564 lines
20 KiB
PHP
564 lines
20 KiB
PHP
<?php
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/**
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* WP Bootstrap Navwalker
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*
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* @package WP-Bootstrap-Navwalker
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*/
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// Exit if accessed directly.
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defined( 'ABSPATH' ) || exit;
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/*
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* Class Name: WP_Bootstrap_Navwalker
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* Plugin Name: WP Bootstrap Navwalker
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* Plugin URI: https://github.com/wp-bootstrap/wp-bootstrap-navwalker
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* Description: A custom WordPress nav walker class to implement the Bootstrap 4 navigation style in a custom theme using the WordPress built in menu manager.
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* Author: Edward McIntyre - @twittem, WP Bootstrap, William Patton - @pattonwebz
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* Version: 4.1.0
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* Author URI: https://github.com/wp-bootstrap
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* GitHub Plugin URI: https://github.com/wp-bootstrap/wp-bootstrap-navwalker
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* GitHub Branch: master
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* License: GPL-3.0+
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* License URI: http://www.gnu.org/licenses/gpl-3.0.txt
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*/
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/* Check if Class Exists. */
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if ( ! class_exists( 'Understrap_WP_Bootstrap_Navwalker' ) ) {
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/**
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* WP_Bootstrap_Navwalker class.
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*
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* @extends Walker_Nav_Menu
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*/
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class Understrap_WP_Bootstrap_Navwalker extends Walker_Nav_Menu {
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/**
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* Starts the list before the elements are added.
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*
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* @since WP 3.0.0
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*
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* @see Walker_Nav_Menu::start_lvl()
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*
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* @param string $output Used to append additional content (passed by reference).
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* @param int $depth Depth of menu item. Used for padding.
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* @param stdClass $args An object of wp_nav_menu() arguments.
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*/
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public function start_lvl( &$output, $depth = 0, $args = array() ) {
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if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
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$t = '';
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$n = '';
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} else {
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$t = "\t";
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$n = "\n";
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}
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$indent = str_repeat( $t, $depth );
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// Default class to add to the file.
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$classes = array( 'dropdown-menu' );
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/**
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* Filters the CSS class(es) applied to a menu list element.
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*
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* @since WP 4.8.0
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*
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* @param array $classes The CSS classes that are applied to the menu `<ul>` element.
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* @param stdClass $args An object of `wp_nav_menu()` arguments.
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* @param int $depth Depth of menu item. Used for padding.
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*/
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$class_names = join( ' ', apply_filters( 'nav_menu_submenu_css_class', $classes, $args, $depth ) );
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$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
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/**
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* The `.dropdown-menu` container needs to have a labelledby
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* attribute which points to it's trigger link.
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*
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* Form a string for the labelledby attribute from the the latest
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* link with an id that was added to the $output.
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*/
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$labelledby = '';
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// find all links with an id in the output.
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preg_match_all( '/(<a.*?id=\"|\')(.*?)\"|\'.*?>/im', $output, $matches );
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// with pointer at end of array check if we got an ID match.
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if ( end( $matches[2] ) ) {
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// build a string to use as aria-labelledby.
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$labelledby = 'aria-labelledby="' . end( $matches[2] ) . '"';
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}
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$output .= "{$n}{$indent}<ul$class_names $labelledby role=\"menu\">{$n}";
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}
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/**
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* Starts the element output.
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*
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* @since WP 3.0.0
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* @since WP 4.4.0 The {@see 'nav_menu_item_args'} filter was added.
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*
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* @see Walker_Nav_Menu::start_el()
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*
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* @param string $output Used to append additional content (passed by reference).
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* @param WP_Post $item Menu item data object.
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* @param int $depth Depth of menu item. Used for padding.
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* @param stdClass $args An object of wp_nav_menu() arguments.
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* @param int $id Current item ID.
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*/
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public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
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if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
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$t = '';
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$n = '';
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} else {
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$t = "\t";
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$n = "\n";
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}
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$indent = ( $depth ) ? str_repeat( $t, $depth ) : '';
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$classes = empty( $item->classes ) ? array() : (array) $item->classes;
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// Initialize some holder variables to store specially handled item
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// wrappers and icons.
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$linkmod_classes = array();
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$icon_classes = array();
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/**
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* Get an updated $classes array without linkmod or icon classes.
