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
  24 /**
  25  * Some internal bits split of from Skin.php. These functions are used
  26  * for primarily page content: links, embedded images, table of contents. Links
  27  * are also used in the skin.
  28  *
  29  * @todo turn this into a legacy interface for HtmlPageLinkRenderer and similar services.
  30  *
  31  * @ingroup Skins
  32  */
  33 class Linker {
  34         /**
  35          * Flags for userToolLinks()
  36          */
  37         const TOOL_LINKS_NOBLOCK = 1;
  38         const TOOL_LINKS_EMAIL = 2;
  39
  40         /**
  41          * Get the appropriate HTML attributes to add to the "a" element of an interwiki link.
  42          *
  43          * @since 1.16.3
  44          * @deprecated since 1.25
  45          *
  46          * @param string $title The title text for the link, URL-encoded (???) but
  47          *   not HTML-escaped
  48          * @param string $unused Unused
  49          * @param string $class The contents of the class attribute; if an empty
  50          *   string is passed, which is the default value, defaults to 'external'.
  51          * @return string
  52          */
  53         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  54                 global $wgContLang;
  55
  56                 wfDeprecated( __METHOD__, '1.25' );
  57
  58                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  59                 # getExternalLinkAttributes, why?
  60                 $title = urldecode( $title );
  61                 $title = $wgContLang->checkTitleEncoding( $title );
  62                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  63
  64                 return self::getLinkAttributesInternal( $title, $class );
  65         }
  66
  67         /**
  68          * Get the appropriate HTML attributes to add to the "a" element of an internal link.
  69          *
  70          * @since 1.16.3
  71          * @deprecated since 1.25
  72          *
  73          * @param string $title The title text for the link, URL-encoded (???) but
  74          *   not HTML-escaped
  75          * @param string $unused Unused
  76          * @param string $class The contents of the class attribute, default none
  77          * @return string
  78          */
  79         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  80                 wfDeprecated( __METHOD__, '1.25' );
  81
  82                 $title = urldecode( $title );
  83                 $title = strtr( $title, '_', ' ' );
  84                 return self::getLinkAttributesInternal( $title, $class );
  85         }
  86
  87         /**
  88          * Get the appropriate HTML attributes to add to the "a" element of an internal
  89          * link, given the Title object for the page we want to link to.
  90          *
  91          * @since 1.16.3
  92          * @deprecated since 1.25
  93          *
  94          * @param Title $nt
  95          * @param string $unused Unused
  96          * @param string $class The contents of the class attribute, default none
  97          * @param string|bool $title Optional (unescaped) string to use in the title
  98          *   attribute; if false, default to the name of the page we're linking to
  99          * @return string
 100          */
 101         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
 102                 wfDeprecated( __METHOD__, '1.25' );
 103
 104                 if ( $title === false ) {
 105                         $title = $nt->getPrefixedText();
 106                 }
 107                 return self::getLinkAttributesInternal( $title, $class );
 108         }
 109
 110         /**
 111          * Common code for getLinkAttributesX functions
 112          *
 113          * @since 1.16.3
 114          * @deprecated since 1.25
 115          *
 116          * @param string $title
 117          * @param string $class
 118          *
 119          * @return string
 120          */
 121         private static function getLinkAttributesInternal( $title, $class ) {
 122                 wfDeprecated( __METHOD__, '1.25' );
 123
 124                 $title = htmlspecialchars( $title );
 125                 $class = htmlspecialchars( $class );
 126                 $r = '';
 127                 if ( $class != '' ) {
 128                         $r .= " class=\"$class\"";
 129                 }
 130                 if ( $title != '' ) {
 131                         $r .= " title=\"$title\"";
 132                 }
 133                 return $r;
 134         }
 135
 136         /**
 137          * Return the CSS colour of a known link
 138          *
 139          * @since 1.16.3
 140          * @param Title $t
 141          * @param int $threshold User defined threshold
 142          * @return string CSS class
 143          */
 144         public static function getLinkColour( $t, $threshold ) {
 145                 $colour = '';
 146                 if ( $t->isRedirect() ) {
 147                         # Page is a redirect
 148                         $colour = 'mw-redirect';
 149                 } elseif ( $threshold > 0 && $t->isContentPage() &&
 150                         $t->exists() && $t->getLength() < $threshold
 151                 ) {
 152                         # Page is a stub
 153                         $colour = 'stub';
 154                 }
 155                 return $colour;
 156         }
 157
 158         /**
 159          * This function returns an HTML link to the given target.  It serves a few
 160          * purposes:
 161          *   1) If $target is a Title, the correct URL to link to will be figured
 162          *      out automatically.
 163          *   2) It automatically adds the usual classes for various types of link
 164          *      targets: "new" for red links, "stub" for short articles, etc.
 165          *   3) It escapes all attribute values safely so there's no risk of XSS.
 166          *   4) It provides a default tooltip if the target is a Title (the page
 167          *      name of the target).
 168          * link() replaces the old functions in the makeLink() family.
 169          *
 170          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 171          *
 172          * @param Title $target Can currently only be a Title, but this may
 173          *   change to support Images, literal URLs, etc.
 174          * @param string $html The HTML contents of the <a> element, i.e.,
 175          *   the link text.  This is raw HTML and will not be escaped.  If null,
 176          *   defaults to the prefixed text of the Title; or if the Title is just a
 177          *   fragment, the contents of the fragment.
 178          * @param array $customAttribs A key => value array of extra HTML attributes,
 179          *   such as title and class.  (href is ignored.)  Classes will be
 180          *   merged with the default classes, while other attributes will replace
 181          *   default attributes.  All passed attribute values will be HTML-escaped.
 182          *   A false attribute value means to suppress that attribute.
 183          * @param array $query The query string to append to the URL
 184          *   you're linking to, in key => value array form.  Query keys and values
 185          *   will be URL-encoded.
 186          * @param string|array $options String or array of strings:
 187          *     'known': Page is known to exist, so don't check if it does.
 188          *     'broken': Page is known not to exist, so don't check if it does.
 189          *     'noclasses': Don't add any classes automatically (includes "new",
 190          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
 191          *       provided, if any, so you get a simple blue link with no funny i-
 192          *       cons.
 193          *     'forcearticlepath': Use the article path always, even with a querystring.
 194          *       Has compatibility issues on some setups, so avoid wherever possible.
 195          *     'http': Force a full URL with http:// as the scheme.
 196          *     'https': Force a full URL with https:// as the scheme.
 197          *     'stubThreshold' => (int): Stub threshold to use when determining link classes.
 198          * @return string HTML <a> attribute
 199          */
 200         public static function link(
 201                 $target, $html = null, $customAttribs = [], $query = [], $options = []
 202         ) {
 203                 if ( !$target instanceof Title ) {
 204                         wfWarn( __METHOD__ . ': Requires $target to be a Title object.', 2 );
 205                         return "<!-- ERROR -->$html";
 206                 }
 207
 208                 if ( is_string( $query ) ) {
 209                         // some functions withing core using this still hand over query strings
 210                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
 211                         $query = wfCgiToArray( $query );
 212                 }
 213                 $options = (array)$options;
 214
 215                 $dummy = new DummyLinker; // dummy linker instance for bc on the hooks
 216
 217                 $ret = null;
 218                 if ( !Hooks::run( 'LinkBegin',
 219                         [ $dummy, $target, &$html, &$customAttribs, &$query, &$options, &$ret ] )
 220                 ) {
 221                         return $ret;
 222                 }
 223
 224                 # Normalize the Title if it's a special page
 225                 $target = self::normaliseSpecialPage( $target );
 226
 227                 # If we don't know whether the page exists, let's find out.
 228                 if ( !in_array( 'known', $options, true ) && !in_array( 'broken', $options, true ) ) {
 229                         if ( $target->isKnown() ) {
 230                                 $options[] = 'known';
 231                         } else {
 232                                 $options[] = 'broken';
 233                         }
 234                 }
 235
 236                 $oldquery = [];
 237                 if ( in_array( "forcearticlepath", $options, true ) && $query ) {
 238                         $oldquery = $query;
 239                         $query = [];
 240                 }
 241
 242                 # Note: we want the href attribute first, for prettiness.
 243                 $attribs = [ 'href' => self::linkUrl( $target, $query, $options ) ];
 244                 if ( in_array( 'forcearticlepath', $options, true ) && $oldquery ) {
 245                         $attribs['href'] = wfAppendQuery( $attribs['href'], $oldquery );
 246                 }
 247
 248                 $attribs = array_merge(
 249                         $attribs,
 250                         self::linkAttribs( $target, $customAttribs, $options )
 251                 );
 252                 if ( is_null( $html ) ) {
 253                         $html = self::linkText( $target );
 254                 }
 255
 256                 $ret = null;
 257                 if ( Hooks::run( 'LinkEnd', [ $dummy, $target, $options, &$html, &$attribs, &$ret ] ) ) {
 258                         $ret = Html::rawElement( 'a', $attribs, $html );
 259                 }
 260
 261                 return $ret;
 262         }
 263
 264         /**
 265          * Identical to link(), except $options defaults to 'known'.
 266          * @since 1.16.3
 267          * @see Linker::link
 268          * @return string
 269          */
 270         public static function linkKnown(
 271                 $target, $html = null, $customAttribs = [],
 272                 $query = [], $options = [ 'known' ]
 273         ) {
 274                 return self::link( $target, $html, $customAttribs, $query, $options );
 275         }
 276
 277         /**
 278          * Returns the Url used to link to a Title
 279          *
 280          * @param LinkTarget $target
 281          * @param array $query Query parameters
 282          * @param array $options
 283          * @return string
 284          */
 285         private static function linkUrl( LinkTarget $target, $query, $options ) {
 286                 # We don't want to include fragments for broken links, because they
 287                 # generally make no sense.
 288                 if ( in_array( 'broken', $options, true ) && $target->hasFragment() ) {
 289                         $target = $target->createFragmentTarget( '' );
 290                 }
 291
 292                 # If it's a broken link, add the appropriate query pieces, unless
 293                 # there's already an action specified, or unless 'edit' makes no sense
 294                 # (i.e., for a nonexistent special page).
