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<?php
/**
* This file is part of LimeSurvey
* Offer some helper for sorting
* @since 6.3.7
*/
namespace LimeSurvey\Helpers;
use Yii;
// Can not use Collator class, must work without
class SortHelper
{
/** @var integer flag for regular sort */
const SORT_REGULAR = 0;
/** @var integer flag for numeric sort */
const SORT_NUMERIC = 1;
/** @var integer flag for string sort */
const SORT_STRING = 2;
/**
* @var self Singleton
*/
private static $instance = null;
/**
* @var string current language
*/
private static $language = null;
/**
* @var \Collator if possible
*/
private static $collator = null;
/**
* Set the language when construct
*/
private function __construct($language)
{
self::$language = $language;
if (class_exists('Collator')) {
$locale = $language;
$languageData = getLanguageData();
if (isset($languageData[$language]['cldr'])) {
$locale = $languageData[$language]['cldr'];
}
self::$collator = new \Collator($locale);
} else {
Yii::log(
"For better alphabetical ordering : you need php-intl.",
'warning',
'application.helpers.sorthelper.construct'
);
}
}
public static function getInstance($language)
{
if (empty(self::$instance) || $language === self::$language) {
self::$instance = new self($language);
}
return self::$instance;
}
/**
* Sort array maintaining index association
* @see asort and Collator::asort
* @param string[] $array to sort
* @param integer $flags in self::SORT_REGULAR (default or invalid), self::SORT_NUMERIC, self::SORT_STRING
* @return boolean, see Collator::asort
*/
public function asort(array &$array, int $flags = self::SORT_REGULAR): bool
{
if (is_null(self::$collator)) {
return asort($array, self::getFlag($flags));
}
return self::$collator->asort($array, self::getFlag($flags));
}
/**
* Sort array maintaining index association in reverse order
* @param string[] $array to sort
* @param integer $flags in self::SORT_REGULAR (default or invalid), self::SORT_NUMERIC, self::SORT_STRING
* @return boolean, see Collator::asort
* @see arsort and Collator::asort
*/
public function arsort(array &$array, int $flags = self::SORT_REGULAR): bool
{
if (is_null(self::$collator)) {
return arsort($array, self::getFlag($flags));
}
// Use our own asort method and then reverse the array
$result = $this->asort($array, $flags);
if ($result) {
$array = array_reverse($array, true); // true preserves keys
}
return $result;
}
/**
* Return flag tupe depend on functoion sed
* @param integer
* @return integer
*/
private static function getFlag($type)
{
if (is_null(self::$collator)) {
switch ($type) {
case self::SORT_STRING:
return SORT_STRING;
case self::SORT_NUMERIC:
return SORT_NUMERIC;
case self::SORT_REGULAR:
default:
return SORT_REGULAR;
}
}
switch ($type) {
case self::SORT_STRING:
return \Collator::SORT_STRING;
case self::SORT_NUMERIC:
return \Collator::SORT_NUMERIC;
case self::SORT_REGULAR:
default:
return \Collator::SORT_REGULAR;
}
}
}