plate( $request['id'], $this->post_type );
		$fields_update = $this->update_additional_fields_for_object( $template, $request );
		if ( is_wp_error( $fields_update ) ) {
			return $fields_update;
		}

		$request->set_param( 'context', 'edit' );

		$post = get_post( $template->wp_id );
		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
		do_action( "rest_after_insert_{$this->post_type}", $post, $request, false );

		wp_after_insert_post( $post, $update, $post_before );

		$response = $this->prepare_item_for_response( $template, $request );

		return rest_ensure_response( $response );
	}

	/**
	 * Checks if a given request has access to create a template.
	 *
	 * @since 5.8.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has access to create items, WP_Error object otherwise.
	 */
	public function create_item_permissions_check( $request ) {
		return $this->permissions_check( $request );
	}

	/**
	 * Creates a single template.
	 *
	 * @since 5.8.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function create_item( $request ) {
		$prepared_post = $this->prepare_item_for_database( $request );

		if ( is_wp_error( $prepared_post ) ) {
			return $prepared_post;
		}

		$prepared_post->post_name = $request['slug'];
		$post_id                  = wp_insert_post( wp_slash( (array) $prepared_post ), true );
		if ( is_wp_error( $post_id ) ) {
			if ( 'db_insert_error' === $post_id->get_error_code() ) {
				$post_id->add_data( array( 'status' => 500 ) );
			} else {
				$post_id->add_data( array( 'status' => 400 ) );
			}

			return $post_id;
		}
		$posts = get_block_templates( array( 'wp_id' => $post_id ), $this->post_type );
		if ( ! count( $posts ) ) {
			return new WP_Error( 'rest_template_insert_error', __( 'No templates exist with that id.' ), array( 'status' => 400 ) );
		}
		$id            = $posts[0]->id;
		$post          = get_post( $post_id );
		$template      = get_block_template( $id, $this->post_type );
		$fields_update = $this->update_additional_fields_for_object( $template, $request );
		if ( is_wp_error( $fields_update ) ) {
			return $fields_update;
		}

		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
		do_action( "rest_after_insert_{$this->post_type}", $post, $request, true );

		wp_after_insert_post( $post, false, null );

		$response = $this->prepare_item_for_response( $template, $request );
		$response = rest_ensure_response( $response );

		$response->set_status( 201 );
		$response->header( 'Location', rest_url( sprintf( '%s/%s/%s', $this->namespace, $this->rest_base, $template->id ) ) );

		return $response;
	}

	/**
	 * Checks if a given request has access to delete a single template.
	 *
	 * @since 5.8.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has delete access for the item, WP_Error object otherwise.
	 */
	public function delete_item_permissions_check( $request ) {
		return $this->permissions_check( $request );
	}

	/**
	 * Deletes a single template.
	 *
	 * @since 5.8.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function delete_item( $request ) {
		$template = get_block_template( $request['id'], $this->post_type );
		if ( ! $template ) {
			return new WP_Error( 'rest_template_not_found', __( 'No templates exist with that id.' ), array( 'status' => 404 ) );
		}
		if ( 'custom' !== $template->source ) {
			return new WP_Error( 'rest_invalid_template', __( 'Templates based on theme files can\'t be removed.' ), array( 'status' => 400 ) );
		}

		$id    = $template->wp_id;
		$force = (bool) $request['force'];

		$request->set_param( 'context', 'edit' );

		// If we're forcing, then delete permanently.
		if ( $force ) {
			$previous = $this->prepare_item_for_response( $template, $request );
			$result   = wp_delete_post( $id, true );
			$response = new WP_REST_Response();
			$response->set_data(
				array(
					'deleted'  => true,
					'previous' => $previous->get_data(),
				)
			);
		} else {
			// Otherwise, only trash if we haven't already.
			if ( 'trash' === $template->status ) {
				return new WP_Error(
					'rest_template_already_trashed',
					__( 'The template has already been deleted.' ),
					array( 'status' => 410 )
				);
			}

			/*
			 * (Note that internally this falls through to `wp_delete_post()`
			 * if the Trash is disabled.)
			 */
			$result           = wp_trash_post( $id );
			$template->status = 'trash';
			$response         = $this->prepare_item_for_response( $template, $request );
		}

		if ( ! $result ) {
			return new WP_Error(
				'rest_cannot_delete',
				__( 'The template cannot be deleted.' ),
				array( 'status' => 500 )
			);
		}

