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|
<?php
/**
* User interface for the difference engine
*
* @file
* @ingroup DifferenceEngine
*/
/**
* Constant to indicate diff cache compatibility.
* Bump this when changing the diff formatting in a way that
* fixes important bugs or such to force cached diff views to
* clear.
*/
define( 'MW_DIFF_VERSION', '1.11a' );
/**
* @todo document
* @ingroup DifferenceEngine
*/
class DifferenceEngine {
/**#@+
* @private
*/
var $mOldid, $mNewid, $mTitle;
var $mOldtitle, $mNewtitle, $mPagetitle;
var $mOldtext, $mNewtext;
var $mOldPage, $mNewPage;
var $mRcidMarkPatrolled;
var $mOldRev, $mNewRev;
var $mRevisionsLoaded = false; // Have the revisions been loaded
var $mTextLoaded = 0; // How many text blobs have been loaded, 0, 1 or 2?
var $mCacheHit = false; // Was the diff fetched from cache?
/**
* Set this to true to add debug info to the HTML output.
* Warning: this may cause RSS readers to spuriously mark articles as "new"
* (bug 20601)
*/
var $enableDebugComment = false;
// If true, line X is not displayed when X is 1, for example to increase
// readability and conserve space with many small diffs.
protected $mReducedLineNumbers = false;
protected $unhide = false; # show rev_deleted content if allowed
/**#@-*/
/**
* Constructor
* @param $titleObj Title object that the diff is associated with
* @param $old Integer: old ID we want to show and diff with.
* @param $new String: either 'prev' or 'next'.
* @param $rcid Integer: ??? FIXME (default 0)
* @param $refreshCache boolean If set, refreshes the diff cache
* @param $unhide boolean If set, allow viewing deleted revs
*/
function __construct( $titleObj = null, $old = 0, $new = 0, $rcid = 0,
$refreshCache = false, $unhide = false )
{
if ( $titleObj ) {
$this->mTitle = $titleObj;
} else {
global $wgTitle;
$this->mTitle = $wgTitle;
}
wfDebug( "DifferenceEngine old '$old' new '$new' rcid '$rcid'\n" );
if ( 'prev' === $new ) {
# Show diff between revision $old and the previous one.
# Get previous one from DB.
$this->mNewid = intval( $old );
$this->mOldid = $this->mTitle->getPreviousRevisionID( $this->mNewid );
} elseif ( 'next' === $new ) {
# Show diff between revision $old and the next one.
# Get next one from DB.
$this->mOldid = intval( $old );
$this->mNewid = $this->mTitle->getNextRevisionID( $this->mOldid );
if ( false === $this->mNewid ) {
# if no result, NewId points to the newest old revision. The only newer
# revision is cur, which is "0".
$this->mNewid = 0;
}
} else {
$this->mOldid = intval( $old );
$this->mNewid = intval( $new );
wfRunHooks( 'NewDifferenceEngine', array( &$titleObj, &$this->mOldid, &$this->mNewid, $old, $new ) );
}
$this->mRcidMarkPatrolled = intval( $rcid ); # force it to be an integer
$this->mRefreshCache = $refreshCache;
$this->unhide = $unhide;
}
function setReducedLineNumbers( $value = true ) {
$this->mReducedLineNumbers = $value;
}
function getTitle() {
return $this->mTitle;
}
function wasCacheHit() {
return $this->mCacheHit;
}
function getOldid() {
return $this->mOldid;
}
function getNewid() {
return $this->mNewid;
}
function showDiffPage( $diffOnly = false ) {
global $wgUser, $wgOut, $wgUseExternalEditor, $wgUseRCPatrol;
wfProfileIn( __METHOD__ );
# Allow frames except in certain special cases
$wgOut->allowClickjacking();
