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/**
 * Sitemaps: WP_Sitemaps_Stylesheet class
 *
 * This class provides the XSL stylesheets to style all sitemaps.
 *
 * @package WordPress
 * @subpackage Sitemaps
 * @since 5.5.0
 */

/**
 * Stylesheet provider class.
 *
 * @since 5.5.0
 */
#[AllowDynamicProperties]
class WP_Sitemaps_Stylesheet {
	/**
	 * Renders the XSL stylesheet depending on whether it's the sitemap index or not.
	 *
	 * @param string $type Stylesheet type. Either 'sitemap' or 'index'.
	 */
	public function render_stylesheet( $type ) {
		header( 'Content-Type: application/xml; charset=UTF-8' );

		if ( 'sitemap' === $type ) {
			// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- All content escaped below.
			echo $this-&gt;get_sitemap_stylesheet();
		}

		if ( 'index' === $type ) {
			// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- All content escaped below.
			echo $this-&gt;get_sitemap_index_stylesheet();
		}

		exit;
	}

	/**
	 * Returns the escaped XSL for all sitemaps, except index.
	 *
	 * @since 5.5.0
	 */
	public function get_sitemap_stylesheet() {
		$css         = $this-&gt;get_stylesheet_css();
		$title       = esc_xml( __( 'XML Sitemap' ) );
		$description = esc_xml( __( 'This XML Sitemap is generated by WordPress to make your content more visible for search engines.' ) );
		$learn_more  = sprintf(
			'&lt;a href=&quot;%s&quot;&gt;%s&lt;/a&gt;',
			esc_url( __( 'https://www.sitemaps.org/' ) ),
			esc_xml( __( 'Learn more about XML sitemaps.' ) )
		);

		$text = sprintf(
			/* translators: %s: Number of URLs. */
			esc_xml( __( 'Number of URLs in this XML Sitemap: %s.' ) ),
			'&lt;xsl:value-of select=&quot;count( sitemap:urlset/sitemap:url )&quot; /&gt;'
		);

		$lang       = get_language_attributes( 'html' );
		$url        = esc_xml( __( 'URL' ) );
		$lastmod    = esc_xml( __( 'Last Modified' ) );
		$changefreq = esc_xml( __( 'Change Frequency' ) );
		$priority   = esc_xml( __( 'Priority' ) );

		$xsl_content = &lt;&lt;&lt;XSL
&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;xsl:stylesheet
		version=&quot;1.0&quot;
		xmlns:xsl=&quot;http://www.w3.org/1999/XSL/Transform&quot;
		xmlns:sitemap=&quot;http://www.sitemaps.org/schemas/sitemap/0.9&quot;
		exclude-result-prefixes=&quot;sitemap&quot;
		&gt;

	&lt;xsl:output method=&quot;html&quot; encoding=&quot;UTF-8&quot; indent=&quot;yes&quot; /&gt;

	&lt;!--
	  Set variables for whether lastmod, changefreq or priority occur for any url in the sitemap.
	  We do this up front because it can be expensive in a large sitemap.
	  --&gt;
	&lt;xsl:variable name=&quot;has-lastmod&quot;    select=&quot;count( /sitemap:urlset/sitemap:url/sitemap:lastmod )&quot;    /&gt;
	&lt;xsl:variable name=&quot;has-changefreq&quot; select=&quot;count( /sitemap:urlset/sitemap:url/sitemap:changefreq )&quot; /&gt;
	&lt;xsl:variable name=&quot;has-priority&quot;   select=&quot;count( /sitemap:urlset/sitemap:url/sitemap:priority )&quot;   /&gt;

