diff -r 07239de796bb -r e756a8c72c3d cms/drupal/includes/menu.inc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cms/drupal/includes/menu.inc	Fri Sep 08 12:04:06 2017 +0200
@@ -0,0 +1,3952 @@
+<?php
+
+/**
+ * @file
+ * API for the Drupal menu system.
+ */
+
+/**
+ * @defgroup menu Menu system
+ * @{
+ * Define the navigation menus, and route page requests to code based on URLs.
+ *
+ * The Drupal menu system drives both the navigation system from a user
+ * perspective and the callback system that Drupal uses to respond to URLs
+ * passed from the browser. For this reason, a good understanding of the
+ * menu system is fundamental to the creation of complex modules. As a note,
+ * this is related to, but separate from menu.module, which allows menus
+ * (which in this context are hierarchical lists of links) to be customized from
+ * the Drupal administrative interface.
+ *
+ * Drupal's menu system follows a simple hierarchy defined by paths.
+ * Implementations of hook_menu() define menu items and assign them to
+ * paths (which should be unique). The menu system aggregates these items
+ * and determines the menu hierarchy from the paths. For example, if the
+ * paths defined were a, a/b, e, a/b/c/d, f/g, and a/b/h, the menu system
+ * would form the structure:
+ * - a
+ *   - a/b
+ *     - a/b/c/d
+ *     - a/b/h
+ * - e
+ * - f/g
+ * Note that the number of elements in the path does not necessarily
+ * determine the depth of the menu item in the tree.
+ *
+ * When responding to a page request, the menu system looks to see if the
+ * path requested by the browser is registered as a menu item with a
+ * callback. If not, the system searches up the menu tree for the most
+ * complete match with a callback it can find. If the path a/b/i is
+ * requested in the tree above, the callback for a/b would be used.
+ *
+ * The found callback function is called with any arguments specified
+ * in the "page arguments" attribute of its menu item. The
+ * attribute must be an array. After these arguments, any remaining
+ * components of the path are appended as further arguments. In this
+ * way, the callback for a/b above could respond to a request for
+ * a/b/i differently than a request for a/b/j.
+ *
+ * For an illustration of this process, see page_example.module.
+ *
+ * Access to the callback functions is also protected by the menu system.
+ * The "access callback" with an optional "access arguments" of each menu
+ * item is called before the page callback proceeds. If this returns TRUE,
+ * then access is granted; if FALSE, then access is denied. Default local task
+ * menu items (see next paragraph) may omit this attribute to use the value
+ * provided by the parent item.
+ *
+ * In the default Drupal interface, you will notice many links rendered as
+ * tabs. These are known in the menu system as "local tasks", and they are
+ * rendered as tabs by default, though other presentations are possible.
+ * Local tasks function just as other menu items in most respects. It is
+ * convention that the names of these tasks should be short verbs if
+ * possible. In addition, a "default" local task should be provided for
+ * each set. When visiting a local task's parent menu item, the default
+ * local task will be rendered as if it is selected; this provides for a
+ * normal tab user experience. This default task is special in that it
+ * links not to its provided path, but to its parent item's path instead.
+ * The default task's path is only used to place it appropriately in the
+ * menu hierarchy.
+ *
+ * Everything described so far is stored in the menu_router table. The
+ * menu_links table holds the visible menu links. By default these are
+ * derived from the same hook_menu definitions, however you are free to
+ * add more with menu_link_save().
+ */
+
+/**
+ * @defgroup menu_flags Menu flags
+ * @{
+ * Flags for use in the "type" attribute of menu items.
+ */
+
+/**
+ * Internal menu flag -- menu item is the root of the menu tree.
+ */
+define('MENU_IS_ROOT', 0x0001);
+
+/**
+ * Internal menu flag -- menu item is visible in the menu tree.
+ */
+define('MENU_VISIBLE_IN_TREE', 0x0002);
+
+/**
+ * Internal menu flag -- menu item is visible in the breadcrumb.
+ */
+define('MENU_VISIBLE_IN_BREADCRUMB', 0x0004);
+
+/**
+ * Internal menu flag -- menu item links back to its parent.
+ */
+define('MENU_LINKS_TO_PARENT', 0x0008);
+
+/**
+ * Internal menu flag -- menu item can be modified by administrator.
+ */
+define('MENU_MODIFIED_BY_ADMIN', 0x0020);
+
+/**
+ * Internal menu flag -- menu item was created by administrator.
+ */
+define('MENU_CREATED_BY_ADMIN', 0x0040);
+
+/**
+ * Internal menu flag -- menu item is a local task.
+ */
+define('MENU_IS_LOCAL_TASK', 0x0080);
+
+/**
+ * Internal menu flag -- menu item is a local action.
+ */
+define('MENU_IS_LOCAL_ACTION', 0x0100);
+
+/**
+ * @} End of "Menu flags".
+ */
+
+/**
+ * @defgroup menu_item_types Menu item types
+ * @{
+ * Definitions for various menu item types.
+ *
+ * Menu item definitions provide one of these constants, which are shortcuts for
+ * combinations of @link menu_flags Menu flags @endlink.
+ */
+
+/**
+ * Menu type -- A "normal" menu item that's shown in menu and breadcrumbs.
+ *
+ * Normal menu items show up in the menu tree and can be moved/hidden by
+ * the administrator. Use this for most menu items. It is the default value if
+ * no menu item type is specified.
+ */
+define('MENU_NORMAL_ITEM', MENU_VISIBLE_IN_TREE | MENU_VISIBLE_IN_BREADCRUMB);
+
+/**
+ * Menu type -- A hidden, internal callback, typically used for API calls.
+ *
+ * Callbacks simply register a path so that the correct function is fired
+ * when the URL is accessed. They do not appear in menus or breadcrumbs.
+ */
+define('MENU_CALLBACK', 0x0000);
+
+/**
+ * Menu type -- A normal menu item, hidden until enabled by an administrator.
+ *
+ * Modules may "suggest" menu items that the administrator may enable. They act
+ * just as callbacks do until enabled, at which time they act like normal items.
+ * Note for the value: 0x0010 was a flag which is no longer used, but this way
+ * the values of MENU_CALLBACK and MENU_SUGGESTED_ITEM are separate.
+ */
+define('MENU_SUGGESTED_ITEM', MENU_VISIBLE_IN_BREADCRUMB | 0x0010);
+
+/**
+ * Menu type -- A task specific to the parent item, usually rendered as a tab.
+ *
+ * Local tasks are menu items that describe actions to be performed on their
+ * parent item. An example is the path "node/52/edit", which performs the
+ * "edit" task on "node/52".
+ */
+define('MENU_LOCAL_TASK', MENU_IS_LOCAL_TASK | MENU_VISIBLE_IN_BREADCRUMB);
+
+/**
+ * Menu type -- The "default" local task, which is initially active.
+ *
+ * Every set of local tasks should provide one "default" task, that links to the
+ * same path as its parent when clicked.
+ */
+define('MENU_DEFAULT_LOCAL_TASK', MENU_IS_LOCAL_TASK | MENU_LINKS_TO_PARENT | MENU_VISIBLE_IN_BREADCRUMB);
+
+/**
+ * Menu type -- An action specific to the parent, usually rendered as a link.
+ *
+ * Local actions are menu items that describe actions on the parent item such
+ * as adding a new user, taxonomy term, etc.
+ */
+define('MENU_LOCAL_ACTION', MENU_IS_LOCAL_TASK | MENU_IS_LOCAL_ACTION | MENU_VISIBLE_IN_BREADCRUMB);
+
+/**
+ * @} End of "Menu item types".
+ */
+
+/**
+ * @defgroup menu_context_types Menu context types
+ * @{
+ * Flags for use in the "context" attribute of menu router items.
+ */
+
+/**
+ * Internal menu flag: Invisible local task.
+ *
+ * This flag may be used for local tasks like "Delete", so custom modules and
+ * themes can alter the default context and expose the task by altering menu.
+ */
+define('MENU_CONTEXT_NONE', 0x0000);
+
+/**
+ * Internal menu flag: Local task should be displayed in page context.
+ */
+define('MENU_CONTEXT_PAGE', 0x0001);
+
+/**
+ * Internal menu flag: Local task should be displayed inline.
+ */
+define('MENU_CONTEXT_INLINE', 0x0002);
+
+/**
+ * @} End of "Menu context types".
+ */
+
+/**
+ * @defgroup menu_status_codes Menu status codes
+ * @{
+ * Status codes for menu callbacks.
+ */
+
+/**
+ * Internal menu status code -- Menu item was found.
+ */
+define('MENU_FOUND', 1);
+
+/**
+ * Menu status code -- Not found.
+ *
+ * This can be used as the return value from a page callback, although it is
+ * preferable to use a load function to accomplish this; see the hook_menu()
+ * documentation for details.
+ */
+define('MENU_NOT_FOUND', 2);
+
+/**
+ * Menu status code -- Access denied.
+ *
+ * This can be used as the return value from a page callback, although it is
+ * preferable to use an access callback to accomplish this; see the hook_menu()
+ * documentation for details.
+ */
+define('MENU_ACCESS_DENIED', 3);
+
+/**
+ * Internal menu status code -- Menu item inaccessible because site is offline.
+ */
+define('MENU_SITE_OFFLINE', 4);
+
+/**
+ * Internal menu status code -- Everything is working fine.
+ */
+define('MENU_SITE_ONLINE', 5);
+
+/**
+ * @} End of "Menu status codes".
+ */
+
+/**
+ * @defgroup menu_tree_parameters Menu tree parameters
+ * @{
+ * Parameters for a menu tree.
+ */
+
+ /**
+ * The maximum number of path elements for a menu callback
+ */
+define('MENU_MAX_PARTS', 9);
+
+
+/**
+ * The maximum depth of a menu links tree - matches the number of p columns.
+ */
+define('MENU_MAX_DEPTH', 9);
+
+
+/**
+ * @} End of "Menu tree parameters".
+ */
+
+/**
+ * Reserved key to identify the most specific menu link for a given path.
+ *
+ * The value of this constant is a hash of the constant name. We use the hash
+ * so that the reserved key is over 32 characters in length and will not
+ * collide with allowed menu names:
+ * @code
+ * sha1('MENU_PREFERRED_LINK') = 1cf698d64d1aa4b83907cf6ed55db3a7f8e92c91
+ * @endcode
+ *
+ * @see menu_link_get_preferred()
+ */
+define('MENU_PREFERRED_LINK', '1cf698d64d1aa4b83907cf6ed55db3a7f8e92c91');
+
+/**
+ * Returns the ancestors (and relevant placeholders) for any given path.
+ *
+ * For example, the ancestors of node/12345/edit are:
+ * - node/12345/edit
+ * - node/12345/%
+ * - node/%/edit
+ * - node/%/%
+ * - node/12345
+ * - node/%
+ * - node
+ *
+ * To generate these, we will use binary numbers. Each bit represents a
+ * part of the path. If the bit is 1, then it represents the original
+ * value while 0 means wildcard. If the path is node/12/edit/foo
+ * then the 1011 bitstring represents node/%/edit/foo where % means that
+ * any argument matches that part. We limit ourselves to using binary
+ * numbers that correspond the patterns of wildcards of router items that
+ * actually exists. This list of 'masks' is built in menu_rebuild().
+ *
+ * @param $parts
+ *   An array of path parts; for the above example, 
+ *   array('node', '12345', 'edit').
+ *
+ * @return
+ *   An array which contains the ancestors and placeholders. Placeholders
+ *   simply contain as many '%s' as the ancestors.
+ */
+function menu_get_ancestors($parts) {
+  $number_parts = count($parts);
+  $ancestors = array();
+  $length =  $number_parts - 1;
+  $end = (1 << $number_parts) - 1;
+  $masks = variable_get('menu_masks');
+  // If the optimized menu_masks array is not available use brute force to get
+  // the correct $ancestors and $placeholders returned. Do not use this as the
+  // default value of the menu_masks variable to avoid building such a big
+  // array.
+  if (!$masks) {
+    $masks = range(511, 1);
+  }
+  // Only examine patterns that actually exist as router items (the masks).
+  foreach ($masks as $i) {
+    if ($i > $end) {
+      // Only look at masks that are not longer than the path of interest.
+      continue;
+    }
+    elseif ($i < (1 << $length)) {
+      // We have exhausted the masks of a given length, so decrease the length.
+      --$length;
+    }
+    $current = '';
+    for ($j = $length; $j >= 0; $j--) {
+      // Check the bit on the $j offset.
+      if ($i & (1 << $j)) {
+        // Bit one means the original value.
+        $current .= $parts[$length - $j];
+      }
+      else {
+        // Bit zero means means wildcard.
+        $current .= '%';
+      }
+      // Unless we are at offset 0, add a slash.
+      if ($j) {
+        $current .= '/';
+      }
+    }
+    $ancestors[] = $current;
+  }
+  return $ancestors;
+}
+
+/**
+ * Unserializes menu data, using a map to replace path elements.
+ *
+ * The menu system stores various path-related information (such as the 'page
+ * arguments' and 'access arguments' components of a menu item) in the database
+ * using serialized arrays, where integer values in the arrays represent
+ * arguments to be replaced by values from the path. This function first
+ * unserializes such menu information arrays, and then does the path
+ * replacement.
+ *
+ * The path replacement acts on each integer-valued element of the unserialized
+ * menu data array ($data) using a map array ($map, which is typically an array
+ * of path arguments) as a list of replacements. For instance, if there is an
+ * element of $data whose value is the number 2, then it is replaced in $data
+ * with $map[2]; non-integer values in $data are left alone.
+ *
+ * As an example, an unserialized $data array with elements ('node_load', 1)
+ * represents instructions for calling the node_load() function. Specifically,
+ * this instruction says to use the path component at index 1 as the input
+ * parameter to node_load(). If the path is 'node/123', then $map will be the
+ * array ('node', 123), and the returned array from this function will have
+ * elements ('node_load', 123), since $map[1] is 123. This return value will
+ * indicate specifically that node_load(123) is to be called to load the node
+ * whose ID is 123 for this menu item.
+ *
+ * @param $data
+ *   A serialized array of menu data, as read from the database.
+ * @param $map
+ *   A path argument array, used to replace integer values in $data; an integer
+ *   value N in $data will be replaced by value $map[N]. Typically, the $map
+ *   array is generated from a call to the arg() function.
+ *
+ * @return
+ *   The unserialized $data array, with path arguments replaced.
+ */
+function menu_unserialize($data, $map) {
+  if ($data = unserialize($data)) {
+    foreach ($data as $k => $v) {
+      if (is_int($v)) {
+        $data[$k] = isset($map[$v]) ? $map[$v] : '';
+      }
+    }
+    return $data;
+  }
+  else {
+    return array();
+  }
+}
+
+
+
+/**
+ * Replaces the statically cached item for a given path.
+ *
+ * @param $path
+ *   The path.
+ * @param $router_item
+ *   The router item. Usually a router entry from menu_get_item() is either
+ *   modified or set to a different path. This allows the navigation block,
+ *   the page title, the breadcrumb, and the page help to be modified in one
+ *   call.
+ */
+function menu_set_item($path, $router_item) {
+  menu_get_item($path, $router_item);
+}
+
+/**
+ * Gets a router item.
+ *
+ * @param $path
+ *   The path; for example, 'node/5'. The function will find the corresponding
+ *   node/% item and return that. Defaults to the current path.
+ * @param $router_item
+ *   Internal use only.
+ *
+ * @return
+ *   The router item or, if an error occurs in _menu_translate(), FALSE. A
+ *   router item is an associative array corresponding to one row in the
+ *   menu_router table. The value corresponding to the key 'map' holds the
+ *   loaded objects. The value corresponding to the key 'access' is TRUE if the
+ *   current user can access this page. The values corresponding to the keys
+ *   'title', 'page_arguments', 'access_arguments', and 'theme_arguments' will
+ *   be filled in based on the database values and the objects loaded.
+ */
+function menu_get_item($path = NULL, $router_item = NULL) {
+  $router_items = &drupal_static(__FUNCTION__);
+  if (!isset($path)) {
+    $path = $_GET['q'];
+  }
+  if (isset($router_item)) {
+    $router_items[$path] = $router_item;
+  }
+  if (!isset($router_items[$path])) {
+    // Rebuild if we know it's needed, or if the menu masks are missing which
+    // occurs rarely, likely due to a race condition of multiple rebuilds.
+    if (variable_get('menu_rebuild_needed', FALSE) || !variable_get('menu_masks', array())) {
+      if (_menu_check_rebuild()) {
+        menu_rebuild();
+      }
+    }
+    $original_map = arg(NULL, $path);
+
+    $parts = array_slice($original_map, 0, MENU_MAX_PARTS);
+    $ancestors = menu_get_ancestors($parts);
+    $router_item = db_query_range('SELECT * FROM {menu_router} WHERE path IN (:ancestors) ORDER BY fit DESC', 0, 1, array(':ancestors' => $ancestors))->fetchAssoc();
+
+    if ($router_item) {
+      // Allow modules to alter the router item before it is translated and
+      // checked for access.
+      drupal_alter('menu_get_item', $router_item, $path, $original_map);
+
+      $map = _menu_translate($router_item, $original_map);
+      $router_item['original_map'] = $original_map;
+      if ($map === FALSE) {
+        $router_items[$path] = FALSE;
+        return FALSE;
+      }
+      if ($router_item['access']) {
+        $router_item['map'] = $map;
+        $router_item['page_arguments'] = array_merge(menu_unserialize($router_item['page_arguments'], $map), array_slice($map, $router_item['number_parts']));
+        $router_item['theme_arguments'] = array_merge(menu_unserialize($router_item['theme_arguments'], $map), array_slice($map, $router_item['number_parts']));
+      }
+    }
+    $router_items[$path] = $router_item;
+  }
+  return $router_items[$path];
+}
+
+/**
+ * Execute the page callback associated with the current path.
+ *
+ * @param $path
+ *   The drupal path whose handler is to be be executed. If set to NULL, then
+ *   the current path is used.
