98 lines
2.0 KiB
JavaScript
98 lines
2.0 KiB
JavaScript
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/*!
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* Cluster - utils
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* Copyright (c) 2011 LearnBoost <dev@learnboost.com>
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* MIT Licensed
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*/
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/**
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* Frame the given `obj`.
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*
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* @param {Object} obj
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* @return {String}
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* @api private
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*/
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exports.frame = function(obj){
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return JSON.stringify(obj) + '\n';
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};
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/**
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* Fast alternative to `Array.prototype.slice.call()`.
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*
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* @param {Arguments} args
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* @param {Number} index
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* @return {Array}
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* @api private
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*/
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exports.toArray = function(args, index){
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var arr = []
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, len = args.length;
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for (var i = (index || 0); i < len; ++i) {
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arr.push(args[i]);
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}
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return arr;
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};
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/**
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* Format byte-size.
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*
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* @param {Number} bytes
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* @return {String}
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* @api private
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*/
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exports.formatBytes = function(bytes) {
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var kb = 1024
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, mb = 1024 * kb
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, gb = 1024 * mb;
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if (bytes < kb) return bytes + 'b';
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if (bytes < mb) return (bytes / kb).toFixed(2) + 'kb';
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if (bytes < gb) return (bytes / mb).toFixed(2) + 'mb';
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return (bytes / gb).toFixed(2) + 'gb';
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};
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/**
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* Format date difference between `a` and `b`.
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*
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* @param {Date} a
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* @param {Date} b
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* @return {String}
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* @api private
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*/
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exports.formatDateRange = function(a, b) {
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var diff = a > b ? a - b : b - a
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, second = 1000
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, minute = second * 60
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, hour = minute * 60
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, day = hour * 24;
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function unit(name, n) {
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return n + ' ' + name + (1 == n ? '' : 's');
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}
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if (diff < second) return unit('millisecond', diff);
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if (diff < minute) return unit('second', (diff / second).toFixed(0));
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if (diff < hour) return unit('minute', (diff / minute).toFixed(0));
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if (diff < day) return unit('hour', (diff / hour).toFixed(0));
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return unit('day', (diff / day).toFixed(1));
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};
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/**
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* Unshift a callback.
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*
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* @param {Object} obj
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* @param {String} event
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* @param {String} fn
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* @api private
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*/
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exports.unshiftListener = function(obj, event, fn){
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if (Array.isArray(obj._events[event])) {
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obj._events[event].unshift(fn);
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} else {
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obj._events[event] = [fn, obj._events[event]];
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}
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}; |