public function getInput()
    {
        $this->codeBufferOpen = false;

        do {
            // reset output verbosity (in case it was altered by a subcommand)
            $this->output->setVerbosity(ShellOutput::VERBOSITY_VERBOSE);

            $input = $this->readline();

            /*
             * Handle Ctrl+D. It behaves differently in different cases:
             *
             *   1) In an expression, like a function or "if" block, clear the input buffer
             *   2) At top-level session, behave like the exit command
             */
            if ($input === false) {
                $this->output->writeln('');

                if ($this->hasCode()) {
                    $this->resetCodeBuffer();
                } else {
                    throw new BreakException('Ctrl+D');
                }
            }

            // handle empty input
            if (\trim($input) === '' && !$this->codeBufferOpen) {
                continue;
            }

            $input = $this->onInput($input);

            // If the input isn't in an open string or comment, check for commands to run.
            if ($this->hasCommand($input) && !$this->inputInOpenStringOrComment($input)) {
                $this->addHistory($input);
                $this->runCommand($input);

                continue;
            }

            $this->addCode($input);
        } while (!$this->hasValidCode());
    }