79 lines
2.6 KiB
JavaScript
79 lines
2.6 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
Object.defineProperty(exports, "__esModule", {
|
||
|
|
value: true
|
||
|
|
});
|
||
|
|
exports.default = seq;
|
||
|
|
|
||
|
|
var _reduce = require('./reduce.js');
|
||
|
|
|
||
|
|
var _reduce2 = _interopRequireDefault(_reduce);
|
||
|
|
|
||
|
|
var _wrapAsync = require('./internal/wrapAsync.js');
|
||
|
|
|
||
|
|
var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
|
||
|
|
|
||
|
|
var _promiseCallback = require('./internal/promiseCallback.js');
|
||
|
|
|
||
|
|
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(
|
||
|
|
* User.get.bind(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 = functions.map(_wrapAsync2.default);
|
||
|
|
return function (...args) {
|
||
|
|
var that = this;
|
||
|
|
|
||
|
|
var cb = args[args.length - 1];
|
||
|
|
if (typeof cb == 'function') {
|
||
|
|
args.pop();
|
||
|
|
} else {
|
||
|
|
cb = (0, _promiseCallback.promiseCallback)();
|
||
|
|
}
|
||
|
|
|
||
|
|
(0, _reduce2.default)(_functions, args, (newargs, fn, iterCb) => {
|
||
|
|
fn.apply(that, newargs.concat((err, ...nextargs) => {
|
||
|
|
iterCb(err, nextargs);
|
||
|
|
}));
|
||
|
|
}, (err, results) => cb(err, ...results));
|
||
|
|
|
||
|
|
return cb[_promiseCallback.PROMISE_SYMBOL];
|
||
|
|
};
|
||
|
|
}
|
||
|
|
module.exports = exports['default'];
|