added "filter", "map", and "reduce" filters

src/Node/Expression/ArrowFunctionExpression.php

@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * 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.
+ */
+
+namespace Twig\Node\Expression;
+
+use Twig\Compiler;
+
+/**
+ * Represents an arrow function.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ArrowFunctionExpression extends AbstractExpression
+{
+    public function __construct(AbstractExpression $expr, array $names, $lineno, $tag = null)
+    {
+        parent::__construct(['expr' => $expr], ['names' => $names], $lineno, $tag);
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->raw('function (')
+        ;
+        foreach ($this->getAttribute('names') as $i => $name) {
+            if ($i) {
+                $compiler->raw(', ');
+            }
+
+            $compiler->raw('$__'.$name.'__');
+        }
+        $compiler
+            ->raw(') use ($context) { ')
+        ;
+        foreach ($this->getAttribute('names') as $name) {
+            $compiler->raw('$context["'.$name.'"] = $__'.$name.'__; ');
+        }
+        $compiler
+            ->raw('return ')
+            ->subcompile($this->getNode('expr'))
+            ->raw('; }')
+        ;
+    }
+}