		return $response;
	}

	/**
	 * Prepares a single template for create or update.
	 *
	 * @since 5.8.0
	 *
	 * @param WP_REST_Request $request Request object.
	 * @return stdClass|WP_Error Changes to pass to wp_update_post.
	 */
	protected function prepare_item_for_database( $request ) {
		$template = $request['id'] ? get_block_template( $request['id'], $this->post_type ) : null;
		$changes  = new stdClass();
		if ( null === $template ) {
			$changes->post_type   = $this->post_type;
			$changes->post_status = 'publish';
			$changes->tax_input   = array(
				'wp_theme' => isset( $request['theme'] ) ? $request['theme'] : get_stylesheet(),
			);
		} elseif ( 'custom' !== $template->source ) {
			$changes->post_name   = $template->slug;
			$changes->post_type   = $this->post_type;
			$changes->post_status = 'publish';
			$changes->tax_input   = array(
				'wp_theme' => $template->theme,
			);
			$changes->meta_input  = array(
				'origin' => $template->source,
			);
		} else {
			$changes->post_name   = $template->slug;
			$changes->ID          = $template->wp_id;
			$changes->post_status = 'publish';
		}
		if ( isset( $request['content'] ) ) {
			if ( is_string( $request['content'] ) ) {
				$changes->post_content = $request['content'];
			} elseif ( isset( $request['content']['raw'] ) ) {
				$changes->post_content = $request['content']['raw'];
			}
		} elseif ( null !== $template && 'custom' !== $template->source ) {
			$changes->post_content = $template->content;
		}
		if ( isset( $request['title'] ) ) {
			if ( is_string( $request['title'] ) ) {
				$changes->post_title = $request['title'];
			} elseif ( ! empty( $request['title']['raw'] ) ) {
				$changes->post_title = $request['title']['raw'];
			}
		} elseif ( null !== $template && 'custom' !== $template->source ) {
			$changes->post_title = $template->title;
		}
		if ( isset( $request['description'] ) ) {
			$changes->post_excerpt = $request['description'];
		} elseif ( null !== $template && 'custom' !== $template->source ) {
			$changes->post_excerpt = $template->description;
		}

		if ( 'wp_template' === $this->post_type && isset( $request['is_wp_suggestion'] ) ) {
			$changes->meta_input     = wp_parse_args(
				array(
					'is_wp_suggestion' => $request['is_wp_suggestion'],
				),
				$changes->meta_input = array()
			);
		}

		if ( 'wp_template_part' === $this->post_type ) {
			if ( isset( $request['area'] ) ) {
				$changes->tax_input['wp_template_part_area'] = _filter_block_template_part_area( $request['area'] );
			} elseif ( null !== $template && 'custom' !== $template->source && $template->area ) {
				$changes->tax_input['wp_template_part_area'] = _filter_block_template_part_area( $template->area );
			} elseif ( empty( $template->area ) ) {
				$changes->tax_input['wp_template_part_area'] = WP_TEMPLATE_PART_AREA_UNCATEGORIZED;
			}
		}

		if ( ! empty( $request['author'] ) ) {
			$post_author = (int) $request['author'];

			if ( get_current_user_id() !== $post_author ) {
				$user_obj = get_userdata( $post_author );

				if ( ! $user_obj ) {
					return new WP_Error(
						'rest_invalid_author',
						__( 'Invalid author ID.' ),
						array( 'status' => 400 )
					);
				}
			}

			$changes->post_author = $post_author;
		}

		/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
		return apply_filters( "rest_pre_insert_{$this->post_type}", $changes, $request );
	}

	/**
	 * Prepare a single template output for response
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Renamed `$template` to `$item` to match parent class for PHP 8 named parameter support.
	 * @since 6.3.0 Added `modified` property to the response.
	 *
	 * @param WP_Block_Template $item    Template instance.
	 * @param WP_REST_Request   $request Request object.
	 * @return WP_REST_Response Response object.
	 */
	public function prepare_item_for_response( $item, $request ) {
		// Resolve pattern blocks so they don't need to be resolved client-side
		// in the editor, improving performance.
		$blocks        = parse_blocks( $item->content );
		$blocks        = resolve_pattern_blocks( $blocks );
		$item->content = serialize_blocks( $blocks );

		// Restores the more descriptive, specific name for use within this method.
		$template = $item;

		$fields = $this->get_fields_for_response( $request );

		// Base fields for every template.
		$data = array();

		if ( rest_is_field_included( 'id', $fields ) ) {
			$data['id'] = $template->id;
		}

		if ( rest_is_field_included( 'theme', $fields ) ) {
			$data['theme'] = $template->theme;
		}

		if ( rest_is_field_included( 'content', $fields ) ) {
			$data['content'] = array();
		}
		if ( rest_is_field_included( 'content.raw', $fields ) ) {
			$data['content']['raw'] = $template->content;
		}

		if ( rest_is_field_included( 'content.block_version', $fields ) ) {
			$data['content']['block_version'] = block_version( $template->content );
		}

		if ( rest_is_field_included( 'slug', $fields ) ) {
			$data['slug'] = $template->slug;
		}

		if ( rest_is_field_included( 'source', $fields ) ) {
			$data['source'] = $template->source;
		}

		if ( rest_is_field_included( 'origin', $fields ) ) {
			$data['origin'] = $template->origin;
		}

		if ( rest_is_field_included( 'type', $fields ) ) {
			$data['type'] = $template->type;
		}

		if ( rest_is_field_included( 'description', $fields ) ) {
			$data['description'] = $template->description;
		}

		if ( rest_is_field_included( 'title', $fields ) ) {
			$data['title'] = array();
		}

		if ( rest_is_field_included( 'title.raw', $fields ) ) {
			$data['title']['raw'] = $template->title;
		}

		if ( rest_is_field_included( 'title.rendered', $fields ) ) {
			if ( $template->wp_id ) {
				/** This filter is documented in wp-includes/post-template.php */
				$data['title']['rendered'] = apply_filters( 'the_title', $template->title, $template->wp_id );
			} else {
				$data['title']['rendered'] = $template->title;
			}
		}

