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Diffstat (limited to 'deps/npm/node_modules/byte-size/dist/index.js')
| -rw-r--r-- | deps/npm/node_modules/byte-size/dist/index.js | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/deps/npm/node_modules/byte-size/dist/index.js b/deps/npm/node_modules/byte-size/dist/index.js new file mode 100644 index 0000000000..8253a63545 --- /dev/null +++ b/deps/npm/node_modules/byte-size/dist/index.js @@ -0,0 +1,152 @@ +(function (global, factory) { + typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() : + typeof define === 'function' && define.amd ? define(factory) : + (global = global || self, global.byteSize = factory()); +}(this, function () { 'use strict'; + + /** + * An isomorphic, load-anywhere function to convert a bytes value into a more human-readable format. Choose between [metric or IEC units](https://en.wikipedia.org/wiki/Gigabyte), summarised below. + * + * Value | Metric + * ----- | ------------- + * 1000 | kB kilobyte + * 1000^2 | MB megabyte + * 1000^3 | GB gigabyte + * 1000^4 | TB terabyte + * 1000^5 | PB petabyte + * 1000^6 | EB exabyte + * 1000^7 | ZB zettabyte + * 1000^8 | YB yottabyte + * + * Value | IEC + * ----- | ------------ + * 1024 | KiB kibibyte + * 1024^2 | MiB mebibyte + * 1024^3 | GiB gibibyte + * 1024^4 | TiB tebibyte + * 1024^5 | PiB pebibyte + * 1024^6 | EiB exbibyte + * 1024^7 | ZiB zebibyte + * 1024^8 | YiB yobibyte + * + * Value | Metric (octet) + * ----- | ------------- + * 1000 | ko kilooctet + * 1000^2 | Mo megaoctet + * 1000^3 | Go gigaoctet + * 1000^4 | To teraoctet + * 1000^5 | Po petaoctet + * 1000^6 | Eo exaoctet + * 1000^7 | Zo zettaoctet + * 1000^8 | Yo yottaoctet + * + * Value | IEC (octet) + * ----- | ------------ + * 1024 | Kio kilooctet + * 1024^2 | Mio mebioctet + * 1024^3 | Gio gibioctet + * 1024^4 | Tio tebioctet + * 1024^5 | Pio pebioctet + * 1024^6 | Eio exbioctet + * 1024^7 | Zio zebioctet + * 1024^8 | Yio yobioctet + * + * @module byte-size + * @example + * ```js + * const byteSize = require('byte-size') + * ``` + */ + + class ByteSize { + constructor (bytes, options) { + options = options || {}; + options.units = options.units || 'metric'; + options.precision = typeof options.precision === 'undefined' ? 1 : options.precision; + + const table = [ + { expFrom: 0, expTo: 1, metric: 'B', iec: 'B', metric_octet: 'o', iec_octet: 'o' }, + { expFrom: 1, expTo: 2, metric: 'kB', iec: 'KiB', metric_octet: 'ko', iec_octet: 'Kio' }, + { expFrom: 2, expTo: 3, metric: 'MB', iec: 'MiB', metric_octet: 'Mo', iec_octet: 'Mio' }, + { expFrom: 3, expTo: 4, metric: 'GB', iec: 'GiB', metric_octet: 'Go', iec_octet: 'Gio' }, + { expFrom: 4, expTo: 5, metric: 'TB', iec: 'TiB', metric_octet: 'To', iec_octet: 'Tio' }, + { expFrom: 5, expTo: 6, metric: 'PB', iec: 'PiB', metric_octet: 'Po', iec_octet: 'Pio' }, + { expFrom: 6, expTo: 7, metric: 'EB', iec: 'EiB', metric_octet: 'Eo', iec_octet: 'Eio' }, + { expFrom: 7, expTo: 8, metric: 'ZB', iec: 'ZiB', metric_octet: 'Zo', iec_octet: 'Zio' }, + { expFrom: 8, expTo: 9, metric: 'YB', iec: 'YiB', metric_octet: 'Yo', iec_octet: 'Yio' } + ]; + + const base = options.units === 'metric' || options.units === 'metric_octet' ? 1000 : 1024; + const prefix = bytes < 0 ? '-' : ''; + bytes = Math.abs(bytes); + + for (let i = 0; i < table.length; i++) { + const lower = Math.pow(base, table[i].expFrom); + const upper = Math.pow(base, table[i].expTo); + if (bytes >= lower && bytes < upper) { + const units = table[i][options.units]; + if (i === 0) { + this.value = prefix + bytes; + this.unit = units; + return + } else { + this.value = prefix + (bytes / lower).toFixed(options.precision); + this.unit = units; + return + } + } + } + + this.value = prefix + bytes; + this.unit = ''; + } + + toString () { + return `${this.value} ${this.unit}`.trim() + } + } + + /** + * @param {number} - the bytes value to convert. + * @param [options] {object} - optional config. + * @param [options.precision=1] {number} - number of decimal places. + * @param [options.units=metric] {string} - select `'metric'`, `'iec'`, `'metric_octet'` or `'iec_octet'` units. + * @returns {{ value: string, unit: string}} + * @alias module:byte-size + * @example + * ```js + * > const byteSize = require('byte-size') + * + * > byteSize(1580) + * { value: '1.6', unit: 'kB' } + * + * > byteSize(1580, { units: 'iec' }) + * { value: '1.5', unit: 'KiB' } + * + * > byteSize(1580, { units: 'iec', precision: 3 }) + * { value: '1.543', unit: 'KiB' } + * + * > byteSize(1580, { units: 'iec', precision: 0 }) + * { value: '2', unit: 'KiB' } + * + * > byteSize(1580, { units: 'metric_octet' }) + * { value: '1.6', unit: 'ko' } + * + * > byteSize(1580, { units: 'iec_octet' }) + * { value: '1.5', unit: 'Kio' } + * + * > byteSize(1580, { units: 'iec_octet' }).toString() + * '1.5 Kio' + * + * > const { value, unit } = byteSize(1580, { units: 'iec_octet' }) + * > `${value} ${unit}` + * '1.5 Kio' + * ``` + */ + function byteSize (bytes, options) { + return new ByteSize(bytes, options) + } + + return byteSize; + +})); |