ParserErrorStrategy.java 文件源码

@Override
public void recover(final Parser recognizer, final RecognitionException re) {
    final Token token = re.getOffendingToken();
    String message;

    if (token == null) {
        message = "no parse token found.";
    } else if (re instanceof InputMismatchException) {
        message = "unexpected token [" + getTokenErrorDisplay(token) + "]" +
                " was expecting one of [" + re.getExpectedTokens().toString(recognizer.getVocabulary()) + "].";
    } else if (re instanceof NoViableAltException) {
        if (token.getType() == PainlessParser.EOF) {
            message = "unexpected end of script.";
        } else {
            message = "invalid sequence of tokens near [" + getTokenErrorDisplay(token) + "].";
        }
    } else {
        message =  "unexpected token near [" + getTokenErrorDisplay(token) + "].";
    }

    Location location = new Location(sourceName, token == null ? -1 : token.getStartIndex());
    throw location.createError(new IllegalArgumentException(message, re));
}