/** Used by group creation routine, not by users */
internal Template(TemplateGroup group)
{
if (group == null)
throw new ArgumentNullException("group");
this.groupThatCreatedThisInstance = group;
if (group.TrackCreationEvents)
{
if (_debugState == null)
_debugState = new TemplateDebugState();
_debugState.NewTemplateEvent = new ConstructionEvent();
}
}
public virtual Template Add(string name, object value)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
if (name.IndexOf('.') >= 0)
{
throw new ArgumentException("cannot have '.' in attribute names");
}
if (Group.TrackCreationEvents)
{
if (_debugState == null)
{
_debugState = new TemplateDebugState();
}
_debugState.AddAttributeEvents.Add(name, new AddAttributeEvent(name, value));
}
FormalArgument arg = null;
if (impl.HasFormalArgs)
{
arg = impl.TryGetFormalArgument(name);
if (arg == null)
{
throw new ArgumentException("no such attribute: " + name);
}
}
else
{
// define and make room in locals (a hack to make new Template("simple template") work.)
arg = impl.TryGetFormalArgument(name);
if (arg == null)
{
// not defined
arg = new FormalArgument(name);
impl.AddArgument(arg);
if (locals == null)
{
locals = new object[1];
}
else
{
Array.Resize(ref locals, impl.FormalArguments.Count);
}
locals[arg.Index] = EmptyAttribute;
}
}
object curvalue = locals[arg.Index];
if (curvalue == EmptyAttribute)
{
// new attribute
locals[arg.Index] = value;
return(this);
}
// attribute will be multi-valued for sure now
// convert current attribute to list if not already
// copy-on-Write semantics; copy a list injected by user to Add new value
AttributeList multi = ConvertToAttributeList(curvalue);
locals[arg.Index] = multi; // replace with list
// now, Add incoming value to multi-valued attribute
IList list = value as IList;
if (list != null)
{
// flatten incoming list into existing list
multi.AddRange(list.Cast <object>());
}
else
{
multi.Add(value);
}
return(this);
}