WP_Sitemaps_Stylesheet

17#[AllowDynamicProperties]18class WP_Sitemaps_Stylesheet {19	/**20	 * Renders the XSL stylesheet depending on whether it's the sitemap index or not.21	 *22	 * @param string $type Stylesheet type. Either 'sitemap' or 'index'.23	 */24	public function render_stylesheet( $type ) {25		header( 'Content-Type: application/xml; charset=UTF-8' );26 27		if ( 'sitemap' === $type ) {28			// All content is escaped below.29			echo $this->get_sitemap_stylesheet();30		}31 32		if ( 'index' === $type ) {33			// All content is escaped below.34			echo $this->get_sitemap_index_stylesheet();35		}36 37		exit;38	}39 40	/**41	 * Returns the escaped XSL for all sitemaps, except index.42	 *43	 * @since 5.5.044	 */45	public function get_sitemap_stylesheet() {46		$css         = $this->get_stylesheet_css();47		$title       = esc_xml( __( 'XML Sitemap' ) );48		$description = esc_xml( __( 'This XML Sitemap is generated by WordPress to make your content more visible for search engines.' ) );49		$learn_more  = sprintf(50			'<a href="%s">%s</a>',51			esc_url( __( 'https://www.sitemaps.org/' ) ),52			esc_xml( __( 'Learn more about XML sitemaps.' ) )53		);54 55		$text = sprintf(56			/* translators: %s: Number of URLs. */57			esc_xml( __( 'Number of URLs in this XML Sitemap: %s.' ) ),58			'<xsl:value-of select="count( sitemap:urlset/sitemap:url )" />'59		);60 61		$lang       = get_language_attributes( 'html' );62		$url        = esc_xml( __( 'URL' ) );63		$lastmod    = esc_xml( __( 'Last Modified' ) );64		$changefreq = esc_xml( __( 'Change Frequency' ) );65		$priority   = esc_xml( __( 'Priority' ) );66 67		$xsl_content = <<<XSL68<?xml version="1.0" encoding="UTF-8"?>69<xsl:stylesheet70		version="1.0"71		xmlns:xsl="http://www.w3.org/1999/XSL/Transform"72		xmlns:sitemap="http://www.sitemaps.org/schemas/sitemap/0.9"73		exclude-result-prefixes="sitemap"74		>75 76	<xsl:output method="html" encoding="UTF-8" indent="yes" />77 78	<!--79	  Set variables for whether lastmod, changefreq or priority occur for any url in the sitemap.80	  We do this up front because it can be expensive in a large sitemap.81	  -->82	<xsl:variable name="has-lastmod"    select="count( /sitemap:urlset/sitemap:url/sitemap:lastmod )"    />83	<xsl:variable name="has-changefreq" select="count( /sitemap:urlset/sitemap:url/sitemap:changefreq )" />84	<xsl:variable name="has-priority"   select="count( /sitemap:urlset/sitemap:url/sitemap:priority )"   />85 86	<xsl:template match="/">87		<html {$lang}>88			<head>89				<title>{$title}</title>90				<style>91					{$css}92				</style>93			</head>94			<body>95				<div id="sitemap">96					<div id="sitemap__header">