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node_modules/core-js/modules/_iter-define.js
| 69 lines
| 2.7 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var LIBRARY = require('./_library'); | ||||
| var $export = require('./_export'); | ||||
| var redefine = require('./_redefine'); | ||||
| var hide = require('./_hide'); | ||||
| 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 = $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 && typeof IteratorPrototype[ITERATOR] != 'function') 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; | ||||
| }; | ||||