--- /dev/null
+<?php
+/**
+ * @defgroup DifferenceEngine DifferenceEngine
+ */
+
+/**
+ * Constant to indicate diff cache compatibility.
+ * Bump this when changing the diff formatting in a way that
+ * fixes important bugs or such to force cached diff views to
+ * clear.
+ */
+define( 'MW_DIFF_VERSION', '1.11a' );
+
+/**
+ * @todo document
+ * @ingroup DifferenceEngine
+ */
+class DifferenceEngine {
+ /**#@+
+ * @private
+ */
+ var $mOldid, $mNewid, $mTitle;
+ var $mOldtitle, $mNewtitle, $mPagetitle;
+ var $mOldtext, $mNewtext;
+ var $mOldPage, $mNewPage;
+ var $mRcidMarkPatrolled;
+ var $mOldRev, $mNewRev;
+ var $mRevisionsLoaded = false; // Have the revisions been loaded
+ var $mTextLoaded = 0; // How many text blobs have been loaded, 0, 1 or 2?
+ var $mCacheHit = false; // Was the diff fetched from cache?
+
+ /**
+ * Set this to true to add debug info to the HTML output.
+ * Warning: this may cause RSS readers to spuriously mark articles as "new"
+ * (bug 20601)
+ */
+ var $enableDebugComment = false;
+
+ // If true, line X is not displayed when X is 1, for example to increase
+ // readability and conserve space with many small diffs.
+ protected $mReducedLineNumbers = false;
+
+ protected $unhide = false;
+ /**#@-*/
+
+ /**
+ * Constructor
+ * @param $titleObj Title object that the diff is associated with
+ * @param $old Integer: old ID we want to show and diff with.
+ * @param $new String: either 'prev' or 'next'.
+ * @param $rcid Integer: ??? FIXME (default 0)
+ * @param $refreshCache boolean If set, refreshes the diff cache
+ * @param $unhide boolean If set, allow viewing deleted revs
+ */
+ function __construct( $titleObj = null, $old = 0, $new = 0, $rcid = 0,
+ $refreshCache = false, $unhide = false )
+ {
+ if ( $titleObj ) {
+ $this->mTitle = $titleObj;
+ } else {
+ global $wgTitle;
+ $this->mTitle = $wgTitle;
+ }
+ wfDebug("DifferenceEngine old '$old' new '$new' rcid '$rcid'\n");
+
+ if ( 'prev' === $new ) {
+ # Show diff between revision $old and the previous one.
+ # Get previous one from DB.
+ $this->mNewid = intval($old);
+ $this->mOldid = $this->mTitle->getPreviousRevisionID( $this->mNewid );
+ } elseif ( 'next' === $new ) {
+ # Show diff between revision $old and the next one.
+ # Get next one from DB.
+ $this->mOldid = intval($old);
+ $this->mNewid = $this->mTitle->getNextRevisionID( $this->mOldid );
+ if ( false === $this->mNewid ) {
+ # if no result, NewId points to the newest old revision. The only newer
+ # revision is cur, which is "0".
+ $this->mNewid = 0;
+ }
+ } else {
+ $this->mOldid = intval($old);
+ $this->mNewid = intval($new);
+ wfRunHooks( 'NewDifferenceEngine', array(&$titleObj, &$this->mOldid, &$this->mNewid, $old, $new) );
+ }
+ $this->mRcidMarkPatrolled = intval($rcid); # force it to be an integer
+ $this->mRefreshCache = $refreshCache;
+ $this->unhide = $unhide;
+ }
+
+ function setReducedLineNumbers( $value = true ) {
+ $this->mReducedLineNumbers = $value;
+ }
+
+ function getTitle() {
+ return $this->mTitle;
+ }
+
+ function wasCacheHit() {
+ return $this->mCacheHit;
+ }
+
+ function getOldid() {
+ return $this->mOldid;
+ }
+
+ function getNewid() {
+ return $this->mNewid;
+ }
+
+ function showDiffPage( $diffOnly = false ) {
+ global $wgUser, $wgOut, $wgUseExternalEditor, $wgUseRCPatrol;
+ wfProfileIn( __METHOD__ );
+
+
+ # If external diffs are enabled both globally and for the user,
+ # we'll use the application/x-external-editor interface to call
+ # an external diff tool like kompare, kdiff3, etc.
