work.suroh.tk/node_modules/async/lib/async.js

1266 lines
38 KiB
JavaScript

/*!
* async
* https://github.com/caolan/async
*
* Copyright 2010-2014 Caolan McMahon
* Released under the MIT license
*/
(function () {
var async = {};
function noop() {}
function identity(v) {
return v;
}
function toBool(v) {
return !!v;
}
function notId(v) {
return !v;
}
// global on the server, window in the browser
var previous_async;
// Establish the root object, `window` (`self`) in the browser, `global`
// on the server, or `this` in some virtual machines. We use `self`
// instead of `window` for `WebWorker` support.
var root = typeof self === 'object' && self.self === self && self ||
typeof global === 'object' && global.global === global && global ||
this;
if (root != null) {
previous_async = root.async;
}
async.noConflict = function () {
root.async = previous_async;
return async;
};
function only_once(fn) {
return function() {
if (fn === null) throw new Error("Callback was already called.");
fn.apply(this, arguments);
fn = null;
};
}
function _once(fn) {
return function() {
if (fn === null) return;
fn.apply(this, arguments);
fn = null;
};
}
//// cross-browser compatiblity functions ////
var _toString = Object.prototype.toString;
var _isArray = Array.isArray || function (obj) {
return _toString.call(obj) === '[object Array]';
};
// Ported from underscore.js isObject
var _isObject = function(obj) {
var type = typeof obj;
return type === 'function' || type === 'object' && !!obj;
};
function _isArrayLike(arr) {
return _isArray(arr) || (
// has a positive integer length property
typeof arr.length === "number" &&
arr.length >= 0 &&
arr.length % 1 === 0
);
}
function _arrayEach(arr, iterator) {
var index = -1,
length = arr.length;
while (++index < length) {
iterator(arr[index], index, arr);
}
}
function _map(arr, iterator) {
var index = -1,
length = arr.length,
result = Array(length);
while (++index < length) {
result[index] = iterator(arr[index], index, arr);
}
return result;
}
function _range(count) {
return _map(Array(count), function (v, i) { return i; });
}
function _reduce(arr, iterator, memo) {
_arrayEach(arr, function (x, i, a) {
memo = iterator(memo, x, i, a);
});
return memo;
}
function _forEachOf(object, iterator) {
_arrayEach(_keys(object), function (key) {
iterator(object[key], key);
});
}
function _indexOf(arr, item) {
for (var i = 0; i < arr.length; i++) {
if (arr[i] === item) return i;
}
return -1;
}
var _keys = Object.keys || function (obj) {
var keys = [];
for (var k in obj) {
if (obj.hasOwnProperty(k)) {
keys.push(k);
}
}
return keys;
};
function _keyIterator(coll) {
var i = -1;
var len;
var keys;
if (_isArrayLike(coll)) {
len = coll.length;
return function next() {
i++;
return i < len ? i : null;
};
} else {
keys = _keys(coll);
len = keys.length;
return function next() {
i++;
return i < len ? keys[i] : null;
};
}
}
// Similar to ES6's rest param (http://ariya.ofilabs.com/2013/03/es6-and-rest-parameter.html)
// This accumulates the arguments passed into an array, after a given index.
// From underscore.js (https://github.com/jashkenas/underscore/pull/2140).
