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 LinkTarget, 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 LinkTarget (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 LinkTarget; or if the LinkTarget 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                 $services = MediaWikiServices::getInstance();
  93                 $options = (array)$options;
  94                 if ( $options ) {
  95                         // Custom options, create new LinkRenderer
  96                         if ( !isset( $options['stubThreshold'] ) ) {
  97                                 $defaultLinkRenderer = $services->getLinkRenderer();
  98                                 $options['stubThreshold'] = $defaultLinkRenderer->getStubThreshold();
  99                         }
 100                         $linkRenderer = $services->getLinkRendererFactory()
 101                                 ->createFromLegacyOptions( $options );
 102                 } else {
 103                         $linkRenderer = $services->getLinkRenderer();
 104                 }
 105
 106                 if ( $html !== null ) {
 107                         $text = new HtmlArmor( $html );
 108                 } else {
 109                         $text = null;
 110                 }
 111
 112                 if ( in_array( 'known', $options, true ) ) {
 113                         return $linkRenderer->makeKnownLink( $target, $text, $customAttribs, $query );
 114                 }
 115
 116                 if ( in_array( 'broken', $options, true ) ) {
 117                         return $linkRenderer->makeBrokenLink( $target, $text, $customAttribs, $query );
 118                 }
 119
 120                 if ( in_array( 'noclasses', $options, true ) ) {
 121                         return $linkRenderer->makePreloadedLink( $target, $text, '', $customAttribs, $query );
 122                 }
 123
 124                 return $linkRenderer->makeLink( $target, $text, $customAttribs, $query );
 125         }
 126
 127         /**
 128          * Identical to link(), except $options defaults to 'known'.
 129          *
 130          * @since 1.16.3
 131          * @deprecated since 1.28, use MediaWiki\Linker\LinkRenderer instead
 132          * @see Linker::link
 133          * @param LinkTarget $target
 134          * @param string $html
 135          * @param array $customAttribs
 136          * @param array $query
 137          * @param string|array $options
 138          * @return string
 139          */
 140         public static function linkKnown(
 141                 $target, $html = null, $customAttribs = [],
 142                 $query = [], $options = [ 'known' ]
 143         ) {
 144                 return self::link( $target, $html, $customAttribs, $query, $options );
 145         }
 146
 147         /**
 148          * Make appropriate markup for a link to the current article. This is since
 149          * MediaWiki 1.29.0 rendered as an <a> tag without an href and with a class
 150          * showing the link text. The calling sequence is the same as for the other
 151          * make*LinkObj static functions, but $query is not used.
 152          *
 153          * @since 1.16.3
 154          * @param LinkTarget $nt
 155          * @param string $html [optional]
 156          * @param string $query [optional]
 157          * @param string $trail [optional]
 158          * @param string $prefix [optional]
 159          *
 160          * @return string
 161          */
 162         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 163                 $nt = Title::newFromLinkTarget( $nt );
 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 ( MediaWikiServices::getInstance()->getNamespaceInfo()->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                 }
 197
 198                 return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 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 SpecialPage::getTitleValueFor( $name, $subpage, $target->getFragment() );
 212                         }
 213                 }
 214
 215                 return $target;
 216         }
 217
 218         /**
 219          * Returns the filename part of an url.
 220          * Used as alternative text for external images.
 221          *
 222          * @param string $url
 223          *
 224          * @return string
 225          */
 226         private static function fnamePart( $url ) {
 227                 $basename = strrchr( $url, '/' );
 228                 if ( $basename === false ) {
 229                         $basename = $url;
 230                 } else {
 231                         $basename = substr( $basename, 1 );
 232                 }
 233                 return $basename;
 234         }
 235
 236         /**
 237          * Return the code for images which were added via external links,
 238          * via Parser::maybeMakeExternalImage().
 239          *
 240          * @since 1.16.3
 241          * @param string $url
 242          * @param string $alt
 243          *
 244          * @return string
 245          */
 246         public static function makeExternalImage( $url, $alt = '' ) {
 247                 if ( $alt == '' ) {
 248                         $alt = self::fnamePart( $url );
 249                 }
 250                 $img = '';
 251                 $success = Hooks::run( 'LinkerMakeExternalImage', [ &$url, &$alt, &$img ] );
 252                 if ( !$success ) {
 253                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 254                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 255                         return $img;
 256                 }
 257                 return Html::element( 'img',
 258                         [
 259                                 'src' => $url,
 260                                 'alt' => $alt
 261                         ]
 262                 );
 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 LinkTarget $title LinkTarget 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      LinkTarget 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, LinkTarget $title,
 303                 $file, $frameParams = [], $handlerParams = [], $time = false,
 304                 $query = "", $widthOption = null
 305         ) {
 306                 $title = Title::newFromLinkTarget( $title );
 307                 $res = null;
 308                 $dummy = new DummyLinker;
 309                 if ( !Hooks::run( 'ImageBeforeProduceHTML', [ &$dummy, &$title,
 310                         &$file, &$frameParams, &$handlerParams, &$time, &$res,
 311                         $parser, &$query, &$widthOption
 312                 ] ) ) {
 313                         return $res;
 314                 }
 315
 316                 if ( $file && !$file->allowInlineDisplay() ) {
 317                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 318                         return self::link( $title );
 319                 }
 320
 321                 // Clean up parameters
 322                 $page = $handlerParams['page'] ?? false;
 323                 if ( !isset( $frameParams['align'] ) ) {
 324                         $frameParams['align'] = '';
 325                 }
 326                 if ( !isset( $frameParams['alt'] ) ) {
 327                         $frameParams['alt'] = '';
 328                 }
 329                 if ( !isset( $frameParams['title'] ) ) {
 330                         $frameParams['title'] = '';
 331                 }
 332                 if ( !isset( $frameParams['class'] ) ) {
 333                         $frameParams['class'] = '';
 334                 }
 335
 336                 $prefix = $postfix = '';
 337
 338                 if ( $frameParams['align'] == 'center' ) {
 339                         $prefix = '<div class="center">';
 340                         $postfix = '</div>';
 341                         $frameParams['align'] = 'none';
 342                 }
 343                 if ( $file && !isset( $handlerParams['width'] ) ) {
 344                         if ( isset( $handlerParams['height'] ) && $file->isVectorized() ) {
 345                                 // If its a vector image, and user only specifies height
 346                                 // we don't want it to be limited by its "normal" width.
 347                                 global $wgSVGMaxSize;
 348                                 $handlerParams['width'] = $wgSVGMaxSize;
 349                         } else {
 350                                 $handlerParams['width'] = $file->getWidth( $page );
 351                         }
 352
 353                         if ( isset( $frameParams['thumbnail'] )
 354                                 || isset( $frameParams['manualthumb'] )
 355                                 || isset( $frameParams['framed'] )
 356                                 || isset( $frameParams['frameless'] )
 357                                 || !$handlerParams['width']
 358                         ) {
 359                                 global $wgThumbLimits, $wgThumbUpright;
 360
 361                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 362                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 363                                 }
 364
 365                                 // Reduce width for upright images when parameter 'upright' is used
 366                                 if ( isset( $frameParams['upright'] ) && $frameParams['upright'] == 0 ) {
 367                                         $frameParams['upright'] = $wgThumbUpright;
 368                                 }
 369
 370                                 // For caching health: If width scaled down due to upright
 371                                 // parameter, round to full __0 pixel to avoid the creation of a
 372                                 // lot of odd thumbs.
 373                                 $prefWidth = isset( $frameParams['upright'] ) ?
 374                                         round( $wgThumbLimits[$widthOption] * $frameParams['upright'], -1 ) :
 375                                         $wgThumbLimits[$widthOption];
 376
 377                                 // Use width which is smaller: real image width or user preference width
 378                                 // Unless image is scalable vector.
 379                                 if ( !isset( $handlerParams['height'] ) && ( $handlerParams['width'] <= 0 ||
 380                                                 $prefWidth < $handlerParams['width'] || $file->isVectorized() ) ) {
 381                                         $handlerParams['width'] = $prefWidth;
 382                                 }
 383                         }
 384                 }
 385
 386                 if ( isset( $frameParams['thumbnail'] ) || isset( $frameParams['manualthumb'] )
 387                         || isset( $frameParams['framed'] )
 388                 ) {
 389                         # Create a thumbnail. Alignment depends on the writing direction of
 390                         # the page content language (right-aligned for LTR languages,
 391                         # left-aligned for RTL languages)
 392                         # If a thumbnail width has not been provided, it is set
 393                         # to the default user option as specified in Language*.php
 394                         if ( $frameParams['align'] == '' ) {
 395                                 $frameParams['align'] = $parser->getTargetLanguage()->alignEnd();
 396                         }
 397                         return $prefix .
 398                                 self::makeThumbLink2( $title, $file, $frameParams, $handlerParams, $time, $query ) .
 399                                 $postfix;
 400                 }
 401
 402                 if ( $file && isset( $frameParams['frameless'] ) ) {
 403                         $srcWidth = $file->getWidth( $page );
 404                         # For "frameless" option: do not present an image bigger than the
 405                         # source (for bitmap-style images). This is the same behavior as the
 406                         # "thumb" option does it already.
