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 string|bool Link HTML or false
181 public function deletedLink( $id ) {
182 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
183 $dbr = wfGetDB( DB_REPLICA
);
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 ) {
241 # Allow frames except in certain special cases
242 $out = $this->getOutput();
243 $out->allowClickjacking();
244 $out->setRobotPolicy( 'noindex,nofollow' );
246 // Allow extensions to add any extra output here
247 Hooks
::run( 'DifferenceEngineShowDiffPage', [ $out ] );
249 if ( !$this->loadRevisionData() ) {
250 $this->showMissingRevision();
255 $user = $this->getUser();
256 $permErrors = $this->mNewPage
->getUserPermissionsErrors( 'read', $user );
257 if ( $this->mOldPage
) { # mOldPage might not be set, see below.
258 $permErrors = wfMergeErrorArrays( $permErrors,
259 $this->mOldPage
->getUserPermissionsErrors( 'read', $user ) );
261 if ( count( $permErrors ) ) {
262 throw new PermissionsError( 'read', $permErrors );
268 # Carry over 'diffonly' param via navigation links
269 if ( $diffOnly != $user->getBoolOption( 'diffonly' ) ) {
270 $query['diffonly'] = $diffOnly;
272 # Cascade unhide param in links for easy deletion browsing
273 if ( $this->unhide
) {
274 $query['unhide'] = 1;
277 # Check if one of the revisions is deleted/suppressed
278 $deleted = $suppressed = false;
279 $allowed = $this->mNewRev
->userCan( Revision
::DELETED_TEXT
, $user );
283 # mOldRev is false if the difference engine is called with a "vague" query for
284 # a diff between a version V and its previous version V' AND the version V
285 # is the first version of that article. In that case, V' does not exist.
286 if ( $this->mOldRev
=== false ) {
287 $out->setPageTitle( $this->msg( 'difference-title', $this->mNewPage
->getPrefixedText() ) );
290 // Allow extensions to change the $oldHeader variable
291 Hooks
::run( 'DifferenceEngineOldHeaderNoOldRev', [ &$oldHeader ] );
293 Hooks
::run( 'DiffViewHeader', [ $this, $this->mOldRev
, $this->mNewRev
] );
295 if ( $this->mNewPage
->equals( $this->mOldPage
) ) {
296 $out->setPageTitle( $this->msg( 'difference-title', $this->mNewPage
->getPrefixedText() ) );
299 $out->setPageTitle( $this->msg( 'difference-title-multipage',
300 $this->mOldPage
->getPrefixedText(), $this->mNewPage
->getPrefixedText() ) );
301 $out->addSubtitle( $this->msg( 'difference-multipage' ) );
305 if ( $samePage && $this->mNewPage
->quickUserCan( 'edit', $user ) ) {
306 if ( $this->mNewRev
->isCurrent() && $this->mNewPage
->userCan( 'rollback', $user ) ) {
307 $rollbackLink = Linker
::generateRollback( $this->mNewRev
, $this->getContext() );
308 if ( $rollbackLink ) {
309 $out->preventClickjacking();
310 $rollback = '   ' . $rollbackLink;
314 if ( !$this->mOldRev
->isDeleted( Revision
::DELETED_TEXT
) &&
315 !$this->mNewRev
->isDeleted( Revision
::DELETED_TEXT
)
317 $undoLink = Html
::element( 'a', [
318 'href' => $this->mNewPage
->getLocalURL( [
320 'undoafter' => $this->mOldid
,
321 'undo' => $this->mNewid
323 'title' => Linker
::titleAttrib( 'undo' ),
325 $this->msg( 'editundo' )->text()
327 $revisionTools['mw-diff-undo'] = $undoLink;
331 # Make "previous revision link"
332 if ( $samePage && $this->mOldRev
->getPrevious() ) {
333 $prevlink = Linker
::linkKnown(
335 $this->msg( 'previousdiff' )->escaped(),
336 [ 'id' => 'differences-prevlink' ],
337 [ 'diff' => 'prev', 'oldid' => $this->mOldid
] +
$query
340 $prevlink = ' ';
343 if ( $this->mOldRev
->isMinor() ) {
344 $oldminor = ChangesList
::flag( 'minor' );
349 $ldel = $this->revisionDeleteLink( $this->mOldRev
);
350 $oldRevisionHeader = $this->getRevisionHeader( $this->mOldRev
, 'complete' );
351 $oldChangeTags = ChangeTags
::formatSummaryRow( $this->mOldTags
, 'diff', $this->getContext() );
353 $oldHeader = '<div id="mw-diff-otitle1"><strong>' . $oldRevisionHeader . '</strong></div>' .
354 '<div id="mw-diff-otitle2">' .
355 Linker
::revUserTools( $this->mOldRev
, !$this->unhide
) . '</div>' .
356 '<div id="mw-diff-otitle3">' . $oldminor .
