cpython/Objects/unicode_formatter.c at main · python/cpython · GitHub

History

1961 lines (1734 loc) · 62.1 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

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

/* implements the unicode (as opposed to string) version of the

built-in formatters for string, int, float. that is, the versions

of int.__float__, etc., that take and return unicode objects */

#include "Python.h"

#include "pycore_fileutils.h" // _Py_GetLocaleconvNumeric()

#include "pycore_long.h" // _PyLong_FormatWriter()

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

#include <locale.h>

/* _PyUnicode_InsertThousandsGrouping() helper functions */

typedef struct {

const char *grouping;

char previous;

Py_ssize_t i; /* Where we're currently pointing in grouping. */

} GroupGenerator;

static void

GroupGenerator_init(GroupGenerator *self, const char *grouping)

{

self->grouping = grouping;

self->i = 0;

self->previous = 0;

}

/* Returns the next grouping, or 0 to signify end. */

static Py_ssize_t

GroupGenerator_next(GroupGenerator *self)

{

/* Note that we don't really do much error checking here. If a

grouping string contains just CHAR_MAX, for example, then just

terminate the generator. That shouldn't happen, but at least we

fail gracefully. */

switch (self->grouping[self->i]) {

case 0:

return self->previous;

case CHAR_MAX:

/* Stop the generator. */

return 0;

default: {

char ch = self->grouping[self->i];

self->previous = ch;

self->i++;

return (Py_ssize_t)ch;

}

/* Fill in some digits, leading zeros, and thousands separator. All

are optional, depending on when we're called. */

static void

InsertThousandsGrouping_fill(_PyUnicodeWriter *writer, Py_ssize_t *buffer_pos,

PyObject *digits, Py_ssize_t *digits_pos,

Py_ssize_t n_chars, Py_ssize_t n_zeros,

PyObject *thousands_sep, Py_ssize_t thousands_sep_len,

Py_UCS4 *maxchar, int forward)

{

if (!writer) {

/* if maxchar > 127, maxchar is already set */

if (*maxchar == 127 && thousands_sep) {

Py_UCS4 maxchar2 = PyUnicode_MAX_CHAR_VALUE(thousands_sep);

*maxchar = Py_MAX(*maxchar, maxchar2);

}

return;

}

if (thousands_sep) {

if (!forward) {

*buffer_pos -= thousands_sep_len;

}

/* Copy the thousands_sep chars into the buffer. */

_PyUnicode_FastCopyCharacters(writer->buffer, *buffer_pos,

thousands_sep, 0,

thousands_sep_len);

if (forward) {

*buffer_pos += thousands_sep_len;

}

if (!forward) {

*buffer_pos -= n_chars;

*digits_pos -= n_chars;

}

_PyUnicode_FastCopyCharacters(writer->buffer, *buffer_pos,

digits, *digits_pos,

n_chars);

if (forward) {

*buffer_pos += n_chars;

*digits_pos += n_chars;

}

if (n_zeros) {

if (!forward) {

*buffer_pos -= n_zeros;

}

int kind = PyUnicode_KIND(writer->buffer);

void *data = PyUnicode_DATA(writer->buffer);

_PyUnicode_Fill(kind, data, '0', *buffer_pos, n_zeros);

if (forward) {

*buffer_pos += n_zeros;

}

/**

* InsertThousandsGrouping:

* @writer: Unicode writer.

* @n_buffer: Number of characters in @buffer.

* @digits: Digits we're reading from. If count is non-NULL, this is unused.

* @d_pos: Start of digits string.

* @n_digits: The number of digits in the string, in which we want

* to put the grouping chars.

* @min_width: The minimum width of the digits in the output string.

* Output will be zero-padded on the left to fill.

* @grouping: see definition in localeconv().

* @thousands_sep: see definition in localeconv().

* There are 2 modes: counting and filling. If @writer is NULL,

* we are in counting mode, else filling mode.

