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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 ROCKETCOREPYTHONNAMEINDEXINTERFACE_H
#define ROCKETCOREPYTHONNAMEINDEXINTERFACE_H
#include "Utilities.h"
namespace Rocket {
namespace Core {
namespace Python {
template < typename HostType >
class NameAccessorInvalid
{
public:
python::object operator()(HostType& host, const char* name)
{
PyErr_SetString(PyExc_KeyError, "Invalid key.");
python::throw_error_already_set();
return python::object();
}
};
/**
Template class for generating a lightweight proxy object for providing array-style lookups on a C++ object.
@author Peter Curry
*/
template < typename HostType, typename LengthAccessor, typename IndexAccessor, typename NameAccessor = NameAccessorInvalid< HostType > >
class NameIndexInterface : public python::def_visitor< NameIndexInterface< HostType, LengthAccessor, IndexAccessor, NameAccessor > >
{
public:
NameIndexInterface()
{
}
~NameIndexInterface()
{
}
/// Initialise the interface.
template < typename ClassType >
void visit(ClassType& _class) const
{
_class.def("__getitem__", &NameIndexInterface< HostType, LengthAccessor, IndexAccessor, NameAccessor >::GetItem);
_class.def("__len__", &NameIndexInterface< HostType, LengthAccessor, IndexAccessor, NameAccessor >::Len);
}
/// Python __getitem__ override.
static python::object GetItem(HostType& host, python::object key)
{
static NameAccessor name_accessor;
static LengthAccessor length_accessor;
static IndexAccessor index_accessor;
if (PyUnicode_Check(key.ptr()))
{
return Rocket::Core::Python::Utilities::MakeObject(name_accessor(host, PyUnicode_AsUTF8(key.ptr())));
}
else if (PyLong_Check(key.ptr()))
{
int index = PyLong_AsLong(key.ptr());
// Support indexing from both ends.
if (index < 0)
index = length_accessor(host) + index;
// Throw exception if we're out of range, this is required to support python iteration.
if (index >= length_accessor(host))
{
PyErr_SetString(PyExc_IndexError, "Index out of range.");
python::throw_error_already_set();
}
return Rocket::Core::Python::Utilities::MakeObject(index_accessor(host, index));
}
PyErr_SetString(PyExc_KeyError, "Invalid key.");
python::throw_error_already_set();
return python::object();
}
/// Python __len__ override.
static int Len(HostType& host)
{
static LengthAccessor length_accessor;
return length_accessor(host);
}
};
}
}
}
#endif
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