3 * User interface for the difference engine.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
21 * @ingroup DifferenceEngine
24 // Deprecated, use class constant instead
25 define( 'MW_DIFF_VERSION', '1.11a' );
29 * @ingroup DifferenceEngine
31 class DifferenceEngine
extends ContextSource
{
33 * Constant to indicate diff cache compatibility.
34 * Bump this when changing the diff formatting in a way that
35 * fixes important bugs or such to force cached diff views to
38 const DIFF_VERSION
= MW_DIFF_VERSION
;
70 /** @var bool Have the revisions IDs been loaded */
71 private $mRevisionsIdsLoaded = false;
73 /** @var bool Have the revisions been loaded */
74 public $mRevisionsLoaded = false;
76 /** @var int How many text blobs have been loaded, 0, 1 or 2? */
77 public $mTextLoaded = 0;
79 /** @var bool Was the diff fetched from cache? */
80 public $mCacheHit = false;
83 * Set this to true to add debug info to the HTML output.
84 * Warning: this may cause RSS readers to spuriously mark articles as "new"
87 public $enableDebugComment = false;
89 /** @var bool If true, line X is not displayed when X is 1, for example
90 * to increase readability and conserve space with many small diffs.
92 protected $mReducedLineNumbers = false;
94 /** @var string Link to action=markpatrolled */
95 protected $mMarkPatrolledLink = null;
97 /** @var bool Show rev_deleted content if allowed */
98 protected $unhide = false;
100 /** @var bool Refresh the diff cache */
101 protected $mRefreshCache = false;
107 * @param IContextSource $context Context to use, anything else will be ignored
108 * @param int $old Old ID we want to show and diff with.
109 * @param string|int $new Either revision ID or 'prev' or 'next'. Default: 0.
110 * @param int $rcid Deprecated, no longer used!
111 * @param bool $refreshCache If set, refreshes the diff cache
112 * @param bool $unhide If set, allow viewing deleted revs
114 public function __construct( $context = null, $old = 0, $new = 0, $rcid = 0,
115 $refreshCache = false, $unhide = false
117 if ( $context instanceof IContextSource
) {
118 $this->setContext( $context );
121 wfDebug( "DifferenceEngine old '$old' new '$new' rcid '$rcid'\n" );
123 $this->mOldid
= $old;
124 $this->mNewid
= $new;
125 $this->mRefreshCache
= $refreshCache;
126 $this->unhide
= $unhide;
132 public function setReducedLineNumbers( $value = true ) {
133 $this->mReducedLineNumbers
= $value;
139 public function getDiffLang() {
140 if ( $this->mDiffLang
=== null ) {
141 # Default language in which the diff text is written.
142 $this->mDiffLang
= $this->getTitle()->getPageLanguage();
145 return $this->mDiffLang
;
151 public function wasCacheHit() {
152 return $this->mCacheHit
;
158 public function getOldid() {
159 $this->loadRevisionIds();
161 return $this->mOldid
;
167 public function getNewid() {
168 $this->loadRevisionIds();
170 return $this->mNewid
;
174 * Look up a special:Undelete link to the given deleted revision id,
175 * as a workaround for being unable to load deleted diffs in currently.
177 * @param int $id Revision ID
179 * @return mixed URL or false
181 public function deletedLink( $id ) {
182 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
183 $dbr = wfGetDB( DB_SLAVE
);
184 $row = $dbr->selectRow( 'archive', '*',
185 [ 'ar_rev_id' => $id ],
188 $rev = Revision
::newFromArchiveRow( $row );
189 $title = Title
::makeTitleSafe( $row->ar_namespace
, $row->ar_title
);
191 return SpecialPage
::getTitleFor( 'Undelete' )->getFullURL( [
192 'target' => $title->getPrefixedText(),
193 'timestamp' => $rev->getTimestamp()
202 * Build a wikitext link toward a deleted revision, if viewable.
204 * @param int $id Revision ID
206 * @return string Wikitext fragment
208 public function deletedIdMarker( $id ) {
209 $link = $this->deletedLink( $id );
211 return "[$link $id]";
217 private function showMissingRevision() {
218 $out = $this->getOutput();
221 if ( $this->mOldRev
=== null ||
222 ( $this->mOldRev
&& $this->mOldContent
=== null )
224 $missing[] = $this->deletedIdMarker( $this->mOldid
);
226 if ( $this->mNewRev
=== null ||
227 ( $this->mNewRev
&& $this->mNewContent
=== null )
229 $missing[] = $this->deletedIdMarker( $this->mNewid
);
232 $out->setPageTitle( $this->msg( 'errorpagetitle' ) );
233 $msg = $this->msg( 'difference-missing-revision' )
234 ->params( $this->getLanguage()->listToText( $missing ) )
235 ->numParams( count( $missing ) )
237 $out->addHTML( $msg );
240 public function showDiffPage( $diffOnly = false ) {
242 # Allow frames except in certain special cases
243 $out = $this->getOutput();
244 $out->allowClickjacking();
245 $out->setRobotPolicy( 'noindex,nofollow' );
247 if ( !$this->loadRevisionData() ) {
248 $this->showMissingRevision();
253 $user = $this->getUser();
254 $permErrors = $this->mNewPage
->getUserPermissionsErrors( 'read', $user );
255 if ( $this->mOldPage
) { # mOldPage might not be set, see below.
