includes/Linker.php

   1 <?php
   2 /**
   3  * Methods to make links and related items.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Some internal bits split of from Skin.php. These functions are used
  25  * for primarily page content: links, embedded images, table of contents. Links
  26  * are also used in the skin.
  27  *
  28  * @todo: turn this into a legacy interface for HtmlPageLinkRenderer and similar services.
  29  *
  30  * @ingroup Skins
  31  */
  32 class Linker {
  33         /**
  34          * Flags for userToolLinks()
  35          */
  36         const TOOL_LINKS_NOBLOCK = 1;
  37         const TOOL_LINKS_EMAIL = 2;
  38
  39         /**
  40          * Get the appropriate HTML attributes to add to the "a" element of an
  41          * external link, as created by [wikisyntax].
  42          *
  43          * @param string $class The contents of the class attribute; if an empty
  44          *   string is passed, which is the default value, defaults to 'external'.
  45          * @return string
  46          * @deprecated since 1.18 Just pass the external class directly to something
  47          *   using Html::expandAttributes.
  48          */
  49         static function getExternalLinkAttributes( $class = 'external' ) {
  50                 wfDeprecated( __METHOD__, '1.18' );
  51                 return self::getLinkAttributesInternal( '', $class );
  52         }
  53
  54         /**
  55          * Get the appropriate HTML attributes to add to the "a" element of an interwiki link.
  56          *
  57          * @param string $title The title text for the link, URL-encoded (???) but
  58          *   not HTML-escaped
  59          * @param string $unused Unused
  60          * @param string $class The contents of the class attribute; if an empty
  61          *   string is passed, which is the default value, defaults to 'external'.
  62          * @return string
  63          */
  64         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  65                 global $wgContLang;
  66
  67                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  68                 # getExternalLinkAttributes, why?
  69                 $title = urldecode( $title );
  70                 $title = $wgContLang->checkTitleEncoding( $title );
  71                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  72
  73                 return self::getLinkAttributesInternal( $title, $class );
  74         }
  75
  76         /**
  77          * Get the appropriate HTML attributes to add to the "a" element of an internal link.
  78          *
  79          * @param string $title The title text for the link, URL-encoded (???) but
  80          *   not HTML-escaped
  81          * @param string $unused Unused
  82          * @param string $class The contents of the class attribute, default none
  83          * @return string
  84          */
  85         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  86                 $title = urldecode( $title );
  87                 $title = str_replace( '_', ' ', $title );
  88                 return self::getLinkAttributesInternal( $title, $class );
  89         }
  90
  91         /**
  92          * Get the appropriate HTML attributes to add to the "a" element of an internal
  93          * link, given the Title object for the page we want to link to.
  94          *
  95          * @param Title $nt
  96          * @param string $unused Unused
  97          * @param string $class The contents of the class attribute, default none
  98          * @param string|bool $title Optional (unescaped) string to use in the title
  99          *   attribute; if false, default to the name of the page we're linking to
 100          * @return string
 101          */
 102         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
 103                 if ( $title === false ) {
 104                         $title = $nt->getPrefixedText();
 105                 }
 106                 return self::getLinkAttributesInternal( $title, $class );
 107         }
 108
 109         /**
 110          * Common code for getLinkAttributesX functions
 111          *
 112          * @param string $title
 113          * @param string $class
 114          *
 115          * @return string
 116          */
 117         private static function getLinkAttributesInternal( $title, $class ) {
 118                 $title = htmlspecialchars( $title );
 119                 $class = htmlspecialchars( $class );
 120                 $r = '';
 121                 if ( $class != '' ) {
 122                         $r .= " class=\"$class\"";
 123                 }
 124                 if ( $title != '' ) {
 125                         $r .= " title=\"$title\"";
 126                 }
 127                 return $r;
 128         }
 129
 130         /**
 131          * Return the CSS colour of a known link
 132          *
 133          * @param Title $t
 134          * @param int $threshold User defined threshold
 135          * @return string CSS class
 136          */
 137         public static function getLinkColour( $t, $threshold ) {
 138                 $colour = '';
 139                 if ( $t->isRedirect() ) {
 140                         # Page is a redirect
 141                         $colour = 'mw-redirect';
 142                 } elseif ( $threshold > 0 && $t->isContentPage() &&
 143                         $t->exists() && $t->getLength() < $threshold
 144                 ) {
 145                         # Page is a stub
 146                         $colour = 'stub';
 147                 }
 148                 return $colour;
 149         }
 150
 151         /**
 152          * This function returns an HTML link to the given target.  It serves a few
 153          * purposes:
 154          *   1) If $target is a Title, the correct URL to link to will be figured
 155          *      out automatically.
 156          *   2) It automatically adds the usual classes for various types of link
 157          *      targets: "new" for red links, "stub" for short articles, etc.
 158          *   3) It escapes all attribute values safely so there's no risk of XSS.
 159          *   4) It provides a default tooltip if the target is a Title (the page
 160          *      name of the target).
 161          * link() replaces the old functions in the makeLink() family.
 162          *
 163          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 164          *
 165          * @param Title $target Can currently only be a Title, but this may
 166          *   change to support Images, literal URLs, etc.
 167          * @param string $html The HTML contents of the <a> element, i.e.,
 168          *   the link text.  This is raw HTML and will not be escaped.  If null,
 169          *   defaults to the prefixed text of the Title; or if the Title is just a
 170          *   fragment, the contents of the fragment.
 171          * @param array $customAttribs A key => value array of extra HTML attributes,
 172          *   such as title and class.  (href is ignored.)  Classes will be
 173          *   merged with the default classes, while other attributes will replace
 174          *   default attributes.  All passed attribute values will be HTML-escaped.
 175          *   A false attribute value means to suppress that attribute.
 176          * @param array $query The query string to append to the URL
 177          *   you're linking to, in key => value array form.  Query keys and values
 178          *   will be URL-encoded.
 179          * @param string|array $options String or array of strings:
 180          *     'known': Page is known to exist, so don't check if it does.
 181          *     'broken': Page is known not to exist, so don't check if it does.
 182          *     'noclasses': Don't add any classes automatically (includes "new",
 183          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
 184          *       provided, if any, so you get a simple blue link with no funny i-
 185          *       cons.
 186          *     'forcearticlepath': Use the article path always, even with a querystring.
 187          *       Has compatibility issues on some setups, so avoid wherever possible.
 188          *     'http': Force a full URL with http:// as the scheme.
 189          *     'https': Force a full URL with https:// as the scheme.
 190          * @return string HTML <a> attribute
 191          */
 192         public static function link(
 193                 $target, $html = null, $customAttribs = array(), $query = array(), $options = array()
 194         ) {
 195                 wfProfileIn( __METHOD__ );
 196                 if ( !$target instanceof Title ) {
 197                         wfProfileOut( __METHOD__ );
 198                         return "<!-- ERROR -->$html";
 199                 }
 200
 201                 if ( is_string( $query ) ) {
 202                         // some functions withing core using this still hand over query strings
 203                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
 204                         $query = wfCgiToArray( $query );
 205                 }
 206                 $options = (array)$options;
 207
 208                 $dummy = new DummyLinker; // dummy linker instance for bc on the hooks
 209
 210                 $ret = null;
 211                 if ( !wfRunHooks( 'LinkBegin', array( $dummy, $target, &$html,
 212                 &$customAttribs, &$query, &$options, &$ret ) ) ) {
 213                         wfProfileOut( __METHOD__ );
 214                         return $ret;
 215                 }
 216
 217                 # Normalize the Title if it's a special page
 218                 $target = self::normaliseSpecialPage( $target );
 219
 220                 # If we don't know whether the page exists, let's find out.
 221                 wfProfileIn( __METHOD__ . '-checkPageExistence' );
 222                 if ( !in_array( 'known', $options ) and !in_array( 'broken', $options ) ) {
 223                         if ( $target->isKnown() ) {
 224                                 $options[] = 'known';
 225                         } else {
 226                                 $options[] = 'broken';
 227                         }
 228                 }
 229                 wfProfileOut( __METHOD__ . '-checkPageExistence' );
 230
 231                 $oldquery = array();
 232                 if ( in_array( "forcearticlepath", $options ) && $query ) {
 233                         $oldquery = $query;
 234                         $query = array();
 235                 }
 236
 237                 # Note: we want the href attribute first, for prettiness.
 238                 $attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
 239                 if ( in_array( 'forcearticlepath', $options ) && $oldquery ) {
 240                         $attribs['href'] = wfAppendQuery( $attribs['href'], $oldquery );
 241                 }
 242
 243                 $attribs = array_merge(
 244                         $attribs,
 245                         self::linkAttribs( $target, $customAttribs, $options )
 246                 );
 247                 if ( is_null( $html ) ) {
 248                         $html = self::linkText( $target );
 249                 }
 250
 251                 $ret = null;
 252                 if ( wfRunHooks( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
 253                         $ret = Html::rawElement( 'a', $attribs, $html );
 254                 }
 255
 256                 wfProfileOut( __METHOD__ );
 257                 return $ret;
 258         }
 259
 260         /**
 261          * Identical to link(), except $options defaults to 'known'.
 262          * @return string
 263          */
 264         public static function linkKnown(
 265                 $target, $html = null, $customAttribs = array(),
 266                 $query = array(), $options = array( 'known', 'noclasses' )
 267         ) {
 268                 return self::link( $target, $html, $customAttribs, $query, $options );
 269         }
 270
 271         /**
 272          * Returns the Url used to link to a Title
 273          *
 274          * @param Title $target
 275          * @param array $query query parameters
 276          * @param array $options
 277          * @return string
 278          */
 279         private static function linkUrl( $target, $query, $options ) {
 280                 wfProfileIn( __METHOD__ );
 281                 # We don't want to include fragments for broken links, because they
 282                 # generally make no sense.
 283                 if ( in_array( 'broken', $options ) && $target->hasFragment() ) {
 284                         $target = clone $target;
 285                         $target->setFragment( '' );
 286                 }
 287
 288                 # If it's a broken link, add the appropriate query pieces, unless
 289                 # there's already an action specified, or unless 'edit' makes no sense
 290                 # (i.e., for a nonexistent special page).
