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overload.cs
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77 lines (64 loc) · 2.74 KB
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using System;
using System.Reflection;
namespace Python.Runtime
{
//========================================================================
// Implements the __overloads__ attribute of method objects. This object
// supports the [] syntax to explicitly select an overload by signature.
//========================================================================
internal class OverloadMapper : ExtensionType
{
MethodObject m;
IntPtr target;
public OverloadMapper(MethodObject m, IntPtr target) : base()
{
Runtime.Incref(target);
this.target = target;
this.m = m;
}
//====================================================================
// Implement explicit overload selection using subscript syntax ([]).
//====================================================================
public static IntPtr mp_subscript(IntPtr tp, IntPtr idx)
{
OverloadMapper self = (OverloadMapper)GetManagedObject(tp);
// Note: if the type provides a non-generic method with N args
// and a generic method that takes N params, then we always
// prefer the non-generic version in doing overload selection.
Type[] types = Runtime.PythonArgsToTypeArray(idx);
if (types == null)
{
return Exceptions.RaiseTypeError("type(s) expected");
}
MethodInfo mi = MethodBinder.MatchSignature(self.m.info, types);
if (mi == null)
{
string e = "No match found for signature";
return Exceptions.RaiseTypeError(e);
}
MethodBinding mb = new MethodBinding(self.m, self.target);
mb.info = mi;
Runtime.Incref(mb.pyHandle);
return mb.pyHandle;
}
//====================================================================
// OverloadMapper __repr__ implementation.
//====================================================================
public static IntPtr tp_repr(IntPtr op)
{
OverloadMapper self = (OverloadMapper)GetManagedObject(op);
IntPtr doc = self.m.GetDocString();
Runtime.Incref(doc);
return doc;
}
//====================================================================
// OverloadMapper dealloc implementation.
//====================================================================
public static new void tp_dealloc(IntPtr ob)
{
OverloadMapper self = (OverloadMapper)GetManagedObject(ob);
Runtime.Decref(self.target);
ExtensionType.FinalizeObject(self);
}
}
}