yaml string type not reserved & empty array and map not reserved

[SplitGemini]

yaml string type not reserved

Types of numeric strings in yaml will be erased after conversion.

number_string: "123456"

after convertion:

{
	"number_string": 123456
}

empty array and map not reserved

empty_array: []

after convertion:

{
	"empty_array": null
}

[SplitGemini]

yaml string type not reserved

fix by modify function at tojson.hpp#L75

inline nlohmann::json parse_scalar(const YAML::Node &node) {
    int         i;
    double      d;
    bool        b;
    std::string s;

    // string tag will be !
    if (node.Tag() != "!") {
        if (YAML::convert<int>::decode(node, i))
            return i;
        if (YAML::convert<double>::decode(node, d))
            return d;
        if (YAML::convert<bool>::decode(node, b))
            return b;
    }
    if (YAML::convert<std::string>::decode(node, s))
        return s;

    return nullptr;
}

empty array and map not reserved

fix by modify function at tojson.hpp#L90

inline nlohmann::json yaml2json(const YAML::Node &root) {
    nlohmann::json j{};

    switch (root.Type()) {
        case YAML::NodeType::Null:
            break;
        case YAML::NodeType::Scalar:
            return parse_scalar(root);
        case YAML::NodeType::Sequence:
            j = nlohmann::json::array();
            for (auto &&node : root)
                j.emplace_back(yaml2json(node));
            break;
        case YAML::NodeType::Map:
            j = nlohmann::json::object();
            for (auto &&it : root)
                j[it.first.as<std::string>()] = yaml2json(it.second);
            break;
        default:
            break;
    }
    return j;
}

[mircodz]

Feel free to open a PR request, we can get this fix merged.