includes/Linker.php

   1 <?php
   2 /**
   3  * Methods to make links and related items.
   4  *
   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.
   9  *
  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.
  14  *
  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
  19  *
  20  * @file
  21  */
  22 use MediaWiki\Linker\LinkTarget;
  23 use MediaWiki\MediaWikiServices;
  24
  25 /**
  26  * Some internal bits split of from Skin.php. These functions are used
  27  * for primarily page content: links, embedded images, table of contents. Links
  28  * are also used in the skin.
  29  *
  30  * @todo turn this into a legacy interface for HtmlPageLinkRenderer and similar services.
  31  *
  32  * @ingroup Skins
  33  */
  34 class Linker {
  35         /**
  36          * Flags for userToolLinks()
  37          */
  38         const TOOL_LINKS_NOBLOCK = 1;
  39         const TOOL_LINKS_EMAIL = 2;
  40
  41         /**
  42          * This function returns an HTML link to the given target.  It serves a few
  43          * purposes:
  44          *   1) If $target is a Title, the correct URL to link to will be figured
  45          *      out automatically.
  46          *   2) It automatically adds the usual classes for various types of link
  47          *      targets: "new" for red links, "stub" for short articles, etc.
  48          *   3) It escapes all attribute values safely so there's no risk of XSS.
  49          *   4) It provides a default tooltip if the target is a Title (the page
  50          *      name of the target).
  51          * link() replaces the old functions in the makeLink() family.
  52          *
  53          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
  54          * @deprecated since 1.28, use MediaWiki\Linker\LinkRenderer instead
  55          *
  56          * @param LinkTarget $target Can currently only be a LinkTarget, but this may
  57          *   change to support Images, literal URLs, etc.
  58          * @param string $html The HTML contents of the <a> element, i.e.,
  59          *   the link text.  This is raw HTML and will not be escaped.  If null,
  60          *   defaults to the prefixed text of the Title; or if the Title is just a
  61          *   fragment, the contents of the fragment.
  62          * @param array $customAttribs A key => value array of extra HTML attributes,
  63          *   such as title and class.  (href is ignored.)  Classes will be
  64          *   merged with the default classes, while other attributes will replace
  65          *   default attributes.  All passed attribute values will be HTML-escaped.
  66          *   A false attribute value means to suppress that attribute.
  67          * @param array $query The query string to append to the URL
  68          *   you're linking to, in key => value array form.  Query keys and values
  69          *   will be URL-encoded.
  70          * @param string|array $options String or array of strings:
  71          *     'known': Page is known to exist, so don't check if it does.
  72          *     'broken': Page is known not to exist, so don't check if it does.
  73          *     'noclasses': Don't add any classes automatically (includes "new",
  74          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
  75          *       provided, if any, so you get a simple blue link with no funny i-
  76          *       cons.
  77          *     'forcearticlepath': Use the article path always, even with a querystring.
  78          *       Has compatibility issues on some setups, so avoid wherever possible.
  79          *     'http': Force a full URL with http:// as the scheme.
  80          *     'https': Force a full URL with https:// as the scheme.
  81          *     'stubThreshold' => (int): Stub threshold to use when determining link classes.
  82          * @return string HTML <a> attribute
  83          */
  84         public static function link(
  85                 $target, $html = null, $customAttribs = [], $query = [], $options = []
  86         ) {
  87                 if ( !$target instanceof LinkTarget ) {
  88                         wfWarn( __METHOD__ . ': Requires $target to be a LinkTarget object.', 2 );
  89                         return "<!-- ERROR -->$html";
  90                 }
  91
  92                 if ( is_string( $query ) ) {
  93                         // some functions withing core using this still hand over query strings
  94                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
  95                         $query = wfCgiToArray( $query );
  96                 }
  97
  98                 $services = MediaWikiServices::getInstance();
  99                 $options = (array)$options;
 100                 if ( $options ) {
 101                         // Custom options, create new LinkRenderer
 102                         if ( !isset( $options['stubThreshold'] ) ) {
 103                                 $defaultLinkRenderer = $services->getLinkRenderer();
 104                                 $options['stubThreshold'] = $defaultLinkRenderer->getStubThreshold();
 105                         }
 106                         $linkRenderer = $services->getLinkRendererFactory()
 107                                 ->createFromLegacyOptions( $options );
 108                 } else {
 109                         $linkRenderer = $services->getLinkRenderer();
 110                 }
 111
 112                 if ( $html !== null ) {
 113                         $text = new HtmlArmor( $html );
 114                 } else {
 115                         $text = $html; // null
 116                 }
 117                 if ( in_array( 'known', $options, true ) ) {
 118                         return $linkRenderer->makeKnownLink( $target, $text, $customAttribs, $query );
 119                 } elseif ( in_array( 'broken', $options, true ) ) {
 120                         return $linkRenderer->makeBrokenLink( $target, $text, $customAttribs, $query );
 121                 } elseif ( in_array( 'noclasses', $options, true ) ) {
 122                         return $linkRenderer->makePreloadedLink( $target, $text, '', $customAttribs, $query );
 123                 } else {
 124                         return $linkRenderer->makeLink( $target, $text, $customAttribs, $query );
 125                 }
 126         }
 127
 128         /**
 129          * Identical to link(), except $options defaults to 'known'.
 130          *
 131          * @since 1.16.3
 132          * @deprecated since 1.28, use MediaWiki\Linker\LinkRenderer instead
 133          * @see Linker::link
 134          * @param Title $target
 135          * @param string $html
 136          * @param array $customAttribs
 137          * @param array $query
 138          * @param string|array $options
 139          * @return string
 140          */
 141         public static function linkKnown(
 142                 $target, $html = null, $customAttribs = [],
 143                 $query = [], $options = [ 'known' ]
 144         ) {
 145                 return self::link( $target, $html, $customAttribs, $query, $options );
 146         }
 147
 148         /**
 149          * Make appropriate markup for a link to the current article. This is since
 150          * MediaWiki 1.29.0 rendered as an <a> tag without an href and with a class
 151          * showing the link text. The calling sequence is the same as for the other
 152          * make*LinkObj static functions, but $query is not used.
 153          *
 154          * @since 1.16.3
 155          * @param Title $nt
 156          * @param string $html [optional]
 157          * @param string $query [optional]
 158          * @param string $trail [optional]
 159          * @param string $prefix [optional]
 160          *
 161          * @return string
 162          */
 163         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 164                 $ret = "<a class=\"mw-selflink selflink\">{$prefix}{$html}</a>{$trail}";
 165                 if ( !Hooks::run( 'SelfLinkBegin', [ $nt, &$html, &$trail, &$prefix, &$ret ] ) ) {
 166                         return $ret;
 167                 }
 168
 169                 if ( $html == '' ) {
 170                         $html = htmlspecialchars( $nt->getPrefixedText() );
 171                 }
 172                 list( $inside, $trail ) = self::splitTrail( $trail );
 173                 return "<a class=\"mw-selflink selflink\">{$prefix}{$html}{$inside}</a>{$trail}";
 174         }
 175
 176         /**
 177          * Get a message saying that an invalid title was encountered.
 178          * This should be called after a method like Title::makeTitleSafe() returned
 179          * a value indicating that the title object is invalid.
 180          *
 181          * @param IContextSource $context Context to use to get the messages
 182          * @param int $namespace Namespace number
 183          * @param string $title Text of the title, without the namespace part
 184          * @return string
 185          */
 186         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 187                 // First we check whether the namespace exists or not.
 188                 if ( MWNamespace::exists( $namespace ) ) {
 189                         if ( $namespace == NS_MAIN ) {
 190                                 $name = $context->msg( 'blanknamespace' )->text();
 191                         } else {
 192                                 $name = MediaWikiServices::getInstance()->getContentLanguage()->
 193                                         getFormattedNsText( $namespace );
 194                         }
 195                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 196                 } else {
 197                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 198                 }
 199         }
 200
 201         /**
 202          * @since 1.16.3
 203          * @param LinkTarget $target
 204          * @return LinkTarget
 205          */
 206         public static function normaliseSpecialPage( LinkTarget $target ) {
 207                 if ( $target->getNamespace() == NS_SPECIAL && !$target->isExternal() ) {
 208                         list( $name, $subpage ) = MediaWikiServices::getInstance()->getSpecialPageFactory()->
 209                                 resolveAlias( $target->getDBkey() );
 210                         if ( !$name ) {
 211                                 return $target;
 212                         }
 213                         $ret = SpecialPage::getTitleValueFor( $name, $subpage, $target->getFragment() );
 214                         return $ret;
 215                 } else {
 216                         return $target;
 217                 }
 218         }
 219
 220         /**
 221          * Returns the filename part of an url.
 222          * Used as alternative text for external images.
 223          *
 224          * @param string $url
 225          *
 226          * @return string
 227          */
 228         private static function fnamePart( $url ) {
 229                 $basename = strrchr( $url, '/' );
 230                 if ( false === $basename ) {
 231                         $basename = $url;
 232                 } else {
 233                         $basename = substr( $basename, 1 );
 234                 }
 235                 return $basename;
 236         }
 237
 238         /**
 239          * Return the code for images which were added via external links,
 240          * via Parser::maybeMakeExternalImage().
 241          *
 242          * @since 1.16.3
 243          * @param string $url
 244          * @param string $alt
 245          *
 246          * @return string
 247          */
 248         public static function makeExternalImage( $url, $alt = '' ) {
 249                 if ( $alt == '' ) {
 250                         $alt = self::fnamePart( $url );
 251                 }
 252                 $img = '';
 253                 $success = Hooks::run( 'LinkerMakeExternalImage', [ &$url, &$alt, &$img ] );
 254                 if ( !$success ) {
 255                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 256                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 257                         return $img;
 258                 }
 259                 return Html::element( 'img',
 260                         [
 261                                 'src' => $url,
 262                                 'alt' => $alt ] );
 263         }
 264
 265         /**
 266          * Given parameters derived from [[Image:Foo|options...]], generate the
 267          * HTML that that syntax inserts in the page.
