79 lines
3.0 KiB
JavaScript
79 lines
3.0 KiB
JavaScript
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'use strict';
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var global = require('./$.global')
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, $export = require('./$.export')
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, redefine = require('./$.redefine')
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, redefineAll = require('./$.redefine-all')
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, forOf = require('./$.for-of')
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, strictNew = require('./$.strict-new')
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, isObject = require('./$.is-object')
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, fails = require('./$.fails')
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, $iterDetect = require('./$.iter-detect')
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, setToStringTag = require('./$.set-to-string-tag');
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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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, C = Base
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, ADDER = IS_MAP ? 'set' : 'add'
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, proto = C && C.prototype
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, 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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} else {
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var instance = new C
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// early implementations not supports chaining
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, 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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, 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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, 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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, BUGGY_ZERO;
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if(!ACCEPT_ITERABLES){
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C = wrapper(function(target, iterable){
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strictNew(target, C, NAME);
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var that = new Base;
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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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IS_WEAK || instance.forEach(function(val, key){
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BUGGY_ZERO = 1 / key === -Infinity;
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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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