 291                 if ( in_array( 'broken', $options ) && empty( $query['action'] )
 292                         && !$target->isSpecialPage() ) {
 293                         $query['action'] = 'edit';
 294                         $query['redlink'] = '1';
 295                 }
 296
 297                 if ( in_array( 'http', $options ) ) {
 298                         $proto = PROTO_HTTP;
 299                 } elseif ( in_array( 'https', $options ) ) {
 300                         $proto = PROTO_HTTPS;
 301                 } else {
 302                         $proto = PROTO_RELATIVE;
 303                 }
 304
 305                 $ret = $target->getLinkURL( $query, false, $proto );
 306                 wfProfileOut( __METHOD__ );
 307                 return $ret;
 308         }
 309
 310         /**
 311          * Returns the array of attributes used when linking to the Title $target
 312          *
 313          * @param Title $target
 314          * @param array $attribs
 315          * @param array $options
 316          *
 317          * @return array
 318          */
 319         private static function linkAttribs( $target, $attribs, $options ) {
 320                 wfProfileIn( __METHOD__ );
 321                 global $wgUser;
 322                 $defaults = array();
 323
 324                 if ( !in_array( 'noclasses', $options ) ) {
 325                         wfProfileIn( __METHOD__ . '-getClasses' );
 326                         # Now build the classes.
 327                         $classes = array();
 328
 329                         if ( in_array( 'broken', $options ) ) {
 330                                 $classes[] = 'new';
 331                         }
 332
 333                         if ( $target->isExternal() ) {
 334                                 $classes[] = 'extiw';
 335                         }
 336
 337                         if ( !in_array( 'broken', $options ) ) { # Avoid useless calls to LinkCache (see r50387)
 338                                 $colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
 339                                 if ( $colour !== '' ) {
 340                                         $classes[] = $colour; # mw-redirect or stub
 341                                 }
 342                         }
 343                         if ( $classes != array() ) {
 344                                 $defaults['class'] = implode( ' ', $classes );
 345                         }
 346                         wfProfileOut( __METHOD__ . '-getClasses' );
 347                 }
 348
 349                 # Get a default title attribute.
 350                 if ( $target->getPrefixedText() == '' ) {
 351                         # A link like [[#Foo]].  This used to mean an empty title
 352                         # attribute, but that's silly.  Just don't output a title.
 353                 } elseif ( in_array( 'known', $options ) ) {
 354                         $defaults['title'] = $target->getPrefixedText();
 355                 } else {
 356                         $defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )->text();
 357                 }
 358
 359                 # Finally, merge the custom attribs with the default ones, and iterate
 360                 # over that, deleting all "false" attributes.
 361                 $ret = array();
 362                 $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
 363                 foreach ( $merged as $key => $val ) {
 364                         # A false value suppresses the attribute, and we don't want the
 365                         # href attribute to be overridden.
 366                         if ( $key != 'href' and $val !== false ) {
 367                                 $ret[$key] = $val;
 368                         }
 369                 }
 370                 wfProfileOut( __METHOD__ );
 371                 return $ret;
 372         }
 373
 374         /**
 375          * Default text of the links to the Title $target
 376          *
 377          * @param Title $target
 378          *
 379          * @return string
 380          */
 381         private static function linkText( $target ) {
 382                 // We might be passed a non-Title by make*LinkObj().  Fail gracefully.
 383                 if ( !$target instanceof Title ) {
 384                         return '';
 385                 }
 386
 387                 // If the target is just a fragment, with no title, we return the fragment
 388                 // text.  Otherwise, we return the title text itself.
 389                 if ( $target->getPrefixedText() === '' && $target->hasFragment() ) {
 390                         return htmlspecialchars( $target->getFragment() );
 391                 }
 392
 393                 return htmlspecialchars( $target->getPrefixedText() );
 394         }
 395
 396         /**
 397          * Make appropriate markup for a link to the current article. This is
 398          * currently rendered as the bold link text. The calling sequence is the
 399          * same as the other make*LinkObj static functions, despite $query not
 400          * being used.
 401          *
 402          * @param Title $nt
 403          * @param string $html [optional]
 404          * @param string $query [optional]
 405          * @param string $trail [optional]
 406          * @param string $prefix [optional]
 407          *
 408          * @return string
 409          */
 410         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 411                 if ( $html == '' ) {
 412                         $html = htmlspecialchars( $nt->getPrefixedText() );
 413                 }
 414                 list( $inside, $trail ) = self::splitTrail( $trail );
 415                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 416         }
 417
 418         /**
 419          * Get a message saying that an invalid title was encountered.
 420          * This should be called after a method like Title::makeTitleSafe() returned
 421          * a value indicating that the title object is invalid.
 422          *
 423          * @param IContextSource $context Context to use to get the messages
 424          * @param int $namespace Namespace number
 425          * @param string $title Text of the title, without the namespace part
 426          * @return string
 427          */
 428         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 429                 global $wgContLang;
 430
 431                 // First we check whether the namespace exists or not.
 432                 if ( MWNamespace::exists( $namespace ) ) {
 433                         if ( $namespace == NS_MAIN ) {
 434                                 $name = $context->msg( 'blanknamespace' )->text();
 435                         } else {
 436                                 $name = $wgContLang->getFormattedNsText( $namespace );
 437                         }
 438                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 439                 } else {
 440                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 441                 }
 442         }
 443
 444         /**
 445          * @param Title $title
 446          * @return Title
 447          */
 448         static function normaliseSpecialPage( Title $title ) {
 449                 if ( $title->isSpecialPage() ) {
 450                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 451                         if ( !$name ) {
 452                                 return $title;
 453                         }
 454                         $ret = SpecialPage::getTitleFor( $name, $subpage, $title->getFragment() );
 455                         return $ret;
 456                 } else {
 457                         return $title;
 458                 }
 459         }
 460
 461         /**
 462          * Returns the filename part of an url.
 463          * Used as alternative text for external images.
 464          *
 465          * @param string $url
 466          *
 467          * @return string
 468          */
 469         private static function fnamePart( $url ) {
 470                 $basename = strrchr( $url, '/' );
 471                 if ( false === $basename ) {
 472                         $basename = $url;
 473                 } else {
 474                         $basename = substr( $basename, 1 );
 475                 }
 476                 return $basename;
 477         }
 478
 479         /**
 480          * Return the code for images which were added via external links,
 481          * via Parser::maybeMakeExternalImage().
 482          *
 483          * @param string $url
 484          * @param string $alt
 485          *
 486          * @return string
 487          */
 488         public static function makeExternalImage( $url, $alt = '' ) {
 489                 if ( $alt == '' ) {
 490                         $alt = self::fnamePart( $url );
 491                 }
 492                 $img = '';
 493                 $success = wfRunHooks( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
 494                 if ( !$success ) {
 495                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 496                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 497                         return $img;
 498                 }
 499                 return Html::element( 'img',
 500                         array(
 501                                 'src' => $url,
 502                                 'alt' => $alt ) );
 503         }
 504
 505         /**
 506          * Given parameters derived from [[Image:Foo|options...]], generate the
 507          * HTML that that syntax inserts in the page.
 508          *
 509          * @param Parser $parser
 510          * @param Title $title Title object of the file (not the currently viewed page)
 511          * @param File $file File object, or false if it doesn't exist
 512          * @param array $frameParams Associative array of parameters external to the media handler.
 513          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 514          *     will often be false.
 515          *          thumbnail       If present, downscale and frame
 516          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 517          *          framed          Shows image in original size in a frame
 518          *          frameless       Downscale but don't frame
 519          *          upright         If present, tweak default sizes for portrait orientation
 520          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 521          *          border          If present, show a border around the image
 522          *          align           Horizontal alignment (left, right, center, none)
 523          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 524          *                          bottom, text-bottom)
 525          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 526          *          class           HTML for image classes. Plain text.
 527          *          caption         HTML for image caption.
 528          *          link-url        URL to link to
 529          *          link-title      Title object to link to
 530          *          link-target     Value for the target attribute, only with link-url
 531          *          no-link         Boolean, suppress description link
 532          *
 533          * @param array $handlerParams Associative array of media handler parameters, to be passed
 534          *       to transform(). Typical keys are "width" and "page".
 535          * @param string|bool $time Timestamp of the file, set as false for current
 536          * @param string $query Query params for desc url
 537          * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
 538          * @since 1.20
 539          * @return string HTML for an image, with links, wrappers, etc.
 540          */
 541         public static function makeImageLink( /*Parser*/ $parser, Title $title,
 542                 $file, $frameParams = array(), $handlerParams = array(), $time = false,
 543                 $query = "", $widthOption = null
 544         ) {
 545                 $res = null;
 546                 $dummy = new DummyLinker;
 547                 if ( !wfRunHooks( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
 548                         &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
 549                         return $res;
 550                 }
 551
 552                 if ( $file && !$file->allowInlineDisplay() ) {
 553                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 554                         return self::link( $title );
 555                 }
 556
 557                 // Shortcuts
 558                 $fp =& $frameParams;
 559                 $hp =& $handlerParams;
 560
 561                 // Clean up parameters
 562                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 563                 if ( !isset( $fp['align'] ) ) {
 564                         $fp['align'] = '';
 565                 }
 566                 if ( !isset( $fp['alt'] ) ) {
 567                         $fp['alt'] = '';
 568                 }
 569                 if ( !isset( $fp['title'] ) ) {
 570                         $fp['title'] = '';
 571                 }
 572                 if ( !isset( $fp['class'] ) ) {
 573                         $fp['class'] = '';
 574                 }
 575
 576                 $prefix = $postfix = '';
 577
 578                 if ( 'center' == $fp['align'] ) {
 579                         $prefix = '<div class="center">';
 580                         $postfix = '</div>';
 581                         $fp['align'] = 'none';
 582                 }
 583                 if ( $file && !isset( $hp['width'] ) ) {
 584                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 585                                 // If its a vector image, and user only specifies height
 586                                 // we don't want it to be limited by its "normal" width.
