prepack/lib/intrinsics/ecma262/WeakSet.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;

var _index = require("../../values/index.js");

var _completions = require("../../completions.js");

var _index2 = require("../../methods/index.js");

var _singletons = require("../../singletons.js");

var _invariant = _interopRequireDefault(require("../../invariant.js"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
function _default(realm) {
  // ECMA262 23.4.1.1
  let func = new _index.NativeFunctionValue(realm, "WeakSet", "WeakSet", 0, (args, [iterable], argCount, NewTarget) => {
    // 1. If NewTarget is undefined, throw a TypeError exception.
    if (!NewTarget) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);
    } // 2. Let set be ? OrdinaryCreateFromConstructor(NewTarget, "%WeakSetPrototype%", « [[WeakSetData]] »).


    let set = _singletons.Create.OrdinaryCreateFromConstructor(realm, NewTarget, "WeakSetPrototype", {
      $WeakSetData: undefined
    }); // 3. Set set.[[WeakSetData]] to a new empty List.


    set.$WeakSetData = []; // 4. If iterable is not present, let iterable be undefined.

    if (iterable === undefined) iterable = realm.intrinsics.undefined;
    let iter, adder; // 5. If iterable is either undefined or null, let iter be undefined.

    if (iterable instanceof _index.UndefinedValue || iterable instanceof _index.NullValue) {
      iter = realm.intrinsics.undefined;
      adder = realm.intrinsics.undefined;
    } else {
      // 6. Else,
      // a. Let adder be ? Get(set, "add").
      adder = (0, _index2.Get)(realm, set, "add"); // b. If IsCallable(adder) is false, throw a TypeError exception.

      if (!(0, _index2.IsCallable)(realm, adder)) {
        throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "IsCallable(adder) is false");
      } // c. Let iter be ? GetIterator(iterable).


      iter = (0, _index2.GetIterator)(realm, iterable);
    } // 7. If iter is undefined, return set.


    if (iter instanceof _index.UndefinedValue) return set; // 8. Repeat

    while (true) {
      // a. Let next be ? IteratorStep(iter).
      let next = (0, _index2.IteratorStep)(realm, iter); // b. If next is false, return set.

      if (next === false) return set; // c. Let nextValue be ? IteratorValue(next).

      let nextValue = (0, _index2.IteratorValue)(realm, next); // d. Let status be Call(adder, set, « nextValue »).

      try {
        (0, _index2.Call)(realm, adder, set, [nextValue]);
      } catch (statusCompletion) {
        if (!(statusCompletion instanceof _completions.AbruptCompletion)) throw statusCompletion; // e. If status is an abrupt completion, return ? IteratorClose(iter, status).

        throw (0, _index2.IteratorClose)(realm, iter, statusCompletion);
      }
    }

    (0, _invariant.default)(false);
  });
  return func;
}
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