CODEWITHSUNDEEP
javaantlr4
SharkJ
SharkJ

Reputation: 59

Antlr Main Class Error: MyListener cannot be resolved to a type

I have an antlr4 based project with a Main class containing this code:

package com.progur.langtutorial;

import java.io.FileInputStream;
import java.io.IOException;


import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;

public class Main {

    @SuppressWarnings("deprecation")
    public static void main(String[] args) {
        try {
            CharStream input = CharStreams.fromString("test");  

            GYOOLexer lexer = new GYOOLexer(input);
            GYOOParser parser = new GYOOParser(new CommonTokenStream(lexer));
            parser.addParseListener(new MyListener());

            // Start parsing
            parser.program(); 
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

However, I am having an error in parser.addParseListener(new MyListener()); where it says MyListener cannot be resolved to a type. What could that mean? In every tutorial I looked there was a random name for where 'MyListener()' is. What should be the correct statement for this?

Thanks!

Upvotes: 0

Views: 595

Answers (1)

sepp2k
sepp2k

Reputation: 370192

The listener that you pass to addParseListener should be a class that you defined yourself (and which implements the GYOOListener interface or extends the GYOOBaseListener abstract class generated by ANTLR). If you did not define a listener class, there's no reason to call addParseListener.

Upvotes: 1

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