public virtual IntervalSet NextTokens(ATNState s, RuleContext ctx)
{
LL1Analyzer anal = new LL1Analyzer(this);
IntervalSet next = anal.Look(s, ctx);
return(next);
}
public virtual IntervalSet NextTokens(ATNState s, PredictionContext ctx)
{
Args.NotNull("ctx", ctx);
LL1Analyzer anal = new LL1Analyzer(this);
IntervalSet next = anal.Look(s, ctx);
return(next);
}
protected virtual void ProcessLexer()
{
// make sure all non-fragment lexer rules must match at least one symbol
foreach (Rule rule in g.rules.Values)
{
if (rule.IsFragment())
{
continue;
}
LL1Analyzer analyzer = new LL1Analyzer(g.atn);
IntervalSet look = analyzer.Look(g.atn.ruleToStartState[rule.index], PredictionContext.EmptyLocal);
if (look.Contains(TokenConstants.Epsilon))
{
g.tool.errMgr.GrammarError(ErrorType.EPSILON_TOKEN, g.fileName, ((GrammarAST)rule.ast.GetChild(0)).Token, rule.name);
}
}
}
protected virtual void ProcessParser()
{
g.decisionLOOK = new List<IntervalSet[]>(g.atn.NumberOfDecisions + 1);
foreach (DecisionState s in g.atn.decisionToState)
{
g.tool.Log("LL1", "\nDECISION " + s.decision + " in rule " + g.GetRule(s.ruleIndex).name);
IntervalSet[] look;
if (s.nonGreedy)
{ // nongreedy decisions can't be LL(1)
look = new IntervalSet[s.NumberOfTransitions + 1];
}
else
{
LL1Analyzer anal = new LL1Analyzer(g.atn);
look = anal.GetDecisionLookahead(s);
g.tool.Log("LL1", "look=[" + string.Join(", ", look.AsEnumerable()) + "]");
}
Debug.Assert(s.decision + 1 >= g.decisionLOOK.Count);
Utils.SetSize(g.decisionLOOK, s.decision + 1);
g.decisionLOOK[s.decision] = look;
g.tool.Log("LL1", "LL(1)? " + Disjoint(look));
}
}
public virtual IntervalSet NextTokens(ATNState s, PredictionContext ctx)
{
Args.NotNull("ctx", ctx);
LL1Analyzer anal = new LL1Analyzer(this);
IntervalSet next = anal.Look(s, ctx);
return next;
}
