prepack/lib/intrinsics/ecma262/WeakMap.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) {
  let func = new _index.NativeFunctionValue(realm, "WeakMap", "WeakMap", 0, (args, [iterable], argCount, NewTarget) => {
    // 1. If NewTarget is undefined, throw a TypeError exception.
    if (!NewTarget) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);
    } // 2. Let map be ? OrdinaryCreateFromConstructor(NewTarget, "%WeakMapPrototype%", « [[WeakMapData]] »).


    let map = _singletons.Create.OrdinaryCreateFromConstructor(realm, NewTarget, "WeakMapPrototype", {
      $WeakMapData: undefined
    }); // 3. Set map's [[WeakMapData]] internal slot to a new empty List.


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

    if (iterable && realm.isCompatibleWith(realm.MOBILE_JSC_VERSION)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "the weak map constructor doesn't take arguments");
    }

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

    let iter, adder;

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

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


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


    if (iter instanceof _index.UndefinedValue) {
      return map;
    } // 8. Repeat


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

      if (!next) return map; // c. Let nextItem be ? IteratorValue(next).

      let nextItem = (0, _index2.IteratorValue)(realm, next).throwIfNotConcrete(); // d. If Type(nextItem) is not Object, then

      if (!(nextItem instanceof _index.ObjectValue)) {
        // i. Let error be Completion{[[Type]]: throw, [[Value]]: a newly created TypeError object, [[Target]]: empty}.
        let error = realm.createErrorThrowCompletion(realm.intrinsics.TypeError); // ii. Return ? IteratorClose(iter, error).

        throw (0, _index2.IteratorClose)(realm, iter, error);
      } // e. Let k be Get(nextItem, "0").


      let k;

      try {
        k = (0, _index2.Get)(realm, nextItem, "0");
      } catch (kCompletion) {
        if (kCompletion instanceof _completions.AbruptCompletion) {
          // f. If k is an abrupt completion, return ? IteratorClose(iter, k).
          throw (0, _index2.IteratorClose)(realm, iter, kCompletion);
        } else throw kCompletion;
      } // g. Let v be Get(nextItem, "1").


      let v;

      try {
        v = (0, _index2.Get)(realm, nextItem, "1");
      } catch (vCompletion) {
        if (vCompletion instanceof _completions.AbruptCompletion) {
          // h. If v is an abrupt completion, return ? IteratorClose(iter, v).
          throw (0, _index2.IteratorClose)(realm, iter, vCompletion);
        } else throw vCompletion;
      } // i. Let status be Call(adder, map, « k.[[Value]], v.[[Value]] »).


      let status;

      try {
        status = (0, _index2.Call)(realm, adder, map, [k, v]);
      } catch (statusCompletion) {
        if (statusCompletion instanceof _completions.AbruptCompletion) {
          // j. If status is an abrupt completion, return ? IteratorClose(iter, status).
          throw (0, _index2.IteratorClose)(realm, iter, statusCompletion);
        } else throw statusCompletion;
      }

      status;
    }

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