Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 247 insertions, 0 deletions

diff --git a/src/xmlpatterns/expr/qaxisstep.cpp b/src/xmlpatterns/expr/qaxisstep.cpp
new file mode 100644
index 0000000..40fe694
--- /dev/null
+++ b/src/xmlpatterns/expr/qaxisstep.cpp
@@ -0,0 +1,247 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 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