		if ( rest_is_field_included( 'status', $fields ) ) {
			$data['status'] = $template->status;
		}

		if ( rest_is_field_included( 'wp_id', $fields ) ) {
			$data['wp_id'] = (int) $template->wp_id;
		}

		if ( rest_is_field_included( 'has_theme_file', $fields ) ) {
			$data['has_theme_file'] = (bool) $template->has_theme_file;
		}

		if ( rest_is_field_included( 'is_custom', $fields ) && 'wp_template' === $template->type ) {
			$data['is_custom'] = $template->is_custom;
		}

		if ( rest_is_field_included( 'author', $fields ) ) {
			$data['author'] = (int) $template->author;
		}

		if ( rest_is_field_included( 'area', $fields ) && 'wp_template_part' === $template->type ) {
			$data['area'] = $template->area;
		}

		if ( rest_is_field_included( 'modified', $fields ) ) {
			$data['modified'] = mysql_to_rfc3339( $template->modified );
		}

		if ( rest_is_field_included( 'author_text', $fields ) ) {
			$data['author_text'] = self::get_wp_templates_author_text_field( $template );
		}

		if ( rest_is_field_included( 'original_source', $fields ) ) {
			$data['original_source'] = self::get_wp_templates_original_source_field( $template );
		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );

		// Wrap the data in a response object.
		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
			$links = $this->prepare_links( $template->id );
			$response->add_links( $links );
			if ( ! empty( $links['self']['href'] ) ) {
				$actions = $this->get_available_actions();
				$self    = $links['self']['href'];
				foreach ( $actions as $rel ) {
					$response->add_link( $rel, $self );
				}
			}
		}

		return $response;
	}

	/**
	 * Returns the source from where the template originally comes from.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Block_Template $template_object Template instance.
	 * @return string                            Original source of the template one of theme, plugin, site, or user.
	 */
	private static function get_wp_templates_original_source_field( $template_object ) {
		if ( 'wp_template' === $template_object->type || 'wp_template_part' === $template_object->type ) {
			// Added by theme.
			// Template originally provided by a theme, but customized by a user.
			// Templates originally didn't have the 'origin' field so identify
			// older customized templates by checking for no origin and a 'theme'
			// or 'custom' source.
			if ( $template_object->has_theme_file &&
			( 'theme' === $template_object->origin || (
				empty( $template_object->origin ) && in_array(
					$template_object->source,
					array(
						'theme',
						'custom',
					),
					true
				) )
			)
			) {
				return 'theme';
			}

			// Added by plugin.
			if ( $template_object->has_theme_file && 'plugin' === $template_object->origin ) {
				return 'plugin';
			}

			// Added by site.
			// Template was created from scratch, but has no author. Author support
			// was only added to templates in WordPress 5.9. Fallback to showing the
			// site logo and title.
			if ( empty( $template_object->has_theme_file ) && 'custom' === $template_object->source && empty( $template_object->author ) ) {
				return 'site';
			}
		}

		// Added by user.
		return 'user';
	}

	/**
	 * Returns a human readable text for the author of the template.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Block_Template $template_object Template instance.
	 * @return string                            Human readable text for the author.
	 */
	private static function get_wp_templates_author_text_field( $template_object ) {
		$original_source = self::get_wp_templates_original_source_field( $template_object );
		switch ( $original_source ) {
			case 'theme':
				$theme_name = wp_get_theme( $template_object->theme )->get( 'Name' );
				return empty( $theme_name ) ? $template_object->theme : $theme_name;
			case 'plugin':
				$plugins = get_plugins();
				$plugin  = $plugins[ plugin_basename( sanitize_text_field( $template_object->theme . '.php' ) ) ];
				return empty( $plugin['Name'] ) ? $template_object->theme : $plugin['Name'];
			case 'site':
				return get_bloginfo( 'name' );
			case 'user':
				$author = get_user_by( 'id', $template_object->author );
				if ( ! $author ) {
					return __( 'Unknown author' );
				}
				return $author->get( 'display_name' );
		}
	}


	/**
	 * Prepares links for the request.
	 *
	 * @since 5.8.0
	 *
	 * @param integer $id ID.
	 * @return array Links for the given post.
	 */
	protected function prepare_links( $id ) {
		$links = array(
			'self'       => array(
				'href' => rest_url( sprintf( '/%s/%s/%s', $this->namespace, $this->rest_base, $id ) ),
			),
			'collection' => array(
				'href' => rest_url( rest_get_route_for_post_type_items( $this->post_type ) ),
			),
			'about'      => array(
				'href' => rest_url( 'wp/v2/types/' . $this->post_type ),
			),
		);

		if ( post_type_supports( $this->post_type, 'revisions' ) ) {
			$template = get_block_template( $id, $this->post_type );
			if ( $template instanceof WP_Block_Template && ! empty( $template->wp_id ) ) {
				$revisions       = wp_get_latest_revision_id_and_total_count( $template->wp_id );
				$revisions_count = ! is_wp_error( $revisions ) ? $revisions['count'] : 0;
				$revisions_base  = sprintf( '/%s/%s/%s/revisions', $this->namespace, $this->rest_base, $id );

