_lines = array();
$this->_line = '';
$this->_group = '';
$this->_tag = '';
}
function _flushGroup ($new_tag) {
if ($this->_group !== '') {
if ($this->_tag == 'mark')
$this->_line .= '' .
htmlspecialchars ( $this->_group ) . '';
else
$this->_line .= htmlspecialchars ( $this->_group );
}
$this->_group = '';
$this->_tag = $new_tag;
}
function _flushLine ($new_tag) {
$this->_flushGroup($new_tag);
if ($this->_line != '')
array_push ( $this->_lines, $this->_line );
else
array_push ( $this->_lines, NBSP );
$this->_line = '';
}
function addWords ($words, $tag = '') {
if ($tag != $this->_tag)
$this->_flushGroup($tag);
foreach ($words as $word) {
if ($word == '')
continue;
if ($word[0] == "\n") {
$this->_flushLine($tag);
$word = substr($word, 1);
}
assert(!strstr($word, "\n"));
$this->_group .= $word;
}
}
function getLines() {
$this->_flushLine('~done');
return $this->_lines;
}
}
class MappedDiff extends Diff
{
function MappedDiff($from_lines, $to_lines,
$mapped_from_lines, $mapped_to_lines) {
assert(sizeof($from_lines) == sizeof($mapped_from_lines));
assert(sizeof($to_lines) == sizeof($mapped_to_lines));
$this->Diff($mapped_from_lines, $mapped_to_lines);
$xi = $yi = 0;
for ($i = 0; $i < sizeof($this->edits); $i++) {
$orig = &$this->edits[$i]->orig;
if (is_array($orig)) {
$orig = array_slice($from_lines, $xi, sizeof($orig));
$xi += sizeof($orig);
}
$closing = &$this->edits[$i]->closing;
if (is_array($closing)) {
$closing = array_slice($to_lines, $yi, sizeof($closing));
$yi += sizeof($closing);
}
}
}
}
class WordLevelDiff extends MappedDiff
{
function WordLevelDiff ($orig_lines, $closing_lines) {
list ($orig_words, $orig_stripped) = $this->_split($orig_lines);
list ($closing_words, $closing_stripped) = $this->_split($closing_lines);
$this->MappedDiff($orig_words, $closing_words,
$orig_stripped, $closing_stripped);
}
function _split($lines) {
if (!preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs',
implode("\n", $lines),
$m)) {
return array(array(''), array(''));
}
return array($m[0], $m[1]);
}
function orig () {
$orig = new _HWLDF_WordAccumulator;
foreach ($this->edits as $edit) {
if ($edit->type == 'copy')
$orig->addWords($edit->orig);
elseif ($edit->orig)
$orig->addWords($edit->orig, 'mark');
}
$lines = $orig->getLines();
return $lines;
}
function closing () {
$closing = new _HWLDF_WordAccumulator;
foreach ($this->edits as $edit) {
if ($edit->type == 'copy')
$closing->addWords($edit->closing);
elseif ($edit->closing)
$closing->addWords($edit->closing, 'mark');
}
$lines = $closing->getLines();
return $lines;
}
}
class DiffFormatter
{
var $leading_context_lines = 0;
var $trailing_context_lines = 0;
function format($diff) {
$xi = $yi = 1;
$block = false;
$context = array();
$nlead = $this->leading_context_lines;
$ntrail = $this->trailing_context_lines;
$this->_start_diff();
foreach ($diff->edits as $edit) {
if ($edit->type == 'copy') {
if (is_array($block)) {
if (sizeof($edit->orig) <= $nlead + $ntrail) {
$block[] = $edit;
}
else{
if ($ntrail) {
$context = array_slice($edit->orig, 0, $ntrail);
$block[] = new _DiffOp_Copy($context);
}
$this->_block($x0, $ntrail + $xi - $x0,
$y0, $ntrail + $yi - $y0,
$block);
$block = false;
}
}
$context = $edit->orig;
}
else {
if (! is_array($block)) {
$context = array_slice($context, sizeof($context) - $nlead);
$x0 = $xi - sizeof($context);
