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  * @ingroup Skins
  29  */
  30 class Linker {
  31
  32         /**
  33          * Flags for userToolLinks()
  34          */
  35         const TOOL_LINKS_NOBLOCK = 1;
  36         const TOOL_LINKS_EMAIL   = 2;
  37
  38         /**
  39          * Get the appropriate HTML attributes to add to the "a" element of an ex-
  40          * ternal link, as created by [wikisyntax].
  41          *
  42          * @param $class String: the contents of the class attribute; if an empty
  43          *   string is passed, which is the default value, defaults to 'external'.
  44          * @return string
  45          * @deprecated since 1.18 Just pass the external class directly to something using Html::expandAttributes
  46          */
  47         static function getExternalLinkAttributes( $class = 'external' ) {
  48                 wfDeprecated( __METHOD__, '1.18' );
  49                 return self::getLinkAttributesInternal( '', $class );
  50         }
  51
  52         /**
  53          * Get the appropriate HTML attributes to add to the "a" element of an in-
  54          * terwiki link.
  55          *
  56          * @param $title String: the title text for the link, URL-encoded (???) but
  57          *   not HTML-escaped
  58          * @param $unused String: unused
  59          * @param $class String: the contents of the class attribute; if an empty
  60          *   string is passed, which is the default value, defaults to 'external'.
  61          * @return string
  62          */
  63         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  64                 global $wgContLang;
  65
  66                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  67                 # getExternalLinkAttributes, why?
  68                 $title = urldecode( $title );
  69                 $title = $wgContLang->checkTitleEncoding( $title );
  70                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  71
  72                 return self::getLinkAttributesInternal( $title, $class );
  73         }
  74
  75         /**
  76          * Get the appropriate HTML attributes to add to the "a" element of an in-
  77          * ternal link.
  78          *
  79          * @param $title String: the title text for the link, URL-encoded (???) but
  80          *   not HTML-escaped
  81          * @param $unused String: unused
  82          * @param $class String: the contents of the class attribute, default none
  83          * @return string
  84          */
  85         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  86                 $title = urldecode( $title );
  87                 $title = str_replace( '_', ' ', $title );
  88                 return self::getLinkAttributesInternal( $title, $class );
  89         }
  90
  91         /**
  92          * Get the appropriate HTML attributes to add to the "a" element of an in-
  93          * ternal link, given the Title object for the page we want to link to.
  94          *
  95          * @param $nt Title
  96          * @param $unused String: unused
  97          * @param $class String: the contents of the class attribute, default none
  98          * @param $title Mixed: optional (unescaped) string to use in the title
  99          *   attribute; if false, default to the name of the page we're linking to
 100          * @return string
 101          */
 102         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
 103                 if ( $title === false ) {
 104                         $title = $nt->getPrefixedText();
 105                 }
 106                 return self::getLinkAttributesInternal( $title, $class );
 107         }
 108
 109         /**
 110          * Common code for getLinkAttributesX functions
 111          *
 112          * @param $title string
 113          * @param $class string
 114          *
 115          * @return string
 116          */
 117         private static function getLinkAttributesInternal( $title, $class ) {
 118                 $title = htmlspecialchars( $title );
 119                 $class = htmlspecialchars( $class );
 120                 $r = '';
 121                 if ( $class != '' ) {
 122                         $r .= " class=\"$class\"";
 123                 }
 124                 if ( $title != '' ) {
 125                         $r .= " title=\"$title\"";
 126                 }
 127                 return $r;
 128         }
 129
 130         /**
 131          * Return the CSS colour of a known link
 132          *
 133          * @param $t Title object
 134          * @param $threshold Integer: user defined threshold
 135          * @return String: CSS class
 136          */
 137         public static function getLinkColour( $t, $threshold ) {
 138                 $colour = '';
 139                 if ( $t->isRedirect() ) {
 140                         # Page is a redirect
 141                         $colour = 'mw-redirect';
 142                 } elseif ( $threshold > 0 && $t->isContentPage() &&
 143                         $t->exists() && $t->getLength() < $threshold
 144                 ) {
 145                         # Page is a stub
 146                         $colour = 'stub';
 147                 }
 148                 return $colour;
 149         }
 150
 151         /**
 152          * This function returns an HTML link to the given target.  It serves a few
 153          * purposes:
 154          *   1) If $target is a Title, the correct URL to link to will be figured
 155          *      out automatically.
 156          *   2) It automatically adds the usual classes for various types of link
 157          *      targets: "new" for red links, "stub" for short articles, etc.
 158          *   3) It escapes all attribute values safely so there's no risk of XSS.
 159          *   4) It provides a default tooltip if the target is a Title (the page
 160          *      name of the target).
 161          * link() replaces the old functions in the makeLink() family.
 162          *
 163          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 164          * You can call it using this if you want to keep compat with these:
 165          * $linker = class_exists( 'DummyLinker' ) ? new DummyLinker() : new Linker();
 166          * $linker->link( ... );
 167          *
 168          * @param $target        Title  Can currently only be a Title, but this may
 169          *   change to support Images, literal URLs, etc.
 170          * @param $html          string The HTML contents of the <a> element, i.e.,
 171          *   the link text.  This is raw HTML and will not be escaped.  If null,
 172          *   defaults to the prefixed text of the Title; or if the Title is just a
 173          *   fragment, the contents of the fragment.
 174          * @param $customAttribs array  A key => value array of extra HTML attri-
 175          *   butes, such as title and class.  (href is ignored.)  Classes will be
 176          *   merged with the default classes, while other attributes will replace
 177          *   default attributes.  All passed attribute values will be HTML-escaped.
 178          *   A false attribute value means to suppress that attribute.
 179          * @param $query         array  The query string to append to the URL
 180          *   you're linking to, in key => value array form.  Query keys and values
 181          *   will be URL-encoded.
 182          * @param $options string|array  String or array of strings:
 183          *     'known': Page is known to exist, so don't check if it does.
 184          *     'broken': Page is known not to exist, so don't check if it does.
 185          *     'noclasses': Don't add any classes automatically (includes "new",
 186          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
 187          *       provided, if any, so you get a simple blue link with no funny i-
 188          *       cons.
 189          *     'forcearticlepath': Use the article path always, even with a querystring.
 190          *       Has compatibility issues on some setups, so avoid wherever possible.
 191          *     'http': Force a full URL with http:// as the scheme.
 192          *     'https': Force a full URL with https:// as the scheme.
 193          * @return string HTML <a> attribute
 194          */
 195         public static function link(
 196                 $target, $html = null, $customAttribs = array(), $query = array(), $options = array()
 197         ) {
 198                 wfProfileIn( __METHOD__ );
 199                 if ( !$target instanceof Title ) {
 200                         wfProfileOut( __METHOD__ );
 201                         return "<!-- ERROR -->$html";
 202                 }
 203
 204                 if( is_string( $query ) ) {
 205                         // some functions withing core using this still hand over query strings
 206                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
 207                         $query = wfCgiToArray( $query );
 208                 }
 209                 $options = (array)$options;
 210
 211                 $dummy = new DummyLinker; // dummy linker instance for bc on the hooks
 212
 213                 $ret = null;
 214                 if ( !wfRunHooks( 'LinkBegin', array( $dummy, $target, &$html,
 215                 &$customAttribs, &$query, &$options, &$ret ) ) ) {
 216                         wfProfileOut( __METHOD__ );
 217                         return $ret;
 218                 }
 219
 220                 # Normalize the Title if it's a special page
 221                 $target = self::normaliseSpecialPage( $target );
 222
 223                 # If we don't know whether the page exists, let's find out.
 224                 wfProfileIn( __METHOD__ . '-checkPageExistence' );
 225                 if ( !in_array( 'known', $options ) and !in_array( 'broken', $options ) ) {
 226                         if ( $target->isKnown() ) {
 227                                 $options[] = 'known';
 228                         } else {
 229                                 $options[] = 'broken';
 230                         }
 231                 }
 232                 wfProfileOut( __METHOD__ . '-checkPageExistence' );
 233
 234                 $oldquery = array();
 235                 if ( in_array( "forcearticlepath", $options ) && $query ) {
 236                         $oldquery = $query;
 237                         $query = array();
 238                 }
 239
 240                 # Note: we want the href attribute first, for prettiness.
 241                 $attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
 242                 if ( in_array( 'forcearticlepath', $options ) && $oldquery ) {
 243                         $attribs['href'] = wfAppendQuery( $attribs['href'], wfArrayToCgi( $oldquery ) );
 244                 }
 245
 246                 $attribs = array_merge(
 247                         $attribs,
 248                         self::linkAttribs( $target, $customAttribs, $options )
 249                 );
 250                 if ( is_null( $html ) ) {
 251                         $html = self::linkText( $target );
 252                 }
 253
 254                 $ret = null;
 255                 if ( wfRunHooks( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
 256                         $ret = Html::rawElement( 'a', $attribs, $html );
 257                 }
 258
 259                 wfProfileOut( __METHOD__ );
 260                 return $ret;
 261         }
 262
 263         /**
 264          * Identical to link(), except $options defaults to 'known'.
 265          * @return string
 266          */
 267         public static function linkKnown(
 268                 $target, $html = null, $customAttribs = array(),
 269                 $query = array(), $options = array( 'known', 'noclasses' ) )
 270         {
 271                 return self::link( $target, $html, $customAttribs, $query, $options );
 272         }
 273
 274         /**
 275          * Returns the Url used to link to a Title
 276          *
 277          * @param $target Title
 278          * @param $query Array: query parameters
 279          * @param $options Array
 280          * @return String
 281          */
 282         private static function linkUrl( $target, $query, $options ) {
 283                 wfProfileIn( __METHOD__ );
 284                 # We don't want to include fragments for broken links, because they
 285                 # generally make no sense.
 286                 if ( in_array( 'broken', $options ) && $target->mFragment !== '' ) {
 287                         $target = clone $target;
 288                         $target->mFragment = '';
 289                 }
 290
 291                 # If it's a broken link, add the appropriate query pieces, unless
 292                 # there's already an action specified, or unless 'edit' makes no sense
 293                 # (i.e., for a nonexistent special page).
