includes/Linker.php

   1 <?php
   2 /**
   3  * Methods to make links and related items.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Some internal bits split of from Skin.php. These functions are used
  25  * for primarily page content: links, embedded images, table of contents. Links
  26  * are also used in the skin.
  27  *
  28  * @ingroup Skins
  29  */
  30 class Linker {
  31
  32         /**
  33          * Flags for userToolLinks()
  34          */
  35         const TOOL_LINKS_NOBLOCK = 1;
  36         const TOOL_LINKS_EMAIL = 2;
  37
  38         /**
  39          * Get the appropriate HTML attributes to add to the "a" element of an
  40          * external link, as created by [wikisyntax].
  41          *
  42          * @param string $class the contents of the class attribute; if an empty
  43          *   string is passed, which is the default value, defaults to 'external'.
  44          * @return string
  45          * @deprecated since 1.18 Just pass the external class directly to something using Html::expandAttributes
  46          */
  47         static function getExternalLinkAttributes( $class = 'external' ) {
  48                 wfDeprecated( __METHOD__, '1.18' );
  49                 return self::getLinkAttributesInternal( '', $class );
  50         }
  51
  52         /**
  53          * Get the appropriate HTML attributes to add to the "a" element of an interwiki link.
  54          *
  55          * @param string $title the title text for the link, URL-encoded (???) but
  56          *   not HTML-escaped
  57          * @param string $unused unused
  58          * @param string $class the contents of the class attribute; if an empty
  59          *   string is passed, which is the default value, defaults to 'external'.
  60          * @return string
  61          */
  62         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  63                 global $wgContLang;
  64
  65                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  66                 # getExternalLinkAttributes, why?
  67                 $title = urldecode( $title );
  68                 $title = $wgContLang->checkTitleEncoding( $title );
  69                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  70
  71                 return self::getLinkAttributesInternal( $title, $class );
  72         }
  73
  74         /**
  75          * Get the appropriate HTML attributes to add to the "a" element of an internal link.
  76          *
  77          * @param string $title the title text for the link, URL-encoded (???) but
  78          *   not HTML-escaped
  79          * @param string $unused unused
  80          * @param string $class the contents of the class attribute, default none
  81          * @return string
  82          */
  83         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  84                 $title = urldecode( $title );
  85                 $title = str_replace( '_', ' ', $title );
  86                 return self::getLinkAttributesInternal( $title, $class );
  87         }
  88
  89         /**
  90          * Get the appropriate HTML attributes to add to the "a" element of an internal
  91          * link, given the Title object for the page we want to link to.
  92          *
  93          * @param $nt Title
  94          * @param string $unused unused
  95          * @param string $class the contents of the class attribute, default none
  96          * @param $title Mixed: optional (unescaped) string to use in the title
  97          *   attribute; if false, default to the name of the page we're linking to
  98          * @return string
  99          */
 100         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
 101                 if ( $title === false ) {
 102                         $title = $nt->getPrefixedText();
 103                 }
 104                 return self::getLinkAttributesInternal( $title, $class );
 105         }
 106
 107         /**
 108          * Common code for getLinkAttributesX functions
 109          *
 110          * @param $title string
 111          * @param $class string
 112          *
 113          * @return string
 114          */
 115         private static function getLinkAttributesInternal( $title, $class ) {
 116                 $title = htmlspecialchars( $title );
 117                 $class = htmlspecialchars( $class );
 118                 $r = '';
 119                 if ( $class != '' ) {
 120                         $r .= " class=\"$class\"";
 121                 }
 122                 if ( $title != '' ) {
 123                         $r .= " title=\"$title\"";
 124                 }
 125                 return $r;
 126         }
 127
 128         /**
 129          * Return the CSS colour of a known link
 130          *
 131          * @param $t Title object
 132          * @param $threshold Integer: user defined threshold
 133          * @return String: CSS class
 134          */
 135         public static function getLinkColour( $t, $threshold ) {
 136                 $colour = '';
 137                 if ( $t->isRedirect() ) {
 138                         # Page is a redirect
 139                         $colour = 'mw-redirect';
 140                 } elseif ( $threshold > 0 && $t->isContentPage() &&
 141                         $t->exists() && $t->getLength() < $threshold
 142                 ) {
 143                         # Page is a stub
 144                         $colour = 'stub';
 145                 }
 146                 return $colour;
 147         }
 148
 149         /**
 150          * This function returns an HTML link to the given target.  It serves a few
 151          * purposes:
 152          *   1) If $target is a Title, the correct URL to link to will be figured
 153          *      out automatically.
 154          *   2) It automatically adds the usual classes for various types of link
 155          *      targets: "new" for red links, "stub" for short articles, etc.
 156          *   3) It escapes all attribute values safely so there's no risk of XSS.
 157          *   4) It provides a default tooltip if the target is a Title (the page
 158          *      name of the target).
 159          * link() replaces the old functions in the makeLink() family.
 160          *
 161          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 162          * You can call it using this if you want to keep compat with these:
 163          * $linker = class_exists( 'DummyLinker' ) ? new DummyLinker() : new Linker();
 164          * $linker->link( ... );
 165          *
 166          * @param $target        Title  Can currently only be a Title, but this may
 167          *   change to support Images, literal URLs, etc.
 168          * @param $html          string 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 $query         array  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(), $options = array()
 195         ) {
 196                 wfProfileIn( __METHOD__ );
 197                 if ( !$target instanceof Title ) {
 198                         wfProfileOut( __METHOD__ );
 199                         return "<!-- ERROR -->$html";
 200                 }
 201
 202                 if ( is_string( $query ) ) {
 203                         // some functions withing core using this still hand over query strings
 204                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
 205                         $query = wfCgiToArray( $query );
 206                 }
 207                 $options = (array)$options;
 208
 209                 $dummy = new DummyLinker; // dummy linker instance for bc on the hooks
 210
 211                 $ret = null;
 212                 if ( !wfRunHooks( 'LinkBegin', array( $dummy, $target, &$html,
 213                 &$customAttribs, &$query, &$options, &$ret ) ) ) {
 214                         wfProfileOut( __METHOD__ );
 215                         return $ret;
 216                 }
 217
 218                 # Normalize the Title if it's a special page
 219                 $target = self::normaliseSpecialPage( $target );
 220
 221                 # If we don't know whether the page exists, let's find out.
 222                 wfProfileIn( __METHOD__ . '-checkPageExistence' );
 223                 if ( !in_array( 'known', $options ) and !in_array( 'broken', $options ) ) {
 224                         if ( $target->isKnown() ) {
 225                                 $options[] = 'known';
 226                         } else {
 227                                 $options[] = 'broken';
 228                         }
 229                 }
 230                 wfProfileOut( __METHOD__ . '-checkPageExistence' );
 231
 232                 $oldquery = array();
 233                 if ( in_array( "forcearticlepath", $options ) && $query ) {
 234                         $oldquery = $query;
 235                         $query = array();
 236                 }
 237
 238                 # Note: we want the href attribute first, for prettiness.
 239                 $attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
 240                 if ( in_array( 'forcearticlepath', $options ) && $oldquery ) {
 241                         $attribs['href'] = wfAppendQuery( $attribs['href'], $oldquery );
 242                 }
 243
 244                 $attribs = array_merge(
 245                         $attribs,
 246                         self::linkAttribs( $target, $customAttribs, $options )
 247                 );
 248                 if ( is_null( $html ) ) {
 249                         $html = self::linkText( $target );
 250                 }
 251
 252                 $ret = null;
 253                 if ( wfRunHooks( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
 254                         $ret = Html::rawElement( 'a', $attribs, $html );
 255                 }
 256
 257                 wfProfileOut( __METHOD__ );
 258                 return $ret;
 259         }
 260
 261         /**
 262          * Identical to link(), except $options defaults to 'known'.
 263          * @return string
 264          */
 265         public static function linkKnown(
 266                 $target, $html = null, $customAttribs = array(),
 267                 $query = array(), $options = array( 'known', 'noclasses' )
 268         ) {
 269                 return self::link( $target, $html, $customAttribs, $query, $options );
 270         }
 271
 272         /**
 273          * Returns the Url used to link to a Title
 274          *
 275          * @param $target Title
 276          * @param array $query query parameters
 277          * @param $options Array
 278          * @return String
 279          */
 280         private static function linkUrl( $target, $query, $options ) {
 281                 wfProfileIn( __METHOD__ );
 282                 # We don't want to include fragments for broken links, because they
 283                 # generally make no sense.
 284                 if ( in_array( 'broken', $options ) && $target->mFragment !== '' ) {
 285                         $target = clone $target;
 286                         $target->mFragment = '';
 287                 }
 288
 289                 # If it's a broken link, add the appropriate query pieces, unless
 290                 # there's already an action specified, or unless 'edit' makes no sense
 291                 # (i.e., for a nonexistent special page).
 292                 if ( in_array( 'broken', $options ) && empty( $query['action'] )
 293                         && !$target->isSpecialPage() ) {
 294                         $query['action'] = 'edit';
 295                         $query['redlink'] = '1';
 296                 }
 297
 298                 if ( in_array( 'http', $options ) ) {
 299                         $proto = PROTO_HTTP;
 300                 } elseif ( in_array( 'https', $options ) ) {
 301                         $proto = PROTO_HTTPS;
 302                 } else {
 303                         $proto = PROTO_RELATIVE;
 304                 }
 305
 306                 $ret = $target->getLinkURL( $query, false, $proto );
 307                 wfProfileOut( __METHOD__ );
 308                 return $ret;
 309         }
 310
 311         /**
 312          * Returns the array of attributes used when linking to the Title $target
 313          *
 314          * @param $target Title
 315          * @param $attribs
 316          * @param $options
 317          *
 318          * @return array
 319          */
 320         private static function linkAttribs( $target, $attribs, $options ) {
 321                 wfProfileIn( __METHOD__ );
 322                 global $wgUser;
 323                 $defaults = array();
 324
 325                 if ( !in_array( 'noclasses', $options ) ) {
 326                         wfProfileIn( __METHOD__ . '-getClasses' );
 327                         # Now build the classes.
