internal override bool TryGetValue(CodeContext context, object instance, PythonType owner, out object value)
{
if (instance == null)
{
value = this;
return(true);
}
IWeakReferenceable reference;
if (context.GetPythonContext().TryConvertToWeakReferenceable(instance, out reference))
{
WeakRefTracker tracker = reference.GetWeakRef();
if (tracker == null || tracker.HandlerCount == 0)
{
value = null;
}
else
{
value = tracker.GetHandlerCallback(0);
}
return(true);
}
value = null;
return(false);
}
public @ref(CodeContext context, object @object, object callback)
{
_context = context;
WeakRefTracker wrt = WeakRefHelpers.InitializeWeakRef(_context.GetPythonContext(), this, @object, callback);
_target = new WeakHandle(@object, false);
_targetId = wrt.TargetId;
}
internal override bool TrySetValue(CodeContext context, object instance, PythonType owner, object value)
{
IWeakReferenceable reference;
if (context.GetPythonContext().TryConvertToWeakReferenceable(instance, out reference))
{
return(reference.SetWeakRef(new WeakRefTracker(value, instance)));
}
return(false);
}
public static void unregister(CodeContext context, object func)
{
var functions = context.GetPythonContext().GetModuleState(_registry_key) as List <FunctionDescriptor>;
if (functions != null)
{
lock (functions) {
functions.RemoveAll(x => PythonOps.Compare(context, x.Func, func) == 0);
}
}
}
public static void _clear(CodeContext context)
{
var functions = context.GetPythonContext().GetModuleState(_registry_key) as List <FunctionDescriptor>;
if (functions != null)
{
lock (functions) {
functions.Clear();
}
}
}
public static int _ncallbacks(CodeContext context)
{
int result = 0;
var functions = context.GetPythonContext().GetModuleState(_registry_key) as List <FunctionDescriptor>;
if (functions != null)
{
lock (functions) {
result = functions.Count;
}
}
return(result);
}
private static void AddFinalizer(CodeContext /*!*/ context, PythonType dt, object newObject)
{
// check if object has finalizer...
PythonTypeSlot dummy;
if (dt.TryResolveSlot(context, "__del__", out dummy))
{
IWeakReferenceable iwr = context.GetPythonContext().ConvertToWeakReferenceable(newObject);
Debug.Assert(iwr != null);
InstanceFinalizer nif = new InstanceFinalizer(context, newObject);
iwr.SetFinalizer(new WeakRefTracker(iwr, nif, nif));
}
}
public static object register(CodeContext context, object func, [ParamDictionary] IDictionary <object, object> kwargs, params object[] args)
{
if (!PythonOps.IsCallable(context, func))
{
throw PythonOps.TypeError("the first argument must be callable");
}
var functions = context.GetPythonContext().GetModuleState(_registry_key) as List <FunctionDescriptor>;
if (functions != null)
{
lock (functions) {
functions.Add(new FunctionDescriptor(func, kwargs, args));
}
}
return(func);
}
public static void _run_exitfuncs(CodeContext context)
{
var pc = context.GetPythonContext();
var functions = pc.GetModuleState(_registry_key) as List <FunctionDescriptor>;
if (functions != null)
{
Exception lastException = null;
lock (functions) {
for (int i = functions.Count - 1; i >= 0; i--)
{
var func = functions[i];
try {
if (func.KeywordArgs.Count > 0)
{
pc.CallWithKeywordsAndContext(context, func.Func, func.Args, func.KeywordArgs);
}
else
{
pc.CallWithContext(context, func.Func, func.Args);
}
} catch (SystemExitException ex) {
lastException = ex;
} catch (Exception ex) {
lastException = ex;
PythonOps.PrintWithDest(context, pc.SystemStandardError, "Error in atexit._run_exitfuncs:\n");
PythonOps.PrintException(context, ex);
}
}
}
if (lastException != null)
{
throw lastException;
}
}
}
private static void AddFinalizer(CodeContext/*!*/ context, PythonType dt, object newObject) {
// check if object has finalizer...
PythonTypeSlot dummy;
if (dt.TryResolveSlot(context, "__del__", out dummy)) {
IWeakReferenceable iwr = context.GetPythonContext().ConvertToWeakReferenceable(newObject);
Debug.Assert(iwr != null);
InstanceFinalizer nif = new InstanceFinalizer(context, newObject);
iwr.SetFinalizer(new WeakRefTracker(nif, nif));
}
}