 268          *
 269          * @param Parser $parser
 270          * @param Title $title Title object of the file (not the currently viewed page)
 271          * @param File $file File object, or false if it doesn't exist
 272          * @param array $frameParams Associative array of parameters external to the media handler.
 273          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 274          *     will often be false.
 275          *          thumbnail       If present, downscale and frame
 276          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 277          *          framed          Shows image in original size in a frame
 278          *          frameless       Downscale but don't frame
 279          *          upright         If present, tweak default sizes for portrait orientation
 280          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 281          *          border          If present, show a border around the image
 282          *          align           Horizontal alignment (left, right, center, none)
 283          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 284          *                          bottom, text-bottom)
 285          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 286          *          class           HTML for image classes. Plain text.
 287          *          caption         HTML for image caption.
 288          *          link-url        URL to link to
 289          *          link-title      Title object to link to
 290          *          link-target     Value for the target attribute, only with link-url
 291          *          no-link         Boolean, suppress description link
 292          *          targetlang      (optional) Target language code, see Parser::getTargetLanguage()
 293          *
 294          * @param array $handlerParams Associative array of media handler parameters, to be passed
 295          *       to transform(). Typical keys are "width" and "page".
 296          * @param string|bool $time Timestamp of the file, set as false for current
 297          * @param string $query Query params for desc url
 298          * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
 299          * @since 1.20
 300          * @return string HTML for an image, with links, wrappers, etc.
 301          */
 302         public static function makeImageLink( Parser $parser, Title $title,
 303                 $file, $frameParams = [], $handlerParams = [], $time = false,
 304                 $query = "", $widthOption = null
 305         ) {
 306                 $res = null;
 307                 $dummy = new DummyLinker;
 308                 if ( !Hooks::run( 'ImageBeforeProduceHTML', [ &$dummy, &$title,
 309                         &$file, &$frameParams, &$handlerParams, &$time, &$res,
 310                         $parser, &$query, &$widthOption
 311                 ] ) ) {
 312                         return $res;
 313                 }
 314
 315                 if ( $file && !$file->allowInlineDisplay() ) {
 316                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 317                         return self::link( $title );
 318                 }
 319
 320                 // Clean up parameters
 321                 $page = $handlerParams['page'] ?? false;
 322                 if ( !isset( $frameParams['align'] ) ) {
 323                         $frameParams['align'] = '';
 324                 }
 325                 if ( !isset( $frameParams['alt'] ) ) {
 326                         $frameParams['alt'] = '';
 327                 }
 328                 if ( !isset( $frameParams['title'] ) ) {
 329                         $frameParams['title'] = '';
 330                 }
 331                 if ( !isset( $frameParams['class'] ) ) {
 332                         $frameParams['class'] = '';
 333                 }
 334
 335                 $prefix = $postfix = '';
 336
 337                 if ( 'center' == $frameParams['align'] ) {
 338                         $prefix = '<div class="center">';
 339                         $postfix = '</div>';
 340                         $frameParams['align'] = 'none';
 341                 }
 342                 if ( $file && !isset( $handlerParams['width'] ) ) {
 343                         if ( isset( $handlerParams['height'] ) && $file->isVectorized() ) {
 344                                 // If its a vector image, and user only specifies height
 345                                 // we don't want it to be limited by its "normal" width.
 346                                 global $wgSVGMaxSize;
 347                                 $handlerParams['width'] = $wgSVGMaxSize;
 348                         } else {
 349                                 $handlerParams['width'] = $file->getWidth( $page );
 350                         }
 351
 352                         if ( isset( $frameParams['thumbnail'] )
 353                                 || isset( $frameParams['manualthumb'] )
 354                                 || isset( $frameParams['framed'] )
 355                                 || isset( $frameParams['frameless'] )
 356                                 || !$handlerParams['width']
 357                         ) {
 358                                 global $wgThumbLimits, $wgThumbUpright;
 359
 360                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 361                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 362                                 }
 363
 364                                 // Reduce width for upright images when parameter 'upright' is used
 365                                 if ( isset( $frameParams['upright'] ) && $frameParams['upright'] == 0 ) {
 366                                         $frameParams['upright'] = $wgThumbUpright;
 367                                 }
 368
 369                                 // For caching health: If width scaled down due to upright
 370                                 // parameter, round to full __0 pixel to avoid the creation of a
 371                                 // lot of odd thumbs.
 372                                 $prefWidth = isset( $frameParams['upright'] ) ?
 373                                         round( $wgThumbLimits[$widthOption] * $frameParams['upright'], -1 ) :
 374                                         $wgThumbLimits[$widthOption];
 375
 376                                 // Use width which is smaller: real image width or user preference width
 377                                 // Unless image is scalable vector.
 378                                 if ( !isset( $handlerParams['height'] ) && ( $handlerParams['width'] <= 0 ||
 379                                                 $prefWidth < $handlerParams['width'] || $file->isVectorized() ) ) {
 380                                         $handlerParams['width'] = $prefWidth;
 381                                 }
 382                         }
 383                 }
 384
 385                 if ( isset( $frameParams['thumbnail'] ) || isset( $frameParams['manualthumb'] )
 386                         || isset( $frameParams['framed'] )
 387                 ) {
 388                         # Create a thumbnail. Alignment depends on the writing direction of
 389                         # the page content language (right-aligned for LTR languages,
 390                         # left-aligned for RTL languages)
 391                         # If a thumbnail width has not been provided, it is set
 392                         # to the default user option as specified in Language*.php
 393                         if ( $frameParams['align'] == '' ) {
 394                                 $frameParams['align'] = $parser->getTargetLanguage()->alignEnd();
 395                         }
 396                         return $prefix .
 397                                 self::makeThumbLink2( $title, $file, $frameParams, $handlerParams, $time, $query ) .
 398                                 $postfix;
 399                 }
 400
 401                 if ( $file && isset( $frameParams['frameless'] ) ) {
 402                         $srcWidth = $file->getWidth( $page );
 403                         # For "frameless" option: do not present an image bigger than the
 404                         # source (for bitmap-style images). This is the same behavior as the
 405                         # "thumb" option does it already.
 406                         if ( $srcWidth && !$file->mustRender() && $handlerParams['width'] > $srcWidth ) {
 407                                 $handlerParams['width'] = $srcWidth;
 408                         }
 409                 }
 410
 411                 if ( $file && isset( $handlerParams['width'] ) ) {
 412                         # Create a resized image, without the additional thumbnail features
 413                         $thumb = $file->transform( $handlerParams );
 414                 } else {
 415                         $thumb = false;
 416                 }
 417
 418                 if ( !$thumb ) {
 419                         $s = self::makeBrokenImageLinkObj( $title, $frameParams['title'], '', '', '', $time == true );
 420                 } else {
 421                         self::processResponsiveImages( $file, $thumb, $handlerParams );
 422                         $params = [
 423                                 'alt' => $frameParams['alt'],
 424                                 'title' => $frameParams['title'],
 425                                 'valign' => $frameParams['valign'] ?? false,
 426                                 'img-class' => $frameParams['class'] ];
 427                         if ( isset( $frameParams['border'] ) ) {
 428                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 429                         }
 430                         $params = self::getImageLinkMTOParams( $frameParams, $query, $parser ) + $params;
 431
 432                         $s = $thumb->toHtml( $params );
 433                 }
 434                 if ( $frameParams['align'] != '' ) {
 435                         $s = Html::rawElement(
 436                                 'div',
 437                                 [ 'class' => 'float' . $frameParams['align'] ],
 438                                 $s
 439                         );
 440                 }
 441                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 442         }
 443
 444         /**
 445          * Get the link parameters for MediaTransformOutput::toHtml() from given
 446          * frame parameters supplied by the Parser.
