json/docs/examples/sax_parse__binary.cpp
Niels Lohmann 6a7392058e
Complete documentation for 3.11.0 (#3464)
* 👥 update contributor and sponsor list

* 🚧 document BJData format

* 🚧 document BJData format

* 📝 clarified documentation of [json.exception.parse_error.112]

* ✏️ adjust titles

* 📝 add more examples

* 🚨 adjust warnings for index.md files

* 📝 add more examples

* 🔥 remove example for deprecated code

* 📝 add missing enum entry

* 📝 overwork table for binary formats

*  add test to create table for binary formats

* 📝 fix wording in example

* 📝 add more examples

* Update iterators.md (#3481)

*  add check for overloads to linter #3455

* 👥 update contributor list

* 📝 add more examples

* 📝 fix documentation

* 📝 add more examples

* 🎨 fix indentation

* 🔥 remove example for destructor

* 📝 overwork documentation

* Updated BJData documentation, #3464 (#3493)

* update bjdata.md for #3464

* Minor edit

* Fix URL typo

* Add info on demoting ND array to a 1-D optimized array when singleton dimension

Co-authored-by: Chaoqi Zhang <prncoprs@163.com>
Co-authored-by: Qianqian Fang <fangqq@gmail.com>
2022-05-17 13:08:56 +02:00

115 lines
2.9 KiB
C++

#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;
}