private void EarleyComplete(CompletedState completed, int location)
{
var originSet = Chart[completed.Origin];
// Predictions may grow
var p = 0;
for (; p < originSet.NonterminalStates.Count; ++p)
{
var nonterminal = originSet.NonterminalStates[p];
if (!nonterminal.IsSource(completed.Head))
{
continue;
}
var dottedRule = nonterminal.DottedRule.Next;
var origin = nonterminal.Origin;
if (Chart.Contains(location, dottedRule, origin))
{
continue;
}
var nextState = EarleyItems.NewState(dottedRule, origin);
if (Chart.Add(location, nextState))
{
Log(compName, location, nextState);
}
}
}
private void Initialize()
{
foreach (var startProduction in Grammar.ProductionsForStart())
{
var startState = EarleyItems.NewState(startProduction, 0, 0);
if (Chart.Add(0, startState))
{
Log(startName, 0, startState);
}
}
ReductionPass();
}
private void PredictProduction(int location, Production production)
{
var dottedRule = DottedRules.Get(production, 0);
if (Chart.Contains(location, dottedRule, 0))
{
return;
}
var predictedState = EarleyItems.NewState(dottedRule, location);
if (Chart.Add(location, predictedState))
{
Log(predName, location, predictedState);
}
}
private void PredictAycockHorspool(NonterminalState evidence, int location)
{
var dottedRule = evidence.DottedRule.Next;
if (Chart.Contains(location, dottedRule, evidence.Origin))
{
return;
}
var aycockHorspoolState = EarleyItems.NewState(dottedRule, evidence.Origin);
if (Chart.Add(location, aycockHorspoolState))
{
Log(predName, location, aycockHorspoolState);
}
}
private void Scan(TerminalState terminal, IToken token)
{
var currentSymbol = terminal.DottedRule.PostDot as Terminal;
if (token.IsFrom(currentSymbol))
{
var dottedRule = terminal.DottedRule.Next;
if (Chart.Contains(Location + 1, dottedRule, terminal.Origin))
{
return;
}
var nextState = EarleyItems.NewState(dottedRule, terminal.Origin);
if (Chart.Add(Location + 1, nextState))
{
LogScan(Location + 1, nextState, token);
}
}
}
