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