91 lines
3.2 KiB
JavaScript
91 lines
3.2 KiB
JavaScript
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'use strict';
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// https://github.com/tc39/proposal-iterator-helpers
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// https://github.com/tc39/proposal-array-from-async
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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 doesNotExceedSafeInteger = require('../internals/does-not-exceed-safe-integer');
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var getBuiltIn = require('../internals/get-built-in');
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var getIteratorDirect = require('../internals/get-iterator-direct');
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var closeAsyncIteration = require('../internals/async-iterator-close');
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var createMethod = function (TYPE) {
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var IS_TO_ARRAY = TYPE === 0;
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var IS_FOR_EACH = TYPE === 1;
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var IS_EVERY = TYPE === 2;
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var IS_SOME = TYPE === 3;
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return function (object, fn, target) {
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anObject(object);
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var MAPPING = fn !== undefined;
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if (MAPPING || !IS_TO_ARRAY) aCallable(fn);
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var record = getIteratorDirect(object);
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var Promise = getBuiltIn('Promise');
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var iterator = record.iterator;
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var next = record.next;
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var counter = 0;
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return new Promise(function (resolve, reject) {
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var ifAbruptCloseAsyncIterator = function (error) {
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closeAsyncIteration(iterator, reject, error, reject);
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};
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var loop = function () {
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try {
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if (MAPPING) try {
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doesNotExceedSafeInteger(counter);
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} catch (error5) { ifAbruptCloseAsyncIterator(error5); }
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Promise.resolve(anObject(call(next, iterator))).then(function (step) {
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try {
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if (anObject(step).done) {
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if (IS_TO_ARRAY) {
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target.length = counter;
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resolve(target);
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} else resolve(IS_SOME ? false : IS_EVERY || undefined);
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} else {
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var value = step.value;
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try {
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if (MAPPING) {
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var result = fn(value, counter);
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var handler = function ($result) {
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if (IS_FOR_EACH) {
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loop();
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} else if (IS_EVERY) {
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$result ? loop() : closeAsyncIteration(iterator, resolve, false, reject);
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} else if (IS_TO_ARRAY) {
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try {
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target[counter++] = $result;
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loop();
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} catch (error4) { ifAbruptCloseAsyncIterator(error4); }
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} else {
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$result ? closeAsyncIteration(iterator, resolve, IS_SOME || value, reject) : loop();
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}
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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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} else {
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target[counter++] = value;
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loop();
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}
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} catch (error3) { ifAbruptCloseAsyncIterator(error3); }
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}
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} catch (error2) { reject(error2); }
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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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};
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module.exports = {
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toArray: createMethod(0),
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forEach: createMethod(1),
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every: createMethod(2),
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some: createMethod(3),
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find: createMethod(4)
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};
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