 587                                 global $wgSVGMaxSize;
 588                                 $hp['width'] = $wgSVGMaxSize;
 589                         } else {
 590                                 $hp['width'] = $file->getWidth( $page );
 591                         }
 592
 593                         if ( isset( $fp['thumbnail'] )
 594                                 || isset( $fp['manualthumb'] )
 595                                 || isset( $fp['framed'] )
 596                                 || isset( $fp['frameless'] )
 597                                 || !$hp['width']
 598                         ) {
 599                                 global $wgThumbLimits, $wgThumbUpright;
 600
 601                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 602                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 603                                 }
 604
 605                                 // Reduce width for upright images when parameter 'upright' is used
 606                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 607                                         $fp['upright'] = $wgThumbUpright;
 608                                 }
 609
 610                                 // For caching health: If width scaled down due to upright
 611                                 // parameter, round to full __0 pixel to avoid the creation of a
 612                                 // lot of odd thumbs.
 613                                 $prefWidth = isset( $fp['upright'] ) ?
 614                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 615                                         $wgThumbLimits[$widthOption];
 616
 617                                 // Use width which is smaller: real image width or user preference width
 618                                 // Unless image is scalable vector.
 619                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 620                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 621                                         $hp['width'] = $prefWidth;
 622                                 }
 623                         }
 624                 }
 625
 626                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 627                         # Create a thumbnail. Alignment depends on the writing direction of
 628                         # the page content language (right-aligned for LTR languages,
 629                         # left-aligned for RTL languages)
 630                         #
 631                         # If a thumbnail width has not been provided, it is set
 632                         # to the default user option as specified in Language*.php
 633                         if ( $fp['align'] == '' ) {
 634                                 if ( $parser instanceof Parser ) {
 635                                         $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 636                                 } else {
 637                                         # backwards compatibility, remove with makeImageLink2()
 638                                         global $wgContLang;
 639                                         $fp['align'] = $wgContLang->alignEnd();
 640                                 }
 641                         }
 642                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 643                 }
 644
 645                 if ( $file && isset( $fp['frameless'] ) ) {
 646                         $srcWidth = $file->getWidth( $page );
 647                         # For "frameless" option: do not present an image bigger than the
 648                         # source (for bitmap-style images). This is the same behavior as the
 649                         # "thumb" option does it already.
 650                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 651                                 $hp['width'] = $srcWidth;
 652                         }
 653                 }
 654
 655                 if ( $file && isset( $hp['width'] ) ) {
 656                         # Create a resized image, without the additional thumbnail features
 657                         $thumb = $file->transform( $hp );
 658                 } else {
 659                         $thumb = false;
 660                 }
 661
 662                 if ( !$thumb ) {
 663                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 664                 } else {
 665                         self::processResponsiveImages( $file, $thumb, $hp );
 666                         $params = array(
 667                                 'alt' => $fp['alt'],
 668                                 'title' => $fp['title'],
 669                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 670                                 'img-class' => $fp['class'] );
 671                         if ( isset( $fp['border'] ) ) {
 672                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 673                         }
 674                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 675
 676                         $s = $thumb->toHtml( $params );
 677                 }
 678                 if ( $fp['align'] != '' ) {
 679                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 680                 }
 681                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 682         }
 683
 684         /**
 685          * See makeImageLink()
 686          * When this function is removed, remove if( $parser instanceof Parser ) check there too
 687          * @deprecated since 1.20
 688          */
 689         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 690                 $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
 691                 return self::makeImageLink( null, $title, $file, $frameParams,
 692                         $handlerParams, $time, $query, $widthOption );
 693         }
 694
 695         /**
 696          * Get the link parameters for MediaTransformOutput::toHtml() from given
 697          * frame parameters supplied by the Parser.
 698          * @param array $frameParams The frame parameters
 699          * @param string $query An optional query string to add to description page links
 700          * @return array
 701          */
 702         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 703                 $mtoParams = array();
 704                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 705                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 706                         if ( isset( $frameParams['link-target'] ) ) {
 707                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 708                         }
 709                         if ( $parser ) {
 710                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 711                                 foreach ( $extLinkAttrs as $name => $val ) {
 712                                         // Currently could include 'rel' and 'target'
 713                                         $mtoParams['parser-extlink-' . $name] = $val;
 714                                 }
 715                         }
 716                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 717                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 718                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 719                         // No link
 720                 } else {
 721                         $mtoParams['desc-link'] = true;
 722                         $mtoParams['desc-query'] = $query;
 723                 }
 724                 return $mtoParams;
 725         }
 726
 727         /**
 728          * Make HTML for a thumbnail including image, border and caption
 729          * @param Title $title
 730          * @param File|bool $file File object or false if it doesn't exist
 731          * @param string $label
 732          * @param string $alt
 733          * @param string $align
 734          * @param array $params
 735          * @param bool $framed
 736          * @param string $manualthumb
 737          * @return string
 738          */
 739         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 740                 $align = 'right', $params = array(), $framed = false, $manualthumb = ""
 741         ) {
 742                 $frameParams = array(
 743                         'alt' => $alt,
 744                         'caption' => $label,
 745                         'align' => $align
 746                 );
 747                 if ( $framed ) {
 748                         $frameParams['framed'] = true;
 749                 }
 750                 if ( $manualthumb ) {
 751                         $frameParams['manualthumb'] = $manualthumb;
 752                 }
 753                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 754         }
 755
 756         /**
 757          * @param Title $title
 758          * @param File $file
 759          * @param array $frameParams
 760          * @param array $handlerParams
 761          * @param bool $time
 762          * @param string $query
 763          * @return string
 764          */
 765         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 766                 $handlerParams = array(), $time = false, $query = ""
 767         ) {
 768                 global $wgStylePath, $wgContLang;
 769                 $exists = $file && $file->exists();
 770
 771                 # Shortcuts
 772                 $fp =& $frameParams;
 773                 $hp =& $handlerParams;
 774
 775                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 776                 if ( !isset( $fp['align'] ) ) {
 777                         $fp['align'] = 'right';
 778                 }
 779                 if ( !isset( $fp['alt'] ) ) {
 780                         $fp['alt'] = '';
 781                 }
 782                 if ( !isset( $fp['title'] ) ) {
 783                         $fp['title'] = '';
 784                 }
 785                 if ( !isset( $fp['caption'] ) ) {
 786                         $fp['caption'] = '';
 787                 }
 788
 789                 if ( empty( $hp['width'] ) ) {
 790                         // Reduce width for upright images when parameter 'upright' is used
 791                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 792                 }
 793                 $thumb = false;
 794                 $noscale = false;
 795                 $manualthumb = false;
 796
 797                 if ( !$exists ) {
 798                         $outerWidth = $hp['width'] + 2;
 799                 } else {
 800                         if ( isset( $fp['manualthumb'] ) ) {
 801                                 # Use manually specified thumbnail
 802                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 803                                 if ( $manual_title ) {
 804                                         $manual_img = wfFindFile( $manual_title );
 805                                         if ( $manual_img ) {
 806                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 807                                                 $manualthumb = true;
 808                                         } else {
 809                                                 $exists = false;
 810                                         }
 811                                 }
 812                         } elseif ( isset( $fp['framed'] ) ) {
 813                                 // Use image dimensions, don't scale
 814                                 $thumb = $file->getUnscaledThumb( $hp );
 815                                 $noscale = true;
 816                         } else {
 817                                 # Do not present an image bigger than the source, for bitmap-style images
 818                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 819                                 $srcWidth = $file->getWidth( $page );
 820                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 821                                         $hp['width'] = $srcWidth;
 822                                 }
 823                                 $thumb = $file->transform( $hp );
 824                         }
 825
 826                         if ( $thumb ) {
 827                                 $outerWidth = $thumb->getWidth() + 2;
 828                         } else {
 829                                 $outerWidth = $hp['width'] + 2;
 830                         }
 831                 }
 832
 833                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 834                 # So we don't need to pass it here in $query. However, the URL for the
 835                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 836                 $url = $title->getLocalURL( $query );
 837                 if ( $page ) {
 838                         $url = wfAppendQuery( $url, array( 'page' => $page ) );
 839                 }
 840                 if ( $manualthumb
 841                         && !isset( $fp['link-title'] )
 842                         && !isset( $fp['link-url'] )
 843                         && !isset( $fp['no-link'] ) ) {
 844                         $fp['link-url'] = $url;
 845                 }
 846
 847                 $s = "<div class=\"thumb t{$fp['align']}\">"
 848                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 849
 850                 if ( !$exists ) {
 851                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 852                         $zoomIcon = '';
 853                 } elseif ( !$thumb ) {
 854                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 855                         $zoomIcon = '';
 856                 } else {
 857                         if ( !$noscale && !$manualthumb ) {
 858                                 self::processResponsiveImages( $file, $thumb, $hp );
 859                         }
 860                         $params = array(
 861                                 'alt' => $fp['alt'],
 862                                 'title' => $fp['title'],
 863                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
 864                                         ? $fp['class'] . ' '
 865                                         : '' ) . 'thumbimage'
 866                         );
 867                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 868                         $s .= $thumb->toHtml( $params );
 869                         if ( isset( $fp['framed'] ) ) {
 870                                 $zoomIcon = "";
 871                         } else {
 872                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 873                                         Html::rawElement( 'a', array(
 874                                                 'href' => $url,
 875                                                 'class' => 'internal',
 876                                                 'title' => wfMessage( 'thumbnail-more' )->text() ),
 877                                                 Html::element( 'img', array(
 878                                                         'src' => $wgStylePath . '/common/images/magnify-clip'
 879                                                                 . ( $wgContLang->isRTL() ? '-rtl' : '' ) . '.png',
 880                                                         'width' => 15,
 881                                                         'height' => 11,
 882                                                         'alt' => "" ) ) ) );
 883                         }
 884                 }
 885                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 886                 return str_replace( "\n", ' ', $s );
 887         }
 888
 889         /**
 890          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 891          * applicable.