357 Linker
::revComment( $this->mOldRev
, !$diffOnly, !$this->unhide
) . $ldel . '</div>' .
358 '<div id="mw-diff-otitle5">' . $oldChangeTags[0] . '</div>' .
359 '<div id="mw-diff-otitle4">' . $prevlink . '</div>';
361 // Allow extensions to change the $oldHeader variable
362 Hooks
::run( 'DifferenceEngineOldHeader', [ $this, &$oldHeader, $prevlink, $oldminor,
363 $diffOnly, $ldel, $this->unhide
] );
365 if ( $this->mOldRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
366 $deleted = true; // old revisions text is hidden
367 if ( $this->mOldRev
->isDeleted( Revision
::DELETED_RESTRICTED
) ) {
368 $suppressed = true; // also suppressed
372 # Check if this user can see the revisions
373 if ( !$this->mOldRev
->userCan( Revision
::DELETED_TEXT
, $user ) ) {
378 # Make "next revision link"
379 # Skip next link on the top revision
380 if ( $samePage && !$this->mNewRev
->isCurrent() ) {
381 $nextlink = Linker
::linkKnown(
383 $this->msg( 'nextdiff' )->escaped(),
384 [ 'id' => 'differences-nextlink' ],
385 [ 'diff' => 'next', 'oldid' => $this->mNewid
] +
$query
388 $nextlink = ' ';
391 if ( $this->mNewRev
->isMinor() ) {
392 $newminor = ChangesList
::flag( 'minor' );
397 # Handle RevisionDelete links...
398 $rdel = $this->revisionDeleteLink( $this->mNewRev
);
400 # Allow extensions to define their own revision tools
401 Hooks
::run( 'DiffRevisionTools',
402 [ $this->mNewRev
, &$revisionTools, $this->mOldRev
, $user ] );
403 $formattedRevisionTools = [];
404 // Put each one in parentheses (poor man's button)
405 foreach ( $revisionTools as $key => $tool ) {
406 $toolClass = is_string( $key ) ?
$key : 'mw-diff-tool';
407 $element = Html
::rawElement(
409 [ 'class' => $toolClass ],
410 $this->msg( 'parentheses' )->rawParams( $tool )->escaped()
412 $formattedRevisionTools[] = $element;
414 $newRevisionHeader = $this->getRevisionHeader( $this->mNewRev
, 'complete' ) .
415 ' ' . implode( ' ', $formattedRevisionTools );
416 $newChangeTags = ChangeTags
::formatSummaryRow( $this->mNewTags
, 'diff', $this->getContext() );
418 $newHeader = '<div id="mw-diff-ntitle1"><strong>' . $newRevisionHeader . '</strong></div>' .
419 '<div id="mw-diff-ntitle2">' . Linker
::revUserTools( $this->mNewRev
, !$this->unhide
) .
421 '<div id="mw-diff-ntitle3">' . $newminor .
422 Linker
::revComment( $this->mNewRev
, !$diffOnly, !$this->unhide
) . $rdel . '</div>' .
423 '<div id="mw-diff-ntitle5">' . $newChangeTags[0] . '</div>' .
424 '<div id="mw-diff-ntitle4">' . $nextlink . $this->markPatrolledLink() . '</div>';
426 // Allow extensions to change the $newHeader variable
427 Hooks
::run( 'DifferenceEngineNewHeader', [ $this, &$newHeader, $formattedRevisionTools,
428 $nextlink, $rollback, $newminor, $diffOnly, $rdel, $this->unhide
] );
430 if ( $this->mNewRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
431 $deleted = true; // new revisions text is hidden
432 if ( $this->mNewRev
->isDeleted( Revision
::DELETED_RESTRICTED
) ) {
433 $suppressed = true; // also suppressed
437 # If the diff cannot be shown due to a deleted revision, then output
438 # the diff header and links to unhide (if available)...
439 if ( $deleted && ( !$this->unhide ||
!$allowed ) ) {
440 $this->showDiffStyle();
441 $multi = $this->getMultiNotice();
442 $out->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
444 $msg = $suppressed ?
'rev-suppressed-no-diff' : 'rev-deleted-no-diff';
445 # Give explanation for why revision is not visible
446 $out->wrapWikiMsg( "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n",
449 # Give explanation and add a link to view the diff...
450 $query = $this->getRequest()->appendQueryValue( 'unhide', '1' );
451 $link = $this->getTitle()->getFullURL( $query );
452 $msg = $suppressed ?
'rev-suppressed-unhide-diff' : 'rev-deleted-unhide-diff';
454 "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n",
458 # Otherwise, output a regular diff...
460 # Add deletion notice if the user is viewing deleted content
463 $msg = $suppressed ?
'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
464 $notice = "<div id='mw-$msg' class='mw-warning plainlinks'>\n" .
465 $this->msg( $msg )->parse() .
