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                 if ( is_string( $query ) ) {
  93                         // some functions withing core using this still hand over query strings
  94                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
  95                         $query = wfCgiToArray( $query );
  96                 }
  97
  98                 $services = MediaWikiServices::getInstance();
  99                 $options = (array)$options;
 100                 if ( $options ) {
 101                         // Custom options, create new LinkRenderer
 102                         if ( !isset( $options['stubThreshold'] ) ) {
 103                                 $defaultLinkRenderer = $services->getLinkRenderer();
 104                                 $options['stubThreshold'] = $defaultLinkRenderer->getStubThreshold();
 105                         }
 106                         $linkRenderer = $services->getLinkRendererFactory()
 107                                 ->createFromLegacyOptions( $options );
 108                 } else {
 109                         $linkRenderer = $services->getLinkRenderer();
 110                 }
 111
 112                 if ( $html !== null ) {
 113                         $text = new HtmlArmor( $html );
 114                 } else {
 115                         $text = null;
 116                 }
 117
 118                 if ( in_array( 'known', $options, true ) ) {
 119                         return $linkRenderer->makeKnownLink( $target, $text, $customAttribs, $query );
 120                 }
 121
 122                 if ( in_array( 'broken', $options, true ) ) {
 123                         return $linkRenderer->makeBrokenLink( $target, $text, $customAttribs, $query );
 124                 }
 125
 126                 if ( in_array( 'noclasses', $options, true ) ) {
 127                         return $linkRenderer->makePreloadedLink( $target, $text, '', $customAttribs, $query );
 128                 }
 129
 130                 return $linkRenderer->makeLink( $target, $text, $customAttribs, $query );
 131         }
 132
 133         /**
 134          * Identical to link(), except $options defaults to 'known'.
 135          *
 136          * @since 1.16.3
 137          * @deprecated since 1.28, use MediaWiki\Linker\LinkRenderer instead
 138          * @see Linker::link
 139          * @param LinkTarget $target
 140          * @param string $html
 141          * @param array $customAttribs
 142          * @param array $query
 143          * @param string|array $options
 144          * @return string
 145          */
 146         public static function linkKnown(
 147                 $target, $html = null, $customAttribs = [],
 148                 $query = [], $options = [ 'known' ]
 149         ) {
 150                 return self::link( $target, $html, $customAttribs, $query, $options );
 151         }
 152
 153         /**
 154          * Make appropriate markup for a link to the current article. This is since
 155          * MediaWiki 1.29.0 rendered as an <a> tag without an href and with a class
 156          * showing the link text. The calling sequence is the same as for the other
 157          * make*LinkObj static functions, but $query is not used.
 158          *
 159          * @since 1.16.3
 160          * @param LinkTarget $nt
 161          * @param string $html [optional]
 162          * @param string $query [optional]
 163          * @param string $trail [optional]
 164          * @param string $prefix [optional]
 165          *
 166          * @return string
 167          */
 168         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 169                 $nt = Title::newFromLinkTarget( $nt );
 170                 $ret = "<a class=\"mw-selflink selflink\">{$prefix}{$html}</a>{$trail}";
 171                 if ( !Hooks::run( 'SelfLinkBegin', [ $nt, &$html, &$trail, &$prefix, &$ret ] ) ) {
 172                         return $ret;
 173                 }
 174
 175                 if ( $html == '' ) {
 176                         $html = htmlspecialchars( $nt->getPrefixedText() );
 177                 }
 178                 list( $inside, $trail ) = self::splitTrail( $trail );
 179                 return "<a class=\"mw-selflink selflink\">{$prefix}{$html}{$inside}</a>{$trail}";
 180         }
 181
 182         /**
 183          * Get a message saying that an invalid title was encountered.
 184          * This should be called after a method like Title::makeTitleSafe() returned
 185          * a value indicating that the title object is invalid.
 186          *
 187          * @param IContextSource $context Context to use to get the messages
 188          * @param int $namespace Namespace number
 189          * @param string $title Text of the title, without the namespace part
 190          * @return string
 191          */
 192         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 193                 // First we check whether the namespace exists or not.
 194                 if ( MediaWikiServices::getInstance()->getNamespaceInfo()->exists( $namespace ) ) {
 195                         if ( $namespace == NS_MAIN ) {
 196                                 $name = $context->msg( 'blanknamespace' )->text();
 197                         } else {
 198                                 $name = MediaWikiServices::getInstance()->getContentLanguage()->
 199                                         getFormattedNsText( $namespace );
 200                         }
 201                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 202                 }
 203
 204                 return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 205         }
 206
 207         /**
 208          * @since 1.16.3
 209          * @param LinkTarget $target
 210          * @return LinkTarget
 211          */
 212         public static function normaliseSpecialPage( LinkTarget $target ) {
 213                 if ( $target->getNamespace() == NS_SPECIAL && !$target->isExternal() ) {
 214                         list( $name, $subpage ) = MediaWikiServices::getInstance()->getSpecialPageFactory()->
 215                                 resolveAlias( $target->getDBkey() );
 216                         if ( $name ) {
 217                                 return SpecialPage::getTitleValueFor( $name, $subpage, $target->getFragment() );
 218                         }
 219                 }
 220
 221                 return $target;
 222         }
 223
 224         /**
 225          * Returns the filename part of an url.
 226          * Used as alternative text for external images.
 227          *
 228          * @param string $url
 229          *
 230          * @return string
 231          */
 232         private static function fnamePart( $url ) {
 233                 $basename = strrchr( $url, '/' );
 234                 if ( $basename === false ) {
 235                         $basename = $url;
 236                 } else {
 237                         $basename = substr( $basename, 1 );
 238                 }
 239                 return $basename;
 240         }
 241
 242         /**
 243          * Return the code for images which were added via external links,
 244          * via Parser::maybeMakeExternalImage().
 245          *
 246          * @since 1.16.3
 247          * @param string $url
 248          * @param string $alt
 249          *
 250          * @return string
 251          */
 252         public static function makeExternalImage( $url, $alt = '' ) {
 253                 if ( $alt == '' ) {
 254                         $alt = self::fnamePart( $url );
 255                 }
 256                 $img = '';
 257                 $success = Hooks::run( 'LinkerMakeExternalImage', [ &$url, &$alt, &$img ] );
 258                 if ( !$success ) {
 259                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 260                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 261                         return $img;
 262                 }
 263                 return Html::element( 'img',
 264                         [
 265                                 'src' => $url,
 266                                 'alt' => $alt
 267                         ]
 268                 );
 269         }
 270
 271         /**
 272          * Given parameters derived from [[Image:Foo|options...]], generate the
 273          * HTML that that syntax inserts in the page.
 274          *
 275          * @param Parser $parser
 276          * @param LinkTarget $title LinkTarget object of the file (not the currently viewed page)
 277          * @param File $file File object, or false if it doesn't exist
 278          * @param array $frameParams Associative array of parameters external to the media handler.
 279          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 280          *     will often be false.
 281          *          thumbnail       If present, downscale and frame
 282          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 283          *          framed          Shows image in original size in a frame
 284          *          frameless       Downscale but don't frame
 285          *          upright         If present, tweak default sizes for portrait orientation
 286          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 287          *          border          If present, show a border around the image
 288          *          align           Horizontal alignment (left, right, center, none)
 289          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 290          *                          bottom, text-bottom)
 291          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 292          *          class           HTML for image classes. Plain text.
 293          *          caption         HTML for image caption.
 294          *          link-url        URL to link to
 295          *          link-title      LinkTarget object to link to
 296          *          link-target     Value for the target attribute, only with link-url
 297          *          no-link         Boolean, suppress description link
 298          *          targetlang      (optional) Target language code, see Parser::getTargetLanguage()
 299          *
 300          * @param array $handlerParams Associative array of media handler parameters, to be passed
 301          *       to transform(). Typical keys are "width" and "page".
 302          * @param string|bool $time Timestamp of the file, set as false for current
 303          * @param string $query Query params for desc url
 304          * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
 305          * @since 1.20
 306          * @return string HTML for an image, with links, wrappers, etc.
 307          */
 308         public static function makeImageLink( Parser $parser, LinkTarget $title,
 309                 $file, $frameParams = [], $handlerParams = [], $time = false,
 310                 $query = "", $widthOption = null
 311         ) {
 312                 $title = Title::newFromLinkTarget( $title );
 313                 $res = null;
 314                 $dummy = new DummyLinker;
 315                 if ( !Hooks::run( 'ImageBeforeProduceHTML', [ &$dummy, &$title,
 316                         &$file, &$frameParams, &$handlerParams, &$time, &$res,
 317                         $parser, &$query, &$widthOption
 318                 ] ) ) {
 319                         return $res;
 320                 }
 321
 322                 if ( $file && !$file->allowInlineDisplay() ) {
 323                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 324                         return self::link( $title );
 325                 }
 326
 327                 // Clean up parameters
 328                 $page = $handlerParams['page'] ?? false;
 329                 if ( !isset( $frameParams['align'] ) ) {
 330                         $frameParams['align'] = '';
 331                 }
 332                 if ( !isset( $frameParams['alt'] ) ) {
 333                         $frameParams['alt'] = '';
 334                 }
 335                 if ( !isset( $frameParams['title'] ) ) {
 336                         $frameParams['title'] = '';
 337                 }
 338                 if ( !isset( $frameParams['class'] ) ) {
 339                         $frameParams['class'] = '';
 340                 }
 341
 342                 $prefix = $postfix = '';
 343
 344                 if ( $frameParams['align'] == 'center' ) {
 345                         $prefix = '<div class="center">';
 346                         $postfix = '</div>';
 347                         $frameParams['align'] = 'none';
 348                 }
 349                 if ( $file && !isset( $handlerParams['width'] ) ) {
 350                         if ( isset( $handlerParams['height'] ) && $file->isVectorized() ) {
 351                                 // If its a vector image, and user only specifies height
 352                                 // we don't want it to be limited by its "normal" width.
