向antlr4中的Lexer / Parser文件添加自定义异常的正确方法

Question

I have a custom ParsingException(String message, int location, String offendingText)

I want my parser to throw this exception when a parsing / lexing error is encountered.

Is this correct ?

@parser::members
{
  @Override
  public void notifyErrorListeners(Token offendingToken, String msg, RecognitionException ex)
  {
  throw new ParsingException(msg,offendingToken.getStartIndex(),offendingToken.getText());
  }
}
@lexer::members {
    @Override
    public void recover(RecognitionException ex)
    {
 throw new ParsingException(ex.getMessage(),getCharPositionInLine(),ex.getOffendingToken().getText());
        }
          }

I get an UnhandledException error with this.

Answer 1

您应该重写syntaxError的BaseErrorListener syntaxError方法而不是notifyErrorListeners并按照此处syntaxError方法进行recover ： 处理ANTLR4中的错误 。