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/**
* Given a DOM subtree, wraps it in a list, and puts each line into its own
* list item.
*
* @param {Node} node modified in place. Its content is pulled into an
* HTMLOListElement, and each line is moved into a separate list item.
* This requires cloning elements, so the input might not have unique
* IDs after numbering.
* @param {boolean} isPreformatted true iff white-space in text nodes should
* be treated as significant.
*/
function numberLines(node, opt_startLineNum, isPreformatted) {
var nocode = /(?:^|\s)nocode(?:\s|$)/;
var lineBreak = /\r\n?|\n/;
var document = node.ownerDocument;
var li = document.createElement('li');
while (node.firstChild) {
li.appendChild(node.firstChild);
}
// An array of lines. We split below, so this is initialized to one
// un-split line.
var listItems = [li];
function walk(node) {
var type = node.nodeType;
if (type == 1 && !nocode.test(node.className)) { // Element
if ('br' === node.nodeName) {
breakAfter(node);
// Discard the <BR> since it is now flush against a </LI>.
if (node.parentNode) {
node.parentNode.removeChild(node);
}
} else {
for (var child = node.firstChild; child; child = child.nextSibling) {
walk(child);
}
}
} else if ((type == 3 || type == 4) && isPreformatted) { // Text
var text = node.nodeValue;
var match = text.match(lineBreak);
if (match) {
var firstLine = text.substring(0, match.index);
node.nodeValue = firstLine;
var tail = text.substring(match.index + match[0].length);
if (tail) {
var parent = node.parentNode;
parent.insertBefore(
document.createTextNode(tail), node.nextSibling);
}
breakAfter(node);
if (!firstLine) {
// Don't leave blank text nodes in the DOM.
node.parentNode.removeChild(node);
}
}
}
}
// Split a line after the given node.
function breakAfter(lineEndNode) {
// If there's nothing to the right, then we can skip ending the line
// here, and move root-wards since splitting just before an end-tag
// would require us to create a bunch of empty copies.
while (!lineEndNode.nextSibling) {
lineEndNode = lineEndNode.parentNode;
if (!lineEndNode) { return; }
}
function breakLeftOf(limit, copy) {
// Clone shallowly if this node needs to be on both sides of the break.
var rightSide = copy ? limit.cloneNode(false) : limit;
var parent = limit.parentNode;
if (parent) {
// We clone the parent chain.
// This helps us resurrect important styling elements that cross lines.
// E.g. in <i>Foo<br>Bar</i>
// should be rewritten to <li><i>Foo</i></li><li><i>Bar</i></li>.
var parentClone = breakLeftOf(parent, 1);
// Move the clone and everything to the right of the original
// onto the cloned parent.
var next = limit.nextSibling;
parentClone.appendChild(rightSide);
for (var sibling = next; sibling; sibling = next) {
next = sibling.nextSibling;
parentClone.appendChild(sibling);
}
}
return rightSide;
}
var copiedListItem = breakLeftOf(lineEndNode.nextSibling, 0);
// Walk the parent chain until we reach an unattached LI.
for (var parent;
// Check nodeType since IE invents document fragments.
(parent = copiedListItem.parentNode) && parent.nodeType === 1;) {
copiedListItem = parent;
}
// Put it on the list of lines for later processing.
listItems.push(copiedListItem);
}
// Split lines while there are lines left to split.
for (var i = 0; // Number of lines that have been split so far.
i < listItems.length; // length updated by breakAfter calls.
++i) {
walk(listItems[i]);
}
// Make sure numeric indices show correctly.
if (opt_startLineNum === (opt_startLineNum|0)) {
listItems[0].setAttribute('value', opt_startLineNum);
}
var ol = document.createElement('ol');
ol.className = 'linenums';
var offset = Math.max(0, ((opt_startLineNum - 1 /* zero index */)) | 0) || 0;
for (var i = 0, n = listItems.length; i < n; ++i) {
li = listItems[i];
// Stick a class on the LIs so that stylesheets can
// color odd/even rows, or any other row pattern that
// is co-prime with 10.
li.className = 'L' + ((i + offset) % 10);
if (!li.firstChild) {
li.appendChild(document.createTextNode('\xA0'));
}
ol.appendChild(li);
}
node.appendChild(ol);
}
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