 353                                 global $wgSVGMaxSize;
 354                                 $handlerParams['width'] = $wgSVGMaxSize;
 355                         } else {
 356                                 $handlerParams['width'] = $file->getWidth( $page );
 357                         }
 358
 359                         if ( isset( $frameParams['thumbnail'] )
 360                                 || isset( $frameParams['manualthumb'] )
 361                                 || isset( $frameParams['framed'] )
 362                                 || isset( $frameParams['frameless'] )
 363                                 || !$handlerParams['width']
 364                         ) {
 365                                 global $wgThumbLimits, $wgThumbUpright;
 366
 367                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 368                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 369                                 }
 370
 371                                 // Reduce width for upright images when parameter 'upright' is used
 372                                 if ( isset( $frameParams['upright'] ) && $frameParams['upright'] == 0 ) {
 373                                         $frameParams['upright'] = $wgThumbUpright;
 374                                 }
 375
 376                                 // For caching health: If width scaled down due to upright
 377                                 // parameter, round to full __0 pixel to avoid the creation of a
 378                                 // lot of odd thumbs.
 379                                 $prefWidth = isset( $frameParams['upright'] ) ?
 380                                         round( $wgThumbLimits[$widthOption] * $frameParams['upright'], -1 ) :
 381                                         $wgThumbLimits[$widthOption];
 382
 383                                 // Use width which is smaller: real image width or user preference width
 384                                 // Unless image is scalable vector.
 385                                 if ( !isset( $handlerParams['height'] ) && ( $handlerParams['width'] <= 0 ||
 386                                                 $prefWidth < $handlerParams['width'] || $file->isVectorized() ) ) {
 387                                         $handlerParams['width'] = $prefWidth;
 388                                 }
 389                         }
 390                 }
 391
 392                 if ( isset( $frameParams['thumbnail'] ) || isset( $frameParams['manualthumb'] )
 393                         || isset( $frameParams['framed'] )
 394                 ) {
 395                         # Create a thumbnail. Alignment depends on the writing direction of
 396                         # the page content language (right-aligned for LTR languages,
 397                         # left-aligned for RTL languages)
 398                         # If a thumbnail width has not been provided, it is set
 399                         # to the default user option as specified in Language*.php
 400                         if ( $frameParams['align'] == '' ) {
 401                                 $frameParams['align'] = $parser->getTargetLanguage()->alignEnd();
 402                         }
 403                         return $prefix .
 404                                 self::makeThumbLink2( $title, $file, $frameParams, $handlerParams, $time, $query ) .
 405                                 $postfix;
 406                 }
 407
 408                 if ( $file && isset( $frameParams['frameless'] ) ) {
 409                         $srcWidth = $file->getWidth( $page );
 410                         # For "frameless" option: do not present an image bigger than the
 411                         # source (for bitmap-style images). This is the same behavior as the
 412                         # "thumb" option does it already.
 413                         if ( $srcWidth && !$file->mustRender() && $handlerParams['width'] > $srcWidth ) {
 414                                 $handlerParams['width'] = $srcWidth;
 415                         }
 416                 }
 417
 418                 if ( $file && isset( $handlerParams['width'] ) ) {
 419                         # Create a resized image, without the additional thumbnail features
 420                         $thumb = $file->transform( $handlerParams );
 421                 } else {
 422                         $thumb = false;
 423                 }
 424
 425                 if ( !$thumb ) {
 426                         $s = self::makeBrokenImageLinkObj( $title, $frameParams['title'], '', '', '', $time == true );
 427                 } else {
 428                         self::processResponsiveImages( $file, $thumb, $handlerParams );
 429                         $params = [
 430                                 'alt' => $frameParams['alt'],
 431                                 'title' => $frameParams['title'],
 432                                 'valign' => $frameParams['valign'] ?? false,
 433                                 'img-class' => $frameParams['class'] ];
 434                         if ( isset( $frameParams['border'] ) ) {
 435                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 436                         }
 437                         $params = self::getImageLinkMTOParams( $frameParams, $query, $parser ) + $params;
 438
 439                         $s = $thumb->toHtml( $params );
 440                 }
 441                 if ( $frameParams['align'] != '' ) {
 442                         $s = Html::rawElement(
 443                                 'div',
 444                                 [ 'class' => 'float' . $frameParams['align'] ],
 445                                 $s
 446                         );
 447                 }
 448                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 449         }
 450
 451         /**
 452          * Get the link parameters for MediaTransformOutput::toHtml() from given
 453          * frame parameters supplied by the Parser.
 454          * @param array $frameParams The frame parameters
 455          * @param string $query An optional query string to add to description page links
 456          * @param Parser|null $parser
 457          * @return array
 458          */
 459         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 460                 $mtoParams = [];
 461                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 462                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 463                         if ( isset( $frameParams['link-target'] ) ) {
 464                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 465                         }
 466                         if ( $parser ) {
 467                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 468                                 foreach ( $extLinkAttrs as $name => $val ) {
 469                                         // Currently could include 'rel' and 'target'
 470                                         $mtoParams['parser-extlink-' . $name] = $val;
 471                                 }
 472                         }
 473                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 474                         $mtoParams['custom-title-link'] = Title::newFromLinkTarget(
 475                                 self::normaliseSpecialPage( $frameParams['link-title'] )
 476                         );
 477                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 478                         // No link
 479                 } else {
 480                         $mtoParams['desc-link'] = true;
 481                         $mtoParams['desc-query'] = $query;
 482                 }
 483                 return $mtoParams;
 484         }
 485
 486         /**
 487          * Make HTML for a thumbnail including image, border and caption
 488          * @param LinkTarget $title
 489          * @param File|bool $file File object or false if it doesn't exist
 490          * @param string $label
 491          * @param string $alt
 492          * @param string $align
 493          * @param array $params
 494          * @param bool $framed
 495          * @param string $manualthumb
 496          * @return string
 497          */
 498         public static function makeThumbLinkObj( LinkTarget $title, $file, $label = '', $alt = '',
 499                 $align = 'right', $params = [], $framed = false, $manualthumb = ""
 500         ) {
 501                 $frameParams = [
 502                         'alt' => $alt,
 503                         'caption' => $label,
 504                         'align' => $align
 505                 ];
 506                 if ( $framed ) {
 507                         $frameParams['framed'] = true;
 508                 }
 509                 if ( $manualthumb ) {
 510                         $frameParams['manualthumb'] = $manualthumb;
 511                 }
 512                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 513         }
 514
 515         /**
 516          * @param LinkTarget $title
 517          * @param File $file
 518          * @param array $frameParams
 519          * @param array $handlerParams
 520          * @param bool $time
 521          * @param string $query
 522          * @return string
 523          */
 524         public static function makeThumbLink2( LinkTarget $title, $file, $frameParams = [],
 525                 $handlerParams = [], $time = false, $query = ""
 526         ) {
 527                 $exists = $file && $file->exists();
 528
 529                 $page = $handlerParams['page'] ?? false;
 530                 if ( !isset( $frameParams['align'] ) ) {
 531                         $frameParams['align'] = 'right';
 532                 }
 533                 if ( !isset( $frameParams['alt'] ) ) {
 534                         $frameParams['alt'] = '';
 535                 }
 536                 if ( !isset( $frameParams['title'] ) ) {
 537                         $frameParams['title'] = '';
 538                 }
 539                 if ( !isset( $frameParams['caption'] ) ) {
 540                         $frameParams['caption'] = '';
 541                 }
 542
 543                 if ( empty( $handlerParams['width'] ) ) {
 544                         // Reduce width for upright images when parameter 'upright' is used
 545                         $handlerParams['width'] = isset( $frameParams['upright'] ) ? 130 : 180;
 546                 }
 547                 $thumb = false;
 548                 $noscale = false;
 549                 $manualthumb = false;
 550
 551                 if ( !$exists ) {
 552                         $outerWidth = $handlerParams['width'] + 2;
 553                 } else {
 554                         if ( isset( $frameParams['manualthumb'] ) ) {
 555                                 # Use manually specified thumbnail
 556                                 $manual_title = Title::makeTitleSafe( NS_FILE, $frameParams['manualthumb'] );
 557                                 if ( $manual_title ) {
 558                                         $manual_img = wfFindFile( $manual_title );
 559                                         if ( $manual_img ) {
 560                                                 $thumb = $manual_img->getUnscaledThumb( $handlerParams );
 561                                                 $manualthumb = true;
 562                                         } else {
 563                                                 $exists = false;
 564                                         }
 565                                 }
 566                         } elseif ( isset( $frameParams['framed'] ) ) {
 567                                 // Use image dimensions, don't scale
 568                                 $thumb = $file->getUnscaledThumb( $handlerParams );
 569                                 $noscale = true;
 570                         } else {
 571                                 # Do not present an image bigger than the source, for bitmap-style images
 572                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 573                                 $srcWidth = $file->getWidth( $page );
 574                                 if ( $srcWidth && !$file->mustRender() && $handlerParams['width'] > $srcWidth ) {
 575                                         $handlerParams['width'] = $srcWidth;
 576                                 }
 577                                 $thumb = $file->transform( $handlerParams );
 578                         }
 579
 580                         if ( $thumb ) {
 581                                 $outerWidth = $thumb->getWidth() + 2;
 582                         } else {
 583                                 $outerWidth = $handlerParams['width'] + 2;
 584                         }
 585                 }
 586
 587                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 588                 # So we don't need to pass it here in $query. However, the URL for the
 589                 # zoom icon still needs it, so we make a unique query for it. See T16771
 590                 $url = Title::newFromLinkTarget( $title )->getLocalURL( $query );
 591                 if ( $page ) {
 592                         $url = wfAppendQuery( $url, [ 'page' => $page ] );
 593                 }
 594                 if ( $manualthumb
 595                         && !isset( $frameParams['link-title'] )
 596                         && !isset( $frameParams['link-url'] )
 597                         && !isset( $frameParams['no-link'] ) ) {
 598                         $frameParams['link-url'] = $url;
 599                 }
 600
 601                 $s = "<div class=\"thumb t{$frameParams['align']}\">"
 602                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 603
 604                 if ( !$exists ) {
 605                         $s .= self::makeBrokenImageLinkObj( $title, $frameParams['title'], '', '', '', $time == true );
 606                         $zoomIcon = '';
 607                 } elseif ( !$thumb ) {
 608                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 609                         $zoomIcon = '';
 610                 } else {
 611                         if ( !$noscale && !$manualthumb ) {
 612                                 self::processResponsiveImages( $file, $thumb, $handlerParams );
 613                         }
 614                         $params = [
 615                                 'alt' => $frameParams['alt'],
 616                                 'title' => $frameParams['title'],
 617                                 'img-class' => ( isset( $frameParams['class'] ) && $frameParams['class'] !== ''
 618                                         ? $frameParams['class'] . ' '
 619                                         : '' ) . 'thumbimage'
 620                         ];
 621                         $params = self::getImageLinkMTOParams( $frameParams, $query ) + $params;
 622                         $s .= $thumb->toHtml( $params );
 623                         if ( isset( $frameParams['framed'] ) ) {
 624                                 $zoomIcon = "";
 625                         } else {
 626                                 $zoomIcon = Html::rawElement( 'div', [ 'class' => 'magnify' ],
 627                                         Html::rawElement( 'a', [
 628                                                 'href' => $url,
 629                                                 'class' => 'internal',
 630                                                 'title' => wfMessage( 'thumbnail-more' )->text() ],
 631                                                 "" ) );
 632                         }
 633                 }
 634                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $frameParams['caption'] . "</div></div></div>";
 635                 return str_replace( "\n", ' ', $s );
 636         }
 637
 638         /**
 639          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 640          * applicable.
