default.php

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<?php
use Elgg\Menu\MenuSection;
use Elgg\Menu\PreparedMenu;

$menu = elgg_extract('menu', $vars);
if (!$menu instanceof PreparedMenu) {
    return;
}

// we want css classes to use dashes
$name = elgg_extract('name', $vars, '');

$name_class_selector = preg_replace('/[^a-z0-9\-]/i', '-', elgg_strtolower($name));
        
$show_section_headers = elgg_extract('show_section_headers', $vars, false);
$item_class = elgg_extract_class($vars, [], 'item_class');

$class = elgg_extract_class($vars, ["elgg-menu", "elgg-menu-{$name_class_selector}"]);

$menu_view = '';

foreach ($menu as $section) {
    if (!$section instanceof MenuSection) {
        continue;
    }

    $section_class = $class;
    $section_class_selector = preg_replace('/[^a-z0-9\-]/i', '-', elgg_strtolower($section->getID()));
    $section_class[] = "elgg-menu-{$name_class_selector}-{$section_class_selector}";
    
    $menu_view .= elgg_view('navigation/menu/elements/section', [
        'items' => $section->all(),
        'class' => $section_class,
        'section' => $section->getID(),
        'name' => $name,
        'show_section_headers' => $show_section_headers,
        'item_class' => $item_class,
        'id' => elgg_extract('id', $vars),
    ]);
}

if (!$menu_view) {
    return;
}

echo elgg_format_element('nav', [
    'class' => [
        'elgg-menu-container',
        "elgg-menu-{$name_class_selector}-container",
    ],
    'data-menu-name' => $name,
], $menu_view);