code: protected function applyFix(\SplFileInfo $file, Tokens $tokens)
      {
          $oneSpaceBefore = 'one' === $this->configuration['space_before'];
  
          for ($index = 0, $limit = $tokens->count(); $index < $limit; ++$index) {
              if (!$tokens[$index]->isGivenKind(CT::T_TYPE_COLON)) {
                  continue;
              }
  
              $previousIndex = $index - 1;
              $previousToken = $tokens[$previousIndex];
  
              if ($previousToken->isWhitespace()) {
                  if (!$tokens[$tokens->getPrevNonWhitespace($index - 1)]->isComment()) {
                      if ($oneSpaceBefore) {
                          $tokens[$previousIndex] = new Token([T_WHITESPACE, ' ']);
                      } else {
                          $tokens->clearAt($previousIndex);
                      }
                  }
              } elseif ($oneSpaceBefore) {
                  $tokenWasAdded = $tokens->ensureWhitespaceAtIndex($index, 0, ' ');
  
                  if ($tokenWasAdded) {
                      ++$limit;
                  }
  
                  ++$index;
              }
  
              ++$index;
  
              $tokenWasAdded = $tokens->ensureWhitespaceAtIndex($index, 0, ' ');
  
              if ($tokenWasAdded) {
                  ++$limit;
              }
          }
      }
docs: {@inheritdoc}