cnpython/Objects/descrobject.c at cnpython · lp9102/cnpython · GitHub

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/* Descriptors -- a new, flexible way to describe attributes */

#include "Python.h"

#include "internal/pystate.h"

#include "structmember.h" /* Why is this not included in Python.h? */

/*[clinic input]

class mappingproxy "mappingproxyobject *" "&PyDictProxy_Type"

class property "propertyobject *" "&PyProperty_Type"

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=556352653fd4c02e]*/

static void

descr_dealloc(PyDescrObject *descr)

{

_PyObject_GC_UNTRACK(descr);

Py_XDECREF(descr->d_type);

Py_XDECREF(descr->d_name);

Py_XDECREF(descr->d_qualname);

PyObject_GC_Del(descr);

}

static PyObject *

descr_name(PyDescrObject *descr)

{

if (descr->d_name != NULL && PyUnicode_Check(descr->d_name))

return descr->d_name;

return NULL;

}

static PyObject *

descr_repr(PyDescrObject *descr, const char *format)

{

PyObject *name = NULL;

if (descr->d_name != NULL && PyUnicode_Check(descr->d_name))

name = descr->d_name;

return PyUnicode_FromFormat(format, name, "?", descr->d_type->tp_name);

}

static PyObject *

method_repr(PyMethodDescrObject *descr)

{

return descr_repr((PyDescrObject *)descr,

"<method '%V' of '%s' objects>");

}

static PyObject *

member_repr(PyMemberDescrObject *descr)

{

return descr_repr((PyDescrObject *)descr,

"<member '%V' of '%s' objects>");

}

static PyObject *

getset_repr(PyGetSetDescrObject *descr)

{

return descr_repr((PyDescrObject *)descr,

"<attribute '%V' of '%s' objects>");

}

static PyObject *

wrapperdescr_repr(PyWrapperDescrObject *descr)

{

return descr_repr((PyDescrObject *)descr,

"<slot wrapper '%V' 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 '%V' 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 '%V' for type '%s' "

"needs either an object or a type",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name);

return NULL;

}

if (!PyType_Check(type)) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' for type '%s' "

"needs a type, not a '%s' as arg 2",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name,

type->ob_type->tp_name);

return NULL;

}

if (!PyType_IsSubtype((PyTypeObject *)type, PyDescr_TYPE(descr))) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' for type '%s' "

"doesn't apply to type '%s'",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name,

((PyTypeObject *)type)->tp_name);

return NULL;

}

return PyCFunction_NewEx(descr->d_method, type, NULL);

}

static PyObject *

method_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)

{

PyObject *res;

if (descr_check((PyDescrObject *)descr, obj, &res))

return res;

return PyCFunction_NewEx(descr->d_method, obj, NULL);

}

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 '%V' of '%.100s' objects is not readable",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->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_TypeCheck(obj, descr->d_type)) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' 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 '%V' of '%.100s' objects is not writable",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name);

return -1;

}

static PyObject *

methoddescr_call(PyMethodDescrObject *descr, PyObject *args, PyObject *kwargs)

{

Py_ssize_t nargs;

PyObject *self, *result;

/* Make sure that the first argument is acceptable as 'self' */

assert(PyTuple_Check(args));

nargs = PyTuple_GET_SIZE(args);

if (nargs < 1) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' of '%.100s' "

"object needs an argument",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name);

return NULL;

}

self = PyTuple_GET_ITEM(args, 0);

if (!_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),

(PyObject *)PyDescr_TYPE(descr))) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' "

"requires a '%.100s' object "

"but received a '%.100s'",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name,

self->ob_type->tp_name);

return NULL;

}

result = _PyMethodDef_RawFastCallDict(descr->d_method, self,

&PyTuple_GET_ITEM(args, 1), nargs - 1,

kwargs);

result = _Py_CheckFunctionResult((PyObject *)descr, result, NULL);

return result;

}

// same to methoddescr_call(), but use FASTCALL convention.

