do not fail with twig 3

Author: dbu

composer.json

@@ -63,7 +63,7 @@
         "symfony/stopwatch": "^3.4.20 || ^4.2.1",
         "symfony/twig-bundle": "^3.4.20 || ^4.2.1",
         "symfony/web-profiler-bundle": "^3.4.20 || ^4.2.1",
-        "twig/twig": "^1.41 || ^2.10"
+        "twig/twig": "^1.41 || ^2.10 || ^3.0"
     },
     "suggest": {
         "php-http/cache-plugin": "To configure clients that cache responses",

src/Collector/Twig/HttpMessageMarkupExtension.php

@@ -2,10 +2,20 @@
 
 namespace Http\HttplugBundle\Collector\Twig;
 
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
+
+if (!\class_exists(AbstractExtension::class)) {
+    class_alias(\Twig_Extension::class, AbstractExtension::class);
+}
+if (!\class_exists(TwigFilter::class)) {
+    class_alias(\Twig_SimpleFilter::class, TwigFilter::class);
+}
+
 /**
  * @author Tobias Nyholm <[email protected]>
  */
-class HttpMessageMarkupExtension extends \Twig_Extension
+class HttpMessageMarkupExtension extends AbstractExtension
 {
     /**
      * {@inheritdoc}
@@ -15,7 +25,7 @@ class HttpMessageMarkupExtension extends \Twig_Extension
     public function getFilters()
     {
         return [
-            new \Twig_SimpleFilter('httplug_markup', [$this, 'markup'], ['is_safe' => ['html']]),
+            new TwigFilter('httplug_markup', [$this, 'markup'], ['is_safe' => ['html']]),
         ];
     }