simmerjs/lib/stackHierarchy.js

A pure Javascript reverse CSS selector engine which calculates a DOM element's unique CSS selector on the current page.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = stackHierarchy;
function push(arr, val) {
  arr.push(val);
  return arr;
}

function tail(arr) {
  return arr[arr.length - 1];
}
/**
 * Retireve the element's ancestors up to the configured level.
 * This is an internal function and is not to be used from the outside (nor can it, it is private)
 * @param element (Object) The elemen't whose ancestry we want to retrieve
 * @param depth (number) How deep to into the heirarchy to collect elements
 */
function stackHierarchy(element, depth) {
  if (depth <= 0) {
    throw new Error("Simmer: An invalid depth of " + depth + " has been specified");
  }
  return Array(depth - 1).fill().reduce(function (acc, val) {
    return tail(acc).parent() ? push(acc, tail(acc).parent()) : acc;
  }, [element]);
}