--- /dev/null
+<?php
+
+/**
+ * @file
+ * Hooks and documentation related to the routing system.
+ */
+
+/**
+ * @defgroup routing Routing API
+ * @{
+ * Route page requests to code based on URLs.
+ *
+ * @section sec_overview Overview and terminology
+ * The Drupal routing system defines how Drupal responds to URL requests that
+ * the web server passes on to Drupal. The routing system is based on the
+ * @link http://symfony.com Symfony framework. @endlink The central idea is
+ * that Drupal subsystems and modules can register routes (basically, URL
+ * paths and context); they can also register to respond dynamically to
+ * routes, for more flexibility. When Drupal receives a URL request, it will
+ * attempt to match the request to a registered route, and query dynamic
+ * responders. If a match is made, Drupal will then instantiate the required
+ * classes, gather the data, format it, and send it back to the web browser.
+ * Otherwise, Drupal will return a 404 or 403 response.
+ *
+ * The following sections of this topic provide an overview of the routing API.
+ * For more detailed information, see
+ * https://www.drupal.org/developing/api/8/routing
+ *
+ * @section sec_register Registering simple routes
+ * To register a route, add lines similar to this to a module_name.routing.yml
+ * file in your top-level module directory:
+ * @code
+ * dblog.overview:
+ * path: '/admin/reports/dblog'
+ * defaults:
+ * _controller: '\Drupal\dblog\Controller\DbLogController::overview'
+ * _title: 'Recent log messages'
+ * requirements:
+ * _permission: 'access site reports'
+ * @endcode
+ * Some notes:
+ * - The first line is the machine name of the route. Typically, it is prefixed
+ * by the machine name of the module that defines the route, or the name of
+ * a subsystem.
+ * - The 'path' line gives the URL path of the route (relative to the site's
+ * base URL). Generally, paths in Drupal are treated as case-insensitive,
+ * which overrides the default Symfony behavior. Specifically:
+ * - If different routes are defined for /example and /EXAmplE, the exact
+ * match is respected.
+ * - If there is no exact match, the route falls back to a case-insensitive
+ * match, so /example and /EXAmplE will return the same page.
+ * Relying on case-sensitive path matching is not recommended because it
+ * negatively affects user experience, and path aliases do not support case-
+ * sensitive matches. The case-sensitive exact match is currently supported
+ * only for backwards compatibility and may be deprecated in a later release.
+ * - The 'defaults' section tells how to build the main content of the route,
+ * and can also give other information, such as the page title and additional
+ * arguments for the route controller method. There are several possibilities
+ * for how to build the main content, including:
+ * - _controller: A callable, usually a method on a page controller class
+ * (see @ref sec_controller below for details).
+ * - _form: A form controller class. See the
+ * @link form_api Form API topic @endlink for more information about
+ * form controllers.
+ * - _entity_form: A form for editing an entity. See the
+ * @link entity_api Entity API topic @endlink for more information.
+ * - The 'requirements' section is used in Drupal to give access permission
+ * instructions (it has other uses in the Symfony framework). Most
+ * routes have a simple permission-based access scheme, as shown in this
+ * example. See the @link user_api Permission system topic @endlink for
+ * more information about permissions.
+ *
+ * See https://www.drupal.org/node/2092643 for more details about *.routing.yml
+ * files, and https://www.drupal.org/node/2122201 for information on how to
+ * set up dynamic routes. The @link events Events topic @endlink is also
+ * relevant to dynamic routes.
+ *
+ * @section sec_placeholders Defining routes with placeholders
+ * Some routes have placeholders in them, and these can also be defined in a
+ * module_name.routing.yml file, as in this example from the Block module:
+ * @code
+ * entity.block.edit_form:
+ * path: '/admin/structure/block/manage/{block}'
+ * defaults:
+ * _entity_form: 'block.default'
+ * _title: 'Configure block'
+ * requirements:
+ * _entity_access: 'block.update'
+ * @endcode
+ * In the path, '{block}' is a placeholder - it will be replaced by the
+ * ID of the block that is being configured by the entity system. See the
+ * @link entity_api Entity API topic @endlink for more information.
+ *
+ * @section sec_controller Route controllers for simple routes
+ * For simple routes, after you have defined the route in a *.routing.yml file
+ * (see @ref sec_register above), the next step is to define a page controller
+ * class and method. Page controller classes do not necessarily need to
+ * implement any particular interface or extend any particular base class. The
+ * only requirement is that the method specified in your *.routing.yml file
+ * returns:
+ * - A render array (see the
+ * @link theme_render Theme and render topic @endlink for more information).
+ * This render array is then rendered in the requested format (HTML, dialog,
+ * modal, AJAX are supported by default). In the case of HTML, it will be
+ * surrounded by blocks by default: the Block module is enabled by default,
+ * and hence its Page Display Variant that surrounds the main content with
+ * blocks is also used by default.
+ * - A \Symfony\Component\HttpFoundation\Response object.
+ * As a note, if your module registers multiple simple routes, it is usual
+ * (and usually easiest) to put all of their methods on one controller class.
+ *
+ * If the route has placeholders (see @ref sec_placeholders above) the
+ * placeholders will be passed to the method (using reflection) by name.
+ * For example, the placeholder '{myvar}' in a route will become the $myvar
+ * parameter to the method.
+ *
+ * Additionally, if a parameter is typed to one of the following special classes
+ * the system will pass those values as well.
+ *
+ * - \Symfony\Component\HttpFoundation\Request: The raw Symfony request object.
+ * It is generally only useful if the controller needs access to the query
+ * parameters of the request. By convention, this parameter is usually named
+ * $request.
+ * - \Psr\Http\Message\ServerRequestInterface: The raw request, represented
+ * using the PSR-7 ServerRequest format. This object is derived as necessary
+ * from the Symfony request, so if either will suffice the Symfony request
+ * will be slightly more performant. By convention this parameter is usually
+ * named $request.
+ * - \Drupal\Core\Routing\RouteMatchInterface: The "route match" data from
+ * this request. This object contains various standard data derived from
+ * the request and routing process. Consult the interface for details.
+ *
+ * Most controllers will need to display some information stored in the Drupal
+ * database, which will involve using one or more Drupal services (see the
+ * @link container Services and container topic @endlink). In order to properly
+ * inject services, a controller should implement
+ * \Drupal\Core\DependencyInjection\ContainerInjectionInterface; simple
+ * controllers can do this by extending the
+ * \Drupal\Core\Controller\ControllerBase class. See
+ * \Drupal\dblog\Controller\DbLogController for a straightforward example of
+ * a controller class.
+ *
+ * @}
+ */
projects / yaffs-website / blobdiff