languageconverter.php

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						}
					}
				}
			}
			else {
				$text .= $marked[0];
			}
			if(array_key_exists(1, $marked))
				$text .= $this->autoConvert($marked[1]);
		}

		return $text;
	}

	/**
	 * parse the manually marked conversion rule
	 * @param string $rule the text of the rule
	 * @return array of the translation in each variant
	 * @private
	 */
	function parseManualRule($rules, $flags=array()) {

		$choice = explode($this->mMarkup['varsep'], $rules);
		$carray = array();
		if(sizeof($choice) == 1) {
			/* a single choice */
			foreach($this->mVariants as $v)
				$carray[$v] = $choice[0];
		}
		else {
			foreach($choice as $c) {
				$v = explode($this->mMarkup['codesep'], $c);
				if(sizeof($v) != 2) // syntax error, skip
					continue;
				$carray[trim($v[0])] = trim($v[1]);
			}
		}
		return $carray;
	}

	/**
	 * if a language supports multiple variants, it is
	 * possible that non-existing link in one variant
	 * actually exists in another variant. this function
	 * tries to find it. See e.g. LanguageZh.php
	 *
	 * @param string $link the name of the link
	 * @param mixed $nt the title object of the link
	 * @return null the input parameters may be modified upon return
     * @access public
	 */
	function findVariantLink( &$link, &$nt ) {
		static $count=0; //used to limit this operation
		static $cache=array();
		global $wgDisableLangConversion;
		$pref = $this->getPreferredVariant();
		$ns=0;
		if(is_object($nt))
			$ns = $nt->getNamespace();
		if( $count > 50 && $ns != NS_CATEGORY )
			return;
		$count++;
		$variants = $this->autoConvertToAllVariants($link);
		if($variants == false) //give up
			return;
		foreach( $variants as $v ) {
			if(isset($cache[$v]))
				continue;
			$cache[$v] = 1;
			$varnt = Title::newFromText( $v, $ns );
			if( $varnt && $varnt->getArticleID() > 0 ) {
				$nt = $varnt;
				if( !$wgDisableLangConversion )
					$link = $v;
				break;
			}
		}
	}

    /**
     * returns language specific hash options
     *
     * @access public
     */
	function getExtraHashOptions() {
		$variant = $this->getPreferredVariant();
		return '!' . $variant ;
	}

    /**
     * get title text as defined in the body of the article text
     *
     * @access public
     */
	function getParsedTitle() {
		return $this->mTitleDisplay;
	}

	/**
     * a write lock to the cache
     *
     * @private
     */
	function lockCache() {
		global $wgMemc;
		$success = false;
		for($i=0; $i<30; $i++) {
			if($success = $wgMemc->add($this->mCacheKey . "lock", 1, 10))
				break;
			sleep(1);
		}
		return $success;
	}

	/**
     * unlock cache
     *
     * @private
     */
	function unlockCache() {
		global $wgMemc;
		$wgMemc->delete($this->mCacheKey . "lock");
	}


	/**
     * Load default conversion tables
     * This method must be implemented in derived class
     *
     * @private
     */
	function loadDefaultTables() {
		$name = get_class($this);
		wfDie("Must implement loadDefaultTables() method in class $name");
	}

	/**
     * load conversion tables either from the cache or the disk
     * @private
     */
	function loadTables($fromcache=true) {
		global $wgMemc;
		if( $this->mTablesLoaded )
			return;
		$this->mTablesLoaded = true;
		if($fromcache) {
			$this->mTables = $wgMemc->get( $this->mCacheKey );
			if( !empty( $this->mTables ) ) //all done
				return;
		}
		// not in cache, or we need a fresh reload.
		// we will first load the default tables
		// then update them using things in MediaWiki:Zhconversiontable/*
		global $wgMessageCache;
		$this->loadDefaultTables();
		foreach($this->mVariants as $var) {
			$cached = $this->parseCachedTable($var);
			$this->mTables[$var] = array_merge($this->mTables[$var], $cached);
		}

		$this->postLoadTables();

		if($this->lockCache()) {
			$wgMemc->set($this->mCacheKey, $this->mTables, 43200);
			$this->unlockCache();
		}
	}

    /**
     * Hook for post processig after conversion tables are loaded
     *
     */
	function postLoadTables() {}

