corpus_parole: comparison cms/drupal/includes/module.inc

equal deleted inserted replaced

-:07239de796bb
+:e756a8c72c3d
+<?php
+/**
+* @file
+* API for loading and interacting with Drupal modules.
+*/
+/**
+* Loads all the modules that have been enabled in the system table.
+*
+* @param $bootstrap
+*   Whether to load only the reduced set of modules loaded in "bootstrap mode"
+*   for cached pages. See bootstrap.inc.
+*
+* @return
+*   If $bootstrap is NULL, return a boolean indicating whether all modules
+*   have been loaded.
+*/
+function module_load_all($bootstrap = FALSE) {
+static $has_run = FALSE;
+if (isset($bootstrap)) {
+foreach (module_list(TRUE, $bootstrap) as $module) {
+drupal_load('module', $module);
+}
+// $has_run will be TRUE if $bootstrap is FALSE.
+$has_run = !$bootstrap;
+}
+return $has_run;
+}
+/**
+* Returns a list of currently active modules.
+*
+* Usually, this returns a list of all enabled modules. When called early on in
+* the bootstrap, it will return a list of vital modules only (those needed to
+* generate cached pages).
+*
+* All parameters to this function are optional and should generally not be
+* changed from their defaults.
+*
+* @param $refresh
+*   (optional) Whether to force the module list to be regenerated (such as
+*   after the administrator has changed the system settings). Defaults to
+*   FALSE.
+* @param $bootstrap_refresh
+*   (optional) When $refresh is TRUE, setting $bootstrap_refresh to TRUE forces
+*   the module list to be regenerated using the reduced set of modules loaded
+*   in "bootstrap mode" for cached pages. Otherwise, setting $refresh to TRUE
+*   generates the complete list of enabled modules.
+* @param $sort
+*   (optional) By default, modules are ordered by weight and module name. Set
+*   this option to TRUE to return a module list ordered only by module name.
+* @param $fixed_list
+*   (optional) If an array of module names is provided, this will override the
+*   module list with the given set of modules. This will persist until the next
+*   call with $refresh set to TRUE or with a new $fixed_list passed in. This
+*   parameter is primarily intended for internal use (e.g., in install.php and
+*   update.php).
+*
+* @return
+*   An associative array whose keys and values are the names of the modules in
+*   the list.
+*/
+function module_list($refresh = FALSE, $bootstrap_refresh = FALSE, $sort = FALSE, $fixed_list = NULL) {
+static $list = array(), $sorted_list;
+if (empty($list) || $refresh || $fixed_list) {
+$list = array();
+$sorted_list = NULL;
+if ($fixed_list) {
+foreach ($fixed_list as $name => $module) {
+drupal_get_filename('module', $name, $module['filename']);
+$list[$name] = $name;
+}
+}
+else {
+if ($refresh) {
+// For the $refresh case, make sure that system_list() returns fresh
+// data.
+drupal_static_reset('system_list');
+}
+if ($bootstrap_refresh) {
+$list = system_list('bootstrap');
+}
+else {
+// Not using drupal_map_assoc() here as that requires common.inc.
+$list = array_keys(system_list('module_enabled'));
+$list = (!empty($list) ? array_combine($list, $list) : array());
+}
+}
+}
+if ($sort) {
+if (!isset($sorted_list)) {
+$sorted_list = $list;
+ksort($sorted_list);
+}
+return $sorted_list;
+}
+return $list;
+}
+/**
+* Builds a list of bootstrap modules and enabled modules and themes.
+*
+* @param $type
+*   The type of list to return:
+*   - module_enabled: All enabled modules.
+*   - bootstrap: All enabled modules required for bootstrap.
+*   - theme: All themes.
+*
+* @return
+*   An associative array of modules or themes, keyed by name. For $type
+*   'bootstrap', the array values equal the keys. For $type 'module_enabled'
+*   or 'theme', the array values are objects representing the respective
+*   database row, with the 'info' property already unserialized.
+*
+* @see module_list()
+* @see list_themes()
+*/
+function system_list($type) {
+$lists = &drupal_static(__FUNCTION__);
+// For bootstrap modules, attempt to fetch the list from cache if possible.
+// if not fetch only the required information to fire bootstrap hooks
+// in case we are going to serve the page from cache.
+if ($type == 'bootstrap') {
+if (isset($lists['bootstrap'])) {
+return $lists['bootstrap'];
+}
+if ($cached = cache_get('bootstrap_modules', 'cache_bootstrap')) {
+$bootstrap_list = $cached->data;
+}
+else {
+$bootstrap_list = db_query("SELECT name, filename FROM {system} WHERE status = 1 AND bootstrap = 1 AND type = 'module' ORDER BY weight ASC, name ASC")->fetchAllAssoc('name');
+cache_set('bootstrap_modules', $bootstrap_list, 'cache_bootstrap');
+}
+// To avoid a separate database lookup for the filepath, prime the
+// drupal_get_filename() static cache for bootstrap modules only.
