boostorg-python/src/object/enum.cpp at develop · InfinityOfficialNetwork/boostorg-python · GitHub

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// Copyright David Abrahams 2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#include <boost/python/object/enum_base.hpp>

#include <boost/python/cast.hpp>

#include <boost/python/scope.hpp>

#include <boost/python/object.hpp>

#include <boost/python/tuple.hpp>

#include <boost/python/dict.hpp>

#include <boost/python/str.hpp>

#include <boost/python/extract.hpp>

#include <boost/python/object_protocol.hpp>

#include <structmember.h>

namespace boost { namespace python { namespace objects {

struct enum_object

{

#if PY_VERSION_HEX >= 0x03000000

PyLongObject base_object;

#else

PyIntObject base_object;

#endif

PyObject* name;

};

static PyMemberDef enum_members[] = {

{const_cast<char*>("name"), T_OBJECT_EX, offsetof(enum_object,name),READONLY, 0},

{0, 0, 0, 0, 0}

};

extern "C"

{

static void

enum_dealloc(enum_object* self)

{

Py_XDECREF(self->name);

Py_TYPE(self)->tp_free((PyObject*)self);

}

static PyObject* enum_repr(PyObject* self_)

{

PyObject *mod = PyObject_GetAttrString( self_, "__module__");

object auto_free = object(handle<>(mod));

enum_object* self = downcast<enum_object>(self_);

if (!self->name)

{

return

#if PY_VERSION_HEX >= 0x03000000

PyUnicode_FromFormat("%S.%s(%ld)", mod, self_->ob_type->tp_name, PyLong_AsLong(self_));

#else

PyString_FromFormat("%s.%s(%ld)", PyString_AsString(mod), self_->ob_type->tp_name, PyInt_AS_LONG(self_));

#endif

}

else

{

PyObject* name = self->name;

if (name == 0)

return 0;

return

#if PY_VERSION_HEX >= 0x03000000

PyUnicode_FromFormat("%S.%s.%S", mod, self_->ob_type->tp_name, name);

#else

PyString_FromFormat("%s.%s.%s",

PyString_AsString(mod), self_->ob_type->tp_name, PyString_AsString(name));

#endif

}

static PyObject* enum_str(PyObject* self_)

{

enum_object* self = downcast<enum_object>(self_);

if (!self->name)

{

#if PY_VERSION_HEX >= 0x03000000

return PyLong_Type.tp_str(self_);

#else

return PyInt_Type.tp_str(self_);

#endif

}

else

{

return incref(self->name);

}

static PyTypeObject enum_type_object = {

PyVarObject_HEAD_INIT(NULL, 0) // &PyType_Type

const_cast<char*>("Boost.Python.enum"),

sizeof(enum_object), /* tp_basicsize */

0, /* tp_itemsize */

(destructor) enum_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_compare */

enum_repr, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

0, /* tp_call */

enum_str, /* tp_str */

0, /* tp_getattro */

0, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT

#if PY_VERSION_HEX < 0x03000000

| Py_TPFLAGS_CHECKTYPES

#endif

| Py_TPFLAGS_BASETYPE, /* tp_flags */

0, /* tp_doc */

0, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

0, /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

0, /* tp_methods */

enum_members, /* tp_members */

0, /* tp_getset */

0, //&PyInt_Type, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

0, /* tp_new */

0, /* tp_free */

0, /* tp_is_gc */

0, /* tp_bases */

0, /* tp_mro */

0, /* tp_cache */

0, /* tp_subclasses */

0, /* tp_weaklist */

#if PYTHON_API_VERSION >= 1012

0 /* tp_del */

#endif

};

object module_prefix();

namespace

{

object new_enum_type(char const* name, char const *doc)

{

if (enum_type_object.tp_dict == 0)

{

Py_SET_TYPE(&enum_type_object, incref(&PyType_Type));

#if PY_VERSION_HEX >= 0x03000000

enum_type_object.tp_base = &PyLong_Type;

#else

enum_type_object.tp_base = &PyInt_Type;

#endif

if (PyType_Ready(&enum_type_object))

throw_error_already_set();

}

type_handle metatype(borrowed(&PyType_Type));

type_handle base(borrowed(&enum_type_object));

// suppress the instance __dict__ in these enum objects. There

// may be a slicker way, but this'll do for now.

dict d;

d["__slots__"] = tuple();

d["values"] = dict();

d["names"] = dict();

object module_name = module_prefix();

if (module_name)

d["__module__"] = module_name;

if (doc)

d["__doc__"] = doc;

object result = (object(metatype))(name, make_tuple(base), d);

scope().attr(name) = result;

return result;

}

enum_base::enum_base(

char const* name

, converter::to_python_function_t to_python

, converter::convertible_function convertible

, converter::constructor_function construct

, type_info id

, char const *doc

)

: object(new_enum_type(name, doc))

{

converter::registration& converters

= const_cast<converter::registration&>(

converter::registry::lookup(id));

converters.m_class_object = downcast<PyTypeObject>(this->ptr());

converter::registry::insert(to_python, id);

converter::registry::insert(convertible, construct, id);

}

void enum_base::add_value(char const* name_, long value)

{

// Convert name to Python string

object name(name_);

// Create a new enum instance by calling the class with a value

object x = (*this)(value);

// Store the object in the enum class

(*this).attr(name_) = x;

dict d = extract<dict>(this->attr("values"))();

d[value] = x;

// Set the name field in the new enum instanec

enum_object* p = downcast<enum_object>(x.ptr());

Py_XDECREF(p->name);

p->name = incref(name.ptr());

dict names_dict = extract<dict>(this->attr("names"))();

names_dict[x.attr("name")] = x;

}

void enum_base::export_values()

{

dict d = extract<dict>(this->attr("names"))();

list items = d.items();

scope current;

for (unsigned i = 0, max = len(items); i < max; ++i)

api::setattr(current, items[i][0], items[i][1]);

}

PyObject* enum_base::to_python(PyTypeObject* type_, long x)

{

object type((type_handle(borrowed(type_))));

dict d = extract<dict>(type.attr("values"))();

object v = d.get(x, object());

return incref(

(v == object() ? type(x) : v).ptr());

}

}}} // namespace boost::python::object

boostorg-python/src/object/enum.cpp at develop · InfinityOfficialNetwork/boostorg-python · GitHub

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