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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qjsprimitivevalue.h"
#include <QtQml/private/qv4runtime_p.h>
QT_BEGIN_NAMESPACE
/*!
\since 6.1
\class QJSPrimitiveUndefined
\brief An empty marker type to signify the JavaScript Undefined type and its single value.
*/
/*!
\since 6.1
\class QJSPrimitiveNull
\brief An empty marker type to signify the JavaScript null value.
*/
/*!
\since 6.1
\class QJSPrimitiveValue
\brief The QJSPrimitiveValue class operates on primitive types in JavaScript semantics.
\ingroup qtjavascript
\inmodule QtQml
QJSPrimitiveValue supports most of the primitive types defined in the
\l{ECMA-262} standard, in particular Undefined, Boolean, Number, and String.
Additionally, you can store a JavaScript null in a QJSPrimitiveValue and as a
special case of Number, you can store an integer value.
All those values are stored immediately, without interacting with the
JavaScript heap. Therefore, you can pass QJSPrimitiveValues between different
JavaScript engines. In contrast to QJSManagedValue, there is also no danger
in destroying a QJSPrimitiveValue from a different thread than it was created
in. On the flip side, QJSPrimitiveValue does not hold a reference to any
JavaScript engine.
QJSPrimitiveValue implements the JavaScript arithmetic and comparison
operators on the supported types in JavaScript semantics. Types are coerced
like the JavaScript engine would coerce them if the operators were written
in a JavaScript expression.
The JavaScript Symbol type is not supported as it is of very limited utility
regarding arithmetic and comparison operators, the main purpose of
QJSPrimitiveValue. In particular, it causes an exception whenever you try to
coerce it to a number or a string, and we cannot throw exceptions without a
JavaScript Engine.
*/
/*!
\enum QJSPrimitiveValue::Type
This enum speicifies the types a QJSPrimitiveValue might contain.
\value Undefined The JavaScript Undefined value.
\value Null The JavaScript null value. This is in fact not a separate
JavaScript type but a special value of the Object type. As it is
very common and storable without JavaScript engine, it is still
supported.
\value Boolean A JavaScript Boolean value.
\value Integer An integer. This is a special case of the JavaScript Number
type. JavaScript does not have an actual integer type, but
the \l{ECMA-262} standard contains rules on how to transform a
Number in order to prepare it for certain operators that only
make sense on integers, in particular the bit shift operators.
QJSPrimitiveValue's Integer type represents the result of such
a transformation.
\value Double A JavaScript Number value.
\value String A JavaScript String value.
*/
/*!
\fn Type QJSPrimitiveValue::type() const
Returns the type of the QJSPrimitiveValue.
*/
/*!
\fn QJSPrimitiveValue::QJSPrimitiveValue()
Creates a QJSPrimitiveValue of type Undefined.
*/
/*!
\fn QJSPrimitiveValue::QJSPrimitiveValue(QJSPrimitiveUndefined undefined)
Creates a QJSPrimitiveValue of value \a undefined and type Undefined.
*/
/*!
\fn QJSPrimitiveValue::QJSPrimitiveValue(QJSPrimitiveNull null)
Creates a QJSPrimitiveValue of value \a null and type Null.
*/
/*!
\fn QJSPrimitiveValue::QJSPrimitiveValue(bool value)
Creates a QJSPrimitiveValue of value \a value and type Boolean.
*/
/*!
\fn QJSPrimitiveValue::QJSPrimitiveValue(int value)
Creates a QJSPrimitiveValue of value \a value and type Integer.
*/
/*!
\fn QJSPrimitiveValue::QJSPrimitiveValue(double value)
Creates a QJSPrimitiveValue of value \a value and type Double.
*/
/*!
\fn QJSPrimitiveValue::QJSPrimitiveValue(QString value)
Creates a QJSPrimitiveValue of value \a value and type String.
*/
/*!
\fn bool QJSPrimitiveValue::toBoolean() const
Returns the value coerced a boolean by JavaScript rules.
*/
/*!
\fn int QJSPrimitiveValue::toInteger() const
Returns the value coerced to an integral 32bit number by the rules JavaScript
would apply when preparing it for a bit shift operation.
*/
/*!
\fn double QJSPrimitiveValue::toDouble() const
Returns the value coerced to a JavaScript Number by JavaScript rules.
*/
/*!
\fn QString QJSPrimitiveValue::toString() const
Returns the value coerced to a JavaScript String by JavaScript rules.
*/
/*!
\fn QJSPrimitiveValue operator+(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Perfoms the JavaScript '+' operation on \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn QJSPrimitiveValue operator-(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '-' operation on \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn QJSPrimitiveValue operator*(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '*' operation on \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn QJSPrimitiveValue operator/(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '/' operation between \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn bool QJSPrimitiveValue::strictlyEquals(const QJSPrimitiveValue &other) const
Performs the JavaScript '===' operation on this QJSPrimitiveValue and
\a other, and returns the result.
*/
/*!
\fn bool QJSPrimitiveValue::equals(const QJSPrimitiveValue &other) const
Performs the JavaScript '==' operation on this QJSPrimitiveValue and
\a other, and returns the result.
*/
/*!
\fn bool operator==(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '===' operation on \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn bool operator!=(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '!==' operation on \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn bool operator<(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '<' operation on \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn bool operator>(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '>' operation on \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn bool operator<=(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '<=' operation on \a lhs and \a rhs, and returns the
result.
*/
/*!
\fn bool operator>=(const QJSPrimitiveValue &lhs, const QJSPrimitiveValue &rhs)
\since 6.1
Performs the JavaScript '>=' operation on \a lhs and \a rhs, and returns the
result.
*/
QString QJSPrimitiveValue::toString(double d)
{
QString result;
QV4::RuntimeHelpers::numberToString(&result, d);
return result;
}
QT_END_NAMESPACE
|
