/// <summary>
/// Convert a Python value to an instance of a primitive managed type.
/// </summary>
private 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)
{
IntPtr unicodePtr = Runtime.PyUnicode_AsUnicode(value);
Char[] buff = new Char[1];
Marshal.Copy(unicodePtr, 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.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);
}
