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 interwiki link.
  41          *
  42          * @deprecated since 1.25
  43          *
  44          * @param string $title The title text for the link, URL-encoded (???) but
  45          *   not HTML-escaped
  46          * @param string $unused Unused
  47          * @param string $class The contents of the class attribute; if an empty
  48          *   string is passed, which is the default value, defaults to 'external'.
  49          * @return string
  50          */
  51         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  52                 global $wgContLang;
  53
  54                 wfDeprecated( __METHOD__, '1.25' );
  55
  56                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  57                 # getExternalLinkAttributes, why?
  58                 $title = urldecode( $title );
  59                 $title = $wgContLang->checkTitleEncoding( $title );
  60                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  61
  62                 return self::getLinkAttributesInternal( $title, $class );
  63         }
  64
  65         /**
  66          * Get the appropriate HTML attributes to add to the "a" element of an internal link.
  67          *
  68          * @deprecated since 1.25
  69          *
  70          * @param string $title The title text for the link, URL-encoded (???) but
  71          *   not HTML-escaped
  72          * @param string $unused Unused
  73          * @param string $class The contents of the class attribute, default none
  74          * @return string
  75          */
  76         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  77                 wfDeprecated( __METHOD__, '1.25' );
  78
  79                 $title = urldecode( $title );
  80                 $title = strtr( $title, '_', ' ' );
  81                 return self::getLinkAttributesInternal( $title, $class );
  82         }
  83
  84         /**
  85          * Get the appropriate HTML attributes to add to the "a" element of an internal
  86          * link, given the Title object for the page we want to link to.
  87          *
  88          * @deprecated since 1.25
  89          *
  90          * @param Title $nt
  91          * @param string $unused Unused
  92          * @param string $class The contents of the class attribute, default none
  93          * @param string|bool $title Optional (unescaped) string to use in the title
  94          *   attribute; if false, default to the name of the page we're linking to
  95          * @return string
  96          */
  97         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
  98                 wfDeprecated( __METHOD__, '1.25' );
  99
 100                 if ( $title === false ) {
 101                         $title = $nt->getPrefixedText();
 102                 }
 103                 return self::getLinkAttributesInternal( $title, $class );
 104         }
 105
 106         /**
 107          * Common code for getLinkAttributesX functions
 108          *
 109          * @deprecated since 1.25
 110          *
 111          * @param string $title
 112          * @param string $class
 113          *
 114          * @return string
 115          */
 116         private static function getLinkAttributesInternal( $title, $class ) {
 117                 wfDeprecated( __METHOD__, '1.25' );
 118
 119                 $title = htmlspecialchars( $title );
 120                 $class = htmlspecialchars( $class );
 121                 $r = '';
 122                 if ( $class != '' ) {
 123                         $r .= " class=\"$class\"";
 124                 }
 125                 if ( $title != '' ) {
 126                         $r .= " title=\"$title\"";
 127                 }
 128                 return $r;
 129         }
 130
 131         /**
 132          * Return the CSS colour of a known link
 133          *
 134          * @param Title $t
 135          * @param int $threshold User defined threshold
 136          * @return string CSS class
 137          */
 138         public static function getLinkColour( $t, $threshold ) {
 139                 $colour = '';
 140                 if ( $t->isRedirect() ) {
 141                         # Page is a redirect
 142                         $colour = 'mw-redirect';
 143                 } elseif ( $threshold > 0 && $t->isContentPage() &&
 144                         $t->exists() && $t->getLength() < $threshold
 145                 ) {
 146                         # Page is a stub
 147                         $colour = 'stub';
 148                 }
 149                 return $colour;
 150         }
 151
 152         /**
 153          * This function returns an HTML link to the given target.  It serves a few
 154          * purposes:
 155          *   1) If $target is a Title, the correct URL to link to will be figured
 156          *      out automatically.
 157          *   2) It automatically adds the usual classes for various types of link
 158          *      targets: "new" for red links, "stub" for short articles, etc.
 159          *   3) It escapes all attribute values safely so there's no risk of XSS.
 160          *   4) It provides a default tooltip if the target is a Title (the page
 161          *      name of the target).
 162          * link() replaces the old functions in the makeLink() family.
 163          *
 164          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 165          *
 166          * @param Title $target Can currently only be a Title, but this may
 167          *   change to support Images, literal URLs, etc.
 168          * @param string $html The HTML contents of the <a> element, i.e.,
 169          *   the link text.  This is raw HTML and will not be escaped.  If null,
 170          *   defaults to the prefixed text of the Title; or if the Title is just a
 171          *   fragment, the contents of the fragment.
 172          * @param array $customAttribs A key => value array of extra HTML attributes,
 173          *   such as title and class.  (href is ignored.)  Classes will be
 174          *   merged with the default classes, while other attributes will replace
 175          *   default attributes.  All passed attribute values will be HTML-escaped.
 176          *   A false attribute value means to suppress that attribute.
 177          * @param array $query The query string to append to the URL
 178          *   you're linking to, in key => value array form.  Query keys and values
 179          *   will be URL-encoded.
 180          * @param string|array $options String or array of strings:
 181          *     'known': Page is known to exist, so don't check if it does.
 182          *     'broken': Page is known not to exist, so don't check if it does.
 183          *     'noclasses': Don't add any classes automatically (includes "new",
 184          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
 185          *       provided, if any, so you get a simple blue link with no funny i-
 186          *       cons.
 187          *     'forcearticlepath': Use the article path always, even with a querystring.
 188          *       Has compatibility issues on some setups, so avoid wherever possible.
 189          *     'http': Force a full URL with http:// as the scheme.
 190          *     'https': Force a full URL with https:// as the scheme.
 191          * @return string HTML <a> attribute
 192          */
 193         public static function link(
 194                 $target, $html = null, $customAttribs = array(), $query = array(), $options = array()
 195         ) {
 196                 if ( !$target instanceof Title ) {
 197                         wfWarn( __METHOD__ . ': Requires $target to be a Title object.', 2 );
 198                         return "<!-- ERROR -->$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 ( !Hooks::run( 'LinkBegin',
 212                         array( $dummy, $target, &$html, &$customAttribs, &$query, &$options, &$ret ) )
 213                 ) {
 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                 if ( !in_array( 'known', $options ) && !in_array( 'broken', $options ) ) {
 222                         if ( $target->isKnown() ) {
 223                                 $options[] = 'known';
 224                         } else {
 225                                 $options[] = 'broken';
 226                         }
 227                 }
 228
 229                 $oldquery = array();
 230                 if ( in_array( "forcearticlepath", $options ) && $query ) {
 231                         $oldquery = $query;
 232                         $query = array();
 233                 }
 234
 235                 # Note: we want the href attribute first, for prettiness.
 236                 $attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
 237                 if ( in_array( 'forcearticlepath', $options ) && $oldquery ) {
 238                         $attribs['href'] = wfAppendQuery( $attribs['href'], $oldquery );
 239                 }
 240
 241                 $attribs = array_merge(
 242                         $attribs,
 243                         self::linkAttribs( $target, $customAttribs, $options )
 244                 );
 245                 if ( is_null( $html ) ) {
 246                         $html = self::linkText( $target );
 247                 }
 248
 249                 $ret = null;
 250                 if ( Hooks::run( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
 251                         $ret = Html::rawElement( 'a', $attribs, $html );
 252                 }
 253
 254                 return $ret;
 255         }
 256
 257         /**
 258          * Identical to link(), except $options defaults to 'known'.
 259          * @see Linker::link
 260          * @return string
 261          */
 262         public static function linkKnown(
 263                 $target, $html = null, $customAttribs = array(),
 264                 $query = array(), $options = array( 'known', 'noclasses' )
 265         ) {
 266                 return self::link( $target, $html, $customAttribs, $query, $options );
 267         }
 268
 269         /**
 270          * Returns the Url used to link to a Title
 271          *
 272          * @param Title $target
 273          * @param array $query Query parameters
 274          * @param array $options
 275          * @return string
 276          */
 277         private static function linkUrl( $target, $query, $options ) {
 278                 # We don't want to include fragments for broken links, because they
 279                 # generally make no sense.
 280                 if ( in_array( 'broken', $options ) && $target->hasFragment() ) {
 281                         $target = clone $target;
 282                         $target->setFragment( '' );
 283                 }
 284
 285                 # If it's a broken link, add the appropriate query pieces, unless
 286                 # there's already an action specified, or unless 'edit' makes no sense
 287                 # (i.e., for a nonexistent special page).
 288                 if ( in_array( 'broken', $options ) && empty( $query['action'] )
 289                         && !$target->isSpecialPage() ) {
 290                         $query['action'] = 'edit';
 291                         $query['redlink'] = '1';
 292                 }
 293
 294                 if ( in_array( 'http', $options ) ) {
 295                         $proto = PROTO_HTTP;
 296                 } elseif ( in_array( 'https', $options ) ) {
 297                         $proto = PROTO_HTTPS;
 298                 } else {
 299                         $proto = PROTO_RELATIVE;
 300                 }
 301
 302                 $ret = $target->getLinkURL( $query, false, $proto );
 303                 return $ret;
 304         }
 305
 306         /**
 307          * Returns the array of attributes used when linking to the Title $target
 308          *
 309          * @param Title $target
 310          * @param array $attribs
 311          * @param array $options
 312          *
 313          * @return array
 314          */
 315         private static function linkAttribs( $target, $attribs, $options ) {
 316                 global $wgUser;
 317                 $defaults = array();
 318
 319                 if ( !in_array( 'noclasses', $options ) ) {
 320                         # Now build the classes.