+// The rest is stored separately to keep the bootstrap module cache small.
+foreach ($bootstrap_list as $module) {
+drupal_get_filename('module', $module->name, $module->filename);
+}
+// We only return the module names here since module_list() doesn't need
+// the filename itself.
+$lists['bootstrap'] = array_keys($bootstrap_list);
+}
+// Otherwise build the list for enabled modules and themes.
+elseif (!isset($lists['module_enabled'])) {
+if ($cached = cache_get('system_list', 'cache_bootstrap')) {
+$lists = $cached->data;
+}
+else {
+$lists = array(
+'module_enabled' => array(),
+'theme' => array(),
+'filepaths' => array(),
+);
+// The module name (rather than the filename) is used as the fallback
+// weighting in order to guarantee consistent behavior across different
+// Drupal installations, which might have modules installed in different
+// locations in the file system. The ordering here must also be
+// consistent with the one used in module_implements().
+$result = db_query("SELECT * FROM {system} WHERE type = 'theme' OR (type = 'module' AND status = 1) ORDER BY weight ASC, name ASC");
+foreach ($result as $record) {
+$record->info = unserialize($record->info);
+// Build a list of all enabled modules.
+if ($record->type == 'module') {
+$lists['module_enabled'][$record->name] = $record;
+}
+// Build a list of themes.
+if ($record->type == 'theme') {
+$lists['theme'][$record->name] = $record;
+}
+// Build a list of filenames so drupal_get_filename can use it.
+if ($record->status) {
+$lists['filepaths'][] = array('type' => $record->type, 'name' => $record->name, 'filepath' => $record->filename);
+}
+}
+foreach ($lists['theme'] as $key => $theme) {
+if (!empty($theme->info['base theme'])) {
+// Make a list of the theme's base themes.
+require_once DRUPAL_ROOT . '/includes/theme.inc';
+$lists['theme'][$key]->base_themes = drupal_find_base_themes($lists['theme'], $key);
+// Don't proceed if there was a problem with the root base theme.
+if (!current($lists['theme'][$key]->base_themes)) {
+continue;
+}
+// Determine the root base theme.
+$base_key = key($lists['theme'][$key]->base_themes);
+// Add to the list of sub-themes for each of the theme's base themes.
+foreach (array_keys($lists['theme'][$key]->base_themes) as $base_theme) {
+$lists['theme'][$base_theme]->sub_themes[$key] = $lists['theme'][$key]->info['name'];
+}
+// Add the base theme's theme engine info.
+$lists['theme'][$key]->info['engine'] = isset($lists['theme'][$base_key]->info['engine']) ? $lists['theme'][$base_key]->info['engine'] : 'theme';
+}
+else {
+// A plain theme is its own engine.
+$base_key = $key;
+if (!isset($lists['theme'][$key]->info['engine'])) {
+$lists['theme'][$key]->info['engine'] = 'theme';
+}
+}
+// Set the theme engine prefix.
+$lists['theme'][$key]->prefix = ($lists['theme'][$key]->info['engine'] == 'theme') ? $base_key : $lists['theme'][$key]->info['engine'];
+}
+cache_set('system_list', $lists, 'cache_bootstrap');
+}
+// To avoid a separate database lookup for the filepath, prime the
+// drupal_get_filename() static cache with all enabled modules and themes.
+foreach ($lists['filepaths'] as $item) {
+drupal_get_filename($item['type'], $item['name'], $item['filepath']);
+}
+}
+return $lists[$type];
+}
+/**
+* Resets all system_list() caches.
+*/
+function system_list_reset() {
+drupal_static_reset('system_list');
+drupal_static_reset('system_rebuild_module_data');
+drupal_static_reset('list_themes');
+cache_clear_all('bootstrap_modules', 'cache_bootstrap');
+cache_clear_all('system_list', 'cache_bootstrap');
+// Clean up the bootstrap file scan cache.
+drupal_static_reset('_drupal_file_scan_cache');
+cache_clear_all('_drupal_file_scan_cache', 'cache_bootstrap');
+}
+/**
+* Determines which modules require and are required by each module.
+*
+* @param $files
+*   The array of filesystem objects used to rebuild the cache.
+*
+* @return
+*   The same array with the new keys for each module:
+*   - requires: An array with the keys being the modules that this module
+*     requires.
+*   - required_by: An array with the keys being the modules that will not work
+*     without this module.
