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