Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/css-selector/Node/AttributeNode.php

@@ -0,0 +1,124 @@
+<?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>
+ */
+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);
+    }
+}