* If counting, the required buffer size is returned.

* If filling, we know the buffer will be large enough, so we don't

* need to pass in the buffer size.

* Inserts thousand grouping characters (as defined by grouping and

* thousands_sep) into @writer.

* Return value: -1 on error, number of characters otherwise.

**/

static Py_ssize_t

_PyUnicode_InsertThousandsGrouping(

_PyUnicodeWriter *writer,

Py_ssize_t n_buffer,

PyObject *digits,

Py_ssize_t d_pos,

Py_ssize_t n_digits,

Py_ssize_t min_width,

const char *grouping,

PyObject *thousands_sep,

Py_UCS4 *maxchar,

int forward)

{

min_width = Py_MAX(0, min_width);

if (writer) {

assert(digits != NULL);

assert(maxchar == NULL);

}

else {

assert(digits == NULL);

assert(maxchar != NULL);

}

assert(0 <= d_pos);

assert(0 <= n_digits);

assert(grouping != NULL);

Py_ssize_t count = 0;

Py_ssize_t n_zeros;

int loop_broken = 0;

int use_separator = 0; /* First time through, don't append the

separator. They only go between

groups. */

Py_ssize_t buffer_pos;

Py_ssize_t digits_pos;

Py_ssize_t len;

Py_ssize_t n_chars;

Py_ssize_t remaining = n_digits; /* Number of chars remaining to

be looked at */

/* A generator that returns all of the grouping widths, until it

returns 0. */

GroupGenerator groupgen;

GroupGenerator_init(&groupgen, grouping);

const Py_ssize_t thousands_sep_len = PyUnicode_GET_LENGTH(thousands_sep);

/* if digits are not grouped, thousands separator

should be an empty string */

assert(!(grouping[0] == CHAR_MAX && thousands_sep_len != 0));

digits_pos = d_pos + (forward ? 0 : n_digits);

if (writer) {

buffer_pos = writer->pos + (forward ? 0 : n_buffer);

assert(buffer_pos <= PyUnicode_GET_LENGTH(writer->buffer));

assert(digits_pos <= PyUnicode_GET_LENGTH(digits));

}

else {

buffer_pos = forward ? 0 : n_buffer;

}

if (!writer) {

*maxchar = 127;

}

while ((len = GroupGenerator_next(&groupgen)) > 0) {

len = Py_MIN(len, Py_MAX(Py_MAX(remaining, min_width), 1));

n_zeros = Py_MAX(0, len - remaining);

n_chars = Py_MAX(0, Py_MIN(remaining, len));

/* Use n_zero zero's and n_chars chars */

/* Count only, don't do anything. */

count += (use_separator ? thousands_sep_len : 0) + n_zeros + n_chars;

/* Copy into the writer. */

InsertThousandsGrouping_fill(writer, &buffer_pos,

digits, &digits_pos,

n_chars, n_zeros,

use_separator ? thousands_sep : NULL,

thousands_sep_len, maxchar, forward);

/* Use a separator next time. */

use_separator = 1;

remaining -= n_chars;

min_width -= len;

if (remaining <= 0 && min_width <= 0) {

loop_broken = 1;

break;

}

min_width -= thousands_sep_len;

}

if (!loop_broken) {

/* We left the loop without using a break statement. */

len = Py_MAX(Py_MAX(remaining, min_width), 1);

n_zeros = Py_MAX(0, len - remaining);

n_chars = Py_MAX(0, Py_MIN(remaining, len));

/* Use n_zero zero's and n_chars chars */

count += (use_separator ? thousands_sep_len : 0) + n_zeros + n_chars;

/* Copy into the writer. */

InsertThousandsGrouping_fill(writer, &buffer_pos,

digits, &digits_pos,

n_chars, n_zeros,

use_separator ? thousands_sep : NULL,

thousands_sep_len, maxchar, forward);

}

return count;

