Align Twig version with Drupal core

Author: Chi-teck

composer.json

@@ -6,7 +6,7 @@
     "ext-json": "*",
     "symfony/console": "^3.4 || ^4.0",
     "symfony/filesystem": "^2.7 || ^3.4 || ^4.0",
-    "twig/twig": "^1.39 || ^2.10"
+    "twig/twig": "^1.38.2 || ^2.10"
   },
   "bin": [
     "bin/dcg"

src/bootstrap.php

@@ -30,10 +30,16 @@ function dcg_create_application() {
   return ApplicationFactory::create();
 }
 
+// Determine major Twig version.
+// Twig_Environment::MAJOR_VERSION is not suitable here because of
+// https://github.com/twigphp/Twig/pull/2945
+// Use this workaround as drupal/drupal is locked on Twig 1.38.
+list($twig_major_version) = sscanf(Twig_Environment::VERSION, '%d.%d.%d');
+
 // Twig_Environment::tokenize() signature has been changed in Twig 2, so that
 // it is not possible to maintain the same Twig_Environment sub-class for both
 // Twig versions.
-$twig_environment_class = sprintf('DrupalCodeGenerator\Twig\Twig%dEnvironment', Twig_Environment::MAJOR_VERSION);
+$twig_environment_class = sprintf('DrupalCodeGenerator\Twig\Twig%dEnvironment', $twig_major_version);
 class_alias($twig_environment_class, 'DrupalCodeGenerator\Twig\TwigEnvironment');
 
 // Legacy TwigEnvironment class is still used in Drush.