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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.Collections.Generic;

namespace Python.Runtime {

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

// Implements a Python binding type for CLR methods. These work much like

// standard Python method bindings, but the same type is used to bind

// both static and instance methods.

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

internal class MethodBinding : ExtensionType {

internal MethodInfo info;

internal MethodObject m;

internal IntPtr target;

internal IntPtr targetType;

public MethodBinding(MethodObject m, IntPtr target, IntPtr targetType) : base() {

Runtime.Incref(target);

this.target = target;

Runtime.Incref(targetType);

if (targetType == IntPtr.Zero)

targetType = Runtime.PyObject_Type(target);

this.targetType = targetType;

this.info = null;

this.m = m;

}

public MethodBinding(MethodObject m, IntPtr target) : this(m, target, IntPtr.Zero)

{

}

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

// Implement binding of generic methods using the subscript syntax [].

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

public static IntPtr mp_subscript(IntPtr tp, IntPtr idx) {

MethodBinding self = (MethodBinding)GetManagedObject(tp);

Type[] types = Runtime.PythonArgsToTypeArray(idx);

if (types == null) {

return Exceptions.RaiseTypeError("type(s) expected");

}

MethodInfo mi = MethodBinder.MatchParameters(self.m.info, types);

if (mi == null) {

string e = "No match found for given type params";

return Exceptions.RaiseTypeError(e);

}

MethodBinding mb = new MethodBinding(self.m, self.target);

mb.info = mi;

Runtime.Incref(mb.pyHandle);

return mb.pyHandle;

}

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

// MethodBinding __getattribute__ implementation.

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

public static IntPtr tp_getattro(IntPtr ob, IntPtr key) {

MethodBinding self = (MethodBinding)GetManagedObject(ob);

if (!Runtime.PyString_Check(key)) {

Exceptions.SetError(Exceptions.TypeError, "string expected");

return IntPtr.Zero;

}

string name = Runtime.GetManagedString(key);

if (name == "__doc__") {

IntPtr doc = self.m.GetDocString();

Runtime.Incref(doc);

return doc;

}

// XXX deprecate __overloads__ soon...

if (name == "__overloads__" || name == "Overloads") {

OverloadMapper om = new OverloadMapper(self.m, self.target);

Runtime.Incref(om.pyHandle);

return om.pyHandle;

}

return Runtime.PyObject_GenericGetAttr(ob, key);

}

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

// MethodBinding __call__ implementation.

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

public static IntPtr tp_call(IntPtr ob, IntPtr args, IntPtr kw) {

MethodBinding self = (MethodBinding)GetManagedObject(ob);

// This works around a situation where the wrong generic method is picked,

// for example this method in the tests: string Overloaded<T>(int arg1, int arg2, string arg3)

if (self.info != null)

{

if (self.info.IsGenericMethod)

{

int len = Runtime.PyTuple_Size(args);

Type[] sigTp = Runtime.PythonArgsToTypeArray(args, true);

if (sigTp != null)

{

Type[] genericTp = self.info.GetGenericArguments();

MethodInfo betterMatch = MethodBinder.MatchSignatureAndParameters(self.m.info, genericTp, sigTp);

if (betterMatch != null) self.info = betterMatch;

}

// This supports calling a method 'unbound', passing the instance

// as the first argument. Note that this is not supported if any

// of the overloads are static since we can't know if the intent

// was to call the static method or the unbound instance method.

List<IntPtr> disposeList = new List<IntPtr>();

try

{

IntPtr target = self.target;

if ((target == IntPtr.Zero) && (!self.m.IsStatic()))

{

int len = Runtime.PyTuple_Size(args);

if (len < 1)

{

Exceptions.SetError(Exceptions.TypeError, "not enough arguments");

return IntPtr.Zero;

}

target = Runtime.PyTuple_GetItem(args, 0);

Runtime.Incref(target);

disposeList.Add(target);

args = Runtime.PyTuple_GetSlice(args, 1, len);

disposeList.Add(args);

}

// if the class is a IPythonDerivedClass and target is not the same as self.targetType

// (eg if calling the base class method) then call the original base class method instead

// of the target method.

IntPtr superType = IntPtr.Zero;

if (Runtime.PyObject_TYPE(target) != self.targetType)

{

CLRObject inst = CLRObject.GetManagedObject(target) as CLRObject;

if (inst != null && (inst.inst as IPythonDerivedType) != null)

{

ClassBase baseType = GetManagedObject(self.targetType) as ClassBase;

if (baseType != null)

{

string baseMethodName = "_" + baseType.type.Name + "__" + self.m.name;

IntPtr baseMethod = Runtime.PyObject_GetAttrString(target, baseMethodName);

if (baseMethod != IntPtr.Zero)

{

MethodBinding baseSelf = GetManagedObject(baseMethod) as MethodBinding;

if (baseSelf != null)

self = baseSelf;

Runtime.Decref(baseMethod);

}

else

{

Runtime.PyErr_Clear();

}

return self.m.Invoke(target, args, kw, self.info);

}

finally

{

foreach (IntPtr ptr in disposeList)

Runtime.Decref(ptr);

}

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

// MethodBinding __hash__ implementation.

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

public static IntPtr tp_hash(IntPtr ob) {

MethodBinding self = (MethodBinding)GetManagedObject(ob);

long x = 0;

long y = 0;

if (self.target != IntPtr.Zero) {

x = Runtime.PyObject_Hash(self.target).ToInt64();

if (x == -1) {

return new IntPtr(-1);

}

y = Runtime.PyObject_Hash(self.m.pyHandle).ToInt64();

if (y == -1) {

return new IntPtr(-1);

}

x ^= y;

if (x == -1) {

x = -1;

}

return new IntPtr(x);

}

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

// MethodBinding __repr__ implementation.

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

public static IntPtr tp_repr(IntPtr ob) {

MethodBinding self = (MethodBinding)GetManagedObject(ob);

string type = (self.target == IntPtr.Zero) ? "unbound" : "bound";

string s = String.Format("<{0} method '{1}'>", type, self.m.name);

return Runtime.PyString_FromStringAndSize(s, s.Length);

}

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

// MethodBinding dealloc implementation.

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

public static new void tp_dealloc(IntPtr ob) {

MethodBinding self = (MethodBinding)GetManagedObject(ob);

Runtime.Decref(self.target);

Runtime.Decref(self.targetType);

ExtensionType.FinalizeObject(self);

}