+ * @param $deliver
+ *   (optional) A boolean to indicate whether the content should be sent to the
+ *   browser using the appropriate delivery callback (TRUE) or whether to return
+ *   the result to the caller (FALSE).
+ */
+function menu_execute_active_handler($path = NULL, $deliver = TRUE) {
+  // Check if site is offline.
+  $page_callback_result = _menu_site_is_offline() ? MENU_SITE_OFFLINE : MENU_SITE_ONLINE;
+
+  // Allow other modules to change the site status but not the path because that
+  // would not change the global variable. hook_url_inbound_alter() can be used
+  // to change the path. Code later will not use the $read_only_path variable.
+  $read_only_path = !empty($path) ? $path : $_GET['q'];
+  drupal_alter('menu_site_status', $page_callback_result, $read_only_path);
+
+  // Only continue if the site status is not set.
+  if ($page_callback_result == MENU_SITE_ONLINE) {
+    if ($router_item = menu_get_item($path)) {
+      if ($router_item['access']) {
+        if ($router_item['include_file']) {
+          require_once DRUPAL_ROOT . '/' . $router_item['include_file'];
+        }
+        $page_callback_result = call_user_func_array($router_item['page_callback'], $router_item['page_arguments']);
+      }
+      else {
+        $page_callback_result = MENU_ACCESS_DENIED;
+      }
+    }
+    else {
+      $page_callback_result = MENU_NOT_FOUND;
+    }
+  }
+
+  // Deliver the result of the page callback to the browser, or if requested,
+  // return it raw, so calling code can do more processing.
+  if ($deliver) {
+    $default_delivery_callback = (isset($router_item) && $router_item) ? $router_item['delivery_callback'] : NULL;
+    drupal_deliver_page($page_callback_result, $default_delivery_callback);
+  }
+  else {
+    return $page_callback_result;
+  }
+}
+
+/**
+ * Loads objects into the map as defined in the $item['load_functions'].
+ *
+ * @param $item
+ *   A menu router or menu link item
+ * @param $map
+ *   An array of path arguments; for example, array('node', '5').
+ *
+ * @return
+ *   Returns TRUE for success, FALSE if an object cannot be loaded.
+ *   Names of object loading functions are placed in $item['load_functions'].
+ *   Loaded objects are placed in $map[]; keys are the same as keys in the
+ *   $item['load_functions'] array.
+ *   $item['access'] is set to FALSE if an object cannot be loaded.
+ */
+function _menu_load_objects(&$item, &$map) {
+  if ($load_functions = $item['load_functions']) {
+    // If someone calls this function twice, then unserialize will fail.
+    if (!is_array($load_functions)) {
+      $load_functions = unserialize($load_functions);
+    }
+    $path_map = $map;
+    foreach ($load_functions as $index => $function) {
+      if ($function) {
+        $value = isset($path_map[$index]) ? $path_map[$index] : '';
+        if (is_array($function)) {
+          // Set up arguments for the load function. These were pulled from
+          // 'load arguments' in the hook_menu() entry, but they need
+          // some processing. In this case the $function is the key to the
+          // load_function array, and the value is the list of arguments.
+          list($function, $args) = each($function);
+          $load_functions[$index] = $function;
+
+          // Some arguments are placeholders for dynamic items to process.
+          foreach ($args as $i => $arg) {
+            if ($arg === '%index') {
+              // Pass on argument index to the load function, so multiple
+              // occurrences of the same placeholder can be identified.
+              $args[$i] = $index;
+            }
+            if ($arg === '%map') {
+              // Pass on menu map by reference. The accepting function must
+              // also declare this as a reference if it wants to modify
+              // the map.
+              $args[$i] = &$map;
+            }
+            if (is_int($arg)) {
+              $args[$i] = isset($path_map[$arg]) ? $path_map[$arg] : '';
+            }
+          }
+          array_unshift($args, $value);
+          $return = call_user_func_array($function, $args);
+        }
+        else {
+          $return = $function($value);
+        }
+        // If callback returned an error or there is no callback, trigger 404.
+        if ($return === FALSE) {
+          $item['access'] = FALSE;
+          $map = FALSE;
+          return FALSE;
+        }
+        $map[$index] = $return;
+      }
+    }
+    $item['load_functions'] = $load_functions;
+  }
+  return TRUE;
+}
+
+/**
+ * Checks access to a menu item using the access callback.
+ *
+ * @param $item
+ *   A menu router or menu link item
+ * @param $map
+ *   An array of path arguments; for example, array('node', '5').
+ *
+ * @return
+ *   $item['access'] becomes TRUE if the item is accessible, FALSE otherwise.
+ */
+function _menu_check_access(&$item, $map) {
+  $item['access'] = FALSE;
+  // Determine access callback, which will decide whether or not the current
+  // user has access to this path.
+  $callback = empty($item['access_callback']) ? 0 : trim($item['access_callback']);
+  // Check for a TRUE or FALSE value.
+  if (is_numeric($callback)) {
+    $item['access'] = (bool) $callback;
+  }
+  else {
+    $arguments = menu_unserialize($item['access_arguments'], $map);
+    // As call_user_func_array is quite slow and user_access is a very common
+    // callback, it is worth making a special case for it.
+    if ($callback == 'user_access') {
+      $item['access'] = (count($arguments) == 1) ? user_access($arguments[0]) : user_access($arguments[0], $arguments[1]);
+    }
+    elseif (function_exists($callback)) {
+      $item['access'] = call_user_func_array($callback, $arguments);
+    }
+  }
+}
+
+/**
+ * Localizes the router item title using t() or another callback.
+ *
+ * Translate the title and description to allow storage of English title
+ * strings in the database, yet display of them in the language required
+ * by the current user.
+ *
+ * @param $item
+ *   A menu router item or a menu link item.
+ * @param $map
+ *   The path as an array with objects already replaced. E.g., for path
+ *   node/123 $map would be array('node', $node) where $node is the node
+ *   object for node 123.
+ * @param $link_translate
+ *   TRUE if we are translating a menu link item; FALSE if we are
+ *   translating a menu router item.
+ *
+ * @return
+ *   No return value.
+ *   $item['title'] is localized according to $item['title_callback'].
+ *   If an item's callback is check_plain(), $item['options']['html'] becomes
+ *   TRUE.
+ *   $item['description'] is translated using t().
+ *   When doing link translation and the $item['options']['attributes']['title']
+ *   (link title attribute) matches the description, it is translated as well.
+ */
+function _menu_item_localize(&$item, $map, $link_translate = FALSE) {
+  $callback = $item['title_callback'];
+  $item['localized_options'] = $item['options'];
+  // All 'class' attributes are assumed to be an array during rendering, but
+  // links stored in the database may use an old string value.
+  // @todo In order to remove this code we need to implement a database update
+  //   including unserializing all existing link options and running this code
+  //   on them, as well as adding validation to menu_link_save().
+  if (isset($item['options']['attributes']['class']) && is_string($item['options']['attributes']['class'])) {
+    $item['localized_options']['attributes']['class'] = explode(' ', $item['options']['attributes']['class']);
+  }
+  // If we are translating the title of a menu link, and its title is the same
+  // as the corresponding router item, then we can use the title information
+  // from the router. If it's customized, then we need to use the link title
+  // itself; can't localize.
+  // If we are translating a router item (tabs, page, breadcrumb), then we
+  // can always use the information from the router item.
+  if (!$link_translate || ($item['title'] == $item['link_title'])) {
+    // t() is a special case. Since it is used very close to all the time,
+    // we handle it directly instead of using indirect, slower methods.
+    if ($callback == 't') {
+      if (empty($item['title_arguments'])) {
+        $item['title'] = t($item['title']);
+      }
+      else {
+        $item['title'] = t($item['title'], menu_unserialize($item['title_arguments'], $map));
+      }
+    }
+    elseif ($callback && function_exists($callback)) {
+      if (empty($item['title_arguments'])) {
+        $item['title'] = $callback($item['title']);
+      }
+      else {
+        $item['title'] = call_user_func_array($callback, menu_unserialize($item['title_arguments'], $map));
+      }
+      // Avoid calling check_plain again on l() function.
+      if ($callback == 'check_plain') {
+        $item['localized_options']['html'] = TRUE;
+      }
+    }
+  }
+  elseif ($link_translate) {
+    $item['title'] = $item['link_title'];
+  }
+
+  // Translate description, see the motivation above.
+  if (!empty($item['description'])) {
+    $original_description = $item['description'];
+    $item['description'] = t($item['description']);
+    if ($link_translate && isset($item['options']['attributes']['title']) && $item['options']['attributes']['title'] == $original_description) {
+      $item['localized_options']['attributes']['title'] = $item['description'];
+    }
+  }
+}
+
+/**
+ * Handles dynamic path translation and menu access control.
+ *
+ * When a user arrives on a page such as node/5, this function determines
+ * what "5" corresponds to, by inspecting the page's menu path definition,
+ * node/%node. This will call node_load(5) to load the corresponding node
+ * object.
+ *
+ * It also works in reverse, to allow the display of tabs and menu items which
+ * contain these dynamic arguments, translating node/%node to node/5.
+ *
+ * Translation of menu item titles and descriptions are done here to
+ * allow for storage of English strings in the database, and translation
+ * to the language required to generate the current page.
+ *
+ * @param $router_item
+ *   A menu router item
+ * @param $map
+ *   An array of path arguments; for example, array('node', '5').
+ * @param $to_arg
+ *   Execute $item['to_arg_functions'] or not. Use only if you want to render a
+ *   path from the menu table, for example tabs.
+ *
+ * @return
+ *   Returns the map with objects loaded as defined in the
+ *   $item['load_functions']. $item['access'] becomes TRUE if the item is
+ *   accessible, FALSE otherwise. $item['href'] is set according to the map.
+ *   If an error occurs during calling the load_functions (like trying to load
+ *   a non-existent node) then this function returns FALSE.
+ */
+function _menu_translate(&$router_item, $map, $to_arg = FALSE) {
+  if ($to_arg && !empty($router_item['to_arg_functions'])) {
+    // Fill in missing path elements, such as the current uid.
+    _menu_link_map_translate($map, $router_item['to_arg_functions']);
+  }
+  // The $path_map saves the pieces of the path as strings, while elements in
+  // $map may be replaced with loaded objects.
+  $path_map = $map;
+  if (!empty($router_item['load_functions']) && !_menu_load_objects($router_item, $map)) {
+    // An error occurred loading an object.
+    $router_item['access'] = FALSE;
+    return FALSE;
+  }
+
+  // Generate the link path for the page request or local tasks.
+  $link_map = explode('/', $router_item['path']);
+  if (isset($router_item['tab_root'])) {
+    $tab_root_map = explode('/', $router_item['tab_root']);
+  }
+  if (isset($router_item['tab_parent'])) {
+    $tab_parent_map = explode('/', $router_item['tab_parent']);
+  }
+  for ($i = 0; $i < $router_item['number_parts']; $i++) {
+    if ($link_map[$i] == '%') {
+      $link_map[$i] = $path_map[$i];
+    }
+    if (isset($tab_root_map[$i]) && $tab_root_map[$i] == '%') {
+      $tab_root_map[$i] = $path_map[$i];
+    }
+    if (isset($tab_parent_map[$i]) && $tab_parent_map[$i] == '%') {
+      $tab_parent_map[$i] = $path_map[$i];
+    }
+  }
+  $router_item['href'] = implode('/', $link_map);
+  $router_item['tab_root_href'] = implode('/', $tab_root_map);
+  $router_item['tab_parent_href'] = implode('/', $tab_parent_map);
+  $router_item['options'] = array();
+  _menu_check_access($router_item, $map);
+
+  // For performance, don't localize an item the user can't access.
+  if ($router_item['access']) {
+    _menu_item_localize($router_item, $map);
+  }
+
+  return $map;
+}
+
+/**
+ * Translates the path elements in the map using any to_arg helper function.
+ *
+ * @param $map
+ *   An array of path arguments; for example, array('node', '5').
+ * @param $to_arg_functions
+ *   An array of helper functions; for example, array(2 => 'menu_tail_to_arg').
+ *
+ * @see hook_menu()
+ */
+function _menu_link_map_translate(&$map, $to_arg_functions) {
+  $to_arg_functions = unserialize($to_arg_functions);
+  foreach ($to_arg_functions as $index => $function) {
+    // Translate place-holders into real values.
+    $arg = $function(!empty($map[$index]) ? $map[$index] : '', $map, $index);
+    if (!empty($map[$index]) || isset($arg)) {
+      $map[$index] = $arg;
+    }
+    else {
+      unset($map[$index]);
+    }
+  }
+}
+
+/**
+ * Returns a string containing the path relative to the current index.
+ */
+function menu_tail_to_arg($arg, $map, $index) {
+  return implode('/', array_slice($map, $index));
+}
+
+/**
+ * Loads the path as one string relative to the current index.
+ *
+ * To use this load function, you must specify the load arguments
+ * in the router item as:
+ * @code
+ * $item['load arguments'] = array('%map', '%index');
+ * @endcode
+ *
+ * @see search_menu().
+ */
+function menu_tail_load($arg, &$map, $index) {
+  $arg = implode('/', array_slice($map, $index));
+  $map = array_slice($map, 0, $index);
+  return $arg;
+}
+
+/**
+ * Provides menu link access control, translation, and argument handling.
+ *
+ * This function is similar to _menu_translate(), but it also does
+ * link-specific preparation (such as always calling to_arg() functions).
+ *
+ * @param $item
+ *   A menu link.
+ * @param $translate
+ *   (optional) Whether to try to translate a link containing dynamic path
+ *   argument placeholders (%) based on the menu router item of the current
+ *   path. Defaults to FALSE. Internally used for breadcrumbs.
+ *
+ * @return
+ *   Returns the map of path arguments with objects loaded as defined in the
+ *   $item['load_functions'].
+ *   $item['access'] becomes TRUE if the item is accessible, FALSE otherwise.
+ *   $item['href'] is generated from link_path, possibly by to_arg functions.
+ *   $item['title'] is generated from link_title, and may be localized.
+ *   $item['options'] is unserialized; it is also changed within the call here
+ *   to $item['localized_options'] by _menu_item_localize().
+ */
+function _menu_link_translate(&$item, $translate = FALSE) {
+  if (!is_array($item['options'])) {
+    $item['options'] = unserialize($item['options']);
+  }
+  if ($item['external']) {
+    $item['access'] = 1;
+    $map = array();
+    $item['href'] = $item['link_path'];
+    $item['title'] = $item['link_title'];
+    $item['localized_options'] = $item['options'];
+  }
+  else {
+    // Complete the path of the menu link with elements from the current path,
+    // if it contains dynamic placeholders (%).
+    $map = explode('/', $item['link_path']);
+    if (strpos($item['link_path'], '%') !== FALSE) {
+      // Invoke registered to_arg callbacks.
+      if (!empty($item['to_arg_functions'])) {
+        _menu_link_map_translate($map, $item['to_arg_functions']);
+      }
+      // Or try to derive the path argument map from the current router item,
+      // if this $item's path is within the router item's path. This means
+      // that if we are on the current path 'foo/%/bar/%/baz', then
+      // menu_get_item() will have translated the menu router item for the
+      // current path, and we can take over the argument map for a link like
+      // 'foo/%/bar'. This inheritance is only valid for breadcrumb links.
+      // @see _menu_tree_check_access()
+      // @see menu_get_active_breadcrumb()
+      elseif ($translate && ($current_router_item = menu_get_item())) {
+        // If $translate is TRUE, then this link is in the active trail.
+        // Only translate paths within the current path.
+        if (strpos($current_router_item['path'], $item['link_path']) === 0) {
+          $count = count($map);
+          $map = array_slice($current_router_item['original_map'], 0, $count);
+          $item['original_map'] = $map;
+          if (isset($current_router_item['map'])) {
+            $item['map'] = array_slice($current_router_item['map'], 0, $count);
+          }
+          // Reset access to check it (for the first time).
+          unset($item['access']);
+        }
+      }
+    }
+    $item['href'] = implode('/', $map);
+
+    // Skip links containing untranslated arguments.
+    if (strpos($item['href'], '%') !== FALSE) {
+      $item['access'] = FALSE;
+      return FALSE;
+    }
+    // menu_tree_check_access() may set this ahead of time for links to nodes.
+    if (!isset($item['access'])) {
+      if (!empty($item['load_functions']) && !_menu_load_objects($item, $map)) {
+        // An error occurred loading an object.
+        $item['access'] = FALSE;
+        return FALSE;
+      }
+      _menu_check_access($item, $map);
+    }
+    // For performance, don't localize a link the user can't access.
+    if ($item['access']) {
+      _menu_item_localize($item, $map, TRUE);
+    }
+  }
+
+  // Allow other customizations - e.g. adding a page-specific query string to the
+  // options array. For performance reasons we only invoke this hook if the link
+  // has the 'alter' flag set in the options array.
+  if (!empty($item['options']['alter'])) {
+    drupal_alter('translated_menu_link', $item, $map);
+  }
+
+  return $map;
+}
+
+/**
+ * Gets a loaded object from a router item.
+ *
+ * menu_get_object() provides access to objects loaded by the current router
+ * item. For example, on the page node/%node, the router loads the %node object,
+ * and calling menu_get_object() will return that. Normally, it is necessary to
+ * specify the type of object referenced, however node is the default.
+ * The following example tests to see whether the node being displayed is of the
+ * "story" content type:
+ * @code
+ * $node = menu_get_object();
+ * $story = $node->type == 'story';
+ * @endcode
+ *
+ * @param $type
+ *   Type of the object. These appear in hook_menu definitions as %type. Core
+ *   provides aggregator_feed, aggregator_category, contact, filter_format,
+ *   forum_term, menu, menu_link, node, taxonomy_vocabulary, user. See the
+ *   relevant {$type}_load function for more on each. Defaults to node.
+ * @param $position
+ *   The position of the object in the path, where the first path segment is 0.
+ *   For node/%node, the position of %node is 1, but for comment/reply/%node,
+ *   it's 2. Defaults to 1.
+ * @param $path
+ *   See menu_get_item() for more on this. Defaults to the current path.
