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/*=========================================================================
Program: Visualization Toolkit
Module: PyVTKMethodDescriptor.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "PyVTKMethodDescriptor.h"
#include "vtkPythonUtil.h"
#include <structmember.h> // a python header
// Silence warning like
// "dereferencing type-punned pointer will break strict-aliasing rules"
// it happens because this kind of expression: (long *)&ptr
#if defined(__GNUC__)
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
#endif
// Required for Python 2.5 through Python 2.7
#ifndef PyDescr_TYPE
#define PyDescr_TYPE(x) (((PyDescrObject *)(x))->d_type)
#define PyDescr_NAME(x) (((PyDescrObject *)(x))->d_name)
#endif
//--------------------------------------------------------------------
// C API
PyObject *PyVTKMethodDescriptor_New(PyTypeObject *pytype, PyMethodDef *meth)
{
PyMethodDescrObject *descr = (PyMethodDescrObject *)
PyType_GenericAlloc(&PyVTKMethodDescriptor_Type, 0);
if (descr)
{
Py_XINCREF(pytype);
PyDescr_TYPE(descr) = pytype;
PyDescr_NAME(descr) = PyString_InternFromString(meth->ml_name);
descr->d_method = meth;
if (!PyDescr_NAME(descr))
{
Py_DECREF(descr);
descr = 0;
}
}
return (PyObject *)descr;
}
//--------------------------------------------------------------------
// Object protocol
static void PyVTKMethodDescriptor_Delete(PyObject *ob)
{
PyMethodDescrObject *descr = (PyMethodDescrObject *)ob;
PyObject_GC_UnTrack(descr);
Py_XDECREF(PyDescr_TYPE(descr));
Py_XDECREF(PyDescr_NAME(descr));
PyObject_GC_Del(descr);
}
static PyObject *PyVTKMethodDescriptor_Repr(PyObject *ob)
{
PyMethodDescrObject *descr = (PyMethodDescrObject *)ob;
#ifdef VTK_PY3K
return PyUnicode_FromFormat("<method \'%U\' of \'%s\' objects>",
PyDescr_NAME(descr), PyDescr_TYPE(descr)->tp_name);
#else
return PyString_FromFormat("<method \'%s\' of \'%s\' objects>",
PyString_AS_STRING(descr->d_name), descr->d_type->tp_name);
#endif
}
static int PyVTKMethodDescriptor_Traverse(
PyObject *ob, visitproc visit, void *arg)
{
PyMethodDescrObject *descr = (PyMethodDescrObject *)ob;
Py_VISIT(PyDescr_TYPE(descr));
return 0;
}
static PyObject *PyVTKMethodDescriptor_Call(
PyObject *ob, PyObject *args, PyObject *kwds)
{
PyMethodDescrObject *descr = (PyMethodDescrObject *)ob;
PyObject *result = 0;
PyObject *func = PyCFunction_New(
descr->d_method, (PyObject *)PyDescr_TYPE(descr));
if (func)
{
result = PyEval_CallObjectWithKeywords(func, args, kwds);
Py_DECREF(func);
}
return result;
}
static PyObject *PyVTKMethodDescriptor_Get(
PyObject *self, PyObject *obj, PyObject *)
{
PyMethodDescrObject *descr = (PyMethodDescrObject *)self;
if (obj == NULL)
{
// If no object to bind to, return the descriptor itself
Py_INCREF(self);
return self;
}
if (PyObject_TypeCheck(obj, PyDescr_TYPE(descr)))
{
// Bind the method to the object
return PyCFunction_New(descr->d_method, obj);
}
#ifdef VTK_PY3K
PyErr_Format(
PyExc_TypeError,
"descriptor '%U' for '%s' objects doesn't apply to '%s' object",
PyDescr_NAME(descr), PyDescr_TYPE(descr)->tp_name,
Py_TYPE(obj)->tp_name);
#else
PyErr_Format(
PyExc_TypeError,
"descriptor '%s' for '%s' objects doesn't apply to '%s' object",
PyString_AS_STRING(PyDescr_NAME(descr)), PyDescr_TYPE(descr)->tp_name,
Py_TYPE(obj)->tp_name);
#endif
return NULL;
}
static PyObject *PyVTKMethodDescriptor_GetDoc(PyObject *ob, void *)
{
PyMethodDescrObject *descr = (PyMethodDescrObject *)ob;
if (descr->d_method->ml_doc == NULL)
{
Py_INCREF(Py_None);
return Py_None;
}
return PyString_FromString(descr->d_method->ml_doc);
}
static PyGetSetDef PyVTKMethodDescriptor_GetSet[] = {
{ (char *)"__doc__", PyVTKMethodDescriptor_GetDoc, 0, 0, 0 },
{ 0, 0, 0, 0, 0 }
};
static PyMemberDef PyVTKMethodDescriptor_Members[] = {
{ (char *)"__objclass__", T_OBJECT, offsetof(PyDescrObject, d_type),
READONLY, 0 },
{ (char *)"__name__", T_OBJECT, offsetof(PyDescrObject, d_name),
READONLY, 0 },
{ 0, 0, 0, 0, 0 }
};
//--------------------------------------------------------------------
PyTypeObject PyVTKMethodDescriptor_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"vtkCommonCorePython.method_descriptor", // tp_name
sizeof(PyMethodDescrObject), // tp_basicsize
0, // tp_itemsize
PyVTKMethodDescriptor_Delete, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
PyVTKMethodDescriptor_Repr, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
PyVTKMethodDescriptor_Call, // tp_call
0, // tp_string
PyObject_GenericGetAttr, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, // tp_flags
0, // tp_doc
PyVTKMethodDescriptor_Traverse, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
0, // tp_iter
0, // tp_iternext
0, // tp_methods
PyVTKMethodDescriptor_Members, // tp_members
PyVTKMethodDescriptor_GetSet, // tp_getset
0, // tp_base
0, // tp_dict
PyVTKMethodDescriptor_Get, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
0, // tp_init
0, // tp_alloc
0, // tp_new
0, // tp_free
0, // tp_is_gc
0, // tp_bases
0, // tp_mro
0, // tp_cache
0, // tp_subclasses
0, // tp_weaklist
VTK_WRAP_PYTHON_SUPPRESS_UNINITIALIZED
};
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