256 $permErrors = wfMergeErrorArrays( $permErrors,
257 $this->mOldPage
->getUserPermissionsErrors( 'read', $user ) );
259 if ( count( $permErrors ) ) {
260 throw new PermissionsError( 'read', $permErrors );
266 # Carry over 'diffonly' param via navigation links
267 if ( $diffOnly != $user->getBoolOption( 'diffonly' ) ) {
268 $query['diffonly'] = $diffOnly;
270 # Cascade unhide param in links for easy deletion browsing
271 if ( $this->unhide
) {
272 $query['unhide'] = 1;
275 # Check if one of the revisions is deleted/suppressed
276 $deleted = $suppressed = false;
277 $allowed = $this->mNewRev
->userCan( Revision
::DELETED_TEXT
, $user );
281 # mOldRev is false if the difference engine is called with a "vague" query for
282 # a diff between a version V and its previous version V' AND the version V
283 # is the first version of that article. In that case, V' does not exist.
284 if ( $this->mOldRev
=== false ) {
285 $out->setPageTitle( $this->msg( 'difference-title', $this->mNewPage
->getPrefixedText() ) );
289 Hooks
::run( 'DiffViewHeader', [ $this, $this->mOldRev
, $this->mNewRev
] );
291 if ( $this->mNewPage
->equals( $this->mOldPage
) ) {
292 $out->setPageTitle( $this->msg( 'difference-title', $this->mNewPage
->getPrefixedText() ) );
295 $out->setPageTitle( $this->msg( 'difference-title-multipage',
296 $this->mOldPage
->getPrefixedText(), $this->mNewPage
->getPrefixedText() ) );
297 $out->addSubtitle( $this->msg( 'difference-multipage' ) );
301 if ( $samePage && $this->mNewPage
->quickUserCan( 'edit', $user ) ) {
302 if ( $this->mNewRev
->isCurrent() && $this->mNewPage
->userCan( 'rollback', $user ) ) {
303 $rollbackLink = Linker
::generateRollback( $this->mNewRev
, $this->getContext() );
304 if ( $rollbackLink ) {
305 $out->preventClickjacking();
306 $rollback = '   ' . $rollbackLink;
310 if ( !$this->mOldRev
->isDeleted( Revision
::DELETED_TEXT
) &&
311 !$this->mNewRev
->isDeleted( Revision
::DELETED_TEXT
)
313 $undoLink = Html
::element( 'a', [
314 'href' => $this->mNewPage
->getLocalURL( [
316 'undoafter' => $this->mOldid
,
317 'undo' => $this->mNewid
319 'title' => Linker
::titleAttrib( 'undo' ),
321 $this->msg( 'editundo' )->text()
323 $revisionTools['mw-diff-undo'] = $undoLink;
327 # Make "previous revision link"
328 if ( $samePage && $this->mOldRev
->getPrevious() ) {
329 $prevlink = Linker
::linkKnown(
331 $this->msg( 'previousdiff' )->escaped(),
332 [ 'id' => 'differences-prevlink' ],
333 [ 'diff' => 'prev', 'oldid' => $this->mOldid
] +
$query
336 $prevlink = ' ';
339 if ( $this->mOldRev
->isMinor() ) {
340 $oldminor = ChangesList
::flag( 'minor' );
345 $ldel = $this->revisionDeleteLink( $this->mOldRev
);
346 $oldRevisionHeader = $this->getRevisionHeader( $this->mOldRev
, 'complete' );
347 $oldChangeTags = ChangeTags
::formatSummaryRow( $this->mOldTags
, 'diff', $this->getContext() );
349 $oldHeader = '<div id="mw-diff-otitle1"><strong>' . $oldRevisionHeader . '</strong></div>' .
350 '<div id="mw-diff-otitle2">' .
351 Linker
::revUserTools( $this->mOldRev
, !$this->unhide
) . '</div>' .
352 '<div id="mw-diff-otitle3">' . $oldminor .
353 Linker
::revComment( $this->mOldRev
, !$diffOnly, !$this->unhide
) . $ldel . '</div>' .
354 '<div id="mw-diff-otitle5">' . $oldChangeTags[0] . '</div>' .
355 '<div id="mw-diff-otitle4">' . $prevlink . '</div>';
357 if ( $this->mOldRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
358 $deleted = true; // old revisions text is hidden
359 if ( $this->mOldRev
->isDeleted( Revision
::DELETED_RESTRICTED
) ) {
360 $suppressed = true; // also suppressed
364 # Check if this user can see the revisions
365 if ( !$this->mOldRev
->userCan( Revision
::DELETED_TEXT
, $user ) ) {
370 # Make "next revision link"
371 # Skip next link on the top revision
372 if ( $samePage && !$this->mNewRev
->isCurrent() ) {
373 $nextlink = Linker
::linkKnown(
375 $this->msg( 'nextdiff' )->escaped(),
376 [ 'id' => 'differences-nextlink' ],
377 [ 'diff' => 'next', 'oldid' => $this->mNewid
] +
$query
380 $nextlink = ' ';
383 if ( $this->mNewRev
->isMinor() ) {
384 $newminor = ChangesList
::flag( 'minor' );
389 # Handle RevisionDelete links...
