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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qitemmappingiterator_p.h"
#include "qgenericsequencetype_p.h"
#include "qparentnodeaxis_p.h"
#include "qaxisstep_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
namespace QPatternist
{
/**
* This operator is needed for the s_whenAxisNodeKindEmpty array. The @c int constructors
* ensure we invoke another operator| such that we don't get an infinite loop.
*/
static inline QXmlNodeModelIndex::NodeKind operator|(const QXmlNodeModelIndex::NodeKind &op1, const QXmlNodeModelIndex::NodeKind &op2)
{
return QXmlNodeModelIndex::NodeKind(int(op1) | int(op2));
}
}
/**
* @note The order is significant. It is of the same order as the values in QXmlNodeModelIndex::Axis is declared.
*/
const QXmlNodeModelIndex::NodeKind AxisStep::s_whenAxisNodeKindEmpty[] =
{
QXmlNodeModelIndex::Attribute|QXmlNodeModelIndex::Text|QXmlNodeModelIndex::ProcessingInstruction|QXmlNodeModelIndex::Comment|QXmlNodeModelIndex::Namespace, // child;
QXmlNodeModelIndex::Attribute|QXmlNodeModelIndex::Text|QXmlNodeModelIndex::ProcessingInstruction|QXmlNodeModelIndex::Comment|QXmlNodeModelIndex::Namespace, // descendant;
QXmlNodeModelIndex::Document|QXmlNodeModelIndex::Attribute|QXmlNodeModelIndex::Text|QXmlNodeModelIndex::ProcessingInstruction|QXmlNodeModelIndex::Comment|QXmlNodeModelIndex::Namespace,// attribute;
QXmlNodeModelIndex::NodeKind(0), // self;
QXmlNodeModelIndex::NodeKind(0), // descendant-or-self;
QXmlNodeModelIndex::Document|QXmlNodeModelIndex::Attribute|QXmlNodeModelIndex::Text|QXmlNodeModelIndex::ProcessingInstruction|QXmlNodeModelIndex::Comment|QXmlNodeModelIndex::Namespace, // namespace;
QXmlNodeModelIndex::Document, // following;
QXmlNodeModelIndex::Document, // parent;
QXmlNodeModelIndex::Document, // ancestor
QXmlNodeModelIndex::Document|QXmlNodeModelIndex::Attribute|QXmlNodeModelIndex::Namespace, // preceding-sibling;
QXmlNodeModelIndex::Document|QXmlNodeModelIndex::Attribute|QXmlNodeModelIndex::Namespace, // following-sibling;
QXmlNodeModelIndex::Document, // preceding;
QXmlNodeModelIndex::NodeKind(0) // ancestor-or-self;
};
bool AxisStep::isAlwaysEmpty(const QXmlNodeModelIndex::Axis axis, const QXmlNodeModelIndex::NodeKind nodeKind)
{
return (s_whenAxisNodeKindEmpty[(1 >> axis) - 1] & nodeKind) != 0;
}
AxisStep::AxisStep(const QXmlNodeModelIndex::Axis a,
const ItemType::Ptr &nt) : m_axis(a),
m_nodeTest(nt)
{
Q_ASSERT(m_nodeTest);
Q_ASSERT_X(BuiltinTypes::node->xdtTypeMatches(m_nodeTest), Q_FUNC_INFO,
"We assume we're a node type.");
}
Item AxisStep::mapToItem(const QXmlNodeModelIndex &node,
const DynamicContext::Ptr &context) const
{
Q_ASSERT(!node.isNull());
Q_ASSERT(Item(node).isNode());
Q_ASSERT(Item(node));
Q_UNUSED(context);
if(m_nodeTest->itemMatches(Item(node)))
return Item(node);
else
return Item();
}
Item::Iterator::Ptr AxisStep::evaluateSequence(const DynamicContext::Ptr &context) const
{
/* If we don't have a focus, it's either a bug or our parent isn't a Path
* that have advanced the focus iterator. Hence, attempt to advance the focus on our own. */
if(!context->contextItem())
context->focusIterator()->next();
Q_ASSERT(context->contextItem());
const QXmlNodeModelIndex::Iterator::Ptr source(context->contextItem().asNode().iterate(m_axis));
return makeItemMappingIterator<Item>(ConstPtr(this), source, context);
}
Item AxisStep::evaluateSingleton(const DynamicContext::Ptr &context) const
{
