KsqlParserErrorStrategy.java 文件源码

protected void reportNoViableAlternative(Parser recognizer, NoViableAltException e) {
  TokenStream tokens = recognizer.getInputStream();
  String input;
  if (tokens != null) {
    if (e.getStartToken().getType() == -1) {
      input = "<EOF>";
    } else {
      input = tokens.getText(e.getStartToken(), e.getOffendingToken());
    }
  } else {
    input = "<unknown input>";
  }

  String msg = "no viable alternative at input " + this.escapeWSAndQuote(input);
  recognizer.notifyErrorListeners(e.getOffendingToken(), msg, e);
}