LanguageStemmer.php
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<?php
/**
* Joomla! Content Management System
*
* @copyright Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Language;
defined('JPATH_PLATFORM') or die;
/**
* Stemmer base class.
*
* @since 3.0.0
* @deprecated 4.0 Use wamania/php-stemmer
*/
abstract class LanguageStemmer
{
/**
* An internal cache of stemmed tokens.
*
* @var array
* @since 3.0.0
*/
protected $cache = array();
/**
* @var array LanguageStemmer instances.
* @since 3.0.0
*/
protected static $instances = array();
/**
* Method to get a stemmer, creating it if necessary.
*
* @param string $adapter The type of stemmer to load.
*
* @return LanguageStemmer A LanguageStemmer instance.
*
* @since 3.0.0
* @throws \RuntimeException on invalid stemmer.
*/
public static function getInstance($adapter)
{
// Only create one stemmer for each adapter.
if (isset(self::$instances[$adapter]))
{
return self::$instances[$adapter];
}
// Setup the adapter for the stemmer.
$class = 'Joomla\\CMS\\Language\\Stemmer\\' . ucfirst(trim($adapter));
// Check if a stemmer exists for the adapter.
if (!class_exists($class))
{
// Throw invalid adapter exception.
throw new \RuntimeException(\JText::sprintf('JLIB_STEMMER_INVALID_STEMMER', $adapter));
}
self::$instances[$adapter] = new $class;
return self::$instances[$adapter];
}
/**
* Method to stem a token and return the root.
*
* @param string $token The token to stem.
* @param string $lang The language of the token.
*
* @return string The root token.
*
* @since 3.0.0
*/
abstract public function stem($token, $lang);
}