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
25 * Constant to indicate diff cache compatibility.
26 * Bump this when changing the diff formatting in a way that
27 * fixes important bugs or such to force cached diff views to
30 define( 'MW_DIFF_VERSION', '1.11a' );
34 * @ingroup DifferenceEngine
36 class DifferenceEngine
extends ContextSource
{
68 /** @var bool Have the revisions IDs been loaded */
69 private $mRevisionsIdsLoaded = false;
71 /** @var bool Have the revisions been loaded */
72 public $mRevisionsLoaded = false;
74 /** @var int How many text blobs have been loaded, 0, 1 or 2? */
75 public $mTextLoaded = 0;
77 /** @var bool Was the diff fetched from cache? */
78 public $mCacheHit = false;
81 * Set this to true to add debug info to the HTML output.
82 * Warning: this may cause RSS readers to spuriously mark articles as "new"
85 public $enableDebugComment = false;
87 /** @var bool If true, line X is not displayed when X is 1, for example
88 * to increase readability and conserve space with many small diffs.
90 protected $mReducedLineNumbers = false;
92 /** @var string Link to action=markpatrolled */
93 protected $mMarkPatrolledLink = null;
95 /** @var bool Show rev_deleted content if allowed */
96 protected $unhide = false;
98 /** @var bool Refresh the diff cache */
99 protected $mRefreshCache = false;
105 * @param IContextSource $context Context to use, anything else will be ignored
106 * @param int $old Old ID we want to show and diff with.
107 * @param string|int $new Either revision ID or 'prev' or 'next'. Default: 0.
108 * @param int $rcid Deprecated, no longer used!
109 * @param bool $refreshCache If set, refreshes the diff cache
110 * @param bool $unhide If set, allow viewing deleted revs
112 public function __construct( $context = null, $old = 0, $new = 0, $rcid = 0,
113 $refreshCache = false, $unhide = false
115 if ( $context instanceof IContextSource
) {
116 $this->setContext( $context );
119 wfDebug( "DifferenceEngine old '$old' new '$new' rcid '$rcid'\n" );
121 $this->mOldid
= $old;
122 $this->mNewid
= $new;
123 $this->mRefreshCache
= $refreshCache;
124 $this->unhide
= $unhide;
130 public function setReducedLineNumbers( $value = true ) {
131 $this->mReducedLineNumbers
= $value;
137 public function getDiffLang() {
138 if ( $this->mDiffLang
=== null ) {
139 # Default language in which the diff text is written.
140 $this->mDiffLang
= $this->getTitle()->getPageLanguage();
143 return $this->mDiffLang
;
149 public function wasCacheHit() {
150 return $this->mCacheHit
;
156 public function getOldid() {
157 $this->loadRevisionIds();
159 return $this->mOldid
;
165 public function getNewid() {
166 $this->loadRevisionIds();
168 return $this->mNewid
;
172 * Look up a special:Undelete link to the given deleted revision id,
173 * as a workaround for being unable to load deleted diffs in currently.
175 * @param int $id Revision ID
177 * @return mixed URL or false
179 public function deletedLink( $id ) {
180 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
181 $dbr = wfGetDB( DB_SLAVE
);
182 $row = $dbr->selectRow( 'archive', '*',
183 [ 'ar_rev_id' => $id ],
186 $rev = Revision
::newFromArchiveRow( $row );
187 $title = Title
::makeTitleSafe( $row->ar_namespace
, $row->ar_title
);
189 return SpecialPage
::getTitleFor( 'Undelete' )->getFullURL( [
190 'target' => $title->getPrefixedText(),
191 'timestamp' => $rev->getTimestamp()
200 * Build a wikitext link toward a deleted revision, if viewable.
202 * @param int $id Revision ID
204 * @return string Wikitext fragment
206 public function deletedIdMarker( $id ) {
207 $link = $this->deletedLink( $id );
209 return "[$link $id]";
215 private function showMissingRevision() {
216 $out = $this->getOutput();
219 if ( $this->mOldRev
=== null ||
220 ( $this->mOldRev
&& $this->mOldContent
=== null )
222 $missing[] = $this->deletedIdMarker( $this->mOldid
);
224 if ( $this->mNewRev
=== null ||
225 ( $this->mNewRev
&& $this->mNewContent
=== null )
227 $missing[] = $this->deletedIdMarker( $this->mNewid
);
230 $out->setPageTitle( $this->msg( 'errorpagetitle' ) );
231 $msg = $this->msg( 'difference-missing-revision' )
232 ->params( $this->getLanguage()->listToText( $missing ) )
233 ->numParams( count( $missing ) )
235 $out->addHtml( $msg );
238 public function showDiffPage( $diffOnly = false ) {
240 # Allow frames except in certain special cases
241 $out = $this->getOutput();
242 $out->allowClickjacking();
243 $out->setRobotPolicy( 'noindex,nofollow' );
245 if ( !$this->loadRevisionData() ) {
246 $this->showMissingRevision();
251 $user = $this->getUser();
252 $permErrors = $this->mNewPage
->getUserPermissionsErrors( 'read', $user );
253 if ( $this->mOldPage
) { # mOldPage might not be set, see below.
