3 * User interface for the difference engine
6 * @ingroup DifferenceEngine
10 * Constant to indicate diff cache compatibility.
11 * Bump this when changing the diff formatting in a way that
12 * fixes important bugs or such to force cached diff views to
15 define( 'MW_DIFF_VERSION', '1.11a' );
19 * @ingroup DifferenceEngine
21 class DifferenceEngine
extends ContextSource
{
26 var $mOldtext, $mNewtext;
32 var $mOldPage, $mNewPage;
33 var $mRcidMarkPatrolled;
38 var $mOldRev, $mNewRev;
39 private $mRevisionsIdsLoaded = false; // Have the revisions IDs been loaded
40 var $mRevisionsLoaded = false; // Have the revisions been loaded
41 var $mTextLoaded = 0; // How many text blobs have been loaded, 0, 1 or 2?
42 var $mCacheHit = false; // Was the diff fetched from cache?
45 * Set this to true to add debug info to the HTML output.
46 * Warning: this may cause RSS readers to spuriously mark articles as "new"
49 var $enableDebugComment = false;
51 // If true, line X is not displayed when X is 1, for example to increase
52 // readability and conserve space with many small diffs.
53 protected $mReducedLineNumbers = false;
55 // Link to action=markpatrolled
56 protected $mMarkPatrolledLink = null;
58 protected $unhide = false; # show rev_deleted content if allowed
63 * @param $context IContextSource context to use, anything else will be ignored
64 * @param $old Integer old ID we want to show and diff with.
65 * @param $new String either 'prev' or 'next'.
66 * @param $rcid Integer ??? FIXME (default 0)
67 * @param $refreshCache boolean If set, refreshes the diff cache
68 * @param $unhide boolean If set, allow viewing deleted revs
70 function __construct( $context = null, $old = 0, $new = 0, $rcid = 0,
71 $refreshCache = false, $unhide = false )
73 if ( $context instanceof IContextSource
) {
74 $this->setContext( $context );
77 wfDebug( "DifferenceEngine old '$old' new '$new' rcid '$rcid'\n" );
81 $this->mRcidMarkPatrolled
= intval( $rcid ); # force it to be an integer
82 $this->mRefreshCache
= $refreshCache;
83 $this->unhide
= $unhide;
89 function setReducedLineNumbers( $value = true ) {
90 $this->mReducedLineNumbers
= $value;
96 function getDiffLang() {
97 if ( $this->mDiffLang
=== null ) {
98 # Default language in which the diff text is written.
99 $this->mDiffLang
= $this->getTitle()->getPageLanguage();
101 return $this->mDiffLang
;
107 function wasCacheHit() {
108 return $this->mCacheHit
;
114 function getOldid() {
115 $this->loadRevisionIds();
116 return $this->mOldid
;
122 function getNewid() {
123 $this->loadRevisionIds();
124 return $this->mNewid
;
128 * Look up a special:Undelete link to the given deleted revision id,
129 * as a workaround for being unable to load deleted diffs in currently.
131 * @param int $id revision ID
132 * @return mixed URL or false
134 function deletedLink( $id ) {
135 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
136 $dbr = wfGetDB( DB_SLAVE
);
137 $row = $dbr->selectRow('archive', '*',
138 array( 'ar_rev_id' => $id ),
141 $rev = Revision
::newFromArchiveRow( $row );
142 $title = Title
::makeTitleSafe( $row->ar_namespace
, $row->ar_title
);
143 return SpecialPage
::getTitleFor( 'Undelete' )->getFullURL( array(
144 'target' => $title->getPrefixedText(),
145 'timestamp' => $rev->getTimestamp()
153 * Build a wikitext link toward a deleted revision, if viewable.
155 * @param int $id revision ID
156 * @return string wikitext fragment
158 function deletedIdMarker( $id ) {
159 $link = $this->deletedLink( $id );
161 return "[$link $id]";
167 function showDiffPage( $diffOnly = false ) {
168 wfProfileIn( __METHOD__
);
170 # Allow frames except in certain special cases
171 $out = $this->getOutput();
172 $out->allowClickjacking();
173 $out->setRobotPolicy( 'noindex,nofollow' );
175 if ( !$this->loadRevisionData() ) {
176 // Sounds like a deleted revision... Let's see what we can do.