 295                 if ( in_array( 'broken', $options, true ) && empty( $query['action'] )
 296                         && $target->getNamespace() !== NS_SPECIAL ) {
 297                         $query['action'] = 'edit';
 298                         $query['redlink'] = '1';
 299                 }
 300
 301                 if ( in_array( 'http', $options, true ) ) {
 302                         $proto = PROTO_HTTP;
 303                 } elseif ( in_array( 'https', $options, true ) ) {
 304                         $proto = PROTO_HTTPS;
 305                 } else {
 306                         $proto = PROTO_RELATIVE;
 307                 }
 308
 309                 $title = Title::newFromLinkTarget( $target );
 310                 $ret = $title->getLinkURL( $query, false, $proto );
 311                 return $ret;
 312         }
 313
 314         /**
 315          * Returns the array of attributes used when linking to the Title $target
 316          *
 317          * @param Title $target
 318          * @param array $attribs
 319          * @param array $options
 320          *
 321          * @return array
 322          */
 323         private static function linkAttribs( $target, $attribs, $options ) {
 324                 global $wgUser;
 325                 $defaults = [];
 326
 327                 if ( !in_array( 'noclasses', $options, true ) ) {
 328                         # Now build the classes.
 329                         $classes = [];
 330
 331                         if ( in_array( 'broken', $options, true ) ) {
 332                                 $classes[] = 'new';
 333                         }
 334
 335                         if ( $target->isExternal() ) {
 336                                 $classes[] = 'extiw';
 337                         }
 338
 339                         if ( !in_array( 'broken', $options, true ) ) { # Avoid useless calls to LinkCache (see r50387)
 340                                 $colour = self::getLinkColour(
 341                                         $target,
 342                                         isset( $options['stubThreshold'] ) ? $options['stubThreshold'] : $wgUser->getStubThreshold()
 343                                 );
 344                                 if ( $colour !== '' ) {
 345                                         $classes[] = $colour; # mw-redirect or stub
 346                                 }
 347                         }
 348                         if ( $classes != [] ) {
 349                                 $defaults['class'] = implode( ' ', $classes );
 350                         }
 351                 }
 352
 353                 # Get a default title attribute.
 354                 if ( $target->getPrefixedText() == '' ) {
 355                         # A link like [[#Foo]].  This used to mean an empty title
 356                         # attribute, but that's silly.  Just don't output a title.
 357                 } elseif ( in_array( 'known', $options, true ) ) {
 358                         $defaults['title'] = $target->getPrefixedText();
 359                 } else {
 360                         // This ends up in parser cache!
 361                         $defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )
 362                                 ->inContentLanguage()
 363                                 ->text();
 364                 }
 365
 366                 # Finally, merge the custom attribs with the default ones, and iterate
 367                 # over that, deleting all "false" attributes.
 368                 $ret = [];
 369                 $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
 370                 foreach ( $merged as $key => $val ) {
 371                         # A false value suppresses the attribute, and we don't want the
 372                         # href attribute to be overridden.
 373                         if ( $key != 'href' && $val !== false ) {
 374                                 $ret[$key] = $val;
 375                         }
 376                 }
 377                 return $ret;
 378         }
 379
 380         /**
 381          * Default text of the links to the Title $target
 382          *
 383          * @param Title $target
 384          *
 385          * @return string
 386          */
 387         private static function linkText( $target ) {
 388                 if ( !$target instanceof Title ) {
 389                         wfWarn( __METHOD__ . ': Requires $target to be a Title object.' );
 390                         return '';
 391                 }
 392                 // If the target is just a fragment, with no title, we return the fragment
 393                 // text.  Otherwise, we return the title text itself.
 394                 if ( $target->getPrefixedText() === '' && $target->hasFragment() ) {
 395                         return htmlspecialchars( $target->getFragment() );
 396                 }
 397
 398                 return htmlspecialchars( $target->getPrefixedText() );
 399         }
 400
 401         /**
 402          * Make appropriate markup for a link to the current article. This is
 403          * currently rendered as the bold link text. The calling sequence is the
 404          * same as the other make*LinkObj static functions, despite $query not
 405          * being used.
 406          *
 407          * @since 1.16.3
 408          * @param Title $nt
 409          * @param string $html [optional]
 410          * @param string $query [optional]
 411          * @param string $trail [optional]
 412          * @param string $prefix [optional]
 413          *
 414          * @return string
 415          */
 416         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 417                 $ret = "<strong class=\"selflink\">{$prefix}{$html}</strong>{$trail}";
 418                 if ( !Hooks::run( 'SelfLinkBegin', [ $nt, &$html, &$trail, &$prefix, &$ret ] ) ) {
 419                         return $ret;
 420                 }
 421
 422                 if ( $html == '' ) {
 423                         $html = htmlspecialchars( $nt->getPrefixedText() );
 424                 }
 425                 list( $inside, $trail ) = self::splitTrail( $trail );
 426                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 427         }
 428
 429         /**
 430          * Get a message saying that an invalid title was encountered.
 431          * This should be called after a method like Title::makeTitleSafe() returned
 432          * a value indicating that the title object is invalid.
 433          *
 434          * @param IContextSource $context Context to use to get the messages
 435          * @param int $namespace Namespace number
 436          * @param string $title Text of the title, without the namespace part
 437          * @return string
 438          */
 439         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 440                 global $wgContLang;
 441
 442                 // First we check whether the namespace exists or not.
 443                 if ( MWNamespace::exists( $namespace ) ) {
 444                         if ( $namespace == NS_MAIN ) {
 445                                 $name = $context->msg( 'blanknamespace' )->text();
 446                         } else {
 447                                 $name = $wgContLang->getFormattedNsText( $namespace );
 448                         }
 449                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 450                 } else {
 451                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 452                 }
 453         }
 454
 455         /**
 456          * @since 1.16.3
 457          * @param LinkTarget $target
 458          * @return LinkTarget|Title You will get back the same type you passed in, or a Title object
 459          */
 460         public static function normaliseSpecialPage( LinkTarget $target ) {
 461                 if ( $target->getNamespace() == NS_SPECIAL ) {
 462                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $target->getDBkey() );
 463                         if ( !$name ) {
 464                                 return $target;
 465                         }
 466                         $ret = SpecialPage::getTitleFor( $name, $subpage, $target->getFragment() );
 467                         return $ret;
 468                 } else {
 469                         return $target;
 470                 }
 471         }
 472
 473         /**
 474          * Returns the filename part of an url.
 475          * Used as alternative text for external images.
 476          *
 477          * @param string $url
 478          *
 479          * @return string
 480          */
 481         private static function fnamePart( $url ) {
 482                 $basename = strrchr( $url, '/' );
 483                 if ( false === $basename ) {
 484                         $basename = $url;
 485                 } else {
 486                         $basename = substr( $basename, 1 );
 487                 }
 488                 return $basename;
 489         }
 490
 491         /**
 492          * Return the code for images which were added via external links,
 493          * via Parser::maybeMakeExternalImage().
 494          *
 495          * @since 1.16.3
 496          * @param string $url
 497          * @param string $alt
 498          *
 499          * @return string
 500          */
 501         public static function makeExternalImage( $url, $alt = '' ) {
 502                 if ( $alt == '' ) {
 503                         $alt = self::fnamePart( $url );
 504                 }
 505                 $img = '';
 506                 $success = Hooks::run( 'LinkerMakeExternalImage', [ &$url, &$alt, &$img ] );
 507                 if ( !$success ) {
 508                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 509                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 510                         return $img;
 511                 }
 512                 return Html::element( 'img',
 513                         [
 514                                 'src' => $url,
 515                                 'alt' => $alt ] );
 516         }
 517
 518         /**
 519          * Given parameters derived from [[Image:Foo|options...]], generate the
 520          * HTML that that syntax inserts in the page.
 521          *
 522          * @param Parser $parser
 523          * @param Title $title Title object of the file (not the currently viewed page)
 524          * @param File $file File object, or false if it doesn't exist
 525          * @param array $frameParams Associative array of parameters external to the media handler.
 526          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 527          *     will often be false.
 528          *          thumbnail       If present, downscale and frame
 529          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 530          *          framed          Shows image in original size in a frame
 531          *          frameless       Downscale but don't frame
 532          *          upright         If present, tweak default sizes for portrait orientation
 533          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 534          *          border          If present, show a border around the image
 535          *          align           Horizontal alignment (left, right, center, none)
 536          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 537          *                          bottom, text-bottom)
 538          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 539          *          class           HTML for image classes. Plain text.
 540          *          caption         HTML for image caption.
 541          *          link-url        URL to link to
 542          *          link-title      Title object to link to
 543          *          link-target     Value for the target attribute, only with link-url
 544          *          no-link         Boolean, suppress description link
 545          *
 546          * @param array $handlerParams Associative array of media handler parameters, to be passed
 547          *       to transform(). Typical keys are "width" and "page".
 548          * @param string|bool $time Timestamp of the file, set as false for current
 549          * @param string $query Query params for desc url
 550          * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
 551          * @since 1.20
 552          * @return string HTML for an image, with links, wrappers, etc.
 553          */
 554         public static function makeImageLink( Parser $parser, Title $title,
 555                 $file, $frameParams = [], $handlerParams = [], $time = false,
 556                 $query = "", $widthOption = null
 557         ) {
 558                 $res = null;
 559                 $dummy = new DummyLinker;
 560                 if ( !Hooks::run( 'ImageBeforeProduceHTML', [ &$dummy, &$title,
 561                         &$file, &$frameParams, &$handlerParams, &$time, &$res ] ) ) {
 562                         return $res;
 563                 }
 564
 565                 if ( $file && !$file->allowInlineDisplay() ) {
 566                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 567                         return self::link( $title );
 568                 }
 569
 570                 // Shortcuts
 571                 $fp =& $frameParams;
 572                 $hp =& $handlerParams;
 573
 574                 // Clean up parameters
 575                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 576                 if ( !isset( $fp['align'] ) ) {
 577                         $fp['align'] = '';
 578                 }
 579                 if ( !isset( $fp['alt'] ) ) {
 580                         $fp['alt'] = '';
 581                 }
 582                 if ( !isset( $fp['title'] ) ) {
 583                         $fp['title'] = '';
 584                 }
 585                 if ( !isset( $fp['class'] ) ) {
 586                         $fp['class'] = '';
 587                 }
 588
 589                 $prefix = $postfix = '';
 590
 591                 if ( 'center' == $fp['align'] ) {
 592                         $prefix = '<div class="center">';
 593                         $postfix = '</div>';
 594                         $fp['align'] = 'none';
 595                 }
 596                 if ( $file && !isset( $hp['width'] ) ) {
 597                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 598                                 // If its a vector image, and user only specifies height
 599                                 // we don't want it to be limited by its "normal" width.
