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/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 2003 Apple Computer, Inc
 *
 *  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., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#ifndef KJS_IDENTIFIER_H
#define KJS_IDENTIFIER_H

#include "ustring.h"

#include <wtf/HashFunctions.h>
#include <wtf/HashTraits.h>

namespace KJS
{

/**
 * Represents an Identifier for a Javascript object.
 */
class KJS_EXPORT Identifier
{
    friend class PropertyMap;
public:
    /**
    * Creates an empty identifier
    */
    Identifier() { }
    /**
    * Creates an identifier with the name of the string
    * @code
    * KJS::Identifier method("someJSMethod");
    * @endcode
    */
    Identifier(const char *s) : _ustring(add(s)) { }
    Identifier(const UChar *s, int length) : _ustring(add(s, length)) { }
    explicit Identifier(UString::Rep *rep) : _ustring(add(rep)) { }
    explicit Identifier(const UString &s) : _ustring(add(s.rep())) { }

    /**
    * returns a UString of the identifier
    */
    const UString &ustring() const
    {
        return _ustring;
    }
    KJS_EXTERNAL_EXPORT DOM::DOMString domString() const;
    /**
    * returns a QString of the identifier
    */
    KJS_EXTERNAL_EXPORT QString qstring() const;

    /**
    * returns a UChar pointer to the string of the identifier with a size defined by size().
    */
    const UChar *data() const
    {
        return _ustring.data();
    }
    /**
    * The size of the UChar string returned.
    */
    int size() const
    {
        return _ustring.size();
    }

    /**
    * Char * of the identifier's string.
    */
    const char *ascii() const
    {
        return _ustring.ascii();
    }

    static Identifier from(unsigned y)
    {
        return Identifier(UString::from(y));
    }

    /**
    * Returns the identfiers state of being unset.
    */
    bool isNull() const
    {
        return _ustring.isNull();
    }
    /**
    * Returns that the identifiers string is set, but is empty.
    */
    bool isEmpty() const
    {
        return _ustring.isEmpty();
    }

    uint32_t toStrictUInt32(bool *ok) const
    {
        return _ustring.toStrictUInt32(ok);
    }
    unsigned toArrayIndex(bool *ok) const
    {
        return _ustring.toArrayIndex(ok);
    }
    double toDouble() const
    {
        return _ustring.toDouble();
    }

    friend bool operator==(const Identifier &, const Identifier &);
    friend bool operator!=(const Identifier &, const Identifier &);

    friend bool operator==(const Identifier &, const char *);

    static void remove(UString::Rep *);
    static bool equal(const UString::Rep *, const char *);
    static bool equal(const UString::Rep *, const UChar *, int length);

private:
    UString _ustring;

    static bool equal(const Identifier &a, const Identifier &b)
    {
        return a._ustring.rep() == b._ustring.rep();
    }
    static bool equal(const Identifier &a, const char *b)
    {
        return equal(a._ustring.rep(), b);
    }

    static PassRefPtr<UString::Rep> add(const char *);
    static PassRefPtr<UString::Rep> add(const UChar *, int length);
    static PassRefPtr<UString::Rep> add(UString::Rep *r)
    {
        if (r->isIdentifier) {
            return r;
        }
        return addSlowCase(r);
    }
    static PassRefPtr<UString::Rep> addSlowCase(UString::Rep *r);
};

inline bool operator==(const Identifier &a, const Identifier &b)
{
    return Identifier::equal(a, b);
}

inline bool operator!=(const Identifier &a, const Identifier &b)
{
    return !Identifier::equal(a, b);
}

inline bool operator==(const Identifier &a, const char *b)
{
    return Identifier::equal(a, b);
}

} // namespace KJS

#endif // KJS_IDENTIFIER_H