cpython/Modules/_json.c at c3157480601499565fd42a8afbdb0207328ac484 · python/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

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

901

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

922

923

924

925

926

927

928

929

930

931

932

933

934

935

936

937

938

939

940

941

942

943

944

945

946

947

948

949

950

951

952

953

954

955

956

957

958

959

960

961

962

963

964

965

966

967

968

969

970

971

972

973

974

975

976

977

978

979

980

981

982

983

984

985

986

987

988

989

990

991

992

993

994

995

996

997

998

999

1000

/* JSON accelerator C extensor: _json module.

* It is built as a built-in module (Py_BUILD_CORE_BUILTIN define) on Windows

* and as an extension module (Py_BUILD_CORE_MODULE define) on other

* platforms. */

#ifndef Py_BUILD_CORE_BUILTIN

# define Py_BUILD_CORE_MODULE 1

#endif

#include "Python.h"

#include "pycore_ceval.h" // _Py_EnterRecursiveCall()

#include "pycore_critical_section.h" // Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST()

#include "pycore_global_strings.h" // _Py_ID()

#include "pycore_pyerrors.h" // _PyErr_FormatNote

#include "pycore_runtime.h" // _PyRuntime

#include "pycore_unicodeobject.h" // _PyUnicode_CheckConsistency()

#include <stdbool.h> // bool

#include "clinic/_json.c.h"

/*[clinic input]

module _json

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=549fa53592c925b2]*/

typedef struct _PyScannerObject {

PyObject_HEAD

signed char strict;

PyObject *object_hook;

PyObject *object_pairs_hook;

PyObject *parse_float;

PyObject *parse_int;

PyObject *parse_constant;

} PyScannerObject;

#define PyScannerObject_CAST(op) ((PyScannerObject *)(op))

static PyMemberDef scanner_members[] = {

{"strict", Py_T_BOOL, offsetof(PyScannerObject, strict), Py_READONLY, "strict"},

{"object_hook", _Py_T_OBJECT, offsetof(PyScannerObject, object_hook), Py_READONLY, "object_hook"},

{"object_pairs_hook", _Py_T_OBJECT, offsetof(PyScannerObject, object_pairs_hook), Py_READONLY},

{"parse_float", _Py_T_OBJECT, offsetof(PyScannerObject, parse_float), Py_READONLY, "parse_float"},

{"parse_int", _Py_T_OBJECT, offsetof(PyScannerObject, parse_int), Py_READONLY, "parse_int"},

{"parse_constant", _Py_T_OBJECT, offsetof(PyScannerObject, parse_constant), Py_READONLY, "parse_constant"},

{NULL}

};

typedef struct _PyEncoderObject {

PyObject_HEAD

PyObject *markers;

PyObject *defaultfn;

PyObject *encoder;

PyObject *indent;

PyObject *key_separator;

PyObject *item_separator;

char sort_keys;

char skipkeys;

int allow_nan;

int (*fast_encode)(PyUnicodeWriter *, PyObject *);

} PyEncoderObject;

#define PyEncoderObject_CAST(op) ((PyEncoderObject *)(op))

static PyMemberDef encoder_members[] = {

{"markers", _Py_T_OBJECT, offsetof(PyEncoderObject, markers), Py_READONLY, "markers"},

{"default", _Py_T_OBJECT, offsetof(PyEncoderObject, defaultfn), Py_READONLY, "default"},

{"encoder", _Py_T_OBJECT, offsetof(PyEncoderObject, encoder), Py_READONLY, "encoder"},

{"indent", _Py_T_OBJECT, offsetof(PyEncoderObject, indent), Py_READONLY, "indent"},

{"key_separator", _Py_T_OBJECT, offsetof(PyEncoderObject, key_separator), Py_READONLY, "key_separator"},

{"item_separator", _Py_T_OBJECT, offsetof(PyEncoderObject, item_separator), Py_READONLY, "item_separator"},

{"sort_keys", Py_T_BOOL, offsetof(PyEncoderObject, sort_keys), Py_READONLY, "sort_keys"},

{"skipkeys", Py_T_BOOL, offsetof(PyEncoderObject, skipkeys), Py_READONLY, "skipkeys"},

{NULL}

};