 447          * @param array $frameParams The frame parameters
 448          * @param string $query An optional query string to add to description page links
 449          * @param Parser|null $parser
 450          * @return array
 451          */
 452         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 453                 $mtoParams = [];
 454                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 455                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 456                         if ( isset( $frameParams['link-target'] ) ) {
 457                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 458                         }
 459                         if ( $parser ) {
 460                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 461                                 foreach ( $extLinkAttrs as $name => $val ) {
 462                                         // Currently could include 'rel' and 'target'
 463                                         $mtoParams['parser-extlink-' . $name] = $val;
 464                                 }
 465                         }
 466                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 467                         $mtoParams['custom-title-link'] = Title::newFromLinkTarget(
 468                                 self::normaliseSpecialPage( $frameParams['link-title'] )
 469                         );
 470                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 471                         // No link
 472                 } else {
 473                         $mtoParams['desc-link'] = true;
 474                         $mtoParams['desc-query'] = $query;
 475                 }
 476                 return $mtoParams;
 477         }
 478
 479         /**
 480          * Make HTML for a thumbnail including image, border and caption
 481          * @param Title $title
 482          * @param File|bool $file File object or false if it doesn't exist
 483          * @param string $label
 484          * @param string $alt
 485          * @param string $align
 486          * @param array $params
 487          * @param bool $framed
 488          * @param string $manualthumb
 489          * @return string
 490          */
 491         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt = '',
 492                 $align = 'right', $params = [], $framed = false, $manualthumb = ""
 493         ) {
 494                 $frameParams = [
 495                         'alt' => $alt,
 496                         'caption' => $label,
 497                         'align' => $align
 498                 ];
 499                 if ( $framed ) {
 500                         $frameParams['framed'] = true;
 501                 }
 502                 if ( $manualthumb ) {
 503                         $frameParams['manualthumb'] = $manualthumb;
 504                 }
 505                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 506         }
 507
 508         /**
 509          * @param Title $title
 510          * @param File $file
 511          * @param array $frameParams
 512          * @param array $handlerParams
 513          * @param bool $time
 514          * @param string $query
 515          * @return string
 516          */
 517         public static function makeThumbLink2( Title $title, $file, $frameParams = [],
 518                 $handlerParams = [], $time = false, $query = ""
 519         ) {
 520                 $exists = $file && $file->exists();
 521
 522                 $page = $handlerParams['page'] ?? false;
 523                 if ( !isset( $frameParams['align'] ) ) {
 524                         $frameParams['align'] = 'right';
 525                 }
 526                 if ( !isset( $frameParams['alt'] ) ) {
 527                         $frameParams['alt'] = '';
 528                 }
 529                 if ( !isset( $frameParams['title'] ) ) {
 530                         $frameParams['title'] = '';
 531                 }
 532                 if ( !isset( $frameParams['caption'] ) ) {
 533                         $frameParams['caption'] = '';
 534                 }
 535
 536                 if ( empty( $handlerParams['width'] ) ) {
 537                         // Reduce width for upright images when parameter 'upright' is used
 538                         $handlerParams['width'] = isset( $frameParams['upright'] ) ? 130 : 180;
 539                 }
 540                 $thumb = false;
 541                 $noscale = false;
 542                 $manualthumb = false;
 543
 544                 if ( !$exists ) {
 545                         $outerWidth = $handlerParams['width'] + 2;
 546                 } else {
 547                         if ( isset( $frameParams['manualthumb'] ) ) {
 548                                 # Use manually specified thumbnail
 549                                 $manual_title = Title::makeTitleSafe( NS_FILE, $frameParams['manualthumb'] );
 550                                 if ( $manual_title ) {
 551                                         $manual_img = wfFindFile( $manual_title );
 552                                         if ( $manual_img ) {
 553                                                 $thumb = $manual_img->getUnscaledThumb( $handlerParams );
 554                                                 $manualthumb = true;
 555                                         } else {
 556                                                 $exists = false;
 557                                         }
 558                                 }
 559                         } elseif ( isset( $frameParams['framed'] ) ) {
 560                                 // Use image dimensions, don't scale
 561                                 $thumb = $file->getUnscaledThumb( $handlerParams );
 562                                 $noscale = true;
 563                         } else {
 564                                 # Do not present an image bigger than the source, for bitmap-style images
 565                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 566                                 $srcWidth = $file->getWidth( $page );
 567                                 if ( $srcWidth && !$file->mustRender() && $handlerParams['width'] > $srcWidth ) {
 568                                         $handlerParams['width'] = $srcWidth;
 569                                 }
 570                                 $thumb = $file->transform( $handlerParams );
 571                         }
 572
 573                         if ( $thumb ) {
 574                                 $outerWidth = $thumb->getWidth() + 2;
 575                         } else {
 576                                 $outerWidth = $handlerParams['width'] + 2;
 577                         }
 578                 }
 579
 580                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 581                 # So we don't need to pass it here in $query. However, the URL for the
 582                 # zoom icon still needs it, so we make a unique query for it. See T16771
 583                 $url = $title->getLocalURL( $query );
 584                 if ( $page ) {
 585                         $url = wfAppendQuery( $url, [ 'page' => $page ] );
 586                 }
 587                 if ( $manualthumb
 588                         && !isset( $frameParams['link-title'] )
 589                         && !isset( $frameParams['link-url'] )
 590                         && !isset( $frameParams['no-link'] ) ) {
 591                         $frameParams['link-url'] = $url;
 592                 }
 593
 594                 $s = "<div class=\"thumb t{$frameParams['align']}\">"
 595                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 596
 597                 if ( !$exists ) {
 598                         $s .= self::makeBrokenImageLinkObj( $title, $frameParams['title'], '', '', '', $time == true );
 599                         $zoomIcon = '';
 600                 } elseif ( !$thumb ) {
 601                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 602                         $zoomIcon = '';
 603                 } else {
 604                         if ( !$noscale && !$manualthumb ) {
 605                                 self::processResponsiveImages( $file, $thumb, $handlerParams );
 606                         }
 607                         $params = [
 608                                 'alt' => $frameParams['alt'],
 609                                 'title' => $frameParams['title'],
 610                                 'img-class' => ( isset( $frameParams['class'] ) && $frameParams['class'] !== ''
 611                                         ? $frameParams['class'] . ' '
 612                                         : '' ) . 'thumbimage'
 613                         ];
 614                         $params = self::getImageLinkMTOParams( $frameParams, $query ) + $params;
 615                         $s .= $thumb->toHtml( $params );
 616                         if ( isset( $frameParams['framed'] ) ) {
 617                                 $zoomIcon = "";
 618                         } else {
 619                                 $zoomIcon = Html::rawElement( 'div', [ 'class' => 'magnify' ],
 620                                         Html::rawElement( 'a', [
 621                                                 'href' => $url,
 622                                                 'class' => 'internal',
 623                                                 'title' => wfMessage( 'thumbnail-more' )->text() ],
 624                                                 "" ) );
 625                         }
 626                 }
 627                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $frameParams['caption'] . "</div></div></div>";
 628                 return str_replace( "\n", ' ', $s );
 629         }
 630
 631         /**
 632          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 633          * applicable.
 634          *
 635          * @param File $file
 636          * @param MediaTransformOutput $thumb
 637          * @param array $hp Image parameters
 638          */
 639         public static function processResponsiveImages( $file, $thumb, $hp ) {
 640                 global $wgResponsiveImages;
 641                 if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
 642                         $hp15 = $hp;
 643                         $hp15['width'] = round( $hp['width'] * 1.5 );
 644                         $hp20 = $hp;
 645                         $hp20['width'] = $hp['width'] * 2;
 646                         if ( isset( $hp['height'] ) ) {
 647                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 648                                 $hp20['height'] = $hp['height'] * 2;
 649                         }
 650
 651                         $thumb15 = $file->transform( $hp15 );
 652                         $thumb20 = $file->transform( $hp20 );
 653                         if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
 654                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 655                         }
 656                         if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
 657                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 658                         }
 659                 }
 660         }
 661
 662         /**
 663          * Make a "broken" link to an image
 664          *
 665          * @since 1.16.3
 666          * @param Title $title
 667          * @param string $label Link label (plain text)
 668          * @param string $query Query string
 669          * @param string $unused1 Unused parameter kept for b/c
 670          * @param string $unused2 Unused parameter kept for b/c
 671          * @param bool $time A file of a certain timestamp was requested
 672          * @return string
 673          */
 674         public static function makeBrokenImageLinkObj( $title, $label = '',
 675                 $query = '', $unused1 = '', $unused2 = '', $time = false
 676         ) {
 677                 if ( !$title instanceof Title ) {
 678                         wfWarn( __METHOD__ . ': Requires $title to be a Title object.' );
 679                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 680                 }
 681
 682                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 683                 if ( $label == '' ) {
 684                         $label = $title->getPrefixedText();
 685                 }
 686                 $encLabel = htmlspecialchars( $label );
 687                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 688
 689                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 690                         && !$currentExists
 691                 ) {
 692                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 693
 694                         if ( $redir ) {
 695                                 // We already know it's a redirect, so mark it
 696                                 // accordingly
 697                                 return self::link(
 698                                         $title,
 699                                         $encLabel,
 700                                         [ 'class' => 'mw-redirect' ],
 701                                         wfCgiToArray( $query ),
 702                                         [ 'known', 'noclasses' ]
 703                                 );
 704                         }
 705
 706                         $href = self::getUploadUrl( $title, $query );
 707
 708                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 709                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 710                                 $encLabel . '</a>';
 711                 }
 712
 713                 return self::link( $title, $encLabel, [], wfCgiToArray( $query ), [ 'known', 'noclasses' ] );
 714         }
 715
 716         /**
 717          * Get the URL to upload a certain file
 718          *
 719          * @since 1.16.3
 720          * @param Title $destFile Title object of the file to upload
 721          * @param string $query Urlencoded query string to prepend
 722          * @return string Urlencoded URL
 723          */
 724         protected static function getUploadUrl( $destFile, $query = '' ) {
 725                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 726                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 727                 if ( $query != '' ) {
 728                         $q .= '&' . $query;
 729                 }
 730
 731                 if ( $wgUploadMissingFileUrl ) {
 732                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 733                 } elseif ( $wgUploadNavigationUrl ) {
 734                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 735                 } else {
 736                         $upload = SpecialPage::getTitleFor( 'Upload' );
 737                         return $upload->getLocalURL( $q );
 738                 }
 739         }
 740
 741         /**
 742          * Create a direct link to a given uploaded file.
 743          *
 744          * @since 1.16.3
 745          * @param Title $title
 746          * @param string $html Pre-sanitized HTML
 747          * @param string $time MW timestamp of file creation time
 748          * @return string HTML
 749          */
 750         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 751                 $img = wfFindFile( $title, [ 'time' => $time ] );
 752                 return self::makeMediaLinkFile( $title, $img, $html );
 753         }
 754
 755         /**
 756          * Create a direct link to a given uploaded file.
 757          * This will make a broken link if $file is false.
 758          *
 759          * @since 1.16.3
 760          * @param Title $title
 761          * @param File|bool $file File object or false
 762          * @param string $html Pre-sanitized HTML
 763          * @return string HTML
 764          *
 765          * @todo Handle invalid or missing images better.
 766          */
 767         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
 768                 if ( $file && $file->exists() ) {
 769                         $url = $file->getUrl();
 770                         $class = 'internal';
 771                 } else {
 772                         $url = self::getUploadUrl( $title );
 773                         $class = 'new';
 774                 }
 775
 776                 $alt = $title->getText();
 777                 if ( $html == '' ) {
 778                         $html = $alt;
 779                 }
 780
 781                 $ret = '';
 782                 $attribs = [
 783                         'href' => $url,
 784                         'class' => $class,
 785                         'title' => $alt
 786                 ];
 787
 788                 if ( !Hooks::run( 'LinkerMakeMediaLinkFile',
 789                         [ $title, $file, &$html, &$attribs, &$ret ] ) ) {
 790                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
 791                                 . "with url {$url} and text {$html} to {$ret}\n", true );
 792                         return $ret;
 793                 }
 794
 795                 return Html::rawElement( 'a', $attribs, $html );
 796         }
 797
 798         /**
 799          * Make a link to a special page given its name and, optionally,
 800          * a message key from the link text.