 328                         $classes = array();
 329
 330                         if ( in_array( 'broken', $options ) ) {
 331                                 $classes[] = 'new';
 332                         }
 333
 334                         if ( $target->isExternal() ) {
 335                                 $classes[] = 'extiw';
 336                         }
 337
 338                         if ( !in_array( 'broken', $options ) ) { # Avoid useless calls to LinkCache (see r50387)
 339                                 $colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
 340                                 if ( $colour !== '' ) {
 341                                         $classes[] = $colour; # mw-redirect or stub
 342                                 }
 343                         }
 344                         if ( $classes != array() ) {
 345                                 $defaults['class'] = implode( ' ', $classes );
 346                         }
 347                         wfProfileOut( __METHOD__ . '-getClasses' );
 348                 }
 349
 350                 # Get a default title attribute.
 351                 if ( $target->getPrefixedText() == '' ) {
 352                         # A link like [[#Foo]].  This used to mean an empty title
 353                         # attribute, but that's silly.  Just don't output a title.
 354                 } elseif ( in_array( 'known', $options ) ) {
 355                         $defaults['title'] = $target->getPrefixedText();
 356                 } else {
 357                         $defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )->text();
 358                 }
 359
 360                 # Finally, merge the custom attribs with the default ones, and iterate
 361                 # over that, deleting all "false" attributes.
 362                 $ret = array();
 363                 $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
 364                 foreach ( $merged as $key => $val ) {
 365                         # A false value suppresses the attribute, and we don't want the
 366                         # href attribute to be overridden.
 367                         if ( $key != 'href' and $val !== false ) {
 368                                 $ret[$key] = $val;
 369                         }
 370                 }
 371                 wfProfileOut( __METHOD__ );
 372                 return $ret;
 373         }
 374
 375         /**
 376          * Default text of the links to the Title $target
 377          *
 378          * @param $target Title
 379          *
 380          * @return string
 381          */
 382         private static function linkText( $target ) {
 383                 // We might be passed a non-Title by make*LinkObj().  Fail gracefully.
 384                 if ( !$target instanceof Title ) {
 385                         return '';
 386                 }
 387
 388                 // If the target is just a fragment, with no title, we return the fragment
 389                 // text.  Otherwise, we return the title text itself.
 390                 if ( $target->getPrefixedText() === '' && $target->getFragment() !== '' ) {
 391                         return htmlspecialchars( $target->getFragment() );
 392                 }
 393                 return htmlspecialchars( $target->getPrefixedText() );
 394         }
 395
 396         /**
 397          * Generate either a normal exists-style link or a stub link, depending
 398          * on the given page size.
 399          *
 400          * @param $size Integer
 401          * @param $nt Title object.
 402          * @param $text String
 403          * @param $query String
 404          * @param $trail String
 405          * @param $prefix String
 406          * @return string HTML of link
 407          * @deprecated since 1.17
 408          */
 409         static function makeSizeLinkObj( $size, $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
 410                 global $wgUser;
 411                 wfDeprecated( __METHOD__, '1.17' );
 412
 413                 $threshold = $wgUser->getStubThreshold();
 414                 $colour = ( $size < $threshold ) ? 'stub' : '';
 415                 // @todo FIXME: Replace deprecated makeColouredLinkObj by link()
 416                 return self::makeColouredLinkObj( $nt, $colour, $text, $query, $trail, $prefix );
 417         }
 418
 419         /**
 420          * Make appropriate markup for a link to the current article. This is currently rendered
 421          * as the bold link text. The calling sequence is the same as the other make*LinkObj static functions,
 422          * despite $query not being used.
 423          *
 424          * @param $nt Title
 425          * @param string $html [optional]
 426          * @param string $query [optional]
 427          * @param string $trail [optional]
 428          * @param string $prefix [optional]
 429          *
 430          *
 431          * @return string
 432          */
 433         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 434                 if ( $html == '' ) {
 435                         $html = htmlspecialchars( $nt->getPrefixedText() );
 436                 }
 437                 list( $inside, $trail ) = self::splitTrail( $trail );
 438                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 439         }
 440
 441         /**
 442          * Get a message saying that an invalid title was encountered.
 443          * This should be called after a method like Title::makeTitleSafe() returned
 444          * a value indicating that the title object is invalid.
 445          *
 446          * @param $context IContextSource context to use to get the messages
 447          * @param int $namespace Namespace number
 448          * @param string $title Text of the title, without the namespace part
 449          * @return string
 450          */
 451         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 452                 global $wgContLang;
 453
 454                 // First we check whether the namespace exists or not.
 455                 if ( MWNamespace::exists( $namespace ) ) {
 456                         if ( $namespace == NS_MAIN ) {
 457                                 $name = $context->msg( 'blanknamespace' )->text();
 458                         } else {
 459                                 $name = $wgContLang->getFormattedNsText( $namespace );
 460                         }
 461                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 462                 } else {
 463                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 464                 }
 465         }
 466
 467         /**
 468          * @param $title Title
 469          * @return Title
 470          */
 471         static function normaliseSpecialPage( Title $title ) {
 472                 if ( $title->isSpecialPage() ) {
 473                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 474                         if ( !$name ) {
 475                                 return $title;
 476                         }
 477                         $ret = SpecialPage::getTitleFor( $name, $subpage );
 478                         $ret->mFragment = $title->getFragment();
 479                         return $ret;
 480                 } else {
 481                         return $title;
 482                 }
 483         }
 484
 485         /**
 486          * Returns the filename part of an url.
 487          * Used as alternative text for external images.
 488          *
 489          * @param $url string
 490          *
 491          * @return string
 492          */
 493         private static function fnamePart( $url ) {
 494                 $basename = strrchr( $url, '/' );
 495                 if ( false === $basename ) {
 496                         $basename = $url;
 497                 } else {
 498                         $basename = substr( $basename, 1 );
 499                 }
 500                 return $basename;
 501         }
 502
 503         /**
 504          * Return the code for images which were added via external links,
 505          * via Parser::maybeMakeExternalImage().
 506          *
 507          * @param $url
 508          * @param $alt
 509          *
 510          * @return string
 511          */
 512         public static function makeExternalImage( $url, $alt = '' ) {
 513                 if ( $alt == '' ) {
 514                         $alt = self::fnamePart( $url );
 515                 }
 516                 $img = '';
 517                 $success = wfRunHooks( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
 518                 if ( !$success ) {
 519                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image with url {$url} and alt text {$alt} to {$img}\n", true );
 520                         return $img;
 521                 }
 522                 return Html::element( 'img',
 523                         array(
 524                                 'src' => $url,
 525                                 'alt' => $alt ) );
 526         }
 527
 528         /**
 529          * Given parameters derived from [[Image:Foo|options...]], generate the
 530          * HTML that that syntax inserts in the page.
 531          *
 532          * @param $parser Parser object
 533          * @param $title Title object of the file (not the currently viewed page)
 534          * @param $file File object, or false if it doesn't exist
 535          * @param array $frameParams associative array of parameters external to the media handler.
 536          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 537          *     will often be false.
 538          *          thumbnail       If present, downscale and frame
 539          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 540          *          framed          Shows image in original size in a frame
 541          *          frameless       Downscale but don't frame
 542          *          upright         If present, tweak default sizes for portrait orientation
 543          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 544          *          border          If present, show a border around the image
 545          *          align           Horizontal alignment (left, right, center, none)
 546          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 547          *                          bottom, text-bottom)
 548          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 549          *          class           HTML for image classes. Plain text.
 550          *          caption         HTML for image caption.
 551          *          link-url        URL to link to
 552          *          link-title      Title object to link to
 553          *          link-target     Value for the target attribute, only with link-url
 554          *          no-link         Boolean, suppress description link
 555          *
 556          * @param array $handlerParams associative array of media handler parameters, to be passed
 557          *       to transform(). Typical keys are "width" and "page".
 558          * @param string $time timestamp of the file, set as false for current
 559          * @param string $query query params for desc url
 560          * @param $widthOption: Used by the parser to remember the user preference thumbnailsize
 561          * @since 1.20
 562          * @return String: HTML for an image, with links, wrappers, etc.
 563          */
 564         public static function makeImageLink( /*Parser*/ $parser, Title $title, $file, $frameParams = array(),
 565                 $handlerParams = array(), $time = false, $query = "", $widthOption = null
 566         ) {
 567                 $res = null;
 568                 $dummy = new DummyLinker;
 569                 if ( !wfRunHooks( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
 570                         &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
 571                         return $res;
 572                 }
 573
 574                 if ( $file && !$file->allowInlineDisplay() ) {
 575                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 576                         return self::link( $title );
 577                 }
 578
 579                 // Shortcuts
 580                 $fp =& $frameParams;
 581                 $hp =& $handlerParams;
 582
 583                 // Clean up parameters
 584                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 585                 if ( !isset( $fp['align'] ) ) {
 586                         $fp['align'] = '';
 587                 }
 588                 if ( !isset( $fp['alt'] ) ) {
 589                         $fp['alt'] = '';
 590                 }
 591                 if ( !isset( $fp['title'] ) ) {
 592                         $fp['title'] = '';
 593                 }
 594                 if ( !isset( $fp['class'] ) ) {
 595                         $fp['class'] = '';
 596                 }
 597
 598                 $prefix = $postfix = '';
 599
 600                 if ( 'center' == $fp['align'] ) {
 601                         $prefix = '<div class="center">';
 602                         $postfix = '</div>';
 603                         $fp['align'] = 'none';
 604                 }
 605                 if ( $file && !isset( $hp['width'] ) ) {
 606                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 607                                 // If its a vector image, and user only specifies height
 608                                 // we don't want it to be limited by its "normal" width.