177 $t = $this->getTitle()->getPrefixedText();
178 $d = $this->msg( 'missingarticle-diff',
179 $this->deletedIdMarker( $this->mOldid
),
180 $this->deletedIdMarker( $this->mNewid
) )->escaped();
181 $out->setPageTitle( $this->msg( 'errorpagetitle' ) );
182 $out->addWikiMsg( 'missing-article', "<nowiki>$t</nowiki>", "<span class='plainlinks'>$d</span>" );
183 wfProfileOut( __METHOD__
);
187 $user = $this->getUser();
188 $permErrors = $this->mNewPage
->getUserPermissionsErrors( 'read', $user );
189 if ( $this->mOldPage
) { # mOldPage might not be set, see below.
190 $permErrors = wfMergeErrorArrays( $permErrors,
191 $this->mOldPage
->getUserPermissionsErrors( 'read', $user ) );
193 if ( count( $permErrors ) ) {
194 wfProfileOut( __METHOD__
);
195 throw new PermissionsError( 'read', $permErrors );
198 # If external diffs are enabled both globally and for the user,
199 # we'll use the application/x-external-editor interface to call
200 # an external diff tool like kompare, kdiff3, etc.
201 if ( ExternalEdit
::useExternalEngine( $this->getContext(), 'diff' ) ) {
203 'File' => array( 'Extension' => 'wiki', 'URL' =>
204 # This should be mOldPage, but it may not be set, see below.
205 $this->mNewPage
->getCanonicalURL( array(
206 'action' => 'raw', 'oldid' => $this->mOldid
) )
208 'File2' => array( 'Extension' => 'wiki', 'URL' =>
209 $this->mNewPage
->getCanonicalURL( array(
210 'action' => 'raw', 'oldid' => $this->mNewid
) )
214 $externalEditor = new ExternalEdit( $this->getContext(), $urls );
215 $externalEditor->execute();
217 wfProfileOut( __METHOD__
);
225 # Carry over 'diffonly' param via navigation links
226 if ( $diffOnly != $user->getBoolOption( 'diffonly' ) ) {
227 $query['diffonly'] = $diffOnly;
229 # Cascade unhide param in links for easy deletion browsing
230 if ( $this->unhide
) {
231 $query['unhide'] = 1;
234 # Check if one of the revisions is deleted/suppressed
235 $deleted = $suppressed = false;
236 $allowed = $this->mNewRev
->userCan( Revision
::DELETED_TEXT
, $user );
238 # mOldRev is false if the difference engine is called with a "vague" query for
239 # a diff between a version V and its previous version V' AND the version V
240 # is the first version of that article. In that case, V' does not exist.
241 if ( $this->mOldRev
=== false ) {
242 $out->setPageTitle( $this->mNewPage
->getPrefixedText() );
243 $out->addSubtitle( $this->msg( 'difference' ) );
247 wfRunHooks( 'DiffViewHeader', array( $this, $this->mOldRev
, $this->mNewRev
) );
249 $sk = $this->getSkin();
250 if ( method_exists( $sk, 'suppressQuickbar' ) ) {
251 $sk->suppressQuickbar();
254 if ( $this->mNewPage
->equals( $this->mOldPage
) ) {
255 $out->setPageTitle( $this->mNewPage
->getPrefixedText() );
256 $out->addSubtitle( $this->msg( 'difference' ) );
259 $out->setPageTitle( $this->mOldPage
->getPrefixedText() . ', ' . $this->mNewPage
->getPrefixedText() );
260 $out->addSubtitle( $this->msg( 'difference-multipage' ) );
264 if ( $samePage && $this->mNewPage
->userCan( 'edit', $user ) ) {
265 if ( $this->mNewRev
->isCurrent() && $this->mNewPage
->userCan( 'rollback', $user ) ) {
266 $out->preventClickjacking();
267 $rollback = '   ' . Linker
::generateRollback( $this->mNewRev
);
269 if ( !$this->mOldRev
->isDeleted( Revision
::DELETED_TEXT
) && !$this->mNewRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
270 $undoLink = ' ' . $this->msg( 'parentheses' )->rawParams(
271 Html
::element( 'a', array(
272 'href' => $this->mNewPage
->getLocalUrl( array(
274 'undoafter' => $this->mOldid
,
275 'undo' => $this->mNewid
) ),
276 'title' => Linker
::titleAttrib( 'undo' )
278 $this->msg( 'editundo' )->text()
283 # Make "previous revision link"
284 if ( $samePage && $this->mOldRev
->getPrevious() ) {
285 $prevlink = Linker
::linkKnown(
287 $this->msg( 'previousdiff' )->escaped(),
288 array( 'id' => 'differences-prevlink' ),
289 array( 'diff' => 'prev', 'oldid' => $this->mOldid
) +
$query
292 $prevlink = ' ';
295 if ( $this->mOldRev
->isMinor() ) {
296 $oldminor = ChangesList
::flag( 'minor' );
301 $ldel = $this->revisionDeleteLink( $this->mOldRev
);
302 $oldRevisionHeader = $this->getRevisionHeader( $this->mOldRev
, 'complete' );
304 $oldHeader = '<div id="mw-diff-otitle1"><strong>' . $oldRevisionHeader . '</strong></div>' .