PyObject *

_PyMethodDescr_FastCallKeywords(PyObject *descrobj,

PyObject **args, Py_ssize_t nargs,

PyObject *kwnames)

{

assert(Py_TYPE(descrobj) == &PyMethodDescr_Type);

PyMethodDescrObject *descr = (PyMethodDescrObject *)descrobj;

PyObject *self, *result;

/* Make sure that the first argument is acceptable as 'self' */

if (nargs < 1) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' of '%.100s' "

"object needs an argument",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name);

return NULL;

}

self = args[0];

if (!_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),

(PyObject *)PyDescr_TYPE(descr))) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' "

"requires a '%.100s' object "

"but received a '%.100s'",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name,

self->ob_type->tp_name);

return NULL;

}

result = _PyMethodDef_RawFastCallKeywords(descr->d_method, self,

args+1, nargs-1, kwnames);

result = _Py_CheckFunctionResult((PyObject *)descr, result, NULL);

return result;

}

static PyObject *

classmethoddescr_call(PyMethodDescrObject *descr, PyObject *args,

PyObject *kwds)

{

Py_ssize_t argc;

PyObject *self, *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 '%V' of '%.100s' "

"object needs an argument",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name);

return NULL;

}

self = PyTuple_GET_ITEM(args, 0);

if (!PyType_Check(self)) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' requires a type "

"but received a '%.100s'",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name,

self->ob_type->tp_name);

return NULL;

}

if (!PyType_IsSubtype((PyTypeObject *)self, PyDescr_TYPE(descr))) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' "

"requires a subtype of '%.100s' "

"but received '%.100s",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name,

self->ob_type->tp_name);

return NULL;

}

result = _PyMethodDef_RawFastCallDict(descr->d_method, self,

&PyTuple_GET_ITEM(args, 1), argc - 1,

kwds);

result = _Py_CheckFunctionResult((PyObject *)descr, result, NULL);

return result;

}

Py_LOCAL_INLINE(PyObject *)

wrapperdescr_raw_call(PyWrapperDescrObject *descr, PyObject *self,

PyObject *args, PyObject *kwds)

{

wrapperfunc wrapper = descr->d_base->wrapper;

if (descr->d_base->flags & PyWrapperFlag_KEYWORDS) {

wrapperfunc_kwds wk = (wrapperfunc_kwds)wrapper;

return (*wk)(self, args, descr->d_wrapped, kwds);

}

if (kwds != NULL && (!PyDict_Check(kwds) || PyDict_GET_SIZE(kwds) != 0)) {

PyErr_Format(PyExc_TypeError,

"wrapper %s() takes no keyword arguments",

descr->d_base->name);

return NULL;

}

return (*wrapper)(self, args, descr->d_wrapped);

}

static PyObject *

wrapperdescr_call(PyWrapperDescrObject *descr, PyObject *args, PyObject *kwds)

{

Py_ssize_t argc;

PyObject *self, *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 '%V' of '%.100s' "

"object needs an argument",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name);

return NULL;

}

self = PyTuple_GET_ITEM(args, 0);

if (!_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),

(PyObject *)PyDescr_TYPE(descr))) {

PyErr_Format(PyExc_TypeError,

"descriptor '%V' "

"requires a '%.100s' object "

"but received a '%.100s'",

descr_name((PyDescrObject *)descr), "?",

PyDescr_TYPE(descr)->tp_name,

self->ob_type->tp_name);

return NULL;

}

args = PyTuple_GetSlice(args, 1, argc);

if (args == NULL) {

return NULL;

}

result = wrapperdescr_raw_call(descr, self, args, kwds);

Py_DECREF(args);

return result;

}

static PyObject *

method_get_doc(PyMethodDescrObject *descr, void *closure)

{

return _PyType_GetDocFromInternalDoc(descr->d_method->ml_name, descr->d_method->ml_doc);

}

static PyObject *

method_get_text_signature(PyMethodDescrObject *descr, void *closure)

{

return _PyType_GetTextSignatureFromInternalDoc(descr->d_method->ml_name, descr->d_method->ml_doc);

}

static PyObject *

calculate_qualname(PyDescrObject *descr)

{

PyObject *type_qualname, *res;

_Py_IDENTIFIER(__qualname__);

if (descr->d_name == NULL || !PyUnicode_Check(descr->d_name)) {

PyErr_SetString(PyExc_TypeError,

"<descriptor>.__name__ is not a unicode object");

return NULL;

}

type_qualname = _PyObject_GetAttrId((PyObject *)descr->d_type,

&PyId___qualname__);

if (type_qualname == NULL)

return NULL;

if (!PyUnicode_Check(type_qualname)) {

PyErr_SetString(PyExc_TypeError, "<descriptor>.__objclass__."