 600                                 global $wgSVGMaxSize;
 601                                 $hp['width'] = $wgSVGMaxSize;
 602                         } else {
 603                                 $hp['width'] = $file->getWidth( $page );
 604                         }
 605
 606                         if ( isset( $fp['thumbnail'] )
 607                                 || isset( $fp['manualthumb'] )
 608                                 || isset( $fp['framed'] )
 609                                 || isset( $fp['frameless'] )
 610                                 || !$hp['width']
 611                         ) {
 612                                 global $wgThumbLimits, $wgThumbUpright;
 613
 614                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 615                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 616                                 }
 617
 618                                 // Reduce width for upright images when parameter 'upright' is used
 619                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 620                                         $fp['upright'] = $wgThumbUpright;
 621                                 }
 622
 623                                 // For caching health: If width scaled down due to upright
 624                                 // parameter, round to full __0 pixel to avoid the creation of a
 625                                 // lot of odd thumbs.
 626                                 $prefWidth = isset( $fp['upright'] ) ?
 627                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 628                                         $wgThumbLimits[$widthOption];
 629
 630                                 // Use width which is smaller: real image width or user preference width
 631                                 // Unless image is scalable vector.
 632                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 633                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 634                                         $hp['width'] = $prefWidth;
 635                                 }
 636                         }
 637                 }
 638
 639                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 640                         # Create a thumbnail. Alignment depends on the writing direction of
 641                         # the page content language (right-aligned for LTR languages,
 642                         # left-aligned for RTL languages)
 643                         # If a thumbnail width has not been provided, it is set
 644                         # to the default user option as specified in Language*.php
 645                         if ( $fp['align'] == '' ) {
 646                                 $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 647                         }
 648                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 649                 }
 650
 651                 if ( $file && isset( $fp['frameless'] ) ) {
 652                         $srcWidth = $file->getWidth( $page );
 653                         # For "frameless" option: do not present an image bigger than the
 654                         # source (for bitmap-style images). This is the same behavior as the
 655                         # "thumb" option does it already.
 656                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 657                                 $hp['width'] = $srcWidth;
 658                         }
 659                 }
 660
 661                 if ( $file && isset( $hp['width'] ) ) {
 662                         # Create a resized image, without the additional thumbnail features
 663                         $thumb = $file->transform( $hp );
 664                 } else {
 665                         $thumb = false;
 666                 }
 667
 668                 if ( !$thumb ) {
 669                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 670                 } else {
 671                         self::processResponsiveImages( $file, $thumb, $hp );
 672                         $params = [
 673                                 'alt' => $fp['alt'],
 674                                 'title' => $fp['title'],
 675                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 676                                 'img-class' => $fp['class'] ];
 677                         if ( isset( $fp['border'] ) ) {
 678                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 679                         }
 680                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 681
 682                         $s = $thumb->toHtml( $params );
 683                 }
 684                 if ( $fp['align'] != '' ) {
 685                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 686                 }
 687                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 688         }
 689
 690         /**
 691          * Get the link parameters for MediaTransformOutput::toHtml() from given
 692          * frame parameters supplied by the Parser.
 693          * @param array $frameParams The frame parameters
 694          * @param string $query An optional query string to add to description page links
 695          * @param Parser|null $parser
 696          * @return array
 697          */
 698         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 699                 $mtoParams = [];
 700                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 701                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 702                         if ( isset( $frameParams['link-target'] ) ) {
 703                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 704                         }
 705                         if ( $parser ) {
 706                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 707                                 foreach ( $extLinkAttrs as $name => $val ) {
 708                                         // Currently could include 'rel' and 'target'
 709                                         $mtoParams['parser-extlink-' . $name] = $val;
 710                                 }
 711                         }
 712                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 713                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 714                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 715                         // No link
 716                 } else {
 717                         $mtoParams['desc-link'] = true;
 718                         $mtoParams['desc-query'] = $query;
 719                 }
 720                 return $mtoParams;
 721         }
 722
 723         /**
 724          * Make HTML for a thumbnail including image, border and caption
 725          * @param Title $title
 726          * @param File|bool $file File object or false if it doesn't exist
 727          * @param string $label
 728          * @param string $alt
 729          * @param string $align
 730          * @param array $params
 731          * @param bool $framed
 732          * @param string $manualthumb
 733          * @return string
 734          */
 735         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 736                 $align = 'right', $params = [], $framed = false, $manualthumb = ""
 737         ) {
 738                 $frameParams = [
 739                         'alt' => $alt,
 740                         'caption' => $label,
 741                         'align' => $align
 742                 ];
 743                 if ( $framed ) {
 744                         $frameParams['framed'] = true;
 745                 }
 746                 if ( $manualthumb ) {
 747                         $frameParams['manualthumb'] = $manualthumb;
 748                 }
 749                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 750         }
 751
 752         /**
 753          * @param Title $title
 754          * @param File $file
 755          * @param array $frameParams
 756          * @param array $handlerParams
 757          * @param bool $time
 758          * @param string $query
 759          * @return string
 760          */
 761         public static function makeThumbLink2( Title $title, $file, $frameParams = [],
 762                 $handlerParams = [], $time = false, $query = ""
 763         ) {
 764                 $exists = $file && $file->exists();
 765
 766                 # Shortcuts
 767                 $fp =& $frameParams;
 768                 $hp =& $handlerParams;
 769
 770                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 771                 if ( !isset( $fp['align'] ) ) {
 772                         $fp['align'] = 'right';
 773                 }
 774                 if ( !isset( $fp['alt'] ) ) {
 775                         $fp['alt'] = '';
 776                 }
 777                 if ( !isset( $fp['title'] ) ) {
 778                         $fp['title'] = '';
 779                 }
 780                 if ( !isset( $fp['caption'] ) ) {
 781                         $fp['caption'] = '';
 782                 }
 783
 784                 if ( empty( $hp['width'] ) ) {
 785                         // Reduce width for upright images when parameter 'upright' is used
 786                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 787                 }
 788                 $thumb = false;
 789                 $noscale = false;
 790                 $manualthumb = false;
 791
 792                 if ( !$exists ) {
 793                         $outerWidth = $hp['width'] + 2;
 794                 } else {
 795                         if ( isset( $fp['manualthumb'] ) ) {
 796                                 # Use manually specified thumbnail
 797                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 798                                 if ( $manual_title ) {
 799                                         $manual_img = wfFindFile( $manual_title );
 800                                         if ( $manual_img ) {
 801                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 802                                                 $manualthumb = true;
 803                                         } else {
 804                                                 $exists = false;
 805                                         }
 806                                 }
 807                         } elseif ( isset( $fp['framed'] ) ) {
 808                                 // Use image dimensions, don't scale
 809                                 $thumb = $file->getUnscaledThumb( $hp );
 810                                 $noscale = true;
 811                         } else {
 812                                 # Do not present an image bigger than the source, for bitmap-style images
 813                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 814                                 $srcWidth = $file->getWidth( $page );
 815                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 816                                         $hp['width'] = $srcWidth;
 817                                 }
 818                                 $thumb = $file->transform( $hp );
 819                         }
 820
 821                         if ( $thumb ) {
 822                                 $outerWidth = $thumb->getWidth() + 2;
 823                         } else {
 824                                 $outerWidth = $hp['width'] + 2;
 825                         }
 826                 }
 827
 828                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 829                 # So we don't need to pass it here in $query. However, the URL for the
 830                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 831                 $url = $title->getLocalURL( $query );
 832                 if ( $page ) {
 833                         $url = wfAppendQuery( $url, [ 'page' => $page ] );
 834                 }
 835                 if ( $manualthumb
 836                         && !isset( $fp['link-title'] )
 837                         && !isset( $fp['link-url'] )
 838                         && !isset( $fp['no-link'] ) ) {
 839                         $fp['link-url'] = $url;
 840                 }
 841
 842                 $s = "<div class=\"thumb t{$fp['align']}\">"
 843                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 844
 845                 if ( !$exists ) {
 846                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 847                         $zoomIcon = '';
 848                 } elseif ( !$thumb ) {
 849                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 850                         $zoomIcon = '';
 851                 } else {
 852                         if ( !$noscale && !$manualthumb ) {
 853                                 self::processResponsiveImages( $file, $thumb, $hp );
 854                         }
 855                         $params = [
 856                                 'alt' => $fp['alt'],
 857                                 'title' => $fp['title'],
 858                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
 859                                         ? $fp['class'] . ' '
 860                                         : '' ) . 'thumbimage'
 861                         ];
 862                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 863                         $s .= $thumb->toHtml( $params );
 864                         if ( isset( $fp['framed'] ) ) {
 865                                 $zoomIcon = "";
 866                         } else {
 867                                 $zoomIcon = Html::rawElement( 'div', [ 'class' => 'magnify' ],
 868                                         Html::rawElement( 'a', [
 869                                                 'href' => $url,
 870                                                 'class' => 'internal',
 871                                                 'title' => wfMessage( 'thumbnail-more' )->text() ],
 872                                                 "" ) );
 873                         }
 874                 }
 875                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 876                 return str_replace( "\n", ' ', $s );
 877         }
 878
 879         /**
 880          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 881          * applicable.
