160 lines
3.3 KiB
JavaScript
160 lines
3.3 KiB
JavaScript
/*!
|
|
* bytes
|
|
* Copyright(c) 2012-2014 TJ Holowaychuk
|
|
* Copyright(c) 2015 Jed Watson
|
|
* MIT Licensed
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
/**
|
|
* Module exports.
|
|
* @public
|
|
*/
|
|
|
|
module.exports = bytes;
|
|
module.exports.format = format;
|
|
module.exports.parse = parse;
|
|
|
|
/**
|
|
* Module variables.
|
|
* @private
|
|
*/
|
|
|
|
var formatThousandsRegExp = /\B(?=(\d{3})+(?!\d))/g;
|
|
|
|
var formatDecimalsRegExp = /(?:\.0*|(\.[^0]+)0+)$/;
|
|
|
|
var map = {
|
|
b: 1,
|
|
kb: 1 << 10,
|
|
mb: 1 << 20,
|
|
gb: 1 << 30,
|
|
tb: ((1 << 30) * 1024)
|
|
};
|
|
|
|
var parseRegExp = /^((-|\+)?(\d+(?:\.\d+)?)) *(kb|mb|gb|tb)$/i;
|
|
|
|
/**
|
|
* Convert the given value in bytes into a string or parse to string to an integer in bytes.
|
|
*
|
|
* @param {string|number} value
|
|
* @param {{
|
|
* case: [string],
|
|
* decimalPlaces: [number]
|
|
* fixedDecimals: [boolean]
|
|
* thousandsSeparator: [string]
|
|
* unitSeparator: [string]
|
|
* }} [options] bytes options.
|
|
*
|
|
* @returns {string|number|null}
|
|
*/
|
|
|
|
function bytes(value, options) {
|
|
if (typeof value === 'string') {
|
|
return parse(value);
|
|
}
|
|
|
|
if (typeof value === 'number') {
|
|
return format(value, options);
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Format the given value in bytes into a string.
|
|
*
|
|
* If the value is negative, it is kept as such. If it is a float,
|
|
* it is rounded.
|
|
*
|
|
* @param {number} value
|
|
* @param {object} [options]
|
|
* @param {number} [options.decimalPlaces=2]
|
|
* @param {number} [options.fixedDecimals=false]
|
|
* @param {string} [options.thousandsSeparator=]
|
|
* @param {string} [options.unit=]
|
|
* @param {string} [options.unitSeparator=]
|
|
*
|
|
* @returns {string|null}
|
|
* @public
|
|
*/
|
|
|
|
function format(value, options) {
|
|
if (!Number.isFinite(value)) {
|
|
return null;
|
|
}
|
|
|
|
var mag = Math.abs(value);
|
|
var thousandsSeparator = (options && options.thousandsSeparator) || '';
|
|
var unitSeparator = (options && options.unitSeparator) || '';
|
|
var decimalPlaces = (options && options.decimalPlaces !== undefined) ? options.decimalPlaces : 2;
|
|
var fixedDecimals = Boolean(options && options.fixedDecimals);
|
|
var unit = (options && options.unit) || '';
|
|
|
|
if (!unit || !map[unit.toLowerCase()]) {
|
|
if (mag >= map.tb) {
|
|
unit = 'TB';
|
|
} else if (mag >= map.gb) {
|
|
unit = 'GB';
|
|
} else if (mag >= map.mb) {
|
|
unit = 'MB';
|
|
} else if (mag >= map.kb) {
|
|
unit = 'KB';
|
|
} else {
|
|
unit = 'B';
|
|
}
|
|
}
|
|
|
|
var val = value / map[unit.toLowerCase()];
|
|
var str = val.toFixed(decimalPlaces);
|
|
|
|
if (!fixedDecimals) {
|
|
str = str.replace(formatDecimalsRegExp, '$1');
|
|
}
|
|
|
|
if (thousandsSeparator) {
|
|
str = str.replace(formatThousandsRegExp, thousandsSeparator);
|
|
}
|
|
|
|
return str + unitSeparator + unit;
|
|
}
|
|
|
|
/**
|
|
* Parse the string value into an integer in bytes.
|
|
*
|
|
* If no unit is given, it is assumed the value is in bytes.
|
|
*
|
|
* @param {number|string} val
|
|
*
|
|
* @returns {number|null}
|
|
* @public
|
|
*/
|
|
|
|
function parse(val) {
|
|
if (typeof val === 'number' && !isNaN(val)) {
|
|
return val;
|
|
}
|
|
|
|
if (typeof val !== 'string') {
|
|
return null;
|
|
}
|
|
|
|
// Test if the string passed is valid
|
|
var results = parseRegExp.exec(val);
|
|
var floatValue;
|
|
var unit = 'b';
|
|
|
|
if (!results) {
|
|
// Nothing could be extracted from the given string
|
|
floatValue = parseInt(val, 10);
|
|
unit = 'b'
|
|
} else {
|
|
// Retrieve the value and the unit
|
|
floatValue = parseFloat(results[1]);
|
|
unit = results[4].toLowerCase();
|
|
}
|
|
|
|
return Math.floor(map[unit] * floatValue);
|
|
}
|