390 $rdel = $this->revisionDeleteLink( $this->mNewRev
);
392 # Allow extensions to define their own revision tools
393 Hooks
::run( 'DiffRevisionTools',
394 [ $this->mNewRev
, &$revisionTools, $this->mOldRev
, $user ] );
395 $formattedRevisionTools = [];
396 // Put each one in parentheses (poor man's button)
397 foreach ( $revisionTools as $key => $tool ) {
398 $toolClass = is_string( $key ) ?
$key : 'mw-diff-tool';
399 $element = Html
::rawElement(
401 [ 'class' => $toolClass ],
402 $this->msg( 'parentheses' )->rawParams( $tool )->escaped()
404 $formattedRevisionTools[] = $element;
406 $newRevisionHeader = $this->getRevisionHeader( $this->mNewRev
, 'complete' ) .
407 ' ' . implode( ' ', $formattedRevisionTools );
408 $newChangeTags = ChangeTags
::formatSummaryRow( $this->mNewTags
, 'diff', $this->getContext() );
410 $newHeader = '<div id="mw-diff-ntitle1"><strong>' . $newRevisionHeader . '</strong></div>' .
411 '<div id="mw-diff-ntitle2">' . Linker
::revUserTools( $this->mNewRev
, !$this->unhide
) .
413 '<div id="mw-diff-ntitle3">' . $newminor .
414 Linker
::revComment( $this->mNewRev
, !$diffOnly, !$this->unhide
) . $rdel . '</div>' .
415 '<div id="mw-diff-ntitle5">' . $newChangeTags[0] . '</div>' .
416 '<div id="mw-diff-ntitle4">' . $nextlink . $this->markPatrolledLink() . '</div>';
418 if ( $this->mNewRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
419 $deleted = true; // new revisions text is hidden
420 if ( $this->mNewRev
->isDeleted( Revision
::DELETED_RESTRICTED
) ) {
421 $suppressed = true; // also suppressed
425 # If the diff cannot be shown due to a deleted revision, then output
426 # the diff header and links to unhide (if available)...
427 if ( $deleted && ( !$this->unhide ||
!$allowed ) ) {
428 $this->showDiffStyle();
429 $multi = $this->getMultiNotice();
430 $out->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
432 $msg = $suppressed ?
'rev-suppressed-no-diff' : 'rev-deleted-no-diff';
433 # Give explanation for why revision is not visible
434 $out->wrapWikiMsg( "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n",
437 # Give explanation and add a link to view the diff...
438 $query = $this->getRequest()->appendQueryValue( 'unhide', '1' );
439 $link = $this->getTitle()->getFullURL( $query );
440 $msg = $suppressed ?
'rev-suppressed-unhide-diff' : 'rev-deleted-unhide-diff';
442 "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n",
446 # Otherwise, output a regular diff...
448 # Add deletion notice if the user is viewing deleted content
451 $msg = $suppressed ?
'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
452 $notice = "<div id='mw-$msg' class='mw-warning plainlinks'>\n" .
453 $this->msg( $msg )->parse() .
456 $this->showDiff( $oldHeader, $newHeader, $notice );
458 $this->renderNewRevision();
464 * Build a link to mark a change as patrolled.
466 * Returns empty string if there's either no revision to patrol or the user is not allowed to.
467 * Side effect: When the patrol link is build, this method will call
468 * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
470 * @return string HTML or empty string
472 protected function markPatrolledLink() {
473 if ( $this->mMarkPatrolledLink
=== null ) {
474 $linkInfo = $this->getMarkPatrolledLinkInfo();
475 // If false, there is no patrol link needed/allowed
477 $this->mMarkPatrolledLink
= '';
479 $this->mMarkPatrolledLink
= ' <span class="patrollink" data-mw="interface">[' .
482 $this->msg( 'markaspatrolleddiff' )->escaped(),
485 'action' => 'markpatrolled',
486 'rcid' => $linkInfo['rcid'],
487 'token' => $linkInfo['token'],
492 return $this->mMarkPatrolledLink
;
496 * Returns an array of meta data needed to build a "mark as patrolled" link and
497 * adds the mediawiki.page.patrol.ajax to the output.
499 * @return array|false An array of meta data for a patrol link (rcid & token)
500 * or false if no link is needed
502 protected function getMarkPatrolledLinkInfo() {
503 global $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
505 $user = $this->getUser();
507 // Prepare a change patrol link, if applicable
509 // Is patrolling enabled and the user allowed to?
510 $wgUseRCPatrol && $this->mNewPage
->quickUserCan( 'patrol', $user ) &&
511 // Only do this if the revision isn't more than 6 hours older
512 // than the Max RC age (6h because the RC might not be cleaned out regularly)
513 RecentChange
::isInRCLifespan( $this->mNewRev
->getTimestamp(), 21600 )
515 // Look for an unpatrolled change corresponding to this diff
516 $db = wfGetDB( DB_SLAVE
);
517 $change = RecentChange
::newFromConds(
519 'rc_timestamp' => $db->timestamp( $this->mNewRev
->getTimestamp() ),
520 'rc_this_oldid' => $this->mNewid
,
526 if ( $change && !$change->getPerformer()->equals( $user ) ) {
527 $rcid = $change->getAttribute( 'rc_id' );
529 // None found or the page has been created by the current user.
