class BufferIO

class BufferIO extends ConsoleIO {
    public function __construct(string $input = '', int $verbosity = StreamOutput::VERBOSITY_NORMAL, ?OutputFormatterInterface $formatter = null) {
        $input = new StringInput($input);
        $input->setInteractive(false);
        $stream = fopen('php://memory', 'rw');
        if ($stream === false) {
            throw new \RuntimeException('Unable to open memory output stream');
        }
        $output = new StreamOutput($stream, $verbosity, $formatter !== null ? $formatter->isDecorated() : false, $formatter);
        parent::__construct($input, $output, new HelperSet([
            new QuestionHelper(),
        ]));
    }
    
    /**
     * @return string output
     */
    public function getOutput() : string {
        assert($this->output instanceof StreamOutput);
        fseek($this->output
            ->getStream(), 0);
        $output = (string) stream_get_contents($this->output
            ->getStream());
        $output = Preg::replaceCallback("{(?<=^|\n|\x08)(.+?)(\x08+)}", static function ($matches) : string {
            $pre = strip_tags($matches[1]);
            if (strlen($pre) === strlen($matches[2])) {
                return '';
            }
            // TODO reverse parse the string, skipping span tags and \033\[([0-9;]+)m(.*?)\033\[0m style blobs
            return rtrim($matches[1]) . "\n";
        }, $output);
        return $output;
    }
    
    /**
     * @param string[] $inputs
     *
     * @see createStream
     */
    public function setUserInputs(array $inputs) : void {
        if (!$this->input instanceof StreamableInputInterface) {
            throw new \RuntimeException('Setting the user inputs requires at least the version 3.2 of the symfony/console component.');
        }
        $this->input
            ->setStream($this->createStream($inputs));
        $this->input
            ->setInteractive(true);
    }
    
    /**
     * @param string[] $inputs
     *
     * @return resource stream
     */
    private function createStream(array $inputs) {
        $stream = fopen('php://memory', 'r+');
        if ($stream === false) {
            throw new \RuntimeException('Unable to open memory output stream');
        }
        foreach ($inputs as $input) {
            fwrite($stream, $input . PHP_EOL);
        }
        rewind($stream);
        return $stream;
    }

}