fix: compatibility with Foogallery plugin when the gallery uses lazyload too

Author: selul

inc/app_replacer.php

@@ -20,6 +20,12 @@ abstract class Optml_App_Replacer {
 	 * @var array
 	 */
 	protected static $size_to_crop = array();
+	/**
+	 * Holds possible src attributes.
+	 *
+	 * @var array
+	 */
+	protected static $possible_src_attributes = null;
 	/**
 	 * Settings handler.
 	 *
@@ -78,7 +84,23 @@ abstract class Optml_App_Replacer {
 	 *
 	 * @var array Integrations classes.
 	 */
-	private $compatibilities = array( 'shortcode_ultimate' );
+	private $compatibilities = array( 'shortcode_ultimate', 'foogallery' );
+
+	/**
+	 * Returns possible src attributes.
+	 *
+	 * @return array
+	 */
+	public static function possible_src_attributes() {
+
+		if ( null != self::$possible_src_attributes && is_array( self::$possible_src_attributes ) ) {
+			return self::$possible_src_attributes;
+		}
+
+		self::$possible_src_attributes = apply_filters( 'optml_possible_src_attributes', [] );
+
+		return self::$possible_src_attributes;
+	}
 
 	/**
 	 * Size to crop maping.

inc/compatibilities/foogallery.php

@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * Class Optml_shortcode_ultimate.
+ *
+ * @reason The gallery output contains a different src attribute used for lazyload
+ * which prevented optimole to parse the tag.
+ */
+class Optml_foogallery extends Optml_compatibility {
+
+	/**
+	 * Should we load the integration logic.
+	 *
+	 * @return bool Should we load.
+	 */
+	function should_load() {
+		include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
+
+		return is_plugin_active( 'foogallery/foogallery.php' );
+	}
+
+	/**
+	 * Register integration details.
+	 */
+	public function register() {
+		add_filter( 'optml_possible_src_attributes', [ $this, 'add_lazysrc' ], 10, 3 );
+	}
+
+	/**
+	 * Add foogallery lazysrc attribute.
+	 *
+	 * @param array $attributes Old src attributes.
+	 *
+	 * @return array New src attributes.
+	 */
+	function add_lazysrc( $attributes = array() ) {
+
+		$attributes[] = 'data-src-fg';
+
+		return $attributes;
+	}
+}

inc/lazyload_replacer.php

@@ -116,6 +116,12 @@ public function can_lazyload_for( $url, $tag = '' ) {
 		if ( strpos( $tag, '<noscript' ) !== false ) {
 			return false;
 		}
+		foreach ( self::possible_src_attributes() as $banned_src ) {
+			if ( strpos( $tag, $banned_src ) !== false ) {
+				return false;
+			}
+		}
+
 		if ( ! defined( 'OPTML_DISABLE_PNG_LAZYLOAD' ) ) {
 			return true;
 		}

inc/manager.php

@@ -288,7 +288,6 @@ public function process_images_from_content( $content ) {
 			return $content;
 		}
 		$images = self::parse_images_from_html( $content );
-
 		if ( empty( $images ) ) {
 			return $content;
 		}
@@ -333,7 +332,7 @@ public static function parse_images_from_html( $content ) {
 		$images = array();
 
 		$content = self::strip_header_from_content( $content );
-		if ( preg_match_all( '/(?:<a[^>]+?href=["|\'](?P<link_url>[^\s]+?)["|\'][^>]*?>\s*)?(?P<img_tag>(?:<\s*noscript\s*>\s*)?<img[^>]*?\s+?src=\\\\?["|\'](?P<img_url>[^\s]+?)["|\'].*?>){1}(?:\s*<\/a>)?/ism', $content, $images ) ) {
+		if ( preg_match_all( '/(?:<a[^>]+?href=["|\'](?P<link_url>[^\s]+?)["|\'][^>]*?>\s*)?(?P<img_tag>(?:<\s*noscript\s*>\s*)?<img[^>]*?\s+?(?:' . implode( '|', array_merge( [ 'src' ], Optml_Tag_Replacer::possible_src_attributes() ) ) . ')=\\\\?["|\'](?P<img_url>[^\s]+?)["|\'].*?>){1}(?:\s*<\/a>)?/ism', $content, $images ) ) {
 
 			foreach ( $images as $key => $unused ) {
 				// Simplify the output as much as possible, mostly for confirming test results.