 892          *
 893          * @param File $file
 894          * @param MediaTransformOutput $thumb
 895          * @param array $hp Image parameters
 896          */
 897         public static function processResponsiveImages( $file, $thumb, $hp ) {
 898                 global $wgResponsiveImages;
 899                 if ( $wgResponsiveImages ) {
 900                         $hp15 = $hp;
 901                         $hp15['width'] = round( $hp['width'] * 1.5 );
 902                         $hp20 = $hp;
 903                         $hp20['width'] = $hp['width'] * 2;
 904                         if ( isset( $hp['height'] ) ) {
 905                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 906                                 $hp20['height'] = $hp['height'] * 2;
 907                         }
 908
 909                         $thumb15 = $file->transform( $hp15 );
 910                         $thumb20 = $file->transform( $hp20 );
 911                         if ( $thumb15 && $thumb15->getUrl() !== $thumb->getUrl() ) {
 912                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 913                         }
 914                         if ( $thumb20 && $thumb20->getUrl() !== $thumb->getUrl() ) {
 915                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 916                         }
 917                 }
 918         }
 919
 920         /**
 921          * Make a "broken" link to an image
 922          *
 923          * @param Title $title
 924          * @param string $label Link label (plain text)
 925          * @param string $query Query string
 926          * @param string $unused1 Unused parameter kept for b/c
 927          * @param string $unused2 Unused parameter kept for b/c
 928          * @param bool $time A file of a certain timestamp was requested
 929          * @return string
 930          */
 931         public static function makeBrokenImageLinkObj( $title, $label = '',
 932                 $query = '', $unused1 = '', $unused2 = '', $time = false
 933         ) {
 934                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 935                 if ( ! $title instanceof Title ) {
 936                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 937                 }
 938                 wfProfileIn( __METHOD__ );
 939                 if ( $label == '' ) {
 940                         $label = $title->getPrefixedText();
 941                 }
 942                 $encLabel = htmlspecialchars( $label );
 943                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 944
 945                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 946                         && !$currentExists
 947                 ) {
 948                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 949
 950                         if ( $redir ) {
 951                                 wfProfileOut( __METHOD__ );
 952                                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 953                         }
 954
 955                         $href = self::getUploadUrl( $title, $query );
 956
 957                         wfProfileOut( __METHOD__ );
 958                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 959                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 960                                 $encLabel . '</a>';
 961                 }
 962
 963                 wfProfileOut( __METHOD__ );
 964                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 965         }
 966
 967         /**
 968          * Get the URL to upload a certain file
 969          *
 970          * @param Title $destFile Title object of the file to upload
 971          * @param string $query Urlencoded query string to prepend
 972          * @return string Urlencoded URL
 973          */
 974         protected static function getUploadUrl( $destFile, $query = '' ) {
 975                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 976                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 977                 if ( $query != '' ) {
 978                         $q .= '&' . $query;
 979                 }
 980
 981                 if ( $wgUploadMissingFileUrl ) {
 982                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 983                 } elseif ( $wgUploadNavigationUrl ) {
 984                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 985                 } else {
 986                         $upload = SpecialPage::getTitleFor( 'Upload' );
 987                         return $upload->getLocalURL( $q );
 988                 }
 989         }
 990
 991         /**
 992          * Create a direct link to a given uploaded file.
 993          *
 994          * @param Title $title
 995          * @param string $html Pre-sanitized HTML
 996          * @param string $time MW timestamp of file creation time
 997          * @return string HTML
 998          */
 999         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
1000                 $img = wfFindFile( $title, array( 'time' => $time ) );
1001                 return self::makeMediaLinkFile( $title, $img, $html );
1002         }
1003
1004         /**
1005          * Create a direct link to a given uploaded file.
1006          * This will make a broken link if $file is false.
1007          *
1008          * @param Title $title
1009          * @param File|bool $file File object or false
1010          * @param string $html Pre-sanitized HTML
1011          * @return string HTML
1012          *
1013          * @todo Handle invalid or missing images better.
1014          */
1015         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
1016                 if ( $file && $file->exists() ) {
1017                         $url = $file->getURL();
1018                         $class = 'internal';
1019                 } else {
1020                         $url = self::getUploadUrl( $title );
1021                         $class = 'new';
1022                 }
1023
1024                 $alt = $title->getText();
1025                 if ( $html == '' ) {
1026                         $html = $alt;
1027                 }
1028
1029                 $ret = '';
1030                 $attribs = array(
1031                         'href' => $url,
1032                         'class' => $class,
1033                         'title' => $alt
1034                 );
1035
1036                 if ( !wfRunHooks( 'LinkerMakeMediaLinkFile',
1037                         array( $title, $file, &$html, &$attribs, &$ret ) ) ) {
1038                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
1039                                 . "with url {$url} and text {$html} to {$ret}\n", true );
1040                         return $ret;
1041                 }
1042
1043                 return Html::rawElement( 'a', $attribs, $html );
1044         }
1045
1046         /**
1047          * Make a link to a special page given its name and, optionally,
1048          * a message key from the link text.
1049          * Usage example: Linker::specialLink( 'Recentchanges' )
1050          *
1051          * @param string $name
1052          * @param string $key
1053          * @return string
1054          */
1055         public static function specialLink( $name, $key = '' ) {
1056                 if ( $key == '' ) {
1057                         $key = strtolower( $name );
1058                 }
1059
1060                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
1061         }
1062
1063         /**
1064          * Make an external link
1065          * @param string $url URL to link to
1066          * @param string $text Text of link
1067          * @param bool $escape Do we escape the link text?
1068          * @param string $linktype Type of external link. Gets added to the classes
1069          * @param array $attribs Array of extra attributes to <a>
1070          * @param Title|null $title Title object used for title specific link attributes
1071          * @return string
1072          */
1073         public static function makeExternalLink( $url, $text, $escape = true,
1074                 $linktype = '', $attribs = array(), $title = null
1075         ) {
1076                 global $wgTitle;
1077                 $class = "external";
1078                 if ( $linktype ) {
1079                         $class .= " $linktype";
1080                 }
1081                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1082                         $class .= " {$attribs['class']}";
1083                 }
1084                 $attribs['class'] = $class;
1085
1086                 if ( $escape ) {
1087                         $text = htmlspecialchars( $text );
1088                 }
1089
1090                 if ( !$title ) {
1091                         $title = $wgTitle;
1092                 }
1093                 $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
1094                 $link = '';
1095                 $success = wfRunHooks( 'LinkerMakeExternalLink',
1096                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
1097                 if ( !$success ) {
1098                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
1099                                 . "with url {$url} and text {$text} to {$link}\n", true );
1100                         return $link;
1101                 }
1102                 $attribs['href'] = $url;
1103                 return Html::rawElement( 'a', $attribs, $text );
1104         }
1105
1106         /**
1107          * Make user link (or user contributions for unregistered users)
1108          * @param int $userId User id in database.
1109          * @param string $userName User name in database.
1110          * @param string $altUserName Text to display instead of the user name (optional)
1111          * @return string HTML fragment
1112          * @since 1.19 Method exists for a long time. $altUserName was added in 1.19.
1113          */
1114         public static function userLink( $userId, $userName, $altUserName = false ) {
1115                 $classes = 'mw-userlink';
1116                 if ( $userId == 0 ) {
1117                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1118                         if ( $altUserName === false ) {
1119                                 $altUserName = IP::prettifyIP( $userName );
1120                         }
1121                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
1122                 } else {
1123                         $page = Title::makeTitle( NS_USER, $userName );
1124                 }
1125
1126                 return self::link(
1127                         $page,
1128                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1129                         array( 'class' => $classes )
1130                 );
1131         }
1132
1133         /**
1134          * Generate standard user tool links (talk, contributions, block link, etc.)
1135          *
1136          * @param int $userId User identifier
1137          * @param string $userText User name or IP address
1138          * @param bool $redContribsWhenNoEdits Should the contributions link be
1139          *   red if the user has no edits?
1140          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
1141          *   and Linker::TOOL_LINKS_EMAIL).
1142          * @param int $edits User edit count (optional, for performance)
1143          * @return string HTML fragment
1144          */
1145         public static function userToolLinks(
1146                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1147         ) {
1148                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1149                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1150                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1151                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1152
1153                 $items = array();
1154                 if ( $talkable ) {
1155                         $items[] = self::userTalkLink( $userId, $userText );
1156                 }
1157                 if ( $userId ) {
1158                         // check if the user has an edit
1159                         $attribs = array();
1160                         if ( $redContribsWhenNoEdits ) {
1161                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1162                                         $user = User::newFromId( $userId );
1163                                         $edits = $user->getEditCount();
1164                                 }
1165                                 if ( $edits === 0 ) {
1166                                         $attribs['class'] = 'new';
1167                                 }
1168                         }
1169                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1170
1171                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1172                 }
1173                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1174                         $items[] = self::blockLink( $userId, $userText );
1175                 }
1176
1177                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1178                         $items[] = self::emailLink( $userId, $userText );
1179                 }
1180
1181                 wfRunHooks( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
1182
1183                 if ( $items ) {
1184                         return wfMessage( 'word-separator' )->plain()
1185                                 . '<span class="mw-usertoollinks">'
1186                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1187                                 . '</span>';
1188                 } else {
1189                         return '';
1190                 }
1191         }
1192
1193         /**
1194          * Alias for userToolLinks( $userId, $userText, true );
1195          * @param int $userId User identifier
1196          * @param string $userText User name or IP address
1197          * @param int $edits User edit count (optional, for performance)
1198          * @return string
1199          */
1200         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1201                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1202         }
1203
1204         /**
1205          * @param int $userId User id in database.
1206          * @param string $userText User name in database.
1207          * @return string HTML fragment with user talk link
1208          */
1209         public static function userTalkLink( $userId, $userText ) {
1210                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1211                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1212                 return $userTalkLink;
1213         }
1214
1215         /**
1216          * @param int $userId Userid
1217          * @param string $userText User name in database.