}

/* Raises an exception about an unknown presentation type for this

* type. */

static void

unknown_presentation_type(Py_UCS4 presentation_type,

const char* type_name)

{

/* %c might be out-of-range, hence the two cases. */

if (presentation_type > 32 && presentation_type < 128)

PyErr_Format(PyExc_ValueError,

"Unknown format code '%c' "

"for object of type '%.200s'",

(char)presentation_type,

type_name);

else

PyErr_Format(PyExc_ValueError,

"Unknown format code '\\x%x' "

"for object of type '%.200s'",

(unsigned int)presentation_type,

type_name);

}

static void

invalid_thousands_separator_type(char specifier, Py_UCS4 presentation_type)

{

assert(specifier == ',' || specifier == '_');

if (presentation_type > 32 && presentation_type < 128)

PyErr_Format(PyExc_ValueError,

"Cannot specify '%c' with '%c'.",

specifier, (char)presentation_type);

else

PyErr_Format(PyExc_ValueError,

"Cannot specify '%c' with '\\x%x'.",

specifier, (unsigned int)presentation_type);

}

static void

invalid_comma_and_underscore(void)

{

PyErr_Format(PyExc_ValueError, "Cannot specify both ',' and '_'.");

}

get_integer consumes 0 or more decimal digit characters from an

input string, updates *result with the corresponding positive

integer, and returns the number of digits consumed.

returns -1 on error.

static int

get_integer(PyObject *str, Py_ssize_t *ppos, Py_ssize_t end,

Py_ssize_t *result)

{

Py_ssize_t accumulator, digitval, pos = *ppos;

int numdigits;

int kind = PyUnicode_KIND(str);

const void *data = PyUnicode_DATA(str);

accumulator = numdigits = 0;

for (; pos < end; pos++, numdigits++) {

digitval = Py_UNICODE_TODECIMAL(PyUnicode_READ(kind, data, pos));

if (digitval < 0)

break;

Detect possible overflow before it happens:

accumulator * 10 + digitval > PY_SSIZE_T_MAX if and only if

accumulator > (PY_SSIZE_T_MAX - digitval) / 10.

if (accumulator > (PY_SSIZE_T_MAX - digitval) / 10) {

PyErr_Format(PyExc_ValueError,

"Too many decimal digits in format string");

*ppos = pos;

return -1;

}

accumulator = accumulator * 10 + digitval;

}

*ppos = pos;

*result = accumulator;

return numdigits;

}

/************************************************************************/

/*********** standard format specifier parsing **************************/

/************************************************************************/

/* returns true if this character is a specifier alignment token */

Py_LOCAL_INLINE(int)

is_alignment_token(Py_UCS4 c)

{

switch (c) {

case '<': case '>': case '=': case '^':

return 1;

default:

return 0;

}

/* returns true if this character is a sign element */

Py_LOCAL_INLINE(int)

is_sign_element(Py_UCS4 c)

{

switch (c) {

case ' ': case '+': case '-':

return 1;

default:

return 0;

}

/* Locale type codes. LT_NO_LOCALE must be zero. */

enum LocaleType {

LT_NO_LOCALE = 0,

LT_DEFAULT_LOCALE = ',',

LT_UNDERSCORE_LOCALE = '_',

LT_UNDER_FOUR_LOCALE,

LT_CURRENT_LOCALE

};

typedef struct {

Py_UCS4 fill_char;

Py_UCS4 align;

int alternate;

int no_neg_0;

Py_UCS4 sign;

Py_ssize_t width;

enum LocaleType thousands_separators;

Py_ssize_t precision;

enum LocaleType frac_thousands_separator;

Py_UCS4 type;

} InternalFormatSpec;

ptr points to the start of the format_spec, end points just past its end.

fills in format with the parsed information.

returns 1 on success, 0 on failure.

if failure, sets the exception

static int

parse_internal_render_format_spec(PyObject *obj,

PyObject *format_spec,

Py_ssize_t start, Py_ssize_t end,

InternalFormatSpec *format,

char default_type,

char default_align)

