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vendor/psy/psysh/src/CodeCleaner.php

@@ -0,0 +1,349 @@
+<?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;
+
+use PhpParser\NodeTraverser;
+use PhpParser\Parser;
+use PhpParser\PrettyPrinter\Standard as Printer;
+use Psy\CodeCleaner\AbstractClassPass;
+use Psy\CodeCleaner\AssignThisVariablePass;
+use Psy\CodeCleaner\CalledClassPass;
+use Psy\CodeCleaner\CallTimePassByReferencePass;
+use Psy\CodeCleaner\ExitPass;
+use Psy\CodeCleaner\FinalClassPass;
+use Psy\CodeCleaner\FunctionContextPass;
+use Psy\CodeCleaner\FunctionReturnInWriteContextPass;
+use Psy\CodeCleaner\ImplicitReturnPass;
+use Psy\CodeCleaner\InstanceOfPass;
+use Psy\CodeCleaner\LeavePsyshAlonePass;
+use Psy\CodeCleaner\LegacyEmptyPass;
+use Psy\CodeCleaner\ListPass;
+use Psy\CodeCleaner\LoopContextPass;
+use Psy\CodeCleaner\MagicConstantsPass;
+use Psy\CodeCleaner\NamespacePass;
+use Psy\CodeCleaner\PassableByReferencePass;
+use Psy\CodeCleaner\RequirePass;
+use Psy\CodeCleaner\StrictTypesPass;
+use Psy\CodeCleaner\UseStatementPass;
+use Psy\CodeCleaner\ValidClassNamePass;
+use Psy\CodeCleaner\ValidConstantPass;
+use Psy\CodeCleaner\ValidConstructorPass;
+use Psy\CodeCleaner\ValidFunctionNamePass;
+use Psy\Exception\ParseErrorException;
+
+/**
+ * A service to clean up user input, detect parse errors before they happen,
+ * and generally work around issues with the PHP code evaluation experience.
+ */
+class CodeCleaner
+{
+    private $parser;
+    private $printer;
+    private $traverser;
+    private $namespace;
+
+    /**
+     * CodeCleaner constructor.
+     *
+     * @param Parser        $parser    A PhpParser Parser instance. One will be created if not explicitly supplied
+     * @param Printer       $printer   A PhpParser Printer instance. One will be created if not explicitly supplied
+     * @param NodeTraverser $traverser A PhpParser NodeTraverser instance. One will be created if not explicitly supplied
+     */
+    public function __construct(Parser $parser = null, Printer $printer = null, NodeTraverser $traverser = null)
+    {
+        if ($parser === null) {
+            $parserFactory = new ParserFactory();
+            $parser        = $parserFactory->createParser();
+        }
+
+        $this->parser    = $parser;
+        $this->printer   = $printer ?: new Printer();
+        $this->traverser = $traverser ?: new NodeTraverser();
+
+        foreach ($this->getDefaultPasses() as $pass) {
+            $this->traverser->addVisitor($pass);
+        }
+    }
+
+    /**
+     * Get default CodeCleaner passes.
+     *
+     * @return array
+     */
+    private function getDefaultPasses()
+    {
+        $useStatementPass = new UseStatementPass();
+        $namespacePass    = new NamespacePass($this);
+
+        // Try to add implicit `use` statements and an implicit namespace,
+        // based on the file in which the `debug` call was made.
+        $this->addImplicitDebugContext([$useStatementPass, $namespacePass]);
+
+        return [
+            // Validation passes
+            new AbstractClassPass(),
+            new AssignThisVariablePass(),
+            new CalledClassPass(),
+            new CallTimePassByReferencePass(),
+            new FinalClassPass(),
+            new FunctionContextPass(),
+            new FunctionReturnInWriteContextPass(),
+            new InstanceOfPass(),
+            new LeavePsyshAlonePass(),
+            new LegacyEmptyPass(),
+            new ListPass(),
+            new LoopContextPass(),
+            new PassableByReferencePass(),
+            new ValidConstructorPass(),
+
+            // Rewriting shenanigans
+            $useStatementPass,        // must run before the namespace pass
+            new ExitPass(),
+            new ImplicitReturnPass(),
+            new MagicConstantsPass(),
+            $namespacePass,           // must run after the implicit return pass
+            new RequirePass(),
+            new StrictTypesPass(),
+
+            // Namespace-aware validation (which depends on aforementioned shenanigans)
+            new ValidClassNamePass(),
+            new ValidConstantPass(),
+            new ValidFunctionNamePass(),
+        ];
+    }
+
+    /**
+     * "Warm up" code cleaner passes when we're coming from a debug call.
+     *
+     * This is useful, for example, for `UseStatementPass` and `NamespacePass`
+     * which keep track of state between calls, to maintain the current
+     * namespace and a map of use statements.
+     *
+     * @param array $passes
+     */
+    private function addImplicitDebugContext(array $passes)
+    {
+        $file = $this->getDebugFile();
+        if ($file === null) {
+            return;
+        }
+
+        try {
+            $code = @\file_get_contents($file);
+            if (!$code) {
+                return;
+            }
+
+            $stmts = $this->parse($code, true);
+            if ($stmts === false) {
+                return;
+            }
+
+            // Set up a clean traverser for just these code cleaner passes
+            $traverser = new NodeTraverser();
+            foreach ($passes as $pass) {
+                $traverser->addVisitor($pass);
+            }
+
+            $traverser->traverse($stmts);
+        } catch (\Throwable $e) {
+            // Don't care.
+        } catch (\Exception $e) {
+            // Still don't care.
+        }
+    }
+
+    /**
+     * Search the stack trace for a file in which the user called Psy\debug.
+     *
+     * @return string|null
+     */
+    private static function getDebugFile()
+    {
+        $trace = \debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
+
+        foreach (\array_reverse($trace) as $stackFrame) {
+            if (!self::isDebugCall($stackFrame)) {
+                continue;
+            }
+
+            if (\preg_match('/eval\(/', $stackFrame['file'])) {
+                \preg_match_all('/([^\(]+)\((\d+)/', $stackFrame['file'], $matches);
+
+                return $matches[1][0];
+            }
+
+            return $stackFrame['file'];
+        }
+    }
+
+    /**
+     * Check whether a given backtrace frame is a call to Psy\debug.
+     *
+     * @param array $stackFrame
+     *
+     * @return bool
+     */
+    private static function isDebugCall(array $stackFrame)
+    {
+        $class    = isset($stackFrame['class']) ? $stackFrame['class'] : null;
+        $function = isset($stackFrame['function']) ? $stackFrame['function'] : null;
+
+        return ($class === null && $function === 'Psy\debug') ||
+            ($class === 'Psy\Shell' && $function === 'debug');
+    }
+
+    /**
+     * Clean the given array of code.
+     *
+     * @throws ParseErrorException if the code is invalid PHP, and cannot be coerced into valid PHP
+     *
+     * @param array $codeLines
+     * @param bool  $requireSemicolons
+     *
+     * @return string|false Cleaned PHP code, False if the input is incomplete
+     */
+    public function clean(array $codeLines, $requireSemicolons = false)
+    {
+        $stmts = $this->parse('<?php ' . \implode(PHP_EOL, $codeLines) . PHP_EOL, $requireSemicolons);
+        if ($stmts === false) {
+            return false;
+        }
+
+        // Catch fatal errors before they happen
+        $stmts = $this->traverser->traverse($stmts);
+
+        // Work around https://github.com/nikic/PHP-Parser/issues/399
+        $oldLocale = \setlocale(LC_NUMERIC, 0);
+        \setlocale(LC_NUMERIC, 'C');
+
+        $code = $this->printer->prettyPrint($stmts);
+
+        // Now put the locale back
+        \setlocale(LC_NUMERIC, $oldLocale);
+
+        return $code;
+    }
+
+    /**
+     * Set the current local namespace.
+     *
+     * @param null|array $namespace (default: null)
+     *
+     * @return null|array
+     */
+    public function setNamespace(array $namespace = null)
+    {
+        $this->namespace = $namespace;
+    }
+
+    /**
+     * Get the current local namespace.
+     *
+     * @return null|array
+     */
+    public function getNamespace()
+    {
+        return $this->namespace;
+    }
+
+    /**
+     * Lex and parse a block of code.
+     *
+     * @see Parser::parse
+     *
+     * @throws ParseErrorException for parse errors that can't be resolved by
+     *                             waiting a line to see what comes next
+     *
+     * @param string $code
+     * @param bool   $requireSemicolons
+     *
+     * @return array|false A set of statements, or false if incomplete
+     */
+    protected function parse($code, $requireSemicolons = false)
+    {
+        try {
+            return $this->parser->parse($code);
+        } catch (\PhpParser\Error $e) {
+            if ($this->parseErrorIsUnclosedString($e, $code)) {
+                return false;
+            }
+
+            if ($this->parseErrorIsUnterminatedComment($e, $code)) {
+                return false;
+            }
+
+            if ($this->parseErrorIsTrailingComma($e, $code)) {
+                return false;
+            }
+
+            if (!$this->parseErrorIsEOF($e)) {
+                throw ParseErrorException::fromParseError($e);
+            }
+
+            if ($requireSemicolons) {
+                return false;
+            }
+
+            try {
+                // Unexpected EOF, try again with an implicit semicolon
+                return $this->parser->parse($code . ';');
+            } catch (\PhpParser\Error $e) {
+                return false;
+            }
+        }
+    }
+
+    private function parseErrorIsEOF(\PhpParser\Error $e)
+    {
+        $msg = $e->getRawMessage();
+
+        return ($msg === 'Unexpected token EOF') || (\strpos($msg, 'Syntax error, unexpected EOF') !== false);
+    }
+
+    /**
+     * A special test for unclosed single-quoted strings.
+     *
+     * Unlike (all?) other unclosed statements, single quoted strings have
+     * their own special beautiful snowflake syntax error just for
+     * themselves.
+     *
+     * @param \PhpParser\Error $e
+     * @param string           $code
+     *
+     * @return bool
+     */
+    private function parseErrorIsUnclosedString(\PhpParser\Error $e, $code)
+    {
+        if ($e->getRawMessage() !== 'Syntax error, unexpected T_ENCAPSED_AND_WHITESPACE') {
+            return false;
+        }
+
+        try {
+            $this->parser->parse($code . "';");
+        } catch (\Exception $e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private function parseErrorIsUnterminatedComment(\PhpParser\Error $e, $code)
+    {
+        return $e->getRawMessage() === 'Unterminated comment';
+    }
+
+    private function parseErrorIsTrailingComma(\PhpParser\Error $e, $code)
+    {
+        return ($e->getRawMessage() === 'A trailing comma is not allowed here') && (\substr(\rtrim($code), -1) === ',');
+    }
+}

vendor/psy/psysh/src/CodeCleaner/AbstractClassPass.php

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+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\ClassMethod;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * The abstract class pass handles abstract classes and methods, complaining if there are too few or too many of either.
+ */
+class AbstractClassPass extends CodeCleanerPass
+{
+    private $class;
+    private $abstractMethods;
+
+    /**
+     * @throws RuntimeException if the node is an abstract function with a body
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Class_) {
+            $this->class = $node;
+            $this->abstractMethods = [];
+        } elseif ($node instanceof ClassMethod) {
+            if ($node->isAbstract()) {
+                $name = \sprintf('%s::%s', $this->class->name, $node->name);
+                $this->abstractMethods[] = $name;
+
+                if ($node->stmts !== null) {
+                    $msg = \sprintf('Abstract function %s cannot contain body', $name);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                }
+            }
+        }
+    }
+
+    /**
+     * @throws RuntimeException if the node is a non-abstract class with abstract methods
+     *
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof Class_) {
+            $count = \count($this->abstractMethods);
+            if ($count > 0 && !$node->isAbstract()) {
+                $msg = \sprintf(
+                    'Class %s contains %d abstract method%s must therefore be declared abstract or implement the remaining methods (%s)',
+                    $node->name,
+                    $count,
+                    ($count === 1) ? '' : 's',
+                    \implode(', ', $this->abstractMethods)
+                );
+                throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+            }
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/AssignThisVariablePass.php

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+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\Variable;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that the user input does not assign the `$this` variable.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class AssignThisVariablePass extends CodeCleanerPass
+{
+    /**
+     * Validate that the user input does not assign the `$this` variable.
+     *
+     * @throws RuntimeException if the user assign the `$this` variable
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Assign && $node->var instanceof Variable && $node->var->name === 'this') {
+            throw new FatalErrorException('Cannot re-assign $this', 0, E_ERROR, null, $node->getLine());
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/CallTimePassByReferencePass.php

@@ -0,0 +1,50 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\StaticCall;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that the user did not use the call-time pass-by-reference that causes a fatal error.
+ *
+ * As of PHP 5.4.0, call-time pass-by-reference was removed, so using it will raise a fatal error.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class CallTimePassByReferencePass extends CodeCleanerPass
+{
+    const EXCEPTION_MESSAGE = 'Call-time pass-by-reference has been removed';
+
+    /**
+     * Validate of use call-time pass-by-reference.
+     *
+     * @throws RuntimeException if the user used call-time pass-by-reference
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if (!$node instanceof FuncCall && !$node instanceof MethodCall && !$node instanceof StaticCall) {
+            return;
+        }
+
+        foreach ($node->args as $arg) {
+            if ($arg->byRef) {
+                throw new FatalErrorException(self::EXCEPTION_MESSAGE, 0, E_ERROR, null, $node->getLine());
+            }
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/CalledClassPass.php

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+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Name;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\Trait_;
+use Psy\Exception\ErrorException;
+
+/**
+ * The called class pass throws warnings for get_class() and get_called_class()
+ * outside a class context.
+ */
+class CalledClassPass extends CodeCleanerPass
+{
+    private $inClass;
+
+    /**
+     * @param array $nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->inClass = false;
+    }
+
+    /**
+     * @throws ErrorException if get_class or get_called_class is called without an object from outside a class
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Class_ || $node instanceof Trait_) {
+            $this->inClass = true;
+        } elseif ($node instanceof FuncCall && !$this->inClass) {
+            // We'll give any args at all (besides null) a pass.
+            // Technically we should be checking whether the args are objects, but this will do for now.
+            //
+            // @todo switch this to actually validate args when we get context-aware code cleaner passes.
+            if (!empty($node->args) && !$this->isNull($node->args[0])) {
+                return;
+            }
+
+            // We'll ignore name expressions as well (things like `$foo()`)
+            if (!($node->name instanceof Name)) {
+                return;
+            }
+
+            $name = \strtolower($node->name);
+            if (\in_array($name, ['get_class', 'get_called_class'])) {
+                $msg = \sprintf('%s() called without object from outside a class', $name);
+                throw new ErrorException($msg, 0, E_USER_WARNING, null, $node->getLine());
+            }
+        }
+    }
+
+    /**
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof Class_) {
+            $this->inClass = false;
+        }
+    }
+
+    private function isNull(Node $node)
+    {
+        return $node->value instanceof ConstFetch && \strtolower($node->value->name) === 'null';
+    }
+}

vendor/psy/psysh/src/CodeCleaner/CodeCleanerPass.php

@@ -0,0 +1,22 @@
+<?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\CodeCleaner;
+
+use PhpParser\NodeVisitorAbstract;
+
+/**
+ * A CodeCleaner pass is a PhpParser Node Visitor.
+ */
+abstract class CodeCleanerPass extends NodeVisitorAbstract
+{
+    // Wheee!
+}

vendor/psy/psysh/src/CodeCleaner/ExitPass.php

@@ -0,0 +1,32 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Exit_;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+
+class ExitPass extends CodeCleanerPass
+{
+    /**
+     * Converts exit calls to BreakExceptions.
+     *
+     * @param \PhpParser\Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof Exit_) {
+            return new StaticCall(new FullyQualifiedName('Psy\Exception\BreakException'), 'exitShell');
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/FinalClassPass.php

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+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * The final class pass handles final classes.
+ */
+class FinalClassPass extends CodeCleanerPass
+{
+    private $finalClasses;
+
+    /**
+     * @param array $nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->finalClasses = [];
+    }
+
+    /**
+     * @throws RuntimeException if the node is a class that extends a final class
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Class_) {
+            if ($node->extends) {
+                $extends = (string) $node->extends;
+                if ($this->isFinalClass($extends)) {
+                    $msg = \sprintf('Class %s may not inherit from final class (%s)', $node->name, $extends);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                }
+            }
+
+            if ($node->isFinal()) {
+                $this->finalClasses[\strtolower($node->name)] = true;
+            }
+        }
+    }
+
+    /**
+     * @param string $name Class name
+     *
+     * @return bool
+     */
+    private function isFinalClass($name)
+    {
+        if (!\class_exists($name)) {
+            return isset($this->finalClasses[\strtolower($name)]);
+        }
+
+        $refl = new \ReflectionClass($name);
+
+        return $refl->isFinal();
+    }
+}

vendor/psy/psysh/src/CodeCleaner/FunctionContextPass.php

@@ -0,0 +1,61 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Yield_;
+use PhpParser\Node\FunctionLike;
+use Psy\Exception\FatalErrorException;
+
+class FunctionContextPass extends CodeCleanerPass
+{
+    /** @var int */
+    private $functionDepth;
+
+    /**
+     * @param array $nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->functionDepth = 0;
+    }
+
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof FunctionLike) {
+            $this->functionDepth++;
+
+            return;
+        }
+
+        // node is inside function context
+        if ($this->functionDepth !== 0) {
+            return;
+        }
+
+        // It causes fatal error.
+        if ($node instanceof Yield_) {
+            $msg = 'The "yield" expression can only be used inside a function';
+            throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+        }
+    }
+
+    /**
+     * @param \PhpParser\Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof FunctionLike) {
+            $this->functionDepth--;
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/FunctionReturnInWriteContextPass.php

@@ -0,0 +1,81 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Array_;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\Empty_;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Expr\Isset_;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Stmt\Unset_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that the functions are used correctly.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class FunctionReturnInWriteContextPass extends CodeCleanerPass
+{
+    const PHP55_MESSAGE = 'Cannot use isset() on the result of a function call (you can use "null !== func()" instead)';
+    const EXCEPTION_MESSAGE = "Can't use function return value in write context";
+
+    private $atLeastPhp55;
+
+    public function __construct()
+    {
+        $this->atLeastPhp55 = \version_compare(PHP_VERSION, '5.5', '>=');
+    }
+
+    /**
+     * Validate that the functions are used correctly.
+     *
+     * @throws FatalErrorException if a function is passed as an argument reference
+     * @throws FatalErrorException if a function is used as an argument in the isset
+     * @throws FatalErrorException if a function is used as an argument in the empty, only for PHP < 5.5
+     * @throws FatalErrorException if a value is assigned to a function
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Array_ || $this->isCallNode($node)) {
+            $items = $node instanceof Array_ ? $node->items : $node->args;
+            foreach ($items as $item) {
+                if ($item && $item->byRef && $this->isCallNode($item->value)) {
+                    throw new FatalErrorException(self::EXCEPTION_MESSAGE, 0, E_ERROR, null, $node->getLine());
+                }
+            }
+        } elseif ($node instanceof Isset_ || $node instanceof Unset_) {
+            foreach ($node->vars as $var) {
+                if (!$this->isCallNode($var)) {
+                    continue;
+                }
+
+                $msg = ($node instanceof Isset_ && $this->atLeastPhp55) ? self::PHP55_MESSAGE : self::EXCEPTION_MESSAGE;
+                throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+            }
+        } elseif ($node instanceof Empty_ && !$this->atLeastPhp55 && $this->isCallNode($node->expr)) {
+            throw new FatalErrorException(self::EXCEPTION_MESSAGE, 0, E_ERROR, null, $node->getLine()); // @codeCoverageIgnore
+        } elseif ($node instanceof Assign && $this->isCallNode($node->var)) {
+            throw new FatalErrorException(self::EXCEPTION_MESSAGE, 0, E_ERROR, null, $node->getLine());
+        }
+    }
+
+    private function isCallNode(Node $node)
+    {
+        return $node instanceof FuncCall || $node instanceof MethodCall || $node instanceof StaticCall;
+    }
+}

vendor/psy/psysh/src/CodeCleaner/ImplicitReturnPass.php

@@ -0,0 +1,128 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\Exit_;
+use PhpParser\Node\Stmt;
+use PhpParser\Node\Stmt\Break_;
+use PhpParser\Node\Stmt\Expression;
+use PhpParser\Node\Stmt\If_;
+use PhpParser\Node\Stmt\Namespace_;
+use PhpParser\Node\Stmt\Return_;
+use PhpParser\Node\Stmt\Switch_;
+
+/**
+ * Add an implicit "return" to the last statement, provided it can be returned.
+ */
+class ImplicitReturnPass extends CodeCleanerPass
+{
+    /**
+     * @param array $nodes
+     *
+     * @return array
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        return $this->addImplicitReturn($nodes);
+    }
+
+    /**
+     * @param array $nodes
+     *
+     * @return array
+     */
+    private function addImplicitReturn(array $nodes)
+    {
+        // If nodes is empty, it can't have a return value.
+        if (empty($nodes)) {
+            return [new Return_(NoReturnValue::create())];
+        }
+
+        $last = \end($nodes);
+
+        // Special case a few types of statements to add an implicit return
+        // value (even though they technically don't have any return value)
+        // because showing a return value in these instances is useful and not
+        // very surprising.
+        if ($last instanceof If_) {
+            $last->stmts = $this->addImplicitReturn($last->stmts);
+
+            foreach ($last->elseifs as $elseif) {
+                $elseif->stmts = $this->addImplicitReturn($elseif->stmts);
+            }
+
+            if ($last->else) {
+                $last->else->stmts = $this->addImplicitReturn($last->else->stmts);
+            }
+        } elseif ($last instanceof Switch_) {
+            foreach ($last->cases as $case) {
+                // only add an implicit return to cases which end in break
+                $caseLast = \end($case->stmts);
+                if ($caseLast instanceof Break_) {
+                    $case->stmts = $this->addImplicitReturn(\array_slice($case->stmts, 0, -1));
+                    $case->stmts[] = $caseLast;
+                }
+            }
+        } elseif ($last instanceof Expr && !($last instanceof Exit_)) {
+            // @codeCoverageIgnoreStart
+            $nodes[\count($nodes) - 1] = new Return_($last, [
+                'startLine' => $last->getLine(),
+                'endLine'   => $last->getLine(),
+            ]);
+        // @codeCoverageIgnoreEnd
+        } elseif ($last instanceof Expression && !($last->expr instanceof Exit_)) {
+            // For PHP Parser 4.x
+            $nodes[\count($nodes) - 1] = new Return_($last->expr, [
+                'startLine' => $last->getLine(),
+                'endLine'   => $last->getLine(),
+            ]);
+        } elseif ($last instanceof Namespace_) {
+            $last->stmts = $this->addImplicitReturn($last->stmts);
+        }
+
+        // Return a "no return value" for all non-expression statements, so that
+        // PsySH can suppress the `null` that `eval()` returns otherwise.
+        //
+        // Note that statements special cased above (if/elseif/else, switch)
+        // _might_ implicitly return a value before this catch-all return is
+        // reached.
+        //
+        // We're not adding a fallback return after namespace statements,
+        // because code outside namespace statements doesn't really work, and
+        // there's already an implicit return in the namespace statement anyway.
+        if (self::isNonExpressionStmt($last)) {
+            $nodes[] = new Return_(NoReturnValue::create());
+        }
+
+        return $nodes;
+    }
+
+    /**
+     * Check whether a given node is a non-expression statement.
+     *
+     * As of PHP Parser 4.x, Expressions are now instances of Stmt as well, so
+     * we'll exclude them here.
+     *
+     * @param Node $node
+     *
+     * @return bool
+     */
+    private static function isNonExpressionStmt(Node $node)
+    {
+        return $node instanceof Stmt &&
+            !$node instanceof Expression &&
+            !$node instanceof Return_ &&
+            !$node instanceof Namespace_;
+    }
+}

vendor/psy/psysh/src/CodeCleaner/InstanceOfPass.php

@@ -0,0 +1,47 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Expr\Instanceof_;
+use PhpParser\Node\Scalar;
+use PhpParser\Node\Scalar\Encapsed;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that the instanceof statement does not receive a scalar value or a non-class constant.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class InstanceOfPass extends CodeCleanerPass
+{
+    const EXCEPTION_MSG = 'instanceof expects an object instance, constant given';
+
+    /**
+     * Validate that the instanceof statement does not receive a scalar value or a non-class constant.
+     *
+     * @throws FatalErrorException if a scalar or a non-class constant is given
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if (!$node instanceof Instanceof_) {
+            return;
+        }
+
+        if (($node->expr instanceof Scalar && !$node->expr instanceof Encapsed) || $node->expr instanceof ConstFetch) {
+            throw new FatalErrorException(self::EXCEPTION_MSG, 0, E_ERROR, null, $node->getLine());
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/LeavePsyshAlonePass.php

@@ -0,0 +1,36 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Variable;
+use Psy\Exception\RuntimeException;
+
+/**
+ * Validate that the user input does not reference the `$__psysh__` variable.
+ */
+class LeavePsyshAlonePass extends CodeCleanerPass
+{
+    /**
+     * Validate that the user input does not reference the `$__psysh__` variable.
+     *
+     * @throws RuntimeException if the user is messing with $__psysh__
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Variable && $node->name === '__psysh__') {
+            throw new RuntimeException('Don\'t mess with $__psysh__; bad things will happen');
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/LegacyEmptyPass.php

@@ -0,0 +1,73 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Empty_;
+use PhpParser\Node\Expr\Variable;
+use Psy\Exception\ParseErrorException;
+
+/**
+ * Validate that the user did not call the language construct `empty()` on a
+ * statement in PHP < 5.5.
+ *
+ * @codeCoverageIgnore
+ */
+class LegacyEmptyPass extends CodeCleanerPass
+{
+    private $atLeastPhp55;
+
+    public function __construct()
+    {
+        $this->atLeastPhp55 = \version_compare(PHP_VERSION, '5.5', '>=');
+    }
+
+    /**
+     * Validate use of empty in PHP < 5.5.
+     *
+     * @throws ParseErrorException if the user used empty with anything but a variable
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($this->atLeastPhp55) {
+            return;
+        }
+
+        if (!$node instanceof Empty_) {
+            return;
+        }
+
+        if (!$node->expr instanceof Variable) {
+            $msg = \sprintf('syntax error, unexpected %s', $this->getUnexpectedThing($node->expr));
+
+            throw new ParseErrorException($msg, $node->expr->getLine());
+        }
+    }
+
+    private function getUnexpectedThing(Node $node)
+    {
+        switch ($node->getType()) {
+            case 'Scalar_String':
+            case 'Scalar_LNumber':
+            case 'Scalar_DNumber':
+                return \json_encode($node->value);
+
+            case 'Expr_ConstFetch':
+                return (string) $node->name;
+
+            default:
+                return $node->getType();
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/ListPass.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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\Array_;
+use PhpParser\Node\Expr\ArrayDimFetch;
+use PhpParser\Node\Expr\ArrayItem;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Expr\List_;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\PropertyFetch;
+use PhpParser\Node\Expr\Variable;
+use Psy\Exception\ParseErrorException;
+
+/**
+ * Validate that the list assignment.
+ */
+class ListPass extends CodeCleanerPass
+{
+    private $atLeastPhp71;
+
+    public function __construct()
+    {
+        $this->atLeastPhp71 = \version_compare(PHP_VERSION, '7.1', '>=');
+    }
+
+    /**
+     * Validate use of list assignment.
+     *
+     * @throws ParseErrorException if the user used empty with anything but a variable
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if (!$node instanceof Assign) {
+            return;
+        }
+
+        if (!$node->var instanceof Array_ && !$node->var instanceof List_) {
+            return;
+        }
+
+        if (!$this->atLeastPhp71 && $node->var instanceof Array_) {
+            $msg = "syntax error, unexpected '='";
+            throw new ParseErrorException($msg, $node->expr->getLine());
+        }
+
+        // Polyfill for PHP-Parser 2.x
+        $items = isset($node->var->items) ? $node->var->items : $node->var->vars;
+
+        if ($items === [] || $items === [null]) {
+            throw new ParseErrorException('Cannot use empty list', $node->var->getLine());
+        }
+
+        $itemFound = false;
+        foreach ($items as $item) {
+            if ($item === null) {
+                continue;
+            }
+
+            $itemFound = true;
+
+            // List_->$vars in PHP-Parser 2.x is Variable instead of ArrayItem.
+            if (!$this->atLeastPhp71 && $item instanceof ArrayItem && $item->key !== null) {
+                $msg = 'Syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting \',\' or \')\'';
+                throw new ParseErrorException($msg, $item->key->getLine());
+            }
+
+            if (!self::isValidArrayItem($item)) {
+                $msg = 'Assignments can only happen to writable values';
+                throw new ParseErrorException($msg, $item->getLine());
+            }
+        }
+
+        if (!$itemFound) {
+            throw new ParseErrorException('Cannot use empty list');
+        }
+    }
+
+    /**
+     * Validate whether a given item in an array is valid for short assignment.
+     *
+     * @param Expr $item
+     *
+     * @return bool
+     */
+    private static function isValidArrayItem(Expr $item)
+    {
+        $value = ($item instanceof ArrayItem) ? $item->value : $item;
+
+        while ($value instanceof ArrayDimFetch || $value instanceof PropertyFetch) {
+            $value = $value->var;
+        }
+
+        // We just kind of give up if it's a method call. We can't tell if it's
+        // valid via static analysis.
+        return $value instanceof Variable || $value instanceof MethodCall || $value instanceof FuncCall;
+    }
+}

vendor/psy/psysh/src/CodeCleaner/LoopContextPass.php

@@ -0,0 +1,103 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Scalar\DNumber;
+use PhpParser\Node\Scalar\LNumber;
+use PhpParser\Node\Stmt\Break_;
+use PhpParser\Node\Stmt\Continue_;
+use PhpParser\Node\Stmt\Do_;
+use PhpParser\Node\Stmt\For_;
+use PhpParser\Node\Stmt\Foreach_;
+use PhpParser\Node\Stmt\Switch_;
+use PhpParser\Node\Stmt\While_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * The loop context pass handles invalid `break` and `continue` statements.
+ */
+class LoopContextPass extends CodeCleanerPass
+{
+    private $loopDepth;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->loopDepth = 0;
+    }
+
+    /**
+     * @throws FatalErrorException if the node is a break or continue in a non-loop or switch context
+     * @throws FatalErrorException if the node is trying to break out of more nested structures than exist
+     * @throws FatalErrorException if the node is a break or continue and has a non-numeric argument
+     * @throws FatalErrorException if the node is a break or continue and has an argument less than 1
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        switch (true) {
+            case $node instanceof Do_:
+            case $node instanceof For_:
+            case $node instanceof Foreach_:
+            case $node instanceof Switch_:
+            case $node instanceof While_:
+                $this->loopDepth++;
+                break;
+
+            case $node instanceof Break_:
+            case $node instanceof Continue_:
+                $operator = $node instanceof Break_ ? 'break' : 'continue';
+
+                if ($this->loopDepth === 0) {
+                    $msg = \sprintf("'%s' not in the 'loop' or 'switch' context", $operator);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                }
+
+                if ($node->num instanceof LNumber || $node->num instanceof DNumber) {
+                    $num = $node->num->value;
+                    if ($node->num instanceof DNumber || $num < 1) {
+                        $msg = \sprintf("'%s' operator accepts only positive numbers", $operator);
+                        throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                    }
+
+                    if ($num > $this->loopDepth) {
+                        $msg = \sprintf("Cannot '%s' %d levels", $operator, $num);
+                        throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                    }
+                } elseif ($node->num) {
+                    $msg = \sprintf("'%s' operator with non-constant operand is no longer supported", $operator);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                }
+                break;
+        }
+    }
+
+    /**
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        switch (true) {
+            case $node instanceof Do_:
+            case $node instanceof For_:
+            case $node instanceof Foreach_:
+            case $node instanceof Switch_:
+            case $node instanceof While_:
+                $this->loopDepth--;
+                break;
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/MagicConstantsPass.php

@@ -0,0 +1,42 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Name;
+use PhpParser\Node\Scalar\MagicConst\Dir;
+use PhpParser\Node\Scalar\MagicConst\File;
+use PhpParser\Node\Scalar\String_;
+
+/**
+ * Swap out __DIR__ and __FILE__ magic constants with our best guess?
+ */
+class MagicConstantsPass extends CodeCleanerPass
+{
+    /**
+     * Swap out __DIR__ and __FILE__ constants, because the default ones when
+     * calling eval() don't make sense.
+     *
+     * @param Node $node
+     *
+     * @return null|FuncCall|String_
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Dir) {
+            return new FuncCall(new Name('getcwd'), [], $node->getAttributes());
+        } elseif ($node instanceof File) {
+            return new String_('', $node->getAttributes());
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/NamespaceAwarePass.php

