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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 HEBREW_EPOCH = 347997;\n\n// Hebrew date calculations are performed in terms of days, hours, and\n// \"parts\" (or halakim), which are 1/1080 of an hour, or 3 1/3 seconds.\nconst HOUR_PARTS = 1080;\nconst DAY_PARTS  = 24 * HOUR_PARTS;\n\n// An approximate value for the length of a lunar month.\n// It is used to calculate the approximate year and month of a given\n// absolute date.\nconst MONTH_DAYS = 29;\nconst MONTH_FRACT = 12 * HOUR_PARTS + 793;\nconst MONTH_PARTS = MONTH_DAYS * DAY_PARTS + MONTH_FRACT;\n\nfunction isLeapYear(year: number) {\n  return mod(year * 7 + 1, 19) < 7;\n}\n\n// Test for delay of start of new year and to avoid\n// Sunday, Wednesday, and Friday as start of the new year.\nfunction hebrewDelay1(year: number) {\n  let months = Math.floor((235 * year - 234) / 19);\n  let parts = 12084 + 13753 * months;\n  let day = months * 29 + Math.floor(parts / 25920);\n\n  if (mod(3 * (day + 1), 7) < 3) {\n    day += 1;\n  }\n\n  return day;\n}\n\n// Check for delay in start of new year due to length of adjacent years\nfunction hebrewDelay2(year: number) {\n  let last = hebrewDelay1(year - 1);\n  let present = hebrewDelay1(year);\n  let next = hebrewDelay1(year + 1);\n\n  if (next - present === 356) {\n    return 2;\n  }\n\n  if (present - last === 382) {\n    return 1;\n  }\n\n  return 0;\n}\n\nfunction startOfYear(year: number) {\n  return hebrewDelay1(year) + hebrewDelay2(year);\n}\n\nfunction getDaysInYear(year: number) {\n  return startOfYear(year + 1) - startOfYear(year);\n}\n\nfunction getYearType(year: number) {\n  let yearLength = getDaysInYear(year);\n\n  if (yearLength > 380) {\n    yearLength -= 30; // Subtract length of leap month.\n  }\n\n  switch (yearLength) {\n    case 353:\n      return 0; // deficient\n    case 354:\n      return 1; // normal\n    case 355:\n      return 2; // complete\n  }\n}\n\nfunction getDaysInMonth(year: number, month: number): number {\n  // Normalize month numbers from 1 - 13, even on non-leap years\n  if (month >= 6 && !isLeapYear(year)) {\n    month++;\n  }\n\n  // First of all, dispose of fixed-length 29 day months\n  if (month === 4 || month === 7 || month === 9 || month === 11 || month === 13) {\n    return 29;\n  }\n\n  let yearType = getYearType(year);\n\n  // If it's Heshvan, days depend on length of year\n  if (month === 2) {\n    return yearType === 2 ? 30 : 29;\n  }\n\n  // Similarly, Kislev varies with the length of year\n  if (month === 3) {\n    return yearType === 0 ? 29 : 30;\n  }\n\n  // Adar I only exists in leap years\n  if (month === 6) {\n    return isLeapYear(year) ? 30 : 0;\n  }\n\n  return 30;\n}\n\n/**\n * The Hebrew calendar is used in Israel and around the world by the Jewish faith.\n * Years include either 12 or 13 months depending on whether it is a leap year.\n * In leap years, an extra month is inserted at month 6.\n */\nexport class HebrewCalendar implements Calendar {\n  identifier: CalendarIdentifier = 'hebrew';\n\n  fromJulianDay(jd: number): CalendarDate {\n    let d = jd - HEBREW_EPOCH;\n    let m = (d * DAY_PARTS) / MONTH_PARTS;           // Months (approx)\n    let year = Math.floor((19 * m + 234) / 235) + 1; // Years (approx)\n    let ys = startOfYear(year);                      // 1st day of year\n    let dayOfYear = Math.floor(d - ys);\n\n    // Because of the postponement rules, it's possible to guess wrong.  Fix it.\n    while (dayOfYear < 1) {\n      year--;\n      ys = startOfYear(year);\n      dayOfYear = Math.floor(d - ys);\n    }\n\n    // Now figure out which month we're in, and the date within that month\n    let month = 1;\n    let monthStart = 0;\n    while (monthStart < dayOfYear) {\n      monthStart += getDaysInMonth(year, month);\n      month++;\n    }\n\n    month--;\n    monthStart -= getDaysInMonth(year, month);\n\n    let day = dayOfYear - monthStart;\n    return new CalendarDate(this, year, month, day);\n  }\n\n  toJulianDay(date: AnyCalendarDate): number {\n    let jd = startOfYear(date.year);\n    for (let month = 1; month < date.month; month++) {\n      jd += getDaysInMonth(date.year, month);\n    }\n\n    return jd + date.day + HEBREW_EPOCH;\n  }\n\n  getDaysInMonth(date: AnyCalendarDate): number {\n    return getDaysInMonth(date.year, date.month);\n  }\n\n  getMonthsInYear(date: AnyCalendarDate): number {\n    return isLeapYear(date.year) ? 13 : 12;\n  }\n\n  getDaysInYear(date: AnyCalendarDate): number {\n    return getDaysInYear(date.year);\n  }\n\n  getYearsInEra(): number {\n    // 6239 gregorian\n    return 9999;\n  }\n\n  getEras(): string[] {\n    return ['AM'];\n  }\n\n  balanceYearMonth(date: Mutable<AnyCalendarDate>, previousDate: AnyCalendarDate): void {\n    // Keep date in the same month when switching between leap years and non leap years\n    if (previousDate.year !== date.year) {\n      if (isLeapYear(previousDate.year) && !isLeapYear(date.year) && previousDate.month > 6) {\n        date.month--;\n      } else if (!isLeapYear(previousDate.year) && isLeapYear(date.year) && previousDate.month > 6) {\n        date.month++;\n      }\n    }\n  }\n}\n"],"names":[],"version":3,"file":"HebrewCalendar.module.js.map"}