/**
* Get a diff between the current contents of the edit box and the
* version of the page we're editing from.
*
* If this is a section edit, we'll replace the section as for final
* save and then make a comparison.
*/
function showDiff()
{
global $wgUser, $wgContLang, $wgOut;
$oldtitlemsg = 'currentrev';
# if message does not exist, show diff against the preloaded default
if ($this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists()) {
$oldtext = $this->mTitle->getDefaultMessageText();
if ($oldtext !== false) {
$oldtitlemsg = 'defaultmessagetext';
$oldContent = $this->toEditContent($oldtext);
} else {
$oldContent = null;
}
} else {
$oldContent = $this->getCurrentContent();
}
$textboxContent = $this->toEditContent($this->textbox1);
$newContent = $this->mArticle->replaceSectionContent($this->section, $textboxContent, $this->summary, $this->edittime);
if ($newContent) {
ContentHandler::runLegacyHooks('EditPageGetDiffText', array($this, &$newContent));
wfRunHooks('EditPageGetDiffContent', array($this, &$newContent));
$popts = ParserOptions::newFromUserAndLang($wgUser, $wgContLang);
$newContent = $newContent->preSaveTransform($this->mTitle, $wgUser, $popts);
}
if ($oldContent && !$oldContent->isEmpty() || $newContent && !$newContent->isEmpty()) {
$oldtitle = wfMessage($oldtitlemsg)->parse();
$newtitle = wfMessage('yourtext')->parse();
if (!$oldContent) {
$oldContent = $newContent->getContentHandler()->makeEmptyContent();
}
if (!$newContent) {
$newContent = $oldContent->getContentHandler()->makeEmptyContent();
}
$de = $oldContent->getContentHandler()->createDifferenceEngine($this->mArticle->getContext());
$de->setContent($oldContent, $newContent);
$difftext = $de->getDiff($oldtitle, $newtitle);
$de->showDiffStyle();
} else {
$difftext = '';
}
$wgOut->addHTML('<div id="wikiDiff">' . $difftext . '</div>');
}