				$links['version-history'] = array(
					'href'  => rest_url( $revisions_base ),
					'count' => $revisions_count,
				);

				if ( $revisions_count > 0 ) {
					$links['predecessor-version'] = array(
						'href' => rest_url( $revisions_base . '/' . $revisions['latest_id'] ),
						'id'   => $revisions['latest_id'],
					);
				}
			}
		}

		return $links;
	}

	/**
	 * Get the link relations available for the post and current user.
	 *
	 * @since 5.8.0
	 *
	 * @return string[] List of link relations.
	 */
	protected function get_available_actions() {
		$rels = array();

		$post_type = get_post_type_object( $this->post_type );

		if ( current_user_can( $post_type->cap->publish_posts ) ) {
			$rels[] = 'https://api.w.org/action-publish';
		}

		if ( current_user_can( 'unfiltered_html' ) ) {
			$rels[] = 'https://api.w.org/action-unfiltered-html';
		}

		return $rels;
	}

	/**
	 * Retrieves the query params for the posts collection.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added `'area'` and `'post_type'`.
	 *
	 * @return array Collection parameters.
	 */
	public function get_collection_params() {
		return array(
			'context'   => $this->get_context_param( array( 'default' => 'view' ) ),
			'wp_id'     => array(
				'description' => __( 'Limit to the specified post id.' ),
				'type'        => 'integer',
			),
			'area'      => array(
				'description' => __( 'Limit to the specified template part area.' ),
				'type'        => 'string',
			),
			'post_type' => array(
				'description' => __( 'Post type to get the templates for.' ),
				'type'        => 'string',
			),
		);
	}

	/**
	 * Retrieves the block type' schema, conforming to JSON Schema.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added `'area'`.
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this->schema ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => $this->post_type,
			'type'       => 'object',
			'properties' => array(
				'id'              => array(
					'description' => __( 'ID of template.' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'slug'            => array(
					'description' => __( 'Unique slug identifying the template.' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
					'required'    => true,
					'minLength'   => 1,
					'pattern'     => '[a-zA-Z0-9_\%-]+',
				),
				'theme'           => array(
					'description' => __( 'Theme identifier for the template.' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
				),
				'type'            => array(
					'description' => __( 'Type of template.' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
				),
				'source'          => array(
					'description' => __( 'Source of template' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'origin'          => array(
					'description' => __( 'Source of a customized template' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'content'         => array(
					'description' => __( 'Content of template.' ),
					'type'        => array( 'object', 'string' ),
					'default'     => '',
					'context'     => array( 'embed', 'view', 'edit' ),
					'properties'  => array(
						'raw'           => array(
							'description' => __( 'Content for the template, as it exists in the database.' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit' ),
						),
						'block_version' => array(
							'description' => __( 'Version of the content block format used by the template.' ),
							'type'        => 'integer',
							'context'     => array( 'edit' ),
							'readonly'    => true,
						),
					),
				),
				'title'           => array(
					'description' => __( 'Title of template.' ),
					'type'        => array( 'object', 'string' ),
					'default'     => '',
					'context'     => array( 'embed', 'view', 'edit' ),
					'properties'  => array(
						'raw'      => array(
							'description' => __( 'Title for the template, as it exists in the database.' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit', 'embed' ),
						),
						'rendered' => array(
							'description' => __( 'HTML title for the template, transformed for display.' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit', 'embed' ),
							'readonly'    => true,
						),
					),
				),
				'description'     => array(
					'description' => __( 'Description of template.' ),
					'type'        => 'string',
					'default'     => '',
					'context'     => array( 'embed', 'view', 'edit' ),
				),
				'status'          => array(
					'description' => __( 'Status of template.' ),
					'type'        => 'string',
					'enum'        => array_keys( get_post_stati( array( 'internal' => false ) ) ),
					'default'     => 'publish',
					'context'     => array( 'embed', 'view', 'edit' ),
				),
				'wp_id'           => array(
					'description' => __( 'Post ID.' ),
					'type'        => 'integer',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'has_theme_file'  => array(
					'description' => __( 'Theme file exists.' ),
					'type'        => 'bool',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'author'          => array(
					'description' => __( 'The ID for the author of the template.' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'modified'        => array(
					'description' => __( "The date the template was last modified, in the site's timezone." ),
					'type'        => 'string',
					'format'      => 'date-time',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'author_text'     => array(
					'type'        => 'string',
					'description' => __( 'Human readable text for the author.' ),
					'readonly'    => true,
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'original_source' => array(
					'description' => __( 'Where the template originally comes from e.g. \'theme\'' ),
					'type'        => 'string',
					'readonly'    => true,
					'context'     => array( 'view', 'edit', 'embed' ),
					'enum'        => array(
						'theme',
						'plugin',
						'site',
						'user',
					),
				),
			),
		);

		if ( 'wp_template' === $this->post_type ) {
			$schema['properties']['is_custom'] = array(
				'description' => __( 'Whether a template is a custom template.' ),
				'type'        => 'bool',
				'context'     => array( 'embed', 'view', 'edit' ),
				'readonly'    => true,
			);
		}

		if ( 'wp_template_part' === $this->post_type ) {
			$schema['properties']['area'] = array(
				'description' => __( 'Where the template part is intended for use (header, footer, etc.)' ),
				'type'        => 'string',
				'context'     => array( 'embed', 'view', 'edit' ),
			);
		}