 407                         if ( $srcWidth && !$file->mustRender() && $handlerParams['width'] > $srcWidth ) {
 408                                 $handlerParams['width'] = $srcWidth;
 409                         }
 410                 }
 411
 412                 if ( $file && isset( $handlerParams['width'] ) ) {
 413                         # Create a resized image, without the additional thumbnail features
 414                         $thumb = $file->transform( $handlerParams );
 415                 } else {
 416                         $thumb = false;
 417                 }
 418
 419                 if ( !$thumb ) {
 420                         $s = self::makeBrokenImageLinkObj( $title, $frameParams['title'], '', '', '', $time == true );
 421                 } else {
 422                         self::processResponsiveImages( $file, $thumb, $handlerParams );
 423                         $params = [
 424                                 'alt' => $frameParams['alt'],
 425                                 'title' => $frameParams['title'],
 426                                 'valign' => $frameParams['valign'] ?? false,
 427                                 'img-class' => $frameParams['class'] ];
 428                         if ( isset( $frameParams['border'] ) ) {
 429                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 430                         }
 431                         $params = self::getImageLinkMTOParams( $frameParams, $query, $parser ) + $params;
 432
 433                         $s = $thumb->toHtml( $params );
 434                 }
 435                 if ( $frameParams['align'] != '' ) {
 436                         $s = Html::rawElement(
 437                                 'div',
 438                                 [ 'class' => 'float' . $frameParams['align'] ],
 439                                 $s
 440                         );
 441                 }
 442                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 443         }
 444
 445         /**
 446          * Get the link parameters for MediaTransformOutput::toHtml() from given
 447          * frame parameters supplied by the Parser.
 448          * @param array $frameParams The frame parameters
 449          * @param string $query An optional query string to add to description page links
 450          * @param Parser|null $parser
 451          * @return array
 452          */
 453         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 454                 $mtoParams = [];
 455                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 456                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 457                         if ( isset( $frameParams['link-target'] ) ) {
 458                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 459                         }
 460                         if ( $parser ) {
 461                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 462                                 foreach ( $extLinkAttrs as $name => $val ) {
 463                                         // Currently could include 'rel' and 'target'
 464                                         $mtoParams['parser-extlink-' . $name] = $val;
 465                                 }
 466                         }
 467                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 468                         $mtoParams['custom-title-link'] = Title::newFromLinkTarget(
 469                                 self::normaliseSpecialPage( $frameParams['link-title'] )
 470                         );
 471                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 472                         // No link
 473                 } else {
 474                         $mtoParams['desc-link'] = true;
 475                         $mtoParams['desc-query'] = $query;
 476                 }
 477                 return $mtoParams;
 478         }
 479
 480         /**
 481          * Make HTML for a thumbnail including image, border and caption
 482          * @param LinkTarget $title
 483          * @param File|bool $file File object or false if it doesn't exist
 484          * @param string $label
 485          * @param string $alt
 486          * @param string $align
 487          * @param array $params
 488          * @param bool $framed
 489          * @param string $manualthumb
 490          * @return string
 491          */
 492         public static function makeThumbLinkObj( LinkTarget $title, $file, $label = '', $alt = '',
 493                 $align = 'right', $params = [], $framed = false, $manualthumb = ""
 494         ) {
 495                 $frameParams = [
 496                         'alt' => $alt,
 497                         'caption' => $label,
 498                         'align' => $align
 499                 ];
 500                 if ( $framed ) {
 501                         $frameParams['framed'] = true;
 502                 }
 503                 if ( $manualthumb ) {
 504                         $frameParams['manualthumb'] = $manualthumb;
 505                 }
 506                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 507         }
 508
 509         /**
 510          * @param LinkTarget $title
 511          * @param File $file
 512          * @param array $frameParams
 513          * @param array $handlerParams
 514          * @param bool $time
 515          * @param string $query
 516          * @return string
 517          */
 518         public static function makeThumbLink2( LinkTarget $title, $file, $frameParams = [],
 519                 $handlerParams = [], $time = false, $query = ""
 520         ) {
 521                 $exists = $file && $file->exists();
 522
 523                 $page = $handlerParams['page'] ?? false;
 524                 if ( !isset( $frameParams['align'] ) ) {
 525                         $frameParams['align'] = 'right';
 526                 }
 527                 if ( !isset( $frameParams['alt'] ) ) {
 528                         $frameParams['alt'] = '';
 529                 }
 530                 if ( !isset( $frameParams['title'] ) ) {
 531                         $frameParams['title'] = '';
 532                 }
 533                 if ( !isset( $frameParams['caption'] ) ) {
 534                         $frameParams['caption'] = '';
 535                 }
 536
 537                 if ( empty( $handlerParams['width'] ) ) {
 538                         // Reduce width for upright images when parameter 'upright' is used
 539                         $handlerParams['width'] = isset( $frameParams['upright'] ) ? 130 : 180;
 540                 }
 541                 $thumb = false;
 542                 $noscale = false;
 543                 $manualthumb = false;
 544
 545                 if ( !$exists ) {
 546                         $outerWidth = $handlerParams['width'] + 2;
 547                 } else {
 548                         if ( isset( $frameParams['manualthumb'] ) ) {
 549                                 # Use manually specified thumbnail
 550                                 $manual_title = Title::makeTitleSafe( NS_FILE, $frameParams['manualthumb'] );
 551                                 if ( $manual_title ) {
 552                                         $manual_img = MediaWikiServices::getInstance()->getRepoGroup()
 553                                                 ->findFile( $manual_title );
 554                                         if ( $manual_img ) {
 555                                                 $thumb = $manual_img->getUnscaledThumb( $handlerParams );
 556                                                 $manualthumb = true;
 557                                         } else {
 558                                                 $exists = false;
 559                                         }
 560                                 }
 561                         } elseif ( isset( $frameParams['framed'] ) ) {
 562                                 // Use image dimensions, don't scale
 563                                 $thumb = $file->getUnscaledThumb( $handlerParams );
 564                                 $noscale = true;
 565                         } else {
 566                                 # Do not present an image bigger than the source, for bitmap-style images
 567                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 568                                 $srcWidth = $file->getWidth( $page );
 569                                 if ( $srcWidth && !$file->mustRender() && $handlerParams['width'] > $srcWidth ) {
 570                                         $handlerParams['width'] = $srcWidth;
 571                                 }
 572                                 $thumb = $file->transform( $handlerParams );
 573                         }
 574
 575                         if ( $thumb ) {
 576                                 $outerWidth = $thumb->getWidth() + 2;
 577                         } else {
 578                                 $outerWidth = $handlerParams['width'] + 2;
 579                         }
 580                 }
 581
 582                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 583                 # So we don't need to pass it here in $query. However, the URL for the
 584                 # zoom icon still needs it, so we make a unique query for it. See T16771
 585                 $url = Title::newFromLinkTarget( $title )->getLocalURL( $query );
 586                 if ( $page ) {
 587                         $url = wfAppendQuery( $url, [ 'page' => $page ] );
 588                 }
 589                 if ( $manualthumb
 590                         && !isset( $frameParams['link-title'] )
 591                         && !isset( $frameParams['link-url'] )
 592                         && !isset( $frameParams['no-link'] ) ) {
 593                         $frameParams['link-url'] = $url;
 594                 }
 595
 596                 $s = "<div class=\"thumb t{$frameParams['align']}\">"
 597                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 598
 599                 if ( !$exists ) {
 600                         $s .= self::makeBrokenImageLinkObj( $title, $frameParams['title'], '', '', '', $time == true );
 601                         $zoomIcon = '';
 602                 } elseif ( !$thumb ) {
 603                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 604                         $zoomIcon = '';
 605                 } else {
 606                         if ( !$noscale && !$manualthumb ) {
 607                                 self::processResponsiveImages( $file, $thumb, $handlerParams );
 608                         }
 609                         $params = [
 610                                 'alt' => $frameParams['alt'],
 611                                 'title' => $frameParams['title'],
 612                                 'img-class' => ( isset( $frameParams['class'] ) && $frameParams['class'] !== ''
 613                                         ? $frameParams['class'] . ' '
 614                                         : '' ) . 'thumbimage'
 615                         ];
 616                         $params = self::getImageLinkMTOParams( $frameParams, $query ) + $params;
 617                         $s .= $thumb->toHtml( $params );
 618                         if ( isset( $frameParams['framed'] ) ) {
 619                                 $zoomIcon = "";
 620                         } else {
 621                                 $zoomIcon = Html::rawElement( 'div', [ 'class' => 'magnify' ],
 622                                         Html::rawElement( 'a', [
 623                                                 'href' => $url,
 624                                                 'class' => 'internal',
 625                                                 'title' => wfMessage( 'thumbnail-more' )->text() ],
 626                                                 "" ) );
 627                         }
 628                 }
 629                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $frameParams['caption'] . "</div></div></div>";
 630                 return str_replace( "\n", ' ', $s );
 631         }
 632
 633         /**
 634          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 635          * applicable.
