Mirror
/
cpython
mirror of https://github.com/python/cpython
4
1
Fork 0
Code Issues Releases Wiki Activity
cpython/Objects/descrobject.c

1340 lines
32 KiB
C
Raw Blame History

/* Descriptors -- a new, flexible way to describe attributes */
#include "Python.h"
#include "structmember.h" /* Why is this not included in Python.h? */
static void
descr_dealloc(PyDescrObject *descr)
{
_PyObject_GC_UNTRACK(descr);
Py_XDECREF(descr->d_type);
Py_XDECREF(descr->d_name);
PyObject_GC_Del(descr);
}
static char *
descr_name(PyDescrObject *descr)
{
if (descr->d_name != NULL && PyString_Check(descr->d_name))
return PyString_AS_STRING(descr->d_name);
else
return "?";
}
static PyObject *
descr_repr(PyDescrObject *descr, char *format)
{
return PyString_FromFormat(format, descr_name(descr),
descr->d_type->tp_name);
}
static PyObject *
method_repr(PyMethodDescrObject *descr)
{
return descr_repr((PyDescrObject *)descr,
"<method '%s' of '%s' objects>");
}
static PyObject *
member_repr(PyMemberDescrObject *descr)
{
return descr_repr((PyDescrObject *)descr,
"<member '%s' of '%s' objects>");
}
static PyObject *
getset_repr(PyGetSetDescrObject *descr)
{
return descr_repr((PyDescrObject *)descr,
"<attribute '%s' of '%s' objects>");
}
static PyObject *
wrapperdescr_repr(PyWrapperDescrObject *descr)
{
return descr_repr((PyDescrObject *)descr,
"<slot wrapper '%s' of '%s' objects>");
}
static int
descr_check(PyDescrObject *descr, PyObject *obj, PyObject **pres)
{
if (obj == NULL) {
Py_INCREF(descr);
*pres = (PyObject *)descr;
return 1;
}
if (!PyObject_TypeCheck(obj, descr->d_type)) {
PyErr_Format(PyExc_TypeError,
"descriptor '%s' for '%s' objects "
"doesn't apply to '%s' object",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name,
obj->ob_type->tp_name);
*pres = NULL;
return 1;
}
return 0;
}
static PyObject *
classmethod_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)
{
/* Ensure a valid type. Class methods ignore obj. */
if (type == NULL) {
if (obj != NULL)
type = (PyObject *)obj->ob_type;
else {
/* Wot - no type?! */
PyErr_Format(PyExc_TypeError,
"descriptor '%s' for type '%s' "
"needs either an object or a type",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name);
return NULL;
}
}
if (!PyType_Check(type)) {
PyErr_Format(PyExc_TypeError,
"descriptor '%s' for type '%s' "
"needs a type, not a '%s' as arg 2",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name,
type->ob_type->tp_name);
return NULL;
}
if (!PyType_IsSubtype((PyTypeObject *)type, descr->d_type)) {
PyErr_Format(PyExc_TypeError,
"descriptor '%s' for type '%s' "
"doesn't apply to type '%s'",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name,
((PyTypeObject *)type)->tp_name);
return NULL;
}
return PyCFunction_New(descr->d_method, type);
}
static PyObject *
method_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)
{
PyObject *res;
if (descr_check((PyDescrObject *)descr, obj, &res))
return res;
return PyCFunction_New(descr->d_method, obj);
}
static PyObject *
member_get(PyMemberDescrObject *descr, PyObject *obj, PyObject *type)
{
PyObject *res;
if (descr_check((PyDescrObject *)descr, obj, &res))
return res;
return PyMember_GetOne((char *)obj, descr->d_member);
}
static PyObject *
getset_get(PyGetSetDescrObject *descr, PyObject *obj, PyObject *type)
{
PyObject *res;
if (descr_check((PyDescrObject *)descr, obj, &res))
return res;
if (descr->d_getset->get != NULL)
return descr->d_getset->get(obj, descr->d_getset->closure);
PyErr_Format(PyExc_AttributeError,
"attribute '%.300s' of '%.100s' objects is not readable",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name);
return NULL;
}
static PyObject *
wrapperdescr_get(PyWrapperDescrObject *descr, PyObject *obj, PyObject *type)
{
PyObject *res;
if (descr_check((PyDescrObject *)descr, obj, &res))
return res;
return PyWrapper_New((PyObject *)descr, obj);
}
static int
descr_setcheck(PyDescrObject *descr, PyObject *obj, PyObject *value,
int *pres)
{
assert(obj != NULL);
if (!PyObject_IsInstance(obj, (PyObject *)(descr->d_type))) {
PyErr_Format(PyExc_TypeError,