 641          *
 642          * @param File $file
 643          * @param MediaTransformOutput $thumb
 644          * @param array $hp Image parameters
 645          */
 646         public static function processResponsiveImages( $file, $thumb, $hp ) {
 647                 global $wgResponsiveImages;
 648                 if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
 649                         $hp15 = $hp;
 650                         $hp15['width'] = round( $hp['width'] * 1.5 );
 651                         $hp20 = $hp;
 652                         $hp20['width'] = $hp['width'] * 2;
 653                         if ( isset( $hp['height'] ) ) {
 654                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 655                                 $hp20['height'] = $hp['height'] * 2;
 656                         }
 657
 658                         $thumb15 = $file->transform( $hp15 );
 659                         $thumb20 = $file->transform( $hp20 );
 660                         if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
 661                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 662                         }
 663                         if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
 664                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 665                         }
 666                 }
 667         }
 668
 669         /**
 670          * Make a "broken" link to an image
 671          *
 672          * @since 1.16.3
 673          * @param LinkTarget $title
 674          * @param string $label Link label (plain text)
 675          * @param string $query Query string
 676          * @param string $unused1 Unused parameter kept for b/c
 677          * @param string $unused2 Unused parameter kept for b/c
 678          * @param bool $time A file of a certain timestamp was requested
 679          * @return string
 680          */
 681         public static function makeBrokenImageLinkObj( $title, $label = '',
 682                 $query = '', $unused1 = '', $unused2 = '', $time = false
 683         ) {
 684                 if ( !$title instanceof LinkTarget ) {
 685                         wfWarn( __METHOD__ . ': Requires $title to be a LinkTarget object.' );
 686                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 687                 }
 688
 689                 $title = Title::castFromLinkTarget( $title );
 690
 691                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 692                 if ( $label == '' ) {
 693                         $label = $title->getPrefixedText();
 694                 }
 695                 $encLabel = htmlspecialchars( $label );
 696                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 697
 698                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 699                         && !$currentExists
 700                 ) {
 701                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 702
 703                         if ( $redir ) {
 704                                 // We already know it's a redirect, so mark it
 705                                 // accordingly
 706                                 return self::link(
 707                                         $title,
 708                                         $encLabel,
 709                                         [ 'class' => 'mw-redirect' ],
 710                                         wfCgiToArray( $query ),
 711                                         [ 'known', 'noclasses' ]
 712                                 );
 713                         }
 714
 715                         $href = self::getUploadUrl( $title, $query );
 716
 717                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 718                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 719                                 $encLabel . '</a>';
 720                 }
 721
 722                 return self::link( $title, $encLabel, [], wfCgiToArray( $query ), [ 'known', 'noclasses' ] );
 723         }
 724
 725         /**
 726          * Get the URL to upload a certain file
 727          *
 728          * @since 1.16.3
 729          * @param LinkTarget $destFile LinkTarget object of the file to upload
 730          * @param string $query Urlencoded query string to prepend
 731          * @return string Urlencoded URL
 732          */
 733         protected static function getUploadUrl( $destFile, $query = '' ) {
 734                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 735                 $q = 'wpDestFile=' . Title::castFromLinkTarget( $destFile )->getPartialURL();
 736                 if ( $query != '' ) {
 737                         $q .= '&' . $query;
 738                 }
 739
 740                 if ( $wgUploadMissingFileUrl ) {
 741                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 742                 }
 743
 744                 if ( $wgUploadNavigationUrl ) {
 745                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 746                 }
 747
 748                 $upload = SpecialPage::getTitleFor( 'Upload' );
 749
 750                 return $upload->getLocalURL( $q );
 751         }
 752
 753         /**
 754          * Create a direct link to a given uploaded file.
 755          *
 756          * @since 1.16.3
 757          * @param LinkTarget $title
 758          * @param string $html Pre-sanitized HTML
 759          * @param string $time MW timestamp of file creation time
 760          * @return string HTML
 761          */
 762         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 763                 $img = wfFindFile( $title, [ 'time' => $time ] );
 764                 return self::makeMediaLinkFile( $title, $img, $html );
 765         }
 766
 767         /**
 768          * Create a direct link to a given uploaded file.
 769          * This will make a broken link if $file is false.
 770          *
 771          * @since 1.16.3
 772          * @param LinkTarget $title
 773          * @param File|bool $file File object or false
 774          * @param string $html Pre-sanitized HTML
 775          * @return string HTML
 776          *
 777          * @todo Handle invalid or missing images better.
 778          */
 779         public static function makeMediaLinkFile( LinkTarget $title, $file, $html = '' ) {
 780                 if ( $file && $file->exists() ) {
 781                         $url = $file->getUrl();
 782                         $class = 'internal';
 783                 } else {
 784                         $url = self::getUploadUrl( $title );
 785                         $class = 'new';
 786                 }
 787
 788                 $alt = $title->getText();
 789                 if ( $html == '' ) {
 790                         $html = $alt;
 791                 }
 792
 793                 $ret = '';
 794                 $attribs = [
 795                         'href' => $url,
 796                         'class' => $class,
 797                         'title' => $alt
 798                 ];
 799
 800                 if ( !Hooks::run( 'LinkerMakeMediaLinkFile',
 801                         [ Title::castFromLinkTarget( $title ), $file, &$html, &$attribs, &$ret ] ) ) {
 802                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
 803                                 . "with url {$url} and text {$html} to {$ret}\n", true );
 804                         return $ret;
 805                 }
 806
 807                 return Html::rawElement( 'a', $attribs, $html );
 808         }
 809
 810         /**
 811          * Make a link to a special page given its name and, optionally,
 812          * a message key from the link text.
 813          * Usage example: Linker::specialLink( 'Recentchanges' )
 814          *
 815          * @since 1.16.3
 816          * @param string $name
 817          * @param string $key
 818          * @return string
 819          */
 820         public static function specialLink( $name, $key = '' ) {
 821                 if ( $key == '' ) {
 822                         $key = strtolower( $name );
 823                 }
 824
 825                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->escaped() );
 826         }
 827
 828         /**
 829          * Make an external link
 830          *
 831          * @since 1.16.3. $title added in 1.21
 832          * @param string $url URL to link to
 833          * @param-taint $url escapes_html
 834          * @param string $text Text of link
 835          * @param-taint $text escapes_html
 836          * @param bool $escape Do we escape the link text?
 837          * @param-taint $escape none
 838          * @param string $linktype Type of external link. Gets added to the classes
 839          * @param-taint $linktype escapes_html
 840          * @param array $attribs Array of extra attributes to <a>
 841          * @param-taint $attribs escapes_html
 842          * @param LinkTarget|null $title LinkTarget object used for title specific link attributes
 843          * @param-taint $title none
 844          * @return string
 845          */
 846         public static function makeExternalLink( $url, $text, $escape = true,
 847                 $linktype = '', $attribs = [], $title = null
 848         ) {
 849                 global $wgTitle;
 850                 $class = "external";
 851                 if ( $linktype ) {
 852                         $class .= " $linktype";
 853                 }
 854                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
 855                         $class .= " {$attribs['class']}";
 856                 }
 857                 $attribs['class'] = $class;
 858
 859                 if ( $escape ) {
 860                         $text = htmlspecialchars( $text );
 861                 }
 862
 863                 if ( !$title ) {
 864                         $title = $wgTitle;
 865                 }
 866                 $newRel = Parser::getExternalLinkRel( $url, $title );
 867                 if ( !isset( $attribs['rel'] ) || $attribs['rel'] === '' ) {
 868                         $attribs['rel'] = $newRel;
 869                 } elseif ( $newRel !== '' ) {
 870                         // Merge the rel attributes.
