如何在 Antlr4 中的解析器给出的运行时收集错误

问题描述

我已从 Antlr 3 升级到 Antlr 4.我使用此代码来捕获使用此代码的异常.但这不适用于 Antlr 4.

I have upgraded from Antlr 3 to Antlr 4. I was using this code to catch exceptions using this code. But this is not working for Antlr 4.

partial class XParser
{
    public override void ReportError(RecognitionException e)
    {
        base.ReportError(e);
        Console.WriteLine("Error in Parser at line " + ":" + e.OffendingToken.Column + e.OffendingToken.Line + e.Message);
    }
}

这是出现的错误

'Parser.ReportError(Antlr4.Runtime.RecognitionException)': no suitable method found to override

在 Antlr 4 中，累积输入流中发生的错误的预期方式是什么.我无法在网上找到一种方法来实现这一目标.请给我一些指导.

In Antlr 4 what is the expected way of accumulating errors that occurs in the input stream. I was unable to find a way to achieve this on the net. Please provide me some guidelines.

我已经实现了 XParser 如下

I have implemented the XParser as below

partial class XParser : IAntlrErrorListener<IToken>
{
    public void SyntaxError(IRecognizer recognizer, IToken offendingSymbol, int line, int charPositionInLine, string msg, RecognitionException e)
    {
        Console.WriteLine("Error in parser at line " + ":" + e.OffendingToken.Column + e.OffendingToken.Line + e.Message);
    }
}

正如你所说，我可以使用任何提到的类来扩展这个解析器类.但是我无法注册这个监听器，在主程序中我对将参数作为 listener 传递感到困惑.请帮我注册.

As you said I can extend this parser class using any of the mentioned classes. But I was unable to register this listener, in the main program I am confused with passing argument as the listener. Please help me with the registering.

正如我所看到的，这些类能够产生更有意义的错误消息，不是吗?

As I can see these classes has the capability of producing more meaningful error messages don't they?

推荐答案

你需要实现 IAntlrErrorListener.如果您只想像上面那样报告错误，那么您应该关注 SyntaxError 方法.如果您想扩展一个基类，可以使用多个基类.

You need to implement IAntlrErrorListener<IToken>. If all you want to is report errors like you have above, then you should focus on the SyntaxError method. Several base classes are available if you want to extend one.

• ConsoleErrorListener
• BaseErrorListener
• DiagnosticErrorListener

错误监听器通过调用parser.AddErrorListener(listener)附加到解析器实例.

The error listener is attached to the parser instance by calling parser.AddErrorListener(listener).

您需要创建一个实现错误侦听器接口的新类.然后将侦听器附加到解析器.解析器本身不会实现错误监听器接口.

You need to create a new class which implements the error listener interface. You then attach the listener to the parser. The parser itself will not implement the error listener interface.

这篇关于如何在 Antlr4 中的解析器给出的运行时收集错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！