Method GetNextToken

LuaParser/src/Ast/LuaSyntaxTree.cpp:355–388

}

std::size_t LuaSyntaxTree::GetNextToken(std::size_t index) const {
    if (index == 0) {
        return 0;
    }

    std::size_t tokenNodeIndex = 0;
    if (index < _nodeOrTokens.size()) {
        auto &n = _nodeOrTokens[index];
        if (n.Type == NodeOrTokenType::Token) {
            tokenNodeIndex = index;
        } else {// Node, 可能存在无元素节点
            auto lastTokenIndex = GetLastToken(index);
            if (lastTokenIndex != 0) {
                tokenNodeIndex = lastTokenIndex;
            } else {
                // 当前节点是空节点, 则向前查找, 查找前一个token, 就可以轻松得到下一个token
                for (auto nodeIndex = index - 1; nodeIndex > 0; nodeIndex--) {
                    if (IsToken(nodeIndex)) {
                        tokenNodeIndex = nodeIndex;
                        break;
                    }
                }
            }
        }
    }

    if (tokenNodeIndex != 0) {
        auto &token = _nodeOrTokens[tokenNodeIndex];
        if (token.Data.TokenIndex + 1 < _tokens.size()) {
            return _tokens[token.Data.TokenIndex + 1].NodeIndex;
        }
    }
    return 0;
}

std::size_t LuaSyntaxTree::GetParent(std::size_t index) const {
    if (index < _nodeOrTokens.size()) {