/* Forward decls */

static PyObject *

ascii_escape_unicode(PyObject *pystr);

static PyObject *

py_encode_basestring_ascii(PyObject* Py_UNUSED(self), PyObject *pystr);

static PyObject *

scan_once_unicode(PyScannerObject *s, PyObject *memo, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr);

static PyObject *

_build_rval_index_tuple(PyObject *rval, Py_ssize_t idx);

static PyObject *

scanner_new(PyTypeObject *type, PyObject *args, PyObject *kwds);

static void

scanner_dealloc(PyObject *self);

static int

scanner_clear(PyObject *self);

static PyObject *

encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds);

static void

encoder_dealloc(PyObject *self);

static int

encoder_clear(PyObject *self);

static int

encoder_listencode_list(PyEncoderObject *s, PyUnicodeWriter *writer, PyObject *seq, Py_ssize_t indent_level, PyObject *indent_cache);

static int

encoder_listencode_obj(PyEncoderObject *s, PyUnicodeWriter *writer, PyObject *obj, Py_ssize_t indent_level, PyObject *indent_cache);

static int

encoder_listencode_dict(PyEncoderObject *s, PyUnicodeWriter *writer, PyObject *dct, Py_ssize_t indent_level, PyObject *indent_cache);

static PyObject *

_encoded_const(PyObject *obj);

static void

raise_errmsg(const char *msg, PyObject *s, Py_ssize_t end);

static int

_steal_accumulate(PyUnicodeWriter *writer, PyObject *stolen);

static int

encoder_write_string(PyEncoderObject *s, PyUnicodeWriter *writer, PyObject *obj);

static PyObject *

encoder_encode_float(PyEncoderObject *s, PyObject *obj);

#define S_CHAR(c) (c >= ' ' && c <= '~' && c != '\\' && c != '"')

#define IS_WHITESPACE(c) (((c) == ' ') || ((c) == '\t') || ((c) == '\n') || ((c) == '\r'))

static Py_ssize_t

ascii_escape_unichar(Py_UCS4 c, unsigned char *output, Py_ssize_t chars)

{

/* Escape unicode code point c to ASCII escape sequences

in char *output. output must have at least 12 bytes unused to

accommodate an escaped surrogate pair "\uXXXX\uXXXX" */

output[chars++] = '\\';

switch (c) {

case '\\': output[chars++] = c; break;

case '"': output[chars++] = c; break;

case '\b': output[chars++] = 'b'; break;

case '\f': output[chars++] = 'f'; break;

case '\n': output[chars++] = 'n'; break;

case '\r': output[chars++] = 'r'; break;

case '\t': output[chars++] = 't'; break;

default:

if (c >= 0x10000) {

/* UTF-16 surrogate pair */

Py_UCS4 v = Py_UNICODE_HIGH_SURROGATE(c);

output[chars++] = 'u';

output[chars++] = Py_hexdigits[(v >> 12) & 0xf];

output[chars++] = Py_hexdigits[(v >> 8) & 0xf];

output[chars++] = Py_hexdigits[(v >> 4) & 0xf];

output[chars++] = Py_hexdigits[(v ) & 0xf];

c = Py_UNICODE_LOW_SURROGATE(c);

output[chars++] = '\\';

}

output[chars++] = 'u';

output[chars++] = Py_hexdigits[(c >> 12) & 0xf];

output[chars++] = Py_hexdigits[(c >> 8) & 0xf];

output[chars++] = Py_hexdigits[(c >> 4) & 0xf];

output[chars++] = Py_hexdigits[(c ) & 0xf];

}

return chars;

}

static Py_ssize_t

ascii_escape_size(const void *input, int kind, Py_ssize_t input_chars)

{

Py_ssize_t i;

Py_ssize_t output_size;

/* Compute the output size */

for (i = 0, output_size = 2; i < input_chars; i++) {

Py_UCS4 c = PyUnicode_READ(kind, input, i);

Py_ssize_t d;

if (S_CHAR(c)) {

d = 1;

}

else {

switch(c) {

case '\\': case '"': case '\b': case '\f':

case '\n': case '\r': case '\t':

d = 2; break;

default:

d = c >= 0x10000 ? 12 : 6;

