class PartParser

abstract class PartParser {
    
    /**
     * @var Warning[]
     */
    protected $warnings = [];
    
    /**
     * @var EmailLexer
     */
    protected $lexer;
    public function __construct(EmailLexer $lexer) {
        $this->lexer = $lexer;
    }
    public abstract function parse() : Result;
    
    /**
     * @return Warning[]
     */
    public function getWarnings() {
        return $this->warnings;
    }
    protected function parseFWS() : Result {
        $foldingWS = new FoldingWhiteSpace($this->lexer);
        $resultFWS = $foldingWS->parse();
        $this->warnings = [
            $this->warnings,
            $foldingWS->getWarnings(),
        ];
        return $resultFWS;
    }
    protected function checkConsecutiveDots() : Result {
        if ($this->lexer->current
            ->isA(EmailLexer::S_DOT) && $this->lexer
            ->isNextToken(EmailLexer::S_DOT)) {
            return new InvalidEmail(new ConsecutiveDot(), $this->lexer->current->value);
        }
        return new ValidEmail();
    }
    protected function escaped() : bool {
        $previous = $this->lexer
            ->getPrevious();
        return $previous->isA(EmailLexer::S_BACKSLASH) && !$this->lexer->current
            ->isA(EmailLexer::GENERIC);
    }

}