HTML Examples/WP.iso/wordpress/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php

PHP Script | 2017-10-17 | 26.3 KB | 890 lines

<?php
/**
 * Customize API: WP_Customize_Nav_Menu_Item_Setting class
 *
 * @package WordPress
 * @subpackage Customize
 * @since 4.4.0
 */

/**
 * Customize Setting to represent a nav_menu.
 *
 * Subclass of WP_Customize_Setting to represent a nav_menu taxonomy term, and
 * the IDs for the nav_menu_items associated with the nav menu.
 *
 * @since 4.3.0
 *
 * @see WP_Customize_Setting
 */
class WP_Customize_Nav_Menu_Item_Setting extends WP_Customize_Setting {

    const ID_PATTERN = '/^nav_menu_item\[(?P<id>-?\d+)\]$/';

    const POST_TYPE = 'nav_menu_item';

    const TYPE = 'nav_menu_item';

    /**
     * Setting type.
     *
     * @since 4.3.0
     * @var string
     */
    public $type = self::TYPE;

    /**
     * Default setting value.
     *
     * @since 4.3.0
     * @var array
     *
     * @see wp_setup_nav_menu_item()
     */
    public $default = array(
        // The $menu_item_data for wp_update_nav_menu_item().
        'object_id'        => 0,
        'object'           => '', // Taxonomy name.
        'menu_item_parent' => 0, // A.K.A. menu-item-parent-id; note that post_parent is different, and not included.
        'position'         => 0, // A.K.A. menu_order.
        'type'             => 'custom', // Note that type_label is not included here.
        'title'            => '',
        'url'              => '',
        'target'           => '',
        'attr_title'       => '',
        'description'      => '',
        'classes'          => '',
        'xfn'              => '',
        'status'           => 'publish',
        'original_title'   => '',
        'nav_menu_term_id' => 0, // This will be supplied as the $menu_id arg for wp_update_nav_menu_item().
        '_invalid'         => false,
    );

    /**
     * Default transport.
     *
     * @since 4.3.0
     * @since 4.5.0 Default changed to 'refresh'
     * @var string
     */
    public $transport = 'refresh';

    /**
     * The post ID represented by this setting instance. This is the db_id.
     *
     * A negative value represents a placeholder ID for a new menu not yet saved.
     *
     * @since 4.3.0
     * @var int
     */
    public $post_id;

    /**
     * Storage of pre-setup menu item to prevent wasted calls to wp_setup_nav_menu_item().
     *
     * @since 4.3.0
     * @var array
     */
    protected $value;

    /**
     * Previous (placeholder) post ID used before creating a new menu item.
     *
     * This value will be exported to JS via the customize_save_response filter
     * so that JavaScript can update the settings to refer to the newly-assigned
     * post ID. This value is always negative to indicate it does not refer to
     * a real post.
     *
     * @since 4.3.0
     * @var int
     *
     * @see WP_Customize_Nav_Menu_Item_Setting::update()
     * @see WP_Customize_Nav_Menu_Item_Setting::amend_customize_save_response()
     */
    public $previous_post_id;

    /**
     * When previewing or updating a menu item, this stores the previous nav_menu_term_id
     * which ensures that we can apply the proper filters.
     *
     * @since 4.3.0
     * @var int
     */
    public $original_nav_menu_term_id;

    /**
     * Whether or not update() was called.
     *
     * @since 4.3.0
     * @var bool
     */
    protected $is_updated = false;

    /**
     * Status for calling the update method, used in customize_save_response filter.
     *
     * See {@see 'customize_save_response'}.
     *
     * When status is inserted, the placeholder post ID is stored in $previous_post_id.
     * When status is error, the error is stored in $update_error.
     *
     * @since 4.3.0
     * @var string updated|inserted|deleted|error
     *
     * @see WP_Customize_Nav_Menu_Item_Setting::update()
     * @see WP_Customize_Nav_Menu_Item_Setting::amend_customize_save_response()
     */
    public $update_status;

    /**
     * Any error object returned by wp_update_nav_menu_item() when setting is updated.
     *
     * @since 4.3.0
     * @var WP_Error
     *
     * @see WP_Customize_Nav_Menu_Item_Setting::update()
     * @see WP_Customize_Nav_Menu_Item_Setting::amend_customize_save_response()
     */
    public $update_error;

