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diff --git a/vendor/psy/psysh/src/Context.php b/vendor/psy/psysh/src/Context.php
new file mode 100644
index 000000000..41e0f64df
--- /dev/null
+++ b/vendor/psy/psysh/src/Context.php
@@ -0,0 +1,293 @@
+<?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;
+
+/**
+ * The Shell execution context.
+ *
+ * This class encapsulates the current variables, most recent return value and
+ * exception, and the current namespace.
+ */
+class Context
+{
+    private static $specialNames = ['_', '_e', '__out', '__psysh__', 'this'];
+
+    // Whitelist a very limited number of command-scope magic variable names.
+    // This might be a bad idea, but future me can sort it out.
+    private static $commandScopeNames = [
+        '__function', '__method', '__class', '__namespace', '__file', '__line', '__dir',
+    ];
+
+    private $scopeVariables = [];
+    private $commandScopeVariables = [];
+    private $returnValue;
+    private $lastException;
+    private $lastStdout;
+    private $boundObject;
+
+    /**
+     * Get a context variable.
+     *
+     * @throws InvalidArgumentException If the variable is not found in the current context
+     *
+     * @param string $name
+     *
+     * @return mixed
+     */
+    public function get($name)
+    {
+        switch ($name) {
+            case '_':
+                return $this->returnValue;
+
+            case '_e':
+                if (isset($this->lastException)) {
+                    return $this->lastException;
+                }
+                break;
+
+            case '__out':
+                if (isset($this->lastStdout)) {
+                    return $this->lastStdout;
+                }
+                break;
+
+            case 'this':
+                if (isset($this->boundObject)) {
+                    return $this->boundObject;
+                }
+                break;
+
+            case '__function':
+            case '__method':
+            case '__class':
+            case '__namespace':
+            case '__file':
+            case '__line':
+            case '__dir':
+                if (array_key_exists($name, $this->commandScopeVariables)) {
+                    return $this->commandScopeVariables[$name];
+                }
+                break;
+
+            default:
+                if (array_key_exists($name, $this->scopeVariables)) {
+                    return $this->scopeVariables[$name];
+                }
+                break;
+        }
+
+        throw new \InvalidArgumentException('Unknown variable: $' . $name);
+    }
+
+    /**
+     * Get all defined variables.
+     *
+     * @return array
+     */
+    public function getAll()
+    {
+        return array_merge($this->scopeVariables, $this->getSpecialVariables());
+    }
+
+    /**
+     * Get all defined magic variables: $_, $_e, $__out, $__class, $__file, etc.
+     *
+     * @return array
+     */
+    public function getSpecialVariables()
+    {
+        $vars = [
+            '_' => $this->returnValue,
+        ];
+
+        if (isset($this->lastException)) {
+            $vars['_e'] = $this->lastException;
+        }
+
+        if (isset($this->lastStdout)) {
+            $vars['__out'] = $this->lastStdout;
+        }
+
+        if (isset($this->boundObject)) {
+            $vars['this'] = $this->boundObject;
+        }
+
+        return array_merge($vars, $this->commandScopeVariables);
+    }
+
+    /**
+     * Set all scope variables.
+     *
+     * This method does *not* set any of the magic variables: $_, $_e, $__out,
+     * $__class, $__file, etc.
+     *
+     * @param array $vars
+     */
+    public function setAll(array $vars)
+    {
+        foreach (self::$specialNames as $key) {
+            unset($vars[$key]);
+        }
+
+        foreach (self::$commandScopeNames as $key) {
+            unset($vars[$key]);
+        }
+
+        $this->scopeVariables = $vars;
+    }
+
+    /**
+     * Set the most recent return value.
+     *
+     * @param mixed $value
+     */
+    public function setReturnValue($value)
+    {
+        $this->returnValue = $value;
+    }
+
+    /**
+     * Get the most recent return value.
+     *
+     * @return mixed
+     */
+    public function getReturnValue()
+    {
+        return $this->returnValue;
+    }
+
+    /**
+     * Set the most recent Exception.
+     *
+     * @param \Exception $e
+     */
+    public function setLastException(\Exception $e)
+    {
+        $this->lastException = $e;
+    }
+
+    /**
+     * Get the most recent Exception.
+     *
+     * @throws \InvalidArgumentException If no Exception has been caught
+     *
+     * @return null|\Exception
+     */
+    public function getLastException()
+    {
+        if (!isset($this->lastException)) {
+            throw new \InvalidArgumentException('No most-recent exception');
+        }
+
+        return $this->lastException;
+    }
+
+    /**
+     * Set the most recent output from evaluated code.
+     *
+     * @param string $lastStdout
+     */
+    public function setLastStdout($lastStdout)
+    {
+        $this->lastStdout = $lastStdout;
+    }
+
+    /**
+     * Get the most recent output from evaluated code.
+     *
+     * @throws \InvalidArgumentException If no output has happened yet
+     *
+     * @return null|string
+     */
+    public function getLastStdout()
+    {
+        if (!isset($this->lastStdout)) {
+            throw new \InvalidArgumentException('No most-recent output');
+        }
+
+        return $this->lastStdout;
+    }
+
+    /**
+     * Set the bound object ($this variable) for the interactive shell.
+     *
+     * @param object|null $boundObject
+     */
+    public function setBoundObject($boundObject)
+    {
+        $this->boundObject = is_object($boundObject) ? $boundObject : null;
+    }
+
+    /**
+     * Get the bound object ($this variable) for the interactive shell.
+     *
+     * @return object|null
+     */
+    public function getBoundObject()
+    {
+        return $this->boundObject;
+    }
+
+    /**
+     * Set command-scope magic variables: $__class, $__file, etc.
+     *
+     * @param array $commandScopeVariables
+     */
+    public function setCommandScopeVariables(array $commandScopeVariables)
+    {
+        $vars = [];
+        foreach ($commandScopeVariables as $key => $value) {
+            // kind of type check
+            if (is_scalar($value) && in_array($key, self::$commandScopeNames)) {
+                $vars[$key] = $value;
+            }
+        }
+
+        $this->commandScopeVariables = $vars;
+    }
+
+    /**
+     * Get command-scope magic variables: $__class, $__file, etc.
+     *
+     * @return array
+     */
+    public function getCommandScopeVariables()
+    {
+        return $this->commandScopeVariables;
+    }
+
+    /**
+     * Get unused command-scope magic variables names: __class, __file, etc.
+     *
+     * This is used by the shell to unset old command-scope variables after a
+     * new batch is set.
+     *
+     * @return array Array of unused variable names
+     */
+    public function getUnusedCommandScopeVariableNames()
+    {
+        return array_diff(self::$commandScopeNames, array_keys($this->commandScopeVariables));
+    }
+
+    /**
+     * Check whether a variable name is a magic variable.
+     *
+     * @param string $name
+     *
+     * @return bool
+     */
+    public static function isSpecialVariableName($name)
+    {
+        return in_array($name, self::$specialNames) || in_array($name, self::$commandScopeNames);
+    }
+}