<?php







/**



 * Class Name: wp_bootstrap_navwalker



 * GitHub URI: https://github.com/twittem/wp-bootstrap-navwalker



 * Description: A custom WordPress nav walker class to implement the Bootstrap 3 navigation style in a custom theme using the WordPress built in menu manager.



 * Version: 2.0.4



 * Author: Edward McIntyre - @twittem



 * License: GPL-2.0+



 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt



 */







class Bunch_Bootstrap_walker extends Walker_Nav_Menu {







	/**



	 * @see Walker::start_lvl()



	 * @since 3.0.0



	 *



	 * @param string $output Passed by reference. Used to append additional content.



	 * @param int $depth Depth of page. Used for padding.



	 */



	public function start_lvl( &$output, $depth = 0, $args = array() ) {



		$indent = str_repeat( "\t", $depth );



		$output .= "\n$indent<ul role=\"menu\" class=\" dropdown-menu\">\n";



	}







	/**



	 * @see Walker::start_el()



	 * @since 3.0.0



	 *



	 * @param string $output Passed by reference. Used to append additional content.



	 * @param object $item Menu item data object.



	 * @param int $depth Depth of menu item. Used for padding.



	 * @param int $current_page Menu item ID.



	 * @param object $args



	 */



	public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {



		$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';







		/**



		 * Dividers, Headers or Disabled



		 * =============================



		 * Determine whether the item is a Divider, Header, Disabled or regular



		 * menu item. To prevent errors we use the strcasecmp() function to so a



		 * comparison that is not case sensitive. The strcasecmp() function returns



		 * a 0 if the strings are equal.



		 */



		if ( strcasecmp( $item->attr_title, 'divider' ) == 0 && $depth === 1 ) {



			$output .= $indent . '<li role="presentation" class="divider">';



		} else if ( strcasecmp( $item->title, 'divider') == 0 && $depth === 1 ) {



			$output .= $indent . '<li role="presentation" class="divider">';



		} else if ( strcasecmp( $item->attr_title, 'dropdown-header') == 0 && $depth === 1 ) {



			$output .= $indent . '<li role="presentation" class="dropdown-header">' . esc_attr( $item->title );



		} else if ( strcasecmp($item->attr_title, 'disabled' ) == 0 ) {



			$output .= $indent . '<li role="presentation" class="disabled"><a href="#">' . esc_attr( $item->title ) . '</a>';



		} else {







			$class_names = $value = '';







			$classes = empty( $item->classes ) ? array() : (array) $item->classes;



			$classes[] = 'menu-item-' . $item->ID;







			$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );







			if ( $args->has_children )



				$class_names .= ' dropdown';







			if ( in_array( 'current-menu-item', $classes ) )



				$class_names .= ' active';







			$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';







			$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );



			$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';







			$output .= $indent . '<li' . $id . $value . $class_names .'>';







			$atts = array();



			$atts['title']  = ! empty( $item->title )	? $item->title	: '';



			$atts['target'] = ! empty( $item->target )	? $item->target	: '';



			$atts['rel']    = ! empty( $item->xfn )		? $item->xfn	: '';







			// If item has_children add atts to a.



			if ( $args->has_children && $depth === 0 ) {



				$atts['href']   		= ! empty( $item->url ) ? $item->url : '';



				$atts['data-toggle']	= 'dropdown';



				$atts['class']			= 'dropdown-toggle disabled';



				$atts['aria-haspopup']	= 'true';



			} else {



				$atts['href'] = ! empty( $item->url ) ? $item->url : '';



			}







			$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args );







			$attributes = '';



			foreach ( $atts as $attr => $value ) {



				if ( ! empty( $value ) ) {



					$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );



					$attributes .= ' ' . $attr . '="' . $value . '"';



				}



			}







			$item_output = $args->before;







			/*



			 * Glyphicons



			 * ===========



			 * Since the the menu item is NOT a Divider or Header we check the see



			 * if there is a value in the attr_title property. If the attr_title



			 * property is NOT null we apply it as the class name for the glyphicon.



			 */



			if ( ! empty( $item->attr_title ) )



				$item_output .= '<a'. $attributes .'><span class="glyphicon ' . esc_attr( $item->attr_title ) . '"></span>&nbsp;';



			else



				$item_output .= '<a'. $attributes .'>';







			$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;



			$item_output .= ( $args->has_children && 0 === $depth ) ? ' <b class="caret"></b></a>' : '</a>';



			$item_output .= $args->after;







			$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );



		}



	}







	/**



	 * Traverse elements to create list from elements.



	 *



	 * Display one element if the element doesn't have any children otherwise,



	 * display the element and its children. Will only traverse up to the max



	 * depth and no ignore elements under that depth.



	 *



	 * This method shouldn't be called directly, use the walk() method instead.



	 *



	 * @see Walker::start_el()



	 * @since 2.5.0



	 *



	 * @param object $element Data object



	 * @param array $children_elements List of elements to continue traversing.



	 * @param int $max_depth Max depth to traverse.



	 * @param int $depth Depth of current element.



	 * @param array $args



	 * @param string $output Passed by reference. Used to append additional content.



	 * @return null Null on failure with no changes to parameters.



	 */



	public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {



        if ( ! $element )



            return;







        $id_field = $this->db_fields['id'];







        // Display this element.



        if ( is_object( $args[0] ) )



           $args[0]->has_children = ! empty( $children_elements[ $element->$id_field ] );







        parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );



    }







	/**



	 * Menu Fallback



	 * =============



	 * If this function is assigned to the wp_nav_menu's fallback_cb variable



	 * and a manu has not been assigned to the theme location in the WordPress



	 * menu manager the function with display nothing to a non-logged in user,



	 * and will add a link to the WordPress menu manager if logged in as an admin.



	 *



	 * @param array $args passed from the wp_nav_menu function.



	 *



	 */



	public static function fallback( $args ) {



		if ( current_user_can( 'manage_options' ) ) {







			extract( $args );







			$fb_output = null;







			if ( $container ) {



				$fb_output = '<' . $container;







				if ( $container_id )



					$fb_output .= ' id="' . $container_id . '"';







				if ( $container_class )



					$fb_output .= ' class="' . $container_class . '"';







				$fb_output .= '>';



			}







			$fb_output .= '<ul';







			if ( $menu_id )



				$fb_output .= ' id="' . $menu_id . '"';







			if ( $menu_class )



				$fb_output .= ' class="' . $menu_class . '"';







			$fb_output .= '>';



			$fb_output .= '<li><a href="' . admin_url( 'nav-menus.php' ) . '">Add a menu</a></li>';



			$fb_output .= '</ul>';







			if ( $container )



				$fb_output .= '</' . $container . '>';







			echo $fb_output;



		}



	}



}



