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<?php
/**
* Elgg Menu Builder
*
* @package Elgg.Core
* @subpackage Navigation
*
* @since 1.8.0
*/
class ElggMenuBuilder {
protected $menu = array();
protected $selected = null;
/**
* ElggMenuBuilder constructor
*
* @param string $name Identifier of the menu
*/
public function __construct($menu) {
$this->menu = $menu;
}
/**
* Get a prepared menu array
*
* @param mixed $sort_by
* @return array
*/
public function getMenu($sort_by) {
$this->selectFromContext();
$this->selected = $this->findSelected();
$this->setupSections();
$this->setupTrees();
$this->sort($sort_by);
return $this->menu;
}
/**
* Get the selected menu item
*
* @return ElggMenuItem
*/
public function getSelected() {
return $this->selected;
}
/**
* Select menu items for the current context
*
* @return void
*/
protected function selectFromContext() {
if (!isset($this->menu)) {
$this->menu = array();
return;
}
// get menu items for this context
$selected_menu = array();
foreach ($this->menu as $menu_item) {
if ($menu_item->inContext()) {
$selected_menu[] = $menu_item;
}
}
$this->menu = $selected_menu;
}
/**
* Group the menu items into sections
* @return void
*/
protected function setupSections() {
$sectioned_menu = array();
foreach ($this->menu as $menu_item) {
if (!isset($sectioned_menu[$menu_item->getSection()])) {
$sectioned_menu[$menu_item->getSection()] = array();
}
$sectioned_menu[$menu_item->getSection()][] = $menu_item;
}
$this->menu = $sectioned_menu;
}
/**
* Create trees for each menu section
*
* @internal The tree is doubly linked (parent and children links)
* @return void
*/
protected function setupTrees() {
$menu_tree = array();
foreach ($this->menu as $key => $section) {
$parents = array();
$children = array();
// divide base nodes from children
foreach ($section as $menu_item) {
$parent_name = $menu_item->getParentName();
if (!$parent_name) {
$parents[$menu_item->getName()] = $menu_item;
} else {
$children[] = $menu_item;
}
}
// attach children to parents
$iteration = 0;
$current_gen = $parents;
while (count($children) && $iteration < 5) {
foreach ($children as $index => $menu_item) {
$parent_name = $menu_item->getParentName();
if (array_key_exists($parent_name, $current_gen)) {
$next_gen[$menu_item->getName()] = $menu_item;
$current_gen[$parent_name]->addChild($menu_item);
$menu_item->setParent($current_gen[$parent_name]);
unset($children[$index]);
}
}
$current_gen = $next_gen;
$iteration += 1;
}
// convert keys to indexes for first level of tree
$parents = array_values($parents);
$menu_tree[$key] = $parents;
}
$this->menu = $menu_tree;
}
/**
* Find the menu item that is currently selected
*
* @return ElggMenuItem
*/
protected function findSelected() {
// do we have a selected menu item already
foreach ($this->menu as $menu_item) {
if ($menu_item->getSelected()) {
return $menu_item;
}
}
// scan looking for a selected item
foreach ($this->menu as $menu_item) {
if ($menu_item->getURL()) {
if (elgg_http_url_is_identical(full_url(), $menu_item->getURL())) {
$menu_item->setSelected(true);
return $menu_item;
}
}
}
return null;
}
/**
* Sort the menu sections and trees
*
* @param mixed $sort_by Sort type as string or php callback
* @return void
*/
protected function sort($sort_by) {
// sort sections
ksort($this->menu);
switch ($sort_by) {
case 'text':
$sort_callback = array('ElggMenuBuilder', 'compareByText');
break;
case 'name':
$sort_callback = array('ElggMenuBuilder', 'compareByName');
break;
case 'weight':
$sort_callback = array('ElggMenuBuilder', 'compareByWeight');
break;
case 'order':
// use registration order
return;
break;
default:
if (is_callable($sort_by)) {
$sort_callback = $sort_by;
} else {
return;
}
break;
}
// sort each section
foreach ($this->menu as $index => $section) {
usort($section, $sort_callback);
$this->menu[$index] = $section;
// depth first traversal of tree
foreach ($section as $root) {
$stack = array();
array_push($stack, $root);
while (!empty($stack)) {
$node = array_pop($stack);
$node->sortChildren($sort_callback);
$children = $node->getChildren();
if ($children) {
$stack = array_merge($stack, $children);
}
$p = count($stack);
}
}
}
}
/**
* Compare two menu items by their display text
*
* @param ElggMenuItem $a
* @param ElggMenuItem $b
* @return bool
*/
public static function compareByText($a, $b) {
$a = $a->getText();
$b = $b->getText();
return strnatcmp($a, $b);
}
/**
* Compare two menu items by their identifiers
*
* @param ElggMenuItem $a
* @param ElggMenuItem $b
* @return bool
*/
public static function compareByName($a, $b) {
$a = $a->getName();
$b = $b->getName();
return strcmp($a, $b);
}
/**
* Compare two menu items by their weight
*
* @param ElggMenuItem $a
* @param ElggMenuItem $b
* @return bool
*/
public static function compareByWeight($a, $b) {
$a = $a->getWeight();
$b = $b->getWeight();
return $a > $b;
}
}
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