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'use strict';
var LIBRARY = require('./_library')
, $export = require('./_export')
, redefine = require('./_redefine')
, hide = require('./_hide')
, has = require('./_has')
, Iterators = require('./_iterators')
, $iterCreate = require('./_iter-create')
, setToStringTag = require('./_set-to-string-tag')
, getPrototypeOf = require('./_object-gpo')
, ITERATOR = require('./_wks')('iterator')
, BUGGY = !([].keys && 'next' in [].keys()) // Safari has buggy iterators w/o `next`
, FF_ITERATOR = '@@iterator'
, KEYS = 'keys'
, VALUES = 'values';
var returnThis = function(){ return this; };
module.exports = function(Base, NAME, Constructor, next, DEFAULT, IS_SET, FORCED){
$iterCreate(Constructor, NAME, next);
var getMethod = function(kind){
if(!BUGGY && kind in proto)return proto[kind];
switch(kind){
case KEYS: return function keys(){ return new Constructor(this, kind); };
case VALUES: return function values(){ return new Constructor(this, kind); };
} return function entries(){ return new Constructor(this, kind); };
};
var TAG = NAME + ' Iterator'
, DEF_VALUES = DEFAULT == VALUES
, VALUES_BUG = false
, proto = Base.prototype
, $native = proto[ITERATOR] || proto[FF_ITERATOR] || DEFAULT && proto[DEFAULT]
, $default = $native || getMethod(DEFAULT)
, $entries = DEFAULT ? !DEF_VALUES ? $default : getMethod('entries') : undefined
, $anyNative = NAME == 'Array' ? proto.entries || $native : $native
, methods, key, IteratorPrototype;
// Fix native
if($anyNative){
IteratorPrototype = getPrototypeOf($anyNative.call(new Base));
if(IteratorPrototype !== Object.prototype){
// Set @@toStringTag to native iterators
setToStringTag(IteratorPrototype, TAG, true);
// fix for some old engines
if(!LIBRARY && !has(IteratorPrototype, ITERATOR))hide(IteratorPrototype, ITERATOR, returnThis);
}
}
// fix Array#{values, @@iterator}.name in V8 / FF
if(DEF_VALUES && $native && $native.name !== VALUES){
VALUES_BUG = true;
$default = function values(){ return $native.call(this); };
}
// Define iterator
if((!LIBRARY || FORCED) && (BUGGY || VALUES_BUG || !proto[ITERATOR])){
hide(proto, ITERATOR, $default);
}
// Plug for library
Iterators[NAME] = $default;
Iterators[TAG] = returnThis;
if(DEFAULT){
methods = {
values: DEF_VALUES ? $default : getMethod(VALUES),
keys: IS_SET ? $default : getMethod(KEYS),
entries: $entries
};
if(FORCED)for(key in methods){
if(!(key in proto))redefine(proto, key, methods[key]);
} else $export($export.P + $export.F * (BUGGY || VALUES_BUG), NAME, methods);
}
return methods;
};
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