530 // If the user could patrol this it already would be patrolled
535 $this->getOutput()->preventClickjacking();
536 if ( $wgEnableAPI && $wgEnableWriteAPI
537 && $user->isAllowed( 'writeapi' )
539 $this->getOutput()->addModules( 'mediawiki.page.patrol.ajax' );
542 $token = $user->getEditToken( $rcid );
550 // No mark as patrolled link applicable
555 * @param Revision $rev
559 protected function revisionDeleteLink( $rev ) {
560 $link = Linker
::getRevDeleteLink( $this->getUser(), $rev, $rev->getTitle() );
561 if ( $link !== '' ) {
562 $link = '   ' . $link . ' ';
569 * Show the new revision of the page.
571 public function renderNewRevision() {
572 $out = $this->getOutput();
573 $revHeader = $this->getRevisionHeader( $this->mNewRev
);
574 # Add "current version as of X" title
575 $out->addHTML( "<hr class='diff-hr' id='mw-oldid' />
576 <h2 class='diff-currentversion-title'>{$revHeader}</h2>\n" );
577 # Page content may be handled by a hooked call instead...
578 # @codingStandardsIgnoreStart Ignoring long lines.
579 if ( Hooks
::run( 'ArticleContentOnDiff', [ $this, $out ] ) ) {
580 $this->loadNewText();
581 $out->setRevisionId( $this->mNewid
);
582 $out->setRevisionTimestamp( $this->mNewRev
->getTimestamp() );
583 $out->setArticleFlag( true );
585 // NOTE: only needed for B/C: custom rendering of JS/CSS via hook
586 if ( $this->mNewPage
->isCssJsSubpage() ||
$this->mNewPage
->isCssOrJsPage() ) {
587 // This needs to be synchronised with Article::showCssOrJsPage(), which sucks
588 // Give hooks a chance to customise the output
589 // @todo standardize this crap into one function
590 if ( ContentHandler
::runLegacyHooks( 'ShowRawCssJs', [ $this->mNewContent
, $this->mNewPage
, $out ] ) ) {
591 // NOTE: deprecated hook, B/C only
592 // use the content object's own rendering
593 $cnt = $this->mNewRev
->getContent();
594 $po = $cnt ?
$cnt->getParserOutput( $this->mNewRev
->getTitle(), $this->mNewRev
->getId() ) : null;
596 $out->addParserOutputContent( $po );
599 } elseif ( !Hooks
::run( 'ArticleContentViewCustom', [ $this->mNewContent
, $this->mNewPage
, $out ] ) ) {
600 // Handled by extension
601 } elseif ( !ContentHandler
::runLegacyHooks( 'ArticleViewCustom', [ $this->mNewContent
, $this->mNewPage
, $out ] ) ) {
602 // NOTE: deprecated hook, B/C only
603 // Handled by extension
606 if ( $this->getTitle()->equals( $this->mNewPage
) ) {
607 // If the Title stored in the context is the same as the one
608 // of the new revision, we can use its associated WikiPage
610 $wikiPage = $this->getWikiPage();
612 // Otherwise we need to create our own WikiPage object
613 $wikiPage = WikiPage
::factory( $this->mNewPage
);
616 $parserOutput = $this->getParserOutput( $wikiPage, $this->mNewRev
);
618 # WikiPage::getParserOutput() should not return false, but just in case
619 if ( $parserOutput ) {
620 $out->addParserOutput( $parserOutput );
624 # @codingStandardsIgnoreEnd
626 # Add redundant patrol link on bottom...
627 $out->addHTML( $this->markPatrolledLink() );
631 protected function getParserOutput( WikiPage
$page, Revision
$rev ) {
632 $parserOptions = $page->makeParserOptions( $this->getContext() );
634 if ( !$rev->isCurrent() ||
!$rev->getTitle()->quickUserCan( 'edit', $this->getUser() ) ) {
635 $parserOptions->setEditSection( false );
638 $parserOutput = $page->getParserOutput( $parserOptions, $rev->getId() );
640 return $parserOutput;
644 * Get the diff text, send it to the OutputPage object
645 * Returns false if the diff could not be generated, otherwise returns true
647 * @param string|bool $otitle Header for old text or false
648 * @param string|bool $ntitle Header for new text or false
649 * @param string $notice HTML between diff header and body
653 public function showDiff( $otitle, $ntitle, $notice = '' ) {
654 $diff = $this->getDiff( $otitle, $ntitle, $notice );
655 if ( $diff === false ) {
656 $this->showMissingRevision();
660 $this->showDiffStyle();
661 $this->getOutput()->addHTML( $diff );
668 * Add style sheets and supporting JS for diff display.
670 public function showDiffStyle() {
671 $this->getOutput()->addModuleStyles( 'mediawiki.action.history.diff' );
675 * Get complete diff table, including header
677 * @param string|bool $otitle Header for old text or false
678 * @param string|bool $ntitle Header for new text or false
679 * @param string $notice HTML between diff header and body
683 public function getDiff( $otitle, $ntitle, $notice = '' ) {
684 $body = $this->getDiffBody();
685 if ( $body === false ) {
689 $multi = $this->getMultiNotice();
690 // Display a message when the diff is empty
691 if ( $body === '' ) {
692 $notice .= '<div class="mw-diff-empty">' .
