HORIZON PROJECT

'use strict';

Object.defineProperty(exports, "__esModule", {

    value: true

});

exports.default = whilst;

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 }; }

/**

 * 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 {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} [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);

    if (!test()) return callback(null);

    var next = (0, _rest2.default)(function (err, args) {

        if (err) return callback(err);

        if (test()) return iteratee(next);

        callback.apply(null, [null].concat(args));

    });

    iteratee(next);

}

module.exports = exports['default'];