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/***************************************************************************
* Copyright (c) 2019, Martin Renou *
* *
* Distributed under the terms of the BSD 3-Clause License. *
* *
* The full license is in the file LICENSE, distributed with this software. *
****************************************************************************/
#ifndef PYBIND11_JSON_HPP
#define PYBIND11_JSON_HPP
#include <set>
#include <string>
#include <vector>
#include "nlohmann/json.hpp"
#include "pybind11/pybind11.h"
namespace py = pybind11;
namespace nl = nlohmann;
namespace pyjson
{
inline py::object from_json(const nl::json& j)
{
if (j.is_null())
{
return py::none();
}
else if (j.is_boolean())
{
return py::bool_(j.get<bool>());
}
else if (j.is_number_unsigned())
{
return py::int_(j.get<nl::json::number_unsigned_t>());
}
else if (j.is_number_integer())
{
return py::int_(j.get<nl::json::number_integer_t>());
}
else if (j.is_number_float())
{
return py::float_(j.get<double>());
}
else if (j.is_string())
{
return py::str(j.get<std::string>());
}
else if (j.is_array())
{
py::list obj(j.size());
for (std::size_t i = 0; i < j.size(); i++)
{
obj[i] = from_json(j[i]);
}
return obj;
}
else // Object
{
py::dict obj;
for (nl::json::const_iterator it = j.cbegin(); it != j.cend(); ++it)
{
obj[py::str(it.key())] = from_json(it.value());
}
return obj;
}
}
inline nl::json to_json(const py::handle& obj, std::set<const PyObject*>& refs)
{
if (obj.ptr() == nullptr || obj.is_none())
{
return nullptr;
}
if (py::isinstance<py::bool_>(obj))
{
return obj.cast<bool>();
}
if (py::isinstance<py::int_>(obj))
{
try
{
nl::json::number_integer_t s = obj.cast<nl::json::number_integer_t>();
if (py::int_(s).equal(obj))
{
return s;
}
}
catch (...)
{
}
try
{
nl::json::number_unsigned_t u = obj.cast<nl::json::number_unsigned_t>();
if (py::int_(u).equal(obj))
{
return u;
}
}
catch (...)
{
}
throw std::runtime_error("to_json received an integer out of range for both nl::json::number_integer_t and nl::json::number_unsigned_t type: " + py::repr(obj).cast<std::string>());
}
if (py::isinstance<py::float_>(obj))
{
return obj.cast<double>();
}
if (py::isinstance<py::bytes>(obj))
{
py::module base64 = py::module::import("base64");
return base64.attr("b64encode")(obj).attr("decode")("utf-8").cast<std::string>();
}
if (py::isinstance<py::str>(obj))
{
return obj.cast<std::string>();
}
if (py::isinstance<py::tuple>(obj) || py::isinstance<py::list>(obj))
{
auto insert_ret = refs.insert(obj.ptr());
if (!insert_ret.second) {
throw std::runtime_error("Circular reference detected");
}
auto out = nl::json::array();
for (const py::handle value : obj)
{
out.push_back(to_json(value, refs));
}
refs.erase(insert_ret.first);
return out;
}
if (py::isinstance<py::dict>(obj))
{
auto insert_ret = refs.insert(obj.ptr());
if (!insert_ret.second) {
throw std::runtime_error("Circular reference detected");
}
auto out = nl::json::object();
for (const py::handle key : obj)
{
out[py::str(key).cast<std::string>()] = to_json(obj[key], refs);
}
refs.erase(insert_ret.first);
return out;
}
throw std::runtime_error("to_json not implemented for this type of object: " + py::repr(obj).cast<std::string>());
}
inline nl::json to_json(const py::handle& obj)
{
std::set<const PyObject*> refs;
return to_json(obj, refs);
}
}
// nlohmann_json serializers
namespace nlohmann
{
#define MAKE_NLJSON_SERIALIZER_DESERIALIZER(T) \
template <> \
struct adl_serializer<T> \
{ \
inline static void to_json(json& j, const T& obj) \
{ \
j = pyjson::to_json(obj); \
} \
\
inline static T from_json(const json& j) \
{ \
return pyjson::from_json(j); \
} \
}
#define MAKE_NLJSON_SERIALIZER_ONLY(T) \
template <> \
struct adl_serializer<T> \
{ \
inline static void to_json(json& j, const T& obj) \
{ \
j = pyjson::to_json(obj); \
} \
}
MAKE_NLJSON_SERIALIZER_DESERIALIZER(py::object);
MAKE_NLJSON_SERIALIZER_DESERIALIZER(py::bool_);
MAKE_NLJSON_SERIALIZER_DESERIALIZER(py::int_);
MAKE_NLJSON_SERIALIZER_DESERIALIZER(py::float_);
MAKE_NLJSON_SERIALIZER_DESERIALIZER(py::str);
MAKE_NLJSON_SERIALIZER_DESERIALIZER(py::list);
MAKE_NLJSON_SERIALIZER_DESERIALIZER(py::tuple);
MAKE_NLJSON_SERIALIZER_DESERIALIZER(py::dict);
MAKE_NLJSON_SERIALIZER_ONLY(py::handle);
MAKE_NLJSON_SERIALIZER_ONLY(py::detail::item_accessor);
MAKE_NLJSON_SERIALIZER_ONLY(py::detail::list_accessor);
MAKE_NLJSON_SERIALIZER_ONLY(py::detail::tuple_accessor);
MAKE_NLJSON_SERIALIZER_ONLY(py::detail::sequence_accessor);
MAKE_NLJSON_SERIALIZER_ONLY(py::detail::str_attr_accessor);
MAKE_NLJSON_SERIALIZER_ONLY(py::detail::obj_attr_accessor);
#undef MAKE_NLJSON_SERIALIZER
#undef MAKE_NLJSON_SERIALIZER_ONLY
}
// pybind11 caster
namespace pybind11
{
namespace detail
{
template <> struct type_caster<nl::json>
{
public:
PYBIND11_TYPE_CASTER(nl::json, _("json"));
bool load(handle src, bool)
{
try
{
value = pyjson::to_json(src);
return true;
}
catch (...)
{
return false;
}
}
static handle cast(nl::json src, return_value_policy /* policy */, handle /* parent */)
{
object obj = pyjson::from_json(src);
return obj.release();
}
};
}
}
#endif
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