305 '<div id="mw-diff-otitle2">' .
306 Linker
::revUserTools( $this->mOldRev
, !$this->unhide
) . '</div>' .
307 '<div id="mw-diff-otitle3">' . $oldminor .
308 Linker
::revComment( $this->mOldRev
, !$diffOnly, !$this->unhide
) . $ldel . '</div>' .
309 '<div id="mw-diff-otitle4">' . $prevlink . '</div>';
311 if ( $this->mOldRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
312 $deleted = true; // old revisions text is hidden
313 if ( $this->mOldRev
->isDeleted( Revision
::DELETED_RESTRICTED
) ) {
314 $suppressed = true; // also suppressed
318 # Check if this user can see the revisions
319 if ( !$this->mOldRev
->userCan( Revision
::DELETED_TEXT
, $user ) ) {
324 # Make "next revision link"
325 # Skip next link on the top revision
326 if ( $samePage && !$this->mNewRev
->isCurrent() ) {
327 $nextlink = Linker
::linkKnown(
329 $this->msg( 'nextdiff' )->escaped(),
330 array( 'id' => 'differences-nextlink' ),
331 array( 'diff' => 'next', 'oldid' => $this->mNewid
) +
$query
334 $nextlink = ' ';
337 if ( $this->mNewRev
->isMinor() ) {
338 $newminor = ChangesList
::flag( 'minor' );
343 # Handle RevisionDelete links...
344 $rdel = $this->revisionDeleteLink( $this->mNewRev
);
345 $newRevisionHeader = $this->getRevisionHeader( $this->mNewRev
, 'complete' ) . $undoLink;
347 $newHeader = '<div id="mw-diff-ntitle1"><strong>' . $newRevisionHeader . '</strong></div>' .
348 '<div id="mw-diff-ntitle2">' . Linker
::revUserTools( $this->mNewRev
, !$this->unhide
) .
350 '<div id="mw-diff-ntitle3">' . $newminor .
351 Linker
::revComment( $this->mNewRev
, !$diffOnly, !$this->unhide
) . $rdel . '</div>' .
352 '<div id="mw-diff-ntitle4">' . $nextlink . $this->markPatrolledLink() . '</div>';
354 if ( $this->mNewRev
->isDeleted( Revision
::DELETED_TEXT
) ) {
355 $deleted = true; // new revisions text is hidden
356 if ( $this->mNewRev
->isDeleted( Revision
::DELETED_RESTRICTED
) )
357 $suppressed = true; // also suppressed
360 # If the diff cannot be shown due to a deleted revision, then output
361 # the diff header and links to unhide (if available)...
362 if ( $deleted && ( !$this->unhide ||
!$allowed ) ) {
363 $this->showDiffStyle();
364 $multi = $this->getMultiNotice();
365 $out->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
367 $msg = $suppressed ?
'rev-suppressed-no-diff' : 'rev-deleted-no-diff';
368 # Give explanation for why revision is not visible
369 $out->wrapWikiMsg( "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n",
372 # Give explanation and add a link to view the diff...
373 $link = $this->getTitle()->getFullUrl( $this->getRequest()->appendQueryValue( 'unhide', '1', true ) );
374 $msg = $suppressed ?
'rev-suppressed-unhide-diff' : 'rev-deleted-unhide-diff';
375 $out->wrapWikiMsg( "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n", array( $msg, $link ) );
377 # Otherwise, output a regular diff...
379 # Add deletion notice if the user is viewing deleted content
382 $msg = $suppressed ?
'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
383 $notice = "<div id='mw-$msg' class='mw-warning plainlinks'>\n" . $this->msg( $msg )->parse() . "</div>\n";
385 $this->showDiff( $oldHeader, $newHeader, $notice );
387 $this->renderNewRevision();
390 wfProfileOut( __METHOD__
);
394 * Get a link to mark the change as patrolled, or '' if there's either no
395 * revision to patrol or the user is not allowed to to it.
396 * Side effect: this method will call OutputPage::preventClickjacking()
397 * when a link is builded.
