private function findStart(Tokens $tokens, $index)
    {
        do {
            $index = $tokens->getPrevMeaningfulToken($index);
            $token = $tokens[$index];

            $blockType = Tokens::detectBlockType($token);
            if (null !== $blockType && !$blockType['isStart']) {
                $index = $tokens->findBlockStart($blockType['type'], $index);
                $token = $tokens[$index];
            }
        } while (!$token->equalsAny(['$', [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_STATIC, T_STRING])) {
                return $this->findStart($tokens, $prevIndex);
            }

            $index = $tokens->getTokenNotOfKindSibling($prevIndex, -1, [[T_NS_SEPARATOR], [T_STATIC], [T_STRING]]);
            $index = $tokens->getNextMeaningfulToken($index);
        }

        return $index;
    }
private function findStart(Tokens $tokens, $index)
    {
        do {
            $index = $tokens->getPrevMeaningfulToken($index);
            $token = $tokens[$index];

            $blockType = Tokens::detectBlockType($token);
            if (null !== $blockType && !$blockType['isStart']) {
                $index = $tokens->findBlockStart($blockType['type'], $index);
                $token = $tokens[$index];
            }
        } while (!$token->equalsAny(['$', [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_STATIC, T_STRING])) {
                return $this->findStart($tokens, $prevIndex);
            }

            $index = $tokens->getTokenNotOfKindSibling($prevIndex, -1, [[T_NS_SEPARATOR], [T_STATIC], [T_STRING]]);
            $index = $tokens->getNextMeaningfulToken($index);
        }

        return $index;
    }
@param Tokens $tokens
@param int    $index

@return int