forked from svrjs/svrjs
77 lines
1.7 KiB
JavaScript
77 lines
1.7 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 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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/*
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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) => {
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let result = number;
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if (typeof locale === 'string') {
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result = number.toLocaleString(locale);
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} else if (locale === true) {
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result = number.toLocaleString();
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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}, options);
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const UNITS = options.bits ? BIT_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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if (number < 1) {
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const numberString = toLocaleString(number, options.locale);
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return prefix + numberString + ' ' + UNITS[0];
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}
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const exponent = Math.min(Math.floor(Math.log10(number) / 3), UNITS.length - 1);
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// eslint-disable-next-line unicorn/prefer-exponentiation-operator
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number = Number((number / Math.pow(1000, exponent)).toPrecision(3));
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const numberString = toLocaleString(number, options.locale);
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const unit = UNITS[exponent];
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return prefix + numberString + ' ' + unit;
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};
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