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*
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* NOTE: linkmod and icon class arrays are passed by reference and
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* are maybe modified before being used later in this function.
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*/
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$classes = self::seporate_linkmods_and_icons_from_classes( $classes, $linkmod_classes, $icon_classes, $depth );
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// Join any icon classes plucked from $classes into a string.
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$icon_class_string = join( ' ', $icon_classes );
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/**
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* Filters the arguments for a single nav menu item.
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*
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* WP 4.4.0
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*
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* @param stdClass $args An object of wp_nav_menu() arguments.
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* @param WP_Post $item Menu item data object.
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* @param int $depth Depth of menu item. Used for padding.
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*/
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$args = apply_filters( 'nav_menu_item_args', $args, $item, $depth );
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// Add .dropdown or .active classes where they are needed.
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if ( isset( $args->has_children ) && $args->has_children ) {
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$classes[] = 'dropdown';
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}
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if ( in_array( 'current-menu-item', $classes, true ) || in_array( 'current-menu-parent', $classes, true ) ) {
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$classes[] = 'active';
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}
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// Add some additional default classes to the item.
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$classes[] = 'menu-item-' . $item->ID;
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$classes[] = 'nav-item';
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// Allow filtering the classes.
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$classes = apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth );
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// Form a string of classes in format: class="class_names".
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$class_names = join( ' ', $classes );
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$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
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/**
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* Filters the ID applied to a menu item's list item element.
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*
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* @since WP 3.0.1
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* @since WP 4.1.0 The `$depth` parameter was added.
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*
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* @param string $menu_id The ID that is applied to the menu item's `<li>` element.
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* @param WP_Post $item The current menu item.
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* @param stdClass $args An object of wp_nav_menu() arguments.
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* @param int $depth Depth of menu item. Used for padding.
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*/
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$id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args, $depth );
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$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
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$output .= $indent . '<li itemscope="itemscope" itemtype="https://www.schema.org/SiteNavigationElement"' . $id . $class_names . '>';
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// initialize array for holding the $atts for the link item.
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$atts = array();
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// Set title from item to the $atts array - if title is empty then
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// default to item title.
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if ( empty( $item->attr_title ) ) {
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$atts['title'] = ! empty( $item->title ) ? strip_tags( $item->title ) : '';
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} else {
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$atts['title'] = $item->attr_title;
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}
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$atts['target'] = ! empty( $item->target ) ? $item->target : '';
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if ( '_blank' === $item->target && empty( $item->xfn ) ) { // Thanks to LukaszJaro, see https://github.com/understrap/understrap/issues/973
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$atts['rel'] = 'noopener noreferrer';
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} else {
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$atts['rel'] = $item->xfn;
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}
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// If item has_children add atts to <a>.
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if ( isset( $args->has_children ) && $args->has_children && 0 === $depth && 1 !== $args->depth ) {
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$atts['href'] = '#';
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$atts['data-toggle'] = 'dropdown';
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$atts['aria-haspopup'] = 'true';
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$atts['aria-expanded'] = 'false';
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$atts['class'] = 'dropdown-toggle nav-link';
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$atts['id'] = 'menu-item-dropdown-' . $item->ID;
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} else {
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$atts['href'] = ! empty( $item->url ) ? $item->url : '#';
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// Items in dropdowns use .dropdown-item instead of .nav-link.
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if ( $depth > 0 ) {
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$atts['class'] = 'dropdown-item';
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} else {
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$atts['class'] = 'nav-link';
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}
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}
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// update atts of this item based on any custom linkmod classes.
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$atts = self::update_atts_for_linkmod_type( $atts, $linkmod_classes );
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// Allow filtering of the $atts array before using it.
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$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );
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// Build a string of html containing all the atts for the item.
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$attributes = '';
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foreach ( $atts as $attr => $value ) {
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if ( ! empty( $value ) ) {
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$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
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$attributes .= ' ' . $attr . '="' . $value . '"';
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}
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}
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/**
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* Set a typeflag to easily test if this is a linkmod or not.
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*/
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$linkmod_type = self::get_linkmod_type( $linkmod_classes );
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/**
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* START appending the internal item contents to the output.