 636          *
 637          * @param File $file
 638          * @param MediaTransformOutput $thumb
 639          * @param array $hp Image parameters
 640          */
 641         public static function processResponsiveImages( $file, $thumb, $hp ) {
 642                 global $wgResponsiveImages;
 643                 if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
 644                         $hp15 = $hp;
 645                         $hp15['width'] = round( $hp['width'] * 1.5 );
 646                         $hp20 = $hp;
 647                         $hp20['width'] = $hp['width'] * 2;
 648                         if ( isset( $hp['height'] ) ) {
 649                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 650                                 $hp20['height'] = $hp['height'] * 2;
 651                         }
 652
 653                         $thumb15 = $file->transform( $hp15 );
 654                         $thumb20 = $file->transform( $hp20 );
 655                         if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
 656                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 657                         }
 658                         if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
 659                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 660                         }
 661                 }
 662         }
 663
 664         /**
 665          * Make a "broken" link to an image
 666          *
 667          * @since 1.16.3
 668          * @param LinkTarget $title
 669          * @param string $label Link label (plain text)
 670          * @param string $query Query string
 671          * @param string $unused1 Unused parameter kept for b/c
 672          * @param string $unused2 Unused parameter kept for b/c
 673          * @param bool $time A file of a certain timestamp was requested
 674          * @return string
 675          */
 676         public static function makeBrokenImageLinkObj( $title, $label = '',
 677                 $query = '', $unused1 = '', $unused2 = '', $time = false
 678         ) {
 679                 if ( !$title instanceof LinkTarget ) {
 680                         wfWarn( __METHOD__ . ': Requires $title to be a LinkTarget object.' );
 681                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 682                 }
 683
 684                 $title = Title::castFromLinkTarget( $title );
 685
 686                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 687                 if ( $label == '' ) {
 688                         $label = $title->getPrefixedText();
 689                 }
 690                 $encLabel = htmlspecialchars( $label );
 691                 $currentExists = $time
 692                         && MediaWikiServices::getInstance()->getRepoGroup()->findFile( $title ) !== false;
 693
 694                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 695                         && !$currentExists
 696                 ) {
 697                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 698
 699                         if ( $redir ) {
 700                                 // We already know it's a redirect, so mark it
 701                                 // accordingly
 702                                 return self::link(
 703                                         $title,
 704                                         $encLabel,
 705                                         [ 'class' => 'mw-redirect' ],
 706                                         wfCgiToArray( $query ),
 707                                         [ 'known', 'noclasses' ]
 708                                 );
 709                         }
 710
 711                         $href = self::getUploadUrl( $title, $query );
 712
 713                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 714                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 715                                 $encLabel . '</a>';
 716                 }
 717
 718                 return self::link( $title, $encLabel, [], wfCgiToArray( $query ), [ 'known', 'noclasses' ] );
 719         }
 720
 721         /**
 722          * Get the URL to upload a certain file
 723          *
 724          * @since 1.16.3
 725          * @param LinkTarget $destFile LinkTarget object of the file to upload
 726          * @param string $query Urlencoded query string to prepend
 727          * @return string Urlencoded URL
 728          */
 729         protected static function getUploadUrl( $destFile, $query = '' ) {
 730                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 731                 $q = 'wpDestFile=' . Title::castFromLinkTarget( $destFile )->getPartialURL();
 732                 if ( $query != '' ) {
 733                         $q .= '&' . $query;
 734                 }
 735
 736                 if ( $wgUploadMissingFileUrl ) {
 737                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 738                 }
 739
 740                 if ( $wgUploadNavigationUrl ) {
 741                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 742                 }
 743
 744                 $upload = SpecialPage::getTitleFor( 'Upload' );
 745
 746                 return $upload->getLocalURL( $q );
 747         }
 748
 749         /**
 750          * Create a direct link to a given uploaded file.
 751          *
 752          * @since 1.16.3
 753          * @param LinkTarget $title
 754          * @param string $html Pre-sanitized HTML
 755          * @param string|false $time MW timestamp of file creation time
 756          * @return string HTML
 757          */
 758         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 759                 $img = MediaWikiServices::getInstance()->getRepoGroup()->findFile(
 760                         $title, [ 'time' => $time ]
 761                 );
 762                 return self::makeMediaLinkFile( $title, $img, $html );
 763         }
 764
 765         /**
 766          * Create a direct link to a given uploaded file.
 767          * This will make a broken link if $file is false.
 768          *
 769          * @since 1.16.3
 770          * @param LinkTarget $title
 771          * @param File|bool $file File object or false
 772          * @param string $html Pre-sanitized HTML
 773          * @return string HTML
 774          *
 775          * @todo Handle invalid or missing images better.
 776          */
 777         public static function makeMediaLinkFile( LinkTarget $title, $file, $html = '' ) {
 778                 if ( $file && $file->exists() ) {
 779                         $url = $file->getUrl();
 780                         $class = 'internal';
 781                 } else {
 782                         $url = self::getUploadUrl( $title );
 783                         $class = 'new';
 784                 }
 785
 786                 $alt = $title->getText();
 787                 if ( $html == '' ) {
 788                         $html = $alt;
 789                 }
 790
 791                 $ret = '';
 792                 $attribs = [
 793                         'href' => $url,
 794                         'class' => $class,
 795                         'title' => $alt
 796                 ];
 797
 798                 if ( !Hooks::run( 'LinkerMakeMediaLinkFile',
 799                         [ Title::castFromLinkTarget( $title ), $file, &$html, &$attribs, &$ret ] ) ) {
 800                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
 801                                 . "with url {$url} and text {$html} to {$ret}\n", true );
 802                         return $ret;
 803                 }
 804
 805                 return Html::rawElement( 'a', $attribs, $html );
 806         }
 807
 808         /**
 809          * Make a link to a special page given its name and, optionally,
 810          * a message key from the link text.
 811          * Usage example: Linker::specialLink( 'Recentchanges' )
 812          *
 813          * @since 1.16.3
 814          * @param string $name
 815          * @param string $key
 816          * @return string
 817          */
 818         public static function specialLink( $name, $key = '' ) {
 819                 if ( $key == '' ) {
 820                         $key = strtolower( $name );
 821                 }
 822
 823                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->escaped() );
 824         }
 825
 826         /**
 827          * Make an external link
 828          *
 829          * @since 1.16.3. $title added in 1.21
 830          * @param string $url URL to link to
 831          * @param-taint $url escapes_html
 832          * @param string $text Text of link
 833          * @param-taint $text escapes_html
 834          * @param bool $escape Do we escape the link text?
 835          * @param-taint $escape none
 836          * @param string $linktype Type of external link. Gets added to the classes
 837          * @param-taint $linktype escapes_html
 838          * @param array $attribs Array of extra attributes to <a>
 839          * @param-taint $attribs escapes_html
 840          * @param LinkTarget|null $title LinkTarget object used for title specific link attributes
 841          * @param-taint $title none
 842          * @return string
 843          */
 844         public static function makeExternalLink( $url, $text, $escape = true,
 845                 $linktype = '', $attribs = [], $title = null
 846         ) {
 847                 global $wgTitle;
 848                 $class = "external";
 849                 if ( $linktype ) {
 850                         $class .= " $linktype";
 851                 }
 852                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
 853                         $class .= " {$attribs['class']}";
 854                 }
 855                 $attribs['class'] = $class;
 856
 857                 if ( $escape ) {
 858                         $text = htmlspecialchars( $text );
 859                 }
 860
 861                 if ( !$title ) {
 862                         $title = $wgTitle;
 863                 }
 864                 $newRel = Parser::getExternalLinkRel( $url, $title );
 865                 if ( !isset( $attribs['rel'] ) || $attribs['rel'] === '' ) {
 866                         $attribs['rel'] = $newRel;
 867                 } elseif ( $newRel !== '' ) {
 868                         // Merge the rel attributes.
 869                         $newRels = explode( ' ', $newRel );
 870                         $oldRels = explode( ' ', $attribs['rel'] );
 871                         $combined = array_unique( array_merge( $newRels, $oldRels ) );
 872                         $attribs['rel'] = implode( ' ', $combined );
 873                 }
 874                 $link = '';
 875                 $success = Hooks::run( 'LinkerMakeExternalLink',
 876                         [ &$url, &$text, &$link, &$attribs, $linktype ] );
 877                 if ( !$success ) {
 878                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
 879                                 . "with url {$url} and text {$text} to {$link}\n", true );
 880                         return $link;
 881                 }
 882                 $attribs['href'] = $url;
 883                 return Html::rawElement( 'a', $attribs, $text );
 884         }
 885
 886         /**
 887          * Make user link (or user contributions for unregistered users)
 888          * @param int $userId User id in database.
 889          * @param string $userName User name in database.
 890          * @param string $altUserName Text to display instead of the user name (optional)
 891          * @return string HTML fragment
 892          * @since 1.16.3. $altUserName was added in 1.19.
 893          */
 894         public static function userLink( $userId, $userName, $altUserName = false ) {
 895                 if ( $userName === '' || $userName === false || $userName === null ) {
 896                         wfDebug( __METHOD__ . ' received an empty username. Are there database errors ' .
 897                                 'that need to be fixed?' );
 898                         return wfMessage( 'empty-username' )->parse();
 899                 }
 900
 901                 $classes = 'mw-userlink';
 902                 $page = null;
 903                 if ( $userId == 0 ) {
 904                         $page = ExternalUserNames::getUserLinkTitle( $userName );
 905
 906                         if ( ExternalUserNames::isExternal( $userName ) ) {
 907                                 $classes .= ' mw-extuserlink';
 908                         } elseif ( $altUserName === false ) {
 909                                 $altUserName = IP::prettifyIP( $userName );
 910                         }
 911                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (T45179)
 912                 } else {
 913                         $page = new TitleValue( NS_USER, strtr( $userName, ' ', '_' ) );
 914                 }
 915
 916                 // Wrap the output with <bdi> tags for directionality isolation
 917                 $linkText =
 918                         '<bdi>' . htmlspecialchars( $altUserName !== false ? $altUserName : $userName ) . '</bdi>';
 919
 920                 return $page
 921                         ? self::link( $page, $linkText, [ 'class' => $classes ] )
 922                         : Html::rawElement( 'span', [ 'class' => $classes ], $linkText );
 923         }
 924
 925         /**
 926          * Generate standard user tool links (talk, contributions, block link, etc.)
