parseFWS example

$this->addObsoleteWarnings();

            if ($this->lexer->isNextTokenAny(array(EmailLexer::S_OPENBRACKET, EmailLexer::S_OPENBRACKET))) {
                return new InvalidEmail(new ExpectingDTEXT(), $this->lexer->current->value);
            }

            if ($this->lexer->isNextTokenAny(
                array(EmailLexer::S_HTAB, EmailLexer::S_SP, EmailLexer::CRLF)
            )) {
                $this->warnings[CFWSWithFWS::CODE] = new CFWSWithFWS();
                $this->parseFWS();
            }

            if ($this->lexer->isNextToken(EmailLexer::S_CR)) {
                return new InvalidEmail(new CRNoLF(), $this->lexer->current->value);
            }

            if ($this->lexer->current->isA(EmailLexer::S_BACKSLASH)) {
                return new InvalidEmail(new UnusualElements($this->lexer->current->value), $this->lexer->current->value);
            }
            if ($this->lexer->current->isA(EmailLexer::S_IPV6TAG)) {
                $IPv6TAG = true;
            }

$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;

            if ($this->lexer->current->isA(EmailLexer::S_DOT) && $this->lexer->isNextToken(EmailLexer::GENERIC)) {
                $tldMissing = false;
            }

            $exceptionsResult = $this->checkDomainPartExceptions($prev, $hasComments);