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*/
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$item_output = isset( $args->before ) ? $args->before : '';
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/**
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* This is the start of the internal nav item. Depending on what
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* kind of linkmod we have we may need different wrapper elements.
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*/
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if ( '' !== $linkmod_type ) {
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// is linkmod, output the required element opener.
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$item_output .= self::linkmod_element_open( $linkmod_type, $attributes );
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} else {
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// With no link mod type set this must be a standard <a> tag.
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$item_output .= '<a' . $attributes . '>';
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}
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/**
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* Initiate empty icon var, then if we have a string containing any
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* icon classes form the icon markup with an <i> element. This is
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* output inside of the item before the $title (the link text).
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*/
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$icon_html = '';
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if ( ! empty( $icon_class_string ) ) {
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// append an <i> with the icon classes to what is output before links.
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$icon_html = '<i class="' . esc_attr( $icon_class_string ) . '" aria-hidden="true"></i> ';
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}
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/** This filter is documented in wp-includes/post-template.php */
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$title = apply_filters( 'the_title', $item->title, $item->ID );
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/**
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* Filters a menu item's title.
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*
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* @since WP 4.4.0
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*
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* @param string $title The menu item's title.
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* @param WP_Post $item The current menu item.
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* @param stdClass $args An object of wp_nav_menu() arguments.
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* @param int $depth Depth of menu item. Used for padding.
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*/
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$title = apply_filters( 'nav_menu_item_title', $title, $item, $args, $depth );
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/**
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* If the .sr-only class was set apply to the nav items text only.
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*/
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if ( in_array( 'sr-only', $linkmod_classes, true ) ) {
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$title = self::wrap_for_screen_reader( $title );
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$keys_to_unset = array_keys( $linkmod_classes, 'sr-only' );
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foreach ( $keys_to_unset as $k ) {
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unset( $linkmod_classes[ $k ] );
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}
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}
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// Put the item contents into $output.
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$item_output .= isset( $args->link_before ) ? $args->link_before . $icon_html . $title . $args->link_after : '';
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/**
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* This is the end of the internal nav item. We need to close the
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* correct element depending on the type of link or link mod.
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*/
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if ( '' !== $linkmod_type ) {
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// is linkmod, output the required element opener.
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$item_output .= self::linkmod_element_close( $linkmod_type, $attributes );
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} else {
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// With no link mod type set this must be a standard <a> tag.
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$item_output .= '</a>';
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}
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$item_output .= isset( $args->after ) ? $args->after : '';
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/**
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* END appending the internal item contents to the output.
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*/
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$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
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}
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/**
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* Traverse elements to create list from elements.
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*
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* Display one element if the element doesn't have any children otherwise,
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* display the element and its children. Will only traverse up to the max
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* depth and no ignore elements under that depth. It is possible to set the
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* max depth to include all depths, see walk() method.
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*
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* This method should not be called directly, use the walk() method instead.
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*
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* @since WP 2.5.0
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*
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* @see Walker::start_lvl()
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*
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* @param object $element Data object.
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* @param array $children_elements List of elements to continue traversing (passed by reference).
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* @param int $max_depth Max depth to traverse.
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* @param int $depth Depth of current element.
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* @param array $args An array of arguments.
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* @param string $output Used to append additional content (passed by reference).
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*/
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public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
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if ( ! $element ) {
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return; }
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$id_field = $this->db_fields['id'];
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// Display this element.
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if ( is_object( $args[0] ) ) {
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$args[0]->has_children = ! empty( $children_elements[ $element->$id_field ] ); }
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parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
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}
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/**
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* Menu Fallback
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* =============
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* If this function is assigned to the wp_nav_menu's fallback_cb variable
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* and a menu has not been assigned to the theme location in the WordPress
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* menu manager the function with display nothing to a non-logged in user,
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* and will add a link to the WordPress menu manager if logged in as an admin.
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*
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* @param array $args passed from the wp_nav_menu function.
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*/
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public static function fallback( $args ) {
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if ( current_user_can( 'edit_theme_options' ) ) {
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/* Get Arguments. */
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$container = $args['container'];
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$container_id = $args['container_id'];
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$container_class = $args['container_class'];
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$menu_class = $args['menu_class'];
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$menu_id = $args['menu_id'];
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// initialize var to store fallback html.