$y0 = $yi - sizeof($context);
$block = array();
if ($context)
$block[] = new _DiffOp_Copy($context);
}
$block[] = $edit;
}
if ($edit->orig)
$xi += sizeof($edit->orig);
if ($edit->closing)
$yi += sizeof($edit->closing);
}
if (is_array($block))
$this->_block($x0, $xi - $x0,
$y0, $yi - $y0,
$block);
$end = $this->_end_diff();
return $end;
}
function _block($xbeg, $xlen, $ybeg, $ylen, &$edits) {
$this->_start_block($this->_block_header($xbeg, $xlen, $ybeg, $ylen));
foreach ($edits as $edit) {
if ($edit->type == 'copy')
$this->_context($edit->orig);
elseif ($edit->type == 'add')
$this->_added($edit->closing);
elseif ($edit->type == 'delete')
$this->_deleted($edit->orig);
elseif ($edit->type == 'change')
$this->_changed($edit->orig, $edit->closing);
else
trigger_error('Unknown edit type', E_USER_ERROR);
}
$this->_end_block();
}
function _start_diff() {
ob_start();
}
function _end_diff() {
$val = ob_get_contents();
ob_end_clean();
return $val;
}
function _block_header($xbeg, $xlen, $ybeg, $ylen) {
if ($xlen > 1)
$xbeg .= "," . ($xbeg + $xlen - 1);
if ($ylen > 1)
$ybeg .= "," . ($ybeg + $ylen - 1);
return $xbeg . ($xlen ? ($ylen ? 'c' : 'd') : 'a') . $ybeg;
}
function _start_block($header) {
echo $header;
}
function _end_block() {
}
function _lines($lines, $prefix = ' ') {
foreach ($lines as $line)
echo "$prefix $line\n";
}
function _context($lines) {
$this->_lines($lines);
}
function _added($lines) {
$this->_lines($lines, '>');
}
function _deleted($lines) {
$this->_lines($lines, '<');
}
function _changed($orig, $closing) {
$this->_deleted($orig);
echo "---\n";
$this->_added($closing);
}
}
class TableDiffFormatter extends DiffFormatter
{
function TableDiffFormatter() {
$this->leading_context_lines = 2;
$this->trailing_context_lines = 2;
}
function _block_header( $xbeg, $xlen, $ybeg, $ylen ) {
# $l1 = wfMsg( 'lineno', $xbeg );
$l1 = 'Zeile ' . $xbeg . ':';
# $l2 = wfMsg( 'lineno', $ybeg );
$l2 = 'Zeile ' . $ybeg . ':';
$r = '| '.$l1." | \n" .
''.$l2." |
\n";
return $r;
}
function _start_block( $header ) {
global $wgOut;
echo $header;
}
function _end_block() {
}
function _lines( $lines, $prefix=' ', $color='white' ) {
}
# HTML-escape parameter before calling this
function addedLine( $line ) {
return "+ | {$line} | ";
}
# HTML-escape parameter before calling this
function deletedLine( $line ) {
return "- | {$line} | ";
}
# HTML-escape parameter before calling this
function contextLine( $line ) {
return " | {$line} | ";
}
function emptyLine() {
return ' | ';
}
function _added( $lines ) {
foreach ($lines as $line) {
echo '' . $this->emptyLine() .
$this->addedLine( htmlspecialchars ( $line ) ) . "
\n";
}
}
function _deleted($lines) {
foreach ($lines as $line) {
echo '' . $this->deletedLine( htmlspecialchars ( $line ) ) .
$this->emptyLine() . "
\n";
}
}
function _context( $lines ) {
foreach ($lines as $line) {
echo '' .
$this->contextLine( htmlspecialchars ( $line ) ) .
$this->contextLine( htmlspecialchars ( $line ) ) . "
\n";
}
}
function _changed( $orig, $closing ) {
$diff = new WordLevelDiff( $orig, $closing );
$del = $diff->orig();
$add = $diff->closing();
while ( $line = array_shift( $del ) ) {
$aline = array_shift( $add );
echo '' . $this->deletedLine( $line ) .
$this->addedLine( $aline ) . "
\n";
}
foreach ($add as $line) { # If any leftovers
echo '' . $this->emptyLine() .