@@ -0,0 +1,71 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Name;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+use PhpParser\Node\Stmt\Namespace_;
+
+/**
+ * Abstract namespace-aware code cleaner pass.
+ */
+abstract class NamespaceAwarePass extends CodeCleanerPass
+{
+    protected $namespace;
+    protected $currentScope;
+
+    /**
+     * @todo should this be final? Extending classes should be sure to either
+     * use afterTraverse or call parent::beforeTraverse() when overloading.
+     *
+     * Reset the namespace and the current scope before beginning analysis
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->namespace    = [];
+        $this->currentScope = [];
+    }
+
+    /**
+     * @todo should this be final? Extending classes should be sure to either use
+     * leaveNode or call parent::enterNode() when overloading
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Namespace_) {
+            $this->namespace = isset($node->name) ? $node->name->parts : [];
+        }
+    }
+
+    /**
+     * Get a fully-qualified name (class, function, interface, etc).
+     *
+     * @param mixed $name
+     *
+     * @return string
+     */
+    protected function getFullyQualifiedName($name)
+    {
+        if ($name instanceof FullyQualifiedName) {
+            return \implode('\\', $name->parts);
+        } elseif ($name instanceof Name) {
+            $name = $name->parts;
+        } elseif (!\is_array($name)) {
+            $name = [$name];
+        }
+
+        return \implode('\\', \array_merge($this->namespace, $name));
+    }
+}

vendor/psy/psysh/src/CodeCleaner/NamespacePass.php

@@ -0,0 +1,88 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node\Name;
+use PhpParser\Node\Stmt\Namespace_;
+use Psy\CodeCleaner;
+
+/**
+ * Provide implicit namespaces for subsequent execution.
+ *
+ * The namespace pass remembers the last standalone namespace line encountered:
+ *
+ *     namespace Foo\Bar;
+ *
+ * ... which it then applies implicitly to all future evaluated code, until the
+ * namespace is replaced by another namespace. To reset to the top level
+ * namespace, enter `namespace {}`. This is a bit ugly, but it does the trick :)
+ */
+class NamespacePass extends CodeCleanerPass
+{
+    private $namespace = null;
+    private $cleaner;
+
+    /**
+     * @param CodeCleaner $cleaner
+     */
+    public function __construct(CodeCleaner $cleaner)
+    {
+        $this->cleaner = $cleaner;
+    }
+
+    /**
+     * If this is a standalone namespace line, remember it for later.
+     *
+     * Otherwise, apply remembered namespaces to the code until a new namespace
+     * is encountered.
+     *
+     * @param array $nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        if (empty($nodes)) {
+            return $nodes;
+        }
+
+        $last = \end($nodes);
+
+        if ($last instanceof Namespace_) {
+            $kind = $last->getAttribute('kind');
+
+            // Treat all namespace statements pre-PHP-Parser v3.1.2 as "open",
+            // even though we really have no way of knowing.
+            if ($kind === null || $kind === Namespace_::KIND_SEMICOLON) {
+                // Save the current namespace for open namespaces
+                $this->setNamespace($last->name);
+            } else {
+                // Clear the current namespace after a braced namespace
+                $this->setNamespace(null);
+            }
+
+            return $nodes;
+        }
+
+        return $this->namespace ? [new Namespace_($this->namespace, $nodes)] : $nodes;
+    }
+
+    /**
+     * Remember the namespace and (re)set the namespace on the CodeCleaner as
+     * well.
+     *
+     * @param null|Name $namespace
+     */
+    private function setNamespace($namespace)
+    {
+        $this->namespace = $namespace;
+        $this->cleaner->setNamespace($namespace === null ? null : $namespace->parts);
+    }
+}

vendor/psy/psysh/src/CodeCleaner/NoReturnValue.php

@@ -0,0 +1,35 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node\Expr\New_;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+
+/**
+ * A class used internally by CodeCleaner to represent input, such as
+ * non-expression statements, with no return value.
+ *
+ * Note that user code returning an instance of this class will act like it
+ * has no return value, so you prolly shouldn't do that.
+ */
+class NoReturnValue
+{
+    /**
+     * Get PhpParser AST expression for creating a new NoReturnValue.
+     *
+     * @return PhpParser\Node\Expr\New_
+     */
+    public static function create()
+    {
+        return new New_(new FullyQualifiedName('Psy\CodeCleaner\NoReturnValue'));
+    }
+}

vendor/psy/psysh/src/CodeCleaner/PassableByReferencePass.php

@@ -0,0 +1,109 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\PropertyFetch;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Expr\Variable;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that only variables (and variable-like things) are passed by reference.
+ */
+class PassableByReferencePass extends CodeCleanerPass
+{
+    const EXCEPTION_MESSAGE = 'Only variables can be passed by reference';
+
+    /**
+     * @throws FatalErrorException if non-variables are passed by reference
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        // @todo support MethodCall and StaticCall as well.
+        if ($node instanceof FuncCall) {
+            // if function name is an expression or a variable, give it a pass for now.
+            if ($node->name instanceof Expr || $node->name instanceof Variable) {
+                return;
+            }
+
+            $name = (string) $node->name;
+
+            if ($name === 'array_multisort') {
+                return $this->validateArrayMultisort($node);
+            }
+
+            try {
+                $refl = new \ReflectionFunction($name);
+            } catch (\ReflectionException $e) {
+                // Well, we gave it a shot!
+                return;
+            }
+
+            foreach ($refl->getParameters() as $key => $param) {
+                if (\array_key_exists($key, $node->args)) {
+                    $arg = $node->args[$key];
+                    if ($param->isPassedByReference() && !$this->isPassableByReference($arg)) {
+                        throw new FatalErrorException(self::EXCEPTION_MESSAGE, 0, E_ERROR, null, $node->getLine());
+                    }
+                }
+            }
+        }
+    }
+
+    private function isPassableByReference(Node $arg)
+    {
+        // FuncCall, MethodCall and StaticCall are all PHP _warnings_ not fatal errors, so we'll let
+        // PHP handle those ones :)
+        return $arg->value instanceof ClassConstFetch ||
+            $arg->value instanceof PropertyFetch ||
+            $arg->value instanceof Variable ||
+            $arg->value instanceof FuncCall ||
+            $arg->value instanceof MethodCall ||
+            $arg->value instanceof StaticCall;
+    }
+
+    /**
+     * Because array_multisort has a problematic signature...
+     *
+     * The argument order is all sorts of wonky, and whether something is passed
+     * by reference or not depends on the values of the two arguments before it.
+     * We'll do a good faith attempt at validating this, but err on the side of
+     * permissive.
+     *
+     * This is why you don't design languages where core code and extensions can
+     * implement APIs that wouldn't be possible in userland code.
+     *
+     * @throws FatalErrorException for clearly invalid arguments
+     *
+     * @param Node $node
+     */
+    private function validateArrayMultisort(Node $node)
+    {
+        $nonPassable = 2; // start with 2 because the first one has to be passable by reference
+        foreach ($node->args as $arg) {
+            if ($this->isPassableByReference($arg)) {
+                $nonPassable = 0;
+            } elseif (++$nonPassable > 2) {
+                // There can be *at most* two non-passable-by-reference args in a row. This is about
+                // as close as we can get to validating the arguments for this function :-/
+                throw new FatalErrorException(self::EXCEPTION_MESSAGE, 0, E_ERROR, null, $node->getLine());
+            }
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/RequirePass.php

@@ -0,0 +1,101 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Arg;
+use PhpParser\Node\Expr\Include_;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+use PhpParser\Node\Scalar\LNumber;
+use Psy\Exception\ErrorException;
+use Psy\Exception\FatalErrorException;
+use Psy\Shell;
+
+/**
+ * Add runtime validation for `require` and `require_once` calls.
+ */
+class RequirePass extends CodeCleanerPass
+{
+    private static $requireTypes = [Include_::TYPE_REQUIRE, Include_::TYPE_REQUIRE_ONCE];
+
+    /**
+     * {@inheritdoc}
+     */
+    public function enterNode(Node $origNode)
+    {
+        if (!$this->isRequireNode($origNode)) {
+            return;
+        }
+
+        $node = clone $origNode;
+
+        /*
+         * rewrite
+         *
+         *   $foo = require $bar
+         *
+         * to
+         *
+         *   $foo = require \Psy\CodeCleaner\RequirePass::resolve($bar)
+         */
+        $node->expr = new StaticCall(
+            new FullyQualifiedName('Psy\CodeCleaner\RequirePass'),
+            'resolve',
+            [new Arg($origNode->expr), new Arg(new LNumber($origNode->getLine()))],
+            $origNode->getAttributes()
+        );
+
+        return $node;
+    }
+
+    /**
+     * Runtime validation that $file can be resolved as an include path.
+     *
+     * If $file can be resolved, return $file. Otherwise throw a fatal error exception.
+     *
+     * @throws FatalErrorException when unable to resolve include path for $file
+     * @throws ErrorException      if $file is empty and E_WARNING is included in error_reporting level
+     *
+     * @param string $file
+     * @param int    $lineNumber Line number of the original require expression
+     *
+     * @return string Exactly the same as $file
+     */
+    public static function resolve($file, $lineNumber = null)
+    {
+        $file = (string) $file;
+
+        if ($file === '') {
+            // @todo Shell::handleError would be better here, because we could
+            // fake the file and line number, but we can't call it statically.
+            // So we're duplicating some of the logics here.
+            if (E_WARNING & \error_reporting()) {
+                ErrorException::throwException(E_WARNING, 'Filename cannot be empty', null, $lineNumber);
+            }
+            // @todo trigger an error as fallback? this is pretty ugly…
+            // trigger_error('Filename cannot be empty', E_USER_WARNING);
+        }
+
+        if ($file === '' || !\stream_resolve_include_path($file)) {
+            $msg = \sprintf("Failed opening required '%s'", $file);
+            throw new FatalErrorException($msg, 0, E_ERROR, null, $lineNumber);
+        }
+
+        return $file;
+    }
+
+    private function isRequireNode(Node $node)
+    {
+        return $node instanceof Include_ && \in_array($node->type, self::$requireTypes);
+    }
+}

vendor/psy/psysh/src/CodeCleaner/StrictTypesPass.php

@@ -0,0 +1,87 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node\Identifier;
+use PhpParser\Node\Scalar\LNumber;
+use PhpParser\Node\Stmt\Declare_;
+use PhpParser\Node\Stmt\DeclareDeclare;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Provide implicit strict types declarations for for subsequent execution.
+ *
+ * The strict types pass remembers the last strict types declaration:
+ *
+ *     declare(strict_types=1);
+ *
+ * ... which it then applies implicitly to all future evaluated code, until it
+ * is replaced by a new declaration.
+ */
+class StrictTypesPass extends CodeCleanerPass
+{
+    const EXCEPTION_MESSAGE = 'strict_types declaration must have 0 or 1 as its value';
+
+    private $strictTypes = false;
+    private $atLeastPhp7;
+
+    public function __construct()
+    {
+        $this->atLeastPhp7 = \version_compare(PHP_VERSION, '7.0', '>=');
+    }
+
+    /**
+     * If this is a standalone strict types declaration, remember it for later.
+     *
+     * Otherwise, apply remembered strict types declaration to to the code until
+     * a new declaration is encountered.
+     *
+     * @throws FatalErrorException if an invalid `strict_types` declaration is found
+     *
+     * @param array $nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        if (!$this->atLeastPhp7) {
+            return; // @codeCoverageIgnore
+        }
+
+        $prependStrictTypes = $this->strictTypes;
+
+        foreach ($nodes as $key => $node) {
+            if ($node instanceof Declare_) {
+                foreach ($node->declares as $declare) {
+                    // For PHP Parser 4.x
+                    $declareKey = $declare->key instanceof Identifier ? $declare->key->toString() : $declare->key;
+                    if ($declareKey === 'strict_types') {
+                        $value = $declare->value;
+                        if (!$value instanceof LNumber || ($value->value !== 0 && $value->value !== 1)) {
+                            throw new FatalErrorException(self::EXCEPTION_MESSAGE, 0, E_ERROR, null, $node->getLine());
+                        }
+
+                        $this->strictTypes = $value->value === 1;
+                    }
+                }
+            }
+        }
+
+        if ($prependStrictTypes) {
+            $first = \reset($nodes);
+            if (!$first instanceof Declare_) {
+                $declare = new Declare_([new DeclareDeclare('strict_types', new LNumber(1))]);
+                \array_unshift($nodes, $declare);
+            }
+        }
+
+        return $nodes;
+    }
+}

vendor/psy/psysh/src/CodeCleaner/UseStatementPass.php

@@ -0,0 +1,126 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Name;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+use PhpParser\Node\Stmt\GroupUse;
+use PhpParser\Node\Stmt\Namespace_;
+use PhpParser\Node\Stmt\Use_;
+use PhpParser\NodeTraverser;
+
+/**
+ * Provide implicit use statements for subsequent execution.
+ *
+ * The use statement pass remembers the last use statement line encountered:
+ *
+ *     use Foo\Bar as Baz;
+ *
+ * ... which it then applies implicitly to all future evaluated code, until the
+ * current namespace is replaced by another namespace.
+ */
+class UseStatementPass extends CodeCleanerPass
+{
+    private $aliases       = [];
+    private $lastAliases   = [];
+    private $lastNamespace = null;
+
+    /**
+     * Re-load the last set of use statements on re-entering a namespace.
+     *
+     * This isn't how namespaces normally work, but because PsySH has to spin
+     * up a new namespace for every line of code, we do this to make things
+     * work like you'd expect.
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Namespace_) {
+            // If this is the same namespace as last namespace, let's do ourselves
+            // a favor and reload all the aliases...
+            if (\strtolower($node->name) === \strtolower($this->lastNamespace)) {
+                $this->aliases = $this->lastAliases;
+            }
+        }
+    }
+
+    /**
+     * If this statement is a namespace, forget all the aliases we had.
+     *
+     * If it's a use statement, remember the alias for later. Otherwise, apply
+     * remembered aliases to the code.
+     *
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof Use_) {
+            // Store a reference to every "use" statement, because we'll need
+            // them in a bit.
+            foreach ($node->uses as $use) {
+                $alias = $use->alias ?: \end($use->name->parts);
+                $this->aliases[\strtolower($alias)] = $use->name;
+            }
+
+            return NodeTraverser::REMOVE_NODE;
+        } elseif ($node instanceof GroupUse) {
+            // Expand every "use" statement in the group into a full, standalone
+            // "use" and store 'em with the others.
+            foreach ($node->uses as $use) {
+                $alias = $use->alias ?: \end($use->name->parts);
+                $this->aliases[\strtolower($alias)] = Name::concat($node->prefix, $use->name, [
+                    'startLine' => $node->prefix->getAttribute('startLine'),
+                    'endLine'   => $use->name->getAttribute('endLine'),
+                ]);
+            }
+
+            return NodeTraverser::REMOVE_NODE;
+        } elseif ($node instanceof Namespace_) {
+            // Start fresh, since we're done with this namespace.
+            $this->lastNamespace = $node->name;
+            $this->lastAliases   = $this->aliases;
+            $this->aliases       = [];
+        } else {
+            foreach ($node as $name => $subNode) {
+                if ($subNode instanceof Name) {
+                    // Implicitly thunk all aliases.
+                    if ($replacement = $this->findAlias($subNode)) {
+                        $node->$name = $replacement;
+                    }
+                }
+            }
+
+            return $node;
+        }
+    }
+
+    /**
+     * Find class/namespace aliases.
+     *
+     * @param Name $name
+     *
+     * @return FullyQualifiedName|null
+     */
+    private function findAlias(Name $name)
+    {
+        $that = \strtolower($name);
+        foreach ($this->aliases as $alias => $prefix) {
+            if ($that === $alias) {
+                return new FullyQualifiedName($prefix->toString());
+            } elseif (\substr($that, 0, \strlen($alias) + 1) === $alias . '\\') {
+                return new FullyQualifiedName($prefix->toString() . \substr($name, \strlen($alias)));
+            }
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/ValidClassNamePass.php

@@ -0,0 +1,411 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\New_;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Stmt;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\Do_;
+use PhpParser\Node\Stmt\If_;
+use PhpParser\Node\Stmt\Interface_;
+use PhpParser\Node\Stmt\Switch_;
+use PhpParser\Node\Stmt\Trait_;
+use PhpParser\Node\Stmt\While_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that classes exist.
+ *
+ * This pass throws a FatalErrorException rather than letting PHP run
+ * headfirst into a real fatal error and die.
+ */
+class ValidClassNamePass extends NamespaceAwarePass
+{
+    const CLASS_TYPE     = 'class';
+    const INTERFACE_TYPE = 'interface';
+    const TRAIT_TYPE     = 'trait';
+
+    private $conditionalScopes = 0;
+    private $atLeastPhp55;
+
+    public function __construct()
+    {
+        $this->atLeastPhp55 = \version_compare(PHP_VERSION, '5.5', '>=');
+    }
+
+    /**
+     * Validate class, interface and trait definitions.
+     *
+     * Validate them upon entering the node, so that we know about their
+     * presence and can validate constant fetches and static calls in class or
+     * trait methods.
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        parent::enterNode($node);
+
+        if (self::isConditional($node)) {
+            $this->conditionalScopes++;
+        } else {
+            // @todo add an "else" here which adds a runtime check for instances where we can't tell
+            // whether a class is being redefined by static analysis alone.
+            if ($this->conditionalScopes === 0) {
+                if ($node instanceof Class_) {
+                    $this->validateClassStatement($node);
+                } elseif ($node instanceof Interface_) {
+                    $this->validateInterfaceStatement($node);
+                } elseif ($node instanceof Trait_) {
+                    $this->validateTraitStatement($node);
+                }
+            }
+        }
+    }
+
+    /**
+     * Validate `new` expressions, class constant fetches, and static calls.
+     *
+     * @throws FatalErrorException if a class, interface or trait is referenced which does not exist
+     * @throws FatalErrorException if a class extends something that is not a class
+     * @throws FatalErrorException if a class implements something that is not an interface
+     * @throws FatalErrorException if an interface extends something that is not an interface
+     * @throws FatalErrorException if a class, interface or trait redefines an existing class, interface or trait name
+     *
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if (self::isConditional($node)) {
+            $this->conditionalScopes--;
+        } elseif ($node instanceof New_) {
+            $this->validateNewExpression($node);
+        } elseif ($node instanceof ClassConstFetch) {
+            $this->validateClassConstFetchExpression($node);
+        } elseif ($node instanceof StaticCall) {
+            $this->validateStaticCallExpression($node);
+        }
+    }
+
+    private static function isConditional(Node $node)
+    {
+        return $node instanceof If_ ||
+            $node instanceof While_ ||
+            $node instanceof Do_ ||
+            $node instanceof Switch_;
+    }
+
+    /**
+     * Validate a class definition statement.
+     *
+     * @param Class_ $stmt
+     */
+    protected function validateClassStatement(Class_ $stmt)
+    {
+        $this->ensureCanDefine($stmt, self::CLASS_TYPE);
+        if (isset($stmt->extends)) {
+            $this->ensureClassExists($this->getFullyQualifiedName($stmt->extends), $stmt);
+        }
+        $this->ensureInterfacesExist($stmt->implements, $stmt);
+    }
+
+    /**
+     * Validate an interface definition statement.
+     *
+     * @param Interface_ $stmt
+     */
+    protected function validateInterfaceStatement(Interface_ $stmt)
+    {
+        $this->ensureCanDefine($stmt, self::INTERFACE_TYPE);
+        $this->ensureInterfacesExist($stmt->extends, $stmt);
+    }
+
+    /**
+     * Validate a trait definition statement.
+     *
+     * @param Trait_ $stmt
+     */
+    protected function validateTraitStatement(Trait_ $stmt)
+    {
+        $this->ensureCanDefine($stmt, self::TRAIT_TYPE);
+    }
+
+    /**
+     * Validate a `new` expression.
+     *
+     * @param New_ $stmt
+     */
+    protected function validateNewExpression(New_ $stmt)
+    {
+        // if class name is an expression or an anonymous class, give it a pass for now
+        if (!$stmt->class instanceof Expr && !$stmt->class instanceof Class_) {
+            $this->ensureClassExists($this->getFullyQualifiedName($stmt->class), $stmt);
+        }
+    }
+
+    /**
+     * Validate a class constant fetch expression's class.
+     *
+     * @param ClassConstFetch $stmt
+     */
+    protected function validateClassConstFetchExpression(ClassConstFetch $stmt)
+    {
+        // there is no need to check exists for ::class const for php 5.5 or newer
+        if (\strtolower($stmt->name) === 'class' && $this->atLeastPhp55) {
+            return;
+        }
+
+        // if class name is an expression, give it a pass for now
+        if (!$stmt->class instanceof Expr) {
+            $this->ensureClassOrInterfaceExists($this->getFullyQualifiedName($stmt->class), $stmt);
+        }
+    }
+
+    /**
+     * Validate a class constant fetch expression's class.
+     *
+     * @param StaticCall $stmt
+     */
+    protected function validateStaticCallExpression(StaticCall $stmt)
+    {
+        // if class name is an expression, give it a pass for now
+        if (!$stmt->class instanceof Expr) {
+            $this->ensureMethodExists($this->getFullyQualifiedName($stmt->class), $stmt->name, $stmt);
+        }
+    }
+
+    /**
+     * Ensure that no class, interface or trait name collides with a new definition.
+     *
+     * @throws FatalErrorException
+     *
+     * @param Stmt   $stmt
+     * @param string $scopeType
+     */
+    protected function ensureCanDefine(Stmt $stmt, $scopeType = self::CLASS_TYPE)
+    {
+        $name = $this->getFullyQualifiedName($stmt->name);
+
+        // check for name collisions
+        $errorType = null;
+        if ($this->classExists($name)) {
+            $errorType = self::CLASS_TYPE;
+        } elseif ($this->interfaceExists($name)) {
+            $errorType = self::INTERFACE_TYPE;
+        } elseif ($this->traitExists($name)) {
+            $errorType = self::TRAIT_TYPE;
+        }
+
+        if ($errorType !== null) {
+            throw $this->createError(\sprintf('%s named %s already exists', \ucfirst($errorType), $name), $stmt);
+        }
+
+        // Store creation for the rest of this code snippet so we can find local
+        // issue too
+        $this->currentScope[\strtolower($name)] = $scopeType;
+    }
+
+    /**
+     * Ensure that a referenced class exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param string $name
+     * @param Stmt   $stmt
+     */
+    protected function ensureClassExists($name, $stmt)
+    {
+        if (!$this->classExists($name)) {
+            throw $this->createError(\sprintf('Class \'%s\' not found', $name), $stmt);
+        }
+    }
+
+    /**
+     * Ensure that a referenced class _or interface_ exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param string $name
+     * @param Stmt   $stmt
+     */
+    protected function ensureClassOrInterfaceExists($name, $stmt)
+    {
+        if (!$this->classExists($name) && !$this->interfaceExists($name)) {
+            throw $this->createError(\sprintf('Class \'%s\' not found', $name), $stmt);
+        }
+    }
+
+    /**
+     * Ensure that a referenced class _or trait_ exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param string $name
+     * @param Stmt   $stmt
+     */
+    protected function ensureClassOrTraitExists($name, $stmt)
+    {
+        if (!$this->classExists($name) && !$this->traitExists($name)) {
+            throw $this->createError(\sprintf('Class \'%s\' not found', $name), $stmt);
+        }
+    }
+
+    /**
+     * Ensure that a statically called method exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param string $class
+     * @param string $name
+     * @param Stmt   $stmt
+     */
+    protected function ensureMethodExists($class, $name, $stmt)
+    {
+        $this->ensureClassOrTraitExists($class, $stmt);
+
+        // let's pretend all calls to self, parent and static are valid
+        if (\in_array(\strtolower($class), ['self', 'parent', 'static'])) {
+            return;
+        }
+
+        // ... and all calls to classes defined right now
+        if ($this->findInScope($class) === self::CLASS_TYPE) {
+            return;
+        }
+
+        // if method name is an expression, give it a pass for now
+        if ($name instanceof Expr) {
+            return;
+        }
+
+        if (!\method_exists($class, $name) && !\method_exists($class, '__callStatic')) {
+            throw $this->createError(\sprintf('Call to undefined method %s::%s()', $class, $name), $stmt);
+        }
+    }
+
+    /**
+     * Ensure that a referenced interface exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param Interface_[] $interfaces
+     * @param Stmt         $stmt
+     */
+    protected function ensureInterfacesExist($interfaces, $stmt)
+    {
+        foreach ($interfaces as $interface) {
+            /** @var string $name */
+            $name = $this->getFullyQualifiedName($interface);
+            if (!$this->interfaceExists($name)) {
+                throw $this->createError(\sprintf('Interface \'%s\' not found', $name), $stmt);
+            }
+        }
+    }
+
+    /**
+     * Get a symbol type key for storing in the scope name cache.
+     *
+     * @deprecated No longer used. Scope type should be passed into ensureCanDefine directly.
+     * @codeCoverageIgnore
+     *
+     * @param Stmt $stmt
+     *
+     * @return string
+     */
+    protected function getScopeType(Stmt $stmt)
+    {
+        if ($stmt instanceof Class_) {
+            return self::CLASS_TYPE;
+        } elseif ($stmt instanceof Interface_) {
+            return self::INTERFACE_TYPE;
+        } elseif ($stmt instanceof Trait_) {
+            return self::TRAIT_TYPE;
+        }
+    }
+
+    /**
+     * Check whether a class exists, or has been defined in the current code snippet.
+     *
+     * Gives `self`, `static` and `parent` a free pass.
+     *
+     * @param string $name
+     *
+     * @return bool
+     */
+    protected function classExists($name)
+    {
+        // Give `self`, `static` and `parent` a pass. This will actually let
+        // some errors through, since we're not checking whether the keyword is
+        // being used in a class scope.
+        if (\in_array(\strtolower($name), ['self', 'static', 'parent'])) {
+            return true;
+        }
+
+        return \class_exists($name) || $this->findInScope($name) === self::CLASS_TYPE;
+    }
+
+    /**
+     * Check whether an interface exists, or has been defined in the current code snippet.
+     *
+     * @param string $name
+     *
+     * @return bool
+     */
+    protected function interfaceExists($name)
+    {
+        return \interface_exists($name) || $this->findInScope($name) === self::INTERFACE_TYPE;
+    }
+
+    /**
+     * Check whether a trait exists, or has been defined in the current code snippet.
+     *
+     * @param string $name
+     *
+     * @return bool
+     */
+    protected function traitExists($name)
+    {
+        return \trait_exists($name) || $this->findInScope($name) === self::TRAIT_TYPE;
+    }
+
+    /**
+     * Find a symbol in the current code snippet scope.
+     *
+     * @param string $name
+     *
+     * @return string|null
+     */
+    protected function findInScope($name)
+    {
+        $name = \strtolower($name);
+        if (isset($this->currentScope[$name])) {
+            return $this->currentScope[$name];
+        }
+    }
+
+    /**
+     * Error creation factory.
+     *
+     * @param string $msg
+     * @param Stmt   $stmt
+     *
+     * @return FatalErrorException
+     */
+    protected function createError($msg, $stmt)
+    {
+        return new FatalErrorException($msg, 0, E_ERROR, null, $stmt->getLine());
+    }
+}

vendor/psy/psysh/src/CodeCleaner/ValidConstantPass.php

@@ -0,0 +1,90 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Identifier;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that namespaced constant references will succeed.
+ *
+ * This pass throws a FatalErrorException rather than letting PHP run
+ * headfirst into a real fatal error and die.
+ *
+ * @todo Detect constants defined in the current code snippet?
+ *       ... Might not be worth it, since it would need to both be defining and
+ *       referencing a namespaced constant, which doesn't seem like that big of
+ *       a target for failure
+ */
+class ValidConstantPass extends NamespaceAwarePass
+{
+    /**
+     * Validate that namespaced constant references will succeed.
+     *
+     * Note that this does not (yet) detect constants defined in the current code
+     * snippet. It won't happen very often, so we'll punt for now.
+     *
+     * @throws FatalErrorException if a constant reference is not defined
+     *
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof ConstFetch && \count($node->name->parts) > 1) {
+            $name = $this->getFullyQualifiedName($node->name);
+            if (!\defined($name)) {
+                $msg = \sprintf('Undefined constant %s', $name);
+                throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+            }
+        } elseif ($node instanceof ClassConstFetch) {
+            $this->validateClassConstFetchExpression($node);
+        }
+    }
+
+    /**
+     * Validate a class constant fetch expression.
+     *
+     * @throws FatalErrorException if a class constant is not defined
+     *
+     * @param ClassConstFetch $stmt
+     */
+    protected function validateClassConstFetchExpression(ClassConstFetch $stmt)
+    {
+        // For PHP Parser 4.x
+        $constName = $stmt->name instanceof Identifier ? $stmt->name->toString() : $stmt->name;
+
+        // give the `class` pseudo-constant a pass
+        if ($constName === 'class') {
+            return;
+        }
+
+        // if class name is an expression, give it a pass for now
+        if (!$stmt->class instanceof Expr) {
+            $className = $this->getFullyQualifiedName($stmt->class);
+
+            // if the class doesn't exist, don't throw an exception… it might be
+            // defined in the same line it's used or something stupid like that.
+            if (\class_exists($className) || \interface_exists($className)) {
+                $refl = new \ReflectionClass($className);
+                if (!$refl->hasConstant($constName)) {
+                    $constType = \class_exists($className) ? 'Class' : 'Interface';
+                    $msg = \sprintf('%s constant \'%s::%s\' not found', $constType, $className, $constName);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $stmt->getLine());
+                }
+            }
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/ValidConstructorPass.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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Identifier;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\ClassMethod;
+use PhpParser\Node\Stmt\Namespace_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that the constructor method is not static, and does not have a
+ * return type.
+ *
+ * Checks both explicit __construct methods as well as old-style constructor
+ * methods with the same name as the class (for non-namespaced classes).
+ *
+ * As of PHP 5.3.3, methods with the same name as the last element of a
+ * namespaced class name will no longer be treated as constructor. This change
+ * doesn't affect non-namespaced classes.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class ValidConstructorPass extends CodeCleanerPass
+{
+    private $namespace;
+
+    public function beforeTraverse(array $nodes)
+    {
+        $this->namespace = [];
+    }
+
+    /**
+     * Validate that the constructor is not static and does not have a return type.
+     *
+     * @throws FatalErrorException the constructor function is static
+     * @throws FatalErrorException the constructor function has a return type
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Namespace_) {
+            $this->namespace = isset($node->name) ? $node->name->parts : [];
+        } elseif ($node instanceof Class_) {
+            $constructor = null;
+            foreach ($node->stmts as $stmt) {
+                if ($stmt instanceof ClassMethod) {
+                    // If we find a new-style constructor, no need to look for the old-style
+                    if ('__construct' === \strtolower($stmt->name)) {
+                        $this->validateConstructor($stmt, $node);
+
+                        return;
+                    }
+
+                    // We found a possible old-style constructor (unless there is also a __construct method)
+                    if (empty($this->namespace) && \strtolower($node->name) === \strtolower($stmt->name)) {
+                        $constructor = $stmt;
+                    }
+                }
+            }
+
+            if ($constructor) {
+                $this->validateConstructor($constructor, $node);
+            }
+        }
+    }
+
+    /**
+     * @throws FatalErrorException the constructor function is static
+     * @throws FatalErrorException the constructor function has a return type
+     *
+     * @param Node $constructor
+     * @param Node $classNode
+     */
+    private function validateConstructor(Node $constructor, Node $classNode)
+    {
+        if ($constructor->isStatic()) {
+            // For PHP Parser 4.x
+            $className = $classNode->name instanceof Identifier ? $classNode->name->toString() : $classNode->name;
+
+            $msg = \sprintf(
+                'Constructor %s::%s() cannot be static',
+                \implode('\\', \array_merge($this->namespace, (array) $className)),
+                $constructor->name
+            );
+            throw new FatalErrorException($msg, 0, E_ERROR, null, $classNode->getLine());
+        }
+
+        if (\method_exists($constructor, 'getReturnType') && $constructor->getReturnType()) {
+            // For PHP Parser 4.x
+            $className = $classNode->name instanceof Identifier ? $classNode->name->toString() : $classNode->name;
+
+            $msg = \sprintf(
+                'Constructor %s::%s() cannot declare a return type',
+                \implode('\\', \array_merge($this->namespace, (array) $className)),
+                $constructor->name
+            );
+            throw new FatalErrorException($msg, 0, E_ERROR, null, $classNode->getLine());
+        }
+    }
+}

vendor/psy/psysh/src/CodeCleaner/ValidFunctionNamePass.php

@@ -0,0 +1,97 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Expr\Variable;
+use PhpParser\Node\Stmt\Do_;
+use PhpParser\Node\Stmt\Function_;
+use PhpParser\Node\Stmt\If_;
+use PhpParser\Node\Stmt\Switch_;
+use PhpParser\Node\Stmt\While_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that function calls will succeed.
+ *
+ * This pass throws a FatalErrorException rather than letting PHP run
+ * headfirst into a real fatal error and die.
+ */
+class ValidFunctionNamePass extends NamespaceAwarePass
+{
+    private $conditionalScopes = 0;
+
+    /**
+     * Store newly defined function names on the way in, to allow recursion.
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        parent::enterNode($node);
+
+        if (self::isConditional($node)) {
+            $this->conditionalScopes++;
+        } elseif ($node instanceof Function_) {
+            $name = $this->getFullyQualifiedName($node->name);
+
+            // @todo add an "else" here which adds a runtime check for instances where we can't tell
+            // whether a function is being redefined by static analysis alone.
+            if ($this->conditionalScopes === 0) {
+                if (\function_exists($name) ||
+                    isset($this->currentScope[\strtolower($name)])) {
+                    $msg = \sprintf('Cannot redeclare %s()', $name);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                }
+            }
+
+            $this->currentScope[\strtolower($name)] = true;
+        }
+    }
+
+    /**
+     * Validate that function calls will succeed.
+     *
+     * @throws FatalErrorException if a function is redefined
+     * @throws FatalErrorException if the function name is a string (not an expression) and is not defined
+     *
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if (self::isConditional($node)) {
+            $this->conditionalScopes--;
+        } elseif ($node instanceof FuncCall) {
+            // if function name is an expression or a variable, give it a pass for now.
+            $name = $node->name;
+            if (!$name instanceof Expr && !$name instanceof Variable) {
+                $shortName = \implode('\\', $name->parts);
+                $fullName  = $this->getFullyQualifiedName($name);
+                $inScope   = isset($this->currentScope[\strtolower($fullName)]);
+                if (!$inScope && !\function_exists($shortName) && !\function_exists($fullName)) {
+                    $message = \sprintf('Call to undefined function %s()', $name);
+                    throw new FatalErrorException($message, 0, E_ERROR, null, $node->getLine());
+                }
+            }
+        }
+    }
+
+    private static function isConditional(Node $node)
+    {
+        return $node instanceof If_ ||
+            $node instanceof While_ ||
+            $node instanceof Do_ ||
+            $node instanceof Switch_;
+    }
+}

vendor/psy/psysh/src/Command/BufferCommand.php

@@ -0,0 +1,77 @@
+<?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\Command;
+
+use Psy\Output\ShellOutput;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Interact with the current code buffer.
+ *
+ * Shows and clears the buffer for the current multi-line expression.
+ */
+class BufferCommand extends Command
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('buffer')
+            ->setAliases(['buf'])
+            ->setDefinition([
+                new InputOption('clear', '', InputOption::VALUE_NONE, 'Clear the current buffer.'),
+            ])
+            ->setDescription('Show (or clear) the contents of the code input buffer.')
+            ->setHelp(
+                <<<'HELP'
+Show the contents of the code buffer for the current multi-line expression.
+
+Optionally, clear the buffer by passing the <info>--clear</info> option.
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $buf = $this->getApplication()->getCodeBuffer();
+        if ($input->getOption('clear')) {
+            $this->getApplication()->resetCodeBuffer();
+            $output->writeln($this->formatLines($buf, 'urgent'), ShellOutput::NUMBER_LINES);
+        } else {
+            $output->writeln($this->formatLines($buf), ShellOutput::NUMBER_LINES);
+        }
+    }
+
+    /**
+     * A helper method for wrapping buffer lines in `<urgent>` and `<return>` formatter strings.
+     *
+     * @param array  $lines
+     * @param string $type  (default: 'return')
+     *
+     * @return array Formatted strings
+     */
+    protected function formatLines(array $lines, $type = 'return')
+    {
+        $template = \sprintf('<%s>%%s</%s>', $type, $type);
+
+        return \array_map(function ($line) use ($template) {
+            return \sprintf($template, $line);
+        }, $lines);
+    }
+}

