includes/Linker.php

   1 <?php
   2 /**
   3  * Methods to make links and related items.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Some internal bits split of from Skin.php. These functions are used
  25  * for primarily page content: links, embedded images, table of contents. Links
  26  * are also used in the skin.
  27  *
  28  * @todo turn this into a legacy interface for HtmlPageLinkRenderer and similar services.
  29  *
  30  * @ingroup Skins
  31  */
  32 class Linker {
  33         /**
  34          * Flags for userToolLinks()
  35          */
  36         const TOOL_LINKS_NOBLOCK = 1;
  37         const TOOL_LINKS_EMAIL = 2;
  38
  39         /**
  40          * Get the appropriate HTML attributes to add to the "a" element of an interwiki link.
  41          *
  42          * @deprecated since 1.25
  43          *
  44          * @param string $title The title text for the link, URL-encoded (???) but
  45          *   not HTML-escaped
  46          * @param string $unused Unused
  47          * @param string $class The contents of the class attribute; if an empty
  48          *   string is passed, which is the default value, defaults to 'external'.
  49          * @return string
  50          */
  51         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  52                 global $wgContLang;
  53
  54                 wfDeprecated( __METHOD__, '1.25' );
  55
  56                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  57                 # getExternalLinkAttributes, why?
  58                 $title = urldecode( $title );
  59                 $title = $wgContLang->checkTitleEncoding( $title );
  60                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  61
  62                 return self::getLinkAttributesInternal( $title, $class );
  63         }
  64
  65         /**
  66          * Get the appropriate HTML attributes to add to the "a" element of an internal link.
  67          *
  68          * @deprecated since 1.25
  69          *
  70          * @param string $title The title text for the link, URL-encoded (???) but
  71          *   not HTML-escaped
  72          * @param string $unused Unused
  73          * @param string $class The contents of the class attribute, default none
  74          * @return string
  75          */
  76         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  77                 wfDeprecated( __METHOD__, '1.25' );
  78
  79                 $title = urldecode( $title );
  80                 $title = str_replace( '_', ' ', $title );
  81                 return self::getLinkAttributesInternal( $title, $class );
  82         }
  83
  84         /**
  85          * Get the appropriate HTML attributes to add to the "a" element of an internal
  86          * link, given the Title object for the page we want to link to.
  87          *
  88          * @deprecated since 1.25
  89          *
  90          * @param Title $nt
  91          * @param string $unused Unused
  92          * @param string $class The contents of the class attribute, default none
  93          * @param string|bool $title Optional (unescaped) string to use in the title
  94          *   attribute; if false, default to the name of the page we're linking to
  95          * @return string
  96          */
  97         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
  98                 wfDeprecated( __METHOD__, '1.25' );
  99
 100                 if ( $title === false ) {
 101                         $title = $nt->getPrefixedText();
 102                 }
 103                 return self::getLinkAttributesInternal( $title, $class );
 104         }
 105
 106         /**
 107          * Common code for getLinkAttributesX functions
 108          *
 109          * @deprecated since 1.25
 110          *
 111          * @param string $title
 112          * @param string $class
 113          *
 114          * @return string
 115          */
 116         private static function getLinkAttributesInternal( $title, $class ) {
 117                 wfDeprecated( __METHOD__, '1.25' );
 118
 119                 $title = htmlspecialchars( $title );
 120                 $class = htmlspecialchars( $class );
 121                 $r = '';
 122                 if ( $class != '' ) {
 123                         $r .= " class=\"$class\"";
 124                 }
 125                 if ( $title != '' ) {
 126                         $r .= " title=\"$title\"";
 127                 }
 128                 return $r;
 129         }
 130
 131         /**
 132          * Return the CSS colour of a known link
 133          *
 134          * @param Title $t
 135          * @param int $threshold User defined threshold
 136          * @return string CSS class
 137          */
 138         public static function getLinkColour( $t, $threshold ) {
 139                 $colour = '';
 140                 if ( $t->isRedirect() ) {
 141                         # Page is a redirect
 142                         $colour = 'mw-redirect';
 143                 } elseif ( $threshold > 0 && $t->isContentPage() &&
 144                         $t->exists() && $t->getLength() < $threshold
 145                 ) {
 146                         # Page is a stub
 147                         $colour = 'stub';
 148                 }
 149                 return $colour;
 150         }
 151
 152         /**
 153          * This function returns an HTML link to the given target.  It serves a few
 154          * purposes:
 155          *   1) If $target is a Title, the correct URL to link to will be figured
 156          *      out automatically.
 157          *   2) It automatically adds the usual classes for various types of link
 158          *      targets: "new" for red links, "stub" for short articles, etc.
 159          *   3) It escapes all attribute values safely so there's no risk of XSS.
 160          *   4) It provides a default tooltip if the target is a Title (the page
 161          *      name of the target).
 162          * link() replaces the old functions in the makeLink() family.
 163          *
 164          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 165          *
 166          * @param Title $target Can currently only be a Title, but this may
 167          *   change to support Images, literal URLs, etc.
 168          * @param string $html The HTML contents of the <a> element, i.e.,
 169          *   the link text.  This is raw HTML and will not be escaped.  If null,
 170          *   defaults to the prefixed text of the Title; or if the Title is just a
 171          *   fragment, the contents of the fragment.
 172          * @param array $customAttribs A key => value array of extra HTML attributes,
 173          *   such as title and class.  (href is ignored.)  Classes will be
 174          *   merged with the default classes, while other attributes will replace
 175          *   default attributes.  All passed attribute values will be HTML-escaped.
 176          *   A false attribute value means to suppress that attribute.
 177          * @param array $query The query string to append to the URL
 178          *   you're linking to, in key => value array form.  Query keys and values
 179          *   will be URL-encoded.
 180          * @param string|array $options String or array of strings:
 181          *     'known': Page is known to exist, so don't check if it does.
 182          *     'broken': Page is known not to exist, so don't check if it does.
 183          *     'noclasses': Don't add any classes automatically (includes "new",
 184          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
 185          *       provided, if any, so you get a simple blue link with no funny i-
 186          *       cons.
 187          *     'forcearticlepath': Use the article path always, even with a querystring.
 188          *       Has compatibility issues on some setups, so avoid wherever possible.
 189          *     'http': Force a full URL with http:// as the scheme.
 190          *     'https': Force a full URL with https:// as the scheme.
 191          * @return string HTML <a> attribute
 192          */
 193         public static function link(
 194                 $target, $html = null, $customAttribs = array(), $query = array(), $options = array()
 195         ) {
 196                 if ( !$target instanceof Title ) {
 197                         wfWarn( __METHOD__ . ': Requires $target to be a Title object.', 2 );
 198                         return "<!-- ERROR -->$html";
 199                 }
 200                 wfProfileIn( __METHOD__ );
 201
 202                 if ( is_string( $query ) ) {
 203                         // some functions withing core using this still hand over query strings
 204                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
 205                         $query = wfCgiToArray( $query );
 206                 }
 207                 $options = (array)$options;
 208
 209                 $dummy = new DummyLinker; // dummy linker instance for bc on the hooks
 210
 211                 $ret = null;
 212                 if ( !wfRunHooks( 'LinkBegin',
 213                         array( $dummy, $target, &$html, &$customAttribs, &$query, &$options, &$ret ) )
 214                 ) {
 215                         wfProfileOut( __METHOD__ );
 216                         return $ret;
 217                 }
 218
 219                 # Normalize the Title if it's a special page
 220                 $target = self::normaliseSpecialPage( $target );
 221
 222                 # If we don't know whether the page exists, let's find out.
 223                 wfProfileIn( __METHOD__ . '-checkPageExistence' );
 224                 if ( !in_array( 'known', $options ) && !in_array( 'broken', $options ) ) {
 225                         if ( $target->isKnown() ) {
 226                                 $options[] = 'known';
 227                         } else {
 228                                 $options[] = 'broken';
 229                         }
 230                 }
 231                 wfProfileOut( __METHOD__ . '-checkPageExistence' );
 232
 233                 $oldquery = array();
 234                 if ( in_array( "forcearticlepath", $options ) && $query ) {
 235                         $oldquery = $query;
 236                         $query = array();
 237                 }
 238
 239                 # Note: we want the href attribute first, for prettiness.
 240                 $attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
 241                 if ( in_array( 'forcearticlepath', $options ) && $oldquery ) {
 242                         $attribs['href'] = wfAppendQuery( $attribs['href'], $oldquery );
 243                 }
 244
 245                 $attribs = array_merge(
 246                         $attribs,
 247                         self::linkAttribs( $target, $customAttribs, $options )
 248                 );
 249                 if ( is_null( $html ) ) {
 250                         $html = self::linkText( $target );
 251                 }
 252
 253                 $ret = null;
 254                 if ( wfRunHooks( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
 255                         $ret = Html::rawElement( 'a', $attribs, $html );
 256                 }
 257
 258                 wfProfileOut( __METHOD__ );
 259                 return $ret;
 260         }
 261
 262         /**
 263          * Identical to link(), except $options defaults to 'known'.
