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diff --git a/vendor/psy/psysh/src/TabCompletion/AutoCompleter.php b/vendor/psy/psysh/src/TabCompletion/AutoCompleter.php
new file mode 100644
index 000000000..bf538106a
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+++ b/vendor/psy/psysh/src/TabCompletion/AutoCompleter.php
@@ -0,0 +1,112 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2018 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\TabCompletion;
+
+use Psy\TabCompletion\Matcher\AbstractMatcher;
+
+/**
+ * A readline tab completion service.
+ *
+ * @author Marc Garcia <markcial@gmail.com>
+ */
+class AutoCompleter
+{
+    /** @var Matcher\AbstractMatcher[] */
+    protected $matchers;
+
+    /**
+     * Register a tab completion Matcher.
+     *
+     * @param AbstractMatcher $matcher
+     */
+    public function addMatcher(AbstractMatcher $matcher)
+    {
+        $this->matchers[] = $matcher;
+    }
+
+    /**
+     * Activate readline tab completion.
+     */
+    public function activate()
+    {
+        readline_completion_function([&$this, 'callback']);
+    }
+
+    /**
+     * Handle readline completion.
+     *
+     * @param string $input Readline current word
+     * @param int    $index Current word index
+     * @param array  $info  readline_info() data
+     *
+     * @return array
+     */
+    public function processCallback($input, $index, $info = [])
+    {
+        // Some (Windows?) systems provide incomplete `readline_info`, so let's
+        // try to work around it.
+        $line = $info['line_buffer'];
+        if (isset($info['end'])) {
+            $line = substr($line, 0, $info['end']);
+        }
+        if ($line === '' && $input !== '') {
+            $line = $input;
+        }
+
+        $tokens = token_get_all('<?php ' . $line);
+
+        // remove whitespaces
+        $tokens = array_filter($tokens, function ($token) {
+            return !AbstractMatcher::tokenIs($token, AbstractMatcher::T_WHITESPACE);
+        });
+
+        $matches = [];
+        foreach ($this->matchers as $matcher) {
+            if ($matcher->hasMatched($tokens)) {
+                $matches = array_merge($matcher->getMatches($tokens), $matches);
+            }
+        }
+
+        $matches = array_unique($matches);
+
+        return !empty($matches) ? $matches : [''];
+    }
+
+    /**
+     * The readline_completion_function callback handler.
+     *
+     * @see processCallback
+     *
+     * @param string $input
+     * @param int    $index
+     *
+     * @return array
+     */
+    public function callback($input, $index)
+    {
+        return $this->processCallback($input, $index, readline_info());
+    }
+
+    /**
+     * Remove readline callback handler on destruct.
+     */
+    public function __destruct()
+    {
+        // PHP didn't implement the whole readline API when they first switched
+        // to libedit. And they still haven't.
+        //
+        // So this is a thing to make PsySH work on 5.3.x:
+        if (function_exists('readline_callback_handler_remove')) {
+            readline_callback_handler_remove();
+        }
+    }
+}