DiagnosticErrorListener.java 文件源码

protected String getDecisionDescription(@NotNull Parser recognizer, @NotNull DFA dfa) {
    int decision = dfa.decision;
    int ruleIndex = dfa.atnStartState.ruleIndex;

    String[] ruleNames = recognizer.getRuleNames();
    if (ruleIndex < 0 || ruleIndex >= ruleNames.length) {
        return String.valueOf(decision);
    }

    String ruleName = ruleNames[ruleIndex];
    if (ruleName == null || ruleName.isEmpty()) {
        return String.valueOf(decision);
    }

    return String.format("%d (%s)", decision, ruleName);
}