401 protected function markPatrolledLink() {
402 global $wgUseRCPatrol;
404 if ( $this->mMarkPatrolledLink
=== null ) {
405 // Prepare a change patrol link, if applicable
406 if ( $wgUseRCPatrol && $this->mNewPage
->userCan( 'patrol', $this->getUser() ) ) {
407 // If we've been given an explicit change identifier, use it; saves time
408 if ( $this->mRcidMarkPatrolled
) {
409 $rcid = $this->mRcidMarkPatrolled
;
410 $rc = RecentChange
::newFromId( $rcid );
411 // Already patrolled?
412 $rcid = is_object( $rc ) && !$rc->getAttribute( 'rc_patrolled' ) ?
$rcid : 0;
414 // Look for an unpatrolled change corresponding to this diff
415 $db = wfGetDB( DB_SLAVE
);
416 $change = RecentChange
::newFromConds(
418 // Redundant user,timestamp condition so we can use the existing index
419 'rc_user_text' => $this->mNewRev
->getRawUserText(),
420 'rc_timestamp' => $db->timestamp( $this->mNewRev
->getTimestamp() ),
421 'rc_this_oldid' => $this->mNewid
,
422 'rc_last_oldid' => $this->mOldid
,
427 if ( $change instanceof RecentChange
) {
428 $rcid = $change->mAttribs
['rc_id'];
429 $this->mRcidMarkPatrolled
= $rcid;
437 $this->getOutput()->preventClickjacking();
438 $token = $this->getUser()->getEditToken( $rcid );
439 $this->mMarkPatrolledLink
= ' <span class="patrollink">[' . Linker
::linkKnown(
441 $this->msg( 'markaspatrolleddiff' )->escaped(),
444 'action' => 'markpatrolled',
450 $this->mMarkPatrolledLink
= '';
453 $this->mMarkPatrolledLink
= '';
457 return $this->mMarkPatrolledLink
;
461 * @param $rev Revision
464 protected function revisionDeleteLink( $rev ) {
466 $user = $this->getUser();
467 $canHide = $user->isAllowed( 'deleterevision' );
468 // Show del/undel link if:
469 // (a) the user can delete revisions, or
470 // (b) the user can view deleted revision *and* this one is deleted
471 if ( $canHide ||
( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
472 if ( !$rev->userCan( Revision
::DELETED_RESTRICTED
, $user ) ) {
473 $link = Linker
::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
476 'type' => 'revision',
477 'target' => $rev->getTitle()->getPrefixedDBkey(),
478 'ids' => $rev->getId()
480 $link = Linker
::revDeleteLink( $query,
481 $rev->isDeleted( Revision
::DELETED_RESTRICTED
), $canHide );
483 $link = '   ' . $link . ' ';
489 * Show the new revision of the page.
491 function renderNewRevision() {
492 wfProfileIn( __METHOD__
);
493 $out = $this->getOutput();
494 $revHeader = $this->getRevisionHeader( $this->mNewRev
);
495 # Add "current version as of X" title
496 $out->addHTML( "<hr class='diff-hr' />
497 <h2 class='diff-currentversion-title'>{$revHeader}</h2>\n" );
498 # Page content may be handled by a hooked call instead...
499 if ( wfRunHooks( 'ArticleContentOnDiff', array( $this, $out ) ) ) {
500 $this->loadNewText();
501 $out->setRevisionId( $this->mNewid
);
502 $out->setRevisionTimestamp( $this->mNewRev
->getTimestamp() );
503 $out->setArticleFlag( true );
505 if ( $this->mNewPage
->isCssJsSubpage() ||
$this->mNewPage
->isCssOrJsPage() ) {
506 // Stolen from Article::view --AG 2007-10-11
507 // Give hooks a chance to customise the output
508 // @TODO: standardize this crap into one function
509 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mNewtext
, $this->mNewPage
, $out ) ) ) {
510 // Wrap the whole lot in a <pre> and don't parse
512 preg_match( '!\.(css|js)$!u', $this->mNewPage
->getText(), $m );
513 $out->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
514 $out->addHTML( htmlspecialchars( $this->mNewtext
) );
515 $out->addHTML( "\n</pre>\n" );
517 } elseif ( !wfRunHooks( 'ArticleViewCustom', array( $this->mNewtext
, $this->mNewPage
, $out ) ) ) {
518 // Handled by extension
521 $wikiPage = WikiPage
::factory( $this->mNewPage
);
523 $parserOptions = ParserOptions
::newFromContext( $this->getContext() );
524 $parserOptions->enableLimitReport();
525 $parserOptions->setTidy( true );
527 if ( !$this->mNewRev
->isCurrent() ) {
528 $parserOptions->setEditSection( false );
531 $parserOutput = $wikiPage->getParserOutput( $parserOptions, $this->mNewid
);
533 # WikiPage::getParserOutput() should not return false, but just in case
534 if( $parserOutput ) {
535 $out->addParserOutput( $parserOutput );
539 # Add redundant patrol link on bottom...