1218          * @return string HTML fragment with block link
1219          */
1220         public static function blockLink( $userId, $userText ) {
1221                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1222                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1223                 return $blockLink;
1224         }
1225
1226         /**
1227          * @param int $userId Userid
1228          * @param string $userText User name in database.
1229          * @return string HTML fragment with e-mail user link
1230          */
1231         public static function emailLink( $userId, $userText ) {
1232                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1233                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1234                 return $emailLink;
1235         }
1236
1237         /**
1238          * Generate a user link if the current user is allowed to view it
1239          * @param Revision $rev
1240          * @param bool $isPublic Show only if all users can see it
1241          * @return string HTML fragment
1242          */
1243         public static function revUserLink( $rev, $isPublic = false ) {
1244                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1245                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1246                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1247                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1248                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1249                 } else {
1250                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1251                 }
1252                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1253                         return '<span class="history-deleted">' . $link . '</span>';
1254                 }
1255                 return $link;
1256         }
1257
1258         /**
1259          * Generate a user tool link cluster if the current user is allowed to view it
1260          * @param Revision $rev
1261          * @param bool $isPublic Show only if all users can see it
1262          * @return string HTML
1263          */
1264         public static function revUserTools( $rev, $isPublic = false ) {
1265                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1266                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1267                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1268                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1269                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1270                         $link = self::userLink( $userId, $userText )
1271                                 . wfMessage( 'word-separator' )->plain()
1272                                 . self::userToolLinks( $userId, $userText );
1273                 } else {
1274                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1275                 }
1276                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1277                         return ' <span class="history-deleted">' . $link . '</span>';
1278                 }
1279                 return $link;
1280         }
1281
1282         /**
1283          * This function is called by all recent changes variants, by the page history,
1284          * and by the user contributions list. It is responsible for formatting edit
1285          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1286          * auto-generated comments (from section editing) and formats [[wikilinks]].
1287          *
1288          * @author Erik Moeller <moeller@scireview.de>
1289          *
1290          * Note: there's not always a title to pass to this function.
1291          * Since you can't set a default parameter for a reference, I've turned it
1292          * temporarily to a value pass. Should be adjusted further. --brion
1293          *
1294          * @param string $comment
1295          * @param Title|null $title Title object (to generate link to the section in autocomment) or null
1296          * @param bool $local Whether section links should refer to local page
1297          * @return mixed|string
1298          */
1299         public static function formatComment( $comment, $title = null, $local = false ) {
1300                 wfProfileIn( __METHOD__ );
1301
1302                 # Sanitize text a bit:
1303                 $comment = str_replace( "\n", " ", $comment );
1304                 # Allow HTML entities (for bug 13815)
1305                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1306
1307                 # Render autocomments and make links:
1308                 $comment = self::formatAutocomments( $comment, $title, $local );
1309                 $comment = self::formatLinksInComment( $comment, $title, $local );
1310
1311                 wfProfileOut( __METHOD__ );
1312                 return $comment;
1313         }
1314
1315         /** @var Title */
1316         private static $autocommentTitle;
1317
1318         /** @var bool Whether section links should refer to local page */
1319         private static $autocommentLocal;
1320
1321         /**
1322          * Converts autogenerated comments in edit summaries into section links.
1323          * The pattern for autogen comments is / * foo * /, which makes for
1324          * some nasty regex.
1325          * We look for all comments, match any text before and after the comment,
1326          * add a separator where needed and format the comment itself with CSS
1327          * Called by Linker::formatComment.
1328          *
1329          * @param string $comment Comment text
1330          * @param Title|null $title An optional title object used to links to sections
1331          * @param bool $local Whether section links should refer to local page
1332          * @return string Formatted comment
1333          */
1334         private static function formatAutocomments( $comment, $title = null, $local = false ) {
1335                 // Bah!
1336                 self::$autocommentTitle = $title;
1337                 self::$autocommentLocal = $local;
1338                 $comment = preg_replace_callback(
1339                         '!(.*)/\*\s*(.*?)\s*\*/(.*)!',
1340                         array( 'Linker', 'formatAutocommentsCallback' ),
1341                         $comment );
1342                 self::$autocommentTitle = null;
1343                 self::$autocommentLocal = null;
1344                 return $comment;
1345         }
1346
1347         /**
1348          * Helper function for Linker::formatAutocomments
1349          * @param array $match
1350          * @return string
1351          */
1352         private static function formatAutocommentsCallback( $match ) {
1353                 global $wgLang;
1354                 $title = self::$autocommentTitle;
1355                 $local = self::$autocommentLocal;
1356
1357                 $pre = $match[1];
1358                 $auto = $match[2];
1359                 $post = $match[3];
1360                 $comment = null;
1361                 wfRunHooks( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local ) );
1362                 if ( $comment === null ) {
1363                         $link = '';
1364                         if ( $title ) {
1365                                 $section = $auto;
1366
1367                                 # Remove links that a user may have manually put in the autosummary
1368                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1369                                 $section = str_replace( '[[:', '', $section );
1370                                 $section = str_replace( '[[', '', $section );
1371                                 $section = str_replace( ']]', '', $section );
1372
1373                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1374                                 if ( $local ) {
1375                                         $sectionTitle = Title::newFromText( '#' . $section );
1376                                 } else {
1377                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1378                                                 $title->getDBkey(), $section );
1379                                 }
1380                                 if ( $sectionTitle ) {
1381                                         $link = self::link( $sectionTitle,
1382                                                 $wgLang->getArrow(), array(), array(),
1383                                                 'noclasses' );
1384                                 } else {
1385                                         $link = '';
1386                                 }
1387                         }
1388                         if ( $pre ) {
1389                                 # written summary $presep autocomment (summary /* section */)
1390                                 $pre .= wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1391                         }
1392                         if ( $post ) {
1393                                 # autocomment $postsep written summary (/* section */ summary)
1394                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1395                         }
1396                         $auto = '<span class="autocomment">' . $auto . '</span>';
1397                         $comment = $pre . $link . $wgLang->getDirMark()
1398                                 . '<span dir="auto">' . $auto . $post . '</span>';
1399                 }
1400                 return $comment;
1401         }
1402
1403         /** @var Title */
1404         private static $commentContextTitle;
1405
1406         /** @var bool Whether section links should refer to local page */
1407         private static $commentLocal;
1408
1409         /**
1410          * Formats wiki links and media links in text; all other wiki formatting
1411          * is ignored
1412          *
1413          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1414          * @param string $comment Text to format links in
1415          * @param Title|null $title An optional title object used to links to sections
1416          * @param bool $local Whether section links should refer to local page
1417          * @return string
1418          */
1419         public static function formatLinksInComment( $comment, $title = null, $local = false ) {
1420                 self::$commentContextTitle = $title;
1421                 self::$commentLocal = $local;
1422                 $html = preg_replace_callback(
1423                         '/
1424                                 \[\[
1425                                 :? # ignore optional leading colon
1426                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1427                                 (?:\|
1428                                         # 2. a pipe-separated substring; only the last is captured
1429                                         # Stop matching at | and ]] without relying on backtracking.
1430                                         ((?:]?[^\]|])*+)
1431                                 )*
1432                                 \]\]
1433                                 ([^[]*) # 3. link trail (the text up until the next link)
1434                         /x',
1435                         array( 'Linker', 'formatLinksInCommentCallback' ),
1436                         $comment );
1437                 self::$commentContextTitle = null;
1438                 self::$commentLocal = null;
1439                 return $html;
1440         }
1441
1442         /**
1443          * @param array $match
1444          * @return mixed
1445          */
1446         protected static function formatLinksInCommentCallback( $match ) {
1447                 global $wgContLang;
1448
1449                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1450                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1451
1452                 $comment = $match[0];
1453
1454                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1455                 if ( strpos( $match[1], '%' ) !== false ) {
1456                         $match[1] = str_replace( array( '<', '>' ), array( '&lt;', '&gt;' ), rawurldecode( $match[1] ) );
1457                 }
1458
1459                 # Handle link renaming [[foo|text]] will show link as "text"
1460                 if ( $match[2] != "" ) {
1461                         $text = $match[2];
1462                 } else {
1463                         $text = $match[1];
1464                 }
1465                 $submatch = array();
1466                 $thelink = null;
1467                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1468                         # Media link; trail not supported.
1469                         $linkRegexp = '/\[\[(.*?)\]\]/';
1470                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1471                         if ( $title ) {
1472                                 $thelink = self::makeMediaLinkObj( $title, $text );
1473                         }
1474                 } else {
1475                         # Other kind of link
1476                         if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
1477                                 $trail = $submatch[1];
1478                         } else {
1479                                 $trail = "";
1480                         }
1481                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1482                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1483                                 $match[1] = substr( $match[1], 1 );
1484                         }
1485                         list( $inside, $trail ) = self::splitTrail( $trail );
1486
1487                         $linkText = $text;
1488                         $linkTarget = self::normalizeSubpageLink( self::$commentContextTitle,
1489                                 $match[1], $linkText );
1490
1491                         $target = Title::newFromText( $linkTarget );
1492                         if ( $target ) {
1493                                 if ( $target->getText() == '' && !$target->isExternal()
1494                                         && !self::$commentLocal && self::$commentContextTitle
1495                                 ) {
1496                                         $newTarget = clone ( self::$commentContextTitle );
1497                                         $newTarget->setFragment( '#' . $target->getFragment() );
1498                                         $target = $newTarget;
1499                                 }
1500                                 $thelink = self::link(
1501                                         $target,
1502                                         $linkText . $inside
1503                                 ) . $trail;
1504                         }
1505                 }
1506                 if ( $thelink ) {
1507                         // If the link is still valid, go ahead and replace it in!
