private void CollapseAlternatives(Entity entity)
{
// we're only interested in Entities whose Properties belong to one
// Alternatives consuming action
List <ParseAction> actions =
entity.Properties.Select(prop => prop.Source.Parent).Distinct().ToList();
// this should be ONLY 1 and it must BE CONSUMEANY
if (actions.Count != 1 || !(actions.First() is ConsumeAny))
{
return;
}
// all properties should be Consuming Entities
if (entity.Properties.Where(p => p.Source is ConsumeEntity).ToList().Count() != entity.Properties.Count)
{
return;
}
this.Log("collapsing alternatives on " + entity.Name);
ConsumeAny consume = (ConsumeAny)actions.First();
// create a new Property to hold the outcome of the consumption
PropertyProxy property = new PropertyProxy()
{
Name = "alternative",
Source = consume
};
// add the new Property as the target of the action
consume.Property = property;
// make all original consumers point to the new alternative property
// this is the case for all existing properties
foreach (Property prop in entity.Properties)
{
prop.Source.Property = property;
property.Proxied.Add(prop);
this.Log(" - " + prop.Type);
}
// now remove all old Properies
entity.Clear();
// add the new property to the Entity
entity.Add(property);
}
private ParseAction ImportAlternativesExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
AlternativesExpression alternative = ((AlternativesExpression)exp);
ConsumeAny consume = new ConsumeAny()
{
Parent = parent
};
// AlternativesExpression is constructed recusively, unroll it...
while (true)
{
// add first part
consume.Actions.Add(this.ImportPropertiesAndParseActions(
alternative.NonAlternativesExpression, entity, consume, optional
));
// add remaining parts
if (alternative.Expression is NonAlternativesExpression)
{
// last part
consume.Actions.Add(this.ImportPropertiesAndParseActions(
alternative.Expression, entity, consume, optional
));
break;
}
else
{
// recurse
alternative =
(AlternativesExpression)alternative.Expression;
}
}
return(consume);
}
