includes/Linker.php

   1 <?php
   2 /**
   3  * Some internal bits split of from Skin.php. These functions are used
   4  * for primarily page content: links, embedded images, table of contents. Links
   5  * are also used in the skin.
   6  *
   7  * @ingroup Skins
   8  */
   9 class Linker {
  10
  11         /**
  12          * Flags for userToolLinks()
  13          */
  14         const TOOL_LINKS_NOBLOCK = 1;
  15         const TOOL_LINKS_EMAIL   = 2;
  16
  17         /**
  18          * Get the appropriate HTML attributes to add to the "a" element of an ex-
  19          * ternal link, as created by [wikisyntax].
  20          *
  21          * @param $class String: the contents of the class attribute; if an empty
  22          *   string is passed, which is the default value, defaults to 'external'.
  23          * @deprecated since 1.18 Just pass the external class directly to something using Html::expandAttributes
  24          */
  25         static function getExternalLinkAttributes( $class = 'external' ) {
  26                 wfDeprecated( __METHOD__, '1.18' );
  27                 return self::getLinkAttributesInternal( '', $class );
  28         }
  29
  30         /**
  31          * Get the appropriate HTML attributes to add to the "a" element of an in-
  32          * terwiki link.
  33          *
  34          * @param $title String: the title text for the link, URL-encoded (???) but
  35          *   not HTML-escaped
  36          * @param $unused String: unused
  37          * @param $class String: the contents of the class attribute; if an empty
  38          *   string is passed, which is the default value, defaults to 'external'.
  39          */
  40         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  41                 global $wgContLang;
  42
  43                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  44                 # getExternalLinkAttributes, why?
  45                 $title = urldecode( $title );
  46                 $title = $wgContLang->checkTitleEncoding( $title );
  47                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  48
  49                 return self::getLinkAttributesInternal( $title, $class );
  50         }
  51
  52         /**
  53          * Get the appropriate HTML attributes to add to the "a" element of an in-
  54          * ternal link.
  55          *
  56          * @param $title String: the title text for the link, URL-encoded (???) but
  57          *   not HTML-escaped
  58          * @param $unused String: unused
  59          * @param $class String: the contents of the class attribute, default none
  60          */
  61         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  62                 $title = urldecode( $title );
  63                 $title = str_replace( '_', ' ', $title );
  64                 return self::getLinkAttributesInternal( $title, $class );
  65         }
  66
  67         /**
  68          * Get the appropriate HTML attributes to add to the "a" element of an in-
  69          * ternal link, given the Title object for the page we want to link to.
  70          *
  71          * @param $nt Title
  72          * @param $unused String: unused
  73          * @param $class String: the contents of the class attribute, default none
  74          * @param $title Mixed: optional (unescaped) string to use in the title
  75          *   attribute; if false, default to the name of the page we're linking to
  76          */
  77         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
  78                 if ( $title === false ) {
  79                         $title = $nt->getPrefixedText();
  80                 }
  81                 return self::getLinkAttributesInternal( $title, $class );
  82         }
  83
  84         /**
  85          * Common code for getLinkAttributesX functions
  86          *
  87          * @param $title string
  88          * @param $class string
  89          *
  90          * @return string
  91          */
  92         private static function getLinkAttributesInternal( $title, $class ) {
  93                 $title = htmlspecialchars( $title );
  94                 $class = htmlspecialchars( $class );
  95                 $r = '';
  96                 if ( $class != '' ) {
  97                         $r .= " class=\"$class\"";
  98                 }
  99                 if ( $title != '' ) {
 100                         $r .= " title=\"$title\"";
 101                 }
 102                 return $r;
 103         }
 104
 105         /**
 106          * Return the CSS colour of a known link
 107          *
 108          * @param $t Title object
 109          * @param $threshold Integer: user defined threshold
 110          * @return String: CSS class
 111          */
 112         public static function getLinkColour( $t, $threshold ) {
 113                 $colour = '';
 114                 if ( $t->isRedirect() ) {
 115                         # Page is a redirect
 116                         $colour = 'mw-redirect';
 117                 } elseif ( $threshold > 0 &&
 118                            $t->exists() && $t->getLength() < $threshold &&
 119                            $t->isContentPage() ) {
 120                         # Page is a stub
 121                         $colour = 'stub';
 122                 }
 123                 return $colour;
 124         }
 125
 126         /**
 127          * This function returns an HTML link to the given target.  It serves a few
 128          * purposes:
 129          *   1) If $target is a Title, the correct URL to link to will be figured
 130          *      out automatically.
 131          *   2) It automatically adds the usual classes for various types of link
 132          *      targets: "new" for red links, "stub" for short articles, etc.
 133          *   3) It escapes all attribute values safely so there's no risk of XSS.
 134          *   4) It provides a default tooltip if the target is a Title (the page
 135          *      name of the target).
 136          * link() replaces the old functions in the makeLink() family.
 137          *
 138          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 139          * You can call it using this if you want to keep compat with these:
 140          * $linker = class_exists( 'DummyLinker' ) ? new DummyLinker() : new Linker();
 141          * $linker->link( ... );
 142          *
 143          * @param $target        Title  Can currently only be a Title, but this may
 144          *   change to support Images, literal URLs, etc.
 145          * @param $html          string The HTML contents of the <a> element, i.e.,
 146          *   the link text.  This is raw HTML and will not be escaped.  If null,
 147          *   defaults to the prefixed text of the Title; or if the Title is just a
 148          *   fragment, the contents of the fragment.
 149          * @param $customAttribs array  A key => value array of extra HTML attri-
 150          *   butes, such as title and class.  (href is ignored.)  Classes will be
 151          *   merged with the default classes, while other attributes will replace
 152          *   default attributes.  All passed attribute values will be HTML-escaped.
 153          *   A false attribute value means to suppress that attribute.
 154          * @param $query         array  The query string to append to the URL
 155          *   you're linking to, in key => value array form.  Query keys and values
 156          *   will be URL-encoded.
 157          * @param $options string|array  String or array:
 158          *   - Either with numerical index and following values:
 159          *     - 'known': Page is known to exist, so don't check if it does.
 160          *     - 'broken': Page is known not to exist, so don't check if it does.
 161          *     - 'noclasses': Don't add any classes automatically (includes "new",
 162          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
 163          *       provided, if any, so you get a simple blue link with no funny i-
 164          *       cons.
 165          *     - 'forcearticlepath': Use the article path always, even with a querystring.
 166          *       Has compatibility issues on some setups, so avoid wherever possible.
 167          *   - Or with following indexes:
 168          *     - 'language': the value of that index is the language to use; currently
 169          *       only used for the tooltip when linking to a page that doesn't exist
 170          *       (since 1.19)
 171          * @return string HTML <a> attribute
 172          */
 173         public static function link(
 174                 $target, $html = null, $customAttribs = array(), $query = array(), $options = array()
 175         ) {
 176                 wfProfileIn( __METHOD__ );
 177                 if ( !$target instanceof Title ) {
 178                         wfProfileOut( __METHOD__ );
 179                         return "<!-- ERROR -->$html";
 180                 }
 181                 $options = (array)$options;
 182
 183                 $dummy = new DummyLinker; // dummy linker instance for bc on the hooks
 184
 185                 $ret = null;
 186                 if ( !wfRunHooks( 'LinkBegin', array( $dummy, $target, &$html,
 187                 &$customAttribs, &$query, &$options, &$ret ) ) ) {
 188                         wfProfileOut( __METHOD__ );
 189                         return $ret;
 190                 }
 191
 192                 # Normalize the Title if it's a special page
 193                 $target = self::normaliseSpecialPage( $target );
 194
 195                 # If we don't know whether the page exists, let's find out.
 196                 wfProfileIn( __METHOD__ . '-checkPageExistence' );
 197                 if ( !in_array( 'known', $options, true ) && !in_array( 'broken', $options, true ) ) {
 198                         if ( $target->isKnown() ) {
 199                                 $options[] = 'known';
 200                         } else {
 201                                 $options[] = 'broken';
 202                         }
 203                 }
 204                 wfProfileOut( __METHOD__ . '-checkPageExistence' );
 205
 206                 $oldquery = array();
 207                 if ( in_array( 'forcearticlepath', $options, true ) && $query ) {
 208                         $oldquery = $query;
 209                         $query = array();
 210                 }
 211
 212                 # Note: we want the href attribute first, for prettiness.
 213                 $attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
 214                 if ( in_array( 'forcearticlepath', $options, true ) && $oldquery ) {
 215                         $attribs['href'] = wfAppendQuery( $attribs['href'], wfArrayToCgi( $oldquery ) );
 216                 }
 217
 218                 $attribs = array_merge(
 219                         $attribs,
 220                         self::linkAttribs( $target, $customAttribs, $options )
 221                 );
 222                 if ( is_null( $html ) ) {
 223                         $html = self::linkText( $target );
 224                 }
 225
 226                 $ret = null;
 227                 if ( wfRunHooks( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
 228                         $ret = Html::rawElement( 'a', $attribs, $html );
 229                 }
 230
 231                 wfProfileOut( __METHOD__ );
 232                 return $ret;
 233         }
 234
 235         /**
 236          * Identical to link(), except $options defaults to 'known'.
