mirror of
https://github.com/python/cpython
synced 2024-07-21 10:15:53 +00:00
add16f1a5e
Add the following functions: * PyObject_HasAttrWithError() * PyObject_HasAttrStringWithError() * PyMapping_HasKeyWithError() * PyMapping_HasKeyStringWithError()
402 lines
9.7 KiB
C
402 lines
9.7 KiB
C
// types.UnionType -- used to represent e.g. Union[int, str], int | str
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#include "Python.h"
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#include "pycore_object.h" // _PyObject_GC_TRACK/UNTRACK
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#include "pycore_typevarobject.h" // _PyTypeAlias_Type
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#include "pycore_unionobject.h"
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static PyObject *make_union(PyObject *);
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typedef struct {
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PyObject_HEAD
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PyObject *args;
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PyObject *parameters;
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} unionobject;
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static void
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unionobject_dealloc(PyObject *self)
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{
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unionobject *alias = (unionobject *)self;
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_PyObject_GC_UNTRACK(self);
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Py_XDECREF(alias->args);
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Py_XDECREF(alias->parameters);
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Py_TYPE(self)->tp_free(self);
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}
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static int
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union_traverse(PyObject *self, visitproc visit, void *arg)
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{
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unionobject *alias = (unionobject *)self;
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Py_VISIT(alias->args);
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Py_VISIT(alias->parameters);
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return 0;
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}
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static Py_hash_t
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union_hash(PyObject *self)
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{
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unionobject *alias = (unionobject *)self;
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PyObject *args = PyFrozenSet_New(alias->args);
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if (args == NULL) {
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return (Py_hash_t)-1;
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}
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Py_hash_t hash = PyObject_Hash(args);
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Py_DECREF(args);
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return hash;
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}
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static PyObject *
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union_richcompare(PyObject *a, PyObject *b, int op)
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{
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if (!_PyUnion_Check(b) || (op != Py_EQ && op != Py_NE)) {
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Py_RETURN_NOTIMPLEMENTED;
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}
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PyObject *a_set = PySet_New(((unionobject*)a)->args);
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if (a_set == NULL) {
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return NULL;
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}
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PyObject *b_set = PySet_New(((unionobject*)b)->args);
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if (b_set == NULL) {
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Py_DECREF(a_set);
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return NULL;
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}
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PyObject *result = PyObject_RichCompare(a_set, b_set, op);
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Py_DECREF(b_set);
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Py_DECREF(a_set);
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return result;
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}
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static int
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is_same(PyObject *left, PyObject *right)
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{
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int is_ga = _PyGenericAlias_Check(left) && _PyGenericAlias_Check(right);
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return is_ga ? PyObject_RichCompareBool(left, right, Py_EQ) : left == right;
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}
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static int
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contains(PyObject **items, Py_ssize_t size, PyObject *obj)
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{
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for (int i = 0; i < size; i++) {
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int is_duplicate = is_same(items[i], obj);
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if (is_duplicate) { // -1 or 1
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return is_duplicate;
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}
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}
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return 0;
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}
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static PyObject *
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merge(PyObject **items1, Py_ssize_t size1,
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PyObject **items2, Py_ssize_t size2)
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{
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PyObject *tuple = NULL;
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Py_ssize_t pos = 0;
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for (int i = 0; i < size2; i++) {
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PyObject *arg = items2[i];
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int is_duplicate = contains(items1, size1, arg);
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if (is_duplicate < 0) {
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Py_XDECREF(tuple);
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return NULL;
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}
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if (is_duplicate) {
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continue;
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}
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if (tuple == NULL) {
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tuple = PyTuple_New(size1 + size2 - i);
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if (tuple == NULL) {
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return NULL;
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}
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for (; pos < size1; pos++) {
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PyObject *a = items1[pos];
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PyTuple_SET_ITEM(tuple, pos, Py_NewRef(a));
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}
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}
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PyTuple_SET_ITEM(tuple, pos, Py_NewRef(arg));
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pos++;
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}
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if (tuple) {
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(void) _PyTuple_Resize(&tuple, pos);
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}
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return tuple;
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}
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static PyObject **
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get_types(PyObject **obj, Py_ssize_t *size)
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{
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if (*obj == Py_None) {
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*obj = (PyObject *)&_PyNone_Type;
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}
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if (_PyUnion_Check(*obj)) {
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PyObject *args = ((unionobject *) *obj)->args;
