<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
* Sitemaps (per the protocol) are essentially lists of XML fragments;
* lists which are subject to size constraints. The Jetpack_Sitemap_Buffer
* class abstracts the details of constructing these lists while
* maintaining the constraints.
* @package automattic/jetpack
if ( ! defined( 'ABSPATH' ) ) {
* A buffer for constructing sitemap xml files.
* Models a list of strings such that
* 1. the list must have a bounded number of entries,
* 2. the concatenation of the strings must have bounded
* length (including some header and footer strings), and
* 3. each item has a timestamp, and we need to keep track
* of the most recent timestamp of the items in the list.
abstract class Jetpack_Sitemap_Buffer {
* Largest number of items the buffer can hold.
* @var int $item_capacity The item capacity.
protected $item_capacity;
* Largest number of bytes the buffer can hold.
* @var int $byte_capacity The byte capacity.
protected $byte_capacity;
* Flag which detects when the buffer is full.
* @var bool $is_full_flag The flag value. This flag is set to false on construction and only flipped to true if we've tried to add something and failed.
* Flag which detects when the buffer is empty.
* @var bool $is_empty_flag The flag value. This flag is set to true on construction and only flipped to false if we've tried to add something and succeeded.
protected $is_empty_flag;
* The most recent timestamp seen by the buffer.
* @var string $timestamp Must be in 'YYYY-MM-DD hh:mm:ss' format.
* The DOM document object that is currently being used to construct the XML doc.
* The root DOM element object that holds everything inside. Do not use directly, call
* the get_root_element getter method instead.
* Helper class to construct sitemap paths.
* @var Jetpack_Sitemap_Finder
* Construct a new Jetpack_Sitemap_Buffer.
* @param int $item_limit The maximum size of the buffer in items.
* @param int $byte_limit The maximum size of the buffer in bytes.
* @param string $time The initial datetime of the buffer. Must be in 'YYYY-MM-DD hh:mm:ss' format.
public function __construct( $item_limit, $byte_limit, $time ) {
$this->is_full_flag = false;
$this->timestamp = $time;
$this->finder = new Jetpack_Sitemap_Finder();
$this->doc = new DOMDocument( '1.0', 'UTF-8' );
$this->doc->formatOutput = true;
$this->doc->preserveWhiteSpace = false;
$this->item_capacity = max( 1, (int) $item_limit );
$this->byte_capacity = max( 1, (int) $byte_limit ) - strlen( $this->doc->saveXML() );
* Returns a DOM element that contains all sitemap elements.
* @return DOMElement $root
abstract protected function get_root_element();
* Append an item to the buffer, if there is room for it,
* and set is_empty_flag to false. If there is no room,
* we set is_full_flag to true. If $item is null,
* don't do anything and report success.
* @param array $array The item to be added.
* @return bool True if the append succeeded, False if not.
public function append( $array ) {
if ( $this->is_full_flag ) {
if ( 0 >= $this->item_capacity || 0 >= $this->byte_capacity ) {
$this->is_full_flag = true;
$this->item_capacity -= 1;
$added_element = $this->array_to_xml_string( $array, $this->get_root_element(), $this->doc );
$this->byte_capacity -= strlen( $this->doc->saveXML( $added_element ) );
* Retrieve the contents of the buffer.
* @return string The contents of the buffer (with the footer included).
public function contents() {
if ( $this->is_empty() ) {
// The sitemap should have at least the root element added to the DOM.
$this->get_root_element();
return $this->doc->saveXML();
* Retrieve the document object.
* @return DOMDocument $doc
public function get_document() {
* Detect whether the buffer is full.
* @return bool True if the buffer is full, false otherwise.
public function is_full() {
return $this->is_full_flag;
* Detect whether the buffer is empty.
* @return bool True if the buffer is empty, false otherwise.
public function is_empty() {
|| ! $this->root->hasChildNodes()
* Update the timestamp of the buffer.
* @param string $new_time A datetime string in 'YYYY-MM-DD hh:mm:ss' format.
public function view_time( $new_time ) {
$this->timestamp = max( $this->timestamp, $new_time );
* Retrieve the timestamp of the buffer.
* @return string A datetime string in 'YYYY-MM-DD hh:mm:ss' format.
public function last_modified() {
* Render an associative array as an XML string. This is needed because
* SimpleXMLElement only handles valid XML, but we sometimes want to
* pass around (possibly invalid) fragments. Note that 'null' values make
* a tag self-closing; this is only sometimes correct (depending on the
* version of HTML/XML); see the list of 'void tags'.
* 'html' => array( |<html xmlns="foo">
* 'head' => array( | <head>
* 'title' => 'Woo!', | <title>Woo!</title>
* 'body' => array( ==> | <body>
* 'h2' => 'Some thing', | <h2>Some thing</h2>
* 'p' => 'it's all up ons', | <p>it's all up ons</p>
* @since 4.8.0 Rename, add $depth parameter, and change return type.
* @since 5.3.0 Refactor, remove $depth parameter, add $parent and $root, make access protected.
* @param array $array A recursive associative array of tag/child relationships.
* @param DOMElement $parent (optional) an element to which new children should be added.
* @param DOMDocument $root (optional) the parent document.
* @return string|DOMDocument The rendered XML string or an object if root element is specified.
protected function array_to_xml_string( $array, $parent = null, $root = null ) {
if ( null === $parent ) {
$root = new DOMDocument();
if ( is_array( $array ) ) {
foreach ( $array as $key => $value ) {
$element = $root->createElement( $key );
$parent->appendChild( $element );
if ( is_array( $value ) ) {
foreach ( $value as $child_key => $child_value ) {
$child = $root->createElement( $child_key );
$element->appendChild( $child );
$child->appendChild( self::array_to_xml_string( $child_value, $child, $root ) );
$root->createTextNode( $value )
$element = $root->createTextNode( $array );
$parent->appendChild( $element );
return $root->saveHTML();
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