public override AstNode Visit(AttributeInstance node)
{
// Read the attribute type.
Expression attrExpr = node.GetAttributeExpr();
if(attrExpr is ObjectReferenceExpression)
{
ObjectReferenceExpression refExpr = (ObjectReferenceExpression)attrExpr;
refExpr.SetAttributeName(true);
}
attrExpr.Accept(this);
// Get his type.
IChelaType attrType = attrExpr.GetNodeType();
attrType = ExtractActualType(attrExpr, attrType);
if(!attrType.IsClass())
Error(node, "attributes must be classes.");
// Make sure is derived from the Attribute class.
Class attributeClass = currentModule.GetAttributeClass();
Class attrBuilding = (Class)attrType;
if(!attrBuilding.IsDerivedFrom(attributeClass))
Error(node, "invalid attribute class.");
// Store the attribute class.
node.SetAttributeClass(attrBuilding);
// Visit the attribute arguments.
AstNode arg = node.GetArguments();
List<object> arguments = new List<object> ();
bool readingProperties = false;
while(arg != null)
{
// Store the attribute type.
AttributeArgument attrArg = (AttributeArgument)arg;
attrArg.SetAttributeClass(attrBuilding);
// Visit the argument.
arg.Accept(this);
// Check property/vs constructor argument.
bool propertyArgument = !string.IsNullOrEmpty(arg.GetName());
if(propertyArgument)
{
// Start/started reading properties values.
readingProperties = true;
}
else
{
// Check for unnamed value.
if(readingProperties)
Error(arg, "expected attribute property value.");
// Store the argument.
arguments.Add(arg.GetNodeType());
}
// Visit the next argument.
arg = arg.GetNext();
}
// Pick the correct attribute constructor.
FunctionGroup ctorGroup = attrBuilding.GetConstructor();
Function ctor = PickFunction(node, ctorGroup, false, null, arguments, false);
if(!ctor.IsMethod())
Error(node, "invalid constructor."); // Shouldn't reach here.
// Store the picked constructor.
node.SetAttributeConstructor((Method)ctor);
return node;
}
