Add support for first class callables

src/Parser.php

@@ -25,6 +25,7 @@ use Twig\Node\NodeOutputInterface;
 use Twig\Node\PrintNode;
 use Twig\Node\TextNode;
 use Twig\TokenParser\TokenParserInterface;
+use Twig\Util\ReflectionCallable;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
@@ -156,8 +157,9 @@ class Parser
                         if (null !== $test) {
                             $e = new SyntaxError(\sprintf('Unexpected "%s" tag', $token->getValue()), $token->getLine(), $this->stream->getSourceContext());
 
-                            if (\is_array($test) && isset($test[0]) && $test[0] instanceof TokenParserInterface) {
+                            $callable = (new ReflectionCallable($test))->getCallable();
-                                $e->appendMessage(\sprintf(' (expecting closing tag for the "%s" tag defined near line %s).', $test[0]->getTag(), $lineno));
+                            if (\is_array($callable) && $callable[0] instanceof TokenParserInterface) {
+                                $e->appendMessage(\sprintf(' (expecting closing tag for the "%s" tag defined near line %s).', $callable[0]->getTag(), $lineno));
                             }
                         } else {
                             $e = new SyntaxError(\sprintf('Unknown "%s" tag.', $token->getValue()), $token->getLine(), $this->stream->getSourceContext());

src/Util/ReflectionCallable.php

@@ -55,8 +55,10 @@ final class ReflectionCallable
             $callable = [$object, $r->name];
             $this->name = get_debug_type($object).'::'.$r->name;
         } elseif (\PHP_VERSION_ID >= 80111 && $class = $r->getClosureCalledClass()) {
+            $callable = [$class->name, $r->name];
             $this->name = $class->name.'::'.$r->name;
         } elseif (\PHP_VERSION_ID < 80111 && $class = $r->getClosureScopeClass()) {
+            $callable = [\is_array($callable) ? $callable[0] : $class->name, $r->name];
             $this->name = (\is_array($callable) ? $callable[0] : $class->name).'::'.$r->name;
         } else {
             $callable = $this->name = $r->name;

tests/Node/Expression/FilterTest.php

@@ -43,6 +43,9 @@ class FilterTest extends NodeTestCase
         $environment->addFilter(new TwigFilter('bar_closure', \Closure::fromCallable(twig_tests_filter_dummy::class), ['needs_environment' => true]));
         $environment->addFilter(new TwigFilter('barbar', 'Twig\Tests\Node\Expression\twig_tests_filter_barbar', ['needs_context' => true, 'is_variadic' => true]));
         $environment->addFilter(new TwigFilter('magic_static', __NAMESPACE__.'\ChildMagicCallStub::magicStaticCall'));
+        if (\PHP_VERSION_ID >= 80111) {
+            $environment->addExtension(new FilterTestExtension());
+        }
 
         $extension = new class() extends AbstractExtension {
             public function getFilters(): array
@@ -121,6 +124,14 @@ class FilterTest extends NodeTestCase
         $node = $this->createFilter($string, 'barbar', ['arg2' => new ConstantExpression('bar', 1)]);
         $tests[] = [$node, 'Twig\Tests\Node\Expression\twig_tests_filter_barbar($context, "abc", null, "bar")', $environment];
 
+        if (\PHP_VERSION_ID >= 80111) {
+            $node = $this->createFilter($string, 'first_class_callable_static');
+            $tests[] = [$node, 'Twig\Tests\Node\Expression\FilterTestExtension::staticMethod("abc")', $environment];
+
+            $node = $this->createFilter($string, 'first_class_callable_object');
+            $tests[] = [$node, '$this->extensions[\'Twig\Tests\Node\Expression\FilterTestExtension\']->objectMethod("abc")', $environment];
+        }
+
         $node = $this->createFilter($string, 'barbar', [
             new ConstantExpression('1', 1),
             new ConstantExpression('2', 1),

tests/Node/Expression/FilterTestExtension.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Twig\Tests\Node\Expression;
+
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+class FilterTestExtension extends AbstractExtension
+{
+    public function getFilters(): array
+    {
+        return [
+            new TwigFilter('first_class_callable_static', self::staticMethod(...)),
+            new TwigFilter('first_class_callable_object', $this->objectMethod(...)),
+        ];
+    }
+
+    public static function staticMethod()
+    {
+    }
+
+    public function objectMethod()
+    {
+    }
+}