/// <summary>
/// Eliminate unit rules (e.g., <X> -> <Y>)
/// </summary>
/// <param name="productions"></param>
private void StepUnit(ISet <Production> productions)
{
// TODO: maybe we shouldn't allow self loops?
RemoveSelfLoops(productions);
var toRemove = BaseGrammar.RemoveDuplicatesHelper(productions);
foreach (var production in toRemove)
{
productions.Remove(production);
}
var finalProductions = RemoveUnits(productions);
productions.Clear();
productions.UnionWith(finalProductions);
}
protected void RemoveDuplicates()
{
var toRemove = BaseGrammar.RemoveDuplicatesHelper(this.Productions);
this.RemoveProductionsWithoutSimplifying(toRemove);
}