"descriptor '%.200s' for '%.100s' objects "
"doesn't apply to '%.100s' object",
descr_name(descr),
descr->d_type->tp_name,
obj->ob_type->tp_name);
*pres = -1;
return 1;
}
return 0;
}
static int
member_set(PyMemberDescrObject *descr, PyObject *obj, PyObject *value)
{
int res;
if (descr_setcheck((PyDescrObject *)descr, obj, value, &res))
return res;
return PyMember_SetOne((char *)obj, descr->d_member, value);
}
static int
getset_set(PyGetSetDescrObject *descr, PyObject *obj, PyObject *value)
{
int res;
if (descr_setcheck((PyDescrObject *)descr, obj, value, &res))
return res;
if (descr->d_getset->set != NULL)
return descr->d_getset->set(obj, value,
descr->d_getset->closure);
PyErr_Format(PyExc_AttributeError,
"attribute '%.300s' of '%.100s' objects is not writable",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name);
return -1;
}
static PyObject *
methoddescr_call(PyMethodDescrObject *descr, PyObject *args, PyObject *kwds)
{
Py_ssize_t argc;
PyObject *self, *func, *result;
/* Make sure that the first argument is acceptable as 'self' */
assert(PyTuple_Check(args));
argc = PyTuple_GET_SIZE(args);
if (argc < 1) {
PyErr_Format(PyExc_TypeError,
"descriptor '%.300s' of '%.100s' "
"object needs an argument",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name);
return NULL;
}
self = PyTuple_GET_ITEM(args, 0);
if (!PyObject_IsInstance(self, (PyObject *)(descr->d_type))) {
PyErr_Format(PyExc_TypeError,
"descriptor '%.200s' "
"requires a '%.100s' object "
"but received a '%.100s'",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name,
self->ob_type->tp_name);
return NULL;
}
func = PyCFunction_New(descr->d_method, self);
if (func == NULL)
return NULL;
args = PyTuple_GetSlice(args, 1, argc);
if (args == NULL) {
Py_DECREF(func);
return NULL;
}
result = PyEval_CallObjectWithKeywords(func, args, kwds);
Py_DECREF(args);
Py_DECREF(func);
return result;
}
static PyObject *
classmethoddescr_call(PyMethodDescrObject *descr, PyObject *args,
PyObject *kwds)
{
PyObject *func, *result;
func = PyCFunction_New(descr->d_method, (PyObject *)descr->d_type);
if (func == NULL)
return NULL;
result = PyEval_CallObjectWithKeywords(func, args, kwds);
Py_DECREF(func);
return result;
}
static PyObject *
wrapperdescr_call(PyWrapperDescrObject *descr, PyObject *args, PyObject *kwds)
{
Py_ssize_t argc;
PyObject *self, *func, *result;
/* Make sure that the first argument is acceptable as 'self' */
assert(PyTuple_Check(args));
argc = PyTuple_GET_SIZE(args);
if (argc < 1) {
PyErr_Format(PyExc_TypeError,
"descriptor '%.300s' of '%.100s' "
"object needs an argument",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name);
return NULL;
}
self = PyTuple_GET_ITEM(args, 0);
if (!PyObject_IsInstance(self, (PyObject *)(descr->d_type))) {
PyErr_Format(PyExc_TypeError,
"descriptor '%.200s' "
"requires a '%.100s' object "
"but received a '%.100s'",
descr_name((PyDescrObject *)descr),
descr->d_type->tp_name,
self->ob_type->tp_name);
return NULL;
}
func = PyWrapper_New((PyObject *)descr, self);
if (func == NULL)
return NULL;
args = PyTuple_GetSlice(args, 1, argc);
if (args == NULL) {
Py_DECREF(func);
return NULL;
}
result = PyEval_CallObjectWithKeywords(func, args, kwds);
Py_DECREF(args);
Py_DECREF(func);
return result;
}
static PyObject *
method_get_doc(PyMethodDescrObject *descr, void *closure)
{
if (descr->d_method->ml_doc == NULL) {
Py_INCREF(Py_None);
return Py_None;
}
return PyString_FromString(descr->d_method->ml_doc);
}
static PyMemberDef descr_members[] = {
{"__objclass__", T_OBJECT, offsetof(PyDescrObject, d_type), READONLY},
{"__name__", T_OBJECT, offsetof(PyDescrObject, d_name), READONLY},
{0}
};
static PyGetSetDef method_getset[] = {
{"__doc__", (getter)method_get_doc},
{0}
};
static PyObject *
member_get_doc(PyMemberDescrObject *descr, void *closure)
{
if (descr->d_member->doc == NULL) {
Py_INCREF(Py_None);
return Py_None;
}
return PyString_FromString(descr->d_member->doc);
}
static PyGetSetDef member_getset[] = {
{"__doc__", (getter)member_get_doc},
{0}
};
static PyObject *
getset_get_doc(PyGetSetDescrObject *descr, void *closure)
