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<?php
/**
* The xPDORevisionControl class provides utilities for content versioning.
*
* @package xpdo
* @subpackage revision
*/
/**
* Utility class for creating, merging, and managing diffs for versioning.
*
* BASED ON:
* Implementation of a GNU diff alike function from scratch.
* Copyright (C) 2003 Nils Knappmeier <nk@knappi.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* @package xpdo
* @subpackage revision
*
*/
class xPDORevisionControl {
/**
* Computes the difference between two string linewise.
* The output is the same format
* as the GNU diff command without any parameters.
* Note: Since GNU diff starts counting with 1, and arrays start counting with
* 0, you have to subtract one from each line number to get the real one.
*/
function diff($text1, $text2) {
$array1= $this->_split($text1);
$array2= $this->_split($text2);
/* Build up array with the line as key and a list of line numbers as value */
foreach ($array1 as $nr => $line) {
$r_array1[$line][]= $nr;
}
foreach ($array2 as $nr => $line) {
$r_array2[$line][]= $nr;
}
$result= "";
$a[1]= 0; /* counter for array1 */
$a[2]= 0; /* counter for array2 */
$actions= array ();
while ($a[1] < sizeof($array1) && $a[2] < sizeof($array2)) {
# print "$a[1]:$a[2]\n";
if ($array1[$a[1]] == $array2[$a[2]]) {
$a[1]++;
$a[2]++;
$actions[]= 'copy';
} else {
/*
* $tmp1/2 is the next line in $array1/2 that equals
* $array2/1[$a2/1+1];
*/
$best[1]= count($array1);
$best[2]= count($array2);
$scan= $a;
# echo "distBest = ".dist($a, $best)."\n";
# echo "distScan = ".dist($a, $scan)."\n";
while ($this->dist($a, $scan) < $this->dist($a, $best)) {
# echo "A $a[1]:$a[2]\t";
# echo "Scan $scan[1]:$scan[2] ";
$tmp[1]= $this->nextOccurence($array2[$scan[2]], $r_array1, $scan[1]);
$tmp[2]= $scan[2];
if ($tmp[1] && $this->dist($a, $tmp) < $this->dist($a, $best))
$best= $tmp;
# echo "Tmp1 $tmp[1]:$tmp[2]\t";;
$tmp[1]= $scan[1];
$tmp[2]= $this->nextOccurence($array1[$scan[1]], $r_array2, $scan[2]);
if ($tmp[2] && $this->dist($a, $tmp) < $this->dist($a, $best))
$best= $tmp;
# echo "Tmp2 $tmp[1]:$tmp[2]\t";
# echo "Best $best[1]:$best[2]\n";
$scan[1]++;
$scan[2]++;
}
for ($i= $a[1]; $i < $best[1]; $i++) {
$actions[]= 'del';
}
for ($i= $a[2]; $i < $best[2]; $i++) {
$actions[]= 'add';
}
$a= $best;
}
}
# Here, we may still not be at the bottom left corner.
# So we have to get there. (This case happens, when we just append something to the page)
for ($i= $a[1]; $i < sizeof($array1); $i++) {
$actions[]= 'del';
}
for ($i= $a[2]; $i < sizeof($array2); $i++) {
$actions[]= 'add';
}
$actions[]= 'finish';
/* Now follow the way back and report connected (unequal) pieces */
$x= $xold= 0;
$y= $yold= 0;
$realAction= ""; /* the current action */
foreach ($actions as $action) {
if ($action == 'del') {
if ($realAction == "" || $realAction == "d") {
$realAction= "d";
} else {
$realAction= "c";
}
$x++;
}
if ($action == 'add') {
if ($realAction == "" || $realAction == "a") {
$realAction= "a";
} else {
$realAction= "c";
}
$y++;
}
if ($action == 'copy' || $action == 'finish') {
/* Prepare header for diff entry */
if ($xold +1 == $x) {
$xstr= $x;
} else {
$xstr= ($xold +1) . ",$x";
}
if ($yold +1 == $y) {
$ystr= $y;
} else {
$ystr= ($yold +1) . ",$y";
}
/* "Print" entry to result */
if ($realAction == "a") {
$result .= ($x) . "a$ystr\n";
for ($i= $yold; $i < $y; $i++) {
$result .= "> " . $array2[$i];
}
} else
if ($realAction == "d") {
$result .= ($xstr) . "d" . ($y) . "\n";
for ($i= $xold; $i < $x; $i++) {
$result .= "< " . $array1[$i];
}
} else
if ($realAction == "c") {
$result .= "$xstr$realAction$ystr\n";
for ($i= $xold; $i < $x; $i++) {
$result .= "< " . $array1[$i];
}
$result .= "---\n";
for ($i= $yold; $i < $y; $i++) {
$result .= "> " . $array2[$i];
}
}
$x++;
$y++;
$realAction= "";
$xold= $x;
$yold= $y;
}
}
return $result;
}
function cut_head(& $str, $key, $prefix) {
if (strpos($str, $prefix) === 0) {
$str= substr($str, strlen($prefix));
} else {
print "Something is wrong in the patch: ";
print "'$str' should begin with '$prefix'\n";
exit;
}
}
function restore($revisions= array (), $restore= 0) {
reset($revisions);