468 $this->showDiff( $oldHeader, $newHeader, $notice );
470 $this->renderNewRevision();
476 * Build a link to mark a change as patrolled.
478 * Returns empty string if there's either no revision to patrol or the user is not allowed to.
479 * Side effect: When the patrol link is build, this method will call
480 * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
482 * @return string HTML or empty string
484 protected function markPatrolledLink() {
485 if ( $this->mMarkPatrolledLink
=== null ) {
486 $linkInfo = $this->getMarkPatrolledLinkInfo();
487 // If false, there is no patrol link needed/allowed
489 $this->mMarkPatrolledLink
= '';
491 $this->mMarkPatrolledLink
= ' <span class="patrollink" data-mw="interface">[' .
494 $this->msg( 'markaspatrolleddiff' )->escaped(),
497 'action' => 'markpatrolled',
498 'rcid' => $linkInfo['rcid'],
501 // Allow extensions to change the markpatrolled link
502 Hooks
::run( 'DifferenceEngineMarkPatrolledLink', [ $this,
503 &$this->mMarkPatrolledLink
, $linkInfo['rcid'] ] );
506 return $this->mMarkPatrolledLink
;
510 * Returns an array of meta data needed to build a "mark as patrolled" link and
511 * adds the mediawiki.page.patrol.ajax to the output.
513 * @return array|false An array of meta data for a patrol link (rcid only)
514 * or false if no link is needed
516 protected function getMarkPatrolledLinkInfo() {
517 global $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
519 $user = $this->getUser();
521 // Prepare a change patrol link, if applicable
523 // Is patrolling enabled and the user allowed to?
524 $wgUseRCPatrol && $this->mNewPage
->quickUserCan( 'patrol', $user ) &&
525 // Only do this if the revision isn't more than 6 hours older
526 // than the Max RC age (6h because the RC might not be cleaned out regularly)
527 RecentChange
::isInRCLifespan( $this->mNewRev
->getTimestamp(), 21600 )
529 // Look for an unpatrolled change corresponding to this diff
530 $db = wfGetDB( DB_REPLICA
);
531 $change = RecentChange
::newFromConds(
533 'rc_timestamp' => $db->timestamp( $this->mNewRev
->getTimestamp() ),
534 'rc_this_oldid' => $this->mNewid
,
540 if ( $change && !$change->getPerformer()->equals( $user ) ) {
541 $rcid = $change->getAttribute( 'rc_id' );
543 // None found or the page has been created by the current user.
544 // If the user could patrol this it already would be patrolled
548 // Allow extensions to possibly change the rcid here
549 // For example the rcid might be set to zero due to the user
550 // being the same as the performer of the change but an extension
551 // might still want to show it under certain conditions
552 Hooks
::run( 'DifferenceEngineMarkPatrolledRCID', [ &$rcid, $this, $change, $user ] );
556 $this->getOutput()->preventClickjacking();
557 if ( $wgEnableAPI && $wgEnableWriteAPI
558 && $user->isAllowed( 'writeapi' )
560 $this->getOutput()->addModules( 'mediawiki.page.patrol.ajax' );
569 // No mark as patrolled link applicable
574 * @param Revision $rev
578 protected function revisionDeleteLink( $rev ) {
579 $link = Linker
::getRevDeleteLink( $this->getUser(), $rev, $rev->getTitle() );
580 if ( $link !== '' ) {
581 $link = '   ' . $link . ' ';
588 * Show the new revision of the page.
590 public function renderNewRevision() {
591 $out = $this->getOutput();
592 $revHeader = $this->getRevisionHeader( $this->mNewRev
);
593 # Add "current version as of X" title
594 $out->addHTML( "<hr class='diff-hr' id='mw-oldid' />
595 <h2 class='diff-currentversion-title'>{$revHeader}</h2>\n" );
596 # Page content may be handled by a hooked call instead...
597 # @codingStandardsIgnoreStart Ignoring long lines.
598 if ( Hooks
::run( 'ArticleContentOnDiff', [ $this, $out ] ) ) {
599 $this->loadNewText();
600 $out->setRevisionId( $this->mNewid
);
601 $out->setRevisionTimestamp( $this->mNewRev
->getTimestamp() );
602 $out->setArticleFlag( true );
604 // NOTE: only needed for B/C: custom rendering of JS/CSS via hook
605 if ( $this->mNewPage
->isCssJsSubpage() ||
$this->mNewPage
->isCssOrJsPage() ) {
606 // This needs to be synchronised with Article::showCssOrJsPage(), which sucks
607 // Give hooks a chance to customise the output
608 // @todo standardize this crap into one function
609 if ( ContentHandler
::runLegacyHooks( 'ShowRawCssJs', [ $this->mNewContent
, $this->mNewPage
, $out ], '1.24' ) ) {
610 // NOTE: deprecated hook, B/C only
611 // use the content object's own rendering
612 $cnt = $this->mNewRev
->getContent();
613 $po = $cnt ?
