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43 lines
1.4 KiB
43 lines
1.4 KiB
'use strict'; |
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// https://github.com/tc39/proposal-iterator-helpers |
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var $ = require('../internals/export'); |
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var apply = require('../internals/function-apply'); |
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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 createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy'); |
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var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise, args) { |
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var state = this; |
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var filterer = state.filterer; |
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return new Promise(function (resolve, reject) { |
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var loop = function () { |
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try { |
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Promise.resolve(anObject(apply(state.next, state.iterator, args))).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({ done: true, value: undefined }); |
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} else { |
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var value = step.value; |
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Promise.resolve(filterer(value)).then(function (selected) { |
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selected ? resolve({ done: false, value: value }) : loop(); |
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}, reject); |
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} |
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} catch (err) { reject(err); } |
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}, reject); |
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} catch (error) { reject(error); } |
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}; |
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loop(); |
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}); |
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}); |
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$({ target: 'AsyncIterator', proto: true, real: true, forced: true }, { |
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filter: function filter(filterer) { |
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return new AsyncIteratorProxy({ |
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iterator: anObject(this), |
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filterer: aCallable(filterer) |
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}); |
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} |
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});
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