analitza/analitza/abstractlexer.h

0001 /*************************************************************************************
0002  *  Copyright (C) 2008 by Aleix Pol <aleixpol@kde.org>                               *
0003  *                                                                                   *
0004  *  This program is free software; you can redistribute it and/or                    *
0005  *  modify it under the terms of the GNU General Public License                      *
0006  *  as published by the Free Software Foundation; either version 2                   *
0007  *  of the License, or (at your option) any later version.                           *
0008  *                                                                                   *
0009  *  This program is distributed in the hope that it will be useful,                  *
0010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of                   *
0011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                    *
0012  *  GNU General Public License for more details.                                     *
0013  *                                                                                   *
0014  *  You should have received a copy of the GNU General Public License                *
0015  *  along with this program; if not, write to the Free Software                      *
0016  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA   *
0017  *************************************************************************************/
0018
0019 #ifndef ABSTRACTLEXER_H
0020 #define ABSTRACTLEXER_H
0021
0022 #include <QString>
0023 #include <QStringList>
0024 #include <QHash>
0025 #include <QQueue>
0026 #include "analitzaexport.h"
0027
0028 class ANALITZA_EXPORT AbstractLexer
0029 {
0030     public:
0031         struct TOKEN
0032         {
0033             TOKEN(int _type=-1, uint _pos=0, const QString& _val=QString(), unsigned char _len=0) :
0034                 type(_type), val(_val), len(_len), pos(_pos) {}
0035
0036             int type;
0037             QString val;
0038             unsigned char len;
0039             uint pos;
0040         };
0041
0042         explicit AbstractLexer(const QString &source);
0043         virtual ~AbstractLexer();
0044         int lex();
0045         int lineNumber() const { return m_lines; }
0046         bool isCompletelyRead() const { return m_openPr==0 && m_openCb==0; }
0047
0048         TOKEN current;
0049         QString error() const { return m_err; }
0050         bool isCompleteExpression(bool justempty=false);
0051
0052     protected:
0053         QString m_err;
0054         QString m_source;
0055
0056         int m_lines;
0057         int m_openPr, m_openCb;
0058         QQueue<TOKEN> m_tokens;
0059         static QHash<QChar, int> m_operators;
0060         static QHash<QString, int> m_longOperators;
0061         virtual void getToken()=0;
0062         void printQueue(const QQueue<TOKEN>& q) const;
0063 };
0064
0065 #endif