private void addStyledText(String text, Style style) {
   try {
     doc.insertString(doc.getLength(), text, style);
   } catch (BadLocationException ble) {
     ble.printStackTrace();
   }
 }
 private void initializeStyles() {
   errorStyle =
       doc.addStyle(
           "errorStyle",
           StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE));
   errorStyleRed = doc.addStyle("errorStyleRed", errorStyle);
   StyleConstants.setForeground(errorStyleRed, Color.RED);
   errorStyleMono = doc.addStyle("errorStyleMono", errorStyle);
   StyleConstants.setFontFamily(errorStyleMono, "Monospaced");
 }
 @Override
 public void mouseClicked(MouseEvent me) {
   Element el = doc.getCharacterElement(viewToModel(me.getPoint()));
   if (el == null) return;
   AttributeSet as = el.getAttributes();
   if (as.isDefined("ip")) {
     String ip = (String) as.getAttribute("ip");
     ScriptException se = (ScriptException) as.getAttribute("exception");
     Node node = net.getAtIP(ip);
     if (node == null) {
       Utility.displayError("Error", "Computer does not exist");
       return;
     }
     String errorString =
         "--ERROR--\n"
             + "Error at line number "
             + se.getLineNumber()
             + " and column number "
             + se.getColumnNumber()
             + "\n"
             + se.getMessage();
     new ScriptDialog(
             parentFrame,
             str -> {
               if (str != null) {
                 node.setScript(str);
               }
             },
             node.getScript(),
             errorString)
         .setVisible(true);
   }
 }
 @Override
 public void mouseMoved(MouseEvent me) {
   Element el = doc.getCharacterElement(viewToModel(me.getPoint()));
   if (el == null) return;
   AttributeSet as = el.getAttributes();
   if (as.isDefined("ip")) {
     setCursor(handCursor);
   } else {
     setCursor(defaultCursor);
   }
 }