[Smush Pro] - Smart Slider 3 Support

wpmudev-smush-smart-slider-support.php

<?php
/**
* Plugin Name: [Smush Pro] - Smart Slider 3 Support
* Plugin URI: https://premium.wpmudev.org/
* Description: Alter Smush's buffer for pages with Smart Slider 3 (as of 3.3.2)
* Author: Alessandro Kaounas @ WPMUDEV
* Author URI: https://premium.wpmudev.org/
* License: GPLv2 or later
*/

use Smush\WP_Smush;
use Smush\Core\Settings;
use Smush\Core\Modules\Helpers\Parser;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'WPMUDEV_Smush_Smart_Slider' ) ) {
    
    class WPMUDEV_Smush_Smart_Slider {

		private static $_instance 		= null;
		
		private $cdn 					= false;
		private $lazy_load 				= false;

        public static function get_instance() {

            if( is_null( self::$_instance ) ){
                self::$_instance = new WPMUDEV_Smush_Smart_Slider();
            }
            return self::$_instance;
            
        }

        private function __construct() {
		
			if( ! class_exists( '\\Smush\\WP_Smush' ) ){
				return;
			}
		
			$this->init();
			
        }

        private function init() {

			$settings = Settings::get_instance();

			if ( $settings->get( 'lazy_load' ) ) {
				$this->lazy_load = $settings->get( 'lazy_load' );
			}
	
			if ( $settings->get( 'cdn' ) ) {
				$this->cdn = $settings->get( 'cdn' );
			}

			// Do not parse page if CDN and Lazy load modules are disabled.
			if ( ! $this->cdn && ! $this->lazy_load ) {
				return $content;
			}

			add_action( 'template_redirect', function () { ob_start( array( $this, 'parse_page' ) ); }, 1 );
			
		}

		public function parse_page( $content ) {

			if ( empty( $content ) || apply_filters( 'wp_smush_should_skip_parse', false ) ) {
				return $content;
			}
	
			$content = $this->process_custom_images( $content );

			return $content;

		}

		private function process_custom_images( $content ) {

			// Match elements with $this->data_attr attribute
			if ( preg_match_all( '/(?:data-(?:desktop|desktop-retina|tablet|tablet-retina|mobile|mobile-retina|thumbnail)=[\'|"](?P<img_url>(http?s?:?|)\/\/[^"\']*\.(?:png|jpg|jpeg|gif))[\'|"]\)?){1}/is', $content, $images ) ) {
				foreach ( $images as $key => $unused ) {
					// Simplify the output as much as possible, mostly for confirming test results.
					if ( is_numeric( $key ) && $key > 0 ) {
						unset( $images[ $key ] );
					}
				}
			}
	
			if ( empty( $images ) ) {
				return $content;
			}
	
			foreach ( $images['img_url'] as $key => $image ) {
	
				$content = str_replace( $image, WP_Smush::get_instance()->core()->mod->cdn->generate_cdn_url( $image ), $content );

			}
	
			return $content;

		}

    }

    if ( ! function_exists( 'wpmudev_smush_smart_slider' ) ) {

        function wpmudev_smush_smart_slider() {
            return WPMUDEV_Smush_Smart_Slider::get_instance();
        };

        add_action( 'plugins_loaded', 'wpmudev_smush_smart_slider', 99 );
    }

}