Reset the label when a S_DOT is encountered. (#297)

This will allow multi label domain's to still validate correctly.

Reset the label when a S_DOT is encountered.

src/Parser/DomainPart.php

@@ -280,9 +280,9 @@ class DomainPart extends PartParser
     {
         if ($this->lexer->token['type'] === EmailLexer::S_DOT || $isEndOfDomain) {
             if ($this->isLabelTooLong($this->label)) {
-                $this->label = '';
                 return new InvalidEmail(new LabelTooLong(), $this->lexer->token['value']);
             }
+            $this->label = '';
         }
         $this->label .= $this->lexer->token['value'];
         return new ValidEmail();

src/Validation/EmailValidation.php

@@ -21,7 +21,7 @@ interface EmailValidation
     /**
      * Returns the validation error.
      *
-     * @return InvalidEmail
+     * @return InvalidEmail|null
      */
     public function getError() : ?InvalidEmail;
 

tests/EmailValidator/Validation/RFCValidationDomainPartTest.php

@@ -76,6 +76,7 @@ class RFCValidationDomainPartTest extends TestCase
             ['validipv4@[127.0.0.0]'],
             ['validipv4@127.0.0.0'],
             ['withhyphen@domain-exam.com'],
+            ['valid_long_domain@71846jnrsoj91yfhc18rkbrf90ue3onl8y46js38kae8inz0t1.5a-xdycuau.na49.le.example.com']
         );
     }