 801          * Usage example: Linker::specialLink( 'Recentchanges' )
 802          *
 803          * @since 1.16.3
 804          * @param string $name
 805          * @param string $key
 806          * @return string
 807          */
 808         public static function specialLink( $name, $key = '' ) {
 809                 if ( $key == '' ) {
 810                         $key = strtolower( $name );
 811                 }
 812
 813                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->escaped() );
 814         }
 815
 816         /**
 817          * Make an external link
 818          * @since 1.16.3. $title added in 1.21
 819          * @param string $url URL to link to
 820          * @param string $text Text of link
 821          * @param bool $escape Do we escape the link text?
 822          * @param string $linktype Type of external link. Gets added to the classes
 823          * @param array $attribs Array of extra attributes to <a>
 824          * @param Title|null $title Title object used for title specific link attributes
 825          * @return string
 826          */
 827         public static function makeExternalLink( $url, $text, $escape = true,
 828                 $linktype = '', $attribs = [], $title = null
 829         ) {
 830                 global $wgTitle;
 831                 $class = "external";
 832                 if ( $linktype ) {
 833                         $class .= " $linktype";
 834                 }
 835                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
 836                         $class .= " {$attribs['class']}";
 837                 }
 838                 $attribs['class'] = $class;
 839
 840                 if ( $escape ) {
 841                         $text = htmlspecialchars( $text );
 842                 }
 843
 844                 if ( !$title ) {
 845                         $title = $wgTitle;
 846                 }
 847                 $newRel = Parser::getExternalLinkRel( $url, $title );
 848                 if ( !isset( $attribs['rel'] ) || $attribs['rel'] === '' ) {
 849                         $attribs['rel'] = $newRel;
 850                 } elseif ( $newRel !== '' ) {
 851                         // Merge the rel attributes.
 852                         $newRels = explode( ' ', $newRel );
 853                         $oldRels = explode( ' ', $attribs['rel'] );
 854                         $combined = array_unique( array_merge( $newRels, $oldRels ) );
 855                         $attribs['rel'] = implode( ' ', $combined );
 856                 }
 857                 $link = '';
 858                 $success = Hooks::run( 'LinkerMakeExternalLink',
 859                         [ &$url, &$text, &$link, &$attribs, $linktype ] );
 860                 if ( !$success ) {
 861                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
 862                                 . "with url {$url} and text {$text} to {$link}\n", true );
 863                         return $link;
 864                 }
 865                 $attribs['href'] = $url;
 866                 return Html::rawElement( 'a', $attribs, $text );
 867         }
 868
 869         /**
 870          * Make user link (or user contributions for unregistered users)
 871          * @param int $userId User id in database.
 872          * @param string $userName User name in database.
 873          * @param string $altUserName Text to display instead of the user name (optional)
 874          * @return string HTML fragment
 875          * @since 1.16.3. $altUserName was added in 1.19.
 876          */
 877         public static function userLink( $userId, $userName, $altUserName = false ) {
 878                 $classes = 'mw-userlink';
 879                 $page = null;
 880                 if ( $userId == 0 ) {
 881                         $page = ExternalUserNames::getUserLinkTitle( $userName );
 882
 883                         if ( ExternalUserNames::isExternal( $userName ) ) {
 884                                 $classes .= ' mw-extuserlink';
 885                         } elseif ( $altUserName === false ) {
 886                                 $altUserName = IP::prettifyIP( $userName );
 887                         }
 888                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (T45179)
 889                 } else {
 890                         $page = Title::makeTitle( NS_USER, $userName );
 891                 }
 892
 893                 // Wrap the output with <bdi> tags for directionality isolation
 894                 $linkText =
 895                         '<bdi>' . htmlspecialchars( $altUserName !== false ? $altUserName : $userName ) . '</bdi>';
 896
 897                 return $page
 898                         ? self::link( $page, $linkText, [ 'class' => $classes ] )
 899                         : Html::rawElement( 'span', [ 'class' => $classes ], $linkText );
 900         }
 901
 902         /**
 903          * Generate standard user tool links (talk, contributions, block link, etc.)
 904          *
 905          * @since 1.16.3
 906          * @param int $userId User identifier
 907          * @param string $userText User name or IP address
 908          * @param bool $redContribsWhenNoEdits Should the contributions link be
 909          *   red if the user has no edits?
 910          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
 911          *   and Linker::TOOL_LINKS_EMAIL).
 912          * @param int|null $edits User edit count (optional, for performance)
 913          * @return string HTML fragment
 914          */
 915         public static function userToolLinks(
 916                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
 917         ) {
 918                 global $wgUser, $wgDisableAnonTalk, $wgLang;
 919                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
 920                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
 921                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
 922
 923                 if ( $userId == 0 && ExternalUserNames::isExternal( $userText ) ) {
 924                         // No tools for an external user
 925                         return '';
 926                 }
 927
 928                 $items = [];
 929                 if ( $talkable ) {
 930                         $items[] = self::userTalkLink( $userId, $userText );
 931                 }
 932                 if ( $userId ) {
 933                         // check if the user has an edit
 934                         $attribs = [];
 935                         $attribs['class'] = 'mw-usertoollinks-contribs';
 936                         if ( $redContribsWhenNoEdits ) {
 937                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
 938                                         $user = User::newFromId( $userId );
 939                                         $edits = $user->getEditCount();
 940                                 }
 941                                 if ( $edits === 0 ) {
 942                                         $attribs['class'] .= ' new';
 943                                 }
 944                         }
 945                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
 946
 947                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
 948                 }
 949                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
 950                         $items[] = self::blockLink( $userId, $userText );
 951                 }
 952
 953                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
 954                         $items[] = self::emailLink( $userId, $userText );
 955                 }
 956
 957                 Hooks::run( 'UserToolLinksEdit', [ $userId, $userText, &$items ] );
 958
 959                 if ( $items ) {
 960                         return wfMessage( 'word-separator' )->escaped()
 961                                 . '<span class="mw-usertoollinks">'
 962                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
 963                                 . '</span>';
 964                 } else {
 965                         return '';
 966                 }
 967         }
 968
 969         /**
 970          * Alias for userToolLinks( $userId, $userText, true );
 971          * @since 1.16.3
 972          * @param int $userId User identifier
 973          * @param string $userText User name or IP address
 974          * @param int|null $edits User edit count (optional, for performance)
 975          * @return string
 976          */
 977         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
 978                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
 979         }
 980
 981         /**
 982          * @since 1.16.3
 983          * @param int $userId User id in database.
 984          * @param string $userText User name in database.
 985          * @return string HTML fragment with user talk link
 986          */
 987         public static function userTalkLink( $userId, $userText ) {
 988                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
 989                 $moreLinkAttribs['class'] = 'mw-usertoollinks-talk';
 990                 $userTalkLink = self::link( $userTalkPage,
 991                                                 wfMessage( 'talkpagelinktext' )->escaped(),
 992                                                 $moreLinkAttribs );
 993                 return $userTalkLink;
 994         }
 995
 996         /**
 997          * @since 1.16.3
 998          * @param int $userId
 999          * @param string $userText User name in database.
1000          * @return string HTML fragment with block link
1001          */
1002         public static function blockLink( $userId, $userText ) {
1003                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1004                 $moreLinkAttribs['class'] = 'mw-usertoollinks-block';
1005                 $blockLink = self::link( $blockPage,
1006                                          wfMessage( 'blocklink' )->escaped(),
1007                                          $moreLinkAttribs );
1008                 return $blockLink;
1009         }
1010
1011         /**
1012          * @param int $userId
1013          * @param string $userText User name in database.
1014          * @return string HTML fragment with e-mail user link
1015          */
1016         public static function emailLink( $userId, $userText ) {
1017                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1018                 $moreLinkAttribs['class'] = 'mw-usertoollinks-mail';
1019                 $emailLink = self::link( $emailPage,
1020                                          wfMessage( 'emaillink' )->escaped(),
1021                                          $moreLinkAttribs );
1022                 return $emailLink;
1023         }
1024
1025         /**
1026          * Generate a user link if the current user is allowed to view it
1027          * @since 1.16.3
1028          * @param Revision $rev
1029          * @param bool $isPublic Show only if all users can see it
1030          * @return string HTML fragment
1031          */
1032         public static function revUserLink( $rev, $isPublic = false ) {
1033                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1034                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1035                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1036                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1037                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1038                 } else {
1039                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1040                 }
1041                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1042                         return '<span class="history-deleted">' . $link . '</span>';
1043                 }
1044                 return $link;
1045         }
1046
1047         /**
1048          * Generate a user tool link cluster if the current user is allowed to view it
1049          * @since 1.16.3
1050          * @param Revision $rev
1051          * @param bool $isPublic Show only if all users can see it
1052          * @return string HTML
1053          */
1054         public static function revUserTools( $rev, $isPublic = false ) {
1055                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1056                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1057                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1058                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1059                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1060                         $link = self::userLink( $userId, $userText )
1061                                 . self::userToolLinks( $userId, $userText );
1062                 } else {
1063                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1064                 }
1065                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1066                         return ' <span class="history-deleted">' . $link . '</span>';
1067                 }
1068                 return $link;
1069         }
1070
1071         /**
1072          * This function is called by all recent changes variants, by the page history,
1073          * and by the user contributions list. It is responsible for formatting edit
1074          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1075          * auto-generated comments (from section editing) and formats [[wikilinks]].
