/****************************************************************************+
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**+
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** Copyright (C) 2009 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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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef RE2NFA_H+
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#define RE2NFA_H+
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+
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#include "nfa.h"+
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#include <QSet>+
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+
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class RE2NFA+
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{+
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public:+
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    RE2NFA(const QMap<QString, NFA> &macros, const QSet<InputType> &maxInputSet, Qt::CaseSensitivity cs);+
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+
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    NFA parse(const QString &expression, int *errorColumn = 0);+
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+
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private:+
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    NFA parseExpr();+
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    NFA parseBranch();+
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    NFA parsePiece();+
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    NFA parseAtom();+
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    NFA parseMaybeQuantifier(const NFA &nfa);+
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    NFA parseSet();+
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    NFA parseSet2();+
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+
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    NFA createCharNFA();+
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+
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private:+
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    friend class RegExpTokenizer;+
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+
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    enum Token {+
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        TOK_INVALID,+
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        TOK_STRING,+
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        TOK_LBRACE,   // {+
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        TOK_RBRACE,   // }+
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        TOK_LBRACKET, // [+
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        TOK_RBRACKET, // ]+
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        TOK_LPAREN,   // (+
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        TOK_RPAREN,   // )+
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        TOK_COMMA,+
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        TOK_STAR,+
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        TOK_OR,+
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        TOK_QUESTION,+
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        TOK_DOT,+
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        TOK_PLUS,+
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        TOK_SEQUENCE,+
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        TOK_QUOTED_STRING+
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    };+
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+
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    struct Symbol+
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    {+
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        inline Symbol() : token(TOK_INVALID), column(-1) {}+
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        inline Symbol(Token t, const QString &l = QString()) : token(t), lexem(l), column(-1) {}+
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        Token token;+
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        QString lexem;+
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        int column;+
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    };+
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+
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    inline bool hasNext() const { return index < symbols.count(); }+
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    inline Token next() { return symbols.at(index++).token; }+
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    bool next(Token t);+
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    bool test(Token t);+
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    inline void prev() { index--; }+
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    inline const Symbol &symbol() const { return symbols.at(index - 1); }+
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    QString lexemUntil(Token t);+
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+
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    void tokenize(const QString &input);+
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+
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    QMap<QString, NFA> macros;+
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    QVector<Symbol> symbols;+
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    int index;+
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    int errorColumn;+
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    const QSet<InputType> maxInputSet;+
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    Qt::CaseSensitivity caseSensitivity;+
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};+
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+
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#endif // RE2NFA_H+
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+
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