254 $permErrors = wfMergeErrorArrays( $permErrors,
255 $this->mOldPage
->getUserPermissionsErrors( 'read', $user ) );
257 if ( count( $permErrors ) ) {
258 throw new PermissionsError( 'read', $permErrors );
264 # Carry over 'diffonly' param via navigation links
265 if ( $diffOnly != $user->getBoolOption( 'diffonly' ) ) {
266 $query['diffonly'] = $diffOnly;
268 # Cascade unhide param in links for easy deletion browsing
269 if ( $this->unhide
) {
270 $query['unhide'] = 1;
273 # Check if one of the revisions is deleted/suppressed
274 $deleted = $suppressed = false;
275 $allowed = $this->mNewRev
->userCan( Revision
::DELETED_TEXT
, $user );
279 # mOldRev is false if the difference engine is called with a "vague" query for
280 # a diff between a version V and its previous version V' AND the version V
281 # is the first version of that article. In that case, V' does not exist.
282 if ( $this->mOldRev
=== false ) {
283 $out->setPageTitle( $this->msg( 'difference-title', $this->mNewPage
->getPrefixedText() ) );
287 Hooks
::run( 'DiffViewHeader', [ $this, $this->mOldRev
, $this->mNewRev
] );
289 if ( $this->mNewPage
->equals( $this->mOldPage
) ) {
290 $out->setPageTitle( $this->msg( 'difference-title', $this->mNewPage
->getPrefixedText() ) );
293 $out->setPageTitle( $this->msg( 'difference-title-multipage',
294 $this->mOldPage
->getPrefixedText(), $this->mNewPage
->getPrefixedText() ) );
295 $out->addSubtitle( $this->msg( 'difference-multipage' ) );
299 if ( $samePage && $this->mNewPage
->quickUserCan( 'edit', $user ) ) {
300 if ( $this->mNewRev
->isCurrent() && $this->mNewPage
->userCan( 'rollback', $user ) ) {
301 $rollbackLink = Linker
::generateRollback( $this->mNewRev
, $this->getContext() );
302 if ( $rollbackLink ) {
303 $out->preventClickjacking();
304 $rollback = '   ' . $rollbackLink;
308 if ( !$this->mOldRev
->isDeleted( Revision
::DELETED_TEXT
) &&
309 !$this->mNewRev
->isDeleted( Revision
::DELETED_TEXT
)
311 $undoLink = Html
::element( 'a', [
312 'href' => $this->mNewPage
->getLocalURL( [
314 'undoafter' => $this->mOldid
,
315 'undo' => $this->mNewid
317 'title' => Linker
::titleAttrib( 'undo' ),
319 $this->msg( 'editundo' )->text()
321 $revisionTools['mw-diff-undo'] = $undoLink;
325 # Make "previous revision link"
326 if ( $samePage && $this->mOldRev
->getPrevious() ) {
327 $prevlink = Linker
::linkKnown(
329 $this->msg( 'previousdiff' )->escaped(),
330 [ 'id' => 'differences-prevlink' ],
331 [ 'diff' => 'prev', 'oldid' => $this->mOldid
] +
$query
334 $prevlink = ' ';
337 if ( $this->mOldRev
->isMinor() ) {
338 $oldminor = ChangesList
::flag( 'minor' );
343 $ldel = $this->revisionDeleteLink( $this->mOldRev
);
344 $oldRevisionHeader = $this->getRevisionHeader( $this->mOldRev
, 'complete' );
345 $oldChangeTags = ChangeTags
::formatSummaryRow( $this->mOldTags
, 'diff', $this->getContext() );
347 $oldHeader = '<div id="mw-diff-otitle1"><strong>' . $oldRevisionHeader . '</strong></div>' .
348 '<div id="mw-diff-otitle2">' .
349 Linker
::revUserTools( $this->mOldRev
, !$this->unhide
) . '</div>' .
350 '<div id="mw-diff-otitle3">' . $oldminor .
351 Linker
::revComment( $this->mOldRev
, !$diffOnly, !$this->unhide
) . $ldel . '</div>' .
352 '<div id="mw-diff-otitle5">' . $oldChangeTags[0] . '</div>' .
353 '<div id="mw-diff-otitle4">' . $prevlink . '</div>';
355 if ( $this->mOldRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
356 $deleted = true; // old revisions text is hidden
357 if ( $this->mOldRev
->isDeleted( Revision
::DELETED_RESTRICTED
) ) {
358 $suppressed = true; // also suppressed
362 # Check if this user can see the revisions
363 if ( !$this->mOldRev
->userCan( Revision
::DELETED_TEXT
, $user ) ) {
368 # Make "next revision link"
369 # Skip next link on the top revision
370 if ( $samePage && !$this->mNewRev
->isCurrent() ) {
371 $nextlink = Linker
::linkKnown(
373 $this->msg( 'nextdiff' )->escaped(),
374 [ 'id' => 'differences-nextlink' ],
375 [ 'diff' => 'next', 'oldid' => $this->mNewid
] +
$query
378 $nextlink = ' ';
381 if ( $this->mNewRev
->isMinor() ) {
382 $newminor = ChangesList
::flag( 'minor' );
387 # Handle RevisionDelete links...
