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Viewing file:     shell.php (5.05 KB)      -rw-rw-rw-

 * @package Text_Diff
 * @since   0.3.0
 */
class Text_Diff_Engine_shell {

    /**
     * Path to the diff executable
     *
     * @var string
     */
    var $_diffCommand = 'diff';

    /**
     * Returns the array of differences.
     *
     * @param array $from_lines lines of text from old file
     * @param array $to_lines   lines of text from new file
     *
     * @return array all changes made (array with Text_Diff_Op_* objects)
     */
    function diff($from_lines, $to_lines)
    {
        array_walk($from_lines, array('Text_Diff', 'trimNewlines'));
        array_walk($to_lines, array('Text_Diff', 'trimNewlines'));

        $temp_dir = Text_Diff::_getTempDir();

        // Execute gnu diff or similar to get a standard diff file.
        $from_file = tempnam($temp_dir, 'Text_Diff');
        $to_file = tempnam($temp_dir, 'Text_Diff');
        $fp = fopen($from_file, 'w');
        fwrite($fp, implode("\n", $from_lines));
        fclose($fp);
        $fp = fopen($to_file, 'w');
        fwrite($fp, implode("\n", $to_lines));
        fclose($fp);
        $diff = shell_exec($this->_diffCommand . ' ' . $from_file . ' ' . $to_file);
        unlink($from_file);
        unlink($to_file);

        if (is_null($diff)) {
            // No changes were made
            return array(new Text_Diff_Op_copy($from_lines));
        }

        $from_line_no = 1;
        $to_line_no = 1;
        $edits = array();

        // Get changed lines by parsing something like:
        // 0a1,2
        // 1,2c4,6
        // 1,5d6
        preg_match_all('#^(\d+)(?:,(\d+))?([adc])(\d+)(?:,(\d+))?$#m', $diff,
            $matches, PREG_SET_ORDER);

        foreach ($matches as $match) {
            if (!isset($match[5])) {
                // This paren is not set every time (see regex).
                $match[5] = false;
            }

            if ($match[3] == 'a') {
                $from_line_no--;
            }

            if ($match[3] == 'd') {
                $to_line_no--;
            }

            if ($from_line_no < $match[1] 
bool(false)