--- /dev/null
+<?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\StaticCall;
+use PhpParser\Node\Expr\Variable;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+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>
+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;
+ }
+
+ $expr = $this->parse($code);
+
+ if (count($expr) !== 1) {
+ throw new \InvalidArgumentException('No idea how to throw this');
+ }
+
+ return [new Arg($expr[0])];
+ }
+
+ /**
+ * 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 . ';');
+ }
+ }
+}