--- /dev/null
+<?php
+/**
+ * Taxonomy API: WP_Taxonomy class
+ *
+ * @package WordPress
+ * @subpackage Taxonomy
+ * @since 4.7.0
+ */
+
+/**
+ * Core class used for interacting with taxonomies.
+ *
+ * @since 4.7.0
+ */
+final class WP_Taxonomy {
+ /**
+ * Taxonomy key.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var string
+ */
+ public $name;
+
+ /**
+ * Name of the taxonomy shown in the menu. Usually plural.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var string
+ */
+ public $label;
+
+ /**
+ * An array of labels for this taxonomy.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var object
+ */
+ public $labels = array();
+
+ /**
+ * A short descriptive summary of what the taxonomy is for.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var string
+ */
+ public $description = '';
+
+ /**
+ * Whether a taxonomy is intended for use publicly either via the admin interface or by front-end users.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $public = true;
+
+ /**
+ * Whether the taxonomy is publicly queryable.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $publicly_queryable = true;
+
+ /**
+ * Whether the taxonomy is hierarchical.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $hierarchical = false;
+
+ /**
+ * Whether to generate and allow a UI for managing terms in this taxonomy in the admin.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $show_ui = true;
+
+ /**
+ * Whether to show the taxonomy in the admin menu.
+ *
+ * If true, the taxonomy is shown as a submenu of the object type menu. If false, no menu is shown.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $show_in_menu = true;
+
+ /**
+ * Whether the taxonomy is available for selection in navigation menus.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $show_in_nav_menus = true;
+
+ /**
+ * Whether to list the taxonomy in the tag cloud widget controls.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $show_tagcloud = true;
+
+ /**
+ * Whether to show the taxonomy in the quick/bulk edit panel.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $show_in_quick_edit = true;
+
+ /**
+ * Whether to display a column for the taxonomy on its post type listing screens.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $show_admin_column = false;
+
+ /**
+ * The callback function for the meta box display.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool|callable
+ */
+ public $meta_box_cb = null;
+
+ /**
+ * An array of object types this taxonomy is registered for.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var array
+ */
+ public $object_type = null;
+
+ /**
+ * Capabilities for this taxonomy.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var array
+ */
+ public $cap;
+
+ /**
+ * Rewrites information for this taxonomy.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var array|false
+ */
+ public $rewrite;
+
+ /**
+ * Query var string for this taxonomy.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var string|false
+ */
+ public $query_var;
+
+ /**
+ * Function that will be called when the count is updated.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var callable
+ */
+ public $update_count_callback;
+
+ /**
+ * Whether it is a built-in taxonomy.
+ *
+ * @since 4.7.0
+ * @access public
+ * @var bool
+ */
+ public $_builtin;
+
+ /**
+ * Constructor.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @global WP $wp WP instance.
+ *
+ * @param string $taxonomy Taxonomy key, must not exceed 32 characters.
+ * @param array|string $object_type Name of the object type for the taxonomy object.
+ * @param array|string $args Optional. Array or query string of arguments for registering a taxonomy.
+ * Default empty array.
+ */
+ public function __construct( $taxonomy, $object_type, $args = array() ) {
+ $this->name = $taxonomy;
+
+ $this->set_props( $object_type, $args );
+ }
+
+ /**
+ * Sets taxonomy properties.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param array|string $object_type Name of the object type for the taxonomy object.
+ * @param array|string $args Array or query string of arguments for registering a taxonomy.
+ */
+ public function set_props( $object_type, $args ) {
+ $args = wp_parse_args( $args );
+
+ /**
+ * Filters the arguments for registering a taxonomy.
+ *
+ * @since 4.4.0
+ *
+ * @param array $args Array of arguments for registering a taxonomy.
+ * @param string $taxonomy Taxonomy key.
+ * @param array $object_type Array of names of object types for the taxonomy.
+ */
+ $args = apply_filters( 'register_taxonomy_args', $args, $this->name, (array) $object_type );
+
+ $defaults = array(
+ 'labels' => array(),
+ 'description' => '',
+ 'public' => true,
+ 'publicly_queryable' => null,
+ 'hierarchical' => false,
+ 'show_ui' => null,
+ 'show_in_menu' => null,
+ 'show_in_nav_menus' => null,
+ 'show_tagcloud' => null,
+ 'show_in_quick_edit' => null,
+ 'show_admin_column' => false,
+ 'meta_box_cb' => null,
+ 'capabilities' => array(),
+ 'rewrite' => true,
+ 'query_var' => $this->name,
+ 'update_count_callback' => '',
+ '_builtin' => false,
+ );
+
+ $args = array_merge( $defaults, $args );
+
+ // If not set, default to the setting for public.
+ if ( null === $args['publicly_queryable'] ) {
+ $args['publicly_queryable'] = $args['public'];
+ }
+
+ if ( false !== $args['query_var'] && ( is_admin() || false !== $args['publicly_queryable'] ) ) {
+ if ( true === $args['query_var'] ) {
+ $args['query_var'] = $this->name;
+ } else {
+ $args['query_var'] = sanitize_title_with_dashes( $args['query_var'] );
+ }
+ } else {
+ // Force query_var to false for non-public taxonomies.