+ if($wgUseExternalEditor && $wgUser->getOption('externaldiff')) {
+ global $wgInputEncoding,$wgServer,$wgScript,$wgLang;
+ $wgOut->disable();
+ header ( "Content-type: application/x-external-editor; charset=".$wgInputEncoding );
+ $url1=$this->mTitle->getFullURL( array(
+ 'action' => 'raw',
+ 'oldid' => $this->mOldid
+ ) );
+ $url2=$this->mTitle->getFullURL( array(
+ 'action' => 'raw',
+ 'oldid' => $this->mNewid
+ ) );
+ $special=$wgLang->getNsText(NS_SPECIAL);
+ $control=<<<CONTROL
+ [Process]
+ Type=Diff text
+ Engine=MediaWiki
+ Script={$wgServer}{$wgScript}
+ Special namespace={$special}
+
+ [File]
+ Extension=wiki
+ URL=$url1
+
+ [File 2]
+ Extension=wiki
+ URL=$url2
+CONTROL;
+ echo($control);
+ return;
+ }
+
+ $wgOut->setArticleFlag( false );
+ if ( !$this->loadRevisionData() ) {
+ $t = $this->mTitle->getPrefixedText();
+ $d = wfMsgExt( 'missingarticle-diff', array( 'escape' ), $this->mOldid, $this->mNewid );
+ $wgOut->setPagetitle( wfMsg( 'errorpagetitle' ) );
+ $wgOut->addWikiMsg( 'missing-article', "<nowiki>$t</nowiki>", $d );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+
+ wfRunHooks( 'DiffViewHeader', array( $this, $this->mOldRev, $this->mNewRev ) );
+
+ if ( $this->mNewRev->isCurrent() ) {
+ $wgOut->setArticleFlag( true );
+ }
+
+ # mOldid is false if the difference engine is called with a "vague" query for
+ # a diff between a version V and its previous version V' AND the version V
+ # is the first version of that article. In that case, V' does not exist.
+ if ( $this->mOldid === false ) {
+ $this->showFirstRevision();
+ $this->renderNewRevision(); // should we respect $diffOnly here or not?
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+
+ $wgOut->suppressQuickbar();
+
+ $oldTitle = $this->mOldPage->getPrefixedText();
+ $newTitle = $this->mNewPage->getPrefixedText();
+ if( $oldTitle == $newTitle ) {
+ $wgOut->setPageTitle( $newTitle );
+ } else {
+ $wgOut->setPageTitle( $oldTitle . ', ' . $newTitle );
+ }
+ $wgOut->setSubtitle( wfMsgExt( 'difference', array( 'parseinline' ) ) );
+ $wgOut->setRobotPolicy( 'noindex,nofollow' );
+
+ if ( !$this->mOldPage->userCanRead() || !$this->mNewPage->userCanRead() ) {
+ $wgOut->loginToUse();
+ $wgOut->output();
+ $wgOut->disable();
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+
+ $sk = $wgUser->getSkin();
+
+ // Check if page is editable
+ $editable = $this->mNewRev->getTitle()->userCan( 'edit' );
+ if ( $editable && $this->mNewRev->isCurrent() && $wgUser->isAllowed( 'rollback' ) ) {
+ $rollback = ' ' . $sk->generateRollback( $this->mNewRev );
+ } else {
+ $rollback = '';
+ }
+
+ // Prepare a change patrol link, if applicable
+ if( $wgUseRCPatrol && $this->mTitle->userCan('patrol') ) {
+ // If we've been given an explicit change identifier, use it; saves time
+ if( $this->mRcidMarkPatrolled ) {
+ $rcid = $this->mRcidMarkPatrolled;
+ $rc = RecentChange::newFromId( $rcid );
+ // Already patrolled?
+ $rcid = is_object($rc) && !$rc->getAttribute('rc_patrolled') ? $rcid : 0;
+ } else {
+ // Look for an unpatrolled change corresponding to this diff
+ $db = wfGetDB( DB_SLAVE );
+ $change = RecentChange::newFromConds(
+ array(
+ // Redundant user,timestamp condition so we can use the existing index
+ 'rc_user_text' => $this->mNewRev->getRawUserText(),
+ 'rc_timestamp' => $db->timestamp( $this->mNewRev->getTimestamp() ),
+ 'rc_this_oldid' => $this->mNewid,
+ 'rc_last_oldid' => $this->mOldid,
+ 'rc_patrolled' => 0
+ ),
+ __METHOD__
+ );
+ if( $change instanceof RecentChange ) {
+ $rcid = $change->mAttribs['rc_id'];
+ $this->mRcidMarkPatrolled = $rcid;
+ } else {
+ // None found
+ $rcid = 0;
+ }
+ }
+ // Build the link
+ if( $rcid ) {
+ $patrol = ' <span class="patrollink">[' . $sk->link(
+ $this->mTitle,
+ wfMsgHtml( 'markaspatrolleddiff' ),
+ array(),
+ array(
+ 'action' => 'markpatrolled',
+ 'rcid' => $rcid
+ ),
+ array(
+ 'known',
+ 'noclasses'
+ )
+ ) . ']</span>';
+ } else {
+ $patrol = '';
+ }
+ } else {
+ $patrol = '';
+ }
+
+ # Carry over 'diffonly' param via navigation links
+ if( $diffOnly != $wgUser->getBoolOption('diffonly') ) {
+ $query['diffonly'] = $diffOnly;
+ }
+
+ # Make "previous revision link"
+ $query['diff'] = 'prev';
+ $query['oldid'] = $this->mOldid;
+ # Cascade unhide param in links for easy deletion browsing
+ if( $this->unhide ) {
+ $query['unhide'] = 1;
+ }
+ $prevlink = $sk->link(
+ $this->mTitle,
+ wfMsgHtml( 'previousdiff' ),
+ array(
+ 'id' => 'differences-prevlink'
+ ),
+ $query,
+ array(
+ 'known',
+ 'noclasses'
+ )
+ );
+
+ # Make "next revision link"
+ $query['diff'] = 'next';
+ $query['oldid'] = $this->mNewid;
+ # Skip next link on the top revision
+ if( $this->mNewRev->isCurrent() ) {
+ $nextlink = ' ';
+ } else {
+ $nextlink = $sk->link(
+ $this->mTitle,
+ wfMsgHtml( 'nextdiff' ),
+ array(
+ 'id' => 'differences-nextlink'
+ ),
+ $query,
+ array(
+ 'known',
+ 'noclasses'
+ )
+ );
+ }
+
+ $oldminor = '';
+ $newminor = '';
+
+ if( $this->mOldRev->isMinor() ) {
+ $oldminor = ChangesList::flag( 'minor' );
+ }
+ if( $this->mNewRev->isMinor() ) {
+ $newminor = ChangesList::flag( 'minor' );
+ }
+
+ # Handle RevisionDelete links...