{
if (descr->d_getset->doc == NULL) {
Py_INCREF(Py_None);
return Py_None;
}
return PyString_FromString(descr->d_getset->doc);
}
static PyGetSetDef getset_getset[] = {
{"__doc__", (getter)getset_get_doc},
{0}
};
static PyObject *
wrapperdescr_get_doc(PyWrapperDescrObject *descr, void *closure)
{
if (descr->d_base->doc == NULL) {
Py_INCREF(Py_None);
return Py_None;
}
return PyString_FromString(descr->d_base->doc);
}
static PyGetSetDef wrapperdescr_getset[] = {
{"__doc__", (getter)wrapperdescr_get_doc},
{0}
};
static int
descr_traverse(PyObject *self, visitproc visit, void *arg)
{
PyDescrObject *descr = (PyDescrObject *)self;
Py_VISIT(descr->d_type);
return 0;
}
static PyTypeObject PyMethodDescr_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"method_descriptor",
sizeof(PyMethodDescrObject),
0,
(destructor)descr_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
(reprfunc)method_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
(ternaryfunc)methoddescr_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 */
method_getset, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
(descrgetfunc)method_get, /* tp_descr_get */
0, /* tp_descr_set */
};
/* This is for METH_CLASS in C, not for "f = classmethod(f)" in Python! */
static PyTypeObject PyClassMethodDescr_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"classmethod_descriptor",
sizeof(PyMethodDescrObject),
0,
(destructor)descr_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
(reprfunc)method_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
(ternaryfunc)classmethoddescr_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 */
method_getset, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
(descrgetfunc)classmethod_get, /* tp_descr_get */
0, /* tp_descr_set */
};
static 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_compare */
(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 */
};
static 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_compare */
(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_compare */
(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 = PyString_InternFromString(name);
if (descr->d_name == NULL) {
Py_DECREF(descr);
descr = 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_has_key(proxyobject *pp, PyObject *key)
{
int res = PyDict_Contains(pp->dict, key);
if (res < 0)
return NULL;
return PyBool_FromLong(res);
}
static PyObject *
proxy_get(proxyobject *pp, PyObject *args)
{
PyObject *key, *def = Py_None;
if (!PyArg_UnpackTuple(args, "get", 1, 2, &key, &def))
return NULL;
return PyObject_CallMethod(pp->dict, "get", "(OO)", key, def);
}
static PyObject *
proxy_keys(proxyobject *pp)
{
return PyMapping_Keys(pp->dict);
}
static PyObject *
proxy_values(proxyobject *pp)
{
return PyMapping_Values(pp->dict);
}
static PyObject *
proxy_items(proxyobject *pp)
{
return PyMapping_Items(pp->dict);
}
static PyObject *
proxy_iterkeys(proxyobject *pp)
{
return PyObject_CallMethod(pp->dict, "iterkeys", NULL);
}
static PyObject *
proxy_itervalues(proxyobject *pp)
{
return PyObject_CallMethod(pp->dict, "itervalues", NULL);
}
static PyObject *
proxy_iteritems(proxyobject *pp)
{
return PyObject_CallMethod(pp->dict, "iteritems", NULL);
}
static PyObject *
proxy_copy(proxyobject *pp)
{
return PyObject_CallMethod(pp->dict, "copy", NULL);
}
static PyMethodDef proxy_methods[] = {
{"has_key", (PyCFunction)proxy_has_key, METH_O,
PyDoc_STR("D.has_key(k) -> True if D has a key k, else False")},
{"get", (PyCFunction)proxy_get, METH_VARARGS,
PyDoc_STR("D.get(k[,d]) -> D[k] if D.has_key(k), 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")},
{"iterkeys", (PyCFunction)proxy_iterkeys, METH_NOARGS,
PyDoc_STR("D.iterkeys() -> an iterator over the keys of D")},
{"itervalues",(PyCFunction)proxy_itervalues, METH_NOARGS,
PyDoc_STR("D.itervalues() -> an iterator over the values of D")},
{"iteritems", (PyCFunction)proxy_iteritems, METH_NOARGS,
PyDoc_STR("D.iteritems() ->"
" an iterator over the (key, value) items of D")},
{"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 int