vendor/psy/psysh/src/Command/ClearCommand.php

@@ -0,0 +1,49 @@
+<?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\Command;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Clear the Psy Shell.
+ *
+ * Just what it says on the tin.
+ */
+class ClearCommand extends Command
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('clear')
+            ->setDefinition([])
+            ->setDescription('Clear the Psy Shell screen.')
+            ->setHelp(
+                <<<'HELP'
+Clear the Psy Shell screen.
+
+Pro Tip: If your PHP has readline support, you should be able to use ctrl+l too!
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $output->write(\sprintf('%c[2J%c[0;0f', 27, 27));
+    }
+}

vendor/psy/psysh/src/Command/Command.php

@@ -0,0 +1,282 @@
+<?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\Command;
+
+use Psy\Shell;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Command\Command as BaseCommand;
+use Symfony\Component\Console\Helper\Table;
+use Symfony\Component\Console\Helper\TableHelper;
+use Symfony\Component\Console\Helper\TableStyle;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * The Psy Shell base command.
+ */
+abstract class Command extends BaseCommand
+{
+    /**
+     * Sets the application instance for this command.
+     *
+     * @param Application $application An Application instance
+     *
+     * @api
+     */
+    public function setApplication(Application $application = null)
+    {
+        if ($application !== null && !$application instanceof Shell) {
+            throw new \InvalidArgumentException('PsySH Commands require an instance of Psy\Shell');
+        }
+
+        return parent::setApplication($application);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function asText()
+    {
+        $messages = [
+            '<comment>Usage:</comment>',
+            ' ' . $this->getSynopsis(),
+            '',
+        ];
+
+        if ($this->getAliases()) {
+            $messages[] = $this->aliasesAsText();
+        }
+
+        if ($this->getArguments()) {
+            $messages[] = $this->argumentsAsText();
+        }
+
+        if ($this->getOptions()) {
+            $messages[] = $this->optionsAsText();
+        }
+
+        if ($help = $this->getProcessedHelp()) {
+            $messages[] = '<comment>Help:</comment>';
+            $messages[] = ' ' . \str_replace("\n", "\n ", $help) . "\n";
+        }
+
+        return \implode("\n", $messages);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    private function getArguments()
+    {
+        $hidden = $this->getHiddenArguments();
+
+        return \array_filter($this->getNativeDefinition()->getArguments(), function ($argument) use ($hidden) {
+            return !\in_array($argument->getName(), $hidden);
+        });
+    }
+
+    /**
+     * These arguments will be excluded from help output.
+     *
+     * @return array
+     */
+    protected function getHiddenArguments()
+    {
+        return ['command'];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    private function getOptions()
+    {
+        $hidden = $this->getHiddenOptions();
+
+        return \array_filter($this->getNativeDefinition()->getOptions(), function ($option) use ($hidden) {
+            return !\in_array($option->getName(), $hidden);
+        });
+    }
+
+    /**
+     * These options will be excluded from help output.
+     *
+     * @return array
+     */
+    protected function getHiddenOptions()
+    {
+        return ['verbose'];
+    }
+
+    /**
+     * Format command aliases as text..
+     *
+     * @return string
+     */
+    private function aliasesAsText()
+    {
+        return '<comment>Aliases:</comment> <info>' . \implode(', ', $this->getAliases()) . '</info>' . PHP_EOL;
+    }
+
+    /**
+     * Format command arguments as text.
+     *
+     * @return string
+     */
+    private function argumentsAsText()
+    {
+        $max = $this->getMaxWidth();
+        $messages = [];
+
+        $arguments = $this->getArguments();
+        if (!empty($arguments)) {
+            $messages[] = '<comment>Arguments:</comment>';
+            foreach ($arguments as $argument) {
+                if (null !== $argument->getDefault() && (!\is_array($argument->getDefault()) || \count($argument->getDefault()))) {
+                    $default = \sprintf('<comment> (default: %s)</comment>', $this->formatDefaultValue($argument->getDefault()));
+                } else {
+                    $default = '';
+                }
+
+                $description = \str_replace("\n", "\n" . \str_pad('', $max + 2, ' '), $argument->getDescription());
+
+                $messages[] = \sprintf(" <info>%-${max}s</info> %s%s", $argument->getName(), $description, $default);
+            }
+
+            $messages[] = '';
+        }
+
+        return \implode(PHP_EOL, $messages);
+    }
+
+    /**
+     * Format options as text.
+     *
+     * @return string
+     */
+    private function optionsAsText()
+    {
+        $max = $this->getMaxWidth();
+        $messages = [];
+
+        $options = $this->getOptions();
+        if ($options) {
+            $messages[] = '<comment>Options:</comment>';
+
+            foreach ($options as $option) {
+                if ($option->acceptValue() && null !== $option->getDefault() && (!\is_array($option->getDefault()) || \count($option->getDefault()))) {
+                    $default = \sprintf('<comment> (default: %s)</comment>', $this->formatDefaultValue($option->getDefault()));
+                } else {
+                    $default = '';
+                }
+
+                $multiple = $option->isArray() ? '<comment> (multiple values allowed)</comment>' : '';
+                $description = \str_replace("\n", "\n" . \str_pad('', $max + 2, ' '), $option->getDescription());
+
+                $optionMax = $max - \strlen($option->getName()) - 2;
+                $messages[] = \sprintf(
+                    " <info>%s</info> %-${optionMax}s%s%s%s",
+                    '--' . $option->getName(),
+                    $option->getShortcut() ? \sprintf('(-%s) ', $option->getShortcut()) : '',
+                    $description,
+                    $default,
+                    $multiple
+                );
+            }
+
+            $messages[] = '';
+        }
+
+        return \implode(PHP_EOL, $messages);
+    }
+
+    /**
+     * Calculate the maximum padding width for a set of lines.
+     *
+     * @return int
+     */
+    private function getMaxWidth()
+    {
+        $max = 0;
+
+        foreach ($this->getOptions() as $option) {
+            $nameLength = \strlen($option->getName()) + 2;
+            if ($option->getShortcut()) {
+                $nameLength += \strlen($option->getShortcut()) + 3;
+            }
+
+            $max = \max($max, $nameLength);
+        }
+
+        foreach ($this->getArguments() as $argument) {
+            $max = \max($max, \strlen($argument->getName()));
+        }
+
+        return ++$max;
+    }
+
+    /**
+     * Format an option default as text.
+     *
+     * @param mixed $default
+     *
+     * @return string
+     */
+    private function formatDefaultValue($default)
+    {
+        if (\is_array($default) && $default === \array_values($default)) {
+            return \sprintf("array('%s')", \implode("', '", $default));
+        }
+
+        return \str_replace("\n", '', \var_export($default, true));
+    }
+
+    /**
+     * Get a Table instance.
+     *
+     * Falls back to legacy TableHelper.
+     *
+     * @return Table|TableHelper
+     */
+    protected function getTable(OutputInterface $output)
+    {
+        if (!\class_exists('Symfony\Component\Console\Helper\Table')) {
+            return $this->getTableHelper();
+        }
+
+        $style = new TableStyle();
+        $style
+            ->setVerticalBorderChar(' ')
+            ->setHorizontalBorderChar('')
+            ->setCrossingChar('');
+
+        $table = new Table($output);
+
+        return $table
+            ->setRows([])
+            ->setStyle($style);
+    }
+
+    /**
+     * Legacy fallback for getTable.
+     *
+     * @return TableHelper
+     */
+    protected function getTableHelper()
+    {
+        $table = $this->getApplication()->getHelperSet()->get('table');
+
+        return $table
+            ->setRows([])
+            ->setLayout(TableHelper::LAYOUT_BORDERLESS)
+            ->setHorizontalBorderChar('')
+            ->setCrossingChar('');
+    }
+}

vendor/psy/psysh/src/Command/DocCommand.php

@@ -0,0 +1,131 @@
+<?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\Command;
+
+use Psy\Formatter\DocblockFormatter;
+use Psy\Formatter\SignatureFormatter;
+use Psy\Input\CodeArgument;
+use Psy\Reflection\ReflectionLanguageConstruct;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Read the documentation for an object, class, constant, method or property.
+ */
+class DocCommand extends ReflectingCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('doc')
+            ->setAliases(['rtfm', 'man'])
+            ->setDefinition([
+                new CodeArgument('target', CodeArgument::REQUIRED, 'Function, class, instance, constant, method or property to document.'),
+            ])
+            ->setDescription('Read the documentation for an object, class, constant, method or property.')
+            ->setHelp(
+                <<<HELP
+Read the documentation for an object, class, constant, method or property.
+
+It's awesome for well-documented code, not quite as awesome for poorly documented code.
+
+e.g.
+<return>>>> doc preg_replace</return>
+<return>>>> doc Psy\Shell</return>
+<return>>>> doc Psy\Shell::debug</return>
+<return>>>> \$s = new Psy\Shell</return>
+<return>>>> doc \$s->run</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $value = $input->getArgument('target');
+        if (ReflectionLanguageConstruct::isLanguageConstruct($value)) {
+            $reflector = new ReflectionLanguageConstruct($value);
+            $doc = $this->getManualDocById($value);
+        } else {
+            list($target, $reflector) = $this->getTargetAndReflector($value);
+            $doc = $this->getManualDoc($reflector) ?: DocblockFormatter::format($reflector);
+        }
+
+        $db = $this->getApplication()->getManualDb();
+
+        $output->page(function ($output) use ($reflector, $doc, $db) {
+            $output->writeln(SignatureFormatter::format($reflector));
+            $output->writeln('');
+
+            if (empty($doc) && !$db) {
+                $output->writeln('<warning>PHP manual not found</warning>');
+                $output->writeln('    To document core PHP functionality, download the PHP reference manual:');
+                $output->writeln('    https://github.com/bobthecow/psysh/wiki/PHP-manual');
+            } else {
+                $output->writeln($doc);
+            }
+        });
+
+        // Set some magic local variables
+        $this->setCommandScopeVariables($reflector);
+    }
+
+    private function getManualDoc($reflector)
+    {
+        switch (\get_class($reflector)) {
+            case 'ReflectionClass':
+            case 'ReflectionObject':
+            case 'ReflectionFunction':
+                $id = $reflector->name;
+                break;
+
+            case 'ReflectionMethod':
+                $id = $reflector->class . '::' . $reflector->name;
+                break;
+
+            case 'ReflectionProperty':
+                $id = $reflector->class . '::$' . $reflector->name;
+                break;
+
+            case 'ReflectionClassConstant':
+            case 'Psy\Reflection\ReflectionClassConstant':
+                // @todo this is going to collide with ReflectionMethod ids
+                // someday... start running the query by id + type if the DB
+                // supports it.
+                $id = $reflector->class . '::' . $reflector->name;
+                break;
+
+            case 'Psy\Reflection\ReflectionConstant_':
+                $id = $reflector->name;
+                break;
+
+            default:
+                return false;
+        }
+
+        return $this->getManualDocById($id);
+    }
+
+    private function getManualDocById($id)
+    {
+        if ($db = $this->getApplication()->getManualDb()) {
+            return $db
+                ->query(\sprintf('SELECT doc FROM php_manual WHERE id = %s', $db->quote($id)))
+                ->fetchColumn(0);
+        }
+    }
+}

vendor/psy/psysh/src/Command/DumpCommand.php

@@ -0,0 +1,94 @@
+<?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\Command;
+
+use Psy\Input\CodeArgument;
+use Psy\VarDumper\Presenter;
+use Psy\VarDumper\PresenterAware;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Dump an object or primitive.
+ *
+ * This is like var_dump but *way* awesomer.
+ */
+class DumpCommand extends ReflectingCommand implements PresenterAware
+{
+    private $presenter;
+
+    /**
+     * PresenterAware interface.
+     *
+     * @param Presenter $presenter
+     */
+    public function setPresenter(Presenter $presenter)
+    {
+        $this->presenter = $presenter;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('dump')
+            ->setDefinition([
+                new CodeArgument('target', CodeArgument::REQUIRED, 'A target object or primitive to dump.'),
+                new InputOption('depth', '', InputOption::VALUE_REQUIRED, 'Depth to parse.', 10),
+                new InputOption('all', 'a', InputOption::VALUE_NONE, 'Include private and protected methods and properties.'),
+            ])
+            ->setDescription('Dump an object or primitive.')
+            ->setHelp(
+                <<<'HELP'
+Dump an object or primitive.
+
+This is like var_dump but <strong>way</strong> awesomer.
+
+e.g.
+<return>>>> dump $_</return>
+<return>>>> dump $someVar</return>
+<return>>>> dump $stuff->getAll()</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $depth  = $input->getOption('depth');
+        $target = $this->resolveCode($input->getArgument('target'));
+        $output->page($this->presenter->present($target, $depth, $input->getOption('all') ? Presenter::VERBOSE : 0));
+
+        if (\is_object($target)) {
+            $this->setCommandScopeVariables(new \ReflectionObject($target));
+        }
+    }
+
+    /**
+     * @deprecated Use `resolveCode` instead
+     *
+     * @param string $name
+     *
+     * @return mixed
+     */
+    protected function resolveTarget($name)
+    {
+        @\trigger_error('`resolveTarget` is deprecated; use `resolveCode` instead.', E_USER_DEPRECATED);
+
+        return $this->resolveCode($name);
+    }
+}

vendor/psy/psysh/src/Command/EditCommand.php

@@ -0,0 +1,187 @@
+<?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\Command;
+
+use Psy\Context;
+use Psy\ContextAware;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class EditCommand extends Command implements ContextAware
+{
+    /**
+     * @var string
+     */
+    private $runtimeDir = '';
+
+    /**
+     * @var Context
+     */
+    private $context;
+
+    /**
+     * Constructor.
+     *
+     * @param string      $runtimeDir The directory to use for temporary files
+     * @param string|null $name       The name of the command; passing null means it must be set in configure()
+     *
+     * @throws \Symfony\Component\Console\Exception\LogicException When the command name is empty
+     */
+    public function __construct($runtimeDir, $name = null)
+    {
+        parent::__construct($name);
+
+        $this->runtimeDir = $runtimeDir;
+    }
+
+    protected function configure()
+    {
+        $this
+            ->setName('edit')
+            ->setDefinition([
+                new InputArgument('file', InputArgument::OPTIONAL, 'The file to open for editing. If this is not given, edits a temporary file.', null),
+                new InputOption(
+                    'exec',
+                    'e',
+                    InputOption::VALUE_NONE,
+                    'Execute the file content after editing. This is the default when a file name argument is not given.',
+                    null
+                ),
+                new InputOption(
+                    'no-exec',
+                    'E',
+                    InputOption::VALUE_NONE,
+                    'Do not execute the file content after editing. This is the default when a file name argument is given.',
+                    null
+                ),
+            ])
+            ->setDescription('Open an external editor. Afterwards, get produced code in input buffer.')
+            ->setHelp('Set the EDITOR environment variable to something you\'d like to use.');
+    }
+
+    /**
+     * @param InputInterface  $input
+     * @param OutputInterface $output
+     *
+     * @throws \InvalidArgumentException when both exec and no-exec flags are given or if a given variable is not found in the current context
+     * @throws \UnexpectedValueException if file_get_contents on the edited file returns false instead of a string
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        if ($input->getOption('exec') &&
+            $input->getOption('no-exec')) {
+            throw new \InvalidArgumentException('The --exec and --no-exec flags are mutually exclusive');
+        }
+
+        $filePath = $this->extractFilePath($input->getArgument('file'));
+
+        $execute = $this->shouldExecuteFile(
+            $input->getOption('exec'),
+            $input->getOption('no-exec'),
+            $filePath
+        );
+
+        $shouldRemoveFile = false;
+
+        if ($filePath === null) {
+            $filePath = \tempnam($this->runtimeDir, 'psysh-edit-command');
+            $shouldRemoveFile = true;
+        }
+
+        $editedContent = $this->editFile($filePath, $shouldRemoveFile);
+
+        if ($execute) {
+            $this->getApplication()->addInput($editedContent);
+        }
+    }
+
+    /**
+     * @param bool        $execOption
+     * @param bool        $noExecOption
+     * @param string|null $filePath
+     *
+     * @return bool
+     */
+    private function shouldExecuteFile($execOption, $noExecOption, $filePath)
+    {
+        if ($execOption) {
+            return true;
+        }
+
+        if ($noExecOption) {
+            return false;
+        }
+
+        // By default, code that is edited is executed if there was no given input file path
+        return $filePath === null;
+    }
+
+    /**
+     * @param string|null $fileArgument
+     *
+     * @return string|null The file path to edit, null if the input was null, or the value of the referenced variable
+     *
+     * @throws \InvalidArgumentException If the variable is not found in the current context
+     */
+    private function extractFilePath($fileArgument)
+    {
+        // If the file argument was a variable, get it from the context
+        if ($fileArgument !== null &&
+            \strlen($fileArgument) > 0 &&
+            $fileArgument[0] === '$') {
+            $fileArgument = $this->context->get(\preg_replace('/^\$/', '', $fileArgument));
+        }
+
+        return $fileArgument;
+    }
+
+    /**
+     * @param string $filePath
+     * @param string $shouldRemoveFile
+     *
+     * @return string
+     *
+     * @throws \UnexpectedValueException if file_get_contents on $filePath returns false instead of a string
+     */
+    private function editFile($filePath, $shouldRemoveFile)
+    {
+        $escapedFilePath = \escapeshellarg($filePath);
+
+        $pipes = [];
+        $proc = \proc_open((\getenv('EDITOR') ?: 'nano') . " {$escapedFilePath}", [STDIN, STDOUT, STDERR], $pipes);
+        \proc_close($proc);
+
+        $editedContent = @\file_get_contents($filePath);
+
+        if ($shouldRemoveFile) {
+            @\unlink($filePath);
+        }
+
+        if ($editedContent === false) {
+            throw new \UnexpectedValueException("Reading {$filePath} returned false");
+        }
+
+        return $editedContent;
+    }
+
+    /**
+     * Set the Context reference.
+     *
+     * @param Context $context
+     */
+    public function setContext(Context $context)
+    {
+        $this->context = $context;
+    }
+}

vendor/psy/psysh/src/Command/ExitCommand.php

@@ -0,0 +1,52 @@
+<?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\Command;
+
+use Psy\Exception\BreakException;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Exit the Psy Shell.
+ *
+ * Just what it says on the tin.
+ */
+class ExitCommand extends Command
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('exit')
+            ->setAliases(['quit', 'q'])
+            ->setDefinition([])
+            ->setDescription('End the current session and return to caller.')
+            ->setHelp(
+                <<<'HELP'
+End the current session and return to caller.
+
+e.g.
+<return>>>> exit</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        throw new BreakException('Goodbye');
+    }
+}

vendor/psy/psysh/src/Command/HelpCommand.php

@@ -0,0 +1,98 @@
+<?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\Command;
+
+use Symfony\Component\Console\Helper\TableHelper;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Help command.
+ *
+ * Lists available commands, and gives command-specific help when asked nicely.
+ */
+class HelpCommand extends Command
+{
+    private $command;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('help')
+            ->setAliases(['?'])
+            ->setDefinition([
+                new InputArgument('command_name', InputArgument::OPTIONAL, 'The command name.', null),
+            ])
+            ->setDescription('Show a list of commands. Type `help [foo]` for information about [foo].')
+            ->setHelp('My. How meta.');
+    }
+
+    /**
+     * Helper for setting a subcommand to retrieve help for.
+     *
+     * @param Command $command
+     */
+    public function setCommand($command)
+    {
+        $this->command = $command;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        if ($this->command !== null) {
+            // help for an individual command
+            $output->page($this->command->asText());
+            $this->command = null;
+        } elseif ($name = $input->getArgument('command_name')) {
+            // help for an individual command
+            $output->page($this->getApplication()->get($name)->asText());
+        } else {
+            // list available commands
+            $commands = $this->getApplication()->all();
+
+            $table = $this->getTable($output);
+
+            foreach ($commands as $name => $command) {
+                if ($name !== $command->getName()) {
+                    continue;
+                }
+
+                if ($command->getAliases()) {
+                    $aliases = \sprintf('<comment>Aliases:</comment> %s', \implode(', ', $command->getAliases()));
+                } else {
+                    $aliases = '';
+                }
+
+                $table->addRow([
+                    \sprintf('<info>%s</info>', $name),
+                    $command->getDescription(),
+                    $aliases,
+                ]);
+            }
+
+            $output->startPaging();
+            if ($table instanceof TableHelper) {
+                $table->render($output);
+            } else {
+                $table->render();
+            }
+            $output->stopPaging();
+        }
+    }
+}

vendor/psy/psysh/src/Command/HistoryCommand.php

@@ -0,0 +1,246 @@
+<?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\Command;
+
+use Psy\Input\FilterOptions;
+use Psy\Output\ShellOutput;
+use Psy\Readline\Readline;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Psy Shell history command.
+ *
+ * Shows, searches and replays readline history. Not too shabby.
+ */
+class HistoryCommand extends Command
+{
+    private $filter;
+    private $readline;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($name = null)
+    {
+        $this->filter = new FilterOptions();
+
+        parent::__construct($name);
+    }
+
+    /**
+     * Set the Shell's Readline service.
+     *
+     * @param Readline $readline
+     */
+    public function setReadline(Readline $readline)
+    {
+        $this->readline = $readline;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        list($grep, $insensitive, $invert) = FilterOptions::getOptions();
+
+        $this
+            ->setName('history')
+            ->setAliases(['hist'])
+            ->setDefinition([
+                new InputOption('show',        's', InputOption::VALUE_REQUIRED, 'Show the given range of lines.'),
+                new InputOption('head',        'H', InputOption::VALUE_REQUIRED, 'Display the first N items.'),
+                new InputOption('tail',        'T', InputOption::VALUE_REQUIRED, 'Display the last N items.'),
+
+                $grep,
+                $insensitive,
+                $invert,
+
+                new InputOption('no-numbers',  'N', InputOption::VALUE_NONE,     'Omit line numbers.'),
+
+                new InputOption('save',        '',  InputOption::VALUE_REQUIRED, 'Save history to a file.'),
+                new InputOption('replay',      '',  InputOption::VALUE_NONE,     'Replay.'),
+                new InputOption('clear',       '',  InputOption::VALUE_NONE,     'Clear the history.'),
+            ])
+            ->setDescription('Show the Psy Shell history.')
+            ->setHelp(
+                <<<'HELP'
+Show, search, save or replay the Psy Shell history.
+
+e.g.
+<return>>>> history --grep /[bB]acon/</return>
+<return>>>> history --show 0..10 --replay</return>
+<return>>>> history --clear</return>
+<return>>>> history --tail 1000 --save somefile.txt</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->validateOnlyOne($input, ['show', 'head', 'tail']);
+        $this->validateOnlyOne($input, ['save', 'replay', 'clear']);
+
+        $history = $this->getHistorySlice(
+            $input->getOption('show'),
+            $input->getOption('head'),
+            $input->getOption('tail')
+        );
+        $highlighted = false;
+
+        $this->filter->bind($input);
+        if ($this->filter->hasFilter()) {
+            $matches     = [];
+            $highlighted = [];
+            foreach ($history as $i => $line) {
+                if ($this->filter->match($line, $matches)) {
+                    if (isset($matches[0])) {
+                        $chunks = \explode($matches[0], $history[$i]);
+                        $chunks = \array_map([__CLASS__, 'escape'], $chunks);
+                        $glue   = \sprintf('<urgent>%s</urgent>', self::escape($matches[0]));
+
+                        $highlighted[$i] = \implode($glue, $chunks);
+                    }
+                } else {
+                    unset($history[$i]);
+                }
+            }
+        }
+
+        if ($save = $input->getOption('save')) {
+            $output->writeln(\sprintf('Saving history in %s...', $save));
+            \file_put_contents($save, \implode(PHP_EOL, $history) . PHP_EOL);
+            $output->writeln('<info>History saved.</info>');
+        } elseif ($input->getOption('replay')) {
+            if (!($input->getOption('show') || $input->getOption('head') || $input->getOption('tail'))) {
+                throw new \InvalidArgumentException('You must limit history via --head, --tail or --show before replaying');
+            }
+
+            $count = \count($history);
+            $output->writeln(\sprintf('Replaying %d line%s of history', $count, ($count !== 1) ? 's' : ''));
+            $this->getApplication()->addInput($history);
+        } elseif ($input->getOption('clear')) {
+            $this->clearHistory();
+            $output->writeln('<info>History cleared.</info>');
+        } else {
+            $type = $input->getOption('no-numbers') ? 0 : ShellOutput::NUMBER_LINES;
+            if (!$highlighted) {
+                $type = $type | ShellOutput::OUTPUT_RAW;
+            }
+
+            $output->page($highlighted ?: $history, $type);
+        }
+    }
+
+    /**
+     * Extract a range from a string.
+     *
+     * @param string $range
+     *
+     * @return array [ start, end ]
+     */
+    private function extractRange($range)
+    {
+        if (\preg_match('/^\d+$/', $range)) {
+            return [$range, $range + 1];
+        }
+
+        $matches = [];
+        if ($range !== '..' && \preg_match('/^(\d*)\.\.(\d*)$/', $range, $matches)) {
+            $start = $matches[1] ? \intval($matches[1]) : 0;
+            $end   = $matches[2] ? \intval($matches[2]) + 1 : PHP_INT_MAX;
+
+            return [$start, $end];
+        }
+
+        throw new \InvalidArgumentException('Unexpected range: ' . $range);
+    }
+
+    /**
+     * Retrieve a slice of the readline history.
+     *
+     * @param string $show
+     * @param string $head
+     * @param string $tail
+     *
+     * @return array A slilce of history
+     */
+    private function getHistorySlice($show, $head, $tail)
+    {
+        $history = $this->readline->listHistory();
+
+        // don't show the current `history` invocation
+        \array_pop($history);
+
+        if ($show) {
+            list($start, $end) = $this->extractRange($show);
+            $length = $end - $start;
+        } elseif ($head) {
+            if (!\preg_match('/^\d+$/', $head)) {
+                throw new \InvalidArgumentException('Please specify an integer argument for --head');
+            }
+
+            $start  = 0;
+            $length = \intval($head);
+        } elseif ($tail) {
+            if (!\preg_match('/^\d+$/', $tail)) {
+                throw new \InvalidArgumentException('Please specify an integer argument for --tail');
+            }
+
+            $start  = \count($history) - $tail;
+            $length = \intval($tail) + 1;
+        } else {
+            return $history;
+        }
+
+        return \array_slice($history, $start, $length, true);
+    }
+
+    /**
+     * Validate that only one of the given $options is set.
+     *
+     * @param InputInterface $input
+     * @param array          $options
+     */
+    private function validateOnlyOne(InputInterface $input, array $options)
+    {
+        $count = 0;
+        foreach ($options as $opt) {
+            if ($input->getOption($opt)) {
+                $count++;
+            }
+        }
+
+        if ($count > 1) {
+            throw new \InvalidArgumentException('Please specify only one of --' . \implode(', --', $options));
+        }
+    }
+
+    /**
+     * Clear the readline history.
+     */
+    private function clearHistory()
+    {
+        $this->readline->clearHistory();
+    }
+
+    public static function escape($string)
+    {
+        return OutputFormatter::escape($string);
+    }
+}

vendor/psy/psysh/src/Command/ListCommand.php

@@ -0,0 +1,276 @@
+<?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\Command;
+
+use Psy\Command\ListCommand\ClassConstantEnumerator;
+use Psy\Command\ListCommand\ClassEnumerator;
+use Psy\Command\ListCommand\ConstantEnumerator;
+use Psy\Command\ListCommand\FunctionEnumerator;
+use Psy\Command\ListCommand\GlobalVariableEnumerator;
+use Psy\Command\ListCommand\MethodEnumerator;
+use Psy\Command\ListCommand\PropertyEnumerator;
+use Psy\Command\ListCommand\VariableEnumerator;
+use Psy\Exception\RuntimeException;
+use Psy\Input\CodeArgument;
+use Psy\Input\FilterOptions;
+use Psy\VarDumper\Presenter;
+use Psy\VarDumper\PresenterAware;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Helper\TableHelper;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * List available local variables, object properties, etc.
+ */
+class ListCommand extends ReflectingCommand implements PresenterAware
+{
+    protected $presenter;
+    protected $enumerators;
+
+    /**
+     * PresenterAware interface.
+     *
+     * @param Presenter $presenter
+     */
+    public function setPresenter(Presenter $presenter)
+    {
+        $this->presenter = $presenter;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        list($grep, $insensitive, $invert) = FilterOptions::getOptions();
+
+        $this
+            ->setName('ls')
+            ->setAliases(['list', 'dir'])
+            ->setDefinition([
+                new CodeArgument('target', CodeArgument::OPTIONAL, 'A target class or object to list.'),
+
+                new InputOption('vars',        '',  InputOption::VALUE_NONE,     'Display variables.'),
+                new InputOption('constants',   'c', InputOption::VALUE_NONE,     'Display defined constants.'),
+                new InputOption('functions',   'f', InputOption::VALUE_NONE,     'Display defined functions.'),
+                new InputOption('classes',     'k', InputOption::VALUE_NONE,     'Display declared classes.'),
+                new InputOption('interfaces',  'I', InputOption::VALUE_NONE,     'Display declared interfaces.'),
+                new InputOption('traits',      't', InputOption::VALUE_NONE,     'Display declared traits.'),
+
+                new InputOption('no-inherit',  '',  InputOption::VALUE_NONE,     'Exclude inherited methods, properties and constants.'),
+
+                new InputOption('properties',  'p', InputOption::VALUE_NONE,     'Display class or object properties (public properties by default).'),
+                new InputOption('methods',     'm', InputOption::VALUE_NONE,     'Display class or object methods (public methods by default).'),
+
+                $grep,
+                $insensitive,
+                $invert,
+
+                new InputOption('globals',     'g', InputOption::VALUE_NONE,     'Include global variables.'),
+                new InputOption('internal',    'n', InputOption::VALUE_NONE,     'Limit to internal functions and classes.'),
+                new InputOption('user',        'u', InputOption::VALUE_NONE,     'Limit to user-defined constants, functions and classes.'),
+                new InputOption('category',    'C', InputOption::VALUE_REQUIRED, 'Limit to constants in a specific category (e.g. "date").'),
+
+                new InputOption('all',         'a', InputOption::VALUE_NONE,     'Include private and protected methods and properties.'),
+                new InputOption('long',        'l', InputOption::VALUE_NONE,     'List in long format: includes class names and method signatures.'),
+            ])
+            ->setDescription('List local, instance or class variables, methods and constants.')
+            ->setHelp(
+                <<<'HELP'
+List variables, constants, classes, interfaces, traits, functions, methods,
+and properties.
+
+Called without options, this will return a list of variables currently in scope.
+
+If a target object is provided, list properties, constants and methods of that
+target. If a class, interface or trait name is passed instead, list constants
+and methods on that class.
+
+e.g.
+<return>>>> ls</return>
+<return>>>> ls $foo</return>
+<return>>>> ls -k --grep mongo -i</return>
+<return>>>> ls -al ReflectionClass</return>
+<return>>>> ls --constants --category date</return>
+<return>>>> ls -l --functions --grep /^array_.*/</return>
+<return>>>> ls -l --properties new DateTime()</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->validateInput($input);
+        $this->initEnumerators();
+
+        $method = $input->getOption('long') ? 'writeLong' : 'write';
+
+        if ($target = $input->getArgument('target')) {
+            list($target, $reflector) = $this->getTargetAndReflector($target);
+        } else {
+            $reflector = null;
+        }
+
+        // @todo something cleaner than this :-/
+        if ($input->getOption('long')) {
+            $output->startPaging();
+        }
+
+        foreach ($this->enumerators as $enumerator) {
+            $this->$method($output, $enumerator->enumerate($input, $reflector, $target));
+        }
+
+        if ($input->getOption('long')) {
+            $output->stopPaging();
+        }
+
+        // Set some magic local variables
+        if ($reflector !== null) {
+            $this->setCommandScopeVariables($reflector);
+        }
+    }
+
+    /**
+     * Initialize Enumerators.
+     */
+    protected function initEnumerators()
+    {
+        if (!isset($this->enumerators)) {
+            $mgr = $this->presenter;
+
+            $this->enumerators = [
+                new ClassConstantEnumerator($mgr),
+                new ClassEnumerator($mgr),
+                new ConstantEnumerator($mgr),
+                new FunctionEnumerator($mgr),
+                new GlobalVariableEnumerator($mgr),
+                new PropertyEnumerator($mgr),
+                new MethodEnumerator($mgr),
+                new VariableEnumerator($mgr, $this->context),
+            ];
+        }
+    }
+
+    /**
+     * Write the list items to $output.
+     *
+     * @param OutputInterface $output
+     * @param null|array      $result List of enumerated items
+     */
+    protected function write(OutputInterface $output, array $result = null)
+    {
+        if ($result === null) {
+            return;
+        }
+
+        foreach ($result as $label => $items) {
+            $names = \array_map([$this, 'formatItemName'], $items);
+            $output->writeln(\sprintf('<strong>%s</strong>: %s', $label, \implode(', ', $names)));
+        }
+    }
+
+    /**
+     * Write the list items to $output.
+     *
+     * Items are listed one per line, and include the item signature.
+     *
+     * @param OutputInterface $output
+     * @param null|array      $result List of enumerated items
+     */
+    protected function writeLong(OutputInterface $output, array $result = null)
+    {
+        if ($result === null) {
+            return;
+        }
+
+        $table = $this->getTable($output);
+
+        foreach ($result as $label => $items) {
+            $output->writeln('');
+            $output->writeln(\sprintf('<strong>%s:</strong>', $label));
+
+            $table->setRows([]);
+            foreach ($items as $item) {
+                $table->addRow([$this->formatItemName($item), $item['value']]);
+            }
+
+            if ($table instanceof TableHelper) {
+                $table->render($output);
+            } else {
+                $table->render();
+            }
+        }
+    }
+
+    /**
+     * Format an item name given its visibility.
+     *
+     * @param array $item
+     *
+     * @return string
+     */
+    private function formatItemName($item)
+    {
+        return \sprintf('<%s>%s</%s>', $item['style'], OutputFormatter::escape($item['name']), $item['style']);
+    }
+
+    /**
+     * Validate that input options make sense, provide defaults when called without options.
+     *
+     * @throws RuntimeException if options are inconsistent
+     *
+     * @param InputInterface $input
+     */
+    private function validateInput(InputInterface $input)
+    {
+        if (!$input->getArgument('target')) {
+            // if no target is passed, there can be no properties or methods
+            foreach (['properties', 'methods', 'no-inherit'] as $option) {
+                if ($input->getOption($option)) {
+                    throw new RuntimeException('--' . $option . ' does not make sense without a specified target');
+                }
+            }
+
+            foreach (['globals', 'vars', 'constants', 'functions', 'classes', 'interfaces', 'traits'] as $option) {
+                if ($input->getOption($option)) {
+                    return;
+                }
+            }
+
+            // default to --vars if no other options are passed
+            $input->setOption('vars', true);
+        } else {
+            // if a target is passed, classes, functions, etc don't make sense
+            foreach (['vars', 'globals', 'functions', 'classes', 'interfaces', 'traits'] as $option) {
+                if ($input->getOption($option)) {
+                    throw new RuntimeException('--' . $option . ' does not make sense with a specified target');
+                }
+            }
+
+            foreach (['constants', 'properties', 'methods'] as $option) {
+                if ($input->getOption($option)) {
+                    return;
+                }
+            }
+
+            // default to --constants --properties --methods if no other options are passed
+            $input->setOption('constants',  true);
+            $input->setOption('properties', true);
+            $input->setOption('methods',    true);
+        }
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/ClassConstantEnumerator.php