# If external diffs are enabled both globally and for the user,
# we'll use the application/x-external-editor interface to call
# an external diff tool like kompare, kdiff3, etc.
if ( $wgUseExternalEditor && $wgUser->getOption( 'externaldiff' ) ) {
global $wgInputEncoding, $wgServer, $wgScript, $wgLang;
$wgOut->disable();
header ( "Content-type: application/x-external-editor; charset=" . $wgInputEncoding );
$url1 = $this->mTitle->getFullURL( array(
'action' => 'raw',
'oldid' => $this->mOldid
) );
$url2 = $this->mTitle->getFullURL( array(
'action' => 'raw',
'oldid' => $this->mNewid
) );
$special = $wgLang->getNsText( NS_SPECIAL );
$control = <<<CONTROL
[Process]
Type=Diff text
Engine=MediaWiki
Script={$wgServer}{$wgScript}
Special namespace={$special}
[File]
Extension=wiki
URL=$url1
[File 2]
Extension=wiki
URL=$url2
CONTROL;
echo( $control );
wfProfileOut( __METHOD__ );
return;
}
$wgOut->setArticleFlag( false );
if ( !$this->loadRevisionData() ) {
$t = $this->mTitle->getPrefixedText();
$d = wfMsgExt( 'missingarticle-diff', array( 'escape' ), $this->mOldid, $this->mNewid );
$wgOut->setPagetitle( wfMsg( 'errorpagetitle' ) );
$wgOut->addWikiMsg( 'missing-article', "<nowiki>$t</nowiki>", $d );
wfProfileOut( __METHOD__ );
return;
}
wfRunHooks( 'DiffViewHeader', array( $this, $this->mOldRev, $this->mNewRev ) );
if ( $this->mNewRev->isCurrent() ) {
$wgOut->setArticleFlag( true );
}
# mOldid is false if the difference engine is called with a "vague" query for
# a diff between a version V and its previous version V' AND the version V
# is the first version of that article. In that case, V' does not exist.
if ( $this->mOldid === false ) {
$this->showFirstRevision();
$this->renderNewRevision(); // should we respect $diffOnly here or not?
wfProfileOut( __METHOD__ );
return;
}
$wgOut->suppressQuickbar();
$oldTitle = $this->mOldPage->getPrefixedText();
$newTitle = $this->mNewPage->getPrefixedText();
if ( $oldTitle == $newTitle ) {
$wgOut->setPageTitle( $newTitle );
} else {
$wgOut->setPageTitle( $oldTitle . ', ' . $newTitle );
}
if ( $this->mNewPage->equals( $this->mOldPage ) ) {
$wgOut->setSubtitle( wfMsgExt( 'difference', array( 'parseinline' ) ) );
} else {
$wgOut->setSubtitle( wfMsgExt( 'difference-multipage', array( 'parseinline' ) ) );
}
$wgOut->setRobotPolicy( 'noindex,nofollow' );
if ( !$this->mOldPage->userCanRead() || !$this->mNewPage->userCanRead() ) {
$wgOut->loginToUse();
$wgOut->output();
$wgOut->disable();
wfProfileOut( __METHOD__ );
return;
}
$sk = $wgUser->getSkin();
// Check if page is editable
$editable = $this->mNewRev->getTitle()->userCan( 'edit' );
if ( $editable && $this->mNewRev->isCurrent() && $wgUser->isAllowed( 'rollback' ) ) {
$wgOut->preventClickjacking();
$rollback = '   ' . $sk->generateRollback( $this->mNewRev );
} else {
$rollback = '';
}
// Prepare a change patrol link, if applicable
if ( $wgUseRCPatrol && $this->mTitle->userCan( 'patrol' ) ) {
// If we've been given an explicit change identifier, use it; saves time
if ( $this->mRcidMarkPatrolled ) {
$rcid = $this->mRcidMarkPatrolled;
$rc = RecentChange::newFromId( $rcid );
// Already patrolled?
$rcid = is_object( $rc ) && !$rc->getAttribute( 'rc_patrolled' ) ? $rcid : 0;
} else {
// Look for an unpatrolled change corresponding to this diff
$db = wfGetDB( DB_SLAVE );
$change = RecentChange::newFromConds(
array(
// Redundant user,timestamp condition so we can use the existing index
'rc_user_text' => $this->mNewRev->getRawUserText(),
'rc_timestamp' => $db->timestamp( $this->mNewRev->getTimestamp() ),
'rc_this_oldid' => $this->mNewid,
'rc_last_oldid' => $this->mOldid,
'rc_patrolled' => 0
),
__METHOD__
);
if ( $change instanceof RecentChange ) {
$rcid = $change->mAttribs['rc_id'];
$this->mRcidMarkPatrolled = $rcid;
} else {
// None found
$rcid = 0;
}
}
// Build the link
if ( $rcid ) {
$wgOut->preventClickjacking();
$token = $wgUser->editToken( $rcid );
$patrol = ' <span class="patrollink">[' . $sk->link(
$this->mTitle,
wfMsgHtml( 'markaspatrolleddiff' ),
array(),
array(
'action' => 'markpatrolled',
'rcid' => $rcid,
'token' => $token,
),
array(
'known',
'noclasses'
)
) . ']</span>';
} else {
$patrol = '';
}
} else {
$patrol = '';
}
# Carry over 'diffonly' param via navigation links
if ( $diffOnly != $wgUser->getBoolOption( 'diffonly' ) ) {
$query['diffonly'] = $diffOnly;
}
# Make "previous revision link"
$query['diff'] = 'prev';
$query['oldid'] = $this->mOldid;
# Cascade unhide param in links for easy deletion browsing
if ( $this->unhide ) {
$query['unhide'] = 1;
}
if ( !$this->mOldRev->getPrevious() ) {
$prevlink = ' ';
} else {
$prevlink = $sk->link(
$this->mTitle,
wfMsgHtml( 'previousdiff' ),
array(
'id' => 'differences-prevlink'
),
$query,
array(
'known',
'noclasses'
)
);
}
# Make "next revision link"
$query['diff'] = 'next';
$query['oldid'] = $this->mNewid;
# Skip next link on the top revision
if ( $this->mNewRev->isCurrent() ) {
$nextlink = ' ';
} else {
$nextlink = $sk->link(
$this->mTitle,
wfMsgHtml( 'nextdiff' ),
array(
'id' => 'differences-nextlink'
),
$query,
array(
'known',
'noclasses'
)
);
}
$oldminor = '';
$newminor = '';
if ( $this->mOldRev->isMinor() ) {
$oldminor = ChangesList::flag( 'minor' );
}
if ( $this->mNewRev->isMinor() ) {
$newminor = ChangesList::flag( 'minor' );
