71 lines
2.7 KiB
JavaScript
71 lines
2.7 KiB
JavaScript
'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 = $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;
|
|
};
|