540 $out->addHTML( $this->markPatrolledLink() );
542 wfProfileOut( __METHOD__
);
546 * Get the diff text, send it to the OutputPage object
547 * Returns false if the diff could not be generated, otherwise returns true
551 function showDiff( $otitle, $ntitle, $notice = '' ) {
552 $diff = $this->getDiff( $otitle, $ntitle, $notice );
553 if ( $diff === false ) {
554 $this->getOutput()->addWikiMsg( 'missing-article', "<nowiki>(fixme, bug)</nowiki>", '' );
557 $this->showDiffStyle();
558 $this->getOutput()->addHTML( $diff );
564 * Add style sheets and supporting JS for diff display.
566 function showDiffStyle() {
567 $this->getOutput()->addModuleStyles( 'mediawiki.action.history.diff' );
571 * Get complete diff table, including header
573 * @param $otitle Title: old title
574 * @param $ntitle Title: new title
575 * @param $notice String: HTML between diff header and body
578 function getDiff( $otitle, $ntitle, $notice = '' ) {
579 $body = $this->getDiffBody();
580 if ( $body === false ) {
583 $multi = $this->getMultiNotice();
584 return $this->addHeader( $body, $otitle, $ntitle, $multi, $notice );
589 * Get the diff table body, without header
591 * @return mixed (string/false)
593 public function getDiffBody() {
595 wfProfileIn( __METHOD__
);
596 $this->mCacheHit
= true;
597 // Check if the diff should be hidden from this user
598 if ( !$this->loadRevisionData() ) {
599 wfProfileOut( __METHOD__
);
601 } elseif ( $this->mOldRev
&& !$this->mOldRev
->userCan( Revision
::DELETED_TEXT
, $this->getUser() ) ) {
602 wfProfileOut( __METHOD__
);
604 } elseif ( $this->mNewRev
&& !$this->mNewRev
->userCan( Revision
::DELETED_TEXT
, $this->getUser() ) ) {
605 wfProfileOut( __METHOD__
);
609 // If mOldRev is false, it means that the
610 if ( $this->mOldRev
=== false ||
( $this->mOldRev
&& $this->mNewRev
611 && $this->mOldRev
->getID() == $this->mNewRev
->getID() ) )
613 wfProfileOut( __METHOD__
);
618 if ( $this->mOldid
&& $this->mNewid
) {
619 $key = wfMemcKey( 'diff', 'version', MW_DIFF_VERSION
,
620 'oldid', $this->mOldid
, 'newid', $this->mNewid
);
622 if ( !$this->mRefreshCache
) {
623 $difftext = $wgMemc->get( $key );
625 wfIncrStats( 'diff_cache_hit' );
626 $difftext = $this->localiseLineNumbers( $difftext );
627 $difftext .= "\n<!-- diff cache key $key -->\n";
628 wfProfileOut( __METHOD__
);
631 } // don't try to load but save the result
633 $this->mCacheHit
= false;
635 // Loadtext is permission safe, this just clears out the diff
636 if ( !$this->loadText() ) {
637 wfProfileOut( __METHOD__
);
641 $difftext = $this->generateDiffBody( $this->mOldtext
, $this->mNewtext
);
643 // Save to cache for 7 days
644 if ( !wfRunHooks( 'AbortDiffCache', array( &$this ) ) ) {
645 wfIncrStats( 'diff_uncacheable' );
646 } elseif ( $key !== false && $difftext !== false ) {
647 wfIncrStats( 'diff_cache_miss' );
648 $wgMemc->set( $key, $difftext, 7 * 86400 );
650 wfIncrStats( 'diff_uncacheable' );
652 // Replace line numbers with the text in the user's language
653 if ( $difftext !== false ) {
654 $difftext = $this->localiseLineNumbers( $difftext );
656 wfProfileOut( __METHOD__
);
661 * Make sure the proper modules are loaded before we try to
664 private function initDiffEngines() {
665 global $wgExternalDiffEngine;
666 if ( $wgExternalDiffEngine == 'wikidiff' && !function_exists( 'wikidiff_do_diff' ) ) {
667 wfProfileIn( __METHOD__
. '-php_wikidiff.so' );
668 wfDl( 'php_wikidiff' );
669 wfProfileOut( __METHOD__
. '-php_wikidiff.so' );
