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/*****************************************************************************
*
* This file is part of the Utopia Documents application.
* Copyright (c) 2008-2014 Lost Island Labs
* <info@utopiadocs.com>
*
* Utopia Documents is free software: you can redistribute it and/or modify
* it under the terms of the GNU GENERAL PUBLIC LICENSE VERSION 3 as
* published by the Free Software Foundation.
*
* Utopia Documents is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the OpenSSL
* library under certain conditions as described in each individual source
* file, and distribute linked combinations including the two.
*
* You must obey the GNU General Public License in all respects for all of
* the code used other than OpenSSL. If you modify file(s) with this
* exception, you may extend this exception to your version of the file(s),
* but you are not obligated to do so. If you do not wish to do so, delete
* this exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with Utopia Documents. If not, see <http://www.gnu.org/licenses/>
*
*****************************************************************************/
#include <Python.h>
#include <string>
#include <iostream>
class PyExtension
{
public:
PyExtension(const std::string & extensionMetaType, const std::string & extensionTypeName)
: _extensionMetaType(extensionMetaType), _extensionTypeName(extensionTypeName), _extensionObject(0), _extensionNamespace(0)
{
// Acquire Python's global interpreter lock
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
// Load the specified meta type's class and instantiate an object
_extensionNamespace = PyModule_GetDict(PyImport_AddModule(extensionTypeName.substr(0, extensionTypeName.rfind('.')).c_str()));
_extensionObject = PyRun_String((extensionMetaType + ".typeOf('" + extensionTypeName + "')()").c_str(), Py_eval_input, _extensionNamespace, _extensionNamespace);
if (_extensionObject == 0) {
PyErr_PrintEx(0);
} else {
// Get class' doc string
PyObject * doc = PyObject_GetAttrString(_extensionObject, "__doc__");
_extensionDocString = doc != Py_None ? PyString_AsString(doc) : "UNTITLED";
Py_XDECREF(doc);
}
// Release Python's global interpreter lock
PyGILState_Release(gstate);
}
~PyExtension()
{
if (_extensionObject) {
// Acquire Python's global interpreter lock
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
// Release object for GC
Py_DECREF(_extensionObject);
// Release Python's global interpreter lock
PyGILState_Release(gstate);
}
}
protected:
std::string extensionMetaType() const { return _extensionMetaType; }
std::string extensionTypeName() const { return _extensionTypeName; }
std::string extensionDocString() const { return _extensionDocString; }
PyObject * extensionObject() const { return _extensionObject; }
PyObject * extensionNamespace() const { return _extensionNamespace; }
private:
std::string _extensionMetaType;
std::string _extensionTypeName;
std::string _extensionDocString;
PyObject * _extensionObject;
PyObject * _extensionNamespace;
};
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