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Extract asyncGeneratorDelegate/AsyncGenerator/awaitAsyncGenerator (no…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| /* @minVersion 7.0.0-beta.0 */ | ||
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| import AwaitValue from "AwaitValue"; | ||
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| export default function AsyncGenerator(gen) { | ||
| var front, back; | ||
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| function send(key, arg) { | ||
| return new Promise(function (resolve, reject) { | ||
| var request = { | ||
| key: key, | ||
| arg: arg, | ||
| resolve: resolve, | ||
| reject: reject, | ||
| next: null, | ||
| }; | ||
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| if (back) { | ||
| back = back.next = request; | ||
| } else { | ||
| front = back = request; | ||
| resume(key, arg); | ||
| } | ||
| }); | ||
| } | ||
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| function resume(key, arg) { | ||
| try { | ||
| var result = gen[key](arg); | ||
| var value = result.value; | ||
| var wrappedAwait = value instanceof AwaitValue; | ||
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| Promise.resolve(wrappedAwait ? value.wrapped : value).then( | ||
| function (arg) { | ||
| if (wrappedAwait) { | ||
| resume(key === "return" ? "return" : "next", arg); | ||
| return; | ||
| } | ||
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| settle(result.done ? "return" : "normal", arg); | ||
| }, | ||
| function (err) { | ||
| resume("throw", err); | ||
| } | ||
| ); | ||
| } catch (err) { | ||
| settle("throw", err); | ||
| } | ||
| } | ||
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| function settle(type, value) { | ||
| switch (type) { | ||
| case "return": | ||
| front.resolve({ value: value, done: true }); | ||
| break; | ||
| case "throw": | ||
| front.reject(value); | ||
| break; | ||
| default: | ||
| front.resolve({ value: value, done: false }); | ||
| break; | ||
| } | ||
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| front = front.next; | ||
| if (front) { | ||
| resume(front.key, front.arg); | ||
| } else { | ||
| back = null; | ||
| } | ||
| } | ||
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| this._invoke = send; | ||
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| // Hide "return" method if generator return is not supported | ||
| if (typeof gen.return !== "function") { | ||
| this.return = undefined; | ||
| } | ||
| } | ||
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| AsyncGenerator.prototype[ | ||
| (typeof Symbol === "function" && Symbol.asyncIterator) || "@@asyncIterator" | ||
| ] = function () { | ||
| return this; | ||
| }; | ||
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| AsyncGenerator.prototype.next = function (arg) { | ||
| return this._invoke("next", arg); | ||
| }; | ||
| AsyncGenerator.prototype.throw = function (arg) { | ||
| return this._invoke("throw", arg); | ||
| }; | ||
| AsyncGenerator.prototype.return = function (arg) { | ||
| return this._invoke("return", arg); | ||
| }; |
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