query_parse.cpp

// Parses a url query (key=val&key_2=val_2&key_3=val_3) into a map

std::map<std::string, std::string> query_to_map(const std::string query) {
    std::map<std::string, std::string> res;
    std::ostringstream curr_key;
    std::ostringstream curr_val;
    bool in_key = true;
    for(const auto& s : query) {
        if(s == '=') {
            in_key = false;
        } else if (s == '&') {
            in_key = true;
            res[curr_key.str()] = curr_val.str();
            curr_key.str("");
            curr_val.str("");
            curr_key.clear();
            curr_val.clear();
        } else {
            if(in_key) {
                curr_key << s;
            } else {
                curr_val << s;
            }
        }
    }
    res[curr_key.str()] = curr_val.str();
    return res;
}