    /**
     * Constructor.
     *
     * Any supplied $args override class property defaults.
     *
     * @since 4.3.0
     *
     * @param WP_Customize_Manager $manager Bootstrap Customizer instance.
     * @param string               $id      An specific ID of the setting. Can be a
     *                                      theme mod or option name.
     * @param array                $args    Optional. Setting arguments.
     *
     * @throws Exception If $id is not valid for this setting type.
     */
    public function __construct( WP_Customize_Manager $manager, $id, array $args = array() ) {
        if ( empty( $manager->nav_menus ) ) {
            throw new Exception( 'Expected WP_Customize_Manager::$nav_menus to be set.' );
        }

        if ( ! preg_match( self::ID_PATTERN, $id, $matches ) ) {
            throw new Exception( "Illegal widget setting ID: $id" );
        }

        $this->post_id = intval( $matches['id'] );
        add_action( 'wp_update_nav_menu_item', array( $this, 'flush_cached_value' ), 10, 2 );

        parent::__construct( $manager, $id, $args );

        // Ensure that an initially-supplied value is valid.
        if ( isset( $this->value ) ) {
            $this->populate_value();
            foreach ( array_diff( array_keys( $this->default ), array_keys( $this->value ) ) as $missing ) {
                throw new Exception( "Supplied nav_menu_item value missing property: $missing" );
            }
        }

    }

    /**
     * Clear the cached value when this nav menu item is updated.
     *
     * @since 4.3.0
     *
     * @param int $menu_id       The term ID for the menu.
     * @param int $menu_item_id  The post ID for the menu item.
     */
    public function flush_cached_value( $menu_id, $menu_item_id ) {
        unset( $menu_id );
        if ( $menu_item_id === $this->post_id ) {
            $this->value = null;
        }
    }

    /**
     * Get the instance data for a given nav_menu_item setting.
     *
     * @since 4.3.0
     *
     * @see wp_setup_nav_menu_item()
     *
     * @return array|false Instance data array, or false if the item is marked for deletion.
     */
    public function value() {
        if ( $this->is_previewed && $this->_previewed_blog_id === get_current_blog_id() ) {
            $undefined  = new stdClass(); // Symbol.
            $post_value = $this->post_value( $undefined );

            if ( $undefined === $post_value ) {
                $value = $this->_original_value;
            } else {
                $value = $post_value;
            }
            if ( ! empty( $value ) && empty( $value['original_title'] ) ) {
                $value['original_title'] = $this->get_original_title( (object) $value );
            }
        } elseif ( isset( $this->value ) ) {
            $value = $this->value;
        } else {
            $value = false;

            // Note that a ID of less than one indicates a nav_menu not yet inserted.
            if ( $this->post_id > 0 ) {
                $post = get_post( $this->post_id );
                if ( $post && self::POST_TYPE === $post->post_type ) {
                    $is_title_empty = empty( $post->post_title );
                    $value = (array) wp_setup_nav_menu_item( $post );
                    if ( $is_title_empty ) {
                        $value['title'] = '';
                    }
                }
            }

            if ( ! is_array( $value ) ) {
                $value = $this->default;
            }

            // Cache the value for future calls to avoid having to re-call wp_setup_nav_menu_item().
            $this->value = $value;
            $this->populate_value();
            $value = $this->value;
        }

        if ( ! empty( $value ) && empty( $value['type_label'] ) ) {
            $value['type_label'] = $this->get_type_label( (object) $value );
        }

        return $value;
    }

    /**
     * Get original title.
     *
     * @since 4.7.0
     *
     * @param object $item Nav menu item.
     * @return string The original title.
     */
    protected function get_original_title( $item ) {
        $original_title = '';
        if ( 'post_type' === $item->type && ! empty( $item->object_id ) ) {
            $original_object = get_post( $item->object_id );
            if ( $original_object ) {
                /** This filter is documented in wp-includes/post-template.php */
                $original_title = apply_filters( 'the_title', $original_object->post_title, $original_object->ID );