 609                                 global $wgSVGMaxSize;
 610                                 $hp['width'] = $wgSVGMaxSize;
 611                         } else {
 612                                 $hp['width'] = $file->getWidth( $page );
 613                         }
 614
 615                         if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) || isset( $fp['frameless'] ) || !$hp['width'] ) {
 616                                 global $wgThumbLimits, $wgThumbUpright;
 617                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 618                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 619                                 }
 620
 621                                 // Reduce width for upright images when parameter 'upright' is used
 622                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 623                                         $fp['upright'] = $wgThumbUpright;
 624                                 }
 625                                 // For caching health: If width scaled down due to upright parameter, round to full __0 pixel to avoid the creation of a lot of odd thumbs
 626                                 $prefWidth = isset( $fp['upright'] ) ?
 627                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 628                                         $wgThumbLimits[$widthOption];
 629
 630                                 // Use width which is smaller: real image width or user preference width
 631                                 // Unless image is scalable vector.
 632                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 633                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 634                                         $hp['width'] = $prefWidth;
 635                                 }
 636                         }
 637                 }
 638
 639                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 640                         # Create a thumbnail. Alignment depends on the writing direction of
 641                         # the page content language (right-aligned for LTR languages,
 642                         # left-aligned for RTL languages)
 643                         #
 644                         # If a thumbnail width has not been provided, it is set
 645                         # to the default user option as specified in Language*.php
 646                         if ( $fp['align'] == '' ) {
 647                                 if ( $parser instanceof Parser ) {
 648                                         $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 649                                 } else {
 650                                         # backwards compatibility, remove with makeImageLink2()
 651                                         global $wgContLang;
 652                                         $fp['align'] = $wgContLang->alignEnd();
 653                                 }
 654                         }
 655                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 656                 }
 657
 658                 if ( $file && isset( $fp['frameless'] ) ) {
 659                         $srcWidth = $file->getWidth( $page );
 660                         # For "frameless" option: do not present an image bigger than the source (for bitmap-style images)
 661                         # This is the same behavior as the "thumb" option does it already.
 662                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 663                                 $hp['width'] = $srcWidth;
 664                         }
 665                 }
 666
 667                 if ( $file && isset( $hp['width'] ) ) {
 668                         # Create a resized image, without the additional thumbnail features
 669                         $thumb = $file->transform( $hp );
 670                 } else {
 671                         $thumb = false;
 672                 }
 673
 674                 if ( !$thumb ) {
 675                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 676                 } else {
 677                         self::processResponsiveImages( $file, $thumb, $hp );
 678                         $params = array(
 679                                 'alt' => $fp['alt'],
 680                                 'title' => $fp['title'],
 681                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 682                                 'img-class' => $fp['class'] );
 683                         if ( isset( $fp['border'] ) ) {
 684                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 685                         }
 686                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 687
 688                         $s = $thumb->toHtml( $params );
 689                 }
 690                 if ( $fp['align'] != '' ) {
 691                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 692                 }
 693                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 694         }
 695
 696         /**
 697          * See makeImageLink()
 698          * When this function is removed, remove if( $parser instanceof Parser ) check there too
 699          * @deprecated since 1.20
 700          */
 701         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 702                 $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
 703                 return self::makeImageLink( null, $title, $file, $frameParams,
 704                         $handlerParams, $time, $query, $widthOption );
 705         }
 706
 707         /**
 708          * Get the link parameters for MediaTransformOutput::toHtml() from given
 709          * frame parameters supplied by the Parser.
 710          * @param array $frameParams The frame parameters
 711          * @param string $query An optional query string to add to description page links
 712          * @return array
 713          */
 714         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 715                 $mtoParams = array();
 716                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 717                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 718                         if ( isset( $frameParams['link-target'] ) ) {
 719                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 720                         }
 721                         if ( $parser ) {
 722                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 723                                 foreach ( $extLinkAttrs as $name => $val ) {
 724                                         // Currently could include 'rel' and 'target'
 725                                         $mtoParams['parser-extlink-' . $name] = $val;
 726                                 }
 727                         }
 728                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 729                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 730                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 731                         // No link
 732                 } else {
 733                         $mtoParams['desc-link'] = true;
 734                         $mtoParams['desc-query'] = $query;
 735                 }
 736                 return $mtoParams;
 737         }
 738
 739         /**
 740          * Make HTML for a thumbnail including image, border and caption
 741          * @param $title Title object
 742          * @param $file File object or false if it doesn't exist
 743          * @param $label String
 744          * @param $alt String
 745          * @param $align String
 746          * @param $params Array
 747          * @param $framed Boolean
 748          * @param $manualthumb String
 749          * @return mixed
 750          */
 751         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 752                 $align = 'right', $params = array(), $framed = false, $manualthumb = ""
 753         ) {
 754                 $frameParams = array(
 755                         'alt' => $alt,
 756                         'caption' => $label,
 757                         'align' => $align
 758                 );
 759                 if ( $framed ) {
 760                         $frameParams['framed'] = true;
 761                 }
 762                 if ( $manualthumb ) {
 763                         $frameParams['manualthumb'] = $manualthumb;
 764                 }
 765                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 766         }
 767
 768         /**
 769          * @param $title Title
 770          * @param  $file File
 771          * @param array $frameParams
 772          * @param array $handlerParams
 773          * @param bool $time
 774          * @param string $query
 775          * @return mixed
 776          */
 777         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 778                 $handlerParams = array(), $time = false, $query = ""
 779         ) {
 780                 global $wgStylePath, $wgContLang;
 781                 $exists = $file && $file->exists();
 782
 783                 # Shortcuts
 784                 $fp =& $frameParams;
 785                 $hp =& $handlerParams;
 786
 787                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 788                 if ( !isset( $fp['align'] ) ) {
 789                         $fp['align'] = 'right';
 790                 }
 791                 if ( !isset( $fp['alt'] ) ) {
 792                         $fp['alt'] = '';
 793                 }
 794                 if ( !isset( $fp['title'] ) ) {
 795                         $fp['title'] = '';
 796                 }
 797                 if ( !isset( $fp['caption'] ) ) {
 798                         $fp['caption'] = '';
 799                 }
 800
 801                 if ( empty( $hp['width'] ) ) {
 802                         // Reduce width for upright images when parameter 'upright' is used
 803                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 804                 }
 805                 $thumb = false;
 806                 $noscale = false;
 807                 $manualthumb = false;
 808
 809                 if ( !$exists ) {
 810                         $outerWidth = $hp['width'] + 2;
 811                 } else {
 812                         if ( isset( $fp['manualthumb'] ) ) {
 813                                 # Use manually specified thumbnail
 814                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 815                                 if ( $manual_title ) {
 816                                         $manual_img = wfFindFile( $manual_title );
 817                                         if ( $manual_img ) {
 818                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 819                                                 $manualthumb = true;
 820                                         } else {
 821                                                 $exists = false;
 822                                         }
 823                                 }
 824                         } elseif ( isset( $fp['framed'] ) ) {
 825                                 // Use image dimensions, don't scale
 826                                 $thumb = $file->getUnscaledThumb( $hp );
 827                                 $noscale = true;
 828                         } else {
 829                                 # Do not present an image bigger than the source, for bitmap-style images
 830                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 831                                 $srcWidth = $file->getWidth( $page );
 832                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 833                                         $hp['width'] = $srcWidth;
 834                                 }
 835                                 $thumb = $file->transform( $hp );
 836                         }
 837
 838                         if ( $thumb ) {
 839                                 $outerWidth = $thumb->getWidth() + 2;
 840                         } else {
 841                                 $outerWidth = $hp['width'] + 2;
 842                         }
 843                 }
 844
 845                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 846                 # So we don't need to pass it here in $query. However, the URL for the
 847                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 848                 $url = $title->getLocalURL( $query );
 849                 if ( $page ) {
 850                         $url = wfAppendQuery( $url, array( 'page' => $page ) );
 851                 }
 852                 if ( $manualthumb
 853                         && !isset( $fp['link-title'] )
 854                         && !isset( $fp['link-url'] )
 855                         && !isset( $fp['no-link'] ) ) {
 856                         $fp['link-url'] = $url;
 857                 }
 858
 859                 $s = "<div class=\"thumb t{$fp['align']}\"><div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 860                 if ( !$exists ) {
 861                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 862                         $zoomIcon = '';
 863                 } elseif ( !$thumb ) {
 864                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 865                         $zoomIcon = '';
 866                 } else {
 867                         if ( !$noscale && !$manualthumb ) {
 868                                 self::processResponsiveImages( $file, $thumb, $hp );
 869                         }
 870                         $params = array(
 871                                 'alt' => $fp['alt'],
 872                                 'title' => $fp['title'],
 873                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== '' ? $fp['class'] . ' ' : '' ) . 'thumbimage'
 874                         );
 875                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 876                         $s .= $thumb->toHtml( $params );
 877                         if ( isset( $fp['framed'] ) ) {
 878                                 $zoomIcon = "";
 879                         } else {
 880                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 881                                         Html::rawElement( 'a', array(
 882                                                 'href' => $url,
 883                                                 'class' => 'internal',
 884                                                 'title' => wfMessage( 'thumbnail-more' )->text() ),
 885                                                 Html::element( 'img', array(
 886                                                         'src' => $wgStylePath . '/common/images/magnify-clip' . ( $wgContLang->isRTL() ? '-rtl' : '' ) . '.png',
 887                                                         'width' => 15,
 888                                                         'height' => 11,
 889                                                         'alt' => "" ) ) ) );
 890                         }
 891                 }
 892                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 893                 return str_replace( "\n", ' ', $s );
 894         }
 895
 896         /**
 897          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 898          * applicable.