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}
}
     extract_prefix_and_suffix( 'data-wp-bind--src' )     => array( 'data-wp-bind', 'src' )
	 *     extract_prefix_and_suffix( 'data-wp-foo--and--bar' ) => array( 'data-wp-foo', 'and--bar' )
	 *
	 * @since 6.5.0
	 *
	 * @param string $directive_name The directive attribute name.
	 * @return array An array containing the directive prefix and optional suffix.
	 */
	private function extract_prefix_and_suffix( string $directive_name ): array {
		return explode( '--', $directive_name, 2 );
	}

	/**
	 * Parses and extracts the namespace and reference path from the given
	 * directive attribute value.
	 *
	 * If the value doesn't contain an explicit namespace, it returns the
	 * default one. If the value contains a JSON object instead of a reference
	 * path, the function tries to parse it and return the resulting array. If
	 * the value contains strings that represent booleans ("true" and "false"),
	 * numbers ("1" and "1.2") or "null", the function also transform them to
	 * regular booleans, numbers and `null`.
	 *
	 * Example:
	 *
	 *     extract_directive_value( 'actions.foo', 'myPlugin' )                      => array( 'myPlugin', 'actions.foo' )
	 *     extract_directive_value( 'otherPlugin::actions.foo', 'myPlugin' )         => array( 'otherPlugin', 'actions.foo' )
	 *     extract_directive_value( '{ "isOpen": false }', 'myPlugin' )              => array( 'myPlugin', array( 'isOpen' => false ) )
	 *     extract_directive_value( 'otherPlugin::{ "isOpen": false }', 'myPlugin' ) => array( 'otherPlugin', array( 'isOpen' => false ) )
	 *
	 * @since 6.5.0
	 *
	 * @param string|true $directive_value   The directive attribute value. It can be `true` when it's a boolean
	 *                                       attribute.
	 * @param string|null $default_namespace Optional. The default namespace if none is explicitly defined.
	 * @return array An array containing the namespace in the first item and the JSON, the reference path, or null on the
	 *               second item.
	 */
	private function extract_directive_value( $directive_value, $default_namespace = null ): array {
		if ( empty( $directive_value ) || is_bool( $directive_value ) ) {
			return array( $default_namespace, null );
		}

		// Replaces the value and namespace if there is a namespace in the value.
		if ( 1 === preg_match( '/^([\w\-_\/]+)::./', $directive_value ) ) {
			list($default_namespace, $directive_value) = explode( '::', $directive_value, 2 );
		}

		/*
		 * Tries to decode the value as a JSON object. If it fails and the value
		 * isn't `null`, it returns the value as it is. Otherwise, it returns the
		 * decoded JSON or null for the string `null`.
		 */
		$decoded_json = json_decode( $directive_value, true );
		if ( null !== $decoded_json || 'null' === $directive_value ) {
			$directive_value = $decoded_json;
		}

		return array( $default_namespace, $directive_value );
	}

	/**
	 * Transforms a kebab-case string to camelCase.
	 *
	 * @param string $str The kebab-case string to transform to camelCase.
	 * @return string The transformed camelCase string.
	 */
	private function kebab_to_camel_case( string $str ): string {
		return lcfirst(
			preg_replace_callback(
				'/(-)([a-z])/',
				function ( $matches ) {
					return strtoupper( $matches[2] );
				},
				strtolower( rtrim( $str, '-' ) )
			)
		);
	}

	/**
	 * Processes the `data-wp-interactive` directive.
	 *
	 * It adds the default store namespace defined in the directive value to the
	 * stack so that it's available for the nested interactivity elements.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p    The directives processor instance.
	 * @param string                                    $mode Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_interactive_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		// When exiting tags, it removes the last namespace from the stack.
		if ( 'exit' === $mode ) {
			array_pop( $this->namespace_stack );
			return;
		}

		// Tries to decode the `data-wp-interactive` attribute value.
		$attribute_value = $p->get_attribute( 'data-wp-interactive' );

		/*
		 * Pushes the newly defined namespace or the current one if the
		 * `data-wp-interactive` definition was invalid or does not contain a
		 * namespace. It does so because the function pops out the current namespace
		 * from the stack whenever it finds a `data-wp-interactive`'s closing tag,
		 * independently of whether the previous `data-wp-interactive` definition
		 * contained a valid namespace.
		 */
		$new_namespace = null;
		if ( is_string( $attribute_value ) && ! empty( $attribute_value ) ) {
			$decoded_json = json_decode( $attribute_value, true );
			if ( is_array( $decoded_json ) ) {
				$new_namespace = $decoded_json['namespace'] ?? null;
			} else {
				$new_namespace = $attribute_value;
			}
		}
		$this->namespace_stack[] = ( $new_namespace && 1 === preg_match( '/^([\w\-_\/]+)/', $new_namespace ) )
			? $new_namespace
			: end( $this->namespace_stack );
	}