 264          * @see Linker::link
 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 Title $target
 278          * @param array $query Query parameters
 279          * @param array $options
 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->hasFragment() ) {
 287                         $target = clone $target;
 288                         $target->setFragment( '' );
 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 Title $target
 317          * @param array $attribs
 318          * @param array $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' && $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 Title $target
 381          *
 382          * @return string
 383          */
 384         private static function linkText( $target ) {
 385                 if ( !$target instanceof Title ) {
 386                         wfWarn( __METHOD__ . ': Requires $target to be a Title object.' );
 387                         return '';
 388                 }
 389                 // If the target is just a fragment, with no title, we return the fragment
 390                 // text.  Otherwise, we return the title text itself.
 391                 if ( $target->getPrefixedText() === '' && $target->hasFragment() ) {
 392                         return htmlspecialchars( $target->getFragment() );
 393                 }
 394
 395                 return htmlspecialchars( $target->getPrefixedText() );
 396         }
 397
 398         /**
 399          * Make appropriate markup for a link to the current article. This is
 400          * currently rendered as the bold link text. The calling sequence is the
 401          * same as the other make*LinkObj static functions, despite $query not
 402          * being used.
 403          *
 404          * @param Title $nt
 405          * @param string $html [optional]
 406          * @param string $query [optional]
 407          * @param string $trail [optional]
 408          * @param string $prefix [optional]
 409          *
 410          * @return string
 411          */
 412         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 413                 $ret = "<strong class=\"selflink\">{$prefix}{$html}</strong>{$trail}";
 414                 if ( !wfRunHooks( 'SelfLinkBegin', array( $nt, &$html, &$trail, &$prefix, &$ret ) ) ) {
 415                         return $ret;
 416                 }
 417
 418                 if ( $html == '' ) {
 419                         $html = htmlspecialchars( $nt->getPrefixedText() );
 420                 }
 421                 list( $inside, $trail ) = self::splitTrail( $trail );
 422                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 423         }
 424
 425         /**
 426          * Get a message saying that an invalid title was encountered.
 427          * This should be called after a method like Title::makeTitleSafe() returned
 428          * a value indicating that the title object is invalid.
 429          *
 430          * @param IContextSource $context Context to use to get the messages
 431          * @param int $namespace Namespace number
 432          * @param string $title Text of the title, without the namespace part
 433          * @return string
 434          */
 435         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 436                 global $wgContLang;
 437
 438                 // First we check whether the namespace exists or not.
 439                 if ( MWNamespace::exists( $namespace ) ) {
 440                         if ( $namespace == NS_MAIN ) {
 441                                 $name = $context->msg( 'blanknamespace' )->text();
 442                         } else {
 443                                 $name = $wgContLang->getFormattedNsText( $namespace );
 444                         }
 445                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 446                 } else {
 447                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 448                 }
 449         }
 450
 451         /**
 452          * @param Title $title
 453          * @return Title
 454          */
 455         static function normaliseSpecialPage( Title $title ) {
 456                 if ( $title->isSpecialPage() ) {
 457                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 458                         if ( !$name ) {
 459                                 return $title;
 460                         }
 461                         $ret = SpecialPage::getTitleFor( $name, $subpage, $title->getFragment() );
 462                         return $ret;
 463                 } else {
 464                         return $title;
 465                 }
 466         }
 467
 468         /**
 469          * Returns the filename part of an url.
 470          * Used as alternative text for external images.
 471          *
 472          * @param string $url
 473          *
 474          * @return string
 475          */
 476         private static function fnamePart( $url ) {
 477                 $basename = strrchr( $url, '/' );
 478                 if ( false === $basename ) {
 479                         $basename = $url;
 480                 } else {
 481                         $basename = substr( $basename, 1 );
 482                 }
 483                 return $basename;
 484         }
 485
 486         /**
 487          * Return the code for images which were added via external links,
 488          * via Parser::maybeMakeExternalImage().
 489          *
 490          * @param string $url
 491          * @param string $alt
 492          *
 493          * @return string
 494          */
 495         public static function makeExternalImage( $url, $alt = '' ) {
 496                 if ( $alt == '' ) {
 497                         $alt = self::fnamePart( $url );
 498                 }
 499                 $img = '';
 500                 $success = wfRunHooks( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
 501                 if ( !$success ) {
 502                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 503                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 504                         return $img;
 505                 }
 506                 return Html::element( 'img',
 507                         array(
 508                                 'src' => $url,
 509                                 'alt' => $alt ) );
 510         }
 511
 512         /**
 513          * Given parameters derived from [[Image:Foo|options...]], generate the
 514          * HTML that that syntax inserts in the page.
 515          *
 516          * @param Parser $parser
 517          * @param Title $title Title object of the file (not the currently viewed page)
 518          * @param File $file File object, or false if it doesn't exist
 519          * @param array $frameParams Associative array of parameters external to the media handler.
 520          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 521          *     will often be false.
 522          *          thumbnail       If present, downscale and frame
 523          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 524          *          framed          Shows image in original size in a frame
 525          *          frameless       Downscale but don't frame
 526          *          upright         If present, tweak default sizes for portrait orientation
 527          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 528          *          border          If present, show a border around the image
 529          *          align           Horizontal alignment (left, right, center, none)
 530          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 531          *                          bottom, text-bottom)
 532          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 533          *          class           HTML for image classes. Plain text.
 534          *          caption         HTML for image caption.
 535          *          link-url        URL to link to
 536          *          link-title      Title object to link to
 537          *          link-target     Value for the target attribute, only with link-url
 538          *          no-link         Boolean, suppress description link
 539          *
 540          * @param array $handlerParams Associative array of media handler parameters, to be passed
 541          *       to transform(). Typical keys are "width" and "page".
 542          * @param string|bool $time Timestamp of the file, set as false for current
 543          * @param string $query Query params for desc url
 544          * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
 545          * @since 1.20
 546          * @return string HTML for an image, with links, wrappers, etc.
 547          */
 548         public static function makeImageLink( Parser $parser, Title $title,
 549                 $file, $frameParams = array(), $handlerParams = array(), $time = false,
 550                 $query = "", $widthOption = null
 551         ) {
 552                 $res = null;
 553                 $dummy = new DummyLinker;
 554                 if ( !wfRunHooks( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
 555                         &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
 556                         return $res;
 557                 }
 558
 559                 if ( $file && !$file->allowInlineDisplay() ) {
 560                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 561                         return self::link( $title );
 562                 }
 563
 564                 // Shortcuts
 565                 $fp =& $frameParams;
 566                 $hp =& $handlerParams;
 567
 568                 // Clean up parameters
 569                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 570                 if ( !isset( $fp['align'] ) ) {
 571                         $fp['align'] = '';
 572                 }
 573                 if ( !isset( $fp['alt'] ) ) {
 574                         $fp['alt'] = '';
 575                 }
 576                 if ( !isset( $fp['title'] ) ) {
 577                         $fp['title'] = '';
 578                 }
 579                 if ( !isset( $fp['class'] ) ) {
 580                         $fp['class'] = '';
 581                 }
 582
 583                 $prefix = $postfix = '';
 584
 585                 if ( 'center' == $fp['align'] ) {
 586                         $prefix = '<div class="center">';
 587                         $postfix = '</div>';
 588                         $fp['align'] = 'none';
 589                 }
 590                 if ( $file && !isset( $hp['width'] ) ) {
 591                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 592                                 // If its a vector image, and user only specifies height
 593                                 // we don't want it to be limited by its "normal" width.
 594                                 global $wgSVGMaxSize;
 595                                 $hp['width'] = $wgSVGMaxSize;
 596                         } else {
 597                                 $hp['width'] = $file->getWidth( $page );
 598                         }
 599
 600                         if ( isset( $fp['thumbnail'] )
 601                                 || isset( $fp['manualthumb'] )
 602                                 || isset( $fp['framed'] )
 603                                 || isset( $fp['frameless'] )
 604                                 || !$hp['width']
 605                         ) {
 606                                 global $wgThumbLimits, $wgThumbUpright;
 607
 608                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 609                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 610                                 }
 611
 612                                 // Reduce width for upright images when parameter 'upright' is used
 613                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 614                                         $fp['upright'] = $wgThumbUpright;
 615                                 }
 616
 617                                 // For caching health: If width scaled down due to upright
 618                                 // parameter, round to full __0 pixel to avoid the creation of a
 619                                 // lot of odd thumbs.
 620                                 $prefWidth = isset( $fp['upright'] ) ?
 621                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 622                                         $wgThumbLimits[$widthOption];
 623
 624                                 // Use width which is smaller: real image width or user preference width
 625                                 // Unless image is scalable vector.
 626                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 627                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 628                                         $hp['width'] = $prefWidth;
 629                                 }
 630                         }
 631                 }
 632
 633                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 634                         # Create a thumbnail. Alignment depends on the writing direction of
 635                         # the page content language (right-aligned for LTR languages,
 636                         # left-aligned for RTL languages)
 637                         #
 638                         # If a thumbnail width has not been provided, it is set
 639                         # to the default user option as specified in Language*.php
 640                         if ( $fp['align'] == '' ) {
 641                                 $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 642                         }
 643                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 644                 }
 645
 646                 if ( $file && isset( $fp['frameless'] ) ) {
 647                         $srcWidth = $file->getWidth( $page );
 648                         # For "frameless" option: do not present an image bigger than the
 649                         # source (for bitmap-style images). This is the same behavior as the
 650                         # "thumb" option does it already.
