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* @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\Component\Finder\Administrator\Indexer; \defined('_JEXEC') or die; use Joomla\String\StringHelper; use Wamania\Snowball\NotFoundException; use Wamania\Snowball\Stemmer\Stemmer; use Wamania\Snowball\StemmerFactory; /** * Language support class for the Finder indexer package. * * @since 4.0.0 */ class Language { /** * Language support instances container. * * @var Language[] * @since 4.0.0 */ protected static $instances = array(); /** * Language locale of the class * * @var string * @since 4.0.0 */ public $language; /** * Spacer to use between terms * * @var string * @since 4.0.0 */ public $spacer = ' '; /** * The stemmer object. * * @var Stemmer * @since 4.0.0 */ protected $stemmer = null; /** * Method to construct the language object. * * @since 4.0.0 */ public function __construct($locale = null) { if ($locale !== null) { $this->language = $locale; } // Use our generic language handler if no language is set if ($this->language === null) { $this->language = '*'; } try { $this->stemmer = StemmerFactory::create($this->language); } catch (NotFoundException $e) { // We don't have a stemmer for the language } } /** * Method to get a language support object. * * @param string $language The language of the support object. * * @return Language A Language instance. * * @since 4.0.0 */ public static function getInstance($language) { if (isset(self::$instances[$language])) { return self::$instances[$language]; } $locale = '*'; if ($language !== '*') { $locale = Helper::getPrimaryLanguage($language); $class = '\\Joomla\\Component\\Finder\\Administrator\\Indexer\\Language\\' . ucfirst($locale); if (class_exists($class)) { self::$instances[$language] = new $class; return self::$instances[$language]; } } self::$instances[$language] = new self($locale); return self::$instances[$language]; } /** * Method to tokenise a text string. * * @param string $input The input to tokenise. * * @return array An array of term strings. * * @since 4.0.0 */ public function tokenise($input) { $quotes = html_entity_decode('‘’'', ENT_QUOTES, 'UTF-8'); /* * Parsing the string input into terms is a multi-step process. * * Regexes: * 1. Remove everything except letters, numbers, quotes, apostrophe, plus, dash, period, and comma. * 2. Remove plus, dash, period, and comma characters located before letter characters. * 3. Remove plus, dash, period, and comma characters located after other characters. * 4. Remove plus, period, and comma characters enclosed in alphabetical characters. Ungreedy. * 5. Remove orphaned apostrophe, plus, dash, period, and comma characters. * 6. Remove orphaned quote characters. * 7. Replace the assorted single quotation marks with the ASCII standard single quotation. * 8. Remove multiple space characters and replaces with a single space. */ $input = StringHelper::strtolower($input); $input = preg_replace('#[^\pL\pM\pN\p{Pi}\p{Pf}\'+-.,]+#mui', ' ', $input); $input = preg_replace('#(^|\s)[+-.,]+([\pL\pM]+)#mui', ' $1', $input); $input = preg_replace('#([\pL\pM\pN]+)[+-.,]+(\s|$)#mui', '$1 ', $input); $input = preg_replace('#([\pL\pM]+)[+.,]+([\pL\pM]+)#muiU', '$1 $2', $input); $input = preg_replace('#(^|\s)[\'+-.,]+(\s|$)#mui', ' ', $input); $input = preg_replace('#(^|\s)[\p{Pi}\p{Pf}]+(\s|$)#mui', ' ', $input); $input = preg_replace('#[' . $quotes . ']+#mui', '\'', $input); $input = preg_replace('#\s+#mui', ' ', $input); $input = trim($input); // Explode the normalized string to get the terms. $terms = explode(' ', $input); return $terms; } /** * Method to stem a token. * * @param string $token The token to stem. * * @return string The stemmed token. * * @since 4.0.0 */ public function stem($token) { if ($this->stemmer !== null) { return $this->stemmer->stem($token); } return $token; } }