 927          *
 928          * @since 1.16.3
 929          * @param int $userId User identifier
 930          * @param string $userText User name or IP address
 931          * @param bool $redContribsWhenNoEdits Should the contributions link be
 932          *   red if the user has no edits?
 933          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
 934          *   and Linker::TOOL_LINKS_EMAIL).
 935          * @param int|null $edits User edit count (optional, for performance)
 936          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
 937          * @return string HTML fragment
 938          */
 939         public static function userToolLinks(
 940                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null,
 941                 $useParentheses = true
 942         ) {
 943                 if ( $userText === '' ) {
 944                         wfDebug( __METHOD__ . ' received an empty username. Are there database errors ' .
 945                                 'that need to be fixed?' );
 946                         return ' ' . wfMessage( 'empty-username' )->parse();
 947                 }
 948
 949                 global $wgUser, $wgDisableAnonTalk, $wgLang;
 950                 $talkable = !( $wgDisableAnonTalk && $userId == 0 );
 951                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
 952                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
 953
 954                 if ( $userId == 0 && ExternalUserNames::isExternal( $userText ) ) {
 955                         // No tools for an external user
 956                         return '';
 957                 }
 958
 959                 $items = [];
 960                 if ( $talkable ) {
 961                         $items[] = self::userTalkLink( $userId, $userText );
 962                 }
 963                 if ( $userId ) {
 964                         // check if the user has an edit
 965                         $attribs = [];
 966                         $attribs['class'] = 'mw-usertoollinks-contribs';
 967                         if ( $redContribsWhenNoEdits ) {
 968                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
 969                                         $user = User::newFromId( $userId );
 970                                         $edits = $user->getEditCount();
 971                                 }
 972                                 if ( $edits === 0 ) {
 973                                         $attribs['class'] .= ' new';
 974                                 }
 975                         }
 976                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
 977
 978                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
 979                 }
 980                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
 981                         $items[] = self::blockLink( $userId, $userText );
 982                 }
 983
 984                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
 985                         $items[] = self::emailLink( $userId, $userText );
 986                 }
 987
 988                 Hooks::run( 'UserToolLinksEdit', [ $userId, $userText, &$items ] );
 989
 990                 if ( !$items ) {
 991                         return '';
 992                 }
 993
 994                 if ( $useParentheses ) {
 995                         return wfMessage( 'word-separator' )->escaped()
 996                                 . '<span class="mw-usertoollinks">'
 997                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
 998                                 . '</span>';
 999                 }
1000
1001                 $tools = [];
1002                 foreach ( $items as $tool ) {
1003                         $tools[] = Html::rawElement( 'span', [], $tool );
1004                 }
1005                 return ' <span class="mw-usertoollinks mw-changeslist-links">' .
1006                         implode( ' ', $tools ) . '</span>';
1007         }
1008
1009         /**
1010          * Alias for userToolLinks( $userId, $userText, true );
1011          * @since 1.16.3
1012          * @param int $userId User identifier
1013          * @param string $userText User name or IP address
1014          * @param int|null $edits User edit count (optional, for performance)
1015          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
1016          * @return string
1017          */
1018         public static function userToolLinksRedContribs(
1019                 $userId, $userText, $edits = null, $useParentheses = true
1020         ) {
1021                 return self::userToolLinks( $userId, $userText, true, 0, $edits, $useParentheses );
1022         }
1023
1024         /**
1025          * @since 1.16.3
1026          * @param int $userId User id in database.
1027          * @param string $userText User name in database.
1028          * @return string HTML fragment with user talk link
1029          */
1030         public static function userTalkLink( $userId, $userText ) {
1031                 if ( $userText === '' ) {
1032                         wfDebug( __METHOD__ . ' received an empty username. Are there database errors ' .
1033                                 'that need to be fixed?' );
1034                         return wfMessage( 'empty-username' )->parse();
1035                 }
1036
1037                 $userTalkPage = new TitleValue( NS_USER_TALK, strtr( $userText, ' ', '_' ) );
1038                 $moreLinkAttribs['class'] = 'mw-usertoollinks-talk';
1039
1040                 return self::link( $userTalkPage,
1041                         wfMessage( 'talkpagelinktext' )->escaped(),
1042                         $moreLinkAttribs
1043                 );
1044         }
1045
1046         /**
1047          * @since 1.16.3
1048          * @param int $userId
1049          * @param string $userText User name in database.
1050          * @return string HTML fragment with block link
1051          */
1052         public static function blockLink( $userId, $userText ) {
1053                 if ( $userText === '' ) {
1054                         wfDebug( __METHOD__ . ' received an empty username. Are there database errors ' .
1055                                 'that need to be fixed?' );
1056                         return wfMessage( 'empty-username' )->parse();
1057                 }
1058
1059                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1060                 $moreLinkAttribs['class'] = 'mw-usertoollinks-block';
1061
1062                 return self::link( $blockPage,
1063                         wfMessage( 'blocklink' )->escaped(),
1064                         $moreLinkAttribs
1065                 );
1066         }
1067
1068         /**
1069          * @param int $userId
1070          * @param string $userText User name in database.
1071          * @return string HTML fragment with e-mail user link
1072          */
1073         public static function emailLink( $userId, $userText ) {
1074                 if ( $userText === '' ) {
1075                         wfLogWarning( __METHOD__ . ' received an empty username. Are there database errors ' .
1076                                 'that need to be fixed?' );
1077                         return wfMessage( 'empty-username' )->parse();
1078                 }
1079
1080                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1081                 $moreLinkAttribs['class'] = 'mw-usertoollinks-mail';
1082                 return self::link( $emailPage,
1083                         wfMessage( 'emaillink' )->escaped(),
1084                         $moreLinkAttribs
1085                 );
1086         }
1087
1088         /**
1089          * Generate a user link if the current user is allowed to view it
1090          * @since 1.16.3
1091          * @param Revision $rev
1092          * @param bool $isPublic Show only if all users can see it
1093          * @return string HTML fragment
1094          */
1095         public static function revUserLink( $rev, $isPublic = false ) {
1096                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1097                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1098                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1099                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1100                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1101                 } else {
1102                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1103                 }
1104                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1105                         return '<span class="history-deleted">' . $link . '</span>';
1106                 }
1107                 return $link;
1108         }
1109
1110         /**
1111          * Generate a user tool link cluster if the current user is allowed to view it
1112          * @since 1.16.3
1113          * @param Revision $rev
1114          * @param bool $isPublic Show only if all users can see it
1115          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
1116          * @return string HTML
1117          */
1118         public static function revUserTools( $rev, $isPublic = false, $useParentheses = true ) {
1119                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1120                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1121                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1122                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1123                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1124                         $link = self::userLink( $userId, $userText )
1125                                 . self::userToolLinks( $userId, $userText, false, 0, null,
1126                                         $useParentheses );
1127                 } else {
1128                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1129                 }
1130                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1131                         return ' <span class="history-deleted mw-userlink">' . $link . '</span>';
1132                 }
1133                 return $link;
1134         }
1135
1136         /**
1137          * This function is called by all recent changes variants, by the page history,
1138          * and by the user contributions list. It is responsible for formatting edit
1139          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1140          * auto-generated comments (from section editing) and formats [[wikilinks]].
1141          *
1142          * @author Erik Moeller <moeller@scireview.de>
1143          * @since 1.16.3. $wikiId added in 1.26
1144          *
1145          * @param string $comment
1146          * @param LinkTarget|null $title LinkTarget object (to generate link to the section in
1147          *  autocomment) or null
1148          * @param bool $local Whether section links should refer to local page
1149          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1150          *  For use with external changes.
1151          *
1152          * @return string HTML
1153          */
1154         public static function formatComment(
1155                 $comment, $title = null, $local = false, $wikiId = null
1156         ) {
1157                 # Sanitize text a bit:
1158                 $comment = str_replace( "\n", " ", $comment );
1159                 # Allow HTML entities (for T15815)
1160                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1161
1162                 # Render autocomments and make links:
1163                 $comment = self::formatAutocomments( $comment, $title, $local, $wikiId );
1164                 return self::formatLinksInComment( $comment, $title, $local, $wikiId );
1165         }
1166
1167         /**
1168          * Converts autogenerated comments in edit summaries into section links.
1169          *
1170          * The pattern for autogen comments is / * foo * /, which makes for
1171          * some nasty regex.
1172          * We look for all comments, match any text before and after the comment,
1173          * add a separator where needed and format the comment itself with CSS
1174          * Called by Linker::formatComment.
1175          *
1176          * @param string $comment Comment text
1177          * @param LinkTarget|null $title An optional LinkTarget object used to links to sections
1178          * @param bool $local Whether section links should refer to local page
1179          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1180          *  as used by WikiMap.
1181          *
1182          * @return string Formatted comment (wikitext)
1183          */
1184         private static function formatAutocomments(
1185                 $comment, $title = null, $local = false, $wikiId = null
1186         ) {
1187                 // @todo $append here is something of a hack to preserve the status
1188                 // quo. Someone who knows more about bidi and such should decide
1189                 // (1) what sane rendering even *is* for an LTR edit summary on an RTL
1190                 // wiki, both when autocomments exist and when they don't, and
1191                 // (2) what markup will make that actually happen.
