pythonnet/src/runtime/Converter.cs at just · pythonnet/pythonnet · 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

using System;

using System.Collections;

using System.Collections.Generic;

using System.Diagnostics;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Security;

namespace Python.Runtime

{

/// <summary>

/// Performs data conversions between managed types and Python types.

/// </summary>

[SuppressUnmanagedCodeSecurity]

internal class Converter

{

private Converter()

{

}

private static readonly Type objectType;

private static readonly Type stringType;

private static readonly Type singleType;

private static readonly Type doubleType;

private static readonly Type int16Type;

private static readonly Type int32Type;

private static readonly Type int64Type;

private static readonly Type boolType;

private static readonly Type typeType;

static Converter()

{

objectType = typeof(Object);

stringType = typeof(String);

int16Type = typeof(Int16);

int32Type = typeof(Int32);

int64Type = typeof(Int64);

singleType = typeof(Single);

doubleType = typeof(Double);

boolType = typeof(Boolean);

typeType = typeof(Type);

}

/// <summary>

/// Given a builtin Python type, return the corresponding CLR type.

/// </summary>

internal static Type? GetTypeByAlias(BorrowedReference op)

{

if (op == Runtime.PyStringType)

return stringType;

if (op == Runtime.PyUnicodeType)

return stringType;

if (op == Runtime.PyLongType)

return int32Type;

if (op == Runtime.PyLongType)

return int64Type;

if (op == Runtime.PyFloatType)

return doubleType;

if (op == Runtime.PyBoolType)

return boolType;

return null;

}

internal static BorrowedReference GetPythonTypeByAlias(Type op)

{

if (op == stringType)

return Runtime.PyUnicodeType.Reference;

if (op == int16Type)

return Runtime.PyLongType.Reference;

if (op == int32Type)

return Runtime.PyLongType.Reference;

if (op == int64Type)

return Runtime.PyLongType.Reference;

if (op == doubleType)

return Runtime.PyFloatType.Reference;

if (op == singleType)

return Runtime.PyFloatType.Reference;

if (op == boolType)

return Runtime.PyBoolType.Reference;

return BorrowedReference.Null;

}

internal static NewReference ToPython<T>(T value)

=> ToPython(value, typeof(T));

private static readonly Func<object, bool> IsTransparentProxy = GetIsTransparentProxy();

private static bool Never(object _) => false;

private static Func<object, bool> GetIsTransparentProxy()

{

var remoting = typeof(int).Assembly.GetType("System.Runtime.Remoting.RemotingServices");

if (remoting is null) return Never;

var isProxy = remoting.GetMethod("IsTransparentProxy", new[] { typeof(object) });

if (isProxy is null) return Never;

return (Func<object, bool>)Delegate.CreateDelegate(

typeof(Func<object, bool>), isProxy,

throwOnBindFailure: true);

}

internal static NewReference ToPythonDetectType(object? value)

=> value is null ? new NewReference(Runtime.PyNone) : ToPython(value, value.GetType());

internal static NewReference ToPython(object? value, Type type)

{

if (value is PyObject pyObj)

{

return new NewReference(pyObj);

}

// Null always converts to None in Python.

if (value == null)

{

return new NewReference(Runtime.PyNone);

}

if (EncodableByUser(type, value))

{

var encoded = PyObjectConversions.TryEncode(value, type);

if (encoded != null)

{

return new NewReference(encoded);

}

if (type.IsInterface)

{

var ifaceObj = (InterfaceObject)ClassManager.GetClassImpl(type);

return ifaceObj.TryWrapObject(value);

}

if (type.IsArray || type.IsEnum)

{

return CLRObject.GetReference(value, type);

}

// it the type is a python subclass of a managed type then return the

// underlying python object rather than construct a new wrapper object.

if (value is IPythonDerivedType pyderived)

{

if (!IsTransparentProxy(pyderived))

return ClassDerivedObject.ToPython(pyderived);