693 $this->msg( 'diff-empty' )->parse() .
697 return $this->addHeader( $body, $otitle, $ntitle, $multi, $notice );
701 * Get the diff table body, without header
703 * @return mixed (string/false)
705 public function getDiffBody() {
706 $this->mCacheHit
= true;
707 // Check if the diff should be hidden from this user
708 if ( !$this->loadRevisionData() ) {
710 } elseif ( $this->mOldRev
&&
711 !$this->mOldRev
->userCan( Revision
::DELETED_TEXT
, $this->getUser() )
714 } elseif ( $this->mNewRev
&&
715 !$this->mNewRev
->userCan( Revision
::DELETED_TEXT
, $this->getUser() )
720 if ( $this->mOldRev
=== false ||
( $this->mOldRev
&& $this->mNewRev
721 && $this->mOldRev
->getId() == $this->mNewRev
->getId() )
727 $cache = ObjectCache
::getMainWANInstance();
728 if ( $this->mOldid
&& $this->mNewid
) {
729 $key = $this->getDiffBodyCacheKey();
732 if ( !$this->mRefreshCache
) {
733 $difftext = $cache->get( $key );
735 wfIncrStats( 'diff_cache.hit' );
736 $difftext = $this->localiseLineNumbers( $difftext );
737 $difftext .= "\n<!-- diff cache key $key -->\n";
741 } // don't try to load but save the result
743 $this->mCacheHit
= false;
745 // Loadtext is permission safe, this just clears out the diff
746 if ( !$this->loadText() ) {
750 $difftext = $this->generateContentDiffBody( $this->mOldContent
, $this->mNewContent
);
752 // Save to cache for 7 days
753 if ( !Hooks
::run( 'AbortDiffCache', [ &$this ] ) ) {
754 wfIncrStats( 'diff_cache.uncacheable' );
755 } elseif ( $key !== false && $difftext !== false ) {
756 wfIncrStats( 'diff_cache.miss' );
757 $cache->set( $key, $difftext, 7 * 86400 );
759 wfIncrStats( 'diff_cache.uncacheable' );
761 // Replace line numbers with the text in the user's language
762 if ( $difftext !== false ) {
763 $difftext = $this->localiseLineNumbers( $difftext );
770 * Returns the cache key for diff body text or content.
774 * @throws MWException
777 protected function getDiffBodyCacheKey() {
778 if ( !$this->mOldid ||
!$this->mNewid
) {
779 throw new MWException( 'mOldid and mNewid must be set to get diff cache key.' );
782 return wfMemcKey( 'diff', 'version', self
::DIFF_VERSION
,
783 'oldid', $this->mOldid
, 'newid', $this->mNewid
);
787 * Generate a diff, no caching.
789 * This implementation uses generateTextDiffBody() to generate a diff based on the default
790 * serialization of the given Content objects. This will fail if $old or $new are not
791 * instances of TextContent.
793 * Subclasses may override this to provide a different rendering for the diff,
794 * perhaps taking advantage of the content's native form. This is required for all content
795 * models that are not text based.
799 * @param Content $old Old content
800 * @param Content $new New content
802 * @throws MWException If old or new content is not an instance of TextContent.
803 * @return bool|string
805 public function generateContentDiffBody( Content
$old, Content
$new ) {
806 if ( !( $old instanceof TextContent
) ) {
807 throw new MWException( "Diff not implemented for " . get_class( $old ) . "; " .
808 "override generateContentDiffBody to fix this." );
811 if ( !( $new instanceof TextContent
) ) {
812 throw new MWException( "Diff not implemented for " . get_class( $new ) . "; "
813 . "override generateContentDiffBody to fix this." );
816 $otext = $old->serialize();
817 $ntext = $new->serialize();
819 return $this->generateTextDiffBody( $otext, $ntext );
823 * Generate a diff, no caching
825 * @todo move this to TextDifferenceEngine, make DifferenceEngine abstract. At some point.
