Text_Diff_Engine_string::parseUnifiedDiff

    function parseUnifiedDiff($diff)
    {
        $edits = array();
        $end = count($diff) - 1;
        for ($i = 0; $i < $end;) {
            $diff1 = array();
            switch (substr($diff[$i], 0, 1)) {
            case ' ':
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == ' ');
                $edits[] = new Text_Diff_Op_copy($diff1);
                break;

            case '+':
                // get all new lines
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == '+');
                $edits[] = new Text_Diff_Op_add($diff1);
                break;

            case '-':
                // get changed or removed lines
                $diff2 = array();
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == '-');

                while ($i < $end && substr($diff[$i], 0, 1) == '+') {
                    $diff2[] = substr($diff[$i++], 1);
                }
                if (count($diff2) == 0) {
                    $edits[] = new Text_Diff_Op_delete($diff1);
                } else {
                    $edits[] = new Text_Diff_Op_change($diff1, $diff2);
                }
                break;

            default:
                $i++;
                break;
            }
        }

        return $edits;
    }