}

// ModuleObjects are created in a way that their wrapping them as

// a CLRObject fails, the ClassObject has no tpHandle. Return the

// pyHandle as is, do not convert.

if (value is ModuleObject)

{

throw new NotImplementedException();

}

// hmm - from Python, we almost never care what the declared

// type is. we'd rather have the object bound to the actual

// implementing class.

type = value.GetType();

if (type.IsEnum)

{

return CLRObject.GetReference(value, type);

}

TypeCode tc = Type.GetTypeCode(type);

switch (tc)

{

case TypeCode.Object:

return CLRObject.GetReference(value, type);

case TypeCode.String:

return Runtime.PyString_FromString((string)value);

case TypeCode.Int32:

return Runtime.PyInt_FromInt32((int)value);

case TypeCode.Boolean:

if ((bool)value)

{

return new NewReference(Runtime.PyTrue);

}

return new NewReference(Runtime.PyFalse);

case TypeCode.Byte:

return Runtime.PyInt_FromInt32((byte)value);

case TypeCode.Char:

return Runtime.PyUnicode_FromOrdinal((int)((char)value));

case TypeCode.Int16:

return Runtime.PyInt_FromInt32((short)value);

case TypeCode.Int64:

return Runtime.PyLong_FromLongLong((long)value);

case TypeCode.Single:

return Runtime.PyFloat_FromDouble((float)value);

case TypeCode.Double:

return Runtime.PyFloat_FromDouble((double)value);

case TypeCode.SByte:

return Runtime.PyInt_FromInt32((sbyte)value);

case TypeCode.UInt16:

return Runtime.PyInt_FromInt32((ushort)value);

case TypeCode.UInt32:

return Runtime.PyLong_FromUnsignedLongLong((uint)value);

case TypeCode.UInt64:

return Runtime.PyLong_FromUnsignedLongLong((ulong)value);

default:

return CLRObject.GetReference(value, type);

}

static bool EncodableByUser(Type type, object value)

{

TypeCode typeCode = Type.GetTypeCode(type);

return type.IsEnum

|| typeCode is TypeCode.DateTime or TypeCode.Decimal

|| typeCode == TypeCode.Object && value.GetType() != typeof(object) && value is not Type;

}

/// <summary>

/// In a few situations, we don't have any advisory type information

/// when we want to convert an object to Python.

/// </summary>

internal static NewReference ToPythonImplicit(object? value)

{

if (value == null)

{

return new NewReference(Runtime.PyNone);

}

return ToPython(value, objectType);

}

/// <summary>

/// Return a managed object for the given Python object, taking funny

/// byref types into account.

/// </summary>

/// <param name="value">A Python object</param>

/// <param name="type">The desired managed type</param>

/// <param name="result">Receives the managed object</param>

/// <param name="setError">If true, call <c>Exceptions.SetError</c> with the reason for failure.</param>

/// <returns>True on success</returns>

internal static bool ToManaged(BorrowedReference value, Type type,

out object? result, bool setError)

{

if (type.IsByRef)

{

type = type.GetElementType();

}

return Converter.ToManagedValue(value, type, out result, setError);

}

internal static bool ToManagedValue(BorrowedReference value, Type obType,

out object? result, bool setError)

{

if (obType == typeof(PyObject))

{

result = new PyObject(value);

return true;

}

if (obType.IsSubclassOf(typeof(PyObject))

&& !obType.IsAbstract

&& obType.GetConstructor(new[] { typeof(PyObject) }) is { } ctor)

{

var untyped = new PyObject(value);

result = ToPyObjectSubclass(ctor, untyped, setError);

return result is not null;

}

// Common case: if the Python value is a wrapped managed object

// instance, just return the wrapped object.

result = null;

switch (ManagedType.GetManagedObject(value))

{

case CLRObject co:

object tmp = co.inst;

if (obType.IsInstanceOfType(tmp))

{

result = tmp;

return true;

}

if (setError)

