python/src/object/enum.cpp at develop · FadyEssam/python · GitHub

History

252 lines (221 loc) · 8.05 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

// 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_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

python/src/object/enum.cpp at develop · FadyEssam/python · GitHub

Expand file tree

Breadcrumbs

enum.cpp

Latest commit

History

Breadcrumbs

enum.cpp

File metadata and controls