}

if (output_size > PY_SSIZE_T_MAX - d) {

PyErr_SetString(PyExc_OverflowError, "string is too long to escape");

return -1;

}

output_size += d;

}

return output_size;

}

static PyObject *

ascii_escape_unicode_and_size(const void *input, int kind, Py_ssize_t input_chars, Py_ssize_t output_size)

{

Py_ssize_t i;

Py_ssize_t chars;

PyObject *rval;

Py_UCS1 *output;

rval = PyUnicode_New(output_size, 127);

if (rval == NULL) {

return NULL;

}

output = PyUnicode_1BYTE_DATA(rval);

chars = 0;

output[chars++] = '"';

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

Py_UCS4 c = PyUnicode_READ(kind, input, i);

if (S_CHAR(c)) {

output[chars++] = c;

}

else {

chars = ascii_escape_unichar(c, output, chars);

}

output[chars++] = '"';

#ifdef Py_DEBUG

assert(_PyUnicode_CheckConsistency(rval, 1));

#endif

return rval;

}

static PyObject *

ascii_escape_unicode(PyObject *pystr)

{

/* Take a PyUnicode pystr and return a new ASCII-only escaped PyUnicode */

Py_ssize_t input_chars = PyUnicode_GET_LENGTH(pystr);

const void *input = PyUnicode_DATA(pystr);

int kind = PyUnicode_KIND(pystr);

Py_ssize_t output_size = ascii_escape_size(input, kind, input_chars);

if (output_size < 0) {

return NULL;

}

return ascii_escape_unicode_and_size(input, kind, input_chars, output_size);

}

static int

write_escaped_ascii(PyUnicodeWriter *writer, PyObject *pystr)

{

Py_ssize_t input_chars;

const void *input;

int kind;

input_chars = PyUnicode_GET_LENGTH(pystr);

input = PyUnicode_DATA(pystr);

kind = PyUnicode_KIND(pystr);

Py_ssize_t output_size = ascii_escape_size(input, kind, input_chars);

if (output_size < 0) {

return -1;

}

if (output_size == input_chars + 2) {

/* No need to escape anything */

if (PyUnicodeWriter_WriteChar(writer, '"') < 0) {

return -1;

}

if (PyUnicodeWriter_WriteStr(writer, pystr) < 0) {

return -1;

}

return PyUnicodeWriter_WriteChar(writer, '"');

}

PyObject *rval = ascii_escape_unicode_and_size(input, kind, input_chars, output_size);

if (rval == NULL) {

return -1;

}

return _steal_accumulate(writer, rval);

}

static Py_ssize_t

escape_size(const void *input, int kind, Py_ssize_t input_chars)

{

Py_ssize_t i;

Py_ssize_t output_size;

/* Compute the output size */

for (i = 0, output_size = 2; i < input_chars; i++) {

Py_UCS4 c = PyUnicode_READ(kind, input, i);

Py_ssize_t d;

switch (c) {

case '\\': case '"': case '\b': case '\f':

case '\n': case '\r': case '\t':

d = 2;

break;

default:

if (c <= 0x1f)

d = 6;

else

d = 1;

}

if (output_size > PY_SSIZE_T_MAX - d) {

PyErr_SetString(PyExc_OverflowError, "string is too long to escape");

return -1;

}

output_size += d;

}

return output_size;

}

static PyObject *

escape_unicode_and_size(const void *input, int kind, Py_UCS4 maxchar, Py_ssize_t input_chars, Py_ssize_t output_size)

{

Py_ssize_t i;

Py_ssize_t chars;

PyObject *rval;

rval = PyUnicode_New(output_size, maxchar);

if (rval == NULL)

return NULL;

kind = PyUnicode_KIND(rval);

