feature #4501 adds support for invoking closures (faizanakram99)

This PR was squashed before being merged into the 3.x branch.

Discussion
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adds support for invoking closures

- fixes #3848

Commits
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0a61801 adds support for invoking closures

CHANGELOG

@@ -6,6 +6,7 @@
 
  * Fix the null coalescing operator when the test returns null
  * Fix the Elvis operator when used as '? :' instead of '?:'
+ * Support for invoking closures
 
 # 3.17.0 (2024-12-10)
 

src/Extension/CoreExtension.php

@@ -1740,6 +1740,10 @@ public static function getAttribute(Environment $env, Source $source, $object, $
 
             static $propertyCheckers = [];
 
+            if ($object instanceof \Closure && '__invoke' === $item) {
+                return $isDefinedTest ? true : $object();
+            }
+
             if (isset($object->$item)
                 || ($propertyCheckers[$object::class][$item] ??= self::getPropertyChecker($object::class, $item))($object, $item)
             ) {
@@ -1777,6 +1781,9 @@ public static function getAttribute(Environment $env, Source $source, $object, $
         // precedence: getXxx() > isXxx() > hasXxx()
         if (!isset($cache[$class])) {
             $methods = get_class_methods($object);
+            if ($object instanceof \Closure) {
+                $methods[] = '__invoke';
+            }
             sort($methods);
             $lcMethods = array_map('strtolower', $methods);
             $classCache = [];

tests/TemplateTest.php

@@ -394,6 +394,10 @@ public static function getGetAttributeTests()
             [true, ['foo' => 'bar'], $arrayAccess, 'vars', [], $anyType],
         ]);
 
+        // test for Closure::__invoke()
+        $tests[] = [true, 'closure called', fn (): string => 'closure called', '__invoke', [], $anyType];
+        $tests[] = [true, 'closure called', fn (): string => 'closure called', '__invoke', [], $methodType];
+
         // tests when input is not an array or object
         $tests = array_merge($tests, [
             [false, null, 42, 'a', [], $anyType, 'Impossible to access an attribute ("a") on a int variable ("42") in "index.twig".'],