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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_XPathHelper_H
#define Patternist_XPathHelper_H
#include <private/qcommonnamespaces_p.h>
#include <private/qitem_p.h>
#include <private/qpatternistlocale_p.h>
#include <private/qreportcontext_p.h>
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Contains helper and utility functions.
*
* The common denominator of its functions is that they do not fit in
* well elsewhere, such as in a particular class. It is preferred if XPathHelper
* goes away, and that functions are in more specific classes.
*
* @ingroup Patternist
* @author Frans Englich <frans.englich@nokia.com>
*/
class XPathHelper
{
public:
/**
* Determines whether @p qName is a valid QName. For example, "body" and "xhtml:body"
* is, but "xhtml::body" or "x:body "(note the whitespace) is not.
*
* @see QNameConstructor::expandQName()
* @see QNameValue
*/
static bool isQName(const QString &qName);
/**
* @short Splits @p qName into @p localName and @p prefix.
*
* @note @p qName must be a valid QName, and that is not checked.
*/
static void splitQName(const QString &qName, QString &prefix, QString &localName);
/**
* Determines whether @p ns is a reserved namespace.
*
* @see <a href="http://www.w3.org/TR/xslt20/#reserved-namespaces">XSL Transformations
* (XSLT) Version 2.0, 3.2 Reserved Namespaces</a>
* @see <a href="http://www.w3.org/TR/xquery/#FunctionDeclns">XQuery 1.0: An XML
* Query Language, 4.15 Function Declaration</a>
* @returns @c true if @p ns is a reserved namespace, otherwise @c false.
*/
static bool isReservedNamespace(const QXmlName::NamespaceCode ns);
/**
* Determines whether @p collation is a supported string collation. If it is
* not, error code @p code is raised via @p context.
*/
template<const ReportContext::ErrorCode code, typename TReportContext>
static inline void checkCollationSupport(const QString &collation,
const TReportContext &context,
const SourceLocationReflection *const r)
{
Q_ASSERT(context);
Q_ASSERT(r);
if(collation != QLatin1String(CommonNamespaces::UNICODE_COLLATION))
{
context->error(QtXmlPatterns::tr("Only the Unicode Codepoint "
"Collation is supported(%1). %2 is unsupported.")
.arg(formatURI(QLatin1String(CommonNamespaces::UNICODE_COLLATION)))
.arg(formatURI(collation)),
code, r);
}
}
static QPatternist::ItemTypePtr typeFromKind(const QXmlNodeModelIndex::NodeKind nodeKind);
/**
* Normalizes an @p uri by resolving it to the application directory if empty.
*/
static QUrl normalizeQueryURI(const QUrl &uri);
/**
* @short Determines whether @p consists only of whitespace. Characters
* considered whitespace are the ones for which QChar::isSpace() returns @c true for.
*
* For the empty string, @c true is returned.
*
* @returns @c true if @p string consists only of whitespace, otherwise @c false.
*/
static inline bool isWhitespaceOnly(const QStringRef &string)
{
const int len = string.length();
for(int i = 0; i < len; ++i)
{
if(!string.at(i).isSpace()) // TODO and this is wrong, see sdk/TODO
return false;
}
return true;
}
/**
* @overload
*/
static inline bool isWhitespaceOnly(const QString &string)
{
return isWhitespaceOnly(QStringRef(&string));
}
private:
/**
* @short This default constructor has no definition, in order to avoid
* instantiation, since it makes no sense to instantiate this class.
*/
inline XPathHelper();
Q_DISABLE_COPY(XPathHelper)
};
}
QT_END_NAMESPACE
#endif
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