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<?php
declare(strict_types=1);
namespace voku\helper;
/**
* Phonetic-Helper-Class
*
* @package voku\helper
*/
final class StopWords
{
/**
* @var array
*/
private static $availableLanguages = array(
'ar',
'bg',
'ca',
'cz',
'da',
'de',
'el',
'en',
'eo',
'es',
'et',
'fi',
'fr',
'hi',
'hr',
'hu',
'id',
'it',
'ka',
'lt',
'lv',
'nl',
'no',
'pl',
'pt',
'ro',
'ru',
'sk',
'sv',
'tr',
'uk',
'vi'
);
/**
* @var array
*/
private $stopWords = array();
/**
* Load language-data from one language.
*
* @param string $language
*
* @throws StopWordsLanguageNotExists
*/
private function loadLanguageData(string $language = 'de')
{
if (\in_array($language, self::$availableLanguages, true) === false) {
throw new StopWordsLanguageNotExists('language not supported: ' . $language);
}
$this->stopWords[$language] = $this->getData($language);
}
/**
* Get data from "/data/*.php".
*
* @param string $file
*
* @return array <p>Will return an empty array on error.</p>
*/
private function getData(string $file): array
{
static $RESULT_STOP_WORDS_CACHE = array();
if (isset($RESULT_STOP_WORDS_CACHE[$file])) {
return $RESULT_STOP_WORDS_CACHE[$file];
}
$file = __DIR__ . '/stopwords/' . $file . '.php';
if (file_exists($file)) {
/** @noinspection PhpIncludeInspection */
$RESULT_STOP_WORDS_CACHE[$file] = require $file;
} else {
$RESULT_STOP_WORDS_CACHE[$file] = array();
}
return $RESULT_STOP_WORDS_CACHE[$file];
}
/**
* Get the stop-words from one language.
*
* @param string $language
*
* @return array
*
* @throws StopWordsLanguageNotExists
*/
public function getStopWordsFromLanguage(string $language = 'de'): array
{
if (\in_array($language, self::$availableLanguages, true) === false) {
throw new StopWordsLanguageNotExists('language not supported: ' . $language);
}
if (!isset($this->stopWords[$language])) {
$this->loadLanguageData($language);
}
return $this->stopWords[$language];
}
private function loadLanguageDataAll()
{
foreach (self::$availableLanguages as $language) {
if (!isset($this->stopWords[$language])) {
$this->loadLanguageData($language);
}
}
}
/**
* Get all stop-words from all languages.
*
* @return array
*
* @throws StopWordsLanguageNotExists
*/
public function getStopWordsAll(): array
{
$this->loadLanguageDataAll();
return $this->stopWords;
}
}
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