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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the utils of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef NFA_H
#define NFA_H
#include <QMap>
#include <QHash>
#include <QString>
#include <QVector>
#include <QDebug>
#include <QStack>
#include <QByteArray>
#include "global.h"
typedef QHash<InputType, int> TransitionMap;
struct State
{
QString symbol;
TransitionMap transitions;
};
inline QDataStream &operator<<(QDataStream &stream, const State &state)
{
return stream << state.symbol << state.transitions;
}
inline QDataStream &operator>>(QDataStream &stream, State &state)
{
return stream >> state.symbol >> state.transitions;
}
struct DFA : public QVector<State>
{
void debug() const;
DFA minimize() const;
};
class NFA
{
public:
static NFA createSingleInputNFA(InputType input);
static NFA createSymbolNFA(const QString &symbol);
static NFA createAlternatingNFA(const NFA &a, const NFA &b);
static NFA createConcatenatingNFA(const NFA &a, const NFA &b);
static NFA createOptionalNFA(const NFA &a);
// convenience
static NFA createStringNFA(const QByteArray &str);
static NFA createSetNFA(const QSet<InputType> &set);
static NFA createZeroOrOneNFA(const NFA &a);
static NFA applyQuantity(const NFA &a, int minOccurrences, int maxOccurrences);
void setTerminationSymbol(const QString &symbol);
DFA toDFA() const;
inline bool isEmpty() const { return states.isEmpty(); }
inline int stateCount() const { return states.count(); }
void debug();
private:
void initialize(int size);
void addTransition(int from, InputType input, int to);
void copyFrom(const NFA &other, int baseState);
void initializeFromPair(const NFA &a, const NFA &b,
int *initialA, int *finalA,
int *initialB, int *finalB);
QSet<int> epsilonClosure(const QSet<int> &initialClosure) const;
inline void assertValidState(int state)
{ Q_UNUSED(state); Q_ASSERT(state >= 0); Q_ASSERT(state < states.count()); }
#if defined(AUTOTEST)
public:
#endif
int initialState;
int finalState;
QVector<State> states;
};
#endif // NFA_H
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