function _restParam(func, startIndex) {
startIndex = startIndex == null ? func.length - 1 : +startIndex;
return function() {
var length = Math.max(arguments.length - startIndex, 0);
var rest = Array(length);
for (var index = 0; index < length; index++) {
rest[index] = arguments[index + startIndex];
}
switch (startIndex) {
case 0: return func.call(this, rest);
case 1: return func.call(this, arguments[0], rest);
}
// Currently unused but handle cases outside of the switch statement:
// var args = Array(startIndex + 1);
// for (index = 0; index < startIndex; index++) {
// args[index] = arguments[index];
// }
// args[startIndex] = rest;
// return func.apply(this, args);
};
}
function _withoutIndex(iterator) {
return function (value, index, callback) {
return iterator(value, callback);
};
}
//// exported async module functions ////
//// nextTick implementation with browser-compatible fallback ////
// capture the global reference to guard against fakeTimer mocks
var _setImmediate = typeof setImmediate === 'function' && setImmediate;
var _delay = _setImmediate ? function(fn) {
// not a direct alias for IE10 compatibility
_setImmediate(fn);
} : function(fn) {
setTimeout(fn, 0);
};
if (typeof process === 'object' && typeof process.nextTick === 'function') {
async.nextTick = process.nextTick;
} else {
async.nextTick = _delay;
}
async.setImmediate = _setImmediate ? _delay : async.nextTick;
async.forEach =
async.each = function (arr, iterator, callback) {
return async.eachOf(arr, _withoutIndex(iterator), callback);
};
async.forEachSeries =
async.eachSeries = function (arr, iterator, callback) {
return async.eachOfSeries(arr, _withoutIndex(iterator), callback);
};
async.forEachLimit =
async.eachLimit = function (arr, limit, iterator, callback) {
return _eachOfLimit(limit)(arr, _withoutIndex(iterator), callback);
};
async.forEachOf =
async.eachOf = function (object, iterator, callback) {
callback = _once(callback || noop);
object = object || [];
var iter = _keyIterator(object);
var key, completed = 0;
while ((key = iter()) != null) {
completed += 1;
iterator(object[key], key, only_once(done));
}
if (completed === 0) callback(null);
function done(err) {
completed--;
if (err) {
callback(err);
}
// Check key is null in case iterator isn't exhausted
// and done resolved synchronously.
else if (key === null && completed <= 0) {
callback(null);
}
}
};
async.forEachOfSeries =
async.eachOfSeries = function (obj, iterator, callback) {
callback = _once(callback || noop);
obj = obj || [];
var nextKey = _keyIterator(obj);
var key = nextKey();
function iterate() {
var sync = true;
if (key === null) {
return callback(null);
}
iterator(obj[key], key, only_once(function (err) {
if (err) {
callback(err);
}
else {
key = nextKey();
if (key === null) {
return callback(null);
} else {
if (sync) {
async.setImmediate(iterate);
} else {
iterate();
}
}
}
}));
sync = false;
}
iterate();
};
async.forEachOfLimit =
async.eachOfLimit = function (obj, limit, iterator, callback) {
_eachOfLimit(limit)(obj, iterator, callback);
};
function _eachOfLimit(limit) {
return function (obj, iterator, callback) {
callback = _once(callback || noop);
obj = obj || [];
var nextKey = _keyIterator(obj);
if (limit <= 0) {
return callback(null);
}
var done = false;
var running = 0;
var errored = false;
(function replenish () {
if (done && running <= 0) {
return callback(null);
}
while (running < limit && !errored) {
var key = nextKey();
if (key === null) {
done = true;
if (running <= 0) {
callback(null);
}
return;
}
running += 1;
iterator(obj[key], key, only_once(function (err) {
running -= 1;
if (err) {
callback(err);
errored = true;
}
else {
replenish();
}
}));
}
})();
};
}
function doParallel(fn) {
return function (obj, iterator, callback) {
return fn(async.eachOf, obj, iterator, callback);
};
}
function doParallelLimit(fn) {
return function (obj, limit, iterator, callback) {
return fn(_eachOfLimit(limit), obj, iterator, callback);
};
}
function doSeries(fn) {
return function (obj, iterator, callback) {
return fn(async.eachOfSeries, obj, iterator, callback);
};
}
function _asyncMap(eachfn, arr, iterator, callback) {
callback = _once(callback || noop);
arr = arr || [];
var results = _isArrayLike(arr) ? [] : {};
eachfn(arr, function (value, index, callback) {
iterator(value, function (err, v) {
results[index] = v;
callback(err);
});
}, function (err) {
callback(err, results);
});
}
async.map = doParallel(_asyncMap);
async.mapSeries = doSeries(_asyncMap);
async.mapLimit = doParallelLimit(_asyncMap);
// reduce only has a series version, as doing reduce in parallel won't
// work in many situations.