671 elseif ( $wgExternalDiffEngine == 'wikidiff2' && !function_exists( 'wikidiff2_do_diff' ) ) {
672 wfProfileIn( __METHOD__
. '-php_wikidiff2.so' );
674 wfProfileOut( __METHOD__
. '-php_wikidiff2.so' );
679 * Generate a diff, no caching
681 * @param $otext String: old text, must be already segmented
682 * @param $ntext String: new text, must be already segmented
684 function generateDiffBody( $otext, $ntext ) {
685 global $wgExternalDiffEngine, $wgContLang;
687 wfProfileIn( __METHOD__
);
689 $otext = str_replace( "\r\n", "\n", $otext );
690 $ntext = str_replace( "\r\n", "\n", $ntext );
692 $this->initDiffEngines();
694 if ( $wgExternalDiffEngine == 'wikidiff' && function_exists( 'wikidiff_do_diff' ) ) {
695 # For historical reasons, external diff engine expects
696 # input text to be HTML-escaped already
697 $otext = htmlspecialchars ( $wgContLang->segmentForDiff( $otext ) );
698 $ntext = htmlspecialchars ( $wgContLang->segmentForDiff( $ntext ) );
699 wfProfileOut( __METHOD__
);
700 return $wgContLang->unsegmentForDiff( wikidiff_do_diff( $otext, $ntext, 2 ) ) .
701 $this->debug( 'wikidiff1' );
704 if ( $wgExternalDiffEngine == 'wikidiff2' && function_exists( 'wikidiff2_do_diff' ) ) {
705 # Better external diff engine, the 2 may some day be dropped
706 # This one does the escaping and segmenting itself
707 wfProfileIn( 'wikidiff2_do_diff' );
708 $text = wikidiff2_do_diff( $otext, $ntext, 2 );
709 $text .= $this->debug( 'wikidiff2' );
710 wfProfileOut( 'wikidiff2_do_diff' );
711 wfProfileOut( __METHOD__
);
714 if ( $wgExternalDiffEngine != 'wikidiff3' && $wgExternalDiffEngine !== false ) {
716 global $wgTmpDirectory;
717 $tempName1 = tempnam( $wgTmpDirectory, 'diff_' );
718 $tempName2 = tempnam( $wgTmpDirectory, 'diff_' );
720 $tempFile1 = fopen( $tempName1, "w" );
722 wfProfileOut( __METHOD__
);
725 $tempFile2 = fopen( $tempName2, "w" );
727 wfProfileOut( __METHOD__
);
730 fwrite( $tempFile1, $otext );
731 fwrite( $tempFile2, $ntext );
732 fclose( $tempFile1 );
733 fclose( $tempFile2 );
734 $cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
735 wfProfileIn( __METHOD__
. "-shellexec" );
736 $difftext = wfShellExec( $cmd );
737 $difftext .= $this->debug( "external $wgExternalDiffEngine" );
738 wfProfileOut( __METHOD__
. "-shellexec" );
739 unlink( $tempName1 );
740 unlink( $tempName2 );
741 wfProfileOut( __METHOD__
);
746 $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
747 $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
748 $diffs = new Diff( $ota, $nta );
749 $formatter = new TableDiffFormatter();
750 $difftext = $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) ) .
751 wfProfileOut( __METHOD__
);
756 * Generate a debug comment indicating diff generating time,
757 * server node, and generator backend.
759 protected function debug( $generator = "internal" ) {
760 global $wgShowHostnames;
761 if ( !$this->enableDebugComment
) {
764 $data = array( $generator );
765 if ( $wgShowHostnames ) {
766 $data[] = wfHostname();
768 $data[] = wfTimestamp( TS_DB
);
769 return "<!-- diff generator: " .
778 * Replace line numbers with the text in the user's language
780 function localiseLineNumbers( $text ) {
781 return preg_replace_callback( '/<!--LINE (\d+)-->/',
782 array( &$this, 'localiseLineNumbersCb' ), $text );
785 function localiseLineNumbersCb( $matches ) {
786 if ( $matches[1] === '1' && $this->mReducedLineNumbers
) return '';
787 return $this->msg( 'lineno' )->numParams( $matches[1] )->escaped();
792 * If there are revisions between the ones being compared, return a note saying so.
