105 lines
		
	
	
		
			3.1 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			105 lines
		
	
	
		
			3.1 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
'use strict';
 | 
						|
 | 
						|
Object.defineProperty(exports, "__esModule", {
 | 
						|
    value: true
 | 
						|
});
 | 
						|
 | 
						|
var _once = require('./internal/once.js');
 | 
						|
 | 
						|
var _once2 = _interopRequireDefault(_once);
 | 
						|
 | 
						|
var _onlyOnce = require('./internal/onlyOnce.js');
 | 
						|
 | 
						|
var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
 | 
						|
 | 
						|
var _wrapAsync = require('./internal/wrapAsync.js');
 | 
						|
 | 
						|
var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
 | 
						|
 | 
						|
var _awaitify = require('./internal/awaitify.js');
 | 
						|
 | 
						|
var _awaitify2 = _interopRequireDefault(_awaitify);
 | 
						|
 | 
						|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
 | 
						|
 | 
						|
/**
 | 
						|
 * Runs the `tasks` array of functions in series, each passing their results to
 | 
						|
 * the next in the array. However, if any of the `tasks` pass an error to their
 | 
						|
 * own callback, the next function is not executed, and the main `callback` is
 | 
						|
 * immediately called with the error.
 | 
						|
 *
 | 
						|
 * @name waterfall
 | 
						|
 * @static
 | 
						|
 * @memberOf module:ControlFlow
 | 
						|
 * @method
 | 
						|
 * @category Control Flow
 | 
						|
 * @param {Array} tasks - An array of [async functions]{@link AsyncFunction}
 | 
						|
 * to run.
 | 
						|
 * Each function should complete with any number of `result` values.
 | 
						|
 * The `result` values will be passed as arguments, in order, to the next task.
 | 
						|
 * @param {Function} [callback] - An optional callback to run once all the
 | 
						|
 * functions have completed. This will be passed the results of the last task's
 | 
						|
 * callback. Invoked with (err, [results]).
 | 
						|
 * @returns {Promise} a promise, if a callback is omitted
 | 
						|
 * @example
 | 
						|
 *
 | 
						|
 * async.waterfall([
 | 
						|
 *     function(callback) {
 | 
						|
 *         callback(null, 'one', 'two');
 | 
						|
 *     },
 | 
						|
 *     function(arg1, arg2, callback) {
 | 
						|
 *         // arg1 now equals 'one' and arg2 now equals 'two'
 | 
						|
 *         callback(null, 'three');
 | 
						|
 *     },
 | 
						|
 *     function(arg1, callback) {
 | 
						|
 *         // arg1 now equals 'three'
 | 
						|
 *         callback(null, 'done');
 | 
						|
 *     }
 | 
						|
 * ], function (err, result) {
 | 
						|
 *     // result now equals 'done'
 | 
						|
 * });
 | 
						|
 *
 | 
						|
 * // Or, with named functions:
 | 
						|
 * async.waterfall([
 | 
						|
 *     myFirstFunction,
 | 
						|
 *     mySecondFunction,
 | 
						|
 *     myLastFunction,
 | 
						|
 * ], function (err, result) {
 | 
						|
 *     // result now equals 'done'
 | 
						|
 * });
 | 
						|
 * function myFirstFunction(callback) {
 | 
						|
 *     callback(null, 'one', 'two');
 | 
						|
 * }
 | 
						|
 * function mySecondFunction(arg1, arg2, callback) {
 | 
						|
 *     // arg1 now equals 'one' and arg2 now equals 'two'
 | 
						|
 *     callback(null, 'three');
 | 
						|
 * }
 | 
						|
 * function myLastFunction(arg1, callback) {
 | 
						|
 *     // arg1 now equals 'three'
 | 
						|
 *     callback(null, 'done');
 | 
						|
 * }
 | 
						|
 */
 | 
						|
function waterfall(tasks, callback) {
 | 
						|
    callback = (0, _once2.default)(callback);
 | 
						|
    if (!Array.isArray(tasks)) return callback(new Error('First argument to waterfall must be an array of functions'));
 | 
						|
    if (!tasks.length) return callback();
 | 
						|
    var taskIndex = 0;
 | 
						|
 | 
						|
    function nextTask(args) {
 | 
						|
        var task = (0, _wrapAsync2.default)(tasks[taskIndex++]);
 | 
						|
        task(...args, (0, _onlyOnce2.default)(next));
 | 
						|
    }
 | 
						|
 | 
						|
    function next(err, ...args) {
 | 
						|
        if (err === false) return;
 | 
						|
        if (err || taskIndex === tasks.length) {
 | 
						|
            return callback(err, ...args);
 | 
						|
        }
 | 
						|
        nextTask(args);
 | 
						|
    }
 | 
						|
 | 
						|
    nextTask([]);
 | 
						|
}
 | 
						|
 | 
						|
exports.default = (0, _awaitify2.default)(waterfall);
 | 
						|
module.exports = exports.default; |