async.inject =
async.foldl =
async.reduce = function (arr, memo, iterator, callback) {
async.eachOfSeries(arr, function (x, i, callback) {
iterator(memo, x, function (err, v) {
memo = v;
callback(err);
});
}, function (err) {
callback(err, memo);
});
};
async.foldr =
async.reduceRight = function (arr, memo, iterator, callback) {
var reversed = _map(arr, identity).reverse();
async.reduce(reversed, memo, iterator, callback);
};
async.transform = function (arr, memo, iterator, callback) {
if (arguments.length === 3) {
callback = iterator;
iterator = memo;
memo = _isArray(arr) ? [] : {};
}
async.eachOf(arr, function(v, k, cb) {
iterator(memo, v, k, cb);
}, function(err) {
callback(err, memo);
});
};
function _filter(eachfn, arr, iterator, callback) {
var results = [];
eachfn(arr, function (x, index, callback) {
iterator(x, function (v) {
if (v) {
results.push({index: index, value: x});
}
callback();
});
}, function () {
callback(_map(results.sort(function (a, b) {
return a.index - b.index;
}), function (x) {
return x.value;
}));
});
}
async.select =
async.filter = doParallel(_filter);
async.selectLimit =
async.filterLimit = doParallelLimit(_filter);
async.selectSeries =
async.filterSeries = doSeries(_filter);
function _reject(eachfn, arr, iterator, callback) {
_filter(eachfn, arr, function(value, cb) {
iterator(value, function(v) {
cb(!v);
});
}, callback);
}
async.reject = doParallel(_reject);
async.rejectLimit = doParallelLimit(_reject);
async.rejectSeries = doSeries(_reject);
function _createTester(eachfn, check, getResult) {
return function(arr, limit, iterator, cb) {
function done() {
if (cb) cb(getResult(false, void 0));
}
function iteratee(x, _, callback) {
if (!cb) return callback();
iterator(x, function (v) {
if (cb && check(v)) {
cb(getResult(true, x));
cb = iterator = false;
}
callback();
});
}
if (arguments.length > 3) {
eachfn(arr, limit, iteratee, done);
} else {
cb = iterator;
iterator = limit;
eachfn(arr, iteratee, done);
}
};
}
async.any =
async.some = _createTester(async.eachOf, toBool, identity);
async.someLimit = _createTester(async.eachOfLimit, toBool, identity);
async.all =
async.every = _createTester(async.eachOf, notId, notId);
async.everyLimit = _createTester(async.eachOfLimit, notId, notId);
function _findGetResult(v, x) {
return x;
}
async.detect = _createTester(async.eachOf, identity, _findGetResult);
async.detectSeries = _createTester(async.eachOfSeries, identity, _findGetResult);
async.detectLimit = _createTester(async.eachOfLimit, identity, _findGetResult);
async.sortBy = function (arr, iterator, callback) {
async.map(arr, function (x, callback) {
iterator(x, function (err, criteria) {
if (err) {
callback(err);
}
else {
callback(null, {value: x, criteria: criteria});
}
});
}, function (err, results) {
if (err) {
return callback(err);
}
else {
callback(null, _map(results.sort(comparator), function (x) {
return x.value;
}));
}
});
function comparator(left, right) {
var a = left.criteria, b = right.criteria;
return a < b ? -1 : a > b ? 1 : 0;
}
};
async.auto = function (tasks, concurrency, callback) {
if (typeof arguments[1] === 'function') {
// concurrency is optional, shift the args.
