HORIZON PROJECT

'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'];