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<?php
/**
* SearchWP Stemmer.
*
* @package SearchWP
* @author Jon Christopher
*/
namespace SearchWP;
/**
* Class Stemmer generates keyword stems.
*
* @since 4.0
*/
final class Stemmer {
/**
* Supported language codes and their correlating class name.
*
* @since 4.0
* @package SearchWP
* @var array
*/
private $supported_language_codes = array(
'en' => 'English',
'da' => 'Danish',
'nl' => 'Dutch',
'fr' => 'French',
'de' => 'German',
'it' => 'Italian',
'nb' => 'Norwegian',
'nn' => 'Norwegian',
'pt' => 'Portuguese',
'ro' => 'Romanian',
'ru' => 'Russian',
'es' => 'Spanish',
'sv' => 'Swedish',
);
/**
* The stemmer for this language code.
*
* @since 4.0
* @package SearchWP
* @var bool|object
*/
private $localized_stemmer = false;
/**
* Constructor.
*
* @since 4.0
*/
public function __construct() {
// Determine which locale we're using.
$site_locale = apply_filters( 'searchwp\stemmer\locale', get_locale() );
$language_code = strtolower( substr( $site_locale, 0, 2 ) );
if ( array_key_exists( $language_code, $this->supported_language_codes ) ) {
$stemmer = '\SearchWP\Dependencies\Wamania\Snowball\\' . $this->supported_language_codes[ $language_code ];
if ( class_exists( $stemmer ) ) {
$this->localized_stemmer = new $stemmer();
}
}
}
/**
* Generates a stem for the submitted word.
*
* @since 4.0
* @param string $word The word to stem.
* @return string The stemmed word.
*/
public function stem( string $word ) {
$custom_stem = apply_filters( 'searchwp\stemmer\custom', false, $word );
if ( $custom_stem ) {
return $custom_stem;
}
if ( false === $this->localized_stemmer ) {
do_action( 'searchwp\debug\log', 'No stemmer found', 'stemmer' );
return $word;
}
return $this->localized_stemmer->stem( $word );
}
/**
* Getter for supported language codes.
*
* @since 4.0
* @return array The language codes.
*/
function get_supported_language_codes() {
return array_keys( $this->supported_language_codes );
}
}