 237          */
 238         public static function linkKnown(
 239                 $target, $html = null, $customAttribs = array(),
 240                 $query = array(), $options = array( 'known', 'noclasses' ) )
 241         {
 242                 return self::link( $target, $html, $customAttribs, $query, $options );
 243         }
 244
 245         /**
 246          * Returns the Url used to link to a Title
 247          *
 248          * @param $target Title
 249          */
 250         private static function linkUrl( $target, $query, $options ) {
 251                 wfProfileIn( __METHOD__ );
 252                 # We don't want to include fragments for broken links, because they
 253                 # generally make no sense.
 254                 if ( in_array( 'broken', $options, true ) && $target->mFragment !== '' ) {
 255                         $target = clone $target;
 256                         $target->mFragment = '';
 257                 }
 258
 259                 # If it's a broken link, add the appropriate query pieces, unless
 260                 # there's already an action specified, or unless 'edit' makes no sense
 261                 # (i.e., for a nonexistent special page).
 262                 if ( in_array( 'broken', $options, true ) && empty( $query['action'] )
 263                         && !$target->isSpecialPage() ) {
 264                         $query['action'] = 'edit';
 265                         $query['redlink'] = '1';
 266                 }
 267                 $ret = $target->getLinkURL( $query );
 268                 wfProfileOut( __METHOD__ );
 269                 return $ret;
 270         }
 271
 272         /**
 273          * Returns the array of attributes used when linking to the Title $target
 274          *
 275          * @param $target Title
 276          * @param $attribs
 277          * @param $options
 278          *
 279          * @return array
 280          */
 281         private static function linkAttribs( $target, $attribs, $options ) {
 282                 global $wgUser;
 283
 284                 wfProfileIn( __METHOD__ );
 285
 286                 $defaults = array();
 287
 288                 if ( !in_array( 'noclasses', $options, true ) ) {
 289                         wfProfileIn( __METHOD__ . '-getClasses' );
 290                         # Now build the classes.
 291                         $classes = array();
 292
 293                         if ( $target->isExternal() ) {
 294                                 $classes[] = 'extiw';
 295                         } elseif ( in_array( 'broken', $options, true ) ) {
 296                                 $classes[] = 'new';
 297                         } else { # Avoid useless calls to LinkCache (see r50387)
 298                                 $colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
 299                                 if ( $colour !== '' ) {
 300                                         $classes[] = $colour; # mw-redirect or stub
 301                                 }
 302                         }
 303                         if ( $classes != array() ) {
 304                                 $defaults['class'] = implode( ' ', $classes );
 305                         }
 306                         wfProfileOut( __METHOD__ . '-getClasses' );
 307                 }
 308
 309                 # Get a default title attribute.
 310                 if ( $target->getPrefixedText() == '' ) {
 311                         # A link like [[#Foo]].  This used to mean an empty title
 312                         # attribute, but that's silly.  Just don't output a title.
 313                 } elseif ( in_array( 'known', $options, true ) ) {
 314                         $defaults['title'] = $target->getPrefixedText();
 315                 } else {
 316                         $msg = wfMessage( 'red-link-title', $target->getPrefixedText() );
 317                         if ( isset( $options['language'] ) ) {
 318                                 $msg->inLanguage( $options['language'] );
 319                         }
 320                         $defaults['title'] = $msg->text();
 321                 }
 322
 323                 # Finally, merge the custom attribs with the default ones, and iterate
 324                 # over that, deleting all "false" attributes.
 325                 $ret = array();
 326                 $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
 327                 foreach ( $merged as $key => $val ) {
 328                         # A false value suppresses the attribute, and we don't want the
 329                         # href attribute to be overridden.
 330                         if ( $key != 'href' and $val !== false ) {
 331                                 $ret[$key] = $val;
 332                         }
 333                 }
 334                 wfProfileOut( __METHOD__ );
 335                 return $ret;
 336         }
 337
 338         /**
 339          * Default text of the links to the Title $target
 340          *
 341          * @param $target Title
 342          *
 343          * @return string
 344          */
 345         private static function linkText( $target ) {
 346                 # We might be passed a non-Title by make*LinkObj().  Fail gracefully.
 347                 if ( !$target instanceof Title ) {
 348                         return '';
 349                 }
 350
 351                 # If the target is just a fragment, with no title, we return the frag-
 352                 # ment text.  Otherwise, we return the title text itself.
 353                 if ( $target->getPrefixedText() === '' && $target->getFragment() !== '' ) {
 354                         return htmlspecialchars( $target->getFragment() );
 355                 }
 356                 return htmlspecialchars( $target->getPrefixedText() );
 357         }
 358
 359         /**
 360          * Generate either a normal exists-style link or a stub link, depending
 361          * on the given page size.
 362          *
 363          * @param $size Integer
 364          * @param $nt Title object.
 365          * @param $text String
 366          * @param $query String
 367          * @param $trail String
 368          * @param $prefix String
 369          * @return string HTML of link
 370          * @deprecated since 1.17
 371          */
 372         static function makeSizeLinkObj( $size, $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
 373                 global $wgUser;
 374                 wfDeprecated( __METHOD__, '1.17' );
 375
 376                 $threshold = $wgUser->getStubThreshold();
 377                 $colour = ( $size < $threshold ) ? 'stub' : '';
 378                 // @todo FIXME: Replace deprecated makeColouredLinkObj by link()
 379                 return self::makeColouredLinkObj( $nt, $colour, $text, $query, $trail, $prefix );
 380         }
 381
 382         /**
 383          * Make appropriate markup for a link to the current article. This is currently rendered
 384          * as the bold link text. The calling sequence is the same as the other make*LinkObj static functions,
 385          * despite $query not being used.
 386          *
 387          * @param $nt Title
 388          *
 389          * @return string
 390          */
 391         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 392                 if ( $html == '' ) {
 393                         $html = htmlspecialchars( $nt->getPrefixedText() );
 394                 }
 395                 list( $inside, $trail ) = self::splitTrail( $trail );
 396                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 397         }
 398
 399         /**
 400          * @param $title Title
 401          * @return Title
 402          */
 403         static function normaliseSpecialPage( Title $title ) {
 404                 if ( $title->isSpecialPage() ) {
 405                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 406                         if ( !$name ) {
 407                                 return $title;
 408                         }
 409                         $ret = SpecialPage::getTitleFor( $name, $subpage );
 410                         $ret->mFragment = $title->getFragment();
 411                         return $ret;
 412                 } else {
 413                         return $title;
 414                 }
 415         }
 416
 417         /**
 418          * Returns the filename part of an url.
 419          * Used as alternative text for external images.
 420          *
 421          * @param $url string
 422          *
 423          * @return string
 424          */
 425         private static function fnamePart( $url ) {
 426                 $basename = strrchr( $url, '/' );
 427                 if ( false === $basename ) {
 428                         $basename = $url;
 429                 } else {
 430                         $basename = substr( $basename, 1 );
 431                 }
 432                 return $basename;
 433         }
 434
 435         /**
 436          * Return the code for images which were added via external links,
 437          * via Parser::maybeMakeExternalImage().
 438          *
 439          * @param $url
 440          * @param $alt
 441          *
 442          * @return string
 443          */
 444         public static function makeExternalImage( $url, $alt = '' ) {
 445                 if ( $alt == '' ) {
 446                         $alt = self::fnamePart( $url );
 447                 }
 448                 $img = '';
 449                 $success = wfRunHooks( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
 450                 if ( !$success ) {
 451                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image with url {$url} and alt text {$alt} to {$img}\n", true );
 452                         return $img;
 453                 }
 454                 return Html::element( 'img',
 455                         array(
 456                                 'src' => $url,
 457                                 'alt' => $alt ) );
 458         }
 459
 460         /**
 461          * Given parameters derived from [[Image:Foo|options...]], generate the
 462          * HTML that that syntax inserts in the page.
 463          *
 464          * @param $title Title object
 465          * @param $file File object, or false if it doesn't exist
 466          * @param $frameParams Array: associative array of parameters external to the media handler.
 467          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 468          *     will often be false.
 469          *          thumbnail       If present, downscale and frame
 470          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 471          *          framed          Shows image in original size in a frame
 472          *          frameless       Downscale but don't frame
 473          *          upright         If present, tweak default sizes for portrait orientation
 474          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 475          *          border          If present, show a border around the image
 476          *          align           Horizontal alignment (left, right, center, none)
 477          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 478          *                          bottom, text-bottom)
 479          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 480          *          caption         HTML for image caption.
 481          *          link-url        URL to link to
 482          *          link-title      Title object to link to
 483          *          link-target     Value for the target attribue, only with link-url
 484          *          no-link         Boolean, suppress description link
 485          *
 486          * @param $handlerParams Array: associative array of media handler parameters, to be passed
 487          *       to transform(). Typical keys are "width" and "page".
 488          * @param $time String: timestamp of the file, set as false for current
 489          * @param $query String: query params for desc url
 490          * @param $widthOption: Used by the parser to remember the user preference thumbnailsize
 491          * @return String: HTML for an image, with links, wrappers, etc.