 321                         $classes = array();
 322
 323                         if ( in_array( 'broken', $options ) ) {
 324                                 $classes[] = 'new';
 325                         }
 326
 327                         if ( $target->isExternal() ) {
 328                                 $classes[] = 'extiw';
 329                         }
 330
 331                         if ( !in_array( 'broken', $options ) ) { # Avoid useless calls to LinkCache (see r50387)
 332                                 $colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
 333                                 if ( $colour !== '' ) {
 334                                         $classes[] = $colour; # mw-redirect or stub
 335                                 }
 336                         }
 337                         if ( $classes != array() ) {
 338                                 $defaults['class'] = implode( ' ', $classes );
 339                         }
 340                 }
 341
 342                 # Get a default title attribute.
 343                 if ( $target->getPrefixedText() == '' ) {
 344                         # A link like [[#Foo]].  This used to mean an empty title
 345                         # attribute, but that's silly.  Just don't output a title.
 346                 } elseif ( in_array( 'known', $options ) ) {
 347                         $defaults['title'] = $target->getPrefixedText();
 348                 } else {
 349                         $defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )->text();
 350                 }
 351
 352                 # Finally, merge the custom attribs with the default ones, and iterate
 353                 # over that, deleting all "false" attributes.
 354                 $ret = array();
 355                 $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
 356                 foreach ( $merged as $key => $val ) {
 357                         # A false value suppresses the attribute, and we don't want the
 358                         # href attribute to be overridden.
 359                         if ( $key != 'href' && $val !== false ) {
 360                                 $ret[$key] = $val;
 361                         }
 362                 }
 363                 return $ret;
 364         }
 365
 366         /**
 367          * Default text of the links to the Title $target
 368          *
 369          * @param Title $target
 370          *
 371          * @return string
 372          */
 373         private static function linkText( $target ) {
 374                 if ( !$target instanceof Title ) {
 375                         wfWarn( __METHOD__ . ': Requires $target to be a Title object.' );
 376                         return '';
 377                 }
 378                 // If the target is just a fragment, with no title, we return the fragment
 379                 // text.  Otherwise, we return the title text itself.
 380                 if ( $target->getPrefixedText() === '' && $target->hasFragment() ) {
 381                         return htmlspecialchars( $target->getFragment() );
 382                 }
 383
 384                 return htmlspecialchars( $target->getPrefixedText() );
 385         }
 386
 387         /**
 388          * Make appropriate markup for a link to the current article. This is
 389          * currently rendered as the bold link text. The calling sequence is the
 390          * same as the other make*LinkObj static functions, despite $query not
 391          * being used.
 392          *
 393          * @param Title $nt
 394          * @param string $html [optional]
 395          * @param string $query [optional]
 396          * @param string $trail [optional]
 397          * @param string $prefix [optional]
 398          *
 399          * @return string
 400          */
 401         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 402                 $ret = "<strong class=\"selflink\">{$prefix}{$html}</strong>{$trail}";
 403                 if ( !Hooks::run( 'SelfLinkBegin', array( $nt, &$html, &$trail, &$prefix, &$ret ) ) ) {
 404                         return $ret;
 405                 }
 406
 407                 if ( $html == '' ) {
 408                         $html = htmlspecialchars( $nt->getPrefixedText() );
 409                 }
 410                 list( $inside, $trail ) = self::splitTrail( $trail );
 411                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 412         }
 413
 414         /**
 415          * Get a message saying that an invalid title was encountered.
 416          * This should be called after a method like Title::makeTitleSafe() returned
 417          * a value indicating that the title object is invalid.
 418          *
 419          * @param IContextSource $context Context to use to get the messages
 420          * @param int $namespace Namespace number
 421          * @param string $title Text of the title, without the namespace part
 422          * @return string
 423          */
 424         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 425                 global $wgContLang;
 426
 427                 // First we check whether the namespace exists or not.
 428                 if ( MWNamespace::exists( $namespace ) ) {
 429                         if ( $namespace == NS_MAIN ) {
 430                                 $name = $context->msg( 'blanknamespace' )->text();
 431                         } else {
 432                                 $name = $wgContLang->getFormattedNsText( $namespace );
 433                         }
 434                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 435                 } else {
 436                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 437                 }
 438         }
 439
 440         /**
 441          * @param Title $title
 442          * @return Title
 443          */
 444         static function normaliseSpecialPage( Title $title ) {
 445                 if ( $title->isSpecialPage() ) {
 446                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 447                         if ( !$name ) {
 448                                 return $title;
 449                         }
 450                         $ret = SpecialPage::getTitleFor( $name, $subpage, $title->getFragment() );
 451                         return $ret;
 452                 } else {
 453                         return $title;
 454                 }
 455         }
 456
 457         /**
 458          * Returns the filename part of an url.
 459          * Used as alternative text for external images.
 460          *
 461          * @param string $url
 462          *
 463          * @return string
 464          */
 465         private static function fnamePart( $url ) {
 466                 $basename = strrchr( $url, '/' );
 467                 if ( false === $basename ) {
 468                         $basename = $url;
 469                 } else {
 470                         $basename = substr( $basename, 1 );
 471                 }
 472                 return $basename;
 473         }
 474
 475         /**
 476          * Return the code for images which were added via external links,
 477          * via Parser::maybeMakeExternalImage().
 478          *
 479          * @param string $url
 480          * @param string $alt
 481          *
 482          * @return string
 483          */
 484         public static function makeExternalImage( $url, $alt = '' ) {
 485                 if ( $alt == '' ) {
 486                         $alt = self::fnamePart( $url );
 487                 }
 488                 $img = '';
 489                 $success = Hooks::run( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
 490                 if ( !$success ) {
 491                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 492                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 493                         return $img;
 494                 }
 495                 return Html::element( 'img',
 496                         array(
 497                                 'src' => $url,
 498                                 'alt' => $alt ) );
 499         }
 500
 501         /**
 502          * Given parameters derived from [[Image:Foo|options...]], generate the
 503          * HTML that that syntax inserts in the page.
 504          *
 505          * @param Parser $parser
 506          * @param Title $title Title object of the file (not the currently viewed page)
 507          * @param File $file File object, or false if it doesn't exist
 508          * @param array $frameParams Associative array of parameters external to the media handler.
 509          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 510          *     will often be false.
 511          *          thumbnail       If present, downscale and frame
 512          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 513          *          framed          Shows image in original size in a frame
 514          *          frameless       Downscale but don't frame
 515          *          upright         If present, tweak default sizes for portrait orientation
 516          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 517          *          border          If present, show a border around the image
 518          *          align           Horizontal alignment (left, right, center, none)
 519          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 520          *                          bottom, text-bottom)
 521          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 522          *          class           HTML for image classes. Plain text.
 523          *          caption         HTML for image caption.
 524          *          link-url        URL to link to
 525          *          link-title      Title object to link to
 526          *          link-target     Value for the target attribute, only with link-url
 527          *          no-link         Boolean, suppress description link
 528          *
 529          * @param array $handlerParams Associative array of media handler parameters, to be passed
 530          *       to transform(). Typical keys are "width" and "page".
 531          * @param string|bool $time Timestamp of the file, set as false for current
 532          * @param string $query Query params for desc url
 533          * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
 534          * @since 1.20
 535          * @return string HTML for an image, with links, wrappers, etc.
 536          */
 537         public static function makeImageLink( Parser $parser, Title $title,
 538                 $file, $frameParams = array(), $handlerParams = array(), $time = false,
 539                 $query = "", $widthOption = null
 540         ) {
 541                 $res = null;
 542                 $dummy = new DummyLinker;
 543                 if ( !Hooks::run( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
 544                         &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
 545                         return $res;
 546                 }
 547
 548                 if ( $file && !$file->allowInlineDisplay() ) {
 549                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 550                         return self::link( $title );
 551                 }
 552
 553                 // Shortcuts
 554                 $fp =& $frameParams;
 555                 $hp =& $handlerParams;
 556
 557                 // Clean up parameters
 558                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 559                 if ( !isset( $fp['align'] ) ) {
 560                         $fp['align'] = '';
 561                 }
 562                 if ( !isset( $fp['alt'] ) ) {
 563                         $fp['alt'] = '';
 564                 }
 565                 if ( !isset( $fp['title'] ) ) {
 566                         $fp['title'] = '';
 567                 }
 568                 if ( !isset( $fp['class'] ) ) {
 569                         $fp['class'] = '';
 570                 }
 571
 572                 $prefix = $postfix = '';
 573
 574                 if ( 'center' == $fp['align'] ) {
 575                         $prefix = '<div class="center">';
 576                         $postfix = '</div>';
 577                         $fp['align'] = 'none';
 578                 }
 579                 if ( $file && !isset( $hp['width'] ) ) {
 580                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 581                                 // If its a vector image, and user only specifies height
 582                                 // we don't want it to be limited by its "normal" width.
 583                                 global $wgSVGMaxSize;
 584                                 $hp['width'] = $wgSVGMaxSize;
 585                         } else {
 586                                 $hp['width'] = $file->getWidth( $page );
 587                         }
 588
 589                         if ( isset( $fp['thumbnail'] )
 590                                 || isset( $fp['manualthumb'] )
 591                                 || isset( $fp['framed'] )
 592                                 || isset( $fp['frameless'] )
 593                                 || !$hp['width']
 594                         ) {
 595                                 global $wgThumbLimits, $wgThumbUpright;
 596
 597                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 598                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 599                                 }
 600
 601                                 // Reduce width for upright images when parameter 'upright' is used
 602                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 603                                         $fp['upright'] = $wgThumbUpright;
 604                                 }
 605
 606                                 // For caching health: If width scaled down due to upright
 607                                 // parameter, round to full __0 pixel to avoid the creation of a
 608                                 // lot of odd thumbs.
 609                                 $prefWidth = isset( $fp['upright'] ) ?
 610                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 611                                         $wgThumbLimits[$widthOption];
 612
 613                                 // Use width which is smaller: real image width or user preference width
 614                                 // Unless image is scalable vector.