+ $ldel = $this->revisionDeleteLink( $this->mOldRev );
+ $rdel = $this->revisionDeleteLink( $this->mNewRev );
+
+ $oldHeader = '<div id="mw-diff-otitle1"><strong>'.$this->mOldtitle.'</strong></div>' .
+ '<div id="mw-diff-otitle2">' .
+ $sk->revUserTools( $this->mOldRev, !$this->unhide ).'</div>' .
+ '<div id="mw-diff-otitle3">' . $oldminor .
+ $sk->revComment( $this->mOldRev, !$diffOnly, !$this->unhide ).$ldel.'</div>' .
+ '<div id="mw-diff-otitle4">' . $prevlink .'</div>';
+ $newHeader = '<div id="mw-diff-ntitle1"><strong>'.$this->mNewtitle.'</strong></div>' .
+ '<div id="mw-diff-ntitle2">' . $sk->revUserTools( $this->mNewRev, !$this->unhide ) .
+ " $rollback</div>" .
+ '<div id="mw-diff-ntitle3">' . $newminor .
+ $sk->revComment( $this->mNewRev, !$diffOnly, !$this->unhide ).$rdel.'</div>' .
+ '<div id="mw-diff-ntitle4">' . $nextlink . $patrol . '</div>';
+
+ # Check if this user can see the revisions
+ $allowed = $this->mOldRev->userCan(Revision::DELETED_TEXT)
+ && $this->mNewRev->userCan(Revision::DELETED_TEXT);
+ # Check if one of the revisions is deleted/suppressed
+ $deleted = $suppressed = false;
+ if( $this->mOldRev->isDeleted(Revision::DELETED_TEXT) ) {
+ $deleted = true; // old revisions text is hidden
+ if( $this->mOldRev->isDeleted(Revision::DELETED_RESTRICTED) )
+ $suppressed = true; // also suppressed
+ }
+ if( $this->mNewRev->isDeleted(Revision::DELETED_TEXT) ) {
+ $deleted = true; // new revisions text is hidden
+ if( $this->mNewRev->isDeleted(Revision::DELETED_RESTRICTED) )
+ $suppressed = true; // also suppressed
+ }
+ # If the diff cannot be shown due to a deleted revision, then output
+ # the diff header and links to unhide (if available)...
+ if( $deleted && (!$this->unhide || !$allowed) ) {
+ $this->showDiffStyle();
+ $multi = $this->getMultiNotice();
+ $wgOut->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
+ if( !$allowed ) {
+ $msg = $suppressed ? 'rev-suppressed-no-diff' : 'rev-deleted-no-diff';
+ # Give explanation for why revision is not visible
+ $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
+ array( $msg ) );
+ } else {
+ # Give explanation and add a link to view the diff...
+ $link = $this->mTitle->getFullUrl( array(
+ 'diff' => $this->mNewid,
+ 'oldid' => $this->mOldid,
+ 'unhide' => 1
+ ) );
+ $msg = $suppressed ? 'rev-suppressed-unhide-diff' : 'rev-deleted-unhide-diff';
+ $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", array( $msg, $link ) );
+ }
+ # Otherwise, output a regular diff...