proxy_traverse(PyObject *self, visitproc visit, void *arg)
{
proxyobject *pp = (proxyobject *)self;
Py_VISIT(pp->dict);
return 0;
}
static int
proxy_compare(proxyobject *v, PyObject *w)
{
return PyObject_Compare(v->dict, w);
}
static PyObject *
proxy_richcompare(proxyobject *v, PyObject *w, int op)
{
return PyObject_RichCompare(v->dict, w, op);
}
static PyTypeObject proxytype = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"dictproxy", /* tp_name */
sizeof(proxyobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)proxy_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
(cmpfunc)proxy_compare, /* tp_compare */
0, /* 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, &proxytype);
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;
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)
}
static int
wrapper_compare(wrapperobject *a, wrapperobject *b)
{
if (a->descr == b->descr)
return PyObject_Compare(a->self, b->self);
else
return (a->descr < b->descr) ? -1 : 1;
}
static long
wrapper_hash(wrapperobject *wp)
{
int 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 PyString_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 *)wp->descr->d_type;
Py_INCREF(c);
return c;
}
static PyObject *
wrapper_name(wrapperobject *wp)
{
char *s = wp->descr->d_base->name;
return PyString_FromString(s);
}
static PyObject *
wrapper_doc(wrapperobject *wp)
{
char *s = wp->descr->d_base->doc;
if (s == NULL) {
Py_INCREF(Py_None);
return Py_None;
}
else {
return PyString_FromString(s);
}
}
static PyGetSetDef wrapper_getsets[] = {
{"__objclass__", (getter)wrapper_objclass},
{"__name__", (getter)wrapper_name},
{"__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;
}
static PyTypeObject wrappertype = {
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 */
(cmpfunc)wrapper_compare, /* tp_compare */
(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 */
0, /* 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_IsInstance(self, (PyObject *)(descr->d_type)));
wp = PyObject_GC_New(wrapperobject, &wrappertype);
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;
} propertyobject;
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.");
PyObject *
property_getter(PyObject *self, PyObject *getter)
{
Py_XDECREF(((propertyobject *)self)->prop_get);
if (getter == Py_None)
getter = NULL;
Py_XINCREF(getter);
((propertyobject *)self)->prop_get = getter;
Py_INCREF(self);
return self;
}
PyDoc_STRVAR(setter_doc,
"Descriptor to change the setter on a property.\n");
PyObject *
property_setter(PyObject *self, PyObject *setter)
{
Py_XDECREF(((propertyobject *)self)->prop_set);
if (setter == Py_None)
setter = NULL;
Py_XINCREF(setter);
((propertyobject *)self)->prop_set = setter;
Py_INCREF(self);
return self;
}
PyDoc_STRVAR(deleter_doc,
"Descriptor to change the deleter on a property.");
PyObject *
property_deleter(PyObject *self, PyObject *deleter)
{
Py_XDECREF(((propertyobject *)self)->prop_del);
if (deleter == Py_None)
deleter = NULL;
Py_XINCREF(deleter);
((propertyobject *)self)->prop_del = deleter;
Py_INCREF(self);
return self;
}
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_CallFunction(gs->prop_get, "(O)", obj);
}
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_CallFunction(func, "(O)", obj);
else
res = PyObject_CallFunction(func, "(OO)", obj, value);
if (res == NULL)
return -1;
Py_DECREF(res);
return 0;
}
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 *gs = (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);
/* if no docstring given and the getter has one, use that one */
if ((doc == NULL || doc == Py_None) && get != NULL) {
PyObject *get_doc = PyObject_GetAttrString(get, "__doc__");
if (get_doc != NULL) {
Py_XDECREF(doc);
doc = get_doc; /* get_doc already INCREF'd by GetAttr */
} else {
PyErr_Clear();
}
}
gs->prop_get = get;
gs->prop_set = set;
gs->prop_del = del;
gs->prop_doc = doc;
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_compare */
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 */
};
Reference in New Issue View Git Blame Copy Permalink