	&lt;xsl:template match=&quot;/&quot;&gt;
		&lt;html {$lang}&gt;
			&lt;head&gt;
				&lt;title&gt;{$title}&lt;/title&gt;
				&lt;style&gt;
					{$css}
				&lt;/style&gt;
			&lt;/head&gt;
			&lt;body&gt;
				&lt;div id=&quot;sitemap&quot;&gt;
					&lt;div id=&quot;sitemap__header&quot;&gt;
						&lt;h1&gt;{$title}&lt;/h1&gt;
						&lt;p&gt;{$description}&lt;/p&gt;
						&lt;p&gt;{$learn_more}&lt;/p&gt;
					&lt;/div&gt;
					&lt;div id=&quot;sitemap__content&quot;&gt;
						&lt;p class=&quot;text&quot;&gt;{$text}&lt;/p&gt;
						&lt;table id=&quot;sitemap__table&quot;&gt;
							&lt;thead&gt;
								&lt;tr&gt;
									&lt;th class=&quot;loc&quot;&gt;{$url}&lt;/th&gt;
									&lt;xsl:if test=&quot;\$has-lastmod&quot;&gt;
										&lt;th class=&quot;lastmod&quot;&gt;{$lastmod}&lt;/th&gt;
									&lt;/xsl:if&gt;
									&lt;xsl:if test=&quot;\$has-changefreq&quot;&gt;
										&lt;th class=&quot;changefreq&quot;&gt;{$changefreq}&lt;/th&gt;
									&lt;/xsl:if&gt;
									&lt;xsl:if test=&quot;\$has-priority&quot;&gt;
										&lt;th class=&quot;priority&quot;&gt;{$priority}&lt;/th&gt;
									&lt;/xsl:if&gt;
								&lt;/tr&gt;
							&lt;/thead&gt;
							&lt;tbody&gt;
								&lt;xsl:for-each select=&quot;sitemap:urlset/sitemap:url&quot;&gt;
									&lt;tr&gt;
										&lt;td class=&quot;loc&quot;&gt;&lt;a href=&quot;{sitemap:loc}&quot;&gt;&lt;xsl:value-of select=&quot;sitemap:loc&quot; /&gt;&lt;/a&gt;&lt;/td&gt;
										&lt;xsl:if test=&quot;\$has-lastmod&quot;&gt;
											&lt;td class=&quot;lastmod&quot;&gt;&lt;xsl:value-of select=&quot;sitemap:lastmod&quot; /&gt;&lt;/td&gt;
										&lt;/xsl:if&gt;
										&lt;xsl:if test=&quot;\$has-changefreq&quot;&gt;
											&lt;td class=&quot;changefreq&quot;&gt;&lt;xsl:value-of select=&quot;sitemap:changefreq&quot; /&gt;&lt;/td&gt;
										&lt;/xsl:if&gt;
										&lt;xsl:if test=&quot;\$has-priority&quot;&gt;
											&lt;td class=&quot;priority&quot;&gt;&lt;xsl:value-of select=&quot;sitemap:priority&quot; /&gt;&lt;/td&gt;
										&lt;/xsl:if&gt;
									&lt;/tr&gt;
								&lt;/xsl:for-each&gt;
							&lt;/tbody&gt;
						&lt;/table&gt;
					&lt;/div&gt;
				&lt;/div&gt;
			&lt;/body&gt;
		&lt;/html&gt;
	&lt;/xsl:template&gt;
&lt;/xsl:stylesheet&gt;

XSL;

		/**
		 * Filters the content of the sitemap stylesheet.
		 *
		 * @since 5.5.0
		 *
		 * @param string $xsl_content Full content for the XML stylesheet.
		 */
		return apply_filters( 'wp_sitemaps_stylesheet_content', $xsl_content );
	}

	/**
	 * Returns the escaped XSL for the index sitemaps.
	 *
	 * @since 5.5.0
	 */
	public function get_sitemap_index_stylesheet() {
		$css         = $this-&gt;get_stylesheet_css();
		$title       = esc_xml( __( 'XML Sitemap' ) );
		$description = esc_xml( __( 'This XML Sitemap is generated by WordPress to make your content more visible for search engines.' ) );
		$learn_more  = sprintf(
			'&lt;a href=&quot;%s&quot;&gt;%s&lt;/a&gt;',
			esc_url( __( 'https://www.sitemaps.org/' ) ),
			esc_xml( __( 'Learn more about XML sitemaps.' ) )
		);

		$text = sprintf(
			/* translators: %s: Number of URLs. */
			esc_xml( __( 'Number of URLs in this XML Sitemap: %s.' ) ),
			'&lt;xsl:value-of select=&quot;count( sitemap:sitemapindex/sitemap:sitemap )&quot; /&gt;'
		);

		$lang    = get_language_attributes( 'html' );
		$url     = esc_xml( __( 'URL' ) );
		$lastmod = esc_xml( __( 'Last Modified' ) );

		$xsl_content = &lt;&lt;&lt;XSL
&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;xsl:stylesheet
		version=&quot;1.0&quot;
		xmlns:xsl=&quot;http://www.w3.org/1999/XSL/Transform&quot;
		xmlns:sitemap=&quot;http://www.sitemaps.org/schemas/sitemap/0.9&quot;
		exclude-result-prefixes=&quot;sitemap&quot;
		&gt;

	&lt;xsl:output method=&quot;html&quot; encoding=&quot;UTF-8&quot; indent=&quot;yes&quot; /&gt;

