Item GenericPredicate::evaluateSingleton(const DynamicContext::Ptr &context) const
{
const Item::Iterator::Ptr focus(m_operand1->evaluateSequence(context));
const DynamicContext::Ptr newContext(context->createFocus());
newContext->setFocusIterator(focus);
return mapToItem(focus->next(), newContext);
}
Item::Iterator::Ptr ApplyTemplate::evaluateSequence(const DynamicContext::Ptr &context) const
{
const TemplateMode::Ptr templateMode(effectiveMode(context));
const Template::Ptr &templateMatch = findTemplate(context, templateMode);
if(templateMatch)
return templateMatch->body->evaluateSequence(templateMatch->createContext(this, context, false));
else
{
/* None of our templates matched. Proceed with a built-in. */
const Item current(context->contextItem());
// TODO it can be an atomic value?
const QXmlNodeModelIndex::NodeKind kind(current.asNode().kind());
if(kind == QXmlNodeModelIndex::Element || kind == QXmlNodeModelIndex::Document)
{
pDebug() << "No template match, using builtin template for element() | document-node()";
const Item::Iterator::Ptr focusIterator(makeItemMappingIterator<Item>(ConstPtr(this),
current.asNode().iterate(QXmlNodeModelIndex::AxisChild),
context));
const DynamicContext::Ptr focus(context->createFocus());
focus->setFocusIterator(focusIterator);
return makeSequenceMappingIterator<Item>(ConstPtr(this), focusIterator, focus);
}
return CommonValues::emptyIterator;
}
}
Item::Iterator::Ptr GenericPredicate::evaluateSequence(const DynamicContext::Ptr &context) const
{
const Item::Iterator::Ptr focus(m_operand1->evaluateSequence(context));
const DynamicContext::Ptr newContext(context->createFocus());
newContext->setFocusIterator(focus);
return makeItemMappingIterator<Item>(ConstPtr(this),
focus,
newContext);
}
void Path::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
/* Note, we use the old context for m_operand1. */
const Item::Iterator::Ptr source(m_operand1->evaluateSequence(context));
const DynamicContext::Ptr focus(context->createFocus());
focus->setFocusIterator(source);
while(source->next())
m_operand2->evaluateToSequenceReceiver(focus);
}
Item::Iterator::Ptr Path::evaluateSequence(const DynamicContext::Ptr &context) const
{
/* Note, we use the old context for m_operand1. */
const Item::Iterator::Ptr source(m_operand1->evaluateSequence(context));
const DynamicContext::Ptr focus(context->createFocus());
focus->setFocusIterator(source);
const Item::Iterator::Ptr result(makeSequenceMappingIterator<Item>(ConstPtr(this), source, focus));
if(m_checkXPTY0018)
{
/* This is an expensive code path, but it should happen very rarely. */
enum FoundItem
{
FoundNone,
FoundNode,
FoundAtomicValue
} hasFound = FoundNone;
Item::List whenChecked;
Item next(result->next());
while(next)
{
const FoundItem found = next.isAtomicValue() ? FoundAtomicValue : FoundNode;
if(hasFound != FoundNone && hasFound != found)
{
/* It's an atomic value and we've already found a node. Mixed content. */
context->error(QtXmlPatterns::tr("The last step in a path must contain either nodes "
"or atomic values. It cannot be a mixture between the two."),
ReportContext::XPTY0018, this);
}
else
hasFound = found;
whenChecked.append(next);
next = result->next();
}
return makeListIterator(whenChecked);
}
else
return result;
}
Item Path::evaluateSingleton(const DynamicContext::Ptr &context) const
{
/* This function is called if both operands' cardinality is exactly-one. Therefore
* we manually go forward in the focus by calling next().
*
* We don't check for XPTY0018, only in evaluateSequence(), since if we're guaranteed
* to evaluate to one item, we can only evaluate to one node or one atomic value.
*/
/* Note, we use the old context for m_operand1. */
const Item::Iterator::Ptr source(m_operand1->evaluateSequence(context));
const DynamicContext::Ptr focus(context->createFocus());
focus->setFocusIterator(source);
/* This test is needed because if the focus is empty, we don't want to(nor can't) evaluate
* the next step. */
// TODO Why are we at all invoked then?
if(source->next())
return m_operand2->evaluateSingleton(focus);
else
return Item();
}