 882          *
 883          * @param File $file
 884          * @param MediaTransformOutput $thumb
 885          * @param array $hp Image parameters
 886          */
 887         public static function processResponsiveImages( $file, $thumb, $hp ) {
 888                 global $wgResponsiveImages;
 889                 if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
 890                         $hp15 = $hp;
 891                         $hp15['width'] = round( $hp['width'] * 1.5 );
 892                         $hp20 = $hp;
 893                         $hp20['width'] = $hp['width'] * 2;
 894                         if ( isset( $hp['height'] ) ) {
 895                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 896                                 $hp20['height'] = $hp['height'] * 2;
 897                         }
 898
 899                         $thumb15 = $file->transform( $hp15 );
 900                         $thumb20 = $file->transform( $hp20 );
 901                         if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
 902                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 903                         }
 904                         if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
 905                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 906                         }
 907                 }
 908         }
 909
 910         /**
 911          * Make a "broken" link to an image
 912          *
 913          * @since 1.16.3
 914          * @param Title $title
 915          * @param string $label Link label (plain text)
 916          * @param string $query Query string
 917          * @param string $unused1 Unused parameter kept for b/c
 918          * @param string $unused2 Unused parameter kept for b/c
 919          * @param bool $time A file of a certain timestamp was requested
 920          * @return string
 921          */
 922         public static function makeBrokenImageLinkObj( $title, $label = '',
 923                 $query = '', $unused1 = '', $unused2 = '', $time = false
 924         ) {
 925                 if ( !$title instanceof Title ) {
 926                         wfWarn( __METHOD__ . ': Requires $title to be a Title object.' );
 927                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 928                 }
 929
 930                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 931                 if ( $label == '' ) {
 932                         $label = $title->getPrefixedText();
 933                 }
 934                 $encLabel = htmlspecialchars( $label );
 935                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 936
 937                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 938                         && !$currentExists
 939                 ) {
 940                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 941
 942                         if ( $redir ) {
 943                                 // We already know it's a redirect, so mark it
 944                                 // accordingly
 945                                 return self::link(
 946                                         $title,
 947                                         $encLabel,
 948                                         [ 'class' => 'mw-redirect' ],
 949                                         wfCgiToArray( $query ),
 950                                         [ 'known', 'noclasses' ]
 951                                 );
 952                         }
 953
 954                         $href = self::getUploadUrl( $title, $query );
 955
 956                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 957                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 958                                 $encLabel . '</a>';
 959                 }
 960
 961                 return self::link( $title, $encLabel, [], wfCgiToArray( $query ), [ 'known', 'noclasses' ] );
 962         }
 963
 964         /**
 965          * Get the URL to upload a certain file
 966          *
 967          * @since 1.16.3
 968          * @param Title $destFile Title object of the file to upload
 969          * @param string $query Urlencoded query string to prepend
 970          * @return string Urlencoded URL
 971          */
 972         protected static function getUploadUrl( $destFile, $query = '' ) {
 973                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 974                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 975                 if ( $query != '' ) {
 976                         $q .= '&' . $query;
 977                 }
 978
 979                 if ( $wgUploadMissingFileUrl ) {
 980                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 981                 } elseif ( $wgUploadNavigationUrl ) {
 982                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 983                 } else {
 984                         $upload = SpecialPage::getTitleFor( 'Upload' );
 985                         return $upload->getLocalURL( $q );
 986                 }
 987         }
 988
 989         /**
 990          * Create a direct link to a given uploaded file.
 991          *
 992          * @since 1.16.3
 993          * @param Title $title
 994          * @param string $html Pre-sanitized HTML
 995          * @param string $time MW timestamp of file creation time
 996          * @return string HTML
 997          */
 998         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 999                 $img = wfFindFile( $title, [ 'time' => $time ] );
1000                 return self::makeMediaLinkFile( $title, $img, $html );
1001         }
1002
1003         /**
1004          * Create a direct link to a given uploaded file.
1005          * This will make a broken link if $file is false.
1006          *
1007          * @since 1.16.3
1008          * @param Title $title
1009          * @param File|bool $file File object or false
1010          * @param string $html Pre-sanitized HTML
1011          * @return string HTML
1012          *
1013          * @todo Handle invalid or missing images better.
1014          */
1015         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
1016                 if ( $file && $file->exists() ) {
1017                         $url = $file->getUrl();
1018                         $class = 'internal';
1019                 } else {
1020                         $url = self::getUploadUrl( $title );
1021                         $class = 'new';
1022                 }
1023
1024                 $alt = $title->getText();
1025                 if ( $html == '' ) {
1026                         $html = $alt;
1027                 }
1028
1029                 $ret = '';
1030                 $attribs = [
1031                         'href' => $url,
1032                         'class' => $class,
1033                         'title' => $alt
1034                 ];
1035
1036                 if ( !Hooks::run( 'LinkerMakeMediaLinkFile',
1037                         [ $title, $file, &$html, &$attribs, &$ret ] ) ) {
1038                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
1039                                 . "with url {$url} and text {$html} to {$ret}\n", true );
1040                         return $ret;
1041                 }
1042
1043                 return Html::rawElement( 'a', $attribs, $html );
1044         }
1045
1046         /**
1047          * Make a link to a special page given its name and, optionally,
1048          * a message key from the link text.
1049          * Usage example: Linker::specialLink( 'Recentchanges' )
1050          *
1051          * @since 1.16.3
1052          * @param string $name
1053          * @param string $key
1054          * @return string
1055          */
1056         public static function specialLink( $name, $key = '' ) {
1057                 if ( $key == '' ) {
1058                         $key = strtolower( $name );
1059                 }
1060
1061                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
1062         }
1063
1064         /**
1065          * Make an external link
1066          * @since 1.16.3. $title added in 1.21
1067          * @param string $url URL to link to
1068          * @param string $text Text of link
1069          * @param bool $escape Do we escape the link text?
1070          * @param string $linktype Type of external link. Gets added to the classes
1071          * @param array $attribs Array of extra attributes to <a>
1072          * @param Title|null $title Title object used for title specific link attributes
1073          * @return string
1074          */
1075         public static function makeExternalLink( $url, $text, $escape = true,
1076                 $linktype = '', $attribs = [], $title = null
1077         ) {
1078                 global $wgTitle;
1079                 $class = "external";
1080                 if ( $linktype ) {
1081                         $class .= " $linktype";
1082                 }
1083                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1084                         $class .= " {$attribs['class']}";
1085                 }
1086                 $attribs['class'] = $class;
1087
1088                 if ( $escape ) {
1089                         $text = htmlspecialchars( $text );
1090                 }
1091
1092                 if ( !$title ) {
1093                         $title = $wgTitle;
1094                 }
1095                 $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
1096                 $link = '';
1097                 $success = Hooks::run( 'LinkerMakeExternalLink',
1098                         [ &$url, &$text, &$link, &$attribs, $linktype ] );
1099                 if ( !$success ) {
1100                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
1101                                 . "with url {$url} and text {$text} to {$link}\n", true );
1102                         return $link;
1103                 }
1104                 $attribs['href'] = $url;
1105                 return Html::rawElement( 'a', $attribs, $text );
1106         }
1107
1108         /**
1109          * Make user link (or user contributions for unregistered users)
1110          * @param int $userId User id in database.
1111          * @param string $userName User name in database.
1112          * @param string $altUserName Text to display instead of the user name (optional)
1113          * @return string HTML fragment
1114          * @since 1.16.3. $altUserName was added in 1.19.
1115          */
1116         public static function userLink( $userId, $userName, $altUserName = false ) {
1117                 $classes = 'mw-userlink';
1118                 if ( $userId == 0 ) {
1119                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1120                         if ( $altUserName === false ) {
1121                                 $altUserName = IP::prettifyIP( $userName );
1122                         }
1123                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
1124                 } else {
1125                         $page = Title::makeTitle( NS_USER, $userName );
1126                 }
1127
1128                 return self::link(
1129                         $page,
1130                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1131                         [ 'class' => $classes ]
1132                 );
1133         }
1134
1135         /**
1136          * Generate standard user tool links (talk, contributions, block link, etc.)
1137          *
1138          * @since 1.16.3
1139          * @param int $userId User identifier
1140          * @param string $userText User name or IP address
1141          * @param bool $redContribsWhenNoEdits Should the contributions link be
1142          *   red if the user has no edits?
1143          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
1144          *   and Linker::TOOL_LINKS_EMAIL).
1145          * @param int $edits User edit count (optional, for performance)
1146          * @return string HTML fragment
1147          */
1148         public static function userToolLinks(
1149                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1150         ) {
1151                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1152                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1153                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1154                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1155
1156                 $items = [];
1157                 if ( $talkable ) {
1158                         $items[] = self::userTalkLink( $userId, $userText );
1159                 }
1160                 if ( $userId ) {
1161                         // check if the user has an edit
1162                         $attribs = [];
1163                         if ( $redContribsWhenNoEdits ) {
1164                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1165                                         $user = User::newFromId( $userId );
1166                                         $edits = $user->getEditCount();
1167                                 }
1168                                 if ( $edits === 0 ) {
1169                                         $attribs['class'] = 'new';
1170                                 }
1171                         }
1172                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1173
1174                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1175                 }
1176                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1177                         $items[] = self::blockLink( $userId, $userText );
1178                 }
1179
1180                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1181                         $items[] = self::emailLink( $userId, $userText );
1182                 }
1183
1184                 Hooks::run( 'UserToolLinksEdit', [ $userId, $userText, &$items ] );
1185
1186                 if ( $items ) {
1187                         return wfMessage( 'word-separator' )->escaped()
1188                                 . '<span class="mw-usertoollinks">'
1189                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1190                                 . '</span>';
1191                 } else {
1192                         return '';
1193                 }
1194         }
1195
1196         /**
1197          * Alias for userToolLinks( $userId, $userText, true );
1198          * @since 1.16.3
1199          * @param int $userId User identifier
1200          * @param string $userText User name or IP address
1201          * @param int $edits User edit count (optional, for performance)
1202          * @return string
1203          */
1204         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1205                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1206         }
1207
1208         /**
1209          * @since 1.16.3
1210          * @param int $userId User id in database.
1211          * @param string $userText User name in database.
1212          * @return string HTML fragment with user talk link
1213          */
1214         public static function userTalkLink( $userId, $userText ) {
1215                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1216                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1217                 return $userTalkLink;
1218         }
1219
1220         /**
1221          * @since 1.16.3
1222          * @param int $userId Userid
1223          * @param string $userText User name in database.
