45 lines
1.7 KiB
JavaScript
45 lines
1.7 KiB
JavaScript
|
function _asyncIterator(iterable) {
|
||
|
|
var method,
|
||
|
|
async,
|
||
|
|
sync,
|
||
|
|
retry = 2;
|
||
|
|
for ("undefined" != typeof Symbol && (async = Symbol.asyncIterator, sync = Symbol.iterator); retry--;) {
|
||
|
|
if (async && null != (method = iterable[async])) return method.call(iterable);
|
||
|
|
if (sync && null != (method = iterable[sync])) return new AsyncFromSyncIterator(method.call(iterable));
|
||
|
|
async = "@@asyncIterator", sync = "@@iterator";
|
||
|
|
}
|
||
|
|
throw new TypeError("Object is not async iterable");
|
||
|
|
}
|
||
|
|
function AsyncFromSyncIterator(s) {
|
||
|
|
function AsyncFromSyncIteratorContinuation(r) {
|
||
|
|
if (Object(r) !== r) return Promise.reject(new TypeError(r + " is not an object."));
|
||
|
|
var done = r.done;
|
||
|
|
return Promise.resolve(r.value).then(function (value) {
|
||
|
|
return {
|
||
|
|
value: value,
|
||
|
|
done: done
|
||
|
|
};
|
||
|
|
});
|
||
|
|
}
|
||
|
|
return AsyncFromSyncIterator = function AsyncFromSyncIterator(s) {
|
||
|
|
this.s = s, this.n = s.next;
|
||
|
|
}, AsyncFromSyncIterator.prototype = {
|
||
|
|
s: null,
|
||
|
|
n: null,
|
||
|
|
next: function next() {
|
||
|
|
return AsyncFromSyncIteratorContinuation(this.n.apply(this.s, arguments));
|
||
|
|
},
|
||
|
|
"return": function _return(value) {
|
||
|
|
var ret = this.s["return"];
|
||
|
|
return void 0 === ret ? Promise.resolve({
|
||
|
|
value: value,
|
||
|
|
done: !0
|
||
|
|
}) : AsyncFromSyncIteratorContinuation(ret.apply(this.s, arguments));
|
||
|
|
},
|
||
|
|
"throw": function _throw(value) {
|
||
|
|
var thr = this.s["return"];
|
||
|
|
return void 0 === thr ? Promise.reject(value) : AsyncFromSyncIteratorContinuation(thr.apply(this.s, arguments));
|
||
|
|
}
|
||
|
|
}, new AsyncFromSyncIterator(s);
|
||
|
|
}
|
||
|
|
module.exports = _asyncIterator, module.exports.__esModule = true, module.exports["default"] = module.exports;
|