$this->addedLine( $line ) . "
\n";
}
}
}
class _DiffOp {
var $type;
var $orig;
var $closing;
function reverse() {
trigger_error('pure virtual', E_USER_ERROR);
}
function norig() {
return $this->orig ? sizeof($this->orig) : 0;
}
function nclosing() {
return $this->closing ? sizeof($this->closing) : 0;
}
}
class _DiffOp_Copy extends _DiffOp {
var $type = 'copy';
function _DiffOp_Copy ($orig, $closing = false) {
if (!is_array($closing))
$closing = $orig;
$this->orig = $orig;
$this->closing = $closing;
}
function reverse() {
return new _DiffOp_Copy($this->closing, $this->orig);
}
}
class _DiffOp_Delete extends _DiffOp {
var $type = 'delete';
function _DiffOp_Delete ($lines) {
$this->orig = $lines;
$this->closing = false;
}
function reverse() {
return new _DiffOp_Add($this->orig);
}
}
class _DiffOp_Add extends _DiffOp {
var $type = 'add';
function _DiffOp_Add ($lines) {
$this->closing = $lines;
$this->orig = false;
}
function reverse() {
return new _DiffOp_Delete($this->closing);
}
}
class _DiffOp_Change extends _DiffOp {
var $type = 'change';
function _DiffOp_Change ($orig, $closing) {
$this->orig = $orig;
$this->closing = $closing;
}
function reverse() {
return new _DiffOp_Change($this->closing, $this->orig);
}
}
class _DiffEngine
{
function diff ($from_lines, $to_lines) {
$n_from = sizeof($from_lines);
$n_to = sizeof($to_lines);
$this->xchanged = $this->ychanged = array();
$this->xv = $this->yv = array();
$this->xind = $this->yind = array();
unset($this->seq);
unset($this->in_seq);
unset($this->lcs);
for ($skip = 0; $skip < $n_from && $skip < $n_to; $skip++) {
if ($from_lines[$skip] != $to_lines[$skip])
break;
$this->xchanged[$skip] = $this->ychanged[$skip] = false;
}
$xi = $n_from; $yi = $n_to;
for ($endskip = 0; --$xi > $skip && --$yi > $skip; $endskip++) {
if ($from_lines[$xi] != $to_lines[$yi])
break;
$this->xchanged[$xi] = $this->ychanged[$yi] = false;
}
for ($xi = $skip; $xi < $n_from - $endskip; $xi++)
$xhash[$from_lines[$xi]] = 1;
for ($yi = $skip; $yi < $n_to - $endskip; $yi++) {
$line = $to_lines[$yi];
if ( ($this->ychanged[$yi] = empty($xhash[$line])) )
continue;
$yhash[$line] = 1;
$this->yv[] = $line;
$this->yind[] = $yi;
}
for ($xi = $skip; $xi < $n_from - $endskip; $xi++) {
$line = $from_lines[$xi];
if ( ($this->xchanged[$xi] = empty($yhash[$line])) )
continue;
$this->xv[] = $line;
$this->xind[] = $xi;
}
$this->_compareseq(0, sizeof($this->xv), 0, sizeof($this->yv));
$this->_shift_boundaries($from_lines, $this->xchanged, $this->ychanged);
$this->_shift_boundaries($to_lines, $this->ychanged, $this->xchanged);
$edits = array();
$xi = $yi = 0;
while ($xi < $n_from || $yi < $n_to) {
USE_ASSERTS && assert($yi < $n_to || $this->xchanged[$xi]);
USE_ASSERTS && assert($xi < $n_from || $this->ychanged[$yi]);
$copy = array();
while ( $xi < $n_from && $yi < $n_to
&& !$this->xchanged[$xi] && !$this->ychanged[$yi]) {
$copy[] = $from_lines[$xi++];
++$yi;
}
if ($copy)
$edits[] = new _DiffOp_Copy($copy);
$delete = array();
while ($xi < $n_from && $this->xchanged[$xi])
$delete[] = $from_lines[$xi++];
$add = array();
while ($yi < $n_to && $this->ychanged[$yi])
$add[] = $to_lines[$yi++];