$cnt->getParserOutput( $this->mNewRev
->getTitle(), $this->mNewRev
->getId() ) : null;
615 $out->addParserOutputContent( $po );
618 } elseif ( !Hooks
::run( 'ArticleContentViewCustom', [ $this->mNewContent
, $this->mNewPage
, $out ] ) ) {
619 // Handled by extension
620 } elseif ( !ContentHandler
::runLegacyHooks(
622 [ $this->mNewContent
, $this->mNewPage
, $out ],
625 // NOTE: deprecated hook, B/C only
626 // Handled by extension
629 if ( $this->getTitle()->equals( $this->mNewPage
) ) {
630 // If the Title stored in the context is the same as the one
631 // of the new revision, we can use its associated WikiPage
633 $wikiPage = $this->getWikiPage();
635 // Otherwise we need to create our own WikiPage object
636 $wikiPage = WikiPage
::factory( $this->mNewPage
);
639 $parserOutput = $this->getParserOutput( $wikiPage, $this->mNewRev
);
641 # WikiPage::getParserOutput() should not return false, but just in case
642 if ( $parserOutput ) {
643 // Allow extensions to change parser output here
644 if ( Hooks
::run( 'DifferenceEngineRenderRevisionAddParserOutput', [ $this, $out, $parserOutput, $wikiPage ] ) ) {
645 $out->addParserOutput( $parserOutput );
650 # @codingStandardsIgnoreEnd
652 // Allow extensions to optionally not show the final patrolled link
653 if ( Hooks
::run( 'DifferenceEngineRenderRevisionShowFinalPatrolLink' ) ) {
654 # Add redundant patrol link on bottom...
655 $out->addHTML( $this->markPatrolledLink() );
659 protected function getParserOutput( WikiPage
$page, Revision
$rev ) {
660 $parserOptions = $page->makeParserOptions( $this->getContext() );
662 if ( !$rev->isCurrent() ||
!$rev->getTitle()->quickUserCan( 'edit', $this->getUser() ) ) {
663 $parserOptions->setEditSection( false );
666 $parserOutput = $page->getParserOutput( $parserOptions, $rev->getId() );
668 return $parserOutput;
672 * Get the diff text, send it to the OutputPage object
673 * Returns false if the diff could not be generated, otherwise returns true
675 * @param string|bool $otitle Header for old text or false
676 * @param string|bool $ntitle Header for new text or false
677 * @param string $notice HTML between diff header and body
681 public function showDiff( $otitle, $ntitle, $notice = '' ) {
682 // Allow extensions to affect the output here
683 Hooks
::run( 'DifferenceEngineShowDiff', [ $this ] );
685 $diff = $this->getDiff( $otitle, $ntitle, $notice );
686 if ( $diff === false ) {
687 $this->showMissingRevision();
691 $this->showDiffStyle();
692 $this->getOutput()->addHTML( $diff );
699 * Add style sheets for diff display.
701 public function showDiffStyle() {
702 $this->getOutput()->addModuleStyles( 'mediawiki.diff.styles' );
706 * Get complete diff table, including header
708 * @param string|bool $otitle Header for old text or false
709 * @param string|bool $ntitle Header for new text or false
710 * @param string $notice HTML between diff header and body
714 public function getDiff( $otitle, $ntitle, $notice = '' ) {
715 $body = $this->getDiffBody();
716 if ( $body === false ) {
720 $multi = $this->getMultiNotice();
721 // Display a message when the diff is empty
722 if ( $body === '' ) {
723 $notice .= '<div class="mw-diff-empty">' .
724 $this->msg( 'diff-empty' )->parse() .
728 return $this->addHeader( $body, $otitle, $ntitle, $multi, $notice );
732 * Get the diff table body, without header
734 * @return mixed (string/false)
736 public function getDiffBody() {
737 $this->mCacheHit
= true;
738 // Check if the diff should be hidden from this user
739 if ( !$this->loadRevisionData() ) {
741 } elseif ( $this->mOldRev
&&
742 !$this->mOldRev
->userCan( Revision
::DELETED_TEXT
, $this->getUser() )
745 } elseif ( $this->mNewRev
&&
746 !$this->mNewRev
->userCan( Revision
::DELETED_TEXT
, $this->getUser() )
751 if ( $this->mOldRev
=== false ||
( $this->mOldRev
&& $this->mNewRev
752 && $this->mOldRev
->getId() == $this->mNewRev
->getId() )
754 if ( Hooks
::run( 'DifferenceEngineShowEmptyOldContent', [ $this ] ) ) {
760 $cache = ObjectCache
::getMainWANInstance();
761 if ( $this->mOldid
&& $this->mNewid
) {
762 $key = $this->getDiffBodyCacheKey();
765 if ( !$this->mRefreshCache
) {
766 $difftext = $cache->get( $key );
768 wfIncrStats( 'diff_cache.hit' );
769 $difftext = $this->localiseLineNumbers( $difftext );
770 $difftext .= "\n<!-- diff cache key $key -->\n";
774 } // don't try to load but save the result
776 $this->mCacheHit
= false;
778 // Loadtext is permission safe, this just clears out the diff
779 if ( !$this->loadText() ) {
783 $difftext = $this->generateContentDiffBody( $this->mOldContent
, $this->mNewContent
);
785 // Save to cache for 7 days
786 if ( !Hooks
::run( 'AbortDiffCache', [ &$this ] ) ) {
787 wfIncrStats( 'diff_cache.uncacheable' );
788 } elseif ( $key !== false && $difftext !== false ) {
789 wfIncrStats( 'diff_cache.miss' );
790 $cache->set( $key, $difftext, 7 * 86400 );
792 wfIncrStats( 'diff_cache.uncacheable' );
794 // Replace line numbers with the text in the user's language
795 if ( $difftext !== false ) {
796 $difftext = $this->localiseLineNumbers( $difftext );
803 * Returns the cache key for diff body text or content.
