Add optimization of Monster Insights.

Author: kagg-design

composer.json

@@ -32,19 +32,19 @@
       "dealerdirect/phpcodesniffer-composer-installer": true
     },
     "platform": {
-      "php": "7.0"
+      "php": "7.2"
     }
   },
   "require": {
     "ext-json": "*",
-    "tedivm/jshrink": "^v1.6.8"
+    "tedivm/jshrink": "^v1.7.0"
   },
   "require-dev": {
     "roave/security-advisories": "dev-latest",
-    "squizlabs/php_codesniffer": "^3.7.2",
+    "squizlabs/php_codesniffer": "^3.11.1",
     "phpcompatibility/php-compatibility": "^9.3.5",
-    "phpcompatibility/phpcompatibility-wp": "^2.1.3",
-    "wp-coding-standards/wpcs": "^3.0.0"
+    "phpcompatibility/phpcompatibility-wp": "^2.1.5",
+    "wp-coding-standards/wpcs": "^3.1.0"
   },
   "autoload": {
     "psr-4": {

src/php/DelayedScript.php

@@ -182,6 +182,7 @@ public static function launch_stored_scripts(): void {
 	 * @noinspection JSUnusedLocalSymbols
 	 */
 	private static function get_js( array $args, bool $async = true ): string {
+		unset( $args['async'] );
 		$async_string = $async ? 'true' : 'false';
 
 		$js = <<<JS
@@ -196,7 +197,7 @@ private static function get_js( array $args, bool $async = true ): string {
 		foreach ( $args as $key => $arg ) {
 			if ( 'data' === $key ) {
 				foreach ( $arg as $data_key => $data_arg ) {
-					$js .= "\t\t\ts.dataset.$data_key = '$data_arg';\n";
+					$js .= "\t\t\ts.setAttribute( 'data-' + '$data_key', '$data_arg' );\n";
 				}
 				continue;
 			}

src/php/Main.php

@@ -107,6 +107,7 @@ public function init(): void {
 		new FBShareLikeButton();
 		new StatCounter();
 		new Clutch();
+		new MonsterInsights();
 	}
 
 	/**

src/php/MonsterInsights.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * MonsterInsights class file.
+ *
+ * @package kagg_pagespeed_optimization
+ */
+
+namespace KAGG\PageSpeed\Optimization;
+
+/**
+ * Class MonsterInsights.
+ */
+class MonsterInsights {
+
+	/**
+	 * Constructor.
+	 */
+	public function __construct() {
+		add_action( 'plugins_loaded', [ $this, 'init_hooks' ] );
+	}
+
+	/**
+	 * Init hooks.
+	 */
+	public function init_hooks(): void {
+		if ( ! defined( 'MONSTERINSIGHTS_VERSION' ) ) {
+			return;
+		}
+
+		add_action( 'monsterinsights_tracking_before_gtag', [ $this, 'before_gtag' ] );
+		add_action( 'monsterinsights_tracking_after_gtag', [ $this, 'after_gtag' ] );
+	}
+
+	/**
+	 * Before gtag.
+	 *
+	 * @return void
+	 */
+	public function before_gtag(): void {
+		ob_start();
+	}
+
+	/**
+	 * After gtag.
+	 *
+	 * @return void
+	 */
+	public function after_gtag(): void {
+		$g_tag = ob_get_clean();
+
+		if ( preg_match( '#<script.+googletagmanager.+?</script>#', $g_tag, $matches ) ) {
+			$script_tag = $matches[0];
+
+			preg_match( '#<script (.+)></script>#', $script_tag, $matches );
+
+			$script_args = $matches[1] ?? '';
+
+			preg_match_all( '#([\w|-]+)=["\']([^"\']+)["\']|([\w|-]+)#', $script_args, $matches );
+
+			$keys   = array_filter( $matches[1] ) + array_filter( $matches[3] );
+			$values = $matches[2];
+			$args   = array_combine( $keys, $values );
+			$data   = [];
+
+			foreach ( $args as $key => $value ) {
+				if ( 0 === strpos( $key, 'data-' ) ) {
+					$data[ str_replace( 'data-', '', $key ) ] = $value;
+					unset( $args[ $key ] );
+				}
+			}
+
+			$args['data'] = $data;
+
+			$g_tag  = str_replace( $script_tag, '', $g_tag );
+
+			DelayedScript::launch( $args );
+		}
+
+        DelayedScript::launch_html( $g_tag );
+	}
+}