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pure.c: custom getsetters

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Ciro Santilli 六四事件 法轮功
2020-02-26 00:00:04 +00:00
parent 9f934c7cd6
commit 37c25541c7
3 changed files with 326 additions and 55 deletions
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212
userland/libs/python_embed/pure_cpp.cpp
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@@ -4,6 +4,8 @@
#include <Python.h>
#include "structmember.h"
#include <string>
/* Define a function in C to be accessible from the Python code.
*
* ....
@@ -33,32 +35,46 @@ static PyMethodDef my_native_methods[] = {
};
/* Define a class in C to be accessible from the Python code.
*
* AKA how to write 20 lines of Python in 200 lines of C.
*
* ....
* class MyNativeClass:
*
* def __init__(self, first='', last='', number=0):
* self.first = first
* self.last = last
* self.number = number
*
* def name(self):
* return '{} {}'.format(self.first, self.last)
*
* class MyDerivedNativeClass(MyNativeClass):
*
* def __init__(self, first='', last='', number=0, first2='', last2='', number2=0):
* super().__init__(first, last, number, number)
* self.first2 = first2
* self.last2 = last2
* self.number2 = number2
*
* def name(self):
* return '{} {} {} {} 2'.format(self.first, self.last, self.first2, self.last2)
* and bind data and methods it to a C++ class!
* ....
*/
struct MyNativeClass {
std::string first;
std::string last;
int number;
MyNativeClass(
const std::string& first,
const std::string& last,
int number
) : first(first), last(last), number(number) {}
std::string name() {
return first + " " + last;
}
};
struct MyDerivedNativeClass : public MyNativeClass {
std::string first2;
std::string last2;
int number2;
MyDerivedNativeClass(
const std::string& first,
const std::string& last,
int number,
const std::string& first2,
const std::string& last2,
int number2
) : MyNativeClass(first, last, number),
first2(first2), last2(last2), number2(number2) {}
std::string name() {
return first + " " + last + " " + first2 + " " + last2;
}
};
typedef struct {
PyObject_HEAD
PyObject *first;
@@ -137,15 +153,69 @@ my_native_module_MyNativeClass_init(my_native_module_MyNativeClass *self, PyObje
}
static PyMemberDef my_native_module_MyNativeClass_members[] = {
{(char*)"first", T_OBJECT_EX, offsetof(my_native_module_MyNativeClass, first), 0,
(char*)"first name"},
{(char*)"last", T_OBJECT_EX, offsetof(my_native_module_MyNativeClass, last), 0,
(char*)"last name"},
{(char*)"number", T_INT, offsetof(my_native_module_MyNativeClass, number), 0,
(char*)"custom number"},
{NULL}
};
static PyObject *
my_native_module_MyNativeClass_getfirst(my_native_module_MyNativeClass *self, void *closure)
{
(void)closure;
Py_INCREF(self->first);
return self->first;
}
static int
my_native_module_MyNativeClass_setfirst(my_native_module_MyNativeClass *self, PyObject *value, void *closure)
{
(void)closure;
PyObject *tmp;
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "Cannot delete the first attribute");
return -1;
}
if (!PyUnicode_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"The first attribute value must be a string");
return -1;
}
tmp = self->first;
Py_INCREF(value);
self->first = value;
Py_DECREF(tmp);
return 0;
}
static PyObject *
my_native_module_MyNativeClass_getlast(my_native_module_MyNativeClass *self, void *closure)
{
(void)closure;
Py_INCREF(self->last);
return self->last;
}
static int
my_native_module_MyNativeClass_setlast(my_native_module_MyNativeClass *self, PyObject *value, void *closure)
{
(void)closure;
PyObject *tmp;
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "Cannot delete the last attribute");
return -1;
}
if (!PyUnicode_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"The last attribute value must be a string");
return -1;
}
tmp = self->last;
Py_INCREF(value);
self->last = value;
Py_DECREF(tmp);
return 0;
}
static PyObject *
my_native_module_MyNativeClass_name(my_native_module_MyNativeClass *self, PyObject *Py_UNUSED(ignored))
{
@@ -157,7 +227,7 @@ my_native_module_MyNativeClass_name(my_native_module_MyNativeClass *self, PyObje
PyErr_SetString(PyExc_AttributeError, "last");
return NULL;
}
return PyUnicode_FromFormat("%S %S", self->first, self->last);
return PyUnicode_FromFormat("%S %S %d", self->first, self->last, self->number + 1);
}
static PyMethodDef my_native_module_MyNativeClass_methods[] = {
@@ -170,6 +240,14 @@ static PyMethodDef my_native_module_MyNativeClass_methods[] = {
{NULL}
};
static PyGetSetDef my_native_module_MyNativeClass_getsetters[] = {
