/usr/share/php/Horde/Text/Diff.php is in php-horde-text-diff 2.2.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* General API for generating and formatting diffs - the differences between
* two sequences of strings.
*
* The original PHP version of this code was written by Geoffrey T. Dairiki
* <dairiki@dairiki.org>, and is used/adapted with his permission.
*
* Copyright 2004 Geoffrey T. Dairiki <dairiki@dairiki.org>
* Copyright 2004-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file COPYING for license information (LGPL). If you did
* not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @package Text_Diff
* @author Geoffrey T. Dairiki <dairiki@dairiki.org>
*/
class Horde_Text_Diff
{
/**
* Array of changes.
*
* @var array
*/
protected $_edits;
/**
* Computes diffs between sequences of strings.
*
* @param string $engine Name of the diffing engine to use. 'auto'
* will automatically select the best.
* @param array $params Parameters to pass to the diffing engine.
* Normally an array of two arrays, each
* containing the lines from a file.
*/
public function __construct($engine, $params)
{
if ($engine == 'auto') {
$engine = extension_loaded('xdiff') ? 'Xdiff' : 'Native';
} else {
$engine = Horde_String::ucfirst(basename($engine));
}
$class = 'Horde_Text_Diff_Engine_' . $engine;
$diff_engine = new $class();
$this->_edits = call_user_func_array(array($diff_engine, 'diff'), $params);
}
/**
* Returns the array of differences.
*/
public function getDiff()
{
return $this->_edits;
}
/**
* returns the number of new (added) lines in a given diff.
*
* @return integer The number of new lines
*/
public function countAddedLines()
{
$count = 0;
foreach ($this->_edits as $edit) {
if ($edit instanceof Horde_Text_Diff_Op_Add ||
$edit instanceof Horde_Text_Diff_Op_Change) {
$count += $edit->nfinal();
}
}
return $count;
}
/**
* Returns the number of deleted (removed) lines in a given diff.
*
* @return integer The number of deleted lines
*/
public function countDeletedLines()
{
$count = 0;
foreach ($this->_edits as $edit) {
if ($edit instanceof Horde_Text_Diff_Op_Delete ||
$edit instanceof Horde_Text_Diff_Op_Change) {
$count += $edit->norig();
}
}
return $count;
}
/**
* Computes a reversed diff.
*
* Example:
* <code>
* $diff = new Horde_Text_Diff($lines1, $lines2);
* $rev = $diff->reverse();
* </code>
*
* @return Horde_Text_Diff A Diff object representing the inverse of the
* original diff. Note that we purposely don't return a
* reference here, since this essentially is a clone()
* method.
*/
public function reverse()
{
if (version_compare(zend_version(), '2', '>')) {
$rev = clone($this);
} else {
$rev = $this;
}
$rev->_edits = array();
foreach ($this->_edits as $edit) {
$rev->_edits[] = $edit->reverse();
}
return $rev;
}
/**
* Checks for an empty diff.
*
* @return boolean True if two sequences were identical.
*/
public function isEmpty()
{
foreach ($this->_edits as $edit) {
if (!($edit instanceof Horde_Text_Diff_Op_Copy)) {
return false;
}
}
return true;
}
/**
* Computes the length of the Longest Common Subsequence (LCS).
*
* This is mostly for diagnostic purposes.
*
* @return integer The length of the LCS.
*/
public function lcs()
{
$lcs = 0;
foreach ($this->_edits as $edit) {
if ($edit instanceof Horde_Text_Diff_Op_Copy) {
$lcs += count($edit->orig);
}
}
return $lcs;
}
/**
* Gets the original set of lines.
*
* This reconstructs the $from_lines parameter passed to the constructor.
*
* @return array The original sequence of strings.
*/
public function getOriginal()
{
$lines = array();
foreach ($this->_edits as $edit) {
if ($edit->orig) {
array_splice($lines, count($lines), 0, $edit->orig);
}
}
return $lines;
}
/**
* Gets the final set of lines.
*
* This reconstructs the $to_lines parameter passed to the constructor.
*
* @return array The sequence of strings.
*/
public function getFinal()
{
$lines = array();
foreach ($this->_edits as $edit) {
if ($edit->final) {
array_splice($lines, count($lines), 0, $edit->final);
}
}
return $lines;
}
/**
* Removes trailing newlines from a line of text. This is meant to be used
* with array_walk().
*
* @param string $line The line to trim.
* @param integer $key The index of the line in the array. Not used.
*/
public static function trimNewlines(&$line, $key)
{
$line = str_replace(array("\n", "\r"), '', $line);
}
/**
* Checks a diff for validity.
*
* This is here only for debugging purposes.
*/
protected function _check($from_lines, $to_lines)
{
if (serialize($from_lines) != serialize($this->getOriginal())) {
trigger_error("Reconstructed original doesn't match", E_USER_ERROR);
}
if (serialize($to_lines) != serialize($this->getFinal())) {
trigger_error("Reconstructed final doesn't match", E_USER_ERROR);
}
$rev = $this->reverse();
if (serialize($to_lines) != serialize($rev->getOriginal())) {
trigger_error("Reversed original doesn't match", E_USER_ERROR);
}
if (serialize($from_lines) != serialize($rev->getFinal())) {
trigger_error("Reversed final doesn't match", E_USER_ERROR);
}
$prevtype = null;
foreach ($this->_edits as $edit) {
if ($prevtype == get_class($edit)) {
trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
}
$prevtype = get_class($edit);
}
return true;
}
}
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