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Viewing file:     composite-key.js (1.52 KB)      -rw-r--r--

// TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
require('../modules/es.map');
require('../modules/es.weak-map');
var getBuiltIn = require('../internals/get-built-in');
var create = require('../internals/object-create');
var isObject = require('../internals/is-object');

var $Object = Object;
var $TypeError = TypeError;
var Map = getBuiltIn('Map');
var WeakMap = getBuiltIn('WeakMap');

var Node = function () {
  // keys
  this.object = null;
  this.symbol = null;
  // child nodes
  this.primitives = null;
  this.objectsByIndex = create(null);
};

Node.prototype.get = function (key, initializer) {
  return this[key] || (this[key] = initializer());
};

Node.prototype.next = function (i, it, IS_OBJECT) {
  var store = IS_OBJECT
    ? this.objectsByIndex[i] || (this.objectsByIndex[i] = new WeakMap())
    : this.primitives || (this.primitives = new Map());
  var entry = store.get(it);
  if (!entry) store.set(it, entry = new Node());
  return entry;
};

var root = new Node();

module.exports = function () {
  var active = root;
  var length = arguments.length;
  var i, it;
  // for prevent leaking, start from objects
  for (i = 0; i < length; i++) {
    if (isObject(it = arguments[i])) active = active.next(i, it, true);
  }
  if (this === $Object && active === root) throw $TypeError('Composite keys must contain a non-primitive component');
  for (i = 0; i < length; i++) {
    if (!isObject(it = arguments[i])) active = active.next(i, it, false);
  } return active;
};