1459 lines
48 KiB
C
1459 lines
48 KiB
C
/* Descriptors -- a new, flexible way to describe attributes */
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#include "Python.h"
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#include "structmember.h" /* Why is this not included in Python.h? */
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static void
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descr_dealloc(PyDescrObject *descr)
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{
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_PyObject_GC_UNTRACK(descr);
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Py_XDECREF(descr->d_type);
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Py_XDECREF(descr->d_name);
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Py_XDECREF(descr->d_qualname);
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PyObject_GC_Del(descr);
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}
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static PyObject *
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descr_name(PyDescrObject *descr)
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{
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if (descr->d_name != NULL && PyUnicode_Check(descr->d_name))
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return descr->d_name;
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return NULL;
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}
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static PyObject *
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descr_repr(PyDescrObject *descr, char *format)
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{
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PyObject *name = NULL;
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if (descr->d_name != NULL && PyUnicode_Check(descr->d_name))
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name = descr->d_name;
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return PyUnicode_FromFormat(format, name, "?", descr->d_type->tp_name);
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}
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static PyObject *
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method_repr(PyMethodDescrObject *descr)
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{
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return descr_repr((PyDescrObject *)descr,
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"<method '%V' of '%s' objects>");
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}
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static PyObject *
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member_repr(PyMemberDescrObject *descr)
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{
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return descr_repr((PyDescrObject *)descr,
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"<member '%V' of '%s' objects>");
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}
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static PyObject *
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getset_repr(PyGetSetDescrObject *descr)
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{
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return descr_repr((PyDescrObject *)descr,
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"<attribute '%V' of '%s' objects>");
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}
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static PyObject *
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wrapperdescr_repr(PyWrapperDescrObject *descr)
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{
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return descr_repr((PyDescrObject *)descr,
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"<slot wrapper '%V' of '%s' objects>");
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}
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static int
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descr_check(PyDescrObject *descr, PyObject *obj, PyObject **pres)
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{
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if (obj == NULL) {
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Py_INCREF(descr);
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*pres = (PyObject *)descr;
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return 1;
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}
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if (!PyObject_TypeCheck(obj, descr->d_type)) {
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' for '%s' objects "
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"doesn't apply to '%s' object",
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descr_name((PyDescrObject *)descr), "?",
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descr->d_type->tp_name,
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obj->ob_type->tp_name);
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*pres = NULL;
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return 1;
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}
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return 0;
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}
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static PyObject *
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classmethod_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)
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{
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/* Ensure a valid type. Class methods ignore obj. */
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if (type == NULL) {
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if (obj != NULL)
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type = (PyObject *)obj->ob_type;
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else {
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/* Wot - no type?! */
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' for type '%s' "
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"needs either an object or a type",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name);
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return NULL;
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}
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}
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if (!PyType_Check(type)) {
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' for type '%s' "
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"needs a type, not a '%s' as arg 2",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name,
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type->ob_type->tp_name);
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return NULL;
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}
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if (!PyType_IsSubtype((PyTypeObject *)type, PyDescr_TYPE(descr))) {
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' for type '%s' "
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"doesn't apply to type '%s'",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name,
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((PyTypeObject *)type)->tp_name);
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return NULL;
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}
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return PyCFunction_New(descr->d_method, type);
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}
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static PyObject *
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method_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)
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{
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PyObject *res;
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if (descr_check((PyDescrObject *)descr, obj, &res))
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return res;
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return PyCFunction_New(descr->d_method, obj);
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}
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static PyObject *
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member_get(PyMemberDescrObject *descr, PyObject *obj, PyObject *type)
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{
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PyObject *res;
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if (descr_check((PyDescrObject *)descr, obj, &res))
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return res;
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return PyMember_GetOne((char *)obj, descr->d_member);
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}
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static PyObject *
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getset_get(PyGetSetDescrObject *descr, PyObject *obj, PyObject *type)
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{
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PyObject *res;
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if (descr_check((PyDescrObject *)descr, obj, &res))
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return res;
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if (descr->d_getset->get != NULL)
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return descr->d_getset->get(obj, descr->d_getset->closure);
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PyErr_Format(PyExc_AttributeError,
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"attribute '%V' of '%.100s' objects is not readable",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name);
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return NULL;
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}
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static PyObject *
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wrapperdescr_get(PyWrapperDescrObject *descr, PyObject *obj, PyObject *type)
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{
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PyObject *res;
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if (descr_check((PyDescrObject *)descr, obj, &res))
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return res;
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return PyWrapper_New((PyObject *)descr, obj);
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}
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static int
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descr_setcheck(PyDescrObject *descr, PyObject *obj, PyObject *value,
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int *pres)
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{
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assert(obj != NULL);
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if (!PyObject_TypeCheck(obj, descr->d_type)) {