1076          *
1077          * @author Erik Moeller <moeller@scireview.de>
1078          * @since 1.16.3. $wikiId added in 1.26
1079          *
1080          * @param string $comment
1081          * @param Title|null $title Title object (to generate link to the section in autocomment)
1082          *  or null
1083          * @param bool $local Whether section links should refer to local page
1084          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1085          *  For use with external changes.
1086          *
1087          * @return string HTML
1088          */
1089         public static function formatComment(
1090                 $comment, $title = null, $local = false, $wikiId = null
1091         ) {
1092                 # Sanitize text a bit:
1093                 $comment = str_replace( "\n", " ", $comment );
1094                 # Allow HTML entities (for T15815)
1095                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1096
1097                 # Render autocomments and make links:
1098                 $comment = self::formatAutocomments( $comment, $title, $local, $wikiId );
1099                 $comment = self::formatLinksInComment( $comment, $title, $local, $wikiId );
1100
1101                 return $comment;
1102         }
1103
1104         /**
1105          * Converts autogenerated comments in edit summaries into section links.
1106          *
1107          * The pattern for autogen comments is / * foo * /, which makes for
1108          * some nasty regex.
1109          * We look for all comments, match any text before and after the comment,
1110          * add a separator where needed and format the comment itself with CSS
1111          * Called by Linker::formatComment.
1112          *
1113          * @param string $comment Comment text
1114          * @param Title|null $title An optional title object used to links to sections
1115          * @param bool $local Whether section links should refer to local page
1116          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1117          *  as used by WikiMap.
1118          *
1119          * @return string Formatted comment (wikitext)
1120          */
1121         private static function formatAutocomments(
1122                 $comment, $title = null, $local = false, $wikiId = null
1123         ) {
1124                 // @todo $append here is something of a hack to preserve the status
1125                 // quo. Someone who knows more about bidi and such should decide
1126                 // (1) what sane rendering even *is* for an LTR edit summary on an RTL
1127                 // wiki, both when autocomments exist and when they don't, and
1128                 // (2) what markup will make that actually happen.
1129                 $append = '';
1130                 $comment = preg_replace_callback(
1131                         // To detect the presence of content before or after the
1132                         // auto-comment, we use capturing groups inside optional zero-width
1133                         // assertions. But older versions of PCRE can't directly make
1134                         // zero-width assertions optional, so wrap them in a non-capturing
1135                         // group.
1136                         '!(?:(?<=(.)))?/\*\s*(.*?)\s*\*/(?:(?=(.)))?!',
1137                         function ( $match ) use ( $title, $local, $wikiId, &$append ) {
1138                                 global $wgLang;
1139
1140                                 // Ensure all match positions are defined
1141                                 $match += [ '', '', '', '' ];
1142
1143                                 $pre = $match[1] !== '';
1144                                 $auto = $match[2];
1145                                 $post = $match[3] !== '';
1146                                 $comment = null;
1147
1148                                 Hooks::run(
1149                                         'FormatAutocomments',
1150                                         [ &$comment, $pre, $auto, $post, $title, $local, $wikiId ]
1151                                 );
1152
1153                                 if ( $comment === null ) {
1154                                         $link = '';
1155                                         if ( $title ) {
1156                                                 $section = $auto;
1157                                                 # Remove links that a user may have manually put in the autosummary
1158                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1159                                                 $section = str_replace( '[[:', '', $section );
1160                                                 $section = str_replace( '[[', '', $section );
1161                                                 $section = str_replace( ']]', '', $section );
1162
1163                                                 $section = substr( Parser::guessSectionNameFromStrippedText( $section ), 1 );
1164                                                 if ( $local ) {
1165                                                         $sectionTitle = Title::makeTitleSafe( NS_MAIN, '', $section );
1166                                                 } else {
1167                                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1168                                                                 $title->getDBkey(), $section );
1169                                                 }
1170                                                 if ( $sectionTitle ) {
1171                                                         $link = Linker::makeCommentLink(
1172                                                                 $sectionTitle, $wgLang->getArrow() . $auto, $wikiId, 'noclasses'
1173                                                         );
1174                                                         $auto = '';
1175                                                 } else {
1176                                                         $link = '';
1177                                                 }
1178                                         }
1179                                         if ( $pre ) {
1180                                                 # written summary $presep autocomment (summary /* section */)
1181                                                 $pre = wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1182                                         }
1183                                         if ( $post ) {
1184                                                 # autocomment $postsep written summary (/* section */ summary)
1185                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1186                                         }
1187                                         if ( $auto ) {
1188                                                 $auto = '<span dir="auto"><span class="autocomment">' . $auto . '</span>';
1189                                                 $append .= '</span>';
1190                                         }
1191                                         $comment = $pre . $link . $wgLang->getDirMark() . $auto;
1192                                 }
1193                                 return $comment;
1194                         },
1195                         $comment
1196                 );
1197                 return $comment . $append;
1198         }
1199
1200         /**
1201          * Formats wiki links and media links in text; all other wiki formatting
1202          * is ignored
1203          *
1204          * @since 1.16.3. $wikiId added in 1.26
1205          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1206          *
1207          * @param string $comment Text to format links in. WARNING! Since the output of this
1208          *      function is html, $comment must be sanitized for use as html. You probably want
1209          *      to pass $comment through Sanitizer::escapeHtmlAllowEntities() before calling
1210          *      this function.
1211          * @param Title|null $title An optional title object used to links to sections
1212          * @param bool $local Whether section links should refer to local page
1213          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1214          *  as used by WikiMap.
1215          *
1216          * @return string HTML
1217          * @return-taint onlysafefor_html
1218          */
1219         public static function formatLinksInComment(
1220                 $comment, $title = null, $local = false, $wikiId = null
1221         ) {
1222                 return preg_replace_callback(
1223                         '/
1224                                 \[\[
1225                                 \s*+ # ignore leading whitespace, the *+ quantifier disallows backtracking
1226                                 :? # ignore optional leading colon
1227                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1228                                 (?:\|
1229                                         # 2. link text
1230                                         # Stop matching at ]] without relying on backtracking.
1231                                         ((?:]?[^\]])*+)
1232                                 )?
1233                                 \]\]
1234                                 ([^[]*) # 3. link trail (the text up until the next link)
1235                         /x',
1236                         function ( $match ) use ( $title, $local, $wikiId ) {
1237                                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1238                                 $medians .= preg_quote(
1239                                         MediaWikiServices::getInstance()->getContentLanguage()->getNsText( NS_MEDIA ),
1240                                         '/'
1241                                 ) . '):';
1242
1243                                 $comment = $match[0];
1244
1245                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1246                                 if ( strpos( $match[1], '%' ) !== false ) {
1247                                         $match[1] = strtr(
1248                                                 rawurldecode( $match[1] ),
1249                                                 [ '<' => '&lt;', '>' => '&gt;' ]
1250                                         );
1251                                 }
1252
1253                                 # Handle link renaming [[foo|text]] will show link as "text"
1254                                 if ( $match[2] != "" ) {
1255                                         $text = $match[2];
1256                                 } else {
1257                                         $text = $match[1];
1258                                 }
1259                                 $submatch = [];
1260                                 $thelink = null;
1261                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1262                                         # Media link; trail not supported.
1263                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1264                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1265                                         if ( $title ) {
1266                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1267                                         }
1268                                 } else {
1269                                         # Other kind of link
1270                                         # Make sure its target is non-empty
1271                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1272                                                 $match[1] = substr( $match[1], 1 );
1273                                         }
1274                                         if ( $match[1] !== false && $match[1] !== '' ) {
1275                                                 if ( preg_match(
1276                                                         MediaWikiServices::getInstance()->getContentLanguage()->linkTrail(),
1277                                                         $match[3],
1278                                                         $submatch
1279                                                 ) ) {
1280                                                         $trail = $submatch[1];
1281                                                 } else {
1282                                                         $trail = "";
1283                                                 }
1284                                                 $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1285                                                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1286
1287                                                 $linkText = $text;
1288                                                 $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1289
1290                                                 $target = Title::newFromText( $linkTarget );
1291                                                 if ( $target ) {
1292                                                         if ( $target->getText() == '' && !$target->isExternal()
1293                                                                 && !$local && $title
1294                                                         ) {
1295                                                                 $target = $title->createFragmentTarget( $target->getFragment() );
1296                                                         }
1297
1298                                                         $thelink = Linker::makeCommentLink( $target, $linkText . $inside, $wikiId ) . $trail;
1299                                                 }
1300                                         }
1301                                 }
1302                                 if ( $thelink ) {
1303                                         // If the link is still valid, go ahead and replace it in!
1304                                         $comment = preg_replace(
1305                                                 $linkRegexp,
1306                                                 StringUtils::escapeRegexReplacement( $thelink ),
1307                                                 $comment,
1308                                                 1
1309                                         );
1310                                 }
1311
1312                                 return $comment;
1313                         },
1314                         $comment
1315                 );
1316         }
1317
1318         /**
1319          * Generates a link to the given Title
1320          *
1321          * @note This is only public for technical reasons. It's not intended for use outside Linker.
1322          *
1323          * @param LinkTarget $linkTarget
1324          * @param string $text
1325          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1326          *  as used by WikiMap.
1327          * @param string|string[] $options See the $options parameter in Linker::link.
