pythonnet/src/runtime/converter.cs at refactor-qc-pythonnet4 · AlgoTradingSrc/pythonnet · GitHub

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using System;

using System.Collections;

using System.Collections.Generic;

using System.ComponentModel;

using System.Globalization;

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 NumberFormatInfo nfi;

private static Type objectType;

private static Type stringType;

private static Type singleType;

private static Type doubleType;

private static Type decimalType;

private static Type int16Type;

private static Type int32Type;

private static Type int64Type;

private static Type flagsType;

private static Type boolType;

private static Type typeType;

private static IntPtr dateTimeCtor;

private static IntPtr timeSpanCtor;

private static IntPtr tzInfoCtor;

static Converter()

{

nfi = NumberFormatInfo.InvariantInfo;

objectType = typeof(Object);

stringType = typeof(String);

int16Type = typeof(Int16);

int32Type = typeof(Int32);

int64Type = typeof(Int64);

singleType = typeof(Single);

doubleType = typeof(Double);

decimalType = typeof(Decimal);

flagsType = typeof(FlagsAttribute);

boolType = typeof(Boolean);

typeType = typeof(Type);

IntPtr dateTimeMod = Runtime.PyImport_ImportModule("datetime");

if (dateTimeMod == null) throw new PythonException();

dateTimeCtor = Runtime.PyObject_GetAttrString(dateTimeMod, "datetime");

if (dateTimeCtor == null) throw new PythonException();

timeSpanCtor = Runtime.PyObject_GetAttrString(dateTimeMod, "timedelta");

if (timeSpanCtor == null) throw new PythonException();

IntPtr tzInfoMod = PythonEngine.ModuleFromString("custom_tzinfo",

"from datetime import timedelta, tzinfo\n" +

"class GMT(tzinfo):\n" +

" def __init__(self, hours, minutes):\n" +

" self.hours = hours\n" +

" self.minutes = minutes\n" +

" def utcoffset(self, dt):\n" +

" return timedelta(hours=self.hours, minutes=self.minutes)\n" +

" def tzname(self, dt):\n" +

" return \"GMT {0:00}:{1:00}\".format(self.hours, self.minutes)\n" +

" def dst (self, dt):\n" +

" return timedelta(0)\n").Handle;

tzInfoCtor = Runtime.PyObject_GetAttrString(tzInfoMod, "GMT");

if (tzInfoCtor == null) throw new PythonException();

}

/// <summary>

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

/// </summary>

internal static Type GetTypeByAlias(IntPtr op)

{

if (op == Runtime.PyStringType)

return stringType;

if (op == Runtime.PyUnicodeType)

return stringType;

if (op == Runtime.PyIntType)

return int32Type;

if (op == Runtime.PyLongType)

return int64Type;

if (op == Runtime.PyFloatType)

return doubleType;

if (op == Runtime.PyBoolType)

return boolType;

return null;

}

internal static IntPtr GetPythonTypeByAlias(Type op)

{

if (op == stringType)

return Runtime.PyUnicodeType;

if (op == int16Type)

return Runtime.PyIntType;

if (op == int32Type)

return Runtime.PyIntType;

if (op == int64Type)

return Runtime.PyIntType;

if (op == doubleType)

return Runtime.PyFloatType;

if (op == singleType || op == decimalType)

return Runtime.PyFloatType;

if (op == boolType)

return Runtime.PyBoolType;

return IntPtr.Zero;

}

/// <summary>

/// Return a Python object for the given native object, converting

/// basic types (string, int, etc.) into equivalent Python objects.

/// This always returns a new reference. Note that the System.Decimal

/// type has no Python equivalent and converts to a managed instance.

/// </summary>

internal static IntPtr ToPython<T>(T value)

{

return 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 IntPtr ToPython(object value, Type type)

{

if (value is PyObject)

{

IntPtr handle = ((PyObject)value).Handle;

Runtime.XIncref(handle);

return handle;

}

IntPtr result = IntPtr.Zero;

// Null always converts to None in Python.

if (value == null)

{

result = Runtime.PyNone;

Runtime.XIncref(result);

return result;

}

if (Type.GetTypeCode(type) == TypeCode.Object && value.GetType() != typeof(object)) {

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

if (encoded != null) {

result = encoded.Handle;

Runtime.XIncref(result);

return result;

}

if (value is IList && !(value is INotifyPropertyChanged) && value.GetType().IsGenericType)

{

using (var resultlist = new PyList())

{

foreach (object o in (IEnumerable)value)

{

using (var p = new PyObject(ToPython(o, o?.GetType())))

{

resultlist.Append(p);

