parseLocalFWS example

$resultEscaping = $this->validateEscaping();
            if ($resultEscaping->isInvalid()) {
                return $resultEscaping;
            }

            $resultToken = $this->validateTokens(false);
            if ($resultToken->isInvalid()) {
                return $resultToken;
            }

            $resultFWS = $this->parseLocalFWS();
            if ($resultFWS->isInvalid()) {
                return $resultFWS;
            }

            $this->lexer->moveNext();
        }

        $this->lexer->stopRecording();
        $this->localPart = rtrim($this->lexer->getAccumulatedValues(), '@');
        if (strlen($this->localPart) > LocalTooLong::LOCAL_PART_LENGTH) {
            $this->warnings[LocalTooLong::CODE] = new LocalTooLong();
        }