ANTLR打印无法识别字符的索引(在行中)

import org.antlr.v4.runtime.*;

public class CustomErrorListener extends BaseErrorListener {
    @Override
    public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine, String msg, RecognitionException e) {
        Token token = (Token) offendingSymbol;
        int index = token.getCharPositionInLine();
        System.out.println("无法识别字符的索引：" + index);
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建词法分析器
        CharStream input = CharStreams.fromString("your_input_string");
        YourLexer lexer = new YourLexer(input);

        // 创建语法分析器
        CommonTokenStream tokens = new CommonTokenStream(lexer);
        YourParser parser = new YourParser(tokens);

        // 设置自定义错误处理器
        parser.removeErrorListeners();
        parser.addErrorListener(new CustomErrorListener());

        // 执行语法分析
        parser.yourRule();
    }
}