+*/
+function _module_build_dependencies($files) {
+require_once DRUPAL_ROOT . '/includes/graph.inc';
+foreach ($files as $filename => $file) {
+$graph[$file->name]['edges'] = array();
+if (isset($file->info['dependencies']) && is_array($file->info['dependencies'])) {
+foreach ($file->info['dependencies'] as $dependency) {
+$dependency_data = drupal_parse_dependency($dependency);
+$graph[$file->name]['edges'][$dependency_data['name']] = $dependency_data;
+}
+}
+}
+drupal_depth_first_search($graph);
+foreach ($graph as $module => $data) {
+$files[$module]->required_by = isset($data['reverse_paths']) ? $data['reverse_paths'] : array();
+$files[$module]->requires = isset($data['paths']) ? $data['paths'] : array();
+$files[$module]->sort = $data['weight'];
+}
+return $files;
+}
+/**
+* Determines whether a given module exists.
+*
+* @param string $module
+*   The name of the module (without the .module extension).
+*
+* @return bool
+*   TRUE if the module is both installed and enabled, FALSE otherwise.
+*/
+function module_exists($module) {
+$list = module_list();
+return isset($list[$module]);
+}
+/**
+* Loads a module's installation hooks.
+*
+* @param $module
+*   The name of the module (without the .module extension).
+*
+* @return
+*   The name of the module's install file, if successful; FALSE otherwise.
+*/
+function module_load_install($module) {
+// Make sure the installation API is available
+include_once DRUPAL_ROOT . '/includes/install.inc';
+return module_load_include('install', $module);
+}
+/**
+* Loads a module include file.
+*
+* Examples:
+* @code
+*   // Load node.admin.inc from the node module.
+*   module_load_include('inc', 'node', 'node.admin');
+*   // Load content_types.inc from the node module.
+*   module_load_include('inc', 'node', 'content_types');
+* @endcode
+*
+* Do not use this function to load an install file, use module_load_install()
+* instead. Do not use this function in a global context since it requires
+* Drupal to be fully bootstrapped, use require_once DRUPAL_ROOT . '/path/file'
+* instead.
+*
+* @param $type
+*   The include file's type (file extension).
+* @param $module
+*   The module to which the include file belongs.
+* @param $name
+*   (optional) The base file name (without the $type extension). If omitted,
+*   $module is used; i.e., resulting in "$module.$type" by default.
+*
+* @return
+*   The name of the included file, if successful; FALSE otherwise.
+*/
+function module_load_include($type, $module, $name = NULL) {
+static $files = array();
+if (!isset($name)) {
+$name = $module;
+}
+$key = $type . ':' . $module . ':' . $name;
+if (isset($files[$key])) {
+return $files[$key];
+}
+if (function_exists('drupal_get_path')) {
+$file = DRUPAL_ROOT . '/' . drupal_get_path('module', $module) . "/$name.$type";
+if (is_file($file)) {
+require_once $file;
+$files[$key] = $file;
+return $file;
+}
+else {
+$files[$key] = FALSE;
+}
+}
+return FALSE;
+}
+/**
+* Loads an include file for each module enabled in the {system} table.
+*/
+function module_load_all_includes($type, $name = NULL) {
+$modules = module_list();
+foreach ($modules as $module) {
+module_load_include($type, $module, $name);
+}
+}
+/**
+* Enables or installs a given list of modules.
+*
+* Definitions:
+* - "Enabling" is the process of activating a module for use by Drupal.
+* - "Disabling" is the process of deactivating a module.
+* - "Installing" is the process of enabling it for the first time or after it
+*   has been uninstalled.
+* - "Uninstalling" is the process of removing all traces of a module.
+*
+* Order of events:
+* - Gather and add module dependencies to $module_list (if applicable).
+* - For each module that is being enabled:
+*   - Install module schema and update system registries and caches.
+*   - If the module is being enabled for the first time or had been
+*     uninstalled, invoke hook_install() and add it to the list of installed
+*     modules.
+*   - Invoke hook_enable().
+* - Invoke hook_modules_installed().
+* - Invoke hook_modules_enabled().
+*
+* @param string[] $module_list
+*   An array of module names.
+* @param bool $enable_dependencies
+*   If TRUE, dependencies will automatically be added and enabled in the
+*   correct order. This incurs a significant performance cost, so use FALSE
+*   if you know $module_list is already complete and in the correct order.
+*
+* @return bool
+*   FALSE if one or more dependencies are missing, TRUE otherwise.
+*
+* @see hook_install()
+* @see hook_enable()
+* @see hook_modules_installed()
+* @see hook_modules_enabled()
+* @see module_disable()
+* @see drupal_uninstall_modules()
+*/
+function module_enable($module_list, $enable_dependencies = TRUE) {
+if ($enable_dependencies) {
+// Get all module data so we can find dependencies and sort.
+$module_data = system_rebuild_module_data();
+// Create an associative array with weights as values.
+$module_list = array_flip(array_values($module_list));
+while (list($module) = each($module_list)) {
+if (!isset($module_data[$module])) {
+// This module is not found in the filesystem, abort.
+return FALSE;
+}
+if ($module_data[$module]->status) {
+// Skip already enabled modules.