{

Py_ssize_t pos = start;

int kind = PyUnicode_KIND(format_spec);

const void *data = PyUnicode_DATA(format_spec);

/* end-pos is used throughout this code to specify the length of

the input string */

#define READ_spec(index) PyUnicode_READ(kind, data, index)

Py_ssize_t consumed;

int align_specified = 0;

int fill_char_specified = 0;

format->fill_char = ' ';

format->align = default_align;

format->alternate = 0;

format->no_neg_0 = 0;

format->sign = '\0';

format->width = -1;

format->thousands_separators = LT_NO_LOCALE;

format->frac_thousands_separator = LT_NO_LOCALE;

format->precision = -1;

format->type = default_type;

/* If the second char is an alignment token,

then parse the fill char */

if (end-pos >= 2 && is_alignment_token(READ_spec(pos+1))) {

format->align = READ_spec(pos+1);

format->fill_char = READ_spec(pos);

fill_char_specified = 1;

align_specified = 1;

pos += 2;

}

else if (end-pos >= 1 && is_alignment_token(READ_spec(pos))) {

format->align = READ_spec(pos);

align_specified = 1;

++pos;

}

/* Parse the various sign options */

if (end-pos >= 1 && is_sign_element(READ_spec(pos))) {

format->sign = READ_spec(pos);

++pos;

}

/* If the next character is z, request coercion of negative 0.

Applies only to floats. */

if (end-pos >= 1 && READ_spec(pos) == 'z') {

format->no_neg_0 = 1;

++pos;

}

/* If the next character is #, we're in alternate mode. This only

applies to integers. */

if (end-pos >= 1 && READ_spec(pos) == '#') {

format->alternate = 1;

++pos;

}

/* The special case for 0-padding (backwards compat) */

if (!fill_char_specified && end-pos >= 1 && READ_spec(pos) == '0') {

format->fill_char = '0';

if (!align_specified && default_align == '>') {

format->align = '=';

}

++pos;

}

consumed = get_integer(format_spec, &pos, end, &format->width);

if (consumed == -1)

/* Overflow error. Exception already set. */

return 0;

/* If consumed is 0, we didn't consume any characters for the

width. In that case, reset the width to -1, because

get_integer() will have set it to zero. -1 is how we record

that the width wasn't specified. */

if (consumed == 0)

format->width = -1;

/* Comma signifies add thousands separators */

if (end-pos && READ_spec(pos) == ',') {

format->thousands_separators = LT_DEFAULT_LOCALE;

++pos;

}

/* Underscore signifies add thousands separators */

if (end-pos && READ_spec(pos) == '_') {

if (format->thousands_separators != LT_NO_LOCALE) {

invalid_comma_and_underscore();

return 0;

}

format->thousands_separators = LT_UNDERSCORE_LOCALE;

++pos;

}

if (end-pos && READ_spec(pos) == ',') {

if (format->thousands_separators == LT_UNDERSCORE_LOCALE) {

invalid_comma_and_underscore();

return 0;

}

/* Parse field precision */

if (end-pos && READ_spec(pos) == '.') {

++pos;

consumed = get_integer(format_spec, &pos, end, &format->precision);

if (consumed == -1)

/* Overflow error. Exception already set. */

return 0;

if (end-pos && READ_spec(pos) == ',') {

if (consumed == 0) {

format->precision = -1;

}

format->frac_thousands_separator = LT_DEFAULT_LOCALE;

++pos;

++consumed;

}

if (end-pos && READ_spec(pos) == '_') {

if (format->frac_thousands_separator != LT_NO_LOCALE) {

invalid_comma_and_underscore();

return 0;

}

if (consumed == 0) {

format->precision = -1;

}

format->frac_thousands_separator = LT_UNDERSCORE_LOCALE;

++pos;

++consumed;

