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/*
* Copyright (c) 2003-2023, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* @addtogroup python
*/
/**
* @file pyutils.h
* @author John Wiegley
*
* @ingroup python
*
* @brief Basic utilities for Python API.
*/
#pragma once
namespace ledger { namespace python {
template <typename T, typename TfromPy>
struct object_from_python
{
object_from_python() {
boost::python::converter::registry::insert
(&TfromPy::convertible, &TfromPy::construct,
boost::python::type_id<T>());
}
};
template <typename T, typename TtoPy, typename TfromPy>
struct register_python_conversion
{
register_python_conversion() {
boost::python::to_python_converter<T, TtoPy>();
object_from_python<T, TfromPy>();
}
};
template <typename T>
struct register_optional_to_python : public boost::noncopyable
{
struct optional_to_python
{
static PyObject * convert(const boost::optional<T>& value)
{
return boost::python::incref
(value ? boost::python::to_python_value<T>()(*value) :
boost::python::detail::none());
}
};
struct optional_from_python
{
static void * convertible(PyObject * source)
{
using namespace boost::python::converter;
if (source == Py_None)
return source;
const registration& converters(registered<T>::converters);
if (implicit_rvalue_convertible_from_python(source, converters)) {
rvalue_from_python_stage1_data data =
rvalue_from_python_stage1(source, converters);
return rvalue_from_python_stage2(source, data, converters);
}
return NULL;
}
static void construct(PyObject * source,
boost::python::converter::rvalue_from_python_stage1_data * data)
{
using namespace boost::python::converter;
const T value = typename boost::python::extract<T>(source);
void * storage = ((rvalue_from_python_storage<boost::optional<T>>*) data)->storage.bytes;
if (source == Py_None) // == None
new (storage) boost::optional<T>(); // A Boost uninitialized value
else
new (storage) boost::optional<T>(value);
data->convertible = storage;
}
};
explicit register_optional_to_python() {
register_python_conversion<boost::optional<T>,
optional_to_python, optional_from_python>();
}
};
template <typename T1, typename T2>
struct PairToTupleConverter
{
static PyObject * convert(const std::pair<T1, T2>& pair) {
return boost::python::incref
(boost::python::make_tuple(pair.first, pair.second).ptr());
}
};
template <typename MapType>
struct map_value_type_converter
{
map_value_type_converter() {
boost::python::to_python_converter
<typename MapType::value_type,
PairToTupleConverter<const typename MapType::key_type,
typename MapType::mapped_type> >();
}
};
template <typename T>
PyObject * str_to_py_unicode(const T& str)
{
using namespace boost::python;
PyObject * uni = PyUnicode_FromString(str.c_str());
return object(handle<>(borrowed(uni))).ptr();
}
} } // namespace ledger::python
namespace boost { namespace python {
// Use expr to create the PyObject corresponding to x
# define BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T, expr, pytype)\
template <> struct to_python_value<T&> \
: detail::builtin_to_python \
{ \
inline PyObject* operator()(T const& x) const \
{ \
return (expr); \
} \
inline PyTypeObject const* get_pytype() const \
{ \
return (pytype); \
} \
}; \
template <> struct to_python_value<T const&> \
: detail::builtin_to_python \
{ \
inline PyObject* operator()(T const& x) const \
{ \
return (expr); \
} \
inline PyTypeObject const* get_pytype() const \
{ \
return (pytype); \
} \
};
# define BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T, expr) \
namespace converter \
{ \
template <> struct arg_to_python< T > \
: handle<> \
{ \
arg_to_python(T const& x) \
: boost::python::handle<>(expr) {} \
}; \
}
// Specialize argument and return value converters for T using expr
# define BOOST_PYTHON_TO_PYTHON_BY_VALUE(T, expr, pytype) \
BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T,expr, pytype) \
BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T,expr)
} } // namespace boost::python
//boost::python::register_ptr_to_python< boost::shared_ptr<Base> >();
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