59 lines
2.1 KiB
JavaScript
59 lines
2.1 KiB
JavaScript
Object.defineProperty(exports, "__esModule", { value: true });
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var iterall_1 = require("iterall");
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/**
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* Given an AsyncIterable and a callback function, return an AsyncIterator
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* which produces values mapped via calling the callback function.
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*/
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function mapAsyncIterator(iterator, callback, rejectCallback) {
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var _a;
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var $return;
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var abruptClose;
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if (typeof iterator.return === 'function') {
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$return = iterator.return;
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abruptClose = function (error) {
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var rethrow = function () { return Promise.reject(error); };
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return $return.call(iterator).then(rethrow, rethrow);
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};
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}
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function mapResult(result) {
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return result.done
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? result
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: asyncMapValue(result.value, callback).then(iteratorResult, abruptClose);
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}
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var mapReject;
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if (rejectCallback) {
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// Capture rejectCallback to ensure it cannot be null.
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var reject_1 = rejectCallback;
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mapReject = function (error) {
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return asyncMapValue(error, reject_1).then(iteratorResult, abruptClose);
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};
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}
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return _a = {
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next: function () {
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return iterator.next().then(mapResult, mapReject);
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},
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return: function () {
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return $return
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? $return.call(iterator).then(mapResult, mapReject)
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: Promise.resolve({ value: undefined, done: true });
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},
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throw: function (error) {
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if (typeof iterator.throw === 'function') {
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return iterator.throw(error).then(mapResult, mapReject);
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}
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return Promise.reject(error).catch(abruptClose);
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}
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},
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_a[iterall_1.$$asyncIterator] = function () {
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return this;
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},
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_a;
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}
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exports.default = mapAsyncIterator;
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function asyncMapValue(value, callback) {
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return new Promise(function (resolve) { return resolve(callback(value)); });
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}
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function iteratorResult(value) {
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return { value: value, done: false };
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}
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//# sourceMappingURL=mapAsyncIterator.js.map
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