 615                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 616                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 617                                         $hp['width'] = $prefWidth;
 618                                 }
 619                         }
 620                 }
 621
 622                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 623                         # Create a thumbnail. Alignment depends on the writing direction of
 624                         # the page content language (right-aligned for LTR languages,
 625                         # left-aligned for RTL languages)
 626                         #
 627                         # If a thumbnail width has not been provided, it is set
 628                         # to the default user option as specified in Language*.php
 629                         if ( $fp['align'] == '' ) {
 630                                 $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 631                         }
 632                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 633                 }
 634
 635                 if ( $file && isset( $fp['frameless'] ) ) {
 636                         $srcWidth = $file->getWidth( $page );
 637                         # For "frameless" option: do not present an image bigger than the
 638                         # source (for bitmap-style images). This is the same behavior as the
 639                         # "thumb" option does it already.
 640                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 641                                 $hp['width'] = $srcWidth;
 642                         }
 643                 }
 644
 645                 if ( $file && isset( $hp['width'] ) ) {
 646                         # Create a resized image, without the additional thumbnail features
 647                         $thumb = $file->transform( $hp );
 648                 } else {
 649                         $thumb = false;
 650                 }
 651
 652                 if ( !$thumb ) {
 653                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 654                 } else {
 655                         self::processResponsiveImages( $file, $thumb, $hp );
 656                         $params = array(
 657                                 'alt' => $fp['alt'],
 658                                 'title' => $fp['title'],
 659                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 660                                 'img-class' => $fp['class'] );
 661                         if ( isset( $fp['border'] ) ) {
 662                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 663                         }
 664                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 665
 666                         $s = $thumb->toHtml( $params );
 667                 }
 668                 if ( $fp['align'] != '' ) {
 669                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 670                 }
 671                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 672         }
 673
 674         /**
 675          * See makeImageLink()
 676          * When this function is removed, remove if( $parser instanceof Parser ) check there too
 677          * @deprecated since 1.20
 678          */
 679         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 680                 $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
 681                 return self::makeImageLink( null, $title, $file, $frameParams,
 682                         $handlerParams, $time, $query, $widthOption );
 683         }
 684
 685         /**
 686          * Get the link parameters for MediaTransformOutput::toHtml() from given
 687          * frame parameters supplied by the Parser.
 688          * @param array $frameParams The frame parameters
 689          * @param string $query An optional query string to add to description page links
 690          * @param Parser|null $parser
 691          * @return array
 692          */
 693         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 694                 $mtoParams = array();
 695                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 696                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 697                         if ( isset( $frameParams['link-target'] ) ) {
 698                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 699                         }
 700                         if ( $parser ) {
 701                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 702                                 foreach ( $extLinkAttrs as $name => $val ) {
 703                                         // Currently could include 'rel' and 'target'
 704                                         $mtoParams['parser-extlink-' . $name] = $val;
 705                                 }
 706                         }
 707                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 708                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 709                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 710                         // No link
 711                 } else {
 712                         $mtoParams['desc-link'] = true;
 713                         $mtoParams['desc-query'] = $query;
 714                 }
 715                 return $mtoParams;
 716         }
 717
 718         /**
 719          * Make HTML for a thumbnail including image, border and caption
 720          * @param Title $title
 721          * @param File|bool $file File object or false if it doesn't exist
 722          * @param string $label
 723          * @param string $alt
 724          * @param string $align
 725          * @param array $params
 726          * @param bool $framed
 727          * @param string $manualthumb
 728          * @return string
 729          */
 730         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 731                 $align = 'right', $params = array(), $framed = false, $manualthumb = ""
 732         ) {
 733                 $frameParams = array(
 734                         'alt' => $alt,
 735                         'caption' => $label,
 736                         'align' => $align
 737                 );
 738                 if ( $framed ) {
 739                         $frameParams['framed'] = true;
 740                 }
 741                 if ( $manualthumb ) {
 742                         $frameParams['manualthumb'] = $manualthumb;
 743                 }
 744                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 745         }
 746
 747         /**
 748          * @param Title $title
 749          * @param File $file
 750          * @param array $frameParams
 751          * @param array $handlerParams
 752          * @param bool $time
 753          * @param string $query
 754          * @return string
 755          */
 756         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 757                 $handlerParams = array(), $time = false, $query = ""
 758         ) {
 759                 $exists = $file && $file->exists();
 760
 761                 # Shortcuts
 762                 $fp =& $frameParams;
 763                 $hp =& $handlerParams;
 764
 765                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 766                 if ( !isset( $fp['align'] ) ) {
 767                         $fp['align'] = 'right';
 768                 }
 769                 if ( !isset( $fp['alt'] ) ) {
 770                         $fp['alt'] = '';
 771                 }
 772                 if ( !isset( $fp['title'] ) ) {
 773                         $fp['title'] = '';
 774                 }
 775                 if ( !isset( $fp['caption'] ) ) {
 776                         $fp['caption'] = '';
 777                 }
 778
 779                 if ( empty( $hp['width'] ) ) {
 780                         // Reduce width for upright images when parameter 'upright' is used
 781                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 782                 }
 783                 $thumb = false;
 784                 $noscale = false;
 785                 $manualthumb = false;
 786
 787                 if ( !$exists ) {
 788                         $outerWidth = $hp['width'] + 2;
 789                 } else {
 790                         if ( isset( $fp['manualthumb'] ) ) {
 791                                 # Use manually specified thumbnail
 792                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 793                                 if ( $manual_title ) {
 794                                         $manual_img = wfFindFile( $manual_title );
 795                                         if ( $manual_img ) {
 796                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 797                                                 $manualthumb = true;
 798                                         } else {
 799                                                 $exists = false;
 800                                         }
 801                                 }
 802                         } elseif ( isset( $fp['framed'] ) ) {
 803                                 // Use image dimensions, don't scale
 804                                 $thumb = $file->getUnscaledThumb( $hp );
 805                                 $noscale = true;
 806                         } else {
 807                                 # Do not present an image bigger than the source, for bitmap-style images
 808                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 809                                 $srcWidth = $file->getWidth( $page );
 810                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 811                                         $hp['width'] = $srcWidth;
 812                                 }
 813                                 $thumb = $file->transform( $hp );
 814                         }
 815
 816                         if ( $thumb ) {
 817                                 $outerWidth = $thumb->getWidth() + 2;
 818                         } else {
 819                                 $outerWidth = $hp['width'] + 2;
 820                         }
 821                 }
 822
 823                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 824                 # So we don't need to pass it here in $query. However, the URL for the
 825                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 826                 $url = $title->getLocalURL( $query );
 827                 if ( $page ) {
 828                         $url = wfAppendQuery( $url, array( 'page' => $page ) );
 829                 }
 830                 if ( $manualthumb
 831                         && !isset( $fp['link-title'] )
 832                         && !isset( $fp['link-url'] )
 833                         && !isset( $fp['no-link'] ) ) {
 834                         $fp['link-url'] = $url;
 835                 }
 836
 837                 $s = "<div class=\"thumb t{$fp['align']}\">"
 838                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 839
 840                 if ( !$exists ) {
 841                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 842                         $zoomIcon = '';
 843                 } elseif ( !$thumb ) {
 844                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 845                         $zoomIcon = '';
 846                 } else {
 847                         if ( !$noscale && !$manualthumb ) {
 848                                 self::processResponsiveImages( $file, $thumb, $hp );
 849                         }
 850                         $params = array(
 851                                 'alt' => $fp['alt'],
 852                                 'title' => $fp['title'],
 853                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
 854                                         ? $fp['class'] . ' '
 855                                         : '' ) . 'thumbimage'
 856                         );
 857                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 858                         $s .= $thumb->toHtml( $params );
 859                         if ( isset( $fp['framed'] ) ) {
 860                                 $zoomIcon = "";
 861                         } else {
 862                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 863                                         Html::rawElement( 'a', array(
 864                                                 'href' => $url,
 865                                                 'class' => 'internal',
 866                                                 'title' => wfMessage( 'thumbnail-more' )->text() ),
 867                                                 "" ) );
 868                         }
 869                 }
 870                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 871                 return str_replace( "\n", ' ', $s );
 872         }
 873
 874         /**
 875          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 876          * applicable.
 877          *
 878          * @param File $file
 879          * @param MediaTransformOutput $thumb
 880          * @param array $hp Image parameters
 881          */
 882         public static function processResponsiveImages( $file, $thumb, $hp ) {
 883                 global $wgResponsiveImages;
 884                 if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
 885                         $hp15 = $hp;
 886                         $hp15['width'] = round( $hp['width'] * 1.5 );
 887                         $hp20 = $hp;
 888                         $hp20['width'] = $hp['width'] * 2;
 889                         if ( isset( $hp['height'] ) ) {
 890                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 891                                 $hp20['height'] = $hp['height'] * 2;
 892                         }
 893
 894                         $thumb15 = $file->transform( $hp15 );
 895                         $thumb20 = $file->transform( $hp20 );
 896                         if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
 897                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 898                         }
 899                         if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
 900                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 901                         }
 902                 }
 903         }
 904
 905         /**
 906          * Make a "broken" link to an image
 907          *
 908          * @param Title $title
 909          * @param string $label Link label (plain text)
 910          * @param string $query Query string
 911          * @param string $unused1 Unused parameter kept for b/c
 912          * @param string $unused2 Unused parameter kept for b/c
 913          * @param bool $time A file of a certain timestamp was requested
 914          * @return string
 915          */
 916         public static function makeBrokenImageLinkObj( $title, $label = '',
 917                 $query = '', $unused1 = '', $unused2 = '', $time = false
 918         ) {
 919                 if ( !$title instanceof Title ) {
 920                         wfWarn( __METHOD__ . ': Requires $title to be a Title object.' );
 921                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 922                 }
 923
 924                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 925                 if ( $label == '' ) {
 926                         $label = $title->getPrefixedText();
 927                 }
 928                 $encLabel = htmlspecialchars( $label );
 929                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 930
 931                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 932                         && !$currentExists
 933                 ) {
 934                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 935
 936                         if ( $redir ) {
 937                                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 938                         }
 939
 940                         $href = self::getUploadUrl( $title, $query );
 941
 942                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 943                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 944                                 $encLabel . '</a>';
 945                 }
 946
 947                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 948         }
 949
 950         /**
 951          * Get the URL to upload a certain file
 952          *
 953          * @param Title $destFile Title object of the file to upload
 954          * @param string $query Urlencoded query string to prepend
 955          * @return string Urlencoded URL
 956          */
 957         protected static function getUploadUrl( $destFile, $query = '' ) {
 958                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 959                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 960                 if ( $query != '' ) {
 961                         $q .= '&' . $query;
 962                 }
 963
 964                 if ( $wgUploadMissingFileUrl ) {
 965                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 966                 } elseif ( $wgUploadNavigationUrl ) {
 967                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 968                 } else {
 969                         $upload = SpecialPage::getTitleFor( 'Upload' );
 970                         return $upload->getLocalURL( $q );
 971                 }
 972         }
 973
 974         /**
 975          * Create a direct link to a given uploaded file.