callback = concurrency;
concurrency = null;
}
callback = _once(callback || noop);
var keys = _keys(tasks);
var remainingTasks = keys.length;
if (!remainingTasks) {
return callback(null);
}
if (!concurrency) {
concurrency = remainingTasks;
}
var results = {};
var runningTasks = 0;
var hasError = false;
var listeners = [];
function addListener(fn) {
listeners.unshift(fn);
}
function removeListener(fn) {
var idx = _indexOf(listeners, fn);
if (idx >= 0) listeners.splice(idx, 1);
}
function taskComplete() {
remainingTasks--;
_arrayEach(listeners.slice(0), function (fn) {
fn();
});
}
addListener(function () {
if (!remainingTasks) {
callback(null, results);
}
});
_arrayEach(keys, function (k) {
if (hasError) return;
var task = _isArray(tasks[k]) ? tasks[k]: [tasks[k]];
var taskCallback = _restParam(function(err, args) {
runningTasks--;
if (args.length <= 1) {
args = args[0];
}
if (err) {
var safeResults = {};
_forEachOf(results, function(val, rkey) {
safeResults[rkey] = val;
});
safeResults[k] = args;
hasError = true;
callback(err, safeResults);
}
else {
results[k] = args;
async.setImmediate(taskComplete);
}
});
var requires = task.slice(0, task.length - 1);
// prevent dead-locks
var len = requires.length;
var dep;
while (len--) {
if (!(dep = tasks[requires[len]])) {
throw new Error('Has nonexistent dependency in ' + requires.join(', '));
}
if (_isArray(dep) && _indexOf(dep, k) >= 0) {
throw new Error('Has cyclic dependencies');
}
}
function ready() {
return runningTasks < concurrency && _reduce(requires, function (a, x) {
return (a && results.hasOwnProperty(x));
}, true) && !results.hasOwnProperty(k);
}
if (ready()) {
runningTasks++;
task[task.length - 1](taskCallback, results);
}
else {
addListener(listener);
}
function listener() {
if (ready()) {
runningTasks++;
removeListener(listener);
task[task.length - 1](taskCallback, results);
}
}
});
};
async.retry = function(times, task, callback) {
var DEFAULT_TIMES = 5;
var DEFAULT_INTERVAL = 0;
var attempts = [];
var opts = {
times: DEFAULT_TIMES,
interval: DEFAULT_INTERVAL
};
function parseTimes(acc, t){
if(typeof t === 'number'){
acc.times = parseInt(t, 10) || DEFAULT_TIMES;
} else if(typeof t === 'object'){
acc.times = parseInt(t.times, 10) || DEFAULT_TIMES;
acc.interval = parseInt(t.interval, 10) || DEFAULT_INTERVAL;
} else {
throw new Error('Unsupported argument type for \'times\': ' + typeof t);
}
}
var length = arguments.length;
if (length < 1 || length > 3) {
throw new Error('Invalid arguments - must be either (task), (task, callback), (times, task) or (times, task, callback)');
} else if (length <= 2 && typeof times === 'function') {
callback = task;
task = times;
}
if (typeof times !== 'function') {
parseTimes(opts, times);
}
opts.callback = callback;
opts.task = task;
function wrappedTask(wrappedCallback, wrappedResults) {
function retryAttempt(task, finalAttempt) {
return function(seriesCallback) {
task(function(err, result){
seriesCallback(!err || finalAttempt, {err: err, result: result});
}, wrappedResults);
};
}
function retryInterval(interval){
return function(seriesCallback){
setTimeout(function(){
seriesCallback(null);
}, interval);
};
}
while (opts.times) {
var finalAttempt = !(opts.times-=1);
attempts.push(retryAttempt(opts.task, finalAttempt));
if(!finalAttempt && opts.interval > 0){
attempts.push(retryInterval(opts.interval));
}
}
async.series(attempts, function(done, data){
data = data[data.length - 1];
(wrappedCallback || opts.callback)(data.err, data.result);
});
}
// If a callback is passed, run this as a controll flow
return opts.callback ? wrappedTask() : wrappedTask;
};
async.waterfall = function (tasks, callback) {
callback = _once(callback || noop);
if (!_isArray(tasks)) {
var err = new Error('First argument to waterfall must be an array of functions');
return callback(err);
}
if (!tasks.length) {
return callback();
}
function wrapIterator(iterator) {
return _restParam(function (err, args) {
if (err) {
callback.apply(null, [err].concat(args));
}
else {
var next = iterator.next();
if (next) {
args.push(wrapIterator(next));
}
else {
args.push(callback);
}
ensureAsync(iterator).apply(null, args);
}
});
}
wrapIterator(async.iterator(tasks))();
};
function _parallel(eachfn, tasks, callback) {
callback = callback || noop;