}
# Handle RevisionDelete links...
$ldel = $this->revisionDeleteLink( $this->mOldRev );
$rdel = $this->revisionDeleteLink( $this->mNewRev );
$oldHeader = '<div id="mw-diff-otitle1"><strong>' . $this->mOldtitle . '</strong></div>' .
'<div id="mw-diff-otitle2">' .
$sk->revUserTools( $this->mOldRev, !$this->unhide ) . '</div>' .
'<div id="mw-diff-otitle3">' . $oldminor .
$sk->revComment( $this->mOldRev, !$diffOnly, !$this->unhide ) . $ldel . '</div>' .
'<div id="mw-diff-otitle4">' . $prevlink . '</div>';
$newHeader = '<div id="mw-diff-ntitle1"><strong>' . $this->mNewtitle . '</strong></div>' .
'<div id="mw-diff-ntitle2">' . $sk->revUserTools( $this->mNewRev, !$this->unhide ) .
" $rollback</div>" .
'<div id="mw-diff-ntitle3">' . $newminor .
$sk->revComment( $this->mNewRev, !$diffOnly, !$this->unhide ) . $rdel . '</div>' .
'<div id="mw-diff-ntitle4">' . $nextlink . $patrol . '</div>';
# Check if this user can see the revisions
$allowed = $this->mOldRev->userCan( Revision::DELETED_TEXT )
&& $this->mNewRev->userCan( Revision::DELETED_TEXT );
# Check if one of the revisions is deleted/suppressed
$deleted = $suppressed = false;
if ( $this->mOldRev->isDeleted( Revision::DELETED_TEXT ) ) {
$deleted = true; // old revisions text is hidden
if ( $this->mOldRev->isDeleted( Revision::DELETED_RESTRICTED ) )
$suppressed = true; // also suppressed
}
if ( $this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
$deleted = true; // new revisions text is hidden
if ( $this->mNewRev->isDeleted( Revision::DELETED_RESTRICTED ) )
$suppressed = true; // also suppressed
}
# If the diff cannot be shown due to a deleted revision, then output
# the diff header and links to unhide (if available)...
if ( $deleted && ( !$this->unhide || !$allowed ) ) {
$this->showDiffStyle();
$multi = $this->getMultiNotice();
$wgOut->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
if ( !$allowed ) {
$msg = $suppressed ? 'rev-suppressed-no-diff' : 'rev-deleted-no-diff';
# Give explanation for why revision is not visible
$wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
array( $msg ) );
} else {
# Give explanation and add a link to view the diff...
$link = $this->mTitle->getFullUrl( array(
'diff' => $this->mNewid,
'oldid' => $this->mOldid,
'unhide' => 1
) );
$msg = $suppressed ? 'rev-suppressed-unhide-diff' : 'rev-deleted-unhide-diff';
$wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", array( $msg, $link ) );