+ */
+function menu_get_object($type = 'node', $position = 1, $path = NULL) {
+  $router_item = menu_get_item($path);
+  if (isset($router_item['load_functions'][$position]) && !empty($router_item['map'][$position]) && $router_item['load_functions'][$position] == $type . '_load') {
+    return $router_item['map'][$position];
+  }
+}
+
+/**
+ * Renders a menu tree based on the current path.
+ *
+ * The tree is expanded based on the current path and dynamic paths are also
+ * changed according to the defined to_arg functions (for example the 'My
+ * account' link is changed from user/% to a link with the current user's uid).
+ *
+ * @param $menu_name
+ *   The name of the menu.
+ *
+ * @return
+ *   A structured array representing the specified menu on the current page, to
+ *   be rendered by drupal_render().
+ */
+function menu_tree($menu_name) {
+  $menu_output = &drupal_static(__FUNCTION__, array());
+
+  if (!isset($menu_output[$menu_name])) {
+    $tree = menu_tree_page_data($menu_name);
+    $menu_output[$menu_name] = menu_tree_output($tree);
+  }
+  return $menu_output[$menu_name];
+}
+
+/**
+ * Returns an output structure for rendering a menu tree.
+ *
+ * The menu item's LI element is given one of the following classes:
+ * - expanded: The menu item is showing its submenu.
+ * - collapsed: The menu item has a submenu which is not shown.
+ * - leaf: The menu item has no submenu.
+ *
+ * @param $tree
+ *   A data structure representing the tree as returned from menu_tree_data.
+ *
+ * @return
+ *   A structured array to be rendered by drupal_render().
+ */
+function menu_tree_output($tree) {
+  $build = array();
+  $items = array();
+
+  // Pull out just the menu links we are going to render so that we
+  // get an accurate count for the first/last classes.
+  foreach ($tree as $data) {
+    if ($data['link']['access'] && !$data['link']['hidden']) {
+      $items[] = $data;
+    }
+  }
+
+  $router_item = menu_get_item();
+  $num_items = count($items);
+  foreach ($items as $i => $data) {
+    $class = array();
+    if ($i == 0) {
+      $class[] = 'first';
+    }
+    if ($i == $num_items - 1) {
+      $class[] = 'last';
+    }
+    // Set a class for the <li>-tag. Since $data['below'] may contain local
+    // tasks, only set 'expanded' class if the link also has children within
+    // the current menu.
+    if ($data['link']['has_children'] && $data['below']) {
+      $class[] = 'expanded';
+    }
+    elseif ($data['link']['has_children']) {
+      $class[] = 'collapsed';
+    }
+    else {
+      $class[] = 'leaf';
+    }
+    // Set a class if the link is in the active trail.
+    if ($data['link']['in_active_trail']) {
+      $class[] = 'active-trail';
+      $data['link']['localized_options']['attributes']['class'][] = 'active-trail';
+    }
+    // Normally, l() compares the href of every link with $_GET['q'] and sets
+    // the active class accordingly. But local tasks do not appear in menu
+    // trees, so if the current path is a local task, and this link is its
+    // tab root, then we have to set the class manually.
+    if ($data['link']['href'] == $router_item['tab_root_href'] && $data['link']['href'] != $_GET['q']) {
+      $data['link']['localized_options']['attributes']['class'][] = 'active';
+    }
+
+    // Allow menu-specific theme overrides.
+    $element['#theme'] = 'menu_link__' . strtr($data['link']['menu_name'], '-', '_');
+    $element['#attributes']['class'] = $class;
+    $element['#title'] = $data['link']['title'];
+    $element['#href'] = $data['link']['href'];
+    $element['#localized_options'] = !empty($data['link']['localized_options']) ? $data['link']['localized_options'] : array();
+    $element['#below'] = $data['below'] ? menu_tree_output($data['below']) : $data['below'];
+    $element['#original_link'] = $data['link'];
+    // Index using the link's unique mlid.
+    $build[$data['link']['mlid']] = $element;
+  }
+  if ($build) {
+    // Make sure drupal_render() does not re-order the links.
+    $build['#sorted'] = TRUE;
+    // Add the theme wrapper for outer markup.
+    // Allow menu-specific theme overrides.
+    $build['#theme_wrappers'][] = 'menu_tree__' . strtr($data['link']['menu_name'], '-', '_');
+  }
+
+  return $build;
+}
+
+/**
+ * Gets the data structure representing a named menu tree.
+ *
+ * Since this can be the full tree including hidden items, the data returned
+ * may be used for generating an an admin interface or a select.
+ *
+ * @param $menu_name
+ *   The named menu links to return
+ * @param $link
+ *   A fully loaded menu link, or NULL. If a link is supplied, only the
+ *   path to root will be included in the returned tree - as if this link
+ *   represented the current page in a visible menu.
+ * @param $max_depth
+ *   Optional maximum depth of links to retrieve. Typically useful if only one
+ *   or two levels of a sub tree are needed in conjunction with a non-NULL
+ *   $link, in which case $max_depth should be greater than $link['depth'].
+ *
+ * @return
+ *   An tree of menu links in an array, in the order they should be rendered.
+ */
+function menu_tree_all_data($menu_name, $link = NULL, $max_depth = NULL) {
+  $tree = &drupal_static(__FUNCTION__, array());
+
+  // Use $mlid as a flag for whether the data being loaded is for the whole tree.
+  $mlid = isset($link['mlid']) ? $link['mlid'] : 0;
+  // Generate a cache ID (cid) specific for this $menu_name, $link, $language, and depth.
+  $cid = 'links:' . $menu_name . ':all:' . $mlid . ':' . $GLOBALS['language']->language . ':' . (int) $max_depth;
+
+  if (!isset($tree[$cid])) {
+    // If the static variable doesn't have the data, check {cache_menu}.
+    $cache = cache_get($cid, 'cache_menu');
+    if ($cache && isset($cache->data)) {
+      // If the cache entry exists, it contains the parameters for
+      // menu_build_tree().
+      $tree_parameters = $cache->data;
+    }
+    // If the tree data was not in the cache, build $tree_parameters.
+    if (!isset($tree_parameters)) {
+      $tree_parameters = array(
+        'min_depth' => 1,
+        'max_depth' => $max_depth,
+      );
+      if ($mlid) {
+        // The tree is for a single item, so we need to match the values in its
+        // p columns and 0 (the top level) with the plid values of other links.
+        $parents = array(0);
+        for ($i = 1; $i < MENU_MAX_DEPTH; $i++) {
+          if (!empty($link["p$i"])) {
+            $parents[] = $link["p$i"];
+          }
+        }
+        $tree_parameters['expanded'] = $parents;
+        $tree_parameters['active_trail'] = $parents;
+        $tree_parameters['active_trail'][] = $mlid;
+      }
+
+      // Cache the tree building parameters using the page-specific cid.
+      cache_set($cid, $tree_parameters, 'cache_menu');
+    }
+
+    // Build the tree using the parameters; the resulting tree will be cached
+    // by _menu_build_tree()).
+    $tree[$cid] = menu_build_tree($menu_name, $tree_parameters);
+  }
+
+  return $tree[$cid];
+}
+
+/**
+ * Sets the path for determining the active trail of the specified menu tree.
+ *
+ * This path will also affect the breadcrumbs under some circumstances.
+ * Breadcrumbs are built using the preferred link returned by
+ * menu_link_get_preferred(). If the preferred link is inside one of the menus
+ * specified in calls to menu_tree_set_path(), the preferred link will be
+ * overridden by the corresponding path returned by menu_tree_get_path().
+ *
+ * Setting this path does not affect the main content; for that use
+ * menu_set_active_item() instead.
+ *
+ * @param $menu_name
+ *   The name of the affected menu tree.
+ * @param $path
+ *   The path to use when finding the active trail.
+ */
+function menu_tree_set_path($menu_name, $path = NULL) {
+  $paths = &drupal_static(__FUNCTION__);
+  if (isset($path)) {
+    $paths[$menu_name] = $path;
+  }
+  return isset($paths[$menu_name]) ? $paths[$menu_name] : NULL;
+}
+
+/**
+ * Gets the path for determining the active trail of the specified menu tree.
+ *
+ * @param $menu_name
+ *   The menu name of the requested tree.
+ *
+ * @return
+ *   A string containing the path. If no path has been specified with
+ *   menu_tree_set_path(), NULL is returned.
+ */
+function menu_tree_get_path($menu_name) {
+  return menu_tree_set_path($menu_name);
+}
+
+/**
+ * Gets the data structure for a named menu tree, based on the current page.
+ *
+ * The tree order is maintained by storing each parent in an individual
+ * field, see http://drupal.org/node/141866 for more.
+ *
+ * @param $menu_name
+ *   The named menu links to return.
+ * @param $max_depth
+ *   (optional) The maximum depth of links to retrieve.
+ * @param $only_active_trail
+ *   (optional) Whether to only return the links in the active trail (TRUE)
+ *   instead of all links on every level of the menu link tree (FALSE). Defaults
+ *   to FALSE. Internally used for breadcrumbs only.
+ *
+ * @return
+ *   An array of menu links, in the order they should be rendered. The array
+ *   is a list of associative arrays -- these have two keys, link and below.
+ *   link is a menu item, ready for theming as a link. Below represents the
+ *   submenu below the link if there is one, and it is a subtree that has the
+ *   same structure described for the top-level array.
+ */
+function menu_tree_page_data($menu_name, $max_depth = NULL, $only_active_trail = FALSE) {
+  $tree = &drupal_static(__FUNCTION__, array());
+
+  // Check if the active trail has been overridden for this menu tree.
+  $active_path = menu_tree_get_path($menu_name);
+  // Load the menu item corresponding to the current page.
+  if ($item = menu_get_item($active_path)) {
+    if (isset($max_depth)) {
+      $max_depth = min($max_depth, MENU_MAX_DEPTH);
+    }
+    // Generate a cache ID (cid) specific for this page.
+    $cid = 'links:' . $menu_name . ':page:' . $item['href'] . ':' . $GLOBALS['language']->language . ':' . (int) $item['access'] . ':' . (int) $max_depth;
+    // If we are asked for the active trail only, and $menu_name has not been
+    // built and cached for this page yet, then this likely means that it
+    // won't be built anymore, as this function is invoked from
+    // template_process_page(). So in order to not build a giant menu tree
+    // that needs to be checked for access on all levels, we simply check
+    // whether we have the menu already in cache, or otherwise, build a minimum
+    // tree containing the breadcrumb/active trail only.
+    // @see menu_set_active_trail()
+    if (!isset($tree[$cid]) && $only_active_trail) {
+      $cid .= ':trail';
+    }
+
+    if (!isset($tree[$cid])) {
+      // If the static variable doesn't have the data, check {cache_menu}.
+      $cache = cache_get($cid, 'cache_menu');
+      if ($cache && isset($cache->data)) {
+        // If the cache entry exists, it contains the parameters for
+        // menu_build_tree().
+        $tree_parameters = $cache->data;
+      }
+      // If the tree data was not in the cache, build $tree_parameters.
+      if (!isset($tree_parameters)) {
+        $tree_parameters = array(
+          'min_depth' => 1,
+          'max_depth' => $max_depth,
+        );
+        // Parent mlids; used both as key and value to ensure uniqueness.
+        // We always want all the top-level links with plid == 0.
+        $active_trail = array(0 => 0);
+
+        // If the item for the current page is accessible, build the tree
+        // parameters accordingly.
+        if ($item['access']) {
+          // Find a menu link corresponding to the current path. If $active_path
+          // is NULL, let menu_link_get_preferred() determine the path.
+          if ($active_link = menu_link_get_preferred($active_path, $menu_name)) {
+            // The active link may only be taken into account to build the
+            // active trail, if it resides in the requested menu. Otherwise,
+            // we'd needlessly re-run _menu_build_tree() queries for every menu
+            // on every page.
+            if ($active_link['menu_name'] == $menu_name) {
+              // Use all the coordinates, except the last one because there
+              // can be no child beyond the last column.
+              for ($i = 1; $i < MENU_MAX_DEPTH; $i++) {
+                if ($active_link['p' . $i]) {
+                  $active_trail[$active_link['p' . $i]] = $active_link['p' . $i];
+                }
+              }
+              // If we are asked to build links for the active trail only, skip
+              // the entire 'expanded' handling.
+              if ($only_active_trail) {
+                $tree_parameters['only_active_trail'] = TRUE;
+              }
+            }
+          }
+          $parents = $active_trail;
+
+          $expanded = variable_get('menu_expanded', array());
+          // Check whether the current menu has any links set to be expanded.
+          if (!$only_active_trail && in_array($menu_name, $expanded)) {
+            // Collect all the links set to be expanded, and then add all of
+            // their children to the list as well.
+            do {
+              $result = db_select('menu_links', NULL, array('fetch' => PDO::FETCH_ASSOC))
+                ->fields('menu_links', array('mlid'))
+                ->condition('menu_name', $menu_name)
+                ->condition('expanded', 1)
+                ->condition('has_children', 1)
+                ->condition('plid', $parents, 'IN')
+                ->condition('mlid', $parents, 'NOT IN')
+                ->execute();
+              $num_rows = FALSE;
+              foreach ($result as $item) {
+                $parents[$item['mlid']] = $item['mlid'];
+                $num_rows = TRUE;
+              }
+            } while ($num_rows);
+          }
+          $tree_parameters['expanded'] = $parents;
+          $tree_parameters['active_trail'] = $active_trail;
+        }
+        // If access is denied, we only show top-level links in menus.
+        else {
+          $tree_parameters['expanded'] = $active_trail;
+          $tree_parameters['active_trail'] = $active_trail;
+        }
+        // Cache the tree building parameters using the page-specific cid.
+        cache_set($cid, $tree_parameters, 'cache_menu');
+      }
+
+      // Build the tree using the parameters; the resulting tree will be cached
+      // by _menu_build_tree().
+      $tree[$cid] = menu_build_tree($menu_name, $tree_parameters);
+    }
+    return $tree[$cid];
+  }
+
+  return array();
+}
+
+/**
+ * Builds a menu tree, translates links, and checks access.
+ *
+ * @param $menu_name
+ *   The name of the menu.
+ * @param $parameters
+ *   (optional) An associative array of build parameters. Possible keys:
+ *   - expanded: An array of parent link ids to return only menu links that are
+ *     children of one of the plids in this list. If empty, the whole menu tree
+ *     is built, unless 'only_active_trail' is TRUE.
+ *   - active_trail: An array of mlids, representing the coordinates of the
+ *     currently active menu link.
+ *   - only_active_trail: Whether to only return links that are in the active
+ *     trail. This option is ignored, if 'expanded' is non-empty. Internally
+ *     used for breadcrumbs.
+ *   - min_depth: The minimum depth of menu links in the resulting tree.
+ *     Defaults to 1, which is the default to build a whole tree for a menu
+ *     (excluding menu container itself).
+ *   - max_depth: The maximum depth of menu links in the resulting tree.
+ *   - conditions: An associative array of custom database select query
+ *     condition key/value pairs; see _menu_build_tree() for the actual query.
+ *
+ * @return
+ *   A fully built menu tree.
+ */
+function menu_build_tree($menu_name, array $parameters = array()) {
+  // Build the menu tree.
+  $data = _menu_build_tree($menu_name, $parameters);
+  // Check access for the current user to each item in the tree.
+  menu_tree_check_access($data['tree'], $data['node_links']);
+  return $data['tree'];
+}
+
+/**
+ * Builds a menu tree.
+ *
+ * This function may be used build the data for a menu tree only, for example
+ * to further massage the data manually before further processing happens.
+ * menu_tree_check_access() needs to be invoked afterwards.
+ *
+ * @see menu_build_tree()
+ */
+function _menu_build_tree($menu_name, array $parameters = array()) {
+  // Static cache of already built menu trees.
+  $trees = &drupal_static(__FUNCTION__, array());
+
+  // Build the cache id; sort parents to prevent duplicate storage and remove
+  // default parameter values.
+  if (isset($parameters['expanded'])) {
+    sort($parameters['expanded']);
+  }
+  $tree_cid = 'links:' . $menu_name . ':tree-data:' . $GLOBALS['language']->language . ':' . hash('sha256', serialize($parameters));
+
+  // If we do not have this tree in the static cache, check {cache_menu}.
+  if (!isset($trees[$tree_cid])) {
+    $cache = cache_get($tree_cid, 'cache_menu');
+    if ($cache && isset($cache->data)) {
+      $trees[$tree_cid] = $cache->data;
+    }
+  }
+
+  if (!isset($trees[$tree_cid])) {
+    // Select the links from the table, and recursively build the tree. We
+    // LEFT JOIN since there is no match in {menu_router} for an external
+    // link.
+    $query = db_select('menu_links', 'ml', array('fetch' => PDO::FETCH_ASSOC));
+    $query->addTag('translatable');
+    $query->leftJoin('menu_router', 'm', 'm.path = ml.router_path');
+    $query->fields('ml');
+    $query->fields('m', array(
+      'load_functions',
+      'to_arg_functions',
+      'access_callback',
+      'access_arguments',
+      'page_callback',
+      'page_arguments',
+      'delivery_callback',
+      'tab_parent',
+      'tab_root',
+      'title',
+      'title_callback',
+      'title_arguments',
+      'theme_callback',
+      'theme_arguments',
+      'type',
+      'description',
+    ));
+    for ($i = 1; $i <= MENU_MAX_DEPTH; $i++) {
+      $query->orderBy('p' . $i, 'ASC');
+    }
+    $query->condition('ml.menu_name', $menu_name);
+    if (!empty($parameters['expanded'])) {
+      $query->condition('ml.plid', $parameters['expanded'], 'IN');
+    }
+    elseif (!empty($parameters['only_active_trail'])) {
+      $query->condition('ml.mlid', $parameters['active_trail'], 'IN');
+    }
+    $min_depth = (isset($parameters['min_depth']) ? $parameters['min_depth'] : 1);
+    if ($min_depth != 1) {
+      $query->condition('ml.depth', $min_depth, '>=');
+    }
+    if (isset($parameters['max_depth'])) {
+      $query->condition('ml.depth', $parameters['max_depth'], '<=');
+    }
+    // Add custom query conditions, if any were passed.
