mirror of
https://github.com/ether/etherpad-lite.git
synced 2025-10-31 08:11:10 +01:00
691 lines
20 KiB
JavaScript
691 lines
20 KiB
JavaScript
/*global setTimeout: false, console: false */
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(function () {
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var async = {};
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// global on the server, window in the browser
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var root = this,
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previous_async = root.async;
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if (typeof module !== 'undefined' && module.exports) {
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module.exports = async;
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}
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else {
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root.async = async;
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}
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async.noConflict = function () {
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root.async = previous_async;
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return async;
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};
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//// cross-browser compatiblity functions ////
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var _forEach = function (arr, iterator) {
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if (arr.forEach) {
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return arr.forEach(iterator);
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}
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for (var i = 0; i < arr.length; i += 1) {
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iterator(arr[i], i, arr);
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}
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};
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var _map = function (arr, iterator) {
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if (arr.map) {
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return arr.map(iterator);
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}
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var results = [];
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_forEach(arr, function (x, i, a) {
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results.push(iterator(x, i, a));
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});
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return results;
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};
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var _reduce = function (arr, iterator, memo) {
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if (arr.reduce) {
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return arr.reduce(iterator, memo);
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}
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_forEach(arr, function (x, i, a) {
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memo = iterator(memo, x, i, a);
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});
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return memo;
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};
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var _keys = function (obj) {
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if (Object.keys) {
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return Object.keys(obj);
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}
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var keys = [];
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for (var k in obj) {
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if (obj.hasOwnProperty(k)) {
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keys.push(k);
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}
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}
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return keys;
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};
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var _indexOf = function (arr, item) {
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if (arr.indexOf) {
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return arr.indexOf(item);
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}
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for (var i = 0; i < arr.length; i += 1) {
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if (arr[i] === item) {
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return i;
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}
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}
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return -1;
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};
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//// exported async module functions ////
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//// nextTick implementation with browser-compatible fallback ////
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if (typeof process === 'undefined' || !(process.nextTick)) {
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async.nextTick = function (fn) {
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setTimeout(fn, 0);
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};
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}
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else {
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async.nextTick = process.nextTick;
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}
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async.forEach = function (arr, iterator, callback) {
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if (!arr.length) {
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return callback();
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}
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var completed = 0;
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_forEach(arr, function (x) {
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iterator(x, function (err) {
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if (err) {
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callback(err);
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callback = function () {};
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}
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else {
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completed += 1;
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if (completed === arr.length) {
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callback();
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}
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}
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});
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});
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};
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async.forEachSeries = function (arr, iterator, callback) {
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if (!arr.length) {
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return callback();
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}
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var completed = 0;
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var iterate = function () {
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iterator(arr[completed], function (err) {
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if (err) {
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callback(err);
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callback = function () {};
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}
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else {
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completed += 1;
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if (completed === arr.length) {
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callback();
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}
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else {
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iterate();
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}
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}
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});
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};
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iterate();
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};
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async.forEachLimit = function (arr, limit, iterator, callback) {
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if (!arr.length || limit <= 0) {
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return callback();
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}
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var completed = 0;
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var started = 0;
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var running = 0;
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(function replenish () {
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if (completed === arr.length) {
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return callback();
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}
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while (running < limit && started < arr.length) {
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iterator(arr[started], function (err) {
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if (err) {
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callback(err);
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callback = function () {};
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}
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else {
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completed += 1;
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running -= 1;
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if (completed === arr.length) {
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callback();
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}
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else {
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replenish();
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}
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}
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});
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started += 1;
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running += 1;
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}
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})();
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};
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var doParallel = function (fn) {
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return function () {
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var args = Array.prototype.slice.call(arguments);
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return fn.apply(null, [async.forEach].concat(args));
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};
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};
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var doSeries = function (fn) {
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return function () {
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var args = Array.prototype.slice.call(arguments);
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return fn.apply(null, [async.forEachSeries].concat(args));
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};
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};
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var _asyncMap = function (eachfn, arr, iterator, callback) {
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var results = [];
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arr = _map(arr, function (x, i) {
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return {index: i, value: x};
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});
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eachfn(arr, function (x, callback) {
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iterator(x.value, function (err, v) {
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results[x.index] = v;
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callback(err);
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});
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}, function (err) {
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callback(err, results);
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});
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};
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async.map = doParallel(_asyncMap);
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async.mapSeries = doSeries(_asyncMap);
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// reduce only has a series version, as doing reduce in parallel won't
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// work in many situations.