1192                 $append = '';
1193                 $comment = preg_replace_callback(
1194                         // To detect the presence of content before or after the
1195                         // auto-comment, we use capturing groups inside optional zero-width
1196                         // assertions. But older versions of PCRE can't directly make
1197                         // zero-width assertions optional, so wrap them in a non-capturing
1198                         // group.
1199                         '!(?:(?<=(.)))?/\*\s*(.*?)\s*\*/(?:(?=(.)))?!',
1200                         function ( $match ) use ( $title, $local, $wikiId, &$append ) {
1201                                 global $wgLang;
1202
1203                                 // Ensure all match positions are defined
1204                                 $match += [ '', '', '', '' ];
1205
1206                                 $pre = $match[1] !== '';
1207                                 $auto = $match[2];
1208                                 $post = $match[3] !== '';
1209                                 $comment = null;
1210
1211                                 Hooks::run(
1212                                         'FormatAutocomments',
1213                                         [ &$comment, $pre, $auto, $post, Title::castFromLinkTarget( $title ), $local,
1214                                         $wikiId ]
1215                                 );
1216
1217                                 if ( $comment === null ) {
1218                                         if ( $title ) {
1219                                                 $section = $auto;
1220                                                 # Remove links that a user may have manually put in the autosummary
1221                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1222                                                 $section = str_replace( [
1223                                                         '[[:',
1224                                                         '[[',
1225                                                         ']]'
1226                                                 ], '', $section );
1227
1228                                                 // We don't want any links in the auto text to be linked, but we still
1229                                                 // want to show any [[ ]]
1230                                                 $sectionText = str_replace( '[[', '&#91;[', $auto );
1231
1232                                                 $section = substr( Parser::guessSectionNameFromStrippedText( $section ), 1 );
1233                                                 // Support: HHVM (T222857)
1234                                                 // The guessSectionNameFromStrippedText method returns a non-empty string
1235                                                 // that starts with "#". Before PHP 7 (and still on HHVM) substr() would
1236                                                 // return false if the start offset is the end of the string.
1237                                                 // On PHP 7+, it gracefully returns empty string instead.
1238                                                 if ( $section !== '' && $section !== false ) {
1239                                                         if ( $local ) {
1240                                                                 $sectionTitle = new TitleValue( NS_MAIN, '', $section );
1241                                                         } else {
1242                                                                 $sectionTitle = $title->createFragmentTarget( $section );
1243                                                         }
1244                                                         $auto = Linker::makeCommentLink(
1245                                                                 $sectionTitle,
1246                                                                 $wgLang->getArrow() . $wgLang->getDirMark() . $sectionText,
1247                                                                 $wikiId,
1248                                                                 'noclasses'
1249                                                         );
1250                                                 }
1251                                         }
1252                                         if ( $pre ) {
1253                                                 # written summary $presep autocomment (summary /* section */)
1254                                                 $pre = wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1255                                         }
1256                                         if ( $post ) {
1257                                                 # autocomment $postsep written summary (/* section */ summary)
1258                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1259                                         }
1260                                         if ( $auto ) {
1261                                                 $auto = '<span dir="auto"><span class="autocomment">' . $auto . '</span>';
1262                                                 $append .= '</span>';
1263                                         }
1264                                         $comment = $pre . $auto;
1265                                 }
1266                                 return $comment;
1267                         },
1268                         $comment
1269                 );
1270                 return $comment . $append;
1271         }
1272
1273         /**
1274          * Formats wiki links and media links in text; all other wiki formatting
1275          * is ignored
1276          *
1277          * @since 1.16.3. $wikiId added in 1.26
1278          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1279          *
1280          * @param string $comment Text to format links in. WARNING! Since the output of this
1281          *      function is html, $comment must be sanitized for use as html. You probably want
1282          *      to pass $comment through Sanitizer::escapeHtmlAllowEntities() before calling
1283          *      this function.
1284          * @param LinkTarget|null $title An optional LinkTarget object used to links to sections
1285          * @param bool $local Whether section links should refer to local page
1286          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1287          *  as used by WikiMap.
1288          *
1289          * @return string HTML
1290          * @return-taint onlysafefor_html
1291          */
1292         public static function formatLinksInComment(
1293                 $comment, $title = null, $local = false, $wikiId = null
1294         ) {
1295                 return preg_replace_callback(
1296                         '/
1297                                 \[\[
1298                                 \s*+ # ignore leading whitespace, the *+ quantifier disallows backtracking
1299                                 :? # ignore optional leading colon
1300                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1301                                 (?:\|
1302                                         # 2. link text
1303                                         # Stop matching at ]] without relying on backtracking.
1304                                         ((?:]?[^\]])*+)
1305                                 )?
1306                                 \]\]
1307                                 ([^[]*) # 3. link trail (the text up until the next link)
1308                         /x',
1309                         function ( $match ) use ( $title, $local, $wikiId ) {
1310                                 $services = MediaWikiServices::getInstance();
1311
1312                                 $medians = '(?:';
1313                                 $medians .= preg_quote(
1314                                         $services->getNamespaceInfo()->getCanonicalName( NS_MEDIA ), '/' );
1315                                 $medians .= '|';
1316                                 $medians .= preg_quote(
1317                                         MediaWikiServices::getInstance()->getContentLanguage()->getNsText( NS_MEDIA ),
1318                                         '/'
1319                                 ) . '):';
1320
1321                                 $comment = $match[0];
1322
1323                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1324                                 if ( strpos( $match[1], '%' ) !== false ) {
1325                                         $match[1] = strtr(
1326                                                 rawurldecode( $match[1] ),
1327                                                 [ '<' => '&lt;', '>' => '&gt;' ]
1328                                         );
1329                                 }
1330
1331                                 # Handle link renaming [[foo|text]] will show link as "text"
1332                                 if ( $match[2] != "" ) {
1333                                         $text = $match[2];
1334                                 } else {
1335                                         $text = $match[1];
1336                                 }
1337                                 $submatch = [];
1338                                 $thelink = null;
1339                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1340                                         # Media link; trail not supported.
1341                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1342                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1343                                         if ( $title ) {
1344                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1345                                         }
1346                                 } else {
1347                                         # Other kind of link
1348                                         # Make sure its target is non-empty
1349                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1350                                                 $match[1] = substr( $match[1], 1 );
1351                                         }
1352                                         if ( $match[1] !== false && $match[1] !== '' ) {
1353                                                 if ( preg_match(
1354                                                         MediaWikiServices::getInstance()->getContentLanguage()->linkTrail(),
1355                                                         $match[3],
1356                                                         $submatch
1357                                                 ) ) {
1358                                                         $trail = $submatch[1];
1359                                                 } else {
1360                                                         $trail = "";
1361                                                 }
1362                                                 $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1363                                                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1364
1365                                                 $linkText = $text;
1366                                                 $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1367
1368                                                 Title::newFromText( $linkTarget );
1369                                                 try {
1370                                                         $target = MediaWikiServices::getInstance()->getTitleParser()->
1371                                                                 parseTitle( $linkTarget );
1372
1373                                                         if ( $target->getText() == '' && !$target->isExternal()
1374                                                                 && !$local && $title
1375                                                         ) {
1376                                                                 $target = $title->createFragmentTarget( $target->getFragment() );
1377                                                         }
1378
1379                                                         $thelink = Linker::makeCommentLink( $target, $linkText . $inside, $wikiId ) . $trail;
1380                                                 } catch ( MalformedTitleException $e ) {
1381                                                         // Fall through
1382                                                 }
1383                                         }
1384                                 }
1385                                 if ( $thelink ) {
1386                                         // If the link is still valid, go ahead and replace it in!
1387                                         $comment = preg_replace(
1388                                                 $linkRegexp,
1389                                                 StringUtils::escapeRegexReplacement( $thelink ),
1390                                                 $comment,
1391                                                 1
1392                                         );
1393                                 }
1394
1395                                 return $comment;
1396                         },
1397                         $comment
1398                 );
1399         }
1400
1401         /**
1402          * Generates a link to the given LinkTarget
1403          *
1404          * @note This is only public for technical reasons. It's not intended for use outside Linker.
1405          *
1406          * @param LinkTarget $linkTarget
1407          * @param string $text
1408          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1409          *  as used by WikiMap.
1410          * @param string|string[] $options See the $options parameter in Linker::link.
1411          *
1412          * @return string HTML link
1413          */
1414         public static function makeCommentLink(
1415                 LinkTarget $linkTarget, $text, $wikiId = null, $options = []
1416         ) {
1417                 if ( $wikiId !== null && !$linkTarget->isExternal() ) {
1418                         $link = self::makeExternalLink(
1419                                 WikiMap::getForeignURL(
1420                                         $wikiId,
1421                                         $linkTarget->getNamespace() === 0
1422                                                 ? $linkTarget->getDBkey()
1423                                                 : MediaWikiServices::getInstance()->getNamespaceInfo()->
1424                                                         getCanonicalName( $linkTarget->getNamespace() ) .