/* If we don't have a focus, it's either a bug or our parent isn't a Path
* that have advanced the focus iterator. Hence, attempt to advance the focus on our own. */
if(!context->contextItem())
context->focusIterator()->next();
Q_ASSERT(context->contextItem());
const QXmlNodeModelIndex::Iterator::Ptr it(context->contextItem().asNode().iterate(m_axis));
QXmlNodeModelIndex next(it->next());
while(!next.isNull())
{
const Item candidate(mapToItem(next, context));
if(candidate)
return candidate;
else
next = it->next();
};
return Item();
}
Expression::Ptr AxisStep::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
if(m_axis == QXmlNodeModelIndex::AxisParent && *m_nodeTest == *BuiltinTypes::node)
{
/* We only rewrite parent::node() to ParentNodeAxis. */
return rewrite(Expression::Ptr(new ParentNodeAxis()), context)->typeCheck(context, reqType);
}
/* TODO temporarily disabled
else if(isAlwaysEmpty(m_axis, static_cast<const AnyNodeType *>(m_nodeTest.data())->nodeKind()))
return EmptySequence::create(this, context);
*/
else
return EmptyContainer::typeCheck(context, reqType);
}
SequenceType::Ptr AxisStep::staticType() const
{
Cardinality cardinality;
if(m_axis == QXmlNodeModelIndex::AxisSelf || m_axis == QXmlNodeModelIndex::AxisParent)
cardinality = Cardinality::zeroOrOne();
else
cardinality = Cardinality::zeroOrMore();
return makeGenericSequenceType(m_nodeTest,
cardinality);
}
SequenceType::List AxisStep::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreNodes);
return result;
}
Expression::Properties AxisStep::properties() const
{
return RequiresContextItem | DisableElimination;
}
ItemType::Ptr AxisStep::expectedContextItemType() const
{
return BuiltinTypes::node;
}
ExpressionVisitorResult::Ptr AxisStep::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
QXmlNodeModelIndex::Axis AxisStep::axis() const
{
return m_axis;
}
QString AxisStep::axisName(const QXmlNodeModelIndex::Axis axis)
{
const char *result = 0;
switch(axis)
{
/* These must not be translated. */
case QXmlNodeModelIndex::AxisAncestorOrSelf: result = "ancestor-or-self"; break;
case QXmlNodeModelIndex::AxisAncestor: result = "ancestor"; break;
case QXmlNodeModelIndex::AxisAttributeOrTop: result = "attribute-or-top"; break;
case QXmlNodeModelIndex::AxisAttribute: result = "attribute"; break;
case QXmlNodeModelIndex::AxisChildOrTop: result = "child-or-top"; break;
case QXmlNodeModelIndex::AxisChild: result = "child"; break;
case QXmlNodeModelIndex::AxisDescendantOrSelf: result = "descendant-or-self"; break;
case QXmlNodeModelIndex::AxisDescendant: result = "descendant"; break;
case QXmlNodeModelIndex::AxisFollowing: result = "following"; break;
case QXmlNodeModelIndex::AxisFollowingSibling: result = "following-sibling"; break;
case QXmlNodeModelIndex::AxisNamespace: result = "namespace"; break;
case QXmlNodeModelIndex::AxisParent: result = "parent"; break;
case QXmlNodeModelIndex::AxisPreceding: result = "preceding"; break;
case QXmlNodeModelIndex::AxisPrecedingSibling: result = "preceding-sibling"; break;
case QXmlNodeModelIndex::AxisSelf: result = "self"; break;
}
Q_ASSERT_X(result, Q_FUNC_INFO, "An unknown axis type was apparently encountered.");
return QString::fromLatin1(result);
}
PatternPriority AxisStep::patternPriority() const
{
return static_cast<const AnyNodeType *>(m_nodeTest.data())->patternPriority();
}
Expression::ID AxisStep::id() const
{
return IDAxisStep;
}
QT_END_NAMESPACE
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