#define ENCODE_OUTPUT do { \

chars = 0; \

output[chars++] = '"'; \

for (i = 0; i < input_chars; i++) { \

Py_UCS4 c = PyUnicode_READ(kind, input, i); \

switch (c) { \

case '\\': output[chars++] = '\\'; output[chars++] = c; break; \

case '"': output[chars++] = '\\'; output[chars++] = c; break; \

case '\b': output[chars++] = '\\'; output[chars++] = 'b'; break; \

case '\f': output[chars++] = '\\'; output[chars++] = 'f'; break; \

case '\n': output[chars++] = '\\'; output[chars++] = 'n'; break; \

case '\r': output[chars++] = '\\'; output[chars++] = 'r'; break; \

case '\t': output[chars++] = '\\'; output[chars++] = 't'; break; \

default: \

if (c <= 0x1f) { \

output[chars++] = '\\'; \

output[chars++] = 'u'; \

output[chars++] = '0'; \

output[chars++] = Py_hexdigits[(c >> 4) & 0xf]; \

output[chars++] = Py_hexdigits[(c ) & 0xf]; \

} else { \

output[chars++] = c; \

} \

output[chars++] = '"'; \

} while (0)

if (kind == PyUnicode_1BYTE_KIND) {

Py_UCS1 *output = PyUnicode_1BYTE_DATA(rval);

ENCODE_OUTPUT;

} else if (kind == PyUnicode_2BYTE_KIND) {

Py_UCS2 *output = PyUnicode_2BYTE_DATA(rval);

ENCODE_OUTPUT;

} else {

Py_UCS4 *output = PyUnicode_4BYTE_DATA(rval);

assert(kind == PyUnicode_4BYTE_KIND);

ENCODE_OUTPUT;

}

#undef ENCODE_OUTPUT

#ifdef Py_DEBUG

assert(_PyUnicode_CheckConsistency(rval, 1));

#endif

return rval;

}

static PyObject *

escape_unicode(PyObject *pystr)

{

/* Take a PyUnicode pystr and return a new escaped PyUnicode */

Py_ssize_t input_chars = PyUnicode_GET_LENGTH(pystr);

const void *input = PyUnicode_DATA(pystr);

int kind = PyUnicode_KIND(pystr);

Py_UCS4 maxchar = PyUnicode_MAX_CHAR_VALUE(pystr);

Py_ssize_t output_size = escape_size(input, kind, input_chars);

if (output_size < 0) {

return NULL;

}

return escape_unicode_and_size(input, kind, maxchar, input_chars, output_size);

}

static int

write_escaped_unicode(PyUnicodeWriter *writer, PyObject *pystr)

{

Py_ssize_t input_chars = PyUnicode_GET_LENGTH(pystr);

const void *input = PyUnicode_DATA(pystr);

int kind = PyUnicode_KIND(pystr);

Py_UCS4 maxchar = PyUnicode_MAX_CHAR_VALUE(pystr);

Py_ssize_t output_size = escape_size(input, kind, input_chars);

if (output_size < 0) {

return -1;

}

if (output_size == input_chars + 2) {

/* No need to escape anything */

if (PyUnicodeWriter_WriteChar(writer, '"') < 0) {

return -1;

}

if (PyUnicodeWriter_WriteStr(writer, pystr) < 0) {

return -1;

}

return PyUnicodeWriter_WriteChar(writer, '"');

}

PyObject *rval = escape_unicode_and_size(input, kind, maxchar, input_chars, output_size);

if (rval == NULL) {

return -1;

}

return _steal_accumulate(writer, rval);

}

static void

raise_errmsg(const char *msg, PyObject *s, Py_ssize_t end)

{

/* Use JSONDecodeError exception to raise a nice looking ValueError subclass */

_Py_DECLARE_STR(json_decoder, "json.decoder");

PyObject *JSONDecodeError =

PyImport_ImportModuleAttr(&_Py_STR(json_decoder), &_Py_ID(JSONDecodeError));

if (JSONDecodeError == NULL) {

return;

}

PyObject *exc;

exc = PyObject_CallFunction(JSONDecodeError, "zOn", msg, s, end);

if (exc) {

PyErr_SetObject(JSONDecodeError, exc);

Py_DECREF(exc);

}

Py_DECREF(JSONDecodeError);

}

static void

raise_stop_iteration(Py_ssize_t idx)

{

PyObject *value = PyLong_FromSsize_t(idx);

if (value != NULL) {

PyErr_SetObject(PyExc_StopIteration, value);

Py_DECREF(value);

}

static PyObject *

_build_rval_index_tuple(PyObject *rval, Py_ssize_t idx) {

/* return (rval, idx) tuple, stealing reference to rval */

PyObject *tpl;

