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<?php
namespace Drupal\Core\Extension;
/**
* Interface for classes that manage a set of enabled modules.
*
* Classes implementing this interface work with a fixed list of modules and are
* responsible for loading module files and maintaining information about module
* dependencies and hook implementations.
*/
interface ModuleHandlerInterface {
/**
* Includes a module's .module file.
*
* This prevents including a module more than once.
*
* @param string $name
* The name of the module to load.
*
* @return bool
* TRUE if the item is loaded or has already been loaded.
*/
public function load($name);
/**
* Loads all enabled modules.
*/
public function loadAll();
/**
* Returns whether all modules have been loaded.
*
* @return bool
* A Boolean indicating whether all modules have been loaded. This means all
* modules; the load status of bootstrap modules cannot be checked.
*/
public function isLoaded();
/**
* Reloads all enabled modules.
*/
public function reload();
/**
* Returns the list of currently active modules.
* @return \Drupal\Core\Extension\Extension[]
* An associative array whose keys are the names of the modules and whose
* values are Extension objects.
*/
public function getModuleList();
/**
* Returns a module extension object from the currently active modules list.
*
* @param string $name
* The name of the module to return.
*
* @return \Drupal\Core\Extension\Extension
* An extension object.
*
* @throws \InvalidArgumentException
* Thrown when the requested module does not exist.
*/
public function getModule($name);
* Sets an explicit list of currently active modules.
* @param \Drupal\Core\Extension\Extension[] $module_list
* An associative array whose keys are the names of the modules and whose
* values are Extension objects.
public function setModuleList(array $module_list = []);
/**
* Adds a module to the list of currently active modules.
*
* @param string $name
* The module name; e.g., 'node'.
* @param string $path
* The module path; e.g., 'core/modules/node'.
*/
public function addModule($name, $path);
/**
* Adds an installation profile to the list of currently active modules.
*
* @param string $name
* The profile name; e.g., 'standard'.
* @param string $path
* The profile path; e.g., 'core/profiles/standard'.
*/
public function addProfile($name, $path);
/**
* Determines which modules require and are required by each module.
*
* @param array $modules
* An array of module objects keyed by module name. Each object contains
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* information discovered during a Drupal\Core\Extension\ExtensionDiscovery
* scan.
*
* @return
* The same array with the new keys for each module:
* - requires: An array with the keys being the modules that this module
* requires.
* - required_by: An array with the keys being the modules that will not work
* without this module.
*
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* @see \Drupal\Core\Extension\ExtensionDiscovery
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*/
public function buildModuleDependencies(array $modules);
/**
* Determines whether a given module is enabled.
*
* @param string $module
* The name of the module (without the .module extension).
*
* @return bool
* TRUE if the module is both installed and enabled.
*/
public function moduleExists($module);
/**
* Loads an include file for each enabled module.
*
* @param string $type
* The include file's type (file extension).
* @param string $name
* (optional) The base file name (without the $type extension). If omitted,
* each module's name is used; i.e., "$module.$type" by default.
*/
public function loadAllIncludes($type, $name = NULL);
/**
* Loads a module include file.
*
* Examples:
* @code
* // Load node.admin.inc from the node module.
* $this->loadInclude('node', 'inc', 'node.admin');
* // Load content_types.inc from the node module.
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* $this->loadInclude('node', 'inc', 'content_types');
* @endcode
*
* @param string $module
* The module to which the include file belongs.
* @param string $type
* The include file's type (file extension).
* @param string $name
* (optional) The base file name (without the $type extension). If omitted,
* $module is used; i.e., resulting in "$module.$type" by default.
*
* @return string|false
* The name of the included file, if successful; FALSE otherwise.
*/
public function loadInclude($module, $type, $name = NULL);
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/**
* Retrieves a list of hooks that are declared through hook_hook_info().
*
* @return array
* An associative array whose keys are hook names and whose values are an
* associative array containing a group name. The structure of the array
* is the same as the return value of hook_hook_info().
