189 lines
7 KiB
C++
189 lines
7 KiB
C++
/*
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* Copyright (c) 2003-2009, John Wiegley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of New Artisans LLC nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _PY_UTILS_H
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#define _PY_UTILS_H
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template <typename T, typename TfromPy>
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struct object_from_python
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{
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object_from_python() {
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boost::python::converter::registry::insert
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(&TfromPy::convertible, &TfromPy::construct,
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boost::python::type_id<T>());
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}
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};
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template <typename T, typename TtoPy, typename TfromPy>
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struct register_python_conversion
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{
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register_python_conversion() {
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boost::python::to_python_converter<T, TtoPy>();
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object_from_python<T, TfromPy>();
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}
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};
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template <typename T>
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struct register_optional_to_python : public boost::noncopyable
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{
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struct optional_to_python
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{
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static PyObject * convert(const boost::optional<T>& value)
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{
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return boost::python::incref
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(value ? boost::python::to_python_value<T>()(*value) :
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boost::python::detail::none());
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}
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};
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struct optional_from_python
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{
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static void * convertible(PyObject * source)
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{
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using namespace boost::python::converter;
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if (source == Py_None)
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return source;
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const registration& converters(registered<T>::converters);
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if (implicit_rvalue_convertible_from_python(source, converters)) {
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rvalue_from_python_stage1_data data =
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rvalue_from_python_stage1(source, converters);
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return rvalue_from_python_stage2(source, data, converters);
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}
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return NULL;
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}
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static void construct(PyObject * source,
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boost::python::converter::rvalue_from_python_stage1_data * data)
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{
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using namespace boost::python::converter;
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void * const storage =
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reinterpret_cast<rvalue_from_python_storage<T> *>(data)->storage.bytes;
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if (data->convertible == source) // == None
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new (storage) boost::optional<T>(); // A Boost uninitialized value
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else
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new (storage) boost::optional<T>(*reinterpret_cast<T *>(data->convertible));
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data->convertible = storage;
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}
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};
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explicit register_optional_to_python() {
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register_python_conversion<boost::optional<T>,
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optional_to_python, optional_from_python>();
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}
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};
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template <typename T1, typename T2>
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struct PairToTupleConverter
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{
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static PyObject * convert(const std::pair<T1, T2>& pair) {
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return boost::python::incref
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(boost::python::make_tuple(pair.first, pair.second).ptr());
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}
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};
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template <typename MapType>
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struct map_value_type_converter
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{
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map_value_type_converter() {
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boost::python::to_python_converter
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<typename MapType::value_type,
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PairToTupleConverter<const typename MapType::key_type,
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typename MapType::mapped_type> >();
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}
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};
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template <typename T>
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PyObject * str_to_py_unicode(const T& str)
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{
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using namespace boost::python;
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PyObject * pstr = PyString_FromString(str.c_str());
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PyObject * uni = PyUnicode_FromEncodedObject(pstr, "UTF-8", NULL);
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return object(handle<>(borrowed(uni))).ptr();
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}
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namespace boost { namespace python {
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// Use expr to create the PyObject corresponding to x
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# define BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T, expr, pytype)\
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template <> struct to_python_value<T&> \
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: detail::builtin_to_python \
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{ \
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inline PyObject* operator()(T const& x) const \
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{ \
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return (expr); \
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} \
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inline PyTypeObject const* get_pytype() const \
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{ \
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return (pytype); \
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} \
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}; \
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template <> struct to_python_value<T const&> \
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: detail::builtin_to_python \
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{ \
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inline PyObject* operator()(T const& x) const \
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{ \
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return (expr); \
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} \
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inline PyTypeObject const* get_pytype() const \
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{ \
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return (pytype); \
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} \
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};
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# define BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T, expr) \
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namespace converter \
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{ \
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template <> struct arg_to_python< T > \
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: handle<> \
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{ \
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arg_to_python(T const& x) \
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: python::handle<>(expr) {} \
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}; \
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}
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// Specialize argument and return value converters for T using expr
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# define BOOST_PYTHON_TO_PYTHON_BY_VALUE(T, expr, pytype) \
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BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T,expr, pytype) \
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BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T,expr)
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(ledger::string, ::PyUnicode_FromEncodedObject(::PyString_FromString(x.c_str()), "UTF-8", NULL), &PyUnicode_Type)
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} } // namespace boost::python
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//boost::python::register_ptr_to_python< boost::shared_ptr<Base> >();
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#endif // _PY_UTILS_H
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