python-1/src/object_protocol.cpp at develop · Deepak007oo/python-1 · GitHub

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// Copyright David Abrahams 2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#include <boost/python/object_protocol.hpp>

#include <boost/python/errors.hpp>

#include <boost/python/object.hpp>

#include <boost/python/ssize_t.hpp>

namespace boost { namespace python { namespace api {

BOOST_PYTHON_DECL object getattr(object const& target, object const& key)

{

return object(detail::new_reference(PyObject_GetAttr(target.ptr(), key.ptr())));

}

BOOST_PYTHON_DECL object getattr(object const& target, object const& key, object const& default_)

{

PyObject* result = PyObject_GetAttr(target.ptr(), key.ptr());

if (result == NULL && PyErr_ExceptionMatches(PyExc_AttributeError))

{

PyErr_Clear();

return default_;

}

return object(detail::new_reference(result));

}

BOOST_PYTHON_DECL void setattr(object const& target, object const& key, object const& value)

{

if (PyObject_SetAttr(target.ptr(), key.ptr(), value.ptr()) == -1)

throw_error_already_set();

}

BOOST_PYTHON_DECL void delattr(object const& target, object const& key)

{

if (PyObject_DelAttr(target.ptr(), key.ptr()) == -1)

throw_error_already_set();

}

BOOST_PYTHON_DECL object getattr(object const& target, char const* key)

{

return object(

detail::new_reference(

PyObject_GetAttrString(target.ptr(), const_cast<char*>(key))

));

}

BOOST_PYTHON_DECL object getattr(object const& target, char const* key, object const& default_)

{

PyObject* result = PyObject_GetAttrString(target.ptr(), const_cast<char*>(key));

if (result == NULL && PyErr_ExceptionMatches(PyExc_AttributeError))

{

PyErr_Clear();

return default_;

}

return object(detail::new_reference(result));

}

BOOST_PYTHON_DECL void setattr(object const& target, char const* key, object const& value)

{

if (PyObject_SetAttrString(

target.ptr(), const_cast<char*>(key), value.ptr()) == -1

)

{

throw_error_already_set();

}

BOOST_PYTHON_DECL void delattr(object const& target, char const* key)

{

if (PyObject_DelAttrString(

target.ptr(), const_cast<char*>(key)) == -1

)

{

throw_error_already_set();

}

BOOST_PYTHON_DECL object getitem(object const& target, object const& key)

{

return object(detail::new_reference(

PyObject_GetItem(target.ptr(), key.ptr())));

}

BOOST_PYTHON_DECL void setitem(object const& target, object const& key, object const& value)

{

if (PyObject_SetItem(target.ptr(), key.ptr(), value.ptr()) == -1)

throw_error_already_set();

}

BOOST_PYTHON_DECL void delitem(object const& target, object const& key)

{

if (PyObject_DelItem(target.ptr(), key.ptr()) == -1)

throw_error_already_set();

}

namespace // slicing code copied directly out of the Python implementation

{

#undef ISINT

#define ISINT(x) ((x) == NULL || PyInt_Check(x) || PyLong_Check(x))

static PyObject *

apply_slice(PyObject *u, PyObject *v, PyObject *w) /* return u[v:w] */

{

#if PY_VERSION_HEX < 0x03000000

PyTypeObject *tp = u->ob_type;

PySequenceMethods *sq = tp->tp_as_sequence;

if (sq && sq->sq_slice && ISINT(v) && ISINT(w)) {

ssize_t ilow = 0, ihigh = ssize_t_max;

if (!_PyEval_SliceIndex(v, &ilow))

return NULL;

if (!_PyEval_SliceIndex(w, &ihigh))

return NULL;

return PySequence_GetSlice(u, ilow, ihigh);

}

else

#endif

{

PyObject *slice = PySlice_New(v, w, NULL);

if (slice != NULL) {

PyObject *res = PyObject_GetItem(u, slice);

Py_DECREF(slice);

return res;

}

else

return NULL;

}

static int

assign_slice(PyObject *u, PyObject *v, PyObject *w, PyObject *x)

/* u[v:w] = x */

{

#if PY_VERSION_HEX < 0x03000000

PyTypeObject *tp = u->ob_type;

PySequenceMethods *sq = tp->tp_as_sequence;

if (sq && sq->sq_slice && ISINT(v) && ISINT(w)) {

ssize_t ilow = 0, ihigh = ssize_t_max;

if (!_PyEval_SliceIndex(v, &ilow))

return -1;

if (!_PyEval_SliceIndex(w, &ihigh))

return -1;

if (x == NULL)

return PySequence_DelSlice(u, ilow, ihigh);

else

return PySequence_SetSlice(u, ilow, ihigh, x);

}

else

#endif

{

PyObject *slice = PySlice_New(v, w, NULL);

if (slice != NULL) {

int res;

if (x != NULL)

res = PyObject_SetItem(u, slice, x);

else

res = PyObject_DelItem(u, slice);

Py_DECREF(slice);

return res;

}

else

return -1;

}

BOOST_PYTHON_DECL object getslice(object const& target, handle<> const& begin, handle<> const& end)

{

return object(

detail::new_reference(

apply_slice(target.ptr(), begin.get(), end.get())));

}

BOOST_PYTHON_DECL void setslice(object const& target, handle<> const& begin, handle<> const& end, object const& value)

{

if (assign_slice(

target.ptr(), begin.get(), end.get(), value.ptr()) == -1

)

{

throw_error_already_set();

}

BOOST_PYTHON_DECL void delslice(object const& target, handle<> const& begin, handle<> const& end)

{

if (assign_slice(

target.ptr(), begin.get(), end.get(), 0) == -1

)

{

throw_error_already_set();

}

}}} // namespace boost::python::api

python-1/src/object_protocol.cpp at develop · Deepak007oo/python-1 · GitHub

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