util/lexgen/re2nfa.h
author Eckhart Koeppen <eckhart.koppen@nokia.com>
Thu, 29 Apr 2010 15:15:16 +0300
branchRCL_3
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2010-17 9996a03743ab23f83c83c5bc7ade0f82f71b1506
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/****************************************************************************
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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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#ifndef RE2NFA_H
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#define RE2NFA_H
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#include "nfa.h"
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#include <QSet>
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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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    NFA parse(const QString &expression, int *errorColumn = 0);
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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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    NFA createCharNFA();
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private:
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    friend class RegExpTokenizer;
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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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    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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    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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    void tokenize(const QString &input);
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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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#endif // RE2NFA_H
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