 492          */
 493         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 494                 $handlerParams = array(), $time = false, $query = "", $widthOption = null )
 495         {
 496                 $res = null;
 497                 $dummy = new DummyLinker;
 498                 if ( !wfRunHooks( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
 499                         &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
 500                         return $res;
 501                 }
 502
 503                 if ( $file && !$file->allowInlineDisplay() ) {
 504                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 505                         return self::link( $title );
 506                 }
 507
 508                 // Shortcuts
 509                 $fp =& $frameParams;
 510                 $hp =& $handlerParams;
 511
 512                 // Clean up parameters
 513                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 514                 if ( !isset( $fp['align'] ) ) {
 515                         $fp['align'] = '';
 516                 }
 517                 if ( !isset( $fp['alt'] ) ) {
 518                         $fp['alt'] = '';
 519                 }
 520                 if ( !isset( $fp['title'] ) ) {
 521                         $fp['title'] = '';
 522                 }
 523
 524                 $prefix = $postfix = '';
 525
 526                 if ( 'center' == $fp['align'] ) {
 527                         $prefix  = '<div class="center">';
 528                         $postfix = '</div>';
 529                         $fp['align']   = 'none';
 530                 }
 531                 if ( $file && !isset( $hp['width'] ) ) {
 532                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 533                                 // If its a vector image, and user only specifies height
 534                                 // we don't want it to be limited by its "normal" width.
 535                                 global $wgSVGMaxSize;
 536                                 $hp['width'] = $wgSVGMaxSize;
 537                         } else {
 538                                 $hp['width'] = $file->getWidth( $page );
 539                         }
 540
 541                         if ( isset( $fp['thumbnail'] ) || isset( $fp['framed'] ) || isset( $fp['frameless'] ) || !$hp['width'] ) {
 542                                 global $wgThumbLimits, $wgThumbUpright;
 543                                 if ( !isset( $widthOption ) || !isset( $wgThumbLimits[$widthOption] ) ) {
 544                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 545                                 }
 546
 547                                 // Reduce width for upright images when parameter 'upright' is used
 548                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 549                                         $fp['upright'] = $wgThumbUpright;
 550                                 }
 551                                 // For caching health: If width scaled down due to upright parameter, round to full __0 pixel to avoid the creation of a lot of odd thumbs
 552                                 $prefWidth = isset( $fp['upright'] ) ?
 553                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 554                                         $wgThumbLimits[$widthOption];
 555
 556                                 // Use width which is smaller: real image width or user preference width
 557                                 // Unless image is scalable vector.
 558                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 559                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 560                                         $hp['width'] = $prefWidth;
 561                                 }
 562                         }
 563                 }
 564
 565                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 566                         global $wgContLang;
 567                         # Create a thumbnail. Alignment depends on language
 568                         # writing direction, # right aligned for left-to-right-
 569                         # languages ("Western languages"), left-aligned
 570                         # for right-to-left-languages ("Semitic languages")
 571                         #
 572                         # If  thumbnail width has not been provided, it is set
 573                         # to the default user option as specified in Language*.php
 574                         if ( $fp['align'] == '' ) {
 575                                 $fp['align'] = $wgContLang->alignEnd();
 576                         }
 577                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 578                 }
 579
 580                 if ( $file && isset( $fp['frameless'] ) ) {
 581                         $srcWidth = $file->getWidth( $page );
 582                         # For "frameless" option: do not present an image bigger than the source (for bitmap-style images)
 583                         # This is the same behaviour as the "thumb" option does it already.
 584                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 585                                 $hp['width'] = $srcWidth;
 586                         }
 587                 }
 588
 589                 if ( $file && isset( $hp['width'] ) ) {
 590                         # Create a resized image, without the additional thumbnail features
 591                         $thumb = $file->transform( $hp );
 592                 } else {
 593                         $thumb = false;
 594                 }
 595
 596                 if ( !$thumb ) {
 597                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 598                 } else {
 599                         $params = array(
 600                                 'alt' => $fp['alt'],
 601                                 'title' => $fp['title'],
 602                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false ,
 603                                 'img-class' => isset( $fp['border'] ) ? 'thumbborder' : false );
 604                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 605
 606                         $s = $thumb->toHtml( $params );
 607                 }
 608                 if ( $fp['align'] != '' ) {
 609                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 610                 }
 611                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 612         }
 613
 614         /**
 615          * Get the link parameters for MediaTransformOutput::toHtml() from given
 616          * frame parameters supplied by the Parser.
 617          * @param $frameParams The frame parameters
 618          * @param $query An optional query string to add to description page links
 619          */
 620         private static function getImageLinkMTOParams( $frameParams, $query = '' ) {
 621                 $mtoParams = array();
 622                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 623                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 624                         if ( isset( $frameParams['link-target'] ) ) {
 625                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 626                         }
 627                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 628                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 629                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 630                         // No link
 631                 } else {
 632                         $mtoParams['desc-link'] = true;
 633                         $mtoParams['desc-query'] = $query;
 634                 }
 635                 return $mtoParams;
 636         }
 637
 638         /**
 639          * Make HTML for a thumbnail including image, border and caption
 640          * @param $title Title object
 641          * @param $file File object or false if it doesn't exist
 642          * @param $label String
 643          * @param $alt String
 644          * @param $align String
 645          * @param $params Array
 646          * @param $framed Boolean
 647          * @param $manualthumb String
 648          */
 649         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 650                 $align = 'right', $params = array(), $framed = false , $manualthumb = "" )
 651         {
 652                 $frameParams = array(
 653                         'alt' => $alt,
 654                         'caption' => $label,
 655                         'align' => $align
 656                 );
 657                 if ( $framed ) {
 658                         $frameParams['framed'] = true;
 659                 }
 660                 if ( $manualthumb ) {
 661                         $frameParams['manualthumb'] = $manualthumb;
 662                 }
 663                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 664         }
 665
 666         /**
 667          * @param $title Title
 668          * @param  $file File
 669          * @param array $frameParams
 670          * @param array $handlerParams
 671          * @param bool $time
 672          * @param string $query
 673          * @return mixed
 674          */
 675         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 676                 $handlerParams = array(), $time = false, $query = "" )
 677         {
 678                 global $wgStylePath, $wgContLang;
 679                 $exists = $file && $file->exists();
 680
 681                 # Shortcuts
 682                 $fp =& $frameParams;
 683                 $hp =& $handlerParams;
 684
 685                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 686                 if ( !isset( $fp['align'] ) ) $fp['align'] = 'right';
 687                 if ( !isset( $fp['alt'] ) ) $fp['alt'] = '';
 688                 if ( !isset( $fp['title'] ) ) $fp['title'] = '';
 689                 if ( !isset( $fp['caption'] ) ) $fp['caption'] = '';
 690
 691                 if ( empty( $hp['width'] ) ) {
 692                         // Reduce width for upright images when parameter 'upright' is used
 693                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 694                 }
 695                 $thumb = false;
 696
 697                 if ( !$exists ) {
 698                         $outerWidth = $hp['width'] + 2;
 699                 } else {
 700                         if ( isset( $fp['manualthumb'] ) ) {
 701                                 # Use manually specified thumbnail
 702                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 703                                 if ( $manual_title ) {
 704                                         $manual_img = wfFindFile( $manual_title );
 705                                         if ( $manual_img ) {
 706                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 707                                         } else {
 708                                                 $exists = false;
 709                                         }
 710                                 }
 711                         } elseif ( isset( $fp['framed'] ) ) {
 712                                 // Use image dimensions, don't scale
 713                                 $thumb = $file->getUnscaledThumb( $hp );
 714                         } else {
 715                                 # Do not present an image bigger than the source, for bitmap-style images
 716                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behaviour
 717                                 $srcWidth = $file->getWidth( $page );
 718                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 719                                         $hp['width'] = $srcWidth;
 720                                 }
 721                                 $thumb = $file->transform( $hp );
 722                         }
 723
 724                         if ( $thumb ) {
 725                                 $outerWidth = $thumb->getWidth() + 2;
 726                         } else {
 727                                 $outerWidth = $hp['width'] + 2;
 728                         }
 729                 }
 730
 731                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 732                 # So we don't need to pass it here in $query. However, the URL for the
 733                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 734                 $url = $title->getLocalURL( $query );
 735                 if ( $page ) {
 736                         $url = wfAppendQuery( $url, 'page=' . urlencode( $page ) );
 737                 }
 738
 739                 $s = "<div class=\"thumb t{$fp['align']}\"><div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 740                 if ( !$exists ) {
 741                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 742                         $zoomIcon = '';
 743                 } elseif ( !$thumb ) {
 744                         $s .= htmlspecialchars( wfMsg( 'thumbnail_error', '' ) );
 745                         $zoomIcon = '';
 746                 } else {
 747                         $params = array(
 748                                 'alt' => $fp['alt'],
 749                                 'title' => $fp['title'],
 750                                 'img-class' => 'thumbimage' );
 751                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 752                         $s .= $thumb->toHtml( $params );
 753                         if ( isset( $fp['framed'] ) ) {
 754                                 $zoomIcon = "";
 755                         } else {
 756                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 757                                         Html::rawElement( 'a', array(
 758                                                 'href' => $url,
 759                                                 'class' => 'internal',
 760                                                 'title' => wfMsg( 'thumbnail-more' ) ),
 761                                                 Html::element( 'img', array(
 762                                                         'src' => $wgStylePath . '/common/images/magnify-clip' . ( $wgContLang->isRTL() ? '-rtl' : '' ) . '.png',
 763                                                         'width' => 15,
 764                                                         'height' => 11,
 765                                                         'alt' => "" ) ) ) );
 766                         }
 767                 }
 768                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 769                 return str_replace( "\n", ' ', $s );
 770         }
 771
 772         /**
 773          * Make a "broken" link to an image
 774          *
 775          * @param $title Title object
 776          * @param $html String: link label in htmlescaped text form
 777          * @param $query String: query string
 778          * @param $trail String: link trail (HTML fragment)
 779          * @param $prefix String: link prefix (HTML fragment)
 780          * @param $time Boolean: a file of a certain timestamp was requested
 781          * @return String
 782          */
 783         public static function makeBrokenImageLinkObj( $title, $html = '', $query = '', $trail = '', $prefix = '', $time = false ) {
 784                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 785                 if ( ! $title instanceof Title ) {
 786                         return "<!-- ERROR -->{$prefix}{$html}{$trail}";
 787                 }
 788                 wfProfileIn( __METHOD__ );
 789                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 790
 791                 list( $inside, $trail ) = self::splitTrail( $trail );
 792                 if ( $html == '' )
 793                         $html = htmlspecialchars( $title->getPrefixedText() );
 794
 795                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads ) && !$currentExists ) {
 796                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 797
 798                         if ( $redir ) {
 799                                 wfProfileOut( __METHOD__ );
 800                                 return self::linkKnown( $title, "$prefix$html$inside", array(), $query ) . $trail;
 801                         }
 802
 803                         $href = self::getUploadUrl( $title, $query );
 804
 805                         wfProfileOut( __METHOD__ );
 806                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 807                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 808                                 "$prefix$html$inside</a>$trail";
 809                 } else {
 810                         wfProfileOut( __METHOD__ );
 811                         return self::linkKnown( $title, "$prefix$html$inside", array(), $query ) . $trail;
 812                 }
 813         }
 814
 815         /**
 816          * Get the URL to upload a certain file
 817          *
 818          * @param $destFile Title object of the file to upload
 819          * @param $query String: urlencoded query string to prepend
 820          * @return String: urlencoded URL
 821          */
 822         protected static function getUploadUrl( $destFile, $query = '' ) {
 823                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 824                 $q = 'wpDestFile=' . $destFile->getPartialUrl();
 825                 if ( $query != '' )
 826                         $q .= '&' . $query;
 827
 828                 if ( $wgUploadMissingFileUrl ) {
 829                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 830                 } elseif( $wgUploadNavigationUrl ) {
 831                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 832                 } else {
 833                         $upload = SpecialPage::getTitleFor( 'Upload' );
 834                         return $upload->getLocalUrl( $q );
 835                 }
 836         }
 837
 838         /**
 839          * Create a direct link to a given uploaded file.