+ } else {
+ # Add deletion notice if the user is viewing deleted content
+ $notice = '';
+ if( $deleted ) {
+ $msg = $suppressed ? 'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
+ $notice = "<div class='mw-warning plainlinks'>\n".wfMsgExt($msg,'parseinline')."</div>\n";
+ }
+ $this->showDiff( $oldHeader, $newHeader, $notice );
+ if( !$diffOnly ) {
+ $this->renderNewRevision();
+ }
+ }
+ wfProfileOut( __METHOD__ );
+ }
+
+ protected function revisionDeleteLink( $rev ) {
+ global $wgUser;
+ $link = '';
+ $canHide = $wgUser->isAllowed( 'deleterevision' );
+ // Show del/undel link if:
+ // (a) the user can delete revisions, or
+ // (b) the user can view deleted revision *and* this one is deleted
+ if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' )) ) {
+ $sk = $wgUser->getSkin();
+ if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
+ $link = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
+ } else {
+ $query = array(
+ 'type' => 'revision',
+ 'target' => $rev->mTitle->getPrefixedDbkey(),
+ 'ids' => $rev->getId()
+ );
+ $link = $sk->revDeleteLink( $query,
+ $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
+ }
+ $link = ' ' . $link . ' ';
+ }
+ return $link;
+ }
+
+ /**
+ * Show the new revision of the page.
+ */
+ function renderNewRevision() {
+ global $wgOut, $wgUser;
+ wfProfileIn( __METHOD__ );
+
+ $wgOut->addHTML( "<hr /><h2>{$this->mPagetitle}</h2>\n" );
+ # Add deleted rev tag if needed
+ if( !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
+ $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-permission' );
+ } else if( $this->mNewRev->isDeleted(Revision::DELETED_TEXT) ) {
+ $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-view' );
+ }
+
+ if( !$this->mNewRev->isCurrent() ) {
+ $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
+ }
+
+ $this->loadNewText();
+ if( is_object( $this->mNewRev ) ) {
+ $wgOut->setRevisionId( $this->mNewRev->getId() );
+ }
+
+ if( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
+ // Stolen from Article::view --AG 2007-10-11
+ // Give hooks a chance to customise the output
+ if( wfRunHooks( 'ShowRawCssJs', array( $this->mNewtext, $this->mTitle, $wgOut ) ) ) {
+ // Wrap the whole lot in a <pre> and don't parse
+ $m = array();
+ preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
+ $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
+ $wgOut->addHTML( htmlspecialchars( $this->mNewtext ) );
+ $wgOut->addHTML( "\n</pre>\n" );
+ }
+ } else {
+ $wgOut->addWikiTextTidy( $this->mNewtext );
+ }
+
+ if( is_object( $this->mNewRev ) && !$this->mNewRev->isCurrent() ) {
+ $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
+ }
+ # Add redundant patrol link on bottom...
+ if( $this->mRcidMarkPatrolled && $this->mTitle->quickUserCan('patrol') ) {
+ $sk = $wgUser->getSkin();
+ $wgOut->addHTML(
+ "<div class='patrollink'>[" . $sk->link(
+ $this->mTitle,
+ wfMsgHtml( 'markaspatrolleddiff' ),
+ array(),
+ array(
+ 'action' => 'markpatrolled',
+ 'rcid' => $this->mRcidMarkPatrolled
+ )
+ ) . ']</div>'
+ );
+ }
+
+ wfProfileOut( __METHOD__ );
+ }
+
+ /**
+ * Show the first revision of an article. Uses normal diff headers in
+ * contrast to normal "old revision" display style.
+ */
+ function showFirstRevision() {
+ global $wgOut, $wgUser;
+ wfProfileIn( __METHOD__ );
+
+ # Get article text from the DB
+ #
+ if ( ! $this->loadNewText() ) {
+ $t = $this->mTitle->getPrefixedText();
+ $d = wfMsgExt( 'missingarticle-diff', array( 'escape' ), $this->mOldid, $this->mNewid );
+ $wgOut->setPagetitle( wfMsg( 'errorpagetitle' ) );
+ $wgOut->addWikiMsg( 'missing-article', "<nowiki>$t</nowiki>", $d );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ if ( $this->mNewRev->isCurrent() ) {
+ $wgOut->setArticleFlag( true );
+ }
+
+ # Check if user is allowed to look at this page. If not, bail out.
+ #
+ if ( !$this->mTitle->userCanRead() ) {
+ $wgOut->loginToUse();
+ $wgOut->output();
+ wfProfileOut( __METHOD__ );
+ throw new MWException("Permission Error: you do not have access to view this page");
+ }
+
+ # Prepare the header box
+ #
+ $sk = $wgUser->getSkin();
+
+ $next = $this->mTitle->getNextRevisionID( $this->mNewid );
+ if( !$next ) {
+ $nextlink = '';
+ } else {
+ $nextlink = '<br />' . $sk->link(
+ $this->mTitle,
+ wfMsgHtml( 'nextdiff' ),
+ array(
+ 'id' => 'differences-nextlink'
+ ),
+ array(
+ 'diff' => 'next',
+ 'oldid' => $this->mNewid,
+ ),
+ array(
+ 'known',
+ 'noclasses'
+ )
+ );
+ }
+ $header = "<div class=\"firstrevisionheader\" style=\"text-align: center\">" .
