public void EnterEveryRule(ParserRuleContext ctx)
{
string ruleName = ruleNames[ctx.RuleIndex];
IList <TerminalNode> tnodes = getDirectTerminalChildren(ctx);
// Find all ordered unique pairs of literals;
// no (a,a) pairs and only literals like '{', 'begin', '}', ...
// Add a for (a,a) into ruleToRepeatedTokensSet for later filtering
RuleAltKey ruleAltKey = new RuleAltKey(ruleName, ctx.getAltNumber());
for (int i = 0; i < tnodes.Count; i++)
{
for (int j = i + 1; j < tnodes.Count; j++)
{
TerminalNode a = tnodes[i];
TerminalNode b = tnodes[j];
int atype = a.Symbol.Type;
int btype = b.Symbol.Type;
// KED: THIS CODE DOES NOT WORK WITH GRAMMARS CONTAINING FRAGMENTS.
// IN ANTLRV4LEXER.G4 THAT IS IN THIS DIRECTORY, THE GRAMMAR DOES NOT USE
// FRAGMENT FOR COLON. BUT THE G4 GRAMMAR IN THE ANTLR GRAMMARS-G4 EXAMPLES,
// IT DOES. CONSEQUENTLY, GETLITERALNAME RETURNS NULL!
// FRAGMENTS AREN'T PART OF THE VOCABULARY, SO THIS CODE DOES NOT WORK!!
// only include literals like '{' and ':' not IDENTIFIER etc...
if (vocab.GetLiteralName(atype) == null || vocab.GetLiteralName(btype) == null)
{
continue;
}
if (atype == btype)
{
ISet <int> repeatedTokensSet = null;
if (!ruleToRepeatedTokensSet.TryGetValue(ruleAltKey, out repeatedTokensSet))
{
repeatedTokensSet = new HashSet <int>();
ruleToRepeatedTokensSet[ruleAltKey] = repeatedTokensSet;
}
repeatedTokensSet.Add(atype);
}
else
{
org.antlr.codebuff.misc.Pair <int, int> pair = new org.antlr.codebuff.misc.Pair <int, int>(atype, btype);
ISet <org.antlr.codebuff.misc.Pair <int, int> > pairsBag = null;
if (!ruleToPairsBag.TryGetValue(ruleAltKey, out pairsBag))
{
pairsBag = new HashSet <org.antlr.codebuff.misc.Pair <int, int> >();
ruleToPairsBag[ruleAltKey] = pairsBag;
}
pairsBag.Add(pair);
}
}
}
}