    /**
     * Reload the conversion tables
     *
     * @private
     */
	function reloadTables() {
		if($this->mTables)
			unset($this->mTables);
		$this->mTablesLoaded = false;
		$this->loadTables(false);
	}


	/**
     * parse the conversion table stored in the cache
     *
     * the tables should be in blocks of the following form:

     *		-{
     *			word => word ;
     *			word => word ;
     *			...
     *		}-
     *
     *	to make the tables more manageable, subpages are allowed
     *	and will be parsed recursively if $recursive=true
     *
     * @private
	 */
	function parseCachedTable($code, $subpage='', $recursive=true) {
		global $wgMessageCache;
		static $parsed = array();

		if(!is_object($wgMessageCache))
			return array();

		$key = 'Conversiontable/'.$code;
		if($subpage)
			$key .= '/' . $subpage;

		if(array_key_exists($key, $parsed))
			return array();


		$txt = $wgMessageCache->get( $key, true, true, true );

		// get all subpage links of the form
		// [[MediaWiki:conversiontable/zh-xx/...|...]]
		$linkhead = $this->mLangObj->getNsText(NS_MEDIAWIKI) . ':Conversiontable';
		$subs = explode('[[', $txt);
		$sublinks = array();
		foreach( $subs as $sub ) {
			$link = explode(']]', $sub, 2);
			if(count($link) != 2)
				continue;
			$b = explode('|', $link[0]);
			$b = explode('/', trim($b[0]), 3);
			if(count($b)==3)
				$sublink = $b[2];
			else
				$sublink = '';

			if($b[0] == $linkhead && $b[1] == $code) {
				$sublinks[] = $sublink;
			}
		}


		// parse the mappings in this page
		$blocks = explode($this->mMarkup['begin'], $txt);
		array_shift($blocks);
		$ret = array();
		foreach($blocks as $block) {
			$mappings = explode($this->mMarkup['end'], $block, 2);
			$stripped = str_replace(array("'", '"', '*','#'), '', $mappings[0]);
			$table = explode( ';', $stripped );
			foreach( $table as $t ) {
				$m = explode( '=>', $t );
				if( count( $m ) != 2)
					continue;
				// trim any trailling comments starting with '//'
				$tt = explode('//', $m[1], 2);
				$ret[trim($m[0])] = trim($tt[0]);
			}
		}
		$parsed[$key] = true;


		// recursively parse the subpages
		if($recursive) {
			foreach($sublinks as $link) {
				$s = $this->parseCachedTable($code, $link, $recursive);
				$ret = array_merge($ret, $s);
			}
		}

		if ($this->mUcfirst) {
			foreach ($ret as $k => $v) {
				$ret[LanguageUtf8::ucfirst($k)] = LanguageUtf8::ucfirst($v);
			}
		}
		return $ret;
	}

	/**
	 * Enclose a string with the "no conversion" tag. This is used by
	 * various functions in the Parser
	 *
	 * @param string $text text to be tagged for no conversion
	 * @return string the tagged text
	*/
	function markNoConversion($text) {
		# don't mark if already marked
		if(strpos($text, $this->mMarkup['begin']) ||
 		   strpos($text, $this->mMarkup['end']))
			return $text;

		$ret = $this->mMarkup['begin'] . $text . $this->mMarkup['end'];
		return $ret;
	}

	/**
	 * convert the sorting key for category links. this should make different
	 * keys that are variants of each other map to the same key
	*/
	function convertCategoryKey( $key ) {
		return $key;
	}
	/**
     * hook to refresh the cache of conversion tables when
     * MediaWiki:conversiontable* is updated
     * @private
	*/
	function OnArticleSaveComplete($article, $user, $text, $summary, $isminor, $iswatch, $section) {
		$titleobj = $article->getTitle();
		if($titleobj->getNamespace() == NS_MEDIAWIKI) {
            /*
			global $wgContLang; // should be an LanguageZh.
			if(get_class($wgContLang) != 'languagezh')
				return true;
            */
			$title = $titleobj->getDBkey();
			$t = explode('/', $title, 3);
			$c = count($t);
			if( $c > 1 && $t[0] == 'Conversiontable' ) {
				if(in_array($t[1], $this->mVariants)) {
					$this->reloadTables();
				}
			}
		}
		return true;
	}
}

?>