| private PySequence_Check ( IntPtr pointer ) : bool | ||
| pointer | IntPtr | |
| return | bool | |
static IntPtr HandleParamsArray(IntPtr args, int arrayStart, int pyArgCount, out bool isNewReference)
{
isNewReference = false;
IntPtr op;
// for a params method, we may have a sequence or single/multiple items
// here we look to see if the item at the paramIndex is there or not
// and then if it is a sequence itself.
if ((pyArgCount - arrayStart) == 1)
{
// we only have one argument left, so we need to check it
// to see if it is a sequence or a single item
IntPtr item = Runtime.PyTuple_GetItem(args, arrayStart);
if (!Runtime.PyString_Check(item) && Runtime.PySequence_Check(item))
{
// it's a sequence (and not a string), so we use it as the op
op = item;
}
else
{
isNewReference = true;
op = Runtime.PyTuple_GetSlice(args, arrayStart, pyArgCount);
}
}
else
{
isNewReference = true;
op = Runtime.PyTuple_GetSlice(args, arrayStart, pyArgCount);
}
return(op);
}
static IntPtr HandleParamsArray(IntPtr args, int arrayStart, int pyArgCount, out bool isNewReference)
{
isNewReference = false;
IntPtr op;
// for a params method, we may have a sequence or single/multiple items
// here we look to see if the item at the paramIndex is there or not
// and then if it is a sequence itself.
if ((pyArgCount - arrayStart) == 1)
{
// Ee only have one argument left, so we need to check to see if it is a sequence or a single item
// We also need to check if this object is possibly a wrapped C# Enumerable Object
IntPtr item = Runtime.PyTuple_GetItem(args, arrayStart);
if (!Runtime.PyString_Check(item) && (Runtime.PySequence_Check(item) || (ManagedType.GetManagedObject(item) as CLRObject)?.inst is IEnumerable))
{
// it's a sequence (and not a string), so we use it as the op
op = item;
}
else
{
// Its a single value that needs to be converted into the params array
isNewReference = true;
op = Runtime.PyTuple_GetSlice(args, arrayStart, pyArgCount);
}
}
else
{
// Its a set of individual values, so we grab them as a tuple to be converted into the params array
isNewReference = true;
op = Runtime.PyTuple_GetSlice(args, arrayStart, pyArgCount);
}
return(op);
}
/// <summary>
/// Helper function for ToArray and ToList that creates a IList out of iterable objects
/// </summary>
/// <param name="value"></param>
/// <param name="IterObject"></param>
/// <param name="obType"></param>
/// <param name="elementType"></param>
/// <param name="setError"></param>
/// <returns></returns>
private static IList MakeList(IntPtr value, IntPtr IterObject, Type obType, Type elementType, bool setError)
{
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);
if (IsSeqObj)
{
var len = Runtime.PySequence_Size(value);
list = (IList)Activator.CreateInstance(constructedListType, new Object[] { (int)len });
}
else
{
// 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);
}
}
catch (Exception e)
{
if (setError)
{
Exceptions.SetError(e);
SetConversionError(value, obType);
}
return(null);
}
IntPtr item;
var usedImplicit = false;
while ((item = Runtime.PyIter_Next(IterObject)) != IntPtr.Zero)
{
object obj;
if (!Converter.ToManaged(item, elementType, out obj, setError, out usedImplicit))
{
Runtime.XDecref(item);
return(null);
}
list.Add(obj);
Runtime.XDecref(item);
}
Runtime.XDecref(IterObject);
return(list);
}
/// <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;
bool IsSeqObj = Runtime.PySequence_Check(value);
var len = IsSeqObj ? Runtime.PySequence_Size(value) : -1;
IntPtr IterObject = Runtime.PyObject_GetIter(value);
if (IterObject == IntPtr.Zero)
{
if (setError)
{
SetConversionError(value, obType);
}
return(false);
}
Array items;
var listType = typeof(List <>);
var constructedListType = listType.MakeGenericType(elementType);
IList list = IsSeqObj ? (IList)Activator.CreateInstance(constructedListType, new Object[] { (int)len }) :
(IList)Activator.CreateInstance(constructedListType);
IntPtr item;
while ((item = Runtime.PyIter_Next(IterObject)) != IntPtr.Zero)
{
object obj = null;
if (!Converter.ToManaged(item, elementType, out obj, true))
{
Runtime.XDecref(item);
return(false);
}
list.Add(obj);
Runtime.XDecref(item);
}
Runtime.XDecref(IterObject);
items = Array.CreateInstance(elementType, list.Count);
list.CopyTo(items, 0);
result = items;
return(true);
}
internal static bool ToManagedValue(IntPtr value, Type obType,
out object result, bool setError)
{
if (obType == typeof(PyObject))
{
Runtime.XIncref(value); // PyObject() assumes ownership
result = new PyObject(value);
return(true);
}
// 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)
{
object tmp = ((CLRObject)mt).inst;
if (obType.IsInstanceOfType(tmp))
{
result = tmp;
return(true);
}
Exceptions.SetError(Exceptions.TypeError, $"value cannot be converted to {obType}");
return(false);
}
if (mt is ClassBase)
{
var cb = (ClassBase)mt;
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.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);
}
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);
}
}
return(ToPrimitive(value, obType, out result, setError));
}
/// <summary>
/// IsSequenceType Method
/// </summary>
///
/// <remarks>
/// Returns true if the given object implements the sequence protocol.