1328          *
1329          * @return string HTML link
1330          */
1331         public static function makeCommentLink(
1332                 LinkTarget $linkTarget, $text, $wikiId = null, $options = []
1333         ) {
1334                 if ( $wikiId !== null && !$linkTarget->isExternal() ) {
1335                         $link = self::makeExternalLink(
1336                                 WikiMap::getForeignURL(
1337                                         $wikiId,
1338                                         $linkTarget->getNamespace() === 0
1339                                                 ? $linkTarget->getDBkey()
1340                                                 : MWNamespace::getCanonicalName( $linkTarget->getNamespace() ) . ':'
1341                                                         . $linkTarget->getDBkey(),
1342                                         $linkTarget->getFragment()
1343                                 ),
1344                                 $text,
1345                                 /* escape = */ false // Already escaped
1346                         );
1347                 } else {
1348                         $link = self::link( $linkTarget, $text, [], [], $options );
1349                 }
1350
1351                 return $link;
1352         }
1353
1354         /**
1355          * @param Title $contextTitle
1356          * @param string $target
1357          * @param string &$text
1358          * @return string
1359          */
1360         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1361                 # Valid link forms:
1362                 # Foobar -- normal
1363                 # :Foobar -- override special treatment of prefix (images, language links)
1364                 # /Foobar -- convert to CurrentPage/Foobar
1365                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial and final / from text
1366                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1367                 # ../Foobar -- convert to CurrentPage/Foobar,
1368                 #              (from CurrentPage/CurrentSubPage)
1369                 # ../Foobar/ -- convert to CurrentPage/Foobar, use 'Foobar' as text
1370                 #              (from CurrentPage/CurrentSubPage)
1371
1372                 $ret = $target; # default return value is no change
1373
1374                 # Some namespaces don't allow subpages,
1375                 # so only perform processing if subpages are allowed
1376                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1377                         $hash = strpos( $target, '#' );
1378                         if ( $hash !== false ) {
1379                                 $suffix = substr( $target, $hash );
1380                                 $target = substr( $target, 0, $hash );
1381                         } else {
1382                                 $suffix = '';
1383                         }
1384                         # T9425
1385                         $target = trim( $target );
1386                         # Look at the first character
1387                         if ( $target != '' && $target[0] === '/' ) {
1388                                 # / at end means we don't want the slash to be shown
1389                                 $m = [];
1390                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1391                                 if ( $trailingSlashes ) {
1392                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1393                                 } else {
1394                                         $noslash = substr( $target, 1 );
1395                                 }
1396
1397                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1398                                 if ( $text === '' ) {
1399                                         $text = $target . $suffix;
1400                                 } # this might be changed for ugliness reasons
1401                         } else {
1402                                 # check for .. subpage backlinks
1403                                 $dotdotcount = 0;
1404                                 $nodotdot = $target;
1405                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1406                                         ++$dotdotcount;
1407                                         $nodotdot = substr( $nodotdot, 3 );
1408                                 }
1409                                 if ( $dotdotcount > 0 ) {
1410                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1411                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1412                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1413                                                 # / at the end means don't show full path
1414                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1415                                                         $nodotdot = rtrim( $nodotdot, '/' );
1416                                                         if ( $text === '' ) {
1417                                                                 $text = $nodotdot . $suffix;
1418                                                         }
1419                                                 }
1420                                                 $nodotdot = trim( $nodotdot );
1421                                                 if ( $nodotdot != '' ) {
1422                                                         $ret .= '/' . $nodotdot;
1423                                                 }
1424                                                 $ret .= $suffix;
1425                                         }
1426                                 }
1427                         }
1428                 }
1429
1430                 return $ret;
1431         }
1432
1433         /**
1434          * Wrap a comment in standard punctuation and formatting if
1435          * it's non-empty, otherwise return empty string.
1436          *
1437          * @since 1.16.3. $wikiId added in 1.26
1438          * @param string $comment
1439          * @param Title|null $title Title object (to generate link to section in autocomment) or null
1440          * @param bool $local Whether section links should refer to local page
1441          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1442          *  For use with external changes.
1443          *
1444          * @return string
1445          */
1446         public static function commentBlock(
1447                 $comment, $title = null, $local = false, $wikiId = null, $useParentheses = true
1448         ) {
1449                 // '*' used to be the comment inserted by the software way back
1450                 // in antiquity in case none was provided, here for backwards
1451                 // compatibility, acc. to brion -ævar
1452                 if ( $comment == '' || $comment == '*' ) {
1453                         return '';
1454                 } else {
1455                         $formatted = self::formatComment( $comment, $title, $local, $wikiId );
1456                         if ( $useParentheses ) {
1457                                 $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1458                                 $classNames = 'comment';
1459                         } else {
1460                                 $classNames = 'comment comment--without-parentheses';
1461                         }
1462                         return " <span class=\"$classNames\">$formatted</span>";
1463                 }
1464         }
1465
1466         /**
1467          * Wrap and format the given revision's comment block, if the current
1468          * user is allowed to view it.
1469          *
1470          * @since 1.16.3
1471          * @param Revision $rev
1472          * @param bool $local Whether section links should refer to local page
1473          * @param bool $isPublic Show only if all users can see it
1474          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
1475          * @return string HTML fragment
1476          */
1477         public static function revComment( Revision $rev, $local = false, $isPublic = false,
1478                 $useParentheses = true
1479         ) {
1480                 if ( $rev->getComment( Revision::RAW ) == "" ) {
1481                         return "";
1482                 }
1483                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1484                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1485                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1486                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1487                                 $rev->getTitle(), $local, null, $useParentheses );
1488                 } else {
1489                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1490                 }
1491                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1492                         return " <span class=\"history-deleted\">$block</span>";
1493                 }
1494                 return $block;
1495         }
1496
1497         /**
1498          * @since 1.16.3
1499          * @param int $size
1500          * @return string
1501          */
1502         public static function formatRevisionSize( $size ) {
1503                 if ( $size == 0 ) {
1504                         $stxt = wfMessage( 'historyempty' )->escaped();
1505                 } else {
1506                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1507                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1508                 }
1509                 return "<span class=\"history-size\">$stxt</span>";
1510         }
1511
1512         /**
1513          * Add another level to the Table of Contents
1514          *
1515          * @since 1.16.3
1516          * @return string
1517          */
1518         public static function tocIndent() {
1519                 return "\n<ul>\n";
1520         }
1521
1522         /**
1523          * Finish one or more sublevels on the Table of Contents
1524          *
1525          * @since 1.16.3
1526          * @param int $level
1527          * @return string
1528          */
1529         public static function tocUnindent( $level ) {
1530                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1531         }
1532
1533         /**
1534          * parameter level defines if we are on an indentation level
1535          *
1536          * @since 1.16.3
1537          * @param string $anchor
1538          * @param string $tocline
1539          * @param string $tocnumber
1540          * @param string $level
1541          * @param string|bool $sectionIndex
1542          * @return string
1543          */
1544         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1545                 $classes = "toclevel-$level";
1546                 if ( $sectionIndex !== false ) {
1547                         $classes .= " tocsection-$sectionIndex";
1548                 }
1549
1550                 // <li class="$classes"><a href="#$anchor"><span class="tocnumber">
1551                 // $tocnumber</span> <span class="toctext">$tocline</span></a>
1552                 return Html::openElement( 'li', [ 'class' => $classes ] )
1553                         . Html::rawElement( 'a',
1554                                 [ 'href' => "#$anchor" ],
1555                                 Html::element( 'span', [ 'class' => 'tocnumber' ], $tocnumber )
1556                                         . ' '
1557                                         . Html::rawElement( 'span', [ 'class' => 'toctext' ], $tocline )
1558                         );
1559         }
1560
1561         /**
1562          * End a Table Of Contents line.
1563          * tocUnindent() will be used instead if we're ending a line below
1564          * the new level.
1565          * @since 1.16.3
1566          * @return string
1567          */
1568         public static function tocLineEnd() {
1569                 return "</li>\n";
1570         }
1571
1572         /**
1573          * Wraps the TOC in a table and provides the hide/collapse javascript.
1574          *
1575          * @since 1.16.3
1576          * @param string $toc Html of the Table Of Contents
1577          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1578          * @return string Full html of the TOC
1579          */
1580         public static function tocList( $toc, $lang = false ) {
1581                 $lang = wfGetLangObj( $lang );
1582                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1583
1584                 return '<div id="toc" class="toc">'
1585                         . Html::element( 'input', [
1586                                 'type' => 'checkbox',
1587                                 'role' => 'button',
1588                                 'id' => 'toctogglecheckbox',
1589                                 'class' => 'toctogglecheckbox',
1590                                 'style' => 'display:none',
1591                         ] )
1592                         . Html::openElement( 'div', [
1593                                 'class' => 'toctitle',
1594                                 'lang' => $lang->getHtmlCode(),
1595                                 'dir' => $lang->getDir(),
1596                         ] )
1597                         . "<h2>$title</h2>"
1598                         . '<span class="toctogglespan">'
1599                         . Html::label( '', 'toctogglecheckbox', [
1600                                 'class' => 'toctogglelabel',
1601                         ] )
1602                         . '</span>'
1603                         . "</div>\n"
1604                         . $toc
1605                         . "</ul>\n</div>\n";
1606         }
1607
1608         /**
1609          * Generate a table of contents from a section tree.