 651                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 652                                 $hp['width'] = $srcWidth;
 653                         }
 654                 }
 655
 656                 if ( $file && isset( $hp['width'] ) ) {
 657                         # Create a resized image, without the additional thumbnail features
 658                         $thumb = $file->transform( $hp );
 659                 } else {
 660                         $thumb = false;
 661                 }
 662
 663                 if ( !$thumb ) {
 664                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 665                 } else {
 666                         self::processResponsiveImages( $file, $thumb, $hp );
 667                         $params = array(
 668                                 'alt' => $fp['alt'],
 669                                 'title' => $fp['title'],
 670                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 671                                 'img-class' => $fp['class'] );
 672                         if ( isset( $fp['border'] ) ) {
 673                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 674                         }
 675                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 676
 677                         $s = $thumb->toHtml( $params );
 678                 }
 679                 if ( $fp['align'] != '' ) {
 680                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 681                 }
 682                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 683         }
 684
 685         /**
 686          * See makeImageLink()
 687          * When this function is removed, remove if( $parser instanceof Parser ) check there too
 688          * @deprecated since 1.20
 689          */
 690         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 691                 $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
 692                 return self::makeImageLink( null, $title, $file, $frameParams,
 693                         $handlerParams, $time, $query, $widthOption );
 694         }
 695
 696         /**
 697          * Get the link parameters for MediaTransformOutput::toHtml() from given
 698          * frame parameters supplied by the Parser.
 699          * @param array $frameParams The frame parameters
 700          * @param string $query An optional query string to add to description page links
 701          * @param Parser|null $parser
 702          * @return array
 703          */
 704         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 705                 $mtoParams = array();
 706                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 707                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 708                         if ( isset( $frameParams['link-target'] ) ) {
 709                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 710                         }
 711                         if ( $parser ) {
 712                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 713                                 foreach ( $extLinkAttrs as $name => $val ) {
 714                                         // Currently could include 'rel' and 'target'
 715                                         $mtoParams['parser-extlink-' . $name] = $val;
 716                                 }
 717                         }
 718                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 719                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 720                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 721                         // No link
 722                 } else {
 723                         $mtoParams['desc-link'] = true;
 724                         $mtoParams['desc-query'] = $query;
 725                 }
 726                 return $mtoParams;
 727         }
 728
 729         /**
 730          * Make HTML for a thumbnail including image, border and caption
 731          * @param Title $title
 732          * @param File|bool $file File object or false if it doesn't exist
 733          * @param string $label
 734          * @param string $alt
 735          * @param string $align
 736          * @param array $params
 737          * @param bool $framed
 738          * @param string $manualthumb
 739          * @return string
 740          */
 741         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 742                 $align = 'right', $params = array(), $framed = false, $manualthumb = ""
 743         ) {
 744                 $frameParams = array(
 745                         'alt' => $alt,
 746                         'caption' => $label,
 747                         'align' => $align
 748                 );
 749                 if ( $framed ) {
 750                         $frameParams['framed'] = true;
 751                 }
 752                 if ( $manualthumb ) {
 753                         $frameParams['manualthumb'] = $manualthumb;
 754                 }
 755                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 756         }
 757
 758         /**
 759          * @param Title $title
 760          * @param File $file
 761          * @param array $frameParams
 762          * @param array $handlerParams
 763          * @param bool $time
 764          * @param string $query
 765          * @return string
 766          */
 767         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 768                 $handlerParams = array(), $time = false, $query = ""
 769         ) {
 770                 $exists = $file && $file->exists();
 771
 772                 # Shortcuts
 773                 $fp =& $frameParams;
 774                 $hp =& $handlerParams;
 775
 776                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 777                 if ( !isset( $fp['align'] ) ) {
 778                         $fp['align'] = 'right';
 779                 }
 780                 if ( !isset( $fp['alt'] ) ) {
 781                         $fp['alt'] = '';
 782                 }
 783                 if ( !isset( $fp['title'] ) ) {
 784                         $fp['title'] = '';
 785                 }
 786                 if ( !isset( $fp['caption'] ) ) {
 787                         $fp['caption'] = '';
 788                 }
 789
 790                 if ( empty( $hp['width'] ) ) {
 791                         // Reduce width for upright images when parameter 'upright' is used
 792                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 793                 }
 794                 $thumb = false;
 795                 $noscale = false;
 796                 $manualthumb = false;
 797
 798                 if ( !$exists ) {
 799                         $outerWidth = $hp['width'] + 2;
 800                 } else {
 801                         if ( isset( $fp['manualthumb'] ) ) {
 802                                 # Use manually specified thumbnail
 803                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 804                                 if ( $manual_title ) {
 805                                         $manual_img = wfFindFile( $manual_title );
 806                                         if ( $manual_img ) {
 807                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 808                                                 $manualthumb = true;
 809                                         } else {
 810                                                 $exists = false;
 811                                         }
 812                                 }
 813                         } elseif ( isset( $fp['framed'] ) ) {
 814                                 // Use image dimensions, don't scale
 815                                 $thumb = $file->getUnscaledThumb( $hp );
 816                                 $noscale = true;
 817                         } else {
 818                                 # Do not present an image bigger than the source, for bitmap-style images
 819                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 820                                 $srcWidth = $file->getWidth( $page );
 821                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 822                                         $hp['width'] = $srcWidth;
 823                                 }
 824                                 $thumb = $file->transform( $hp );
 825                         }
 826
 827                         if ( $thumb ) {
 828                                 $outerWidth = $thumb->getWidth() + 2;
 829                         } else {
 830                                 $outerWidth = $hp['width'] + 2;
 831                         }
 832                 }
 833
 834                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 835                 # So we don't need to pass it here in $query. However, the URL for the
 836                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 837                 $url = $title->getLocalURL( $query );
 838                 if ( $page ) {
 839                         $url = wfAppendQuery( $url, array( 'page' => $page ) );
 840                 }
 841                 if ( $manualthumb
 842                         && !isset( $fp['link-title'] )
 843                         && !isset( $fp['link-url'] )
 844                         && !isset( $fp['no-link'] ) ) {
 845                         $fp['link-url'] = $url;
 846                 }
 847
 848                 $s = "<div class=\"thumb t{$fp['align']}\">"
 849                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 850
 851                 if ( !$exists ) {
 852                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 853                         $zoomIcon = '';
 854                 } elseif ( !$thumb ) {
 855                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 856                         $zoomIcon = '';
 857                 } else {
 858                         if ( !$noscale && !$manualthumb ) {
 859                                 self::processResponsiveImages( $file, $thumb, $hp );
 860                         }
 861                         $params = array(
 862                                 'alt' => $fp['alt'],
 863                                 'title' => $fp['title'],
 864                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
 865                                         ? $fp['class'] . ' '
 866                                         : '' ) . 'thumbimage'
 867                         );
 868                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 869                         $s .= $thumb->toHtml( $params );
 870                         if ( isset( $fp['framed'] ) ) {
 871                                 $zoomIcon = "";
 872                         } else {
 873                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 874                                         Html::rawElement( 'a', array(
 875                                                 'href' => $url,
 876                                                 'class' => 'internal',
 877                                                 'title' => wfMessage( 'thumbnail-more' )->text() ),
 878                                                 "" ) );
 879                         }
 880                 }
 881                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 882                 return str_replace( "\n", ' ', $s );
 883         }
 884
 885         /**
 886          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 887          * applicable.
 888          *
 889          * @param File $file
 890          * @param MediaTransformOutput $thumb
 891          * @param array $hp Image parameters
 892          */
 893         public static function processResponsiveImages( $file, $thumb, $hp ) {
 894                 global $wgResponsiveImages;
 895                 if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
 896                         $hp15 = $hp;
 897                         $hp15['width'] = round( $hp['width'] * 1.5 );
 898                         $hp20 = $hp;
 899                         $hp20['width'] = $hp['width'] * 2;
 900                         if ( isset( $hp['height'] ) ) {
 901                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 902                                 $hp20['height'] = $hp['height'] * 2;
 903                         }
 904
 905                         $thumb15 = $file->transform( $hp15 );
 906                         $thumb20 = $file->transform( $hp20 );
 907                         if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
 908                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 909                         }
 910                         if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
 911                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 912                         }
 913                 }
 914         }
 915
 916         /**
 917          * Make a "broken" link to an image
 918          *
 919          * @param Title $title
 920          * @param string $label Link label (plain text)
 921          * @param string $query Query string
 922          * @param string $unused1 Unused parameter kept for b/c
 923          * @param string $unused2 Unused parameter kept for b/c
 924          * @param bool $time A file of a certain timestamp was requested
 925          * @return string
 926          */
 927         public static function makeBrokenImageLinkObj( $title, $label = '',
 928                 $query = '', $unused1 = '', $unused2 = '', $time = false
 929         ) {
 930                 if ( !$title instanceof Title ) {
 931                         wfWarn( __METHOD__ . ': Requires $title to be a Title object.' );
 932                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 933                 }
 934
 935                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 936                 wfProfileIn( __METHOD__ );
 937                 if ( $label == '' ) {
 938                         $label = $title->getPrefixedText();
 939                 }
 940                 $encLabel = htmlspecialchars( $label );
 941                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 942
 943                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 944                         && !$currentExists
 945                 ) {
 946                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 947
 948                         if ( $redir ) {
 949                                 wfProfileOut( __METHOD__ );
 950                                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 951                         }
 952
 953                         $href = self::getUploadUrl( $title, $query );
 954
 955                         wfProfileOut( __METHOD__ );
 956                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 957                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 958                                 $encLabel . '</a>';
 959                 }
 960
 961                 wfProfileOut( __METHOD__ );
 962                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 963         }
 964
 965         /**
 966          * Get the URL to upload a certain file
 967          *
 968          * @param Title $destFile Title object of the file to upload
 969          * @param string $query Urlencoded query string to prepend
 970          * @return string Urlencoded URL
 971          */
 972         protected static function getUploadUrl( $destFile, $query = '' ) {
 973                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 974                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 975                 if ( $query != '' ) {
 976                         $q .= '&' . $query;
 977                 }
 978
 979                 if ( $wgUploadMissingFileUrl ) {
 980                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 981                 } elseif ( $wgUploadNavigationUrl ) {
 982                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 983                 } else {
 984                         $upload = SpecialPage::getTitleFor( 'Upload' );
 985                         return $upload->getLocalURL( $q );
 986                 }
 987         }
 988
 989         /**
 990          * Create a direct link to a given uploaded file.