}

Runtime.XIncref(resultlist.Handle);

return resultlist.Handle;

}

if (type.IsInterface)

{

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

return ifaceObj.WrapObject(value);

}

// We need to special case interface array handling to ensure we

// produce the correct type. Value may be an array of some concrete

// type (FooImpl[]), but we want access to go via the interface type

// (IFoo[]).

if (type.IsArray && type.GetElementType().IsInterface)

{

return CLRObject.GetInstHandle(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.

var pyderived = value as IPythonDerivedType;

if (null != pyderived)

{

if (!IsTransparentProxy(pyderived))

return ClassDerivedObject.ToPython(pyderived);

}

// 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();

TypeCode tc = Type.GetTypeCode(type);

switch (tc)

{

case TypeCode.Object:

if (value is TimeSpan)

{

var timespan = (TimeSpan)value;

IntPtr timeSpanArgs = Runtime.PyTuple_New(1);

Runtime.PyTuple_SetItem(timeSpanArgs, 0, Runtime.PyFloat_FromDouble(timespan.TotalDays));

var returnTimeSpan = Runtime.PyObject_CallObject(timeSpanCtor, timeSpanArgs);

// clean up

Runtime.XDecref(timeSpanArgs);

return returnTimeSpan;

}

return CLRObject.GetInstHandle(value, type);

case TypeCode.String:

return Runtime.PyUnicode_FromString((string)value);

case TypeCode.Int32:

return Runtime.PyInt_FromInt32((int)value);

case TypeCode.Boolean:

if ((bool)value)

{

Runtime.XIncref(Runtime.PyTrue);

return Runtime.PyTrue;

}

Runtime.XIncref(Runtime.PyFalse);

return Runtime.PyFalse;

case TypeCode.Byte:

return Runtime.PyInt_FromInt32((int)((byte)value));

case TypeCode.Char:

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

case TypeCode.Int16:

return Runtime.PyInt_FromInt32((int)((short)value));

case TypeCode.Int64:

return Runtime.PyLong_FromLongLong((long)value);

case TypeCode.Single:

// return Runtime.PyFloat_FromDouble((double)((float)value));

string ss = ((float)value).ToString(nfi);

IntPtr ps = Runtime.PyString_FromString(ss);

NewReference op = Runtime.PyFloat_FromString(new BorrowedReference(ps));;

Runtime.XDecref(ps);

return op.DangerousMoveToPointerOrNull();

case TypeCode.Double:

return Runtime.PyFloat_FromDouble((double)value);

case TypeCode.SByte:

return Runtime.PyInt_FromInt32((int)((sbyte)value));

case TypeCode.UInt16:

return Runtime.PyInt_FromInt32((int)((ushort)value));

case TypeCode.UInt32:

return Runtime.PyLong_FromUnsignedLong((uint)value);

case TypeCode.UInt64:

return Runtime.PyLong_FromUnsignedLongLong((ulong)value);

case TypeCode.Decimal:

// C# decimal to python decimal has a big impact on performance

// so we will use C# double and python float

return Runtime.PyFloat_FromDouble(decimal.ToDouble((decimal)value));

case TypeCode.DateTime:

var datetime = (DateTime)value;

var size = datetime.Kind == DateTimeKind.Unspecified ? 7 : 8;

IntPtr dateTimeArgs = Runtime.PyTuple_New(size);

Runtime.PyTuple_SetItem(dateTimeArgs, 0, Runtime.PyInt_FromInt32(datetime.Year));

Runtime.PyTuple_SetItem(dateTimeArgs, 1, Runtime.PyInt_FromInt32(datetime.Month));

Runtime.PyTuple_SetItem(dateTimeArgs, 2, Runtime.PyInt_FromInt32(datetime.Day));

Runtime.PyTuple_SetItem(dateTimeArgs, 3, Runtime.PyInt_FromInt32(datetime.Hour));

Runtime.PyTuple_SetItem(dateTimeArgs, 4, Runtime.PyInt_FromInt32(datetime.Minute));

Runtime.PyTuple_SetItem(dateTimeArgs, 5, Runtime.PyInt_FromInt32(datetime.Second));

// datetime.datetime 6th argument represents micro seconds

var totalSeconds = datetime.TimeOfDay.TotalSeconds;

var microSeconds = Convert.ToInt32((totalSeconds - Math.Truncate(totalSeconds)) * 1000000);

if (microSeconds == 1000000) microSeconds = 999999;

Runtime.PyTuple_SetItem(dateTimeArgs, 6, Runtime.PyInt_FromInt32(microSeconds));

if (size == 8)