1224          * @return string HTML fragment with block link
1225          */
1226         public static function blockLink( $userId, $userText ) {
1227                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1228                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1229                 return $blockLink;
1230         }
1231
1232         /**
1233          * @param int $userId Userid
1234          * @param string $userText User name in database.
1235          * @return string HTML fragment with e-mail user link
1236          */
1237         public static function emailLink( $userId, $userText ) {
1238                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1239                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1240                 return $emailLink;
1241         }
1242
1243         /**
1244          * Generate a user link if the current user is allowed to view it
1245          * @since 1.16.3
1246          * @param Revision $rev
1247          * @param bool $isPublic Show only if all users can see it
1248          * @return string HTML fragment
1249          */
1250         public static function revUserLink( $rev, $isPublic = false ) {
1251                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1252                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1253                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1254                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1255                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1256                 } else {
1257                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1258                 }
1259                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1260                         return '<span class="history-deleted">' . $link . '</span>';
1261                 }
1262                 return $link;
1263         }
1264
1265         /**
1266          * Generate a user tool link cluster if the current user is allowed to view it
1267          * @since 1.16.3
1268          * @param Revision $rev
1269          * @param bool $isPublic Show only if all users can see it
1270          * @return string HTML
1271          */
1272         public static function revUserTools( $rev, $isPublic = false ) {
1273                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1274                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1275                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1276                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1277                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1278                         $link = self::userLink( $userId, $userText )
1279                                 . self::userToolLinks( $userId, $userText );
1280                 } else {
1281                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1282                 }
1283                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1284                         return ' <span class="history-deleted">' . $link . '</span>';
1285                 }
1286                 return $link;
1287         }
1288
1289         /**
1290          * This function is called by all recent changes variants, by the page history,
1291          * and by the user contributions list. It is responsible for formatting edit
1292          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1293          * auto-generated comments (from section editing) and formats [[wikilinks]].
1294          *
1295          * @author Erik Moeller <moeller@scireview.de>
1296          * @since 1.16.3. $wikiId added in 1.26
1297          *
1298          * Note: there's not always a title to pass to this function.
1299          * Since you can't set a default parameter for a reference, I've turned it
1300          * temporarily to a value pass. Should be adjusted further. --brion
1301          *
1302          * @param string $comment
1303          * @param Title|null $title Title object (to generate link to the section in autocomment)
1304          *  or null
1305          * @param bool $local Whether section links should refer to local page
1306          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1307          *  For use with external changes.
1308          *
1309          * @return mixed|string
1310          */
1311         public static function formatComment(
1312                 $comment, $title = null, $local = false, $wikiId = null
1313         ) {
1314                 # Sanitize text a bit:
1315                 $comment = str_replace( "\n", " ", $comment );
1316                 # Allow HTML entities (for bug 13815)
1317                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1318
1319                 # Render autocomments and make links:
1320                 $comment = self::formatAutocomments( $comment, $title, $local, $wikiId );
1321                 $comment = self::formatLinksInComment( $comment, $title, $local, $wikiId );
1322
1323                 return $comment;
1324         }
1325
1326         /**
1327          * Converts autogenerated comments in edit summaries into section links.
1328          *
1329          * The pattern for autogen comments is / * foo * /, which makes for
1330          * some nasty regex.
1331          * We look for all comments, match any text before and after the comment,
1332          * add a separator where needed and format the comment itself with CSS
1333          * Called by Linker::formatComment.
1334          *
1335          * @param string $comment Comment text
1336          * @param Title|null $title An optional title object used to links to sections
1337          * @param bool $local Whether section links should refer to local page
1338          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1339          *  as used by WikiMap.
1340          *
1341          * @return string Formatted comment (wikitext)
1342          */
1343         private static function formatAutocomments(
1344                 $comment, $title = null, $local = false, $wikiId = null
1345         ) {
1346                 // @todo $append here is something of a hack to preserve the status
1347                 // quo. Someone who knows more about bidi and such should decide
1348                 // (1) what sane rendering even *is* for an LTR edit summary on an RTL
1349                 // wiki, both when autocomments exist and when they don't, and
1350                 // (2) what markup will make that actually happen.
1351                 $append = '';
1352                 $comment = preg_replace_callback(
1353                         // To detect the presence of content before or after the
1354                         // auto-comment, we use capturing groups inside optional zero-width
1355                         // assertions. But older versions of PCRE can't directly make
1356                         // zero-width assertions optional, so wrap them in a non-capturing
1357                         // group.
1358                         '!(?:(?<=(.)))?/\*\s*(.*?)\s*\*/(?:(?=(.)))?!',
1359                         function ( $match ) use ( $title, $local, $wikiId, &$append ) {
1360                                 global $wgLang;
1361
1362                                 // Ensure all match positions are defined
1363                                 $match += [ '', '', '', '' ];
1364
1365                                 $pre = $match[1] !== '';
1366                                 $auto = $match[2];
1367                                 $post = $match[3] !== '';
1368                                 $comment = null;
1369
1370                                 Hooks::run(
1371                                         'FormatAutocomments',
1372                                         [ &$comment, $pre, $auto, $post, $title, $local, $wikiId ]
1373                                 );
1374
1375                                 if ( $comment === null ) {
1376                                         $link = '';
1377                                         if ( $title ) {
1378                                                 $section = $auto;
1379                                                 # Remove links that a user may have manually put in the autosummary
1380                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1381                                                 $section = str_replace( '[[:', '', $section );
1382                                                 $section = str_replace( '[[', '', $section );
1383                                                 $section = str_replace( ']]', '', $section );
1384
1385                                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1386                                                 if ( $local ) {
1387                                                         $sectionTitle = Title::newFromText( '#' . $section );
1388                                                 } else {
1389                                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1390                                                                 $title->getDBkey(), $section );
1391                                                 }
1392                                                 if ( $sectionTitle ) {
1393                                                         $link = Linker::makeCommentLink( $sectionTitle, $wgLang->getArrow(), $wikiId, 'noclasses' );
1394                                                 } else {
1395                                                         $link = '';
1396                                                 }
1397                                         }
1398                                         if ( $pre ) {
1399                                                 # written summary $presep autocomment (summary /* section */)
1400                                                 $pre = wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1401                                         }
1402                                         if ( $post ) {
1403                                                 # autocomment $postsep written summary (/* section */ summary)
1404                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1405                                         }
1406                                         $auto = '<span class="autocomment">' . $auto . '</span>';
1407                                         $comment = $pre . $link . $wgLang->getDirMark()
1408                                                 . '<span dir="auto">' . $auto;
1409                                         $append .= '</span>';
1410                                 }
1411                                 return $comment;
1412                         },
1413                         $comment
1414                 );
1415                 return $comment . $append;
1416         }
1417
1418         /**
1419          * Formats wiki links and media links in text; all other wiki formatting
1420          * is ignored
1421          *
1422          * @since 1.16.3. $wikiId added in 1.26
1423          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1424          *
1425          * @param string $comment Text to format links in. WARNING! Since the output of this
1426          *      function is html, $comment must be sanitized for use as html. You probably want
1427          *      to pass $comment through Sanitizer::escapeHtmlAllowEntities() before calling
1428          *      this function.
1429          * @param Title|null $title An optional title object used to links to sections
1430          * @param bool $local Whether section links should refer to local page
1431          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1432          *  as used by WikiMap.
1433          *
1434          * @return string
1435          */
1436         public static function formatLinksInComment(
1437                 $comment, $title = null, $local = false, $wikiId = null
1438         ) {
1439                 return preg_replace_callback(
1440                         '/
1441                                 \[\[
1442                                 :? # ignore optional leading colon
1443                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1444                                 (?:\|
1445                                         # 2. a pipe-separated substring; only the last is captured
1446                                         # Stop matching at | and ]] without relying on backtracking.
1447                                         ((?:]?[^\]|])*+)
1448                                 )*
1449                                 \]\]
1450                                 ([^[]*) # 3. link trail (the text up until the next link)
1451                         /x',
1452                         function ( $match ) use ( $title, $local, $wikiId ) {
1453                                 global $wgContLang;
1454
1455                                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1456                                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1457
1458                                 $comment = $match[0];
1459
1460                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1461                                 if ( strpos( $match[1], '%' ) !== false ) {
1462                                         $match[1] = strtr(
1463                                                 rawurldecode( $match[1] ),
1464                                                 [ '<' => '&lt;', '>' => '&gt;' ]
1465                                         );
1466                                 }
1467
1468                                 # Handle link renaming [[foo|text]] will show link as "text"
1469                                 if ( $match[2] != "" ) {
1470                                         $text = $match[2];
1471                                 } else {
1472                                         $text = $match[1];
1473                                 }
1474                                 $submatch = [];
1475                                 $thelink = null;
1476                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1477                                         # Media link; trail not supported.
1478                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1479                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1480                                         if ( $title ) {
1481                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1482                                         }
1483                                 } else {
1484                                         # Other kind of link
1485                                         # Make sure its target is non-empty
1486                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1487                                                 $match[1] = substr( $match[1], 1 );
1488                                         }
1489                                         if ( $match[1] !== false && $match[1] !== '' ) {
1490                                                 if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
1491                                                         $trail = $submatch[1];
1492                                                 } else {
1493                                                         $trail = "";
1494                                                 }
1495                                                 $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1496                                                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1497
1498                                                 $linkText = $text;
1499                                                 $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1500
1501                                                 $target = Title::newFromText( $linkTarget );
1502                                                 if ( $target ) {
1503                                                         if ( $target->getText() == '' && !$target->isExternal()
1504                                                                 && !$local && $title
1505                                                         ) {
1506                                                                 $newTarget = clone $title;
1507                                                                 $newTarget->setFragment( '#' . $target->getFragment() );
1508                                                                 $target = $newTarget;
1509                                                         }
1510
1511                                                         $thelink = Linker::makeCommentLink( $target, $linkText . $inside, $wikiId ) . $trail;
1512                                                 }
1513                                         }
1514                                 }
1515                                 if ( $thelink ) {
1516                                         // If the link is still valid, go ahead and replace it in!
