internal ActiveLabel(GrammarSequence sequence, int index = 0)
{
_sequence = sequence;
_index = index;
var sequenceTerms = sequence.Terms;
CurrentTerm = sequenceTerms.Skip(index).First();
WillComplete = sequenceTerms.Count() == index + 1;
var currentTerminal = CurrentTerm as Terminal;
if (currentTerminal != null)
{
TerminalLabel = new TerminalLabel(currentTerminal, sequence);
}
if (WillComplete)
{
CompleteLabel = new CompleteLabel(_sequence);
}
else
{
NextInChain = new ActiveLabel(sequence, index + 1);
}
}
internal CompleteEdge(ActiveEdge extendedEdge, CompleteEdge extendingEdge)
: base(extendedEdge.StartContext, extendingEdge.EndContext)
{
CompleteLabel = extendedEdge.Label.CompleteLabel;
Parent = CompleteLabel.Parent;
ExtendedEdge = extendedEdge;
ExtendingEdge = extendingEdge;
}
protected CompleteEdge(TerminalLabel terminalLabel, SourceContext startContext, SourceContext endContext)
: base(startContext, endContext)
{
Parent = terminalLabel.Terminal;
CompleteLabel = terminalLabel;
}