+    if (isset($parameters['conditions'])) {
+      foreach ($parameters['conditions'] as $column => $value) {
+        $query->condition($column, $value);
+      }
+    }
+
+    // Build an ordered array of links using the query result object.
+    $links = array();
+    foreach ($query->execute() as $item) {
+      $links[] = $item;
+    }
+    $active_trail = (isset($parameters['active_trail']) ? $parameters['active_trail'] : array());
+    $data['tree'] = menu_tree_data($links, $active_trail, $min_depth);
+    $data['node_links'] = array();
+    menu_tree_collect_node_links($data['tree'], $data['node_links']);
+
+    // Cache the data, if it is not already in the cache.
+    cache_set($tree_cid, $data, 'cache_menu');
+    $trees[$tree_cid] = $data;
+  }
+
+  return $trees[$tree_cid];
+}
+
+/**
+ * Collects node links from a given menu tree recursively.
+ *
+ * @param $tree
+ *   The menu tree you wish to collect node links from.
+ * @param $node_links
+ *   An array in which to store the collected node links.
+ */
+function menu_tree_collect_node_links(&$tree, &$node_links) {
+  foreach ($tree as $key => $v) {
+    if ($tree[$key]['link']['router_path'] == 'node/%') {
+      $nid = substr($tree[$key]['link']['link_path'], 5);
+      if (is_numeric($nid)) {
+        $node_links[$nid][$tree[$key]['link']['mlid']] = &$tree[$key]['link'];
+        $tree[$key]['link']['access'] = FALSE;
+      }
+    }
+    if ($tree[$key]['below']) {
+      menu_tree_collect_node_links($tree[$key]['below'], $node_links);
+    }
+  }
+}
+
+/**
+ * Checks access and performs dynamic operations for each link in the tree.
+ *
+ * @param $tree
+ *   The menu tree you wish to operate on.
+ * @param $node_links
+ *   A collection of node link references generated from $tree by
+ *   menu_tree_collect_node_links().
+ */
+function menu_tree_check_access(&$tree, $node_links = array()) {
+  if ($node_links && (user_access('access content') || user_access('bypass node access'))) {
+    $nids = array_keys($node_links);
+    $select = db_select('node', 'n');
+    $select->addField('n', 'nid');
+    $select->condition('n.status', 1);
+    $select->condition('n.nid', $nids, 'IN');
+    $select->addTag('node_access');
+    $nids = $select->execute()->fetchCol();
+    foreach ($nids as $nid) {
+      foreach ($node_links[$nid] as $mlid => $link) {
+        $node_links[$nid][$mlid]['access'] = TRUE;
+      }
+    }
+  }
+  _menu_tree_check_access($tree);
+}
+
+/**
+ * Sorts the menu tree and recursively checks access for each item.
+ */
+function _menu_tree_check_access(&$tree) {
+  $new_tree = array();
+  foreach ($tree as $key => $v) {
+    $item = &$tree[$key]['link'];
+    _menu_link_translate($item);
+    if ($item['access'] || ($item['in_active_trail'] && strpos($item['href'], '%') !== FALSE)) {
+      if ($tree[$key]['below']) {
+        _menu_tree_check_access($tree[$key]['below']);
+      }
+      // The weights are made a uniform 5 digits by adding 50000 as an offset.
+      // After _menu_link_translate(), $item['title'] has the localized link title.
+      // Adding the mlid to the end of the index insures that it is unique.
+      $new_tree[(50000 + $item['weight']) . ' ' . $item['title'] . ' ' . $item['mlid']] = $tree[$key];
+    }
+  }
+  // Sort siblings in the tree based on the weights and localized titles.
+  ksort($new_tree);
+  $tree = $new_tree;
+}
+
+/**
+ * Sorts and returns the built data representing a menu tree.
+ *
+ * @param $links
+ *   A flat array of menu links that are part of the menu. Each array element
+ *   is an associative array of information about the menu link, containing the
+ *   fields from the {menu_links} table, and optionally additional information
+ *   from the {menu_router} table, if the menu item appears in both tables.
+ *   This array must be ordered depth-first. See _menu_build_tree() for a sample
+ *   query.
+ * @param $parents
+ *   An array of the menu link ID values that are in the path from the current
+ *   page to the root of the menu tree.
+ * @param $depth
+ *   The minimum depth to include in the returned menu tree.
+ *
+ * @return
+ *   An array of menu links in the form of a tree. Each item in the tree is an
+ *   associative array containing:
+ *   - link: The menu link item from $links, with additional element
+ *     'in_active_trail' (TRUE if the link ID was in $parents).
+ *   - below: An array containing the sub-tree of this item, where each element
+ *     is a tree item array with 'link' and 'below' elements. This array will be
+ *     empty if the menu item has no items in its sub-tree having a depth
+ *     greater than or equal to $depth.
+ */
+function menu_tree_data(array $links, array $parents = array(), $depth = 1) {
+  // Reverse the array so we can use the more efficient array_pop() function.
+  $links = array_reverse($links);
+  return _menu_tree_data($links, $parents, $depth);
+}
+
+/**
+ * Builds the data representing a menu tree.
+ *
+ * The function is a bit complex because the rendering of a link depends on
+ * the next menu link.
+ */
+function _menu_tree_data(&$links, $parents, $depth) {
+  $tree = array();
+  while ($item = array_pop($links)) {
+    // We need to determine if we're on the path to root so we can later build
+    // the correct active trail and breadcrumb.
+    $item['in_active_trail'] = in_array($item['mlid'], $parents);
+    // Add the current link to the tree.
+    $tree[$item['mlid']] = array(
+      'link' => $item,
+      'below' => array(),
+    );
+    // Look ahead to the next link, but leave it on the array so it's available
+    // to other recursive function calls if we return or build a sub-tree.
+    $next = end($links);
+    // Check whether the next link is the first in a new sub-tree.
+    if ($next && $next['depth'] > $depth) {
+      // Recursively call _menu_tree_data to build the sub-tree.
+      $tree[$item['mlid']]['below'] = _menu_tree_data($links, $parents, $next['depth']);
+      // Fetch next link after filling the sub-tree.
+      $next = end($links);
+    }
+    // Determine if we should exit the loop and return.
+    if (!$next || $next['depth'] < $depth) {
+      break;
+    }
+  }
+  return $tree;
+}
+
+/**
+ * Implements template_preprocess_HOOK() for theme_menu_tree().
+ */
+function template_preprocess_menu_tree(&$variables) {
+  $variables['#tree'] = $variables['tree'];
+  $variables['tree'] = $variables['tree']['#children'];
+}
+
+/**
+ * Returns HTML for a wrapper for a menu sub-tree.
+ *
+ * @param $variables
+ *   An associative array containing:
+ *   - tree: An HTML string containing the tree's items.
+ *
+ * @see template_preprocess_menu_tree()
+ * @ingroup themeable
+ */
+function theme_menu_tree($variables) {
+  return '<ul class="menu">' . $variables['tree'] . '</ul>';
+}
+
+/**
+ * Returns HTML for a menu link and submenu.
+ *
+ * @param $variables
+ *   An associative array containing:
+ *   - element: Structured array data for a menu link.
+ *
+ * @ingroup themeable
+ */
+function theme_menu_link(array $variables) {
+  $element = $variables['element'];
+  $sub_menu = '';
+
+  if ($element['#below']) {
+    $sub_menu = drupal_render($element['#below']);
+  }
+  $output = l($element['#title'], $element['#href'], $element['#localized_options']);
+  return '<li' . drupal_attributes($element['#attributes']) . '>' . $output . $sub_menu . "</li>\n";
+}
+
+/**
+ * Returns HTML for a single local task link.
+ *
+ * @param $variables
+ *   An associative array containing:
+ *   - element: A render element containing:
+ *     - #link: A menu link array with 'title', 'href', and 'localized_options'
+ *       keys.
+ *     - #active: A boolean indicating whether the local task is active.
+ *
+ * @ingroup themeable
+ */
+function theme_menu_local_task($variables) {
+  $link = $variables['element']['#link'];
+  $link_text = $link['title'];
+
+  if (!empty($variables['element']['#active'])) {
+    // Add text to indicate active tab for non-visual users.
+    $active = '<span class="element-invisible">' . t('(active tab)') . '</span>';
+
+    // If the link does not contain HTML already, check_plain() it now.
+    // After we set 'html'=TRUE the link will not be sanitized by l().
+    if (empty($link['localized_options']['html'])) {
+      $link['title'] = check_plain($link['title']);
+    }
+    $link['localized_options']['html'] = TRUE;
+    $link_text = t('!local-task-title!active', array('!local-task-title' => $link['title'], '!active' => $active));
+  }
+
+  return '<li' . (!empty($variables['element']['#active']) ? ' class="active"' : '') . '>' . l($link_text, $link['href'], $link['localized_options']) . "</li>\n";
+}
+
+/**
+ * Returns HTML for a single local action link.
+ *
+ * @param $variables
+ *   An associative array containing:
+ *   - element: A render element containing:
+ *     - #link: A menu link array with 'title', 'href', and 'localized_options'
+ *       keys.
+ *
+ * @ingroup themeable
+ */
+function theme_menu_local_action($variables) {
+  $link = $variables['element']['#link'];
+
+  $output = '<li>';
+  if (isset($link['href'])) {
+    $output .= l($link['title'], $link['href'], isset($link['localized_options']) ? $link['localized_options'] : array());
+  }
+  elseif (!empty($link['localized_options']['html'])) {
+    $output .= $link['title'];
+  }
+  else {
+    $output .= check_plain($link['title']);
+  }
+  $output .= "</li>\n";
+
+  return $output;
+}
+
+/**
+ * Generates elements for the $arg array in the help hook.
+ */
+function drupal_help_arg($arg = array()) {
+  // Note - the number of empty elements should be > MENU_MAX_PARTS.
+  return $arg + array('', '', '', '', '', '', '', '', '', '', '', '');
+}
+
+/**
+ * Returns the help associated with the active menu item.
+ */
+function menu_get_active_help() {
+  $output = '';
+  $router_path = menu_tab_root_path();
+  // We will always have a path unless we are on a 403 or 404.
+  if (!$router_path) {
+    return '';
+  }
+
+  $arg = drupal_help_arg(arg(NULL));
+
+  foreach (module_implements('help') as $module) {
+    $function = $module . '_help';
+    // Lookup help for this path.
+    if ($help = $function($router_path, $arg)) {
+      $output .= $help . "\n";
+    }
+  }
+  return $output;
+}
+
+/**
+ * Gets the custom theme for the current page, if there is one.
+ *
+ * @param $initialize
+ *   This parameter should only be used internally; it is set to TRUE in order
+ *   to force the custom theme to be initialized for the current page request.
+ *
+ * @return
+ *   The machine-readable name of the custom theme, if there is one.
+ *
+ * @see menu_set_custom_theme()
+ */
+function menu_get_custom_theme($initialize = FALSE) {
+  $custom_theme = &drupal_static(__FUNCTION__);
+  // Skip this if the site is offline or being installed or updated, since the
+  // menu system may not be correctly initialized then.
+  if ($initialize && !_menu_site_is_offline(TRUE) && (!defined('MAINTENANCE_MODE') || (MAINTENANCE_MODE != 'update' && MAINTENANCE_MODE != 'install'))) {
+    // First allow modules to dynamically set a custom theme for the current
+    // page. Since we can only have one, the last module to return a valid
+    // theme takes precedence.
+    $custom_themes = array_filter(module_invoke_all('custom_theme'), 'drupal_theme_access');
+    if (!empty($custom_themes)) {
+      $custom_theme = array_pop($custom_themes);
+    }
+    // If there is a theme callback function for the current page, execute it.
+    // If this returns a valid theme, it will override any theme that was set
+    // by a hook_custom_theme() implementation above.
+    $router_item = menu_get_item();
+    if (!empty($router_item['access']) && !empty($router_item['theme_callback']) && function_exists($router_item['theme_callback'])) {
+      $theme_name = call_user_func_array($router_item['theme_callback'], $router_item['theme_arguments']);
+      if (drupal_theme_access($theme_name)) {
+        $custom_theme = $theme_name;
+      }
+    }
+  }
+  return $custom_theme;
+}
+
+/**
+ * Sets a custom theme for the current page, if there is one.
+ */
+function menu_set_custom_theme() {
+  menu_get_custom_theme(TRUE);
+}
+
+/**
+ * Build a list of named menus.
+ */
+function menu_get_names() {
+  $names = &drupal_static(__FUNCTION__);
+
+  if (empty($names)) {
+    $names = db_select('menu_links')
+      ->distinct()
+      ->fields('menu_links', array('menu_name'))
+      ->orderBy('menu_name')
+      ->execute()->fetchCol();
+  }
+  return $names;
+}
+
+/**
+ * Returns an array containing the names of system-defined (default) menus.
+ */
+function menu_list_system_menus() {
+  return array(
+    'navigation' => 'Navigation',
+    'management' => 'Management',
+    'user-menu' => 'User menu',
+    'main-menu' => 'Main menu',
+  );
+}
+
+/**
+ * Returns an array of links to be rendered as the Main menu.
+ */
+function menu_main_menu() {
+  return menu_navigation_links(variable_get('menu_main_links_source', 'main-menu'));
+}
+
+/**
+ * Returns an array of links to be rendered as the Secondary links.
+ */
+function menu_secondary_menu() {
+
+  // If the secondary menu source is set as the primary menu, we display the
+  // second level of the primary menu.
+  if (variable_get('menu_secondary_links_source', 'user-menu') == variable_get('menu_main_links_source', 'main-menu')) {
+    return menu_navigation_links(variable_get('menu_main_links_source', 'main-menu'), 1);
+  }
+  else {
+    return menu_navigation_links(variable_get('menu_secondary_links_source', 'user-menu'), 0);
+  }
+}
+
+/**
+ * Returns an array of links for a navigation menu.
+ *
+ * @param $menu_name
+ *   The name of the menu.
+ * @param $level
+ *   Optional, the depth of the menu to be returned.
+ *
+ * @return
+ *   An array of links of the specified menu and level.
+ */
+function menu_navigation_links($menu_name, $level = 0) {
+  // Don't even bother querying the menu table if no menu is specified.
+  if (empty($menu_name)) {
+    return array();
+  }
+
+  // Get the menu hierarchy for the current page.
+  $tree = menu_tree_page_data($menu_name, $level + 1);
+
+  // Go down the active trail until the right level is reached.
+  while ($level-- > 0 && $tree) {
+    // Loop through the current level's items until we find one that is in trail.
+    while ($item = array_shift($tree)) {
+      if ($item['link']['in_active_trail']) {
+        // If the item is in the active trail, we continue in the subtree.
+        $tree = empty($item['below']) ? array() : $item['below'];
+        break;
+      }
+    }
+  }
+
+  // Create a single level of links.
+  $router_item = menu_get_item();
+  $links = array();
+  foreach ($tree as $item) {
+    if (!$item['link']['hidden']) {
+      $class = '';
+      $l = $item['link']['localized_options'];
+      $l['href'] = $item['link']['href'];
+      $l['title'] = $item['link']['title'];
+      if ($item['link']['in_active_trail']) {
+        $class = ' active-trail';
+        $l['attributes']['class'][] = 'active-trail';
+      }
+      // Normally, l() compares the href of every link with $_GET['q'] and sets
+      // the active class accordingly. But local tasks do not appear in menu
+      // trees, so if the current path is a local task, and this link is its
+      // tab root, then we have to set the class manually.
+      if ($item['link']['href'] == $router_item['tab_root_href'] && $item['link']['href'] != $_GET['q']) {
+        $l['attributes']['class'][] = 'active';
+      }
+      // Keyed with the unique mlid to generate classes in theme_links().
+      $links['menu-' . $item['link']['mlid'] . $class] = $l;
+    }
+  }
+  return $links;
+}
+
+/**
+ * Collects the local tasks (tabs), action links, and the root path.
+ *
+ * @param $level
+ *   The level of tasks you ask for. Primary tasks are 0, secondary are 1.
+ *
+ * @return
+ *   An array containing
+ *   - tabs: Local tasks for the requested level:
+ *     - count: The number of local tasks.
+ *     - output: The themed output of local tasks.
+ *   - actions: Action links for the requested level:
+ *     - count: The number of action links.
+ *     - output: The themed output of action links.
+ *   - root_path: The router path for the current page. If the current page is
+ *     a default local task, then this corresponds to the parent tab.
+ */
+function menu_local_tasks($level = 0) {
+  $data = &drupal_static(__FUNCTION__);
+  $root_path = &drupal_static(__FUNCTION__ . ':root_path', '');
+  $empty = array(
+    'tabs' => array('count' => 0, 'output' => array()),
+    'actions' => array('count' => 0, 'output' => array()),
+    'root_path' => &$root_path,
+  );
+
+  if (!isset($data)) {
+    $data = array();
+    // Set defaults in case there are no actions or tabs.
+    $actions = $empty['actions'];
+    $tabs = array();
+
+    $router_item = menu_get_item();
+
+    // If this router item points to its parent, start from the parents to
+    // compute tabs and actions.
+    if ($router_item && ($router_item['type'] & MENU_LINKS_TO_PARENT)) {
+      $router_item = menu_get_item($router_item['tab_parent_href']);
+    }
+
+    // If we failed to fetch a router item or the current user doesn't have
+    // access to it, don't bother computing the tabs.
+    if (!$router_item || !$router_item['access']) {
+      return $empty;
+    }
+
+    // Get all tabs (also known as local tasks) and the root page.
+    $cid = 'local_tasks:' . $router_item['tab_root'];
+    if ($cache = cache_get($cid, 'cache_menu')) {
+      $result = $cache->data;
+    }
+    else {
+      $result = db_select('menu_router', NULL, array('fetch' => PDO::FETCH_ASSOC))
+        ->fields('menu_router')
+        ->condition('tab_root', $router_item['tab_root'])
+        ->condition('context', MENU_CONTEXT_INLINE, '<>')
+        ->orderBy('weight')
+        ->orderBy('title')
+        ->execute()
+        ->fetchAll();
+      cache_set($cid, $result, 'cache_menu');
+    }
+    $map = $router_item['original_map'];
+    $children = array();
+    $tasks = array();
+    $root_path = $router_item['path'];
+
+    foreach ($result as $item) {
+      _menu_translate($item, $map, TRUE);
+      if ($item['tab_parent']) {
+        // All tabs, but not the root page.