}

if (end-pos && READ_spec(pos) == ',') {

if (format->frac_thousands_separator == LT_UNDERSCORE_LOCALE) {

invalid_comma_and_underscore();

return 0;

}

/* Not having a precision or underscore/comma after a dot

is an error. */

if (consumed == 0) {

PyErr_Format(PyExc_ValueError,

"Format specifier missing precision");

return 0;

}

/* Finally, parse the type field. */

if (end-pos > 1) {

/* More than one char remains, so this is an invalid format

specifier. */

/* Create a temporary object that contains the format spec we're

operating on. It's format_spec[start:end] (in Python syntax). */

PyObject* actual_format_spec = PyUnicode_FromKindAndData(kind,

(char*)data + kind*start,

end-start);

if (actual_format_spec != NULL) {

PyErr_Format(PyExc_ValueError,

"Invalid format specifier '%U' for object of type '%.200s'",

actual_format_spec, Py_TYPE(obj)->tp_name);

Py_DECREF(actual_format_spec);

}

return 0;

}

if (end-pos == 1) {

format->type = READ_spec(pos);

++pos;

}

/* Do as much validating as we can, just by looking at the format

specifier. Do not take into account what type of formatting

we're doing (int, float, string). */

if (format->thousands_separators) {

switch (format->type) {

case 'd':

case 'e':

case 'f':

case 'g':

case 'E':

case 'G':

case '%':

case 'F':

case '\0':

/* These are allowed. See PEP 378.*/

break;

case 'b':

case 'o':

case 'x':

case 'X':

/* Underscores are allowed in bin/oct/hex. See PEP 515. */

if (format->thousands_separators == LT_UNDERSCORE_LOCALE) {

/* Every four digits, not every three, in bin/oct/hex. */

format->thousands_separators = LT_UNDER_FOUR_LOCALE;

break;

}

_Py_FALLTHROUGH;

default:

invalid_thousands_separator_type(format->thousands_separators, format->type);

return 0;

}

if (format->type == 'n'

&& format->frac_thousands_separator != LT_NO_LOCALE)

{

invalid_thousands_separator_type(format->frac_thousands_separator,

format->type);

return 0;

}

assert (format->align <= 127);

assert (format->sign <= 127);

return 1;

}

/* Calculate the padding needed. */

static void

calc_padding(Py_ssize_t nchars, Py_ssize_t width, Py_UCS4 align,

Py_ssize_t *n_lpadding, Py_ssize_t *n_rpadding,

Py_ssize_t *n_total)

{

if (width >= 0) {

if (nchars > width)

*n_total = nchars;

else

*n_total = width;

}

else {

/* not specified, use all of the chars and no more */

*n_total = nchars;

}

/* Figure out how much leading space we need, based on the

aligning */

if (align == '>')

*n_lpadding = *n_total - nchars;

else if (align == '^')

*n_lpadding = (*n_total - nchars) / 2;

else if (align == '<' || align == '=')

*n_lpadding = 0;

else {

/* We should never have an unspecified alignment. */

Py_UNREACHABLE();

}

*n_rpadding = *n_total - nchars - *n_lpadding;

}

/* Do the padding, and return a pointer to where the caller-supplied

content goes. */

static int

fill_padding(_PyUnicodeWriter *writer,

Py_ssize_t nchars,

Py_UCS4 fill_char, Py_ssize_t n_lpadding,

Py_ssize_t n_rpadding)

{

Py_ssize_t pos;

/* Pad on left. */

if (n_lpadding) {

pos = writer->pos;

_PyUnicode_FastFill(writer->buffer, pos, n_lpadding, fill_char);

}

/* Pad on right. */

if (n_rpadding) {

pos = writer->pos + nchars + n_lpadding;

_PyUnicode_FastFill(writer->buffer, pos, n_rpadding, fill_char);

}

/* Pointer to the user content. */

writer->pos += n_lpadding;

return 0;