 840          *
 841          * @param $title Title object.
 842          * @param $html String: pre-sanitized HTML
 843          * @param $time string: MW timestamp of file creation time
 844          * @return String: HTML
 845          */
 846         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 847                 $img = wfFindFile( $title, array( 'time' => $time ) );
 848                 return self::makeMediaLinkFile( $title, $img, $html );
 849         }
 850
 851         /**
 852          * Create a direct link to a given uploaded file.
 853          * This will make a broken link if $file is false.
 854          *
 855          * @param $title Title object.
 856          * @param $file File|false mixed File object or false
 857          * @param $html String: pre-sanitized HTML
 858          * @return String: HTML
 859          *
 860          * @todo Handle invalid or missing images better.
 861          */
 862         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
 863                 if ( $file && $file->exists() ) {
 864                         $url = $file->getURL();
 865                         $class = 'internal';
 866                 } else {
 867                         $url = self::getUploadUrl( $title );
 868                         $class = 'new';
 869                 }
 870                 $alt = htmlspecialchars( $title->getText(), ENT_QUOTES );
 871                 if ( $html == '' ) {
 872                         $html = $alt;
 873                 }
 874                 $u = htmlspecialchars( $url );
 875                 return "<a href=\"{$u}\" class=\"$class\" title=\"{$alt}\">{$html}</a>";
 876         }
 877
 878         /**
 879          * Make a link to a special page given its name and, optionally,
 880          * a message key from the link text.
 881          * Usage example: Linker::specialLink( 'Recentchanges' )
 882          *
 883          * @return string
 884          */
 885         public static function specialLink( $name, $key = '' ) {
 886                 if ( $key == '' ) {
 887                         $key = strtolower( $name );
 888                 }
 889
 890                 return self::linkKnown( SpecialPage::getTitleFor( $name ) , wfMsg( $key ) );
 891         }
 892
 893         /**
 894          * Make an external link
 895          * @param $url String: URL to link to
 896          * @param $text String: text of link
 897          * @param $escape Boolean: do we escape the link text?
 898          * @param $linktype String: type of external link. Gets added to the classes
 899          * @param $attribs Array of extra attributes to <a>
 900          */
 901         public static function makeExternalLink( $url, $text, $escape = true, $linktype = '', $attribs = array() ) {
 902                 $class = "external";
 903                 if ( $linktype ) {
 904                         $class .= " $linktype";
 905                 }
 906                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
 907                         $class .= " {$attribs['class']}";
 908                 }
 909                 $attribs['class'] = $class;
 910
 911                 if ( $escape ) {
 912                         $text = htmlspecialchars( $text );
 913                 }
 914                 $link = '';
 915                 $success = wfRunHooks( 'LinkerMakeExternalLink',
 916                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
 917                 if ( !$success ) {
 918                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link with url {$url} and text {$text} to {$link}\n", true );
 919                         return $link;
 920                 }
 921                 $attribs['href'] = $url;
 922                 return Html::rawElement( 'a', $attribs, $text );
 923         }
 924
 925         /**
 926          * Make user link (or user contributions for unregistered users)
 927          * @param $userId   Integer: user id in database.
 928          * @param $userText String: user name in database
 929          * @return String: HTML fragment
 930          */
 931         public static function userLink( $userId, $userText ) {
 932                 if ( $userId == 0 ) {
 933                         $page = SpecialPage::getTitleFor( 'Contributions', $userText );
 934                 } else {
 935                         $page = Title::makeTitle( NS_USER, $userText );
 936                 }
 937                 return self::link( $page, htmlspecialchars( $userText ), array( 'class' => 'mw-userlink' ) );
 938         }
 939
 940         /**
 941          * Generate standard user tool links (talk, contributions, block link, etc.)
 942          *
 943          * @param $userId Integer: user identifier
 944          * @param $userText String: user name or IP address
 945          * @param $redContribsWhenNoEdits Boolean: should the contributions link be
 946          *        red if the user has no edits?
 947          * @param $flags Integer: customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK and Linker::TOOL_LINKS_EMAIL)
 948          * @param $edits Integer: user edit count (optional, for performance)
 949          * @return String: HTML fragment
 950          */
 951         public static function userToolLinks(
 952                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
 953         ) {
 954                 global $wgUser, $wgDisableAnonTalk, $wgLang;
 955                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
 956                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
 957                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
 958
 959                 $items = array();
 960                 if ( $talkable ) {
 961                         $items[] = self::userTalkLink( $userId, $userText );
 962                 }
 963                 if ( $userId ) {
 964                         // check if the user has an edit
 965                         $attribs = array();
 966                         if ( $redContribsWhenNoEdits ) {
 967                                 $count = !is_null( $edits ) ? $edits : User::edits( $userId );
 968                                 if ( $count == 0 ) {
 969                                         $attribs['class'] = 'new';
 970                                 }
 971                         }
 972                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
 973
 974                         $items[] = self::link( $contribsPage, wfMsgHtml( 'contribslink' ), $attribs );
 975                 }
 976                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
 977                         $items[] = self::blockLink( $userId, $userText );
 978                 }
 979
 980                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
 981                         $items[] = self::emailLink( $userId, $userText );
 982                 }
 983
 984                 wfRunHooks( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
 985
 986                 if ( $items ) {
 987                         return ' <span class="mw-usertoollinks">(' . $wgLang->pipeList( $items ) . ')</span>';
 988                 } else {
 989                         return '';
 990                 }
 991         }
 992
 993         /**
 994          * Alias for userToolLinks( $userId, $userText, true );
 995          * @param $userId Integer: user identifier
 996          * @param $userText String: user name or IP address
 997          * @param $edits Integer: user edit count (optional, for performance)
 998          */
 999         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1000                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1001         }
1002
1003
1004         /**
1005          * @param $userId Integer: user id in database.
1006          * @param $userText String: user name in database.
1007          * @return String: HTML fragment with user talk link
1008          */
1009         public static function userTalkLink( $userId, $userText ) {
1010                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1011                 $userTalkLink = self::link( $userTalkPage, wfMsgHtml( 'talkpagelinktext' ) );
1012                 return $userTalkLink;
1013         }
1014
1015         /**
1016          * @param $userId Integer: userid
1017          * @param $userText String: user name in database.
1018          * @return String: HTML fragment with block link
1019          */
1020         public static function blockLink( $userId, $userText ) {
1021                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1022                 $blockLink = self::link( $blockPage, wfMsgHtml( 'blocklink' ) );
1023                 return $blockLink;
1024         }
1025
1026         /**
1027          * @param $userId Integer: userid
1028          * @param $userText String: user name in database.
1029          * @return String: HTML fragment with e-mail user link
1030          */
1031         public static function emailLink( $userId, $userText ) {
1032                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1033                 $emailLink = self::link( $emailPage, wfMsgHtml( 'emaillink' ) );
1034                 return $emailLink;
1035         }
1036
1037         /**
1038          * Generate a user link if the current user is allowed to view it
1039          * @param $rev Revision object.
