Edit File by line

<?php

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/**

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* Class used internally by Diff to actually compute the diffs.

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* This class uses the Unix `diff` program via shell_exec to compute the

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* differences between the two input arrays.

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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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* @author Milian Wolff <mail@milianw.de>

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* @package Text_Diff

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* @since 0.3.0

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class Text_Diff_Engine_shell {

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/**

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* Path to the diff executable

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* @var string

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var $_diffCommand = 'diff';

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/**

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* Returns the array of differences.

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* @param array $from_lines lines of text from old file

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* @param array $to_lines lines of text from new file

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* @return array all changes made (array with Text_Diff_Op_* objects)

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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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$temp_dir = Text_Diff::_getTempDir();

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// Execute gnu diff or similar to get a standard diff file.

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$from_file = tempnam($temp_dir, 'Text_Diff');

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$to_file = tempnam($temp_dir, 'Text_Diff');

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$fp = fopen($from_file, 'w');

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fwrite($fp, implode("\n", $from_lines));

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fclose($fp);

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$fp = fopen($to_file, 'w');

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fwrite($fp, implode("\n", $to_lines));

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fclose($fp);

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$diff = shell_exec($this->_diffCommand . ' ' . $from_file . ' ' . $to_file);

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unlink($from_file);

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unlink($to_file);

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if (is_null($diff)) {

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// No changes were made

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return array(new Text_Diff_Op_copy($from_lines));

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}

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$from_line_no = 1;

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$to_line_no = 1;

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$edits = array();

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// Get changed lines by parsing something like:

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// 0a1,2

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// 1,2c4,6

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// 1,5d6

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preg_match_all('#^(\d+)(?:,(\d+))?([adc])(\d+)(?:,(\d+))?$#m', $diff,

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$matches, PREG_SET_ORDER);

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foreach ($matches as $match) {

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if (!isset($match[5])) {

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// This paren is not set every time (see regex).

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$match[5] = false;

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}

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if ($match[3] == 'a') {

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$from_line_no--;

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}

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if ($match[3] == 'd') {

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$to_line_no--;

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}

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if ($from_line_no < $match[1] || $to_line_no < $match[4]) {

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// copied lines

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assert($match[1] - $from_line_no == $match[4] - $to_line_no);

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array_push($edits,

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new Text_Diff_Op_copy(

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$this->_getLines($from_lines, $from_line_no, $match[1] - 1),

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$this->_getLines($to_lines, $to_line_no, $match[4] - 1)));

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}

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switch ($match[3]) {

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case 'd':

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// deleted lines

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array_push($edits,

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new Text_Diff_Op_delete(

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$this->_getLines($from_lines, $from_line_no, $match[2])));

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$to_line_no++;

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break;

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case 'c':

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// changed lines

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array_push($edits,

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new Text_Diff_Op_change(

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$this->_getLines($from_lines, $from_line_no, $match[2]),

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$this->_getLines($to_lines, $to_line_no, $match[5])));

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break;

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case 'a':

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// added lines

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array_push($edits,

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new Text_Diff_Op_add(

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$this->_getLines($to_lines, $to_line_no, $match[5])));

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$from_line_no++;

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break;

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}

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}

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if (!empty($from_lines)) {

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// Some lines might still be pending. Add them as copied

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array_push($edits,

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new Text_Diff_Op_copy(

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$this->_getLines($from_lines, $from_line_no,

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$from_line_no + count($from_lines) - 1),

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$this->_getLines($to_lines, $to_line_no,

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$to_line_no + count($to_lines) - 1)));

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}

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return $edits;

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}

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/**

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* Get lines from either the old or new text

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* @access private

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* @param array $text_lines Either $from_lines or $to_lines (passed by reference).

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* @param int $line_no Current line number (passed by reference).

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* @param int $end Optional end line, when we want to chop more

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* than one line.

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* @return array The chopped lines

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function _getLines(&$text_lines, &$line_no, $end = false)

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{

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if (!empty($end)) {

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$lines = array();

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// We can shift even more

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while ($line_no <= $end) {

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array_push($lines, array_shift($text_lines));

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$line_no++;

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}

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} else {

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$lines = array(array_shift($text_lines));

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$line_no++;

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}

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return $lines;

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}

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}

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