+unset($module_list[$module]);
+continue;
+}
+$module_list[$module] = $module_data[$module]->sort;
+// Add dependencies to the list, with a placeholder weight.
+// The new modules will be processed as the while loop continues.
+foreach (array_keys($module_data[$module]->requires) as $dependency) {
+if (!isset($module_list[$dependency])) {
+$module_list[$dependency] = 0;
+}
+}
+}
+if (!$module_list) {
+// Nothing to do. All modules already enabled.
+return TRUE;
+}
+// Sort the module list by pre-calculated weights.
+arsort($module_list);
+$module_list = array_keys($module_list);
+}
+// Required for module installation checks.
+include_once DRUPAL_ROOT . '/includes/install.inc';
+$modules_installed = array();
+$modules_enabled = array();
+foreach ($module_list as $module) {
+// Only process modules that are not already enabled.
+$existing = db_query("SELECT status FROM {system} WHERE type = :type AND name = :name", array(
+':type' => 'module',
+':name' => $module))
+->fetchObject();
+if ($existing->status == 0) {
+// Load the module's code.
+drupal_load('module', $module);
+module_load_install($module);
+// Update the database and module list to reflect the new module. This
+// needs to be done first so that the module's hook implementations,
+// hook_schema() in particular, can be called while it is being
+// installed.
+db_update('system')
+->fields(array('status' => 1))
+->condition('type', 'module')
+->condition('name', $module)
+->execute();
+// Refresh the module list to include it.
+system_list_reset();
+module_list(TRUE);
+module_implements('', FALSE, TRUE);
+_system_update_bootstrap_status();
+// Update the registry to include it.
+registry_update();
+// Refresh the schema to include it.
+drupal_get_schema(NULL, TRUE);
+// Update the theme registry to include it.
+drupal_theme_rebuild();
+// Clear entity cache.
+entity_info_cache_clear();
+// Now install the module if necessary.
+if (drupal_get_installed_schema_version($module, TRUE) == SCHEMA_UNINSTALLED) {
+drupal_install_schema($module);
+// Set the schema version to the number of the last update provided
+// by the module.
+$versions = drupal_get_schema_versions($module);
+$version = $versions ? max($versions) : SCHEMA_INSTALLED;
+// If the module has no current updates, but has some that were
+// previously removed, set the version to the value of
+// hook_update_last_removed().
+if ($last_removed = module_invoke($module, 'update_last_removed')) {
+$version = max($version, $last_removed);
+}
+drupal_set_installed_schema_version($module, $version);
+// Allow the module to perform install tasks.
+module_invoke($module, 'install');
+// Record the fact that it was installed.
+$modules_installed[] = $module;
+watchdog('system', '%module module installed.', array('%module' => $module), WATCHDOG_INFO);
+}
+// Enable the module.
+module_invoke($module, 'enable');
+// Record the fact that it was enabled.
+$modules_enabled[] = $module;
+watchdog('system', '%module module enabled.', array('%module' => $module), WATCHDOG_INFO);
+}
+}
+// If any modules were newly installed, invoke hook_modules_installed().
+if (!empty($modules_installed)) {
+module_invoke_all('modules_installed', $modules_installed);
+}
+// If any modules were newly enabled, invoke hook_modules_enabled().
+if (!empty($modules_enabled)) {
+module_invoke_all('modules_enabled', $modules_enabled);
+}
+return TRUE;
+}
+/**
+* Disables a given set of modules.
+*
+* @param string[] $module_list
+*   An array of module names.
+* @param bool $disable_dependents
+*   If TRUE, dependent modules will automatically be added and disabled in the
+*   correct order. This incurs a significant performance cost, so use FALSE
+*   if you know $module_list is already complete and in the correct order.
+*
+* @see drupal_uninstall_modules()
+* @see module_enable()
+*/
+function module_disable($module_list, $disable_dependents = TRUE) {
+if ($disable_dependents) {
+// Get all module data so we can find dependents and sort.
+$module_data = system_rebuild_module_data();
+// Create an associative array with weights as values.
+$module_list = array_flip(array_values($module_list));
+$profile = drupal_get_profile();
+while (list($module) = each($module_list)) {
+if (!isset($module_data[$module]) || !$module_data[$module]->status) {
+// This module doesn't exist or is already disabled, skip it.
+unset($module_list[$module]);
+continue;
+}
+$module_list[$module] = $module_data[$module]->sort;
+// Add dependent modules to the list, with a placeholder weight.
+// The new modules will be processed as the while loop continues.
+foreach ($module_data[$module]->required_by as $dependent => $dependent_data) {
+if (!isset($module_list[$dependent]) && $dependent != $profile) {
+$module_list[$dependent] = 0;
+}
+}
+}
+// Sort the module list by pre-calculated weights.
+asort($module_list);
+$module_list = array_keys($module_list);
+}
+$invoke_modules = array();
+foreach ($module_list as $module) {
+if (module_exists($module)) {
+// Check if node_access table needs rebuilding.