/// </remarks>
public static bool IsSequenceType(PyObject value)
{
return(Runtime.PySequence_Check(value.obj));
}
internal static bool ToManagedValue(IntPtr value, Type obType,
out object result, bool setError)
{
if (obType == typeof(PyObject))
{
Runtime.XIncref(value); // PyObject() assumes ownership
result = new PyObject(value);
return(true);
}
// 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)
{
object tmp = ((CLRObject)mt).inst;
if (obType.IsInstanceOfType(tmp))
{
result = tmp;
return(true);
}
Exceptions.SetError(Exceptions.TypeError, $"value cannot be converted to {obType}");
return(false);
}
if (mt is ClassBase)
{
result = ((ClassBase)mt).type;
return(true);
}
// shouldn't happen
return(false);
}
if (value == Runtime.PyNone && !obType.IsValueType)
{
result = null;
return(true);
}
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));
}
if (Runtime.PySequence_Check(value))
{
return(ToArray(value, typeof(object[]), out result, setError));
}
if (setError)
{
Exceptions.SetError(Exceptions.TypeError, "value cannot be converted to Object");
}
return(false);
}
// 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);
}
return(ToPrimitive(value, obType, out result, setError));
}
internal static bool ToManagedValue(IntPtr value, Type obType,
out Object result, bool 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;
// XXX - hack to support objects wrapped in old-style classes
// (such as exception objects).
if (Runtime.wrap_exceptions)
{
if (mt == null)
{
if (Runtime.PyObject_IsInstance(
value, Exceptions.Exception
) > 0)
{
IntPtr p = Runtime.PyObject_GetAttrString(value, "_inner");
if (p != IntPtr.Zero)
{
// This is safe because we know that the __dict__ of
// value holds a reference to _inner.
value = p;
Runtime.Decref(p);
mt = ManagedType.GetManagedObject(value);
}
}
IntPtr c = Exceptions.UnwrapExceptionClass(value);
if ((c != IntPtr.Zero) && (c != value))
{
value = c;
Runtime.Decref(c);
mt = ManagedType.GetManagedObject(value);
}
}
}
if (mt != null)
{
if (mt is CLRObject)
{
object tmp = ((CLRObject)mt).inst;
if (obType.IsInstanceOfType(tmp))
{
result = tmp;
return(true);
}
string err = "value cannot be converted to {0}";
err = String.Format(err, obType);
Exceptions.SetError(Exceptions.TypeError, err);
return(false);
}
if (mt is ClassBase)
{
result = ((ClassBase)mt).type;
return(true);
}
// shouldnt happen
return(false);
}
if (value == Runtime.PyNone && !obType.IsValueType)
{
result = null;
return(true);
}
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));
}
else if (Runtime.PyBool_Check(value))
{
return(ToPrimitive(value, boolType, out result, setError));
}
else if (Runtime.PyInt_Check(value))
{
return(ToPrimitive(value, int32Type, out result, setError));
}
else if (Runtime.PyLong_Check(value))
{
return(ToPrimitive(value, int64Type, out result, setError));
}
else if (Runtime.PyFloat_Check(value))
{
return(ToPrimitive(value, doubleType, out result, setError));
}
else if (Runtime.PySequence_Check(value))
{
return(ToArray(value, typeof(object[]), out result,
setError));
}
if (setError)
{
Exceptions.SetError(Exceptions.TypeError,
"value cannot be converted to Object"
);
}
return(false);
}
// Conversion to 'Type' is done using the same mappings as above
// for objects.
if (obType == typeType)
{
if (value == Runtime.PyStringType)
{
result = stringType;
return(true);
}
else if (value == Runtime.PyBoolType)
{
result = boolType;
return(true);
}
else if (value == Runtime.PyIntType)
{
result = int32Type;
return(true);
}
else if (value == Runtime.PyLongType)
{
result = int64Type;
return(true);
}
else if (value == Runtime.PyFloatType)
{
result = doubleType;
return(true);
}
else 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);
}
return(ToPrimitive(value, obType, out result, setError));
}
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));
}
/// <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 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.IsStringType(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));
}
// give custom codecs a chance to take over conversion of ints and sequences
BorrowedReference pyType = Runtime.PyObject_TYPE(value);
if (PyObjectConversions.TryDecode(value, pyType, obType, out result))
{
return(true);
}
if (Runtime.PyInt_Check(value))
{
result = new PyInt(value);
return(true);
}
if (Runtime.PySequence_Check(value))
{
return(ToArray(value, typeof(object[]), out result, setError));
}
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);
}
}
return(ToPrimitive(value, obType, out result, setError));
}
/// <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)
{
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);
if (IsSeqObj)
{
var len = Runtime.PySequence_Size(value);
list = (IList)Activator.CreateInstance(constructedListType, new Object[] { (int)len });
}
else
{
// 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);
}
}
catch (Exception e)
{
if (setError)
{
Exceptions.SetError(e);
SetConversionError(value, obType);
}
return(false);
}
IntPtr item;
while ((item = Runtime.PyIter_Next(IterObject)) != IntPtr.Zero)
{
object obj;
if (!Converter.ToManaged(item, elementType, out obj, setError))
{
Runtime.XDecref(item);
return(false);
}
list.Add(obj);
Runtime.XDecref(item);
}
Runtime.XDecref(IterObject);
Array items = Array.CreateInstance(elementType, list.Count);
list.CopyTo(items, 0);
result = items;
return(true);
}