<?php

/**

 * Taxonomy API: Walker_Category class

 *

 * @package WordPress

 * @subpackage Template

 * @since 4.4.0

 */

/**

 * Core class used to create an HTML list of categories.

 *

 * @since 2.1.0

 *

 * @see Walker

 */

class Walker_Category extends Walker {

	/**

	 * What the class handles.

	 *

	 * @since 2.1.0

	 * @var string

	 *

	 * @see Walker::$tree_type

	 */

	public $tree_type = 'category';

	/**

	 * Database fields to use.

	 *

	 * @since 2.1.0

	 * @var array

	 *

	 * @see Walker::$db_fields

	 * @todo Decouple this

	 */

	public $db_fields = array ('parent' => 'parent', 'id' => 'term_id');

	/**

	 * Starts the list before the elements are added.

	 *

	 * @since 2.1.0

	 *

	 * @see Walker::start_lvl()

	 *

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

	 * @param int    $depth  Optional. Depth of category. Used for tab indentation. Default 0.

	 * @param array  $args   Optional. An array of arguments. Will only append content if style argument

	 *                       value is 'list'. See wp_list_categories(). Default empty array.

	 */

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

		if ( 'list' != $args['style'] )

			return;

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

		$output .= "$indent<ul class='children'>\n";

	}

	/**

	 * Ends the list of after the elements are added.

	 *

	 * @since 2.1.0

	 *

	 * @see Walker::end_lvl()

	 *

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

	 * @param int    $depth  Optional. Depth of category. Used for tab indentation. Default 0.

	 * @param array  $args   Optional. An array of arguments. Will only append content if style argument

	 *                       value is 'list'. See wp_list_categories(). Default empty array.

	 */

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

		if ( 'list' != $args['style'] )

			return;

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

		$output .= "$indent</ul>\n";

	}

	/**

	 * Starts the element output.

	 *

	 * @since 2.1.0

	 *

	 * @see Walker::start_el()

	 *

	 * @param string $output   Used to append additional content (passed by reference).

	 * @param object $category Category data object.

	 * @param int    $depth    Optional. Depth of category in reference to parents. Default 0.

	 * @param array  $args     Optional. An array of arguments. See wp_list_categories(). Default empty array.

	 * @param int    $id       Optional. ID of the current category. Default 0.

	 */

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

		/** This filter is documented in wp-includes/category-template.php */

		$cat_name = apply_filters(

			'list_cats',

			esc_attr( $category->name ),

			$category

		);

		// Don't generate an element if the category name is empty.

		if ( ! $cat_name ) {

			return;

		}

		$link = '<a href="' . esc_url( get_term_link( $category ) ) . '" ';

		if ( $args['use_desc_for_title'] && ! empty( $category->description ) ) {

			/**

			 * Filters the category description for display.

			 *

			 * @since 1.2.0

			 *

			 * @param string $description Category description.

			 * @param object $category    Category object.

			 */

			$link .= 'title="' . esc_attr( strip_tags( apply_filters( 'category_description', $category->description, $category ) ) ) . '"';

		}

		$link .= '>';

		$link .= $cat_name . '</a>';

		if ( ! empty( $args['feed_image'] ) || ! empty( $args['feed'] ) ) {

			$link .= ' ';

			if ( empty( $args['feed_image'] ) ) {

				$link .= '(';

			}

			$link .= '<a href="' . esc_url( get_term_feed_link( $category->term_id, $category->taxonomy, $args['feed_type'] ) ) . '"';

			if ( empty( $args['feed'] ) ) {

				$alt = ' alt="' . sprintf(__( 'Feed for all posts filed under %s' ), $cat_name ) . '"';

			} else {

				$alt = ' alt="' . $args['feed'] . '"';

				$name = $args['feed'];

				$link .= empty( $args['title'] ) ? '' : $args['title'];

			}

			$link .= '>';

			if ( empty( $args['feed_image'] ) ) {

				$link .= $name;

			} else {

				$link .= "<img src='" . $args['feed_image'] . "'$alt" . ' />';

			}

			$link .= '</a>';

			if ( empty( $args['feed_image'] ) ) {

				$link .= ')';

			}

		}

		if ( ! empty( $args['show_count'] ) ) {

			$link .= ' (' . number_format_i18n( $category->count ) . ')';

		}

		if ( 'list' == $args['style'] ) {

			$output .= "\t<li";

			$css_classes = array(

				'cat-item',

				'cat-item-' . $category->term_id,

			);

			if ( ! empty( $args['current_category'] ) ) {

				// 'current_category' can be an array, so we use `get_terms()`.

				$_current_terms = get_terms( $category->taxonomy, array(

					'include' => $args['current_category'],

					'hide_empty' => false,

				) );

				foreach ( $_current_terms as $_current_term ) {

					if ( $category->term_id == $_current_term->term_id ) {

						$css_classes[] = 'current-cat';

					} elseif ( $category->term_id == $_current_term->parent ) {

						$css_classes[] = 'current-cat-parent';

					}

					while ( $_current_term->parent ) {

						if ( $category->term_id == $_current_term->parent ) {

							$css_classes[] =  'current-cat-ancestor';

							break;

						}

						$_current_term = get_term( $_current_term->parent, $category->taxonomy );

					}

				}

			}

			/**

			 * Filters the list of CSS classes to include with each category in the list.

			 *

			 * @since 4.2.0

			 *

			 * @see wp_list_categories()

			 *

			 * @param array  $css_classes An array of CSS classes to be applied to each list item.

			 * @param object $category    Category data object.

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

			 * @param array  $args        An array of wp_list_categories() arguments.

			 */

			$css_classes = implode( ' ', apply_filters( 'category_css_class', $css_classes, $category, $depth, $args ) );

			$output .=  ' class="' . $css_classes . '"';

			$output .= ">$link\n";

		} elseif ( isset( $args['separator'] ) ) {

			$output .= "\t$link" . $args['separator'] . "\n";

		} else {

			$output .= "\t$link<br />\n";

		}

	}

	/**

	 * Ends the element output, if needed.

	 *

	 * @since 2.1.0

	 *

	 * @see Walker::end_el()

	 *

	 * @param string $output Used to append additional content (passed by reference).

	 * @param object $page   Not used.

	 * @param int    $depth  Optional. Depth of category. Not used.

	 * @param array  $args   Optional. An array of arguments. Only uses 'list' for whether should append

	 *                       to output. See wp_list_categories(). Default empty array.

	 */

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

		if ( 'list' != $args['style'] )

			return;

		$output .= "</li>\n";

	}

}