*
* @package Wiki
*/
define("DIFF_EQUAL", "=");
define("DIFF_ADDED", "+");
define("DIFF_DELETED", "-");
define("DIFF_MOVED", "M");
/**
* Get difference between two strings.
*
* @param string old first string
* @param string new second string
* @param bool show_equals set to true to see line that are equal between
* the two strings (default true)
* @param string format_line_function callback function to format line
* (default 'format_line')
*
* @return string formated diff output
*/
function diff(
$old,
$new,
$show_equals = false,
$format_line_function = 'format_line'
) {
$oldArr = str_split_on_new_line($old);
$newArr = str_split_on_new_line($new);
$oldCount = count($oldArr);
$newCount = count($newArr);
$max = max($oldCount, $newCount);
//get added and deleted lines
$deleted = array_diff_assoc($oldArr, $newArr);
$added = array_diff_assoc($newArr, $oldArr);
$moved = [];
foreach ($added as $key => $candidate) {
foreach ($deleted as $index => $content) {
if ($candidate == $content) {
$moved[$key] = $candidate;
unset($added[$key]);
unset($deleted[$index]);
break;
}
}
}
$output = '';
for ($i = 0; $i < $max; $i++) {
// line changed
if (isset($deleted[$i]) && isset($added[$i])) {
$output .= $format_line_function($i, DIFF_DELETED, $deleted[$i]);
$output .= $format_line_function($i, DIFF_ADDED, $added[$i]);
} elseif (isset($deleted[$i]) && !isset($added[$i])) {
// line deleted
$output .= $format_line_function($i, DIFF_DELETED, $deleted[$i]);
} elseif (isset($added[$i]) && !isset($deleted[$i])) {
// line added
$output .= $format_line_function($i, DIFF_ADDED, $added[$i]);
} elseif (isset($moved[$i])) {
// line moved
$output .= $format_line_function($i, DIFF_MOVED, $newArr[$i]);
} elseif ($show_equals) {
// line unchanged
$output .= $format_line_function($i, DIFF_EQUAL, $newArr[$i]);
}
}
return $output;
}
/**
* Split strings on new line.
*/
function str_split_on_new_line($str)
{
$content = [];
if (api_strpos($str, "\r\n") !== false) {
$content = explode("\r\n", $str);
} elseif (api_strpos($str, "\n") !== false) {
$content = explode("\n", $str);
} elseif (api_strpos($str, "\r") !== false) {
$content = explode("\r", $str);
} else {
$content[] = $str;
}
return $content;
}
/**
* Default and prototype format line function.
*
* @param int line line number
* @param mixed type line type, must be one of the following :
* DIFF_EQUAL, DIFF_MOVED, DIFF_ADDED, DIFF_DELETED
* @param string value line content
* @param bool skip_empty skip empty lines (default false)
*
* @return string formated diff line
*/
function format_line($line, $type, $value, $skip_empty = false)
{
if (trim($value) == "" && $skip_empty) {
return "";
} elseif (trim($value) == "") {
$value = ' ';
}
switch ($type) {
case DIFF_EQUAL:
// return $line. ' : ' . ' = ' . $value . '
' . "\n" ;
return ''.$value.'
'."\n"; //juan carlos muestra solo color
break;
case DIFF_MOVED:
//return $line. ' : ' . ' M ' . $value . '
' . "\n" ; //juan carlos ra�a la sustitye la inverior
return ''.$value.'
'."\n"; //juan carlos muestra solo color
break;
case DIFF_ADDED:
//return $line . ' : ' . ' + ' . $value . '
' . "\n" ;
return ''.$value.'
'."\n"; //juan carlos muestra solo color
break;
case DIFF_DELETED:
//return $line . ' : ' . ' - ' . $value . '
' . "\n" ; //juan carlos ra�a la sustitye la inverior
return ''.$value.'
'."\n"; //juan carlos muestra solo color
break;
}
}
/**
* Table format line function.
*
* @see format_line
*/
function format_table_line($line, $type, $value, $skip_empty = false)
{
if (trim($value) == "" && $skip_empty) {
return "";
} elseif (trim($value) == "") {
$value = ' ';
}
switch ($type) {
case DIFF_EQUAL:
return '