807 * @throws MWException
810 protected function getDiffBodyCacheKey() {
811 if ( !$this->mOldid ||
!$this->mNewid
) {
812 throw new MWException( 'mOldid and mNewid must be set to get diff cache key.' );
815 return wfMemcKey( 'diff', 'version', self
::DIFF_VERSION
,
816 'oldid', $this->mOldid
, 'newid', $this->mNewid
);
820 * Generate a diff, no caching.
822 * This implementation uses generateTextDiffBody() to generate a diff based on the default
823 * serialization of the given Content objects. This will fail if $old or $new are not
824 * instances of TextContent.
826 * Subclasses may override this to provide a different rendering for the diff,
827 * perhaps taking advantage of the content's native form. This is required for all content
828 * models that are not text based.
832 * @param Content $old Old content
833 * @param Content $new New content
835 * @throws MWException If old or new content is not an instance of TextContent.
836 * @return bool|string
838 public function generateContentDiffBody( Content
$old, Content
$new ) {
839 if ( !( $old instanceof TextContent
) ) {
840 throw new MWException( "Diff not implemented for " . get_class( $old ) . "; " .
841 "override generateContentDiffBody to fix this." );
844 if ( !( $new instanceof TextContent
) ) {
845 throw new MWException( "Diff not implemented for " . get_class( $new ) . "; "
846 . "override generateContentDiffBody to fix this." );
849 $otext = $old->serialize();
850 $ntext = $new->serialize();
852 return $this->generateTextDiffBody( $otext, $ntext );
856 * Generate a diff, no caching
858 * @todo move this to TextDifferenceEngine, make DifferenceEngine abstract. At some point.
860 * @param string $otext Old text, must be already segmented
861 * @param string $ntext New text, must be already segmented
863 * @return bool|string
865 public function generateTextDiffBody( $otext, $ntext ) {
866 $diff = function() use ( $otext, $ntext ) {
867 $time = microtime( true );
869 $result = $this->textDiff( $otext, $ntext );
871 $time = intval( ( microtime( true ) - $time ) * 1000 );
872 $this->getStats()->timing( 'diff_time', $time );
873 // Log requests slower than 99th percentile
874 if ( $time > 100 && $this->mOldPage
&& $this->mNewPage
) {
876 "$time ms diff: {$this->mOldid} -> {$this->mNewid} {$this->mNewPage}" );
883 * @param Status $status
886 $error = function( $status ) {
887 throw new FatalError( $status->getWikiText() );
890 // Use PoolCounter if the diff looks like it can be expensive
891 if ( strlen( $otext ) +
strlen( $ntext ) > 20000 ) {
892 $work = new PoolCounterWorkViaCallback( 'diff',
893 md5( $otext ) . md5( $ntext ),
894 [ 'doWork' => $diff, 'error' => $error ]
896 return $work->execute();
903 * Generates diff, to be wrapped internally in a logging/instrumentation
905 * @param string $otext Old text, must be already segmented
906 * @param string $ntext New text, must be already segmented
907 * @return bool|string
909 protected function textDiff( $otext, $ntext ) {
910 global $wgExternalDiffEngine, $wgContLang;
912 $otext = str_replace( "\r\n", "\n", $otext );
913 $ntext = str_replace( "\r\n", "\n", $ntext );
915 if ( $wgExternalDiffEngine == 'wikidiff' ||
$wgExternalDiffEngine == 'wikidiff3' ) {
916 wfDeprecated( "\$wgExternalDiffEngine = '{$wgExternalDiffEngine}'", '1.27' );
917 $wgExternalDiffEngine = false;
918 } elseif ( $wgExternalDiffEngine == 'wikidiff2' ) {
919 // Same as above, but with no deprecation warnings
920 $wgExternalDiffEngine = false;
921 } elseif ( !is_string( $wgExternalDiffEngine ) && $wgExternalDiffEngine !== false ) {
922 // And prevent people from shooting themselves in the foot...