 899          *
 900          * @param File $file
 901          * @param MediaOutput $thumb
 902          * @param array $hp image parameters
 903          */
 904         public static function processResponsiveImages( $file, $thumb, $hp ) {
 905                 global $wgResponsiveImages;
 906                 if ( $wgResponsiveImages ) {
 907                         $hp15 = $hp;
 908                         $hp15['width'] = round( $hp['width'] * 1.5 );
 909                         $hp20 = $hp;
 910                         $hp20['width'] = $hp['width'] * 2;
 911                         if ( isset( $hp['height'] ) ) {
 912                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 913                                 $hp20['height'] = $hp['height'] * 2;
 914                         }
 915
 916                         $thumb15 = $file->transform( $hp15 );
 917                         $thumb20 = $file->transform( $hp20 );
 918                         if ( $thumb15->url !== $thumb->url ) {
 919                                 $thumb->responsiveUrls['1.5'] = $thumb15->url;
 920                         }
 921                         if ( $thumb20->url !== $thumb->url ) {
 922                                 $thumb->responsiveUrls['2'] = $thumb20->url;
 923                         }
 924                 }
 925         }
 926
 927         /**
 928          * Make a "broken" link to an image
 929          *
 930          * @param $title Title object
 931          * @param string $label link label (plain text)
 932          * @param string $query query string
 933          * @param $unused1 Unused parameter kept for b/c
 934          * @param $unused2 Unused parameter kept for b/c
 935          * @param $time Boolean: a file of a certain timestamp was requested
 936          * @return String
 937          */
 938         public static function makeBrokenImageLinkObj( $title, $label = '', $query = '', $unused1 = '', $unused2 = '', $time = false ) {
 939                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 940                 if ( ! $title instanceof Title ) {
 941                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 942                 }
 943                 wfProfileIn( __METHOD__ );
 944                 if ( $label == '' ) {
 945                         $label = $title->getPrefixedText();
 946                 }
 947                 $encLabel = htmlspecialchars( $label );
 948                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 949
 950                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads ) && !$currentExists ) {
 951                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 952
 953                         if ( $redir ) {
 954                                 wfProfileOut( __METHOD__ );
 955                                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 956                         }
 957
 958                         $href = self::getUploadUrl( $title, $query );
 959
 960                         wfProfileOut( __METHOD__ );
 961                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 962                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 963                                 $encLabel . '</a>';
 964                 }
 965
 966                 wfProfileOut( __METHOD__ );
 967                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 968         }
 969
 970         /**
 971          * Get the URL to upload a certain file
 972          *
 973          * @param $destFile Title object of the file to upload
 974          * @param string $query urlencoded query string to prepend
 975          * @return String: urlencoded URL
 976          */
 977         protected static function getUploadUrl( $destFile, $query = '' ) {
 978                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 979                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 980                 if ( $query != '' ) {
 981                         $q .= '&' . $query;
 982                 }
 983
 984                 if ( $wgUploadMissingFileUrl ) {
 985                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 986                 } elseif ( $wgUploadNavigationUrl ) {
 987                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 988                 } else {
 989                         $upload = SpecialPage::getTitleFor( 'Upload' );
 990                         return $upload->getLocalURL( $q );
 991                 }
 992         }
 993
 994         /**
 995          * Create a direct link to a given uploaded file.
 996          *
 997          * @param $title Title object.
 998          * @param string $html pre-sanitized HTML
 999          * @param string $time MW timestamp of file creation time
1000          * @return String: HTML
1001          */
1002         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
1003                 $img = wfFindFile( $title, array( 'time' => $time ) );
1004                 return self::makeMediaLinkFile( $title, $img, $html );
1005         }
1006
1007         /**
1008          * Create a direct link to a given uploaded file.
1009          * This will make a broken link if $file is false.
1010          *
1011          * @param $title Title object.
1012          * @param $file File|bool mixed File object or false
1013          * @param string $html pre-sanitized HTML
1014          * @return String: HTML
1015          *
1016          * @todo Handle invalid or missing images better.
1017          */
1018         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
1019                 if ( $file && $file->exists() ) {
1020                         $url = $file->getURL();
1021                         $class = 'internal';
1022                 } else {
1023                         $url = self::getUploadUrl( $title );
1024                         $class = 'new';
1025                 }
1026                 $alt = htmlspecialchars( $title->getText(), ENT_QUOTES );
1027                 if ( $html == '' ) {
1028                         $html = $alt;
1029                 }
1030                 $u = htmlspecialchars( $url );
1031                 return "<a href=\"{$u}\" class=\"$class\" title=\"{$alt}\">{$html}</a>";
1032         }
1033
1034         /**
1035          * Make a link to a special page given its name and, optionally,
1036          * a message key from the link text.
1037          * Usage example: Linker::specialLink( 'Recentchanges' )
1038          *
1039          * @return string
1040          */
1041         public static function specialLink( $name, $key = '' ) {
1042                 if ( $key == '' ) {
1043                         $key = strtolower( $name );
1044                 }
1045
1046                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
1047         }
1048
1049         /**
1050          * Make an external link
1051          * @param string $url URL to link to
1052          * @param string $text text of link
1053          * @param $escape Boolean: do we escape the link text?
1054          * @param string $linktype type of external link. Gets added to the classes
1055          * @param array $attribs of extra attributes to <a>
1056          * @param $title Title|null Title object used for title specific link attributes
1057          * @return string
1058          */
1059         public static function makeExternalLink( $url, $text, $escape = true, $linktype = '', $attribs = array(), $title = null ) {
1060                 global $wgTitle;
1061                 $class = "external";
1062                 if ( $linktype ) {
1063                         $class .= " $linktype";
1064                 }
1065                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1066                         $class .= " {$attribs['class']}";
1067                 }
1068                 $attribs['class'] = $class;
1069
1070                 if ( $escape ) {
1071                         $text = htmlspecialchars( $text );
1072                 }
1073
1074                 if ( !$title ) {
1075                         $title = $wgTitle;
1076                 }
1077                 $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
1078                 $link = '';
1079                 $success = wfRunHooks( 'LinkerMakeExternalLink',
1080                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
1081                 if ( !$success ) {
1082                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link 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 $userId   Integer: 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                 if ( $userId == 0 ) {
1099                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1100                         if ( $altUserName === false ) {
1101                                 $altUserName = IP::prettifyIP( $userName );
1102                         }
1103                 } else {
1104                         $page = Title::makeTitle( NS_USER, $userName );
1105                 }
1106
1107                 return self::link(
1108                         $page,
1109                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1110                         array( 'class' => 'mw-userlink' )
1111                 );
1112         }
1113
1114         /**
1115          * Generate standard user tool links (talk, contributions, block link, etc.)
1116          *
1117          * @param $userId Integer: user identifier
1118          * @param string $userText user name or IP address
1119          * @param $redContribsWhenNoEdits Boolean: should the contributions link be
1120          *        red if the user has no edits?
1121          * @param $flags Integer: customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK and Linker::TOOL_LINKS_EMAIL)
1122          * @param $edits Integer: user edit count (optional, for performance)
1123          * @return String: HTML fragment
1124          */
1125         public static function userToolLinks(
1126                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1127         ) {
1128                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1129                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1130                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1131                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1132
1133                 $items = array();
1134                 if ( $talkable ) {
1135                         $items[] = self::userTalkLink( $userId, $userText );
1136                 }
1137                 if ( $userId ) {
1138                         // check if the user has an edit
1139                         $attribs = array();
1140                         if ( $redContribsWhenNoEdits ) {
1141                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1142                                         $user = User::newFromId( $userId );
1143                                         $edits = $user->getEditCount();
1144                                 }
1145                                 if ( $edits === 0 ) {
1146                                         $attribs['class'] = 'new';
1147                                 }
1148                         }
1149                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1150
1151                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1152                 }
1153                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1154                         $items[] = self::blockLink( $userId, $userText );
1155                 }
1156
1157                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1158                         $items[] = self::emailLink( $userId, $userText );
1159                 }
1160
1161                 wfRunHooks( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
1162
1163                 if ( $items ) {
1164                         return wfMessage( 'word-separator' )->plain()
1165                                 . '<span class="mw-usertoollinks">'
1166                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1167                                 . '</span>';
1168                 } else {
1169                         return '';
1170                 }
1171         }
1172
1173         /**
1174          * Alias for userToolLinks( $userId, $userText, true );
1175          * @param $userId Integer: user identifier
1176          * @param string $userText user name or IP address
1177          * @param $edits Integer: user edit count (optional, for performance)
1178          * @return String
1179          */
1180         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1181                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1182         }
1183
1184         /**
1185          * @param $userId Integer: user id in database.
1186          * @param string $userText user name in database.
1187          * @return String: HTML fragment with user talk link
1188          */
1189         public static function userTalkLink( $userId, $userText ) {
1190                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1191                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1192                 return $userTalkLink;
1193         }
1194
1195         /**
1196          * @param $userId Integer: userid
1197          * @param string $userText user name in database.
1198          * @return String: HTML fragment with block link
1199          */
1200         public static function blockLink( $userId, $userText ) {
1201                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1202                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1203                 return $blockLink;
1204         }
1205
1206         /**
1207          * @param $userId Integer: userid
1208          * @param string $userText user name in database.
1209          * @return String: HTML fragment with e-mail user link
1210          */
1211         public static function emailLink( $userId, $userText ) {
1212                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1213                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1214                 return $emailLink;
1215         }
1216
1217         /**
1218          * Generate a user link if the current user is allowed to view it
1219          * @param $rev Revision object.
1220          * @param $isPublic Boolean: show only if all users can see it
1221          * @return String: HTML fragment
1222          */
1223         public static function revUserLink( $rev, $isPublic = false ) {
1224                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1225                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1226                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1227                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1228                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1229                 } else {
1230                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1231                 }
1232                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1233                         return '<span class="history-deleted">' . $link . '</span>';
1234                 }
1235                 return $link;
1236         }
1237
1238         /**
1239          * Generate a user tool link cluster if the current user is allowed to view it
1240          * @param $rev Revision object.
1241          * @param $isPublic Boolean: show only if all users can see it
1242          * @return string HTML
1243          */
1244         public static function revUserTools( $rev, $isPublic = false ) {
1245                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1246                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1247                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1248                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1249                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1250                         $link = self::userLink( $userId, $userText )
1251                                 . wfMessage( 'word-separator' )->plain()
1252                                 . self::userToolLinks( $userId, $userText );
1253                 } else {
1254                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1255                 }
1256                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1257                         return ' <span class="history-deleted">' . $link . '</span>';
1258                 }
1259                 return $link;
1260         }
1261
1262         /**
1263          * This function is called by all recent changes variants, by the page history,
1264          * and by the user contributions list. It is responsible for formatting edit
1265          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1266          * auto-generated comments (from section editing) and formats [[wikilinks]].
