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All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\n// Portions of the code in this file are based on code from ICU.\n// Original licensing can be found in the NOTICE file in the root directory of this source tree.\n\nimport {AnyCalendarDate, Calendar, CalendarIdentifier} from '../types';\nimport {CalendarDate} from '../CalendarDate';\nimport {Mutable} from '../utils';\n\nconst ETHIOPIC_EPOCH = 1723856;\nconst COPTIC_EPOCH = 1824665;\n\n// The delta between Amete Alem 1 and Amete Mihret 1\n// AA 5501 = AM 1\nconst AMETE_MIHRET_DELTA = 5500;\n\nfunction ceToJulianDay(epoch: number, year: number, month: number, day: number): number {\n  return (\n    epoch                   // difference from Julian epoch to 1,1,1\n    + 365 * year            // number of days from years\n    + Math.floor(year / 4)  // extra day of leap year\n    + 30 * (month - 1)      // number of days from months (1 based)\n    + day - 1               // number of days for present month (1 based)\n  );\n}\n\nfunction julianDayToCE(epoch: number, jd: number) {\n  let year = Math.floor((4 * (jd - epoch)) / 1461);\n  let month = 1 + Math.floor((jd - ceToJulianDay(epoch, year, 1, 1)) / 30);\n  let day = jd + 1 - ceToJulianDay(epoch, year, month, 1);\n  return [year, month, day];\n}\n\nfunction getLeapDay(year: number) {\n  return Math.floor((year % 4) / 3);\n}\n\nfunction getDaysInMonth(year: number, month: number) {\n  // The Ethiopian and Coptic calendars have 13 months, 12 of 30 days each and\n  // an intercalary month at the end of the year of 5 or 6 days, depending whether\n  // the year is a leap year or not. The Leap Year follows the same rules as the\n  // Julian Calendar so that the extra month always has six days in the year before\n  // a Julian Leap Year.\n  if (month % 13 !== 0) {\n    // not intercalary month\n    return 30;\n  } else {\n    // intercalary month 5 days + possible leap day\n    return getLeapDay(year) + 5;\n  }\n}\n\n/**\n * The Ethiopic calendar system is the official calendar used in Ethiopia.\n * It includes 12 months of 30 days each, plus 5 or 6 intercalary days depending\n * on whether it is a leap year. Two eras are supported: 'AA' and 'AM'.\n */\nexport class EthiopicCalendar implements Calendar {\n  identifier: CalendarIdentifier = 'ethiopic';\n\n  fromJulianDay(jd: number): CalendarDate {\n    let [year, month, day] = julianDayToCE(ETHIOPIC_EPOCH, jd);\n    let era = 'AM';\n    if (year <= 0) {\n      era = 'AA';\n      year += AMETE_MIHRET_DELTA;\n    }\n\n    return new CalendarDate(this, era, year, month, day);\n  }\n\n  toJulianDay(date: AnyCalendarDate): number {\n    let year = date.year;\n    if (date.era === 'AA') {\n      year -= AMETE_MIHRET_DELTA;\n    }\n\n    return ceToJulianDay(ETHIOPIC_EPOCH, year, date.month, date.day);\n  }\n\n  getDaysInMonth(date: AnyCalendarDate): number {\n    return getDaysInMonth(date.year, date.month);\n  }\n\n  getMonthsInYear(): number {\n    return 13;\n  }\n\n  getDaysInYear(date: AnyCalendarDate): number {\n    return 365 + getLeapDay(date.year);\n  }\n\n  getYearsInEra(date: AnyCalendarDate): number {\n    // 9999-12-31 gregorian is 9992-20-02 ethiopic.\n    // Round down to 9991 for the last full year.\n    // AA 9999-01-01 ethiopic is 4506-09-30 gregorian.\n    return date.era === 'AA' ? 9999 : 9991;\n  }\n\n  getEras(): string[] {\n    return ['AA', 'AM'];\n  }\n}\n\n/**\n * The Ethiopic (Amete Alem) calendar is the same as the modern Ethiopic calendar,\n * except years were measured from a different epoch. Only one era is supported: 'AA'.\n */\nexport class EthiopicAmeteAlemCalendar extends EthiopicCalendar {\n  identifier: CalendarIdentifier = 'ethioaa'; // also known as 'ethiopic-amete-alem' in ICU\n\n  fromJulianDay(jd: number): CalendarDate {\n    let [year, month, day] = julianDayToCE(ETHIOPIC_EPOCH, jd);\n    year += AMETE_MIHRET_DELTA;\n    return new CalendarDate(this, 'AA', year, month, day);\n  }\n\n  getEras(): string[] {\n    return ['AA'];\n  }\n\n  getYearsInEra(): number {\n    // 9999-13-04 ethioaa is the maximum date, which is equivalent to 4506-09-29 gregorian.\n    return 9999;\n  }\n}\n\n/**\n * The Coptic calendar is similar to the Ethiopic calendar.\n * It includes 12 months of 30 days each, plus 5 or 6 intercalary days depending\n * on whether it is a leap year. Two eras are supported: 'BCE' and 'CE'.\n */\nexport class CopticCalendar extends EthiopicCalendar {\n  identifier: CalendarIdentifier = 'coptic';\n\n  fromJulianDay(jd: number): CalendarDate {\n    let [year, month, day] = julianDayToCE(COPTIC_EPOCH, jd);\n    let era = 'CE';\n    if (year <= 0) {\n      era = 'BCE';\n      year = 1 - year;\n    }\n\n    return new CalendarDate(this, era, year, month, day);\n  }\n\n  toJulianDay(date: AnyCalendarDate): number {\n    let year = date.year;\n    if (date.era === 'BCE') {\n      year = 1 - year;\n    }\n\n    return ceToJulianDay(COPTIC_EPOCH, year, date.month, date.day);\n  }\n\n  getDaysInMonth(date: AnyCalendarDate): number {\n    let year = date.year;\n    if (date.era === 'BCE') {\n      year = 1 - year;\n    }\n\n    return getDaysInMonth(year, date.month);\n  }\n\n  isInverseEra(date: AnyCalendarDate): boolean {\n    return date.era === 'BCE';\n  }\n\n  balanceDate(date: Mutable<AnyCalendarDate>): void {\n    if (date.year <= 0) {\n      date.era = date.era === 'BCE' ? 'CE' : 'BCE';\n      date.year = 1 - date.year;\n    }\n  }\n\n  getEras(): string[] {\n    return ['BCE', 'CE'];\n  }\n\n  getYearsInEra(date: AnyCalendarDate): number {\n    // 9999-12-30 gregorian is 9716-02-20 coptic.\n    // Round down to 9715 for the last full year.\n    // BCE 9999-01-01 coptic is BC 9716-06-15 gregorian.\n    return date.era === 'BCE' ? 9999 : 9715;\n  }\n}\n"],"names":[],"version":3,"file":"EthiopicCalendar.module.js.map"}