private TResult DoVisit<TResult, TContext>(TContext context, Delegate visitor)
where TResult : Value, new()
{
ValueVisitorDelegate<TResult> contextFreeVisit = (visitor as ValueVisitorDelegate<TResult>);
ValueVisitorDelegate<TResult, TContext> contextBoundVisit = (visitor as ValueVisitorDelegate<TResult, TContext>);
IList<Value> newContent = new List<Value>();
if (visitor != null)
{
TResult changed = ((contextBoundVisit != null) ? contextBoundVisit(context, this, contextBoundVisit) : contextFreeVisit(this, contextFreeVisit));
if (changed != this)
return changed;
foreach (Value value in Content)
{
TResult replaced = ((contextBoundVisit != null) ? value.Visit<TResult, TContext>(context, contextBoundVisit) : value.Visit<TResult>(contextFreeVisit));
if (replaced != null)
newContent.Add(replaced);
}
}
if (newContent.Count > 0)
content = newContent.ToArray();
return (this as TResult);
}
public TResult Visit<TResult, TContext>(TContext context, ValueVisitorDelegate<TResult, TContext> visitor)
where TResult : Value, new()
{
return ContextBoundVisit<TResult, TContext>(context, visitor);
}
public TResult Visit<TResult>(ValueVisitorDelegate<TResult> visitor)
where TResult : Value, new()
{
return ContextFreeVisit<TResult>(visitor);
}
public Value Visit<TContext>(TContext context, ValueVisitorDelegate<Value, TContext> visitor)
{
return Visit<Value, TContext>(context, visitor);
}
public Value Visit(object context, ValueVisitorDelegate<Value, object> visitor)
{
return Visit<object>(context, visitor);
}
public Value Visit(ValueVisitorDelegate<Value> visitor)
{
return Visit<Value>(visitor);
}
private TResult ContextFreeVisit<TResult>(ValueVisitorDelegate<TResult> visitor)
where TResult : Value, new()
{
return DoVisit<TResult, object>(null, visitor);
}
