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42 #include "qbuiltintypes_p.h"
43 #include "qcommonsequencetypes_p.h"
44 #include "qitemmappingiterator_p.h"
46 #include "qcopyof_p.h"
50 using namespace QPatternist;
52 CopyOf::CopyOf(const Expression::Ptr &operand,
53 const bool inheritNSS,
54 const bool preserveNSS) : SingleContainer(operand)
55 , m_inheritNamespaces(inheritNSS)
56 , m_preserveNamespaces(preserveNSS)
57 , m_settings((m_inheritNamespaces ? QAbstractXmlNodeModel::InheritNamespaces : QAbstractXmlNodeModel::NodeCopySettings()) |
58 (m_preserveNamespaces ? QAbstractXmlNodeModel::PreserveNamespaces : QAbstractXmlNodeModel::NodeCopySettings()))
62 Expression::Ptr CopyOf::compress(const StaticContext::Ptr &context)
64 /* We have zero effect if we have these settings. */
65 if(m_inheritNamespaces && m_preserveNamespaces)
66 return m_operand->compress(context);
69 const ItemType::Ptr t(m_operand->staticType()->itemType());
70 /* We have no effect on the empty sequence or atomic values. */
71 if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t)
72 || *t == *CommonSequenceTypes::Empty)
73 return m_operand->compress(context);
75 return SingleContainer::compress(context);
79 void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
81 /* Optimization: this completely breaks streaming. We get a call to
82 * evaluateToSequenceReceiver() but we require heap allocations by calling
83 * evaluateSequence(). */
85 const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
86 QAbstractXmlReceiver *const receiver = context->outputReceiver();
87 Item next(it->next());
93 const QXmlNodeModelIndex &asNode = next.asNode();
94 asNode.model()->copyNodeTo(asNode, receiver, m_settings);
103 ExpressionVisitorResult::Ptr CopyOf::accept(const ExpressionVisitor::Ptr &visitor) const
105 return visitor->visit(this);
108 SequenceType::Ptr CopyOf::staticType() const
110 return m_operand->staticType();
113 SequenceType::List CopyOf::expectedOperandTypes() const
115 SequenceType::List result;
116 result.append(CommonSequenceTypes::ZeroOrMoreItems);
120 Expression::Properties CopyOf::properties() const
122 /* We have the content of node constructors as children, but even though
123 * createCopyOf() typically avoids creating us, we can still end up with an operand
124 * that allows compression. We must always avoid that, because we don't have
125 * implementation of evaluateSequence(), and so on. */
126 return (m_operand->properties() & ~CreatesFocusForLast) | DisableElimination;
129 ItemType::Ptr CopyOf::expectedContextItemType() const
131 return m_operand->expectedContextItemType();