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async.reduce = function (arr, memo, iterator, callback) {
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async.forEachSeries(arr, function (x, callback) {
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iterator(memo, x, function (err, v) {
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memo = v;
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callback(err);
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});
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}, function (err) {
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callback(err, memo);
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});
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};
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// inject alias
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async.inject = async.reduce;
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// foldl alias
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async.foldl = async.reduce;
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async.reduceRight = function (arr, memo, iterator, callback) {
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var reversed = _map(arr, function (x) {
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return x;
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}).reverse();
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async.reduce(reversed, memo, iterator, callback);
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};
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// foldr alias
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async.foldr = async.reduceRight;
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var _filter = function (eachfn, arr, iterator, callback) {
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var results = [];
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arr = _map(arr, function (x, i) {
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return {index: i, value: x};
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});
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eachfn(arr, function (x, callback) {
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iterator(x.value, function (v) {
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if (v) {
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results.push(x);
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}
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callback();
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});
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}, function (err) {
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callback(_map(results.sort(function (a, b) {
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return a.index - b.index;
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}), function (x) {
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return x.value;
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}));
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});
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};
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async.filter = doParallel(_filter);
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async.filterSeries = doSeries(_filter);
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// select alias
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async.select = async.filter;
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async.selectSeries = async.filterSeries;
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var _reject = function (eachfn, arr, iterator, callback) {
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var results = [];
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arr = _map(arr, function (x, i) {
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return {index: i, value: x};
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});
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eachfn(arr, function (x, callback) {
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iterator(x.value, function (v) {
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if (!v) {
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results.push(x);
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}
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callback();
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});
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}, function (err) {
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callback(_map(results.sort(function (a, b) {
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return a.index - b.index;
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}), function (x) {
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return x.value;
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}));
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});
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};
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async.reject = doParallel(_reject);
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async.rejectSeries = doSeries(_reject);
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var _detect = function (eachfn, arr, iterator, main_callback) {
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eachfn(arr, function (x, callback) {
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iterator(x, function (result) {
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if (result) {
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main_callback(x);
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main_callback = function () {};
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}
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else {
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callback();
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}
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});
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}, function (err) {
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main_callback();
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});
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};
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async.detect = doParallel(_detect);
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async.detectSeries = doSeries(_detect);
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async.some = function (arr, iterator, main_callback) {
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async.forEach(arr, function (x, callback) {
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iterator(x, function (v) {
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if (v) {
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main_callback(true);
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main_callback = function () {};
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}
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callback();
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});
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}, function (err) {
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main_callback(false);
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});
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};
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// any alias
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async.any = async.some;
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async.every = function (arr, iterator, main_callback) {
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async.forEach(arr, function (x, callback) {
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iterator(x, function (v) {
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if (!v) {
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main_callback(false);
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main_callback = function () {};
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}
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callback();
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});
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}, function (err) {
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main_callback(true);
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});
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};
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// all alias
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async.all = async.every;
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async.sortBy = function (arr, iterator, callback) {
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async.map(arr, function (x, callback) {
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iterator(x, function (err, criteria) {
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if (err) {
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callback(err);
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}
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else {
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callback(null, {value: x, criteria: criteria});
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}
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});
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}, function (err, results) {
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if (err) {
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return callback(err);
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}
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else {
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var fn = function (left, right) {
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var a = left.criteria, b = right.criteria;