1267          *
1268          * @author Erik Moeller <moeller@scireview.de>
1269          *
1270          * Note: there's not always a title to pass to this function.
1271          * Since you can't set a default parameter for a reference, I've turned it
1272          * temporarily to a value pass. Should be adjusted further. --brion
1273          *
1274          * @param $comment String
1275          * @param $title Mixed: Title object (to generate link to the section in autocomment) or null
1276          * @param $local Boolean: whether section links should refer to local page
1277          * @return mixed|String
1278          */
1279         public static function formatComment( $comment, $title = null, $local = false ) {
1280                 wfProfileIn( __METHOD__ );
1281
1282                 # Sanitize text a bit:
1283                 $comment = str_replace( "\n", " ", $comment );
1284                 # Allow HTML entities (for bug 13815)
1285                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1286
1287                 # Render autocomments and make links:
1288                 $comment = self::formatAutocomments( $comment, $title, $local );
1289                 $comment = self::formatLinksInComment( $comment, $title, $local );
1290
1291                 wfProfileOut( __METHOD__ );
1292                 return $comment;
1293         }
1294
1295         /**
1296          * @var Title
1297          */
1298         static $autocommentTitle;
1299         static $autocommentLocal;
1300
1301         /**
1302          * Converts autogenerated comments in edit summaries into section links.
1303          * The pattern for autogen comments is / * foo * /, which makes for
1304          * some nasty regex.
1305          * We look for all comments, match any text before and after the comment,
1306          * add a separator where needed and format the comment itself with CSS
1307          * Called by Linker::formatComment.
1308          *
1309          * @param string $comment comment text
1310          * @param $title Title|null An optional title object used to links to sections
1311          * @param $local Boolean: whether section links should refer to local page
1312          * @return String: formatted comment
1313          */
1314         private static function formatAutocomments( $comment, $title = null, $local = false ) {
1315                 // Bah!
1316                 self::$autocommentTitle = $title;
1317                 self::$autocommentLocal = $local;
1318                 $comment = preg_replace_callback(
1319                         '!(.*)/\*\s*(.*?)\s*\*/(.*)!',
1320                         array( 'Linker', 'formatAutocommentsCallback' ),
1321                         $comment );
1322                 self::$autocommentTitle = null;
1323                 self::$autocommentLocal = null;
1324                 return $comment;
1325         }
1326
1327         /**
1328          * Helper function for Linker::formatAutocomments
1329          * @param $match
1330          * @return string
1331          */
1332         private static function formatAutocommentsCallback( $match ) {
1333                 global $wgLang;
1334                 $title = self::$autocommentTitle;
1335                 $local = self::$autocommentLocal;
1336
1337                 $pre = $match[1];
1338                 $auto = $match[2];
1339                 $post = $match[3];
1340                 $comment = null;
1341                 wfRunHooks( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local ) );
1342                 if ( $comment === null ) {
1343                         $link = '';
1344                         if ( $title ) {
1345                                 $section = $auto;
1346
1347                                 # Remove links that a user may have manually put in the autosummary
1348                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1349                                 $section = str_replace( '[[:', '', $section );
1350                                 $section = str_replace( '[[', '', $section );
1351                                 $section = str_replace( ']]', '', $section );
1352
1353                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1354                                 if ( $local ) {
1355                                         $sectionTitle = Title::newFromText( '#' . $section );
1356                                 } else {
1357                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1358                                                 $title->getDBkey(), $section );
1359                                 }
1360                                 if ( $sectionTitle ) {
1361                                         $link = self::link( $sectionTitle,
1362                                                 $wgLang->getArrow(), array(), array(),
1363                                                 'noclasses' );
1364                                 } else {
1365                                         $link = '';
1366                                 }
1367                         }
1368                         if ( $pre ) {
1369                                 # written summary $presep autocomment (summary /* section */)
1370                                 $pre .= wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1371                         }
1372                         if ( $post ) {
1373                                 # autocomment $postsep written summary (/* section */ summary)
1374                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1375                         }
1376                         $auto = '<span class="autocomment">' . $auto . '</span>';
1377                         $comment = $pre . $link . $wgLang->getDirMark() . '<span dir="auto">' . $auto . $post . '</span>';
1378                 }
1379                 return $comment;
1380         }
1381
1382         /**
1383          * @var Title
1384          */
1385         static $commentContextTitle;
1386         static $commentLocal;
1387
1388         /**
1389          * Formats wiki links and media links in text; all other wiki formatting
1390          * is ignored
1391          *
1392          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1393          * @param string $comment text to format links in
1394          * @param $title Title|null An optional title object used to links to sections
1395          * @param $local Boolean: whether section links should refer to local page
1396          * @return String
1397          */
1398         public static function formatLinksInComment( $comment, $title = null, $local = false ) {
1399                 self::$commentContextTitle = $title;
1400                 self::$commentLocal = $local;
1401                 $html = preg_replace_callback(
1402                         '/
1403                                 \[\[
1404                                 :? # ignore optional leading colon
1405                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1406                                 (?:\|
1407                                         # 2. a pipe-separated substring; only the last is captured
1408                                         # Stop matching at | and ]] without relying on backtracking.
1409                                         ((?:]?[^\]|])*+)
1410                                 )*
1411                                 \]\]
1412                                 ([^[]*) # 3. link trail (the text up until the next link)
1413                         /x',
1414                         array( 'Linker', 'formatLinksInCommentCallback' ),
1415                         $comment );
1416                 self::$commentContextTitle = null;
1417                 self::$commentLocal = null;
1418                 return $html;
1419         }
1420
1421         /**
1422          * @param $match
1423          * @return mixed
1424          */
1425         protected static function formatLinksInCommentCallback( $match ) {
1426                 global $wgContLang;
1427
1428                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1429                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1430
1431                 $comment = $match[0];
1432
1433                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1434                 if ( strpos( $match[1], '%' ) !== false ) {
1435                         $match[1] = str_replace( array( '<', '>' ), array( '&lt;', '&gt;' ), rawurldecode( $match[1] ) );
1436                 }
1437
1438                 # Handle link renaming [[foo|text]] will show link as "text"
1439                 if ( $match[2] != "" ) {
1440                         $text = $match[2];
1441                 } else {
1442                         $text = $match[1];
1443                 }
1444                 $submatch = array();
1445                 $thelink = null;
1446                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1447                         # Media link; trail not supported.
1448                         $linkRegexp = '/\[\[(.*?)\]\]/';
1449                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1450                         if ( $title ) {
1451                                 $thelink = self::makeMediaLinkObj( $title, $text );
1452                         }
1453                 } else {
1454                         # Other kind of link
1455                         if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
1456                                 $trail = $submatch[1];
1457                         } else {
1458                                 $trail = "";
1459                         }
1460                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1461                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1462                                 $match[1] = substr( $match[1], 1 );
1463                         }
1464                         list( $inside, $trail ) = self::splitTrail( $trail );
1465
1466                         $linkText = $text;
1467                         $linkTarget = self::normalizeSubpageLink( self::$commentContextTitle,
1468                                 $match[1], $linkText );
1469
1470                         $target = Title::newFromText( $linkTarget );
1471                         if ( $target ) {
1472                                 if ( $target->getText() == '' && $target->getInterwiki() === ''
1473                                         && !self::$commentLocal && self::$commentContextTitle
1474                                 ) {
1475                                         $newTarget = clone ( self::$commentContextTitle );
1476                                         $newTarget->setFragment( '#' . $target->getFragment() );
1477                                         $target = $newTarget;
1478                                 }
1479                                 $thelink = self::link(
1480                                         $target,
1481                                         $linkText . $inside
1482                                 ) . $trail;
1483                         }
1484                 }
1485                 if ( $thelink ) {
1486                         // If the link is still valid, go ahead and replace it in!
1487                         $comment = preg_replace( $linkRegexp, StringUtils::escapeRegexReplacement( $thelink ), $comment, 1 );
1488                 }
1489
1490                 return $comment;
1491         }
1492
1493         /**
1494          * @param $contextTitle Title
1495          * @param  $target
1496          * @param  $text
1497          * @return string
1498          */
1499         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1500                 # Valid link forms:
1501                 # Foobar -- normal
1502                 # :Foobar -- override special treatment of prefix (images, language links)
1503                 # /Foobar -- convert to CurrentPage/Foobar
1504                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1505                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1506                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1507
1508                 wfProfileIn( __METHOD__ );
1509                 $ret = $target; # default return value is no change
1510
1511                 # Some namespaces don't allow subpages,
1512                 # so only perform processing if subpages are allowed
1513                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1514                         $hash = strpos( $target, '#' );
1515                         if ( $hash !== false ) {
1516                                 $suffix = substr( $target, $hash );
1517                                 $target = substr( $target, 0, $hash );
1518                         } else {
1519                                 $suffix = '';
1520                         }
1521                         # bug 7425
1522                         $target = trim( $target );
1523                         # Look at the first character
1524                         if ( $target != '' && $target[0] === '/' ) {
1525                                 # / at end means we don't want the slash to be shown
1526                                 $m = array();
1527                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1528                                 if ( $trailingSlashes ) {
1529                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1530                                 } else {
1531                                         $noslash = substr( $target, 1 );
1532                                 }
1533
1534                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1535                                 if ( $text === '' ) {
1536                                         $text = $target . $suffix;
1537                                 } # this might be changed for ugliness reasons
1538                         } else {
1539                                 # check for .. subpage backlinks
1540                                 $dotdotcount = 0;
1541                                 $nodotdot = $target;
1542                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1543                                         ++$dotdotcount;
1544                                         $nodotdot = substr( $nodotdot, 3 );
1545                                 }
1546                                 if ( $dotdotcount > 0 ) {
1547                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1548                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1549                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1550                                                 # / at the end means don't show full path
1551                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1552                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1553                                                         if ( $text === '' ) {
1554                                                                 $text = $nodotdot . $suffix;
1555                                                         }
1556                                                 }
1557                                                 $nodotdot = trim( $nodotdot );
1558                                                 if ( $nodotdot != '' ) {
1559                                                         $ret .= '/' . $nodotdot;
1560                                                 }
1561                                                 $ret .= $suffix;
1562                                         }
1563                                 }
1564                         }
1565                 }
1566
1567                 wfProfileOut( __METHOD__ );
1568                 return $ret;
1569         }
1570
1571         /**
1572          * Wrap a comment in standard punctuation and formatting if
1573          * it's non-empty, otherwise return empty string.