PyObject *pyidx;

steal a reference to rval, returns (rval, idx)

if (rval == NULL) {

return NULL;

}

pyidx = PyLong_FromSsize_t(idx);

if (pyidx == NULL) {

Py_DECREF(rval);

return NULL;

}

tpl = PyTuple_New(2);

if (tpl == NULL) {

Py_DECREF(pyidx);

Py_DECREF(rval);

return NULL;

}

PyTuple_SET_ITEM(tpl, 0, rval);

PyTuple_SET_ITEM(tpl, 1, pyidx);

return tpl;

}

static PyObject *

scanstring_unicode(PyObject *pystr, Py_ssize_t end, int strict, Py_ssize_t *next_end_ptr)

{

/* Read the JSON string from PyUnicode pystr.

end is the index of the first character after the quote.

if strict is zero then literal control characters are allowed

*next_end_ptr is a return-by-reference index of the character

after the end quote

Return value is a new PyUnicode

PyObject *rval = NULL;

Py_ssize_t len;

Py_ssize_t begin = end - 1;

Py_ssize_t next /* = begin */;

const void *buf;

int kind;

PyUnicodeWriter *writer = NULL;

len = PyUnicode_GET_LENGTH(pystr);

buf = PyUnicode_DATA(pystr);

kind = PyUnicode_KIND(pystr);

if (end < 0 || len < end) {

PyErr_SetString(PyExc_ValueError, "end is out of bounds");

goto bail;

}

while (1) {

/* Find the end of the string or the next escape */

Py_UCS4 c;

{

// Use tight scope variable to help register allocation.

Py_UCS4 d = 0;

for (next = end; next < len; next++) {

d = PyUnicode_READ(kind, buf, next);

if (d == '"' || d == '\\') {

break;

}

if (d <= 0x1f && strict) {

raise_errmsg("Invalid control character at", pystr, next);

goto bail;

}

c = d;

}

if (c == '"') {

// Fast path for simple case.

if (writer == NULL) {

PyObject *ret = PyUnicode_Substring(pystr, end, next);

if (ret == NULL) {

goto bail;

}

*next_end_ptr = next + 1;;

return ret;

}

else if (c != '\\') {

raise_errmsg("Unterminated string starting at", pystr, begin);

goto bail;

} else if (writer == NULL) {

writer = PyUnicodeWriter_Create(0);

if (writer == NULL) {

goto bail;

}

/* Pick up this chunk if it's not zero length */

if (next != end) {

if (PyUnicodeWriter_WriteSubstring(writer, pystr, end, next) < 0) {

goto bail;

}

next++;

if (c == '"') {

end = next;

break;

}

if (next == len) {

raise_errmsg("Unterminated string starting at", pystr, begin);

goto bail;

}

c = PyUnicode_READ(kind, buf, next);

if (c != 'u') {

/* Non-unicode backslash escapes */

end = next + 1;

switch (c) {

case '"': break;

case '\\': break;

case '/': break;

case 'b': c = '\b'; break;

case 'f': c = '\f'; break;

case 'n': c = '\n'; break;

case 'r': c = '\r'; break;

case 't': c = '\t'; break;

default: c = 0;

}

if (c == 0) {

raise_errmsg("Invalid \\escape", pystr, end - 2);

goto bail;

}

else {

c = 0;

next++;

end = next + 4;

if (end >= len) {

raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);

goto bail;

}

/* Decode 4 hex digits */

for (; next < end; next++) {

Py_UCS4 digit = PyUnicode_READ(kind, buf, next);

c <<= 4;

switch (digit) {

case '0': case '1': case '2': case '3': case '4':

case '5': case '6': case '7': case '8': case '9':

c |= (digit - '0'); break;

case 'a': case 'b': case 'c': case 'd': case 'e':

case 'f':

c |= (digit - 'a' + 10); break;

case 'A': case 'B': case 'C': case 'D': case 'E':

case 'F':

c |= (digit - 'A' + 10); break;

default:

raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);

goto bail;

}

/* Surrogate pair */

if (Py_UNICODE_IS_HIGH_SURROGATE(c) && end + 6 < len &&

PyUnicode_READ(kind, buf, next++) == '\\' &&

PyUnicode_READ(kind, buf, next++) == 'u') {

Py_UCS4 c2 = 0;

end += 6;

