code: private function fixClassyDefinitionExtends(Tokens $tokens, $classOpenIndex, array $classExtendsInfo)
      {
          $endIndex = $tokens->getPrevNonWhitespace($classOpenIndex);
  
          if ($this->configuration['single_line'] || false === $classExtendsInfo['multiLine']) {
              $this->makeClassyDefinitionSingleLine($tokens, $classExtendsInfo['start'], $endIndex);
              $classExtendsInfo['multiLine'] = false;
          } elseif ($this->configuration['single_item_single_line'] && 1 === $classExtendsInfo['numberOfExtends']) {
              $this->makeClassyDefinitionSingleLine($tokens, $classExtendsInfo['start'], $endIndex);
              $classExtendsInfo['multiLine'] = false;
          } elseif ($this->configuration['multi_line_extends_each_single_line'] && $classExtendsInfo['multiLine']) {
              $this->makeClassyInheritancePartMultiLine($tokens, $classExtendsInfo['start'], $endIndex);
              $classExtendsInfo['multiLine'] = true;
          }
  
          return $classExtendsInfo;
      }
docs: @param Tokens $tokens
  @param int    $classOpenIndex
  @param array  $classExtendsInfo
  
  @return array