 294                 if ( in_array( 'broken', $options ) && empty( $query['action'] )
 295                         && !$target->isSpecialPage() ) {
 296                         $query['action'] = 'edit';
 297                         $query['redlink'] = '1';
 298                 }
 299
 300                 if ( in_array( 'http', $options ) ) {
 301                         $proto = PROTO_HTTP;
 302                 } elseif ( in_array( 'https', $options ) ) {
 303                         $proto = PROTO_HTTPS;
 304                 } else {
 305                         $proto = PROTO_RELATIVE;
 306                 }
 307
 308                 $ret = $target->getLinkURL( $query, false, $proto );
 309                 wfProfileOut( __METHOD__ );
 310                 return $ret;
 311         }
 312
 313         /**
 314          * Returns the array of attributes used when linking to the Title $target
 315          *
 316          * @param $target Title
 317          * @param $attribs
 318          * @param $options
 319          *
 320          * @return array
 321          */
 322         private static function linkAttribs( $target, $attribs, $options ) {
 323                 wfProfileIn( __METHOD__ );
 324                 global $wgUser;
 325                 $defaults = array();
 326
 327                 if ( !in_array( 'noclasses', $options ) ) {
 328                         wfProfileIn( __METHOD__ . '-getClasses' );
 329                         # Now build the classes.
 330                         $classes = array();
 331
 332                         if ( in_array( 'broken', $options ) ) {
 333                                 $classes[] = 'new';
 334                         }
 335
 336                         if ( $target->isExternal() ) {
 337                                 $classes[] = 'extiw';
 338                         }
 339
 340                         if ( !in_array( 'broken', $options ) ) { # Avoid useless calls to LinkCache (see r50387)
 341                                 $colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
 342                                 if ( $colour !== '' ) {
 343                                         $classes[] = $colour; # mw-redirect or stub
 344                                 }
 345                         }
 346                         if ( $classes != array() ) {
 347                                 $defaults['class'] = implode( ' ', $classes );
 348                         }
 349                         wfProfileOut( __METHOD__ . '-getClasses' );
 350                 }
 351
 352                 # Get a default title attribute.
 353                 if ( $target->getPrefixedText() == '' ) {
 354                         # A link like [[#Foo]].  This used to mean an empty title
 355                         # attribute, but that's silly.  Just don't output a title.
 356                 } elseif ( in_array( 'known', $options ) ) {
 357                         $defaults['title'] = $target->getPrefixedText();
 358                 } else {
 359                         $defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )->text();
 360                 }
 361
 362                 # Finally, merge the custom attribs with the default ones, and iterate
 363                 # over that, deleting all "false" attributes.
 364                 $ret = array();
 365                 $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
 366                 foreach ( $merged as $key => $val ) {
 367                         # A false value suppresses the attribute, and we don't want the
 368                         # href attribute to be overridden.
 369                         if ( $key != 'href' and $val !== false ) {
 370                                 $ret[$key] = $val;
 371                         }
 372                 }
 373                 wfProfileOut( __METHOD__ );
 374                 return $ret;
 375         }
 376
 377         /**
 378          * Default text of the links to the Title $target
 379          *
 380          * @param $target Title
 381          *
 382          * @return string
 383          */
 384         private static function linkText( $target ) {
 385                 # We might be passed a non-Title by make*LinkObj().  Fail gracefully.
 386                 if ( !$target instanceof Title ) {
 387                         return '';
 388                 }
 389
 390                 # If the target is just a fragment, with no title, we return the frag-
 391                 # ment text.  Otherwise, we return the title text itself.
 392                 if ( $target->getPrefixedText() === '' && $target->getFragment() !== '' ) {
 393                         return htmlspecialchars( $target->getFragment() );
 394                 }
 395                 return htmlspecialchars( $target->getPrefixedText() );
 396         }
 397
 398         /**
 399          * Generate either a normal exists-style link or a stub link, depending
 400          * on the given page size.
 401          *
 402          * @param $size Integer
 403          * @param $nt Title object.
 404          * @param $text String
 405          * @param $query String
 406          * @param $trail String
 407          * @param $prefix String
 408          * @return string HTML of link
 409          * @deprecated since 1.17
 410          */
 411         static function makeSizeLinkObj( $size, $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
 412                 global $wgUser;
 413                 wfDeprecated( __METHOD__, '1.17' );
 414
 415                 $threshold = $wgUser->getStubThreshold();
 416                 $colour = ( $size < $threshold ) ? 'stub' : '';
 417                 // @todo FIXME: Replace deprecated makeColouredLinkObj by link()
 418                 return self::makeColouredLinkObj( $nt, $colour, $text, $query, $trail, $prefix );
 419         }
 420
 421         /**
 422          * Make appropriate markup for a link to the current article. This is currently rendered
 423          * as the bold link text. The calling sequence is the same as the other make*LinkObj static functions,
 424          * despite $query not being used.
 425          *
 426          * @param $nt Title
 427          * @param $html String [optional]
 428          * @param $query String [optional]
 429          * @param $trail String [optional]
 430          * @param $prefix String [optional]
 431          *
 432          *
 433          * @return string
 434          */
 435         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 436                 if ( $html == '' ) {
 437                         $html = htmlspecialchars( $nt->getPrefixedText() );
 438                 }
 439                 list( $inside, $trail ) = self::splitTrail( $trail );
 440                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 441         }
 442
 443         /**
 444          * Get a message saying that an invalid title was encountered.
 445          * This should be called after a method like Title::makeTitleSafe() returned
 446          * a value indicating that the title object is invalid.
 447          *
 448          * @param $context IContextSource context to use to get the messages
 449          * @param $namespace int Namespace number
 450          * @param $title string Text of the title, without the namespace part
 451          * @return string
 452          */
 453         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 454                 global $wgContLang;
 455
 456                 // First we check whether the namespace exists or not.
 457                 if ( MWNamespace::exists( $namespace ) ) {
 458                         if ( $namespace == NS_MAIN ) {
 459                                 $name = $context->msg( 'blanknamespace' )->text();
 460                         } else {
 461                                 $name = $wgContLang->getFormattedNsText( $namespace );
 462                         }
 463                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 464                 } else {
 465                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 466                 }
 467         }
 468
 469         /**
 470          * @param $title Title
 471          * @return Title
 472          */
 473         static function normaliseSpecialPage( Title $title ) {
 474                 if ( $title->isSpecialPage() ) {
 475                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 476                         if ( !$name ) {
 477                                 return $title;
 478                         }
 479                         $ret = SpecialPage::getTitleFor( $name, $subpage );
 480                         $ret->mFragment = $title->getFragment();
 481                         return $ret;
 482                 } else {
 483                         return $title;
 484                 }
 485         }
 486
 487         /**
 488          * Returns the filename part of an url.
 489          * Used as alternative text for external images.
 490          *
 491          * @param $url string
 492          *
 493          * @return string
 494          */
 495         private static function fnamePart( $url ) {
 496                 $basename = strrchr( $url, '/' );
 497                 if ( false === $basename ) {
 498                         $basename = $url;
 499                 } else {
 500                         $basename = substr( $basename, 1 );
 501                 }
 502                 return $basename;
 503         }
 504
 505         /**
 506          * Return the code for images which were added via external links,
 507          * via Parser::maybeMakeExternalImage().
 508          *
 509          * @param $url
 510          * @param $alt
 511          *
 512          * @return string
 513          */
 514         public static function makeExternalImage( $url, $alt = '' ) {
 515                 if ( $alt == '' ) {
 516                         $alt = self::fnamePart( $url );
 517                 }
 518                 $img = '';
 519                 $success = wfRunHooks( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
 520                 if ( !$success ) {
 521                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image with url {$url} and alt text {$alt} to {$img}\n", true );
 522                         return $img;
 523                 }
 524                 return Html::element( 'img',
 525                         array(
 526                                 'src' => $url,
 527                                 'alt' => $alt ) );
 528         }
 529
 530         /**
 531          * Given parameters derived from [[Image:Foo|options...]], generate the
 532          * HTML that that syntax inserts in the page.
 533          *
 534          * @param $parser Parser object
 535          * @param $title Title object of the file (not the currently viewed page)
 536          * @param $file File object, or false if it doesn't exist
 537          * @param $frameParams Array: associative array of parameters external to the media handler.
 538          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 539          *     will often be false.
 540          *          thumbnail       If present, downscale and frame
 541          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 542          *          framed          Shows image in original size in a frame
 543          *          frameless       Downscale but don't frame
 544          *          upright         If present, tweak default sizes for portrait orientation
 545          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 546          *          border          If present, show a border around the image
 547          *          align           Horizontal alignment (left, right, center, none)
 548          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 549          *                          bottom, text-bottom)
 550          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 551          *          class           HTML for image classes. Plain text.
 552          *          caption         HTML for image caption.
 553          *          link-url        URL to link to
 554          *          link-title      Title object to link to
 555          *          link-target     Value for the target attribue, only with link-url
 556          *          no-link         Boolean, suppress description link
 557          *
 558          * @param $handlerParams Array: associative array of media handler parameters, to be passed
 559          *       to transform(). Typical keys are "width" and "page".
 560          * @param $time String: timestamp of the file, set as false for current
 561          * @param $query String: query params for desc url
 562          * @param $widthOption: Used by the parser to remember the user preference thumbnailsize
 563          * @since 1.20
 564          * @return String: HTML for an image, with links, wrappers, etc.
