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diff --git a/vendor/psy/psysh/src/Psy/Command/ListCommand/Enumerator.php b/vendor/psy/psysh/src/Psy/Command/ListCommand/Enumerator.php
new file mode 100644
index 000000000..5e612cb08
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/Command/ListCommand/Enumerator.php
@@ -0,0 +1,146 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Command\ListCommand;
+
+use Psy\Formatter\SignatureFormatter;
+use Psy\Util\Mirror;
+use Psy\VarDumper\Presenter;
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Abstract Enumerator class.
+ */
+abstract class Enumerator
+{
+    // Output styles
+    const IS_PUBLIC    = 'public';
+    const IS_PROTECTED = 'protected';
+    const IS_PRIVATE   = 'private';
+    const IS_GLOBAL    = 'global';
+    const IS_CONSTANT  = 'const';
+    const IS_CLASS     = 'class';
+    const IS_FUNCTION  = 'function';
+
+    private $presenter;
+
+    private $filter       = false;
+    private $invertFilter = false;
+    private $pattern;
+
+    /**
+     * Enumerator constructor.
+     *
+     * @param Presenter $presenter
+     */
+    public function __construct(Presenter $presenter)
+    {
+        $this->presenter = $presenter;
+    }
+
+    /**
+     * Return a list of categorized things with the given input options and target.
+     *
+     * @param InputInterface $input
+     * @param Reflector      $reflector
+     * @param mixed          $target
+     *
+     * @return array
+     */
+    public function enumerate(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        $this->setFilter($input);
+
+        return $this->listItems($input, $reflector, $target);
+    }
+
+    /**
+     * Enumerate specific items with the given input options and target.
+     *
+     * Implementing classes should return an array of arrays:
+     *
+     *     [
+     *         'Constants' => [
+     *             'FOO' => [
+     *                 'name'  => 'FOO',
+     *                 'style' => 'public',
+     *                 'value' => '123',
+     *             ],
+     *         ],
+     *     ]
+     *
+     * @param InputInterface $input
+     * @param Reflector      $reflector
+     * @param mixed          $target
+     *
+     * @return array
+     */
+    abstract protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null);
+
+    protected function presentRef($value)
+    {
+        return $this->presenter->presentRef($value);
+    }
+
+    protected function showItem($name)
+    {
+        return $this->filter === false || (preg_match($this->pattern, $name) xor $this->invertFilter);
+    }
+
+    private function setFilter(InputInterface $input)
+    {
+        if ($pattern = $input->getOption('grep')) {
+            if (substr($pattern, 0, 1) !== '/' || substr($pattern, -1) !== '/' || strlen($pattern) < 3) {
+                $pattern = '/' . preg_quote($pattern, '/') . '/';
+            }
+
+            if ($input->getOption('insensitive')) {
+                $pattern .= 'i';
+            }
+
+            $this->validateRegex($pattern);
+
+            $this->filter       = true;
+            $this->pattern      = $pattern;
+            $this->invertFilter = $input->getOption('invert');
+        } else {
+            $this->filter = false;
+        }
+    }
+
+    /**
+     * Validate that $pattern is a valid regular expression.
+     *
+     * @param string $pattern
+     *
+     * @return bool
+     */
+    private function validateRegex($pattern)
+    {
+        set_error_handler(array('Psy\Exception\ErrorException', 'throwException'));
+        try {
+            preg_match($pattern, '');
+        } catch (ErrorException $e) {
+            throw new RuntimeException(str_replace('preg_match(): ', 'Invalid regular expression: ', $e->getRawMessage()));
+        }
+        restore_error_handler();
+    }
+
+    protected function presentSignature($target)
+    {
+        // This might get weird if the signature is actually for a reflector. Hrm.
+        if (!$target instanceof \Reflector) {
+            $target = Mirror::get($target);
+        }
+
+        return SignatureFormatter::format($target);
+    }
+}