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' for '%.100s' objects "
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"doesn't apply to '%.100s' object",
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descr_name(descr), "?",
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descr->d_type->tp_name,
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obj->ob_type->tp_name);
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*pres = -1;
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return 1;
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}
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return 0;
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}
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static int
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member_set(PyMemberDescrObject *descr, PyObject *obj, PyObject *value)
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{
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int res;
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if (descr_setcheck((PyDescrObject *)descr, obj, value, &res))
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return res;
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return PyMember_SetOne((char *)obj, descr->d_member, value);
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}
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static int
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getset_set(PyGetSetDescrObject *descr, PyObject *obj, PyObject *value)
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{
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int res;
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if (descr_setcheck((PyDescrObject *)descr, obj, value, &res))
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return res;
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if (descr->d_getset->set != NULL)
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return descr->d_getset->set(obj, value,
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descr->d_getset->closure);
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PyErr_Format(PyExc_AttributeError,
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"attribute '%V' of '%.100s' objects is not writable",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name);
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return -1;
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}
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static PyObject *
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methoddescr_call(PyMethodDescrObject *descr, PyObject *args, PyObject *kwds)
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{
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Py_ssize_t argc;
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PyObject *self, *func, *result;
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/* Make sure that the first argument is acceptable as 'self' */
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assert(PyTuple_Check(args));
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argc = PyTuple_GET_SIZE(args);
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if (argc < 1) {
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' of '%.100s' "
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"object needs an argument",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name);
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return NULL;
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}
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self = PyTuple_GET_ITEM(args, 0);
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if (!_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),
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(PyObject *)PyDescr_TYPE(descr))) {
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' "
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"requires a '%.100s' object "
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"but received a '%.100s'",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name,
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self->ob_type->tp_name);
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return NULL;
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}
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func = PyCFunction_New(descr->d_method, self);
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if (func == NULL)
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return NULL;
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args = PyTuple_GetSlice(args, 1, argc);
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if (args == NULL) {
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Py_DECREF(func);
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return NULL;
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}
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result = PyEval_CallObjectWithKeywords(func, args, kwds);
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Py_DECREF(args);
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Py_DECREF(func);
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return result;
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}
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static PyObject *
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classmethoddescr_call(PyMethodDescrObject *descr, PyObject *args,
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PyObject *kwds)
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{
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PyObject *func, *result;
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func = PyCFunction_New(descr->d_method, (PyObject *)PyDescr_TYPE(descr));
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if (func == NULL)
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return NULL;
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result = PyEval_CallObjectWithKeywords(func, args, kwds);
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Py_DECREF(func);
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return result;
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}
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static PyObject *
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wrapperdescr_call(PyWrapperDescrObject *descr, PyObject *args, PyObject *kwds)
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{
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Py_ssize_t argc;
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PyObject *self, *func, *result;
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/* Make sure that the first argument is acceptable as 'self' */
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assert(PyTuple_Check(args));
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argc = PyTuple_GET_SIZE(args);
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if (argc < 1) {
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' of '%.100s' "
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"object needs an argument",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name);
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return NULL;
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}
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self = PyTuple_GET_ITEM(args, 0);
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if (!_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),
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(PyObject *)PyDescr_TYPE(descr))) {
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PyErr_Format(PyExc_TypeError,
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"descriptor '%V' "
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"requires a '%.100s' object "
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"but received a '%.100s'",
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descr_name((PyDescrObject *)descr), "?",
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PyDescr_TYPE(descr)->tp_name,
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self->ob_type->tp_name);
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return NULL;
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}
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func = PyWrapper_New((PyObject *)descr, self);
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if (func == NULL)
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return NULL;
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args = PyTuple_GetSlice(args, 1, argc);
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if (args == NULL) {
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Py_DECREF(func);
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return NULL;
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}
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result = PyEval_CallObjectWithKeywords(func, args, kwds);
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Py_DECREF(args);
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Py_DECREF(func);
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return result;
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}
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static PyObject *
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method_get_doc(PyMethodDescrObject *descr, void *closure)
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{
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if (descr->d_method->ml_doc == NULL) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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return PyUnicode_FromString(descr->d_method->ml_doc);
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}
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static PyObject *
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calculate_qualname(PyDescrObject *descr)
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{
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PyObject *type_qualname, *res;
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_Py_IDENTIFIER(__qualname__);
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if (descr->d_name == NULL || !PyUnicode_Check(descr->d_name)) {
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PyErr_SetString(PyExc_TypeError,
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"<descriptor>.__name__ is not a unicode object");
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return NULL;
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}
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type_qualname = _PyObject_GetAttrId((PyObject *)descr->d_type,
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&PyId___qualname__);
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if (type_qualname == NULL)
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return NULL;
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if (!PyUnicode_Check(type_qualname)) {
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PyErr_SetString(PyExc_TypeError, "<descriptor>.__objclass__."