"__qualname__ is not a unicode object");

Py_XDECREF(type_qualname);

return NULL;

}

res = PyUnicode_FromFormat("%S.%S", type_qualname, descr->d_name);

Py_DECREF(type_qualname);

return res;

}

static PyObject *

descr_get_qualname(PyDescrObject *descr)

{

if (descr->d_qualname == NULL)

descr->d_qualname = calculate_qualname(descr);

Py_XINCREF(descr->d_qualname);

return descr->d_qualname;

}

static PyObject *

descr_reduce(PyDescrObject *descr)

{

PyObject *builtins;

PyObject *getattr;

_Py_IDENTIFIER(getattr);

builtins = PyEval_GetBuiltins();

getattr = _PyDict_GetItemId(builtins, &PyId_getattr);

return Py_BuildValue("O(OO)", getattr, PyDescr_TYPE(descr),

PyDescr_NAME(descr));

}

static PyMethodDef descr_methods[] = {

{"__reduce__", (PyCFunction)descr_reduce, METH_NOARGS, NULL},

{NULL, NULL}

};

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},

{"__qualname__", (getter)descr_get_qualname},

{"__text_signature__", (getter)method_get_text_signature},

{0}

};

static PyObject *

member_get_doc(PyMemberDescrObject *descr, void *closure)

{

if (descr->d_member->doc == NULL) {

Py_RETURN_NONE;

}

return PyUnicode_FromString(descr->d_member->doc);

}

static PyGetSetDef member_getset[] = {

{"__doc__", (getter)member_get_doc},

{"__qualname__", (getter)descr_get_qualname},

{0}

};

static PyObject *

getset_get_doc(PyGetSetDescrObject *descr, void *closure)

{

if (descr->d_getset->doc == NULL) {

Py_RETURN_NONE;

}

return PyUnicode_FromString(descr->d_getset->doc);

}

static PyGetSetDef getset_getset[] = {

{"__doc__", (getter)getset_get_doc},

{"__qualname__", (getter)descr_get_qualname},

{0}

};

static PyObject *

wrapperdescr_get_doc(PyWrapperDescrObject *descr, void *closure)

{

return _PyType_GetDocFromInternalDoc(descr->d_base->name, descr->d_base->doc);

}

static PyObject *

wrapperdescr_get_text_signature(PyWrapperDescrObject *descr, void *closure)

{

return _PyType_GetTextSignatureFromInternalDoc(descr->d_base->name, descr->d_base->doc);

}

static PyGetSetDef wrapperdescr_getset[] = {

{"__doc__", (getter)wrapperdescr_get_doc},

{"__qualname__", (getter)descr_get_qualname},

{"__text_signature__", (getter)wrapperdescr_get_text_signature},

{0}

};

static int

descr_traverse(PyObject *self, visitproc visit, void *arg)

{

PyDescrObject *descr = (PyDescrObject *)self;

Py_VISIT(descr->d_type);

return 0;

}

PyTypeObject PyMethodDescr_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"method_descriptor",

sizeof(PyMethodDescrObject),

(destructor)descr_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

(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 */

descr_methods, /* 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! */

PyTypeObject PyClassMethodDescr_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"classmethod_descriptor",

sizeof(PyMethodDescrObject),

(destructor)descr_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

(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 */

descr_methods, /* 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 */

};

PyTypeObject PyMemberDescr_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"member_descriptor",

sizeof(PyMemberDescrObject),

(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 */

descr_methods, /* 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),

(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),

(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 */

descr_methods, /* 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;

}

else {

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;

}

/* --- mappingproxy: read-only proxy for mappings --- */

/* 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 *mapping;

} mappingproxyobject;

static Py_ssize_t

mappingproxy_len(mappingproxyobject *pp)

{

return PyObject_Size(pp->mapping);

}

static PyObject *

mappingproxy_getitem(mappingproxyobject *pp, PyObject *key)

{

return PyObject_GetItem(pp->mapping, key);

}

static PyMappingMethods mappingproxy_as_mapping = {

(lenfunc)mappingproxy_len, /* mp_length */

(binaryfunc)mappingproxy_getitem, /* mp_subscript */

0, /* mp_ass_subscript */

};

static int

mappingproxy_contains(mappingproxyobject *pp, PyObject *key)

{

if (PyDict_CheckExact(pp->mapping))

return PyDict_Contains(pp->mapping, key);

else

return PySequence_Contains(pp->mapping, key);

}

static PySequenceMethods mappingproxy_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)mappingproxy_contains, /* sq_contains */

0, /* sq_inplace_concat */

0, /* sq_inplace_repeat */

};

static PyObject *

mappingproxy_get(mappingproxyobject *pp, PyObject *args)

{

PyObject *key, *def = Py_None;