388 $rdel = $this->revisionDeleteLink( $this->mNewRev
);
390 # Allow extensions to define their own revision tools
391 Hooks
::run( 'DiffRevisionTools',
392 [ $this->mNewRev
, &$revisionTools, $this->mOldRev
, $user ] );
393 $formattedRevisionTools = [];
394 // Put each one in parentheses (poor man's button)
395 foreach ( $revisionTools as $key => $tool ) {
396 $toolClass = is_string( $key ) ?
$key : 'mw-diff-tool';
397 $element = Html
::rawElement(
399 [ 'class' => $toolClass ],
400 $this->msg( 'parentheses' )->rawParams( $tool )->escaped()
402 $formattedRevisionTools[] = $element;
404 $newRevisionHeader = $this->getRevisionHeader( $this->mNewRev
, 'complete' ) .
405 ' ' . implode( ' ', $formattedRevisionTools );
406 $newChangeTags = ChangeTags
::formatSummaryRow( $this->mNewTags
, 'diff', $this->getContext() );
408 $newHeader = '<div id="mw-diff-ntitle1"><strong>' . $newRevisionHeader . '</strong></div>' .
409 '<div id="mw-diff-ntitle2">' . Linker
::revUserTools( $this->mNewRev
, !$this->unhide
) .
411 '<div id="mw-diff-ntitle3">' . $newminor .
412 Linker
::revComment( $this->mNewRev
, !$diffOnly, !$this->unhide
) . $rdel . '</div>' .
413 '<div id="mw-diff-ntitle5">' . $newChangeTags[0] . '</div>' .
414 '<div id="mw-diff-ntitle4">' . $nextlink . $this->markPatrolledLink() . '</div>';
416 if ( $this->mNewRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
417 $deleted = true; // new revisions text is hidden
418 if ( $this->mNewRev
->isDeleted( Revision
::DELETED_RESTRICTED
) ) {
419 $suppressed = true; // also suppressed
423 # If the diff cannot be shown due to a deleted revision, then output
424 # the diff header and links to unhide (if available)...
425 if ( $deleted && ( !$this->unhide ||
!$allowed ) ) {
426 $this->showDiffStyle();
427 $multi = $this->getMultiNotice();
428 $out->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
430 $msg = $suppressed ?
'rev-suppressed-no-diff' : 'rev-deleted-no-diff';
431 # Give explanation for why revision is not visible
432 $out->wrapWikiMsg( "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n",
435 # Give explanation and add a link to view the diff...
436 $query = $this->getRequest()->appendQueryValue( 'unhide', '1' );
437 $link = $this->getTitle()->getFullURL( $query );
438 $msg = $suppressed ?
'rev-suppressed-unhide-diff' : 'rev-deleted-unhide-diff';
440 "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n",
444 # Otherwise, output a regular diff...
446 # Add deletion notice if the user is viewing deleted content
449 $msg = $suppressed ?
'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
450 $notice = "<div id='mw-$msg' class='mw-warning plainlinks'>\n" .
451 $this->msg( $msg )->parse() .
454 $this->showDiff( $oldHeader, $newHeader, $notice );
456 $this->renderNewRevision();
462 * Build a link to mark a change as patrolled.
464 * Returns empty string if there's either no revision to patrol or the user is not allowed to.
465 * Side effect: When the patrol link is build, this method will call
466 * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
468 * @return string HTML or empty string
470 protected function markPatrolledLink() {
471 if ( $this->mMarkPatrolledLink
=== null ) {
472 $linkInfo = $this->getMarkPatrolledLinkInfo();
473 // If false, there is no patrol link needed/allowed
475 $this->mMarkPatrolledLink
= '';
477 $this->mMarkPatrolledLink
= ' <span class="patrollink">[' . Linker
::linkKnown(
479 $this->msg( 'markaspatrolleddiff' )->escaped(),
482 'action' => 'markpatrolled',
483 'rcid' => $linkInfo['rcid'],
484 'token' => $linkInfo['token'],
489 return $this->mMarkPatrolledLink
;
493 * Returns an array of meta data needed to build a "mark as patrolled" link and
494 * adds the mediawiki.page.patrol.ajax to the output.
496 * @return array|false An array of meta data for a patrol link (rcid & token)
497 * or false if no link is needed
499 protected function getMarkPatrolledLinkInfo() {
500 global $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
502 $user = $this->getUser();
504 // Prepare a change patrol link, if applicable
506 // Is patrolling enabled and the user allowed to?
507 $wgUseRCPatrol && $this->mNewPage
->quickUserCan( 'patrol', $user ) &&
508 // Only do this if the revision isn't more than 6 hours older
509 // than the Max RC age (6h because the RC might not be cleaned out regularly)
510 RecentChange
::isInRCLifespan( $this->mNewRev
->getTimestamp(), 21600 )
512 // Look for an unpatrolled change corresponding to this diff
513 $db = wfGetDB( DB_SLAVE
);
514 $change = RecentChange
::newFromConds(
516 'rc_timestamp' => $db->timestamp( $this->mNewRev
->getTimestamp() ),
517 'rc_this_oldid' => $this->mNewid
,
523 if ( $change && !$change->getPerformer()->equals( $user ) ) {
524 $rcid = $change->getAttribute( 'rc_id' );
526 // None found or the page has been created by the current user.
