includes/diffengine/Engine/xdiff.php
author Dan Fuhry <dan@enanocms.org>
Sat, 29 Jan 2011 15:31:15 -0500
changeset 1337 2ac4e08641fc
parent 1227 bdac73ed481e
permissions -rw-r--r--
Fixed some variable issues in emailer
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<?php
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/**
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 * Class used internally by Diff to actually compute the diffs.  This class
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 * uses the xdiff PECL package (http://pecl.php.net/package/xdiff) to compute
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 * the differences between the two input arrays.
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 *
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 * @author  Jon Parise <jon@horde.org>
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 * @package Text_Diff
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 *
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 * @access private
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 */
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class Text_Diff_Engine_xdiff {
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		function diff($from_lines, $to_lines)
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		{
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				array_walk($from_lines, array('Text_Diff', 'trimNewlines'));
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				array_walk($to_lines, array('Text_Diff', 'trimNewlines'));
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				/* Convert the two input arrays into strings for xdiff processing. */
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				$from_string = implode("\n", $from_lines);
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				$to_string = implode("\n", $to_lines);
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				/* Diff the two strings and convert the result to an array. */
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				$diff = xdiff_string_diff($from_string, $to_string, count($to_lines));
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				$diff = explode("\n", $diff);
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				/* Walk through the diff one line at a time.  We build the $edits
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 				* array of diff operations by reading the first character of the
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 				* xdiff output (which is in the "unified diff" format).
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 				*
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 				* Note that we don't have enough information to detect "changed"
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 				* lines using this approach, so we can't add Text_Diff_Op_changed
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 				* instances to the $edits array.  The result is still perfectly
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 				* valid, albeit a little less descriptive and efficient. */
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				$edits = array();
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				foreach ($diff as $line) {
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						switch ($line[0]) {
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						case ' ':
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								$edits[] = &new Text_Diff_Op_copy(array(substr($line, 1)));
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								break;
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						case '+':
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								$edits[] = &new Text_Diff_Op_add(array(substr($line, 1)));
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								break;
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						case '-':
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								$edits[] = &new Text_Diff_Op_delete(array(substr($line, 1)));
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								break;
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						}
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				}
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				return $edits;
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		}
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}