| 'use strict'; |
| var LIBRARY = require('./_library'); |
| var $export = require('./_export'); |
| var redefine = require('./_redefine'); |
| var hide = require('./_hide'); |
| var has = require('./_has'); |
| var Iterators = require('./_iterators'); |
| var $iterCreate = require('./_iter-create'); |
| var setToStringTag = require('./_set-to-string-tag'); |
| var getPrototypeOf = require('./_object-gpo'); |
| var ITERATOR = require('./_wks')('iterator'); |
| var BUGGY = !([].keys && 'next' in [].keys()); // Safari has buggy iterators w/o `next` |
| var FF_ITERATOR = '@@iterator'; |
| var KEYS = 'keys'; |
| var 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'; |
| var DEF_VALUES = DEFAULT == VALUES; |
| var VALUES_BUG = false; |
| var proto = Base.prototype; |
| var $native = proto[ITERATOR] || proto[FF_ITERATOR] || DEFAULT && proto[DEFAULT]; |
| var $default = (!BUGGY && $native) || getMethod(DEFAULT); |
| var $entries = DEFAULT ? !DEF_VALUES ? $default : getMethod('entries') : undefined; |
| var $anyNative = NAME == 'Array' ? proto.entries || $native : $native; |
| var methods, key, IteratorPrototype; |
| // Fix native |
| if ($anyNative) { |
| IteratorPrototype = getPrototypeOf($anyNative.call(new Base())); |
| if (IteratorPrototype !== Object.prototype && IteratorPrototype.next) { |
| // 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; |
| }; |