var results = _isArrayLike(tasks) ? [] : {};
eachfn(tasks, function (task, key, callback) {
task(_restParam(function (err, args) {
if (args.length <= 1) {
args = args[0];
}
results[key] = args;
callback(err);
}));
}, function (err) {
callback(err, results);
});
}
async.parallel = function (tasks, callback) {
_parallel(async.eachOf, tasks, callback);
};
async.parallelLimit = function(tasks, limit, callback) {
_parallel(_eachOfLimit(limit), tasks, callback);
};
async.series = function(tasks, callback) {
_parallel(async.eachOfSeries, tasks, callback);
};
async.iterator = function (tasks) {
function makeCallback(index) {
function fn() {
if (tasks.length) {
tasks[index].apply(null, arguments);
}
return fn.next();
}
fn.next = function () {
return (index < tasks.length - 1) ? makeCallback(index + 1): null;
};
return fn;
}
return makeCallback(0);
};
async.apply = _restParam(function (fn, args) {
return _restParam(function (callArgs) {
return fn.apply(
null, args.concat(callArgs)
);
});
});
function _concat(eachfn, arr, fn, callback) {
var result = [];
eachfn(arr, function (x, index, cb) {
fn(x, function (err, y) {
result = result.concat(y || []);
cb(err);
});
}, function (err) {
callback(err, result);
});
}
async.concat = doParallel(_concat);
async.concatSeries = doSeries(_concat);
async.whilst = function (test, iterator, callback) {
callback = callback || noop;
if (test()) {
var next = _restParam(function(err, args) {
if (err) {
callback(err);
} else if (test.apply(this, args)) {
iterator(next);
} else {
callback.apply(null, [null].concat(args));
}
});
iterator(next);
} else {
callback(null);
}
};
async.doWhilst = function (iterator, test, callback) {
var calls = 0;
return async.whilst(function() {
return ++calls <= 1 || test.apply(this, arguments);
}, iterator, callback);
};
async.until = function (test, iterator, callback) {
return async.whilst(function() {
return !test.apply(this, arguments);
}, iterator, callback);
};
async.doUntil = function (iterator, test, callback) {
return async.doWhilst(iterator, function() {
return !test.apply(this, arguments);
}, callback);
};
async.during = function (test, iterator, callback) {
callback = callback || noop;
var next = _restParam(function(err, args) {
if (err) {
callback(err);
} else {
args.push(check);
test.apply(this, args);
}
});
var check = function(err, truth) {
if (err) {
callback(err);
} else if (truth) {
iterator(next);
} else {
callback(null);
}
};
test(check);
};
async.doDuring = function (iterator, test, callback) {
var calls = 0;
async.during(function(next) {
if (calls++ < 1) {
next(null, true);
} else {
test.apply(this, arguments);
}
}, iterator, callback);
};
function _queue(worker, concurrency, payload) {
if (concurrency == null) {
concurrency = 1;
}
else if(concurrency === 0) {
throw new Error('Concurrency must not be zero');
}
function _insert(q, data, pos, callback) {
if (callback != null && typeof callback !== "function") {
throw new Error("task callback must be a function");
}
q.started = true;
if (!_isArray(data)) {
data = [data];
}
if(data.length === 0 && q.idle()) {
// call drain immediately if there are no tasks
return async.setImmediate(function() {
q.drain();
});
}
_arrayEach(data, function(task) {
var item = {
data: task,
callback: callback || noop
};
if (pos) {
q.tasks.unshift(item);
} else {
q.tasks.push(item);
}
if (q.tasks.length === q.concurrency) {
q.saturated();
}
});
async.setImmediate(q.process);
}
function _next(q, tasks) {
return function(){
workers -= 1;
var removed = false;
var args = arguments;
_arrayEach(tasks, function (task) {
_arrayEach(workersList, function (worker, index) {
if (worker === task && !removed) {
workersList.splice(index, 1);
removed = true;
}
});
task.callback.apply(task, args);
});
if (q.tasks.length + workers === 0) {
q.drain();
}
q.process();
};
}
var workers = 0;
var workersList = [];
var q = {
tasks: [],
concurrency: concurrency,
payload: payload,
saturated: noop,
empty: noop,
drain: noop,
started: false,
paused: false,
push: function (data, callback) {
_insert(q, data, false, callback);
},
kill: function () {
q.drain = noop;
q.tasks = [];
},
unshift: function (data, callback) {
_insert(q, data, true, callback);
},
process: function () {
while(!q.paused && workers < q.concurrency && q.tasks.length){
var tasks = q.payload ?
