Esempio n. 1
0
  /**
   * Carries out preprocessing that makes JEuclid handle the document better.
   *
   * @param doc Document
   */
  static void preprocessForJEuclid(Document doc) {
    // underbrace and overbrace
    NodeList list = doc.getElementsByTagName("mo");
    for (int i = 0; i < list.getLength(); i++) {
      Element mo = (Element) list.item(i);
      String parentName = ((Element) mo.getParentNode()).getTagName();
      if (parentName == null) {
        continue;
      }
      if (parentName.equals("munder") && isTextChild(mo, "\ufe38")) {
        mo.setAttribute("stretchy", "true");
        mo.removeChild(mo.getFirstChild());
        mo.appendChild(doc.createTextNode("\u23df"));
      } else if (parentName.equals("mover") && isTextChild(mo, "\ufe37")) {
        mo.setAttribute("stretchy", "true");
        mo.removeChild(mo.getFirstChild());
        mo.appendChild(doc.createTextNode("\u23de"));
      }
    }

    // menclose for long division doesn't allow enough top padding. Oh, and
    // <mpadded> isn't implemented. And there isn't enough padding to left of
    // the bar either. Solve by adding an <mover> with just an <mspace> over#
    // the longdiv, contained within an mrow that adds a <mspace> before it.
    list = doc.getElementsByTagName("menclose");
    for (int i = 0; i < list.getLength(); i++) {
      Element menclose = (Element) list.item(i);
      // Only for longdiv
      if (!"longdiv".equals(menclose.getAttribute("notation"))) {
        continue;
      }
      Element mrow = doc.createElementNS(WebMathsService.NS, "mrow");
      Element mover = doc.createElementNS(WebMathsService.NS, "mover");
      Element mspace = doc.createElementNS(WebMathsService.NS, "mspace");
      Element mspaceW = doc.createElementNS(WebMathsService.NS, "mspace");
      boolean previousElement = false;
      for (Node previous = menclose.getPreviousSibling();
          previous != null;
          previous = previous.getPreviousSibling()) {
        if (previous.getNodeType() == Node.ELEMENT_NODE) {
          previousElement = true;
          break;
        }
      }
      if (previousElement) {
        mspaceW.setAttribute("width", "4px");
      }
      menclose.getParentNode().insertBefore(mrow, menclose);
      menclose.getParentNode().removeChild(menclose);
      mrow.appendChild(mspaceW);
      mrow.appendChild(mover);
      mover.appendChild(menclose);
      mover.appendChild(mspace);
    }
  }
Esempio n. 2
0
 private static boolean isTextChild(Node parent, String text) {
   NodeList list = parent.getChildNodes();
   if (list.getLength() != 1) {
     return false;
   }
   Node child = list.item(0);
   if (child.getNodeType() != Node.TEXT_NODE) {
     return false;
   }
   return child.getNodeValue().equals(text);
 }