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<?php
/**
* webtrees: online genealogy
* Copyright (C) 2026 webtrees development team
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
declare(strict_types=1);
namespace Fisharebest\Webtrees\Services;
use Fisharebest\Webtrees\Gedcom;
/**
* Utilities for manipulating GEDCOM data.
*/
class GedcomService
{
// Some applications, such as FTM, use GEDCOM tag names instead of the tags.
private const array TAG_NAMES = [
'ABBREVIATION' => 'ABBR',
'ADDRESS' => 'ADDR',
'ADDRESS1' => 'ADR1',
'ADDRESS2' => 'ADR2',
'ADDRESS3' => 'ADR3',
'ADOPTION' => 'ADOP',
'AGENCY' => 'AGNC',
'ALIAS' => 'ALIA',
'ANCESTORS' => 'ANCE',
'ANCES_INTEREST' => 'ANCI',
'ANULMENT' => 'ANUL',
'ASSOCIATES' => 'ASSO',
'AUTHOR' => 'AUTH',
'BAPTISM-LDS' => 'BAPL',
'BAPTISM' => 'BAPM',
'BAR_MITZVAH' => 'BARM',
'BAS_MITZVAH' => 'BASM',
'BIRTH' => 'BIRT',
'BLESSING' => 'BLES',
'BURIAL' => 'BURI',
'CALL_NUMBER' => 'CALN',
'CASTE' => 'CAST',
'CAUSE' => 'CAUS',
'CENSUS' => 'CENS',
'CHANGE' => 'CHAN',
'CHARACTER' => 'CHAR',
'CHILD' => 'CHIL',
'CHRISTENING' => 'CHR',
'ADULT_CHRISTENING' => 'CHRA',
'CONCATENATION' => 'CONC',
'CONFIRMATION' => 'CONF',
'CONFIRMATION-LDS' => 'CONL',
'CONTINUED' => 'CONT',
'COPYRIGHT' => 'COPY',
'CORPORTATE' => 'CORP',
'CREMATION' => 'CREM',
'COUNTRY' => 'CTRY',
'DEATH' => 'DEAT',
'DESCENDANTS' => 'DESC',
'DESCENDANTS_INT' => 'DESI',
'DESTINATION' => 'DEST',
'DIVORCE' => 'DIV',
'DIVORCE_FILED' => 'DIVF',
'PHY_DESCRIPTION' => 'DSCR',
'EDUCATION' => 'EDUC',
'EMIGRATION' => 'EMIG',
'ENDOWMENT' => 'ENDL',
'ENGAGEMENT' => 'ENGA',
'EVENT' => 'EVEN',
'FAMILY' => 'FAM',
'FAMILY_CHILD' => 'FAMC',
'FAMILY_FILE' => 'FAMF',
'FAMILY_SPOUSE' => 'FAMS',
'FACIMILIE' => 'FAX',
'FIRST_COMMUNION' => 'FCOM',
'FORMAT' => 'FORM',
'PHONETIC' => 'FONE',
'GEDCOM' => 'GEDC',
'GIVEN_NAME' => 'GIVN',
'GRADUATION' => 'GRAD',
'HEADER' => 'HEAD',
'HUSBAND' => 'HUSB',
'IDENT_NUMBER' => 'IDNO',
'IMMIGRATION' => 'IMMI',
'INDIVIDUAL' => 'INDI',
'LANGUAGE' => 'LANG',
'LATITUDE' => 'LATI',
'LONGITUDE' => 'LONG',
'MARRIAGE_BANN' => 'MARB',
'MARR_CONTRACT' => 'MARC',
'MARR_LICENSE' => 'MARL',
'MARRIAGE' => 'MARR',
'MEDIA' => 'MEDI',
'NATIONALITY' => 'NATI',
'NATURALIZATION' => 'NATU',
'CHILDREN_COUNT' => 'NCHI',
'NICKNAME' => 'NICK',
'MARRIAGE_COUNT' => 'NMR',
'NAME_PREFIX' => 'NPFX',
'NAME_SUFFIX' => 'NSFX',
'OBJECT' => 'OBJE',
'OCCUPATION' => 'OCCU',
'ORDINANCE' => 'ORDI',
'ORDINATION' => 'ORDN',
'PEDIGREE' => 'PEDI',
'PHONE' => 'PHON',
'PLACE' => 'PLAC',
'POSTAL_CODE' => 'POST',
'PROBATE' => 'PROB',
'PROPERTY' => 'PROP',
'PUBLICATION' => 'PUBL',
'QUALITY_OF_DATA' => 'QUAY',
'REFERENCE' => 'REFN',
'RELATIONSHIP' => 'RELA',
'RELIGION' => 'RELI',
'REPOSITORY' => 'REPO',
'RESIDENCE' => 'RESI',
'RESTRICTION' => 'RESN',
'RETIREMENT' => 'RETI',
'REC_FILE_NUMBER' => 'RFN',
'REC_ID_NUMBER' => 'RIN',
'ROMANIZED' => 'ROMN',
'SEALING_CHILD' => 'SLGC',
'SEALING_SPOUSE' => 'SLGS',
'SOURCE' => 'SOUR',
'SURN_PREFIX' => 'SPFX',
'SOC_SEC_NUMBER' => 'SSN',
'STATE' => 'STAE',
'STATUS' => 'STAT',
'SUBMITTER' => 'SUBM',
'SUBMISSION' => 'SUBN',
'SURNAME' => 'SURN',
'TEMPLE' => 'TEMP',
'TITLE' => 'TITL',
'TRAILER' => 'TRLR',
'VERSION' => 'VERS',
'WEB' => 'WWW',
'_DEATH_OF_SPOUSE' => 'DETS',
'_DEGREE' => '_DEG',
'_MEDICAL' => '_MCL',
'_MILITARY_SERVICE' => '_MILT',
];
// Custom GEDCOM tags used by other applications, with direct synonyms
private const array TAG_SYNONYMS = [
// Convert PhpGedView tag to webtrees
'_PGVU' => '_WT_USER',
'_PGV_OBJS' => '_WT_OBJE_SORT',
];
/**
* Convert a GEDCOM tag to a canonical form.
*
* @param string $tag
*
* @return string
*/
public function canonicalTag(string $tag): string
{
$tag = strtoupper($tag);
$tag = self::TAG_NAMES[$tag] ?? self::TAG_SYNONYMS[$tag] ?? $tag;
return $tag;
}
public function readLatitude(string $text): float|null
{
return $this->readDegrees($text, Gedcom::LATITUDE_NORTH, Gedcom::LATITUDE_SOUTH);
}
public function readLongitude(string $text): float|null
{
return $this->readDegrees($text, Gedcom::LONGITUDE_EAST, Gedcom::LONGITUDE_WEST);
}
private function readDegrees(string $text, string $positive, string $negative): float|null
{
$text = trim($text);
$hemisphere = substr($text, 0, 1);
$degrees = substr($text, 1);
// Match a valid GEDCOM format
if (is_numeric($degrees)) {
$hemisphere = strtoupper($hemisphere);
$degrees = (float) $degrees;
if ($hemisphere === $positive) {
return $degrees;
}
if ($hemisphere === $negative) {
return -$degrees;
}
}
// Just a number?
if (is_numeric($text)) {
return (float) $text;
}
// Can't match anything.
return null;
}
}
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