cpython/Objects/structseq.c at 2.7 · python-emscripten/cpython · GitHub

Repository navigation

History

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

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

/* Implementation helper: a struct that looks like a tuple. See timemodule

and posixmodule for example uses. */

#include "Python.h"

#include "structmember.h"

#include "structseq.h"

static char visible_length_key[] = "n_sequence_fields";

static char real_length_key[] = "n_fields";

static char unnamed_fields_key[] = "n_unnamed_fields";

/* Fields with this name have only a field index, not a field name.

They are only allowed for indices < n_visible_fields. */

char *PyStructSequence_UnnamedField = "unnamed field";

#define VISIBLE_SIZE(op) Py_SIZE(op)

#define VISIBLE_SIZE_TP(tp) PyInt_AsLong( \

PyDict_GetItemString((tp)->tp_dict, visible_length_key))

#define REAL_SIZE_TP(tp) PyInt_AsLong( \

PyDict_GetItemString((tp)->tp_dict, real_length_key))

#define REAL_SIZE(op) REAL_SIZE_TP(Py_TYPE(op))

#define UNNAMED_FIELDS_TP(tp) PyInt_AsLong( \

PyDict_GetItemString((tp)->tp_dict, unnamed_fields_key))

#define UNNAMED_FIELDS(op) UNNAMED_FIELDS_TP(Py_TYPE(op))

PyObject *

PyStructSequence_New(PyTypeObject *type)

{

PyStructSequence *obj;

obj = PyObject_New(PyStructSequence, type);

if (obj == NULL)

return NULL;

Py_SIZE(obj) = VISIBLE_SIZE_TP(type);

return (PyObject*) obj;

}

static void

structseq_dealloc(PyStructSequence *obj)

{

Py_ssize_t i, size;

size = REAL_SIZE(obj);

for (i = 0; i < size; ++i) {

Py_XDECREF(obj->ob_item[i]);

}

PyObject_Del(obj);

}

static Py_ssize_t

structseq_length(PyStructSequence *obj)

{

return VISIBLE_SIZE(obj);

}

static PyObject*

structseq_item(PyStructSequence *obj, Py_ssize_t i)

{

if (i < 0 || i >= VISIBLE_SIZE(obj)) {

PyErr_SetString(PyExc_IndexError, "tuple index out of range");

return NULL;

}

Py_INCREF(obj->ob_item[i]);

return obj->ob_item[i];

}

static PyObject*

structseq_slice(PyStructSequence *obj, Py_ssize_t low, Py_ssize_t high)

{

PyTupleObject *np;

Py_ssize_t i;

if (low < 0)

low = 0;

if (high > VISIBLE_SIZE(obj))

high = VISIBLE_SIZE(obj);

if (high < low)

high = low;

np = (PyTupleObject *)PyTuple_New(high-low);

if (np == NULL)

return NULL;

for(i = low; i < high; ++i) {

PyObject *v = obj->ob_item[i];

Py_INCREF(v);

PyTuple_SET_ITEM(np, i-low, v);

}

return (PyObject *) np;

}

static PyObject *

structseq_subscript(PyStructSequence *self, PyObject *item)

{

if (PyIndex_Check(item)) {

Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);

if (i == -1 && PyErr_Occurred())

return NULL;

if (i < 0)

i += VISIBLE_SIZE(self);

if (i < 0 || i >= VISIBLE_SIZE(self)) {

PyErr_SetString(PyExc_IndexError,

"tuple index out of range");

return NULL;

}

Py_INCREF(self->ob_item[i]);

return self->ob_item[i];

}

else if (PySlice_Check(item)) {

Py_ssize_t start, stop, step, slicelen, cur, i;

PyObject *result;

if (_PySlice_Unpack(item, &start, &stop, &step) < 0) {

return NULL;

}

slicelen = _PySlice_AdjustIndices(VISIBLE_SIZE(self), &start, &stop,

step);

if (slicelen <= 0)

return PyTuple_New(0);

result = PyTuple_New(slicelen);

if (result == NULL)

return NULL;

for (cur = start, i = 0; i < slicelen;

cur += step, i++) {

PyObject *v = self->ob_item[cur];

Py_INCREF(v);

PyTuple_SET_ITEM(result, i, v);

}

return result;

}

else {

PyErr_SetString(PyExc_TypeError,

"structseq index must be integer");

return NULL;

}

static PyObject *

structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)

{

PyObject *arg = NULL;

PyObject *dict = NULL;

PyObject *ob;

PyStructSequence *res = NULL;

Py_ssize_t len, min_len, max_len, i, n_unnamed_fields;

static char *kwlist[] = {"sequence", "dict", 0};

if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:structseq",

kwlist, &arg, &dict))

return NULL;

arg = PySequence_Fast(arg, "constructor requires a sequence");

if (!arg) {

return NULL;

}

if (dict && !PyDict_Check(dict)) {

PyErr_Format(PyExc_TypeError,

"%.500s() takes a dict as second arg, if any",

type->tp_name);

Py_DECREF(arg);

return NULL;