+        $children[$item['tab_parent']][$item['path']] = $item;
+      }
+      // Store the translated item for later use.
+      $tasks[$item['path']] = $item;
+    }
+
+    // Find all tabs below the current path.
+    $path = $router_item['path'];
+    // Tab parenting may skip levels, so the number of parts in the path may not
+    // equal the depth. Thus we use the $depth counter (offset by 1000 for ksort).
+    $depth = 1001;
+    $actions['count'] = 0;
+    $actions['output'] = array();
+    while (isset($children[$path])) {
+      $tabs_current = array();
+      $actions_current = array();
+      $next_path = '';
+      $tab_count = 0;
+      $action_count = 0;
+      foreach ($children[$path] as $item) {
+        // Local tasks can be normal items too, so bitmask with
+        // MENU_IS_LOCAL_TASK before checking.
+        if (!($item['type'] & MENU_IS_LOCAL_TASK)) {
+          // This item is not a tab, skip it.
+          continue;
+        }
+        if ($item['access']) {
+          $link = $item;
+          // The default task is always active. As tabs can be normal items
+          // too, so bitmask with MENU_LINKS_TO_PARENT before checking.
+          if (($item['type'] & MENU_LINKS_TO_PARENT) == MENU_LINKS_TO_PARENT) {
+            // Find the first parent which is not a default local task or action.
+            for ($p = $item['tab_parent']; ($tasks[$p]['type'] & MENU_LINKS_TO_PARENT) == MENU_LINKS_TO_PARENT; $p = $tasks[$p]['tab_parent']);
+            // Use the path of the parent instead.
+            $link['href'] = $tasks[$p]['href'];
+            // Mark the link as active, if the current path happens to be the
+            // path of the default local task itself (i.e., instead of its
+            // tab_parent_href or tab_root_href). Normally, links for default
+            // local tasks link to their parent, but the path of default local
+            // tasks can still be accessed directly, in which case this link
+            // would not be marked as active, since l() only compares the href
+            // with $_GET['q'].
+            if ($link['href'] != $_GET['q']) {
+              $link['localized_options']['attributes']['class'][] = 'active';
+            }
+            $tabs_current[] = array(
+              '#theme' => 'menu_local_task',
+              '#link' => $link,
+              '#active' => TRUE,
+            );
+            $next_path = $item['path'];
+            $tab_count++;
+          }
+          else {
+            // Actions can be normal items too, so bitmask with
+            // MENU_IS_LOCAL_ACTION before checking.
+            if (($item['type'] & MENU_IS_LOCAL_ACTION) == MENU_IS_LOCAL_ACTION) {
+              // The item is an action, display it as such.
+              $actions_current[] = array(
+                '#theme' => 'menu_local_action',
+                '#link' => $link,
+              );
+              $action_count++;
+            }
+            else {
+              // Otherwise, it's a normal tab.
+              $tabs_current[] = array(
+                '#theme' => 'menu_local_task',
+                '#link' => $link,
+              );
+              $tab_count++;
+            }
+          }
+        }
+      }
+      $path = $next_path;
+      $tabs[$depth]['count'] = $tab_count;
+      $tabs[$depth]['output'] = $tabs_current;
+      $actions['count'] += $action_count;
+      $actions['output'] = array_merge($actions['output'], $actions_current);
+      $depth++;
+    }
+    $data['actions'] = $actions;
+    // Find all tabs at the same level or above the current one.
+    $parent = $router_item['tab_parent'];
+    $path = $router_item['path'];
+    $current = $router_item;
+    $depth = 1000;
+    while (isset($children[$parent])) {
+      $tabs_current = array();
+      $next_path = '';
+      $next_parent = '';
+      $count = 0;
+      foreach ($children[$parent] as $item) {
+        // Skip local actions.
+        if ($item['type'] & MENU_IS_LOCAL_ACTION) {
+          continue;
+        }
+        if ($item['access']) {
+          $count++;
+          $link = $item;
+          // Local tasks can be normal items too, so bitmask with
+          // MENU_LINKS_TO_PARENT before checking.
+          if (($item['type'] & MENU_LINKS_TO_PARENT) == MENU_LINKS_TO_PARENT) {
+            // Find the first parent which is not a default local task.
+            for ($p = $item['tab_parent']; ($tasks[$p]['type'] & MENU_LINKS_TO_PARENT) == MENU_LINKS_TO_PARENT; $p = $tasks[$p]['tab_parent']);
+            // Use the path of the parent instead.
+            $link['href'] = $tasks[$p]['href'];
+            if ($item['path'] == $router_item['path']) {
+              $root_path = $tasks[$p]['path'];
+            }
+          }
+          // We check for the active tab.
+          if ($item['path'] == $path) {
+            // Mark the link as active, if the current path is a (second-level)
+            // local task of a default local task. Since this default local task
+            // links to its parent, l() will not mark it as active, as it only
+            // compares the link's href to $_GET['q'].
+            if ($link['href'] != $_GET['q']) {
+              $link['localized_options']['attributes']['class'][] = 'active';
+            }
+            $tabs_current[] = array(
+              '#theme' => 'menu_local_task',
+              '#link' => $link,
+              '#active' => TRUE,
+            );
+            $next_path = $item['tab_parent'];
+            if (isset($tasks[$next_path])) {
+              $next_parent = $tasks[$next_path]['tab_parent'];
+            }
+          }
+          else {
+            $tabs_current[] = array(
+              '#theme' => 'menu_local_task',
+              '#link' => $link,
+            );
+          }
+        }
+      }
+      $path = $next_path;
+      $parent = $next_parent;
+      $tabs[$depth]['count'] = $count;
+      $tabs[$depth]['output'] = $tabs_current;
+      $depth--;
+    }
+    // Sort by depth.
+    ksort($tabs);
+    // Remove the depth, we are interested only in their relative placement.
+    $tabs = array_values($tabs);
+    $data['tabs'] = $tabs;
+
+    // Allow modules to alter local tasks or dynamically append further tasks.
+    drupal_alter('menu_local_tasks', $data, $router_item, $root_path);
+  }
+
+  if (isset($data['tabs'][$level])) {
+    return array(
+      'tabs' => $data['tabs'][$level],
+      'actions' => $data['actions'],
+      'root_path' => $root_path,
+    );
+  }
+  // @todo If there are no tabs, then there still can be actions; for example,
+  //   when added via hook_menu_local_tasks_alter().
+  elseif (!empty($data['actions']['output'])) {
+    return array('actions' => $data['actions']) + $empty;
+  }
+  return $empty;
+}
+
+/**
+ * Retrieves contextual links for a path based on registered local tasks.
+ *
+ * This leverages the menu system to retrieve the first layer of registered
+ * local tasks for a given system path. All local tasks of the tab type
+ * MENU_CONTEXT_INLINE are taken into account.
+ *
+ * For example, when considering the following registered local tasks:
+ * - node/%node/view (default local task) with no 'context' defined
+ * - node/%node/edit with context: MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE
+ * - node/%node/revisions with context: MENU_CONTEXT_PAGE
+ * - node/%node/report-as-spam with context: MENU_CONTEXT_INLINE
+ *
+ * If the path "node/123" is passed to this function, then it will return the
+ * links for 'edit' and 'report-as-spam'.
+ *
+ * @param $module
+ *   The name of the implementing module. This is used to prefix the key for
+ *   each contextual link, which is transformed into a CSS class during
+ *   rendering by theme_links(). For example, if $module is 'block' and the
+ *   retrieved local task path argument is 'edit', then the resulting CSS class
+ *   will be 'block-edit'.
+ * @param $parent_path
+ *   The static menu router path of the object to retrieve local tasks for, for
+ *   example 'node' or 'admin/structure/block/manage'.
+ * @param $args
+ *   A list of dynamic path arguments to append to $parent_path to form the
+ *   fully-qualified menu router path; for example, array(123) for a certain
+ *   node or array('system', 'navigation') for a certain block.
+ *
+ * @return
+ *   A list of menu router items that are local tasks for the passed-in path.
+ *
+ * @see contextual_links_preprocess()
+ * @see hook_menu()
+ */
+function menu_contextual_links($module, $parent_path, $args) {
+  static $path_empty = array();
+
+  $links = array();
+  // Performance: In case a previous invocation for the same parent path did not
+  // return any links, we immediately return here.
+  if (isset($path_empty[$parent_path]) && strpos($parent_path, '%') !== FALSE) {
+    return $links;
+  }
+  // Construct the item-specific parent path.
+  $path = $parent_path . '/' . implode('/', $args);
+
+  // Get the router item for the given parent link path.
+  $router_item = menu_get_item($path);
+  if (!$router_item || !$router_item['access']) {
+    $path_empty[$parent_path] = TRUE;
+    return $links;
+  }
+  $data = &drupal_static(__FUNCTION__, array());
+  $root_path = $router_item['path'];
+
+  // Performance: For a single, normalized path (such as 'node/%') we only query
+  // available tasks once per request.
+  if (!isset($data[$root_path])) {
+    // Get all contextual links that are direct children of the router item and
+    // not of the tab type 'view'.
+    $data[$root_path] = db_select('menu_router', 'm')
+      ->fields('m')
+      ->condition('tab_parent', $router_item['tab_root'])
+      ->condition('context', MENU_CONTEXT_NONE, '<>')
+      ->condition('context', MENU_CONTEXT_PAGE, '<>')
+      ->orderBy('weight')
+      ->orderBy('title')
+      ->execute()
+      ->fetchAllAssoc('path', PDO::FETCH_ASSOC);
+  }
+  $parent_length = drupal_strlen($root_path) + 1;
+  $map = $router_item['original_map'];
+  foreach ($data[$root_path] as $item) {
+    // Extract the actual "task" string from the path argument.
+    $key = drupal_substr($item['path'], $parent_length);
+
+    // Denormalize and translate the contextual link.
+    _menu_translate($item, $map, TRUE);
+    if (!$item['access']) {
+      continue;
+    }
+    // All contextual links are keyed by the actual "task" path argument,
+    // prefixed with the name of the implementing module.
+    $links[$module . '-' . $key] = $item;
+  }
+
+  // Allow modules to alter contextual links.
+  drupal_alter('menu_contextual_links', $links, $router_item, $root_path);
+
+  // Performance: If the current user does not have access to any links for this
+  // router path and no other module added further links, we assign FALSE here
+  // to skip the entire process the next time the same router path is requested.
+  if (empty($links)) {
+    $path_empty[$parent_path] = TRUE;
+  }
+
+  return $links;
+}
+
+/**
+ * Returns the rendered local tasks at the top level.
+ */
+function menu_primary_local_tasks() {
+  $links = menu_local_tasks(0);
+  // Do not display single tabs.
+  return ($links['tabs']['count'] > 1 ? $links['tabs']['output'] : '');
+}
+
+/**
+ * Returns the rendered local tasks at the second level.
+ */
+function menu_secondary_local_tasks() {
+  $links = menu_local_tasks(1);
+  // Do not display single tabs.
+  return ($links['tabs']['count'] > 1 ? $links['tabs']['output'] : '');
+}
+
+/**
+ * Returns the rendered local actions at the current level.
+ */
+function menu_local_actions() {
+  $links = menu_local_tasks();
+  return $links['actions']['output'];
+}
+
+/**
+ * Returns the router path, or the path for a default local task's parent.
+ */
+function menu_tab_root_path() {
+  $links = menu_local_tasks();
+  return $links['root_path'];
+}
+
+/**
+ * Returns a renderable element for the primary and secondary tabs.
+ */
+function menu_local_tabs() {
+  return array(
+    '#theme' => 'menu_local_tasks',
+    '#primary' => menu_primary_local_tasks(),
+    '#secondary' => menu_secondary_local_tasks(),
+  );
+}
+
+/**
+ * Returns HTML for primary and secondary local tasks.
+ *
+ * @param $variables
+ *   An associative array containing:
+ *     - primary: (optional) An array of local tasks (tabs).
+ *     - secondary: (optional) An array of local tasks (tabs).
+ *
+ * @ingroup themeable
+ * @see menu_local_tasks()
+ */
+function theme_menu_local_tasks(&$variables) {
+  $output = '';
+
+  if (!empty($variables['primary'])) {
+    $variables['primary']['#prefix'] = '<h2 class="element-invisible">' . t('Primary tabs') . '</h2>';
+    $variables['primary']['#prefix'] .= '<ul class="tabs primary">';
+    $variables['primary']['#suffix'] = '</ul>';
+    $output .= drupal_render($variables['primary']);
+  }
+  if (!empty($variables['secondary'])) {
+    $variables['secondary']['#prefix'] = '<h2 class="element-invisible">' . t('Secondary tabs') . '</h2>';
+    $variables['secondary']['#prefix'] .= '<ul class="tabs secondary">';
+    $variables['secondary']['#suffix'] = '</ul>';
+    $output .= drupal_render($variables['secondary']);
+  }
+
+  return $output;
+}
+
+/**
+ * Sets (or gets) the active menu for the current page.
+ *
+ * The active menu for the page determines the active trail.
+ *
+ * @return
+ *   An array of menu machine names, in order of preference. The
+ *   'menu_default_active_menus' variable may be used to assert a menu order
+ *   different from the order of creation, or to prevent a particular menu from
+ *   being used at all in the active trail.
+ *   E.g., $conf['menu_default_active_menus'] = array('navigation', 'main-menu')
+ */
+function menu_set_active_menu_names($menu_names = NULL) {
+  $active = &drupal_static(__FUNCTION__);
+
+  if (isset($menu_names) && is_array($menu_names)) {
+    $active = $menu_names;
+  }
+  elseif (!isset($active)) {
+    $active = variable_get('menu_default_active_menus', array_keys(menu_list_system_menus()));
+  }
+  return $active;
+}
+
+/**
+ * Gets the active menu for the current page.
+ */
+function menu_get_active_menu_names() {
+  return menu_set_active_menu_names();
+}
+
+/**
+ * Sets the active path, which determines which page is loaded.
+ *
+ * Note that this may not have the desired effect unless invoked very early
+ * in the page load, such as during hook_boot(), or unless you call
+ * menu_execute_active_handler() to generate your page output.
+ *
+ * @param $path
+ *   A Drupal path - not a path alias.
+ */
+function menu_set_active_item($path) {
+  $_GET['q'] = $path;
+  // Since the active item has changed, the active menu trail may also be out
+  // of date.
+  drupal_static_reset('menu_set_active_trail');
+}
+
+/**
+ * Sets the active trail (path to the menu tree root) of the current page.
+ *
+ * Any trail set by this function will only be used for functionality that calls
+ * menu_get_active_trail(). Drupal core only uses trails set here for
+ * breadcrumbs and the page title and not for menu trees or page content.
+ * Additionally, breadcrumbs set by drupal_set_breadcrumb() will override any
+ * trail set here.
+ *
+ * To affect the trail used by menu trees, use menu_tree_set_path(). To affect
+ * the page content, use menu_set_active_item() instead.
+ *
+ * @param $new_trail
+ *   Menu trail to set; the value is saved in a static variable and can be
+ *   retrieved by menu_get_active_trail(). The format of this array should be
+ *   the same as the return value of menu_get_active_trail().
+ *
+ * @return
+ *   The active trail. See menu_get_active_trail() for details.
+ */
+function menu_set_active_trail($new_trail = NULL) {
+  $trail = &drupal_static(__FUNCTION__);
+
+  if (isset($new_trail)) {
+    $trail = $new_trail;
+  }
+  elseif (!isset($trail)) {
+    $trail = array();
+    $trail[] = array(
+      'title' => t('Home'),
+      'href' => '<front>',
+      'link_path' => '',
+      'localized_options' => array(),
+      'type' => 0,
+    );
+
+    // Try to retrieve a menu link corresponding to the current path. If more
+    // than one exists, the link from the most preferred menu is returned.
+    $preferred_link = menu_link_get_preferred();
+    $current_item = menu_get_item();
+
+    // There is a link for the current path.
+    if ($preferred_link) {
+      // Pass TRUE for $only_active_trail to make menu_tree_page_data() build
+      // a stripped down menu tree containing the active trail only, in case
+      // the given menu has not been built in this request yet.
+      $tree = menu_tree_page_data($preferred_link['menu_name'], NULL, TRUE);
+      list($key, $curr) = each($tree);
+    }
+    // There is no link for the current path.
+    else {
+      $preferred_link = $current_item;
+      $curr = FALSE;
+    }
+
+    while ($curr) {
+      $link = $curr['link'];
+      if ($link['in_active_trail']) {
+        // Add the link to the trail, unless it links to its parent.
+        if (!($link['type'] & MENU_LINKS_TO_PARENT)) {
+          // The menu tree for the active trail may contain additional links
+          // that have not been translated yet, since they contain dynamic
+          // argument placeholders (%). Such links are not contained in regular
+          // menu trees, and have only been loaded for the additional
+          // translation that happens here, so as to be able to display them in
+          // the breadcrumb for the current page.
+          // @see _menu_tree_check_access()
+          // @see _menu_link_translate()
+          if (strpos($link['href'], '%') !== FALSE) {
+            _menu_link_translate($link, TRUE);
+          }
+          if ($link['access']) {
+            $trail[] = $link;
+          }
+        }
+        $tree = $curr['below'] ? $curr['below'] : array();
+      }
+      list($key, $curr) = each($tree);
+    }
+    // Make sure the current page is in the trail to build the page title, by
+    // appending either the preferred link or the menu router item for the
+    // current page. Exclude it if we are on the front page.
+    $last = end($trail);
+    if ($preferred_link && $last['href'] != $preferred_link['href'] && !drupal_is_front_page()) {
+      $trail[] = $preferred_link;
+    }
+  }
+  return $trail;
+}
+
+/**
+ * Looks up the preferred menu link for a given system path.