827 * @param string $otext Old text, must be already segmented
828 * @param string $ntext New text, must be already segmented
830 * @return bool|string
832 public function generateTextDiffBody( $otext, $ntext ) {
833 $diff = function() use ( $otext, $ntext ) {
834 $time = microtime( true );
836 $result = $this->textDiff( $otext, $ntext );
838 $time = intval( ( microtime( true ) - $time ) * 1000 );
839 $this->getStats()->timing( 'diff_time', $time );
840 // Log requests slower than 99th percentile
841 if ( $time > 100 && $this->mOldPage
&& $this->mNewPage
) {
843 "$time ms diff: {$this->mOldid} -> {$this->mNewid} {$this->mNewPage}" );
849 $error = function( $status ) {
850 throw new FatalError( $status->getWikiText() );
853 // Use PoolCounter if the diff looks like it can be expensive
854 if ( strlen( $otext ) +
strlen( $ntext ) > 20000 ) {
855 $work = new PoolCounterWorkViaCallback( 'diff',
856 md5( $otext ) . md5( $ntext ),
857 [ 'doWork' => $diff, 'error' => $error ]
859 return $work->execute();
866 * Generates diff, to be wrapped internally in a logging/instrumentation
868 * @param string $otext Old text, must be already segmented
869 * @param string $ntext New text, must be already segmented
870 * @return bool|string
872 protected function textDiff( $otext, $ntext ) {
873 global $wgExternalDiffEngine, $wgContLang;
875 $otext = str_replace( "\r\n", "\n", $otext );
876 $ntext = str_replace( "\r\n", "\n", $ntext );
878 if ( $wgExternalDiffEngine == 'wikidiff' ||
$wgExternalDiffEngine == 'wikidiff3' ) {
879 wfDeprecated( "\$wgExternalDiffEngine = '{$wgExternalDiffEngine}'", '1.27' );
880 $wgExternalDiffEngine = false;
881 } elseif ( $wgExternalDiffEngine == 'wikidiff2' ) {
882 // Same as above, but with no deprecation warnings
883 $wgExternalDiffEngine = false;
884 } elseif ( !is_string( $wgExternalDiffEngine ) && $wgExternalDiffEngine !== false ) {
885 // And prevent people from shooting themselves in the foot...
886 wfWarn( '$wgExternalDiffEngine is set to a non-string value, forcing it to false' );
887 $wgExternalDiffEngine = false;
890 if ( function_exists( 'wikidiff2_do_diff' ) && $wgExternalDiffEngine === false ) {
891 # Better external diff engine, the 2 may some day be dropped
892 # This one does the escaping and segmenting itself
893 $text = wikidiff2_do_diff( $otext, $ntext, 2 );
894 $text .= $this->debug( 'wikidiff2' );
897 } elseif ( $wgExternalDiffEngine !== false && is_executable( $wgExternalDiffEngine ) ) {
899 $tmpDir = wfTempDir();
900 $tempName1 = tempnam( $tmpDir, 'diff_' );
901 $tempName2 = tempnam( $tmpDir, 'diff_' );
903 $tempFile1 = fopen( $tempName1, "w" );
907 $tempFile2 = fopen( $tempName2, "w" );
911 fwrite( $tempFile1, $otext );
912 fwrite( $tempFile2, $ntext );
913 fclose( $tempFile1 );
914 fclose( $tempFile2 );
915 $cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
916 $difftext = wfShellExec( $cmd );
917 $difftext .= $this->debug( "external $wgExternalDiffEngine" );
918 unlink( $tempName1 );
919 unlink( $tempName2 );
925 $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
926 $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
927 $diffs = new Diff( $ota, $nta );
928 $formatter = new TableDiffFormatter();
929 $difftext = $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) );
935 * Generate a debug comment indicating diff generating time,
936 * server node, and generator backend.
938 * @param string $generator : What diff engine was used
942 protected function debug( $generator = "internal" ) {
943 global $wgShowHostnames;
944 if ( !$this->enableDebugComment
) {
947 $data = [ $generator ];
948 if ( $wgShowHostnames ) {
949 $data[] = wfHostname();
951 $data[] = wfTimestamp( TS_DB
);
953 return "<!-- diff generator: " .
954 implode( " ", array_map( "htmlspecialchars", $data ) ) .
959 * Replace line numbers with the text in the user's language
961 * @param string $text
965 public function localiseLineNumbers( $text ) {
966 return preg_replace_callback(
967 '/<!--LINE (\d+)-->/',
968 [ &$this, 'localiseLineNumbersCb' ],
973 public function localiseLineNumbersCb( $matches ) {
974 if ( $matches[1] === '1' && $this->mReducedLineNumbers
) {
978 return $this->msg( 'lineno' )->numParams( $matches[1] )->escaped();
982 * If there are revisions between the ones being compared, return a note saying so.
986 public function getMultiNotice() {
987 if ( !is_object( $this->mOldRev
) ||
!is_object( $this->mNewRev
) ) {
989 } elseif ( !$this->mOldPage
->equals( $this->mNewPage
) ) {
990 // Comparing two different pages? Count would be meaningless.
994 if ( $this->mOldRev
->getTimestamp() > $this->mNewRev
->getTimestamp() ) {
995 $oldRev = $this->mNewRev
; // flip
996 $newRev = $this->mOldRev
; // flip
997 } else { // normal case
998 $oldRev = $this->mOldRev
;
999 $newRev = $this->mNewRev
;
1002 // Sanity: don't show the notice if too many rows must be scanned
1003 // @todo show some special message for that case
1004 $nEdits = $this->mNewPage
->countRevisionsBetween( $oldRev, $newRev, 1000 );
1005 if ( $nEdits > 0 && $nEdits <= 1000 ) {
1006 $limit = 100; // use diff-multi-manyusers if too many users
1007 $users = $this->mNewPage
->getAuthorsBetween( $oldRev, $newRev, $limit );
1008 $numUsers = count( $users );
1010 if ( $numUsers == 1 && $users[0] == $newRev->getUserText( Revision
::RAW
) ) {
1011 $numUsers = 0; // special case to say "by the same user" instead of "by one other user"
1014 return self
::intermediateEditsMsg( $nEdits, $numUsers, $limit );
1017 return ''; // nothing
1021 * Get a notice about how many intermediate edits and users there are
1023 * @param int $numEdits
1024 * @param int $numUsers
1029 public static function intermediateEditsMsg( $numEdits, $numUsers, $limit ) {
1030 if ( $numUsers === 0 ) {
1031 $msg = 'diff-multi-sameuser';
1032 } elseif ( $numUsers > $limit ) {
1033 $msg = 'diff-multi-manyusers';
1036 $msg = 'diff-multi-otherusers';
1039 return wfMessage( $msg )->numParams( $numEdits, $numUsers )->parse();
1043 * Get a header for a specified revision.
