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39
40#include "qbuiltintypes_p.h"
41#include "qcommonsequencetypes_p.h"
42#include "qitemmappingiterator_p.h"
43
44#include "qcopyof_p.h"
45
46QT_BEGIN_NAMESPACE
47
48using namespace QPatternist;
49
50CopyOf::CopyOf(const Expression::Ptr &operand,
51 const bool inheritNSS,
52 const bool preserveNSS) : SingleContainer(operand)
53 , m_inheritNamespaces(inheritNSS)
54 , m_preserveNamespaces(preserveNSS)
55 , m_settings((m_inheritNamespaces ? QAbstractXmlNodeModel::InheritNamespaces : QAbstractXmlNodeModel::NodeCopySettings()) |
56 (m_preserveNamespaces ? QAbstractXmlNodeModel::PreserveNamespaces : QAbstractXmlNodeModel::NodeCopySettings()))
57{
58}
59
60Expression::Ptr CopyOf::compress(const StaticContext::Ptr &context)
61{
62 /* We have zero effect if we have these settings. */
63 if(m_inheritNamespaces && m_preserveNamespaces)
64 return m_operand->compress(context);
65 else
66 {
67 const ItemType::Ptr t(m_operand->staticType()->itemType());
68 /* We have no effect on the empty sequence or atomic values. */
69 if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(other: t)
70 || *t == *CommonSequenceTypes::Empty)
71 return m_operand->compress(context);
72 else
73 return SingleContainer::compress(context);
74 }
75}
76
77void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
78{
79 /* Optimization: this completely breaks streaming. We get a call to
80 * evaluateToSequenceReceiver() but we require heap allocations by calling
81 * evaluateSequence(). */
82
83 const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
84 QAbstractXmlReceiver *const receiver = context->outputReceiver();
85 Item next(it->next());
86
87 while(next)
88 {
89 if(next.isNode())
90 {
91 const QXmlNodeModelIndex &asNode = next.asNode();
92 asNode.model()->copyNodeTo(node: asNode, receiver, m_settings);
93 }
94 else
95 receiver->item(item: next);
96
97 next = it->next();
98 }
99}
100
101ExpressionVisitorResult::Ptr CopyOf::accept(const ExpressionVisitor::Ptr &visitor) const
102{
103 return visitor->visit(this);
104}
105
106SequenceType::Ptr CopyOf::staticType() const
107{
108 return m_operand->staticType();
109}
110
111SequenceType::List CopyOf::expectedOperandTypes() const
112{
113 SequenceType::List result;
114 result.append(t: CommonSequenceTypes::ZeroOrMoreItems);
115 return result;
116}
117
118Expression::Properties CopyOf::properties() const
119{
120 /* We have the content of node constructors as children, but even though
121 * createCopyOf() typically avoids creating us, we can still end up with an operand
122 * that allows compression. We must always avoid that, because we don't have
123 * implementation of evaluateSequence(), and so on. */
124 return (m_operand->properties() & ~CreatesFocusForLast) | DisableElimination;
125}
126
127ItemType::Ptr CopyOf::expectedContextItemType() const
128{
129 return m_operand->expectedContextItemType();
130}
131
132QT_END_NAMESPACE
133

source code of qtxmlpatterns/src/xmlpatterns/expr/qcopyof.cpp