1425                                                         ':' . $linkTarget->getDBkey(),
1426                                         $linkTarget->getFragment()
1427                                 ),
1428                                 $text,
1429                                 /* escape = */ false // Already escaped
1430                         );
1431                 } else {
1432                         $link = self::link( $linkTarget, $text, [], [], $options );
1433                 }
1434
1435                 return $link;
1436         }
1437
1438         /**
1439          * @param LinkTarget $contextTitle
1440          * @param string $target
1441          * @param string &$text
1442          * @return string
1443          */
1444         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1445                 # Valid link forms:
1446                 # Foobar -- normal
1447                 # :Foobar -- override special treatment of prefix (images, language links)
1448                 # /Foobar -- convert to CurrentPage/Foobar
1449                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial and final / from text
1450                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1451                 # ../Foobar -- convert to CurrentPage/Foobar,
1452                 #              (from CurrentPage/CurrentSubPage)
1453                 # ../Foobar/ -- convert to CurrentPage/Foobar, use 'Foobar' as text
1454                 #              (from CurrentPage/CurrentSubPage)
1455
1456                 $ret = $target; # default return value is no change
1457
1458                 # Some namespaces don't allow subpages,
1459                 # so only perform processing if subpages are allowed
1460                 if (
1461                         $contextTitle && MediaWikiServices::getInstance()->getNamespaceInfo()->
1462                         hasSubpages( $contextTitle->getNamespace() )
1463                 ) {
1464                         $hash = strpos( $target, '#' );
1465                         if ( $hash !== false ) {
1466                                 $suffix = substr( $target, $hash );
1467                                 $target = substr( $target, 0, $hash );
1468                         } else {
1469                                 $suffix = '';
1470                         }
1471                         # T9425
1472                         $target = trim( $target );
1473                         $contextPrefixedText = MediaWikiServices::getInstance()->getTitleFormatter()->
1474                                 getPrefixedText( $contextTitle );
1475                         # Look at the first character
1476                         if ( $target != '' && $target[0] === '/' ) {
1477                                 # / at end means we don't want the slash to be shown
1478                                 $m = [];
1479                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1480                                 if ( $trailingSlashes ) {
1481                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1482                                 } else {
1483                                         $noslash = substr( $target, 1 );
1484                                 }
1485
1486                                 $ret = $contextPrefixedText . '/' . trim( $noslash ) . $suffix;
1487                                 if ( $text === '' ) {
1488                                         $text = $target . $suffix;
1489                                 } # this might be changed for ugliness reasons
1490                         } else {
1491                                 # check for .. subpage backlinks
1492                                 $dotdotcount = 0;
1493                                 $nodotdot = $target;
1494                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1495                                         ++$dotdotcount;
1496                                         $nodotdot = substr( $nodotdot, 3 );
1497                                 }
1498                                 if ( $dotdotcount > 0 ) {
1499                                         $exploded = explode( '/', $contextPrefixedText );
1500                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1501                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1502                                                 # / at the end means don't show full path
1503                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1504                                                         $nodotdot = rtrim( $nodotdot, '/' );
1505                                                         if ( $text === '' ) {
1506                                                                 $text = $nodotdot . $suffix;
1507                                                         }
1508                                                 }
1509                                                 $nodotdot = trim( $nodotdot );
1510                                                 if ( $nodotdot != '' ) {
1511                                                         $ret .= '/' . $nodotdot;
1512                                                 }
1513                                                 $ret .= $suffix;
1514                                         }
1515                                 }
1516                         }
1517                 }
1518
1519                 return $ret;
1520         }
1521
1522         /**
1523          * Wrap a comment in standard punctuation and formatting if
1524          * it's non-empty, otherwise return empty string.
1525          *
1526          * @since 1.16.3. $wikiId added in 1.26
1527          * @param string $comment
1528          * @param LinkTarget|null $title LinkTarget object (to generate link to section in autocomment)
1529          *  or null
1530          * @param bool $local Whether section links should refer to local page
1531          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1532          *  For use with external changes.
1533          *
1534          * @return string
1535          */
1536         public static function commentBlock(
1537                 $comment, $title = null, $local = false, $wikiId = null, $useParentheses = true
1538         ) {
1539                 // '*' used to be the comment inserted by the software way back
1540                 // in antiquity in case none was provided, here for backwards
1541                 // compatibility, acc. to brion -ævar
1542                 if ( $comment == '' || $comment == '*' ) {
1543                         return '';
1544                 }
1545                 $formatted = self::formatComment( $comment, $title, $local, $wikiId );
1546                 if ( $useParentheses ) {
1547                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1548                         $classNames = 'comment';
1549                 } else {
1550                         $classNames = 'comment comment--without-parentheses';
1551                 }
1552                 return " <span class=\"$classNames\">$formatted</span>";
1553         }
1554
1555         /**
1556          * Wrap and format the given revision's comment block, if the current
1557          * user is allowed to view it.
1558          *
1559          * @since 1.16.3
1560          * @param Revision $rev
1561          * @param bool $local Whether section links should refer to local page
1562          * @param bool $isPublic Show only if all users can see it
1563          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
1564          * @return string HTML fragment
1565          */
1566         public static function revComment( Revision $rev, $local = false, $isPublic = false,
1567                 $useParentheses = true
1568         ) {
1569                 if ( $rev->getComment( Revision::RAW ) == "" ) {
1570                         return "";
1571                 }
1572                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1573                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1574                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1575                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1576                                 $rev->getTitle(), $local, null, $useParentheses );
1577                 } else {
1578                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1579                 }
1580                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1581                         return " <span class=\"history-deleted comment\">$block</span>";
1582                 }
1583                 return $block;
1584         }
1585
1586         /**
1587          * @since 1.16.3
1588          * @param int $size
1589          * @return string
1590          */
1591         public static function formatRevisionSize( $size ) {
1592                 if ( $size == 0 ) {
1593                         $stxt = wfMessage( 'historyempty' )->escaped();
1594                 } else {
1595                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1596                 }
1597                 return "<span class=\"history-size mw-diff-bytes\">$stxt</span>";
1598         }
1599
1600         /**
1601          * Add another level to the Table of Contents
1602          *
1603          * @since 1.16.3
1604          * @return string
1605          */
1606         public static function tocIndent() {
1607                 return "\n<ul>\n";
1608         }
1609
1610         /**
1611          * Finish one or more sublevels on the Table of Contents
1612          *
1613          * @since 1.16.3
1614          * @param int $level
1615          * @return string
1616          */
1617         public static function tocUnindent( $level ) {
1618                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1619         }
1620
1621         /**
1622          * parameter level defines if we are on an indentation level
1623          *
1624          * @since 1.16.3
1625          * @param string $anchor
1626          * @param string $tocline
1627          * @param string $tocnumber
1628          * @param string $level
1629          * @param string|bool $sectionIndex
1630          * @return string
1631          */
1632         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1633                 $classes = "toclevel-$level";
1634                 if ( $sectionIndex !== false ) {
1635                         $classes .= " tocsection-$sectionIndex";
1636                 }
1637
1638                 // <li class="$classes"><a href="#$anchor"><span class="tocnumber">
1639                 // $tocnumber</span> <span class="toctext">$tocline</span></a>
1640                 return Html::openElement( 'li', [ 'class' => $classes ] )
1641                         . Html::rawElement( 'a',
1642                                 [ 'href' => "#$anchor" ],
1643                                 Html::element( 'span', [ 'class' => 'tocnumber' ], $tocnumber )
1644                                         . ' '
1645                                         . Html::rawElement( 'span', [ 'class' => 'toctext' ], $tocline )
1646                         );
1647         }
1648
1649         /**
1650          * End a Table Of Contents line.
1651          * tocUnindent() will be used instead if we're ending a line below
1652          * the new level.
1653          * @since 1.16.3
1654          * @return string
1655          */
1656         public static function tocLineEnd() {
1657                 return "</li>\n";
1658         }
1659
1660         /**
1661          * Wraps the TOC in a table and provides the hide/collapse javascript.
1662          *
1663          * @since 1.16.3
1664          * @param string $toc Html of the Table Of Contents
1665          * @param string|Language|bool|null $lang Language for the toc title, defaults to user language.
1666          *  The types string and bool are deprecated.
1667          * @return string Full html of the TOC
1668          */
1669         public static function tocList( $toc, $lang = null ) {
1670                 $lang = $lang ?? RequestContext::getMain()->getLanguage();
1671                 if ( !$lang instanceof Language ) {
1672                         wfDeprecated( __METHOD__ . ' with type other than Language for $lang', '1.33' );
1673                         $lang = wfGetLangObj( $lang );
1674                 }
1675
1676                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1677
1678                 return '<div id="toc" class="toc">'
1679                         . Html::element( 'input', [
1680                                 'type' => 'checkbox',
1681                                 'role' => 'button',
1682                                 'id' => 'toctogglecheckbox',
1683                                 'class' => 'toctogglecheckbox',
1684                                 'style' => 'display:none',
1685                         ] )
1686                         . Html::openElement( 'div', [
1687                                 'class' => 'toctitle',
1688                                 'lang' => $lang->getHtmlCode(),
1689                                 'dir' => $lang->getDir(),
1690                         ] )
1691                         . "<h2>$title</h2>"
1692                         . '<span class="toctogglespan">'
1693                         . Html::label( '', 'toctogglecheckbox', [
1694                                 'class' => 'toctogglelabel',
1695                         ] )
1696                         . '</span>'
1697                         . "</div>\n"
1698                         . $toc
1699                         . "</ul>\n</div>\n";
1700         }
1701
1702         /**
1703          * Generate a table of contents from a section tree.
1704          *
1705          * @since 1.16.3. $lang added in 1.17
1706          * @param array $tree Return value of ParserOutput::getSections()
1707          * @param string|Language|bool|null $lang Language for the toc title, defaults to user language.
1708          *  The types string and bool are deprecated.
