111 lines
2.7 KiB
JavaScript
111 lines
2.7 KiB
JavaScript
/**
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* Commonly-used functions for formatting text in badge labels. Includes
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* ordinal numbers, currency codes, star ratings, versions, etc.
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*/
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'use strict';
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const moment = require('moment');
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moment().format();
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function starRating(rating) {
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const flooredRating = Math.floor(rating);
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let stars = '';
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while (stars.length < flooredRating) { stars += '★'; }
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const decimal = rating - flooredRating;
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if (decimal >= 0.875) { stars += '★'; }
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else if (decimal >= 0.625) { stars += '¾'; }
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else if (decimal >= 0.375) { stars += '½'; }
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else if (decimal >= 0.125) { stars += '¼'; }
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while (stars.length < 5) { stars += '☆'; }
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return stars;
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}
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// Convert ISO 4217 code to unicode string.
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function currencyFromCode(code) {
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return ({
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CNY: '¥',
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EUR: '€',
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GBP: '₤',
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USD: '$',
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})[code] || code;
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}
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function ordinalNumber(n) {
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const s=['ᵗʰ','ˢᵗ','ⁿᵈ','ʳᵈ'], v=n%100;
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return n+(s[(v-20)%10]||s[v]||s[0]);
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}
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// Given a number, string with appropriate unit in the metric system, SI.
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// Note: numbers beyond the peta- cannot be represented as integers in JS.
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const metricPrefix = ['k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'];
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const metricPower = metricPrefix
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.map(function(a, i) { return Math.pow(1000, i + 1); });
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function metric(n) {
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for (let i = metricPrefix.length - 1; i >= 0; i--) {
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const limit = metricPower[i];
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if (n >= limit) {
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n = Math.round(n / limit);
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if (n < 1000) {
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return '' + n + metricPrefix[i];
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} else {
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return '1' + metricPrefix[i + 1];
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}
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}
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}
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return '' + n;
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}
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// Remove the starting v in a string.
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function omitv(version) {
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if (version.charCodeAt(0) === 118) {
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return version.slice(1);
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}
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return version;
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}
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// Add a starting v to the version unless:
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// - it does not start with a digit
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// - it is a date (yyyy-mm-dd)
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const ignoredVersionPatterns = /^[^0-9]|[0-9]{4}-[0-9]{2}-[0-9]{2}/;
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function addv(version) {
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version = '' + version;
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if (version.startsWith('v') || ignoredVersionPatterns.test(version)) {
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return version;
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} else {
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return `v${version}`;
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}
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}
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function maybePluralize(singular, countable, plural) {
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plural = plural || `${singular}s`;
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if (countable && countable.length === 1) {
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return singular;
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} else {
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return plural;
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}
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}
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function formatDate(d) {
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const date = moment(d);
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const dateString = date.calendar(null, {
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lastDay: '[yesterday]',
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sameDay: '[today]',
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lastWeek: '[last] dddd',
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sameElse: 'MMMM YYYY'
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});
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// Trim current year from date string
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return dateString.replace(` ${moment().year()}`, '').toLowerCase();
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}
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module.exports = {
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starRating,
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currencyFromCode,
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ordinalNumber,
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metric,
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omitv,
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addv,
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maybePluralize,
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formatDate
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};
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