                if ( '' === $original_title ) {
                    /* translators: %d: ID of a post */
                    $original_title = sprintf( __( '#%d (no title)' ), $original_object->ID );
                }
            }
        } elseif ( 'taxonomy' === $item->type && ! empty( $item->object_id ) ) {
            $original_term_title = get_term_field( 'name', $item->object_id, $item->object, 'raw' );
            if ( ! is_wp_error( $original_term_title ) ) {
                $original_title = $original_term_title;
            }
        } elseif ( 'post_type_archive' === $item->type ) {
            $original_object = get_post_type_object( $item->object );
            if ( $original_object ) {
                $original_title = $original_object->labels->archives;
            }
        }
        $original_title = html_entity_decode( $original_title, ENT_QUOTES, get_bloginfo( 'charset' ) );
        return $original_title;
    }

    /**
     * Get type label.
     *
     * @since 4.7.0
     *
     * @param object $item Nav menu item.
     * @returns string The type label.
     */
    protected function get_type_label( $item ) {
        if ( 'post_type' === $item->type ) {
            $object = get_post_type_object( $item->object );
            if ( $object ) {
                $type_label = $object->labels->singular_name;
            } else {
                $type_label = $item->object;
            }
        } elseif ( 'taxonomy' === $item->type ) {
            $object = get_taxonomy( $item->object );
            if ( $object ) {
                $type_label = $object->labels->singular_name;
            } else {
                $type_label = $item->object;
            }
        } elseif ( 'post_type_archive' === $item->type ) {
            $type_label = __( 'Post Type Archive' );
        } else {
            $type_label = __( 'Custom Link' );
        }
        return $type_label;
    }

    /**
     * Ensure that the value is fully populated with the necessary properties.
     *
     * Translates some properties added by wp_setup_nav_menu_item() and removes others.
     *
     * @since 4.3.0
     *
     * @see WP_Customize_Nav_Menu_Item_Setting::value()
     */
    protected function populate_value() {
        if ( ! is_array( $this->value ) ) {
            return;
        }

        if ( isset( $this->value['menu_order'] ) ) {
            $this->value['position'] = $this->value['menu_order'];
            unset( $this->value['menu_order'] );
        }
        if ( isset( $this->value['post_status'] ) ) {
            $this->value['status'] = $this->value['post_status'];
            unset( $this->value['post_status'] );
        }

        if ( ! isset( $this->value['original_title'] ) ) {
            $this->value['original_title'] = $this->get_original_title( (object) $this->value );
        }

        if ( ! isset( $this->value['nav_menu_term_id'] ) && $this->post_id > 0 ) {
            $menus = wp_get_post_terms( $this->post_id, WP_Customize_Nav_Menu_Setting::TAXONOMY, array(
                'fields' => 'ids',
            ) );
            if ( ! empty( $menus ) ) {
                $this->value['nav_menu_term_id'] = array_shift( $menus );
            } else {
                $this->value['nav_menu_term_id'] = 0;
            }
        }

        foreach ( array( 'object_id', 'menu_item_parent', 'nav_menu_term_id' ) as $key ) {
            if ( ! is_int( $this->value[ $key ] ) ) {
                $this->value[ $key ] = intval( $this->value[ $key ] );
            }
        }
        foreach ( array( 'classes', 'xfn' ) as $key ) {
            if ( is_array( $this->value[ $key ] ) ) {
                $this->value[ $key ] = implode( ' ', $this->value[ $key ] );
            }
        }

        if ( ! isset( $this->value['title'] ) ) {
            $this->value['title'] = '';
        }

        if ( ! isset( $this->value['_invalid'] ) ) {
            $this->value['_invalid'] = false;
            $is_known_invalid = (
                ( ( 'post_type' === $this->value['type'] || 'post_type_archive' === $this->value['type'] ) && ! post_type_exists( $this->value['object'] ) )
                ||
                ( 'taxonomy' === $this->value['type'] && ! taxonomy_exists( $this->value['object'] ) )
            );
            if ( $is_known_invalid ) {
                $this->value['_invalid'] = true;
            }
        }

