private void RuleSpecsChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.OldStartingIndex > -1)
{
PatternNode <TData, TOffset> startNode = _pattern.Children.ElementAt(e.OldStartingIndex);
foreach (Pattern <TData, TOffset> node in startNode.GetNodes().Take(e.OldItems.Count).Cast <Pattern <TData, TOffset> >().ToArray())
{
_ruleIds.Remove(node.Name);
node.Remove();
}
}
if (e.NewStartingIndex > -1)
{
PatternNode <TData, TOffset> startNode = e.NewStartingIndex == 0 ? _pattern.Children.Begin : _pattern.Children.ElementAt(e.NewStartingIndex - 1);
foreach (IPatternRuleSpec <TData, TOffset> rs in e.NewItems)
{
IPatternRuleSpec <TData, TOffset> ruleSpec = rs;
string id = "rule" + _curRuleId++;
_ruleIds[id] = ruleSpec;
var subpattern = new Pattern <TData, TOffset>(id, ruleSpec.Pattern.Children.DeepClone())
{
Acceptable = match => ruleSpec.IsApplicable(match.Input) && ruleSpec.Pattern.Acceptable(match)
};
startNode.AddAfter(subpattern);
startNode = subpattern;
}
}
}
public IEnumerable <TData> Apply(TData input, TOffset start)
{
if (!_ruleSpec.IsApplicable(input) || input.Annotations.Count == 0)
{
return(Enumerable.Empty <TData>());
}
return(ApplyImpl(input, start));
}