1517                                         $comment = preg_replace(
1518                                                 $linkRegexp,
1519                                                 StringUtils::escapeRegexReplacement( $thelink ),
1520                                                 $comment,
1521                                                 1
1522                                         );
1523                                 }
1524
1525                                 return $comment;
1526                         },
1527                         $comment
1528                 );
1529         }
1530
1531         /**
1532          * Generates a link to the given Title
1533          *
1534          * @note This is only public for technical reasons. It's not intended for use outside Linker.
1535          *
1536          * @param Title $title
1537          * @param string $text
1538          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1539          *  as used by WikiMap.
1540          * @param string|string[] $options See the $options parameter in Linker::link.
1541          *
1542          * @return string HTML link
1543          */
1544         public static function makeCommentLink(
1545                 Title $title, $text, $wikiId = null, $options = []
1546         ) {
1547                 if ( $wikiId !== null && !$title->isExternal() ) {
1548                         $link = Linker::makeExternalLink(
1549                                 WikiMap::getForeignURL(
1550                                         $wikiId,
1551                                         $title->getPrefixedText(),
1552                                         $title->getFragment()
1553                                 ),
1554                                 $text,
1555                                 /* escape = */ false // Already escaped
1556                         );
1557                 } else {
1558                         $link = Linker::link( $title, $text, [], [], $options );
1559                 }
1560
1561                 return $link;
1562         }
1563
1564         /**
1565          * @param Title $contextTitle
1566          * @param string $target
1567          * @param string $text
1568          * @return string
1569          */
1570         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1571                 # Valid link forms:
1572                 # Foobar -- normal
1573                 # :Foobar -- override special treatment of prefix (images, language links)
1574                 # /Foobar -- convert to CurrentPage/Foobar
1575                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial and final / from text
1576                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1577                 # ../Foobar -- convert to CurrentPage/Foobar,
1578                 #              (from CurrentPage/CurrentSubPage)
1579                 # ../Foobar/ -- convert to CurrentPage/Foobar, use 'Foobar' as text
1580                 #              (from CurrentPage/CurrentSubPage)
1581
1582                 $ret = $target; # default return value is no change
1583
1584                 # Some namespaces don't allow subpages,
1585                 # so only perform processing if subpages are allowed
1586                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1587                         $hash = strpos( $target, '#' );
1588                         if ( $hash !== false ) {
1589                                 $suffix = substr( $target, $hash );
1590                                 $target = substr( $target, 0, $hash );
1591                         } else {
1592                                 $suffix = '';
1593                         }
1594                         # bug 7425
1595                         $target = trim( $target );
1596                         # Look at the first character
1597                         if ( $target != '' && $target[0] === '/' ) {
1598                                 # / at end means we don't want the slash to be shown
1599                                 $m = [];
1600                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1601                                 if ( $trailingSlashes ) {
1602                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1603                                 } else {
1604                                         $noslash = substr( $target, 1 );
1605                                 }
1606
1607                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1608                                 if ( $text === '' ) {
1609                                         $text = $target . $suffix;
1610                                 } # this might be changed for ugliness reasons
1611                         } else {
1612                                 # check for .. subpage backlinks
1613                                 $dotdotcount = 0;
1614                                 $nodotdot = $target;
1615                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1616                                         ++$dotdotcount;
1617                                         $nodotdot = substr( $nodotdot, 3 );
1618                                 }
1619                                 if ( $dotdotcount > 0 ) {
1620                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1621                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1622                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1623                                                 # / at the end means don't show full path
1624                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1625                                                         $nodotdot = rtrim( $nodotdot, '/' );
1626                                                         if ( $text === '' ) {
1627                                                                 $text = $nodotdot . $suffix;
1628                                                         }
1629                                                 }
1630                                                 $nodotdot = trim( $nodotdot );
1631                                                 if ( $nodotdot != '' ) {
1632                                                         $ret .= '/' . $nodotdot;
1633                                                 }
1634                                                 $ret .= $suffix;
1635                                         }
1636                                 }
1637                         }
1638                 }
1639
1640                 return $ret;
1641         }
1642
1643         /**
1644          * Wrap a comment in standard punctuation and formatting if
1645          * it's non-empty, otherwise return empty string.
1646          *
1647          * @since 1.16.3. $wikiId added in 1.26
1648          * @param string $comment
1649          * @param Title|null $title Title object (to generate link to section in autocomment) or null
1650          * @param bool $local Whether section links should refer to local page
1651          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1652          *  For use with external changes.
1653          *
1654          * @return string
1655          */
1656         public static function commentBlock(
1657                 $comment, $title = null, $local = false, $wikiId = null
1658         ) {
1659                 // '*' used to be the comment inserted by the software way back
1660                 // in antiquity in case none was provided, here for backwards
1661                 // compatibility, acc. to brion -ævar
1662                 if ( $comment == '' || $comment == '*' ) {
1663                         return '';
1664                 } else {
1665                         $formatted = self::formatComment( $comment, $title, $local, $wikiId );
1666                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1667                         return " <span class=\"comment\">$formatted</span>";
1668                 }
1669         }
1670
1671         /**
1672          * Wrap and format the given revision's comment block, if the current
1673          * user is allowed to view it.
1674          *
1675          * @since 1.16.3
1676          * @param Revision $rev
1677          * @param bool $local Whether section links should refer to local page
1678          * @param bool $isPublic Show only if all users can see it
1679          * @return string HTML fragment
1680          */
1681         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1682                 if ( $rev->getComment( Revision::RAW ) == "" ) {
1683                         return "";
1684                 }
1685                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1686                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1687                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1688                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1689                                 $rev->getTitle(), $local );
1690                 } else {
1691                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1692                 }
1693                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1694                         return " <span class=\"history-deleted\">$block</span>";
1695                 }
1696                 return $block;
1697         }
1698
1699         /**
1700          * @since 1.16.3
1701          * @param int $size
1702          * @return string
1703          */
1704         public static function formatRevisionSize( $size ) {
1705                 if ( $size == 0 ) {
1706                         $stxt = wfMessage( 'historyempty' )->escaped();
1707                 } else {
1708                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1709                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1710                 }
1711                 return "<span class=\"history-size\">$stxt</span>";
1712         }
1713
1714         /**
1715          * Add another level to the Table of Contents
1716          *
1717          * @since 1.16.3
1718          * @return string
1719          */
1720         public static function tocIndent() {
1721                 return "\n<ul>";
1722         }
1723
1724         /**
1725          * Finish one or more sublevels on the Table of Contents
1726          *
1727          * @since 1.16.3
1728          * @param int $level
1729          * @return string
1730          */
1731         public static function tocUnindent( $level ) {
1732                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1733         }
1734
1735         /**
1736          * parameter level defines if we are on an indentation level
1737          *
1738          * @since 1.16.3
1739          * @param string $anchor
1740          * @param string $tocline
1741          * @param string $tocnumber
1742          * @param string $level
1743          * @param string|bool $sectionIndex
1744          * @return string
1745          */
1746         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1747                 $classes = "toclevel-$level";
1748                 if ( $sectionIndex !== false ) {
1749                         $classes .= " tocsection-$sectionIndex";
1750                 }
1751                 return "\n<li class=\"$classes\"><a href=\"#" .
1752                         $anchor . '"><span class="tocnumber">' .
1753                         $tocnumber . '</span> <span class="toctext">' .
1754                         $tocline . '</span></a>';
1755         }
1756
1757         /**
1758          * End a Table Of Contents line.
1759          * tocUnindent() will be used instead if we're ending a line below
1760          * the new level.
1761          * @since 1.16.3
1762          * @return string
1763          */
1764         public static function tocLineEnd() {
1765                 return "</li>\n";
1766         }
1767
1768         /**
1769          * Wraps the TOC in a table and provides the hide/collapse javascript.
1770          *
1771          * @since 1.16.3
1772          * @param string $toc Html of the Table Of Contents
1773          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1774          * @return string Full html of the TOC
1775          */
1776         public static function tocList( $toc, $lang = false ) {
1777                 $lang = wfGetLangObj( $lang );
1778                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1779
1780                 return '<div id="toc" class="toc">'
1781                         . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1782                         . $toc
1783                         . "</ul>\n</div>\n";
1784         }
1785
1786         /**
1787          * Generate a table of contents from a section tree.
1788          *
1789          * @since 1.16.3. $lang added in 1.17
1790          * @param array $tree Return value of ParserOutput::getSections()
1791          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1792          * @return string HTML fragment
1793          */
1794         public static function generateTOC( $tree, $lang = false ) {
1795                 $toc = '';
1796                 $lastLevel = 0;
1797                 foreach ( $tree as $section ) {
1798                         if ( $section['toclevel'] > $lastLevel ) {
1799                                 $toc .= self::tocIndent();
1800                         } elseif ( $section['toclevel'] < $lastLevel ) {
1801                                 $toc .= self::tocUnindent(
1802                                         $lastLevel - $section['toclevel'] );
1803                         } else {
1804                                 $toc .= self::tocLineEnd();
1805                         }
1806
1807                         $toc .= self::tocLine( $section['anchor'],
1808                                 $section['line'], $section['number'],
1809                                 $section['toclevel'], $section['index'] );
1810                         $lastLevel = $section['toclevel'];
1811                 }
1812                 $toc .= self::tocLineEnd();
1813                 return self::tocList( $toc, $lang );
1814         }
1815
1816         /**
1817          * Create a headline for content
1818          *
1819          * @since 1.16.3
1820          * @param int $level The level of the headline (1-6)
1821          * @param string $attribs Any attributes for the headline, starting with
1822          *   a space and ending with '>'
1823          *   This *must* be at least '>' for no attribs
1824          * @param string $anchor The anchor to give the headline (the bit after the #)
1825          * @param string $html Html for the text of the header
1826          * @param string $link HTML to add for the section edit link
1827          * @param bool|string $legacyAnchor A second, optional anchor to give for
1828          *   backward compatibility (false to omit)
1829          *
1830          * @return string HTML headline
1831          */
1832         public static function makeHeadline( $level, $attribs, $anchor, $html,
1833                 $link, $legacyAnchor = false
1834         ) {
1835                 $ret = "<h$level$attribs"
1836                         . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1837                         . $link
1838                         . "</h$level>";
1839                 if ( $legacyAnchor !== false ) {
1840                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1841                 }
1842                 return $ret;
1843         }
1844
1845         /**
1846          * Split a link trail, return the "inside" portion and the remainder of the trail
1847          * as a two-element array
1848          * @param string $trail
1849          * @return array
1850          */
1851         static function splitTrail( $trail ) {
1852                 global $wgContLang;
1853                 $regex = $wgContLang->linkTrail();
1854                 $inside = '';
1855                 if ( $trail !== '' ) {
1856                         $m = [];
1857                         if ( preg_match( $regex, $trail, $m ) ) {
1858                                 $inside = $m[1];
1859                                 $trail = $m[2];
1860                         }
1861                 }
1862                 return [ $inside, $trail ];
1863         }
1864
1865         /**
1866          * Generate a rollback link for a given revision.  Currently it's the
1867          * caller's responsibility to ensure that the revision is the top one. If
1868          * it's not, of course, the user will get an error message.