 871                         $newRels = explode( ' ', $newRel );
 872                         $oldRels = explode( ' ', $attribs['rel'] );
 873                         $combined = array_unique( array_merge( $newRels, $oldRels ) );
 874                         $attribs['rel'] = implode( ' ', $combined );
 875                 }
 876                 $link = '';
 877                 $success = Hooks::run( 'LinkerMakeExternalLink',
 878                         [ &$url, &$text, &$link, &$attribs, $linktype ] );
 879                 if ( !$success ) {
 880                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
 881                                 . "with url {$url} and text {$text} to {$link}\n", true );
 882                         return $link;
 883                 }
 884                 $attribs['href'] = $url;
 885                 return Html::rawElement( 'a', $attribs, $text );
 886         }
 887
 888         /**
 889          * Make user link (or user contributions for unregistered users)
 890          * @param int $userId User id in database.
 891          * @param string $userName User name in database.
 892          * @param string $altUserName Text to display instead of the user name (optional)
 893          * @return string HTML fragment
 894          * @since 1.16.3. $altUserName was added in 1.19.
 895          */
 896         public static function userLink( $userId, $userName, $altUserName = false ) {
 897                 if ( $userName === '' ) {
 898                         wfLogWarning( __METHOD__ . ' received an empty username. Are there database errors ' .
 899                                 'that need to be fixed?' );
 900                         return wfMessage( 'empty-username' )->parse();
 901                 }
 902
 903                 $classes = 'mw-userlink';
 904                 $page = null;
 905                 if ( $userId == 0 ) {
 906                         $page = ExternalUserNames::getUserLinkTitle( $userName );
 907
 908                         if ( ExternalUserNames::isExternal( $userName ) ) {
 909                                 $classes .= ' mw-extuserlink';
 910                         } elseif ( $altUserName === false ) {
 911                                 $altUserName = IP::prettifyIP( $userName );
 912                         }
 913                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (T45179)
 914                 } else {
 915                         $page = new TitleValue( NS_USER, strtr( $userName, ' ', '_' ) );
 916                 }
 917
 918                 // Wrap the output with <bdi> tags for directionality isolation
 919                 $linkText =
 920                         '<bdi>' . htmlspecialchars( $altUserName !== false ? $altUserName : $userName ) . '</bdi>';
 921
 922                 return $page
 923                         ? self::link( $page, $linkText, [ 'class' => $classes ] )
 924                         : Html::rawElement( 'span', [ 'class' => $classes ], $linkText );
 925         }
 926
 927         /**
 928          * Generate standard user tool links (talk, contributions, block link, etc.)
 929          *
 930          * @since 1.16.3
 931          * @param int $userId User identifier
 932          * @param string $userText User name or IP address
 933          * @param bool $redContribsWhenNoEdits Should the contributions link be
 934          *   red if the user has no edits?
 935          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
 936          *   and Linker::TOOL_LINKS_EMAIL).
 937          * @param int|null $edits User edit count (optional, for performance)
 938          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
 939          * @return string HTML fragment
 940          */
 941         public static function userToolLinks(
 942                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null,
 943                 $useParentheses = true
 944         ) {
 945                 if ( $userText === '' ) {
 946                         wfLogWarning( __METHOD__ . ' received an empty username. Are there database errors ' .
 947                                 'that need to be fixed?' );
 948                         return ' ' . wfMessage( 'empty-username' )->parse();
 949                 }
 950
 951                 global $wgUser, $wgDisableAnonTalk, $wgLang;
 952                 $talkable = !( $wgDisableAnonTalk && $userId == 0 );
 953                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
 954                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
 955
 956                 if ( $userId == 0 && ExternalUserNames::isExternal( $userText ) ) {
 957                         // No tools for an external user
 958                         return '';
 959                 }
 960
 961                 $items = [];
 962                 if ( $talkable ) {
 963                         $items[] = self::userTalkLink( $userId, $userText );
 964                 }
 965                 if ( $userId ) {
 966                         // check if the user has an edit
 967                         $attribs = [];
 968                         $attribs['class'] = 'mw-usertoollinks-contribs';
 969                         if ( $redContribsWhenNoEdits ) {
 970                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
 971                                         $user = User::newFromId( $userId );
 972                                         $edits = $user->getEditCount();
 973                                 }
 974                                 if ( $edits === 0 ) {
 975                                         $attribs['class'] .= ' new';
 976                                 }
 977                         }
 978                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
 979
 980                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
 981                 }
 982                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
 983                         $items[] = self::blockLink( $userId, $userText );
 984                 }
 985
 986                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
 987                         $items[] = self::emailLink( $userId, $userText );
 988                 }
 989
 990                 Hooks::run( 'UserToolLinksEdit', [ $userId, $userText, &$items ] );
 991
 992                 if ( !$items ) {
 993                         return '';
 994                 }
 995
 996                 if ( $useParentheses ) {
 997                         return wfMessage( 'word-separator' )->escaped()
 998                                 . '<span class="mw-usertoollinks">'
 999                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1000                                 . '</span>';
1001                 }
1002
1003                 $tools = [];
1004                 foreach ( $items as $tool ) {
1005                         $tools[] = Html::rawElement( 'span', [], $tool );
1006                 }
1007                 return ' <span class="mw-usertoollinks mw-changeslist-links">' .
1008                         implode( ' ', $tools ) . '</span>';
1009         }
1010
1011         /**
1012          * Alias for userToolLinks( $userId, $userText, true );
1013          * @since 1.16.3
1014          * @param int $userId User identifier
1015          * @param string $userText User name or IP address
1016          * @param int|null $edits User edit count (optional, for performance)
1017          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
1018          * @return string
1019          */
1020         public static function userToolLinksRedContribs(
1021                 $userId, $userText, $edits = null, $useParentheses = true
1022         ) {
1023                 return self::userToolLinks( $userId, $userText, true, 0, $edits, $useParentheses );
1024         }
1025
1026         /**
1027          * @since 1.16.3
1028          * @param int $userId User id in database.
1029          * @param string $userText User name in database.
1030          * @return string HTML fragment with user talk link
1031          */
1032         public static function userTalkLink( $userId, $userText ) {
1033                 if ( $userText === '' ) {
1034                         wfLogWarning( __METHOD__ . ' received an empty username. Are there database errors ' .
1035                                 'that need to be fixed?' );
1036                         return wfMessage( 'empty-username' )->parse();
1037                 }
1038
1039                 $userTalkPage = new TitleValue( NS_USER_TALK, strtr( $userText, ' ', '_' ) );
1040                 $moreLinkAttribs['class'] = 'mw-usertoollinks-talk';
1041
1042                 return self::link( $userTalkPage,
1043                         wfMessage( 'talkpagelinktext' )->escaped(),
1044                         $moreLinkAttribs
1045                 );
1046         }
1047
1048         /**
1049          * @since 1.16.3
1050          * @param int $userId
1051          * @param string $userText User name in database.
1052          * @return string HTML fragment with block link
1053          */
1054         public static function blockLink( $userId, $userText ) {
1055                 if ( $userText === '' ) {
1056                         wfLogWarning( __METHOD__ . ' received an empty username. Are there database errors ' .
1057                                 'that need to be fixed?' );
1058                         return wfMessage( 'empty-username' )->parse();
1059                 }
1060
1061                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1062                 $moreLinkAttribs['class'] = 'mw-usertoollinks-block';
1063
1064                 return self::link( $blockPage,
1065                         wfMessage( 'blocklink' )->escaped(),
1066                         $moreLinkAttribs
1067                 );
1068         }
1069
1070         /**
1071          * @param int $userId
1072          * @param string $userText User name in database.
1073          * @return string HTML fragment with e-mail user link
1074          */
1075         public static function emailLink( $userId, $userText ) {
1076                 if ( $userText === '' ) {
1077                         wfLogWarning( __METHOD__ . ' received an empty username. Are there database errors ' .
1078                                 'that need to be fixed?' );
1079                         return wfMessage( 'empty-username' )->parse();
1080                 }
1081
1082                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1083                 $moreLinkAttribs['class'] = 'mw-usertoollinks-mail';
1084                 return self::link( $emailPage,
1085                         wfMessage( 'emaillink' )->escaped(),
1086                         $moreLinkAttribs
1087                 );
1088         }
1089
1090         /**
1091          * Generate a user link if the current user is allowed to view it
1092          * @since 1.16.3
1093          * @param Revision $rev
1094          * @param bool $isPublic Show only if all users can see it
1095          * @return string HTML fragment
1096          */
1097         public static function revUserLink( $rev, $isPublic = false ) {
1098                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1099                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1100                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1101                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1102                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1103                 } else {
1104                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1105                 }
1106                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1107                         return '<span class="history-deleted">' . $link . '</span>';
1108                 }
1109                 return $link;
1110         }
1111
1112         /**
1113          * Generate a user tool link cluster if the current user is allowed to view it
1114          * @since 1.16.3
1115          * @param Revision $rev
1116          * @param bool $isPublic Show only if all users can see it
1117          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
1118          * @return string HTML
1119          */
1120         public static function revUserTools( $rev, $isPublic = false, $useParentheses = true ) {
1121                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1122                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1123                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1124                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1125                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1126                         $link = self::userLink( $userId, $userText )
1127                                 . self::userToolLinks( $userId, $userText, false, 0, null,
1128                                         $useParentheses );
1129                 } else {
1130                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1131                 }
1132                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1133                         return ' <span class="history-deleted mw-userlink">' . $link . '</span>';
1134                 }
1135                 return $link;
1136         }
1137
1138         /**
1139          * This function is called by all recent changes variants, by the page history,
1140          * and by the user contributions list. It is responsible for formatting edit
1141          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1142          * auto-generated comments (from section editing) and formats [[wikilinks]].
1143          *
1144          * @author Erik Moeller <moeller@scireview.de>
1145          * @since 1.16.3. $wikiId added in 1.26
1146          *
1147          * @param string $comment
1148          * @param LinkTarget|null $title LinkTarget object (to generate link to the section in
1149          *  autocomment) or null
1150          * @param bool $local Whether section links should refer to local page
1151          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1152          *  For use with external changes.