+if (!node_access_needs_rebuild() && module_hook($module, 'node_grants')) {
+node_access_needs_rebuild(TRUE);
+}
+module_load_install($module);
+module_invoke($module, 'disable');
+db_update('system')
+->fields(array('status' => 0))
+->condition('type', 'module')
+->condition('name', $module)
+->execute();
+$invoke_modules[] = $module;
+watchdog('system', '%module module disabled.', array('%module' => $module), WATCHDOG_INFO);
+}
+}
+if (!empty($invoke_modules)) {
+// Refresh the module list to exclude the disabled modules.
+system_list_reset();
+module_list(TRUE);
+module_implements('', FALSE, TRUE);
+entity_info_cache_clear();
+// Invoke hook_modules_disabled before disabling modules,
+// so we can still call module hooks to get information.
+module_invoke_all('modules_disabled', $invoke_modules);
+// Update the registry to remove the newly-disabled module.
+registry_update();
+_system_update_bootstrap_status();
+// Update the theme registry to remove the newly-disabled module.
+drupal_theme_rebuild();
+}
+// If there remains no more node_access module, rebuilding will be
+// straightforward, we can do it right now.
+if (node_access_needs_rebuild() && count(module_implements('node_grants')) == 0) {
+node_access_rebuild();
+}
+}
+/**
+* @defgroup hooks Hooks
+* @{
+* Allow modules to interact with the Drupal core.
+*
+* Drupal's module system is based on the concept of "hooks". A hook is a PHP
+* function that is named foo_bar(), where "foo" is the name of the module
+* (whose filename is thus foo.module) and "bar" is the name of the hook. Each
+* hook has a defined set of parameters and a specified result type.
+*
+* To extend Drupal, a module need simply implement a hook. When Drupal wishes
+* to allow intervention from modules, it determines which modules implement a
+* hook and calls that hook in all enabled modules that implement it.
+*
+* The available hooks to implement are explained here in the Hooks section of
+* the developer documentation. The string "hook" is used as a placeholder for
+* the module name in the hook definitions. For example, if the module file is
+* called example.module, then hook_help() as implemented by that module would
+* be defined as example_help().
+*
+* The example functions included are not part of the Drupal core, they are
+* just models that you can modify. Only the hooks implemented within modules
+* are executed when running Drupal.
+*
+* @see themeable
+* @see callbacks
+*/
+/**
+* @defgroup callbacks Callbacks
+* @{
+* Callback function signatures.
+*
+* Drupal's API sometimes uses callback functions to allow you to define how
+* some type of processing happens. A callback is a function with a defined
+* signature, which you define in a module. Then you pass the function name as
+* a parameter to a Drupal API function or return it as part of a hook
+* implementation return value, and your function is called at an appropriate
+* time. For instance, when setting up batch processing you might need to
+* provide a callback function for each processing step and/or a callback for
+* when processing is finished; you would do that by defining these functions
+* and passing their names into the batch setup function.
+*
+* Callback function signatures, like hook definitions, are described by
+* creating and documenting dummy functions in a *.api.php file; normally, the
+* dummy callback function's name should start with "callback_", and you should
+* document the parameters and return value and provide a sample function body.
+* Then your API documentation can refer to this callback function in its
+* documentation. A user of your API can usually name their callback function
+* anything they want, although a standard name would be to replace "callback_"
+* with the module name.
+*
+* @see hooks
+* @see themeable
+*
+* @}
+*/
+/**
+* Determines whether a module implements a hook.
+*
+* @param $module
+*   The name of the module (without the .module extension).
+* @param $hook
+*   The name of the hook (e.g. "help" or "menu").
+*
+* @return
+*   TRUE if the module is both installed and enabled, and the hook is
+*   implemented in that module.
+*/
+function module_hook($module, $hook) {
+$function = $module . '_' . $hook;
+if (function_exists($function)) {
+return TRUE;
+}
+// If the hook implementation does not exist, check whether it may live in an
+// optional include file registered via hook_hook_info().
+$hook_info = module_hook_info();
+if (isset($hook_info[$hook]['group'])) {
+module_load_include('inc', $module, $module . '.' . $hook_info[$hook]['group']);
+if (function_exists($function)) {
+return TRUE;
+}
+}
+return FALSE;
+}
+/**
+* Determines which modules are implementing a hook.
+*
+* Lazy-loaded include files specified with "group" via hook_hook_info() or
+* hook_module_implements_alter() will be automatically included by this
+* function when necessary.
+*
+* @param string $hook
+*   The name of the hook (e.g. "help" or "menu").
+* @param bool $sort
+*   By default, modules are ordered by weight and filename, settings this option
+*   to TRUE, module list will be ordered by module name.
