yunbaolive/web/node/node_modules/async/doWhilst.js

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = doWhilst;

var _noop = require('lodash/noop');

var _noop2 = _interopRequireDefault(_noop);

var _rest = require('./internal/rest');

var _rest2 = _interopRequireDefault(_rest);

var _onlyOnce = require('./internal/onlyOnce');

var _onlyOnce2 = _interopRequireDefault(_onlyOnce);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * The post-check version of [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
 * the order of operations, the arguments `test` and `iteratee` are switched.
 *
 * `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
 *
 * @name doWhilst
 * @static
 * @memberOf module:ControlFlow
 * @method
 * @see [async.whilst]{@link module:ControlFlow.whilst}
 * @category Control Flow
 * @param {Function} iteratee - A function which is called each time `test`
 * passes. The function is passed a `callback(err)`, which must be called once
 * it has completed with an optional `err` argument. Invoked with (callback).
 * @param {Function} test - synchronous truth test to perform after each
 * execution of `iteratee`. Invoked with the non-error callback results of 
 * `iteratee`.
 * @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]);
 */
function doWhilst(iteratee, test, callback) {
    callback = (0, _onlyOnce2.default)(callback || _noop2.default);
    var next = (0, _rest2.default)(function (err, args) {
        if (err) return callback(err);
        if (test.apply(this, args)) return iteratee(next);
        callback.apply(null, [null].concat(args));
    });
    iteratee(next);
}
module.exports = exports['default'];