if ($delete && $add)
$edits[] = new _DiffOp_Change($delete, $add);
elseif ($delete)
$edits[] = new _DiffOp_Delete($delete);
elseif ($add)
$edits[] = new _DiffOp_Add($add);
}
return $edits;
}
function _diag ($xoff, $xlim, $yoff, $ylim, $nchunks) {
$flip = false;
if ($xlim - $xoff > $ylim - $yoff) {
$flip = true;
list ($xoff, $xlim, $yoff, $ylim)
= array( $yoff, $ylim, $xoff, $xlim);
}
if ($flip)
for ($i = $ylim - 1; $i >= $yoff; $i--)
$ymatches[$this->xv[$i]][] = $i;
else
for ($i = $ylim - 1; $i >= $yoff; $i--)
$ymatches[$this->yv[$i]][] = $i;
$this->lcs = 0;
$this->seq[0]= $yoff - 1;
$this->in_seq = array();
$ymids[0] = array();
$numer = $xlim - $xoff + $nchunks - 1;
$x = $xoff;
for ($chunk = 0; $chunk < $nchunks; $chunk++) {
if ($chunk > 0)
for ($i = 0; $i <= $this->lcs; $i++)
$ymids[$i][$chunk-1] = $this->seq[$i];
$x1 = $xoff + (int)(($numer + ($xlim-$xoff)*$chunk) / $nchunks);
for ( ; $x < $x1; $x++) {
$line = $flip ? $this->yv[$x] : $this->xv[$x];
if (empty($ymatches[$line]))
continue;
$matches = $ymatches[$line];
reset($matches);
while (list ($junk, $y) = each($matches))
if (empty($this->in_seq[$y])) {
$k = $this->_lcs_pos($y);
USE_ASSERTS && assert($k > 0);
$ymids[$k] = $ymids[$k-1];
break;
}
while (list ($junk, $y) = each($matches)) {
if ($y > $this->seq[$k-1]) {
USE_ASSERTS && assert($y < $this->seq[$k]);
$this->in_seq[$this->seq[$k]] = false;
$this->seq[$k] = $y;
$this->in_seq[$y] = 1;
} else if (empty($this->in_seq[$y])) {
$k = $this->_lcs_pos($y);
USE_ASSERTS && assert($k > 0);
$ymids[$k] = $ymids[$k-1];
}
}
}
}
$seps[] = $flip ? array($yoff, $xoff) : array($xoff, $yoff);
$ymid = $ymids[$this->lcs];
for ($n = 0; $n < $nchunks - 1; $n++) {
$x1 = $xoff + (int)(($numer + ($xlim - $xoff) * $n) / $nchunks);
$y1 = $ymid[$n] + 1;
$seps[] = $flip ? array($y1, $x1) : array($x1, $y1);
}
$seps[] = $flip ? array($ylim, $xlim) : array($xlim, $ylim);
return array($this->lcs, $seps);
}
function _lcs_pos ($ypos) {
$end = $this->lcs;
if ($end == 0 || $ypos > $this->seq[$end]) {
$this->seq[++$this->lcs] = $ypos;
$this->in_seq[$ypos] = 1;
return $this->lcs;
}
$beg = 1;
while ($beg < $end) {
$mid = (int)(($beg + $end) / 2);
if ( $ypos > $this->seq[$mid] )
$beg = $mid + 1;
else
$end = $mid;
}
USE_ASSERTS && assert($ypos != $this->seq[$end]);
$this->in_seq[$this->seq[$end]] = false;
$this->seq[$end] = $ypos;
$this->in_seq[$ypos] = 1;
return $end;
}
function _compareseq ($xoff, $xlim, $yoff, $ylim) {
while ($xoff < $xlim && $yoff < $ylim
&& $this->xv[$xoff] == $this->yv[$yoff]) {
++$xoff;
++$yoff;
}
while ($xlim > $xoff && $ylim > $yoff
&& $this->xv[$xlim - 1] == $this->yv[$ylim - 1]) {
--$xlim;
--$ylim;
}
if ($xoff == $xlim || $yoff == $ylim)
$lcs = 0;
else {
$nchunks = min(7, $xlim - $xoff, $ylim - $yoff) + 1;
list ($lcs, $seps)
= $this->_diag($xoff,$xlim,$yoff, $ylim,$nchunks);
}
if ($lcs == 0) {
while ($yoff < $ylim)
$this->ychanged[$this->yind[$yoff++]] = 1;
while ($xoff < $xlim)
$this->xchanged[$this->xind[$xoff++]] = 1;
} else {
reset($seps);
$pt1 = $seps[0];
while ($pt2 = next($seps)) {
$this->_compareseq ($pt1[0], $pt2[0], $pt1[1], $pt2[1]);
$pt1 = $pt2;
}
}
}
