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PropertyObject.cs
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190 lines (166 loc) · 5.59 KB
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using System;
using System.Reflection;
using System.Runtime.Serialization;
namespace Python.Runtime
{
using MaybeMethodInfo = MaybeMethodBase<MethodInfo>;
/// <summary>
/// Implements a Python descriptor type that manages CLR properties.
/// </summary>
[Serializable]
internal class PropertyObject : ExtensionType, IDeserializationCallback
{
internal MaybeMemberInfo<PropertyInfo> info;
[NonSerialized]
private MethodInfo? getter;
[NonSerialized]
private MethodInfo? setter;
public PropertyObject(PropertyInfo md)
{
info = new MaybeMemberInfo<PropertyInfo>(md);
CacheAccessors();
}
void CacheAccessors()
{
PropertyInfo md = info.Value;
getter = md.GetGetMethod(true) ?? md.GetBaseGetMethod(true);
setter = md.GetSetMethod(true) ?? md.GetBaseSetMethod(true);
}
/// <summary>
/// Descriptor __get__ implementation. This method returns the
/// value of the property on the given object. The returned value
/// is converted to an appropriately typed Python object.
/// </summary>
public static NewReference tp_descr_get(BorrowedReference ds, BorrowedReference ob, BorrowedReference tp)
{
var self = (PropertyObject)GetManagedObject(ds)!;
if (!self.info.Valid)
{
return Exceptions.RaiseTypeError(self.info.DeletedMessage);
}
var info = self.info.Value;
MethodInfo? getter = self.getter;
object result;
if (getter == null)
{
return Exceptions.RaiseTypeError("property cannot be read");
}
if (ob == null || ob == Runtime.PyNone)
{
if (!getter.IsStatic)
{
return new NewReference(ds);
}
try
{
result = info.GetValue(null, null);
return Converter.ToPython(result, info.PropertyType);
}
catch (Exception e)
{
return Exceptions.RaiseTypeError(e.Message);
}
}
var co = GetManagedObject(ob) as CLRObject;
if (co == null)
{
return Exceptions.RaiseTypeError("invalid target");
}
try
{
result = getter.Invoke(co.inst, Array.Empty<object>());
return Converter.ToPython(result, info.PropertyType);
}
catch (Exception e)
{
if (e.InnerException != null)
{
e = e.InnerException;
}
Exceptions.SetError(e);
return default;
}
}
/// <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 static int tp_descr_set(BorrowedReference ds, BorrowedReference ob, BorrowedReference val)
{
var self = (PropertyObject)GetManagedObject(ds)!;
if (!self.info.Valid)
{
Exceptions.RaiseTypeError(self.info.DeletedMessage);
return -1;
}
var info = self.info.Value;
MethodInfo? setter = self.setter;
if (val == null)
{
Exceptions.RaiseTypeError("cannot delete property");
return -1;
}
if (setter == null)
{
Exceptions.RaiseTypeError("property is read-only");
return -1;
}
if (!Converter.ToManaged(val, info.PropertyType, out var newval, true))
{
return -1;
}
bool is_static = setter.IsStatic;
if (ob == null || 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;
}
setter.Invoke(co.inst, new object?[] { newval });
}
else
{
info.SetValue(null, newval, null);
}
return 0;
}
catch (Exception e)
{
if (e.InnerException != null)
{
e = e.InnerException;
}
Exceptions.SetError(e);
return -1;
}
}
/// <summary>
/// Descriptor __repr__ implementation.
/// </summary>
public static NewReference tp_repr(BorrowedReference ob)
{
var self = (PropertyObject)GetManagedObject(ob)!;
return Runtime.PyString_FromString($"<property '{self.info}'>");
}
void IDeserializationCallback.OnDeserialization(object sender)
{
if (info.Valid)
{
CacheAccessors();
}
}
}
}