1153          *
1154          * @return string HTML
1155          */
1156         public static function formatComment(
1157                 $comment, $title = null, $local = false, $wikiId = null
1158         ) {
1159                 # Sanitize text a bit:
1160                 $comment = str_replace( "\n", " ", $comment );
1161                 # Allow HTML entities (for T15815)
1162                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1163
1164                 # Render autocomments and make links:
1165                 $comment = self::formatAutocomments( $comment, $title, $local, $wikiId );
1166                 return self::formatLinksInComment( $comment, $title, $local, $wikiId );
1167         }
1168
1169         /**
1170          * Converts autogenerated comments in edit summaries into section links.
1171          *
1172          * The pattern for autogen comments is / * foo * /, which makes for
1173          * some nasty regex.
1174          * We look for all comments, match any text before and after the comment,
1175          * add a separator where needed and format the comment itself with CSS
1176          * Called by Linker::formatComment.
1177          *
1178          * @param string $comment Comment text
1179          * @param LinkTarget|null $title An optional LinkTarget object used to links to sections
1180          * @param bool $local Whether section links should refer to local page
1181          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1182          *  as used by WikiMap.
1183          *
1184          * @return string Formatted comment (wikitext)
1185          */
1186         private static function formatAutocomments(
1187                 $comment, $title = null, $local = false, $wikiId = null
1188         ) {
1189                 // @todo $append here is something of a hack to preserve the status
1190                 // quo. Someone who knows more about bidi and such should decide
1191                 // (1) what sane rendering even *is* for an LTR edit summary on an RTL
1192                 // wiki, both when autocomments exist and when they don't, and
1193                 // (2) what markup will make that actually happen.
1194                 $append = '';
1195                 $comment = preg_replace_callback(
1196                         // To detect the presence of content before or after the
1197                         // auto-comment, we use capturing groups inside optional zero-width
1198                         // assertions. But older versions of PCRE can't directly make
1199                         // zero-width assertions optional, so wrap them in a non-capturing
1200                         // group.
1201                         '!(?:(?<=(.)))?/\*\s*(.*?)\s*\*/(?:(?=(.)))?!',
1202                         function ( $match ) use ( $title, $local, $wikiId, &$append ) {
1203                                 global $wgLang;
1204
1205                                 // Ensure all match positions are defined
1206                                 $match += [ '', '', '', '' ];
1207
1208                                 $pre = $match[1] !== '';
1209                                 $auto = $match[2];
1210                                 $post = $match[3] !== '';
1211                                 $comment = null;
1212
1213                                 Hooks::run(
1214                                         'FormatAutocomments',
1215                                         [ &$comment, $pre, $auto, $post, Title::castFromLinkTarget( $title ), $local,
1216                                         $wikiId ]
1217                                 );
1218
1219                                 if ( $comment === null ) {
1220                                         if ( $title ) {
1221                                                 $section = $auto;
1222                                                 # Remove links that a user may have manually put in the autosummary
1223                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1224                                                 $section = str_replace( [
1225                                                         '[[:',
1226                                                         '[[',
1227                                                         ']]'
1228                                                 ], '', $section );
1229
1230                                                 // We don't want any links in the auto text to be linked, but we still
1231                                                 // want to show any [[ ]]
1232                                                 $sectionText = str_replace( '[[', '&#91;[', $auto );
1233
1234                                                 $section = substr( Parser::guessSectionNameFromStrippedText( $section ), 1 );
1235                                                 if ( $local ) {
1236                                                         $sectionTitle = new TitleValue( NS_MAIN, '', $section );
1237                                                 } else {
1238                                                         $sectionTitle = $title->createFragmentTarget( $section );
1239                                                 }
1240                                                 if ( $sectionTitle ) {
1241                                                         $auto = Linker::makeCommentLink(
1242                                                                 $sectionTitle, $wgLang->getArrow() . $wgLang->getDirMark() . $sectionText,
1243                                                                 $wikiId, 'noclasses'
1244                                                         );
1245                                                 }
1246                                         }
1247                                         if ( $pre ) {
1248                                                 # written summary $presep autocomment (summary /* section */)
1249                                                 $pre = wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1250                                         }
1251                                         if ( $post ) {
1252                                                 # autocomment $postsep written summary (/* section */ summary)
1253                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1254                                         }
1255                                         if ( $auto ) {
1256                                                 $auto = '<span dir="auto"><span class="autocomment">' . $auto . '</span>';
1257                                                 $append .= '</span>';
1258                                         }
1259                                         $comment = $pre . $auto;
1260                                 }
1261                                 return $comment;
1262                         },
1263                         $comment
1264                 );
1265                 return $comment . $append;
1266         }
1267
1268         /**
1269          * Formats wiki links and media links in text; all other wiki formatting
1270          * is ignored
1271          *
1272          * @since 1.16.3. $wikiId added in 1.26
1273          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1274          *
1275          * @param string $comment Text to format links in. WARNING! Since the output of this
1276          *      function is html, $comment must be sanitized for use as html. You probably want
1277          *      to pass $comment through Sanitizer::escapeHtmlAllowEntities() before calling
1278          *      this function.
1279          * @param LinkTarget|null $title An optional LinkTarget object used to links to sections
1280          * @param bool $local Whether section links should refer to local page
1281          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1282          *  as used by WikiMap.
1283          *
1284          * @return string HTML
1285          * @return-taint onlysafefor_html
1286          */
1287         public static function formatLinksInComment(
1288                 $comment, $title = null, $local = false, $wikiId = null
1289         ) {
1290                 return preg_replace_callback(
1291                         '/
1292                                 \[\[
1293                                 \s*+ # ignore leading whitespace, the *+ quantifier disallows backtracking
1294                                 :? # ignore optional leading colon
1295                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1296                                 (?:\|
1297                                         # 2. link text
1298                                         # Stop matching at ]] without relying on backtracking.
1299                                         ((?:]?[^\]])*+)
1300                                 )?
1301                                 \]\]
1302                                 ([^[]*) # 3. link trail (the text up until the next link)
1303                         /x',
1304                         function ( $match ) use ( $title, $local, $wikiId ) {
1305                                 $services = MediaWikiServices::getInstance();
1306
1307                                 $medians = '(?:';
1308                                 $medians .= preg_quote(
1309                                         $services->getNamespaceInfo()->getCanonicalName( NS_MEDIA ), '/' );
1310                                 $medians .= '|';
1311                                 $medians .= preg_quote(
1312                                         MediaWikiServices::getInstance()->getContentLanguage()->getNsText( NS_MEDIA ),
1313                                         '/'
1314                                 ) . '):';
1315
1316                                 $comment = $match[0];
1317
1318                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1319                                 if ( strpos( $match[1], '%' ) !== false ) {
1320                                         $match[1] = strtr(
1321                                                 rawurldecode( $match[1] ),
1322                                                 [ '<' => '&lt;', '>' => '&gt;' ]
1323                                         );
1324                                 }
1325
1326                                 # Handle link renaming [[foo|text]] will show link as "text"
1327                                 if ( $match[2] != "" ) {
1328                                         $text = $match[2];
1329                                 } else {
1330                                         $text = $match[1];
1331                                 }
1332                                 $submatch = [];
1333                                 $thelink = null;
1334                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1335                                         # Media link; trail not supported.
1336                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1337                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1338                                         if ( $title ) {
1339                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1340                                         }
1341                                 } else {
1342                                         # Other kind of link
1343                                         # Make sure its target is non-empty
1344                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1345                                                 $match[1] = substr( $match[1], 1 );
1346                                         }
1347                                         if ( $match[1] !== false && $match[1] !== '' ) {
1348                                                 if ( preg_match(
1349                                                         MediaWikiServices::getInstance()->getContentLanguage()->linkTrail(),
1350                                                         $match[3],
1351                                                         $submatch
1352                                                 ) ) {
1353                                                         $trail = $submatch[1];
1354                                                 } else {
1355                                                         $trail = "";
1356                                                 }
1357                                                 $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1358                                                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1359
1360                                                 $linkText = $text;
1361                                                 $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1362
1363                                                 Title::newFromText( $linkTarget );
1364                                                 try {
1365                                                         $target = MediaWikiServices::getInstance()->getTitleParser()->
1366                                                                 parseTitle( $linkTarget );
1367
1368                                                         if ( $target->getText() == '' && !$target->isExternal()
1369                                                                 && !$local && $title
1370                                                         ) {
1371                                                                 $target = $title->createFragmentTarget( $target->getFragment() );
1372                                                         }
1373
1374                                                         $thelink = Linker::makeCommentLink( $target, $linkText . $inside, $wikiId ) . $trail;
1375                                                 } catch ( MalformedTitleException $e ) {
1376                                                         // Fall through
1377                                                 }
1378                                         }
1379                                 }
1380                                 if ( $thelink ) {
1381                                         // If the link is still valid, go ahead and replace it in!
1382                                         $comment = preg_replace(
1383                                                 $linkRegexp,
1384                                                 StringUtils::escapeRegexReplacement( $thelink ),
1385                                                 $comment,
1386                                                 1
1387                                         );
1388                                 }
1389
1390                                 return $comment;
1391                         },
1392                         $comment
1393                 );
1394         }
1395
1396         /**
1397          * Generates a link to the given LinkTarget
1398          *
1399          * @note This is only public for technical reasons. It's not intended for use outside Linker.
1400          *
1401          * @param LinkTarget $linkTarget
1402          * @param string $text
1403          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1404          *  as used by WikiMap.
1405          * @param string|string[] $options See the $options parameter in Linker::link.
