PhpCsFixer\Fixer\Operator\PreIncrementFixer::findStart PHP Method

    private function findStart(Tokens $tokens, $index)
    {
        do {
            $index = $tokens->getPrevMeaningfulToken($index);
            $token = $tokens[$index];
            $blockType = Tokens::detectBlockType($token);
            if (null !== $blockType && !$blockType['isStart']) {
                $index = $tokens->findBlockEnd($blockType['type'], $index, false);
                $token = $tokens[$index];
            }
        } while (!$token->equalsAny(array('$', array(T_VARIABLE))));
        $prevIndex = $tokens->getPrevMeaningfulToken($index);
        $prevToken = $tokens[$prevIndex];
        if ($prevToken->equals('$')) {
            $index = $prevIndex;
            $prevIndex = $tokens->getPrevMeaningfulToken($index);
            $prevToken = $tokens[$prevIndex];
        }
        if ($prevToken->isGivenKind(T_OBJECT_OPERATOR)) {
            return $this->findStart($tokens, $prevIndex);
        }
        if ($prevToken->isGivenKind(T_PAAMAYIM_NEKUDOTAYIM)) {
            $prevPrevIndex = $tokens->getPrevMeaningfulToken($prevIndex);
            if (!$tokens[$prevPrevIndex]->isGivenKind(T_STRING)) {
                return $this->findStart($tokens, $prevIndex);
            }
            $index = $tokens->getTokenNotOfKindSibling($prevIndex, -1, array(array(T_NS_SEPARATOR), array(T_STRING)));
            $index = $tokens->getNextMeaningfulToken($index);
        }
        return $index;
    }