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return a < b ? -1 : a > b ? 1 : 0;
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};
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callback(null, _map(results.sort(fn), function (x) {
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return x.value;
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}));
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}
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});
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};
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async.auto = function (tasks, callback) {
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callback = callback || function () {};
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var keys = _keys(tasks);
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if (!keys.length) {
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return callback(null);
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}
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var results = {};
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var listeners = [];
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var addListener = function (fn) {
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listeners.unshift(fn);
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};
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var removeListener = function (fn) {
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for (var i = 0; i < listeners.length; i += 1) {
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if (listeners[i] === fn) {
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listeners.splice(i, 1);
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return;
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}
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}
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};
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var taskComplete = function () {
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_forEach(listeners, function (fn) {
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fn();
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});
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};
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addListener(function () {
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if (_keys(results).length === keys.length) {
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callback(null, results);
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}
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});
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_forEach(keys, function (k) {
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var task = (tasks[k] instanceof Function) ? [tasks[k]]: tasks[k];
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var taskCallback = function (err) {
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if (err) {
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callback(err);
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// stop subsequent errors hitting callback multiple times
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callback = function () {};
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}
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else {
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var args = Array.prototype.slice.call(arguments, 1);
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if (args.length <= 1) {
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args = args[0];
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}
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results[k] = args;
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taskComplete();
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}
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};
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var requires = task.slice(0, Math.abs(task.length - 1)) || [];
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var ready = function () {
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return _reduce(requires, function (a, x) {
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return (a && results.hasOwnProperty(x));
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}, true);
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};
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if (ready()) {
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task[task.length - 1](taskCallback, results);
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}
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else {
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var listener = function () {
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if (ready()) {
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removeListener(listener);
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task[task.length - 1](taskCallback, results);
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}
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};
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addListener(listener);
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}
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});
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};
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async.waterfall = function (tasks, callback) {
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if (!tasks.length) {
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return callback();
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}
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callback = callback || function () {};
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var wrapIterator = function (iterator) {
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return function (err) {
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if (err) {
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callback(err);
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callback = function () {};
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}
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else {
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var args = Array.prototype.slice.call(arguments, 1);
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var next = iterator.next();
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if (next) {
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args.push(wrapIterator(next));
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}
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else {
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args.push(callback);
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}
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async.nextTick(function () {
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iterator.apply(null, args);
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});
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}
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};
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};
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wrapIterator(async.iterator(tasks))();
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};
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async.parallel = function (tasks, callback) {
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callback = callback || function () {};
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if (tasks.constructor === Array) {
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async.map(tasks, function (fn, callback) {
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if (fn) {
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fn(function (err) {
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var args = Array.prototype.slice.call(arguments, 1);
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if (args.length <= 1) {
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args = args[0];
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}
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callback.call(null, err, args);
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});
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}
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}, callback);
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}
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else {
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var results = {};
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async.forEach(_keys(tasks), function (k, callback) {
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tasks[k](function (err) {
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var args = Array.prototype.slice.call(arguments, 1);
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if (args.length <= 1) {
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args = args[0];
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}
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results[k] = args;
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callback(err);
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});
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}, function (err) {
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callback(err, results);
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});
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}
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};
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async.series = function (tasks, callback) {