1045 * @param Revision $rev
1046 * @param string $complete 'complete' to get the header wrapped depending
1047 * the visibility of the revision and a link to edit the page.
1049 * @return string HTML fragment
1051 protected function getRevisionHeader( Revision
$rev, $complete = '' ) {
1052 $lang = $this->getLanguage();
1053 $user = $this->getUser();
1054 $revtimestamp = $rev->getTimestamp();
1055 $timestamp = $lang->userTimeAndDate( $revtimestamp, $user );
1056 $dateofrev = $lang->userDate( $revtimestamp, $user );
1057 $timeofrev = $lang->userTime( $revtimestamp, $user );
1059 $header = $this->msg(
1060 $rev->isCurrent() ?
'currentrev-asof' : 'revisionasof',
1066 if ( $complete !== 'complete' ) {
1070 $title = $rev->getTitle();
1072 $header = Linker
::linkKnown( $title, $header, [],
1073 [ 'oldid' => $rev->getId() ] );
1075 if ( $rev->userCan( Revision
::DELETED_TEXT
, $user ) ) {
1076 $editQuery = [ 'action' => 'edit' ];
1077 if ( !$rev->isCurrent() ) {
1078 $editQuery['oldid'] = $rev->getId();
1081 $key = $title->quickUserCan( 'edit', $user ) ?
'editold' : 'viewsourceold';
1082 $msg = $this->msg( $key )->escaped();
1083 $editLink = $this->msg( 'parentheses' )->rawParams(
1084 Linker
::linkKnown( $title, $msg, [], $editQuery ) )->escaped();
1085 $header .= ' ' . Html
::rawElement(
1087 [ 'class' => 'mw-diff-edit' ],
1090 if ( $rev->isDeleted( Revision
::DELETED_TEXT
) ) {
1091 $header = Html
::rawElement(
1093 [ 'class' => 'history-deleted' ],
1098 $header = Html
::rawElement( 'span', [ 'class' => 'history-deleted' ], $header );
1105 * Add the header to a diff body
1107 * @param string $diff Diff body
1108 * @param string $otitle Old revision header
1109 * @param string $ntitle New revision header
1110 * @param string $multi Notice telling user that there are intermediate
1111 * revisions between the ones being compared
1112 * @param string $notice Other notices, e.g. that user is viewing deleted content
1116 public function addHeader( $diff, $otitle, $ntitle, $multi = '', $notice = '' ) {
1117 // shared.css sets diff in interface language/dir, but the actual content
1118 // is often in a different language, mostly the page content language/dir
1119 $header = Html
::openElement( 'table', [
1120 'class' => [ 'diff', 'diff-contentalign-' . $this->getDiffLang()->alignStart() ],
1121 'data-mw' => 'interface',
1123 $userLang = htmlspecialchars( $this->getLanguage()->getHtmlCode() );
1125 if ( !$diff && !$otitle ) {
1127 <tr style='vertical-align: top;' lang='{$userLang}'>
1128 <td class='diff-ntitle'>{$ntitle}</td>
1132 if ( $diff ) { // Safari/Chrome show broken output if cols not used
1134 <col class='diff-marker' />
1135 <col class='diff-content' />
1136 <col class='diff-marker' />
1137 <col class='diff-content' />";
1144 if ( $otitle ||
$ntitle ) {
1146 <tr style='vertical-align: top;' lang='{$userLang}'>
1147 <td colspan='$colspan' class='diff-otitle'>{$otitle}</td>
1148 <td colspan='$colspan' class='diff-ntitle'>{$ntitle}</td>
1153 if ( $multi != '' ) {
1154 $header .= "<tr><td colspan='{$multiColspan}' style='text-align: center;' " .
1155 "class='diff-multi' lang='{$userLang}'>{$multi}</td></tr>";
1157 if ( $notice != '' ) {
1158 $header .= "<tr><td colspan='{$multiColspan}' style='text-align: center;' " .
1159 "lang='{$userLang}'>{$notice}</td></tr>";
1162 return $header . $diff . "</table>";
1166 * Use specified text instead of loading from the database
1167 * @param Content $oldContent
1168 * @param Content $newContent
1171 public function setContent( Content
$oldContent, Content
$newContent ) {
1172 $this->mOldContent
= $oldContent;
1173 $this->mNewContent
= $newContent;
1175 $this->mTextLoaded
= 2;
1176 $this->mRevisionsLoaded
= true;
1180 * Set the language in which the diff text is written
1181 * (Defaults to page content language).