{

Runtime.PyTuple_SetItem(dateTimeArgs, 7, TzInfo(datetime.Kind));

}

var returnDateTime = Runtime.PyObject_CallObject(dateTimeCtor, dateTimeArgs);

// clean up

Runtime.XDecref(dateTimeArgs);

return returnDateTime;

default:

if (value is IEnumerable)

{

using (var resultlist = new PyList())

{

foreach (object o in (IEnumerable)value)

{

using (var p = new PyObject(ToPython(o, o?.GetType())))

{

resultlist.Append(p);

}

Runtime.XIncref(resultlist.Handle);

return resultlist.Handle;

}

result = CLRObject.GetInstHandle(value, type);

return result;

}

private static IntPtr TzInfo(DateTimeKind kind)

{

if (kind == DateTimeKind.Unspecified) return Runtime.PyNone;

var offset = kind == DateTimeKind.Local ? DateTimeOffset.Now.Offset : TimeSpan.Zero;

IntPtr tzInfoArgs = Runtime.PyTuple_New(2);

Runtime.PyTuple_SetItem(tzInfoArgs, 0, Runtime.PyFloat_FromDouble(offset.Hours));

Runtime.PyTuple_SetItem(tzInfoArgs, 1, Runtime.PyFloat_FromDouble(offset.Minutes));

var returnValue = Runtime.PyObject_CallObject(tzInfoCtor, tzInfoArgs);

Runtime.XDecref(tzInfoArgs);

return returnValue;

}

/// <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 IntPtr ToPythonImplicit(object value)

{

if (value == null)

{

IntPtr result = Runtime.PyNone;

Runtime.XIncref(result);

return result;

}

return ToPython(value, objectType);

}

internal static bool ToManaged(IntPtr value, Type type,

out object result, bool setError)

{

var usedImplicit = false;

return ToManaged(value, type, out result, setError, out usedImplicit);

}

/// <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(IntPtr value, Type type,

out object result, bool setError, out bool usedImplicit)

{

if (type.IsByRef)

{

type = type.GetElementType();

}

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

}

internal static bool ToManagedValue(BorrowedReference value, Type obType,

out object result, bool setError)

{

var usedImplicit = false;

return ToManagedValue(value.DangerousGetAddress(), obType, out result, setError, out usedImplicit);

}

internal static bool ToManagedValue(IntPtr value, Type obType,

out object result, bool setError, out bool usedImplicit)

{

usedImplicit = false;

if (obType == typeof(PyObject))

{

Runtime.XIncref(value); // PyObject() assumes ownership

result = new PyObject(value);

return true;

}

if (obType.IsGenericType && Runtime.PyObject_TYPE(value) == Runtime.PyListType)

{

var typeDefinition = obType.GetGenericTypeDefinition();

if (typeDefinition == typeof(List<>))

{

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

}

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

// instance, just return the wrapped object.

ManagedType mt = ManagedType.GetManagedObject(value);

result = null;

if (mt != null)

{

if (mt is CLRObject co)

{

object tmp = co.inst;

if (obType.IsInstanceOfType(tmp))

{

result = tmp;

return true;

}

else

{

var type = tmp.GetType();

// check implicit conversions that receive tmp type and return obType

var conversionMethod = type.GetMethod("op_Implicit", new[] { type });

if (conversionMethod != null && conversionMethod.ReturnType == obType)

{

result = conversionMethod.Invoke(null, new[] { tmp });

usedImplicit = true;

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;

}

if (mt is ClassBase cb)

{

if (!cb.type.Valid)

{

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

return false;

}

result = cb.type.Value;

return true;

}

// shouldn't happen

return false;

}

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);

}

if (obType.IsEnum)

{

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

}

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

// conversions (Python string -> managed string, Python int -> Int32 etc.).

if (obType == objectType)

{

if (Runtime.IsStringType(value))

{

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

}

if (Runtime.PyBool_Check(value))

{

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

}

if (Runtime.PyInt_Check(value))

{

return ToPrimitive(value, int32Type, out result, setError);

}

if (Runtime.PyLong_Check(value))

{

return ToPrimitive(value, int64Type, out result, setError);

}

if (Runtime.PyFloat_Check(value))

{

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

}

// give custom codecs a chance to take over conversion of sequences

IntPtr pyType = Runtime.PyObject_TYPE(value);

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

{

return true;

}

if (Runtime.PySequence_Check(value))

{

return ToArray(value, typeof(object[]), out result, setError);

}

Runtime.XIncref(value); // PyObject() assumes ownership

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.PyIntType)

{

result = int32Type;

return true;

}

if (value == Runtime.PyLongType)

