68 lines
2.2 KiB
JavaScript
68 lines
2.2 KiB
JavaScript
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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.js');
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var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
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var _wrapAsync = require('./internal/wrapAsync.js');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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var _awaitify = require('./internal/awaitify.js');
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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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* The post-check version of [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
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* the order of operations, the arguments `test` and `iteratee` are switched.
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*
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* `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
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*
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* @name doWhilst
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @see [async.whilst]{@link module:ControlFlow.whilst}
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* @category Control Flow
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* @param {AsyncFunction} iteratee - A function which is called each time `test`
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* passes. Invoked with (callback).
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* @param {AsyncFunction} test - asynchronous truth test to perform after each
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* execution of `iteratee`. Invoked with (...args, callback), where `...args` are the
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* non-error args from the previous callback of `iteratee`.
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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.
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* `callback` will be passed an error and any arguments passed to the final
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* `iteratee`'s callback. Invoked with (err, [results]);
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* @returns {Promise} a promise, if no callback is passed
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*/
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function doWhilst(iteratee, test, 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, ...args) {
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if (err) return callback(err);
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if (err === false) return;
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results = args;
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_test(...args, 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 check(null, true);
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}
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exports.default = (0, _awaitify2.default)(doWhilst, 3);
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module.exports = exports.default;
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