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<?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";
}
}