        // Remove remaining properties available on a setup nav_menu_item post object which aren't relevant to the setting value.
        $irrelevant_properties = array(
            'ID',
            'comment_count',
            'comment_status',
            'db_id',
            'filter',
            'guid',
            'ping_status',
            'pinged',
            'post_author',
            'post_content',
            'post_content_filtered',
            'post_date',
            'post_date_gmt',
            'post_excerpt',
            'post_mime_type',
            'post_modified',
            'post_modified_gmt',
            'post_name',
            'post_parent',
            'post_password',
            'post_title',
            'post_type',
            'to_ping',
        );
        foreach ( $irrelevant_properties as $property ) {
            unset( $this->value[ $property ] );
        }
    }

    /**
     * Handle previewing the setting.
     *
     * @since 4.3.0
     * @since 4.4.0 Added boolean return value.
     *
     * @see WP_Customize_Manager::post_value()
     *
     * @return bool False if method short-circuited due to no-op.
     */
    public function preview() {
        if ( $this->is_previewed ) {
            return false;
        }

        $undefined = new stdClass();
        $is_placeholder = ( $this->post_id < 0 );
        $is_dirty = ( $undefined !== $this->post_value( $undefined ) );
        if ( ! $is_placeholder && ! $is_dirty ) {
            return false;
        }

        $this->is_previewed              = true;
        $this->_original_value           = $this->value();
        $this->original_nav_menu_term_id = $this->_original_value['nav_menu_term_id'];
        $this->_previewed_blog_id        = get_current_blog_id();

        add_filter( 'wp_get_nav_menu_items', array( $this, 'filter_wp_get_nav_menu_items' ), 10, 3 );

        $sort_callback = array( __CLASS__, 'sort_wp_get_nav_menu_items' );
        if ( ! has_filter( 'wp_get_nav_menu_items', $sort_callback ) ) {
            add_filter( 'wp_get_nav_menu_items', array( __CLASS__, 'sort_wp_get_nav_menu_items' ), 1000, 3 );
        }

        // @todo Add get_post_metadata filters for plugins to add their data.

        return true;
    }

    /**
     * Filters the wp_get_nav_menu_items() result to supply the previewed menu items.
     *
     * @since 4.3.0
     *
     * @see wp_get_nav_menu_items()
     *
     * @param array  $items An array of menu item post objects.
     * @param object $menu  The menu object.
     * @param array  $args  An array of arguments used to retrieve menu item objects.
     * @return array Array of menu items,
     */
    public function filter_wp_get_nav_menu_items( $items, $menu, $args ) {
        $this_item = $this->value();
        $current_nav_menu_term_id = $this_item['nav_menu_term_id'];
        unset( $this_item['nav_menu_term_id'] );

        $should_filter = (
            $menu->term_id === $this->original_nav_menu_term_id
            ||
            $menu->term_id === $current_nav_menu_term_id
        );
        if ( ! $should_filter ) {
            return $items;
        }

        // Handle deleted menu item, or menu item moved to another menu.
        $should_remove = (
            false === $this_item
            ||
            true === $this_item['_invalid']
            ||
            (
                $this->original_nav_menu_term_id === $menu->term_id
                &&
                $current_nav_menu_term_id !== $this->original_nav_menu_term_id
            )
        );
        if ( $should_remove ) {
            $filtered_items = array();
            foreach ( $items as $item ) {
                if ( $item->db_id !== $this->post_id ) {
                    $filtered_items[] = $item;
                }
            }
            return $filtered_items;
        }

        $mutated = false;
        $should_update = (
            is_array( $this_item )
            &&
            $current_nav_menu_term_id === $menu->term_id
        );
        if ( $should_update ) {
            foreach ( $items as $item ) {
                if ( $item->db_id === $this->post_id ) {
                    foreach ( get_object_vars( $this->value_as_wp_post_nav_menu_item() ) as $key => $value ) {
                        $item->$key = $value;
                    }
                    $mutated = true;
                }
            }

            // Not found so we have to append it..
            if ( ! $mutated ) {
                $items[] = $this->value_as_wp_post_nav_menu_item();
            }
        }

        return $items;
    }

    /**
     * Re-apply the tail logic also applied on $items by wp_get_nav_menu_items().
     *
     * @since 4.3.0
     * @static
     *
     * @see wp_get_nav_menu_items()
     *
     * @param array  $items An array of menu item post objects.
     * @param object $menu  The menu object.
     * @param array  $args  An array of arguments used to retrieve menu item objects.
     * @return array Array of menu items,
     */
    public static function sort_wp_get_nav_menu_items( $items, $menu, $args ) {
        // @todo We should probably re-apply some constraints imposed by $args.
        unset( $args['include'] );

