/// <summary>
/// Descriptor __set__ implementation. This method sets the value of
/// a field based on the given Python value. The Python value must be
/// convertible to the type of the field.
/// </summary>
public new static int tp_descr_set(IntPtr ds, IntPtr ob, IntPtr val)
{
var self = (FieldObject)GetManagedObject(ds);
object newval;
if (self == null)
{
return(-1);
}
if (val == IntPtr.Zero)
{
Exceptions.SetError(Exceptions.TypeError, "cannot delete field");
return(-1);
}
FieldInfo info = self.info;
if (info.IsLiteral || info.IsInitOnly)
{
Exceptions.SetError(Exceptions.TypeError, "field is read-only");
return(-1);
}
bool is_static = info.IsStatic;
if (ob == IntPtr.Zero || ob == Runtime.PyNone)
{
if (!is_static)
{
Exceptions.SetError(Exceptions.TypeError, "instance attribute must be set through a class instance");
return(-1);
}
}
if (!Converter.ToManaged(val, info.FieldType, out newval, true))
{
return(-1);
}
try
{
if (!is_static)
{
var co = (CLRObject)GetManagedObject(ob);
info.SetValue(co.inst, newval);
}
else
{
info.SetValue(null, newval);
}
return(0);
}
catch (Exception e)
{
Exceptions.SetError(Exceptions.TypeError, e.Message);
return(-1);
}
}
/// <summary>
/// Implements __new__ for reflected classes and value types.
/// </summary>
public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw)
{
var self = GetManagedObject(tp) as ClassObject;
// Sanity check: this ensures a graceful error if someone does
// something intentially wrong like use the managed metatype for
// a class that is not really derived from a managed class.
if (self == null)
{
return(Exceptions.RaiseTypeError("invalid object"));
}
Type type = self.type;
// Primitive types do not have constructors, but they look like
// they do from Python. If the ClassObject represents one of the
// convertible primitive types, just convert the arg directly.
if (type.IsPrimitive || type == typeof(string))
{
if (Runtime.PyTuple_Size(args) != 1)
{
Exceptions.SetError(Exceptions.TypeError, "no constructors match given arguments");
return(IntPtr.Zero);
}
IntPtr op = Runtime.PyTuple_GetItem(args, 0);
object result;
if (!Converter.ToManaged(op, type, out result, true))
{
return(IntPtr.Zero);
}
return(CLRObject.GetInstHandle(result, tp));
}
if (type.IsAbstract)
{
Exceptions.SetError(Exceptions.TypeError, "cannot instantiate abstract class");
return(IntPtr.Zero);
}
if (type.IsEnum)
{
Exceptions.SetError(Exceptions.TypeError, "cannot instantiate enumeration");
return(IntPtr.Zero);
}
object obj = self.binder.InvokeRaw(IntPtr.Zero, args, kw);
if (obj == null)
{
return(IntPtr.Zero);
}
return(CLRObject.GetInstHandle(obj, tp));
}
/// <summary>
/// AsManagedObject Method
/// </summary>
/// <remarks>
/// Return a managed object of the given type, based on the
/// value of the Python object.
/// </remarks>
public object AsManagedObject(Type t)
{
object result;
if (!Converter.ToManaged(obj, t, out result, false))
{
throw new InvalidCastException("cannot convert object to target type");
}
return(result);
}
/// <summary>
/// As Method
/// </summary>
/// <remarks>
/// Return a managed object of the given type, based on the
/// value of the Python object.
/// </remarks>
public T As <T>()
{
if (typeof(T) == typeof(PyObject) || typeof(T) == typeof(object))
{
return((T)(this as object));
}
object result;
if (!Converter.ToManaged(obj, typeof(T), out result, false))
{
throw new InvalidCastException("cannot convert object to target type");
}
return((T)result);
}
public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw)
{
var self = GetManagedObject(tp) as ArrayObject;
if (Runtime.PyTuple_Size(args) != 1)
{
return(Exceptions.RaiseTypeError("array expects 1 argument"));
}
IntPtr op = Runtime.PyTuple_GetItem(args, 0);
object result;
if (!Converter.ToManaged(op, self.type, out result, true))
{
return(IntPtr.Zero);
}
return(CLRObject.GetInstHandle(result, tp));
}
/// <summary>
/// Convert a Python value to a correctly typed managed array instance.
/// The Python value must support the Python sequence protocol 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();
var size = Runtime.PySequence_Size(value);
result = null;
if (size < 0)
{
if (setError)
{
SetConversionError(value, obType);
}
return(false);
}
Array items = Array.CreateInstance(elementType, size);
// XXX - is there a better way to unwrap this if it is a real array?
for (var i = 0; i < size; i++)
{
object obj = null;
IntPtr item = Runtime.PySequence_GetItem(value, i);
if (item == IntPtr.Zero)
{
if (setError)
{
SetConversionError(value, obType);
return(false);
}
}
if (!Converter.ToManaged(item, elementType, out obj, true))
{
Runtime.XDecref(item);
return(false);
}
items.SetValue(obj, i);
Runtime.XDecref(item);
}
result = items;
return(true);
}
/// <summary>
/// Implements __contains__ for array types.
