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