1508                         $comment = preg_replace(
1509                                 $linkRegexp,
1510                                 StringUtils::escapeRegexReplacement( $thelink ),
1511                                 $comment,
1512                                 1
1513                         );
1514                 }
1515
1516                 return $comment;
1517         }
1518
1519         /**
1520          * @param Title $contextTitle
1521          * @param string $target
1522          * @param string $text
1523          * @return string
1524          */
1525         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1526                 # Valid link forms:
1527                 # Foobar -- normal
1528                 # :Foobar -- override special treatment of prefix (images, language links)
1529                 # /Foobar -- convert to CurrentPage/Foobar
1530                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1531                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1532                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1533
1534                 wfProfileIn( __METHOD__ );
1535                 $ret = $target; # default return value is no change
1536
1537                 # Some namespaces don't allow subpages,
1538                 # so only perform processing if subpages are allowed
1539                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1540                         $hash = strpos( $target, '#' );
1541                         if ( $hash !== false ) {
1542                                 $suffix = substr( $target, $hash );
1543                                 $target = substr( $target, 0, $hash );
1544                         } else {
1545                                 $suffix = '';
1546                         }
1547                         # bug 7425
1548                         $target = trim( $target );
1549                         # Look at the first character
1550                         if ( $target != '' && $target[0] === '/' ) {
1551                                 # / at end means we don't want the slash to be shown
1552                                 $m = array();
1553                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1554                                 if ( $trailingSlashes ) {
1555                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1556                                 } else {
1557                                         $noslash = substr( $target, 1 );
1558                                 }
1559
1560                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1561                                 if ( $text === '' ) {
1562                                         $text = $target . $suffix;
1563                                 } # this might be changed for ugliness reasons
1564                         } else {
1565                                 # check for .. subpage backlinks
1566                                 $dotdotcount = 0;
1567                                 $nodotdot = $target;
1568                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1569                                         ++$dotdotcount;
1570                                         $nodotdot = substr( $nodotdot, 3 );
1571                                 }
1572                                 if ( $dotdotcount > 0 ) {
1573                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1574                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1575                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1576                                                 # / at the end means don't show full path
1577                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1578                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1579                                                         if ( $text === '' ) {
1580                                                                 $text = $nodotdot . $suffix;
1581                                                         }
1582                                                 }
1583                                                 $nodotdot = trim( $nodotdot );
1584                                                 if ( $nodotdot != '' ) {
1585                                                         $ret .= '/' . $nodotdot;
1586                                                 }
1587                                                 $ret .= $suffix;
1588                                         }
1589                                 }
1590                         }
1591                 }
1592
1593                 wfProfileOut( __METHOD__ );
1594                 return $ret;
1595         }
1596
1597         /**
1598          * Wrap a comment in standard punctuation and formatting if
1599          * it's non-empty, otherwise return empty string.
1600          *
1601          * @param string $comment
1602          * @param Title|null $title Title object (to generate link to section in autocomment) or null
1603          * @param bool $local Whether section links should refer to local page
1604          *
1605          * @return string
1606          */
1607         public static function commentBlock( $comment, $title = null, $local = false ) {
1608                 // '*' used to be the comment inserted by the software way back
1609                 // in antiquity in case none was provided, here for backwards
1610                 // compatibility, acc. to brion -ævar
1611                 if ( $comment == '' || $comment == '*' ) {
1612                         return '';
1613                 } else {
1614                         $formatted = self::formatComment( $comment, $title, $local );
1615                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1616                         return " <span class=\"comment\">$formatted</span>";
1617                 }
1618         }
1619
1620         /**
1621          * Wrap and format the given revision's comment block, if the current
1622          * user is allowed to view it.
1623          *
1624          * @param Revision $rev
1625          * @param bool $local Whether section links should refer to local page
1626          * @param bool $isPublic Show only if all users can see it
1627          * @return string HTML fragment
1628          */
1629         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1630                 if ( $rev->getRawComment() == "" ) {
1631                         return "";
1632                 }
1633                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1634                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1635                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1636                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1637                                 $rev->getTitle(), $local );
1638                 } else {
1639                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1640                 }
1641                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1642                         return " <span class=\"history-deleted\">$block</span>";
1643                 }
1644                 return $block;
1645         }
1646
1647         /**
1648          * @param int $size
1649          * @return string
1650          */
1651         public static function formatRevisionSize( $size ) {
1652                 if ( $size == 0 ) {
1653                         $stxt = wfMessage( 'historyempty' )->escaped();
1654                 } else {
1655                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1656                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1657                 }
1658                 return "<span class=\"history-size\">$stxt</span>";
1659         }
1660
1661         /**
1662          * Add another level to the Table of Contents
1663          *
1664          * @return string
1665          */
1666         public static function tocIndent() {
1667                 return "\n<ul>";
1668         }
1669
1670         /**
1671          * Finish one or more sublevels on the Table of Contents
1672          *
1673          * @param int $level
1674          * @return string
1675          */
1676         public static function tocUnindent( $level ) {
1677                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1678         }
1679
1680         /**
1681          * parameter level defines if we are on an indentation level
1682          *
1683          * @param string $anchor
1684          * @param string $tocline
1685          * @param string $tocnumber
1686          * @param string $level
1687          * @param string|bool $sectionIndex
1688          * @return string
1689          */
1690         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1691                 $classes = "toclevel-$level";
1692                 if ( $sectionIndex !== false ) {
1693                         $classes .= " tocsection-$sectionIndex";
1694                 }
1695                 return "\n<li class=\"$classes\"><a href=\"#" .
1696                         $anchor . '"><span class="tocnumber">' .
1697                         $tocnumber . '</span> <span class="toctext">' .
1698                         $tocline . '</span></a>';
1699         }
1700
1701         /**
1702          * End a Table Of Contents line.
1703          * tocUnindent() will be used instead if we're ending a line below
1704          * the new level.
1705          * @return string
1706          */
1707         public static function tocLineEnd() {
1708                 return "</li>\n";
1709         }
1710
1711         /**
1712          * Wraps the TOC in a table and provides the hide/collapse javascript.
1713          *
1714          * @param string $toc Html of the Table Of Contents
1715          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1716          * @return string Full html of the TOC
1717          */
1718         public static function tocList( $toc, $lang = false ) {
1719                 $lang = wfGetLangObj( $lang );
1720                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1721
1722                 return '<div id="toc" class="toc">'
1723                         . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1724                         . $toc
1725                         . "</ul>\n</div>\n";
1726         }
1727
1728         /**
1729          * Generate a table of contents from a section tree
1730          * Currently unused.
1731          *
1732          * @param array $tree Return value of ParserOutput::getSections()
1733          * @return string HTML fragment
1734          */
1735         public static function generateTOC( $tree ) {
1736                 $toc = '';
1737                 $lastLevel = 0;
1738                 foreach ( $tree as $section ) {
1739                         if ( $section['toclevel'] > $lastLevel ) {
1740                                 $toc .= self::tocIndent();
1741                         } elseif ( $section['toclevel'] < $lastLevel ) {
1742                                 $toc .= self::tocUnindent(
1743                                         $lastLevel - $section['toclevel'] );
1744                         } else {
1745                                 $toc .= self::tocLineEnd();
1746                         }
1747
1748                         $toc .= self::tocLine( $section['anchor'],
1749                                 $section['line'], $section['number'],
1750                                 $section['toclevel'], $section['index'] );
1751                         $lastLevel = $section['toclevel'];
1752                 }
1753                 $toc .= self::tocLineEnd();
1754                 return self::tocList( $toc );
1755         }
1756
1757         /**
1758          * Create a headline for content
1759          *
1760          * @param int $level The level of the headline (1-6)
1761          * @param string $attribs Any attributes for the headline, starting with
1762          *   a space and ending with '>'
1763          *   This *must* be at least '>' for no attribs
1764          * @param string $anchor The anchor to give the headline (the bit after the #)
1765          * @param string $html Html for the text of the header
1766          * @param string $link HTML to add for the section edit link
1767          * @param bool|string $legacyAnchor A second, optional anchor to give for
1768          *   backward compatibility (false to omit)
1769          *
1770          * @return string HTML headline
1771          */
1772         public static function makeHeadline( $level, $attribs, $anchor, $html,
1773                 $link, $legacyAnchor = false
1774         ) {
1775                 $ret = "<h$level$attribs"
1776                         . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1777                         . $link
1778                         . "</h$level>";
1779                 if ( $legacyAnchor !== false ) {
1780                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1781                 }
1782                 return $ret;
1783         }
1784
1785         /**
1786          * Split a link trail, return the "inside" portion and the remainder of the trail
1787          * as a two-element array
1788          * @param string $trail
1789          * @return array
1790          */
1791         static function splitTrail( $trail ) {
1792                 global $wgContLang;
1793                 $regex = $wgContLang->linkTrail();
1794                 $inside = '';
1795                 if ( $trail !== '' ) {
1796                         $m = array();
1797                         if ( preg_match( $regex, $trail, $m ) ) {
1798                                 $inside = $m[1];
1799                                 $trail = $m[2];
1800                         }
1801                 }
1802                 return array( $inside, $trail );
1803         }
1804
1805         /**
1806          * Generate a rollback link for a given revision.  Currently it's the
1807          * caller's responsibility to ensure that the revision is the top one. If
1808          * it's not, of course, the user will get an error message.
1809          *
1810          * If the calling page is called with the parameter &bot=1, all rollback
1811          * links also get that parameter. It causes the edit itself and the rollback
1812          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1813          * changes, so this allows sysops to combat a busy vandal without bothering
1814          * other users.
1815          *
1816          * If the option verify is set this function will return the link only in case the
1817          * revision can be reverted. Please note that due to performance limitations
1818          * it might be assumed that a user isn't the only contributor of a page while
1819          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1820          * work if $wgShowRollbackEditCount is disabled, so this can only function
1821          * as an additional check.
1822          *
1823          * If the option noBrackets is set the rollback link wont be enclosed in []
1824          *
1825          * @param Revision $rev
1826          * @param IContextSource $context Context to use or null for the main context.
