index.js

/**
 * dependencies
 */

var matches = require('matches-selector');

/**
 * Traverse with the given `el`, `selector` and `len`.
 *
 * @param {String} type
 * @param {Element} el
 * @param {String|Element} selector
 * @param {Number} len
 * @return {Array}
 * @api public
 */

module.exports = function(type, el, selector, len){
  var el = el[type]
    , n = len || 1
    , ret = [];

  if (!el) return ret;

  // check if `selector` is a DOM node
  var isElement = selector && selector.nodeName;

  do {
    if (n == ret.length) break;
    if (1 != el.nodeType) continue;
    if (isElement) el == selector && ret.push(el);
    else if (matches(el, selector)) ret.push(el);
    if (!selector) ret.push(el);
  } while (el = el[type]);

  return ret;
}