527 // If the user could patrol this it already would be patrolled
532 $this->getOutput()->preventClickjacking();
533 if ( $wgEnableAPI && $wgEnableWriteAPI
534 && $user->isAllowed( 'writeapi' )
536 $this->getOutput()->addModules( 'mediawiki.page.patrol.ajax' );
539 $token = $user->getEditToken( $rcid );
547 // No mark as patrolled link applicable
552 * @param Revision $rev
556 protected function revisionDeleteLink( $rev ) {
557 $link = Linker
::getRevDeleteLink( $this->getUser(), $rev, $rev->getTitle() );
558 if ( $link !== '' ) {
559 $link = '   ' . $link . ' ';
566 * Show the new revision of the page.
568 public function renderNewRevision() {
569 $out = $this->getOutput();
570 $revHeader = $this->getRevisionHeader( $this->mNewRev
);
571 # Add "current version as of X" title
572 $out->addHTML( "<hr class='diff-hr' id='mw-oldid' />
573 <h2 class='diff-currentversion-title'>{$revHeader}</h2>\n" );
574 # Page content may be handled by a hooked call instead...
575 # @codingStandardsIgnoreStart Ignoring long lines.
576 if ( Hooks
::run( 'ArticleContentOnDiff', [ $this, $out ] ) ) {
577 $this->loadNewText();
578 $out->setRevisionId( $this->mNewid
);
579 $out->setRevisionTimestamp( $this->mNewRev
->getTimestamp() );
580 $out->setArticleFlag( true );
582 // NOTE: only needed for B/C: custom rendering of JS/CSS via hook
583 if ( $this->mNewPage
->isCssJsSubpage() ||
$this->mNewPage
->isCssOrJsPage() ) {
584 // This needs to be synchronised with Article::showCssOrJsPage(), which sucks
585 // Give hooks a chance to customise the output
586 // @todo standardize this crap into one function
587 if ( ContentHandler
::runLegacyHooks( 'ShowRawCssJs', [ $this->mNewContent
, $this->mNewPage
, $out ] ) ) {
588 // NOTE: deprecated hook, B/C only
589 // use the content object's own rendering
590 $cnt = $this->mNewRev
->getContent();
591 $po = $cnt ?
$cnt->getParserOutput( $this->mNewRev
->getTitle(), $this->mNewRev
->getId() ) : null;
593 $out->addParserOutputContent( $po );
596 } elseif ( !Hooks
::run( 'ArticleContentViewCustom', [ $this->mNewContent
, $this->mNewPage
, $out ] ) ) {
597 // Handled by extension
598 } elseif ( !ContentHandler
::runLegacyHooks( 'ArticleViewCustom', [ $this->mNewContent
, $this->mNewPage
, $out ] ) ) {
599 // NOTE: deprecated hook, B/C only
600 // Handled by extension
603 if ( $this->getTitle()->equals( $this->mNewPage
) ) {
604 // If the Title stored in the context is the same as the one
605 // of the new revision, we can use its associated WikiPage
607 $wikiPage = $this->getWikiPage();
609 // Otherwise we need to create our own WikiPage object
610 $wikiPage = WikiPage
::factory( $this->mNewPage
);
613 $parserOutput = $this->getParserOutput( $wikiPage, $this->mNewRev
);
615 # WikiPage::getParserOutput() should not return false, but just in case
616 if ( $parserOutput ) {
617 $out->addParserOutput( $parserOutput );
621 # @codingStandardsIgnoreEnd
623 # Add redundant patrol link on bottom...
624 $out->addHTML( $this->markPatrolledLink() );
628 protected function getParserOutput( WikiPage
$page, Revision
$rev ) {
629 $parserOptions = $page->makeParserOptions( $this->getContext() );
631 if ( !$rev->isCurrent() ||
!$rev->getTitle()->quickUserCan( 'edit', $this->getUser() ) ) {
632 $parserOptions->setEditSection( false );
635 $parserOutput = $page->getParserOutput( $parserOptions, $rev->getId() );
637 return $parserOutput;
641 * Get the diff text, send it to the OutputPage object
642 * Returns false if the diff could not be generated, otherwise returns true
644 * @param string|bool $otitle Header for old text or false
645 * @param string|bool $ntitle Header for new text or false
646 * @param string $notice HTML between diff header and body
650 public function showDiff( $otitle, $ntitle, $notice = '' ) {
651 $diff = $this->getDiff( $otitle, $ntitle, $notice );
652 if ( $diff === false ) {
653 $this->showMissingRevision();
657 $this->showDiffStyle();
658 $this->getOutput()->addHTML( $diff );
665 * Add style sheets and supporting JS for diff display.
667 public function showDiffStyle() {
668 $this->getOutput()->addModuleStyles( 'mediawiki.action.history.diff' );
672 * Get complete diff table, including header
674 * @param string|bool $otitle Header for old text or false
675 * @param string|bool $ntitle Header for new text or false
676 * @param string $notice HTML between diff header and body
680 public function getDiff( $otitle, $ntitle, $notice = '' ) {
681 $body = $this->getDiffBody();
682 if ( $body === false ) {
686 $multi = $this->getMultiNotice();
687 // Display a message when the diff is empty
688 if ( $body === '' ) {
689 $notice .= '<div class="mw-diff-empty">' .
