85 lines
2.0 KiB
JavaScript
85 lines
2.0 KiB
JavaScript
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/* jshint node: true */
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"use strict";
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var lib = {};
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var nextTick = process.nextTick || global.setImmediate || global.setTimeout;
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lib.nextTick = function (func) {
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nextTick(func);
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};
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lib.parallel = function (tasks, done) {
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var results = [];
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var errs = [];
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var length = 0;
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var doneLength = 0;
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function doneIt(ix, err, result) {
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if (err) {
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errs[ix] = err;
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} else {
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results[ix] = result;
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}
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doneLength += 1;
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if (doneLength >= length) {
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done(errs.length > 0 ? errs : errs, results);
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}
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}
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Object.keys(tasks).forEach(function (key) {
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length += 1;
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var task = tasks[key];
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lib.nextTick(function () {
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task(doneIt.bind(null, key), 1);
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});
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});
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};
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lib.promisify = function (func) {
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return new Promise(function (resolve, reject) {
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func(function (err, data) {
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if (err) {
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if (!err instanceof Error) {
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err = new Error(err);
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}
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reject(err);
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return;
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}
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resolve(data);
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});
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});
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};
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lib.iterate = function (args, func, callback) {
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var errors = [];
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var f = function () {
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if (args.length === 0) {
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lib.nextTick(callback.bind(null, errors));
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return;
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}
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var arg = args.shift();
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if (typeof arg === "function") {
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arg(function (err, res) {
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if (err) {
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errors.push(err);
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} else {
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while (res.length > 0) {
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args.unshift(res.pop());
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}
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}
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f();
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});
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return;
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}
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func(arg, function (err, res) {
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if (err) {
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errors.push(err);
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f();
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} else {
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lib.nextTick(callback.bind(null, null, res));
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}
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});
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};
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lib.nextTick(f);
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};
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module.exports = lib;
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