 976          *
 977          * @param Title $title
 978          * @param string $html Pre-sanitized HTML
 979          * @param string $time MW timestamp of file creation time
 980          * @return string HTML
 981          */
 982         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 983                 $img = wfFindFile( $title, array( 'time' => $time ) );
 984                 return self::makeMediaLinkFile( $title, $img, $html );
 985         }
 986
 987         /**
 988          * Create a direct link to a given uploaded file.
 989          * This will make a broken link if $file is false.
 990          *
 991          * @param Title $title
 992          * @param File|bool $file File object or false
 993          * @param string $html Pre-sanitized HTML
 994          * @return string HTML
 995          *
 996          * @todo Handle invalid or missing images better.
 997          */
 998         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
 999                 if ( $file && $file->exists() ) {
1000                         $url = $file->getURL();
1001                         $class = 'internal';
1002                 } else {
1003                         $url = self::getUploadUrl( $title );
1004                         $class = 'new';
1005                 }
1006
1007                 $alt = $title->getText();
1008                 if ( $html == '' ) {
1009                         $html = $alt;
1010                 }
1011
1012                 $ret = '';
1013                 $attribs = array(
1014                         'href' => $url,
1015                         'class' => $class,
1016                         'title' => $alt
1017                 );
1018
1019                 if ( !Hooks::run( 'LinkerMakeMediaLinkFile',
1020                         array( $title, $file, &$html, &$attribs, &$ret ) ) ) {
1021                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
1022                                 . "with url {$url} and text {$html} to {$ret}\n", true );
1023                         return $ret;
1024                 }
1025
1026                 return Html::rawElement( 'a', $attribs, $html );
1027         }
1028
1029         /**
1030          * Make a link to a special page given its name and, optionally,
1031          * a message key from the link text.
1032          * Usage example: Linker::specialLink( 'Recentchanges' )
1033          *
1034          * @param string $name
1035          * @param string $key
1036          * @return string
1037          */
1038         public static function specialLink( $name, $key = '' ) {
1039                 if ( $key == '' ) {
1040                         $key = strtolower( $name );
1041                 }
1042
1043                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
1044         }
1045
1046         /**
1047          * Make an external link
1048          * @param string $url URL to link to
1049          * @param string $text Text of link
1050          * @param bool $escape Do we escape the link text?
1051          * @param string $linktype Type of external link. Gets added to the classes
1052          * @param array $attribs Array of extra attributes to <a>
1053          * @param Title|null $title Title object used for title specific link attributes
1054          * @return string
1055          */
1056         public static function makeExternalLink( $url, $text, $escape = true,
1057                 $linktype = '', $attribs = array(), $title = null
1058         ) {
1059                 global $wgTitle;
1060                 $class = "external";
1061                 if ( $linktype ) {
1062                         $class .= " $linktype";
1063                 }
1064                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1065                         $class .= " {$attribs['class']}";
1066                 }
1067                 $attribs['class'] = $class;
1068
1069                 if ( $escape ) {
1070                         $text = htmlspecialchars( $text );
1071                 }
1072
1073                 if ( !$title ) {
1074                         $title = $wgTitle;
1075                 }
1076                 $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
1077                 $link = '';
1078                 $success = Hooks::run( 'LinkerMakeExternalLink',
1079                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
1080                 if ( !$success ) {
1081                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
1082                                 . "with url {$url} and text {$text} to {$link}\n", true );
1083                         return $link;
1084                 }
1085                 $attribs['href'] = $url;
1086                 return Html::rawElement( 'a', $attribs, $text );
1087         }
1088
1089         /**
1090          * Make user link (or user contributions for unregistered users)
1091          * @param int $userId User id in database.
1092          * @param string $userName User name in database.
1093          * @param string $altUserName Text to display instead of the user name (optional)
1094          * @return string HTML fragment
1095          * @since 1.19 Method exists for a long time. $altUserName was added in 1.19.
1096          */
1097         public static function userLink( $userId, $userName, $altUserName = false ) {
1098                 $classes = 'mw-userlink';
1099                 if ( $userId == 0 ) {
1100                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1101                         if ( $altUserName === false ) {
1102                                 $altUserName = IP::prettifyIP( $userName );
1103                         }
1104                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
1105                 } else {
1106                         $page = Title::makeTitle( NS_USER, $userName );
1107                 }
1108
1109                 return self::link(
1110                         $page,
1111                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1112                         array( 'class' => $classes )
1113                 );
1114         }
1115
1116         /**
1117          * Generate standard user tool links (talk, contributions, block link, etc.)
1118          *
1119          * @param int $userId User identifier
1120          * @param string $userText User name or IP address
1121          * @param bool $redContribsWhenNoEdits Should the contributions link be
1122          *   red if the user has no edits?
1123          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
1124          *   and Linker::TOOL_LINKS_EMAIL).
1125          * @param int $edits User edit count (optional, for performance)
1126          * @return string HTML fragment
1127          */
1128         public static function userToolLinks(
1129                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1130         ) {
1131                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1132                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1133                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1134                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1135
1136                 $items = array();
1137                 if ( $talkable ) {
1138                         $items[] = self::userTalkLink( $userId, $userText );
1139                 }
1140                 if ( $userId ) {
1141                         // check if the user has an edit
1142                         $attribs = array();
1143                         if ( $redContribsWhenNoEdits ) {
1144                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1145                                         $user = User::newFromId( $userId );
1146                                         $edits = $user->getEditCount();
1147                                 }
1148                                 if ( $edits === 0 ) {
1149                                         $attribs['class'] = 'new';
1150                                 }
1151                         }
1152                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1153
1154                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1155                 }
1156                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1157                         $items[] = self::blockLink( $userId, $userText );
1158                 }
1159
1160                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1161                         $items[] = self::emailLink( $userId, $userText );
1162                 }
1163
1164                 Hooks::run( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
1165
1166                 if ( $items ) {
1167                         return wfMessage( 'word-separator' )->escaped()
1168                                 . '<span class="mw-usertoollinks">'
1169                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1170                                 . '</span>';
1171                 } else {
1172                         return '';
1173                 }
1174         }
1175
1176         /**
1177          * Alias for userToolLinks( $userId, $userText, true );
1178          * @param int $userId User identifier
1179          * @param string $userText User name or IP address
1180          * @param int $edits User edit count (optional, for performance)
1181          * @return string
1182          */
1183         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1184                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1185         }
1186
1187         /**
1188          * @param int $userId User id in database.
1189          * @param string $userText User name in database.
1190          * @return string HTML fragment with user talk link
1191          */
1192         public static function userTalkLink( $userId, $userText ) {
1193                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1194                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1195                 return $userTalkLink;
1196         }
1197
1198         /**
1199          * @param int $userId Userid
1200          * @param string $userText User name in database.
1201          * @return string HTML fragment with block link
1202          */
1203         public static function blockLink( $userId, $userText ) {
1204                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1205                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1206                 return $blockLink;
1207         }
1208
1209         /**
1210          * @param int $userId Userid
1211          * @param string $userText User name in database.
1212          * @return string HTML fragment with e-mail user link
1213          */
1214         public static function emailLink( $userId, $userText ) {
1215                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1216                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1217                 return $emailLink;
1218         }
1219
1220         /**
1221          * Generate a user link if the current user is allowed to view it
1222          * @param Revision $rev
1223          * @param bool $isPublic Show only if all users can see it
1224          * @return string HTML fragment
1225          */
1226         public static function revUserLink( $rev, $isPublic = false ) {
1227                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1228                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1229                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1230                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1231                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1232                 } else {
1233                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1234                 }
1235                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1236                         return '<span class="history-deleted">' . $link . '</span>';
1237                 }
1238                 return $link;
1239         }
1240
1241         /**
1242          * Generate a user tool link cluster if the current user is allowed to view it
1243          * @param Revision $rev
1244          * @param bool $isPublic Show only if all users can see it
1245          * @return string HTML
1246          */
1247         public static function revUserTools( $rev, $isPublic = false ) {
1248                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1249                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1250                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1251                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1252                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1253                         $link = self::userLink( $userId, $userText )
1254                                 . self::userToolLinks( $userId, $userText );
1255                 } else {
1256                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1257                 }
1258                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1259                         return ' <span class="history-deleted">' . $link . '</span>';
1260                 }
1261                 return $link;
1262         }
1263
1264         /**
1265          * This function is called by all recent changes variants, by the page history,
1266          * and by the user contributions list. It is responsible for formatting edit
1267          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1268          * auto-generated comments (from section editing) and formats [[wikilinks]].