795 function getMultiNotice() {
796 if ( !is_object( $this->mOldRev
) ||
!is_object( $this->mNewRev
) ) {
798 } elseif ( !$this->mOldPage
->equals( $this->mNewPage
) ) {
799 // Comparing two different pages? Count would be meaningless.
803 if ( $this->mOldRev
->getTimestamp() > $this->mNewRev
->getTimestamp() ) {
804 $oldRev = $this->mNewRev
; // flip
805 $newRev = $this->mOldRev
; // flip
806 } else { // normal case
807 $oldRev = $this->mOldRev
;
808 $newRev = $this->mNewRev
;
811 $nEdits = $this->mNewPage
->countRevisionsBetween( $oldRev, $newRev );
813 $limit = 100; // use diff-multi-manyusers if too many users
814 $numUsers = $this->mNewPage
->countAuthorsBetween( $oldRev, $newRev, $limit );
815 return self
::intermediateEditsMsg( $nEdits, $numUsers, $limit );
817 return ''; // nothing
821 * Get a notice about how many intermediate edits and users there are
822 * @param $numEdits int
823 * @param $numUsers int
827 public static function intermediateEditsMsg( $numEdits, $numUsers, $limit ) {
828 if ( $numUsers > $limit ) {
829 $msg = 'diff-multi-manyusers';
834 return wfMessage( $msg )->numParams( $numEdits, $numUsers )->parse();
838 * Get a header for a specified revision.
840 * @param $rev Revision
841 * @param $complete String: 'complete' to get the header wrapped depending
842 * the visibility of the revision and a link to edit the page.
843 * @return String HTML fragment
845 private function getRevisionHeader( Revision
$rev, $complete = '' ) {
846 $lang = $this->getLanguage();
847 $user = $this->getUser();
848 $revtimestamp = $rev->getTimestamp();
849 $timestamp = $lang->userTimeAndDate( $revtimestamp, $user );
850 $dateofrev = $lang->userDate( $revtimestamp, $user );
851 $timeofrev = $lang->userTime( $revtimestamp, $user );
853 $header = $this->msg(
854 $rev->isCurrent() ?
'currentrev-asof' : 'revisionasof',
860 if ( $complete !== 'complete' ) {
864 $title = $rev->getTitle();
866 $header = Linker
::linkKnown( $title, $header, array(),
867 array( 'oldid' => $rev->getID() ) );
869 if ( $rev->userCan( Revision
::DELETED_TEXT
, $user ) ) {
870 $editQuery = array( 'action' => 'edit' );
871 if ( !$rev->isCurrent() ) {
872 $editQuery['oldid'] = $rev->getID();
875 $msg = $this->msg( $title->userCan( 'edit', $user ) ?
'editold' : 'viewsourceold' )->escaped();
876 $header .= ' (' . Linker
::linkKnown( $title, $msg, array(), $editQuery ) . ')';
877 if ( $rev->isDeleted( Revision
::DELETED_TEXT
) ) {
878 $header = Html
::rawElement( 'span', array( 'class' => 'history-deleted' ), $header );
881 $header = Html
::rawElement( 'span', array( 'class' => 'history-deleted' ), $header );
888 * Add the header to a diff body
892 function addHeader( $diff, $otitle, $ntitle, $multi = '', $notice = '' ) {
893 // shared.css sets diff in interface language/dir, but the actual content
894 // is often in a different language, mostly the page content language/dir
895 $tableClass = 'diff diff-contentalign-' . htmlspecialchars( $this->getDiffLang()->alignStart() );
896 $header = "<table class='$tableClass'>";
898 if ( !$diff && !$otitle ) {
901 <td class='diff-ntitle'>{$ntitle}</td>
905 if ( $diff ) { // Safari/Chrome show broken output if cols not used
907 <col class='diff-marker' />
908 <col class='diff-content' />
909 <col class='diff-marker' />
910 <col class='diff-content' />";
919 <td colspan='$colspan' class='diff-otitle'>{$otitle}</td>
920 <td colspan='$colspan' class='diff-ntitle'>{$ntitle}</td>
924 if ( $multi != '' ) {
925 $header .= "<tr><td colspan='{$multiColspan}' align='center' class='diff-multi'>{$multi}</td></tr>";
927 if ( $notice != '' ) {
928 $header .= "<tr><td colspan='{$multiColspan}' align='center'>{$notice}</td></tr>";
931 return $header . $diff . "</table>";
935 * Use specified text instead of loading from the database
937 function setText( $oldText, $newText ) {
938 $this->mOldtext
= $oldText;
939 $this->mNewtext
= $newText;
940 $this->mTextLoaded
= 2;
941 $this->mRevisionsLoaded
= true;
945 * Set the language in which the diff text is written
946 * (Defaults to page content language).
