/*
 *  Copyright (c) 2002-2003 Jesper K. Pedersen <blackie@kde.org>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License version 2 as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 **/
#ifndef REGEXP_H
#define REGEXP_H

#include <tqdom.h>
#include <tqptrlist.h>

class CompoundRegExp;
class ErrorMap;

/**
   Abstract syntax tree for regular expressions.
   @internal
*/
class RegExp
{
public:
    RegExp( bool selected );
	virtual ~RegExp();

    virtual int precedence() const = 0;
    virtual TQDomNode toXml( TQDomDocument* doc ) const = 0;
    virtual bool load( TQDomElement, const TQString& version ) = 0;
    TQString toXmlString() const;

    void check( ErrorMap& );
    virtual bool check( ErrorMap&, bool first, bool last ) = 0;

    void addChild( RegExp* child );
    void removeChild( RegExp* child );
    void setParent( RegExp* parent );
    RegExp* clone() const;
    virtual bool operator==( const RegExp& other ) const { return ( type() == other.type() ); }

    enum RegExpType { CONC, TEXT, DOT, POSITION, REPEAT, ALTN, COMPOUND, LOOKAHEAD, TEXTRANGE };
    virtual RegExpType type() const = 0;
    virtual void replacePart( CompoundRegExp* /* replacement */ ) {}
    bool isSelected() const { return _selected; }
    void setSelected( bool b ) { _selected = b; }

protected:
    RegExp* readRegExp( TQDomElement top, const TQString& version );

private:
    RegExp() {} // disable
    TQPtrList<RegExp> _children;
    RegExp* _parent;
    bool _destructing;
    bool _selected;
};

typedef TQPtrList<RegExp> RegExpList;
typedef TQPtrListIterator<RegExp> RegExpListIt;

#endif // REGEXP_H