1869          *
1870          * If the calling page is called with the parameter &bot=1, all rollback
1871          * links also get that parameter. It causes the edit itself and the rollback
1872          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1873          * changes, so this allows sysops to combat a busy vandal without bothering
1874          * other users.
1875          *
1876          * If the option verify is set this function will return the link only in case the
1877          * revision can be reverted. Please note that due to performance limitations
1878          * it might be assumed that a user isn't the only contributor of a page while
1879          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1880          * work if $wgShowRollbackEditCount is disabled, so this can only function
1881          * as an additional check.
1882          *
1883          * If the option noBrackets is set the rollback link wont be enclosed in []
1884          *
1885          * @since 1.16.3. $context added in 1.20. $options added in 1.21
1886          *
1887          * @param Revision $rev
1888          * @param IContextSource $context Context to use or null for the main context.
1889          * @param array $options
1890          * @return string
1891          */
1892         public static function generateRollback( $rev, IContextSource $context = null,
1893                 $options = [ 'verify' ]
1894         ) {
1895                 if ( $context === null ) {
1896                         $context = RequestContext::getMain();
1897                 }
1898
1899                 $editCount = false;
1900                 if ( in_array( 'verify', $options, true ) ) {
1901                         $editCount = self::getRollbackEditCount( $rev, true );
1902                         if ( $editCount === false ) {
1903                                 return '';
1904                         }
1905                 }
1906
1907                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1908
1909                 if ( !in_array( 'noBrackets', $options, true ) ) {
1910                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->escaped();
1911                 }
1912
1913                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1914         }
1915
1916         /**
1917          * This function will return the number of revisions which a rollback
1918          * would revert and, if $verify is set it will verify that a revision
1919          * can be reverted (that the user isn't the only contributor and the
1920          * revision we might rollback to isn't deleted). These checks can only
1921          * function as an additional check as this function only checks against
1922          * the last $wgShowRollbackEditCount edits.
1923          *
1924          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1925          * is set and the user is the only contributor of the page.
1926          *
1927          * @param Revision $rev
1928          * @param bool $verify Try to verify that this revision can really be rolled back
1929          * @return int|bool|null
1930          */
1931         public static function getRollbackEditCount( $rev, $verify ) {
1932                 global $wgShowRollbackEditCount;
1933                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1934                         // Nothing has happened, indicate this by returning 'null'
1935                         return null;
1936                 }
1937
1938                 $dbr = wfGetDB( DB_SLAVE );
1939
1940                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1941                 $res = $dbr->select(
1942                         'revision',
1943                         [ 'rev_user_text', 'rev_deleted' ],
1944                         // $rev->getPage() returns null sometimes
1945                         [ 'rev_page' => $rev->getTitle()->getArticleID() ],
1946                         __METHOD__,
1947                         [
1948                                 'USE INDEX' => [ 'revision' => 'page_timestamp' ],
1949                                 'ORDER BY' => 'rev_timestamp DESC',
1950                                 'LIMIT' => $wgShowRollbackEditCount + 1
1951                         ]
1952                 );
1953
1954                 $editCount = 0;
1955                 $moreRevs = false;
1956                 foreach ( $res as $row ) {
1957                         if ( $rev->getUserText( Revision::RAW ) != $row->rev_user_text ) {
1958                                 if ( $verify &&
1959                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1960                                                 || $row->rev_deleted & Revision::DELETED_USER
1961                                 ) ) {
1962                                         // If the user or the text of the revision we might rollback
1963                                         // to is deleted in some way we can't rollback. Similar to
1964                                         // the sanity checks in WikiPage::commitRollback.
1965                                         return false;
1966                                 }
1967                                 $moreRevs = true;
1968                                 break;
1969                         }
1970                         $editCount++;
1971                 }
1972
1973                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1974                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1975                         // and there weren't any other revisions. That means that the current user is the only
1976                         // editor, so we can't rollback
1977                         return false;
1978                 }
1979                 return $editCount;
1980         }
1981
1982         /**
1983          * Build a raw rollback link, useful for collections of "tool" links
1984          *
1985          * @since 1.16.3. $context added in 1.20. $editCount added in 1.21
1986          * @param Revision $rev
1987          * @param IContextSource|null $context Context to use or null for the main context.
1988          * @param int $editCount Number of edits that would be reverted
1989          * @return string HTML fragment
1990          */
1991         public static function buildRollbackLink( $rev, IContextSource $context = null,
1992                 $editCount = false
1993         ) {
1994                 global $wgShowRollbackEditCount, $wgMiserMode;
1995
1996                 // To config which pages are affected by miser mode
1997                 $disableRollbackEditCountSpecialPage = [ 'Recentchanges', 'Watchlist' ];
1998
1999                 if ( $context === null ) {
2000                         $context = RequestContext::getMain();
2001                 }
2002
2003                 $title = $rev->getTitle();
2004                 $query = [
2005                         'action' => 'rollback',
2006                         'from' => $rev->getUserText(),
2007                         'token' => $context->getUser()->getEditToken( [
2008                                 $title->getPrefixedText(),
2009                                 $rev->getUserText()
2010                         ] ),
2011                 ];
2012                 if ( $context->getRequest()->getBool( 'bot' ) ) {
2013                         $query['bot'] = '1';
2014                         $query['hidediff'] = '1'; // bug 15999
2015                 }
2016
2017                 $disableRollbackEditCount = false;
2018                 if ( $wgMiserMode ) {
2019                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
2020                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
2021                                         $disableRollbackEditCount = true;
2022                                         break;
2023                                 }
2024                         }
2025                 }
2026
2027                 if ( !$disableRollbackEditCount
2028                         && is_int( $wgShowRollbackEditCount )
2029                         && $wgShowRollbackEditCount > 0
2030                 ) {
2031                         if ( !is_numeric( $editCount ) ) {
2032                                 $editCount = self::getRollbackEditCount( $rev, false );
2033                         }
2034
2035                         if ( $editCount > $wgShowRollbackEditCount ) {
2036                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
2037                                         ->numParams( $wgShowRollbackEditCount )->parse();
2038                         } else {
2039                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
2040                         }
2041
2042                         return self::link(
2043                                 $title,
2044                                 $editCount_output,
2045                                 [ 'title' => $context->msg( 'tooltip-rollback' )->text() ],
2046                                 $query,
2047                                 [ 'known', 'noclasses' ]
2048                         );
2049                 } else {
2050                         return self::link(
2051                                 $title,
2052                                 $context->msg( 'rollbacklink' )->escaped(),
2053                                 [ 'title' => $context->msg( 'tooltip-rollback' )->text() ],
2054                                 $query,
2055                                 [ 'known', 'noclasses' ]
2056                         );
2057                 }
2058         }
2059
2060         /**
2061          * Returns HTML for the "templates used on this page" list.
2062          *
2063          * Make an HTML list of templates, and then add a "More..." link at
2064          * the bottom. If $more is null, do not add a "More..." link. If $more
2065          * is a Title, make a link to that title and use it. If $more is a string,
2066          * directly paste it in as the link (escaping needs to be done manually).
2067          * Finally, if $more is a Message, call toString().
2068          *
2069          * @since 1.16.3. $more added in 1.21
2070          * @param Title[] $templates Array of templates
2071          * @param bool $preview Whether this is for a preview
2072          * @param bool $section Whether this is for a section edit
2073          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
2074          * @return string HTML output
2075          */
2076         public static function formatTemplates( $templates, $preview = false,
2077                 $section = false, $more = null
2078         ) {
2079                 global $wgLang;
2080
2081                 $outText = '';
2082                 if ( count( $templates ) > 0 ) {
2083                         # Do a batch existence check
2084                         $batch = new LinkBatch;
2085                         foreach ( $templates as $title ) {
2086                                 $batch->addObj( $title );
2087                         }
2088                         $batch->execute();
2089
2090                         # Construct the HTML
2091                         $outText = '<div class="mw-templatesUsedExplanation">';
2092                         if ( $preview ) {
2093                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
2094                                         ->parseAsBlock();
2095                         } elseif ( $section ) {
2096                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
2097                                         ->parseAsBlock();
2098                         } else {
2099                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
2100                                         ->parseAsBlock();
2101                         }
2102                         $outText .= "</div><ul>\n";
2103
2104                         usort( $templates, 'Title::compare' );
2105                         foreach ( $templates as $titleObj ) {
2106                                 $protected = '';
2107                                 $restrictions = $titleObj->getRestrictions( 'edit' );
2108                                 if ( $restrictions ) {
2109                                         // Check backwards-compatible messages
2110                                         $msg = null;
2111                                         if ( $restrictions === [ 'sysop' ] ) {
2112                                                 $msg = wfMessage( 'template-protected' );
2113                                         } elseif ( $restrictions === [ 'autoconfirmed' ] ) {
2114                                                 $msg = wfMessage( 'template-semiprotected' );
2115                                         }
2116                                         if ( $msg && !$msg->isDisabled() ) {
2117                                                 $protected = $msg->parse();
2118                                         } else {
2119                                                 // Construct the message from restriction-level-*
2120                                                 // e.g. restriction-level-sysop, restriction-level-autoconfirmed
2121                                                 $msgs = [];
2122                                                 foreach ( $restrictions as $r ) {
2123                                                         $msgs[] = wfMessage( "restriction-level-$r" )->parse();
2124                                                 }
2125                                                 $protected = wfMessage( 'parentheses' )
2126                                                         ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
2127                                         }
2128                                 }
2129                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
2130                                         $editLink = self::link(
2131                                                 $titleObj,
2132                                                 wfMessage( 'editlink' )->escaped(),
2133                                                 [],
2134                                                 [ 'action' => 'edit' ]
2135                                         );
2136                                 } else {
2137                                         $editLink = self::link(
2138                                                 $titleObj,
2139                                                 wfMessage( 'viewsourcelink' )->escaped(),
2140                                                 [],
2141                                                 [ 'action' => 'edit' ]
2142                                         );
2143                                 }
2144                                 $outText .= '<li>' . self::link( $titleObj )
2145                                         . wfMessage( 'word-separator' )->escaped()
2146                                         . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
2147                                         . wfMessage( 'word-separator' )->escaped()
2148                                         . $protected . '</li>';
2149                         }
2150
2151                         if ( $more instanceof Title ) {
2152                                 $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
2153                         } elseif ( $more ) {
2154                                 $outText .= "<li>$more</li>";
2155                         }
2156
2157                         $outText .= '</ul>';
2158                 }
2159                 return $outText;
2160         }
2161
2162         /**
2163          * Returns HTML for the "hidden categories on this page" list.