1574          *
1575          * @param $comment String
1576          * @param $title Mixed: Title object (to generate link to section in autocomment) or null
1577          * @param $local Boolean: whether section links should refer to local page
1578          *
1579          * @return string
1580          */
1581         public static function commentBlock( $comment, $title = null, $local = false ) {
1582                 // '*' used to be the comment inserted by the software way back
1583                 // in antiquity in case none was provided, here for backwards
1584                 // compatibility, acc. to brion -ævar
1585                 if ( $comment == '' || $comment == '*' ) {
1586                         return '';
1587                 } else {
1588                         $formatted = self::formatComment( $comment, $title, $local );
1589                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1590                         return " <span class=\"comment\">$formatted</span>";
1591                 }
1592         }
1593
1594         /**
1595          * Wrap and format the given revision's comment block, if the current
1596          * user is allowed to view it.
1597          *
1598          * @param $rev Revision object
1599          * @param $local Boolean: whether section links should refer to local page
1600          * @param $isPublic Boolean: show only if all users can see it
1601          * @return String: HTML fragment
1602          */
1603         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1604                 if ( $rev->getRawComment() == "" ) {
1605                         return "";
1606                 }
1607                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1608                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1609                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1610                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1611                                 $rev->getTitle(), $local );
1612                 } else {
1613                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1614                 }
1615                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1616                         return " <span class=\"history-deleted\">$block</span>";
1617                 }
1618                 return $block;
1619         }
1620
1621         /**
1622          * @param $size
1623          * @return string
1624          */
1625         public static function formatRevisionSize( $size ) {
1626                 if ( $size == 0 ) {
1627                         $stxt = wfMessage( 'historyempty' )->escaped();
1628                 } else {
1629                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1630                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1631                 }
1632                 return "<span class=\"history-size\">$stxt</span>";
1633         }
1634
1635         /**
1636          * Add another level to the Table of Contents
1637          *
1638          * @return string
1639          */
1640         public static function tocIndent() {
1641                 return "\n<ul>";
1642         }
1643
1644         /**
1645          * Finish one or more sublevels on the Table of Contents
1646          *
1647          * @return string
1648          */
1649         public static function tocUnindent( $level ) {
1650                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1651         }
1652
1653         /**
1654          * parameter level defines if we are on an indentation level
1655          *
1656          * @return string
1657          */
1658         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1659                 $classes = "toclevel-$level";
1660                 if ( $sectionIndex !== false ) {
1661                         $classes .= " tocsection-$sectionIndex";
1662                 }
1663                 return "\n<li class=\"$classes\"><a href=\"#" .
1664                         $anchor . '"><span class="tocnumber">' .
1665                         $tocnumber . '</span> <span class="toctext">' .
1666                         $tocline . '</span></a>';
1667         }
1668
1669         /**
1670          * End a Table Of Contents line.
1671          * tocUnindent() will be used instead if we're ending a line below
1672          * the new level.
1673          * @return string
1674          */
1675         public static function tocLineEnd() {
1676                 return "</li>\n";
1677         }
1678
1679         /**
1680          * Wraps the TOC in a table and provides the hide/collapse javascript.
1681          *
1682          * @param string $toc html of the Table Of Contents
1683          * @param $lang String|Language|false: Language for the toc title, defaults to user language
1684          * @return String: full html of the TOC
1685          */
1686         public static function tocList( $toc, $lang = false ) {
1687                 $lang = wfGetLangObj( $lang );
1688                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1689
1690                 return '<div id="toc" class="toc">'
1691                         . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1692                         . $toc
1693                         . "</ul>\n</div>\n";
1694         }
1695
1696         /**
1697          * Generate a table of contents from a section tree
1698          * Currently unused.
1699          *
1700          * @param array $tree Return value of ParserOutput::getSections()
1701          * @return String: HTML fragment
1702          */
1703         public static function generateTOC( $tree ) {
1704                 $toc = '';
1705                 $lastLevel = 0;
1706                 foreach ( $tree as $section ) {
1707                         if ( $section['toclevel'] > $lastLevel ) {
1708                                 $toc .= self::tocIndent();
1709                         } elseif ( $section['toclevel'] < $lastLevel ) {
1710                                 $toc .= self::tocUnindent(
1711                                         $lastLevel - $section['toclevel'] );
1712                         } else {
1713                                 $toc .= self::tocLineEnd();
1714                         }
1715
1716                         $toc .= self::tocLine( $section['anchor'],
1717                                 $section['line'], $section['number'],
1718                                 $section['toclevel'], $section['index'] );
1719                         $lastLevel = $section['toclevel'];
1720                 }
1721                 $toc .= self::tocLineEnd();
1722                 return self::tocList( $toc );
1723         }
1724
1725         /**
1726          * Create a headline for content
1727          *
1728          * @param $level Integer: the level of the headline (1-6)
1729          * @param string $attribs any attributes for the headline, starting with
1730          *                 a space and ending with '>'
1731          *                 This *must* be at least '>' for no attribs
1732          * @param string $anchor the anchor to give the headline (the bit after the #)
1733          * @param string $html html for the text of the header
1734          * @param string $link HTML to add for the section edit link
1735          * @param $legacyAnchor Mixed: a second, optional anchor to give for
1736          *   backward compatibility (false to omit)
1737          *
1738          * @return String: HTML headline
1739          */
1740         public static function makeHeadline( $level, $attribs, $anchor, $html, $link, $legacyAnchor = false ) {
1741                 $ret = "<h$level$attribs"
1742                         . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1743                         . $link
1744                         . "</h$level>";
1745                 if ( $legacyAnchor !== false ) {
1746                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1747                 }
1748                 return $ret;
1749         }
1750
1751         /**
1752          * Split a link trail, return the "inside" portion and the remainder of the trail
1753          * as a two-element array
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 $rev Revision object
1791          * @param $context IContextSource context to use or null for the main context.
1792          * @param $options array
1793          * @return string
1794          */
1795         public static function generateRollback( $rev, IContextSource $context = null, $options = array( 'verify' ) ) {
1796                 if ( $context === null ) {
1797                         $context = RequestContext::getMain();
1798                 }
1799                 $editCount = false;
1800                 if ( in_array( 'verify', $options ) ) {
1801                         $editCount = self::getRollbackEditCount( $rev, true );
1802                         if ( $editCount === false ) {
1803                                 return '';
1804                         }
1805                 }
1806
1807                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1808
1809                 if ( !in_array( 'noBrackets', $options ) ) {
1810                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->plain();
1811                 }
1812
1813                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1814         }
1815
1816         /**
1817          * This function will return the number of revisions which a rollback
1818          * would revert and, if $verify is set it will verify that a revision
1819          * can be reverted (that the user isn't the only contributor and the
1820          * revision we might rollback to isn't deleted). These checks can only
1821          * function as an additional check as this function only checks against
1822          * the last $wgShowRollbackEditCount edits.
1823          *
1824          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1825          * is set and the user is the only contributor of the page.
1826          *
1827          * @param $rev Revision object
1828          * @param bool $verify Try to verify that this revision can really be rolled back
1829          * @return integer|bool|null
1830          */
1831         public static function getRollbackEditCount( $rev, $verify ) {
1832                 global $wgShowRollbackEditCount;
1833                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1834                         // Nothing has happened, indicate this by returning 'null'
1835                         return null;
1836                 }
1837
1838                 $dbr = wfGetDB( DB_SLAVE );
1839
1840                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1841                 $res = $dbr->select(
1842                         'revision',
1843                         array( 'rev_user_text', 'rev_deleted' ),
1844                         // $rev->getPage() returns null sometimes
1845                         array( 'rev_page' => $rev->getTitle()->getArticleID() ),
1846                         __METHOD__,
1847                         array(
1848                                 'USE INDEX' => array( 'revision' => 'page_timestamp' ),
1849                                 'ORDER BY' => 'rev_timestamp DESC',
1850                                 'LIMIT' => $wgShowRollbackEditCount + 1
1851                         )
1852                 );
1853
1854                 $editCount = 0;
1855                 $moreRevs = false;
1856                 foreach ( $res as $row ) {
1857                         if ( $rev->getRawUserText() != $row->rev_user_text ) {
1858                                 if ( $verify && ( $row->rev_deleted & Revision::DELETED_TEXT || $row->rev_deleted & Revision::DELETED_USER ) ) {
1859                                         // If the user or the text of the revision we might rollback to is deleted in some way we can't rollback
1860                                         // Similar to the sanity checks in WikiPage::commitRollback
1861                                         return false;
1862                                 }
1863                                 $moreRevs = true;
1864                                 break;
1865                         }
1866                         $editCount++;
1867                 }
1868
1869                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1870                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1871                         // and there weren't any other revisions. That means that the current user is the only
1872                         // editor, so we can't rollback
1873                         return false;
1874                 }
1875                 return $editCount;
1876         }
1877
1878         /**
1879          * Build a raw rollback link, useful for collections of "tool" links
1880          *
1881          * @param $rev Revision object
1882          * @param $context IContextSource context to use or null for the main context.
