122 lines
3.2 KiB
PHP
122 lines
3.2 KiB
PHP
<?php
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/**
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* Copyright (c) 2014 Vincent Petry <PVince81@owncloud.com>
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*
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*/
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namespace OC;
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class NaturalSort {
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private static $instance;
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private $collator;
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private $cache = array();
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/**
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* Instantiate a new \OC\NaturalSort instance.
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* @param object $injectedCollator
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*/
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public function __construct($injectedCollator = null) {
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// inject an instance of \Collator('en_US') to force using the php5-intl Collator
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// or inject an instance of \OC\NaturalSort_DefaultCollator to force using Owncloud's default collator
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if (isset($injectedCollator)) {
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$this->collator = $injectedCollator;
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\OC_Log::write('core', 'forced use of '.get_class($injectedCollator), \OC_Log::DEBUG);
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}
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}
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/**
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* Split the given string in chunks of numbers and strings
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* @param string $t string
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* @return array of strings and number chunks
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*/
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private function naturalSortChunkify($t) {
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// Adapted and ported to PHP from
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// http://my.opera.com/GreyWyvern/blog/show.dml/1671288
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if (isset($this->cache[$t])) {
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return $this->cache[$t];
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}
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$tz = array();
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$x = 0;
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$y = -1;
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$n = null;
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while (isset($t[$x])) {
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$c = $t[$x];
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// only include the dot in strings
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$m = ((!$n && $c === '.') || ($c >= '0' && $c <= '9'));
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if ($m !== $n) {
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// next chunk
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$y++;
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$tz[$y] = '';
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$n = $m;
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}
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$tz[$y] .= $c;
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$x++;
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}
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$this->cache[$t] = $tz;
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return $tz;
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}
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/**
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* Returns the string collator
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* @return \Collator string collator
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*/
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private function getCollator() {
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if (!isset($this->collator)) {
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// looks like the default is en_US_POSIX which yields wrong sorting with
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// German umlauts, so using en_US instead
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if (class_exists('Collator')) {
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$this->collator = new \Collator('en_US');
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}
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else {
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$this->collator = new \OC\NaturalSort_DefaultCollator();
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}
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}
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return $this->collator;
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}
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/**
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* Compare two strings to provide a natural sort
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* @param string $a first string to compare
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* @param string $b second string to compare
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* @return int -1 if $b comes before $a, 1 if $a comes before $b
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* or 0 if the strings are identical
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*/
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public function compare($a, $b) {
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// Needed because PHP doesn't sort correctly when numbers are enclosed in
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// parenthesis, even with NUMERIC_COLLATION enabled.
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// For example it gave ["test (2).txt", "test.txt"]
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// instead of ["test.txt", "test (2).txt"]
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$aa = self::naturalSortChunkify($a);
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$bb = self::naturalSortChunkify($b);
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for ($x = 0; isset($aa[$x]) && isset($bb[$x]); $x++) {
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$aChunk = $aa[$x];
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$bChunk = $bb[$x];
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if ($aChunk !== $bChunk) {
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// test first character (character comparison, not number comparison)
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if ($aChunk[0] >= '0' && $aChunk[0] <= '9' && $bChunk[0] >= '0' && $bChunk[0] <= '9') {
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$aNum = (int)$aChunk;
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$bNum = (int)$bChunk;
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return $aNum - $bNum;
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}
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return self::getCollator()->compare($aChunk, $bChunk);
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}
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}
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return count($aa) - count($bb);
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}
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/**
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* Returns a singleton
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* @return \OC\NaturalSort instance
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*/
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public static function getInstance() {
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if (!isset(self::$instance)) {
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self::$instance = new \OC\NaturalSort();
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}
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return self::$instance;
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}
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}
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