}
# Otherwise, output a regular diff...
} else {
# Add deletion notice if the user is viewing deleted content
$notice = '';
if ( $deleted ) {
$msg = $suppressed ? 'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
$notice = "<div class='mw-warning plainlinks'>\n" . wfMsgExt( $msg, 'parseinline' ) . "</div>\n";
}
$this->showDiff( $oldHeader, $newHeader, $notice );
if ( !$diffOnly ) {
$this->renderNewRevision();
}
}
wfProfileOut( __METHOD__ );
}
protected function revisionDeleteLink( $rev ) {
global $wgUser;
$link = '';
$canHide = $wgUser->isAllowed( 'deleterevision' );
// Show del/undel link if:
// (a) the user can delete revisions, or
// (b) the user can view deleted revision *and* this one is deleted
if ( $canHide || ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
$sk = $wgUser->getSkin();
if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
$link = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
} else {
$query = array(
'type' => 'revision',
'target' => $rev->mTitle->getPrefixedDbkey(),
'ids' => $rev->getId()
);
$link = $sk->revDeleteLink( $query,
$rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
}
$link = '   ' . $link . ' ';
}
return $link;
}
/**
* Show the new revision of the page.
*/
function renderNewRevision() {
global $wgOut, $wgUser;
wfProfileIn( __METHOD__ );
$wgOut->addHTML( "<hr /><h2>{$this->mPagetitle}</h2>\n" );
# Add deleted rev tag if needed
if ( !$this->mNewRev->userCan( Revision::DELETED_TEXT ) ) {
$wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
} else if ( $this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
$wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
}
$pCache = true;
if ( !$this->mNewRev->isCurrent() ) {
$oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
$pCache = false;
}
$this->loadNewText();
if ( is_object( $this->mNewRev ) ) {
$wgOut->setRevisionId( $this->mNewRev->getId() );
}
if ( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
// Stolen from Article::view --AG 2007-10-11
// Give hooks a chance to customise the output
if ( wfRunHooks( 'ShowRawCssJs', array( $this->mNewtext, $this->mTitle, $wgOut ) ) ) {
// Wrap the whole lot in a <pre> and don't parse
$m = array();
preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
$wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
$wgOut->addHTML( htmlspecialchars( $this->mNewtext ) );
$wgOut->addHTML( "\n</pre>\n" );
}
} elseif ( wfRunHooks( 'ArticleContentOnDiff', array( $this, $wgOut ) ) ) {
if ( $pCache ) {
$article = new Article( $this->mTitle, 0 );
$pOutput = ParserCache::singleton()->get( $article, $wgOut->parserOptions() );
if ( $pOutput ) {
$wgOut->addParserOutput( $pOutput );
} else {
$article->doViewParse();
}
} else {
$wgOut->addWikiTextTidy( $this->mNewtext );
}
}
if ( is_object( $this->mNewRev ) && !$this->mNewRev->isCurrent() ) {
$wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
}
# Add redundant patrol link on bottom...
if ( $this->mRcidMarkPatrolled && $this->mTitle->quickUserCan( 'patrol' ) ) {
$sk = $wgUser->getSkin();
$token = $wgUser->editToken( $this->mRcidMarkPatrolled );
$wgOut->preventClickjacking();
$wgOut->addHTML(
"<div class='patrollink'>[" . $sk->link(
$this->mTitle,
wfMsgHtml( 'markaspatrolleddiff' ),
array(),
array(
'action' => 'markpatrolled',
'rcid' => $this->mRcidMarkPatrolled,
'token' => $token,
)
) . ']</div>'
);
}
wfProfileOut( __METHOD__ );
}
/**
* Show the first revision of an article. Uses normal diff headers in
* contrast to normal "old revision" display style.
*/
function showFirstRevision() {
global $wgOut, $wgUser;
wfProfileIn( __METHOD__ );
# Get article text from the DB
#
if ( ! $this->loadNewText() ) {
$t = $this->mTitle->getPrefixedText();
$d = wfMsgExt( 'missingarticle-diff', array( 'escape' ), $this->mOldid, $this->mNewid );
$wgOut->setPagetitle( wfMsg( 'errorpagetitle' ) );
$wgOut->addWikiMsg( 'missing-article', "<nowiki>$t</nowiki>", $d );
wfProfileOut( __METHOD__ );
return;
}
if ( $this->mNewRev->isCurrent() ) {
$wgOut->setArticleFlag( true );
}
# Check if user is allowed to look at this page. If not, bail out.
#
if ( !$this->mTitle->userCanRead() ) {
$wgOut->loginToUse();
$wgOut->output();
wfProfileOut( __METHOD__ );
throw new MWException( "Permission Error: you do not have access to view this page" );
}
# Prepare the header box
#
$sk = $wgUser->getSkin();
$next = $this->mTitle->getNextRevisionID( $this->mNewid );
if ( !$next ) {
$nextlink = '';
} else {
$nextlink = '<br />' . $sk->link(
$this->mTitle,
wfMsgHtml( 'nextdiff' ),
array(
'id' => 'differences-nextlink'
),
array(
'diff' => 'next',
'oldid' => $this->mNewid,
),
array(
'known',
'noclasses'
)
);
}
$header = "<div class=\"firstrevisionheader\" style=\"text-align: center\">" .