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"__qualname__ is not a unicode object");
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Py_XDECREF(type_qualname);
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return NULL;
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}
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res = PyUnicode_FromFormat("%S.%S", type_qualname, descr->d_name);
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Py_DECREF(type_qualname);
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return res;
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}
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static PyObject *
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descr_get_qualname(PyDescrObject *descr)
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{
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if (descr->d_qualname == NULL)
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descr->d_qualname = calculate_qualname(descr);
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Py_XINCREF(descr->d_qualname);
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return descr->d_qualname;
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}
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static PyMemberDef descr_members[] = {
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{"__objclass__", T_OBJECT, offsetof(PyDescrObject, d_type), READONLY},
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{"__name__", T_OBJECT, offsetof(PyDescrObject, d_name), READONLY},
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{0}
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};
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static PyGetSetDef method_getset[] = {
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{"__doc__", (getter)method_get_doc},
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{"__qualname__", (getter)descr_get_qualname},
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{0}
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};
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static PyObject *
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member_get_doc(PyMemberDescrObject *descr, void *closure)
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{
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if (descr->d_member->doc == NULL) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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return PyUnicode_FromString(descr->d_member->doc);
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}
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static PyGetSetDef member_getset[] = {
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{"__doc__", (getter)member_get_doc},
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{"__qualname__", (getter)descr_get_qualname},
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{0}
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};
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static PyObject *
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getset_get_doc(PyGetSetDescrObject *descr, void *closure)
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{
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if (descr->d_getset->doc == NULL) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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return PyUnicode_FromString(descr->d_getset->doc);
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}
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static PyGetSetDef getset_getset[] = {
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{"__doc__", (getter)getset_get_doc},
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{"__qualname__", (getter)descr_get_qualname},
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{0}
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};
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static PyObject *
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wrapperdescr_get_doc(PyWrapperDescrObject *descr, void *closure)
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{
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if (descr->d_base->doc == NULL) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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return PyUnicode_FromString(descr->d_base->doc);
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}
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static PyGetSetDef wrapperdescr_getset[] = {
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{"__doc__", (getter)wrapperdescr_get_doc},
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{"__qualname__", (getter)descr_get_qualname},
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{0}
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};
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static int
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descr_traverse(PyObject *self, visitproc visit, void *arg)
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{
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PyDescrObject *descr = (PyDescrObject *)self;
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Py_VISIT(descr->d_type);
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return 0;
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}
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PyTypeObject PyMethodDescr_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"method_descriptor",
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sizeof(PyMethodDescrObject),
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0,
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(destructor)descr_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_reserved */
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(reprfunc)method_repr, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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(ternaryfunc)methoddescr_call, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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0, /* tp_doc */
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descr_traverse, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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descr_members, /* tp_members */
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method_getset, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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(descrgetfunc)method_get, /* tp_descr_get */
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0, /* tp_descr_set */
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};
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/* This is for METH_CLASS in C, not for "f = classmethod(f)" in Python! */
|
|
PyTypeObject PyClassMethodDescr_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"classmethod_descriptor",
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sizeof(PyMethodDescrObject),
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0,
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(destructor)descr_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_reserved */