2164          *
2165          * @since 1.16.3
2166          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
2167          *   or similar
2168          * @return string HTML output
2169          */
2170         public static function formatHiddenCategories( $hiddencats ) {
2171
2172                 $outText = '';
2173                 if ( count( $hiddencats ) > 0 ) {
2174                         # Construct the HTML
2175                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
2176                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
2177                         $outText .= "</div><ul>\n";
2178
2179                         foreach ( $hiddencats as $titleObj ) {
2180                                 # If it's hidden, it must exist - no need to check with a LinkBatch
2181                                 $outText .= '<li>'
2182                                         . self::link( $titleObj, null, [], [], 'known' )
2183                                         . "</li>\n";
2184                         }
2185                         $outText .= '</ul>';
2186                 }
2187                 return $outText;
2188         }
2189
2190         /**
2191          * Format a size in bytes for output, using an appropriate
2192          * unit (B, KB, MB or GB) according to the magnitude in question
2193          *
2194          * @since 1.16.3
2195          * @param int $size Size to format
2196          * @return string
2197          */
2198         public static function formatSize( $size ) {
2199                 global $wgLang;
2200                 return htmlspecialchars( $wgLang->formatSize( $size ) );
2201         }
2202
2203         /**
2204          * Given the id of an interface element, constructs the appropriate title
2205          * attribute from the system messages.  (Note, this is usually the id but
2206          * isn't always, because sometimes the accesskey needs to go on a different
2207          * element than the id, for reverse-compatibility, etc.)
2208          *
2209          * @since 1.16.3 $msgParams added in 1.27
2210          * @param string $name Id of the element, minus prefixes.
2211          * @param string|null $options Null or the string 'withaccess' to add an access-
2212          *   key hint
2213          * @param array $msgParams Parameters to pass to the message
2214          *
2215          * @return string Contents of the title attribute (which you must HTML-
2216          *   escape), or false for no title attribute
2217          */
2218         public static function titleAttrib( $name, $options = null, array $msgParams = [] ) {
2219                 $message = wfMessage( "tooltip-$name", $msgParams );
2220                 if ( !$message->exists() ) {
2221                         $tooltip = false;
2222                 } else {
2223                         $tooltip = $message->text();
2224                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2225                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2226                         # Message equal to '-' means suppress it.
2227                         if ( $tooltip == '-' ) {
2228                                 $tooltip = false;
2229                         }
2230                 }
2231
2232                 if ( $options == 'withaccess' ) {
2233                         $accesskey = self::accesskey( $name );
2234                         if ( $accesskey !== false ) {
2235                                 // Should be build the same as in jquery.accessKeyLabel.js
2236                                 if ( $tooltip === false || $tooltip === '' ) {
2237                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2238                                 } else {
2239                                         $tooltip .= wfMessage( 'word-separator' )->text();
2240                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2241                                 }
2242                         }
2243                 }
2244
2245                 return $tooltip;
2246         }
2247
2248         public static $accesskeycache;
2249
2250         /**
2251          * Given the id of an interface element, constructs the appropriate
2252          * accesskey attribute from the system messages.  (Note, this is usually
2253          * the id but isn't always, because sometimes the accesskey needs to go on
2254          * a different element than the id, for reverse-compatibility, etc.)
2255          *
2256          * @since 1.16.3
2257          * @param string $name Id of the element, minus prefixes.
2258          * @return string Contents of the accesskey attribute (which you must HTML-
2259          *   escape), or false for no accesskey attribute
2260          */
2261         public static function accesskey( $name ) {
2262                 if ( isset( self::$accesskeycache[$name] ) ) {
2263                         return self::$accesskeycache[$name];
2264                 }
2265
2266                 $message = wfMessage( "accesskey-$name" );
2267
2268                 if ( !$message->exists() ) {
2269                         $accesskey = false;
2270                 } else {
2271                         $accesskey = $message->plain();
2272                         if ( $accesskey === '' || $accesskey === '-' ) {
2273                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2274                                 # attribute, but this is broken for accesskey: that might be a useful
2275                                 # value.
2276                                 $accesskey = false;
2277                         }
2278                 }
2279
2280                 self::$accesskeycache[$name] = $accesskey;
2281                 return self::$accesskeycache[$name];
2282         }
2283
2284         /**
2285          * Get a revision-deletion link, or disabled link, or nothing, depending
2286          * on user permissions & the settings on the revision.
2287          *
2288          * Will use forward-compatible revision ID in the Special:RevDelete link
2289          * if possible, otherwise the timestamp-based ID which may break after
2290          * undeletion.
2291          *
2292          * @param User $user
2293          * @param Revision $rev
2294          * @param Title $title
2295          * @return string HTML fragment
2296          */
2297         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2298                 $canHide = $user->isAllowed( 'deleterevision' );
2299                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2300                         return '';
2301                 }
2302
2303                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2304                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2305                 } else {
2306                         if ( $rev->getId() ) {
2307                                 // RevDelete links using revision ID are stable across
2308                                 // page deletion and undeletion; use when possible.
2309                                 $query = [
2310                                         'type' => 'revision',
2311                                         'target' => $title->getPrefixedDBkey(),
2312                                         'ids' => $rev->getId()
2313                                 ];
2314                         } else {
2315                                 // Older deleted entries didn't save a revision ID.
2316                                 // We have to refer to these by timestamp, ick!
2317                                 $query = [
2318                                         'type' => 'archive',
2319                                         'target' => $title->getPrefixedDBkey(),
2320                                         'ids' => $rev->getTimestamp()
2321                                 ];
2322                         }
2323                         return Linker::revDeleteLink( $query,
2324                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2325                 }
2326         }
2327
2328         /**
2329          * Creates a (show/hide) link for deleting revisions/log entries
2330          *
2331          * @param array $query Query parameters to be passed to link()
2332          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2333          * @param bool $delete Set to true to use (show/hide) rather than (show)
2334          *
2335          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2336          * span to allow for customization of appearance with CSS
2337          */
2338         public static function revDeleteLink( $query = [], $restricted = false, $delete = true ) {
2339                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2340                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2341                 $html = wfMessage( $msgKey )->escaped();
2342                 $tag = $restricted ? 'strong' : 'span';
2343                 $link = self::link( $sp, $html, [], $query, [ 'known', 'noclasses' ] );
2344                 return Xml::tags(
2345                         $tag,
2346                         [ 'class' => 'mw-revdelundel-link' ],
2347                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2348                 );
2349         }
2350
2351         /**
2352          * Creates a dead (show/hide) link for deleting revisions/log entries
2353          *
2354          * @since 1.16.3
2355          * @param bool $delete Set to true to use (show/hide) rather than (show)
2356          *
2357          * @return string HTML text wrapped in a span to allow for customization
2358          * of appearance with CSS
2359          */
2360         public static function revDeleteLinkDisabled( $delete = true ) {
2361                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2362                 $html = wfMessage( $msgKey )->escaped();
2363                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2364                 return Xml::tags( 'span', [ 'class' => 'mw-revdelundel-link' ], $htmlParentheses );
2365         }
2366
2367         /* Deprecated methods */
2368
2369         /**
2370          * Returns the attributes for the tooltip and access key.
2371          *
2372          * @since 1.16.3. $msgParams introduced in 1.27
2373          * @param string $name
2374          * @param array $msgParams Params for constructing the message
2375          *
2376          * @return array
2377          */
2378         public static function tooltipAndAccesskeyAttribs( $name, array $msgParams = [] ) {
2379                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2380                 # no attribute" instead of "output '' as value for attribute", this
2381                 # would be three lines.
2382                 $attribs = [
2383                         'title' => self::titleAttrib( $name, 'withaccess', $msgParams ),
2384                         'accesskey' => self::accesskey( $name )
2385                 ];
2386                 if ( $attribs['title'] === false ) {
2387                         unset( $attribs['title'] );
2388                 }
2389                 if ( $attribs['accesskey'] === false ) {
2390                         unset( $attribs['accesskey'] );
2391                 }
2392                 return $attribs;
2393         }
2394
2395         /**
2396          * Returns raw bits of HTML, use titleAttrib()
2397          * @since 1.16.3
2398          * @param string $name
2399          * @param array|null $options
2400          * @return null|string
2401          */
2402         public static function tooltip( $name, $options = null ) {
2403                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2404                 # no attribute" instead of "output '' as value for attribute", this
2405                 # would be two lines.
2406                 $tooltip = self::titleAttrib( $name, $options );
2407                 if ( $tooltip === false ) {
2408                         return '';
2409                 }
2410                 return Xml::expandAttributes( [
2411                         'title' => $tooltip
2412                 ] );
2413         }
2414
2415 }
2416