@@ -0,0 +1,127 @@
+<?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\Command\ListCommand;
+
+use Psy\Reflection\ReflectionClassConstant;
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Class Constant Enumerator class.
+ */
+class ClassConstantEnumerator extends Enumerator
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list constants when a Reflector is present.
+
+        if ($reflector === null) {
+            return;
+        }
+
+        // We can only list constants on actual class (or object) reflectors.
+        if (!$reflector instanceof \ReflectionClass) {
+            // @todo handle ReflectionExtension as well
+            return;
+        }
+
+        // only list constants if we are specifically asked
+        if (!$input->getOption('constants')) {
+            return;
+        }
+
+        $noInherit = $input->getOption('no-inherit');
+        $constants = $this->prepareConstants($this->getConstants($reflector, $noInherit));
+
+        if (empty($constants)) {
+            return;
+        }
+
+        $ret = [];
+        $ret[$this->getKindLabel($reflector)] = $constants;
+
+        return $ret;
+    }
+
+    /**
+     * Get defined constants for the given class or object Reflector.
+     *
+     * @param \Reflector $reflector
+     * @param bool       $noInherit Exclude inherited constants
+     *
+     * @return array
+     */
+    protected function getConstants(\Reflector $reflector, $noInherit = false)
+    {
+        $className = $reflector->getName();
+
+        $constants = [];
+        foreach ($reflector->getConstants() as $name => $constant) {
+            $constReflector = ReflectionClassConstant::create($reflector->name, $name);
+
+            if ($noInherit && $constReflector->getDeclaringClass()->getName() !== $className) {
+                continue;
+            }
+
+            $constants[$name] = $constReflector;
+        }
+
+        \ksort($constants, SORT_NATURAL | SORT_FLAG_CASE);
+
+        return $constants;
+    }
+
+    /**
+     * Prepare formatted constant array.
+     *
+     * @param array $constants
+     *
+     * @return array
+     */
+    protected function prepareConstants(array $constants)
+    {
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($constants as $name => $constant) {
+            if ($this->showItem($name)) {
+                $ret[$name] = [
+                    'name'  => $name,
+                    'style' => self::IS_CONSTANT,
+                    'value' => $this->presentRef($constant->getValue()),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Get a label for the particular kind of "class" represented.
+     *
+     * @param \ReflectionClass $reflector
+     *
+     * @return string
+     */
+    protected function getKindLabel(\ReflectionClass $reflector)
+    {
+        if ($reflector->isInterface()) {
+            return 'Interface Constants';
+        } elseif (\method_exists($reflector, 'isTrait') && $reflector->isTrait()) {
+            return 'Trait Constants';
+        } else {
+            return 'Class Constants';
+        }
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/ClassEnumerator.php

@@ -0,0 +1,126 @@
+<?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\Command\ListCommand;
+
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Class Enumerator class.
+ */
+class ClassEnumerator extends Enumerator
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list classes when no Reflector is present.
+        //
+        // @todo make a NamespaceReflector and pass that in for commands like:
+        //
+        //     ls --classes Foo
+        //
+        // ... for listing classes in the Foo namespace
+
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        $user     = $input->getOption('user');
+        $internal = $input->getOption('internal');
+
+        $ret = [];
+
+        // only list classes, interfaces and traits if we are specifically asked
+
+        if ($input->getOption('classes')) {
+            $ret = \array_merge($ret, $this->filterClasses('Classes', \get_declared_classes(), $internal, $user));
+        }
+
+        if ($input->getOption('interfaces')) {
+            $ret = \array_merge($ret, $this->filterClasses('Interfaces', \get_declared_interfaces(), $internal, $user));
+        }
+
+        if ($input->getOption('traits')) {
+            $ret = \array_merge($ret, $this->filterClasses('Traits', \get_declared_traits(), $internal, $user));
+        }
+
+        return \array_map([$this, 'prepareClasses'], \array_filter($ret));
+    }
+
+    /**
+     * Filter a list of classes, interfaces or traits.
+     *
+     * If $internal or $user is defined, results will be limited to internal or
+     * user-defined classes as appropriate.
+     *
+     * @param string $key
+     * @param array  $classes
+     * @param bool   $internal
+     * @param bool   $user
+     *
+     * @return array
+     */
+    protected function filterClasses($key, $classes, $internal, $user)
+    {
+        $ret = [];
+
+        if ($internal) {
+            $ret['Internal ' . $key] = \array_filter($classes, function ($class) {
+                $refl = new \ReflectionClass($class);
+
+                return $refl->isInternal();
+            });
+        }
+
+        if ($user) {
+            $ret['User ' . $key] = \array_filter($classes, function ($class) {
+                $refl = new \ReflectionClass($class);
+
+                return !$refl->isInternal();
+            });
+        }
+
+        if (!$user && !$internal) {
+            $ret[$key] = $classes;
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Prepare formatted class array.
+     *
+     * @param array $classes
+     *
+     * @return array
+     */
+    protected function prepareClasses(array $classes)
+    {
+        \natcasesort($classes);
+
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($classes as $name) {
+            if ($this->showItem($name)) {
+                $ret[$name] = [
+                    'name'  => $name,
+                    'style' => self::IS_CLASS,
+                    'value' => $this->presentSignature($name),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/ConstantEnumerator.php

@@ -0,0 +1,122 @@
+<?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\Command\ListCommand;
+
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Constant Enumerator class.
+ */
+class ConstantEnumerator extends Enumerator
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list constants when no Reflector is present.
+        //
+        // @todo make a NamespaceReflector and pass that in for commands like:
+        //
+        //     ls --constants Foo
+        //
+        // ... for listing constants in the Foo namespace
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        // only list constants if we are specifically asked
+        if (!$input->getOption('constants')) {
+            return;
+        }
+
+        $user     = $input->getOption('user');
+        $internal = $input->getOption('internal');
+        $category = $input->getOption('category');
+
+        $ret = [];
+
+        if ($user) {
+            $ret['User Constants'] = $this->getConstants('user');
+        }
+
+        if ($internal) {
+            $ret['Interal Constants'] = $this->getConstants('internal');
+        }
+
+        if ($category) {
+            $label = \ucfirst($category) . ' Constants';
+            $ret[$label] = $this->getConstants($category);
+        }
+
+        if (!$user && !$internal && !$category) {
+            $ret['Constants'] = $this->getConstants();
+        }
+
+        return \array_map([$this, 'prepareConstants'], \array_filter($ret));
+    }
+
+    /**
+     * Get defined constants.
+     *
+     * Optionally restrict constants to a given category, e.g. "date". If the
+     * category is "internal", include all non-user-defined constants.
+     *
+     * @param string $category
+     *
+     * @return array
+     */
+    protected function getConstants($category = null)
+    {
+        if (!$category) {
+            return \get_defined_constants();
+        }
+
+        $consts = \get_defined_constants(true);
+
+        if ($category === 'internal') {
+            unset($consts['user']);
+
+            return \call_user_func_array('array_merge', $consts);
+        }
+
+        return isset($consts[$category]) ? $consts[$category] : [];
+    }
+
+    /**
+     * Prepare formatted constant array.
+     *
+     * @param array $constants
+     *
+     * @return array
+     */
+    protected function prepareConstants(array $constants)
+    {
+        // My kingdom for a generator.
+        $ret = [];
+
+        $names = \array_keys($constants);
+        \natcasesort($names);
+
+        foreach ($names as $name) {
+            if ($this->showItem($name)) {
+                $ret[$name] = [
+                    'name'  => $name,
+                    'style' => self::IS_CONSTANT,
+                    'value' => $this->presentRef($constants[$name]),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/Enumerator.php

@@ -0,0 +1,106 @@
+<?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\Command\ListCommand;
+
+use Psy\Formatter\SignatureFormatter;
+use Psy\Input\FilterOptions;
+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 $filter;
+    private $presenter;
+
+    /**
+     * Enumerator constructor.
+     *
+     * @param Presenter $presenter
+     */
+    public function __construct(Presenter $presenter)
+    {
+        $this->filter = new FilterOptions();
+        $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)
+    {
+        $this->filter->bind($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, $target = null);
+
+    protected function showItem($name)
+    {
+        return $this->filter->match($name);
+    }
+
+    protected function presentRef($value)
+    {
+        return $this->presenter->presentRef($value);
+    }
+
+    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);
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/FunctionEnumerator.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\Command\ListCommand;
+
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Function Enumerator class.
+ */
+class FunctionEnumerator extends Enumerator
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list functions when no Reflector is present.
+        //
+        // @todo make a NamespaceReflector and pass that in for commands like:
+        //
+        //     ls --functions Foo
+        //
+        // ... for listing functions in the Foo namespace
+
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        // only list functions if we are specifically asked
+        if (!$input->getOption('functions')) {
+            return;
+        }
+
+        if ($input->getOption('user')) {
+            $label     = 'User Functions';
+            $functions = $this->getFunctions('user');
+        } elseif ($input->getOption('internal')) {
+            $label     = 'Internal Functions';
+            $functions = $this->getFunctions('internal');
+        } else {
+            $label     = 'Functions';
+            $functions = $this->getFunctions();
+        }
+
+        $functions = $this->prepareFunctions($functions);
+
+        if (empty($functions)) {
+            return;
+        }
+
+        $ret = [];
+        $ret[$label] = $functions;
+
+        return $ret;
+    }
+
+    /**
+     * Get defined functions.
+     *
+     * Optionally limit functions to "user" or "internal" functions.
+     *
+     * @param null|string $type "user" or "internal" (default: both)
+     *
+     * @return array
+     */
+    protected function getFunctions($type = null)
+    {
+        $funcs = \get_defined_functions();
+
+        if ($type) {
+            return $funcs[$type];
+        } else {
+            return \array_merge($funcs['internal'], $funcs['user']);
+        }
+    }
+
+    /**
+     * Prepare formatted function array.
+     *
+     * @param array $functions
+     *
+     * @return array
+     */
+    protected function prepareFunctions(array $functions)
+    {
+        \natcasesort($functions);
+
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($functions as $name) {
+            if ($this->showItem($name)) {
+                $ret[$name] = [
+                    'name'  => $name,
+                    'style' => self::IS_FUNCTION,
+                    'value' => $this->presentSignature($name),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/GlobalVariableEnumerator.php

@@ -0,0 +1,92 @@
+<?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\Command\ListCommand;
+
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Global Variable Enumerator class.
+ */
+class GlobalVariableEnumerator extends Enumerator
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list globals when no Reflector is present.
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        // only list globals if we are specifically asked
+        if (!$input->getOption('globals')) {
+            return;
+        }
+
+        $globals = $this->prepareGlobals($this->getGlobals());
+
+        if (empty($globals)) {
+            return;
+        }
+
+        return [
+            'Global Variables' => $globals,
+        ];
+    }
+
+    /**
+     * Get defined global variables.
+     *
+     * @return array
+     */
+    protected function getGlobals()
+    {
+        global $GLOBALS;
+
+        $names = \array_keys($GLOBALS);
+        \natcasesort($names);
+
+        $ret = [];
+        foreach ($names as $name) {
+            $ret[$name] = $GLOBALS[$name];
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Prepare formatted global variable array.
+     *
+     * @param array $globals
+     *
+     * @return array
+     */
+    protected function prepareGlobals($globals)
+    {
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($globals as $name => $value) {
+            if ($this->showItem($name)) {
+                $fname = '$' . $name;
+                $ret[$fname] = [
+                    'name'  => $fname,
+                    'style' => self::IS_GLOBAL,
+                    'value' => $this->presentRef($value),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/InterfaceEnumerator.php

@@ -0,0 +1,89 @@
+<?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\Command\ListCommand;
+
+use Psy\VarDumper\Presenter;
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Interface Enumerator class.
+ *
+ * @deprecated Nothing should use this anymore
+ */
+class InterfaceEnumerator extends Enumerator
+{
+    public function __construct(Presenter $presenter)
+    {
+        @\trigger_error('InterfaceEnumerator is no longer used', E_USER_DEPRECATED);
+        parent::__construct($presenter);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list interfaces when no Reflector is present.
+        //
+        // @todo make a NamespaceReflector and pass that in for commands like:
+        //
+        //     ls --interfaces Foo
+        //
+        // ... for listing interfaces in the Foo namespace
+
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        // only list interfaces if we are specifically asked
+        if (!$input->getOption('interfaces')) {
+            return;
+        }
+
+        $interfaces = $this->prepareInterfaces(\get_declared_interfaces());
+
+        if (empty($interfaces)) {
+            return;
+        }
+
+        return [
+            'Interfaces' => $interfaces,
+        ];
+    }
+
+    /**
+     * Prepare formatted interface array.
+     *
+     * @param array $interfaces
+     *
+     * @return array
+     */
+    protected function prepareInterfaces(array $interfaces)
+    {
+        \natcasesort($interfaces);
+
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($interfaces as $name) {
+            if ($this->showItem($name)) {
+                $ret[$name] = [
+                    'name'  => $name,
+                    'style' => self::IS_CLASS,
+                    'value' => $this->presentSignature($name),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/MethodEnumerator.php

@@ -0,0 +1,145 @@
+<?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\Command\ListCommand;
+
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Method Enumerator class.
+ */
+class MethodEnumerator extends Enumerator
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list methods when a Reflector is present.
+
+        if ($reflector === null) {
+            return;
+        }
+
+        // We can only list methods on actual class (or object) reflectors.
+        if (!$reflector instanceof \ReflectionClass) {
+            return;
+        }
+
+        // only list methods if we are specifically asked
+        if (!$input->getOption('methods')) {
+            return;
+        }
+
+        $showAll   = $input->getOption('all');
+        $noInherit = $input->getOption('no-inherit');
+        $methods   = $this->prepareMethods($this->getMethods($showAll, $reflector, $noInherit));
+
+        if (empty($methods)) {
+            return;
+        }
+
+        $ret = [];
+        $ret[$this->getKindLabel($reflector)] = $methods;
+
+        return $ret;
+    }
+
+    /**
+     * Get defined methods for the given class or object Reflector.
+     *
+     * @param bool       $showAll   Include private and protected methods
+     * @param \Reflector $reflector
+     * @param bool       $noInherit Exclude inherited methods
+     *
+     * @return array
+     */
+    protected function getMethods($showAll, \Reflector $reflector, $noInherit = false)
+    {
+        $className = $reflector->getName();
+
+        $methods = [];
+        foreach ($reflector->getMethods() as $name => $method) {
+            if ($noInherit && $method->getDeclaringClass()->getName() !== $className) {
+                continue;
+            }
+
+            if ($showAll || $method->isPublic()) {
+                $methods[$method->getName()] = $method;
+            }
+        }
+
+        \ksort($methods, SORT_NATURAL | SORT_FLAG_CASE);
+
+        return $methods;
+    }
+
+    /**
+     * Prepare formatted method array.
+     *
+     * @param array $methods
+     *
+     * @return array
+     */
+    protected function prepareMethods(array $methods)
+    {
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($methods as $name => $method) {
+            if ($this->showItem($name)) {
+                $ret[$name] = [
+                    'name'  => $name,
+                    'style' => $this->getVisibilityStyle($method),
+                    'value' => $this->presentSignature($method),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Get a label for the particular kind of "class" represented.
+     *
+     * @param \ReflectionClass $reflector
+     *
+     * @return string
+     */
+    protected function getKindLabel(\ReflectionClass $reflector)
+    {
+        if ($reflector->isInterface()) {
+            return 'Interface Methods';
+        } elseif (\method_exists($reflector, 'isTrait') && $reflector->isTrait()) {
+            return 'Trait Methods';
+        } else {
+            return 'Class Methods';
+        }
+    }
+
+    /**
+     * Get output style for the given method's visibility.
+     *
+     * @param \ReflectionMethod $method
+     *
+     * @return string
+     */
+    private function getVisibilityStyle(\ReflectionMethod $method)
+    {
+        if ($method->isPublic()) {
+            return self::IS_PUBLIC;
+        } elseif ($method->isProtected()) {
+            return self::IS_PROTECTED;
+        } else {
+            return self::IS_PRIVATE;
+        }
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/PropertyEnumerator.php

@@ -0,0 +1,180 @@
+<?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\Command\ListCommand;
+
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Property Enumerator class.
+ */
+class PropertyEnumerator extends Enumerator
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list properties when a Reflector is present.
+
+        if ($reflector === null) {
+            return;
+        }
+
+        // We can only list properties on actual class (or object) reflectors.
+        if (!$reflector instanceof \ReflectionClass) {
+            return;
+        }
+
+        // only list properties if we are specifically asked
+        if (!$input->getOption('properties')) {
+            return;
+        }
+
+        $showAll    = $input->getOption('all');
+        $noInherit  = $input->getOption('no-inherit');
+        $properties = $this->prepareProperties($this->getProperties($showAll, $reflector, $noInherit), $target);
+
+        if (empty($properties)) {
+            return;
+        }
+
+        $ret = [];
+        $ret[$this->getKindLabel($reflector)] = $properties;
+
+        return $ret;
+    }
+
+    /**
+     * Get defined properties for the given class or object Reflector.
+     *
+     * @param bool       $showAll   Include private and protected properties
+     * @param \Reflector $reflector
+     * @param bool       $noInherit Exclude inherited properties
+     *
+     * @return array
+     */
+    protected function getProperties($showAll, \Reflector $reflector, $noInherit = false)
+    {
+        $className = $reflector->getName();
+
+        $properties = [];
+        foreach ($reflector->getProperties() as $property) {
+            if ($noInherit && $property->getDeclaringClass()->getName() !== $className) {
+                continue;
+            }
+
+            if ($showAll || $property->isPublic()) {
+                $properties[$property->getName()] = $property;
+            }
+        }
+
+        \ksort($properties, SORT_NATURAL | SORT_FLAG_CASE);
+
+        return $properties;
+    }
+
+    /**
+     * Prepare formatted property array.
+     *
+     * @param array $properties
+     *
+     * @return array
+     */
+    protected function prepareProperties(array $properties, $target = null)
+    {
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($properties as $name => $property) {
+            if ($this->showItem($name)) {
+                $fname = '$' . $name;
+                $ret[$fname] = [
+                    'name'  => $fname,
+                    'style' => $this->getVisibilityStyle($property),
+                    'value' => $this->presentValue($property, $target),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Get a label for the particular kind of "class" represented.
+     *
+     * @param \ReflectionClass $reflector
+     *
+     * @return string
+     */
+    protected function getKindLabel(\ReflectionClass $reflector)
+    {
+        if ($reflector->isInterface()) {
+            return 'Interface Properties';
+        } elseif (\method_exists($reflector, 'isTrait') && $reflector->isTrait()) {
+            return 'Trait Properties';
+        } else {
+            return 'Class Properties';
+        }
+    }
+
+    /**
+     * Get output style for the given property's visibility.
+     *
+     * @param \ReflectionProperty $property
+     *
+     * @return string
+     */
+    private function getVisibilityStyle(\ReflectionProperty $property)
+    {
+        if ($property->isPublic()) {
+            return self::IS_PUBLIC;
+        } elseif ($property->isProtected()) {
+            return self::IS_PROTECTED;
+        } else {
+            return self::IS_PRIVATE;
+        }
+    }
+
+    /**
+     * Present the $target's current value for a reflection property.
+     *
+     * @param \ReflectionProperty $property
+     * @param mixed               $target
+     *
+     * @return string
+     */
+    protected function presentValue(\ReflectionProperty $property, $target)
+    {
+        // If $target is a class, trait or interface (try to) get the default
+        // value for the property.
+        if (!\is_object($target)) {
+            try {
+                $refl = new \ReflectionClass($target);
+                $props = $refl->getDefaultProperties();
+                if (\array_key_exists($property->name, $props)) {
+                    $suffix = $property->isStatic() ? '' : ' <aside>(default)</aside>';
+
+                    return $this->presentRef($props[$property->name]) . $suffix;
+                }
+            } catch (\Exception $e) {
+                // Well, we gave it a shot.
+            }
+
+            return '';
+        }
+
+        $property->setAccessible(true);
+        $value = $property->getValue($target);
+
+        return $this->presentRef($value);
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/TraitEnumerator.php

@@ -0,0 +1,89 @@
+<?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\Command\ListCommand;
+
+use Psy\VarDumper\Presenter;
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Trait Enumerator class.
+ *
+ * @deprecated Nothing should use this anymore
+ */
+class TraitEnumerator extends Enumerator
+{
+    public function __construct(Presenter $presenter)
+    {
+        @\trigger_error('TraitEnumerator is no longer used', E_USER_DEPRECATED);
+        parent::__construct($presenter);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list traits when no Reflector is present.
+        //
+        // @todo make a NamespaceReflector and pass that in for commands like:
+        //
+        //     ls --traits Foo
+        //
+        // ... for listing traits in the Foo namespace
+
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        // only list traits if we are specifically asked
+        if (!$input->getOption('traits')) {
+            return;
+        }
+
+        $traits = $this->prepareTraits(\get_declared_traits());
+
+        if (empty($traits)) {
+            return;
+        }
+
+        return [
+            'Traits' => $traits,
+        ];
+    }
+
+    /**
+     * Prepare formatted trait array.
+     *
+     * @param array $traits
+     *
+     * @return array
+     */
+    protected function prepareTraits(array $traits)
+    {
+        \natcasesort($traits);
+
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($traits as $name) {
+            if ($this->showItem($name)) {
+                $ret[$name] = [
+                    'name'  => $name,
+                    'style' => self::IS_CLASS,
+                    'value' => $this->presentSignature($name),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}

vendor/psy/psysh/src/Command/ListCommand/VariableEnumerator.php

@@ -0,0 +1,137 @@
+<?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\Command\ListCommand;
+
+use Psy\Context;
+use Psy\VarDumper\Presenter;
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Variable Enumerator class.
+ */
+class VariableEnumerator extends Enumerator
+{
+    // n.b. this array is the order in which special variables will be listed
+    private static $specialNames = [
+        '_', '_e', '__out', '__function', '__method', '__class', '__namespace', '__file', '__line', '__dir',
+    ];
+
+    private $context;
+
+    /**
+     * Variable Enumerator constructor.
+     *
+     * Unlike most other enumerators, the Variable Enumerator needs access to
+     * the current scope variables, so we need to pass it a Context instance.
+     *
+     * @param Presenter $presenter
+     * @param Context   $context
+     */
+    public function __construct(Presenter $presenter, Context $context)
+    {
+        $this->context = $context;
+        parent::__construct($presenter);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list variables when no Reflector is present.
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        // only list variables if we are specifically asked
+        if (!$input->getOption('vars')) {
+            return;
+        }
+
+        $showAll   = $input->getOption('all');
+        $variables = $this->prepareVariables($this->getVariables($showAll));
+
+        if (empty($variables)) {
+            return;
+        }
+
+        return [
+            'Variables' => $variables,
+        ];
+    }
+
+    /**
+     * Get scope variables.
+     *
+     * @param bool $showAll Include special variables (e.g. $_)
+     *
+     * @return array
+     */
+    protected function getVariables($showAll)
+    {
+        $scopeVars = $this->context->getAll();
+        \uksort($scopeVars, function ($a, $b) {
+            $aIndex = \array_search($a, self::$specialNames);
+            $bIndex = \array_search($b, self::$specialNames);
+
+            if ($aIndex !== false) {
+                if ($bIndex !== false) {
+                    return $aIndex - $bIndex;
+                }
+
+                return 1;
+            }
+
+            if ($bIndex !== false) {
+                return -1;
+            }
+
+            return \strnatcasecmp($a, $b);
+        });
+
+        $ret = [];
+        foreach ($scopeVars as $name => $val) {
+            if (!$showAll && \in_array($name, self::$specialNames)) {
+                continue;
+            }
+
+            $ret[$name] = $val;
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Prepare formatted variable array.
+     *
+     * @param array $variables
+     *
+     * @return array
+     */
+    protected function prepareVariables(array $variables)
+    {
+        // My kingdom for a generator.
+        $ret = [];
+        foreach ($variables as $name => $val) {
+            if ($this->showItem($name)) {
+                $fname = '$' . $name;
+                $ret[$fname] = [
+                    'name'  => $fname,
+                    'style' => \in_array($name, self::$specialNames) ? self::IS_PRIVATE : self::IS_PUBLIC,
+                    'value' => $this->presentRef($val),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}

vendor/psy/psysh/src/Command/ParseCommand.php

@@ -0,0 +1,180 @@
+<?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\Command;
+
+use PhpParser\Node;
+use PhpParser\Parser;
+use Psy\Context;
+use Psy\ContextAware;
+use Psy\Input\CodeArgument;
+use Psy\ParserFactory;
+use Psy\VarDumper\Presenter;
+use Psy\VarDumper\PresenterAware;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\VarDumper\Caster\Caster;
+
+/**
+ * Parse PHP code and show the abstract syntax tree.
+ */
+class ParseCommand extends Command implements ContextAware, PresenterAware
+{
+    /**
+     * Context instance (for ContextAware interface).
+     *
+     * @var Context
+     */
+    protected $context;
+
+    private $presenter;
+    private $parserFactory;
+    private $parsers;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($name = null)
+    {
+        $this->parserFactory = new ParserFactory();
+        $this->parsers       = [];
+
+        parent::__construct($name);
+    }
+
+    /**
+     * ContextAware interface.
+     *
+     * @param Context $context
+     */
+    public function setContext(Context $context)
+    {
+        $this->context = $context;
+    }
+
+    /**
+     * PresenterAware interface.
+     *
+     * @param Presenter $presenter
+     */
+    public function setPresenter(Presenter $presenter)
+    {
+        $this->presenter = clone $presenter;
+        $this->presenter->addCasters([
+            'PhpParser\Node' => function (Node $node, array $a) {
+                $a = [
+                    Caster::PREFIX_VIRTUAL . 'type'       => $node->getType(),
+                    Caster::PREFIX_VIRTUAL . 'attributes' => $node->getAttributes(),
+                ];
+
+                foreach ($node->getSubNodeNames() as $name) {
+                    $a[Caster::PREFIX_VIRTUAL . $name] = $node->$name;
+                }
+
+                return $a;
+            },
+        ]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $definition = [
+            new CodeArgument('code', CodeArgument::REQUIRED, 'PHP code to parse.'),
+            new InputOption('depth', '', InputOption::VALUE_REQUIRED, 'Depth to parse.', 10),
+        ];
+
+        if ($this->parserFactory->hasKindsSupport()) {
+            $msg = 'One of PhpParser\\ParserFactory constants: '
+                . \implode(', ', ParserFactory::getPossibleKinds())
+                . " (default is based on current interpreter's version).";
+            $defaultKind = $this->parserFactory->getDefaultKind();
+
+            $definition[] = new InputOption('kind', '', InputOption::VALUE_REQUIRED, $msg, $defaultKind);
+        }
+
+        $this
+            ->setName('parse')
+            ->setDefinition($definition)
+            ->setDescription('Parse PHP code and show the abstract syntax tree.')
+            ->setHelp(
+                <<<'HELP'
+Parse PHP code and show the abstract syntax tree.
+
+This command is used in the development of PsySH. Given a string of PHP code,
+it pretty-prints the PHP Parser parse tree.
+
+See https://github.com/nikic/PHP-Parser
+
+It prolly won't be super useful for most of you, but it's here if you want to play.
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $code = $input->getArgument('code');
+        if (\strpos('<?', $code) === false) {
+            $code = '<?php ' . $code;
+        }
+
+        $parserKind = $this->parserFactory->hasKindsSupport() ? $input->getOption('kind') : null;
+        $depth      = $input->getOption('depth');
+        $nodes      = $this->parse($this->getParser($parserKind), $code);
+        $output->page($this->presenter->present($nodes, $depth));
+
+        $this->context->setReturnValue($nodes);
+    }
+
+    /**
+     * Lex and parse a string of code into statements.
+     *
+     * @param Parser $parser
+     * @param string $code
+     *
+     * @return array Statements
+     */
+    private function parse(Parser $parser, $code)
+    {
+        try {
+            return $parser->parse($code);
+        } catch (\PhpParser\Error $e) {
+            if (\strpos($e->getMessage(), 'unexpected EOF') === false) {
+                throw $e;
+            }
+
+            // If we got an unexpected EOF, let's try it again with a semicolon.
+            return $parser->parse($code . ';');
+        }
+    }
+
+    /**
+     * Get (or create) the Parser instance.
+     *
+     * @param string|null $kind One of Psy\ParserFactory constants (only for PHP parser 2.0 and above)
+     *
+     * @return Parser
+     */
+    private function getParser($kind = null)
+    {
+        if (!\array_key_exists($kind, $this->parsers)) {
+            $this->parsers[$kind] = $this->parserFactory->createParser($kind);
+        }
+
+        return $this->parsers[$kind];
+    }
+}

vendor/psy/psysh/src/Command/PsyVersionCommand.php

@@ -0,0 +1,41 @@
+<?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\Command;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * A dumb little command for printing out the current Psy Shell version.
+ */
+class PsyVersionCommand extends Command
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('version')
+            ->setDefinition([])
+            ->setDescription('Show Psy Shell version.')
+            ->setHelp('Show Psy Shell version.');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $output->writeln($this->getApplication()->getVersion());
+    }
+}

