25 lines
684 B
JavaScript
25 lines
684 B
JavaScript
import {Selection} from "./index.js";
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export default function(compare) {
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if (!compare) compare = ascending;
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function compareNode(a, b) {
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return a && b ? compare(a.__data__, b.__data__) : !a - !b;
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}
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for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
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for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
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if (node = group[i]) {
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sortgroup[i] = node;
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}
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}
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sortgroup.sort(compareNode);
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}
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return new Selection(sortgroups, this._parents).order();
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}
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function ascending(a, b) {
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return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
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}
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