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razusrest
162
old/wp-includes/Text/Diff/Engine/shell.php
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162
old/wp-includes/Text/Diff/Engine/shell.php
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<?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 Unix `diff` program via shell_exec to compute the
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* differences between the two input arrays.
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*
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* Copyright 2007-2010 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 https://opensource.org/license/lgpl-2-1/.
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*
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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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*/
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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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*
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* @var string
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*/
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var $_diffCommand = 'diff';
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/**
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* Returns the array of differences.
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*
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* @param array $from_lines lines of text from old file
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* @param array $to_lines lines of text from new file
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*
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* @return array all changes made (array with Text_Diff_Op_* objects)
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*/
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function diff($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($to_lines, array('Text_Diff', 'trimNewlines'));
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$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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*
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* @access private
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*
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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 $end Optional end line, when we want to chop more
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* than one line.
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*
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* @return array The chopped lines
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*/
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function _getLines(&$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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