119 lines
2.5 KiB
JavaScript
119 lines
2.5 KiB
JavaScript
'use strict';
|
|
|
|
const BYTE_UNITS = [
|
|
'B',
|
|
'kB',
|
|
'MB',
|
|
'GB',
|
|
'TB',
|
|
'PB',
|
|
'EB',
|
|
'ZB',
|
|
'YB'
|
|
];
|
|
|
|
const BIBYTE_UNITS = [
|
|
'B',
|
|
'kiB',
|
|
'MiB',
|
|
'GiB',
|
|
'TiB',
|
|
'PiB',
|
|
'EiB',
|
|
'ZiB',
|
|
'YiB'
|
|
];
|
|
|
|
const BIT_UNITS = [
|
|
'b',
|
|
'kbit',
|
|
'Mbit',
|
|
'Gbit',
|
|
'Tbit',
|
|
'Pbit',
|
|
'Ebit',
|
|
'Zbit',
|
|
'Ybit'
|
|
];
|
|
|
|
const BIBIT_UNITS = [
|
|
'b',
|
|
'kibit',
|
|
'Mibit',
|
|
'Gibit',
|
|
'Tibit',
|
|
'Pibit',
|
|
'Eibit',
|
|
'Zibit',
|
|
'Yibit'
|
|
];
|
|
|
|
/*
|
|
Formats the given number using `Number#toLocaleString`.
|
|
- If locale is a string, the value is expected to be a locale-key (for example: `de`).
|
|
- If locale is true, the system default locale is used for translation.
|
|
- If no value for locale is specified, the number is returned unmodified.
|
|
*/
|
|
const toLocaleString = (number, locale, options) => {
|
|
let result = number;
|
|
if (typeof locale === 'string' || Array.isArray(locale)) {
|
|
result = number.toLocaleString(locale, options);
|
|
} else if (locale === true || options !== undefined) {
|
|
result = number.toLocaleString(undefined, options);
|
|
}
|
|
|
|
return result;
|
|
};
|
|
|
|
module.exports = (number, options) => {
|
|
if (!Number.isFinite(number)) {
|
|
throw new TypeError(`Expected a finite number, got ${typeof number}: ${number}`);
|
|
}
|
|
|
|
options = Object.assign({bits: false, binary: false}, options);
|
|
|
|
const UNITS = options.bits ?
|
|
(options.binary ? BIBIT_UNITS : BIT_UNITS) :
|
|
(options.binary ? BIBYTE_UNITS : BYTE_UNITS);
|
|
|
|
if (options.signed && number === 0) {
|
|
return ` 0 ${UNITS[0]}`;
|
|
}
|
|
|
|
const isNegative = number < 0;
|
|
const prefix = isNegative ? '-' : (options.signed ? '+' : '');
|
|
|
|
if (isNegative) {
|
|
number = -number;
|
|
}
|
|
|
|
let localeOptions;
|
|
|
|
if (options.minimumFractionDigits !== undefined) {
|
|
localeOptions = {minimumFractionDigits: options.minimumFractionDigits};
|
|
}
|
|
|
|
if (options.maximumFractionDigits !== undefined) {
|
|
localeOptions = Object.assign({maximumFractionDigits: options.maximumFractionDigits}, localeOptions);
|
|
}
|
|
|
|
if (number < 1) {
|
|
const numberString = toLocaleString(number, options.locale, localeOptions);
|
|
return prefix + numberString + ' ' + UNITS[0];
|
|
}
|
|
|
|
const exponent = Math.min(Math.floor(options.binary ? Math.log(number) / Math.log(1024) : Math.log10(number) / 3), UNITS.length - 1);
|
|
// eslint-disable-next-line unicorn/prefer-exponentiation-operator
|
|
number /= Math.pow(options.binary ? 1024 : 1000, exponent);
|
|
|
|
if (!localeOptions) {
|
|
number = number.toPrecision(3);
|
|
}
|
|
|
|
const numberString = toLocaleString(Number(number), options.locale, localeOptions);
|
|
|
|
const unit = UNITS[exponent];
|
|
|
|
return prefix + numberString + ' ' + unit;
|
|
};
|