	/**
	 * Processes the `data-wp-context` directive.
	 *
	 * It adds the context defined in the directive value to the stack so that
	 * it's available for the nested interactivity elements.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_context_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		// When exiting tags, it removes the last context from the stack.
		if ( 'exit' === $mode ) {
			array_pop( $this->context_stack );
			return;
		}

		$attribute_value = $p->get_attribute( 'data-wp-context' );
		$namespace_value = end( $this->namespace_stack );

		// Separates the namespace from the context JSON object.
		list( $namespace_value, $decoded_json ) = is_string( $attribute_value ) && ! empty( $attribute_value )
			? $this->extract_directive_value( $attribute_value, $namespace_value )
			: array( $namespace_value, null );

		/*
		 * If there is a namespace, it adds a new context to the stack merging the
		 * previous context with the new one.
		 */
		if ( is_string( $namespace_value ) ) {
			$this->context_stack[] = array_replace_recursive(
				end( $this->context_stack ) !== false ? end( $this->context_stack ) : array(),
				array( $namespace_value => is_array( $decoded_json ) ? $decoded_json : array() )
			);
		} else {
			/*
			 * If there is no namespace, it pushes the current context to the stack.
			 * It needs to do so because the function pops out the current context
			 * from the stack whenever it finds a `data-wp-context`'s closing tag.
			 */
			$this->context_stack[] = end( $this->context_stack );
		}
	}

	/**
	 * Processes the `data-wp-bind` directive.
	 *
	 * It updates or removes the bound attributes based on the evaluation of its
	 * associated reference.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_bind_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode ) {
			$all_bind_directives = $p->get_attribute_names_with_prefix( 'data-wp-bind--' );

			foreach ( $all_bind_directives as $attribute_name ) {
				list( , $bound_attribute ) = $this->extract_prefix_and_suffix( $attribute_name );
				if ( empty( $bound_attribute ) ) {
					return;
				}

				$attribute_value = $p->get_attribute( $attribute_name );
				$result          = $this->evaluate( $attribute_value );

				if (
					null !== $result &&
					(
						false !== $result ||
						( strlen( $bound_attribute ) > 5 && '-' === $bound_attribute[4] )
					)
				) {
					/*
					 * If the result of the evaluation is a boolean and the attribute is
					 * `aria-` or `data-, convert it to a string "true" or "false". It
					 * follows the exact same logic as Preact because it needs to
					 * replicate what Preact will later do in the client:
					 * https://github.com/preactjs/preact/blob/ea49f7a0f9d1ff2c98c0bdd66aa0cbc583055246/src/diff/props.js#L131C24-L136
					 */
					if (
						is_bool( $result ) &&
						( strlen( $bound_attribute ) > 5 && '-' === $bound_attribute[4] )
					) {
						$result = $result ? 'true' : 'false';
					}
					$p->set_attribute( $bound_attribute, $result );
				} else {
					$p->remove_attribute( $bound_attribute );
				}
			}
		}
	}

	/**
	 * Processes the `data-wp-class` directive.
	 *
	 * It adds or removes CSS classes in the current HTML element based on the
	 * evaluation of its associated references.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_class_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode ) {
			$all_class_directives = $p->get_attribute_names_with_prefix( 'data-wp-class--' );

			foreach ( $all_class_directives as $attribute_name ) {
				list( , $class_name ) = $this->extract_prefix_and_suffix( $attribute_name );
				if ( empty( $class_name ) ) {
					return;
				}

				$attribute_value = $p->get_attribute( $attribute_name );
				$result          = $this->evaluate( $attribute_value );

				if ( $result ) {
					$p->add_class( $class_name );
				} else {
					$p->remove_class( $class_name );
				}
			}
		}
	}

	/**
	 * Processes the `data-wp-style` directive.
	 *
	 * It updates the style attribute value of the current HTML element based on
	 * the evaluation of its associated references.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_style_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode ) {
			$all_style_attributes = $p->get_attribute_names_with_prefix( 'data-wp-style--' );

			foreach ( $all_style_attributes as $attribute_name ) {
				list( , $style_property ) = $this->extract_prefix_and_suffix( $attribute_name );
				if ( empty( $style_property ) ) {
					continue;
				}

				$directive_attribute_value = $p->get_attribute( $attribute_name );
				$style_property_value      = $this->evaluate( $directive_attribute_value );
				$style_attribute_value     = $p->get_attribute( 'style' );
				$style_attribute_value     = ( $style_attribute_value && ! is_bool( $style_attribute_value ) ) ? $style_attribute_value : '';

				/*
				 * Checks first if the style property is not falsy and the style
				 * attribute value is not empty because if it is, it doesn't need to
				 * update the attribute value.
				 */
				if ( $style_property_value || $style_attribute_value ) {
					$style_attribute_value = $this->merge_style_property( $style_attribute_value, $style_property, $style_property_value );
					/*
					 * If the style attribute value is not empty, it sets it. Otherwise,
					 * it removes it.
					 */
					if ( ! empty( $style_attribute_value ) ) {
						$p->set_attribute( 'style', $style_attribute_value );
					} else {
						$p->remove_attribute( 'style' );
					}
				}
			}
		}
	}