1883          * @param $editCount integer Number of edits that would be reverted
1884          * @return String: HTML fragment
1885          */
1886         public static function buildRollbackLink( $rev, IContextSource $context = null, $editCount = false ) {
1887                 global $wgShowRollbackEditCount, $wgMiserMode;
1888
1889                 // To config which pages are effected by miser mode
1890                 $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );
1891
1892                 if ( $context === null ) {
1893                         $context = RequestContext::getMain();
1894                 }
1895
1896                 $title = $rev->getTitle();
1897                 $query = array(
1898                         'action' => 'rollback',
1899                         'from' => $rev->getUserText(),
1900                         'token' => $context->getUser()->getEditToken( array( $title->getPrefixedText(), $rev->getUserText() ) ),
1901                 );
1902                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1903                         $query['bot'] = '1';
1904                         $query['hidediff'] = '1'; // bug 15999
1905                 }
1906
1907                 $disableRollbackEditCount = false;
1908                 if ( $wgMiserMode ) {
1909                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1910                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1911                                         $disableRollbackEditCount = true;
1912                                         break;
1913                                 }
1914                         }
1915                 }
1916
1917                 if ( !$disableRollbackEditCount && is_int( $wgShowRollbackEditCount ) && $wgShowRollbackEditCount > 0 ) {
1918                         if ( !is_numeric( $editCount ) ) {
1919                                 $editCount = self::getRollbackEditCount( $rev, false );
1920                         }
1921
1922                         if ( $editCount > $wgShowRollbackEditCount ) {
1923                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )->numParams( $wgShowRollbackEditCount )->parse();
1924                         } else {
1925                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1926                         }
1927
1928                         return self::link(
1929                                 $title,
1930                                 $editCount_output,
1931                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1932                                 $query,
1933                                 array( 'known', 'noclasses' )
1934                         );
1935                 } else {
1936                         return self::link(
1937                                 $title,
1938                                 $context->msg( 'rollbacklink' )->escaped(),
1939                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1940                                 $query,
1941                                 array( 'known', 'noclasses' )
1942                         );
1943                 }
1944         }
1945
1946         /**
1947          * Returns HTML for the "templates used on this page" list.
1948          *
1949          * Make an HTML list of templates, and then add a "More..." link at
1950          * the bottom. If $more is null, do not add a "More..." link. If $more
1951          * is a Title, make a link to that title and use it. If $more is a string,
1952          * directly paste it in as the link (escaping needs to be done manually).
1953          * Finally, if $more is a Message, call toString().
1954          *
1955          * @param array $templates Array of templates from Article::getUsedTemplate or similar
1956          * @param bool $preview Whether this is for a preview
1957          * @param bool $section Whether this is for a section edit
1958          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
1959          * @return String: HTML output
1960          */
1961         public static function formatTemplates( $templates, $preview = false, $section = false, $more = null ) {
1962                 global $wgLang;
1963                 wfProfileIn( __METHOD__ );
1964
1965                 $outText = '';
1966                 if ( count( $templates ) > 0 ) {
1967                         # Do a batch existence check
1968                         $batch = new LinkBatch;
1969                         foreach ( $templates as $title ) {
1970                                 $batch->addObj( $title );
1971                         }
1972                         $batch->execute();
1973
1974                         # Construct the HTML
1975                         $outText = '<div class="mw-templatesUsedExplanation">';
1976                         if ( $preview ) {
1977                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
1978                                         ->parseAsBlock();
1979                         } elseif ( $section ) {
1980                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
1981                                         ->parseAsBlock();
1982                         } else {
1983                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
1984                                         ->parseAsBlock();
1985                         }
1986                         $outText .= "</div><ul>\n";
1987
1988                         usort( $templates, 'Title::compare' );
1989                         foreach ( $templates as $titleObj ) {
1990                                 $protected = '';
1991                                 $restrictions = $titleObj->getRestrictions( 'edit' );
1992                                 if ( $restrictions ) {
1993                                         // Check backwards-compatible messages
1994                                         $msg = null;
1995                                         if ( $restrictions === array( 'sysop' ) ) {
1996                                                 $msg = wfMessage( 'template-protected' );
1997                                         } elseif ( $restrictions === array( 'autoconfirmed' ) ) {
1998                                                 $msg = wfMessage( 'template-semiprotected' );
1999                                         }
2000                                         if ( $msg && !$msg->isDisabled() ) {
2001                                                 $protected = $msg->parse();
2002                                         } else {
2003                                                 // Construct the message from restriction-level-*
2004                                                 // e.g. restriction-level-sysop, restriction-level-autoconfirmed
2005                                                 $msgs = array();
2006                                                 foreach ( $restrictions as $r ) {
2007                                                         $msgs[] = wfMessage( "restriction-level-$r" )->parse();
2008                                                 }
2009                                                 $protected = wfMessage( 'parentheses' )
2010                                                         ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
2011                                         }
2012                                 }
2013                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
2014                                         $editLink = self::link(
2015                                                 $titleObj,
2016                                                 wfMessage( 'editlink' )->text(),
2017                                                 array(),
2018                                                 array( 'action' => 'edit' )
2019                                         );
2020                                 } else {
2021                                         $editLink = self::link(
2022                                                 $titleObj,
2023                                                 wfMessage( 'viewsourcelink' )->text(),
2024                                                 array(),
2025                                                 array( 'action' => 'edit' )
2026                                         );
2027                                 }
2028                                 $outText .= '<li>' . self::link( $titleObj )
2029                                         . wfMessage( 'word-separator' )->escaped()
2030                                         . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
2031                                         . wfMessage( 'word-separator' )->escaped()
2032                                         . $protected . '</li>';
2033                         }
2034
2035                         if ( $more instanceof Title ) {
2036                                 $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
2037                         } elseif ( $more ) {
2038                                 $outText .= "<li>$more</li>";
2039                         }
2040
2041                         $outText .= '</ul>';
2042                 }
2043                 wfProfileOut( __METHOD__ );
2044                 return $outText;
2045         }
2046
2047         /**
2048          * Returns HTML for the "hidden categories on this page" list.
2049          *
2050          * @param array $hiddencats of hidden categories from Article::getHiddenCategories
2051          * or similar
2052          * @return String: HTML output
2053          */
2054         public static function formatHiddenCategories( $hiddencats ) {
2055                 wfProfileIn( __METHOD__ );
2056
2057                 $outText = '';
2058                 if ( count( $hiddencats ) > 0 ) {
2059                         # Construct the HTML
2060                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
2061                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
2062                         $outText .= "</div><ul>\n";
2063
2064                         foreach ( $hiddencats as $titleObj ) {
2065                                 $outText .= '<li>' . self::link( $titleObj, null, array(), array(), 'known' ) . "</li>\n"; # If it's hidden, it must exist - no need to check with a LinkBatch
2066                         }
2067                         $outText .= '</ul>';
2068                 }
2069                 wfProfileOut( __METHOD__ );
2070                 return $outText;
2071         }
2072
2073         /**
2074          * Format a size in bytes for output, using an appropriate
2075          * unit (B, KB, MB or GB) according to the magnitude in question
2076          *
2077          * @param int $size Size to format
2078          * @return String
2079          */
2080         public static function formatSize( $size ) {
2081                 global $wgLang;
2082                 return htmlspecialchars( $wgLang->formatSize( $size ) );
2083         }
2084
2085         /**
2086          * Given the id of an interface element, constructs the appropriate title
2087          * attribute from the system messages.  (Note, this is usually the id but
2088          * isn't always, because sometimes the accesskey needs to go on a different
2089          * element than the id, for reverse-compatibility, etc.)
2090          *
2091          * @param string $name id of the element, minus prefixes.
2092          * @param $options Mixed: null or the string 'withaccess' to add an access-
2093          *   key hint
2094          * @return String: contents of the title attribute (which you must HTML-
2095          *   escape), or false for no title attribute
2096          */
2097         public static function titleAttrib( $name, $options = null ) {
2098                 wfProfileIn( __METHOD__ );
2099
2100                 $message = wfMessage( "tooltip-$name" );
2101
2102                 if ( !$message->exists() ) {
2103                         $tooltip = false;
2104                 } else {
2105                         $tooltip = $message->text();
2106                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2107                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2108                         # Message equal to '-' means suppress it.
2109                         if ( $tooltip == '-' ) {
2110                                 $tooltip = false;
2111                         }
2112                 }
2113
2114                 if ( $options == 'withaccess' ) {
2115                         $accesskey = self::accesskey( $name );
2116                         if ( $accesskey !== false ) {
2117                                 if ( $tooltip === false || $tooltip === '' ) {
2118                                         $tooltip = wfMessage( 'brackets', $accesskey )->escaped();
2119                                 } else {
2120                                         $tooltip .= wfMessage( 'word-separator' )->escaped();
2121                                         $tooltip .= wfMessage( 'brackets', $accesskey )->escaped();
2122                                 }
2123                         }
2124                 }
2125
2126                 wfProfileOut( __METHOD__ );
2127                 return $tooltip;
2128         }
2129
2130         static $accesskeycache;
2131
2132         /**
2133          * Given the id of an interface element, constructs the appropriate
2134          * accesskey attribute from the system messages.  (Note, this is usually
2135          * the id but isn't always, because sometimes the accesskey needs to go on
2136          * a different element than the id, for reverse-compatibility, etc.)
2137          *
2138          * @param string $name id of the element, minus prefixes.
2139          * @return String: contents of the accesskey attribute (which you must HTML-
2140          *   escape), or false for no accesskey attribute
2141          */
2142         public static function accesskey( $name ) {
2143                 if ( isset( self::$accesskeycache[$name] ) ) {
2144                         return self::$accesskeycache[$name];
2145                 }
2146                 wfProfileIn( __METHOD__ );
2147
2148                 $message = wfMessage( "accesskey-$name" );
2149
2150                 if ( !$message->exists() ) {
2151                         $accesskey = false;
2152                 } else {
2153                         $accesskey = $message->plain();
2154                         if ( $accesskey === '' || $accesskey === '-' ) {
2155                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2156                                 # attribute, but this is broken for accesskey: that might be a useful
2157                                 # value.
2158                                 $accesskey = false;
2159                         }
2160                 }
2161
2162                 wfProfileOut( __METHOD__ );
2163                 return self::$accesskeycache[$name] = $accesskey;
2164         }
2165
2166         /**
2167          * Get a revision-deletion link, or disabled link, or nothing, depending
2168          * on user permissions & the settings on the revision.
2169          *
2170          * Will use forward-compatible revision ID in the Special:RevDelete link
2171          * if possible, otherwise the timestamp-based ID which may break after
2172          * undeletion.
