setXpathListener-JoeSimmons

function iterOver(xp) {

    var i, item;

    for(i = 0; (item = xp.snapshotItem(i)); i++) {

        item.removeAttribute("data-hovercard");

    }

}

function setXpathListener(expr, func, context, onTimer) {

    var i, xp, arg, len, _int,
        _expr = (typeof expr === "string" ? expr : null),
        _func = (typeof func === "function" ? func : null),
        _context = (typeof context === "object" && context.nodeType === 1 ? context : document),
        _onTimer = (typeof onTimer === "boolean" ? onTimer : false);

    if(_onTimer === false) {

        for(i = 0; (arg = arguments[i]); i++) {

            switch(typeof arg) {

                case "boolean":
                    if(!_onTimer && arg === true) _onTimer = true;
                    break;

                case "function":
                    if(!_func) _func = arg;
                    break;

                case "string":
                    if(!_expr) _expr = arg;
                    break;

                case "object":
                    if(!_context && arg.nodeType === 1) _context = arg;
                    break;

            }

        }

    }

    if(typeof _expr !== "string" || typeof _func !== "function") return;

    xp = document.evaluate(_expr, _context, null, 6, null);
    len = xp.snapshotLength;

    if(len > 50) _int = 1750;
        else if(len > 25) _int = 1500;
        else if(len > 15) _int = 1250;
        else if(len > 5) _int = 1000;
        else if(len <= 5 && len !== 0) _int = 750;
        else if(len === 0) _int = 500;

    document.title = "int:  " + _int + " - matches: " + len + " (" + Math.floor(Math.random() * 999) + ")";

    _func(xp); // run the user-specified function

    window.setTimeout(function() { // run this function again after some odd amount of time

        setXpathListener(_expr, _func, _context, true);

    }, _int);

}


var expr = "//a[@data-hovercard]/img/..";

1 && setXpathListener(expr, iterOver);