	/**
	 * Merges an individual style property in the `style` attribute of an HTML
	 * element, updating or removing the property when necessary.
	 *
	 * If a property is modified, the old one is removed and the new one is added
	 * at the end of the list.
	 *
	 * @since 6.5.0
	 *
	 * Example:
	 *
	 *     merge_style_property( 'color:green;', 'color', 'red' )      => 'color:red;'
	 *     merge_style_property( 'background:green;', 'color', 'red' ) => 'background:green;color:red;'
	 *     merge_style_property( 'color:green;', 'color', null )       => ''
	 *
	 * @param string            $style_attribute_value The current style attribute value.
	 * @param string            $style_property_name   The style property name to set.
	 * @param string|false|null $style_property_value  The value to set for the style property. With false, null or an
	 *                                                 empty string, it removes the style property.
	 * @return string The new style attribute value after the specified property has been added, updated or removed.
	 */
	private function merge_style_property( string $style_attribute_value, string $style_property_name, $style_property_value ): string {
		$style_assignments    = explode( ';', $style_attribute_value );
		$result               = array();
		$style_property_value = ! empty( $style_property_value ) ? rtrim( trim( $style_property_value ), ';' ) : null;
		$new_style_property   = $style_property_value ? $style_property_name . ':' . $style_property_value . ';' : '';

		// Generates an array with all the properties but the modified one.
		foreach ( $style_assignments as $style_assignment ) {
			if ( empty( trim( $style_assignment ) ) ) {
				continue;
			}
			list( $name, $value ) = explode( ':', $style_assignment );
			if ( trim( $name ) !== $style_property_name ) {
				$result[] = trim( $name ) . ':' . trim( $value ) . ';';
			}
		}

		// Adds the new/modified property at the end of the list.
		$result[] = $new_style_property;

		return implode( '', $result );
	}

	/**
	 * Processes the `data-wp-text` directive.
	 *
	 * It updates the inner content of the current HTML element based on the
	 * evaluation of its associated reference.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_text_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode ) {
			$attribute_value = $p->get_attribute( 'data-wp-text' );
			$result          = $this->evaluate( $attribute_value );

			/*
			 * Follows the same logic as Preact in the client and only changes the
			 * content if the value is a string or a number. Otherwise, it removes the
			 * content.
			 */
			if ( is_string( $result ) || is_numeric( $result ) ) {
				$p->set_content_between_balanced_tags( esc_html( $result ) );
			} else {
				$p->set_content_between_balanced_tags( '' );
			}
		}
	}

	/**
	 * Returns the CSS styles for animating the top loading bar in the router.
	 *
	 * @since 6.5.0
	 *
	 * @return string The CSS styles for the router's top loading bar animation.
	 */
	private function get_router_animation_styles(): string {
		return <<<CSS
			.wp-interactivity-router-loading-bar {
				position: fixed;
				top: 0;
				left: 0;
				margin: 0;
				padding: 0;
				width: 100vw;
				max-width: 100vw !important;
				height: 4px;
				background-color: #000;
				opacity: 0
			}
			.wp-interactivity-router-loading-bar.start-animation {
				animation: wp-interactivity-router-loading-bar-start-animation 30s cubic-bezier(0.03, 0.5, 0, 1) forwards
			}
			.wp-interactivity-router-loading-bar.finish-animation {
				animation: wp-interactivity-router-loading-bar-finish-animation 300ms ease-in
			}
			@keyframes wp-interactivity-router-loading-bar-start-animation {
				0% { transform: scaleX(0); transform-origin: 0 0; opacity: 1 }
				100% { transform: scaleX(1); transform-origin: 0 0; opacity: 1 }
			}
			@keyframes wp-interactivity-router-loading-bar-finish-animation {
				0% { opacity: 1 }
				50% { opacity: 1 }
				100% { opacity: 0 }
			}
CSS;
	}

	/**
	 * Outputs the markup for the top loading indicator and the screen reader
	 * notifications during client-side navigations.
	 *
	 * This method prints a div element representing a loading bar visible during
	 * navigation, as well as an aria-live region that can be read by screen
	 * readers to announce navigation status.
	 *
	 * @since 6.5.0
	 */
	public function print_router_loading_and_screen_reader_markup() {
		echo <<<HTML
			<div
				class="wp-interactivity-router-loading-bar"
				data-wp-interactive="core/router"
				data-wp-class--start-animation="state.navigation.hasStarted"
				data-wp-class--finish-animation="state.navigation.hasFinished"
			></div>
			<div
				class="screen-reader-text"
				aria-live="polite"
				data-wp-interactive="core/router"
				data-wp-text="state.navigation.message"
			></div>
HTML;
	}

	/**
	 * Processes the `data-wp-router-region` directive.
	 *
	 * It renders in the footer a set of HTML elements to notify users about
	 * client-side navigations. More concretely, the elements added are 1) a
	 * top loading bar to visually inform that a navigation is in progress
	 * and 2) an `aria-live` region for accessible navigation announcements.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_router_region_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode && ! $this->has_processed_router_region ) {
			$this->has_processed_router_region = true;