}

len = PySequence_Fast_GET_SIZE(arg);

min_len = VISIBLE_SIZE_TP(type);

max_len = REAL_SIZE_TP(type);

n_unnamed_fields = UNNAMED_FIELDS_TP(type);

if (min_len != max_len) {

if (len < min_len) {

PyErr_Format(PyExc_TypeError,

"%.500s() takes an at least %zd-sequence (%zd-sequence given)",

type->tp_name, min_len, len);

Py_DECREF(arg);

return NULL;

}

if (len > max_len) {

PyErr_Format(PyExc_TypeError,

"%.500s() takes an at most %zd-sequence (%zd-sequence given)",

type->tp_name, max_len, len);

Py_DECREF(arg);

return NULL;

}

else {

if (len != min_len) {

PyErr_Format(PyExc_TypeError,

"%.500s() takes a %zd-sequence (%zd-sequence given)",

type->tp_name, min_len, len);

Py_DECREF(arg);

return NULL;

}

res = (PyStructSequence*) PyStructSequence_New(type);

if (res == NULL) {

Py_DECREF(arg);

return NULL;

}

for (i = 0; i < len; ++i) {

PyObject *v = PySequence_Fast_GET_ITEM(arg, i);

Py_INCREF(v);

res->ob_item[i] = v;

}

for (; i < max_len; ++i) {

if (dict && (ob = PyDict_GetItemString(

dict, type->tp_members[i-n_unnamed_fields].name))) {

}

else {

ob = Py_None;

}

Py_INCREF(ob);

res->ob_item[i] = ob;

}

Py_DECREF(arg);

return (PyObject*) res;

}

static PyObject *

make_tuple(PyStructSequence *obj)

{

return structseq_slice(obj, 0, VISIBLE_SIZE(obj));

}

static PyObject *

structseq_repr(PyStructSequence *obj)

{

/* buffer and type size were chosen well considered. */

#define REPR_BUFFER_SIZE 512

#define TYPE_MAXSIZE 100

PyObject *tup;

PyTypeObject *typ = Py_TYPE(obj);

int i, removelast = 0;

Py_ssize_t len;

char buf[REPR_BUFFER_SIZE];

char *endofbuf, *pbuf = buf;

/* pointer to end of writeable buffer; safes space for "...)\0" */

endofbuf= &buf[REPR_BUFFER_SIZE-5];

if ((tup = make_tuple(obj)) == NULL) {

return NULL;

}

/* "typename(", limited to TYPE_MAXSIZE */

len = strlen(typ->tp_name);

if (len > TYPE_MAXSIZE) {

len = TYPE_MAXSIZE;

}

pbuf = memcpy(pbuf, typ->tp_name, len);

pbuf += len;

*pbuf++ = '(';

for (i=0; i < VISIBLE_SIZE(obj); i++) {

PyObject *val, *repr;

char *cname, *crepr;

cname = typ->tp_members[i].name;

val = PyTuple_GetItem(tup, i);

if (cname == NULL || val == NULL) {

Py_DECREF(tup);

return NULL;

}

repr = PyObject_Repr(val);

if (repr == NULL) {

Py_DECREF(tup);

return NULL;

}

crepr = PyString_AsString(repr);

if (crepr == NULL) {

Py_DECREF(tup);

Py_DECREF(repr);

return NULL;

}

/* + 3: keep space for "=" and ", " */

len = strlen(cname) + strlen(crepr) + 3;

if ((pbuf+len) <= endofbuf) {

strcpy(pbuf, cname);

pbuf += strlen(cname);

*pbuf++ = '=';

strcpy(pbuf, crepr);

pbuf += strlen(crepr);

*pbuf++ = ',';

*pbuf++ = ' ';

removelast = 1;

Py_DECREF(repr);

}

else {

strcpy(pbuf, "...");

pbuf += 3;

removelast = 0;

Py_DECREF(repr);

break;

}

Py_DECREF(tup);

if (removelast) {

/* overwrite last ", " */

pbuf-=2;

}

*pbuf++ = ')';

*pbuf = '\0';

return PyString_FromString(buf);

}

static PyObject *

structseq_concat(PyStructSequence *obj, PyObject *b)

{

PyObject *tup, *result;

tup = make_tuple(obj);

result = PySequence_Concat(tup, b);

Py_DECREF(tup);

return result;

}

static PyObject *

structseq_repeat(PyStructSequence *obj, Py_ssize_t n)

{

PyObject *tup, *result;

tup = make_tuple(obj);

result = PySequence_Repeat(tup, n);

Py_DECREF(tup);

return result;

}

static int

structseq_contains(PyStructSequence *obj, PyObject *o)

{

PyObject *tup;

int result;

tup = make_tuple(obj);

if (!tup)

return -1;

result = PySequence_Contains(tup, o);

Py_DECREF(tup);

return result;

}

static long

structseq_hash(PyObject *obj)

{

PyObject *tup;

long result;

tup = make_tuple((PyStructSequence*) obj);

if (!tup)

return -1;

result = PyObject_Hash(tup);

Py_DECREF(tup);

return result;

}

static PyObject *

structseq_richcompare(PyObject *obj, PyObject *o2, int op)