1709          * @return string HTML fragment
1710          */
1711         public static function generateTOC( $tree, $lang = null ) {
1712                 $toc = '';
1713                 $lastLevel = 0;
1714                 foreach ( $tree as $section ) {
1715                         if ( $section['toclevel'] > $lastLevel ) {
1716                                 $toc .= self::tocIndent();
1717                         } elseif ( $section['toclevel'] < $lastLevel ) {
1718                                 $toc .= self::tocUnindent(
1719                                         $lastLevel - $section['toclevel'] );
1720                         } else {
1721                                 $toc .= self::tocLineEnd();
1722                         }
1723
1724                         $toc .= self::tocLine( $section['anchor'],
1725                                 $section['line'], $section['number'],
1726                                 $section['toclevel'], $section['index'] );
1727                         $lastLevel = $section['toclevel'];
1728                 }
1729                 $toc .= self::tocLineEnd();
1730                 return self::tocList( $toc, $lang );
1731         }
1732
1733         /**
1734          * Create a headline for content
1735          *
1736          * @since 1.16.3
1737          * @param int $level The level of the headline (1-6)
1738          * @param string $attribs Any attributes for the headline, starting with
1739          *   a space and ending with '>'
1740          *   This *must* be at least '>' for no attribs
1741          * @param string $anchor The anchor to give the headline (the bit after the #)
1742          * @param string $html HTML for the text of the header
1743          * @param string $link HTML to add for the section edit link
1744          * @param string|bool $fallbackAnchor A second, optional anchor to give for
1745          *   backward compatibility (false to omit)
1746          *
1747          * @return string HTML headline
1748          */
1749         public static function makeHeadline( $level, $attribs, $anchor, $html,
1750                 $link, $fallbackAnchor = false
1751         ) {
1752                 $anchorEscaped = htmlspecialchars( $anchor );
1753                 $fallback = '';
1754                 if ( $fallbackAnchor !== false && $fallbackAnchor !== $anchor ) {
1755                         $fallbackAnchor = htmlspecialchars( $fallbackAnchor );
1756                         $fallback = "<span id=\"$fallbackAnchor\"></span>";
1757                 }
1758                 return "<h$level$attribs"
1759                         . "$fallback<span class=\"mw-headline\" id=\"$anchorEscaped\">$html</span>"
1760                         . $link
1761                         . "</h$level>";
1762         }
1763
1764         /**
1765          * Split a link trail, return the "inside" portion and the remainder of the trail
1766          * as a two-element array
1767          * @param string $trail
1768          * @return array
1769          */
1770         static function splitTrail( $trail ) {
1771                 $regex = MediaWikiServices::getInstance()->getContentLanguage()->linkTrail();
1772                 $inside = '';
1773                 if ( $trail !== '' && preg_match( $regex, $trail, $m ) ) {
1774                         list( , $inside, $trail ) = $m;
1775                 }
1776                 return [ $inside, $trail ];
1777         }
1778
1779         /**
1780          * Generate a rollback link for a given revision.  Currently it's the
1781          * caller's responsibility to ensure that the revision is the top one. If
1782          * it's not, of course, the user will get an error message.
1783          *
1784          * If the calling page is called with the parameter &bot=1, all rollback
1785          * links also get that parameter. It causes the edit itself and the rollback
1786          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1787          * changes, so this allows sysops to combat a busy vandal without bothering
1788          * other users.
1789          *
1790          * If the option verify is set this function will return the link only in case the
1791          * revision can be reverted. Please note that due to performance limitations
1792          * it might be assumed that a user isn't the only contributor of a page while
1793          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1794          * work if $wgShowRollbackEditCount is disabled, so this can only function
1795          * as an additional check.
1796          *
1797          * If the option noBrackets is set the rollback link wont be enclosed in "[]".
1798          *
1799          * @since 1.16.3. $context added in 1.20. $options added in 1.21
1800          *
1801          * @param Revision $rev
1802          * @param IContextSource|null $context Context to use or null for the main context.
1803          * @param array $options
1804          * @return string
1805          */
1806         public static function generateRollback( $rev, IContextSource $context = null,
1807                 $options = [ 'verify' ]
1808         ) {
1809                 if ( $context === null ) {
1810                         $context = RequestContext::getMain();
1811                 }
1812
1813                 $editCount = false;
1814                 if ( in_array( 'verify', $options, true ) ) {
1815                         $editCount = self::getRollbackEditCount( $rev, true );
1816                         if ( $editCount === false ) {
1817                                 return '';
1818                         }
1819                 }
1820
1821                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1822
1823                 if ( !in_array( 'noBrackets', $options, true ) ) {
1824                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->escaped();
1825                 }
1826
1827                 if ( $context->getUser()->getBoolOption( 'showrollbackconfirmation' ) ) {
1828                         $stats = MediaWikiServices::getInstance()->getStatsdDataFactory();
1829                         $stats->increment( 'rollbackconfirmation.event.load' );
1830                         $context->getOutput()->addModules( 'mediawiki.page.rollback.confirmation' );
1831                 }
1832
1833                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1834         }
1835
1836         /**
1837          * This function will return the number of revisions which a rollback
1838          * would revert and, if $verify is set it will verify that a revision
1839          * can be reverted (that the user isn't the only contributor and the
1840          * revision we might rollback to isn't deleted). These checks can only
1841          * function as an additional check as this function only checks against
1842          * the last $wgShowRollbackEditCount edits.
1843          *
1844          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1845          * is set and the user is the only contributor of the page.
1846          *
1847          * @param Revision $rev
1848          * @param bool $verify Try to verify that this revision can really be rolled back
1849          * @return int|bool|null
1850          */
1851         public static function getRollbackEditCount( $rev, $verify ) {
1852                 global $wgShowRollbackEditCount;
1853                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1854                         // Nothing has happened, indicate this by returning 'null'
1855                         return null;
1856                 }
1857
1858                 $dbr = wfGetDB( DB_REPLICA );
1859
1860                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1861                 $revQuery = Revision::getQueryInfo();
1862                 $res = $dbr->select(
1863                         $revQuery['tables'],
1864                         [ 'rev_user_text' => $revQuery['fields']['rev_user_text'], 'rev_deleted' ],
1865                         // $rev->getPage() returns null sometimes
1866                         [ 'rev_page' => $rev->getTitle()->getArticleID() ],
1867                         __METHOD__,
1868                         [
1869                                 'USE INDEX' => [ 'revision' => 'page_timestamp' ],
1870                                 'ORDER BY' => 'rev_timestamp DESC',
1871                                 'LIMIT' => $wgShowRollbackEditCount + 1
1872                         ],
1873                         $revQuery['joins']
1874                 );
1875
1876                 $editCount = 0;
1877                 $moreRevs = false;
1878                 foreach ( $res as $row ) {
1879                         if ( $rev->getUserText( Revision::RAW ) != $row->rev_user_text ) {
1880                                 if ( $verify &&
1881                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1882                                                 || $row->rev_deleted & Revision::DELETED_USER
1883                                 ) ) {
1884                                         // If the user or the text of the revision we might rollback
1885                                         // to is deleted in some way we can't rollback. Similar to
1886                                         // the sanity checks in WikiPage::commitRollback.
1887                                         return false;
1888                                 }
1889                                 $moreRevs = true;
1890                                 break;
1891                         }
1892                         $editCount++;
1893                 }
1894
1895                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1896                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1897                         // and there weren't any other revisions. That means that the current user is the only
1898                         // editor, so we can't rollback
1899                         return false;
1900                 }
1901                 return $editCount;
1902         }
1903
1904         /**
1905          * Build a raw rollback link, useful for collections of "tool" links
1906          *
1907          * @since 1.16.3. $context added in 1.20. $editCount added in 1.21
1908          * @param Revision $rev
1909          * @param IContextSource|null $context Context to use or null for the main context.
1910          * @param int $editCount Number of edits that would be reverted
1911          * @return string HTML fragment
1912          */
1913         public static function buildRollbackLink( $rev, IContextSource $context = null,
1914                 $editCount = false
1915         ) {
1916                 global $wgShowRollbackEditCount, $wgMiserMode;
1917
1918                 // To config which pages are affected by miser mode
1919                 $disableRollbackEditCountSpecialPage = [ 'Recentchanges', 'Watchlist' ];
1920
1921                 if ( $context === null ) {
1922                         $context = RequestContext::getMain();
1923                 }
1924
1925                 $title = $rev->getTitle();
1926
1927                 $query = [
1928                         'action' => 'rollback',
1929                         'from' => $rev->getUserText(),
1930                         'token' => $context->getUser()->getEditToken( 'rollback' ),
1931                 ];
1932
1933                 $attrs = [
1934                         'data-mw' => 'interface',
1935                         'title' => $context->msg( 'tooltip-rollback' )->text()
1936                 ];
1937
1938                 $options = [ 'known', 'noclasses' ];
1939
1940                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1941                         //T17999
1942                         $query['hidediff'] = '1';
1943                         $query['bot'] = '1';
1944                 }
1945
1946                 $disableRollbackEditCount = false;
1947                 if ( $wgMiserMode ) {
1948                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1949                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1950                                         $disableRollbackEditCount = true;
1951                                         break;
1952                                 }
1953                         }
1954                 }
1955
1956                 if ( !$disableRollbackEditCount
1957                         && is_int( $wgShowRollbackEditCount )
1958                         && $wgShowRollbackEditCount > 0
1959                 ) {
1960                         if ( !is_numeric( $editCount ) ) {
1961                                 $editCount = self::getRollbackEditCount( $rev, false );
1962                         }
1963
1964                         if ( $editCount > $wgShowRollbackEditCount ) {
1965                                 $html = $context->msg( 'rollbacklinkcount-morethan' )
1966                                         ->numParams( $wgShowRollbackEditCount )->parse();
1967                         } else {
1968                                 $html = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1969                         }
1970
1971                         return self::link( $title, $html, $attrs, $query, $options );
1972                 }
1973
1974                 $html = $context->msg( 'rollbacklink' )->escaped();
1975                 return self::link( $title, $html, $attrs, $query, $options );
1976         }
1977
1978         /**
1979          * Returns HTML for the "hidden categories on this page" list.
