cpython/Objects/unionobject.c at doc-link-https · 180909/cpython · GitHub

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// types.UnionType -- used to represent e.g. Union[int, str], int | str

#include "Python.h"

#include "pycore_object.h" // _PyObject_GC_TRACK/UNTRACK

#include "pycore_unionobject.h"

#include "structmember.h"

static PyObject *make_union(PyObject *);

typedef struct {

PyObject_HEAD

PyObject *args;

PyObject *parameters;

} unionobject;

static void

unionobject_dealloc(PyObject *self)

{

unionobject *alias = (unionobject *)self;

_PyObject_GC_UNTRACK(self);

Py_XDECREF(alias->args);

Py_XDECREF(alias->parameters);

Py_TYPE(self)->tp_free(self);

}

static int

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

{

unionobject *alias = (unionobject *)self;

Py_VISIT(alias->args);

Py_VISIT(alias->parameters);

return 0;

}

static Py_hash_t

union_hash(PyObject *self)

{

unionobject *alias = (unionobject *)self;

PyObject *args = PyFrozenSet_New(alias->args);

if (args == NULL) {

return (Py_hash_t)-1;

}

Py_hash_t hash = PyObject_Hash(args);

Py_DECREF(args);

return hash;

}

static PyObject *

union_richcompare(PyObject *a, PyObject *b, int op)

{

if (!_PyUnion_Check(b) || (op != Py_EQ && op != Py_NE)) {

Py_RETURN_NOTIMPLEMENTED;

}

PyObject *a_set = PySet_New(((unionobject*)a)->args);

if (a_set == NULL) {

return NULL;

}

PyObject *b_set = PySet_New(((unionobject*)b)->args);

if (b_set == NULL) {

Py_DECREF(a_set);

return NULL;

}

PyObject *result = PyObject_RichCompare(a_set, b_set, op);

Py_DECREF(b_set);

Py_DECREF(a_set);

return result;

}

static int

is_same(PyObject *left, PyObject *right)

{

int is_ga = _PyGenericAlias_Check(left) && _PyGenericAlias_Check(right);

return is_ga ? PyObject_RichCompareBool(left, right, Py_EQ) : left == right;

}

static int

contains(PyObject **items, Py_ssize_t size, PyObject *obj)

{

for (int i = 0; i < size; i++) {

int is_duplicate = is_same(items[i], obj);

if (is_duplicate) { // -1 or 1

return is_duplicate;

}

return 0;

}

static PyObject *

merge(PyObject **items1, Py_ssize_t size1,

PyObject **items2, Py_ssize_t size2)

{

PyObject *tuple = NULL;

Py_ssize_t pos = 0;

for (int i = 0; i < size2; i++) {

PyObject *arg = items2[i];

int is_duplicate = contains(items1, size1, arg);

if (is_duplicate < 0) {

Py_XDECREF(tuple);

return NULL;

}

if (is_duplicate) {

continue;

}

if (tuple == NULL) {

tuple = PyTuple_New(size1 + size2 - i);

if (tuple == NULL) {

return NULL;

}

for (; pos < size1; pos++) {

PyObject *a = items1[pos];

Py_INCREF(a);

PyTuple_SET_ITEM(tuple, pos, a);

}

Py_INCREF(arg);

PyTuple_SET_ITEM(tuple, pos, arg);

pos++;

}

if (tuple) {

(void) _PyTuple_Resize(&tuple, pos);

}

return tuple;

}

static PyObject **

get_types(PyObject **obj, Py_ssize_t *size)

{

if (*obj == Py_None) {

*obj = (PyObject *)&_PyNone_Type;

}

if (_PyUnion_Check(*obj)) {

PyObject *args = ((unionobject *) *obj)->args;

*size = PyTuple_GET_SIZE(args);

return &PyTuple_GET_ITEM(args, 0);

}

else {

*size = 1;

return obj;

}

static int

is_unionable(PyObject *obj)

{

return (obj == Py_None ||

PyType_Check(obj) ||

_PyGenericAlias_Check(obj) ||

_PyUnion_Check(obj));

}

PyObject *

_Py_union_type_or(PyObject* self, PyObject* other)

{

if (!is_unionable(self) || !is_unionable(other)) {

Py_RETURN_NOTIMPLEMENTED;

}

Py_ssize_t size1, size2;

PyObject **items1 = get_types(&self, &size1);

PyObject **items2 = get_types(&other, &size2);

PyObject *tuple = merge(items1, size1, items2, size2);

if (tuple == NULL) {

if (PyErr_Occurred()) {

return NULL;

}

Py_INCREF(self);

return self;

}

PyObject *new_union = make_union(tuple);

Py_DECREF(tuple);

return new_union;

}

static int

union_repr_item(_PyUnicodeWriter *writer, PyObject *p)

{

PyObject *qualname = NULL;

PyObject *module = NULL;

PyObject *tmp;

PyObject *r = NULL;

int err;

if (p == (PyObject *)&_PyNone_Type) {

return _PyUnicodeWriter_WriteASCIIString(writer, "None", 4);

}

if (_PyObject_LookupAttr(p, &_Py_ID(__origin__), &tmp) < 0) {

goto exit;

}

if (tmp) {

Py_DECREF(tmp);

if (_PyObject_LookupAttr(p, &_Py_ID(__args__), &tmp) < 0) {

goto exit;

}

if (tmp) {

// It looks like a GenericAlias

Py_DECREF(tmp);

goto use_repr;

