bytes.js

// numeral.js format configuration
// format : bytes
// author : Adam Draper : https://github.com/adamwdraper

(function (global, factory) {
    if (typeof define === 'function' && define.amd) {
        define(['../numeral'], factory);
    } else if (typeof module === 'object' && module.exports) {
        factory(require('../numeral'));
    } else {
        factory(global.numeral);
    }
}(this, function (numeral) {
    var decimal = {
            base: 1000,
            suffixes: ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
        },
        binary = {
            base: 1024,
            suffixes: ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB']
        };

    var allSuffixes =  decimal.suffixes.concat(binary.suffixes.filter(function (item) {
            return decimal.suffixes.indexOf(item) < 0;
        }));
        var unformatRegex = allSuffixes.join('|');
        // Allow support for BPS (http://www.investopedia.com/terms/b/basispoint.asp)
        unformatRegex = '(' + unformatRegex.replace('B', 'B(?!PS)') + ')';

    numeral.register('format', 'bytes', {
        regexps: {
            format: /([0\s]i?b)/,
            unformat: new RegExp(unformatRegex)
        },
        format: function(value, format, roundingFunction) {
            var output,
                bytes = numeral._.includes(format, 'ib') ? binary : decimal,
                suffix = numeral._.includes(format, ' b') || numeral._.includes(format, ' ib') ? ' ' : '',
                power,
                min,
                max;

            // check for space before
            format = format.replace(/\s?i?b/, '');

            for (power = 0; power <= bytes.suffixes.length; power++) {
                min = Math.pow(bytes.base, power);
                max = Math.pow(bytes.base, power + 1);

                if (value === null || value === 0 || value >= min && value < max) {
                    suffix += bytes.suffixes[power];

                    if (min > 0) {
                        value = value / min;
                    }

                    break;
                }
            }

            output = numeral._.numberToFormat(value, format, roundingFunction);

            return output + suffix;
        },
        unformat: function(string) {
            var value = numeral._.stringToNumber(string),
                power,
                bytesMultiplier;

            if (value) {
                for (power = decimal.suffixes.length - 1; power >= 0; power--) {
                    if (numeral._.includes(string, decimal.suffixes[power])) {
                        bytesMultiplier = Math.pow(decimal.base, power);

                        break;
                    }

                    if (numeral._.includes(string, binary.suffixes[power])) {
                        bytesMultiplier = Math.pow(binary.base, power);

                        break;
                    }
                }

                value *= (bytesMultiplier || 1);
            }

            return value;
        }
    });
}));