1269          *
1270          * @author Erik Moeller <moeller@scireview.de>
1271          *
1272          * Note: there's not always a title to pass to this function.
1273          * Since you can't set a default parameter for a reference, I've turned it
1274          * temporarily to a value pass. Should be adjusted further. --brion
1275          *
1276          * @param string $comment
1277          * @param Title|null $title Title object (to generate link to the section in autocomment) or null
1278          * @param bool $local Whether section links should refer to local page
1279          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to. For use with external changes.
1280          *
1281          * @return mixed|string
1282          */
1283         public static function formatComment( $comment, $title = null, $local = false, $wikiId = null ) {
1284
1285                 # Sanitize text a bit:
1286                 $comment = str_replace( "\n", " ", $comment );
1287                 # Allow HTML entities (for bug 13815)
1288                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1289
1290                 # Render autocomments and make links:
1291                 $comment = self::formatAutocomments( $comment, $title, $local, $wikiId );
1292                 $comment = self::formatLinksInComment( $comment, $title, $local, $wikiId );
1293
1294                 return $comment;
1295         }
1296
1297         /**
1298          * Converts autogenerated comments in edit summaries into section links.
1299          *
1300          * The pattern for autogen comments is / * foo * /, which makes for
1301          * some nasty regex.
1302          * We look for all comments, match any text before and after the comment,
1303          * add a separator where needed and format the comment itself with CSS
1304          * Called by Linker::formatComment.
1305          *
1306          * @param string $comment Comment text
1307          * @param Title|null $title An optional title object used to links to sections
1308          * @param bool $local Whether section links should refer to local page
1309          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki), as used by WikiMap.
1310          *
1311          * @return string Formatted comment (wikitext)
1312          */
1313         private static function formatAutocomments( $comment, $title = null, $local = false, $wikiId = null ) {
1314                 // @todo $append here is something of a hack to preserve the status
1315                 // quo. Someone who knows more about bidi and such should decide
1316                 // (1) what sane rendering even *is* for an LTR edit summary on an RTL
1317                 // wiki, both when autocomments exist and when they don't, and
1318                 // (2) what markup will make that actually happen.
1319                 $append = '';
1320                 $comment = preg_replace_callback(
1321                         // To detect the presence of content before or after the
1322                         // auto-comment, we use capturing groups inside optional zero-width
1323                         // assertions. But older versions of PCRE can't directly make
1324                         // zero-width assertions optional, so wrap them in a non-capturing
1325                         // group.
1326                         '!(?:(?<=(.)))?/\*\s*(.*?)\s*\*/(?:(?=(.)))?!',
1327                         function ( $match ) use ( $title, $local, $wikiId, &$append ) {
1328                                 global $wgLang;
1329
1330                                 // Ensure all match positions are defined
1331                                 $match += array( '', '', '', '' );
1332
1333                                 $pre = $match[1] !== '';
1334                                 $auto = $match[2];
1335                                 $post = $match[3] !== '';
1336                                 $comment = null;
1337                                 Hooks::run( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local, $wikiId ) );
1338                                 if ( $comment === null ) {
1339                                         $link = '';
1340                                         if ( $title ) {
1341                                                 $section = $auto;
1342                                                 # Remove links that a user may have manually put in the autosummary
1343                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1344                                                 $section = str_replace( '[[:', '', $section );
1345                                                 $section = str_replace( '[[', '', $section );
1346                                                 $section = str_replace( ']]', '', $section );
1347
1348                                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1349                                                 if ( $local ) {
1350                                                         $sectionTitle = Title::newFromText( '#' . $section );
1351                                                 } else {
1352                                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1353                                                                 $title->getDBkey(), $section );
1354                                                 }
1355                                                 if ( $sectionTitle ) {
1356                                                         $link = Linker::makeCommentLink( $sectionTitle, $wgLang->getArrow(), $wikiId, 'noclasses' );
1357                                                 } else {
1358                                                         $link = '';
1359                                                 }
1360                                         }
1361                                         if ( $pre ) {
1362                                                 # written summary $presep autocomment (summary /* section */)
1363                                                 $pre = wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1364                                         }
1365                                         if ( $post ) {
1366                                                 # autocomment $postsep written summary (/* section */ summary)
1367                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1368                                         }
1369                                         $auto = '<span class="autocomment">' . $auto . '</span>';
1370                                         $comment = $pre . $link . $wgLang->getDirMark()
1371                                                 . '<span dir="auto">' . $auto;
1372                                         $append .= '</span>';
1373                                 }
1374                                 return $comment;
1375                         },
1376                         $comment
1377                 );
1378                 return $comment . $append;
1379         }
1380
1381         /**
1382          * Formats wiki links and media links in text; all other wiki formatting
1383          * is ignored
1384          *
1385          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1386          * @param string $comment Text to format links in
1387          * @param Title|null $title An optional title object used to links to sections
1388          * @param bool $local Whether section links should refer to local page
1389          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki), as used by WikiMap.
1390          *
1391          * @return string
1392          */
1393         public static function formatLinksInComment(
1394                 $comment, $title = null, $local = false, $wikiId = null
1395         ) {
1396                 return preg_replace_callback(
1397                         '/
1398                                 \[\[
1399                                 :? # ignore optional leading colon
1400                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1401                                 (?:\|
1402                                         # 2. a pipe-separated substring; only the last is captured
1403                                         # Stop matching at | and ]] without relying on backtracking.
1404                                         ((?:]?[^\]|])*+)
1405                                 )*
1406                                 \]\]
1407                                 ([^[]*) # 3. link trail (the text up until the next link)
1408                         /x',
1409                         function ( $match ) use ( $title, $local, $wikiId ) {
1410                                 global $wgContLang;
1411
1412                                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1413                                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1414
1415                                 $comment = $match[0];
1416
1417                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1418                                 if ( strpos( $match[1], '%' ) !== false ) {
1419                                         $match[1] = strtr(
1420                                                 rawurldecode( $match[1] ),
1421                                                 array( '<' => '&lt;', '>' => '&gt;' )
1422                                         );
1423                                 }
1424
1425                                 # Handle link renaming [[foo|text]] will show link as "text"
1426                                 if ( $match[2] != "" ) {
1427                                         $text = $match[2];
1428                                 } else {
1429                                         $text = $match[1];
1430                                 }
1431                                 $submatch = array();
1432                                 $thelink = null;
1433                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1434                                         # Media link; trail not supported.
1435                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1436                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1437                                         if ( $title ) {
1438                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1439                                         }
1440                                 } else {
1441                                         # Other kind of link
1442                                         if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
1443                                                 $trail = $submatch[1];
1444                                         } else {
1445                                                 $trail = "";
1446                                         }
1447                                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1448                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1449                                                 $match[1] = substr( $match[1], 1 );
1450                                         }
1451                                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1452
1453                                         $linkText = $text;
1454                                         $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1455
1456                                         $target = Title::newFromText( $linkTarget );
1457                                         if ( $target ) {
1458                                                 if ( $target->getText() == '' && !$target->isExternal()
1459                                                         && !$local && $title
1460                                                 ) {
1461                                                         $newTarget = clone ( $title );
1462                                                         $newTarget->setFragment( '#' . $target->getFragment() );
1463                                                         $target = $newTarget;
1464                                                 }
1465
1466                                                 $thelink = Linker::makeCommentLink( $target, $linkText . $inside, $wikiId ) . $trail;
1467                                         }
1468                                 }
1469                                 if ( $thelink ) {
1470                                         // If the link is still valid, go ahead and replace it in!
1471                                         $comment = preg_replace(
1472                                                 $linkRegexp,
1473                                                 StringUtils::escapeRegexReplacement( $thelink ),
1474                                                 $comment,
1475                                                 1
1476                                         );
1477                                 }
1478
1479                                 return $comment;
1480                         },
1481                         $comment
1482                 );
1483         }
1484
1485         /**
1486          * Generates a link to the given Title
1487          *
1488          * @note This is only public for technical reasons. It's not intended for use outside Linker.
1489          *
1490          * @param Title $title
1491          * @param string $text
1492          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki), as used by WikiMap.
1493          * @param string|string[] $options See the $options parameter in Linker::link.