+ $args['query_var'] = false;
+ }
+
+ if ( false !== $args['rewrite'] && ( is_admin() || '' != get_option( 'permalink_structure' ) ) ) {
+ $args['rewrite'] = wp_parse_args( $args['rewrite'], array(
+ 'with_front' => true,
+ 'hierarchical' => false,
+ 'ep_mask' => EP_NONE,
+ ) );
+
+ if ( empty( $args['rewrite']['slug'] ) ) {
+ $args['rewrite']['slug'] = sanitize_title_with_dashes( $this->name );
+ }
+ }
+
+ // If not set, default to the setting for public.
+ if ( null === $args['show_ui'] ) {
+ $args['show_ui'] = $args['public'];
+ }
+
+ // If not set, default to the setting for show_ui.
+ if ( null === $args['show_in_menu'] || ! $args['show_ui'] ) {
+ $args['show_in_menu'] = $args['show_ui'];
+ }
+
+ // If not set, default to the setting for public.
+ if ( null === $args['show_in_nav_menus'] ) {
+ $args['show_in_nav_menus'] = $args['public'];
+ }
+
+ // If not set, default to the setting for show_ui.
+ if ( null === $args['show_tagcloud'] ) {
+ $args['show_tagcloud'] = $args['show_ui'];
+ }
+
+ // If not set, default to the setting for show_ui.
+ if ( null === $args['show_in_quick_edit'] ) {
+ $args['show_in_quick_edit'] = $args['show_ui'];
+ }
+
+ $default_caps = array(
+ 'manage_terms' => 'manage_categories',
+ 'edit_terms' => 'manage_categories',
+ 'delete_terms' => 'manage_categories',
+ 'assign_terms' => 'edit_posts',
+ );
+
+ $args['cap'] = (object) array_merge( $default_caps, $args['capabilities'] );
+ unset( $args['capabilities'] );
+
+ $args['object_type'] = array_unique( (array) $object_type );
+
+ // If not set, use the default meta box
+ if ( null === $args['meta_box_cb'] ) {
+ if ( $args['hierarchical'] ) {
+ $args['meta_box_cb'] = 'post_categories_meta_box';
+ } else {
+ $args['meta_box_cb'] = 'post_tags_meta_box';
+ }
+ }
+
+ foreach ( $args as $property_name => $property_value ) {
+ $this->$property_name = $property_value;
+ }
+
+ $this->labels = get_taxonomy_labels( $this );
+ $this->label = $this->labels->name;
+ }
+
+ /**
+ * Adds the necessary rewrite rules for the taxonomy.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @global WP $wp Current WordPress environment instance.
+ */
+ public function add_rewrite_rules() {
+ /* @var WP $wp */
+ global $wp;
+
+ // Non-publicly queryable taxonomies should not register query vars, except in the admin.
+ if ( false !== $this->query_var && $wp ) {
+ $wp->add_query_var( $this->query_var );
+ }
+
+ if ( false !== $this->rewrite && ( is_admin() || '' != get_option( 'permalink_structure' ) ) ) {
+ if ( $this->hierarchical && $this->rewrite['hierarchical'] ) {
+ $tag = '(.+?)';
+ } else {
+ $tag = '([^/]+)';
+ }
+
+ add_rewrite_tag( "%$this->name%", $tag, $this->query_var ? "{$this->query_var}=" : "taxonomy=$this->name&term=" );
+ add_permastruct( $this->name, "{$this->rewrite['slug']}/%$this->name%", $this->rewrite );
+ }
+ }
+
+ /**
+ * Removes any rewrite rules, permastructs, and rules for the taxonomy.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @global WP $wp Current WordPress environment instance.
+ */
+ public function remove_rewrite_rules() {
+ /* @var WP $wp */
+ global $wp;
+
+ // Remove query var.
+ if ( false !== $this->query_var ) {
+ $wp->remove_query_var( $this->query_var );
+ }
+
+ // Remove rewrite tags and permastructs.
+ if ( false !== $this->rewrite ) {
+ remove_rewrite_tag( "%$this->name%" );
+ remove_permastruct( $this->name );
+ }
+ }
+
+ /**
+ * Registers the ajax callback for the meta box.
+ *
+ * @since 4.7.0
+ * @access public
+ */
+ public function add_hooks() {
+ add_filter( 'wp_ajax_add-' . $this->name, '_wp_ajax_add_hierarchical_term' );
+ }
+
+ /**
+ * Removes the ajax callback for the meta box.
+ *
+ * @since 4.7.0
+ * @access public
+ */
+ public function remove_hooks() {
+ remove_filter( 'wp_ajax_add-' . $this->name, '_wp_ajax_add_hierarchical_term' );
+ }
+}
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