| 1 |
'use strict'; |
| 2 |
|
| 3 |
Object.defineProperty(exports, "__esModule", { |
| 4 |
value: true |
| 5 |
}); |
| 6 |
exports.default = whilst; |
| 7 |
|
| 8 |
var _noop = require('lodash/noop'); |
| 9 |
|
| 10 |
var _noop2 = _interopRequireDefault(_noop); |
| 11 |
|
| 12 |
var _slice = require('./internal/slice'); |
| 13 |
|
| 14 |
var _slice2 = _interopRequireDefault(_slice); |
| 15 |
|
| 16 |
var _onlyOnce = require('./internal/onlyOnce'); |
| 17 |
|
| 18 |
var _onlyOnce2 = _interopRequireDefault(_onlyOnce); |
| 19 |
|
| 20 |
var _wrapAsync = require('./internal/wrapAsync'); |
| 21 |
|
| 22 |
var _wrapAsync2 = _interopRequireDefault(_wrapAsync); |
| 23 |
|
| 24 |
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } |
| 25 |
|
| 26 |
/** |
| 27 |
* Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when |
| 28 |
* stopped, or an error occurs. |
| 29 |
* |
| 30 |
* @name whilst |
| 31 |
* @static |
| 32 |
* @memberOf module:ControlFlow |
| 33 |
* @method |
| 34 |
* @category Control Flow |
| 35 |
* @param {Function} test - synchronous truth test to perform before each |
| 36 |
* execution of `iteratee`. Invoked with (). |
| 37 |
* @param {AsyncFunction} iteratee - An async function which is called each time |
| 38 |
* `test` passes. Invoked with (callback). |
| 39 |
* @param {Function} [callback] - A callback which is called after the test |
| 40 |
* function has failed and repeated execution of `iteratee` has stopped. `callback` |
| 41 |
* will be passed an error and any arguments passed to the final `iteratee`'s |
| 42 |
* callback. Invoked with (err, [results]); |
| 43 |
* @returns undefined |
| 44 |
* @example |
| 45 |
* |
| 46 |
* var count = 0; |
| 47 |
* async.whilst( |
| 48 |
* function() { return count < 5; }, |
| 49 |
* function(callback) { |
| 50 |
* count++; |
| 51 |
* setTimeout(function() { |
| 52 |
* callback(null, count); |
| 53 |
* }, 1000); |
| 54 |
* }, |
| 55 |
* function (err, n) { |
| 56 |
* // 5 seconds have passed, n = 5 |
| 57 |
* } |
| 58 |
* ); |
| 59 |
*/ |
| 60 |
function whilst(test, iteratee, callback) { |
| 61 |
callback = (0, _onlyOnce2.default)(callback || _noop2.default); |
| 62 |
var _iteratee = (0, _wrapAsync2.default)(iteratee); |
| 63 |
if (!test()) return callback(null); |
| 64 |
var next = function (err /*, ...args*/) { |
| 65 |
if (err) return callback(err); |
| 66 |
if (test()) return _iteratee(next); |
| 67 |
var args = (0, _slice2.default)(arguments, 1); |
| 68 |
callback.apply(null, [null].concat(args)); |
| 69 |
}; |
| 70 |
_iteratee(next); |
| 71 |
} |
| 72 |
module.exports = exports['default']; |