+ $sk->revUserTools( $this->mNewRev ) . "<br />" . $sk->revComment( $this->mNewRev ) . $nextlink . "</div>\n";
+
+ $wgOut->addHTML( $header );
+
+ $wgOut->setSubtitle( wfMsgExt( 'difference', array( 'parseinline' ) ) );
+ $wgOut->setRobotPolicy( 'noindex,nofollow' );
+
+ wfProfileOut( __METHOD__ );
+ }
+
+ /**
+ * Get the diff text, send it to $wgOut
+ * Returns false if the diff could not be generated, otherwise returns true
+ */
+ function showDiff( $otitle, $ntitle, $notice = '' ) {
+ global $wgOut;
+ $diff = $this->getDiff( $otitle, $ntitle, $notice );
+ if ( $diff === false ) {
+ $wgOut->addWikiMsg( 'missing-article', "<nowiki>(fixme, bug)</nowiki>", '' );
+ return false;
+ } else {
+ $this->showDiffStyle();
+ $wgOut->addHTML( $diff );
+ return true;
+ }
+ }
+
+ /**
+ * Add style sheets and supporting JS for diff display.
+ */
+ function showDiffStyle() {
+ global $wgStylePath, $wgStyleVersion, $wgOut;
+ $wgOut->addStyle( 'common/diff.css' );
+
+ // JS is needed to detect old versions of Mozilla to work around an annoyance bug.
+ $wgOut->addScript( "<script type=\"text/javascript\" src=\"$wgStylePath/common/diff.js?$wgStyleVersion\"></script>" );
+ }
+
+ /**
+ * Get complete diff table, including header
+ *
+ * @param Title $otitle Old title
+ * @param Title $ntitle New title
+ * @param string $notice HTML between diff header and body
+ * @return mixed
+ */
+ function getDiff( $otitle, $ntitle, $notice = '' ) {
+ $body = $this->getDiffBody();
+ if ( $body === false ) {
+ return false;
+ } else {
+ $multi = $this->getMultiNotice();
+ return $this->addHeader( $body, $otitle, $ntitle, $multi, $notice );
+ }
+ }
+
+ /**
+ * Get the diff table body, without header
+ *
+ * @return mixed
+ */
+ function getDiffBody() {
+ global $wgMemc;
+ wfProfileIn( __METHOD__ );
+ $this->mCacheHit = true;
+ // Check if the diff should be hidden from this user
+ if ( !$this->loadRevisionData() )
+ return '';
+ if ( $this->mOldRev && !$this->mOldRev->userCan(Revision::DELETED_TEXT) ) {
+ return '';
+ } else if ( $this->mNewRev && !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
+ return '';
+ } else if ( $this->mOldRev && $this->mNewRev && $this->mOldRev->getID() == $this->mNewRev->getID() ) {
+ return '';
+ }
+ // Cacheable?
+ $key = false;
+ if ( $this->mOldid && $this->mNewid ) {
+ $key = wfMemcKey( 'diff', 'version', MW_DIFF_VERSION, 'oldid', $this->mOldid, 'newid', $this->mNewid );
+ // Try cache
+ if ( !$this->mRefreshCache ) {
+ $difftext = $wgMemc->get( $key );
+ if ( $difftext ) {
+ wfIncrStats( 'diff_cache_hit' );
+ $difftext = $this->localiseLineNumbers( $difftext );
+ $difftext .= "\n<!-- diff cache key $key -->\n";
+ wfProfileOut( __METHOD__ );
+ return $difftext;
+ }
+ } // don't try to load but save the result
+ }
+ $this->mCacheHit = false;
+
+ // Loadtext is permission safe, this just clears out the diff
+ if ( !$this->loadText() ) {
+ wfProfileOut( __METHOD__ );
+ return false;
+ }
+
+ $difftext = $this->generateDiffBody( $this->mOldtext, $this->mNewtext );
+
+ // Save to cache for 7 days
+ if ( !wfRunHooks( 'AbortDiffCache', array( &$this ) ) ) {
+ wfIncrStats( 'diff_uncacheable' );
+ } else if ( $key !== false && $difftext !== false ) {
+ wfIncrStats( 'diff_cache_miss' );
+ $wgMemc->set( $key, $difftext, 7*86400 );
+ } else {
+ wfIncrStats( 'diff_uncacheable' );
+ }
+ // Replace line numbers with the text in the user's language
+ if ( $difftext !== false ) {
+ $difftext = $this->localiseLineNumbers( $difftext );
+ }
+ wfProfileOut( __METHOD__ );
+ return $difftext;
+ }
+
+ /**
+ * Make sure the proper modules are loaded before we try to
+ * make the diff
+ */
+ private function initDiffEngines() {
+ global $wgExternalDiffEngine;
+ if ( $wgExternalDiffEngine == 'wikidiff' && !function_exists( 'wikidiff_do_diff' ) ) {
+ wfProfileIn( __METHOD__ . '-php_wikidiff.so' );
