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<?php
/**
* Copyright (c) 2014 Vincent Petry <PVince81@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*
*/
namespace OC;
class NaturalSort {
private static $instance;
private $collator;
private $cache = array();
/**
* Split the given string in chunks of numbers and strings
* @param string $t string
* @return array of strings and number chunks
*/
private function naturalSortChunkify($t) {
// Adapted and ported to PHP from
// http://my.opera.com/GreyWyvern/blog/show.dml/1671288
if (isset($this->cache[$t])) {
return $this->cache[$t];
}
$tz = array();
$x = 0;
$y = -1;
$n = null;
while (isset($t[$x])) {
$c = $t[$x];
// only include the dot in strings
$m = ((!$n && $c === '.') || ($c >= '0' && $c <= '9'));
if ($m !== $n) {
// next chunk
$y++;
$tz[$y] = '';
$n = $m;
}
$tz[$y] .= $c;
$x++;
}
$this->cache[$t] = $tz;
return $tz;
}
/**
* Returns the string collator
* @return \Collator string collator
*/
private function getCollator() {
if (!isset($this->collator)) {
// looks like the default is en_US_POSIX which yields wrong sorting with
// German umlauts, so using en_US instead
if (class_exists('Collator')) {
$this->collator = new \Collator('en_US');
}
else {
$this->collator = new \OC\NaturalSort_DefaultCollator();
}
}
return $this->collator;
}
/**
* Compare two strings to provide a natural sort
* @param string $a first string to compare
* @param string $b second string to compare
* @return int -1 if $b comes before $a, 1 if $a comes before $b
* or 0 if the strings are identical
*/
public function compare($a, $b) {
// Needed because PHP doesn't sort correctly when numbers are enclosed in
// parenthesis, even with NUMERIC_COLLATION enabled.
// For example it gave ["test (2).txt", "test.txt"]
// instead of ["test.txt", "test (2).txt"]
$aa = self::naturalSortChunkify($a);
$bb = self::naturalSortChunkify($b);
for ($x = 0; isset($aa[$x]) && isset($bb[$x]); $x++) {
$aChunk = $aa[$x];
$bChunk = $bb[$x];
if ($aChunk !== $bChunk) {
// test first character (character comparison, not number comparison)
if ($aChunk[0] >= '0' && $aChunk[0] <= '9' && $bChunk[0] >= '0' && $bChunk[0] <= '9') {
$aNum = (int)$aChunk;
$bNum = (int)$bChunk;
return $aNum - $bNum;
}
return self::getCollator()->compare($aChunk, $bChunk);
}
}
return count($aa) - count($bb);
}
/**
* Returns a singleton
* @return \OC\NaturalSort instance
*/
public static function getInstance() {
if (!isset(self::$instance)) {
self::$instance = new \OC\NaturalSort();
}
return self::$instance;
}
}
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