MediaWiki Implementation
Note: Version 1.01 of geohashes.php is currently installed on this wiki, as well as Variables.php.
A MediaWiki extension to allow us to handle Geohashes a little nicer and more automatically. Any questions to the talk page here, although I would appreciate a poke on my talk page also.
Note that the whole algorithm is not fully implemented, because those on IRC said that templates could do the rest.
--Edgemaster 21:39, 23 May 2008 (UTC)
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Contents
The Code
Feel free to tidy it up, poke an admin if you feel your changes are worthy to be deployed on this wiki.
<?php $wgExtensionCredits[$type][] = array( 'name' => "Geohashing MediaWiki Parser Functions", 'description' => "Adds {{#md5}} and {{#dow}} handlers", 'descriptionmsg' => "", 'version' => "1.01", 'author' => "Edgemaster (grand.edgemaster@gmail.com)", 'url' => "http://wiki.xkcd.com/geohashing/MediaWiki_Implementation" ); $wgExtensionFunctions[] = 'geohashingFunction_Setup'; $wgHooks['LanguageGetMagic'][] = 'geohashingFunction_Magic'; function geohashingFunction_Setup() { global $wgParser; $wgParser->setFunctionHook( 'md5', 'geohashingMd5Function_Render' ); $wgParser->setFunctionHook( 'dow', 'geohashingDowFunction_Render' ); } function geohashingFunction_Magic( &$magicWords, $langCode ) { $magicWords['md5'] = array( 0, 'md5' ); $magicWords['dow'] = array( 0, 'dow' ); return true; } function geohashingMd5Function_Render( &$parser, $src = '', $half = 0, $decimal = 0) { $md5 = md5(trim($src)); if(!$half) return $md5; $md5 = substr($md5, ($half-1)*16, 15); if(!$decimal) return $md5; $dec = ('0x'.$md5) / pow(16,15); return $dec; } function geohashingDowFunction_Render( &$parser, $Y = 0, $m = 0, $d = 0) { foreach(array('Y', 'm', 'd') as $var) { $$var = intval($$var); if($$var < 10) $$var = '0' . $$var; if(!intval($$var)) $$var = date($var); } return trim(@file_get_contents("http://irc.peeron.com/xkcd/map/data/$Y/$m/$d")); // file_get_contents returns nothing on http error, we hide the warning from php } ?>
Changelog
- v1.01 - 1 Jul 2008 Passing all 16 hex-characters of a half-hash causes PHP to misinterpret sign when decimalising, so instead we only pass the first 15... besides, that still gives microscopic accuracy (~100 femtometres). Hence the fifteens shown in lines 30 and 33 above. --Tim P 19:13, 1 July 2008 (UTC)
In-wiki Usage
This extension adds two new parser functions: {{#md5}} and {{#dow}}.
#md5
md5s a string, optionally splitting into halves and decimalising.
{{#md5:string|halve|decimal}}
Parameters:
- string: the string to md5
- halve: (optional) splits the hash into two, as required by The Algorithm. 0 = do not half, 1 = first half, 2 = 2nd half. Defaults to 0.
- decimal: (optional) converts the half to decimal if set. Defaults to 0, requires halve to be set to 1 or 2!
Examples:
- {{#md5:testing testing!}}: f9da4c546dff04d46e1fab3ca0456b42
- {{#md5:2005-05-26-10458.68}}: db9318c2259923d08b672cb305440f97
- {{#md5:2005-05-26-10458.68|0}}: db9318c2259923d08b672cb305440f97
- {{#md5:2005-05-26-10458.68|1}}: db9318c2259923d
- {{#md5:2005-05-26-10458.68|2}}: 8b672cb305440f9
- {{#md5:2005-05-26-10458.68|1|1}}: 0.857713267707
- {{#md5:2005-05-26-10458.68|2|1}}: 0.54454306955928
#dow
Fetches the opening Dow Index for a date from the irc.peeron.com service.
{{#dow:year|month|day}}
Parameters:
- year: 4 digit year
- month: month (1 or 2 digits are acceptable)
- day: day (1 or 2 digits are acceptable)
The only validation done is to check the values are non-null. If any of the 3 are null (or all of the 3), then today's date will be used instead. (Always requires the colon to produce a result)
Examples:
- {{#dow:}}: 41869.82
- {{#dow:2005|05|26}}: 10458.68
- These will fail:
- (lack of data) {{#dow:1854|05|26}}:
- (bad syntax) {{#dow}}: {{#dow}}
Variables Extension too plz
Installing
Copy this into a file called $mediwikipath/extensions/Variables/Variables.php:
<?php if ( !defined( 'MEDIAWIKI' ) ) { die( 'This file is a MediaWiki extension, it is not a valid entry point' ); } $wgExtensionFunctions[] = 'wfSetupVariables'; $wgExtensionCredits['parserhook'][] = array( 'name' => 'Variables', 'url' => 'http://www.mediawiki.org/wiki/Extension:VariablesExtension', 'author' => 'Rob Adams', 'description' => 'Define page-scoped variables' ); $wgHooks['LanguageGetMagic'][] = 'wfVariablesLanguageGetMagic'; class ExtVariables { var $mVariables; function vardefine( &$parser, $expr = '', $value = '' ) { $this->mVariables[$expr] = $value; return ''; } function varf( &$parser, $expr = '' ) { return $this->mVariables[$expr]; } } function wfSetupVariables() { global $wgParser, $wgMessageCache, $wgExtVariables, $wgMessageCache, $wgHooks; $wgExtVariables = new ExtVariables; $wgParser->setFunctionHook( 'vardefine', array( &$wgExtVariables, 'vardefine' ) ); $wgParser->setFunctionHook( 'var', array( &$wgExtVariables, 'varf' ) ); } function wfVariablesLanguageGetMagic( &$magicWords, $langCode = 0 ) { require_once( dirname( __FILE__ ) . '/Variables.i18n.php' ); foreach( efVariablesWords( $langCode ) as $word => $trans ) $magicWords[$word] = $trans; return true; }
Copy this into a file called $mediwikipath/extensions/Variables/Variables.i18n.php:
<?php /** * Get translated magic words, if available * * @param string $lang Language code * @return array */ function efVariablesWords( $lang ) { $words = array(); /** * English */ $words['en'] = array( 'var' => array( 0, 'var' ), 'vardefine' => array( 0, 'vardefine' ), ); # English is used as a fallback, and the English synonyms are # used if a translation has not been provided for a given word return ( $lang == 'en' || !isset( $words[$lang] ) ) ? $words['en'] : array_merge( $words['en'], $words[$lang] ); }
Then add
require_once( "$IP/extensions/Variables/Variables.php" );
to the end of LocalSettings.php.