From 12de05107e4c8b006bde6ee8916f34eb476d08da Mon Sep 17 00:00:00 2001
From: donncha <donncha@7be80a69-a1ef-0310-a953-fb0f7c49ff36>
Date: Fri, 13 Jun 2008 17:21:00 +0000
Subject: WP Merge with revision 8075

git-svn-id: http://svn.automattic.com/wordpress-mu/trunk@1328 7be80a69-a1ef-0310-a953-fb0f7c49ff36
---
 wp-includes/Text/Diff/Engine/xdiff.php | 63 ++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 wp-includes/Text/Diff/Engine/xdiff.php

(limited to 'wp-includes/Text/Diff/Engine/xdiff.php')

diff --git a/wp-includes/Text/Diff/Engine/xdiff.php b/wp-includes/Text/Diff/Engine/xdiff.php
new file mode 100644
index 0000000..a39a4be
--- /dev/null
+++ b/wp-includes/Text/Diff/Engine/xdiff.php
@@ -0,0 +1,63 @@
+<?php
+/**
+ * Class used internally by Diff to actually compute the diffs.
+ *
+ * This class uses the xdiff PECL package (http://pecl.php.net/package/xdiff)
+ * to compute the differences between the two input arrays.
+ *
+ * $Horde: framework/Text_Diff/Diff/Engine/xdiff.php,v 1.6 2008/01/04 10:07:50 jan Exp $
+ *
+ * Copyright 2004-2008 The Horde Project (http://www.horde.org/)
+ *
+ * See the enclosed file COPYING for license information (LGPL). If you did
+ * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
+ *
+ * @author  Jon Parise <jon@horde.org>
+ * @package Text_Diff
+ */
+class Text_Diff_Engine_xdiff {
+
+    /**
+     */
+    function diff($from_lines, $to_lines)
+    {
+        array_walk($from_lines, array('Text_Diff', 'trimNewlines'));
+        array_walk($to_lines, array('Text_Diff', 'trimNewlines'));
+
+        /* Convert the two input arrays into strings for xdiff processing. */
+        $from_string = implode("\n", $from_lines);
+        $to_string = implode("\n", $to_lines);
+
+        /* Diff the two strings and convert the result to an array. */
+        $diff = xdiff_string_diff($from_string, $to_string, count($to_lines));
+        $diff = explode("\n", $diff);
+
+        /* Walk through the diff one line at a time.  We build the $edits
+         * array of diff operations by reading the first character of the
+         * xdiff output (which is in the "unified diff" format).
+         *
+         * Note that we don't have enough information to detect "changed"
+         * lines using this approach, so we can't add Text_Diff_Op_changed
+         * instances to the $edits array.  The result is still perfectly
+         * valid, albeit a little less descriptive and efficient. */
+        $edits = array();
+        foreach ($diff as $line) {
+            switch ($line[0]) {
+            case ' ':
+                $edits[] = &new Text_Diff_Op_copy(array(substr($line, 1)));
+                break;
+
+            case '+':
+                $edits[] = &new Text_Diff_Op_add(array(substr($line, 1)));
+                break;
+
+            case '-':
+                $edits[] = &new Text_Diff_Op_delete(array(substr($line, 1)));
+                break;
+            }
+        }
+
+        return $edits;
+    }
+
+}
-- 
cgit