protected override IEnumerable <ParseStep> GetFailParseSteps(IRegexEngine engine, State initialState, State currentState, bool skipAdvance)
{
yield return(ParseStep.Fail(this, initialState, currentState));
if (!skipAdvance)
{
engine.State = initialState.Advance();
yield return(ParseStep.AdvanceIndex(this, engine.State));
}
}
protected override IEnumerable <ParseStep> GetSuccessParseStep(IRegexEngine engine, State initialState)
{
var matchedText = engine.Input.Substring(initialState.Index, engine.State.Index - initialState.Index);
IList <IList <ParenCapture> > captureSet = new List <IList <ParenCapture> >();
foreach (CapturingParens capturingParen in Children.FindBy(node => node is CapturingParens))
{
var captures = engine.GetCaptures(capturingParen.Number);
captureSet.Add(new ReadOnlyCollection <ParenCapture>(captures.ToList()));
engine.PopCapture(capturingParen.Number);
}
yield return(ParseStep.Match(this, initialState, matchedText, new ReadOnlyCollection <IList <ParenCapture> >(captureSet)));
if (initialState.Index == engine.State.Index)
{
// If we had a successful match, and the engine didn't move, we need to move it ourselves now.
engine.State = engine.State.Advance();
yield return(ParseStep.AdvanceIndex(this, engine.State));
}
yield return(ParseStep.BeginParse(this, engine.State));
}