1494          *
1495          * @return string HTML link
1496          */
1497         public static function makeCommentLink( Title $title, $text, $wikiId = null, $options = array() ) {
1498                 if ( $wikiId !== null && !$title->isExternal() ) {
1499                         $link = Linker::makeExternalLink(
1500                                         WikiMap::getForeignURL( $wikiId, $title->getPrefixedText(), $title->getFragment() ),
1501                                         $text,
1502                                         /* escape = */ false // Already escaped
1503                                 );
1504                 } else {
1505                         $link = Linker::link( $title, $text, array(), array(), $options );
1506                 }
1507
1508                 return $link;
1509         }
1510
1511         /**
1512          * @param Title $contextTitle
1513          * @param string $target
1514          * @param string $text
1515          * @return string
1516          */
1517         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1518                 # Valid link forms:
1519                 # Foobar -- normal
1520                 # :Foobar -- override special treatment of prefix (images, language links)
1521                 # /Foobar -- convert to CurrentPage/Foobar
1522                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial and final / from text
1523                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1524                 # ../Foobar -- convert to CurrentPage/Foobar,
1525                 #              (from CurrentPage/CurrentSubPage)
1526                 # ../Foobar/ -- convert to CurrentPage/Foobar, use 'Foobar' as text
1527                 #              (from CurrentPage/CurrentSubPage)
1528
1529                 $ret = $target; # default return value is no change
1530
1531                 # Some namespaces don't allow subpages,
1532                 # so only perform processing if subpages are allowed
1533                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1534                         $hash = strpos( $target, '#' );
1535                         if ( $hash !== false ) {
1536                                 $suffix = substr( $target, $hash );
1537                                 $target = substr( $target, 0, $hash );
1538                         } else {
1539                                 $suffix = '';
1540                         }
1541                         # bug 7425
1542                         $target = trim( $target );
1543                         # Look at the first character
1544                         if ( $target != '' && $target[0] === '/' ) {
1545                                 # / at end means we don't want the slash to be shown
1546                                 $m = array();
1547                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1548                                 if ( $trailingSlashes ) {
1549                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1550                                 } else {
1551                                         $noslash = substr( $target, 1 );
1552                                 }
1553
1554                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1555                                 if ( $text === '' ) {
1556                                         $text = $target . $suffix;
1557                                 } # this might be changed for ugliness reasons
1558                         } else {
1559                                 # check for .. subpage backlinks
1560                                 $dotdotcount = 0;
1561                                 $nodotdot = $target;
1562                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1563                                         ++$dotdotcount;
1564                                         $nodotdot = substr( $nodotdot, 3 );
1565                                 }
1566                                 if ( $dotdotcount > 0 ) {
1567                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1568                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1569                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1570                                                 # / at the end means don't show full path
1571                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1572                                                         $nodotdot = rtrim( $nodotdot, '/' );
1573                                                         if ( $text === '' ) {
1574                                                                 $text = $nodotdot . $suffix;
1575                                                         }
1576                                                 }
1577                                                 $nodotdot = trim( $nodotdot );
1578                                                 if ( $nodotdot != '' ) {
1579                                                         $ret .= '/' . $nodotdot;
1580                                                 }
1581                                                 $ret .= $suffix;
1582                                         }
1583                                 }
1584                         }
1585                 }
1586
1587                 return $ret;
1588         }
1589
1590         /**
1591          * Wrap a comment in standard punctuation and formatting if
1592          * it's non-empty, otherwise return empty string.
1593          *
1594          * @param string $comment
1595          * @param Title|null $title Title object (to generate link to section in autocomment) or null
1596          * @param bool $local Whether section links should refer to local page
1597          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to. For use with external changes.
1598          *
1599          * @return string
1600          */
1601         public static function commentBlock( $comment, $title = null, $local = false, $wikiId = null ) {
1602                 // '*' used to be the comment inserted by the software way back
1603                 // in antiquity in case none was provided, here for backwards
1604                 // compatibility, acc. to brion -ævar
1605                 if ( $comment == '' || $comment == '*' ) {
1606                         return '';
1607                 } else {
1608                         $formatted = self::formatComment( $comment, $title, $local, $wikiId );
1609                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1610                         return " <span class=\"comment\">$formatted</span>";
1611                 }
1612         }
1613
1614         /**
1615          * Wrap and format the given revision's comment block, if the current
1616          * user is allowed to view it.
1617          *
1618          * @param Revision $rev
1619          * @param bool $local Whether section links should refer to local page
1620          * @param bool $isPublic Show only if all users can see it
1621          * @return string HTML fragment
1622          */
1623         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1624                 if ( $rev->getComment( Revision::RAW ) == "" ) {
1625                         return "";
1626                 }
1627                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1628                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1629                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1630                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1631                                 $rev->getTitle(), $local );
1632                 } else {
1633                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1634                 }
1635                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1636                         return " <span class=\"history-deleted\">$block</span>";
1637                 }
1638                 return $block;
1639         }
1640
1641         /**
1642          * @param int $size
1643          * @return string
1644          */
1645         public static function formatRevisionSize( $size ) {
1646                 if ( $size == 0 ) {
1647                         $stxt = wfMessage( 'historyempty' )->escaped();
1648                 } else {
1649                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1650                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1651                 }
1652                 return "<span class=\"history-size\">$stxt</span>";
1653         }
1654
1655         /**
1656          * Add another level to the Table of Contents
1657          *
1658          * @return string
1659          */
1660         public static function tocIndent() {
1661                 return "\n<ul>";
1662         }
1663
1664         /**
1665          * Finish one or more sublevels on the Table of Contents
1666          *
1667          * @param int $level
1668          * @return string
1669          */
1670         public static function tocUnindent( $level ) {
1671                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1672         }
1673
1674         /**
1675          * parameter level defines if we are on an indentation level
1676          *
1677          * @param string $anchor
1678          * @param string $tocline
1679          * @param string $tocnumber
1680          * @param string $level
1681          * @param string|bool $sectionIndex
1682          * @return string
1683          */
1684         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1685                 $classes = "toclevel-$level";
1686                 if ( $sectionIndex !== false ) {
1687                         $classes .= " tocsection-$sectionIndex";
1688                 }
1689                 return "\n<li class=\"$classes\"><a href=\"#" .
1690                         $anchor . '"><span class="tocnumber">' .
1691                         $tocnumber . '</span> <span class="toctext">' .
1692                         $tocline . '</span></a>';
1693         }
1694
1695         /**
1696          * End a Table Of Contents line.
1697          * tocUnindent() will be used instead if we're ending a line below
1698          * the new level.
1699          * @return string
1700          */
1701         public static function tocLineEnd() {
1702                 return "</li>\n";
1703         }
1704
1705         /**
1706          * Wraps the TOC in a table and provides the hide/collapse javascript.
1707          *
1708          * @param string $toc Html of the Table Of Contents
1709          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1710          * @return string Full html of the TOC
1711          */
1712         public static function tocList( $toc, $lang = false ) {
1713                 $lang = wfGetLangObj( $lang );
1714                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1715
1716                 return '<div id="toc" class="toc">'
1717                         . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1718                         . $toc
1719                         . "</ul>\n</div>\n";
1720         }
1721
1722         /**
1723          * Generate a table of contents from a section tree.
1724          *
1725          * @param array $tree Return value of ParserOutput::getSections()
1726          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1727          * @return string HTML fragment
1728          */
1729         public static function generateTOC( $tree, $lang = false ) {
1730                 $toc = '';
1731                 $lastLevel = 0;
1732                 foreach ( $tree as $section ) {
1733                         if ( $section['toclevel'] > $lastLevel ) {
1734                                 $toc .= self::tocIndent();
1735                         } elseif ( $section['toclevel'] < $lastLevel ) {
1736                                 $toc .= self::tocUnindent(
1737                                         $lastLevel - $section['toclevel'] );
1738                         } else {
1739                                 $toc .= self::tocLineEnd();
1740                         }
1741
1742                         $toc .= self::tocLine( $section['anchor'],
1743                                 $section['line'], $section['number'],
1744                                 $section['toclevel'], $section['index'] );
1745                         $lastLevel = $section['toclevel'];
1746                 }
1747                 $toc .= self::tocLineEnd();
1748                 return self::tocList( $toc, $lang );
1749         }
1750
1751         /**
1752          * Create a headline for content
1753          *
1754          * @param int $level The level of the headline (1-6)
1755          * @param string $attribs Any attributes for the headline, starting with
1756          *   a space and ending with '>'
1757          *   This *must* be at least '>' for no attribs
1758          * @param string $anchor The anchor to give the headline (the bit after the #)
1759          * @param string $html Html for the text of the header
1760          * @param string $link HTML to add for the section edit link
1761          * @param bool|string $legacyAnchor A second, optional anchor to give for
1762          *   backward compatibility (false to omit)
1763          *
1764          * @return string HTML headline
1765          */
1766         public static function makeHeadline( $level, $attribs, $anchor, $html,
1767                 $link, $legacyAnchor = false
1768         ) {
1769                 $ret = "<h$level$attribs"
1770                         . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1771                         . $link
1772                         . "</h$level>";
1773                 if ( $legacyAnchor !== false ) {
1774                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1775                 }
1776                 return $ret;
1777         }
1778
1779         /**
1780          * Split a link trail, return the "inside" portion and the remainder of the trail
1781          * as a two-element array
1782          * @param string $trail
1783          * @return array
1784          */
1785         static function splitTrail( $trail ) {
1786                 global $wgContLang;
1787                 $regex = $wgContLang->linkTrail();
1788                 $inside = '';
1789                 if ( $trail !== '' ) {
1790                         $m = array();
1791                         if ( preg_match( $regex, $trail, $m ) ) {
1792                                 $inside = $m[1];
1793                                 $trail = $m[2];
1794                         }
1795                 }
1796                 return array( $inside, $trail );
1797         }
1798
1799         /**
1800          * Generate a rollback link for a given revision.  Currently it's the
1801          * caller's responsibility to ensure that the revision is the top one. If
1802          * it's not, of course, the user will get an error message.
1803          *
1804          * If the calling page is called with the parameter &bot=1, all rollback
1805          * links also get that parameter. It causes the edit itself and the rollback
1806          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1807          * changes, so this allows sysops to combat a busy vandal without bothering
1808          * other users.
1809          *
1810          * If the option verify is set this function will return the link only in case the
1811          * revision can be reverted. Please note that due to performance limitations
1812          * it might be assumed that a user isn't the only contributor of a page while
1813          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1814          * work if $wgShowRollbackEditCount is disabled, so this can only function
1815          * as an additional check.
1816          *
1817          * If the option noBrackets is set the rollback link wont be enclosed in []
1818          *
1819          * @param Revision $rev
1820          * @param IContextSource $context Context to use or null for the main context.