+ wfSuppressWarnings();
+ dl( 'php_wikidiff.so' );
+ wfRestoreWarnings();
+ wfProfileOut( __METHOD__ . '-php_wikidiff.so' );
+ }
+ else if ( $wgExternalDiffEngine == 'wikidiff2' && !function_exists( 'wikidiff2_do_diff' ) ) {
+ wfProfileIn( __METHOD__ . '-php_wikidiff2.so' );
+ wfSuppressWarnings();
+ dl( 'php_wikidiff2.so' );
+ wfRestoreWarnings();
+ wfProfileOut( __METHOD__ . '-php_wikidiff2.so' );
+ }
+ }
+
+ /**
+ * Generate a diff, no caching
+ * $otext and $ntext must be already segmented
+ */
+ function generateDiffBody( $otext, $ntext ) {
+ global $wgExternalDiffEngine, $wgContLang;
+
+ $otext = str_replace( "\r\n", "\n", $otext );
+ $ntext = str_replace( "\r\n", "\n", $ntext );
+
+ $this->initDiffEngines();
+
+ if ( $wgExternalDiffEngine == 'wikidiff' && function_exists( 'wikidiff_do_diff' ) ) {
+ # For historical reasons, external diff engine expects
+ # input text to be HTML-escaped already
+ $otext = htmlspecialchars ( $wgContLang->segmentForDiff( $otext ) );
+ $ntext = htmlspecialchars ( $wgContLang->segmentForDiff( $ntext ) );
+ return $wgContLang->unsegementForDiff( wikidiff_do_diff( $otext, $ntext, 2 ) ) .
+ $this->debug( 'wikidiff1' );
+ }
+
+ if ( $wgExternalDiffEngine == 'wikidiff2' && function_exists( 'wikidiff2_do_diff' ) ) {
+ # Better external diff engine, the 2 may some day be dropped
+ # This one does the escaping and segmenting itself
+ wfProfileIn( 'wikidiff2_do_diff' );
+ $text = wikidiff2_do_diff( $otext, $ntext, 2 );
+ $text .= $this->debug( 'wikidiff2' );
+ wfProfileOut( 'wikidiff2_do_diff' );
+ return $text;
+ }
+ if ( $wgExternalDiffEngine != 'wikidiff3' && $wgExternalDiffEngine !== false ) {
+ # Diff via the shell
+ global $wgTmpDirectory;
+ $tempName1 = tempnam( $wgTmpDirectory, 'diff_' );
+ $tempName2 = tempnam( $wgTmpDirectory, 'diff_' );
+
+ $tempFile1 = fopen( $tempName1, "w" );
+ if ( !$tempFile1 ) {
+ wfProfileOut( __METHOD__ );
+ return false;
+ }
+ $tempFile2 = fopen( $tempName2, "w" );
+ if ( !$tempFile2 ) {
+ wfProfileOut( __METHOD__ );
+ return false;
+ }
+ fwrite( $tempFile1, $otext );
+ fwrite( $tempFile2, $ntext );
+ fclose( $tempFile1 );
+ fclose( $tempFile2 );
+ $cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
+ wfProfileIn( __METHOD__ . "-shellexec" );
+ $difftext = wfShellExec( $cmd );
+ $difftext .= $this->debug( "external $wgExternalDiffEngine" );
+ wfProfileOut( __METHOD__ . "-shellexec" );
+ unlink( $tempName1 );
+ unlink( $tempName2 );
+ return $difftext;
+ }
+
+ # Native PHP diff
+ $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
+ $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
+ $diffs = new Diff( $ota, $nta );
+ $formatter = new TableDiffFormatter();
+ return $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) ) .
+ $this->debug();
+ }
+
+ /**
+ * Generate a debug comment indicating diff generating time,
+ * server node, and generator backend.
+ */
+ protected function debug( $generator="internal" ) {
+ global $wgShowHostnames;
+ if ( !$this->enableDebugComment ) {
+ return '';
+ }
+ $data = array( $generator );
+ if( $wgShowHostnames ) {
+ $data[] = wfHostname();
+ }
+ $data[] = wfTimestamp( TS_DB );
+ return "<!-- diff generator: " .
+ implode( " ",
+ array_map(
+ "htmlspecialchars",
+ $data ) ) .
+ " -->\n";
+ }
+
+ /**
+ * Replace line numbers with the text in the user's language
+ */
+ function localiseLineNumbers( $text ) {
+ return preg_replace_callback( '/<!--LINE (\d+)-->/',
+ array( &$this, 'localiseLineNumbersCb' ), $text );
+ }
+
+ function localiseLineNumbersCb( $matches ) {
+ global $wgLang;
+ if ( $matches[1] === '1' && $this->mReducedLineNumbers ) return '';
+ return wfMsgExt( 'lineno', 'escape', $wgLang->formatNum( $matches[1] ) );
+ }
+
+
+ /**
+ * If there are revisions between the ones being compared, return a note saying so.
