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<?php |
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namespace Fisharebest\ExtCalendar; |
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use InvalidArgumentException; |
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/** |
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* class GregorianCalendar - calculations for the (proleptic) Gregorian calendar. |
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* |
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* @author Greg Roach <[email protected]> |
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* @copyright (c) 2014-2020 Greg Roach |
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* @license This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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class GregorianCalendar extends JulianCalendar implements CalendarInterface |
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{ |
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/** |
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* The escape sequence used to indicate this calendar in GEDCOM files. |
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* |
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* @return string |
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*/ |
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public function gedcomCalendarEscape() |
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{ |
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return '@#DGREGORIAN@'; |
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} |
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/** |
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* @param int $year |
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* |
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* @return bool |
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*/ |
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public function isLeapYear($year) |
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{ |
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if ($year < 0) { |
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$year++; |
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} |
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return $year % 4 == 0 && $year % 100 != 0 || $year % 400 == 0; |
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} |
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/** |
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* Convert a Julian day number into a year/month/day. |
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* |
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* @param int $julian_day |
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* |
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* @return int[] |
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*/ |
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public function jdToYmd($julian_day) |
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{ |
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$a = $julian_day + 32044; |
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$b = (int) ((4 * $a + 3) / 146097); |
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$c = $a - (int) ($b * 146097 / 4); |
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$d = (int) ((4 * $c + 3) / 1461); |
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$e = $c - (int) ((1461 * $d) / 4); |
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$m = (int) ((5 * $e + 2) / 153); |
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$day = $e - (int) ((153 * $m + 2) / 5) + 1; |
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$month = $m + 3 - 12 * (int) ($m / 10); |
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$year = $b * 100 + $d - 4800 + (int) ($m / 10); |
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if ($year < 1) { |
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// 0 is 1 BCE, -1 is 2 BCE, etc. |
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$year--; |
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} |
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return array($year, $month, $day); |
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} |
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/** |
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* Convert a year/month/day into a Julian day number |
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* |
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* @param int $year |
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* @param int $month |
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* @param int $day |
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* |
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* @return int |
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*/ |
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public function ymdToJd($year, $month, $day) |
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{ |
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View Code Duplication |
if ($month < 1 || $month > $this->monthsInYear()) { |
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throw new InvalidArgumentException('Month ' . $month . ' is invalid for this calendar'); |
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} |
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if ($year < 0) { |
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// 1 BCE is 0, 2 BCE is -1, etc. |
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++$year; |
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} |
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$a = (int) ((14 - $month) / 12); |
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$year = $year + 4800 - $a; |
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$month = $month + 12 * $a - 3; |
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return $day + (int) ((153 * $month + 2) / 5) + 365 * $year + (int) ($year / 4) - (int) ($year / 100) + (int) ($year / 400) - 32045; |
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} |
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/** |
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* Get the number of days after March 21 that easter falls, for a given year. |
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* |
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* Uses the algorithm found in PHP’s ext/calendar/easter.c |
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* |
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* @param int $year |
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* |
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* @return int |
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*/ |
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public function easterDays($year) |
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{ |
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// The “golden” number |
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$golden = $year % 19 + 1; |
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// The “dominical” number (finding a Sunday) |
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$dom = ($year + (int) ($year / 4) - (int) ($year / 100) + (int) ($year / 400)) % 7; |
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if ($dom < 0) { |
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$dom += 7; |
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} |
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// The solar correction |
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$solar = (int) (($year - 1600) / 100) - (int) (($year - 1600) / 400); |
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// The lunar correction |
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$lunar = (int) ((int) (($year - 1400) / 100) * 8) / 25; |
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// The uncorrected “Paschal full moon” date |
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$pfm = (3 - 11 * $golden + $solar - $lunar) % 30; |
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if ($pfm < 0) { |
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$pfm += 30; |
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} |
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// The corrected “Paschal full moon” date |
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if ($pfm === 29 || $pfm === 28 && $golden > 11) { |
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$pfm--; |
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} |
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$tmp = (4 - $pfm - $dom) % 7; |
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if ($tmp < 0) { |
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$tmp += 7; |
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} |
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return $pfm + $tmp + 1; |
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} |
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} |
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fisharebest /
ext-calendar
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.