1827          * @param array $options
1828          * @return string
1829          */
1830         public static function generateRollback( $rev, IContextSource $context = null,
1831                 $options = array( 'verify' )
1832         ) {
1833                 if ( $context === null ) {
1834                         $context = RequestContext::getMain();
1835                 }
1836
1837                 $editCount = false;
1838                 if ( in_array( 'verify', $options ) ) {
1839                         $editCount = self::getRollbackEditCount( $rev, true );
1840                         if ( $editCount === false ) {
1841                                 return '';
1842                         }
1843                 }
1844
1845                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1846
1847                 if ( !in_array( 'noBrackets', $options ) ) {
1848                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->plain();
1849                 }
1850
1851                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1852         }
1853
1854         /**
1855          * This function will return the number of revisions which a rollback
1856          * would revert and, if $verify is set it will verify that a revision
1857          * can be reverted (that the user isn't the only contributor and the
1858          * revision we might rollback to isn't deleted). These checks can only
1859          * function as an additional check as this function only checks against
1860          * the last $wgShowRollbackEditCount edits.
1861          *
1862          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1863          * is set and the user is the only contributor of the page.
1864          *
1865          * @param Revision $rev
1866          * @param bool $verify Try to verify that this revision can really be rolled back
1867          * @return int|bool|null
1868          */
1869         public static function getRollbackEditCount( $rev, $verify ) {
1870                 global $wgShowRollbackEditCount;
1871                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1872                         // Nothing has happened, indicate this by returning 'null'
1873                         return null;
1874                 }
1875
1876                 $dbr = wfGetDB( DB_SLAVE );
1877
1878                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1879                 $res = $dbr->select(
1880                         'revision',
1881                         array( 'rev_user_text', 'rev_deleted' ),
1882                         // $rev->getPage() returns null sometimes
1883                         array( 'rev_page' => $rev->getTitle()->getArticleID() ),
1884                         __METHOD__,
1885                         array(
1886                                 'USE INDEX' => array( 'revision' => 'page_timestamp' ),
1887                                 'ORDER BY' => 'rev_timestamp DESC',
1888                                 'LIMIT' => $wgShowRollbackEditCount + 1
1889                         )
1890                 );
1891
1892                 $editCount = 0;
1893                 $moreRevs = false;
1894                 foreach ( $res as $row ) {
1895                         if ( $rev->getRawUserText() != $row->rev_user_text ) {
1896                                 if ( $verify &&
1897                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1898                                                 || $row->rev_deleted & Revision::DELETED_USER
1899                                 ) ) {
1900                                         // If the user or the text of the revision we might rollback
1901                                         // to is deleted in some way we can't rollback. Similar to
1902                                         // the sanity checks in WikiPage::commitRollback.
1903                                         return false;
1904                                 }
1905                                 $moreRevs = true;
1906                                 break;
1907                         }
1908                         $editCount++;
1909                 }
1910
1911                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1912                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1913                         // and there weren't any other revisions. That means that the current user is the only
1914                         // editor, so we can't rollback
1915                         return false;
1916                 }
1917                 return $editCount;
1918         }
1919
1920         /**
1921          * Build a raw rollback link, useful for collections of "tool" links
1922          *
1923          * @param Revision $rev
1924          * @param IContextSource|null $context Context to use or null for the main context.
1925          * @param int $editCount Number of edits that would be reverted
1926          * @return string HTML fragment
1927          */
1928         public static function buildRollbackLink( $rev, IContextSource $context = null,
1929                 $editCount = false
1930         ) {
1931                 global $wgShowRollbackEditCount, $wgMiserMode;
1932
1933                 // To config which pages are effected by miser mode
1934                 $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );
1935
1936                 if ( $context === null ) {
1937                         $context = RequestContext::getMain();
1938                 }
1939
1940                 $title = $rev->getTitle();
1941                 $query = array(
1942                         'action' => 'rollback',
1943                         'from' => $rev->getUserText(),
1944                         'token' => $context->getUser()->getEditToken( array(
1945                                 $title->getPrefixedText(),
1946                                 $rev->getUserText()
1947                         ) ),
1948                 );
1949                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1950                         $query['bot'] = '1';
1951                         $query['hidediff'] = '1'; // bug 15999
1952                 }
1953
1954                 $disableRollbackEditCount = false;
1955                 if ( $wgMiserMode ) {
1956                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1957                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1958                                         $disableRollbackEditCount = true;
1959                                         break;
1960                                 }
1961                         }
1962                 }
1963
1964                 if ( !$disableRollbackEditCount
1965                         && is_int( $wgShowRollbackEditCount )
1966                         && $wgShowRollbackEditCount > 0
1967                 ) {
1968                         if ( !is_numeric( $editCount ) ) {
1969                                 $editCount = self::getRollbackEditCount( $rev, false );
1970                         }
1971
1972                         if ( $editCount > $wgShowRollbackEditCount ) {
1973                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
1974                                         ->numParams( $wgShowRollbackEditCount )->parse();
1975                         } else {
1976                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1977                         }
1978
1979                         return self::link(
1980                                 $title,
1981                                 $editCount_output,
1982                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1983                                 $query,
1984                                 array( 'known', 'noclasses' )
1985                         );
1986                 } else {
1987                         return self::link(
1988                                 $title,
1989                                 $context->msg( 'rollbacklink' )->escaped(),
1990                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1991                                 $query,
1992                                 array( 'known', 'noclasses' )
1993                         );
1994                 }
1995         }
1996
1997         /**
1998          * Returns HTML for the "templates used on this page" list.
1999          *
2000          * Make an HTML list of templates, and then add a "More..." link at
2001          * the bottom. If $more is null, do not add a "More..." link. If $more
2002          * is a Title, make a link to that title and use it. If $more is a string,
2003          * directly paste it in as the link (escaping needs to be done manually).
2004          * Finally, if $more is a Message, call toString().
2005          *
2006          * @param array $templates Array of templates from Article::getUsedTemplate or similar
2007          * @param bool $preview Whether this is for a preview
2008          * @param bool $section Whether this is for a section edit
2009          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
2010          * @return string HTML output
2011          */
2012         public static function formatTemplates( $templates, $preview = false,
2013                 $section = false, $more = null
2014         ) {
2015                 global $wgLang;
2016                 wfProfileIn( __METHOD__ );
2017
2018                 $outText = '';
2019                 if ( count( $templates ) > 0 ) {
2020                         # Do a batch existence check
2021                         $batch = new LinkBatch;
2022                         foreach ( $templates as $title ) {
2023                                 $batch->addObj( $title );
2024                         }
2025                         $batch->execute();
2026
2027                         # Construct the HTML
2028                         $outText = '<div class="mw-templatesUsedExplanation">';
2029                         if ( $preview ) {
2030                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
2031                                         ->parseAsBlock();
2032                         } elseif ( $section ) {
2033                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
2034                                         ->parseAsBlock();
2035                         } else {
2036                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
2037                                         ->parseAsBlock();
2038                         }
2039                         $outText .= "</div><ul>\n";
2040
2041                         usort( $templates, 'Title::compare' );
2042                         foreach ( $templates as $titleObj ) {
2043                                 $protected = '';
2044                                 $restrictions = $titleObj->getRestrictions( 'edit' );
2045                                 if ( $restrictions ) {
2046                                         // Check backwards-compatible messages
2047                                         $msg = null;
2048                                         if ( $restrictions === array( 'sysop' ) ) {
2049                                                 $msg = wfMessage( 'template-protected' );
2050                                         } elseif ( $restrictions === array( 'autoconfirmed' ) ) {
2051                                                 $msg = wfMessage( 'template-semiprotected' );
2052                                         }
2053                                         if ( $msg && !$msg->isDisabled() ) {
2054                                                 $protected = $msg->parse();
2055                                         } else {
2056                                                 // Construct the message from restriction-level-*
2057                                                 // e.g. restriction-level-sysop, restriction-level-autoconfirmed
2058                                                 $msgs = array();
2059                                                 foreach ( $restrictions as $r ) {
2060                                                         $msgs[] = wfMessage( "restriction-level-$r" )->parse();
2061                                                 }
2062                                                 $protected = wfMessage( 'parentheses' )
2063                                                         ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
2064                                         }
2065                                 }
2066                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
2067                                         $editLink = self::link(
2068                                                 $titleObj,
2069                                                 wfMessage( 'editlink' )->text(),
2070                                                 array(),
2071                                                 array( 'action' => 'edit' )
2072                                         );
2073                                 } else {
2074                                         $editLink = self::link(
2075                                                 $titleObj,
2076                                                 wfMessage( 'viewsourcelink' )->text(),
2077                                                 array(),
2078                                                 array( 'action' => 'edit' )
2079                                         );
2080                                 }
2081                                 $outText .= '<li>' . self::link( $titleObj )
2082                                         . wfMessage( 'word-separator' )->escaped()
2083                                         . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
2084                                         . wfMessage( 'word-separator' )->escaped()
2085                                         . $protected . '</li>';
2086                         }
2087
2088                         if ( $more instanceof Title ) {
2089                                 $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
2090                         } elseif ( $more ) {
2091                                 $outText .= "<li>$more</li>";
2092                         }
2093
2094                         $outText .= '</ul>';
2095                 }
2096                 wfProfileOut( __METHOD__ );
2097                 return $outText;
2098         }
2099
2100         /**
2101          * Returns HTML for the "hidden categories on this page" list.
2102          *
2103          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
2104          *   or similar
2105          * @return string HTML output
2106          */
2107         public static function formatHiddenCategories( $hiddencats ) {
2108                 wfProfileIn( __METHOD__ );
2109
2110                 $outText = '';
2111                 if ( count( $hiddencats ) > 0 ) {
2112                         # Construct the HTML
2113                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
2114                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
2115                         $outText .= "</div><ul>\n";
2116
2117                         foreach ( $hiddencats as $titleObj ) {
2118                                 # If it's hidden, it must exist - no need to check with a LinkBatch
2119                                 $outText .= '<li>'
2120                                         . self::link( $titleObj, null, array(), array(), 'known' )
2121                                         . "</li>\n";
2122                         }
2123                         $outText .= '</ul>';
2124                 }
2125                 wfProfileOut( __METHOD__ );
2126                 return $outText;
2127         }
2128
2129         /**
2130          * Format a size in bytes for output, using an appropriate
2131          * unit (B, KB, MB or GB) according to the magnitude in question
2132          *
2133          * @param int $size Size to format
2134          * @return string
2135          */
2136         public static function formatSize( $size ) {
2137                 global $wgLang;
2138                 return htmlspecialchars( $wgLang->formatSize( $size ) );
2139         }
2140
2141         /**
2142          * Given the id of an interface element, constructs the appropriate title
2143          * attribute from the system messages.  (Note, this is usually the id but
2144          * isn't always, because sometimes the accesskey needs to go on a different
2145          * element than the id, for reverse-compatibility, etc.)