+ *
+ * @param $path
+ *   The path; for example, 'node/5'. The function will find the corresponding
+ *   menu link ('node/5' if it exists, or fallback to 'node/%').
+ * @param $selected_menu
+ *   The name of a menu used to restrict the search for a preferred menu link.
+ *   If not specified, all the menus returned by menu_get_active_menu_names()
+ *   will be used.
+ *
+ * @return
+ *   A fully translated menu link, or FALSE if no matching menu link was
+ *   found. The most specific menu link ('node/5' preferred over 'node/%') in
+ *   the most preferred menu (as defined by menu_get_active_menu_names()) is
+ *   returned.
+ */
+function menu_link_get_preferred($path = NULL, $selected_menu = NULL) {
+  $preferred_links = &drupal_static(__FUNCTION__);
+
+  if (!isset($path)) {
+    $path = $_GET['q'];
+  }
+
+  if (empty($selected_menu)) {
+    // Use an illegal menu name as the key for the preferred menu link.
+    $selected_menu = MENU_PREFERRED_LINK;
+  }
+
+  if (!isset($preferred_links[$path])) {
+    // Look for the correct menu link by building a list of candidate paths,
+    // which are ordered by priority (translated hrefs are preferred over
+    // untranslated paths). Afterwards, the most relevant path is picked from
+    // the menus, ordered by menu preference.
+    $item = menu_get_item($path);
+    $path_candidates = array();
+    // 1. The current item href.
+    $path_candidates[$item['href']] = $item['href'];
+    // 2. The tab root href of the current item (if any).
+    if ($item['tab_parent'] && ($tab_root = menu_get_item($item['tab_root_href']))) {
+      $path_candidates[$tab_root['href']] = $tab_root['href'];
+    }
+    // 3. The current item path (with wildcards).
+    $path_candidates[$item['path']] = $item['path'];
+    // 4. The tab root path of the current item (if any).
+    if (!empty($tab_root)) {
+      $path_candidates[$tab_root['path']] = $tab_root['path'];
+    }
+
+    // Retrieve a list of menu names, ordered by preference.
+    $menu_names = menu_get_active_menu_names();
+    // Put the selected menu at the front of the list.
+    array_unshift($menu_names, $selected_menu);
+
+    $query = db_select('menu_links', 'ml', array('fetch' => PDO::FETCH_ASSOC));
+    $query->leftJoin('menu_router', 'm', 'm.path = ml.router_path');
+    $query->fields('ml');
+    // Weight must be taken from {menu_links}, not {menu_router}.
+    $query->addField('ml', 'weight', 'link_weight');
+    $query->fields('m');
+    $query->condition('ml.link_path', $path_candidates, 'IN');
+    $query->addTag('preferred_menu_links');
+
+    // Sort candidates by link path and menu name.
+    $candidates = array();
+    foreach ($query->execute() as $candidate) {
+      $candidate['weight'] = $candidate['link_weight'];
+      $candidates[$candidate['link_path']][$candidate['menu_name']] = $candidate;
+      // Add any menus not already in the menu name search list.
+      if (!in_array($candidate['menu_name'], $menu_names)) {
+        $menu_names[] = $candidate['menu_name'];
+      }
+    }
+
+    // Store the most specific link for each menu. Also save the most specific
+    // link of the most preferred menu in $preferred_link.
+    foreach ($path_candidates as $link_path) {
+      if (isset($candidates[$link_path])) {
+        foreach ($menu_names as $menu_name) {
+          if (empty($preferred_links[$path][$menu_name]) && isset($candidates[$link_path][$menu_name])) {
+            $candidate_item = $candidates[$link_path][$menu_name];
+            $map = explode('/', $path);
+            _menu_translate($candidate_item, $map);
+            if ($candidate_item['access']) {
+              $preferred_links[$path][$menu_name] = $candidate_item;
+              if (empty($preferred_links[$path][MENU_PREFERRED_LINK])) {
+                // Store the most specific link.
+                $preferred_links[$path][MENU_PREFERRED_LINK] = $candidate_item;
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  return isset($preferred_links[$path][$selected_menu]) ? $preferred_links[$path][$selected_menu] : FALSE;
+}
+
+/**
+ * Gets the active trail (path to root menu root) of the current page.
+ *
+ * If a trail is supplied to menu_set_active_trail(), that value is returned. If
+ * a trail is not supplied to menu_set_active_trail(), the path to the current
+ * page is calculated and returned. The calculated trail is also saved as a
+ * static value for use by subsequent calls to menu_get_active_trail().
+ *
+ * @return
+ *   Path to menu root of the current page, as an array of menu link items,
+ *   starting with the site's home page. Each link item is an associative array
+ *   with the following components:
+ *   - title: Title of the item.
+ *   - href: Drupal path of the item.
+ *   - localized_options: Options for passing into the l() function.
+ *   - type: A menu type constant, such as MENU_DEFAULT_LOCAL_TASK, or 0 to
+ *     indicate it's not really in the menu (used for the home page item).
+ */
+function menu_get_active_trail() {
+  return menu_set_active_trail();
+}
+
+/**
+ * Gets the breadcrumb for the current page, as determined by the active trail.
+ *
+ * @see menu_set_active_trail()
+ */
+function menu_get_active_breadcrumb() {
+  $breadcrumb = array();
+
+  // No breadcrumb for the front page.
+  if (drupal_is_front_page()) {
+    return $breadcrumb;
+  }
+
+  $item = menu_get_item();
+  if (!empty($item['access'])) {
+    $active_trail = menu_get_active_trail();
+
+    // Allow modules to alter the breadcrumb, if possible, as that is much
+    // faster than rebuilding an entirely new active trail.
+    drupal_alter('menu_breadcrumb', $active_trail, $item);
+
+    // Don't show a link to the current page in the breadcrumb trail.
+    $end = end($active_trail);
+    if ($item['href'] == $end['href']) {
+      array_pop($active_trail);
+    }
+
+    // Remove the tab root (parent) if the current path links to its parent.
+    // Normally, the tab root link is included in the breadcrumb, as soon as we
+    // are on a local task or any other child link. However, if we are on a
+    // default local task (e.g., node/%/view), then we do not want the tab root
+    // link (e.g., node/%) to appear, as it would be identical to the current
+    // page. Since this behavior also needs to work recursively (i.e., on
+    // default local tasks of default local tasks), and since the last non-task
+    // link in the trail is used as page title (see menu_get_active_title()),
+    // this condition cannot be cleanly integrated into menu_get_active_trail().
+    // menu_get_active_trail() already skips all links that link to their parent
+    // (commonly MENU_DEFAULT_LOCAL_TASK). In order to also hide the parent link
+    // itself, we always remove the last link in the trail, if the current
+    // router item links to its parent.
+    if (($item['type'] & MENU_LINKS_TO_PARENT) == MENU_LINKS_TO_PARENT) {
+      array_pop($active_trail);
+    }
+
+    foreach ($active_trail as $parent) {
+      $breadcrumb[] = l($parent['title'], $parent['href'], $parent['localized_options']);
+    }
+  }
+  return $breadcrumb;
+}
+
+/**
+ * Gets the title of the current page, as determined by the active trail.
+ */
+function menu_get_active_title() {
+  $active_trail = menu_get_active_trail();
+  $local_task_title = NULL;
+
+  foreach (array_reverse($active_trail) as $item) {
+    // Local task titles are displayed as tabs and therefore should not be
+    // repeated as the page title. However, if the local task appears in a
+    // top-level menu, it is no longer a "local task" anymore (the front page
+    // of the site does not have tabs) so it is better to use the local task
+    // title in that case than to fall back on the front page link in the
+    // active trail (which is usually "Home" and would not make sense in this
+    // context).
+    if ((bool) ($item['type'] & MENU_IS_LOCAL_TASK)) {
+      // A local task title is being skipped; track it in case it needs to be
+      // used later.
+      $local_task_title = $item['title'];
+    }
+    else {
+      // This is not a local task, so use it for the page title (unless the
+      // conditions described above are met).
+      if (isset($local_task_title) && isset($item['href']) && $item['href'] == '<front>') {
+        return $local_task_title;
+      }
+      else {
+        return $item['title'];
+      }
+    }
+  }
+}
+
+/**
+ * Gets a translated, access-checked menu link that is ready for rendering.
+ *
+ * This function should never be called from within node_load() or any other
+ * function used as a menu object load function since an infinite recursion may
+ * occur.
+ *
+ * @param $mlid
+ *   The mlid of the menu item.
+ *
+ * @return
+ *   A menu link, with $item['access'] filled and link translated for
+ *   rendering.
+ */
+function menu_link_load($mlid) {
+  if (is_numeric($mlid)) {
+    $query = db_select('menu_links', 'ml');
+    $query->leftJoin('menu_router', 'm', 'm.path = ml.router_path');
+    $query->fields('ml');
+    // Weight should be taken from {menu_links}, not {menu_router}.
+    $query->addField('ml', 'weight', 'link_weight');
+    $query->fields('m');
+    $query->condition('ml.mlid', $mlid);
+    if ($item = $query->execute()->fetchAssoc()) {
+      $item['weight'] = $item['link_weight'];
+      _menu_link_translate($item);
+      return $item;
+    }
+  }
+  return FALSE;
+}
+
+/**
+ * Clears the cached data for a single named menu.
+ */
+function menu_cache_clear($menu_name = 'navigation') {
+  $cache_cleared = &drupal_static(__FUNCTION__, array());
+
+  if (empty($cache_cleared[$menu_name])) {
+    cache_clear_all('links:' . $menu_name . ':', 'cache_menu', TRUE);
+    $cache_cleared[$menu_name] = 1;
+  }
+  elseif ($cache_cleared[$menu_name] == 1) {
+    drupal_register_shutdown_function('cache_clear_all', 'links:' . $menu_name . ':', 'cache_menu', TRUE);
+    $cache_cleared[$menu_name] = 2;
+  }
+
+  // Also clear the menu system static caches.
+  menu_reset_static_cache();
+}
+
+/**
+ * Clears all cached menu data.
+ *
+ * This should be called any time broad changes
+ * might have been made to the router items or menu links.
+ */
+function menu_cache_clear_all() {
+  cache_clear_all('*', 'cache_menu', TRUE);
+  menu_reset_static_cache();
+}
+
+/**
+ * Resets the menu system static cache.
+ */
+function menu_reset_static_cache() {
+  drupal_static_reset('_menu_build_tree');
+  drupal_static_reset('menu_tree');
+  drupal_static_reset('menu_tree_all_data');
+  drupal_static_reset('menu_tree_page_data');
+  drupal_static_reset('menu_load_all');
+  drupal_static_reset('menu_link_get_preferred');
+}
+
+/**
+ * Checks whether a menu_rebuild() is necessary.
+ */
+function _menu_check_rebuild() {
+  // To absolutely ensure that the menu rebuild is required, re-load the
+  // variables in case they were set by another process.
+  $variables = variable_initialize();
+  if (empty($variables['menu_rebuild_needed']) && !empty($variables['menu_masks'])) {
+    unset($GLOBALS['conf']['menu_rebuild_needed']);
+    $GLOBALS['conf']['menu_masks'] = $variables['menu_masks'];
+    return FALSE;
+  }
+  return TRUE;
+}
+
+/**
+ * Populates the database tables used by various menu functions.
+ *
+ * This function will clear and populate the {menu_router} table, add entries
+ * to {menu_links} for new router items, and then remove stale items from
+ * {menu_links}. If called from update.php or install.php, it will also
+ * schedule a call to itself on the first real page load from
+ * menu_execute_active_handler(), because the maintenance page environment
+ * is different and leaves stale data in the menu tables.
+ *
+ * @return
+ *   TRUE if the menu was rebuilt, FALSE if another thread was rebuilding
+ *   in parallel and the current thread just waited for completion.
+ */
+function menu_rebuild() {
+  if (!lock_acquire('menu_rebuild')) {
+    // Wait for another request that is already doing this work.
+    // We choose to block here since otherwise the router item may not
+    // be available in menu_execute_active_handler() resulting in a 404.
+    lock_wait('menu_rebuild');
+
+    if (_menu_check_rebuild()) {
+      // If we get here and menu_masks was not set, then it is possible a menu
+      // is being reloaded, or that the process rebuilding the menu was unable
+      // to complete successfully. A missing menu_masks variable could result
+      // in a 404, so re-run the function.
+      return menu_rebuild();
+    }
+    return FALSE;
+  }
+
+  $transaction = db_transaction();
+
+  try {
+    list($menu, $masks) = menu_router_build();
+    _menu_router_save($menu, $masks);
+    _menu_navigation_links_rebuild($menu);
+    // Clear the menu, page and block caches.
+    menu_cache_clear_all();
+    _menu_clear_page_cache();
+
+    if (defined('MAINTENANCE_MODE')) {
+      variable_set('menu_rebuild_needed', TRUE);
+    }
+    else {
+      variable_del('menu_rebuild_needed');
+    }
+  }
+  catch (Exception $e) {
+    $transaction->rollback();
+    watchdog_exception('menu', $e);
+  }
+  // Explicitly commit the transaction now; this ensures that the database
+  // operations during the menu rebuild are committed before the lock is made
+  // available again, since locks may not always reside in the same database
+  // connection. The lock is acquired outside of the transaction so should also
+  // be released outside of it.
+  unset($transaction);
+
+  lock_release('menu_rebuild');
+  return TRUE;
+}
+
+/**
+ * Collects and alters the menu definitions.
+ */
+function menu_router_build() {
+  // We need to manually call each module so that we can know which module
+  // a given item came from.
+  $callbacks = array();
+  foreach (module_implements('menu') as $module) {
+    $router_items = call_user_func($module . '_menu');
+    if (isset($router_items) && is_array($router_items)) {
+      foreach (array_keys($router_items) as $path) {
+        $router_items[$path]['module'] = $module;
+      }
+      $callbacks = array_merge($callbacks, $router_items);
+    }
+  }
+  // Alter the menu as defined in modules, keys are like user/%user.
+  drupal_alter('menu', $callbacks);
+  list($menu, $masks) = _menu_router_build($callbacks);
+  _menu_router_cache($menu);
+
+  return array($menu, $masks);
+}
+
+/**
+ * Stores the menu router if we have it in memory.
+ */
+function _menu_router_cache($new_menu = NULL) {
+  $menu = &drupal_static(__FUNCTION__);
+
+  if (isset($new_menu)) {
+    $menu = $new_menu;
+  }
+  return $menu;
+}
+
+/**
+ * Gets the menu router.
+ */
+function menu_get_router() {
+  // Check first if we have it in memory already.
+  $menu = _menu_router_cache();
+  if (empty($menu)) {
+    list($menu, $masks) = menu_router_build();
+  }
+  return $menu;
+}
+
+/**
+ * Builds a link from a router item.
+ */
+function _menu_link_build($item) {
+  // Suggested items are disabled by default.
+  if ($item['type'] == MENU_SUGGESTED_ITEM) {
+    $item['hidden'] = 1;
+  }
+  // Hide all items that are not visible in the tree.
+  elseif (!($item['type'] & MENU_VISIBLE_IN_TREE)) {
+    $item['hidden'] = -1;
+  }
+  // Note, we set this as 'system', so that we can be sure to distinguish all
+  // the menu links generated automatically from entries in {menu_router}.
+  $item['module'] = 'system';
+  $item += array(
+    'menu_name' => 'navigation',
+    'link_title' => $item['title'],
+    'link_path' => $item['path'],
+    'hidden' => 0,
+    'options' => empty($item['description']) ? array() : array('attributes' => array('title' => $item['description'])),
+  );
+  return $item;
+}
+
+/**
+ * Builds menu links for the items in the menu router.
+ */
+function _menu_navigation_links_rebuild($menu) {
+  // Add normal and suggested items as links.
+  $menu_links = array();
+  foreach ($menu as $path => $item) {
+    if ($item['_visible']) {
+      $menu_links[$path] = $item;
+      $sort[$path] = $item['_number_parts'];
+    }
+  }
+  if ($menu_links) {
+    // Keep an array of processed menu links, to allow menu_link_save() to
+    // check this for parents instead of querying the database.
+    $parent_candidates = array();
+    // Make sure no child comes before its parent.
+    array_multisort($sort, SORT_NUMERIC, $menu_links);
+
+    foreach ($menu_links as $key => $item) {
+      $existing_item = db_select('menu_links')
+        ->fields('menu_links')
+        ->condition('link_path', $item['path'])
+        ->condition('module', 'system')
+        ->execute()->fetchAssoc();
+      if ($existing_item) {
+        $item['mlid'] = $existing_item['mlid'];
+        // A change in hook_menu may move the link to a different menu
+        if (empty($item['menu_name']) || ($item['menu_name'] == $existing_item['menu_name'])) {
+          $item['menu_name'] = $existing_item['menu_name'];
+          $item['plid'] = $existing_item['plid'];
+        }
+        else {
+          // It moved to a new menu. Let menu_link_save() try to find a new
+          // parent based on the path.
+          unset($item['plid']);
+        }
+        $item['has_children'] = $existing_item['has_children'];
+        $item['updated'] = $existing_item['updated'];
+      }
+      if ($existing_item && $existing_item['customized']) {
+        $parent_candidates[$existing_item['mlid']] = $existing_item;
+      }
+      else {
+        $item = _menu_link_build($item);
+        menu_link_save($item, $existing_item, $parent_candidates);
+        $parent_candidates[$item['mlid']] = $item;
+        unset($menu_links[$key]);
+      }
+    }
+  }
+  $paths = array_keys($menu);
+  // Updated and customized items whose router paths are gone need new ones.
+  $result = db_select('menu_links', NULL, array('fetch' => PDO::FETCH_ASSOC))
+    ->fields('menu_links', array(
+      'link_path',
+      'mlid',
+      'router_path',
+      'updated',
+    ))
+    ->condition(db_or()
+      ->condition('updated', 1)
+      ->condition(db_and()
+        ->condition('router_path', $paths, 'NOT IN')
+        ->condition('external', 0)
+        ->condition('customized', 1)
+      )
+    )
+    ->execute();
+  foreach ($result as $item) {
+    $router_path = _menu_find_router_path($item['link_path']);
+    if (!empty($router_path) && ($router_path != $item['router_path'] || $item['updated'])) {
+      // If the router path and the link path matches, it's surely a working
+      // item, so we clear the updated flag.