1821          * @param array $options
1822          * @return string
1823          */
1824         public static function generateRollback( $rev, IContextSource $context = null,
1825                 $options = array( 'verify' )
1826         ) {
1827                 if ( $context === null ) {
1828                         $context = RequestContext::getMain();
1829                 }
1830
1831                 $editCount = false;
1832                 if ( in_array( 'verify', $options ) ) {
1833                         $editCount = self::getRollbackEditCount( $rev, true );
1834                         if ( $editCount === false ) {
1835                                 return '';
1836                         }
1837                 }
1838
1839                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1840
1841                 if ( !in_array( 'noBrackets', $options ) ) {
1842                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->escaped();
1843                 }
1844
1845                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1846         }
1847
1848         /**
1849          * This function will return the number of revisions which a rollback
1850          * would revert and, if $verify is set it will verify that a revision
1851          * can be reverted (that the user isn't the only contributor and the
1852          * revision we might rollback to isn't deleted). These checks can only
1853          * function as an additional check as this function only checks against
1854          * the last $wgShowRollbackEditCount edits.
1855          *
1856          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1857          * is set and the user is the only contributor of the page.
1858          *
1859          * @param Revision $rev
1860          * @param bool $verify Try to verify that this revision can really be rolled back
1861          * @return int|bool|null
1862          */
1863         public static function getRollbackEditCount( $rev, $verify ) {
1864                 global $wgShowRollbackEditCount;
1865                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1866                         // Nothing has happened, indicate this by returning 'null'
1867                         return null;
1868                 }
1869
1870                 $dbr = wfGetDB( DB_SLAVE );
1871
1872                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1873                 $res = $dbr->select(
1874                         'revision',
1875                         array( 'rev_user_text', 'rev_deleted' ),
1876                         // $rev->getPage() returns null sometimes
1877                         array( 'rev_page' => $rev->getTitle()->getArticleID() ),
1878                         __METHOD__,
1879                         array(
1880                                 'USE INDEX' => array( 'revision' => 'page_timestamp' ),
1881                                 'ORDER BY' => 'rev_timestamp DESC',
1882                                 'LIMIT' => $wgShowRollbackEditCount + 1
1883                         )
1884                 );
1885
1886                 $editCount = 0;
1887                 $moreRevs = false;
1888                 foreach ( $res as $row ) {
1889                         if ( $rev->getUserText( Revision::RAW ) != $row->rev_user_text ) {
1890                                 if ( $verify &&
1891                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1892                                                 || $row->rev_deleted & Revision::DELETED_USER
1893                                 ) ) {
1894                                         // If the user or the text of the revision we might rollback
1895                                         // to is deleted in some way we can't rollback. Similar to
1896                                         // the sanity checks in WikiPage::commitRollback.
1897                                         return false;
1898                                 }
1899                                 $moreRevs = true;
1900                                 break;
1901                         }
1902                         $editCount++;
1903                 }
1904
1905                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1906                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1907                         // and there weren't any other revisions. That means that the current user is the only
1908                         // editor, so we can't rollback
1909                         return false;
1910                 }
1911                 return $editCount;
1912         }
1913
1914         /**
1915          * Build a raw rollback link, useful for collections of "tool" links
1916          *
1917          * @param Revision $rev
1918          * @param IContextSource|null $context Context to use or null for the main context.
1919          * @param int $editCount Number of edits that would be reverted
1920          * @return string HTML fragment
1921          */
1922         public static function buildRollbackLink( $rev, IContextSource $context = null,
1923                 $editCount = false
1924         ) {
1925                 global $wgShowRollbackEditCount, $wgMiserMode;
1926
1927                 // To config which pages are affected by miser mode
1928                 $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );
1929
1930                 if ( $context === null ) {
1931                         $context = RequestContext::getMain();
1932                 }
1933
1934                 $title = $rev->getTitle();
1935                 $query = array(
1936                         'action' => 'rollback',
1937                         'from' => $rev->getUserText(),
1938                         'token' => $context->getUser()->getEditToken( array(
1939                                 $title->getPrefixedText(),
1940                                 $rev->getUserText()
1941                         ) ),
1942                 );
1943                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1944                         $query['bot'] = '1';
1945                         $query['hidediff'] = '1'; // bug 15999
1946                 }
1947
1948                 $disableRollbackEditCount = false;
1949                 if ( $wgMiserMode ) {
1950                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1951                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1952                                         $disableRollbackEditCount = true;
1953                                         break;
1954                                 }
1955                         }
1956                 }
1957
1958                 if ( !$disableRollbackEditCount
1959                         && is_int( $wgShowRollbackEditCount )
1960                         && $wgShowRollbackEditCount > 0
1961                 ) {
1962                         if ( !is_numeric( $editCount ) ) {
1963                                 $editCount = self::getRollbackEditCount( $rev, false );
1964                         }
1965
1966                         if ( $editCount > $wgShowRollbackEditCount ) {
1967                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
1968                                         ->numParams( $wgShowRollbackEditCount )->parse();
1969                         } else {
1970                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1971                         }
1972
1973                         return self::link(
1974                                 $title,
1975                                 $editCount_output,
1976                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1977                                 $query,
1978                                 array( 'known', 'noclasses' )
1979                         );
1980                 } else {
1981                         return self::link(
1982                                 $title,
1983                                 $context->msg( 'rollbacklink' )->escaped(),
1984                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1985                                 $query,
1986                                 array( 'known', 'noclasses' )
1987                         );
1988                 }
1989         }
1990
1991         /**
1992          * Returns HTML for the "templates used on this page" list.
1993          *
1994          * Make an HTML list of templates, and then add a "More..." link at
1995          * the bottom. If $more is null, do not add a "More..." link. If $more
1996          * is a Title, make a link to that title and use it. If $more is a string,
1997          * directly paste it in as the link (escaping needs to be done manually).
1998          * Finally, if $more is a Message, call toString().
1999          *
2000          * @param array $templates Array of templates from Article::getUsedTemplate or similar
2001          * @param bool $preview Whether this is for a preview
2002          * @param bool $section Whether this is for a section edit
2003          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
2004          * @return string HTML output
2005          */
2006         public static function formatTemplates( $templates, $preview = false,
2007                 $section = false, $more = null
2008         ) {
2009                 global $wgLang;
2010
2011                 $outText = '';
2012                 if ( count( $templates ) > 0 ) {
2013                         # Do a batch existence check
2014                         $batch = new LinkBatch;
2015                         foreach ( $templates as $title ) {
2016                                 $batch->addObj( $title );
2017                         }
2018                         $batch->execute();
2019
2020                         # Construct the HTML
2021                         $outText = '<div class="mw-templatesUsedExplanation">';
2022                         if ( $preview ) {
2023                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
2024                                         ->parseAsBlock();
2025                         } elseif ( $section ) {
2026                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
2027                                         ->parseAsBlock();
2028                         } else {
2029                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
2030                                         ->parseAsBlock();
2031                         }
2032                         $outText .= "</div><ul>\n";
2033
2034                         usort( $templates, 'Title::compare' );
2035                         foreach ( $templates as $titleObj ) {
2036                                 $protected = '';
2037                                 $restrictions = $titleObj->getRestrictions( 'edit' );
2038                                 if ( $restrictions ) {
2039                                         // Check backwards-compatible messages
2040                                         $msg = null;
2041                                         if ( $restrictions === array( 'sysop' ) ) {
2042                                                 $msg = wfMessage( 'template-protected' );
2043                                         } elseif ( $restrictions === array( 'autoconfirmed' ) ) {
2044                                                 $msg = wfMessage( 'template-semiprotected' );
2045                                         }
2046                                         if ( $msg && !$msg->isDisabled() ) {
2047                                                 $protected = $msg->parse();
2048                                         } else {
2049                                                 // Construct the message from restriction-level-*
2050                                                 // e.g. restriction-level-sysop, restriction-level-autoconfirmed
2051                                                 $msgs = array();
2052                                                 foreach ( $restrictions as $r ) {
2053                                                         $msgs[] = wfMessage( "restriction-level-$r" )->parse();
2054                                                 }
2055                                                 $protected = wfMessage( 'parentheses' )
2056                                                         ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
2057                                         }
2058                                 }
2059                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
2060                                         $editLink = self::link(
2061                                                 $titleObj,
2062                                                 wfMessage( 'editlink' )->escaped(),
2063                                                 array(),
2064                                                 array( 'action' => 'edit' )
2065                                         );
2066                                 } else {
2067                                         $editLink = self::link(
2068                                                 $titleObj,
2069                                                 wfMessage( 'viewsourcelink' )->escaped(),
2070                                                 array(),
2071                                                 array( 'action' => 'edit' )
2072                                         );
2073                                 }
2074                                 $outText .= '<li>' . self::link( $titleObj )
2075                                         . wfMessage( 'word-separator' )->escaped()
2076                                         . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
2077                                         . wfMessage( 'word-separator' )->escaped()
2078                                         . $protected . '</li>';
2079                         }
2080
2081                         if ( $more instanceof Title ) {
2082                                 $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
2083                         } elseif ( $more ) {
2084                                 $outText .= "<li>$more</li>";
2085                         }
2086
2087                         $outText .= '</ul>';
2088                 }
2089                 return $outText;
2090         }
2091
2092         /**
2093          * Returns HTML for the "hidden categories on this page" list.
2094          *
2095          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
2096          *   or similar
2097          * @return string HTML output
2098          */
2099         public static function formatHiddenCategories( $hiddencats ) {
2100
2101                 $outText = '';
2102                 if ( count( $hiddencats ) > 0 ) {
2103                         # Construct the HTML
2104                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
2105                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
2106                         $outText .= "</div><ul>\n";
2107
2108                         foreach ( $hiddencats as $titleObj ) {
2109                                 # If it's hidden, it must exist - no need to check with a LinkBatch
2110                                 $outText .= '<li>'
2111                                         . self::link( $titleObj, null, array(), array(), 'known' )
2112                                         . "</li>\n";
2113                         }
2114                         $outText .= '</ul>';
2115                 }
2116                 return $outText;
2117         }
2118
2119         /**
2120          * Format a size in bytes for output, using an appropriate
2121          * unit (B, KB, MB or GB) according to the magnitude in question
2122          *
2123          * @param int $size Size to format
2124          * @return string
2125          */
2126         public static function formatSize( $size ) {
2127                 global $wgLang;
2128                 return htmlspecialchars( $wgLang->formatSize( $size ) );
2129         }
2130
2131         /**
2132          * Given the id of an interface element, constructs the appropriate title
2133          * attribute from the system messages.  (Note, this is usually the id but
2134          * isn't always, because sometimes the accesskey needs to go on a different
2135          * element than the id, for reverse-compatibility, etc.)