vendor/psy/psysh/src/Command/ReflectingCommand.php

@@ -0,0 +1,303 @@
+<?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\Command;
+
+use Psy\CodeCleaner\NoReturnValue;
+use Psy\Context;
+use Psy\ContextAware;
+use Psy\Exception\ErrorException;
+use Psy\Exception\RuntimeException;
+use Psy\Util\Mirror;
+
+/**
+ * An abstract command with helpers for inspecting the current context.
+ */
+abstract class ReflectingCommand extends Command implements ContextAware
+{
+    const CLASS_OR_FUNC   = '/^[\\\\\w]+$/';
+    const CLASS_MEMBER    = '/^([\\\\\w]+)::(\w+)$/';
+    const CLASS_STATIC    = '/^([\\\\\w]+)::\$(\w+)$/';
+    const INSTANCE_MEMBER = '/^(\$\w+)(::|->)(\w+)$/';
+
+    /**
+     * Context instance (for ContextAware interface).
+     *
+     * @var Context
+     */
+    protected $context;
+
+    /**
+     * ContextAware interface.
+     *
+     * @param Context $context
+     */
+    public function setContext(Context $context)
+    {
+        $this->context = $context;
+    }
+
+    /**
+     * Get the target for a value.
+     *
+     * @throws \InvalidArgumentException when the value specified can't be resolved
+     *
+     * @param string $valueName Function, class, variable, constant, method or property name
+     *
+     * @return array (class or instance name, member name, kind)
+     */
+    protected function getTarget($valueName)
+    {
+        $valueName = \trim($valueName);
+        $matches   = [];
+        switch (true) {
+            case \preg_match(self::CLASS_OR_FUNC, $valueName, $matches):
+                return [$this->resolveName($matches[0], true), null, 0];
+
+            case \preg_match(self::CLASS_MEMBER, $valueName, $matches):
+                return [$this->resolveName($matches[1]), $matches[2], Mirror::CONSTANT | Mirror::METHOD];
+
+            case \preg_match(self::CLASS_STATIC, $valueName, $matches):
+                return [$this->resolveName($matches[1]), $matches[2], Mirror::STATIC_PROPERTY | Mirror::PROPERTY];
+
+            case \preg_match(self::INSTANCE_MEMBER, $valueName, $matches):
+                if ($matches[2] === '->') {
+                    $kind = Mirror::METHOD | Mirror::PROPERTY;
+                } else {
+                    $kind = Mirror::CONSTANT | Mirror::METHOD;
+                }
+
+                return [$this->resolveObject($matches[1]), $matches[3], $kind];
+
+            default:
+                return [$this->resolveObject($valueName), null, 0];
+        }
+    }
+
+    /**
+     * Resolve a class or function name (with the current shell namespace).
+     *
+     * @throws ErrorException when `self` or `static` is used in a non-class scope
+     *
+     * @param string $name
+     * @param bool   $includeFunctions (default: false)
+     *
+     * @return string
+     */
+    protected function resolveName($name, $includeFunctions = false)
+    {
+        $shell = $this->getApplication();
+
+        // While not *technically* 100% accurate, let's treat `self` and `static` as equivalent.
+        if (\in_array(\strtolower($name), ['self', 'static'])) {
+            if ($boundClass = $shell->getBoundClass()) {
+                return $boundClass;
+            }
+
+            if ($boundObject = $shell->getBoundObject()) {
+                return \get_class($boundObject);
+            }
+
+            $msg = \sprintf('Cannot use "%s" when no class scope is active', \strtolower($name));
+            throw new ErrorException($msg, 0, E_USER_ERROR, "eval()'d code", 1);
+        }
+
+        if (\substr($name, 0, 1) === '\\') {
+            return $name;
+        }
+
+        if ($namespace = $shell->getNamespace()) {
+            $fullName = $namespace . '\\' . $name;
+
+            if (\class_exists($fullName) || \interface_exists($fullName) || ($includeFunctions && \function_exists($fullName))) {
+                return $fullName;
+            }
+        }
+
+        return $name;
+    }
+
+    /**
+     * Get a Reflector and documentation for a function, class or instance, constant, method or property.
+     *
+     * @param string $valueName Function, class, variable, constant, method or property name
+     *
+     * @return array (value, Reflector)
+     */
+    protected function getTargetAndReflector($valueName)
+    {
+        list($value, $member, $kind) = $this->getTarget($valueName);
+
+        return [$value, Mirror::get($value, $member, $kind)];
+    }
+
+    /**
+     * Resolve code to a value in the current scope.
+     *
+     * @throws RuntimeException when the code does not return a value in the current scope
+     *
+     * @param string $code
+     *
+     * @return mixed Variable value
+     */
+    protected function resolveCode($code)
+    {
+        try {
+            $value = $this->getApplication()->execute($code, true);
+        } catch (\Exception $e) {
+            // Swallow all exceptions?
+        }
+
+        if (!isset($value) || $value instanceof NoReturnValue) {
+            throw new RuntimeException('Unknown target: ' . $code);
+        }
+
+        return $value;
+    }
+
+    /**
+     * Resolve code to an object in the current scope.
+     *
+     * @throws RuntimeException when the code resolves to a non-object value
+     *
+     * @param string $code
+     *
+     * @return object Variable instance
+     */
+    private function resolveObject($code)
+    {
+        $value = $this->resolveCode($code);
+
+        if (!\is_object($value)) {
+            throw new RuntimeException('Unable to inspect a non-object');
+        }
+
+        return $value;
+    }
+
+    /**
+     * @deprecated Use `resolveCode` instead
+     *
+     * @param string $name
+     *
+     * @return mixed Variable instance
+     */
+    protected function resolveInstance($name)
+    {
+        @\trigger_error('`resolveInstance` is deprecated; use `resolveCode` instead.', E_USER_DEPRECATED);
+
+        return $this->resolveCode($name);
+    }
+
+    /**
+     * Get a variable from the current shell scope.
+     *
+     * @param string $name
+     *
+     * @return mixed
+     */
+    protected function getScopeVariable($name)
+    {
+        return $this->context->get($name);
+    }
+
+    /**
+     * Get all scope variables from the current shell scope.
+     *
+     * @return array
+     */
+    protected function getScopeVariables()
+    {
+        return $this->context->getAll();
+    }
+
+    /**
+     * Given a Reflector instance, set command-scope variables in the shell
+     * execution context. This is used to inject magic $__class, $__method and
+     * $__file variables (as well as a handful of others).
+     *
+     * @param \Reflector $reflector
+     */
+    protected function setCommandScopeVariables(\Reflector $reflector)
+    {
+        $vars = [];
+
+        switch (\get_class($reflector)) {
+            case 'ReflectionClass':
+            case 'ReflectionObject':
+                $vars['__class'] = $reflector->name;
+                if ($reflector->inNamespace()) {
+                    $vars['__namespace'] = $reflector->getNamespaceName();
+                }
+                break;
+
+            case 'ReflectionMethod':
+                $vars['__method'] = \sprintf('%s::%s', $reflector->class, $reflector->name);
+                $vars['__class'] = $reflector->class;
+                $classReflector = $reflector->getDeclaringClass();
+                if ($classReflector->inNamespace()) {
+                    $vars['__namespace'] = $classReflector->getNamespaceName();
+                }
+                break;
+
+            case 'ReflectionFunction':
+                $vars['__function'] = $reflector->name;
+                if ($reflector->inNamespace()) {
+                    $vars['__namespace'] = $reflector->getNamespaceName();
+                }
+                break;
+
+            case 'ReflectionGenerator':
+                $funcReflector = $reflector->getFunction();
+                $vars['__function'] = $funcReflector->name;
+                if ($funcReflector->inNamespace()) {
+                    $vars['__namespace'] = $funcReflector->getNamespaceName();
+                }
+                if ($fileName = $reflector->getExecutingFile()) {
+                    $vars['__file'] = $fileName;
+                    $vars['__line'] = $reflector->getExecutingLine();
+                    $vars['__dir']  = \dirname($fileName);
+                }
+                break;
+
+            case 'ReflectionProperty':
+            case 'ReflectionClassConstant':
+            case 'Psy\Reflection\ReflectionClassConstant':
+                $classReflector = $reflector->getDeclaringClass();
+                $vars['__class'] = $classReflector->name;
+                if ($classReflector->inNamespace()) {
+                    $vars['__namespace'] = $classReflector->getNamespaceName();
+                }
+                // no line for these, but this'll do
+                if ($fileName = $reflector->getDeclaringClass()->getFileName()) {
+                    $vars['__file'] = $fileName;
+                    $vars['__dir']  = \dirname($fileName);
+                }
+                break;
+
+            case 'Psy\Reflection\ReflectionConstant_':
+                if ($reflector->inNamespace()) {
+                    $vars['__namespace'] = $reflector->getNamespaceName();
+                }
+                break;
+        }
+
+        if ($reflector instanceof \ReflectionClass || $reflector instanceof \ReflectionFunctionAbstract) {
+            if ($fileName = $reflector->getFileName()) {
+                $vars['__file'] = $fileName;
+                $vars['__line'] = $reflector->getStartLine();
+                $vars['__dir']  = \dirname($fileName);
+            }
+        }
+
+        $this->context->setCommandScopeVariables($vars);
+    }
+}

vendor/psy/psysh/src/Command/ShowCommand.php

@@ -0,0 +1,289 @@
+<?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\Command;
+
+use JakubOnderka\PhpConsoleHighlighter\Highlighter;
+use Psy\Configuration;
+use Psy\ConsoleColorFactory;
+use Psy\Exception\RuntimeException;
+use Psy\Formatter\CodeFormatter;
+use Psy\Formatter\SignatureFormatter;
+use Psy\Input\CodeArgument;
+use Psy\Output\ShellOutput;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Show the code for an object, class, constant, method or property.
+ */
+class ShowCommand extends ReflectingCommand
+{
+    private $colorMode;
+    private $highlighter;
+    private $lastException;
+    private $lastExceptionIndex;
+
+    /**
+     * @param null|string $colorMode (default: null)
+     */
+    public function __construct($colorMode = null)
+    {
+        $this->colorMode = $colorMode ?: Configuration::COLOR_MODE_AUTO;
+
+        parent::__construct();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('show')
+            ->setDefinition([
+                new CodeArgument('target', CodeArgument::OPTIONAL, 'Function, class, instance, constant, method or property to show.'),
+                new InputOption('ex', null,  InputOption::VALUE_OPTIONAL, 'Show last exception context. Optionally specify a stack index.', 1),
+            ])
+            ->setDescription('Show the code for an object, class, constant, method or property.')
+            ->setHelp(
+                <<<HELP
+Show the code for an object, class, constant, method or property, or the context
+of the last exception.
+
+<return>cat --ex</return> defaults to showing the lines surrounding the location of the last
+exception. Invoking it more than once travels up the exception's stack trace,
+and providing a number shows the context of the given index of the trace.
+
+e.g.
+<return>>>> show \$myObject</return>
+<return>>>> show Psy\Shell::debug</return>
+<return>>>> show --ex</return>
+<return>>>> show --ex 3</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        // n.b. As far as I can tell, InputInterface doesn't want to tell me
+        // whether an option with an optional value was actually passed. If you
+        // call `$input->getOption('ex')`, it will return the default, both when
+        // `--ex` is specified with no value, and when `--ex` isn't specified at
+        // all.
+        //
+        // So we're doing something sneaky here. If we call `getOptions`, it'll
+        // return the default value when `--ex` is not present, and `null` if
+        // `--ex` is passed with no value. /shrug
+        $opts = $input->getOptions();
+
+        // Strict comparison to `1` (the default value) here, because `--ex 1`
+        // will come in as `"1"`. Now we can tell the difference between
+        // "no --ex present", because it's the integer 1, "--ex with no value",
+        // because it's `null`, and "--ex 1", because it's the string "1".
+        if ($opts['ex'] !== 1) {
+            if ($input->getArgument('target')) {
+                throw new \InvalidArgumentException('Too many arguments (supply either "target" or "--ex")');
+            }
+
+            return $this->writeExceptionContext($input, $output);
+        }
+
+        if ($input->getArgument('target')) {
+            return $this->writeCodeContext($input, $output);
+        }
+
+        throw new RuntimeException('Not enough arguments (missing: "target")');
+    }
+
+    private function writeCodeContext(InputInterface $input, OutputInterface $output)
+    {
+        list($target, $reflector) = $this->getTargetAndReflector($input->getArgument('target'));
+
+        // Set some magic local variables
+        $this->setCommandScopeVariables($reflector);
+
+        try {
+            $output->page(CodeFormatter::format($reflector, $this->colorMode), ShellOutput::OUTPUT_RAW);
+        } catch (RuntimeException $e) {
+            $output->writeln(SignatureFormatter::format($reflector));
+            throw $e;
+        }
+    }
+
+    private function writeExceptionContext(InputInterface $input, OutputInterface $output)
+    {
+        $exception = $this->context->getLastException();
+        if ($exception !== $this->lastException) {
+            $this->lastException = null;
+            $this->lastExceptionIndex = null;
+        }
+
+        $opts = $input->getOptions();
+        if ($opts['ex'] === null) {
+            if ($this->lastException && $this->lastExceptionIndex !== null) {
+                $index = $this->lastExceptionIndex + 1;
+            } else {
+                $index = 0;
+            }
+        } else {
+            $index = \max(0, \intval($input->getOption('ex')) - 1);
+        }
+
+        $trace = $exception->getTrace();
+        \array_unshift($trace, [
+            'file' => $exception->getFile(),
+            'line' => $exception->getLine(),
+        ]);
+
+        if ($index >= \count($trace)) {
+            $index = 0;
+        }
+
+        $this->lastException = $exception;
+        $this->lastExceptionIndex = $index;
+
+        $output->writeln($this->getApplication()->formatException($exception));
+        $output->writeln('--');
+        $this->writeTraceLine($output, $trace, $index);
+        $this->writeTraceCodeSnippet($output, $trace, $index);
+
+        $this->setCommandScopeVariablesFromContext($trace[$index]);
+    }
+
+    private function writeTraceLine(OutputInterface $output, array $trace, $index)
+    {
+        $file = isset($trace[$index]['file']) ? $this->replaceCwd($trace[$index]['file']) : 'n/a';
+        $line = isset($trace[$index]['line']) ? $trace[$index]['line'] : 'n/a';
+
+        $output->writeln(\sprintf(
+            'From <info>%s:%d</info> at <strong>level %d</strong> of backtrace (of %d).',
+            OutputFormatter::escape($file),
+            OutputFormatter::escape($line),
+            $index + 1,
+            \count($trace)
+        ));
+    }
+
+    private function replaceCwd($file)
+    {
+        if ($cwd = \getcwd()) {
+            $cwd = \rtrim($cwd, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
+        }
+
+        if ($cwd === false) {
+            return $file;
+        } else {
+            return \preg_replace('/^' . \preg_quote($cwd, '/') . '/', '', $file);
+        }
+    }
+
+    private function writeTraceCodeSnippet(OutputInterface $output, array $trace, $index)
+    {
+        if (!isset($trace[$index]['file'])) {
+            return;
+        }
+
+        $file = $trace[$index]['file'];
+        if ($fileAndLine = $this->extractEvalFileAndLine($file)) {
+            list($file, $line) = $fileAndLine;
+        } else {
+            if (!isset($trace[$index]['line'])) {
+                return;
+            }
+
+            $line = $trace[$index]['line'];
+        }
+
+        if (\is_file($file)) {
+            $code = @\file_get_contents($file);
+        }
+
+        if (empty($code)) {
+            return;
+        }
+
+        $output->write($this->getHighlighter()->getCodeSnippet($code, $line, 5, 5), ShellOutput::OUTPUT_RAW);
+    }
+
+    private function getHighlighter()
+    {
+        if (!$this->highlighter) {
+            $factory = new ConsoleColorFactory($this->colorMode);
+            $this->highlighter = new Highlighter($factory->getConsoleColor());
+        }
+
+        return $this->highlighter;
+    }
+
+    private function setCommandScopeVariablesFromContext(array $context)
+    {
+        $vars = [];
+
+        if (isset($context['class'])) {
+            $vars['__class'] = $context['class'];
+            if (isset($context['function'])) {
+                $vars['__method'] = $context['function'];
+            }
+
+            try {
+                $refl = new \ReflectionClass($context['class']);
+                if ($namespace = $refl->getNamespaceName()) {
+                    $vars['__namespace'] = $namespace;
+                }
+            } catch (\Exception $e) {
+                // oh well
+            }
+        } elseif (isset($context['function'])) {
+            $vars['__function'] = $context['function'];
+
+            try {
+                $refl = new \ReflectionFunction($context['function']);
+                if ($namespace = $refl->getNamespaceName()) {
+                    $vars['__namespace'] = $namespace;
+                }
+            } catch (\Exception $e) {
+                // oh well
+            }
+        }
+
+        if (isset($context['file'])) {
+            $file = $context['file'];
+            if ($fileAndLine = $this->extractEvalFileAndLine($file)) {
+                list($file, $line) = $fileAndLine;
+            } elseif (isset($context['line'])) {
+                $line = $context['line'];
+            }
+
+            if (\is_file($file)) {
+                $vars['__file'] = $file;
+                if (isset($line)) {
+                    $vars['__line'] = $line;
+                }
+                $vars['__dir'] = \dirname($file);
+            }
+        }
+
+        $this->context->setCommandScopeVariables($vars);
+    }
+
+    private function extractEvalFileAndLine($file)
+    {
+        if (\preg_match('/(.*)\\((\\d+)\\) : eval\\(\\)\'d code$/', $file, $matches)) {
+            return [$matches[1], $matches[2]];
+        }
+    }
+}

vendor/psy/psysh/src/Command/SudoCommand.php

@@ -0,0 +1,143 @@
+<?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\Command;
+
+use PhpParser\NodeTraverser;
+use PhpParser\PrettyPrinter\Standard as Printer;
+use Psy\Input\CodeArgument;
+use Psy\ParserFactory;
+use Psy\Readline\Readline;
+use Psy\Sudo\SudoVisitor;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Evaluate PHP code, bypassing visibility restrictions.
+ */
+class SudoCommand extends Command
+{
+    private $readline;
+    private $parser;
+    private $traverser;
+    private $printer;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($name = null)
+    {
+        $parserFactory = new ParserFactory();
+        $this->parser = $parserFactory->createParser();
+
+        $this->traverser = new NodeTraverser();
+        $this->traverser->addVisitor(new SudoVisitor());
+
+        $this->printer = new Printer();
+
+        parent::__construct($name);
+    }
+
+    /**
+     * Set the Shell's Readline service.
+     *
+     * @param Readline $readline
+     */
+    public function setReadline(Readline $readline)
+    {
+        $this->readline = $readline;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('sudo')
+            ->setDefinition([
+                new CodeArgument('code', CodeArgument::REQUIRED, 'Code to execute.'),
+            ])
+            ->setDescription('Evaluate PHP code, bypassing visibility restrictions.')
+            ->setHelp(
+                <<<'HELP'
+Evaluate PHP code, bypassing visibility restrictions.
+
+e.g.
+<return>>>> $sekret->whisper("hi")</return>
+<return>PHP error:  Call to private method Sekret::whisper() from context '' on line 1</return>
+
+<return>>>> sudo $sekret->whisper("hi")</return>
+<return>=> "hi"</return>
+
+<return>>>> $sekret->word</return>
+<return>PHP error:  Cannot access private property Sekret::$word on line 1</return>
+
+<return>>>> sudo $sekret->word</return>
+<return>=> "hi"</return>
+
+<return>>>> $sekret->word = "please"</return>
+<return>PHP error:  Cannot access private property Sekret::$word on line 1</return>
+
+<return>>>> sudo $sekret->word = "please"</return>
+<return>=> "please"</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $code = $input->getArgument('code');
+
+        // special case for !!
+        if ($code === '!!') {
+            $history = $this->readline->listHistory();
+            if (\count($history) < 2) {
+                throw new \InvalidArgumentException('No previous command to replay');
+            }
+            $code = $history[\count($history) - 2];
+        }
+
+        if (\strpos('<?', $code) === false) {
+            $code = '<?php ' . $code;
+        }
+
+        $nodes = $this->traverser->traverse($this->parse($code));
+
+        $sudoCode = $this->printer->prettyPrint($nodes);
+        $shell = $this->getApplication();
+        $shell->addCode($sudoCode, !$shell->hasCode());
+    }
+
+    /**
+     * Lex and parse a string of code into statements.
+     *
+     * @param string $code
+     *
+     * @return array Statements
+     */
+    private function parse($code)
+    {
+        try {
+            return $this->parser->parse($code);
+        } catch (\PhpParser\Error $e) {
+            if (\strpos($e->getMessage(), 'unexpected EOF') === false) {
+                throw $e;
+            }
+
+            // If we got an unexpected EOF, let's try it again with a semicolon.
+            return $this->parser->parse($code . ';');
+        }
+    }
+}

vendor/psy/psysh/src/Command/ThrowUpCommand.php

@@ -0,0 +1,172 @@
+<?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\Command;
+
+use PhpParser\Node\Arg;
+use PhpParser\Node\Expr\New_;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Expr\Variable;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+use PhpParser\Node\Scalar\String_;
+use PhpParser\Node\Stmt\Throw_;
+use PhpParser\PrettyPrinter\Standard as Printer;
+use Psy\Context;
+use Psy\ContextAware;
+use Psy\Input\CodeArgument;
+use Psy\ParserFactory;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Throw an exception or error out of the Psy Shell.
+ */
+class ThrowUpCommand extends Command implements ContextAware
+{
+    const THROW_CLASS = 'Psy\Exception\ThrowUpException';
+
+    private $parser;
+    private $printer;
+
+    /**
+     * Context instance (for ContextAware interface).
+     *
+     * @var Context
+     */
+    protected $context;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($name = null)
+    {
+        $parserFactory = new ParserFactory();
+
+        $this->parser  = $parserFactory->createParser();
+        $this->printer = new Printer();
+
+        parent::__construct($name);
+    }
+
+    /**
+     * ContextAware interface.
+     *
+     * @param Context $context
+     */
+    public function setContext(Context $context)
+    {
+        $this->context = $context;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('throw-up')
+            ->setDefinition([
+                new CodeArgument('exception', CodeArgument::OPTIONAL, 'Exception or Error to throw.'),
+            ])
+            ->setDescription('Throw an exception or error out of the Psy Shell.')
+            ->setHelp(
+                <<<'HELP'
+Throws an exception or error out of the current the Psy Shell instance.
+
+By default it throws the most recent exception.
+
+e.g.
+<return>>>> throw-up</return>
+<return>>>> throw-up $e</return>
+<return>>>> throw-up new Exception('WHEEEEEE!')</return>
+<return>>>> throw-up "bye!"</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws InvalidArgumentException if there is no exception to throw
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $args = $this->prepareArgs($input->getArgument('exception'));
+        $throwStmt = new Throw_(new StaticCall(new FullyQualifiedName(self::THROW_CLASS), 'fromThrowable', $args));
+        $throwCode = $this->printer->prettyPrint([$throwStmt]);
+
+        $shell = $this->getApplication();
+        $shell->addCode($throwCode, !$shell->hasCode());
+    }
+
+    /**
+     * Parse the supplied command argument.
+     *
+     * If no argument was given, this falls back to `$_e`
+     *
+     * @throws InvalidArgumentException if there is no exception to throw
+     *
+     * @param string $code
+     *
+     * @return Arg[]
+     */
+    private function prepareArgs($code = null)
+    {
+        if (!$code) {
+            // Default to last exception if nothing else was supplied
+            return [new Arg(new Variable('_e'))];
+        }
+
+        if (\strpos('<?', $code) === false) {
+            $code = '<?php ' . $code;
+        }
+
+        $nodes = $this->parse($code);
+        if (\count($nodes) !== 1) {
+            throw new \InvalidArgumentException('No idea how to throw this');
+        }
+
+        $node = $nodes[0];
+
+        // Make this work for PHP Parser v3.x
+        $expr = isset($node->expr) ? $node->expr : $node;
+
+        $args = [new Arg($expr, false, false, $node->getAttributes())];
+
+        // Allow throwing via a string, e.g. `throw-up "SUP"`
+        if ($expr instanceof String_) {
+            return [new New_(new FullyQualifiedName('Exception'), $args)];
+        }
+
+        return $args;
+    }
+
+    /**
+     * Lex and parse a string of code into statements.
+     *
+     * @param string $code
+     *
+     * @return array Statements
+     */
+    private function parse($code)
+    {
+        try {
+            return $this->parser->parse($code);
+        } catch (\PhpParser\Error $e) {
+            if (\strpos($e->getMessage(), 'unexpected EOF') === false) {
+                throw $e;
+            }
+
+            // If we got an unexpected EOF, let's try it again with a semicolon.
+            return $this->parser->parse($code . ';');
+        }
+    }
+}

vendor/psy/psysh/src/Command/TimeitCommand.php

@@ -0,0 +1,195 @@
+<?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\Command;
+
+use PhpParser\NodeTraverser;
+use PhpParser\PrettyPrinter\Standard as Printer;
+use Psy\Command\TimeitCommand\TimeitVisitor;
+use Psy\Input\CodeArgument;
+use Psy\ParserFactory;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Class TimeitCommand.
+ */
+class TimeitCommand extends Command
+{
+    const RESULT_MSG     = '<info>Command took %.6f seconds to complete.</info>';
+    const AVG_RESULT_MSG = '<info>Command took %.6f seconds on average (%.6f median; %.6f total) to complete.</info>';
+
+    private static $start = null;
+    private static $times = [];
+
+    private $parser;
+    private $traverser;
+    private $printer;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($name = null)
+    {
+        $parserFactory = new ParserFactory();
+        $this->parser = $parserFactory->createParser();
+
+        $this->traverser = new NodeTraverser();
+        $this->traverser->addVisitor(new TimeitVisitor());
+
+        $this->printer = new Printer();
+
+        parent::__construct($name);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('timeit')
+            ->setDefinition([
+                new InputOption('num', 'n', InputOption::VALUE_REQUIRED, 'Number of iterations.'),
+                new CodeArgument('code', CodeArgument::REQUIRED, 'Code to execute.'),
+            ])
+            ->setDescription('Profiles with a timer.')
+            ->setHelp(
+                <<<'HELP'
+Time profiling for functions and commands.
+
+e.g.
+<return>>>> timeit sleep(1)</return>
+<return>>>> timeit -n1000 $closure()</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $code = $input->getArgument('code');
+        $num = $input->getOption('num') ?: 1;
+        $shell = $this->getApplication();
+
+        $instrumentedCode = $this->instrumentCode($code);
+
+        self::$times = [];
+
+        for ($i = 0; $i < $num; $i++) {
+            $_ = $shell->execute($instrumentedCode);
+            $this->ensureEndMarked();
+        }
+
+        $shell->writeReturnValue($_);
+
+        $times = self::$times;
+        self::$times = [];
+
+        if ($num === 1) {
+            $output->writeln(\sprintf(self::RESULT_MSG, $times[0]));
+        } else {
+            $total = \array_sum($times);
+            \rsort($times);
+            $median = $times[\round($num / 2)];
+
+            $output->writeln(\sprintf(self::AVG_RESULT_MSG, $total / $num, $median, $total));
+        }
+    }
+
+    /**
+     * Internal method for marking the start of timeit execution.
+     *
+     * A static call to this method will be injected at the start of the timeit
+     * input code to instrument the call. We will use the saved start time to
+     * more accurately calculate time elapsed during execution.
+     */
+    public static function markStart()
+    {
+        self::$start = \microtime(true);
+    }
+
+    /**
+     * Internal method for marking the end of timeit execution.
+     *
+     * A static call to this method is injected by TimeitVisitor at the end
+     * of the timeit input code to instrument the call.
+     *
+     * Note that this accepts an optional $ret parameter, which is used to pass
+     * the return value of the last statement back out of timeit. This saves us
+     * a bunch of code rewriting shenanigans.
+     *
+     * @param mixed $ret
+     *
+     * @return mixed it just passes $ret right back
+     */
+    public static function markEnd($ret = null)
+    {
+        self::$times[] = \microtime(true) - self::$start;
+        self::$start = null;
+
+        return $ret;
+    }
+
+    /**
+     * Ensure that the end of code execution was marked.
+     *
+     * The end *should* be marked in the instrumented code, but just in case
+     * we'll add a fallback here.
+     */
+    private function ensureEndMarked()
+    {
+        if (self::$start !== null) {
+            self::markEnd();
+        }
+    }
+
+    /**
+     * Instrument code for timeit execution.
+     *
+     * This inserts `markStart` and `markEnd` calls to ensure that (reasonably)
+     * accurate times are recorded for just the code being executed.
+     *
+     * @param string $code
+     *
+     * @return string
+     */
+    private function instrumentCode($code)
+    {
+        return $this->printer->prettyPrint($this->traverser->traverse($this->parse($code)));
+    }
+
+    /**
+     * Lex and parse a string of code into statements.
+     *
+     * @param string $code
+     *
+     * @return array Statements
+     */
+    private function parse($code)
+    {
+        $code = '<?php ' . $code;
+
+        try {
+            return $this->parser->parse($code);
+        } catch (\PhpParser\Error $e) {
+            if (\strpos($e->getMessage(), 'unexpected EOF') === false) {
+                throw $e;
+            }
+
+            // If we got an unexpected EOF, let's try it again with a semicolon.
+            return $this->parser->parse($code . ';');
+        }
+    }
+}

vendor/psy/psysh/src/Command/TimeitCommand/TimeitVisitor.php

@@ -0,0 +1,139 @@
+<?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\Command\TimeitCommand;
+
+use PhpParser\Node;
+use PhpParser\Node\Arg;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\FunctionLike;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+use PhpParser\Node\Stmt\Expression;
+use PhpParser\Node\Stmt\Return_;
+use PhpParser\NodeVisitorAbstract;
+use Psy\CodeCleaner\NoReturnValue;
+
+/**
+ * A node visitor for instrumenting code to be executed by the `timeit` command.
+ *
+ * Injects `TimeitCommand::markStart()` at the start of code to be executed, and
+ * `TimeitCommand::markEnd()` at the end, and on top-level return statements.
+ */
+class TimeitVisitor extends NodeVisitorAbstract
+{
+    private $functionDepth;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->functionDepth = 0;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function enterNode(Node $node)
+    {
+        // keep track of nested function-like nodes, because they can have
+        // returns statements... and we don't want to call markEnd for those.
+        if ($node instanceof FunctionLike) {
+            $this->functionDepth++;
+
+            return;
+        }
+
+        // replace any top-level `return` statements with a `markEnd` call
+        if ($this->functionDepth === 0 && $node instanceof Return_) {
+            return new Return_($this->getEndCall($node->expr), $node->getAttributes());
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof FunctionLike) {
+            $this->functionDepth--;
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function afterTraverse(array $nodes)
+    {
+        // prepend a `markStart` call
+        \array_unshift($nodes, $this->maybeExpression($this->getStartCall()));
+
+        // append a `markEnd` call (wrapping the final node, if it's an expression)
+        $last = $nodes[\count($nodes) - 1];
+        if ($last instanceof Expr) {
+            \array_pop($nodes);
+            $nodes[] = $this->getEndCall($last);
+        } elseif ($last instanceof Expression) {
+            \array_pop($nodes);
+            $nodes[] = new Expression($this->getEndCall($last->expr), $last->getAttributes());
+        } elseif ($last instanceof Return_) {
+            // nothing to do here, we're already ending with a return call
+        } else {
+            $nodes[] = $this->maybeExpression($this->getEndCall());
+        }
+
+        return $nodes;
+    }
+
+    /**
+     * Get PhpParser AST nodes for a `markStart` call.
+     *
+     * @return PhpParser\Node\Expr\StaticCall
+     */
+    private function getStartCall()
+    {
+        return new StaticCall(new FullyQualifiedName('Psy\Command\TimeitCommand'), 'markStart');
+    }
+
+    /**
+     * Get PhpParser AST nodes for a `markEnd` call.
+     *
+     * Optionally pass in a return value.
+     *
+     * @param Expr|null $arg
+     *
+     * @return PhpParser\Node\Expr\StaticCall
+     */
+    private function getEndCall(Expr $arg = null)
+    {
+        if ($arg === null) {
+            $arg = NoReturnValue::create();
+        }
+
+        return new StaticCall(new FullyQualifiedName('Psy\Command\TimeitCommand'), 'markEnd', [new Arg($arg)]);
+    }
+
+    /**
+     * Compatibility shim for PHP Parser 3.x.
+     *
+     * Wrap $expr in a PhpParser\Node\Stmt\Expression if the class exists.
+     *
+     * @param PhpParser\Node $expr
+     * @param array          $attrs
+     *
+     * @return PhpParser\Node\Expr|PhpParser\Node\Stmt\Expression
+     */
+    private function maybeExpression($expr, $attrs = [])
+    {
+        return \class_exists('PhpParser\Node\Stmt\Expression') ? new Expression($expr, $attrs) : $expr;
+    }
+}

vendor/psy/psysh/src/Command/TraceCommand.php

@@ -0,0 +1,167 @@
+<?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\Command;
+
+use Psy\Input\FilterOptions;
+use Psy\Output\ShellOutput;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Show the current stack trace.
+ */
+class TraceCommand extends Command
+{
+    protected $filter;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($name = null)
+    {
+        $this->filter = new FilterOptions();
+
+        parent::__construct($name);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        list($grep, $insensitive, $invert) = FilterOptions::getOptions();
+
+        $this
+            ->setName('trace')
+            ->setDefinition([
+                new InputOption('include-psy', 'p', InputOption::VALUE_NONE,     'Include Psy in the call stack.'),
+                new InputOption('num',         'n', InputOption::VALUE_REQUIRED, 'Only include NUM lines.'),
+
+                $grep,
+                $insensitive,
+                $invert,
+            ])
+            ->setDescription('Show the current call stack.')
+            ->setHelp(
+                <<<'HELP'
+Show the current call stack.
+
+Optionally, include PsySH in the call stack by passing the <info>--include-psy</info> option.
+
+e.g.
+<return>> trace -n10</return>
+<return>> trace --include-psy</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->filter->bind($input);
+        $trace = $this->getBacktrace(new \Exception(), $input->getOption('num'), $input->getOption('include-psy'));
+        $output->page($trace, ShellOutput::NUMBER_LINES);
+    }
+
+    /**
+     * Get a backtrace for an exception.
+     *
+     * Optionally limit the number of rows to include with $count, and exclude
+     * Psy from the trace.
+     *
+     * @param \Exception $e          The exception with a backtrace
+     * @param int        $count      (default: PHP_INT_MAX)
+     * @param bool       $includePsy (default: true)
+     *
+     * @return array Formatted stacktrace lines
+     */
+    protected function getBacktrace(\Exception $e, $count = null, $includePsy = true)
+    {
+        if ($cwd = \getcwd()) {
+            $cwd = \rtrim($cwd, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
+        }
+
+        if ($count === null) {
+            $count = PHP_INT_MAX;
+        }
+
+        $lines = [];
+
+        $trace = $e->getTrace();
+        \array_unshift($trace, [
+            'function' => '',
+            'file'     => $e->getFile() !== null ? $e->getFile() : 'n/a',
+            'line'     => $e->getLine() !== null ? $e->getLine() : 'n/a',
+            'args'     => [],
+        ]);
+
+        if (!$includePsy) {
+            for ($i = \count($trace) - 1; $i >= 0; $i--) {
+                $thing = isset($trace[$i]['class']) ? $trace[$i]['class'] : $trace[$i]['function'];
+                if (\preg_match('/\\\\?Psy\\\\/', $thing)) {
+                    $trace = \array_slice($trace, $i + 1);
+                    break;
+                }
+            }
+        }
+
+        for ($i = 0, $count = \min($count, \count($trace)); $i < $count; $i++) {
+            $class    = isset($trace[$i]['class']) ? $trace[$i]['class'] : '';
+            $type     = isset($trace[$i]['type']) ? $trace[$i]['type'] : '';
+            $function = $trace[$i]['function'];
+            $file     = isset($trace[$i]['file']) ? $this->replaceCwd($cwd, $trace[$i]['file']) : 'n/a';
+            $line     = isset($trace[$i]['line']) ? $trace[$i]['line'] : 'n/a';
+
+            // Leave execution loop out of the `eval()'d code` lines
+            if (\preg_match("#/src/Execution(?:Loop)?Closure.php\(\d+\) : eval\(\)'d code$#", \str_replace('\\', '/', $file))) {
+                $file = "eval()'d code";
+            }
+
+            // Skip any lines that don't match our filter options
+            if (!$this->filter->match(\sprintf('%s%s%s() at %s:%s', $class, $type, $function, $file, $line))) {
+                continue;
+            }
+
+            $lines[] = \sprintf(
+                ' <class>%s</class>%s%s() at <info>%s:%s</info>',
+                OutputFormatter::escape($class),
+                OutputFormatter::escape($type),
+                OutputFormatter::escape($function),
+                OutputFormatter::escape($file),
+                OutputFormatter::escape($line)
+            );
+        }
+
+        return $lines;
+    }
+
+    /**
+     * Replace the given directory from the start of a filepath.
+     *
+     * @param string $cwd
+     * @param string $file
+     *
+     * @return string
+     */
+    private function replaceCwd($cwd, $file)
+    {
+        if ($cwd === false) {
+            return $file;
+        } else {
+            return \preg_replace('/^' . \preg_quote($cwd, '/') . '/', '', $file);
+        }
+    }
+}