2146          *
2147          * @param string $name Id of the element, minus prefixes.
2148          * @param string|null $options Null or the string 'withaccess' to add an access-
2149          *   key hint
2150          * @return string Contents of the title attribute (which you must HTML-
2151          *   escape), or false for no title attribute
2152          */
2153         public static function titleAttrib( $name, $options = null ) {
2154                 wfProfileIn( __METHOD__ );
2155
2156                 $message = wfMessage( "tooltip-$name" );
2157
2158                 if ( !$message->exists() ) {
2159                         $tooltip = false;
2160                 } else {
2161                         $tooltip = $message->text();
2162                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2163                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2164                         # Message equal to '-' means suppress it.
2165                         if ( $tooltip == '-' ) {
2166                                 $tooltip = false;
2167                         }
2168                 }
2169
2170                 if ( $options == 'withaccess' ) {
2171                         $accesskey = self::accesskey( $name );
2172                         if ( $accesskey !== false ) {
2173                                 // Should be build the same as in jquery.accessKeyLabel.js
2174                                 if ( $tooltip === false || $tooltip === '' ) {
2175                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2176                                 } else {
2177                                         $tooltip .= wfMessage( 'word-separator' )->text();
2178                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2179                                 }
2180                         }
2181                 }
2182
2183                 wfProfileOut( __METHOD__ );
2184                 return $tooltip;
2185         }
2186
2187         private static $accesskeycache;
2188
2189         /**
2190          * Given the id of an interface element, constructs the appropriate
2191          * accesskey attribute from the system messages.  (Note, this is usually
2192          * the id but isn't always, because sometimes the accesskey needs to go on
2193          * a different element than the id, for reverse-compatibility, etc.)
2194          *
2195          * @param string $name Id of the element, minus prefixes.
2196          * @return string Contents of the accesskey attribute (which you must HTML-
2197          *   escape), or false for no accesskey attribute
2198          */
2199         public static function accesskey( $name ) {
2200                 if ( isset( self::$accesskeycache[$name] ) ) {
2201                         return self::$accesskeycache[$name];
2202                 }
2203                 wfProfileIn( __METHOD__ );
2204
2205                 $message = wfMessage( "accesskey-$name" );
2206
2207                 if ( !$message->exists() ) {
2208                         $accesskey = false;
2209                 } else {
2210                         $accesskey = $message->plain();
2211                         if ( $accesskey === '' || $accesskey === '-' ) {
2212                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2213                                 # attribute, but this is broken for accesskey: that might be a useful
2214                                 # value.
2215                                 $accesskey = false;
2216                         }
2217                 }
2218
2219                 wfProfileOut( __METHOD__ );
2220                 self::$accesskeycache[$name] = $accesskey;
2221                 return self::$accesskeycache[$name];
2222         }
2223
2224         /**
2225          * Get a revision-deletion link, or disabled link, or nothing, depending
2226          * on user permissions & the settings on the revision.
2227          *
2228          * Will use forward-compatible revision ID in the Special:RevDelete link
2229          * if possible, otherwise the timestamp-based ID which may break after
2230          * undeletion.
2231          *
2232          * @param User $user
2233          * @param Revision $rev
2234          * @param Revision $title
2235          * @return string HTML fragment
2236          */
2237         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2238                 $canHide = $user->isAllowed( 'deleterevision' );
2239                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2240                         return '';
2241                 }
2242
2243                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2244                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2245                 } else {
2246                         if ( $rev->getId() ) {
2247                                 // RevDelete links using revision ID are stable across
2248                                 // page deletion and undeletion; use when possible.
2249                                 $query = array(
2250                                         'type' => 'revision',
2251                                         'target' => $title->getPrefixedDBkey(),
2252                                         'ids' => $rev->getId()
2253                                 );
2254                         } else {
2255                                 // Older deleted entries didn't save a revision ID.
2256                                 // We have to refer to these by timestamp, ick!
2257                                 $query = array(
2258                                         'type' => 'archive',
2259                                         'target' => $title->getPrefixedDBkey(),
2260                                         'ids' => $rev->getTimestamp()
2261                                 );
2262                         }
2263                         return Linker::revDeleteLink( $query,
2264                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2265                 }
2266         }
2267
2268         /**
2269          * Creates a (show/hide) link for deleting revisions/log entries
2270          *
2271          * @param array $query Query parameters to be passed to link()
2272          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2273          * @param bool $delete Set to true to use (show/hide) rather than (show)
2274          *
2275          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2276          * span to allow for customization of appearance with CSS
2277          */
2278         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
2279                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2280                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2281                 $html = wfMessage( $msgKey )->escaped();
2282                 $tag = $restricted ? 'strong' : 'span';
2283                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
2284                 return Xml::tags(
2285                         $tag,
2286                         array( 'class' => 'mw-revdelundel-link' ),
2287                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2288                 );
2289         }
2290
2291         /**
2292          * Creates a dead (show/hide) link for deleting revisions/log entries
2293          *
2294          * @param bool $delete Set to true to use (show/hide) rather than (show)
2295          *
2296          * @return string HTML text wrapped in a span to allow for customization
2297          * of appearance with CSS
2298          */
2299         public static function revDeleteLinkDisabled( $delete = true ) {
2300                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2301                 $html = wfMessage( $msgKey )->escaped();
2302                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2303                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
2304         }
2305
2306         /* Deprecated methods */
2307
2308         /**
2309          * @deprecated since 1.16 Use link(); warnings since 1.21
2310          *
2311          * Make a link for a title which may or may not be in the database. If you need to
2312          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
2313          * call to this will result in a DB query.
2314          *
2315          * @param Title $nt The title object to make the link from, e.g. from Title::newFromText.
2316          * @param string $text Link text
2317          * @param string $query Optional query part
2318          * @param string $trail Optional trail. Alphabetic characters at the start of this string will
2319          *   be included in the link text. Other characters will be appended after
2320          *   the end of the link.
2321          * @param string $prefix Optional prefix. As trail, only before instead of after.
2322          * @return string
2323          */
2324         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2325                 wfDeprecated( __METHOD__, '1.21' );
2326
2327                 wfProfileIn( __METHOD__ );
2328                 $query = wfCgiToArray( $query );
2329                 list( $inside, $trail ) = self::splitTrail( $trail );
2330                 if ( $text === '' ) {
2331                         $text = self::linkText( $nt );
2332                 }
2333
2334                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
2335
2336                 wfProfileOut( __METHOD__ );
2337                 return $ret;
2338         }
2339
2340         /**
2341          * @deprecated since 1.16 Use link(); warnings since 1.21
2342          *
2343          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
2344          * it doesn't have to do a database query. It's also valid for interwiki titles and special
2345          * pages.
2346          *
2347          * @param Title $title Title object of target page
2348          * @param string $text Text to replace the title
2349          * @param string $query Link target
2350          * @param string $trail Text after link
2351          * @param string $prefix Text before link text
2352          * @param string $aprops Extra attributes to the a-element
2353          * @param string $style Style to apply - if empty, use getInternalLinkAttributesObj instead
2354          * @return string The a-element
2355          */
2356         static function makeKnownLinkObj(
2357                 $title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
2358         ) {
2359                 wfDeprecated( __METHOD__, '1.21' );
2360
2361                 wfProfileIn( __METHOD__ );
2362
2363                 if ( $text == '' ) {
2364                         $text = self::linkText( $title );
2365                 }
2366                 $attribs = Sanitizer::mergeAttributes(
2367                         Sanitizer::decodeTagAttributes( $aprops ),
2368                         Sanitizer::decodeTagAttributes( $style )
2369                 );
2370                 $query = wfCgiToArray( $query );
2371                 list( $inside, $trail ) = self::splitTrail( $trail );
2372
2373                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
2374                         array( 'known', 'noclasses' ) ) . $trail;
2375
2376                 wfProfileOut( __METHOD__ );
2377                 return $ret;
2378         }
2379
2380         /**
2381          * Returns the attributes for the tooltip and access key.
2382          * @param string $name
2383          * @return array
2384          */
2385         public static function tooltipAndAccesskeyAttribs( $name ) {
2386                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2387                 # no attribute" instead of "output '' as value for attribute", this
2388                 # would be three lines.
2389                 $attribs = array(
2390                         'title' => self::titleAttrib( $name, 'withaccess' ),
2391                         'accesskey' => self::accesskey( $name )
2392                 );
2393                 if ( $attribs['title'] === false ) {
2394                         unset( $attribs['title'] );
2395                 }
2396                 if ( $attribs['accesskey'] === false ) {
2397                         unset( $attribs['accesskey'] );
2398                 }
2399                 return $attribs;
2400         }
2401
2402         /**
2403          * Returns raw bits of HTML, use titleAttrib()
2404          * @param string $name
2405          * @param array|null $options
2406          * @return null|string
2407          */
2408         public static function tooltip( $name, $options = null ) {
2409                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2410                 # no attribute" instead of "output '' as value for attribute", this
2411                 # would be two lines.
2412                 $tooltip = self::titleAttrib( $name, $options );
2413                 if ( $tooltip === false ) {
2414                         return '';
2415                 }
2416                 return Xml::expandAttributes( array(
2417                         'title' => $tooltip
2418                 ) );
2419         }
2420 }
2421
2422 /**
2423  * @since 1.18
2424  */
2425 class DummyLinker {
2426
2427         /**
2428          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2429          * into static calls to the new Linker for backwards compatibility.
2430          *
2431          * @param string $fname Name of called method
2432          * @param array $args Arguments to the method
2433          * @return mixed
2434          */
2435         public function __call( $fname, $args ) {
2436                 return call_user_func_array( array( 'Linker', $fname ), $args );
2437         }
2438 }