PhpCsFixer\Fixer\ClassNotation\MethodSeparationFixer::correctLineBreaks PHP Method

    private function correctLineBreaks(Tokens $tokens, $startIndex, $endIndex, $reqLineCount = 2)
    {
        $lineEnding = $this->whitespacesConfig->getLineEnding();
        ++$startIndex;
        $numbOfWhiteTokens = $endIndex - $startIndex;
        if (0 === $numbOfWhiteTokens) {
            $tokens->insertAt($startIndex, new Token(array(T_WHITESPACE, str_repeat($lineEnding, $reqLineCount))));
            return;
        }
        $lineBreakCount = $this->getLineBreakCount($tokens, $startIndex, $endIndex);
        if ($reqLineCount === $lineBreakCount) {
            return;
        }
        if ($lineBreakCount < $reqLineCount) {
            $tokens[$startIndex]->setContent(str_repeat($lineEnding, $reqLineCount - $lineBreakCount) . $tokens[$startIndex]->getContent());
            return;
        }
        // $lineCount = > $reqLineCount : check the one Token case first since this one will be true most of the time
        if (1 === $numbOfWhiteTokens) {
            $tokens[$startIndex]->setContent(preg_replace('/\\r\\n|\\n/', '', $tokens[$startIndex]->getContent(), $lineBreakCount - $reqLineCount));
            return;
        }
        // $numbOfWhiteTokens = > 1
        $toReplaceCount = $lineBreakCount - $reqLineCount;
        for ($i = $startIndex; $i < $endIndex && $toReplaceCount > 0; ++$i) {
            $tokenLineCount = substr_count($tokens[$i]->getContent(), "\n");
            if ($tokenLineCount > 0) {
                $tokens[$i]->setContent(preg_replace('/\\r\\n|\\n/', '', $tokens[$i]->getContent(), min($toReplaceCount, $tokenLineCount)));
                $toReplaceCount -= $tokenLineCount;
            }
        }
    }