 565          */
 566         public static function makeImageLink( /*Parser*/ $parser, Title $title, $file, $frameParams = array(),
 567                 $handlerParams = array(), $time = false, $query = "", $widthOption = null )
 568         {
 569                 $res = null;
 570                 $dummy = new DummyLinker;
 571                 if ( !wfRunHooks( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
 572                         &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
 573                         return $res;
 574                 }
 575
 576                 if ( $file && !$file->allowInlineDisplay() ) {
 577                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 578                         return self::link( $title );
 579                 }
 580
 581                 // Shortcuts
 582                 $fp =& $frameParams;
 583                 $hp =& $handlerParams;
 584
 585                 // Clean up parameters
 586                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 587                 if ( !isset( $fp['align'] ) ) {
 588                         $fp['align'] = '';
 589                 }
 590                 if ( !isset( $fp['alt'] ) ) {
 591                         $fp['alt'] = '';
 592                 }
 593                 if ( !isset( $fp['title'] ) ) {
 594                         $fp['title'] = '';
 595                 }
 596                 if ( !isset( $fp['class'] ) ) {
 597                         $fp['class'] = '';
 598                 }
 599
 600                 $prefix = $postfix = '';
 601
 602                 if ( 'center' == $fp['align'] ) {
 603                         $prefix  = '<div class="center">';
 604                         $postfix = '</div>';
 605                         $fp['align']   = 'none';
 606                 }
 607                 if ( $file && !isset( $hp['width'] ) ) {
 608                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 609                                 // If its a vector image, and user only specifies height
 610                                 // we don't want it to be limited by its "normal" width.
 611                                 global $wgSVGMaxSize;
 612                                 $hp['width'] = $wgSVGMaxSize;
 613                         } else {
 614                                 $hp['width'] = $file->getWidth( $page );
 615                         }
 616
 617                         if ( isset( $fp['thumbnail'] ) || isset( $fp['framed'] ) || isset( $fp['frameless'] ) || !$hp['width'] ) {
 618                                 global $wgThumbLimits, $wgThumbUpright;
 619                                 if ( !isset( $widthOption ) || !isset( $wgThumbLimits[$widthOption] ) ) {
 620                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 621                                 }
 622
 623                                 // Reduce width for upright images when parameter 'upright' is used
 624                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 625                                         $fp['upright'] = $wgThumbUpright;
 626                                 }
 627                                 // For caching health: If width scaled down due to upright parameter, round to full __0 pixel to avoid the creation of a lot of odd thumbs
 628                                 $prefWidth = isset( $fp['upright'] ) ?
 629                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 630                                         $wgThumbLimits[$widthOption];
 631
 632                                 // Use width which is smaller: real image width or user preference width
 633                                 // Unless image is scalable vector.
 634                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 635                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 636                                         $hp['width'] = $prefWidth;
 637                                 }
 638                         }
 639                 }
 640
 641                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 642                         # Create a thumbnail. Alignment depends on the writing direction of
 643                         # the page content language (right-aligned for LTR languages,
 644                         # left-aligned for RTL languages)
 645                         #
 646                         # If a thumbnail width has not been provided, it is set
 647                         # to the default user option as specified in Language*.php
 648                         if ( $fp['align'] == '' ) {
 649                                 if( $parser instanceof Parser ) {
 650                                         $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 651                                 } else {
 652                                         # backwards compatibility, remove with makeImageLink2()
 653                                         global $wgContLang;
 654                                         $fp['align'] = $wgContLang->alignEnd();
 655                                 }
 656                         }
 657                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 658                 }
 659
 660                 if ( $file && isset( $fp['frameless'] ) ) {
 661                         $srcWidth = $file->getWidth( $page );
 662                         # For "frameless" option: do not present an image bigger than the source (for bitmap-style images)
 663                         # This is the same behaviour as the "thumb" option does it already.
 664                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 665                                 $hp['width'] = $srcWidth;
 666                         }
 667                 }
 668
 669                 if ( $file && isset( $hp['width'] ) ) {
 670                         # Create a resized image, without the additional thumbnail features
 671                         $thumb = $file->transform( $hp );
 672                 } else {
 673                         $thumb = false;
 674                 }
 675
 676                 if ( !$thumb ) {
 677                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 678                 } else {
 679                         self::processResponsiveImages( $file, $thumb, $hp );
 680                         $params = array(
 681                                 'alt' => $fp['alt'],
 682                                 'title' => $fp['title'],
 683                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 684                                 'img-class' => $fp['class'] );
 685                         if ( isset( $fp['border'] ) ) {
 686                                 $params['img-class'] .= ( $params['img-class'] !== '' ) ? ' thumbborder' : 'thumbborder';
 687                         }
 688                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 689
 690                         $s = $thumb->toHtml( $params );
 691                 }
 692                 if ( $fp['align'] != '' ) {
 693                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 694                 }
 695                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 696         }
 697
 698         /**
 699          * See makeImageLink()
 700          * When this function is removed, remove if( $parser instanceof Parser ) check there too
 701          * @deprecated since 1.20
 702          */
 703         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 704                 $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
 705                 return self::makeImageLink( null, $title, $file, $frameParams,
 706                         $handlerParams, $time, $query, $widthOption );
 707         }
 708
 709         /**
 710          * Get the link parameters for MediaTransformOutput::toHtml() from given
 711          * frame parameters supplied by the Parser.
 712          * @param $frameParams array The frame parameters
 713          * @param $query string An optional query string to add to description page links
 714          * @return array
 715          */
 716         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 717                 $mtoParams = array();
 718                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 719                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 720                         if ( isset( $frameParams['link-target'] ) ) {
 721                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 722                         }
 723                         if ( $parser ) {
 724                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 725                                 foreach ( $extLinkAttrs as $name => $val ) {
 726                                         // Currently could include 'rel' and 'target'
 727                                         $mtoParams['parser-extlink-'.$name] = $val;
 728                                 }
 729                         }
 730                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 731                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 732                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 733                         // No link
 734                 } else {
 735                         $mtoParams['desc-link'] = true;
 736                         $mtoParams['desc-query'] = $query;
 737                 }
 738                 return $mtoParams;
 739         }
 740
 741         /**
 742          * Make HTML for a thumbnail including image, border and caption
 743          * @param $title Title object
 744          * @param $file File object or false if it doesn't exist
 745          * @param $label String
 746          * @param $alt String
 747          * @param $align String
 748          * @param $params Array
 749          * @param $framed Boolean
 750          * @param $manualthumb String
 751          * @return mixed
 752          */
 753         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 754                 $align = 'right', $params = array(), $framed = false , $manualthumb = "" )
 755         {
 756                 $frameParams = array(
 757                         'alt' => $alt,
 758                         'caption' => $label,
 759                         'align' => $align
 760                 );
 761                 if ( $framed ) {
 762                         $frameParams['framed'] = true;
 763                 }
 764                 if ( $manualthumb ) {
 765                         $frameParams['manualthumb'] = $manualthumb;
 766                 }
 767                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 768         }
 769
 770         /**
 771          * @param $title Title
 772          * @param  $file File
 773          * @param array $frameParams
 774          * @param array $handlerParams
 775          * @param bool $time
 776          * @param string $query
 777          * @return mixed
 778          */
 779         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 780                 $handlerParams = array(), $time = false, $query = "" )
 781         {
 782                 global $wgStylePath, $wgContLang;
 783                 $exists = $file && $file->exists();
 784
 785                 # Shortcuts
 786                 $fp =& $frameParams;
 787                 $hp =& $handlerParams;
 788
 789                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 790                 if ( !isset( $fp['align'] ) ) $fp['align'] = 'right';
 791                 if ( !isset( $fp['alt'] ) ) $fp['alt'] = '';
 792                 if ( !isset( $fp['title'] ) ) $fp['title'] = '';
 793                 if ( !isset( $fp['caption'] ) ) $fp['caption'] = '';
 794
 795                 if ( empty( $hp['width'] ) ) {
 796                         // Reduce width for upright images when parameter 'upright' is used
 797                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 798                 }
 799                 $thumb = false;
 800                 $noscale = false;
 801
 802                 if ( !$exists ) {
 803                         $outerWidth = $hp['width'] + 2;
 804                 } else {
 805                         if ( isset( $fp['manualthumb'] ) ) {
 806                                 # Use manually specified thumbnail
 807                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 808                                 if ( $manual_title ) {
 809                                         $manual_img = wfFindFile( $manual_title );
 810                                         if ( $manual_img ) {
 811                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 812                                         } else {
 813                                                 $exists = false;
 814                                         }
 815                                 }
 816                         } elseif ( isset( $fp['framed'] ) ) {
 817                                 // Use image dimensions, don't scale
 818                                 $thumb = $file->getUnscaledThumb( $hp );
 819                                 $noscale = true;
 820                         } else {
 821                                 # Do not present an image bigger than the source, for bitmap-style images
 822                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behaviour
 823                                 $srcWidth = $file->getWidth( $page );
 824                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 825                                         $hp['width'] = $srcWidth;
 826                                 }
 827                                 $thumb = $file->transform( $hp );
 828                         }
 829
 830                         if ( $thumb ) {
 831                                 $outerWidth = $thumb->getWidth() + 2;
 832                         } else {
 833                                 $outerWidth = $hp['width'] + 2;
 834                         }
 835                 }
 836
 837                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 838                 # So we don't need to pass it here in $query. However, the URL for the
 839                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 840                 $url = $title->getLocalURL( $query );
 841                 if ( $page ) {
 842                         $url = wfAppendQuery( $url, 'page=' . urlencode( $page ) );
 843                 }
 844
 845                 $s = "<div class=\"thumb t{$fp['align']}\"><div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 846                 if ( !$exists ) {
 847                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 848                         $zoomIcon = '';
 849                 } elseif ( !$thumb ) {
 850                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 851                         $zoomIcon = '';
 852                 } else {
 853                         if ( !$noscale ) {
 854                                 self::processResponsiveImages( $file, $thumb, $hp );
 855                         }
 856                         $params = array(
 857                                 'alt' => $fp['alt'],
 858                                 'title' => $fp['title'],
 859                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== '' ) ? $fp['class'] . ' thumbimage' : 'thumbimage'
 860                         );
 861                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 862                         $s .= $thumb->toHtml( $params );
 863                         if ( isset( $fp['framed'] ) ) {
 864                                 $zoomIcon = "";
 865                         } else {
 866                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 867                                         Html::rawElement( 'a', array(
 868                                                 'href' => $url,
 869                                                 'class' => 'internal',
 870                                                 'title' => wfMessage( 'thumbnail-more' )->text() ),
 871                                                 Html::element( 'img', array(
 872                                                         'src' => $wgStylePath . '/common/images/magnify-clip' . ( $wgContLang->isRTL() ? '-rtl' : '' ) . '.png',
 873                                                         'width' => 15,
 874                                                         'height' => 11,
 875                                                         'alt' => "" ) ) ) );
 876                         }
 877                 }
 878                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 879                 return str_replace( "\n", ' ', $s );
 880         }
 881
 882         /**
 883          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 884          * applicable.
