Method GetPrevToken

LuaParser/src/Ast/LuaSyntaxTree.cpp:332–353

}

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

    if (index < _nodeOrTokens.size()) {
        auto &n = _nodeOrTokens[index];
        if (n.Type == NodeOrTokenType::Token) {
            auto tokenIndex = n.Data.TokenIndex;
            if (tokenIndex != 0) {
                return _tokens[tokenIndex - 1].NodeIndex;
            }
        } else {// Node, 可能存在无元素节点
            for (auto nodeIndex = index - 1; nodeIndex > 0; nodeIndex--) {
                if (IsToken(nodeIndex)) {
                    return nodeIndex;
                }
            }
        }
    }
    return 0;
}

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