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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** 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
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "config.h" // compile on Windows
#include "qscriptstring.h"
#include "qscriptstring_p.h"
#include "qscriptengine.h"
#include "qscriptengine_p.h"
QT_BEGIN_NAMESPACE
/*!
\since 4.4
\class QScriptString
\brief The QScriptString class acts as a handle to "interned" strings in a QScriptEngine.
\ingroup script
QScriptString can be used to achieve faster (repeated)
property getting/setting, and comparison of property names, of
script objects.
To get a QScriptString representation of a string, pass the string
to QScriptEngine::toStringHandle(). The typical usage pattern is to
register one or more pre-defined strings when setting up your script
environment, then subsequently use the relevant QScriptString as
argument to e.g. QScriptValue::property().
Call the toString() function to obtain the string that a
QScriptString represents.
Call the toArrayIndex() function to convert a QScriptString to an
array index. This is useful when using QScriptClass to implement
array-like objects.
*/
/*!
Constructs an invalid QScriptString.
*/
QScriptString::QScriptString()
: d_ptr(0)
{
}
/*!
Constructs a new QScriptString that is a copy of \a other.
*/
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());
}
}
/*!
Destroys this QScriptString.
*/
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;
}
}
}
/*!
Assigns the \a other value to this QScriptString.
*/
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;
}
/*!
Returns true if this QScriptString is valid; otherwise
returns false.
*/
bool QScriptString::isValid() const
{
return QScriptStringPrivate::isValid(*this);
}
/*!
Returns true if this QScriptString is equal to \a other;
otherwise returns false.
*/
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;
}
/*!
Returns true if this QScriptString is not equal to \a other;
otherwise returns false.
*/
bool QScriptString::operator!=(const QScriptString &other) const
{
return !operator==(other);
}
/*!
\since 4.6
Attempts to convert this QScriptString to a QtScript array index,
and returns the result.
If a conversion error occurs, *\a{ok} is set to false; otherwise
*\a{ok} is set to true.
*/
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;
}
/*!
Returns the string that this QScriptString represents, or a
null string if this QScriptString is not valid.
\sa isValid()
*/
QString QScriptString::toString() const
{
Q_D(const QScriptString);
if (!d || !d->engine)
return QString();
return d->identifier.ustring();
}
/*!
Returns the string that this QScriptString represents, or a
null string if this QScriptString is not valid.
\sa toString()
*/
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
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