1406          *
1407          * @return string HTML link
1408          */
1409         public static function makeCommentLink(
1410                 LinkTarget $linkTarget, $text, $wikiId = null, $options = []
1411         ) {
1412                 if ( $wikiId !== null && !$linkTarget->isExternal() ) {
1413                         $link = self::makeExternalLink(
1414                                 WikiMap::getForeignURL(
1415                                         $wikiId,
1416                                         $linkTarget->getNamespace() === 0
1417                                                 ? $linkTarget->getDBkey()
1418                                                 : MediaWikiServices::getInstance()->getNamespaceInfo()->
1419                                                         getCanonicalName( $linkTarget->getNamespace() ) .
1420                                                         ':' . $linkTarget->getDBkey(),
1421                                         $linkTarget->getFragment()
1422                                 ),
1423                                 $text,
1424                                 /* escape = */ false // Already escaped
1425                         );
1426                 } else {
1427                         $link = self::link( $linkTarget, $text, [], [], $options );
1428                 }
1429
1430                 return $link;
1431         }
1432
1433         /**
1434          * @param LinkTarget $contextTitle
1435          * @param string $target
1436          * @param string &$text
1437          * @return string
1438          */
1439         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1440                 # Valid link forms:
1441                 # Foobar -- normal
1442                 # :Foobar -- override special treatment of prefix (images, language links)
1443                 # /Foobar -- convert to CurrentPage/Foobar
1444                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial and final / from text
1445                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1446                 # ../Foobar -- convert to CurrentPage/Foobar,
1447                 #              (from CurrentPage/CurrentSubPage)
1448                 # ../Foobar/ -- convert to CurrentPage/Foobar, use 'Foobar' as text
1449                 #              (from CurrentPage/CurrentSubPage)
1450
1451                 $ret = $target; # default return value is no change
1452
1453                 # Some namespaces don't allow subpages,
1454                 # so only perform processing if subpages are allowed
1455                 if (
1456                         $contextTitle && MediaWikiServices::getInstance()->getNamespaceInfo()->
1457                         hasSubpages( $contextTitle->getNamespace() )
1458                 ) {
1459                         $hash = strpos( $target, '#' );
1460                         if ( $hash !== false ) {
1461                                 $suffix = substr( $target, $hash );
1462                                 $target = substr( $target, 0, $hash );
1463                         } else {
1464                                 $suffix = '';
1465                         }
1466                         # T9425
1467                         $target = trim( $target );
1468                         $contextPrefixedText = MediaWikiServices::getInstance()->getTitleFormatter()->
1469                                 getPrefixedText( $contextTitle );
1470                         # Look at the first character
1471                         if ( $target != '' && $target[0] === '/' ) {
1472                                 # / at end means we don't want the slash to be shown
1473                                 $m = [];
1474                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1475                                 if ( $trailingSlashes ) {
1476                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1477                                 } else {
1478                                         $noslash = substr( $target, 1 );
1479                                 }
1480
1481                                 $ret = $contextPrefixedText . '/' . trim( $noslash ) . $suffix;
1482                                 if ( $text === '' ) {
1483                                         $text = $target . $suffix;
1484                                 } # this might be changed for ugliness reasons
1485                         } else {
1486                                 # check for .. subpage backlinks
1487                                 $dotdotcount = 0;
1488                                 $nodotdot = $target;
1489                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1490                                         ++$dotdotcount;
1491                                         $nodotdot = substr( $nodotdot, 3 );
1492                                 }
1493                                 if ( $dotdotcount > 0 ) {
1494                                         $exploded = explode( '/', $contextPrefixedText );
1495                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1496                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1497                                                 # / at the end means don't show full path
1498                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1499                                                         $nodotdot = rtrim( $nodotdot, '/' );
1500                                                         if ( $text === '' ) {
1501                                                                 $text = $nodotdot . $suffix;
1502                                                         }
1503                                                 }
1504                                                 $nodotdot = trim( $nodotdot );
1505                                                 if ( $nodotdot != '' ) {
1506                                                         $ret .= '/' . $nodotdot;
1507                                                 }
1508                                                 $ret .= $suffix;
1509                                         }
1510                                 }
1511                         }
1512                 }
1513
1514                 return $ret;
1515         }
1516
1517         /**
1518          * Wrap a comment in standard punctuation and formatting if
1519          * it's non-empty, otherwise return empty string.
1520          *
1521          * @since 1.16.3. $wikiId added in 1.26
1522          * @param string $comment
1523          * @param LinkTarget|null $title LinkTarget object (to generate link to section in autocomment)
1524          *  or null
1525          * @param bool $local Whether section links should refer to local page
1526          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1527          *  For use with external changes.
1528          *
1529          * @return string
1530          */
1531         public static function commentBlock(
1532                 $comment, $title = null, $local = false, $wikiId = null, $useParentheses = true
1533         ) {
1534                 // '*' used to be the comment inserted by the software way back
1535                 // in antiquity in case none was provided, here for backwards
1536                 // compatibility, acc. to brion -ævar
1537                 if ( $comment == '' || $comment == '*' ) {
1538                         return '';
1539                 }
1540                 $formatted = self::formatComment( $comment, $title, $local, $wikiId );
1541                 if ( $useParentheses ) {
1542                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1543                         $classNames = 'comment';
1544                 } else {
1545                         $classNames = 'comment comment--without-parentheses';
1546                 }
1547                 return " <span class=\"$classNames\">$formatted</span>";
1548         }
1549
1550         /**
1551          * Wrap and format the given revision's comment block, if the current
1552          * user is allowed to view it.
1553          *
1554          * @since 1.16.3
1555          * @param Revision $rev
1556          * @param bool $local Whether section links should refer to local page
1557          * @param bool $isPublic Show only if all users can see it
1558          * @param bool $useParentheses (optional) Wrap comments in parentheses where needed
1559          * @return string HTML fragment
1560          */
1561         public static function revComment( Revision $rev, $local = false, $isPublic = false,
1562                 $useParentheses = true
1563         ) {
1564                 if ( $rev->getComment( Revision::RAW ) == "" ) {
1565                         return "";
1566                 }
1567                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1568                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1569                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1570                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1571                                 $rev->getTitle(), $local, null, $useParentheses );
1572                 } else {
1573                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1574                 }
1575                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1576                         return " <span class=\"history-deleted comment\">$block</span>";
1577                 }
1578                 return $block;
1579         }
1580
1581         /**
1582          * @since 1.16.3
1583          * @param int $size
1584          * @return string
1585          */
1586         public static function formatRevisionSize( $size ) {
1587                 if ( $size == 0 ) {
1588                         $stxt = wfMessage( 'historyempty' )->escaped();
1589                 } else {
1590                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1591                 }
1592                 return "<span class=\"history-size mw-diff-bytes\">$stxt</span>";
1593         }
1594
1595         /**
1596          * Add another level to the Table of Contents
1597          *
1598          * @since 1.16.3
1599          * @return string
1600          */
1601         public static function tocIndent() {
1602                 return "\n<ul>\n";
1603         }
1604
1605         /**
1606          * Finish one or more sublevels on the Table of Contents
1607          *
1608          * @since 1.16.3
1609          * @param int $level
1610          * @return string
1611          */
1612         public static function tocUnindent( $level ) {
1613                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1614         }
1615
1616         /**
1617          * parameter level defines if we are on an indentation level
1618          *
1619          * @since 1.16.3
1620          * @param string $anchor
1621          * @param string $tocline
1622          * @param string $tocnumber
1623          * @param string $level
1624          * @param string|bool $sectionIndex
1625          * @return string
1626          */
1627         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1628                 $classes = "toclevel-$level";
1629                 if ( $sectionIndex !== false ) {
1630                         $classes .= " tocsection-$sectionIndex";
1631                 }
1632
1633                 // <li class="$classes"><a href="#$anchor"><span class="tocnumber">
1634                 // $tocnumber</span> <span class="toctext">$tocline</span></a>
1635                 return Html::openElement( 'li', [ 'class' => $classes ] )
1636                         . Html::rawElement( 'a',
1637                                 [ 'href' => "#$anchor" ],
1638                                 Html::element( 'span', [ 'class' => 'tocnumber' ], $tocnumber )
1639                                         . ' '
1640                                         . Html::rawElement( 'span', [ 'class' => 'toctext' ], $tocline )
1641                         );
1642         }
1643
1644         /**
1645          * End a Table Of Contents line.
1646          * tocUnindent() will be used instead if we're ending a line below
1647          * the new level.
1648          * @since 1.16.3
1649          * @return string
1650          */
1651         public static function tocLineEnd() {
1652                 return "</li>\n";
1653         }
1654
1655         /**
1656          * Wraps the TOC in a table and provides the hide/collapse javascript.
1657          *
1658          * @since 1.16.3
1659          * @param string $toc Html of the Table Of Contents
1660          * @param string|Language|bool|null $lang Language for the toc title, defaults to user language.
1661          *  The types string and bool are deprecated.
1662          * @return string Full html of the TOC
1663          */
1664         public static function tocList( $toc, $lang = null ) {
1665                 $lang = $lang ?? RequestContext::getMain()->getLanguage();
1666                 if ( !$lang instanceof Language ) {
1667                         wfDeprecated( __METHOD__ . ' with type other than Language for $lang', '1.33' );
1668                         $lang = wfGetLangObj( $lang );
1669                 }
1670
1671                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1672
1673                 return '<div id="toc" class="toc">'
1674                         . Html::element( 'input', [
1675                                 'type' => 'checkbox',
1676                                 'role' => 'button',
1677                                 'id' => 'toctogglecheckbox',
1678                                 'class' => 'toctogglecheckbox',
1679                                 'style' => 'display:none',
1680                         ] )
1681                         . Html::openElement( 'div', [
1682                                 'class' => 'toctitle',
1683                                 'lang' => $lang->getHtmlCode(),
1684                                 'dir' => $lang->getDir(),
1685                         ] )
1686                         . "<h2>$title</h2>"
1687                         . '<span class="toctogglespan">'
1688                         . Html::label( '', 'toctogglecheckbox', [
1689                                 'class' => 'toctogglelabel',
1690                         ] )
1691                         . '</span>'
1692                         . "</div>\n"
1693                         . $toc
1694                         . "</ul>\n</div>\n";
1695         }
1696
1697         /**
1698          * Generate a table of contents from a section tree.
