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