Edit D:\xinhaisoft\crisis_new\api\node_modules\bytes\index.js
/*! * 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+)$/; var map = { b: 1, kb: 1 << 10, mb: 1 << 20, gb: 1 << 30, tb: Math.pow(1024, 4), pb: Math.pow(1024, 5), }; var parseRegExp = /^((-|\+)?(\d+(?:\.\d+)?)) *(kb|mb|gb|tb|pb)$/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.pb) { unit = 'PB'; } else 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); }
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