tell-me-when/util/getGrammar.mjs

human relative date and time parser

import { GrammarNode } from "./GrammarNode.mjs";
import { locales } from "../locales.mjs";
const grammarCache = new Map();
export function getGrammar({
  locales: localeNames = getDefaultLocaleNames()
} = {}) {
  const key = JSON.stringify(localeNames);
  let grammar = grammarCache.get(key);
  if (grammar) return grammar;
  grammarCache.set(key, grammar = getGrammarHelper({
    localeNames
  }));
  return grammar;
}
function getGrammarHelper({
  localeNames
}) {
  if (localeNames.length === 1) {
    return locales[localeNames[0]];
  }
  return GrammarNode.longestOf(...localeNames.map(name => locales[name]));
}
let defaultLocaleNames;
function getDefaultLocaleNames() {
  if (defaultLocaleNames) return defaultLocaleNames;
  const {
    locale: primaryLocale
  } = new Intl.DateTimeFormat().resolvedOptions();
  const localeKeys = Object.keys(locales);
  const primary = localeKeys.find(k => primaryLocale.startsWith(k));
  return defaultLocaleNames = [...(primary ? [primary] : []), ...localeKeys.filter(k => k !== primary)];
}
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