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*size = PyTuple_GET_SIZE(args);
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return &PyTuple_GET_ITEM(args, 0);
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}
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else {
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*size = 1;
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return obj;
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}
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}
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static int
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is_unionable(PyObject *obj)
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{
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if (obj == Py_None ||
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PyType_Check(obj) ||
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_PyGenericAlias_Check(obj) ||
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_PyUnion_Check(obj) ||
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Py_IS_TYPE(obj, &_PyTypeAlias_Type)) {
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return 1;
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}
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return 0;
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}
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PyObject *
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_Py_union_type_or(PyObject* self, PyObject* other)
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{
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if (!is_unionable(self) || !is_unionable(other)) {
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Py_RETURN_NOTIMPLEMENTED;
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}
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Py_ssize_t size1, size2;
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PyObject **items1 = get_types(&self, &size1);
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PyObject **items2 = get_types(&other, &size2);
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PyObject *tuple = merge(items1, size1, items2, size2);
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if (tuple == NULL) {
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if (PyErr_Occurred()) {
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return NULL;
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}
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return Py_NewRef(self);
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}
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PyObject *new_union = make_union(tuple);
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Py_DECREF(tuple);
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return new_union;
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}
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static int
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union_repr_item(_PyUnicodeWriter *writer, PyObject *p)
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{
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PyObject *qualname = NULL;
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PyObject *module = NULL;
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PyObject *r = NULL;
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int rc;
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if (p == (PyObject *)&_PyNone_Type) {
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return _PyUnicodeWriter_WriteASCIIString(writer, "None", 4);
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}
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if ((rc = PyObject_HasAttrWithError(p, &_Py_ID(__origin__))) > 0 &&
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(rc = PyObject_HasAttrWithError(p, &_Py_ID(__args__))) > 0)
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{
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// It looks like a GenericAlias
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goto use_repr;
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}
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if (rc < 0) {
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goto exit;
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}
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if (PyObject_GetOptionalAttr(p, &_Py_ID(__qualname__), &qualname) < 0) {
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goto exit;
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}
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if (qualname == NULL) {
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goto use_repr;
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}
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if (PyObject_GetOptionalAttr(p, &_Py_ID(__module__), &module) < 0) {
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goto exit;
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}
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if (module == NULL || module == Py_None) {
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goto use_repr;
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}
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// Looks like a class
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if (PyUnicode_Check(module) &&
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_PyUnicode_EqualToASCIIString(module, "builtins"))
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{
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// builtins don't need a module name
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r = PyObject_Str(qualname);
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goto exit;
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}
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else {
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r = PyUnicode_FromFormat("%S.%S", module, qualname);
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goto exit;
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}
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use_repr:
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r = PyObject_Repr(p);
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exit:
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Py_XDECREF(qualname);
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Py_XDECREF(module);
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if (r == NULL) {
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return -1;
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}
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rc = _PyUnicodeWriter_WriteStr(writer, r);
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Py_DECREF(r);
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return rc;
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}
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static PyObject *
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union_repr(PyObject *self)
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{
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unionobject *alias = (unionobject *)self;
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Py_ssize_t len = PyTuple_GET_SIZE(alias->args);
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_PyUnicodeWriter writer;
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_PyUnicodeWriter_Init(&writer);
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for (Py_ssize_t i = 0; i < len; i++) {
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if (i > 0 && _PyUnicodeWriter_WriteASCIIString(&writer, " | ", 3) < 0) {
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goto error;
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}
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PyObject *p = PyTuple_GET_ITEM(alias->args, i);
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if (union_repr_item(&writer, p) < 0) {
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goto error;
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}
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}
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return _PyUnicodeWriter_Finish(&writer);
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error:
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_PyUnicodeWriter_Dealloc(&writer);
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return NULL;
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}
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static PyMemberDef union_members[] = {
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{"__args__", _Py_T_OBJECT, offsetof(unionobject, args), Py_READONLY},
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{0}
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};
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static PyObject *
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union_getitem(PyObject *self, PyObject *item)
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{
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unionobject *alias = (unionobject *)self;
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// Populate __parameters__ if needed.
