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<?php
namespace Yoast\WP\SEO\Presenters;
/**
* Presenter class for the rel prev meta tag.
*/
class Rel_Prev_Presenter extends Abstract_Indexable_Tag_Presenter {
/**
* The tag format including placeholders.
*
* @var string
*/
protected $tag_format = '<link rel="prev" href="%s" />';
/**
* The method of escaping to use.
*
* @var string
*/
protected $escaping = 'url';
/**
* Returns the rel prev meta tag.
*
* @param bool $output_tag Optional. Whether or not to output the HTML tag. Defaults to true.
*
* @return string The rel prev tag.
*/
public function present( $output_tag = true ) {
$output = parent::present();
if ( ! empty( $output ) ) {
/**
* Filter: 'wpseo_prev_rel_link' - Allow changing link rel output by Yoast SEO.
*
* @api string $unsigned The full `<link` element.
*/
return \apply_filters( 'wpseo_prev_rel_link', $output );
}
return '';
}
/**
* Run the rel prev content through the `wpseo_adjacent_rel_url` filter.
*
* @return string $rel_prev The filtered adjacent link.
*/
public function get() {
if ( \in_array( 'noindex', $this->presentation->robots, true ) ) {
return '';
}
/**
* Filter: 'wpseo_adjacent_rel_url' - Allow filtering of the rel prev URL put out by Yoast SEO.
*
* @api string $canonical The rel prev URL.
*
* @param string $rel Link relationship, prev or next.
*/
return (string) \trim( \apply_filters( 'wpseo_adjacent_rel_url', $this->presentation->rel_prev, 'prev', $this->presentation ) );
}
}
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