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diff --git a/vendor/symfony/expression-language/Compiler.php b/vendor/symfony/expression-language/Compiler.php
new file mode 100644
index 000000000..f32ec36d3
--- /dev/null
+++ b/vendor/symfony/expression-language/Compiler.php
@@ -0,0 +1,148 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage;
+
+/**
+ * Compiles a node to PHP code.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Compiler
+{
+    private $source;
+    private $functions;
+
+    public function __construct(array $functions)
+    {
+        $this->functions = $functions;
+    }
+
+    public function getFunction($name)
+    {
+        return $this->functions[$name];
+    }
+
+    /**
+     * Gets the current PHP code after compilation.
+     *
+     * @return string The PHP code
+     */
+    public function getSource()
+    {
+        return $this->source;
+    }
+
+    public function reset()
+    {
+        $this->source = '';
+
+        return $this;
+    }
+
+    /**
+     * Compiles a node.
+     *
+     * @param Node\Node $node The node to compile
+     *
+     * @return $this
+     */
+    public function compile(Node\Node $node)
+    {
+        $node->compile($this);
+
+        return $this;
+    }
+
+    public function subcompile(Node\Node $node)
+    {
+        $current = $this->source;
+        $this->source = '';
+
+        $node->compile($this);
+
+        $source = $this->source;
+        $this->source = $current;
+
+        return $source;
+    }
+
+    /**
+     * Adds a raw string to the compiled code.
+     *
+     * @param string $string The string
+     *
+     * @return $this
+     */
+    public function raw($string)
+    {
+        $this->source .= $string;
+
+        return $this;
+    }
+
+    /**
+     * Adds a quoted string to the compiled code.
+     *
+     * @param string $value The string
+     *
+     * @return $this
+     */
+    public function string($value)
+    {
+        $this->source .= sprintf('"%s"', addcslashes($value, "\0\t\"\$\\"));
+
+        return $this;
+    }
+
+    /**
+     * Returns a PHP representation of a given value.
+     *
+     * @param mixed $value The value to convert
+     *
+     * @return $this
+     */
+    public function repr($value)
+    {
+        if (is_int($value) || is_float($value)) {
+            if (false !== $locale = setlocale(LC_NUMERIC, 0)) {
+                setlocale(LC_NUMERIC, 'C');
+            }
+
+            $this->raw($value);
+
+            if (false !== $locale) {
+                setlocale(LC_NUMERIC, $locale);
+            }
+        } elseif (null === $value) {
+            $this->raw('null');
+        } elseif (is_bool($value)) {
+            $this->raw($value ? 'true' : 'false');
+        } elseif (is_array($value)) {
+            $this->raw('array(');
+            $first = true;
+            foreach ($value as $key => $value) {
+                if (!$first) {
+                    $this->raw(', ');
+                }
+                $first = false;
+                $this->repr($key);
+                $this->raw(' => ');
+                $this->repr($value);
+            }
+            $this->raw(')');
+        } else {
+            $this->string($value);
+        }
+
+        return $this;
+    }
+}