processIDLeft example

protected function preLeftParsing(): Result
    {
        if (!$this->hasAtToken()) {
            return new InvalidEmail(new NoLocalPart(), $this->lexer->current->value);
        }
        return new ValidEmail();
    }

    protected function parseLeftFromAt(): Result
    {
        return $this->processIDLeft();
    }

    protected function parseRightFromAt(): Result
    {
        return $this->processIDRight();
    }

    private function processIDLeft(): Result
    {
        $localPartParser = new IDLeftPart($this->lexer);
        $localPartResult = $localPartParser->parse();