/*
 * This file is part of the DOM implementation for KDE.
 *
 * (C) 1999 Lars Knoll (knoll@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 as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * $Id: dom_string.h,v 1.17 2001/02/18 19:12:10 mueller Exp $
 */
#ifndef _DOM_DOMString_h_
#define _DOM_DOMString_h_

#include <qstring.h>

namespace DOM {

class DOMStringImpl;

/**
 * This class implements the basic string we use in the DOM. We do not use
 * QString for 2 reasons: Memory overhead, and the missing explicit sharing
 * of strings we need for the DOM.
 *
 * All DOMStrings are explicitly shared (they behave like pointers), meaning
 * that modifications to one instance will also modify all others. If you
 * wish to get a DOMString that is independent, use @ref copy().
 */
class DOMString
{
    friend class CharacterDataImpl;

public:
    /** default constructor. Gives an empty DOMString */
    DOMString();
    /* constructs an empty DOMString. Like this assignment to 0 works */
    DOMString(int);

    DOMString(const QChar *str, uint len);
    DOMString(const QString &);
    DOMString(const char *str);
    DOMString(DOMStringImpl *i);
    virtual ~DOMString();

    // assign and copy
    DOMString(const DOMString &str);
    DOMString &operator =(const DOMString &str);

    /**
     * append str to this string
     */
    DOMString &operator += (const DOMString &str);
    /**
     * add two DOMString's
     */
    DOMString operator + (const DOMString &str);

    void insert(DOMString str, uint pos);

    /**
     * The character at position i of the DOMString. If i > length(), the
     * character returned will be 0.
     */
    const QChar &operator [](unsigned int i) const;

    int find(const QChar c, int start = 0) const;

    uint length() const;
    void truncate( unsigned int len );
    void remove(unsigned int pos, int len=1);
    /**
     * Splits the string into two. The original string gets truncated to pos, and the rest is returned.
     */
    DOMString split(unsigned int pos);

    QChar *unicode() const;
    QString string() const;

    int toInt() const;
    bool percentage(int &_percentage) const;

    DOMString copy() const;

    bool isNull()  const { return (impl == 0); }
    bool isEmpty()  const;

    /**
     * @internal get a handle to the imlementation of the DOMString
     * Use at own risk!!!
     */
    DOMStringImpl *implementation() const { return impl; }

    /**
     * @internal get a pointer to start of the string
     * Needed by kBackpage
     */
    const QChar *stringPtr() const;

protected:
    DOMStringImpl *impl;
};

bool operator==( const DOMString &a, const DOMString &b );
bool operator==( const DOMString &a, const QString &b );
bool operator==( const DOMString &a, const char *b );
bool operator==( const DOMString &a, int );
bool operator!=( const DOMString &a, const DOMString &b );
bool operator!=( const DOMString &a, const QString &b );
bool operator!=( const DOMString &a, const char *b );
bool operator!=( const DOMString &a, int );

bool strncmp( const DOMString &a, const DOMString &b, unsigned int len );
int strcmp( const DOMString &a, const DOMString &b );

int strncasecmp( const DOMString &a, const DOMString &b, unsigned int l );
int strcasecmp( const DOMString &a, const DOMString &b );

};
#endif
