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/****************************************************************************
**
** Copyright (C) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Script Generator project on Qt Labs.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef PP_ENVIRONMENT_H
#define PP_ENVIRONMENT_H
#include <vector>
#include <cstring>
namespace rpp {
class pp_environment
{
public:
typedef std::vector<pp_macro*>::const_iterator const_iterator;
public:
pp_environment ():
current_line (0),
_M_hash_size (4093)
{
_M_base = (pp_macro **) memset (new pp_macro* [_M_hash_size], 0, _M_hash_size * sizeof (pp_macro*));
}
~pp_environment ()
{
for (std::size_t i = 0; i < _M_macros.size (); ++i)
delete _M_macros [i];
delete [] _M_base;
}
const_iterator first_macro () const { return _M_macros.begin (); }
const_iterator last_macro () const { return _M_macros.end (); }
inline void bind (pp_fast_string const *__name, pp_macro const &__macro)
{
std::size_t h = hash_code (*__name) % _M_hash_size;
pp_macro *m = new pp_macro (__macro);
m->name = __name;
m->next = _M_base [h];
m->hash_code = h;
_M_base [h] = m;
_M_macros.push_back (m);
if (_M_macros.size() == _M_hash_size)
rehash();
}
inline void unbind (pp_fast_string const *__name)
{
if (pp_macro *m = resolve (__name))
m->hidden = true;
}
inline void unbind (char const *__s, std::size_t __size)
{
pp_fast_string __tmp (__s, __size);
unbind (&__tmp);
}
inline pp_macro *resolve (pp_fast_string const *__name) const
{
std::size_t h = hash_code (*__name) % _M_hash_size;
pp_macro *it = _M_base [h];
while (it && it->name && it->hash_code == h && (*it->name != *__name || it->hidden))
it = it->next;
return it;
}
inline pp_macro *resolve (char const *__data, std::size_t __size) const
{
pp_fast_string const __tmp (__data, __size);
return resolve (&__tmp);
}
std::string current_file;
int current_line;
private:
inline std::size_t hash_code (pp_fast_string const &s) const
{
std::size_t hash_value = 0;
for (std::size_t i = 0; i < s.size (); ++i)
hash_value = (hash_value << 5) - hash_value + s.at (i);
return hash_value;
}
void rehash()
{
delete[] _M_base;
_M_hash_size <<= 1;
_M_base = (pp_macro **) memset (new pp_macro* [_M_hash_size], 0, _M_hash_size * sizeof(pp_macro*));
for (std::size_t index = 0; index < _M_macros.size (); ++index)
{
pp_macro *elt = _M_macros [index];
std::size_t h = hash_code (*elt->name) % _M_hash_size;
elt->next = _M_base [h];
elt->hash_code = h;
_M_base [h] = elt;
}
}
private:
std::vector<pp_macro*> _M_macros;
pp_macro **_M_base;
std::size_t _M_hash_size;
};
} // namespace rpp
#endif // PP_ENVIRONMENT_H
// kate: space-indent on; indent-width 2; replace-tabs on;
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