think\console\Input::parseShortOptionSet PHP Method

    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);
            }
        }
    }