public QilNode GenerateInvoke(QilFunction func, IList <XslNode> actualArgs)
{
_iterStack.Clear();
_formalArgs = func.Arguments;
_invokeArgs = _fac.ActualParameterList();
// curArg is an instance variable used in Clone() method
for (_curArg = 0; _curArg < _formalArgs.Count; _curArg++)
{
// Find actual value for a given formal arg
QilParameter formalArg = (QilParameter)_formalArgs[_curArg];
QilNode? invokeArg = FindActualArg(formalArg, actualArgs);
// If actual value was not specified, use the default value and copy its debug comment
if (invokeArg == null)
{
if (_debug)
{
if (formalArg.Name !.NamespaceUri == XmlReservedNs.NsXslDebug)
{
Debug.Assert(formalArg.Name.LocalName == "namespaces", "Cur,Pos,Last don't have default values and should be always added to by caller in AddImplicitArgs()");
Debug.Assert(formalArg.DefaultValue != null, "PrecompileProtoTemplatesHeaders() set it");
invokeArg = Clone(formalArg.DefaultValue);
}
else
{
invokeArg = _fac.DefaultValueMarker();
}
}
else
{
Debug.Assert(formalArg.Name !.NamespaceUri != XmlReservedNs.NsXslDebug, "Cur,Pos,Last don't have default values and should be always added to by caller in AddImplicitArgs(). We don't have $namespaces in !debug.");
invokeArg = Clone(formalArg.DefaultValue !);
}
}
XmlQueryType formalType = formalArg.XmlType !;
XmlQueryType invokeType = invokeArg.XmlType !;
// Possible arg types: anyType, node-set, string, boolean, and number
_fac.CheckXsltType(formalArg);
_fac.CheckXsltType(invokeArg);
if (!invokeType.IsSubtypeOf(formalType))
{
// This may occur only if inferred type of invokeArg is XslFlags.None
Debug.Assert(invokeType == T.ItemS, "Actual argument type is not a subtype of formal argument type");
invokeArg = _fac.TypeAssert(invokeArg, formalType);
}
_invokeArgs.Add(invokeArg);
}
//-----------------------------------------------
// QilVisitor overrides
//-----------------------------------------------
protected override QilNode VisitChildren(QilNode parent)
{
if (this.parents.Contains(parent))
{
// We have already visited the node that starts the infinite loop, but don't visit its children
SetError(parent, "Infinite loop");
}
else if (AddNode(parent))
{
if (parent.XmlType == null)
{
SetError(parent, "Type information missing");
}
else
{
XmlQueryType type = _typeCheck.Check(parent);
// BUGBUG: Hack to account for Xslt compiler type fixups
if (!type.IsSubtypeOf(parent.XmlType))
{
SetError(parent, "Type information was not correctly inferred");
}
}
this.parents.Add(parent, parent);
for (int i = 0; i < parent.Count; i++)
{
if (parent[i] == null)
{
// Allow parameter name and default value to be null
if (parent.NodeType == QilNodeType.Parameter)
{
continue;
}
// Do not allow null anywhere else in the graph
else
{
SetError(parent, "Child " + i + " must not be null");
}
}
if (parent.NodeType == QilNodeType.GlobalVariableList ||
parent.NodeType == QilNodeType.GlobalParameterList ||
parent.NodeType == QilNodeType.FunctionList)
{
if (((QilReference)parent[i]).DebugName == null)
{
SetError(parent[i], "DebugName must not be null");
}
}
// If child is a reference, then call VisitReference instead of Visit in order to avoid circular visits.
if (IsReference(parent, i))
{
VisitReference(parent[i]);
}
else
{
Visit(parent[i]);
}
}
this.parents.Remove(parent);
}
return(parent);
}
/// <summary>
/// Adds itemType to a union. Returns false if new item is a subtype of one of the types in the list.
/// </summary>
private static void AddItemToChoice(List<XmlQueryType> accumulator, XmlQueryType itemType) {
Debug.Assert(itemType.IsSingleton, "All types should be prime.");
bool addToList = true;
for (int i = 0; i < accumulator.Count; i++) {
// If new prime is a subtype of existing prime, don't add it to the union
if (itemType.IsSubtypeOf(accumulator[i])) {
return;
}
// If new prime is a subtype of existing prime, then replace the existing prime with new prime
if (accumulator[i].IsSubtypeOf(itemType)) {
if (addToList) {
addToList = false;
accumulator[i] = itemType;
}
else {
accumulator.RemoveAt(i);
i --;
}
}
}
if (addToList) {
accumulator.Add(itemType);
}
}
/// <summary>
/// Construct the intersection of two lists of prime XmlQueryTypes.
/// </summary>
private XmlQueryType IntersectItemTypes(XmlQueryType left, XmlQueryType right) {
Debug.Assert(left.Count == 1 && left.IsSingleton, "left should be an item");
Debug.Assert(right.Count == 1 && right.IsSingleton, "right should be an item");
if (left.TypeCode == right.TypeCode && (left.NodeKinds & (XmlNodeKindFlags.Document | XmlNodeKindFlags.Element | XmlNodeKindFlags.Attribute)) != 0) {
if (left.TypeCode == XmlTypeCode.Node) {
return left;
}
// Intersect name tests
XmlQualifiedNameTest nameTest = left.NameTest.Intersect(right.NameTest);
// Intersect types
XmlSchemaType type = XmlSchemaType.IsDerivedFrom(left.SchemaType, right.SchemaType, /* except:*/XmlSchemaDerivationMethod.Empty) ? left.SchemaType :
XmlSchemaType.IsDerivedFrom(right.SchemaType, left.SchemaType, /* except:*/XmlSchemaDerivationMethod.Empty) ? right.SchemaType : null;
bool isNillable = left.IsNillable && right.IsNillable;
if ((object)nameTest == (object)left.NameTest && type == left.SchemaType && isNillable == left.IsNillable) {
// left is a subtype of right return left
return left;
}
else if ((object)nameTest == (object)right.NameTest && type == right.SchemaType && isNillable == right.IsNillable) {
// right is a subtype of left return right
return right;
}
else if (nameTest != null && type != null) {
// create a new type
return ItemType.Create(left.TypeCode, nameTest, type, isNillable);
}
}
else if (left.IsSubtypeOf(right)) {
// left is a subset of right, so left is in the intersection
return left;
}
else if (right.IsSubtypeOf(left)) {
// right is a subset of left, so right is in the intersection
return right;
}
return None;
}