1040          * @param $isPublic Boolean: show only if all users can see it
1041          * @return String: HTML fragment
1042          */
1043         public static function revUserLink( $rev, $isPublic = false ) {
1044                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1045                         $link = wfMsgHtml( 'rev-deleted-user' );
1046                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1047                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1048                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1049                 } else {
1050                         $link = wfMsgHtml( 'rev-deleted-user' );
1051                 }
1052                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1053                         return '<span class="history-deleted">' . $link . '</span>';
1054                 }
1055                 return $link;
1056         }
1057
1058         /**
1059          * Generate a user tool link cluster if the current user is allowed to view it
1060          * @param $rev Revision object.
1061          * @param $isPublic Boolean: show only if all users can see it
1062          * @return string HTML
1063          */
1064         public static function revUserTools( $rev, $isPublic = false ) {
1065                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1066                         $link = wfMsgHtml( 'rev-deleted-user' );
1067                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1068                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1069                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1070                         $link = self::userLink( $userId, $userText ) .
1071                                 ' ' . self::userToolLinks( $userId, $userText );
1072                 } else {
1073                         $link = wfMsgHtml( 'rev-deleted-user' );
1074                 }
1075                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1076                         return ' <span class="history-deleted">' . $link . '</span>';
1077                 }
1078                 return $link;
1079         }
1080
1081         /**
1082          * This function is called by all recent changes variants, by the page history,
1083          * and by the user contributions list. It is responsible for formatting edit
1084          * comments. It escapes any HTML in the comment, but adds some CSS to format
1085          * auto-generated comments (from section editing) and formats [[wikilinks]].
1086          *
1087          * @author Erik Moeller <moeller@scireview.de>
1088          *
1089          * Note: there's not always a title to pass to this function.
1090          * Since you can't set a default parameter for a reference, I've turned it
1091          * temporarily to a value pass. Should be adjusted further. --brion
1092          *
1093          * @param $comment String
1094          * @param $title Mixed: Title object (to generate link to the section in autocomment) or null
1095          * @param $local Boolean: whether section links should refer to local page
1096          */
1097         public static function formatComment( $comment, $title = null, $local = false ) {
1098                 wfProfileIn( __METHOD__ );
1099
1100                 # Sanitize text a bit:
1101                 $comment = str_replace( "\n", " ", $comment );
1102                 # Allow HTML entities (for bug 13815)
1103                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1104
1105                 # Render autocomments and make links:
1106                 $comment = self::formatAutocomments( $comment, $title, $local );
1107                 $comment = self::formatLinksInComment( $comment, $title, $local );
1108
1109                 wfProfileOut( __METHOD__ );
1110                 return $comment;
1111         }
1112
1113         /**
1114          * @var Title
1115          */
1116         static $autocommentTitle;
1117         static $autocommentLocal;
1118
1119         /**
1120          * The pattern for autogen comments is / * foo * /, which makes for
1121          * some nasty regex.
1122          * We look for all comments, match any text before and after the comment,
1123          * add a separator where needed and format the comment itself with CSS
1124          * Called by Linker::formatComment.
1125          *
1126          * @param $comment String: comment text
1127          * @param $title An optional title object used to links to sections
1128          * @param $local Boolean: whether section links should refer to local page
1129          * @return String: formatted comment
1130          */
1131         private static function formatAutocomments( $comment, $title = null, $local = false ) {
1132                 // Bah!
1133                 self::$autocommentTitle = $title;
1134                 self::$autocommentLocal = $local;
1135                 $comment = preg_replace_callback(
1136                         '!(.*)/\*\s*(.*?)\s*\*/(.*)!',
1137                         array( 'Linker', 'formatAutocommentsCallback' ),
1138                         $comment );
1139                 self::$autocommentTitle = null;
1140                 self::$autocommentLocal = null;
1141                 return $comment;
1142         }
1143
1144         /**
1145          * @param $match
1146          * @return string
1147          */
1148         private static function formatAutocommentsCallback( $match ) {
1149                 global $wgLang;
1150                 $title = self::$autocommentTitle;
1151                 $local = self::$autocommentLocal;
1152
1153                 $pre = $match[1];
1154                 $auto = $match[2];
1155                 $post = $match[3];
1156                 $link = '';
1157                 if ( $title ) {
1158                         $section = $auto;
1159
1160                         # Remove links that a user may have manually put in the autosummary
1161                         # This could be improved by copying as much of Parser::stripSectionName as desired.
1162                         $section = str_replace( '[[:', '', $section );
1163                         $section = str_replace( '[[', '', $section );
1164                         $section = str_replace( ']]', '', $section );
1165
1166                         $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1167                         if ( $local ) {
1168                                 $sectionTitle = Title::newFromText( '#' . $section );
1169                         } else {
1170                                 $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1171                                         $title->getDBkey(), $section );
1172                         }
1173                         if ( $sectionTitle ) {
1174                                 $link = self::link( $sectionTitle,
1175                                         $wgLang->getArrow(), array(), array(),
1176                                         'noclasses' );
1177                         } else {
1178                                 $link = '';
1179                         }
1180                 }
1181                 $auto = "$link$auto";
1182                 if ( $pre ) {
1183                         # written summary $presep autocomment (summary /* section */)
1184                         $auto = wfMsgExt( 'autocomment-prefix', array( 'escapenoentities', 'content' ) ) . $auto;
1185                 }
1186                 if ( $post ) {
1187                         # autocomment $postsep written summary (/* section */ summary)
1188                         $auto .= wfMsgExt( 'colon-separator', array( 'escapenoentities', 'content' ) );
1189                 }
1190                 $auto = '<span class="autocomment">' . $auto . '</span>';
1191                 $comment = $pre . $auto . $post;
1192                 return $comment;
1193         }
1194
1195         /**
1196          * @var Title
1197          */
1198         static $commentContextTitle;
1199         static $commentLocal;
1200
1201         /**
1202          * Formats wiki links and media links in text; all other wiki formatting
1203          * is ignored
1204          *
1205          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1206          * @param $comment String: text to format links in
1207          * @param $title An optional title object used to links to sections
1208          * @param $local Boolean: whether section links should refer to local page
1209          * @return String
1210          */
1211         public static function formatLinksInComment( $comment, $title = null, $local = false ) {
1212                 self::$commentContextTitle = $title;
1213                 self::$commentLocal = $local;
1214                 $html = preg_replace_callback(
1215                         '/\[\[:?(.*?)(\|(.*?))*\]\]([^[]*)/',
1216                         array( 'Linker', 'formatLinksInCommentCallback' ),
1217                         $comment );
1218                 self::$commentContextTitle = null;
1219                 self::$commentLocal = null;
1220                 return $html;
1221         }
1222
1223         /**
1224          * @param $match
1225          * @return mixed
1226          */
1227         protected static function formatLinksInCommentCallback( $match ) {
1228                 global $wgContLang;
1229
1230                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1231                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1232
1233                 $comment = $match[0];
1234
1235                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1236                 if ( strpos( $match[1], '%' ) !== false ) {
1237                         $match[1] = str_replace( array( '<', '>' ), array( '&lt;', '&gt;' ), rawurldecode( $match[1] ) );
1238                 }
1239
1240                 # Handle link renaming [[foo|text]] will show link as "text"
1241                 if ( $match[3] != "" ) {
1242                         $text = $match[3];
1243                 } else {
1244                         $text = $match[1];
1245                 }
1246                 $submatch = array();
1247                 $thelink = null;
1248                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1249                         # Media link; trail not supported.
1250                         $linkRegexp = '/\[\[(.*?)\]\]/';
1251                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1252                         if ( $title ) {
1253                                 $thelink = self::makeMediaLinkObj( $title, $text );
1254                         }
1255                 } else {
1256                         # Other kind of link
1257                         if ( preg_match( $wgContLang->linkTrail(), $match[4], $submatch ) ) {
1258                                 $trail = $submatch[1];
1259                         } else {
1260                                 $trail = "";
1261                         }
1262                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1263                         if ( isset( $match[1][0] ) && $match[1][0] == ':' )
1264                                 $match[1] = substr( $match[1], 1 );
1265                         list( $inside, $trail ) = self::splitTrail( $trail );
1266
1267                         $linkText = $text;
1268                         $linkTarget = self::normalizeSubpageLink( self::$commentContextTitle,
1269                                 $match[1], $linkText );
1270
1271                         $target = Title::newFromText( $linkTarget );
1272                         if ( $target ) {
1273                                 if ( $target->getText() == '' && $target->getInterwiki() === ''
1274                                         && !self::$commentLocal && self::$commentContextTitle )
1275                                 {
1276                                         $newTarget = clone ( self::$commentContextTitle );
1277                                         $newTarget->setFragment( '#' . $target->getFragment() );
1278                                         $target = $newTarget;
1279                                 }
1280                                 $thelink = self::link(
1281                                         $target,
1282                                         $linkText . $inside
1283                                 ) . $trail;
1284                         }
1285                 }
1286                 if ( $thelink ) {
1287                         // If the link is still valid, go ahead and replace it in!
