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85 lines
3.2 KiB
85 lines
3.2 KiB
'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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