923 wfWarn( '$wgExternalDiffEngine is set to a non-string value, forcing it to false' );
924 $wgExternalDiffEngine = false;
927 if ( function_exists( 'wikidiff2_do_diff' ) && $wgExternalDiffEngine === false ) {
928 # Better external diff engine, the 2 may some day be dropped
929 # This one does the escaping and segmenting itself
930 $text = wikidiff2_do_diff( $otext, $ntext, 2 );
931 $text .= $this->debug( 'wikidiff2' );
934 } elseif ( $wgExternalDiffEngine !== false && is_executable( $wgExternalDiffEngine ) ) {
936 $tmpDir = wfTempDir();
937 $tempName1 = tempnam( $tmpDir, 'diff_' );
938 $tempName2 = tempnam( $tmpDir, 'diff_' );
940 $tempFile1 = fopen( $tempName1, "w" );
944 $tempFile2 = fopen( $tempName2, "w" );
948 fwrite( $tempFile1, $otext );
949 fwrite( $tempFile2, $ntext );
950 fclose( $tempFile1 );
951 fclose( $tempFile2 );
952 $cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
953 $difftext = wfShellExec( $cmd );
954 $difftext .= $this->debug( "external $wgExternalDiffEngine" );
955 unlink( $tempName1 );
956 unlink( $tempName2 );
962 $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
963 $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
964 $diffs = new Diff( $ota, $nta );
965 $formatter = new TableDiffFormatter();
966 $difftext = $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) );
972 * Generate a debug comment indicating diff generating time,
973 * server node, and generator backend.
975 * @param string $generator : What diff engine was used
979 protected function debug( $generator = "internal" ) {
980 global $wgShowHostnames;
981 if ( !$this->enableDebugComment
) {
984 $data = [ $generator ];
985 if ( $wgShowHostnames ) {
986 $data[] = wfHostname();
988 $data[] = wfTimestamp( TS_DB
);
990 return "<!-- diff generator: " .
991 implode( " ", array_map( "htmlspecialchars", $data ) ) .
996 * Replace line numbers with the text in the user's language
998 * @param string $text
1002 public function localiseLineNumbers( $text ) {
1003 return preg_replace_callback(
1004 '/<!--LINE (\d+)-->/',
1005 [ &$this, 'localiseLineNumbersCb' ],
1010 public function localiseLineNumbersCb( $matches ) {
1011 if ( $matches[1] === '1' && $this->mReducedLineNumbers
) {
1015 return $this->msg( 'lineno' )->numParams( $matches[1] )->escaped();
1019 * If there are revisions between the ones being compared, return a note saying so.
1023 public function getMultiNotice() {
1024 if ( !is_object( $this->mOldRev
) ||
!is_object( $this->mNewRev
) ) {
1026 } elseif ( !$this->mOldPage
->equals( $this->mNewPage
) ) {
1027 // Comparing two different pages? Count would be meaningless.
1031 if ( $this->mOldRev
->getTimestamp() > $this->mNewRev
->getTimestamp() ) {
1032 $oldRev = $this->mNewRev
; // flip
1033 $newRev = $this->mOldRev
; // flip
1034 } else { // normal case
1035 $oldRev = $this->mOldRev
;
1036 $newRev = $this->mNewRev
;
1039 // Sanity: don't show the notice if too many rows must be scanned
1040 // @todo show some special message for that case
1041 $nEdits = $this->mNewPage
->countRevisionsBetween( $oldRev, $newRev, 1000 );
1042 if ( $nEdits > 0 && $nEdits <= 1000 ) {
1043 $limit = 100; // use diff-multi-manyusers if too many users
1044 $users = $this->mNewPage
->getAuthorsBetween( $oldRev, $newRev, $limit );
1045 $numUsers = count( $users );
1047 if ( $numUsers == 1 && $users[0] == $newRev->getUserText( Revision
::RAW
) ) {
1048 $numUsers = 0; // special case to say "by the same user" instead of "by one other user"
1051 return self
::intermediateEditsMsg( $nEdits, $numUsers, $limit );
1054 return ''; // nothing
1058 * Get a notice about how many intermediate edits and users there are
1060 * @param int $numEdits
1061 * @param int $numUsers
1066 public static function intermediateEditsMsg( $numEdits, $numUsers, $limit ) {
1067 if ( $numUsers === 0 ) {
1068 $msg = 'diff-multi-sameuser';
1069 } elseif ( $numUsers > $limit ) {
1070 $msg = 'diff-multi-manyusers';
1073 $msg = 'diff-multi-otherusers';
1076 return wfMessage( $msg )->numParams( $numEdits, $numUsers )->parse();
1080 * Get a header for a specified revision.