1288                         $comment = preg_replace( $linkRegexp, StringUtils::escapeRegexReplacement( $thelink ), $comment, 1 );
1289                 }
1290
1291                 return $comment;
1292         }
1293
1294         /**
1295          * @param $contextTitle Title
1296          * @param  $target
1297          * @param  $text
1298          * @return string
1299          */
1300         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1301                 # Valid link forms:
1302                 # Foobar -- normal
1303                 # :Foobar -- override special treatment of prefix (images, language links)
1304                 # /Foobar -- convert to CurrentPage/Foobar
1305                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1306                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1307                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1308
1309                 wfProfileIn( __METHOD__ );
1310                 $ret = $target; # default return value is no change
1311
1312                 # Some namespaces don't allow subpages,
1313                 # so only perform processing if subpages are allowed
1314                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1315                         $hash = strpos( $target, '#' );
1316                         if ( $hash !== false ) {
1317                                 $suffix = substr( $target, $hash );
1318                                 $target = substr( $target, 0, $hash );
1319                         } else {
1320                                 $suffix = '';
1321                         }
1322                         # bug 7425
1323                         $target = trim( $target );
1324                         # Look at the first character
1325                         if ( $target != '' && $target[0] === '/' ) {
1326                                 # / at end means we don't want the slash to be shown
1327                                 $m = array();
1328                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1329                                 if ( $trailingSlashes ) {
1330                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1331                                 } else {
1332                                         $noslash = substr( $target, 1 );
1333                                 }
1334
1335                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1336                                 if ( $text === '' ) {
1337                                         $text = $target . $suffix;
1338                                 } # this might be changed for ugliness reasons
1339                         } else {
1340                                 # check for .. subpage backlinks
1341                                 $dotdotcount = 0;
1342                                 $nodotdot = $target;
1343                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1344                                         ++$dotdotcount;
1345                                         $nodotdot = substr( $nodotdot, 3 );
1346                                 }
1347                                 if ( $dotdotcount > 0 ) {
1348                                         $exploded = explode( '/', $contextTitle->GetPrefixedText() );
1349                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1350                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1351                                                 # / at the end means don't show full path
1352                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1353                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1354                                                         if ( $text === '' ) {
1355                                                                 $text = $nodotdot . $suffix;
1356                                                         }
1357                                                 }
1358                                                 $nodotdot = trim( $nodotdot );
1359                                                 if ( $nodotdot != '' ) {
1360                                                         $ret .= '/' . $nodotdot;
1361                                                 }
1362                                                 $ret .= $suffix;
1363                                         }
1364                                 }
1365                         }
1366                 }
1367
1368                 wfProfileOut( __METHOD__ );
1369                 return $ret;
1370         }
1371
1372         /**
1373          * Wrap a comment in standard punctuation and formatting if
1374          * it's non-empty, otherwise return empty string.
1375          *
1376          * @param $comment String
1377          * @param $title Mixed: Title object (to generate link to section in autocomment) or null
1378          * @param $local Boolean: whether section links should refer to local page
1379          *
1380          * @return string
1381          */
1382         public static function commentBlock( $comment, $title = null, $local = false ) {
1383                 // '*' used to be the comment inserted by the software way back
1384                 // in antiquity in case none was provided, here for backwards
1385                 // compatability, acc. to brion -ævar
1386                 if ( $comment == '' || $comment == '*' ) {
1387                         return '';
1388                 } else {
1389                         $formatted = self::formatComment( $comment, $title, $local );
1390                         return " <span class=\"comment\" dir=\"auto\">($formatted)</span>";
1391                 }
1392         }
1393
1394         /**
1395          * Wrap and format the given revision's comment block, if the current
1396          * user is allowed to view it.
1397          *
1398          * @param $rev Revision object
1399          * @param $local Boolean: whether section links should refer to local page
1400          * @param $isPublic Boolean: show only if all users can see it
1401          * @return String: HTML fragment
1402          */
1403         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1404                 if ( $rev->getRawComment() == "" ) {
1405                         return "";
1406                 }
1407                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1408                         $block = " <span class=\"comment\">" . wfMsgHtml( 'rev-deleted-comment' ) . "</span>";
1409                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1410                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1411                                 $rev->getTitle(), $local );
1412                 } else {
1413                         $block = " <span class=\"comment\">" . wfMsgHtml( 'rev-deleted-comment' ) . "</span>";
1414                 }
1415                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1416                         return " <span class=\"history-deleted\">$block</span>";
1417                 }
1418                 return $block;
1419         }
1420
1421         /**
1422          * @param $size
1423          * @return string
1424          */
1425         public static function formatRevisionSize( $size ) {
1426                 if ( $size == 0 ) {
1427                         $stxt = wfMsgExt( 'historyempty', 'parsemag' );
1428                 } else {
1429                         global $wgLang;
1430                         $stxt = wfMsgExt( 'nbytes', 'parsemag', $wgLang->formatNum( $size ) );
1431                         $stxt = "($stxt)";
1432                 }
1433                 $stxt = htmlspecialchars( $stxt );
1434                 return "<span class=\"history-size\">$stxt</span>";
1435         }
1436
1437         /**
1438          * Add another level to the Table of Contents
1439          *
1440          * @return string
1441          */
1442         public static function tocIndent() {
1443                 return "\n<ul>";
1444         }
1445
1446         /**
1447          * Finish one or more sublevels on the Table of Contents
1448          *
1449          * @return string
1450          */
1451         public static function tocUnindent( $level ) {
1452                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1453         }
1454
1455         /**
1456          * parameter level defines if we are on an indentation level
1457          *
1458          * @return string
1459          */
1460         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1461                 $classes = "toclevel-$level";
1462                 if ( $sectionIndex !== false ) {
1463                         $classes .= " tocsection-$sectionIndex";
1464                 }
1465                 return "\n<li class=\"$classes\"><a href=\"#" .
1466                         $anchor . '"><span class="tocnumber">' .
1467                         $tocnumber . '</span> <span class="toctext">' .
1468                         $tocline . '</span></a>';
1469         }
1470
1471         /**
1472          * End a Table Of Contents line.
1473          * tocUnindent() will be used instead if we're ending a line below
1474          * the new level.
1475          */
1476         public static function tocLineEnd() {
1477                 return "</li>\n";
1478         }
1479
1480         /**
1481          * Wraps the TOC in a table and provides the hide/collapse javascript.
1482          *
1483          * @param $toc String: html of the Table Of Contents
1484          * @param $lang mixed: Language code for the toc title
1485          * @return String: full html of the TOC
1486          */
1487         public static function tocList( $toc, $lang = false ) {
1488                 $title = wfMsgExt( 'toc', array( 'language' => $lang, 'escape' ) );
1489                 return
1490                    '<table id="toc" class="toc"><tr><td>'
1491                  . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1492                  . $toc
1493                  . "</ul>\n</td></tr></table>\n";
1494         }
1495
1496         /**
1497          * Generate a table of contents from a section tree
1498          * Currently unused.
1499          *
1500          * @param $tree Return value of ParserOutput::getSections()
1501          * @return String: HTML fragment
1502          */
1503         public static function generateTOC( $tree ) {
1504                 $toc = '';
1505                 $lastLevel = 0;
1506                 foreach ( $tree as $section ) {
1507                         if ( $section['toclevel'] > $lastLevel )
1508                                 $toc .= self::tocIndent();
1509                         elseif ( $section['toclevel'] < $lastLevel )
1510                                 $toc .= self::tocUnindent(
1511                                         $lastLevel - $section['toclevel'] );
1512                         else
1513                                 $toc .= self::tocLineEnd();
1514
1515                         $toc .= self::tocLine( $section['anchor'],
1516                                 $section['line'], $section['number'],
1517                                 $section['toclevel'], $section['index'] );
1518                         $lastLevel = $section['toclevel'];
1519                 }
1520                 $toc .= self::tocLineEnd();
1521                 return self::tocList( $toc );
1522         }
1523
1524         /**
1525          * Create a headline for content
1526          *
1527          * @param $level Integer: the level of the headline (1-6)
1528          * @param $attribs String: any attributes for the headline, starting with
1529          *                 a space and ending with '>'
1530          *                 This *must* be at least '>' for no attribs
1531          * @param $anchor String: the anchor to give the headline (the bit after the #)
1532          * @param $html String: html for the text of the header
1533          * @param $link String: HTML to add for the section edit link
1534          * @param $legacyAnchor Mixed: a second, optional anchor to give for
1535          *   backward compatibility (false to omit)
1536          *
1537          * @return String: HTML headline
1538          */
1539         public static function makeHeadline( $level, $attribs, $anchor, $html, $link, $legacyAnchor = false ) {
1540                 $ret = "<h$level$attribs"
1541                         . $link
1542                         . " <span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1543                         . "</h$level>";
1544                 if ( $legacyAnchor !== false ) {
1545                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1546                 }
1547                 return $ret;
1548         }
1549
1550         /**
1551          * Split a link trail, return the "inside" portion and the remainder of the trail
1552          * as a two-element array
1553          */
1554         static function splitTrail( $trail ) {
1555                 global $wgContLang;
1556                 $regex = $wgContLang->linkTrail();
1557                 $inside = '';
1558                 if ( $trail !== '' ) {
1559                         $m = array();
1560                         if ( preg_match( $regex, $trail, $m ) ) {
1561                                 $inside = $m[1];
1562                                 $trail = $m[2];
1563                         }
1564                 }
1565                 return array( $inside, $trail );
1566         }
1567
1568         /**
1569          * Generate a rollback link for a given revision.  Currently it's the
1570          * caller's responsibility to ensure that the revision is the top one. If
1571          * it's not, of course, the user will get an error message.
1572          *
1573          * If the calling page is called with the parameter &bot=1, all rollback
1574          * links also get that parameter. It causes the edit itself and the rollback
1575          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1576          * changes, so this allows sysops to combat a busy vandal without bothering
1577          * other users.
