Extension:RomanNumbers

This extension stores its source code on a editable wiki page rather than in a code repository. As a result, this code may be maliciously altered.
It may contain security vulnerabilities, and will not receive localisation updates from translatewiki.net . Developers are strongly encouraged to host their code in a code repository rather than a wiki page so that the extension can be properly maintained, reviewed, and kept secure.

This extension is currently not actively maintained! Although it may still work, any bug reports or feature requests will more than likely be ignored.

**MediaWiki extensions manual**
RomanNumbers Release status: unmaintained
Implementation	Parser extension , Parser function
Description	Convert a roman number to an arabic one or vice versa.
Author(s)	Massimiliano Salvemini
Latest version	3.0 (2021年11月17日)
MediaWiki	1.31+
Hooks used ParserFirstCallInit
Licence	GNU General Public License 2.0 or later
Download	see code below

The RomanNumbers extension adds a parser function that converts one arabic number to a roman number or vice versa. If the argument is a string, it try to parse the string and convert it in an arabic number, while, if the argument is an arabic number, the parser converts it in a roman number.

The allowed range is from 1 to 9999 on the conversion arabic to roman, while when converting a roman number to an arabic one the conversion range is limited only by PHP variable's size. <roman>MCLVI</roman>

Examples

[edit ]

{{#tag:123}} returns CXXIII

{{#tag:MDXCII}} returns 1,592

{{#tag:MyDzXCII}} returns always 1,592 (unrecognized chars are skipped)

{{#tag:123MII}} returns always 1,002 (unrecognized chars are skipped)

Installation

[edit ]

Copy the code into a file called "RomanNumbers.php" and place the file(s) in a directory called RomanNumbers in your extensions/ folder.
Add the following code at the bottom of your LocalSettings.php file:
```
require_once "$IP/extensions/RomanNumbers/RomanNumbers.php";
```
Yes Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

Code

[edit ]

RomanNumbers.php

<?php
if (!defined('MEDIAWIKI'))
 die(' This file is a MediaWiki extension, it is not a valid entry point '
);
$wgExtensionCredits['parserhook'][] = array(
 'name' => 'RomanNumbers',
 'author' => array(
		'Massimiliano Salvemini',
		'Hakob Barseghyan'
		),
 'version' => '3.0',
 'license-name' => 'GPL-2.0-or-later',
 'url' => 'https://www.mediawiki.org/wiki/Extension:RomanNumbers', 
 'description' => 'Converts an Arabic number to a Roman number and vice versa'
);
$magicWords = [];
$magicWords['en'] = [ 'roman' => [ 0, 'roman' ] ];
class RomanNumbers {
 //Conversion: Roman Numeral to Integer
 public static function toArabic($roman) {
 static $conv = array(
 array("letter" => 'I', "number" => 1),
 array("letter" => 'V', "number" => 5),
 array("letter" => 'X', "number" => 10),
 array("letter" => 'L', "number" => 50),
 array("letter" => 'C', "number" => 100),
 array("letter" => 'D', "number" => 500),
 array("letter" => 'M', "number" => 1000),
 array("letter" => 0, "number" => 0)
); 
$arabic = 0;
$state = 0;
$sidx = 0;
$len = strlen($roman);
while ($len > 0) {
 $i = 0;
 $sidx = $len -1;
 while ($conv[$i]["number"] > 0) 
 {
 if (strtoupper($roman[$sidx]) == $conv[$i]["letter"]) 
 {
 if ($state > $conv[$i]["number"]) 
 {
 $arabic -= $conv[$i]["number"];
 }
 else 
 {
 $arabic += $conv[$i]["number"];
 $state = $conv[$i]["number"];
 }
 }
 $i++;
 }
 $len--;
 }
return($arabic);
}
public static function toRoman($num) {
 if ($num < 0 || $num > 9999) return -1;
 $romanOnes = array(1=> "I",2=>"II",3=>"III",4=>"IV", 5=>"V", 6=>"VI", 7=>"VII", 8=>"VIII", 9=>"IX" );
 $romanTens = array(1=> "X", 2=>"XX", 3=>"XXX", 4=>"XL", 5=>"L", 6=>"LX", 7=>"LXX",8=>"LXXX", 9=>"XC");
 $romanHund = array(1=> "C", 2=>"CC", 3=>"CCC", 4=>"CD", 5=>"D", 6=>"DC", 7=>"DCC",8=>"DCCC", 9=>"CM");
 $romanThou = array(1=> "M", 2=>"MM", 3=>"MMM", 4=>"MMMM", 5=>"MMMMM", 6=>"MMMMMM",7=>"MMMMMMM", 8=>"MMMMMMMM", 9=>"MMMMMMMMM");
 $ones = $num % 10;
 $tens = ($num - $ones) % 100;
 $hund = ($num - $tens - $ones) % 1000;
 $thou = ($num - $hund - $tens - $ones) % 10000;
 $tens = $tens / 10;
 $hund = $hund / 100;
 $thou = $thou / 1000;
 $romanNum = '';
 if ($thou) $romanNum .= $romanThou[$thou];
 if ($hund) $romanNum .= $romanHund[$hund];
 if ($tens) $romanNum .= $romanTens[$tens];
 if ($ones) $romanNum .= $romanOnes[$ones];
 return $romanNum;
 }
}
$wgHooks['ParserFirstCallInit'] = 'onParserFirstCallInit';
function onParserFirstCallInit($parser) {
 
 $parser->setFunctionHook( 'tag', 'wfRomanParse_Render' );
}
function wfRomanParse_Render(&$parser, $param1 = '') {
 return convertRomanNumber($param1);
}
$wgAjaxExportList[] = "convertRomanNumber";
function convertRomanNumber($num) {
 if (is_numeric($num)) {
 if (($num > 9999)||($num<1)) return "error";
 return RomanNumbers::toRoman($num);
 } 
 else
 return RomanNumbers::toArabic($num);
}

Retrieved from "https://www.mediawiki.org/w/index.php?title=Extension:RomanNumbers&oldid=6121730"