_Py_IDENTIFIER(get);

if (!PyArg_UnpackTuple(args, "get", 1, 2, &key, &def))

return NULL;

return _PyObject_CallMethodIdObjArgs(pp->mapping, &PyId_get,

key, def, NULL);

}

static PyObject *

mappingproxy_keys(mappingproxyobject *pp)

{

_Py_IDENTIFIER(keys);

return _PyObject_CallMethodId(pp->mapping, &PyId_keys, NULL);

}

static PyObject *

mappingproxy_values(mappingproxyobject *pp)

{

_Py_IDENTIFIER(values);

return _PyObject_CallMethodId(pp->mapping, &PyId_values, NULL);

}

static PyObject *

mappingproxy_items(mappingproxyobject *pp)

{

_Py_IDENTIFIER(items);

return _PyObject_CallMethodId(pp->mapping, &PyId_items, NULL);

}

static PyObject *

mappingproxy_copy(mappingproxyobject *pp)

{

_Py_IDENTIFIER(copy);

return _PyObject_CallMethodId(pp->mapping, &PyId_copy, NULL);

}

/* WARNING: mappingproxy methods must not give access

to the underlying mapping */

static PyMethodDef mappingproxy_methods[] = {

{"get", (PyCFunction)mappingproxy_get, METH_VARARGS,

PyDoc_STR("D.get(k[,d]) -> D[k] if k in D, else d."

" d defaults to None.")},

{"keys", (PyCFunction)mappingproxy_keys, METH_NOARGS,

PyDoc_STR("D.keys() -> list of D's keys")},

{"values", (PyCFunction)mappingproxy_values, METH_NOARGS,

PyDoc_STR("D.values() -> list of D's values")},

{"items", (PyCFunction)mappingproxy_items, METH_NOARGS,

PyDoc_STR("D.items() -> list of D's (key, value) pairs, as 2-tuples")},

{"copy", (PyCFunction)mappingproxy_copy, METH_NOARGS,

PyDoc_STR("D.copy() -> a shallow copy of D")},

{0}

};

static void

mappingproxy_dealloc(mappingproxyobject *pp)

{

_PyObject_GC_UNTRACK(pp);

Py_DECREF(pp->mapping);

PyObject_GC_Del(pp);

}

static PyObject *

mappingproxy_getiter(mappingproxyobject *pp)

{

return PyObject_GetIter(pp->mapping);

}

static PyObject *

mappingproxy_str(mappingproxyobject *pp)

{

return PyObject_Str(pp->mapping);

}

static PyObject *

mappingproxy_repr(mappingproxyobject *pp)

{

return PyUnicode_FromFormat("mappingproxy(%R)", pp->mapping);

}

static int

mappingproxy_traverse(PyObject *self, visitproc visit, void *arg)

{

mappingproxyobject *pp = (mappingproxyobject *)self;

Py_VISIT(pp->mapping);

return 0;

}

static PyObject *

mappingproxy_richcompare(mappingproxyobject *v, PyObject *w, int op)

{

return PyObject_RichCompare(v->mapping, w, op);

}

static int

mappingproxy_check_mapping(PyObject *mapping)

{

if (!PyMapping_Check(mapping)

|| PyList_Check(mapping)

|| PyTuple_Check(mapping)) {

PyErr_Format(PyExc_TypeError,

"mappingproxy() argument must be a mapping, not %s",

Py_TYPE(mapping)->tp_name);

return -1;

}

return 0;

}

/*[clinic input]

@classmethod

mappingproxy.__new__ as mappingproxy_new

mapping: object

[clinic start generated code]*/

static PyObject *

mappingproxy_new_impl(PyTypeObject *type, PyObject *mapping)

/*[clinic end generated code: output=65f27f02d5b68fa7 input=d2d620d4f598d4f8]*/

{

mappingproxyobject *mappingproxy;

if (mappingproxy_check_mapping(mapping) == -1)

return NULL;

mappingproxy = PyObject_GC_New(mappingproxyobject, &PyDictProxy_Type);

if (mappingproxy == NULL)

return NULL;

Py_INCREF(mapping);

mappingproxy->mapping = mapping;

_PyObject_GC_TRACK(mappingproxy);

return (PyObject *)mappingproxy;

}

PyObject *

PyDictProxy_New(PyObject *mapping)

{

mappingproxyobject *pp;

View remainder of file in raw view

cnpython/Objects/descrobject.c at cnpython · lp9102/cnpython · GitHub

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