CapitulatingErrorStrategy.java 文件源码

@Override
protected void reportUnwantedToken(Parser recognizer) {
    // change error message from default implementation
    if (inErrorRecoveryMode(recognizer)) {
        return;
    }

    beginErrorCondition(recognizer);

    Token t = recognizer.getCurrentToken();
    String tokenName = getTokenErrorDisplay(t);
    String msg = "extraneous input " + tokenName + " expecting operator";
    recognizer.notifyErrorListeners(t, msg, null);
}