stream.replace = function (s, fn) {
return stream.select(s, function (node) {
if (typeof fn === 'function') {
node.replace(function (html) { return fn(html, node); });
}
else node.replace(fn);
});
};
stream.remove = function (s, fn) {
return stream.select(s, function (node) {
node.remove();
if (typeof fn === 'function') fn(node);
});
};