "[[viewPath]]/layouts".
*/
public function getLayoutPath()
{
if ($this->_layoutPath !== null) {
return $this->_layoutPath;
} else {
return $this->_layoutPath = $this->getViewPath() . DIRECTORY_SEPARATOR . 'layouts';
}
}
/**
* Sets the directory that contains the layout files.
* @param string $path the root directory of layout files.
* @throws InvalidParamException if the directory is invalid
*/
public function setLayoutPath($path)
{
$this->_layoutPath = Yii::getAlias($path);
}
/**
* Defines path aliases.
* This method calls [[Yii::setAlias()]] to register the path aliases.
* This method is provided so that you can define path aliases when configuring a module.
* @property array 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.
* @param array $aliases list of path aliases to be defined. The array keys are alias names
* (must start with '@') and the array values are the corresponding paths or aliases.
* For example,
*
* ~~~
* [
* '@models' => '@app/models', // an existing alias
* '@backend' => __DIR__ . '/../backend', // a directory
* ]
* ~~~
*/
public function setAliases($aliases)
{
foreach ($aliases as $name => $alias) {
Yii::setAlias($name, $alias);
}
}
/**
* Checks whether the child module of the specified ID exists.
* This method supports checking the existence of both child and grand child modules.
* @param string $id module ID. For grand child modules, use ID path relative to this module (e.g. `admin/content`).
* @return boolean whether the named module exists. Both loaded and unloaded modules
* are considered.
*/
public function hasModule($id)
{
if (($pos = strpos($id, '/')) !== false) {
// sub-module
$module = $this->getModule(substr($id, 0, $pos));
return $module === null ? false : $module->hasModule(substr($id, $pos + 1));
} else {
return isset($this->_modules[$id]);
}
}
/**
* Retrieves the child module of the specified ID.
* This method supports retrieving both child modules and grand child modules.
* @param string $id module ID (case-sensitive). To retrieve grand child modules,
* use ID path relative to this module (e.g. `admin/content`).
* @param boolean $load whether to load the module if it is not yet loaded.
* @return Module|null the module instance, null if the module does not exist.
* @see hasModule()
*/
public function getModule($id, $load = true)
{
if (($pos = strpos($id, '/')) !== false) {
// sub-module
$module = $this->getModule(substr($id, 0, $pos));
return $module === null ? null : $module->getModule(substr($id, $pos + 1), $load);
}
if (isset($this->_modules[$id])) {
if ($this->_modules[$id] instanceof Module) {
return $this->_modules[$id];
} elseif ($load) {
Yii::trace("Loading module: $id", __METHOD__);
return $this->_modules[$id] = Yii::createObject($this->_modules[$id], $id, $this);
}
}
return null;
}
/**
* Adds a sub-module to this module.
* @param string $id module ID
* @param Module|array|null $module the sub-module to be added to this module. This can
* be one of the followings:
*
* - a [[Module]] object
* - a configuration array: when [[getModule()]] is called initially, the array
* will be used to instantiate the sub-module
* - null: the named sub-module will be removed from this module
*/
public function setModule($id, $module)
{
if ($module === null) {
unset($this->_modules[$id]);
} else {
$this->_modules[$id] = $module;
}
}
/**
* Returns the sub-modules in this module.
* @param boolean $loadedOnly whether to return the loaded sub-modules only. If this is set false,
* then all sub-modules registered in this module will be returned, whether they are loaded or not.
* Loaded modules will be returned as objects, while unloaded modules as configuration arrays.
* @return array the modules (indexed by their IDs)
*/
public function getModules($loadedOnly = false)
{
if ($loadedOnly) {
$modules = [];
foreach ($this->_modules as $module) {
if ($module instanceof Module) {
$modules[] = $module;
}
}
return $modules;
} else {
return $this->_modules;
}
}
/**
* Registers sub-modules in the current module.
*
* Each sub-module should be specified as a name-value pair, where
* name refers to the ID of the module and value the module or a configuration
* array that can be used to create the module. In the latter case, [[Yii::createObject()]]
* will be used to create the module.
*
* If a new sub-module has the same ID as an existing one, the existing one will be overwritten silently.
*
* The following is an example for registering two sub-modules:
*
* ~~~
* [
* 'comment' => [
* 'class' => 'app\modules\comment\CommentModule',
* 'db' => 'db',
* ],
* 'booking' => ['class' => 'app\modules\booking\BookingModule'],
* ]
* ~~~
*
* @param array $modules modules (id => module configuration or instances)
*/
public function setModules($modules)
{
foreach ($modules as $id => $module) {
$this->_modules[$id] = $module;
}
}
/**
* Checks whether the named component exists.
* @param string $id component ID
* @return boolean whether the named component exists. Both loaded and unloaded components
* are considered.
*/
public function hasComponent($id)
{
return isset($this->_components[$id]);
}
/**
* Retrieves the named component.
* @param string $id component ID (case-sensitive)
* @param boolean $load whether to load the component if it is not yet loaded.
* @return Component|null the component instance, null if the component does not exist.
* @see hasComponent()
*/
public function getComponent($id, $load = true)
{
if (isset($this->_components[$id])) {
if ($this->_components[$id] instanceof Object) {
return $this->_components[$id];
} elseif ($load) {
return $this->_components[$id] = Yii::createObject($this->_components[$id]);
}
}
return null;
}
/**
* Registers a component with this module.
* @param string $id component ID
* @param Component|array|null $component the component to be registered with the module. This can
* be one of the followings:
*
* - a [[Component]] object
* - a configuration array: when [[getComponent()]] is called initially for this component, the array
* will be used to instantiate the component via [[Yii::createObject()]].
