mirror of
https://github.com/YunoHost-Apps/webtrees_ynh.git
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112 lines
3 KiB
PHP
112 lines
3 KiB
PHP
<?php
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/**
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* webtrees: online genealogy
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* Copyright (C) 2016 webtrees development team
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* 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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* 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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* 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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namespace Fisharebest\Webtrees\Date;
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use Fisharebest\ExtCalendar\JulianCalendar;
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use Fisharebest\Webtrees\I18N;
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/**
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* Definitions for the Julian Proleptic calendar
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* (Proleptic means we extend it backwards, prior to its introduction in 46BC)
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*/
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class JulianDate extends CalendarDate {
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/** @var bool True for dates recorded in new-style/old-style format, e.g. 2 FEB 1743/44 */
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private $new_old_style = false;
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/**
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* Create a date from either:
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* a Julian day number
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* day/month/year strings from a GEDCOM date
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* another CalendarDate object
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*
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* @param array|int|CalendarDate $date
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*/
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public function __construct($date) {
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$this->calendar = new JulianCalendar;
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parent::__construct($date);
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}
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/**
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* Most years are 1 more than the previous, but not always (e.g. 1BC->1AD)
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*
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* @param int $year
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*
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* @return int
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*/
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protected function nextYear($year) {
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if ($year == -1) {
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return 1;
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} else {
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return $year + 1;
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}
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}
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/**
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* Process new-style/old-style years and years BC
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*
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* @param string $year
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*
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* @return int
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*/
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protected function extractYear($year) {
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if (preg_match('/^(\d\d\d\d)\/\d{1,4}$/', $year, $match)) {
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// Assume the first year is correct
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$this->new_old_style = true;
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return $match[1] + 1;
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} elseif (preg_match('/^(\d+) B\.C\.$/', $year, $match)) {
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return -$match[1];
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} else {
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return (int) $year;
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}
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}
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/**
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* Generate the %Y format for a date.
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*
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* @return string
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*/
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protected function formatLongYear() {
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if ($this->y < 0) {
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return /* I18N: BCE=Before the Common Era, for Julian years < 0. See http://en.wikipedia.org/wiki/Common_Era */
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I18N::translate('%s BCE', I18N::digits(-$this->y));
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} else {
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if ($this->new_old_style) {
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return I18N::translate('%s CE', I18N::digits(sprintf('%d/%02d', $this->y - 1, $this->y % 100)));
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} else {
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return /* I18N: CE=Common Era, for Julian years > 0. See http://en.wikipedia.org/wiki/Common_Era */
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I18N::translate('%s CE', I18N::digits($this->y));
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}
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}
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}
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/**
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* Generate the %E format for a date.
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*
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* @return string
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*/
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protected function formatGedcomYear() {
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if ($this->y < 0) {
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return sprintf('%04d B.C.', -$this->y);
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} else {
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if ($this->new_old_style) {
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return sprintf('%04d/%02d', $this->y - 1, $this->y % 100);
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} else {
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return sprintf('%04d', $this->y);
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}
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}
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}
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}
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