1578          *
1579          * @param $rev Revision object
1580          */
1581         public static function generateRollback( $rev ) {
1582                 return '<span class="mw-rollback-link">['
1583                         . self::buildRollbackLink( $rev )
1584                         . ']</span>';
1585         }
1586
1587         /**
1588          * Build a raw rollback link, useful for collections of "tool" links
1589          *
1590          * @param $rev Revision object
1591          * @return String: HTML fragment
1592          */
1593         public static function buildRollbackLink( $rev ) {
1594                 global $wgRequest, $wgUser;
1595                 $title = $rev->getTitle();
1596                 $query = array(
1597                         'action' => 'rollback',
1598                         'from' => $rev->getUserText(),
1599                         'token' => $wgUser->getEditToken( array( $title->getPrefixedText(), $rev->getUserText() ) ),
1600                 );
1601                 if ( $wgRequest->getBool( 'bot' ) ) {
1602                         $query['bot'] = '1';
1603                         $query['hidediff'] = '1'; // bug 15999
1604                 }
1605                 return self::link(
1606                         $title,
1607                         wfMsgHtml( 'rollbacklink' ),
1608                         array( 'title' => wfMsg( 'tooltip-rollback' ) ),
1609                         $query,
1610                         array( 'known', 'noclasses' )
1611                 );
1612         }
1613
1614         /**
1615          * Returns HTML for the "templates used on this page" list.
1616          *
1617          * @param $templates Array of templates from Article::getUsedTemplate
1618          * or similar
1619          * @param $preview Boolean: whether this is for a preview
1620          * @param $section Boolean: whether this is for a section edit
1621          * @return String: HTML output
1622          */
1623         public static function formatTemplates( $templates, $preview = false, $section = false ) {
1624                 wfProfileIn( __METHOD__ );
1625
1626                 $outText = '';
1627                 if ( count( $templates ) > 0 ) {
1628                         # Do a batch existence check
1629                         $batch = new LinkBatch;
1630                         foreach ( $templates as $title ) {
1631                                 $batch->addObj( $title );
1632                         }
1633                         $batch->execute();
1634
1635                         # Construct the HTML
1636                         $outText = '<div class="mw-templatesUsedExplanation">';
1637                         if ( $preview ) {
1638                                 $outText .= wfMsgExt( 'templatesusedpreview', array( 'parse' ), count( $templates ) );
1639                         } elseif ( $section ) {
1640                                 $outText .= wfMsgExt( 'templatesusedsection', array( 'parse' ), count( $templates ) );
1641                         } else {
1642                                 $outText .= wfMsgExt( 'templatesused', array( 'parse' ), count( $templates ) );
1643                         }
1644                         $outText .= "</div><ul>\n";
1645
1646                         usort( $templates, array( 'Title', 'compare' ) );
1647                         foreach ( $templates as $titleObj ) {
1648                                 $r = $titleObj->getRestrictions( 'edit' );
1649                                 if ( in_array( 'sysop', $r ) ) {
1650                                         $protected = wfMsgExt( 'template-protected', array( 'parseinline' ) );
1651                                 } elseif ( in_array( 'autoconfirmed', $r ) ) {
1652                                         $protected = wfMsgExt( 'template-semiprotected', array( 'parseinline' ) );
1653                                 } else {
1654                                         $protected = '';
1655                                 }
1656                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
1657                                         $editLink = self::link(
1658                                                 $titleObj,
1659                                                 wfMsg( 'editlink' ),
1660                                                 array(),
1661                                                 array( 'action' => 'edit' )
1662                                         );
1663                                 } else {
1664                                         $editLink = self::link(
1665                                                 $titleObj,
1666                                                 wfMsg( 'viewsourcelink' ),
1667                                                 array(),
1668                                                 array( 'action' => 'edit' )
1669                                         );
1670                                 }
1671                                 $outText .= '<li>' . self::link( $titleObj ) . ' (' . $editLink . ') ' . $protected . '</li>';
1672                         }
1673                         $outText .= '</ul>';
1674                 }
1675                 wfProfileOut( __METHOD__  );
1676                 return $outText;
1677         }
1678
1679         /**
1680          * Returns HTML for the "hidden categories on this page" list.
1681          *
1682          * @param $hiddencats Array of hidden categories from Article::getHiddenCategories
1683          * or similar
1684          * @return String: HTML output
1685          */
1686         public static function formatHiddenCategories( $hiddencats ) {
1687                 global $wgLang;
1688                 wfProfileIn( __METHOD__ );
1689
1690                 $outText = '';
1691                 if ( count( $hiddencats ) > 0 ) {
1692                         # Construct the HTML
1693                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
1694                         $outText .= wfMsgExt( 'hiddencategories', array( 'parse' ), $wgLang->formatnum( count( $hiddencats ) ) );
1695                         $outText .= "</div><ul>\n";
1696
1697                         foreach ( $hiddencats as $titleObj ) {
1698                                 $outText .= '<li>' . self::link( $titleObj, null, array(), array(), 'known' ) . "</li>\n"; # If it's hidden, it must exist - no need to check with a LinkBatch
1699                         }
1700                         $outText .= '</ul>';
1701                 }
1702                 wfProfileOut( __METHOD__  );
1703                 return $outText;
1704         }
1705
1706         /**
1707          * Format a size in bytes for output, using an appropriate
1708          * unit (B, KB, MB or GB) according to the magnitude in question
1709          *
1710          * @param $size Size to format
1711          * @return String
1712          */
1713         public static function formatSize( $size ) {
1714                 global $wgLang;
1715                 return htmlspecialchars( $wgLang->formatSize( $size ) );
1716         }
1717
1718         /**
1719          * Given the id of an interface element, constructs the appropriate title
1720          * attribute from the system messages.  (Note, this is usually the id but
1721          * isn't always, because sometimes the accesskey needs to go on a different
1722          * element than the id, for reverse-compatibility, etc.)
1723          *
1724          * @param $name String: id of the element, minus prefixes.
1725          * @param $options Mixed: null or the string 'withaccess' to add an access-
1726          *   key hint
1727          * @return String: contents of the title attribute (which you must HTML-
1728          *   escape), or false for no title attribute
1729          */
1730         public static function titleAttrib( $name, $options = null ) {
1731                 wfProfileIn( __METHOD__ );
1732
1733                 $message = wfMessage( "tooltip-$name" );
1734
1735                 if ( !$message->exists() ) {
1736                         $tooltip = false;
1737                 } else {
1738                         $tooltip = $message->text();
1739                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
1740                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
1741                         # Message equal to '-' means suppress it.
1742                         if (  $tooltip == '-' ) {
1743                                 $tooltip = false;
1744                         }
1745                 }
1746
1747                 if ( $options == 'withaccess' ) {
1748                         $accesskey = self::accesskey( $name );
1749                         if ( $accesskey !== false ) {
1750                                 if ( $tooltip === false || $tooltip === '' ) {
1751                                         $tooltip = "[$accesskey]";
1752                                 } else {
1753                                         $tooltip .= " [$accesskey]";
1754                                 }
1755                         }
1756                 }
1757
1758                 wfProfileOut( __METHOD__ );
1759                 return $tooltip;
1760         }
1761
1762         static $accesskeycache;
1763
1764         /**
1765          * Given the id of an interface element, constructs the appropriate
1766          * accesskey attribute from the system messages.  (Note, this is usually
1767          * the id but isn't always, because sometimes the accesskey needs to go on
1768          * a different element than the id, for reverse-compatibility, etc.)
1769          *
1770          * @param $name String: id of the element, minus prefixes.
1771          * @return String: contents of the accesskey attribute (which you must HTML-
1772          *   escape), or false for no accesskey attribute
1773          */
1774         public static function accesskey( $name ) {
1775                 if ( isset( self::$accesskeycache[$name] ) ) {
1776                         return self::$accesskeycache[$name];
1777                 }
1778                 wfProfileIn( __METHOD__ );
1779
1780                 $message = wfMessage( "accesskey-$name" );
1781
1782                 if ( !$message->exists() ) {
1783                         $accesskey = false;
1784                 } else {
1785                         $accesskey = $message->plain();
1786                         if ( $accesskey === '' || $accesskey === '-' ) {
1787                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
1788                                 # attribute, but this is broken for accesskey: that might be a useful
1789                                 # value.
1790                                 $accesskey = false;
1791                         }
1792                 }
1793
1794                 wfProfileOut( __METHOD__ );
1795                 return self::$accesskeycache[$name] = $accesskey;
1796         }
1797
1798         /**
1799          * Get a revision-deletion link, or disabled link, or nothing, depending
1800          * on user permissions & the settings on the revision.
1801          *
1802          * Will use forward-compatible revision ID in the Special:RevDelete link
1803          * if possible, otherwise the timestamp-based ID which may break after
1804          * undeletion.
1805          *
1806          * @param User $user
1807          * @param Revision $rev
1808          * @param Revision $title
1809          * @return string HTML fragment
1810          */
1811         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
1812                 $canHide = $user->isAllowed( 'deleterevision' );
1813                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1814                         return '';
1815                 }
1816
1817                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
1818                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1819                 } else {
1820                         if ( $rev->getId() ) {
1821                                 // RevDelete links using revision ID are stable across
1822                                 // page deletion and undeletion; use when possible.
1823                                 $query = array(
1824                                         'type'   => 'revision',
1825                                         'target' => $title->getPrefixedDBkey(),
1826                                         'ids'    => $rev->getId()
1827                                 );
1828                         } else {
1829                                 // Older deleted entries didn't save a revision ID.
1830                                 // We have to refer to these by timestamp, ick!