$sk->revUserTools( $this->mNewRev ) . "<br />" . $sk->revComment( $this->mNewRev ) . $nextlink . "</div>\n";
$wgOut->addHTML( $header );
$wgOut->setSubtitle( wfMsgExt( 'difference', array( 'parseinline' ) ) );
$wgOut->setRobotPolicy( 'noindex,nofollow' );
wfProfileOut( __METHOD__ );
}
/**
* Get the diff text, send it to $wgOut
* Returns false if the diff could not be generated, otherwise returns true
*/
function showDiff( $otitle, $ntitle, $notice = '' ) {
global $wgOut;
$diff = $this->getDiff( $otitle, $ntitle, $notice );
if ( $diff === false ) {
$wgOut->addWikiMsg( 'missing-article', "<nowiki>(fixme, bug)</nowiki>", '' );
return false;
} else {
$this->showDiffStyle();
$wgOut->addHTML( $diff );
return true;
}
}
/**
* Add style sheets and supporting JS for diff display.
*/
function showDiffStyle() {
global $wgOut;
$wgOut->addModuleStyles( 'mediawiki.legacy.diff' );
$wgOut->addModuleScripts( 'mediawiki.legacy.diff' );
}
/**
* Get complete diff table, including header
*
* @param $otitle Title: old title
* @param $ntitle Title: new title
* @param $notice String: HTML between diff header and body
* @return mixed
*/
function getDiff( $otitle, $ntitle, $notice = '' ) {
$body = $this->getDiffBody();
if ( $body === false ) {
return false;
} else {
$multi = $this->getMultiNotice();
return $this->addHeader( $body, $otitle, $ntitle, $multi, $notice );
}
}
/**
* Get the diff table body, without header
*
* @return mixed (string/false)
*/
public function getDiffBody() {
global $wgMemc;
wfProfileIn( __METHOD__ );
$this->mCacheHit = true;
// Check if the diff should be hidden from this user
if ( !$this->loadRevisionData() ) {
wfProfileOut( __METHOD__ );
return false;
} elseif ( $this->mOldRev && !$this->mOldRev->userCan( Revision::DELETED_TEXT ) ) {
wfProfileOut( __METHOD__ );
return false;
} elseif ( $this->mNewRev && !$this->mNewRev->userCan( Revision::DELETED_TEXT ) ) {
wfProfileOut( __METHOD__ );
return false;
}
// Short-circuit
if ( $this->mOldRev && $this->mNewRev
&& $this->mOldRev->getID() == $this->mNewRev->getID() )
{
wfProfileOut( __METHOD__ );
return '';
}
// Cacheable?
$key = false;
if ( $this->mOldid && $this->mNewid ) {
$key = wfMemcKey( 'diff', 'version', MW_DIFF_VERSION,
'oldid', $this->mOldid, 'newid', $this->mNewid );
// Try cache
if ( !$this->mRefreshCache ) {
$difftext = $wgMemc->get( $key );
if ( $difftext ) {
wfIncrStats( 'diff_cache_hit' );
$difftext = $this->localiseLineNumbers( $difftext );
$difftext .= "\n<!-- diff cache key $key -->\n";
wfProfileOut( __METHOD__ );
return $difftext;
}
} // don't try to load but save the result
}
$this->mCacheHit = false;
// Loadtext is permission safe, this just clears out the diff
if ( !$this->loadText() ) {
wfProfileOut( __METHOD__ );
return false;
}
$difftext = $this->generateDiffBody( $this->mOldtext, $this->mNewtext );
// Save to cache for 7 days
if ( !wfRunHooks( 'AbortDiffCache', array( &$this ) ) ) {
wfIncrStats( 'diff_uncacheable' );
} elseif ( $key !== false && $difftext !== false ) {
wfIncrStats( 'diff_cache_miss' );
$wgMemc->set( $key, $difftext, 7 * 86400 );
} else {
wfIncrStats( 'diff_uncacheable' );
}
// Replace line numbers with the text in the user's language
if ( $difftext !== false ) {
$difftext = $this->localiseLineNumbers( $difftext );
}
wfProfileOut( __METHOD__ );
return $difftext;
}
/**
* Make sure the proper modules are loaded before we try to
* make the diff
*/
private function initDiffEngines() {
global $wgExternalDiffEngine;
if ( $wgExternalDiffEngine == 'wikidiff' && !function_exists( 'wikidiff_do_diff' ) ) {
wfProfileIn( __METHOD__ . '-php_wikidiff.so' );
wfSuppressWarnings();
dl( 'php_wikidiff.so' );
