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96 lines
3.1 KiB
96 lines
3.1 KiB
3 years ago
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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 global = require('../internals/global');
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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 getBuiltIn = require('../internals/get-built-in');
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var getMethod = require('../internals/get-method');
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var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;
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var TypeError = global.TypeError;
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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 (iterator, fn, target) {
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anObject(iterator);
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var Promise = getBuiltIn('Promise');
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var next = aCallable(iterator.next);
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var index = 0;
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var MAPPING = fn !== undefined;
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if (MAPPING || !IS_TO_ARRAY) aCallable(fn);
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return new Promise(function (resolve, reject) {
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var closeIteration = function (method, argument) {
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try {
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var returnMethod = getMethod(iterator, 'return');
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if (returnMethod) {
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return Promise.resolve(call(returnMethod, iterator)).then(function () {
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method(argument);
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}, function (error) {
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reject(error);
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});
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}
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} catch (error2) {
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return reject(error2);
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} method(argument);
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};
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var onError = function (error) {
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closeIteration(reject, error);
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};
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var loop = function () {
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try {
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if (IS_TO_ARRAY && (index > MAX_SAFE_INTEGER) && MAPPING) {
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throw TypeError('The allowed number of iterations has been exceeded');
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}
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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 = index;
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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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if (MAPPING) {
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Promise.resolve(IS_TO_ARRAY ? fn(value, index) : fn(value)).then(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() : closeIteration(resolve, false);
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} else if (IS_TO_ARRAY) {
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target[index++] = result;
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loop();
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} else {
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result ? closeIteration(resolve, IS_SOME || value) : loop();
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}
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}, onError);
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} else {
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target[index++] = value;
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loop();
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}
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}
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} catch (error) { onError(error); }
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}, onError);
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} catch (error2) { onError(error2); }
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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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