/* Decode 4 hex digits */

for (; next < end; next++) {

Py_UCS4 digit = PyUnicode_READ(kind, buf, next);

c2 <<= 4;

switch (digit) {

case '0': case '1': case '2': case '3': case '4':

case '5': case '6': case '7': case '8': case '9':

c2 |= (digit - '0'); break;

case 'a': case 'b': case 'c': case 'd': case 'e':

case 'f':

c2 |= (digit - 'a' + 10); break;

case 'A': case 'B': case 'C': case 'D': case 'E':

case 'F':

c2 |= (digit - 'A' + 10); break;

default:

raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);

goto bail;

}

if (Py_UNICODE_IS_LOW_SURROGATE(c2))

c = Py_UNICODE_JOIN_SURROGATES(c, c2);

else

end -= 6;

}

if (PyUnicodeWriter_WriteChar(writer, c) < 0) {

goto bail;

}

rval = PyUnicodeWriter_Finish(writer);

*next_end_ptr = end;

return rval;

bail:

*next_end_ptr = -1;

PyUnicodeWriter_Discard(writer);

return NULL;

}

/*[clinic input]

_json.scanstring as py_scanstring

pystr: unicode

end: Py_ssize_t

strict: bool = True

Scan the string s for a JSON string.

End is the index of the character in s after the quote that started the

JSON string. Unescapes all valid JSON string escape sequences and raises

ValueError on attempt to decode an invalid string. If strict is False

then literal control characters are allowed in the string.

Returns a tuple of the decoded string and the index of the character in s

after the end quote.

[clinic start generated code]*/

static PyObject *

py_scanstring_impl(PyObject *module, PyObject *pystr, Py_ssize_t end,

int strict)

/*[clinic end generated code: output=961740cfae07cdb3 input=cff59e47498f4d8e]*/

{

Py_ssize_t next_end = -1;

PyObject *rval = scanstring_unicode(pystr, end, strict, &next_end);

return _build_rval_index_tuple(rval, next_end);

}

/*[clinic input]

_json.encode_basestring_ascii as py_encode_basestring_ascii

pystr: unicode

Return an ASCII-only JSON representation of a Python string

[clinic start generated code]*/

static PyObject *

py_encode_basestring_ascii_impl(PyObject *module, PyObject *pystr)

/*[clinic end generated code: output=7b3841287cf211df input=4f3609498aff2de5]*/

{

return ascii_escape_unicode(pystr);

}

/*[clinic input]

_json.encode_basestring as py_encode_basestring

pystr: unicode

Return a JSON representation of a Python string

[clinic start generated code]*/

static PyObject *

py_encode_basestring_impl(PyObject *module, PyObject *pystr)

/*[clinic end generated code: output=900950f95df3f1c9 input=d42ef714b2c07386]*/

{

return escape_unicode(pystr);

}

static void

scanner_dealloc(PyObject *self)

{

PyTypeObject *tp = Py_TYPE(self);

/* bpo-31095: UnTrack is needed before calling any callbacks */

PyObject_GC_UnTrack(self);

(void)scanner_clear(self);

tp->tp_free(self);

Py_DECREF(tp);

}

static int

scanner_traverse(PyObject *op, visitproc visit, void *arg)

{

PyScannerObject *self = PyScannerObject_CAST(op);

Py_VISIT(Py_TYPE(self));

Py_VISIT(self->object_hook);

Py_VISIT(self->object_pairs_hook);

Py_VISIT(self->parse_float);

Py_VISIT(self->parse_int);

Py_VISIT(self->parse_constant);

return 0;

}

static int

scanner_clear(PyObject *op)

{

PyScannerObject *self = PyScannerObject_CAST(op);

Py_CLEAR(self->object_hook);

Py_CLEAR(self->object_pairs_hook);

Py_CLEAR(self->parse_float);

Py_CLEAR(self->parse_int);

Py_CLEAR(self->parse_constant);

return 0;

}

static PyObject *

_parse_object_unicode(PyScannerObject *s, PyObject *memo, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr)

{

/* Read a JSON object from PyUnicode pystr.

idx is the index of the first character after the opening curly brace.

*next_idx_ptr is a return-by-reference index to the first character after

the closing curly brace.