function _shift_boundaries ($lines, &$changed, $other_changed) {
$i = 0;
$j = 0;
USE_ASSERTS && assert('sizeof($lines) == sizeof($changed)');
$len = sizeof($lines);
$other_len = sizeof($other_changed);
while (1) {
while ($j < $other_len && $other_changed[$j])
$j++;
while ($i < $len && ! $changed[$i]) {
USE_ASSERTS && assert('$j < $other_len && ! $other_changed[$j]');
$i++; $j++;
while ($j < $other_len && $other_changed[$j])
$j++;
}
if ($i == $len)
break;
$start = $i;
while (++$i < $len && $changed[$i])
continue;
do {
$runlength = $i - $start;
while ($start > 0 && $lines[$start - 1] == $lines[$i - 1]) {
$changed[--$start] = 1;
$changed[--$i] = false;
while ($start > 0 && $changed[$start - 1])
$start--;
USE_ASSERTS && assert('$j > 0');
while ($other_changed[--$j])
continue;
USE_ASSERTS && assert('$j >= 0 && !$other_changed[$j]');
}
$corresponding = $j < $other_len ? $i : $len;
while ($i < $len && $lines[$start] == $lines[$i]) {
$changed[$start++] = false;
$changed[$i++] = 1;
while ($i < $len && $changed[$i])
$i++;
USE_ASSERTS && assert('$j < $other_len && ! $other_changed[$j]');
$j++;
if ($j < $other_len && $other_changed[$j]) {
$corresponding = $i;
while ($j < $other_len && $other_changed[$j])
$j++;
}
}
} while ($runlength != $i - $start);
while ($corresponding < $i) {
$changed[--$start] = 1;
$changed[--$i] = 0;
USE_ASSERTS && assert('$j > 0');
while ($other_changed[--$j])
continue;
USE_ASSERTS && assert('$j >= 0 && !$other_changed[$j]');
}
}
}
}
class Diff
{
var $edits;
function Diff($from_lines, $to_lines) {
$eng = new _DiffEngine;
$this->edits = $eng->diff($from_lines, $to_lines);
}
function reverse () {
$rev = $this;
$rev->edits = array();
foreach ($this->edits as $edit) {
$rev->edits[] = $edit->reverse();
}
return $rev;
}
function isEmpty () {
foreach ($this->edits as $edit) {
if ($edit->type != 'copy')
return false;
}
return true;
}
function lcs () {
$lcs = 0;
foreach ($this->edits as $edit) {
if ($edit->type == 'copy')
$lcs += sizeof($edit->orig);
}
return $lcs;
}
function orig() {
$lines = array();
foreach ($this->edits as $edit) {
if ($edit->orig)
array_splice($lines, sizeof($lines), 0, $edit->orig);
}
return $lines;
}
function closing() {
$lines = array();
foreach ($this->edits as $edit) {
if ($edit->closing)
array_splice($lines, sizeof($lines), 0, $edit->closing);
}
return $lines;
}
function _check ($from_lines, $to_lines) {
if (serialize($from_lines) != serialize($this->orig()))
trigger_error("Reconstructed original doesn't match", E_USER_ERROR);
if (serialize($to_lines) != serialize($this->closing()))
trigger_error("Reconstructed closing doesn't match", E_USER_ERROR);
$rev = $this->reverse();
if (serialize($to_lines) != serialize($rev->orig()))
trigger_error("Reversed original doesn't match", E_USER_ERROR);
if (serialize($from_lines) != serialize($rev->closing()))
trigger_error("Reversed closing doesn't match", E_USER_ERROR);
$prevtype = 'none';
foreach ($this->edits as $edit) {
if ( $prevtype == $edit->type )
trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
$prevtype = $edit->type;
}
$lcs = $this->lcs();
trigger_error('Diff okay: LCS = '.$lcs, E_USER_NOTICE);
}
}
?>