949 function setTextLanguage( $lang ) {
950 $this->mDiffLang
= wfGetLangObj( $lang );
956 private function loadRevisionIds() {
957 if ( $this->mRevisionsIdsLoaded
) {
961 $this->mRevisionsIdsLoaded
= true;
963 $old = $this->mOldid
;
964 $new = $this->mNewid
;
966 if ( $new === 'prev' ) {
967 # Show diff between revision $old and the previous one.
968 # Get previous one from DB.
969 $this->mNewid
= intval( $old );
970 $this->mOldid
= $this->getTitle()->getPreviousRevisionID( $this->mNewid
);
971 } elseif ( $new === 'next' ) {
972 # Show diff between revision $old and the next one.
973 # Get next one from DB.
974 $this->mOldid
= intval( $old );
975 $this->mNewid
= $this->getTitle()->getNextRevisionID( $this->mOldid
);
976 if ( $this->mNewid
=== false ) {
977 # if no result, NewId points to the newest old revision. The only newer
978 # revision is cur, which is "0".
982 $this->mOldid
= intval( $old );
983 $this->mNewid
= intval( $new );
984 wfRunHooks( 'NewDifferenceEngine', array( $this->getTitle(), &$this->mOldid
, &$this->mNewid
, $old, $new ) );
989 * Load revision metadata for the specified articles. If newid is 0, then compare
990 * the old article in oldid to the current article; if oldid is 0, then
991 * compare the current article to the immediately previous one (ignoring the
994 * If oldid is false, leave the corresponding revision object set
995 * to false. This is impossible via ordinary user input, and is provided for
1000 function loadRevisionData() {
1001 if ( $this->mRevisionsLoaded
) {
1005 // Whether it succeeds or fails, we don't want to try again
1006 $this->mRevisionsLoaded
= true;
1008 $this->loadRevisionIds();
1010 // Load the new revision object
1011 $this->mNewRev
= $this->mNewid
1012 ? Revision
::newFromId( $this->mNewid
)
1013 : Revision
::newFromTitle( $this->getTitle() );
1015 if ( !$this->mNewRev
instanceof Revision
) {
1019 // Update the new revision ID in case it was 0 (makes life easier doing UI stuff)
1020 $this->mNewid
= $this->mNewRev
->getId();
1021 $this->mNewPage
= $this->mNewRev
->getTitle();
1023 // Load the old revision object
1024 $this->mOldRev
= false;
1025 if ( $this->mOldid
) {
1026 $this->mOldRev
= Revision
::newFromId( $this->mOldid
);
1027 } elseif ( $this->mOldid
=== 0 ) {
1028 $rev = $this->mNewRev
->getPrevious();
1030 $this->mOldid
= $rev->getId();
1031 $this->mOldRev
= $rev;
1033 // No previous revision; mark to show as first-version only.
1034 $this->mOldid
= false;
1035 $this->mOldRev
= false;
1037 } /* elseif ( $this->mOldid === false ) leave mOldRev false; */
1039 if ( is_null( $this->mOldRev
) ) {
1043 if ( $this->mOldRev
) {
1044 $this->mOldPage
= $this->mOldRev
->getTitle();
1051 * Load the text of the revisions, as well as revision data.
1055 function loadText() {
1056 if ( $this->mTextLoaded
== 2 ) {
1059 // Whether it succeeds or fails, we don't want to try again
1060 $this->mTextLoaded
= 2;
1063 if ( !$this->loadRevisionData() ) {
1066 if ( $this->mOldRev
) {
1067 $this->mOldtext
= $this->mOldRev
->getText( Revision
::FOR_THIS_USER
);
1068 if ( $this->mOldtext
=== false ) {
1072 if ( $this->mNewRev
) {
1073 $this->mNewtext
= $this->mNewRev
->getText( Revision
::FOR_THIS_USER
);
1074 if ( $this->mNewtext
=== false ) {
1082 * Load the text of the new revision, not the old one
1086 function loadNewText() {
1087 if ( $this->mTextLoaded
>= 1 ) {
1090 $this->mTextLoaded
= 1;
1092 if ( !$this->loadRevisionData() ) {
1095 $this->mNewtext
= $this->mNewRev
->getText( Revision
::FOR_THIS_USER
);