wfRestoreWarnings();
wfProfileOut( __METHOD__ . '-php_wikidiff.so' );
}
else if ( $wgExternalDiffEngine == 'wikidiff2' && !function_exists( 'wikidiff2_do_diff' ) ) {
wfProfileIn( __METHOD__ . '-php_wikidiff2.so' );
wfSuppressWarnings();
wfDl( 'wikidiff2' );
wfRestoreWarnings();
wfProfileOut( __METHOD__ . '-php_wikidiff2.so' );
}
}
/**
* Generate a diff, no caching
*
* @param $otext String: old text, must be already segmented
* @param $ntext String: new text, must be already segmented
*/
function generateDiffBody( $otext, $ntext ) {
global $wgExternalDiffEngine, $wgContLang;
$otext = str_replace( "\r\n", "\n", $otext );
$ntext = str_replace( "\r\n", "\n", $ntext );
$this->initDiffEngines();
if ( $wgExternalDiffEngine == 'wikidiff' && function_exists( 'wikidiff_do_diff' ) ) {
# For historical reasons, external diff engine expects
# input text to be HTML-escaped already
$otext = htmlspecialchars ( $wgContLang->segmentForDiff( $otext ) );
$ntext = htmlspecialchars ( $wgContLang->segmentForDiff( $ntext ) );
return $wgContLang->unsegmentForDiff( wikidiff_do_diff( $otext, $ntext, 2 ) ) .
$this->debug( 'wikidiff1' );
}
if ( $wgExternalDiffEngine == 'wikidiff2' && function_exists( 'wikidiff2_do_diff' ) ) {
# Better external diff engine, the 2 may some day be dropped
# This one does the escaping and segmenting itself
wfProfileIn( 'wikidiff2_do_diff' );
$text = wikidiff2_do_diff( $otext, $ntext, 2 );
$text .= $this->debug( 'wikidiff2' );
wfProfileOut( 'wikidiff2_do_diff' );
return $text;
}
if ( $wgExternalDiffEngine != 'wikidiff3' && $wgExternalDiffEngine !== false ) {
# Diff via the shell
global $wgTmpDirectory;
$tempName1 = tempnam( $wgTmpDirectory, 'diff_' );
$tempName2 = tempnam( $wgTmpDirectory, 'diff_' );
$tempFile1 = fopen( $tempName1, "w" );
if ( !$tempFile1 ) {
wfProfileOut( __METHOD__ );
return false;
}
$tempFile2 = fopen( $tempName2, "w" );
if ( !$tempFile2 ) {
wfProfileOut( __METHOD__ );
return false;
}
fwrite( $tempFile1, $otext );
fwrite( $tempFile2, $ntext );
fclose( $tempFile1 );
fclose( $tempFile2 );
$cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
wfProfileIn( __METHOD__ . "-shellexec" );
$difftext = wfShellExec( $cmd );
$difftext .= $this->debug( "external $wgExternalDiffEngine" );
wfProfileOut( __METHOD__ . "-shellexec" );
unlink( $tempName1 );
unlink( $tempName2 );
wfProfileOut( __METHOD__ );
return $difftext;
}
# Native PHP diff
$ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
$nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
$diffs = new Diff( $ota, $nta );
$formatter = new TableDiffFormatter();
$difftext = $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) ) .
wfProfileOut( __METHOD__ );
return $difftext;
$this->debug();
}
/**
* Generate a debug comment indicating diff generating time,
* server node, and generator backend.
*/
protected function debug( $generator = "internal" ) {
global $wgShowHostnames;
if ( !$this->enableDebugComment ) {
return '';
}
$data = array( $generator );
if ( $wgShowHostnames ) {
$data[] = wfHostname();
}
$data[] = wfTimestamp( TS_DB );
return "<!-- diff generator: " .
implode( " ",
array_map(
"htmlspecialchars",
$data ) ) .
" -->\n";
}
/**
* Replace line numbers with the text in the user's language
*/
function localiseLineNumbers( $text ) {
return preg_replace_callback( '/<!--LINE (\d+)-->/',
array( &$this, 'localiseLineNumbersCb' ), $text );
}
function localiseLineNumbersCb( $matches ) {
global $wgLang;
if ( $matches[1] === '1' && $this->mReducedLineNumbers ) return '';
return wfMsgExt( 'lineno', 'escape', $wgLang->formatNum( $matches[1] ) );
}
/**
* If there are revisions between the ones being compared, return a note saying so.