$restored= current($revisions);
if ($restore && next($revisions)) {
while (list($k, $v)= each($revisions)) {
if ($k > $restore)
break;
$restored= $this->patch($restored, $v);
}
}
return $restored;
}
function patch($text, $patch) {
$array= $this->_split($text);
/* Modify patch to an array so that it
* is compatible to the modification */
if ($patch == "")
return $text;
if (substr($patch, -1) == "\n")
$patch= substr($patch, 0, strlen($patch) - 1);
$patch_array= explode("\n", $patch);
for ($i= 0; $i < count($patch_array); $i++) {
$patch_array[$i]= $patch_array[$i] . "\n";
}
$i= 0;
$nlIndex= array_search("\\ No newline at end of file\n", $patch_array);
while ($nlIndex != false && $i < 2) {
/* This shouldn't be happening more than two times in a valid patch */
$newEntry= $patch_array[$nlIndex -1] . $patch_array[$nlIndex];
array_splice($patch_array, $nlIndex -1, 2, $newEntry);
$nlIndex= array_search("\\ No newline at end of file\n", $patch_array);
$i++;
}
/* Start computing */
$current= 0;
do {
if (preg_match("/^([\d,]+)([adc])([\d,]+)$/", $patch_array[$current], $matches) == 0) {
print "<pre>Error in line $current: " . $patch_array[$current] . " not a command\n" . sizeof($patch_array);
print "</pre>";
exit;
}
list ($full, $left, $action, $right)= $matches;
/* Compute start and end of each side */
list ($left_start, $left_end)= explode(",", $left);
list ($right_start, $right_end)= explode(",", $right);
if ($left_end == "") {
$left_end= $left_start;
}
if ($right_end == "") {
$right_end= $right_start;
}
/* Perform action and switch to next patch */
if ($action == "a") {
$replace= array_slice($patch_array, $current +1, $right_end - $right_start +1);
array_walk($replace, array ($this, 'cut_head'), '> ');
array_splice($array, $right_start -1, 0, $replace);
$current += $right_end - $right_start +2;
} else
if ($action == "d") {
/* Check whether lines in patch are like in file */
$should= array_slice($patch_array, $current +1, $left_end - $left_start +1);
array_walk($should, array ($this, 'cut_head'), '< ');
$is= array_splice($array, $right_start, $left_end - $left_start +1);
if ($should !== $is) {
print "<pre>According to the patch, in lines $left_start to ";
print "$left_end there should be a\n";
print urlencode(implode("", $should)) . "\n";
print "but I only find a\n";
print urlencode(implode("", $is)) . "\n</pre>";
}
$current += $left_end - $left_start +2;
} else
if ($action == "c") {
$replace= array_slice($patch_array, $current +1 + $left_end - $left_start +2, $right_end - $right_start +1);
array_walk($replace, array ($this, 'cut_head'), '> ');
$is= array_splice($array, $right_start -1, $left_end - $left_start +1, $replace);
/* Check whether lines in patch are like in text */
$should= array_slice($patch_array, $current +1, $left_end - $left_start +1);
array_walk($should, array ($this, 'cut_head'), '< ');
if ($should !== $is) {
print "<pre>According to the patch, in lines $left_start to";
print "$left_end there should be a\n";
print implode("", $should);
print "but I only find a\n";
print implode("", $is) . "</pre>";
}
$current += 1 + $left_end - $left_start +1 + 1 + $right_end - $right_start +1;
}
} while ($current < count($patch_array));
$result= implode("", $array);
$suffix= "\n\\ No newline at end of file\n";
if (substr($result, -strlen($suffix)) == $suffix) {
$result= substr($result, 0, strlen($result) - strlen($suffix));
}
return $result;
}
/**
* Checks, if there is a line number-entry in $r_array for $line,
* that is behind $where.
* $where will be assigned the line-number, if true
*/
function nextOccurence($line, & $r_array, $where) {
$tmp= $r_array[$line];
if (!$tmp)
return false;
foreach ($tmp as $nr) {
if ($where <= $nr) {
$where= $nr;
return $nr;
}
}
return false;
}
/**
* Compute the manhatten distance of two points
*/
function dist($a, $b) {
$d1= $b[1] - $a[1];
$d2= $b[2] - $a[2];
return $d2 + $d1;
}
function _split($text) {
$array= explode("\n", $text);
for ($i= 0; $i < count($array); $i++) {
$array[$i]= $array[$i] . "\n";
}
if ($array[count($array) - 1] == "\n") {
array_pop($array);
} else {
$array[count($array) - 1]= $array[count($array) - 1] . "\\ No newline at end of file\n";
}
return $array;
}
}