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    41 

    42 #include "qbuiltintypes_p.h"

    43 #include "qcommonsequencetypes_p.h"

    44 #include "qitemmappingiterator_p.h"

    45 

    46 #include "qcopyof_p.h"

    47 

    48 QT_BEGIN_NAMESPACE

    49 

    50 using namespace QPatternist;

    51 

    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()))

    59 {

    60 }

    61 

    62 Expression::Ptr CopyOf::compress(const StaticContext::Ptr &context)

    63 {

    64     /* We have zero effect if we have these settings. */

    65     if(m_inheritNamespaces && m_preserveNamespaces)

    66         return m_operand->compress(context);

    67     else

    68     {

    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);

    74         else

    75             return SingleContainer::compress(context);

    76     }

    77 }

    78 

    79 void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const

    80 {

    81     /* Optimization: this completely breaks streaming. We get a call to

    82      * evaluateToSequenceReceiver() but we require heap allocations by calling

    83      * evaluateSequence(). */

    84 

    85     const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));

    86     QAbstractXmlReceiver *const receiver = context->outputReceiver();

    87     Item next(it->next());

    88 

    89     while(next)

    90     {

    91         if(next.isNode())

    92         {

    93             const QXmlNodeModelIndex &asNode = next.asNode();

    94             asNode.model()->copyNodeTo(asNode, receiver, m_settings);

    95         }

    96         else

    97             receiver->item(next);

    98 

    99         next = it->next();

   100     }

   101 }

   102 

   103 ExpressionVisitorResult::Ptr CopyOf::accept(const ExpressionVisitor::Ptr &visitor) const

   104 {

   105     return visitor->visit(this);

   106 }

   107 

   108 SequenceType::Ptr CopyOf::staticType() const

   109 {

   110     return m_operand->staticType();

   111 }

   112 

   113 SequenceType::List CopyOf::expectedOperandTypes() const

   114 {

   115     SequenceType::List result;

   116     result.append(CommonSequenceTypes::ZeroOrMoreItems);

   117     return result;

   118 }

   119 

   120 Expression::Properties CopyOf::properties() const

   121 {

   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;

   127 }

   128 

   129 ItemType::Ptr CopyOf::expectedContextItemType() const

   130 {

   131     return m_operand->expectedContextItemType();

   132 }

   133 

   134 QT_END_NAMESPACE