You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.7 KiB
49 lines
1.7 KiB
1 month ago
|
'use strict';
|
||
|
|
var $ = require('../internals/export');
|
||
|
|
var call = require('../internals/function-call');
|
||
|
|
var anObject = require('../internals/an-object');
|
||
|
|
var getIteratorDirect = require('../internals/get-iterator-direct');
|
||
|
|
var notANaN = require('../internals/not-a-nan');
|
||
|
|
var toPositiveInteger = require('../internals/to-positive-integer');
|
||
|
|
var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
|
||
|
|
var createIterResultObject = require('../internals/create-iter-result-object');
|
||
|
|
var IS_PURE = require('../internals/is-pure');
|
||
|
|
|
||
|
|
var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise) {
|
||
|
|
var state = this;
|
||
|
|
var iterator = state.iterator;
|
||
|
|
var returnMethod;
|
||
|
|
|
||
|
|
if (!state.remaining--) {
|
||
|
|
var resultDone = createIterResultObject(undefined, true);
|
||
|
|
state.done = true;
|
||
|
|
returnMethod = iterator['return'];
|
||
|
|
if (returnMethod !== undefined) {
|
||
|
|
return Promise.resolve(call(returnMethod, iterator, undefined)).then(function () {
|
||
|
|
return resultDone;
|
||
|
|
});
|
||
|
|
}
|
||
|
|
return resultDone;
|
||
|
|
} return Promise.resolve(call(state.next, iterator)).then(function (step) {
|
||
|
|
if (anObject(step).done) {
|
||
|
|
state.done = true;
|
||
|
|
return createIterResultObject(undefined, true);
|
||
|
|
} return createIterResultObject(step.value, false);
|
||
|
|
}).then(null, function (error) {
|
||
|
|
state.done = true;
|
||
|
|
throw error;
|
||
|
|
});
|
||
|
|
});
|
||
|
|
|
||
|
|
// `AsyncIterator.prototype.take` method
|
||
|
|
// https://github.com/tc39/proposal-async-iterator-helpers
|
||
|
|
$({ target: 'AsyncIterator', proto: true, real: true, forced: IS_PURE }, {
|
||
|
|
take: function take(limit) {
|
||
|
|
anObject(this);
|
||
|
|
var remaining = toPositiveInteger(notANaN(+limit));
|
||
|
|
return new AsyncIteratorProxy(getIteratorDirect(this), {
|
||
|
|
remaining: remaining
|
||
|
|
});
|
||
|
|
}
|
||
|
|
});
|