Returns a new PyObject (usually a dict, but object_hook can change that)

const void *str;

int kind;

Py_ssize_t end_idx;

PyObject *val = NULL;

PyObject *rval = NULL;

PyObject *key = NULL;

int has_pairs_hook = (s->object_pairs_hook != Py_None);

Py_ssize_t next_idx;

Py_ssize_t comma_idx;

str = PyUnicode_DATA(pystr);

kind = PyUnicode_KIND(pystr);

end_idx = PyUnicode_GET_LENGTH(pystr) - 1;

if (has_pairs_hook)

rval = PyList_New(0);

else

rval = PyDict_New();

if (rval == NULL)

return NULL;

/* skip whitespace after { */

while (idx <= end_idx && IS_WHITESPACE(PyUnicode_READ(kind,str, idx))) idx++;

/* only loop if the object is non-empty */

if (idx > end_idx || PyUnicode_READ(kind, str, idx) != '}') {

while (1) {

PyObject *memokey;

/* read key */

if (idx > end_idx || PyUnicode_READ(kind, str, idx) != '"') {

raise_errmsg("Expecting property name enclosed in double quotes", pystr, idx);

goto bail;

}

key = scanstring_unicode(pystr, idx + 1, s->strict, &next_idx);

if (key == NULL)

goto bail;

if (PyDict_SetDefaultRef(memo, key, key, &memokey) < 0) {

goto bail;

}

Py_SETREF(key, memokey);

idx = next_idx;

/* skip whitespace between key and : delimiter, read :, skip whitespace */

while (idx <= end_idx && IS_WHITESPACE(PyUnicode_READ(kind, str, idx))) idx++;

if (idx > end_idx || PyUnicode_READ(kind, str, idx) != ':') {

raise_errmsg("Expecting ':' delimiter", pystr, idx);

goto bail;

}

idx++;

while (idx <= end_idx && IS_WHITESPACE(PyUnicode_READ(kind, str, idx))) idx++;

/* read any JSON term */

val = scan_once_unicode(s, memo, pystr, idx, &next_idx);

if (val == NULL)

goto bail;

if (has_pairs_hook) {

PyObject *item = PyTuple_Pack(2, key, val);

if (item == NULL)

goto bail;

Py_CLEAR(key);

Py_CLEAR(val);

if (PyList_Append(rval, item) == -1) {

Py_DECREF(item);

goto bail;

}

Py_DECREF(item);

}

else {

if (PyDict_SetItem(rval, key, val) < 0)

goto bail;

Py_CLEAR(key);

Py_CLEAR(val);

}

idx = next_idx;

/* skip whitespace before } or , */

while (idx <= end_idx && IS_WHITESPACE(PyUnicode_READ(kind, str, idx))) idx++;

/* bail if the object is closed or we didn't get the , delimiter */

if (idx <= end_idx && PyUnicode_READ(kind, str, idx) == '}')

break;

if (idx > end_idx || PyUnicode_READ(kind, str, idx) != ',') {

raise_errmsg("Expecting ',' delimiter", pystr, idx);

goto bail;

}

comma_idx = idx;

idx++;

/* skip whitespace after , delimiter */

while (idx <= end_idx && IS_WHITESPACE(PyUnicode_READ(kind, str, idx))) idx++;

if (idx <= end_idx && PyUnicode_READ(kind, str, idx) == '}') {

raise_errmsg("Illegal trailing comma before end of object", pystr, comma_idx);

goto bail;

}

*next_idx_ptr = idx + 1;

if (has_pairs_hook) {

val = PyObject_CallOneArg(s->object_pairs_hook, rval);

Py_DECREF(rval);

return val;

}

/* if object_hook is not None: rval = object_hook(rval) */

if (s->object_hook != Py_None) {

val = PyObject_CallOneArg(s->object_hook, rval);

Py_DECREF(rval);

return val;

}

return rval;

bail:

Py_XDECREF(key);

Py_XDECREF(val);

Py_XDECREF(rval);

return NULL;

}

static PyObject *

_parse_array_unicode(PyScannerObject *s, PyObject *memo, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr) {

/* Read a JSON array from PyUnicode pystr.

idx is the index of the first character after the opening brace.

