Added invalidtaion for backslash in domain literal and test data

src/Parser/DomainLiteral.php

@@ -17,6 +17,7 @@ use Egulias\EmailValidator\Warning\IPV6Deprecated;
 use Egulias\EmailValidator\Warning\IPV6GroupCount;
 use Egulias\EmailValidator\Warning\IPV6DoubleColon;
 use Egulias\EmailValidator\Result\Reason\ExpectingDTEXT;
+use Egulias\EmailValidator\Result\Reason\UnusualElements;
 use Egulias\EmailValidator\Warning\DomainLiteral as WarningDomainLiteral;
 
 class DomainLiteral extends Parser
@@ -51,10 +52,7 @@ class DomainLiteral extends Parser
             }
 
             if ($this->lexer->token['type'] === EmailLexer::S_BACKSLASH) {
-                $this->warnings[ObsoleteDTEXT::CODE] = new ObsoleteDTEXT();
-                $addressLiteral .= $this->lexer->token['value'];
-                $this->lexer->moveNext();
-                $this->validateQuotedPair();
+                return new InvalidEmail(new UnusualElements($this->lexer->token['value']), $this->lexer->token['value']);
             }
             if ($this->lexer->token['type'] === EmailLexer::S_IPV6TAG) {
                 $IPv6TAG = true;
@@ -190,7 +188,8 @@ class DomainLiteral extends Parser
     {
         if ($this->lexer->token['type'] === EmailLexer::INVALID ||
             $this->lexer->token['type'] === EmailLexer::C_DEL   ||
-            $this->lexer->token['type'] === EmailLexer::S_LF
+            $this->lexer->token['type'] === EmailLexer::S_LF ||
+            $this->lexer->token['type'] === EmailLexer::S_BACKSLASH
         ) {
             $this->warnings[ObsoleteDTEXT::CODE] = new ObsoleteDTEXT();
         }

src/Result/Reason/ExceptionFound.php

@@ -4,6 +4,16 @@ namespace Egulias\EmailValidator\Result\Reason;
 
 class ExceptionFound implements Reason
 {
+    /**
+     * @var \Exception
+     */
+    private $exception;
+
+    public function __construct(\Exception $exception)
+    {
+        $this->exception = $exception;
+        
+    }
     public function code() : int
     {
         return 999;
@@ -11,6 +21,6 @@ class ExceptionFound implements Reason
 
     public function description() : string
     {
-        return 'An exception occurred during the execution';
+        return $this->exception->getMessage();
     }
 }

src/Result/Reason/UnusualElements.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Egulias\EmailValidator\Result\Reason;
+
+class UnusualElements implements Reason
+{
+    /**
+     * @var string $element
+     */
+    private $element = '';
+
+    public function __construct(string $element)
+    {
+        $this->element = $element;
+    }
+
+    public function code() : int
+    {
+        return 201;
+    }
+
+    public function description() : string
+    {
+        return 'Unusual element found, wourld render invalid in majority of cases. Element found: ' . $this->element;
+    }
+}

src/Validation/RFCValidation.php

@@ -35,7 +35,7 @@ class RFCValidation implements EmailValidation
                 return false;
             }
         } catch (\Exception $invalid) {
-            $this->error = new InvalidEmail(new ExceptionFound(), '');
+            $this->error = new InvalidEmail(new ExceptionFound($invalid), '');
             return false;
         }
 

tests/EmailValidator/Validation/RFCValidationTest.php

@@ -101,6 +101,9 @@ class RFCValidationTest extends TestCase
             ['test@email%'],
             ['test@email$'],
             ["1500111@профи-инвест.рф"],
+            ['validipv6@[IPv6:2001:db8:1ff::a0b:dbd0]'],
+            ['validipv4@[127.0.0.0]'],
+            ['validipv4@127.0.0.0'],
         );
     }
 
@@ -170,6 +173,7 @@ class RFCValidationTest extends TestCase
             ['test@email{'],
             ['username@examp,le.com'],
             ['test@ '],
+            ['validipv4@[127.\0.0.0]'],
         ];
     }