You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
2.9 KiB
91 lines
2.9 KiB
2 years ago
|
'use strict';
|
||
|
|
|
||
|
|
Object.defineProperty(exports, "__esModule", {
|
||
|
|
value: true
|
||
|
|
});
|
||
|
|
exports.default = seq;
|
||
|
|
|
||
|
|
var _noop = require('lodash/noop');
|
||
|
|
|
||
|
|
var _noop2 = _interopRequireDefault(_noop);
|
||
|
|
|
||
|
|
var _slice = require('./internal/slice');
|
||
|
|
|
||
|
|
var _slice2 = _interopRequireDefault(_slice);
|
||
|
|
|
||
|
|
var _reduce = require('./reduce');
|
||
|
|
|
||
|
|
var _reduce2 = _interopRequireDefault(_reduce);
|
||
|
|
|
||
|
|
var _wrapAsync = require('./internal/wrapAsync');
|
||
|
|
|
||
|
|
var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
|
||
|
|
|
||
|
|
var _arrayMap = require('lodash/_arrayMap');
|
||
|
|
|
||
|
|
var _arrayMap2 = _interopRequireDefault(_arrayMap);
|
||
|
|
|
||
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Version of the compose function that is more natural to read. Each function
|
||
|
|
* consumes the return value of the previous function. It is the equivalent of
|
||
|
|
* [compose]{@link module:ControlFlow.compose} with the arguments reversed.
|
||
|
|
*
|
||
|
|
* Each function is executed with the `this` binding of the composed function.
|
||
|
|
*
|
||
|
|
* @name seq
|
||
|
|
* @static
|
||
|
|
* @memberOf module:ControlFlow
|
||
|
|
* @method
|
||
|
|
* @see [async.compose]{@link module:ControlFlow.compose}
|
||
|
|
* @category Control Flow
|
||
|
|
* @param {...AsyncFunction} functions - the asynchronous functions to compose
|
||
|
|
* @returns {Function} a function that composes the `functions` in order
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* // Requires lodash (or underscore), express3 and dresende's orm2.
|
||
|
|
* // Part of an app, that fetches cats of the logged user.
|
||
|
|
* // This example uses `seq` function to avoid overnesting and error
|
||
|
|
* // handling clutter.
|
||
|
|
* app.get('/cats', function(request, response) {
|
||
|
|
* var User = request.models.User;
|
||
|
|
* async.seq(
|
||
|
|
* _.bind(User.get, User), // 'User.get' has signature (id, callback(err, data))
|
||
|
|
* function(user, fn) {
|
||
|
|
* user.getCats(fn); // 'getCats' has signature (callback(err, data))
|
||
|
|
* }
|
||
|
|
* )(req.session.user_id, function (err, cats) {
|
||
|
|
* if (err) {
|
||
|
|
* console.error(err);
|
||
|
|
* response.json({ status: 'error', message: err.message });
|
||
|
|
* } else {
|
||
|
|
* response.json({ status: 'ok', message: 'Cats found', data: cats });
|
||
|
|
* }
|
||
|
|
* });
|
||
|
|
* });
|
||
|
|
*/
|
||
|
|
function seq() /*...functions*/{
|
||
|
|
var _functions = (0, _arrayMap2.default)(arguments, _wrapAsync2.default);
|
||
|
|
return function () /*...args*/{
|
||
|
|
var args = (0, _slice2.default)(arguments);
|
||
|
|
var that = this;
|
||
|
|
|
||
|
|
var cb = args[args.length - 1];
|
||
|
|
if (typeof cb == 'function') {
|
||
|
|
args.pop();
|
||
|
|
} else {
|
||
|
|
cb = _noop2.default;
|
||
|
|
}
|
||
|
|
|
||
|
|
(0, _reduce2.default)(_functions, args, function (newargs, fn, cb) {
|
||
|
|
fn.apply(that, newargs.concat(function (err /*, ...nextargs*/) {
|
||
|
|
var nextargs = (0, _slice2.default)(arguments, 1);
|
||
|
|
cb(err, nextargs);
|
||
|
|
}));
|
||
|
|
}, function (err, results) {
|
||
|
|
cb.apply(that, [err].concat(results));
|
||
|
|
});
|
||
|
|
};
|
||
|
|
}
|
||
|
|
module.exports = exports['default'];
|