// ==========================================================================

// 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.Collections;

using System.Runtime.InteropServices;

namespace Python.Runtime {

/// <summary>

/// A MethodWrapper wraps a static method of a managed type,

/// making it callable by Python as a PyCFunction object. This is

/// currently used mainly to implement special cases like the CLR

/// import hook.

/// </summary>

internal class MethodWrapper {

public IntPtr mdef;

public IntPtr ptr;

public MethodWrapper(Type type, string name) {

// Turn the managed method into a function pointer

IntPtr fp = Interop.GetThunk(type.GetMethod(name));

// XXX - here we create a Python string object, then take the

// char * of the internal string to pass to our methoddef

// structure. Its a hack, and the name is leaked!

#if (PYTHON32 || PYTHON33 || PYTHON34)

IntPtr ps = Runtime.PyBytes_FromString(name);

IntPtr sp = Runtime.PyBytes_AS_STRING(ps);

#else

IntPtr ps = Runtime.PyString_FromString(name);

IntPtr sp = Runtime.PyString_AS_STRING(ps);

#endif

// Allocate and initialize a PyMethodDef structure to represent

// the managed method, then create a PyCFunction.

mdef = Runtime.PyMem_Malloc(4 * IntPtr.Size);

Marshal.WriteIntPtr(mdef, sp);

Marshal.WriteIntPtr(mdef, (1 * IntPtr.Size), fp);

Marshal.WriteIntPtr(mdef, (2 * IntPtr.Size), (IntPtr)0x0003); // METH_VARARGS | METH_KEYWORDS

Marshal.WriteIntPtr(mdef, (3 * IntPtr.Size), IntPtr.Zero);

ptr = Runtime.PyCFunction_NewEx(mdef, IntPtr.Zero, IntPtr.Zero);

}

public IntPtr Call(IntPtr args, IntPtr kw) {

return Runtime.PyCFunction_Call(ptr, args, kw);

}

}

}