public LookaheadSet LOOK(NFAState s) {
if (NFAToDFAConverter.debug) {
System.out.println("> LOOK(" + s + ")");
}
lookBusy.clear();
LookaheadSet look = _FIRST(s, true);
// FOLLOW makes no sense (at the moment!) for lexical rules.
if (grammar.type != Grammar.LEXER && look.member(Label.EOR_TOKEN_TYPE)) {
// avoid altering FIRST reset as it is cached
LookaheadSet f = FOLLOW(s.enclosingRule);
f.orInPlace(look);
f.remove(Label.EOR_TOKEN_TYPE);
look = f;
// look.orInPlace(FOLLOW(s.enclosingRule));
} else if (grammar.type == Grammar.LEXER && look.member(Label.EOT)) {
// if this has EOT, lookahead is all char (all char can follow rule)
// look = new LookaheadSet(Label.EOT);
look = new LookaheadSet(IntervalSet.COMPLETE_SET);
}
if (NFAToDFAConverter.debug) {
System.out.println("< LOOK(" + s + ")=" + look.toString(grammar));
}
return look;
}