+      $updated = $item['updated'] && $router_path != $item['link_path'];
+      db_update('menu_links')
+        ->fields(array(
+          'router_path' => $router_path,
+          'updated' => (int) $updated,
+        ))
+        ->condition('mlid', $item['mlid'])
+        ->execute();
+    }
+  }
+  // Find any item whose router path does not exist any more.
+  $result = db_select('menu_links')
+    ->fields('menu_links')
+    ->condition('router_path', $paths, 'NOT IN')
+    ->condition('external', 0)
+    ->condition('updated', 0)
+    ->condition('customized', 0)
+    ->orderBy('depth', 'DESC')
+    ->execute();
+  // Remove all such items. Starting from those with the greatest depth will
+  // minimize the amount of re-parenting done by menu_link_delete().
+  foreach ($result as $item) {
+    _menu_delete_item($item, TRUE);
+  }
+}
+
+/**
+ * Clones an array of menu links.
+ *
+ * @param $links
+ *   An array of menu links to clone.
+ * @param $menu_name
+ *   (optional) The name of a menu that the links will be cloned for. If not
+ *   set, the cloned links will be in the same menu as the original set of
+ *   links that were passed in.
+ *
+ * @return
+ *   An array of menu links with the same properties as the passed-in array,
+ *   but with the link identifiers removed so that a new link will be created
+ *   when any of them is passed in to menu_link_save().
+ *
+ * @see menu_link_save()
+ */
+function menu_links_clone($links, $menu_name = NULL) {
+  foreach ($links as &$link) {
+    unset($link['mlid']);
+    unset($link['plid']);
+    if (isset($menu_name)) {
+      $link['menu_name'] = $menu_name;
+    }
+  }
+  return $links;
+}
+
+/**
+ * Returns an array containing all links for a menu.
+ *
+ * @param $menu_name
+ *   The name of the menu whose links should be returned.
+ *
+ * @return
+ *   An array of menu links.
+ */
+function menu_load_links($menu_name) {
+  $links = db_select('menu_links', 'ml', array('fetch' => PDO::FETCH_ASSOC))
+    ->fields('ml')
+    ->condition('ml.menu_name', $menu_name)
+    // Order by weight so as to be helpful for menus that are only one level
+    // deep.
+    ->orderBy('weight')
+    ->execute()
+    ->fetchAll();
+
+  foreach ($links as &$link) {
+    $link['options'] = unserialize($link['options']);
+  }
+  return $links;
+}
+
+/**
+ * Deletes all links for a menu.
+ *
+ * @param $menu_name
+ *   The name of the menu whose links will be deleted.
+ */
+function menu_delete_links($menu_name) {
+  $links = menu_load_links($menu_name);
+  foreach ($links as $link) {
+    // To speed up the deletion process, we reset some link properties that
+    // would trigger re-parenting logic in _menu_delete_item() and
+    // _menu_update_parental_status().
+    $link['has_children'] = FALSE;
+    $link['plid'] = 0;
+    _menu_delete_item($link);
+  }
+}
+
+/**
+ * Delete one or several menu links.
+ *
+ * @param $mlid
+ *   A valid menu link mlid or NULL. If NULL, $path is used.
+ * @param $path
+ *   The path to the menu items to be deleted. $mlid must be NULL.
+ */
+function menu_link_delete($mlid, $path = NULL) {
+  if (isset($mlid)) {
+    _menu_delete_item(db_query("SELECT * FROM {menu_links} WHERE mlid = :mlid", array(':mlid' => $mlid))->fetchAssoc());
+  }
+  else {
+    $result = db_query("SELECT * FROM {menu_links} WHERE link_path = :link_path", array(':link_path' => $path));
+    foreach ($result as $link) {
+      _menu_delete_item($link);
+    }
+  }
+}
+
+/**
+ * Deletes a single menu link.
+ *
+ * @param $item
+ *   Item to be deleted.
+ * @param $force
+ *   Forces deletion. Internal use only, setting to TRUE is discouraged.
+ *
+ * @see menu_link_delete()
+ */
+function _menu_delete_item($item, $force = FALSE) {
+  $item = is_object($item) ? get_object_vars($item) : $item;
+  if ($item && ($item['module'] != 'system' || $item['updated'] || $force)) {
+    // Children get re-attached to the item's parent.
+    if ($item['has_children']) {
+      $result = db_query("SELECT mlid FROM {menu_links} WHERE plid = :plid", array(':plid' => $item['mlid']));
+      foreach ($result as $m) {
+        $child = menu_link_load($m->mlid);
+        $child['plid'] = $item['plid'];
+        menu_link_save($child);
+      }
+    }
+
+    // Notify modules we are deleting the item.
+    module_invoke_all('menu_link_delete', $item);
+
+    db_delete('menu_links')->condition('mlid', $item['mlid'])->execute();
+
+    // Update the has_children status of the parent.
+    _menu_update_parental_status($item);
+    menu_cache_clear($item['menu_name']);
+    _menu_clear_page_cache();
+  }
+}
+
+/**
+ * Saves a menu link.
+ *
+ * After calling this function, rebuild the menu cache using
+ * menu_cache_clear_all().
+ *
+ * @param $item
+ *   An associative array representing a menu link item, with elements:
+ *   - link_path: (required) The path of the menu item, which should be
+ *     normalized first by calling drupal_get_normal_path() on it.
+ *   - link_title: (required) Title to appear in menu for the link.
+ *   - menu_name: (optional) The machine name of the menu for the link.
+ *     Defaults to 'navigation'.
+ *   - weight: (optional) Integer to determine position in menu. Default is 0.
+ *   - expanded: (optional) Boolean that determines if the item is expanded.
+ *   - options: (optional) An array of options, see l() for more.
+ *   - mlid: (optional) Menu link identifier, the primary integer key for each
+ *     menu link. Can be set to an existing value, or to 0 or NULL
+ *     to insert a new link.
+ *   - plid: (optional) The mlid of the parent.
+ *   - router_path: (optional) The path of the relevant router item.
+ * @param $existing_item
+ *   Optional, the current record from the {menu_links} table as an array.
+ * @param $parent_candidates
+ *   Optional array of menu links keyed by mlid. Used by
+ *   _menu_navigation_links_rebuild() only.
+ *
+ * @return
+ *   The mlid of the saved menu link, or FALSE if the menu link could not be
+ *   saved.
+ */
+function menu_link_save(&$item, $existing_item = array(), $parent_candidates = array()) {
+  drupal_alter('menu_link', $item);
+
+  // This is the easiest way to handle the unique internal path '<front>',
+  // since a path marked as external does not need to match a router path.
+  $item['external'] = (url_is_external($item['link_path'])  || $item['link_path'] == '<front>') ? 1 : 0;
+  // Load defaults.
+  $item += array(
+    'menu_name' => 'navigation',
+    'weight' => 0,
+    'link_title' => '',
+    'hidden' => 0,
+    'has_children' => 0,
+    'expanded' => 0,
+    'options' => array(),
+    'module' => 'menu',
+    'customized' => 0,
+    'updated' => 0,
+  );
+  if (isset($item['mlid'])) {
+    if (!$existing_item) {
+      $existing_item = db_query('SELECT * FROM {menu_links} WHERE mlid = :mlid', array('mlid' => $item['mlid']))->fetchAssoc();
+    }
+    if ($existing_item) {
+      $existing_item['options'] = unserialize($existing_item['options']);
+    }
+  }
+  else {
+    $existing_item = FALSE;
+  }
+
+  // Try to find a parent link. If found, assign it and derive its menu.
+  $parent = _menu_link_find_parent($item, $parent_candidates);
+  if (!empty($parent['mlid'])) {
+    $item['plid'] = $parent['mlid'];
+    $item['menu_name'] = $parent['menu_name'];
+  }
+  // If no corresponding parent link was found, move the link to the top-level.
+  else {
+    $item['plid'] = 0;
+  }
+  $menu_name = $item['menu_name'];
+
+  if (!$existing_item) {
+    $item['mlid'] = db_insert('menu_links')
+      ->fields(array(
+        'menu_name' => $item['menu_name'],
+        'plid' => $item['plid'],
+        'link_path' => $item['link_path'],
+        'hidden' => $item['hidden'],
+        'external' => $item['external'],
+        'has_children' => $item['has_children'],
+        'expanded' => $item['expanded'],
+        'weight' => $item['weight'],
+        'module' => $item['module'],
+        'link_title' => $item['link_title'],
+        'options' => serialize($item['options']),
+        'customized' => $item['customized'],
+        'updated' => $item['updated'],
+      ))
+      ->execute();
+  }
+
+  // Directly fill parents for top-level links.
+  if ($item['plid'] == 0) {
+    $item['p1'] = $item['mlid'];
+    for ($i = 2; $i <= MENU_MAX_DEPTH; $i++) {
+      $item["p$i"] = 0;
+    }
+    $item['depth'] = 1;
+  }
+  // Otherwise, ensure that this link's depth is not beyond the maximum depth
+  // and fill parents based on the parent link.
+  else {
+    if ($item['has_children'] && $existing_item) {
+      $limit = MENU_MAX_DEPTH - menu_link_children_relative_depth($existing_item) - 1;
+    }
+    else {
+      $limit = MENU_MAX_DEPTH - 1;
+    }
+    if ($parent['depth'] > $limit) {
+      return FALSE;
+    }
+    $item['depth'] = $parent['depth'] + 1;
+    _menu_link_parents_set($item, $parent);
+  }
+  // Need to check both plid and menu_name, since plid can be 0 in any menu.
+  if ($existing_item && ($item['plid'] != $existing_item['plid'] || $menu_name != $existing_item['menu_name'])) {
+    _menu_link_move_children($item, $existing_item);
+  }
+  // Find the router_path.
+  if (empty($item['router_path'])  || !$existing_item || ($existing_item['link_path'] != $item['link_path'])) {
+    if ($item['external']) {
+      $item['router_path'] = '';
+    }
+    else {
+      // Find the router path which will serve this path.
+      $item['parts'] = explode('/', $item['link_path'], MENU_MAX_PARTS);
+      $item['router_path'] = _menu_find_router_path($item['link_path']);
+    }
+  }
+  // If every value in $existing_item is the same in the $item, there is no
+  // reason to run the update queries or clear the caches. We use
+  // array_intersect_key() with the $item as the first parameter because
+  // $item may have additional keys left over from building a router entry.
+  // The intersect removes the extra keys, allowing a meaningful comparison.
+  if (!$existing_item || (array_intersect_key($item, $existing_item) != $existing_item)) {
+    db_update('menu_links')
+      ->fields(array(
+        'menu_name' => $item['menu_name'],
+        'plid' => $item['plid'],
+        'link_path' => $item['link_path'],
+        'router_path' => $item['router_path'],
+        'hidden' => $item['hidden'],
+        'external' => $item['external'],
+        'has_children' => $item['has_children'],
+        'expanded' => $item['expanded'],
+        'weight' => $item['weight'],
+        'depth' => $item['depth'],
+        'p1' => $item['p1'],
+        'p2' => $item['p2'],
+        'p3' => $item['p3'],
+        'p4' => $item['p4'],
+        'p5' => $item['p5'],
+        'p6' => $item['p6'],
+        'p7' => $item['p7'],
+        'p8' => $item['p8'],
+        'p9' => $item['p9'],
+        'module' => $item['module'],
+        'link_title' => $item['link_title'],
+        'options' => serialize($item['options']),
+        'customized' => $item['customized'],
+      ))
+      ->condition('mlid', $item['mlid'])
+      ->execute();
+    // Check the has_children status of the parent.
+    _menu_update_parental_status($item);
+    menu_cache_clear($menu_name);
+    if ($existing_item && $menu_name != $existing_item['menu_name']) {
+      menu_cache_clear($existing_item['menu_name']);
+    }
+    // Notify modules we have acted on a menu item.
+    $hook = 'menu_link_insert';
+    if ($existing_item) {
+      $hook = 'menu_link_update';
+    }
+    module_invoke_all($hook, $item);
+    // Now clear the cache.
+    _menu_clear_page_cache();
+  }
+  return $item['mlid'];
+}
+
+/**
+ * Finds a possible parent for a given menu link.
+ *
+ * Because the parent of a given link might not exist anymore in the database,
+ * we apply a set of heuristics to determine a proper parent:
+ *
+ *  - use the passed parent link if specified and existing.
+ *  - else, use the first existing link down the previous link hierarchy
+ *  - else, for system menu links (derived from hook_menu()), reparent
+ *    based on the path hierarchy.
+ *
+ * @param $menu_link
+ *   A menu link.
+ * @param $parent_candidates
+ *   An array of menu links keyed by mlid.
+ *
+ * @return
+ *   A menu link structure of the possible parent or FALSE if no valid parent
+ *   has been found.
+ */
+function _menu_link_find_parent($menu_link, $parent_candidates = array()) {
+  $parent = FALSE;
+
+  // This item is explicitely top-level, skip the rest of the parenting.
+  if (isset($menu_link['plid']) && empty($menu_link['plid'])) {
+    return $parent;
+  }
+
+  // If we have a parent link ID, try to use that.
+  $candidates = array();
+  if (isset($menu_link['plid'])) {
+    $candidates[] = $menu_link['plid'];
+  }
+
+  // Else, if we have a link hierarchy try to find a valid parent in there.
+  if (!empty($menu_link['depth']) && $menu_link['depth'] > 1) {
+    for ($depth = $menu_link['depth'] - 1; $depth >= 1; $depth--) {
+      $candidates[] = $menu_link['p' . $depth];
+    }
+  }
+
+  foreach ($candidates as $mlid) {
+    if (isset($parent_candidates[$mlid])) {
+      $parent = $parent_candidates[$mlid];
+    }
+    else {
+      $parent = db_query("SELECT * FROM {menu_links} WHERE mlid = :mlid", array(':mlid' => $mlid))->fetchAssoc();
+    }
+    if ($parent) {
+      return $parent;
+    }
+  }
+
+  // If everything else failed, try to derive the parent from the path
+  // hierarchy. This only makes sense for links derived from menu router
+  // items (ie. from hook_menu()).
+  if ($menu_link['module'] == 'system') {
+    $query = db_select('menu_links');
+    $query->condition('module', 'system');
+    // We always respect the link's 'menu_name'; inheritance for router items is
+    // ensured in _menu_router_build().
+    $query->condition('menu_name', $menu_link['menu_name']);
+
+    // Find the parent - it must be unique.
+    $parent_path = $menu_link['link_path'];
+    do {
+      $parent = FALSE;
+      $parent_path = substr($parent_path, 0, strrpos($parent_path, '/'));
+      $new_query = clone $query;
+      $new_query->condition('link_path', $parent_path);
+      // Only valid if we get a unique result.
+      if ($new_query->countQuery()->execute()->fetchField() == 1) {
+        $parent = $new_query->fields('menu_links')->execute()->fetchAssoc();
+      }
+    } while ($parent === FALSE && $parent_path);
+  }
+
+  return $parent;
+}
+
+/**
+ * Clears the page and block caches at most twice per page load.
+ */
+function _menu_clear_page_cache() {
+  $cache_cleared = &drupal_static(__FUNCTION__, 0);
+
+  // Clear the page and block caches, but at most twice, including at
+  //  the end of the page load when there are multiple links saved or deleted.
+  if ($cache_cleared == 0) {
+    cache_clear_all();
+    // Keep track of which menus have expanded items.
+    _menu_set_expanded_menus();
+    $cache_cleared = 1;
+  }
+  elseif ($cache_cleared == 1) {
+    drupal_register_shutdown_function('cache_clear_all');
+    // Keep track of which menus have expanded items.
+    drupal_register_shutdown_function('_menu_set_expanded_menus');
+    $cache_cleared = 2;
+  }
+}
+
+/**
+ * Updates a list of menus with expanded items.
+ */
+function _menu_set_expanded_menus() {
+  $names = db_query("SELECT menu_name FROM {menu_links} WHERE expanded <> 0 GROUP BY menu_name")->fetchCol();
+  variable_set('menu_expanded', $names);
+}
+
+/**
+ * Finds the router path which will serve this path.
+ *
+ * @param $link_path
+ *  The path for we are looking up its router path.
+ *
+ * @return
+ *  A path from $menu keys or empty if $link_path points to a nonexisting
+ *  place.
+ */
+function _menu_find_router_path($link_path) {
+  // $menu will only have data during a menu rebuild.
+  $menu = _menu_router_cache();
+
+  $router_path = $link_path;
+  $parts = explode('/', $link_path, MENU_MAX_PARTS);
+  $ancestors = menu_get_ancestors($parts);
+
+  if (empty($menu)) {
+    // Not during a menu rebuild, so look up in the database.
+    $router_path = (string) db_select('menu_router')
+      ->fields('menu_router', array('path'))
+      ->condition('path', $ancestors, 'IN')
+      ->orderBy('fit', 'DESC')
+      ->range(0, 1)
+      ->execute()->fetchField();
+  }
+  elseif (!isset($menu[$router_path])) {
+    // Add an empty router path as a fallback.
+    $ancestors[] = '';
+    foreach ($ancestors as $key => $router_path) {
+      if (isset($menu[$router_path])) {
+        // Exit the loop leaving $router_path as the first match.
+        break;
+      }
+    }
+    // If we did not find the path, $router_path will be the empty string
+    // at the end of $ancestors.
+  }
+  return $router_path;
+}
+
+/**
+ * Inserts, updates, or deletes an uncustomized menu link related to a module.
+ *
+ * @param $module
+ *   The name of the module.
+ * @param $op
+ *   Operation to perform: insert, update or delete.
+ * @param $link_path
+ *   The path this link points to.
+ * @param $link_title
+ *   Title of the link to insert or new title to update the link to.
+ *   Unused for delete.