1082 * @param Revision $rev
1083 * @param string $complete 'complete' to get the header wrapped depending
1084 * the visibility of the revision and a link to edit the page.
1086 * @return string HTML fragment
1088 protected function getRevisionHeader( Revision
$rev, $complete = '' ) {
1089 $lang = $this->getLanguage();
1090 $user = $this->getUser();
1091 $revtimestamp = $rev->getTimestamp();
1092 $timestamp = $lang->userTimeAndDate( $revtimestamp, $user );
1093 $dateofrev = $lang->userDate( $revtimestamp, $user );
1094 $timeofrev = $lang->userTime( $revtimestamp, $user );
1096 $header = $this->msg(
1097 $rev->isCurrent() ?
'currentrev-asof' : 'revisionasof',
1103 if ( $complete !== 'complete' ) {
1107 $title = $rev->getTitle();
1109 $header = Linker
::linkKnown( $title, $header, [],
1110 [ 'oldid' => $rev->getId() ] );
1112 if ( $rev->userCan( Revision
::DELETED_TEXT
, $user ) ) {
1113 $editQuery = [ 'action' => 'edit' ];
1114 if ( !$rev->isCurrent() ) {
1115 $editQuery['oldid'] = $rev->getId();
1118 $key = $title->quickUserCan( 'edit', $user ) ?
'editold' : 'viewsourceold';
1119 $msg = $this->msg( $key )->escaped();
1120 $editLink = $this->msg( 'parentheses' )->rawParams(
1121 Linker
::linkKnown( $title, $msg, [], $editQuery ) )->escaped();
1122 $header .= ' ' . Html
::rawElement(
1124 [ 'class' => 'mw-diff-edit' ],
1127 if ( $rev->isDeleted( Revision
::DELETED_TEXT
) ) {
1128 $header = Html
::rawElement(
1130 [ 'class' => 'history-deleted' ],
1135 $header = Html
::rawElement( 'span', [ 'class' => 'history-deleted' ], $header );
1142 * Add the header to a diff body
1144 * @param string $diff Diff body
1145 * @param string $otitle Old revision header
1146 * @param string $ntitle New revision header
1147 * @param string $multi Notice telling user that there are intermediate
1148 * revisions between the ones being compared
1149 * @param string $notice Other notices, e.g. that user is viewing deleted content
1153 public function addHeader( $diff, $otitle, $ntitle, $multi = '', $notice = '' ) {
1154 // shared.css sets diff in interface language/dir, but the actual content
1155 // is often in a different language, mostly the page content language/dir
1156 $header = Html
::openElement( 'table', [
1157 'class' => [ 'diff', 'diff-contentalign-' . $this->getDiffLang()->alignStart() ],
1158 'data-mw' => 'interface',
1160 $userLang = htmlspecialchars( $this->getLanguage()->getHtmlCode() );
1162 if ( !$diff && !$otitle ) {
1164 <tr style='vertical-align: top;' lang='{$userLang}'>
1165 <td class='diff-ntitle'>{$ntitle}</td>
1169 if ( $diff ) { // Safari/Chrome show broken output if cols not used
1171 <col class='diff-marker' />
1172 <col class='diff-content' />
1173 <col class='diff-marker' />
1174 <col class='diff-content' />";
1181 if ( $otitle ||
$ntitle ) {
1183 <tr style='vertical-align: top;' lang='{$userLang}'>
1184 <td colspan='$colspan' class='diff-otitle'>{$otitle}</td>
1185 <td colspan='$colspan' class='diff-ntitle'>{$ntitle}</td>
1190 if ( $multi != '' ) {
1191 $header .= "<tr><td colspan='{$multiColspan}' style='text-align: center;' " .
1192 "class='diff-multi' lang='{$userLang}'>{$multi}</td></tr>";
1194 if ( $notice != '' ) {
1195 $header .= "<tr><td colspan='{$multiColspan}' style='text-align: center;' " .
1196 "lang='{$userLang}'>{$notice}</td></tr>";
1199 return $header . $diff . "</table>";
1203 * Use specified text instead of loading from the database
1204 * @param Content $oldContent
1205 * @param Content $newContent
1208 public function setContent( Content
$oldContent, Content
$newContent ) {
1209 $this->mOldContent
= $oldContent;
1210 $this->mNewContent
= $newContent;
1212 $this->mTextLoaded
= 2;
1213 $this->mRevisionsLoaded
= true;
1217 * Set the language in which the diff text is written
1218 * (Defaults to page content language).
1219 * @param Language|string $lang
1222 public function setTextLanguage( $lang ) {
1223 $this->mDiffLang
= wfGetLangObj( $lang );
1227 * Maps a revision pair definition as accepted by DifferenceEngine constructor
1228 * to a pair of actual integers representing revision ids.
1230 * @param int $old Revision id, e.g. from URL parameter 'oldid'
1231 * @param int|string $new Revision id or strings 'next' or 'prev', e.g. from URL parameter 'diff'
1233 * @return int[] List of two revision ids, older first, later second.