 885          *
 886          * @param File $file
 887          * @param MediaOutput $thumb
 888          * @param array $hp image parameters
 889          */
 890         protected static function processResponsiveImages( $file, $thumb, $hp ) {
 891                 global $wgResponsiveImages;
 892                 if ( $wgResponsiveImages ) {
 893                         $hp15 = $hp;
 894                         $hp15['width'] = round( $hp['width'] * 1.5 );
 895                         $hp20 = $hp;
 896                         $hp20['width'] = $hp['width'] * 2;
 897                         if ( isset( $hp['height'] ) ) {
 898                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 899                                 $hp20['height'] = $hp['height'] * 2;
 900                         }
 901
 902                         $thumb15 = $file->transform( $hp15 );
 903                         $thumb20 = $file->transform( $hp20 );
 904                         if ( $thumb15->url !== $thumb->url ) {
 905                                 $thumb->responsiveUrls['1.5'] = $thumb15->url;
 906                         }
 907                         if ( $thumb20->url !== $thumb->url ) {
 908                                 $thumb->responsiveUrls['2'] = $thumb20->url;
 909                         }
 910                 }
 911         }
 912
 913         /**
 914          * Make a "broken" link to an image
 915          *
 916          * @param $title Title object
 917          * @param $label String: link label (plain text)
 918          * @param $query String: query string
 919          * @param $unused1 Unused parameter kept for b/c
 920          * @param $unused2 Unused parameter kept for b/c
 921          * @param $time Boolean: a file of a certain timestamp was requested
 922          * @return String
 923          */
 924         public static function makeBrokenImageLinkObj( $title, $label = '', $query = '', $unused1 = '', $unused2 = '', $time = false ) {
 925                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 926                 if ( ! $title instanceof Title ) {
 927                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 928                 }
 929                 wfProfileIn( __METHOD__ );
 930                 if ( $label == '' ) {
 931                         $label = $title->getPrefixedText();
 932                 }
 933                 $encLabel = htmlspecialchars( $label );
 934                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 935
 936                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads ) && !$currentExists ) {
 937                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 938
 939                         if ( $redir ) {
 940                                 wfProfileOut( __METHOD__ );
 941                                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 942                         }
 943
 944                         $href = self::getUploadUrl( $title, $query );
 945
 946                         wfProfileOut( __METHOD__ );
 947                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 948                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 949                                 $encLabel . '</a>';
 950                 } else {
 951                         wfProfileOut( __METHOD__ );
 952                         return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 953                 }
 954         }
 955
 956         /**
 957          * Get the URL to upload a certain file
 958          *
 959          * @param $destFile Title object of the file to upload
 960          * @param $query String: urlencoded query string to prepend
 961          * @return String: urlencoded URL
 962          */
 963         protected static function getUploadUrl( $destFile, $query = '' ) {
 964                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 965                 $q = 'wpDestFile=' . $destFile->getPartialUrl();
 966                 if ( $query != '' )
 967                         $q .= '&' . $query;
 968
 969                 if ( $wgUploadMissingFileUrl ) {
 970                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 971                 } elseif( $wgUploadNavigationUrl ) {
 972                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 973                 } else {
 974                         $upload = SpecialPage::getTitleFor( 'Upload' );
 975                         return $upload->getLocalUrl( $q );
 976                 }
 977         }
 978
 979         /**
 980          * Create a direct link to a given uploaded file.
 981          *
 982          * @param $title Title object.
 983          * @param $html String: pre-sanitized HTML
 984          * @param $time string: MW timestamp of file creation time
 985          * @return String: HTML
 986          */
 987         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 988                 $img = wfFindFile( $title, array( 'time' => $time ) );
 989                 return self::makeMediaLinkFile( $title, $img, $html );
 990         }
 991
 992         /**
 993          * Create a direct link to a given uploaded file.
 994          * This will make a broken link if $file is false.
 995          *
 996          * @param $title Title object.
 997          * @param $file File|bool mixed File object or false
 998          * @param $html String: pre-sanitized HTML
 999          * @return String: HTML
1000          *
1001          * @todo Handle invalid or missing images better.
1002          */
1003         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
1004                 if ( $file && $file->exists() ) {
1005                         $url = $file->getURL();
1006                         $class = 'internal';
1007                 } else {
1008                         $url = self::getUploadUrl( $title );
1009                         $class = 'new';
1010                 }
1011                 $alt = htmlspecialchars( $title->getText(), ENT_QUOTES );
1012                 if ( $html == '' ) {
1013                         $html = $alt;
1014                 }
1015                 $u = htmlspecialchars( $url );
1016                 return "<a href=\"{$u}\" class=\"$class\" title=\"{$alt}\">{$html}</a>";
1017         }
1018
1019         /**
1020          * Make a link to a special page given its name and, optionally,
1021          * a message key from the link text.
1022          * Usage example: Linker::specialLink( 'Recentchanges' )
1023          *
1024          * @return string
1025          */
1026         public static function specialLink( $name, $key = '' ) {
1027                 if ( $key == '' ) {
1028                         $key = strtolower( $name );
1029                 }
1030
1031                 return self::linkKnown( SpecialPage::getTitleFor( $name ) , wfMessage( $key )->text() );
1032         }
1033
1034         /**
1035          * Make an external link
1036          * @param $url String: URL to link to
1037          * @param $text String: text of link
1038          * @param $escape Boolean: do we escape the link text?
1039          * @param $linktype String: type of external link. Gets added to the classes
1040          * @param $attribs Array of extra attributes to <a>
1041          * @return string
1042          */
1043         public static function makeExternalLink( $url, $text, $escape = true, $linktype = '', $attribs = array() ) {
1044                 $class = "external";
1045                 if ( $linktype ) {
1046                         $class .= " $linktype";
1047                 }
1048                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1049                         $class .= " {$attribs['class']}";
1050                 }
1051                 $attribs['class'] = $class;
1052
1053                 if ( $escape ) {
1054                         $text = htmlspecialchars( $text );
1055                 }
1056                 $link = '';
1057                 $success = wfRunHooks( 'LinkerMakeExternalLink',
1058                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
1059                 if ( !$success ) {
1060                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link with url {$url} and text {$text} to {$link}\n", true );
1061                         return $link;
1062                 }
1063                 $attribs['href'] = $url;
1064                 return Html::rawElement( 'a', $attribs, $text );
1065         }
1066
1067         /**
1068          * Make user link (or user contributions for unregistered users)
1069          * @param $userId   Integer: user id in database.
1070          * @param $userName String: user name in database.
1071          * @param $altUserName String: text to display instead of the user name (optional)
1072          * @return String: HTML fragment
1073          * @since 1.19 Method exists for a long time. $altUserName was added in 1.19.
1074          */
1075         public static function userLink( $userId, $userName, $altUserName = false ) {
1076                 if ( $userId == 0 ) {
1077                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1078                 } else {
1079                         $page = Title::makeTitle( NS_USER, $userName );
1080                 }
1081
1082                 return self::link(
1083                         $page,
1084                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1085                         array( 'class' => 'mw-userlink' )
1086                 );
1087         }
1088
1089         /**
1090          * Generate standard user tool links (talk, contributions, block link, etc.)
1091          *
1092          * @param $userId Integer: user identifier
1093          * @param $userText String: user name or IP address
1094          * @param $redContribsWhenNoEdits Boolean: should the contributions link be
1095          *        red if the user has no edits?
1096          * @param $flags Integer: customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK and Linker::TOOL_LINKS_EMAIL)
1097          * @param $edits Integer: user edit count (optional, for performance)
1098          * @return String: HTML fragment
1099          */
1100         public static function userToolLinks(
1101                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1102         ) {
1103                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1104                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1105                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1106                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1107
1108                 $items = array();
1109                 if ( $talkable ) {
1110                         $items[] = self::userTalkLink( $userId, $userText );
1111                 }
1112                 if ( $userId ) {
1113                         // check if the user has an edit
1114                         $attribs = array();
1115                         if ( $redContribsWhenNoEdits ) {
1116                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1117                                         $user = User::newFromId( $userId );
1118                                         $edits = $user->getEditCount();
1119                                 }
1120                                 if ( $edits === 0 ) {
1121                                         $attribs['class'] = 'new';
1122                                 }
1123                         }
1124                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1125
1126                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1127                 }
1128                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1129                         $items[] = self::blockLink( $userId, $userText );
1130                 }
1131
1132                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1133                         $items[] = self::emailLink( $userId, $userText );
1134                 }
1135
1136                 wfRunHooks( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
1137
1138                 if ( $items ) {
1139                         return wfMessage( 'word-separator' )->plain()
1140                                 . '<span class="mw-usertoollinks">'
1141                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1142                                 . '</span>';
1143                 } else {
1144                         return '';
1145                 }
1146         }
1147
1148         /**
1149          * Alias for userToolLinks( $userId, $userText, true );
1150          * @param $userId Integer: user identifier
1151          * @param $userText String: user name or IP address
1152          * @param $edits Integer: user edit count (optional, for performance)
1153          * @return String
1154          */
1155         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1156                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1157         }
1158
1159
1160         /**
1161          * @param $userId Integer: user id in database.
1162          * @param $userText String: user name in database.
1163          * @return String: HTML fragment with user talk link
1164          */
1165         public static function userTalkLink( $userId, $userText ) {
1166                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1167                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1168                 return $userTalkLink;
1169         }
1170
1171         /**
1172          * @param $userId Integer: userid
1173          * @param $userText String: user name in database.
1174          * @return String: HTML fragment with block link
1175          */
1176         public static function blockLink( $userId, $userText ) {
1177                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1178                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1179                 return $blockLink;
1180         }
1181
1182         /**
1183          * @param $userId Integer: userid
1184          * @param $userText String: user name in database.
1185          * @return String: HTML fragment with e-mail user link
1186          */
1187         public static function emailLink( $userId, $userText ) {
1188                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1189                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1190                 return $emailLink;
1191         }
1192
1193         /**
1194          * Generate a user link if the current user is allowed to view it
1195          * @param $rev Revision object.
1196          * @param $isPublic Boolean: show only if all users can see it
1197          * @return String: HTML fragment
1198          */
1199         public static function revUserLink( $rev, $isPublic = false ) {
1200                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1201                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1202                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1203                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1204                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1205                 } else {
1206                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1207                 }
1208                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1209                         return '<span class="history-deleted">' . $link . '</span>';
1210                 }
1211                 return $link;
1212         }
1213
1214         /**
1215          * Generate a user tool link cluster if the current user is allowed to view it
1216          * @param $rev Revision object.
1217          * @param $isPublic Boolean: show only if all users can see it
1218          * @return string HTML
1219          */
1220         public static function revUserTools( $rev, $isPublic = false ) {
1221                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1222                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1223                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1224                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1225                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1226                         $link = self::userLink( $userId, $userText )
1227                                 . wfMessage( 'word-separator' )->plain()
1228                                 . self::userToolLinks( $userId, $userText );
1229                 } else {
1230                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1231                 }
1232                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1233                         return ' <span class="history-deleted">' . $link . '</span>';
1234                 }
1235                 return $link;
1236         }
1237
1238         /**
1239          * This function is called by all recent changes variants, by the page history,
1240          * and by the user contributions list. It is responsible for formatting edit
1241          * comments. It escapes any HTML in the comment, but adds some CSS to format
1242          * auto-generated comments (from section editing) and formats [[wikilinks]].
1243          *
1244          * @author Erik Moeller <moeller@scireview.de>
1245          *
1246          * Note: there's not always a title to pass to this function.
1247          * Since you can't set a default parameter for a reference, I've turned it
1248          * temporarily to a value pass. Should be adjusted further. --brion
1249          *
1250          * @param $comment String
1251          * @param $title Mixed: Title object (to generate link to the section in autocomment) or null
1252          * @param $local Boolean: whether section links should refer to local page
1253          * @return mixed|String
1254          */
1255         public static function formatComment( $comment, $title = null, $local = false ) {
1256                 wfProfileIn( __METHOD__ );
1257
1258                 # Sanitize text a bit:
1259                 $comment = str_replace( "\n", " ", $comment );
1260                 # Allow HTML entities (for bug 13815)
1261                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1262
1263                 # Render autocomments and make links:
1264                 $comment = self::formatAutocomments( $comment, $title, $local );
1265                 $comment = self::formatLinksInComment( $comment, $title, $local );
1266
1267                 wfProfileOut( __METHOD__ );
1268                 return $comment;
1269         }
1270
1271         /**
1272          * @var Title
1273          */
1274         static $autocommentTitle;
1275         static $autocommentLocal;
1276
1277         /**
1278          * The pattern for autogen comments is / * foo * /, which makes for
1279          * some nasty regex.
1280          * We look for all comments, match any text before and after the comment,
1281          * add a separator where needed and format the comment itself with CSS
1282          * Called by Linker::formatComment.
1283          *
1284          * @param $comment String: comment text
1285          * @param $title Title|null An optional title object used to links to sections
1286          * @param $local Boolean: whether section links should refer to local page
1287          * @return String: formatted comment
1288          */
1289         private static function formatAutocomments( $comment, $title = null, $local = false ) {
1290                 // Bah!
1291                 self::$autocommentTitle = $title;
1292                 self::$autocommentLocal = $local;
1293                 $comment = preg_replace_callback(
1294                         '!(.*)/\*\s*(.*?)\s*\*/(.*)!',
1295                         array( 'Linker', 'formatAutocommentsCallback' ),
1296                         $comment );
1297                 self::$autocommentTitle = null;
1298                 self::$autocommentLocal = null;
1299                 return $comment;
1300         }
1301
1302         /**
1303          * @param $match
1304          * @return string
1305          */
1306         private static function formatAutocommentsCallback( $match ) {
1307                 global $wgLang;
1308                 $title = self::$autocommentTitle;
1309                 $local = self::$autocommentLocal;
1310
1311                 $pre = $match[1];
1312                 $auto = $match[2];
1313                 $post = $match[3];
1314                 $comment = null;
1315                 wfRunHooks( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local ) );
1316                 if ( $comment === null ) {
1317                         $link = '';
1318                         if ( $title ) {
1319                                 $section = $auto;
1320
1321                                 # Remove links that a user may have manually put in the autosummary
1322                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1323                                 $section = str_replace( '[[:', '', $section );
1324                                 $section = str_replace( '[[', '', $section );
1325                                 $section = str_replace( ']]', '', $section );
1326
1327                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1328                                 if ( $local ) {
1329                                         $sectionTitle = Title::newFromText( '#' . $section );
1330                                 } else {
1331                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1332                                                 $title->getDBkey(), $section );
1333                                 }
1334                                 if ( $sectionTitle ) {
1335                                         $link = self::link( $sectionTitle,
1336                                                 $wgLang->getArrow(), array(), array(),
1337                                                 'noclasses' );
1338                                 } else {
1339                                         $link = '';
1340                                 }
1341                         }
1342                         if ( $pre ) {
1343                                 # written summary $presep autocomment (summary /* section */)
1344                                 $pre .= wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1345                         }
1346                         if ( $post ) {
1347                                 # autocomment $postsep written summary (/* section */ summary)
1348                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1349                         }
1350                         $auto = '<span class="autocomment">' . $auto . '</span>';
1351                         $comment = $pre . $link . $wgLang->getDirMark() . '<span dir="auto">' . $auto . $post . '</span>';
1352                 }
1353                 return $comment;
1354         }
1355
1356         /**
1357          * @var Title
1358          */
1359         static $commentContextTitle;
1360         static $commentLocal;
1361
1362         /**
1363          * Formats wiki links and media links in text; all other wiki formatting
1364          * is ignored
1365          *
1366          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1367          * @param $comment String: text to format links in
1368          * @param $title Title|null An optional title object used to links to sections
1369          * @param $local Boolean: whether section links should refer to local page
1370          * @return String
1371          */
1372         public static function formatLinksInComment( $comment, $title = null, $local = false ) {
1373                 self::$commentContextTitle = $title;
1374                 self::$commentLocal = $local;
1375                 $html = preg_replace_callback(
1376                         '/\[\[:?(.*?)(\|(.*?))*\]\]([^[]*)/',
1377                         array( 'Linker', 'formatLinksInCommentCallback' ),
1378                         $comment );
1379                 self::$commentContextTitle = null;
1380                 self::$commentLocal = null;
1381                 return $html;
1382         }
1383
1384         /**
1385          * @param $match
1386          * @return mixed
1387          */
1388         protected static function formatLinksInCommentCallback( $match ) {
1389                 global $wgContLang;
1390
1391                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1392                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1393
1394                 $comment = $match[0];
1395
1396                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1397                 if ( strpos( $match[1], '%' ) !== false ) {
1398                         $match[1] = str_replace( array( '<', '>' ), array( '&lt;', '&gt;' ), rawurldecode( $match[1] ) );
1399                 }
1400
1401                 # Handle link renaming [[foo|text]] will show link as "text"
1402                 if ( $match[3] != "" ) {
1403                         $text = $match[3];
1404                 } else {
1405                         $text = $match[1];
1406                 }
1407                 $submatch = array();
1408                 $thelink = null;
1409                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1410                         # Media link; trail not supported.
1411                         $linkRegexp = '/\[\[(.*?)\]\]/';
1412                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1413                         if ( $title ) {
1414                                 $thelink = self::makeMediaLinkObj( $title, $text );
1415                         }
1416                 } else {
1417                         # Other kind of link
1418                         if ( preg_match( $wgContLang->linkTrail(), $match[4], $submatch ) ) {
1419                                 $trail = $submatch[1];
1420                         } else {
1421                                 $trail = "";
1422                         }
1423                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1424                         if ( isset( $match[1][0] ) && $match[1][0] == ':' )
1425                                 $match[1] = substr( $match[1], 1 );
1426                         list( $inside, $trail ) = self::splitTrail( $trail );
1427
1428                         $linkText = $text;
1429                         $linkTarget = self::normalizeSubpageLink( self::$commentContextTitle,
1430                                 $match[1], $linkText );
1431
1432                         $target = Title::newFromText( $linkTarget );
1433                         if ( $target ) {
1434                                 if ( $target->getText() == '' && $target->getInterwiki() === ''
1435                                         && !self::$commentLocal && self::$commentContextTitle )
1436                                 {
1437                                         $newTarget = clone ( self::$commentContextTitle );
1438                                         $newTarget->setFragment( '#' . $target->getFragment() );
1439                                         $target = $newTarget;
1440                                 }
1441                                 $thelink = self::link(
1442                                         $target,
1443                                         $linkText . $inside
1444                                 ) . $trail;
1445                         }
1446                 }
1447                 if ( $thelink ) {
1448                         // If the link is still valid, go ahead and replace it in!
1449                         $comment = preg_replace( $linkRegexp, StringUtils::escapeRegexReplacement( $thelink ), $comment, 1 );
1450                 }
1451
1452                 return $comment;
1453         }
1454
1455         /**
1456          * @param $contextTitle Title
1457          * @param  $target
1458          * @param  $text
1459          * @return string
1460          */
1461         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1462                 # Valid link forms:
1463                 # Foobar -- normal
1464                 # :Foobar -- override special treatment of prefix (images, language links)
1465                 # /Foobar -- convert to CurrentPage/Foobar
1466                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1467                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1468                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1469
1470                 wfProfileIn( __METHOD__ );
1471                 $ret = $target; # default return value is no change
1472
1473                 # Some namespaces don't allow subpages,
1474                 # so only perform processing if subpages are allowed
1475                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1476                         $hash = strpos( $target, '#' );
1477                         if ( $hash !== false ) {
1478                                 $suffix = substr( $target, $hash );
1479                                 $target = substr( $target, 0, $hash );
1480                         } else {
1481                                 $suffix = '';
1482                         }
1483                         # bug 7425
1484                         $target = trim( $target );
1485                         # Look at the first character
1486                         if ( $target != '' && $target[0] === '/' ) {
1487                                 # / at end means we don't want the slash to be shown
1488                                 $m = array();
1489                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1490                                 if ( $trailingSlashes ) {
1491                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1492                                 } else {
1493                                         $noslash = substr( $target, 1 );
1494                                 }
1495
1496                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1497                                 if ( $text === '' ) {
1498                                         $text = $target . $suffix;
1499                                 } # this might be changed for ugliness reasons
1500                         } else {
1501                                 # check for .. subpage backlinks
1502                                 $dotdotcount = 0;
1503                                 $nodotdot = $target;
1504                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1505                                         ++$dotdotcount;
1506                                         $nodotdot = substr( $nodotdot, 3 );
1507                                 }
1508                                 if ( $dotdotcount > 0 ) {
1509                                         $exploded = explode( '/', $contextTitle->GetPrefixedText() );
1510                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1511                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1512                                                 # / at the end means don't show full path
1513                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1514                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1515                                                         if ( $text === '' ) {
1516                                                                 $text = $nodotdot . $suffix;
1517                                                         }
1518                                                 }
1519                                                 $nodotdot = trim( $nodotdot );
1520                                                 if ( $nodotdot != '' ) {
1521                                                         $ret .= '/' . $nodotdot;
1522                                                 }
1523                                                 $ret .= $suffix;
1524                                         }
1525                                 }
1526                         }
1527                 }
1528
1529                 wfProfileOut( __METHOD__ );
1530                 return $ret;
1531         }
1532
1533         /**
1534          * Wrap a comment in standard punctuation and formatting if
1535          * it's non-empty, otherwise return empty string.
1536          *
1537          * @param $comment String
1538          * @param $title Mixed: Title object (to generate link to section in autocomment) or null
1539          * @param $local Boolean: whether section links should refer to local page
1540          *
1541          * @return string
1542          */
1543         public static function commentBlock( $comment, $title = null, $local = false ) {
1544                 // '*' used to be the comment inserted by the software way back
1545                 // in antiquity in case none was provided, here for backwards
1546                 // compatability, acc. to brion -ævar
1547                 if ( $comment == '' || $comment == '*' ) {
1548                         return '';
1549                 } else {
1550                         $formatted = self::formatComment( $comment, $title, $local );
1551                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1552                         return " <span class=\"comment\">$formatted</span>";
1553                 }
1554         }
1555
1556         /**
1557          * Wrap and format the given revision's comment block, if the current
1558          * user is allowed to view it.
1559          *
1560          * @param $rev Revision object
1561          * @param $local Boolean: whether section links should refer to local page
1562          * @param $isPublic Boolean: show only if all users can see it
1563          * @return String: HTML fragment
1564          */
1565         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1566                 if ( $rev->getRawComment() == "" ) {
1567                         return "";
1568                 }
1569                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1570                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1571                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1572                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1573                                 $rev->getTitle(), $local );
1574                 } else {
1575                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1576                 }
1577                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1578                         return " <span class=\"history-deleted\">$block</span>";
1579                 }
1580                 return $block;
1581         }
1582
1583         /**
1584          * @param $size
1585          * @return string
1586          */
1587         public static function formatRevisionSize( $size ) {
1588                 if ( $size == 0 ) {
1589                         $stxt = wfMessage( 'historyempty' )->escaped();
1590                 } else {
1591                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1592                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1593                 }
1594                 return "<span class=\"history-size\">$stxt</span>";
1595         }
1596
1597         /**
1598          * Add another level to the Table of Contents
1599          *
1600          * @return string
1601          */
1602         public static function tocIndent() {
1603                 return "\n<ul>";
1604         }
1605
1606         /**
1607          * Finish one or more sublevels on the Table of Contents
1608          *
1609          * @return string
1610          */
1611         public static function tocUnindent( $level ) {
1612                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1613         }
1614
1615         /**
1616          * parameter level defines if we are on an indentation level
1617          *
1618          * @return string
1619          */
1620         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1621                 $classes = "toclevel-$level";
1622                 if ( $sectionIndex !== false ) {
1623                         $classes .= " tocsection-$sectionIndex";
1624                 }
1625                 return "\n<li class=\"$classes\"><a href=\"#" .
1626                         $anchor . '"><span class="tocnumber">' .
1627                         $tocnumber . '</span> <span class="toctext">' .
1628                         $tocline . '</span></a>';
1629         }
1630
1631         /**
1632          * End a Table Of Contents line.
1633          * tocUnindent() will be used instead if we're ending a line below
1634          * the new level.
1635          * @return string
1636          */
1637         public static function tocLineEnd() {
1638                 return "</li>\n";
1639         }
1640
1641         /**
1642          * Wraps the TOC in a table and provides the hide/collapse javascript.
1643          *
1644          * @param $toc String: html of the Table Of Contents
1645          * @param $lang String|Language|false: Language for the toc title, defaults to user language
1646          * @return String: full html of the TOC
1647          */
1648         public static function tocList( $toc, $lang = false ) {
1649                 $lang = wfGetLangObj( $lang );
1650                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1651
1652                 return
1653                    '<table id="toc" class="toc"><tr><td>'
1654                  . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1655                  . $toc
1656                  . "</ul>\n</td></tr></table>\n";
1657         }
1658
1659         /**
1660          * Generate a table of contents from a section tree
1661          * Currently unused.
1662          *
1663          * @param $tree array Return value of ParserOutput::getSections()
1664          * @return String: HTML fragment
1665          */
1666         public static function generateTOC( $tree ) {
1667                 $toc = '';
1668                 $lastLevel = 0;
1669                 foreach ( $tree as $section ) {
1670                         if ( $section['toclevel'] > $lastLevel )
1671                                 $toc .= self::tocIndent();
1672                         elseif ( $section['toclevel'] < $lastLevel )
1673                                 $toc .= self::tocUnindent(
1674                                         $lastLevel - $section['toclevel'] );
1675                         else
1676                                 $toc .= self::tocLineEnd();
1677
1678                         $toc .= self::tocLine( $section['anchor'],
1679                                 $section['line'], $section['number'],
1680                                 $section['toclevel'], $section['index'] );
1681                         $lastLevel = $section['toclevel'];
1682                 }
1683                 $toc .= self::tocLineEnd();
1684                 return self::tocList( $toc );
1685         }
1686
1687         /**
1688          * Create a headline for content
1689          *
1690          * @param $level Integer: the level of the headline (1-6)
1691          * @param $attribs String: any attributes for the headline, starting with
1692          *                 a space and ending with '>'
1693          *                 This *must* be at least '>' for no attribs
1694          * @param $anchor String: the anchor to give the headline (the bit after the #)
1695          * @param $html String: html for the text of the header
1696          * @param $link String: HTML to add for the section edit link
1697          * @param $legacyAnchor Mixed: a second, optional anchor to give for
1698          *   backward compatibility (false to omit)
1699          *
1700          * @return String: HTML headline
1701          */
1702         public static function makeHeadline( $level, $attribs, $anchor, $html, $link, $legacyAnchor = false ) {
1703                 $ret = "<h$level$attribs"
1704                         . $link
1705                         . " <span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1706                         . "</h$level>";
1707                 if ( $legacyAnchor !== false ) {
1708                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1709                 }
1710                 return $ret;
1711         }
1712
1713         /**
1714          * Split a link trail, return the "inside" portion and the remainder of the trail
1715          * as a two-element array
1716          * @return array
1717          */
1718         static function splitTrail( $trail ) {
1719                 global $wgContLang;
1720                 $regex = $wgContLang->linkTrail();
1721                 $inside = '';
1722                 if ( $trail !== '' ) {
1723                         $m = array();
1724                         if ( preg_match( $regex, $trail, $m ) ) {
1725                                 $inside = $m[1];
1726                                 $trail = $m[2];
1727                         }
1728                 }
1729                 return array( $inside, $trail );
1730         }
1731
1732         /**
1733          * Generate a rollback link for a given revision.  Currently it's the
1734          * caller's responsibility to ensure that the revision is the top one. If
1735          * it's not, of course, the user will get an error message.
1736          *
1737          * If the calling page is called with the parameter &bot=1, all rollback
1738          * links also get that parameter. It causes the edit itself and the rollback
1739          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1740          * changes, so this allows sysops to combat a busy vandal without bothering
1741          * other users.
1742          *
1743          * @param $rev Revision object
1744          * @param $context IContextSource context to use or null for the main context.
1745          * @return string
1746          */
1747         public static function generateRollback( $rev, IContextSource $context = null ) {
1748                 if ( $context === null ) {
1749                         $context = RequestContext::getMain();
1750                 }
1751
1752                 return '<span class="mw-rollback-link">'
1753                         . $context->msg( 'brackets' )->rawParams(
1754                                 self::buildRollbackLink( $rev, $context ) )->plain()
1755                         . '</span>';
1756         }
1757
1758         /**
1759          * Build a raw rollback link, useful for collections of "tool" links
1760          *
1761          * @param $rev Revision object
1762          * @param $context IContextSource context to use or null for the main context.
1763          * @return String: HTML fragment
1764          */
1765         public static function buildRollbackLink( $rev, IContextSource $context = null ) {
1766                 global $wgShowRollbackEditCount, $wgMiserMode;
1767
1768                 // To config which pages are effected by miser mode
1769                 $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );
1770
1771                 if ( $context === null ) {
1772                         $context = RequestContext::getMain();
1773                 }
1774
1775                 $title = $rev->getTitle();
1776                 $query = array(
1777                         'action' => 'rollback',
1778                         'from' => $rev->getUserText(),
1779                         'token' => $context->getUser()->getEditToken( array( $title->getPrefixedText(), $rev->getUserText() ) ),
1780                 );
1781                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1782                         $query['bot'] = '1';
1783                         $query['hidediff'] = '1'; // bug 15999
1784                 }
1785
1786                 $disableRollbackEditCount = false;
1787                 if( $wgMiserMode ) {
1788                         foreach( $disableRollbackEditCountSpecialPage as $specialPage ) {
1789                                 if( $context->getTitle()->isSpecial( $specialPage ) ) {
1790                                         $disableRollbackEditCount = true;
1791                                         break;
1792                                 }
1793                         }
1794                 }
1795
1796                 if( !$disableRollbackEditCount && is_int( $wgShowRollbackEditCount ) && $wgShowRollbackEditCount > 0 ) {
1797                         $dbr = wfGetDB( DB_SLAVE );
1798
1799                         // Up to the value of $wgShowRollbackEditCount revisions are counted
1800                         $res = $dbr->select( 'revision',
1801                                 array( 'rev_id', 'rev_user_text' ),
1802                                 // $rev->getPage() returns null sometimes
1803                                 array( 'rev_page' => $rev->getTitle()->getArticleID() ),
1804                                 __METHOD__,
1805                                 array(  'USE INDEX' => 'page_timestamp',
1806                                         'ORDER BY' => 'rev_timestamp DESC',
1807                                         'LIMIT' => $wgShowRollbackEditCount + 1 )
1808                         );
1809
1810                         $editCount = 0;
1811                         while( $row = $dbr->fetchObject( $res ) ) {
1812                                 if( $rev->getUserText() != $row->rev_user_text ) {
1813                                         break;
1814                                 }
1815                                 $editCount++;
1816                         }
1817
1818                         if( $editCount > $wgShowRollbackEditCount ) {
1819                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )->numParams( $wgShowRollbackEditCount )->parse();
1820                         } else {
1821                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1822                         }
1823
1824                         return self::link(
1825                                 $title,
1826                                 $editCount_output,
1827                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1828                                 $query,
1829                                 array( 'known', 'noclasses' )
1830                         );
1831                 } else {
1832                         return self::link(
1833                                 $title,
1834                                 $context->msg( 'rollbacklink' )->escaped(),
1835                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1836                                 $query,
1837                                 array( 'known', 'noclasses' )
1838                         );
1839                 }
1840         }
1841
1842         /**
1843          * Returns HTML for the "templates used on this page" list.
1844          *
1845          * @param $templates Array of templates from Article::getUsedTemplate
1846          * or similar
1847          * @param $preview Boolean: whether this is for a preview
1848          * @param $section Boolean: whether this is for a section edit
1849          * @return String: HTML output
1850          */
1851         public static function formatTemplates( $templates, $preview = false, $section = false ) {
1852                 wfProfileIn( __METHOD__ );
1853
1854                 $outText = '';
1855                 if ( count( $templates ) > 0 ) {
1856                         # Do a batch existence check
1857                         $batch = new LinkBatch;
1858                         foreach ( $templates as $title ) {
1859                                 $batch->addObj( $title );
1860                         }
1861                         $batch->execute();
1862
1863                         # Construct the HTML
1864                         $outText = '<div class="mw-templatesUsedExplanation">';
1865                         if ( $preview ) {
1866                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
1867                                         ->parseAsBlock();
1868                         } elseif ( $section ) {
1869                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
1870                                         ->parseAsBlock();
1871                         } else {
1872                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
1873                                         ->parseAsBlock();
1874                         }
1875                         $outText .= "</div><ul>\n";
1876
1877                         usort( $templates, 'Title::compare' );
1878                         foreach ( $templates as $titleObj ) {
1879                                 $r = $titleObj->getRestrictions( 'edit' );
1880                                 if ( in_array( 'sysop', $r ) ) {
1881                                         $protected = wfMessage( 'template-protected' )->parse();
1882                                 } elseif ( in_array( 'autoconfirmed', $r ) ) {
1883                                         $protected = wfMessage( 'template-semiprotected' )->parse();
1884                                 } else {
1885                                         $protected = '';
1886                                 }
1887                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
1888                                         $editLink = self::link(
1889                                                 $titleObj,
1890                                                 wfMessage( 'editlink' )->text(),
1891                                                 array(),
1892                                                 array( 'action' => 'edit' )
1893                                         );
1894                                 } else {
1895                                         $editLink = self::link(
1896                                                 $titleObj,
1897                                                 wfMessage( 'viewsourcelink' )->text(),
1898                                                 array(),
1899                                                 array( 'action' => 'edit' )
1900                                         );
1901                                 }
1902                                 $outText .= '<li>' . self::link( $titleObj ) . ' (' . $editLink . ') ' . $protected . '</li>';
1903                         }
1904                         $outText .= '</ul>';
1905                 }
1906                 wfProfileOut( __METHOD__  );
1907                 return $outText;
1908         }
1909
1910         /**
1911          * Returns HTML for the "hidden categories on this page" list.
1912          *
1913          * @param $hiddencats Array of hidden categories from Article::getHiddenCategories
1914          * or similar
1915          * @return String: HTML output
1916          */
1917         public static function formatHiddenCategories( $hiddencats ) {
1918                 wfProfileIn( __METHOD__ );
1919
1920                 $outText = '';
1921                 if ( count( $hiddencats ) > 0 ) {
1922                         # Construct the HTML
1923                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
1924                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
1925                         $outText .= "</div><ul>\n";
1926
1927                         foreach ( $hiddencats as $titleObj ) {
1928                                 $outText .= '<li>' . self::link( $titleObj, null, array(), array(), 'known' ) . "</li>\n"; # If it's hidden, it must exist - no need to check with a LinkBatch
1929                         }
1930                         $outText .= '</ul>';
1931                 }
1932                 wfProfileOut( __METHOD__  );
1933                 return $outText;
1934         }
1935
1936         /**
1937          * Format a size in bytes for output, using an appropriate
1938          * unit (B, KB, MB or GB) according to the magnitude in question
1939          *
1940          * @param $size int Size to format
1941          * @return String
1942          */
1943         public static function formatSize( $size ) {
1944                 global $wgLang;
1945                 return htmlspecialchars( $wgLang->formatSize( $size ) );
1946         }
1947
1948         /**
1949          * Given the id of an interface element, constructs the appropriate title
1950          * attribute from the system messages.  (Note, this is usually the id but
1951          * isn't always, because sometimes the accesskey needs to go on a different
1952          * element than the id, for reverse-compatibility, etc.)
1953          *
1954          * @param $name String: id of the element, minus prefixes.
1955          * @param $options Mixed: null or the string 'withaccess' to add an access-
1956          *   key hint
1957          * @return String: contents of the title attribute (which you must HTML-
1958          *   escape), or false for no title attribute
1959          */
1960         public static function titleAttrib( $name, $options = null ) {
1961                 wfProfileIn( __METHOD__ );
1962
1963                 $message = wfMessage( "tooltip-$name" );
1964
1965                 if ( !$message->exists() ) {
1966                         $tooltip = false;
1967                 } else {
1968                         $tooltip = $message->text();
1969                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
1970                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
1971                         # Message equal to '-' means suppress it.
1972                         if (  $tooltip == '-' ) {
1973                                 $tooltip = false;
1974                         }
1975                 }
1976
1977                 if ( $options == 'withaccess' ) {
1978                         $accesskey = self::accesskey( $name );
1979                         if ( $accesskey !== false ) {
1980                                 if ( $tooltip === false || $tooltip === '' ) {
1981                                         $tooltip = "[$accesskey]";
1982                                 } else {
1983                                         $tooltip .= " [$accesskey]";
1984                                 }
1985                         }
1986                 }
1987
1988                 wfProfileOut( __METHOD__ );
1989                 return $tooltip;
1990         }
1991
1992         static $accesskeycache;
1993
1994         /**
1995          * Given the id of an interface element, constructs the appropriate
1996          * accesskey attribute from the system messages.  (Note, this is usually
1997          * the id but isn't always, because sometimes the accesskey needs to go on
1998          * a different element than the id, for reverse-compatibility, etc.)
1999          *
2000          * @param $name String: id of the element, minus prefixes.
2001          * @return String: contents of the accesskey attribute (which you must HTML-
2002          *   escape), or false for no accesskey attribute
2003          */
2004         public static function accesskey( $name ) {
2005                 if ( isset( self::$accesskeycache[$name] ) ) {
2006                         return self::$accesskeycache[$name];
2007                 }
2008                 wfProfileIn( __METHOD__ );
2009
2010                 $message = wfMessage( "accesskey-$name" );
2011
2012                 if ( !$message->exists() ) {
2013                         $accesskey = false;
2014                 } else {
2015                         $accesskey = $message->plain();
2016                         if ( $accesskey === '' || $accesskey === '-' ) {
2017                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2018                                 # attribute, but this is broken for accesskey: that might be a useful
2019                                 # value.
2020                                 $accesskey = false;
2021                         }
2022                 }
2023
2024                 wfProfileOut( __METHOD__ );
2025                 return self::$accesskeycache[$name] = $accesskey;
2026         }
2027
2028         /**
2029          * Get a revision-deletion link, or disabled link, or nothing, depending
2030          * on user permissions & the settings on the revision.
2031          *
2032          * Will use forward-compatible revision ID in the Special:RevDelete link
2033          * if possible, otherwise the timestamp-based ID which may break after
2034          * undeletion.
2035          *
2036          * @param User $user
2037          * @param Revision $rev
2038          * @param Revision $title
2039          * @return string HTML fragment
2040          */
2041         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2042                 $canHide = $user->isAllowed( 'deleterevision' );
2043                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2044                         return '';
2045                 }
2046
2047                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2048                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2049                 } else {
2050                         if ( $rev->getId() ) {
2051                                 // RevDelete links using revision ID are stable across
2052                                 // page deletion and undeletion; use when possible.
2053                                 $query = array(
2054                                         'type'   => 'revision',
2055                                         'target' => $title->getPrefixedDBkey(),
2056                                         'ids'    => $rev->getId()
2057                                 );
2058                         } else {
2059                                 // Older deleted entries didn't save a revision ID.
2060                                 // We have to refer to these by timestamp, ick!
2061                                 $query = array(
2062                                         'type'   => 'archive',
2063                                         'target' => $title->getPrefixedDBkey(),
2064                                         'ids'    => $rev->getTimestamp()
2065                                 );
2066                         }
2067                         return Linker::revDeleteLink( $query,
2068                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2069                 }
2070         }
2071
2072         /**
2073          * Creates a (show/hide) link for deleting revisions/log entries
2074          *
2075          * @param $query Array: query parameters to be passed to link()
2076          * @param $restricted Boolean: set to true to use a "<strong>" instead of a "<span>"
2077          * @param $delete Boolean: set to true to use (show/hide) rather than (show)
2078          *
2079          * @return String: HTML "<a>" link to Special:Revisiondelete, wrapped in a
2080          * span to allow for customization of appearance with CSS
2081          */
2082         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
2083                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2084                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2085                 $html = wfMessage( $msgKey )->escaped();
2086                 $tag = $restricted ? 'strong' : 'span';
2087                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
2088                 return Xml::tags( $tag, array( 'class' => 'mw-revdelundel-link' ), wfMessage( 'parentheses' )->rawParams( $link )->escaped() );
2089         }
2090
2091         /**
2092          * Creates a dead (show/hide) link for deleting revisions/log entries
2093          *
2094          * @param $delete Boolean: set to true to use (show/hide) rather than (show)
2095          *
2096          * @return string HTML text wrapped in a span to allow for customization
2097          * of appearance with CSS
2098          */
2099         public static function revDeleteLinkDisabled( $delete = true ) {
2100                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2101                 $html = wfMessage( $msgKey )->escaped();
2102                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2103                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
2104         }
2105
2106         /* Deprecated methods */
2107
2108         /**
2109          * @deprecated since 1.16 Use link()
2110          *
2111          * This function is a shortcut to makeBrokenLinkObj(Title::newFromText($title),...). Do not call
2112          * it if you already have a title object handy. See makeBrokenLinkObj for further documentation.
2113          *
2114          * @param $title String: The text of the title
2115          * @param $text String: Link text
2116          * @param $query String: Optional query part
2117          * @param $trail String: Optional trail. Alphabetic characters at the start of this string will
2118          *               be included in the link text. Other characters will be appended after
2119          *               the end of the link.
2120          * @return string
2121          */
2122         static function makeBrokenLink( $title, $text = '', $query = '', $trail = '' ) {
2123                 wfDeprecated( __METHOD__, '1.16' );
2124
2125                 $nt = Title::newFromText( $title );
2126                 if ( $nt instanceof Title ) {
2127                         return self::makeBrokenLinkObj( $nt, $text, $query, $trail );
2128                 } else {
2129                         wfDebug( 'Invalid title passed to self::makeBrokenLink(): "' . $title . "\"\n" );
2130                         return $text == '' ? $title : $text;
2131                 }
2132         }
2133
2134         /**
2135          * @deprecated since 1.16 Use link()
2136          *
2137          * Make a link for a title which may or may not be in the database. If you need to
2138          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
2139          * call to this will result in a DB query.
2140          *
2141          * @param $nt     Title: the title object to make the link from, e.g. from
2142          *                      Title::newFromText.
2143          * @param $text  String: link text
2144          * @param $query String: optional query part
2145          * @param $trail String: optional trail. Alphabetic characters at the start of this string will
2146          *                      be included in the link text. Other characters will be appended after
2147          *                      the end of the link.
2148          * @param $prefix String: optional prefix. As trail, only before instead of after.
2149          * @return string
2150          */
2151         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2152                 # wfDeprecated( __METHOD__, '1.16' ); // See r105985 and it's revert. Somewhere still used.
2153
2154                 wfProfileIn( __METHOD__ );
2155                 $query = wfCgiToArray( $query );
2156                 list( $inside, $trail ) = self::splitTrail( $trail );
2157                 if ( $text === '' ) {
2158                         $text = self::linkText( $nt );
2159                 }
2160
2161                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
2162
2163                 wfProfileOut( __METHOD__ );
2164                 return $ret;
2165         }
2166
2167         /**
2168          * @deprecated since 1.16 Use link()
2169          *
2170          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
2171          * it doesn't have to do a database query. It's also valid for interwiki titles and special
2172          * pages.
2173          *
2174          * @param $title  Title object of target page
2175          * @param $text   String: text to replace the title
2176          * @param $query  String: link target
2177          * @param $trail  String: text after link
2178          * @param $prefix String: text before link text
2179          * @param $aprops String: extra attributes to the a-element
2180          * @param $style  String: style to apply - if empty, use getInternalLinkAttributesObj instead
2181          * @return string the a-element
2182          */
2183         static function makeKnownLinkObj(
2184                 $title, $text = '', $query = '', $trail = '', $prefix = '' , $aprops = '', $style = ''
2185         ) {
2186                 # wfDeprecated( __METHOD__, '1.16' ); // See r105985 and it's revert. Somewhere still used.
2187
2188                 wfProfileIn( __METHOD__ );
2189
2190                 if ( $text == '' ) {
2191                         $text = self::linkText( $title );
2192                 }
2193                 $attribs = Sanitizer::mergeAttributes(
2194                         Sanitizer::decodeTagAttributes( $aprops ),
2195                         Sanitizer::decodeTagAttributes( $style )
2196                 );
2197                 $query = wfCgiToArray( $query );
2198                 list( $inside, $trail ) = self::splitTrail( $trail );
2199
2200                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
2201                         array( 'known', 'noclasses' ) ) . $trail;
2202
2203                 wfProfileOut( __METHOD__ );
2204                 return $ret;
2205         }
2206
2207         /**
2208          * @deprecated since 1.16 Use link()
2209          *
2210          * Make a red link to the edit page of a given title.
2211          *
2212          * @param $title Title object of the target page
2213          * @param $text  String: Link text
2214          * @param $query String: Optional query part
2215          * @param $trail String: Optional trail. Alphabetic characters at the start of this string will
2216          *                      be included in the link text. Other characters will be appended after
2217          *                      the end of the link.
2218          * @param $prefix String: Optional prefix
2219          * @return string
2220          */
2221         static function makeBrokenLinkObj( $title, $text = '', $query = '', $trail = '', $prefix = '' ) {
2222                 wfDeprecated( __METHOD__, '1.16' );
2223
2224                 wfProfileIn( __METHOD__ );
2225
2226                 list( $inside, $trail ) = self::splitTrail( $trail );
2227                 if ( $text === '' ) {
2228                         $text = self::linkText( $title );
2229                 }
2230
2231                 $ret = self::link( $title, "$prefix$text$inside", array(),
2232                         wfCgiToArray( $query ), 'broken' ) . $trail;
2233
2234                 wfProfileOut( __METHOD__ );
2235                 return $ret;
2236         }
2237
2238         /**
2239          * @deprecated since 1.16 Use link()
2240          *
2241          * Make a coloured link.
2242          *
2243          * @param $nt Title object of the target page
2244          * @param $colour Integer: colour of the link
2245          * @param $text   String:  link text
2246          * @param $query  String:  optional query part
2247          * @param $trail  String:  optional trail. Alphabetic characters at the start of this string will
2248          *                      be included in the link text. Other characters will be appended after
2249          *                      the end of the link.
2250          * @param $prefix String: Optional prefix
2251          * @return string
2252          */
2253         static function makeColouredLinkObj( $nt, $colour, $text = '', $query = '', $trail = '', $prefix = '' ) {
2254                 wfDeprecated( __METHOD__, '1.16' );
2255
2256                 if ( $colour != '' ) {
2257                         $style = self::getInternalLinkAttributesObj( $nt, $text, $colour );
2258                 } else {
2259                         $style = '';
2260                 }
2261                 return self::makeKnownLinkObj( $nt, $text, $query, $trail, $prefix, '', $style );
2262         }
2263
2264         /**
2265          * Returns the attributes for the tooltip and access key.
2266          * @return array
2267          */
2268         public static function tooltipAndAccesskeyAttribs( $name ) {
2269                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2270                 # no attribute" instead of "output '' as value for attribute", this
2271                 # would be three lines.
2272                 $attribs = array(
2273                         'title' => self::titleAttrib( $name, 'withaccess' ),
2274                         'accesskey' => self::accesskey( $name )
2275                 );
2276                 if ( $attribs['title'] === false ) {
2277                         unset( $attribs['title'] );
2278                 }
2279                 if ( $attribs['accesskey'] === false ) {
2280                         unset( $attribs['accesskey'] );
2281                 }
2282                 return $attribs;
2283         }
2284
2285         /**
2286          * Returns raw bits of HTML, use titleAttrib()
2287          * @return null|string
2288          */
2289         public static function tooltip( $name, $options = null ) {
2290                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2291                 # no attribute" instead of "output '' as value for attribute", this
2292                 # would be two lines.
2293                 $tooltip = self::titleAttrib( $name, $options );
2294                 if ( $tooltip === false ) {
2295                         return '';
2296                 }
2297                 return Xml::expandAttributes( array(
2298                         'title' => $tooltip
2299                 ) );
2300         }
2301 }
2302
2303 /**
2304  * @since 1.18
2305  */
2306 class DummyLinker {
2307
2308         /**
2309          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2310          * into static calls to the new Linker for backwards compatibility.
2311          *
2312          * @param $fname String Name of called method
2313          * @param $args Array Arguments to the method
2314          * @return mixed
2315          */
2316         public function __call( $fname, $args ) {
2317                 return call_user_func_array( array( 'Linker', $fname ), $args );
2318         }
2319 }