From ShoutWiki with love

Change-Id: I8384acef88050ef221243125d95e0789c0b1b5e8

.gitignore

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+/composer.lock
+/node_modules/
+/vendor/
+*~
+*.kate-swp
+.*.swp

.gitreview

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+[gerrit]
+host=gerrit.wikimedia.org
+port=29418
+project=mediawiki/extensions/RandomSelection.git
+track=1
+defaultrebase=0

RandomSelection.class.php

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+<?php
+/**
+ * RandomSelection -- randomly displays one of the given options.
+ * Usage: <choose><option>A</option><option>B</option></choose>
+ * Optional parameter: <option weight="3"> == 3x weight given
+ *
+ * @file
+ * @ingroup Extensions
+ * @version 2.2
+ * @date 23 June 2015
+ * @author Ross McClure <http://www.mediawiki.org/wiki/User:Algorithm>
+ * @link https://www.mediawiki.org/wiki/Extension:RandomSelection Documentation
+ */
+class RandomSelection {
+	/**
+	 * Register the <choose> tag with the Parser.
+	 *
+	 * @param Parser $parser
+	 * @return bool
+	 */
+	public static function register( &$parser ) {
+		$parser->setHook( 'choose', array( __CLASS__, 'render' ) );
+		return true;
+	}
+
+	/**
+	 * Callback for register() which actually does all the processing.
+	 *
+	 * @param string $input User-supplied input
+	 * @param array $argv [unused]
+	 * @param Parser $parser
+	 */
+	public static function render( $input, $argv, $parser ) {
+		# Prevent caching
+		$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;
+			}
+		}
+
+		return $parser->recursiveTagParse( $input );
+	}
+}

extension.json

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+{
+	"name": "RandomSelection",
+	"version": "2.2",
+	"author": [
+		"Ross McClure"
+	],
+	"license-name": "GPL-2.0+",
+	"url": "https://www.mediawiki.org/wiki/Extension:RandomSelection",
+	"description": "Displays a random option from the given set",
+	"type": "parserhook",
+	"AutoloadClasses": {
+		"RandomSelection": "RandomSelection.class.php"
+	},
+	"Hooks": {
+		"ParserFirstCallInit": [
+			"RandomSelection::register"
+		]
+	},
+	"manifest_version": 1
+}