690 $this->msg( 'diff-empty' )->parse() .
694 return $this->addHeader( $body, $otitle, $ntitle, $multi, $notice );
698 * Get the diff table body, without header
700 * @return mixed (string/false)
702 public function getDiffBody() {
703 $this->mCacheHit
= true;
704 // Check if the diff should be hidden from this user
705 if ( !$this->loadRevisionData() ) {
707 } elseif ( $this->mOldRev
&&
708 !$this->mOldRev
->userCan( Revision
::DELETED_TEXT
, $this->getUser() )
711 } elseif ( $this->mNewRev
&&
712 !$this->mNewRev
->userCan( Revision
::DELETED_TEXT
, $this->getUser() )
717 if ( $this->mOldRev
=== false ||
( $this->mOldRev
&& $this->mNewRev
718 && $this->mOldRev
->getID() == $this->mNewRev
->getID() )
724 $cache = ObjectCache
::getMainWANInstance();
725 if ( $this->mOldid
&& $this->mNewid
) {
726 $key = $this->getDiffBodyCacheKey();
729 if ( !$this->mRefreshCache
) {
730 $difftext = $cache->get( $key );
732 wfIncrStats( 'diff_cache.hit' );
733 $difftext = $this->localiseLineNumbers( $difftext );
734 $difftext .= "\n<!-- diff cache key $key -->\n";
738 } // don't try to load but save the result
740 $this->mCacheHit
= false;
742 // Loadtext is permission safe, this just clears out the diff
743 if ( !$this->loadText() ) {
747 $difftext = $this->generateContentDiffBody( $this->mOldContent
, $this->mNewContent
);
749 // Save to cache for 7 days
750 if ( !Hooks
::run( 'AbortDiffCache', [ &$this ] ) ) {
751 wfIncrStats( 'diff_cache.uncacheable' );
752 } elseif ( $key !== false && $difftext !== false ) {
753 wfIncrStats( 'diff_cache.miss' );
754 $cache->set( $key, $difftext, 7 * 86400 );
756 wfIncrStats( 'diff_cache.uncacheable' );
758 // Replace line numbers with the text in the user's language
759 if ( $difftext !== false ) {
760 $difftext = $this->localiseLineNumbers( $difftext );
767 * Returns the cache key for diff body text or content.
771 * @throws MWException
774 protected function getDiffBodyCacheKey() {
775 if ( !$this->mOldid ||
!$this->mNewid
) {
776 throw new MWException( 'mOldid and mNewid must be set to get diff cache key.' );
779 return wfMemcKey( 'diff', 'version', MW_DIFF_VERSION
,
780 'oldid', $this->mOldid
, 'newid', $this->mNewid
);
784 * Generate a diff, no caching.
786 * This implementation uses generateTextDiffBody() to generate a diff based on the default
787 * serialization of the given Content objects. This will fail if $old or $new are not
788 * instances of TextContent.
790 * Subclasses may override this to provide a different rendering for the diff,
791 * perhaps taking advantage of the content's native form. This is required for all content
792 * models that are not text based.
796 * @param Content $old Old content
797 * @param Content $new New content
799 * @throws MWException If old or new content is not an instance of TextContent.
800 * @return bool|string
802 public function generateContentDiffBody( Content
$old, Content
$new ) {
803 if ( !( $old instanceof TextContent
) ) {
804 throw new MWException( "Diff not implemented for " . get_class( $old ) . "; " .
805 "override generateContentDiffBody to fix this." );
808 if ( !( $new instanceof TextContent
) ) {
809 throw new MWException( "Diff not implemented for " . get_class( $new ) . "; "
810 . "override generateContentDiffBody to fix this." );
813 $otext = $old->serialize();
814 $ntext = $new->serialize();
816 return $this->generateTextDiffBody( $otext, $ntext );
820 * Generate a diff, no caching
822 * @param string $otext Old text, must be already segmented
823 * @param string $ntext New text, must be already segmented
825 * @return bool|string
826 * @deprecated since 1.21, use generateContentDiffBody() instead!
828 public function generateDiffBody( $otext, $ntext ) {
829 ContentHandler
::deprecated( __METHOD__
, "1.21" );
831 return $this->generateTextDiffBody( $otext, $ntext );
835 * Generate a diff, no caching
837 * @todo move this to TextDifferenceEngine, make DifferenceEngine abstract. At some point.