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(reprfunc)method_repr, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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(ternaryfunc)classmethoddescr_call, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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0, /* tp_doc */
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descr_traverse, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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descr_members, /* tp_members */
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method_getset, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
|
|
(descrgetfunc)classmethod_get, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
};
|
|
|
|
PyTypeObject PyMemberDescr_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"member_descriptor",
|
|
sizeof(PyMemberDescrObject),
|
|
0,
|
|
(destructor)descr_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_reserved */
|
|
(reprfunc)member_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
0, /* tp_hash */
|
|
0, /* tp_call */
|
|
0, /* tp_str */
|
|
PyObject_GenericGetAttr, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
|
|
0, /* tp_doc */
|
|
descr_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
descr_members, /* tp_members */
|
|
member_getset, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
(descrgetfunc)member_get, /* tp_descr_get */
|
|
(descrsetfunc)member_set, /* tp_descr_set */
|
|
};
|
|
|
|
PyTypeObject PyGetSetDescr_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"getset_descriptor",
|
|
sizeof(PyGetSetDescrObject),
|
|
0,
|
|
(destructor)descr_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_reserved */
|
|
(reprfunc)getset_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
0, /* tp_hash */
|
|
0, /* tp_call */
|
|
0, /* tp_str */
|
|
PyObject_GenericGetAttr, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
|
|
0, /* tp_doc */
|
|
descr_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
descr_members, /* tp_members */
|
|
getset_getset, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
(descrgetfunc)getset_get, /* tp_descr_get */
|
|
(descrsetfunc)getset_set, /* tp_descr_set */
|
|
};
|
|
|
|
PyTypeObject PyWrapperDescr_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"wrapper_descriptor",
|
|
sizeof(PyWrapperDescrObject),
|
|
0,
|
|
(destructor)descr_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_reserved */
|
|
(reprfunc)wrapperdescr_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
0, /* tp_hash */
|
|
(ternaryfunc)wrapperdescr_call, /* tp_call */
|
|
0, /* tp_str */
|
|
PyObject_GenericGetAttr, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
|
|
0, /* tp_doc */
|
|
descr_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
descr_members, /* tp_members */
|
|
wrapperdescr_getset, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
(descrgetfunc)wrapperdescr_get, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
};
|
|
|
|
static PyDescrObject *
|
|
descr_new(PyTypeObject *descrtype, PyTypeObject *type, const char *name)
|
|
{
|
|
PyDescrObject *descr;
|
|
|
|
descr = (PyDescrObject *)PyType_GenericAlloc(descrtype, 0);
|
|
if (descr != NULL) {
|
|
Py_XINCREF(type);
|
|
descr->d_type = type;
|
|
descr->d_name = PyUnicode_InternFromString(name);
|
|
if (descr->d_name == NULL) {
|
|
Py_DECREF(descr);
|
|
descr = NULL;
|
|
}
|
|
descr->d_qualname = NULL;
|
|
}
|
|
return descr;
|
|
}
|
|
|
|
PyObject *
|
|
PyDescr_NewMethod(PyTypeObject *type, PyMethodDef *method)
|
|
{
|
|
PyMethodDescrObject *descr;
|
|
|
|
descr = (PyMethodDescrObject *)descr_new(&PyMethodDescr_Type,
|
|
type, method->ml_name);
|
|
if (descr != NULL)
|
|
descr->d_method = method;
|
|
return (PyObject *)descr;
|
|
}
|
|
|
|
PyObject *
|
|
PyDescr_NewClassMethod(PyTypeObject *type, PyMethodDef *method)
|
|
{
|
|
PyMethodDescrObject *descr;
|
|
|
|
descr = (PyMethodDescrObject *)descr_new(&PyClassMethodDescr_Type,
|
|
type, method->ml_name);
|
|
if (descr != NULL)
|
|
descr->d_method = method;
|
|
return (PyObject *)descr;
|
|
}
|
|
|
|
PyObject *
|
|
PyDescr_NewMember(PyTypeObject *type, PyMemberDef *member)
|
|
{
|
|
PyMemberDescrObject *descr;
|
|
|
|
descr = (PyMemberDescrObject *)descr_new(&PyMemberDescr_Type,
|
|
type, member->name);
|
|
if (descr != NULL)
|
|
descr->d_member = member;
|
|
return (PyObject *)descr;
|
|
}
|
|
|
|
PyObject *
|
|
PyDescr_NewGetSet(PyTypeObject *type, PyGetSetDef *getset)
|
|
{
|
|
PyGetSetDescrObject *descr;
|
|
|
|
descr = (PyGetSetDescrObject *)descr_new(&PyGetSetDescr_Type,
|
|
type, getset->name);
|
|
if (descr != NULL)
|
|
descr->d_getset = getset;
|
|
return (PyObject *)descr;
|
|
}
|
|
|
|
PyObject *
|
|
PyDescr_NewWrapper(PyTypeObject *type, struct wrapperbase *base, void *wrapped)
|
|
{
|
|
PyWrapperDescrObject *descr;
|
|
|
|
descr = (PyWrapperDescrObject *)descr_new(&PyWrapperDescr_Type,
|
|
type, base->name);
|
|
if (descr != NULL) {
|
|
descr->d_base = base;
|
|
descr->d_wrapped = wrapped;
|
|
}
|
|
return (PyObject *)descr;
|
|
}
|
|
|
|
|
|
/* --- Readonly proxy for dictionaries (actually any mapping) --- */
|
|
|
|
/* This has no reason to be in this file except that adding new files is a
|
|
bit of a pain */
|
|
|
|
typedef struct {
|
|
PyObject_HEAD
|
|
PyObject *dict;
|
|
} proxyobject;
|
|
|
|
static Py_ssize_t
|
|
proxy_len(proxyobject *pp)
|
|
{
|
|
return PyObject_Size(pp->dict);
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_getitem(proxyobject *pp, PyObject *key)
|
|
{
|
|
return PyObject_GetItem(pp->dict, key);
|
|
}
|
|
|
|
static PyMappingMethods proxy_as_mapping = {
|
|
(lenfunc)proxy_len, /* mp_length */
|
|
(binaryfunc)proxy_getitem, /* mp_subscript */
|
|
0, /* mp_ass_subscript */
|
|
};
|
|
|
|
static int
|
|
proxy_contains(proxyobject *pp, PyObject *key)
|
|
{
|
|
return PyDict_Contains(pp->dict, key);
|
|
}
|
|
|
|
static PySequenceMethods proxy_as_sequence = {
|
|
0, /* sq_length */
|
|
0, /* sq_concat */
|
|
0, /* sq_repeat */
|
|
0, /* sq_item */
|
|
0, /* sq_slice */
|
|
0, /* sq_ass_item */
|
|
0, /* sq_ass_slice */
|
|
(objobjproc)proxy_contains, /* sq_contains */
|
|
0, /* sq_inplace_concat */
|
|
0, /* sq_inplace_repeat */
|
|
};
|
|
|
|
static PyObject *
|
|
proxy_get(proxyobject *pp, PyObject *args)
|
|
{
|
|
PyObject *key, *def = Py_None;
|
|
_Py_IDENTIFIER(get);
|
|
|
|
if (!PyArg_UnpackTuple(args, "get", 1, 2, &key, &def))
|
|
return NULL;
|
|
return _PyObject_CallMethodId(pp->dict, &PyId_get, "(OO)", key, def);
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_keys(proxyobject *pp)
|
|
{
|
|
_Py_IDENTIFIER(keys);
|
|
return _PyObject_CallMethodId(pp->dict, &PyId_keys, NULL);
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_values(proxyobject *pp)
|
|
{
|
|
_Py_IDENTIFIER(values);
|
|
return _PyObject_CallMethodId(pp->dict, &PyId_values, NULL);
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_items(proxyobject *pp)
|
|
{
|
|
_Py_IDENTIFIER(items);
|
|
return _PyObject_CallMethodId(pp->dict, &PyId_items, NULL);
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_copy(proxyobject *pp)
|
|
{
|
|
_Py_IDENTIFIER(copy);
|
|
return _PyObject_CallMethodId(pp->dict, &PyId_copy, NULL);
|
|
}
|
|
|
|
static PyMethodDef proxy_methods[] = {
|
|
{"get", (PyCFunction)proxy_get, METH_VARARGS,
|
|
PyDoc_STR("D.get(k[,d]) -> D[k] if k in D, else d."
