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/*
* This source file is part of libRocket, the HTML/CSS Interface Middleware
*
* For the latest information, see http://www.librocket.com
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "precompiled.h"
#include "../../../Include/Rocket/Core/Python/Utilities.h"
namespace Rocket {
namespace Core {
namespace Python {
bool Utilities::IsCallable(PyObject* self, const char* method_name)
{
PyObject* object = NULL;
// If its a dictionary, access it like a dictionary
if (PyDict_Check(self))
{
object = PyDict_GetItemString(self, (char*)method_name);
// This is a borrowed ref, Incref so the decref below is cancelled out
Py_XINCREF( object );
}
// otherwise attempt normal object access
else
{
object = PyObject_GetAttrString(self, (char*)method_name);
}
// If we couldn't find it, clear error and return false
if (!object)
{
PyErr_Clear();
return false;
}
int callable = PyCallable_Check(object);
Py_DECREF(object);
return callable == 1;
}
bool Utilities::Call(PyObject* object, const char* method_name, const python::tuple& args)
{
PyObject* result = PythonCall(object, method_name, args);
if (result)
Py_DECREF(result);
return result != NULL;
}
// Print the pending python error to stderr, optionally clearing it
void Utilities::PrintError(bool clear_error)
{
// Print the error and restore it to the caller
PyObject *type, *value, *traceback;
PyErr_Fetch(&type, &value, &traceback);
Py_XINCREF(type);
Py_XINCREF(value);
Py_XINCREF(traceback);
PyErr_Restore(type, value, traceback);
PyErr_Print();
if (clear_error)
{
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(traceback);
}
else
{
PyErr_Restore(type, value, traceback);
}
}
// Converts a python object into an Rocket variant.
bool Utilities::ConvertToVariant(Variant& variant, PyObject* object)
{
if (PyFloat_Check(object))
{
variant.Set((float) PyFloat_AsDouble(object));
return true;
}
else if (PyLong_Check(object))
{
variant.Set((int) PyLong_AsLong(object));
return true;
}
else if (PyUnicode_Check(object))
{
variant.Set(String(PyUnicode_AsUTF8(object)));
return true;
}
return false;
}
// Internal Python call method
PyObject* Utilities::PythonCall(PyObject* object, const char* method_name, const python::tuple& args )
{
ROCKET_ASSERT(IsCallable(object, method_name));
PyObject* result = NULL;
PyObject* method = NULL;
if (PyDict_Check(object))
{
method = PyDict_GetItemString(object, (char*)method_name);
// Borrowed reference, so increase so dec at bottom matches
Py_XINCREF(method);
}
else
{
method = PyObject_GetAttrString(object, (char*)method_name);
}
if (!method)
return NULL;
result = PyObject_CallObject(method, args.ptr());
Py_DECREF(method);
if (!result)
{
PrintError();
return NULL;
}
return result;
}
}
}
}
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