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#include <iomanip>
#include <iostream>
#include <string>
#include <toml.hpp>
#include <nlohmann/json.hpp>
#include <cmath>
#ifdef TOML11_TO_JSON_USE_V1_1_0
# define TOML11_TO_JSON_SPEC toml::spec::v(1, 1, 0)
#else
# define TOML11_TO_JSON_SPEC toml::spec::v(1, 0, 0)
#endif
template<typename Value = toml::value>
struct json_converter
{
using value_type = Value;
using boolean_type = typename value_type::boolean_type ;
using integer_type = typename value_type::integer_type ;
using floating_type = typename value_type::floating_type ;
using string_type = typename value_type::string_type ;
using local_time_type = typename value_type::local_time_type ;
using local_date_type = typename value_type::local_date_type ;
using local_datetime_type = typename value_type::local_datetime_type ;
using offset_datetime_type = typename value_type::offset_datetime_type;
using array_type = typename value_type::array_type ;
using table_type = typename value_type::table_type ;
nlohmann::json operator()(boolean_type v)
{
nlohmann::json j;
j["type"] = "bool";
if(v)
{
j["value"] = "true";
}
else
{
j["value"] = "false";
}
return j;
}
nlohmann::json operator()(integer_type v)
{
nlohmann::json j;
j["type"] = "integer";
j["value"] = std::to_string(v);
return j;
}
nlohmann::json operator()(floating_type v)
{
std::ostringstream oss;
oss << std::setprecision(16);
// if we set the precision as max_digit, 1.1 will be 1.1000000000000001.
// But toml-test does not allow 1.1000000000000001.
if(std::isnan(v) && std::signbit(v))
{
// toml-test does not allow negative NaN represented in "-nan" because
// there are languages that does not distinguish nan and -nan.
// But toml11 keeps sign from input. To resolve this difference,
// we convert -nan to nan here.
v = std::numeric_limits<floating_type>::quiet_NaN();
}
oss << v;
nlohmann::json j;
j["type"] = "float";
j["value"] = oss.str();
return j;
}
nlohmann::json operator()(const string_type& v)
{
nlohmann::json j;
j["type"] = "string";
j["value"] = v;
return j;
}
nlohmann::json operator()(const toml::local_time& v)
{
nlohmann::json j;
j["type"] = "time-local";
j["value"] = toml::to_string(v);
return j;
}
nlohmann::json operator()(const toml::local_date& v)
{
nlohmann::json j;
j["type"] = "date-local";
j["value"] = toml::to_string(v);
return j;
}
nlohmann::json operator()(const toml::local_datetime& v)
{
nlohmann::json j;
j["type"] = "datetime-local";
j["value"] = toml::to_string(v);
return j;
}
nlohmann::json operator()(const toml::offset_datetime& v)
{
nlohmann::json j;
j["type"] = "datetime";
j["value"] = toml::to_string(v);
return j;
}
nlohmann::json operator()(const toml::array& v)
{
nlohmann::json j = nlohmann::json::array();
for(const auto& elem : v)
{
j.push_back(toml::visit(*this, elem));
}
return j;
}
nlohmann::json operator()(const toml::table& v)
{
nlohmann::json j = nlohmann::json::object();
for(const auto& kv : v)
{
j[kv.first] = toml::visit(*this, kv.second);
}
return j;
}
};
int main(int argc, char** argv)
{
try
{
if(argc == 2)
{
const std::string fname(argv[1]);
const auto data = toml::parse(fname, TOML11_TO_JSON_SPEC);
std::cout << toml::visit(json_converter<>(), data);
return 0;
}
else
{
std::vector<unsigned char> buf;
std::cin.peek();
while(!std::cin.eof())
{
buf.push_back(static_cast<unsigned char>(std::cin.get()));
std::cin.peek();
}
const auto data = toml::parse(buf, "cin", TOML11_TO_JSON_SPEC);
std::cout << toml::visit(json_converter<>(), data);
return 0;
}
}
catch(const std::exception& err)
{
std::cout << "what(): " << err.what() << std::endl;
return 1;
}
}
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