+ /**
+ * Build a diff display between this and the previous either deleted
+ * or non-deleted edit.
+ * @param Revision $previousRev
+ * @param Revision $currentRev
+ * @return string HTML
+ */
+ function showDiff( $previousRev, $currentRev ) {
+ global $wgOut, $wgUser;
+
+ $diffEngine = new DifferenceEngine();
+ $diffEngine->showDiffStyle();
+ $wgOut->addHtml(
+ "<div>" .
+ "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
+ "<col class='diff-marker' />" .
+ "<col class='diff-content' />" .
+ "<col class='diff-marker' />" .
+ "<col class='diff-content' />" .
+ "<tr>" .
+ "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
+ $this->diffHeader( $previousRev ) .
+ "</td>" .
+ "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
+ $this->diffHeader( $currentRev ) .
+ "</td>" .
+ "</tr>" .
+ $diffEngine->generateDiffBody(
+ $previousRev->getText(), $currentRev->getText() ) .
+ "</table>" .
+ "</div>\n" );
+
+ }
+
+ private function diffHeader( $rev ) {
+ global $wgUser, $wgLang, $wgLang;
+ $sk = $wgUser->getSkin();
+ $isDeleted = !( $rev->getId() && $rev->getTitle() );
+ if( $isDeleted ) {
+ /// @fixme $rev->getTitle() is null for deleted revs...?
+ $targetPage = SpecialPage::getTitleFor( 'Undelete' );
+ $targetQuery = 'target=' .
+ $this->mTargetObj->getPrefixedUrl() .
+ '×tamp=' .
+ wfTimestamp( TS_MW, $rev->getTimestamp() );
+ } else {
+ /// @fixme getId() may return non-zero for deleted revs...
+ $targetPage = $rev->getTitle();
+ $targetQuery = 'oldid=' . $rev->getId();
+ }
+ return
+ '<div id="mw-diff-otitle1"><strong>' .
+ $sk->makeLinkObj( $targetPage,
+ wfMsgHtml( 'revisionasof',
+ $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
+ $targetQuery ) .
+ ( $isDeleted ? ' ' . wfMsgHtml( 'deletedrev' ) : '' ) .
+ '</strong></div>' .
+ '<div id="mw-diff-otitle2">' .
+ $sk->revUserTools( $rev ) . '<br/>' .
+ '</div>' .
+ '<div id="mw-diff-otitle3">' .
+ $sk->revComment( $rev ) . '<br/>' .
+ '</div>';
+ }
+