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$fallback_output = '';
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if ( $container ) {
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$fallback_output .= '<' . esc_attr( $container );
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if ( $container_id ) {
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$fallback_output .= ' id="' . esc_attr( $container_id ) . '"';
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}
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if ( $container_class ) {
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$fallback_output .= ' class="' . esc_attr( $container_class ) . '"';
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}
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$fallback_output .= '>';
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}
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$fallback_output .= '<ul';
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if ( $menu_id ) {
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$fallback_output .= ' id="' . esc_attr( $menu_id ) . '"'; }
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if ( $menu_class ) {
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$fallback_output .= ' class="' . esc_attr( $menu_class ) . '"'; }
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$fallback_output .= '>';
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$fallback_output .= '<li><a href="' . esc_url( admin_url( 'nav-menus.php' ) ) . '" title="' . esc_attr__( 'Add a menu', 'understrap' ) . '">' . esc_html__( 'Add a menu', 'understrap' ) . '</a></li>';
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$fallback_output .= '</ul>';
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if ( $container ) {
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$fallback_output .= '</' . esc_attr( $container ) . '>';
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}
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// if $args has 'echo' key and it's true echo, otherwise return.
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if ( array_key_exists( 'echo', $args ) && $args['echo'] ) {
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echo $fallback_output; // WPCS: XSS OK.
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} else {
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return $fallback_output;
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}
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}
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}
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/**
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* Find any custom linkmod or icon classes and store in their holder
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* arrays then remove them from the main classes array.
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*
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* Supported linkmods: .disabled, .dropdown-header, .dropdown-divider, .sr-only
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* Supported iconsets: Font Awesome 4/5, Glypicons
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*
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* NOTE: This accepts the linkmod and icon arrays by reference.
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*
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* @since 4.0.0
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*
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* @param array $classes an array of classes currently assigned to the item.
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* @param array $linkmod_classes an array to hold linkmod classes.
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* @param array $icon_classes an array to hold icon classes.
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* @param integer $depth an integer holding current depth level.
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*
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* @return array $classes a maybe modified array of classnames.
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*/
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private function seporate_linkmods_and_icons_from_classes( $classes, &$linkmod_classes, &$icon_classes, $depth ) {
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// Loop through $classes array to find linkmod or icon classes.
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foreach ( $classes as $key => $class ) {
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// If any special classes are found, store the class in it's
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// holder array and and unset the item from $classes.
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if ( preg_match( '/^disabled|^sr-only/i', $class ) ) {
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// Test for .disabled or .sr-only classes.
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$linkmod_classes[] = $class;
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unset( $classes[ $key ] );
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} elseif ( preg_match( '/^dropdown-header|^dropdown-divider|^dropdown-item-text/i', $class ) && $depth > 0 ) {
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// Test for .dropdown-header or .dropdown-divider and a
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// depth greater than 0 - IE inside a dropdown.
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$linkmod_classes[] = $class;
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unset( $classes[ $key ] );
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} elseif ( preg_match( '/^fa-(\S*)?|^fa(s|r|l|b)?(\s?)?$/i', $class ) ) {
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// Font Awesome.
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$icon_classes[] = $class;
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unset( $classes[ $key ] );
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} elseif ( preg_match( '/^glyphicon-(\S*)?|^glyphicon(\s?)$/i', $class ) ) {
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// Glyphicons.
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$icon_classes[] = $class;
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unset( $classes[ $key ] );
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}
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}
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return $classes;
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}
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/**
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* Return a string containing a linkmod type and update $atts array
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* accordingly depending on the decided.
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*
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* @since 4.0.0
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*
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* @param array $linkmod_classes array of any link modifier classes.
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*
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* @return string empty for default, a linkmod type string otherwise.
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*/
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private function get_linkmod_type( $linkmod_classes = array() ) {
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$linkmod_type = '';
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// Loop through array of linkmod classes to handle their $atts.
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if ( ! empty( $linkmod_classes ) ) {
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foreach ( $linkmod_classes as $link_class ) {
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if ( ! empty( $link_class ) ) {
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// check for special class types and set a flag for them.
