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'use strict';
var global = require('./_global')
, $export = require('./_export')
, redefine = require('./_redefine')
, redefineAll = require('./_redefine-all')
, meta = require('./_meta')
, forOf = require('./_for-of')
, anInstance = require('./_an-instance')
, isObject = require('./_is-object')
, fails = require('./_fails')
, $iterDetect = require('./_iter-detect')
, setToStringTag = require('./_set-to-string-tag')
, inheritIfRequired = require('./_inherit-if-required');
module.exports = function(NAME, wrapper, methods, common, IS_MAP, IS_WEAK){
var Base = global[NAME]
, C = Base
, ADDER = IS_MAP ? 'set' : 'add'
, proto = C && C.prototype
, 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
, HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) != instance
// V8 ~ Chromium 40- weak-collections throws on primitives, but should return false
, THROWS_ON_PRIMITIVES = fails(function(){ instance.has(1); })
// most early implementations doesn't supports iterables, most modern - not close it correctly
, ACCEPT_ITERABLES = $iterDetect(function(iter){ new C(iter); }) // eslint-disable-line no-new
// for early implementations -0 and +0 not the same
, BUGGY_ZERO = !IS_WEAK && fails(function(){
// V8 ~ Chromium 42- fails only with 5+ elements
var $instance = new C()
, index = 5;
while(index--)$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;
};
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