}

/************************************************************************/

/*********** common routines for numeric formatting *********************/

/************************************************************************/

/* Locale info needed for formatting integers and the part of floats

before and including the decimal. Note that locales only support

8-bit chars, not unicode. */

typedef struct {

PyObject *decimal_point;

PyObject *thousands_sep;

PyObject *frac_thousands_sep;

const char *grouping;

char *grouping_buffer;

} LocaleInfo;

#define LocaleInfo_STATIC_INIT {0, 0, 0, 0}

/* describes the layout for an integer, see the comment in

calc_number_widths() for details */

typedef struct {

Py_ssize_t n_lpadding;

Py_ssize_t n_prefix;

Py_ssize_t n_spadding;

Py_ssize_t n_rpadding;

char sign;

Py_ssize_t n_sign; /* number of digits needed for sign (0/1) */

Py_ssize_t n_grouped_digits; /* Space taken up by the digits, including

any grouping chars. */

Py_ssize_t n_decimal; /* 0 if only an integer */

Py_ssize_t n_remainder; /* Digits in decimal and/or exponent part,

excluding the decimal itself, if

present. */

Py_ssize_t n_frac;

Py_ssize_t n_grouped_frac_digits;

/* These 2 are not the widths of fields, but are needed by

STRINGLIB_GROUPING. */

Py_ssize_t n_digits; /* The number of digits before a decimal

or exponent. */

Py_ssize_t n_min_width; /* The min_width we used when we computed

the n_grouped_digits width. */

} NumberFieldWidths;

/* Given a number of the form:

digits[remainder]

where ptr points to the start and end points to the end, find where

the integer part ends. This could be a decimal, an exponent, both,

or neither.

If a decimal point is present, set *has_decimal and increment

remainder beyond it.

Results are undefined (but shouldn't crash) for improperly

formatted strings.

static void

parse_number(PyObject *s, Py_ssize_t pos, Py_ssize_t end,

Py_ssize_t *n_remainder, Py_ssize_t *n_frac, int *has_decimal)

{

Py_ssize_t frac;

int kind = PyUnicode_KIND(s);

const void *data = PyUnicode_DATA(s);

while (pos<end && Py_ISDIGIT(PyUnicode_READ(kind, data, pos))) {

++pos;

}

frac = pos;

/* Does remainder start with a decimal point? */

*has_decimal = pos<end && PyUnicode_READ(kind, data, frac) == '.';

/* Skip the decimal point. */

if (*has_decimal) {

frac++;

pos++;

}

while (pos<end && Py_ISDIGIT(PyUnicode_READ(kind, data, pos))) {

++pos;

}

*n_frac = pos - frac;

*n_remainder = end - pos;

}

/* not all fields of format are used. for example, precision is

unused. should this take discrete params in order to be more clear

about what it does? or is passing a single format parameter easier

and more efficient enough to justify a little obfuscation?

Return -1 on error. */

static Py_ssize_t

calc_number_widths(NumberFieldWidths *spec, Py_ssize_t n_prefix,

Py_UCS4 sign_char, Py_ssize_t n_start,

Py_ssize_t n_end, Py_ssize_t n_remainder, Py_ssize_t n_frac,

int has_decimal, const LocaleInfo *locale,

const InternalFormatSpec *format, Py_UCS4 *maxchar)

{

Py_ssize_t n_non_digit_non_padding;

Py_ssize_t n_padding;

spec->n_digits = n_end - n_start - n_frac - n_remainder - (has_decimal?1:0);

spec->n_lpadding = 0;

spec->n_prefix = n_prefix;

spec->n_decimal = has_decimal ? PyUnicode_GET_LENGTH(locale->decimal_point) : 0;

spec->n_remainder = n_remainder;

spec->n_frac = n_frac;

spec->n_spadding = 0;

spec->n_rpadding = 0;

spec->sign = '\0';

spec->n_sign = 0;

