TryCommonMark.java

import java.util.ArrayList;

import org.commonmark.node.*;
import org.commonmark.parser.Parser;
import org.commonmark.renderer.html.HtmlRenderer;

class URLVisitor extends AbstractVisitor {    
    int wordCount = 0;

    @Override
    public void visit(Text text) {
        // This is called for all Text nodes. Override other visit methods for other node types.

        // Count words (this is just an example, don't actually do it this way for various reasons).
        wordCount += text.getLiteral().split("\\W+").length;

        // Descend into children (could be omitted in this case because Text nodes don't have children).
        visitChildren(text);
    }
}

class URLVisitor2 extends AbstractVisitor {    
    int linkCount = 0;
    ArrayList<String> links; 

    @Override
    public void visit(Link text) {
        // This is called for all Text nodes. Override other visit methods for other node types.

        // Count words (this is just an example, don't actually do it this way for various reasons).
        //linkCount += text.getDestination().split("\\W+").length;
        links.add(text.getDestination());

        // Descend into children (could be omitted in this case because Text nodes don't have children).
        visitChildren(text);
    }
}

class TryCommonMark {
    public static void main(String[] args) {
        
        Parser parser = Parser.builder().build();
        Node document = parser.parse("This is *Sparta*");
        HtmlRenderer renderer = HtmlRenderer.builder().build();
        System.out.println(renderer.render(document));  // "<p>This is <em>Sparta</em></p>\n"
        
        Node node = parser.parse("Example\n=======\n\nSome more text");
        URLVisitor visitor = new URLVisitor();
        node.accept(visitor);
        //visitor.wordCount; 
        System.out.println(visitor.wordCount);
        
    }
} 


/**
 * # this part actually does the computation
Node node = parser.parse("Example\n=======\n\nSome more text");
WordCountVisitor visitor = new WordCountVisitor();
node.accept(visitor);
visitor.wordCount;  // 4

# this class can be defined anywhere in the file
class WordCountVisitor extends AbstractVisitor {
    int wordCount = 0;

    @Override
    public void visit(Text text) {
        // This is called for all Text nodes. Override other visit methods for other node types.

        // Count words (this is just an example, don't actually do it this way for various reasons).
        wordCount += text.getLiteral().split("\\W+").length;

        // Descend into children (could be omitted in this case because Text nodes don't have children).
        visitChildren(text);
    }
}

 */