839 * @param string $otext Old text, must be already segmented
840 * @param string $ntext New text, must be already segmented
842 * @return bool|string
844 public function generateTextDiffBody( $otext, $ntext ) {
845 $time = microtime( true );
847 $result = $this->textDiff( $otext, $ntext );
849 $time = intval( ( microtime( true ) - $time ) * 1000 );
850 $this->getStats()->timing( 'diff_time', $time );
851 // Log requests slower than 99th percentile
852 if ( $time > 100 && $this->mOldPage
&& $this->mNewPage
) {
854 "$time ms diff: {$this->mOldid} -> {$this->mNewid} {$this->mNewPage}" );
861 * Generates diff, to be wrapped internally in a logging/instrumentation
863 * @param string $otext Old text, must be already segmented
864 * @param string $ntext New text, must be already segmented
865 * @return bool|string
867 protected function textDiff( $otext, $ntext ) {
868 global $wgExternalDiffEngine, $wgContLang;
870 $otext = str_replace( "\r\n", "\n", $otext );
871 $ntext = str_replace( "\r\n", "\n", $ntext );
873 if ( $wgExternalDiffEngine == 'wikidiff' ) {
874 wfDeprecated( 'wikidiff support', '1.27' );
875 $wgExternalDiffEngine = false;
878 if ( $wgExternalDiffEngine == 'wikidiff2' ) {
879 if ( function_exists( 'wikidiff2_do_diff' ) ) {
880 # Better external diff engine, the 2 may some day be dropped
881 # This one does the escaping and segmenting itself
882 $text = wikidiff2_do_diff( $otext, $ntext, 2 );
883 $text .= $this->debug( 'wikidiff2' );
887 } elseif ( $wgExternalDiffEngine != 'wikidiff3' && $wgExternalDiffEngine !== false ) {
889 $tmpDir = wfTempDir();
890 $tempName1 = tempnam( $tmpDir, 'diff_' );
891 $tempName2 = tempnam( $tmpDir, 'diff_' );
893 $tempFile1 = fopen( $tempName1, "w" );
897 $tempFile2 = fopen( $tempName2, "w" );
901 fwrite( $tempFile1, $otext );
902 fwrite( $tempFile2, $ntext );
903 fclose( $tempFile1 );
904 fclose( $tempFile2 );
905 $cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
906 $difftext = wfShellExec( $cmd );
907 $difftext .= $this->debug( "external $wgExternalDiffEngine" );
908 unlink( $tempName1 );
909 unlink( $tempName2 );
915 $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
916 $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
917 $diffs = new Diff( $ota, $nta );
918 $formatter = new TableDiffFormatter();
919 $difftext = $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) );
925 * Generate a debug comment indicating diff generating time,
926 * server node, and generator backend.
928 * @param string $generator : What diff engine was used
932 protected function debug( $generator = "internal" ) {
933 global $wgShowHostnames;
934 if ( !$this->enableDebugComment
) {
937 $data = [ $generator ];
938 if ( $wgShowHostnames ) {
939 $data[] = wfHostname();
941 $data[] = wfTimestamp( TS_DB
);
943 return "<!-- diff generator: " .
944 implode( " ", array_map( "htmlspecialchars", $data ) ) .
949 * Replace line numbers with the text in the user's language
951 * @param string $text
955 public function localiseLineNumbers( $text ) {
956 return preg_replace_callback(
957 '/<!--LINE (\d+)-->/',
958 [ &$this, 'localiseLineNumbersCb' ],
963 public function localiseLineNumbersCb( $matches ) {
964 if ( $matches[1] === '1' && $this->mReducedLineNumbers
) {
968 return $this->msg( 'lineno' )->numParams( $matches[1] )->escaped();
972 * If there are revisions between the ones being compared, return a note saying so.
976 public function getMultiNotice() {
977 if ( !is_object( $this->mOldRev
) ||
!is_object( $this->mNewRev
) ) {
979 } elseif ( !$this->mOldPage
->equals( $this->mNewPage
) ) {
980 // Comparing two different pages? Count would be meaningless.
984 if ( $this->mOldRev
->getTimestamp() > $this->mNewRev
->getTimestamp() ) {
985 $oldRev = $this->mNewRev
; // flip
986 $newRev = $this->mOldRev
; // flip
987 } else { // normal case
988 $oldRev = $this->mOldRev
;
989 $newRev = $this->mNewRev
;
992 // Sanity: don't show the notice if too many rows must be scanned
993 // @todo show some special message for that case
994 $nEdits = $this->mNewPage
->countRevisionsBetween( $oldRev, $newRev, 1000 );
995 if ( $nEdits > 0 && $nEdits <= 1000 ) {
996 $limit = 100; // use diff-multi-manyusers if too many users
997 $users = $this->mNewPage
->getAuthorsBetween( $oldRev, $newRev, $limit );
998 $numUsers = count( $users );
1000 if ( $numUsers == 1 && $users[0] == $newRev->getUserText( Revision
::RAW
) ) {
1001 $numUsers = 0; // special case to say "by the same user" instead of "by one other user"
1004 return self
::intermediateEditsMsg( $nEdits, $numUsers, $limit );
1007 return ''; // nothing
1011 * Get a notice about how many intermediate edits and users there are
1013 * @param int $numEdits
1014 * @param int $numUsers
1019 public static function intermediateEditsMsg( $numEdits, $numUsers, $limit ) {
1020 if ( $numUsers === 0 ) {
1021 $msg = 'diff-multi-sameuser';
1022 } elseif ( $numUsers > $limit ) {
1023 $msg = 'diff-multi-manyusers';
1026 $msg = 'diff-multi-otherusers';
1029 return wfMessage( $msg )->numParams( $numEdits, $numUsers )->parse();
1033 * Get a header for a specified revision.
