From 173059f6d00faa06dab9188efb2d7536f15861e4 Mon Sep 17 00:00:00 2001
From: Vincent Petry <pvince81@owncloud.com>
Date: Tue, 18 Feb 2014 12:29:05 +0100
Subject: Fixed file list sorting

Now using a natural sort algorithm that is more consistent between JS
and PHP (although not perfect in some corner cases)

- added OC.Util.naturalSortComparator that uses the same algo that was
  used for the user list
- changed user list and files list to use OC.Util.naturalSortComparator
- removed toLowerCase() and changed the comparator to use
  String.localeCompare()
- added unit tests
- added OC_NaturalSort that is used by OCP\Util::naturalSortCompare()
---
 lib/private/naturalsort.php | 116 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 lib/private/naturalsort.php

(limited to 'lib/private/naturalsort.php')

diff --git a/lib/private/naturalsort.php b/lib/private/naturalsort.php
new file mode 100644
index 00000000000..b6fa0ed8968
--- /dev/null
+++ b/lib/private/naturalsort.php
@@ -0,0 +1,116 @@
+<?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_DefaultCollator {
+
+	public function compare($a, $b) {
+		if ($a === $b) {
+			return 0;
+		}
+		return ($a < $b) ? -1 : 1;
+	}
+}
+
+class NaturalSort {
+	private static $instance;
+	private $collator;
+
+	/**
+	 * 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
+		$tz = array();
+		$x = 0;
+		$y = -1;
+		$n = null;
+		$length = strlen($t);
+
+		while ($x < $length) {
+			$c = $t[$x];
+			$m = ($c === '.' || ($c >= '0' && $c <= '9'));
+			if ($m !== $n) {
+				// next chunk
+				$y++;
+				$tz[$y] = '';
+				$n = $m;
+			}
+			$tz[$y] .= $c;
+			$x++;
+		}
+		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 $a first string to compare
+	 * @param $b second string to compare
+	 * @return -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);
+		$alen = count($aa);
+		$blen = count($bb);
+
+		for ($x = 0; $x < $alen && $x < $blen; $x++) {
+			$aChunk = $aa[$x];
+			$bChunk = $bb[$x];
+			if ($aChunk !== $bChunk) {
+				if (is_numeric($aChunk) && is_numeric($bChunk)) {
+					$aNum = (int)$aChunk;
+					$bNum = (int)$bChunk;
+					return $aNum - $bNum;
+				}
+				return self::getCollator()->compare($aChunk, $bChunk);
+			}
+		}
+		return $alen - $blen;
+	}
+
+	/**
+	 * Returns a singleton
+	 * @return \OC\NaturalSort instance
+	 */
+	public static function getInstance() {
+		if (!isset(self::$instance)) {
+			self::$instance = new \OC\NaturalSort();
+		}
+		return self::$instance;
+	}
+}
+
-- 
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