        // Remove invalid items only in front end.
        if ( ! is_admin() ) {
            $items = array_filter( $items, '_is_valid_nav_menu_item' );
        }

        if ( ARRAY_A === $args['output'] ) {
            $items = wp_list_sort( $items, array(
                $args['output_key'] => 'ASC',
            ) );
            $i = 1;

            foreach ( $items as $k => $item ) {
                $items[ $k ]->{$args['output_key']} = $i++;
            }
        }

        return $items;
    }

    /**
     * Get the value emulated into a WP_Post and set up as a nav_menu_item.
     *
     * @since 4.3.0
     *
     * @return WP_Post With wp_setup_nav_menu_item() applied.
     */
    public function value_as_wp_post_nav_menu_item() {
        $item = (object) $this->value();
        unset( $item->nav_menu_term_id );

        $item->post_status = $item->status;
        unset( $item->status );

        $item->post_type = 'nav_menu_item';
        $item->menu_order = $item->position;
        unset( $item->position );

        if ( empty( $item->original_title ) ) {
            $item->original_title = $this->get_original_title( $item );
        }
        if ( empty( $item->title ) && ! empty( $item->original_title ) ) {
            $item->title = $item->original_title;
        }
        if ( $item->title ) {
            $item->post_title = $item->title;
        }

        $item->ID = $this->post_id;
        $item->db_id = $this->post_id;
        $post = new WP_Post( (object) $item );

        if ( empty( $post->post_author ) ) {
            $post->post_author = get_current_user_id();
        }

        if ( ! isset( $post->type_label ) ) {
            $post->type_label = $this->get_type_label( $post );
        }

        // Ensure nav menu item URL is set according to linked object.
        if ( 'post_type' === $post->type && ! empty( $post->object_id ) ) {
            $post->url = get_permalink( $post->object_id );
        } elseif ( 'taxonomy' === $post->type && ! empty( $post->object ) && ! empty( $post->object_id ) ) {
            $post->url = get_term_link( (int) $post->object_id, $post->object );
        } elseif ( 'post_type_archive' === $post->type && ! empty( $post->object ) ) {
            $post->url = get_post_type_archive_link( $post->object );
        }
        if ( is_wp_error( $post->url ) ) {
            $post->url = '';
        }

        /** This filter is documented in wp-includes/nav-menu.php */
        $post->attr_title = apply_filters( 'nav_menu_attr_title', $post->attr_title );

        /** This filter is documented in wp-includes/nav-menu.php */
        $post->description = apply_filters( 'nav_menu_description', wp_trim_words( $post->description, 200 ) );

        /** This filter is documented in wp-includes/nav-menu.php */
        $post = apply_filters( 'wp_setup_nav_menu_item', $post );

        return $post;
    }

    /**
     * Sanitize an input.
     *
     * Note that parent::sanitize() erroneously does wp_unslash() on $value, but
     * we remove that in this override.
     *
     * @since 4.3.0
     *
     * @param array $menu_item_value The value to sanitize.
     * @return array|false|null|WP_Error Null or WP_Error if an input isn't valid. False if it is marked for deletion.
     *                                   Otherwise the sanitized value.
     */
    public function sanitize( $menu_item_value ) {
        // Menu is marked for deletion.
        if ( false === $menu_item_value ) {
            return $menu_item_value;
        }

        // Invalid.
        if ( ! is_array( $menu_item_value ) ) {
            return null;
        }