{

result = int64Type;

return true;

}

if (value == Runtime.PyFloatType)

{

result = doubleType;

return true;

}

if (value == Runtime.PyListType || value == Runtime.PyTupleType)

{

result = typeof(object[]);

return true;

}

if (setError)

{

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

}

return false;

}

var underlyingType = Nullable.GetUnderlyingType(obType);

if (underlyingType != null)

{

return ToManagedValue(value, underlyingType, out result, setError, out usedImplicit);

}

TypeCode typeCode = Type.GetTypeCode(obType);

if (typeCode == TypeCode.Object)

{

IntPtr pyType = Runtime.PyObject_TYPE(value);

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

{

return true;

}

var opImplicit = obType.GetMethod("op_Implicit", new[] { obType });

if (opImplicit != null)

{

if (ToManagedValue(value, opImplicit.ReturnType, out result, setError, out usedImplicit))

{

opImplicit = obType.GetMethod("op_Implicit", new[] { result.GetType() });

if (opImplicit != null)

{

result = opImplicit.Invoke(null, new[] { result });

}

return opImplicit != null;

}

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

}

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

/// <summary>

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

/// </summary>

private static bool ToPrimitive(IntPtr value, Type obType, out object result, bool setError)

{

TypeCode tc = Type.GetTypeCode(obType);

result = null;

IntPtr op = IntPtr.Zero;

switch (tc)

{

case TypeCode.Object:

if (obType == typeof(TimeSpan))

{

op = Runtime.PyObject_Str(value);

TimeSpan ts;

var arr = Runtime.GetManagedString(op).Split(',');

string sts = arr.Length == 1 ? arr[0] : arr[1];

if (!TimeSpan.TryParse(sts, out ts))

{

goto type_error;

}

Runtime.XDecref(op);

int days = 0;

if (arr.Length > 1)

{

if (!int.TryParse(arr[0].Split(' ')[0].Trim(), out days))

{

goto type_error;

}

result = ts.Add(TimeSpan.FromDays(days));

return true;

}

break;

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:

result = Runtime.PyObject_IsTrue(value) != 0;

return true;

case TypeCode.Byte:

{

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

{

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

{

op = Runtime.PyBytes_AS_STRING(value);

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

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)

{

op = Runtime.PyBytes_AS_STRING(value);

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

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)

{

op = Runtime.PyBytes_AS_STRING(value);

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

return true;

}

goto type_error;

}

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

{

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

{

op = Runtime.PyUnicode_AsUnicode(value);

Char[] buff = new Char[1];

Marshal.Copy(op, buff, 0, 1);

result = buff[0];

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.PyLong_Check(value))

{

goto type_error;

}

long num = Runtime.PyExplicitlyConvertToInt64(value);

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

{

goto convert_error;

}

result = num;

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 == ulong.MaxValue && Exceptions.ErrorOccurred())

{

goto convert_error;

}

result = num;

return true;

}

case TypeCode.Single:

{

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:

{

double num = Runtime.PyFloat_AsDouble(value);

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

{

goto convert_error;

}

result = num;

return true;

}

case TypeCode.Decimal:

op = Runtime.PyObject_Str(value);

decimal m;

string sm = Runtime.GetManagedString(op);

if (!Decimal.TryParse(sm, NumberStyles.Number | NumberStyles.AllowExponent, nfi, out m))

{

goto type_error;

}

Runtime.XDecref(op);

result = m;

return true;

case TypeCode.DateTime:

op = Runtime.PyObject_Str(value);

DateTime dt;

string sdt = Runtime.GetManagedString(op);

if (!DateTime.TryParse(sdt, out dt))

{

goto type_error;

}

Runtime.XDecref(op);

result = dt;

return true;

default:

goto type_error;

}

convert_error:

if (op != value)

{

Runtime.XDecref(op);

}

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 (op != value)

{

Runtime.XDecref(op);

}

if (setError)

{

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

}

return false;

}

private static void SetConversionError(IntPtr value, Type target)

{

IntPtr ob = Runtime.PyObject_Repr(value);

string src = Runtime.GetManagedString(ob);

Runtime.XDecref(ob);

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(IntPtr value, Type obType, out object result, bool setError)

{

Type elementType = obType.GetElementType();

result = null;

IntPtr IterObject = Runtime.PyObject_GetIter(value);

if (IterObject == IntPtr.Zero || elementType.IsGenericType)

{

if (setError)

{

View remainder of file in raw view

pythonnet/src/runtime/converter.cs at refactor-qc-pythonnet4 · AlgoTradingSrc/pythonnet · GitHub

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