|
|
" d defaults to None.")},
|
|
{"keys", (PyCFunction)proxy_keys, METH_NOARGS,
|
|
PyDoc_STR("D.keys() -> list of D's keys")},
|
|
{"values", (PyCFunction)proxy_values, METH_NOARGS,
|
|
PyDoc_STR("D.values() -> list of D's values")},
|
|
{"items", (PyCFunction)proxy_items, METH_NOARGS,
|
|
PyDoc_STR("D.items() -> list of D's (key, value) pairs, as 2-tuples")},
|
|
{"copy", (PyCFunction)proxy_copy, METH_NOARGS,
|
|
PyDoc_STR("D.copy() -> a shallow copy of D")},
|
|
{0}
|
|
};
|
|
|
|
static void
|
|
proxy_dealloc(proxyobject *pp)
|
|
{
|
|
_PyObject_GC_UNTRACK(pp);
|
|
Py_DECREF(pp->dict);
|
|
PyObject_GC_Del(pp);
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_getiter(proxyobject *pp)
|
|
{
|
|
return PyObject_GetIter(pp->dict);
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_str(proxyobject *pp)
|
|
{
|
|
return PyObject_Str(pp->dict);
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_repr(proxyobject *pp)
|
|
{
|
|
return PyUnicode_FromFormat("dict_proxy(%R)", pp->dict);
|
|
}
|
|
|
|
static int
|
|
proxy_traverse(PyObject *self, visitproc visit, void *arg)
|
|
{
|
|
proxyobject *pp = (proxyobject *)self;
|
|
Py_VISIT(pp->dict);
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *
|
|
proxy_richcompare(proxyobject *v, PyObject *w, int op)
|
|
{
|
|
return PyObject_RichCompare(v->dict, w, op);
|
|
}
|
|
|
|
PyTypeObject PyDictProxy_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"dict_proxy", /* tp_name */
|
|
sizeof(proxyobject), /* tp_basicsize */
|
|
0, /* tp_itemsize */
|
|
/* methods */
|
|
(destructor)proxy_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_reserved */
|
|
(reprfunc)proxy_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
&proxy_as_sequence, /* tp_as_sequence */
|
|
&proxy_as_mapping, /* tp_as_mapping */
|
|
0, /* tp_hash */
|
|
0, /* tp_call */
|
|
(reprfunc)proxy_str, /* tp_str */
|
|
PyObject_GenericGetAttr, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
|
|
0, /* tp_doc */
|
|
proxy_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
(richcmpfunc)proxy_richcompare, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
(getiterfunc)proxy_getiter, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
proxy_methods, /* tp_methods */
|
|
0, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
0, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
};
|
|
|
|
PyObject *
|
|
PyDictProxy_New(PyObject *dict)
|
|
{
|
|
proxyobject *pp;
|
|
|
|
pp = PyObject_GC_New(proxyobject, &PyDictProxy_Type);
|
|
if (pp != NULL) {
|
|
Py_INCREF(dict);
|
|
pp->dict = dict;
|
|
_PyObject_GC_TRACK(pp);
|
|
}
|
|
return (PyObject *)pp;
|
|
}
|
|
|
|
|
|
/* --- Wrapper object for "slot" methods --- */
|
|
|
|
/* This has no reason to be in this file except that adding new files is a
|
|
bit of a pain */
|
|
|
|
typedef struct {
|
|
PyObject_HEAD
|
|
PyWrapperDescrObject *descr;
|
|
PyObject *self;
|
|
} wrapperobject;
|
|
|
|
#define Wrapper_Check(v) (Py_TYPE(v) == &_PyMethodWrapper_Type)
|
|
|
|
static void
|
|
wrapper_dealloc(wrapperobject *wp)
|
|
{
|
|
PyObject_GC_UnTrack(wp);
|
|
Py_TRASHCAN_SAFE_BEGIN(wp)
|
|
Py_XDECREF(wp->descr);
|
|
Py_XDECREF(wp->self);
|
|
PyObject_GC_Del(wp);
|
|
Py_TRASHCAN_SAFE_END(wp)
|
|
}
|
|
|
|
#define TEST_COND(cond) ((cond) ? Py_True : Py_False)
|
|
|
|
static PyObject *
|
|
wrapper_richcompare(PyObject *a, PyObject *b, int op)
|
|
{
|
|
int result;
|
|
PyObject *v;
|
|
PyWrapperDescrObject *a_descr, *b_descr;
|
|
|
|
assert(a != NULL && b != NULL);
|
|
|
|
/* both arguments should be wrapperobjects */
|
|
if (!Wrapper_Check(a) || !Wrapper_Check(b)) {
|
|
v = Py_NotImplemented;
|
|
Py_INCREF(v);
|
|
return v;
|
|
}
|
|
|
|
/* compare by descriptor address; if the descriptors are the same,
|
|
compare by the objects they're bound to */
|
|
a_descr = ((wrapperobject *)a)->descr;
|
|
b_descr = ((wrapperobject *)b)->descr;
|
|
if (a_descr == b_descr) {
|
|
a = ((wrapperobject *)a)->self;
|
|
b = ((wrapperobject *)b)->self;
|
|