			// Initialize the `core/router` store.
			$this->state(
				'core/router',
				array(
					'navigation' => array(
						'texts' => array(
							'loading' => __( 'Loading page, please wait.' ),
							'loaded'  => __( 'Page Loaded.' ),
						),
					),
				)
			);

			// Enqueues as an inline style.
			wp_register_style( 'wp-interactivity-router-animations', false );
			wp_add_inline_style( 'wp-interactivity-router-animations', $this->get_router_animation_styles() );
			wp_enqueue_style( 'wp-interactivity-router-animations' );

			// Adds the necessary markup to the footer.
			add_action( 'wp_footer', array( $this, 'print_router_loading_and_screen_reader_markup' ) );
		}
	}

	/**
	 * Processes the `data-wp-each` directive.
	 *
	 * This directive gets an array passed as reference and iterates over it
	 * generating new content for each item based on the inner markup of the
	 * `template` tag.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 * @param array                                     $tag_stack       The reference to the tag stack.
	 */
	private function data_wp_each_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$tag_stack ) {
		if ( 'enter' === $mode && 'TEMPLATE' === $p->get_tag() ) {
			$attribute_name   = $p->get_attribute_names_with_prefix( 'data-wp-each' )[0];
			$extracted_suffix = $this->extract_prefix_and_suffix( $attribute_name );
			$item_name        = isset( $extracted_suffix[1] ) ? $this->kebab_to_camel_case( $extracted_suffix[1] ) : 'item';
			$attribute_value  = $p->get_attribute( $attribute_name );
			$result           = $this->evaluate( $attribute_value );

			// Gets the content between the template tags and leaves the cursor in the closer tag.
			$inner_content = $p->get_content_between_balanced_template_tags();

			// Checks if there is a manual server-side directive processing.
			$template_end = 'data-wp-each: template end';
			$p->set_bookmark( $template_end );
			$p->next_tag();
			$manual_sdp = $p->get_attribute( 'data-wp-each-child' );
			$p->seek( $template_end ); // Rewinds to the template closer tag.
			$p->release_bookmark( $template_end );

			/*
			 * It doesn't process in these situations:
			 * - Manual server-side directive processing.
			 * - Empty or non-array values.
			 * - Associative arrays because those are deserialized as objects in JS.
			 * - Templates that contain top-level texts because those texts can't be
			 *   identified and removed in the client.
			 */
			if (
				$manual_sdp ||
				empty( $result ) ||
				! is_array( $result ) ||
				! array_is_list( $result ) ||
				! str_starts_with( trim( $inner_content ), '<' ) ||
				! str_ends_with( trim( $inner_content ), '>' )
			) {
				array_pop( $tag_stack );
				return;
			}

			// Extracts the namespace from the directive attribute value.
			$namespace_value         = end( $this->namespace_stack );
			list( $namespace_value ) = is_string( $attribute_value ) && ! empty( $attribute_value )
				? $this->extract_directive_value( $attribute_value, $namespace_value )
				: array( $namespace_value, null );

			// Processes the inner content for each item of the array.
			$processed_content = '';
			foreach ( $result as $item ) {
				// Creates a new context that includes the current item of the array.
				$this->context_stack[] = array_replace_recursive(
					end( $this->context_stack ) !== false ? end( $this->context_stack ) : array(),
					array( $namespace_value => array( $item_name => $item ) )
				);

				// Processes the inner content with the new context.
				$processed_item = $this->_process_directives( $inner_content );

				if ( null === $processed_item ) {
					// If the HTML is unbalanced, stop processing it.
					array_pop( $this->context_stack );
					return;
				}

				// Adds the `data-wp-each-child` to each top-level tag.
				$i = new WP_Interactivity_API_Directives_Processor( $processed_item );
				while ( $i->next_tag() ) {
					$i->set_attribute( 'data-wp-each-child', true );
					$i->next_balanced_tag_closer_tag();
				}
				$processed_content .= $i->get_updated_html();

				// Removes the current context from the stack.
				array_pop( $this->context_stack );
			}

			// Appends the processed content after the tag closer of the template.
			$p->append_content_after_template_tag_closer( $processed_content );

			// Pops the last tag because it skipped the closing tag of the template tag.
			array_pop( $tag_stack );
		}
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WP_Interactivity_API' not found in /home/ocb/public_html/wp-includes/interactivity-api/interactivity-api.php:25
Stack trace:
#0 /home/ocb/public_html/wp-settings.php(405): wp_interactivity()
#1 /home/ocb/public_html/wp-config.php(77): require_once('/home/ocb/publi...')
#2 /home/ocb/public_html/wp-load.php(50): require_once('/home/ocb/publi...')
#3 /home/ocb/public_html/wp-blog-header.php(13): require_once('/home/ocb/publi...')
#4 /home/ocb/public_html/index.php(17): require('/home/ocb/publi...')
#5 {main}
  thrown in <b>/home/ocb/public_html/wp-includes/interactivity-api/interactivity-api.php</b> on line <b>25</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/ocb/public_html/wp-includes/l10n.php:856
Stack trace:
#0 /home/ocb/public_html/wp-includes/l10n.php(959): load_textdomain('default', '/home/ocb/publi...', 'lv')
#1 /home/ocb/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/ocb/public_html/wp-includes/l10n.php</b> on line <b>856</b><br />