GoParserFactory.java 文件源码

public static SemanticContext.Predicate getQidPredicate(@NonNull ATN atn) {
    int predicateIndex = -1;
    for (ATNState state : atn.states) {
        if (state.ruleIndex != GoParser.RULE_qualifiedIdentifier) {
            continue;
        }

        for (int i = 0; i < state.getNumberOfOptimizedTransitions(); i++) {
            Transition transition = state.getOptimizedTransition(i);
            if (transition instanceof PredicateTransition) {
                predicateIndex = ((PredicateTransition)transition).predIndex;
            }
        }
    }

    assert predicateIndex >= 0 : "Couldn't find the QID predicate transition.";
    return new SemanticContext.Predicate(GoParser.RULE_qualifiedIdentifier, predicateIndex, false);
}