*
* @see hook_hook_info()
*/
public function getHookInfo();
/**
* Determines which modules are implementing a hook.
*
* @param string $hook
* The name of the hook (e.g. "help" or "menu").
*
* @return array
* An array with the names of the modules which are implementing this hook.
*/
public function getImplementations($hook);
/**
* Write the hook implementation info to the cache.
*/
public function writeCache();
/**
* Resets the cached list of hook implementations.
*/
public function resetImplementations();
/**
* Returns whether a given module implements a given hook.
*
* @param string $module
* The name of the module (without the .module extension).
* @param string $hook
* The name of the hook (e.g. "help" or "menu").
*
* @return bool
* TRUE if the module is both installed and enabled, and the hook is
* implemented in that module.
*/
public function implementsHook($module, $hook);
/**
* Invokes a hook in a particular module.
*
* @param string $module
* The name of the module (without the .module extension).
* @param string $hook
* The name of the hook to invoke.
* @param array $args
* Arguments to pass to the hook implementation.
*
* @return mixed
* The return value of the hook implementation.
*/
public function invoke($module, $hook, array $args = []);
/**
* Invokes a hook in all enabled modules that implement it.
*
* @param string $hook
* The name of the hook to invoke.
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* @param array $args
* Arguments to pass to the hook.
*
* @return array
* An array of return values of the hook implementations. If modules return
* arrays from their implementations, those are merged into one array
* recursively. Note: integer keys in arrays will be lost, as the merge is
* done using array_merge_recursive().
public function invokeAll($hook, array $args = []);
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/**
* Passes alterable variables to specific hook_TYPE_alter() implementations.
*
* This dispatch function hands off the passed-in variables to type-specific
* hook_TYPE_alter() implementations in modules. It ensures a consistent
* interface for all altering operations.
*
* A maximum of 2 alterable arguments is supported. In case more arguments need
* to be passed and alterable, modules provide additional variables assigned by
* reference in the last $context argument:
* @code
* $context = array(
* 'alterable' => &$alterable,
* 'unalterable' => $unalterable,
* 'foo' => 'bar',
* );
* $this->alter('mymodule_data', $alterable1, $alterable2, $context);
* @endcode
*
* Note that objects are always passed by reference in PHP5. If it is absolutely
* required that no implementation alters a passed object in $context, then an
* object needs to be cloned:
* @code
* $context = array(
* 'unalterable_object' => clone $object,
* );
* $this->alter('mymodule_data', $data, $context);
* @endcode
*
* @param string|array $type
* A string describing the type of the alterable $data. 'form', 'links',
* 'node_content', and so on are several examples. Alternatively can be an
* array, in which case hook_TYPE_alter() is invoked for each value in the
* array, ordered first by module, and then for each module, in the order of
* values in $type. For example, when Form API is using $this->alter() to
* execute both hook_form_alter() and hook_form_FORM_ID_alter()
* implementations, it passes array('form', 'form_' . $form_id) for $type.
* @param mixed $data
* The variable that will be passed to hook_TYPE_alter() implementations to be
* altered. The type of this variable depends on the value of the $type
* argument. For example, when altering a 'form', $data will be a structured
* array. When altering a 'profile', $data will be an object.
* @param mixed $context1
* (optional) An additional variable that is passed by reference.
* @param mixed $context2
* (optional) An additional variable that is passed by reference. If more
* context needs to be provided to implementations, then this should be an
* associative array as described above.
*/
public function alter($type, &$data, &$context1 = NULL, &$context2 = NULL);
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/**
* Returns an array of directories for all enabled modules. Useful for
* tasks such as finding a file that exists in all module directories.
*
* @return array
*/
public function getModuleDirectories();
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/**
* Gets the human readable name of a given module.
*
* @param string $module
* The machine name of the module which title should be shown.
*
* @return string
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* Returns the human readable name of the module or the machine name passed
* in if no matching module is found.
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*/
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public function getName($module);
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