1234 * Zero signifies invalid argument passed.
1235 * false signifies that there is no previous/next revision ($old is the oldest/newest one).
1237 public function mapDiffPrevNext( $old, $new ) {
1238 if ( $new === 'prev' ) {
1239 // Show diff between revision $old and the previous one. Get previous one from DB.
1240 $newid = intval( $old );
1241 $oldid = $this->getTitle()->getPreviousRevisionID( $newid );
1242 } elseif ( $new === 'next' ) {
1243 // Show diff between revision $old and the next one. Get next one from DB.
1244 $oldid = intval( $old );
1245 $newid = $this->getTitle()->getNextRevisionID( $oldid );
1247 $oldid = intval( $old );
1248 $newid = intval( $new );
1251 return [ $oldid, $newid ];
1257 private function loadRevisionIds() {
1258 if ( $this->mRevisionsIdsLoaded
) {
1262 $this->mRevisionsIdsLoaded
= true;
1264 $old = $this->mOldid
;
1265 $new = $this->mNewid
;
1267 list( $this->mOldid
, $this->mNewid
) = self
::mapDiffPrevNext( $old, $new );
1268 if ( $new === 'next' && $this->mNewid
=== false ) {
1269 # if no result, NewId points to the newest old revision. The only newer
1270 # revision is cur, which is "0".
1275 'NewDifferenceEngine',
1276 [ $this->getTitle(), &$this->mOldid
, &$this->mNewid
, $old, $new ]
1281 * Load revision metadata for the specified articles. If newid is 0, then compare
1282 * the old article in oldid to the current article; if oldid is 0, then
1283 * compare the current article to the immediately previous one (ignoring the
1286 * If oldid is false, leave the corresponding revision object set
1287 * to false. This is impossible via ordinary user input, and is provided for
1292 public function loadRevisionData() {
1293 if ( $this->mRevisionsLoaded
) {
1297 // Whether it succeeds or fails, we don't want to try again
1298 $this->mRevisionsLoaded
= true;
1300 $this->loadRevisionIds();
1302 // Load the new revision object
1303 if ( $this->mNewid
) {
1304 $this->mNewRev
= Revision
::newFromId( $this->mNewid
);
1306 $this->mNewRev
= Revision
::newFromTitle(
1309 Revision
::READ_NORMAL
1313 if ( !$this->mNewRev
instanceof Revision
) {
1317 // Update the new revision ID in case it was 0 (makes life easier doing UI stuff)
1318 $this->mNewid
= $this->mNewRev
->getId();
1319 $this->mNewPage
= $this->mNewRev
->getTitle();
1321 // Load the old revision object
1322 $this->mOldRev
= false;
1323 if ( $this->mOldid
) {
1324 $this->mOldRev
= Revision
::newFromId( $this->mOldid
);
1325 } elseif ( $this->mOldid
=== 0 ) {
1326 $rev = $this->mNewRev
->getPrevious();
1328 $this->mOldid
= $rev->getId();
1329 $this->mOldRev
= $rev;
1331 // No previous revision; mark to show as first-version only.
1332 $this->mOldid
= false;
1333 $this->mOldRev
= false;
1335 } /* elseif ( $this->mOldid === false ) leave mOldRev false; */
1337 if ( is_null( $this->mOldRev
) ) {
1341 if ( $this->mOldRev
) {
1342 $this->mOldPage
= $this->mOldRev
->getTitle();
1345 // Load tags information for both revisions
1346 $dbr = wfGetDB( DB_REPLICA
);
1347 if ( $this->mOldid
!== false ) {
1348 $this->mOldTags
= $dbr->selectField(
1351 [ 'ts_rev_id' => $this->mOldid
],
1355 $this->mOldTags
= false;
1357 $this->mNewTags
= $dbr->selectField(
1360 [ 'ts_rev_id' => $this->mNewid
],
1368 * Load the text of the revisions, as well as revision data.
1372 public function loadText() {
1373 if ( $this->mTextLoaded
== 2 ) {
1377 // Whether it succeeds or fails, we don't want to try again
1378 $this->mTextLoaded
= 2;
1380 if ( !$this->loadRevisionData() ) {
1384 if ( $this->mOldRev
) {
1385 $this->mOldContent
= $this->mOldRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );
1386 if ( $this->mOldContent
=== null ) {
1391 if ( $this->mNewRev
) {
1392 $this->mNewContent
= $this->mNewRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );
1393 if ( $this->mNewContent
=== null ) {
1402 * Load the text of the new revision, not the old one
1406 public function loadNewText() {
1407 if ( $this->mTextLoaded
>= 1 ) {
1411 $this->mTextLoaded
= 1;
1413 if ( !$this->loadRevisionData() ) {
1417 $this->mNewContent
= $this->mNewRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );