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                         # If a thumbnail width has not been provided, it is set
 627                         # to the default user option as specified in Language*.php
 628                         if ( $fp['align'] == '' ) {
 629                                 $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 630                         }
 631                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 632                 }
 633
 634                 if ( $file && isset( $fp['frameless'] ) ) {
 635                         $srcWidth = $file->getWidth( $page );
 636                         # For "frameless" option: do not present an image bigger than the
 637                         # source (for bitmap-style images). This is the same behavior as the
 638                         # "thumb" option does it already.
 639                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 640                                 $hp['width'] = $srcWidth;
 641                         }
 642                 }
 643
 644                 if ( $file && isset( $hp['width'] ) ) {
 645                         # Create a resized image, without the additional thumbnail features
 646                         $thumb = $file->transform( $hp );
 647                 } else {
 648                         $thumb = false;
 649                 }
 650
 651                 if ( !$thumb ) {
 652                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 653                 } else {
 654                         self::processResponsiveImages( $file, $thumb, $hp );
 655                         $params = array(
 656                                 'alt' => $fp['alt'],
 657                                 'title' => $fp['title'],
 658                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 659                                 'img-class' => $fp['class'] );
 660                         if ( isset( $fp['border'] ) ) {
 661                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 662                         }
 663                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 664
 665                         $s = $thumb->toHtml( $params );
 666                 }
 667                 if ( $fp['align'] != '' ) {
 668                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 669                 }
 670                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 671         }
 672
 673         /**
 674          * See makeImageLink()
 675          * When this function is removed, remove if( $parser instanceof Parser ) check there too
 676          * @deprecated since 1.20
 677          */
 678         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 679                 $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
 680                 return self::makeImageLink( null, $title, $file, $frameParams,
 681                         $handlerParams, $time, $query, $widthOption );
 682         }
 683
 684         /**
 685          * Get the link parameters for MediaTransformOutput::toHtml() from given
 686          * frame parameters supplied by the Parser.
 687          * @param array $frameParams The frame parameters
 688          * @param string $query An optional query string to add to description page links
 689          * @param Parser|null $parser
 690          * @return array
 691          */
 692         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 693                 $mtoParams = array();
 694                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 695                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 696                         if ( isset( $frameParams['link-target'] ) ) {
 697                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 698                         }
 699                         if ( $parser ) {
 700                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 701                                 foreach ( $extLinkAttrs as $name => $val ) {
 702                                         // Currently could include 'rel' and 'target'
 703                                         $mtoParams['parser-extlink-' . $name] = $val;
 704                                 }
 705                         }
 706                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 707                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 708                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 709                         // No link
 710                 } else {
 711                         $mtoParams['desc-link'] = true;
 712                         $mtoParams['desc-query'] = $query;
 713                 }
 714                 return $mtoParams;
 715         }
 716
 717         /**
 718          * Make HTML for a thumbnail including image, border and caption
 719          * @param Title $title
 720          * @param File|bool $file File object or false if it doesn't exist
 721          * @param string $label
 722          * @param string $alt
 723          * @param string $align
 724          * @param array $params
 725          * @param bool $framed
 726          * @param string $manualthumb
 727          * @return string
 728          */
 729         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 730                 $align = 'right', $params = array(), $framed = false, $manualthumb = ""
 731         ) {
 732                 $frameParams = array(
 733                         'alt' => $alt,
 734                         'caption' => $label,
 735                         'align' => $align
 736                 );
 737                 if ( $framed ) {
 738                         $frameParams['framed'] = true;
 739                 }
 740                 if ( $manualthumb ) {
 741                         $frameParams['manualthumb'] = $manualthumb;
 742                 }
 743                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 744         }
 745
 746         /**
 747          * @param Title $title
 748          * @param File $file
 749          * @param array $frameParams
 750          * @param array $handlerParams
 751          * @param bool $time
 752          * @param string $query
 753          * @return string
 754          */
 755         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 756                 $handlerParams = array(), $time = false, $query = ""
 757         ) {
 758                 $exists = $file && $file->exists();
 759
 760                 # Shortcuts
 761                 $fp =& $frameParams;
 762                 $hp =& $handlerParams;
 763
 764                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 765                 if ( !isset( $fp['align'] ) ) {
 766                         $fp['align'] = 'right';
 767                 }
 768                 if ( !isset( $fp['alt'] ) ) {
 769                         $fp['alt'] = '';
 770                 }
 771                 if ( !isset( $fp['title'] ) ) {
 772                         $fp['title'] = '';
 773                 }
 774                 if ( !isset( $fp['caption'] ) ) {
 775                         $fp['caption'] = '';
 776                 }
 777
 778                 if ( empty( $hp['width'] ) ) {
 779                         // Reduce width for upright images when parameter 'upright' is used
 780                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 781                 }
 782                 $thumb = false;
 783                 $noscale = false;
 784                 $manualthumb = false;
 785
 786                 if ( !$exists ) {
 787                         $outerWidth = $hp['width'] + 2;
 788                 } else {
 789                         if ( isset( $fp['manualthumb'] ) ) {
 790                                 # Use manually specified thumbnail
 791                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 792                                 if ( $manual_title ) {
 793                                         $manual_img = wfFindFile( $manual_title );
 794                                         if ( $manual_img ) {
 795                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 796                                                 $manualthumb = true;
 797                                         } else {
 798                                                 $exists = false;
 799                                         }
 800                                 }
 801                         } elseif ( isset( $fp['framed'] ) ) {
 802                                 // Use image dimensions, don't scale
 803                                 $thumb = $file->getUnscaledThumb( $hp );
 804                                 $noscale = true;
 805                         } else {
 806                                 # Do not present an image bigger than the source, for bitmap-style images
 807                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 808                                 $srcWidth = $file->getWidth( $page );
 809                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 810                                         $hp['width'] = $srcWidth;
 811                                 }
 812                                 $thumb = $file->transform( $hp );
 813                         }
 814
 815                         if ( $thumb ) {
 816                                 $outerWidth = $thumb->getWidth() + 2;
 817                         } else {
 818                                 $outerWidth = $hp['width'] + 2;
 819                         }
 820                 }
 821
 822                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 823                 # So we don't need to pass it here in $query. However, the URL for the
 824                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 825                 $url = $title->getLocalURL( $query );
 826                 if ( $page ) {
 827                         $url = wfAppendQuery( $url, array( 'page' => $page ) );
 828                 }
 829                 if ( $manualthumb
 830                         && !isset( $fp['link-title'] )
 831                         && !isset( $fp['link-url'] )
 832                         && !isset( $fp['no-link'] ) ) {
 833                         $fp['link-url'] = $url;
 834                 }
 835
 836                 $s = "<div class=\"thumb t{$fp['align']}\">"
 837                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 838
 839                 if ( !$exists ) {
 840                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 841                         $zoomIcon = '';
 842                 } elseif ( !$thumb ) {
 843                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 844                         $zoomIcon = '';
 845                 } else {
 846                         if ( !$noscale && !$manualthumb ) {
 847                                 self::processResponsiveImages( $file, $thumb, $hp );
 848                         }
 849                         $params = array(
 850                                 'alt' => $fp['alt'],
 851                                 'title' => $fp['title'],
 852                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
 853                                         ? $fp['class'] . ' '
 854                                         : '' ) . 'thumbimage'
 855                         );
 856                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 857                         $s .= $thumb->toHtml( $params );
 858                         if ( isset( $fp['framed'] ) ) {
 859                                 $zoomIcon = "";
 860                         } else {
 861                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 862                                         Html::rawElement( 'a', array(
 863                                                 'href' => $url,
 864                                                 'class' => 'internal',
 865                                                 'title' => wfMessage( 'thumbnail-more' )->text() ),
 866                                                 "" ) );
 867                         }
 868                 }
 869                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 870                 return str_replace( "\n", ' ', $s );
 871         }
 872
 873         /**
 874          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 875          * applicable.
 876          *
 877          * @param File $file
 878          * @param MediaTransformOutput $thumb
 879          * @param array $hp Image parameters
 880          */
 881         public static function processResponsiveImages( $file, $thumb, $hp ) {
 882                 global $wgResponsiveImages;
 883                 if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
 884                         $hp15 = $hp;
 885                         $hp15['width'] = round( $hp['width'] * 1.5 );
 886                         $hp20 = $hp;
 887                         $hp20['width'] = $hp['width'] * 2;
 888                         if ( isset( $hp['height'] ) ) {
 889                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 890                                 $hp20['height'] = $hp['height'] * 2;
 891                         }
 892
 893                         $thumb15 = $file->transform( $hp15 );
 894                         $thumb20 = $file->transform( $hp20 );
 895                         if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
 896                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 897                         }
 898                         if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
 899                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 900                         }
 901                 }
 902         }
 903
 904         /**
 905          * Make a "broken" link to an image
 906          *
 907          * @param Title $title
 908          * @param string $label Link label (plain text)
 909          * @param string $query Query string
 910          * @param string $unused1 Unused parameter kept for b/c
 911          * @param string $unused2 Unused parameter kept for b/c
 912          * @param bool $time A file of a certain timestamp was requested
 913          * @return string
 914          */
 915         public static function makeBrokenImageLinkObj( $title, $label = '',
 916                 $query = '', $unused1 = '', $unused2 = '', $time = false
 917         ) {
 918                 if ( !$title instanceof Title ) {
 919                         wfWarn( __METHOD__ . ': Requires $title to be a Title object.' );
 920                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 921                 }
 922
 923                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 924                 if ( $label == '' ) {
 925                         $label = $title->getPrefixedText();
 926                 }
 927                 $encLabel = htmlspecialchars( $label );
 928                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 929
 930                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 931                         && !$currentExists
 932                 ) {
 933                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 934
 935                         if ( $redir ) {
 936                                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 937                         }
 938
 939                         $href = self::getUploadUrl( $title, $query );
 940
 941                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 942                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 943                                 $encLabel . '</a>';
 944                 }
 945
 946                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 947         }
 948
 949         /**
 950          * Get the URL to upload a certain file
 951          *
 952          * @param Title $destFile Title object of the file to upload
 953          * @param string $query Urlencoded query string to prepend
 954          * @return string Urlencoded URL
 955          */
 956         protected static function getUploadUrl( $destFile, $query = '' ) {
 957                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 958                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 959                 if ( $query != '' ) {
 960                         $q .= '&' . $query;
 961                 }
 962
 963                 if ( $wgUploadMissingFileUrl ) {
 964                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 965                 } elseif ( $wgUploadNavigationUrl ) {
 966                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 967                 } else {
 968                         $upload = SpecialPage::getTitleFor( 'Upload' );
 969                         return $upload->getLocalURL( $q );
 970                 }
 971         }
 972
 973         /**
 974          * Create a direct link to a given uploaded file.
 975          *
 976          * @param Title $title
 977          * @param string $html Pre-sanitized HTML
 978          * @param string $time MW timestamp of file creation time
 979          * @return string HTML
 980          */
 981         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 982                 $img = wfFindFile( $title, array( 'time' => $time ) );
 983                 return self::makeMediaLinkFile( $title, $img, $html );
 984         }
 985
 986         /**
 987          * Create a direct link to a given uploaded file.
 988          * This will make a broken link if $file is false.
 989          *
 990          * @param Title $title
 991          * @param File|bool $file File object or false
 992          * @param string $html Pre-sanitized HTML
 993          * @return string HTML
 994          *
 995          * @todo Handle invalid or missing images better.
 996          */
 997         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
 998                 if ( $file && $file->exists() ) {
 999                         $url = $file->getURL();
1000                         $class = 'internal';
1001                 } else {
1002                         $url = self::getUploadUrl( $title );
1003                         $class = 'new';
1004                 }
1005
1006                 $alt = $title->getText();
1007                 if ( $html == '' ) {
1008                         $html = $alt;
1009                 }
1010
1011                 $ret = '';
1012                 $attribs = array(
1013                         'href' => $url,
1014                         'class' => $class,
1015                         'title' => $alt
1016                 );
1017
1018                 if ( !Hooks::run( 'LinkerMakeMediaLinkFile',
1019                         array( $title, $file, &$html, &$attribs, &$ret ) ) ) {
1020                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
1021                                 . "with url {$url} and text {$html} to {$ret}\n", true );
1022                         return $ret;
1023                 }
1024
1025                 return Html::rawElement( 'a', $attribs, $html );
1026         }
1027
1028         /**
1029          * Make a link to a special page given its name and, optionally,
1030          * a message key from the link text.
1031          * Usage example: Linker::specialLink( 'Recentchanges' )
1032          *
1033          * @param string $name
1034          * @param string $key
1035          * @return string
1036          */
1037         public static function specialLink( $name, $key = '' ) {
1038                 if ( $key == '' ) {
1039                         $key = strtolower( $name );
1040                 }
1041
1042                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
1043         }
1044
1045         /**
1046          * Make an external link
1047          * @param string $url URL to link to
1048          * @param string $text Text of link
1049          * @param bool $escape Do we escape the link text?
1050          * @param string $linktype Type of external link. Gets added to the classes
1051          * @param array $attribs Array of extra attributes to <a>
1052          * @param Title|null $title Title object used for title specific link attributes
1053          * @return string
1054          */
1055         public static function makeExternalLink( $url, $text, $escape = true,
1056                 $linktype = '', $attribs = array(), $title = null
1057         ) {
1058                 global $wgTitle;
1059                 $class = "external";
1060                 if ( $linktype ) {
1061                         $class .= " $linktype";
1062                 }
1063                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1064                         $class .= " {$attribs['class']}";
1065                 }
1066                 $attribs['class'] = $class;
1067
1068                 if ( $escape ) {
1069                         $text = htmlspecialchars( $text );
1070                 }
1071
1072                 if ( !$title ) {
1073                         $title = $wgTitle;
1074                 }
1075                 $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
1076                 $link = '';
1077                 $success = Hooks::run( 'LinkerMakeExternalLink',
1078                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
1079                 if ( !$success ) {
1080                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
1081                                 . "with url {$url} and text {$text} to {$link}\n", true );
1082                         return $link;
1083                 }
1084                 $attribs['href'] = $url;
1085                 return Html::rawElement( 'a', $attribs, $text );
1086         }
1087
1088         /**
1089          * Make user link (or user contributions for unregistered users)
1090          * @param int $userId User id in database.
1091          * @param string $userName User name in database.
1092          * @param string $altUserName Text to display instead of the user name (optional)
1093          * @return string HTML fragment
1094          * @since 1.19 Method exists for a long time. $altUserName was added in 1.19.
1095          */
1096         public static function userLink( $userId, $userName, $altUserName = false ) {
1097                 $classes = 'mw-userlink';
1098                 if ( $userId == 0 ) {
1099                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1100                         if ( $altUserName === false ) {
1101                                 $altUserName = IP::prettifyIP( $userName );
1102                         }
1103                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
1104                 } else {
1105                         $page = Title::makeTitle( NS_USER, $userName );
1106                 }
1107
1108                 return self::link(
1109                         $page,
1110                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1111                         array( 'class' => $classes )
1112                 );
1113         }
1114
1115         /**
1116          * Generate standard user tool links (talk, contributions, block link, etc.)
1117          *
1118          * @param int $userId User identifier
1119          * @param string $userText User name or IP address
1120          * @param bool $redContribsWhenNoEdits Should the contributions link be
1121          *   red if the user has no edits?
1122          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
1123          *   and Linker::TOOL_LINKS_EMAIL).
1124          * @param int $edits User edit count (optional, for performance)
1125          * @return string HTML fragment
1126          */
1127         public static function userToolLinks(
1128                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1129         ) {
1130                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1131                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1132                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1133                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1134
1135                 $items = array();
1136                 if ( $talkable ) {
1137                         $items[] = self::userTalkLink( $userId, $userText );
1138                 }
1139                 if ( $userId ) {
1140                         // check if the user has an edit
1141                         $attribs = array();
1142                         if ( $redContribsWhenNoEdits ) {
1143                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1144                                         $user = User::newFromId( $userId );
1145                                         $edits = $user->getEditCount();
1146                                 }
1147                                 if ( $edits === 0 ) {
1148                                         $attribs['class'] = 'new';
1149                                 }
1150                         }
1151                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1152
1153                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1154                 }
1155                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1156                         $items[] = self::blockLink( $userId, $userText );
1157                 }
1158
1159                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1160                         $items[] = self::emailLink( $userId, $userText );
1161                 }
1162
1163                 Hooks::run( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
1164
1165                 if ( $items ) {
1166                         return wfMessage( 'word-separator' )->escaped()
1167                                 . '<span class="mw-usertoollinks">'
1168                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1169                                 . '</span>';
1170                 } else {
1171                         return '';
1172                 }
1173         }
1174
1175         /**
1176          * Alias for userToolLinks( $userId, $userText, true );
1177          * @param int $userId User identifier
1178          * @param string $userText User name or IP address
1179          * @param int $edits User edit count (optional, for performance)
1180          * @return string
1181          */
1182         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1183                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1184         }
1185
1186         /**
1187          * @param int $userId User id in database.
1188          * @param string $userText User name in database.
1189          * @return string HTML fragment with user talk link
1190          */
1191         public static function userTalkLink( $userId, $userText ) {
1192                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1193                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1194                 return $userTalkLink;
1195         }
1196
1197         /**
1198          * @param int $userId Userid
1199          * @param string $userText User name in database.
1200          * @return string HTML fragment with block link
1201          */
1202         public static function blockLink( $userId, $userText ) {
1203                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1204                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1205                 return $blockLink;
1206         }
1207
1208         /**
1209          * @param int $userId Userid
1210          * @param string $userText User name in database.
1211          * @return string HTML fragment with e-mail user link
1212          */
1213         public static function emailLink( $userId, $userText ) {
1214                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1215                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1216                 return $emailLink;
1217         }
1218
1219         /**
1220          * Generate a user link if the current user is allowed to view it
1221          * @param Revision $rev
1222          * @param bool $isPublic Show only if all users can see it
1223          * @return string HTML fragment
1224          */
1225         public static function revUserLink( $rev, $isPublic = false ) {
1226                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1227                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1228                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1229                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1230                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1231                 } else {
1232                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1233                 }
1234                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1235                         return '<span class="history-deleted">' . $link . '</span>';
1236                 }
1237                 return $link;
1238         }
1239
1240         /**
1241          * Generate a user tool link cluster if the current user is allowed to view it
1242          * @param Revision $rev
1243          * @param bool $isPublic Show only if all users can see it
1244          * @return string HTML
1245          */
1246         public static function revUserTools( $rev, $isPublic = false ) {
1247                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1248                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1249                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1250                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1251                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1252                         $link = self::userLink( $userId, $userText )
1253                                 . self::userToolLinks( $userId, $userText );
1254                 } else {
1255                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1256                 }
1257                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1258                         return ' <span class="history-deleted">' . $link . '</span>';
1259                 }
1260                 return $link;
1261         }
1262
1263         /**
1264          * This function is called by all recent changes variants, by the page history,
1265          * and by the user contributions list. It is responsible for formatting edit
1266          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1267          * auto-generated comments (from section editing) and formats [[wikilinks]].
1268          *
1269          * @author Erik Moeller <moeller@scireview.de>
1270          *
1271          * Note: there's not always a title to pass to this function.
1272          * Since you can't set a default parameter for a reference, I've turned it
1273          * temporarily to a value pass. Should be adjusted further. --brion
1274          *
1275          * @param string $comment
1276          * @param Title|null $title Title object (to generate link to the section in autocomment)
1277          *  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.
1280          *  For use with external changes.
1281          *
1282          * @return mixed|string
1283          */
1284         public static function formatComment(
1285                 $comment, $title = null, $local = false, $wikiId = null
1286         ) {
1287                 # Sanitize text a bit:
1288                 $comment = str_replace( "\n", " ", $comment );
1289                 # Allow HTML entities (for bug 13815)
1290                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1291
1292                 # Render autocomments and make links:
1293                 $comment = self::formatAutocomments( $comment, $title, $local, $wikiId );
1294                 $comment = self::formatLinksInComment( $comment, $title, $local, $wikiId );
1295
1296                 return $comment;
1297         }
1298
1299         /**
1300          * Converts autogenerated comments in edit summaries into section links.
1301          *
1302          * The pattern for autogen comments is / * foo * /, which makes for
1303          * some nasty regex.
1304          * We look for all comments, match any text before and after the comment,
1305          * add a separator where needed and format the comment itself with CSS
1306          * Called by Linker::formatComment.
1307          *
1308          * @param string $comment Comment text
1309          * @param Title|null $title An optional title object used to links to sections
1310          * @param bool $local Whether section links should refer to local page
1311          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1312          *  as used by WikiMap.
1313          *
1314          * @return string Formatted comment (wikitext)
1315          */
1316         private static function formatAutocomments(
1317                 $comment, $title = null, $local = false, $wikiId = null
1318         ) {
1319                 // @todo $append here is something of a hack to preserve the status
1320                 // quo. Someone who knows more about bidi and such should decide
1321                 // (1) what sane rendering even *is* for an LTR edit summary on an RTL
1322                 // wiki, both when autocomments exist and when they don't, and
1323                 // (2) what markup will make that actually happen.
1324                 $append = '';
1325                 $comment = preg_replace_callback(
1326                         // To detect the presence of content before or after the
1327                         // auto-comment, we use capturing groups inside optional zero-width
1328                         // assertions. But older versions of PCRE can't directly make
1329                         // zero-width assertions optional, so wrap them in a non-capturing
1330                         // group.
1331                         '!(?:(?<=(.)))?/\*\s*(.*?)\s*\*/(?:(?=(.)))?!',
1332                         function ( $match ) use ( $title, $local, $wikiId, &$append ) {
1333                                 global $wgLang;
1334
1335                                 // Ensure all match positions are defined
1336                                 $match += array( '', '', '', '' );
1337
1338                                 $pre = $match[1] !== '';
1339                                 $auto = $match[2];
1340                                 $post = $match[3] !== '';
1341                                 $comment = null;
1342
1343                                 Hooks::run(
1344                                         'FormatAutocomments',
1345                                         array( &$comment, $pre, $auto, $post, $title, $local, $wikiId )
1346                                 );
1347
1348                                 if ( $comment === null ) {
1349                                         $link = '';
1350                                         if ( $title ) {
1351                                                 $section = $auto;
1352                                                 # Remove links that a user may have manually put in the autosummary
1353                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1354                                                 $section = str_replace( '[[:', '', $section );
1355                                                 $section = str_replace( '[[', '', $section );
1356                                                 $section = str_replace( ']]', '', $section );
1357
1358                                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1359                                                 if ( $local ) {
1360                                                         $sectionTitle = Title::newFromText( '#' . $section );
1361                                                 } else {
1362                                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1363                                                                 $title->getDBkey(), $section );
1364                                                 }
1365                                                 if ( $sectionTitle ) {
1366                                                         $link = Linker::makeCommentLink( $sectionTitle, $wgLang->getArrow(), $wikiId, 'noclasses' );
1367                                                 } else {
1368                                                         $link = '';
1369                                                 }
1370                                         }
1371                                         if ( $pre ) {
1372                                                 # written summary $presep autocomment (summary /* section */)
1373                                                 $pre = wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1374                                         }
1375                                         if ( $post ) {
1376                                                 # autocomment $postsep written summary (/* section */ summary)
1377                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1378                                         }
1379                                         $auto = '<span class="autocomment">' . $auto . '</span>';
1380                                         $comment = $pre . $link . $wgLang->getDirMark()
1381                                                 . '<span dir="auto">' . $auto;
1382                                         $append .= '</span>';
1383                                 }
1384                                 return $comment;
1385                         },
1386                         $comment
1387                 );
1388                 return $comment . $append;
1389         }
1390
1391         /**
1392          * Formats wiki links and media links in text; all other wiki formatting
1393          * is ignored
1394          *
1395          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1396          * @param string $comment Text to format links in
1397          * @param Title|null $title An optional title object used to links to sections
1398          * @param bool $local Whether section links should refer to local page
1399          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1400          *  as used by WikiMap.
1401          *
1402          * @return string
1403          */
1404         public static function formatLinksInComment(
1405                 $comment, $title = null, $local = false, $wikiId = null
1406         ) {
1407                 return preg_replace_callback(
1408                         '/
1409                                 \[\[
1410                                 :? # ignore optional leading colon
1411                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1412                                 (?:\|
1413                                         # 2. a pipe-separated substring; only the last is captured
1414                                         # Stop matching at | and ]] without relying on backtracking.
1415                                         ((?:]?[^\]|])*+)
1416                                 )*
1417                                 \]\]
1418                                 ([^[]*) # 3. link trail (the text up until the next link)
1419                         /x',
1420                         function ( $match ) use ( $title, $local, $wikiId ) {
1421                                 global $wgContLang;
1422
1423                                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1424                                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1425
1426                                 $comment = $match[0];
1427
1428                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1429                                 if ( strpos( $match[1], '%' ) !== false ) {
1430                                         $match[1] = strtr(
1431                                                 rawurldecode( $match[1] ),
1432                                                 array( '<' => '&lt;', '>' => '&gt;' )
1433                                         );
1434                                 }
1435
1436                                 # Handle link renaming [[foo|text]] will show link as "text"
1437                                 if ( $match[2] != "" ) {
1438                                         $text = $match[2];
1439                                 } else {
1440                                         $text = $match[1];
1441                                 }
1442                                 $submatch = array();
1443                                 $thelink = null;
1444                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1445                                         # Media link; trail not supported.
1446                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1447                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1448                                         if ( $title ) {
1449                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1450                                         }
1451                                 } else {
1452                                         # Other kind of link
1453                                         if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
1454                                                 $trail = $submatch[1];
1455                                         } else {
1456                                                 $trail = "";
1457                                         }
1458                                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1459                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1460                                                 $match[1] = substr( $match[1], 1 );
1461                                         }
1462                                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1463
1464                                         $linkText = $text;
1465                                         $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1466
1467                                         if ( $linkTarget !== null ) {
1468                                                 $target = Title::newFromText( $linkTarget );
1469                                                 if ( $target ) {
1470                                                         if ( $target->getText() == '' && !$target->isExternal()
1471                                                                 && !$local && $title
1472                                                         ) {
1473                                                                 $newTarget = clone $title;
1474                                                                 $newTarget->setFragment( '#' . $target->getFragment() );
1475                                                                 $target = $newTarget;
1476                                                         }
1477
1478                                                         $thelink = Linker::makeCommentLink( $target, $linkText . $inside, $wikiId ) . $trail;
1479                                                 }
1480                                         }
1481                                 }
1482                                 if ( $thelink ) {
1483                                         // If the link is still valid, go ahead and replace it in!
1484                                         $comment = preg_replace(
1485                                                 $linkRegexp,
1486                                                 StringUtils::escapeRegexReplacement( $thelink ),
1487                                                 $comment,
1488                                                 1
1489                                         );
1490                                 }
1491
1492                                 return $comment;
1493                         },
1494                         $comment
1495                 );
1496         }
1497
1498         /**
1499          * Generates a link to the given Title
1500          *
1501          * @note This is only public for technical reasons. It's not intended for use outside Linker.
1502          *
1503          * @param Title $title
1504          * @param string $text
1505          * @param string|null $wikiId Id of the wiki to link to (if not the local wiki),
1506          *  as used by WikiMap.
1507          * @param string|string[] $options See the $options parameter in Linker::link.
1508          *
1509          * @return string HTML link
1510          */
1511         public static function makeCommentLink(
1512                 Title $title, $text, $wikiId = null, $options = array()
1513         ) {
1514                 if ( $wikiId !== null && !$title->isExternal() ) {
1515                         $link = Linker::makeExternalLink(
1516                                 WikiMap::getForeignURL(
1517                                         $wikiId,
1518                                         $title->getPrefixedText(),
1519                                         $title->getFragment()
1520                                 ),
1521                                 $text,
1522                                 /* escape = */ false // Already escaped
1523                         );
1524                 } else {
1525                         $link = Linker::link( $title, $text, array(), array(), $options );
1526                 }
1527
1528                 return $link;
1529         }
1530
1531         /**
1532          * @param Title $contextTitle
1533          * @param string $target
1534          * @param string $text
1535          * @return string
1536          */
1537         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1538                 # Valid link forms:
1539                 # Foobar -- normal
1540                 # :Foobar -- override special treatment of prefix (images, language links)
1541                 # /Foobar -- convert to CurrentPage/Foobar
1542                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial and final / from text
1543                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1544                 # ../Foobar -- convert to CurrentPage/Foobar,
1545                 #              (from CurrentPage/CurrentSubPage)
1546                 # ../Foobar/ -- convert to CurrentPage/Foobar, use 'Foobar' as text
1547                 #              (from CurrentPage/CurrentSubPage)
1548
1549                 $ret = $target; # default return value is no change
1550
1551                 # Some namespaces don't allow subpages,
1552                 # so only perform processing if subpages are allowed
1553                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1554                         $hash = strpos( $target, '#' );
1555                         if ( $hash !== false ) {
1556                                 $suffix = substr( $target, $hash );
1557                                 $target = substr( $target, 0, $hash );
1558                         } else {
1559                                 $suffix = '';
1560                         }
1561                         # bug 7425
1562                         $target = trim( $target );
1563                         # Look at the first character
1564                         if ( $target != '' && $target[0] === '/' ) {
1565                                 # / at end means we don't want the slash to be shown
1566                                 $m = array();
1567                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1568                                 if ( $trailingSlashes ) {
1569                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1570                                 } else {
1571                                         $noslash = substr( $target, 1 );
1572                                 }
1573
1574                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1575                                 if ( $text === '' ) {
1576                                         $text = $target . $suffix;
1577                                 } # this might be changed for ugliness reasons
1578                         } else {
1579                                 # check for .. subpage backlinks
1580                                 $dotdotcount = 0;
1581                                 $nodotdot = $target;
1582                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1583                                         ++$dotdotcount;
1584                                         $nodotdot = substr( $nodotdot, 3 );
1585                                 }
1586                                 if ( $dotdotcount > 0 ) {
1587                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1588                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1589                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1590                                                 # / at the end means don't show full path
1591                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1592                                                         $nodotdot = rtrim( $nodotdot, '/' );
1593                                                         if ( $text === '' ) {
1594                                                                 $text = $nodotdot . $suffix;
1595                                                         }
1596                                                 }
1597                                                 $nodotdot = trim( $nodotdot );
1598                                                 if ( $nodotdot != '' ) {
1599                                                         $ret .= '/' . $nodotdot;
1600                                                 }
1601                                                 $ret .= $suffix;
1602                                         }
1603                                 }
1604                         }
1605                 }
1606
1607                 return $ret;
1608         }
1609
1610         /**
1611          * Wrap a comment in standard punctuation and formatting if
1612          * it's non-empty, otherwise return empty string.
1613          *
1614          * @param string $comment
1615          * @param Title|null $title Title object (to generate link to section in autocomment) or null
1616          * @param bool $local Whether section links should refer to local page
1617          * @param string|null $wikiId Id (as used by WikiMap) of the wiki to generate links to.
1618          *  For use with external changes.
1619          *
1620          * @return string
1621          */
1622         public static function commentBlock(
1623                 $comment, $title = null, $local = false, $wikiId = null
1624         ) {
1625                 // '*' used to be the comment inserted by the software way back
1626                 // in antiquity in case none was provided, here for backwards
1627                 // compatibility, acc. to brion -ævar
1628                 if ( $comment == '' || $comment == '*' ) {
1629                         return '';
1630                 } else {
1631                         $formatted = self::formatComment( $comment, $title, $local, $wikiId );
1632                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1633                         return " <span class=\"comment\">$formatted</span>";
1634                 }
1635         }
1636
1637         /**
1638          * Wrap and format the given revision's comment block, if the current
1639          * user is allowed to view it.
1640          *
1641          * @param Revision $rev
1642          * @param bool $local Whether section links should refer to local page
1643          * @param bool $isPublic Show only if all users can see it
1644          * @return string HTML fragment
1645          */
1646         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1647                 if ( $rev->getComment( Revision::RAW ) == "" ) {
1648                         return "";
1649                 }
1650                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1651                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1652                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1653                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1654                                 $rev->getTitle(), $local );
1655                 } else {
1656                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1657                 }
1658                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1659                         return " <span class=\"history-deleted\">$block</span>";
1660                 }
1661                 return $block;
1662         }
1663
1664         /**
1665          * @param int $size
1666          * @return string
1667          */
1668         public static function formatRevisionSize( $size ) {
1669                 if ( $size == 0 ) {
1670                         $stxt = wfMessage( 'historyempty' )->escaped();
1671                 } else {
1672                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1673                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1674                 }
1675                 return "<span class=\"history-size\">$stxt</span>";
1676         }
1677
1678         /**
1679          * Add another level to the Table of Contents
1680          *
1681          * @return string
1682          */
1683         public static function tocIndent() {
1684                 return "\n<ul>";
1685         }
1686
1687         /**
1688          * Finish one or more sublevels on the Table of Contents
1689          *
1690          * @param int $level
1691          * @return string
1692          */
1693         public static function tocUnindent( $level ) {
1694                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1695         }
1696
1697         /**
1698          * parameter level defines if we are on an indentation level
1699          *
1700          * @param string $anchor
1701          * @param string $tocline
1702          * @param string $tocnumber
1703          * @param string $level
1704          * @param string|bool $sectionIndex
1705          * @return string
1706          */
1707         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1708                 $classes = "toclevel-$level";
1709                 if ( $sectionIndex !== false ) {
1710                         $classes .= " tocsection-$sectionIndex";
1711                 }
1712                 return "\n<li class=\"$classes\"><a href=\"#" .
1713                         $anchor . '"><span class="tocnumber">' .
1714                         $tocnumber . '</span> <span class="toctext">' .
1715                         $tocline . '</span></a>';
1716         }
1717
1718         /**
1719          * End a Table Of Contents line.
1720          * tocUnindent() will be used instead if we're ending a line below
1721          * the new level.
1722          * @return string
1723          */
1724         public static function tocLineEnd() {
1725                 return "</li>\n";
1726         }
1727
1728         /**
1729          * Wraps the TOC in a table and provides the hide/collapse javascript.
1730          *
1731          * @param string $toc Html of the Table Of Contents
1732          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1733          * @return string Full html of the TOC
1734          */
1735         public static function tocList( $toc, $lang = false ) {
1736                 $lang = wfGetLangObj( $lang );
1737                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1738
1739                 return '<div id="toc" class="toc">'
1740                         . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1741                         . $toc
1742                         . "</ul>\n</div>\n";
1743         }
1744
1745         /**
1746          * Generate a table of contents from a section tree.
1747          *
1748          * @param array $tree Return value of ParserOutput::getSections()
1749          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1750          * @return string HTML fragment
1751          */
1752         public static function generateTOC( $tree, $lang = false ) {
1753                 $toc = '';
1754                 $lastLevel = 0;
1755                 foreach ( $tree as $section ) {
1756                         if ( $section['toclevel'] > $lastLevel ) {
1757                                 $toc .= self::tocIndent();
1758                         } elseif ( $section['toclevel'] < $lastLevel ) {
1759                                 $toc .= self::tocUnindent(
1760                                         $lastLevel - $section['toclevel'] );
1761                         } else {
1762                                 $toc .= self::tocLineEnd();
1763                         }
1764
1765                         $toc .= self::tocLine( $section['anchor'],
1766                                 $section['line'], $section['number'],
1767                                 $section['toclevel'], $section['index'] );
1768                         $lastLevel = $section['toclevel'];
1769                 }
1770                 $toc .= self::tocLineEnd();
1771                 return self::tocList( $toc, $lang );
1772         }
1773
1774         /**
1775          * Create a headline for content
1776          *
1777          * @param int $level The level of the headline (1-6)
1778          * @param string $attribs Any attributes for the headline, starting with
1779          *   a space and ending with '>'
1780          *   This *must* be at least '>' for no attribs
1781          * @param string $anchor The anchor to give the headline (the bit after the #)
1782          * @param string $html Html for the text of the header
1783          * @param string $link HTML to add for the section edit link
1784          * @param bool|string $legacyAnchor A second, optional anchor to give for
1785          *   backward compatibility (false to omit)
1786          *
1787          * @return string HTML headline
1788          */
1789         public static function makeHeadline( $level, $attribs, $anchor, $html,
1790                 $link, $legacyAnchor = false
1791         ) {
1792                 $ret = "<h$level$attribs"
1793                         . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1794                         . $link
1795                         . "</h$level>";
1796                 if ( $legacyAnchor !== false ) {
1797                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1798                 }
1799                 return $ret;
1800         }
1801
1802         /**
1803          * Split a link trail, return the "inside" portion and the remainder of the trail
1804          * as a two-element array
1805          * @param string $trail
1806          * @return array
1807          */
1808         static function splitTrail( $trail ) {
1809                 global $wgContLang;
1810                 $regex = $wgContLang->linkTrail();
1811                 $inside = '';
1812                 if ( $trail !== '' ) {
1813                         $m = array();
1814                         if ( preg_match( $regex, $trail, $m ) ) {
1815                                 $inside = $m[1];
1816                                 $trail = $m[2];
1817                         }
1818                 }
1819                 return array( $inside, $trail );
1820         }
1821
1822         /**
1823          * Generate a rollback link for a given revision.  Currently it's the
1824          * caller's responsibility to ensure that the revision is the top one. If
1825          * it's not, of course, the user will get an error message.
1826          *
1827          * If the calling page is called with the parameter &bot=1, all rollback
1828          * links also get that parameter. It causes the edit itself and the rollback
1829          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1830          * changes, so this allows sysops to combat a busy vandal without bothering
1831          * other users.
1832          *
1833          * If the option verify is set this function will return the link only in case the
1834          * revision can be reverted. Please note that due to performance limitations
1835          * it might be assumed that a user isn't the only contributor of a page while
1836          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1837          * work if $wgShowRollbackEditCount is disabled, so this can only function
1838          * as an additional check.
1839          *
1840          * If the option noBrackets is set the rollback link wont be enclosed in []
1841          *
1842          * @param Revision $rev
1843          * @param IContextSource $context Context to use or null for the main context.
1844          * @param array $options
1845          * @return string
1846          */
1847         public static function generateRollback( $rev, IContextSource $context = null,
1848                 $options = array( 'verify' )
1849         ) {
1850                 if ( $context === null ) {
1851                         $context = RequestContext::getMain();
1852                 }
1853
1854                 $editCount = false;
1855                 if ( in_array( 'verify', $options ) ) {
1856                         $editCount = self::getRollbackEditCount( $rev, true );
1857                         if ( $editCount === false ) {
1858                                 return '';
1859                         }
1860                 }
1861
1862                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1863
1864                 if ( !in_array( 'noBrackets', $options ) ) {
1865                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->escaped();
1866                 }
1867
1868                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1869         }
1870
1871         /**
1872          * This function will return the number of revisions which a rollback
1873          * would revert and, if $verify is set it will verify that a revision
1874          * can be reverted (that the user isn't the only contributor and the
1875          * revision we might rollback to isn't deleted). These checks can only
1876          * function as an additional check as this function only checks against
1877          * the last $wgShowRollbackEditCount edits.
1878          *
1879          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1880          * is set and the user is the only contributor of the page.
1881          *
1882          * @param Revision $rev
1883          * @param bool $verify Try to verify that this revision can really be rolled back
1884          * @return int|bool|null
1885          */
1886         public static function getRollbackEditCount( $rev, $verify ) {
1887                 global $wgShowRollbackEditCount;
1888                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1889                         // Nothing has happened, indicate this by returning 'null'
1890                         return null;
1891                 }
1892
1893                 $dbr = wfGetDB( DB_SLAVE );
1894
1895                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1896                 $res = $dbr->select(
1897                         'revision',
1898                         array( 'rev_user_text', 'rev_deleted' ),
1899                         // $rev->getPage() returns null sometimes
1900                         array( 'rev_page' => $rev->getTitle()->getArticleID() ),
1901                         __METHOD__,
1902                         array(
1903                                 'USE INDEX' => array( 'revision' => 'page_timestamp' ),
1904                                 'ORDER BY' => 'rev_timestamp DESC',
1905                                 'LIMIT' => $wgShowRollbackEditCount + 1
1906                         )
1907                 );
1908
1909                 $editCount = 0;
1910                 $moreRevs = false;
1911                 foreach ( $res as $row ) {
1912                         if ( $rev->getUserText( Revision::RAW ) != $row->rev_user_text ) {
1913                                 if ( $verify &&
1914                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1915                                                 || $row->rev_deleted & Revision::DELETED_USER
1916                                 ) ) {
1917                                         // If the user or the text of the revision we might rollback
1918                                         // to is deleted in some way we can't rollback. Similar to
1919                                         // the sanity checks in WikiPage::commitRollback.
1920                                         return false;
1921                                 }
1922                                 $moreRevs = true;
1923                                 break;
1924                         }
1925                         $editCount++;
1926                 }
1927
1928                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1929                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1930                         // and there weren't any other revisions. That means that the current user is the only
1931                         // editor, so we can't rollback
1932                         return false;
1933                 }
1934                 return $editCount;
1935         }
1936
1937         /**
1938          * Build a raw rollback link, useful for collections of "tool" links
1939          *
1940          * @param Revision $rev
1941          * @param IContextSource|null $context Context to use or null for the main context.
1942          * @param int $editCount Number of edits that would be reverted
1943          * @return string HTML fragment
1944          */
1945         public static function buildRollbackLink( $rev, IContextSource $context = null,
1946                 $editCount = false
1947         ) {
1948                 global $wgShowRollbackEditCount, $wgMiserMode;
1949
1950                 // To config which pages are affected by miser mode
1951                 $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );
1952
1953                 if ( $context === null ) {
1954                         $context = RequestContext::getMain();
1955                 }
1956
1957                 $title = $rev->getTitle();
1958                 $query = array(
1959                         'action' => 'rollback',
1960                         'from' => $rev->getUserText(),
1961                         'token' => $context->getUser()->getEditToken( array(
1962                                 $title->getPrefixedText(),
1963                                 $rev->getUserText()
1964                         ) ),
1965                 );
1966                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1967                         $query['bot'] = '1';
1968                         $query['hidediff'] = '1'; // bug 15999
1969                 }
1970
1971                 $disableRollbackEditCount = false;
1972                 if ( $wgMiserMode ) {
1973                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1974                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1975                                         $disableRollbackEditCount = true;
1976                                         break;
1977                                 }
1978                         }
1979                 }
1980
1981                 if ( !$disableRollbackEditCount
1982                         && is_int( $wgShowRollbackEditCount )
1983                         && $wgShowRollbackEditCount > 0
1984                 ) {
1985                         if ( !is_numeric( $editCount ) ) {
1986                                 $editCount = self::getRollbackEditCount( $rev, false );
1987                         }
1988
1989                         if ( $editCount > $wgShowRollbackEditCount ) {
1990                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
1991                                         ->numParams( $wgShowRollbackEditCount )->parse();
1992                         } else {
1993                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1994                         }
1995
1996                         return self::link(
1997                                 $title,
1998                                 $editCount_output,
1999                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
2000                                 $query,
2001                                 array( 'known', 'noclasses' )
2002                         );
2003                 } else {
2004                         return self::link(
2005                                 $title,
2006                                 $context->msg( 'rollbacklink' )->escaped(),
2007                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
2008                                 $query,
2009                                 array( 'known', 'noclasses' )
2010                         );
2011                 }
2012         }
2013
2014         /**
2015          * Returns HTML for the "templates used on this page" list.
2016          *
2017          * Make an HTML list of templates, and then add a "More..." link at
2018          * the bottom. If $more is null, do not add a "More..." link. If $more
2019          * is a Title, make a link to that title and use it. If $more is a string,
2020          * directly paste it in as the link (escaping needs to be done manually).
2021          * Finally, if $more is a Message, call toString().
2022          *
2023          * @param array $templates Array of templates from Article::getUsedTemplate or similar
2024          * @param bool $preview Whether this is for a preview
2025          * @param bool $section Whether this is for a section edit
2026          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
2027          * @return string HTML output
2028          */
2029         public static function formatTemplates( $templates, $preview = false,
2030                 $section = false, $more = null
2031         ) {
2032                 global $wgLang;
2033
2034                 $outText = '';
2035                 if ( count( $templates ) > 0 ) {
2036                         # Do a batch existence check
2037                         $batch = new LinkBatch;
2038                         foreach ( $templates as $title ) {
2039                                 $batch->addObj( $title );
2040                         }
2041                         $batch->execute();
2042
2043                         # Construct the HTML
2044                         $outText = '<div class="mw-templatesUsedExplanation">';
2045                         if ( $preview ) {
2046                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
2047                                         ->parseAsBlock();
2048                         } elseif ( $section ) {
2049                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
2050                                         ->parseAsBlock();
2051                         } else {
2052                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
2053                                         ->parseAsBlock();
2054                         }
2055                         $outText .= "</div><ul>\n";
2056
2057                         usort( $templates, 'Title::compare' );
2058                         foreach ( $templates as $titleObj ) {
2059                                 $protected = '';
2060                                 $restrictions = $titleObj->getRestrictions( 'edit' );
2061                                 if ( $restrictions ) {
2062                                         // Check backwards-compatible messages
2063                                         $msg = null;
2064                                         if ( $restrictions === array( 'sysop' ) ) {
2065                                                 $msg = wfMessage( 'template-protected' );
2066                                         } elseif ( $restrictions === array( 'autoconfirmed' ) ) {
2067                                                 $msg = wfMessage( 'template-semiprotected' );
2068                                         }
2069                                         if ( $msg && !$msg->isDisabled() ) {
2070                                                 $protected = $msg->parse();
2071                                         } else {
2072                                                 // Construct the message from restriction-level-*
2073                                                 // e.g. restriction-level-sysop, restriction-level-autoconfirmed
2074                                                 $msgs = array();
2075                                                 foreach ( $restrictions as $r ) {
2076                                                         $msgs[] = wfMessage( "restriction-level-$r" )->parse();
2077                                                 }
2078                                                 $protected = wfMessage( 'parentheses' )
2079                                                         ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
2080                                         }
2081                                 }
2082                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
2083                                         $editLink = self::link(
2084                                                 $titleObj,
2085                                                 wfMessage( 'editlink' )->escaped(),
2086                                                 array(),
2087                                                 array( 'action' => 'edit' )
2088                                         );
2089                                 } else {
2090                                         $editLink = self::link(
2091                                                 $titleObj,
2092                                                 wfMessage( 'viewsourcelink' )->escaped(),
2093                                                 array(),
2094                                                 array( 'action' => 'edit' )
2095                                         );
2096                                 }
2097                                 $outText .= '<li>' . self::link( $titleObj )
2098                                         . wfMessage( 'word-separator' )->escaped()
2099                                         . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
2100                                         . wfMessage( 'word-separator' )->escaped()
2101                                         . $protected . '</li>';
2102                         }
2103
2104                         if ( $more instanceof Title ) {
2105                                 $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
2106                         } elseif ( $more ) {
2107                                 $outText .= "<li>$more</li>";
2108                         }
2109
2110                         $outText .= '</ul>';
2111                 }
2112                 return $outText;
2113         }
2114
2115         /**
2116          * Returns HTML for the "hidden categories on this page" list.
2117          *
2118          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
2119          *   or similar
2120          * @return string HTML output
2121          */
2122         public static function formatHiddenCategories( $hiddencats ) {
2123
2124                 $outText = '';
2125                 if ( count( $hiddencats ) > 0 ) {
2126                         # Construct the HTML
2127                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
2128                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
2129                         $outText .= "</div><ul>\n";
2130
2131                         foreach ( $hiddencats as $titleObj ) {
2132                                 # If it's hidden, it must exist - no need to check with a LinkBatch
2133                                 $outText .= '<li>'
2134                                         . self::link( $titleObj, null, array(), array(), 'known' )
2135                                         . "</li>\n";
2136                         }
2137                         $outText .= '</ul>';
2138                 }
2139                 return $outText;
2140         }
2141
2142         /**
2143          * Format a size in bytes for output, using an appropriate
2144          * unit (B, KB, MB or GB) according to the magnitude in question
2145          *
2146          * @param int $size Size to format
2147          * @return string
2148          */
2149         public static function formatSize( $size ) {
2150                 global $wgLang;
2151                 return htmlspecialchars( $wgLang->formatSize( $size ) );
2152         }
2153
2154         /**
2155          * Given the id of an interface element, constructs the appropriate title
2156          * attribute from the system messages.  (Note, this is usually the id but
2157          * isn't always, because sometimes the accesskey needs to go on a different
2158          * element than the id, for reverse-compatibility, etc.)
2159          *
2160          * @param string $name Id of the element, minus prefixes.
2161          * @param string|null $options Null or the string 'withaccess' to add an access-
2162          *   key hint
2163          * @return string Contents of the title attribute (which you must HTML-
2164          *   escape), or false for no title attribute
2165          */
2166         public static function titleAttrib( $name, $options = null ) {
2167
2168                 $message = wfMessage( "tooltip-$name" );
2169
2170                 if ( !$message->exists() ) {
2171                         $tooltip = false;
2172                 } else {
2173                         $tooltip = $message->text();
2174                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2175                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2176                         # Message equal to '-' means suppress it.
2177                         if ( $tooltip == '-' ) {
2178                                 $tooltip = false;
2179                         }
2180                 }
2181
2182                 if ( $options == 'withaccess' ) {
2183                         $accesskey = self::accesskey( $name );
2184                         if ( $accesskey !== false ) {
2185                                 // Should be build the same as in jquery.accessKeyLabel.js
2186                                 if ( $tooltip === false || $tooltip === '' ) {
2187                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2188                                 } else {
2189                                         $tooltip .= wfMessage( 'word-separator' )->text();
2190                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2191                                 }
2192                         }
2193                 }
2194
2195                 return $tooltip;
2196         }
2197
2198         public static $accesskeycache;
2199
2200         /**
2201          * Given the id of an interface element, constructs the appropriate
2202          * accesskey attribute from the system messages.  (Note, this is usually
2203          * the id but isn't always, because sometimes the accesskey needs to go on
2204          * a different element than the id, for reverse-compatibility, etc.)
2205          *
2206          * @param string $name Id of the element, minus prefixes.
