Expression::Ptr FunctionCall::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
/* We don't cache properties() at some stages because it can be invalidated
* by the typeCheck(). */
const FunctionSignature::Arity maxArgs = signature()->maximumArguments();
/* We do this before the typeCheck() such that the appropriate conversions
* are applied to the ContextItem. */
if(m_operands.count() < maxArgs &&
has(UseContextItem))
{
m_operands.append(Expression::Ptr(new ContextItem()));
context->addLocation(m_operands.last().data(), context->locationFor(this));
}
const Expression::Ptr me(UnlimitedContainer::typeCheck(context, reqType));
if(me.data() != this)
return me;
const Properties props(properties());
if((props & RewriteToEmptyOnEmpty) == RewriteToEmptyOnEmpty &&
*CommonSequenceTypes::Empty == *m_operands.first()->staticType()->itemType())
{
return EmptySequence::create(this, context);
}
if((props & LastOperandIsCollation) == LastOperandIsCollation &&
m_operands.count() == maxArgs)
{
m_operands.last() = Expression::Ptr(new CollationChecker(m_operands.last()));
context->addLocation(m_operands.last().data(), context->locationFor(this));
}
return me;
}
Expression::Ptr DocumentFN::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
/* See the class documentation for the rewrite that we're doing here. */
/* Generate type checking code for our operands such that they match. */
typeCheckOperands(context);
const QSourceLocation myLocation(context->locationFor(this));
const FunctionFactory::Ptr functions(context->functionSignatures());
Expression::Ptr uriSource;
{
Expression::List distinctValuesArgs;
distinctValuesArgs.append(m_operands.first());
uriSource = functions->createFunctionCall(QXmlName(StandardNamespaces::fn, StandardLocalNames::distinct_values),
distinctValuesArgs,
context,
this);
context->addLocation(uriSource.data(), myLocation);
}
const VariableSlotID rangeSlot = context->allocateRangeSlot();
const Expression::Ptr uriReference(new RangeVariableReference(uriSource, rangeSlot));
context->addLocation(uriReference.data(), myLocation);
Expression::List docArgs;
if(m_operands.count() == 2)
{
Expression::List baseUriArgs;
baseUriArgs.append(uriReference);
baseUriArgs.append(m_operands.at(1));
const Expression::Ptr fnBaseUri(functions->createFunctionCall(QXmlName(StandardNamespaces::fn, StandardLocalNames::resolve_uri),
baseUriArgs,
context,
this));
context->addLocation(fnBaseUri.data(), myLocation);
docArgs.append(fnBaseUri);
}
else
docArgs.append(uriReference);
const Expression::Ptr fnDoc(functions->createFunctionCall(QXmlName(StandardNamespaces::fn, StandardLocalNames::doc),
docArgs,
context,
this));
context->addLocation(fnDoc.data(), myLocation);
Expression::Ptr newMe(new ForClause(rangeSlot,
uriSource,
fnDoc,
-1 /* We have no position variable. */));
Expression::Ptr oldMe(this);
rewrite(oldMe, newMe, context);
return newMe->typeCheck(context, reqType);
}