--- /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\Routing\Matcher\Dumper;
+
+/**
+ * Prefix tree of routes preserving routes order.
+ *
+ * @author Arnaud Le Blanc <arnaud.lb@gmail.com>
+ *
+ * @internal
+ */
+class DumperPrefixCollection extends DumperCollection
+{
+ /**
+ * @var string
+ */
+ private $prefix = '';
+
+ /**
+ * Returns the prefix.
+ *
+ * @return string The prefix
+ */
+ public function getPrefix()
+ {
+ return $this->prefix;
+ }
+
+ /**
+ * Sets the prefix.
+ *
+ * @param string $prefix The prefix
+ */
+ public function setPrefix($prefix)
+ {
+ $this->prefix = $prefix;
+ }
+
+ /**
+ * Adds a route in the tree.
+ *
+ * @param DumperRoute $route The route
+ *
+ * @return self
+ *
+ * @throws \LogicException
+ */
+ public function addPrefixRoute(DumperRoute $route)
+ {
+ $prefix = $route->getRoute()->compile()->getStaticPrefix();
+
+ for ($collection = $this; null !== $collection; $collection = $collection->getParent()) {
+ // Same prefix, add to current leave
+ if ($collection->prefix === $prefix) {
+ $collection->add($route);
+
+ return $collection;
+ }
+
+ // Prefix starts with route's prefix
+ if ('' === $collection->prefix || 0 === strpos($prefix, $collection->prefix)) {
+ $child = new self();
+ $child->setPrefix(substr($prefix, 0, strlen($collection->prefix) + 1));
+ $collection->add($child);
+
+ return $child->addPrefixRoute($route);
+ }
+ }
+
+ // Reached only if the root has a non empty prefix
+ throw new \LogicException('The collection root must not have a prefix');
+ }
+
+ /**
+ * Merges nodes whose prefix ends with a slash.
+ *
+ * Children of a node whose prefix ends with a slash are moved to the parent node
+ */
+ public function mergeSlashNodes()
+ {
+ $children = array();
+
+ foreach ($this as $child) {
+ if ($child instanceof self) {
+ $child->mergeSlashNodes();
+ if ('/' === substr($child->prefix, -1)) {
+ $children = array_merge($children, $child->all());
+ } else {
+ $children[] = $child;
+ }
+ } else {
+ $children[] = $child;
+ }
+ }
+
+ $this->setAll($children);
+ }
+}