src/Viserio/Component/Console/Command/ExpressionParser.php
private static function parseArgument(string $token): InputArgument
    {
        [$token, $description] = static::extractDescription($token);

        switch (true) {
            case self::endsWith($token, '=*]'):
                return new InputArgument(\trim($token, '[=*]'), InputArgument::IS_ARRAY, $description);
            case self::endsWith($token, '=*'):
                return new InputArgument(\trim($token, '=*'), InputArgument::IS_ARRAY | InputArgument::REQUIRED, $description);
            case \preg_match('/(.*)\?$/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::OPTIONAL, $description);
            case \preg_match('/\[(.+)\?\]/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::OPTIONAL, $description);
            case \preg_match('/\[(.+)\=\*(.+)\]/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::IS_ARRAY, $description, \preg_split('/,\s?/', $matches[2]));
            case \preg_match('/\[(.+)\=(.+)\]/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::OPTIONAL, $description, $matches[2]);
            case self::startsWith($token, '[') && self::endsWith($token, ']'):
                return new InputArgument(\trim($token, '[]'), InputArgument::OPTIONAL, $description);

            default:
                return new InputArgument($token, InputArgument::REQUIRED, $description);
        }
    }
private static function parseArgument(string $token): InputArgument
    {
        [$token, $description] = static::extractDescription($token);

        switch (true) {
            case self::endsWith($token, '=*]'):
                return new InputArgument(\trim($token, '[=*]'), InputArgument::IS_ARRAY, $description);
            case self::endsWith($token, '=*'):
                return new InputArgument(\trim($token, '=*'), InputArgument::IS_ARRAY | InputArgument::REQUIRED, $description);
            case \preg_match('/(.*)\?$/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::OPTIONAL, $description);
            case \preg_match('/\[(.+)\?\]/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::OPTIONAL, $description);
            case \preg_match('/\[(.+)\=\*(.+)\]/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::IS_ARRAY, $description, \preg_split('/,\s?/', $matches[2]));
            case \preg_match('/\[(.+)\=(.+)\]/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::OPTIONAL, $description, $matches[2]);
            case self::startsWith($token, '[') && self::endsWith($token, ']'):
                return new InputArgument(\trim($token, '[]'), InputArgument::OPTIONAL, $description);

            default:
                return new InputArgument($token, InputArgument::REQUIRED, $description);
        }
    }
Parse arguments.

@param string $token

@throws \Symfony\Component\Console\Exception\InvalidArgumentException

@return \Viserio\Component\Console\Input\InputArgument