1 d3_selectionPrototype.selectAll = function(selector) {

     2   var subgroups = [],

     3       subgroup,

     4       node;

     5 

     6   if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);

     7 

     8   for (var j = -1, m = this.length; ++j < m;) {

     9     for (var group = this[j], i = -1, n = group.length; ++i < n;) {

    10       if (node = group[i]) {

    11         subgroups.push(subgroup = d3_array(selector.call(node, node.__data__, i)));

    12         subgroup.parentNode = node;

    13       }

    14     }

    15   }

    16 

    17   return d3_selection(subgroups);

    18 };

    19 

    20 function d3_selection_selectorAll(selector) {

    21   return function() {

    22     return d3_selectAll(selector, this);

    23   };

    24 }