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<?php
/**
 * Class used internally by Diff to actually compute the diffs.
 *
 * This class uses the Unix `diff` program via shell_exec to compute the
 * differences between the two input arrays.
 *
 * $Horde: framework/Text_Diff/Diff/Engine/shell.php,v 1.6.2.4 2009/01/06 15:23:41 jan Exp $
 *
 * Copyright 2007-2009 The Horde Project (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you did
 * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
 *
 * @author  Milian Wolff <mail@milianw.de>
 * @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($fpimplode("\n"$from_lines));
        
fclose($fp);
        
$fp fopen($to_file'w');
        
fwrite($fpimplode("\n"$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,
            
$matchesPREG_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] || $to_line_no $match[4]) {
                
// copied lines
                
assert('$match[1] - $from_line_no == $match[4] - $to_line_no');
                
array_push($edits,
                    new 
Text_Diff_Op_copy(
                        
$this->_getLines($from_lines$from_line_no$match[1] - 1),
                        
$this->_getLines($to_lines$to_line_no$match[4] - 1)));
            }

            switch (
$match[3]) {
            case 
'd':
                
// deleted lines
                
array_push($edits,
                    new 
Text_Diff_Op_delete(
                        
$this->_getLines($from_lines$from_line_no$match[2])));
                
$to_line_no++;
                break;

            case 
'c':
                
// changed lines
                
array_push($edits,
                    new 
Text_Diff_Op_change(
                        
$this->_getLines($from_lines$from_line_no$match[2]),
                        
$this->_getLines($to_lines$to_line_no$match[5])));
                break;

            case 
'a':
                
// added lines
                
array_push($edits,
                    new 
Text_Diff_Op_add(
                        
$this->_getLines($to_lines$to_line_no$match[5])));
                
$from_line_no++;
                break;
            }
        }

        if (!empty(
$from_lines)) {
            
// Some lines might still be pending. Add them as copied
            
array_push($edits,
                new 
Text_Diff_Op_copy(
                    
$this->_getLines($from_lines$from_line_no,
                                     
$from_line_no count($from_lines) - 1),
                    
$this->_getLines($to_lines$to_line_no,
                                     
$to_line_no count($to_lines) - 1)));
        }

        return 
$edits;
    }

    
/**
     * Get lines from either the old or new text
     *
     * @access private
     *
     * @param array &$text_lines Either $from_lines or $to_lines
     * @param int   &$line_no    Current line number
     * @param int   $end         Optional end line, when we want to chop more
     *                           than one line.
     *
     * @return array The chopped lines
     */
    
function _getLines(&$text_lines, &$line_no$end false)
    {
        if (!empty(
$end)) {
            
$lines = array();
            
// We can shift even more
            
while ($line_no <= $end) {
                
array_push($linesarray_shift($text_lines));
                
$line_no++;
            }
        } else {
            
$lines = array(array_shift($text_lines));
            
$line_no++;
        }

        return 
$lines;
    }

}

:: Command execute ::

Enter:
 
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:: Search ::
  - regexp 

:: Upload ::
 
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:: Make Dir ::
 
[ ok ]
:: Make File ::
 
[ ok ]

:: Go Dir ::
 
:: Go File ::
 

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