inital commit

webroot/forum/inc/3rdparty/diff/Diff/Engine/Xdiff.php

@@ -0,0 +1,74 @@
+<?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.
+ *
+ * Copyright 2004-2017 Horde LLC (http://www.horde.org/)
+ *
+ * See the enclosed file COPYING for license information (LGPL). If you did
+ * not receive this file, see http://www.horde.org/licenses/lgpl21.
+ *
+ * @author  Jon Parise <jon@horde.org>
+ * @package Text_Diff
+ */
+
+// Disallow direct access to this file for security reasons
+if(!defined("IN_MYBB"))
+{
+	die("Direct initialization of this file is not allowed.<br /><br />Please make sure IN_MYBB is defined.");
+}
+
+class Horde_Text_Diff_Engine_Xdiff
+{
+    /**
+     */
+    public function diff($from_lines, $to_lines)
+    {
+        if (!extension_loaded('xdiff')) {
+            throw new Horde_Text_Diff_Exception('The xdiff extension is required for this diff engine');
+        }
+
+        array_walk($from_lines, array('Horde_Text_Diff', 'trimNewlines'));
+        array_walk($to_lines, array('Horde_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 Horde_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 $line) {
+            if (!strlen($line)) {
+                continue;
+            }
+            switch ($line[0]) {
+            case ' ':
+                $edits[] = new Horde_Text_Diff_Op_Copy(array(substr($line, 1)));
+                break;
+
+            case '+':
+                $edits[] = new Horde_Text_Diff_Op_Add(array(substr($line, 1)));
+                break;
+
+            case '-':
+                $edits[] = new Horde_Text_Diff_Op_Delete(array(substr($line, 1)));
+                break;
+            }
+        }
+
+        return $edits;
+    }
+}