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64 lines
2.2 KiB
64 lines
2.2 KiB
<?php |
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/** |
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* Class used internally by Diff to actually compute the diffs. |
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* |
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* This class uses the xdiff PECL package (http://pecl.php.net/package/xdiff) |
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* to compute the differences between the two input arrays. |
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* |
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* Copyright 2004-2010 The Horde Project (http://www.horde.org/) |
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* |
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* See the enclosed file COPYING for license information (LGPL). If you did |
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* not receive this file, see http://opensource.org/licenses/lgpl-license.php. |
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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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class Text_Diff_Engine_xdiff { |
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/** |
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*/ |
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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 $line) { |
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if (!strlen($line)) { |
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continue; |
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} |
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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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}
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