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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.
*
*/
#ifndef ROCKETCOREPYTHONELEMENTINSTANCER_H
#define ROCKETCOREPYTHONELEMENTINSTANCER_H
#include "../String.h"
#include "../XMLParser.h"
#include "Python.h"
#include "../Element.h"
#include "../ElementInstancer.h"
#include "../Header.h"
namespace Rocket {
namespace Core {
namespace Python {
/**
Python Element Instancer
This object provides the standard ElementInstancer
interface for instancing python elements.
NOTE: This is all inline so that it can be used by 3rdparty plugins
@author Lloyd Weehuizen
*/
class ElementInstancer : public Rocket::Core::ElementInstancer
{
public:
ElementInstancer(PyObject* _class_definition)
{
class_definition = _class_definition;
Py_INCREF(class_definition);
}
virtual ~ElementInstancer()
{
Py_DECREF(class_definition);
}
/// Instances an element given the tag name and attributes
/// @param tag Name of the element to instance
/// @param attributes vector of name value pairs
virtual Element* InstanceElement(Element* ROCKET_UNUSED_PARAMETER(parent), const Rocket::Core::String& tag, const Rocket::Core::XMLAttributes& ROCKET_UNUSED_PARAMETER(attributes))
{
ROCKET_UNUSED(parent);
ROCKET_UNUSED(attributes);
// Build the arguments
PyObject* args = PyTuple_New(1);
PyTuple_SetItem(args, 0, PyUnicode_FromString(tag.CString()));
PyObject* instance = PyObject_CallObject(class_definition, args);
Py_DECREF(args);
// Check the instance was created successfully
if (instance == NULL)
{
PyErr_Print();
return NULL;
}
Element* element = python::extract<Element*>(python::object(python::handle<>(python::borrowed(instance))));
// Need to switch the Python reference count to a true C++ reference count.
element->AddReference(); // Adds to C++ and Python reference counts.
Py_DECREF( instance ); // Removes from Python.
return element;
}
/// Releases the given element
/// @param element to release
virtual void ReleaseElement(Element* ROCKET_UNUSED_PARAMETER(element))
{
ROCKET_UNUSED(element);
// Never release Python elements, Python will manage this for us.
}
/// Release the instancer
virtual void Release()
{
delete this;
}
private:
PyObject* class_definition;
};
}
}
}
#endif
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