| #include <iostream> |
| #include <iomanip> |
| #include <sstream> |
| #include <nlohmann/json.hpp> |
| |
| using json = nlohmann::json; |
| |
| // a simple event consumer that collects string representations of the passed |
| // values; note inheriting from json::json_sax_t is not required, but can |
| // help not to forget a required function |
| class sax_event_consumer : public json::json_sax_t |
| { |
| public: |
| std::vector<std::string> events; |
| |
| bool null() override |
| { |
| events.push_back("null()"); |
| return true; |
| } |
| |
| bool boolean(bool val) override |
| { |
| events.push_back("boolean(val=" + std::string(val ? "true" : "false") + ")"); |
| return true; |
| } |
| |
| bool number_integer(number_integer_t val) override |
| { |
| events.push_back("number_integer(val=" + std::to_string(val) + ")"); |
| return true; |
| } |
| |
| bool number_unsigned(number_unsigned_t val) override |
| { |
| events.push_back("number_unsigned(val=" + std::to_string(val) + ")"); |
| return true; |
| } |
| |
| bool number_float(number_float_t val, const string_t& s) override |
| { |
| events.push_back("number_float(val=" + std::to_string(val) + ", s=" + s + ")"); |
| return true; |
| } |
| |
| bool string(string_t& val) override |
| { |
| events.push_back("string(val=" + val + ")"); |
| return true; |
| } |
| |
| bool start_object(std::size_t elements) override |
| { |
| events.push_back("start_object(elements=" + std::to_string(elements) + ")"); |
| return true; |
| } |
| |
| bool end_object() override |
| { |
| events.push_back("end_object()"); |
| return true; |
| } |
| |
| bool start_array(std::size_t elements) override |
| { |
| events.push_back("start_array(elements=" + std::to_string(elements) + ")"); |
| return true; |
| } |
| |
| bool end_array() override |
| { |
| events.push_back("end_array()"); |
| return true; |
| } |
| |
| bool key(string_t& val) override |
| { |
| events.push_back("key(val=" + val + ")"); |
| return true; |
| } |
| |
| bool binary(json::binary_t& val) override |
| { |
| events.push_back("binary(val=[...])"); |
| return true; |
| } |
| |
| bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override |
| { |
| events.push_back("parse_error(position=" + std::to_string(position) + ", last_token=" + last_token + ",\n ex=" + std::string(ex.what()) + ")"); |
| return false; |
| } |
| }; |
| |
| int main() |
| { |
| // CBOR byte string |
| std::vector<std::uint8_t> vec = {{0x44, 0xcA, 0xfe, 0xba, 0xbe}}; |
| |
| // create a SAX event consumer object |
| sax_event_consumer sec; |
| |
| // parse CBOR |
| bool result = json::sax_parse(vec, &sec, json::input_format_t::cbor); |
| |
| // output the recorded events |
| for (auto& event : sec.events) |
| { |
| std::cout << event << "\n"; |
| } |
| |
| // output the result of sax_parse |
| std::cout << "\nresult: " << std::boolalpha << result << std::endl; |
| } |