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if (alias->parameters == NULL) {
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alias->parameters = _Py_make_parameters(alias->args);
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if (alias->parameters == NULL) {
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return NULL;
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}
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}
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PyObject *newargs = _Py_subs_parameters(self, alias->args, alias->parameters, item);
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if (newargs == NULL) {
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return NULL;
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}
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PyObject *res;
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Py_ssize_t nargs = PyTuple_GET_SIZE(newargs);
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if (nargs == 0) {
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res = make_union(newargs);
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}
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else {
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res = Py_NewRef(PyTuple_GET_ITEM(newargs, 0));
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for (Py_ssize_t iarg = 1; iarg < nargs; iarg++) {
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PyObject *arg = PyTuple_GET_ITEM(newargs, iarg);
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Py_SETREF(res, PyNumber_Or(res, arg));
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if (res == NULL) {
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break;
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}
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}
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}
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Py_DECREF(newargs);
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return res;
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}
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static PyMappingMethods union_as_mapping = {
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.mp_subscript = union_getitem,
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};
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static PyObject *
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union_parameters(PyObject *self, void *Py_UNUSED(unused))
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{
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unionobject *alias = (unionobject *)self;
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if (alias->parameters == NULL) {
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alias->parameters = _Py_make_parameters(alias->args);
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if (alias->parameters == NULL) {
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return NULL;
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}
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}
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return Py_NewRef(alias->parameters);
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}
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static PyGetSetDef union_properties[] = {
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{"__parameters__", union_parameters, (setter)NULL,
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PyDoc_STR("Type variables in the types.UnionType."), NULL},
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{0}
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};
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static PyNumberMethods union_as_number = {
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.nb_or = _Py_union_type_or, // Add __or__ function
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};
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static const char* const cls_attrs[] = {
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"__module__", // Required for compatibility with typing module
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NULL,
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};
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static PyObject *
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union_getattro(PyObject *self, PyObject *name)
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{
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unionobject *alias = (unionobject *)self;
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if (PyUnicode_Check(name)) {
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for (const char * const *p = cls_attrs; ; p++) {
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if (*p == NULL) {
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break;
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}
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if (_PyUnicode_EqualToASCIIString(name, *p)) {
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return PyObject_GetAttr((PyObject *) Py_TYPE(alias), name);
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}
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}
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}
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return PyObject_GenericGetAttr(self, name);
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}
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PyObject *
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_Py_union_args(PyObject *self)
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{
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assert(_PyUnion_Check(self));
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return ((unionobject *) self)->args;
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}
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PyTypeObject _PyUnion_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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.tp_name = "types.UnionType",
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.tp_doc = PyDoc_STR("Represent a PEP 604 union type\n"
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"\n"
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"E.g. for int | str"),
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.tp_basicsize = sizeof(unionobject),
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.tp_dealloc = unionobject_dealloc,
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.tp_alloc = PyType_GenericAlloc,
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.tp_free = PyObject_GC_Del,
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.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
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.tp_traverse = union_traverse,
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.tp_hash = union_hash,
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.tp_getattro = union_getattro,
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.tp_members = union_members,
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.tp_richcompare = union_richcompare,
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.tp_as_mapping = &union_as_mapping,
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.tp_as_number = &union_as_number,
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.tp_repr = union_repr,
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.tp_getset = union_properties,
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};
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static PyObject *
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make_union(PyObject *args)
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{
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assert(PyTuple_CheckExact(args));
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unionobject *result = PyObject_GC_New(unionobject, &_PyUnion_Type);
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if (result == NULL) {
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return NULL;
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}
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result->parameters = NULL;
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result->args = Py_NewRef(args);
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_PyObject_GC_TRACK(result);
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return (PyObject*)result;
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}
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