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callback = callback || function () {};
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if (tasks.constructor === Array) {
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async.mapSeries(tasks, function (fn, callback) {
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if (fn) {
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fn(function (err) {
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var args = Array.prototype.slice.call(arguments, 1);
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if (args.length <= 1) {
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args = args[0];
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}
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callback.call(null, err, args);
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});
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}
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}, callback);
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}
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else {
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var results = {};
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async.forEachSeries(_keys(tasks), function (k, callback) {
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tasks[k](function (err) {
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var args = Array.prototype.slice.call(arguments, 1);
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if (args.length <= 1) {
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args = args[0];
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}
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results[k] = args;
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callback(err);
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});
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}, function (err) {
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callback(err, results);
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});
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}
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};
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async.iterator = function (tasks) {
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var makeCallback = function (index) {
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var fn = function () {
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if (tasks.length) {
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tasks[index].apply(null, arguments);
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}
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return fn.next();
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};
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fn.next = function () {
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return (index < tasks.length - 1) ? makeCallback(index + 1): null;
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};
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return fn;
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};
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return makeCallback(0);
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};
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async.apply = function (fn) {
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var args = Array.prototype.slice.call(arguments, 1);
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return function () {
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return fn.apply(
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null, args.concat(Array.prototype.slice.call(arguments))
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);
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};
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};
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var _concat = function (eachfn, arr, fn, callback) {
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var r = [];
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eachfn(arr, function (x, cb) {
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fn(x, function (err, y) {
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r = r.concat(y || []);
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cb(err);
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});
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}, function (err) {
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callback(err, r);
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});
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};
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async.concat = doParallel(_concat);
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async.concatSeries = doSeries(_concat);
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async.whilst = function (test, iterator, callback) {
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if (test()) {
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iterator(function (err) {
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if (err) {
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return callback(err);
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}
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async.whilst(test, iterator, callback);
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});
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}
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else {
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callback();
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}
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};
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async.until = function (test, iterator, callback) {
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if (!test()) {
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iterator(function (err) {
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if (err) {
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return callback(err);
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}
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async.until(test, iterator, callback);
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});
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}
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else {
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callback();
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}
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};
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async.queue = function (worker, concurrency) {
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var workers = 0;
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var q = {
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tasks: [],
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concurrency: concurrency,
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saturated: null,
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empty: null,
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drain: null,
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push: function (data, callback) {
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q.tasks.push({data: data, callback: callback});
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if(q.saturated && q.tasks.length == concurrency) q.saturated();
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async.nextTick(q.process);
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},
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process: function () {
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if (workers < q.concurrency && q.tasks.length) {
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var task = q.tasks.shift();
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if(q.empty && q.tasks.length == 0) q.empty();
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workers += 1;
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worker(task.data, function () {
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workers -= 1;
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if (task.callback) {
|
|
task.callback.apply(task, arguments);
|
|
}
|
|
if(q.drain && q.tasks.length + workers == 0) q.drain();
|
|
q.process();
|
|
});
|
|
}
|
|
},
|
|
length: function () {
|
|
return q.tasks.length;
|
|
},
|
|
running: function () {
|
|
return workers;
|
|
}
|
|
};
|
|
return q;
|
|
};
|
|
|
|
var _console_fn = function (name) {
|
|
return function (fn) {
|
|
var args = Array.prototype.slice.call(arguments, 1);
|
|
fn.apply(null, args.concat([function (err) {
|
|
var args = Array.prototype.slice.call(arguments, 1);
|
|
if (typeof console !== 'undefined') {
|
|
if (err) {
|
|
if (console.error) {
|
|
console.error(err);
|
|
}
|
|
}
|
|
else if (console[name]) {
|
|
_forEach(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 = {};
|
|
hasher = hasher || function (x) {
|
|
return x;
|
|
};
|
|
var memoized = function () {
|
|
var args = Array.prototype.slice.call(arguments);
|
|
var callback = args.pop();
|
|
var key = hasher.apply(null, args);
|
|
if (key in memo) {
|
|
callback.apply(null, memo[key]);
|
|
}
|
|
else if (key in queues) {
|
|
queues[key].push(callback);
|
|
}
|
|
else {
|
|
queues[key] = [callback];
|
|
fn.apply(null, args.concat([function () {
|
|
memo[key] = arguments;
|
|
var q = queues[key];
|
|
delete queues[key];
|
|
for (var i = 0, l = q.length; i < l; i++) {
|
|
q[i].apply(null, arguments);
|
|
}
|
|
}]));
|
|
}
|
|
};
|
|
memoized.unmemoized = fn;
|
|
return memoized;
|
|
};
|
|
|
|
async.unmemoize = function (fn) {
|
|
return function () {
|
|
return (fn.unmemoized || fn).apply(null, arguments);
|
|
}
|
|
};
|
|
|
|
}());
|