angular__angular/packages/common/locales/generate-locales-tool/day-periods.ts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {CldrLocaleData} from './cldr-data';

/**
 * Returns data for the chosen day periods
 */
export function getDayPeriods(
  localeData: CldrLocaleData,
  dayPeriodsList: string[],
): {
  format: {
    narrow: Record<string, string>;
    abbreviated: Record<string, string>;
    wide: Record<string, string>;
  };
  'stand-alone': {
    narrow: Record<string, string>;
    abbreviated: Record<string, string>;
    wide: Record<string, string>;
  };
} {
  const dayPeriods = localeData.main(`dates/calendars/gregorian/dayPeriods`);
  const result: any = {};
  // cleaning up unused keys
  Object.keys(dayPeriods).forEach((key1) => {
    // format / stand-alone
    result[key1] = {};
    Object.keys(dayPeriods[key1]).forEach((key2) => {
      // narrow / abbreviated / wide
      result[key1][key2] = {};
      Object.keys(dayPeriods[key1][key2]).forEach((key3) => {
        if (dayPeriodsList.indexOf(key3) !== -1) {
          result[key1][key2][key3] = dayPeriods[key1][key2][key3];
        }
      });
    });
  });

  return result as any;
}

/**
 * Returns day period rules for a locale
 * @returns string[]
 */
export function getDayPeriodRules(
  localeData: CldrLocaleData,
  language = localeData.attributes.language,
): Record<string, string | [string, string]> {
  const dayPeriodRules = localeData.get(`supplemental/dayPeriodRuleSet/${language}`);
  const rules: any = {};
  if (dayPeriodRules) {
    Object.keys(dayPeriodRules).forEach((key) => {
      if (dayPeriodRules[key]._at) {
        rules[key] = dayPeriodRules[key]._at;
      } else {
        rules[key] = [dayPeriodRules[key]._from, dayPeriodRules[key]._before];
      }
    });
  }

  // Implements inheritance for the day periods. As of CLDR v39, the `nn` locale
  // for example fully inherits from `no`.
  // http://cldr.unicode.org/index/downloads/cldr-39?pli=1#TOC-Migration.
  if (dayPeriodRules === undefined) {
    const parentLocale = localeData.get(`supplemental/parentLocales/parentLocale/${language}`);

    if (parentLocale !== undefined) {
      return getDayPeriodRules(localeData, parentLocale);
    }
  }

  return rules;
}

/**
 * Returns the basic day periods (am/pm)
 */
export function getDayPeriodsAmPm(localeData: CldrLocaleData) {
  return getDayPeriods(localeData, ['am', 'pm']);
}

/**
 * Returns the extra day periods (without am/pm)
 */
export function getDayPeriodsNoAmPm(localeData: CldrLocaleData) {
  return getDayPeriods(localeData, [
    'noon',
    'midnight',
    'morning1',
    'morning2',
    'afternoon1',
    'afternoon2',
    'evening1',
    'evening2',
    'night1',
    'night2',
  ]);
}