+* @param bool $reset
+*   For internal use only: Whether to force the stored list of hook
+*   implementations to be regenerated (such as after enabling a new module,
+*   before processing hook_enable).
+*
+* @return
+*   An array with the names of the modules which are implementing this hook.
+*
+* @see module_implements_write_cache()
+*/
+function module_implements($hook, $sort = FALSE, $reset = FALSE) {
+// Use the advanced drupal_static() pattern, since this is called very often.
+static $drupal_static_fast;
+if (!isset($drupal_static_fast)) {
+$drupal_static_fast['implementations'] = &drupal_static(__FUNCTION__);
+$drupal_static_fast['verified'] = &drupal_static(__FUNCTION__ . ':verified');
+}
+$implementations = &$drupal_static_fast['implementations'];
+$verified = &$drupal_static_fast['verified'];
+// We maintain a persistent cache of hook implementations in addition to the
+// static cache to avoid looping through every module and every hook on each
+// request. Benchmarks show that the benefit of this caching outweighs the
+// additional database hit even when using the default database caching
+// backend and only a small number of modules are enabled. The cost of the
+// cache_get() is more or less constant and reduced further when non-database
+// caching backends are used, so there will be more significant gains when a
+// large number of modules are installed or hooks invoked, since this can
+// quickly lead to module_hook() being called several thousand times
+// per request.
+if ($reset) {
+$implementations = array();
+$verified = array();
+cache_set('module_implements', array(), 'cache_bootstrap');
+drupal_static_reset('module_hook_info');
+drupal_static_reset('drupal_alter');
+cache_clear_all('hook_info', 'cache_bootstrap');
+cache_clear_all('system_cache_tables', 'cache');
+return;
+}
+// Fetch implementations from cache.
+// This happens on the first call to module_implements(*, *, FALSE) during a
+// request, but also when $implementations have been reset, e.g. after
+// module_enable().
+if (empty($implementations)) {
+$implementations = cache_get('module_implements', 'cache_bootstrap');
+if ($implementations === FALSE) {
+$implementations = array();
+}
+else {
+$implementations = $implementations->data;
+}
+// Forget all previously "verified" hooks, in case that $implementations
+// were cleared via drupal_static_reset('module_implements') instead of
+// module_implements(*, *, TRUE).
+$verified = array();
+}
+if (!isset($implementations[$hook])) {
+// The hook is not cached, so ensure that whether or not it has
+// implementations, that the cache is updated at the end of the request.
+$implementations['#write_cache'] = TRUE;
+// Discover implementations for this hook.
+$hook_info = module_hook_info();
+$implementations[$hook] = array();
+$list = module_list(FALSE, FALSE, $sort);
+foreach ($list as $module) {
+$include_file = isset($hook_info[$hook]['group']) && module_load_include('inc', $module, $module . '.' . $hook_info[$hook]['group']);
+// Since module_hook() may needlessly try to load the include file again,
+// function_exists() is used directly here.
+if (function_exists($module . '_' . $hook)) {
+$implementations[$hook][$module] = $include_file ? $hook_info[$hook]['group'] : FALSE;
+}
+}
+// Allow modules to change the weight of specific implementations, but avoid
+// an infinite loop.
+if ($hook != 'module_implements_alter') {
+// Remember the implementations before hook_module_implements_alter().
+$implementations_before = $implementations[$hook];
+drupal_alter('module_implements', $implementations[$hook], $hook);
+// Verify implementations that were added or modified.
+foreach (array_diff_assoc($implementations[$hook], $implementations_before) as $module => $group) {
+// If drupal_alter('module_implements') changed or added a $group, the
+// respective file needs to be included.
+if ($group) {
+module_load_include('inc', $module, "$module.$group");
+}
+// If a new implementation was added, verify that the function exists.
+if (!function_exists($module . '_' . $hook)) {
+unset($implementations[$hook][$module]);
+}
+}
+}
+// Implementations for this hook are now "verified".
+$verified[$hook] = TRUE;
+}
+elseif (!isset($verified[$hook])) {
+// Implementations for this hook were in the cache, but they are not
+// "verified" yet.
+foreach ($implementations[$hook] as $module => $group) {
+// If this hook implementation is stored in a lazy-loaded file, so include
+// that file first.
+if ($group) {
+module_load_include('inc', $module, "$module.$group");
+}
+// It is possible that a module removed a hook implementation without the
+// implementations cache being rebuilt yet, so we check whether the
+// function exists on each request to avoid undefined function errors.
+// Since module_hook() may needlessly try to load the include file again,
+// function_exists() is used directly here.
+if (!function_exists($module . '_' . $hook)) {
+// Clear out the stale implementation from the cache and force a cache
+// refresh to forget about no longer existing hook implementations.
+unset($implementations[$hook][$module]);
+$implementations['#write_cache'] = TRUE;
+}
+}
+$verified[$hook] = TRUE;
+}
+return array_keys($implementations[$hook]);
+}
+/**
+* Retrieves a list of hooks that are declared through hook_hook_info().
