<?php

/**

 * Taxonomy API: Walker_Category_Checklist class

 *

 * @package WordPress

 * @subpackage Administration

 * @since 4.4.0

 */

/**

 * Core walker class to output an unordered list of category checkbox input elements.

 *

 * @since 2.5.1

 *

 * @see Walker

 * @see wp_category_checklist()

 * @see wp_terms_checklist()

 */

class Walker_Category_Checklist extends Walker {

	public $tree_type = 'category';

	public $db_fields = array ('parent' => 'parent', 'id' => 'term_id'); //TODO: decouple this

	/**

	 * Starts the list before the elements are added.

	 *

	 * @see Walker:start_lvl()

	 *

	 * @since 2.5.1

	 *

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

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

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

	 */

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

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

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

	}

	/**

	 * Ends the list of after the elements are added.

	 *

	 * @see Walker::end_lvl()

	 *

	 * @since 2.5.1

	 *

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

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

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

	 */

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

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

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

	}

	/**

	 * Start the element output.

	 *

	 * @see Walker::start_el()

	 *

	 * @since 2.5.1

	 *

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

	 * @param object $category The current term object.

	 * @param int    $depth    Depth of the term in reference to parents. Default 0.

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

	 * @param int    $id       ID of the current term.

	 */

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

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

			$taxonomy = 'category';

		} else {

			$taxonomy = $args['taxonomy'];

		}

		if ( $taxonomy == 'category' ) {

			$name = 'post_category';

		} else {

			$name = 'tax_input[' . $taxonomy . ']';

		}

		$args['popular_cats'] = empty( $args['popular_cats'] ) ? array() : $args['popular_cats'];

		$class = in_array( $category->term_id, $args['popular_cats'] ) ? ' class="popular-category"' : '';

		$args['selected_cats'] = empty( $args['selected_cats'] ) ? array() : $args['selected_cats'];

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

			$aria_checked = 'false';

			$inner_class = 'category';

			if ( in_array( $category->term_id, $args['selected_cats'] ) ) {

				$inner_class .= ' selected';

				$aria_checked = 'true';

			}

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

			$output .= "\n" . '<li' . $class . '>' .

				'<div class="' . $inner_class . '" data-term-id=' . $category->term_id .

				' tabindex="0" role="checkbox" aria-checked="' . $aria_checked . '">' .

				esc_html( apply_filters( 'the_category', $category->name, '', '' ) ) . '</div>';

		} else {

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

			$output .= "\n<li id='{$taxonomy}-{$category->term_id}'$class>" .

				'<label class="selectit"><input value="' . $category->term_id . '" type="checkbox" name="'.$name.'[]" id="in-'.$taxonomy.'-' . $category->term_id . '"' .

				checked( in_array( $category->term_id, $args['selected_cats'] ), true, false ) .

				disabled( empty( $args['disabled'] ), false, false ) . ' /> ' .

				esc_html( apply_filters( 'the_category', $category->name, '', '' ) ) . '</label>';

		}

	}

	/**

	 * Ends the element output, if needed.

	 *

	 * @see Walker::end_el()

	 *

	 * @since 2.5.1

	 *

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

	 * @param object $category The current term object.

	 * @param int    $depth    Depth of the term in reference to parents. Default 0.

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

	 */

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

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

	}

}