return PyObject_RichCompare(a, b, op);
|
|
}
|
|
|
|
result = a_descr - b_descr;
|
|
switch (op) {
|
|
case Py_EQ:
|
|
v = TEST_COND(result == 0);
|
|
break;
|
|
case Py_NE:
|
|
v = TEST_COND(result != 0);
|
|
break;
|
|
case Py_LE:
|
|
v = TEST_COND(result <= 0);
|
|
break;
|
|
case Py_GE:
|
|
v = TEST_COND(result >= 0);
|
|
break;
|
|
case Py_LT:
|
|
v = TEST_COND(result < 0);
|
|
break;
|
|
case Py_GT:
|
|
v = TEST_COND(result > 0);
|
|
break;
|
|
default:
|
|
PyErr_BadArgument();
|
|
return NULL;
|
|
}
|
|
Py_INCREF(v);
|
|
return v;
|
|
}
|
|
|
|
static Py_hash_t
|
|
wrapper_hash(wrapperobject *wp)
|
|
{
|
|
Py_hash_t x, y;
|
|
x = _Py_HashPointer(wp->descr);
|
|
if (x == -1)
|
|
return -1;
|
|
y = PyObject_Hash(wp->self);
|
|
if (y == -1)
|
|
return -1;
|
|
x = x ^ y;
|
|
if (x == -1)
|
|
x = -2;
|
|
return x;
|
|
}
|
|
|
|
static PyObject *
|
|
wrapper_repr(wrapperobject *wp)
|
|
{
|
|
return PyUnicode_FromFormat("<method-wrapper '%s' of %s object at %p>",
|
|
wp->descr->d_base->name,
|
|
wp->self->ob_type->tp_name,
|
|
wp->self);
|
|
}
|
|
|
|
static PyMemberDef wrapper_members[] = {
|
|
{"__self__", T_OBJECT, offsetof(wrapperobject, self), READONLY},
|
|
{0}
|
|
};
|
|
|
|
static PyObject *
|
|
wrapper_objclass(wrapperobject *wp)
|
|
{
|
|
PyObject *c = (PyObject *)PyDescr_TYPE(wp->descr);
|
|
|
|
Py_INCREF(c);
|
|
return c;
|
|
}
|
|
|
|
static PyObject *
|
|
wrapper_name(wrapperobject *wp)
|
|
{
|
|
const char *s = wp->descr->d_base->name;
|
|
|
|
return PyUnicode_FromString(s);
|
|
}
|
|
|
|
static PyObject *
|
|
wrapper_doc(wrapperobject *wp)
|
|
{
|
|
const char *s = wp->descr->d_base->doc;
|
|
|
|
if (s == NULL) {
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
else {
|
|
return PyUnicode_FromString(s);
|
|
}
|
|
}
|
|
|
|
static PyObject *
|
|
wrapper_qualname(wrapperobject *wp)
|
|
{
|
|
return descr_get_qualname((PyDescrObject *)wp->descr);
|
|
}
|
|
|
|
static PyGetSetDef wrapper_getsets[] = {
|
|
{"__objclass__", (getter)wrapper_objclass},
|
|
{"__name__", (getter)wrapper_name},
|
|
{"__qualname__", (getter)wrapper_qualname},
|
|
{"__doc__", (getter)wrapper_doc},
|
|
{0}
|
|
};
|
|
|
|
static PyObject *
|
|
wrapper_call(wrapperobject *wp, PyObject *args, PyObject *kwds)
|
|
{
|
|
wrapperfunc wrapper = wp->descr->d_base->wrapper;
|
|
PyObject *self = wp->self;
|
|
|
|
if (wp->descr->d_base->flags & PyWrapperFlag_KEYWORDS) {
|
|
wrapperfunc_kwds wk = (wrapperfunc_kwds)wrapper;
|
|
return (*wk)(self, args, wp->descr->d_wrapped, kwds);
|
|
}
|
|
|
|
if (kwds != NULL && (!PyDict_Check(kwds) || PyDict_Size(kwds) != 0)) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"wrapper %s doesn't take keyword arguments",
|
|
wp->descr->d_base->name);
|
|
return NULL;
|
|
}
|
|
return (*wrapper)(self, args, wp->descr->d_wrapped);
|
|
}
|
|
|
|
static int
|
|
wrapper_traverse(PyObject *self, visitproc visit, void *arg)
|
|
{
|
|
wrapperobject *wp = (wrapperobject *)self;
|
|
Py_VISIT(wp->descr);
|
|
Py_VISIT(wp->self);
|
|
return 0;
|
|
}
|
|
|
|
PyTypeObject _PyMethodWrapper_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"method-wrapper", /* tp_name */
|
|
sizeof(wrapperobject), /* tp_basicsize */
|
|
0, /* tp_itemsize */
|
|
/* methods */
|
|
(destructor)wrapper_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_reserved */
|
|
(reprfunc)wrapper_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
(hashfunc)wrapper_hash, /* tp_hash */
|
|
(ternaryfunc)wrapper_call, /* tp_call */
|
|
0, /* tp_str */
|
|
PyObject_GenericGetAttr, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
|
|
0, /* tp_doc */
|
|
wrapper_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
wrapper_richcompare, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
wrapper_members, /* tp_members */
|
|
wrapper_getsets, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
0, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
};
|
|
|
|
PyObject *
|
|
PyWrapper_New(PyObject *d, PyObject *self)
|
|
{
|
|