        $default = array(
            'object_id'        => 0,
            'object'           => '',
            'menu_item_parent' => 0,
            'position'         => 0,
            'type'             => 'custom',
            'title'            => '',
            'url'              => '',
            'target'           => '',
            'attr_title'       => '',
            'description'      => '',
            'classes'          => '',
            'xfn'              => '',
            'status'           => 'publish',
            'original_title'   => '',
            'nav_menu_term_id' => 0,
            '_invalid'         => false,
        );
        $menu_item_value = array_merge( $default, $menu_item_value );
        $menu_item_value = wp_array_slice_assoc( $menu_item_value, array_keys( $default ) );
        $menu_item_value['position'] = intval( $menu_item_value['position'] );

        foreach ( array( 'object_id', 'menu_item_parent', 'nav_menu_term_id' ) as $key ) {
            // Note we need to allow negative-integer IDs for previewed objects not inserted yet.
            $menu_item_value[ $key ] = intval( $menu_item_value[ $key ] );
        }

        foreach ( array( 'type', 'object', 'target' ) as $key ) {
            $menu_item_value[ $key ] = sanitize_key( $menu_item_value[ $key ] );
        }

        foreach ( array( 'xfn', 'classes' ) as $key ) {
            $value = $menu_item_value[ $key ];
            if ( ! is_array( $value ) ) {
                $value = explode( ' ', $value );
            }
            $menu_item_value[ $key ] = implode( ' ', array_map( 'sanitize_html_class', $value ) );
        }

        $menu_item_value['original_title'] = sanitize_text_field( $menu_item_value['original_title'] );

        // Apply the same filters as when calling wp_insert_post().

        /** This filter is documented in wp-includes/post.php */
        $menu_item_value['title'] = wp_unslash( apply_filters( 'title_save_pre', wp_slash( $menu_item_value['title'] ) ) );

        /** This filter is documented in wp-includes/post.php */
        $menu_item_value['attr_title'] = wp_unslash( apply_filters( 'excerpt_save_pre', wp_slash( $menu_item_value['attr_title'] ) ) );

        /** This filter is documented in wp-includes/post.php */
        $menu_item_value['description'] = wp_unslash( apply_filters( 'content_save_pre', wp_slash( $menu_item_value['description'] ) ) );

        if ( '' !== $menu_item_value['url'] ) {
            $menu_item_value['url'] = esc_url_raw( $menu_item_value['url'] );
            if ( '' === $menu_item_value['url'] ) {
                return new WP_Error( 'invalid_url', __( 'Invalid URL.' ) ); // Fail sanitization if URL is invalid.
            }
        }
        if ( 'publish' !== $menu_item_value['status'] ) {
            $menu_item_value['status'] = 'draft';
        }

        $menu_item_value['_invalid'] = (bool) $menu_item_value['_invalid'];

        /** This filter is documented in wp-includes/class-wp-customize-setting.php */
        return apply_filters( "customize_sanitize_{$this->id}", $menu_item_value, $this );
    }

    /**
     * Creates/updates the nav_menu_item post for this setting.
     *
     * Any created menu items will have their assigned post IDs exported to the client
     * via the {@see 'customize_save_response'} filter. Likewise, any errors will be
     * exported to the client via the customize_save_response() filter.
     *
     * To delete a menu, the client can send false as the value.
     *
     * @since 4.3.0
     *
     * @see wp_update_nav_menu_item()
     *
     * @param array|false $value The menu item array to update. If false, then the menu item will be deleted
     *                           entirely. See WP_Customize_Nav_Menu_Item_Setting::$default for what the value
     *                           should consist of.
     * @return null|void
     */
    protected function update( $value ) {
        if ( $this->is_updated ) {
            return;
        }

        $this->is_updated = true;
        $is_placeholder   = ( $this->post_id < 0 );
        $is_delete        = ( false === $value );

        // Update the cached value.
        $this->value = $value;

        add_filter( 'customize_save_response', array( $this, 'amend_customize_save_response' ) );

        if ( $is_delete ) {
            // If the current setting post is a placeholder, a delete request is a no-op.
            if ( $is_placeholder ) {
                $this->update_status = 'deleted';
            } else {
                $r = wp_delete_post( $this->post_id, true );

                if ( false === $r ) {
                    $this->update_error  = new WP_Error( 'delete_failure' );
                    $this->update_status = 'error';
                } else {
                    $this->update_status = 'deleted';
                }
                // @todo send back the IDs for all associated nav menu items deleted, so these settings (and controls) can be removed from Customizer?
            }
        } else {