{

string typeString = tmp is null ? "null" : tmp.GetType().ToString();

Exceptions.SetError(Exceptions.TypeError, $"{typeString} value cannot be converted to {obType}");

}

return false;

case ClassBase cb:

if (!cb.type.Valid)

{

Exceptions.SetError(Exceptions.TypeError, cb.type.DeletedMessage);

return false;

}

result = cb.type.Value;

return true;

case null:

break;

default:

throw new ArgumentException("We should never receive instances of other managed types");

}

if (value == Runtime.PyNone && !obType.IsValueType)

{

result = null;

return true;

}

if (obType.IsGenericType && obType.GetGenericTypeDefinition() == typeof(Nullable<>))

{

if (value == Runtime.PyNone)

{

result = null;

return true;

}

// Set type to underlying type

obType = obType.GetGenericArguments()[0];

}

if (obType.ContainsGenericParameters)

{

if (setError)

{

Exceptions.SetError(Exceptions.TypeError, $"Cannot create an instance of the open generic type {obType}");

}

return false;

}

if (obType.IsArray)

{

return ToArray(value, obType, out result, setError);

}

// Conversion to 'Object' is done based on some reasonable default

// conversions (Python string -> managed string).

if (obType == objectType)

{

if (Runtime.PyString_CheckExact(value))

{

return ToPrimitive(value, stringType, out result, setError);

}

if (Runtime.PyBool_CheckExact(value))

{

return ToPrimitive(value, boolType, out result, setError);

}

if (Runtime.PyFloat_CheckExact(value))

{

return ToPrimitive(value, doubleType, out result, setError);

}

// give custom codecs a chance to take over conversion

// of ints, sequences, and types derived from primitives

BorrowedReference pyType = Runtime.PyObject_TYPE(value);

if (PyObjectConversions.TryDecode(value, pyType, obType, out result))

{

return true;

}

if (Runtime.PyString_Check(value))

{

return ToPrimitive(value, stringType, out result, setError);

}

if (Runtime.PyBool_Check(value))

{

return ToPrimitive(value, boolType, out result, setError);

}

if (Runtime.PyFloat_Check(value))

{

return ToPrimitive(value, doubleType, out result, setError);

}

if (Runtime.PyInt_Check(value))

{

result = new PyInt(value);

return true;

}

result = new PyObject(value);

return true;

}

// Conversion to 'Type' is done using the same mappings as above for objects.

if (obType == typeType)

{

if (value == Runtime.PyStringType)

{

result = stringType;

return true;

}

if (value == Runtime.PyBoolType)

{

result = boolType;

return true;

}

if (value == Runtime.PyLongType)

{

result = typeof(PyInt);

return true;

}

if (value == Runtime.PyFloatType)

{

result = doubleType;

return true;

}

if (value == Runtime.PyListType)

{

result = typeof(PyList);

return true;

}

if (value == Runtime.PyTupleType)

{

result = typeof(PyTuple);

return true;

}

if (setError)

{

Exceptions.SetError(Exceptions.TypeError, "value cannot be converted to Type");

}

return false;

}

if (DecodableByUser(obType))

{

BorrowedReference pyType = Runtime.PyObject_TYPE(value);

if (PyObjectConversions.TryDecode(value, pyType, obType, out result))

{

return true;

}

if (obType == typeof(System.Numerics.BigInteger)

&& Runtime.PyInt_Check(value))

{

using var pyInt = new PyInt(value);

result = pyInt.ToBigInteger();

return true;

}

return ToPrimitive(value, obType, out result, setError);

}

/// <remarks>

/// Unlike <see cref="ToManaged(BorrowedReference, Type, out object?, bool)"/>,

/// this method does not have a <c>setError</c> parameter, because it should

/// only be called after <see cref="ToManaged(BorrowedReference, Type, out object?, bool)"/>.