{(char *)"first", (getter) my_native_module_MyNativeClass_getfirst, (setter) my_native_module_MyNativeClass_setfirst,
(char *)"first name", NULL},
{(char *)"last", (getter) my_native_module_MyNativeClass_getlast, (setter) my_native_module_MyNativeClass_setlast,
(char *)"last name", NULL},
{NULL} /* Sentinel */
};
static PyTypeObject my_native_module_MyNativeClassType = {
PyVarObject_HEAD_INIT(NULL, 0)
};
@@ -259,15 +337,69 @@ my_native_module_MyDerivedNativeClass_init(my_native_module_MyDerivedNativeClass
}
static PyMemberDef my_native_module_MyDerivedNativeClass_members[] = {
{(char*)"first2", T_OBJECT_EX, offsetof(my_native_module_MyDerivedNativeClass, first2), 0,
(char*)"first2 name2"},
{(char*)"last2", T_OBJECT_EX, offsetof(my_native_module_MyDerivedNativeClass, last2), 0,
(char*)"last2 name2"},
{(char*)"number2", T_INT, offsetof(my_native_module_MyDerivedNativeClass, number2), 0,
(char*)"custom number2"},
{NULL}
};
static PyObject *
my_native_module_MyDerivedNativeClass_getfirst2(my_native_module_MyDerivedNativeClass *self, void *closure)
{
(void)closure;
Py_INCREF(self->first2);
return self->first2;
}
static int
my_native_module_MyDerivedNativeClass_setfirst2(my_native_module_MyDerivedNativeClass *self, PyObject *value, void *closure)
{
(void)closure;
PyObject *tmp;
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "Cannot delete the first2 attribute");
return -1;
}
if (!PyUnicode_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"The first2 attribute value must be a string");
return -1;
}
tmp = self->first2;
Py_INCREF(value);
self->first2 = value;
Py_DECREF(tmp);
return 0;
}
static PyObject *
my_native_module_MyDerivedNativeClass_getlast2(my_native_module_MyDerivedNativeClass *self, void *closure)
{
(void)closure;
Py_INCREF(self->last2);
return self->last2;
}
static int
my_native_module_MyDerivedNativeClass_setlast2(my_native_module_MyDerivedNativeClass *self, PyObject *value, void *closure)
{
(void)closure;
PyObject *tmp;
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "Cannot delete the last2 attribute");
return -1;
}
if (!PyUnicode_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"The last2 attribute value must be a string");
return -1;
}
tmp = self->last2;
Py_INCREF(value);
self->last2 = value;
Py_DECREF(tmp);
return 0;
}
static PyObject *
my_native_module_MyDerivedNativeClass_name2(my_native_module_MyDerivedNativeClass *self, PyObject *Py_UNUSED(ignored))
{
@@ -287,9 +419,19 @@ my_native_module_MyDerivedNativeClass_name2(my_native_module_MyDerivedNativeClas
PyErr_SetString(PyExc_AttributeError, "last2");
return NULL;
}
return PyUnicode_FromFormat("%S %S %S %S", self->base.first, self->base.last, self->first2, self->last2);
return PyUnicode_FromFormat("%S %S %d %S %S %d",
self->base.first, self->base.last, self->base.number + 1,
self->first2, self->last2, self->number2 + 2);
}
static PyGetSetDef my_native_module_MyDerivedNativeClass_getsetters[] = {
{(char *)"first2", (getter) my_native_module_MyDerivedNativeClass_getfirst2, (setter) my_native_module_MyDerivedNativeClass_setfirst2,
(char *)"first2 name", NULL},
{(char *)"last2", (getter) my_native_module_MyDerivedNativeClass_getlast2, (setter) my_native_module_MyDerivedNativeClass_setlast2,
(char *)"last2 name", NULL},
{NULL} /* Sentinel */
};
static PyMethodDef my_native_module_MyDerivedNativeClass_methods[] = {
{
"name2",
@@ -369,6 +511,7 @@ main(int argc, char *argv[])
my_native_module_MyNativeClassType.tp_clear = (inquiry) my_native_module_MyNativeClass_clear;
my_native_module_MyNativeClassType.tp_members = my_native_module_MyNativeClass_members;
my_native_module_MyNativeClassType.tp_methods = my_native_module_MyNativeClass_methods;
my_native_module_MyNativeClassType.tp_getset = my_native_module_MyNativeClass_getsetters;
my_native_module_MyDerivedNativeClassType.tp_name = "my_native_module.MyDerivedNativeClass";
my_native_module_MyDerivedNativeClassType.tp_doc = "My native class";
@@ -382,6 +525,7 @@ main(int argc, char *argv[])
my_native_module_MyDerivedNativeClassType.tp_clear = (inquiry) my_native_module_MyDerivedNativeClass_clear;
my_native_module_MyDerivedNativeClassType.tp_members = my_native_module_MyDerivedNativeClass_members;
my_native_module_MyDerivedNativeClassType.tp_methods = my_native_module_MyDerivedNativeClass_methods;
my_native_module_MyDerivedNativeClassType.tp_getset = my_native_module_MyDerivedNativeClass_getsetters;
PyImport_AppendInittab("my_native_module", &my_native_module_init_func);
Py_Initialize();