 991          *
 992          * @param Title $title
 993          * @param string $html Pre-sanitized HTML
 994          * @param string $time MW timestamp of file creation time
 995          * @return string HTML
 996          */
 997         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 998                 $img = wfFindFile( $title, array( 'time' => $time ) );
 999                 return self::makeMediaLinkFile( $title, $img, $html );
1000         }
1001
1002         /**
1003          * Create a direct link to a given uploaded file.
1004          * This will make a broken link if $file is false.
1005          *
1006          * @param Title $title
1007          * @param File|bool $file File object or false
1008          * @param string $html Pre-sanitized HTML
1009          * @return string HTML
1010          *
1011          * @todo Handle invalid or missing images better.
1012          */
1013         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
1014                 if ( $file && $file->exists() ) {
1015                         $url = $file->getURL();
1016                         $class = 'internal';
1017                 } else {
1018                         $url = self::getUploadUrl( $title );
1019                         $class = 'new';
1020                 }
1021
1022                 $alt = $title->getText();
1023                 if ( $html == '' ) {
1024                         $html = $alt;
1025                 }
1026
1027                 $ret = '';
1028                 $attribs = array(
1029                         'href' => $url,
1030                         'class' => $class,
1031                         'title' => $alt
1032                 );
1033
1034                 if ( !wfRunHooks( 'LinkerMakeMediaLinkFile',
1035                         array( $title, $file, &$html, &$attribs, &$ret ) ) ) {
1036                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
1037                                 . "with url {$url} and text {$html} to {$ret}\n", true );
1038                         return $ret;
1039                 }
1040
1041                 return Html::rawElement( 'a', $attribs, $html );
1042         }
1043
1044         /**
1045          * Make a link to a special page given its name and, optionally,
1046          * a message key from the link text.
1047          * Usage example: Linker::specialLink( 'Recentchanges' )
1048          *
1049          * @param string $name
1050          * @param string $key
1051          * @return string
1052          */
1053         public static function specialLink( $name, $key = '' ) {
1054                 if ( $key == '' ) {
1055                         $key = strtolower( $name );
1056                 }
1057
1058                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
1059         }
1060
1061         /**
1062          * Make an external link
1063          * @param string $url URL to link to
1064          * @param string $text Text of link
1065          * @param bool $escape Do we escape the link text?
1066          * @param string $linktype Type of external link. Gets added to the classes
1067          * @param array $attribs Array of extra attributes to <a>
1068          * @param Title|null $title Title object used for title specific link attributes
1069          * @return string
1070          */
1071         public static function makeExternalLink( $url, $text, $escape = true,
1072                 $linktype = '', $attribs = array(), $title = null
1073         ) {
1074                 global $wgTitle;
1075                 $class = "external";
1076                 if ( $linktype ) {
1077                         $class .= " $linktype";
1078                 }
1079                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1080                         $class .= " {$attribs['class']}";
1081                 }
1082                 $attribs['class'] = $class;
1083
1084                 if ( $escape ) {
1085                         $text = htmlspecialchars( $text );
1086                 }
1087
1088                 if ( !$title ) {
1089                         $title = $wgTitle;
1090                 }
1091                 $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
1092                 $link = '';
1093                 $success = wfRunHooks( 'LinkerMakeExternalLink',
1094                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
1095                 if ( !$success ) {
1096                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
1097                                 . "with url {$url} and text {$text} to {$link}\n", true );
1098                         return $link;
1099                 }
1100                 $attribs['href'] = $url;
1101                 return Html::rawElement( 'a', $attribs, $text );
1102         }
1103
1104         /**
1105          * Make user link (or user contributions for unregistered users)
1106          * @param int $userId User id in database.
1107          * @param string $userName User name in database.
1108          * @param string $altUserName Text to display instead of the user name (optional)
1109          * @return string HTML fragment
1110          * @since 1.19 Method exists for a long time. $altUserName was added in 1.19.
1111          */
1112         public static function userLink( $userId, $userName, $altUserName = false ) {
1113                 $classes = 'mw-userlink';
1114                 if ( $userId == 0 ) {
1115                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1116                         if ( $altUserName === false ) {
1117                                 $altUserName = IP::prettifyIP( $userName );
1118                         }
1119                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
1120                 } else {
1121                         $page = Title::makeTitle( NS_USER, $userName );
1122                 }
1123
1124                 return self::link(
1125                         $page,
1126                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1127                         array( 'class' => $classes )
1128                 );
1129         }
1130
1131         /**
1132          * Generate standard user tool links (talk, contributions, block link, etc.)
1133          *
1134          * @param int $userId User identifier
1135          * @param string $userText User name or IP address
1136          * @param bool $redContribsWhenNoEdits Should the contributions link be
1137          *   red if the user has no edits?
1138          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
1139          *   and Linker::TOOL_LINKS_EMAIL).
1140          * @param int $edits User edit count (optional, for performance)
1141          * @return string HTML fragment
1142          */
1143         public static function userToolLinks(
1144                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1145         ) {
1146                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1147                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1148                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1149                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1150
1151                 $items = array();
1152                 if ( $talkable ) {
1153                         $items[] = self::userTalkLink( $userId, $userText );
1154                 }
1155                 if ( $userId ) {
1156                         // check if the user has an edit
1157                         $attribs = array();
1158                         if ( $redContribsWhenNoEdits ) {
1159                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1160                                         $user = User::newFromId( $userId );
1161                                         $edits = $user->getEditCount();
1162                                 }
1163                                 if ( $edits === 0 ) {
1164                                         $attribs['class'] = 'new';
1165                                 }
1166                         }
1167                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1168
1169                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1170                 }
1171                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1172                         $items[] = self::blockLink( $userId, $userText );
1173                 }
1174
1175                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1176                         $items[] = self::emailLink( $userId, $userText );
1177                 }
1178
1179                 wfRunHooks( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
1180
1181                 if ( $items ) {
1182                         return wfMessage( 'word-separator' )->plain()
1183                                 . '<span class="mw-usertoollinks">'
1184                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1185                                 . '</span>';
1186                 } else {
1187                         return '';
1188                 }
1189         }
1190
1191         /**
1192          * Alias for userToolLinks( $userId, $userText, true );
1193          * @param int $userId User identifier
1194          * @param string $userText User name or IP address
1195          * @param int $edits User edit count (optional, for performance)
1196          * @return string
1197          */
1198         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1199                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1200         }
1201
1202         /**
1203          * @param int $userId User id in database.
1204          * @param string $userText User name in database.
1205          * @return string HTML fragment with user talk link
1206          */
1207         public static function userTalkLink( $userId, $userText ) {
1208                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1209                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1210                 return $userTalkLink;
1211         }
1212
1213         /**
1214          * @param int $userId Userid
1215          * @param string $userText User name in database.
1216          * @return string HTML fragment with block link
1217          */
1218         public static function blockLink( $userId, $userText ) {
1219                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1220                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1221                 return $blockLink;
1222         }
1223
1224         /**
1225          * @param int $userId Userid
1226          * @param string $userText User name in database.
1227          * @return string HTML fragment with e-mail user link
1228          */
1229         public static function emailLink( $userId, $userText ) {
1230                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1231                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1232                 return $emailLink;
1233         }
1234
1235         /**
1236          * Generate a user link if the current user is allowed to view it
1237          * @param Revision $rev
1238          * @param bool $isPublic Show only if all users can see it
1239          * @return string HTML fragment
1240          */
1241         public static function revUserLink( $rev, $isPublic = false ) {
1242                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1243                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1244                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1245                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1246                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1247                 } else {
1248                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1249                 }
1250                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1251                         return '<span class="history-deleted">' . $link . '</span>';
1252                 }
1253                 return $link;
1254         }
1255
1256         /**
1257          * Generate a user tool link cluster if the current user is allowed to view it
1258          * @param Revision $rev
1259          * @param bool $isPublic Show only if all users can see it
1260          * @return string HTML
1261          */
1262         public static function revUserTools( $rev, $isPublic = false ) {
1263                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1264                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1265                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1266                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1267                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1268                         $link = self::userLink( $userId, $userText )
1269                                 . wfMessage( 'word-separator' )->plain()
1270                                 . self::userToolLinks( $userId, $userText );
1271                 } else {
1272                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1273                 }
1274                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1275                         return ' <span class="history-deleted">' . $link . '</span>';
1276                 }
1277                 return $link;
1278         }
1279
1280         /**
1281          * This function is called by all recent changes variants, by the page history,
1282          * and by the user contributions list. It is responsible for formatting edit
1283          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1284          * auto-generated comments (from section editing) and formats [[wikilinks]].
1285          *
1286          * @author Erik Moeller <moeller@scireview.de>
1287          *
1288          * Note: there's not always a title to pass to this function.
1289          * Since you can't set a default parameter for a reference, I've turned it
1290          * temporarily to a value pass. Should be adjusted further. --brion
1291          *
1292          * @param string $comment
1293          * @param Title|null $title Title object (to generate link to the section in autocomment) or null
1294          * @param bool $local Whether section links should refer to local page
1295          * @return mixed|string
1296          */
1297         public static function formatComment( $comment, $title = null, $local = false ) {
1298                 wfProfileIn( __METHOD__ );
1299
1300                 # Sanitize text a bit:
1301                 $comment = str_replace( "\n", " ", $comment );
1302                 # Allow HTML entities (for bug 13815)
1303                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1304
1305                 # Render autocomments and make links:
1306                 $comment = self::formatAutocomments( $comment, $title, $local );
1307                 $comment = self::formatLinksInComment( $comment, $title, $local );
1308
1309                 wfProfileOut( __METHOD__ );
1310                 return $comment;
1311         }
1312
1313         /**
1314          * Converts autogenerated comments in edit summaries into section links.
1315          * The pattern for autogen comments is / * foo * /, which makes for
1316          * some nasty regex.
1317          * We look for all comments, match any text before and after the comment,
1318          * add a separator where needed and format the comment itself with CSS
1319          * Called by Linker::formatComment.
1320          *
1321          * @param string $comment Comment text
1322          * @param Title|null $title An optional title object used to links to sections
1323          * @param bool $local Whether section links should refer to local page
1324          * @return string Formatted comment
1325          */
1326         private static function formatAutocomments( $comment, $title = null, $local = false ) {
1327                 return preg_replace_callback(
1328                         '!(.*)/\*\s*(.*?)\s*\*/(.*)!',
1329                         function ( $match ) use ( $title, $local ) {
1330                                 global $wgLang;
1331
1332                                 $pre = $match[1];
1333                                 $auto = $match[2];
1334                                 $post = $match[3];
1335                                 $comment = null;
1336                                 wfRunHooks( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local ) );
1337                                 if ( $comment === null ) {
1338                                         $link = '';
1339                                         if ( $title ) {
1340                                                 $section = $auto;
1341                                                 # Remove links that a user may have manually put in the autosummary
1342                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1343                                                 $section = str_replace( '[[:', '', $section );
1344                                                 $section = str_replace( '[[', '', $section );
1345                                                 $section = str_replace( ']]', '', $section );
1346
1347                                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1348                                                 if ( $local ) {
1349                                                         $sectionTitle = Title::newFromText( '#' . $section );
1350                                                 } else {
1351                                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1352                                                                 $title->getDBkey(), $section );
1353                                                 }
1354                                                 if ( $sectionTitle ) {
1355                                                         $link = Linker::link( $sectionTitle,
1356                                                                 $wgLang->getArrow(), array(), array(),
1357                                                                 'noclasses' );
1358                                                 } else {
1359                                                         $link = '';
1360                                                 }
1361                                         }
1362                                         if ( $pre ) {
1363                                                 # written summary $presep autocomment (summary /* section */)
1364                                                 $pre .= wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1365                                         }
1366                                         if ( $post ) {
1367                                                 # autocomment $postsep written summary (/* section */ summary)
1368                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1369                                         }
1370                                         $auto = '<span class="autocomment">' . $auto . '</span>';
1371                                         $comment = $pre . $link . $wgLang->getDirMark()
1372                                                 . '<span dir="auto">' . $auto . $post . '</span>';
1373                                 }
1374                                 return $comment;
1375                         },
1376                         $comment
1377                 );
1378         }
1379
1380         /**
1381          * Formats wiki links and media links in text; all other wiki formatting
1382          * is ignored
1383          *
1384          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1385          * @param string $comment Text to format links in
1386          * @param Title|null $title An optional title object used to links to sections
1387          * @param bool $local Whether section links should refer to local page
1388          * @return string
1389          */
1390         public static function formatLinksInComment( $comment, $title = null, $local = false ) {
1391                 return preg_replace_callback(
1392                         '/
1393                                 \[\[
1394                                 :? # ignore optional leading colon
1395                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1396                                 (?:\|
1397                                         # 2. a pipe-separated substring; only the last is captured
1398                                         # Stop matching at | and ]] without relying on backtracking.
1399                                         ((?:]?[^\]|])*+)
1400                                 )*
1401                                 \]\]
1402                                 ([^[]*) # 3. link trail (the text up until the next link)
1403                         /x',
1404                         function ( $match ) use ( $title, $local ) {
1405                                 global $wgContLang;
1406
1407                                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1408                                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1409
1410                                 $comment = $match[0];
1411
1412                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1413                                 if ( strpos( $match[1], '%' ) !== false ) {
1414                                         $match[1] = str_replace(
1415                                                 array( '<', '>' ),
1416                                                 array( '&lt;', '&gt;' ),
1417                                                 rawurldecode( $match[1] )
1418                                         );
1419                                 }
1420
1421                                 # Handle link renaming [[foo|text]] will show link as "text"
1422                                 if ( $match[2] != "" ) {
1423                                         $text = $match[2];
1424                                 } else {
1425                                         $text = $match[1];
1426                                 }
1427                                 $submatch = array();
1428                                 $thelink = null;
1429                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1430                                         # Media link; trail not supported.
1431                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1432                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1433                                         if ( $title ) {
1434                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1435                                         }
1436                                 } else {
1437                                         # Other kind of link
1438                                         if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
1439                                                 $trail = $submatch[1];
1440                                         } else {
1441                                                 $trail = "";
1442                                         }
1443                                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1444                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1445                                                 $match[1] = substr( $match[1], 1 );
1446                                         }
1447                                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1448
1449                                         $linkText = $text;
1450                                         $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1451
1452                                         $target = Title::newFromText( $linkTarget );
1453                                         if ( $target ) {
1454                                                 if ( $target->getText() == '' && !$target->isExternal()
1455                                                         && !$local && $title
1456                                                 ) {
1457                                                         $newTarget = clone ( $title );
1458                                                         $newTarget->setFragment( '#' . $target->getFragment() );
1459                                                         $target = $newTarget;
1460                                                 }
1461                                                 $thelink = Linker::link(
1462                                                         $target,
1463                                                         $linkText . $inside
1464                                                 ) . $trail;
1465                                         }
1466                                 }
1467                                 if ( $thelink ) {
1468                                         // If the link is still valid, go ahead and replace it in!
1469                                         $comment = preg_replace(
1470                                                 $linkRegexp,
1471                                                 StringUtils::escapeRegexReplacement( $thelink ),
1472                                                 $comment,
1473                                                 1
1474                                         );
1475                                 }
1476
1477                                 return $comment;
1478                         },
1479                         $comment
1480                 );
1481         }
1482
1483         /**
1484          * @param Title $contextTitle
1485          * @param string $target
1486          * @param string $text
1487          * @return string
1488          */
1489         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1490                 # Valid link forms:
1491                 # Foobar -- normal
1492                 # :Foobar -- override special treatment of prefix (images, language links)
1493                 # /Foobar -- convert to CurrentPage/Foobar
1494                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1495                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1496                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1497
1498                 wfProfileIn( __METHOD__ );
1499                 $ret = $target; # default return value is no change
1500
1501                 # Some namespaces don't allow subpages,
1502                 # so only perform processing if subpages are allowed
1503                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1504                         $hash = strpos( $target, '#' );
1505                         if ( $hash !== false ) {
1506                                 $suffix = substr( $target, $hash );
1507                                 $target = substr( $target, 0, $hash );
1508                         } else {
1509                                 $suffix = '';
1510                         }
1511                         # bug 7425
1512                         $target = trim( $target );
1513                         # Look at the first character
1514                         if ( $target != '' && $target[0] === '/' ) {
1515                                 # / at end means we don't want the slash to be shown
1516                                 $m = array();
1517                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1518                                 if ( $trailingSlashes ) {
1519                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1520                                 } else {
1521                                         $noslash = substr( $target, 1 );
1522                                 }
1523
1524                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1525                                 if ( $text === '' ) {
1526                                         $text = $target . $suffix;
1527                                 } # this might be changed for ugliness reasons
1528                         } else {
1529                                 # check for .. subpage backlinks
1530                                 $dotdotcount = 0;
1531                                 $nodotdot = $target;
1532                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1533                                         ++$dotdotcount;
1534                                         $nodotdot = substr( $nodotdot, 3 );
1535                                 }
1536                                 if ( $dotdotcount > 0 ) {
1537                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1538                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1539                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1540                                                 # / at the end means don't show full path
1541                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1542                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1543                                                         if ( $text === '' ) {
1544                                                                 $text = $nodotdot . $suffix;
1545                                                         }
1546                                                 }
1547                                                 $nodotdot = trim( $nodotdot );
1548                                                 if ( $nodotdot != '' ) {
1549                                                         $ret .= '/' . $nodotdot;
1550                                                 }
1551                                                 $ret .= $suffix;
1552                                         }
1553                                 }
1554                         }
1555                 }
1556
1557                 wfProfileOut( __METHOD__ );
1558                 return $ret;
1559         }
1560
1561         /**
1562          * Wrap a comment in standard punctuation and formatting if
1563          * it's non-empty, otherwise return empty string.
1564          *
1565          * @param string $comment
1566          * @param Title|null $title Title object (to generate link to section in autocomment) or null
1567          * @param bool $local Whether section links should refer to local page
1568          *
1569          * @return string
1570          */
1571         public static function commentBlock( $comment, $title = null, $local = false ) {
1572                 // '*' used to be the comment inserted by the software way back
1573                 // in antiquity in case none was provided, here for backwards
1574                 // compatibility, acc. to brion -ævar
1575                 if ( $comment == '' || $comment == '*' ) {
1576                         return '';
1577                 } else {
1578                         $formatted = self::formatComment( $comment, $title, $local );
1579                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1580                         return " <span class=\"comment\">$formatted</span>";
1581                 }
1582         }
1583
1584         /**
1585          * Wrap and format the given revision's comment block, if the current
1586          * user is allowed to view it.
1587          *
1588          * @param Revision $rev
1589          * @param bool $local Whether section links should refer to local page
1590          * @param bool $isPublic Show only if all users can see it
1591          * @return string HTML fragment
1592          */
1593         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1594                 if ( $rev->getRawComment() == "" ) {
1595                         return "";
1596                 }
1597                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1598                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1599                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1600                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1601                                 $rev->getTitle(), $local );
1602                 } else {
1603                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1604                 }
1605                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1606                         return " <span class=\"history-deleted\">$block</span>";
1607                 }
1608                 return $block;
1609         }
1610
1611         /**
1612          * @param int $size
1613          * @return string
1614          */
1615         public static function formatRevisionSize( $size ) {
1616                 if ( $size == 0 ) {
1617                         $stxt = wfMessage( 'historyempty' )->escaped();
1618                 } else {
1619                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1620                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1621                 }
1622                 return "<span class=\"history-size\">$stxt</span>";
1623         }
1624
1625         /**
1626          * Add another level to the Table of Contents
1627          *
1628          * @return string
1629          */
1630         public static function tocIndent() {
1631                 return "\n<ul>";
1632         }
1633
1634         /**
1635          * Finish one or more sublevels on the Table of Contents
1636          *
1637          * @param int $level
1638          * @return string
1639          */
1640         public static function tocUnindent( $level ) {
1641                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1642         }
1643
1644         /**
1645          * parameter level defines if we are on an indentation level
1646          *
1647          * @param string $anchor
1648          * @param string $tocline
1649          * @param string $tocnumber
1650          * @param string $level
1651          * @param string|bool $sectionIndex
1652          * @return string
1653          */
1654         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1655                 $classes = "toclevel-$level";
1656                 if ( $sectionIndex !== false ) {
1657                         $classes .= " tocsection-$sectionIndex";
1658                 }
1659                 return "\n<li class=\"$classes\"><a href=\"#" .
1660                         $anchor . '"><span class="tocnumber">' .
1661                         $tocnumber . '</span> <span class="toctext">' .
1662                         $tocline . '</span></a>';
1663         }
1664
1665         /**
1666          * End a Table Of Contents line.
1667          * tocUnindent() will be used instead if we're ending a line below
1668          * the new level.
1669          * @return string
1670          */
1671         public static function tocLineEnd() {
1672                 return "</li>\n";
1673         }
1674
1675         /**
1676          * Wraps the TOC in a table and provides the hide/collapse javascript.
1677          *
1678          * @param string $toc Html of the Table Of Contents
1679          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1680          * @return string Full html of the TOC
1681          */
1682         public static function tocList( $toc, $lang = false ) {
1683                 $lang = wfGetLangObj( $lang );
1684                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1685
1686                 return '<div id="toc" class="toc">'
1687                         . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1688                         . $toc
1689                         . "</ul>\n</div>\n";
1690         }
1691
1692         /**
1693          * Generate a table of contents from a section tree
1694          * Currently unused.
1695          *
1696          * @param array $tree Return value of ParserOutput::getSections()
1697          * @return string HTML fragment
1698          */
1699         public static function generateTOC( $tree ) {
1700                 $toc = '';
1701                 $lastLevel = 0;
1702                 foreach ( $tree as $section ) {
1703                         if ( $section['toclevel'] > $lastLevel ) {
1704                                 $toc .= self::tocIndent();
1705                         } elseif ( $section['toclevel'] < $lastLevel ) {
1706                                 $toc .= self::tocUnindent(
1707                                         $lastLevel - $section['toclevel'] );
1708                         } else {
1709                                 $toc .= self::tocLineEnd();
1710                         }
1711
1712                         $toc .= self::tocLine( $section['anchor'],
1713                                 $section['line'], $section['number'],
1714                                 $section['toclevel'], $section['index'] );
1715                         $lastLevel = $section['toclevel'];
1716                 }
1717                 $toc .= self::tocLineEnd();
1718                 return self::tocList( $toc );
1719         }
1720
1721         /**
1722          * Create a headline for content
1723          *
1724          * @param int $level The level of the headline (1-6)
1725          * @param string $attribs Any attributes for the headline, starting with
1726          *   a space and ending with '>'
1727          *   This *must* be at least '>' for no attribs
1728          * @param string $anchor The anchor to give the headline (the bit after the #)
1729          * @param string $html Html for the text of the header
1730          * @param string $link HTML to add for the section edit link
1731          * @param bool|string $legacyAnchor A second, optional anchor to give for
1732          *   backward compatibility (false to omit)
1733          *
1734          * @return string HTML headline
1735          */
1736         public static function makeHeadline( $level, $attribs, $anchor, $html,
1737                 $link, $legacyAnchor = false
1738         ) {
1739                 $ret = "<h$level$attribs"
1740                         . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1741                         . $link
1742                         . "</h$level>";
1743                 if ( $legacyAnchor !== false ) {
1744                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1745                 }
1746                 return $ret;
1747         }
1748
1749         /**
1750          * Split a link trail, return the "inside" portion and the remainder of the trail
1751          * as a two-element array
1752          * @param string $trail
1753          * @return array
1754          */
1755         static function splitTrail( $trail ) {
1756                 global $wgContLang;
1757                 $regex = $wgContLang->linkTrail();
1758                 $inside = '';
1759                 if ( $trail !== '' ) {
1760                         $m = array();
1761                         if ( preg_match( $regex, $trail, $m ) ) {
1762                                 $inside = $m[1];
1763                                 $trail = $m[2];
1764                         }
1765                 }
1766                 return array( $inside, $trail );
1767         }
1768
1769         /**
1770          * Generate a rollback link for a given revision.  Currently it's the
1771          * caller's responsibility to ensure that the revision is the top one. If
1772          * it's not, of course, the user will get an error message.
1773          *
1774          * If the calling page is called with the parameter &bot=1, all rollback
1775          * links also get that parameter. It causes the edit itself and the rollback
1776          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1777          * changes, so this allows sysops to combat a busy vandal without bothering
1778          * other users.
1779          *
1780          * If the option verify is set this function will return the link only in case the
1781          * revision can be reverted. Please note that due to performance limitations
1782          * it might be assumed that a user isn't the only contributor of a page while
1783          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1784          * work if $wgShowRollbackEditCount is disabled, so this can only function
1785          * as an additional check.
1786          *
1787          * If the option noBrackets is set the rollback link wont be enclosed in []
1788          *
1789          * @param Revision $rev
1790          * @param IContextSource $context Context to use or null for the main context.
1791          * @param array $options
1792          * @return string
1793          */
1794         public static function generateRollback( $rev, IContextSource $context = null,
1795                 $options = array( 'verify' )
1796         ) {
1797                 if ( $context === null ) {
1798                         $context = RequestContext::getMain();
1799                 }
1800
1801                 $editCount = false;
1802                 if ( in_array( 'verify', $options ) ) {
1803                         $editCount = self::getRollbackEditCount( $rev, true );
1804                         if ( $editCount === false ) {
1805                                 return '';
1806                         }
1807                 }
1808
1809                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1810
1811                 if ( !in_array( 'noBrackets', $options ) ) {
1812                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->plain();
1813                 }
1814
1815                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1816         }
1817
1818         /**
1819          * This function will return the number of revisions which a rollback
1820          * would revert and, if $verify is set it will verify that a revision
1821          * can be reverted (that the user isn't the only contributor and the
1822          * revision we might rollback to isn't deleted). These checks can only
1823          * function as an additional check as this function only checks against
1824          * the last $wgShowRollbackEditCount edits.
1825          *
1826          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1827          * is set and the user is the only contributor of the page.
1828          *
1829          * @param Revision $rev
1830          * @param bool $verify Try to verify that this revision can really be rolled back
1831          * @return int|bool|null
1832          */
1833         public static function getRollbackEditCount( $rev, $verify ) {
1834                 global $wgShowRollbackEditCount;
1835                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1836                         // Nothing has happened, indicate this by returning 'null'
1837                         return null;
1838                 }
1839
1840                 $dbr = wfGetDB( DB_SLAVE );
1841
1842                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1843                 $res = $dbr->select(
1844                         'revision',
1845                         array( 'rev_user_text', 'rev_deleted' ),
1846                         // $rev->getPage() returns null sometimes
1847                         array( 'rev_page' => $rev->getTitle()->getArticleID() ),
1848                         __METHOD__,
1849                         array(
1850                                 'USE INDEX' => array( 'revision' => 'page_timestamp' ),
1851                                 'ORDER BY' => 'rev_timestamp DESC',
1852                                 'LIMIT' => $wgShowRollbackEditCount + 1
1853                         )
1854                 );
1855
1856                 $editCount = 0;
1857                 $moreRevs = false;
1858                 foreach ( $res as $row ) {
1859                         if ( $rev->getRawUserText() != $row->rev_user_text ) {
1860                                 if ( $verify &&
1861                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1862                                                 || $row->rev_deleted & Revision::DELETED_USER
1863                                 ) ) {
1864                                         // If the user or the text of the revision we might rollback
1865                                         // to is deleted in some way we can't rollback. Similar to
1866                                         // the sanity checks in WikiPage::commitRollback.
1867                                         return false;
1868                                 }
1869                                 $moreRevs = true;
1870                                 break;
1871                         }
1872                         $editCount++;
1873                 }
1874
1875                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1876                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1877                         // and there weren't any other revisions. That means that the current user is the only
1878                         // editor, so we can't rollback
1879                         return false;
1880                 }
1881                 return $editCount;
1882         }
1883
1884         /**
1885          * Build a raw rollback link, useful for collections of "tool" links
1886          *
1887          * @param Revision $rev
1888          * @param IContextSource|null $context Context to use or null for the main context.
1889          * @param int $editCount Number of edits that would be reverted
1890          * @return string HTML fragment
1891          */
1892         public static function buildRollbackLink( $rev, IContextSource $context = null,
1893                 $editCount = false
1894         ) {
1895                 global $wgShowRollbackEditCount, $wgMiserMode;
1896
1897                 // To config which pages are effected by miser mode
1898                 $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );
1899
1900                 if ( $context === null ) {
1901                         $context = RequestContext::getMain();
1902                 }
1903
1904                 $title = $rev->getTitle();
1905                 $query = array(
1906                         'action' => 'rollback',
1907                         'from' => $rev->getUserText(),
1908                         'token' => $context->getUser()->getEditToken( array(
1909                                 $title->getPrefixedText(),
1910                                 $rev->getUserText()
1911                         ) ),
1912                 );
1913                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1914                         $query['bot'] = '1';
1915                         $query['hidediff'] = '1'; // bug 15999
1916                 }
1917
1918                 $disableRollbackEditCount = false;
1919                 if ( $wgMiserMode ) {
1920                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1921                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1922                                         $disableRollbackEditCount = true;
1923                                         break;
1924                                 }
1925                         }
1926                 }
1927
1928                 if ( !$disableRollbackEditCount
1929                         && is_int( $wgShowRollbackEditCount )
1930                         && $wgShowRollbackEditCount > 0
1931                 ) {
1932                         if ( !is_numeric( $editCount ) ) {
1933                                 $editCount = self::getRollbackEditCount( $rev, false );
1934                         }
1935
1936                         if ( $editCount > $wgShowRollbackEditCount ) {
1937                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
1938                                         ->numParams( $wgShowRollbackEditCount )->parse();
1939                         } else {
1940                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1941                         }
1942
1943                         return self::link(
1944                                 $title,
1945                                 $editCount_output,
1946                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1947                                 $query,
1948                                 array( 'known', 'noclasses' )
1949                         );
1950                 } else {
1951                         return self::link(
1952                                 $title,
1953                                 $context->msg( 'rollbacklink' )->escaped(),
1954                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1955                                 $query,
1956                                 array( 'known', 'noclasses' )
1957                         );
1958                 }
1959         }
1960
1961         /**
1962          * Returns HTML for the "templates used on this page" list.
1963          *
1964          * Make an HTML list of templates, and then add a "More..." link at
1965          * the bottom. If $more is null, do not add a "More..." link. If $more
1966          * is a Title, make a link to that title and use it. If $more is a string,
1967          * directly paste it in as the link (escaping needs to be done manually).
1968          * Finally, if $more is a Message, call toString().
1969          *
1970          * @param array $templates Array of templates from Article::getUsedTemplate or similar
1971          * @param bool $preview Whether this is for a preview
1972          * @param bool $section Whether this is for a section edit
1973          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
1974          * @return string HTML output
1975          */
1976         public static function formatTemplates( $templates, $preview = false,
1977                 $section = false, $more = null
1978         ) {
1979                 global $wgLang;
1980                 wfProfileIn( __METHOD__ );
1981
1982                 $outText = '';
1983                 if ( count( $templates ) > 0 ) {
1984                         # Do a batch existence check
1985                         $batch = new LinkBatch;
1986                         foreach ( $templates as $title ) {
1987                                 $batch->addObj( $title );
1988                         }
1989                         $batch->execute();
1990
1991                         # Construct the HTML
1992                         $outText = '<div class="mw-templatesUsedExplanation">';
1993                         if ( $preview ) {
1994                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
1995                                         ->parseAsBlock();
1996                         } elseif ( $section ) {
1997                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
1998                                         ->parseAsBlock();
1999                         } else {
2000                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
2001                                         ->parseAsBlock();
2002                         }
2003                         $outText .= "</div><ul>\n";
2004
2005                         usort( $templates, 'Title::compare' );
2006                         foreach ( $templates as $titleObj ) {
2007                                 $protected = '';
2008                                 $restrictions = $titleObj->getRestrictions( 'edit' );
2009                                 if ( $restrictions ) {
2010                                         // Check backwards-compatible messages
2011                                         $msg = null;
2012                                         if ( $restrictions === array( 'sysop' ) ) {
2013                                                 $msg = wfMessage( 'template-protected' );
2014                                         } elseif ( $restrictions === array( 'autoconfirmed' ) ) {
2015                                                 $msg = wfMessage( 'template-semiprotected' );
2016                                         }
2017                                         if ( $msg && !$msg->isDisabled() ) {
2018                                                 $protected = $msg->parse();
2019                                         } else {
2020                                                 // Construct the message from restriction-level-*
2021                                                 // e.g. restriction-level-sysop, restriction-level-autoconfirmed
2022                                                 $msgs = array();
2023                                                 foreach ( $restrictions as $r ) {
2024                                                         $msgs[] = wfMessage( "restriction-level-$r" )->parse();
2025                                                 }
2026                                                 $protected = wfMessage( 'parentheses' )
2027                                                         ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
2028                                         }
2029                                 }
2030                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
2031                                         $editLink = self::link(
2032                                                 $titleObj,
2033                                                 wfMessage( 'editlink' )->text(),
2034                                                 array(),
2035                                                 array( 'action' => 'edit' )
2036                                         );
2037                                 } else {
2038                                         $editLink = self::link(
2039                                                 $titleObj,
2040                                                 wfMessage( 'viewsourcelink' )->text(),
2041                                                 array(),
2042                                                 array( 'action' => 'edit' )
2043                                         );
2044                                 }
2045                                 $outText .= '<li>' . self::link( $titleObj )
2046                                         . wfMessage( 'word-separator' )->escaped()
2047                                         . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
2048                                         . wfMessage( 'word-separator' )->escaped()
2049                                         . $protected . '</li>';
2050                         }
2051
2052                         if ( $more instanceof Title ) {
2053                                 $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
2054                         } elseif ( $more ) {
2055                                 $outText .= "<li>$more</li>";
2056                         }
2057
2058                         $outText .= '</ul>';
2059                 }
2060                 wfProfileOut( __METHOD__ );
2061                 return $outText;
2062         }
2063
2064         /**
2065          * Returns HTML for the "hidden categories on this page" list.
2066          *
2067          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
2068          *   or similar
2069          * @return string HTML output
2070          */
2071         public static function formatHiddenCategories( $hiddencats ) {
2072                 wfProfileIn( __METHOD__ );
2073
2074                 $outText = '';
2075                 if ( count( $hiddencats ) > 0 ) {
2076                         # Construct the HTML
2077                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
2078                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
2079                         $outText .= "</div><ul>\n";
2080
2081                         foreach ( $hiddencats as $titleObj ) {
2082                                 # If it's hidden, it must exist - no need to check with a LinkBatch
2083                                 $outText .= '<li>'
2084                                         . self::link( $titleObj, null, array(), array(), 'known' )
2085                                         . "</li>\n";
2086                         }
2087                         $outText .= '</ul>';
2088                 }
2089                 wfProfileOut( __METHOD__ );
2090                 return $outText;
2091         }
2092
2093         /**
2094          * Format a size in bytes for output, using an appropriate
2095          * unit (B, KB, MB or GB) according to the magnitude in question
2096          *
2097          * @param int $size Size to format
2098          * @return string
2099          */
2100         public static function formatSize( $size ) {
2101                 global $wgLang;
2102                 return htmlspecialchars( $wgLang->formatSize( $size ) );
2103         }
2104
2105         /**
2106          * Given the id of an interface element, constructs the appropriate title
2107          * attribute from the system messages.  (Note, this is usually the id but
2108          * isn't always, because sometimes the accesskey needs to go on a different
2109          * element than the id, for reverse-compatibility, etc.)
2110          *
2111          * @param string $name Id of the element, minus prefixes.
2112          * @param string|null $options Null or the string 'withaccess' to add an access-
2113          *   key hint
2114          * @return string Contents of the title attribute (which you must HTML-
2115          *   escape), or false for no title attribute
2116          */
2117         public static function titleAttrib( $name, $options = null ) {
2118                 wfProfileIn( __METHOD__ );
2119
2120                 $message = wfMessage( "tooltip-$name" );
2121
2122                 if ( !$message->exists() ) {
2123                         $tooltip = false;
2124                 } else {
2125                         $tooltip = $message->text();
2126                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2127                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2128                         # Message equal to '-' means suppress it.
2129                         if ( $tooltip == '-' ) {
2130                                 $tooltip = false;
2131                         }
2132                 }
2133
2134                 if ( $options == 'withaccess' ) {
2135                         $accesskey = self::accesskey( $name );
2136                         if ( $accesskey !== false ) {
2137                                 // Should be build the same as in jquery.accessKeyLabel.js
2138                                 if ( $tooltip === false || $tooltip === '' ) {
2139                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2140                                 } else {
2141                                         $tooltip .= wfMessage( 'word-separator' )->text();
2142                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2143                                 }
2144                         }
2145                 }
2146
2147                 wfProfileOut( __METHOD__ );
2148                 return $tooltip;
2149         }
2150
2151         public static $accesskeycache;
2152
2153         /**
2154          * Given the id of an interface element, constructs the appropriate
2155          * accesskey attribute from the system messages.  (Note, this is usually
2156          * the id but isn't always, because sometimes the accesskey needs to go on
2157          * a different element than the id, for reverse-compatibility, etc.)
2158          *
2159          * @param string $name Id of the element, minus prefixes.
2160          * @return string Contents of the accesskey attribute (which you must HTML-
2161          *   escape), or false for no accesskey attribute
2162          */
2163         public static function accesskey( $name ) {
2164                 if ( isset( self::$accesskeycache[$name] ) ) {
2165                         return self::$accesskeycache[$name];
2166                 }
2167                 wfProfileIn( __METHOD__ );
2168
2169                 $message = wfMessage( "accesskey-$name" );
2170
2171                 if ( !$message->exists() ) {
2172                         $accesskey = false;
2173                 } else {
2174                         $accesskey = $message->plain();
2175                         if ( $accesskey === '' || $accesskey === '-' ) {
2176                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2177                                 # attribute, but this is broken for accesskey: that might be a useful
2178                                 # value.
2179                                 $accesskey = false;
2180                         }
2181                 }
2182
2183                 wfProfileOut( __METHOD__ );
2184                 self::$accesskeycache[$name] = $accesskey;
2185                 return self::$accesskeycache[$name];
2186         }
2187
2188         /**
2189          * Get a revision-deletion link, or disabled link, or nothing, depending
2190          * on user permissions & the settings on the revision.
2191          *
2192          * Will use forward-compatible revision ID in the Special:RevDelete link
2193          * if possible, otherwise the timestamp-based ID which may break after
2194          * undeletion.
2195          *
2196          * @param User $user
2197          * @param Revision $rev
2198          * @param Title $title
2199          * @return string HTML fragment
2200          */
2201         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2202                 $canHide = $user->isAllowed( 'deleterevision' );
2203                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2204                         return '';
2205                 }
2206
2207                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2208                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2209                 } else {
2210                         if ( $rev->getId() ) {
2211                                 // RevDelete links using revision ID are stable across
2212                                 // page deletion and undeletion; use when possible.
2213                                 $query = array(
2214                                         'type' => 'revision',
2215                                         'target' => $title->getPrefixedDBkey(),
2216                                         'ids' => $rev->getId()
2217                                 );
2218                         } else {
2219                                 // Older deleted entries didn't save a revision ID.
2220                                 // We have to refer to these by timestamp, ick!
2221                                 $query = array(
2222                                         'type' => 'archive',
2223                                         'target' => $title->getPrefixedDBkey(),
2224                                         'ids' => $rev->getTimestamp()
2225                                 );
2226                         }
2227                         return Linker::revDeleteLink( $query,
2228                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2229                 }
2230         }
2231
2232         /**
2233          * Creates a (show/hide) link for deleting revisions/log entries
2234          *
2235          * @param array $query Query parameters to be passed to link()
2236          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2237          * @param bool $delete Set to true to use (show/hide) rather than (show)
2238          *
2239          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2240          * span to allow for customization of appearance with CSS
2241          */
2242         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
2243                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2244                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2245                 $html = wfMessage( $msgKey )->escaped();
2246                 $tag = $restricted ? 'strong' : 'span';
2247                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
2248                 return Xml::tags(
2249                         $tag,
2250                         array( 'class' => 'mw-revdelundel-link' ),
2251                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2252                 );
2253         }
2254
2255         /**
2256          * Creates a dead (show/hide) link for deleting revisions/log entries
2257          *
2258          * @param bool $delete Set to true to use (show/hide) rather than (show)
2259          *
2260          * @return string HTML text wrapped in a span to allow for customization
2261          * of appearance with CSS
2262          */
2263         public static function revDeleteLinkDisabled( $delete = true ) {
2264                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2265                 $html = wfMessage( $msgKey )->escaped();
2266                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2267                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
2268         }
2269
2270         /* Deprecated methods */
2271
2272         /**
2273          * @deprecated since 1.16 Use link(); warnings since 1.21
2274          *
2275          * Make a link for a title which may or may not be in the database. If you need to
2276          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
2277          * call to this will result in a DB query.
2278          *
2279          * @param Title $nt The title object to make the link from, e.g. from Title::newFromText.
2280          * @param string $text Link text
2281          * @param string $query Optional query part
2282          * @param string $trail Optional trail. Alphabetic characters at the start of this string will
2283          *   be included in the link text. Other characters will be appended after
2284          *   the end of the link.
2285          * @param string $prefix Optional prefix. As trail, only before instead of after.
2286          * @return string
2287          */
2288         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2289                 wfDeprecated( __METHOD__, '1.21' );
2290
2291                 wfProfileIn( __METHOD__ );
2292                 $query = wfCgiToArray( $query );
2293                 list( $inside, $trail ) = self::splitTrail( $trail );
2294                 if ( $text === '' ) {
2295                         $text = self::linkText( $nt );
2296                 }
2297
2298                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
2299
2300                 wfProfileOut( __METHOD__ );
2301                 return $ret;
2302         }
2303
2304         /**
2305          * @deprecated since 1.16 Use link(); warnings since 1.21
2306          *
2307          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
2308          * it doesn't have to do a database query. It's also valid for interwiki titles and special
2309          * pages.
2310          *
2311          * @param Title $title Title object of target page
2312          * @param string $text Text to replace the title
2313          * @param string $query Link target
2314          * @param string $trail Text after link
2315          * @param string $prefix Text before link text
2316          * @param string $aprops Extra attributes to the a-element
2317          * @param string $style Style to apply - if empty, use getInternalLinkAttributesObj instead
2318          * @return string The a-element
2319          */
2320         static function makeKnownLinkObj(
2321                 $title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
2322         ) {
2323                 wfDeprecated( __METHOD__, '1.21' );
2324
2325                 wfProfileIn( __METHOD__ );
2326
2327                 if ( $text == '' ) {
2328                         $text = self::linkText( $title );
2329                 }
2330                 $attribs = Sanitizer::mergeAttributes(
2331                         Sanitizer::decodeTagAttributes( $aprops ),
2332                         Sanitizer::decodeTagAttributes( $style )
2333                 );
2334                 $query = wfCgiToArray( $query );
2335                 list( $inside, $trail ) = self::splitTrail( $trail );
2336
2337                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
2338                         array( 'known', 'noclasses' ) ) . $trail;
2339
2340                 wfProfileOut( __METHOD__ );
2341                 return $ret;
2342         }
2343
2344         /**
2345          * Returns the attributes for the tooltip and access key.
2346          * @param string $name
2347          * @return array
2348          */
2349         public static function tooltipAndAccesskeyAttribs( $name ) {
2350                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2351                 # no attribute" instead of "output '' as value for attribute", this
2352                 # would be three lines.
2353                 $attribs = array(
2354                         'title' => self::titleAttrib( $name, 'withaccess' ),
2355                         'accesskey' => self::accesskey( $name )
2356                 );
2357                 if ( $attribs['title'] === false ) {
2358                         unset( $attribs['title'] );
2359                 }
2360                 if ( $attribs['accesskey'] === false ) {
2361                         unset( $attribs['accesskey'] );
2362                 }
2363                 return $attribs;
2364         }
2365
2366         /**
2367          * Returns raw bits of HTML, use titleAttrib()
2368          * @param string $name
2369          * @param array|null $options
2370          * @return null|string
2371          */
2372         public static function tooltip( $name, $options = null ) {
2373                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2374                 # no attribute" instead of "output '' as value for attribute", this
2375                 # would be two lines.
2376                 $tooltip = self::titleAttrib( $name, $options );
2377                 if ( $tooltip === false ) {
2378                         return '';
2379                 }
2380                 return Xml::expandAttributes( array(
2381                         'title' => $tooltip
2382                 ) );
2383         }
2384 }
2385
2386 /**
2387  * @since 1.18
2388  */
2389 class DummyLinker {
2390
2391         /**
2392          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2393          * into static calls to the new Linker for backwards compatibility.
2394          *
2395          * @param string $fname Name of called method
2396          * @param array $args Arguments to the method
2397          * @return mixed
2398          */
2399         public function __call( $fname, $args ) {
2400                 return call_user_func_array( array( 'Linker', $fname ), $args );
2401         }
2402 }