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diff --git a/vendor/symfony/css-selector/Node/FunctionNode.php b/vendor/symfony/css-selector/Node/FunctionNode.php
new file mode 100644
index 000000000..612f348c5
--- /dev/null
+++ b/vendor/symfony/css-selector/Node/FunctionNode.php
@@ -0,0 +1,98 @@
+<?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\CssSelector\Node;
+
+use Symfony\Component\CssSelector\Parser\Token;
+
+/**
+ * Represents a "<selector>:<name>(<arguments>)" node.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
+ */
+class FunctionNode extends AbstractNode
+{
+    /**
+     * @var NodeInterface
+     */
+    private $selector;
+
+    /**
+     * @var string
+     */
+    private $name;
+
+    /**
+     * @var Token[]
+     */
+    private $arguments;
+
+    /**
+     * @param NodeInterface $selector
+     * @param string        $name
+     * @param Token[]       $arguments
+     */
+    public function __construct(NodeInterface $selector, $name, array $arguments = array())
+    {
+        $this->selector = $selector;
+        $this->name = strtolower($name);
+        $this->arguments = $arguments;
+    }
+
+    /**
+     * @return NodeInterface
+     */
+    public function getSelector()
+    {
+        return $this->selector;
+    }
+
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * @return Token[]
+     */
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSpecificity()
+    {
+        return $this->selector->getSpecificity()->plus(new Specificity(0, 1, 0));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __toString()
+    {
+        $arguments = implode(', ', array_map(function (Token $token) {
+            return "'".$token->getValue()."'";
+        }, $this->arguments));
+
+        return sprintf('%s[%s:%s(%s)]', $this->getNodeName(), $this->selector, $this->name, $arguments ? '['.$arguments.']' : '');
+    }
+}