1980          *
1981          * @since 1.16.3
1982          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
1983          *   or similar
1984          * @return string HTML output
1985          */
1986         public static function formatHiddenCategories( $hiddencats ) {
1987                 $outText = '';
1988                 if ( count( $hiddencats ) > 0 ) {
1989                         # Construct the HTML
1990                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
1991                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
1992                         $outText .= "</div><ul>\n";
1993
1994                         foreach ( $hiddencats as $titleObj ) {
1995                                 # If it's hidden, it must exist - no need to check with a LinkBatch
1996                                 $outText .= '<li>'
1997                                         . self::link( $titleObj, null, [], [], 'known' )
1998                                         . "</li>\n";
1999                         }
2000                         $outText .= '</ul>';
2001                 }
2002                 return $outText;
2003         }
2004
2005         /**
2006          * Given the id of an interface element, constructs the appropriate title
2007          * attribute from the system messages.  (Note, this is usually the id but
2008          * isn't always, because sometimes the accesskey needs to go on a different
2009          * element than the id, for reverse-compatibility, etc.)
2010          *
2011          * @since 1.16.3 $msgParams added in 1.27
2012          * @param string $name Id of the element, minus prefixes.
2013          * @param string|array|null $options Null, string or array with some of the following options:
2014          *   - 'withaccess' to add an access-key hint
2015          *   - 'nonexisting' to add an accessibility hint that page does not exist
2016          * @param array $msgParams Parameters to pass to the message
2017          *
2018          * @return string Contents of the title attribute (which you must HTML-
2019          *   escape), or false for no title attribute
2020          */
2021         public static function titleAttrib( $name, $options = null, array $msgParams = [] ) {
2022                 $message = wfMessage( "tooltip-$name", $msgParams );
2023                 if ( !$message->exists() ) {
2024                         $tooltip = false;
2025                 } else {
2026                         $tooltip = $message->text();
2027                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2028                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2029                         # Message equal to '-' means suppress it.
2030                         if ( $tooltip == '-' ) {
2031                                 $tooltip = false;
2032                         }
2033                 }
2034
2035                 $options = (array)$options;
2036
2037                 if ( in_array( 'nonexisting', $options ) ) {
2038                         $tooltip = wfMessage( 'red-link-title', $tooltip ?: '' )->text();
2039                 }
2040                 if ( in_array( 'withaccess', $options ) ) {
2041                         $accesskey = self::accesskey( $name );
2042                         if ( $accesskey !== false ) {
2043                                 // Should be build the same as in jquery.accessKeyLabel.js
2044                                 if ( $tooltip === false || $tooltip === '' ) {
2045                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2046                                 } else {
2047                                         $tooltip .= wfMessage( 'word-separator' )->text();
2048                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2049                                 }
2050                         }
2051                 }
2052
2053                 return $tooltip;
2054         }
2055
2056         public static $accesskeycache;
2057
2058         /**
2059          * Given the id of an interface element, constructs the appropriate
2060          * accesskey attribute from the system messages.  (Note, this is usually
2061          * the id but isn't always, because sometimes the accesskey needs to go on
2062          * a different element than the id, for reverse-compatibility, etc.)
2063          *
2064          * @since 1.16.3
2065          * @param string $name Id of the element, minus prefixes.
2066          * @return string Contents of the accesskey attribute (which you must HTML-
2067          *   escape), or false for no accesskey attribute
2068          */
2069         public static function accesskey( $name ) {
2070                 if ( isset( self::$accesskeycache[$name] ) ) {
2071                         return self::$accesskeycache[$name];
2072                 }
2073
2074                 $message = wfMessage( "accesskey-$name" );
2075
2076                 if ( !$message->exists() ) {
2077                         $accesskey = false;
2078                 } else {
2079                         $accesskey = $message->plain();
2080                         if ( $accesskey === '' || $accesskey === '-' ) {
2081                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2082                                 # attribute, but this is broken for accesskey: that might be a useful
2083                                 # value.
2084                                 $accesskey = false;
2085                         }
2086                 }
2087
2088                 self::$accesskeycache[$name] = $accesskey;
2089                 return self::$accesskeycache[$name];
2090         }
2091
2092         /**
2093          * Get a revision-deletion link, or disabled link, or nothing, depending
2094          * on user permissions & the settings on the revision.
2095          *
2096          * Will use forward-compatible revision ID in the Special:RevDelete link
2097          * if possible, otherwise the timestamp-based ID which may break after
2098          * undeletion.
2099          *
2100          * @param User $user
2101          * @param Revision $rev
2102          * @param LinkTarget $title
2103          * @return string HTML fragment
2104          */
2105         public static function getRevDeleteLink( User $user, Revision $rev, LinkTarget $title ) {
2106                 $canHide = $user->isAllowed( 'deleterevision' );
2107                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2108                         return '';
2109                 }
2110
2111                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2112                         return self::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2113                 }
2114                 $prefixedDbKey = MediaWikiServices::getInstance()->getTitleFormatter()->
2115                         getPrefixedDBkey( $title );
2116                 if ( $rev->getId() ) {
2117                         // RevDelete links using revision ID are stable across
2118                         // page deletion and undeletion; use when possible.
2119                         $query = [
2120                                 'type' => 'revision',
2121                                 'target' => $prefixedDbKey,
2122                                 'ids' => $rev->getId()
2123                         ];
2124                 } else {
2125                         // Older deleted entries didn't save a revision ID.
2126                         // We have to refer to these by timestamp, ick!
2127                         $query = [
2128                                 'type' => 'archive',
2129                                 'target' => $prefixedDbKey,
2130                                 'ids' => $rev->getTimestamp()
2131                         ];
2132                 }
2133                 return self::revDeleteLink( $query,
2134                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2135         }
2136
2137         /**
2138          * Creates a (show/hide) link for deleting revisions/log entries
2139          *
2140          * @param array $query Query parameters to be passed to link()
2141          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2142          * @param bool $delete Set to true to use (show/hide) rather than (show)
2143          *
2144          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2145          * span to allow for customization of appearance with CSS
2146          */
2147         public static function revDeleteLink( $query = [], $restricted = false, $delete = true ) {
2148                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2149                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2150                 $html = wfMessage( $msgKey )->escaped();
2151                 $tag = $restricted ? 'strong' : 'span';
2152                 $link = self::link( $sp, $html, [], $query, [ 'known', 'noclasses' ] );
2153                 return Xml::tags(
2154                         $tag,
2155                         [ 'class' => 'mw-revdelundel-link' ],
2156                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2157                 );
2158         }
2159
2160         /**
2161          * Creates a dead (show/hide) link for deleting revisions/log entries
2162          *
2163          * @since 1.16.3
2164          * @param bool $delete Set to true to use (show/hide) rather than (show)
2165          *
2166          * @return string HTML text wrapped in a span to allow for customization
2167          * of appearance with CSS
2168          */
2169         public static function revDeleteLinkDisabled( $delete = true ) {
2170                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2171                 $html = wfMessage( $msgKey )->escaped();
2172                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2173                 return Xml::tags( 'span', [ 'class' => 'mw-revdelundel-link' ], $htmlParentheses );
2174         }
2175
2176         /**
2177          * Returns the attributes for the tooltip and access key.
2178          *
2179          * @since 1.16.3. $msgParams introduced in 1.27
2180          * @param string $name
2181          * @param array $msgParams Params for constructing the message
2182          * @param string|array|null $options Options to be passed to titleAttrib.
2183          *
2184          * @see Linker::titleAttrib for what options could be passed to $options.
2185          *
2186          * @return array
2187          */
2188         public static function tooltipAndAccesskeyAttribs(
2189                 $name,
2190                 array $msgParams = [],
2191                 $options = null
2192         ) {
2193                 $options = (array)$options;
2194                 $options[] = 'withaccess';
2195
2196                 $attribs = [
2197                         'title' => self::titleAttrib( $name, $options, $msgParams ),
2198                         'accesskey' => self::accesskey( $name )
2199                 ];
2200                 if ( $attribs['title'] === false ) {
2201                         unset( $attribs['title'] );
2202                 }
2203                 if ( $attribs['accesskey'] === false ) {
2204                         unset( $attribs['accesskey'] );
2205                 }
2206                 return $attribs;
2207         }
2208
2209         /**
2210          * Returns raw bits of HTML, use titleAttrib()
2211          * @since 1.16.3
2212          * @param string $name
2213          * @param array|null $options
2214          * @return null|string
2215          */
2216         public static function tooltip( $name, $options = null ) {
2217                 $tooltip = self::titleAttrib( $name, $options );
2218                 if ( $tooltip === false ) {
2219                         return '';
2220                 }
2221                 return Xml::expandAttributes( [
2222                         'title' => $tooltip
2223                 ] );
2224         }
2225
2226 }