q.tasks.splice(0, q.payload) :
q.tasks.splice(0, q.tasks.length);
var data = _map(tasks, function (task) {
return task.data;
});
if (q.tasks.length === 0) {
q.empty();
}
workers += 1;
workersList.push(tasks[0]);
var cb = only_once(_next(q, tasks));
worker(data, cb);
}
},
length: function () {
return q.tasks.length;
},
running: function () {
return workers;
},
workersList: function () {
return workersList;
},
idle: function() {
return q.tasks.length + workers === 0;
},
pause: function () {
q.paused = true;
},
resume: function () {
if (q.paused === false) { return; }
q.paused = false;
var resumeCount = Math.min(q.concurrency, q.tasks.length);
// Need to call q.process once per concurrent
// worker to preserve full concurrency after pause
for (var w = 1; w <= resumeCount; w++) {
async.setImmediate(q.process);
}
}
};
return q;
}
async.queue = function (worker, concurrency) {
var q = _queue(function (items, cb) {
worker(items[0], cb);
}, concurrency, 1);
return q;
};
async.priorityQueue = function (worker, concurrency) {
function _compareTasks(a, b){
return a.priority - b.priority;
}
function _binarySearch(sequence, item, compare) {
var beg = -1,
end = sequence.length - 1;
while (beg < end) {
var mid = beg + ((end - beg + 1) >>> 1);
if (compare(item, sequence[mid]) >= 0) {
beg = mid;
} else {
end = mid - 1;
}
}
return beg;
}
function _insert(q, data, priority, callback) {
if (callback != null && typeof callback !== "function") {
throw new Error("task callback must be a function");
}
q.started = true;
if (!_isArray(data)) {
data = [data];
}
if(data.length === 0) {
// call drain immediately if there are no tasks
return async.setImmediate(function() {
q.drain();
});
}
_arrayEach(data, function(task) {
var item = {
data: task,
priority: priority,
callback: typeof callback === 'function' ? callback : noop
};
q.tasks.splice(_binarySearch(q.tasks, item, _compareTasks) + 1, 0, item);
if (q.tasks.length === q.concurrency) {
q.saturated();
}
async.setImmediate(q.process);
});
}
// Start with a normal queue
var q = async.queue(worker, concurrency);
// Override push to accept second parameter representing priority
q.push = function (data, priority, callback) {
_insert(q, data, priority, callback);
};
// Remove unshift function
delete q.unshift;
return q;
};
async.cargo = function (worker, payload) {
return _queue(worker, 1, payload);
};
function _console_fn(name) {
return _restParam(function (fn, args) {
fn.apply(null, args.concat([_restParam(function (err, args) {
if (typeof console === 'object') {
if (err) {
if (console.error) {
console.error(err);
}
}
else if (console[name]) {
_arrayEach(args, function (x) {
console[name](x);
});
}
}
})]));
});
}
async.log = _console_fn('log');
async.dir = _console_fn('dir');
/*async.info = _console_fn('info');
async.warn = _console_fn('warn');
async.error = _console_fn('error');*/
async.memoize = function (fn, hasher) {
var memo = {};
var queues = {};
var has = Object.prototype.hasOwnProperty;
hasher = hasher || identity;
var memoized = _restParam(function memoized(args) {
var callback = args.pop();
var key = hasher.apply(null, args);
if (has.call(memo, key)) {
async.setImmediate(function () {
callback.apply(null, memo[key]);
});
}
else if (has.call(queues, key)) {