+*
+* @return
+*   An associative array whose keys are hook names and whose values are an
+*   associative array containing a group name. The structure of the array
+*   is the same as the return value of hook_hook_info().
+*
+* @see hook_hook_info()
+*/
+function module_hook_info() {
+// This function is indirectly invoked from bootstrap_invoke_all(), in which
+// case common.inc, subsystems, and modules are not loaded yet, so it does not
+// make sense to support hook groups resp. lazy-loaded include files prior to
+// full bootstrap.
+if (drupal_bootstrap(NULL, FALSE) != DRUPAL_BOOTSTRAP_FULL) {
+return array();
+}
+$hook_info = &drupal_static(__FUNCTION__);
+if (!isset($hook_info)) {
+$hook_info = array();
+$cache = cache_get('hook_info', 'cache_bootstrap');
+if ($cache === FALSE) {
+// Rebuild the cache and save it.
+// We can't use module_invoke_all() here or it would cause an infinite
+// loop.
+foreach (module_list() as $module) {
+$function = $module . '_hook_info';
+if (function_exists($function)) {
+$result = $function();
+if (isset($result) && is_array($result)) {
+$hook_info = array_merge_recursive($hook_info, $result);
+}
+}
+}
+// We can't use drupal_alter() for the same reason as above.
+foreach (module_list() as $module) {
+$function = $module . '_hook_info_alter';
+if (function_exists($function)) {
+$function($hook_info);
+}
+}
+cache_set('hook_info', $hook_info, 'cache_bootstrap');
+}
+else {
+$hook_info = $cache->data;
+}
+}
+return $hook_info;
+}
+/**
+* Writes the hook implementation cache.
+*
+* @see module_implements()
+*/
+function module_implements_write_cache() {
+// The list of implementations includes vital modules only before full
+// bootstrap, so do not write cache if we are not fully bootstrapped yet.
+if (drupal_get_bootstrap_phase() != DRUPAL_BOOTSTRAP_FULL) {
+return;
+}
+$implementations = &drupal_static('module_implements');
+if (isset($implementations['#write_cache'])) {
+unset($implementations['#write_cache']);
+cache_set('module_implements', $implementations, 'cache_bootstrap');
+}
+}
+/**
+* Invokes a hook in a particular module.
+*
+* All arguments are passed by value. Use drupal_alter() if you need to pass
+* arguments by reference.
+*
+* @param $module
+*   The name of the module (without the .module extension).
+* @param $hook
+*   The name of the hook to invoke.
+* @param ...
+*   Arguments to pass to the hook implementation.
+*
+* @return
+*   The return value of the hook implementation.
+*
+* @see drupal_alter()
+*/
+function module_invoke($module, $hook) {
+$args = func_get_args();
+// Remove $module and $hook from the arguments.
+unset($args[0], $args[1]);
+if (module_hook($module, $hook)) {
+return call_user_func_array($module . '_' . $hook, $args);
+}
+}
+/**
+* Invokes a hook in all enabled modules that implement it.
+*
+* All arguments are passed by value. Use drupal_alter() if you need to pass
+* arguments by reference.
+*
+* @param $hook
+*   The name of the hook to invoke.
+* @param ...
+*   Arguments to pass to the hook.
+*
+* @return
+*   An array of return values of the hook implementations. If modules return
+*   arrays from their implementations, those are merged into one array
+*   recursively. Note: integer keys in arrays will be lost, as the merge is
+*   done using array_merge_recursive().
+*
+* @see drupal_alter()
+*/
+function module_invoke_all($hook) {
+$args = func_get_args();
+// Remove $hook from the arguments.
+unset($args[0]);
+$return = array();
+foreach (module_implements($hook) as $module) {
+$function = $module . '_' . $hook;
+if (function_exists($function)) {
+$result = call_user_func_array($function, $args);
+if (isset($result) && is_array($result)) {
+$return = array_merge_recursive($return, $result);
+}
+elseif (isset($result)) {
+$return[] = $result;
+}
+}
+}
+return $return;
+}
+/**
+* @} End of "defgroup hooks".
+*/
+/**
+* Returns an array of modules required by core.
+*/
+function drupal_required_modules() {
+$files = drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info$/', 'modules', 'name', 0);
+$required = array();
+// An installation profile is required and one must always be loaded.
+$required[] = drupal_get_profile();
+foreach ($files as $name => $file) {
+$info = drupal_parse_info_file($file->uri);
+if (!empty($info) && !empty($info['required']) && $info['required']) {
+$required[] = $name;
+}
+}
+return $required;
+}
+/**
+* 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 (a third is supported for
+* legacy reasons, but should not be used in new code). 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',
+*   );
+*   drupal_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,
+*   );
+*   drupal_alter('mymodule_data', $data, $context);
+* @endcode
+*
+* @param $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 drupal_alter() to
+*   execute both hook_form_alter() and hook_form_FORM_ID_alter()
+*   implementations, it passes array('form', 'form_' . $form_id) for $type.
