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