* @return string
*/
function getMultiNotice() {
if ( !is_object( $this->mOldRev ) || !is_object( $this->mNewRev ) ) {
return '';
} elseif ( !$this->mOldPage->equals( $this->mNewPage ) ) {
// Comparing two different pages? Count would be meaningless.
return '';
}
$oldid = $this->mOldRev->getId();
$newid = $this->mNewRev->getId();
if ( $oldid > $newid ) {
$tmp = $oldid; $oldid = $newid; $newid = $tmp;
}
$nEdits = $this->mTitle->countRevisionsBetween( $oldid, $newid );
if ( $nEdits > 0 ) {
$limit = 100;
// We use ($limit + 1) so we can detect if there are > 100 authors
// in a given revision range. In that case, diff-multi-manyusers is used.
$numUsers = $this->mTitle->countAuthorsBetween( $oldid, $newid, $limit + 1 );
return self::intermediateEditsMsg( $nEdits, $numUsers, $limit );
}
return ''; // nothing
}
/**
* Get a notice about how many intermediate edits and users there are
* @param $numEdits int
* @param $numUsers int
* @param $limit int
* @return string
*/
public static function intermediateEditsMsg( $numEdits, $numUsers, $limit ) {
global $wgLang;
if ( $numUsers > $limit ) {
$msg = 'diff-multi-manyusers';
$numUsers = $limit;
} else {
$msg = 'diff-multi';
}
return wfMsgExt( $msg, 'parseinline',
$wgLang->formatnum( $numEdits ), $wgLang->formatnum( $numUsers ) );
}
/**
* Add the header to a diff body
*/
static function addHeader( $diff, $otitle, $ntitle, $multi = '', $notice = '' ) {
$header = "<table class='diff'>";
if ( $diff ) { // Safari/Chrome show broken output if cols not used
$header .= "
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />";
$colspan = 2;
$multiColspan = 4;
} else {
$colspan = 1;
$multiColspan = 2;
}
$header .= "
<tr valign='top'>
<td colspan='$colspan' class='diff-otitle'>{$otitle}</td>
<td colspan='$colspan' class='diff-ntitle'>{$ntitle}</td>
</tr>";
if ( $multi != '' ) {
$header .= "<tr><td colspan='{$multiColspan}' align='center' class='diff-multi'>{$multi}</td></tr>";
}
if ( $notice != '' ) {
$header .= "<tr><td colspan='{$multiColspan}' align='center'>{$notice}</td></tr>";
}
return $header . $diff . "</table>";
}
/**
* Use specified text instead of loading from the database
*/
function setText( $oldText, $newText ) {
$this->mOldtext = $oldText;
$this->mNewtext = $newText;
$this->mTextLoaded = 2;
$this->mRevisionsLoaded = true;
}
/**
* Load revision metadata for the specified articles. If newid is 0, then compare
* the old article in oldid to the current article; if oldid is 0, then
* compare the current article to the immediately previous one (ignoring the
* value of newid).
*
* If oldid is false, leave the corresponding revision object set
* to false. This is impossible via ordinary user input, and is provided for
* API convenience.
*/
function loadRevisionData() {
global $wgLang, $wgUser;
if ( $this->mRevisionsLoaded ) {
return true;
} else {
// Whether it succeeds or fails, we don't want to try again
$this->mRevisionsLoaded = true;
}
// Load the new revision object
$this->mNewRev = $this->mNewid
? Revision::newFromId( $this->mNewid )
: Revision::newFromTitle( $this->mTitle );
if ( !$this->mNewRev instanceof Revision )
return false;
// Update the new revision ID in case it was 0 (makes life easier doing UI stuff)
$this->mNewid = $this->mNewRev->getId();
// Check if page is editable
$editable = $this->mNewRev->getTitle()->userCan( 'edit' );
// Set assorted variables
$timestamp = $wgLang->timeanddate( $this->mNewRev->getTimestamp(), true );
$dateofrev = $wgLang->date( $this->mNewRev->getTimestamp(), true );
$timeofrev = $wgLang->time( $this->mNewRev->getTimestamp(), true );
$this->mNewPage = $this->mNewRev->getTitle();
if ( $this->mNewRev->isCurrent() ) {
$newLink = $this->mNewPage->escapeLocalUrl( array(
'oldid' => $this->mNewid
) );
$this->mPagetitle = htmlspecialchars( wfMsg(
'currentrev-asof',
$timestamp,
$dateofrev,
$timeofrev
) );
$newEdit = $this->mNewPage->escapeLocalUrl( array(
'action' => 'edit'
) );
$this->mNewtitle = "<a href='$newLink'>{$this->mPagetitle}</a>";
$this->mNewtitle .= " (<a href='$newEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
} else {
$newLink = $this->mNewPage->escapeLocalUrl( array(
'oldid' => $this->mNewid
) );
$newEdit = $this->mNewPage->escapeLocalUrl( array(
'action' => 'edit',
'oldid' => $this->mNewid
) );
$this->mPagetitle = htmlspecialchars( wfMsg(
'revisionasof',
$timestamp,
$dateofrev,
$timeofrev
) );
$this->mNewtitle = "<a href='$newLink'>{$this->mPagetitle}</a>";
$this->mNewtitle .= " (<a href='$newEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
}
if ( !$this->mNewRev->userCan( Revision::DELETED_TEXT ) ) {
$this->mNewtitle = "<span class='history-deleted'>{$this->mPagetitle}</span>";
} else if ( $this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
$this->mNewtitle = "<span class='history-deleted'>{$this->mNewtitle}</span>";
}
// Load the old revision object
$this->mOldRev = false;
if ( $this->mOldid ) {
$this->mOldRev = Revision::newFromId( $this->mOldid );
} elseif ( $this->mOldid === 0 ) {
$rev = $this->mNewRev->getPrevious();
if ( $rev ) {
$this->mOldid = $rev->getId();
$this->mOldRev = $rev;
} else {
// No previous revision; mark to show as first-version only.