+* @param $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 $context1
+*   (optional) An additional variable that is passed by reference.
+* @param $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.
+* @param $context3
+*   (optional) An additional variable that is passed by reference. This
+*   parameter is deprecated and will not exist in Drupal 8; consequently, it
+*   should not be used for new Drupal 7 code either. It is here only for
+*   backwards compatibility with older code that passed additional arguments
+*   to drupal_alter().
+*/
+function drupal_alter($type, &$data, &$context1 = NULL, &$context2 = NULL, &$context3 = NULL) {
+// Use the advanced drupal_static() pattern, since this is called very often.
+static $drupal_static_fast;
+if (!isset($drupal_static_fast)) {
+$drupal_static_fast['functions'] = &drupal_static(__FUNCTION__);
+}
+$functions = &$drupal_static_fast['functions'];
+// Most of the time, $type is passed as a string, so for performance,
+// normalize it to that. When passed as an array, usually the first item in
+// the array is a generic type, and additional items in the array are more
+// specific variants of it, as in the case of array('form', 'form_FORM_ID').
+if (is_array($type)) {
+$cid = implode(',', $type);
+$extra_types = $type;
+$type = array_shift($extra_types);
+// Allow if statements in this function to use the faster isset() rather
+// than !empty() both when $type is passed as a string, or as an array with
+// one item.
+if (empty($extra_types)) {
+unset($extra_types);
+}
+}
+else {
+$cid = $type;
+}
+// Some alter hooks are invoked many times per page request, so statically
+// cache the list of functions to call, and on subsequent calls, iterate
+// through them quickly.
+if (!isset($functions[$cid])) {
+$functions[$cid] = array();
+$hook = $type . '_alter';
+$modules = module_implements($hook);
+if (!isset($extra_types)) {
+// For the more common case of a single hook, we do not need to call
+// function_exists(), since module_implements() returns only modules with
+// implementations.
+foreach ($modules as $module) {
+$functions[$cid][] = $module . '_' . $hook;
+}
+}
+else {
+// For multiple hooks, we need $modules to contain every module that
+// implements at least one of them.
+$extra_modules = array();
+foreach ($extra_types as $extra_type) {
+$extra_modules = array_merge($extra_modules, module_implements($extra_type . '_alter'));
+}
+// If any modules implement one of the extra hooks that do not implement
+// the primary hook, we need to add them to the $modules array in their
+// appropriate order. module_implements() can only return ordered
+// implementations of a single hook. To get the ordered implementations
+// of multiple hooks, we mimic the module_implements() logic of first
+// ordering by module_list(), and then calling
+// drupal_alter('module_implements').
+if (array_diff($extra_modules, $modules)) {
+// Merge the arrays and order by module_list().
+$modules = array_intersect(module_list(), array_merge($modules, $extra_modules));
+// Since module_implements() already took care of loading the necessary
+// include files, we can safely pass FALSE for the array values.
+$implementations = array_fill_keys($modules, FALSE);
+// Let modules adjust the order solely based on the primary hook. This
+// ensures the same module order regardless of whether this if block
+// runs. Calling drupal_alter() recursively in this way does not result
+// in an infinite loop, because this call is for a single $type, so we
+// won't end up in this code block again.
+drupal_alter('module_implements', $implementations, $hook);
+$modules = array_keys($implementations);
+}
+foreach ($modules as $module) {
+// Since $modules is a merged array, for any given module, we do not
+// know whether it has any particular implementation, so we need a
+// function_exists().
+$function = $module . '_' . $hook;
+if (function_exists($function)) {
+$functions[$cid][] = $function;
+}
+foreach ($extra_types as $extra_type) {
+$function = $module . '_' . $extra_type . '_alter';
+if (function_exists($function)) {
+$functions[$cid][] = $function;
+}
+}
+}
+}
+// Allow the theme to alter variables after the theme system has been
+// initialized.
+global $theme, $base_theme_info;
+if (isset($theme)) {
+$theme_keys = array();
+foreach ($base_theme_info as $base) {
+$theme_keys[] = $base->name;
+}
+$theme_keys[] = $theme;
+foreach ($theme_keys as $theme_key) {
+$function = $theme_key . '_' . $hook;
+if (function_exists($function)) {
+$functions[$cid][] = $function;
+}
+if (isset($extra_types)) {
+foreach ($extra_types as $extra_type) {
+$function = $theme_key . '_' . $extra_type . '_alter';
+if (function_exists($function)) {
+$functions[$cid][] = $function;
+}
+}
+}
+}
+}
+}
+foreach ($functions[$cid] as $function) {
+$function($data, $context1, $context2, $context3);
+}
+}