1610          *
1611          * @since 1.16.3. $lang added in 1.17
1612          * @param array $tree Return value of ParserOutput::getSections()
1613          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1614          * @return string HTML fragment
1615          */
1616         public static function generateTOC( $tree, $lang = false ) {
1617                 $toc = '';
1618                 $lastLevel = 0;
1619                 foreach ( $tree as $section ) {
1620                         if ( $section['toclevel'] > $lastLevel ) {
1621                                 $toc .= self::tocIndent();
1622                         } elseif ( $section['toclevel'] < $lastLevel ) {
1623                                 $toc .= self::tocUnindent(
1624                                         $lastLevel - $section['toclevel'] );
1625                         } else {
1626                                 $toc .= self::tocLineEnd();
1627                         }
1628
1629                         $toc .= self::tocLine( $section['anchor'],
1630                                 $section['line'], $section['number'],
1631                                 $section['toclevel'], $section['index'] );
1632                         $lastLevel = $section['toclevel'];
1633                 }
1634                 $toc .= self::tocLineEnd();
1635                 return self::tocList( $toc, $lang );
1636         }
1637
1638         /**
1639          * Create a headline for content
1640          *
1641          * @since 1.16.3
1642          * @param int $level The level of the headline (1-6)
1643          * @param string $attribs Any attributes for the headline, starting with
1644          *   a space and ending with '>'
1645          *   This *must* be at least '>' for no attribs
1646          * @param string $anchor The anchor to give the headline (the bit after the #)
1647          * @param string $html HTML for the text of the header
1648          * @param string $link HTML to add for the section edit link
1649          * @param string|bool $fallbackAnchor A second, optional anchor to give for
1650          *   backward compatibility (false to omit)
1651          *
1652          * @return string HTML headline
1653          */
1654         public static function makeHeadline( $level, $attribs, $anchor, $html,
1655                 $link, $fallbackAnchor = false
1656         ) {
1657                 $anchorEscaped = htmlspecialchars( $anchor );
1658                 $fallback = '';
1659                 if ( $fallbackAnchor !== false && $fallbackAnchor !== $anchor ) {
1660                         $fallbackAnchor = htmlspecialchars( $fallbackAnchor );
1661                         $fallback = "<span id=\"$fallbackAnchor\"></span>";
1662                 }
1663                 $ret = "<h$level$attribs"
1664                         . "$fallback<span class=\"mw-headline\" id=\"$anchorEscaped\">$html</span>"
1665                         . $link
1666                         . "</h$level>";
1667
1668                 return $ret;
1669         }
1670
1671         /**
1672          * Split a link trail, return the "inside" portion and the remainder of the trail
1673          * as a two-element array
1674          * @param string $trail
1675          * @return array
1676          */
1677         static function splitTrail( $trail ) {
1678                 $regex = MediaWikiServices::getInstance()->getContentLanguage()->linkTrail();
1679                 $inside = '';
1680                 if ( $trail !== '' ) {
1681                         $m = [];
1682                         if ( preg_match( $regex, $trail, $m ) ) {
1683                                 $inside = $m[1];
1684                                 $trail = $m[2];
1685                         }
1686                 }
1687                 return [ $inside, $trail ];
1688         }
1689
1690         /**
1691          * Generate a rollback link for a given revision.  Currently it's the
1692          * caller's responsibility to ensure that the revision is the top one. If
1693          * it's not, of course, the user will get an error message.
1694          *
1695          * If the calling page is called with the parameter &bot=1, all rollback
1696          * links also get that parameter. It causes the edit itself and the rollback
1697          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1698          * changes, so this allows sysops to combat a busy vandal without bothering
1699          * other users.
1700          *
1701          * If the option verify is set this function will return the link only in case the
1702          * revision can be reverted. Please note that due to performance limitations
1703          * it might be assumed that a user isn't the only contributor of a page while
1704          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1705          * work if $wgShowRollbackEditCount is disabled, so this can only function
1706          * as an additional check.
1707          *
1708          * If the option noBrackets is set the rollback link wont be enclosed in "[]".
1709          *
1710          * @since 1.16.3. $context added in 1.20. $options added in 1.21
1711          *
1712          * @param Revision $rev
1713          * @param IContextSource|null $context Context to use or null for the main context.
1714          * @param array $options
1715          * @return string
1716          */
1717         public static function generateRollback( $rev, IContextSource $context = null,
1718                 $options = [ 'verify' ]
1719         ) {
1720                 if ( $context === null ) {
1721                         $context = RequestContext::getMain();
1722                 }
1723
1724                 $editCount = false;
1725                 if ( in_array( 'verify', $options, true ) ) {
1726                         $editCount = self::getRollbackEditCount( $rev, true );
1727                         if ( $editCount === false ) {
1728                                 return '';
1729                         }
1730                 }
1731
1732                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1733
1734                 if ( !in_array( 'noBrackets', $options, true ) ) {
1735                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->escaped();
1736                 }
1737
1738                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1739         }
1740
1741         /**
1742          * This function will return the number of revisions which a rollback
1743          * would revert and, if $verify is set it will verify that a revision
1744          * can be reverted (that the user isn't the only contributor and the
1745          * revision we might rollback to isn't deleted). These checks can only
1746          * function as an additional check as this function only checks against
1747          * the last $wgShowRollbackEditCount edits.
1748          *
1749          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1750          * is set and the user is the only contributor of the page.
1751          *
1752          * @param Revision $rev
1753          * @param bool $verify Try to verify that this revision can really be rolled back
1754          * @return int|bool|null
1755          */
1756         public static function getRollbackEditCount( $rev, $verify ) {
1757                 global $wgShowRollbackEditCount;
1758                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1759                         // Nothing has happened, indicate this by returning 'null'
1760                         return null;
1761                 }
1762
1763                 $dbr = wfGetDB( DB_REPLICA );
1764
1765                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1766                 $revQuery = Revision::getQueryInfo();
1767                 $res = $dbr->select(
1768                         $revQuery['tables'],
1769                         [ 'rev_user_text' => $revQuery['fields']['rev_user_text'], 'rev_deleted' ],
1770                         // $rev->getPage() returns null sometimes
1771                         [ 'rev_page' => $rev->getTitle()->getArticleID() ],
1772                         __METHOD__,
1773                         [
1774                                 'USE INDEX' => [ 'revision' => 'page_timestamp' ],
1775                                 'ORDER BY' => 'rev_timestamp DESC',
1776                                 'LIMIT' => $wgShowRollbackEditCount + 1
1777                         ],
1778                         $revQuery['joins']
1779                 );
1780
1781                 $editCount = 0;
1782                 $moreRevs = false;
1783                 foreach ( $res as $row ) {
1784                         if ( $rev->getUserText( Revision::RAW ) != $row->rev_user_text ) {
1785                                 if ( $verify &&
1786                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1787                                                 || $row->rev_deleted & Revision::DELETED_USER
1788                                 ) ) {
1789                                         // If the user or the text of the revision we might rollback
1790                                         // to is deleted in some way we can't rollback. Similar to
1791                                         // the sanity checks in WikiPage::commitRollback.
1792                                         return false;
1793                                 }
1794                                 $moreRevs = true;
1795                                 break;
1796                         }
1797                         $editCount++;
1798                 }
1799
1800                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1801                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1802                         // and there weren't any other revisions. That means that the current user is the only
1803                         // editor, so we can't rollback
1804                         return false;
1805                 }
1806                 return $editCount;
1807         }
1808
1809         /**
1810          * Build a raw rollback link, useful for collections of "tool" links
1811          *
1812          * @since 1.16.3. $context added in 1.20. $editCount added in 1.21
1813          * @param Revision $rev
1814          * @param IContextSource|null $context Context to use or null for the main context.
1815          * @param int $editCount Number of edits that would be reverted
1816          * @return string HTML fragment
1817          */
1818         public static function buildRollbackLink( $rev, IContextSource $context = null,
1819                 $editCount = false
1820         ) {
1821                 global $wgShowRollbackEditCount, $wgMiserMode;
1822
1823                 // To config which pages are affected by miser mode
1824                 $disableRollbackEditCountSpecialPage = [ 'Recentchanges', 'Watchlist' ];
1825
1826                 if ( $context === null ) {
1827                         $context = RequestContext::getMain();
1828                 }
1829
1830                 $title = $rev->getTitle();
1831                 $query = [
1832                         'action' => 'rollback',
1833                         'from' => $rev->getUserText(),
1834                         'token' => $context->getUser()->getEditToken( 'rollback' ),
1835                 ];
1836                 $attrs = [
1837                         'data-mw' => 'interface',
1838                         'title' => $context->msg( 'tooltip-rollback' )->text(),
1839                 ];
1840                 $options = [ 'known', 'noclasses' ];
1841
1842                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1843                         $query['bot'] = '1';
1844                         $query['hidediff'] = '1'; // T17999
1845                 }
1846
1847                 $disableRollbackEditCount = false;
1848                 if ( $wgMiserMode ) {
1849                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1850                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1851                                         $disableRollbackEditCount = true;
1852                                         break;
1853                                 }
1854                         }
1855                 }
1856
1857                 if ( !$disableRollbackEditCount
1858                         && is_int( $wgShowRollbackEditCount )
1859                         && $wgShowRollbackEditCount > 0
1860                 ) {
1861                         if ( !is_numeric( $editCount ) ) {
1862                                 $editCount = self::getRollbackEditCount( $rev, false );
1863                         }
1864
1865                         if ( $editCount > $wgShowRollbackEditCount ) {
1866                                 $html = $context->msg( 'rollbacklinkcount-morethan' )
1867                                         ->numParams( $wgShowRollbackEditCount )->parse();
1868                         } else {
1869                                 $html = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1870                         }
1871
1872                         return self::link( $title, $html, $attrs, $query, $options );
1873                 } else {
1874                         $html = $context->msg( 'rollbacklink' )->escaped();
1875                         return self::link( $title, $html, $attrs, $query, $options );
1876                 }
1877         }
1878
1879         /**
1880          * @deprecated since 1.28, use TemplatesOnThisPageFormatter directly
1881          *
1882          * Returns HTML for the "templates used on this page" list.
1883          *
1884          * Make an HTML list of templates, and then add a "More..." link at
1885          * the bottom. If $more is null, do not add a "More..." link. If $more
1886          * is a Title, make a link to that title and use it. If $more is a string,
1887          * directly paste it in as the link (escaping needs to be done manually).
1888          * Finally, if $more is a Message, call toString().
