65 lines
2.2 KiB
PHP
Executable File
65 lines
2.2 KiB
PHP
Executable File
<?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 2004-2010 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 $line) {
|
|
if (!strlen($line)) {
|
|
continue;
|
|
}
|
|
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;
|
|
}
|
|
|
|
}
|