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42 #include "qcommonsequencetypes_p.h"
43 #include "qdelegatingnamespaceresolver_p.h"
44 #include "qnamespaceconstructor_p.h"
45 #include "qnodebuilder_p.h"
46 #include "qoutputvalidator_p.h"
47 #include "qqnamevalue_p.h"
48 #include "qstaticnamespacecontext_p.h"
50 #include "qelementconstructor_p.h"
54 using namespace QPatternist;
56 ElementConstructor::ElementConstructor(const Expression::Ptr &op1,
57 const Expression::Ptr &op2,
58 const bool isXSLT) : PairContainer(op1, op2)
63 Item ElementConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
65 const Item name(m_operand1->evaluateSingleton(context));
67 const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(m_staticBaseURI));
68 OutputValidator validator(nodeBuilder.data(), context, this, m_isXSLT);
70 const DynamicContext::Ptr receiverContext(context->createReceiverContext(&validator));
72 nodeBuilder->startElement(name.as<QNameValue>()->qName());
73 m_operand2->evaluateToSequenceReceiver(receiverContext);
74 nodeBuilder->endElement();
76 const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
77 context->addNodeModel(nm);
79 return nm->root(QXmlNodeModelIndex());
82 void ElementConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
84 /* We create an OutputValidator here too. If we're serializing(a common
85 * case, unfortunately) the receiver is already validating in order to
86 * catch cases where a computed attribute constructor is followed by an
87 * element constructor, but in the cases where we're not serializing it's
88 * necessary that we validate in this step. */
89 const Item name(m_operand1->evaluateSingleton(context));
90 QAbstractXmlReceiver *const receiver = context->outputReceiver();
92 OutputValidator validator(receiver, context, this, m_isXSLT);
93 const DynamicContext::Ptr receiverContext(context->createReceiverContext(&validator));
95 receiver->startElement(name.as<QNameValue>()->qName());
96 m_operand2->evaluateToSequenceReceiver(receiverContext);
97 receiver->endElement();
100 Expression::Ptr ElementConstructor::typeCheck(const StaticContext::Ptr &context,
101 const SequenceType::Ptr &reqType)
103 /* What does this code do? When type checking our children, our namespace
104 * bindings, which are also children of the form of NamespaceConstructor
105 * instances, must be statically in-scope for them, so find them and
106 * shuffle their bindings into the StaticContext. */
108 m_staticBaseURI = context->baseURI();
110 /* Namespace declarations changes the in-scope bindings, so let's
111 * first lookup our child NamespaceConstructors. */
112 const ID operandID = m_operand2->id();
114 NamespaceResolver::Bindings overrides;
115 if(operandID == IDExpressionSequence)
117 const Expression::List operands(m_operand2->operands());
118 const int len = operands.count();
120 for(int i = 0; i < len; ++i)
122 if(operands.at(i)->is(IDNamespaceConstructor))
124 const QXmlName &nb = operands.at(i)->as<NamespaceConstructor>()->namespaceBinding();
125 overrides.insert(nb.prefix(), nb.namespaceURI());
130 const NamespaceResolver::Ptr newResolver(new DelegatingNamespaceResolver(context->namespaceBindings(), overrides));
131 const StaticContext::Ptr augmented(new StaticNamespaceContext(newResolver, context));
133 return PairContainer::typeCheck(augmented, reqType);
136 SequenceType::Ptr ElementConstructor::staticType() const
138 return CommonSequenceTypes::ExactlyOneElement;
141 SequenceType::List ElementConstructor::expectedOperandTypes() const
143 SequenceType::List result;
144 result.append(CommonSequenceTypes::ExactlyOneQName);
145 result.append(CommonSequenceTypes::ZeroOrMoreItems);
149 Expression::Properties ElementConstructor::properties() const
151 return DisableElimination | IsNodeConstructor;
154 ExpressionVisitorResult::Ptr
155 ElementConstructor::accept(const ExpressionVisitor::Ptr &visitor) const
157 return visitor->visit(this);