function overflowingAncestor()

in Documents/assets/smoothscroll/smooth-scroll.js [513:534]

• 22 lines of code
• 12 McCabe index (conditional complexity)

function overflowingAncestor(el) {
    var elems = [];
    var body = document.body;
    var rootScrollHeight = root.scrollHeight;
    do {
        var cached = cache[uniqueID(el)];
        if (cached) {
            return setCache(elems, cached);
        }
        elems.push(el);
        if (rootScrollHeight === el.scrollHeight) {
            var topOverflowsNotHidden = overflowNotHidden(root) && overflowNotHidden(body);
            var isOverflowCSS = topOverflowsNotHidden || overflowAutoOrScroll(root);
            if (isFrame && isContentOverflowing(root) ||
               !isFrame && isOverflowCSS) {
                return setCache(elems, getScrollRoot());
            }
        } else if (isContentOverflowing(el) && overflowAutoOrScroll(el)) {
            return setCache(elems, el);
        }
    } while (el = el.parentElement);
}