2173          *
2174          * @param User $user
2175          * @param Revision $rev
2176          * @param Revision $title
2177          * @return string HTML fragment
2178          */
2179         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2180                 $canHide = $user->isAllowed( 'deleterevision' );
2181                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2182                         return '';
2183                 }
2184
2185                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2186                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2187                 } else {
2188                         if ( $rev->getId() ) {
2189                                 // RevDelete links using revision ID are stable across
2190                                 // page deletion and undeletion; use when possible.
2191                                 $query = array(
2192                                         'type' => 'revision',
2193                                         'target' => $title->getPrefixedDBkey(),
2194                                         'ids' => $rev->getId()
2195                                 );
2196                         } else {
2197                                 // Older deleted entries didn't save a revision ID.
2198                                 // We have to refer to these by timestamp, ick!
2199                                 $query = array(
2200                                         'type' => 'archive',
2201                                         'target' => $title->getPrefixedDBkey(),
2202                                         'ids' => $rev->getTimestamp()
2203                                 );
2204                         }
2205                         return Linker::revDeleteLink( $query,
2206                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2207                 }
2208         }
2209
2210         /**
2211          * Creates a (show/hide) link for deleting revisions/log entries
2212          *
2213          * @param array $query query parameters to be passed to link()
2214          * @param $restricted Boolean: set to true to use a "<strong>" instead of a "<span>"
2215          * @param $delete Boolean: set to true to use (show/hide) rather than (show)
2216          *
2217          * @return String: HTML "<a>" link to Special:Revisiondelete, wrapped in a
2218          * span to allow for customization of appearance with CSS
2219          */
2220         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
2221                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2222                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2223                 $html = wfMessage( $msgKey )->escaped();
2224                 $tag = $restricted ? 'strong' : 'span';
2225                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
2226                 return Xml::tags( $tag, array( 'class' => 'mw-revdelundel-link' ), wfMessage( 'parentheses' )->rawParams( $link )->escaped() );
2227         }
2228
2229         /**
2230          * Creates a dead (show/hide) link for deleting revisions/log entries
2231          *
2232          * @param $delete Boolean: set to true to use (show/hide) rather than (show)
2233          *
2234          * @return string HTML text wrapped in a span to allow for customization
2235          * of appearance with CSS
2236          */
2237         public static function revDeleteLinkDisabled( $delete = true ) {
2238                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2239                 $html = wfMessage( $msgKey )->escaped();
2240                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2241                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
2242         }
2243
2244         /* Deprecated methods */
2245
2246         /**
2247          * @deprecated since 1.16 Use link()
2248          *
2249          * This function is a shortcut to makeBrokenLinkObj(Title::newFromText($title),...). Do not call
2250          * it if you already have a title object handy. See makeBrokenLinkObj for further documentation.
2251          *
2252          * @param string $title The text of the title
2253          * @param string $text Link text
2254          * @param string $query Optional query part
2255          * @param string $trail Optional trail. Alphabetic characters at the start of this string will
2256          *               be included in the link text. Other characters will be appended after
2257          *               the end of the link.
2258          * @return string
2259          */
2260         static function makeBrokenLink( $title, $text = '', $query = '', $trail = '' ) {
2261                 wfDeprecated( __METHOD__, '1.16' );
2262
2263                 $nt = Title::newFromText( $title );
2264                 if ( $nt instanceof Title ) {
2265                         return self::makeBrokenLinkObj( $nt, $text, $query, $trail );
2266                 } else {
2267                         wfDebug( 'Invalid title passed to self::makeBrokenLink(): "' . $title . "\"\n" );
2268                         return $text == '' ? $title : $text;
2269                 }
2270         }
2271
2272         /**
2273          * @deprecated since 1.16 Use link(); warnings since 1.21
2274          *
2275          * Make a link for a title which may or may not be in the database. If you need to
2276          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
2277          * call to this will result in a DB query.
2278          *
2279          * @param $nt     Title: the title object to make the link from, e.g. from
2280          *                      Title::newFromText.
2281          * @param $text  String: link text
2282          * @param string $query optional query part
2283          * @param string $trail optional trail. Alphabetic characters at the start of this string will
2284          *                      be included in the link text. Other characters will be appended after
2285          *                      the end of the link.
2286          * @param string $prefix optional prefix. As trail, only before instead of after.
2287          * @return string
2288          */
2289         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2290                 wfDeprecated( __METHOD__, '1.21' );
2291
2292                 wfProfileIn( __METHOD__ );
2293                 $query = wfCgiToArray( $query );
2294                 list( $inside, $trail ) = self::splitTrail( $trail );
2295                 if ( $text === '' ) {
2296                         $text = self::linkText( $nt );
2297                 }
2298
2299                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
2300
2301                 wfProfileOut( __METHOD__ );
2302                 return $ret;
2303         }
2304
2305         /**
2306          * @deprecated since 1.16 Use link(); warnings since 1.21
2307          *
2308          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
2309          * it doesn't have to do a database query. It's also valid for interwiki titles and special
2310          * pages.
2311          *
2312          * @param $title  Title object of target page
2313          * @param $text   String: text to replace the title
2314          * @param $query  String: link target
2315          * @param $trail  String: text after link
2316          * @param string $prefix text before link text
2317          * @param string $aprops extra attributes to the a-element
2318          * @param $style  String: style to apply - if empty, use getInternalLinkAttributesObj instead
2319          * @return string the a-element
2320          */
2321         static function makeKnownLinkObj(
2322                 $title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
2323         ) {
2324                 wfDeprecated( __METHOD__, '1.21' );
2325
2326                 wfProfileIn( __METHOD__ );
2327
2328                 if ( $text == '' ) {
2329                         $text = self::linkText( $title );
2330                 }
2331                 $attribs = Sanitizer::mergeAttributes(
2332                         Sanitizer::decodeTagAttributes( $aprops ),
2333                         Sanitizer::decodeTagAttributes( $style )
2334                 );
2335                 $query = wfCgiToArray( $query );
2336                 list( $inside, $trail ) = self::splitTrail( $trail );
2337
2338                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
2339                         array( 'known', 'noclasses' ) ) . $trail;
2340
2341                 wfProfileOut( __METHOD__ );
2342                 return $ret;
2343         }
2344
2345         /**
2346          * @deprecated since 1.16 Use link()
2347          *
2348          * Make a red link to the edit page of a given title.
2349          *
2350          * @param $title Title object of the target page
2351          * @param $text  String: Link text
2352          * @param string $query Optional query part
2353          * @param string $trail Optional trail. Alphabetic characters at the start of this string will
2354          *                      be included in the link text. Other characters will be appended after
2355          *                      the end of the link.
2356          * @param string $prefix Optional prefix
2357          * @return string
2358          */
2359         static function makeBrokenLinkObj( $title, $text = '', $query = '', $trail = '', $prefix = '' ) {
2360                 wfDeprecated( __METHOD__, '1.16' );
2361
2362                 wfProfileIn( __METHOD__ );
2363
2364                 list( $inside, $trail ) = self::splitTrail( $trail );
2365                 if ( $text === '' ) {
2366                         $text = self::linkText( $title );
2367                 }
2368
2369                 $ret = self::link( $title, "$prefix$text$inside", array(),
2370                         wfCgiToArray( $query ), 'broken' ) . $trail;
2371
2372                 wfProfileOut( __METHOD__ );
2373                 return $ret;
2374         }
2375
2376         /**
2377          * @deprecated since 1.16 Use link()
2378          *
2379          * Make a coloured link.
2380          *
2381          * @param $nt Title object of the target page
2382          * @param $colour Integer: colour of the link
2383          * @param $text   String:  link text
2384          * @param $query  String:  optional query part
2385          * @param $trail  String:  optional trail. Alphabetic characters at the start of this string will
2386          *                      be included in the link text. Other characters will be appended after
2387          *                      the end of the link.
2388          * @param string $prefix Optional prefix
2389          * @return string
2390          */
2391         static function makeColouredLinkObj( $nt, $colour, $text = '', $query = '', $trail = '', $prefix = '' ) {
2392                 wfDeprecated( __METHOD__, '1.16' );
2393
2394                 if ( $colour != '' ) {
2395                         $style = self::getInternalLinkAttributesObj( $nt, $text, $colour );
2396                 } else {
2397                         $style = '';
2398                 }
2399                 return self::makeKnownLinkObj( $nt, $text, $query, $trail, $prefix, '', $style );
2400         }
2401
2402         /**
2403          * Returns the attributes for the tooltip and access key.
2404          * @return array
2405          */
2406         public static function tooltipAndAccesskeyAttribs( $name ) {
2407                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2408                 # no attribute" instead of "output '' as value for attribute", this
2409                 # would be three lines.
2410                 $attribs = array(
2411                         'title' => self::titleAttrib( $name, 'withaccess' ),
2412                         'accesskey' => self::accesskey( $name )
2413                 );
2414                 if ( $attribs['title'] === false ) {
2415                         unset( $attribs['title'] );
2416                 }
2417                 if ( $attribs['accesskey'] === false ) {
2418                         unset( $attribs['accesskey'] );
2419                 }
2420                 return $attribs;
2421         }
2422
2423         /**
2424          * Returns raw bits of HTML, use titleAttrib()
2425          * @return null|string
2426          */
2427         public static function tooltip( $name, $options = null ) {
2428                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2429                 # no attribute" instead of "output '' as value for attribute", this
2430                 # would be two lines.
2431                 $tooltip = self::titleAttrib( $name, $options );
2432                 if ( $tooltip === false ) {
2433                         return '';
2434                 }
2435                 return Xml::expandAttributes( array(
2436                         'title' => $tooltip
2437                 ) );
2438         }
2439 }
2440
2441 /**
2442  * @since 1.18
2443  */
2444 class DummyLinker {
2445
2446         /**
2447          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2448          * into static calls to the new Linker for backwards compatibility.
2449          *
2450          * @param string $fname Name of called method
2451          * @param array $args Arguments to the method
2452          * @return mixed
2453          */
2454         public function __call( $fname, $args ) {
2455                 return call_user_func_array( array( 'Linker', $fname ), $args );
2456         }
2457 }