vendor/psy/psysh/src/Command/WhereamiCommand.php

@@ -0,0 +1,148 @@
+<?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\Command;
+
+use JakubOnderka\PhpConsoleHighlighter\Highlighter;
+use Psy\Configuration;
+use Psy\ConsoleColorFactory;
+use Psy\Output\ShellOutput;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Show the context of where you opened the debugger.
+ */
+class WhereamiCommand extends Command
+{
+    private $colorMode;
+    private $backtrace;
+
+    /**
+     * @param null|string $colorMode (default: null)
+     */
+    public function __construct($colorMode = null)
+    {
+        $this->colorMode = $colorMode ?: Configuration::COLOR_MODE_AUTO;
+        $this->backtrace = \debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
+
+        parent::__construct();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('whereami')
+            ->setDefinition([
+                new InputOption('num', 'n', InputOption::VALUE_OPTIONAL, 'Number of lines before and after.', '5'),
+            ])
+            ->setDescription('Show where you are in the code.')
+            ->setHelp(
+                <<<'HELP'
+Show where you are in the code.
+
+Optionally, include how many lines before and after you want to display.
+
+e.g.
+<return>> whereami </return>
+<return>> whereami -n10</return>
+HELP
+            );
+    }
+
+    /**
+     * Obtains the correct stack frame in the full backtrace.
+     *
+     * @return array
+     */
+    protected function trace()
+    {
+        foreach (\array_reverse($this->backtrace) as $stackFrame) {
+            if ($this->isDebugCall($stackFrame)) {
+                return $stackFrame;
+            }
+        }
+
+        return \end($this->backtrace);
+    }
+
+    private static function isDebugCall(array $stackFrame)
+    {
+        $class    = isset($stackFrame['class']) ? $stackFrame['class'] : null;
+        $function = isset($stackFrame['function']) ? $stackFrame['function'] : null;
+
+        return ($class === null && $function === 'Psy\debug') ||
+            ($class === 'Psy\Shell' && \in_array($function, ['__construct', 'debug']));
+    }
+
+    /**
+     * Determine the file and line based on the specific backtrace.
+     *
+     * @return array
+     */
+    protected function fileInfo()
+    {
+        $stackFrame = $this->trace();
+        if (\preg_match('/eval\(/', $stackFrame['file'])) {
+            \preg_match_all('/([^\(]+)\((\d+)/', $stackFrame['file'], $matches);
+            $file = $matches[1][0];
+            $line = (int) $matches[2][0];
+        } else {
+            $file = $stackFrame['file'];
+            $line = $stackFrame['line'];
+        }
+
+        return \compact('file', 'line');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $info        = $this->fileInfo();
+        $num         = $input->getOption('num');
+        $factory     = new ConsoleColorFactory($this->colorMode);
+        $colors      = $factory->getConsoleColor();
+        $highlighter = new Highlighter($colors);
+        $contents    = \file_get_contents($info['file']);
+
+        $output->startPaging();
+        $output->writeln('');
+        $output->writeln(\sprintf('From <info>%s:%s</info>:', $this->replaceCwd($info['file']), $info['line']));
+        $output->writeln('');
+        $output->write($highlighter->getCodeSnippet($contents, $info['line'], $num, $num), ShellOutput::OUTPUT_RAW);
+        $output->stopPaging();
+    }
+
+    /**
+     * Replace the given directory from the start of a filepath.
+     *
+     * @param string $file
+     *
+     * @return string
+     */
+    private function replaceCwd($file)
+    {
+        $cwd = \getcwd();
+        if ($cwd === false) {
+            return $file;
+        }
+
+        $cwd = \rtrim($cwd, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
+
+        return \preg_replace('/^' . \preg_quote($cwd, '/') . '/', '', $file);
+    }
+}

vendor/psy/psysh/src/Command/WtfCommand.php

@@ -0,0 +1,125 @@
+<?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\Command;
+
+use Psy\Context;
+use Psy\ContextAware;
+use Psy\Input\FilterOptions;
+use Psy\Output\ShellOutput;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Show the last uncaught exception.
+ */
+class WtfCommand extends TraceCommand implements ContextAware
+{
+    /**
+     * Context instance (for ContextAware interface).
+     *
+     * @var Context
+     */
+    protected $context;
+
+    /**
+     * ContextAware interface.
+     *
+     * @param Context $context
+     */
+    public function setContext(Context $context)
+    {
+        $this->context = $context;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        list($grep, $insensitive, $invert) = FilterOptions::getOptions();
+
+        $this
+            ->setName('wtf')
+            ->setAliases(['last-exception', 'wtf?'])
+            ->setDefinition([
+                new InputArgument('incredulity', InputArgument::OPTIONAL | InputArgument::IS_ARRAY, 'Number of lines to show.'),
+                new InputOption('all', 'a',  InputOption::VALUE_NONE, 'Show entire backtrace.'),
+
+                $grep,
+                $insensitive,
+                $invert,
+            ])
+            ->setDescription('Show the backtrace of the most recent exception.')
+            ->setHelp(
+                <<<'HELP'
+Shows a few lines of the backtrace of the most recent exception.
+
+If you want to see more lines, add more question marks or exclamation marks:
+
+e.g.
+<return>>>> wtf ?</return>
+<return>>>> wtf ?!???!?!?</return>
+
+To see the entire backtrace, pass the -a/--all flag:
+
+e.g.
+<return>>>> wtf -a</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->filter->bind($input);
+
+        $incredulity = \implode('', $input->getArgument('incredulity'));
+        if (\strlen(\preg_replace('/[\\?!]/', '', $incredulity))) {
+            throw new \InvalidArgumentException('Incredulity must include only "?" and "!"');
+        }
+
+        $exception = $this->context->getLastException();
+        $count     = $input->getOption('all') ? PHP_INT_MAX : \max(3, \pow(2, \strlen($incredulity) + 1));
+
+        $shell = $this->getApplication();
+        $output->startPaging();
+        do {
+            $traceCount = \count($exception->getTrace());
+            $showLines  = $count;
+            // Show the whole trace if we'd only be hiding a few lines
+            if ($traceCount < \max($count * 1.2, $count + 2)) {
+                $showLines = PHP_INT_MAX;
+            }
+
+            $trace     = $this->getBacktrace($exception, $showLines);
+            $moreLines = $traceCount - \count($trace);
+
+            $output->writeln($shell->formatException($exception));
+            $output->writeln('--');
+            $output->write($trace, true, ShellOutput::NUMBER_LINES);
+            $output->writeln('');
+
+            if ($moreLines > 0) {
+                $output->writeln(\sprintf(
+                    '<aside>Use <return>wtf -a</return> to see %d more lines</aside>',
+                    $moreLines
+                ));
+                $output->writeln('');
+            }
+        } while ($exception = $exception->getPrevious());
+        $output->stopPaging();
+    }
+}

vendor/psy/psysh/src/ConfigPaths.php

@@ -0,0 +1,237 @@
+<?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;
+
+use XdgBaseDir\Xdg;
+
+/**
+ * A Psy Shell configuration path helper.
+ */
+class ConfigPaths
+{
+    /**
+     * Get potential config directory paths.
+     *
+     * Returns `~/.psysh`, `%APPDATA%/PsySH` (when on Windows), and all
+     * XDG Base Directory config directories:
+     *
+     *     http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+     *
+     * @return string[]
+     */
+    public static function getConfigDirs()
+    {
+        $xdg = new Xdg();
+
+        return self::getDirNames($xdg->getConfigDirs());
+    }
+
+    /**
+     * Get potential home config directory paths.
+     *
+     * Returns `~/.psysh`, `%APPDATA%/PsySH` (when on Windows), and the
+     * XDG Base Directory home config directory:
+     *
+     *     http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+     *
+     * @return string[]
+     */
+    public static function getHomeConfigDirs()
+    {
+        $xdg = new Xdg();
+
+        return self::getDirNames([$xdg->getHomeConfigDir()]);
+    }
+
+    /**
+     * Get the current home config directory.
+     *
+     * Returns the highest precedence home config directory which actually
+     * exists. If none of them exists, returns the highest precedence home
+     * config directory (`%APPDATA%/PsySH` on Windows, `~/.config/psysh`
+     * everywhere else).
+     *
+     * @see self::getHomeConfigDirs
+     *
+     * @return string
+     */
+    public static function getCurrentConfigDir()
+    {
+        $configDirs = self::getHomeConfigDirs();
+        foreach ($configDirs as $configDir) {
+            if (@\is_dir($configDir)) {
+                return $configDir;
+            }
+        }
+
+        return $configDirs[0];
+    }
+
+    /**
+     * Find real config files in config directories.
+     *
+     * @param string[] $names     Config file names
+     * @param string   $configDir Optionally use a specific config directory
+     *
+     * @return string[]
+     */
+    public static function getConfigFiles(array $names, $configDir = null)
+    {
+        $dirs = ($configDir === null) ? self::getConfigDirs() : [$configDir];
+
+        return self::getRealFiles($dirs, $names);
+    }
+
+    /**
+     * Get potential data directory paths.
+     *
+     * If a `dataDir` option was explicitly set, returns an array containing
+     * just that directory.
+     *
+     * Otherwise, it returns `~/.psysh` and all XDG Base Directory data directories:
+     *
+     *     http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+     *
+     * @return string[]
+     */
+    public static function getDataDirs()
+    {
+        $xdg = new Xdg();
+
+        return self::getDirNames($xdg->getDataDirs());
+    }
+
+    /**
+     * Find real data files in config directories.
+     *
+     * @param string[] $names   Config file names
+     * @param string   $dataDir Optionally use a specific config directory
+     *
+     * @return string[]
+     */
+    public static function getDataFiles(array $names, $dataDir = null)
+    {
+        $dirs = ($dataDir === null) ? self::getDataDirs() : [$dataDir];
+
+        return self::getRealFiles($dirs, $names);
+    }
+
+    /**
+     * Get a runtime directory.
+     *
+     * Defaults to  `/psysh` inside the system's temp dir.
+     *
+     * @return string
+     */
+    public static function getRuntimeDir()
+    {
+        $xdg = new Xdg();
+
+        \set_error_handler(['Psy\Exception\ErrorException', 'throwException']);
+
+        try {
+            // XDG doesn't really work on Windows, sometimes complains about
+            // permissions, sometimes tries to remove non-empty directories.
+            // It's a bit flaky. So we'll give this a shot first...
+            $runtimeDir = $xdg->getRuntimeDir(false);
+        } catch (\Exception $e) {
+            // Well. That didn't work. Fall back to a boring old folder in the
+            // system temp dir.
+            $runtimeDir = \sys_get_temp_dir();
+        }
+
+        \restore_error_handler();
+
+        return \strtr($runtimeDir, '\\', '/') . '/psysh';
+    }
+
+    private static function getDirNames(array $baseDirs)
+    {
+        $dirs = \array_map(function ($dir) {
+            return \strtr($dir, '\\', '/') . '/psysh';
+        }, $baseDirs);
+
+        // Add ~/.psysh
+        if ($home = \getenv('HOME')) {
+            $dirs[] = \strtr($home, '\\', '/') . '/.psysh';
+        }
+
+        // Add some Windows specific ones :)
+        if (\defined('PHP_WINDOWS_VERSION_MAJOR')) {
+            if ($appData = \getenv('APPDATA')) {
+                // AppData gets preference
+                \array_unshift($dirs, \strtr($appData, '\\', '/') . '/PsySH');
+            }
+
+            $dir = \strtr(\getenv('HOMEDRIVE') . '/' . \getenv('HOMEPATH'), '\\', '/') . '/.psysh';
+            if (!\in_array($dir, $dirs)) {
+                $dirs[] = $dir;
+            }
+        }
+
+        return $dirs;
+    }
+
+    private static function getRealFiles(array $dirNames, array $fileNames)
+    {
+        $files = [];
+        foreach ($dirNames as $dir) {
+            foreach ($fileNames as $name) {
+                $file = $dir . '/' . $name;
+                if (@\is_file($file)) {
+                    $files[] = $file;
+                }
+            }
+        }
+
+        return $files;
+    }
+
+    /**
+     * Ensure that $file exists and is writable, make the parent directory if necessary.
+     *
+     * Generates E_USER_NOTICE error if either $file or its directory is not writable.
+     *
+     * @param string $file
+     *
+     * @return string|false Full path to $file, or false if file is not writable
+     */
+    public static function touchFileWithMkdir($file)
+    {
+        if (\file_exists($file)) {
+            if (\is_writable($file)) {
+                return $file;
+            }
+
+            \trigger_error(\sprintf('Writing to %s is not allowed.', $file), E_USER_NOTICE);
+
+            return false;
+        }
+
+        $dir = \dirname($file);
+
+        if (!\is_dir($dir)) {
+            // Just try making it and see if it works
+            @\mkdir($dir, 0700, true);
+        }
+
+        if (!\is_dir($dir) || !\is_writable($dir)) {
+            \trigger_error(\sprintf('Writing to %s is not allowed.', $dir), E_USER_NOTICE);
+
+            return false;
+        }
+
+        \touch($file);
+
+        return $file;
+    }
+}

vendor/psy/psysh/src/ConsoleColorFactory.php

@@ -0,0 +1,82 @@
+<?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;
+
+use JakubOnderka\PhpConsoleColor\ConsoleColor;
+use JakubOnderka\PhpConsoleHighlighter\Highlighter;
+
+/**
+ * Builds `ConsoleColor` instances configured according to the given color mode.
+ */
+class ConsoleColorFactory
+{
+    private $colorMode;
+
+    /**
+     * @param string $colorMode
+     */
+    public function __construct($colorMode)
+    {
+        $this->colorMode = $colorMode;
+    }
+
+    /**
+     * Get a `ConsoleColor` instance configured according to the given color
+     * mode.
+     *
+     * @return ConsoleColor
+     */
+    public function getConsoleColor()
+    {
+        if ($this->colorMode === Configuration::COLOR_MODE_AUTO) {
+            return $this->getDefaultConsoleColor();
+        } elseif ($this->colorMode === Configuration::COLOR_MODE_FORCED) {
+            return $this->getForcedConsoleColor();
+        } elseif ($this->colorMode === Configuration::COLOR_MODE_DISABLED) {
+            return $this->getDisabledConsoleColor();
+        }
+    }
+
+    private function getDefaultConsoleColor()
+    {
+        $color = new ConsoleColor();
+        $color->addTheme(Highlighter::LINE_NUMBER, ['blue']);
+        $color->addTheme(Highlighter::TOKEN_KEYWORD, ['yellow']);
+        $color->addTheme(Highlighter::TOKEN_STRING, ['green']);
+        $color->addTheme(Highlighter::TOKEN_COMMENT, ['dark_gray']);
+
+        return $color;
+    }
+
+    private function getForcedConsoleColor()
+    {
+        $color = $this->getDefaultConsoleColor();
+        $color->setForceStyle(true);
+
+        return $color;
+    }
+
+    private function getDisabledConsoleColor()
+    {
+        $color = new ConsoleColor();
+
+        $color->addTheme(Highlighter::TOKEN_STRING, ['none']);
+        $color->addTheme(Highlighter::TOKEN_COMMENT, ['none']);
+        $color->addTheme(Highlighter::TOKEN_KEYWORD, ['none']);
+        $color->addTheme(Highlighter::TOKEN_DEFAULT, ['none']);
+        $color->addTheme(Highlighter::TOKEN_HTML, ['none']);
+        $color->addTheme(Highlighter::ACTUAL_LINE_MARK, ['none']);
+        $color->addTheme(Highlighter::LINE_NUMBER, ['none']);
+
+        return $color;
+    }
+}

vendor/psy/psysh/src/Context.php

@@ -0,0 +1,320 @@
+<?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;
+    private $boundClass;
+
+    /**
+     * 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.
+     *
+     * Note that this unsets the bound class, if any exists.
+     *
+     * @param object|null $boundObject
+     */
+    public function setBoundObject($boundObject)
+    {
+        $this->boundObject = \is_object($boundObject) ? $boundObject : null;
+        $this->boundClass = null;
+    }
+
+    /**
+     * Get the bound object ($this variable) for the interactive shell.
+     *
+     * @return object|null
+     */
+    public function getBoundObject()
+    {
+        return $this->boundObject;
+    }
+
+    /**
+     * Set the bound class (self) for the interactive shell.
+     *
+     * Note that this unsets the bound object, if any exists.
+     *
+     * @param string|null $boundClass
+     */
+    public function setBoundClass($boundClass)
+    {
+        $this->boundClass = (\is_string($boundClass) && $boundClass !== '') ? $boundClass : null;
+        $this->boundObject = null;
+    }
+
+    /**
+     * Get the bound class (self) for the interactive shell.
+     *
+     * @return string|null
+     */
+    public function getBoundClass()
+    {
+        return $this->boundClass;
+    }
+
+    /**
+     * 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);
+    }
+}

vendor/psy/psysh/src/ContextAware.php

@@ -0,0 +1,28 @@
+<?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;
+
+/**
+ * ContextAware interface.
+ *
+ * This interface is used to pass the Shell's context into commands and such
+ * which require access to the current scope variables.
+ */
+interface ContextAware
+{
+    /**
+     * Set the Context reference.
+     *
+     * @param Context $context
+     */
+    public function setContext(Context $context);
+}

vendor/psy/psysh/src/Exception/BreakException.php

@@ -0,0 +1,51 @@
+<?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\Exception;
+
+/**
+ * A break exception, used for halting the Psy Shell.
+ */
+class BreakException extends \Exception implements Exception
+{
+    private $rawMessage;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($message = '', $code = 0, \Exception $previous = null)
+    {
+        $this->rawMessage = $message;
+        parent::__construct(\sprintf('Exit:  %s', $message), $code, $previous);
+    }
+
+    /**
+     * Return a raw (unformatted) version of the error message.
+     *
+     * @return string
+     */
+    public function getRawMessage()
+    {
+        return $this->rawMessage;
+    }
+
+    /**
+     * Throws BreakException.
+     *
+     * Since `throw` can not be inserted into arbitrary expressions, it wraps with function call.
+     *
+     * @throws BreakException
+     */
+    public static function exitShell()
+    {
+        throw new self('Goodbye');
+    }
+}

vendor/psy/psysh/src/Exception/DeprecatedException.php

@@ -0,0 +1,20 @@
+<?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\Exception;
+
+/**
+ * A DeprecatedException for Psy.
+ */
+class DeprecatedException extends RuntimeException
+{
+    // This space intentionally left blank.
+}

vendor/psy/psysh/src/Exception/ErrorException.php

@@ -0,0 +1,114 @@
+<?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\Exception;
+
+/**
+ * A custom error Exception for Psy with a formatted $message.
+ */
+class ErrorException extends \ErrorException implements Exception
+{
+    private $rawMessage;
+
+    /**
+     * Construct a Psy ErrorException.
+     *
+     * @param string    $message  (default: "")
+     * @param int       $code     (default: 0)
+     * @param int       $severity (default: 1)
+     * @param string    $filename (default: null)
+     * @param int       $lineno   (default: null)
+     * @param Exception $previous (default: null)
+     */
+    public function __construct($message = '', $code = 0, $severity = 1, $filename = null, $lineno = null, $previous = null)
+    {
+        $this->rawMessage = $message;
+
+        if (!empty($filename) && \preg_match('{Psy[/\\\\]ExecutionLoop}', $filename)) {
+            $filename = '';
+        }
+
+        switch ($severity) {
+            case E_STRICT:
+                $type = 'Strict error';
+                break;
+
+            case E_NOTICE:
+            case E_USER_NOTICE:
+                $type = 'Notice';
+                break;
+
+            case E_WARNING:
+            case E_CORE_WARNING:
+            case E_COMPILE_WARNING:
+            case E_USER_WARNING:
+                $type = 'Warning';
+                break;
+
+            case E_DEPRECATED:
+            case E_USER_DEPRECATED:
+                $type = 'Deprecated';
+                break;
+
+            case E_RECOVERABLE_ERROR:
+                $type = 'Recoverable fatal error';
+                break;
+
+            default:
+                $type = 'Error';
+                break;
+        }
+
+        $message = \sprintf('PHP %s:  %s%s on line %d', $type, $message, $filename ? ' in ' . $filename : '', $lineno);
+        parent::__construct($message, $code, $severity, $filename, $lineno, $previous);
+    }
+
+    /**
+     * Get the raw (unformatted) message for this error.
+     *
+     * @return string
+     */
+    public function getRawMessage()
+    {
+        return $this->rawMessage;
+    }
+
+    /**
+     * Helper for throwing an ErrorException.
+     *
+     * This allows us to:
+     *
+     *     set_error_handler(array('Psy\Exception\ErrorException', 'throwException'));
+     *
+     * @throws ErrorException
+     *
+     * @param int    $errno   Error type
+     * @param string $errstr  Message
+     * @param string $errfile Filename
+     * @param int    $errline Line number
+     */
+    public static function throwException($errno, $errstr, $errfile, $errline)
+    {
+        throw new self($errstr, 0, $errno, $errfile, $errline);
+    }
+
+    /**
+     * Create an ErrorException from an Error.
+     *
+     * @param \Error $e
+     *
+     * @return ErrorException
+     */
+    public static function fromError(\Error $e)
+    {
+        return new self($e->getMessage(), $e->getCode(), 1, $e->getFile(), $e->getLine(), $e);
+    }
+}

vendor/psy/psysh/src/Exception/Exception.php

@@ -0,0 +1,27 @@
+<?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\Exception;
+
+/**
+ * An interface for Psy Exceptions.
+ */
+interface Exception
+{
+    /**
+     * This is the only thing, really...
+     *
+     * Return a raw (unformatted) version of the message.
+     *
+     * @return string
+     */
+    public function getRawMessage();
+}

vendor/psy/psysh/src/Exception/FatalErrorException.php

@@ -0,0 +1,52 @@
+<?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\Exception;
+
+/**
+ * A "fatal error" Exception for Psy.
+ */
+class FatalErrorException extends \ErrorException implements Exception
+{
+    private $rawMessage;
+
+    /**
+     * Create a fatal error.
+     *
+     * @param string     $message  (default: "")
+     * @param int        $code     (default: 0)
+     * @param int        $severity (default: 1)
+     * @param string     $filename (default: null)
+     * @param int        $lineno   (default: null)
+     * @param \Exception $previous (default: null)
+     */
+    public function __construct($message = '', $code = 0, $severity = 1, $filename = null, $lineno = null, $previous = null)
+    {
+        // Since these are basically always PHP Parser Node line numbers, treat -1 as null.
+        if ($lineno === -1) {
+            $lineno = null;
+        }
+
+        $this->rawMessage = $message;
+        $message = \sprintf('PHP Fatal error:  %s in %s on line %d', $message, $filename ?: "eval()'d code", $lineno);
+        parent::__construct($message, $code, $severity, $filename, $lineno, $previous);
+    }
+
+    /**
+     * Return a raw (unformatted) version of the error message.
+     *
+     * @return string
+     */
+    public function getRawMessage()
+    {
+        return $this->rawMessage;
+    }
+}

vendor/psy/psysh/src/Exception/ParseErrorException.php

@@ -0,0 +1,42 @@
+<?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\Exception;
+
+/**
+ * A "parse error" Exception for Psy.
+ */
+class ParseErrorException extends \PhpParser\Error implements Exception
+{
+    /**
+     * Constructor!
+     *
+     * @param string $message (default: "")
+     * @param int    $line    (default: -1)
+     */
+    public function __construct($message = '', $line = -1)
+    {
+        $message = \sprintf('PHP Parse error: %s', $message);
+        parent::__construct($message, $line);
+    }
+
+    /**
+     * Create a ParseErrorException from a PhpParser Error.
+     *
+     * @param \PhpParser\Error $e
+     *
+     * @return ParseErrorException
+     */
+    public static function fromParseError(\PhpParser\Error $e)
+    {
+        return new self($e->getRawMessage(), $e->getStartLine());
+    }
+}

vendor/psy/psysh/src/Exception/RuntimeException.php

@@ -0,0 +1,43 @@
+<?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\Exception;
+
+/**
+ * A RuntimeException for Psy.
+ */
+class RuntimeException extends \RuntimeException implements Exception
+{
+    private $rawMessage;
+
+    /**
+     * Make this bad boy.
+     *
+     * @param string     $message  (default: "")
+     * @param int        $code     (default: 0)
+     * @param \Exception $previous (default: null)
+     */
+    public function __construct($message = '', $code = 0, \Exception $previous = null)
+    {
+        $this->rawMessage = $message;
+        parent::__construct($message, $code, $previous);
+    }
+
+    /**
+     * Return a raw (unformatted) version of the error message.
+     *
+     * @return string
+     */
+    public function getRawMessage()
+    {
+        return $this->rawMessage;
+    }
+}

vendor/psy/psysh/src/Exception/ThrowUpException.php

@@ -0,0 +1,57 @@
+<?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\Exception;
+
+/**
+ * A throw-up exception, used for throwing an exception out of the Psy Shell.
+ */
+class ThrowUpException extends \Exception implements Exception
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct(\Exception $exception)
+    {
+        $message = \sprintf("Throwing %s with message '%s'", \get_class($exception), $exception->getMessage());
+        parent::__construct($message, $exception->getCode(), $exception);
+    }
+
+    /**
+     * Return a raw (unformatted) version of the error message.
+     *
+     * @return string
+     */
+    public function getRawMessage()
+    {
+        return $this->getPrevious()->getMessage();
+    }
+
+    /**
+     * Create a ThrowUpException from a Throwable.
+     *
+     * @param \Throwable $throwable
+     *
+     * @return ThrowUpException
+     */
+    public static function fromThrowable($throwable)
+    {
+        if ($throwable instanceof \Error) {
+            $throwable = ErrorException::fromError($throwable);
+        }
+
+        if (!$throwable instanceof \Exception) {
+            throw new \InvalidArgumentException('throw-up can only throw Exceptions and Errors');
+        }
+
+        return new self($throwable);
+    }
+}

vendor/psy/psysh/src/Exception/TypeErrorException.php

@@ -0,0 +1,55 @@
+<?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\Exception;
+
+/**
+ * A "type error" Exception for Psy.
+ */
+class TypeErrorException extends \Exception implements Exception
+{
+    private $rawMessage;
+
+    /**
+     * Constructor!
+     *
+     * @param string $message (default: "")
+     * @param int    $code    (default: 0)
+     */
+    public function __construct($message = '', $code = 0)
+    {
+        $this->rawMessage = $message;
+        $message = \preg_replace('/, called in .*?: eval\\(\\)\'d code/', '', $message);
+        parent::__construct(\sprintf('TypeError: %s', $message), $code);
+    }
+
+    /**
+     * Get the raw (unformatted) message for this error.
+     *
+     * @return string
+     */
+    public function getRawMessage()
+    {
+        return $this->rawMessage;
+    }
+
+    /**
+     * Create a TypeErrorException from a TypeError.
+     *
+     * @param \TypeError $e
+     *
+     * @return TypeErrorException
+     */
+    public static function fromTypeError(\TypeError $e)
+    {
+        return new self($e->getMessage(), $e->getCode());
+    }
+}

vendor/psy/psysh/src/ExecutionClosure.php

@@ -0,0 +1,119 @@
+<?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 Psy Shell's execution scope.
+ */
+class ExecutionClosure
+{
+    const NOOP_INPUT = 'return null;';
+
+    private $closure;
+
+    /**
+     * @param Shell $__psysh__
+     */
+    public function __construct(Shell $__psysh__)
+    {
+        $this->setClosure($__psysh__, function () use ($__psysh__) {
+            try {
+                // Restore execution scope variables
+                \extract($__psysh__->getScopeVariables(false));
+
+                // Buffer stdout; we'll need it later
+                \ob_start([$__psysh__, 'writeStdout'], 1);
+
+                // Convert all errors to exceptions
+                \set_error_handler([$__psysh__, 'handleError']);
+
+                // Evaluate the current code buffer
+                $_ = eval($__psysh__->onExecute($__psysh__->flushCode() ?: ExecutionClosure::NOOP_INPUT));
+            } catch (\Throwable $_e) {
+                // Clean up on our way out.
+                \restore_error_handler();
+                if (\ob_get_level() > 0) {
+                    \ob_end_clean();
+                }
+
+                throw $_e;
+            } catch (\Exception $_e) {
+                // Clean up on our way out.
+                \restore_error_handler();
+                if (\ob_get_level() > 0) {
+                    \ob_end_clean();
+                }
+
+                throw $_e;
+            }
+
+            // Won't be needing this anymore
+            \restore_error_handler();
+
+            // Flush stdout (write to shell output, plus save to magic variable)
+            \ob_end_flush();
+
+            // Save execution scope variables for next time
+            $__psysh__->setScopeVariables(\get_defined_vars());
+
+            return $_;
+        });
+    }
+
+    /**
+     * Set the closure instance.
+     *
+     * @param Shell    $psysh
+     * @param \Closure $closure
+     */
+    protected function setClosure(Shell $shell, \Closure $closure)
+    {
+        if (self::shouldBindClosure()) {
+            $that = $shell->getBoundObject();
+            if (\is_object($that)) {
+                $closure = $closure->bindTo($that, \get_class($that));
+            } else {
+                $closure = $closure->bindTo(null, $shell->getBoundClass());
+            }
+        }
+
+        $this->closure = $closure;
+    }
+
+    /**
+     * Go go gadget closure.
+     *
+     * @return mixed
+     */
+    public function execute()
+    {
+        $closure = $this->closure;
+
+        return $closure();
+    }
+
+    /**
+     * Decide whether to bind the execution closure.
+     *
+     * @return bool
+     */
+    protected static function shouldBindClosure()
+    {
+        // skip binding on HHVM < 3.5.0
+        // see https://github.com/facebook/hhvm/issues/1203
+        if (\defined('HHVM_VERSION')) {
+            return \version_compare(HHVM_VERSION, '3.5.0', '>=');
+        }
+
+        return true;
+    }
+}

vendor/psy/psysh/src/ExecutionLoop.php

@@ -0,0 +1,67 @@
+<?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;
+
+use Psy\Exception\ErrorException;
+
+/**
+ * The Psy Shell execution loop.
+ */
+class ExecutionLoop
+{
+    /**
+     * Run the execution loop.
+     *
+     * @throws ThrowUpException if thrown by the `throw-up` command
+     *
+     * @param Shell $shell
+     */
+    public function run(Shell $shell)
+    {
+        $this->loadIncludes($shell);
+
+        $closure = new ExecutionLoopClosure($shell);
+        $closure->execute();
+    }
+
+    /**
+     * Load user-defined includes.
+     *
+     * @param Shell $shell
+     */
+    protected function loadIncludes(Shell $shell)
+    {
+        // Load user-defined includes
+        $load = function (Shell $__psysh__) {
+            \set_error_handler([$__psysh__, 'handleError']);
+            foreach ($__psysh__->getIncludes() as $__psysh_include__) {
+                try {
+                    include $__psysh_include__;
+                } catch (\Error $_e) {
+                    $__psysh__->writeException(ErrorException::fromError($_e));
+                } catch (\Exception $_e) {
+                    $__psysh__->writeException($_e);
+                }
+            }
+            \restore_error_handler();
+            unset($__psysh_include__);
+
+            // Override any new local variables with pre-defined scope variables
+            \extract($__psysh__->getScopeVariables(false));
+
+            // ... then add the whole mess of variables back.
+            $__psysh__->setScopeVariables(\get_defined_vars());
+        };
+
+        $load($shell);
+    }
+}

vendor/psy/psysh/src/ExecutionLoop/AbstractListener.php

@@ -0,0 +1,62 @@
+<?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\ExecutionLoop;
+
+use Psy\Shell;
+
+/**
+ * Abstract Execution Loop Listener class.
+ */
+abstract class AbstractListener implements Listener
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function beforeRun(Shell $shell)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function beforeLoop(Shell $shell)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function onInput(Shell $shell, $input)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function onExecute(Shell $shell, $code)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function afterLoop(Shell $shell)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function afterRun(Shell $shell)
+    {
+    }
+}

vendor/psy/psysh/src/ExecutionLoop/Listener.php

@@ -0,0 +1,83 @@
+<?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\ExecutionLoop;
+
+use Psy\Shell;
+
+/**
+ * Execution Loop Listener interface.
+ */
+interface Listener
+{
+    /**
+     * Determines whether this listener should be active.
+     *
+     * @return bool
+     */
+    public static function isSupported();
+
+    /**
+     * Called once before the REPL session starts.
+     *
+     * @param Shell $shell
+     */
+    public function beforeRun(Shell $shell);
+
+    /**
+     * Called at the start of each loop.
+     *
+     * @param Shell $shell
+     */
+    public function beforeLoop(Shell $shell);
+
+    /**
+     * Called on user input.
+     *
+     * Return a new string to override or rewrite user input.
+     *
+     * @param Shell  $shell
+     * @param string $input
+     *
+     * @return string|null User input override
+     */
+    public function onInput(Shell $shell, $input);
+
+    /**
+     * Called before executing user code.
+     *
+     * Return a new string to override or rewrite user code.
+     *
+     * Note that this is run *after* the Code Cleaner, so if you return invalid
+     * or unsafe PHP here, it'll be executed without any of the safety Code
+     * Cleaner provides. This comes with the big kid warranty :)
+     *
+     * @param Shell  $shell
+     * @param string $code
+     *
+     * @return string|null User code override
+     */
+    public function onExecute(Shell $shell, $code);
+
+    /**
+     * Called at the end of each loop.
+     *
+     * @param Shell $shell
+     */
+    public function afterLoop(Shell $shell);
+
+    /**
+     * Called once after the REPL session ends.
+     *
+     * @param Shell $shell
+     */
+    public function afterRun(Shell $shell);
+}