1699          *
1700          * @since 1.16.3. $lang added in 1.17
1701          * @param array $tree Return value of ParserOutput::getSections()
1702          * @param string|Language|bool|null $lang Language for the toc title, defaults to user language.
1703          *  The types string and bool are deprecated.
1704          * @return string HTML fragment
1705          */
1706         public static function generateTOC( $tree, $lang = null ) {
1707                 $toc = '';
1708                 $lastLevel = 0;
1709                 foreach ( $tree as $section ) {
1710                         if ( $section['toclevel'] > $lastLevel ) {
1711                                 $toc .= self::tocIndent();
1712                         } elseif ( $section['toclevel'] < $lastLevel ) {
1713                                 $toc .= self::tocUnindent(
1714                                         $lastLevel - $section['toclevel'] );
1715                         } else {
1716                                 $toc .= self::tocLineEnd();
1717                         }
1718
1719                         $toc .= self::tocLine( $section['anchor'],
1720                                 $section['line'], $section['number'],
1721                                 $section['toclevel'], $section['index'] );
1722                         $lastLevel = $section['toclevel'];
1723                 }
1724                 $toc .= self::tocLineEnd();
1725                 return self::tocList( $toc, $lang );
1726         }
1727
1728         /**
1729          * Create a headline for content
1730          *
1731          * @since 1.16.3
1732          * @param int $level The level of the headline (1-6)
1733          * @param string $attribs Any attributes for the headline, starting with
1734          *   a space and ending with '>'
1735          *   This *must* be at least '>' for no attribs
1736          * @param string $anchor The anchor to give the headline (the bit after the #)
1737          * @param string $html HTML for the text of the header
1738          * @param string $link HTML to add for the section edit link
1739          * @param string|bool $fallbackAnchor A second, optional anchor to give for
1740          *   backward compatibility (false to omit)
1741          *
1742          * @return string HTML headline
1743          */
1744         public static function makeHeadline( $level, $attribs, $anchor, $html,
1745                 $link, $fallbackAnchor = false
1746         ) {
1747                 $anchorEscaped = htmlspecialchars( $anchor );
1748                 $fallback = '';
1749                 if ( $fallbackAnchor !== false && $fallbackAnchor !== $anchor ) {
1750                         $fallbackAnchor = htmlspecialchars( $fallbackAnchor );
1751                         $fallback = "<span id=\"$fallbackAnchor\"></span>";
1752                 }
1753                 return "<h$level$attribs"
1754                         . "$fallback<span class=\"mw-headline\" id=\"$anchorEscaped\">$html</span>"
1755                         . $link
1756                         . "</h$level>";
1757         }
1758
1759         /**
1760          * Split a link trail, return the "inside" portion and the remainder of the trail
1761          * as a two-element array
1762          * @param string $trail
1763          * @return array
1764          */
1765         static function splitTrail( $trail ) {
1766                 $regex = MediaWikiServices::getInstance()->getContentLanguage()->linkTrail();
1767                 $inside = '';
1768                 if ( $trail !== '' && preg_match( $regex, $trail, $m ) ) {
1769                         list( , $inside, $trail ) = $m;
1770                 }
1771                 return [ $inside, $trail ];
1772         }
1773
1774         /**
1775          * Generate a rollback link for a given revision.  Currently it's the
1776          * caller's responsibility to ensure that the revision is the top one. If
1777          * it's not, of course, the user will get an error message.
1778          *
1779          * If the calling page is called with the parameter &bot=1, all rollback
1780          * links also get that parameter. It causes the edit itself and the rollback
1781          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1782          * changes, so this allows sysops to combat a busy vandal without bothering
1783          * other users.
1784          *
1785          * If the option verify is set this function will return the link only in case the
1786          * revision can be reverted. Please note that due to performance limitations
1787          * it might be assumed that a user isn't the only contributor of a page while
1788          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1789          * work if $wgShowRollbackEditCount is disabled, so this can only function
1790          * as an additional check.
1791          *
1792          * If the option noBrackets is set the rollback link wont be enclosed in "[]".
1793          *
1794          * @since 1.16.3. $context added in 1.20. $options added in 1.21
1795          *
1796          * @param Revision $rev
1797          * @param IContextSource|null $context Context to use or null for the main context.
1798          * @param array $options
1799          * @return string
1800          */
1801         public static function generateRollback( $rev, IContextSource $context = null,
1802                 $options = [ 'verify' ]
1803         ) {
1804                 if ( $context === null ) {
1805                         $context = RequestContext::getMain();
1806                 }
1807
1808                 $editCount = false;
1809                 if ( in_array( 'verify', $options, true ) ) {
1810                         $editCount = self::getRollbackEditCount( $rev, true );
1811                         if ( $editCount === false ) {
1812                                 return '';
1813                         }
1814                 }
1815
1816                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1817
1818                 if ( !in_array( 'noBrackets', $options, true ) ) {
1819                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->escaped();
1820                 }
1821
1822                 if ( $context->getUser()->getBoolOption( 'showrollbackconfirmation' ) ) {
1823                         $stats = MediaWikiServices::getInstance()->getStatsdDataFactory();
1824                         $stats->increment( 'rollbackconfirmation.event.load' );
1825                         $context->getOutput()->addModules( 'mediawiki.page.rollback.confirmation' );
1826                 }
1827
1828                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1829         }
1830
1831         /**
1832          * This function will return the number of revisions which a rollback
1833          * would revert and, if $verify is set it will verify that a revision
1834          * can be reverted (that the user isn't the only contributor and the
1835          * revision we might rollback to isn't deleted). These checks can only
1836          * function as an additional check as this function only checks against
1837          * the last $wgShowRollbackEditCount edits.
1838          *
1839          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1840          * is set and the user is the only contributor of the page.
1841          *
1842          * @param Revision $rev
1843          * @param bool $verify Try to verify that this revision can really be rolled back
1844          * @return int|bool|null
1845          */
1846         public static function getRollbackEditCount( $rev, $verify ) {
1847                 global $wgShowRollbackEditCount;
1848                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1849                         // Nothing has happened, indicate this by returning 'null'
1850                         return null;
1851                 }
1852
1853                 $dbr = wfGetDB( DB_REPLICA );
1854
1855                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1856                 $revQuery = Revision::getQueryInfo();
1857                 $res = $dbr->select(
1858                         $revQuery['tables'],
1859                         [ 'rev_user_text' => $revQuery['fields']['rev_user_text'], 'rev_deleted' ],
1860                         // $rev->getPage() returns null sometimes
1861                         [ 'rev_page' => $rev->getTitle()->getArticleID() ],
1862                         __METHOD__,
1863                         [
1864                                 'USE INDEX' => [ 'revision' => 'page_timestamp' ],
1865                                 'ORDER BY' => 'rev_timestamp DESC',
1866                                 'LIMIT' => $wgShowRollbackEditCount + 1
1867                         ],
1868                         $revQuery['joins']
1869                 );
1870
1871                 $editCount = 0;
1872                 $moreRevs = false;
1873                 foreach ( $res as $row ) {
1874                         if ( $rev->getUserText( Revision::RAW ) != $row->rev_user_text ) {
1875                                 if ( $verify &&
1876                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1877                                                 || $row->rev_deleted & Revision::DELETED_USER
1878                                 ) ) {
1879                                         // If the user or the text of the revision we might rollback
1880                                         // to is deleted in some way we can't rollback. Similar to
1881                                         // the sanity checks in WikiPage::commitRollback.
1882                                         return false;
1883                                 }
1884                                 $moreRevs = true;
1885                                 break;
1886                         }
1887                         $editCount++;
1888                 }
1889
1890                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1891                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1892                         // and there weren't any other revisions. That means that the current user is the only
1893                         // editor, so we can't rollback
1894                         return false;
1895                 }
1896                 return $editCount;
1897         }
1898
1899         /**
1900          * Build a raw rollback link, useful for collections of "tool" links
1901          *
1902          * @since 1.16.3. $context added in 1.20. $editCount added in 1.21
1903          * @param Revision $rev
1904          * @param IContextSource|null $context Context to use or null for the main context.
1905          * @param int $editCount Number of edits that would be reverted
1906          * @return string HTML fragment
1907          */
1908         public static function buildRollbackLink( $rev, IContextSource $context = null,
1909                 $editCount = false
1910         ) {
1911                 global $wgShowRollbackEditCount, $wgMiserMode;
1912
1913                 // To config which pages are affected by miser mode
1914                 $disableRollbackEditCountSpecialPage = [ 'Recentchanges', 'Watchlist' ];
1915
1916                 if ( $context === null ) {
1917                         $context = RequestContext::getMain();
1918                 }
1919
1920                 $title = $rev->getTitle();
1921
1922                 $query = [
1923                         'action' => 'rollback',
1924                         'from' => $rev->getUserText(),
1925                         'token' => $context->getUser()->getEditToken( 'rollback' ),
1926                 ];
1927
1928                 $attrs = [
1929                         'data-mw' => 'interface',
1930                         'title' => $context->msg( 'tooltip-rollback' )->text()
1931                 ];
1932
1933                 $options = [ 'known', 'noclasses' ];
1934
1935                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1936                         //T17999
1937                         $query['hidediff'] = '1';
1938                         $query['bot'] = '1';
1939                 }
1940
1941                 $disableRollbackEditCount = false;
1942                 if ( $wgMiserMode ) {
1943                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1944                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1945                                         $disableRollbackEditCount = true;
1946                                         break;
1947                                 }
1948                         }
1949                 }
1950
1951                 if ( !$disableRollbackEditCount
1952                         && is_int( $wgShowRollbackEditCount )
1953                         && $wgShowRollbackEditCount > 0
1954                 ) {
1955                         if ( !is_numeric( $editCount ) ) {
1956                                 $editCount = self::getRollbackEditCount( $rev, false );
1957                         }
1958
1959                         if ( $editCount > $wgShowRollbackEditCount ) {
1960                                 $html = $context->msg( 'rollbacklinkcount-morethan' )
1961                                         ->numParams( $wgShowRollbackEditCount )->parse();
1962                         } else {
1963                                 $html = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1964                         }
1965
1966                         return self::link( $title, $html, $attrs, $query, $options );
1967                 }
1968
1969                 $html = $context->msg( 'rollbacklink' )->escaped();
1970                 return self::link( $title, $html, $attrs, $query, $options );
1971         }
1972
1973         /**
1974          * Returns HTML for the "hidden categories on this page" list.
