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<?php
/**
* @package Polylang
*/
/**
* Manages custom menus translations as well as the language switcher menu item on frontend
*
* @since 1.2
*/
class PLL_Frontend_Nav_Menu extends PLL_Nav_Menu {
/**
* Current language.
*
* @var PLL_Language|null|false
*/
public $curlang;
/**
* Constructor
*
* @since 1.2
*
* @param object $polylang The Polylang object.
*/
public function __construct( &$polylang ) {
parent::__construct( $polylang );
$this->curlang = &$polylang->curlang;
// Split the language switcher menu item in several language menu items
add_filter( 'wp_get_nav_menu_items', array( $this, 'wp_get_nav_menu_items' ), 20 ); // after the customizer menus
add_filter( 'wp_nav_menu_objects', array( $this, 'wp_nav_menu_objects' ) );
add_filter( 'nav_menu_link_attributes', array( $this, 'nav_menu_link_attributes' ), 10, 2 );
// Filters menus by language
add_filter( 'theme_mod_nav_menu_locations', array( $this, 'nav_menu_locations' ), 20 );
add_filter( 'wp_nav_menu_args', array( $this, 'wp_nav_menu_args' ) );
// The customizer
if ( isset( $_POST['wp_customize'], $_POST['customized'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
add_filter( 'wp_nav_menu_args', array( $this, 'filter_args_before_customizer' ) );
add_filter( 'wp_nav_menu_args', array( $this, 'filter_args_after_customizer' ), 2000 );
}
}
/**
* Sorts menu items by menu order.
*
* @since 1.7.9
*
* @param stdClass $a The first object to compare.
* @param stdClass $b The second object to compare.
* @return int -1 or 1 if $a is considered to be respectively less than or greater than $b.
*/
protected function usort_menu_items( $a, $b ) {
return ( $a->menu_order < $b->menu_order ) ? -1 : 1;
}
/**
* Format a language switcher menu item title based on options
*
* @since 2.2.6
*
* @param string $flag Formatted flag
* @param string $name Language name
* @param array $options Language switcher options
* @return string Formatted menu item title
*/
protected function get_item_title( $flag, $name, $options ) {
if ( $options['show_flags'] ) {
if ( $options['show_names'] ) {
$title = sprintf( '%1$s<span style="margin-%2$s:0.3em;">%3$s</span>', $flag, is_rtl() ? 'right' : 'left', esc_html( $name ) );
} else {
$title = $flag;
}
} else {
$title = esc_html( $name );
}
return $title;
}
/**
* Splits the one language switcher menu item of backend in several menu items on frontend.
* Takes care to menu_order as it is used later in wp_nav_menu().
*
* @since 1.1.1
*
* @param stdClass[] $items Menu items.
* @return stdClass[] Modified menu items.
*/
public function wp_get_nav_menu_items( $items ) {
if ( empty( $this->curlang ) ) {
return $items;
}
if ( doing_action( 'customize_register' ) ) { // needed since WP 4.3, doing_action available since WP 3.9
return $items;
}
// The customizer menus does not sort the items and we need them to be sorted before splitting the language switcher
usort( $items, array( $this, 'usort_menu_items' ) );
$new_items = array();
$offset = 0;
foreach ( $items as $item ) {
if ( $options = get_post_meta( $item->ID, '_pll_menu_item', true ) ) {
/** This filter is documented in include/switcher.php */
$options = apply_filters( 'pll_the_languages_args', $options ); // Honor the filter here for 'show_flags', 'show_names' and 'dropdown'.
$switcher = new PLL_Switcher();
$args = array_merge( array( 'raw' => 1 ), $options );
/** @var array */
$the_languages = $switcher->the_languages( PLL()->links, $args );
// parent item for dropdown
if ( ! empty( $options['dropdown'] ) ) {
$name = isset( $options['display_names_as'] ) && 'slug' === $options['display_names_as'] ? $this->curlang->slug : $this->curlang->name;
$item->title = $this->get_item_title( $this->curlang->get_display_flag( empty( $options['show_names'] ) ? 'alt' : 'no-alt' ), $name, $options );
$item->attr_title = '';
$item->classes = array( 'pll-parent-menu-item' );
$item->menu_order += $offset;
$new_items[] = $item;
++$offset;
}
$i = 0; // for incrementation of menu order only in case of dropdown
foreach ( $the_languages as $lang ) {
++$i;
$lang_item = clone $item;
$lang_item->ID = $lang_item->ID . '-' . $lang['slug']; // A unique ID
$lang_item->title = $this->get_item_title( $lang['flag'], $lang['name'], $options );
$lang_item->attr_title = '';
$lang_item->url = $lang['url'];
$lang_item->lang = $lang['locale']; // Save this for use in nav_menu_link_attributes
$lang_item->classes = $lang['classes'];
if ( ! empty( $options['dropdown'] ) ) {
$lang_item->menu_order = $item->menu_order + $i;
$lang_item->menu_item_parent = $item->db_id;
$lang_item->db_id = 0; // to avoid recursion
} else {
$lang_item->menu_order += $offset;
}
$new_items[] = $lang_item;
++$offset;
}
--$offset;
} else {
$item->menu_order += $offset;
$new_items[] = $item;
}
}
return $new_items;
}
/**
* Returns the ancestors of a menu item.
*
* @since 1.1.1
*
* @param stdClass $item Menu item.
* @return int[] Ancestors ids.
*/
public function get_ancestors( $item ) {
$ids = array();
$ancestor_id = (int) $item->db_id;
while ( ( $ancestor_id = get_post_meta( $ancestor_id, '_menu_item_menu_item_parent', true ) ) && ! in_array( $ancestor_id, $ids ) ) {
$ids[] = $ancestor_id;
}
return $ids;
}
/**
* Removes current-menu and current-menu-ancestor classes to lang switcher when not on the home page.