wrapperobject *wp;
|
|
PyWrapperDescrObject *descr;
|
|
|
|
assert(PyObject_TypeCheck(d, &PyWrapperDescr_Type));
|
|
descr = (PyWrapperDescrObject *)d;
|
|
assert(_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),
|
|
(PyObject *)PyDescr_TYPE(descr)));
|
|
|
|
wp = PyObject_GC_New(wrapperobject, &_PyMethodWrapper_Type);
|
|
if (wp != NULL) {
|
|
Py_INCREF(descr);
|
|
wp->descr = descr;
|
|
Py_INCREF(self);
|
|
wp->self = self;
|
|
_PyObject_GC_TRACK(wp);
|
|
}
|
|
return (PyObject *)wp;
|
|
}
|
|
|
|
|
|
/* A built-in 'property' type */
|
|
|
|
/*
|
|
class property(object):
|
|
|
|
def __init__(self, fget=None, fset=None, fdel=None, doc=None):
|
|
if doc is None and fget is not None and hasattr(fget, "__doc__"):
|
|
doc = fget.__doc__
|
|
self.__get = fget
|
|
self.__set = fset
|
|
self.__del = fdel
|
|
self.__doc__ = doc
|
|
|
|
def __get__(self, inst, type=None):
|
|
if inst is None:
|
|
return self
|
|
if self.__get is None:
|
|
raise AttributeError, "unreadable attribute"
|
|
return self.__get(inst)
|
|
|
|
def __set__(self, inst, value):
|
|
if self.__set is None:
|
|
raise AttributeError, "can't set attribute"
|
|
return self.__set(inst, value)
|
|
|
|
def __delete__(self, inst):
|
|
if self.__del is None:
|
|
raise AttributeError, "can't delete attribute"
|
|
return self.__del(inst)
|
|
|
|
*/
|
|
|
|
typedef struct {
|
|
PyObject_HEAD
|
|
PyObject *prop_get;
|
|
PyObject *prop_set;
|
|
PyObject *prop_del;
|
|
PyObject *prop_doc;
|
|
int getter_doc;
|
|
} propertyobject;
|
|
|
|
static PyObject * property_copy(PyObject *, PyObject *, PyObject *,
|
|
PyObject *);
|
|
|
|
static PyMemberDef property_members[] = {
|
|
{"fget", T_OBJECT, offsetof(propertyobject, prop_get), READONLY},
|
|
{"fset", T_OBJECT, offsetof(propertyobject, prop_set), READONLY},
|
|
{"fdel", T_OBJECT, offsetof(propertyobject, prop_del), READONLY},
|
|
{"__doc__", T_OBJECT, offsetof(propertyobject, prop_doc), READONLY},
|
|
{0}
|
|
};
|
|
|
|
|
|
PyDoc_STRVAR(getter_doc,
|
|
"Descriptor to change the getter on a property.");
|
|
|
|
static PyObject *
|
|
property_getter(PyObject *self, PyObject *getter)
|
|
{
|
|
return property_copy(self, getter, NULL, NULL);
|
|
}
|
|
|
|
|
|
PyDoc_STRVAR(setter_doc,
|
|
"Descriptor to change the setter on a property.");
|
|
|
|
static PyObject *
|
|
property_setter(PyObject *self, PyObject *setter)
|
|
{
|
|
return property_copy(self, NULL, setter, NULL);
|
|
}
|
|
|
|
|
|
PyDoc_STRVAR(deleter_doc,
|
|
"Descriptor to change the deleter on a property.");
|
|
|
|
static PyObject *
|
|
property_deleter(PyObject *self, PyObject *deleter)
|
|
{
|
|
return property_copy(self, NULL, NULL, deleter);
|
|
}
|
|
|
|
|
|
static PyMethodDef property_methods[] = {
|
|
{"getter", property_getter, METH_O, getter_doc},
|
|
{"setter", property_setter, METH_O, setter_doc},
|
|
{"deleter", property_deleter, METH_O, deleter_doc},
|
|
{0}
|
|
};
|
|
|
|
|
|
static void
|
|
property_dealloc(PyObject *self)
|
|
{
|
|
propertyobject *gs = (propertyobject *)self;
|
|
|
|
_PyObject_GC_UNTRACK(self);
|
|
Py_XDECREF(gs->prop_get);
|
|
Py_XDECREF(gs->prop_set);
|
|
Py_XDECREF(gs->prop_del);
|
|
Py_XDECREF(gs->prop_doc);
|
|
self->ob_type->tp_free(self);
|
|
}
|
|
|
|
static PyObject *
|
|
property_descr_get(PyObject *self, PyObject *obj, PyObject *type)
|
|
{
|
|
propertyobject *gs = (propertyobject *)self;
|
|
|
|
if (obj == NULL || obj == Py_None) {
|
|
Py_INCREF(self);
|
|
return self;
|
|
}
|
|
if (gs->prop_get == NULL) {
|
|
PyErr_SetString(PyExc_AttributeError, "unreadable attribute");
|
|
return NULL;
|
|
}
|
|
return PyObject_CallFunctionObjArgs(gs->prop_get, obj, NULL);
|
|
}
|
|
|
|
static int
|
|
property_descr_set(PyObject *self, PyObject *obj, PyObject *value)
|
|
{
|
|
propertyobject *gs = (propertyobject *)self;
|
|
PyObject *func, *res;
|
|
|
|
if (value == NULL)
|
|
func = gs->prop_del;
|
|
else
|
|
func = gs->prop_set;
|
|
if (func == NULL) {
|
|
PyErr_SetString(PyExc_AttributeError,
|
|
value == NULL ?
