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