root / HServer / 00.Server / 00.Program / node_modules / bytes / index.js
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| 1 | 39 | HKM | /*!
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| 2 | * bytes
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| 3 | * Copyright(c) 2012-2014 TJ Holowaychuk
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| 4 | * Copyright(c) 2015 Jed Watson
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| 5 | * MIT Licensed
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| 6 | */
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| 7 | |||
| 8 | 'use strict';
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| 9 | |||
| 10 | /**
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| 11 | * Module exports.
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| 12 | * @public
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| 13 | */
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| 14 | |||
| 15 | module.exports = bytes; |
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| 16 | module.exports.format = format; |
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| 17 | module.exports.parse = parse; |
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| 18 | |||
| 19 | /**
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| 20 | * Module variables.
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| 21 | * @private
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| 22 | */
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| 23 | |||
| 24 | var formatThousandsRegExp = /\B(?=(\d{3})+(?!\d))/g; |
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| 25 | |||
| 26 | var formatDecimalsRegExp = /(?:\.0*|(\.[^0]+)0+)$/; |
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| 27 | |||
| 28 | var map = {
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| 29 | b: 1, |
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| 30 | kb: 1 << 10, |
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| 31 | mb: 1 << 20, |
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| 32 | gb: 1 << 30, |
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| 33 | tb: ((1 << 30) * 1024) |
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| 34 | }; |
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| 35 | |||
| 36 | var parseRegExp = /^((-|\+)?(\d+(?:\.\d+)?)) *(kb|mb|gb|tb)$/i; |
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| 37 | |||
| 38 | /**
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| 39 | * Convert the given value in bytes into a string or parse to string to an integer in bytes.
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| 40 | *
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| 41 | * @param {string|number} value
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| 42 | * @param {{
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| 43 | * case: [string],
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| 44 | * decimalPlaces: [number]
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| 45 | * fixedDecimals: [boolean]
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| 46 | * thousandsSeparator: [string]
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| 47 | * unitSeparator: [string]
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| 48 | * }} [options] bytes options.
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| 49 | *
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| 50 | * @returns {string|number|null}
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| 51 | */
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| 52 | |||
| 53 | function bytes(value, options) { |
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| 54 | if (typeof value === 'string') { |
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| 55 | return parse(value);
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| 56 | } |
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| 57 | |||
| 58 | if (typeof value === 'number') { |
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| 59 | return format(value, options);
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| 60 | } |
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| 61 | |||
| 62 | return null; |
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| 63 | } |
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| 64 | |||
| 65 | /**
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| 66 | * Format the given value in bytes into a string.
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| 67 | *
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| 68 | * If the value is negative, it is kept as such. If it is a float,
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| 69 | * it is rounded.
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| 70 | *
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| 71 | * @param {number} value
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| 72 | * @param {object} [options]
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| 73 | * @param {number} [options.decimalPlaces=2]
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| 74 | * @param {number} [options.fixedDecimals=false]
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| 75 | * @param {string} [options.thousandsSeparator=]
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| 76 | * @param {string} [options.unit=]
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| 77 | * @param {string} [options.unitSeparator=]
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| 78 | *
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| 79 | * @returns {string|null}
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| 80 | * @public
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| 81 | */
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| 82 | |||
| 83 | function format(value, options) { |
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| 84 | if (!Number.isFinite(value)) {
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| 85 | return null; |
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| 86 | } |
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| 87 | |||
| 88 | var mag = Math.abs(value);
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| 89 | var thousandsSeparator = (options && options.thousandsSeparator) || ''; |
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| 90 | var unitSeparator = (options && options.unitSeparator) || ''; |
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| 91 | var decimalPlaces = (options && options.decimalPlaces !== undefined) ? options.decimalPlaces : 2; |
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| 92 | var fixedDecimals = Boolean(options && options.fixedDecimals);
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| 93 | var unit = (options && options.unit) || ''; |
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| 94 | |||
| 95 | if (!unit || !map[unit.toLowerCase()]) {
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| 96 | if (mag >= map.tb) {
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| 97 | unit = 'TB';
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| 98 | } else if (mag >= map.gb) { |
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| 99 | unit = 'GB';
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| 100 | } else if (mag >= map.mb) { |
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| 101 | unit = 'MB';
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| 102 | } else if (mag >= map.kb) { |
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| 103 | unit = 'KB';
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| 104 | } else {
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| 105 | unit = 'B';
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| 106 | } |
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| 107 | } |
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| 108 | |||
| 109 | var val = value / map[unit.toLowerCase()];
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| 110 | var str = val.toFixed(decimalPlaces);
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| 111 | |||
| 112 | if (!fixedDecimals) {
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| 113 | str = str.replace(formatDecimalsRegExp, '$1');
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| 114 | } |
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| 115 | |||
| 116 | if (thousandsSeparator) {
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| 117 | str = str.replace(formatThousandsRegExp, thousandsSeparator); |
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| 118 | } |
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| 119 | |||
| 120 | return str + unitSeparator + unit;
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| 121 | } |
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| 122 | |||
| 123 | /**
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| 124 | * Parse the string value into an integer in bytes.
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| 125 | *
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| 126 | * If no unit is given, it is assumed the value is in bytes.
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| 127 | *
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| 128 | * @param {number|string} val
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| 129 | *
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| 130 | * @returns {number|null}
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| 131 | * @public
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| 132 | */
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| 133 | |||
| 134 | function parse(val) { |
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| 135 | if (typeof val === 'number' && !isNaN(val)) { |
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| 136 | return val;
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| 137 | } |
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| 138 | |||
| 139 | if (typeof val !== 'string') { |
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| 140 | return null; |
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| 141 | } |
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| 142 | |||
| 143 | // Test if the string passed is valid
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| 144 | var results = parseRegExp.exec(val);
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| 145 | var floatValue;
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| 146 | var unit = 'b'; |
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| 147 | |||
| 148 | if (!results) {
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| 149 | // Nothing could be extracted from the given string
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| 150 | floatValue = parseInt(val, 10);
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| 151 | unit = 'b'
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| 152 | } else {
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| 153 | // Retrieve the value and the unit
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| 154 | floatValue = parseFloat(results[1]);
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| 155 | unit = results[4].toLowerCase();
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| 156 | } |
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| 157 | |||
| 158 | return Math.floor(map[unit] * floatValue);
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| 159 | } |