checkLabelLength example

if ($dotsResult->isInvalid()) {
                return $dotsResult;
            }

            if ($this->lexer->current->isA(EmailLexer::S_OPENBRACKET)) {
                $literalResult = $this->parseDomainLiteral();

                $this->addTLDWarnings($tldMissing);
                return $literalResult;
            }

            $labelCheck = $this->checkLabelLength();
            if ($labelCheck->isInvalid()) {
                return $labelCheck;
            }

            $FwsResult = $this->parseFWS();
            if ($FwsResult->isInvalid()) {
                return $FwsResult;
            }

            $domain .= $this->lexer->current->value;