public function get($name)
    {
        switch ($name) {
            case '_':
                return $this->returnValue;

            case '_e':
                if (isset($this->lastException)) {
                    return $this->lastException;
                }
                break;

            case '__out':
                if (isset($this->lastStdout)) {
                    return $this->lastStdout;
                }
                break;

            case 'this':
                if (isset($this->boundObject)) {
                    return $this->boundObject;
                }
                break;

            case '__function':
            case '__method':
            case '__class':
            case '__namespace':
            case '__file':
            case '__line':
            case '__dir':
                if (\array_key_exists($name, $this->commandScopeVariables)) {
                    return $this->commandScopeVariables[$name];
                }
                break;

            default:
                if (\array_key_exists($name, $this->scopeVariables)) {
                    return $this->scopeVariables[$name];
                }
                break;
        }

        throw new \InvalidArgumentException('Unknown variable: $' . $name);
    }