1975          *
1976          * @since 1.16.3
1977          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
1978          *   or similar
1979          * @return string HTML output
1980          */
1981         public static function formatHiddenCategories( $hiddencats ) {
1982                 $outText = '';
1983                 if ( count( $hiddencats ) > 0 ) {
1984                         # Construct the HTML
1985                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
1986                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
1987                         $outText .= "</div><ul>\n";
1988
1989                         foreach ( $hiddencats as $titleObj ) {
1990                                 # If it's hidden, it must exist - no need to check with a LinkBatch
1991                                 $outText .= '<li>'
1992                                         . self::link( $titleObj, null, [], [], 'known' )
1993                                         . "</li>\n";
1994                         }
1995                         $outText .= '</ul>';
1996                 }
1997                 return $outText;
1998         }
1999
2000         /**
2001          * Given the id of an interface element, constructs the appropriate title
2002          * attribute from the system messages.  (Note, this is usually the id but
2003          * isn't always, because sometimes the accesskey needs to go on a different
2004          * element than the id, for reverse-compatibility, etc.)
2005          *
2006          * @since 1.16.3 $msgParams added in 1.27
2007          * @param string $name Id of the element, minus prefixes.
2008          * @param string|array|null $options Null, string or array with some of the following options:
2009          *   - 'withaccess' to add an access-key hint
2010          *   - 'nonexisting' to add an accessibility hint that page does not exist
2011          * @param array $msgParams Parameters to pass to the message
2012          *
2013          * @return string Contents of the title attribute (which you must HTML-
2014          *   escape), or false for no title attribute
2015          */
2016         public static function titleAttrib( $name, $options = null, array $msgParams = [] ) {
2017                 $message = wfMessage( "tooltip-$name", $msgParams );
2018                 if ( !$message->exists() ) {
2019                         $tooltip = false;
2020                 } else {
2021                         $tooltip = $message->text();
2022                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2023                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2024                         # Message equal to '-' means suppress it.
2025                         if ( $tooltip == '-' ) {
2026                                 $tooltip = false;
2027                         }
2028                 }
2029
2030                 $options = (array)$options;
2031
2032                 if ( in_array( 'nonexisting', $options ) ) {
2033                         $tooltip = wfMessage( 'red-link-title', $tooltip ?: '' )->text();
2034                 }
2035                 if ( in_array( 'withaccess', $options ) ) {
2036                         $accesskey = self::accesskey( $name );
2037                         if ( $accesskey !== false ) {
2038                                 // Should be build the same as in jquery.accessKeyLabel.js
2039                                 if ( $tooltip === false || $tooltip === '' ) {
2040                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2041                                 } else {
2042                                         $tooltip .= wfMessage( 'word-separator' )->text();
2043                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2044                                 }
2045                         }
2046                 }
2047
2048                 return $tooltip;
2049         }
2050
2051         public static $accesskeycache;
2052
2053         /**
2054          * Given the id of an interface element, constructs the appropriate
2055          * accesskey attribute from the system messages.  (Note, this is usually
2056          * the id but isn't always, because sometimes the accesskey needs to go on
2057          * a different element than the id, for reverse-compatibility, etc.)
2058          *
2059          * @since 1.16.3
2060          * @param string $name Id of the element, minus prefixes.
2061          * @return string Contents of the accesskey attribute (which you must HTML-
2062          *   escape), or false for no accesskey attribute
2063          */
2064         public static function accesskey( $name ) {
2065                 if ( isset( self::$accesskeycache[$name] ) ) {
2066                         return self::$accesskeycache[$name];
2067                 }
2068
2069                 $message = wfMessage( "accesskey-$name" );
2070
2071                 if ( !$message->exists() ) {
2072                         $accesskey = false;
2073                 } else {
2074                         $accesskey = $message->plain();
2075                         if ( $accesskey === '' || $accesskey === '-' ) {
2076                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2077                                 # attribute, but this is broken for accesskey: that might be a useful
2078                                 # value.
2079                                 $accesskey = false;
2080                         }
2081                 }
2082
2083                 self::$accesskeycache[$name] = $accesskey;
2084                 return self::$accesskeycache[$name];
2085         }
2086
2087         /**
2088          * Get a revision-deletion link, or disabled link, or nothing, depending
2089          * on user permissions & the settings on the revision.
2090          *
2091          * Will use forward-compatible revision ID in the Special:RevDelete link
2092          * if possible, otherwise the timestamp-based ID which may break after
2093          * undeletion.
2094          *
2095          * @param User $user
2096          * @param Revision $rev
2097          * @param LinkTarget $title
2098          * @return string HTML fragment
2099          */
2100         public static function getRevDeleteLink( User $user, Revision $rev, LinkTarget $title ) {
2101                 $canHide = $user->isAllowed( 'deleterevision' );
2102                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2103                         return '';
2104                 }
2105
2106                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2107                         return self::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2108                 }
2109                 $prefixedDbKey = MediaWikiServices::getInstance()->getTitleFormatter()->
2110                         getPrefixedDBkey( $title );
2111                 if ( $rev->getId() ) {
2112                         // RevDelete links using revision ID are stable across
2113                         // page deletion and undeletion; use when possible.
2114                         $query = [
2115                                 'type' => 'revision',
2116                                 'target' => $prefixedDbKey,
2117                                 'ids' => $rev->getId()
2118                         ];
2119                 } else {
2120                         // Older deleted entries didn't save a revision ID.
2121                         // We have to refer to these by timestamp, ick!
2122                         $query = [
2123                                 'type' => 'archive',
2124                                 'target' => $prefixedDbKey,
2125                                 'ids' => $rev->getTimestamp()
2126                         ];
2127                 }
2128                 return self::revDeleteLink( $query,
2129                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2130         }
2131
2132         /**
2133          * Creates a (show/hide) link for deleting revisions/log entries
2134          *
2135          * @param array $query Query parameters to be passed to link()
2136          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2137          * @param bool $delete Set to true to use (show/hide) rather than (show)
2138          *
2139          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2140          * span to allow for customization of appearance with CSS
2141          */
2142         public static function revDeleteLink( $query = [], $restricted = false, $delete = true ) {
2143                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2144                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2145                 $html = wfMessage( $msgKey )->escaped();
2146                 $tag = $restricted ? 'strong' : 'span';
2147                 $link = self::link( $sp, $html, [], $query, [ 'known', 'noclasses' ] );
2148                 return Xml::tags(
2149                         $tag,
2150                         [ 'class' => 'mw-revdelundel-link' ],
2151                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2152                 );
2153         }
2154
2155         /**
2156          * Creates a dead (show/hide) link for deleting revisions/log entries
2157          *
2158          * @since 1.16.3
2159          * @param bool $delete Set to true to use (show/hide) rather than (show)
2160          *
2161          * @return string HTML text wrapped in a span to allow for customization
2162          * of appearance with CSS
2163          */
2164         public static function revDeleteLinkDisabled( $delete = true ) {
2165                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2166                 $html = wfMessage( $msgKey )->escaped();
2167                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2168                 return Xml::tags( 'span', [ 'class' => 'mw-revdelundel-link' ], $htmlParentheses );
2169         }
2170
2171         /**
2172          * Returns the attributes for the tooltip and access key.
2173          *
2174          * @since 1.16.3. $msgParams introduced in 1.27
2175          * @param string $name
2176          * @param array $msgParams Params for constructing the message
2177          * @param string|array|null $options Options to be passed to titleAttrib.
2178          *
2179          * @see Linker::titleAttrib for what options could be passed to $options.
2180          *
2181          * @return array
2182          */
2183         public static function tooltipAndAccesskeyAttribs(
2184                 $name,
2185                 array $msgParams = [],
2186                 $options = null
2187         ) {
2188                 $options = (array)$options;
2189                 $options[] = 'withaccess';
2190
2191                 $attribs = [
2192                         'title' => self::titleAttrib( $name, $options, $msgParams ),
2193                         'accesskey' => self::accesskey( $name )
2194                 ];
2195                 if ( $attribs['title'] === false ) {
2196                         unset( $attribs['title'] );
2197                 }
2198                 if ( $attribs['accesskey'] === false ) {
2199                         unset( $attribs['accesskey'] );
2200                 }
2201                 return $attribs;
2202         }
2203
2204         /**
2205          * Returns raw bits of HTML, use titleAttrib()
2206          * @since 1.16.3
2207          * @param string $name
2208          * @param array|null $options
2209          * @return null|string
2210          */
2211         public static function tooltip( $name, $options = null ) {
2212                 $tooltip = self::titleAttrib( $name, $options );
2213                 if ( $tooltip === false ) {
2214                         return '';
2215                 }
2216                 return Xml::expandAttributes( [
2217                         'title' => $tooltip
2218                 ] );
2219         }
2220
2221 }