--- /dev/null
+<?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;
+
+/**
+ * Represents a "<selector>[<namespace>|<attribute> <operator> <value>]" 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 AttributeNode extends AbstractNode
+{
+ /**
+ * @var NodeInterface
+ */
+ private $selector;
+
+ /**
+ * @var string
+ */
+ private $namespace;
+
+ /**
+ * @var string
+ */
+ private $attribute;
+
+ /**
+ * @var string
+ */
+ private $operator;
+
+ /**
+ * @var string
+ */
+ private $value;
+
+ /**
+ * @param NodeInterface $selector
+ * @param string $namespace
+ * @param string $attribute
+ * @param string $operator
+ * @param string $value
+ */
+ public function __construct(NodeInterface $selector, $namespace, $attribute, $operator, $value)
+ {
+ $this->selector = $selector;
+ $this->namespace = $namespace;
+ $this->attribute = $attribute;
+ $this->operator = $operator;
+ $this->value = $value;
+ }
+
+ /**
+ * @return NodeInterface
+ */
+ public function getSelector()
+ {
+ return $this->selector;
+ }
+
+ /**
+ * @return string
+ */
+ public function getNamespace()
+ {
+ return $this->namespace;
+ }
+
+ /**
+ * @return string
+ */
+ public function getAttribute()
+ {
+ return $this->attribute;
+ }
+
+ /**
+ * @return string
+ */
+ public function getOperator()
+ {
+ return $this->operator;
+ }
+
+ /**
+ * @return string
+ */
+ public function getValue()
+ {
+ return $this->value;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getSpecificity()
+ {
+ return $this->selector->getSpecificity()->plus(new Specificity(0, 1, 0));
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function __toString()
+ {
+ $attribute = $this->namespace ? $this->namespace.'|'.$this->attribute : $this->attribute;
+
+ return 'exists' === $this->operator
+ ? sprintf('%s[%s[%s]]', $this->getNodeName(), $this->selector, $attribute)
+ : sprintf("%s[%s[%s %s '%s']]", $this->getNodeName(), $this->selector, $attribute, $this->operator, $this->value);
+ }
+}