	&lt;!--
	  Set variables for whether lastmod occurs for any sitemap in the index.
	  We do this up front because it can be expensive in a large sitemap.
	  --&gt;
	&lt;xsl:variable name=&quot;has-lastmod&quot; select=&quot;count( /sitemap:sitemapindex/sitemap:sitemap/sitemap:lastmod )&quot; /&gt;

	&lt;xsl:template match=&quot;/&quot;&gt;
		&lt;html {$lang}&gt;
			&lt;head&gt;
				&lt;title&gt;{$title}&lt;/title&gt;
				&lt;style&gt;
					{$css}
				&lt;/style&gt;
			&lt;/head&gt;
			&lt;body&gt;
				&lt;div id=&quot;sitemap&quot;&gt;
					&lt;div id=&quot;sitemap__header&quot;&gt;
						&lt;h1&gt;{$title}&lt;/h1&gt;
						&lt;p&gt;{$description}&lt;/p&gt;
						&lt;p&gt;{$learn_more}&lt;/p&gt;
					&lt;/div&gt;
					&lt;div id=&quot;sitemap__content&quot;&gt;
						&lt;p class=&quot;text&quot;&gt;{$text}&lt;/p&gt;
						&lt;table id=&quot;sitemap__table&quot;&gt;
							&lt;thead&gt;
								&lt;tr&gt;
									&lt;th class=&quot;loc&quot;&gt;{$url}&lt;/th&gt;
									&lt;xsl:if test=&quot;\$has-lastmod&quot;&gt;
										&lt;th class=&quot;lastmod&quot;&gt;{$lastmod}&lt;/th&gt;
									&lt;/xsl:if&gt;
								&lt;/tr&gt;
							&lt;/thead&gt;
							&lt;tbody&gt;
								&lt;xsl:for-each select=&quot;sitemap:sitemapindex/sitemap:sitemap&quot;&gt;
									&lt;tr&gt;
										&lt;td class=&quot;loc&quot;&gt;&lt;a href=&quot;{sitemap:loc}&quot;&gt;&lt;xsl:value-of select=&quot;sitemap:loc&quot; /&gt;&lt;/a&gt;&lt;/td&gt;
										&lt;xsl:if test=&quot;\$has-lastmod&quot;&gt;
											&lt;td class=&quot;lastmod&quot;&gt;&lt;xsl:value-of select=&quot;sitemap:lastmod&quot; /&gt;&lt;/td&gt;
										&lt;/xsl:if&gt;
									&lt;/tr&gt;
								&lt;/xsl:for-each&gt;
							&lt;/tbody&gt;
						&lt;/table&gt;
					&lt;/div&gt;
				&lt;/div&gt;
			&lt;/body&gt;
		&lt;/html&gt;
	&lt;/xsl:template&gt;
&lt;/xsl:stylesheet&gt;

XSL;

		/**
		 * Filters the content of the sitemap index stylesheet.
		 *
		 * @since 5.5.0
		 *
		 * @param string $xsl_content Full content for the XML stylesheet.
		 */
		return apply_filters( 'wp_sitemaps_stylesheet_index_content', $xsl_content );
	}

	/**
	 * Gets the CSS to be included in sitemap XSL stylesheets.
	 *
	 * @since 5.5.0
	 *
	 * @return string The CSS.
	 */
	public function get_stylesheet_css() {
		$text_align = is_rtl() ? 'right' : 'left';

		$css = &lt;&lt;&lt;EOF

					body {
						font-family: -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, Oxygen-Sans, Ubuntu, Cantarell, &quot;Helvetica Neue&quot;, sans-serif;
						color: #444;
					}

					#sitemap {
						max-width: 980px;
						margin: 0 auto;
					}

					#sitemap__table {
						width: 100%;
						border: solid 1px #ccc;
						border-collapse: collapse;
					}

			 		#sitemap__table tr td.loc {
						/*
						 * URLs should always be LTR.
						 * See https://core.trac.wordpress.org/ticket/16834
						 * and https://core.trac.wordpress.org/ticket/49949
						 */
						direction: ltr;
					}

					#sitemap__table tr th {
						text-align: {$text_align};
					}

					#sitemap__table tr td,
					#sitemap__table tr th {
						padding: 10px;
					}

					#sitemap__table tr:nth-child(odd) td {
						background-color: #eee;
					}

					a:hover {
						text-decoration: none;
					}

EOF;

		/**
		 * Filters the CSS only for the sitemap stylesheet.
		 *
		 * @since 5.5.0
		 *
		 * @param string $css CSS to be applied to default XSL file.
		 */
		return apply_filters( 'wp_sitemaps_stylesheet_css', $css );
	}
}
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