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if ( 'dropdown-header' === $link_class ) {
|
|
$linkmod_type = 'dropdown-header';
|
|
} elseif ( 'dropdown-divider' === $link_class ) {
|
|
$linkmod_type = 'dropdown-divider';
|
|
} elseif ( 'dropdown-item-text' === $link_class ) {
|
|
$linkmod_type = 'dropdown-item-text';
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return $linkmod_type;
|
|
}
|
|
|
|
/**
|
|
* Update the attributes of a nav item depending on the limkmod classes.
|
|
*
|
|
* @since 4.0.0
|
|
*
|
|
* @param array $atts array of atts for the current link in nav item.
|
|
* @param array $linkmod_classes an array of classes that modify link or nav item behaviors or displays.
|
|
*
|
|
* @return array maybe updated array of attributes for item.
|
|
*/
|
|
private function update_atts_for_linkmod_type( $atts = array(), $linkmod_classes = array() ) {
|
|
if ( ! empty( $linkmod_classes ) ) {
|
|
foreach ( $linkmod_classes as $link_class ) {
|
|
if ( ! empty( $link_class ) ) {
|
|
// update $atts with a space and the extra classname...
|
|
// so long as it's not a sr-only class.
|
|
if ( 'sr-only' !== $link_class ) {
|
|
$atts['class'] .= ' ' . esc_attr( $link_class );
|
|
}
|
|
// check for special class types we need additional handling for.
|
|
if ( 'disabled' === $link_class ) {
|
|
// Convert link to '#' and unset open targets.
|
|
$atts['href'] = '#';
|
|
unset( $atts['target'] );
|
|
} elseif ( 'dropdown-header' === $link_class || 'dropdown-divider' === $link_class || 'dropdown-item-text' === $link_class ) {
|
|
// Store a type flag and unset href and target.
|
|
unset( $atts['href'] );
|
|
unset( $atts['target'] );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return $atts;
|
|
}
|
|
|
|
/**
|
|
* Wraps the passed text in a screen reader only class.
|
|
*
|
|
* @since 4.0.0
|
|
*
|
|
* @param string $text the string of text to be wrapped in a screen reader class.
|
|
* @return string the string wrapped in a span with the class.
|
|
*/
|
|
private function wrap_for_screen_reader( $text = '' ) {
|
|
if ( $text ) {
|
|
$text = '<span class="sr-only">' . $text . '</span>';
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Returns the correct opening element and attributes for a linkmod.
|
|
*
|
|
* @since 4.0.0
|
|
*
|
|
* @param string $linkmod_type a sting containing a linkmod type flag.
|
|
* @param string $attributes a string of attributes to add to the element.
|
|
*
|
|
* @return string a string with the openign tag for the element with attribibutes added.
|
|
*/
|
|
private function linkmod_element_open( $linkmod_type, $attributes = '' ) {
|
|
$output = '';
|
|
if ( 'dropdown-item-text' === $linkmod_type ) {
|
|
$output .= '<span class="dropdown-item-text"' . $attributes . '>';
|
|
} elseif ( 'dropdown-header' === $linkmod_type ) {
|
|
// For a header use a span with the .h6 class instead of a real
|
|
// header tag so that it doesn't confuse screen readers.
|
|
$output .= '<span class="dropdown-header h6"' . $attributes . '>';
|
|
} elseif ( 'dropdown-divider' === $linkmod_type ) {
|
|
// this is a divider.
|
|
$output .= '<div class="dropdown-divider"' . $attributes . '>';
|
|
}
|
|
return $output;
|
|
}
|
|
|
|
/**
|
|
* Return the correct closing tag for the linkmod element.
|
|
*
|
|
* @since 4.0.0
|
|
*
|
|
* @param string $linkmod_type a string containing a special linkmod type.
|
|
*
|
|
* @return string a string with the closing tag for this linkmod type.
|
|
*/
|
|
private function linkmod_element_close( $linkmod_type ) {
|
|
$output = '';
|
|
if ( 'dropdown-header' === $linkmod_type || 'dropdown-item-text' === $linkmod_type ) {
|
|
// For a header use a span with the .h6 class instead of a real
|
|
// header tag so that it doesn't confuse screen readers.
|
|
$output .= '</span>';
|
|
} elseif ( 'dropdown-divider' === $linkmod_type ) {
|
|
// this is a divider.
|
|
$output .= '</div>';
|
|
}
|
|
return $output;
|
|
}
|
|
}
|
|
}
|