*next_idx_ptr is a return-by-reference index to the first character after

the closing brace.

Returns a new PyList

const void *str;

int kind;

Py_ssize_t end_idx;

PyObject *val = NULL;

PyObject *rval;

Py_ssize_t next_idx;

Py_ssize_t comma_idx;

rval = PyList_New(0);

if (rval == NULL)

return NULL;

str = PyUnicode_DATA(pystr);

kind = PyUnicode_KIND(pystr);

end_idx = PyUnicode_GET_LENGTH(pystr) - 1;

/* skip whitespace after [ */

while (idx <= end_idx && IS_WHITESPACE(PyUnicode_READ(kind, str, idx))) idx++;

/* only loop if the array is non-empty */

if (idx > end_idx || PyUnicode_READ(kind, str, idx) != ']') {

while (1) {

/* read any JSON term */

val = scan_once_unicode(s, memo, pystr, idx, &next_idx);

if (val == NULL)

goto bail;

if (PyList_Append(rval, val) == -1)

goto bail;

Py_CLEAR(val);

idx = next_idx;

/* skip whitespace between term and , */

while (idx <= end_idx && IS_WHITESPACE(PyUnicode_READ(kind, str, idx))) idx++;

/* bail if the array is closed or we didn't get the , delimiter */

if (idx <= end_idx && PyUnicode_READ(kind, str, idx) == ']')

break;

if (idx > end_idx || PyUnicode_READ(kind, str, idx) != ',') {

raise_errmsg("Expecting ',' delimiter", pystr, idx);

goto bail;

}

comma_idx = idx;

idx++;

/* skip whitespace after , */

while (idx <= end_idx && IS_WHITESPACE(PyUnicode_READ(kind, str, idx))) idx++;

if (idx <= end_idx && PyUnicode_READ(kind, str, idx) == ']') {

raise_errmsg("Illegal trailing comma before end of array", pystr, comma_idx);

goto bail;

}

/* verify that idx < end_idx, PyUnicode_READ(kind, str, idx) should be ']' */

if (idx > end_idx || PyUnicode_READ(kind, str, idx) != ']') {

raise_errmsg("Expecting value", pystr, end_idx);

goto bail;

}

*next_idx_ptr = idx + 1;

return rval;

bail:

Py_XDECREF(val);

Py_DECREF(rval);

return NULL;

}

static PyObject *

_parse_constant(PyScannerObject *s, const char *constant, Py_ssize_t idx, Py_ssize_t *next_idx_ptr) {

/* Read a JSON constant.

constant is the constant string that was found

("NaN", "Infinity", "-Infinity").

idx is the index of the first character of the constant

*next_idx_ptr is a return-by-reference index to the first character after

the constant.

Returns the result of parse_constant

PyObject *cstr;

PyObject *rval;

/* constant is "NaN", "Infinity", or "-Infinity" */

cstr = PyUnicode_InternFromString(constant);

if (cstr == NULL)

return NULL;

/* rval = parse_constant(constant) */

rval = PyObject_CallOneArg(s->parse_constant, cstr);

idx += PyUnicode_GET_LENGTH(cstr);

Py_DECREF(cstr);

*next_idx_ptr = idx;

return rval;

}

static PyObject *

_match_number_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t start, Py_ssize_t *next_idx_ptr) {

/* Read a JSON number from PyUnicode pystr.

idx is the index of the first character of the number

*next_idx_ptr is a return-by-reference index to the first character after

the number.

Returns a new PyObject representation of that number:

PyLong, or PyFloat.

May return other types if parse_int or parse_float are set

const void *str;

int kind;

Py_ssize_t end_idx;

Py_ssize_t idx = start;

int is_float = 0;

PyObject *rval;

PyObject *numstr = NULL;

PyObject *custom_func;

str = PyUnicode_DATA(pystr);

kind = PyUnicode_KIND(pystr);

end_idx = PyUnicode_GET_LENGTH(pystr) - 1;

View remainder of file in raw view

cpython/Modules/_json.c at c3157480601499565fd42a8afbdb0207328ac484 · python/cpython · GitHub

Repository navigation

Expand file tree

Breadcrumbs

_json.c

Latest commit

History

Breadcrumbs

_json.c

File metadata and controls