source: trip-planner-front/node_modules/pretty-bytes/index.js@ fa375fe

Last change on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.5 KB
Line 
1'use strict';
2
3const BYTE_UNITS = [
4 'B',
5 'kB',
6 'MB',
7 'GB',
8 'TB',
9 'PB',
10 'EB',
11 'ZB',
12 'YB'
13];
14
15const BIBYTE_UNITS = [
16 'B',
17 'kiB',
18 'MiB',
19 'GiB',
20 'TiB',
21 'PiB',
22 'EiB',
23 'ZiB',
24 'YiB'
25];
26
27const BIT_UNITS = [
28 'b',
29 'kbit',
30 'Mbit',
31 'Gbit',
32 'Tbit',
33 'Pbit',
34 'Ebit',
35 'Zbit',
36 'Ybit'
37];
38
39const BIBIT_UNITS = [
40 'b',
41 'kibit',
42 'Mibit',
43 'Gibit',
44 'Tibit',
45 'Pibit',
46 'Eibit',
47 'Zibit',
48 'Yibit'
49];
50
51/*
52Formats the given number using `Number#toLocaleString`.
53- If locale is a string, the value is expected to be a locale-key (for example: `de`).
54- If locale is true, the system default locale is used for translation.
55- If no value for locale is specified, the number is returned unmodified.
56*/
57const toLocaleString = (number, locale, options) => {
58 let result = number;
59 if (typeof locale === 'string' || Array.isArray(locale)) {
60 result = number.toLocaleString(locale, options);
61 } else if (locale === true || options !== undefined) {
62 result = number.toLocaleString(undefined, options);
63 }
64
65 return result;
66};
67
68module.exports = (number, options) => {
69 if (!Number.isFinite(number)) {
70 throw new TypeError(`Expected a finite number, got ${typeof number}: ${number}`);
71 }
72
73 options = Object.assign({bits: false, binary: false}, options);
74
75 const UNITS = options.bits ?
76 (options.binary ? BIBIT_UNITS : BIT_UNITS) :
77 (options.binary ? BIBYTE_UNITS : BYTE_UNITS);
78
79 if (options.signed && number === 0) {
80 return ` 0 ${UNITS[0]}`;
81 }
82
83 const isNegative = number < 0;
84 const prefix = isNegative ? '-' : (options.signed ? '+' : '');
85
86 if (isNegative) {
87 number = -number;
88 }
89
90 let localeOptions;
91
92 if (options.minimumFractionDigits !== undefined) {
93 localeOptions = {minimumFractionDigits: options.minimumFractionDigits};
94 }
95
96 if (options.maximumFractionDigits !== undefined) {
97 localeOptions = Object.assign({maximumFractionDigits: options.maximumFractionDigits}, localeOptions);
98 }
99
100 if (number < 1) {
101 const numberString = toLocaleString(number, options.locale, localeOptions);
102 return prefix + numberString + ' ' + UNITS[0];
103 }
104
105 const exponent = Math.min(Math.floor(options.binary ? Math.log(number) / Math.log(1024) : Math.log10(number) / 3), UNITS.length - 1);
106 // eslint-disable-next-line unicorn/prefer-exponentiation-operator
107 number /= Math.pow(options.binary ? 1024 : 1000, exponent);
108
109 if (!localeOptions) {
110 number = number.toPrecision(3);
111 }
112
113 const numberString = toLocaleString(Number(number), options.locale, localeOptions);
114
115 const unit = UNITS[exponent];
116
117 return prefix + numberString + ' ' + unit;
118};
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