1831                                 $query = array(
1832                                         'type'   => 'archive',
1833                                         'target' => $title->getPrefixedDBkey(),
1834                                         'ids'    => $rev->getTimestamp()
1835                                 );
1836                         }
1837                         return Linker::revDeleteLink( $query,
1838                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
1839                 }
1840         }
1841
1842         /**
1843          * Creates a (show/hide) link for deleting revisions/log entries
1844          *
1845          * @param $query Array: query parameters to be passed to link()
1846          * @param $restricted Boolean: set to true to use a <strong> instead of a <span>
1847          * @param $delete Boolean: set to true to use (show/hide) rather than (show)
1848          *
1849          * @return String: HTML <a> link to Special:Revisiondelete, wrapped in a
1850          * span to allow for customization of appearance with CSS
1851          */
1852         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
1853                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
1854                 $html = $delete ? wfMsgHtml( 'rev-delundel' ) : wfMsgHtml( 'rev-showdeleted' );
1855                 $tag = $restricted ? 'strong' : 'span';
1856                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
1857                 return Xml::tags( $tag, array( 'class' => 'mw-revdelundel-link' ), "($link)" );
1858         }
1859
1860         /**
1861          * Creates a dead (show/hide) link for deleting revisions/log entries
1862          *
1863          * @param $delete Boolean: set to true to use (show/hide) rather than (show)
1864          *
1865          * @return string HTML text wrapped in a span to allow for customization
1866          * of appearance with CSS
1867          */
1868         public static function revDeleteLinkDisabled( $delete = true ) {
1869                 $html = $delete ? wfMsgHtml( 'rev-delundel' ) : wfMsgHtml( 'rev-showdeleted' );
1870                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), "($html)" );
1871         }
1872
1873         /* Deprecated methods */
1874
1875         /**
1876          * @deprecated since 1.16 Use link()
1877          *
1878          * This function is a shortcut to makeBrokenLinkObj(Title::newFromText($title),...). Do not call
1879          * it if you already have a title object handy. See makeBrokenLinkObj for further documentation.
1880          *
1881          * @param $title String: The text of the title
1882          * @param $text String: Link text
1883          * @param $query String: Optional query part
1884          * @param $trail String: Optional trail. Alphabetic characters at the start of this string will
1885          *               be included in the link text. Other characters will be appended after
1886          *               the end of the link.
1887          */
1888         static function makeBrokenLink( $title, $text = '', $query = '', $trail = '' ) {
1889                 wfDeprecated( __METHOD__, '1.16' );
1890
1891                 $nt = Title::newFromText( $title );
1892                 if ( $nt instanceof Title ) {
1893                         return self::makeBrokenLinkObj( $nt, $text, $query, $trail );
1894                 } else {
1895                         wfDebug( 'Invalid title passed to self::makeBrokenLink(): "' . $title . "\"\n" );
1896                         return $text == '' ? $title : $text;
1897                 }
1898         }
1899
1900         /**
1901          * @deprecated since 1.16 Use link()
1902          *
1903          * Make a link for a title which may or may not be in the database. If you need to
1904          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
1905          * call to this will result in a DB query.
1906          *
1907          * @param $nt     Title: the title object to make the link from, e.g. from
1908          *                      Title::newFromText.
1909          * @param $text  String: link text
1910          * @param $query String: optional query part
1911          * @param $trail String: optional trail. Alphabetic characters at the start of this string will
1912          *                      be included in the link text. Other characters will be appended after
1913          *                      the end of the link.
1914          * @param $prefix String: optional prefix. As trail, only before instead of after.
1915          */
1916         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1917                 # wfDeprecated( __METHOD__, '1.16' ); // See r105985 and it's revert. Somewhere still used.
1918
1919                 wfProfileIn( __METHOD__ );
1920                 $query = wfCgiToArray( $query );
1921                 list( $inside, $trail ) = self::splitTrail( $trail );
1922                 if ( $text === '' ) {
1923                         $text = self::linkText( $nt );
1924                 }
1925
1926                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
1927
1928                 wfProfileOut( __METHOD__ );
1929                 return $ret;
1930         }
1931
1932         /**
1933          * @deprecated since 1.16 Use link()
1934          *
1935          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
1936          * it doesn't have to do a database query. It's also valid for interwiki titles and special
1937          * pages.
1938          *
1939          * @param $title  Title object of target page
1940          * @param $text   String: text to replace the title
1941          * @param $query  String: link target
1942          * @param $trail  String: text after link
1943          * @param $prefix String: text before link text
1944          * @param $aprops String: extra attributes to the a-element
1945          * @param $style  String: style to apply - if empty, use getInternalLinkAttributesObj instead
1946          * @return the a-element
1947          */
1948         static function makeKnownLinkObj(
1949                 $title, $text = '', $query = '', $trail = '', $prefix = '' , $aprops = '', $style = ''
1950         ) {
1951                 # wfDeprecated( __METHOD__, '1.16' ); // See r105985 and it's revert. Somewhere still used.
1952
1953                 wfProfileIn( __METHOD__ );
1954
1955                 if ( $text == '' ) {
1956                         $text = self::linkText( $title );
1957                 }
1958                 $attribs = Sanitizer::mergeAttributes(
1959                         Sanitizer::decodeTagAttributes( $aprops ),
1960                         Sanitizer::decodeTagAttributes( $style )
1961                 );
1962                 $query = wfCgiToArray( $query );
1963                 list( $inside, $trail ) = self::splitTrail( $trail );
1964
1965                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
1966                         array( 'known', 'noclasses' ) ) . $trail;
1967
1968                 wfProfileOut( __METHOD__ );
1969                 return $ret;
1970         }
1971
1972         /**
1973          * @deprecated since 1.16 Use link()
1974          *
1975          * Make a red link to the edit page of a given title.
1976          *
1977          * @param $title Title object of the target page
1978          * @param $text  String: Link text
1979          * @param $query String: Optional query part
1980          * @param $trail String: Optional trail. Alphabetic characters at the start of this string will
1981          *                      be included in the link text. Other characters will be appended after
1982          *                      the end of the link.
1983          * @param $prefix String: Optional prefix
1984          */
1985         static function makeBrokenLinkObj( $title, $text = '', $query = '', $trail = '', $prefix = '' ) {
1986                 wfDeprecated( __METHOD__, '1.16' );
1987
1988                 wfProfileIn( __METHOD__ );
1989
1990                 list( $inside, $trail ) = self::splitTrail( $trail );
1991                 if ( $text === '' ) {
1992                         $text = self::linkText( $title );
1993                 }
1994
1995                 $ret = self::link( $title, "$prefix$text$inside", array(),
1996                         wfCgiToArray( $query ), 'broken' ) . $trail;
1997
1998                 wfProfileOut( __METHOD__ );
1999                 return $ret;
2000         }
2001
2002         /**
2003          * @deprecated since 1.16 Use link()
2004          *
2005          * Make a coloured link.
2006          *
2007          * @param $nt Title object of the target page
2008          * @param $colour Integer: colour of the link
2009          * @param $text   String:  link text
2010          * @param $query  String:  optional query part
2011          * @param $trail  String:  optional trail. Alphabetic characters at the start of this string will
2012          *                      be included in the link text. Other characters will be appended after
2013          *                      the end of the link.
2014          * @param $prefix String: Optional prefix
2015          */
2016         static function makeColouredLinkObj( $nt, $colour, $text = '', $query = '', $trail = '', $prefix = '' ) {
2017                 wfDeprecated( __METHOD__, '1.16' );
2018
2019                 if ( $colour != '' ) {
2020                         $style = self::getInternalLinkAttributesObj( $nt, $text, $colour );
2021                 } else {
2022                         $style = '';
2023                 }
2024                 return self::makeKnownLinkObj( $nt, $text, $query, $trail, $prefix, '', $style );
2025         }
2026
2027         /**
2028          * Returns the attributes for the tooltip and access key.
2029          */
2030         public static function tooltipAndAccesskeyAttribs( $name ) {
2031                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2032                 # no attribute" instead of "output '' as value for attribute", this
2033                 # would be three lines.
2034                 $attribs = array(
2035                         'title' => self::titleAttrib( $name, 'withaccess' ),
2036                         'accesskey' => self::accesskey( $name )
2037                 );
2038                 if ( $attribs['title'] === false ) {
2039                         unset( $attribs['title'] );
2040                 }
2041                 if ( $attribs['accesskey'] === false ) {
2042                         unset( $attribs['accesskey'] );
2043                 }
2044                 return $attribs;
2045         }
2046
2047         /**
2048          * Returns raw bits of HTML, use titleAttrib()
2049          */
2050         public static function tooltip( $name, $options = null ) {
2051                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2052                 # no attribute" instead of "output '' as value for attribute", this
2053                 # would be two lines.
2054                 $tooltip = self::titleAttrib( $name, $options );
2055                 if ( $tooltip === false ) {
2056                         return '';
2057                 }
2058                 return Xml::expandAttributes( array(
2059                         'title' => $tooltip
2060                 ) );
2061         }
2062 }
2063
2064 /**
2065  * @since 1.18
2066  */
2067 class DummyLinker {
2068
2069         /**
2070          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2071          * into static calls to the new Linker for backwards compatibility.
2072          *
2073          * @param $fname String Name of called method
2074          * @param $args Array Arguments to the method
2075          */
2076         public function __call( $fname, $args ) {
2077                 return call_user_func_array( array( 'Linker', $fname ), $args );
2078         }
2079 }