/// </remarks>

internal static bool ToManagedExplicit(BorrowedReference value, Type obType,

out object? result)

{

result = null;

// this method would potentially clean any existing error resulting in information loss

Debug.Assert(Runtime.PyErr_Occurred() == null);

string? converterName =

IsInteger(obType) ? "__int__"

: IsFloatingNumber(obType) ? "__float__"

: null;

if (converterName is null) return false;

Debug.Assert(obType.IsPrimitive);

using var converter = Runtime.PyObject_GetAttrString(value, converterName);

if (converter.IsNull())

{

Exceptions.Clear();

return false;

}

using var explicitlyCoerced = Runtime.PyObject_CallObject(converter.Borrow(), BorrowedReference.Null);

if (explicitlyCoerced.IsNull())

{

Exceptions.Clear();

return false;

}

return ToPrimitive(explicitlyCoerced.Borrow(), obType, out result, false);

}

static object? ToPyObjectSubclass(ConstructorInfo ctor, PyObject instance, bool setError)

{

try

{

return ctor.Invoke(new object[] { instance });

}

catch (TargetInvocationException ex)

{

if (setError)

{

Exceptions.SetError(ex.InnerException);

}

return null;

}

catch (SecurityException ex)

{

if (setError)

{

Exceptions.SetError(ex);

}

return null;

}

static bool DecodableByUser(Type type)

{

TypeCode typeCode = Type.GetTypeCode(type);

return type.IsEnum

|| typeCode is TypeCode.Object or TypeCode.Decimal or TypeCode.DateTime;

}

internal delegate bool TryConvertFromPythonDelegate(BorrowedReference pyObj, out object? result);

internal static int ToInt32(BorrowedReference value)

{

nint num = Runtime.PyLong_AsSignedSize_t(value);

if (num == -1 && Exceptions.ErrorOccurred())

{

throw PythonException.ThrowLastAsClrException();

}

return checked((int)num);

}

/// <summary>

/// Convert a Python value to an instance of a primitive managed type.

/// </summary>

internal static bool ToPrimitive(BorrowedReference value, Type obType, out object? result, bool setError)

{

result = null;

if (obType.IsEnum)

{

if (setError)

{

Exceptions.SetError(Exceptions.TypeError, "since Python.NET 3.0 int can not be converted to Enum implicitly. Use Enum(int_value)");

}

return false;

}

TypeCode tc = Type.GetTypeCode(obType);

switch (tc)

{

case TypeCode.String:

string? st = Runtime.GetManagedString(value);

if (st == null)

{

goto type_error;

}

result = st;

return true;

case TypeCode.Int32:

{

// Python3 always use PyLong API

nint num = Runtime.PyLong_AsSignedSize_t(value);

if (num == -1 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

if (num > Int32.MaxValue || num < Int32.MinValue)

{

goto overflow;

}

result = (int)num;

return true;

}

case TypeCode.Boolean:

if (value == Runtime.PyTrue)

{

result = true;

return true;

}

if (value == Runtime.PyFalse)

{

result = false;

return true;

}

if (setError)

{

goto type_error;

}

return false;

case TypeCode.Byte:

{

if (Runtime.PyObject_TypeCheck(value, Runtime.PyBytesType))

{

if (Runtime.PyBytes_Size(value) == 1)

{

IntPtr bytePtr = Runtime.PyBytes_AsString(value);

result = (byte)Marshal.ReadByte(bytePtr);

return true;

}

goto type_error;

}

nint num = Runtime.PyLong_AsSignedSize_t(value);

if (num == -1 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

if (num > Byte.MaxValue || num < Byte.MinValue)

{

goto overflow;

}

result = (byte)num;

return true;

}

case TypeCode.SByte:

{

if (Runtime.PyObject_TypeCheck(value, Runtime.PyBytesType))

{

if (Runtime.PyBytes_Size(value) == 1)

{

IntPtr bytePtr = Runtime.PyBytes_AsString(value);

result = (sbyte)Marshal.ReadByte(bytePtr);

return true;

