| 'use strict'; |
| |
| Object.defineProperty(exports, "__esModule", { |
| value: true |
| }); |
| exports.default = whilst; |
| |
| var _noop = require('lodash/noop'); |
| |
| var _noop2 = _interopRequireDefault(_noop); |
| |
| var _slice = require('./internal/slice'); |
| |
| var _slice2 = _interopRequireDefault(_slice); |
| |
| var _onlyOnce = require('./internal/onlyOnce'); |
| |
| var _onlyOnce2 = _interopRequireDefault(_onlyOnce); |
| |
| var _wrapAsync = require('./internal/wrapAsync'); |
| |
| var _wrapAsync2 = _interopRequireDefault(_wrapAsync); |
| |
| function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } |
| |
| /** |
| * Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when |
| * stopped, or an error occurs. |
| * |
| * @name whilst |
| * @static |
| * @memberOf module:ControlFlow |
| * @method |
| * @category Control Flow |
| * @param {Function} test - synchronous truth test to perform before each |
| * execution of `iteratee`. Invoked with (). |
| * @param {AsyncFunction} iteratee - An async function which is called each time |
| * `test` passes. Invoked with (callback). |
| * @param {Function} [callback] - A callback which is called after the test |
| * function has failed and repeated execution of `iteratee` has stopped. `callback` |
| * will be passed an error and any arguments passed to the final `iteratee`'s |
| * callback. Invoked with (err, [results]); |
| * @returns undefined |
| * @example |
| * |
| * var count = 0; |
| * async.whilst( |
| * function() { return count < 5; }, |
| * function(callback) { |
| * count++; |
| * setTimeout(function() { |
| * callback(null, count); |
| * }, 1000); |
| * }, |
| * function (err, n) { |
| * // 5 seconds have passed, n = 5 |
| * } |
| * ); |
| */ |
| function whilst(test, iteratee, callback) { |
| callback = (0, _onlyOnce2.default)(callback || _noop2.default); |
| var _iteratee = (0, _wrapAsync2.default)(iteratee); |
| if (!test()) return callback(null); |
| var next = function (err /*, ...args*/) { |
| if (err) return callback(err); |
| if (test()) return _iteratee(next); |
| var args = (0, _slice2.default)(arguments, 1); |
| callback.apply(null, [null].concat(args)); |
| }; |
| _iteratee(next); |
| } |
| module.exports = exports['default']; |