vendor/psy/psysh/src/ExecutionLoop/ProcessForker.php

@@ -0,0 +1,219 @@
+<?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\ExecutionLoop;
+
+use Psy\Context;
+use Psy\Exception\BreakException;
+use Psy\Shell;
+
+/**
+ * An execution loop listener that forks the process before executing code.
+ *
+ * This is awesome, as the session won't die prematurely if user input includes
+ * a fatal error, such as redeclaring a class or function.
+ */
+class ProcessForker extends AbstractListener
+{
+    private $savegame;
+    private $up;
+
+    /**
+     * Process forker is supported if pcntl and posix extensions are available.
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return \function_exists('pcntl_signal') && \function_exists('posix_getpid');
+    }
+
+    /**
+     * Forks into a master and a loop process.
+     *
+     * The loop process will handle the evaluation of all instructions, then
+     * return its state via a socket upon completion.
+     *
+     * @param Shell $shell
+     */
+    public function beforeRun(Shell $shell)
+    {
+        list($up, $down) = \stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
+
+        if (!$up) {
+            throw new \RuntimeException('Unable to create socket pair');
+        }
+
+        $pid = \pcntl_fork();
+        if ($pid < 0) {
+            throw new \RuntimeException('Unable to start execution loop');
+        } elseif ($pid > 0) {
+            // This is the main thread. We'll just wait for a while.
+
+            // We won't be needing this one.
+            \fclose($up);
+
+            // Wait for a return value from the loop process.
+            $read   = [$down];
+            $write  = null;
+            $except = null;
+
+            do {
+                $n = @\stream_select($read, $write, $except, null);
+
+                if ($n === 0) {
+                    throw new \RuntimeException('Process timed out waiting for execution loop');
+                }
+
+                if ($n === false) {
+                    $err = \error_get_last();
+                    if (!isset($err['message']) || \stripos($err['message'], 'interrupted system call') === false) {
+                        $msg = $err['message'] ?
+                            \sprintf('Error waiting for execution loop: %s', $err['message']) :
+                            'Error waiting for execution loop';
+                        throw new \RuntimeException($msg);
+                    }
+                }
+            } while ($n < 1);
+
+            $content = \stream_get_contents($down);
+            \fclose($down);
+
+            if ($content) {
+                $shell->setScopeVariables(@\unserialize($content));
+            }
+
+            throw new BreakException('Exiting main thread');
+        }
+
+        // This is the child process. It's going to do all the work.
+        if (\function_exists('setproctitle')) {
+            setproctitle('psysh (loop)');
+        }
+
+        // We won't be needing this one.
+        \fclose($down);
+
+        // Save this; we'll need to close it in `afterRun`
+        $this->up = $up;
+    }
+
+    /**
+     * Create a savegame at the start of each loop iteration.
+     *
+     * @param Shell $shell
+     */
+    public function beforeLoop(Shell $shell)
+    {
+        $this->createSavegame();
+    }
+
+    /**
+     * Clean up old savegames at the end of each loop iteration.
+     *
+     * @param Shell $shell
+     */
+    public function afterLoop(Shell $shell)
+    {
+        // if there's an old savegame hanging around, let's kill it.
+        if (isset($this->savegame)) {
+            \posix_kill($this->savegame, SIGKILL);
+            \pcntl_signal_dispatch();
+        }
+    }
+
+    /**
+     * After the REPL session ends, send the scope variables back up to the main
+     * thread (if this is a child thread).
+     *
+     * @param Shell $shell
+     */
+    public function afterRun(Shell $shell)
+    {
+        // We're a child thread. Send the scope variables back up to the main thread.
+        if (isset($this->up)) {
+            \fwrite($this->up, $this->serializeReturn($shell->getScopeVariables(false)));
+            \fclose($this->up);
+
+            \posix_kill(\posix_getpid(), SIGKILL);
+        }
+    }
+
+    /**
+     * Create a savegame fork.
+     *
+     * The savegame contains the current execution state, and can be resumed in
+     * the event that the worker dies unexpectedly (for example, by encountering
+     * a PHP fatal error).
+     */
+    private function createSavegame()
+    {
+        // the current process will become the savegame
+        $this->savegame = \posix_getpid();
+
+        $pid = \pcntl_fork();
+        if ($pid < 0) {
+            throw new \RuntimeException('Unable to create savegame fork');
+        } elseif ($pid > 0) {
+            // we're the savegame now... let's wait and see what happens
+            \pcntl_waitpid($pid, $status);
+
+            // worker exited cleanly, let's bail
+            if (!\pcntl_wexitstatus($status)) {
+                \posix_kill(\posix_getpid(), SIGKILL);
+            }
+
+            // worker didn't exit cleanly, we'll need to have another go
+            $this->createSavegame();
+        }
+    }
+
+    /**
+     * Serialize all serializable return values.
+     *
+     * A naïve serialization will run into issues if there is a Closure or
+     * SimpleXMLElement (among other things) in scope when exiting the execution
+     * loop. We'll just ignore these unserializable classes, and serialize what
+     * we can.
+     *
+     * @param array $return
+     *
+     * @return string
+     */
+    private function serializeReturn(array $return)
+    {
+        $serializable = [];
+
+        foreach ($return as $key => $value) {
+            // No need to return magic variables
+            if (Context::isSpecialVariableName($key)) {
+                continue;
+            }
+
+            // Resources and Closures don't error, but they don't serialize well either.
+            if (\is_resource($value) || $value instanceof \Closure) {
+                continue;
+            }
+
+            try {
+                @\serialize($value);
+                $serializable[$key] = $value;
+            } catch (\Throwable $e) {
+                // we'll just ignore this one...
+            } catch (\Exception $e) {
+                // and this one too...
+                // @todo remove this once we don't support PHP 5.x anymore :)
+            }
+        }
+
+        return @\serialize($serializable);
+    }
+}

vendor/psy/psysh/src/ExecutionLoop/RunkitReloader.php

@@ -0,0 +1,135 @@
+<?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\ExecutionLoop;
+
+use Psy\Exception\ParseErrorException;
+use Psy\ParserFactory;
+use Psy\Shell;
+
+/**
+ * A runkit-based code reloader, which is pretty much magic.
+ */
+class RunkitReloader extends AbstractListener
+{
+    private $parser;
+    private $timestamps = [];
+
+    /**
+     * Only enabled if Runkit is installed.
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return \extension_loaded('runkit');
+    }
+
+    /**
+     * Construct a Runkit Reloader.
+     *
+     * @todo Pass in Parser Factory instance for dependency injection?
+     */
+    public function __construct()
+    {
+        $parserFactory = new ParserFactory();
+        $this->parser = $parserFactory->createParser();
+    }
+
+    /**
+     * Reload code on input.
+     *
+     * @param Shell  $shell
+     * @param string $input
+     */
+    public function onInput(Shell $shell, $input)
+    {
+        $this->reload($shell);
+    }
+
+    /**
+     * Look through included files and update anything with a new timestamp.
+     *
+     * @param Shell $shell
+     */
+    private function reload(Shell $shell)
+    {
+        \clearstatcache();
+        $modified = [];
+
+        foreach (\get_included_files() as $file) {
+            $timestamp = \filemtime($file);
+
+            if (!isset($this->timestamps[$file])) {
+                $this->timestamps[$file] = $timestamp;
+                continue;
+            }
+
+            if ($this->timestamps[$file] === $timestamp) {
+                continue;
+            }
+
+            if (!$this->lintFile($file)) {
+                $msg = \sprintf('Modified file "%s" could not be reloaded', $file);
+                $shell->writeException(new ParseErrorException($msg));
+                continue;
+            }
+
+            $modified[] = $file;
+            $this->timestamps[$file] = $timestamp;
+        }
+
+        // switch (count($modified)) {
+        //     case 0:
+        //         return;
+
+        //     case 1:
+        //         printf("Reloading modified file: \"%s\"\n", str_replace(getcwd(), '.', $file));
+        //         break;
+
+        //     default:
+        //         printf("Reloading %d modified files\n", count($modified));
+        //         break;
+        // }
+
+        foreach ($modified as $file) {
+            runkit_import($file, (
+                RUNKIT_IMPORT_FUNCTIONS |
+                RUNKIT_IMPORT_CLASSES |
+                RUNKIT_IMPORT_CLASS_METHODS |
+                RUNKIT_IMPORT_CLASS_CONSTS |
+                RUNKIT_IMPORT_CLASS_PROPS |
+                RUNKIT_IMPORT_OVERRIDE
+            ));
+        }
+    }
+
+    /**
+     * Should this file be re-imported?
+     *
+     * Use PHP-Parser to ensure that the file is valid PHP.
+     *
+     * @param string $file
+     *
+     * @return bool
+     */
+    private function lintFile($file)
+    {
+        // first try to parse it
+        try {
+            $this->parser->parse(\file_get_contents($file));
+        } catch (\Exception $e) {
+            return false;
+        }
+
+        return true;
+    }
+}

vendor/psy/psysh/src/ExecutionLoopClosure.php

@@ -0,0 +1,104 @@
+<?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;
+
+use Psy\Exception\BreakException;
+use Psy\Exception\ErrorException;
+use Psy\Exception\ThrowUpException;
+use Psy\Exception\TypeErrorException;
+
+/**
+ * The Psy Shell's execution loop scope.
+ *
+ * @todo Once we're on PHP 5.5, we can switch ExecutionClosure to a generator
+ * and get rid of the duplicate closure implementations :)
+ */
+class ExecutionLoopClosure extends ExecutionClosure
+{
+    /**
+     * @param Shell $__psysh__
+     */
+    public function __construct(Shell $__psysh__)
+    {
+        $this->setClosure($__psysh__, function () use ($__psysh__) {
+            // Restore execution scope variables
+            \extract($__psysh__->getScopeVariables(false));
+
+            do {
+                $__psysh__->beforeLoop();
+
+                try {
+                    $__psysh__->getInput();
+
+                    try {
+                        // Pull in any new execution scope variables
+                        if ($__psysh__->getLastExecSuccess()) {
+                            \extract($__psysh__->getScopeVariablesDiff(\get_defined_vars()));
+                        }
+
+                        // Buffer stdout; we'll need it later
+                        \ob_start([$__psysh__, 'writeStdout'], 1);
+
+                        // Convert all errors to exceptions
+                        \set_error_handler([$__psysh__, 'handleError']);
+
+                        // Evaluate the current code buffer
+                        $_ = eval($__psysh__->onExecute($__psysh__->flushCode() ?: ExecutionClosure::NOOP_INPUT));
+                    } catch (\Throwable $_e) {
+                        // Clean up on our way out.
+                        \restore_error_handler();
+                        if (\ob_get_level() > 0) {
+                            \ob_end_clean();
+                        }
+
+                        throw $_e;
+                    } catch (\Exception $_e) {
+                        // Clean up on our way out.
+                        \restore_error_handler();
+                        if (\ob_get_level() > 0) {
+                            \ob_end_clean();
+                        }
+
+                        throw $_e;
+                    }
+
+                    // Won't be needing this anymore
+                    \restore_error_handler();
+
+                    // Flush stdout (write to shell output, plus save to magic variable)
+                    \ob_end_flush();
+
+                    // Save execution scope variables for next time
+                    $__psysh__->setScopeVariables(\get_defined_vars());
+
+                    $__psysh__->writeReturnValue($_);
+                } catch (BreakException $_e) {
+                    $__psysh__->writeException($_e);
+
+                    return;
+                } catch (ThrowUpException $_e) {
+                    $__psysh__->writeException($_e);
+
+                    throw $_e;
+                } catch (\TypeError $_e) {
+                    $__psysh__->writeException(TypeErrorException::fromTypeError($_e));
+                } catch (\Error $_e) {
+                    $__psysh__->writeException(ErrorException::fromError($_e));
+                } catch (\Exception $_e) {
+                    $__psysh__->writeException($_e);
+                }
+
+                $__psysh__->afterLoop();
+            } while (true);
+        });
+    }
+}

vendor/psy/psysh/src/Formatter/CodeFormatter.php

@@ -0,0 +1,71 @@
+<?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\Formatter;
+
+use JakubOnderka\PhpConsoleHighlighter\Highlighter;
+use Psy\Configuration;
+use Psy\ConsoleColorFactory;
+use Psy\Exception\RuntimeException;
+
+/**
+ * A pretty-printer for code.
+ */
+class CodeFormatter implements Formatter
+{
+    /**
+     * Format the code represented by $reflector.
+     *
+     * @param \Reflector  $reflector
+     * @param null|string $colorMode (default: null)
+     *
+     * @return string formatted code
+     */
+    public static function format(\Reflector $reflector, $colorMode = null)
+    {
+        if (!self::isReflectable($reflector)) {
+            throw new RuntimeException('Source code unavailable');
+        }
+
+        $colorMode = $colorMode ?: Configuration::COLOR_MODE_AUTO;
+
+        if ($fileName = $reflector->getFileName()) {
+            if (!\is_file($fileName)) {
+                throw new RuntimeException('Source code unavailable');
+            }
+
+            $file  = \file_get_contents($fileName);
+            $start = $reflector->getStartLine();
+            $end   = $reflector->getEndLine() - $start;
+
+            $factory     = new ConsoleColorFactory($colorMode);
+            $colors      = $factory->getConsoleColor();
+            $highlighter = new Highlighter($colors);
+
+            return $highlighter->getCodeSnippet($file, $start, 0, $end);
+        } else {
+            throw new RuntimeException('Source code unavailable');
+        }
+    }
+
+    /**
+     * Check whether a Reflector instance is reflectable by this formatter.
+     *
+     * @param \Reflector $reflector
+     *
+     * @return bool
+     */
+    private static function isReflectable(\Reflector $reflector)
+    {
+        return $reflector instanceof \ReflectionClass ||
+            $reflector instanceof \ReflectionFunctionAbstract;
+    }
+}

vendor/psy/psysh/src/Formatter/DocblockFormatter.php

@@ -0,0 +1,168 @@
+<?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\Formatter;
+
+use Psy\Util\Docblock;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+
+/**
+ * A pretty-printer for docblocks.
+ */
+class DocblockFormatter implements Formatter
+{
+    private static $vectorParamTemplates = [
+        'type' => 'info',
+        'var'  => 'strong',
+    ];
+
+    /**
+     * Format a docblock.
+     *
+     * @param \Reflector $reflector
+     *
+     * @return string Formatted docblock
+     */
+    public static function format(\Reflector $reflector)
+    {
+        $docblock = new Docblock($reflector);
+        $chunks   = [];
+
+        if (!empty($docblock->desc)) {
+            $chunks[] = '<comment>Description:</comment>';
+            $chunks[] = self::indent(OutputFormatter::escape($docblock->desc), '  ');
+            $chunks[] = '';
+        }
+
+        if (!empty($docblock->tags)) {
+            foreach ($docblock::$vectors as $name => $vector) {
+                if (isset($docblock->tags[$name])) {
+                    $chunks[] = \sprintf('<comment>%s:</comment>', self::inflect($name));
+                    $chunks[] = self::formatVector($vector, $docblock->tags[$name]);
+                    $chunks[] = '';
+                }
+            }
+
+            $tags = self::formatTags(\array_keys($docblock::$vectors), $docblock->tags);
+            if (!empty($tags)) {
+                $chunks[] = $tags;
+                $chunks[] = '';
+            }
+        }
+
+        return \rtrim(\implode("\n", $chunks));
+    }
+
+    /**
+     * Format a docblock vector, for example, `@throws`, `@param`, or `@return`.
+     *
+     * @see DocBlock::$vectors
+     *
+     * @param array $vector
+     * @param array $lines
+     *
+     * @return string
+     */
+    private static function formatVector(array $vector, array $lines)
+    {
+        $template = [' '];
+        foreach ($vector as $type) {
+            $max = 0;
+            foreach ($lines as $line) {
+                $chunk = $line[$type];
+                $cur = empty($chunk) ? 0 : \strlen($chunk) + 1;
+                if ($cur > $max) {
+                    $max = $cur;
+                }
+            }
+
+            $template[] = self::getVectorParamTemplate($type, $max);
+        }
+        $template = \implode(' ', $template);
+
+        return \implode("\n", \array_map(function ($line) use ($template) {
+            $escaped = \array_map(['Symfony\Component\Console\Formatter\OutputFormatter', 'escape'], $line);
+
+            return \rtrim(\vsprintf($template, $escaped));
+        }, $lines));
+    }
+
+    /**
+     * Format docblock tags.
+     *
+     * @param array $skip Tags to exclude
+     * @param array $tags Tags to format
+     *
+     * @return string formatted tags
+     */
+    private static function formatTags(array $skip, array $tags)
+    {
+        $chunks = [];
+
+        foreach ($tags as $name => $values) {
+            if (\in_array($name, $skip)) {
+                continue;
+            }
+
+            foreach ($values as $value) {
+                $chunks[] = \sprintf('<comment>%s%s</comment> %s', self::inflect($name), empty($value) ? '' : ':', OutputFormatter::escape($value));
+            }
+
+            $chunks[] = '';
+        }
+
+        return \implode("\n", $chunks);
+    }
+
+    /**
+     * Get a docblock vector template.
+     *
+     * @param string $type Vector type
+     * @param int    $max  Pad width
+     *
+     * @return string
+     */
+    private static function getVectorParamTemplate($type, $max)
+    {
+        if (!isset(self::$vectorParamTemplates[$type])) {
+            return \sprintf('%%-%ds', $max);
+        }
+
+        return \sprintf('<%s>%%-%ds</%s>', self::$vectorParamTemplates[$type], $max, self::$vectorParamTemplates[$type]);
+    }
+
+    /**
+     * Indent a string.
+     *
+     * @param string $text   String to indent
+     * @param string $indent (default: '  ')
+     *
+     * @return string
+     */
+    private static function indent($text, $indent = '  ')
+    {
+        return $indent . \str_replace("\n", "\n" . $indent, $text);
+    }
+
+    /**
+     * Convert underscored or whitespace separated words into sentence case.
+     *
+     * @param string $text
+     *
+     * @return string
+     */
+    private static function inflect($text)
+    {
+        $words = \trim(\preg_replace('/[\s_-]+/', ' ', \preg_replace('/([a-z])([A-Z])/', '$1 $2', $text)));
+
+        return \implode(' ', \array_map('ucfirst', \explode(' ', $words)));
+    }
+}

vendor/psy/psysh/src/Formatter/Formatter.php

@@ -0,0 +1,25 @@
+<?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\Formatter;
+
+/**
+ * Formatter interface.
+ */
+interface Formatter
+{
+    /**
+     * @param \Reflector $reflector
+     *
+     * @return string
+     */
+    public static function format(\Reflector $reflector);
+}

vendor/psy/psysh/src/Formatter/SignatureFormatter.php

@@ -0,0 +1,308 @@
+<?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\Formatter;
+
+use Psy\Reflection\ReflectionClassConstant;
+use Psy\Reflection\ReflectionConstant_;
+use Psy\Reflection\ReflectionLanguageConstruct;
+use Psy\Util\Json;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+
+/**
+ * An abstract representation of a function, class or property signature.
+ */
+class SignatureFormatter implements Formatter
+{
+    /**
+     * Format a signature for the given reflector.
+     *
+     * Defers to subclasses to do the actual formatting.
+     *
+     * @param \Reflector $reflector
+     *
+     * @return string Formatted signature
+     */
+    public static function format(\Reflector $reflector)
+    {
+        switch (true) {
+            case $reflector instanceof \ReflectionFunction:
+            case $reflector instanceof ReflectionLanguageConstruct:
+                return self::formatFunction($reflector);
+
+            // this case also covers \ReflectionObject:
+            case $reflector instanceof \ReflectionClass:
+                return self::formatClass($reflector);
+
+            case $reflector instanceof ReflectionClassConstant:
+            case $reflector instanceof \ReflectionClassConstant:
+                return self::formatClassConstant($reflector);
+
+            case $reflector instanceof \ReflectionMethod:
+                return self::formatMethod($reflector);
+
+            case $reflector instanceof \ReflectionProperty:
+                return self::formatProperty($reflector);
+
+            case $reflector instanceof ReflectionConstant_:
+                return self::formatConstant($reflector);
+
+            default:
+                throw new \InvalidArgumentException('Unexpected Reflector class: ' . \get_class($reflector));
+        }
+    }
+
+    /**
+     * Print the signature name.
+     *
+     * @param \Reflector $reflector
+     *
+     * @return string Formatted name
+     */
+    public static function formatName(\Reflector $reflector)
+    {
+        return $reflector->getName();
+    }
+
+    /**
+     * Print the method, property or class modifiers.
+     *
+     * @param \Reflector $reflector
+     *
+     * @return string Formatted modifiers
+     */
+    private static function formatModifiers(\Reflector $reflector)
+    {
+        if ($reflector instanceof \ReflectionClass && $reflector->isTrait()) {
+            // For some reason, PHP 5.x returns `abstract public` modifiers for
+            // traits. Let's just ignore that business entirely.
+            if (\version_compare(PHP_VERSION, '7.0.0', '<')) {
+                return [];
+            }
+        }
+
+        return \implode(' ', \array_map(function ($modifier) {
+            return \sprintf('<keyword>%s</keyword>', $modifier);
+        }, \Reflection::getModifierNames($reflector->getModifiers())));
+    }
+
+    /**
+     * Format a class signature.
+     *
+     * @param \ReflectionClass $reflector
+     *
+     * @return string Formatted signature
+     */
+    private static function formatClass(\ReflectionClass $reflector)
+    {
+        $chunks = [];
+
+        if ($modifiers = self::formatModifiers($reflector)) {
+            $chunks[] = $modifiers;
+        }
+
+        if ($reflector->isTrait()) {
+            $chunks[] = 'trait';
+        } else {
+            $chunks[] = $reflector->isInterface() ? 'interface' : 'class';
+        }
+
+        $chunks[] = \sprintf('<class>%s</class>', self::formatName($reflector));
+
+        if ($parent = $reflector->getParentClass()) {
+            $chunks[] = 'extends';
+            $chunks[] = \sprintf('<class>%s</class>', $parent->getName());
+        }
+
+        $interfaces = $reflector->getInterfaceNames();
+        if (!empty($interfaces)) {
+            \sort($interfaces);
+
+            $chunks[] = 'implements';
+            $chunks[] = \implode(', ', \array_map(function ($name) {
+                return \sprintf('<class>%s</class>', $name);
+            }, $interfaces));
+        }
+
+        return \implode(' ', $chunks);
+    }
+
+    /**
+     * Format a constant signature.
+     *
+     * @param ReflectionClassConstant|\ReflectionClassConstant $reflector
+     *
+     * @return string Formatted signature
+     */
+    private static function formatClassConstant($reflector)
+    {
+        $value = $reflector->getValue();
+        $style = self::getTypeStyle($value);
+
+        return \sprintf(
+            '<keyword>const</keyword> <const>%s</const> = <%s>%s</%s>',
+            self::formatName($reflector),
+            $style,
+            OutputFormatter::escape(Json::encode($value)),
+            $style
+        );
+    }
+
+    /**
+     * Format a constant signature.
+     *
+     * @param ReflectionConstant_ $reflector
+     *
+     * @return string Formatted signature
+     */
+    private static function formatConstant($reflector)
+    {
+        $value = $reflector->getValue();
+        $style = self::getTypeStyle($value);
+
+        return \sprintf(
+            '<keyword>define</keyword>(<string>%s</string>, <%s>%s</%s>)',
+            OutputFormatter::escape(Json::encode($reflector->getName())),
+            $style,
+            OutputFormatter::escape(Json::encode($value)),
+            $style
+        );
+    }
+
+    /**
+     * Helper for getting output style for a given value's type.
+     *
+     * @param mixed $value
+     *
+     * @return string
+     */
+    private static function getTypeStyle($value)
+    {
+        if (\is_int($value) || \is_float($value)) {
+            return 'number';
+        } elseif (\is_string($value)) {
+            return 'string';
+        } elseif (\is_bool($value) || \is_null($value)) {
+            return 'bool';
+        } else {
+            return 'strong'; // @codeCoverageIgnore
+        }
+    }
+
+    /**
+     * Format a property signature.
+     *
+     * @param \ReflectionProperty $reflector
+     *
+     * @return string Formatted signature
+     */
+    private static function formatProperty(\ReflectionProperty $reflector)
+    {
+        return \sprintf(
+            '%s <strong>$%s</strong>',
+            self::formatModifiers($reflector),
+            $reflector->getName()
+        );
+    }
+
+    /**
+     * Format a function signature.
+     *
+     * @param \ReflectionFunction $reflector
+     *
+     * @return string Formatted signature
+     */
+    private static function formatFunction(\ReflectionFunctionAbstract $reflector)
+    {
+        return \sprintf(
+            '<keyword>function</keyword> %s<function>%s</function>(%s)',
+            $reflector->returnsReference() ? '&' : '',
+            self::formatName($reflector),
+            \implode(', ', self::formatFunctionParams($reflector))
+        );
+    }
+
+    /**
+     * Format a method signature.
+     *
+     * @param \ReflectionMethod $reflector
+     *
+     * @return string Formatted signature
+     */
+    private static function formatMethod(\ReflectionMethod $reflector)
+    {
+        return \sprintf(
+            '%s %s',
+            self::formatModifiers($reflector),
+            self::formatFunction($reflector)
+        );
+    }
+
+    /**
+     * Print the function params.
+     *
+     * @param \ReflectionFunctionAbstract $reflector
+     *
+     * @return array
+     */
+    private static function formatFunctionParams(\ReflectionFunctionAbstract $reflector)
+    {
+        $params = [];
+        foreach ($reflector->getParameters() as $param) {
+            $hint = '';
+            try {
+                if ($param->isArray()) {
+                    $hint = '<keyword>array</keyword> ';
+                } elseif ($class = $param->getClass()) {
+                    $hint = \sprintf('<class>%s</class> ', $class->getName());
+                }
+            } catch (\Exception $e) {
+                // sometimes we just don't know...
+                // bad class names, or autoloaded classes that haven't been loaded yet, or whathaveyou.
+                // come to think of it, the only time I've seen this is with the intl extension.
+
+                // Hax: we'll try to extract it :P
+
+                // @codeCoverageIgnoreStart
+                $chunks = \explode('$' . $param->getName(), (string) $param);
+                $chunks = \explode(' ', \trim($chunks[0]));
+                $guess  = \end($chunks);
+
+                $hint = \sprintf('<urgent>%s</urgent> ', $guess);
+                // @codeCoverageIgnoreEnd
+            }
+
+            if ($param->isOptional()) {
+                if (!$param->isDefaultValueAvailable()) {
+                    $value     = 'unknown';
+                    $typeStyle = 'urgent';
+                } else {
+                    $value     = $param->getDefaultValue();
+                    $typeStyle = self::getTypeStyle($value);
+                    $value     = \is_array($value) ? 'array()' : \is_null($value) ? 'null' : \var_export($value, true);
+                }
+                $default = \sprintf(' = <%s>%s</%s>', $typeStyle, OutputFormatter::escape($value), $typeStyle);
+            } else {
+                $default = '';
+            }
+
+            $params[] = \sprintf(
+                '%s%s<strong>$%s</strong>%s',
+                $param->isPassedByReference() ? '&' : '',
+                $hint,
+                $param->getName(),
+                $default
+            );
+        }
+
+        return $params;
+    }
+}

vendor/psy/psysh/src/Input/CodeArgument.php

@@ -0,0 +1,50 @@
+<?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\Input;
+
+use Symfony\Component\Console\Input\InputArgument;
+
+/**
+ * An input argument for code.
+ *
+ * A CodeArgument must be the final argument of the command. Once all options
+ * and other arguments are used, any remaining input until the end of the string
+ * is considered part of a single CodeArgument, regardless of spaces, quoting,
+ * escaping, etc.
+ *
+ * This means commands can support crazy input like
+ *
+ *     parse function() { return "wheee\n"; }
+ *
+ * ... without having to put the code in a quoted string and escape everything.
+ */
+class CodeArgument extends InputArgument
+{
+    /**
+     * Constructor.
+     *
+     * @param string $name        The argument name
+     * @param int    $mode        The argument mode: self::REQUIRED or self::OPTIONAL
+     * @param string $description A description text
+     * @param mixed  $default     The default value (for self::OPTIONAL mode only)
+     *
+     * @throws \InvalidArgumentException When argument mode is not valid
+     */
+    public function __construct($name, $mode = null, $description = '', $default = null)
+    {
+        if ($mode & InputArgument::IS_ARRAY) {
+            throw new \InvalidArgumentException('Argument mode IS_ARRAY is not valid');
+        }
+
+        parent::__construct($name, $mode, $description, $default);
+    }
+}

vendor/psy/psysh/src/Input/FilterOptions.php

@@ -0,0 +1,145 @@
+<?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\Input;
+
+use Psy\Exception\ErrorException;
+use Psy\Exception\RuntimeException;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+
+/**
+ * Parse, validate and match --grep, --insensitive and --invert command options.
+ */
+class FilterOptions
+{
+    private $filter = false;
+    private $pattern;
+    private $insensitive;
+    private $invert;
+
+    /**
+     * Get input option definitions for filtering.
+     *
+     * @return InputOption[]
+     */
+    public static function getOptions()
+    {
+        return [
+            new InputOption('grep',        'G', InputOption::VALUE_REQUIRED, 'Limit to items matching the given pattern (string or regex).'),
+            new InputOption('insensitive', 'i', InputOption::VALUE_NONE,     'Case-insensitive search (requires --grep).'),
+            new InputOption('invert',      'v', InputOption::VALUE_NONE,     'Inverted search (requires --grep).'),
+        ];
+    }
+
+    /**
+     * Bind input and prepare filter.
+     *
+     * @param InputInterface $input
+     */
+    public function bind(InputInterface $input)
+    {
+        $this->validateInput($input);
+
+        if (!$pattern = $input->getOption('grep')) {
+            $this->filter = false;
+
+            return;
+        }
+
+        if (!$this->stringIsRegex($pattern)) {
+            $pattern = '/' . \preg_quote($pattern, '/') . '/';
+        }
+
+        if ($insensitive = $input->getOption('insensitive')) {
+            $pattern .= 'i';
+        }
+
+        $this->validateRegex($pattern);
+
+        $this->filter      = true;
+        $this->pattern     = $pattern;
+        $this->insensitive = $insensitive;
+        $this->invert      = $input->getOption('invert');
+    }
+
+    /**
+     * Check whether the bound input has filter options.
+     *
+     * @return bool
+     */
+    public function hasFilter()
+    {
+        return $this->filter;
+    }
+
+    /**
+     * Check whether a string matches the current filter options.
+     *
+     * @param string $string
+     * @param array  $matches
+     *
+     * @return bool
+     */
+    public function match($string, array &$matches = null)
+    {
+        return $this->filter === false || (\preg_match($this->pattern, $string, $matches) xor $this->invert);
+    }
+
+    /**
+     * Validate that grep, invert and insensitive input options are consistent.
+     *
+     * @param InputInterface $input
+     *
+     * @return bool
+     */
+    private function validateInput(InputInterface $input)
+    {
+        if (!$input->getOption('grep')) {
+            foreach (['invert', 'insensitive'] as $option) {
+                if ($input->getOption($option)) {
+                    throw new RuntimeException('--' . $option . ' does not make sense without --grep');
+                }
+            }
+        }
+    }
+
+    /**
+     * Check whether a string appears to be a regular expression.
+     *
+     * @param string $string
+     *
+     * @return bool
+     */
+    private function stringIsRegex($string)
+    {
+        return \substr($string, 0, 1) === '/' && \substr($string, -1) === '/' && \strlen($string) >= 3;
+    }
+
+    /**
+     * Validate that $pattern is a valid regular expression.
+     *
+     * @param string $pattern
+     *
+     * @return bool
+     */
+    private function validateRegex($pattern)
+    {
+        \set_error_handler(['Psy\Exception\ErrorException', 'throwException']);
+        try {
+            \preg_match($pattern, '');
+        } catch (ErrorException $e) {
+            \restore_error_handler();
+            throw new RuntimeException(\str_replace('preg_match(): ', 'Invalid regular expression: ', $e->getRawMessage()));
+        }
+        \restore_error_handler();
+    }
+}