1182 * @param Language|string $lang
1185 public function setTextLanguage( $lang ) {
1186 $this->mDiffLang
= wfGetLangObj( $lang );
1190 * Maps a revision pair definition as accepted by DifferenceEngine constructor
1191 * to a pair of actual integers representing revision ids.
1193 * @param int $old Revision id, e.g. from URL parameter 'oldid'
1194 * @param int|string $new Revision id or strings 'next' or 'prev', e.g. from URL parameter 'diff'
1196 * @return int[] List of two revision ids, older first, later second.
1197 * Zero signifies invalid argument passed.
1198 * false signifies that there is no previous/next revision ($old is the oldest/newest one).
1200 public function mapDiffPrevNext( $old, $new ) {
1201 if ( $new === 'prev' ) {
1202 // Show diff between revision $old and the previous one. Get previous one from DB.
1203 $newid = intval( $old );
1204 $oldid = $this->getTitle()->getPreviousRevisionID( $newid );
1205 } elseif ( $new === 'next' ) {
1206 // Show diff between revision $old and the next one. Get next one from DB.
1207 $oldid = intval( $old );
1208 $newid = $this->getTitle()->getNextRevisionID( $oldid );
1210 $oldid = intval( $old );
1211 $newid = intval( $new );
1214 return [ $oldid, $newid ];
1220 private function loadRevisionIds() {
1221 if ( $this->mRevisionsIdsLoaded
) {
1225 $this->mRevisionsIdsLoaded
= true;
1227 $old = $this->mOldid
;
1228 $new = $this->mNewid
;
1230 list( $this->mOldid
, $this->mNewid
) = self
::mapDiffPrevNext( $old, $new );
1231 if ( $new === 'next' && $this->mNewid
=== false ) {
1232 # if no result, NewId points to the newest old revision. The only newer
1233 # revision is cur, which is "0".
1238 'NewDifferenceEngine',
1239 [ $this->getTitle(), &$this->mOldid
, &$this->mNewid
, $old, $new ]
1244 * Load revision metadata for the specified articles. If newid is 0, then compare
1245 * the old article in oldid to the current article; if oldid is 0, then
1246 * compare the current article to the immediately previous one (ignoring the
1249 * If oldid is false, leave the corresponding revision object set
1250 * to false. This is impossible via ordinary user input, and is provided for
1255 public function loadRevisionData() {
1256 if ( $this->mRevisionsLoaded
) {
1260 // Whether it succeeds or fails, we don't want to try again
1261 $this->mRevisionsLoaded
= true;
1263 $this->loadRevisionIds();
1265 // Load the new revision object
1266 if ( $this->mNewid
) {
1267 $this->mNewRev
= Revision
::newFromId( $this->mNewid
);
1269 $this->mNewRev
= Revision
::newFromTitle(
1272 Revision
::READ_NORMAL
1276 if ( !$this->mNewRev
instanceof Revision
) {
1280 // Update the new revision ID in case it was 0 (makes life easier doing UI stuff)
1281 $this->mNewid
= $this->mNewRev
->getId();
1282 $this->mNewPage
= $this->mNewRev
->getTitle();
1284 // Load the old revision object
1285 $this->mOldRev
= false;
1286 if ( $this->mOldid
) {
1287 $this->mOldRev
= Revision
::newFromId( $this->mOldid
);
1288 } elseif ( $this->mOldid
=== 0 ) {
1289 $rev = $this->mNewRev
->getPrevious();
1291 $this->mOldid
= $rev->getId();
1292 $this->mOldRev
= $rev;
1294 // No previous revision; mark to show as first-version only.
1295 $this->mOldid
= false;
1296 $this->mOldRev
= false;
1298 } /* elseif ( $this->mOldid === false ) leave mOldRev false; */
1300 if ( is_null( $this->mOldRev
) ) {
1304 if ( $this->mOldRev
) {
1305 $this->mOldPage
= $this->mOldRev
->getTitle();
1308 // Load tags information for both revisions
1309 $dbr = wfGetDB( DB_SLAVE
);
1310 if ( $this->mOldid
!== false ) {
1311 $this->mOldTags
= $dbr->selectField(
1314 [ 'ts_rev_id' => $this->mOldid
],
1318 $this->mOldTags
= false;
1320 $this->mNewTags
= $dbr->selectField(
1323 [ 'ts_rev_id' => $this->mNewid
],
1331 * Load the text of the revisions, as well as revision data.
1335 public function loadText() {
1336 if ( $this->mTextLoaded
== 2 ) {
1340 // Whether it succeeds or fails, we don't want to try again
1341 $this->mTextLoaded
= 2;
1343 if ( !$this->loadRevisionData() ) {
1347 if ( $this->mOldRev
) {
1348 $this->mOldContent
= $this->mOldRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );
1349 if ( $this->mOldContent
=== null ) {
1354 if ( $this->mNewRev
) {
1355 $this->mNewContent
= $this->mNewRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );
1356 if ( $this->mNewContent
=== null ) {
1365 * Load the text of the new revision, not the old one
1369 public function loadNewText() {
1370 if ( $this->mTextLoaded
>= 1 ) {
1374 $this->mTextLoaded
= 1;
1376 if ( !$this->loadRevisionData() ) {
1380 $this->mNewContent
= $this->mNewRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );