/// <summary>
/// Restore the __import__ hook.
/// </summary>
static void RestoreImport()
{
IntPtr builtins = Runtime.GetBuiltins();
int res = Runtime.PyObject_SetAttr(builtins, PyIdentifier.__import__, py_import);
PythonException.ThrowIfIsNotZero(res);
Runtime.XDecref(py_import);
py_import = IntPtr.Zero;
hook.Release();
hook = null;
Runtime.XDecref(builtins);
}
/// <summary>
/// Initialize just the __import__ hook itself.
/// </summary>
static void InitImport()
{
// We replace the built-in Python __import__ with our own: first
// look in CLR modules, then if we don't find any call the default
// Python __import__.
IntPtr builtins = Runtime.GetBuiltins();
py_import = Runtime.PyObject_GetAttr(builtins, PyIdentifier.__import__);
PythonException.ThrowIfIsNull(py_import);
hook = new MethodWrapper(typeof(ImportHook), "__import__", "TernaryFunc");
int res = Runtime.PyObject_SetAttr(builtins, PyIdentifier.__import__, hook.ptr);
PythonException.ThrowIfIsNotZero(res);
Runtime.XDecref(builtins);
}
/// <summary>
/// Restore the __import__ hook.
/// </summary>
static void RestoreImport()
{
IntPtr builtins = Runtime.GetBuiltins();
IntPtr existing = Runtime.PyObject_GetAttr(builtins, PyIdentifier.__import__);
Runtime.XDecref(existing);
if (existing != hook.ptr)
{
throw new NotSupportedException("Unable to restore original __import__.");
}
int res = Runtime.PyObject_SetAttr(builtins, PyIdentifier.__import__, py_import);
PythonException.ThrowIfIsNotZero(res);
Runtime.XDecref(py_import);
py_import = IntPtr.Zero;
hook.Release();
hook = null;
Runtime.XDecref(builtins);
}