+ *
+ * @return
+ *   The insert op returns the mlid of the new item. Others op return NULL.
+ */
+function menu_link_maintain($module, $op, $link_path, $link_title) {
+  switch ($op) {
+    case 'insert':
+      $menu_link = array(
+        'link_title' => $link_title,
+        'link_path' => $link_path,
+        'module' => $module,
+      );
+      return menu_link_save($menu_link);
+      break;
+    case 'update':
+      $result = db_query("SELECT * FROM {menu_links} WHERE link_path = :link_path AND module = :module AND customized = 0", array(':link_path' => $link_path, ':module' => $module))->fetchAll(PDO::FETCH_ASSOC);
+      foreach ($result as $link) {
+        $link['link_title'] = $link_title;
+        $link['options'] = unserialize($link['options']);
+        menu_link_save($link);
+      }
+      break;
+    case 'delete':
+      menu_link_delete(NULL, $link_path);
+      break;
+  }
+}
+
+/**
+ * Finds the depth of an item's children relative to its depth.
+ *
+ * For example, if the item has a depth of 2, and the maximum of any child in
+ * the menu link tree is 5, the relative depth is 3.
+ *
+ * @param $item
+ *   An array representing a menu link item.
+ *
+ * @return
+ *   The relative depth, or zero.
+ *
+ */
+function menu_link_children_relative_depth($item) {
+  $query = db_select('menu_links');
+  $query->addField('menu_links', 'depth');
+  $query->condition('menu_name', $item['menu_name']);
+  $query->orderBy('depth', 'DESC');
+  $query->range(0, 1);
+
+  $i = 1;
+  $p = 'p1';
+  while ($i <= MENU_MAX_DEPTH && $item[$p]) {
+    $query->condition($p, $item[$p]);
+    $p = 'p' . ++$i;
+  }
+
+  $max_depth = $query->execute()->fetchField();
+
+  return ($max_depth > $item['depth']) ? $max_depth - $item['depth'] : 0;
+}
+
+/**
+ * Updates the children of a menu link that is being moved.
+ *
+ * The menu name, parents (p1 - p6), and depth are updated for all children of
+ * the link, and the has_children status of the previous parent is updated.
+ */
+function _menu_link_move_children($item, $existing_item) {
+  $query = db_update('menu_links');
+
+  $query->fields(array('menu_name' => $item['menu_name']));
+
+  $p = 'p1';
+  $expressions = array();
+  for ($i = 1; $i <= $item['depth']; $p = 'p' . ++$i) {
+    $expressions[] = array($p, ":p_$i", array(":p_$i" => $item[$p]));
+  }
+  $j = $existing_item['depth'] + 1;
+  while ($i <= MENU_MAX_DEPTH && $j <= MENU_MAX_DEPTH) {
+    $expressions[] = array('p' . $i++, 'p' . $j++, array());
+  }
+  while ($i <= MENU_MAX_DEPTH) {
+    $expressions[] = array('p' . $i++, 0, array());
+  }
+
+  $shift = $item['depth'] - $existing_item['depth'];
+  if ($shift > 0) {
+    // The order of expressions must be reversed so the new values don't
+    // overwrite the old ones before they can be used because "Single-table
+    // UPDATE assignments are generally evaluated from left to right"
+    // see: http://dev.mysql.com/doc/refman/5.0/en/update.html
+    $expressions = array_reverse($expressions);
+  }
+  foreach ($expressions as $expression) {
+    $query->expression($expression[0], $expression[1], $expression[2]);
+  }
+
+  $query->expression('depth', 'depth + :depth', array(':depth' => $shift));
+  $query->condition('menu_name', $existing_item['menu_name']);
+  $p = 'p1';
+  for ($i = 1; $i <= MENU_MAX_DEPTH && $existing_item[$p]; $p = 'p' . ++$i) {
+    $query->condition($p, $existing_item[$p]);
+  }
+
+  $query->execute();
+
+  // Check the has_children status of the parent, while excluding this item.
+  _menu_update_parental_status($existing_item, TRUE);
+}
+
+/**
+ * Checks and updates the 'has_children' status for the parent of a link.
+ */
+function _menu_update_parental_status($item, $exclude = FALSE) {
+  // If plid == 0, there is nothing to update.
+  if ($item['plid']) {
+    // Check if at least one visible child exists in the table.
+    $query = db_select('menu_links');
+    $query->addField('menu_links', 'mlid');
+    $query->condition('menu_name', $item['menu_name']);
+    $query->condition('hidden', 0);
+    $query->condition('plid', $item['plid']);
+    $query->range(0, 1);
+    if ($exclude) {
+      $query->condition('mlid', $item['mlid'], '<>');
+    }
+    $parent_has_children = ((bool) $query->execute()->fetchField()) ? 1 : 0;
+    db_update('menu_links')
+      ->fields(array('has_children' => $parent_has_children))
+      ->condition('mlid', $item['plid'])
+      ->execute();
+  }
+}
+
+/**
+ * Sets the p1 through p9 values for a menu link being saved.
+ */
+function _menu_link_parents_set(&$item, $parent) {
+  $i = 1;
+  while ($i < $item['depth']) {
+    $p = 'p' . $i++;
+    $item[$p] = $parent[$p];
+  }
+  $p = 'p' . $i++;
+  // The parent (p1 - p9) corresponding to the depth always equals the mlid.
+  $item[$p] = $item['mlid'];
+  while ($i <= MENU_MAX_DEPTH) {
+    $p = 'p' . $i++;
+    $item[$p] = 0;
+  }
+}
+
+/**
+ * Builds the router table based on the data from hook_menu().
+ */
+function _menu_router_build($callbacks) {
+  // First pass: separate callbacks from paths, making paths ready for
+  // matching. Calculate fitness, and fill some default values.
+  $menu = array();
+  $masks = array();
+  foreach ($callbacks as $path => $item) {
+    $load_functions = array();
+    $to_arg_functions = array();
+    $fit = 0;
+    $move = FALSE;
+
+    $parts = explode('/', $path, MENU_MAX_PARTS);
+    $number_parts = count($parts);
+    // We store the highest index of parts here to save some work in the fit
+    // calculation loop.
+    $slashes = $number_parts - 1;
+    // Extract load and to_arg functions.
+    foreach ($parts as $k => $part) {
+      $match = FALSE;
+      // Look for wildcards in the form allowed to be used in PHP functions,
+      // because we are using these to construct the load function names.
+      if (preg_match('/^%(|' . DRUPAL_PHP_FUNCTION_PATTERN . ')$/', $part, $matches)) {
+        if (empty($matches[1])) {
+          $match = TRUE;
+          $load_functions[$k] = NULL;
+        }
+        else {
+          if (function_exists($matches[1] . '_to_arg')) {
+            $to_arg_functions[$k] = $matches[1] . '_to_arg';
+            $load_functions[$k] = NULL;
+            $match = TRUE;
+          }
+          if (function_exists($matches[1] . '_load')) {
+            $function = $matches[1] . '_load';
+            // Create an array of arguments that will be passed to the _load
+            // function when this menu path is checked, if 'load arguments'
+            // exists.
+            $load_functions[$k] = isset($item['load arguments']) ? array($function => $item['load arguments']) : $function;
+            $match = TRUE;
+          }
+        }
+      }
+      if ($match) {
+        $parts[$k] = '%';
+      }
+      else {
+        $fit |=  1 << ($slashes - $k);
+      }
+    }
+    if ($fit) {
+      $move = TRUE;
+    }
+    else {
+      // If there is no %, it fits maximally.
+      $fit = (1 << $number_parts) - 1;
+    }
+    $masks[$fit] = 1;
+    $item['_load_functions'] = $load_functions;
+    $item['to_arg_functions'] = empty($to_arg_functions) ? '' : serialize($to_arg_functions);
+    $item += array(
+      'title' => '',
+      'weight' => 0,
+      'type' => MENU_NORMAL_ITEM,
+      'module' => '',
+      '_number_parts' => $number_parts,
+      '_parts' => $parts,
+      '_fit' => $fit,
+    );
+    $item += array(
+      '_visible' => (bool) ($item['type'] & MENU_VISIBLE_IN_BREADCRUMB),
+      '_tab' => (bool) ($item['type'] & MENU_IS_LOCAL_TASK),
+    );
+    if ($move) {
+      $new_path = implode('/', $item['_parts']);
+      $menu[$new_path] = $item;
+      $sort[$new_path] = $number_parts;
+    }
+    else {
+      $menu[$path] = $item;
+      $sort[$path] = $number_parts;
+    }
+  }
+  array_multisort($sort, SORT_NUMERIC, $menu);
+  // Apply inheritance rules.
+  foreach ($menu as $path => $v) {
+    $item = &$menu[$path];
+    if (!$item['_tab']) {
+      // Non-tab items.
+      $item['tab_parent'] = '';
+      $item['tab_root'] = $path;
+    }
+    // If not specified, assign the default tab type for local tasks.
+    elseif (!isset($item['context'])) {
+      $item['context'] = MENU_CONTEXT_PAGE;
+    }
+    for ($i = $item['_number_parts'] - 1; $i; $i--) {
+      $parent_path = implode('/', array_slice($item['_parts'], 0, $i));
+      if (isset($menu[$parent_path])) {
+
+        $parent = &$menu[$parent_path];
+
+        // If we have no menu name, try to inherit it from parent items.
+        if (!isset($item['menu_name'])) {
+          // If the parent item of this item does not define a menu name (and no
+          // previous iteration assigned one already), try to find the menu name
+          // of the parent item in the currently stored menu links.
+          if (!isset($parent['menu_name'])) {
+            $menu_name = db_query("SELECT menu_name FROM {menu_links} WHERE router_path = :router_path AND module = 'system'", array(':router_path' => $parent_path))->fetchField();
+            if ($menu_name) {
+              $parent['menu_name'] = $menu_name;
+            }
+          }
+          // If the parent item defines a menu name, inherit it.
+          if (!empty($parent['menu_name'])) {
+            $item['menu_name'] = $parent['menu_name'];
+          }
+        }
+        if (!isset($item['tab_parent'])) {
+          // Parent stores the parent of the path.
+          $item['tab_parent'] = $parent_path;
+        }
+        if (!isset($item['tab_root']) && !$parent['_tab']) {
+          $item['tab_root'] = $parent_path;
+        }
+        // If an access callback is not found for a default local task we use
+        // the callback from the parent, since we expect them to be identical.
+        // In all other cases, the access parameters must be specified.
+        if (($item['type'] == MENU_DEFAULT_LOCAL_TASK) && !isset($item['access callback']) && isset($parent['access callback'])) {
+          $item['access callback'] = $parent['access callback'];
+          if (!isset($item['access arguments']) && isset($parent['access arguments'])) {
+            $item['access arguments'] = $parent['access arguments'];
+          }
+        }
+        // Same for page callbacks.
+        if (!isset($item['page callback']) && isset($parent['page callback'])) {
+          $item['page callback'] = $parent['page callback'];
+          if (!isset($item['page arguments']) && isset($parent['page arguments'])) {
+            $item['page arguments'] = $parent['page arguments'];
+          }
+          if (!isset($item['file path']) && isset($parent['file path'])) {
+            $item['file path'] = $parent['file path'];
+          }
+          if (!isset($item['file']) && isset($parent['file'])) {
+            $item['file'] = $parent['file'];
+            if (empty($item['file path']) && isset($item['module']) && isset($parent['module']) && $item['module'] != $parent['module']) {
+              $item['file path'] = drupal_get_path('module', $parent['module']);
+            }
+          }
+        }
+        // Same for delivery callbacks.
+        if (!isset($item['delivery callback']) && isset($parent['delivery callback'])) {
+          $item['delivery callback'] = $parent['delivery callback'];
+        }
+        // Same for theme callbacks.
+        if (!isset($item['theme callback']) && isset($parent['theme callback'])) {
+          $item['theme callback'] = $parent['theme callback'];
+          if (!isset($item['theme arguments']) && isset($parent['theme arguments'])) {
+            $item['theme arguments'] = $parent['theme arguments'];
+          }
+        }
+        // Same for load arguments: if a loader doesn't have any explict
+        // arguments, try to find arguments in the parent.
+        if (!isset($item['load arguments'])) {
+          foreach ($item['_load_functions'] as $k => $function) {
+            // This loader doesn't have any explict arguments...
+            if (!is_array($function)) {
+              // ... check the parent for a loader at the same position
+              // using the same function name and defining arguments...
+              if (isset($parent['_load_functions'][$k]) && is_array($parent['_load_functions'][$k]) && key($parent['_load_functions'][$k]) === $function) {
+                // ... and inherit the arguments on the child.
+                $item['_load_functions'][$k] = $parent['_load_functions'][$k];
+              }
+            }
+          }
+        }
+      }
+    }
+    if (!isset($item['access callback']) && isset($item['access arguments'])) {
+      // Default callback.
+      $item['access callback'] = 'user_access';
+    }
+    if (!isset($item['access callback']) || empty($item['page callback'])) {
+      $item['access callback'] = 0;
+    }
+    if (is_bool($item['access callback'])) {
+      $item['access callback'] = intval($item['access callback']);
+    }
+
+    $item['load_functions'] = empty($item['_load_functions']) ? '' : serialize($item['_load_functions']);
+    $item += array(
+      'access arguments' => array(),
+      'access callback' => '',
+      'page arguments' => array(),
+      'page callback' => '',
+      'delivery callback' => '',
+      'title arguments' => array(),
+      'title callback' => 't',
+      'theme arguments' => array(),
+      'theme callback' => '',
+      'description' => '',
+      'position' => '',
+      'context' => 0,
+      'tab_parent' => '',
+      'tab_root' => $path,
+      'path' => $path,
+      'file' => '',
+      'file path' => '',
+      'include file' => '',
+    );
+
+    // Calculate out the file to be included for each callback, if any.
+    if ($item['file']) {
+      $file_path = $item['file path'] ? $item['file path'] : drupal_get_path('module', $item['module']);
+      $item['include file'] = $file_path . '/' . $item['file'];
+    }
+  }
+
+  // Sort the masks so they are in order of descending fit.
+  $masks = array_keys($masks);
+  rsort($masks);
+
+  return array($menu, $masks);
+}
+
+/**
+ * Saves data from menu_router_build() to the router table.
+ */
+function _menu_router_save($menu, $masks) {
+  // Delete the existing router since we have some data to replace it.
+  db_truncate('menu_router')->execute();
+
+  // Prepare insert object.
+  $insert = db_insert('menu_router')
+    ->fields(array(
+      'path',
+      'load_functions',
+      'to_arg_functions',
+      'access_callback',
+      'access_arguments',
+      'page_callback',
+      'page_arguments',
+      'delivery_callback',
+      'fit',
+      'number_parts',
+      'context',
+      'tab_parent',
+      'tab_root',
+      'title',
+      'title_callback',
+      'title_arguments',
+      'theme_callback',
+      'theme_arguments',
+      'type',
+      'description',
+      'position',
+      'weight',
+      'include_file',
+    ));
+
+  $num_records = 0;
+
+  foreach ($menu as $path => $item) {
+    // Fill in insert object values.
+    $insert->values(array(
+      'path' => $item['path'],
+      'load_functions' => $item['load_functions'],
+      'to_arg_functions' => $item['to_arg_functions'],
+      'access_callback' => $item['access callback'],
+      'access_arguments' => serialize($item['access arguments']),
+      'page_callback' => $item['page callback'],
+      'page_arguments' => serialize($item['page arguments']),
+      'delivery_callback' => $item['delivery callback'],
+      'fit' => $item['_fit'],
+      'number_parts' => $item['_number_parts'],
+      'context' => $item['context'],
+      'tab_parent' => $item['tab_parent'],
+      'tab_root' => $item['tab_root'],
+      'title' => $item['title'],
+      'title_callback' => $item['title callback'],
+      'title_arguments' => ($item['title arguments'] ? serialize($item['title arguments']) : ''),
+      'theme_callback' => $item['theme callback'],
+      'theme_arguments' => serialize($item['theme arguments']),
+      'type' => $item['type'],
+      'description' => $item['description'],
+      'position' => $item['position'],
+      'weight' => $item['weight'],
+      'include_file' => $item['include file'],
+    ));
+
+    // Execute in batches to avoid the memory overhead of all of those records
+    // in the query object.
+    if (++$num_records == 20) {
+      $insert->execute();
+      $num_records = 0;
+    }
+  }
+  // Insert any remaining records.
+  $insert->execute();
+  // Store the masks.
+  variable_set('menu_masks', $masks);
+
+  return $menu;
+}
+
+/**
+ * Checks whether the site is in maintenance mode.
+ *
+ * This function will log the current user out and redirect to front page
+ * if the current user has no 'access site in maintenance mode' permission.
+ *
+ * @param $check_only
+ *   If this is set to TRUE, the function will perform the access checks and
+ *   return the site offline status, but not log the user out or display any
+ *   messages.
+ *
+ * @return
+ *   FALSE if the site is not in maintenance mode, the user login page is
+ *   displayed, or the user has the 'access site in maintenance mode'
+ *   permission. TRUE for anonymous users not being on the login page when the
+ *   site is in maintenance mode.
+ */
+function _menu_site_is_offline($check_only = FALSE) {
+  // Check if site is in maintenance mode.
+  if (variable_get('maintenance_mode', 0)) {
+    if (user_access('access site in maintenance mode')) {
+      // Ensure that the maintenance mode message is displayed only once
+      // (allowing for page redirects) and specifically suppress its display on
+      // the maintenance mode settings page.
+      if (!$check_only && $_GET['q'] != 'admin/config/development/maintenance') {
+        if (user_access('administer site configuration')) {
+          drupal_set_message(t('Operating in maintenance mode. <a href="@url">Go online.</a>', array('@url' => url('admin/config/development/maintenance'))), 'status', FALSE);
+        }
+        else {
+          drupal_set_message(t('Operating in maintenance mode.'), 'status', FALSE);
+        }
+      }
+    }
+    else {
+      return TRUE;
+    }
+  }
+  return FALSE;
+}
+
+/**
+ * @} End of "defgroup menu".
+ */