+ */
+ function getMultiNotice() {
+ if ( !is_object($this->mOldRev) || !is_object($this->mNewRev) )
+ return '';
+
+ if( !$this->mOldPage->equals( $this->mNewPage ) ) {
+ // Comparing two different pages? Count would be meaningless.
+ return '';
+ }
+
+ $oldid = $this->mOldRev->getId();
+ $newid = $this->mNewRev->getId();
+ if ( $oldid > $newid ) {
+ $tmp = $oldid; $oldid = $newid; $newid = $tmp;
+ }
+
+ $n = $this->mTitle->countRevisionsBetween( $oldid, $newid );
+ if ( !$n )
+ return '';
+
+ return wfMsgExt( 'diff-multi', array( 'parseinline' ), $n );
+ }
+
+
+ /**
+ * Add the header to a diff body
+ */
+ static function addHeader( $diff, $otitle, $ntitle, $multi = '', $notice = '' ) {
+ $header = "<table class='diff'>";
+ if( $diff ) { // Safari/Chrome show broken output if cols not used
+ $header .= "
+ <col class='diff-marker' />
+ <col class='diff-content' />
+ <col class='diff-marker' />
+ <col class='diff-content' />";
+ $colspan = 2;
+ $multiColspan = 4;
+ } else {
+ $colspan = 1;
+ $multiColspan = 2;
+ }
+ $header .= "
+ <tr valign='top'>
+ <td colspan='$colspan' class='diff-otitle'>{$otitle}</td>
+ <td colspan='$colspan' class='diff-ntitle'>{$ntitle}</td>
+ </tr>";
+
+ if ( $multi != '' ) {
+ $header .= "<tr><td colspan='{$multiColspan}' align='center' class='diff-multi'>{$multi}</td></tr>";
+ }
+ if ( $notice != '' ) {
+ $header .= "<tr><td colspan='{$multiColspan}' align='center'>{$notice}</td></tr>";
+ }
+
+ return $header . $diff . "</table>";
+ }
+
+ /**
+ * Use specified text instead of loading from the database
+ */
+ function setText( $oldText, $newText ) {
+ $this->mOldtext = $oldText;
+ $this->mNewtext = $newText;
+ $this->mTextLoaded = 2;
+ $this->mRevisionsLoaded = true;
+ }
+
+ /**
+ * Load revision metadata for the specified articles. If newid is 0, then compare
+ * the old article in oldid to the current article; if oldid is 0, then
+ * compare the current article to the immediately previous one (ignoring the
+ * value of newid).
+ *
+ * If oldid is false, leave the corresponding revision object set
+ * to false. This is impossible via ordinary user input, and is provided for
+ * API convenience.
+ */
+ function loadRevisionData() {
+ global $wgLang, $wgUser;
+ if ( $this->mRevisionsLoaded ) {
+ return true;
+ } else {
+ // Whether it succeeds or fails, we don't want to try again
+ $this->mRevisionsLoaded = true;
+ }
+
+ // Load the new revision object
+ $this->mNewRev = $this->mNewid
+ ? Revision::newFromId( $this->mNewid )
+ : Revision::newFromTitle( $this->mTitle );
+ if( !$this->mNewRev instanceof Revision )
+ return false;
+
+ // Update the new revision ID in case it was 0 (makes life easier doing UI stuff)
+ $this->mNewid = $this->mNewRev->getId();
+
+ // Check if page is editable
+ $editable = $this->mNewRev->getTitle()->userCan( 'edit' );
+
+ // Set assorted variables
+ $timestamp = $wgLang->timeanddate( $this->mNewRev->getTimestamp(), true );
+ $dateofrev = $wgLang->date( $this->mNewRev->getTimestamp(), true );
+ $timeofrev = $wgLang->time( $this->mNewRev->getTimestamp(), true );
+ $this->mNewPage = $this->mNewRev->getTitle();
+ if( $this->mNewRev->isCurrent() ) {
+ $newLink = $this->mNewPage->escapeLocalUrl( array(
+ 'oldid' => $this->mNewid
+ ) );
+ $this->mPagetitle = htmlspecialchars( wfMsg(
+ 'currentrev-asof',
+ $timestamp,
+ $dateofrev,
+ $timeofrev
+ ) );
+ $newEdit = $this->mNewPage->escapeLocalUrl( array(
+ 'action' => 'edit'
+ ) );
+
+ $this->mNewtitle = "<a href='$newLink'>{$this->mPagetitle}</a>";
+ $this->mNewtitle .= " (<a href='$newEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
+ } else {
+ $newLink = $this->mNewPage->escapeLocalUrl( array(
+ 'oldid' => $this->mNewid
+ ) );
+ $newEdit = $this->mNewPage->escapeLocalUrl( array(
+ 'action' => 'edit',
+ 'oldid' => $this->mNewid
+ ) );
+ $this->mPagetitle = htmlspecialchars( wfMsg(
+ 'revisionasof',
+ $timestamp,
+ $dateofrev,
+ $timeofrev
+ ) );
+
+ $this->mNewtitle = "<a href='$newLink'>{$this->mPagetitle}</a>";
+ $this->mNewtitle .= " (<a href='$newEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
+ }
+ if( !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
+ $this->mNewtitle = "<span class='history-deleted'>{$this->mPagetitle}</span>";
+ } else if ( $this->mNewRev->isDeleted(Revision::DELETED_TEXT) ) {
+ $this->mNewtitle = "<span class='history-deleted'>{$this->mNewtitle}</span>";
+ }
+
+ // Load the old revision object
+ $this->mOldRev = false;
+ if( $this->mOldid ) {
+ $this->mOldRev = Revision::newFromId( $this->mOldid );
+ } elseif ( $this->mOldid === 0 ) {
+ $rev = $this->mNewRev->getPrevious();
+ if( $rev ) {
+ $this->mOldid = $rev->getId();
+ $this->mOldRev = $rev;
+ } else {
+ // No previous revision; mark to show as first-version only.