2207          * @return string Contents of the accesskey attribute (which you must HTML-
2208          *   escape), or false for no accesskey attribute
2209          */
2210         public static function accesskey( $name ) {
2211                 if ( isset( self::$accesskeycache[$name] ) ) {
2212                         return self::$accesskeycache[$name];
2213                 }
2214
2215                 $message = wfMessage( "accesskey-$name" );
2216
2217                 if ( !$message->exists() ) {
2218                         $accesskey = false;
2219                 } else {
2220                         $accesskey = $message->plain();
2221                         if ( $accesskey === '' || $accesskey === '-' ) {
2222                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2223                                 # attribute, but this is broken for accesskey: that might be a useful
2224                                 # value.
2225                                 $accesskey = false;
2226                         }
2227                 }
2228
2229                 self::$accesskeycache[$name] = $accesskey;
2230                 return self::$accesskeycache[$name];
2231         }
2232
2233         /**
2234          * Get a revision-deletion link, or disabled link, or nothing, depending
2235          * on user permissions & the settings on the revision.
2236          *
2237          * Will use forward-compatible revision ID in the Special:RevDelete link
2238          * if possible, otherwise the timestamp-based ID which may break after
2239          * undeletion.
2240          *
2241          * @param User $user
2242          * @param Revision $rev
2243          * @param Title $title
2244          * @return string HTML fragment
2245          */
2246         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2247                 $canHide = $user->isAllowed( 'deleterevision' );
2248                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2249                         return '';
2250                 }
2251
2252                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2253                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2254                 } else {
2255                         if ( $rev->getId() ) {
2256                                 // RevDelete links using revision ID are stable across
2257                                 // page deletion and undeletion; use when possible.
2258                                 $query = array(
2259                                         'type' => 'revision',
2260                                         'target' => $title->getPrefixedDBkey(),
2261                                         'ids' => $rev->getId()
2262                                 );
2263                         } else {
2264                                 // Older deleted entries didn't save a revision ID.
2265                                 // We have to refer to these by timestamp, ick!
2266                                 $query = array(
2267                                         'type' => 'archive',
2268                                         'target' => $title->getPrefixedDBkey(),
2269                                         'ids' => $rev->getTimestamp()
2270                                 );
2271                         }
2272                         return Linker::revDeleteLink( $query,
2273                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2274                 }
2275         }
2276
2277         /**
2278          * Creates a (show/hide) link for deleting revisions/log entries
2279          *
2280          * @param array $query Query parameters to be passed to link()
2281          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2282          * @param bool $delete Set to true to use (show/hide) rather than (show)
2283          *
2284          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2285          * span to allow for customization of appearance with CSS
2286          */
2287         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
2288                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2289                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2290                 $html = wfMessage( $msgKey )->escaped();
2291                 $tag = $restricted ? 'strong' : 'span';
2292                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
2293                 return Xml::tags(
2294                         $tag,
2295                         array( 'class' => 'mw-revdelundel-link' ),
2296                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2297                 );
2298         }
2299
2300         /**
2301          * Creates a dead (show/hide) link for deleting revisions/log entries
2302          *
2303          * @param bool $delete Set to true to use (show/hide) rather than (show)
2304          *
2305          * @return string HTML text wrapped in a span to allow for customization
2306          * of appearance with CSS
2307          */
2308         public static function revDeleteLinkDisabled( $delete = true ) {
2309                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2310                 $html = wfMessage( $msgKey )->escaped();
2311                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2312                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
2313         }
2314
2315         /* Deprecated methods */
2316
2317         /**
2318          * @deprecated since 1.16 Use link(); warnings since 1.21
2319          *
2320          * Make a link for a title which may or may not be in the database. If you need to
2321          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
2322          * call to this will result in a DB query.
2323          *
2324          * @param Title $nt The title object to make the link from, e.g. from Title::newFromText.
2325          * @param string $text Link text
2326          * @param string $query Optional query part
2327          * @param string $trail Optional trail. Alphabetic characters at the start of this string will
2328          *   be included in the link text. Other characters will be appended after
2329          *   the end of the link.
2330          * @param string $prefix Optional prefix. As trail, only before instead of after.
2331          * @return string
2332          */
2333         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2334                 wfDeprecated( __METHOD__, '1.21' );
2335
2336                 $query = wfCgiToArray( $query );
2337                 list( $inside, $trail ) = self::splitTrail( $trail );
2338                 if ( $text === '' ) {
2339                         $text = self::linkText( $nt );
2340                 }
2341
2342                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
2343
2344                 return $ret;
2345         }
2346
2347         /**
2348          * @deprecated since 1.16 Use link(); warnings since 1.21
2349          *
2350          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
2351          * it doesn't have to do a database query. It's also valid for interwiki titles and special
2352          * pages.
2353          *
2354          * @param Title $title Title object of target page
2355          * @param string $text Text to replace the title
2356          * @param string $query Link target
2357          * @param string $trail Text after link
2358          * @param string $prefix Text before link text
2359          * @param string $aprops Extra attributes to the a-element
2360          * @param string $style Style to apply - if empty, use getInternalLinkAttributesObj instead
2361          * @return string The a-element
2362          */
2363         static function makeKnownLinkObj(
2364                 $title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
2365         ) {
2366                 wfDeprecated( __METHOD__, '1.21' );
2367
2368                 if ( $text == '' ) {
2369                         $text = self::linkText( $title );
2370                 }
2371                 $attribs = Sanitizer::mergeAttributes(
2372                         Sanitizer::decodeTagAttributes( $aprops ),
2373                         Sanitizer::decodeTagAttributes( $style )
2374                 );
2375                 $query = wfCgiToArray( $query );
2376                 list( $inside, $trail ) = self::splitTrail( $trail );
2377
2378                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
2379                         array( 'known', 'noclasses' ) ) . $trail;
2380
2381                 return $ret;
2382         }
2383
2384         /**
2385          * Returns the attributes for the tooltip and access key.
2386          * @param string $name
2387          * @return array
2388          */
2389         public static function tooltipAndAccesskeyAttribs( $name ) {
2390                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2391                 # no attribute" instead of "output '' as value for attribute", this
2392                 # would be three lines.
2393                 $attribs = array(
2394                         'title' => self::titleAttrib( $name, 'withaccess' ),
2395                         'accesskey' => self::accesskey( $name )
2396                 );
2397                 if ( $attribs['title'] === false ) {
2398                         unset( $attribs['title'] );
2399                 }
2400                 if ( $attribs['accesskey'] === false ) {
2401                         unset( $attribs['accesskey'] );
2402                 }
2403                 return $attribs;
2404         }
2405
2406         /**
2407          * Returns raw bits of HTML, use titleAttrib()
2408          * @param string $name
2409          * @param array|null $options
2410          * @return null|string
2411          */
2412         public static function tooltip( $name, $options = null ) {
2413                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2414                 # no attribute" instead of "output '' as value for attribute", this
2415                 # would be two lines.
2416                 $tooltip = self::titleAttrib( $name, $options );
2417                 if ( $tooltip === false ) {
2418                         return '';
2419                 }
2420                 return Xml::expandAttributes( array(
2421                         'title' => $tooltip
2422                 ) );
2423         }
2424
2425 }
2426
2427 /**
2428  * @since 1.18
2429  */
2430 class DummyLinker {
2431
2432         /**
2433          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2434          * into static calls to the new Linker for backwards compatibility.
2435          *
2436          * @param string $fname Name of called method
2437          * @param array $args Arguments to the method
2438          * @return mixed
2439          */
2440         public function __call( $fname, $args ) {
2441                 return call_user_func_array( array( 'Linker', $fname ), $args );
2442         }
2443 }