1889          *
1890          * @since 1.16.3. $more added in 1.21
1891          * @param Title[] $templates Array of templates
1892          * @param bool $preview Whether this is for a preview
1893          * @param bool $section Whether this is for a section edit
1894          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
1895          * @return string HTML output
1896          */
1897         public static function formatTemplates( $templates, $preview = false,
1898                 $section = false, $more = null
1899         ) {
1900                 wfDeprecated( __METHOD__, '1.28' );
1901
1902                 $type = false;
1903                 if ( $preview ) {
1904                         $type = 'preview';
1905                 } elseif ( $section ) {
1906                         $type = 'section';
1907                 }
1908
1909                 if ( $more instanceof Message ) {
1910                         $more = $more->toString();
1911                 }
1912
1913                 $formatter = new TemplatesOnThisPageFormatter(
1914                         RequestContext::getMain(),
1915                         MediaWikiServices::getInstance()->getLinkRenderer()
1916                 );
1917                 return $formatter->format( $templates, $type, $more );
1918         }
1919
1920         /**
1921          * Returns HTML for the "hidden categories on this page" list.
1922          *
1923          * @since 1.16.3
1924          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
1925          *   or similar
1926          * @return string HTML output
1927          */
1928         public static function formatHiddenCategories( $hiddencats ) {
1929                 $outText = '';
1930                 if ( count( $hiddencats ) > 0 ) {
1931                         # Construct the HTML
1932                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
1933                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
1934                         $outText .= "</div><ul>\n";
1935
1936                         foreach ( $hiddencats as $titleObj ) {
1937                                 # If it's hidden, it must exist - no need to check with a LinkBatch
1938                                 $outText .= '<li>'
1939                                         . self::link( $titleObj, null, [], [], 'known' )
1940                                         . "</li>\n";
1941                         }
1942                         $outText .= '</ul>';
1943                 }
1944                 return $outText;
1945         }
1946
1947         /**
1948          * @deprecated since 1.28, use Language::formatSize() directly
1949          *
1950          * Format a size in bytes for output, using an appropriate
1951          * unit (B, KB, MB or GB) according to the magnitude in question
1952          *
1953          * @since 1.16.3
1954          * @param int $size Size to format
1955          * @return string
1956          */
1957         public static function formatSize( $size ) {
1958                 wfDeprecated( __METHOD__, '1.28' );
1959
1960                 global $wgLang;
1961                 return htmlspecialchars( $wgLang->formatSize( $size ) );
1962         }
1963
1964         /**
1965          * Given the id of an interface element, constructs the appropriate title
1966          * attribute from the system messages.  (Note, this is usually the id but
1967          * isn't always, because sometimes the accesskey needs to go on a different
1968          * element than the id, for reverse-compatibility, etc.)
1969          *
1970          * @since 1.16.3 $msgParams added in 1.27
1971          * @param string $name Id of the element, minus prefixes.
1972          * @param string|array|null $options Null, string or array with some of the following options:
1973          *   - 'withaccess' to add an access-key hint
1974          *   - 'nonexisting' to add an accessibility hint that page does not exist
1975          * @param array $msgParams Parameters to pass to the message
1976          *
1977          * @return string Contents of the title attribute (which you must HTML-
1978          *   escape), or false for no title attribute
1979          */
1980         public static function titleAttrib( $name, $options = null, array $msgParams = [] ) {
1981                 $message = wfMessage( "tooltip-$name", $msgParams );
1982                 if ( !$message->exists() ) {
1983                         $tooltip = false;
1984                 } else {
1985                         $tooltip = $message->text();
1986                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
1987                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
1988                         # Message equal to '-' means suppress it.
1989                         if ( $tooltip == '-' ) {
1990                                 $tooltip = false;
1991                         }
1992                 }
1993
1994                 $options = (array)$options;
1995
1996                 if ( in_array( 'nonexisting', $options ) ) {
1997                         $tooltip = wfMessage( 'red-link-title', $tooltip ?: '' )->text();
1998                 }
1999                 if ( in_array( 'withaccess', $options ) ) {
2000                         $accesskey = self::accesskey( $name );
2001                         if ( $accesskey !== false ) {
2002                                 // Should be build the same as in jquery.accessKeyLabel.js
2003                                 if ( $tooltip === false || $tooltip === '' ) {
2004                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2005                                 } else {
2006                                         $tooltip .= wfMessage( 'word-separator' )->text();
2007                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2008                                 }
2009                         }
2010                 }
2011
2012                 return $tooltip;
2013         }
2014
2015         public static $accesskeycache;
2016
2017         /**
2018          * Given the id of an interface element, constructs the appropriate
2019          * accesskey attribute from the system messages.  (Note, this is usually
2020          * the id but isn't always, because sometimes the accesskey needs to go on
2021          * a different element than the id, for reverse-compatibility, etc.)
2022          *
2023          * @since 1.16.3
2024          * @param string $name Id of the element, minus prefixes.
2025          * @return string Contents of the accesskey attribute (which you must HTML-
2026          *   escape), or false for no accesskey attribute
2027          */
2028         public static function accesskey( $name ) {
2029                 if ( isset( self::$accesskeycache[$name] ) ) {
2030                         return self::$accesskeycache[$name];
2031                 }
2032
2033                 $message = wfMessage( "accesskey-$name" );
2034
2035                 if ( !$message->exists() ) {
2036                         $accesskey = false;
2037                 } else {
2038                         $accesskey = $message->plain();
2039                         if ( $accesskey === '' || $accesskey === '-' ) {
2040                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2041                                 # attribute, but this is broken for accesskey: that might be a useful
2042                                 # value.
2043                                 $accesskey = false;
2044                         }
2045                 }
2046
2047                 self::$accesskeycache[$name] = $accesskey;
2048                 return self::$accesskeycache[$name];
2049         }
2050
2051         /**
2052          * Get a revision-deletion link, or disabled link, or nothing, depending
2053          * on user permissions & the settings on the revision.
2054          *
2055          * Will use forward-compatible revision ID in the Special:RevDelete link
2056          * if possible, otherwise the timestamp-based ID which may break after
2057          * undeletion.
2058          *
2059          * @param User $user
2060          * @param Revision $rev
2061          * @param Title $title
2062          * @return string HTML fragment
2063          */
2064         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2065                 $canHide = $user->isAllowed( 'deleterevision' );
2066                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2067                         return '';
2068                 }
2069
2070                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2071                         return self::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2072                 } else {
2073                         if ( $rev->getId() ) {
2074                                 // RevDelete links using revision ID are stable across
2075                                 // page deletion and undeletion; use when possible.
2076                                 $query = [
2077                                         'type' => 'revision',
2078                                         'target' => $title->getPrefixedDBkey(),
2079                                         'ids' => $rev->getId()
2080                                 ];
2081                         } else {
2082                                 // Older deleted entries didn't save a revision ID.
2083                                 // We have to refer to these by timestamp, ick!
2084                                 $query = [
2085                                         'type' => 'archive',
2086                                         'target' => $title->getPrefixedDBkey(),
2087                                         'ids' => $rev->getTimestamp()
2088                                 ];
2089                         }
2090                         return self::revDeleteLink( $query,
2091                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2092                 }
2093         }
2094
2095         /**
2096          * Creates a (show/hide) link for deleting revisions/log entries
2097          *
2098          * @param array $query Query parameters to be passed to link()
2099          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2100          * @param bool $delete Set to true to use (show/hide) rather than (show)
2101          *
2102          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2103          * span to allow for customization of appearance with CSS
2104          */
2105         public static function revDeleteLink( $query = [], $restricted = false, $delete = true ) {
2106                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2107                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2108                 $html = wfMessage( $msgKey )->escaped();
2109                 $tag = $restricted ? 'strong' : 'span';
2110                 $link = self::link( $sp, $html, [], $query, [ 'known', 'noclasses' ] );
2111                 return Xml::tags(
2112                         $tag,
2113                         [ 'class' => 'mw-revdelundel-link' ],
2114                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2115                 );
2116         }
2117
2118         /**
2119          * Creates a dead (show/hide) link for deleting revisions/log entries
2120          *
2121          * @since 1.16.3
2122          * @param bool $delete Set to true to use (show/hide) rather than (show)
2123          *
2124          * @return string HTML text wrapped in a span to allow for customization
2125          * of appearance with CSS
2126          */
2127         public static function revDeleteLinkDisabled( $delete = true ) {
2128                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2129                 $html = wfMessage( $msgKey )->escaped();
2130                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2131                 return Xml::tags( 'span', [ 'class' => 'mw-revdelundel-link' ], $htmlParentheses );
2132         }
2133
2134         /**
2135          * Returns the attributes for the tooltip and access key.
2136          *
2137          * @since 1.16.3. $msgParams introduced in 1.27
2138          * @param string $name
2139          * @param array $msgParams Params for constructing the message
2140          * @param string|array|null $options Options to be passed to titleAttrib.
2141          *
2142          * @see Linker::titleAttrib for what options could be passed to $options.
2143          *
2144          * @return array
2145          */
2146         public static function tooltipAndAccesskeyAttribs(
2147                 $name,
2148                 array $msgParams = [],
2149                 $options = null
2150         ) {
2151                 $options = (array)$options;
2152                 $options[] = 'withaccess';
2153
2154                 $attribs = [
2155                         'title' => self::titleAttrib( $name, $options, $msgParams ),
2156                         'accesskey' => self::accesskey( $name )
2157                 ];
2158                 if ( $attribs['title'] === false ) {
2159                         unset( $attribs['title'] );
2160                 }
2161                 if ( $attribs['accesskey'] === false ) {
2162                         unset( $attribs['accesskey'] );
2163                 }
2164                 return $attribs;
2165         }
2166
2167         /**
2168          * Returns raw bits of HTML, use titleAttrib()
2169          * @since 1.16.3
2170          * @param string $name
2171          * @param array|null $options
2172          * @return null|string
2173          */
2174         public static function tooltip( $name, $options = null ) {
2175                 $tooltip = self::titleAttrib( $name, $options );
2176                 if ( $tooltip === false ) {
2177                         return '';
2178                 }
2179                 return Xml::expandAttributes( [
2180                         'title' => $tooltip
2181                 ] );
2182         }
2183
2184 }