pure.c: custom getsetters

userland/libs/python_embed/pure.c

@@ -55,7 +55,7 @@ static PyMethodDef my_native_methods[] = {
  *         self.number = number
  *
  *     def name(self):
- *         return '{} {}'.format(self.first, self.last)
+ *         return '{} {} {}'.format(self.first, self.last, self.number)
  *
  * class MyDerivedNativeClass(MyNativeClass):
  *
@@ -66,7 +66,7 @@ static PyMethodDef my_native_methods[] = {
  *         self.number2 = number2
  *
  *     def name(self):
- *         return '{} {} {} {} 2'.format(self.first, self.last, self.first2, self.last2)
+ *         return '{} {} {} {} {} {}'.format(self.first, self.last, self.number + 1, self.first2, self.last2, self.number2 + 2)
  * ....
  */
 typedef struct {
@@ -147,15 +147,69 @@ my_native_module_MyNativeClass_init(my_native_module_MyNativeClass *self, PyObje
 }
 
 static PyMemberDef my_native_module_MyNativeClass_members[] = {
-    {"first", T_OBJECT_EX, offsetof(my_native_module_MyNativeClass, first), 0,
-     "first name"},
-    {"last", T_OBJECT_EX, offsetof(my_native_module_MyNativeClass, last), 0,
-     "last name"},
     {"number", T_INT, offsetof(my_native_module_MyNativeClass, number), 0,
      "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))
 {
@@ -167,9 +221,17 @@ 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 PyGetSetDef my_native_module_MyNativeClass_getsetters[] = {
+    {"first", (getter) my_native_module_MyNativeClass_getfirst, (setter) my_native_module_MyNativeClass_setfirst,
+     "first name", NULL},
+    {"last", (getter) my_native_module_MyNativeClass_getlast, (setter) my_native_module_MyNativeClass_setlast,
+     "last name", NULL},
+    {NULL}  /* Sentinel */
+};
+
 static PyMethodDef my_native_module_MyNativeClass_methods[] = {
     {
         "name",
@@ -194,6 +256,7 @@ static PyTypeObject my_native_module_MyNativeClassType = {
     .tp_clear = (inquiry) my_native_module_MyNativeClass_clear,
     .tp_members = my_native_module_MyNativeClass_members,
     .tp_methods = my_native_module_MyNativeClass_methods,
+    .tp_getset = my_native_module_MyNativeClass_getsetters,
 };
 
 typedef struct {
@@ -232,7 +295,7 @@ my_native_module_MyDerivedNativeClass_new(PyTypeObject *type, PyObject *args, Py
     (void)args;
     (void)kwds;
     my_native_module_MyDerivedNativeClass *self;
-    self = (my_native_module_MyDerivedNativeClass *) type->tp_alloc(type, 0);
+    self = (my_native_module_MyDerivedNativeClass *) type->tp_base->tp_new(type, args, kwds);
     if (self != NULL) {
         self->first2 = PyUnicode_FromString("");
         if (self->first2 == NULL) {
@@ -281,20 +344,74 @@ my_native_module_MyDerivedNativeClass_init(my_native_module_MyDerivedNativeClass
 }
 
 static PyMemberDef my_native_module_MyDerivedNativeClass_members[] = {
-    {"first2", T_OBJECT_EX, offsetof(my_native_module_MyDerivedNativeClass, first2), 0,
-     "first2 name2"},
-    {"last2", T_OBJECT_EX, offsetof(my_native_module_MyDerivedNativeClass, last2), 0,
-     "last2 name2"},
     {"number2", T_INT, offsetof(my_native_module_MyDerivedNativeClass, number2), 0,
      "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))
 {
     if (self->base.first == NULL) {
-        PyErr_SetString(PyExc_AttributeError, "first");
+        PyErr_SetString(PyExc_AttributeError, "first2");
         return NULL;
     }
     if (self->base.last == NULL) {
@@ -302,17 +419,26 @@ my_native_module_MyDerivedNativeClass_name2(my_native_module_MyDerivedNativeClas
         return NULL;
     }
     if (self->first2 == NULL) {
-        PyErr_SetString(PyExc_AttributeError, "first2");
+        PyErr_SetString(PyExc_AttributeError, "first22");
         return NULL;
     }
     if (self->last2 == NULL) {
         PyErr_SetString(PyExc_AttributeError, "last2");
         return NULL;
     }
-    return PyUnicode_FromFormat("%S %S %S %S",
+    return PyUnicode_FromFormat("%S %S %d %S %S %d",
-        self->base.first, self->base.last, self->first2, self->last2);
+        self->base.first, self->base.last, self->base.number + 1,
+        self->first2, self->last2, self->number2 + 2);
 }
 
+static PyGetSetDef my_native_module_MyDerivedNativeClass_getsetters[] = {
+    {"first2", (getter) my_native_module_MyDerivedNativeClass_getfirst2, (setter) my_native_module_MyDerivedNativeClass_setfirst2,
+     "first2 name", NULL},
+    {"last2", (getter) my_native_module_MyDerivedNativeClass_getlast2, (setter) my_native_module_MyDerivedNativeClass_setlast2,
+     "last2 name", NULL},
+    {NULL}  /* Sentinel */
+};
+
 static PyMethodDef my_native_module_MyDerivedNativeClass_methods[] = {
     {
         "name2",
@@ -337,6 +463,7 @@ static PyTypeObject my_native_module_MyDerivedNativeClassType = {
     .tp_clear = (inquiry) my_native_module_MyDerivedNativeClass_clear,
     .tp_members = my_native_module_MyDerivedNativeClass_members,
     .tp_methods = my_native_module_MyDerivedNativeClass_methods,
+    .tp_getset = my_native_module_MyDerivedNativeClass_getsetters,
 };
 
 static PyModuleDef my_native_module = {

userland/libs/python_embed/pure.py

@@ -12,18 +12,18 @@ def test_native_method(a, b):
 def test_native_class():
     # Positional arguments.
     my_native_object = my_native_module.MyNativeClass('ab', 'cd', 13)
-    assert my_native_object.name() == 'ab cd'
+    assert my_native_object.name() == 'ab cd 14'
 
     # Named arguments.
     my_native_object = my_native_module.MyNativeClass(first='ef', last='gh', number=13)
-    assert my_native_object.name() == 'ef gh'
+    assert my_native_object.name() == 'ef gh 14'
 
     # Default values and set property.
     my_native_object = my_native_module.MyNativeClass()
     my_native_object.first = 'ih'
-    assert my_native_object.name() == 'ih '
+    assert my_native_object.name() == 'ih  1'
 
     my_derived_native_object = my_native_module.MyDerivedNativeClass('ab', 'cd', 13, 'ef', 'gh', 21)
-    assert my_derived_native_object.name() == 'ab cd'
+    assert my_derived_native_object.name() == 'ab cd 14'
-    assert my_derived_native_object.name2() == 'ab cd ef gh'
+    assert my_derived_native_object.name2() == 'ab cd 14 ef gh 23'
     return 13

userland/libs/python_embed/pure_cpp.cpp

@@ -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.
- *
+ * and bind data and methods it to a C++ class!
- * 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)
  * ....
  */
+
+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();