queues[key].push(callback);
}
else {
queues[key] = [callback];
fn.apply(null, args.concat([_restParam(function (args) {
memo[key] = args;
var q = queues[key];
delete queues[key];
for (var i = 0, l = q.length; i < l; i++) {
q[i].apply(null, args);
}
})]));
}
});
memoized.memo = memo;
memoized.unmemoized = fn;
return memoized;
};
async.unmemoize = function (fn) {
return function () {
return (fn.unmemoized || fn).apply(null, arguments);
};
};
function _times(mapper) {
return function (count, iterator, callback) {
mapper(_range(count), iterator, callback);
};
}
async.times = _times(async.map);
async.timesSeries = _times(async.mapSeries);
async.timesLimit = function (count, limit, iterator, callback) {
return async.mapLimit(_range(count), limit, iterator, callback);
};
async.seq = function (/* functions... */) {
var fns = arguments;
return _restParam(function (args) {
var that = this;
var callback = args[args.length - 1];
if (typeof callback == 'function') {
args.pop();
} else {
callback = noop;
}
async.reduce(fns, args, function (newargs, fn, cb) {
fn.apply(that, newargs.concat([_restParam(function (err, nextargs) {
cb(err, nextargs);
})]));
},
function (err, results) {
callback.apply(that, [err].concat(results));
});
});
};
async.compose = function (/* functions... */) {
return async.seq.apply(null, Array.prototype.reverse.call(arguments));
};
function _applyEach(eachfn) {
return _restParam(function(fns, args) {
var go = _restParam(function(args) {
var that = this;
var callback = args.pop();
return eachfn(fns, function (fn, _, cb) {
fn.apply(that, args.concat([cb]));
},
callback);
});
if (args.length) {
return go.apply(this, args);
}
else {
return go;
}
});
}
async.applyEach = _applyEach(async.eachOf);
async.applyEachSeries = _applyEach(async.eachOfSeries);
async.forever = function (fn, callback) {
var done = only_once(callback || noop);
var task = ensureAsync(fn);
function next(err) {
if (err) {
return done(err);
}
task(next);
}
next();
};
function ensureAsync(fn) {
return _restParam(function (args) {
var callback = args.pop();
args.push(function () {
var innerArgs = arguments;
if (sync) {
async.setImmediate(function () {
callback.apply(null, innerArgs);
});
} else {
callback.apply(null, innerArgs);
}
});
var sync = true;
fn.apply(this, args);
sync = false;
});
}
async.ensureAsync = ensureAsync;
async.constant = _restParam(function(values) {
var args = [null].concat(values);
return function (callback) {
return callback.apply(this, args);
};
});
async.wrapSync =
async.asyncify = function asyncify(func) {
return _restParam(function (args) {
var callback = args.pop();
var result;
try {
result = func.apply(this, args);
} catch (e) {
return callback(e);
}
// if result is Promise object
if (_isObject(result) && typeof result.then === "function") {
result.then(function(value) {
callback(null, value);
})["catch"](function(err) {
callback(err.message ? err : new Error(err));
});
} else {
callback(null, result);
}
});
};
// Node.js
if (typeof module === 'object' && module.exports) {
module.exports = async;
}
// AMD / RequireJS
else if (typeof define === 'function' && define.amd) {
define([], function () {
return async;
});
}
// included directly via <script> tag
else {
root.async = async;
}
}());