validateTokens example

if ($this->lexer->current->isA(EmailLexer::S_HYPHEN) && $this->lexer->isNextToken(EmailLexer::S_DOT)) {
            return new InvalidEmail(new DomainHyphened('Hypen found near DOT'), $this->lexer->current->value);
        }

        if (
            $this->lexer->current->isA(EmailLexer::S_BACKSLASH)
            && $this->lexer->isNextToken(EmailLexer::GENERIC)
        ) {
            return new InvalidEmail(new ExpectingATEXT('Escaping following "ATOM"'), $this->lexer->current->value);
        }

        return $this->validateTokens($hasComments);
    }

    protected function validateTokens(bool $hasComments): Result
    {
        $validDomainTokens = array(
            EmailLexer::GENERIC => true,
            EmailLexer::S_HYPHEN => true,
            EmailLexer::S_DOT => true,
        );

        if ($hasComments) {
            

  public function assertValidTokens($context_tokens) {
    if (!is_array($context_tokens)) {
      return FALSE;
    }

    try {
      $this->validateTokens($context_tokens);
    }
    catch (\LogicException $e) {
      return FALSE;
    }

    return TRUE;
  }

}

$this->lexer->current->isA(EmailLexer::S_DOT) &&
                $this->lexer->isNextToken(EmailLexer::S_AT)
            ) {
                return new InvalidEmail(new DotAtEnd(), $this->lexer->current->value);
            }

            $resultEscaping = $this->validateEscaping();
            if ($resultEscaping->isInvalid()) {
                return $resultEscaping;
            }

            $resultToken = $this->validateTokens(false);
            if ($resultToken->isInvalid()) {
                return $resultToken;
            }

            $resultFWS = $this->parseLocalFWS();
            if ($resultFWS->isInvalid()) {
                return $resultFWS;
            }

            $this->lexer->moveNext();
        }

        

  public function testValidateContexts(array $contexts, $expected_exception_message) {
    $container = new ContainerBuilder();
    $cache_contexts_manager = new CacheContextsManager($container, ['foo', 'foo.bar', 'baz']);
    if ($expected_exception_message !== FALSE) {
      $this->expectException('LogicException');
      $this->expectExceptionMessage($expected_exception_message);
    }
    // If it doesn't throw an exception, validateTokens() returns NULL.     $this->assertNull($cache_contexts_manager->validateTokens($contexts));
  }

}

/** * Fake cache context class. */
class FooCacheContext implements CacheContextInterface {

  /** * {@inheritdoc} */