<?php
declare(strict_types=1);
namespace WP_Rocket\Engine\Optimization\RUCSS\Frontend;
use WP_Rocket\Event_Management\Subscriber_Interface;
use WP_Rocket\Engine\Optimization\RUCSS\Controller\UsedCSS;
class Subscriber implements Subscriber_Interface {
/**
* UsedCss instance
*
* @var UsedCSS
*/
private $used_css;
/**
* Instantiate the class
*
* @param UsedCSS $used_css UsedCSS instance.
*/
public function __construct( UsedCSS $used_css ) {
$this->used_css = $used_css;
}
/**
* Return an array of events that this subscriber listens to.
*
* @return array
*/
public static function get_subscribed_events(): array {
return [
'rocket_buffer' => [ 'treeshake', 1000 ],
'rocket_disable_preload_fonts' => 'maybe_disable_preload_fonts',
];
}
/**
* Apply TreeShaked CSS to the current HTML page.
*
* @param string $html HTML content.
*
* @return string HTML content.
*/
public function treeshake( string $html ): string {
return $this->used_css->treeshake( $html );
}
/**
* Disables the preload fonts if RUCSS is enabled
*
* @since 3.9
*
* @param bool $value Value for the disable preload fonts filter.
*
* @return bool
*/
public function maybe_disable_preload_fonts( $value ): bool {
if ( $this->used_css->is_allowed() ) {
return true;
}
return $value;
}
}