qscriptstring.cpp

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtScript module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL-ONLY$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you have questions regarding the use of this file, please contact
** us via http://www.qt-project.org/.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "config.h" // compile on Windows
#include "qscriptstring.h"
#include "qscriptstring_p.h"
#include "qscriptengine.h"
#include "qscriptengine_p.h"

QT_BEGIN_NAMESPACE

QScriptString::QScriptString()
    : d_ptr(0)
{
}

QScriptString::QScriptString(const QScriptString &other)
    : d_ptr(other.d_ptr)
{
    if (d_func() && (d_func()->type == QScriptStringPrivate::StackAllocated)) {
        Q_ASSERT(d_func()->ref != 1);
        d_ptr.detach();
        d_func()->ref = 1;
        d_func()->type = QScriptStringPrivate::HeapAllocated;
        d_func()->engine->registerScriptString(d_func());
    }
}

QScriptString::~QScriptString()
{
    Q_D(QScriptString);
    if (d) {
        switch (d->type) {
        case QScriptStringPrivate::StackAllocated:
            Q_ASSERT(d->ref == 1);
            d->ref.ref(); // avoid deletion
            break;
        case QScriptStringPrivate::HeapAllocated:
            if (d->engine && (d->ref == 1)) {
                // Make sure the identifier is removed from the correct engine.
                QScript::APIShim shim(d->engine);
                d->identifier = JSC::Identifier();
                d->engine->unregisterScriptString(d);
            }
            break;
        }
    }
}

QScriptString &QScriptString::operator=(const QScriptString &other)
{
    if (d_func() && d_func()->engine && (d_func()->ref == 1) && (d_func()->type == QScriptStringPrivate::HeapAllocated)) {
        // current d_ptr will be deleted at the assignment below, so unregister it first
        d_func()->engine->unregisterScriptString(d_func());
    }
    d_ptr = other.d_ptr;
    if (d_func() && (d_func()->type == QScriptStringPrivate::StackAllocated)) {
        Q_ASSERT(d_func()->ref != 1);
        d_ptr.detach();
        d_func()->ref = 1;
        d_func()->type = QScriptStringPrivate::HeapAllocated;
        d_func()->engine->registerScriptString(d_func());
    }
    return *this;
}

bool QScriptString::isValid() const
{
    return QScriptStringPrivate::isValid(*this);
}

bool QScriptString::operator==(const QScriptString &other) const
{
    Q_D(const QScriptString);
    if (!d || !other.d_func())
        return d == other.d_func();
    return d->identifier == other.d_func()->identifier;
}

bool QScriptString::operator!=(const QScriptString &other) const
{
    return !operator==(other);
}

quint32 QScriptString::toArrayIndex(bool *ok) const
{
    Q_D(const QScriptString);
    if (!d) {
        if (ok)
            *ok = false;
        return -1;
    }
    bool tmp;
    bool *okok = ok ? ok : &tmp;
    quint32 result = d->identifier.toArrayIndex(okok);
    if (!*okok)
        result = -1;
    return result;
}

QString QScriptString::toString() const
{
    Q_D(const QScriptString);
    if (!d || !d->engine)
        return QString();
    return d->identifier.ustring();
}

QScriptString::operator QString() const
{
    return toString();
}

uint qHash(const QScriptString &key)
{
    QScriptStringPrivate *d = QScriptStringPrivate::get(key);
    if (!d)
        return 0;
    return qHash(d->identifier.ustring().rep());
}

QT_END_NAMESPACE