/* the output will look like:

| |

| <lpadding> <sign> <prefix> <spadding> <grouped_digits> <decimal> <remainder> <rpadding> |

| |

sign is computed from format->sign and the actual

sign of the number

prefix is given (it's for the '0x' prefix)

digits is already known

the total width is either given, or computed from the

actual digits

only one of lpadding, spadding, and rpadding can be non-zero,

and it's calculated from the width and other fields

/* compute the various parts we're going to write */

switch (format->sign) {

case '+':

/* always put a + or - */

spec->n_sign = 1;

spec->sign = (sign_char == '-' ? '-' : '+');

break;

case ' ':

spec->n_sign = 1;

spec->sign = (sign_char == '-' ? '-' : ' ');

break;

default:

/* Not specified, or the default (-) */

if (sign_char == '-') {

spec->n_sign = 1;

spec->sign = '-';

}

if (spec->n_frac == 0) {

spec->n_grouped_frac_digits = 0;

}

else {

Py_UCS4 grouping_maxchar;

spec->n_grouped_frac_digits = _PyUnicode_InsertThousandsGrouping(

NULL, 0,

NULL, 0, spec->n_frac,

spec->n_frac,

locale->grouping, locale->frac_thousands_sep, &grouping_maxchar, 1);

if (spec->n_grouped_frac_digits == -1) {

return -1;

}

*maxchar = Py_MAX(*maxchar, grouping_maxchar);

}

/* The number of chars used for non-digits and non-padding. */

n_non_digit_non_padding = spec->n_sign + spec->n_prefix + spec->n_decimal +

+ spec->n_frac + spec->n_remainder;

/* min_width can go negative, that's okay. format->width == -1 means

we don't care. */

if (format->fill_char == '0' && format->align == '=')

spec->n_min_width = (format->width - n_non_digit_non_padding

+ spec->n_frac - spec->n_grouped_frac_digits);

else

spec->n_min_width = 0;

if (spec->n_digits == 0)

/* This case only occurs when using 'c' formatting, we need

to special case it because the grouping code always wants

to have at least one character. */

spec->n_grouped_digits = 0;

else {

Py_UCS4 grouping_maxchar;

spec->n_grouped_digits = _PyUnicode_InsertThousandsGrouping(

NULL, 0,

NULL, 0, spec->n_digits,

spec->n_min_width,

locale->grouping, locale->thousands_sep, &grouping_maxchar, 0);

if (spec->n_grouped_digits == -1) {

return -1;

}

*maxchar = Py_MAX(*maxchar, grouping_maxchar);

}

/* Given the desired width and the total of digit and non-digit

space we consume, see if we need any padding. format->width can

be negative (meaning no padding), but this code still works in

that case. */

n_padding = format->width -

(n_non_digit_non_padding + spec->n_grouped_digits

+ spec->n_grouped_frac_digits - spec->n_frac);

if (n_padding > 0) {

/* Some padding is needed. Determine if it's left, space, or right. */

switch (format->align) {

case '<':

spec->n_rpadding = n_padding;

break;

case '^':

spec->n_lpadding = n_padding / 2;

spec->n_rpadding = n_padding - spec->n_lpadding;

break;

case '=':

spec->n_spadding = n_padding;

break;

case '>':

spec->n_lpadding = n_padding;

break;

default:

/* Shouldn't get here */

Py_UNREACHABLE();

}

if (spec->n_lpadding || spec->n_spadding || spec->n_rpadding)

*maxchar = Py_MAX(*maxchar, format->fill_char);

if (spec->n_decimal)

*maxchar = Py_MAX(*maxchar, PyUnicode_MAX_CHAR_VALUE(locale->decimal_point));

return spec->n_lpadding + spec->n_sign + spec->n_prefix +

spec->n_spadding + spec->n_grouped_digits + spec->n_decimal +

spec->n_grouped_frac_digits + spec->n_remainder + spec->n_rpadding;

}

/* Fill in the digit parts of a number's string representation,

as determined in calc_number_widths().