+ $this->mOldid = false;
+ $this->mOldRev = false;
+ }
+ }/* elseif ( $this->mOldid === false ) leave mOldRev false; */
+
+ if( is_null( $this->mOldRev ) ) {
+ return false;
+ }
+
+ if ( $this->mOldRev ) {
+ $this->mOldPage = $this->mOldRev->getTitle();
+
+ $t = $wgLang->timeanddate( $this->mOldRev->getTimestamp(), true );
+ $dateofrev = $wgLang->date( $this->mOldRev->getTimestamp(), true );
+ $timeofrev = $wgLang->time( $this->mOldRev->getTimestamp(), true );
+ $oldLink = $this->mOldPage->escapeLocalUrl( array(
+ 'oldid' => $this->mOldid
+ ) );
+ $oldEdit = $this->mOldPage->escapeLocalUrl( array(
+ 'action' => 'edit',
+ 'oldid' => $this->mOldid
+ ) );
+ $this->mOldPagetitle = htmlspecialchars( wfMsg( 'revisionasof', $t, $dateofrev, $timeofrev ) );
+
+ $this->mOldtitle = "<a href='$oldLink'>{$this->mOldPagetitle}</a>"
+ . " (<a href='$oldEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
+ // Add an "undo" link
+ $newUndo = $this->mNewPage->escapeLocalUrl( array(
+ 'action' => 'edit',
+ 'undoafter' => $this->mOldid,
+ 'undo' => $this->mNewid
+ ) );
+ $htmlLink = htmlspecialchars( wfMsg( 'editundo' ) );
+ $htmlTitle = $wgUser->getSkin()->tooltip( 'undo' );
+ if( $editable && !$this->mOldRev->isDeleted( Revision::DELETED_TEXT ) && !$this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
+ $this->mNewtitle .= " (<a href='$newUndo' $htmlTitle>" . $htmlLink . "</a>)";
+ }
+
+ if( !$this->mOldRev->userCan( Revision::DELETED_TEXT ) ) {
+ $this->mOldtitle = '<span class="history-deleted">' . $this->mOldPagetitle . '</span>';
+ } else if( $this->mOldRev->isDeleted( Revision::DELETED_TEXT ) ) {
+ $this->mOldtitle = '<span class="history-deleted">' . $this->mOldtitle . '</span>';
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Load the text of the revisions, as well as revision data.
+ */
+ function loadText() {
+ if ( $this->mTextLoaded == 2 ) {
+ return true;
+ } else {
+ // Whether it succeeds or fails, we don't want to try again
+ $this->mTextLoaded = 2;
+ }
+
+ if ( !$this->loadRevisionData() ) {
+ return false;
+ }
+ if ( $this->mOldRev ) {
+ $this->mOldtext = $this->mOldRev->getText( Revision::FOR_THIS_USER );
+ if ( $this->mOldtext === false ) {
+ return false;
+ }
+ }
+ if ( $this->mNewRev ) {
+ $this->mNewtext = $this->mNewRev->getText( Revision::FOR_THIS_USER );
+ if ( $this->mNewtext === false ) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Load the text of the new revision, not the old one
+ */
+ function loadNewText() {
+ if ( $this->mTextLoaded >= 1 ) {
+ return true;
+ } else {
+ $this->mTextLoaded = 1;
+ }
+ if ( !$this->loadRevisionData() ) {
+ return false;
+ }
+ $this->mNewtext = $this->mNewRev->getText( Revision::FOR_THIS_USER );
+ return true;
+ }
+}
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff