includes/Linker.php

   1 <?php
   2 /**
   3  * Methods to make links and related items.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Some internal bits split of from Skin.php. These functions are used
  25  * for primarily page content: links, embedded images, table of contents. Links
  26  * are also used in the skin.
  27  *
  28  * @todo turn this into a legacy interface for HtmlPageLinkRenderer and similar services.
  29  *
  30  * @ingroup Skins
  31  */
  32 class Linker {
  33         /**
  34          * Flags for userToolLinks()
  35          */
  36         const TOOL_LINKS_NOBLOCK = 1;
  37         const TOOL_LINKS_EMAIL = 2;
  38
  39         /**
  40          * Get the appropriate HTML attributes to add to the "a" element of an interwiki link.
  41          *
  42          * @deprecated since 1.25
  43          *
  44          * @param string $title The title text for the link, URL-encoded (???) but
  45          *   not HTML-escaped
  46          * @param string $unused Unused
  47          * @param string $class The contents of the class attribute; if an empty
  48          *   string is passed, which is the default value, defaults to 'external'.
  49          * @return string
  50          */
  51         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  52                 global $wgContLang;
  53
  54                 wfDeprecated( __METHOD__, '1.25' );
  55
  56                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  57                 # getExternalLinkAttributes, why?
  58                 $title = urldecode( $title );
  59                 $title = $wgContLang->checkTitleEncoding( $title );
  60                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  61
  62                 return self::getLinkAttributesInternal( $title, $class );
  63         }
  64
  65         /**
  66          * Get the appropriate HTML attributes to add to the "a" element of an internal link.
  67          *
  68          * @deprecated since 1.25
  69          *
  70          * @param string $title The title text for the link, URL-encoded (???) but
  71          *   not HTML-escaped
  72          * @param string $unused Unused
  73          * @param string $class The contents of the class attribute, default none
  74          * @return string
  75          */
  76         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  77                 wfDeprecated( __METHOD__, '1.25' );
  78
  79                 $title = urldecode( $title );
  80                 $title = str_replace( '_', ' ', $title );
  81                 return self::getLinkAttributesInternal( $title, $class );
  82         }
  83
  84         /**
  85          * Get the appropriate HTML attributes to add to the "a" element of an internal
  86          * link, given the Title object for the page we want to link to.
  87          *
  88          * @deprecated since 1.25
  89          *
  90          * @param Title $nt
  91          * @param string $unused Unused
  92          * @param string $class The contents of the class attribute, default none
  93          * @param string|bool $title Optional (unescaped) string to use in the title
  94          *   attribute; if false, default to the name of the page we're linking to
  95          * @return string
  96          */
  97         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
  98                 wfDeprecated( __METHOD__, '1.25' );
  99
 100                 if ( $title === false ) {
 101                         $title = $nt->getPrefixedText();
 102                 }
 103                 return self::getLinkAttributesInternal( $title, $class );
 104         }
 105
 106         /**
 107          * Common code for getLinkAttributesX functions
 108          *
 109          * @deprecated since 1.25
 110          *
 111          * @param string $title
 112          * @param string $class
 113          *
 114          * @return string
 115          */
 116         private static function getLinkAttributesInternal( $title, $class ) {
 117                 wfDeprecated( __METHOD__, '1.25' );
 118
 119                 $title = htmlspecialchars( $title );
 120                 $class = htmlspecialchars( $class );
 121                 $r = '';
 122                 if ( $class != '' ) {
 123                         $r .= " class=\"$class\"";
 124                 }
 125                 if ( $title != '' ) {
 126                         $r .= " title=\"$title\"";
 127                 }
 128                 return $r;
 129         }
 130
 131         /**
 132          * Return the CSS colour of a known link
 133          *
 134          * @param Title $t
 135          * @param int $threshold User defined threshold
 136          * @return string CSS class
 137          */
 138         public static function getLinkColour( $t, $threshold ) {
 139                 $colour = '';
 140                 if ( $t->isRedirect() ) {
 141                         # Page is a redirect
 142                         $colour = 'mw-redirect';
 143                 } elseif ( $threshold > 0 && $t->isContentPage() &&
 144                         $t->exists() && $t->getLength() < $threshold
 145                 ) {
 146                         # Page is a stub
 147                         $colour = 'stub';
 148                 }
 149                 return $colour;
 150         }
 151
 152         /**
 153          * This function returns an HTML link to the given target.  It serves a few
 154          * purposes:
 155          *   1) If $target is a Title, the correct URL to link to will be figured
 156          *      out automatically.
 157          *   2) It automatically adds the usual classes for various types of link
 158          *      targets: "new" for red links, "stub" for short articles, etc.
 159          *   3) It escapes all attribute values safely so there's no risk of XSS.
 160          *   4) It provides a default tooltip if the target is a Title (the page
 161          *      name of the target).
 162          * link() replaces the old functions in the makeLink() family.
 163          *
 164          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 165          *
 166          * @param Title $target Can currently only be a Title, but this may
 167          *   change to support Images, literal URLs, etc.
 168          * @param string $html The HTML contents of the <a> element, i.e.,
 169          *   the link text.  This is raw HTML and will not be escaped.  If null,
 170          *   defaults to the prefixed text of the Title; or if the Title is just a
 171          *   fragment, the contents of the fragment.
 172          * @param array $customAttribs A key => value array of extra HTML attributes,
 173          *   such as title and class.  (href is ignored.)  Classes will be
 174          *   merged with the default classes, while other attributes will replace
 175          *   default attributes.  All passed attribute values will be HTML-escaped.
 176          *   A false attribute value means to suppress that attribute.
 177          * @param array $query The query string to append to the URL
 178          *   you're linking to, in key => value array form.  Query keys and values
 179          *   will be URL-encoded.
 180          * @param string|array $options String or array of strings:
 181          *     'known': Page is known to exist, so don't check if it does.
 182          *     'broken': Page is known not to exist, so don't check if it does.
 183          *     'noclasses': Don't add any classes automatically (includes "new",
 184          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
 185          *       provided, if any, so you get a simple blue link with no funny i-
 186          *       cons.
 187          *     'forcearticlepath': Use the article path always, even with a querystring.
 188          *       Has compatibility issues on some setups, so avoid wherever possible.
 189          *     'http': Force a full URL with http:// as the scheme.
 190          *     'https': Force a full URL with https:// as the scheme.
 191          * @return string HTML <a> attribute
 192          */
 193         public static function link(
 194                 $target, $html = null, $customAttribs = array(), $query = array(), $options = array()
 195         ) {
 196                 if ( !$target instanceof Title ) {
 197                         wfWarn( __METHOD__ . ': Requires $target to be a Title object.', 2 );
 198                         return "<!-- ERROR -->$html";
 199                 }
 200                 wfProfileIn( __METHOD__ );
 201
 202                 if ( is_string( $query ) ) {
 203                         // some functions withing core using this still hand over query strings
 204                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
 205                         $query = wfCgiToArray( $query );
 206                 }
 207                 $options = (array)$options;
 208
 209                 $dummy = new DummyLinker; // dummy linker instance for bc on the hooks
 210
 211                 $ret = null;
 212                 if ( !wfRunHooks( 'LinkBegin', 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 ) && !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          * @see Linker::link
 264          * @return string
 265          */
 266         public static function linkKnown(
 267                 $target, $html = null, $customAttribs = array(),
 268                 $query = array(), $options = array( 'known', 'noclasses' )
 269         ) {
 270                 return self::link( $target, $html, $customAttribs, $query, $options );
 271         }
 272
 273         /**
 274          * Returns the Url used to link to a Title
 275          *
 276          * @param Title $target
 277          * @param array $query Query parameters
 278          * @param array $options
 279          * @return string
 280          */
 281         private static function linkUrl( $target, $query, $options ) {
 282                 wfProfileIn( __METHOD__ );
 283                 # We don't want to include fragments for broken links, because they
 284                 # generally make no sense.
 285                 if ( in_array( 'broken', $options ) && $target->hasFragment() ) {
 286                         $target = clone $target;
 287                         $target->setFragment( '' );
 288                 }
 289
 290                 # If it's a broken link, add the appropriate query pieces, unless
 291                 # there's already an action specified, or unless 'edit' makes no sense
 292                 # (i.e., for a nonexistent special page).
 293                 if ( in_array( 'broken', $options ) && empty( $query['action'] )
 294                         && !$target->isSpecialPage() ) {
 295                         $query['action'] = 'edit';
 296                         $query['redlink'] = '1';
 297                 }
 298
 299                 if ( in_array( 'http', $options ) ) {
 300                         $proto = PROTO_HTTP;
 301                 } elseif ( in_array( 'https', $options ) ) {
 302                         $proto = PROTO_HTTPS;
 303                 } else {
 304                         $proto = PROTO_RELATIVE;
 305                 }
 306
 307                 $ret = $target->getLinkURL( $query, false, $proto );
 308                 wfProfileOut( __METHOD__ );
 309                 return $ret;
 310         }
 311
 312         /**
 313          * Returns the array of attributes used when linking to the Title $target
 314          *
 315          * @param Title $target
 316          * @param array $attribs
 317          * @param array $options
 318          *
 319          * @return array
 320          */
 321         private static function linkAttribs( $target, $attribs, $options ) {
 322                 wfProfileIn( __METHOD__ );
 323                 global $wgUser;
 324                 $defaults = array();
 325
 326                 if ( !in_array( 'noclasses', $options ) ) {
 327                         wfProfileIn( __METHOD__ . '-getClasses' );
 328                         # Now build the classes.
 329                         $classes = array();
 330
 331                         if ( in_array( 'broken', $options ) ) {
 332                                 $classes[] = 'new';
 333                         }
 334
 335                         if ( $target->isExternal() ) {
 336                                 $classes[] = 'extiw';
 337                         }
 338
 339                         if ( !in_array( 'broken', $options ) ) { # Avoid useless calls to LinkCache (see r50387)
 340                                 $colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
 341                                 if ( $colour !== '' ) {
 342                                         $classes[] = $colour; # mw-redirect or stub
 343                                 }
 344                         }
 345                         if ( $classes != array() ) {
 346                                 $defaults['class'] = implode( ' ', $classes );
 347                         }
 348                         wfProfileOut( __METHOD__ . '-getClasses' );
 349                 }
 350
 351                 # Get a default title attribute.
 352                 if ( $target->getPrefixedText() == '' ) {
 353                         # A link like [[#Foo]].  This used to mean an empty title
 354                         # attribute, but that's silly.  Just don't output a title.
 355                 } elseif ( in_array( 'known', $options ) ) {
 356                         $defaults['title'] = $target->getPrefixedText();
 357                 } else {
 358                         $defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )->text();
 359                 }
 360
 361                 # Finally, merge the custom attribs with the default ones, and iterate
 362                 # over that, deleting all "false" attributes.
 363                 $ret = array();
 364                 $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
 365                 foreach ( $merged as $key => $val ) {
 366                         # A false value suppresses the attribute, and we don't want the
 367                         # href attribute to be overridden.
 368                         if ( $key != 'href' && $val !== false ) {
 369                                 $ret[$key] = $val;
 370                         }
 371                 }
 372                 wfProfileOut( __METHOD__ );
 373                 return $ret;
 374         }
 375
 376         /**
 377          * Default text of the links to the Title $target
 378          *
 379          * @param Title $target
 380          *
 381          * @return string
 382          */
 383         private static function linkText( $target ) {
 384                 if ( !$target instanceof Title ) {
 385                         wfWarn( __METHOD__ . ': Requires $target to be a Title object.' );
 386                         return '';
 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->hasFragment() ) {
 391                         return htmlspecialchars( $target->getFragment() );
 392                 }
 393
 394                 return htmlspecialchars( $target->getPrefixedText() );
 395         }
 396
 397         /**
 398          * Make appropriate markup for a link to the current article. This is
 399          * currently rendered as the bold link text. The calling sequence is the
 400          * same as the other make*LinkObj static functions, despite $query not
 401          * being used.
 402          *
 403          * @param Title $nt
 404          * @param string $html [optional]
 405          * @param string $query [optional]
 406          * @param string $trail [optional]
 407          * @param string $prefix [optional]
 408          *
 409          * @return string
 410          */
 411         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 412                 $ret = "<strong class=\"selflink\">{$prefix}{$html}</strong>{$trail}";
 413                 if ( !wfRunHooks( 'SelfLinkBegin', array( $nt, &$html, &$trail, &$prefix, &$ret ) ) ) {
 414                         return $ret;
 415                 }
 416
 417                 if ( $html == '' ) {
 418                         $html = htmlspecialchars( $nt->getPrefixedText() );
 419                 }
 420                 list( $inside, $trail ) = self::splitTrail( $trail );
 421                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 422         }
 423
 424         /**
 425          * Get a message saying that an invalid title was encountered.
 426          * This should be called after a method like Title::makeTitleSafe() returned
 427          * a value indicating that the title object is invalid.
 428          *
 429          * @param IContextSource $context Context to use to get the messages
 430          * @param int $namespace Namespace number
 431          * @param string $title Text of the title, without the namespace part
 432          * @return string
 433          */
 434         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 435                 global $wgContLang;
 436
 437                 // First we check whether the namespace exists or not.
 438                 if ( MWNamespace::exists( $namespace ) ) {
 439                         if ( $namespace == NS_MAIN ) {
 440                                 $name = $context->msg( 'blanknamespace' )->text();
 441                         } else {
 442                                 $name = $wgContLang->getFormattedNsText( $namespace );
 443                         }
 444                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 445                 } else {
 446                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 447                 }
 448         }
 449
 450         /**
 451          * @param Title $title
 452          * @return Title
 453          */
 454         static function normaliseSpecialPage( Title $title ) {
 455                 if ( $title->isSpecialPage() ) {
 456                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 457                         if ( !$name ) {
 458                                 return $title;
 459                         }
 460                         $ret = SpecialPage::getTitleFor( $name, $subpage, $title->getFragment() );
 461                         return $ret;
 462                 } else {
 463                         return $title;
 464                 }
 465         }
 466
 467         /**
 468          * Returns the filename part of an url.
 469          * Used as alternative text for external images.
 470          *
 471          * @param string $url
 472          *
 473          * @return string
 474          */
 475         private static function fnamePart( $url ) {
 476                 $basename = strrchr( $url, '/' );
 477                 if ( false === $basename ) {
 478                         $basename = $url;
 479                 } else {
 480                         $basename = substr( $basename, 1 );
 481                 }
 482                 return $basename;
 483         }
 484
 485         /**
 486          * Return the code for images which were added via external links,
 487          * via Parser::maybeMakeExternalImage().
 488          *
 489          * @param string $url
 490          * @param string $alt
 491          *
 492          * @return string
 493          */
 494         public static function makeExternalImage( $url, $alt = '' ) {
 495                 if ( $alt == '' ) {
 496                         $alt = self::fnamePart( $url );
 497                 }
 498                 $img = '';
 499                 $success = wfRunHooks( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
 500                 if ( !$success ) {
 501                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 502                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 503                         return $img;
 504                 }
 505                 return Html::element( 'img',
 506                         array(
 507                                 'src' => $url,
 508                                 'alt' => $alt ) );
 509         }
 510
 511         /**
 512          * Given parameters derived from [[Image:Foo|options...]], generate the
 513          * HTML that that syntax inserts in the page.
 514          *
 515          * @param Parser $parser
 516          * @param Title $title Title object of the file (not the currently viewed page)
 517          * @param File $file File object, or false if it doesn't exist
 518          * @param array $frameParams Associative array of parameters external to the media handler.
 519          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 520          *     will often be false.
 521          *          thumbnail       If present, downscale and frame
 522          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 523          *          framed          Shows image in original size in a frame
 524          *          frameless       Downscale but don't frame
 525          *          upright         If present, tweak default sizes for portrait orientation
 526          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 527          *          border          If present, show a border around the image
 528          *          align           Horizontal alignment (left, right, center, none)
 529          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 530          *                          bottom, text-bottom)
 531          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 532          *          class           HTML for image classes. Plain text.
 533          *          caption         HTML for image caption.
 534          *          link-url        URL to link to
 535          *          link-title      Title object to link to
 536          *          link-target     Value for the target attribute, only with link-url
 537          *          no-link         Boolean, suppress description link
 538          *
 539          * @param array $handlerParams Associative array of media handler parameters, to be passed
 540          *       to transform(). Typical keys are "width" and "page".
 541          * @param string|bool $time Timestamp of the file, set as false for current
 542          * @param string $query Query params for desc url
 543          * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
 544          * @since 1.20
 545          * @return string HTML for an image, with links, wrappers, etc.
 546          */
 547         public static function makeImageLink( Parser $parser, Title $title,
 548                 $file, $frameParams = array(), $handlerParams = array(), $time = false,
 549                 $query = "", $widthOption = null
 550         ) {
 551                 $res = null;
 552                 $dummy = new DummyLinker;
 553                 if ( !wfRunHooks( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
 554                         &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
 555                         return $res;
 556                 }
 557
 558                 if ( $file && !$file->allowInlineDisplay() ) {
 559                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 560                         return self::link( $title );
 561                 }
 562
 563                 // Shortcuts
 564                 $fp =& $frameParams;
 565                 $hp =& $handlerParams;
 566
 567                 // Clean up parameters
 568                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 569                 if ( !isset( $fp['align'] ) ) {
 570                         $fp['align'] = '';
 571                 }
 572                 if ( !isset( $fp['alt'] ) ) {
 573                         $fp['alt'] = '';
 574                 }
 575                 if ( !isset( $fp['title'] ) ) {
 576                         $fp['title'] = '';
 577                 }
 578                 if ( !isset( $fp['class'] ) ) {
 579                         $fp['class'] = '';
 580                 }
 581
 582                 $prefix = $postfix = '';
 583
 584                 if ( 'center' == $fp['align'] ) {
 585                         $prefix = '<div class="center">';
 586                         $postfix = '</div>';
 587                         $fp['align'] = 'none';
 588                 }
 589                 if ( $file && !isset( $hp['width'] ) ) {
 590                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 591                                 // If its a vector image, and user only specifies height
 592                                 // we don't want it to be limited by its "normal" width.
 593                                 global $wgSVGMaxSize;
 594                                 $hp['width'] = $wgSVGMaxSize;
 595                         } else {
 596                                 $hp['width'] = $file->getWidth( $page );
 597                         }
 598
 599                         if ( isset( $fp['thumbnail'] )
 600                                 || isset( $fp['manualthumb'] )
 601                                 || isset( $fp['framed'] )
 602                                 || isset( $fp['frameless'] )
 603                                 || !$hp['width']
 604                         ) {
 605                                 global $wgThumbLimits, $wgThumbUpright;
 606
 607                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 608                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 609                                 }
 610
 611                                 // Reduce width for upright images when parameter 'upright' is used
 612                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 613                                         $fp['upright'] = $wgThumbUpright;
 614                                 }
 615
 616                                 // For caching health: If width scaled down due to upright
 617                                 // parameter, round to full __0 pixel to avoid the creation of a
 618                                 // lot of odd thumbs.
 619                                 $prefWidth = isset( $fp['upright'] ) ?
 620                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 621                                         $wgThumbLimits[$widthOption];
 622
 623                                 // Use width which is smaller: real image width or user preference width
 624                                 // Unless image is scalable vector.
 625                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 626                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 627                                         $hp['width'] = $prefWidth;
 628                                 }
 629                         }
 630                 }
 631
 632                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 633                         # Create a thumbnail. Alignment depends on the writing direction of
 634                         # the page content language (right-aligned for LTR languages,
 635                         # left-aligned for RTL languages)
 636                         #
 637                         # If a thumbnail width has not been provided, it is set
 638                         # to the default user option as specified in Language*.php
 639                         if ( $fp['align'] == '' ) {
 640                                 $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 641                         }
 642                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 643                 }
 644
 645                 if ( $file && isset( $fp['frameless'] ) ) {
 646                         $srcWidth = $file->getWidth( $page );
 647                         # For "frameless" option: do not present an image bigger than the
 648                         # source (for bitmap-style images). This is the same behavior as the
 649                         # "thumb" option does it already.
 650                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 651                                 $hp['width'] = $srcWidth;
 652                         }
 653                 }
 654
 655                 if ( $file && isset( $hp['width'] ) ) {
 656                         # Create a resized image, without the additional thumbnail features
 657                         $thumb = $file->transform( $hp );
 658                 } else {
 659                         $thumb = false;
 660                 }
 661
 662                 if ( !$thumb ) {
 663                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 664                 } else {
 665                         self::processResponsiveImages( $file, $thumb, $hp );
 666                         $params = array(
 667                                 'alt' => $fp['alt'],
 668                                 'title' => $fp['title'],
 669                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 670                                 'img-class' => $fp['class'] );
 671                         if ( isset( $fp['border'] ) ) {
 672                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 673                         }
 674                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 675
 676                         $s = $thumb->toHtml( $params );
 677                 }
 678                 if ( $fp['align'] != '' ) {
 679                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 680                 }
 681                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 682         }
 683
 684         /**
 685          * See makeImageLink()
 686          * When this function is removed, remove if( $parser instanceof Parser ) check there too
 687          * @deprecated since 1.20
 688          */
 689         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 690                 $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
 691                 return self::makeImageLink( null, $title, $file, $frameParams,
 692                         $handlerParams, $time, $query, $widthOption );
 693         }
 694
 695         /**
 696          * Get the link parameters for MediaTransformOutput::toHtml() from given
 697          * frame parameters supplied by the Parser.
 698          * @param array $frameParams The frame parameters
 699          * @param string $query An optional query string to add to description page links
 700          * @param Parser|null $parser
 701          * @return array
 702          */
 703         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 704                 $mtoParams = array();
 705                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 706                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 707                         if ( isset( $frameParams['link-target'] ) ) {
 708                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 709                         }
 710                         if ( $parser ) {
 711                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 712                                 foreach ( $extLinkAttrs as $name => $val ) {
 713                                         // Currently could include 'rel' and 'target'
 714                                         $mtoParams['parser-extlink-' . $name] = $val;
 715                                 }
 716                         }
 717                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 718                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 719                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 720                         // No link
 721                 } else {
 722                         $mtoParams['desc-link'] = true;
 723                         $mtoParams['desc-query'] = $query;
 724                 }
 725                 return $mtoParams;
 726         }
 727
 728         /**
 729          * Make HTML for a thumbnail including image, border and caption
 730          * @param Title $title
 731          * @param File|bool $file File object or false if it doesn't exist
 732          * @param string $label
 733          * @param string $alt
 734          * @param string $align
 735          * @param array $params
 736          * @param bool $framed
 737          * @param string $manualthumb
 738          * @return string
 739          */
 740         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 741                 $align = 'right', $params = array(), $framed = false, $manualthumb = ""
 742         ) {
 743                 $frameParams = array(
 744                         'alt' => $alt,
 745                         'caption' => $label,
 746                         'align' => $align
 747                 );
 748                 if ( $framed ) {
 749                         $frameParams['framed'] = true;
 750                 }
 751                 if ( $manualthumb ) {
 752                         $frameParams['manualthumb'] = $manualthumb;
 753                 }
 754                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 755         }
 756
 757         /**
 758          * @param Title $title
 759          * @param File $file
 760          * @param array $frameParams
 761          * @param array $handlerParams
 762          * @param bool $time
 763          * @param string $query
 764          * @return string
 765          */
 766         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 767                 $handlerParams = array(), $time = false, $query = ""
 768         ) {
 769                 $exists = $file && $file->exists();
 770
 771                 # Shortcuts
 772                 $fp =& $frameParams;
 773                 $hp =& $handlerParams;
 774
 775                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 776                 if ( !isset( $fp['align'] ) ) {
 777                         $fp['align'] = 'right';
 778                 }
 779                 if ( !isset( $fp['alt'] ) ) {
 780                         $fp['alt'] = '';
 781                 }
 782                 if ( !isset( $fp['title'] ) ) {
 783                         $fp['title'] = '';
 784                 }
 785                 if ( !isset( $fp['caption'] ) ) {
 786                         $fp['caption'] = '';
 787                 }
 788
 789                 if ( empty( $hp['width'] ) ) {
 790                         // Reduce width for upright images when parameter 'upright' is used
 791                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 792                 }
 793                 $thumb = false;
 794                 $noscale = false;
 795                 $manualthumb = false;
 796
 797                 if ( !$exists ) {
 798                         $outerWidth = $hp['width'] + 2;
 799                 } else {
 800                         if ( isset( $fp['manualthumb'] ) ) {
 801                                 # Use manually specified thumbnail
 802                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 803                                 if ( $manual_title ) {
 804                                         $manual_img = wfFindFile( $manual_title );
 805                                         if ( $manual_img ) {
 806                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 807                                                 $manualthumb = true;
 808                                         } else {
 809                                                 $exists = false;
 810                                         }
 811                                 }
 812                         } elseif ( isset( $fp['framed'] ) ) {
 813                                 // Use image dimensions, don't scale
 814                                 $thumb = $file->getUnscaledThumb( $hp );
 815                                 $noscale = true;
 816                         } else {
 817                                 # Do not present an image bigger than the source, for bitmap-style images
 818                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 819                                 $srcWidth = $file->getWidth( $page );
 820                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 821                                         $hp['width'] = $srcWidth;
 822                                 }
 823                                 $thumb = $file->transform( $hp );
 824                         }
 825
 826                         if ( $thumb ) {
 827                                 $outerWidth = $thumb->getWidth() + 2;
 828                         } else {
 829                                 $outerWidth = $hp['width'] + 2;
 830                         }
 831                 }
 832
 833                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 834                 # So we don't need to pass it here in $query. However, the URL for the
 835                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 836                 $url = $title->getLocalURL( $query );
 837                 if ( $page ) {
 838                         $url = wfAppendQuery( $url, array( 'page' => $page ) );
 839                 }
 840                 if ( $manualthumb
 841                         && !isset( $fp['link-title'] )
 842                         && !isset( $fp['link-url'] )
 843                         && !isset( $fp['no-link'] ) ) {
 844                         $fp['link-url'] = $url;
 845                 }
 846
 847                 $s = "<div class=\"thumb t{$fp['align']}\">"
 848                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 849
 850                 if ( !$exists ) {
 851                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 852                         $zoomIcon = '';
 853                 } elseif ( !$thumb ) {
 854                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 855                         $zoomIcon = '';
 856                 } else {
 857                         if ( !$noscale && !$manualthumb ) {
 858                                 self::processResponsiveImages( $file, $thumb, $hp );
 859                         }
 860                         $params = array(
 861                                 'alt' => $fp['alt'],
 862                                 'title' => $fp['title'],
 863                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
 864                                         ? $fp['class'] . ' '
 865                                         : '' ) . 'thumbimage'
 866                         );
 867                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 868                         $s .= $thumb->toHtml( $params );
 869                         if ( isset( $fp['framed'] ) ) {
 870                                 $zoomIcon = "";
 871                         } else {
 872                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 873                                         Html::rawElement( 'a', array(
 874                                                 'href' => $url,
 875                                                 'class' => 'internal',
 876                                                 'title' => wfMessage( 'thumbnail-more' )->text() ),
 877                                                 "" ) );
 878                         }
 879                 }
 880                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 881                 return str_replace( "\n", ' ', $s );
 882         }
 883
 884         /**
 885          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 886          * applicable.
 887          *
 888          * @param File $file
 889          * @param MediaTransformOutput $thumb
 890          * @param array $hp Image parameters
 891          */
 892         public static function processResponsiveImages( $file, $thumb, $hp ) {
 893                 global $wgResponsiveImages;
 894                 if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
 895                         $hp15 = $hp;
 896                         $hp15['width'] = round( $hp['width'] * 1.5 );
 897                         $hp20 = $hp;
 898                         $hp20['width'] = $hp['width'] * 2;
 899                         if ( isset( $hp['height'] ) ) {
 900                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 901                                 $hp20['height'] = $hp['height'] * 2;
 902                         }
 903
 904                         $thumb15 = $file->transform( $hp15 );
 905                         $thumb20 = $file->transform( $hp20 );
 906                         if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
 907                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 908                         }
 909                         if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
 910                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 911                         }
 912                 }
 913         }
 914
 915         /**
 916          * Make a "broken" link to an image
 917          *
 918          * @param Title $title
 919          * @param string $label Link label (plain text)
 920          * @param string $query Query string
 921          * @param string $unused1 Unused parameter kept for b/c
 922          * @param string $unused2 Unused parameter kept for b/c
 923          * @param bool $time A file of a certain timestamp was requested
 924          * @return string
 925          */
 926         public static function makeBrokenImageLinkObj( $title, $label = '',
 927                 $query = '', $unused1 = '', $unused2 = '', $time = false
 928         ) {
 929                 if ( !$title instanceof Title ) {
 930                         wfWarn( __METHOD__ . ': Requires $title to be a Title object.' );
 931                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 932                 }
 933
 934                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 935                 wfProfileIn( __METHOD__ );
 936                 if ( $label == '' ) {
 937                         $label = $title->getPrefixedText();
 938                 }
 939                 $encLabel = htmlspecialchars( $label );
 940                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 941
 942                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 943                         && !$currentExists
 944                 ) {
 945                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 946
 947                         if ( $redir ) {
 948                                 wfProfileOut( __METHOD__ );
 949                                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 950                         }
 951
 952                         $href = self::getUploadUrl( $title, $query );
 953
 954                         wfProfileOut( __METHOD__ );
 955                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 956                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 957                                 $encLabel . '</a>';
 958                 }
 959
 960                 wfProfileOut( __METHOD__ );
 961                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 962         }
 963
 964         /**
 965          * Get the URL to upload a certain file
 966          *
 967          * @param Title $destFile Title object of the file to upload
 968          * @param string $query Urlencoded query string to prepend
 969          * @return string Urlencoded URL
 970          */
 971         protected static function getUploadUrl( $destFile, $query = '' ) {
 972                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 973                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 974                 if ( $query != '' ) {
 975                         $q .= '&' . $query;
 976                 }
 977
 978                 if ( $wgUploadMissingFileUrl ) {
 979                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 980                 } elseif ( $wgUploadNavigationUrl ) {
 981                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 982                 } else {
 983                         $upload = SpecialPage::getTitleFor( 'Upload' );
 984                         return $upload->getLocalURL( $q );
 985                 }
 986         }
 987
 988         /**
 989          * Create a direct link to a given uploaded file.
 990          *
 991          * @param Title $title
 992          * @param string $html Pre-sanitized HTML
 993          * @param string $time MW timestamp of file creation time
 994          * @return string HTML
 995          */
 996         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
 997                 $img = wfFindFile( $title, array( 'time' => $time ) );
 998                 return self::makeMediaLinkFile( $title, $img, $html );
 999         }
1000
1001         /**
1002          * Create a direct link to a given uploaded file.
1003          * This will make a broken link if $file is false.
1004          *
1005          * @param Title $title
1006          * @param File|bool $file File object or false
1007          * @param string $html Pre-sanitized HTML
1008          * @return string HTML
1009          *
1010          * @todo Handle invalid or missing images better.
1011          */
1012         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
1013                 if ( $file && $file->exists() ) {
1014                         $url = $file->getURL();
1015                         $class = 'internal';
1016                 } else {
1017                         $url = self::getUploadUrl( $title );
1018                         $class = 'new';
1019                 }
1020
1021                 $alt = $title->getText();
1022                 if ( $html == '' ) {
1023                         $html = $alt;
1024                 }
1025
1026                 $ret = '';
1027                 $attribs = array(
1028                         'href' => $url,
1029                         'class' => $class,
1030                         'title' => $alt
1031                 );
1032
1033                 if ( !wfRunHooks( 'LinkerMakeMediaLinkFile',
1034                         array( $title, $file, &$html, &$attribs, &$ret ) ) ) {
1035                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
1036                                 . "with url {$url} and text {$html} to {$ret}\n", true );
1037                         return $ret;
1038                 }
1039
1040                 return Html::rawElement( 'a', $attribs, $html );
1041         }
1042
1043         /**
1044          * Make a link to a special page given its name and, optionally,
1045          * a message key from the link text.
1046          * Usage example: Linker::specialLink( 'Recentchanges' )
1047          *
1048          * @param string $name
1049          * @param string $key
1050          * @return string
1051          */
1052         public static function specialLink( $name, $key = '' ) {
1053                 if ( $key == '' ) {
1054                         $key = strtolower( $name );
1055                 }
1056
1057                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
1058         }
1059
1060         /**
1061          * Make an external link
1062          * @param string $url URL to link to
1063          * @param string $text Text of link
1064          * @param bool $escape Do we escape the link text?
1065          * @param string $linktype Type of external link. Gets added to the classes
1066          * @param array $attribs Array of extra attributes to <a>
1067          * @param Title|null $title Title object used for title specific link attributes
1068          * @return string
1069          */
1070         public static function makeExternalLink( $url, $text, $escape = true,
1071                 $linktype = '', $attribs = array(), $title = null
1072         ) {
1073                 global $wgTitle;
1074                 $class = "external";
1075                 if ( $linktype ) {
1076                         $class .= " $linktype";
1077                 }
1078                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1079                         $class .= " {$attribs['class']}";
1080                 }
1081                 $attribs['class'] = $class;
1082
1083                 if ( $escape ) {
1084                         $text = htmlspecialchars( $text );
1085                 }
1086
1087                 if ( !$title ) {
1088                         $title = $wgTitle;
1089                 }
1090                 $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
1091                 $link = '';
1092                 $success = wfRunHooks( 'LinkerMakeExternalLink',
1093                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
1094                 if ( !$success ) {
1095                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
1096                                 . "with url {$url} and text {$text} to {$link}\n", true );
1097                         return $link;
1098                 }
1099                 $attribs['href'] = $url;
1100                 return Html::rawElement( 'a', $attribs, $text );
1101         }
1102
1103         /**
1104          * Make user link (or user contributions for unregistered users)
1105          * @param int $userId User id in database.
1106          * @param string $userName User name in database.
1107          * @param string $altUserName Text to display instead of the user name (optional)
1108          * @return string HTML fragment
1109          * @since 1.19 Method exists for a long time. $altUserName was added in 1.19.
1110          */
1111         public static function userLink( $userId, $userName, $altUserName = false ) {
1112                 $classes = 'mw-userlink';
1113                 if ( $userId == 0 ) {
1114                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1115                         if ( $altUserName === false ) {
1116                                 $altUserName = IP::prettifyIP( $userName );
1117                         }
1118                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
1119                 } else {
1120                         $page = Title::makeTitle( NS_USER, $userName );
1121                 }
1122
1123                 return self::link(
1124                         $page,
1125                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1126                         array( 'class' => $classes )
1127                 );
1128         }
1129
1130         /**
1131          * Generate standard user tool links (talk, contributions, block link, etc.)
1132          *
1133          * @param int $userId User identifier
1134          * @param string $userText User name or IP address
1135          * @param bool $redContribsWhenNoEdits Should the contributions link be
1136          *   red if the user has no edits?
1137          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
1138          *   and Linker::TOOL_LINKS_EMAIL).
1139          * @param int $edits User edit count (optional, for performance)
1140          * @return string HTML fragment
1141          */
1142         public static function userToolLinks(
1143                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1144         ) {
1145                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1146                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1147                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1148                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1149
1150                 $items = array();
1151                 if ( $talkable ) {
1152                         $items[] = self::userTalkLink( $userId, $userText );
1153                 }
1154                 if ( $userId ) {
1155                         // check if the user has an edit
1156                         $attribs = array();
1157                         if ( $redContribsWhenNoEdits ) {
1158                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1159                                         $user = User::newFromId( $userId );
1160                                         $edits = $user->getEditCount();
1161                                 }
1162                                 if ( $edits === 0 ) {
1163                                         $attribs['class'] = 'new';
1164                                 }
1165                         }
1166                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1167
1168                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1169                 }
1170                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1171                         $items[] = self::blockLink( $userId, $userText );
1172                 }
1173
1174                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1175                         $items[] = self::emailLink( $userId, $userText );
1176                 }
1177
1178                 wfRunHooks( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
1179
1180                 if ( $items ) {
1181                         return wfMessage( 'word-separator' )->plain()
1182                                 . '<span class="mw-usertoollinks">'
1183                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1184                                 . '</span>';
1185                 } else {
1186                         return '';
1187                 }
1188         }
1189
1190         /**
1191          * Alias for userToolLinks( $userId, $userText, true );
1192          * @param int $userId User identifier
1193          * @param string $userText User name or IP address
1194          * @param int $edits User edit count (optional, for performance)
1195          * @return string
1196          */
1197         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1198                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1199         }
1200
1201         /**
1202          * @param int $userId User id in database.
1203          * @param string $userText User name in database.
1204          * @return string HTML fragment with user talk link
1205          */
1206         public static function userTalkLink( $userId, $userText ) {
1207                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1208                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1209                 return $userTalkLink;
1210         }
1211
1212         /**
1213          * @param int $userId Userid
1214          * @param string $userText User name in database.
1215          * @return string HTML fragment with block link
1216          */
1217         public static function blockLink( $userId, $userText ) {
1218                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1219                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1220                 return $blockLink;
1221         }
1222
1223         /**
1224          * @param int $userId Userid
1225          * @param string $userText User name in database.
1226          * @return string HTML fragment with e-mail user link
1227          */
1228         public static function emailLink( $userId, $userText ) {
1229                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1230                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1231                 return $emailLink;
1232         }
1233
1234         /**
1235          * Generate a user link if the current user is allowed to view it
1236          * @param Revision $rev
1237          * @param bool $isPublic Show only if all users can see it
1238          * @return string HTML fragment
1239          */
1240         public static function revUserLink( $rev, $isPublic = false ) {
1241                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1242                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1243                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1244                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1245                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1246                 } else {
1247                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1248                 }
1249                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1250                         return '<span class="history-deleted">' . $link . '</span>';
1251                 }
1252                 return $link;
1253         }
1254
1255         /**
1256          * Generate a user tool link cluster if the current user is allowed to view it
1257          * @param Revision $rev
1258          * @param bool $isPublic Show only if all users can see it
1259          * @return string HTML
1260          */
1261         public static function revUserTools( $rev, $isPublic = false ) {
1262                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1263                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1264                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1265                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1266                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1267                         $link = self::userLink( $userId, $userText )
1268                                 . wfMessage( 'word-separator' )->plain()
1269                                 . self::userToolLinks( $userId, $userText );
1270                 } else {
1271                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1272                 }
1273                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1274                         return ' <span class="history-deleted">' . $link . '</span>';
1275                 }
1276                 return $link;
1277         }
1278
1279         /**
1280          * This function is called by all recent changes variants, by the page history,
1281          * and by the user contributions list. It is responsible for formatting edit
1282          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1283          * auto-generated comments (from section editing) and formats [[wikilinks]].
1284          *
1285          * @author Erik Moeller <moeller@scireview.de>
1286          *
1287          * Note: there's not always a title to pass to this function.
1288          * Since you can't set a default parameter for a reference, I've turned it
1289          * temporarily to a value pass. Should be adjusted further. --brion
1290          *
1291          * @param string $comment
1292          * @param Title|null $title Title object (to generate link to the section in autocomment) or null
1293          * @param bool $local Whether section links should refer to local page
1294          * @return mixed|string
1295          */
1296         public static function formatComment( $comment, $title = null, $local = false ) {
1297                 wfProfileIn( __METHOD__ );
1298
1299                 # Sanitize text a bit:
1300                 $comment = str_replace( "\n", " ", $comment );
1301                 # Allow HTML entities (for bug 13815)
1302                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1303
1304                 # Render autocomments and make links:
1305                 $comment = self::formatAutocomments( $comment, $title, $local );
1306                 $comment = self::formatLinksInComment( $comment, $title, $local );
1307
1308                 wfProfileOut( __METHOD__ );
1309                 return $comment;
1310         }
1311
1312         /**
1313          * Converts autogenerated comments in edit summaries into section links.
1314          * The pattern for autogen comments is / * foo * /, which makes for
1315          * some nasty regex.
1316          * We look for all comments, match any text before and after the comment,
1317          * add a separator where needed and format the comment itself with CSS
1318          * Called by Linker::formatComment.
1319          *
1320          * @param string $comment Comment text
1321          * @param Title|null $title An optional title object used to links to sections
1322          * @param bool $local Whether section links should refer to local page
1323          * @return string Formatted comment
1324          */
1325         private static function formatAutocomments( $comment, $title = null, $local = false ) {
1326                 return preg_replace_callback(
1327                         '!(.*)/\*\s*(.*?)\s*\*/(.*)!',
1328                         function ( $match ) use ( $title, $local ) {
1329                                 global $wgLang;
1330
1331                                 $pre = $match[1];
1332                                 $auto = $match[2];
1333                                 $post = $match[3];
1334                                 $comment = null;
1335                                 wfRunHooks( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local ) );
1336                                 if ( $comment === null ) {
1337                                         $link = '';
1338                                         if ( $title ) {
1339                                                 $section = $auto;
1340                                                 # Remove links that a user may have manually put in the autosummary
1341                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1342                                                 $section = str_replace( '[[:', '', $section );
1343                                                 $section = str_replace( '[[', '', $section );
1344                                                 $section = str_replace( ']]', '', $section );
1345
1346                                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1347                                                 if ( $local ) {
1348                                                         $sectionTitle = Title::newFromText( '#' . $section );
1349                                                 } else {
1350                                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1351                                                                 $title->getDBkey(), $section );
1352                                                 }
1353                                                 if ( $sectionTitle ) {
1354                                                         $link = Linker::link( $sectionTitle,
1355                                                                 $wgLang->getArrow(), array(), array(),
1356                                                                 'noclasses' );
1357                                                 } else {
1358                                                         $link = '';
1359                                                 }
1360                                         }
1361                                         if ( $pre ) {
1362                                                 # written summary $presep autocomment (summary /* section */)
1363                                                 $pre .= wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1364                                         }
1365                                         if ( $post ) {
1366                                                 # autocomment $postsep written summary (/* section */ summary)
1367                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1368                                         }
1369                                         $auto = '<span class="autocomment">' . $auto . '</span>';
1370                                         $comment = $pre . $link . $wgLang->getDirMark()
1371                                                 . '<span dir="auto">' . $auto . $post . '</span>';
1372                                 }
1373                                 return $comment;
1374                         },
1375                         $comment
1376                 );
1377         }
1378
1379         /**
1380          * Formats wiki links and media links in text; all other wiki formatting
1381          * is ignored
1382          *
1383          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1384          * @param string $comment Text to format links in
1385          * @param Title|null $title An optional title object used to links to sections
1386          * @param bool $local Whether section links should refer to local page
1387          * @return string
1388          */
1389         public static function formatLinksInComment( $comment, $title = null, $local = false ) {
1390                 return preg_replace_callback(
1391                         '/
1392                                 \[\[
1393                                 :? # ignore optional leading colon
1394                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1395                                 (?:\|
1396                                         # 2. a pipe-separated substring; only the last is captured
1397                                         # Stop matching at | and ]] without relying on backtracking.
1398                                         ((?:]?[^\]|])*+)
1399                                 )*
1400                                 \]\]
1401                                 ([^[]*) # 3. link trail (the text up until the next link)
1402                         /x',
1403                         function ( $match ) use ( $title, $local ) {
1404                                 global $wgContLang;
1405
1406                                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1407                                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1408
1409                                 $comment = $match[0];
1410
1411                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1412                                 if ( strpos( $match[1], '%' ) !== false ) {
1413                                         $match[1] = str_replace(
1414                                                 array( '<', '>' ),
1415                                                 array( '&lt;', '&gt;' ),
1416                                                 rawurldecode( $match[1] )
1417                                         );
1418                                 }
1419
1420                                 # Handle link renaming [[foo|text]] will show link as "text"
1421                                 if ( $match[2] != "" ) {
1422                                         $text = $match[2];
1423                                 } else {
1424                                         $text = $match[1];
1425                                 }
1426                                 $submatch = array();
1427                                 $thelink = null;
1428                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1429                                         # Media link; trail not supported.
1430                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1431                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1432                                         if ( $title ) {
1433                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1434                                         }
1435                                 } else {
1436                                         # Other kind of link
1437                                         if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
1438                                                 $trail = $submatch[1];
1439                                         } else {
1440                                                 $trail = "";
1441                                         }
1442                                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1443                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1444                                                 $match[1] = substr( $match[1], 1 );
1445                                         }
1446                                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1447
1448                                         $linkText = $text;
1449                                         $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1450
1451                                         $target = Title::newFromText( $linkTarget );
1452                                         if ( $target ) {
1453                                                 if ( $target->getText() == '' && !$target->isExternal()
1454                                                         && !$local && $title
1455                                                 ) {
1456                                                         $newTarget = clone ( $title );
1457                                                         $newTarget->setFragment( '#' . $target->getFragment() );
1458                                                         $target = $newTarget;
1459                                                 }
1460                                                 $thelink = Linker::link(
1461                                                         $target,
1462                                                         $linkText . $inside
1463                                                 ) . $trail;
1464                                         }
1465                                 }
1466                                 if ( $thelink ) {
1467                                         // If the link is still valid, go ahead and replace it in!
1468                                         $comment = preg_replace(
1469                                                 $linkRegexp,
1470                                                 StringUtils::escapeRegexReplacement( $thelink ),
1471                                                 $comment,
1472                                                 1
1473                                         );
1474                                 }
1475
1476                                 return $comment;
1477                         },
1478                         $comment
1479                 );
1480         }
1481
1482         /**
1483          * @param Title $contextTitle
1484          * @param string $target
1485          * @param string $text
1486          * @return string
1487          */
1488         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1489                 # Valid link forms:
1490                 # Foobar -- normal
1491                 # :Foobar -- override special treatment of prefix (images, language links)
1492                 # /Foobar -- convert to CurrentPage/Foobar
1493                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1494                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1495                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1496
1497                 wfProfileIn( __METHOD__ );
1498                 $ret = $target; # default return value is no change
1499
1500                 # Some namespaces don't allow subpages,
1501                 # so only perform processing if subpages are allowed
1502                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1503                         $hash = strpos( $target, '#' );
1504                         if ( $hash !== false ) {
1505                                 $suffix = substr( $target, $hash );
1506                                 $target = substr( $target, 0, $hash );
1507                         } else {
1508                                 $suffix = '';
1509                         }
1510                         # bug 7425
1511                         $target = trim( $target );
1512                         # Look at the first character
1513                         if ( $target != '' && $target[0] === '/' ) {
1514                                 # / at end means we don't want the slash to be shown
1515                                 $m = array();
1516                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1517                                 if ( $trailingSlashes ) {
1518                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1519                                 } else {
1520                                         $noslash = substr( $target, 1 );
1521                                 }
1522
1523                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1524                                 if ( $text === '' ) {
1525                                         $text = $target . $suffix;
1526                                 } # this might be changed for ugliness reasons
1527                         } else {
1528                                 # check for .. subpage backlinks
1529                                 $dotdotcount = 0;
1530                                 $nodotdot = $target;
1531                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1532                                         ++$dotdotcount;
1533                                         $nodotdot = substr( $nodotdot, 3 );
1534                                 }
1535                                 if ( $dotdotcount > 0 ) {
1536                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1537                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1538                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1539                                                 # / at the end means don't show full path
1540                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1541                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1542                                                         if ( $text === '' ) {
1543                                                                 $text = $nodotdot . $suffix;
1544                                                         }
1545                                                 }
1546                                                 $nodotdot = trim( $nodotdot );
1547                                                 if ( $nodotdot != '' ) {
1548                                                         $ret .= '/' . $nodotdot;
1549                                                 }
1550                                                 $ret .= $suffix;
1551                                         }
1552                                 }
1553                         }
1554                 }
1555
1556                 wfProfileOut( __METHOD__ );
1557                 return $ret;
1558         }
1559
1560         /**
1561          * Wrap a comment in standard punctuation and formatting if
1562          * it's non-empty, otherwise return empty string.
1563          *
1564          * @param string $comment
1565          * @param Title|null $title Title object (to generate link to section in autocomment) or null
1566          * @param bool $local Whether section links should refer to local page
1567          *
1568          * @return string
1569          */
1570         public static function commentBlock( $comment, $title = null, $local = false ) {
1571                 // '*' used to be the comment inserted by the software way back
1572                 // in antiquity in case none was provided, here for backwards
1573                 // compatibility, acc. to brion -ævar
1574                 if ( $comment == '' || $comment == '*' ) {
1575                         return '';
1576                 } else {
1577                         $formatted = self::formatComment( $comment, $title, $local );
1578                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1579                         return " <span class=\"comment\">$formatted</span>";
1580                 }
1581         }
1582
1583         /**
1584          * Wrap and format the given revision's comment block, if the current
1585          * user is allowed to view it.
1586          *
1587          * @param Revision $rev
1588          * @param bool $local Whether section links should refer to local page
1589          * @param bool $isPublic Show only if all users can see it
1590          * @return string HTML fragment
1591          */
1592         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1593                 if ( $rev->getRawComment() == "" ) {
1594                         return "";
1595                 }
1596                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1597                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1598                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1599                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1600                                 $rev->getTitle(), $local );
1601                 } else {
1602                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1603                 }
1604                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1605                         return " <span class=\"history-deleted\">$block</span>";
1606                 }
1607                 return $block;
1608         }
1609
1610         /**
1611          * @param int $size
1612          * @return string
1613          */
1614         public static function formatRevisionSize( $size ) {
1615                 if ( $size == 0 ) {
1616                         $stxt = wfMessage( 'historyempty' )->escaped();
1617                 } else {
1618                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1619                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1620                 }
1621                 return "<span class=\"history-size\">$stxt</span>";
1622         }
1623
1624         /**
1625          * Add another level to the Table of Contents
1626          *
1627          * @return string
1628          */
1629         public static function tocIndent() {
1630                 return "\n<ul>";
1631         }
1632
1633         /**
1634          * Finish one or more sublevels on the Table of Contents
1635          *
1636          * @param int $level
1637          * @return string
1638          */
1639         public static function tocUnindent( $level ) {
1640                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1641         }
1642
1643         /**
1644          * parameter level defines if we are on an indentation level
1645          *
1646          * @param string $anchor
1647          * @param string $tocline
1648          * @param string $tocnumber
1649          * @param string $level
1650          * @param string|bool $sectionIndex
1651          * @return string
1652          */
1653         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1654                 $classes = "toclevel-$level";
1655                 if ( $sectionIndex !== false ) {
1656                         $classes .= " tocsection-$sectionIndex";
1657                 }
1658                 return "\n<li class=\"$classes\"><a href=\"#" .
1659                         $anchor . '"><span class="tocnumber">' .
1660                         $tocnumber . '</span> <span class="toctext">' .
1661                         $tocline . '</span></a>';
1662         }
1663
1664         /**
1665          * End a Table Of Contents line.
1666          * tocUnindent() will be used instead if we're ending a line below
1667          * the new level.
1668          * @return string
1669          */
1670         public static function tocLineEnd() {
1671                 return "</li>\n";
1672         }
1673
1674         /**
1675          * Wraps the TOC in a table and provides the hide/collapse javascript.
1676          *
1677          * @param string $toc Html of the Table Of Contents
1678          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1679          * @return string Full html of the TOC
1680          */
1681         public static function tocList( $toc, $lang = false ) {
1682                 $lang = wfGetLangObj( $lang );
1683                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1684
1685                 return '<div id="toc" class="toc">'
1686                         . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1687                         . $toc
1688                         . "</ul>\n</div>\n";
1689         }
1690
1691         /**
1692          * Generate a table of contents from a section tree
1693          * Currently unused.
1694          *
1695          * @param array $tree Return value of ParserOutput::getSections()
1696          * @return string HTML fragment
1697          */
1698         public static function generateTOC( $tree ) {
1699                 $toc = '';
1700                 $lastLevel = 0;
1701                 foreach ( $tree as $section ) {
1702                         if ( $section['toclevel'] > $lastLevel ) {
1703                                 $toc .= self::tocIndent();
1704                         } elseif ( $section['toclevel'] < $lastLevel ) {
1705                                 $toc .= self::tocUnindent(
1706                                         $lastLevel - $section['toclevel'] );
1707                         } else {
1708                                 $toc .= self::tocLineEnd();
1709                         }
1710
1711                         $toc .= self::tocLine( $section['anchor'],
1712                                 $section['line'], $section['number'],
1713                                 $section['toclevel'], $section['index'] );
1714                         $lastLevel = $section['toclevel'];
1715                 }
1716                 $toc .= self::tocLineEnd();
1717                 return self::tocList( $toc );
1718         }
1719
1720         /**
1721          * Create a headline for content
1722          *
1723          * @param int $level The level of the headline (1-6)
1724          * @param string $attribs Any attributes for the headline, starting with
1725          *   a space and ending with '>'
1726          *   This *must* be at least '>' for no attribs
1727          * @param string $anchor The anchor to give the headline (the bit after the #)
1728          * @param string $html Html for the text of the header
1729          * @param string $link HTML to add for the section edit link
1730          * @param bool|string $legacyAnchor A second, optional anchor to give for
1731          *   backward compatibility (false to omit)
1732          *
1733          * @return string HTML headline
1734          */
1735         public static function makeHeadline( $level, $attribs, $anchor, $html,
1736                 $link, $legacyAnchor = false
1737         ) {
1738                 $ret = "<h$level$attribs"
1739                         . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1740                         . $link
1741                         . "</h$level>";
1742                 if ( $legacyAnchor !== false ) {
1743                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1744                 }
1745                 return $ret;
1746         }
1747
1748         /**
1749          * Split a link trail, return the "inside" portion and the remainder of the trail
1750          * as a two-element array
1751          * @param string $trail
1752          * @return array
1753          */
1754         static function splitTrail( $trail ) {
1755                 global $wgContLang;
1756                 $regex = $wgContLang->linkTrail();
1757                 $inside = '';
1758                 if ( $trail !== '' ) {
1759                         $m = array();
1760                         if ( preg_match( $regex, $trail, $m ) ) {
1761                                 $inside = $m[1];
1762                                 $trail = $m[2];
1763                         }
1764                 }
1765                 return array( $inside, $trail );
1766         }
1767
1768         /**
1769          * Generate a rollback link for a given revision.  Currently it's the
1770          * caller's responsibility to ensure that the revision is the top one. If
1771          * it's not, of course, the user will get an error message.
1772          *
1773          * If the calling page is called with the parameter &bot=1, all rollback
1774          * links also get that parameter. It causes the edit itself and the rollback
1775          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1776          * changes, so this allows sysops to combat a busy vandal without bothering
1777          * other users.
1778          *
1779          * If the option verify is set this function will return the link only in case the
1780          * revision can be reverted. Please note that due to performance limitations
1781          * it might be assumed that a user isn't the only contributor of a page while
1782          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1783          * work if $wgShowRollbackEditCount is disabled, so this can only function
1784          * as an additional check.
1785          *
1786          * If the option noBrackets is set the rollback link wont be enclosed in []
1787          *
1788          * @param Revision $rev
1789          * @param IContextSource $context Context to use or null for the main context.
1790          * @param array $options
1791          * @return string
1792          */
1793         public static function generateRollback( $rev, IContextSource $context = null,
1794                 $options = array( 'verify' )
1795         ) {
1796                 if ( $context === null ) {
1797                         $context = RequestContext::getMain();
1798                 }
1799
1800                 $editCount = false;
1801                 if ( in_array( 'verify', $options ) ) {
1802                         $editCount = self::getRollbackEditCount( $rev, true );
1803                         if ( $editCount === false ) {
1804                                 return '';
1805                         }
1806                 }
1807
1808                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1809
1810                 if ( !in_array( 'noBrackets', $options ) ) {
1811                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->plain();
1812                 }
1813
1814                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1815         }
1816
1817         /**
1818          * This function will return the number of revisions which a rollback
1819          * would revert and, if $verify is set it will verify that a revision
1820          * can be reverted (that the user isn't the only contributor and the
1821          * revision we might rollback to isn't deleted). These checks can only
1822          * function as an additional check as this function only checks against
1823          * the last $wgShowRollbackEditCount edits.
1824          *
1825          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1826          * is set and the user is the only contributor of the page.
1827          *
1828          * @param Revision $rev
1829          * @param bool $verify Try to verify that this revision can really be rolled back
1830          * @return int|bool|null
1831          */
1832         public static function getRollbackEditCount( $rev, $verify ) {
1833                 global $wgShowRollbackEditCount;
1834                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1835                         // Nothing has happened, indicate this by returning 'null'
1836                         return null;
1837                 }
1838
1839                 $dbr = wfGetDB( DB_SLAVE );
1840
1841                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1842                 $res = $dbr->select(
1843                         'revision',
1844                         array( 'rev_user_text', 'rev_deleted' ),
1845                         // $rev->getPage() returns null sometimes
1846                         array( 'rev_page' => $rev->getTitle()->getArticleID() ),
1847                         __METHOD__,
1848                         array(
1849                                 'USE INDEX' => array( 'revision' => 'page_timestamp' ),
1850                                 'ORDER BY' => 'rev_timestamp DESC',
1851                                 'LIMIT' => $wgShowRollbackEditCount + 1
1852                         )
1853                 );
1854
1855                 $editCount = 0;
1856                 $moreRevs = false;
1857                 foreach ( $res as $row ) {
1858                         if ( $rev->getRawUserText() != $row->rev_user_text ) {
1859                                 if ( $verify &&
1860                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1861                                                 || $row->rev_deleted & Revision::DELETED_USER
1862                                 ) ) {
1863                                         // If the user or the text of the revision we might rollback
1864                                         // to is deleted in some way we can't rollback. Similar to
1865                                         // the sanity checks in WikiPage::commitRollback.
1866                                         return false;
1867                                 }
1868                                 $moreRevs = true;
1869                                 break;
1870                         }
1871                         $editCount++;
1872                 }
1873
1874                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1875                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1876                         // and there weren't any other revisions. That means that the current user is the only
1877                         // editor, so we can't rollback
1878                         return false;
1879                 }
1880                 return $editCount;
1881         }
1882
1883         /**
1884          * Build a raw rollback link, useful for collections of "tool" links
1885          *
1886          * @param Revision $rev
1887          * @param IContextSource|null $context Context to use or null for the main context.
1888          * @param int $editCount Number of edits that would be reverted
1889          * @return string HTML fragment
1890          */
1891         public static function buildRollbackLink( $rev, IContextSource $context = null,
1892                 $editCount = false
1893         ) {
1894                 global $wgShowRollbackEditCount, $wgMiserMode;
1895
1896                 // To config which pages are effected by miser mode
1897                 $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );
1898
1899                 if ( $context === null ) {
1900                         $context = RequestContext::getMain();
1901                 }
1902
1903                 $title = $rev->getTitle();
1904                 $query = array(
1905                         'action' => 'rollback',
1906                         'from' => $rev->getUserText(),
1907                         'token' => $context->getUser()->getEditToken( array(
1908                                 $title->getPrefixedText(),
1909                                 $rev->getUserText()
1910                         ) ),
1911                 );
1912                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1913                         $query['bot'] = '1';
1914                         $query['hidediff'] = '1'; // bug 15999
1915                 }
1916
1917                 $disableRollbackEditCount = false;
1918                 if ( $wgMiserMode ) {
1919                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1920                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1921                                         $disableRollbackEditCount = true;
1922                                         break;
1923                                 }
1924                         }
1925                 }
1926
1927                 if ( !$disableRollbackEditCount
1928                         && is_int( $wgShowRollbackEditCount )
1929                         && $wgShowRollbackEditCount > 0
1930                 ) {
1931                         if ( !is_numeric( $editCount ) ) {
1932                                 $editCount = self::getRollbackEditCount( $rev, false );
1933                         }
1934
1935                         if ( $editCount > $wgShowRollbackEditCount ) {
1936                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
1937                                         ->numParams( $wgShowRollbackEditCount )->parse();
1938                         } else {
1939                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1940                         }
1941
1942                         return self::link(
1943                                 $title,
1944                                 $editCount_output,
1945                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1946                                 $query,
1947                                 array( 'known', 'noclasses' )
1948                         );
1949                 } else {
1950                         return self::link(
1951                                 $title,
1952                                 $context->msg( 'rollbacklink' )->escaped(),
1953                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1954                                 $query,
1955                                 array( 'known', 'noclasses' )
1956                         );
1957                 }
1958         }
1959
1960         /**
1961          * Returns HTML for the "templates used on this page" list.
1962          *
1963          * Make an HTML list of templates, and then add a "More..." link at
1964          * the bottom. If $more is null, do not add a "More..." link. If $more
1965          * is a Title, make a link to that title and use it. If $more is a string,
1966          * directly paste it in as the link (escaping needs to be done manually).
1967          * Finally, if $more is a Message, call toString().
1968          *
1969          * @param array $templates Array of templates from Article::getUsedTemplate or similar
1970          * @param bool $preview Whether this is for a preview
1971          * @param bool $section Whether this is for a section edit
1972          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
1973          * @return string HTML output
1974          */
1975         public static function formatTemplates( $templates, $preview = false,
1976                 $section = false, $more = null
1977         ) {
1978                 global $wgLang;
1979                 wfProfileIn( __METHOD__ );
1980
1981                 $outText = '';
1982                 if ( count( $templates ) > 0 ) {
1983                         # Do a batch existence check
1984                         $batch = new LinkBatch;
1985                         foreach ( $templates as $title ) {
1986                                 $batch->addObj( $title );
1987                         }
1988                         $batch->execute();
1989
1990                         # Construct the HTML
1991                         $outText = '<div class="mw-templatesUsedExplanation">';
1992                         if ( $preview ) {
1993                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
1994                                         ->parseAsBlock();
1995                         } elseif ( $section ) {
1996                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
1997                                         ->parseAsBlock();
1998                         } else {
1999                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
2000                                         ->parseAsBlock();
2001                         }
2002                         $outText .= "</div><ul>\n";
2003
2004                         usort( $templates, 'Title::compare' );
2005                         foreach ( $templates as $titleObj ) {
2006                                 $protected = '';
2007                                 $restrictions = $titleObj->getRestrictions( 'edit' );
2008                                 if ( $restrictions ) {
2009                                         // Check backwards-compatible messages
2010                                         $msg = null;
2011                                         if ( $restrictions === array( 'sysop' ) ) {
2012                                                 $msg = wfMessage( 'template-protected' );
2013                                         } elseif ( $restrictions === array( 'autoconfirmed' ) ) {
2014                                                 $msg = wfMessage( 'template-semiprotected' );
2015                                         }
2016                                         if ( $msg && !$msg->isDisabled() ) {
2017                                                 $protected = $msg->parse();
2018                                         } else {
2019                                                 // Construct the message from restriction-level-*
2020                                                 // e.g. restriction-level-sysop, restriction-level-autoconfirmed
2021                                                 $msgs = array();
2022                                                 foreach ( $restrictions as $r ) {
2023                                                         $msgs[] = wfMessage( "restriction-level-$r" )->parse();
2024                                                 }
2025                                                 $protected = wfMessage( 'parentheses' )
2026                                                         ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
2027                                         }
2028                                 }
2029                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
2030                                         $editLink = self::link(
2031                                                 $titleObj,
2032                                                 wfMessage( 'editlink' )->text(),
2033                                                 array(),
2034                                                 array( 'action' => 'edit' )
2035                                         );
2036                                 } else {
2037                                         $editLink = self::link(
2038                                                 $titleObj,
2039                                                 wfMessage( 'viewsourcelink' )->text(),
2040                                                 array(),
2041                                                 array( 'action' => 'edit' )
2042                                         );
2043                                 }
2044                                 $outText .= '<li>' . self::link( $titleObj )
2045                                         . wfMessage( 'word-separator' )->escaped()
2046                                         . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
2047                                         . wfMessage( 'word-separator' )->escaped()
2048                                         . $protected . '</li>';
2049                         }
2050
2051                         if ( $more instanceof Title ) {
2052                                 $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
2053                         } elseif ( $more ) {
2054                                 $outText .= "<li>$more</li>";
2055                         }
2056
2057                         $outText .= '</ul>';
2058                 }
2059                 wfProfileOut( __METHOD__ );
2060                 return $outText;
2061         }
2062
2063         /**
2064          * Returns HTML for the "hidden categories on this page" list.
2065          *
2066          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
2067          *   or similar
2068          * @return string HTML output
2069          */
2070         public static function formatHiddenCategories( $hiddencats ) {
2071                 wfProfileIn( __METHOD__ );
2072
2073                 $outText = '';
2074                 if ( count( $hiddencats ) > 0 ) {
2075                         # Construct the HTML
2076                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
2077                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
2078                         $outText .= "</div><ul>\n";
2079
2080                         foreach ( $hiddencats as $titleObj ) {
2081                                 # If it's hidden, it must exist - no need to check with a LinkBatch
2082                                 $outText .= '<li>'
2083                                         . self::link( $titleObj, null, array(), array(), 'known' )
2084                                         . "</li>\n";
2085                         }
2086                         $outText .= '</ul>';
2087                 }
2088                 wfProfileOut( __METHOD__ );
2089                 return $outText;
2090         }
2091
2092         /**
2093          * Format a size in bytes for output, using an appropriate
2094          * unit (B, KB, MB or GB) according to the magnitude in question
2095          *
2096          * @param int $size Size to format
2097          * @return string
2098          */
2099         public static function formatSize( $size ) {
2100                 global $wgLang;
2101                 return htmlspecialchars( $wgLang->formatSize( $size ) );
2102         }
2103
2104         /**
2105          * Given the id of an interface element, constructs the appropriate title
2106          * attribute from the system messages.  (Note, this is usually the id but
2107          * isn't always, because sometimes the accesskey needs to go on a different
2108          * element than the id, for reverse-compatibility, etc.)
2109          *
2110          * @param string $name Id of the element, minus prefixes.
2111          * @param string|null $options Null or the string 'withaccess' to add an access-
2112          *   key hint
2113          * @return string Contents of the title attribute (which you must HTML-
2114          *   escape), or false for no title attribute
2115          */
2116         public static function titleAttrib( $name, $options = null ) {
2117                 wfProfileIn( __METHOD__ );
2118
2119                 $message = wfMessage( "tooltip-$name" );
2120
2121                 if ( !$message->exists() ) {
2122                         $tooltip = false;
2123                 } else {
2124                         $tooltip = $message->text();
2125                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2126                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2127                         # Message equal to '-' means suppress it.
2128                         if ( $tooltip == '-' ) {
2129                                 $tooltip = false;
2130                         }
2131                 }
2132
2133                 if ( $options == 'withaccess' ) {
2134                         $accesskey = self::accesskey( $name );
2135                         if ( $accesskey !== false ) {
2136                                 // Should be build the same as in jquery.accessKeyLabel.js
2137                                 if ( $tooltip === false || $tooltip === '' ) {
2138                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2139                                 } else {
2140                                         $tooltip .= wfMessage( 'word-separator' )->text();
2141                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2142                                 }
2143                         }
2144                 }
2145
2146                 wfProfileOut( __METHOD__ );
2147                 return $tooltip;
2148         }
2149
2150         public static $accesskeycache;
2151
2152         /**
2153          * Given the id of an interface element, constructs the appropriate
2154          * accesskey attribute from the system messages.  (Note, this is usually
2155          * the id but isn't always, because sometimes the accesskey needs to go on
2156          * a different element than the id, for reverse-compatibility, etc.)
2157          *
2158          * @param string $name Id of the element, minus prefixes.
2159          * @return string Contents of the accesskey attribute (which you must HTML-
2160          *   escape), or false for no accesskey attribute
2161          */
2162         public static function accesskey( $name ) {
2163                 if ( isset( self::$accesskeycache[$name] ) ) {
2164                         return self::$accesskeycache[$name];
2165                 }
2166                 wfProfileIn( __METHOD__ );
2167
2168                 $message = wfMessage( "accesskey-$name" );
2169
2170                 if ( !$message->exists() ) {
2171                         $accesskey = false;
2172                 } else {
2173                         $accesskey = $message->plain();
2174                         if ( $accesskey === '' || $accesskey === '-' ) {
2175                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2176                                 # attribute, but this is broken for accesskey: that might be a useful
2177                                 # value.
2178                                 $accesskey = false;
2179                         }
2180                 }
2181
2182                 wfProfileOut( __METHOD__ );
2183                 self::$accesskeycache[$name] = $accesskey;
2184                 return self::$accesskeycache[$name];
2185         }
2186
2187         /**
2188          * Get a revision-deletion link, or disabled link, or nothing, depending
2189          * on user permissions & the settings on the revision.
2190          *
2191          * Will use forward-compatible revision ID in the Special:RevDelete link
2192          * if possible, otherwise the timestamp-based ID which may break after
2193          * undeletion.
2194          *
2195          * @param User $user
2196          * @param Revision $rev
2197          * @param Title $title
2198          * @return string HTML fragment
2199          */
2200         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2201                 $canHide = $user->isAllowed( 'deleterevision' );
2202                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2203                         return '';
2204                 }
2205
2206                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2207                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2208                 } else {
2209                         if ( $rev->getId() ) {
2210                                 // RevDelete links using revision ID are stable across
2211                                 // page deletion and undeletion; use when possible.
2212                                 $query = array(
2213                                         'type' => 'revision',
2214                                         'target' => $title->getPrefixedDBkey(),
2215                                         'ids' => $rev->getId()
2216                                 );
2217                         } else {
2218                                 // Older deleted entries didn't save a revision ID.
2219                                 // We have to refer to these by timestamp, ick!
2220                                 $query = array(
2221                                         'type' => 'archive',
2222                                         'target' => $title->getPrefixedDBkey(),
2223                                         'ids' => $rev->getTimestamp()
2224                                 );
2225                         }
2226                         return Linker::revDeleteLink( $query,
2227                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2228                 }
2229         }
2230
2231         /**
2232          * Creates a (show/hide) link for deleting revisions/log entries
2233          *
2234          * @param array $query Query parameters to be passed to link()
2235          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2236          * @param bool $delete Set to true to use (show/hide) rather than (show)
2237          *
2238          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2239          * span to allow for customization of appearance with CSS
2240          */
2241         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
2242                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2243                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2244                 $html = wfMessage( $msgKey )->escaped();
2245                 $tag = $restricted ? 'strong' : 'span';
2246                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
2247                 return Xml::tags(
2248                         $tag,
2249                         array( 'class' => 'mw-revdelundel-link' ),
2250                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2251                 );
2252         }
2253
2254         /**
2255          * Creates a dead (show/hide) link for deleting revisions/log entries
2256          *
2257          * @param bool $delete Set to true to use (show/hide) rather than (show)
2258          *
2259          * @return string HTML text wrapped in a span to allow for customization
2260          * of appearance with CSS
2261          */
2262         public static function revDeleteLinkDisabled( $delete = true ) {
2263                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2264                 $html = wfMessage( $msgKey )->escaped();
2265                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2266                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
2267         }
2268
2269         /* Deprecated methods */
2270
2271         /**
2272          * @deprecated since 1.16 Use link(); warnings since 1.21
2273          *
2274          * Make a link for a title which may or may not be in the database. If you need to
2275          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
2276          * call to this will result in a DB query.
2277          *
2278          * @param Title $nt The title object to make the link from, e.g. from Title::newFromText.
2279          * @param string $text Link text
2280          * @param string $query Optional query part
2281          * @param string $trail Optional trail. Alphabetic characters at the start of this string will
2282          *   be included in the link text. Other characters will be appended after
2283          *   the end of the link.
2284          * @param string $prefix Optional prefix. As trail, only before instead of after.
2285          * @return string
2286          */
2287         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2288                 wfDeprecated( __METHOD__, '1.21' );
2289
2290                 wfProfileIn( __METHOD__ );
2291                 $query = wfCgiToArray( $query );
2292                 list( $inside, $trail ) = self::splitTrail( $trail );
2293                 if ( $text === '' ) {
2294                         $text = self::linkText( $nt );
2295                 }
2296
2297                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
2298
2299                 wfProfileOut( __METHOD__ );
2300                 return $ret;
2301         }
2302
2303         /**
2304          * @deprecated since 1.16 Use link(); warnings since 1.21
2305          *
2306          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
2307          * it doesn't have to do a database query. It's also valid for interwiki titles and special
2308          * pages.
2309          *
2310          * @param Title $title Title object of target page
2311          * @param string $text Text to replace the title
2312          * @param string $query Link target
2313          * @param string $trail Text after link
2314          * @param string $prefix Text before link text
2315          * @param string $aprops Extra attributes to the a-element
2316          * @param string $style Style to apply - if empty, use getInternalLinkAttributesObj instead
2317          * @return string The a-element
2318          */
2319         static function makeKnownLinkObj(
2320                 $title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
2321         ) {
2322                 wfDeprecated( __METHOD__, '1.21' );
2323
2324                 wfProfileIn( __METHOD__ );
2325
2326                 if ( $text == '' ) {
2327                         $text = self::linkText( $title );
2328                 }
2329                 $attribs = Sanitizer::mergeAttributes(
2330                         Sanitizer::decodeTagAttributes( $aprops ),
2331                         Sanitizer::decodeTagAttributes( $style )
2332                 );
2333                 $query = wfCgiToArray( $query );
2334                 list( $inside, $trail ) = self::splitTrail( $trail );
2335
2336                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
2337                         array( 'known', 'noclasses' ) ) . $trail;
2338
2339                 wfProfileOut( __METHOD__ );
2340                 return $ret;
2341         }
2342
2343         /**
2344          * Returns the attributes for the tooltip and access key.
2345          * @param string $name
2346          * @return array
2347          */
2348         public static function tooltipAndAccesskeyAttribs( $name ) {
2349                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2350                 # no attribute" instead of "output '' as value for attribute", this
2351                 # would be three lines.
2352                 $attribs = array(
2353                         'title' => self::titleAttrib( $name, 'withaccess' ),
2354                         'accesskey' => self::accesskey( $name )
2355                 );
2356                 if ( $attribs['title'] === false ) {
2357                         unset( $attribs['title'] );
2358                 }
2359                 if ( $attribs['accesskey'] === false ) {
2360                         unset( $attribs['accesskey'] );
2361                 }
2362                 return $attribs;
2363         }
2364
2365         /**
2366          * Returns raw bits of HTML, use titleAttrib()
2367          * @param string $name
2368          * @param array|null $options
2369          * @return null|string
2370          */
2371         public static function tooltip( $name, $options = null ) {
2372                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2373                 # no attribute" instead of "output '' as value for attribute", this
2374                 # would be two lines.
2375                 $tooltip = self::titleAttrib( $name, $options );
2376                 if ( $tooltip === false ) {
2377                         return '';
2378                 }
2379                 return Xml::expandAttributes( array(
2380                         'title' => $tooltip
2381                 ) );
2382         }
2383 }
2384
2385 /**
2386  * @since 1.18
2387  */
2388 class DummyLinker {
2389
2390         /**
2391          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2392          * into static calls to the new Linker for backwards compatibility.
2393          *
2394          * @param string $fname Name of called method
2395          * @param array $args Arguments to the method
2396          * @return mixed
2397          */
2398         public function __call( $fname, $args ) {
2399                 return call_user_func_array( array( 'Linker', $fname ), $args );
2400         }
2401 }