class Rule34Ripper extends AbstractHTMLRipper {

    public Rule34Ripper(URL url) throws IOException {
        super(url);
    }

    private String apiUrl;
    private int pageNumber = 0;

    @Override
    public String getHost() {
        return "rule34";
    }

    @Override
    public String getDomain() {
        return "rule34.xxx";
    }

    @Override
    public boolean canRip(URL url){
        Pattern p = Pattern.compile("https?://rule34.xxx/index.php\\?page=post&s=list&tags=([\\S]+)");
        Matcher m = p.matcher(url.toExternalForm());
        return m.matches();
    }

    @Override
    public String getGID(URL url) throws MalformedURLException {
        Pattern p = Pattern.compile("https?://rule34.xxx/index.php\\?page=post&s=list&tags=([\\S]+)");
        Matcher m = p.matcher(url.toExternalForm());
        if (m.matches()) {
            return m.group(1);
        }
        throw new MalformedURLException("Expected rule34.xxx URL format: " +
                "rule34.xxx/index.php?page=post&s=list&tags=TAG - got " + url + " instead");
    }

    public URL getAPIUrl() throws MalformedURLException {
        URL urlToReturn = new URL("https://rule34.xxx/index.php?page=dapi&s=post&q=index&limit=100&tags=" + getGID(url));
        return urlToReturn;
    }

    @Override
    public Document getFirstPage() throws IOException {
        apiUrl = getAPIUrl().toExternalForm();
        // "url" is an instance field of the superclass
        return Http.url(getAPIUrl()).get();
    }

    @Override
    public Document getNextPage(Document doc) throws IOException {<FILL_FUNCTION_BODY>}

    @Override
    public List<String> getURLsFromPage(Document doc) {
        List<String> result = new ArrayList<>();
        for (Element el : doc.select("posts > post")) {
            String imageSource = el.select("post").attr("file_url");
            result.add(imageSource);

        }
        return result;
    }

    @Override
    public void downloadURL(URL url, int index) {
        addURLToDownload(url, getPrefix(index));
    }
}

        if (doc.html().contains("Search error: API limited due to abuse")) {
            throw new IOException("No more pages");
        }
        pageNumber += 1;
        String nextPage = apiUrl + "&pid=" + pageNumber;
        return Http.url(nextPage).get();
    
<methods>public boolean addURLToDownload(java.net.URL, java.io.File, java.lang.String, Map<java.lang.String,java.lang.String>, java.lang.Boolean) ,public boolean addURLToDownload(java.net.URL, java.io.File) ,public boolean canRip(java.net.URL) ,public void downloadCompleted(java.net.URL, java.io.File) ,public void downloadErrored(java.net.URL, java.lang.String) ,public void downloadExists(java.net.URL, java.io.File) ,public int getCompletionPercentage() ,public int getCount() ,public abstract java.lang.String getHost() ,public Document getNextPage(Document) throws java.io.IOException,public java.lang.String getStatusText() ,public void rip() throws java.io.IOException,public java.net.URL sanitizeURL(java.net.URL) throws java.net.MalformedURLException,public boolean saveText(java.net.URL, java.lang.String, java.lang.String, int) ,public void setWorkingDir(java.net.URL) throws java.io.IOException<variables>private Map<java.net.URL,java.io.File> itemsCompleted,private Map<java.net.URL,java.lang.String> itemsErrored,private Map<java.net.URL,java.io.File> itemsPending