Return -1 on error, or 0 on success. */

static int

fill_number(_PyUnicodeWriter *writer, const NumberFieldWidths *spec,

PyObject *digits, Py_ssize_t d_start,

PyObject *prefix, Py_ssize_t p_start,

Py_UCS4 fill_char,

LocaleInfo *locale, int toupper)

{

/* Used to keep track of digits, decimal, and remainder. */

Py_ssize_t d_pos = d_start;

const int kind = writer->kind;

const void *data = writer->data;

Py_ssize_t r;

if (spec->n_lpadding) {

_PyUnicode_FastFill(writer->buffer,

writer->pos, spec->n_lpadding, fill_char);

writer->pos += spec->n_lpadding;

}

if (spec->n_sign == 1) {

PyUnicode_WRITE(kind, data, writer->pos, spec->sign);

writer->pos++;

}

if (spec->n_prefix) {

_PyUnicode_FastCopyCharacters(writer->buffer, writer->pos,

prefix, p_start,

spec->n_prefix);

if (toupper) {

Py_ssize_t t;

for (t = 0; t < spec->n_prefix; t++) {

Py_UCS4 c = PyUnicode_READ(kind, data, writer->pos + t);

c = Py_TOUPPER(c);

assert (c <= 127);

PyUnicode_WRITE(kind, data, writer->pos + t, c);

}

writer->pos += spec->n_prefix;

}

if (spec->n_spadding) {

_PyUnicode_FastFill(writer->buffer,

writer->pos, spec->n_spadding, fill_char);

writer->pos += spec->n_spadding;

}

/* Only for type 'c' special case, it has no digits. */

if (spec->n_digits != 0) {

/* Fill the digits with InsertThousandsGrouping. */

r = _PyUnicode_InsertThousandsGrouping(

writer, spec->n_grouped_digits,

digits, d_pos, spec->n_digits,

spec->n_min_width,

locale->grouping, locale->thousands_sep, NULL, 0);

if (r == -1)

return -1;

assert(r == spec->n_grouped_digits);

d_pos += spec->n_digits;

}

if (toupper) {

Py_ssize_t t;

for (t = 0; t < spec->n_grouped_digits; t++) {

Py_UCS4 c = PyUnicode_READ(kind, data, writer->pos + t);

c = Py_TOUPPER(c);

if (c > 127) {

PyErr_SetString(PyExc_SystemError, "non-ascii grouped digit");

return -1;

}

PyUnicode_WRITE(kind, data, writer->pos + t, c);

}

writer->pos += spec->n_grouped_digits;

if (spec->n_decimal) {

_PyUnicode_FastCopyCharacters(

writer->buffer, writer->pos,

locale->decimal_point, 0, spec->n_decimal);

writer->pos += spec->n_decimal;

d_pos += 1;

}

if (spec->n_frac) {

r = _PyUnicode_InsertThousandsGrouping(

writer, spec->n_grouped_frac_digits,

digits, d_pos, spec->n_frac, spec->n_frac,

locale->grouping, locale->frac_thousands_sep, NULL, 1);

if (r == -1) {

return -1;

}

assert(r == spec->n_grouped_frac_digits);

d_pos += spec->n_frac;

writer->pos += spec->n_grouped_frac_digits;

}

if (spec->n_remainder) {

_PyUnicode_FastCopyCharacters(

writer->buffer, writer->pos,

digits, d_pos, spec->n_remainder);

View remainder of file in raw view

cpython/Objects/unicode_formatter.c at main · python/cpython · GitHub

Uh oh!

Uh oh!

cpython/Objects/unicode_formatter.c at main · python/cpython · GitHub

Uh oh!

Uh oh!

Expand file tree

Breadcrumbs

unicode_formatter.c

Latest commit

History

Breadcrumbs

unicode_formatter.c

File metadata and controls