/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the utils of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef NFA_H+
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#define NFA_H+
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+
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#include <QMap>+
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#include <QHash>+
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#include <QString>+
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#include <QVector>+
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#include <QDebug>+
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#include <QStack>+
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#include <QByteArray>+
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+
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#include "global.h"+
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+
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typedef QHash<InputType, int> TransitionMap;+
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+
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struct State+
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{+
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    QString symbol;+
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    TransitionMap transitions;+
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};+
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+
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inline QDataStream &operator<<(QDataStream &stream, const State &state)+
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{+
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    return stream << state.symbol << state.transitions;+
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}+
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+
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inline QDataStream &operator>>(QDataStream &stream, State &state)+
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{+
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    return stream >> state.symbol >> state.transitions;+
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}+
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+
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struct DFA : public QVector<State>+
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{+
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    void debug() const;+
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    DFA minimize() const;+
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};+
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+
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class NFA+
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{+
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public:+
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    static NFA createSingleInputNFA(InputType input);+
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    static NFA createSymbolNFA(const QString &symbol);+
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    static NFA createAlternatingNFA(const NFA &a, const NFA &b);+
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    static NFA createConcatenatingNFA(const NFA &a, const NFA &b);+
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    static NFA createOptionalNFA(const NFA &a);+
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+
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    // convenience+
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    static NFA createStringNFA(const QByteArray &str);+
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    static NFA createSetNFA(const QSet<InputType> &set);+
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    static NFA createZeroOrOneNFA(const NFA &a);+
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    static NFA applyQuantity(const NFA &a, int minOccurrences, int maxOccurrences);+
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+
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    void setTerminationSymbol(const QString &symbol);+
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    +
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    DFA toDFA() const;+
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+
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    inline bool isEmpty() const { return states.isEmpty(); }+
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    inline int stateCount() const { return states.count(); }+
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+
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    void debug();+
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+
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private:+
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    void initialize(int size);+
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    void addTransition(int from, InputType input, int to);+
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    void copyFrom(const NFA &other, int baseState);+
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+
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    void initializeFromPair(const NFA &a, const NFA &b,+
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                            int *initialA, int *finalA,+
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                            int *initialB, int *finalB);+
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+
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    QSet<int> epsilonClosure(const QSet<int> &initialClosure) const;+
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+
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    inline void assertValidState(int state)+
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    { Q_UNUSED(state); Q_ASSERT(state >= 0); Q_ASSERT(state < states.count()); }+
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    +
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#if defined(AUTOTEST)+
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public:+
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#endif+
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    int initialState;+
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    int finalState;+
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+
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    QVector<State> states;+
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};+
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+
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#endif // NFA_H+
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+
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