vendor/psy/psysh/src/Input/ShellInput.php

@@ -0,0 +1,336 @@
+<?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\Input;
+
+use Symfony\Component\Console\Input\InputDefinition;
+use Symfony\Component\Console\Input\StringInput;
+
+/**
+ * A StringInput subclass specialized for code arguments.
+ */
+class ShellInput extends StringInput
+{
+    private $hasCodeArgument = false;
+
+    /**
+     * Unlike the parent implementation's tokens, this contains an array of
+     * token/rest pairs, so that code arguments can be handled while parsing.
+     */
+    private $tokenPairs;
+    private $parsed;
+
+    /**
+     * Constructor.
+     *
+     * @param string $input An array of parameters from the CLI (in the argv format)
+     */
+    public function __construct($input)
+    {
+        parent::__construct($input);
+
+        $this->tokenPairs = $this->tokenize($input);
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws \InvalidArgumentException if $definition has CodeArgument before the final argument position
+     */
+    public function bind(InputDefinition $definition)
+    {
+        $hasCodeArgument = false;
+
+        if ($definition->getArgumentCount() > 0) {
+            $args    = $definition->getArguments();
+            $lastArg = \array_pop($args);
+            foreach ($args as $arg) {
+                if ($arg instanceof CodeArgument) {
+                    $msg = \sprintf('Unexpected CodeArgument before the final position: %s', $arg->getName());
+                    throw new \InvalidArgumentException($msg);
+                }
+            }
+
+            if ($lastArg instanceof CodeArgument) {
+                $hasCodeArgument = true;
+            }
+        }
+
+        $this->hasCodeArgument = $hasCodeArgument;
+
+        return parent::bind($definition);
+    }
+
+    /**
+     * Tokenizes a string.
+     *
+     * The version of this on StringInput is good, but doesn't handle code
+     * arguments if they're at all complicated. This does :)
+     *
+     * @param string $input The input to tokenize
+     *
+     * @return array An array of token/rest pairs
+     *
+     * @throws \InvalidArgumentException When unable to parse input (should never happen)
+     */
+    private function tokenize($input)
+    {
+        $tokens = [];
+        $length = \strlen($input);
+        $cursor = 0;
+        while ($cursor < $length) {
+            if (\preg_match('/\s+/A', $input, $match, null, $cursor)) {
+            } elseif (\preg_match('/([^="\'\s]+?)(=?)(' . StringInput::REGEX_QUOTED_STRING . '+)/A', $input, $match, null, $cursor)) {
+                $tokens[] = [
+                    $match[1] . $match[2] . \stripcslashes(\str_replace(['"\'', '\'"', '\'\'', '""'], '', \substr($match[3], 1, \strlen($match[3]) - 2))),
+                    \stripcslashes(\substr($input, $cursor)),
+                ];
+            } elseif (\preg_match('/' . StringInput::REGEX_QUOTED_STRING . '/A', $input, $match, null, $cursor)) {
+                $tokens[] = [
+                    \stripcslashes(\substr($match[0], 1, \strlen($match[0]) - 2)),
+                    \stripcslashes(\substr($input, $cursor)),
+                ];
+            } elseif (\preg_match('/' . StringInput::REGEX_STRING . '/A', $input, $match, null, $cursor)) {
+                $tokens[] = [
+                    \stripcslashes($match[1]),
+                    \stripcslashes(\substr($input, $cursor)),
+                ];
+            } else {
+                // should never happen
+                // @codeCoverageIgnoreStart
+                throw new \InvalidArgumentException(\sprintf('Unable to parse input near "... %s ..."', \substr($input, $cursor, 10)));
+                // @codeCoverageIgnoreEnd
+            }
+
+            $cursor += \strlen($match[0]);
+        }
+
+        return $tokens;
+    }
+
+    /**
+     * Same as parent, but with some bonus handling for code arguments.
+     */
+    protected function parse()
+    {
+        $parseOptions = true;
+        $this->parsed = $this->tokenPairs;
+        while (null !== $tokenPair = \array_shift($this->parsed)) {
+            // token is what you'd expect. rest is the remainder of the input
+            // string, including token, and will be used if this is a code arg.
+            list($token, $rest) = $tokenPair;
+
+            if ($parseOptions && '' === $token) {
+                $this->parseShellArgument($token, $rest);
+            } elseif ($parseOptions && '--' === $token) {
+                $parseOptions = false;
+            } elseif ($parseOptions && 0 === \strpos($token, '--')) {
+                $this->parseLongOption($token);
+            } elseif ($parseOptions && '-' === $token[0] && '-' !== $token) {
+                $this->parseShortOption($token);
+            } else {
+                $this->parseShellArgument($token, $rest);
+            }
+        }
+    }
+
+    /**
+     * Parses an argument, with bonus handling for code arguments.
+     *
+     * @param string $token The current token
+     * @param string $rest  The remaining unparsed input, including the current token
+     *
+     * @throws \RuntimeException When too many arguments are given
+     */
+    private function parseShellArgument($token, $rest)
+    {
+        $c = \count($this->arguments);
+
+        // if input is expecting another argument, add it
+        if ($this->definition->hasArgument($c)) {
+            $arg = $this->definition->getArgument($c);
+
+            if ($arg instanceof CodeArgument) {
+                // When we find a code argument, we're done parsing. Add the
+                // remaining input to the current argument and call it a day.
+                $this->parsed = [];
+                $this->arguments[$arg->getName()] = $rest;
+            } else {
+                $this->arguments[$arg->getName()] = $arg->isArray() ? [$token] : $token;
+            }
+
+            return;
+        }
+
+        // (copypasta)
+        //
+        // @codeCoverageIgnoreStart
+
+        // if last argument isArray(), append token to last argument
+        if ($this->definition->hasArgument($c - 1) && $this->definition->getArgument($c - 1)->isArray()) {
+            $arg = $this->definition->getArgument($c - 1);
+            $this->arguments[$arg->getName()][] = $token;
+
+            return;
+        }
+
+        // unexpected argument
+        $all = $this->definition->getArguments();
+        if (\count($all)) {
+            throw new \RuntimeException(\sprintf('Too many arguments, expected arguments "%s".', \implode('" "', \array_keys($all))));
+        }
+
+        throw new \RuntimeException(\sprintf('No arguments expected, got "%s".', $token));
+        // @codeCoverageIgnoreEnd
+    }
+
+    // Everything below this is copypasta from ArgvInput private methods
+    // @codeCoverageIgnoreStart
+
+    /**
+     * Parses a short option.
+     *
+     * @param string $token The current token
+     */
+    private function parseShortOption($token)
+    {
+        $name = \substr($token, 1);
+
+        if (\strlen($name) > 1) {
+            if ($this->definition->hasShortcut($name[0]) && $this->definition->getOptionForShortcut($name[0])->acceptValue()) {
+                // an option with a value (with no space)
+                $this->addShortOption($name[0], \substr($name, 1));
+            } else {
+                $this->parseShortOptionSet($name);
+            }
+        } else {
+            $this->addShortOption($name, null);
+        }
+    }
+
+    /**
+     * Parses a short option set.
+     *
+     * @param string $name The current token
+     *
+     * @throws \RuntimeException When option given doesn't exist
+     */
+    private function parseShortOptionSet($name)
+    {
+        $len = \strlen($name);
+        for ($i = 0; $i < $len; $i++) {
+            if (!$this->definition->hasShortcut($name[$i])) {
+                throw new \RuntimeException(\sprintf('The "-%s" option does not exist.', $name[$i]));
+            }
+
+            $option = $this->definition->getOptionForShortcut($name[$i]);
+            if ($option->acceptValue()) {
+                $this->addLongOption($option->getName(), $i === $len - 1 ? null : \substr($name, $i + 1));
+
+                break;
+            } else {
+                $this->addLongOption($option->getName(), null);
+            }
+        }
+    }
+
+    /**
+     * Parses a long option.
+     *
+     * @param string $token The current token
+     */
+    private function parseLongOption($token)
+    {
+        $name = \substr($token, 2);
+
+        if (false !== $pos = \strpos($name, '=')) {
+            if (0 === \strlen($value = \substr($name, $pos + 1))) {
+                // if no value after "=" then substr() returns "" since php7 only, false before
+                // see http://php.net/manual/fr/migration70.incompatible.php#119151
+                if (PHP_VERSION_ID < 70000 && false === $value) {
+                    $value = '';
+                }
+                \array_unshift($this->parsed, [$value, null]);
+            }
+            $this->addLongOption(\substr($name, 0, $pos), $value);
+        } else {
+            $this->addLongOption($name, null);
+        }
+    }
+
+    /**
+     * Adds a short option value.
+     *
+     * @param string $shortcut The short option key
+     * @param mixed  $value    The value for the option
+     *
+     * @throws \RuntimeException When option given doesn't exist
+     */
+    private function addShortOption($shortcut, $value)
+    {
+        if (!$this->definition->hasShortcut($shortcut)) {
+            throw new \RuntimeException(\sprintf('The "-%s" option does not exist.', $shortcut));
+        }
+
+        $this->addLongOption($this->definition->getOptionForShortcut($shortcut)->getName(), $value);
+    }
+
+    /**
+     * Adds a long option value.
+     *
+     * @param string $name  The long option key
+     * @param mixed  $value The value for the option
+     *
+     * @throws \RuntimeException When option given doesn't exist
+     */
+    private function addLongOption($name, $value)
+    {
+        if (!$this->definition->hasOption($name)) {
+            throw new \RuntimeException(\sprintf('The "--%s" option does not exist.', $name));
+        }
+
+        $option = $this->definition->getOption($name);
+
+        if (null !== $value && !$option->acceptValue()) {
+            throw new \RuntimeException(\sprintf('The "--%s" option does not accept a value.', $name));
+        }
+
+        if (\in_array($value, ['', null], true) && $option->acceptValue() && \count($this->parsed)) {
+            // if option accepts an optional or mandatory argument
+            // let's see if there is one provided
+            $next = \array_shift($this->parsed);
+            $nextToken = $next[0];
+            if ((isset($nextToken[0]) && '-' !== $nextToken[0]) || \in_array($nextToken, ['', null], true)) {
+                $value = $nextToken;
+            } else {
+                \array_unshift($this->parsed, $next);
+            }
+        }
+
+        if (null === $value) {
+            if ($option->isValueRequired()) {
+                throw new \RuntimeException(\sprintf('The "--%s" option requires a value.', $name));
+            }
+
+            if (!$option->isArray() && !$option->isValueOptional()) {
+                $value = true;
+            }
+        }
+
+        if ($option->isArray()) {
+            $this->options[$name][] = $value;
+        } else {
+            $this->options[$name] = $value;
+        }
+    }
+
+    // @codeCoverageIgnoreEnd
+}

vendor/psy/psysh/src/Input/SilentInput.php

@@ -0,0 +1,44 @@
+<?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\Input;
+
+/**
+ * A simple class used internally by PsySH to represent silent input.
+ *
+ * Silent input is generally used for non-user-generated code, such as the
+ * rewritten user code run by sudo command. Silent input isn't echoed before
+ * evaluating, and it's not added to the readline history.
+ */
+class SilentInput
+{
+    private $inputString;
+
+    /**
+     * Constructor.
+     *
+     * @param string $inputString
+     */
+    public function __construct($inputString)
+    {
+        $this->inputString = $inputString;
+    }
+
+    /**
+     * To. String.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->inputString;
+    }
+}

vendor/psy/psysh/src/Output/OutputPager.php

@@ -0,0 +1,26 @@
+<?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\Output;
+
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * An output pager is much the same as a regular OutputInterface, but allows
+ * the stream to be flushed to a pager periodically.
+ */
+interface OutputPager extends OutputInterface
+{
+    /**
+     * Close the current pager process.
+     */
+    public function close();
+}

vendor/psy/psysh/src/Output/PassthruPager.php

@@ -0,0 +1,39 @@
+<?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\Output;
+
+use Symfony\Component\Console\Output\StreamOutput;
+
+/**
+ * A passthrough pager is a no-op. It simply wraps a StreamOutput's stream and
+ * does nothing when the pager is closed.
+ */
+class PassthruPager extends StreamOutput implements OutputPager
+{
+    /**
+     * Constructor.
+     *
+     * @param StreamOutput $output
+     */
+    public function __construct(StreamOutput $output)
+    {
+        parent::__construct($output->getStream());
+    }
+
+    /**
+     * Close the current pager process.
+     */
+    public function close()
+    {
+        // nothing to do here
+    }
+}

vendor/psy/psysh/src/Output/ProcOutputPager.php

@@ -0,0 +1,103 @@
+<?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\Output;
+
+use Symfony\Component\Console\Output\StreamOutput;
+
+/**
+ * ProcOutputPager class.
+ *
+ * A ProcOutputPager instance wraps a regular StreamOutput's stream. Rather
+ * than writing directly to the stream, it shells out to a pager process and
+ * gives that process the stream as stdout. This means regular *nix commands
+ * like `less` and `more` can be used to page large amounts of output.
+ */
+class ProcOutputPager extends StreamOutput implements OutputPager
+{
+    private $proc;
+    private $pipe;
+    private $stream;
+    private $cmd;
+
+    /**
+     * Constructor.
+     *
+     * @param StreamOutput $output
+     * @param string       $cmd    Pager process command (default: 'less -R -S -F -X')
+     */
+    public function __construct(StreamOutput $output, $cmd = 'less -R -S -F -X')
+    {
+        $this->stream = $output->getStream();
+        $this->cmd    = $cmd;
+    }
+
+    /**
+     * Writes a message to the output.
+     *
+     * @param string $message A message to write to the output
+     * @param bool   $newline Whether to add a newline or not
+     *
+     * @throws \RuntimeException When unable to write output (should never happen)
+     */
+    public function doWrite($message, $newline)
+    {
+        $pipe = $this->getPipe();
+        if (false === @\fwrite($pipe, $message . ($newline ? PHP_EOL : ''))) {
+            // @codeCoverageIgnoreStart
+            // should never happen
+            throw new \RuntimeException('Unable to write output');
+            // @codeCoverageIgnoreEnd
+        }
+
+        \fflush($pipe);
+    }
+
+    /**
+     * Close the current pager process.
+     */
+    public function close()
+    {
+        if (isset($this->pipe)) {
+            \fclose($this->pipe);
+        }
+
+        if (isset($this->proc)) {
+            $exit = \proc_close($this->proc);
+            if ($exit !== 0) {
+                throw new \RuntimeException('Error closing output stream');
+            }
+        }
+
+        unset($this->pipe, $this->proc);
+    }
+
+    /**
+     * Get a pipe for paging output.
+     *
+     * If no active pager process exists, fork one and return its input pipe.
+     */
+    private function getPipe()
+    {
+        if (!isset($this->pipe) || !isset($this->proc)) {
+            $desc = [['pipe', 'r'], $this->stream, \fopen('php://stderr', 'w')];
+            $this->proc = \proc_open($this->cmd, $desc, $pipes);
+
+            if (!\is_resource($this->proc)) {
+                throw new \RuntimeException('Error opening output stream');
+            }
+
+            $this->pipe = $pipes[0];
+        }
+
+        return $this->pipe;
+    }
+}

vendor/psy/psysh/src/Output/ShellOutput.php

@@ -0,0 +1,204 @@
+<?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\Output;
+
+use Symfony\Component\Console\Formatter\OutputFormatterInterface;
+use Symfony\Component\Console\Formatter\OutputFormatterStyle;
+use Symfony\Component\Console\Output\ConsoleOutput;
+
+/**
+ * A ConsoleOutput subclass specifically for Psy Shell output.
+ */
+class ShellOutput extends ConsoleOutput
+{
+    const NUMBER_LINES = 128;
+
+    private $paging = 0;
+    private $pager;
+
+    /**
+     * Construct a ShellOutput instance.
+     *
+     * @param mixed                    $verbosity (default: self::VERBOSITY_NORMAL)
+     * @param bool                     $decorated (default: null)
+     * @param OutputFormatterInterface $formatter (default: null)
+     * @param null|string|OutputPager  $pager     (default: null)
+     */
+    public function __construct($verbosity = self::VERBOSITY_NORMAL, $decorated = null, OutputFormatterInterface $formatter = null, $pager = null)
+    {
+        parent::__construct($verbosity, $decorated, $formatter);
+
+        $this->initFormatters();
+
+        if ($pager === null) {
+            $this->pager = new PassthruPager($this);
+        } elseif (\is_string($pager)) {
+            $this->pager = new ProcOutputPager($this, $pager);
+        } elseif ($pager instanceof OutputPager) {
+            $this->pager = $pager;
+        } else {
+            throw new \InvalidArgumentException('Unexpected pager parameter: ' . $pager);
+        }
+    }
+
+    /**
+     * Page multiple lines of output.
+     *
+     * The output pager is started
+     *
+     * If $messages is callable, it will be called, passing this output instance
+     * for rendering. Otherwise, all passed $messages are paged to output.
+     *
+     * Upon completion, the output pager is flushed.
+     *
+     * @param string|array|\Closure $messages A string, array of strings or a callback
+     * @param int                   $type     (default: 0)
+     */
+    public function page($messages, $type = 0)
+    {
+        if (\is_string($messages)) {
+            $messages = (array) $messages;
+        }
+
+        if (!\is_array($messages) && !\is_callable($messages)) {
+            throw new \InvalidArgumentException('Paged output requires a string, array or callback');
+        }
+
+        $this->startPaging();
+
+        if (\is_callable($messages)) {
+            $messages($this);
+        } else {
+            $this->write($messages, true, $type);
+        }
+
+        $this->stopPaging();
+    }
+
+    /**
+     * Start sending output to the output pager.
+     */
+    public function startPaging()
+    {
+        $this->paging++;
+    }
+
+    /**
+     * Stop paging output and flush the output pager.
+     */
+    public function stopPaging()
+    {
+        $this->paging--;
+        $this->closePager();
+    }
+
+    /**
+     * Writes a message to the output.
+     *
+     * Optionally, pass `$type | self::NUMBER_LINES` as the $type parameter to
+     * number the lines of output.
+     *
+     * @throws \InvalidArgumentException When unknown output type is given
+     *
+     * @param string|array $messages The message as an array of lines or a single string
+     * @param bool         $newline  Whether to add a newline or not
+     * @param int          $type     The type of output
+     */
+    public function write($messages, $newline = false, $type = 0)
+    {
+        if ($this->getVerbosity() === self::VERBOSITY_QUIET) {
+            return;
+        }
+
+        $messages = (array) $messages;
+
+        if ($type & self::NUMBER_LINES) {
+            $pad = \strlen((string) \count($messages));
+            $template = $this->isDecorated() ? "<aside>%{$pad}s</aside>: %s" : "%{$pad}s: %s";
+
+            if ($type & self::OUTPUT_RAW) {
+                $messages = \array_map(['Symfony\Component\Console\Formatter\OutputFormatter', 'escape'], $messages);
+            }
+
+            foreach ($messages as $i => $line) {
+                $messages[$i] = \sprintf($template, $i, $line);
+            }
+
+            // clean this up for super.
+            $type = $type & ~self::NUMBER_LINES & ~self::OUTPUT_RAW;
+        }
+
+        parent::write($messages, $newline, $type);
+    }
+
+    /**
+     * Writes a message to the output.
+     *
+     * Handles paged output, or writes directly to the output stream.
+     *
+     * @param string $message A message to write to the output
+     * @param bool   $newline Whether to add a newline or not
+     */
+    public function doWrite($message, $newline)
+    {
+        if ($this->paging > 0) {
+            $this->pager->doWrite($message, $newline);
+        } else {
+            parent::doWrite($message, $newline);
+        }
+    }
+
+    /**
+     * Flush and close the output pager.
+     */
+    private function closePager()
+    {
+        if ($this->paging <= 0) {
+            $this->pager->close();
+        }
+    }
+
+    /**
+     * Initialize output formatter styles.
+     */
+    private function initFormatters()
+    {
+        $formatter = $this->getFormatter();
+
+        $formatter->setStyle('warning', new OutputFormatterStyle('black', 'yellow'));
+        $formatter->setStyle('error',   new OutputFormatterStyle('black', 'red', ['bold']));
+        $formatter->setStyle('aside',   new OutputFormatterStyle('blue'));
+        $formatter->setStyle('strong',  new OutputFormatterStyle(null, null, ['bold']));
+        $formatter->setStyle('return',  new OutputFormatterStyle('cyan'));
+        $formatter->setStyle('urgent',  new OutputFormatterStyle('red'));
+        $formatter->setStyle('hidden',  new OutputFormatterStyle('black'));
+
+        // Visibility
+        $formatter->setStyle('public',    new OutputFormatterStyle(null, null, ['bold']));
+        $formatter->setStyle('protected', new OutputFormatterStyle('yellow'));
+        $formatter->setStyle('private',   new OutputFormatterStyle('red'));
+        $formatter->setStyle('global',    new OutputFormatterStyle('cyan', null, ['bold']));
+        $formatter->setStyle('const',     new OutputFormatterStyle('cyan'));
+        $formatter->setStyle('class',     new OutputFormatterStyle('blue', null, ['underscore']));
+        $formatter->setStyle('function',  new OutputFormatterStyle(null));
+        $formatter->setStyle('default',   new OutputFormatterStyle(null));
+
+        // Types
+        $formatter->setStyle('number',   new OutputFormatterStyle('magenta'));
+        $formatter->setStyle('string',   new OutputFormatterStyle('green'));
+        $formatter->setStyle('bool',     new OutputFormatterStyle('cyan'));
+        $formatter->setStyle('keyword',  new OutputFormatterStyle('yellow'));
+        $formatter->setStyle('comment',  new OutputFormatterStyle('blue'));
+        $formatter->setStyle('object',   new OutputFormatterStyle('blue'));
+        $formatter->setStyle('resource', new OutputFormatterStyle('yellow'));
+    }
+}

vendor/psy/psysh/src/ParserFactory.php

@@ -0,0 +1,91 @@
+<?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;
+
+use PhpParser\Lexer;
+use PhpParser\Parser;
+use PhpParser\ParserFactory as OriginalParserFactory;
+
+/**
+ * Parser factory to abstract over PHP parser library versions.
+ */
+class ParserFactory
+{
+    const ONLY_PHP5   = 'ONLY_PHP5';
+    const ONLY_PHP7   = 'ONLY_PHP7';
+    const PREFER_PHP5 = 'PREFER_PHP5';
+    const PREFER_PHP7 = 'PREFER_PHP7';
+
+    /**
+     * Possible kinds of parsers for the factory, from PHP parser library.
+     *
+     * @return array
+     */
+    public static function getPossibleKinds()
+    {
+        return ['ONLY_PHP5', 'ONLY_PHP7', 'PREFER_PHP5', 'PREFER_PHP7'];
+    }
+
+    /**
+     * Is this parser factory supports kinds?
+     *
+     * PHP parser < 2.0 doesn't support kinds, >= 2.0 — does.
+     *
+     * @return bool
+     */
+    public function hasKindsSupport()
+    {
+        return \class_exists('PhpParser\ParserFactory');
+    }
+
+    /**
+     * Default kind (if supported, based on current interpreter's version).
+     *
+     * @return string|null
+     */
+    public function getDefaultKind()
+    {
+        if ($this->hasKindsSupport()) {
+            return \version_compare(PHP_VERSION, '7.0', '>=') ? static::ONLY_PHP7 : static::ONLY_PHP5;
+        }
+    }
+
+    /**
+     * New parser instance with given kind.
+     *
+     * @param string|null $kind One of class constants (only for PHP parser 2.0 and above)
+     *
+     * @return Parser
+     */
+    public function createParser($kind = null)
+    {
+        if ($this->hasKindsSupport()) {
+            $originalFactory = new OriginalParserFactory();
+
+            $kind = $kind ?: $this->getDefaultKind();
+
+            if (!\in_array($kind, static::getPossibleKinds())) {
+                throw new \InvalidArgumentException('Unknown parser kind');
+            }
+
+            $parser = $originalFactory->create(\constant('PhpParser\ParserFactory::' . $kind));
+        } else {
+            if ($kind !== null) {
+                throw new \InvalidArgumentException('Install PHP Parser v2.x to specify parser kind');
+            }
+
+            $parser = new Parser(new Lexer());
+        }
+
+        return $parser;
+    }
+}

vendor/psy/psysh/src/Readline/GNUReadline.php

@@ -0,0 +1,170 @@
+<?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\Readline;
+
+/**
+ * A Readline interface implementation for GNU Readline.
+ *
+ * This is by far the coolest way to do it, but it doesn't work with new PHP.
+ *
+ * Oh well.
+ */
+class GNUReadline implements Readline
+{
+    /** @var string|false */
+    protected $historyFile;
+    /** @var int */
+    protected $historySize;
+    /** @var bool */
+    protected $eraseDups;
+
+    /**
+     * GNU Readline is supported iff `readline_list_history` is defined. PHP
+     * decided it would be awesome to swap out GNU Readline for Libedit, but
+     * they ended up shipping an incomplete implementation. So we've got this.
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return \function_exists('readline_list_history');
+    }
+
+    /**
+     * GNU Readline constructor.
+     *
+     * @param string|false $historyFile
+     * @param int          $historySize
+     * @param bool         $eraseDups
+     */
+    public function __construct($historyFile = null, $historySize = 0, $eraseDups = false)
+    {
+        $this->historyFile = ($historyFile !== null) ? $historyFile : false;
+        $this->historySize = $historySize;
+        $this->eraseDups   = $eraseDups;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addHistory($line)
+    {
+        if ($res = \readline_add_history($line)) {
+            $this->writeHistory();
+        }
+
+        return $res;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function clearHistory()
+    {
+        if ($res = \readline_clear_history()) {
+            $this->writeHistory();
+        }
+
+        return $res;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function listHistory()
+    {
+        return readline_list_history();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function readHistory()
+    {
+        // Workaround PHP bug #69054
+        //
+        // If open_basedir is set, readline_read_history() segfaults. This was fixed in 5.6.7:
+        //
+        //     https://github.com/php/php-src/blob/423a057023ef3c00d2ffc16a6b43ba01d0f71796/NEWS#L19-L21
+        //
+        if (\version_compare(PHP_VERSION, '5.6.7', '>=') || !\ini_get('open_basedir')) {
+            \readline_read_history();
+        }
+        \readline_clear_history();
+
+        return \readline_read_history($this->historyFile);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function readline($prompt = null)
+    {
+        return \readline($prompt);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function redisplay()
+    {
+        \readline_redisplay();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function writeHistory()
+    {
+        // We have to write history first, since it is used
+        // by Libedit to list history
+        if ($this->historyFile !== false) {
+            $res = \readline_write_history($this->historyFile);
+        } else {
+            $res = true;
+        }
+
+        if (!$res || !$this->eraseDups && !$this->historySize > 0) {
+            return $res;
+        }
+
+        $hist = $this->listHistory();
+        if (!$hist) {
+            return true;
+        }
+
+        if ($this->eraseDups) {
+            // flip-flip technique: removes duplicates, latest entries win.
+            $hist = \array_flip(\array_flip($hist));
+            // sort on keys to get the order back
+            \ksort($hist);
+        }
+
+        if ($this->historySize > 0) {
+            $histsize = \count($hist);
+            if ($histsize > $this->historySize) {
+                $hist = \array_slice($hist, $histsize - $this->historySize);
+            }
+        }
+
+        \readline_clear_history();
+        foreach ($hist as $line) {
+            \readline_add_history($line);
+        }
+
+        if ($this->historyFile !== false) {
+            return \readline_write_history($this->historyFile);
+        }
+
+        return true;
+    }
+}

vendor/psy/psysh/src/Readline/HoaConsole.php

@@ -0,0 +1,107 @@
+<?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\Readline;
+
+use Hoa\Console\Readline\Readline as HoaReadline;
+use Psy\Exception\BreakException;
+
+/**
+ * Hoa\Console Readline implementation.
+ */
+class HoaConsole implements Readline
+{
+    /** @var HoaReadline */
+    private $hoaReadline;
+
+    /**
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return \class_exists('\Hoa\Console\Console', true);
+    }
+
+    public function __construct()
+    {
+        $this->hoaReadline = new HoaReadline();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addHistory($line)
+    {
+        $this->hoaReadline->addHistory($line);
+
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function clearHistory()
+    {
+        $this->hoaReadline->clearHistory();
+
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function listHistory()
+    {
+        $i = 0;
+        $list = [];
+        while (($item = $this->hoaReadline->getHistory($i++)) !== null) {
+            $list[] = $item;
+        }
+
+        return $list;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function readHistory()
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws BreakException if user hits Ctrl+D
+     *
+     * @return string
+     */
+    public function readline($prompt = null)
+    {
+        return $this->hoaReadline->readLine($prompt);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function redisplay()
+    {
+        // noop
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function writeHistory()
+    {
+        return true;
+    }
+}

vendor/psy/psysh/src/Readline/Libedit.php

@@ -0,0 +1,83 @@
+<?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\Readline;
+
+use Psy\Util\Str;
+
+/**
+ * A Libedit-based Readline implementation.
+ *
+ * This is largely the same as the Readline implementation, but it emulates
+ * support for `readline_list_history` since PHP decided it was a good idea to
+ * ship a fake Readline implementation that is missing history support.
+ */
+class Libedit extends GNUReadline
+{
+    /**
+     * Let's emulate GNU Readline by manually reading and parsing the history file!
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return \function_exists('readline') && !\function_exists('readline_list_history');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function listHistory()
+    {
+        $history = \file_get_contents($this->historyFile);
+        if (!$history) {
+            return [];
+        }
+
+        // libedit doesn't seem to support non-unix line separators.
+        $history = \explode("\n", $history);
+
+        // shift the history signature, ensure it's valid
+        if (\array_shift($history) !== '_HiStOrY_V2_') {
+            return [];
+        }
+
+        // decode the line
+        $history = \array_map([$this, 'parseHistoryLine'], $history);
+        // filter empty lines & comments
+        return \array_values(\array_filter($history));
+    }
+
+    /**
+     * From GNUReadline (readline/histfile.c & readline/histexpand.c):
+     * lines starting with "\0" are comments or timestamps;
+     * if "\0" is found in an entry,
+     * everything from it until the next line is a comment.
+     *
+     * @param string $line The history line to parse
+     *
+     * @return string | null
+     */
+    protected function parseHistoryLine($line)
+    {
+        // empty line, comment or timestamp
+        if (!$line || $line[0] === "\0") {
+            return;
+        }
+        // if "\0" is found in an entry, then
+        // everything from it until the end of line is a comment.
+        if (($pos = \strpos($line, "\0")) !== false) {
+            $line = \substr($line, 0, $pos);
+        }
+
+        return ($line !== '') ? Str::unvis($line) : null;
+    }
+}

vendor/psy/psysh/src/Readline/Readline.php

@@ -0,0 +1,76 @@
+<?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\Readline;
+
+/**
+ * An interface abstracting the various readline_* functions.
+ */
+interface Readline
+{
+    /**
+     * Check whether this Readline class is supported by the current system.
+     *
+     * @return bool
+     */
+    public static function isSupported();
+
+    /**
+     * Add a line to the command history.
+     *
+     * @param string $line
+     *
+     * @return bool Success
+     */
+    public function addHistory($line);
+
+    /**
+     * Clear the command history.
+     *
+     * @return bool Success
+     */
+    public function clearHistory();
+
+    /**
+     * List the command history.
+     *
+     * @return array
+     */
+    public function listHistory();
+
+    /**
+     * Read the command history.
+     *
+     * @return bool Success
+     */
+    public function readHistory();
+
+    /**
+     * Read a single line of input from the user.
+     *
+     * @param null|string $prompt
+     *
+     * @return false|string
+     */
+    public function readline($prompt = null);
+
+    /**
+     * Redraw readline to redraw the display.
+     */
+    public function redisplay();
+
+    /**
+     * Write the command history to a file.
+     *
+     * @return bool Success
+     */
+    public function writeHistory();
+}

vendor/psy/psysh/src/Readline/Transient.php

@@ -0,0 +1,147 @@
+<?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\Readline;
+
+use Psy\Exception\BreakException;
+
+/**
+ * An array-based Readline emulation implementation.
+ */
+class Transient implements Readline
+{
+    private $history;
+    private $historySize;
+    private $eraseDups;
+    private $stdin;
+
+    /**
+     * Transient Readline is always supported.
+     *
+     * {@inheritdoc}
+     */
+    public static function isSupported()
+    {
+        return true;
+    }
+
+    /**
+     * Transient Readline constructor.
+     */
+    public function __construct($historyFile = null, $historySize = 0, $eraseDups = false)
+    {
+        // don't do anything with the history file...
+        $this->history     = [];
+        $this->historySize = $historySize;
+        $this->eraseDups   = $eraseDups;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addHistory($line)
+    {
+        if ($this->eraseDups) {
+            if (($key = \array_search($line, $this->history)) !== false) {
+                unset($this->history[$key]);
+            }
+        }
+
+        $this->history[] = $line;
+
+        if ($this->historySize > 0) {
+            $histsize = \count($this->history);
+            if ($histsize > $this->historySize) {
+                $this->history = \array_slice($this->history, $histsize - $this->historySize);
+            }
+        }
+
+        $this->history = \array_values($this->history);
+
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function clearHistory()
+    {
+        $this->history = [];
+
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function listHistory()
+    {
+        return $this->history;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function readHistory()
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws BreakException if user hits Ctrl+D
+     *
+     * @return string
+     */
+    public function readline($prompt = null)
+    {
+        echo $prompt;
+
+        return \rtrim(\fgets($this->getStdin()), "\n\r");
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function redisplay()
+    {
+        // noop
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function writeHistory()
+    {
+        return true;
+    }
+
+    /**
+     * Get a STDIN file handle.
+     *
+     * @throws BreakException if user hits Ctrl+D
+     *
+     * @return resource
+     */
+    private function getStdin()
+    {
+        if (!isset($this->stdin)) {
+            $this->stdin = \fopen('php://stdin', 'r');
+        }
+
+        if (\feof($this->stdin)) {
+            throw new BreakException('Ctrl+D');
+        }
+
+        return $this->stdin;
+    }
+}

vendor/psy/psysh/src/Reflection/ReflectionClassConstant.php

@@ -0,0 +1,228 @@
+<?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\Reflection;
+
+/**
+ * Somehow the standard reflection library didn't include class constants until 7.1.
+ *
+ * ReflectionClassConstant corrects that omission.
+ */
+class ReflectionClassConstant implements \Reflector
+{
+    public $class;
+    public $name;
+    private $value;
+
+    /**
+     * Construct a ReflectionClassConstant object.
+     *
+     * @param string|object $class
+     * @param string        $name
+     */
+    public function __construct($class, $name)
+    {
+        if (!$class instanceof \ReflectionClass) {
+            $class = new \ReflectionClass($class);
+        }
+
+        $this->class = $class;
+        $this->name  = $name;
+
+        $constants = $class->getConstants();
+        if (!\array_key_exists($name, $constants)) {
+            throw new \InvalidArgumentException('Unknown constant: ' . $name);
+        }
+
+        $this->value = $constants[$name];
+    }
+
+    /**
+     * Exports a reflection.
+     *
+     * @param string|object $class
+     * @param string        $name
+     * @param bool          $return pass true to return the export, as opposed to emitting it
+     *
+     * @return null|string
+     */
+    public static function export($class, $name, $return = false)
+    {
+        $refl = new self($class, $name);
+        $value = $refl->getValue();
+
+        $str = \sprintf('Constant [ public %s %s ] { %s }', \gettype($value), $refl->getName(), $value);
+
+        if ($return) {
+            return $str;
+        }
+
+        echo $str . "\n";
+    }
+
+    /**
+     * Gets the declaring class.
+     *
+     * @return \ReflectionClass
+     */
+    public function getDeclaringClass()
+    {
+        $parent = $this->class;
+
+        // Since we don't have real reflection constants, we can't see where
+        // it's actually defined. Let's check for a constant that is also
+        // available on the parent class which has exactly the same value.
+        //
+        // While this isn't _technically_ correct, it's prolly close enough.
+        do {
+            $class  = $parent;
+            $parent = $class->getParentClass();
+        } while ($parent && $parent->hasConstant($this->name) && $parent->getConstant($this->name) === $this->value);
+
+        return $class;
+    }
+
+    /**
+     * Get the constant's docblock.
+     *
+     * @return false
+     */
+    public function getDocComment()
+    {
+        return false;
+    }
+
+    /**
+     * Gets the class constant modifiers.
+     *
+     * Since this is only used for PHP < 7.1, we can just return "public". All
+     * the fancier modifiers are only available on PHP versions which have their
+     * own ReflectionClassConstant class :)
+     *
+     * @return int
+     */
+    public function getModifiers()
+    {
+        return \ReflectionMethod::IS_PUBLIC;
+    }
+
+    /**
+     * Gets the constant name.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Gets the value of the constant.
+     *
+     * @return mixed
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * Checks if class constant is private.
+     *
+     * @return bool false
+     */
+    public function isPrivate()
+    {
+        return false;
+    }
+
+    /**
+     * Checks if class constant is protected.
+     *
+     * @return bool false
+     */
+    public function isProtected()
+    {
+        return false;
+    }
+
+    /**
+     * Checks if class constant is public.
+     *
+     * @return bool true
+     */
+    public function isPublic()
+    {
+        return true;
+    }
+
+    /**
+     * To string.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->getName();
+    }
+
+    /**
+     * Gets the constant's file name.
+     *
+     * Currently returns null, because if it returns a file name the signature
+     * formatter will barf.
+     */
+    public function getFileName()
+    {
+        return;
+        // return $this->class->getFileName();
+    }
+
+    /**
+     * Get the code start line.
+     *
+     * @throws \RuntimeException
+     */
+    public function getStartLine()
+    {
+        throw new \RuntimeException('Not yet implemented because it\'s unclear what I should do here :)');
+    }
+
+    /**
+     * Get the code end line.
+     *
+     * @throws \RuntimeException
+     */
+    public function getEndLine()
+    {
+        return $this->getStartLine();
+    }
+
+    /**
+     * Get a ReflectionClassConstant instance.
+     *
+     * In PHP >= 7.1, this will return a \ReflectionClassConstant from the
+     * standard reflection library. For older PHP, it will return this polyfill.
+     *
+     * @param string|object $class
+     * @param string        $name
+     *
+     * @return ReflectionClassConstant|\ReflectionClassConstant
+     */
+    public static function create($class, $name)
+    {
+        if (\class_exists('\\ReflectionClassConstant')) {
+            return new \ReflectionClassConstant($class, $name);
+        }
+
+        return new self($class, $name);
+    }
+}