}

if (_PyObject_LookupAttr(p, &_Py_ID(__qualname__), &qualname) < 0) {

goto exit;

}

if (qualname == NULL) {

goto use_repr;

}

if (_PyObject_LookupAttr(p, &_Py_ID(__module__), &module) < 0) {

goto exit;

}

if (module == NULL || module == Py_None) {

goto use_repr;

}

// Looks like a class

if (PyUnicode_Check(module) &&

_PyUnicode_EqualToASCIIString(module, "builtins"))

{

// builtins don't need a module name

r = PyObject_Str(qualname);

goto exit;

}

else {

r = PyUnicode_FromFormat("%S.%S", module, qualname);

goto exit;

}

use_repr:

r = PyObject_Repr(p);

exit:

Py_XDECREF(qualname);

Py_XDECREF(module);

if (r == NULL) {

return -1;

}

err = _PyUnicodeWriter_WriteStr(writer, r);

Py_DECREF(r);

return err;

}

static PyObject *

union_repr(PyObject *self)

{

unionobject *alias = (unionobject *)self;

Py_ssize_t len = PyTuple_GET_SIZE(alias->args);

_PyUnicodeWriter writer;

_PyUnicodeWriter_Init(&writer);

for (Py_ssize_t i = 0; i < len; i++) {

if (i > 0 && _PyUnicodeWriter_WriteASCIIString(&writer, " | ", 3) < 0) {

goto error;

}

PyObject *p = PyTuple_GET_ITEM(alias->args, i);

if (union_repr_item(&writer, p) < 0) {

goto error;

}

return _PyUnicodeWriter_Finish(&writer);

error:

_PyUnicodeWriter_Dealloc(&writer);

return NULL;

}

static PyMemberDef union_members[] = {

{"__args__", T_OBJECT, offsetof(unionobject, args), READONLY},

{0}

};

static PyObject *

union_getitem(PyObject *self, PyObject *item)

{

unionobject *alias = (unionobject *)self;

// Populate __parameters__ if needed.

if (alias->parameters == NULL) {

alias->parameters = _Py_make_parameters(alias->args);

if (alias->parameters == NULL) {

return NULL;

}

PyObject *newargs = _Py_subs_parameters(self, alias->args, alias->parameters, item);

if (newargs == NULL) {

return NULL;

}

PyObject *res;

Py_ssize_t nargs = PyTuple_GET_SIZE(newargs);

if (nargs == 0) {

res = make_union(newargs);

}

else {

res = PyTuple_GET_ITEM(newargs, 0);

Py_INCREF(res);

for (Py_ssize_t iarg = 1; iarg < nargs; iarg++) {

PyObject *arg = PyTuple_GET_ITEM(newargs, iarg);

Py_SETREF(res, PyNumber_Or(res, arg));

if (res == NULL) {

break;

}

Py_DECREF(newargs);

return res;

}

static PyMappingMethods union_as_mapping = {

.mp_subscript = union_getitem,

};

static PyObject *

union_parameters(PyObject *self, void *Py_UNUSED(unused))

{

unionobject *alias = (unionobject *)self;

if (alias->parameters == NULL) {

alias->parameters = _Py_make_parameters(alias->args);

if (alias->parameters == NULL) {

return NULL;

}

Py_INCREF(alias->parameters);

return alias->parameters;

}

static PyGetSetDef union_properties[] = {

{"__parameters__", union_parameters, (setter)NULL, "Type variables in the types.UnionType.", NULL},

{0}

};

static PyNumberMethods union_as_number = {

.nb_or = _Py_union_type_or, // Add __or__ function

};

static const char* const cls_attrs[] = {

"__module__", // Required for compatibility with typing module

NULL,

};

static PyObject *

union_getattro(PyObject *self, PyObject *name)

{

unionobject *alias = (unionobject *)self;

if (PyUnicode_Check(name)) {

for (const char * const *p = cls_attrs; ; p++) {

if (*p == NULL) {

break;

}

if (_PyUnicode_EqualToASCIIString(name, *p)) {

return PyObject_GetAttr((PyObject *) Py_TYPE(alias), name);

}

return PyObject_GenericGetAttr(self, name);

}

PyObject *

_Py_union_args(PyObject *self)

{

assert(_PyUnion_Check(self));

return ((unionobject *) self)->args;

}

PyTypeObject _PyUnion_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

.tp_name = "types.UnionType",

.tp_doc = PyDoc_STR("Represent a PEP 604 union type\n"

"\n"

"E.g. for int | str"),

.tp_basicsize = sizeof(unionobject),

.tp_dealloc = unionobject_dealloc,

.tp_alloc = PyType_GenericAlloc,

.tp_free = PyObject_GC_Del,

.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,

.tp_traverse = union_traverse,

.tp_hash = union_hash,

.tp_getattro = union_getattro,

.tp_members = union_members,

.tp_richcompare = union_richcompare,

.tp_as_mapping = &union_as_mapping,

.tp_as_number = &union_as_number,

.tp_repr = union_repr,

.tp_getset = union_properties,

};

static PyObject *

make_union(PyObject *args)

{

assert(PyTuple_CheckExact(args));

unionobject *result = PyObject_GC_New(unionobject, &_PyUnion_Type);

if (result == NULL) {

return NULL;

}

Py_INCREF(args);

result->parameters = NULL;

result->args = args;

_PyObject_GC_TRACK(result);

return (PyObject*)result;

}

cpython/Objects/unionobject.c at doc-link-https · 180909/cpython · GitHub

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