|
|
"can't delete attribute" :
|
|
"can't set attribute");
|
|
return -1;
|
|
}
|
|
if (value == NULL)
|
|
res = PyObject_CallFunctionObjArgs(func, obj, NULL);
|
|
else
|
|
res = PyObject_CallFunctionObjArgs(func, obj, value, NULL);
|
|
if (res == NULL)
|
|
return -1;
|
|
Py_DECREF(res);
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *
|
|
property_copy(PyObject *old, PyObject *get, PyObject *set, PyObject *del)
|
|
{
|
|
propertyobject *pold = (propertyobject *)old;
|
|
PyObject *new, *type, *doc;
|
|
|
|
type = PyObject_Type(old);
|
|
if (type == NULL)
|
|
return NULL;
|
|
|
|
if (get == NULL || get == Py_None) {
|
|
Py_XDECREF(get);
|
|
get = pold->prop_get ? pold->prop_get : Py_None;
|
|
}
|
|
if (set == NULL || set == Py_None) {
|
|
Py_XDECREF(set);
|
|
set = pold->prop_set ? pold->prop_set : Py_None;
|
|
}
|
|
if (del == NULL || del == Py_None) {
|
|
Py_XDECREF(del);
|
|
del = pold->prop_del ? pold->prop_del : Py_None;
|
|
}
|
|
if (pold->getter_doc && get != Py_None) {
|
|
/* make _init use __doc__ from getter */
|
|
doc = Py_None;
|
|
}
|
|
else {
|
|
doc = pold->prop_doc ? pold->prop_doc : Py_None;
|
|
}
|
|
|
|
new = PyObject_CallFunction(type, "OOOO", get, set, del, doc);
|
|
Py_DECREF(type);
|
|
if (new == NULL)
|
|
return NULL;
|
|
return new;
|
|
}
|
|
|
|
static int
|
|
property_init(PyObject *self, PyObject *args, PyObject *kwds)
|
|
{
|
|
PyObject *get = NULL, *set = NULL, *del = NULL, *doc = NULL;
|
|
static char *kwlist[] = {"fget", "fset", "fdel", "doc", 0};
|
|
propertyobject *prop = (propertyobject *)self;
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|OOOO:property",
|
|
kwlist, &get, &set, &del, &doc))
|
|
return -1;
|
|
|
|
if (get == Py_None)
|
|
get = NULL;
|
|
if (set == Py_None)
|
|
set = NULL;
|
|
if (del == Py_None)
|
|
del = NULL;
|
|
|
|
Py_XINCREF(get);
|
|
Py_XINCREF(set);
|
|
Py_XINCREF(del);
|
|
Py_XINCREF(doc);
|
|
|
|
prop->prop_get = get;
|
|
prop->prop_set = set;
|
|
prop->prop_del = del;
|
|
prop->prop_doc = doc;
|
|
prop->getter_doc = 0;
|
|
|
|
/* if no docstring given and the getter has one, use that one */
|
|
if ((doc == NULL || doc == Py_None) && get != NULL) {
|
|
_Py_IDENTIFIER(__doc__);
|
|
PyObject *get_doc = _PyObject_GetAttrId(get, &PyId___doc__);
|
|
if (get_doc) {
|
|
if (Py_TYPE(self) == &PyProperty_Type) {
|
|
Py_XDECREF(prop->prop_doc);
|
|
prop->prop_doc = get_doc;
|
|
}
|
|
else {
|
|
/* If this is a property subclass, put __doc__
|
|
in dict of the subclass instance instead,
|
|
otherwise it gets shadowed by __doc__ in the
|
|
class's dict. */
|
|
int err = _PyObject_SetAttrId(self, &PyId___doc__, get_doc);
|
|
Py_DECREF(get_doc);
|
|
if (err < 0)
|
|
return -1;
|
|
}
|
|
prop->getter_doc = 1;
|
|
}
|
|
else if (PyErr_ExceptionMatches(PyExc_Exception)) {
|
|
PyErr_Clear();
|
|
}
|
|
else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
PyDoc_STRVAR(property_doc,
|
|
"property(fget=None, fset=None, fdel=None, doc=None) -> property attribute\n"
|
|
"\n"
|
|
"fget is a function to be used for getting an attribute value, and likewise\n"
|
|
"fset is a function for setting, and fdel a function for del'ing, an\n"
|
|
"attribute. Typical use is to define a managed attribute x:\n"
|
|
"class C(object):\n"
|
|
" def getx(self): return self._x\n"
|
|
" def setx(self, value): self._x = value\n"
|
|
" def delx(self): del self._x\n"
|
|
" x = property(getx, setx, delx, \"I'm the 'x' property.\")\n"
|
|
"\n"
|
|
"Decorators make defining new properties or modifying existing ones easy:\n"
|
|
"class C(object):\n"
|
|
" @property\n"
|
|
" def x(self): return self._x\n"
|
|
" @x.setter\n"
|
|
" def x(self, value): self._x = value\n"
|
|
" @x.deleter\n"
|
|
" def x(self): del self._x\n"
|
|
);
|
|
|
|
static int
|
|
property_traverse(PyObject *self, visitproc visit, void *arg)
|
|
{
|
|
propertyobject *pp = (propertyobject *)self;
|
|
Py_VISIT(pp->prop_get);
|
|
Py_VISIT(pp->prop_set);
|
|
Py_VISIT(pp->prop_del);
|
|
Py_VISIT(pp->prop_doc);
|
|
return 0;
|
|
}
|
|
|
|
PyTypeObject PyProperty_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"property", /* tp_name */
|
|
sizeof(propertyobject), /* tp_basicsize */
|
|
0, /* tp_itemsize */
|
|
/* methods */
|
|
property_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_reserved */
|
|
0, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
0, /* tp_hash */
|
|
0, /* tp_call */
|
|
0, /* tp_str */
|
|
PyObject_GenericGetAttr, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
|
|
Py_TPFLAGS_BASETYPE, /* tp_flags */
|
|
property_doc, /* tp_doc */
|
|
property_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
property_methods, /* tp_methods */
|
|
property_members, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
property_descr_get, /* tp_descr_get */
|
|
property_descr_set, /* tp_descr_set */
|
|
0, /* tp_dictoffset */
|
|
property_init, /* tp_init */
|
|
PyType_GenericAlloc, /* tp_alloc */
|
|
PyType_GenericNew, /* tp_new */
|
|
PyObject_GC_Del, /* tp_free */
|
|
};
|