/**
* 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);
}
}
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);
}