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58 lines
1.9 KiB
58 lines
1.9 KiB
4 weeks ago
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'use strict';
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var call = require('../internals/function-call');
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var aCallable = require('../internals/a-callable');
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var anObject = require('../internals/an-object');
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var isObject = require('../internals/is-object');
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var getIteratorDirect = require('../internals/get-iterator-direct');
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var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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var createIterResultObject = require('../internals/create-iter-result-object');
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var closeAsyncIteration = require('../internals/async-iterator-close');
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var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise) {
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var state = this;
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var iterator = state.iterator;
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var mapper = state.mapper;
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return new Promise(function (resolve, reject) {
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var doneAndReject = function (error) {
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state.done = true;
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reject(error);
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};
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var ifAbruptCloseAsyncIterator = function (error) {
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closeAsyncIteration(iterator, doneAndReject, error, doneAndReject);
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};
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Promise.resolve(anObject(call(state.next, iterator))).then(function (step) {
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try {
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if (anObject(step).done) {
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state.done = true;
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resolve(createIterResultObject(undefined, true));
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} else {
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var value = step.value;
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try {
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var result = mapper(value, state.counter++);
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var handler = function (mapped) {
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resolve(createIterResultObject(mapped, false));
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};
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if (isObject(result)) Promise.resolve(result).then(handler, ifAbruptCloseAsyncIterator);
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else handler(result);
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} catch (error2) { ifAbruptCloseAsyncIterator(error2); }
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}
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} catch (error) { doneAndReject(error); }
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}, doneAndReject);
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});
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});
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// `AsyncIterator.prototype.map` method
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// https://github.com/tc39/proposal-iterator-helpers
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module.exports = function map(mapper) {
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anObject(this);
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aCallable(mapper);
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return new AsyncIteratorProxy(getIteratorDirect(this), {
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mapper: mapper
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});
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};
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