* - null: the named component will be removed from the module
*/
public function setComponent($id, $component)
{
if ($component === null) {
unset($this->_components[$id]);
} else {
$this->_components[$id] = $component;
}
}
/**
* Returns the registered components.
* @param boolean $loadedOnly whether to return the loaded components only. If this is set false,
* then all components specified in the configuration will be returned, whether they are loaded or not.
* Loaded components will be returned as objects, while unloaded components as configuration arrays.
* @return array the components (indexed by their IDs)
*/
public function getComponents($loadedOnly = false)
{
if ($loadedOnly) {
$components = [];
foreach ($this->_components as $component) {
if ($component instanceof Component) {
$components[] = $component;
}
}
return $components;
} else {
return $this->_components;
}
}
/**
* Registers a set of components in this module.
*
* Each component should be specified as a name-value pair, where
* name refers to the ID of the component and value the component or a configuration
* array that can be used to create the component. In the latter case, [[Yii::createObject()]]
* will be used to create the component.
*
* If a new component has the same ID as an existing one, the existing one will be overwritten silently.
*
* The following is an example for setting two components:
*
* ~~~
* [
* 'db' => [
* 'class' => 'yii\db\Connection',
* 'dsn' => 'sqlite:path/to/file.db',
* ],
* 'cache' => [
* 'class' => 'yii\caching\DbCache',
* 'db' => 'db',
* ],
* ]
* ~~~
*
* @param array $components components (id => component configuration or instance)
*/
public function setComponents($components)
{
foreach ($components as $id => $component) {
if (isset($this->_components[$id]['class']) && !isset($component['class'])) {
$component['class'] = $this->_components[$id]['class'];
}
$this->_components[$id] = $component;
}
}
/**
* Loads components that are declared in [[preload]].
* @throws InvalidConfigException if a component or module to be preloaded is unknown
*/
public function preloadComponents()
{
foreach ($this->preload as $id) {
if ($this->hasComponent($id)) {
$this->getComponent($id);
} elseif ($this->hasModule($id)) {
$this->getModule($id);
} else {
throw new InvalidConfigException("Unknown component or module: $id");
}
}
}
/**
* Runs a controller action specified by a route.
* This method parses the specified route and creates the corresponding child module(s), controller and action
* instances. It then calls [[Controller::runAction()]] to run the action with the given parameters.
* If the route is empty, the method will use [[defaultRoute]].
* @param string $route the route that specifies the action.
* @param array $params the parameters to be passed to the action
* @return mixed the result of the action.
* @throws InvalidRouteException if the requested route cannot be resolved into an action successfully
*/
public function runAction($route, $params = [])
{
$parts = $this->createController($route);
if (is_array($parts)) {
/** @var Controller $controller */
list($controller, $actionID) = $parts;
$oldController = Yii::$app->controller;
Yii::$app->controller = $controller;
$result = $controller->runAction($actionID, $params);
Yii::$app->controller = $oldController;
return $result;
} else {
throw new InvalidRouteException('Unable to resolve the request "' . trim($this->getUniqueId() . '/' . $route, '/') . '".');
}
}
/**
* Creates a controller instance based on the controller ID.
*
* The controller is created within this module. The method first attempts to
* create the controller based on the [[controllerMap]] of the module. If not available,
* it will look for the controller class under the [[controllerPath]] and create an
* instance of it.
*
* @param string $route the route consisting of module, controller and action IDs.
* @return array|boolean If the controller is created successfully, it will be returned together
* with the requested action ID. Otherwise false will be returned.
* @throws InvalidConfigException if the controller class and its file do not match.
*/
public function createController($route)
{
if ($route === '') {
$route = $this->defaultRoute;
}
if (($pos = strpos($route, '/')) !== false) {
$id = substr($route, 0, $pos);
$route = substr($route, $pos + 1);
} else {
$id = $route;
$route = '';
}
$module = $this->getModule($id);
if ($module !== null) {
return $module->createController($route);
}
if (isset($this->controllerMap[$id])) {
$controller = Yii::createObject($this->controllerMap[$id], $id, $this);
} elseif (preg_match('/^[a-z0-9\\-_]+$/', $id)) {
$className = str_replace(' ', '', ucwords(str_replace('-', ' ', $id))) . 'Controller';
$classFile = $this->controllerPath . DIRECTORY_SEPARATOR . $className . '.php';
if (!is_file($classFile)) {
return false;
}
$className = ltrim($this->controllerNamespace . '\\' . $className, '\\');
Yii::$classMap[$className] = $classFile;
if (is_subclass_of($className, 'yii\base\Controller')) {
$controller = new $className($id, $this);
} elseif (YII_DEBUG) {
throw new InvalidConfigException("Controller class must extend from \\yii\\base\\Controller.");
}
}
return isset($controller) ? [$controller, $route] : false;
}
/**
* This method is invoked right before an action of this module is to be executed (after all possible filters.)
* You may override this method to do last-minute preparation for the action.
* Make sure you call the parent implementation so that the relevant event is triggered.
* @param Action $action the action to be executed.
* @return boolean whether the action should continue to be executed.
*/
public function beforeAction($action)
{
return true;
}
/**
* This method is invoked right after an action of this module has been executed.
* You may override this method to do some postprocessing for the action.
* Make sure you call the parent implementation so that the relevant event is triggered.
* @param Action $action the action just executed.
* @param mixed $result the action return result.
*/
public function afterAction($action, &$result)
{
}
}