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2010-06-16T21:16:36Z

Created page with '<pre> <?php /* RandomSelection v2.1.3 -- 7/21/08 This extension randomly displays one of the given options. Usage: <choose><option>A</option><option>B</option></choose> …'

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<pre>
<?php
/*

RandomSelection v2.1.3 -- 7/21/08

This extension randomly displays one of the given options.

Usage: <choose><option>A</option><option>B</option></choose>
Optional parameter: <option weight="3"> == 3x weight given

Author: Ross McClure [http://www.mediawiki.org/wiki/User:Algorithm]
*/

//Avoid unstubbing $wgParser on setHook() too early on modern (1.12+) MW versions, as per r35980
if ( defined( 'MW_SUPPORTS_PARSERFIRSTCALLINIT' ) ) {
$wgHooks['ParserFirstCallInit'][] = 'wfRandomSelection';
} else {
$wgExtensionFunctions[] = 'wfRandomSelection';
}

$wgHooks['LanguageGetMagic'][] = 'efRandomSelection_Magic';

$wgExtensionCredits['parserhook'][] = array(
'name' => 'RandomSelection',
'url' => 'http://www.mediawiki.org/wiki/Extension:RandomSelection',
'version' => '2.1.3',
'author' => 'Ross McClure',
'description' => 'Displays a random option from the given set.'
);

function efRandomSelection_Magic( &$magicWords, $langCode) {
$magicWords['choose'] = array( 0, 'choose' );
return true;
}

function wfRandomSelection() {
global $wgParser;
$wgParser->setHook( 'choose', 'renderChosen' );
if ( defined( get_class( $wgParser ) . '::SFH_OBJECT_ARGS' ) ) {
$wgParser->setFunctionHook( 'choose', 'efRandomSelection_RenderPF_obj', SFH_OBJECT_ARGS );
} else {
$wgParser->setFunctionHook( 'choose', 'efRandomSelection_RenderPF');
}
return true;
}

function efRandomSelection_RenderPF_obj(&$parser, $frame, $args ) {
$options = array();
$r = 0;

//first one is not an object

$arg = array_shift( $args );
$parts = explode( '=', $arg, 2);
if ( count($parts) == 2 ) {
$options[] = array( intval(trim($parts[0])) , $parts[1] );
$r += intval(trim($parts[0]));
} elseif ( count($parts) == 1 ) {
$options[] = array( 1 , $parts[0] );
$r += 1;
}

foreach ($args as $arg) {
$bits = $arg->splitArg();
$nameNode = $bits['name'];
$index = $bits['index'];
$valueNode = $bits['value'];
if ( $index === '' ) {
$name = trim($frame->expand( $nameNode ));
$options[] = array( intval($name) , $valueNode );
$r += intval($name);
} else {
$options[] = array( 1 , $valueNode );
$r += 1;
}
}

# Choose an option at random
if($r <= 0) return '';
$r = mt_rand(1,$r);
for($i = 0; $i < count($options); $i++) {
$r -= $options[$i][0];
if($r <= 0) {
$output = $options[$i][1];
break;
}
}
return $frame->expand($output);
}

function efRandomSelection_RenderPF( &$parser /*,...*/ ) {
$args = func_get_args();
array_shift($args);
$parts = null;
$options = array();
$r = 0;
foreach ($args as $arg) {
//$parts = array_map( 'trim', explode( '=', $arg, 2));
$parts = explode( '=', $arg, 2);
if ( count($parts) == 2 ) {
$options[] = array( intval(trim($parts[0])) , $parts[1] );
$r += intval(trim($parts[0]));
} elseif ( count($parts) == 1 ) {
$options[] = array( 1 , $parts[0] );
$r += 1;
}
}

# Choose an option at random
if($r <= 0) return '';
$r = mt_rand(1,$r);
for($i = 0; $i < count($options); $i++) {
$r -= $options[$i][0];
if($r <= 0) {
$output = $options[$i][1];
break;
}
}
return $output;
}

function renderChosen( $input, $argv, $parser ) {
# Prevent caching
if (isset($argv['uncached'])) {
$parser->disableCache();
}

# Parse the options and calculate total weight
$len = preg_match_all("/<option(?:(?:\\s[^>]*?)?\\sweight=[\"']?([^\\s>]+))?"
. "(?:\\s[^>]*)?>([\\s\\S]*?)<\\/option>/", $input, $out);
$r = 0;
for($i = 0; $i < $len; $i++) {
if(strlen($out[1][$i])==0) $out[1][$i] = 1;
else $out[1][$i] = intval($out[1][$i]);
$r += $out[1][$i];
}

# Choose an option at random
if($r <= 0) return "";
$r = mt_rand(1,$r);
for($i = 0; $i < $len; $i++) {
$r -= $out[1][$i];
if($r <= 0) {
$input = $out[2][$i];
break;
}
}

# If running new parser, take the easy way out
if( defined( 'Parser::VERSION' ) && version_compare( Parser::VERSION, '1.6.1', '>' ) ) {
return $parser->recursiveTagParse($input);
}

# Otherwise, create new parser to handle rendering
$localParser = new Parser();

# Initialize defaults, then copy info from parent parser
$localParser->clearState();
$localParser->mTagHooks = $parser->mTagHooks;
$localParser->mTemplates = $parser->mTemplates;
$localParser->mTemplatePath = $parser->mTemplatePath;
$localParser->mFunctionHooks = $parser->mFunctionHooks;
$localParser->mFunctionSynonyms = $parser->mFunctionSynonyms;

# Render the chosen option
$output = $localParser->parse($input, $parser->mTitle,
$parser->mOptions, false, false);
return $output->getText();

}
</pre>

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