$this->mOldid = false;
$this->mOldRev = false;
}
} /* elseif ( $this->mOldid === false ) leave mOldRev false; */
if ( is_null( $this->mOldRev ) ) {
return false;
}
if ( $this->mOldRev ) {
$this->mOldPage = $this->mOldRev->getTitle();
$t = $wgLang->timeanddate( $this->mOldRev->getTimestamp(), true );
$dateofrev = $wgLang->date( $this->mOldRev->getTimestamp(), true );
$timeofrev = $wgLang->time( $this->mOldRev->getTimestamp(), true );
$oldLink = $this->mOldPage->escapeLocalUrl( array(
'oldid' => $this->mOldid
) );
$oldEdit = $this->mOldPage->escapeLocalUrl( array(
'action' => 'edit',
'oldid' => $this->mOldid
) );
$this->mOldPagetitle = htmlspecialchars( wfMsg( 'revisionasof', $t, $dateofrev, $timeofrev ) );
$this->mOldtitle = "<a href='$oldLink'>{$this->mOldPagetitle}</a>"
. " (<a href='$oldEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
// Add an "undo" link
$newUndo = $this->mNewPage->escapeLocalUrl( array(
'action' => 'edit',
'undoafter' => $this->mOldid,
'undo' => $this->mNewid
) );
$htmlLink = htmlspecialchars( wfMsg( 'editundo' ) );
$htmlTitle = Xml::expandAttributes( array( 'title' => $wgUser->getSkin()->titleAttrib( 'undo' ) ) );
if ( $editable && !$this->mOldRev->isDeleted( Revision::DELETED_TEXT ) && !$this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
$this->mNewtitle .= " (<a href='$newUndo' $htmlTitle>" . $htmlLink . "</a>)";
}
if ( !$this->mOldRev->userCan( Revision::DELETED_TEXT ) ) {
$this->mOldtitle = '<span class="history-deleted">' . $this->mOldPagetitle . '</span>';
} else if ( $this->mOldRev->isDeleted( Revision::DELETED_TEXT ) ) {
$this->mOldtitle = '<span class="history-deleted">' . $this->mOldtitle . '</span>';
}
}
return true;
}
/**
* Load the text of the revisions, as well as revision data.
*/
function loadText() {
if ( $this->mTextLoaded == 2 ) {
return true;
} else {
// Whether it succeeds or fails, we don't want to try again
$this->mTextLoaded = 2;
}
if ( !$this->loadRevisionData() ) {
return false;
}
if ( $this->mOldRev ) {
$this->mOldtext = $this->mOldRev->getText( Revision::FOR_THIS_USER );
if ( $this->mOldtext === false ) {
return false;
}
}
if ( $this->mNewRev ) {
$this->mNewtext = $this->mNewRev->getText( Revision::FOR_THIS_USER );
if ( $this->mNewtext === false ) {
return false;
}
}
return true;
}
/**
* Load the text of the new revision, not the old one
*/
function loadNewText() {
if ( $this->mTextLoaded >= 1 ) {
return true;
} else {
$this->mTextLoaded = 1;
}
if ( !$this->loadRevisionData() ) {
return false;
}
$this->mNewtext = $this->mNewRev->getText( Revision::FOR_THIS_USER );
return true;
}
}
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