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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 {mod, Mutable} from '../utils';\n\nconst EPOCH = 1721426; // 001/01/03 Julian C.E.\nexport function gregorianToJulianDay(era: string, year: number, month: number, day: number): number {\n  year = getExtendedYear(era, year);\n\n  let y1 = year - 1;\n  let monthOffset = -2;\n  if (month <= 2) {\n    monthOffset = 0;\n  } else if (isLeapYear(year)) {\n    monthOffset = -1;\n  }\n\n  return (\n    EPOCH -\n    1 +\n    365 * y1 +\n    Math.floor(y1 / 4) -\n    Math.floor(y1 / 100) +\n    Math.floor(y1 / 400) +\n    Math.floor((367 * month - 362) / 12 + monthOffset + day)\n  );\n}\n\nexport function isLeapYear(year: number): boolean {\n  return year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0);\n}\n\nexport function getExtendedYear(era: string, year: number): number {\n  return era === 'BC' ? 1 - year : year;\n}\n\nexport function fromExtendedYear(year: number): [string, number] {\n  let era = 'AD';\n  if (year <= 0) {\n    era = 'BC';\n    year = 1 - year;\n  }\n\n  return [era, year];\n}\n\nconst daysInMonth = {\n  standard: [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],\n  leapyear: [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]\n};\n\n/**\n * The Gregorian calendar is the most commonly used calendar system in the world. It supports two eras: BC, and AD.\n * Years always contain 12 months, and 365 or 366 days depending on whether it is a leap year.\n */\nexport class GregorianCalendar implements Calendar {\n  identifier: CalendarIdentifier = 'gregory';\n\n  fromJulianDay(jd: number): CalendarDate {\n    let jd0 = jd;\n    let depoch = jd0 - EPOCH;\n    let quadricent = Math.floor(depoch / 146097);\n    let dqc = mod(depoch, 146097);\n    let cent = Math.floor(dqc / 36524);\n    let dcent = mod(dqc, 36524);\n    let quad = Math.floor(dcent / 1461);\n    let dquad = mod(dcent, 1461);\n    let yindex = Math.floor(dquad / 365);\n\n    let extendedYear = quadricent * 400 + cent * 100 + quad * 4 + yindex + (cent !== 4 && yindex !== 4 ? 1 : 0);\n    let [era, year] = fromExtendedYear(extendedYear);\n    let yearDay = jd0 - gregorianToJulianDay(era, year, 1, 1);\n    let leapAdj = 2;\n    if (jd0 < gregorianToJulianDay(era, year, 3, 1)) {\n      leapAdj = 0;\n    } else if (isLeapYear(year)) {\n      leapAdj = 1;\n    }\n    let month = Math.floor(((yearDay + leapAdj) * 12 + 373) / 367);\n    let day = jd0 - gregorianToJulianDay(era, year, month, 1) + 1;\n\n    return new CalendarDate(era, year, month, day);\n  }\n\n  toJulianDay(date: AnyCalendarDate): number {\n    return gregorianToJulianDay(date.era, date.year, date.month, date.day);\n  }\n\n  getDaysInMonth(date: AnyCalendarDate): number {\n    return daysInMonth[isLeapYear(date.year) ? 'leapyear' : 'standard'][date.month - 1];\n  }\n\n  // eslint-disable-next-line @typescript-eslint/no-unused-vars\n  getMonthsInYear(date: AnyCalendarDate): number {\n    return 12;\n  }\n\n  getDaysInYear(date: AnyCalendarDate): number {\n    return isLeapYear(date.year) ? 366 : 365;\n  }\n\n  // eslint-disable-next-line @typescript-eslint/no-unused-vars\n  getYearsInEra(date: AnyCalendarDate): number {\n    return 9999;\n  }\n\n  getEras(): string[] {\n    return ['BC', 'AD'];\n  }\n\n  isInverseEra(date: AnyCalendarDate): boolean {\n    return date.era === 'BC';\n  }\n\n  balanceDate(date: Mutable<AnyCalendarDate>): void {\n    if (date.year <= 0) {\n      date.era = date.era === 'BC' ? 'AD' : 'BC';\n      date.year = 1 - date.year;\n    }\n  }\n}\n"],"names":[],"version":3,"file":"GregorianCalendar.module.js.map"}