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120 lines (88 loc) · 4.37 KB
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// ==========================================================================
// This software is subject to the provisions of the Zope Public License,
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
// FOR A PARTICULAR PURPOSE.
// ==========================================================================
using System;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Python.Runtime {
/// <summary>
/// Managed class that provides the implementation for reflected delegate
/// types. Delegates are represented in Python by generated type objects.
/// Each of those type objects is associated an instance of this class,
/// which provides its implementation.
/// </summary>
internal class DelegateObject : ClassBase {
MethodBinder binder;
internal DelegateObject(Type tp) : base(tp) {
binder = new MethodBinder(tp.GetMethod("Invoke"));
}
//====================================================================
// Given a PyObject pointer to an instance of a delegate type, return
// the true managed delegate the Python object represents (or null).
//====================================================================
private static Delegate GetTrueDelegate(IntPtr op) {
CLRObject o = GetManagedObject(op) as CLRObject;
if (o != null) {
Delegate d = o.inst as Delegate;
return d;
}
return null;
}
internal override bool CanSubclass() {
return false;
}
//====================================================================
// DelegateObject __new__ implementation. The result of this is a new
// PyObject whose type is DelegateObject and whose ob_data is a handle
// to an actual delegate instance. The method wrapped by the actual
// delegate instance belongs to an object generated to relay the call
// to the Python callable passed in.
//====================================================================
public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw) {
DelegateObject self = (DelegateObject)GetManagedObject(tp);
if (Runtime.PyTuple_Size(args) != 1) {
string message = "class takes exactly one argument";
return Exceptions.RaiseTypeError(message);
}
IntPtr method = Runtime.PyTuple_GetItem(args, 0);
if (Runtime.PyCallable_Check(method) != 1) {
return Exceptions.RaiseTypeError("argument must be callable");
}
Delegate d = PythonEngine.DelegateManager.GetDelegate(self.type, method);
return CLRObject.GetInstHandle(d, self.pyHandle);
}
//====================================================================
// Implements __call__ for reflected delegate types.
//====================================================================
public static IntPtr tp_call(IntPtr ob, IntPtr args, IntPtr kw) {
// todo: add fast type check!
IntPtr pytype = Runtime.PyObject_TYPE(ob);
DelegateObject self = (DelegateObject)GetManagedObject(pytype);
CLRObject o = GetManagedObject(ob) as CLRObject;
if (o == null) {
return Exceptions.RaiseTypeError("invalid argument");
}
Delegate d = o.inst as Delegate;
if (d == null) {
return Exceptions.RaiseTypeError("invalid argument");
}
return self.binder.Invoke(ob, args, kw);
}
//====================================================================
// Implements __cmp__ for reflected delegate types.
//====================================================================
public static new int tp_compare(IntPtr ob, IntPtr other) {
Delegate d1 = GetTrueDelegate(ob);
Delegate d2 = GetTrueDelegate(other);
if (d1 == d2) {
return 0;
}
return -1;
}
}
}