            // Handle saving menu items for menus that are being newly-created.
            if ( $value['nav_menu_term_id'] < 0 ) {
                $nav_menu_setting_id = sprintf( 'nav_menu[%s]', $value['nav_menu_term_id'] );
                $nav_menu_setting    = $this->manager->get_setting( $nav_menu_setting_id );

                if ( ! $nav_menu_setting || ! ( $nav_menu_setting instanceof WP_Customize_Nav_Menu_Setting ) ) {
                    $this->update_status = 'error';
                    $this->update_error  = new WP_Error( 'unexpected_nav_menu_setting' );
                    return;
                }

                if ( false === $nav_menu_setting->save() ) {
                    $this->update_status = 'error';
                    $this->update_error  = new WP_Error( 'nav_menu_setting_failure' );
                    return;
                }

                if ( $nav_menu_setting->previous_term_id !== intval( $value['nav_menu_term_id'] ) ) {
                    $this->update_status = 'error';
                    $this->update_error  = new WP_Error( 'unexpected_previous_term_id' );
                    return;
                }

                $value['nav_menu_term_id'] = $nav_menu_setting->term_id;
            }

            // Handle saving a nav menu item that is a child of a nav menu item being newly-created.
            if ( $value['menu_item_parent'] < 0 ) {
                $parent_nav_menu_item_setting_id = sprintf( 'nav_menu_item[%s]', $value['menu_item_parent'] );
                $parent_nav_menu_item_setting    = $this->manager->get_setting( $parent_nav_menu_item_setting_id );

                if ( ! $parent_nav_menu_item_setting || ! ( $parent_nav_menu_item_setting instanceof WP_Customize_Nav_Menu_Item_Setting ) ) {
                    $this->update_status = 'error';
                    $this->update_error  = new WP_Error( 'unexpected_nav_menu_item_setting' );
                    return;
                }

                if ( false === $parent_nav_menu_item_setting->save() ) {
                    $this->update_status = 'error';
                    $this->update_error  = new WP_Error( 'nav_menu_item_setting_failure' );
                    return;
                }

                if ( $parent_nav_menu_item_setting->previous_post_id !== intval( $value['menu_item_parent'] ) ) {
                    $this->update_status = 'error';
                    $this->update_error  = new WP_Error( 'unexpected_previous_post_id' );
                    return;
                }

                $value['menu_item_parent'] = $parent_nav_menu_item_setting->post_id;
            }

            // Insert or update menu.
            $menu_item_data = array(
                'menu-item-object-id'   => $value['object_id'],
                'menu-item-object'      => $value['object'],
                'menu-item-parent-id'   => $value['menu_item_parent'],
                'menu-item-position'    => $value['position'],
                'menu-item-type'        => $value['type'],
                'menu-item-title'       => $value['title'],
                'menu-item-url'         => $value['url'],
                'menu-item-description' => $value['description'],
                'menu-item-attr-title'  => $value['attr_title'],
                'menu-item-target'      => $value['target'],
                'menu-item-classes'     => $value['classes'],
                'menu-item-xfn'         => $value['xfn'],
                'menu-item-status'      => $value['status'],
            );

            $r = wp_update_nav_menu_item(
                $value['nav_menu_term_id'],
                $is_placeholder ? 0 : $this->post_id,
                wp_slash( $menu_item_data )
            );

            if ( is_wp_error( $r ) ) {
                $this->update_status = 'error';
                $this->update_error = $r;
            } else {
                if ( $is_placeholder ) {
                    $this->previous_post_id = $this->post_id;
                    $this->post_id = $r;
                    $this->update_status = 'inserted';
                } else {
                    $this->update_status = 'updated';
                }
            }
        }

    }

    /**
     * Export data for the JS client.
     *
     * @since 4.3.0
     *
     * @see WP_Customize_Nav_Menu_Item_Setting::update()
     *
     * @param array $data Additional information passed back to the 'saved' event on `wp.customize`.
     * @return array Save response data.
     */
    public function amend_customize_save_response( $data ) {
        if ( ! isset( $data['nav_menu_item_updates'] ) ) {
            $data['nav_menu_item_updates'] = array();
        }

        $data['nav_menu_item_updates'][] = array(
            'post_id'          => $this->post_id,
            'previous_post_id' => $this->previous_post_id,
            'error'            => $this->update_error ? $this->update_error->get_error_code() : null,
            'status'           => $this->update_status,
        );
        return $data;
    }
}