--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/expr/qaxisstep.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,247 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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