--- /dev/null
+<?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.
+ *
+ * @see Walker::$tree_type
+ * @since 2.1.0
+ * @var string
+ */
+ public $tree_type = 'category';
+
+ /**
+ * Database fields to use.
+ *
+ * @see Walker::$db_fields
+ * @since 2.1.0
+ * @todo Decouple this
+ * @var array
+ */
+ public $db_fields = array ('parent' => 'parent', 'id' => 'term_id');
+
+ /**
+ * Starts the list before the elements are added.
+ *
+ * @see Walker::start_lvl()
+ *
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param int $depth Depth of category. Used for tab indentation.
+ * @param array $args An array of arguments. Will only append content if style argument value is 'list'.
+ * @see wp_list_categories()
+ */
+ public function start_lvl( &$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.
+ *
+ * @see Walker::end_lvl()
+ *
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param int $depth Depth of category. Used for tab indentation.
+ * @param array $args An array of arguments. Will only append content if style argument value is 'list'.
+ * @wsee wp_list_categories()
+ */
+ public function end_lvl( &$output, $depth = 0, $args = array() ) {
+ if ( 'list' != $args['style'] )
+ return;
+
+ $indent = str_repeat("\t", $depth);
+ $output .= "$indent</ul>\n";
+ }
+
+ /**
+ * Start the element output.
+ *
+ * @see Walker::start_el()
+ *
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param object $category Category data object.
+ * @param int $depth Depth of category in reference to parents. Default 0.
+ * @param array $args An array of arguments. @see wp_list_categories()
+ * @param int $id ID of the current category.
+ */
+ public function start_el( &$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 ) ) {
+ /**
+ * Filter 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';
+ }
+ }
+ }
+
+ /**
+ * Filter 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.
+ *
+ * @see Walker::end_el()
+ *
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param object $page Not used.
+ * @param int $depth Depth of category. Not used.
+ * @param array $args An array of arguments. Only uses 'list' for whether should append to output. @see wp_list_categories()
+ */
+ public function end_el( &$output, $page, $depth = 0, $args = array() ) {
+ if ( 'list' != $args['style'] )
+ return;
+
+ $output .= "</li>\n";
+ }
+
+}
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