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246 lines (216 loc) · 8.07 KB
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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 PyObject* enum_repr(PyObject* self_)
{
// XXX(bhy) Potentional memory leak here since PyObject_GetAttrString returns a new reference
// const char *mod = PyString_AsString(PyObject_GetAttrString( self_, const_cast<char*>("__module__")));
PyObject *mod = PyObject_GetAttrString( self_, "__module__");
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 */
0, /* 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_HAVE_GC
| 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_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