| 'use strict'; |
| var global = require('./_global'); |
| var $export = require('./_export'); |
| var redefine = require('./_redefine'); |
| var redefineAll = require('./_redefine-all'); |
| var meta = require('./_meta'); |
| var forOf = require('./_for-of'); |
| var anInstance = require('./_an-instance'); |
| var isObject = require('./_is-object'); |
| var fails = require('./_fails'); |
| var $iterDetect = require('./_iter-detect'); |
| var setToStringTag = require('./_set-to-string-tag'); |
| var inheritIfRequired = require('./_inherit-if-required'); |
| |
| module.exports = function (NAME, wrapper, methods, common, IS_MAP, IS_WEAK) { |
| var Base = global[NAME]; |
| var C = Base; |
| var ADDER = IS_MAP ? 'set' : 'add'; |
| var proto = C && C.prototype; |
| var O = {}; |
| var fixMethod = function (KEY) { |
| var fn = proto[KEY]; |
| redefine(proto, KEY, |
| KEY == 'delete' ? function (a) { |
| return IS_WEAK && !isObject(a) ? false : fn.call(this, a === 0 ? 0 : a); |
| } : KEY == 'has' ? function has(a) { |
| return IS_WEAK && !isObject(a) ? false : fn.call(this, a === 0 ? 0 : a); |
| } : KEY == 'get' ? function get(a) { |
| return IS_WEAK && !isObject(a) ? undefined : fn.call(this, a === 0 ? 0 : a); |
| } : KEY == 'add' ? function add(a) { fn.call(this, a === 0 ? 0 : a); return this; } |
| : function set(a, b) { fn.call(this, a === 0 ? 0 : a, b); return this; } |
| ); |
| }; |
| if (typeof C != 'function' || !(IS_WEAK || proto.forEach && !fails(function () { |
| new C().entries().next(); |
| }))) { |
| // create collection constructor |
| C = common.getConstructor(wrapper, NAME, IS_MAP, ADDER); |
| redefineAll(C.prototype, methods); |
| meta.NEED = true; |
| } else { |
| var instance = new C(); |
| // early implementations not supports chaining |
| var HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) != instance; |
| // V8 ~ Chromium 40- weak-collections throws on primitives, but should return false |
| var THROWS_ON_PRIMITIVES = fails(function () { instance.has(1); }); |
| // most early implementations doesn't supports iterables, most modern - not close it correctly |
| var ACCEPT_ITERABLES = $iterDetect(function (iter) { new C(iter); }); // eslint-disable-line no-new |
| // for early implementations -0 and +0 not the same |
| var BUGGY_ZERO = !IS_WEAK && fails(function () { |
| // V8 ~ Chromium 42- fails only with 5+ elements |
| var $instance = new C(); |
| var index = 5; |
| while (index--) $instance[ADDER](index, index); |
| return !$instance.has(-0); |
| }); |
| if (!ACCEPT_ITERABLES) { |
| C = wrapper(function (target, iterable) { |
| anInstance(target, C, NAME); |
| var that = inheritIfRequired(new Base(), target, C); |
| if (iterable != undefined) forOf(iterable, IS_MAP, that[ADDER], that); |
| return that; |
| }); |
| C.prototype = proto; |
| proto.constructor = C; |
| } |
| if (THROWS_ON_PRIMITIVES || BUGGY_ZERO) { |
| fixMethod('delete'); |
| fixMethod('has'); |
| IS_MAP && fixMethod('get'); |
| } |
| if (BUGGY_ZERO || HASNT_CHAINING) fixMethod(ADDER); |
| // weak collections should not contains .clear method |
| if (IS_WEAK && proto.clear) delete proto.clear; |
| } |
| |
| setToStringTag(C, NAME); |
| |
| O[NAME] = C; |
| $export($export.G + $export.W + $export.F * (C != Base), O); |
| |
| if (!IS_WEAK) common.setStrong(C, NAME, IS_MAP); |
| |
| return C; |
| }; |