function parseCss(node, text) {
  let t = text.substring(node['start'], node['end'] - 1);
  node['parsedCssText'] = node['cssText'] = t.trim();
  if (node['parent']) {
    let ss = node['previous'] ? node['previous']['end'] : node['parent']['start'];
    t = text.substring(ss, node['start'] - 1);
    t = _expandUnicodeEscapes(t);
    t = t.replace(RX.multipleSpaces, ' ');
    // TODO(sorvell): ad hoc; make selector include only after last ;
    // helps with mixin syntax
    t = t.substring(t.lastIndexOf(';') + 1);
    let s = node['parsedSelector'] = node['selector'] = t.trim();
    node['atRule'] = (s.indexOf(AT_START) === 0);
    // note, support a subset of rule types...
    if (node['atRule']) {
      if (s.indexOf(MEDIA_START) === 0) {
        node['type'] = types.MEDIA_RULE;
      } else if (s.match(RX.keyframesRule)) {
        node['type'] = types.KEYFRAMES_RULE;
        node['keyframesName'] =
          node['selector'].split(RX.multipleSpaces).pop();
      }
    } else {
      if (s.indexOf(VAR_START) === 0) {
        node['type'] = types.MIXIN_RULE;
      } else {
        node['type'] = types.STYLE_RULE;
      }
    }
  }
  let r$ = node['rules'];
  if (r$) {
    for (let i = 0, l = r$.length, r;
      (i < l) && (r = r$[i]); i++) {
      parseCss(r, text);
    }
  }
  return node;
}
@param {StyleNode} node
@param {string} text
@return {StyleNode}