1035 * @param Revision $rev
1036 * @param string $complete 'complete' to get the header wrapped depending
1037 * the visibility of the revision and a link to edit the page.
1039 * @return string HTML fragment
1041 protected function getRevisionHeader( Revision
$rev, $complete = '' ) {
1042 $lang = $this->getLanguage();
1043 $user = $this->getUser();
1044 $revtimestamp = $rev->getTimestamp();
1045 $timestamp = $lang->userTimeAndDate( $revtimestamp, $user );
1046 $dateofrev = $lang->userDate( $revtimestamp, $user );
1047 $timeofrev = $lang->userTime( $revtimestamp, $user );
1049 $header = $this->msg(
1050 $rev->isCurrent() ?
'currentrev-asof' : 'revisionasof',
1056 if ( $complete !== 'complete' ) {
1060 $title = $rev->getTitle();
1062 $header = Linker
::linkKnown( $title, $header, [],
1063 [ 'oldid' => $rev->getID() ] );
1065 if ( $rev->userCan( Revision
::DELETED_TEXT
, $user ) ) {
1066 $editQuery = [ 'action' => 'edit' ];
1067 if ( !$rev->isCurrent() ) {
1068 $editQuery['oldid'] = $rev->getID();
1071 $key = $title->quickUserCan( 'edit', $user ) ?
'editold' : 'viewsourceold';
1072 $msg = $this->msg( $key )->escaped();
1073 $editLink = $this->msg( 'parentheses' )->rawParams(
1074 Linker
::linkKnown( $title, $msg, [], $editQuery ) )->escaped();
1075 $header .= ' ' . Html
::rawElement(
1077 [ 'class' => 'mw-diff-edit' ],
1080 if ( $rev->isDeleted( Revision
::DELETED_TEXT
) ) {
1081 $header = Html
::rawElement(
1083 [ 'class' => 'history-deleted' ],
1088 $header = Html
::rawElement( 'span', [ 'class' => 'history-deleted' ], $header );
1095 * Add the header to a diff body
1097 * @param string $diff Diff body
1098 * @param string $otitle Old revision header
1099 * @param string $ntitle New revision header
1100 * @param string $multi Notice telling user that there are intermediate
1101 * revisions between the ones being compared
1102 * @param string $notice Other notices, e.g. that user is viewing deleted content
1106 public function addHeader( $diff, $otitle, $ntitle, $multi = '', $notice = '' ) {
1107 // shared.css sets diff in interface language/dir, but the actual content
1108 // is often in a different language, mostly the page content language/dir
1109 $header = Html
::openElement( 'table', [
1110 'class' => [ 'diff', 'diff-contentalign-' . $this->getDiffLang()->alignStart() ],
1111 'data-mw' => 'interface',
1113 $userLang = htmlspecialchars( $this->getLanguage()->getHtmlCode() );
1115 if ( !$diff && !$otitle ) {
1117 <tr style='vertical-align: top;' lang='{$userLang}'>
1118 <td class='diff-ntitle'>{$ntitle}</td>
1122 if ( $diff ) { // Safari/Chrome show broken output if cols not used
1124 <col class='diff-marker' />
1125 <col class='diff-content' />
1126 <col class='diff-marker' />
1127 <col class='diff-content' />";
1134 if ( $otitle ||
$ntitle ) {
1136 <tr style='vertical-align: top;' lang='{$userLang}'>
1137 <td colspan='$colspan' class='diff-otitle'>{$otitle}</td>
1138 <td colspan='$colspan' class='diff-ntitle'>{$ntitle}</td>
1143 if ( $multi != '' ) {
1144 $header .= "<tr><td colspan='{$multiColspan}' style='text-align: center;' " .
1145 "class='diff-multi' lang='{$userLang}'>{$multi}</td></tr>";
1147 if ( $notice != '' ) {
1148 $header .= "<tr><td colspan='{$multiColspan}' style='text-align: center;' " .
1149 "lang='{$userLang}'>{$notice}</td></tr>";
1152 return $header . $diff . "</table>";
1156 * Use specified text instead of loading from the database
1157 * @deprecated since 1.21, use setContent() instead.
1159 public function setText( $oldText, $newText ) {
1160 ContentHandler
::deprecated( __METHOD__
, "1.21" );
1162 $oldContent = ContentHandler
::makeContent( $oldText, $this->getTitle() );
1163 $newContent = ContentHandler
::makeContent( $newText, $this->getTitle() );
1165 $this->setContent( $oldContent, $newContent );
1169 * Use specified text instead of loading from the database
1170 * @param Content $oldContent
1171 * @param Content $newContent
1174 public function setContent( Content
$oldContent, Content
$newContent ) {
1175 $this->mOldContent
= $oldContent;
1176 $this->mNewContent
= $newContent;
1178 $this->mTextLoaded
= 2;
1179 $this->mRevisionsLoaded
= true;
1183 * Set the language in which the diff text is written
1184 * (Defaults to page content language).
1185 * @param Language|string $lang
1188 public function setTextLanguage( $lang ) {
1189 $this->mDiffLang
= wfGetLangObj( $lang );
1193 * Maps a revision pair definition as accepted by DifferenceEngine constructor
1194 * to a pair of actual integers representing revision ids.
