public EventAccessorDefinition(MemberFlags flags, string name, AstNode children, TokenPosition position)
: base(children, position)
{
SetName(name);
this.flags = flags;
this.eventVariable = null;
this.function = null;
this.selfLocal = null;
this.valueLocal = null;
}
public EventDefinition(MemberFlags flags, Expression eventType,
string name, AstNode accessors, TokenPosition position)
: base(position)
{
SetName(name);
this.flags = flags;
this.eventType = eventType;
this.eventVariable = null;
this.accessors = accessors;
this.delegateType = null;
}
public void SetEvent(EventVariable eventVariable)
{
this.eventVariable = eventVariable;
}
private void CreateSimplifiedEventFunction(AstNode node, EventVariable eventVariable, FunctionType functionType, bool isAdd)
{
// Create the function name.
string functionName = (isAdd ? "add_" : "remove_") + eventVariable.GetName();
// Create the function.
Function function;
if(functionType.GetArgumentCount() > 1)
function = new Method(functionName, eventVariable.GetFlags(), currentContainer);
else
function = new Function(functionName, eventVariable.GetFlags(), currentContainer);
// Set the function type.
function.SetFunctionType(functionType);
// Set the function position.
function.Position = node.GetPosition();
// Store the function in the event.
if(isAdd)
eventVariable.AddModifier = function;
else
eventVariable.RemoveModifier = function;
// Store the function in his container.
if(currentContainer.IsStructure() || currentContainer.IsClass() || currentContainer.IsInterface())
{
Structure building = (Structure)currentContainer;
building.AddFunction(functionName, function);
}
else if(currentContainer.IsNamespace())
{
Namespace space = (Namespace)currentContainer;
space.AddMember(function);
}
else
{
Error(node, "an event cannot be declared here.");
}
}
public override AstNode Visit(EventDefinition node)
{
// Find an existing event.
ScopeMember oldEvent = currentContainer.FindMember(node.GetName());
if(oldEvent != null)
{
if(oldEvent.IsEvent())
Error(node, "trying to redefine an event.");
else
Error(node, "trying to override something with an event.");
}
// Visit the type expression.
Expression typeExpr = node.GetEventType();
typeExpr.Accept(this);
// Extract the meta type.
IChelaType eventType = typeExpr.GetNodeType();
eventType = ExtractActualType(typeExpr, eventType);
// Make sure the event type is a class..
if(!eventType.IsClass())
Error(typeExpr, "event types must be delegates.");
// Store the delegate type.
Class delegateType = (Class)eventType;
node.SetDelegateType(delegateType);
// The actual event type is a reference.
eventType = ReferenceType.Create(eventType);
// Create the event.
EventVariable eventVariable =
new EventVariable(node.GetName(), node.GetFlags(),
eventType, currentContainer);
// Add it into the current scope.
if(currentContainer.IsNamespace())
{
Namespace space = (Namespace) currentContainer;
space.AddMember(eventVariable);
}
else if(currentContainer.IsClass() || currentContainer.IsStructure() || currentContainer.IsInterface())
{
Structure building = (Structure) currentContainer;
building.AddEvent(eventVariable);
}
else
Error(node, "an event cannot be defined here.");
// Set the event variable in the accessors.
node.SetEvent(eventVariable);
if(node.AddAccessor != null)
node.AddAccessor.SetEvent(eventVariable);
if(node.RemoveAccessor != null)
node.RemoveAccessor.SetEvent(eventVariable);
// Visit the accessors.
VisitList(node.GetAccessors());
// Declare simplified event.
if(node.GetAccessors() == null)
DeclareSimplifiedEvent(node);
return node;
}