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Diffstat (limited to 'wp-includes/Text/Diff/Engine/xdiff.php')
-rw-r--r-- | wp-includes/Text/Diff/Engine/xdiff.php | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/wp-includes/Text/Diff/Engine/xdiff.php b/wp-includes/Text/Diff/Engine/xdiff.php new file mode 100644 index 0000000..d09307d --- /dev/null +++ b/wp-includes/Text/Diff/Engine/xdiff.php @@ -0,0 +1,64 @@ +<?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 https://opensource.org/license/lgpl-2-1/. + * + * @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; + } + +} |