}

goto type_error;

}

nint num = Runtime.PyLong_AsSignedSize_t(value);

if (num == -1 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

if (num > SByte.MaxValue || num < SByte.MinValue)

{

goto overflow;

}

result = (sbyte)num;

return true;

}

case TypeCode.Char:

{

if (Runtime.PyObject_TypeCheck(value, Runtime.PyBytesType))

{

if (Runtime.PyBytes_Size(value) == 1)

{

IntPtr bytePtr = Runtime.PyBytes_AsString(value);

result = (char)Marshal.ReadByte(bytePtr);

return true;

}

goto type_error;

}

else if (Runtime.PyObject_TypeCheck(value, Runtime.PyUnicodeType))

{

if (Runtime.PyUnicode_GetLength(value) == 1)

{

int chr = Runtime.PyUnicode_ReadChar(value, 0);

result = (Char)chr;

return true;

}

goto type_error;

}

nint num = Runtime.PyLong_AsSignedSize_t(value);

if (num == -1 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

if (num > Char.MaxValue || num < Char.MinValue)

{

goto overflow;

}

result = (char)num;

return true;

}

case TypeCode.Int16:

{

nint num = Runtime.PyLong_AsSignedSize_t(value);

if (num == -1 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

if (num > Int16.MaxValue || num < Int16.MinValue)

{

goto overflow;

}

result = (short)num;

return true;

}

case TypeCode.Int64:

{

if (Runtime.Is32Bit)

{

if (!Runtime.PyInt_Check(value))

{

goto type_error;

}

long? num = Runtime.PyLong_AsLongLong(value);

if (num is null)

{

goto convert_error;

}

result = num.Value;

return true;

}

else

{

nint num = Runtime.PyLong_AsSignedSize_t(value);

if (num == -1 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

result = (long)num;

return true;

}

case TypeCode.UInt16:

{

nint num = Runtime.PyLong_AsSignedSize_t(value);

if (num == -1 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

if (num > UInt16.MaxValue || num < UInt16.MinValue)

{

goto overflow;

}

result = (ushort)num;

return true;

}

case TypeCode.UInt32:

{

nuint num = Runtime.PyLong_AsUnsignedSize_t(value);

if (num == unchecked((nuint)(-1)) && Exceptions.ErrorOccurred())

{

goto convert_error;

}

if (num > UInt32.MaxValue)

{

goto overflow;

}

result = (uint)num;

return true;

}

case TypeCode.UInt64:

{

ulong? num = Runtime.PyLong_AsUnsignedLongLong(value);

if (num is null)

{

goto convert_error;

}

result = num.Value;

return true;

}

case TypeCode.Single:

{

if (!Runtime.PyFloat_Check(value) && !Runtime.PyInt_Check(value))

{

goto type_error;

}

double num = Runtime.PyFloat_AsDouble(value);

if (num == -1.0 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

if (num > Single.MaxValue || num < Single.MinValue)

{

if (!double.IsInfinity(num))

{

goto overflow;

}

result = (float)num;

return true;

}

case TypeCode.Double:

{

if (!Runtime.PyFloat_Check(value) && !Runtime.PyInt_Check(value))

{

goto type_error;

}

double num = Runtime.PyFloat_AsDouble(value);

if (num == -1.0 && Exceptions.ErrorOccurred())

{

goto convert_error;

}

result = num;

return true;

}

default:

goto type_error;

}

convert_error:

if (!setError)

{

Exceptions.Clear();

}

return false;

type_error:

if (setError)

{

string tpName = Runtime.PyObject_GetTypeName(value);

Exceptions.SetError(Exceptions.TypeError, $"'{tpName}' value cannot be converted to {obType}");

}

return false;

overflow:

// C# level overflow error

if (setError)

{

Exceptions.SetError(Exceptions.OverflowError, "value too large to convert");

}

return false;

}

private static void SetConversionError(BorrowedReference value, Type target)

