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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, 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.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtDebug>
#include "qaxisstep_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qitemmappingiterator_p.h"
#include "qsequencemappingiterator_p.h"
#include "qpatternistlocale_p.h"
#include "qapplytemplate_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
ApplyTemplate::ApplyTemplate(const TemplateMode::Ptr &mode,
const WithParam::Hash &withParams,
const TemplateMode::Ptr &defaultMode) : TemplateInvoker(withParams)
, m_mode(mode)
, m_defaultMode(defaultMode)
{
Q_ASSERT_X(m_mode || m_defaultMode, Q_FUNC_INFO,
"Either a mode, or the default mode must be supplied.");
}
Item ApplyTemplate::mapToItem(const QXmlNodeModelIndex &node,
const DynamicContext::Ptr &) const
{
return Item(node);
}
Item::Iterator::Ptr ApplyTemplate::mapToSequence(const Item &item,
const DynamicContext::Ptr &context) const
{
Q_UNUSED(item);
return evaluateSequence(context);
}
TemplateMode::Ptr ApplyTemplate::effectiveMode(const DynamicContext::Ptr &context) const
{
if(m_mode)
return m_mode;
else
{
const TemplateMode::Ptr currentMode(context->currentTemplateMode());
if(currentMode)
return currentMode;
else
return m_defaultMode;
}
}
Template::Ptr ApplyTemplate::findTemplate(const DynamicContext::Ptr &context,
const TemplateMode::Ptr &templateMode) const
{
const int count = templateMode->templatePatterns.count();
Template::Ptr result;
/* It's redundant to initialize these values, but it suppresses false
* positives with GCC. */
PatternPriority priority = 0;
TemplatePattern::ID id = -1;
/* Possible optimization: detecting ambiguous rule matches could be forked off to a
* low prioirity thread. */
for(int i = 0; i < count; ++i)
{
const TemplatePattern::Ptr &candidate = templateMode->templatePatterns.at(i);
if(candidate->matchPattern()->evaluateEBV(context))
{
if(result)
{
if( candidate->id() != id
&& candidate->priority() == priority
&& candidate->templateTarget()->importPrecedence ==
result->importPrecedence)
{
context->error(QtXmlPatterns::tr("Ambiguous rule match."),
ReportContext::XTRE0540, this);
}
else
break;
}
else
{
result = candidate->templateTarget();
priority = candidate->priority();
id = candidate->id();
}
}
}
return result;
}
Item::Iterator::Ptr ApplyTemplate::evaluateSequence(const DynamicContext::Ptr &context) const
{
const TemplateMode::Ptr templateMode(effectiveMode(context));
const Template::Ptr &templateMatch = findTemplate(context, templateMode);
if(templateMatch)
return templateMatch->body->evaluateSequence(templateMatch->createContext(this, context, false));
else
{
/* None of our templates matched. Proceed with a built-in. */
const Item current(context->contextItem());
// TODO it can be an atomic value?
const QXmlNodeModelIndex::NodeKind kind(current.asNode().kind());
if(kind == QXmlNodeModelIndex::Element || kind == QXmlNodeModelIndex::Document)
{
pDebug() << "No template match, using builtin template for element() | document-node()";
const Item::Iterator::Ptr focusIterator(makeItemMappingIterator<Item>(ConstPtr(this),
current.asNode().iterate(QXmlNodeModelIndex::AxisChild),
context));
const DynamicContext::Ptr focus(context->createFocus());
focus->setFocusIterator(focusIterator);
return makeSequenceMappingIterator<Item>(ConstPtr(this), focusIterator, focus);
}
return CommonValues::emptyIterator;
}
}
Expression::Ptr ApplyTemplate::compress(const StaticContext::Ptr &context)
{
/* If we have a mode, we will never need the default mode. */
if(m_mode)
m_defaultMode.reset();
return TemplateInvoker::compress(context);
}
SequenceType::Ptr ApplyTemplate::staticType() const
{
return CommonSequenceTypes::ZeroOrMoreItems;
}
ExpressionVisitorResult::Ptr ApplyTemplate::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
Expression::Properties ApplyTemplate::properties() const
{
return RequiresFocus | DisableElimination;
}
bool ApplyTemplate::configureRecursion(const CallTargetDescription::Ptr &sign)
{
Q_ASSERT_X(false, Q_FUNC_INFO, "We're not expected to be called.");
Q_UNUSED(sign);
return false;
}
Expression::Ptr ApplyTemplate::body() const
{
Q_ASSERT_X(false, Q_FUNC_INFO, "We're not expected to be called.");
return Expression::Ptr();
}
CallTargetDescription::Ptr ApplyTemplate::callTargetDescription() const
{
Q_ASSERT_X(false, Q_FUNC_INFO, "We're not expected to be called.");
return CallTargetDescription::Ptr();
}
QT_END_NAMESPACE
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