*
* @since 1.1.1
*
* @param stdClass[] $items An array of menu items.
* @return stdClass[]
*/
public function wp_nav_menu_objects( $items ) {
$r_ids = $k_ids = array();
foreach ( $items as $item ) {
if ( ! empty( $item->classes ) && is_array( $item->classes ) ) {
if ( in_array( 'current-lang', $item->classes ) ) {
$item->current = false;
$item->classes = array_diff( $item->classes, array( 'current-menu-item' ) );
$r_ids = array_merge( $r_ids, $this->get_ancestors( $item ) ); // Remove the classes for these ancestors
} elseif ( in_array( 'current-menu-item', $item->classes ) ) {
$k_ids = array_merge( $k_ids, $this->get_ancestors( $item ) ); // Keep the classes for these ancestors
}
}
}
$r_ids = array_diff( $r_ids, $k_ids );
foreach ( $items as $item ) {
if ( ! empty( $item->db_id ) && in_array( $item->db_id, $r_ids ) ) {
$item->classes = array_diff( $item->classes, array( 'current-menu-ancestor', 'current-menu-parent', 'current_page_parent', 'current_page_ancestor' ) );
}
}
return $items;
}
/**
* Adds hreflang attribute for the language switcher menu items.
* available since WP 3.6.
*
* @since 1.1
*
* @param string[] $atts HTML attributes applied to the menu item's `<a>` element.
* @param stdClass $item Menu item.
* @return string[] Modified attributes.
*/
public function nav_menu_link_attributes( $atts, $item ) {
if ( isset( $item->lang ) ) {
$atts['lang'] = $atts['hreflang'] = esc_attr( $item->lang );
}
return $atts;
}
/**
* Fills the theme nav menus locations with the right menu in the right language
* Needs to wait for the language to be defined
*
* @since 1.2
*
* @param array|bool $menus list of nav menus locations, false if menu locations have not been filled yet
* @return array|bool modified list of nav menus locations
*/
public function nav_menu_locations( $menus ) {
if ( is_array( $menus ) && ! empty( $this->curlang ) ) {
// First get multilingual menu locations from DB
$theme = get_option( 'stylesheet' );
foreach ( array_keys( $menus ) as $loc ) {
$menus[ $loc ] = empty( $this->options['nav_menus'][ $theme ][ $loc ][ $this->curlang->slug ] ) ? 0 : $this->options['nav_menus'][ $theme ][ $loc ][ $this->curlang->slug ];
}
// Support for theme customizer
if ( is_customize_preview() ) {
global $wp_customize;
foreach ( $wp_customize->unsanitized_post_values() as $key => $value ) {
if ( false !== strpos( $key, 'nav_menu_locations[' ) ) {
$loc = substr( trim( $key, ']' ), 19 );
$infos = $this->explode_location( $loc );
if ( $infos['lang'] === $this->curlang->slug ) {
$menus[ $infos['location'] ] = (int) $value;
} elseif ( $this->curlang->is_default ) {
$menus[ $loc ] = (int) $value;
}
}
}
}
}
return $menus;
}
/**
* Attempts to translate the nav menu when it is hardcoded or when no location is defined in wp_nav_menu().
*
* @since 1.7.10
*
* @param array $args Array of `wp_nav_menu()` arguments.
* @return array
*/
public function wp_nav_menu_args( $args ) {
$theme = get_option( 'stylesheet' );
if ( empty( $this->curlang ) || empty( $this->options['nav_menus'][ $theme ] ) ) {
return $args;
}
// Get the nav menu based on the requested menu
$menu = wp_get_nav_menu_object( $args['menu'] );
// Attempt to find a translation of this menu
// This obviously does not work if the nav menu has no associated theme location
if ( $menu ) {
foreach ( $this->options['nav_menus'][ $theme ] as $menus ) {
if ( in_array( $menu->term_id, $menus ) && ! empty( $menus[ $this->curlang->slug ] ) ) {
$args['menu'] = $menus[ $this->curlang->slug ];
return $args;
}
}
}
// Get the first menu that has items and and is in the current language if we still can't find a menu
if ( ! $menu && ! $args['theme_location'] ) {
$menus = wp_get_nav_menus();
foreach ( $menus as $menu_maybe ) {
if ( wp_get_nav_menu_items( $menu_maybe->term_id, array( 'update_post_term_cache' => false ) ) ) {
foreach ( $this->options['nav_menus'][ $theme ] as $menus ) {
if ( in_array( $menu_maybe->term_id, $menus ) && ! empty( $menus[ $this->curlang->slug ] ) ) {
$args['menu'] = $menus[ $this->curlang->slug ];
return $args;
}
}
}
}
}
return $args;
}
/**
* Filters the nav menu location before the customizer so that it matches the temporary location in the customizer
*
* @since 1.8
*
* @param array $args wp_nav_menu $args
* @return array modified $args
*/
public function filter_args_before_customizer( $args ) {
if ( ! empty( $this->curlang ) ) {
$args['theme_location'] = $this->combine_location( $args['theme_location'], $this->curlang );
}
return $args;
}
/**
* Filters the nav menu location after the customizer to get back the true nav menu location for the theme
*
* @since 1.8
*
* @param array $args wp_nav_menu $args
* @return array modified $args
*/
public function filter_args_after_customizer( $args ) {
$infos = $this->explode_location( $args['theme_location'] );
$args['theme_location'] = $infos['location'];
return $args;
}
}