{

// PyObject_Repr might clear the error

Runtime.PyErr_Fetch(out var causeType, out var causeVal, out var causeTrace);

var ob = Runtime.PyObject_Repr(value);

string src = "'object has no repr'";

if (ob.IsNull())

{

Exceptions.Clear();

}

else

{

src = Runtime.GetManagedString(ob.Borrow()) ?? src;

}

ob.Dispose();

Runtime.PyErr_Restore(causeType.StealNullable(), causeVal.StealNullable(), causeTrace.StealNullable());

Exceptions.RaiseTypeError($"Cannot convert {src} to {target}");

}

/// <summary>

/// Convert a Python value to a correctly typed managed array instance.

/// The Python value must support the Python iterator protocol or and the

/// items in the sequence must be convertible to the target array type.

/// </summary>

private static bool ToArray(BorrowedReference value, Type obType, out object? result, bool setError)

{

Type elementType = obType.GetElementType();

result = null;

using var IterObject = Runtime.PyObject_GetIter(value);

if (IterObject.IsNull())

{

if (setError)

{

SetConversionError(value, obType);

}

else

{

// PyObject_GetIter will have set an error

Exceptions.Clear();

}

return false;

}

IList list;

try

{

// MakeGenericType can throw because elementType may not be a valid generic argument even though elementType[] is a valid array type.

// For example, if elementType is a pointer type.

// See https://docs.microsoft.com/en-us/dotnet/api/system.type.makegenerictype#System_Type_MakeGenericType_System_Type

var constructedListType = typeof(List<>).MakeGenericType(elementType);

bool IsSeqObj = Runtime.PySequence_Check(value);

object[] constructorArgs = Array.Empty<object>();

if (IsSeqObj)

{

var len = Runtime.PySequence_Size(value);

if (len >= 0)

{

if (len <= int.MaxValue)

{

constructorArgs = new object[] { (int)len };

}

else

{

// for the sequences, that explicitly deny calling __len__()

Exceptions.Clear();

}

// CreateInstance can throw even if MakeGenericType succeeded.

// See https://docs.microsoft.com/en-us/dotnet/api/system.activator.createinstance#System_Activator_CreateInstance_System_Type_

list = (IList)Activator.CreateInstance(constructedListType, args: constructorArgs);

}

catch (Exception e)

{

if (setError)

{

Exceptions.SetError(e);

SetConversionError(value, obType);

}

return false;

}

while (true)

{

using var item = Runtime.PyIter_Next(IterObject.Borrow());

if (item.IsNull()) break;

if (!Converter.ToManaged(item.Borrow(), elementType, out var obj, setError))

{

return false;

}

list.Add(obj);

}

if (Exceptions.ErrorOccurred())

{

if (!setError) Exceptions.Clear();

return false;

}

Array items = Array.CreateInstance(elementType, list.Count);

list.CopyTo(items, 0);

result = items;

return true;

}

internal static bool IsFloatingNumber(Type type) => type == typeof(float) || type == typeof(double);

internal static bool IsInteger(Type type)

=> type == typeof(Byte) || type == typeof(SByte)

|| type == typeof(Int16) || type == typeof(UInt16)

|| type == typeof(Int32) || type == typeof(UInt32)

|| type == typeof(Int64) || type == typeof(UInt64);

}

public static class ConverterExtension

{

public static PyObject ToPython(this object? o)

{

if (o is null) return Runtime.None;

return Converter.ToPython(o, o.GetType()).MoveToPyObject();

}

public static PyObject ToPythonAs<T>(this T? o)

{

if (o is null) return Runtime.None;

return Converter.ToPython(o, typeof(T)).MoveToPyObject();

}

pythonnet/src/runtime/Converter.cs at just · pythonnet/pythonnet · GitHub

Repository navigation

Expand file tree

Breadcrumbs

Converter.cs

Latest commit

History

Breadcrumbs

Converter.cs

File metadata and controls