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     7 ** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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    41 

    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"

    49 

    50 #include "qelementconstructor_p.h"

    51 

    52 QT_BEGIN_NAMESPACE

    53 

    54 using namespace QPatternist;

    55 

    56 ElementConstructor::ElementConstructor(const Expression::Ptr &op1,

    57                                        const Expression::Ptr &op2,

    58                                        const bool isXSLT) : PairContainer(op1, op2)

    59                                                           , m_isXSLT(isXSLT)

    60 {

    61 }

    62 

    63 Item ElementConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const

    64 {

    65     const Item name(m_operand1->evaluateSingleton(context));

    66 

    67     const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(m_staticBaseURI));

    68     OutputValidator validator(nodeBuilder.data(), context, this, m_isXSLT);

    69 

    70     const DynamicContext::Ptr receiverContext(context->createReceiverContext(&validator));

    71 

    72     nodeBuilder->startElement(name.as<QNameValue>()->qName());

    73     m_operand2->evaluateToSequenceReceiver(receiverContext);

    74     nodeBuilder->endElement();

    75 

    76     const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());

    77     context->addNodeModel(nm);

    78 

    79     return nm->root(QXmlNodeModelIndex());

    80 }

    81 

    82 void ElementConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const

    83 {

    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();

    91 

    92     OutputValidator validator(receiver, context, this, m_isXSLT);

    93     const DynamicContext::Ptr receiverContext(context->createReceiverContext(&validator));

    94 

    95     receiver->startElement(name.as<QNameValue>()->qName());

    96     m_operand2->evaluateToSequenceReceiver(receiverContext);

    97     receiver->endElement();

    98 }

    99 

   100 Expression::Ptr ElementConstructor::typeCheck(const StaticContext::Ptr &context,

   101                                               const SequenceType::Ptr &reqType)

   102 {

   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. */

   107 

   108     m_staticBaseURI = context->baseURI();

   109 

   110     /* Namespace declarations changes the in-scope bindings, so let's

   111      * first lookup our child NamespaceConstructors. */

   112     const ID operandID = m_operand2->id();

   113 

   114     NamespaceResolver::Bindings overrides;

   115     if(operandID == IDExpressionSequence)

   116     {

   117         const Expression::List operands(m_operand2->operands());

   118         const int len = operands.count();

   119 

   120         for(int i = 0; i < len; ++i)

   121         {

   122             if(operands.at(i)->is(IDNamespaceConstructor))

   123             {

   124                 const QXmlName &nb = operands.at(i)->as<NamespaceConstructor>()->namespaceBinding();

   125                 overrides.insert(nb.prefix(), nb.namespaceURI());

   126             }

   127         }

   128     }

   129 

   130     const NamespaceResolver::Ptr newResolver(new DelegatingNamespaceResolver(context->namespaceBindings(), overrides));

   131     const StaticContext::Ptr augmented(new StaticNamespaceContext(newResolver, context));

   132 

   133     return PairContainer::typeCheck(augmented, reqType);

   134 }

   135 

   136 SequenceType::Ptr ElementConstructor::staticType() const

   137 {

   138     return CommonSequenceTypes::ExactlyOneElement;

   139 }

   140 

   141 SequenceType::List ElementConstructor::expectedOperandTypes() const

   142 {

   143     SequenceType::List result;

   144     result.append(CommonSequenceTypes::ExactlyOneQName);

   145     result.append(CommonSequenceTypes::ZeroOrMoreItems);

   146     return result;

   147 }

   148 

   149 Expression::Properties ElementConstructor::properties() const

   150 {

   151     return DisableElimination | IsNodeConstructor;

   152 }

   153 

   154 ExpressionVisitorResult::Ptr

   155 ElementConstructor::accept(const ExpressionVisitor::Ptr &visitor) const

   156 {

   157     return visitor->visit(this);

   158 }

   159 

   160 QT_END_NAMESPACE