feat: support Twig 3 alongside Twig 2

composer.json

@@ -39,7 +39,7 @@
         "psr/log": "^1.0",
         "ptachoire/cssembed": "^1.0",
         "symfony/phpunit-bridge": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0",
-        "twig/twig": "^2.11",
+        "twig/twig": "^2.11 || ^3.0",
         "phpspec/prophecy-phpunit": "^2.0"
     },
     "suggest": {

src/Assetic/Extension/Twig/AsseticNode.php

@@ -3,9 +3,12 @@
 namespace Assetic\Extension\Twig;
 
 use Assetic\Contracts\Asset\AssetInterface;
+use Twig\Attribute\YieldReady;
 use Twig\Compiler;
+use Twig\Environment;
 use Twig\Node\Node;
 
+#[YieldReady]
 class AsseticNode extends Node
 {
     /**
@@ -36,7 +39,14 @@ public function __construct(AssetInterface $asset, Node $body, array $inputs, ar
             array('asset' => $asset, 'inputs' => $inputs, 'filters' => $filters, 'name' => $name)
         );
 
-        parent::__construct($nodes, $attributes, $lineno, $tag);
+        // Twig 3.12 deprecated passing the node tag to the constructor; the
+        // Parser now sets it automatically. Twig 2.x and Twig < 3.12 still
+        // expect it to be supplied here.
+        if (version_compare(Environment::VERSION, '3.12.0', '>=')) {
+            parent::__construct($nodes, $attributes, $lineno);
+        } else {
+            parent::__construct($nodes, $attributes, $lineno, $tag);
+        }
     }
 
     public function compile(Compiler $compiler)

src/Assetic/Extension/Twig/AsseticTokenParser.php

@@ -88,7 +88,13 @@ public function parse(Token $token)
                 // vars=['locale','browser']
                 $stream->next();
                 $stream->expect(Token::OPERATOR_TYPE, '=');
-                $stream->expect(Token::PUNCTUATION_TYPE, '[');
+
+                // Twig 2 lexes the opening "[" as punctuation, Twig 3 as an operator.
+                if ($stream->test(Token::OPERATOR_TYPE, '[')) {
+                    $stream->next();
+                } else {
+                    $stream->expect(Token::PUNCTUATION_TYPE, '[');
+                }
 
                 while ($stream->test(Token::STRING_TYPE)) {
                     $attributes['vars'][] = $stream->expect(Token::STRING_TYPE)->getValue();

tests/Assetic/Test/Extension/Twig/AsseticExtensionTest.php

@@ -254,6 +254,6 @@ public function testUnclosedTag()
 
     private function renderXml($name, $context = [])
     {
-        return new \SimpleXMLElement($this->twig->loadTemplate($name)->render($context));
+        return new \SimpleXMLElement($this->twig->load($name)->render($context));
     }
 }