1196 * @param int $old Revision id, e.g. from URL parameter 'oldid'
1197 * @param int|string $new Revision id or strings 'next' or 'prev', e.g. from URL parameter 'diff'
1199 * @return int[] List of two revision ids, older first, later second.
1200 * Zero signifies invalid argument passed.
1201 * false signifies that there is no previous/next revision ($old is the oldest/newest one).
1203 public function mapDiffPrevNext( $old, $new ) {
1204 if ( $new === 'prev' ) {
1205 // Show diff between revision $old and the previous one. Get previous one from DB.
1206 $newid = intval( $old );
1207 $oldid = $this->getTitle()->getPreviousRevisionID( $newid );
1208 } elseif ( $new === 'next' ) {
1209 // Show diff between revision $old and the next one. Get next one from DB.
1210 $oldid = intval( $old );
1211 $newid = $this->getTitle()->getNextRevisionID( $oldid );
1213 $oldid = intval( $old );
1214 $newid = intval( $new );
1217 return [ $oldid, $newid ];
1223 private function loadRevisionIds() {
1224 if ( $this->mRevisionsIdsLoaded
) {
1228 $this->mRevisionsIdsLoaded
= true;
1230 $old = $this->mOldid
;
1231 $new = $this->mNewid
;
1233 list( $this->mOldid
, $this->mNewid
) = self
::mapDiffPrevNext( $old, $new );
1234 if ( $new === 'next' && $this->mNewid
=== false ) {
1235 # if no result, NewId points to the newest old revision. The only newer
1236 # revision is cur, which is "0".
1241 'NewDifferenceEngine',
1242 [ $this->getTitle(), &$this->mOldid
, &$this->mNewid
, $old, $new ]
1247 * Load revision metadata for the specified articles. If newid is 0, then compare
1248 * the old article in oldid to the current article; if oldid is 0, then
1249 * compare the current article to the immediately previous one (ignoring the
1252 * If oldid is false, leave the corresponding revision object set
1253 * to false. This is impossible via ordinary user input, and is provided for
1258 public function loadRevisionData() {
1259 if ( $this->mRevisionsLoaded
) {
1263 // Whether it succeeds or fails, we don't want to try again
1264 $this->mRevisionsLoaded
= true;
1266 $this->loadRevisionIds();
1268 // Load the new revision object
1269 if ( $this->mNewid
) {
1270 $this->mNewRev
= Revision
::newFromId( $this->mNewid
);
1272 $this->mNewRev
= Revision
::newFromTitle(
1275 Revision
::READ_NORMAL
1279 if ( !$this->mNewRev
instanceof Revision
) {
1283 // Update the new revision ID in case it was 0 (makes life easier doing UI stuff)
1284 $this->mNewid
= $this->mNewRev
->getId();
1285 $this->mNewPage
= $this->mNewRev
->getTitle();
1287 // Load the old revision object
1288 $this->mOldRev
= false;
1289 if ( $this->mOldid
) {
1290 $this->mOldRev
= Revision
::newFromId( $this->mOldid
);
1291 } elseif ( $this->mOldid
=== 0 ) {
1292 $rev = $this->mNewRev
->getPrevious();
1294 $this->mOldid
= $rev->getId();
1295 $this->mOldRev
= $rev;
1297 // No previous revision; mark to show as first-version only.
1298 $this->mOldid
= false;
1299 $this->mOldRev
= false;
1301 } /* elseif ( $this->mOldid === false ) leave mOldRev false; */
1303 if ( is_null( $this->mOldRev
) ) {
1307 if ( $this->mOldRev
) {
1308 $this->mOldPage
= $this->mOldRev
->getTitle();
1311 // Load tags information for both revisions
1312 $dbr = wfGetDB( DB_SLAVE
);
1313 if ( $this->mOldid
!== false ) {
1314 $this->mOldTags
= $dbr->selectField(
1317 [ 'ts_rev_id' => $this->mOldid
],
1321 $this->mOldTags
= false;
1323 $this->mNewTags
= $dbr->selectField(
1326 [ 'ts_rev_id' => $this->mNewid
],
1334 * Load the text of the revisions, as well as revision data.
1338 public function loadText() {
1339 if ( $this->mTextLoaded
== 2 ) {
1343 // Whether it succeeds or fails, we don't want to try again
1344 $this->mTextLoaded
= 2;
1346 if ( !$this->loadRevisionData() ) {
1350 if ( $this->mOldRev
) {
1351 $this->mOldContent
= $this->mOldRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );
1352 if ( $this->mOldContent
=== null ) {
1357 if ( $this->mNewRev
) {
1358 $this->mNewContent
= $this->mNewRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );
1359 if ( $this->mNewContent
=== null ) {
1368 * Load the text of the new revision, not the old one
1372 public function loadNewText() {
1373 if ( $this->mTextLoaded
>= 1 ) {
1377 $this->mTextLoaded
= 1;
1379 if ( !$this->loadRevisionData() ) {
1383 $this->mNewContent
= $this->mNewRev
->getContent( Revision
::FOR_THIS_USER
, $this->getUser() );