2136          *
2137          * @param string $name Id of the element, minus prefixes.
2138          * @param string|null $options Null or the string 'withaccess' to add an access-
2139          *   key hint
2140          * @return string Contents of the title attribute (which you must HTML-
2141          *   escape), or false for no title attribute
2142          */
2143         public static function titleAttrib( $name, $options = null ) {
2144
2145                 $message = wfMessage( "tooltip-$name" );
2146
2147                 if ( !$message->exists() ) {
2148                         $tooltip = false;
2149                 } else {
2150                         $tooltip = $message->text();
2151                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2152                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2153                         # Message equal to '-' means suppress it.
2154                         if ( $tooltip == '-' ) {
2155                                 $tooltip = false;
2156                         }
2157                 }
2158
2159                 if ( $options == 'withaccess' ) {
2160                         $accesskey = self::accesskey( $name );
2161                         if ( $accesskey !== false ) {
2162                                 // Should be build the same as in jquery.accessKeyLabel.js
2163                                 if ( $tooltip === false || $tooltip === '' ) {
2164                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2165                                 } else {
2166                                         $tooltip .= wfMessage( 'word-separator' )->text();
2167                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2168                                 }
2169                         }
2170                 }
2171
2172                 return $tooltip;
2173         }
2174
2175         public static $accesskeycache;
2176
2177         /**
2178          * Given the id of an interface element, constructs the appropriate
2179          * accesskey attribute from the system messages.  (Note, this is usually
2180          * the id but isn't always, because sometimes the accesskey needs to go on
2181          * a different element than the id, for reverse-compatibility, etc.)
2182          *
2183          * @param string $name Id of the element, minus prefixes.
2184          * @return string Contents of the accesskey attribute (which you must HTML-
2185          *   escape), or false for no accesskey attribute
2186          */
2187         public static function accesskey( $name ) {
2188                 if ( isset( self::$accesskeycache[$name] ) ) {
2189                         return self::$accesskeycache[$name];
2190                 }
2191
2192                 $message = wfMessage( "accesskey-$name" );
2193
2194                 if ( !$message->exists() ) {
2195                         $accesskey = false;
2196                 } else {
2197                         $accesskey = $message->plain();
2198                         if ( $accesskey === '' || $accesskey === '-' ) {
2199                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2200                                 # attribute, but this is broken for accesskey: that might be a useful
2201                                 # value.
2202                                 $accesskey = false;
2203                         }
2204                 }
2205
2206                 self::$accesskeycache[$name] = $accesskey;
2207                 return self::$accesskeycache[$name];
2208         }
2209
2210         /**
2211          * Get a revision-deletion link, or disabled link, or nothing, depending
2212          * on user permissions & the settings on the revision.
2213          *
2214          * Will use forward-compatible revision ID in the Special:RevDelete link
2215          * if possible, otherwise the timestamp-based ID which may break after
2216          * undeletion.
2217          *
2218          * @param User $user
2219          * @param Revision $rev
2220          * @param Title $title
2221          * @return string HTML fragment
2222          */
2223         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2224                 $canHide = $user->isAllowed( 'deleterevision' );
2225                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2226                         return '';
2227                 }
2228
2229                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2230                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2231                 } else {
2232                         if ( $rev->getId() ) {
2233                                 // RevDelete links using revision ID are stable across
2234                                 // page deletion and undeletion; use when possible.
2235                                 $query = array(
2236                                         'type' => 'revision',
2237                                         'target' => $title->getPrefixedDBkey(),
2238                                         'ids' => $rev->getId()
2239                                 );
2240                         } else {
2241                                 // Older deleted entries didn't save a revision ID.
2242                                 // We have to refer to these by timestamp, ick!
2243                                 $query = array(
2244                                         'type' => 'archive',
2245                                         'target' => $title->getPrefixedDBkey(),
2246                                         'ids' => $rev->getTimestamp()
2247                                 );
2248                         }
2249                         return Linker::revDeleteLink( $query,
2250                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2251                 }
2252         }
2253
2254         /**
2255          * Creates a (show/hide) link for deleting revisions/log entries
2256          *
2257          * @param array $query Query parameters to be passed to link()
2258          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2259          * @param bool $delete Set to true to use (show/hide) rather than (show)
2260          *
2261          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2262          * span to allow for customization of appearance with CSS
2263          */
2264         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
2265                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2266                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2267                 $html = wfMessage( $msgKey )->escaped();
2268                 $tag = $restricted ? 'strong' : 'span';
2269                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
2270                 return Xml::tags(
2271                         $tag,
2272                         array( 'class' => 'mw-revdelundel-link' ),
2273                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2274                 );
2275         }
2276
2277         /**
2278          * Creates a dead (show/hide) link for deleting revisions/log entries
2279          *
2280          * @param bool $delete Set to true to use (show/hide) rather than (show)
2281          *
2282          * @return string HTML text wrapped in a span to allow for customization
2283          * of appearance with CSS
2284          */
2285         public static function revDeleteLinkDisabled( $delete = true ) {
2286                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2287                 $html = wfMessage( $msgKey )->escaped();
2288                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2289                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
2290         }
2291
2292         /* Deprecated methods */
2293
2294         /**
2295          * @deprecated since 1.16 Use link(); warnings since 1.21
2296          *
2297          * Make a link for a title which may or may not be in the database. If you need to
2298          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
2299          * call to this will result in a DB query.
2300          *
2301          * @param Title $nt The title object to make the link from, e.g. from Title::newFromText.
2302          * @param string $text Link text
2303          * @param string $query Optional query part
2304          * @param string $trail Optional trail. Alphabetic characters at the start of this string will
2305          *   be included in the link text. Other characters will be appended after
2306          *   the end of the link.
2307          * @param string $prefix Optional prefix. As trail, only before instead of after.
2308          * @return string
2309          */
2310         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2311                 wfDeprecated( __METHOD__, '1.21' );
2312
2313                 $query = wfCgiToArray( $query );
2314                 list( $inside, $trail ) = self::splitTrail( $trail );
2315                 if ( $text === '' ) {
2316                         $text = self::linkText( $nt );
2317                 }
2318
2319                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
2320
2321                 return $ret;
2322         }
2323
2324         /**
2325          * @deprecated since 1.16 Use link(); warnings since 1.21
2326          *
2327          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
2328          * it doesn't have to do a database query. It's also valid for interwiki titles and special
2329          * pages.
2330          *
2331          * @param Title $title Title object of target page
2332          * @param string $text Text to replace the title
2333          * @param string $query Link target
2334          * @param string $trail Text after link
2335          * @param string $prefix Text before link text
2336          * @param string $aprops Extra attributes to the a-element
2337          * @param string $style Style to apply - if empty, use getInternalLinkAttributesObj instead
2338          * @return string The a-element
2339          */
2340         static function makeKnownLinkObj(
2341                 $title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
2342         ) {
2343                 wfDeprecated( __METHOD__, '1.21' );
2344
2345                 if ( $text == '' ) {
2346                         $text = self::linkText( $title );
2347                 }
2348                 $attribs = Sanitizer::mergeAttributes(
2349                         Sanitizer::decodeTagAttributes( $aprops ),
2350                         Sanitizer::decodeTagAttributes( $style )
2351                 );
2352                 $query = wfCgiToArray( $query );
2353                 list( $inside, $trail ) = self::splitTrail( $trail );
2354
2355                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
2356                         array( 'known', 'noclasses' ) ) . $trail;
2357
2358                 return $ret;
2359         }
2360
2361         /**
2362          * Returns the attributes for the tooltip and access key.
2363          * @param string $name
2364          * @return array
2365          */
2366         public static function tooltipAndAccesskeyAttribs( $name ) {
2367                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2368                 # no attribute" instead of "output '' as value for attribute", this
2369                 # would be three lines.
2370                 $attribs = array(
2371                         'title' => self::titleAttrib( $name, 'withaccess' ),
2372                         'accesskey' => self::accesskey( $name )
2373                 );
2374                 if ( $attribs['title'] === false ) {
2375                         unset( $attribs['title'] );
2376                 }
2377                 if ( $attribs['accesskey'] === false ) {
2378                         unset( $attribs['accesskey'] );
2379                 }
2380                 return $attribs;
2381         }
2382
2383         /**
2384          * Returns raw bits of HTML, use titleAttrib()
2385          * @param string $name
2386          * @param array|null $options
2387          * @return null|string
2388          */
2389         public static function tooltip( $name, $options = null ) {
2390                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2391                 # no attribute" instead of "output '' as value for attribute", this
2392                 # would be two lines.
2393                 $tooltip = self::titleAttrib( $name, $options );
2394                 if ( $tooltip === false ) {
2395                         return '';
2396                 }
2397                 return Xml::expandAttributes( array(
2398                         'title' => $tooltip
2399                 ) );
2400         }
2401
2402 }
2403
2404 /**
2405  * @since 1.18
2406  */
2407 class DummyLinker {
2408
2409         /**
2410          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2411          * into static calls to the new Linker for backwards compatibility.
2412          *
2413          * @param string $fname Name of called method
2414          * @param array $args Arguments to the method
2415          * @return mixed
2416          */
2417         public function __call( $fname, $args ) {
2418                 return call_user_func_array( array( 'Linker', $fname ), $args );
2419         }
2420 }