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78 lines
2.3 KiB
JavaScript
78 lines
2.3 KiB
JavaScript
5 years ago
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _onlyOnce = require('./internal/onlyOnce');
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var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
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var _wrapAsync = require('./internal/wrapAsync');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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var _awaitify = require('./internal/awaitify');
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var _awaitify2 = _interopRequireDefault(_awaitify);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when
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* stopped, or an error occurs.
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*
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* @name whilst
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @category Control Flow
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* @param {AsyncFunction} test - asynchronous truth test to perform before each
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* execution of `iteratee`. Invoked with ().
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* @param {AsyncFunction} iteratee - An async function which is called each time
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* `test` passes. Invoked with (callback).
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* @param {Function} [callback] - A callback which is called after the test
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* function has failed and repeated execution of `iteratee` has stopped. `callback`
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* will be passed an error and any arguments passed to the final `iteratee`'s
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* callback. Invoked with (err, [results]);
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* @returns {Promise} a promise, if no callback is passed
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* @example
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*
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* var count = 0;
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* async.whilst(
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* function test(cb) { cb(null, count < 5;) },
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* function iter(callback) {
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* count++;
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* setTimeout(function() {
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* callback(null, count);
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* }, 1000);
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* },
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* function (err, n) {
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* // 5 seconds have passed, n = 5
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* }
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* );
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*/
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function whilst(test, iteratee, callback) {
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callback = (0, _onlyOnce2.default)(callback);
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var _fn = (0, _wrapAsync2.default)(iteratee);
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var _test = (0, _wrapAsync2.default)(test);
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var results = [];
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function next(err, ...rest) {
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if (err) return callback(err);
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results = rest;
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if (err === false) return;
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_test(check);
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}
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function check(err, truth) {
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if (err) return callback(err);
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if (err === false) return;
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if (!truth) return callback(null, ...results);
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_fn(next);
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}
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return _test(check);
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}
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exports.default = (0, _awaitify2.default)(whilst, 3);
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module.exports = exports['default'];
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