{

PyObject *tup, *result;

tup = make_tuple((PyStructSequence*) obj);

result = PyObject_RichCompare(tup, o2, op);

Py_DECREF(tup);

return result;

}

static PyObject *

structseq_reduce(PyStructSequence* self)

{

PyObject* tup;

PyObject* dict;

PyObject* result;

Py_ssize_t n_fields, n_visible_fields, n_unnamed_fields;

int i;

n_fields = REAL_SIZE(self);

n_visible_fields = VISIBLE_SIZE(self);

n_unnamed_fields = UNNAMED_FIELDS(self);

tup = PyTuple_New(n_visible_fields);

if (!tup) {

return NULL;

}

dict = PyDict_New();

if (!dict) {

Py_DECREF(tup);

return NULL;

}

for (i = 0; i < n_visible_fields; i++) {

Py_INCREF(self->ob_item[i]);

PyTuple_SET_ITEM(tup, i, self->ob_item[i]);

}

for (; i < n_fields; i++) {

char *n = Py_TYPE(self)->tp_members[i-n_unnamed_fields].name;

PyDict_SetItemString(dict, n,

self->ob_item[i]);

}

result = Py_BuildValue("(O(OO))", Py_TYPE(self), tup, dict);

Py_DECREF(tup);

Py_DECREF(dict);

return result;

}

static PySequenceMethods structseq_as_sequence = {

(lenfunc)structseq_length,

(binaryfunc)structseq_concat, /* sq_concat */

(ssizeargfunc)structseq_repeat, /* sq_repeat */

(ssizeargfunc)structseq_item, /* sq_item */

(ssizessizeargfunc)structseq_slice, /* sq_slice */

0, /* sq_ass_item */

0, /* sq_ass_slice */

(objobjproc)structseq_contains, /* sq_contains */

};

static PyMappingMethods structseq_as_mapping = {

(lenfunc)structseq_length,

(binaryfunc)structseq_subscript,

};

static PyMethodDef structseq_methods[] = {

{"__reduce__", (PyCFunction)structseq_reduce,

METH_NOARGS, NULL},

{NULL, NULL}

};

static PyTypeObject _struct_sequence_template = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

NULL, /* tp_name */

0, /* tp_basicsize */

0, /* tp_itemsize */

(destructor)structseq_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_compare */

(reprfunc)structseq_repr, /* tp_repr */

0, /* tp_as_number */

&structseq_as_sequence, /* tp_as_sequence */

&structseq_as_mapping, /* tp_as_mapping */

structseq_hash, /* tp_hash */

0, /* tp_call */

0, /* tp_str */

0, /* tp_getattro */

0, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT, /* tp_flags */

NULL, /* tp_doc */

0, /* tp_traverse */

0, /* tp_clear */

structseq_richcompare, /* tp_richcompare */

0, /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

structseq_methods, /* tp_methods */

NULL, /* tp_members */

0, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

structseq_new, /* tp_new */

};

void

PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)

{

PyObject *dict;

PyMemberDef* members;

int n_members, n_unnamed_members, i, k;

#ifdef Py_TRACE_REFS

/* if the type object was chained, unchain it first

before overwriting its storage */

if (type->_ob_next) {

_Py_ForgetReference((PyObject*)type);

}

#endif

n_unnamed_members = 0;

for (i = 0; desc->fields[i].name != NULL; ++i)

if (desc->fields[i].name == PyStructSequence_UnnamedField)

n_unnamed_members++;

n_members = i;

memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));

type->tp_name = desc->name;

type->tp_doc = desc->doc;

type->tp_basicsize = sizeof(PyStructSequence)+

sizeof(PyObject*)*(n_members-1);

type->tp_itemsize = 0;

members = PyMem_NEW(PyMemberDef, n_members-n_unnamed_members+1);

if (members == NULL)

return;

for (i = k = 0; i < n_members; ++i) {

if (desc->fields[i].name == PyStructSequence_UnnamedField)

continue;

members[k].name = desc->fields[i].name;

members[k].type = T_OBJECT;

members[k].offset = offsetof(PyStructSequence, ob_item)

+ i * sizeof(PyObject*);

members[k].flags = READONLY;

members[k].doc = desc->fields[i].doc;

k++;

}

members[k].name = NULL;

type->tp_members = members;

if (PyType_Ready(type) < 0)

return;

Py_INCREF(type);

dict = type->tp_dict;

#define SET_DICT_FROM_INT(key, value) \

do { \

PyObject *v = PyInt_FromLong((long) value); \

if (v != NULL) { \

PyDict_SetItemString(dict, key, v); \

Py_DECREF(v); \

} \

} while (0)

SET_DICT_FROM_INT(visible_length_key, desc->n_in_sequence);

SET_DICT_FROM_INT(real_length_key, n_members);

SET_DICT_FROM_INT(unnamed_fields_key, n_unnamed_members);

}

cpython/Objects/structseq.c at 2.7 · python-emscripten/cpython · GitHub

Repository navigation

Expand file tree

Breadcrumbs

structseq.c

Latest commit

History

Breadcrumbs

structseq.c

File metadata and controls