/// </summary>
public static int sq_contains(IntPtr ob, IntPtr v)
{
var obj = (CLRObject)GetManagedObject(ob);
Type itemType = obj.inst.GetType().GetElementType();
var items = obj.inst as IList;
object value;
if (!Converter.ToManaged(v, itemType, out value, false))
{
return(0);
}
if (items.Contains(value))
{
return(1);
}
return(0);
}
public object TrueDispatch(ArrayList args)
{
MethodInfo method = dtype.GetMethod("Invoke");
ParameterInfo[] pi = method.GetParameters();
IntPtr pyargs = Runtime.PyTuple_New(pi.Length);
Type rtype = method.ReturnType;
for (var i = 0; i < pi.Length; i++)
{
// Here we own the reference to the Python value, and we
// give the ownership to the arg tuple.
IntPtr arg = Converter.ToPython(args[i], pi[i].ParameterType);
Runtime.PyTuple_SetItem(pyargs, i, arg);
}
IntPtr op = Runtime.PyObject_Call(target, pyargs, IntPtr.Zero);
Runtime.XDecref(pyargs);
if (op == IntPtr.Zero)
{
var e = new PythonException();
throw e;
}
if (rtype == typeof(void))
{
return(null);
}
object result = null;
if (!Converter.ToManaged(op, rtype, out result, false))
{
Runtime.XDecref(op);
throw new ConversionException($"could not convert Python result to {rtype}");
}
Runtime.XDecref(op);
return(result);
}
static bool TryConvertArgument(IntPtr op, Type parameterType, bool needsResolution,
out object arg, out bool isOut)
{
arg = null;
isOut = false;
var clrtype = TryComputeClrArgumentType(parameterType, op, needsResolution: needsResolution);
if (clrtype == null)
{
return(false);
}
if (!Converter.ToManaged(op, clrtype, out arg, false))
{
Exceptions.Clear();
return(false);
}
isOut = clrtype.IsByRef;
return(true);
}
/// <summary>
/// Implements __setitem__ for array types.
/// </summary>
public static int mp_ass_subscript(IntPtr ob, IntPtr idx, IntPtr v)
{
var obj = (CLRObject)GetManagedObject(ob);
var items = obj.inst as Array;
Type itemType = obj.inst.GetType().GetElementType();
int rank = items.Rank;
int index;
object value;
if (items.IsReadOnly)
{
Exceptions.RaiseTypeError("array is read-only");
return(-1);
}
if (!Converter.ToManaged(v, itemType, out value, true))
{
return(-1);
}
if (rank == 1)
{
index = Runtime.PyInt_AsLong(idx);
if (Exceptions.ErrorOccurred())
{
Exceptions.RaiseTypeError("invalid index value");
return(-1);
}
if (index < 0)
{
index = items.Length + index;
}
try {
items.SetValue(value, index);
}
catch (IndexOutOfRangeException) {
Exceptions.SetError(Exceptions.IndexError, "array index out of range");
return(-1);
}
return(0);
}
if (!Runtime.PyTuple_Check(idx))
{
Exceptions.RaiseTypeError("invalid index value");
return(-1);
}
var count = Runtime.PyTuple_Size(idx);
var args = new int[count];
for (var i = 0; i < count; i++)
{
IntPtr op = Runtime.PyTuple_GetItem(idx, i);
index = Runtime.PyInt_AsLong(op);
if (Exceptions.ErrorOccurred())
{
Exceptions.RaiseTypeError("invalid index value");
return(-1);
}
if (index < 0)
{
index = items.GetLength(i) + index;
}
args.SetValue(index, i);
}
try {
items.SetValue(value, args);
}
catch (IndexOutOfRangeException) {
Exceptions.SetError(Exceptions.IndexError, "array index out of range");
return(-1);
}
return(0);
}
/// <summary>
/// Descriptor __set__ implementation. This method sets the value of
/// a property based on the given Python value. The Python value must
/// be convertible to the type of the property.
/// </summary>
public new static int tp_descr_set(IntPtr ds, IntPtr ob, IntPtr val)
{
var self = (PropertyObject)GetManagedObject(ds);
MethodInfo setter = self.setter;
object newval;
if (val == IntPtr.Zero)
{
Exceptions.RaiseTypeError("cannot delete property");
return(-1);
}
if (setter == null)
{
Exceptions.RaiseTypeError("property is read-only");
return(-1);
}
if (!Converter.ToManaged(val, self.info.PropertyType, out newval, true))
{
return(-1);
}
bool is_static = setter.IsStatic;
if (ob == IntPtr.Zero || ob == Runtime.PyNone)
{
if (!is_static)
{
Exceptions.RaiseTypeError("instance property must be set on an instance");
return(-1);
}
}
try {
if (!is_static)
{
var co = GetManagedObject(ob) as CLRObject;
if (co == null)
{
Exceptions.RaiseTypeError("invalid target");
return(-1);
}
self.info.SetValue(co.inst, newval, null);
}
else
{
self.info.SetValue(null, newval, null);
}
return(0);
}
catch (Exception e) {
if (e.InnerException != null)
{
e = e.InnerException;
}
Exceptions.SetError(e);
return(-1);
}
}
public override bool TryConvert(ConvertBinder binder, out object result)
{
return(Converter.ToManaged(this.obj, binder.Type, out result, false));
}
